CN101114987A - Method for implementing transmission of voice forward error correction information in CDMA2000 system - Google Patents
Method for implementing transmission of voice forward error correction information in CDMA2000 system Download PDFInfo
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- CN101114987A CN101114987A CNA2006100992801A CN200610099280A CN101114987A CN 101114987 A CN101114987 A CN 101114987A CN A2006100992801 A CNA2006100992801 A CN A2006100992801A CN 200610099280 A CN200610099280 A CN 200610099280A CN 101114987 A CN101114987 A CN 101114987A
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Abstract
The invention discloses an implementation method of transmitting speech forward error correction information to a CDMA2000 system, which solves the problem of the non-exist of the IP network transmission correction or data recovery mechanism in the prior art. A source base station and an aim base station of a session of the invention negotiate with the used speech forward error correction information; the speech forward error correction information is encapsulated in the real-time transmission protocol packet and delivers the encapsulated real-time transmission protocol packet into an end-to-end base station; the source base station or the aim base station receives and decodes the real-time transmission protocol packet; if the packet is lost, damaged or can not be decoded, then the source base station or the aim base station recovers the speech data. The method of this invention efficiently ensures the recovery of the lost speech data in the IP network transmission and solves the problem that an A1p interface can not negotiate to use forward error correction information on an A2p and the problem of the transmission of the forward error correction transmission parameters and the forward error correction information on an RTP.
Description
Technical field
The present invention relates to the method that a kind of forward error correction information transmits on the IP network of CDMA2000 system, be specifically related to voice forward error correction information and go up the method for transmission and the machinery of consultation of relevant parameter at RTP (RTP).
Background technology
Packet-based CDMA2000 BSS (Base Station Subsystem base station sub-system) can adopt IP (Internetprotocol Internet protocol) switching technology to be linked into the CDMA2000 core net of realization based on soft switch.Compare with traditional circuit domain MSS (Mobile Switching Subsystem moves switching subsystem) system, variation based on the CDMA2000 core net maximum of soft switch is to call out separating of control and carrying, replace TDM (Time DivisionMultiplexing time division multiplexing) technology with the Packet Based Network technology, traditional MSC (Mobile Switching Center mobile switching centre) network element is evolved into MSCe (Mobile Switching Center emmulation mobile switching centre simulator) and MGW (MediaGateWay media gateway), MSCe provides and calls out control and mobile management function, MGW provides media control function, and transfer resource is provided, have the Media Stream operating function.
But the forwarding that traditional IP technology can only adopt the mode of (the Best Effort) that do one's best to wrap, it only transmits in limit of power as quickly as possible, but throughput, delay, delay jitter and packet loss without any guarantee, and all being left for terminal system, are handled in transmission loss.The sending mode that this employing is done one's best once was suitable, can stand bigger delay and delay jitter because most of IP-based tradition is used (as Telnet, FTP etc.).A new generation internet must be used and the user provides the guarantee of different stage, the service quality (QoS) of realization IP network to some; Provide the service of differencing to them, the IP service provider could real profit.Be different from the access way of tradition based on TDM, IP network can provide multiple services access and management but simultaneously because the characteristic of IP packet network itself, CDMA2000 base station system based on A2p interface (the media bearer interface between MGW and the BSC) needs certain qos policy, makes its voice quality that can provide can be not less than the traditional circuit business.
The A2p interface uses RTP/UDP/IP to come the transport voice packets data.The two finishes the transport layer protocol function jointly Real-time Transport Protocol and UDP (User Datagram Protoco (UDP)), and udp protocol is a transmits data packets, no matter the time sequencing of data packet transmission.The Real-time Transport Protocol data cell divides into groups to carry with UDP, and in carrying RTP packet, frame data are divided into the several bags with identical time tag sometimes.
RTP itself can not and provide reliable transfer mechanism for transfer data packets in order, and flow control or congested control are not provided yet.Between the session of RTP, some RTCP bags of the granting in cycle are to be used for transmitting functions such as monitoring service quality and exchange session user profile.Contain the quantity of data packets that has sent, the statistics of losing such as quantity of data packets in the RTCP bag, server can utilize these information dynamically to change transmission rate, even changes PT Payload Type.
On IP network, voice quality is the realization emphasis place of whole system for voice bearer.The service voice quality mainly is subjected to the influence of four performance parameters: grouping time-delay, packet loss, shake and out of order.
Packet loss is a key factor that influences voice quality.Number-of-packet purpose difference between packet transmitting terminal and the receiving terminal is Network Transmission lost package number.Use RTP RTP transmitting audio data bag, though can utilize the sequence number of RTP heading to check losing with out of order of packet, it does not have retransmission mechanism.Any packet loss and the out of order quality that all will influence voice.
IP network transmission error correction or time data recovery mechanism there is not relevant description in the present standard agreement of 3GPP2, the voice interleave function that provides in the standard, only can make when continuous packet loss takes place, what lose is not continuous number of speech frames certificate, thereby weaken influence, interweave and to increase the end-to-end time delay of system but introduce to speech quality.
Summary of the invention
In order to overcome above-mentioned defective, the object of the present invention is to provide a kind of voice forward error correction information method by the IP network transmission in the CDMA2000 system.
For achieving the above object, the implementation method of a kind of voice forward error correction message transmission of the present invention in the CDMA2000 system comprises:
(1) Tong Hua transmit leg and recipient carry out the negotiation of voice forward error correction message transmission, and set up session according to negotiation result;
(2) transmit leg encapsulates voice forward error correction information in the RTP grouping, and the grouping of the RTP after will encapsulating sends to the recipient;
(3) recipient receives RTP grouping back and it is decoded, and as if running into packet loss, wrapping and damage situation about maybe can't resolve, then carries out the recovery of speech data.
Wherein, described step (1) is specially:
(11) Tong Hua source base station and purpose base station are set up in the process in this session, determine the coding of this session use and the bear format parameter of this session, and determine forward error correction algorithm that adopts and the relevant parameter that adopts this algorithm to consult by extension field;
(12) the RTP session is set up by finishing the negotiation of bear format and forward error correction transmission with the mobile switching centre simulator in source base station and purpose base station.
Wherein, in the described step (12), mobile switching centre's simulator judges whether its bear format with source base station and purpose base station negotiate is consistent, if consistent, then set up and exempt from a yard type conversion operations session, otherwise, set up the session of long-range sign indicating number type conversion operations.
Wherein, exempt from a yard type conversion operations session if set up, described step (2) is specially:
(21) source base station is partly filled in forward error correction information according to the payload format of determining at the extension header of RTP with speech data, be packaged into the RTP grouping then, send to media gateway by IP network, and directly pass through purpose base station, opposite end by media gateway.
Wherein, if set up the session of long-range sign indicating number type conversion operations, described step (2) is specially:
(22) source base station is partly filled in forward error correction information according to the payload format of determining at the extension header of RTP with speech data, be packaged into the RTP grouping then, send to media gateway by IP network, media gateway is carried out deblocking and code conversion to the RTP grouping of receiving, and according to source base station or/and the negotiation result of purpose base station and mobile switching centre's simulator decision additional forward error correction transmission information in the packets of voice that sends whether, be packaged into the RTP grouping again, send to purpose base station, opposite end.
Wherein, described step (3) is specially:
(31) after the RTP grouping is received in the purpose base station, solve user's face operation layer user data and handle according to payload format, obtain the speech data payload, if detect the grouping packet loss, bag damages situation about maybe can't resolve, and then utilizes forward error correction information to carry out the recovery of speech data.
Wherein, in the described step (11), described extension field comprises Extended ID, extension length and the spreading parameter in the A2p bear format parameter.
Wherein, in the A2p bear format parameter of determining in the described step (11), in extension field, increase and determine forward error correction algorithm that this session is adopted and the relevant parameter that adopts this algorithm to consult.
Wherein, in the described step (11), when the common forward error correction algorithm of supporting is adopted in source base station and purpose base station, only determine to adopt the forward error correction transfer function, specify in the extension header of forward error correction in RTP that uses when specifically transmitting.
Wherein, described source base station and purpose base station are adopted the common forward error correction algorithm of supporting to attach most importance to and are caught the method for a packet.
Wherein, described step (12) is specially: source base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the connection management business request information; Purpose base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the page-response message.
Wherein, described step (12) is specially: source base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the connection management business request information; Purpose base station and mobile switching centre's simulator are finished message by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission.
Wherein, described step (12) is specially: source base station and mobile switching centre's simulator are finished by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission in the message; Purpose base station and mobile switching centre's simulator carry the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission by page-response message.
Wherein, described step (12) is specially: source base station and purpose base station are all finished message by appointment and are carried the negotiation that A2p bear format parameter and mobile switching centre's simulator are finished bear format and forward error correction transmission.
The present invention by finishing forward error correction transmission at A1p negotiation and the description of the concrete method for packing of forward error correction information on A2p, solved the problem that forward error correction transmission parameter and forward error correction information transmit on RTP, also efficiently solve simultaneously the A1p interface and can not consult A2p and go up the problem of using forward error correction information, IP network transmission error correction or time data recovery mechanism have effectively been guaranteed voice quality in Network Transmission.
Description of drawings
Fig. 1 is A2p carrying session-level parameter schematic diagram;
Fig. 2 is A2p carrying specific format parameter schematic diagram;
Fig. 3 is 0 A2p bear format spreading parameter schematic diagram for the Extended ID in the embodiment of the invention one;
Fig. 4 is the schematic diagram that the embodiment of the invention one is supported the forward error correction information process;
Fig. 5 is the schematic diagram that the embodiment of the invention two is supported the forward error correction information process;
Fig. 6 is the schematic diagram that the embodiment of the invention three is supported the forward error correction information process;
Fig. 7 is the schematic diagram of the embodiment of the invention one forward error correction information in the RTP encapsulation;
Fig. 8 is 1 A2p bear format spreading parameter schematic diagram for the Extended ID in the embodiment of the invention two;
The method schematic diagram that Fig. 9 encapsulates at RTP for the embodiment of the invention three forward error correction informations for describing among the RFC2198;
Figure 10 is 2 A2p bear format spreading parameter field schematic diagram for the Extended ID in the embodiment of the invention three.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described again.
CDMA2000 will realize the transmission of forward error correction information on IP network, must solve the problem of two aspects:
1, to using the negotiation of forward error correction information, the transmission that makes conversation and receiving terminal know that all this session uses which kind of forward error correction algorithm and the parameter relevant with this error correction algorithm;
2, the encapsulation of forward error correction information in the RTP grouping.
The transmission method of voice forward error correction information of the present invention on the IP network of CDMA2000 system specifically comprises the steps:
(a) session is set up in the process, source base station is or/and the coding that this session is used is determined in the purpose base station, and the bear format parameter of definite this session, and (include but not limited to Extended ID in the A2p carrying specific format parameter by extension field, extension length, spreading parameter) determines to use which kind of forward error correction algorithm and relevant with this algorithm negotiation parameter that needs.
(b) source base station or/and purpose base station and the simulator MSCe of mobile switching centre finish the negotiation of bear format and set up the RTP session.
(c) source base station and purpose base station are finished the encapsulation of user's face operation layer with speech data according to the payload format of determining, and the extension header at RTP is partly filled in forward error correction information, be packaged into the RTP grouping then and send, send to the base station, opposite end by media gateway by IP network;
(d) after purpose base station and source base station are received the RTP grouping, solve user's face operation layer user data and handle according to the load lattice, obtain the speech data payload, if and detect the grouping packet loss, bag damages situation about maybe can't resolve, and just utilizes forward error correction information to carry out the recovery of speech data.
In the bear format parameter of determining in the above-mentioned steps (a), (include but not limited to Extended ID in the A2p carrying specific format parameter in extension field, extension length, spreading parameter) increases in and determine the forward error correction algorithm that this session is adopted and adopt the related parameter that has that this algorithm need consult.
Behind the forward error correction algorithm of determining in the above-mentioned steps (a), be used for error correction information can the extension header part of RTP (the extended head branch here comprise in the extension header of describing in the RTP " defined by profile " partly, the part and the extension header content part of expression extension header length) fill in.
When using the forward error correction algorithm of the common support of communicating pair, can which kind of forward error correction algorithm of uncertain employing in the above-mentioned steps (a), only determine to need to adopt the forward error correction transfer function, the forward error correction that uses during concrete transmission, " the defined by profile " part in can the extension header in RTP is specified.
In the above-mentioned steps (b), MSCe judges whether its bear format with source base station and purpose base station negotiate is consistent, if consistent, then set up and exempt from a yard type conversion operations session, otherwise, set up the session of long-range sign indicating number type conversion operations.
In the above-mentioned steps (c), if conversation type for exempting from a yard type conversion operations session, the transparent base station, opposite end of passing to of the packets of voice that comprises forward error correction information that media gateway directly sends over source base station or purpose base station; If conversation type is the session of long-range sign indicating number type conversion operations, then media gateway need be carried out deblocking and code conversion to the RTP grouping of receiving, be packaged into RTP grouping again and send to the base station, opposite end, and according to source base station or/and the decision of the negotiation result of purpose base station and the simulator MSCe of mobile switching centre whether to source base station or/and in the packets of voice that the purpose base station sends additional forward error correction transmit information.
The preferred embodiments of the present invention one:
The algorithm of forward error correction information is assumed to be the method for a packet in the basic re-transmission, so all communication terminals can both be given and support, can in extension field, not specify forward error correction algorithm, only specify and use forward error correction function, select original Extended ID=0 in the agreement for use, in the reservation position of spreading parameter, get bit3 and be used to specify use forward error correction function (as shown in Figure 3)." defined by profile " part in the extension header of the forward error correction algorithm of selecting for use in RTP identifies by profileID=1.The method for packing of the content of forward error correction algorithm in the RTP packet as shown in Figure 7.
As shown in Figure 4, source BS carries the negotiation that the A2p bearing parameter is finished bear format and forward error correction transmission by connection management business request information (Connection Management Service Request), and purpose BS carries the negotiation that the A2p bearing parameter is finished bear format and forward error correction transmission by page-response message (PagingResponse).
Present embodiment realizes that the support forward error correction information is transmitted in the method for transmitting between this source MS and the purpose MS and may further comprise the steps:
Step 101: source BS and MSCe finish the negotiation of bear format and forward error correction transmission, are specially:
(a1) portable terminal rises and exhales, source BS sends to MSCe with the bear format parameter that this BS supports in the connection management business request information, the corresponding relation that RTP load type in the A2p carrying specific format parameter (A2p Bearer Format-Specific Paramaters) of carrying and bear format ID have determined speech coding frame format and RTP load type;
If source BS determines this session and support forward error correction transmission, it is true to express support for being masked as of forward error correction transmission in Extended ID is 0 spreading parameter.
(b1) MSCe determines this session support forward error correction transmission according to bear format parameter and MGW ability that source BS sends, then sends the assignment request message that carries described bearing parameter to source BS;
(c1) after source BS receives the assignment request message that MSCe issues, the spreading parameter that is 0 subordinate according to wherein bear format and Extended ID determines that this session supports forward error correction transmission, set up corresponding channel resources and, send to assign and finish message to this MSCe with after corresponding MS consults.
Step 102:MSCe and purpose BS finish the negotiation of bear format and forward error correction transmission, are specially:
(a2) portable terminal is exhaled, and purpose BS sends to MSCe with the bear format parameter that this BS supports in page-response message, and the Extended ID in the bear format parameter is to show in 0 the spreading parameter to support the forward error correction transmission;
(b2) MSCe determines that according to bear format parameter and MGW ability that purpose BS sends this session makes support forward error correction transmission, and sends the assignment request message that carries described bearing parameter to purpose BS;
(c2) after purpose BS receives the assignment request message that MSCe issues, according to the Extended ID in the bear format wherein is that 0 spreading parameter determines that this session supports forward error correction transmission, set up corresponding channel resources and, send to assign and finish message to this MSCe with after corresponding MS consults.
Whether step 103:MSCe is consistent with the bear format that purpose BS consults according to its bear format of consulting with source BS and its, sets up corresponding conversation type: if both bear format unanimities are then set up the TrFO session, finish the TrFO calling, carry out next step; If both are inconsistent, then set up the RTO session, finish RTO and call out;
Step 104: after session is set up, source BS and purpose BS will finish the encapsulation of User Traffic layer from the speech data of eating dishes without rice or wine to receive respectively according to the payload format of determining, and forward error correction information (content can be the voice messaging of a last packets of voice) joined in the RTP extension header, be packaged into the RTP grouping then respectively, concrete encapsulation format as shown in Figure 7, profileID=1, be used to represent that this session is the known forward error correction that repeats bag data, frame number is used for representing the speech frame number of bag data, if transmit leg does not know to extend this as 0, send to MGW by IP network at last;
Step 105: if conversation type is RTO, after the RTP grouping that source BS that MGW receives and purpose BS send, the RTP grouping that receives is solved User Traffic user data, handle according to payload format then, obtain the speech data payload, after carrying out speech coding conversion by the VTC vocoder, again speech data is finished the encapsulation of User Traffic layer according to the payload format of determining, and according to source base station or/and the negotiation result of purpose base station and the simulator MSCe of mobile switching centre decision whether to source base station or/and additional forward error correction information in the packets of voice that the purpose base station sends be packaged into the RTP grouping then and send to opposite end BS by IP network;
If conversation type is TrFO, the packets of voice that MGW directly sends over purpose BS directly passes through source BS.
Step 106: source BS and purpose BS solve User Traffic user data with the RTP grouping that receives, and according to payload format processing User Traffic user data, obtain the speech data payload, if and detect the grouping packet loss, bag damages situation about maybe can't resolve, just utilize forward error correction information to carry out the recovery of speech data, send to corresponding MS then by eating dishes without rice or wine.
The preferred embodiments of the present invention two:
The algorithm of forward error correction information is assumed to be the parity check method, specifying middle finger to decide forward error correction algorithm in extension field is the parity check method, Extended ID is made as 1, the expression extend information is used for characterizing the type of forward error correction algorithm and the content of forward error correction algorithm is a method shown in Figure 7 at the method for packing of RTP packet, the spreading parameter field as shown in Figure 8, FECId=1 is defined as the parity check method.Other forward error correction algorithms can increase the definition of FECId on this basis, and other parameters relevant with algorithm need to consult if desired, can be attached in the spreading parameter field (spreading parameter can have a plurality of) of back.The method for packing of the content of forward error correction algorithm in the RTP packet is identical with preferred embodiment one.
As shown in Figure 5, source BS and purpose BS all finish message (Assignment Complete) by appointment and carry the negotiation that the A2p bearing parameter is finished bear format and forward error correction transmission, and present embodiment realizes supporting that the method that forward error correction information transmits may further comprise the steps between this MS and purpose MS:
Step 201: source BS and MSCe finish the negotiation of bear format and forward error correction transmission, are specially:
(a11) portable terminal rises and exhales, and source BS finishes in the message bear format parameter that this BS is supported in appointment and sends to MSCe, is that this session of expression uses parity check method to carry out forward error correction in 1 subordinate's the spreading parameter at Extended ID;
(b11) MSCe bear format parameter of sending according to source BS and MGW ability determine that this session support uses parity check method to carry out forward error correction, then send the bearer update request message that carries described bearing parameter to source BS;
(c11) after source BS receives the bearer update request message that MSCe issues, according to the Extended ID in the bear format parameter wherein is that 1 subordinate's spreading parameter determines that this session support uses parity check method to carry out forward error correction, set up channel resource with corresponding MS, send the bearer update response message then to MSCe.
Step 202:MSCe and purpose BS finish the negotiation of bear format and forward error correction transmission, are specially:
(a12) portable terminal is exhaled, and purpose BS finishes in the message bear format parameter that this BS is supported in appointment and sends to MSCe, is that this session of expression uses parity check method to carry out forward error correction in 1 subordinate's the spreading parameter at Extended ID;
(b12) MSCe bear format parameter of sending according to purpose BS and MGW ability determine that this session is supported in the spreading parameter that Extended ID is 1 subordinate this session of expression and uses parity check method to carry out forward error correction, and send the bearer update request message that carries described bearing parameter to purpose BS;
(c12) after purpose BS receives the bearer update request message that MSCe issues, according to the Extended ID in the bear format parameter wherein is that 1 subordinate's spreading parameter determines that this session support uses parity check method to carry out forward error correction, set up channel resource with corresponding MS, send the bearer update response message then to MSCe.
Step 203,205,206 with the step 103,105 of embodiment one, 106 corresponding consistent.
Step 204: after session is set up, source BS and purpose BS will finish the encapsulation of User Traffic layer from the speech data of eating dishes without rice or wine to receive respectively according to the payload format of determining, and forward error correction information (content is the parity information of speech data) joined in the RTP extension header, be packaged into the RTP grouping then respectively, concrete encapsulation format as shown in Figure 7, profile ID=2, be used to represent that this session is the forward error correction algorithm of parity check method, frame number is used for representing the speech frame number of bag data, if transmit leg does not know to extend this as 0, send to MGW by IP network at last;
The preferred embodiments of the present invention three:
The algorithm of the forward error correction information in the present embodiment uses and is the parity check method, specifying middle finger to decide forward error correction algorithm in extension field is the parity check method, Extended ID is made as 2, the expression extend information is used for characterizing the type of forward error correction algorithm and the content of forward error correction algorithm is the method for describing among the RFC2198 at the method for packing of RTP packet, the spreading parameter field as shown in figure 10, identifying the forward error correction algorithm that this session adopts with FECId=1 is the parity check method; RFC 2198 Payload Type are the numerical value (filling in the RFC2198 PT position in Fig. 9) of the Payload Type in the RTP head; FEC PacketData data Payload Type is the PT of the content of forward error correction information, fill in position (97 numerical value of using for example for present embodiment of the block PT=97 of Fig. 9 kind, can be other numerical value in concrete the enforcement, but require unique in this session), being used in session sign transmission content is forward error correction information.The method for packing of the content of forward error correction algorithm in the RTP packet is the method for describing among the RFC2198.
As shown in Figure 6, present embodiment realizes supporting that the method that forward error correction information transmits may further comprise the steps between this MS and purpose MS:
Step 301: source BS and MSCe finish the negotiation of bear format and forward error correction transmission, are specially:
(a13) portable terminal rises and exhales, and the bear format parameter that source BS supports this BS in the connection management business request information is sent out and is that forward error correction information is supported in this session of expression in 0 subordinate's the spreading parameter at Extended ID, gives MSCe;
(b13) MSCe determines this session support forward error correction information according to bear format parameter and MGW ability that source BS sends, then send assignment request message to source BS, but this message does not carry described bearing parameter;
(c13) after source BS receives the assignment request message that MSCe sends, send to assign to MSCe and finish message;
(d13) MSCe receive source BS send assign finish message after, carry described bear format parameter by the bearer update request message and send to source BS;
(e13) source BS receives the bearer update request message that MSCe issues, be that 0 subordinate's spreading parameter determines that this session is for supporting forward error correction information then according to the Extended ID in the bear format parameter wherein, set up corresponding channel resources and, send the bearer update response message to this MSCe with after corresponding MS consults.
