CN102123378A

CN102123378A - Method for switching terminal and corresponding communication network

Info

Publication number: CN102123378A
Application number: CN2010100022534A
Authority: CN
Inventors: 周娜; 吴强; 符涛
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-01-12
Filing date: 2010-01-12
Publication date: 2011-07-13
Anticipated expiration: 2030-01-12
Also published as: WO2011085618A1; CN102123378B

Abstract

The invention discloses a method for switching a terminal and a corresponding communication network. The communication network comprises a wireless side network element, an access gateway which is connected between the wireless network element and a packet data network, a mobility management node and an identity position register. In the process of switching the terminal, when a target access gateway different from the original access gateway is determined, the target access gateway allocates the identifier of a new position for the terminal and saves the mapping information of the identifier of the identity of the terminal and the identifier of the new position; a target mobility management node or the target access gateway initiates registration and updates the identifier of the position of the terminal in the identity position register to which the terminal belongs; and the terminal is switched from the original wireless side network element to a target wireless side network element, and is connected to the packet data network by the target wireless side network element and the target access gateway, so that data messages is encapsulated and forwarded between the terminal and a communication opposite end. Through the invention, the route detours of data packets can be reduced, transmission delay and bandwidth waste can be lowered.

Description

Method and corresponding communication network that a kind of terminal is switched

Technical field

The present invention relates to communication technical field, relate in particular to method and corresponding communication network that a kind of terminal is switched.

Background technology

Third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) grouping system (the Evolved Packet System of evolution, abbreviate EPS as) by universal mobile telecommunications system land radio access web (the Evolved Universal Terrestrial Radio AccessNetwork of evolution, abbreviate E-UTRAN as), Mobility Management Entity (Mobility Management Entity, abbreviate MME as), gateway (Serving Gateway, S-GW), grouped data network gateway (Packet Data Network Gateway, abbreviate P-GW or PDN GW as), home subscriber server (Home Subscriber Server, abbreviate HSS as), authentication and authorization charging (the Authentication of 3GPP, Authorization and Accounting, abbreviate AAA as) server, "Policy and Charging Rules Function (Policy and Charging Rules Function abbreviates PCRF as) entity and other support nodes are formed.

Fig. 1 a is the schematic diagram of the EPS system architecture of prior art, and as shown in the figure, MME is responsible for the related work of chains of command such as the processing of mobile management, Non-Access Stratum signaling and the contextual management of user's mobile management; S-GW is the accessing gateway equipment that links to each other with E-UTRAN, transmits data between E-UTRAN and P-GW, and is responsible for pending datas such as paging are carried out buffer memory; P-GW then is the borde gateway of EPS and packet data network (Packet Data Network abbreviates PDN as) network, and the access of being responsible for PDN reaches functions such as transmitting data between EPS and PDN.

In 3GPP, can find corresponding PDN network by APN (Access Point Name abbreviates APN as).Usually UE is called the session of an IP connection Access Network (IP Connectivity Access Network abbreviates IP-CAN as) to a connection of PDN network.

When terminal is moved, the anchor point (shown in Fig. 1 b) that P-GW will move as terminal.On the basis of Fig. 1 b system, terminal is carried out handoff procedure (shown in Fig. 1 c) in the prior art, the flow process concrete steps of carrying out data forwarding by interface between the S-GW are described below:

Step 1c01, wireless side network element judge that needing to send S1 switches;

Step 1c02, former wireless side network element sends handoff request to former MME;

Step 1c03, former MME is changeing request message before target MME sends reorientation;

Step 1c04, target MME sends session to target S-GW and sets up request, band P-GW relevant information;

Step 1c05, target S-GW replys session to target MME and sets up response message,

This step can be carried tunnel information such as the Tunnel Identifier of target S-GW for tunnel distributing between foundation and Target Wireless side network element.

Step 1c06, target MME request target wireless side network element carry out and switch;

This step can pass to Target Wireless side network element with the tunnel information that target S-GW distributes.

Step 1c07, Target Wireless side network element is responded switching request acknowledgement message to target MME;

This step, Target Wireless side network element is created UE context and reserved resource, in switching request acknowledgement message, carry tunnel information that Target Wireless side network element distributes (be herein for set up and target S-GW between tunnel distributing), also need to carry the forwarding tunnel information between the S-GW.

Step 1c08, target MME send to target S-GW and transmit tunnel foundation request, and the data forwarding tunnel between the S-GW is set up in request;

Step 1c09, target S-GW reply to target MME and transmit tunnel foundation response, carry the forwarding Tunnel Identifier into the forwarding tunnel distributing between the S-GW;

Step 1c10, target MME changes response message before former MME sends reorientation;

Step 1c11, former MME send to former S-GW and transmit tunnel foundation request, and the data forwarding tunnel between the S-GW is set up in request, carries the forwarding Tunnel Identifier that target S-GW distributes;

Step 1c12, former S-GW reply former MME and transmit tunnel foundation response;

Step 1c13, former MME sends switching command to former wireless side network element;

Step 1c14, former wireless side network element sends switching command to terminal;

At this moment, the downlink data message of issuing this terminal that former network is received will mail to objective network from the forwarding tunnel between the S-GW;

Step 1c15, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 1c16, Target Wireless side network element notification target MME switches;

Notification message is finished in step 1c17, target MME commentaries on classics before former MME sends reorientation;

Acknowledge message is finished in step 1c18, former MME commentaries on classics before target MME replys reorientation;

Step 1c19, target MME request target S-GW revises beared information, carries tunnel information such as Tunnel Identifier that Target Wireless side network element distributes; After target S-GW received this tunnel information, if the S-GW reorientation, then target S-GW sent to P-GW and revises bearing request message, carries the tunnel information that target S-GW distributes;

After this step target S-GW receives the tunnel information of Target Wireless side network element distribution, just set up the tunnel that arrives between Target Wireless side network element, be used to send the downlink data message of this terminal, be called downlink tunnel for this terminal.In step 1c06, after Target Wireless side network element is received the tunnel information of target S-GW distribution, just set up the tunnel that arrives between target S-GW for this terminal, can send the uplink data messages of this terminal, be called uplink tunnel.The mode of setting up the tunnel in the literary composition everywhere between two network elements is similarly, repeats no more.

Step 1c20, if the S-GW reorientation, then target P-GW responds the bearing modification result to target S-GW.Target S-GW responds the bearing modification result to target MME;

Step 1c21 carries out former BlueDrama deletion and transmits tunnel release flow process.This flow process can be triggered by timer by former MME.

This shows that prior art has only been considered to adopt anchored mode to realize continuity professional in the terminal moving process, yet this fixed anchor point method has caused the circuitous problem of packet path, has increased the weight of transmission delay and bandwidth waste.

Be in the question essence of above-mentioned existence that the community of the address of TCP/IP and identity causes.In order to address these problems, industry has proposed multiple new mobile management technology at present.Its essential idea is user identity and position isolation technics.Existing relevant identify label separates (SILSN:Subscriber Identifier ﹠amp in the prior art with the position; Locator Separation Network) solution, as Host Based realization such as HIP technology, and based on the realization such as location identity separated protocol (LISP) technology of router, there are relevant multiple technologies to support again in every kind of realization, terminal use's identify label in these schemes (being expressed as AID in the literary composition) does not change in moving process, realizes the route and the forwarding of data message according to the position otherwise allocated station location marker (being expressed as RID in the literary composition) of terminal.

Fig. 1 d shows a kind of identify label and locator separation network (Subscriber Identifier ﹠amp; LocatorSeparation Network, abbreviation SILSN) framework, the network topology of this SILSN framework is divided into does not have overlapping Access Network and backbone network on the topological relation, Access Network is positioned at the edge of backbone network, be responsible for the access of all terminals, the route and the forwarding of the inter-terminal data message that backbone network is responsible for inserting.In the network, the User Identity with AID represents terminal remains constant in the terminal moving process; Represent that with RID network is the station location marker of terminal distribution, uses at backbone network.It should be noted that identify label can have different titles with station location marker at different SILSN frameworks, should be considered as being equal to.

In the SILSN framework, terminal can be one or more in portable terminal, fixed terminal and the roam terminals, as mobile phone, landline telephone, computer and server or the like.

In the SILSN framework, Access Network is used to terminal that two layers of (physical layer and link layer) access means, the physics access link between maintenance terminal and the ASN are provided.

In the SILSN framework, the main network element of backbone network comprises:

Access service node (ASN:Access Service Node) is used to terminal distribution RID, the AID-RID map information of maintenance terminal, RID to ILR registration (also can be described as registration) and inquiry terminal, and the route and the forwarding that realize data message, terminal must insert backbone network through ASN.The RID that ASN distributes points to this ASN, also promptly comprises the address information of this ASN, and during as the destination address of data message, this data message will be routed to this ASN with this RID.

Generic router (CR:Common Router) is used for carrying out routing according to the RID of data message, and transmitting with RID is the data message of destination address.

Identity location register (ILR:Identity Location Register), ILR is used to handle registration, cancellation and the inquiry to terminal RID, preserves and safeguard the identify label and station location marker (AID-RID) map information of home subscriber terminal;

Alternatively, backbone network can also comprise:

Packet forward function (PTF:Packet Transfer Function), be also referred to as the packet forward functional node, be used for after receiving the data message that the home subscriber terminal sends, after finding the RID of Correspondent Node and be encapsulated in header according to Correspondent Node AID in the data message, be forwarded to the broad sense Forwarding plane.

Interconnect services node (ISN) has the interface with generic router, ASN and ILR, is used to realize interconnecting of two networks.

Above-mentioned ILR, or ILR and PTF constituted the mapping Forwarding plane of backbone network, CR, or CR and ISN have constituted the broad sense Forwarding plane of backbone network.

Based on the network of SILSN framework, because the identify label of terminal separates with the position, terminal and Correspondent Node are discerned the other side by AID, use RID to realize the route and the forwarding of data message.When terminal moved, AID was constant, and keeping the correspondence of terminal and Correspondent Node, RID can move and redistributes with terminal, thereby can support terminal have the mobility of fixed anchor point, solved the circuitous problem of packet path.

When communicating in the SILSN framework, ASN receives that uplink data messages will carry out RID encapsulation and transmit.Particularly, at the RID of local search Correspondent Node, as inquire, with the RID of Correspondent Node as destination address, with terminal RID is that source address is encapsulated in the data message that comprises terminal AID and Correspondent Node AID, is forwarded to the ASN that Correspondent Node inserts through the broad sense Forwarding plane.As inquiry less than, arrive Correspondent Node and belong to ILR and inquire the RID of Correspondent Node and be kept at this locality.At this moment, after the RID of terminal can be encapsulated, be forwarded to the broad sense Forwarding plane by the mapping Forwarding plane, perhaps in message, after inquiring the RID of Correspondent Node, carry out the RID encapsulation and transmit and handle in the mode of local search during by above-mentioned by this ASN again to the RID of Correspondent Node.At down direction, ASN separates the RID encapsulation after receiving the data message that the broad sense Forwarding plane sends, and sends to terminal after peelling off RID wherein.

As can be seen, ASN need be this terminal distribution RID in order to realize the normal forwarding of message when terminal inserts, register this RID to upgrade the RID of this terminal among the ILR to ILR.ASN also needs the AID-RID map information of maintenance terminal and Correspondent Node thereof, realizes the RID encapsulation to message.In one example, ASN safeguards the correspondence information of this terminal and Correspondent Node for each terminal, be called in the literary composition this terminal to client information, this opposite end information comprises the correspondence relationship information of this terminal AID and Correspondent Node AID, the AID-RID map information that can also comprise this terminal, simultaneously, the unified AID-RID map information of safeguarding the Correspondent Node of all terminals of ASN.Certainly, ASN safeguards respectively that for each terminal the AID-RID map information of these all Correspondent Nodes of terminal also is fine, wherein comprised terminal to client information.Maintenance is for when terminal is switched to client information, and the ASN that cuts a side can determine which Correspondent Node is this terminal have, thereby can send the new RID of this terminal to the ASN that Correspondent Node inserts.After the ASN that Correspondent Node inserts finished renewal, just the data message that Correspondent Node can be sent had been routed directly to ASN that this terminal switches to.But the RID that does not proceed to the opposite end upgrades, and opposite end P-GW also can upgrade the RID of this terminal by the modes such as inspection of message that terminal is sent.

