CN100521660C - Method for implementing integrated network mobile switch management - Google Patents

Abstract

The present invention relates to a method for implementing integrated network mobile handover management. The system structure of integrated network and pervasive service is a brand-new network structure constructed to overcome the deficiencies of existing network technologies. The network uses To realize service integration and network integration. The purpose of the present invention is achieved in this way: a method for implementing integrated network mobile handover management, including the Internet, mobile communication network, communication node, access switch router, authentication center, mapping server, the steps are: detect and replace the mapped steps; steps to inform; steps to avoid routing black holes. The invention fully realizes the unity of the communication interface of the user terminal in the switching process. By changing the network topology and replacing the route identification, etc., the problems of time delay and packet loss rate during the mobile switching process of the communication terminal are effectively solved.

Description

A method for implementing integrated network mobile handover management

technical field

The invention relates to a realization method of integrated network mobile handover management, which is an electric digital communication processing method using the network.

Background technique

In the traditional TCP/IP network environment, IP provides the routing function for the Internet. It assigns logical addresses, namely IP addresses, to all nodes (including hosts and routers), and each port of each host has an IP address. address. An IP address includes a network prefix and a host part, and all hosts on the same link usually have a network prefix and different host parts. This enables IP to perform route selection based on the network prefix part of the IP address of the destination node, so that the router only needs to save a simple network prefix route instead of saving a separate route for each host. In this case, due to network prefix routing, when a node switches from one link to another without changing its IP address, it is impossible for the node to receive data packets on the new link, thus It is also impossible to communicate with other nodes.

Aiming at the mobility problem of Internet communication, the existing technology provides a set of mobile IP (Mobile IP) technology to support mobility on the basis of the original network. Mobile IP introduces two sets of addresses and the mechanism of proxy routers. The mobile terminal is assigned a home address in the home network. When moving to a foreign network, a care-of address is re-assigned through the foreign agent router of the foreign network. With the help of the home agent router and the foreign agent router, all communication with the mobile terminal is through The home address and the care-of address are translated to realize pathfinding transmission. Under the mobile IP solution, all terminals can continue to use the original home address to communicate after moving.

The design basis of Mobile IP is based on the existing network architecture, basically without any modification to the existing network architecture. This makes mobile IP have many insurmountable problems. The first is the problem of triangular routing. In Mobile IPv4, this problem is particularly serious. Because the architecture of Mobile IP determines that all communication needs the help of the home agent to obtain the relationship between the care-of address and the home address, and even requires the home agent to directly establish a tunnel to route the data packet to the foreign network. This greatly reduces the efficiency of routing. In the worst case, a 2X problem may occur: all mobile terminals in the same network need to go to the home agent to establish a local tunnel for communication. This problem is partially solved in Mobile IPv6, but at the cost of changing the address of the communication peer on the mobile terminal in the protocol stack, that is to say, the mobile terminal must know the address change of the peer and enable the care-of address to directly communicate with the peer . This raises the requirement on the mobile terminal, and also violates the requirement that the address of the mobile terminal remains unchanged to a certain extent. Secondly, the requirement of mobile IP design idea determines that the switching speed under the support of mobile IP is very low and the interruption time is long. This is likely to cause interruption of communication. Mobile IP was not designed for high-speed movement from the beginning, it is suitable for long-term movement. Finally, the mobility support of Mobile IP is not suitable for the requirements of an integrated network supporting pervasive services. An integrated network supporting pervasive services requires uniform access to all users and the same communication connection mode for all services. User terminals should be unaware of changes in mobility and should be able to communicate in the same manner wherever they can be accessed. This requires network intelligence to provide more support for users' mobility.

In mobile communication systems (such as 2G, 3G), the support for mobility is quite complete. End users always use the same way to access and communicate, and the network embodies more intelligence. However, the mobile communication system is essentially a network that supports voice services, and inherently lacks support for data services. Many ways and methods of the mobile communication system are worthy of reference in the new network design scheme, but adaptive improvements should be made according to the characteristics of the new network.

Contents of the invention

The present invention proposes a method for implementing integrated network mobile handover management, which is a method for realizing mobile handover management in the system structure of integrated network and pervasive service. The system of integrated network and pervasive service The structure is a brand-new network structure constructed to overcome the deficiencies of existing network technologies, and the network is used to realize service integration and network integration. The present invention, on the basis of in-depth and systematic analysis and research on the implementation schemes of handover management supported by different mobility of the existing telecommunication network and the Internet, draws lessons from the implementation method of handover management in the mobile communication system, and realizes that it supports universal A method for implementing mobility-supported handover management in an integrated service network minimizes handover delay and packet loss rate.

