CN1893691A - Cluster communication system - Google Patents
Cluster communication system Download PDFInfo
- Publication number
- CN1893691A CN1893691A CN 200510080640 CN200510080640A CN1893691A CN 1893691 A CN1893691 A CN 1893691A CN 200510080640 CN200510080640 CN 200510080640 CN 200510080640 A CN200510080640 A CN 200510080640A CN 1893691 A CN1893691 A CN 1893691A
- Authority
- CN
- China
- Prior art keywords
- terminal
- transponder
- communication system
- information
- calling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The cluster communication system includes terminals and repeaters. The said terminal is cellular type terminal. The repeater sends down going synchronizing sequence and common control information. Based on the said down going synchronizing sequence, terminal synchronizes to repeater. Detecting up going syn code (the detection can be periodic), repeater determines whether there is terminal to carry out up going synchronization to prepare sending service data. Obtaining service data of calling terminal, and address information of receiving terminal including in the service data, repeater forwards the service data based on the address information. The disclosed cluster communication system for communication between terminals is simple, effective and independent on current public mobile communication network.
Description
Technical field
The present invention relates to a kind of trunked communication system, especially a kind of trunked communication system based on TD-SCDMA technology.
Background technology
So-called trunking communication is an a kind of multi-user shared group communication channel and not interactive technology.Along with the development of mobile communication, the application of public mobile communication network has appearred trunking communicating technology is dissolved into.
Fig. 1 is a schematic diagram of realizing the mobile network terminal trunking communication in the public mobile communication net.With reference to Fig. 1, public mobile radio communication provides the General Principle of trunking communication to be: each channel in radio network controller centralized control and the management system; On down direction, the broadcast channel of system can be answered by all users simultaneously, on up direction, user's mobile network terminal sends the request of access channel to system, radio network controller is distributed to the user who makes a call to idle channel with dynamical fashion, again this channel is regained to the user who waits for after conversation is finished and is used.
Because public mobile communications network has wide coverage, thereby after Clustering is incorporated into public mobile communication network, can make the holder of mobile network terminal any time in network coverage realize trunking communication, especially in network based on CDMA (Code Division Multiple Access), trunked communication system can also provide high-speed data service (as video transmission, file transfer etc.) except short calling being provided, setting up the business such as list/multi-user's communication, dynamic reorganization, ambience listening, fail soft, Virtual Private Network.Yet the defective of prior art is: the holder of mobile network terminal can only realize trunking communication in network coverage, the network coverage less than or the network zone of breaking down in, the holder of mobile network terminal can't initiate trunked call.
Summary of the invention
The problem to be solved in the present invention provides a kind of trunked communication system, and this system can make the mobile network terminal holder realize trunking communication in the zone that does not have the network coverage.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions:
A kind of trunked communication system comprises terminal and transponder, and described terminal is the Cellular Networks terminal; Described transponder sends downlink synchronous sequence, and common control information, and terminal is synchronous according to described downlink synchronous sequence and transponder; Transponder detects uplink synchronous code (this detection can be periodically and detects), has judged whether that terminal carries out uplink synchronous to be ready for sending business datum; Transponder obtains the business datum of calling terminal, and obtains the address information of the receiving terminal that comprises in this business datum, according to described address information this business datum is transmitted.
In the said system, transponder specifically is the cycle to send downlink synchronous sequence with 5ms; Described synchronizing sequence is carried out and differs is the phase modulated of 90 degree, and with the message blocks corresponding to 1/4 common control information, a modulation period of synchronizing sequence is corresponding to a complete common control information.Described 5ms is a subframe, and 2 subframes constitute the frame of a 10ms, and the frame of 16 10ms constitutes 1 multi-frame.In the subframe of each 5ms, transponder sends common control information at the TS0 time slot; The terminal that makes a call sends business datum and signaling information to transponder at TS2, and obtains the control messages from terminal of transponder forwarding in TS6; Receiving terminal is at TS 1 transponder that transmits control message, and receives the business datum that transponder is transmitted at TS4 or TS5.
In the said system, described common control information comprises: frame number, terminal type sign, the control information of physical access channel, channel condition information.
