CN100438656C - System and method for realizing group service - Google Patents
System and method for realizing group service Download PDFInfo
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- CN100438656C CN100438656C CNB2006100785411A CN200610078541A CN100438656C CN 100438656 C CN100438656 C CN 100438656C CN B2006100785411 A CNB2006100785411 A CN B2006100785411A CN 200610078541 A CN200610078541 A CN 200610078541A CN 100438656 C CN100438656 C CN 100438656C
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Abstract
The system comprises: one or more user end (UE) with PTT function, BSS supporting cluster service, PCF supporting cluster function and PTT server. Said UE is connected to said BSS through air interface; said BSS is connected to said PCF through standard A interface; said PCF is connected to said PTT server through PTT dedicated interface; after PTT server receives the group call establishing request from UE, it establishes the PTT service channel between BSS and PTT server; when more than one UEs interacts PTT service data with said PTT server, they shares said PTT service channel. The invention also reveals a method thereof.
Description
Technical field
The present invention relates to trunking communicating technology, particularly relate to a kind of system and method for realizing group service.
Background technology
Trunked communication system is an important branch of mobile communication system, is one of development focus of moving communicating field in recent years.A key character of trunking communication is to adopt press-and-talk (PTT, PushTo Talk) mode to call out.The PTT technology is a kind of cluster intercommunication technology, and the PTT business refers to direct-connected " point-to-point " and " putting multiple spot " Speech Communication in real time.This professional very simple half-duplex operation mode of using, promptly have only a people to talk at one time, so that colony exchanges, the calling party is as long as just can initiate conversation to a people or lineup by a button, need not dialing and wait for the other side's off-hook, particular talk group is set up in the phone demand working rapidly.Be specially adapted between team, working group, the colony collaborative work with exchange.
Early stage group service is the private network operation, and for the user provides service, operation cost is higher, so limited the development of group service.In order to promote the sizable application of group system, and further improve frequency efficiency, trunked communication system a new application trend occurred on using, professional clustering functionality promptly is provided on Digital Cellular System.By mobile communication system is transformed, make it that common duplexing call function and group service can be provided simultaneously, the user uses dual-mode terminal to realize different types of communication service, like this, on consolidated network, provide different business can reduce networking and maintenance cost, so group service just develops towards the direction of common network operation.
Press-and-talk on the existing cellular system (PoC, Push to Talk over Cellular) is based on Internet protocol (IP, the Internet Protocol) IP multimedia subsystem, IMS (IMS, IPMultimedia Subsystem) of 3GPP definition.As shown in Figure 1, this system comprises subscriber equipment (UE, UserEquipment), Access Network (AN, Access Network), IMS Core server, group and list management server (GLMS, Group and List Management Server) and PoC server.UE is connected with AN, and AN is connected with the IMS Core server with GLMS respectively, and GLMS is connected with the IMS Core server, and GLMS is connected with the PoC server, and the IMS Core server is connected with the PoC server.
This system at the protocol stack of signaling plane as shown in Figure 2, the agreement that the transmission of PoC signaling is used is that agreement (SIP, Session Initiation Protocol) is set up in session, is carried on the User Datagram Protoco (UDP) (UDPUser Datagram Protocol).Session Initiation Protocol is by the agreement of IETF (Internet engineering duty group) definition, is used to handle foundation, change and the release of Multimedia session.
This system at the protocol stack of service surface as shown in Figure 3, the agreement that the PoC service transmission is used is RTP (RTP, Real-time Transport Protocol), is carried on the UDP.
In this system, all PoC service are transparent to Access Network, PoC is that each the cluster group membership in the cluster group sets up a dedicated link, and the cluster group membership is by this dedicated link and PoC exchanges voice data, talks and listens to other cluster group membership's speech.Under the less situation of cluster group membership, the effect of this system configuration still can, still, along with being on the increase of cluster group membership, this structure of setting up dedicated link for each cluster group membership will reduce channel utilization, the data traffic of increase network, thus cause resource waste.
In addition, in this system, the agreement of PoC signaling transmission is a Session Initiation Protocol, sip message defines based on the mode of textual description, and the ratio that the overhead byte in the message accounts for is very big, causes the length of sip message very long, because the limited bandwidth of eating dishes without rice or wine, 9.6kbps is only arranged, cause the propagation delay time of each bar message all very big, cause the turn-on time of whole calling elongated.Because the signaling transfer protocol based on the system of the realization group service of IMS is a Session Initiation Protocol, expense is very big, causes channel utilization not high.Simultaneously, need after the dedicated link of bottom is set up, could send the PoC signaling, also cause the turn-on time of calling slower.And, because vocoded data carries by Real-time Transport Protocol, greatly increased the data quantity transmitted of eating dishes without rice or wine, cause the time delay of voice bigger.
Summary of the invention
Main purpose of the present invention is to provide a kind of system and method for realizing group service, improves channel utilization.
