CN101227740A - A method, system and device for accessing SAE core network - Google Patents

Abstract

The embodiment of the present invention discloses a method for accessing a system architecture evolution core network, including: a mobility management entity in the system architecture evolution core network completes a network attachment operation for a terminal accessing a general wireless communication system terrestrial wireless access network After that, send a packet data protocol context activation request to the terrestrial wireless access network of the general wireless communication system, and initiate a packet data protocol activation process; in the packet data protocol activation process, the system architecture evolution core network is used to access the A terminal on the terrestrial radio access network of the wireless communication system creates a default bearer. The embodiment of the invention correspondingly discloses a network system and a mobility management entity. A default bearer can be established for terminals accessing the terrestrial wireless access network of the general wireless communication system to provide an always-on function.

Description

A method, system and device for accessing SAE core network

technical field

The present invention relates to the field of system architecture evolution (System Architecture Evolution, SAE), in particular to a method, system and device for accessing the SAE core network.

Background technique

With the development of the SAE architecture system, operators will use SAE equipment to provide services in the future, so that users can enjoy better services. The current System Architecture Evolution/Long Term Evolution (SAE/LTE) architecture includes the LTE access network (eNodeB) and the SAE core network. Among them, the SAE core network mainly includes the Mobility Management Entity (Mobility Management Entity, MME), Serving SAE Gateway (Serving SAE Gateway, S-GW) and Packet Data Network SAE Gateway (PDN SAE Gateway, P-GW). At the same time, in the transition process of this development, it is necessary to access the original 2G/3G mobile network by using the SAE core network. However, in its current SAE architecture, the Serving GPRS Support Node (SGSN) equipment in the original 2G/3G mobile network is connected to the original 2G/3G mobile network through the SAE core network, so as to access the original 2G/3G network. Network access, in which GPRS is a General Packet Radio Service (GPRS) technology. So in fact, in this application, there is still a complete 2G/3G mobile network and SAE/LTE network.

The existing network architecture of this kind can be referred to as shown in FIG. 1 . Wherein, the MME accesses the SGSN through the S3 interface, the S-GW accesses the SGSN through the S4 interface, and accesses the UTRAN network through the S12 interface. The S12 interface is mainly used as the Iu-U interface in the direct tunnel (Direct Tunnel) scenario to provide the user plane function of the Iu interface, and the Iu-C interface is still provided through the SGSN. The access processing of UMTS Terrestrial Radio Access Network/GSM EDGE Radio Access Network (UMTS Terrestrial Radio Access Network/GSMEDGE Radio Access Network, UTRAN/GERAN) still depends on SGSN. Among them, UMTS is the abbreviation of Universal Mobile Telecommunications System (Universal Mobile Telecommunications System). EDGE is the abbreviation of Enhanced Data Rate for GSM Evolution. If the operator uses the above architecture to realize the operation of multiple access networks, it still needs to maintain two sets of core network equipment (SAE MME/GW and UMTS/GPRS SGSN).

And some operators hope to use SAE core network equipment to upgrade the original 2G/3G core network, access the previous access network equipment, and provide unified services for various accesses through the SAE core network.

The inventor found in the process of realizing the present invention that the existing architecture in Fig. 1 has the following deficiencies:

The process of UMTS terminals accessing the SAE core network still needs to follow the UMTS architecture system. In this method, UMTS terminals cannot directly access the SAE core network through UTRAN.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a method, system and device for accessing the SAE core network, so that UMTS terminals can directly access access to the SAE core network, and can trigger the SAE core network to establish a default bearer for the terminal, and can provide an always-on function for the UMTS terminal.

A method for accessing a system architecture evolution core network, which is implemented in a system including a general wireless communication system terrestrial radio access network and a system architecture evolution core network, and the general wireless communication system terrestrial radio access network respectively through interfaces Directly connected with the service gateway in the evolution core network of the system architecture, the method includes the following steps:

The mobility management entity is performing a network attachment operation for a terminal accessing the terrestrial radio access network of the universal wireless communication system;

The mobility management entity sends a packet data protocol context activation request to the general wireless communication system terrestrial radio access network, and initiates a packet data protocol activation process; creates a default bearer.