But, prior art for how in the handoff procedure of the communication system that chains of command such as LTE separate with the medium face identify label of support terminal separate with the position, it is circuitous to avoid occurring route, does not all propose corresponding implementation.

Summary of the invention

The technical problem to be solved in the present invention provides method and the corresponding communication network that a kind of terminal is switched, and is circuitous with the path of reducing packet, reduces transmission delay and bandwidth waste.

In order to address the above problem, the invention provides the method that a kind of terminal is switched, be applied to comprise the wireless side network element, be connected the communication network of IAD, mobile management node and identity location register (ILR) between wireless side network element and the packet data network, this method comprises:

In terminal switching process, when having determined the target access gateway different with former IAD, this target access gateway is new station location marker (RID) of this terminal distribution and the map information of preserving this terminal identity sign (AID) and this new RID; Target MMN or target access gateway are initiated the RID registration, and the RID of this terminal among this terminal attaching ILR is updated to new RID;

This terminal is connected to packet data network by this Target Wireless side network element and target access gateway after switching to Target Wireless side network element from former wireless side network element, realizes the encapsulation and the forwarding of data message between this terminal and Correspondent Node.

Further, said method also can have following characteristics:

Behind this target access gateway has been this terminal distribution new RID, also the gateway that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal; Perhaps

Behind this target access gateway has been this terminal distribution new RID, the RID that this is new sends to target MMN, and this target MMN sends the RID update notification to the MMN that the Correspondent Node of this terminal inserts, and carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

After having determined the target access gateway different, also set up the forwarding tunnel between this target access gateway and the former IAD with former IAD;

After this transmits tunnel foundation, after this former IAD receives that Correspondent Node is issued the data message of this terminal, be forwarded to this target access gateway by this forwarding tunnel, this this data message of target access gateway buffer memory or be forwarded to Target Wireless side network element buffer memory, after this terminal switches to this Target Wireless side network element, by this Target Wireless side network element data message is sent to this terminal again.

Further, said method also can have following characteristics:

IAD maintenance terminal in the described communication network to client information, and the AID-RID map information of all Correspondent Nodes of terminal, described opposite end information comprises the correspondence relationship information of this terminal AID and Correspondent Node AID;

In handoff procedure, the AID-RID map information to client information and/or these all Correspondent Nodes of terminal of this terminal that former IAD will be safeguarded is sent to this target access gateway;

This target access gateway for this terminal distribution new RID and receive describedly to behind the client information, the gateway that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

Described communication network is grouping system (EPS) network of evolution, the function of described IAD realizes by the gateway in the EPS network (S-GW) and grouped data network gateway (P-GW), and described MMN is Mobility Management Entity (MME) in the EPS network or the Serving GPRS Support Node (SGSN) in the 3G system.

Further, said method also can have following characteristics:

After the switching of S1 interface was initiated, target P-GW that target MMN determines and former P-GW were sent to this target P-GW with the AID of this terminal and the address information of former P-GW through target S-GW not simultaneously; After this target P-GW receives, point to the new RID of this P-GW for this terminal distribution, preserve the map information of this terminal AID and this new RID, and directly or indirectly the tunnel information that distributes is sent to former P-GW, set up the forwarding tunnel of this terminal between this target P-GW and former P-GW;

Afterwards, former MMN starts hand-off execution process, this terminal switches to Target Wireless side network element, is connected to packet data network by this Target Wireless side network element, target S-GW and target P-GW, connects encapsulation and the forwarding that realizes data message between this terminal and Correspondent Node by this.

Further, said method also can have following characteristics:

After this target P-GW is the new RID of this terminal distribution, send the RID register requirement, carry this terminal AID and new RID to terminal attaching ILR; Perhaps, after this target P-GW was the new RID of this terminal distribution, the RID that this is new was sent to this target MMN through target S-GW, and this target MMN sends the RID register requirement to this terminal attaching ILR, carries this terminal AID and new RID;

RID in this terminal AID-RID map information that will preserve after this terminal attaching ILR receives is updated to this new RID.

Further, said method also can have following characteristics:

The AID of this terminal and the address information of former P-GW are the session requests of setting up that sends to this target S-GW by this target MMN, and this target S-GW receives that session sets up the request back and be sent to this target P-GW's to the session request of setting up that this target P-GW sends;

Behind the tunnel distributing tunnel information of this target P-GW for this terminal between foundation and target S-GW, reply session to this target S-GW and set up response; This target S-GW replys session to this target MMN and sets up response;

This target MMN asks this Target Wireless side network element to carry out switching again, and this Target Wireless side network element is responded switching request acknowledgement message to this target MMN.

Further, said method also can have following characteristics:

The data forwarding passage of this terminal is set up by following process between this target P-GW and former P-GW: this target P-GW transmits the tunnel by the signaling interface between P-GW to this former P-GW transmission and sets up request, carries the forwarding tunnel information of target P-GW for the forwarding tunnel distributing of this terminal between foundation and former P-GW; After this former P-GW receives, reply the forwarding tunnel to this target P-GW and set up response.

Further, said method also can have following characteristics, and the data forwarding passage of this terminal is set up by following process between this target P-GW and former P-GW:

This target MMN sets up to this target P-GW request by this target S-GW and transmits the tunnel, after this target P-GW receives, transmit Tunnel Identifier for the forwarding tunnel distributing of this terminal between foundation and former P-GW, should transmit Tunnel Identifier by this target S-GW and send this target MMN to;

This target MMN and former MMN should transmit Tunnel Identifier and be delivered to this former MMN not simultaneously;

This former MMN sends to this former P-GW by this former S-GW and transmits tunnel foundation request, carries this forwarding Tunnel Identifier; After this former P-GW received, the forwarding tunnel of this terminal between foundation and this target P-GW was replied forwarding tunnel by this former S-GW to this former MMN and is set up response.

Further, said method also can have following characteristics:

This target MMN asks set up forwarding tunnel to the session of this target P-GW transmission request of setting up to this target P-GW to session foundation request and this target S-GW that this target S-GW sends by this target MMN; The session foundation response that the session foundation that this target P-GW replys to this target S-GW by this target P-GW responds and this target S-GW replys to this target MMN should be transmitted Tunnel Identifier and be sent this target MMN to; Perhaps, this target MMN is behind the Handover Request Acknowledge of receiving the response of Target Wireless side network element, asks set up forwarding tunnel to the foundation request of the forwarding tunnel of this target P-GW transmission to this target P-GW to the foundation request of forwarding tunnel and this target S-GW that this target S-GW sends by this target MMN; This target P-GW sets up response and this target S-GW by this target P-GW to the forwarding tunnel that this target S-GW replys to set up response to the forwarding tunnel that this target MMN replys and should transmit Tunnel Identifier and send this target MMN to;

This target MMN and former MMN should transmit Tunnel Identifier by commentaries on classics response message before the reorientation and be delivered to this former MMN not simultaneously.

Further, said method also can have following characteristics:

P-GW in this communication network preserve the terminal that inserts to client information; In handoff procedure, this terminal that this former P-GW will preserve client information is sent to this target P-GW, this target P-GW for this terminal distribution new RID and receive described to behind the client information, the gateway that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal; Perhaps

MMN in this communication network preserve the terminal that inserts to client information; In handoff procedure, former MMN and target MMN not simultaneously, with this terminal of preserving client information is sent to this target MMN, after this target MMN received described this new RID that client information and target P-GW are sent, the RID that is initiated to the opposite end is new technological process more.

Further, said method also can have following characteristics:

P-GW in this communication network safeguard and preserve the terminal that inserts to client information; This former P-GW is sent to this target P-GW by what transmit that the tunnel sets up this terminal that response will safeguard to client information;

This target P-GW inquires about the RID that obtains described Correspondent Node according to the AID to Correspondent Node in the client information of this terminal, and the gateway that inserts to described Correspondent Node sends the RID update notification, carries AID and this new RID of this terminal; Perhaps, this target P-GW again will this new RID and described client information is sent to this target MMN, and after this target MMN received described this new RID that client information and this target P-GW are transmitted, the RID that is initiated to the opposite end is new technological process more.

Further, said method also can have following characteristics:

P-GW in this communication network safeguard and preserve the terminal that inserts to client information; This former P-GW is sent to this former MMN to client information through former S-GW by what transmit that the tunnel sets up this terminal that response will safeguard, this former MMN and target MMN are not simultaneously, finish acknowledge message and with described client information be sent to this target MMN by changeing before the reorientation, this target MMN sends to the modification carrying request of this target S-GW by this MMN again and modification carrying that this target S-GW sends to this target P-GW asks with described client information to be sent to this target P-GW;

This target P-GW inquires about the RID that obtains described Correspondent Node according to the described AID to Correspondent Node in the client information that receives, the gateway that inserts to described Correspondent Node sends the RID update notification, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

MMN in this communication network preserve according to the notice of P-GW and more new terminal to client information;

In handoff procedure, before forwarding tunnel between former P-GW and target P-GW is set up, this former P-GW separates RID encapsulation to the data message of receiving of issuing this terminal and checks, this terminal that needs are upgraded notify former MMN to client information, former MMN upgrades preserve described to client information; After this transmits tunnel foundation, the data message that this former P-GW will issue this terminal directly is transmitted to this target P-GW, this target P-GW separates the RID encapsulation to this data message and checks, this terminal that needs are upgraded to client information notification target MMN, this target MMN upgrades preserve described to client information;

In handoff procedure, former MMN and target MMN are not simultaneously, by change before the reorientation finish this terminal that acknowledge message will safeguard client information is sent to this target MMN, this target MMN will receive and describedly client information be merged into unified to client information to client information and local preserve described that the RID that is initiated to the opposite end according to the AID to Correspondent Node in the client information after merging is new technological process more.

Further, said method also can have following characteristics:

The RID that this target MMN is initiated to the opposite end is more during new technological process, be the AID of Correspondent Node in the client information to be obtained the MMN that Correspondent Node inserts from this locality configuration or Correspondent Node attribution server or dns server inquiry according to this terminal, the MMN that inserts to described Correspondent Node sends the RID update notification, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

This terminal that this former P-GW will preserve client information is sent in the process of this target P-GW is sent to this target P-GW with described to client information with the AID-RID map information of these all Correspondent Nodes of terminal.

Further, said method also can have following characteristics:

In handoff procedure, before forwarding tunnel between former P-GW and target P-GW was set up, this former P-GW separated the RID encapsulation to the data message of receiving of issuing this terminal and checks, safeguard this terminal of preserving to client information; Transmit after tunnel sets up at this, the data message that this former P-GW will issue this terminal directly is transmitted to this target P-GW, this data message is separated the RID encapsulation and is checked by this target P-GW, preserve in this locality and safeguard this terminal to client information;

This target P-GW receive this terminal that former P-GW sends to behind the client information, with receive described to client information and local preserve described client information is merged into unified to client information and safeguard.

Further, said method also can have following characteristics:

In handoff procedure, this former P-GW by this terminal that will preserve with the forwarding tunnel of this target P-GW to client information before this target P-GW transmits, this former P-GW separates RID encapsulation to the data message of receiving of issuing this terminal and checks, safeguard this terminal of preserving to client information; Transmit describedly to after the client information, the data message forwarding of issuing this terminal that this former P-GW will receive is given this target P-GW, this data message is separated the RID encapsulation and is checked by this target P-GW, safeguard this terminal to client information.

Further, said method also can have following characteristics:

In handoff procedure, after the forwarding tunnel between this target P-GW and the former P-GW was set up, the data message of issuing terminal that former P-GW receives flows to and is: former P-GW-＞target P-GW-＞target S-GW, data message were buffered among the target S-GW; The data message of issuing terminal that target P-GW receives flows to and is: target P-GW-＞target S-GW, data message will be buffered among the target S-GW;

This terminal switches to Target Wireless side network element, and after this target S-GW sets up carrying with this Target Wireless side network element according to the modification of this target MMN carrying request, again the data in buffer message is sent to this terminal through this Target Wireless side network element.

Further, said method also can have following characteristics:

In handoff procedure, before the forwarding tunnel of setting up between this target P-GW and the former P-GW, target MMN mutual by with Target Wireless side network element and target S-GW is for this terminal is set up tunnel between this Target Wireless side network element and this target S-GW;

In handoff procedure, after forwarding tunnel between this target P-GW and the former P-GW is set up, the data message of issuing terminal that former P-GW receives flows to and is: former P-GW-＞target P-GW-＞target S-GW-＞Target Wireless side network element, data message are buffered in the Target Wireless side network element; The data message of issuing terminal that target P-GW receives flows to and is: target P-GW-＞target S-GW-＞Target Wireless side network element, data message will be buffered in the Target Wireless side network element;

After this terminal switched to this Target Wireless side network element, this Target Wireless side network element sent to this terminal with the data in buffer message.