The objective of the invention is to be achieved through the following technical solutions:
A kind of system that realizes group service comprises an above user terminal, the base station sub-system BSS that supports group service with press-and-talk PTT function, Packet Control Function equipment PCF and the ptt server of supporting group service;
Described user terminal is connected by eating dishes without rice or wine with described BSS, described BSS is connected by the standard A interface with described PCF, described PCF is connected by the PTT special purpose interface with described ptt server, ptt server is after receiving the group calling foundation request that described user terminal is sent, set up the PTT Traffic Channel between BSS and the ptt server, a described above user terminal is shared this PTT Traffic Channel with the mutual PTT business datum of described ptt server the time;
Wherein, described user terminal is sent to BSS after the processing through L3 agreement, LAC agreement, MAC agreement and PHY agreement successively with the PTT signaling; The signaling that described BSS sends user terminal parses the PTT signaling after the processing through PHY agreement, MAC agreement, LAC agreement and L3 agreement successively;
Described BSS is sent to user terminal after the processing through L3 agreement, LAC agreement, MAC agreement and PHY agreement successively with the PTT signaling that PCF sends; Described user terminal parses the PTT signaling after the processing through PHY agreement, MAC agreement, LAC agreement and L3 agreement successively with the signaling that BSS sends;
Described user terminal is sent to BSS after the processing through MAC agreement, PHY agreement successively with the PTT business datum; The data that described BSS sends user terminal parse the PTT business datum after the processing through PHY agreement and MAC agreement successively;
Described BSS is sent to user terminal after the processing through MAC agreement, PHY agreement successively with the PTT business datum that PCF sends; Described user terminal parses the PTT business datum after the processing through PHY agreement and MAC agreement successively with the data that BSS sends.
Described BSS comprises interconnected base transceiver station BTS and base station controller BSC; Described BTS is connected by eating dishes without rice or wine with user terminal; Described BSC is connected by the standard A interface with PCF.
Described PTT special purpose interface comprises PTT signaling special purpose interface and PTT service-specific interface.
Described PTT signaling special purpose interface comprises CDMA trunking signal agreement Act protocol layer, tcp protocol layer, ip protocol layer, LINK protocol layer and PHY protocol layer;
Described PCF is sent to ptt server after the PTT signaling is passed through the processing of Act agreement, Transmission Control Protocol, IP agreement, LINK agreement and PHY agreement successively; Described ptt server parses the PTT signaling after the processing through PHY agreement, LINK agreement, IP agreement, Transmission Control Protocol and Act agreement successively to the signaling that PCF sends;
Described ptt server is sent to PCF after the PTT signaling is passed through the processing of Act agreement, Transmission Control Protocol, IP agreement, LINK agreement and PHY agreement successively; The signaling that described PCF sends ptt server parses the PTT signaling after the processing through PHY agreement, LINK agreement, IP agreement, Transmission Control Protocol and Act agreement successively.
Described PTT service-specific interface comprises GMP protocol layer, udp layer, ip protocol layer, LINK protocol layer and PHY protocol layer;
Described PCF is sent to ptt server after the PTT business datum is passed through the processing of GMP agreement, udp protocol, IP agreement, LINK agreement and PHY agreement successively; Described ptt server parses the PTT business datum after the processing through PHY agreement, LINK agreement, IP agreement, udp protocol and GMP agreement successively to the data that PCF sends;
Described ptt server is sent to PCF after the PTT business datum is passed through the processing of GMP agreement, udp protocol, IP agreement, LINK agreement and PHY agreement successively; The data that described PCF sends ptt server parse the PTT business datum after the processing through PHY agreement, LINK agreement, IP agreement, udp protocol and GMP agreement successively.
The PTT signaling that described BSS sends user terminal is sent to PCF after the processing through A9 agreement, Transmission Control Protocol, IP agreement, AAL5 agreement, ATM agreement and the PHY agreement of expansion successively; The signaling that described PCF sends BSS parses the PTT signaling after the processing through the A9 agreement of PHY agreement, ATM agreement, AAL5 agreement, IP agreement, Transmission Control Protocol and expansion successively;
The PTT signaling that described PCF sends ptt server is sent to BSS after the processing through A9 agreement, Transmission Control Protocol, IP agreement, AAL5 agreement, ATM agreement and the PHY agreement of expansion successively; The signaling that described BSS sends PCF parses the PTT signaling after the processing through the A9 agreement of PHY agreement, ATM agreement, AAL5 agreement, IP agreement, Transmission Control Protocol and expansion successively;
The PTT business datum that described BSS sends user terminal is sent to PCF after the processing through GRE agreement, IP agreement, AAL5 agreement, ATM agreement and PHY agreement successively; Described PCF parses the PTT business datum after the processing through PHY agreement, ATM agreement, AAL5 agreement, IP agreement and GRE agreement successively with the data that BSS sends;
The PTT business datum that described PCF sends ptt server is sent to BSS after the processing through GRE agreement, IP agreement, AAL5 agreement, ATM agreement and PHY agreement successively; Described BSS parses the PTT business datum after the processing through PHY agreement, ATM agreement, AAL5 agreement, IP agreement and GRE agreement successively with the data that PCF sends.
A kind of method that realizes group service comprises:
After a, ptt server received group calling calling party's PTT group calling foundation request, group calling calling party and the pairing shared service channel of group calling callee were set up in indication, and group calling calling party and callee become the cluster group membership;
B, cluster group membership initiate the speaking right request when speaking right is idle, ptt server sends the cluster group membership of speaking right authorization messages to this request speaking right, sends speaking right simultaneously and takies message to other all the cluster group memberships except that the cluster group membership who authorizes speaking right;
C, the cluster group membership who authorizes speaking right send speech data to ptt server by the shared service channel, and ptt server is forwarded to all cluster group memberships except that the cluster group membership who authorizes speaking right by the shared service channel with this speech data.
The group calling calling party is set up in described ptt server indication and the pairing shared service channel of callee comprises:
A1, ptt server set up under the group calling calling party shared service channel between the BSS and PCF and the shared service channel between PCF and the ptt server by the forward control channel indication;
A2, ptt server set up under the group calling callee shared service channel between the BSS and PCF and the shared service channel between PCF and the ptt server by the forward control channel indication.
Described step a1 comprises:
BSS sets up the shared service channel under the ptt server indication group calling calling party, and BSS judges whether the shared service channel between itself and the PCF is set up under the group calling calling party, if then directly forward step a2 to; Otherwise, set up under the group calling calling party shared service channel between the BSS and PCF and the shared service channel between PCF and the ptt server.
Between step a1 and a2, further comprise:
The group calling calling party sends PTT group calling foundation and finishes message to ptt server;
Ptt server sends the speaking right authorization messages to the group calling calling party.
Between step a1 and a2, further comprise:
Ptt server comprises group calling callee's information to cluster group membership transmission group information broadcast message in this message;
After the group calling callee receives this group information broadcast message, send PTT group calling foundation and ask to ptt server.
Described step a2 comprises:
BSS sets up the shared service channel under the ptt server indication group calling callee, and BSS judges whether the shared service channel between itself and the PCF is set up under the group calling callee, if then directly forward step b to; Otherwise, set up under the group calling callee shared service channel between the BSS and PCF and the shared service channel between PCF and the PTT.
After step a2, further comprise: the group calling callee adds group calling, and transmission PTT group calling foundation is finished message to ptt server.
Described step b comprises:
One cluster group membership initiates the speaking right request by BSS under it to ptt server when speaking right is idle;
Ptt server sends the speaking right authorization messages by BSS under this cluster group membership to this cluster group membership, and BSS sends speaking right respectively and takies message under other clusters group membership simultaneously;
BSS takies speaking right message respectively and is sent to other corresponding cluster group memberships under other clusters group membership.
Described step c comprises:
The cluster group membership who authorizes speaking right sends speech data by shared service channel between BSS under it and the PCF and the shared service channel between PCF and the ptt server to ptt server;
Ptt server with the speech data that receives by the shared service channel distribution between the BSS under the shared service channel between itself and the PCF and PCF and other clusters group membership to BSS under other clusters group membership;
BSS is sent to speech data other corresponding cluster group memberships respectively under other clusters group membership.
By above technical scheme as can be seen, in realizing the process of group service, shared service channel between BSS and the PCF, between PCF and the ptt server, the cluster group membership is by this Traffic Channel and ptt server interaction data of sharing; And in the prior art, the cluster group membership passes through dedicated link and PoC swap data separately respectively, and no matter whether the cluster group membership talks, and all takies certain channel resource.The solution of the present invention has compared with prior art reduced the bandwidth demand of network side, and has improved the utilization ratio of channel.
In addition, in the solution of the present invention, on the basis of CDMA2000 system, increase ptt server to realize group service, further by layer 3 (L3, Layer 3) agreement carrier signaling, by MAC agreement voice-bearer encoding stream; And in the prior art, by the Session Initiation Protocol carrier signaling, by Real-time Transport Protocol voice-bearer encoding stream.Because L3 agreement and MAC agreement are with respect to Session Initiation Protocol and Real-time Transport Protocol, length through the message after the protocol processes has remarkable minimizing, so the solution of the present invention can significantly be saved, and the signaling of eating dishes without rice or wine is transmitted and the expense of speech coding flow transmission, thereby further improve the utilance of channel, improved the time delay of calling out access and voice transfer.
Description of drawings
Fig. 1 is based on the system schematic based on the realization group service of IMS of 3GPP definition;
Fig. 2 is the schematic diagram of the signaling surface protocol stack of system shown in Figure 1;
Fig. 3 is the schematic diagram of the service surface protocol stack of system shown in Figure 1;
Fig. 4 is the system schematic based on the realization group service of CDMA2000 of the preferred embodiment of the present invention;
Fig. 5 is the schematic diagram of the signaling surface protocol stack of system shown in Figure 4;
Fig. 6 is the schematic diagram of the service surface protocol stack of system shown in Figure 4;
Fig. 7 is the flow chart of group calling caller according to the preferred embodiment of the invention;
Fig. 8 is the called flow chart of group calling according to the preferred embodiment of the invention;
Fig. 9 is the flow chart seized of speaking right according to the preferred embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described below in conjunction with the drawings and specific embodiments.
The system of realization group service of the present invention is based on the system of CDMA2000.Because CDMA2000 is the 3G (Third Generation) Moblie technical standard, have spectrum utilization efficiency efficiently, it supports the powerful of data service.The present invention utilizes the data service function of CDMA2000, and by the network entity of existing CDMA2000 is suitably revised, formation can provide the system of common speech, data service and group service simultaneously.
As shown in Figure 4, in a preferred embodiment, system of the present invention comprises travelling carriage (MS, MobileStation), base station sub-system (BSS, Base Station Subsystem), mobile switching centre (MSCMobile Switching Center), Packet Control Function equipment (PCF, Packet Control Function and ptt server, wherein, connect by eating dishes without rice or wine between MS and the BSS, pass through the standard A interface between BSS and the PCF, be that the A8/A9 interface connects, A9 is a signaling interface, and A8 is a business interface; Connect by PTT service-specific interface between PCF and the ptt server, preferably, this group service special purpose interface is Group Map Protocol (GMP, a Group Mapping Protocol) interface; Connect by the A1/A2 interface between BSS and the MSC, A1 is a signaling interface, and A2 is a business interface.
BSS comprises interconnected base transceiver station (BTS, Base Transceiver System) and base station controller (BSC, Base Station Controller).
Ptt server is finished the calling of group service and is controlled, sends functions such as channel assignment request, management and group and user management.
Original entity is upgraded in the CDMA2000 system, wherein:
PCF is the PCF function of compatible original CDMA2000 not only, also has functions such as trunking signal forwarding and trunked call processing;
MSC is the MSC function of compatible original CDMA2000 not only, also has the function of mobile management under the cluster state and supplementary service management; If MSC does not upgrade, the user can not carry out normal voice calls again when carrying out the cluster audio call so;
BSC is the BSC function of compatible original CDMA2000 not only, also has functions such as trunking signal forwarding, trunked call processing and shared channel distribution;
BTS is the BTS function of compatible original CDMA2000 not only, also has functions such as common signal channel processing, Traffic Channel processing;
MS is the MS function of compatible original CDMA2000 not only, also has the PTT function.
Fig. 5 is the signaling surface protocol stack of the system of the preferred embodiment of the present invention.Signaling surface protocol stack transmission PTT signaling, the PTT signaling comprises group calling demand signalling, group calling response signaling etc.In Fig. 5, the agreement after A9+ represents the A9 signaling expanded; The Act agreement is the CDMA trunking signal agreement between PCF and the ptt server.
In conjunction with Fig. 5 the signaling transmission is described, MS is packaged into short data burst (SDB at L3 with the group calling demand signalling, Short Data Burst) message, then SDB message is controlled (LAC through link-access successively, Link Access Control), medium access control protocol (MAC, Medium AccessControl) processing of agreement, (PHY, Physical layer) is sent to BSS by physical layer; BSS carries out the processing of MAC, LAC agreement to what receive by the PHY layer successively from the message of MS, at the L3 layer group calling demand signalling in the SDB message is parsed, then the group calling demand signalling is passed through successively A9+, transmission control protocol (TCP, Transmission Control Protocol), IP, asynchronous transfer mode (ATM, Asynchronous Transfer Mode) adaptation layer 5 (AAL5, ATMAdaptation Layer), the processing of ATM agreement, be sent to PCF by the PHY layer; PCF carries out the processing of ATM, AAL5, IP, TCP, A9+ agreement to what receive by the PHY layer successively from the message of BSS, parse the group calling demand signalling, then the group calling demand signalling is passed through successively the processing of Act, TCP, IP, link layer (LINK) agreement, be sent to ptt server by the PHY layer; Ptt server carries out the processing of LINK, IP, TCP, Act agreement to what receive by PHY successively from the message of PCF, parses the group calling demand signalling.
The group calling response signaling of ptt server is forwarded to MS by opposite approach.Referring to Fig. 5, the group calling response signaling of ptt server passes through the processing of Act, TCP, IP, LINK agreement successively, is sent to PCF by the PHY layer; PCF will pass through the processing of LINK, IP, TCP, Act agreement successively by the message from ptt server that the PHY layer receives, parse the group calling response signaling, then the group calling response signaling is carried out successively the processing of A9+, TCP, IP, AAL5, ATM agreement, be sent to BSS by the PHY layer; BSS will carry out the processing of ATM, AAL5, IP, TCP, A9+ agreement from the message of PCF successively by what PHY received, parse the group calling response signaling, then the group calling response signaling is passed through successively the processing of L3, LAC, MAC agreement, be sent to MS by the PHY layer; MS passes through the processing of MAC, LAC, L3 agreement successively to the group calling response signaling from BSS that receives by the PHY layer, parses the group calling response signaling.
This shows, because the agreement at the transmitting signaling of eating dishes without rice or wine is the L3 agreement, the expense of L3 agreement is more much smaller than the expense of the agreements such as SIP of prior art, therefore utilizes system of the present invention can effectively reduce the burden of space interface signaling transmission, thereby improves the access delay of calling out.
Fig. 6 is the service surface protocol stack of the system of the preferred embodiment of the present invention.What the service surface protocol stack transmitted is the PTT business datum, and the PTT business datum comprises vocoded data.In Fig. 6, Voice represents the voice coder code stream, the group calling under GMP has identified.
In conjunction with Fig. 6 the transmission of PTT business datum is described, MS is a voice packet and in the encapsulation of MAC layer with the speech coding stream encryption, is sent to BSS by the PHY layer; BSS will carry out the processing of MAC agreement by the voice packet that the PHY layer receives, parse this voice coder code stream, then at generic route encapsulation (GRE, General Route Encapsulation) layer is encapsulated in the voice coder code stream in the GRE bag, and pass through the processing of IP, AAL5, ATM agreement successively, be sent to PCF by the PHY layer; PCF carries out the processing of ATM, AAL5, IP, GRE agreement successively to the voice packet that receives by the PHY layer, parse the voice coder code stream, and the voice coder code stream is packaged into GMP bag at the GMP layer, then it is carried out sending to ptt server by the PHY layer after the processing of UDP, IP, LINK agreement successively; Ptt server parses the voice coder code stream after the voice packet from PCF that receives by the PHY layer is carried out the processing of LINK, IP, UDP, GMP agreement successively.
Ptt server carries out the voice coder code stream being sent to the PCF that each cluster group membership distributes by the PHY layer after the processing of GMP, UDP, IP, LINK agreement successively; PCF carries out the processing of LINK, IP, UDP, GMP agreement to what receive by the PHY layer successively from the voice packet of ptt server, parse the voice coder code stream, then the voice coder code stream is carried out being sent to the BSS that each cluster group membership distributes by the PHY layer after the processing of GRE, IP, AAL5, ATM agreement successively; BSS will carry out the processing of ATM, AAL5, IP, GRE agreement from the voice packet of PCF successively by what the PHY layer received, parse the voice coder code stream, speech coding stream be carried out being sent to by the PHY layer after the processing of MAC agreement then each cluster group membership's MS; After MS will carry out the processing of MAC agreement by the voice packet from BSS that the PHY layer receives, deliver to the loud speaker playback after parsing the voice coder code stream.
This shows, because the agreement of transmitting audio data is the MAC agreement on eating dishes without rice or wine, the expense of MAC agreement is more much smaller than the expense of the agreements such as RTP that prior art adopts, therefore utilize system of the present invention to realize that group service can effectively reduce the burden of air interface voice transfer of data, thereby improve the time delay of voice transfer.
After ptt server receives that request is set up in group calling that MS sends, be that cluster is set up the PTT Traffic Channel between upright BSS and the ptt server, i.e. PTT Traffic Channel between Traffic Channel between BSS and the PCF and PCF and the ptt server.After Traffic Channel is set up, the speech data of all cluster group memberships' MS is all uploaded speech data by the Traffic Channel between the Traffic Channel between BSS and the PCF and PCF and the ptt server to ptt server, ptt server issues the speech data that cluster group membership's MS uploads by the Traffic Channel between the Traffic Channel between ptt server and the PCF and PCF and the BSS, BSS is by eating dishes without rice or wine respectively to cluster group membership's MS distribution speech data then.This shows, MS is with the mutual PTT business datum of described ptt server the time, PTT Traffic Channel between shared BSS and the PCF and the PTT Traffic Channel between PCF and the ptt server, therefore above-mentioned Traffic Channel is the shared service channel, thereby saved channel resource, improved the utilance of channel.
And in the system of the present invention, PCF has the interface of communicating by letter with ptt server, can directly communicate by letter with ptt server, thereby need not to transmit data by packet data serving node (PDSN, Packet DataServing Node), has further improved time delay.
The present invention also provides the method that realizes group service, this method is based on system shown in Figure 4, the calling party initiates group calling by group calling, set up the cluster group, BSS and shared service channel between the PCF and the shared service channel between PCF and the ptt server under the group calling calling party set up in the ptt server indication; And set up BSS and shared service channel between the PCF and the shared service channel between PCF and the ptt server under the group calling callee; The cluster group membership initiates talk request when the shared service channel idle, ptt server is authorized the cluster group membership speaking right of request speech.
Fig. 7 is the flow process of group calling caller according to the preferred embodiment of the invention.Referring to Fig. 7, group calling calling procedure of the present invention comprises the steps:
Step 701: the group calling calling party initiates the PTT call setup request message by button, and this message is by access channel or strengthen the access channel carrying, under the group calling calling party BSS with this message transparent transmission to PCF, PCF with this message transparent transmission to ptt server.
After step 702:PTT server received the PTT call setup request message, transmitting channel was set up Indication message to PCF.
Step 703:PCF sends the A9 allocation request message to BSS, sets up corresponding the connection with request.
After step 704:BSS receives the A9 allocation request message, set up with MSC between A1 be connected so that under MSC user is in cluster calling state, can realize the various various supplementary services relevant with plain old telephone.
Air traffic channels between step 705:BSS foundation and the group calling calling party.
Whether step 706:BSS judges that it is connected with A8 between the PCF and sets up, if then forward step 708 to; Otherwise, forward step 707 to.
Need explanation, A8 is connected with and may sets up, and for example, has initiated to set up BSS by other group calling and has been connected with A8 between the PCF.
Step 707:BSS initiate to set up with PCF between A8 be connected, and PCF initiate to set up with ptt server between GMP be connected, this A8 connects to be connected with GMP and is the shared service channel, in case this shared service channel is set up, belong to all cluster group memberships of a BSS together by this shared service channel and ptt server swap data with the group calling calling party.
Step 708: the group calling calling party sends the PTT call setup and finishes message to ptt server, and the expression caller is set up successfully.
Step 709:PTT server sends speaking right (Floor) authorization messages to the group calling calling party, authorizes the group calling calling party authority of speech.
Through above step, the group calling calling party sets up group calling, and group calling calling party's shared service channel is successfully set up.
Fig. 8 is the called flow chart of group calling according to the preferred embodiment of the invention.Referring to Fig. 8, group calling called flow of the present invention comprises the steps:
Step 801:PTT server sends Act group information broadcast message to PCF, PCF sends A9 group information broadcast message to BSS after receiving this message, BSS receives after this message in paging channel or forward shared control channel transmission group information broadcast message to the cluster group membership, comprises group calling callee's information in this group information broadcast message.
Step 802: request message was set up in transmission PTT group calling after the group calling callee received the group information broadcast message, this message is by access channel or strengthen the access channel carrying, B S S is transparent to PCF with this message under the group calling callee, PCF with this message transparent transmission to ptt server.
Step 803:PTT server receives after the PTT group calling sets up request message, and transmitting channel is set up Indication message to PCF.
Step 804:PCF receives after channel sets up Indication message, sends the A9 allocation request message to BSS, and corresponding the connection set up in request.
After step 805:BSS receives the A9 allocation request message, set up with MSC between A1 be connected so that under MSC user is in cluster calling state, MSC can realize the various supplementary services relevant with plain old telephone.
Air traffic channels between step 806:BSS foundation and the group calling callee.
Whether step 807:BSS judges that BSS is connected with A8 between the PCF and sets up, if then forward step 809 to; Otherwise, forward step 808 to.
Need explanation, A8 is connected with and may sets up, and for example, the A8 that has been initiated to set up between BSS and the PCF by other cluster group membership of cluster group connects.
Step 808:BSS initiate to set up with PCF between A8 be connected, and PCF initiate to set up with ptt server between GMP be connected, this A8 connects to be connected with GMP and is the shared service channel, in case the shared service channel is set up, all belong to the cluster group membership of this BSS by this shared service channel and ptt server swap data.
Step 809: group calling callee ring, user key-press adds group calling.
Step 810: the group calling callee sends PTT group calling foundation and finishes message to ptt server.
Step 811: if having the people to talk in the current cluster group, then ptt server sends Floor and takies message to the cluster group membership; If unmanned speech in the current cluster group, then ptt server sends the Floor idle message to the cluster group membership.
Like this, ptt server is set up group calling callee's shared service channel.In Traffic Channel, from BSS to PCF, be the shared service channel to the Traffic Channel between the ptt server again, the cluster group membership has not only reduced the bandwidth demand of network side by this shared service channel and ptt server swap data, has also improved the utilance of channel.
Fig. 9 is the flow chart seized of speaking right (Floor) according to the preferred embodiment of the invention.Referring to Fig. 9, Floor of the present invention seizes flow process and comprises the steps:
Step 901: a certain cluster group membership is under the state of Floor free time, and BSS sends the Floor request message under it, under this cluster group membership BSS with this message transparent transmission to PCF, PCF with this message transparent transmission to ptt server.
After step 902:PTT server received the Floor request message, the group membership sent the Floor authorization messages to this cluster, and PCF is this message transparent transmission BSS under this cluster group membership, under this cluster group membership BSS with this message transparent transmission to this cluster group membership.
Step 903:PTT server sends Floor to other cluster group membership and takies message, other cluster group membership sends the Floor request message in the cluster group to stop, PCF is this message transparent transmission BSS under other clusters group membership, under other clusters group membership BSS respectively with this message transparent transmission to other corresponding cluster group membership.
Step 904: obtain the cluster group membership that Floor authorizes and send speech data to ptt server by the reverse traffic channel of having set up, ptt server is forwarded to other corresponding cluster group membership in the cluster group with the speech data that receives by the shared service channel.
In concrete implementation process, can carry out suitable improvement, to adapt to the concrete needs of concrete condition to system and a method according to the invention.Therefore be appreciated that according to the specific embodiment of the present invention just to play an exemplary role, not in order to restriction protection scope of the present invention.
Claims (15)
1, a kind of system that realizes group service is characterized in that, comprises an above user terminal, the base station sub-system BSS that supports group service with press-and-talk PTT function, Packet Control Function equipment PCF and the ptt server of supporting group service;
Described user terminal is connected by eating dishes without rice or wine with described BSS, described BSS is connected by the standard A interface with described PCF, described PCF is connected by the PTT special purpose interface with described ptt server, ptt server is after receiving the group calling foundation request that described user terminal is sent, set up the PTT Traffic Channel between BSS and the ptt server, a described above user terminal is shared this PTT Traffic Channel with the mutual PTT business datum of described ptt server the time;
Wherein, described user terminal is sent to BSS after the processing through L3 agreement, LAC agreement, MAC agreement and PHY agreement successively with the PTT signaling; The signaling that described BSS sends user terminal parses the PTT signaling after the processing through PHY agreement, MAC agreement, LAC agreement and L3 agreement successively;
Described BSS is sent to user terminal after the processing through L3 agreement, LAC agreement, MAC agreement and PHY agreement successively with the PTT signaling that PCF sends; Described user terminal parses the PTT signaling after the processing through PHY agreement, MAC agreement, LAC agreement and L3 agreement successively with the signaling that BSS sends;
Described user terminal is sent to BSS after the processing through MAC agreement, PHY agreement successively with the PTT business datum; The data that described BSS sends user terminal parse the PTT business datum after the processing through PHY agreement and MAC agreement successively;
Described BSS is sent to user terminal after the processing through MAC agreement, PHY agreement successively with the PTT business datum that PCF sends; Described user terminal parses the PTT business datum after the processing through PHY agreement and MAC agreement successively with the data that BSS sends.
2, system according to claim 1 is characterized in that, described BSS comprises interconnected base transceiver station BTS and base station controller BSC;
Described BTS is connected by eating dishes without rice or wine with user terminal;
Described BSC is connected by the standard A interface with PCF.
3, system according to claim 1 is characterized in that, described PTT special purpose interface comprises PTT signaling special purpose interface and PTT service-specific interface.
4, system according to claim 3 is characterized in that, described PTT signaling special purpose interface comprises CDMA trunking signal agreement Act protocol layer, tcp protocol layer, ip protocol layer, LINK protocol layer and PHY protocol layer;
Described PCF is sent to ptt server after the PTT signaling is passed through the processing of Act agreement, Transmission Control Protocol, IP agreement, LINK agreement and PHY agreement successively; Described ptt server parses the PTT signaling after the processing through PHY agreement, LINK agreement, IP agreement, Transmission Control Protocol and Act agreement successively to the signaling that PCF sends;
Described ptt server is sent to PCF after the PTT signaling is passed through the processing of Act agreement, Transmission Control Protocol, IP agreement, LINK agreement and PHY agreement successively; The signaling that described PCF sends ptt server parses the PTT signaling after the processing through PHY agreement, LINK agreement, IP agreement, Transmission Control Protocol and Act agreement successively.
5, system according to claim 3 is characterized in that, described PTT service-specific interface comprises GMP protocol layer, udp layer, ip protocol layer, LINK protocol layer and PHY protocol layer;
Described PCF is sent to ptt server after the PTT business datum is passed through the processing of GMP agreement, udp protocol, IP agreement, LINK agreement and PHY agreement successively; Described ptt server parses the PTT business datum after the processing through PHY agreement, LINK agreement, IP agreement, udp protocol and GMP agreement successively to the data that PCF sends;
Described ptt server is sent to PCF after the PTT business datum is passed through the processing of GMP agreement, udp protocol, IP agreement, LINK agreement and PHY agreement successively; The data that described PCF sends ptt server parse the PTT business datum after the processing through PHY agreement, LINK agreement, IP agreement, udp protocol and GMP agreement successively.
6, system according to claim 1 is characterized in that, the PTT signaling that described BSS sends user terminal is sent to PCF after the processing through A9 agreement, Transmission Control Protocol, IP agreement, AAL5 agreement, ATM agreement and the PHY agreement of expansion successively; The signaling that described PCF sends BSS parses the PTT signaling after the processing through the A9 agreement of PHY agreement, ATM agreement, AAL5 agreement, IP agreement, Transmission Control Protocol and expansion successively;
The PTT signaling that described PCF sends ptt server is sent to BSS after the processing through A9 agreement, Transmission Control Protocol, IP agreement, AAL5 agreement, ATM agreement and the PHY agreement of expansion successively; The signaling that described BSS sends PCF parses the PTT signaling after the processing through the A9 agreement of PHY agreement, ATM agreement, AAL5 agreement, IP agreement, Transmission Control Protocol and expansion successively;
The PTT business datum that described BSS sends user terminal is sent to PCF after the processing through GRE agreement, IP agreement, AAL5 agreement, ATM agreement and PHY agreement successively; Described PCF parses the PTT business datum after the processing through PHY agreement, ATM agreement, AAL5 agreement, IP agreement and GRE agreement successively with the data that BSS sends;
The PTT business datum that described PCF sends ptt server is sent to BSS after the processing through GRE agreement, IP agreement, AAL5 agreement, ATM agreement and PHY agreement successively; Described BSS parses the PTT business datum after the processing through PHY agreement, ATM agreement, AAL5 agreement, IP agreement and GRE agreement successively with the data that PCF sends.
7, a kind of the system as claimed in claim 1 realizes the method for group service, it is characterized in that, comprising:
After a, ptt server received group calling calling party's PTT group calling foundation request, group calling calling party and the pairing shared service channel of group calling callee were set up in indication, and group calling calling party and callee become the cluster group membership;
B, cluster group membership initiate the speaking right request when speaking right is idle, ptt server sends the cluster group membership of speaking right authorization messages to this request speaking right, sends speaking right simultaneously and takies message to other all the cluster group memberships except that the cluster group membership who authorizes speaking right;
C, the cluster group membership who authorizes speaking right send speech data to ptt server by the shared service channel, and ptt server is forwarded to all cluster group memberships except that the cluster group membership who authorizes speaking right by the shared service channel with this speech data.
8, method according to claim 7 is characterized in that, the group calling calling party is set up in described ptt server indication and the pairing shared service channel of callee comprises:
A1, ptt server set up under the group calling calling party shared service channel between the BSS and PCF and the shared service channel between PCF and the ptt server by the forward control channel indication;
A2, ptt server set up under the group calling callee shared service channel between the BSS and PCF and the shared service channel between PCF and the ptt server by the forward control channel indication.
9, method according to claim 8 is characterized in that, step a1 comprises:
BSS sets up the shared service channel under the ptt server indication group calling calling party, and BSS judges whether the shared service channel between itself and the PCF is set up under the group calling calling party, if then directly forward step a2 to; Otherwise, set up under the group calling calling party shared service channel between the BSS and PCF and the shared service channel between PCF and the ptt server.
10, method according to claim 8 is characterized in that, between step a1 and a2, further comprises:
The group calling calling party sends PTT group calling foundation and finishes message to ptt server;
Ptt server sends the speaking right authorization messages to the group calling calling party.
11, method according to claim 8 is characterized in that, further comprises between step a1 and a2:
Ptt server comprises group calling callee's information to cluster group membership transmission group information broadcast message in this message;
After the group calling callee receives this group information broadcast message, send PTT group calling foundation and ask to ptt server.
12, method according to claim 8 is characterized in that, step a2 comprises:
BSS sets up the shared service channel under the ptt server indication group calling callee, and BSS judges whether the shared service channel between itself and the PCF is set up under the group calling callee, if then directly forward step b to; Otherwise, set up under the group calling callee shared service channel between the BSS and PCF and the shared service channel between PCF and the PTT.
13, method according to claim 8 is characterized in that, after step a2, further comprises: the group calling callee adds group calling, and transmission PTT group calling foundation is finished message to ptt server.
14, method according to claim 7 is characterized in that, step b comprises:
One cluster group membership initiates the speaking right request by BSS under it to ptt server when speaking right is idle;
Ptt server sends the speaking right authorization messages by BSS under this cluster group membership to this cluster group membership, and BSS sends speaking right respectively and takies message under other clusters group membership simultaneously;
BSS takies speaking right message respectively and is sent to other corresponding cluster group memberships under other clusters group membership.
15, method according to claim 7 is characterized in that, step c comprises:
The cluster group membership who authorizes speaking right sends speech data by shared service channel between BSS under it and the PCF and the shared service channel between PCF and the ptt server to ptt server;
Ptt server with the speech data that receives by the shared service channel distribution between the BSS under the shared service channel between itself and the PCF and PCF and other clusters group membership to BSS under other clusters group membership;
BSS is sent to speech data other corresponding cluster group memberships respectively under other clusters group membership.
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