In the said system, calling terminal transmitted carry out closed power control, and, receiving terminal is carried out open Loop Power control and the control of open loop uplink synchronous by the synchronous adjustment that the closed-loop uplink Synchronization Control realizes calling out master terminal.The trunking signal process of terminal room comprises call establishment, right of speech transfer process, right of speech preemption processes and calls out dispose procedure.
In the described system, before transponder sends downlink synchronous sequence, the available frequency that search sets in advance, if the free time then transponder send message at this frequency, show the existence of transponder.
Above technical scheme as can be seen, trunked communication system provided by the present invention makes mobile network terminal breaking away under the situation of network, keeps mutual communication; Simultaneously, the present invention has overcome the defective of directintermination transreceiver system, has further enlarged straight-through overlay area by using transponder.
Adopt the frame structure of existing TD-SCDMA system and structure of time slot, scrambler among the present invention, made the TD-SCDMA terminal under the situation that breaks away from network system, directly to carry out trunking communication.
Further, among the present invention, after current calling terminal finishes issuing service information, back one calling terminal is continued to use the scrambler and the frame number of last calling terminal, and making is not having under the situation of network system, and the channel management of trunked call is simpler, make things convenient for the frame synchronization of each terminal, call setup is more quick.
In sum, the invention provides simple and effectively, can break away from existing common mobile communication network and realize the trunked communication system of terminal room communication.
Description of drawings
Fig. 1 is a schematic diagram of realizing the mobile network terminal trunking communication among the mobile network;
Fig. 2 is the protocol architecture figure that realizes directintermination;
Fig. 3 is the frame structure of described Ud interface;
Fig. 4 is a system configuration schematic diagram of the present invention.
Embodiment
The present invention will realize not relying between the portable terminal function that has public mobile network now and keep communicating by letter, the i.e. direct mode operation of trunking communication between portable terminal.Be defined in the trunked call, the terminal that has speaking right is " calling terminal ", and all the other terminals are " receiving terminal "; According to the characteristics of trunking communication, in a calling, simultaneously a calling terminal can only be arranged.Below specifically introduce embodiments of the present invention.
Fig. 2 is the protocol architecture figure that realizes directintermination.The protocol architecture of the control plane of directintermination can be divided into three-decker, comprising: direct mode operation call control protocol layer (DMCC) provides foundation, maintenance, the channel resource release function of basic call business and the processing of short message; Direct mode operation media access control layer (DM-MAC) provides data link layer functions such as addressing, the encapsulation to the transmission of DMCC layer signaling and business datum and reception, protocol Data Unit (PDU), segmentation reorganization, wireless access; Physical layer, functions such as the synthetic and partition of responsible chnnel coding and scrambler, frame structure, power adjustment, modulation.
With reference to Fig. 3 as can be known, the frame structure that is adopted among the present invention is revised on the basis of existing TD-SCDMA, has defined multi-frame structure and time slot characteristic.Under direct mode operation, a multi-frame length is 160ms, the radio frames that to comprise 16 length be 10ms; Each radio frames can be further divided into two identical 5ms subframes again.Subframe structure and structure of time slot are consistent with regulation among the 3GPP, and each time slot adopts existing CDMA mode to carry out channel to cut apart, and the known content for those skilled in the art repeats no more.
1) with reference to Fig. 4, this figure is a system configuration schematic diagram of the present invention.As shown in the figure, in order to increase the coverage of express traffic, except that portable terminal, also comprise transponder in the direct communication system of the present invention; Communicate by the Ud interface between terminal and the transponder; The data that calling terminal sends are not received terminal and directly receive and decoding, but send the data to transponder, and transponder is deciphered and recompile the data of receiving, and then is forwarded to receiving terminal again.Among the present invention, all directinterminations all to transponder carry out chip, time slot, frame, multi-frame synchronously, all terminal room communications are transmitted by transponder and are finished, and calling terminal only and between the transponder transmits and receive data, and receiving terminal also only and between the transponder transmits and receive data.
On above-mentioned frame structure basis, calling terminal and receiving terminal take seven time slots jointly.Transponder sends common control information at TS0, and calling terminal and receiving terminal are all monitored this time slot, and information such as transponder state information, current channel condition are allowed; In addition, calling terminal receives the control messages of the receiving terminal that transponder transmits on TS6, and calling terminal sends business datum and signaling information to transponder at TS2, then can use TS3 simultaneously in data volume greatly the time; Receiving terminal is at the TS1 transponder that transmits control message, the business datum that the receipt of call terminal is transmitted through transponder on TS4 and TS5.
