CN101227742A - Method for implementing roam in wireless local loop system - Google Patents

Abstract

The invention discloses a method for achieving nomadism in a wireless local loop system, and the method comprises first, a mobile terminal (MS) roams to an access base station controller (BSC) service area, the access BSC receives the position registration information of MS, second, the current access BSC where MS is located transmits position registration information to the attaching BSC of MS, third, the attaching BSC sends position registration accept confirmation information for MS through visiting BSC after the attaching BSC judges right for MS. The process for MS to achieve roaming function is simplified through adopting the method, and meanwhile, networking complexity of a wireless local loop system is lowered.

Description

Realize the method for roaming in a kind of wireless local loop system

Technical field

The present invention relates to wireless local loop (WLL) technology in the communication system, relate in particular to the method that realizes roaming in a kind of wireless local loop system.

Background technology

WLL is a kind of with traditional optical cable or the twisted-pair feeder of wireless transmission method replacement, connects the wireless access technology of user and PSTN (PSTN).The WLL system claims wireless fixed access system again, usually be applied to not possess the place of setting up communications optical cable or cable condition, as the remote districts of some complicated topographical conditions, can provide a kind of economic, practical wireless communication system access scheme by using the WLL system.

Fig. 1 is the networking structure schematic diagram of existing WLL system, this system is mainly formed by local switch (LE) with by the base station sub-system that wireless base station (BS) and base station controller (BSC) thereof constitute, LE inserts the PSTN network, is connected by the V5 interface between each BSC and the LE.Wherein, base station sub-system also comprises the base station transceiver (BTS) that is positioned at BS inside.

The maximum characteristics of WLL system are to have moved on to upward realization of BSC with going up the partial function of realizing in mobile switching centre (MSC) originally, as mobile management.Usually, the BSC of storage user's original portable terminal (MS) data message is the ownership BSC of this MS, and remaining BSC is the visit BSC of this MS.

The network construction characteristic of WLL system has determined portable terminal to insert LE by ownership BSC could realize basic communication function; When MS is in when calling out under the visit BSC service area, the calling of described MS and call request is inserted LE further handle because visit BSC can not transfer is so can't finish calling procedure.Therefore, be necessary to develop a kind of method that can realize that MS communicates in by ownership BSC and the visit network that BSC formed,, realize that the user uses every communication service in WLL system service coverage promptly by the mode of roaming.

Realize the technology of MS roaming in the relevant WLL system, number of patent application is to disclose a kind of implementation in the file of CN200610168015.4, specifically: Radio Access Controller (RAC) accepts to roam into the position register request of the MS of self service area, if inquiring this MS record does not exist, then write down this MS information, and to next generation network (NGN) switch request location registers; The NGN switch is MS distribution roaming phone number and the Smart Home Location Register (SHLR) that sends to the NGN exchanger side; SHLR refreshes this MS record that self preserves; Behind the response message that receives the SHLR loopback, the NGN switch sends to RAC with the roaming phone number that distributes, thereby finishes the roam registration process.Be not difficult to find out that from the technical scheme of this patent application the location registration of MS is that the SHLR by RAC visit NGN exchanger side finishes, and also needs the participation of NGN switch in the enrollment process, and need be that MS distributes the roaming phone number by the NGN switch; And this scheme need be newly established the SHLR network element, and revises the standard interface between NGN and SHLR, could realize the intercommunication between different RAC of MS position register information, thereby, realize that the process of MS roaming function is very complicated; In addition, this scheme must could realize that RAC docks with the NGN switch of different vendor, so versatility is not high by revising the standard V5 interface between RAC and the NGN switch.So 1, utilizing this scheme to set up the WLL system will increase the complexity of networking greatly, be unfavorable for reducing the cost of networking.

Publication number is that the patent application of CN1527521A discloses a kind of method of calling out that realizes inserting between the base station controller in wireless local loop, this method is by the A3/A7 interface between the BSC of expansion CDMA, make access calling and corresponding call process between its support BSC, but use this method to rise to exhale and paging in, the user need take two channels on the BSC, but also it is need be configure user data among each BSC in the network, thereby bigger to taking of Internet resources.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method that realizes roaming in a kind of wireless local loop system, and this method can make MS realize that roaming function becomes more convenient under the situation that does not increase system hardware, simultaneously, can effectively reduce the complexity of WLL system group network.

For achieving the above object, technical scheme of the present invention is achieved in that

Realize the method for roaming in a kind of wireless local loop WLL system, in the original user data information of home base station controller BSC side memory mobile terminal MS, this method comprises:

A, visit base station controller BSC receive the location registers message of the MS roam into self service area;

The visit BSC at b, the current place of MS transmits location registers message to the ownership BSC of described MS;

C, described ownership BSC carry out authentication according to original user data information to described MS, send the location registers message of accepting confirmation via visit BSC to MS afterwards.

Wherein, described visit BSC, ownership BSC connect local switch LE by the V5 interface.

The location registers message of the MS that the BSC of visit described in the step a receives comprises at least: the cell ID at international mobile phone identification code IMSI, Electronic Serial Number ESN, the current place of described MS, BSC sign, KI.

