CN101299696B - Mobile LAN and method for implementing service continuity - Google Patents

Abstract

The invention discloses a mobile local area network and a method for realizing service continuity thereof, wherein the mobile local area network conducts business with the service network according to the current first communication link based on the first protocol; when the mobile local area network finds When the own communication capability cannot meet the communication requirement, determine the target communication link based on the second protocol; and switch the current communication link to the target communication link. Through the invention, the mobile local area network can provide support for business continuity in wireless networks of different media types, and realize seamless switching.

Description

Mobile Local Area Network and Its Method of Realizing Business Continuity

technical field

The invention relates to the communication field, in particular to the technology for realizing the continuity of mobile local area services.

Background technique

With the development of communication technology, the reality that various types of media networks coexist in a certain service area has emerged, and multi-mode terminal devices that can simultaneously support communication with various networks have also emerged along with user needs. Due to the differences in service areas and service capabilities of different networks, users hope to use their own terminal equipment to realize seamless switching between different types of media networks, so as to ensure the continuity of their own services. In response to such requirements, the 802.21 protocol proposes a framework for realizing media-independent switching services for multi-mode terminals, as shown in Figure 1, it can be seen that it is in the second layer (MAC layer) and third layer ( A media-independent handover layer is added between the network layer), and interfaces between this layer and the upper and lower layers of the protocol stack, NMS (network management system) and MIH (media-independent handover) entities of the same layer are defined, through which media-independent handover The layer provides events, commands, and information services for multi-mode terminals to realize seamless switching between different types of media networks.

A mobile local area network is a local area network in a mobile environment, which includes various types of equipment. These devices form a local area network in a mobile environment in a star, ring or Ad hoc (ad hoc network) structure through wireless and wired modes. For example, in order to carry out a multi-party conference on a driving car, the audio and video equipment of each conference participant in the car is formed into an in-car local area network.

When the mobile local area network implements services, it needs to be connected to the wireless communication network in the surrounding area, that is, the wide area network, and further connected to its own enterprise network or other mobile local area networks. For this reason, the mobile local area network includes at least one wireless access device with wireless access capability, and a local area gateway device (which can be a physically independent device or subordinate to a certain wireless network) for controlling and managing the internal devices of the mobile local area network. Logical gateway device of the access device). The wireless access device provides a communication link to the wide area network for the equipment in the mobile local area network, that is, it is responsible for the protocol conversion between the equipment in the mobile local area network and the wide area network, and realizes the data interaction between the two based on the protocol conversion function On the one hand, the local area gateway device forwards the data packet received by the wireless access device from the wide area network to the device inside the mobile local area network, and at the same time sends the data packet sent by the device inside the mobile local area network to the wireless access device. into the device.

In order to ensure the continuity of the mobile local area network service during the movement, the prior art method is usually: when the mobile local area network is in a service area covered by a certain type of wireless network, the mobile local area network passes through the gateway device and The wireless access device establishes a communication link with the wireless network covering the service area, and further accesses its own enterprise network or local area network in other mobile environments; when the mobile local area network moves to another wireless network of the same type When within the service area, through the switching mechanism jointly supported by the wireless access device and the wireless network, the wireless access device performs seamless switching between different service areas of the wireless network, thereby ensuring the continuity of the service of the device in the mobile local area network sex.

It can be seen from the existing technology that the existing mobile local area network can provide support for business continuity in different service areas covered by the same type of media network, but it cannot provide support when it moves between wireless networks of different media types. Support for business continuity.

Contents of the invention

Embodiments of the present invention provide a mobile local area network and a method for realizing service continuity thereof, which enable the mobile local area network to provide support for service continuity in wireless networks of different media types and realize seamless switching.

Embodiments of the present invention are achieved through the following technical solutions:

An embodiment of the present invention provides a method for implementing service continuity in a mobile local area network, which includes:

The mobile local area network performs services with the service network according to the current first communication link based on the first protocol;

When the mobile local area network finds that its own communication capabilities cannot meet the communication requirements, the mobile local area network has a multi-mode access device that supports the wireless access capabilities of the first access network and the second access network to find a target access network;

A multi-mode access device in the mobile local area network that supports the wireless access capability of the first access network and the second access network, according to relevant information obtained by the first access network currently serving the multi-mode access device, selects The handover target access network is the second access network;

Send a switching instruction to the second access network and the second media type link layer of the multi-mode access device communication protocol stack through the media-independent handover layer of the multi-mode access device communication protocol stack; receiving The media-independent handover layer of the POA equipment communication protocol stack of the second access network access point indicated by the handover, relays the handover indication to the link layer of the POA equipment communication protocol stack of the second access network;

The link layer of the communication protocol stack of the POA device of the second access network that receives the handover instruction, and the second media type link layer of the communication protocol stack of the multi-mode access device, based on the second access network protocol A link establishment command, establishing a target communication link between the mobile local area network and the second access network.

The embodiment of the present invention also provides a mobile local area network, including at least one terminal device, at least one of the terminal devices has a multi-mode access function, and is used to send a switching request to find a target when it finds that its own communication capability cannot meet the communication requirements Accessing the network, selecting the target access network for switching according to the relevant information obtained by the current access network, sending a switching instruction to the POA device of the target access network; relaying the communication of the switching instruction to the POA device of the target access network protocol stack link layer; the POA device of the target access network receives the handover instruction, communicates with the terminal device with multi-mode access function on the second media type link layer of the protocol stack, based on the second protocol The link establishment command to establish the target communication link.

The embodiment of the present invention also provides another mobile local area network, including a plurality of terminal devices, at least one of the terminal devices has the access capability supporting the first access network, and at least one of the terminal devices has the access capability supporting the second access network. Capabilities The terminal device having the access capability to support the first access network includes;

The link layer entity of the first media type communication protocol stack, the media-independent switching layer entity of the communication protocol stack and the upper layer entity of the communication protocol stack;

The link layer entity of the communication protocol stack of the first media type is used to issue a switching request when it finds that its own communication capability cannot meet the communication requirements, and transfer it to the communication link layer entity through the irrelevant switching layer entity of the communication protocol stack. The upper layer entity of the protocol stack;

The upper layer entity of the communication protocol stack is configured to, after receiving the switching request, select the switching target access network as the second access network according to relevant information obtained from the current access network, and pass the communication protocol stack The media-independent handover layer entity notifies the link layer entity of the first media type communication protocol stack;

The link layer entity of the communication protocol stack of the first media type performs a capability query through the media-independent handover layer entity of the communication protocol stack, and obtains information that can access the second access network according to the obtained capability query result. Terminal Equipment;

The media-independent handover layer entity of the communication protocol stack sends a handover instruction to the second access device and the second access network access point POA device.