Further, said method also can have following characteristics:

In handoff procedure, only set up descending forwarding tunnel between this target P-GW and the former P-GW; Before this terminal switches to Target Wireless side network element, the flow direction of the data message that this terminal sends is: this terminal-＞former wireless side network element-＞former S-GW-＞former P-GW, former P-GW carries out RID encapsulation to this data message and checks, that safeguards this terminal notifies former MMN to what client information maybe will need this terminal of upgrading to client information.

Further, said method also can have following characteristics:

In handoff procedure, this former P-GW by this terminal that will preserve with the forwarding tunnel of this target P-GW to client information before this target P-GW transmits, the flow direction of the data message that this terminal sends is: this terminal-＞former wireless side network element-＞former S-GW-＞former P-GW, former P-GW carries out RID encapsulation to this data message and checks, safeguard this terminal to client information;

This former P-GW transmit described to after the client information and this terminal switch to before the Target Wireless side network element, the flow direction of the data message that this terminal sends be this terminal-＞former wireless side network element-＞former S-GW-＞former P-GW-＞target P-GW, target P-GW carries out RID encapsulation to this data message and checks, safeguard this terminal to client information.

Further, said method also can have following characteristics:

Target MMN or target S-GW determine target P-GW according to zone, terminal position and/or network configuration information, and perhaps, target MMN or target S-GW determine target P-GW according to the indication of terminal or wireless side network element.

Further, said method also can have following characteristics, in this handoff procedure with terminal being connected foundation, discharging relevant processing and comprise to former side between the packet data network and target side:

After the switching of described S1 interface is initiated, after former MMN receives the handoff request that former wireless side network element sends, at this former MMN and target MMN not simultaneously, before target MMN transmission reorientation, change request message, carry the address of former P-GW;

This target MMN carries out reorientation to S-GW and P-GW, and when being reoriented to the target P different with former P-GW-GW, flow process is set up in the session that is initiated to S-GW and P-GW;

This target MMN request target wireless side network element is carried out and is switched, and this Target Wireless side network element is responded switching request acknowledgement message to this target MME;

This target MMN and former MMN change response message not simultaneously before former MME sends reorientation, former MMN notifies this terminal to switch by former wireless side network element;

This Target Wireless side network element notifies this target MMN to switch after receiving the switch acknowledgment message of this terminal, this target MMN and former MMN are not simultaneously, change before this former MME sends reorientation and finish notification message, acknowledge message is finished in this former MME commentaries on classics before this target MME replys reorientation;

This target MMN request target S-GW revises beared information, and this target S-GW responds the bearing modification result to this target MMN; Former network side is carried out former BlueDrama deletion and is transmitted the tunnel and discharges flow process, comprises the tunnel between former S-GW and the former P-GW.

Further, said method also can have following characteristics:

In terminal switching process, target MME does not change the P-GW of the former access of terminal when determining target P-GW, and this target MME sends session to target S-GW and sets up request, the Tunnel Identifier that distributes with this P-GW address and this P-GW; Target S-GW sends session to P-GW and sets up request, carries the tunnel information of this target S-GW for the tunnel distributing between foundation and this P-GW, and this P-GW preserves the tunnel information of former S-GW and target S-GW simultaneously, sets up the tunnel of this terminal between this P-GW and target S-GW;

In handoff procedure, after the tunnel of this terminal was set up between this P-GW and target S-GW, the data message of issuing this terminal that this P-GW will receive was transmitted to target S-GW through this tunnel; Perhaps, the forwarding tunnel between former S-GW or target S-GW is set up in this target MME control, and the data message of issuing this terminal that this P-GW will receive is issued former P-GW, and former P-GW is transmitted to target S-GW through this forwarding tunnel again.

Correspondingly, the communication network that chain of command provided by the invention separates with the medium face comprises wireless side network element, IAD, and and wireless side network element and IAD between have the mobile management node (MMN) of signaling interface, has data-interface between described IAD and wireless side network element and the external packet data network, be used to transmit the data between wireless side network element and packet data network, it is characterized in that, also comprise the identity location register (ILR) that has signaling interface with described IAD and/or MMN, wherein:

Described MMN is used to carry out the relevant treatment of chain of command, when having determined a target access gateway different with former IAD for the incision terminal, the identify label (AID) of this incision terminal is sent to this target access gateway;

Described IAD is used for behind the AID that receives the incision terminal that target MMN transmits, for the new station location marker of this terminal distribution (RID) and preserve the map information of this terminal AID and this new RID, and the data message of this incision terminal carried out the RID encapsulation, separates that RID encapsulates and forwarding;

Described IAD or MMN also are used for sending register requirement to incision terminal attaching ILR, carry the new RID of this incision terminal;

Described ILR is used to safeguard the AID-RID map information of home subscriber terminal, receive register requirement to the incision terminal after, the RID of this incision terminal of preserving is updated to this new RID.

Further, above-mentioned communication network also can have following characteristics:

It is being the incision terminal distribution behind the new RID that described IAD also is used for, and the RID that this is new is sent to target MMN;

Described MMN also is used for behind the new RID that receives the incision terminal, and the gateway that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

Described MMN also is used for after determining to be different from the target access gateway of former IAD, and is mutual with target access gateway and former IAD, sets up the forwarding tunnel of incision terminal between this target access gateway and former IAD; Perhaps, described IAD also is used for by the signaling interface between IAD, for the incision terminal is set up forwarding tunnel between this IAD and former IAD;

Described IAD also is used for after this forwarding tunnel is set up the data message of receiving that cuts out terminal of issuing being forwarded to this target access gateway by this forwarding tunnel; Be forwarded to Target Wireless side network element again after directly being forwarded to Target Wireless side network element or buffer memory after receiving the data message of issuing the incision terminal;

After directly sending to this incision terminal or buffer memory, the data message of issuing the incision terminal that described Target Wireless side network element is used for receiving sends to this incision terminal.

Described IAD also be used for maintenance terminal to client information, comprise the correspondence relationship information of this terminal AID and Correspondent Node AID; In handoff procedure, with safeguard cut out terminal client information is sent to this target access gateway; And for the incision terminal distribution new RID and receive this incision terminal that former IAD sends to behind the client information, to gateway transmission RID update notification that Correspondent Node of this incision terminal inserts, carry AID and this new RID of this terminal.

Described MMN comprises:

Cut out control module, be used for after S1 switch to initiate, request target MMN reorientation, and the AID that will cut out terminal is sent to target MMN; Notify this to cut out terminal by former wireless side network element and carry out switching, and after switching is finished, carry out former BlueDrama deletion and forwarding tunnel and discharge flow process;

The incision control module is used for after receiving re-positioning request determining target S-GW and target P-GW, when having determined target S-GW different with former S-GW and the target P different with former P-GW-GW, the AID of incision terminal is sent to this target P-GW through target S-GW; And mutual with Target Wireless side network element and target S-GW, be incision terminal foundation tunnel between the two;

Described P-GW comprises:

The incision control module is used for behind the AID and former P-GW address information that receive the incision terminal that target MMN transmits, points to the new RID of this P-GW for this terminal distribution, preserves the map information of this terminal AID and this new RID;

Packet forwarding module is used for the data message of cutting, cut out terminal is carried out the RID encapsulation, separates the RID encapsulation and transmits processing;

Module is set up in first tunnel, is used to the forwarding tunnel between foundation of incision terminal and target S-GW;

Described S-GW is used to the tunnel between the foundation of incision terminal and target P-GW and Target Wireless side network element, carries out data message forwarding, and transmits mutual information between MMN and the P-GW.

Described P-GW also comprises the RID Registering modules; The incision control module of described P-GW also be used for for the incision terminal distribution activate this RID Registering modules behind the new RID; This RID Registering modules is used for sending register requirement to incision terminal attaching ILR, carries the AID of this incision terminal and new RID; Perhaps

It is being the incision terminal distribution behind the new RID that the incision control module of described P-GW also is used for, and the RID that this is new is sent to target MMN through target S-GW; Described MMN also comprises the RID Registering modules, is used for behind the new RID that receives the incision terminal, and ILR sends register requirement to the incision terminal attaching, carries the AID of this incision terminal and new RID.

The incision control module of described MMN also is used for the address information of former P-GW is sent to this target P-GW with the AID that cuts terminal;

Described P-GW comprises that also second tunnel sets up module; Incision control module among the described P-GW also is used for activating described second tunnel and setting up module for having cut terminal distribution behind the new RID;

Described second tunnel is set up module and is used for sending the foundation request of forwarding tunnel by the signaling interface between P-GW to former P-GW, carries the tunnel information of this P-GW for forwarding tunnel distributing between foundation of incision terminal and former P-GW; And, receive that target P-GW sends for cut out terminal set up transmit the tunnel and set up request after, reply to target P-GW and to transmit the tunnel and set up and respond.

Described MMN comprises that also the tunnel sets up module, be used for after having determined to be different from target P-GW of former P-GW, set up the forwarding tunnel of incision terminal between former P-GW and target P-GW by target S-GW to the request of target P-GW, this target P-GW is delivered to former MMN for the forwarding Tunnel Identifier of this forwarding tunnel distributing; And, receive that target P-GW is after cutting out the forwarding Tunnel Identifier of terminal distribution, send to former P-GW by former S-GW and transmit tunnel foundation request, carry this forwarding Tunnel Identifier;

Described P-GW comprises that also second tunnel sets up module, is used to receive that target MMN send for after the incision terminal sets up the request of transmitting the tunnel between former P-GW and target P-GW, should transmit the forwarding Tunnel Identifier in tunnel for this incision terminal distribution; And receiving that former MMN crosses after to transmit target P-GW that the tunnel request of setting up carries be to cut out the forwarding Tunnel Identifier of terminal distribution, set up with this target P-GW between the forwarding tunnel, and reply to this former MMN by former S-GW and to transmit tunnel and set up and respond.

Described P-GW also comprises opposite end maintenance of information module, cuts out control module and RID update module;

Opposite end maintenance of information module among the described P-GW be used to preserve with maintenance terminal to client information, comprising the correspondence relationship information of terminal AID and Correspondent Node AID;

Described P-GW cut out control module be used for by the signaling interface between P-GW or by the signaling of transmitting between former S-GW, former MMN, target MMN, target S-GW will preserve cut out terminal client information is sent to target P-GW;

The incision control module of described P-GW also be used for receive incision terminal that former P-GW transmits to client information with after for the new RID of this incision terminal distribution, activate the RID update module among this P-GW;

RID update module among the described P-GW is used for inquiring about the RID that obtains described Correspondent Node in this locality or to ILR according to the AID to the client information Correspondent Node of this terminal, the gateway that inserts to described Correspondent Node sends the RID update notification, carries AID and this new RID of this terminal.

Described MMN also comprises opposite end maintenance of information module and RID update module; Wherein:

What the opposite end maintenance of information module among the described MMN was used to preserve terminal safeguards this to client information to client information and according to the update notification of P-GW, comprising the correspondence relationship information of terminal AID and Correspondent Node AID;

Among the described MMN cut out control module also be used for by change before the reorientation finish that acknowledge message will preserve cut out terminal client information is sent to target MMN;

Incision control module among the described MMN also is used at the new RID that receives the incision terminal that target P-GW sends, and with former MMN that transmit with this incision terminal local maintenance client information is merged after, activate the RID update module among this MMN;

RID update module among the described MMN is used for the AID to the client information Correspondent Node according to the incision terminal, inquire the address information of the MMN of Correspondent Node access, the MMN that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

The control module that cuts out of described P-GW also was used for before the forwarding tunnel between this P-GW and target P-GW is set up, the data message of receiving that cuts out terminal of issuing is separated RID encapsulation and inspection, send out opposite end information updating notice to former MMN, carry this that need to upgrade cut out terminal to client information; After this transmits tunnel foundation, directly be transmitted to target P-GW with issuing this data message that cuts out terminal;

The incision control module of described P-GW also is used for after forwarding tunnel between this P-GW and former P-GW sets up, the data message of issuing the incision terminal is separated RID encapsulation and inspection, send opposite end information updating notice to target MMN, carry need this incision terminal of upgrading to client information.

