CN100415049C - Handling method for user device transfer between different core network nodes - Google Patents
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- CN100415049C CN100415049C CNB2005100774200A CN200510077420A CN100415049C CN 100415049 C CN100415049 C CN 100415049C CN B2005100774200 A CNB2005100774200 A CN B2005100774200A CN 200510077420 A CN200510077420 A CN 200510077420A CN 100415049 C CN100415049 C CN 100415049C
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Abstract
The present invention discloses a processing method for user equipment to transfer among different core network nodes, which comprises procedures that RRC connection is established by idle state UE and an RNC, Iu connection is established by the RNC and an original CN node, and then, position update is initiated via the RNC; a position update response is returned to the UE by the original CN node, the RNC is instructed to release the Iu connection and maintain the established RRC connection, and the Iu connection is released by the RNC according to the instruction of the original CN node; position update is initiated again by the UE via the RNC, a position update response is returned to the UE by a target CN node and the RNC is instructed to release the Iu connection and the RRC connection. The Iu connection and the RRC connection are released by the RNC according to the indication of the original CN node so that the RNC is free from releasing and reestablishing the RRC connection once in the transfer process of a service CN node of the UE. Thus, the execution efficiency of the transfer of the service CN node of the UE is increased, occupation to a channel resource and a CPU resource is reduced and the channel resource of an air interface and the processing capability of network equipment are saved.
Description
Technical field
The present invention relates to the core network field, be meant the processing method that a kind of subscriber equipment shifts especially between the different core network node.
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 service universal grouping wireless business supporting node (SGSN, Serving GPRS Support Node).
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, subscriber equipment (UE, when User Equipment) in pool area, roaming, for providing the CN node of service, this UE 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.For providing the CN node of service, UE also can be described as service 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 UE 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 UE distributes; P-TMSI is by the CN node of packet domain, is that SGSN is that UE 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 UE entered pool area, service CN node carried the NRI of this service CN node in the TMSI/P-TMSI that distributes for UE.In this pool area, when the Non-Access Stratum (NAS, Non-Access Stratum) that UE is established to the CN node at every turn connected, RNC routed to CN node corresponding to NRI according to NRI with initial NAS message.Like this, can make UE in a pool area, use same CN node.
Comprise circuit domain core network and packet domain core network network in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, circuit domain CN node is MSC, packet domain CN node SGSN, and RNC can connect with MSC and SGSN simultaneously.The access network of WCDMA system logically is divided into lane place (LA, Location Area) and route district (RA, Routing Area), LA is used for circuit domain, RA is used for packet domain, and each lane place is by Location Area Identification (LAI, Location Area Identity) unique identification, each route district is by Routing Area Identifier (RAI, Routing Area Identity) unique identification.Carry the LAI/RAI of this sub-district affiliated area in the system message of Cell Broadcast CB.LAI/RAI is obtained and stored to UE receiving system message
Fig. 1 shows location area updating (LAU, Location Area Update)/Routing Area Update (RAU, Routing Area Update) flow chart, and as shown in Figure 1, the processing procedure of the LAU/RAU of UE 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 direct-sending message (INITIAL DIRECT TRANSFER) to RNC, request RNC routes to the CN node with the non-access layer information (NAS Message) that carries in this direct-sending message, and set up Iu with the CN node and be connected, this non-access layer information is the LAU/RAU request that UE sends to the CN node.
After step 103:RNC receives direct-sending message, according to the CN domain identifier that carries in this direct-sending message (CN Domain ID) parameter, select circuit domain CN node or packet domain CN node, if adopt the CN node pool, then RNC selects the CN node according to the routing parameter that carries in the direct-sending message (Routing Parameter).RNC sends initial UE message (INITIAL UE MESSAGE) to the CN node, and sets up Iu with the CN node and be connected, and carries non-access layer information in this initial UE message.