It can be seen from the specific implementation solutions provided by the above-mentioned embodiments of the present invention that when the mobile local area network finds that its own communication capabilities cannot meet the communication requirements, it determines the target communication link based on the second protocol; and switches the current communication link to the target communication link, thus, the mobile local area network can provide support for business continuity in wireless networks of different media types.

Description of drawings

Fig. 1 is the 802.21 agreement frame diagram that background technology provides;

Fig. 2 is the flowchart of the first embodiment of the present invention;

FIG. 3 is a flow chart of realizing service continuity of a mobile local area network through a multi-mode terminal device C in the first embodiment of the present invention;

Fig. 4 is the flowchart in the second embodiment of the present invention;

FIG. 5 is a flow chart of realizing service continuity of a mobile local area network through terminal equipment A and terminal equipment B in the second embodiment of the present invention;

FIG. 6 is a structural diagram of a third embodiment provided by the present invention;

Fig. 7 is a structural diagram of a fourth embodiment provided by the present invention.

Detailed ways

The first embodiment provided by the present invention is a method for realizing service continuity of a mobile local area network. When the mobile local area network moves within service areas covered by different media types, it simultaneously supports the first access network communication function and supports the second 2. Multi-mode access equipment with access to network communication functions, such as multi-mode terminal equipment, to realize the continuity of ongoing services of the equipment within it. The process is shown in Figure 2, including:

Step S101, the mobile local area network accesses the first access network based on the first communication link of the first protocol through a multi-mode access device capable of supporting wireless access to the first access network, and according to the communication with the first access network - Access to the information exchanged by the network, and conduct business with the service network.

When the mobile local area network is in the service area of the first access network, the first protocol communication mode supported by the access equipment in the mobile local area network is used as an uplink access mode for other terminal devices in the mobile local area network to access The wide area network provides the first communication link. Due to the influence of factors such as the movement of the location of the mobile local area network and the environment, the uplink access capability of the first communication mode of the multi-mode access device is reduced, so that the uplink access capability cannot meet the requirements of the terminal equipment in the mobile local area network. Communication needs. At this point, the multi-mode access device determines a target communication link based on the second protocol; and switches the current communication link to the target communication link. details as follows:

Step S102, finding that the first communication link cannot meet the communication requirements of the terminal equipment in the mobile local area network, and searching Target access network; according to the found target access network, establish a target communication link based on the second protocol between the mobile local area network and the target access network, and switch the current communication link to the target communication link.

In step S102, the first media type link layer of the communication protocol stack supporting the communication function of the first access network in the multi-mode access device finds that the uplink access capability of the first communication mode based on the first protocol is degraded, Insufficient to meet the communication needs of the terminal equipment in the mobile local area network, just send a switching request to the communication protocol stack media-independent switching layer of the multi-mode access device, and the communication protocol stack media-independent switching layer further transmits the request to the communication protocol stack The upper layer, the upper layer of the communication protocol stack performs a handover decision according to the relevant information obtained by the POA (Point of Attachments, access point) device of the first access network currently serving, and selects the POA of the handover target access network, assuming a second access network;

After the upper layer of the multi-mode access device makes a handover decision, it feeds back a handover request response to the first media type link layer of the communication protocol stack that sends the handover request through the media-independent handover layer. At the same time, the media-independent handover layer of the communication protocol stack sends a handover instruction to the second media type link layer of the communication protocol stack supporting the second access network communication function and the media-independent handover layer of the communication protocol stack in the current service POA, and then the current The media-independent handover layer in the serving POA sends a handover instruction to the communication protocol stack link layer in the current serving POA that supports the communication function of the first access network and the communication protocol stack media-independent handover layer in the target POA, and further the target The media-independent handover layer of the communication protocol stack in the POA notifies the link layer of the communication protocol stack with the function of supporting the communication of the second access network in the target POA of the indication;

Between the second media type link layer of the communication protocol stack of the multi-mode access device receiving the handover instruction and the communication protocol stack link layer of the target POA, a link establishment command of the second protocol is used to establish the connection between the mobile local area network and the second accessing a second communication link between the networks, the target communication link;

After the second communication link is established, the second media type link layer of the communication protocol stack in the multi-mode access device and the communication protocol stack link layer of the target POA, through the second communication link based on the second protocol The establishment of the path is completed and the command is notified to the media-independent handover layer of the respective communication protocol stack, and the media-independent handover layer of the communication protocol stack is further notified to the upper layer of the communication protocol stack that needs the message;

After the multi-mode access device completes the establishment process of the second communication link, it will uplink access the communication link, switch from the first communication link to the newly established second communication link, and remove the original second communication link. a communication link. So far, the handover process from the current first communication link to the target communication link is completed.

Step S103, the multi-mode access device exchanges data packets with the target access network through the target communication link based on the second protocol, and performs the communication between the mobile local area network and the target access network according to the exchanged data packets. services between the above-mentioned service networks.

When step S103 is specifically implemented, the network communication address of the terminal device connected to the mobile local area network is generally allocated and managed through the local area gateway device in the mobile local area network; the wireless access function of the multi-mode access device will communicate After the link is established, the multi-mode access device converts the protocol of the data packet from the wide area network, and sends it to the local area gateway device inside the mobile local area network, and the local area gateway device according to the preset strategy, and/or For the QOS of different services on the terminal equipment in the mobile local area network, the data packets are controlled and managed, and the data packets allowed to be sent are distributed to the terminal equipment in the mobile local area network according to the network communication address of the terminal equipment. The data packets sent by the terminal equipment in the mobile local area network to the wide area network according to its network communication address, pass through the local area gateway device, according to the preset strategy, and/or QOS for different services on the terminal equipment in the mobile local area network , perform control and management, and then send the data packets allowed to be sent to the multi-mode access device; the multi-mode access device performs protocol conversion on the received data packets and sends them to the wide area network.