The purpose of the present invention is achieved like this:

A method for implementing integrated network mobile handover management, which is applied to a network system composed of a mobile terminal, an access switch router, an authentication center, and a mapping server, wherein the access switch router is responsible for terminal access and identification mapping relationship Assigning, the mapping server maintains the mapping relationship between the access ID and the exchange routing ID in the network and provides query services to the access router and other mapping servers, and the authentication center is responsible for access control and authentication of the user. The method includes the following steps:

Step 1, the step of detecting and replacing the mapping, the access switching router periodically broadcasts the router announcement to the access network managed by itself, the mobile terminal monitors and receives the announcement message, and detects whether it moves according to the content in the announcement message;

Or another method is adopted for the mobility detection of the mobile terminal, and the mobile terminal monitors the status events of the underlying communication link to discover its own movement;

After the mobile terminal discovers that it has moved, it applies to the new access switch router for re-access. The new access switch router authenticates the terminal through the authentication center, assigns a new identity mapping relationship, and then notifies the mapping server to update the user terminal. The identity mapping relationship of ;

Step 2: After the mapping server updates the identification mapping relationship of the mobile terminal, enter the step of notification, including the mapping server notifying the access switching router that the user terminal accessed last time of the routing identification newly assigned by the user terminal, and the access switching router will The new mapping relationship of the mobile terminal notifies all the access switch routers where the communication peers of the mobile terminal are located;

Step 3. To avoid routing black holes caused by the terminal shutting down or leaving the network without knowing it, the access switch router judges whether the terminal has left according to the update notifications sent regularly by all terminals. If it leaves, delete the identification mapping relationship and notify the mapping The server deletes this terminal information in a timely manner to avoid routing black holes.

A method for implementing integrated network mobile handover management, comprising the Internet, a mobile communication network, a communication node, an access switch router, an authentication center, and a mapping server, the steps of which are:

The step of detecting and replacing the mapping is to detect the mobility of the mobile terminal and update the terminal identification mapping relationship stored on the mapping server;

A step of notifying, notifying other relevant components in the network of the movement of the mobile terminal;

Steps to avoid routing black holes.

The beneficial effects produced by the invention are: the invention realizes the handover management of mobility support under the integrated network system supporting universal services. The invention fully realizes the unity of the communication interface of the user terminal in the switching process. Except for the network management program on the user terminal, all other upper-layer communications do not need to perceive the movement of the local machine and the communication peer. The invention effectively solves the problems of time delay and packet loss rate in the mobile switching process of the communication terminal by using methods such as changing the network topology and replacing the routing identifier.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Figure 1 is a schematic diagram of the integrated network and pervasive service architecture;

Figure 2 is a schematic diagram of an integrated network topology;

FIG. 3 is a schematic diagram of movement of a user terminal in Embodiment 1;

FIG. 4 is a schematic diagram of a message flow during the handover process in Embodiment 2;

FIG. 5 is a schematic diagram of triangular routing of communication peer data packets when the user terminal is moving in Embodiment 6. FIG.

Detailed ways

Embodiment one:

In order to overcome the deficiencies of existing technologies, an architecture for realizing integrated network and pervasive services is proposed, which is used to realize service integration and network integration. An architecture that realizes integrated network pervasive services allows various mobility access including fixed users and mobile terminals, mobile subnets, and ad hoc network users. Fixed users and mobile users enjoy the same personalized business services, realizing Distributed network resource sharing and search services, transmission of voice, data, image and other services and provide fine-grained quality of service to ensure consistent and universal services to users.

The new architecture model of integrated network and pervasive service is shown in Figure 1, which includes two major parts: "networking layer" and "service layer".

"Netcom layer" includes virtual access sub-layer and virtual backbone sub-layer, providing an integrated network communication platform for data, voice and other services. Various services are transmitted in a unified "specific" grouping mode in the "Netcom layer". The "Netcom layer" adopts the "indirect communication" mode: the virtual access sublayer uses the access identifier to forward data, while the virtual backbone sublayer uses the internal switch routing identifier instead of the access identifier to forward, and after reaching the access switch router at the communication peer , the switch routing identifier of the data packet is replaced back to the original access identifier; the virtual access sublayer is responsible for the access of communication terminals, and the virtual backbone sublayer solves location management and switch routing theory, user privacy, network security, Controllability, manageability and mobility are well realized at the "netcom layer".

