CN100558196C - The method of transferring user terminal in service universal grouping wireless business supporting node pool - Google Patents
The method of transferring user terminal in service universal grouping wireless business supporting node pool Download PDFInfo
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- CN100558196C CN100558196C CNB2005100938200A CN200510093820A CN100558196C CN 100558196 C CN100558196 C CN 100558196C CN B2005100938200 A CNB2005100938200 A CN B2005100938200A CN 200510093820 A CN200510093820 A CN 200510093820A CN 100558196 C CN100558196 C CN 100558196C
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Abstract
The invention discloses a kind of method at transferring user terminal in service universal grouping wireless business supporting node pool, when source SGSN need to determine the transferring user terminal, for the user terminal allocation packet contains the P-TMSI of virtual NRI, source SGSN carries the P-TMSI of distribution and one and specifies duration in the renewal response of returning to user terminal then; After user terminal is received and upgraded response, start timer according to upgrading the appointment duration that carries in the response, timer then after, user terminal is initiated new update request; The virtual NRI that the RAN node provides according to user terminal determines that these user terminal needs shift, user terminal is transferred to target SGSN, user terminal was transferred among the new SGSN after more new technological process finished, make time that user terminal initiates new Routing Area Update fully by network controls, the perfect transfer flow of user terminal in the SGSN node pool.
Description
Technical field
The present invention relates to the core network technology, be meant especially a kind of in service universal packet wireless business is engaged in (GPRS) support node (SGSN, Serving GPRS Support Node) pond the method for transferring user terminal.
Background technology
According to third generation collaborative project (3GPP, 3rd Generation Partnership Project) standard, Radio Access Network (RAN, Radio Access Network) node can with a plurality of core network (CN, Core Network) node links to each other, and forms the corresponding relation of multi-to-multi.The RAN node can be radio network controller (RNC, Radio Network Controller) or base station controller (BSC, Basic StationController).The CN node of circuit domain is mobile switching centre (MSC, Mobile SwitchingCentre), and the CN node of packet domain is SGSN.
The notion of pool area has been proposed in the 3GPP standard, pool area is meant the zone that a plurality of RAN nodes cover, when user terminal is roamed in pool area, for providing the CN node of service, this user terminal can not change, can reduce like this owing to the CN node changes the more execution number of times of new technological process of the position causes, the Signalling exchange between the minimizing CN node.
A pool area provides service concurrently by a plurality of CN nodes usually, also can provide service by a CN node certainly.When a pool area provided service concurrently by a plurality of CN nodes, these CN nodes had just been formed a CN node pool, i.e. MSC pond or SGSN pond.A CN node pool can be simultaneously for a plurality of pool areas provide service, and promptly a CN node pool can be corresponding with a plurality of pool areas.
For CN node of unique identification in a CN node pool, each CN node in the CN node pool is assigned one or more network resource identifier (NRI, Network ResourceIdentifier), and by Operation and Maintenance the NRI that distributes is configured in the CN node, in order to identify the different CN nodes in the CN node pool.When the CN node is that user terminal distributes Temporary Mobile Subscriber Identity (TMSI, Temporary Mobile Subscriber Identity) or packet TMSI (P-TMSI, Packet Temporary Mobile Subscriber Identity) time, in TMSI/P-TMSI, inserts the NRI of this CN node.Variable-length is the 23rd bit to the 14 bits that the NRI of 0 to 10 bit (bits) is positioned at TMSI/P-TMSI.TMSI is by the CN node of circuit domain, is that MSC is that user terminal distributes; P-TMSI is by the CN node of packet domain, is that SGSN is that user terminal distributes.The actual significant bit length of NRI depends on the network planning among the TMSI/P-TMSI, and can pass through operation maintenance center (OMC, Operation and Maintenance Centre) and be configured.
Dispose the corresponding relation between the NRI and each CN node in the CN node pool in each RAN node of a pool area.In the CN node pool, dispose the corresponding relation between NRI and other CN nodes in each CN node.
