WO2008141573A1 - A data transmittiing method and communication system, base station controller and media gateway - Google Patents

Abstract

A data transmitting method and communication system, base station controller and media gateway. The data transmitting method comprises: the meida gateway receives RTP packet sent by the base station controller; the meida gateway processes the packet to get the data in G.711 format of 64kbps; the media gateway sends the data in G.711 format to an Inter Working Founction.

Description

 Data transmission method and communication system 1⁄2 station controller and media gateway The application is submitted to the Chinese Patent Office on May 18, 2007, and the application number is 200710107966.5, and the invention name is "a data transmission method and communication system and base station control". And the media gateway" Chinese patent application priority, and November 7, 2007 submitted to the Chinese Patent Office, application number 200710166118.1, the invention name is "a data transmission method and communication system and base station controller and media gateway" The priority of the Chinese Patent Application is hereby incorporated by reference in its entirety in its entirety herein in its entirety in its entirety.

Technical field

 The present invention relates to the field of communications, and in particular, to a data transmission method, a communication system, a base station controller, and a media gateway.

Background technique

 In the data service based on the Global System for Mobile Communications (GSM), a data transmission method in the prior art is:

 The A interface is a 64Kbps Time Division Multiplex (TDM) time slot. When the call is a data service call (CS, Circuit Switched), the base station controller (BSC, Base Station Controller) receives the data frame of the base transceiver station (BTS, Base Transceiver Station).

 Referring to FIG. 1, the following is a cross-transformation and rate adaptation unit (TRAU), which is a 72-bit Vl in a TRAU frame. 10 frames are RAA adapted to 80 bit V.110 frames. The 80-bit V.l 10 frame rate adaptation 2 (RA2, Rate Adaptation 2) is adapted to 64 kbps and sent to the core network. If the core network is the core network of the R4 architecture, the BSC forwards the 64Kbps data to the Media Gateway (MGW, Media Gate Way), and the MGW hands over to the Interworking Function (IFF), and the IWF performs the Vl 10 and the wireless chain. The processing of the RLP/L2R (Radio Link Protocol/Layer 2 Relay) enables the data service of the mobile terminal to the Public Switched Telephone Network (PSTN).

 In the process of implementing the present invention, the inventors found the following drawbacks in the prior art:

In the prior art, the TDM method is used to transmit information between the BSC and the MGW, but with the number According to the development of transmission technology, Real Time Transport Protocol (RTP) has been widely used, but the prior art does not provide a solution for how to use RTP for data transmission under its network architecture.

Summary of the invention

 The technical problem to be solved by the embodiments of the present invention is to provide a data transmission method, a communication system, a base station controller, and a media gateway, which can implement the A interface IP of the GSM system.

 The data transmission method provided by the embodiment of the present invention includes: the media gateway receives the real-time transport protocol packet sent by the base station controller; the media gateway processes the packet to obtain data in the G.711 format; the media gateway uses the G. Data in the 711 format is sent to the interconnect function entity.

 The data transmission method provided by the embodiment of the present invention includes: the base station controller performs rate adaptation processing on the data frame received from the mobile terminal to obtain data in the G.711 format; and the base station controller performs data in the G.711 format. The real-time transport protocol packet is sent to the media gateway by the real-time transport protocol, and the media gateway is instructed to extract the corresponding data from the real-time transport protocol packet.

 The communication system provided by the embodiment of the present invention includes: a base station controller, configured to encapsulate a data frame received from a mobile terminal into a real-time transport protocol message and send the message; and a media gateway, configured to use the base station The packet received by the controller is processed to obtain data in the G.711 format, and the data is sent. The interconnection function entity is configured to receive the data in the G.711 format sent by the media gateway.

 The base station controller provided by the embodiment of the present invention includes: a data frame receiving unit, configured to receive a data frame from the mobile terminal, and a data frame encapsulating unit, configured to adapt the data frame to a frame after V.110 of 80 bits. The packet is a real-time transport protocol packet, and the data frame sending unit is configured to send the real-time transport protocol packet encapsulated by the data frame encapsulating unit to the media gateway.

 The base station controller provided by the embodiment of the present invention includes: a first receiving unit, configured to receive an assignment message sent by a mobile switching center, and a data frame sent by the mobile terminal; and a first data processing unit, configured to use, according to the assignment message Performing a rate adaptation process on the data frame to obtain data in the G.711 format, and encapsulating the data in the G.711 format into a real-time transport protocol message; and a first data sending unit, configured to use the real-time transport protocol The message is sent to the media gateway.

The base station controller provided by the embodiment of the present invention includes: a third data receiving unit, configured for mobile terminal a data frame sent by the terminal; a second data processing unit, configured to perform rate adaptation processing on the received data frame to obtain data in a format of G.711, and encapsulate the data in the G.711 format to obtain a real-time transmission protocol packet; And a second data sending unit, configured to send the real-time transport protocol message to the media gateway by using a real-time transport protocol.

 The media gateway provided by the embodiment of the present invention includes: a data receiving unit, a data adapting unit, and a data forwarding unit; the data receiving unit is configured to receive a real-time transport protocol sent by the base station controller to report data in a format of G.711; The data forwarding unit is configured to forward the adapted data in the G.711 format to the interconnecting functional entity.

 The media gateway provided by the embodiment of the present invention includes: a second data receiving unit, configured to receive a real-time transport protocol packet that is sent by the base station controller and includes G.711 format data; and a data extracting unit, configured to use the real-time transport protocol The data in the corresponding G.711 format is extracted from the message; the second data forwarding unit is configured to send the data in the G.711 format to the interconnected functional entity.

