CN100396054C

CN100396054C - Method for transmitting service flow data packets between interior and exterior universal mobile telecommunication system (UMTS)

Info

Publication number: CN100396054C
Application number: CNB2004100388136A
Authority: CN
Inventors: 陈悦鹏; 马朝晖
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-04-30
Filing date: 2004-04-30
Publication date: 2008-06-18
Anticipated expiration: 2024-04-30
Also published as: CN1691641A

Abstract

The present invention discloses a method for transmitting service flow data packets between interior and exterior universal mobile telecommunication systems (UMTS). When wireless communication crossing the range of a UMTS domain, a calling UMTS sends a QoS resource request to an exterior IP backbone network by the addition of a Gq+ interface, and the IP backbone network sends a QoS resource request to a called UMTS by the addition of the Gq+ interface. All the networks send interior selected label switch paths (LSP) to the gateway general support node (GGSN) of a gateway general packet radio service (GPRS) in the calling UMTS respectively, and GGSN transmits a service flow data packet to the called through the exterior IP backbone network of UMTS and all levels of routers of the called UMTS according to received LSP in the interior IP backbone network and the exterior IP backbone network of UMTS to a called party. The method of the present invention can ensure QoS between GGSN inside UMTS and the exterior IP backbone network of UMTS.

Description

The method of transport service stream packets between universal mobile telecommunications system inside and outside

Technical field

The present invention relates to network transmission technology, particularly related to a kind of in universal mobile telecommunications system (UMTS) method of transport service stream packets between inner and its external the Internet agreement (IP) backbone network.

Background technology

UMTS is the 3-G (Generation Three mobile communication system) (3G) that adopts Wideband Code Division Multiple Access (WCDMA) (WCDMA) system air interface technologies, and the UMTS system is commonly called the WCDMA system.The UMTS system adopts and the similar structure of second generation mobile communication system, comprise Radio Access Network (Radio AccessNetwork, RAN) and core network (Core Network, CN).Wherein, RAN realizes the function relevant with wireless access, and CN realizes that all voice calls are connected with data in the UMTS system, and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (CircuitSwitched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).

PS territory in the UMTS core network adopts Internet protocol (IP) as its bearing protocol.Because the IP technology is adopted in the PS territory, and there is (QoS) shortcoming that guarantees that do not have QoS in the IP technology, thereby causes the PS territory also to have the shortcoming of no QoS assurance.

But all multi-services that UMTS provides such as business, particularly multimedia service such as speech, variable-speed data and motion video sessions, have proposed strict requirement to QoS.Do not have the problem of QoS for the PS territory that solves UMTS, realize that QoS guarantees that the end-to-end QoS framework of UMTS is suggested (3GPP TS23.207) end to end.

Fig. 1 is the end-to-end QoS framework schematic diagram of UMTS in the prior art.As shown in Figure 1, in UMTS inside, the QoS framework of wireless core network (CN) side comprises Application Function (AF), strategy decision functional entity (PDF) and gateway general packet radio service (GPRS) support node (GGSN), wherein,

AF provides the function of application that needs control IP carrying demand, and by Gq interface and the mutual dynamic QoS related service of PDF message; PDF is logic strategy decision unit, carries out strategy based on the resource request of AF and session information and determines, and by Go interface tactful determination result is issued to GGSN; GGSN provides CN and route external data network between and the encapsulation function of packet in UMTS inside, and the strategy that PDF issues is installed, and carries out the forwarding of packet according to strategy.

Fig. 2 is the flow chart that guarantees the inner CN side of UMTS QoS in the prior art.As shown in Figure 2, prior art guarantees that the process of the inner CN side of UMTS QoS is:

Step 201, AF receive the service conversation message that calling part user equipment (UE) is sent, obtain the qos parameter of this service conversation message, this qos parameter has been specified the required bandwidth of this service conversation, and the AF QoS resource request that will carry qos parameter is sent to PDF then.

Here, if the calling subscriber has specified qos parameter in service conversation message, so, AF directly obtains qos parameter from the service conversation message that receives, if the calling subscriber does not specify qos parameter in service conversation message, so, AF is according to being the qos parameter of this service conversation of grade setting of this calling subscriber setting in advance.

