WO2005120035A1 - Procede et systeme pour l'interconnexion d'un systeme de groupe numerique et d'un systeme telephonique publique - Google Patents

Procede et systeme pour l'interconnexion d'un systeme de groupe numerique et d'un systeme telephonique publique Download PDF

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Publication number
WO2005120035A1
WO2005120035A1 PCT/CN2005/000448 CN2005000448W WO2005120035A1 WO 2005120035 A1 WO2005120035 A1 WO 2005120035A1 CN 2005000448 W CN2005000448 W CN 2005000448W WO 2005120035 A1 WO2005120035 A1 WO 2005120035A1
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WIPO (PCT)
Prior art keywords
cluster
call
gateway
telephone terminal
terminal
Prior art date
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PCT/CN2005/000448
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English (en)
Chinese (zh)
Inventor
Zhaosen Geng
Qiang Wu
Tie Li
Original Assignee
Zte Corporation
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Publication of WO2005120035A1 publication Critical patent/WO2005120035A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • H04L65/4046—Arrangements for multi-party communication, e.g. for conferences with distributed floor control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a technology for interconnecting and interconnecting a digital trunking system and an ordinary telephone system. Background technique
  • trunking communication has increasingly become an indispensable service content.
  • Digital trunking communication systems are dedicated mobile communication systems where multiple users share a set of wireless channels and use these channels dynamically, with a shared frequency.
  • the biggest feature of trunked communication is that the voice communication adopts PTT (Push To Talk) button, which can be connected in a push-to-talk manner. The called party can answer without going off-hook, and the connection speed is fast, and it can support functions such as group calling. .
  • the terminals participating in the PTT trunk call are generally special trunk-specific terminals, such as telephone terminals (such as fixed phones, CDMA mobile phones, GSM mobile phones, PHS mobile phones, 3G mobile phones, etc.), SIP (Session Initiation Protocol, SIP for short) terminals.
  • Other devices (these terminals are collectively referred to as telephone terminals) can also be added to the PTT trunking call, which will greatly expand the trunking call range, thereby effectively solving the problems of insufficient wireless network coverage of the digital trunking system. '
  • existing trunking communication systems have provided interconnection between digital trunking systems and ordinary telephone systems (including ordinary telephone systems such as fixed telephone systems, CDMA network telephone systems, GSM network telephone systems, PHS telephone systems, and next-generation network telephone systems).
  • the interworking function that is, the telephone terminal can also participate in trunking calls, but these digital trunking systems and ordinary telephone systems have several shortcomings in the way of interconnection. For example, when digital trunking systems and ordinary telephone systems are interconnected, No. 7 information is usually used.
  • the technical problem to be solved by the present invention is to provide a method and system for realizing interconnection and interworking between a digital trunking system and an ordinary telephone system, which can overcome the narrow application range of the digital trunking system existing in the prior art, difficult technical implementation, and high system control complexity.
  • the disadvantages are that it can expand the application range of the digital trunking system, simplify the technical implementation difficulty and control complexity, and solve the problem of telephone terminals participating in trunking calls.
  • the present invention provides a method for implementing interconnection and interworking between a digital trunking system and an ordinary telephone system, which includes:
  • Steps for a telephone terminal to initiate a trunk call as a caller Softswitch uses the call as a normal voice call and forwards the request to the trunking gateway of the digital trunking system.
  • the trunking gateway implements the conversion between external standard signaling and internal trunking system signaling And conversion of media formats;
  • Steps for the telephone terminal to join the trunk call as the called party the dispatch server sends a request for paging the telephone terminal to the trunk gateway, and the trunk gateway invites the telephone terminal to join the call through the ordinary telephone system, and implements signaling between the two systems in the trunk gateway Format and media format conversion;
  • Steps for the terminal to apply for the speaking right The telephone terminal requests to forward to the dispatching server through the cluster gateway, and the dispatching server grants the speaking right to the telephone terminal according to the request status of all the terminals for the speaking right at that time;
  • Steps for the phone terminal to release the speaking right the request for releasing the speaking right is forwarded to the dispatch server through the cluster gateway;
  • Steps for a telephone terminal to exit a trunk call Steps for a telephone terminal to exit a trunk call.
  • the telephone terminal includes a fixed telephone, a CDMA mobile phone, a GSM mobile phone, a 3G mobile phone, a PHS mobile phone, or a SIP terminal.
  • Steps for the telephone terminal to actively exit the cluster call the softswitch forwards the exit request through the cluster gateway to the dispatch server, and then the dispatch server deletes the telephone terminal from the cluster call member; or
  • Steps for digital trunking system to force telephone terminal to exit trunking call When terminating the call with the telephone terminal, the cluster gateway notifies the softswitch to end the call in accordance with the normal telephone processing mode, and releases the network resources allocated to the telephone terminal.
