CN101635994A - Method for acquiring speech coding capacity of wireless network and realizing TrFO by core network - Google Patents
Method for acquiring speech coding capacity of wireless network and realizing TrFO by core network Download PDFInfo
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Abstract
The invention discloses a method for realizing speech-free coding/decoding conversion operations at a core network side after call establishment, which comprises that: a mobile switching center server where a calling party is positioned and a mobile switching center server where a called party is positioned initiate request message for acquiring speech coding capacity to respectively corresponding base station controllers of the calling party and the called party respectively; after receiving the request message, corresponding base station controllers acquire speech coding capacity information which can be used for the call in base station subsystems thereof respectively and report the acquired speech coding capacity information and cell identifiers of corresponding cells to the corresponding mobile switching center servers; and after receiving the speech coding capacity sent by the corresponding base station controllers, the mobile switching center servers of the calling party and the called party select a piece of shared speech coding capacity information which can be used for the call through negotiation, and then inform the calling party and the called party of conversation by using the shared speech coding mode. The method can avoid unnecessary speed code conversion after call establishment.
Description
Technical field
The present invention relates to field of mobile communication, relate in particular to the method that a kind of core net is obtained the wireless network speech coding capacity and realized TrFO (Transcoder Free Operation, no encoding and decoding speech conversion operations).
Background technology
At existing global system for mobile communications (Global System for Mobile Communications, be called for short GSM) in, (the Mobile Switching Center of mobile switching centre, be called for short MSC) and base station controller (Base Station Controller, abbreviation BSC) the A interface between is based on time division multiplexing (Time Division Multiple, be called for short TDM) carrying, transmission is the coded voice signal of employing pulse code modulation (Pulse Code Modulation the is called for short PCM) mode of 64Kbps on it.What transmit on the air interface Um Interface between portable terminal (Mobile Station is called for short MS) and base transceiver station (Base TransceiverStation is called for short BTS) is the compressed voice code signal.Interface between BTS and BSC is an Abis interface, also is based on TDM carrying, and what transmit on this interface is the compressed voice code signal identical with Um Interface.BSC has code conversion and rate adaptation function (Transcode Rate Adaption Unit, be called for short TRAU), can finish the conversion of coded voice signal of the PCM mode of the 64Kbps that transmits on the compressed voice code signal that transmits on the Abis interface and the A interface, the unit of realizing this function then is called codec unit (TransCoder is called for short TC).
Development along with the third generation mobile system, at 3GPP release 4 (3rd GenerationPartnership Project release 4, third generation partner program edition 4) after, core network element has realized that control separates with carrying, two new network elements have been formed: Mobile Switching Center Server (MobileSwitching Center Server, be called for short MSC Server) and media gateway (Media Gateway is called for short MGW).Interface between MSC Server and the MGW is a Mc interface, and MSC Server finishes control to MGW by Mc interface.Simultaneously, along with the introducing of IP technology in wireless network, the A interface progressively adopts based on IP carrying (A Interface Over IP is called for short AoIP), and therefore traditional GSM network architecture also changes.Because MGW itself has code conversion and rate adaptation function, therefore just can cancel the TRAU function among the BSC, promptly cancel the TC among the BSC, also transmit the compressed voice encoding and decoding signal identical at the A interface, utilize the code conversion of MGW and the coding-decoding operation that rate adaptation function is carried out voice then with Abis interface.This framework has significantly reduced the requirement to A interface transfer resource, helps operator and reduces running cost, can reduce the number of times of encoding and decoding speech in the existing GSM network simultaneously, and then improve voice quality, realizes TrFO before call setup.
Summary of the invention
The technical problem to be solved in the present invention provides the method that a kind of core net is obtained the wireless network speech coding capacity and realized TrFO, after being implemented in call setup, core net is obtained the speech coding capacity of wireless network and is assigned the function of suitable Speech version in view of the above for it.
For addressing the above problem, the invention provides the method that a kind of core net is obtained the wireless network speech coding capacity, comprising:
, after call setup connects, call out the Mobile Switching Center Server at participant place and initiate to obtain the speech coding capacity request message two sides that participate in calling out to the base station controller of described calling participant; After described base station controller is received, in its place base station sub-system, obtain can be used for the speech coding capacity information of this calling, and the described speech coding capacity information that will obtain and the cell identifier of respective cell report described Mobile Switching Center Server.
