CN100372399C - Method for realizing group service - Google Patents
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- CN100372399C CN100372399C CNB200410091343XA CN200410091343A CN100372399C CN 100372399 C CN100372399 C CN 100372399C CN B200410091343X A CNB200410091343X A CN B200410091343XA CN 200410091343 A CN200410091343 A CN 200410091343A CN 100372399 C CN100372399 C CN 100372399C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
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- H04W84/08—Trunked mobile radio systems
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Abstract
The present invention provides a method for realizing group service, which is characterized in that the function of a control surface of a PTT server is arranged in a BCMCS controller, and a CS of the BCMCS which has the function of a user surface of the PTT server is arranged as a PSG. Group forward voice is sent in a multicast way on a BCMCS channel. Backward voice is sent in a unicast connection way on a backward service channel. Group call signals and control preemption signals are sent in a unicast connection way. The PSG only receives voice from a current speaker, and the voice is encrypted and sent to listeners through the forward channel. Thus, only members in the group can decrypt and receive the voice. The present invention is used for enabling the BCMCS service to provide the group service through the combination of the unicast service and the multicast service. The operation of the group service and the general service is realized on the same network. In addition, a null protocol and an A interface protocol are not changed at all. Only software of a client terminal and a server terminal are expanded for realizing the present invention. The prevent invention has good compatibility and the expandability.
Description
Technical field
The present invention relates to the mobile communication technology field, be meant a kind of method that realizes group service especially.
Background technology
Trunked communication system is an important branch of mobile communication system.One of trunking communication very key character adopt PTT (Push to Talk) mode to realize calling out exactly, PTT is a kind of speech business of PoC, promptly the calling party is by pinning function key, set up rapidly with called between communication link, realize calling.Wherein called can be that the individual also can be a group.
When user speech release right to speak that finishes, group member's competitive hypothesis right of speech, according to certain algorithmic dispatching right to speak, the user who obtains right to speak can talk by ptt server (PTT Server), and other member can only answer in the group.
Each related cell has a broadcast channel during calling, and current talker uses reverse link traffic channel, promptly organizes emission mode, and all hearers use broadcast channel, i.e. group receive mode.The notification message of group-calling channel configuration is gone up broadcasting at control channel (CCH).Same community user is shared a down channel.
Cdma2000 has spectrum utilization efficiency very efficiently as the 3G (Third Generation) Moblie technical standard, the professional utilance that has further improved air traffic channel of BroadCast MultiCast Service wherein (BCMCS), BCMCS system configuration schematic diagram as shown in Figure 1:
BCMCS content provider (BCMCS Provider) 101: be content source or founder.
BroadCast MultiCast Service controller (BCMCS Controller) 102: be in charge of the BCMCS session information, and give BCMCS service node (BSN) 104, be used for the base station controller/Packet Control Function (Multicast BSC/PCF) 106 of multicast, (AT) 109 that access terminal provides BCMCS session information with content server (CS, Content Server) 103.And, receive authority checking information from AAA server (AAA Server), finish broadcast access key (BAK) distribution, or finish the generation of BAK.Simultaneously, BCMCS Controller can also carry out and search expectation stream, and authentication BCMCS content provider coordinates the operations such as transmission of BCMCS content.
BCMCS content server 103: it is content source or founder not necessarily, and it is last application layer entity of being in charge of content stream.As reformatting etc., it can also store and transmit content stream, merges the content stream from a plurality of suppliers, and the encryption of finishing application layer.
BSN 104: support the logic entity of BCMCS, can with packet data serving node (PDSN) the 105th, same physical entity.This logic entity cooperates interpolation and deletion multicast IP stream with the base station controller/Packet Control Function that is used for multicast (Multicast BSC/PCF) 106, use the ip multicast agreement to manage bearer channel, as add the multicast group, withdraw from multicast group etc., carry out the multicast IP stream of BCMCS Controller appointment and handle, as head compression and deletion etc.
105 of PDSN connect the information that receive automatic network by clean culture, and send the information that receives to Unicast BSC/PCF 107.
Base transceiver station (BTS) 108 is sent to AT 109 with the information from Unicast BSC/PCF 107 and Multicast BSC/PCF 106 that receives.
