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WO2005006650A1 - Procede et noeuds pour communication omnibus - Google Patents

Procede et noeuds pour communication omnibus Download PDF

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Publication number
WO2005006650A1
WO2005006650A1 PCT/EP2003/007469 EP0307469W WO2005006650A1 WO 2005006650 A1 WO2005006650 A1 WO 2005006650A1 EP 0307469 W EP0307469 W EP 0307469W WO 2005006650 A1 WO2005006650 A1 WO 2005006650A1
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WO
WIPO (PCT)
Prior art keywords
message
server
sending
ptt
conference session
Prior art date
Application number
PCT/EP2003/007469
Other languages
English (en)
Inventor
Joerg Christian Ewert
Martin Stümpert
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/EP2003/007469 priority Critical patent/WO2005006650A1/fr
Priority to AU2003260307A priority patent/AU2003260307A1/en
Publication of WO2005006650A1 publication Critical patent/WO2005006650A1/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
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
    • H04L12/1818—Conference organisation arrangements, e.g. handling schedules, setting up parameters needed by nodes to attend a conference, booking network resources, notifying involved parties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
    • H04L12/1827—Network arrangements for conference optimisation or adaptation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H04W76/45—Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1836—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with heterogeneous network architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices

Definitions

  • the invention relates to a method and devices to enable a participating of a terminal operating compliant to a circuit switched transmission protocol in a conference session for distributing messages among a group of te ⁇ ninals operating compliant to a packet switched transmission protocol.
  • IP multimedia services For packet based telecommunication networks such as GPRS (General Packet Radio Service) networks and EDGE (Enhanced Data rates for GSM Evolution) networks, both packet based extensions of GSM (Global System for Mobile Communication) networks, IP (internet protocol) multimedia services have been developed providing communication using multimedia streams.
  • IP multimedia service that has been developed for packet based networks provides communication within a group of users of packet switched terminals by exchanging voice messages. Said service is known as push-to talk service or as Ericsson Instant Talk.
  • the group of users is administrated by a server that registers the users for a session. During a session a registered terminal can send a talk request followed by a voice message towards the server.
  • the server takes part in establishing packet-based bearers to the different terminals, which participate in the session.
  • the server buffers the voice message and sends the voice message via the established bearers towards the participating packet switched terminals. After the message has been send, an end of the voice message is detected and the packet-based bearers towards the participating terminals are released.
  • the service enables the communication within a group for a long time and at the same time uses scarce radio resources efficiently. However the provision of the service is limited to users of packet- based terminals. Summary of the invention
  • a method accordmg to the invention for enables a first terminal adapted to operate compliant to a circuit switched transmission protocol to participate in a conference session for distributing messages among a group of terminals adapted to operate compliant to a packet switched transmission protocol.
  • the invented method comprises the steps of: registering a participation of the first terminal in the conference session by a server administrating the group, receiving a request for sending a message for the conference session, setting up a circuit switched bearer for transmitting the message, sending the message according to either the packet switched protocol or the circuit switched protocol, buffering the message, converting the message from a payload format according to the packet switched transmission protocol to a payload format according to the circuit switched transmission protocol or vice versa, and sending the converted message.
  • a call setup message indicating the request can be routed towards the server.
  • a further method accordmg to the invention enables a first terminal to participate in a conference session by a server.
  • the first terminal is adapted to operate compliant to a circuit switched transmission protocol
  • the conference session is used for distributing messages among a group of terminals adapted to operate compliant to a packet switched transmission protocol
  • the server is administrating the group.
  • the method comprises the following steps executed by the server: registering a participation of the first terminal in the conference session, receiving a request for sending a message for the conference session, taking part in setting up a bearer for transmitting the message, receiving a message according the packet switched protocol, buffering the message, and sending the message.
  • a call setup message indicating the request can be received by the server.
  • the server is adapted to initiate a releasing of the circuit switched bearer after a detecting of an end of the message.
  • the server is adapted to initiate a sending of silence frames via the circuit switched bearer after a detecting of an end of the message.
  • the bearer can be kept and be ready for a fast transmission of a further request for sending a message from the terminal.
  • the server is adapted to receive a request for sending a message, which is sent by the first terminal via the circuit switched bearer. This is advantageous, as existing messages can be used by the first terminal to indicate the talk request. Existing circuit switched terminals can therefore be used in the method.
