CN1138426C - A method for realizing voice channel exchange in call connection of mobile communication system - Google Patents

Abstract

The present invention relates to a phonetic channel exchange method for calling adaptation in a mobile communication system. Exchange networks are added in base station receiving and transmitting channel stations; a mobile communication system completes the authentication to a call mobile station and the determination to the position area of a called mobile station; then, the mobile communication system originates a call; information of the call and the called covering areas of the base station receiving and transmitting channel stations of mobile stations is obtained; the mobile communication system judges whether the information is in the same base station receiving and transmitting channel station or not; if true, the added exchange networks in the base station receiving and transmitting channel stations complete the calling adaptation of phonetic channels; if false, a mobile exchanger completes the calling adaptation of the phonetic channels. The present invention can reduce the circuity of telephone channels and data flow among son systems of the mobile communication system.

Description

A method for realizing voice channel exchange in call connection of mobile communication system

The present invention relates to a mobile communication system, and more specifically refers to a method for realizing the call connection of the mobile communication system and supporting the base station to complete voice channel exchange.

In the current mobile communication system (such as: global digital mobile communication system GSM, code division multiple access system CDMA, wideband code division multiple access system WCDMA, code division multiple access system CDMA2000, etc.), the exchange of voice channels in call connection is performed by mobile Switches, such as the mobile switching center (MSC) in the GSM system, the core network (CN) in the WCDMA system, and the mobile switching center (MSC) in the CDMA2000 system, even if the calling and called mobile stations are located in the same base station (such as the base station in the GSM system Transceiver station BTS, base station NodeB in WCDMA system, base station transceiver station BTS in CDMA2000 system) coverage area, voice channel exchange still needs to be completed by mobile exchange.

As shown in Figure 1, the mobile station call mobile station connection process under the same base station coverage area of the Global System for Mobile Communications (GSM) includes the following steps: 1) Mobile station a (Msa) passes through the base station system BSS (including base transceiver station BTS and The base station controller (BSC) sends the Mobile Station International Integrated Services Digital Network Number (MSISDN) to the MSC to complete the processes of channel request, service request, authentication request, channel assignment, etc.; /AUC) initiates a request to obtain the mobile station roaming number (MSRN); 3) the visitor location register (VLR) provides the mobile station roaming number (MSRN) and sends it back to the mobile switching center (MSC); 4) mobile switching center (MSC) analysis The mobile station roaming number (MSRN) knows that the called party is the user of the local office, and sends an incoming message (S.F.I.C) to the VLR; 5) the VLR sends a paging request to the MSC; 6) the MSC sends a paging request to the base station system (BSS) And find the mobile station b (Msb); 7) Complete the exchange of the voice channel in the MSC.

The exchange of the voice channel in the above call connection is completed in the MSC. This will cause detours between BTS and BSC, and between BSC and MSC, thereby increasing unnecessary data transmission traffic and transmission delay between subsystems, especially for some transmission systems, such as satellite transmission systems, the delay and bit error There are many introductions, and the delay of the double-hop is about 540 milliseconds, which increases the rental cost of the transmission link.

The purpose of the present invention is to provide a method for realizing the voice channel exchange in the call connection of the mobile communication system, which can reduce the detour of the speech path, reduce the data flow and transmission delay between the subsystems of the mobile system, and save the lease of the transmission link cost.

In order to achieve the above-mentioned purpose, a kind of method that the present invention provides realizes the voice channel exchange in the call connection of mobile communication system, comprises the following steps: a, increases switching network in base transceiver station; authentication of the mobile station, determine the location area to which the called mobile station belongs, and initiate paging to the called mobile station; c, obtain the information of the coverage area of the base station transceiver station where the calling and calling parties of the mobile station are located, and determine the location of the called mobile station. Whether the calling parties are located in the same base transceiver station; d, when it is judged that the calling party and the called party are located in the same base transceiver station, then the voice channel connection is completed by the switching network added in the base transceiver station; e, when it is judged that the calling party and the called party When the two parties are located in different base transceiver stations, the mobile exchange completes the connection of the voice channel.

In the above-mentioned method for realizing the voice channel exchange in the call connection of the mobile communication system, when the above-mentioned mobile communication system is the Global System for Mobile Communication (GSM), in step c, obtain the coverage of the base transceiver station where the mobile station is calling The area information is achieved by the calling party of the mobile station carrying the cell identification number, and the mobile switching center or the base transceiver station judges whether the calling and called mobile stations are located in the service area of the same base transceiver station.

In the above-mentioned method for realizing the voice channel exchange in the call connection of the mobile communication system, when the above-mentioned mobile communication system is a broadband code division multiple access system, in step c, obtain the coverage area of the base station transceiver station where the mobile station is calling The information is obtained by carrying cell identification information on the calling mobile station, and the core switching network or the base station judges whether the calling and called mobile stations are located in the same base station service area.

Due to the adoption of the above method, when both the calling party and the called party are located at the same base transceiver station, the switching network added in the base transceiver station completes the switching of the voice channel. On the one hand, it reduces the detour of the voice channel and the data flow between the subsystems of the mobile communication system, thereby reducing the rental cost of transmission, especially for systems with large data flow such as WCDMA and CDMA2000, which has greater significance; on the other hand, it reduces unnecessary The delay caused by the transmission and the impact on the voice quality, the voice exchange of the calling and called users in the same BTS is completed in the BTS, avoiding unnecessary double-hop delay.

The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the schematic flow chart of existing GSM system mobile call mobile under the same BTS;

Fig. 2 is a schematic flow sheet of the present invention;

Fig. 3 is the schematic flow chart that the present invention is applied in GSM system;

FIG. 4 is a schematic flow chart of the application of the present invention in a WCDMA system.

Please refer to Fig. 2, a kind of method provided by the present invention realizes the voice channel exchange in the call connection of mobile communication system, comprises the following steps:

a, adding a switching network in the base transceiver station;

b. The mobile communication system completes the authentication of the calling mobile station, determines the location area to which the called mobile station belongs, and initiates paging to the called mobile station;

c. Obtain information about the coverage area of the base transceiver station where both the calling party and the called party of the mobile station are located, and determine whether the calling party and the called party are located at the same base transceiver station;

d, when it is judged that both the calling party and the called party are located in the same base transceiver station, the voice channel connection is completed by the switching network added in the base transceiver station;

e. When it is judged that both the calling party and the called party are located in different base station transceiver stations, the mobile exchange completes the connection of the voice channel.

Please combine with that shown in Figure 3, when the above-mentioned mobile communication system is the Global System for Mobile Communications (GSM), the calling party of the mobile station carries the calling cell identification number, and the mobile switching center (MSC) or the base transceiver station (BTS) ) to determine whether the calling and called mobile stations are located in the service area of the transceiver station of the same base station.

The method specifically comprises the following steps: 1. Obtain the cell identification numbers of both the calling and called parties of the mobile station

The service area of the BTS is determined by the cell identification number CGI. For the omni-directional base station, there is only one cell, which corresponds to one cell identification number; the directional base station has a corresponding number of cells according to the number of sectors, corresponding to multiple cell identification numbers.

In the call connection process, it is necessary to determine the cell where the mobile station is currently located according to the cell identification number of the BTS service area where the called mobile station is located, obtained from the VLR.

The cell identification number of the called mobile station can be obtained in the existing call flow.

The cell identification number of the calling mobile station can be obtained by carrying the cell identification number information in the message sent by the mobile station to the base station system. 2. MSC or BTS judges whether the calling and called mobile users are located in the same BTS service area

The MSC needs to add a list of cell identification numbers of the same BTS. According to the existing call flow, after completing the authentication of the calling mobile station, determining the location area to which the called mobile station belongs, and initiating paging for the called mobile station, the MSC checks Regarding the table, it is determined whether the current cell identification numbers of the calling and called mobile users belong to the same BTS, thereby determining whether the calling and called mobile users are located in the service area of the same BTS.

In order to reduce the impact on the existing network, the above functions can also be implemented in the BTS. 3. BTS that supports internal voice channel switching function

The BTS has a switching network that supports voice channel switching. The structure (which can be a time switch or a space switch) and capacity of the switching network needs to be determined according to the statistical results of the possibility that the calling and called mobile stations are located in the same BTS service area.

The implementation method of the switching network is relatively mature, and the switching network board, switching network slice, etc. can be used, and the existing switching network in the MSC can also be used for reference. 4. According to the judging result of whether the calling and called mobile users are located in the same BTS service area, select the appropriate voice channel switching method

If the calling and called mobile users are not located in the same BTS service area, the voice channel switching function is completed according to the current existing process, that is, the voice channel switching is completed by the MSC;

If the calling and called mobile users are located in the same BTS service area, notify the BTS that supports the internal switching function to complete the switching function of the voice channel.

To sum up, the functions of the voice channel exchange in the global system for mobile communications (GSM) call connection are as follows: when the mobile station calls, it carries the information of the calling cell identification number; MSC adds the list of the same BTS cell identification number; Judging whether the current cell identification numbers of the calling and called mobile users belong to the same BTS, or this task is completed by the BTS; the BTS has a switching network and can complete the voice channel switching function.

Please combine with Figure 4, when the above mobile communication system is a wideband code division multiple access system (WCDMA), the calling party of the mobile station carries the identification information of the calling cell, which is judged by the core switching network (CN) or the base station (NodeB) Whether the calling and called mobile stations are located in the service area of the same base station.

Claims (3)

1. a method that realizes voice channel exchange in the mobile communcations system call proceeding comprises the following steps:

A increases switching network in base transceiver station;

B, mobile communcations system finish to the authentication of caller travelling carriage, to determining and called mobile station is initiated paging in called mobile station belonging positions district;

C obtains the information of the travelling carriage calling and called both sides base transceiver station area of coverage of living in, and judges whether the calling and called both sides are positioned at same base transceiver station;

D when judging that the calling and called both sides are positioned at same base transceiver station, then finishes continuing of voice channel by the switching network that increases in base transceiver station;

E when judging that the calling and called both sides are positioned at the different base station transceiver station, then finishes continuing of voice channel by mobile switch.

2. a kind of method that realizes voice channel exchange in the mobile communcations system call proceeding as claimed in claim 1, it is characterized in that, when above-mentioned mobile communcations system is Golbal System for Mobile Communic-ations (GSM), among the step c, the information of obtaining the MO mobile origination base transceiver station area of coverage of living in is carried cell identification by MO mobile origination and number is reached, and judges by mobile switching centre or base transceiver station whether the calling and called travelling carriage is positioned at same base transceiver station service area.

3. a kind of method that realizes voice channel exchange in the mobile communcations system call proceeding as claimed in claim 1, it is characterized in that, when above-mentioned mobile communcations system is broadband CDMA system, among the step c, the information of obtaining the MO mobile origination base transceiver station area of coverage of living in is carried cell identification information by MO mobile origination and is reached, and judges by core switching network or base station whether the calling and called travelling carriage is positioned at same base station service area.

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