  • the above method for interconnecting and interconnecting the digital trunking system and the ordinary telephone system, wherein the step of initiating a trunk call by the telephone terminal as a caller specifically includes the following steps:
  • Step 11 The telephone terminal dials the number of the trunk call and initiates the trunk call
  • Step 12 After the softswitch analyzes the origin of the call according to the group number of the call, it sends signaling to the cluster gateway of the digital trunking system to invite the call, and the invited object is the calling number.
  • Step 13 The trunking gateway sends to the dispatch server Forward the request to initiate a call;
  • Step 14 The dispatch server authenticates the cluster home register according to the calling number. If the authentication fails, step 19 is performed, otherwise the next step is performed;
  • Step 15 The dispatch server pages each cluster terminal according to the normal cluster call process, and after the paging is completed, notifies the cluster gateway to accept the call request initiated by the telephone terminal;
  • Step 16 The cluster gateway allocates media stream resources for the phone terminal to establish this call.
  • Step 17 The cluster gateway notifies the soft switch to accept the call request from the phone terminal;
  • Step 18 The next generation network allocates network resources and establishes a connection for the calling terminal.
  • Step 19 The dispatch server sends a call rejection setup message to the cluster gateway.
  • the cluster gateway sends a rejection message to the softswitch.
  • the softswitch sends the setup to the phone terminal. Call failed message.
  • step 15 specifically includes the following steps:
  • Step 151 In the case of authentication, the scheduling server pages all activated wireless terminals of the cluster according to the group member information returned by the cluster home register;
  • Step 152 If there is no transmission channel carrying the cluster signaling between the dispatch server and the cluster signaling gateway, establish a channel carrying the cluster signaling between them;
  • Step 153 if there is no transmission channel carrying the cluster media stream between the dispatch server and the cluster media gateway, establish a channel for transmitting the cluster voice between them;
  • Step 154 The scheduling server notifies the trunking signaling gateway that the call is established.
  • Step 21 a trunk terminal or a telephone terminal initiates a trunk call
  • Step 22 The digital trunking system calls all called terminals included in the call;
  • Step 23 If the dispatch server finds that the called party of the trunk call includes a telephone terminal, the dispatch server sends a call telephone terminal message to the trunk gateway;
  • Step 24 The cluster gateway analyzes the softswitch of its home location according to the number of the telephone terminal and sends a call invitation to the softswitch;
  • Step 25 the softswitch calls the telephone terminal
  • Step 26 The phone terminal goes off-hook
  • Step 27 The softswitch allocates network resources for the phone terminal, and sends an invitation invitation message to the cluster gateway.
  • Step 28 The cluster gateway notifies the dispatch server that the call to the telephone terminal is completed, and the telephone terminal is added to the cluster call.
  • the dispatching server in the step of applying for the speaking right of the terminal grants the speaking right to the telephone terminal with the highest priority according to the request of all the terminals for the speaking right at that time.
  • Step 31 Activate the speaking right button agreed by the system, and the telephone terminal applies for speaking right;
  • Step 32 The button information requesting speaking right is forwarded to the cluster gateway through the next-generation network media gateway;
  • Step 33 The cluster gateway sends a request for a speaking right to the telephone terminal to the dispatch server;
  • Step 35 The trunk gateway passes the next-generation network media gateway's transit and uses a voice prompt to tell the telephone terminal whether the application for speaking right is successful.
  • the foregoing method for implementing interconnection and interworking between a digital trunking system and an ordinary telephone system wherein the excellent
  • the priority principle means that the scheduling server grants the speaking right to the user with the highest priority for the user who currently applies for the speaking right.
  • the terminal that is currently speaking also needs to participate in the comparison of priorities. When the priorities are the same, the terminal that applies for the speaking right first has priority. Gain the right to speak.
  • Step 41 Press the system to release the speaking right button, and start the phone terminal to release the speaking right process;
  • Step 42 The button releasing the speaking right information is forwarded to the cluster gateway through the next-generation network media gateway;
  • Step 43 The cluster gateway sends a request for the telephone terminal to release the speaking right to the dispatch server; Step 44: the dispatch server retracts the speaking right.
  • the digital trunking system in addition to the telephone terminal can actively release the right to speak, can also actively release the right to speak on the telephone terminal; when the right to speak is granted to the telephone terminal, if the telephone When the terminal has not spoken for more than the prescribed time of the system, or the length of the current speaking time of the telephone terminal has exceeded the maximum speaking time stipulated by the digital trunking system, the dispatch server has the right to directly release the speaking right of the telephone terminal.