When user terminal enters pool area, for user terminal provides the CN node of service, promptly serves the CN node includes this service CN node in the TMSI/P-TMSI that distributes for user terminal NRI.In this pool area, user terminal is established to the Non-Access Stratum of CN node at every turn, and (NAS, when Non-AccessStratum) connecting, the RAN node routes to CN node corresponding to NRI according to NRI with initial NAS message.Like this, can make user terminal in a pool area, use same CN node.Subscriber terminal equipment can be global system for mobile communications (GSM, Global System for MobileCommunications) travelling carriage (MS) in, also can be the UE in universal mobile communications (UMTS, the UniversalMobile Telecommunications Service) system.
If dispose pool area in the network, when CN node overload or CN node are just preparing to carry out attended operation (O﹠amp; M), as restarting before the edition upgrading, the user terminal in the CN node need be transferred to smoothly in other CN nodes in the CN node pool.For satisfying the demand, for each SGSN in the SGSN pond distributes virtual NRI and non-broadcasting Routing Area Identifier (RAI, Routing AreaIdentity), virtual NRI is different from each NRI in the SGSN pond, each SGSN disposes the special RAI that does not broadcast in system message, can be referred to as non-broadcasting RAI, non-broadcasting RAI is different from broadcasting RAI.Carrying out GPRS when user terminal adheres to or Routing Area Update (RAU, Routing AreaUpdate) time, determine whether the transferring user terminal by SGSN, when SGSN need to determine the transferring user terminal, for the user terminal allocation packet contains the P-TMSI of virtual NRI, SGSN is in the RAU response of returning to user terminal (Routing Area Update Accept) or adhere to the P-TMSI that carries non-RAI of broadcasting and distribution in the response (AttachAccept) then; User terminal after receiving the RAU response or adhering to response compares non-broadcasting RAI that carries in the response and the RAI that self stores, because comparative result is inequality, and Routing Area Update or attachment update that the very fast initiation of user terminal is new; The virtual NRI that the RAN node provides according to user terminal determines that these user terminal needs shift, reselect other SGSN in the SGSN pond as the service SGSN of user terminal for user terminal then, the RAU that user terminal sends asks (Routing Area Update Request) or adheres to request (AttachAccept) is routed to user terminal by the RAN node new service SGSN, after routing update flow process or GPRS attachment flow finished, user terminal was transferred among the new SGSN.Below the former service SGSN of user terminal is called source SGSN, the service SGSN that reselects for user terminal is called target SGSN.
Fig. 1 shows in the prior art transferring user terminal flow chart in the SGSN pond, as shown in Figure 1, with the user terminal be UE, RAN node be RNC, UE to initiate Routing Area Update be example, the implementation procedure that shifts UE in the SGSN pond may further comprise the steps:
Step 101:UE and RNC set up Radio Resource control (RRC, Radio Resource Control) and connect, and RNC is the channel resource that UE distributes and set up air interface.RRC establishment of connection process is followed the regulation of 3GPP standard TS25.331.
Step 102:UE sends initial direct-sending message (INITIAL DIRECTTRANSFER) to RNC, request RNC routes to service SGSN with the non-access layer information (NASMessage) that carries in this initial direct-sending message, and set up Iu with this SGSN and be connected, the RAU request of this non-access layer information parameter after for encapsulation.
After step 103:RNC receives initial direct-sending message, select a SGSN according to the routing parameter that carries in the initial direct-sending message (Routing Parameter), this SGSN is source SGSN.RNC sends initial UE message (INITIAL UE MESSAGE) to source SGSN, and sets up Iu with source SGSN and is connected, carries non-access layer information in this initial UE message, and the RAU of this non-access layer information parameter after for encapsulation asks.
Step 104: after source SGSN receives initial UE message, ask by non-access layer information parameter acquiring RAU, source SGSN determines UE to be transferred to other SGSN in the SGSN pond, maybe need to carry out the certain maintenance operation as source SGSN overload, source SGSN is that UE distributes P-TMSI, and the NRI that comprises among this P-TMSI is the virtual NRI of source SGSN.
Step 105: source SGSN returns the RAU response to UE, carries non-broadcasting RAI and the newly assigned P-TMSI of active SGSN in this RAU response.
After step 106:UE received the RAU response, the P-TMSI that carries in the storage RAU response returned RAU to source SGSN then and finishes message (Routing Area Update Complete), and notification source SGSN has finished Routing Area Update.
Step 107: after source SGSN receives that RAU finishes message, send Iu release command (IU RELEASE COMMAND) to RNC, indication RNC discharges Iu and connects.
