CN108282781A - Method, terminal and the base station of data transmission in moving process - Google Patents

Abstract

The invention discloses a data transmission method, a terminal and a base station during a mobile process. The method includes: the terminal acquires key update instruction information sent by the source base station; when the terminal receives the data packet sent by the service node, according to the The above-mentioned key update instruction information is used to judge the key update; when the terminal determines that the key update is required, it updates the key of the source base station currently used to the key of the target base station, and uses the updated key to receive the key of the terminal. The received packets are decoded. The present invention assists the terminal in judging the key update through the key update indication information. The key update scheme can not only update the key of the terminal in time, but also ensure that the data transmission of the terminal is not interrupted, which is a good solution to the existing key update. The mechanism is not perfect, which affects the problem of packet decoding.

Description

Method, terminal and base station for data transmission during movement

technical field

The present invention relates to the technical field of wireless communication, in particular to a data transmission method, terminal and base station during movement.

Background technique

With the development of technology, the existing technology Long Term Evolution (LTE, Long Term Evolution) system begins to integrate with local area network (WLAN) technology to form a new networking form. It mainly consists of four devices: user equipment (UE, UserEquipment), core network (CN, Core Network), base station (eNB, Evolved Node B) and local area network terminal (WT, WLAN Termination). Among them, the mobile management in the core network An entity (MME, Mobility Management Entity) is mainly responsible for signaling transmission, and a serving gateway (SGW, Serving GetWay) is mainly responsible for data transmission. The interface between UE and eNB is Uu, the interface between eNB and core network is S1, and the interface between WT and eNB is Xw. As shown in Figure 1, it is an architecture diagram of LTE and WLAN integration.

Both the eNB and the WLAN node can provide services for the UE at the same time. As shown in Figure 2, it is a protocol architecture diagram for the integration of eNB and WLAN. Under this protocol architecture, the PDCP (Packet Data Convergence Protocol) layer of the eNB submits the encrypted data packet to the LWAAP of the WLAN through the interface Xw (LTE-WLAN AggregationAdaptation Protocol) layer, the WT is responsible for transmitting data to the UE.

In the overlapping coverage scenario of eNB and WT, as shown in Figure 3, especially when the UE moves from eNB1 to eNB2 and is always within the coverage of WT, although the UE needs to switch from eNB1 to eNB2, the UE is always in WT coverage.

In order to avoid data interruption during UE handover from eNB1 to eNB2, the WT will continue to provide services for the UE. As shown in FIG. 4 , it is a schematic diagram of a scenario in which LTE and WLAN provide services to UE during the moving process. For downlink, both eNB1 and eNB2 pass data to WT, and WT sends it to UE. For uplink, UE sends data to WT, and WT submits it to eNB1 and eNB2. Since the key used for data encryption is related to eNB, that is, the keys of eNB1 and eNB2 are different.

During data transmission, data packets will be retransmitted. For example, the data packets of eNB1 need to be retransmitted, and the retransmitted data packets will be mixed with the newly transmitted data packets. For example, the retransmitted data packets of eNB1 and The newly transmitted data packets of eNB2 are mixed together, and the UE can only use the same key at the same time, so the UE will use the wrong key to decode the data packets. If a packet fails to decode, the packet may be dropped.

Contents of the invention

The invention provides a data transmission method, a terminal and a base station in the moving process, which are used to solve the problem in the prior art that the key switching mechanism is not perfect and affects the decoding of data packets.

According to one aspect of the present invention, a method for data transmission during movement is provided, including:

The terminal obtains the key update indication information sent by the source base station;

When receiving the data packet sent by the service node, the terminal performs a key update judgment according to the key update instruction information;

When the terminal determines that a key update is needed, it updates the currently used key of the source base station to the key of the target base station, and uses the updated key to decode the data packet received by the terminal.

According to a second aspect of the present invention, a data transmission method during movement is provided, including:

When the source base station detects that the target terminal meets the conditions for switching to the target base station, it sends key update instruction information to the target base station;

The source base station sends key update instruction information to the target terminal after the target base station confirms the handover;

The source base station transmits the data packet in the cache to the target terminal through the serving node and/or forwards the cached data packet to the target base station.

According to a third aspect of the present invention, a method for data transmission during movement is provided, including:

The target base station receives the key update instruction information sent by the source base station;

After the target terminal switches into the base station from the source base station, the target base station processes the first packet sent to the target terminal according to the key update instruction information, and sends the target packet to the target terminal through the service node after processing. The terminal sends the first packet.

According to a fourth aspect of the present invention, a terminal is provided, including:

An information acquisition module, configured to acquire key update instruction information sent by the source base station;

An update judgment module, configured to perform a key update judgment according to the key update instruction information when receiving the data packet sent by the service node;

A first update processing module, configured to update the currently used key of the source base station to the key of the target base station when the update judging module determines that key updating is required;

The first data processing module is configured to use the updated key to decode the data packet received by the terminal.

According to a fifth aspect of the present invention, a source base station is provided, including:

The first information sending module is configured to send key update instruction information to the target base station when it is detected that the target terminal meets the conditions for switching to the target base station;

A second information sending module, configured to send key update instruction information to the target terminal after the target base station confirms the handover;

A data sending module, configured to transmit the data packets in the buffer to the target terminal through the serving node and/or forward the data packets in the buffer to the target base station.

According to a sixth aspect of the present invention, a target base station is provided, including:

An information receiving module, configured to receive key update instruction information sent by the source base station;

The first processing module is configured to process the first packet sent to the target terminal according to the key update instruction information after the target terminal switches into the base station from the source base station;

The first sending module is configured to send the first packet processed by the first processing module to the target terminal through the service node.

The beneficial effects of the present invention are as follows:

The present invention assists the terminal in judging the key update through the key update indication information. The key update scheme can not only update the key of the terminal in time, but also ensure that the data transmission of the terminal is not interrupted, which is a good solution to the existing key update. The mechanism is not perfect, which affects the problem of packet decoding.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the specific embodiments of the present invention are enumerated below.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is the architectural diagram of LTE and WLAN fusion in the prior art;

FIG. 2 is a protocol architecture diagram of LTE and WLAN fusion in the prior art;

FIG. 3 is a schematic diagram of scenarios of joint coverage of LTE and WLAN in the prior art;

FIG. 4 is a schematic diagram of a scenario in which LTE and WLAN provide services to UEs during mobility in the prior art;

FIG. 5 is a flowchart of a method for data transmission during movement according to the first embodiment of the present invention;

FIG. 6 is a flow chart of a method for data transmission during movement according to the second embodiment of the present invention;

FIG. 7 is a flow chart of a method for data transmission during movement according to the third embodiment of the present invention;

FIG. 8 is a schematic diagram of an application scenario of a data transmission method during movement provided by an eighth embodiment of the present invention;

FIG. 9 is a schematic diagram of an application scenario of a data transmission method during movement provided by a tenth embodiment of the present invention;

FIG. 10 is a structural block diagram of a terminal provided by an eleventh embodiment of the present invention;

FIG. 11 is a structural block diagram of a source base station provided by a twelfth embodiment of the present invention;

Fig. 12 is a structural block diagram of a target base station provided by a thirteenth embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

The embodiment of the present invention provides a data transmission method, terminal and base station during the mobile process. The present invention can not only update the key of the UE in time, but also ensure that the data of the UE is not interrupted, which solves the problems existing in the prior art. UE rekey issue. The implementation process of the present invention will be described in detail below through several specific examples.