  • Step 51 When the telephone terminal wants to exit the call, hang up the phone directly;
  • Step 52 The softswitch sends a hang-up message to the cluster gateway after the phone terminal hangs up;
  • Step 53 The cluster gateway notifies the cluster dispatch server that the telephone terminal has exited the call
  • Step 54 The dispatch server will delete the telephone terminal from the calling member according to this instruction.
  • the foregoing method for interconnecting and interconnecting the digital trunking system and the ordinary telephone system, wherein the digital trunking system forcing the telephone terminal to exit the trunk call specifically includes the following steps:
  • Step 61 the dispatch server notifies the cluster gateway to let the designated phone terminal exit the cluster call;
  • step 62 the cluster gateway notifies the soft switch to release the designated phone terminal;
  • Step 63 The softswitch notifies the telephone terminal of the call end
  • Step 64 The soft switch releases the network resources previously allocated for the telephone terminal
  • Step 65 The softswitch answers the cluster gateway, and the phone terminal is released.
  • Step 66 The cluster gateway releases the network resources previously allocated for the phone terminal;
  • Step 67 The cluster gateway answers the dispatch server, and the telephone terminal has exited the cluster call.
  • the foregoing method for interconnecting the digital trunking system with the ordinary telephone system wherein when the trunking gateway is connected to the next-generation network, the H.323 protocol or the SIP protocol is used to implement signaling interaction, and the RTP / RTCP protocol is used to transmit the voice media stream; the trunking
  • the signaling gateway adopts Megaco protocol or MGCP protocol to control the cluster media gateway.
  • the dispatch server will add multiple users to the call. If a private call is initiated, the number dialed by the user is the cluster number of the called user, which corresponds to only one cluster user.
  • the present invention also provides a system for implementing interconnection and interworking between a digital trunking system and an ordinary telephone system, including a trunking terminal, a base station, a scheduling server, a trunking home register, a trunking signaling gateway, and a trunking media gateway It consists of a digital trunking system and a next-generation network system consisting of a softswitch module, a next-generation network media gateway, and a telephone terminal. Among them:
  • the telephone terminal acts as the calling party to initiate a cluster call.
  • the softswitch module forwards the call as a normal voice call to the trunking gateway of the digital trunking system.
  • the trunking gateway implements conversion between external standard signaling and internal trunking system signaling and the media format. Conversion
  • the telephone terminal joins the cluster call as the called party.
  • the dispatch server sends a request for paging the telephone terminal to the cluster gateway.
  • the cluster gateway invites the telephone terminal to join the call through the next-generation network system, and implements the signaling format between the two systems in the cluster gateway. And media format conversion;
  • the telephone terminal applies for the speaking right, and the telephone terminal requests to forward to the dispatching server through the cluster gateway, and the dispatching server grants the speaking right to the telephone terminal according to the request of all terminals for the speaking right at the time;
  • the server; and the telephone terminal exit the cluster call through the cluster gateway.
  • the above-mentioned system for interconnecting the digital trunking system with the ordinary telephone system wherein: the trunking terminal and the base station do not need to perform direct signaling and voice interaction with the ordinary telephone system, and do not need to care about whether ordinary telephone terminals participate in the call;
  • the dispatching server is responsible for maintaining the cluster call that the cluster terminal and the ordinary telephone terminal participate in, performing signaling interaction with the cluster signaling gateway to complete the cluster call control of the ordinary telephone, and performing media interaction with the cluster media gateway to complete the voice forwarding work related to the ordinary telephone;
  • the cluster home register is responsible for maintaining the terminal type and user information of the cluster terminal and the ordinary telephone terminal. And group information, the authentication and charging of trunk calls to trunk terminals and ordinary telephone terminals;
  • trunk signaling gateways are mainly responsible for signaling translation between trunk systems and ordinary telephone systems, and signaling interaction with the softswitch module is completed Connection control of trunk calls, controlling resources of trunk media gateways, maintaining and scheduling communication links between servers;
  • the cluster media gateway is mainly responsible for distributing voice media streams, maintaining and scheduling the voice link between servers, and responsible for format conversion of voice media streams between digital trunking systems and ordinary telephone systems, and playing prompts;
  • the soft switch module is responsible for maintaining the call of the ordinary telephone terminal, and performing signaling interaction with the cluster signaling gateway to complete the connection control of the cluster call and control the resources of the next-generation network media gateway;
  • the next-generation network media gateway is mainly responsible for accepting the control of the softswitch module and forwarding the voice media stream; the telephone terminal can participate in the cluster call as the terminal of the cluster call, that is, it can initiate the cluster call as the calling party, or it can passively participate in the cluster call as the called party .
  • the telephone terminal dials the number of the trunk call and initiates the trunk call
  • the softswitch module analyzes the origin of the call according to the group number of the call, it sends signaling to the trunking gateway of the digital trunking system to invite the call, and the invited object is the calling number;
  • the cluster gateway forwards the request to initiate a call to the dispatch server
  • the dispatching server authenticates the cluster home register according to the calling number. If the authentication fails, the dispatching server will send a call rejection message to the cluster gateway.