The first embodiment is described in detail below with an example:

Assume that in the mobile local area network, a multi-mode terminal device C supporting P802.21 is used as the wireless access device, which has the ability to support WIFI wireless access and UMTS wireless access, and supports the function of media-independent switching. When the mobile local area network is located in the WIFI In the available service area of the wireless network, the multi-mode terminal device C accesses the WIFI wireless network in the WIFI wireless access mode, and provides other network terminal devices in the mobile local area network with the access function to the WIFI wireless network; when the user moves out of the WIFI The service area of the wireless network, but still in the available service area of the UMTS wireless network, the multi-mode terminal device C automatically and seamlessly switches to the UMTS wireless access function, accesses the UMTS wireless network through the UMTS wireless access function, and continues to provide services for mobile The LAN provides the access function to the UMTS wireless network. The specific implementation process is shown in Figure 3, including:

When the mobile local area network is in the service area of the wireless access network of the WIFI media type, the WIFI communication mode of the multimode terminal device C in the mobile local area network is used as an uplink access mode to connect other network terminal devices in the mobile local area network. Access to the WAN to provide a WIFI communication link.

Due to the influence of factors such as the movement of the location of the mobile local area network and the environment, the uplink access capability of the WIFI communication mode of the multi-mode terminal device C is reduced, so that the uplink access capability cannot meet the communication requirements of the terminal devices in the mobile local area network. need.

The link layer of the communication protocol stack supporting the WIFI network communication function in the multi-mode terminal device C finds that the uplink access capability of the WIFI network communication mode is reduced, which is not enough to meet the communication needs of the devices in the mobile local area network, so it sends a switching request To the media-independent switching layer of the communication protocol stack of the multi-mode terminal device C, the media-independent switching layer of the communication protocol stack further transmits the request to the upper layer of the communication protocol stack, and the upper layer obtains the correlation according to the POA of the first media WIFI network of the current service. The message selects the target POA for handover.

After the upper layer of the communication protocol stack of the multi-mode terminal device C makes a switching decision, the switching request response is fed back to the link layer of the communication protocol stack with the function of supporting WIFI network communication that sends the switching request through the media-independent switching layer of the communication protocol stack. At the same time, the media-independent handover layer of the communication protocol stack sends a handover instruction to the link layer of the communication protocol stack with the function of supporting UMTS network communication and the media-independent handover layer of the communication protocol stack in the current serving POA, and then the communication protocol stack in the current serving POA The media-independent handover layer sends a handover instruction to the link layer of the communication protocol stack supporting WIFI network communication function in the current serving POA and the media-independent handover layer of the communication protocol stack in the target POA, and further the communication protocol stack media in the target POA Regardless of the handover layer, the indication is notified to the link layer of the communication protocol stack with the function of supporting UMTS network communication in the target POA.

Between the communication protocol stack link layer of the multi-mode terminal device C that supports UMTS network communication function and the communication protocol stack link layer of the target POA, the link establishment command of the UMTS network communication protocol is established to Layer 2 communication link of UMTS network.

After the two-layer communication link to the UMTS network is established, the communication protocol stack link layer supporting the UMTS network communication function in the multimode terminal device C and the communication protocol stack link layer of the target POA, through the The establishment completion command of the two-layer communication link of the UMTS network is notified to the media-independent handover layer of the respective communication protocol stack, and the media-independent handover layer of the communication protocol stack further notifies the upper layer of the communication protocol stack that needs the message.

After the multimode terminal device C completes the establishment process of the two-layer communication link of the UMTS network, it will access the communication link uplink, and switch from the WIFI network communication link to the two-layer communication link of the newly established UMTS network, And remove the original WIFI network communication link.

Afterwards, through the newly established Layer 2 communication link of the UMTS network, the multimode terminal device C performs protocol conversion on the data packet from the wide area network, and then sends it to the local area gateway device inside the mobile local area network. The local area gateway device controls and manages the QOS of different services on the terminal device in the mobile local area network according to the preset policy, and then assigns the data packets that are allowed to be sent to the terminal device to be managed according to the The network communication address is distributed to other terminal devices inside the mobile local area network. For the data packets sent by the terminal equipment in the mobile local area network to the wide area network according to the network communication address assigned to it by the local area gateway device, the local area gateway device according to the preset strategy, and/or for the different terminal devices in the mobile local area network The QOS of the service is controlled and managed, and then the data packets that are allowed to be sent are sent to the multi-mode terminal device C; the multi-mode terminal device C performs protocol conversion on the received data packets and sends them to the wide area network .

The second embodiment provided by the present invention is another method for implementing business continuity in a mobile local area network. When the mobile local area network moves within service areas covered by different media types, it uses the first The access device and the second access device with the communication function supporting the second access network realize the continuity of the ongoing services of the devices in the mobile local area network. The process is shown in Figure 4, including:

Step S201, the mobile local area network accesses the first access network based on the first communication link of the first protocol through the first access device capable of supporting wireless access to the first access network, and according to the - Access to the information exchanged by the network, and conduct business with the business network.

When the mobile local area network is in the service area of the first access network, the mobile local area network uses the first communication mode based on the first protocol supported by the first access device with the communication function of the first access network in the mobile local area network as an uplink interface. The access mode provides the first communication link based on the first protocol for other terminal devices in the mobile local area network to access the wide area network; due to the influence of factors such as the location of the mobile local area network and the environment, the first access device of the first access The uplink access capability of a communication mode is reduced, so that the uplink access capability cannot meet the communication requirements of the terminal equipment in the mobile local area network. At this point, the multi-mode access device determines a target communication link based on the second protocol; and switches the current communication link to the target communication link. details as follows:

Step S202, finding that the first communication link cannot meet the communication requirements of the terminal equipment in the mobile local area network, through the first access device in the mobile local area network that supports the wireless access capability of the first access network, to find the target access network and the A target access device supporting the wireless access capability of the target access network; establishing a target communication link based on the second protocol between the target access device and the target access network, and switching the current communication link to the target communication link.