DRAWINGS

 1 is a schematic diagram of a data transmission network in the prior art;

 2 is a general flowchart of an embodiment of a data transmission method according to an embodiment of the present invention;

 FIG. 3 is a flowchart of a first embodiment of a data transmission method according to an embodiment of the present invention;

 FIG. 4 is a flowchart of a second embodiment of a data transmission method according to an embodiment of the present invention;

 FIG. 5 is a flowchart of a third embodiment of a data transmission method according to an embodiment of the present invention;

 6 is a schematic diagram of an embodiment of a communication system according to an embodiment of the present invention;

 FIG. 7 is a schematic diagram of a first embodiment of a base station controller according to an embodiment of the present invention;

 FIG. 8 is a schematic diagram of a second embodiment of a base station controller according to an embodiment of the present invention;

 FIG. 9 is a schematic diagram of a third embodiment of a base station controller according to an embodiment of the present invention;

 FIG. 10 is a schematic diagram of a first embodiment of a media gateway according to an embodiment of the present disclosure;

 FIG. 11 is a schematic diagram of a second embodiment of a media gateway according to an embodiment of the present invention.

detailed description

 The embodiments of the present invention provide a data transmission method, a communication system, a base station controller, and a media gateway, which are used to implement IP address of the A interface.

In the following embodiment, a TRAU frame is taken as an example of a data frame, and it is understood that the same It may be other similar data frames, where one TRAU frame contains 4 data frames. The following describes the processing flow of the low-speed data service. The so-called low-speed data service generally refers to the service with a transmission rate lower than 9.6 kbps. The specific processing method for the high-speed data service will be described in the following embodiments.

 Referring to FIG. 2, the overall process of the data transmission method embodiment in the embodiment of the present invention includes:

 201. The BSC encapsulates the received data frame into an RTP packet.

 The BSC receives the data frame from the mobile terminal through the BTS, and encapsulates the received data frame. The specific encapsulation process will be described in detail in the following embodiments.

 202. The BSC sends the encapsulated RTP^ message to the MGW.

 203. The MGW adapts the data frame to the 64 kbps data in the G.711 format by rate adaptation.

The MGW adapts the rate of the data frame in the received RTP packet by the rate adaptation, that is, the code change (TC, Transcoder). The specific adaptation process will be described in the following embodiments.

 204. The MGW sends the adapted data in the G.711 format to the IWF for further processing. In this embodiment, the data frame in the RTP packet sent by the BSC is adapted to the data in the G.711 format and forwarded by the MGW, thereby saving the transmission resources of the BSC to the core network, thereby improving the data transmission efficiency.

 Three embodiments are proposed below for different data frame encapsulation modes and adaptation modes:

 First, 72bits package:

 Referring to FIG. 3, a first embodiment of a data transmission method in an embodiment of the present invention includes:

 301. The BSC encapsulates the received 72-bit V.110 format data frame into RTP >3⁄4 text. The BSC receives the 72-bit V.110 format data frame sent by the mobile terminal through the BTS, and deletes the first four words in the data frame. The control bits of the section, after which the data frame is encapsulated.

In this embodiment, the current intermediate rate may be obtained before the encapsulation, where the value of the intermediate rate parameter is sent by the Mobile Switching Center Server (MSC Server) to the MGW. If the intermediate rate is 16 kbps, The BSC encapsulates four 72-bit V.110 format data frames into one RTP message. If the intermediate rate is 8 kbps, two of the four 72-bit V.110 format data frames are all ones. Invalid, the BSC encapsulates the remaining 2 valid 72-bit V.110 format data frames into an RTP message. In addition, it can be understood that the intermediate rate can also be distinguished, that is, regardless of the intermediate rate of 8 kbps or 16 kbps, the BSC encapsulates four V.110 format data frames into one RTP message.

 302. The BSC sends the encapsulated RTP^ message to the MGW.

 In this embodiment, the BSC sends the encapsulated RTP packet to the MGW through the A interface. To improve the success rate of the RTP packet transmission, multiple redundant frames can be set in the RTP packet. The description is as follows: In each RTP message, two data blocks are included. The first data block is the data block of the previous time (two or four V.110 frames), and the second data block is the data block of the current time (two or four V.110 frames). In this way, each message is redundantly sent to the previous data. Once the IP network has lost packets, the lost data can be recovered from subsequent packets. The specific format is as follows:

Table 1

 It can be understood that the specific number of redundant frames, the payload type of the RTP packet (PT, Payload Type), and the PT of each data block can be determined according to the configuration on the BSC and the MGW. It can also be delivered by the MSC Server through the H.248 and BSSAP messages of the Mc interface.

 303. The MGW adapts the 72-bit V.110 format data frame in the RTP text to the 80-bit V.110 format data frame.

 The specific adaptation process is prior art and will not be described again.

 Before the adaptation, it is also necessary to determine the number of data frames. If the intermediate rate is 16 kbps, that is, there are four V.110 format data frames in the RTP message, the direct adaptation is performed. If the intermediate rate is 8 kbps, that is, the RTP report. If there are two data frames in the V.110 format, you need to insert two invalid data frames of all 1s, and then perform the adaptation operation. The value of the intermediate rate parameter is sent by the MSC Server to the MGW.

 At the same time, the MGW can perform the necessary check operation after receiving the RTP message. If the check succeeds, the MGW will perform the adaptation. If the check fails, the RTP >3⁄4 file is discarded. The specific check operation is:

 Set the PT as the check parameter, and the PT of the data service on the A interface is a dynamic PT. The value range is

96 - 127, in order to ensure PT-based, there are the following methods:

Method 1: Configure the BSC and the MGW to ensure that the data service PT types of the BSC and the MGW are the same. Method 2: Configure the PT on the MSC to use the data service of the A interface. Then, the H.248 message of the Mc is sent to the MGW, and the PT is sent to the BSC by extending the BSSAP protocol. Therefore, the PT of the BSC and the MGW are kept consistent.