Visit BSC receives after the location registers message of MS among the described step a, further comprises:

BSC is to described MS authentication in visit, if visit BSC judges from the ownership BSC that registers the MS of request as current initiation, then handles according to the local call process; Otherwise, execution in step b.

The BSC of ownership described in the step c carries out authentication to MS and is the checking KI, if key agreement, then authentication is passed through; Otherwise failed authentication judges that described MS identity is for illegal.

This method further comprises: described MS is as caller or when called, ownership BSC set up with described visit BTS between signalling path, and by visit BSC and visit BTS and send Extended Channel Assignment Message to MS.

Carry BS institute assigned radio resource in the described Extended Channel Assignment Message.

Described ownership BSC, further comprises after MS sends extended channel message by visit BSC: MS sets up the communication traffic channel between LE and the MS with carrying out service negotiation between ownership BSC.

Realize the method for roaming in the wireless local loop system provided by the present invention, have the following advantages:

1) roaming implementation method of the present invention, under the condition that does not increase any new hardware, make the MS that is in visit BSC service area visit the ownership BSC of this MS by visit BSC and A3/A7 link, carry out authentication and finish the location registration of MS, and then the roaming function of realization MS, because this process does not need LE to participate in, therefore simplified the process that the MS roaming function realizes.

2) roaming implementation method of the present invention, owing to adopt standard V5 interface between BSC and the LE, therefore can be easily and the LE intercommunication of different vendor, thereby greatly reduce the complexity of WLL system group network.

Description of drawings

Fig. 1 (a) is the networking structure schematic diagram of existing WLL system;

Fig. 1 (b) is the networking structure schematic diagram of WLL of the present invention system;

Fig. 2 be in the embodiment of the invention MS at the signaling process schematic diagram of visit BSC upper/lower positions enrollment process;

Signaling process schematic diagram when Fig. 3 does caller for MS in the embodiment of the invention;

Fig. 4 makes signaling process schematic diagram when called for MS in the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing and embodiments of the invention method of the present invention is described in further detail.

Fig. 1 (b) is the networking structure schematic diagram of WLL of the present invention system, shown in Fig. 1 (b), the present invention is being example based on the wireless access system of code division multiple access (CDMA) the standard mode by V5 interface access fixed network LE, when MS is roamed into visit BSC service area, use the implementation procedure of various communication services to be described.Described business realizing process is equally applicable to the wireless access system of CDMA 2000 (CDMA 2000), Wideband Code Division Multiple Access (WCDMA) (WCDMA) standard.Described LE can become a voice access module of NGN switch along with the evolution of fixed network network, and the wireless access system of CDMA standard of the present invention can also insert other communication systems by multiservice interface and provide abundant communication service for MS.Therefore, not only supporting Speech Communication based on the WLL of CDMA and V5 interfacing, and support the various non-voice services and following broadband services, is the important technical that wireless communication networks further develops.

Described V5 interface, its physical layer are the pulse code modulation (pcm) links.The present invention utilizes the assignment function of V5 interface, comprises functions such as the configuration of V5 interface link, C via configuration, the interior pre-connection configuration of Access Network (AN), and cooperating ownership BSC is that LE and MS set up the communication service passage to the Extended Channel Assignment Message that MS sent.

Among the present invention, store the ownership BSC of the BSC of MS primary data information (pdi) for this MS, remaining BSC is the visit BSC of this MS.That is to say that ownership BSC and visit BSC do not have difference in essence, just different and call different with respect to the relation of the BSC under the MS.In addition, the A3/A7 link by standard between each BSC links to each other, and described A3/A7 link does not need expansion directly to use, and is used to ownership BSC and visit BSC that signalling path is provided.Be equipped with memory cell among each BSC, be used for the primary data information (pdi) of the MS of store home in self service range, promptly each BSC only need store the primary data information (pdi) of a cover MS, and canned data is different between the BSC.

Fig. 2 is that MS is at the signaling process schematic diagram of visit BSC upper/lower positions enrollment process in the embodiment of the invention, and as shown in Figure 2, MS carries out the process of location registers under visit BSC, comprising:

Step 201:MS sends registration message to the visit BSC of place service area.

Carry the information such as cell ID, BSC sign, KI at IMSI, the Electronic Serial Number (ESN) of this MS, current place in the described registration message.

Step 202: after visit BSC receives registration message MS being carried out authentication, self is not the ownership BSC of this MS if determine, and then the ownership BSC to this MS transmits location update request message.

If described visit BSC judges when the ownership BSC of the MS that asks as current initiation registration, then handle according to the flow process of local call, finish current handling process.

Step 203: ownership BSC sends the position renewal to visit BSC and accepts message after this MS is carried out the position renewal.

Step 204: visit BSC sends registration to MS and accepts message.

Signaling process schematic diagram when Fig. 3 does caller for MS in the embodiment of the invention as shown in Figure 3, when MS does caller, comprising:

Step 301:MS sends call message to visit BTS, and visit BTS sends call message to visit BSC.

Described BSC, its function class is similar to RAC of the prior art.

