CN101674628A - Route reselection method and radio network controller - Google Patents

Route reselection method and radio network controller Download PDF

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Publication number
CN101674628A
CN101674628A CN200910190698A CN200910190698A CN101674628A CN 101674628 A CN101674628 A CN 101674628A CN 200910190698 A CN200910190698 A CN 200910190698A CN 200910190698 A CN200910190698 A CN 200910190698A CN 101674628 A CN101674628 A CN 101674628A
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rnc
msc
route reselection
plmn
information
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刘强生
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ZTE Corp
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Priority to PCT/CN2010/072931 priority patent/WO2010145388A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0066Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/10Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12Access point controller devices

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a route reselection method and a radio network controller. The method is applied in a multi-operator core network, when the radio network controller, that is the RNC receives an initial direct transfer message sent by a user device, a mobile switching center, that is the MSC is selected for carrying out route reselection. When the RNC decodes a non-access layer message in the initial direct transfer message and a position updating request message is obtained, the RNC obtains a core network operator identifier carried in the position updating request message, that is PLMN-ID information; and the RNC selects the MSC for carrying out the first route reselection according to the PLMN-ID information and the corresponding relationship between the PLMN-ID and the MSC configured in the RNC. The use of the method can ensure the consistency of operators of the core network selected for UE and the operators of the core network for serving the UE during the last position updating before roaming of the UE, and improve the success probability of the first route reselection.

Description

Route reselection method and radio network controller
Technical field
The present invention relates to wireless communication field, relate in particular to the method and apparatus of selecting mobile switching centre when carrying out route reselection in the MOCN.
Background technology
Network technology of sharing in the 3G Wideband Code Division Multiple Access (WCDMA) (WCDMA) is meant and allows to share between the heterogeneous networks operator WCDMA part network element.The current multiple network solution scheme shared that exists, wherein have a kind of important network sharing mode to be: each operator builds independently core net respectively, but shares wireless access network (RAN) and frequency range.This network sharing mode relates to Iu-Flex technology and MOCN (Multi-Operator Core Network, the MOCN) networking mode in the 3GPP agreement.
The introducing of Iu-Flex technology has broken that radio network controller (RNC) can only be by the relation of a core net node mobile switching centre (MSC) control in the past, and a RNC can insert a plurality of MSC, and these a plurality of MSC can form a pond, be called MSC POOL.The wireless zone of all RNC administrations becomes the coverage of MSC POOL under this MSC POOL.Concrete networking schematic diagram as shown in Figure 1.
When subscriber equipment (UE) roams into the coverage of MSC POOL first, can initiate position updating process, RNC then can be according to specific principle (as load balancing), for UE distributes a MSC.This MSC then can distribute a temporary mark TMSI to UE when position updating process is finished, can comprise the distinctive network resource identifier of this MSC (NRI) in TMSI.Follow-up UE can use the TMSI that contains NRI to initiate position renewal or service access process, and this moment, RNC then can find the MSC of the previous service of UE for this reason according to NRI.
On the basis of Iu-Flex technology, the MOCN networking mode is arranged again, promptly different MSC is connected to same RNC, and MSC is respectively by the networking mode of different operators operation.For the wireless zone of sharing, RNC need comprise sign (PLMN-ID) tabulation of service available core network operators in broadcast message.When UE roams into shared wireless zone, UE for the network enabled sharing functionality, can learn the core network operators tabulation that service is provided by radio broadcasting, and on the UE interface, present to the user, select concrete core network operators by the user, and in the follow-up message that sends to network side, carry the PLMN-ID of this operator; But for the UE of network enabled sharing functionality not, owing to can't discern the identification list of the core network operators in the radio broadcasting, the user can't oneself select core network operators, and at this moment RNC then needs to attempt selecting core network operators for the user by route reselection (Reroute) process that defines in the agreement.The route reselection process specifically describes as follows as shown in Figure 2:
When UE roamed into the shared network wireless zone, UE found that the Location Area Identification in the broadcast message changes, and the position of needs initiation at this moment more new technological process re-registers, and the technical scheme key step that existing protocol provides is as follows:
201, UE and RNC set up wireless connections.
202, UE sends initial direct-sending (Initial Direct Transfer) message and gives RNC.