The "service layer" is responsible for the conversation, control and management of various services, including various network services provided by operators or third-party value-added service providers, mainly voice, data, streaming media, etc. Different services use the same "Service Layer" hosting. Various services, network resources, and users are identified by unique identifiers, and each application must be bound to the service identifier, and the analysis is performed from the service identifier to the connection identifier, and from the connection identifier to the exchange routing identifier , so as to establish the parsing and mapping theory of service identification and connection identification for ubiquitous services. Operators or third-party value-added service providers will provide users with guaranteed personalized services through the integrated network personalized service model. The service layer also includes a variety of service functional components, including service components such as media conversion, media distribution, billing and location services, virtual home environment, and management components such as session management, resource management, mobility management, and service quality management.

The integrated network and pervasive service system is a new network architecture different from the OSI seven-layer network system and the Internet four-layer network system. The integrated network and pervasive service system organically unifies users, services, and network resources as a whole, and realizes network integration and provides pervasive services for users.

The virtual backbone module is further divided into a switching routing layer and a management layer. The switching and routing layer includes switching and routing devices such as access routers and generalized switching routers; the management layer includes management components such as mapping servers and authentication centers. The following are the introductions:

1. Access Switch Router (Access Switch Router, ASR)

The access router is responsible for the access of various fixed terminals, mobile terminals, fixed networks such as WLAN, mobile subnets, and mobile networks such as ad hoc networks, and assigns access identifiers (Accessing Identifier, AID) and exchange routing identifiers to access users (switching-Routing identifier, RID), and replace the user's data packet with the identification and then transmit it in the core network.

2. General Switch Router (GSR)

The main function of the generalized switching router is to select routes and forward data packets according to the switching routing identifier in the data packets.

3. Mapping server (Identifier Mapping server, IMS)

The mapping server is mainly responsible for maintaining the mapping relationship between the access identifier and the switching routing identifier in the network, and providing query services to the access router and other mapping servers. All the mapping relationships stored on the mapping server have been authenticated and can be used by legal terminals.

4. Certification center

The authentication center is responsible for recording the user category, the service level enjoyed by the user, etc., and performs access control and authorization when the user accesses. The authentication information of all legitimate users is stored in the database of the authentication center. During the authentication process, not only the network needs to verify whether the terminal is legal, but the terminal also needs to verify whether the network is legal.

The core idea of the network layer of the integrated network system is to divide the network into the access layer and the core layer, and assign a unique end system identifier to each user in the network, and the access identifier remains the same during the moving process. There are two types of identification in the network: access identification and routing identification, where the access identification can only be used at the access layer, and the routing identification can only be used at the core layer; the protocol control messages of the entire network can be divided into two types : the access layer protocol control message and the core layer protocol control message, wherein the access layer protocol control message is transmitted using the access identifier, and the core layer protocol control message is transmitted using the routing identifier.

The invention provides a method for realizing mobility-supported handover management under an integrated network supporting universal services, which is a refined scheme of the theory of integrated networks and universal services.

Under the framework of an integrated network supporting pervasive services, the most important solution is to layer the network topology. The scheme divides the original unified network into an access part and a backbone part topologically. The access part network is located at the edge of the backbone part and is responsible for the access of all user terminals. On this access network, all terminals are addressed using the access identifier. The backbone part of the network is responsible for the routing of terminals in different access networks. The demarcation point between the two parts of the network is the access switch router. The access switch router has both the interface of the access network and the interface of the backbone network. Other than that, no overlap between the two parts of the network is allowed. In this way, a unified communication interface is provided for the user terminal: for any other terminal, the user program only needs to use the access identifier of the other terminal to communicate. All communication of the user terminal is forwarded through the access switching router of the access network where it is located. For the communication peers located in the same access network, they can be directly forwarded to the other party. However, for the communication peers located in other access networks, the access switching router must replace the access identifier on the data packet with the corresponding routing identifier and forward it to the backbone network. When the data packet is forwarded on the backbone network to the access network access switch router where the communication peer is located, the reverse replacement is performed, and the routing identifier in the data packet is replaced with the corresponding access identifier according to the mapping relationship, and forwarded to communication peer. The access switching router must use the mapping server in the network to resolve the identity mapping relationship. The identity mapping relationships assigned by all connected user terminals in the network must be stored in the mapping server. The topology diagram of the integrated network is shown in Fig. 2 .