 Therefore, if the PT identified in the RTP packet received by the MGW from the BSC is consistent with the PT that is expected to be received, the check is considered to pass.

 304. The MGW adapts the 80-bit V.110 format data frame to the G.711 format data by rate adaptation.

 305. The MGW sends the adapted data in the G.711 format to the IWF for further processing. In this embodiment, the IWF processes the received data and returns it to the MGW. The MGW adapts the data in the G.711 format processed by the IWF to the 80-bit V.110 format data frame, and then adapts to the 72-bit data frame. A data frame of the V.110 format, if the intermediate rate is 16 kbps, the four 72-bit V.110 format frames are encapsulated into RTP messages and sent to the called party base station controller; if the intermediate rate value is 8 kbps, Then, the two 72-bit V.110 format frames are encapsulated into real-time transport protocol packets and sent to the called party BSC.

 After the called BSC receives the data sent by the MGW, it judges that if the intermediate rate value is 16 kbps, the received RTP message is directly processed. If the intermediate rate is 8 kbps, the received RTP is first received. Two all-one "1" invalid 72-bit V.110 format frames are inserted into the message, and then 72-bit V.110 format frames are transmitted to the PSTN network or other mobile terminals according to the user's request.

 Second, 80bits package:

 Referring to FIG. 4, a second embodiment of a data transmission method in an embodiment of the present invention includes:

 401. The BSC adapts the received 72-bit V.110 format data frame to the 80-bit V.110 format data frame.

 The BSC receives the 72-bit V.110 format data frame sent by the mobile terminal through the BTS, and

402. Encapsulate an 80-bit V.110 format data frame into an RTP packet.

In this embodiment, the current intermediate rate may be obtained before the encapsulation. The value of the intermediate rate parameter is sent by the MSC Server to the MGW. If the intermediate rate is 16 kbps, the BSC will use four 80-bit V.110 formats. The data frame is encapsulated into an RTP message. If the intermediate rate is 8 kbps, Then, in the four 80-bit V.110 format data frames, two data frames are all ones, that is, invalid, and the BSC encapsulates the remaining two valid 80-bit V.110 format data frames into one RTP message.

 In addition, it can be understood that the intermediate rate can also be separated, that is, regardless of the intermediate rate of 8 kbps or 16 kbps, the BSC encapsulates four V.110 format data frames into one RTP message.

 403. The BSC sends the encapsulated RTP file to the MGW.

 In this embodiment, the BSC sends the encapsulated RTP packet to the MGW through the A interface. To improve the success rate of the RTP packet transmission, multiple redundant frames can be set in the RTP packet. The description is as follows: In each RTP message, two data blocks are included. The first data block is the data block of the previous time (2 or 4 V.110 frames), and the second data block is the data block of the current time (2 or 4 V.110 frames). In this way, each message is redundantly sent to the previous data. Once the IP network has lost packets, the lost data can be recovered from subsequent messages.

 It can be understood that the specific number of redundant frames, the PT of the RTP message, and the PT of each data block can be determined according to the configuration on the BSC and the MGW. It can also be delivered by the MSC through the H.248 and BSSAP messages of the Mc interface.

 404. The MGW adapts, by using rate adaptation, the 80-bit V.110 format data frame in the RTP packet to the G.711 format data.

 Before the adaptation, it is also necessary to determine the number of data frames. If the intermediate rate is 16 kbps, that is, there are four V.110 format data frames in the RTP message, the direct adaptation is performed. If the intermediate rate is 8 kbps, that is, the RTP report. If there are two data frames in the V.110 format, you need to insert two invalid data frames of all 1s, and then perform the adaptation operation. The value of the intermediate rate parameter is sent by the MSC Server to the MGW.

 At the same time, the MGW can perform the necessary check operation after receiving the RTP message. If the check succeeds, the MGW will perform the adaptation. If the check fails, the RTP >3⁄4 file is discarded. The specific check operation is:

 Set the PT as the check parameter, and the PT of the data service on the A interface is a dynamic PT. The value range is

96 - 127, in order to ensure PT-based, there are the following methods:

 Method 1: Configure the BSC and the MGW to ensure that the data service PT types of the BSC and the MGW are the same.

Method 2: Configure the PT on the MSC to use the data service of the A interface. By Mc The H.248 message is sent to the MGW, and the PT is sent to the BSC by extending the BSSAP protocol. Therefore, the PT of the BSC and the MGW are kept consistent.

 Therefore, if the PT identified in the RTP packet received by the MGW from the BSC is consistent with the PT that is expected to be received, the check is considered to pass.

 405. The MGW sends the adapted data in the G.711 format to the IWF for further processing. In this embodiment, the IWF processes the received data and returns it to the MGW. The MGW adapts the data in the G.711 format processed by the IWF to the 80-bit V.110 format data frame, and then adapts to the 72-bit data frame. A data frame of the V.110 format, if the intermediate rate is 16 kbps, the four 72-bit V.110 format frames are encapsulated into RTP messages and sent to the called party base station controller; if the intermediate rate value is 8 kbps, Then, the two 72-bit V.110 format frames are encapsulated into real-time transport protocol packets and sent to the called party BSC.

 After the called BSC receives the data sent by the MGW, it judges that if the intermediate rate value is 16 kbps, the received RTP message is directly processed. If the intermediate rate is 8 kbps, the received RTP is first received. Two invalid "1" invalid 72-bit V.110 format frames are inserted into the message, and then the next processing is performed.