A network system, comprising a general wireless communication system terrestrial wireless access network and a system architecture evolution core network, the general wireless communication system terrestrial wireless access network directly communicates with the mobility management system in the system architecture evolution core network respectively through interfaces The entity is connected to the serving gateway, and the mobility management entity establishes a default bearer for terminals accessing the terrestrial radio access network of the general wireless communication system.

A mobility management entity is used in a network system in which a terminal directly accesses a system architecture evolution core network through a general wireless communication system terrestrial wireless access network, including:

The first trigger unit is configured to generate a trigger signal when it is detected that a default bearer condition is established for a terminal accessing the general wireless communication system terrestrial wireless access network;

A packet data protocol context activation request unit, configured to send a packet data protocol context activation request to the general wireless communication system terrestrial radio access network under the trigger of the first trigger unit, and initiate a packet data protocol activation process;

The default bearer establishment processing unit is configured to create a default bearer for the terminal in the packet data protocol activation process initiated by the packet data protocol context activation request unit.

A method, network system, and device for accessing the SAE core network according to an embodiment of the present invention, by directly combining the UTRAN access network with the SAE core network, the SAE core can establish a default bearer for UMTS terminals, thereby providing UMTS terminals with The always-on function is provided to facilitate the provision of corresponding services on the SAE network side for UMTS terminals.

In addition, UMTS terminals can directly access the SAE core network through UTRAN, without going through UMTS core network equipment such as SGSN, and no longer need to maintain two core network equipment, which reduces the difficulty of maintenance and reduces maintenance costs; moreover, no need to change The UMTS access network and UMTS terminals can be connected to the SAE core network, so that the SAE core network can be easily directly compatible with the existing UMTS access network and UMTS terminals.

Description of drawings

FIG. 1 is a schematic diagram of a system architecture combining a UMTS network and an SAE/LTE network in the prior art;

Fig. 2 is a schematic structural diagram of an embodiment of the network system of the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of the MME in FIG. 2;

Fig. 4 is a schematic structural diagram of an embodiment of a default bearer establishment processing unit in Fig. 3;

FIG. 5 is a schematic structural diagram of another embodiment of the MME in FIG. 2;

FIG. 6 is a schematic flowchart of an embodiment of a method for accessing a system architecture evolution core network according to the present invention;

Fig. 7 is a schematic flow chart of another embodiment of the method for accessing a core network with evolved system architecture according to the present invention.

Detailed ways

The embodiment of the present invention proposes a method, system and device for accessing the SAE core network. Through the SAE core network, a terminal accessing UTRAN is directly provided with an access service, and a default bearer is established for the terminal, thereby providing UMTS users with The always-on function is used to provide more services on the SAE network side.

The present invention will be described in detail below with preferred embodiments in conjunction with the accompanying drawings.

As shown in FIG. 2 , it is an architecture diagram of the network system in the embodiment of the present invention. It can be seen that the network system includes:

The UMTS access network (UTRAN) and the SAE core network connected to said UTRAN. A user terminal (MS, not shown) accesses the SAE core network through the UTRAN.

The SAE core network includes a Mobility Management Entity (MME), a Serving Gateway (Server SAEGateway, S-GW), and a Packet Data Network Gateway (PDN SAE Gateway, P-GW).

Wherein, the MME supports the access processing of the UTRAN network by providing the Iu interface; the S-GW provides the S12 interface (ie, the Iu-U interface) to support the user plane access processing of the UTRAN network.

Of course, the network system further includes: LTE side equipment, evolved UTRAN (EvolvedUTRAN, E-UTRAN) and user terminals (UE) accessing the E-UTRAN; and Home Subscriber Server/Home Location Register (Home Subscriber Server/Home location Register, HSS/HLR); Policy Control and Charging Rule Function (Policy Control and Charging Rule Function, PCRF) entity and other SAE/LTE architecture network equipment.

In the SAE core network, the MME can receive a network attachment request sent from a terminal (corresponding to a UMTS access user) via UTRAN, and attach the terminal to the SAE network. After performing the network attachment operation, the MME initiates PDP context activation process on the network side. In the process of activating the PDP context, a default bearer is created for the terminal, so as to provide the terminal with an always-on function. In addition, after the SAE network establishes a default bearer for the terminal, the network side can initiate the process of establishing a dedicated bearer. At this time, when the MME receives a request for creating a dedicated bearer from the S-GW in the SAE core network, it initiates the process of establishing a dedicated bearer on the network side. In the PDP activation process, the terminal (MS) is notified to establish a PDP context. In this process, a dedicated bearer is established for the terminal.