Step 202, PDF make the qos policy decision according to receiving the qos parameter that carries in the QoS resource request, set the bandwidth of this service conversation, and PDF is sent to GGSN with the qos policy decision then.

Step 203, UE are sent to GGSN by Serving GPRS Support Node (SGSN) with its traffic data bag, and GGSN uses its bandwidth that receives this service conversation that carries in the qos policy decision, and are with its forwarding behind this traffic data bag selection path.

After step 204, AF received the termination service conversation message that UE sends, notice PDF cancelled corresponding QoS resource authorization, and PDF reinforms GGSN and deletes corresponding qos policy.

For the radio communication of striding UMTS territory scope by the external IP backbone network, guarantee in order to reach end-to-end QoS, to realize that not only the QoS of CN side in the UMTS guarantees, also to realize that the QoS of the outer IP backbone of UMTS guarantees simultaneously.

At present, the QoS measure of UMTS external IP backbone network comprises integrated service (IntServ) model and differentiated service (DiffServ) model.

Integrated service (IntServ) model uses resource reservation (RSVP) agreement, and RSVP is a kind of signaling protocol of reserved resource.Fig. 3 uses integrated service model to guarantee the flow chart of the QoS of UMTS external IP backbone network in the prior art.As shown in Figure 3, integrated service model guarantees that the process of the QoS of the outer IP backbone of UMTS is:

The edge router of step 301, integrated service model receives path (PATH) message that GGSN sends, carry the qos parameter that characterizes the required bandwidth of this traffic data bag in this PATH message, edge router is sent to downstream router with this PATH message then.

Here, the PATH message at GGSN place is that calling party UE sends by SGSN.

Step 302, each level router send the PATH message of appointment step by step downwards, until callee UE.

Step 303, from callee UE step by step upwards to edge router, and calling party GGSN, and be forwarded to calling party UE through SGSN and send RESV message, this RESV message request upstream router reserves qos parameter designated bandwidth resource, and, each level router is when receiving RESV message, judge respectively whether it currently exists available bearing resource, if exist, then execution in step 305, if there is no, execution in step 304 then.

Step 304, the router that does not have a bearing resource do not send RESV message to its upstream router, and this upstream router and other upstream routers at different levels do not receive RESV message in setting-up time, think that then resource reservation is unsuccessful, jump out this flow process.

When step 305, each level router all receive RESV message to edge router, be this professional bandwidth reserved, and preserve relevant flow state information.

Step 306, edge router receive the traffic data bag that GGSN sends, and edge router and other each level router transmit this traffic data bag according to specified path, until callee UE.

Using integrated service model to guarantee that each level router upgrades the state information of its preservation respectively in the process of the QoS of IP backbone outside the UMTS after receiving the PATH and RESV message that refreshes.

In differentiated service (DiffServ) model, the client signs service class contract (SLA) with Network Provider in advance.SLA is clear and definite this client's business-level and the traffic that in each business-level, is allowed, the i.e. required transmission bandwidth of traffic data bag.The differentiated service model guarantees that the process of the QoS of the outer IP backbone of UMTS is: during traffic data bag that the SGSN in receiving the UMTS network sends, GGSN in the UMTS network carries out priority classification according to this user's rank for the traffic data bag, and it is transferred to edge router in the network; Each level router need not to judge its current load condition when receiving the traffic data bag, only according to the priority of this traffic data bag it is transmitted, until receiving terminal.

The above process is that the IP backbone of UMTS outside receives signaling and the traffic data bag that the inner GGSN of calling party UMTS sends, that is to say, from the GGSN of calling party UMTS inside to UMTS external IP backbone transmission service stream packets and guarantee the process of its QoS.And the GGSN transport service stream packets from UMTS external IP backbone network to callee UMTS inside and guarantee that the process of its QoS is identical with the principle of said process.