In this solution, to realize support for mobility, the most critical issues are:

1. The access of the user terminal after moving must establish a new identification mapping relationship in time;

2. All the access switching routers of the access network where the communication counterparts that are communicating with the mobile user terminal and wishing to communicate with the mobile user terminal must be informed of the new identity mapping relationship of the mobile user terminal in a timely manner;

If the access switch router where the communication peer is located does not have an identity mapping relationship with the mobile user terminal when the movement occurs, then the identity replacement and forwarding it provides for the communication peer is equivalent to a new identity mapping resolution process. This process only needs to ensure that the identification mapping relationship of the mobile user terminal stored in the mapping server in the network is up-to-date. After the access of the user terminal is reported to the mapping server by the access switching router, it mainly depends on the function of the mapping server. This will be discussed in another patent on a location management implementation for an all-in-one network. Handover management discussed in this patent will be the basis for it.

This embodiment mainly considers the interaction and processing between the user terminal and the access router during the moving process of the user terminal, so as to ensure the above-mentioned problem 1 and the communication process involved in problem 2. The access routers where the communication peers are located ensure that they can update the stored identity mapping relationship of the mobile user terminal in time. Another important purpose of handover management is to minimize the packet loss rate during handover and the communication interruption time caused by handover. The situation where the user terminal moves is shown in FIG. 3 .

To realize mobility-supported handover management under an integrated network that supports pervasive services, the following three steps are required:

Steps to detect and replace mappings.

This step is mainly accomplished by message interaction between the user terminal and the access switch router. The access switching router needs to periodically send router advertisements, and user terminals rely on this router advertisement or the link state event notification of the low-level communication link to discover their own mobility.

After the user terminal finds that it has moved, it needs to apply to the access router for re-access. The access router assists in completing authentication and assignment of new terminal identification mapping assignments. Then the access router is also responsible for notifying the mapping server to update the mapping relationship of the user terminal. In order to shorten the switching time accordingly, the user terminal can broadcast a router advertisement request after the communication link is re-established, and then the access switch router replies with a router advertisement message containing the access switch router entry identifier, and the user terminal then modifies the gateway and initiate an access request.

The step of notifying relevant other components in the network of the movement of the mobile terminal.

In this step, mainly through the cooperative work between the access switch router and the mapping server, the following main tasks are completed: the access switch router of the original access network of the communication peer end processes the user terminal moving out of the local area, including establishing Handing over the identifier; notifying the access switch routers of the access networks where the communication counterparts of the moving user terminal are located, and updating the mapping relationship of the identifier of the moving user terminal.

Avoid routing black holes.

The final problem to be solved is to avoid routing black holes. The routing black holes are that the user terminal leaves the network and does not reconnect. In this case, it is necessary to detect the departure of the user terminal to avoid forming a routing black hole.

Embodiment two:

This embodiment is a preferred solution of Embodiment 1, and is a refinement of the steps of mobility detection of the mobile terminal in Embodiment 1. The steps include:

The access switch router periodically broadcasts a router advertisement to the access network it manages, and the notification message at least includes information such as the network interface identifier of the access network side of the access switch router, the identity identifier of the access switch router itself, and the like.

The mobile terminal monitors and compares the identity of the access switching router received in the notification message with the original saved identity. If the two are found to be different, it means that a move has occurred, and the identity of the new access switching router will be saved. Modify the gateway of the terminal to the new access switch router network interface ID; if the same, it means that there is no movement; if there is no old access switch router ID, it means that the access host has just started up.

After the mobile terminal finds that it has moved, it re-requests access to the new gateway.

The access router performs identity authentication on the terminal.

The access router reassigns the routing identifier to the mobile terminal that has passed the identity authentication, forms a new identifier mapping relationship with the access identifier of the mobile terminal, and stores it in the local mapping table.

The access router notifies the mapping server of the new identification mapping relationship of the mobile terminal, allowing the terminal to communicate normally.

This embodiment can also be described as, the message flow of its switching process is as shown in Figure 4:

In sub-step 1, each access switch router periodically broadcasts a router advertisement to the access network it manages. The notification includes at least the following information: the identifier of the network interface on the access network side of the access switch router, and the identity identifier of the access switch router itself.