In the first embodiment of the present invention, a method for data transmission during movement is provided. The method described in this embodiment is applied to a terminal side, and the terminal is in overlapping coverage of two eNBs and serving nodes. As shown in Figure 5, the method includes the following steps:

Step S501, the terminal obtains the key update instruction information sent by the source base station;

In a specific embodiment of the present invention, the method for the terminal to obtain the key update instruction information includes: the terminal receives the RRC reconfiguration message sent by the source base station, and extracts the key update instruction from the RRC reconfiguration message information. That is, the source base station sends the key update indication information to the terminal through an RRC reconfiguration message.

In the embodiment of the present invention, the key update instruction information is used to assist the terminal in key update judgment. In a specific embodiment, the key update instruction information is: the PDCP sequence number of the data packet used for the key update judgment Threshold information. Specifically, the threshold information of the PDCP sequence number of the data packet used for key update judgment may be, but not limited to: the PDCP sequence number information of the last data packet sent by the source base station, or the first newly transmitted data packet sent by the target base station Packet's PDCP sequence number information.

In yet another specific embodiment of the present invention, the key update indication information is: identification information carried in a data packet for indicating key update. The identification information may be but not limited to end maker.

In yet another specific embodiment of the present invention, the key update indication information is: the threshold information of the PDCP sequence number of the data packet used for key update judgment, and the key update information carried in the data packet identification information.

Step S502, when the terminal receives the data packet sent by the service node, it judges the key update according to the key update indication information;

Specifically, in the embodiment of the present invention, when the key update indication information obtained by the terminal is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the key update judgment process is specifically:

When the terminal receives the data packet sent by the service node, it detects whether the magnitude relationship between the PDCP sequence number of the received data packet and the threshold value of the PDCP sequence number of the data packet used for key update judgment meets the set standard, When it is satisfied, it is determined that the key update is required, otherwise, it is determined that the key update is not required.

In a specific embodiment of the present invention, when the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the last data packet sent by the source base station, the key update judgment is performed, It specifically includes: the terminal extracts the PDCP sequence number of the received data packet, compares the PDCP sequence number of the data packet with the PDCP sequence number of the last data packet sent by the source base station, and when the PDCP sequence number of the data packet When the sequence number is less than or equal to the PDCP sequence number of the last data packet sent by the source base station, it is determined that key update is not required; otherwise, it is determined that key update is required.

Further, when the threshold information of the PDCP sequence number of the data packet used for the key update judgment is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, the key update judgment is performed, specifically including: The terminal extracts the PDCP sequence number of the received data packet, and compares the PDCP sequence number of the data packet with the PDCP sequence number of the first newly transmitted data packet sent by the target base station, when the data packet When the PDCP sequence number of is smaller than the PDCP sequence number of the first newly transmitted data packet sent by the target base station, it is determined that key update is not required; otherwise, it is determined that key update is required.

Further, in the embodiment of the present invention, when the key update indication information obtained by the terminal is the identification information carried in the data packet for indicating the key update, the key update judgment process is specifically:

Detecting whether the identification information is carried in the packet header of the data packet, and when the identification information is carried, it is determined that a key update is required, otherwise, it is determined that a key update is not required;

Further, in the embodiment of the present invention, when the key update indication information obtained by the terminal includes the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet for indicating the key update When , the key update judgment process is as follows:

Detecting whether the size relationship between the PDCP sequence number of the data packet and the threshold value of the PDCP sequence number of the data packet used for key update judgment meets the set standard, and detecting whether the packet header of the data packet carries the Identification information, when any detection result is yes, it is determined that the key update is required, otherwise, it is determined that the key update is not required.

In step S503, when the terminal determines that a key update is required, it updates the currently used key of the source base station to the key of the target base station, and uses the updated key to decode the data packet received by the terminal.

In the embodiment of the present invention, the updated key is used to decode the data packet received by the terminal, where the received data packet includes the data packet received in step S502 and the subsequent data packet received by the terminal. That is, after the key is switched, the terminal does not perform a key update judgment, but uses the switched key to directly decode the data packet.

Further, in the embodiment of the present invention, when the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the last data packet sent by the source base station, the terminal determines that the received data packet When the PDCP sequence number of the source base station is equal to the PDCP sequence number of the last data packet sent by the source base station, it can be determined that the source base station has sent the data, and the terminal does not need to wait after decoding the data packet with the key of the source base station. When the next data packet arrives, the key is updated directly, and when the next data packet arrives, the updated key is directly used to decode the data packet.

To sum up, the embodiment of the present invention provides multiple judgment criteria for key update, and the terminal using the method described in this embodiment can perform key update judgment and key update operation according to the pre-acquired key update instruction information , which solves the problem in the prior art that a terminal uses a wrong key to decode a data packet after switching from a source base station to a target base station.

In the second embodiment of the present invention, a method for data transmission during the moving process is provided, which is applied to the source base station side, as shown in FIG. 6, and the method includes the following steps:

Step S601, when the source base station detects that the target terminal satisfies the conditions for switching to the target base station, it sends key update instruction information to the target base station;

In the embodiment of the present invention, the target terminal is in overlapping coverage of the source base station, the target base station, and the serving node.

Further, in a specific embodiment of the present invention, when the source base station sends a handover request message to the target base station, the key update instruction information is carried in the handover request message, so as to realize the delivery of the key update instruction information.

Step S602, the source base station sends key update instruction information to the target terminal after the target base station confirms the handover;

In the embodiment of the present invention, after the source base station sends the handover request message to the target base station, if it receives the handover confirmation message fed back by the target base station, it determines that the target base station confirms the handover.

In a specific embodiment of the present invention, the key update instruction information sent by the source base station to the target terminal is the key update instruction information extracted from the handover confirmation message fed back by the source base station from the target base station.

In yet another specific embodiment of the present invention, the source base station sends an RRC reconfiguration message to the target terminal, and carries the key update indication information in the RRC reconfiguration message. That is, the source base station sends the key update instruction information to the destination terminal by carrying the key update instruction information in the RRC reconfiguration message.

Step S603, the source base station transmits the buffered data packet to the target terminal through the serving node and/or forwards the buffered data packet to the target base station, so that the target base station transmits the buffered data packet to the target terminal through the serving node.

In the embodiment of the present invention, the key update indication information includes: the threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, the identifier carried in the data packet used to indicate the key update information. Specifically, the threshold information of the PDCP sequence number of the data packet used for key update judgment may be, but not limited to: the PDCP sequence number information of the last data packet sent by the source base station, or the first newly transmitted data packet sent by the target base station Packet's PDCP sequence number information. The identification information may be but not limited to end maker.

In addition, it is worth mentioning that when the types of the source base station and the target base station described in the embodiment of the present invention are both S-eNB (Second eNB, second base station), the source base station passes M-eNB (Master eNB, main base station ) sending the key update instruction information to the target base station, and sending the key update instruction information to the target terminal through the M-eNB.

To sum up, it can be seen that the source base station using the method described in this embodiment sends the key update instruction information used to assist the terminal in key update judgment to the target base station and the target terminal, so that the target base station can, according to the key update instruction information, The data packet sent to the target terminal is processed, and when receiving the data packet, the target terminal can perform key update judgment according to the received key update instruction information. It can be seen that the cooperation of the source base station using the method described in this embodiment and the terminal using the method described in the first embodiment can prevent the terminal from using a wrong key to decode data packets after switching from the source base station to the target base station.