The packet forwarding module of described P-GW is before the forwarding tunnel between this P-GW and target P-GW is set up, the data message of receiving that cuts out terminal of issuing is separated RID encapsulation and inspection, be transmitted to target P-GW again, and will need to upgrade this cut out terminal notify the opposite end maintenance of information module of this P-GW to client information, after this transmits tunnel foundation, directly be transmitted to target P-GW with issuing this data message that cuts out terminal; And, after forwarding tunnel between this P-GW and former P-GW is set up, the data message of issuing the incision terminal is separated RID encapsulation and is checked, be forwarded to target S-GW, and will need this incision terminal of upgrading notify the opposite end maintenance of information module of this P-GW to client information;

Opposite end maintenance of information module among the described P-GW also be used for receive incision terminal that former P-GW sends to client information after, with this incision terminal of preserving with this locality of receiving to the client information merging, and client information is safeguarded after being combined.

Described P-GW cut out control module by the signaling interface between P-GW will preserve cut out terminal client information is sent to target P-GW, and notify the packet forwarding module of this P-GW; And receive incision terminal that former P-GW transmits to preserving behind the client information, and notify the packet forwarding module of this P-GW;

The packet forwarding module of described P-GW described client information is transmitted before, the data message of receiving that cuts out terminal of issuing is separated the RID encapsulation and is checked, what this that needs are upgraded cut out terminal notifies the opposite end maintenance of information module of this P-GW to client information; Described client information is transmitted after, this data message that cuts out terminal of issuing of receiving directly is transmitted to this target P-GW; And, receive incision terminal that former P-GW transmits to client information after, the data message of issuing this incision terminal is separated the RID encapsulation and is checked, notify the opposite end maintenance of information module of this P-GW with what this of needs renewal cut out terminal to client information.

The packet forwarding module of described P-GW is given target P-GW with the data message forwarding of receiving that cuts out terminal of issuing after the forwarding tunnel between this P-GW and the target P-GW is set up; And, after receiving the data message of issuing the incision terminal, be transmitted to target S-GW;

Described S-GW receives advanced row cache behind the data message of issuing the incision terminal that target P-GW transmits, after asking the carrying of foundation and Target Wireless side network element, again the data in buffer message is sent to this incision terminal through this Target Wireless side network element according to the modification carrying of target MMN.

The incision control module of described MMN is before forwarding tunnel between target P-GW and the former P-GW is set up in control, and mutual by with Target Wireless side network element and target S-GW is for the incision terminal is set up carrying between this Target Wireless side network element and this target S-GW;

Described S-GW is transmitted to Target Wireless side network element after receiving the data message of issuing the incision terminal that target P-GW transmits;

Described Target Wireless side network element is advanced row cache after receiving the data message of issuing the incision terminal, after this incision terminal switches to this Target Wireless side network element, the data in buffer message is sent to this terminal.

The packet forwarding module of described P-GW is after receiving the data message that cuts out the terminal transmission, this data message is carried out RID encapsulation and inspection, this data message forwarding is arrived packet data network, and send update notification to the opposite end of this P-GW or former MMN maintenance of information module, carry this that need to upgrade cut out terminal to client information; Perhaps

The packet forwarding module of described P-GW is after receiving the data message that cuts out the terminal transmission, directly with this data message forwarding to target P-GW, and, behind the data message of receiving the incision terminal transmission that former P-GW sends, carry out RID encapsulation and inspection, this data message forwarding is arrived packet data network, and send update notification to the opposite end maintenance of information module of this P-GW or target MMN, carry need this incision terminal of upgrading to client information.

Described target MMN or target S-GW determine target P-GW according to zone, terminal position and/or network configuration information, perhaps

Target MMN or target S-GW determine target P-GW according to the indication of terminal or wireless side network element.

Incision control module among the described P-GW for the incision terminal distribution behind the new RID, also will this new RID and this incision terminal client information is sent to target MME through target S-GW;

Described MME also comprises the RID update module; The incision control module of described MME receive the incision terminal to client information after, activate the RID update module of this MME; The RID update module of described MME is used for the AID to the client information Correspondent Node according to the incision terminal, inquire the address information of the MME of Correspondent Node access, the MME that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

The mode that the present invention adopts identify label to separate with station location marker realizes the mobility of unanchored mode in the wireless communication system, thereby solved the variety of problems that can only adopt fixed anchor point mechanism to be brought in the existing communication network, avoided the circuitous phenomenon of mobile back data, reduce transmission delay and bandwidth waste, improved the travelling performance of terminal in wireless communication system effectively.

Description of drawings

Description of drawings is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 a is a cordless communication network connection diagram in the prior art;

Fig. 1 b is that cordless communication network is striden S-GW switching schematic diagram in the prior art;

Fig. 1 c is the switching flow figure that terminal adopts the fixed anchor point mode in the prior art;

Fig. 1 d is the network topology schematic diagram of embodiment of the invention SILSN framework;

Fig. 2 is the connection diagram that the present invention adopts first kind of EPS network of SILSN framework;

Fig. 3 is the connection diagram that the present invention adopts second kind of EPS network of SILSN framework;

Fig. 4 is the connection diagram that the present invention adopts the third EPS network of SILSN framework;

Fig. 5 is switching flow figure one provided by the invention, and the handoff procedure of a kind of P-GW of striding is shown;

Fig. 5 a is switching flow figure two provided by the invention, and the handoff procedure of a kind of P-GW when constant is shown;

Fig. 6 is switching flow figure three provided by the invention, and the handoff procedure that another kind is striden P-GW is shown;

Fig. 7 is switching flow figure four provided by the invention, and the handoff procedure that another kind is striden P-GW is shown;

Fig. 8 is switching flow figure five provided by the invention, and the handoff procedure that another kind is striden P-GW is shown;

Fig. 9 is switching flow figure six provided by the invention, and the handoff procedure that another kind is striden P-GW is shown;

Figure 10 is switching flow figure seven provided by the invention, and the handoff procedure of another kind of P-GW when constant is shown.

Figure 11 is the module map that the invention provides corresponding to P-GW in the EPS network of Fig. 4.

Embodiment

Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail, can implement according to this so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.

The present invention in chain of command and the network that the medium face separates, realizes above-mentioned SILSN framework applications not have fixed anchor point and switches.SILSN framework and operation principle thereof according to the background technology record can be understood, and when terminal moved the switching of striding ASN, the target ASN that cuts a side will be terminal distribution RID, initiate registration to this terminal attaching ILR; The source ASN that cuts out a side will delete the AID-RID map information of this terminal, and safeguards the AID-RID map information of these all Correspondent Nodes of terminal.For the message that makes Correspondent Node send to this terminal can be routed to target ASN rapidly, can send the RID update notification to the gateway that Correspondent Node inserts.Source ASN can also transmit the AID-RID map information to client information and/or all Correspondent Nodes of this terminal to target ASN.In addition, in handoff procedure, source ASN need transmit the message that Correspondent Node sends to this terminal to target ASN.

Based on the EPS network, propose three kinds of EPS networks that adopt the SILSN framework below, be primarily aimed to realizing that terminal identity identifies the improvement of carrying out that separates needs with the position and is described on original system.In the network element such as P-GW, MME of needs upgrading, remove the identify label of hereinafter mentioning and separate relevant functional module with the position with realizing terminal, need be retained in original other functional modules of EPS system, hereinafter just explanation no longer one by one.

In the literary composition, the network element that Correspondent Node is inserted abbreviates the opposite end network element as.

The network architecture one

The framework of first kind of EPS network with SILSN framework has provided main network element in this architecture network and the connecting interface between each network element as shown in Figure 2 among the figure.

The Access Network part of SILSN framework mainly realizes that by the wireless access network in the EPS network P-GW after the MME in the EPS network, S-GW and the upgrading realizes the function that ASN will finish jointly.Simultaneously, increased the ILR that has with the interface of P-GW, network elements such as PTF, these network elements are logical ne, can close with existing elements on physical entity and establish.The support RID route that P-GW is connected to, the packet data network (PDN) of forwarding constitute the broad sense Forwarding plane.Have signaling interface between P-GW and the ILR, do not have signaling interface between MME and the ILR, with AID, the processing that RID is relevant mainly realizes in P-GW.

Wherein:

P-GW is used to terminal that access service is provided, be terminal distribution RID, RID to ILR registration (being also referred to as registration) and cancellation (being also referred to as cancellation registers) terminal, RID to ILR query communication opposite end, maintenance terminal to client information, the AID-RID map information of maintenance terminal and Correspondent Node thereof sends the RID update notification to the opposite end gateway, the data message is carried out the RID encapsulation, separates RID encapsulation and forwarding, and cooperate the realization terminal to stride the switching of P-GW with other network elements.The RID that P-GW distributes points to this P-GW, can be the IP address of P-GW as RID.AID is a terminal distribution in the time of then can contracting on home subscriber server, as being IPV6/IPV4 address or IMSI or temporary mark or NAI.Other frameworks also herewith.

Under this framework, but terminal the maintenance of client information also MME is finished perhaps finished jointly by P-GW and MME.Correspondingly, also can finish to the function of opposite end gateway transmission RID update notification by MME.

The function of ILR, the PTF of mapping Forwarding plane is as indicated above.

The network architecture two

The framework of second kind of EPS network with SILSN framework has provided main network element of this architecture network and the connecting interface between each network element as shown in Figure 3 among the figure.The Access Network part of SILSN framework is mainly realized by the wireless access network in the EPS system, the S-GW in the EPS system, and P-GW after the upgrading and MME realize the function that ASN will finish jointly.Simultaneously, increased and P-GW between have the ILR of interface, network elements such as PTF.These network elements are logical ne, can close with existing elements on physical entity and establish, and the support RID route that P-GW is connected to, the packet data network (PDN) of forwarding constitute the broad sense Forwarding plane.All there is signaling interface between ILR and the P-GW and between ILR and the MME.Partial function changes by MME to be finished.

Wherein:

P-GW, be used to terminal distribution RID, the RID to ILR query communication opposite end, the AID-RID map information of maintenance terminal and Correspondent Node thereof, the data message is carried out the RID encapsulation, separates RID encapsulation and forwarding, and cooperate the realization terminal to stride the switching of P-GW with other network elements.

MME is used for the RID of ILR registration and unregistration terminal, cooperates with other network elements to realize that terminal strides the switching of P-GW.

But terminal to the maintenance of client information also MME, or P-GW and MME finish jointly.The function that sends the RID update notification to the opposite end gateway can be finished by MME or P-GW.

The function of ILR, the PTF of mapping Forwarding plane is as indicated above.

The network architecture three

The framework of second kind of EPS network with SILSN framework has provided main network element of this architecture network and the connecting interface between each network element as shown in Figure 4 among the figure.In this framework, there is not signaling interface between P-GW and the ILR, has signaling interface between MME and the ILR.

The Access Network part of SILSN framework is realized by the wireless access network in the EPS system that mainly P-GW, MME after S-GW in the EPS system and the upgrading realize the function that ASN will finish jointly.Simultaneously, increased and P-GW between have the network elements such as PTF of interface, and and MME between have the ILR of signaling interface.These network elements are logical ne, can close with existing elements on physical entity and establish, and the support RID route that P-GW is connected to, the PDN of forwarding constitute the broad sense Forwarding plane.Owing to do not have interface between ILR and the P-GW, compare with framework two, P-GW need be by the RID of MME to ILR query communication opposite end, and MME need increase according to the request of P-GW to ILR query communication opposite end RID and return the function of Query Result.Other functions of P-GW and MME no longer repeat with framework two.

The function of ILR, the PTF of mapping Forwarding plane is as indicated above.

The above network architecture all is to carry out illustratedly with the non-roaming situation of terminal, and under the situation that terminal is roamed, P-GW or S-GW need be mutual with the ILR/PTF on terminal attaching ground by the ILR/PTF on visit ground, and hereinafter terminal switching flow is not had to influence.

To be further described based on the handoff procedure of the above-mentioned network architecture to terminal below, former meaningful to original message in the handoff procedure no longer describes in detail.