 Third, 63bits package

 Referring to FIG. 5, a third embodiment of a data transmission method in an embodiment of the present invention includes:

 501. The BSC adapts the received 72-bit V.110 format data frame to the 63-bit V.110 format data frame.

 The BSC receives the 72-bit V.110 format data frame sent by the mobile terminal through the BTS, and

502. Encapsulate a data frame of a V.110 format of 63 bits into an RTP packet.

 In this embodiment, the current intermediate rate may be obtained before the encapsulation, where the value of the intermediate rate parameter is sent by the MSC Server to the MGW. If the intermediate rate is 16 kbps, the BSC will have four 63-bit V.110 formats. The data frame is encapsulated into an RTP message. If the intermediate rate is 8 kbps, two of the four 63-bit V.110 format data frames are all ones, that is, invalid, and the BSC will have two valid 63 bits. The data frame of the V.110 format is encapsulated into an RTP message.

In addition, it can be understood that the intermediate rate can also be distinguished, that is, regardless of the intermediate rate of 8 kbps or 16 kbps, the BSC encapsulates four V.110 format data frames into one RTP message. 503. The BSC sends the encapsulated RTP^ message to the MGW.

 In this embodiment, the BSC sends the encapsulated RTP packet to the MGW through the A interface. To improve the success rate of the RTP packet transmission, multiple redundant frames can be set in the RTP packet. The description is as follows: In each RTP message, two data blocks are included. The first data block is the data block of the previous time (2 or 4 V.110 frames), and the second data block is the data block of the current time (2 or 4 V.110 frames). In this way, each message is redundantly sent to the previous data. Once the IP network has lost packets, the lost data can be recovered from subsequent messages.

 It can be understood that the specific number of redundant frames, the PT of the RTP message, and the PT of each data block can be determined according to the configuration on the BSC and the MGW. It can also be delivered by the MSC through the H.248 and BSSAP messages of the Mc interface.

 504. The MGW adapts the 63-bit V.110 format data frame in the RTP packet to the 80-bit V.110 format data frame by using rate adaptation.

 The specific adaptation process is prior art and will not be described again.

 Before the adaptation, the number of data frames needs to be determined. If the intermediate rate is 16 kbps, that is, there are four V.110 format data frames in the RTP message, the direct adaptation is performed. If the intermediate rate is 8 kbps, that is, in the RTP text. If there are two V.110 format data frames, you need to insert two invalid data frames that are all 1s, and then perform the adaptation operation. The value of the intermediate rate parameter is sent by the MSC Server to the MGW.

 At the same time, the MGW can perform the necessary check operation after receiving the RTP message. If the check succeeds, the MGW will perform the adaptation. If the check fails, the RTP >3⁄4 file is discarded. The specific check operation is:

 Set the PT as the check parameter, and the PT of the data service on the A interface is a dynamic PT, which ranges from 96 to 127. To ensure PT-saturation, the following methods are available:

 Method 1: Configure the BSC and the MGW to ensure that the data service PT types of the BSC and the MGW are the same.

 Method 2: Configure the PT on the MSC to use the data service of the A interface. Then, the H.248 message of the Mc is sent to the MGW, and the PT is delivered to the BSC by extending the BSSAP protocol. This ensures that the PTs of the BSC and the MGW are consistent.

Therefore, if the PT identified in the RTP message received by the MGW from the BSC is expected to be received PT--, the verification is passed.

 505. The MGW adapts the data frame of the 80 bits V.110 format to the data of the G.711 format.

506. The MGW sends the adapted data in the G.711 format to the IWF for further processing. In this embodiment, the IWF processes the received data and returns it to the MGW. The MGW adapts the data in the G.711 format processed by the IWF to the 80-bit V.110 format data frame, and then adapts to the 72-bit V-frame. A data frame of the .110 format, if the intermediate rate value is 16 kbps, encapsulates four 72-bit V.110 format frames into RTP messages and sends them to the called party base station controller; if the intermediate rate value is 8 kbps, The two 72-bit V.110 format frames are encapsulated into real-time transport protocol packets and sent to the called party BSC.

 The called BSC judges after receiving the data sent by the MGW, if the intermediate rate is

16kbps, the next step is to directly process the received RTP message. If the intermediate rate is 8kbps, first insert two "1" invalid 72bits V.110 format into the received RTP message. Frame, then proceed to the next step.

 The process of data transmission is described in detail in the above embodiment, and can be encapsulated and adapted in various ways, thereby improving the flexibility of data transmission;

 Secondly, since the redundant frame is set in the RTP packet, the reliability of the data transmission is improved. Finally, since the RTP needs to be verified before the MGW receives the RTP packet, the security of the data transmission is improved.

 The system and apparatus in the embodiments of the present invention are described below:

 Referring to FIG. 6, an embodiment of a communication system in an embodiment of the present invention includes:

 a mobile terminal 601, a base transceiver station 602, a base station controller 603, a media gateway 604, and an interconnection function entity 605;

 The mobile terminal 601 is configured to send a data frame.

 The base transceiver station 602 is configured to receive a data frame sent by the mobile terminal and forward the data frame to the base station controller 603;

 The base station controller 603 is configured to encapsulate the data frame received from the mobile terminal into a real-time transport protocol message and send the message;

The media gateway 604 is configured to adapt data frames in the message received from the base station controller 603 to data in the G.711 format by code conversion, and send the data; The interconnect function entity 605 is configured to receive data transmitted by the media gateway 604.