In step S202, the link layer of the communication protocol stack supporting the first access network communication function in the first access device finds that the uplink access capability of the first communication mode is degraded, which is not enough to meet the requirements of the devices in the mobile local area network. communication requirements, it sends a handover request to the media-independent handover layer of the communication protocol stack of the first access device; after receiving the handover request, the media-independent handover layer of the communication protocol stack passes the internal network of the mobile local area network to the mobile Other terminal devices in the local area network send access capability query requests; after receiving the access capability query requests, other terminal devices in the mobile local area network determine their own wireless access capabilities by scanning the wireless communication networks in the surrounding environment. access capability, and feed back its own wireless access capability information to the first access device that sends the access capability query request;

After the media-independent handover layer of the communication protocol stack of the first access device receives the wireless access capability information fed back by other terminal devices in the mobile local area network, it further transmits the wireless access capability information and the handover request to the upper layer of the communication protocol stack of the first access device; the upper layer of the communication protocol stack makes a decision on switching the target device according to the wireless access capability information, that is, selects the second interface that can provide the required wireless access capability The ingress device is used as the target access device for handover, and at the same time, the media-independent handover layer of the communication protocol stack in the first access device performs handover to the link layer of the communication protocol stack in the first access device that sends the handover request toggle response;

The media-independent handover layer of the communication protocol stack of the first access device sends a handover instruction, and transfers the handover instruction to the communication channel of the second access device through the media-independent handover layer of the communication protocol stack of the second access device. protocol stack link layer; simultaneously pass the communication protocol stack media-independent switching layer of the current service POA, transfer the switching instruction to the communication protocol stack link layer of the current service POA; simultaneously pass the target POA's communication protocol stack media-independent Switching layer, forwarding the switching instruction to the link layer of the communication protocol stack of the target POA;

The link layer of the communication protocol stack of the second access device and the link layer of the communication protocol stack of the target POA that have received the handover instruction establish a layer-2 target communication link based on the second protocol through a link establishment command based on the second protocol Road, that is, the second communication link; after the establishment process of the two-layer communication link is completed, the link layer of the communication protocol stack of the second access device and the link layer of the communication protocol stack of the target POA communicate through the two-layer communication The link establishment completion command is notified to the media-independent switching layer of the respective communication protocol stack; the media-independent switching layer of the communication protocol stack of the second access device further notifies the link establishment completion information to the first access device through the internal network The media-independent switching layer of the communication protocol stack of the first access device, and the upper layer of the communication protocol stack is notified by the media-independent switching layer of the communication protocol stack of the first access device; the target POA further sends the link establishment completion information through the media-independent switching layer of the communication protocol stack Notification to the originating service POA;

After the establishment process of the layer-2 communication link based on the second protocol is completed, the first access device transfers the uplink access function from the first access device to the second access device. The second access device provides the access function of the mobile local area network to the wide area network through the newly established second communication link based on the second protocol, and at the same time, the first access device originally provided the mobile local area network to the wide area network, using The link teardown command in the first protocol is to tear down the original first communication link of the first access network.

Step S203, the second access device exchanges data packets with the second access network through the second communication link based on the second protocol, and performs mobile local area network communication according to the exchanged data packets. business with the business network.

In the second embodiment above, after the first data link is established through the wireless access function of the first access device, the first access device converts the protocol of the data packet from the wide area network, and then sends it to The local area gateway device inside the mobile local area network, the local area gateway device according to the preset strategy, and/or the QOS for different services on the terminal device in the mobile local area network, for the information sent from the wide area network to the terminal device inside the mobile local area network The data is controlled and managed, and then according to the network communication address assigned and managed by the terminal equipment connected to the mobile local area network, the data packets that are allowed to be sent are distributed to the terminal equipment inside the mobile local area network. In addition, the local area gateway device of the mobile local area network will also allocate and manage the network communications of the terminal devices in the mobile local area network according to the local area gateway device according to the preset strategy and/or the QOS of different services on the terminal devices in the mobile local area network. The data sent to the WAN is controlled and managed, and the data packets allowed to be sent are transmitted to the first access device, and the received data packets are converted to the protocol by the first access device, and then sent to the WAN.

Through the wireless access function of the second access device, after the establishment of the second communication link between the mobile local area network and the second access network is completed, the gateway function of the mobile local area network can continue to be replaced by the local area gateway that originally supported the gateway function. Device provision, if the new second access device that provides the access function for the mobile local area network itself supports the function based on the gateway device, then the gateway function of the mobile local area network can also be converted to be provided by the new second access device. Assuming that the original local area gateway device still provides the gateway function, at this time, the second access device, after performing protocol conversion on the data packet from the wide area network, sends it to the local area gateway device inside the mobile local area network, and the same said local area network On the one hand, the gateway device is responsible for allocating and managing the network communication addresses of the terminal devices connected to the mobile local area network. On the other hand, the local area gateway device of the mobile local area network will also respond to the data packets sent to the wide area network by the internal equipment of the mobile local area network according to the network communication address according to the preset strategy and/or the QOS of different services on the equipment in the mobile local area network. After management, the data packets allowed to be sent are transmitted to the second access device, and the received data packets are converted to the protocol by the second access device, and then sent to the wide area network. And, the local area gateway device controls and manages the data sent from the wide area network to the terminal device in the mobile local area network according to the preset strategy and/or the QOS of different services on the terminal device in the mobile local area network, and then according to It allocates and manages network communication addresses for terminal equipment connected to the mobile local area network, and distributes the data packets that are allowed to be sent to the terminal equipment inside the mobile local area network.