203, RNC receives the Initial Direct Transfer message that UE sends, if RNC can obtain NRI in this message, and can find corresponding MSC by NRI; Perhaps carried the PLMN-ID that UE selects in the message, RNC can find MSC according to PLMN-ID, need not to carry out the Reroute process this moment.When RNC can't determine MSC, then need to carry out the Reroute process, it selects the method for MSC is picked at random MSC, as MSCA, carries route reselection then and attempt sign (redirect attempt flag) in sending to the Initial UE message of MSCA.
206, after MSCA receives Initial UE message, need obtain user's permanent identification (IMSI) so that determine this user and in this operator, whether permit roaming (mode of obtaining UE IMSI can be carried out according to the mode that defines in the agreement).If the operator of this MSCA ownership does not allow this user's roaming, then user network adheres to and can fail.
207, carried under the situation of redirect attempt flag in Initial UE message, MSC needs to carry route reselection instruction (Reroute Command) information in sending to the message of RNC, require RNC to reselect MSC, and need carry initial Non-Access Stratum (NAS) information of carrying in the Initial UE message and the user ID IMSI that has obtained.
208, RNC reselects the MSC of a non-selected mistake, as MSCB, carries redirect attempt flag, initial Non-Access Stratum information and user ID IMSI in sending to the Initial UE message of this node.
Subsequent step is the prior art flow process, and is irrelevant with the present invention, repeats no more.
As seen, according to the technical scheme that provides in the existing protocol, the method for selecting MSC in the route reselection process is one of a random choose in the MSC that did not also select.The system of selection meeting of this blindness of prior art causes following defective to occur:
If it is a plurality of that the operator of core net has, a UE position updating process may cause RNC to reselect MSC many times, consuming time oversize, may cause the UE position updating process to be failed, and may cause the load of RNC to raise because of overtime, very big to the performance impact of RNC.
Be the weak point in the resolution protocol, have patent file to propose on RNC, to dispose the corresponding relation of IMSI section and MSC, and when RNC has obtained user's IMSI in the route reselection process after, determine message is sent to specific MSC according to configuration information.This mode can be alleviated the defective of reuse adoption process in the agreement to a certain extent, but still following defective is arranged:
1. when RNC carried out route reselection selection MSC first, this moment, RNC did not generally know the IMSI of UE.Be still for the first time and select MSC at random, if failure for the first time, then, just can obtain user IMSI from the MSC that selects first in second time during the route reselection process.Therefore this patent is not improved the situation of the failure of route reselection first that may occur in the step 206.
2. select MSC according to the IMSI allocation list, RNC is the consistency of the core network operators of UE service in the time of can't guaranteeing to the core network operators of UE selection and the renewal of the last position of UE.
Summary of the invention
Technical problem to be solved by this invention is, route reselection method is provided, make when RNC carries out first route reselection that the core network operators of selecting for UE is that the UE core network operators of serving is consistent when upgrading with the last position of UE, and improves route reselection probability of successful first.
The present invention also provides the RNC of route reselection, makes when RNC carries out first route reselection, and the core network operators of selecting for UE is that the UE core network operators of serving is consistent when upgrading with the last position of UE, and improves route reselection probability of successful first.
For solving the problems of the technologies described above, the present invention proposes route reselection method, work as radio network controller, be that RNC receives the initial direct-sending that subscriber equipment sends, promptly during Initial Direct Transfer message, select mobile switching centre, be that MSC carries out route reselection, wherein:
Non-access layer information in described RNC decodes described Initial Direct Transfer message, obtain position updating request, when being Location updating request message, described RNC obtains the core network operators sign of carrying in the described Location updating request message, i.e. PLMN-ID information;
Described RNC is according to described PLMN-ID information, and PLMN-ID that is disposed among the described RNC and the corresponding relation of MSC, selects MSC to carry out route reselection first.
Preferably, when described RNC obtains in initial direct-sending message less than network resource identifier, i.e. NRI, when perhaps can't find corresponding MSC by NRI, described RNC carries out the decoding of non-access layer information.
Preferably, also comprise step after described RNC decoding, when not being Location updating request message as if the described non-access layer information through decoding, described RNC selects MSC to carry out route reselection first arbitrarily.
Preferably, described RNC is in order to judge whether described non-access layer information is the decoding that Location updatingrequest message is carried out, the header information in the described non-access layer information of only decoding.
Preferably, when described PLMN-ID in described corresponding relation during corresponding a plurality of MSC, described RNC selects MSC to carry out route reselection first according to the weight load sharing principle of configuration.
Preferably, in described corresponding relation, when not disposing the pairing MSC of described PLMN-ID, described RNC selects MSC to carry out route reselection first arbitrarily.