In sub-step 2, the user terminal monitors the router advertisement broadcast by the access switch router at all times, and saves the identity of the access switch router therein. If the ID of an old access switch router already exists, go to sub-step 3; if there is no ID of the old access switch router, it means that the access host has just been powered on, and repeats sub-step 2.

Sub-step 3, if the identity of the access switch router just received is different from the old one, it means that the user terminal has moved, and the gateway of the terminal is modified to the network interface identifier of the access switch router in the router advertisement just received, And send an access request to the access switch router, and transfer to the access switch router to perform the following sub-step 4, and the user terminal itself enters the identity authentication process. If the identity authentication passes, the user terminal turns to the normal communication process. If the user terminal has not passed the identity authentication, check its own identity information, adopt a certain strategy and repeat substep 2.

In sub-step 4, the access switch router authenticates the identity of the user terminal that initiates the access request. If not passed, send an error message to the user terminal; if passed, take an unused routing identifier from the locally managed routing identifier and the access identifier of the user terminal to form a mapping relationship, and store it in its own local mapping table , and notify the mapping server of this new mapping relationship.

Embodiment three:

This embodiment is a preferred solution of the first embodiment, which is a refinement of the steps of the mobility detection of the mobile terminal in the first embodiment, and an improvement on the second embodiment, which can speed up the process of the mobility detection. The substeps include:

The sub-step 1 of this embodiment is the same as the sub-step 1 in the second embodiment.

In sub-step 2, the user terminal can discover the state change of the lower layer communication link. When the communication link is re-established, a router advertisement request is broadcast immediately, and the access switching router immediately sends a router advertisement to the user terminal after receiving the request. The user terminal changes the gateway to the network interface identifier of the access switching router in the router advertisement, initiates an access request, and enters the identity authentication process. If the identity authentication is passed, enter the normal communication process; if not, adopt a certain strategy to repeat this step. The specific content of the policy here depends on the specific implementation. The simplest is periodic repetition. However, there may be the following constraints: a. The power management of the terminal. If the terminal is a battery-powered device, it may be necessary to consider whether intensive repetition of step 2 meets the power consumption requirements; b. The user's access interruption time Requirement, if the user wants the shortest interruption time of access, then it is required to repeat step 2 at a very short interval; c. Consider the bearing capacity of the network, especially whether the router advertisement broadcast by the user terminal in step 2 will cause network burden. There may be other considerations that will affect the cycle at which step 2 is repeated. In addition, it is also possible to consider: if the verification step fails, is there an attacker pretending to access the switch router to defraud the end user's information? So there is also the safety factor to consider here. Here, the policy requirement for repeating step 2 is, if a certain step in the middle fails, from which step the user terminal should start to repeat. In the actual implementation process, the above and other possible factors should be considered comprehensively to formulate specific strategies.

This embodiment can be described as:

The mobile terminal monitors the status of its own underlying communication link.

When the link is found to be re-established, it actively sends a router advertisement request to the access switching router of the local network.

After receiving this request, the access switch router responds with a router advertisement.

Judging by the information in the router advertisement whether it has moved, if it has moved, the mobile terminal will change the gateway to the network interface identifier of the access switching router in the router advertisement, and initiate an access request to enter the identity authentication process.

Embodiment four:

This embodiment is the authentication process described in Embodiment 3:

The access switch router can optimize the identity authentication process for mobile handover. For example, according to the geographic adjacency relationship between different access networks, adjacent access switch routers perform collaborative authentication, that is, adjacent switch routers jointly store the authentication information of a user terminal. When a user moves to an adjacent access network In the process, the user's authentication process is simplified by using the saved authentication information.

Embodiment five:

This embodiment is a refinement of the steps notified in the first embodiment. Its process can be described as:

After the mapping server receives a notification of a new identity mapping relationship when a user terminal moves to another access network, it notifies the user terminal of the last access network information stored in the user terminal. For switching routers, the notification contains the latest routing identifier assigned to the user terminal.

After receiving the mobile terminal movement notification sent by the mapping server, the access switch router that the mobile terminal accesses before moving sets the new routing identifier of the mobile terminal as a temporary handover identifier, and replaces all data packets sent to the mobile terminal with The latest route identification and forwarding of the mobile terminal.

The access switch router also notifies all the access switch routers where the mobile terminal's communication counterparts are located, of the new mapping relationship of the mobile terminal.

Embodiment six:

This embodiment is a refinement of the fifth embodiment. It is a specific step in the steps in which the access switch router notifies all the access switch routers where the communication peers of the mobile terminals are located of the new mapping relationship of the mobile terminal described in the fifth embodiment. The access switch router stores all the information of the communication counterparts for each locally accessed mobile terminal, and notifies the access switch router where the communication counterparts are located of the new identification mapping relationship of the mobile terminal according to the stored information. The number of communication peer records saved by the access switch router must be limited, and each record needs a delete timer to save memory space.

When the access switching router discovers the data packets between the local and other places, it checks whether the communication peer has been recorded in the identification mapping of the local user terminal. If yes then update the timer for this record. If not, create a new communication peer record. Therefore, when a message notifying that a local user terminal has moved is received, the local access terminal identification mapping record of the mobile user terminal is found, and the corresponding access switch router is found according to the communication peer recorded therein, and the user terminal The new routing identifier of the terminal is directly notified to the corresponding access switching router.

This embodiment can be described as the following steps:

1) Mark the corresponding user terminal as removed, set a deletion timer, and save its latest routing identifier. When the access router receives the data packet sent to the user terminal that has been removed, it replaces the routing identifier in it with the new routing identifier of the user terminal and forwards it, and notifies the access switch router where the source terminal of the data packet is located. The latest mapping relationship. After the deletion timer expires, the corresponding identity mapping relationship is deleted. Figure 5 illustrates the packet forwarding path in this case. The solid black arrows indicate the triangular route of the data packet sent from the communication peer to the moving user terminal. This situation only occurs when the access switch router accessed by the communication peer has not discovered that the user terminal has moved, and forwards the data packet according to the old identification mapping relationship.

2) Notify the mapping server according to the communication peer list recorded for each locally accessed user terminal, and the mapping server notifies each access switching router accessed by the communication peer according to the records in the list, and updates the mobile User terminal identification mapping relationship. Alternatively, the access switching router directly notifies the access switching routers connected by all communication peers.

In this step, firstly, the access switching routers are required to be able to save the records of the communication peers of all locally accessed user terminals; into the router. If the mapping server cannot provide help for forwarding notifications, then the access switch router must save the information of the access switch router where the communication peer is located. This requires appending some information to the data structure in the previous patented scheme. The following table is a possible organization form of the local access mapping table and the communication peer mapping table saved by the access switching router in this case. The use of these two tables in Table 1 must limit the maximum number of records at the communication peer. Otherwise, the pressure on the memory is too great. In addition, the record of each communication peer may also need a timer to determine that if there is no communication with the communication peer for a long time, the record of the communication peer should be deleted to save memory space. Therefore, the communication peer record of this table should be allocated dynamically. Step 2), specifically when using Table 1 and Table 2, may be as follows: first, all data packet forwarding needs to query these two mapping tables. In this search process, when it is found that the data packet is between a local user terminal and a user terminal in a foreign network, it is checked whether the communication peer has been recorded in the identification mapping of the local user terminal. If so, update the timer for this record. If not, create a new communication peer record. Secondly, when receiving a notice that a local user terminal has moved, find the local access terminal identification mapping record of the mobile user terminal, and find the corresponding access switch router from Table 2 according to the communication peer recorded therein , notifying the corresponding access switch router of the new routing identifier of the user terminal.

Table 1 Mapping table of local access terminal identifiers of access switching routers

Access ID Route ID Communication peer 1 … Communication peer N

Table 2 Peer mapping identifier mapping table of access switch router

Access ID Route ID access switch router timer

Embodiment seven:

This embodiment is another refinement of the fifth embodiment. In the fifth embodiment, there is such a problem that the records in Table 1 may take up too much memory. When each user terminal establishes communication connections with many communication peers at the same time, this may lead to the collapse of the access switching router. If the terminal identifier adopts a relatively long format (for example, 128 bits in IPv6), the same problem will be caused. So step 2) in the fifth embodiment can be replaced by the following steps:

All mobile terminals keep a list of communication peers, and send this list to the newly accessed access switching router after the movement occurs;

The sub-steps in which the access switch router notifies all the access switch routers where the communication counterparts are located of the new identification mapping relationship of the mobile terminal through the mapping server.

Each user terminal records all communicating peers. After moving, the user terminal sends the list of the communicating peers to the current access switch router. The current access switching router will send the list to the mapping server, and the mapping server is responsible for notifying the access switching router where each communication peer is located, and the movement of the user terminal.