In the third embodiment of the present invention, a data transmission method during a mobile process is provided, which is applied to a target base station. As shown in FIG. 7, the method includes the following steps:

Step S701, the target base station receives the key update instruction information sent by the source base station;

In a specific embodiment of the present invention, the target base station receives the handover request message sent by the source base station, and extracts the key update indication information from the handover request message. That is to say, the source base station carries the key update instruction information through a handover request message.

Further, in the embodiment of the present invention, after receiving the handover request message sent by the source base station, the target base station further includes: when the target base station allows the target terminal to access, sending a handover confirmation message to the source base station, the The handover confirmation message carries key update indication information that the active base station needs to send to the target terminal.

Step S702, after the target terminal switches into the base station from the source base station, the target base station processes the first packet sent to the target terminal according to the key update instruction information, and sends the target terminal to the target terminal through the service node after processing Send the first packet.

In the embodiment of the present invention, the key update indication information includes: the threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, the identifier carried in the data packet used to indicate the key update information. Specifically, the threshold information of the PDCP sequence number of the data packet used for key update judgment includes but is not limited to: the PDCP sequence number information of the last data packet sent by the source base station, or the first newly transmitted data packet sent by the target base station Packet's PDCP sequence number information. The identification information may be but not limited to end maker.

Specifically, in the embodiment of the present invention, when the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the first packet is the first newly transmitted data packet of the target base station ; At this time, processing the first packet sent to the target terminal specifically includes: setting the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the threshold. In a specific embodiment of the present invention, when the key update instruction information is the PDCP sequence number information of the last data packet sent by the source base station, the first newly transmitted data packet sent to the target terminal The PDCP sequence number of the packet is set to the PDCP sequence number of the last data packet sent by the source base station plus one; when the key update indication information is the PDCP sequence number of the first newly transmitted data packet sent by the target base station information, set the PDCP sequence number of the first newly transmitted data packet sent to the target terminal as the PDCP sequence number of the first newly transmitted data packet sent by the target base station.

Further, in the embodiment of the present invention, when the key update instruction information is the identification information carried in the data packet used for key update judgment, the first packet is the retransmission data forwarded by the source base station to the target base station packet or the first newly transmitted data packet of the target base station. At this time, processing the first packet sent to the target terminal specifically includes: carrying the identification information in a header of the first packet;

Further, in the embodiment of the present invention, when the key update indication information is the threshold information of the PDCP sequence number of the data packet used for the key update judgment and the identification information carried in the data packet used for the key update judgment , if the first packet is a retransmission data packet forwarded by the source base station to the target base station, processing the first packet sent to the target terminal specifically includes: carrying the identification information in a header of the first packet. If the first packet is the first newly transmitted data packet of the target base station, processing the first packet sent to the target terminal specifically includes: setting the first new transmitted data packet of the base station to be sent to the target terminal The PDCP sequence number of the data packet, so that the PDCP sequence number is greater than or equal to the threshold. This embodiment provides double judgment criteria for terminal key judgment, which improves the accuracy of key update.

Further, in the embodiment of the present invention, when the key update indication information is the threshold information of the PDCP sequence number of the data packet used for the key update judgment and the identification information carried in the data packet used for the key update judgment , the first packet may also be the first newly transmitted data packet of the target base station. At this time, processing the first packet sent to the target terminal specifically includes: setting the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the set The above threshold, and carry the identification information in the header of the first newly transmitted data packet.

To sum up, after receiving the key update instruction information sent by the source terminal, the target base station using the method described in this embodiment processes the first packet sent to the target terminal, so that the target base station that has obtained the key update instruction When the terminal receives the first packet, it can accurately judge the key update. It can be seen that the target base station using the method described in this embodiment cooperates with the terminal using the method described in the first embodiment and the source base station using the method described in the second embodiment, so that the terminal can be handed over from the source base station to the target base station Finally, avoid using the wrong key to decode the packet.

In the fourth embodiment of the present invention, a method for data transmission during movement is provided, in which the key update indication information is the identification information carried in the data packet for indicating key update (for example, end maker ), but the key update indication information does not need to be sent by the source base station to the target terminal and the target base station. Instead, the key update judgment is realized by modifying the protocol between the terminal and the base station. For example, after receiving the RRC reconfiguration message sent by the source base station, if the terminal receives the data packet sent by the serving node, it starts to detect whether the specified identification information is carried in the data packet, and the terminal detects that the data packet When the specified key update indication information is carried in the , update the currently used key to the key of the target base station, and use the updated key to decode the data packet. After the terminal switches into the base station from the source base station, the target base station adds specified identification information to the first packet sent to the target terminal, and sends the first packet with the specified identification information to the target terminal through the serving node. Terminal sends.

The method described in this embodiment can also well solve the problem in the prior art that the terminal uses a wrong key to decode the data packet after switching from the source base station to the target base station.

The above describes the key update scheme respectively from the side of the terminal, the source base station, and the target base station, and the overall implementation process of the present invention is described below through several specific embodiments.

In the fifth embodiment of the present invention, a data transmission method in the process of moving is provided. The application scenario of this embodiment is: two base stations eNB can be connected to a service node node, wherein the service node can be a base station or WT et al. The UE is within the overlapping coverage of two eNBs and a serving node. Initially, the source eNB and the serving node provide services for the UE. When the UE moves from the source eNB to the target eNB, the target eNB and the serving node start to provide services for the UE. In order to ensure uninterrupted data of the UE, during this process, both eNBs send data packets to the serving node, and the serving node is responsible for sending the data packets to the UE.

In order to ensure that the UE can update the key in time, the implementation process of the method described in this embodiment is as follows:

Step 1, when the source eNB detects that the target terminal meets the conditions for handover to the target eNB, it sends a handover request message to the target eNB. Wherein, the handover request message carries the PDCP SN of the last data packet sent by the source eNB to the UE.

Step 2: After the target eNB accepts it, it replies with a handover confirmation message, and the handover confirmation message will carry the PDCP SN of the last data packet sent by the source eNB to the UE.

Step 3, the source eNB sends an RRC reconfiguration message to the UE, instructing the UE to perform handover. Wherein, the RRC reconfiguration message carries the PDCP SN of the last data packet sent by the source eNB to the UE. It should be pointed out that after the source eNB sends the RRC reconfiguration message to the UE, it will not terminate the data transmission to the UE. The source eNB will continue to transmit the data in the cache to the serving node, and then the serving node will send it to the UE. Alternatively, the source eNB forwards the data packets that have not been sent successfully or not sent to the target eNB, and the target eNB continues to transmit the data in the cache to the serving node, and then the serving node sends it to the UE.

Step 4. After receiving the RRC reconfiguration message, the UE obtains the PDCP SN information of the last data packet sent by the source eNB to the UE from the RRC reconfiguration message;

Step 5: After the UE accesses the base station, the target eNB numbers the first newly transmitted data packet of the base station according to the PDCPSN of the last data packet sent by the source eNB to the UE, and transmits the data packet to the service node, and then sent to the UE by the serving node.

Step 6: After the UE receives the data packet, if it judges that the PDCP SN of the data packet is less than or equal to the PDCP SN of the last data packet sent by the source eNB, the UE continues to decode with the key of the source eNB. When the PDCPSN of the data packet received by the UE is greater than the PDCP SN of the last data packet sent by the source eNB, the UE updates the key and uses the key of the target eNB to decode the received data packet and subsequent data packets.