The invention allows for the RNC of route reselection, comprise module:
Decoder module, be used for the initial direct-sending message that described RNC receives is decoded, when the non-access layer information that obtains when decoding was Location updating request message, described decoder module sent to information module with described Location updating request message;
Information module is used for obtaining the core network operators sign that described Location updating request message is carried, and promptly PLMN-ID information sends to the selection module with described PLMN-ID information;
Select module, be used for the described PLMN-ID that sends according to information module, and the PLMN-ID of configuration and the corresponding relation of MSC, selection MSC carries out route reselection first.
Preferably, when described RNC obtains in initial direct-sending message less than network resource identifier, i.e. NRI, when perhaps can't find corresponding MSC by NRI, described decoder module carries out the decoding of non-access layer information.
Preferably, when decoder module judged that described non-access layer information that decoding obtains is for Locationupdating request message, described decoder module notified described selection module to select any MSC to carry out route reselection first.
Preferably, the described decoder module header information in the non-access layer information of only decoding.
Preferably, when having a plurality of MSC corresponding to same PLMN-ID in the described corresponding relation, described selection module selects MSC to carry out route reselection first according to the weight load sharing principle of configuration.
Preferably, in described corresponding relation, during the pairing MSC of the described PLMN-ID that does not have the configuration information module to send, described selection module selects MSC to carry out route reselection first arbitrarily.
The present invention decodes to Initial Direct Transfer message by RNC, obtains non-access layer information.When RNC judges that obtaining this non-access layer information is position updating request (Location updatingrequest) message, the sign PLMN-ID of operator that serves for this UE before the described message acquisition of the continuation decoding UE initiation Location updating request message.According to the corresponding relation of PLMN-ID that is provided with among the RNC and MSC, select the MSC among the described PLMN-ID again, carry out route reselection first.
By method provided by the invention, guaranteed that core network operators and the UE roaming selected for UE are the consistency of the core network operators of UE service when the position is upgraded for the last time before.And the MSC of method selection belongs to the operator that uses before the roaming thus, and this operator supports that the probability of UE is higher, has reduced the probability of failure of the route reselection first that may occur in the background technology step 206.
Description of drawings
Figure l is a MSC POOL networking structure schematic diagram in the prior art.
Fig. 2 is the schematic flow sheet of prior art route reselection process.
Fig. 3 is the schematic flow sheet of the route reselection process of the inventive method.
Fig. 4 is the route reselection process steps flow chart of the inventive method.
Fig. 5 is the structural representation of apparatus of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
When UE roamed into the shared network wireless zone, UE found that the Location Area Identification in the broadcast message changes, and the position of needs initiation at this moment more new technological process re-registers.The inventive method applies to this position more in the new technological process, and main process as shown in Figure 3.
301, UE and RNC set up wireless connections
302, UE sends Initial Direct Transfer message to RNC.
If RNC can't obtain to obtain NRI in message, perhaps obtained but can not find corresponding MSC, and also do not carried the PLMN-ID that UE selects in the message, then RNC can't determine MSC, needs to select MSC carry out route reselection first.
303, RNC decodes to Initial Direct Transfer message, and the non-access layer information that obtains is when RNC judges that obtaining this non-access layer information is Location updating request message
304, RNC continues decoding, obtains band of position distinguishing mark, i.e. LAI from described Location updating request message; And include the core network operators sign of using before the described UE roaming among the LAI again, i.e. PLMN-ID information.This PLMN-ID is operator's sign of serving for this UE before UE initiates Locationupdating request message.
305, according to the PLMN-ID message that inquires, and PLMN-ID that is disposed among the described RNC and the corresponding relation of MSC, RNC selects MSC to begin follow-up route reselection process.
Such method can find this UE to roam the operator that uses before, thereby has guaranteed that core network operators and the UE roaming selected for UE are the consistency of the core network operators of UE service when the position is upgraded for the last time before.And the MSC of method selection belongs to the operator that uses before the roaming thus, and this operator supports that the probability of UE is higher, has reduced the probability of failure of the route reselection first that may occur in the background technology step 206.
Detailed process as shown in Figure 4, wherein the present invention's key step of being correlated with is described below:
406, RNC need judge whether non-access layer information is Location updating request message.If non-access layer information is not a Location updating request message, then need select MSC to carry out route reselection first according to the route reselection process in the prior art scheme.