2) transponder sends downlink synchronous sequence, and common control information, and terminal is synchronous according to described downlink synchronous sequence and transponder.
Transponder is in case start, will search for the available frequency that sets in advance, if the described available frequency free time, then transponder will send message on this frequency, the existence of indication transponder, and then the terminal in all transponder coverages is carried out synchronous and obtain channel resource information according to described downlink synchronous sequence and transponder; If find that by detecting current described this frequency is occupied, then transponder will periodically detect the state of available frequency, wait for that the frequency resource after the free time, begins to send signal again, the existence of indication transponder.
Transponder sends common control information at TS0, notifies the existence of all terminal transponders, and the state of current channel is provided, and information such as current ongoing business are given the terminal that lags and enter.Common control information mainly comprises: frame number (0-15); Terminal type identification is indicated the current transponder transmission common control information that is; The transponder relevant information comprises forwarder identifier, transponder transmitting power, expectation received power etc.; Physical access channel (FPACH) control information, be the receiving terminal access procedure synchronously and the relevant information adjusted of power, and the frame number information of synchronous code that receives number and reception; Channel condition information comprises idle condition (Idle), keeps (Reserved) state and takies (Occupied) state; Channel related information, according to the channel status difference, information content difference, if when channel is in free time (Idle) state, then there is not described channel related information, if channel is for keeping (Reserved) state, then comprise the reservation channel type, the calling terminal identifier, receiving terminal identifier or receiving terminal group identifier, present type of service etc. if take (Occupied) state when channel is in, then comprise information such as calling terminal identifier, receiving terminal identifier or receiving terminal group identifier, present type of service, call priority.
Transponder sends downlink synchronous sequence SYNC DL, and synchronous base is provided.Receiving terminal described in the present invention and calling terminal keep synchronous process identical with existing TD-SCDMA net system terminal method for synchronous, are the known technology content of this area.
Above-mentioned every subframe duration 5ms, transponder send common control information at TS0 in the cycle, and send downlink synchronous sequence at descending pilot frequency time slot.Because sending to finish, each common control information needs 20ms, be that each common control information needs 4 subframes to send, receiving terminal finds the initial transmission subframe of each 20ms broadcast message for convenience, thereby, downlink synchronous sequence (SYNC_DL) all can carry out phase modulated in each subframe, add a fixing phase place when being each subframe transmission SYNC-DL, and indicate the pairing complete public control messages of these four subframes with phase modulation (135 °, 45 °, 225 °, the 315 °) angle of continuous 4 self-vibrations.Receiving terminal can obtain the synchronizing sub-frame of 5ms according to the SYNC-DL that calling terminal sends, according to the phase modulation of SYNC-DL obtain 20ms synchronously, further obtain the common control information of calling terminal.
For synchronous with transponder, calling terminal and receiving terminal must carry out one time the uplink synchronous process earlier when the information of transmission.Transponder sends in the FPACH of TS0 control information the synchronous adjustment information of the initial uplink of terminal.Pass through the synchronous of maintenance of closed loop Synchronization Control and transponder during calling terminal and the transponder continuous communiction, adjustment information can send in synchronous adjustment (SS) bit of TS6 synchronously.This process is identical with the mobile network for public system.
3) transponder detects uplink synchronous code, has judged whether that terminal carries out uplink synchronous to be ready for sending business datum;
Under idle condition, transponder will periodically attempt receiving uplink synchronous code, and whether detect has directintermination to initiate the uplink synchronous process, to obtain the ownership of channel.If terminal is in idle condition, terminal will be monitored the TS0 of transponder the cycle, obtain the state information of current channel, and in needs, the TS4 that terminal will arrive transponder collects further business information.