In the sixth embodiment of the present invention, a data transmission method during a moving process is provided. The application scenario of this embodiment is: two base stations eNBs can both be connected to a service node node. The UE is within the overlapping coverage of two eNBs and a serving node. Initially, the source eNB and the serving node provide services for the UE. When the UE moves from the source eNB to the target eNB, the target eNB and the serving node start to provide services for the UE. In order to ensure uninterrupted data of the UE, during this process, both eNBs send data packets to the serving node, and the serving node is responsible for sending the data packets to the UE.

In order to ensure that the UE can update the key in time, the implementation process of the method described in this embodiment is as follows:

Step 1, when the source eNB detects that the target terminal meets the conditions for handover to the target eNB, it sends a handover request message to the target eNB. Wherein, the handover message carries the PDCP SN of the first newly transmitted data packet sent by the target eNB to the UE.

Step 2: After receiving the acceptance, the target eNB replies with a handover confirmation message, and the handover confirmation message will carry the PDCP SN of the first newly transmitted data packet sent by the target eNB to the UE.

Step 3, the source eNB sends an RRC reconfiguration message to the UE, instructing the UE to perform handover. Wherein, the RRC reconfiguration message carries the PDCP SN of the first newly transmitted data packet sent by the target eNB to the UE. It should be pointed out that after the source eNB sends the RRC reconfiguration message to the UE, it will not terminate the data transmission to the UE. The source eNB will continue to transmit the data in the cache to the serving node, and then the serving node will send it to the UE. Alternatively, the source eNB forwards the data packets that have not been sent successfully or not sent to the target eNB, and continues to transmit the data in the buffer to the serving node, and then the serving node sends it to the UE.

Step 4: After receiving the RRC reconfiguration message, the UE obtains the PDCP SN information of the first newly transmitted data packet sent by the target eNB to the UE from the RRC reconfiguration message;

Step 5: After the UE accesses the base station, the target eNB numbers the new data packets of the target eNB according to the PDCPSN of the first new data packet sent by the target eNB, and transmits them to the serving node, and then the serving node sent to the UE.

Step 6: After the UE receives the data packet, if it judges that the PDCP SN of the data packet is smaller than the PDCP SN of the first newly transmitted data packet sent by the target eNB to the UE, the UE continues to decode using the key of the source eNB. When the PDCP SN of the data packet received by the UE is greater than or equal to the PDCP SN of the first newly transmitted data packet sent by the target eNB to the UE, the UE updates the key, and uses the key of the target eNB to process the received data packet and subsequent The packets are decoded.

In the seventh embodiment of the present invention, a data transmission method during the mobile process is provided. The application scenario of this embodiment is: the UE is in the overlapping coverage of two eNBs and serving nodes, and the source eNB is the S-eNB of the UE (Second eNB) and the serving node perform split bearer (split bearer) to provide services for the UE. When the UE moves from the source eNB to the target eNB, the S-eNB update process occurs, but the serving node can still serve as the serving node that provides the split bearer. In this process, the source S-eNB needs to transmit the UE's data to the serving node, which then sends it to the UE, and the target S-eNB also needs to transmit the UE's data to the serving node, which then sends it to the UE.

In order to ensure that the UE can update the key in time, the implementation process of the method described in this embodiment is as follows:

Step 1, when the M-eNB detects that the target terminal meets the conditions for switching to the target eNB, it sends an S-eNB modification request message to the source S-eNB.

Step 2. The source S-eNB replies with an S-eNB modification request confirmation message, which will carry the PDCP SN of the last data packet sent by the source S-eNB to the UE, or the first new data packet sent by the target S-eNB to the UE. PDCP SN of the packet.

In step 3, the M-eNB sends a handover request message to the target S-eNB. Wherein, the handover message carries the PDCP SN of the last data packet sent by the source S-eNB to the UE, or the PDCP SN of the first newly transmitted data packet sent by the target S-eNB to the UE.

Step 4. After the target S-eNB accepts it, it replies with a handover confirmation message. The handover confirmation message will carry the PDCP SN of the last data packet sent by the source S-eNB to the UE, or the first packet sent by the target S-eNB to the UE. PDCPSN of the packet.

In step 5, the M-eNB sends an RRC reconfiguration message to the UE, instructing the UE to perform an S-eNB update process. The RRC reconfiguration message carries the PDCP SN of the last data packet sent by the source S-eNB to the UE, or the PDCP SN of the first newly transmitted data packet sent by the target S-eNB to the UE.

Step 6: After the UE accesses the base station, the target S-eNB, according to the PDCP SN of the last data packet sent by the source S-eNB to the UE, or according to the first new data packet sent by the target S-eNB to the UE The target eNB numbers the first newly transmitted data packet of the base station, and transmits the data packet to the serving node, and then the serving node sends it to the UE.

Step 7: After UE receives the data packet, if it judges that the PDCP SN of the data packet is less than or equal to the PDCP SN of the last data packet sent by the source eNB, the UE continues to decode with the key of the source S-eNB. When the PDCP SN of the data packet received by the UE is greater than the PDCP SN of the last data packet sent by the source S-eNB, the UE updates the key, and uses the key of the target S-eNB to process the received data packet and subsequent data The packet is decoded.

Or, after the UE receives the data packet, if it judges that the PDCP SN of the data packet is smaller than the PDCP SN of the first newly transmitted data packet sent by the target S-eNB to the UE, the UE continues to use the key of the source S-eNB to perform decoding. When the PDCP SN of the data packet received by the UE is greater than or equal to the PDCP SN of the first newly transmitted data packet sent by the target S-eNB to the UE, the UE updates the key and uses the key of the target S-eNB to packet and subsequent packets are decoded.

In the eighth embodiment of the present invention, a data transmission method during a moving process is provided. This embodiment describes the implementation process of the present invention in conjunction with a specific application example. specific:

As shown in FIG. 8 , in this embodiment, both the old and new eNBs (namely, the source eNB and the target eNB) can be connected to a service node node. The UE is within the overlapping coverage of two eNBs and a serving node. Initially, the source eNB and the serving node provide services for the UE. When the UE moves from the source eNB to the target eNB, the target eNB and the serving node start to provide services for the UE. In order to ensure uninterrupted data of the UE, during the handover process, both eNBs send data packets to the serving node, and the serving node is responsible for sending the data packets to the UE. That is to say, during the handover process, both eNBs send data packets to the UE through the serving node. However, in the process of sending data packets, the data packets of the source eNB will be lost incorrectly and need to be retransmitted by the target eNB. , that is to use the key of the target eNB to retransmit the data packet of the source eNB, then the UE needs to update the key in time.

In the embodiment of the present invention, the method described in the fifth embodiment is adopted to perform key update judgment. The following is an example for illustration, assuming that the PDCP SN of the last data packet sent by the source eNB to the UE is 4, but the data packet with PDCP SN=4 is lost. Continue as shown in Figure 8:

1. The source eNB forwards the PDCP SN=4 data packet to the target eNB, and the target eNB retransmits it.

2. In order for the UE to update the key to the key of the target eNB, the target eNB will first send a new data packet with PDCP SN=5.