 Referring to FIG. 7, the first embodiment of the base station controller in the embodiment of the present invention includes:

 a data frame receiving unit 701, a data frame encapsulating unit 702, and a data frame transmitting unit 703; the data frame receiving unit 701 is configured to receive a data frame from the mobile terminal;

 The data frame encapsulating unit 702 is configured to adapt the data frame to an 80-bit V.110 format frame, and transmit the protocol packet in real time;

 The data frame sending unit 703 is configured to send the real-time transmission protocol packet encapsulated by the data frame encapsulating unit 702 to the media gateway.

 Referring to FIG. 10, the first embodiment of the media gateway in the embodiment of the present invention includes:

 a data receiving unit 1001, a data adapting unit 1002, and a data forwarding unit 1003;

 The data receiving unit 1001 is configured to receive a real-time transport protocol packet sent by the base station controller, and the data adapting unit 1002 is configured to adapt the frame in the V.110 format in the real-time transport protocol packet to the data in the G.711 format. ;

 The data forwarding unit 1003 is configured to forward the adapted data in the G.711 format to the interconnect function entity. The technical solution described in the above embodiments is a processing scheme of data services of 9.6 kbps or less and 9.6 kbps or less, and for high-speed data services (HSCSD, High Speed Circuit Switched Data) exceeding 9.6 kbps, the following two types can be used. Way to handle:

 In the first solution, the high-speed data service and the low-speed data service are differentiated on the BSC side: The specific implementation manner is:

 The BSC obtains whether the data service is a high-speed data service or a low-speed data service according to a bearer control (BC) parameter in the MSC assignment message. For low-speed data services, the processing of the bearer plane uses the method described above.

 During the call setup process, the MSC sends an assignment message to the BSC, where the assignment message includes a BC parameter, which is used to indicate whether the current data service is a low-speed data service or a high-speed data service.

For high-speed data services, the BSC performs rate adaptation, and/or multi-channel multiplexing, and/or demultiplexing processing to obtain 64 kbps G.711 format Pulse Code Modulation (PCM) data. At this time, the BSC only needs to complete the TDM to IP format conversion, that is, the BSC uses a fixed time interval (for example: 20ms) for RTP packing, and encapsulates the G.711 format PCM data into an IP packet transmission. Give MGW.

 It can be understood that, in this embodiment, the BSC needs to perform rate adaptation processing for adapting data in different rate formats to data in the G.711 format, and multi-channel multiplexing and multi-channel demultiplexing may be performed according to actual conditions. For example, if the mobile terminal transmits multiple data frames, the BSC is required to perform multi-channel multiplexing processing. At this time, the data sent by the BSC to the mobile terminal needs corresponding multi-channel demultiplexing processing to form multi-channel data. Send to mobile terminal.

 The MGW obtains whether the data service is a high-speed data service or a low-speed data service according to the PLMN BC parameter delivered by the MSC. If it is a low-speed data service, the RAA/RA2 adaptation is performed according to the method described above to obtain the G.711 format data transmission to the IWF.

 During the call setup process, the MSC sends an endpoint operation message to the MGW, which may be a modification of the endpoint request message, or an endpoint request message, where the message carries a PLMN BC parameter, which is used to indicate that the current data service is low speed. Data services are also high-speed data services.

 If the data service type obtained by the MGW according to the PLMN BC parameter is inconsistent with the data service type corresponding to the data format received from the BSC, the received data is discarded, and the error information is reported.

 For high-speed data services, the MGW only needs to extract the payload from the RTP packet and transparently convert it to the G.711 PCM format for transmission to the IWF for processing. Of course, the MGW may not determine whether the data service type sent by the MSC is consistent with the data service type corresponding to the data format received from the BSC, and performs high-speed or low-speed processing according to the data service type delivered by the MSC.

 In the second solution, the BSC does not distinguish between the high-speed data service and the low-speed data service. In this embodiment, the A interface can be uniformly transmitted by using the PCM over IP.

 The BSC performs rate adaptation, and/or multi-channel multiplexing, and/or demultiplexing processing on the data acquired by the A interface according to the A interface signaling indication, and obtains data in the G.711 format. The BSC then performs RTP packing with a fixed time interval (for example, 20ms), and encapsulates the PCM data in the G.711 format into an IP packet and sends it to the MGW.

It can be understood that, in this embodiment, the BSC needs to perform rate adaptation processing for adapting data in different rate formats to data in the G.711 format, and multi-channel multiplexing and multi-channel demultiplexing may be performed according to actual conditions. For example, if the mobile terminal transmits multiple data frames, the BSC is required to perform multi-channel multiplexing processing. At this time, the data sent by the BSC to the mobile terminal needs corresponding multi-channel solution. The multiplexing process is performed to form multiplexed data to be delivered to the mobile terminal.

 In this embodiment, the BSC performs corresponding rate adaptation processing on data of different data service types. For example, for low-speed data services, data of different rates may be adapted to data of G.711 format according to the foregoing method. The specific method is similar and will not be described here.

 However, whether it is high-speed data service type data or low-speed data service type data, BSC will adapt the data to G.711 format data, and encapsulate it into an IP packet, which is sent to the MGW through RTP.

 According to the signaling indication of the Mc interface, the MGW learns that the call is a data service call, and the MGW extracts the data payload from the RTP packet (the rate of the payload data is 64 kbps) and converts the PCM stream converted into the TDM to the IWF for processing. This conversion process only completes the IP to TDM format conversion without the need for codec conversion and rate adjustment processing.

 In this embodiment, the data received by the MGW is data in the G.711 format, and does not need to consider data of a high-speed data service type or a low-speed data service type, directly extracts the data payload, and converts to a TDM format, and Send to IWF.

 The data in the G.711 format described in the embodiment of the present invention may not be subjected to transcoding and EC conversion, and the data rate of the G.711 format may be 64 kbps.