  • the cluster gateway sends a rejection message to the softswitch module.
  • the softswitch module sends a call to the phone terminal to establish the call. Failure message
  • the dispatch server pages each cluster terminal according to the normal cluster call process, and after the page is completed, it notifies the cluster gateway to accept the call request initiated by the telephone terminal;
  • the cluster gateway allocates media stream resources for the phone terminal to establish this call
  • the cluster gateway notifies the softswitch module to accept the call request from the telephone terminal;
  • the next generation network allocates network resources and establishes connections for telephone terminals that initiate calls.
  • the trunk terminal or telephone terminal initiates a trunk call
  • the digital trunking system calls all called terminals included in the call; If the dispatch server finds that the called party of the trunk call includes a telephone terminal, the dispatch server sends a call telephone terminal message to the trunk gateway;
  • the cluster gateway analyzes the soft switching module of the home terminal according to the number of the telephone terminal and sends a call invitation to the soft switching module;
  • the softswitch module calls the telephone terminal
  • the soft switch module allocates network resources for the telephone terminal and sends an acceptance invitation message to the cluster gateway.
  • the cluster gateway notifies the dispatch server that the call to the telephone terminal is completed, and the telephone terminal joins the cluster call.
  • the phone terminal activates the system to apply for the right to speak, and applies the right to speak;
  • the key information for applying for the speaking right is forwarded to the cluster gateway through the next-generation network media gateway; the cluster gateway sends a request for the speaking right to the telephone terminal to the dispatch server;
  • the scheduling server decides whether to grant the speaking right to the phone terminal according to the priority principle. If the phone terminal can obtain the speaking right, the scheduling server sends a speaking right message to the cluster gateway, otherwise the scheduling server sends a speaking right denial message to the cluster gateway;
  • the trunk gateway passes the next-generation network media gateway's transfer to tell the phone terminal whether the application for speaking right is successful this time by means of voice prompts.
  • the phone terminal presses the system release right button to start the process of releasing the right;
  • the key information for releasing the speaking right is forwarded to the cluster gateway through the next-generation network media gateway; the cluster gateway sends a request for the phone terminal to release the speaking right to the dispatch server;
  • the dispatch server takes back the right to speak.
  • the soft switch module sends a hang-up message to the cluster gateway after the phone terminal hangs up;
  • the cluster gateway notifies the cluster dispatch server that the telephone terminal has exited the call
  • the dispatch server will delete the telephone terminal from the calling member according to this instruction.
  • the dispatch server notifies the cluster gateway to let the designated telephone terminal exit the cluster call;
  • the cluster gateway notifies the softswitch module to release the specified phone terminal
  • the soft switch module notifies the telephone terminal of the call end
  • the softswitch module releases the network resources previously allocated for the telephone terminal
  • the softswitch module answers the trunking gateway and releases the phone terminal.
  • the cluster gateway releases the network resources previously allocated for the phone terminal
  • the cluster gateway answers the dispatch server, and the telephone terminal has exited the cluster call.
  • the gateway control the cluster media gateway using Megaco protocol or MGCP protocol.
  • the foregoing system for interconnecting the digital trunking system with the ordinary telephone system in which, if the user initiates a trunk group call, the number dialed by the user is a trunk group number, and the group number corresponds to two or more For a cluster user, the dispatch server will add multiple users to the call. If a private call is initiated, the number dialed by the user is the cluster number of the called user, which corresponds to only one cluster user.
  • the method and system for realizing interconnection and interoperability between the digital trunking system and the ordinary telephone system of the present invention, and the digital trunking system in the system mainly realizes interconnection and interworking with the ordinary telephone system through the next generation network, that is, the digital trunking system provides the interconnection and interworking interface with the next generation network.
  • the first generation network connects the ultimate telephone system network.
  • the trunking gateway in the digital trunking system is mainly responsible for the signal format conversion and media format conversion between the digital trunking system and the next-generation network. When the ordinary telephone system sends the signaling or media to the digital trunking system, the trunking gateway converts it to the format of the digital trunking system.
  • the trunking gateway converts it to The format of the ordinary telephone system, so as to resolve the differences in signaling and media formats between the two communication systems.
  • the interconnection scheme between the digital trunking system and the ordinary telephone system adopts a standard IP signaling protocol, and the ordinary telephone system does not need to make any changes to the trunking service, so that the implementation method is simple, the digital trunking system application range is effectively expanded, and Solve the advantages of telephone terminals participating in trunking calls.
  • FIG. 1 is a structural diagram of the interconnection network of the digital trunking system and the ordinary telephone system of the present invention.
  • FIG. 2 (a) is a diagram of the interworking protocol interface of the digital trunking system and the ordinary telephone system of the present invention.
  • Figure 2 (b) is an external protocol interface diagram of the cluster gateway of the present invention.
  • FIG. 3 is a group call establishment flowchart of a telephone terminal as a trunk group call call according to the present invention.
  • FIG. 4 is a group call establishment flowchart of a telephone terminal of the present invention as a trunk group call.
  • FIG. 5 is a flowchart of a process for applying for a speaking right by a telephone terminal according to the present invention.
  • FIG. 6 is a flowchart of a process for releasing the speaking right of the telephone terminal according to the present invention.
  • FIG. 7 is a flowchart of a process for exiting a trunk call by a telephone terminal of the present invention.
  • FIG. 8 is a flowchart of a process for forcing a telephone terminal to exit a trunk call in the digital trunking system of the present invention. detailed description
  • NGN Voice over IP
  • VoIP Voice over IP
  • NGN Next Generation Network
  • the NGN network has provided an interworking method with the traditional circuit-switched telephone network. Therefore, through the transfer of the NGN network, this solution can also complete the interconnection and interconnection between the digital trunking system and the analog telephone system.
  • the ordinary telephone system includes a traditional analog telephone system and an IP-based NGN network, but only when the trunking system and the analog telephone system communicate with each other through NGN.
  • the method for interconnecting the digital trunking system and the ordinary telephone network includes a telephone terminal as a calling party to initiate a trunk call, a telephone terminal as a called party to join a trunk call, a telephone terminal applying for a speaking right, a telephone terminal releasing a speaking right, and a telephone terminal actively There are several methods to exit the trunk call and the digital trunk system to force the telephone terminal to exit the trunk call.
  • Figure 1 shows the network structure of the digital trunking system and the ordinary telephone system. In the process of achieving interconnection, the cluster gateway 1 plays a very important role.
  • the cluster gateway 1 can be logically divided into two devices: a cluster signaling gateway 11 and a cluster media gateway 12.
  • the main functions of the cluster signaling gateway 11 are as follows: Signaling gateways when interfacing with other communication systems, such as systems such as NGN and PoC (PTT over Cellular, a digital trunking system); signaling gateways roaming between different service areas; control cluster media gateways; maintenance and scheduling servers Communication link.
  • NGN and PoC PTT over Cellular, a digital trunking system
  • the trunk media gateway 12 undertakes the following main functions: distributing voice media streams; maintaining and scheduling voice links between servers to undertake the format conversion of voice media streams between digital trunking systems and ordinary telephone systems; and playing prompts.
  • the H.323 protocol or the SIP protocol can be used to implement signaling interaction, and the Real-time Transport Protocol / RTP Control Protocol (RTP / RTCP) protocol is used. Transport voice media streams.
  • the cluster signaling gateway 11 may use the Megaco (Next Generation Network Media Gateway Control, Media Gateway Control, referred to as Megaco) protocol or the MGCP (Next Generation Network Media Gateway Control Protocol, Media Gateway Control Protocol, or MGCP) protocol. Controls the cluster media gateway 12.
  • the simplex of the terminal voice is the basic voice of the trunking service. That is, under normal circumstances, the trunking terminal cannot hear the speech of other users when speaking. Only one person can speak at the same time.
  • the media stream directions corresponding to these terminals can only receive and cannot send.
  • the media stream transmission directions corresponding to the phone terminals are only receiving and cannot send, that is, they are in a listening state and have not obtained the right to speak.
  • his voice can be duplex.
  • the trunking signaling gateway sets the media flow direction of the trunking media gateway to be bidirectional, that is, it can send or receive.
  • the following describes the telephone terminal as a calling party to initiate a trunk call, the telephone terminal as a called party to join a trunk group call, the telephone terminal to apply for the right to speak, the telephone terminal to release the right to speak, the telephone terminal to exit the trunk call, and the digital trunking system forcing.
  • the telephone terminal to exit the trunk call There are several methods for the telephone terminal to exit the trunk call.
  • trunk group call setup process As shown in Figure 3, when a telephone terminal is the initiator of a trunk group call, the trunk group call setup process is as follows:
  • Step 301 The telephone terminal dials the number of the trunk group call and initiates the trunk group call;
  • Step 302 After the softswitch analyzes the home location of the number according to the trunk group call number dialed by the phone, it will send an invitation request to the trunk signaling gateway of the digital trunk system;
  • Step 303 The cluster signaling gateway tells the softswitch that it is trying to establish a call
  • Step 304 The cluster signaling gateway sends a cluster call request message to the dispatch server to inform the telephone terminal to initiate a cluster group call.
  • Step 305 The dispatch server sends an access authentication request to the cluster home register to authenticate the telephone terminal and verify the correctness of the cluster group call number.
  • Step 306 If the authentication is successful, the cluster home register will send an access authentication response message to the dispatch server, and at the same time notify the dispatch server of the information of all group members of the group call, otherwise the dispatch home register will reject the group call request of the telephone terminal. ;
  • Step 307 In the case of authentication, the dispatch server pages all activated wireless wireless terminals according to the group member information returned by the cluster home register, and adds these terminals to the trunk call after the terminal paging response is confirmed;
  • Step 308 If there is no transmission channel carrying cluster signaling between the dispatch server and the cluster signaling gateway, a channel carrying cluster signaling will be established between them.
  • Step 309 If there is no transmission channel carrying the cluster media stream between the dispatch server and the cluster media gateway, a channel for transmitting cluster voice will be established between them.
  • Step 3 ⁇ After the above work is completed, the dispatch server notifies the trunking signaling gateway that the call is set up.
  • Step 311 The trunking signaling gateway notifies the trunking media gateway to allocate resources for the media stream of the group call through signaling interaction with the trunking media gateway. Including the allocation of media stream context, terminals, etc .;
  • Step 312 The cluster signaling gateway then notifies the softswitch that the call is successfully established
  • Step 313 The softswitch notifies the next-generation network media gateway of allocating resources for the media stream of the call, including the context and terminal for allocating the media stream, by interacting with the next-generation network media gateway signaling.
  • Step 314 Next-generation network media gateway Notify the phone terminal that the call was successfully established;
  • Step 315 The dispatch server notifies the trunking signaling gateway that the speaking right of the trunking call has been granted to the call originator, that is, the telephone terminal.
  • Step 31 6 The cluster signaling gateway modifies the media stream attribute corresponding to the phone terminal in the cluster media gateway to only receive, so that only the media stream sent by the phone terminal can pass through;
  • Step 317 The cluster media gateway sends a voice prompt to the telephone terminal through the next-generation network media gateway, that is, the telephone terminal is notified to obtain the right to speak, and the telephone terminal starts to speak.
  • a trunk call there are generally two situations in which a telephone terminal is called, one is that the telephone terminal is included in a group that includes a trunk call, but he is not the initiator of the trunk call, and the other is that the trunk call is a A private call to one, and the telephone terminal is the person being called.
  • the process for establishing a telephone terminal as a called party is as follows:
  • Step 401 A terminal initiates a call for a trunk group call, and the initiator may be an ordinary trunk terminal or a telephone terminal;
  • Step 402 The dispatch server sends an access authentication request to the cluster home register to authenticate the group call.
  • Step 403 If the call authentication is passed, the cluster home register will send an access authentication response message to the dispatch server, and at the same time inform the dispatch server of all group members of the group call, otherwise the cluster group call will be rejected;
  • Step 404 The scheduling server pages all activated wireless terminals of the cluster according to the feedback of the group member information
  • Step 405 The scheduling server finds that the group of users to be paged includes a telephone terminal, and the scheduling server sends a call connection request to the cluster signaling gateway, and the connected object is the telephone terminal;
  • Step 406 The cluster signaling gateway sends an invitation request to the softswitch, and the invited object is a telephone terminal.
  • Step 407 the softswitch responds that the cluster signaling gateway is trying to call the telephone terminal
  • Step 408 The softswitch then notifies the next-generation network media gateway to allocate resources of the media stream of the call, including the context, terminal, etc., for allocating the media stream through signaling interaction with the next-generation network media gateway.
  • Step 409 the next-generation network media gateway sends a ringing message to the telephone terminal
  • Step 410 The called user picks up the phone and confirms to join the group call.
  • Step 411 the softswitch notifies the trunking signaling gateway that the telephone terminal has been called, and confirms that the telephone terminal has joined the group call;
  • Step 412 The trunking signaling gateway forwards to the dispatch server that the telephone terminal has been paged into the trunking call;
  • Step 413 If there is no transmission channel carrying the cluster signaling between the dispatch server and the cluster signaling gateway, a channel carrying the cluster signaling will be established between them.
  • Step 414 If there is no cluster media stream between the dispatch server and the cluster media gateway, A transmission channel, a channel for transmitting trunked voice will be established between them;
  • Step 415 The cluster signaling gateway notifies the cluster media gateway to allocate resources of the media stream of the group call through signaling interaction with the cluster media gateway, including allocating media stream context, terminals, etc .;
  • Step 416 The dispatch server notifies the trunking signaling gateway to grant the speaking right to the originator of the trunking call. Since the default media stream direction in the trunking media gateway can only be sent, the trunking signaling gateway is not required to modify the media this time. Flow direction
  • Step 417 The dispatch server notifies the group call initiator that the speaking right has been granted to it and can start speaking.
  • Both telephone terminals and trunk terminals can apply to speak 3 ⁇ 4 Their applications are sent to the dispatch server uniformly, and the dispatch server decides. The following describes the procedures for the telephone terminal to apply for the right to speak and the telephone terminal to release the right to speak with reference to Figs. 5 and 6 respectively.
  • FIG. 5 describes a processing flow for a telephone terminal to apply for a speaking right, including the following steps: Step 501: The telephone terminal applies for obtaining a speaking right, and the telephone terminal may press a button for applying for a speaking right agreed by the system to apply for a speaking right, such as "* ", Etc., these can be used as keys to apply for speaking rights;
  • Step 502 The next-generation network media gateway forwards the key information of the phone terminal to the cluster media gateway, which is sent through the RTP stream;
  • Step 503 The cluster media gateway forwards the telephone terminal's request for speaking right to the dispatch server through the cluster signaling gateway;
  • Step 504 The dispatch server judges whether the telephone terminal can obtain the right to speak at this time according to the principle agreed upon by the system. If it can obtain the right to speak, execute 5041, otherwise execute 5042.
  • the scheduling server usually grants the right to speak to the user with the highest priority of the user currently applying for the right to speak, and the terminal that is currently speaking also participates in the comparison. When the priority is the same, the terminal that first applies for the right to speak has priority to obtain the right to speak;
  • step 5041 In the case where the telephone terminal applying for the speaking right can obtain the speaking right, if the speaking right at this time has been granted to the ordinary cluster terminal, the dispatch server will execute 506, otherwise directly execute 507;
  • Step 506 The dispatch server releases the speaking right of the cluster terminal.
  • Step 507 The dispatch server notifies the trunking signaling gateway of the right to speak to the telephone terminal.
  • Step 509 The cluster media gateway prompts the phone terminal to grant the right to speak through the next-generation network media gateway, and then executes 511;
  • Step 5042 If the telephone terminal cannot obtain the right to speak at this time, the dispatch server will reject the application for the right to speak through the cluster signaling gateway;
  • Step 510 The cluster media gateway voice prompts the telephone terminal through the next-generation network media gateway, and the right to speak application is rejected, and then 511 is performed;
  • FIG. 6 describes the processing flow for releasing the speaking right of the phone terminal, including the following steps: Step 601: The phone terminal presses the button for releasing the speaking right agreed by the system to release the speaking right, such as
  • Step 602 The next-generation network media gateway sends the key information for releasing the right to the cluster media gateway through the RTP stream;
  • Step 603 The cluster media gateway notifies the cluster signaling gateway, and the telephone terminal releases the right to speak.
  • Step 604 The cluster signaling gateway notifies the dispatch server, the phone terminal releases the right to speak.
  • Step 605 The dispatch server recovers the right to speak.
  • the digital trunking system can also actively release the right to speak.
  • the right to speak is granted to the phone terminal, if the phone terminal has not spoken for more than the specified time of the system, or the length of the current speaking time of the phone terminal has exceeded the maximum speaking time set by the digital trunking system, the dispatch server will directly release the phone terminal. The right to speak does not need to wait until the telephone terminal actively releases the right to speak.
  • Figure 7 describes a method for a telephone terminal to exit a trunk call, including the following steps:
  • Step 701 When the phone terminal wants to exit the group call, it can directly hang up the phone;
  • Step 702 The soft switch sends a call termination message to the cluster signaling gateway after the telephone terminal hangs up.
  • Step 703 The cluster signaling gateway notifies the dispatch server that the telephone terminal has exited the group call.
  • Step 704 The dispatch server will delete the telephone terminal from the cluster call member according to this instruction.
  • Figure 8 describes a method for a digital trunking system to force a telephone terminal to exit a trunk call including the following steps:
  • Step 801 The dispatch server notifies the trunking signaling gateway, and causes the designated telephone terminal to exit the trunking call. Called
  • Step 802 the cluster signaling gateway notifies the soft switch to release the designated phone terminal
  • Step 803 the soft switch notifies the telephone terminal of the call end
  • Step 804 the softswitch notifies the next-generation network media gateway to release the network resources previously allocated for the phone terminal;
  • Step 805 The softswitch answers the cluster gateway, and the phone terminal is released.
  • Step 806 The cluster signaling gateway notifies the cluster media gateway to release the network resources previously allocated to the telephone terminal.
  • Step 807 The cluster signaling gateway answers the dispatch server, and the telephone terminal has exited the cluster call.
  • the trunk group call is taken as an example to describe the interconnection and interworking between the digital trunking system and the ordinary telephone system.
  • This method can also be used for private trunking calls between the digital trunking system and the ordinary telephone system. The point is that a private call occurs between two terminals, and there can be multiple terminals for group calls.
  • their establishment process is basically the same, and the methods of applying for speaking rights and releasing their speaking rights are also consistent.
  • a telephone terminal is used as an example for the digital trunking system and The interconnection of the ordinary telephone system is described. This method is also applicable to the case of multiple telephone terminals.
  • a cluster media gateway a group call will be assigned a context corresponding to it. In this context, there can be multiple terminals. One terminal corresponds to a telephone terminal.
  • the cluster signaling gateway is responsible for the context, the media stream terminal, and the telephone terminal and the cluster. Relationship between calls.
  • the cluster signaling gateway When a telephone terminal is granted the right to speak, the cluster signaling gateway will set the media stream transmission direction corresponding to the speaker in the cluster media gateway to only be able to connect and the media stream transmission direction corresponding to other phone terminals will be set to only send .
  • the trunk signaling gateway When the right to speak is granted to the trunk terminal, the trunk signaling gateway will set the media stream transmission direction corresponding to all phone terminals in the trunk media gateway to send only.
  • the trunking terminal and the base station do not need to perform direct signaling and voice interaction with the ordinary telephone system, and do not need to worry about whether ordinary telephone terminals participate in the call;
  • the dispatching server is responsible for maintaining the cluster call that the cluster terminal and the ordinary telephone terminal participate in, performing signaling interaction with the cluster signaling gateway to complete the cluster call control of the ordinary telephone, and performing media interaction with the cluster media gateway to complete the voice forwarding work related to the ordinary telephone;
  • the cluster home register is responsible for maintaining the terminal type, user information, and group information of the cluster terminal and the ordinary telephone terminal, and for the authentication and charging of the cluster call for the cluster terminal and the ordinary telephone terminal.
  • the cluster signaling gateway is mainly responsible for the cluster system and ordinary telephone. Signaling translation between systems, signaling interaction with the softswitch module to complete trunk call connection control, control cluster media gateway resources, and maintain and schedule communication links between servers;
  • the cluster media gateway is mainly responsible for distributing voice media streams, maintaining and scheduling the voice link between servers, and responsible for format conversion of voice media streams between digital trunking systems and ordinary telephone systems, and playing prompts;
  • the soft switch module is responsible for maintaining the call of the ordinary telephone terminal, and performing signaling interaction with the cluster signaling gateway to complete the connection control of the cluster call and control the resources of the next-generation network media gateway;
  • the next-generation network media gateway is mainly responsible for accepting the control of the softswitch module and forwarding the voice media stream; the telephone terminal can participate in the cluster call as the terminal of the cluster call, that is, it can initiate the cluster call as the calling party, or it can passively participate in the cluster call as the called party .
  • the method and system for realizing interconnection and interoperability between the digital trunking system and the ordinary telephone system of the present invention, and the digital trunking system in the system mainly realizes interconnection with the ordinary telephone system through the next generation network. That is, the digital trunking system provides the interconnection and interworking interface with the next generation network.
  • the first generation network connects the ultimate telephone system network.
  • the trunking gateway in the digital trunking system is mainly responsible for the signal format conversion and media format conversion between the digital trunking system and the next-generation network. When the ordinary telephone system sends the signaling or media to the digital trunking system, the trunking gateway converts it to the format of the digital trunking system.
  • the trunking gateway converts it to The format of the ordinary telephone system, so as to resolve the differences in signaling and media formats between the two communication systems.
  • the interconnection scheme between the digital trunking system and the ordinary telephone system adopts a standard IP signaling protocol, and the ordinary telephone system does not need to make any changes to the trunking service, so that the implementation method is simple, the digital trunking system application range is effectively expanded, and Solve the problem of telephone terminal participating in the trunk call.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

Cette invention concerne un procédé servant à interconnecter un système de groupe numérique et un réseau téléphonique publique, incluant des aspects, tels que: poste téléphonique appelant lançant un appel de groupe, poste téléphonique appelé participant à un appel de groupe, poste téléphonique demandant le droit de parler, poste téléphonique libérant le droit de parler, et poste téléphonique quittant l'appel de groupe à son initiative, notamment. Cette invention permet de surmonter les inconvénients des systèmes de groupes numériques de l'état actuel de la technique, tel que: étroitesse de la plage d'application, grande difficulté de mise en oeuvre des capacités techniques et grande complexité de contrôle du système; elle permet d'étendre la plage d'application du système de groupe numérique, elle simplifie la mise en oeuvre des compétences techniques et la complexité de contrôle du système et elle résout le problème de participation du poste téléphonique à l'appel de groupe.
PCT/CN2005/000448 2004-06-04 2005-04-05 Procede et systeme pour l'interconnexion d'un systeme de groupe numerique et d'un systeme telephonique publique WO2005120035A1 (fr)

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