The following example describes the second embodiment in detail:

Assume that in the mobile local area network, there are at least two terminal devices A and B, and the connection between the two terminal devices A and B and other terminal devices constitutes a local area network through wired or wireless connection, in which terminal device A has the ability to support the first The wireless access function of the first access network WIFI, the terminal device B supports the wireless access function of the second access network UMTS, when the mobile local area network is in the available service area of the WIFI network, the mobile local area network uses the terminal device A as the mobile local area network access Wireless access devices connected to the WAN. At this time, the gateway function supported by terminal device A can be used as the local area gateway device of the mobile local area network, or other devices with gateway function in the mobile local area network can be used as the local area gateway device of the mobile local area network. When the user moves out of the available service area of the WIFI network but is still in the available service area of the UMTS network, the current uplink access function is seamlessly switched from the terminal device A to the terminal device B through the information interaction between the terminal device A and the terminal device B To the terminal device B, the terminal device B supporting the UMTS wireless communication function is used as the wireless access device of the mobile local area network. At this time, if the terminal device B supports the gateway function, the original gateway function can be switched to the terminal device B at the same time. The specific implementation process is shown in Figure 5, including:

The mobile local area network takes the terminal device A supporting WIFI wireless communication function as the first access device, and further accesses the wide area network based on the protocol supported by the WIFI network, and provides WIFI-based A first communication link of a network communication protocol.

Due to the influence of environmental factors such as the movement of the location of the mobile local area network, the communication capability of the terminal device A supporting the WIFI network communication function in the mobile local area network is reduced, so that the uplink access capability of the terminal device A supporting the WIFI network communication function cannot meet the requirements of mobile communication. Communication requirements for devices in a LAN.

When the link layer of the WIFI communication protocol stack of the terminal device A that supports the WIFI network wireless communication function finds that the communication capability has declined and is not enough to meet the communication needs of the mobile local area network, it sends a switching request to the WIFI communication protocol stack media of the terminal device A Regardless of the handover layer, the media-independent handover layer of the WIFI communication protocol stack, after receiving the request, sends an access capability query request to other terminal devices in the mobile local area network through the internal network of the mobile local area network. After receiving the access capability query request, by scanning the wireless communication network in the surrounding environment, determine the access capability to the WAN through the wireless access network, and feed back the access capability information to send the access capability query The requesting terminal device A;

After the terminal device A that supports the wireless communication function of the WIFI network receives the access capability information fed back by each device in the mobile local area network, the upper layer of the WIFI communication protocol stack makes a decision to switch the target device, and selects the one that can provide the uplink access capability that meets the requirements. Terminal device B serves as the target access device of the handover. After the terminal device A that supports the wireless communication function of the WIFI network makes a decision to switch the target device, it uses the media-independent switching layer of the WIFI communication protocol stack of the terminal device A to transfer to the link layer of the WIFI protocol stack of the terminal device A, and Sending a switching instruction to the media-independent switching function layer of the WIFI communication protocol stack of the terminal device B through the internal network of the mobile local area network; and simultaneously sending the switching instruction to the POA currently attached to the terminal device A that supports the wireless communication function of the WIFI network.

The media-independent switching layer of the WIFI communication protocol stack of the terminal device A that supports the wireless communication function of the WIFI network sends a switching instruction to the UMTS of the terminal device B through the media-independent switching layer of the UMTS communication protocol stack of the terminal device B that supports the wireless communication function of the UMTS network. Communication protocol stack link layer; at the same time through the WIFI communication protocol stack media independent switching layer of POA1 and the UMTS communication protocol stack media independent switching layer in the target POA2, send a switching instruction to the link layer of the WIFI communication protocol stack in POA1 and POA2 The link layer of the UMTS communication protocol stack.

Between the link layer of the UMTS communication protocol stack of the terminal equipment B and the link layer of the UMTS communication protocol stack of the target POA2, a link establishment command based on the UMTS communication protocol is used to establish a second-layer target based on the UMTS communication protocol. The communication link is the second communication link. After the second communication link establishment process is completed, the link layer of the UMTS communication protocol stack of the terminal device B and the link layer of the UMTS communication protocol stack of the target POA2, through the second communication link establishment complete command, Notify to respective media-independent switching layers; the media-independent switching layer of the UMTS communication protocol stack of the terminal device B, and further establish completion information of the second communication link, and notify the WIFI communication protocol stack media-independent of the terminal device A through the internal network switch layer, and notify the upper layer of the WIFI communication protocol stack by the WIFI communication protocol stack media-independent switching layer of the terminal device A; the target POA2, through the UMTS communication protocol media-independent switching layer, further establishes the completion information of the two-layer link Notify to original service POA1.

After the establishment process of the second communication link between terminal device B and POA2 is completed, terminal device A that supports the wireless communication function of the WIFI network transfers the uplink access function to terminal device B that supports the wireless communication function of the UMTS network, and the terminal Device B provides the access function of the mobile local area network to the wide area network through the newly established second communication link based on the UMTS protocol. At the same time, the terminal device A that originally provided the mobile local area network with the ability to access the wide area network uses The link removal command is used to remove the original first communication link based on the WIFI communication protocol. If the terminal device B that provides the access function for the mobile local area network itself supports the gateway function, the gateway function of the mobile local area network can also be transferred to the terminal device B.

Afterwards, through the gateway function supported by the terminal device B, the network communication address of the terminal device connected to the mobile local area network is allocated and managed.

The data packets sent by the terminal device in the mobile local area network according to its network communication address, through the gateway function supported by the terminal device B, according to the preset strategy, and/or the QOS for different services on the terminal device in the mobile local area network, Perform control and management, and perform information interaction with the UMTS network through the terminal device B based on the second communication link, and perform services between the mobile local area network and the media service network according to the interaction information. Similarly, for the data packet sent by the media service network to the mobile local area network, the protocol for carrying the data packet is converted into the UMTS protocol supported by the second communication link through the UMTS network, and transmitted to the terminal based on the second communication link Device B; after receiving the data packet, the terminal device B converts the UMTS protocol carrying the data packet into a protocol supported by the mobile local area network, and according to a preset strategy, and/or Control and manage the QOS of different services on other terminal devices in the mobile local area network, and distribute the data packets allowed to be sent to the terminal devices in the mobile local area network according to the network communication addresses of other terminal devices in the mobile local area network.