Carry this MS place in the described call message and work the configuration information of exhaling the sub-district, the call property of MS, wherein call property comprises version number, slotted mode, consultation parameter etc.

Step 302: return the transmission acknowledge message to MS after visit BTS receives call message.

Step 303: it self is not the ownership BSC of current caller MS to described caller MS authentication if judge that visit BSC receives after the call message of MS, and then the ownership BSC to MS transmits call message; Described MS returns acknowledge message to MS after ownership BSC authentication.

If described visit BSC judges when self being the ownership BSC of current caller MS, then carry out call treatment according to the flow process of local call, finish current handling process.

Step 304: ownership BSC receives the call message of described MS and MS is carried out authentication, if this MS identity is illegal, then abandons this call request, finishes current handling process; Otherwise authentication is passed through, and sets up calling with LE and get in touch, and execution in step 305 then.

Described ownership BSC carries out authentication to MS, realizes that by the checking KI if key agreement, then authentication is passed through; Otherwise failed authentication judges that this MS identity is for illegal.

Step 305: ownership BSC sets up and visits the signalling path between BTS, and sends Extended Channel Assignment Message by visit BSC and visit BTS to MS.

Carry BS institute assigned radio resource in the described assignment message, comprising: the configuration of primary channel, medium access control (MAC) multiplex mode, rate set, frequency, frequency range, frame biasing, Radio Resource control (RC), pilot tone (PN), walsh code (walshcode), business option, power-related parameter and international mobile phone identification code information such as (IMSI).

Carry out service negotiation between step 306:MS and the ownership BSC, set up the communication traffic channel between LE and the MS.

Described service negotiation mainly is the multiplex mode of determining business option, MAC layer, radio configuration parameters etc.

Fig. 4 makes signaling process schematic diagram when called for MS in the embodiment of the invention, and as shown in Figure 4, MS does to comprise when called:

Step 401:LE sends beep-page message to called MS to the ownership BSC of called MS.

Step 402: described ownership BSC carries out authentication to called MS, if authentication is passed through then to transmit beep-page message, execution in step 403 to the visit BSC at this MS place; If failed authentication is then abandoned this calling, finish current handling process.

Step 403: ownership BSC and LE set up to call out and get in touch.

Step 404: visit BSC sends beep-page message by visit BTS to MS.

Step 405: paged MS sends page-response message by visit BTS to visit BSC.

Carry the call property of this MS in the described page-response message, comprise version number, slotted mode, consultation parameter etc.

Step 406: visit BSC sends page-response message to ownership BSC.

The positional information at this current place of MS of portability in the described page-response message, and the call property of this MS comprise version number, slotted mode, consultation parameter etc.

Step 407: ownership BSC sets up and visits the signaling channel between BTS, and sends Extended Channel Assignment Message by visit BTS to terminal.

Carry BS institute assigned radio resource in the described Extended Channel Assignment Message, comprising: information such as the configuration of primary channel, MAC multiplex mode, rate set, frequency, frequency range, frame biasing, RC, PN, walshcode, business option, power-related parameter and IMSI.

Carry out service negotiation between step 408:MS and ownership BSC, set up the communication traffic channel between LE and the MS.

Described service negotiation mainly is the multiplex mode of determining business option, MAC layer, radio configuration parameters etc.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (8)

1. realize the method for roaming in the wireless local loop WLL system, the original user data information at home base station controller BSC side memory mobile terminal MS is characterized in that this method comprises:

A, visit base station controller BSC receive the location registers message of the MS roam into self service area;

The visit BSC at b, the current place of MS transmits location registers message to the ownership BSC of described MS;

C, described ownership BSC carry out authentication according to original user data information to described MS, send the location registers message of accepting confirmation via visit BSC to MS afterwards.

2. method according to claim 1 is characterized in that, described visit BSC, ownership BSC connect local switch LE by the V5 interface.

3. method according to claim 1, it is characterized in that the location registers message of the MS that the BSC of visit described in the step a receives comprises at least: the cell ID at international mobile phone identification code IMSI, Electronic Serial Number ESN, the current place of described MS, BSC sign, KI.

4. method according to claim 1 is characterized in that, visit BSC receives after the location registers message of MS among the described step a, further comprises:

BSC is to described MS authentication in visit, if visit BSC judges from the ownership BSC that registers the MS of request as current initiation, then handles according to the local call process; Otherwise, execution in step b.

5. method according to claim 1 is characterized in that, the BSC of ownership described in the step c carries out authentication to MS and is the checking KI, if key agreement, then authentication is passed through; Otherwise failed authentication judges that described MS identity is for illegal.

6. method according to claim 1, it is characterized in that after the step c, this method further comprises: described MS is as caller or when called, belong to the signalling path between BSC foundation and the described visit BTS, and send Extended Channel Assignment Message to MS by visit BSC and visit BTS.

7. method according to claim 6 is characterized in that, carries BS institute assigned radio resource in the described Extended Channel Assignment Message.

8. method according to claim 6 is characterized in that, described ownership BSC, further comprises after MS sends extended channel message by visit BSC: MS sets up the communication traffic channel between LE and the MS with carrying out service negotiation between ownership BSC.

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