  • the request for sending a message is detected by the server using tone detection. This provides a fault tolerant and reliable method to indicate a talk request.
  • the message is a voice message and the request for sending a message is detected by the server using voice detection or voice recognition. This provides the possibility to initiate the talk request via voice control to the user of the first terminal. This is a comfortable way of initiating the talk request.
  • a core network node enables participating of a first terminal operating compliant to a circuit switched transmission protocol in a conference session for distributing messages among a group of users of terminals operating compliant to a packet switched transmission protocol.
  • the core network node comprises means for routing a call set up message indicating a request for a participation of the first terminal in the conference session towards a server administrating the group.
  • the core network node comprises interfaces for sending and receiving messages and a processing system adapted to process a request for sending a message for the conference session and to forward the request towards the server administrating the group.
  • the processing system is adapted to process a message indicating an end of a message for the conference session and to forward the indicating message towards the server administrating the group.
  • a server is used for for administrating a group of terminals operating compliant to a packet switched transmission protocol.
  • the server enables the group of terminals to exchange messages in a conference session.
  • the server comprises an interface for receiving a request for sending a message for the conference session, signaling means for establishing and releasing a bearer for transmitting a message, interfaces for sending and receiving messages, a memory for buffering the messages, an interface for receiving signaling messages, a control means for administrating the group and a processing means for distributing the messages.
  • the server enables a further terminal operating compliant to a circuit switched transmission protocol to participate in the conference session.
  • the control means is adapted to register the participation of the further terminal in the conference session.
  • the server comprises an interface for receiving a request for sending a message for the conference session from the further terminal.
  • the processing means is adapted to initiate releasing a circuit switched bearer towards the further terminal upon a detecting of an end of the message for the conference session.
  • the processing means is adapted to initiate sending silence frames via a circuit switched bearer towards the further terminal upon a detecting of an end of the voice message.
  • the bearer can be kept and be ready for a fast transmission of a further request for sending a message from the terminal.
  • the server comprises tone detection means for detecting the request for sending the message from the further terminal. This provides a fault tolerant and reliable method to indicate the request for sending the message.
  • the server comprises voice detection or voice recognition means for detecting a talk request from the further terminal. This provides the possibility to initiate the talk request via voice control to the user of the first terminal. This is a comfortable way of initiating the talk request.
  • the server it is implemented using different network nodes comprising a first node for administrating the group of terminals and a second node for enabling the group of terminals to exchange messages in the conference session.
  • a Media gateway enables participating of a first terminal operating compliant to a circuit switched transmission protocol in a conference session for distributing messages among a group of terminals operating compliant to a packet switched transmission protocol.
  • the media gateway comprises interfaces for sending and receiving messages according to the packet switched and the circuit switched protocol and the media gateway comprises message conversion means for converting a message for the conference session from a payload format according to the packet switched protocol to a payload format according to the circuit switched protocol.
  • the Media gateway comprises at least one of tone detection, voice detection or voice recognition means for detecting a request for sending a message for the conference session from the first terminal and the Media gateway comprises a processing system that is adapted to initiate a sending of a message indicating the request for sending the message for the conference session towards a server administrating the group of terminals.
  • the Media gateway comprises means for detecting an end of the message for the conference session and the processing system is adapted to initiate a sending of a message indicating the end of the message towards a server administrating the group of terminals.
  • the means for detecting the end of the message for the conference session comprises the voice detection or voice recognition means.
  • Fig. 1 depicts a part of a network architecture for distributing a voice message within a group of packet switched and circuit switched terminals according to the invention.
  • Fig. 2 depicts a message sequence for sending a voice message by a circuit switched terminal within a conference session as invented.
  • Fig. 3 depicts a message sequence for sending a voice message within a conference session towards a circuit switched terminal according to the invention.
  • Fig. 4 depicts a core network node enabling the routing of a participation request for the conference session according to the invention.
  • Fig. 5 depicts a server as invented for administrating a group of terminals and enabling to exchange voice messages between the terminals.
  • Fig. 6 depicts a Media Gateway as invented for handling media streams.