Fig. 5 shows on the basis of the network architecture shown in Figure 2, terminal is striden the flow process that P-GW switches, be determined to the target P-GW that is different from former P-GW, two P-GW set up the data forwarding passage alternately by the signaling interface between P-GW, and the concrete steps of this flow process are as follows:

Step 501, wireless side network element judge that needing to send S1 switches;

Step 502, former wireless side network element sends handoff request to former MME;

Step 503, former MME changes request message before the reorientation that sends to target MME, with the AID of former P-GW address and terminal;

Step 504, target MME sends session to target S-GW and sets up request, and the AID of tape terminal, former P-GW address and definite target P-GW address do not need the Tunnel Identifier that distributes with former P-GW.Target S-GW sends session to this target P-GW and sets up request, the AID of tape terminal and former P-GW address;

Target S-GW sends the session request of setting up to this target P-GW and goes back the tunnel information of portability for the tunnel distributing between foundation and the target P-GW.

Among each embodiment, target MME can be according to local policy (as zone, terminal position and/or network configuration information, the band of position is as being LAI, RAI, TAI or wireless side NE ID etc.) determine also can determine target P-GW by target P-GW according to the indication of terminal or wireless side network element.As in one example, can be according to the band of position of terminal, this terminal of chosen distance nearest and be the GGSN that belongs to same APN.In another embodiment, also can determine target P-GW and notification target MME by target S-GW.

Step 505, target P-GW is the new RID of terminal distribution and preserves this terminal AID and the map information of this new RID;

Step 506, target P-GW are initiated the RID registration, and the RID of this terminal that this terminal attaching ILR is preserved is updated to new RID;

When the target side network element is initiated the RID registration, send the RID register requirement to terminal attaching ILR, carry this terminal AID and new RID, the RID in this terminal AID-RID map information that will preserve after this ILR receives is updated to this new RID, has also promptly upgraded the AID-RID map information of this terminal.

Flow process is set up in the register flow path in this step and the tunnel of step 507 does not have inevitable sequencing.

Step 507, target P-GW sends to former P-GW and transmits tunnel foundation request, and the tunnel is transmitted in the uplink and downlink that request is set up between former P-GW and target P-GW, carries to setting up the tunnel information that tunnel distributing is transmitted in these uplink and downlink;

Step 508, former P-GW replys target P-GW and transmits the tunnel and set up response, carry this terminal to client information, alternatively, also carry the AID-RID map information of this terminal;

Step 509, target P-GW finds gateway (the abbreviation opposite end gateway that Correspondent Node inserts according to the AID to Correspondent Node in the client information of this terminal, as P-GW, also may be other gateways such as ISN), send the RID update notification to the opposite end gateway, carry the AID of this terminal and new RID;

After the opposite end gateway is received, the RID in the AID-RID map information of this terminal can be updated to this new RID.

After this step, data flow is as follows:

The flow direction of the downlink data message of issuing this terminal that former P-GW receives is: former P-GW-＞target P-GW-＞target S-GW, data will be buffered among the target S-GW.

After this step, more the opposite end P-GW of new terminal RID can directly send to target P-GW with the data that mail to terminal, and the downlink data of issuing this terminal that target P-GW receives flows to and is: target P-GW-＞target S-GW, data will be buffered among the target S-GW.

The uplink data messages that terminal sends flows to: terminal-＞former wireless side network element-＞former S-GW-＞former P-GW-＞target P-GW, when Correspondent Node was linked into another P-GW, target P-GW was forwarded to packet data network again.

Step 510, target P-GW replys session to target S-GW and sets up response message, carries the tunnel information into tunnel distributing between foundation and the target S-GW, and target S-GW replys session to target MME and sets up response message;

P-GW receives the session request of setting up, for this terminal distribution and target S-GW between just can set up response message behind the tunnel information in tunnel to target S-GW answer session, do not have necessary sequencing with step 505 to 509.

Step 511, target MME request target wireless side network element are carried out and are switched;

Step 512, Target Wireless side network element is responded switching request acknowledgement message to target MME, does not need to carry the forwarding tunnel information;

Step 513, target MME changes response message before former MME sends reorientation;

Step 514, former MME sends switching command to former wireless side network element;

Step 515, former wireless side network element sends switching command to terminal;

Step 516, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 517, Target Wireless side network element notification target MME switches;

Step 518, notification message is finished in target MME commentaries on classics before former MME sends reorientation;

Step 519, acknowledge message is finished in former MME commentaries on classics before target MME replys reorientation;

Step 520, target MME request target S-GW revises beared information, and target S-GW does not send to P-GW and revises bearing request message;

Step 521, target S-GW responds the bearing modification result to target MME;

Step 522 is carried out former BlueDrama deletion and is transmitted tunnel release flow process, and this flow process can be triggered by timer by former P-GW.

In the above-mentioned flow process, target S-GW finds it is the switching of striding P-GW in step 504, then need the downlink data of the follow-up arrival of buffer memory, just downlink data is mail to terminal up to step 520.

After switching was finished, the forward-path of uplink data messages was: terminal-＞Target Wireless side network element-＞target S-GW-＞target P-GW, target P-GW carries out the RID encapsulation to message and transmits, and is routed to the opposite end gateway through PDN.The forward-path of downlink data message is: target P-GW-＞target S-GW-＞Target Wireless side network element-＞terminal, target P-GW separates the RID encapsulation to message.Therefore realize the switching of no fixed anchor point, avoided route circuitous.Other target P-GW embodiment forward-path switching after different with source P-GW all herewith.

In the above-mentioned flow process, after forwarding tunnel between former P-GW and target P-GW was set up, former P-GW and target P-GW be to maintenance and transmission to client information, and can be in the following ways to the respective handling of data message:

Mode one, the same time only by a P-GW maintenance terminal to client information.

Former P-GW by transmit the tunnel to target P-GW transmit terminal to client information before, by former P-GW downlink data message is separated the RID encapsulation and check after be forwarded to target P-GW again, former P-GW continue to safeguard preserve this to client information.Former P-GW to target P-GW transmit terminal to client information after, directly be forwarded to target P-GW after receiving downlink data message, no longer carry out decapsulation and inspection; Target P-GW receives this to before the client information, directly the downlink data message of receiving is forwarded to target S-GW, receives this to after the client information, also will separate RID encapsulation and inspection to this downlink data message, preserves, safeguards that this is to client information.

Maintenance is during to client information, as checking by real-time stream testing mechanism or to AID in the data message, add the AID of the new Correspondent Node found to this in the client information, detect or the opposite end notice is known when the Correspondent Node off-line is arranged by real-time stream, deletion is to the AID of this Correspondent Node in the client information, and each network element is similar to the maintenance mode to client information.

Correspondingly, former P-GW with this to client information before target P-GW transmits, the flow direction of the data message that this terminal sends is: this terminal-＞former wireless side network element-＞former S-GW-＞former P-GW, former P-GW carries out the RID encapsulation to this data message and checks, with safeguard this terminal to client information; This former P-GW transmit described to after the client information and this terminal switch to before the Target Wireless side network element, the flow direction of the data message that this terminal sends be this terminal-＞former wireless side network element-＞former S-GW-＞former P-GW-＞target P-GW, target P-GW carries out RID encapsulation to this data message and checks, safeguard this terminal to client information.

Mode two is safeguarded client information by former side and target side P-GW in certain period simultaneously.

After transmitting tunnel foundation, former P-GW directly is forwarded to target P-GW after receiving downlink data message, continue simultaneously to safeguard this terminal to client information, target P-GW the downlink data message of receiving is separated the RID encapsulation and check after transmit again, preserve in this locality, safeguard this terminal to client information.This stage be by former P-GW and target P-GW safeguard simultaneously this terminal to client information.Target P GW receive this terminal that former P-GW transmits to behind the client information, this terminal of preserving with this locality of receiving merged client information is safeguarded after being combined afterwards to client information.

Correspondingly, before this terminal switches to Target Wireless side network element, the flow direction of the uplink data messages that this terminal sends is: this terminal-＞former wireless side network element-＞former S-GW-＞former P-GW, former P-GW carries out RID encapsulation to this data message and checks, that safeguards this terminal of preserving notifies former MME to what client information maybe will need this terminal of upgrading to client information.At this moment, only need set up this former P-GW to the descending forwarding tunnel between target P-GW.Each flow process in the literary composition all herewith.

Under the above variety of way, P-GW maintenance terminal to client information the time, the AID-RID map information of the Correspondent Node of maintenance terminal as preserving the AID-RID map information of the Correspondent Node of also not preserving in the data message, is preserved the AID-RID map information of the Correspondent Node that inquires etc. simultaneously.

Correspondingly, present embodiment based on communication system in, S-GW is used to the incision terminal to set up tunnel between S-GW and target P-GW and S-GW and Target Wireless side network element, carries out data message forwarding, reaches mutual information between transmission MME and the P-GW.And the MME functional module relevant with switching with P-GW is as follows:

MME comprises:

Cut out control module, be used for after S1 switch to initiate, request target MME reorientation, and will cut out the AID of terminal and the address information of former P-GW is sent to target MME; Notify this to cut out terminal by former wireless side network element and carry out switching, and after switching is finished, carry out former BlueDrama deletion and forwarding tunnel and discharge flow process.

The incision control module, be used for after receiving re-positioning request, determining target S-GW and target P-GW, when having determined target S-GW different and the target P different-GW, the AID and the former P-GW address information of incision terminal is sent to this target P-GW through target S-GW with former P-GW with former S-GW; And mutual with Target Wireless side network element and target S-GW, be incision terminal foundation tunnel between the two.

As shown in figure 11, P-GW comprises:

Cut out control module, be used for by the signaling interface between P-GW will preserve cut out terminal client information is sent to target P-GW.

The incision control module, be used for behind the AID and former P-GW address information that receive the incision terminal that target MME transmits, point to the new RID of this P-GW for this terminal distribution, preserve the map information of this terminal AID and this new RID, activate the RID Registering modules, module is set up in first tunnel and module is set up in second tunnel, receive incision terminal that former P-GW transmits to client information after activate RID update module among this P-GW again, and packet forwarding module is controlled.

Packet forwarding module is used for the data message of cutting, cut out terminal is carried out the RID encapsulation, separates the RID encapsulation and transmits processing; After the forwarding tunnel between this P-GW and the target P-GW is set up, give target P-GW with the data message forwarding of receiving that cuts out terminal of issuing; After receiving the data message of issuing the incision terminal, be transmitted to target S-GW.

Module is set up in first tunnel, is used to the forwarding tunnel between foundation of incision terminal and target S-GW.

Module is set up in second tunnel, is used for sending the forwarding tunnel by the signaling interface between P-GW to former P-GW and sets up request, carries this P-GW for transmitting the tunnel information of tunnel distributing between foundation of incision terminal and former P-GW; And, receive that target P-GW sends for cut out terminal set up transmit the tunnel and set up request after, reply to target P-GW and to transmit the tunnel and set up and respond.

The RID Registering modules is used for sending register requirement to incision terminal attaching ILR, carries the AID of this incision terminal and new RID.

Opposite end maintenance of information module, be used to preserve with maintenance terminal to client information, comprising the correspondence relationship information of terminal AID and Correspondent Node AID.

The RID update module is used for inquiring about the RID that obtains Correspondent Node according to the AID to the client information Correspondent Node of this terminal in this locality or to ILR, and the gateway that inserts to Correspondent Node sends the RID update notification, carries AID and this new RID of this terminal.

In maintenance and the transmission to client information, the respective handling that reaches the data message adopts mode for the moment, has:

P-GW cut out control module by the signaling interface between P-GW will preserve cut out terminal client information is sent to target P-GW, and notify the packet forwarding module of this P-GW; And receive incision terminal that former P-GW transmits to preserving behind the client information, and notify the packet forwarding module of this P-GW;

The packet forwarding module of P-GW is at down direction, before client information is transmitted, the data message of receiving that cuts out terminal of issuing is separated RID encapsulation and checked, what this that needs are upgraded cut out terminal notifies the opposite end maintenance of information module of this P-GW to client information; After client information is transmitted, this data message that cuts out terminal of issuing of receiving directly is transmitted to this target P-GW; And, receive incision terminal that former P-GW transmits to client information after, the data message of issuing this incision terminal is separated the RID encapsulation and is checked, notify the opposite end maintenance of information module of this P-GW with what this of needs renewal cut out terminal to client information.At up direction, after receiving the data message that cuts out the terminal transmission, directly with this data message forwarding to target P-GW, and, behind the data message of receiving the incision terminal transmission that former P-GW sends, carry out RID encapsulation and inspection, this data message forwarding to packet data network, and is sent update notification to the opposite end of this P-GW maintenance of information module, carry need this incision terminal of upgrading to client information.