After step 108:RNC receives the Iu release command, discharge RRC and connect and its relevant air interface resource, discharge Iu and connect the transfer resource relevant with it.The dispose procedure that RRC connects is followed the regulation of 3GPP standard TS25.331.
Step 109:RRC connection is connected release with Iu after, RNC returns Iu Release complete (IU RELEASE COMPLETE) to source SGSN, and notification source SGSN has discharged Iu and connected.
After step 110:UE receives the RAU response, non-broadcasting RAI that carries in the RAU response and the RAI that self stores are compared, because comparative result is inequality, UE initiates Routing Area Update once more.
Step 111～step 112 is identical with step 101～step 102.
After step 113:RNC receives initial direct-sending message, determine that the routing parameter that carries in the initial direct-sending message is virtual NRI, RNC is that UE selects service SGSN according to the load state of each SGSN in the SGSN pond, and this SGSN is a target SGSN; RNC sends initial UE message to target SGSN then, and sets up Iu with target SGSN and be connected, and carries non-access layer information in this initial UE message, the RAU request of this non-access layer information parameter after for encapsulation.
Step 114: after target SGSN is received initial UE message, ask by non-access layer information parameter acquiring RAU, distribute P-TMSI for UE then and upgrade the routing iinformation of UE, the NRI that comprises among this P-TMSI is the normal NRI of target SGSN, rather than the virtual NRI of target SGSN; Target SGSN is returned the RAU response to UE, carries the RAI and the newly assigned P-TMSI of target SGSN in this RAU response, and this RAI is the RAI that target SGSN can be broadcasted in system message.
After step 115:UE received the RAU response, the P-TMSI that carries in the storage RAU response returned RAU to target SGSN then and finishes message, and notification target SGSN has finished Routing Area Update.
Step 116～step 118: after target SGSN receives that RAU finishes message, send the Iu release command to RNC, indication RNC discharges Iu and connects; After RNC receives the Iu release command, discharge the RRC connection and be connected with Iu, RNC returns the Iu Release complete to target SGSN then, and so far, the Routing Area Update process disposes.
According to above description as seen, in step 110, after user terminal is received the RAU response, non-broadcasting RAI that carries in the RAU response and the RAI that self stores will be compared, this process is the independent behaviour of subscriber terminal side fully, be not subjected to the control of network side, if connecting, Iu do not discharge, then RRC connects still existence, user terminal will come the request to RAN node transmission RAU by up direct-sending message (UPLINKDIRECT TRANSFER) in the step 112, and do not carry parameter N RI in the up direct-sending message, make the RAN node can't determine whether the transferring user terminal, at this moment, exist because Iu connects still, the RAN node is sent to source SGSN with the RAU request by this Iu connection, like this, the new RAU request that user terminal is initiated sends to source SGSN once more, if the problems referred to above repeat always, the Routing Area Update that user terminal is initiated is entered endless loop; Even the problems referred to above no longer repeat, also wasted the transfer resource of network side, and RAN node and source SGSN have carried out useless processing.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of in the SGSN node pool method of transferring user terminal, make the transfer flow of user terminal in the SGSN node pool more perfect.
In order to achieve the above object, the invention provides a kind of in the SGSN node pool method of transferring user terminal, be that each SGSN distributes virtual network resource identification NRI in the SGSN pond, the method includes the steps of:
After A, source SGSN need to determine the transferring user terminal, for user terminal is specified duration, source SGSN provided the virtual NRI of described source SGSN and specifies duration to user terminal;
B, user terminal start timer according to described appointment duration, behind this timer expiry, initiate new update request, and the virtual NRI of described source SGSN is provided to the RAN node;
C, Radio Access Network RAN node are determined needs transferring user terminal according to the virtual NRI of described source SGSN, and user terminal is transferred to target SGSN.
The SGSN of source described in the steps A provides the virtual NRI of described source SGSN and specifies duration to user terminal, for: source SGSN returns to user terminal and upgrades response, carries described virtual NRI and specifies duration in this renewal response.
Described renewal response is: the Routing Area Update response; Or be: adhere to response.
Described step B comprises: user terminal sends renewal to source SGSN and finishes message after receiving virtual NRI and appointment duration, and source SGSN notice RAN node discharges the Iu connection then, and the RAN node discharges the radio resource control RRC connection and is connected with Iu.