Further, said method also can have following feature:
Described obtaining carried the call identifier that is used to identify this calling in the speech coding capacity request message;
Described base station controller obtains can be used for the speech coding capacity information of this calling in its place base station sub-system according to described call identifier.
Further, said method also can have following feature:
The described speech coding capacity information source that can be used for this calling is in described sub-district, calling participant place and/or described calling participant place adjacent cells of cells.
Further, said method also can have following feature:
Carry the speech coding type that described sub-district, calling participant place and/or described calling participant place adjacent cells of cells are supported in the described speech coding capacity information that described base station controller reports;
The speech coding type that described sub-district, calling participant place and/or described calling participant place adjacent cells of cells are supported comprises: any one among global system for mobile communications full-rate codes GSM_FR, global system for mobile communications half rate encoded GSM_HR, global system for mobile communications EFR coding GSM_EFR, adaptation rate half rate encoded AMR_HR, adaptation rate full-rate codes AMR_FR or the adaptation rate _ wideband A MR_WB or combination in any.
Further, said method also can have following feature:
When calling out sub-district, participant place and/or described calling participant place adjacent cells of cells support AMR_HR, AMR_FR or AMR_WB, also comprise the rate information of AMR coding in the described speech coding capacity information that described base station controller reports.
For addressing the above problem, the present invention also provides core-network side behind a kind of call setup to realize the method for no encoding and decoding speech conversion operations, comprising:
The Mobile Switching Center Server at the Mobile Switching Center Server at calling party place and callee place initiates to obtain the speech coding capacity request message to each self-corresponding base station controller of described calling and called side respectively;
After described each corresponding base station controller is received, in its place base station sub-system, obtain can be used for the speech coding capacity information of this calling respectively, and the cell identifier of described speech coding capacity information that will obtain and respective cell reports corresponding described Mobile Switching Center Server;
Described calling and called both sides' Mobile Switching Center Server is after all receiving the speech coding capacity that the corresponding base station controller sends, select a common speech coding capacity information that can be used for this calling through consultation, notify described calling party and described callee all to converse then respectively with this common voice coding modes.
Further, said method also can have following feature:
Described obtaining carried the call identifier that is used to identify this calling in the speech coding capacity request message;
Each self-corresponding base station controller of described calling and called both sides all obtains can be used for the speech coding capacity information of this calling in its place base station sub-system according to described call identifier.
Further, said method also can have following feature:
The described speech coding capacity information source that can be used for this calling that the base station controller of described calling party's correspondence obtains is in sub-district, described calling party place and/or described calling party place adjacent cells of cells;
The described speech coding capacity information source that can be used for this calling that the base station controller of described callee's correspondence obtains is in sub-district, described callee place and/or described callee place adjacent cells of cells.
Further, said method also can have following feature:
Carry the speech coding type that sub-district, described calling party place and/or described calling party place adjacent cells of cells are supported in the described speech coding capacity information that the base station controller of described calling party's correspondence reports;
Carry the speech coding type that sub-district, described callee place and/or described callee place adjacent cells of cells are supported in the described speech coding capacity information that the base station controller of described callee's correspondence reports;
The speech coding type that described calling party and sub-district, callee place and/or described calling participant place adjacent cells of cells are supported includes: any one among global system for mobile communications full-rate codes GSM_FR, global system for mobile communications half rate encoded GSM_HR, global system for mobile communications EFR coding GSM_EFR, adaptation rate half rate encoded AMR_HR, adaptation rate full-rate codes AMR_FR or the adaptation rate wideband A MR_WB or combination in any.
Further, said method also can have following feature:
When sub-district, described calling party place and/or described calling party place adjacent cells of cells support AMR_HR, AMR_FR or AMR_WB, also comprise the rate information of AMR coding in the described speech coding capacity information that the base station controller of described calling party's correspondence reports;
When sub-district, described callee place and/or described callee place adjacent cells of cells support AMR_HR, AMR_FR or AMR_WB, also comprise the rate information of AMR coding in the described speech coding capacity information that the base station controller of described callee's correspondence reports.