3. After the UE receives the newly transmitted data packet with PDCP SN=5 sent by the target eNB, since the PDCP SN of the data packet is greater than 4, the UE performs key update, and uses the updated key to pair the received data packet Perform decoding, and feed back ACK information about the data packet with PDCP SN=5 to the serving node, or feed back a status report.

4. The target eNB receives the ACK information about the data packet with PDCP SN=5 fed back by the serving node, or the target eNB receives the status report fed back by the UE, and confirms that the UE has received the newly transmitted data packet with PDCP SN=5.

5. The target eNB uses the key of the target eNB to encrypt the data packet whose PDCP SN of the source base station is equal to 4, and then retransmits it.

6. After receiving the data packet with PDCP SN=4, the UE still uses the updated key to decode the data packet.

It should be pointed out that, in the embodiment of the present invention, for the data packet of the source eNB to be retransmitted by the target eNB, the target eNB needs to determine that the key of the UE has been updated to the target eNB, and then retransmit the data packet of the source eNB. The method for the target eNB to determine whether the key has been updated by the UE may be as follows: the target eNB first sends the new data packet of the target eNB, and confirms that the UE has received it, then it is considered that the UE has updated the key. The method for the target eNB to confirm that the UE has received the newly transmitted data packet may be: the bottom layer of the target eNB feeds back confirmation information, such as: ACK; or, the UE sends information about the reception of the data packet to the target eNB, such as: status report.

In the ninth embodiment of the present invention, a data transmission method in the process of moving is provided. The application scenario of this embodiment is: two base stations eNB can be connected to a service node node, wherein the service node can be a base station or WT et al. The UE is within the overlapping coverage of two eNBs and a serving node. Initially, the source eNB and the serving node provide services for the UE. When the UE moves from the source eNB to the target eNB, the target eNB and the serving node start to provide services for the UE. In order to ensure uninterrupted data of the UE, during this process, both eNBs send data packets to the serving node, and the serving node is responsible for sending the data packets to the UE.

In order to ensure that the UE can update the key in time, the implementation process of the method described in this embodiment is as follows:

Step 1, when the source eNB detects that the target terminal meets the conditions for handover to the target eNB, it sends a handover request message to the target eNB. Wherein, the key update instruction information is carried in the switching message; the key update instruction information is the identification information end maker carried in the data packet for indicating the key update.

Step 2: After the target eNB accepts it, it replies with a handover confirmation message, and the handover confirmation message will carry the key update instruction information sent by the source eNB to the UE.

Step 3, the source eNB sends an RRC reconfiguration message to the UE, instructing the UE to perform handover. Wherein, the RRC reconfiguration message carries key update indication information sent by the source eNB to the UE.

Step 4, after the UE receives the RRC reconfiguration message, it obtains the key update instruction information sent by the source eNB to the UE from the RRC reconfiguration message;

Step 5: After the UE accesses the base station, the target eNB adds endmaker identification information to the header of the first packet sent to the UE.

Step 6. After receiving the data packet, the UE detects whether the end maker identification information is carried in the data packet. When the end maker identification information is carried in the data packet, the key is updated directly, and the key of the target eNB is used to update the received data packet and subsequent packets are decoded.

In the tenth embodiment of the present invention, a data transmission method during a moving process is provided. This embodiment describes the implementation process of the present invention in conjunction with a specific application example. specific:

In this embodiment, both the old and new eNBs (namely, the source eNB and the target eNB) can be connected to a certain service node node. The UE is within the overlapping coverage of two eNBs and a serving node. Initially, the source eNB and the serving node provide services for the UE. When the UE moves from the source eNB to the target eNB, the target eNB and the serving node start to provide services for the UE. In order to ensure uninterrupted data of the UE, during the handover process, both eNBs send data packets to the serving node, and the serving node is responsible for sending the data packets to the UE. That is to say, during the handover process, both eNBs send data packets to the UE through the serving node. However, in the process of sending data packets, the data packets of the source eNB will be lost incorrectly and need to be retransmitted by the target eNB. , that is to use the key of the target eNB to retransmit the data packet of the source eNB, then the UE needs to update the key in time.

Specifically, the implementation process of the method described in the embodiment of the present invention is as follows:

Step 1, when the source eNB detects that the target terminal meets the conditions for handover to the target eNB, it sends a handover request message to the target eNB. Wherein, the key update instruction information is carried in the handover message; the key update instruction information includes: the identification information end maker carried in the data packet for indicating the key update, and the data packet PDCP for judging the key update Threshold information for serial numbers. Wherein, the threshold information is: the PDCP SN of the last data packet sent by the source eNB to the UE, or the PDCP SN of the first newly transmitted data packet sent by the target eNB to the UE.

Step 2: After the target eNB accepts it, it replies with a handover confirmation message, and the handover confirmation message will carry the key update instruction information sent by the source eNB to the UE.

Step 3, the source eNB sends an RRC reconfiguration message to the UE, instructing the UE to perform handover. Wherein, the RRC reconfiguration message carries key update indication information sent by the source eNB to the UE.

Step 4, after the UE receives the RRC reconfiguration message, it obtains the key update instruction information sent by the source eNB to the UE from the RRC reconfiguration message;

Step 5, when the target eNB starts to provide data services after the UE accesses the base station, it can first send the retransmission data packet transmitted by the source eNB to the UE, and then send the new transmission data packet of the base station to the UE, or first send the data packet to the UE The UE sends the newly transmitted data packet of the base station, and then sends the retransmitted data packet previously transmitted by the source eNB to the UE. Therefore, the target eNB can add end maker identification information to the header of the first retransmission data packet to be sent, and set the PDCP sequence number of the first newly transmitted data packet of the base station according to the obtained PDCP sequence number threshold .

Specifically, when the threshold information of the PDCP SN is the PDCP SN of the last data packet sent by the source eNB to the UE, the target base station sets the PDCP SN of the newly transmitted data packet to (the PDCP SN of the last data packet sent by the source eNB to the UE SN+1), when the PDCP SN threshold information is the PDCP SN of the first newly transmitted data packet sent to the UE by the target eNB, the target base station directly uses the PDCP SN threshold as the PDCP SN of the newly transmitted data packet.

Step 6: After the UE receives the data packet, if it detects that the data packet carries the end maker identification information, or the PDCP SN of the detected data packet and the threshold value of the PDCP sequence number of the data packet used for key update judgment satisfy the If the set requirements are met, the key is updated.

The following is an example to illustrate. In this example, the threshold value of the PDCP sequence number of the data packet used for key update judgment is set equal to the PDCP SN of the last data packet sent by the source eNB to the UE, and the last data packet sent by the source eNB to the UE The PDCP SN of the packet is 4. Assuming that the source eNB sends a data packet with PDCP SN=4 to the UE and the data packet is lost, as shown in Figure 9:

Step 1, the source eNB forwards the data packet with PDCP SN=4 to the target eNB, and the target eNB retransmits it.

Step 2, before the target eNB sends the new data packet of the base station to the UE, in order for the UE to update the key of the target eNB, the target eNB will add an end maker to the packet header of the PDCP SN=4, and then retransmit; at the same time, The target eNB sets the PDCP SN of the first newly transmitted data packet of the base station to 5.

Step 3, if the UE receives the data packet with PDCP SN=4 and detects that an endmaker is added to the header of the data packet, the UE updates the key and decodes the data packet. However, if PDCP SN=4 and the data packet with the end maker added in the header is also lost, since the PDCP SN of the first newly transmitted data packet of the target eNB is set to 5, the UE can still accurately update the key according to the PDCPSN judge.