Embodiment eight:

This embodiment is a refinement of the steps of avoiding routing black holes in Embodiment 1, in order to avoid forming routing black holes. So the following steps are required:

All user terminals must periodically send update notifications to the access switching routers in the local access network. The access switching router sets a timer for all locally accessed user terminals that have passed the identity authentication, and updates the timer of the corresponding user terminal each time it receives an update notification sent by the user terminal. If the timer of a user terminal expires, it is considered that the user terminal has been removed, or it is turned off, the corresponding identification mapping relationship is deleted, the routing identification therein is released, and the mapping server is notified.

If the notification of the new mapping relationship of the mobile terminal sent by the access switching router is earlier than the discovery that the user terminal is off the network, then the timer check will not continue to be performed on the user terminal until the local access identifier mapping of the user terminal is deleted; if the user terminal If the off-network is earlier than the notification of the new mapping relationship of the mobile terminal sent by the access switch router, no processing is performed.

Claims (8)

1. the implementation method of an integrated network mobile switch management, in the network system that it is characterized in that being applied to constitute by portable terminal, access switch router, authentication center, mapping server, wherein, insert switch router and be responsible for the access of terminal and the distribution of sign mapping relations, insert the mapping relations of sign and exchange Route Distinguisher in the mapping server maintaining network and provide inquiry service to couple in router and other mapping servers, authentication center is responsible for the user is carried out access control and authentication, and this method may further comprise the steps:

Step 1, detection and replacing mapping steps insert the switch router cycle and announce to self-administered Access Network broadcast router, and whether portable terminal is monitored and also received notice message, be moved according to content detection in the notice message self;

Or the mobility of portable terminal detected adopt another kind of mode, portable terminal to monitor that own bottom communication Link State incident finds moving of self;

After portable terminal is found self to move, again insert to new access switch router application, new access switch router is carried out authentication by authentication center to terminal, and distributes new sign mapping relations, announces the sign mapping relations that mapping server upgrades user terminal again;

After step 2, mapping server upgrade the sign mapping relations of portable terminal, enter the step of notice, comprise that mapping server notifies the access switch router that inserts this user terminal last time with the Route Distinguisher of the up-to-date distribution of user terminal, and insert the access switch router that switch router is notified the new mapping relations of portable terminal at all places, communications of Mobile Terminals opposite end;

Step 3, avoid because terminal closedown or leave and the step of network and the path black hole that causes when ignorant, insert switch router and judge according to the renewal announcement that all terminals regularly send whether terminal is left, if leave, the mode of taking to delete the sign mapping relations and announce mapping server avoids forming path black hole timely with this end message deletion.

2. the implementation method of a kind of integrated network mobile switch management according to claim 1 is characterized in that described step 1 may further comprise the steps:

The substep of step 1-1, broadcasting: insert the switch router cycle and announce to self-administered Access Network broadcast router, notice message comprises the network interface sign of Access Network one side that inserts switch router, the identification information of access switch router self at least;

The substep of step 1-2, the sign that discriminates one's identification: portable terminal is monitored and will be received that the identify label of access switch router in the notice message and the identify label of former preservation compare, if both are different, illustrate and taken place to move, preserve the identify label of new access switch router, the gateway of terminal is revised as this new access switch router network interface sign; If the same, do not illustrate and move; If the identify label of former access switch router does not exist, illustrate that inserting main frame just starts shooting;

Step 1-3, the substep that inserts of request again, portable terminal is asked access again to new access switch router after finding own moving;

The substep of step 1-4, authentication inserts switch router and by authentication center terminal is carried out authentication;

Step 1-5, be distributed into the substep of new sign mapping relations, insert switch router the access sign of redistributing Route Distinguisher and portable terminal by the portable terminal of authentication is made into new sign mapping relations, deposit in the local mapping table;

The substep of step 1-6, notice mapping server inserts the new sign mapping relations notice mapping server of switch router with portable terminal, allows terminal to carry out proper communication.

3. the implementation method of a kind of integrated network mobile switch management according to claim 1, it is characterized in that portable terminal in the described step 1 monitors that own bottom communication Link State incident finds that the mobile of self may further comprise the steps: step 1-1 ', the substep that monitors, portable terminal monitors the situation of own bottom communication link;

The substep of step 1-2 ', announcement request, when finding that link rebulids, initiatively the access switch router to local network sends a router advertisement request;

The substep of step 1-3 ', response announcement, the access switch router is just responded a router advertisement after receiving this request;

Step 1-4 ', judge whether the substep that moves, judge whether to have taken place to move by the information in this router advertisement, if be moved, portable terminal just changes gateway into the network interface sign of the access switch router in the router advertisement, and initiate to insert request, enter the authentication process.