The above is described by taking the discovery of a target access device as an example. When the first access device currently providing the access function finds that there are multiple available target access devices in the mobile local area network, according to at least one of the following factors Determine the switching target access device:

The signal strength of the wireless network received by the terminal equipment that can provide the access function in the current mobile local area network, the bandwidth provided by the terminal equipment that provides the access function for the mobile local area network, and the current wireless network serving the terminal equipment that provides the access function QOS, tariff status, and power consumption status of terminal devices providing access functions in the mobile local area network.

The third embodiment provided by the present invention is a mobile local area network, the structure of which is shown in FIG. 6 , including: at least one terminal device. Wherein at least one of the terminal devices has the following capabilities: supporting the first access network access capability and supporting the second access network access capability, for the convenience of description, it is called a multi-mode access device, which further includes: The link layer entity of the first media type of the communication protocol stack, the link layer entity of the second media type of the communication protocol stack, the media independent switching layer entity of the communication protocol stack and the upper layer entity of the communication protocol stack. The mobile local area network may also include a local area gateway device.

The information interaction relationship between each device in the system is as follows:

Under normal circumstances, the multi-mode access device performs data packet interaction with the first access network based on the first protocol through the first communication link with the first access network, and performs Services between the network terminal equipment and the media service network in the mobile local area network. The specific handling is as follows:

The multi-mode access device performs protocol conversion on the data packet sent by the terminal device in the mobile local area network, that is, converts the protocol carrying the data packet into the first protocol supported by the first communication link, and then transmitting the data packet to the first access network; after receiving the data packet, the first access network converts the protocol carrying the data packet into a protocol supported by the service network, and then Transmitting the data packet to the service network. The data packet sent by the service network reaches the multi-mode access device through the first communication link after protocol conversion through the first access network, and the multi-mode access device will carry the first part of the data packet. A protocol is converted into a protocol supported by the mobile local area network, and then the data packet is sent to the mobile local area network.

When the multi-mode access device finds that its communication capability cannot meet the communication requirement, based on the second protocol, establish a second communication link with the second access network. The specific handling is as follows:

When the first media type link layer entity of the communication protocol stack finds that its communication capability cannot meet the communication requirements, it sends a switching request, and transfers it to the upper layer entity of the communication protocol stack through the media-independent switching layer entity of the communication protocol stack;

The upper layer entity of the communication protocol stack is configured to, after receiving the handover request, select the handover target access network as the second access network according to the relevant information of the currently serving first access network, and through the communication The protocol stack media-independent switching layer entity notifies the communication protocol stack of the first media type link layer entity;

The media-independent handover layer entity of the communication protocol stack sends a handover indication to the second access network and the second media type link layer of the communication protocol stack; the second access network receiving the handover indication The media-independent handover layer of the POA device communication protocol stack relays the handover instruction to the link layer of the POA device communication protocol stack of the second access network;

The link layer of the communication protocol stack of the POA device of the second access network that receives the handover instruction, and the second media type link layer of the communication protocol stack of the multi-mode access device, based on the second access network protocol The link establishment command establishes the target communication link, that is, the second communication link.

After the second communication link is established, the multi-mode access device performs data interaction with the second access network based on the second protocol through the second communication link, and performs the moving according to the interaction data. The business between the terminal equipment in the local area network and the service network. The specific handling is as follows:

After the second communication link is established, the multi-mode access device performs protocol conversion on the data packet sent by the terminal device in the mobile local area network, that is, converts the protocol carrying the data packet into the protocol supported by the second communication link the second protocol, and then transmit the data packet to the second access network; after receiving the data packet, the second access network converts the second protocol carrying the data packet into the protocols supported by the service network, and then transmit the data packet to the service network.

In addition, the mobile local area network allocates and manages the network communication addresses of the network terminal devices connected to the mobile local area network through the local area gateway device in the mobile local area network.

The data packets sent by the terminal equipment in the mobile local area network to the service network according to its network communication address, pass through the local area gateway equipment in the mobile local area network, according to the preset strategy, and/or QOS for different services on the terminal equipment in the mobile local area network, Perform control management, determine the data packets allowed to be sent, and transmit the allowed data packets to the multi-mode access device;

After the multi-mode access device performs protocol conversion on the data packet sent by the second access network, before sending it to the terminal device in the mobile local area network, through the local area gateway device in the mobile local area network, according to the preset strategy, and /or for the QOS of different services on the network terminal equipment in the mobile local area network, control and manage the data packets transmitted by the multi-mode access equipment, and then distribute the data packets that are allowed to be sent according to the network communication addresses managed by them to corresponding terminal equipment.

The fourth embodiment provided by the present invention is a mobile local area network, the structure of which is shown in Figure 7, including: a plurality of network terminal devices; at least one of the network terminal devices has access to the first access network Capability, for the convenience of description, it is called the first access device, and at least one has the access capability of accessing the second access network, for the convenience of description, it is called the second access device; the first An access device includes a first media type communication protocol stack link layer entity, a communication protocol stack media-independent switching layer entity and a communication protocol stack upper layer entity; the second access device includes a second media type communication protocol stack link layer entity Entity, communication protocol stack media-independent switching layer entity and communication protocol stack upper layer entity. The mobile communication system may also include a local area gateway device.

The information interaction relationship between the devices is as follows:

Under normal circumstances, the first access device, through the first communication link with the first access network, performs data packet interaction with the first access network based on the first protocol, and according to the exchanged data packet Carry out the business between the terminal equipment and the service network; the specific processing conditions are as follows:

The first access device performs protocol conversion on the data packet sent by the terminal device in the mobile local area network, that is, converts the protocol carrying the data packet into the first protocol supported by the first communication link, and then converts the data packet to the first protocol supported by the first communication link. transmit the packet to the first access network; after receiving the data packet, the first access network converts the protocol carrying the data packet into a protocol supported by the service network, and then converts the data Packets are transmitted to the service network. After the data packet sent by the service network undergoes protocol conversion through the first access network and reaches the first access device through the first communication link, the first access device converts the protocol carrying the data packet into protocol supported by the mobile local area network, and then send the data packet to the mobile local area network.