4) transponder obtains the business datum of calling terminal, and obtain the address information of the receiving terminal that comprises in this business datum, according to described address information this business datum is transmitted, promptly transponder is not resolved the message of DMCC layer, only bottom data is transmitted.The change and the renewal of transponder maintenance channel resource status; Transponder does not manage business datum, but finish forwarding of data between calling terminal and the receiving terminal, simultaneously the DM-MAC layer of the calling terminal data obtained is resolved, and revise state and the channel related information that TS0 goes up the channel that sends according to message content.Below specify.
If terminal has the demand that sends business datum, to judge whether current Traffic Channel is idle by the information that receives TS0, if the channel status free time, terminal will trigger the uplink synchronous process earlier, and from TS0, extract FPACH information and carry out power and regularly adjustment, setting this terminal then is calling terminal, begins service link between foundation and the receiving terminal.
On calling terminal, send out in the message, destination address is designated as transponder address, and in the message of DM-MAC layer the indication receiving terminal the address, after transponder receives a upward message of master terminal, decipher, and resolve DM-MAC layer message, source address is set to this transponder address, destination address is set to the address of receiving terminal, and is transmitted to receiving terminal; Receiving terminal sends to the information of calling terminal and also carries out identical processing.
Transponder is after receiving the signaling message that master terminal sends, will be according to the common control information on the content modification TS0 of signaling message, indication current business channel is Occupied or Reserved, and with information such as calling terminal identifier, received terminal identification, type of service notice other-end, the terminal understanding current business information that this part information spinner will lag for convenience and enter, and whether this terminal judges should add in the current calling.
Implementation of the present invention above has been described, in trunking communication, the signaling procedure of terminal room comprises: processes such as release are seized, called out to call setup, right of speech transfer, right of speech.If current receiving terminal need send data to current calling terminal, for example seize, processes such as right of speech switching then need current receiving terminal to carry out the uplink synchronous process earlier equally, and send a message to transponder at corresponding time slot, be forwarded to master terminal after treatment by transponder.
Hereinafter above-mentioned each signaling procedure is introduced.
The process of call setup is: the terminal that makes a call judges by the information that receives TS0 whether current Traffic Channel is idle, if the channel status free time, then this terminal will trigger the uplink synchronous process earlier, and from TS0, extract FPACH information and carry out power and regularly adjustment, setting this terminal then is calling terminal, begins service link between foundation and the receiving terminal; Because the terminal in the transponder coverage is all synchronous with transponder, thereby calling terminal sends call set up signaling by transponder, and the interior terminal of transponder coverage is being obtained and after the signaling, judges whether it is call request to oneself.Described call establishment further comprises: do not have the call establishment of affirmation and the affirmation call establishment is arranged.
The call establishment that described nothing is confirmed can be used for the calling procedure of individual calling or group calling, and so-called individual calling is meant the calling between unique user and the unique user, calls out to be present between two users; Group calling is meant one group of user of a customer call, is the communication between a plurality of users.Not having the call establishment of confirming is call establishment the most basic under the direct mode operation, and calling terminal is set up and called out, do not wait for replying of receiving terminal, but after sending repeatedly setup requests, directly begin to send business datum,
Described have the call establishment of affirmation only to be applicable to the individual calling process.The call establishment that affirmation is arranged is after calling terminal makes a call the request of setting up, and will wait for that replying of receiving terminal begins to send afterwards business datum.
Confirm and have in the process of confirming call setup that each terminal is all judged current Traffic Channel free time whether by the information of TS0 before having data to send, can avoid conflict to a certain extent like this in above-mentioned nothing; On the other hand, if two terminals all detect the idle concurrent data of sending of resource simultaneously, then can lead to a conflict, in this case, transponder can't correct decoding, and then causes this procedure failure.Then terminal can make a call again.As indicated above, transponder only is responsible for forwarding of data, and processing signaling not, but transponder will be revised common condition information on the TS0 according to message content.
The process of right of speech transfer is: after the business datum transmission of calling terminal finishes, the channel resource of calling terminal release busy at once, but timer Treserved is set, and the data of send calling out termination message (DM_TX_CEASED) notice receiving terminal and this calling terminal of transponder have sent and have finished, transponder will be revised TS0 and go up the common control information that sends, indicating channel enters the reserved state, and forward the message to receiving terminal, if the terminal in the receiving terminal group has the demand that sends data, will initiate right of speech and transfer the possession of flow process, and transmitting channel takies request (DM_TX_REQUEST) message, being forwarded to current calling terminal request by transponder makes a call, current calling terminal will be judged, if find that this request is effective, transmitting channel is taken grant message (DM_TX_ACCEPT PDU) give described receiving terminal, and surrender the control of communication channel, receiving terminal will change SOT state of termination simultaneously, be set to calling terminal, obtain the control of link, begin to send data.
If at the Treserved of current calling terminal after the time, there is not receiving terminal that the demand that sends data is arranged, if calling terminal also no longer needs to send data, then calling terminal is with the channel of release busy, this time sign off, all terminals are return idle condition, and it is idle condition that transponder is provided with channel status.
The process that right of speech is seized is: when the business datum of calling terminal sends, receiving terminal in the group of current communication or the outer terminal of certain group need take this Traffic Channel, and then triggering preemption processes, interrupt ongoing communication after the permission of acquisition master terminal, begin new business datum process; The terminal that request is seized can newly be set up a group calling or individual calling, also can be the continuity of current calling, just seizes to send professional right.After seizing successfully, transponder is provided with the business information that sends on its Common Control Channel according to the change of business.
Dispose procedure is divided into normal dispose procedure and unusual dispose procedure, and main situation about being suitable for comprises: calling terminal sends data, enters the reserved state, after timer expiry, calling terminal sends DM-RELEASE message, and the notice application layer, returns idle condition; After the call request of terminal called refusal calling terminal, calling terminal sends DM-RELEASE message, the channel of release busy; Calling terminal allows seizing of other-end, and the notice receiving terminal discharges this calling; When calling terminal/receiving terminal bottom (media access control layer/physical layer) occurs when unusual, trigger unusual dispose procedure.
Above-mentioned is signaling procedure embodiment among the present invention, realizes trunking communication owing to present embodiment is intended to solve the TD-SCDMA terminal under no network environment, thereby uses the existing employed scrambler of TD-SCDMA network in the present embodiment; Simultaneously, among the present invention in the transponder coverage terminal all carry out synchronously with transponder, thereby the present invention has guaranteed the continuity of the frame number that uses between the calling of new initiation and last calling.
As indicated above, terminal is carried out access procedure earlier one time before sending message, carries out the synchronous of physical layer, is specially:
Uplink synchronous sequence (SYNC_UL) the power P d that terminal receives according to the transmitting power Pt and the expectation of transponder broadcasting, and the transmitting power Pr of the transponder that measures of terminal calculate the transmitting power Pu of uplink synchronous code; Pu=Pd+Pt-Pr;
Terminal sends uplink synchronous code with Pu power to transponder;
After transponder is received uplink synchronous code, the power and the timing of this yard are compared with the power and the timing of described expectation, and comparative result is fed back to terminal by FPACH;
Terminal (as 20ms) in the regular hour is waited for the FPACH information of transponder feedback;
Receive the FPACH of transponder feedback, terminal sends the data that need transmit according to the transmitting power and the Timing Advance of power information among the FPACH and timing information adjustment oneself at predetermined channel to transponder.
Among the present invention, Initial Trans and timing by open Loop Power control and open loop synchronous control mode control terminal, the open loop power control of native system adopts the mode the same with TD-SCDMA, the transmitting power of receiving terminal will be according to the calling terminal transmitting power, and the expectation received power of the last broadcasting of TS0 and receiving terminal are measured resulting path loss and obtained; And among the present invention, the mode by closed power control and closed loop Synchronization Control realizes power and the timing that calling terminal transmits.
More than a kind of trunked communication system provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1, a kind of trunked communication system is characterized in that:
1) described system comprises terminal and transponder, and described terminal is the Cellular Networks terminal;
2) described transponder sends downlink synchronous sequence, and common control information, and terminal is synchronous according to described downlink synchronous sequence and transponder;
3) transponder detects uplink synchronous code, has judged whether that terminal carries out uplink synchronous to be ready for sending business datum;
4) transponder obtains the business datum of calling terminal, and obtains the address information of the receiving terminal that comprises in this business datum, according to described address information this business datum is transmitted.