In the eleventh embodiment of the present invention, a terminal is provided, as shown in FIG. 10 , including:

An information acquisition module 1010, configured to acquire key update instruction information sent by the source base station;

An update judgment module 1020, configured to perform key update judgment according to the key update indication information when receiving the data packet sent by the service node;

The first update processing module 1030 is configured to update the currently used key of the source base station to the key of the target base station when the update judging module determines that a key update is required;

The first data processing module 1040 is configured to use the updated key to decode the data packet received by the terminal.

Further, in the embodiment of the present invention, the information acquisition module is specifically configured to receive the RRC reconfiguration message sent by the source base station, and extract the key update instruction information from the RRC reconfiguration message.

Further, in the embodiment of the present invention, the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate the key update carried in the data packet identification information.

Further, in the embodiment of the present invention:

When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the update judgment module is specifically used to detect the PDCP sequence number of the data packet and the Whether the size relationship between the thresholds of the PDCP serial number of the data packet for key update judgment satisfies the set standard;

When the key update indication information is identification information carried in a data packet for indicating key update, the update judgment module is specifically configured to detect whether the identification information is carried in the packet header of the data packet, When the identification information is carried, it is determined that a key update is required, otherwise, it is determined that a key update is not required;

When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet used to indicate the key update, the update judgment module specifically uses To detect whether the size relationship between the PDCP sequence number of the data packet and the threshold value of the PDCP sequence number of the data packet used for key update judgment meets the set standard, and to detect whether the packet header of the data packet carries the The above identification information, when any detection result is yes, it is determined that the key update is required, otherwise, it is determined that the key update is not required.

Further, in the embodiment of the present invention, the threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number information of the last data packet sent by the source base station, or, the target base station PDCP sequence number information of the first newly transmitted data packet sent;

And/or, the identification information includes: end maker.

Further, in the embodiment of the present invention, when the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the last data packet sent by the source base station, the update judgment module , specifically for extracting the PDCP sequence number of the received data packet, comparing the PDCP sequence number of the data packet with the PDCP sequence number of the last data packet sent by the source base station, when the PDCP sequence number of the data packet is When the sequence number is less than or equal to the PDCP sequence number of the last data packet sent by the source base station, it is determined that no key update is required, otherwise, it is determined that a key update is required;

When the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, the update judgment module is specifically used to extract the received The PDCP sequence number of the data packet, and compare the PDCP sequence number of the data packet with the PDCP sequence number of the first newly transmitted data packet sent by the target base station, when the PDCP sequence number of the data packet is less than When the PDCP sequence number of the first newly transmitted data packet is sent by the target base station, it is determined that key update is not required; otherwise, it is determined that key update is required.

In summary, the embodiment of the present invention provides various judgment criteria for key update, and the terminal described in this embodiment can perform key update judgment and key update operation according to the pre-acquired key update instruction information, It solves the problem in the prior art that the terminal uses a wrong key to decode the data packet after switching from the source base station to the target base station.

In a twelfth embodiment of the present invention, a source base station is provided, as shown in FIG. 11 , including:

The first information sending module 1110 is configured to send key update instruction information to the target base station when it is detected that the target terminal meets the conditions for switching to the target base station;

The second information sending module 1120 is configured to send key update instruction information to the target terminal after the target base station confirms the handover;

The data sending module 1130 is configured to transmit the data packet in the buffer to the target terminal through the service node and/or forward the data packet in the buffer to the target base station.

Further, in the embodiment of the present invention, the first information sending module is specifically configured to send a handover request message to the target base station when it is detected that the target terminal is about to be handed over to the target base station, and the handover request message carries the Key update instructions.

Further, in the embodiment of the present invention, the second information sending module is specifically configured to determine that the target base station has confirmed the handover after receiving the handover confirmation message fed back by the target base station, and extract from the handover confirmation message output the carried key update instruction information, and send the extracted key update instruction information to the target terminal.

Further, in the embodiment of the present invention, the second information sending module is specifically configured to send an RRC reconfiguration message to the target terminal, and carry the key update instruction information in the RRC reconfiguration message.

Further, in the embodiment of the present invention, the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate the key update carried in the data packet identification information.

Further, in the embodiment of the present invention, the threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number information of the last data packet sent by the source base station, or the target PDCP sequence number information of the first newly transmitted data packet sent by the base station;

And/or, the identification information includes: end maker.

Further, in the embodiment of the present invention, when the types of the source base station and the target base station are both the second base station S-eNB, the first information sending module sends the Key update instruction information, and the second information sending module sends the key update instruction information to the target terminal through the M-eNB.

In summary, using the source base station described in this embodiment, the key update instruction information used to assist the terminal in key update judgment is sent to the target base station and the target terminal, so that the target base station can, according to the key update instruction information, The data packet sent to the target terminal is processed, and when receiving the data packet, the target terminal can make a key update judgment according to the received key update instruction information. It can be seen that the combination of the source base station described in this embodiment and the terminal described in the eleventh embodiment can prevent the terminal from using a wrong key to decode data packets after switching from the source base station to the target base station.

In a thirteenth embodiment of the present invention, a target base station is provided, as shown in FIG. 12 , including:

An information receiving module 1210, configured to receive key update instruction information sent by the source base station;

The first processing module 1220 is configured to process the first packet sent to the target terminal according to the key update instruction information after the target terminal switches into the base station from the source base station;

The first sending module 1230 is configured to send the first packet processed by the first processing module to the target terminal through the service node.

Further, in the embodiment of the present invention, the information receiving module is specifically configured to receive the handover request message sent by the source base station, and extract the key update instruction information from the handover request message.

Further, in the embodiment of the present invention, the information receiving module is further configured to send a handover confirmation message to the source base station when the target terminal is allowed to access after receiving the handover request message sent by the source base station, The handover confirmation message carries key update instruction information that the active base station needs to send to the target terminal.

Further, in the embodiment of the present invention, the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate that the key update is carried in the data packet Identification information in .

Further, in the embodiment of the present invention:

When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the first packet is the first newly transmitted data packet of the target base station; the first processing module, specifically It is used to set the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the threshold;

When the key update indication information is the identification information carried in the data packet used to indicate the key update, the first packet is the retransmission data packet forwarded by the source base station to the target base station or the first packet of the target base station For a newly transmitted data packet, the first processing module is specifically configured to carry the identification information in the header of the first packet;

When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet used to indicate the key update, when the first packet is the source base station When forwarding the retransmission data packet to the target base station, the first processing module is specifically configured to carry the identification information in the header of the first packet; when the first packet is the first newly transmitted data of the target base station When sending a packet, the first processing module is specifically configured to set the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the threshold.

Further, in the embodiment of the present invention, the threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number information of the last data packet sent by the source base station, or the target PDCP sequence number information of the first newly transmitted data packet sent by the base station;

And/or, the identification information includes: end maker.

Further, in the embodiment of the present invention, when the key update instruction information is the PDCP sequence number information of the last data packet sent by the source base station, the first processing module is specifically configured to send the key update information to the target The PDCP sequence number of the first packet sent by the terminal is set to the PDCP sequence number of the last data packet sent by the source base station plus one;

When the key update indication information is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, the first processing module is specifically used to set the first packet to be sent to the target terminal The PDCP sequence number is set as the PDCP sequence number of the first newly transmitted data packet sent by the target base station; the first packet is the first newly transmitted data packet of the target base station.