  • Figure 1 depicts a network architecture for enabling a terminal operating compliant to a circuit switched transmission protocol, in the following called shortly the circuit switched terminal, to participate in a conference session for distributing voice messages within a group of terminals operating compliant with a packet switched transmission protocol, called herein shortly the group of packet switched terminals.
  • the network architecture of figure 1 is appropriate for performing the message exchange procedures described in more detail for the figures 2 and 3.
  • the network architecture comprises a MS (mobile station) 301 as a terminal of the group of packet switched terminals.
  • the group of terminals is administrated by the PTT (push- to-talk) server 303.
  • Subscriber data related to the terminals in the group is stored related to the subscribers in a subscriber database 313 of a CSCF (call session control function) 310, that is connected to the MS 301 via SIP (session initiation protocol) interface 311.
  • a group database 312 in the PTT server 303 is adapted to communicate with the subscriber database 313 in the CSCF 310 via a data exchange interface 314 and to a mobile subscriber data storage 315 in the MS 301 via a subscriber data exchange interface 302.
  • a session profile 309 is stored for a for conference sessions that is administrated by the PTT server 303.
  • the session profile 309 comprises for instance an MSISDN (Mobile Station Integrated Services Digital Network) number of the MS 301 and an ISDN (Integrated Services Digital Network) number of the circuit switched terminal residing in a PSTN (public switched telephone network) 308. Furthermore a starting time, a duration and, by that, an ending time for the session is stored in the session profile 309.
  • the PTT server 303 comprises a call control unit 316 participating in call control signalling procedures for the conference session and a media streaming unit 317 for processing media streams and participating in user-plane signalling procedures for the conference session.
  • the PTT server 303 is connected to the PSTN 308 via a MGCF (Media Gateway Control Function) 305 and via a MGW (Media Gateway) 307.
  • the MGW 307, the MS 301, and the media streaming unit 317 of the PTT server 303 are interconnected by a RTP (real time protocol) interface 306.
  • the CSCF 310, the MGCF 305, and call control unit 316 of the PTT server are interconnected via a SIP (session initiation protocol) interface 304.
  • Figure 2 depicts a sequence of messages that are exchanged during a sending of a message for a conference session by a circuit switched terminal CST.
  • the message for the conference session can be a voice message, a message comprising a video sequence, a picture message, a text message, or any combination of these messages.
  • the sequence of messages is exchanged between instances of a telecommunication network.
  • instances are a mobile station MS, the circuit switched terminal CST, and instances of a core network of a mobile network.
  • the core network comprises a call session control function CSCF, a home subscriber server HSS, a server PTT, a media gateway control function MGCF, a Media Gateway MGW, and a signalling gateway SG.
  • the call session control function CSCF is an IN (intelligent network) entity that is part of a network architecture used for providing a service for distributing messages for the conference session.
  • This network architecture further comprises a server PTT administrating the group of terminals operating compliant to a packet switched transmission protocol, in the following called shortly the group of packet switched terminals.
  • the network architecture further comprises the Media Gateway MGW handling payload and user-plane signalling as well as and the Media Gateway Control function MGCF which takes part in the call control signalling for the conference session.
  • the conference session is used for distributing messages among the group of packet switched terminals.
  • the mobile station MS is a terminal of the group of packet switched terminals. Subscriber data for the mobile station MS is stored in the home subscriber server HSS.
  • the circuit switched terminal CST can be a fixed terminal of a PSTN (Public Switched Telecommunications Network) that is connected to the mobile network by the signalling gateway SG.
  • the circuit switched terminal CST can be a mobile terminal in a mobile network.
  • Establishing the group of terminals comprises registering an MSISDN (Mobile Station Integrated Services Digital Network Number) for each terminal of the group. Furthermore a starting time and an ending time can be defined for the session.
  • MSISDN Mobile Station Integrated Services Digital Network Number
  • a starting time and an ending time can be defined for the session.
  • a number according to the EJ64 of the ITU (International Telecommunication Union) used for registering to and/ or reaching the group is provided to the user of circuit switched terminal CST.
  • the EJ64 number can be sent to the circuit switched terminal CST user via an SMS (short message service) message.
  • a call setup a message comprising the EJ64 number as called party number and indicating a request for a participation of the circuit switched terminal CST in the conference session is sent is by the circuit switched terminal CST towards the server PTT.