Though mention Unicast BSC/PCF 106 and Multicast BSC/PCF 107 among Fig. 1, BSC/PCF supports clean culture and broadcasting simultaneously, need not mention Unicast BSC/PCF or Multicast is BSC/PCF.
Though BCMCS has air traffic channel utilization ratio very efficiently, it also is not suitable for group service.This is because the BCMCS business only is the one way traffic from the network to user, and group service is a kind of half-duplex operation mode of preempt-mode, and user's speech is promptly arranged in the group, and other member is in the state of answering.How utilizing the BCMCS business that group service is provided, realize the operation of group service and general service common network, with these characteristics of channel utilization very efficiently of good utilisation BCMCS more, is that problem to be solved is arranged.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method that realizes group service, utilize the BCMCS business that group service is provided, realize the operation of group service and general service common network.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that realizes group service, with the chain of command function setting of ptt server in BroadCast MultiCast Service controller BCMCS Controller, the BCMCS content server that has the user plane functions of ptt server is set to PSG, and access terminal with packet data serving node PDSN between set up point-to-point PPP and be connected, this method is further comprising the steps of:
A, initiate cluster multi call access terminal and BSN between set up the BCMCS bearer path, and from access network AN/PCF, obtain the information that is used to receive the forward direction voice;
The user adds group calling in b, the BCMCS controller invitation group, and the required business information of notice this group calling of PSG;
C, PSG connect the voice messaging that receives on the backward channel according to the described business information of step b by clean culture, and the applying broadcasting passage sends the forward direction voice messaging.
Preferably, be in resting state if access terminal, then this method further comprises: access terminal and BSN between set up the BCMCS bearer path in, activate clean culture and connect, set up special-purpose group calling passage; Perhaps, after the foundation of BCMCS bearer path is finished, access terminal when being ready for sending information, activate clean culture and connect, set up special-purpose group calling passage.
Preferably, step a described access terminal and BSN between set up the BCMCS bearer path process may further comprise the steps:
A1, the transmission BCMCS login request message that accesses terminal are to AN/PCF, if BCMCS flows to the bearer path of BSN and does not set up, then AN/PCF sends BCMCS streamer volume request message to BSN, set up the BCMCS bearer path, the BCMCS bearer path returns the response message that bearer path has been set up to AN/PCF, then execution in step a2 after setting up and finishing, if BCMCS flows to the bearer path of BSN and sets up, then direct execution in step a2;
A2, Access Network AN send the BCMCS bearer path to accessing terminal and have set up information.
Preferably, described the accessing terminal of step a1 sends the BCMCS login request message by the Dedicated Traffic Channel of eating dishes without rice or wine common signal channel or having set up; Described AN/PCF sends BCMCS streamer volume request message by the A interface to BSN.
Preferably, this method further comprises: before step b carries out, initiate accessing terminal of cluster multi call and obtain the BCMCS stream information of this group calling by the clean culture connection from the BCMCS controller, at self this Business Stream is monitored.
Preferably, the BCMCS stream information of described this group calling comprises, the valid expiration date of multicast IP address, port numbers, broadcast access key BAK, this key BAK, whether uses a compressed information.
Preferably, the user adds group calling in the described BCMCS controller of the step b invitation group, and notifies the process of the required business information of this group calling of PSG to be:
After the user adds group calling in the BCMCS controller invitation group, reinform the required business information of this group calling of PSG, perhaps, after the BCMCS controller is notified the required business information of this group calling of PSG, the user adds group calling in the invitation group again, perhaps, after certain customers add group calling in the BCMCS controller invitation group, reinform the required business information of this group calling of PSG.
Preferably, the required business information of described this group calling of step b comprises, the valid expiration date of unicast ip address, multicast IP address, port numbers, broadcast access key BAK, this key BAK, whether uses a compressed information.
Preferably, step c is described by the voice messaging on the clean culture reception backward channel, and the method that the applying broadcasting passage sends the forward direction voice messaging is:
PSG receives only the voice messaging of notified unicast ip address, after the use broadcast access key is encrypted this voice messaging, the voice messaging after this encryption is sent to corresponding multicast IP address and port numbers by broadcast channel.