In summary, using the target base station described in this embodiment, after receiving the key update instruction information sent by the source terminal, it processes the first packet sent to the target terminal, so that the target terminal that has obtained the key update instruction When the first packet is received, the key update judgment can be accurately performed. It can be seen that using the cooperation of the target base station described in this embodiment with the terminal described in the eleventh embodiment and the source base station described in the twelfth embodiment can make the terminal handover from the source base station to the target base station , to avoid using the wrong key to decode the packet.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on its differences from other embodiments. Especially for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to the part of the description of the method embodiment.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, disk or CD, etc.

In a word, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (40)

1. A data transmission method in a moving process, characterized in that, comprising: The terminal obtains the key update indication information sent by the source base station; When receiving the data packet sent by the service node, the terminal performs a key update judgment according to the key update instruction information; When the terminal determines that a key update is needed, it updates the currently used key of the source base station to the key of the target base station, and uses the updated key to decode the data packet received by the terminal. 2. The method according to claim 1, wherein the terminal obtains the key update instruction information sent by the source base station, comprising: The terminal receives the radio resource control RRC reconfiguration message sent by the source base station, and extracts the key update indication information from the RRC reconfiguration message. 3. The method according to claim 1, wherein the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate key update The identification information carried in the data packet. 4. The method of claim 3, wherein, When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the key update judgment according to the key update indication information includes: detecting the data packet Whether the size relationship between the PDCP sequence number of the data packet and the threshold value of the PDCP sequence number used for key update judgment meets the set standard, and when it is satisfied, it is determined that the key update is required; renew; When the key update indication information is identification information carried in a data packet for indicating key update, the key update judgment according to the key update indication information includes: detecting the data packet Whether the identification information is carried in the header of the packet, and when the identification information is carried, it is determined that a key update is required; otherwise, it is determined that a key update is not required; When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet used to indicate the key update, the key update according to the key update Instruction information, to perform key update judgment, including: detecting whether the magnitude relationship between the PDCP sequence number of the data packet and the threshold value of the data packet PDCP sequence number used for key update judgment meets the set standard, and detecting Whether the identification information is carried in the packet header of the data packet, when any detection result is yes, it is determined that key update is required; otherwise, it is determined that key update is not required. 5. The method of claim 3 or 4, wherein, The threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number information of the last data packet sent by the source base station, or the first newly transmitted data packet sent by the target base station PDCP serial number information; And/or, the identification information includes: end maker. 6. The method of claim 5, wherein, When the threshold information of the PDCP sequence number of the data packet used for the key update judgment is the PDCP sequence number information of the last data packet sent by the source base station, the key update judgment is performed according to the key update instruction information , including: the terminal extracts the PDCP sequence number of the received data packet, compares the PDCP sequence number of the data packet with the PDCP sequence number of the last data packet sent by the source base station, and when the data packet When the PDCP sequence number of the source base station is less than or equal to the PDCP sequence number of the last data packet sent by the source base station, it is determined that no key update is required, otherwise, it is determined that a key update is required; When the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, the encryption is performed according to the key update indication information. The key update judgment includes: the terminal extracts the PDCP sequence number of the received data packet, and compares the PDCP sequence number of the data packet with the PDCP sequence number of the first newly transmitted data packet sent by the target base station In comparison, when the PDCP sequence number of the data packet is smaller than the PDCP sequence number of the first newly transmitted data packet sent by the target base station, it is determined that key update is not required; otherwise, it is determined that key update is required. 7. A data transmission method in a moving process, characterized in that it is applied to a source base station, and the method comprises: When the source base station detects that the target terminal meets the conditions for switching to the target base station, it sends key update instruction information to the target base station; The source base station sends key update instruction information to the target terminal after the target base station confirms the handover; The source base station transmits the data packet in the cache to the target terminal through the serving node and/or forwards the cached data packet to the target base station. 8. The method according to claim 7, wherein the source base station sending key update instruction information to the target base station comprises: the source base station sending a handover request message to the target base station, and the handover The request message carries the key update indication information. 9. The method according to claim 8, wherein the source base station sends key update instruction information to the target terminal after the target base station confirms the handover, comprising: The source base station receives the handover confirmation message fed back by the target base station, extracts key update instruction information carried in the handover confirmation message, and sends the extracted key update instruction information to the target terminal. 10. The method according to claim 7, wherein the source base station sends key update instruction information to the target terminal, comprising: The source base station sends an RRC reconfiguration message to the target terminal, and carries the key update indication information in the RRC reconfiguration message. 11. The method according to claim 7, wherein the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate key update The identification information carried in the data packet. 12. The method of claim 11, wherein, The threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number information of the last data packet sent by the source base station, or the first newly transmitted data sent by the target base station PDCP sequence number information of the packet; And/or, the identification information includes: end maker. 13. The method according to any one of claims 7 to 12, wherein when the types of the source base station and the target base station are both the second base station S-eNB, the source base station uses the main base station M-eNB Sending the key update instruction information to the target base station, and sending the key update instruction information to the target terminal through the M-eNB. 14. A data transmission method in a mobile process, characterized in that it is applied to a target base station, and the method comprises: The target base station receives the key update instruction information sent by the source base station; After the target terminal switches into the base station from the source base station, the target base station processes the first packet sent to the target terminal according to the key update instruction information, and sends the target packet to the target terminal through the service node after processing. The terminal sends the first packet. 15. The method according to claim 14, wherein the target base station receives the key update instruction information sent by the source base station, comprising: The target base station receives the handover request message sent by the source base station, and extracts the key update indication information from the handover request message. 16. The method according to claim 15, wherein after the target base station receives the handover request message sent by the source base station, further comprising: When allowing the target terminal to access, the target base station sends a handover confirmation message to the source base station, where the handover confirmation message carries key update instruction information that the active base station needs to send to the target terminal. 17. The method according to claim 14, wherein the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate key update The identification information carried in the data packet. 18. The method of claim 17, wherein, When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the first packet is the first newly transmitted data packet of the target base station; Processing the first packet sent specifically includes: setting the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the threshold; When the key update indication information is the identification information carried in the data packet used for key update judgment, the first packet is the retransmission data packet forwarded by the source base station to the target base station or the first packet of the target base station The newly transmitted data packet, the processing of the first packet sent to the target terminal specifically includes: carrying the identification information in the header of the first packet; When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet used for key update judgment, when the first packet is the source base station When forwarding the retransmission data packet to the target base station, the processing the first packet sent to the target terminal specifically includes: carrying the identification information in the header of the first packet; when the first packet is the target When the first newly transmitted data packet of the base station, the processing of the first packet sent to the target terminal specifically includes: setting the PDCP sequence of the first newly transmitted data packet of the base station sent to the target terminal number, so that the PDCP sequence number is greater than or equal to the threshold. 19. The method of claim 17 or 18, wherein, The threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number information of the last data packet sent by the source base station, or the first newly transmitted data sent by the target base station PDCP sequence number information of the packet; And/or, the identification information includes: end maker. 