  • a first IAM (initial address message) 11 is sent from the circuit switched terminal CST to the signalling gateway SG
  • an IP (internet protocol) IAM 12 is sent from the signalling gateway SG to the Media gateway control function MGCF
  • a first SIP (session initiation protocol) invite message 13 is sent from the Media gateway control function MGCF to the server PTT.
  • the Media gateway control function MGCF comprises means for routing the call set up message comprising the EJ64 number towards the server PTT.
  • the EJ64 number could e.g. comprise a prefix indicating a participation request for a session and the Media gateway control function MGCF could comprise a routing table for recognizing the prefix and routing the SIP invite message 13 towards the server PTT.
  • the server PTT registers the participation of circuit switched terminal CST in the conference session.
  • the server acknowledges the reception of the call set up message and the participation of the circuit switched terminal CST in the session.
  • the acknowledgement can be implemented by sending a SIP '200 OK' message from the server PTT to the Media gateway control function MGCF in response to the SIP invite message 13.
  • the Media Gateway control function MGCF forwards the acknowledgement by sending of an IP-ANM (answer message).
  • the signalling gateway SG converts the IP-ANM to an ANM and sends it to the circuit switched terminal CST.
  • the circuit switched terminal CST sends a request for sending a message for the conference session towards the server PTT, i.e. a request that the circuit switched terminal CST is to be enabled to send a message for the conference session towards the server PTT.
  • a request for sending the message will be called a talk request.
  • the request for sending a message can be sent in a further call set up procedure comprising a further IAM from the circuit switched terminal CST to the signalling gateway SG, a further IP -IAM from the signalling gateway SG to the Media gateway control function MGCF and a further SIP invite message from the Media gateway control function MGCF to the server PTT.
  • a first context 22 for transmitting payload according to the packet switched protocol and a circuit switched bearer 21 can be set up for connecting the circuit switched terminal CST and the server PTT and the request for sending a message can be sent via the first context 22 and the circuit switched bearer 21.
  • the circuit switched bearer 21 is established between the circuit switched terminal CST and the Media Gateway MGW.
  • the first context 22 for transmitting payload is established between the Media Gateway MGW and the server PTT.
  • the circuit switched bearer 21 is a PCM (pulse code modulation) bearer.
  • the RTP real time protocol
  • the request fis sent in-band, it can be sent as a tone or as a voice signal via the circuit switched bearer 21 from the circuit switched terminal CST to the Media Gateway MGW.
  • the Media Gateway MGW recognises the request for sending a message according to the received signal and sends a user-plane signalling message indicating the request for sending a message towards the server PTT.
  • the tone or the voice signal can be transmitted further via the first context 22 between the Media Gateway MGW and the server PTT and the server PTT recognizes the request for sending a message according to the received signal.
  • the circuit switched terminal CST sends a message for the conference session message via the circuit switched bearer 21 and the first context 22.
  • the message for the conference session is converted in the Media Gateway MGW from a payload format according to the circuit switched protocol to a payload format according to the packet switched protocol.
  • the message for the conference session is buffered in the server PTT.
  • the server PTT takes part in setting up contexts for transmitting payload according to the packet switched transmission protocol towards the packet switched terminals in the group.
  • a second context 50 for transmitting payload according to the packet switched transmission protocol towards the mobile station MS is established.
  • a second SIP invite message 31 is sent from the server PTT to the call session control function CSCF and a third SIP invite message 32 is sent further from the call session control function CSCF to the mobile station MS.
  • the call session control function CSCF can perform a location query procedure towards the home subscriber server HSS.
  • the reception of the third SIP invite message 32 can be acknowledged in a response '200 OK' and the reception of the second SIP invite message can be acknowledged in a further response '200 OK'.
  • the message for the conference session is sent via the second context 50 from the server PTT to the mobile station MS.
  • the server PTT detects an end of the message for the conference session and according to the detecting of the end of the message for the conference session the server PTT initiates releasing the second context 50.
  • the detecting the end of the voice message can be performed using voice detection.
  • the circuit switched terminal CST can indicate the end of the voice message by sending a tone signal towards the server PTT.
  • the tone signal can be recognised in the Media Gateway MGW and an indication of the end of the message for the conference session can be sent to the server PTT.
  • the tone signal can be converted in the Media Gateway MGW to payload according to the packet switched transmission protocol and sent further to the server PTT.