Preferably, under cluster calling state, this method further may further comprise the steps:
D, certain accesses terminal and send the request of seizing to the BCMCS controller on clean culture connects;
After e, BCMCS controller agree that steps d is described and seize request, notice PSG upgrades current talker's unicast ip address, and connect by the forward direction clean culture and to seize accessing terminal of request to transmission and send and agree to seize request responding message, simultaneously, notify other current talker that accesses terminal except that accessing terminal of request seized in initiation in this group by forward direction clean culture connection;
C, PSG connect the voice messaging that receives on the backward channel by clean culture, and the applying broadcasting passage sends the forward direction voice messaging.
Preferably, the information that step a is described to be used to receive the forward direction voice comprises the BCMCS stream information available of indication cluster multi call correspondence, and the broadcast logical channel used of this BCMCS stream and the information of physical channel.
Preferably, described PDSN and BSN are arranged in same physical entity, and perhaps, described PDSN is arranged in different physical entities with BSN.
The present invention is provided with the chain of command function of ptt server in BCMCS Controller, the user plane functions of ptt server is set in BCMCS Content Server, and the BCMCS content server that has the user plane functions of ptt server is set to PTT Service Gateway (PSG).Cluster forward direction voice use multicast to send on the BCMCS channel, and oppositely voice use the clean culture connection to send on reverse traffic channel.The trunked call signaling with seize (Floor) control signaling and use clean culture to be connected to send.PSG receives only the voice from current talker, promptly is sign with the unicast ip address, abandons without exception from the voice messaging of other IP address.In order to prevent that non-group member from receiving, PSG carries out encrypted transmission to the forward direction speech data, has only the group member to decipher and to receive like this.Use the present invention, by unicast service is combined with multicast service, and BCMCS Controller is suitably expanded, make the BCMCS business that group service can be provided, realized group service and the operation of general service common network.And, use the present invention, air protocol and A interface protocol are not carried out any modification, only need the software of expansion client and server end can realize its compatibility and favorable expandability.
Description of drawings
Figure 1 shows that BCMCS system configuration schematic diagram;
Figure 2 shows that the structural representation when using group system of the present invention realizes group calling;
Figure 3 shows that the schematic flow sheet of the realization cluster multi call of using one embodiment of the invention;
Figure 4 shows that and use the schematic flow sheet of seizing based on realization cluster embodiment illustrated in fig. 3 of the present invention.
Embodiment
For making technical scheme of the present invention clearer, the present invention is done detailed description further again below in conjunction with accompanying drawing.
The BCMCS business is divided into two kinds of static broadcasting and dynamic broadcasts, and whether static broadcasting is to set up the BCMCS bearer path by modes such as Operation and Maintenance, no matter there is the user to monitor BCMCS flow, and this passage exists always.Dynamic broadcast is dynamically to set up and release BCMCS bearer path according to user's monitoring situation.A stream has only a bearer path, uses the ip multicast agreement to transmit in core network side, the mapping that BSN finishes multicast IP address and port numbers arrives stream ID.What the present invention used is dynamic broadcast.
Thinking of the present invention is as shown in Figure 2: the chain of command function that ptt server is set in BCMCS Controller, the user plane functions of ptt server is set in BCMCS Content Server, and the BCMCS content server that has the user plane functions of ptt server is set to PTT Service Gateway (PSG).Dotted line among the figure is represented cluster forward direction speech business stream, and dotted line is represented the reverse speech business stream of cluster, and what the solid line representative had been set up communicates to connect.Cluster forward direction voice use multicast to send on the BCMCS channel, be that PSG sends to multicast IP address and port numbers corresponding in the cluster group to the voice messaging that receives through BSN and AN/PCF, this multicast IP address and port numbers are corresponding accessing terminal in the group; Oppositely voice use clean culture to send on reverse traffic channel, and promptly talker's the voice messaging that AT sent connects through AN/PCF and PDSN arrival PSG by clean culture.The trunked call signaling with seize the control signaling and use clean culture to be connected to send.Aaa server is used for terminal is carried out authority checking.
PSG receives only the voice from current talker, promptly is sign with the unicast ip address, abandons without exception from the voice messaging of other IP address.In order to prevent that non-group member from receiving, PSG carries out encrypted transmission to the forward direction speech data, has only the group member to decipher and to receive like this.