When the first access device finds that its communication capabilities cannot meet the communication requirements, determine the second access network as the target access network, and find a second access network capable of accessing the second access network device; sending a handover instruction to the second access network and the second access device; the second access device, according to the access instruction of the first access device, establishes its The second communication link with the second access network; the specific processing is as follows:

When the link layer entity of the first media type communication protocol stack of the first access device finds that its own communication capability cannot meet the communication requirements, it sends a switching request, and passes the media-independent communication protocol stack of the first access device. The switching layer entity transfers to the upper layer entity of the communication protocol stack of the first access device;

The upper layer entity of the communication protocol stack of the first network access device is configured to, after receiving the handover request, select the handover target network as the second access network according to the relevant information of the currently serving first access network, And notify the link layer entity of the first media type communication protocol stack of the first access device through the media independent handover layer entity of the communication protocol stack of the first access device;

The link layer entity of the communication protocol stack of the first media type performs a capability query through the media-independent switching layer entity of the communication protocol stack of the first access device, and learns that it can access the second media type according to the obtained capability query result. a second access device that accesses the network;

sending a handover instruction to the second access device and the second access network through the media-independent handover layer of the communication protocol stack of the first access device;

The media-independent handover layer entity of the communication protocol stack of the second access device relays the handover instruction of the first access device to the link layer entity of the second media type communication protocol stack of the second access device;

The link layer entity of the second media type communication protocol stack of the second access device establishes a target communication link between the mobile local area network and the second access network based on the link establishment command of the second protocol according to the handover instruction Road, that is, the second communication link.

After the second communication link is established, the second access device exchanges data packets with the second access network based on the second protocol through the second communication link, and according to the exchanged The data packets carry out services between the terminal equipment and the media service network. The specific handling is as follows:

The second access device performs protocol conversion on data packets sent by other terminal devices in the mobile local area network, that is, converts the protocol carrying the data packets into a second protocol supported by the second communication link, and then converts the transmitting the data packet to the second access network; after receiving the data packet, the second access network converts the protocol carrying the data packet into a protocol supported by the service network, and then converts the The data packets are transmitted to the service network.

In addition, the mobile local area network allocates and manages the network communication addresses of the terminal devices connected to the mobile local area network through the local area gateway device in the mobile local area network.

The data packets sent by the terminal equipment in the mobile local area network to the service network according to its network communication address, pass through the local area gateway equipment in the mobile local area network, according to the preset strategy, and/or QOS for different services on the terminal equipment in the mobile local area network, Perform control and management, and transmit the allowed data packets to the second access device;

After the second access device performs protocol conversion on the data packet sent by the second access network, before sending it to the terminal device in the mobile local area network, through the local area gateway device in the mobile local area network, according to the preset policy, and/or Or control and manage the QOS of different services on the devices in the mobile LAN, determine the data packets that are allowed to be sent, and then distribute the data packets that are allowed to be sent to the corresponding terminal devices according to the network communication addresses of the terminal devices managed in it.

It can be seen from the specific implementation solutions provided by the above embodiments of the present invention that the mobile local area network can provide support for service continuity in wireless networks of different media types, and realize seamless switching.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (11)

1. A method for realizing service continuity of a mobile local area network is characterized by comprising the following steps:

the mobile local area network carries out service with a service network according to a first communication link based on a first protocol at present;

when the mobile local area network finds that the communication capability of the mobile local area network can not meet the communication requirement, a target access network is searched through multimode access equipment which supports the wireless access capability of a first access network and a second access network in the mobile local area network;

the method comprises the steps that multimode access equipment which supports wireless access capabilities of a first access network and a second access network in a mobile local area network selects a target access network to be switched as the second access network according to relevant information obtained by the first access network serving the multimode access equipment at present;

sending a switching indication to the second access network and a second media type link layer of the communication protocol stack of the multimode access device through a media independent switching layer of the communication protocol stack of the multimode access device; the media irrelevant switching layer of the communication protocol stack of the second access network access point POA equipment which receives the switching indication transfers the switching indication to a link layer of the communication protocol stack of the second access network access point POA equipment;

and the link layer of the POA equipment communication protocol stack of the second access network access point receiving the switching indication and the link layer of the second media type of the communication protocol stack of the multimode access equipment establish a target communication link between the mobile local area network and the second access network based on a link establishment command of a second access network protocol.

2. The method of claim 1, wherein the process of the mobile lan performing the service with the service network according to the first communication link currently based on the first protocol specifically includes:

the mobile local area network accesses to a current first access network through a multimode access device which has the wireless access capability of supporting the first access network and a first communication link based on a first protocol, and performs service with a service network according to information interacted with the first access network;

or,

the mobile local area network accesses to the current first access network through a first access device which has the wireless access capability of supporting the first access network and a first communication link based on a first protocol, and performs service with a service network according to information interacted with the first access network.

3. The method according to claim 1 or 2, wherein when the first access device currently providing the access function finds a plurality of available target access devices in the mobile lan, the target access device for handover is determined according to at least one of the following factors:

the signal intensity of the wireless network received by the terminal equipment which can provide the access function in the current mobile local area network, the bandwidth provided by the terminal equipment which provides the access function for the mobile local area network, the current quality of service (QOS) and the expense condition of the wireless network which serves the terminal equipment which provides the access function, and the consumption condition of the terminal equipment which provides the access function in the mobile local area network to the electric quantity.

4. The method of claim 1, wherein when the mobile lan finds that its communication capability cannot meet the communication requirement, the method further comprises:

searching a target access network and target access equipment which has the wireless access capability supporting the target access network through first access equipment which has the wireless access capability supporting the first access network in a mobile local area network;

a first access device which has the wireless access capability of supporting a first access network in a mobile local area network selects a switched target network as a second access network according to related information obtained by the first access network which currently serves the multimode access device; and finding out second access equipment which supports the wireless access capability of a second access network in the mobile local area network through access capability inquiry;

the first access equipment sends a switching instruction through a media independent switching layer of a communication protocol stack of the first access equipment, and transfers the switching instruction to a link layer of the communication protocol stack of the second access equipment through the media independent switching layer of the communication protocol stack of the second access equipment; transferring the switching indication to a link layer of a communication protocol stack of the POA equipment of the second access network access point through a media independent switching layer of the communication protocol stack of the POA equipment of the second access network access point;

and the link layer of the second access equipment communication protocol stack and the link layer of the second access network access Point (POA) equipment communication protocol stack which receive the switching indication establish a target communication link between the mobile local area network and the second access network based on a link establishment command of a second protocol.