A kind of core net provided by the invention is obtained the wireless network speech coding capacity and is realized the method for TrFO, can make MSC Server based on the current sub-district, calling participant place of the BSS that receives and/or the speech coding capacity of this adjacent cells of cells, the voice coder code weight that can carry out behind the call setup is consulted, make because some reasons (being taken fully by other calling as some speech coding capacity) can't be reached TrFO when call setup calling, behind call setup, still can carry out the speech coding adjustment once more, omit the conversion of unnecessary speech coding, and then improve voice quality.This method do not require and changes existing Um Interface and Abis interface, to the portable terminal of existing network and base station without any influence.
Description of drawings
Fig. 1 is an AoIP situation lower network structural representation in the GSM communication system in the embodiment of the invention;
Fig. 2 obtains the flow chart of wireless network speech coding capacity method for core net in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
As shown in Figure 1, in gsm communication system, comprise in the network configuration when A interface carries based on IP: the Abis interface between the air interface Um Interface between mobile terminal MS 60, base transceiver station BTS 50, base station controller BSC 20, media gateway MGW 30, mobile switching center server MSC Server 10 and MS 60 and the BTS 50, BTS 50 and the BSC 20, BSC 20 based on TDM carrying respectively and between MGW 30, the MSC Server 10 based on the Mc interface between A interface, MSCServer 10 and the MGW 30 of IP carrying.Also have TC 40 among the MGW 30, it is used for realizing the voice rate adaption function behind call setup.Wherein, MS 60, BTS 50 and BSC 20 are positioned at the wireless network side, BTS 50 and the BSC 20 common BSS (base station sub-system) that form; MGW 30 and MSCServer 10 are positioned at core-network side.
As shown in Figure 2, after the calling and called both sides had set up calling, core net was obtained the method for wireless network speech coding capacity, may further comprise the steps:
201, the MSC Server 10 that calls out participant (being calling party or callee) place obtains the speech coding capacity request message by the A interface to the BSC of this callings participant 20 initiations, the speech coding capacity information that requires BSC 20 to report to can be used for this calling.MSC Server need not to indicate the cell identifier of calling out sub-district, participant place above-mentioned obtaining in the speech coding capacity request message, also need not to indicate the cell identifier of calling out participant place adjacent cells of cells, but can in this message, carry the call identifier of this time of expression calling.Wherein, this call identifier is with when call setup, and MSC Server 10 carries in the assignment request that BSC 20 sends, and to be used to identify the call identifier of this calling identical.Call identifier can adopt following arbitrary mode to represent: IP address and the addition of UDP (User Datagram Protoco (UDP)) port numbers with MSC Server obtain call identifier; Or with the internal module identifier of MSC Server as call identifier; Or with any one serial number of MSC Server inside as call identifier;
202, BSC 20 receive that MSC Server 10 sends obtain the speech coding capacity request message after, according to the call identifier that carries in this message, inquiry can be used for the speech coding capacity information of this calling in the BSS under it, and these abilities can derive from calls out sub-district, participant place and/or this calling participant place adjacent cells of cells; To can be used for the speech coding capacity information of this calling and the cell identifier of respective cell (call out sub-district, participant place and/or call out participant place adjacent cells of cells) then and send to MSC Server 10 by obtaining the speech coding capacity response message.Have a plurality ofly though be positioned at one of the wireless network side adjacent sub-district of calling out around the sub-district, participant place, the speech coding capacity that BSC20 will not can be used for all adjacent sub-districts of this calling all sends to MSC Server 10 by obtaining the speech coding capacity response message.When too high, the speech coding capacity that can be used for this calling of this neighbour sub-district just need not to send to MSCServer 10 by obtaining the speech coding capacity response message as certain adjacent cell load.This type of possible reason is a lot, has not just enumerated one by one herein.
Wherein, should comprise the speech coding type that respective cell is supported in the speech coding capacity information that BSC 20 reports, as any one or its combination in any among GSM_FR (GSM full-rate codes), GSM_HR (GSM half rate encoded), GSM_EFR (GSM EFR coding), AMR_HR (adaptation rate half rate encoded), AMR_FR (adaptation rate full-rate codes) or the AMR_WB (adaptation rate broadband).Support AMR_HR, AMR_FR or AMR_WB as respective cell, also need in speech coding capacity information, to carry the rate information of AMR coding.Can also carry the type information of A interface in speech coding capacity information, comprise that the A interface carries based on TDM based on IP carrying or A interface.