As seen, there is following shortcoming in prior art:

1, when striding the radio communication of UMTS territory scope, for the differentiated service model, the QoS of UMTS inside guarantees to guarantee it is two independently processes with the QoS of UMTS external IP backbone network, carry out the QoS assurance according to its Business Stream that receives respectively with overseas in the UMTS territory, even guarantee so Business Stream obtains QoS in UMTS inside, and when it arrives the external IP backbone network, probably because IP backbone does not have sufficient bearing resource, make Business Stream be rejected or lose, thereby can't guarantee QoS between the inner and UMTS external IP backbone network of UMTS.

When 2, UMTS external IP backbone network adopts the integrated service model guaranteed qos, need be to the PATH and the RSVP state information of each its preservation of equipment periodic refreshing, and a large amount of periodic refreshing PATH and RSVP state information are very big to processor, buffer (Buffer) and the memory consumption of the network equipment, and influence the stability of backbone network, do not possess extensibility, thereby seriously restricted the application of integrated service model in real network.

3, during the employing differentiated service model guaranteed qos of UMTS external IP backbone network, because each level router can't judge whether and can provide quality assurance for business according to network topology and resource situation, just directly transmit, thereby can't when session is set up, provide QoS to guarantee according to the priority of traffic data bag.

Fig. 4 is the QoS framework schematic diagram that UMTS external IP backbone network adopts independent resource control in the prior art.As shown in Figure 4, in order to solve the shortcoming that UMTS external IP backbone network adopts integrated service model or differentiated service model guaranteed qos, at present, a kind of QoS model that adopts independent resource control at the IP backbone of UMTS outside has been proposed, this QoS model can be divided into three layers according to function, is respectively: service control layer, bearer control layer and bearing bed.Wherein, service control layer is made up of all kinds of service servers of the processing grouped data application in the IP backbone network, to the bearer path of bearer control layer application Business Stream; Bearer control layer, (RM) forms by several explorers, be in charge of the Internet resources of bearing bed, comprise bandwidth, processor and buffer (Buffer) etc., carry out resource for every data service application that the Business Stream of qos requirement arranged and allow control, resource allocation and routing, satisfy the qos requirement of Business Stream; Bearing bed is divided into basic bearer network layer and logical bearers network layer, and the IP backbone network physical entity that basic bearer network layer is made up of edge router and core router carries all kinds of IP operation bags.The logical bearers network layer is each logical bearers network that utilizes label switched path (LSP) technology to plan in advance on basic bearer network layer and dispose, the IP operation bag of each logical bearers network carrying particular traffic type or specific QoS grade.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method for transport service stream packets between universal mobile telecommunications system inside and outside, makes the QoS between its GGSN that can guarantee UMTS inside and the UMTS external IP backbone network.

In order to achieve the above object, technical scheme of the present invention is achieved in that

The method of transport service stream packets between universal mobile telecommunications system inside and outside, it is outside in the system of Internet protocol IP backbone to be applied to universal mobile telecommunications system (UMTS), and this method may further comprise the steps:

Among A, the caller UMTS, after Application Function AF receives the service conversation message that the calling party sends, the resource request of carrying the QoS parameter is sent to strategy decision functional entity PDF;

The resource request that PDF among B, the caller UMTS will carry the QoS parameter is sent to the actual resource manager of bearer control layer in the UMTS external IP backbone network, the resource request that this explorer will carry the QoS parameter again is sent to the PDF among the called UMTS

PDF among the caller UMTS, explorer in the UMTS external IP backbone network and the PDF among the called UMTS be according to the QoS parameter of carrying in the resource request, is be responsible for assigning bandwidth and select label switching path LSP of this traffic data respectively in each automatic network;

GGSN among C, the caller UMTS is according among the selected caller UMTS among the step B, in the external IP backbone network and the LSP among the called UMTS, transmit this traffic data bag by each level router among UMTS external IP backbone network and the callee UMTS, until the callee.

Carry in the service conversation message that described QoS parameter is sent for the calling party.

Described QoS parameter is that AF determines according to predefined this calling subscriber's user class.

After described explorer received the resource request of carrying the QoS parameter that PDF sends, step B comprised:

B0, explorer judge whether there is available bearer network resource in UMTS external IP backbone network, if exist, then this explorer resource request that will carry the QoS parameter again is sent to the PDF among the called UMTS, otherwise, step by step return failed message through PDF, AF the caller UMTS to the calling party from explorer, and jump out this flow process.

Gq+ interface and explorer mutual described QoS resource request and the LSP of PDF among described caller UMTS or the called UMTS by setting up.

Described step B further comprises:

PDF among B1, the called UMTS is sent to explorer in the external IP backbone network with the LSP of its selection;

The LSP that B2, explorer receive LSP and its of its selection is sent to the PDF among the caller UMTS;

The LSP that PDF among B3, the caller UMTS receives LSP and its of its selection again is sent to the GGSN among the caller UMTS.

Described step C comprises:

GGSN among C1, the caller UMTS successively successively is pressed in traffic data bag to each grade LSP of calling party the callee;

GGSN among C2, the caller UMTS is sent to UMTS external IP backbone network according to path shown in the top-level tab with the traffic data bag;

GGSN and each level router in C3, the UMTS external IP backbone network among each level router and the called UMTS, finish forwarding according to path shown in the top-level tab in its traffic data bag that receives, and after finishing forwarding, the top-level tab in the traffic data bag is ejected.

After described step C, this method further comprises:

D1, in caller UMTS side, AF notice PDF stops this service conversation;

The GGSN of GGSN, the explorer in the UMTS external IP backbone network, the PDF among the called UMTS and the called UMTS side of D2, this PDF notice caller UMTS side stops this service conversation;

PDF and the explorer in the IP backbone among D3, this caller and the called UMTS discharge shared Internet resources respectively, the GGSN of this caller UMTS side and the GGSN of called UMTS side deletion corresponding business service quality policy.

As seen, the method for the present invention's proposition has the following advantages:

1, in the method for the invention, the IP backbone of UMTS outside adopts the QoS model of independent resource control, the service logic bearer network is allocated and planned to this model in advance by the multiprotocol label switching (mpls) technology, from carrying business and the internet professional separate managements such as (Internet) that needs service quality guarantee with all kinds of, thereby realizing resource management and routing for bearer control layer provides the foundation, and professional routing and resource management that bearer control layer comes process user have been set up in this model, the mechanism of the professional application of refusing user's when Internet resources are not enough, thereby guaranteed the transmission of user service flow packet in the overseas IP backbone of UMTS, guaranteed the QoS of service conversation.

2, in the UMTS territory, in order to carry out alternately with the overseas IP backbone of UMTS, the present invention has only increased the Gq+ interface between PDF and load network resource manager (RM), and PDF and GGSN are carried out function corresponding strengthen, and do not change the original QoS framework of UMTS, thereby make that the present invention is easy to realize, and greatly reduced impact original framework.

3, when striding the radio communication of UMTS territory scope, the PDF of UMTS inside and the RM in the IP backbone can carry out the Signalling exchange about Business Stream QoS, so when UMTS is inner or IP backbone does not have sufficient resources outside it, PDF then can notify AF refusal active user's business application, therefore avoid traffic data to wrap in and obtained the QoS assurance in the UMTS territory, and situation that can't guaranteed qos in IP backbone occurs, thereby has saved Internet resources, has improved the performance of system.

Description of drawings

Fig. 1 is the end-to-end QoS framework schematic diagram of UMTS in the prior art.

Fig. 2 is the flow chart that guarantees the inner CN side of UMTS QoS in the prior art.

Fig. 3 uses integrated service model to guarantee the flow chart of the QoS of UMTS external IP backbone network in the prior art.

Fig. 4 is the QoS framework schematic diagram that UMTS external IP backbone network adopts independent resource control in the prior art.

Fig. 5 is a QoS framework schematic diagram among the present invention.

Fig. 6 is the flow chart of the inventive method.

Fig. 7 is the schematic diagram in path shown in the label among the present invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and the specific embodiments.

Fig. 5 is a QoS framework schematic diagram among the present invention.As shown in Figure 5, in the present invention, the IP backbone of UMTS outside adopts the QoS model of independent resource control in the prior art.In UMTS inside, in order to make in the UMTS territory and to carry out the information interaction that QoS guarantees between overseas, each functional entity in wireless core network (CN) the side QoS framework is made the function corresponding adjustment:

The AF function remains unchanged.

PDF what's new: all bearing resources on the PS network management domain are managed; Finish the carrying routing function in the management domain, and carry out obtaining routing iinformation alternately by IP backbone with explorer (RM) in the IP backbone; QoS resource and IP carrying routing iinformation are integrated the decision of work strategy.

GGSN what's new: adopt the multistage label stack technology of MPLS, the corresponding business stream packets is stamped the multistage label stack of respective path, and in IP network, transmit according to the specified bearer path of PDF.

Go interface what's new: PDF can be handed down to GGSN with bearer path information with related with it QoS resource together by Go interface; PDF by Go interface to the GGSN inquiry Policy Status relevant with certain session, GGSN by Go interface to PDF feedback query result.

Gq interface what's new: AF by Gq interface to the PDF inquiry QoS resource status relevant with certain session, PDF by Gq interface to AF feedback query result.

Newly-increased Gq+ interface: Gq+ is the interface that increases newly, is arranged between the explorer (RM) of PDF and IP backbone, is used to transmit QoS resource, IP bearer path and other is used for carrying out the information of interactive strategy decision.

Fig. 6 is the flow chart of the inventive method, and Fig. 7 is the schematic diagram in path shown in the label among the present invention.As Fig. 5, Fig. 6 and shown in Figure 7, when striding the radio communication of UMTS territory scope, the inventive method realizes that the detailed process that guarantees the QoS between UMTS inside and the UMTS external IP backbone network may further comprise the steps:

Step 601, in calling party's UMTS side of living in, AF receives the service conversation message that the calling party sends, obtain the qos parameter of this service conversation message, this qos parameter has been specified the required bandwidth of this service conversation, and the AF QoS resource request that will carry qos parameter is sent to PDF then.

Here, if the calling subscriber has specified qos parameter in service conversation message, so, AF directly obtains qos parameter from the service conversation message that receives, if the calling subscriber does not specify qos parameter in service conversation message, so, AF is according to the qos parameter of this service conversation of grade setting that is this calling subscriber's setting in advance.And, in the service conversation message that calling party UE sends, carry called subscriber's positional information (as IP address or telephone number).

The traffic data bag that step 602, this PDF will insert for this service conversation according to the determined bandwidth of the qos parameter that carries in the QoS resource request reserves the bandwidth in calling party UMTS of living in inside, select the LSP of this UMTS inside, the QoS resource request that will carry qos parameter by the Gq+ interface is sent to the explorer (RM) in the external IP backbone network then.

Step 603, RM carry out routing according to called subscriber's positional information of carrying in this service conversation message in the bearing bed of IP backbone, and judge in routing process whether bearing resource is enough, if it is enough, then execution in step 605, otherwise, execution in step 604.

Step 604, RM return the application failed message by the PDF of Gq+ interface in calling party UMTS of living in, and this PDF returns the application failed message to AF again, and AF returns the application failed message to the calling subscriber again, the current business application of refusing user's, and jump out this flow process.

The traffic data bag that step 605, RM will insert for this service conversation according to the determined bandwidth of the qos parameter that carries in the QoS resource request reserves the bandwidth in the IP backbone externally, and select LSP in this IP backbone, the QoS resource request that will carry qos parameter by the Gq+ interface is sent to the PDF among the callee UMTS of living in then.

The traffic data bag that PDF among step 606, the callee UMTS of living in will insert for this service conversation according to the determined bandwidth of the qos parameter that carries in the QoS resource request reserves the bandwidth in callee UMTS of living in inside, and select the LSP of this UMTS inside, by the Gq+ interface LSP of its selection is sent to RM in the described external IP backbone network then.

Here, PDF each LSP of selecting identified traffic data wrap among the callee UMTS of living in the every paths between each router of process.

Step 607, RM are sent to PDF among the calling party UMTS of living in the LSP of the LSP among its callee UMTS that receives and its selection.

Step 608, in calling party's UMTS side of living in, PDF is sent to GGSN with LSP and the LSP in UMTS external IP backbone network that the LSP of its selection and its this traffic data that receives wrap among the callee UMTS of living in.

Step 609, after receiving the traffic data bag that the calling party sends by Serving GPRS Support Node (SGSN), GGSN stamps the multistage label stack of respective paths according to its LSP that receives step by step with this traffic data bag, uses the bandwidth that reserves then and according to path shown in the top-level tab it is transmitted to edge router in the UMTS external IP backbone network.

Here, GGSN at first successively beats the LSP among the callee UMTS of living in this traffic data bag, successively LSP in the UMTS external IP backbone network is beaten in this traffic data bag again, successively the LSP among the calling party UMTS of living in is beaten in this traffic data bag at last, as shown in Figure 6, the LSP that receives such as GGSN here for by label 1 to 2 to 3 again to 4, GGSN is according to label 4 so, label 3, label 2, the order of label 1 successively is pressed in the traffic data bag, make that top layer is the path that the transport service stream packets at first should be passed through, i.e. path shown in the label 1.

The path is transmitted to the next stage router with this traffic data bag shown in top-level tab when edge router in step 610, the UMTS external IP backbone network uses the bandwidth that reserves to receive this traffic data bag according to it.

Each level router of each level router in step 611, the UMTS external IP backbone network and the GGSN among the callee UMTS of living in and other uses the bandwidth that reserves and transmits the traffic data bag according to the top-level tab that it receives, simultaneously, when the LSP of top-level tab correspondence ended at certain router, this router ejected top-level tab.The rest may be inferred, until callee UE, after this callee UE ejects its top-level tab that receives, recovers the IP bag of Business Stream.

Here, as shown in Figure 7, such as, when router B receives the traffic data bag, because top-level tab is 2 in this traffic data bag, therefore, router B according to path shown in the label 2 promptly from router B to router C again to router D, this traffic data bag is sent to its adjacent downstream router C, router C is sent to router D according to path shown in the label 2 with this traffic data bag again, at this moment, because the LSP of label 2 correspondences ends at router D, thus router D this top-level tab 2 is ejected, at this moment, top-level tab in the traffic data bag then is 3, makes router D transmit the traffic data bag according to the path shown in the label 3.

In the present invention, when stopping service conversation, in calling party's UMTS side of living in, AF notice PDF stops this service conversation, PDF notifies GGSN, and discharging Internet resources on the way by the RM in the Gq+ interface notice IP backbone, RM notifies PDF and GGSN among the callee UMTS of living in to cancel corresponding qos policy by the Gq+ interface again.

This shows, in whole transmission course, when the traffic data bag is transferred to the external IP backbone network from the residing UMTS of calling party, QoS the inventive method can be guaranteed from the GGSN of UMTS inside to the external IP backbone network, when being transferred to the callee UMTS of living in from the external IP backbone network, the inventive method can be guaranteed the QoS from the IP backbone of UMTS outside to the GGSN of UMTS inside, and therefore, the inventive method has been guaranteed the QoS between the IP backbone of the inner and UMTS outside of UMTS.

In the present embodiment, traffic data bag path the LSP of process uses is overall label.In other embodiment beyond the present embodiment, also can use the LSP of the local label of interface, the principle of its specific implementation process is identical with the principle of the described process of present embodiment.

In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.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 for transport service stream packets between universal mobile telecommunications system inside and outside is applied to universal mobile telecommunications system UMTS outside in the system of Internet protocol IP backbone, it is characterized in that this method may further comprise the steps:

2. method according to claim 1 is characterized in that, carries in the service conversation message that described QoS parameter is sent for the calling party.

3. method according to claim 1 is characterized in that, described QoS parameter is that AF determines according to predefined this calling subscriber's user class.

4. method according to claim 1 is characterized in that, after described explorer received the resource request of carrying the QoS parameter that PDF sends, step B comprised:

5. method according to claim 1 is characterized in that, Gq+ interface and explorer mutual described QoS resource request and the LSP of the PDF among described caller UMTS or the called UMTS by setting up.

6. method according to claim 1 is characterized in that, described step B further comprises:

7. method according to claim 1 is characterized in that, described step C comprises:

8. method according to claim 1 is characterized in that, after described step C, this method further comprises:

D1, in caller UMTS side, AF notice PDF stops this service conversation;