 The 64 kbps described in the above embodiments refers to the amount of data transmitted per second, and there are usually 50 messages per second, and the net sizes included in the 50 messages add up to 64 Kb.

 For the data transmission method under the above high-speed data service type, the corresponding communication system embodiment and related equipment embodiments are described below:

 Referring to FIG. 6, the communication system in the embodiment of the present invention includes:

 a mobile terminal 601, configured to send a data frame;

 The base station controller 602 is configured to encapsulate the data frame received from the mobile terminal 601 into a real-time transmission protocol message and send the message to the media gateway 603;

 The media gateway 603 is configured to process the packet to obtain data in the G.711 format, and exchange the data to the interconnect function entity 604 by time division multiplexing.

 The interconnection function entity 604 is configured to receive data sent by the media gateway.

 Specifically, it can be divided into the following two cases:

First, distinguish between high and low speed business: The second embodiment of the communication system in the embodiment of the present invention includes: a mobile terminal 601, configured to send a data frame;

 The base transceiver station 602 is configured to receive a data frame sent by the mobile terminal and forward the data frame to the base station controller 603.

 The base station controller 603 is configured to receive an assignment message sent by the mobile switching center and a data frame sent by the base transceiver station 602, and determine, according to the assignment message, whether the current data service is a high-speed data service, and if yes, perform a rate on the data frame. The data in the G.711 format is obtained by the matching and/or multi-channel multiplexing and/or the multi-channel demultiplexing process, and the data in the G.711 format is encapsulated into a real-time transmission protocol message, such as an IP packet, and the real-time transmission protocol is used. The real-time transport protocol message is sent to the media gateway 604;

 The media gateway 604 is configured to extract corresponding data from the real-time transport protocol message, perform time division multiplexing processing on the data, and send the processed data to the interconnect function entity 605;

 The interconnect function entity 605 is configured to receive data sent by the media gateway 604.

 In this embodiment, the base station controller 603 needs to perform rate adaptation processing for adapting data in different rate formats to data in the G.711 format, and multi-channel multiplexing and multi-channel demultiplexing may be selected according to actual conditions. For example, if the mobile terminal 601 transmits multiple data frames, the base station controller 603 is required to perform multi-channel multiplexing processing. At this time, the data sent by the base station controller 603 to the mobile terminal 601 needs to be multi-channel demultiplexed. The multiplexed data is sent to the mobile terminal 601.

 In this embodiment, the base station controller 603 needs to determine whether the current service is a high-speed data service or a low-speed data service. If the high-speed data service is a high-speed data service, the base station controller 603 performs the above-mentioned manner. If the data is a low-speed data service, the low-speed data mentioned in the previous embodiment is used. The business processing method is processed.

 It should be noted that the RTP packet in this embodiment may be an IP packet or other types of data packets, as long as the RTP protocol can be satisfied.

 Second, do not distinguish between high and low speed business:

 Referring to FIG. 6, the third embodiment of the communication system in the embodiment of the present invention includes:

 a mobile terminal 601, configured to send a data frame;

 The base transceiver station 602 is configured to receive a data frame sent by the mobile terminal and forward the data frame to the base station controller 603.

The base station controller 603 is configured to perform rate adaptation and/or multi-channel multiplexing and/or multi-channel demultiplexing processing on the data frames received from the base transceiver station 602 to obtain data in the G.711 format, for G.711. Grid The data is encapsulated to obtain a real-time transport protocol message, and the real-time transport protocol message is sent to the media gateway 604 through a real-time transport protocol;

 The media gateway 604 is configured to extract corresponding data from the real-time transport protocol message, perform time division multiplexing processing on the data, and send the processed data to the interconnect function entity 605;

 The interconnect function entity 605 is configured to receive data sent by the media gateway 604.

 In this embodiment, the base station controller 603 needs to perform rate adaptation processing for adapting data in different rate formats to data in the G.711 format, and multi-channel multiplexing and multi-channel demultiplexing may be selected according to actual conditions. For example, if the mobile terminal 601 transmits multiple data frames, the base station controller 603 is required to perform multi-channel multiplexing processing. At this time, the data sent by the base station controller 603 to the mobile terminal 601 needs to be multi-channel demultiplexed. The multiplexed data is sent to the mobile terminal 601.

 In this embodiment, the base station controller 603 does not need to determine whether the current service is a high-speed data service or a low-speed data service, and directly adapts the data frame to the data in the G.711 format for further processing.

 The first embodiment of the present invention includes: a first receiving unit 801, which receives an assignment message sent by a mobile switching center and a data frame sent by the mobile terminal;

 a data service check unit 802, configured to determine, according to the assignment message, whether the current data service is a high-speed data service;

 The first data processing unit 803 is configured to perform rate adaptation and/or multi-channel multiplexing and/or multi-channel demultiplexing processing on the data frame to obtain data in a G.711 format when the current data service is a high-speed data service. Encapsulating the data in the G.711 format into a real-time transport protocol message;

 The first data sending unit 804 is configured to send the real-time transport protocol message to the media gateway by using a real-time transport protocol.