In maintenance and transmission, and when the respective handling of data message adopted mode two, have client information:

The packet forwarding module of P-GW is at down direction, before the forwarding tunnel between this P-GW and target P-GW is set up, the data message of receiving that cuts out terminal of issuing is separated RID encapsulation and inspection, be transmitted to target P-GW again, and will need to upgrade this cut out terminal notify the opposite end maintenance of information module of this P-GW to client information, after this transmits tunnel foundation, directly be transmitted to target P-GW with issuing this data message that cuts out terminal; And, after forwarding tunnel between this P-GW and former P-GW is set up, the data message of issuing the incision terminal is separated RID encapsulation and is checked, be forwarded to target S-GW, and will need this incision terminal of upgrading notify the opposite end maintenance of information module of this P-GW to client information.At up direction, after receiving the data message that cuts out the terminal transmission, this data message is carried out RID encapsulation and inspection, this data message forwarding is arrived packet data network, and send update notification to the opposite end of this P-GW or former MME maintenance of information module, carry this that need to upgrade cut out terminal to client information.

Opposite end maintenance of information module among the P-GW also be used for receive incision terminal that former P-GW sends to client information after, with this incision terminal of preserving with this locality of receiving to the client information merging, and client information is safeguarded after being combined.

The correlating event that need know when above-mentioned packet forwarding module E-Packets such as tunnel set up, transmit the tunnel set up, to the transmission of client information, to the reception of client information etc., by the incision control module or cut out control module and notify.

After if terminal moves, P-GW remains unchanged.The flow process of this scene correspondence is shown in Fig. 5 a, compare with Fig. 5, no longer set up the data forwarding passage between the P-GW, target P-GW need not to be the new RID of terminal distribution, need not to proceed to the RID registration of ILR and to the RID of opposite end new technological process more, and this P-GW need preserve the tunnel information of former S-GW and target S-GW simultaneously.Other handle with the flow process of above-mentioned Fig. 5 similar, comprising:

Step 5a01, wireless side network element judge that needing to send S1 switches.

Step 5a02, former wireless side network element sends handoff request to former MME.

Step 5a03, former MME changes request message before the reorientation that target MME sends, carry the Tunnel Identifier of P-GW address and distribution thereof;

Step 5a04, target MME sends session to target S-GW and sets up request, the Tunnel Identifier that band P-GW address and this P-GW distribute; Target S-GW sends session to P-GW and sets up request, carries the tunnel information of S-GW for the tunnel distributing between foundation and P-GW, and P-GW preserves the tunnel information of former S-GW and target S-GW simultaneously;

In this step, target P-GW is former P-GW, just is called P-GW in this flow process.Target MME to the session that target S-GW sends set up Tunnel Identifier that the P-GW that carries in the request distributes can be set up for this terminal with target S-GW between the new Tunnel Identifier of tunnel distributing, be the Tunnel Identifier of the tunnel distributing between this terminal foundation and former S-GW before also can being.

At this moment, data flow is described below:

Downlink data flows to: P-GW-＞target S-GW, data will be buffered among the target S-GW.

Upstream data flows to: terminal-＞former wireless side network element-＞former S-GW-＞P-GW.

Step 5a10, P-GW replys session to target S-GW and sets up response message, and target S-GW replys session to target MME and sets up response message.

Step 5a11, target MME request target wireless side network element carry out and switch.

Step 5a12, Target Wireless side network element is responded switching request acknowledgement message to target MME, does not need to carry the forwarding tunnel information.

Step 5a13, target MME changes response message before former MME sends reorientation.

Step 5a14, former MME sends switching command to former wireless side network element.

Step 5a15, former wireless side network element sends switching command to terminal.

Step 5a16, terminal sends switch acknowledgment message to Target Wireless side network element.

Step 5a17, Target Wireless side network element notification target MME switches.

Notification message is finished in step 5a18, Target Wireless side network element commentaries on classics before former MME sends reorientation.

Acknowledge message is finished in step 5a19, former MME commentaries on classics before target MME replys reorientation.

Step 5a20, target MME request target S-GW revises beared information, and target S-GW does not send to P-GW and revises bearing request message.

Step 5a21, target S-GW responds the bearing modification result to target MME.

Step 5a22 carries out former BlueDrama deletion and transmits tunnel release flow process, and this flow process can be triggered by timer by former P-GW.

Above-mentioned flow chart 5a adopt P-GW preserve terminal to client information, need not to carry out transmission to client information.If by MME preserve terminal to client information, former MME need give target MME with the opposite end information band of this terminal at step 5a19, and in handoff procedure, P-GW is before the data channel of foundation and target MME, to the data message encapsulate, decapsulation and inspection (also can flow real-time detection), this terminal that needs are upgraded client information is notified to former MME, after the data channel of foundation and target MME, what then will need this terminal of upgrading is notified to target MME to client information, target MME preserve in this locality and safeguard this terminal to client information; Target MME receive that former MME sends to behind the client information, with this terminal of preserving with this locality of sending client information is merged, continue to safeguard after merging to client information.

This flow process also is suitable for Fig. 3, the network architecture shown in Figure 4.

Fig. 5 a flow process is compared with existing procedure, tunnel between P-GW and the target S-GW is received at target S-GW and is just begun after request is set up in session to set up, in handoff procedure, the downlink data of terminal directly sends to target S-GW by P-GW, and the tunnel that need not between the S-GW is transmitted.

Fig. 6 shows on the basis of the Fig. 3 or the network architecture shown in Figure 4 two, and terminal is striden the flow process of P-GW handoff procedure.In this flow process, target P-GW is different with former P-GW, sets up the data forwarding passage by the interface between P-GW, initiates the RID registration by MME.Concrete steps are described below:

Step 601-605 is with step 501-505;

Step 606, target P-GW sends to former P-GW and transmits tunnel foundation request, and request is set up the uplink and downlink of this terminal between former P-GW and target P-GW and is transmitted the tunnel, carries corresponding tunnel information;

Step 607, former P-GW replys target P-GW and transmits the tunnel and set up response, carry this terminal to client information, alternatively, go back the AID-RID map information of carried terminal;

At this moment, data flow is described below:

The downlink data message of issuing terminal that former P-GW receives flows to and is: former P-GW-＞target P-GW-＞target S-GW, data will be buffered among the target S-GW.

The flow direction of the uplink data messages that terminal sends is: terminal-＞former wireless side network element-＞former S-GW-＞former P-GW.

Step 608, target P-GW replys session to target S-GW and sets up response message, carry the new RID of this terminal and this terminal to client information; Target S-GW replys session to target MME and sets up response message, carry the new RID of this terminal and this terminal to client information;

Step 609, target MME initiates the RID registration, and the RID of this terminal that this terminal attaching ILR is preserved is updated to new RID;

Step 610, target MME request target wireless side network element are carried out and are switched;

This step carries out in step 608 back, does not have inevitable precedence relationship with step 609.

Step 611, target MME to opposite end MME transmission RID update notification, carries the AID of this terminal and new RID according to the address information that the AID to Correspondent Node in the client information of this terminal finds opposite end MME;

Target MME can be according to the AID of Correspondent Node, from the server of this locality configuration or Correspondent Node ownership (as HSS, ILR) or dns server inquire the address information of opposite end MME.After receiving, opposite end MME needs the AID and the new RID of this terminal in this RID update notification are passed to the opposite end gateway, after the opposite end gateway is received, RID in the AID-RID map information of this terminal of preserving is updated to this new RID, also is equivalent to upgrade the AID-RID map information of this terminal.

At this moment, the Correspondent Node that target P-GW the receives downlink data message of issuing terminal flows to and to be: target P-GW-＞target S-GW, data will be buffered among the target S-GW, just mail to terminal up to step 620.

This step carries out in step 608 back, and with step 609,610 do not have inevitable precedence relationship.

Step 612, Target Wireless side network element is responded switching request acknowledgement message to target MME, does not need to carry the forwarding tunnel information;

Step 613-622 is with step 513-522.

Above-mentioned flow process can have one to become example, i.e. the RID that sends to the opposite end by target P-GW rather than target MME new technological process more at this moment, after step 607, can be carried out:

Step 607a, target P-GW is according to the AID to Correspondent Node in the client information of this terminal, after this locality is searched or is found the RID of Correspondent Node to ILR, send the RID update notification to opposite end P-GW (also may be other gateways such as ISN), carry the AID of this terminal and new RID.

Correspondingly, need not to carry out the step 611 in the above-mentioned flow process, and set up response message to the session that target S-GW replys at target P-GW, and the target S-GW session of replying to target MME set up need not in the response message to carry this terminal to client information.

Above-mentioned flow process be by P-GW preserve and maintenance terminal to client information, in handoff procedure, can adopt aforesaid way one or mode two safeguard to client information with carry out the processing of data message.During employing mode two, only need set up the descending forwarding tunnel of former P-GW to target P-GW.

P-GW that the P-GW of the above-mentioned flow process correspondence functional module relevant with switching with MME and Fig. 5 flow process are corresponding and the functional module of MME are basic identical, and difference is the function that the RID registration is relevant with the RID renewal, and these two functions are finished by MME in the above-mentioned flow process.Particularly:

P-GW does not have RID Registering modules and RID update module;

Incision control module among the P-GW for the incision terminal distribution behind the new RID, also will this new RID and this incision terminal of receiving client information is sent to target MME through target S-GW.

The incision control module of MME receive this new RID and this incision terminal to client information after, activate RID Registering modules and the RID update module of this MME;

The RID Registering modules of MME is used for behind the new RID that receives the incision terminal, and ILR sends register requirement to the incision terminal attaching, carries the AID of this incision terminal and new RID;

The RID update module of MME, be used for AID to the client information Correspondent Node according to the incision terminal, inquire the address information of the MME that Correspondent Node inserts, the MME that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

Fig. 7 shows on the basis of the network architecture shown in Figure 2, and terminal is striden the flow process of P-GW handoff procedure.Do not have signaling interface between the P-GW, set up data forwarding passage between former P-GW and the target P-GW by MME, metadata cache is at S-GW.Concrete steps are described below:

Step 701-706 is with step 501-506;

Step 707, target P-GW replys session to target S-GW and sets up response message, and target S-GW replys session to target MME and sets up response message;

Step 708, target MME request target wireless side network element are carried out and are switched;

Step 709, Target Wireless side network element is responded switching request acknowledgement message to target MME, does not need to carry the forwarding tunnel information;

Step 710, target MME sends the forwarding tunnel to target S-GW and sets up request, and target S-GW sends to target P-GW and transmits tunnel foundation request, and the descending forwarding tunnel between former P-GW and target P-GW is set up in request, after target P-GW receives, for this descending forwarding tunnel distributing is transmitted Tunnel Identifier;

Step 711, target P-GW replys target S-GW forwarding tunnel and sets up response, carries described forwarding Tunnel Identifier, and target S-GW replys target MME and transmits tunnel foundation response, carries described forwarding Tunnel Identifier;

In another embodiment, can set up request message by the session of step 704 comes the forwarding tunnel in the forwarding step 710 to set up request, correspondingly, the message content of forwarding tunnel in the step 711 being set up response is set up in the response message as the session of transmitting Tunnel Identifier and being placed on step 707 and is transmitted, but this moment cancellation step 710 and 711.

Step 712, target MME changes response message before former MME sends reorientation;

Step 713, former MME sends the forwarding tunnel to former S-GW and sets up request, and former S-GW sends to former P-GW and transmits tunnel foundation request, and the descending forwarding tunnel between former P-GW and target P-GW is set up in request, carries the described forwarding Tunnel Identifier that target P-GW distributes;

This flow process also can be set up forwarded upstream tunnel between former P-GW and target P-GW for this terminal, and target P-GW is that this forwarded upstream tunnel distributing is transmitted Tunnel Identifier, and is sent to former P-GW.

Step 714, former P-GW replys former S-GW and transmits tunnel foundation response, former S-GW replys former MME and transmits tunnel foundation response, carry this terminal to client information, the AID-RID map information of all right all Correspondent Nodes of carried terminal, former MME buffer memory receive to client information, or to client information and AID-RID map information;

At this moment, data flow is as follows:

The downlink data message of issuing terminal that target P-GW receives flows to and is: target P-GW-＞target S-GW, data will be buffered among the target S-GW.