Specify below in conjunction with flow chart.
Figure 3 shows that the schematic flow sheet of the realization cluster multi call of using one embodiment of the invention.In the present embodiment, suppose that AT1, AT2 and AT3 are the group member of same cluster group, and under same sector, wherein AT1 is the talker, and all the other are those who answer, and, all accesses terminal, be AT1, AT2 and AT3, be connected, and logical functional entity BSN and PDSN are in same physical entity by having set up point-to-point (PPP) between AN/PCF and the PDSN.In BCMCS Controller, be provided with the chain of command function of ptt server, in PSG, be provided with the user plane functions of ptt server.
Step 301, the Dedicated Traffic Channel of AT1 by eating dishes without rice or wine common signal channel or having set up sends the BCMCS login request message to AN/PCF.If BCMCS flows to the bearer path of BSN and do not set up, then execution in step 302, set up if BCMCS flows to the bearer path of BSN, then direct execution in step 304.
Step 302, AN/PCF sends the request of BCMCS streamer volume by the A interface to BSN, to set up the BCMCS bearer path.
Step 303, after BSN added the multicast group, whole bearer path was promptly set up and is finished, and returns the response message that bearer path has been set up to AN/PCF.
Step 304, AN/PCF sends the information that the BCMCS bearer path has been set up to AT1.
Step 305, AN/PCF sends broadcast multi-broadcasting Overhead Message (BCMCS Overhead) message, and the BCMCS stream of indication cluster multi call correspondence is available, and indicates broadcast logical channel and the physical channel of distributing to its application, AT1 begins to monitor corresponding broadcast channel, prepares to receive.Be that AN sends the information that is used to receive the forward direction voice to AT.
Step 306 if AT1 is in resting state, then activates clean culture and connects, and sets up special-purpose group calling passage, promptly after the foundation of BCMCS bearer path is finished, accesses terminal when being ready for sending information, activates clean culture and connects, and sets up special-purpose group calling passage.This step also can be carried out in execution in step 301.
Step 307, AT1 connects from the BCMCSController of chain of command function with ptt server by clean culture and obtains the BCMCS stream information, this Business Stream is monitored that simultaneously, the ID of this BCMCS stream is set to the ID of this cluster group to be used for self.The valid expiration date (BAK Expiry time) that comprises multicast IP address, port numbers, BAK, BAK in the above-mentioned BCMCS stream information, whether use information such as head compression.Meanwhile, the BCMCSController of chain of command function with ptt server is also by obtaining the sign of request message from the BCMCS stream information of AT1, determine that group calling is initiated in the AT1 request after, execution in step 308a.
Step 308a, 309a, the interior user of BCMCS Controller invitation group with chain of command function of ptt server adds group calling, promptly invites AT2 and AT3 to add group calling respectively.
Step 308b, 309b after AT2 and AT3 receive invitation, connects by clean culture respectively and obtains the BCMCS stream information to BCMCS Controller, is used for correctly receiving forward direction multicast stream.
Step 310, BCMCS Controller with chain of command function of ptt server sends business information to PSG, the valid expiration date (BAK Expiry time) that comprises unicast ip address, multicast IP address, port numbers, BAK, BAK in this business information, whether use information such as head compression.PSG receives only the voice messaging from notified unicast ip address, abandons without exception from the voice messaging of other IP address.According to the Different Strategies of operator, this step also can promptly be carried out before step 308 inviting the user to add preceding execution, and perhaps, this step also can have a user to add the back execution.
Step 311, AT1 sends reverse voice messaging by the clean culture connection to PSG.
Step 312, PSG uses BAK that the voice messaging that receives is encrypted, and sends forward direction encrypted speech information by broadcast channel to multicast IP address and port numbers, and this multicast IP address and port numbers are corresponding accessing terminal, i.e. AT2 and AT3 in the group.
For the foregoing description, if AT1, AT2, AT3 not under same sector, then AT1, AT2, AT3 will send request BCMCS streamer volume message respectively and set up the BCMCS bearer path.Above-mentioned BSN and PDSN also can be in same physical entities.
Figure 4 shows that and use the schematic flow sheet of seizing based on realization cluster embodiment illustrated in fig. 3 of the present invention.In the present embodiment, group call member is in conversation state.Wherein, the user of AT2 for initiating to seize.
Step 401, AT2 seizes (Floor) message to the BCMCSController of the chain of command function with ptt server transmission on clean culture connects.
Step 402 after BCMCS Controller agrees that this AT2 seizes, sends business information to PSG, only needs to upgrade current talker's unicast ip address.
Step 403, BCMCS Controller seizes response (Floor Grant) message of success to the AT2 transmission on the forward direction clean culture connects.
Step 404a, 404b, BCMCS Controller send to seize to AT1, AT3 on the forward direction clean culture connects and obtain (Floor Taken) message, the current talker of other user in the group of notifications.
Step 405, AT2 sends reverse voice messaging by the clean culture connection to PSG.
Step 406a, step 406b, PSG use BAK that the voice messaging that receives is encrypted, and send forward direction encrypted speech information by broadcast channel to AT1 and AT3.
So far, use BCMCS and realized group service, wherein, still use air protocol to transmit between AT and the AN, this air protocol does not need to make any modification.
In the present invention, the trunked call signaling with seize the control signaling and use clean culture to be connected to send,, therefore, do not having under the situation of transfer of data because the forward traffic channel of system is time-multiplexed, forward direction clean culture connection does not take resource.Oppositely clean culture connects and is used to transmit talker's voice messaging, because synchronization has only user's speech, promptly has only a reverse traffic channel in transmission, and is therefore less to the system reverse load effect.
The present invention both had been applicable to CDMA 20001X system, also was applicable to CDMA 20001XEV-DO (Data Only) system.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. method that realizes group service, it is characterized in that, with the chain of command function setting of ptt server in BroadCast MultiCast Service controller BCMCS Controller, the BCMCS content server that has the user plane functions of ptt server is set to PTT Service Gateway PSG, and access terminal with packet data serving node PDSN between set up point-to-point PPP and be connected, this method is further comprising the steps of:
A, initiate accessing terminal and support and setting up the BCMCS bearer path between the logic entity BSN of BCMCS of cluster multi call, and from access network AN/PCF, obtain the information that is used to receive the forward direction voice;
The user adds group calling in b, the BCMCS controller invitation group, and the required business information of notice this group calling of PSG;
C, PSG connect the voice messaging that receives on the backward channel according to the described business information of step b by clean culture, and the applying broadcasting passage sends the forward direction voice messaging.
2. method according to claim 1 is characterized in that, is in resting state if access terminal, and then this method further comprises: access terminal and BSN between set up the BCMCS bearer path in, activate clean culture and connect, set up special-purpose group calling passage; Perhaps, after the foundation of BCMCS bearer path is finished, access terminal when being ready for sending information, activate clean culture and connect, set up special-purpose group calling passage.
3. method according to claim 1 is characterized in that, step a is described access terminal and BSN between set up the BCMCS bearer path process may further comprise the steps:
A1, the transmission BCMCS login request message that accesses terminal are to AN/PCF, if BCMCS flows to the bearer path of BSN and does not set up, then AN/PCF sends BCMCS streamer volume request message to BSN, set up the BCMCS bearer path, the BCMCS bearer path returns the response message that bearer path has been set up to AN/PCF, then execution in step a2 after setting up and finishing, if BCMCS flows to the bearer path of BSN and sets up, then direct execution in step a2;
A2, Access Network AN send the BCMCS bearer path to accessing terminal and have set up information.
4. method according to claim 3 is characterized in that, described the accessing terminal of step a1 sends the BCMCS login request message by the Dedicated Traffic Channel of eating dishes without rice or wine common signal channel or having set up; Described AN/PCF sends BCMCS streamer volume request message by the A interface to BSN.
5. method according to claim 3, it is characterized in that, this method further comprises: before step b carries out, initiate accessing terminal of cluster multi call and obtain the BCMCS stream information of this group calling by the clean culture connection from the BCMCS controller, at self this Business Stream is monitored.
6. method according to claim 5 is characterized in that, the BCMCS stream information of described this group calling comprises, the valid expiration date of multicast IP address, port numbers, broadcast access key BAK, this key BAK, whether uses a compressed information.
7. method according to claim 1 is characterized in that, the user adds group calling in the described BCMCS controller of the step b invitation group, and notifies the process of the required business information of this group calling of PSG to be:
After the user adds group calling in the BCMCS controller invitation group, reinform the required business information of this group calling of PSG, perhaps, after the BCMCS controller is notified the required business information of this group calling of PSG, the user adds group calling in the invitation group again, perhaps, after certain customers add group calling in the BCMCS controller invitation group, reinform the required business information of this group calling of PSG.
8. according to claim 1 or 7 described methods, it is characterized in that, the required business information of described this group calling of step b comprises, the valid expiration date of unicast ip address, multicast IP address, port numbers, broadcast access key BAK, this key BAK, whether uses a compressed information.
9. method according to claim 8 is characterized in that, step c is described by the voice messaging on the clean culture reception backward channel, and the method that the applying broadcasting passage sends the forward direction voice messaging is:
PSG receives only the voice messaging of notified unicast ip address, after the use broadcast access key is encrypted this voice messaging, the voice messaging after this encryption is sent to corresponding multicast IP address and port numbers by broadcast channel.
10. method according to claim 9 is characterized in that, under cluster calling state, this method further may further comprise the steps:
D, certain accesses terminal and send the request of seizing to the BCMCS controller on clean culture connects;
After e, BCMCS controller agree that steps d is described and seize request, notice PSG upgrades current talker's unicast ip address, and connect by the forward direction clean culture and to seize accessing terminal of request to transmission and send and agree to seize request responding message, simultaneously, notify other current talker that accesses terminal except that accessing terminal of request seized in initiation in this group by forward direction clean culture connection;
C, PSG connect the voice messaging that receives on the backward channel by clean culture, and the applying broadcasting passage sends the forward direction voice messaging.
11. method according to claim 1 is characterized in that, the information that step a is described to be used to receive the forward direction voice comprises the BCMCS stream information available of indication cluster multi call correspondence, and the broadcast logical channel used of this BCMCS stream and the information of physical channel.
12. method according to claim 1 is characterized in that, described PDSN and BSN are arranged in same physical entity, and perhaps, described PDSN is arranged in different physical entities with BSN.
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| CNB200410091343XA CN100372399C (en) | 2004-11-19 | 2004-11-19 | Method for realizing group service |
| PCT/CN2005/001954 WO2006053503A1 (en) | 2004-11-19 | 2005-11-18 | Method for realizing cluster srevice |
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| CNB200410091343XA CN100372399C (en) | 2004-11-19 | 2004-11-19 | Method for realizing group service |
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| CN1780423A CN1780423A (en) | 2006-05-31 |
| CN100372399C true CN100372399C (en) | 2008-02-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101146271B (en) * | 2006-09-11 | 2010-05-19 | 中兴通讯股份有限公司 | Group high-speed data transmission method for CDMA2000 group communication system |
| CN101815249B (en) * | 2009-02-23 | 2013-01-02 | 中国电信股份有限公司 | Method and system for realizing continuity of mobile network PTT service |
| CN101938700B (en) * | 2009-06-30 | 2014-09-10 | 中兴通讯股份有限公司 | Method and system for data flow transmission in broadcast-multicast service system |
| CN101742419B (en) * | 2010-01-04 | 2012-11-14 | 中国电信股份有限公司 | Implementation method of service continuity in PTT (push to talk) group calling and PTT server |
| CN102158806B (en) | 2010-02-11 | 2012-08-08 | 华为技术有限公司 | M2M (Machine to Machine) application based session management method, system and device |
| CN102300168B (en) * | 2010-06-22 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of method and system realizing trunking communication |
| CN112203239B (en) * | 2020-10-29 | 2022-03-15 | 北京长焜科技有限公司 | Pre-established bearing management method in B-Trunc system |
| CN113316098B (en) * | 2021-04-20 | 2022-10-21 | 新华三技术有限公司 | Method for establishing service channel and public network talkback equipment |
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| US20040219940A1 (en) * | 2003-04-30 | 2004-11-04 | Dong-Koon Kong | Call setup method and system for push-to-talk service in a cellular mobile communication system |
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| Publication number | Publication date |
|---|---|
| CN1780423A (en) | 2006-05-31 |
| WO2006053503A1 (en) | 2006-05-26 |
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