  • the server PTT can perform tone detection and recognize the indication of the end of the voice message.
  • the server PTT Upon recognizing the end of the message for the conference session the server PTT initiates releasing the second context 50. To this end the server PTT can send a SIP BYE message 60 to the mobile station MS. The mobile station MS can acknowledge the reception of the SIP BYE message 60 in a fourth response '200 OK' message to the server PTT and the second context 50 is released.
  • the first context 22 and the circuit switched bearer 21 which together connect the circuit switched terminal CST and the server PTT are maintained to enable sending a further request for sending a message.
  • a further requestfor sending a message from the circuit switched terminal can be send as a tone or a voice message and the circuit switched terminal CST does not have to be adapted to be enabled to send the further request for sending a message.
  • the first context 22 and the circuit switched bearer 21 which together connect the circuit switched terminal CST and the server PTT are released upon detecting an end of the voice message.
  • a decision whether the first context 22 and the circuit switched bearer 21 should be released can be taken.
  • the decision can be taken in the circuit switched terminal CST e.g. according to a setting or a user input in the circuit switched terminal CST.
  • the decision can be taken depending on the type of the network connecting the circuit switched terminal CST.
  • the circuit switched bearer 21 could be released, if the network connecting the circuit switched terminal CST comprises an air interface, i.e. if the circuit switched terminal CST is a mobile terminal. If the circuit switched terminal CST is a fixed terminal, the circuit switched bearer 21 and the first context 22 can be maintained.
  • the type of the terminal can be determined by the server PTT and the server can perform the decision whether to release or maintain bearers and contexts.
  • the detecting the end of the message for the conference session can be implemented in the circuit switched terminal CST.
  • Releasing the circuit switched bearer 21 and the first context 22 can for instance be implemented by sending a REL (release) message 41 from the circuit switched terminal CST to the signalling gateway SG, sending an IP-REL (release) message 42 from the signalling gateway SG to the media gateway control function MGCF, and sending a SIP BYE message 43 from the media gateway control function MGCF to the server PTT.
  • the server PTT can reply to the SIP BYE message 43 in a SIP '200 OK' message to the media gateway control function MGCF.
  • the media gateway control function MGCF can reply to the IP-REL (release) message 42 in an IP-RLC (release complete) message to the signalling gateway SG.
  • the signalling gateway can reply to the REL (release) message 41 in a RLC (release complete) message to the circuit switched terminal CST.
  • Figure 3 depicts a sequence of messages that are exchanged during a sending of a message for a conference session by a mobile station MS.
  • the message for the conference session can be a voice message, a message comprising a video sequence, a picture message, a text message, or any combination of these messages. To that end messages are exchanged between instances of a telecommunication network.
  • the mobile station MS sends a request for sending a message for the conference session towards the server PTT, i.e. a request that the mobile station MS is enabled to a send a message for the conference session towards the server PTT.
  • the message for the conference session can be a voice message and the request for sending the message can be a talk request.
  • the request for sending the message can be send as a SIP (session initiation protocol) invite message 101 from mobile station MS to the call state control function CSCF and as SIP invite message 102 from the call session control function CSCF to the server PTT. Routing the SIP invite message 102 can comprise a location query procedure between the call session control function CSCF and the home subscriber server HSS.
  • the request for sending a message is registered in the server PTT and the server PTT acknowledges the reception of the SIP invite message 102 in a SIP response '200 OK' to the call session control function CSCF. Accordingly the call session control function CSCF acknowledges the reception of the SIP invite message 101 in a SIP response '200 OK' to the mobile station MS.
  • the server PTT recognizes the request for sending a message and initiates establishing a first context 14 for transmitting payload according to the packet switched protocol and a circuit switched bearer 142 which together connect the circuit switched terminal CST and the server PTT.
  • Establishing the first context 141 and the circuit switched bearer can be implemented for example by sending a SIP invite message 110 form the server PTT to the media gateway control function MGCF, sending an IP-IAM (initial address message) 111 from the media gateway control function MGCF to the to the signalling gateway SG and sending an IAM 112 from the signalling gateway SG to the circuit switched terminal CST.
  • the circuit switched terminal CST can respond to the IAM 112 in an ACM (acknowledgement message) and an ANM (answer message).