 Referring to FIG. 9, the third embodiment of the base station controller in the embodiment of the present invention includes:

 a third data receiving unit 901, configured to receive a data frame sent by the mobile terminal;

 a second data processing unit 902, configured to perform rate adaptation and/or multi-channel multiplexing and/or multi-channel demultiplexing processing on the received data frame to obtain data in a G.711 format, in the G.711 format. Data is encapsulated to obtain a real-time transport protocol message;

The second data sending unit 903 is configured to send the real-time transport protocol message to the media gateway by using a real-time transport protocol. Correspondingly, referring to FIG. 11, the second embodiment of the media gateway in the embodiment of the present invention includes: a second data receiving unit 1101, configured to receive a real-time transport protocol packet that is sent by the base station controller and includes G.711 format data;

 The data extracting unit 1102 is configured to extract corresponding data in the G.711 format from the real-time transport protocol packet.

 a second data adaptation unit 1103, configured to perform time division multiplexing processing on the data in the G.711 format;

 The second data forwarding unit 1104 is configured to send the processed data to the interconnected functional entity. The media gateway embodiment described above can be applied to the case of not distinguishing between the high-speed data service and the low-speed data service. It can be understood that if the high-speed data service and the low-speed data service need to be distinguished, the media gateway also needs to include:

 The service processing unit 1105 is configured to determine, according to the endpoint operation request received from the mobile switching center when the call is established, whether the current data service is a high-speed data service, and if yes, perform the step of extracting corresponding data from the real-time transport protocol message. .

 In the case of the service processing unit 1105, the specific processing flow is: the second data receiving unit 1101 receives the IP packet, and the service processing unit 1105 determines the current data service type according to the endpoint operation request sent by the mobile switching center, and according to Different data service types extract corresponding data from the IP packet and send it to the second data adaptation unit 1103 for subsequent processing.

 It will be understood by those skilled in the art that all or part of the steps of implementing the foregoing embodiments may be performed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. , including the following steps:

 The media gateway receives the real-time transport protocol packet sent by the base station controller;

 The media gateway processes the packet to obtain 64 kbps data in G.711 format; the media gateway sends the data in the G.711 format to the interconnect function entity.

 The above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

 As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages:

In the embodiment of the present invention, the MTC can receive the RTP packet sent by the BSC, so that the RPC-based data can be transmitted between the BSC and the MGW, so that the IP of the A interface can be implemented to meet the network development needs and improve the data transmission efficiency. Secondly, since the MGW can adapt the data frame in the RTP message sent by the BSC to the 64 kbps G.711 format data and forward it, the data rate in the RTP message sent by the BSC to the MGW can be lower than 64 kbps, so Save BSC to the core network transmission resources.

 The data transmission method, the communication system, the base station controller, and the media gateway provided by the embodiments of the present invention are described in detail. According to the idea of the embodiment of the present invention, there are changes in specific implementation manners and application scopes. In conclusion, the contents of this specification are not to be construed as limiting the invention.