The flow direction of the uplink data messages that terminal sends is: terminal-＞former wireless side network element-＞former S-GW-＞former P-GW, also be fine through target P-GW forwarding again by former P-GW.

Step 715, former MME sends switching command to former wireless side network element;

Step 716, former wireless side network element sends switching command to terminal;

Step 717, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 718, Target Wireless side network element notification target MME switches;

Step 719, notification message is finished in target MME commentaries on classics before former MME sends reorientation;

Step 720, former MME changes before target MME replys reorientation and finishes acknowledge message, carry this terminal to client information, go back the AID-RID map information of these all Correspondent Nodes of terminal of portability;

Step 721, target MME sends to target S-GW and revises bearing request message, target S-GW sends to P-GW and revises bearing request message, all carry this terminal to client information, alternatively, revise the AID-RID map information that also carries these all Correspondent Nodes of terminal in the bearing request message at these two;

Step 722, target P-GW according to this terminal to client information, after this locality is searched or found the RID of opposite end to ILR, send the RID update notification to the opposite end gateway, carry the AID of this terminal and new RID;

Step 723, target P-GW responds the bearing modification result to target S-GW, and target S-GW responds the bearing modification result to target MME;

Step 724 is carried out former BlueDrama deletion and is transmitted tunnel release flow process.This flow process can be triggered by timer by former P-GW or former MME.

In the above-mentioned flow chart 7, target S-GW finds it is the switching of striding P-GW in step 704, then needs the downlink data message of the follow-up arrival of buffer memory, after the data channel between step 721 target S-GW and Target Wireless side network element is set up, just mails to terminal.

Above-mentioned flow process safeguard by P-GW and preserve terminal to client information, in handoff procedure, can adopt aforesaid way two to safeguard handling of terminal to client information with to the data message, compare with the flow process of Fig. 5, just the path difference that client information is transmitted of terminal.

P-GW that the P-GW of the above-mentioned flow process correspondence functional module relevant with switching with MME and Fig. 5 flow process are corresponding and the functional module of MME are basic identical, difference mainly is the relevant function that the tunnel is set up between P-GW, and these two functions are controlled foundation by MME in the above-mentioned flow process.Particularly:

MME comprises that also the tunnel sets up module, be used for after having determined to be different from target P-GW of former P-GW, set up the forwarding tunnel of incision terminal between former P-GW and target P-GW by target S-GW to the request of target P-GW, this target P-GW is delivered to former MME for the forwarding Tunnel Identifier of this forwarding tunnel distributing; And, receive that target P-GW is after cutting out the forwarding Tunnel Identifier of terminal distribution, send to former P-GW by former S-GW and transmit tunnel foundation request, carry this forwarding Tunnel Identifier;

Corresponding the changing into of function of module set up in second tunnel among the P-GW: be used to receive that target MME sends for after the incision terminal sets up the request of transmitting the tunnel between former P-GW and target P-GW, should transmit the forwarding Tunnel Identifier in tunnel for this incision terminal distribution; And after receiving that former MME is to cut out the forwarding Tunnel Identifier of terminal distribution by target P-GW of transmitting the tunnel request of setting up and carrying, set up with this target P-GW between the forwarding tunnel, and reply to this former MME by former S-GW and to transmit tunnel and set up and respond.

In addition, when the incision control module of MMN transmits the AID of incision terminal, can not will the address information of former P-GW be sent to target P-GW together.The function of the packet forwarding module of P-GW and opposite end maintenance of information module sees also above the description to the function of two times these two modules of mode.

Fig. 8 shows on the basis of the Fig. 3 or the network architecture shown in Figure 4, and terminal is striden the flow process of P-GW handoff procedure.Do not have signaling interface between the P-GW, set up data forwarding passage between former P-GW and the target P-GW by MME, metadata cache is at S-GW.Concrete steps are described below:

Step 801-805 is with step 701-705, also promptly with step 501-505;

Step 806, target P-GW replys session to target S-GW and sets up response message, and target S-GW replys session to target MME and sets up response message, all carries the new RID of this terminal;

Step 807, target MME initiates the RID registration, and the RID of this terminal that this terminal attaching ILR is preserved is updated to new RID;

Step 808-813 is with step 708-713;

Step 814, former P-GW replys former S-GW and transmits tunnel foundation response, and former S-GW replys former MME and transmits tunnel foundation response;

In this flow process and since be MME preserve terminal to client information, transmit in the tunnel response carried terminal not to client information, but can carry the AID-RID map information of these all Correspondent Nodes of terminal.

At this moment, data flow is described below:

The downlink data message that the Correspondent Node that former P-GW receives is issued terminal flows to: former P-GW-＞target P-GW-＞target S-GW, data will be buffered among the target S-GW.

The downlink data message flow direction that the Correspondent Node that target P-GW receives is issued terminal is: target P-GW-＞target S-GW, data will be buffered among the target S-GW.

The flow direction of uplink data messages is: terminal-＞former wireless side network element-＞former S-GW-＞former P-GW.

Step 815, former MME sends switching command to former wireless side network element;

Step 816, former wireless side network element sends switching command to terminal;

Step 817, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 818, Target Wireless side network element notification target MME switches;

Step 819, notification message is finished in target MME commentaries on classics before former MME sends reorientation;

Step 820, former MME changes before target MME replys reorientation and finishes acknowledge message, carry this terminal to client information, go back the AID-RID map information of these all Correspondent Nodes of terminal of portability;

Step 821, target MME to opposite end MME transmission RID update notification, carries this terminal AID and new RID according to the address information that the AID to Correspondent Node in the client information of this terminal finds opposite end MME;

Step 822, target MME sends to target S-GW and revises bearing request message, and target S-GW sends to target P-GW and revises bearing request message;

Revise the AID-RID map information that bearing request message can be carried these all Correspondent Nodes of terminal for above-mentioned two.After the data channel between this step target S-GW and Target Wireless side network element was set up, target S-GW just mail to terminal with downlink data.

If can't help P-GW sends the RID update notification and also do not transmit the AID-RID map information of this terminal communication opposite end, target S-GW does not need to send to target P-GW and revises bearing request message.

Step 823, target P-GW responds the bearing modification result to target S-GW, and target S-GW responds the bearing modification result to target MME;

Step 824 is carried out former BlueDrama deletion and is transmitted tunnel release flow process.This flow process can be triggered by timer by former P-GW or former MME.

In the above-mentioned flow process, by P-GW and the common maintenance terminal of MME to client information, P-GW checks the data message, flows real-time detection etc., with needs upgrade to client information notice MME, by MME preserve and maintenance terminal to client information.In this case, after forwarding tunnel between former P-GW and target P-GW was set up, to the maintenance and the transmission of client information, the processing of data message can be in the following ways:

Mode three, by former side and target side P-GW, MME maintenance terminal to client information.

After transmitting the tunnel and setting up, former P-GW directly is forwarded to target P-GW after receiving downlink data message, former MME continue to safeguard this terminal of preserving to client information; Target P-GW the downlink data message of receiving is separated RID encapsulation and check after transmit again, this terminal that needs are upgraded to client information notification target MME, target MME preserve in this locality, safeguard this terminal to client information.Afterwards, this terminal that former MME will preserve client information is sent to target MME (as be carried in to change before the reorientation finish in the acknowledge message), this terminal of preserving with this locality that target MME will receive client information is merged client information is safeguarded after being combined afterwards;

During employing mode three, the flow direction of uplink data messages and to the encapsulation process of data message with mode two.Only need set up descending forwarding tunnel between target P-GW and the former P-GW.

The difference of P-GW that the P-GW of the above-mentioned flow process correspondence functional module relevant with switching with MME and Fig. 7 flow process are corresponding and the functional module of MME be RID registration, RID upgrade, to the maintenance and the transmission of client information, reach functions such as processing, be specifically related to lower module to the data message:

P-GW does not have RID Registering modules, RID update module and opposite end maintenance of information module;

Incision control module among the P-GW also is sent to target MME with this new RID through target S-GW for having cut terminal distribution behind the new RID; And after forwarding tunnel between this P-GW and former P-GW sets up, the data message of issuing the incision terminal is separated the RID encapsulation and is checked, send opposite end information updating notice to target MME, carry this incision terminal of needing renewal to client information.

The control module that cuts out of P-GW also was used for before the forwarding tunnel between this P-GW and target P-GW is set up, the data message of receiving that cuts out terminal of issuing is separated RID encapsulation and inspection, send out opposite end information updating notice to former MME, carry this that need to upgrade cut out terminal to client information; After this transmits tunnel foundation, directly be transmitted to target P-GW with issuing this data message that cuts out terminal.

MME comprises RID Registering modules, opposite end maintenance of information module and RID update module;

The incision control module of MME activates the RID Registering modules of this MME after receiving this new RID.

The RID Registering modules of MME is used for behind the new RID that receives the incision terminal, and ILR sends register requirement to the incision terminal attaching, carries the AID of this incision terminal and new RID.

What the opposite end maintenance of information module among the MME was used to preserve terminal safeguards this to client information to client information and according to the update notification of P-GW, comprising the correspondence relationship information of terminal AID and Correspondent Node AID.

Among the MME cut out control module also be used for by change before the reorientation finish that acknowledge message will preserve cut out terminal client information is sent to target MME.

Incision control module among the MME also is used at the new RID that receives the incision terminal that target P-GW sends, and with former MME that transmit with this incision terminal local maintenance client information is merged after, activate the RID update module among this MME.

RID update module among the MME is used for the AID to the client information Correspondent Node according to the incision terminal, inquire the address information of the MME of Correspondent Node access, the MME that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

Above-mentioned flow process also can have one to become example, by P-GW safeguard and preserve terminal to client information, and the RID that sends to the opposite end upgrades.At this moment, the variation with respect to above-mentioned flow process is:

Two forwarding tunnels in the step 814 set up response message answer carried terminal to client information, former MME receive the back buffer memory this to client information;

Step 821 cancellation;

In the step 822, the modification bearing request message that target MME sends to target S-GW, and the modification bearing request message that sends to P-GW of target S-GW all carry this terminal to client information;

Step 822 back increases a step 822a, and target P-GW after this locality is searched or found the RID of opposite end to ILR, sends RID update notification to the opposite end gateway according to the AID to Correspondent Node in the client information of this terminal, carries the AID of this terminal and new RID;

This change example can adopt mode two to safeguard client information and deal with data message.The flow process of this change example is compared with Fig. 7 flow process, just the RID registration is changed by target MME and finishes.

Fig. 9 shows on the basis of the network architecture shown in Figure 2, and terminal is striden the flow process of P-GW handoff procedure.In this flow process, do not have signaling interface between the P-GW, need to set up data forwarding passage between P-GW by MME, metadata cache is at the wireless side network element.

The step of the flow process that the step of this flow process is corresponding with Fig. 7 is basic identical, and step 901-924 corresponds respectively to step 701-724, and difference is:

Step 909 is on the basis of step 709, and need carry Target Wireless side network element at Target Wireless side network element in the switching request acknowledgement message that target MME responds is the tunnel information that is established to the tunnel distributing of target MME;

Step 910 is on the basis of step 710, set up in the request message to the forwarding tunnel that target S-GW sends at target MME, need carry the described tunnel information that Target Wireless side network element distributes, after target S-GW receives, the downlink tunnel between foundation and Target Wireless side network element;

Like this, after step 914 is set up forwarding tunnel between former P-GW and the target P-GW, the downlink data message of issuing terminal that former P-GW receives will be buffered in the Target Wireless side network element after target P-GW, target S-GW transmit.

Correspondingly, the P-GW corresponding with Fig. 7 flow process compares with the function of MME, and the difference of the function of this flow process P-GW and MME is as follows:

The incision control module of MME is before forwarding tunnel between target P-GW and the former P-GW is set up in control, and mutual by with Target Wireless side network element and target S-GW is for the incision terminal is set up carrying between this Target Wireless side network element and this target S-GW;

The packet forwarding module of P-GW is given target P-GW with the data message forwarding of receiving that cuts out terminal of issuing after the forwarding tunnel between this P-GW and the target P-GW is set up; And, after receiving the data message of issuing the incision terminal, be transmitted to target S-GW;

S-GW is transmitted to Target Wireless side network element after receiving the data message of issuing the incision terminal that target P-GW transmits;

Target Wireless side network element is advanced row cache after receiving the data message of issuing the incision terminal, after this incision terminal switches to this Target Wireless side network element, the data in buffer message is sent to this terminal.