Generally speaking, when the roaming in cross-location district has taken place UE, Location updating request is first the non-access layer information that this UE sends under the reposition district.Therefore preferably, RNC does not need the cell in all non-access layer informations is all decoded, and header information gets final product in the non-access layer information of only decoding.The header information of non-access layer information is made up of 2 bytes, under the definition as shown in Table 1:
Table one non-access layer information header information content
Figure G2009101906987D00081
According to agreement, if Protocol discriminator equals 5 (mobility managementmessages), and Message Type equals 8 (Location updating request), and whether then can judge is Location updating request.
If non-access layer information is not Location updating request, then need select MSC according to the route reselection process in the prior art scheme, perhaps use other prior aries to select MSC to carry out route reselection first.
If 407 non-access layer informations are Location updating request, then RNC need further obtain the PLMN-ID information in this message, particularly:
RNC need continue to decode and obtain the Location Area Identification field (LAI, LocationArea identification) that comprises in this message.The LAI field is positioned at the 4th~8 byte of Location updating request message, as shown in Table 2.RNC can leap to 4~8 bytes and obtain LAI.
Table two Location updating request message content
The LAI of RNC by obtaining obtains PLMN-ID.This PLMN-ID is operator's sign of serving for this UE before UE initiates Location updating request message.The composition of LAI as shown in Table 3, wherein PLMN-ID equals MCC digit 1+MCC digit 2+MCC digit 3+MNC digit 1+MNC digit 2+MNC digit 3.
Table three LAI content
Figure G2009101906987D00101
By such method, then can initiate the sign PLMN-ID of operator that Location updatingrequest message is served for this UE before so that RNC gets access to UE.
408, described RNC is according to described PLMN-ID information, and PLMN-ID that is disposed among the described RNC and the corresponding relation of MSC, selects MSC to carry out route reselection first.
On RNC, set up the corresponding relation of PLMN-ID and MSC,, write down the corresponding relation of all MSC that are connected with this RNC and affiliated operator according to the composition of existing network.Preferably, this corresponding relation can be provided with as shown in Table 4.The situation that the corresponding a plurality of MSC of an operator wherein may occur, use weight to represent the capacity of a plurality of MSC, disposal ability etc. this moment.When the PLMN-ID correspondence of obtaining from Location updatingrequest message a plurality of MSC, select MSC to carry out route reselection first according to the principle of the weight load sharing that disposes.The principle of described weight load sharing is a prior art, does not repeat them here.
The corresponding relation of table four service provider and MSC
Figure G2009101906987D00102
If when RNC can't find the MSC corresponding with the PLMN-ID that obtains from Location updating request message, then carry out route reselection first according to prior art Scheme Choice MSC.
The present invention also provides the RNC of route reselection, as shown in Figure 5.This device is arranged in RNC, comprising:
Decoder module, be used for the initial direct-sending message that described RNC receives is decoded, when the non-access layer information that obtains when decoding was Location updating request message, described decoder module sent to information module with described Location updating request message;
Information module is used for obtaining the core network operators sign that described Location updating request message is carried, and promptly PLMN-ID information sends to the selection module with described PLMN-ID information;
Select module, be used for the described PLMN-ID that sends according to information module, and the PLMN-ID of configuration and the corresponding relation of MSC, selection MSC carries out route reselection first.
When UE roamed into the shared network wireless zone, UE found that the Location Area Identification in the broadcast message changes, and the position of needs initiation at this moment more new technological process re-registers.Apparatus of the present invention apply to this position more in the new technological process process as follows:
UE and RNC set up wireless connections and send Initial Direct Transfer message to RNC.If RNC can't obtain to obtain NRI in message, perhaps obtained but can not find corresponding MSC, and also do not carried the PLMN-ID that UE selects in the message, then RNC can't determine MSC, needs to select MSC carry out route reselection first.
Described decoder module among the RNC is decoded to Initial Direct Transfer message, and the non-access layer information that obtains, decoder module need judge whether non-access layer information is Location updatingrequest message.If non-access layer information is not a Location updating request message, then need select MSC to carry out route reselection first according to the route reselection process in the prior art scheme.If non-access layer information is Location updating request, then decoder module sends to described information module with Location updatingrequest message.
Described information module further obtains the PLMN-ID information in the described Location updating request message, and detailed process is referring to method step 407.By such method, then information module can get access to UE and initiate the sign PLMN-ID of operator that Location updating request message is served for this UE before.Information module sends to described selection module with described PLMN-ID.
Described selection module is according to described PLMN-ID information, and the corresponding relation of PLMN-ID that is disposed and MSC, selects MSC to carry out route reselection first, and detailed process is referring to method step 408.
Cross correlation by these modules, make RNC identify PLMN-ID by the operator that UE initiates to serve for this UE before the Location updatingrequest message, and, select MSC to carry out route reselection first by the PLMN-ID that disposes among the RNC and the relation between the MSC.Such method can find this UE to roam the operator that uses before, thereby has guaranteed that core network operators and the UE roaming selected for UE are the consistency of the core network operators of UE service when the position is upgraded for the last time before.And the MSC of method selection belongs to the operator that uses before the roaming thus, and this operator supports that the probability of UE is higher, has reduced the probability of failure of the route reselection first that may occur in the background technology step 206.
Need to prove that described device embodiment is corresponding with described method embodiment respectively, the description of therefore installing the part reference method embodiment relevant portion that the embodiment part do not describe in detail gets final product.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1, route reselection method is applied to MOCN, works as radio network controller, be that RNC receives the initial direct-sending that subscriber equipment sends, promptly during Initial Direct Transfer message, select mobile switching centre, be that MSC carries out route reselection, it is characterized in that
Non-access layer information in described RNC decodes described Initial Direct Transfer message, obtain position updating request, when being Location updating request message, described RNC obtains the core network operators sign of carrying in the described Location updating request message, i.e. PLMN-ID information;
Described RNC is according to described PLMN-ID information, and PLMN-ID that is disposed among the described RNC and the corresponding relation of MSC, selects MSC to carry out route reselection first.
2, route reselection method as claimed in claim 1, it is characterized in that, when described RNC obtains in initial direct-sending message less than network resource identifier, i.e. NRI, when perhaps can't find corresponding MSC by NRI, described RNC carries out the decoding of non-access layer information.
3, route reselection method as claimed in claim 1, it is characterized in that, also comprise step after described RNC decoding, when not being Location updatingrequest message as if the described non-access layer information through decoding, described RNC selects MSC to carry out route reselection first arbitrarily.
4, as route reselection method as described in any in the claim 1 to 3, it is characterized in that, described RNC is in order to judge whether described non-access layer information is the decoding that Location updating request message is carried out, the header information in the described non-access layer information of only decoding.
5, route reselection method as claimed in claim 1 is characterized in that, when described PLMN-ID in described corresponding relation during corresponding a plurality of MSC, described RNC selects MSC to carry out route reselection first according to the weight load sharing principle of configuration.
6, route reselection method as claimed in claim 1 is characterized in that, in described corresponding relation, when not disposing the pairing MSC of described PLMN-ID, described RNC selects MSC to carry out route reselection first arbitrarily.
7, the RNC of route reselection is characterized in that, comprises module:
Decoder module, be used for the initial direct-sending message that described RNC receives is decoded, when the non-access layer information that obtains when decoding was Location updating request message, described decoder module sent to information module with described Location updating request message;
Information module is used for obtaining the core network operators sign that described Location updating request message is carried, and promptly PLMN-ID information sends to the selection module with described PLMN-ID information;
Select module, be used for the described PLMN-ID that sends according to information module, and the PLMN-ID of configuration and the corresponding relation of MSC, selection MSC carries out route reselection first.
8, the RNC of route reselection as claimed in claim 7, it is characterized in that, when described RNC obtains in initial direct-sending message less than network resource identifier, i.e. NRI, when perhaps can't find corresponding MSC by NRI, described decoder module carries out the decoding of non-access layer information.
9, the RNC of route reselection as claimed in claim 7, it is characterized in that, when decoder module judged that described non-access layer information that decoding obtains is for Location updating request message, described decoder module notified described selection module to select any MSC to carry out route reselection first.
10, as the RNC of any described route reselection in the claim 7 to 9, it is characterized in that the described decoder module header information in the non-access layer information of only decoding.
11, the RNC of route reselection as claimed in claim 7 is characterized in that, when having a plurality of MSC corresponding to same PLMN-ID in the described corresponding relation, described selection module selects MSC to carry out route reselection first according to the weight load sharing principle of configuration.
12, the RNC of route reselection as claimed in claim 7 is characterized in that, in described corresponding relation, during the pairing MSC of the described PLMN-ID that does not have the configuration information module to send, described selection module selects MSC to carry out route reselection first arbitrarily.
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