The calling and called both sides are behind call setup, and the method at core-network side realization TrFO may further comprise the steps:
301, the MSC Server at the MSC Server at calling party place and callee place respectively the A interface by separately obtain the speech coding capacity request message to what corresponding BSC initiated to carry call identifier, the speech coding capacity information that requires above-mentioned BSC to report to can be used for this calling;
302, corresponding BSC receive obtain the speech coding capacity request message after, according to the call identifier that carries in this message, inquiry can be used for the speech coding capacity information of this calling and by obtaining the speech coding capacity response message cell identifier of this ability information and respective cell is sent to corresponding M SC Server in the BSS under it respectively.The ability information that calling party's BSS inquires can derive from sub-district, calling party place and/or this calling party place adjacent cells of cells, and the ability information that callee's BSS inquires can derive from sub-district, callee place and/or this callee place adjacent cells of cells;
303, calling and called both sides' MSC Server is after all receiving the speech coding capacity that each self-corresponding BSC sends, find out a common speech coding capacity information that can be used for this calling through consultation, caller notification and callee converse with this common voice coding modes respectively then, to omit unnecessary sign indicating number type conversion and rate adapted operation.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1, a kind of core net is obtained the method for wireless network speech coding capacity, it is characterized in that,
, after call setup connects, call out the Mobile Switching Center Server at participant place and initiate to obtain the speech coding capacity request message two sides that participate in calling out to the base station controller of described calling participant; After described base station controller is received, in its place base station sub-system, obtain can be used for the speech coding capacity information of this calling, and the described speech coding capacity information that will obtain and the cell identifier of respective cell report described Mobile Switching Center Server.
2, the method for claim 1 is characterized in that,
Described obtaining carried the call identifier that is used to identify this calling in the speech coding capacity request message;
Described base station controller obtains can be used for the speech coding capacity information of this calling in its place base station sub-system according to described call identifier.
3, method as claimed in claim 1 or 2 is characterized in that,
The described speech coding capacity information source that can be used for this calling is in described sub-district, calling participant place and/or described calling participant place adjacent cells of cells.
4, the method for claim 1 is characterized in that,
Carry the speech coding type that described sub-district, calling participant place and/or described calling participant place adjacent cells of cells are supported in the described speech coding capacity information that described base station controller reports;
The speech coding type that described sub-district, calling participant place and/or described calling participant place adjacent cells of cells are supported comprises: any one among global system for mobile communications _ full-rate codes GSM_FR, global system for mobile communications _ half rate encoded GSM_HR, global system for mobile communications _ EFR coding GSM_EFR, adaptation rate _ half rate encoded AMR_HR, adaptation rate _ full-rate codes AMR_FR or the adaptation rate _ wideband A MR_WB or combination in any.
5, method as claimed in claim 4 is characterized in that,
When calling out sub-district, participant place and/or described calling participant place adjacent cells of cells support AMR_HR, AMR_FR or AMR_WB, also comprise the rate information of AMR coding in the described speech coding capacity information that described base station controller reports.
6, the method for the no encoding and decoding speech conversion operations of core-network side realization behind a kind of call setup is characterized in that,
The Mobile Switching Center Server at the Mobile Switching Center Server at calling party place and callee place initiates to obtain the speech coding capacity request message to each self-corresponding base station controller of described calling and called side respectively;
After described each corresponding base station controller is received, in its place base station sub-system, obtain can be used for the speech coding capacity information of this calling respectively, and the cell identifier of described speech coding capacity information that will obtain and respective cell reports corresponding described Mobile Switching Center Server;
Described calling and called both sides' Mobile Switching Center Server is after all receiving the speech coding capacity that the corresponding base station controller sends, select a common speech coding capacity information that can be used for this calling through consultation, notify described calling party and described callee all to converse then respectively with this common voice coding modes.
7, method as claimed in claim 6 is characterized in that,
Described obtaining carried the call identifier that is used to identify this calling in the speech coding capacity request message;
Each self-corresponding base station controller of described calling and called both sides all obtains can be used for the speech coding capacity information of this calling in its place base station sub-system according to described call identifier.
8, as claim 6 or 7 described methods, it is characterized in that,
The described speech coding capacity information source that can be used for this calling that the base station controller of described calling party's correspondence obtains is in sub-district, described calling party place and/or described calling party place adjacent cells of cells;
The described speech coding capacity information source that can be used for this calling that the base station controller of described callee's correspondence obtains is in sub-district, described callee place and/or described callee place adjacent cells of cells.