Similarly, based on the network architecture shown in Figure 3, on the basis of Fig. 8 flow process, can be the tunnel information of tunnel distributing between foundation and target S-GW by transmitting Target Wireless side network element to target MME in step 810, set up to the forwarding tunnel that target S-GW sends at step 811 target MME and to carry this tunnel information in the request message, between target S-GW and Target Wireless side network element, set up downlink tunnel in advance for this terminal.Thereby make the downlink data message of issuing terminal that former P-GW receives after target P-GW, target S-GW transmit, be buffered in the Target Wireless side network element.

The mode of setting up downlink tunnel between target S-GW and Target Wireless side network element earlier also can be used for the network architecture of Fig. 2, target MME can be after receiving the tunnel information that Target Wireless side network element distributes, special notification is target S-GW once, thereby sets up the downlink tunnel of this terminal between target S-GW and Target Wireless side network element in advance.

In order to simplify description, the flow process of above Fig. 6 to Fig. 9 is to be that example illustrates with the situation of striding P-GW.If P-GW does not change in the terminal moving process, no longer set up the data forwarding passage between the P-GW when then switching, P-GW need not to be the new RID of terminal distribution, need not to send to the RID register flow path of ILR and to the RID of opposite end new technological process more, in addition, other processing is similar to the aforementioned embodiment, no longer is repeated in this description at this.

Under the situation that P-GW does not change, also can adopt and set up the downlink message forwarding that forwarding interface is realized handoff procedure between the S-GW, metadata cache is at S-GW.Its flow process as shown in figure 10 can be based on the network architecture of Fig. 2, Fig. 3 or Fig. 4.Concrete steps are described below:

Step 1001, wireless side network element judge that needing to send S1 switches;

Step 1002, former wireless side network element sends handoff request to former MME;

Step 1003, former MME changes request message before the reorientation that sends to target MME;

Step 1004, target MME sends session to target S-GW and sets up request, is with the P-GW relevant information, comprises the Tunnel Identifier of P-GW address and this P-GW; Target S-GW sends carrying to P-GW and sets up request, carries the Tunnel Identifier into the tunnel distributing between foundation and target P-GW, and P-GW preserves the tunnel information of former S-GW and target S-GW simultaneously;

Step 1005, P-GW replys target S-GW carrying and sets up response; Target S-GW replys session to target MME and sets up response message;

Step 1006, target MME request target wireless side network element are carried out and are switched;

Step 1007, Target Wireless side network element is responded switching request acknowledgement message to target MME, does not carry the forwarding tunnel information;

Step 1008, target MME sends to target S-GW and transmits tunnel foundation request, and the data forwarding tunnel between the S-GW is set up in request;

Step 1009, target S-GW replys target MME and transmits tunnel foundation response, carries the forwarding Tunnel Identifier that distributes for the data forwarding tunnel of setting up between the S-GW;

Step 1010, target MME changes response message before former MME sends reorientation;

Step 1011, former MME sends to former S-GW and transmits the tunnel and set up request, request set up S-GW and between data forwarding tunnel, carry this forwarding Tunnel Identifier that target S-GW distributes;

Step 1012, former S-GW replys former MME and transmits tunnel foundation response;

Step 1013, former MME sends switching command to former wireless side network element;

Step 1014, former wireless side network element sends switching command to terminal;

At this moment, the data of former network will mail to objective network from the forwarding tunnel between the S-GW;

Step 1015, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 1016, Target Wireless side network element notification target MME switches;

Step 1017, notification message is finished in target MME commentaries on classics before former MME sends reorientation;

Step 1018, acknowledge message is finished in former MME commentaries on classics before target MME replys reorientation;

Step 1019, target MME request target S-GW revises beared information, carries the tunnel information that Target Wireless side network element distributes;

Step 1020, target S-GW responds the bearing modification result to target MME;

Step 1021 is carried out former BlueDrama deletion and is transmitted tunnel release flow process.This flow process can be triggered by timer by former MME.

If adopt MME preserve terminal to client information the time, the transmission of client information and the decline that is maintained in Fig. 5 a flow process are illustrated, no longer repeat here.

In order to simplify description, more than all embodiment situation about all changing with MME be that example illustrates that terminal do not have fixed anchor point switching processing process.When terminal moved, MME may not change yet, and this moment, other processing was consistent with the foregoing description except that the Signalling exchange that no longer needs between the MME, can not impact setting forth the present invention, so no longer be repeated in this description at this.

In order to simplify description, more than all embodiment be that example illustrates that terminal do not have fixed anchor point switching processing process all with the system that has MME.In having the EPS network of S4SGSN, the function of MME can be finished by SGSN, and other processing are consistent with the foregoing description, can not impact setting forth the present invention, so no longer be repeated in this description at this.

P-GW can be combined into an access network element with S-GW, at this moment, does not need to exist the interface between S-GW and the P-GW in the foregoing description, and the network element between all and S-GW and the P-GW will carry out interface with this access network element.The Network Element Function of system, interface (except the S5 mouth), flow process are consistent with the foregoing description, are not described in detail in this.

The mode that network element is searched terminal attaching HSS, ILR, PTF can be to realize by inquiring about local configuration.

Above-mentioned flow process is not limited to the EPS network, has the network architecture that similar chain of command separates with the medium face for other, also can be suitable for.The network architecture that described similar chain of command separates with the medium face comprises the IAD that is connected between wireless side network element and the packet data network, and the mobile management node (Mobility Management Node:MMN) that links to each other with the wireless side network element with IAD, linking to each other between the network element is meant to have signaling and/or data-interface between the network element.The mobile management node can have different titles with IAD in the different network architectures, can be corresponding to the part in an existing network element or a plurality of network element or the network element.The mobility management node is responsible for the related work of chains of command such as the processing of mobile management, Non-Access Stratum signaling of terminal and the contextual management of user's mobile management; IAD is the gateway device that connects wireless access network and packet data network, and being used to be responsible for terminal provides access service, reaches functions such as transmitting data between wireless access network and packet data network.

In the above-mentioned network architecture, the function of IAD is realized by gateway in grouping system (EPS) network architecture of evolution and grouped data network gateway, the mobile management node is by MME in the EPS network architecture and/or SGSN, and wireless access network is the universal mobile telecommunications system land radio access web (E-UTRAN) of evolution.But in other embodiments, this correspondence also can be different.For example the function of IAD also can be by Ultra-Mobile Broadband (UMB, Ultra Mobile Broadband) IAD (AGW of system, Access GateWay) realizes, the mobile management node can be that Serving GPRS Support Node (SGSN) in the 3G system is as S4SGSN or Ultra-Mobile Broadband (UMB, Ultra MobileBroadband) the session citation network controller (SRNC of system, Session Reference NetworkController), wireless access network also can be universal mobile telecommunications system land radio access web (UTRAN) or Ultra-Mobile Broadband wireless access system or the like.

Correspondingly, communication network provided by the invention comprises wireless side network element, IAD, and and wireless side network element and IAD between have the mobile management node (MMN) of signaling interface, has data-interface between IAD and wireless side network element and the packet data network, also comprise the identity location register (ILR) that has signaling interface with IAD and/or MMN, wherein:

When MMN is used to the incision terminal to determine a target access gateway different with former IAD, the identify label (AID) of this incision terminal is sent to this target access gateway;

IAD is used for behind the AID that receives the incision terminal that target MMN transmits, for the new station location marker of this terminal distribution (RID) and preserve the map information of this terminal AID and this new RID, and the data message of this incision terminal carried out the RID encapsulation, separates that RID encapsulates and forwarding;

IAD or MMN also are used for sending register requirement to incision terminal attaching ILR, carry the new RID of this incision terminal;

ILR is used to safeguard the AID-RID map information of home subscriber terminal, receive register requirement to the incision terminal after, the RID of this incision terminal of preserving is updated to this new RID.

Further, when the RID renewal is finished by MMN:

It is being the incision terminal distribution behind the new RID that IAD also is used for, and the RID that this is new is sent to target MMN;

MMN also is used for behind the new RID that receives the incision terminal, and the gateway that inserts to the Correspondent Node of this terminal sends the RID update notification, carries AID and this new RID of this terminal.

Further, when the RID renewal is finished by IAD:

IAD also be used for maintenance terminal to client information, comprise the correspondence relationship information of this terminal AID and Correspondent Node AID; In handoff procedure, with safeguard cut out terminal client information is sent to this target access gateway; And for the incision terminal distribution new RID and receive this incision terminal that former IAD sends to behind the client information, to gateway transmission RID update notification that Correspondent Node of this incision terminal inserts, carry AID and this new RID of this terminal.

Further, MMN and IAD can cooperate to finish transmits the function that the tunnel is set up and downlink message sends, as follows:

MMN also is used for after determining to be different from the target access gateway of former IAD, and is mutual with target access gateway and former IAD, sets up the forwarding tunnel of incision terminal between this target access gateway and former IAD; Perhaps, IAD also is used for by the signaling interface between IAD, for the incision terminal is set up forwarding tunnel between this IAD and former IAD;

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the method switched of a terminal is applied to comprise the wireless side network element, is connected the communication network of IAD, mobile management node and identity location register (ILR) between wireless side network element and the packet data network, and this method comprises:

2. the method for claim 1 is characterized in that:

3. method as claimed in claim 1 or 2 is characterized in that:

4. method as claimed in claim 2 is characterized in that:

5. the method for claim 1 is characterized in that:

6. method as claimed in claim 5 is characterized in that:

7. method as claimed in claim 6 is characterized in that:

8. method as claimed in claim 6 is characterized in that:

9. method as claimed in claim 6 is characterized in that:

10. method as claimed in claim 6 is characterized in that, the data forwarding passage of this terminal is set up by following process between this target P-GW and former P-GW:

11. method as claimed in claim 10 is characterized in that:

12. method as claimed in claim 6 is characterized in that:

13. method as claimed in claim 9 is characterized in that:

14. method as claimed in claim 10 is characterized in that:

15. method as claimed in claim 6 is characterized in that:

16., it is characterized in that as claim 12,13 or 15 described methods:

17., it is characterized in that as claim 12,13 or 14 described methods:

18., it is characterized in that as claim 13 or 14 described methods:

19. method as claimed in claim 13 is characterized in that:

20., it is characterized in that as claim 9 or 10 described methods:

21., it is characterized in that as claim 6 or 10 described methods:

22., it is characterized in that as claim 15 or 18 described methods:

23. method as claimed in claim 19 is characterized in that:

24. method as claimed in claim 5 is characterized in that:

25. method as claimed in claim 6 is characterized in that, in this handoff procedure with terminal being connected foundation, discharging relevant processing and comprise to former side between the packet data network and target side:

26. method as claimed in claim 5 is characterized in that:

27. communication network that chain of command separates with the medium face, comprise wireless side network element, IAD, and and wireless side network element and IAD between have the mobile management node (MMN) of signaling interface, has data-interface between described IAD and wireless side network element and the external packet data network, be used to transmit the data between wireless side network element and packet data network, it is characterized in that, also comprise the identity location register (ILR) that has signaling interface with described IAD and/or MMN, wherein:

28. communication network as claimed in claim 27 is characterized in that:

29. communication network as claimed in claim 27 is characterized in that:

30. communication network as claimed in claim 27 is characterized in that:

31. communication network as claimed in claim 27 is characterized in that:

32. communication network as claimed in claim 31 is characterized in that:

Described MMN comprises:

Described P-GW comprises:

33. communication network as claimed in claim 32 is characterized in that:

34. communication network as claimed in claim 32 is characterized in that:

35. communication network as claimed in claim 32 is characterized in that:

36. communication network as claimed in claim 34 is characterized in that:

37., it is characterized in that as claim 32 or 35 described communication networks:

38. communication network as claimed in claim 37 is characterized in that:

39. communication network as claimed in claim 36 is characterized in that:

40. communication network as claimed in claim 36 is characterized in that:

41., it is characterized in that as claim 34 or 35 described communication networks:

42. communication network as claimed in claim 35 is characterized in that:

43., it is characterized in that as claim 38 or 39 or 40 described communication networks:

44. method as claimed in claim 27 is characterized in that:

45. communication network as claimed in claim 34 is characterized in that: