CN1960524A - Interactive method of voice transmission and call signal in code division multiple access digital cluster system - Google Patents
Interactive method of voice transmission and call signal in code division multiple access digital cluster system Download PDFInfo
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- CN1960524A CN1960524A CN 200510112363 CN200510112363A CN1960524A CN 1960524 A CN1960524 A CN 1960524A CN 200510112363 CN200510112363 CN 200510112363 CN 200510112363 A CN200510112363 A CN 200510112363A CN 1960524 A CN1960524 A CN 1960524A
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Abstract
The method improves the voice transmission efficiency of CDMA digital trunking system. In the invention, the layers of service plane protocol is simplified; the PPP layer is removed from the service plane protocol stack, and only voice packets are transmitted between PCF and PTT server by using UDP form, and the voice information is transmitted between BSS and MS by using digital voice signals; in the interaction process of call signaling, the process of establishing and deleting PPP link are removed.
Description
Technical field
The present invention relates to the code division multiple access digital cluster technology, particularly voice transmission method and call signaling exchange method in the code division multiple access digital cluster system.
Background technology
The Digital Clustering technology was risen in the world from the mid-90 in 20th century, had obtained having used widely and having obtained good social benefit and economic benefit.Compare with the simulation group system, digital cluster system is expected to realize the spectrum efficiency of abundanter class of business, better quality of service, better confidential nature, better connectivity and Geng Gao.To the Digital Clustering transition, is the inexorable trend of historical development from the simulation cluster.
At present, code division multiple access (Code Division Multiple Access is called for short " CDMA ") digital cluster system is the method that realizes the Digital Clustering business on cdma system.
A cdma system is by travelling carriage (Mobile Station, abbreviation " MS "), base station transceiver (Base Transceiver Station, abbreviation " BTS "), base station controller (Base StationController, abbreviation " BSC "), mobile switch, Packet Control Function (Packet Control Function, be called for short " PCF ") and packet data serving node part compositions such as (Packet Data Serving Node are called for short " PDSN ").
Wherein, all adopt internetworking agreement (Internet Protocol is called for short " IP ") carrying between BSC or PCF and PDSN and between PDSN and external network.
PDSN be responsible for to set up in CDMA 1x system packet domain and terminating point end-to-end protocol (EEP) (Point toPoint Protocol is called for short " PPP ") connection, distributes the node of work such as dynamic address for the simple IP user.
And all BTS of BSC and subordinate are collectively referred to as base station sub-system (Base StationSubsystem is called for short " BSS ").One of critical function of BSS is holding frequency and time standard, and working in coordination with of deadline and frequency provides the necessary frequency reference of system, accurate timing, synchronous base and system clock.
Specifically, BSC is control and the administrative section of BSS, is positioned between mobile services switching centre (Mobile Switch Center is called for short " MSC ") and the BTS; BTS is the wireless portion of BSS, is controlled by BSC.
In cdma system, introduce the PoC (Push-to-Talk Over Cellular is called for short " PoC ") that the PPP voice communication service is based on Cellular Networks, be commonly called as Push to talk over Cellular.
PoC (Push To Talk is called for short " PTT "), " PTT " that also promptly is commonly called as is with there being the MS of corresponding function to use as intercom, is a kind of half-duplex communication mode.This MS has individual intercommunication key, after the user presses, just can with other users or group call (no matter distance is far and near, only need be positioned at the carrier network coverage).
Therefore, PoC is by the dialogue of mobile radio network, and its conversation scope no longer is confined within several kilometers, so long as in the place that the mobile network covers, just can carry out both sides' dialogue, common MS can't use the PTT function.
The Poc The Application of Technology is based on IP network simultaneously, and this business support packet voice technology (Voiceover IP is called for short " VoIP ") also is an IP telephony technology.Therefore, the MS of PTT and the difference of common MS also be, the MS of PTT can be provided with the buddy list that is similar to QQ or MSN, also a plurality of groups can be set on the interface, and state such as can the hack individual online or stealthy.Can select the someone singly to chat, also can realize talking with jointly, can also carry out complicated business such as voice SMS, family's meeting with group more than three people.
The cost of PoC is well below common speech business, and as a kind of novel mobile communication business, business revenue that it is potential and profit growth point are just receiving comprising the very big concern on operator and equipment supplier's the boundary that communicates by letter.
By Open Mobile Alliance (Open Mobile Alliance, abbreviation " OMA ") the PoC packet switch domain service of definition, be to utilize the CDMA Packet data service, be the IP grouping with the packing data after the speech coding on the MS directly, the grouping channel transfer that provides by CDMA again, packets of voice is taken out by the IP layer at receiving terminal, being submitted to decoder decode is voice signal.The PoC packet switch domain service face protocol stack of OMA as shown in Figure 1.
Among the figure, Vocoder is a VODER, RTP is RTP (RealTime TransferProtocol), UDP is User Datagram Protoco (UDP) (User Datagram Protocol), PPP is the virtual link layer protocol of multiple three layer protocols of carrying on point-to-point link, RLP3 is radio link protocol (Radio Link Protocol), MAC is media interviews controls (Medium Access Control), PHY is physical layer (Physical), R-P is R-P layer (Radio-Packet), and Link Layer is a link layer.
The voice transfer of PoC packet switch domain service and call signaling reciprocal process are as shown in Figure 2.
In step 201, MS sends the request of access to BSC.
In step 202, the BSC response request message, and allow MS to insert.
In step 203, BSC sends the compact model service request to MSC.
In step 204, the MSC response request, and send the request for allocation of Traffic Channel and link to BSC.
In step 205, BSC distribution service channel makes MS pass through this Traffic Channel communication.
In step 206, BSC also sets up A8, A9 to PCF request simultaneously and connects, wherein, the A8 transmission be between BSC and PCF customer service, A9 transmission be signaling message.A1-A11 is the important interface of CDMA 1x system.
In step 207, PCF sets up PCF and is connected with A10, A11 between PDSN, and wherein, A10 and A11 are that standard R-P interface, the A10 interface between PCF and the PDSN is used for traffic offered, A11 interface and is used for carrier signaling.
In step 208, A8, A9 that PCF sets up between PCF and the BSC connect.
In step 209, BSC notice MSC link assignment is finished.
In step 210, set up PPP between MS and the PDSN and be connected, carry out the IP registration.
In step 211, carry out the transmission of packet between MS and the PDSN.
In above-mentioned voice transfer and call signaling reciprocal process, there is special PPP to set up flow process, the voice byte stream has been coupled with PPP and IP protocol package leader will.The CDMA packet domain is transmitted with the packets of voice form by adopting ppp protocol and IP agreement, making.
In actual applications, there is following problem in such scheme: the voice transfer efficient of CDMA digital cluster system is not high.
Cause the main cause of this situation to be, in the voice transfer process, the PPP of packets of voice and IP agreement packet header occupied bandwidth are big, and link establishment process complexity.
Summary of the invention
In view of this, main purpose of the present invention is to provide voice transfer and call signaling exchange method in a kind of code division multiple access digital cluster system, makes the voice transfer efficient of CDMA digital cluster system be improved.
For achieving the above object, the invention provides voice transmission method in a kind of code division multiple access digital cluster system, comprise following steps when voice are up:
Travelling carriage is encoded into audio digital signals with up analog voice signal, is transferred to the base station by air interface;
Described base station converts the audio digital signals of receiving to packets of voice, and by packet network sends to PoC server for this packets of voice after increasing IP and udp protocol packet header by Packet Control Function.
Comprise following steps when wherein, voice are descending:
Described PoC server arrives described Packet Control Function by packet network with the UDP voice packet transfer;
Described Packet Control Function obtains packets of voice after the UDP packets of voice of receiving is removed UDP and IP agreement packet header;
Described base station is converted to audio digital signals with the packets of voice of described Packet Control Function output, and is transferred to described travelling carriage by air interface;
Described travelling carriage is decoded into analog voice signal with audio digital signals.
The present invention also provides call signaling exchange method in a kind of code division multiple access digital cluster system, comprises following steps:
Travelling carriage as call initiator sends to the PoC server with the group calling request of setting up;
Send indication to base station controller after described PoC server is received described request, this base station controller is set up conversation required connection and air traffic channels according to this indication;
After described connection and air traffic channels were set up and finished, described travelling carriage was notified described PoC server.
Wherein, the group calling request of setting up of described travelling carriage transmission is transparent to described PoC server by base station sub-system and Packet Control Function.
In this external described method, what described PoC server sent to base station controller is designated as the PoC assignment request message.
In this external described method, described PoC server sends to the PoC assignment request message of base station controller and is transmitted by Packet Control Function.
In this external described method, the required connection of described conversation comprises A1 and connects.
In this external described method, if the conversation between many people, the required connection of then described conversation also comprises A8 and connects.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, simplified the service surface protocol hierarchy, the service surface protocol stack has removed the PPP layer, only transmit the packets of voice of UDP form between PCF and ptt server, the form with audio digital signals between BSS and MS is transmitted voice messaging.
In the mutual process of call signaling, removed the process such as foundation, deletion of ppp link.
Difference on this technical scheme has brought comparatively significantly beneficial effect, promptly because removed the PPP layer, no longer needs to be encapsulated as the PPP grouping, so payload shared ratio in grouping is improved.Directly adopt digital speech code at null interface especially, do not use transmitted in packets, further improved the voice messaging ratio of actual bearer, improved voice quality, reduced demand, improved the efficient of voice transfer bandwidth.
Because removed the relevant signalling interactive process of ppp link, so shortened the link establishment time.
Because the protocol stack that MS need support is few, so can reduce requirement to the MS disposal ability.
Description of drawings
Fig. 1 is a PoC packet switch domain service face protocol stack schematic diagram in the prior art;
Fig. 2 is voice transfer and a call signaling exchange method flow chart in the CDMA digital cluster system in the prior art;
Fig. 3 is a PoC packet switch domain service face protocol stack schematic diagram among the present invention;
Fig. 4 is according to voice transmission method flow chart in the CDMA digital cluster system of first embodiment of the invention;
Fig. 5 is according to call signaling exchange method flow chart in the CDMA digital cluster system of second embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is the VoIP business of CDMA digital cluster system, by the network equipment and terminal are carried out less transformation, improves packet payload.PoC packet switch domain service face protocol stack as shown in Figure 3, wherein, Voice is a speech coding.
Compared to Figure 1, PoC packet switch domain service face protocol stack shown in Figure 3 has been simplified the service surface protocol hierarchy, specifically, the service surface protocol stack has removed the PPP layer, only transmit the packets of voice of UDP form between PCF and ptt server, the form with audio digital signals between BSS and MS is transmitted voice messaging.Therefore, in the mutual process of call signaling, removed the process such as foundation, deletion of ppp link.Because removed the PPP layer, no longer need to be encapsulated as the PPP grouping, so payload shared ratio in grouping is improved.And the protocol stack that MS need support is few, can also reduce the demand to the MS disposal ability.
Specifically, MS is encoded into audio digital signals with up analog voice signal, be transferred to BS by air interface, convert the audio digital signals of receiving to packets of voice by BS again, and send to ptt server by packet network for this packets of voice after increasing IP and udp protocol packet header by PCF.
Voice transmission method as shown in Figure 4 in the CDMA digital cluster system of first embodiment of the invention.
In step 401, by MS analog voice signal is encoded into audio digital signals, transmit upstream to BS by air interface.
In step 402, BS converts the audio digital signals of receiving to packets of voice, and sends PCF to.
In step 403, PCF increases IP and udp protocol packet header with packets of voice, and sends to ptt server.
In step 404, it is mutual that ptt server carries out call signaling, sets up conversation and connect and air traffic channels, and afterwards, ptt server is returned to PCF by packet network with the UDP packets of voice.
In step 405, PCF removes UDP and IP agreement packet header with the UDP packets of voice of receiving, obtains packets of voice, and sends BS to.
In step 406, convert packets of voice to audio digital signals by BS, by the descending MS that transfers back to of air interface, by MS this conversion of signals is become analog voice signal at last.
According to the principle of the invention, aloft interface directly adopts digital speech code, does not use transmitted in packets, has further improved the voice messaging ratio of actual bearer, has improved voice quality, has reduced the demand to bandwidth, has improved the efficient of voice transfer.
The call signaling exchange method as shown in Figure 5 in the CDMA digital cluster system of second embodiment of the invention.
In step 501, MS sends to ptt server with the group calling request of setting up, and this request is to be transparent to ptt server by BSS and PCF.
In step 502, after ptt server is received request, send the PTT assignment request message to PCF.
In step 503, PCF is transmitted to BSC with the PTT assignment request message, and BSC sets up conversation required connection and air traffic channels according to this message indication.
In step 504, BSC sets up BSC and is connected with conversation between the MSC, as the A1 that is used to transmit the signaling message between MSC and the BSC connects etc.
In step 505, if carry out conversation between many people, BSC also needs to set up BSC and is connected with A8 between the PCF; If single conversation does not then need to set up A8 and connects, can save this step.
In step 506, after connection and air traffic channels are set up and finished, finish by MS notice ptt server PTT call setup.
In call signaling reciprocal process of the present invention, removed the relevant signalling interactive process of ppp link, so the link establishment time has shortened.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. voice transmission method in the code division multiple access digital cluster system is characterized in that, comprises following steps when voice are up:
Travelling carriage is encoded into audio digital signals with up analog voice signal, is transferred to the base station by air interface;
Described base station converts the audio digital signals of receiving to packets of voice, and by packet network sends to PoC server for this packets of voice after increasing IP and udp protocol packet header by Packet Control Function.
2. voice transmission method in the code division multiple access digital cluster system according to claim 1 is characterized in that, comprises following steps when voice are descending:
Described PoC server arrives described Packet Control Function by packet network with the UDP voice packet transfer;
Described Packet Control Function obtains packets of voice after the UDP packets of voice of receiving is removed UDP and IP agreement packet header;
Described base station is converted to audio digital signals with the packets of voice of described Packet Control Function output, and is transferred to described travelling carriage by air interface;
Described travelling carriage is decoded into analog voice signal with audio digital signals.
3. call signaling exchange method in the code division multiple access digital cluster system is characterized in that, comprises following steps:
Travelling carriage as call initiator sends to the PoC server with the group calling request of setting up;
Send indication to base station controller after described PoC server is received described request, this base station controller is set up conversation required connection and air traffic channels according to this indication;
After described connection and air traffic channels were set up and finished, described travelling carriage was notified described PoC server.
4. call signaling exchange method in the code division multiple access digital cluster system according to claim 3 is characterized in that, the group calling that described travelling carriage the sends request of setting up is transparent to described PoC server by base station sub-system and Packet Control Function.
5. call signaling exchange method in the code division multiple access digital cluster system according to claim 3 is characterized in that, what described PoC server sent to base station controller is designated as the PoC assignment request message.
6. call signaling exchange method in the code division multiple access digital cluster system according to claim 5 is characterized in that, described PoC server sends to the PoC assignment request message of base station controller and transmitted by Packet Control Function.
7. according to call signaling exchange method in each described code division multiple access digital cluster system in the claim 3 to 6, it is characterized in that the required connection of described conversation comprises A1 and connects.
8. call signaling exchange method in the code division multiple access digital cluster system according to claim 7 is characterized in that, if the conversation between many people, the required connection of then described conversation also comprises A8 and connects.
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| CNB2005101123635A CN100542338C (en) | 2005-12-29 | 2005-12-29 | Voice transfer and call signaling exchange method in the code division multiple access digital cluster system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009036693A1 (en) * | 2007-09-17 | 2009-03-26 | Huawei Technologies Co., Ltd. | Method and system for processing uplink and downlink data in wireless communication network |
| WO2014180413A1 (en) * | 2013-10-09 | 2014-11-13 | 中兴通讯股份有限公司 | Mobile terminal capabilities identification method and system, and computer storage medium |
| CN104580983A (en) * | 2015-01-15 | 2015-04-29 | 深圳市捷视飞通科技有限公司 | Method for achieving video communication PTT |
-
2005
- 2005-12-29 CN CNB2005101123635A patent/CN100542338C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009036693A1 (en) * | 2007-09-17 | 2009-03-26 | Huawei Technologies Co., Ltd. | Method and system for processing uplink and downlink data in wireless communication network |
| CN101394579B (en) * | 2007-09-17 | 2012-04-25 | 华为技术有限公司 | Method and system for processing uploading downloading data in radio communication network |
| WO2014180413A1 (en) * | 2013-10-09 | 2014-11-13 | 中兴通讯股份有限公司 | Mobile terminal capabilities identification method and system, and computer storage medium |
| CN104581692A (en) * | 2013-10-09 | 2015-04-29 | 中兴通讯股份有限公司 | A method and system for identifying capability of mobile station |
| CN104581692B (en) * | 2013-10-09 | 2019-06-18 | 中兴通讯股份有限公司 | A kind of method and system identifying capacity of mobile terminal |
| CN104580983A (en) * | 2015-01-15 | 2015-04-29 | 深圳市捷视飞通科技有限公司 | Method for achieving video communication PTT |
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| CN100542338C (en) | 2009-09-16 |
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