2, trunked communication system as claimed in claim 1 is characterized in that:
2) be specially in: transponder is the cycle to send downlink synchronous sequence with 5ms; Described synchronizing sequence is carried out and differs is the phase modulated of 90 degree, and with the message blocks corresponding to 1/4 common control information, a modulation period of synchronizing sequence is corresponding to a complete common control information.
3, trunked communication system as claimed in claim 2 is characterized in that:
Described 5ms is a subframe, and 2 subframes constitute the frame of a 10ms, and the frame of 16 10ms constitutes 1 multi-frame.
4, trunked communication system as claimed in claim 3 is characterized in that:
In the subframe of each 5ms, transponder sends common control information at the TS0 time slot; The terminal that makes a call sends business datum and signaling information to transponder at TS2, and obtains the control messages from terminal of transponder forwarding in TS6; Receiving terminal is at the TS1 transponder that transmits control message, and receives the business datum that transponder is transmitted at TS4 or TS5.
5, as claim 1 or 4 one of them described trunked communication system, it is characterized in that: described common control information comprises: frame number, terminal type sign, the control information of physical access channel, channel condition information.
6, trunked communication system as claimed in claim 1 is characterized in that:
3) transponder periodically detects uplink synchronous code in.
7, trunked communication system as claimed in claim 1 is characterized in that:
Calling terminal transmitted carry out closed power control, and, receiving terminal is carried out open Loop Power control and the control of open loop uplink synchronous by the synchronous adjustment that the closed-loop uplink Synchronization Control realizes calling out master terminal.
8, trunked communication system as claimed in claim 1 is characterized in that:
The trunking signal process of terminal room comprises call establishment, right of speech transfer process, right of speech preemption processes and calls out dispose procedure.
9, trunked communication system as claimed in claim 1 is characterized in that:
2) before sending downlink synchronous sequence in, the available frequency that the transponder search sets in advance, if the free time then transponder send message at this frequency, show the existence of transponder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100806409A CN100446593C (en) | 2005-07-04 | 2005-07-04 | Cluster communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100806409A CN100446593C (en) | 2005-07-04 | 2005-07-04 | Cluster communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1893691A true CN1893691A (en) | 2007-01-10 |
| CN100446593C CN100446593C (en) | 2008-12-24 |
Family
ID=37598104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100806409A Active CN100446593C (en) | 2005-07-04 | 2005-07-04 | Cluster communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100446593C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291838A (en) * | 2011-08-15 | 2011-12-21 | 海能达通信股份有限公司 | Methods and devices for sending and receiving high priority service in direct mode |
| CN102812693A (en) * | 2010-03-31 | 2012-12-05 | 斯凯普公司 | System of user devices |
| CN103945421A (en) * | 2013-01-18 | 2014-07-23 | 中国普天信息产业股份有限公司 | Method for identifying broadband trunking direct mode operation call |
| US9019336B2 (en) | 2011-12-30 | 2015-04-28 | Skype | Making calls using an additional terminal |
| WO2015061993A1 (en) * | 2013-10-30 | 2015-05-07 | 华为技术有限公司 | Communication method, network-side device and communication system |
| US9258511B2 (en) | 2010-03-31 | 2016-02-09 | Skype | Indicia of contact viewing activity |
| US9521360B2 (en) | 2010-12-31 | 2016-12-13 | Skype | Communication system and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2081008A1 (en) * | 1992-01-30 | 1993-07-31 | Michael D. Sasuta | Method for receiving a communication after initiating a ptt |
| GB2264210A (en) * | 1992-02-05 | 1993-08-18 | Marconi Gec Ltd | Private mobile radio system |
| US5459761A (en) * | 1992-06-29 | 1995-10-17 | Motorola, Inc. | Intelligent repeater for trunked communications |
| FI950745A (en) * | 1995-02-17 | 1996-08-18 | Nokia Telecommunications Oy | Picking up mobile stations from a direct channel |
| CN2456420Y (en) * | 2000-06-09 | 2001-10-24 | 涂世杰 | 350MHz group extension station |