Described appointment duration sends to upgrade to source SGSN greater than user terminal finishes message to the time interval between the source SGSN notice RAN node release Iu connection.
Described time interval static configuration is in the SGSN of source.
Update request described in the step B is: the Routing Area Update request; Or be: adhere to request.
According to the proposed method, when source SGSN need to determine the transferring user terminal, for the user terminal allocation packet contains the P-TMSI of virtual NRI, source SGSN carried the P-TMSI of distribution and one and specifies duration in the renewal response of returning to user terminal then; After user terminal is received and upgraded response, start timer according to upgrading the appointment duration that carries in the response, timer then after, user terminal is initiated new update request; The virtual NRI that the RAN node provides according to user terminal determines that these user terminal needs shift, be that target SGSN in the user terminal selecting SGSN pond is as the service SGSN of user terminal then, the update request that user terminal sends is routed to target SGSN by the RAN node, after more new technological process finishes, user terminal is transferred among the new SGSN, make user terminal initiate the time of new Routing Area Update fully by network controls, finish message to the time interval between the source SGSN notice RAN node release Iu connection by making the appointment duration send to upgrade to source SGSN greater than user terminal, guarantee that user terminal can be when the Iu connection discharge, just initiate new Routing Area Update request or adhere to request, the perfect transfer flow of user terminal in the SGSN node pool.
In addition, because the non-broadcasting RAI of SGSN can not be identical with broadcasting RAI, therefore, non-broadcasting RAI has taken the ample resources of RAI, RAI has been caused very big waste, according to the proposed method, need not again to have saved the RAI resource for the non-broadcasting RAI of SGSN configuration.
Description of drawings
Fig. 1 shows in the prior art transferring user terminal flow chart in the SGSN pond;
Fig. 2 shows among the present invention transferring user terminal flow chart in the SGSN pond.
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 accompanying drawing.
Among the present invention, for each SGSN in the SGSN pond distributes virtual NRI, virtual NRI is different from normal N RI in the SGSN pond, when user terminal carries out that GPRS adheres to or during Routing Area Update, determine whether the transferring user terminal by source SGSN, when source SGSN need to determine the transferring user terminal, for the user terminal allocation packet contains the P-TMSI of virtual NRI, source SGSN was in the renewal response of returning to user terminal, as the RAU response or adhere to the P-TMSI that carries distribution in the response and one and specify duration then; User terminal receive upgrade response, as after the RAU response or adhering to response, start timer according to upgrading the appointment duration that carries in the response, timer then after, user terminal initiates new update request, as the RAU request or adhere to request; The virtual NRI that the RAN node provides according to user terminal determines that these user terminal needs shift, be that target SGSN in the user terminal selecting SGSN pond is as the service SGSN of user terminal then, the update request that user terminal sends, as the RAU request or adhere to request and routed to target SGSN by the RAN node, more new technological process, finish as routing update flow process or GPRS attachment flow after, user terminal is transferred among the new SGSN.
Fig. 2 shows among the present invention transferring user terminal flow chart in the SGSN pond, as shown in Figure 2, with the user terminal be UE, RAN node be RNC, UE to initiate Routing Area Update be example, the implementation procedure that shifts UE in the SGSN pond may further comprise the steps:
Step 201～step 203 is identical with step 101～step 103.
Step 204: after source SGSN receives initial UE message, ask by non-access layer information parameter acquiring RAU, source SGSN determines UE to be transferred to other SGSN in the SGSN pond, maybe need to carry out the certain maintenance operation as source SGSN overload, source SGSN is that UE distributes P-TMSI, the NRI that comprises among this P-TMSI is the virtual NRI of source SGSN, and source SGSN is that UE specifies the RAU duration.
Step 205: source SGSN returns the RAU response to UE, carries RAU duration and newly assigned P-TMSI in this RAU response.
Step 206～step 209 is identical with step 106～step 109.
After step 210:UE receives RAU response, start timer according to the RAU duration, timer then after, execution in step 211.
Step 211～step 218 is identical with step 111～step 118.
The time interval between step 206～step 207 is that RNC receives that RAU finishes message to the time interval between the source SGSN initiation Iu connection release, be that user terminal is finished message to the time interval between the source SGSN notice RNC release Iu connection to source SGSN transmission RAU, Iu connects to be connected with RRC and discharges when guaranteeing that UE initiates new Routing Area Update, must make the RAU duration greater than this time interval, can determine the duration in this time interval by statistical method or experience, and can be in SGSN static configuration should the time interval, when SGSN is UE appointment RAU duration, as long as guarantee that the RAU duration is greater than this time interval, like this, UE initiates the time of new Routing Area Update fully by network controls, can not occur in the prior art Iu again and connect when not discharging, UE just initiates the problem of new Routing Area Update.
In the GPRS attachment flow realization of transferring user terminal and RAU more the new technological process transfer to divert from one use to another the realization of family terminal basic identical, difference only is not repeat them here the message that transmits.
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.
Claims (7)
1, a kind of in service universal grouping wireless business supporting node SGSN pond the method for transferring user terminal, it is characterized in that, be that each SGSN distributes virtual network resource identification NRI in the SGSN pond, this method also comprises following steps:
After A, source SGSN need to determine the transferring user terminal, for user terminal is specified duration, source SGSN provided the virtual NRI of described source SGSN and specifies duration to user terminal;
B, user terminal start timer according to described appointment duration, behind this timer expiry, initiate new update request, and the virtual NRI of described source SGSN is provided to the RAN node;
C, Radio Access Network RAN node are determined needs transferring user terminal according to the virtual NRI of described source SGSN, and user terminal is transferred to target SGSN.
2, method according to claim 1, it is characterized in that, the SGSN of source described in the steps A provides the virtual NRI of described source SGSN and specifies duration to user terminal, for: source SGSN returns to user terminal and upgrades response, carries described virtual NRI and specifies duration in this renewal response.
3, method according to claim 2 is characterized in that, described renewal response is: the Routing Area Update response; Or be: adhere to response.
4, method according to claim 1 and 2, it is characterized in that, described step B comprises: after user terminal is received virtual NRI and specified duration, send renewal to source SGSN and finish message, source SGSN notice RAN node discharges the Iu connection then, and the RAN node discharges the radio resource control RRC connection and is connected with Iu.
5, method according to claim 4 is characterized in that, described appointment duration sends to upgrade to source SGSN greater than user terminal finishes message to the time interval between the source SGSN notice RAN node release Iu connection.
6, method according to claim 5 is characterized in that, described time interval static configuration is in the SGSN of source.
7, method according to claim 1 and 2 is characterized in that, update request described in the step B is: the Routing Area Update request; Or be: adhere to request.
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| CNB2005100938200A CN100558196C (en) | 2005-08-30 | 2005-08-30 | The method of transferring user terminal in service universal grouping wireless business supporting node pool |
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| CNB2005100938200A CN100558196C (en) | 2005-08-30 | 2005-08-30 | The method of transferring user terminal in service universal grouping wireless business supporting node pool |
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| CN1925672A CN1925672A (en) | 2007-03-07 |
| CN100558196C true CN100558196C (en) | 2009-11-04 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008128452A1 (en) * | 2007-04-18 | 2008-10-30 | Huawei Technologies Co., Ltd. | The method, system and cn node for load transferring in the pool area |
| CN101184114B (en) * | 2007-10-31 | 2010-06-02 | 中兴通讯股份有限公司 | Method of distributing packet domain temporary mobile subscriber sign |
| CN101562854B (en) * | 2008-04-18 | 2011-11-16 | 电信科学技术研究院 | Method for reselecting serving gateway of user equipment as well as equipment and system thereof |
| US9161381B2 (en) | 2010-01-13 | 2015-10-13 | Lg Electronics Inc. | Communication method in a mobile communication system using MTC equipment, and device for same |
| CN106255092B (en) * | 2012-02-24 | 2020-06-26 | 华为技术有限公司 | Method and device for determining source SGSN |
| WO2014000242A1 (en) * | 2012-06-29 | 2014-01-03 | 华为技术有限公司 | Registration method, sgsn and user equipment |
| CN105517055B (en) * | 2014-09-25 | 2018-11-09 | 南京中兴新软件有限责任公司 | A kind of load auto repartition method of completing the square, apparatus and system |
| CN109710464B (en) * | 2018-12-27 | 2021-02-09 | 杭州宏杉科技股份有限公司 | Consistency group separation method and device |
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