After step 104:CN node is received initial UE message, ask by non-access layer information parameter acquiring LAU/RAU, the CN node is UE distribution T MSI/P-TMSI in case of necessity, the CN node returns LAU/RAU response to UE then, carries newly assigned TMSI/P-TMSI in this LAU/RAU response and corresponding to this CN node LAI/RAI.
After step 105:UE received the LAU/RAU response, storage TMSI/P-TMSI and LAI/RAI sent LAU/RAU to the CN node then and finish message (LAU/RAU Complete).
After step 106:CN node receives that LAU/RAU finishes message, send Iu release command (IU RELEASE COMMAND) to RNC, indication RNC discharges Iu and connects.
After step 107:RNC receives the Iu release command, discharge the RRC connection and be connected with Iu.
Step 108:RRC connection is connected release with Iu after, RNC returns the Iu Release complete to the CN node, and so far, the LAU/RAU process disposes.
According to above description as seen, when Idle state UE carries out LAU/RAU at every turn, all need to set up the RRC connection and be connected with Iu; After LAU/RAU finishes, correspondingly, need to discharge the RRC connection of setting up and be connected with Iu.
In the CN node pool, each CN node configuration has virtual NRI and non-broadcasting LAI/RAI, and virtual NRI can not be identical with the already used NRI of each CN node in the CN node, the special LAI/RAI of non-broadcasting LAI/RAI for not broadcasting in system message.In the CN node pool, each CN node all disposes the non-broadcasting LAI/RAI of other CN nodes and the corresponding relation between the CN node address.All dispose corresponding relation between the virtual NRI of each CN node in the CN node pool and the CN node address in each RAN node.The CN node address can be CN node global identity (Global CN-ID), IP address or signalling point address
If certain CN node overload in the CN node pool, when the subscriber terminal equipment in this CN node is carried out LAU or RAU, by the RAN node according to each CN node load situation in the CN node pool, subscriber terminal equipment is transferred to the lower CN node of load, makes that the load of each CN node keeps balance in the CN node pool.
Fig. 2 shows UE service CN node transfer flow figure in the prior art, and as shown in Figure 2, the processing procedure that UE service CN node shifts may further comprise the steps:
Step 201:UE sets up RRC with RNC and is connected, 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 202:UE sends direct-sending message to RNC, and request RNC routes to the CN node with the non-access layer information that carries in this direct-sending message, and sets up Iu with the CN node and is connected, and this non-access layer information is that UE asks to the LAU/RAU that the CN node sends.
After step 203:RNC receives direct-sending message, according to the routing parameter that carries in the direct-sending message, be that the NRI of former CN node selects former CN node, send initial UE message to former CN node then, and set up Iu with the CN node and be connected, carry non-access layer information in this initial UE message.
Step 204: after former CN node is received initial UE message, ask by non-access layer information parameter acquiring LAU/RAU, because former CN node overload, UE need be transferred to other CN nodes in the CN node pool, former CN node is UE distribution T MSI/P-TMSI, the virtual NRI that includes former CN node among this TMSI/P-TMSI, former then CN node returns the LAU/RAU response to UE, carries the non-broadcasting LAI/RAI of newly assigned TMSI/P-TMSI and former CN node in this LAU/RAU response.
After step 205:UE received the LAU/RAU response, storage TMSI/P-TMSI and LAI/RAI sent LAU/RAU to former CN node then and finish message.
Step 206: after former CN node receives that LAU/RAU finishes message, send the Iu release command to RNC, indication RNC discharges Iu and connects.
After step 207:RNC receives the Iu release command, discharge the RRC connection and be connected with Iu.
Step 208:RRC connection is connected release with Iu after, RNC returns the Iu Release complete to former CN node.
The LAI/RAI that broadcasts in non-broadcasting LAI/RAI that carries in the LAU/RAU response that step 209:UE determines to store and the system message is inconsistent, and UE initiates the LAU/RAU flow process once more, sets up RRC with RNC and is connected.
Step 210:UE sends direct-sending message to RNC, and request RNC routes to corresponding CN node with the non-access layer information that carries in this direct-sending message, and sets up Iu with corresponding CN node and is connected, and this non-access layer information is that UE asks to the LAU/RAU that corresponding CN node sends.