| CN100403807C (en) * | 2002-07-10 | 2008-07-16 | 协同智迅通信技术（深圳）有限公司 | Communication method for increasing paging receiving unit in terminal and system thereof |
| GB2408894B (en) * | 2003-12-04 | 2006-04-12 | Motorola Inc | Communication units, wireless communication system and method of communication therein |
-
2005
- 2005-07-04 CN CNB2005100806409A patent/CN100446593C/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9258511B2 (en) | 2010-03-31 | 2016-02-09 | Skype | Indicia of contact viewing activity |
| CN102812693A (en) * | 2010-03-31 | 2012-12-05 | 斯凯普公司 | System of user devices |
| US8885601B2 (en) | 2010-03-31 | 2014-11-11 | Skype | Switching user devices in a packet-based network |
| CN102812693B (en) * | 2010-03-31 | 2016-07-06 | 斯凯普公司 | The system of user's device |
| US9521360B2 (en) | 2010-12-31 | 2016-12-13 | Skype | Communication system and method |
| CN102291838B (en) * | 2011-08-15 | 2013-12-25 | 海能达通信股份有限公司 | Methods and devices for sending and receiving high priority service in direct mode |
| CN102291838A (en) * | 2011-08-15 | 2011-12-21 | 海能达通信股份有限公司 | Methods and devices for sending and receiving high priority service in direct mode |
| US9019336B2 (en) | 2011-12-30 | 2015-04-28 | Skype | Making calls using an additional terminal |
| CN103945421A (en) * | 2013-01-18 | 2014-07-23 | 中国普天信息产业股份有限公司 | Method for identifying broadband trunking direct mode operation call |
| CN104995957A (en) * | 2013-10-30 | 2015-10-21 | 华为技术有限公司 | Communication method, network-side device and communication system |
| WO2015061993A1 (en) * | 2013-10-30 | 2015-05-07 | 华为技术有限公司 | Communication method, network-side device and communication system |
| US10045365B2 (en) | 2013-10-30 | 2018-08-07 | Huawei Technologies Co., Ltd. | Communication system and method using D2D for out-of-network communications |
| CN104995957B (en) * | 2013-10-30 | 2019-08-27 | 华为技术有限公司 | A kind of communication means, network side equipment and communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100446593C (en) | 2008-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2408169C2 (en) | Method for dedication of communication channel, system of radio communication and structure of communication channel on section of radio line | |
| CN1247002C (en) | Method for determining triggering time for synchronizing program of PDCP | |
| KR101996357B1 (en) | Method and appratus for operating multiple timing advance group in mobile communication system using carrier aggregation | |
| CN106535337B (en) | Method, system and device for transmitting data by adopting carrier aggregation mode | |
| EP1890498B1 (en) | A method for establishing a call rapidly in cdma cluster communication system | |
| EP2230801B1 (en) | Method for sending and receiving multimedia operation data, base station device and user device | |
| CN100446593C (en) | Cluster communication system | |
| US8599754B2 (en) | Method, device, and system for configuring multicast broadcast single frequency network resources | |
| CN101421997A (en) | Method and apparatus for discontinuously receiving packet in a mobile communication system | |
| KR20150109119A (en) | Method and appratus of performing cell selection and random access of machine-type communication user equipment in mobile communication system | |
| TW200917725A (en) | Method for communicating | |
| CN103220801B (en) | The method of wireless data transmission | |
| RU2195789C2 (en) | Process of data transmission with packet switching | |
| CN100446592C (en) | Cluster communication method for mobile network terminal | |
| CN102316518A (en) | Improved request-to-send (RTS)/clear-to-send (CTS) communication control method | |
| EP1166499B1 (en) | Method and system for enabling a remote communication station to engage multiple communication stations | |
| CN1901699A (en) | Method for realizing cluster service in TD-SCDMA system | |
| KR100913416B1 (en) | Information transmitting method in mobile communication system | |
| WO2016200163A1 (en) | Enhanced mbms-based signal transmission/reception method | |
| CN1481180A (en) | Method of releasing single temporary block stream in mobile radio system | |
| CN101810041B (en) | Method for scheduling resource, network element and user equipment | |
| CN1968050A (en) | Physical channel collocating method of time division synchronization code division multiple access system | |
| WO2006131047A1 (en) | A method and system for real-time locating the group calling/multicast mobile station | |
| EP2587865B1 (en) | Overhead reduction in a communications system | |
| CN1167412A (en) | Communication control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |