CN101257664A - Call controlling equipment and call controlling method - Google Patents
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- CN101257664A CN101257664A CNA2007100843765A CN200710084376A CN101257664A CN 101257664 A CN101257664 A CN 101257664A CN A2007100843765 A CNA2007100843765 A CN A2007100843765A CN 200710084376 A CN200710084376 A CN 200710084376A CN 101257664 A CN101257664 A CN 101257664A
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Abstract
The invention provides a device and method for controlling the call, which can reduce the wireless resource consumption in the network. The call controlling device, which is connected with a plurality of terminals, includes: a network interface for sending and recieving the message with the outside; a storage device for storing a control message management list which stores the call controlling message and the corresponding transmission mode representing the call controlling message, in which the transmission mode includes two communication types, namely single broadcast and multicast, the call controlling message is used for controlling the conversation between the plurality of terminals and the device for controlling the call; a control unit for determining the communication type for responding the call controlling message corresponding to the recieved requested call controlling message and sending terminals by searching the control message management list when the requested call controlling message sent from one of plurality of terminals is recieved by the network interface, and sending the responded call controlling message to the determined terminal by the network interface according to the communication type determined by the control unit.
Description
Technical field
This invention relates to call control device and the calling-control method thereof that carries out radio communication, particularly carries out the call control device and the calling-control method thereof of radio communication in push-to-talk over cellular systems.
Background technology
At OMA (Open Mobile Alliance: Open Mobile Alliance) in the tissue, stipulated to be used for the Push to talk over Cellular application of 3GPP and 3GPP2.Wherein, OMA is responsible for stipulating the technical specification with the irrelevant Push to talk over Cellular of access technology.3GPP is responsible for developing and the concrete relevant Push to talk over Cellular technical specification of wireless network with 3GPP2.
Push to talk over Cellular (PoC:Push-to-talk over Cellular) is one of important application of cellular communications networks, it provides a kind of communication mode that can allow user and one or more other user's instant messagings, thereby a kind of business of similar walkie-talkie is provided.
In Push to talk over Cellular was used, a plurality of Push to talk over Cellular clients were formed a group.Can only have simultaneously a wireless one-key client terminal to send audio data stream in a group, other wireless one-key client terminal receives audio data stream as the recipient.The audio data stream of wireless one-key client terminal sends by the Push to talk over Cellular server and controls by the distribution token, and the wireless one-key client terminal that only obtains token can send audio data stream.For the relevant information of exchange token between wireless one-key client terminal and Push to talk over Cellular server, need be between them message such as transmitting control message.When having the Push to talk over Cellular client to send audio data stream, the Push to talk over Cellular server receives audio data stream and transmits to each wireless one-key client terminal.
If adopt clean culture to send packets of audio data, then the Push to talk over Cellular server need each the wireless one-key client terminal in group sends the copy of a packets of audio data, can there be the problem that causes the wasting of resources in the network like this, when number of users in the group increases, also can there be the problem that increases the Push to talk over Cellular load of server simultaneously.
At these problems, U.S. Pat 6,141, the 347A communique discloses a kind of method that improves the efficient of Push to talk over Cellular server and Network Transmission, mainly adopts multicast to come the transmitting audio data bag, thereby saves the resource in the network.
But, common cellular communications networks (for example Push to talk over Cellular) can not be supported multicast, in order in cellular communications networks, to support multicast, 3GPP2 tissue has proposed BCMCS (Broadcast/Multicast Service multicast/broadcast business) and has come multicast service (3GPP2X.S0022-0 " Broadcast and Multicast Service in cdma2000Wireless IP network ") in the supporting cellular communication network, thereby sends same data to a plurality of users simultaneously.This technology uses the control channel of air interface to come simultaneously to a plurality of wireless terminal transmission data, by adopting this technology, can in cellular network, support multicast, like this when between base station and wireless terminal, having only descending muticast data transmission, just can discharge the unicast tunnel resource between wireless terminal and the base station, thereby reduce the resource consumption of unicast tunnel.This technology is applicable to the group service of supporting the Push to talk over Cellular type in the 3G system.In the 3GPP2 standard, adopt the BCMCS controller to finish the controlled function of multicast channel in cellular network.
On the other hand, U.S. Pat 6,141, the technology of 347A communique adopts distributed control mode, only transmit audio data stream between different terminals, this distributed control mode can not effectively be managed group, may produce conflict between the different terminals in group communication.Therefore having defined the Push to talk over Cellular server in the standard of OMA comes group is controlled, this just need also need to transmit control messages and finish group's controlled function except transmitting audio data stream between wireless one-key client terminal and Push to talk over Cellular server.In the standard of OMA, defined TBCP (Talk Burst Control Protocol, Talk Burst control protocol) as group's control messages.
In the Push to talk over Cellular standard of OMA, except audio frequency, also need be between client and server transmitting control message, i.e. TBCP (Talk Burst Control Protocol) message.But in the prior art, only considered to use the multicast transmission audio frequency, and do not considered to use the multicast transmission control messages.
So, if between wireless one-key client terminal and Push to talk over Cellular server, adopt mode of unicast to send control messages such as TBCP message, even the wireless one-key client terminal receives audio data stream by BCMCS, still need the wireless one-key client terminal to keep unicast tunnel and transmit control messages, the unicast tunnel resource of air interface will be occupied, has the problem of the waste that causes channel resource like this.
Summary of the invention
The object of the present invention is to provide a kind of call control device and calling-control method thereof that is connected with a plurality of terminals by network, can effectively reduce control messages repeating in network and transmit, to reduce resource consumption.
In order to reach above-mentioned purpose, the calling-control method of the call control device that is connected with a plurality of terminals by network of the present invention, it is characterized in that may further comprise the steps: receiving step, via the network interface of above-mentioned call control device, receive the some request call control messages of sending from above-mentioned a plurality of terminals; Determining step, by retrieve stored call control message in the storage device of above-mentioned call control device, that will be used for the session between above-mentioned a plurality of terminals and the above-mentioned call control device is controlled, with the transmission means of the above-mentioned call control message of expression be the clean culture or the communication type of the multicast control information stored admin table that is mapped, determine and the communication type of the received corresponding response call control message of above-mentioned request call control messages and the terminal that sends to; And forwarding step, according to above-mentioned communication type, send above-mentioned response call control message to above-mentioned definite terminal via above-mentioned network interface.
In addition, in the calling-control method of described call control device, in above-mentioned determining step, according to above-mentioned communication type, also storing the above-mentioned control messages admin table of the multicast address of the unicast address of each terminal of above-mentioned a plurality of terminals and each terminal place multicast group by retrieval, determining and the corresponding address of above-mentioned communication type; In above-mentioned forwarding step,, use the corresponding terminal of determined above-mentioned address in above-mentioned a plurality of terminals to send above-mentioned response call control message via above-mentioned network interface.
Of the present invention by network and the call control device that a plurality of terminals are connected, comprising: network interface is used for sending and receiving message; Storage device, be used to store the control messages admin table, this control messages admin table is the storage that is mapped of the clean culture or the communication type of multicast with the transmission means of call control message and the above-mentioned call control message of expression, wherein, above-mentioned call control message is used for the session between above-mentioned a plurality of terminals and the above-mentioned call control device is controlled; And control unit, when the some request call control messages of sending that receives via above-mentioned network interface from above-mentioned a plurality of terminals, determine and the communication type of the received corresponding response call control message of above-mentioned request call control messages and the terminal that sends to by retrieving above-mentioned control information admin table; Above-mentioned communication type according to being determined by above-mentioned control unit sends above-mentioned response call control message via above-mentioned network interface to above-mentioned definite terminal.
In addition, in described call control device, above-mentioned control messages admin table is also stored the unicast address of each terminal of above-mentioned a plurality of terminals and the multicast address of each terminal place multicast group; Above-mentioned control unit is determined and the corresponding address of above-mentioned communication type by retrieving above-mentioned control messages admin table according to determined above-mentioned communication type; Via above-mentioned network interface, use the corresponding terminal of determined above-mentioned address in above-mentioned a plurality of terminals to send above-mentioned response call control message.
The invention effect is as follows:
Call control device and the calling-control method thereof that is connected with a plurality of terminals by network of the present invention optionally uses multicast to come transmitting control message, specifically is exactly to decide according to the control messages type to adopt clean culture or multicast transmits this message.For the control messages of type one to one, the Push to talk over Cellular server adopts clean culture to send, and for a pair of eurypalynous control messages, the Push to talk over Cellular server adopts multicast to send.
So, for the client that receives only control messages, can discharge the Radio Resource that air interface is used for unicast tunnel, thereby reduce radio resource consumption.In addition, can effectively reduce call control message repeating in network and transmit, reducing resource consumption, thereby can improve the utilance of cellular network resource.
Description of drawings
Fig. 1 is the block diagram that Push to talk over Cellular (PoC) the system formation that the present invention relates to is shown.
Fig. 2 is the block diagram that Push to talk over Cellular server shown in Figure 1 is shown.
Fig. 3 is the figure that an example of signaling management table shown in Figure 2 is shown.
Fig. 4 is the flow chart that the signaling transmission controlled function of Push to talk over Cellular server shown in Figure 2 is shown.
Fig. 5 is the signaling process figure that push-to-talk over cellular systems shown in Figure 1 is shown.
Embodiment
Below, specify embodiments of the present invention with reference to accompanying drawing.
Fig. 1 is the block diagram that Push to talk over Cellular (PoC) the system formation that the present invention relates to is shown.As shown in Figure 1, Push to talk over Cellular (PoC) system comprises: cellular network 1; BCMCS controller 12 as the BCMCS service equipment; Push to talk over Cellular server 11 as call control device; And a plurality of wireless one- key client terminals 21,22,23 as terminal.Finish control by between wireless one- key client terminal 21,22,23 and Push to talk over Cellular server 11, transmitting message such as call control message to the group that constitutes by wireless one- key client terminal 21,22,23.
Wherein, a plurality of wireless one- key client terminals 21,22,23 are connected to cellular network 1 via a plurality of AT (AccessTerminal accesses terminal) 31,32,33 respectively.Push to talk over Cellular server 11 and BCMCS controller 12 are connected to cellular network 1 via the router (MR) 13 of supporting multicast respectively.
Fig. 2 is the block diagram of Push to talk over Cellular server 11 shown in Figure 1.As shown in Figure 2, Push to talk over Cellular server 11 comprise be used for to the outside send message such as for example responding call control message and receive network interface 210 from the message such as for example request call control messages of outside, central processing unit (CPU) 211, as storage device and store signaling management table (being the control messages admin table) hard disk 212, have the internal memory 213 of control unit 201 and the bus 214 that each part mentioned above is linked together.Wherein, control unit 201 comprises signaling transmission control module 202 and Token Control module 203.
And the message that " request call control messages ", " response call control message " etc. are used to control is also referred to as " signaling message ", abbreviates " signaling " as.And, should " request call control messages " and " response call control message " be referred to as " call control message ".
Fig. 3 is the figure of the detailed content of expression signaling management table 204 shown in Figure 2.As shown in Figure 3, signaling management table 204 comprises call control message admin table 301, multicast address management table 302 and unicast address admin table 303.
In control messages admin table 301, to be used for TBCP message (being call control message) that the session of setting up is controlled between a plurality of wireless one- key client terminals 21,22,23 and Push to talk over Cellular server 11, with the storage that is mapped of the type of communicating by letter of the transmission means of expression TBCP message between a plurality of wireless one- key client terminals 21,22,23 and Push to talk over Cellular server 11.
As shown in Figure 3, TBCP message comprises following call control message: the TBCP refuse information of Push to talk over Cellular server refusal Push to talk over Cellular client-requested token; The TBCP idle message of expression token free time; The occupied TBCP of expression token takies message; The wireless one-key client terminal that the Push to talk over Cellular server notification obtains token stops to send the TBCP cancellation message of audio stream; Notice wireless one-key client terminal sends the TBCP request queue status response message of TBCP request message position in request queue; The TBCP that notice Push to talk over Cellular client session finishes disconnects message; Notice wireless one-key client terminal adds the TBCP connection message of session etc.
The type of communication comprises " one to one " and " one-to-many " these two types.If TBCP message only sends to a wireless one-key client terminal, the type of this TBCP message is " one to one " so, and promptly transmission means is clean culture.If TBCP message sends to a plurality of wireless one-key client terminals, the type of this TBCP message is " one-to-many " so, and promptly transmission means is a multicast.
In multicast address management table 302, corresponding stored the group identification of the multicast group under each wireless one-key client terminal, and corresponding to the transport address (being multicast address) of group identification.When the Push to talk over Cellular server will be when a plurality of wireless one-key client terminal transmission types be the TBCP message of " one-to-many ", retrieval multicast address management table 302, obtain the multicast address as the transport address of the affiliated group of a plurality of wireless one-key client terminals, send the TBCP message of " one-to-many " type then by this multicast address to a plurality of wireless one-key client terminals.
In unicast address admin table 303, corresponding stored the group identification of the multicast group under each wireless one-key client terminal, Push to talk over Cellular client identification, and the transport address of clean culture.When the Push to talk over Cellular server will be the TBCP message of " one to one " to the some transmission types in a plurality of wireless one-key client terminals, retrieval unicast address admin table 302, obtain the unicast address as the transport address of respective wireless PTT client, send the TBCP message of " one to one " type then by this unicast address to respective wireless PTT client.
Returning Fig. 2 further specifies.Control unit 201 is used to control the transmission of the multiple call control message that the session of setting up is controlled between a plurality of wireless one- key client terminals 21,22,23 and Push to talk over Cellular server 11.
When Push to talk over Cellular server 11 receives some request call control messages of sending from a plurality of wireless one- key client terminals 21,22,23 via network interface 210, control unit 201 is determined communication type with the received corresponding response call control message of request call control messages by retrieval signaling management table 204, and determines to send to which wireless one-key client terminal according to the content that will respond call control message.
Token Control module 203 is according to the request call control messages from the Push to talk over Cellular server, come to determine to postback to respective wireless PTT service device with the corresponding response call control message of this request call control messages, and should respond call control message and be notified to signaling transmission control module 202.
Signaling transmission control module 202 retrieve stored call control information admin table in 204 301 in hard disk is determined the communication type of these response call control messages, retrieve multicast address management table 302 and unicast address admin table 303 according to the communication type that retrieves again and determine the corresponding transport address of communication type with this response call control message, promptly definitely should respond call control message and send to which wireless one-key client terminal.
Fig. 4 is the process chart of the signaling transmission control module 202 of the control unit 201 in the expression Push to talk over Cellular server 11.
Receive to send to the wireless one-key client terminal from Push to talk over Cellular server 11 response call control message (step 501) afterwards, signaling transmission control module 202 retrieval call control message admin tables 301 judge whether the type of the communication of this response call control message is multicast (step 502).
If the result who judges in step 502 is a "No", promptly, the type of this response call control message is " one to one ", then signaling transmission control module 202 is retrieved unicast address admin tables 303, acquisition sends the unicast address (step 504) of this response call control message to respective wireless PTT client, then, adopt unicast address to transmit this response call control message (step 505).
If the result who judges in step 502 is a "Yes", promptly, the type of this response call control message is " one-to-many ", then signaling transmission control module 202 is retrieved multicast address management tables 302, acquisition sends the multicast address (step 503) of this response call control message to all wireless one-key client terminals, then, adopt multicast address to transmit this response call control message (step 505).
Fig. 5 shows the signaling process of the push-to-talk over cellular systems that the present invention relates to.The wireless one-key client terminal obtains token or discharges token to control messages such as Push to talk over Cellular server transmission request call control messages via network.And the state of Push to talk over Cellular server controls token, and send the state that control messages such as response call control message is come the relevant token of push-notification-answer client to the wireless one-key client terminal.Wherein, the solid line of band arrow is represented the clean culture signaling message, and the multicast signaling message is represented in the double dot dash line of band arrow, the dotted line presentation medium stream of band arrow.
At first, between wireless one-key client terminal 21 and wireless one-key server 11, set up session by Session Initiation Protocol.After having set up session, wireless one-key client terminal 21 just can send the request call control messages and ask token.As shown in Figure 5, the 21 usefulness clean cultures of wireless one-key client terminal are to the TBCP request message (401) of Push to talk over Cellular server 11 transmissions as the request call control messages.Then, Push to talk over Cellular server 11 receives after this TBCP request message, checks whether token is taken (402) by other wireless one-key client terminal 22,23.If it is occupied that token does not have, then Push to talk over Cellular server 11 these TBCP request messages of response send the TBCP authorization messages (404) of call control message in response to wireless one-key client terminal 21.Simultaneously, Push to talk over Cellular server 11 sends in response to other all wireless one- key client terminals 22,23 that the TBCP of call control message takies message (405), and the notice token is occupied.
In addition, Push to talk over Cellular server 11 is before sending the response call control message, and control unit 201 is determined communication type (403) with the received corresponding response call control message of TBCP request message as the request call control messages by retrieval call control information admin table 301.For example, when definite TBCP authorization messages is " one to one " type, transmit these TBCP authorization messages to wireless one-key client terminal 21 by clean culture; When definite TBCP takies message and is " one-to-many " type, take message to wireless one- key client terminal 22,23 these TBCP of transmission by multicast.
Then, after wireless one-key client terminal 21 receives the TBCP authorization messages, beginning sends Media Streams such as audio stream to Push to talk over Cellular server 11, and wireless one- key client terminal 22,23 receives after TBCP takies message, begins to receive the Media Streams of being transmitted by Push to talk over Cellular server 11 such as audio stream (406) from wireless one-key client terminal 21.
On the other hand, when wireless one-key client terminal 21 finishes the transmission of Media Streams such as audio stream and discharges token, can be by clean culture to the TBCP release message (407) of Push to talk over Cellular server 11 transmissions as the request call control messages.After Push to talk over Cellular server 11 receives this TBCP release message, check token status (408), and the TBCP idle message of call control message is notified to whole wireless one- key client terminals 21,22,23 in response.Then, control unit 201 is determined the communication type (409) of this TBCP idle message by retrieval call control information admin table 301.For example, when definite this TBCP idle message was " one-to-many " type, Push to talk over Cellular server 11 transmitted these TBCP idle message (410) by multicast to wireless one- key client terminal 21,22,23.
So, for the client that receives only call control message, can discharge the Radio Resource that air interface is used for unicast tunnel, thereby reduce radio resource consumption.Moreover the Push to talk over Cellular server is the type of the communication of controlling call control messages as described above, can effectively reduce call control message repeating in network and transmit, and reducing resource consumption, thereby can improve the utilance of cellular network resource.
More than, understand the preferred implementation of call control device of the present invention and calling-control method thereof in detail, but the invention is not restricted to this that those skilled in the art can suitably change as the case may be according to its aim.
For example in the above-described embodiment, the wireless one-key client terminal is 3, and the Push to talk over Cellular server is 1, but obviously can the according to circumstances concrete number of setting them.And for example in the above-described embodiment, control unit is made of realizing its function signaling transmission control module and Token Control module, as long as but obviously can realize its function, both can constitute by a module, also can constitute with upper module by three.
In addition, for example in the above-described embodiment, be stored in as the signaling management table in the hard disk of storage device (being the control information admin table) and comprise these three tables of call control information admin table, unicast address admin table and multicast address management table, as long as but can also can merge into a form by retrieving this signaling management table obtains the call control message that transmits between wireless one-key client terminal and Push to talk over Cellular server transmission means or transport address, perhaps be divided into more multilist, and the project in the form also can be come concrete the setting as required.
In addition, for example in the above-described embodiment, in the control messages admin table, mainly store the response call control message that sends to the wireless one-key client terminal by the Push to talk over Cellular server, but also can store other control messages such as request call control messages that send to the Push to talk over Cellular server by the wireless one-key client terminal as required.
In addition, the present invention can be widely used in the industry, not only can be used for push-to-talk over cellular systems, also can be used for other group communication and use.For example in wireless video conference system, also can adopt this technology to improve the resource utilization of system.
Claims (8)
1. the calling-control method of a call control device that is connected with a plurality of terminals by network is characterized in that, may further comprise the steps:
Receiving step via the network interface of above-mentioned call control device, receives the some request call control messages of sending from above-mentioned a plurality of terminals;
Determining step, by retrieve stored call control message in the storage device of above-mentioned call control device, that will be used for the session between above-mentioned a plurality of terminals and the above-mentioned call control device is controlled, with the transmission means of the above-mentioned call control message of expression be the clean culture or the communication type of the multicast control information stored admin table that is mapped, determine and the communication type of the received corresponding response call control message of above-mentioned request call control messages and the terminal that sends to;
Forwarding step according to above-mentioned communication type, sends above-mentioned response call control message via above-mentioned network interface to above-mentioned definite terminal.
2. the calling-control method of call control device as claimed in claim 1, wherein,
In above-mentioned determining step, according to above-mentioned communication type, also storing the above-mentioned control messages admin table of the multicast address of the unicast address of each terminal of above-mentioned a plurality of terminals and each terminal place multicast group by retrieval, determining and the corresponding address of above-mentioned communication type;
In above-mentioned forwarding step,, use the corresponding terminal of determined above-mentioned address in above-mentioned a plurality of terminals to send above-mentioned response call control message via above-mentioned network interface.
3. the calling-control method of call control device as claimed in claim 2, wherein,
In above-mentioned forwarding step, when above-mentioned communication type is clean culture, store the unicast address admin table of unicast address of each terminal of above-mentioned a plurality of terminals and determine and the corresponding unicast address of above-mentioned communication type by retrieving included being used in the above-mentioned control messages admin table, when above-mentioned communication type is multicast, stores the multicast address admin table of the multicast address of each terminal place multicast group and determine and the corresponding multicast address of above-mentioned communication type by retrieving included being used in the above-mentioned control messages admin table.
4. one kind by network and the call control device that a plurality of terminals are connected, and comprising:
Network interface, be used for and the outside between send and receive message;
Storage device, be used to store the control messages admin table, this control messages admin table is the storage that is mapped of the clean culture or the communication type of multicast with the transmission means of call control message and the above-mentioned call control message of expression, wherein, above-mentioned call control message is used for the session between above-mentioned a plurality of terminals and the above-mentioned call control device is controlled; And
Control unit, when the some request call control messages of sending that receives via above-mentioned network interface from above-mentioned a plurality of terminals, determine and the communication type of the received corresponding response call control message of above-mentioned request call control messages and the terminal that sends to by retrieving above-mentioned control information admin table;
Above-mentioned communication type according to being determined by above-mentioned control unit sends above-mentioned response call control message via above-mentioned network interface to above-mentioned definite terminal.
5. call control device as claimed in claim 1, wherein,
Above-mentioned control messages admin table is also stored the unicast address of each terminal of above-mentioned a plurality of terminals and the multicast address of each terminal place multicast group;
Above-mentioned control unit is determined and the corresponding address of above-mentioned communication type by retrieving above-mentioned control messages admin table according to determined above-mentioned communication type;
Via above-mentioned network interface, use the corresponding terminal of determined above-mentioned address in above-mentioned a plurality of terminals to send above-mentioned response call control message.
6. call control device as claimed in claim 5, wherein,
Above-mentioned control messages admin table comprises the multicast address admin table that the communication type that is used for call control message and the above-mentioned call control message of expression is mapped stored calls control messages admin table, the unicast address admin table and being used to of unicast address that is used to store each terminal of above-mentioned a plurality of terminals is stored the multicast address of each terminal place multicast group;
When the communication type of being determined by above-mentioned control unit is clean culture, above-mentioned control unit is determined and the corresponding unicast address of above-mentioned communication type by retrieving above-mentioned unicast address admin table, when the communication type of being determined by above-mentioned control unit was multicast, above-mentioned control unit was determined and the corresponding multicast address of above-mentioned communication type by retrieving above-mentioned multicast address management table.
7. call control device as claimed in claim 6, wherein,
Described control unit comprises Token Control module and signaling transmission control module;
Above-mentioned Token Control module is determined and the corresponding response call control message of this request call control messages, and this call control message is notified to above-mentioned signaling transmission control module according to above-mentioned request call control messages;
Above-mentioned signaling transmission control module is retrieved the communication type that above-mentioned call control information admin table is determined above-mentioned response call control message, retrieves above-mentioned address administration table and determines the corresponding address of above-mentioned communication type.
8. as each described call control device of claim 4 to 7, wherein,
Above-mentioned call control device is the Push to talk over Cellular server.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100843765A CN101257664A (en) | 2007-02-28 | 2007-02-28 | Call controlling equipment and call controlling method |
| JP2008048417A JP2008219893A (en) | 2007-02-28 | 2008-02-28 | Ringing control device and a ringing control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100843765A CN101257664A (en) | 2007-02-28 | 2007-02-28 | Call controlling equipment and call controlling method |
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| CN101257664A true CN101257664A (en) | 2008-09-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610385B (en) * | 2009-07-16 | 2011-12-07 | 中兴通讯股份有限公司 | System for realizing wireless video conference and method |
| 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 |
| CN110121010A (en) * | 2019-05-13 | 2019-08-13 | 重庆天蓬网络有限公司 | One key outgoing call implementation method, terminal, medium and electronic equipment |
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| JP6136217B2 (en) | 2011-12-27 | 2017-05-31 | 株式会社リコー | Communication management system, communication system, program, and maintenance system |
| JP6136367B2 (en) | 2013-02-28 | 2017-05-31 | 株式会社リコー | Communication management system, communication system, and program |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7130282B2 (en) * | 2002-09-20 | 2006-10-31 | Qualcomm Inc | Communication device for providing multimedia in a group communication network |
| JP3970803B2 (en) * | 2003-05-20 | 2007-09-05 | 三菱電機株式会社 | Inter-node synchronization method, radio control server, and radio bearer server in a radio network system |
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2007
- 2007-02-28 CN CNA2007100843765A patent/CN101257664A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101610385B (en) * | 2009-07-16 | 2011-12-07 | 中兴通讯股份有限公司 | System for realizing wireless video conference and method |
| CN110121010A (en) * | 2019-05-13 | 2019-08-13 | 重庆天蓬网络有限公司 | One key outgoing call implementation method, terminal, medium and electronic equipment |
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| JP2008219893A (en) | 2008-09-18 |
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Application publication date: 20080903 |