Claims

Rights request  A data transmission method, comprising:  The media gateway receives the real-time transport protocol packet sent by the base station controller;  The media gateway processes the packet to obtain data in the G.711 format;  The media gateway sends the data in the G.711 format to the interconnected functional entity.  The method according to claim 1, wherein the step of the media gateway receiving the real-time transport protocol packet sent by the base station controller comprises:  The base station controller encapsulates the data frame received from the mobile terminal into a real-time transport protocol message.  The method according to claim 2, wherein the step of the media gateway processing the packet to obtain data in the G.711 format comprises:  The media gateway adapts the data frame in the message to data in the G.711 format by rate adaptation. The method according to claim 3, wherein the step of the base station controller encapsulating the data frame received by the mobile terminal into a real-time transport protocol message comprises:  The base station controller encapsulates the 72-bit V.110 format frame in the received data frame into a real-time transport protocol message;  The step of the media gateway adapting the data frame in the packet to the data in the G.711 format by rate adaptation includes:  The media gateway adapts the 72-bit V.110 format frame to the 80-bit V.110 format frame by rate adaptation;  The 80 bits V.110 format frame is adapted to the G.711 format data.  The method according to claim 3, wherein the step of the base station controller encapsulating the data frame received by the mobile terminal into a real-time transport protocol message comprises:  The base station controller adapts the 72-bit V.110 format frame in the received data frame to the 80-bit V.110 format frame;  Encapsulate 80-bit V.110 format frames into a real-time transport protocol packet;  The step of the media gateway adapting the data frame in the packet to the data in the G.711 format by rate adaptation includes: The media gateway adapts the 80-bit V.110 format frame to the G.711 format data by rate adaptation. The method according to claim 3, wherein the step of the base station controller encapsulating the data frame received by the mobile terminal into a real-time transport protocol message comprises:  The base station controller adapts the 72-bit V.110 format frame in the received data frame to the 63-bit V.110 format frame;  Encapsulate a 63-bit V.110 format frame into a real-time transport protocol packet;  The step of the media gateway adapting the data frame in the packet to the data in the G.711 format by rate adaptation includes:  The media gateway adapts the 63-bit V.110 format frame to the 80-bit V.110 format frame by rate adaptation;  The 80 bits V.110 format frame is adapted to the G.711 format data.  The method according to claim 4, 5 or 6, wherein the step of the base station controller to encapsulate the data frame received from the mobile terminal into a real-time transport protocol message comprises:  If the value of the intermediate rate is 8 kbps, the base station controller encapsulates two frames of the V.110 format into real-time transport protocol packets;  If the value of the intermediate rate is 16 kbps, the base station controller encapsulates four V.110 format frames into real-time transport protocol packets;  When the value of the intermediate rate is 8 kbps, the media gateway adapts the data frame in the message to the data in the G.711 format by rate adaptation, including:  The media gateway inserts two all-invalid V.110 format frames in the received V.110 format frame;  The resulting four V.110 format frames are adapted to the G.711 format data.  The method according to claim 7, wherein the step of adapting the data frame in the packet to the data in the G.711 format by the rate adaptation by the media gateway comprises:  The media gateway verifies the real-time transport protocol packet. If the check is passed, the media gateway performs the step of adapting the data frame in the packet to the G.711 format data by rate adaptation. If yes, the real-time transport protocol packet is discarded.  The method according to claim 8, wherein the step of verifying, by the media gateway, the real-time transport protocol packet comprises: The media gateway determines whether the load type parameter in the received real-time transport protocol packet is sent or not. The load type parameters set in the base station controller of the real-time transport protocol packet are consistent. If they are consistent, the check is determined to pass.  The method according to claim 4, 5 or 6, wherein the step of the media gateway transmitting the data to the interconnecting functional entity comprises:  The media gateway adapts the data in the G.711 format sent by the interconnection function entity to the 80-bit or 63-bit or 72-bit V.110 format frame;  If the value of the intermediate rate is 16 kbps, four 80-bit or 63-bit or 72-bit V.110 format frames are encapsulated into real-time transport protocol packets and sent to the called party base station controller;  If the value of the intermediate rate is 8 kbps, two 80-bit or 63-bit or 72-bit V.110 format frames are encapsulated into real-time transport protocol packets and sent to the called party base station controller.  The method according to claim 2, wherein the step of the base station controller encapsulating the data frame received by the mobile terminal into a real-time transport protocol message comprises:  The base station controller performs rate adaptation processing on the data frame received from the mobile terminal to obtain data in the G.711 format;  Encapsulating the data in the G.711 format to obtain a real-time transport protocol message.  The method according to claim 11, wherein the step of the media gateway processing the message to obtain data in the G.711 format comprises:  The media gateway extracts data in the G.711 format from the real-time transport protocol message.  13. A data transmission method, comprising:  The base station controller performs rate adaptation processing on the data frame received from the mobile terminal to obtain data in the G.711 format;  The base station controller encapsulates the data in the G.711 format to obtain a real-time transport protocol packet, and sends the packet to the media gateway by using a real-time transport protocol, instructing the media gateway to extract corresponding data from the packet. .  The method according to claim 13, wherein the method further comprises: the media gateway extracting corresponding data from the message, performing time division multiplexing processing on the data, and processing the processed data. Send to the interconnect function entity. The method according to claim 13 or 14, wherein the base station controller performs rate adaptation processing on the data frame received from the mobile terminal before obtaining the data in the G.711 format. Includes:  Receiving, by the base station controller, an assignment message sent by the mobile switching center;  And determining, according to the assignment message, whether the current data service is a high-speed data service, and if yes, performing rate adaptation processing on the data frame received from the mobile terminal to obtain data in the G.711 format.  The method according to claim 15, wherein the step of the media gateway extracting the corresponding data from the real-time transport protocol message comprises:  The media gateway determines whether the current data service is a high speed data service based on the endpoint operation request received from the mobile switching center at the time of call setup, and if so, performs the step of extracting the corresponding data from the message.  17. A communication system, comprising:  a base station controller, configured to encapsulate a data frame received from the mobile terminal into a real-time transport protocol message and send the message;  a media gateway, configured to process a message received from the base station controller to obtain G.711 format data, and send the data;  An interconnection function entity, configured to receive data in the G.711 format sent by the media gateway.  The communication system according to claim 17, wherein the communication system further comprises:  The base transceiver station is configured to receive a data frame sent by the mobile terminal and forward the data frame to the base station controller.  19. A base station controller, comprising:  a data frame receiving unit, configured to receive a data frame from the mobile terminal;  a data frame encapsulating unit, configured to adapt the data frame to an 80-bit V.110 format frame, or a 72-bit V.110 format frame or a 63-bit V.110 format frame, and The frame is encapsulated into a real-time transport protocol message;  And a data frame sending unit, configured to send the real-time transport protocol packet encapsulated by the data frame encapsulating unit to the media gateway.  20. A base station controller, comprising: a first receiving unit, configured to receive an assignment message sent by the mobile switching center and a data frame sent by the mobile terminal; a first data processing unit, configured to perform rate adaptation processing on the data frame to obtain data in a format of G.711, and encapsulate the data in the G.711 format into a real-time transport protocol packet;  And a first data sending unit, configured to send the real-time transport protocol message to the media gateway by using a real-time transport protocol.  The base station controller according to claim 20, wherein the base station controller further comprises:  And a data service check unit, configured to determine, according to the assignment message, whether the current data service is a high-speed data service, and when the current data service is a high-speed data service, instructing the first data processing unit to perform rate adaptation.  22. A base station controller, comprising:  a third data receiving unit, configured to send a data frame by the mobile terminal;  a second data processing unit, configured to perform rate adaptation processing on the received data frame to obtain G.711 format data, and encapsulate the G.711 format data to obtain a real-time transmission protocol packet;  And a second data sending unit, configured to send the real-time transport protocol message to the media gateway by using a real-time transport protocol.  23. A media gateway, comprising:  a data receiving unit, a data adapting unit, and a data forwarding unit;  The data receiving unit is configured to receive a real-time transport protocol message sent by the base station controller; to data in a format of G.711;  The data forwarding unit is configured to forward the adapted data in the G.711 format to the interconnecting functional entity. 24. A media gateway, comprising:  a second data receiving unit, configured to receive a real-time transport protocol packet that is sent by the base station controller and includes G.711 format data;  a data extracting unit, configured to extract corresponding data in a G.711 format from the real-time transport protocol message;  And a second data forwarding unit, configured to send the data in the G.711 format to an interconnected functional entity. The media gateway according to claim 24, wherein the media gateway further comprises: And a second data adaptation unit, configured to perform time division multiplexing processing on the data in the G.711 format, and instruct the second data forwarding unit to send the data that is subjected to time division multiplexing processing.  The media gateway according to claim 25, wherein the media gateway further comprises:  And a service processing unit, configured to determine, according to the endpoint operation request received from the mobile switching center when the call is established, whether the current data service is a high-speed data service, and if yes, perform the step of extracting corresponding data from the real-time transport protocol message.