5. The method of claim 1 or 4, wherein the first communication link between the mobile local area network and the first access network is closed after the target communication link between the mobile local area network and the second access network is established.

6. The method of claim 4, further comprising:

and the mobile local area network carries out data packet interaction with the second access network through the target communication link based on the second protocol, and carries out service between the mobile local area network and the service network according to the interacted data packet.

7. The method according to claim 6, wherein the performing of the service with the media service network via the target communication link based on the second protocol specifically includes:

allocating and managing network communication addresses of network equipment accessed to the interior of the mobile local area network; and the number of the first and second groups,

controlling and managing the network equipment in the mobile local area network according to the data packet sent by the network communication address, and determining the data packet allowed to be sent; converting the protocol carrying the data packet allowed to be sent into a protocol used by a target communication link, and transmitting the protocol to the corresponding second access network through the target communication link; the access network converts the protocol for bearing the data packet allowed to be sent into a protocol supported by a service network and transmits the protocol to the service network; and the number of the first and second groups,

a data packet sent by a service network converts a protocol for bearing the data packet into a protocol used by the target communication link through the second access network, and transmits the protocol to the mobile local area network through the communication link; the mobile local area network converts the protocol used by the received data packet into a protocol supported by the mobile local area network, controls and manages the data packet, and distributes the data packet after control and management according to the network communication address of the network equipment in the mobile local area network.

8. A mobile local area network comprises at least one terminal device, and is characterized in that at least one multimode access device with a multimode access function in the terminal device establishes a second communication link with a second access network based on a second protocol when the multimode access device finds that the communication capability of the multimode access device can not meet the communication requirement; the multimode access device further comprises: a first media type link layer entity of a communication protocol stack, a second media type link layer entity of the communication protocol stack, a media independent switching layer entity of the communication protocol stack and an upper layer entity of the communication protocol stack;

when the first media type link layer entity of the communication protocol stack finds that the communication capability of the first media type link layer entity of the communication protocol stack can not meet the communication requirement, a switching request is sent and transferred to an upper layer entity of the communication protocol stack through a media independent switching layer entity of the communication protocol stack;

the upper entity of the communication protocol stack is used for selecting a switched target access network as a second access network according to the related information of the currently served first access network after receiving the switching request, and informing the first media type link layer entity of the communication protocol stack through the media-independent switching layer entity of the communication protocol stack;

the communication protocol stack media independent switching layer entity sends a switching indication to the second access network and the communication protocol stack second media type link layer; the media irrelevant switching layer of the communication protocol stack of the second access network access point POA equipment which receives the switching indication transfers the switching indication to a link layer of the communication protocol stack of the second access network access point POA equipment;

the link layer of the communication protocol stack of the second access network access point POA equipment which receives the switching indication and the link layer of the second media type of the communication protocol stack of the multimode access equipment establish a target communication link, namely a second communication link, based on a link establishment command of a second access network protocol;

and after the second communication link is established, the multimode access equipment performs data interaction with a second access network based on a second protocol through the second communication link, and performs service between the terminal equipment in the mobile local area network and a service network according to the interaction data.

9. The mobile local area network of claim 8, further comprising:

the local area gateway equipment is used for allocating and managing the communication address of the terminal equipment accessed into the mobile local area network; and controlling and managing the data packet sent by the terminal equipment according to the communication address, determining the data packet allowed to be sent, and transmitting the data packet allowed to be sent to the terminal equipment with the multimode access function; and controlling and managing the data packet transmitted by the terminal equipment with the multimode access function, and distributing and processing the data packet according to the network communication address of the terminal equipment in the mobile local area network.

10. A mobile local area network comprising a plurality of terminal devices, wherein at least one of said terminal devices has a first access device supporting an access capability of a first access network and at least one second access device supporting an access capability of a second access network, said first access device comprising a first media type communication protocol stack link layer entity, a communication protocol stack media independent handover layer entity and a communication protocol stack upper layer entity; the second access device comprises a second media type communication protocol stack link layer entity, a communication protocol stack media independent switching layer entity and a communication protocol stack upper layer entity;

a first media type communication protocol stack link layer entity, configured to send a handover request when finding that the communication capability of the first media type communication protocol stack link layer entity cannot meet the communication requirement, and transfer the handover request to a communication protocol stack upper layer entity of the first access device through a communication protocol stack media independent handover layer entity of the first access device;

the upper entity of the communication protocol stack is used for selecting a target network to be switched as a second access network according to the related information of the currently-served first access network after receiving the switching request, and informing the first media type communication protocol stack link layer entity of the first access equipment through the entity of the communication protocol stack media-independent switching layer of the first access equipment;

the first media type communication protocol stack link layer entity queries the capacity through the communication protocol stack media-independent switching layer entity of the first access device, and acquires a second access device which can be accessed to a second access network according to the obtained capacity query result;

sending a switching instruction to the second access equipment and a second access network through a communication protocol stack media independent switching layer of the first access equipment;

a communication protocol stack media-independent switching layer entity of the second access device relays a switching instruction of the first access device to a second media type communication protocol stack link layer entity of the second access device;

and the second media type communication protocol stack link layer entity of the second access equipment establishes a target communication link, namely a second communication link, between the mobile local area network and the second access network according to the switching indication and based on a link establishment command of a second protocol.

11. The mobile local area network of claim 10, further comprising:

the local area gateway equipment is used for distributing and managing the network communication address of the terminal equipment in the mobile local area network; and controlling and managing the data packet sent by the terminal equipment according to the network communication address, determining the data packet allowed to be sent, and transmitting the data packet allowed to be sent to the terminal equipment with access capability; and controlling and managing the data packet transmitted by the terminal equipment with access capability, determining the data packet allowed to be transmitted, and distributing the data packet allowed to be transmitted according to the network communication address of the terminal equipment.

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