9, method as claimed in claim 6 is characterized in that,
Carry the speech coding type that sub-district, described calling party place and/or described calling party place adjacent cells of cells are supported in the described speech coding capacity information that the base station controller of described calling party's correspondence reports;
Carry the speech coding type that sub-district, described callee place and/or described callee place adjacent cells of cells are supported in the described speech coding capacity information that the base station controller of described callee's correspondence reports;
The speech coding type that described calling party and sub-district, callee place and/or described calling participant place adjacent cells of cells are supported includes: global system for mobile communications _ full-rate codes GSM_FR, global system for mobile communications _ half rate encoded GSM_HR, global system for mobile communications _ EFR coding GSM_EFR, adaptation rate _ half rate encoded AMR_HR, among adaptation rate _ full-rate codes AMR_FR or the adaptation rate _ wideband A MR_WB any one or combination in any.
10, method as claimed in claim 9 is characterized in that,
When sub-district, described calling party place and/or described calling party place adjacent cells of cells support AMR_HR, AMR_FR or AMR_WB, also comprise the rate information of AMR coding in the described speech coding capacity information that the base station controller of described calling party's correspondence reports;
When sub-district, described callee place and/or described callee place adjacent cells of cells support AMR_HR, AMR_FR or AMR_WB, also comprise the rate information of AMR coding in the described speech coding capacity information that the base station controller of described callee's correspondence reports.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013097090A1 (en) * | 2011-12-27 | 2013-07-04 | 华为技术有限公司 | Codec negotiation method and device |
| WO2016090941A1 (en) * | 2014-12-10 | 2016-06-16 | 中兴通讯股份有限公司 | Trunking service establishment method and system, and storage medium |
| CN110636462A (en) * | 2019-09-27 | 2019-12-31 | 中国电子科技集团公司第五十四研究所 | Voice rate negotiation method and device in satellite mobile communication system |
| CN111757276A (en) * | 2019-03-26 | 2020-10-09 | 成都鼎桥通信技术有限公司 | Voice format notification method and device |
| CN113891390A (en) * | 2016-03-28 | 2022-01-04 | 松下电器（美国）知识产权公司 | Terminal, base station and codec mode switching method |
| WO2023184383A1 (en) * | 2022-03-31 | 2023-10-05 | 北京小米移动软件有限公司 | Capability determination method and apparatus, and capability reporting method and apparatus, and device and storage medium |
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| CN101031006B (en) * | 2006-03-03 | 2010-08-25 | 华为技术有限公司 | Sink-bureau multi-service transmitting method based on IP |
| CN100456893C (en) * | 2006-09-30 | 2009-01-28 | 华为技术有限公司 | Load-supporting method and system for voice data |
| CN101163286B (en) * | 2007-11-08 | 2011-11-30 | 中兴通讯股份有限公司 | Method of implementing voice coding/decoding capability interaction between wireless network and core network |
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2008
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013097090A1 (en) * | 2011-12-27 | 2013-07-04 | 华为技术有限公司 | Codec negotiation method and device |
| WO2016090941A1 (en) * | 2014-12-10 | 2016-06-16 | 中兴通讯股份有限公司 | Trunking service establishment method and system, and storage medium |
| CN113891390A (en) * | 2016-03-28 | 2022-01-04 | 松下电器（美国）知识产权公司 | Terminal, base station and codec mode switching method |
| CN113891390B (en) * | 2016-03-28 | 2023-09-22 | 松下电器（美国）知识产权公司 | Terminal, base station and codec mode switching method |
| CN111757276A (en) * | 2019-03-26 | 2020-10-09 | 成都鼎桥通信技术有限公司 | Voice format notification method and device |
| CN111757276B (en) * | 2019-03-26 | 2022-04-19 | 成都鼎桥通信技术有限公司 | Voice format notification method and device |
| CN110636462A (en) * | 2019-09-27 | 2019-12-31 | 中国电子科技集团公司第五十四研究所 | Voice rate negotiation method and device in satellite mobile communication system |
| WO2023184383A1 (en) * | 2022-03-31 | 2023-10-05 | 北京小米移动软件有限公司 | Capability determination method and apparatus, and capability reporting method and apparatus, and device and storage medium |
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