20. The method according to claim 19, wherein the processing the first packet sent to the target terminal according to the key update instruction information comprises: When the key update instruction information is the PDCP sequence number information of the last data packet sent by the source base station, set the PDCP sequence number of the first packet sent to the target terminal as the last packet sent by the source base station The PDCP sequence number of the data packet is increased by one; When the key update instruction information is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, set the PDCP sequence number of the first packet sent to the target terminal as the The PDCP sequence number of the first newly transmitted data packet; The first packet is the first newly transmitted data packet of the target base station. 21. A terminal, characterized in that it comprises: An information acquisition module, configured to acquire key update instruction information sent by the source base station; An update judgment module, configured to perform a key update judgment according to the key update instruction information when receiving the data packet sent by the service node; A first update processing module, configured to update the currently used key of the source base station to the key of the target base station when the update judging module determines that key updating is required; The first data processing module is configured to use the updated key to decode the data packet received by the terminal. 22. The terminal according to claim 21, wherein the information obtaining module is specifically configured to receive the RRC reconfiguration message sent by the source base station, and extract the encrypted key from the RRC reconfiguration message Key update instructions. 23. The terminal according to claim 21, wherein the key update instruction information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate the key update The identification information carried in the data packet. 24. The terminal of claim 23, wherein: When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the update judgment module is specifically used to detect the PDCP sequence number of the data packet and the Whether the size relationship between the thresholds of the PDCP serial number of the data packet for key update judgment satisfies the set standard; When the key update indication information is identification information carried in a data packet for indicating key update, the update judgment module is specifically configured to detect whether the identification information is carried in the packet header of the data packet, When the identification information is carried, it is determined that a key update is required, otherwise, it is determined that a key update is not required; When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet used to indicate the key update, the update judgment module specifically uses To detect whether the size relationship between the PDCP sequence number of the data packet and the threshold value of the PDCP sequence number of the data packet used for key update judgment meets the set standard, and to detect whether the header of the data packet carries the The above identification information, when any detection result is yes, it is determined that the key update is required, otherwise, it is determined that the key update is not required. 25. The terminal according to claim 23 or 24, wherein the threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number of the last data packet sent by the source base station information, or, the PDCP sequence number information of the first newly transmitted data packet sent by the target base station; And/or, the identification information includes: end maker. 26. The terminal of claim 25, wherein: When the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the last data packet sent by the source base station, the update judgment module is specifically configured to extract the received The PDCP sequence number of the data packet, compare the PDCP sequence number of the data packet with the PDCP sequence number of the last data packet sent by the source base station, when the PDCP sequence number of the data packet is less than or equal to the PDCP sequence number sent by the source base station When the PDCP sequence number of the last data packet of , it is determined that no key update is required, otherwise, it is determined that a key update is required; When the threshold information of the PDCP sequence number of the data packet used for key update judgment is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, the update judgment module is specifically used to extract the received The PDCP sequence number of the data packet, and compare the PDCP sequence number of the data packet with the PDCP sequence number of the first newly transmitted data packet sent by the target base station, when the PDCP sequence number of the data packet is less than When the PDCP sequence number of the first newly transmitted data packet is sent by the target base station, it is determined that key update is not required; otherwise, it is determined that key update is required. 27. A source base station, comprising: The first information sending module is configured to send key update instruction information to the target base station when it is detected that the target terminal meets the conditions for switching to the target base station; A second information sending module, configured to send key update instruction information to the target terminal after the target base station confirms the handover; A data sending module, configured to transmit the data packets in the buffer to the target terminal through the serving node and/or forward the data packets in the buffer to the target base station. 28. The source base station according to claim 27, wherein the first information sending module is specifically configured to send a handover request message to the target base station when it is detected that the target terminal is about to be handed over to the target base station, the The handover request message carries the key update indication information. 29. The source base station according to claim 28, wherein the second information sending module is specifically configured to determine that the target base station has confirmed the handover after receiving the handover confirmation message fed back by the target base station, and from Extracting the carried key update instruction information from the handover confirmation message, and sending the extracted key update instruction information to the target terminal. 30. The source base station according to claim 27, wherein the second information sending module is specifically configured to send an RRC reconfiguration message to the target terminal, and carry the RRC reconfiguration message in the RRC reconfiguration message Key update instructions. 31. The source base station according to claim 27, wherein the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate key update The updated identification information carried in the data packet. 32. The source base station according to claim 31, wherein the threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number of the last data packet sent by the source base station information, or, the PDCP sequence number information of the first newly transmitted data packet sent by the target base station; And/or, the identification information includes: end maker. 33. The source base station according to any one of claims 27 to 32, wherein when the types of the source base station and the target base station are both the second base station S-eNB, the first information sending module passes the main The base station M-eNB sends the key update instruction information to the target base station, and the second information sending module sends the key update instruction information to the target terminal through the M-eNB. 34. A target base station, comprising: An information receiving module, configured to receive key update instruction information sent by the source base station; The first processing module is configured to process the first packet sent to the target terminal according to the key update instruction information after the target terminal switches into the base station from the source base station; The first sending module is configured to send the first packet processed by the first processing module to the target terminal through the service node. 35. The target base station according to claim 34, wherein the information receiving module is specifically configured to receive a handover request message sent by the source base station, and extract the key from the handover request message Update instructions. 36. The target base station according to claim 35, wherein the information receiving module is further configured to, when the target terminal is allowed to access after receiving the handover request message sent by the source base station, send The source base station sends a handover confirmation message, and the handover confirmation message carries key update instruction information that the active base station needs to send to the target terminal. 37. The target base station according to claim 34, wherein the key update indication information includes: threshold information of the PDCP sequence number of the data packet used for key update judgment, and/or, used to indicate key update The updated identification information carried in the data packet. 38. The target base station of claim 37, wherein: When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment, the first packet is the first newly transmitted data packet of the target base station; the first processing module, specifically It is used to set the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the threshold; When the key update indication information is the identification information carried in the data packet used to indicate the key update, the first packet is the retransmission data packet forwarded by the source base station to the target base station or the first packet of the target base station For a newly transmitted data packet, the first processing module is specifically configured to carry the identification information in the header of the first packet; When the key update indication information is the threshold information of the PDCP sequence number of the data packet used for key update judgment and the identification information carried in the data packet used to indicate the key update, when the first packet is the source base station When forwarding the retransmission data packet to the target base station, the first processing module is specifically configured to carry the identification information in the header of the first packet; when the first packet is the first newly transmitted data of the target base station When sending a packet, the first processing module is specifically configured to set the PDCP sequence number of the first newly transmitted data packet of the base station sent to the target terminal, so that the PDCP sequence number is greater than or equal to the threshold. 39. The target base station according to claim 37 or 38, wherein the threshold information of the PDCP sequence number of the data packet used for key update judgment includes: the PDCP sequence number of the last data packet sent by the source base station Sequence number information, or, PDCP sequence number information of the first newly transmitted data packet sent by the target base station; And/or, the identification information includes: end maker. 40. The target base station of claim 39, wherein: When the key update instruction information is the PDCP sequence number information of the last data packet sent by the source base station, the first processing module is specifically configured to use the PDCP sequence number of the first packet to be sent to the target terminal Set to add one to the PDCP sequence number of the last data packet sent by the source base station; When the key update indication information is the PDCP sequence number information of the first newly transmitted data packet sent by the target base station, the first processing module is specifically used to set the first packet to be sent to the target terminal The PDCP sequence number is set as the PDCP sequence number of the first newly transmitted data packet sent by the target base station; the first packet is the first newly transmitted data packet of the target base station.