Referring to FIG. 3 , it is a schematic diagram of an embodiment of the MME in FIG. 2 . The MME includes:

The first trigger unit 10 is configured to generate a trigger signal to start the process of establishing a default bearer when it is detected that the conditions for establishing a default bearer for a terminal accessing UTRAN are satisfied, specifically, when the MME receives a message from the terminal After the network attachment request of the terminal is completed and the network attachment operation is performed for the terminal, the process of establishing the default bearer can be started;

A packet data protocol (PDP) context activation request unit 12, configured to send a packet data protocol (PDP) context activation request to UTRAN under the trigger of the first trigger unit 10, and initiate a PDP activation process;

The default bearer establishment processing unit 14 is configured to create a default bearer for the terminal in the PDP activation process initiated by the packet data protocol (PDP) context activation request unit.

Specifically, creating a default bearer for the terminal includes the following process:

After initiating the PDP activation process and receiving the activation PDP context request from the MS, the MME sends a request to establish a default bearer context to the S-GW and routes it to the P-GW;

The PCRF assigns a PCC policy to the default bearer of the request;

The P-GW sends a response to establish a default bearer context to the S-GW, and the S-GW also sends a response to the MME to establish a default bearer context;

The MME will negotiate with the UTRAN and request the UTRAN to allocate a RAB (radio access bearer), and then the UTRAN will establish a radio access bearer for the access terminal.

The MME will send information such as the IP address assigned to the terminal by the SAE network to the terminal in the activation PDP context acceptance message, so that the SAE core network can establish a default bearer for the terminal.

Please refer to FIG. 4, which is a schematic diagram of an embodiment of the default bearer establishment processing unit in FIG. 3; the default bearer establishment processing unit 14 may include:

The default bearer request unit 140 is configured to send a request message to create a default bearer context to the S-GW in the SAE core network, requesting to create a default bearer; the request message may include information such as the client identification number of the terminal, the MME context identifier, RAT type, default bearer quality of service and other information;

The default bearer receiving unit 142 is configured to receive a default bearer creation response message from the S-GW after the P-GW in the SAE core network creates a default bearer according to the request, and the response message includes a PDN address Information, S-GW user plane address, S-GW user plane TEID, S-GW context identifier and other information.

The negotiating unit 144 is configured to negotiate with the UTRAN according to the received create default bearer response message, and allocate a radio access bearer corresponding to the default bearer for the terminal.

Referring to FIG. 5 , it is a schematic diagram of another embodiment of the MME in FIG. 2 . The MME may further include:

The second trigger unit 16 is configured to generate a trigger signal to start the process of establishing a dedicated bearer when it is detected that the conditions for establishing a dedicated bearer for a terminal accessing the UTRAN are met; specifically, when the MME receives a creation request from the P-GW After the dedicated bearer is requested, the process of establishing a dedicated bearer for the terminal can be started.

The dedicated bearer may be a bearer established for a call. When a terminal initiates a call, according to the default bearer established by the method for accessing the SAE core network described in the above embodiment, the terminal can quickly establish a bearer for a call. The dedicated channel for communication is the dedicated bearer mentioned here.

At this time, the packet data protocol context activation request unit 12 sends a packet data protocol (PDP) context activation request to UTRAN under the trigger of the second trigger unit 16, and initiates a packet data protocol (PDP) activation process.

A dedicated bearer establishment processing unit 18, configured to create a dedicated bearer for the terminal in the PDP activation process initiated by the PDP context activation request unit.

Specifically, creating a dedicated bearer for the terminal includes the following procedures:

The MME receives the request for creating a dedicated bearer context from the S-GW, and the request already includes information such as the PCC strategy allocated by the PCRF for the dedicated bearer;

The MME initiates a PDP context activation request process, and after receiving the PDP context activation request message from the terminal accessing the UTRAN, sends a RAB arrangement request message to the UTRAN to request the UTRAN to establish a radio bearer.

After receiving the RAB Arrangement Response message from UTRAN, the MME sends a Create Dedicated Bearer Response message to the S-GW. After that, the MME can send an Activate PDP Context Accept message to the terminal, including the IP address allocated for the dedicated bearer and other information.

In this way, the establishment of a dedicated bearer for the terminal is completed.

It can be understood that the MME may include the first trigger unit 10 , the PDP context activation request unit 12 , the default bearer establishment processing unit 14 , the second trigger unit 16 and the dedicated bearer establishment processing unit 18 .

It can be understood that the MME may also include a processing unit with other functions, such as a unit for performing network attachment operations, and other functional units responsible for mobility management of the control plane, which will not be described in detail here.

The following describes the more detailed process of establishing a default bearer and a dedicated bearer for a terminal in the present invention through specific embodiments.

As shown in FIG. 6 , it is a schematic flowchart of an embodiment of the method for accessing the SAE core network in the present invention.

Steps S61-64, when the terminal (MS) finds the UTRAN access network when it is turned on, for example, it needs to perform a network attachment request, and it sends the attachment request (Attach Request) to the MME in the SAE core network through the UTRAN, and the MME Process the attach request, where the attach request may include previously registered information (such as a temporary identifier) or its permanent identifier; the process of processing the attach request may include terminal identity acquisition process, authentication process, security negotiation process, and the processing of the location update process. After completing the network attach operation, the MME issues an Attach Accept (AttachAccept) to the terminal.

Steps S65-66. After completing the network attachment operation of the terminal, the MME initiates a PDP context activation process on the network side, sends a request PDP context activation (Request PDP CONTEXT Activate) message to the terminal, and requests the terminal (MS) to establish a PDP context.

Steps S67～68, the terminal (MS) sends an activation PDP context request (Activate PDPCONTEXT Request) message to the MME, and the MME performs the PDP context creation process, according to the local configuration or the default bearer information obtained from the HSS/HLR (such as the default IP Access bearer subscription information, etc.), initiate the default bearer creation process.

Step S69, according to the principles of network topology, load balancing, etc., the MME selects an S-GW, and sends a Create Default Bearer Context Request (Create Default Bearer Context Request) message to the selected S-GW, which may include information such as Terminal customer identification number (IMSI), MME context identifier (MME Context ID), RAT type (RAT type), default bearer quality of service (Default Bearer QoS), PDN address allocation (PDN Address Allocation), data rate upper limit ( AMBR) and other information to request to create a default bearer.

Step S610, the S-GW sends a create default bearer context request (Create Default BearerContext Request) message to the P-GW in the SAE core network. The message may include, for example, S-GW user plane address (Serving GW Address for the user plane), S-GW user plane TEID (Serving GW TEID of the user plane), S-GW control plane tunnel end identifier (Serving GWTEID of the control plane), RAT type (RAT type), default bearer quality of service (DefaultBearer QoS), PDN address allocation (PDN Address Allocation) and data rate upper limit (AMBR) and other information.

In steps S611-612, the P-GW interacts with the Policy Control and Charging Rules Function (PCRF) to request the Policy Control and Charging (PCC) rules of the default bearer.

In step S613, the P-GW creates a default bearer according to the PCC rules delivered by the PCRF, and sends a create default bearer response (Create Default Bearer Response) message to the S-GW. Wherein, the message may include such as P-GW user plane address (PDN GW Address for the user plane), P-GW user plane TEID (PDN GW TEID of the user plane), P-GW control plane TEID (PDN GWTEID of the user plane) control plane), PDN address information (PDN Address Information) and other information.

Step S614, the S-GW updates the P-GW information in the received default bearer creation response message from the P-GW to its default bearer forwarding table, and issues a create default bearer response (CreateDefault Bearer Response) message to MME. The message may include, for example, PDN address information (PDN Address Information), S-GW user plane address (Serving GW address for UserPlane0, S-GW user plane TEID (Serving GW TEID for User Plane), S-GW context identifier ( Serving GW Context ID) and other information.

In steps S615-616, the MME sends a radio access bearer arrangement request (RABAssignment Request) message to the UTRAN, requesting the UTRAN to arrange a radio bearer. The message may carry information such as quality of service (QOS) parameters of the bearer, user plane address and user plane TEID of the S-GW.

Steps S617-618: After establishing the radio bearer, the UTRAN sends a radio access bearer arrangement response (RAB Assignment Response) message to the MME, which carries information such as the user plane address and TEID of the UTRAN.

In steps S619-620, the MME sends an Update Bearer Context Request (Update Bearer ContextRequest) message to the S-GW, carrying information such as the user plane address and TEID of the UTRAN. After updating the information, the S-GW returns an Update Bearer Context Response (Update Bearer Context Response) message to the MME.

In steps S621-622, the MME sends an Activate PDP Context Accept (Activate PDPCONTEXT Accept) message to the terminal (MS), which carries information such as QOS parameters and the IP address allocated by the P-GW.

In steps S623-624, the MME sends an update location request (Update LocationRequest) message to the HSS/HLR, for updating the address information of the P-GW into the HLR/HSS. After completing the updating of the address information, the HSS/HLR returns an Update Location Response (Update Location Response) message to the MME.

In this way, the terminal (MS) obtains an IP address and establishes a bearer connection to perform service communication.

As shown in FIG. 7 , it is a schematic flowchart of another embodiment of the method for accessing the SAE core network through UMTS in the present invention.

Step S71 , the policy control and charging rule function entity (PCRF) issues the PCC policy to the P-GW, and transmits bearer-related policy and charging control information to the P-GW.

Step S72, P-GW acquires the QOS parameters of the corresponding bearer according to the PCC policy, and sends a Create Dedicated Bearer Context Request (Create Dedicated Bearer Context Request) message to the S-GW, which may carry the quality of service (Bearer QoS ) parameters, UL TFT and S5/S8TEID.

Step S73, the S-GW creates a local bearer, and sends a Create Dedicated Bearer Context Request (CreateDedicated Bearer Context Request) message to the MME, which carries bearer quality of service (Bearer QOS) parameters, ULTFT and TEID allocated by the S-GW.

Step S74, MME initiates a request PDP context activation process, and sends a request PDP context activation (Request PDP CONTEXT Activate) message to the terminal (MS), which carries information such as TI, UL TFT, and terminal IP address (MS IP Address).

Step S75, the terminal (MS) initiates a PDP context activation process, that is, sends an Activate PDP Context Request (Activate PDP Context Request) message to the MME through UTRAN.

Steps S76-S79, after the MME receives the Activation PDP Context Request message from the MS, it initiates a Radio Access Bearer Arrangement Request (RAB Assignment Request) message to the UTRAN, in which the message carries the bearer quality of service (Bearer QOS) parameter, S-GW Assigned TEID and other information. After the radio bearer is established, the UTRAN returns a radio access bearer arrangement response (RAB Assignment Response) message, carrying information such as the TEID allocated by the UTRAN.

Step S710, the MME sends a Create Dedicated Bearer Response (Create Dedicated Bearer Response) message to the S-GW, and the message carries information such as the TEID allocated by the UTRAN.

In step S711 and step S713, the MME simultaneously sends an Activate PDP Context Accept (Activate PDPContext Accept) message to the terminal (MS), which includes information such as the allocated IP address.

Step S712, S-GW updates the local bearer context according to the TEID information in the Create Dedicated Bearer Response message sent by the MME, and sends a Create Dedicated Bearer Response (Create Dedicated Bearer Response) message to the P-GW.

In step S714, the P-GW sends a PCC Decision Provision Ack (PCC Decision Provision Ack) message to the PCRF, thereby completing the process of establishing a dedicated bearer.

Similarly, the terminal (MS) obtains an IP address and establishes a dedicated bearer connection for service communication.

It should be noted that, all the above examples and descriptions are described with the terminal accessing the SAE core network through the UTRAN. Of course, in this network system, the terminal can also access the SAE core network through the LTE access network (such as E-UTRAN), that is, the MME in the SAE core network has the function of processing both LTE access and UMTS access.

The method, system, and device provided by the embodiments of the present invention enable the SAE core network to establish a default bearer for UMTS terminals by combining the UTRAN access network with the SAE core network, and can provide an always-on function for UMTS terminals, facilitating Provide corresponding services on the SAE network side for UMTS terminals.

In addition, UMTS terminals can directly access the SAE core network through UTRAN without going through UMTS core network equipment such as SGSN, and no longer need to maintain two core network equipment, which reduces the difficulty of maintenance and reduces maintenance costs; and , without changing the UMTS access network and UMTS terminals, it can access the SAE core network, so that the SAE core network can be easily directly compatible with the existing UMTS access network and UMTS terminals.

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

Claims (21)

1. A method for accessing a system architecture evolution core network, which is implemented in a system including a general wireless communication system terrestrial wireless access network and a system architecture evolution core network, wherein the general wireless communication system terrestrial wireless The access network is directly connected to the service gateway in the system architecture evolution core network through an interface, and the method includes the following steps: The mobility management entity is performing a network attachment operation for a terminal accessing the terrestrial radio access network of the universal wireless communication system; The mobility management entity sends a packet data protocol context activation request to the general wireless communication system terrestrial radio access network, and initiates a packet data protocol activation process; creates a default bearer. 2. The method according to claim 1, wherein the step of creating a default bearer for a terminal accessing the Universal Wireless Communication System Terrestrial Radio Access Network comprises: The mobility management entity sends a request to establish a default bearer context to the serving gateway in the core network of the system architecture evolution, and routes the request to the packet data network gateway. 3. The method of claim 2, further comprising: The creating a default bearer for terminals accessing the terrestrial wireless access network of the general wireless communication system further includes: The packet data network gateway interacts with the policy control and charging rule functional entity to request the policy control and charging rules of the default bearer; After the policy control and charging rule functional entity issues policy control and charging information for the requested default bearer, the packet data network gateway sends a response to establish a default bearer to the serving gateway, and routes it to the Mobility Management Entity; The mobility management entity negotiates with the terrestrial radio access network of the universal wireless communication system, and the terrestrial radio access network of the universal wireless communication system establishes a radio bearer for the terminal. 4. The method according to claim 1, wherein the mobility management entity in the system architecture evolution core network performs a network attachment operation for a terminal accessing the Universal Wireless Communications System Terrestrial Radio Access Network Further includes: The terminal sends an attach request to a mobility management entity through a universal wireless communication system terrestrial radio access network; The mobility management entity performs a network attach operation and sends an attach accept message to the terminal. 5. The method according to any one of claims 3 to 4, characterized in that, after the system architecture evolution core network creates a default bearer for terminals accessing the Universal Wireless Communication System Terrestrial Radio Access Network, further include: A dedicated bearer is created for the terminal under the trigger of the network side. 6. The method according to claim 5, wherein the step of creating a dedicated bearer for the terminal under the trigger of the network side comprises: After the mobility management entity receives the request for creating a dedicated bearer from the service gateway in the system architecture evolution core network, it sends a packet data protocol context activation request to the general wireless communication system terrestrial radio access network, and initiates a packet data protocol activation process; The mobility management entity negotiates with the Universal Wireless Communications System Terrestrial Radio Access Network after receiving the packet data protocol context activation request from the terminal; The terrestrial wireless access network of the universal wireless communication system establishes a radio bearer for the terminal; The mobility management entity sends a create dedicated bearer response to the serving gateway. 7. The method according to claim 6, wherein the mobility management entity further comprises: The policy control and charging rule functional entity in the core network of the evolution of the system architecture delivers the policy and charging control information related to the dedicated bearer to the packet data network gateway. 8. The method according to any one of claims 1 to 3, further comprising: After creating the default bearer, the mobility management entity sends an Activation Packet Data Protocol Context Accept message to the terminal, where the Activation Packet Data Protocol Context Accept message includes IP address information allocated for the terminal. 9. A network system, comprising a general wireless communication system terrestrial wireless access network and a system architecture evolution core network, characterized in that: The terrestrial wireless access network of the general wireless communication system is directly connected to the mobility management entity and the serving gateway in the core network of the system architecture evolution through interfaces, and the mobility management entity is used for accessing the terrestrial network of the general wireless communication system. Terminals on the radio access network establish default bearers. 10. The network system according to claim 9, wherein the mobility management entity comprises: The first trigger unit is configured to generate a trigger signal when it is detected that the condition for establishing a default bearer for a terminal accessing the terrestrial radio access network of the general wireless communication system is met; A packet data protocol context activation request unit, configured to send a packet data protocol context activation request to the general wireless communication system terrestrial radio access network under the trigger of the first trigger unit, and initiate a packet data protocol activation process; The default bearer establishment processing unit is configured to create a default bearer for the terminal in the packet data protocol activation process initiated by the packet data protocol context activation request unit. 11. The network system according to claim 9, wherein the condition for satisfying the establishment of a default bearer for a terminal accessing the terrestrial wireless access network of the general wireless communication system is specifically: receiving an attach message from the terminal request, and completes the network attach operation. 12. The network system according to claim 10, wherein the default bearer establishment processing unit further comprises: A default bearer request unit, configured to send a request to create a default bearer context to the serving gateway in the core network for the evolution of the system architecture; The default bearer receiving unit is configured to receive a response message of creating a default bearer from the service gateway. 13. The network system according to claim 12, wherein the default bearer establishment processing unit further comprises: The negotiating unit is configured to negotiate with the terrestrial wireless access network of the access universal wireless communication system according to the create default bearer response message, and allocate a radio access bearer corresponding to the default bearer for the terminal. 14. The network system according to any one of claims 9 to 13, wherein the mobility management entity further comprises: The second trigger unit is configured to generate a trigger signal when it is detected that a dedicated bearer condition is established for a terminal accessing the terrestrial wireless access network of the general wireless communication system; The packet data protocol context activation request unit, triggered by the second trigger unit, sends a packet data protocol context activation request to the general wireless communication system terrestrial radio access network, and initiates a packet data protocol activation process; A dedicated bearer establishment processing unit, configured to create a dedicated bearer for the terminal in the packet data protocol activation process initiated by the packet data protocol context activation request unit. 15. The network system according to claim 12, characterized in that, The condition for establishing a dedicated bearer for a terminal accessing the terrestrial wireless access network of the general wireless communication system specifically includes: receiving a request for establishing a dedicated bearer from the system architecture evolution core network. 16. A mobility management entity, used in a network system in which a terminal directly accesses a system architecture evolution core network through a general wireless communication system terrestrial wireless access network, characterized in that it includes: The first trigger unit is configured to generate a trigger signal when it is detected that a default bearer condition is established for a terminal accessing the general wireless communication system terrestrial wireless access network; A packet data protocol context activation request unit, configured to send a packet data protocol context activation request to the general wireless communication system terrestrial radio access network under the trigger of the first trigger unit, and initiate a packet data protocol activation process; The default bearer establishment processing unit is configured to create a default bearer for the terminal in the packet data protocol activation process initiated by the packet data protocol context activation request unit. 17. The mobility management entity according to claim 16, wherein the establishment of a default bearer condition for a terminal accessing the terrestrial radio access network of the Universal Wireless Communications System is specifically: receiving a network message from the terminal Attach request and complete the network attach operation. 18. The mobility management entity according to claim 17, wherein the default bearer establishment processing unit further comprises: A default bearer request unit, configured to send a request to create a default bearer context to the serving gateway in the core network for the evolution of the system architecture; The default bearer receiving unit is configured to receive a response message of creating a default bearer from the service gateway. 19. The mobility management entity according to claim 18, wherein the default bearer establishment processing unit further comprises: The negotiating unit is configured to negotiate with the terrestrial wireless access network of the access universal wireless communication system according to the create default bearer response message, and allocate a radio access bearer corresponding to the default bearer for the terminal. 20. The mobility management entity according to any one of claims 16 to 19, further comprising: The second trigger unit is configured to generate a trigger signal when it is detected that a dedicated bearer condition is established for a terminal accessing the terrestrial wireless access network of the general wireless communication system; The dedicated bearer establishment processing unit is used for the packet data protocol context activation request unit to be triggered by the second trigger unit to send a packet data protocol context activation request to the general wireless communication system terrestrial radio access network, and initiate packet data protocol activation During the procedure, a dedicated bearer is created for the terminal. 21. The mobility management entity according to claim 20, wherein the condition for establishing a dedicated bearer for a terminal accessing the terrestrial wireless access network of the general wireless communication system is specifically: receiving a message from the system architecture evolution core network Dedicated bearer establishment request.

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