Step 302:MSCe and purpose BS finish the negotiation of bear format and forward error correction transmission, are specially:
(a23) portable terminal is exhaled, and the bear format parameter that purpose BS supports this BS in page-response message and be that forward error correction information is supported in this session of expression in 0 subordinate's the spreading parameter at Extended ID sends to MSCe;
(b23) MSCe determines this session support forward error correction information according to bear format parameter and MGW ability that purpose BS sends, and sends assignment request message to purpose BS, but this message does not carry described bearing parameter;
(c23) purpose BS receive MSCe send after the assignment request message, send to assign to MSCe and finish message;
(d23) MSCe receive purpose BS send assign finish message after, carry described bear format parameter by the bearer update request message and send to purpose BS;
(e23) after purpose BS receives the bearer update request message that MSCe issues, according to the Extended ID in the bear format parameter wherein is that 0 subordinate's spreading parameter determines that this session supports forward error correction information, set up corresponding channel resources and, send the bearer update response message to this MSCe with after corresponding MS consults.
Step 303,305,306 with the step 103,105 of embodiment one, 106 corresponding consistent.
Step 304: after session is set up, source BS and purpose BS will finish the encapsulation of User Traffic layer from the speech data of eating dishes without rice or wine to receive respectively according to the payload format of determining, and forward error correction information (content is the parity information of speech data) joined (see figure 9) in the forward error correction data zone, be packaged into the RTP grouping then respectively, concrete encapsulation format sends to MGW by IP network as shown in Figure 9 at last;
The Extended ID that uses among above-mentioned all embodiment and the numerical value of spreading parameter are used for for example, but are not limited to the numerical value of other Extended ID and spreading parameter.
When source BS carries A2p bear format parameter when sending to MSCe by the connection management business request information, purpose BS also can finish message (Assignment Complete) by appointment and carry A2p bear format parameter and send to MSCe.Can be with among above-mentioned 3 embodiment, source BS and purpose BS finish bear format negotiation the mode independent assortment and obtain new embodiment, concrete condition is as follows:
1, source base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the connection management business request information; Purpose base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the page-response message.
2, source base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the connection management business request information; Purpose base station and mobile switching centre's simulator are finished by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission in the message.
3, source base station and mobile switching centre's simulator are finished by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission in the message; Purpose base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the page-response message
4, source base station and mobile switching centre's simulator are finished by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission in the message; Purpose base station and mobile switching centre's simulator are finished by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission in the message.
The present invention by finishing forward error correction transmission at A1p negotiation and the description of the concrete method for packing of forward error correction information on A2p, solved the problem that forward error correction transmission parameter and forward error correction information transmit on RTP, also efficiently solve simultaneously the A1p interface and can not consult A2p and go up the problem of using forward error correction information, IP network transmission error correction or time data recovery mechanism have effectively been guaranteed voice quality in Network Transmission.
Claims (14)
1. the implementation method of a voice forward error correction message transmission in the CDMA2000 system is characterized in that, comprising:
(1) Tong Hua transmit leg and recipient carry out the negotiation of voice forward error correction message transmission, and set up session according to negotiation result;
(2) transmit leg encapsulates voice forward error correction information in the RTP grouping, and the grouping of the RTP after will encapsulating sends to the recipient;
(3) recipient receives RTP grouping back and it is decoded, and as if running into packet loss, wrapping and damage situation about maybe can't resolve, then carries out the recovery of speech data.
2. the implementation method of voice forward error correction message transmission as claimed in claim 1 in the CDMA2000 system is characterized in that, described step (1) is specially:
(11) Tong Hua source base station and purpose base station are set up in the process in this session, determine the coding of this session use and the bear format parameter of this session, and determine forward error correction algorithm that adopts and the relevant parameter that adopts this algorithm to consult by extension field;
(12) the RTP session is set up by finishing the negotiation of bear format and forward error correction transmission with the mobile switching centre simulator in source base station and purpose base station.
3. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system, it is characterized in that, in the described step (12), mobile switching centre's simulator judges whether its bear format with source base station and purpose base station negotiate is consistent, if it is consistent, then set up and exempt from a yard type conversion operations session, otherwise, the session of long-range sign indicating number type conversion operations set up.
4. the implementation method of voice forward error correction message transmission as claimed in claim 3 in the CDMA2000 system is characterized in that, exempts from a yard type conversion operations session if set up, and described step (2) is specially:
(21) source base station is partly filled in forward error correction information according to the payload format of determining at the extension header of RTP with speech data, be packaged into the RTP grouping then, send to media gateway by IP network, and directly pass through purpose base station, opposite end by media gateway.
5. the implementation method of voice forward error correction message transmission as claimed in claim 3 in the CDMA2000 system is characterized in that, if set up the session of long-range sign indicating number type conversion operations, described step (2) is specially:
(22) source base station is partly filled in forward error correction information according to the payload format of determining at the extension header of RTP with speech data, be packaged into the RTP grouping then, send to media gateway by IP network, media gateway is carried out deblocking and code conversion to the RTP grouping of receiving, and according to source base station or/and the negotiation result of purpose base station and mobile switching centre's simulator decision additional forward error correction transmission information in the packets of voice that sends whether, be packaged into the RTP grouping again, send to purpose base station, opposite end.
6. the implementation method of voice forward error correction message transmission as claimed in claim 1 in the CDMA2000 system is characterized in that, described step (3) is specially:
(31) after the RTP grouping is received in the purpose base station, solve user's face operation layer user data and handle according to payload format, obtain the speech data payload, if detect the grouping packet loss, bag damages situation about maybe can't resolve, and then utilizes forward error correction information to carry out the recovery of speech data.
7. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system is characterized in that, in the described step (11), described extension field comprises Extended ID, extension length and the spreading parameter in the A2p bear format parameter.
8. the implementation method in the CDMA2000 system as claim 2 or 7 described voice forward error correction message transmission, it is characterized in that, in the A2p bear format parameter of determining in the described step (11), in extension field, increase and determine forward error correction algorithm that this session is adopted and the relevant parameter that adopts this algorithm to consult.
9. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system, it is characterized in that, in the described step (11), when the common forward error correction algorithm of supporting is adopted in source base station and purpose base station, only determine to adopt the forward error correction transfer function, specify in the extension header of forward error correction in RTP that uses when specifically transmitting.
10. the implementation method of voice forward error correction message transmission as claimed in claim 9 in the CDMA2000 system is characterized in that, described source base station and purpose base station are adopted the common forward error correction algorithm of supporting to attach most importance to and caught the method for a packet.
11. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system, it is characterized in that described step (12) is specially: source base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the connection management business request information; Purpose base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the page-response message.
12. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system, it is characterized in that described step (12) is specially: source base station and mobile switching centre's simulator are finished the negotiation of bear format and forward error correction transmission by carrying A2p bear format parameter in the connection management business request information; Purpose base station and mobile switching centre's simulator are finished message by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission.
13. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system, it is characterized in that described step (12) is specially: source base station and mobile switching centre's simulator are finished by appointment and are carried the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission in the message; Purpose base station and mobile switching centre's simulator carry the negotiation that A2p bear format parameter is finished bear format and forward error correction transmission by page-response message.
14. the implementation method of voice forward error correction message transmission as claimed in claim 2 in the CDMA2000 system, it is characterized in that described step (12) is specially: source base station and purpose base station are all finished message by appointment and are carried the negotiation that A2p bear format parameter and mobile switching centre's simulator are finished bear format and forward error correction transmission.
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