4. the implementation method of a kind of integrated network mobile switch management according to claim 3 is characterized in that the verification process of described step 1-4 ' is:

According to the geographical syntople between the different access networks, work in coordination with authentication between the access switch router of adjacency, it is the common authentication information of preserving a user terminal of access switch router of adjacency, when the user moves in the adjacent access network, authenticate by the authentication information of having preserved.

5. the implementation method of a kind of integrated network mobile switch management according to claim 1 is characterized in that described step 2 may further comprise the steps:

Step 2-1, mapping server are after receiving that a user terminal moves to the announcement of new sign mapping relations of other access networks, access network information according to this user terminal place last time of storing, notify this user terminal access switch router that inserted last time, contain the Route Distinguisher of the up-to-date distribution of this user terminal in the announcement;

After the access switch router that step 2-2, portable terminal are inserted before moving is received the announcement that portable terminal that mapping server sends moves, the Route Distinguisher that portable terminal is new is made as the interim sign of delivering, all packets that mail to portable terminal are replaced with the up-to-date Route Distinguisher of portable terminal and transmit this locality access sign mapping relations of deletion portable terminal behind certain hour;

Step 2-3, notify the access switch router at all places, communications of Mobile Terminals opposite end with the new sign mapping relations of portable terminal, it has two kinds of implementations:

Insert the Correspondent Node information of switch router according to its record, the Route Distinguisher that user terminal is new is notified to the access switch router at Correspondent Node place;

Or portable terminal preserves the tabulation of a Correspondent Node, by the access switch router of the new access access switch router by the mapping server place, Route Distinguisher notifying communication opposite end that user terminal is new.

6. the implementation method of a kind of integrated network mobile switch management according to claim 5, it is characterized in that inserting the Correspondent Node information of switch router according to its record among the described step 2-3, the access switch router that the Route Distinguisher that user terminal is new is notified to the Correspondent Node place may further comprise the steps:

Step 2-3-1, each bar Correspondent Node of preserving in inserting switch router are provided with a deletion timer in writing down, when the access switch router was found to commute the packet in local and other places, whether inspection had write down this Correspondent Node in the sign mapping of LUT;

, upgrades step 2-3-2 the timer of this record if having existed, if just do not build a new Correspondent Node record;

Step 2-3-3, when receiving the message that a local user terminal of announcement is moved, find the local access terminal identification map record of the user terminal that is moved, according to the Correspondent Node that wherein writes down, find corresponding access switch router, the Route Distinguisher that user terminal is new is directly announced and is given corresponding access switch router.

7. the implementation method of a kind of integrated network mobile switch management according to claim 5, it is characterized in that, portable terminal is preserved the tabulation of a Correspondent Node among the described step 2-3, be may further comprise the steps by the access switch router of the new access access switch router by the mapping server place, Route Distinguisher notifying communication opposite end that user terminal is new:

Step 2-3-1 ', all portable terminals are preserved the tabulation of a Correspondent Node, this tabulation are sent to the access switch router of new access after being moved;

Step 2-3-2 ', by new access switch router by mapping server, the sign mapping relations that portable terminal is new are notified the access switch router at all Correspondent Node places.

8. the implementation method of a kind of integrated network mobile switch management according to claim 1 is characterized in that described step 3 may further comprise the steps:

Step 3-1, the user terminals that pass through authentication for all local accesses in inserting switch router are provided with a timer, all user terminals regularly send the renewal announcement to the access switch router of local access network, if the timer of a user terminal expires, think that then this user terminal removes, perhaps shutdown, deletion corresponding identification mapping relations discharge Route Distinguisher wherein, and the notice mapping server;

If step 3-2 inserts switch router and receives that the local mobile terminal of mapping server transmission inserts the announcement that switch router have inserted again at other, with regard to no longer continuing this user terminal is carried out the timer inspection so, insert the sign mapping up to this locality of deletion user terminal; If that finds user terminal inserts the announcement that switch router have inserted again at other from net early than the local mobile terminal of receiving the mapping server transmission, then do not handle it.

Images