CN100461945C

CN100461945C - Method for realizing local exchange in wireless local loop system

Info

Publication number: CN100461945C
Application number: CNB2005100799373A
Authority: CN
Inventors: 尹树成; 谢寿波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-06-27
Filing date: 2005-06-27
Publication date: 2009-02-11
Anticipated expiration: 2025-06-27
Also published as: CN1889760A

Abstract

A method for realizing local interchange in radio local loop system includes recording and updating information of local user terminal in real time by RAC, judging whether called party is local user or not according to recorded information of user terminal when call launched by calling party is received by RAC and directly down-sending the paging message to called terminal to finalize conversation connection if it is or otherwise launching no local call through local switch.

Description

A kind of method that realizes local exchange in the wireless local loop system

Technical field

The present invention relates to wireless communication field, particularly relate to a kind of method that realizes local exchange in the wireless local loop system.

Background technology

Wireless local loop (WLL) is meant utilizes wireless technology (comprising microwave, cellular communication, cordless telephone transmission) to provide telecommunication service for the mobile subscriber in fixed-line subscriber zone.In brief, replace electric wire, cable between substation and the exchange with wireless connections.Usually adopt wireless technology to provide the transmission system of telecommunication service all to belong to wireless local loop (WLL) in the local loop section.

WLL system commonly used at present comprises following several:

WLL system based on global system for mobile communications (GSM) or advanced mobile telephone service (AMPS).

WLL system based on Personal Communications Services (PCS) or personal handyphone system (PHS) standard.

WLL system based on advanced person's digital cordless phone (DECT) standard.

WLL system based on the CDMA2000 standard.

WLL system based on the WCDMA standard.

Wherein, based on the WLL system group network figure of CDMA2000 standard, as shown in Figure 1.At present based on the WLL system of CDMA2000 standard in the flow process of actual treatment business, no matter no matter whether whether the calling and called user in the zone that same RAC covered, be the calling of same RAC promptly, all inserts local switch (LE) and exchange.If the situation of described calling and called user in the zone that same RAC covered occur, then wasted interface (V5 interface) resource between RAC and the LE, and then when the V5 interface resource is not enough, caused terminal to call out.

Summary of the invention

The invention provides a kind of method that realizes in the wireless local loop system local exchange, in the zone that same RAC covered, also need insert local switch and exchange and have a waste problem of resource in order to solve in the prior art calling and called user.

The inventive method comprises the following steps: the user terminal information of Radio Access Controller (RAC) record and real-time update this locality; When described RAC receives the calling that caller initiates, judge according to the user terminal information of record called whether in this locality, if, finish the traffic connection then directly to the terminal called issuing page message; If not, then initiate non-local call by local switch (LE).

To terminal called issuing page message after also comprise the following steps: directly that at RAC RAC obtains the calling and called service option information respectively from the response message that terminal called is sent and in the call request message sent of calling terminal; Judge according to described calling and called service option information whether the currently used vocoder of calling and called terminal is identical,, then directly finish traffic and connect if identical; Otherwise, but after RAC notice vocoder allocation units are the vocoder of calling and called terminal distribution bi-directional conversion calling and called coding that terminal adopts, perhaps, finish the traffic connection again after making the calling and called terminal adopt identical vocoder by service negotiation.

Described user terminal information is international mobile subscriber identity (IMSI) and/or telephone number.

Described user terminal information is stored in the internal database of RAC.

If behind the RAC issuing page message, do not receive the response message that terminal called is sent, then send release message to calling terminal, finish conversation; Perhaps after RAC receives the release message that either side sends, send release message, finish conversation to opposite side.

The inventive method beneficial effect is as follows: when RAC receives calling, judge that by inquiring about the built-in VLR Database of this RAC (VDB) caller and called subscriber are current whether all in the zone that this RAC covered, judge that promptly whether calling and called are all in this locality.If judge to show that calling and called then exchange without local switch (LE) all in this locality, and, finish traffic to connect, so just saved interface (V5) resource between RAC and the local switch directly by the RAC issuing page message.And judge and to obtain the currently used vocoder of calling and called when identical, then do not use vocoder, connect and directly carry out traffic, so both improved voice quality, reduced the demand of system again to vocoder, reduced system cost.

Description of drawings

Fig. 1 is the WLL system group network figure based on the CDMA2000 standard;

Fig. 2 is the inventive method flow chart of steps.

Embodiment

In order to save the interface resource between Radio Access Controller (RAC) and the local switch (LE), the inventive method receives when calling out at RAC judges that whether calling and called are all in this locality, if judge and show that calling and called are all in this locality, then exchange without local switch (LE), and directly by the RAC issuing page message.The flow process of the inventive method as shown in Figure 2, its concrete implementation step is as follows:

The user terminal information of S1, Radio Access Controller (RAC) record and real-time update this locality.

Based on the WLL system of CDMA2000, user terminal has IMSI and two kinds of information that are used for this user terminal of unique identification of telephone number.In described RAC, have the IMSI that is used to store the user terminal in current this RAC of being in institute overlay area and/or the VLR Database (VDB) of telephone number.When user terminal entered regional that this RAC covers, RAC obtained this user's IMSI and/or telephone number, and is recorded among the described VDB; When user terminal left regional that this RAC covers, the RAC monitoring is this user's IMSI and/or telephone number among the deletion VDB also.

S2, judge that whether calling and called are all in this locality.

When the calling subscriber in being in the zone that this RAC covers made a call, RAC resolved its calling party's information, i.e. the IMSI of resolving called and/or telephone number.Whether the inquiry called subscriber is current in the zone that this RAC covered in described VLR Database (VDB) in view of the above.

S3, if the called subscriber not in the zone that this RAC covered, be that current calling and called user is not all in this locality, then according to method that prior art provided, Calling Side RAC sends exchange request message (V5_SETUP) by the interface between RAC and the LE to LE, and exchange by LE, initiate non-local call.

S4, if the called subscriber in the zone that this RAC covered, promptly current calling and called are with per family in this locality, then directly to called subscriber's issuing page message.

RAC if do not receive the response message that terminal called is sent in the time limit of regulation, then thinks communication failure behind the called user terminal issuing page message, and sends release message to calling terminal, discharges the calling of call subscriber terminal, process ends.

S5, if receive the response message that called user terminal is sent, judge then whether the calling and called vocoder identical.

RAC is behind the called user terminal issuing page message, if receive the response message that terminal called is sent, then from described response message, obtain the relevant information of called service option, and the relevant information of from calling subscriber's call request message, obtaining the calling service option.The vocoder types information that includes the current use of this user in the relevant information of described business option, and other information of selecting by this user.Afterwards, according to the calling and called service option information that obtains, judge whether the currently used vocoder of calling and called terminal is identical.

S6, if the currently used vocoder of calling and called terminal is identical, then RAC sends a notification message to the vocoder allocation units, informs to be regardless of and joins vocoder, and do not use vocoder in communication process.Then directly carry out the channel loopback, finish traffic and connect, realize the conversation between the calling and called user.

If the currently used vocoder difference of calling and called terminal realizes the intercommunication of calling and called speech coding by following dual mode:

Mode one: RAC sends a notification message to the vocoder allocation units, the currently used vocoder types of calling and called is informed described vocoder allocation units, described vocoder allocation units are redistributed the vocoder of calling and called in view of the above, but make the voice coding modes of the vocoder bi-directional conversion calling and called terminal after the distribution.After traffic was connected, the described vocoder bi-directional conversion calling and called speech coding of redistributing realized the conversation between the calling and called user.

Mode two: because the vocoder types that existing terminal is supported is a kind of incessantly, so pass through service negotiation, make the calling and called user terminal adopt identical vocoder, so just need not carry out code conversion work, consult the successfully directly conversation between the realization calling and called user of back.

S7, after receiving the release message that either side sends, finishes RAC conversation.

Either party in calling subscriber or called subscriber has carried out the on-hook operation, and then RAC will receive the release message that the on-hook side is sent.Afterwards, RAC sends release message to opposite side, finishes conversation.

By the enforcement of the foregoing description, when the calling and called user is in the zone that same RAC covered, does not insert local switch and exchange, and carry out exchange in the zone by RAC, reached the purpose of saving the interface resource between RAC and the LE.And the inventive method was recognized the currently used vocoder of calling and called earlier before carrying out the traffic making operation.Under the identical situation of calling and called vocoder, be not to use vocoder, and directly carry out the channel loopback, realize the conversation between the calling and called user; Under the different situation of calling and called vocoder, after carrying out voice intercommunication and preparing, carry out speech coding conversion and channel loopback again, the conversation between the realization calling and called user.Reach raising speech tonequality like this, reduced the effect of system's vocoder configuration quantity.

From the foregoing description as seen, if do not have local switch (LE) in the system, the situation in the calling and called user is in the zone that same RAC covers can realize this locality exchange in the wireless local loop system equally, promptly converses at the calling and called of RAC inside.So this situation also should be within protection scope of the present invention.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a method that realizes local exchange in the wireless local loop system comprises the following steps:

The user terminal information of Radio Access Controller RAC record and real-time update this locality;

When described RAC receives the calling that caller initiates, judge according to the user terminal information of record called whether in this locality, if, finish the traffic connection then directly to the terminal called issuing page message; Otherwise, initiate non-local call by local switch LE.

2. the method for claim 1 is characterized in that, RAC directly also comprises the following steps: behind the terminal called issuing page message

RAC obtains the calling and called service option information respectively from the response message that terminal called is sent and in the call request message sent of calling terminal;

Judge according to described calling and called service option information whether the currently used vocoder of calling and called terminal is identical,, then directly finish traffic and connect if identical; Otherwise, but after RAC notice vocoder allocation units are the vocoder of calling and called terminal distribution bi-directional conversion calling and called coding that terminal adopts, perhaps, finish the traffic connection again after making the calling and called terminal adopt identical vocoder by service negotiation.

3. method as claimed in claim 1 or 2 is characterized in that, if behind the RAC issuing page message, do not receive the response message that terminal called is sent, then sends release message to calling terminal, finishes conversation; Perhaps after RAC receives the release message that either side sends, send release message, finish conversation to opposite side.

4. method as claimed in claim 3 is characterized in that, described user terminal information is international mobile subscriber identity IMSI and/or telephone number.

5. method as claimed in claim 4 is characterized in that described user terminal information is stored in the internal database of RAC.