After step 211:RNC receives direct-sending message, because the routing parameter that carries in the direct-sending message is the virtual NRI of former CN node, therefore, RNC is according to the load state of each CN node in the CN node pool, for UE selects new CN node, is the service CN node of target CN node as UE, RNC sends initial UE message to target CN node then.
Step 212: after target CN node is received initial UE message, ask by non-access layer information parameter acquiring LAU/RAU, target CN node is UE distribution T MSI/P-TMSI, the NRI that includes target CN node among this TMSI/P-TMSI, target CN node returns LAU/RAU response to UE then, carries newly assigned TMSI/P-TMSI in this LAU/RAU response and corresponding to the LAI/RAI of target CN node.
After step 213:UE received the LAU/RAU response, storage TMSI/P-TMSI and LAI/RAI sent LAU/RAU to target CN node then and finish message.
Step 214: after target CN node receives that LAU/RAU finishes message, send the Iu release command to RNC, indication RNC discharges Iu and connects.
After step 215:RNC receives the Iu release command, discharge the RRC connection and be connected with Iu.
Step 216:RRC connection is connected release with Iu after, RNC returns the Iu Release complete to target CN node.
By above description as seen, UE is transferred in the process of target CN node by former CN node, need to set up and discharge twice RRC and be connected, connect in the process of setting up at RRC, need to carry out Signalling exchange between UE and the RNC, and interactive signaling all aloft interface use common signal channel or dedicated channel to transmit, RNC needs the protocol stack between configuration NodeB and the RNC for realizing and the Signalling exchange of UE.In the transfer process of UE service CN node, just need in the short time to discharge and rebuild a RRC and is connected,, will cause waste the channel resource of air interface because the required signaling of the release that RRC connects and reconstruction is all wanted the busy channel resource; Because release that RRC connects and reconstruction need the extra processing time, prolonged the required processing time of transfer process of UE service CN node; Because RRC sets up in the process, RNC, NodeB need and take Radio Resource for the UE distribution, and this need take the resource of the central processing unit (CPU, Central Processing Unit) of the network equipment, and the disposal ability of the network equipment is consumed.Therefore, in sum, the execution efficient that existing UE service CN node shifts is lower.
Summary of the invention
In view of this, the processing method that the object of the present invention is to provide a kind of subscriber equipment to shift between the different core network node improves the execution efficient that UE service CN node shifts.
In order to achieve the above object, the invention provides the processing method that a kind of subscriber equipment shifts between the different core network node, the method includes the steps of:
A, Idle state user equipment (UE) are set up radio resource control RRC with radio network controller (RNC) and are connected, and RNC sets up Iu with former core network C N node and is connected, and initiate the position by RNC then and upgrade;
B, former CN node upgrade response to the UE home position, and indication RNC discharges the Iu connection and keep the RRC that sets up to connect, and RNC discharges the Iu connection according to the indication of former CN node;
C, UE initiate the position once more by RNC and upgrade, target CN node upgrades response to the UE home position, and indication RNC discharges that Iu connects and RRC connects, and RNC discharges according to the indication of target CN node that RRC connects and UE initiates the position once more by RNC and upgrades the Iu that sets up the back and connect.
Keep the indication of the RRC connection of foundation to be carried at former CN node in the Iu release command that RNC sends described in the step B.
The RRC that described maintenance is set up connects is designated as the cause value that increases in the cause value parameter in described Iu release command.
What the RRC that described maintenance is set up connected is designated as: service CN node shifts, or is: load heavily distributes.
The non-broadcast location sign that carries former CN node in the response is upgraded in position described in the step B; It is to determine inconsistent realization of station location marker of broadcasting in the non-broadcast identification received and the system message by: UE that UE described in the step C initiates once more by RNC that the position upgrades.
UE described in the step C initiates the position once more by RNC and upgrades, and upgrades response with target CN node to the UE home position, between further comprise: RNC determines the service CN node of target CN node as UE.
According to the proposed method, in UE service CN node transfer process, only set up and discharge a RRC and be connected, be that former CN node indication RNC is when discharging Iu and connect, indication RNC keeps RRC to connect, like this, RNC can keep the RRC that has set up to connect, just can not serve and discharge in the CN node transfer process and rebuild a RRC and be connected at UE, improved the execution efficient that UE service CN node shifts, reduced the taking of channel resource and cpu resource, saved the disposal ability of the channel resource and the network equipment of air interface.In addition, because RNC only sets up and discharges a RRC and is connected among the present invention, shortened the required processing time of transfer process that UE serves the CN node.
Description of drawings
Fig. 1 shows location area and upgrades flow chart;
Fig. 2 shows UE service CN node transfer flow figure in the prior art;
Fig. 3 shows UE service CN node transfer flow figure 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 accompanying drawing.
Among the present invention, in UE service CN node transfer process, only set up and discharge a RRC and be connected, be former CN node indication RNC when discharging Iu and connect, indication RNC keeps RRC to connect, like this, RNC can keep the RRC that has set up to connect, just can not serve and discharge in the CN node transfer process and rebuild a RRC and is connected, improve the execution efficient of UE service CN node transfer, reduce taking channel resource and cpu resource at UE.
Fig. 3 shows UE service CN node transfer flow figure among the present invention, and as shown in Figure 3, the processing procedure that UE service CN node shifts may further comprise the steps:
Step 301:UE sets up RRC with RNC and is connected, 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 302:UE sends direct-sending message to RNC, and request RNC routes to the CN node with the non-access layer information that carries in this direct-sending message, and sets up Iu with the CN node and is connected, and this non-access layer information is that UE asks to the LAU/RAU that the CN node sends.
After step 303:RNC receives direct-sending message, according to the routing parameter that carries in the direct-sending message, be that the NRI of former CN node selects former CN node, send initial UE message to former CN node then, and set up Iu with the CN node and be connected, carry non-access layer information in this initial UE message.
Step 304: after former CN node is received initial UE message, ask by non-access layer information parameter acquiring LAU/RAU, because former CN node overload, UE need be transferred to other CN nodes in the CN node pool, former CN node is UE distribution T MSI/P-TMSI, the virtual NRI that includes former CN node among this TMSI/P-TMSI, former then CN node returns the LAU/RAU response to UE, carries the non-broadcasting LAI/RAI of newly assigned TMSI/P-TMSI and former CN node in this LAU/RAU response.
After step 305:UE received the LAU/RAU response, storage TMSI/P-TMSI and LAI/RAI sent LAU/RAU to former CN node then and finish message.
Step 306: after former CN node receives that LAU/RAU finishes message, send the Iu release command to RNC, indication RNC discharges Iu and connects; Carry RRC in this Iu release command and connect the maintenance indication, indication RNC keeps the RRC that has set up to connect.RRC connect to keep indication to realize by increase new cause value in the cause value parameter of Iu release command, and this RRC connects and keeps indication to can be that service CN node shifts, load heavily distributes etc.
After step 307:RNC receives the Iu release command, discharge Iu and connect, and keep the RRC that has set up to connect, no longer connection discharges to RRC.After Iu connected release, RNC returned the Iu Release complete to former CN node.
The LAI/RAI that broadcasts in non-broadcasting LAI/RAI that carries in the LAU/RAU response that step 308:UE determines to store and the system message is inconsistent, UE initiates LAU/RAU once more, send direct-sending message to RNC, request RNC routes to corresponding CN node with the non-access layer information that carries in this direct-sending message, and set up Iu with corresponding CN node and be connected, this non-access layer information is the LAU/RAU request that UE sends to corresponding CN node.
After step 309:RNC receives direct-sending message, because the routing parameter that carries in the direct-sending message is the virtual NRI of former CN node, therefore, RNC is according to the load state of each CN node in the CN node pool, for UE selects new CN node, is the service CN node of target CN node as UE, RNC sends initial UE message to target CN node then.
Step 310: after target CN node is received initial UE message, ask by non-access layer information parameter acquiring LAU/RAU, target CN node is UE distribution T MSI/P-TMSI, the NRI that includes target CN node among this TMSI/P-TMSI, target CN node returns LAU/RAU response to UE then, carries newly assigned TMSI/P-TMSI in this LAU/RAU response and corresponding to the LAI/RAI of target CN node.
After step 311:UE received the LAU/RAU response, storage TMSI/P-TMSI and LAI/RAI sent LAU/RAU to target CN node then and finish message.
Step 312: after target CN node receives that LAU/RAU finishes message, send the Iu release command to RNC, indication RNC discharges Iu and connects.
After step 313:RNC receives the Iu release command, discharge the RRC connection and be connected with Iu.
Step 314:RRC connection is connected release with Iu after, RNC returns the Iu Release complete to target CN node.
Below only being that the UE service CN node transfer process of UE select target CN node is an example by RNC, the UE service CN node transfer process that the present invention is proposed is described, it is the UE service CN node transfer process of UE select target CN node that the present invention is equally applicable to by former CN node, the present invention is also applicable to other former thereby UE service CN node transfer processes of causing of CN node load no thanks to, all be that indication RNC keeps the RRC that has set up to connect when former CN node indication RNC discharges the Iu connection.
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 (6)
1. method that subscriber equipment shifts between the different core network node is characterized in that the method includes the steps of:
A, Idle state user equipment (UE) are set up radio resource control RRC with radio network controller (RNC) and are connected, and RNC sets up Iu with former core network C N node and is connected, and initiate the position by RNC then and upgrade;
B, former CN node upgrade response to the UE home position, and indication RNC discharges the Iu connection and keep the RRC that sets up to connect, and RNC discharges the Iu connection according to the indication of former CN node;
C, UE initiate the position once more by RNC and upgrade, target CN node upgrades response to the UE home position, and indication RNC discharges that Iu connects and RRC connects, and RNC discharges according to the indication of target CN node that RRC connects and UE initiates the position once more by RNC and upgrades the Iu that sets up the back and connect.
2. method according to claim 1 is characterized in that, keeps the indication of the RRC connection of foundation to be carried at former CN node in the Iu release command that RNC sends described in the step B.
3. method according to claim 2 is characterized in that, the RRC that described maintenance is set up connects is designated as the cause value that increases in the cause value parameter in described Iu release command.
4. according to claim 2 or 3 described methods, it is characterized in that what the RRC that described maintenance is set up connected is designated as: service CN node shifts, or is: load heavily distributes.
5. method according to claim 1 is characterized in that,
The non-broadcast location sign that carries former CN node in the response is upgraded in position described in the step B;
It is to determine inconsistent realization of station location marker of broadcasting in the non-broadcast identification received and the system message by: UE that UE described in the step C initiates once more by RNC that the position upgrades.
6. according to claim 1,2 or 5 described methods, it is characterized in that, UE described in the step C initiates the position once more by RNC and upgrades, and upgrades response with target CN node to the UE home position, between further comprise: RNC determines the service CN node of target CN node as UE.
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| CN101267587B (en) * | 2007-03-12 | 2012-10-31 | 电信科学技术研究院 | A method, device and system for realizing load reallocation |
| CN101309508B (en) * | 2007-05-18 | 2015-05-13 | 中兴通讯股份有限公司 | Method implementing location updating and calling of mobile terminal |
| CN101312571B (en) * | 2007-05-24 | 2011-04-20 | 中兴通讯股份有限公司 | Method for idle terminal to update location thereof after movement across wireless control point |
| CN101959270B (en) * | 2010-11-01 | 2013-12-18 | 华为技术有限公司 | Core network node switching method, equipment and system for user equipment (UE) |
| CN109963332A (en) * | 2017-12-26 | 2019-07-02 | 华为技术有限公司 | Location area updating compatibility method, equipment of the core network and net control device |
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