  • the signalling gateway SG can respond to the IP-IAM 11 in an IP- ACM (acknowledgement message) and an IP- ANM (answer message).
  • Responding of the media gateway control function MGCF to the SIP invite message 110 from the server PTT comprises sending a SIP J80 ringing' message and sending a SIP '200 OK' message.
  • a first context 120 for transmitting payload according to the packet switched protocol is set up between the mobile station MS and the PTT server for transmitting a message for the conference session as payload.
  • the RTP real time protocol
  • the RTP can be used for transmitting payload via the first context 120.
  • the second context 141 for transmitting payload according to the packet switched protocol and the circuit switched bearer 142 are set up for connecting the server PTT and the circuit switched terminal CST.
  • the second context 141 is set up between the server PTT and the media gateway MGW and the circuit switched bearer 142 is set up between the media gateway MGW and the circuit switched terminal CST.
  • the RTP real time protocol
  • the circuit switched bearer 142 can be a PCM (pulse code modulation) bearer.
  • a message for the conference session is sent by the mobile station MS to the server PTT, stored by the server PTT in a buffer and sent further to the circuit switched terminal CST.
  • Sending the message for the conference session towards the circuit switched terminal CST comprises sending the message via the second context 141 from the server PTT to the media gateway MGW, converting the voice message from a payload format accordmg to the packet switched protocol to a payload format according to the circuit switched protocol and sending the converted message via the circuit switched bearer 142 to the circuit switched terminal CST.
  • the server PTT detects an end of the message for the conference session. After said detection the server PTT can initiate releasing the first context 120 towards the mobile station MS. Alternatively the releasing of the first context 120 can be initiated by the mobile station MS.
  • the mobile station MS can send a SIP BYE message 130 to the server PTT.
  • the server PTT can acknowledge the reception of the SIP BYE message 130 in a SIP response '200 OK' message to the mobile station MS and the first context 120 between the server PTT and the mobile station MS is released.
  • the second context 141 and the circuit switched bearer 142 can be maintained to enable sending a request for sending a message from the circuit switched terminal CST via the second context 141 and the circuit switched bearer 142.
  • the server PTT sends silence frames towards the circuit switched terminal CST upon detecting the end of the voice message.
  • the silence frames are sent via the second context 141 between the server and the media gateway MGF, the silence frames are converted from a payload format according to the packet switched protocol to a payload format according to the circuit switched protocol and the silence frames are sent further via the circuit switched bearer 142 from the media gateway MGW to the circuit switched terminal CST.
  • the second context 141 and the circuit switched bearer 142 are released upon detecting an end of the message for the conference session. Detecting the end of the message can be performed in server PTT and the server PTT can initiate releasing the second context 141 and the circuit switched bearer 142. Releasing the second context 141 and the circuit switched bearer 142 can be implemented sending a SIP BYE message 151 from the server PTT to the Media Gateway Control Function MGCF, sending an IP-REL (release) message 152 from the Media Gateway Control Function MGCF to the Signalling Gateway SG and sending an REL (release) message 153 from the signalling gateway SG to the circuit switched terminal CST.
  • the circuit switched terminal CST can reply to the REL message 153 in a RLC (release complete) message to the signalling gateway SG.
  • the signalling gateway SG can reply to the IP-REL (release) message 152 in an IP-RLC (release complete) message to the media gateway control function MGCF.
  • the Media Gateway Control Function MGCF can reply to the SIP BYE message 151 in a SIP '200 OK' message to the server PTT.
  • Figure 4 depicts a core network node CN enabling participating of a first terminal operating compliant to a circuit switched transmission protocol, called herein shortly the circuit switched terminal, in a conference session for distributing messages among a group of users of terminals operating compliant to a packet switched transmission protocol.
  • the core network node CN comprises a routing table RT, an input link IL for receiving signalling messages from adjacent network nodes and an output link OL for sending signalling messages to adjacent network nodes.
  • Such signalling messages can be e.g. call set up messages.
  • the routing table RT is used for analyzing an address of a signalling message and routing the signalling message to the appropriate adjacent network node.
  • To enable participation of circuit switched terminal in the conference session a conference or group address is assigned to the conference session or to the group.
  • a call set up message comprising the conference or group address as destination address is indicating a request for participation of the circuit switched terminal in the conference session.
  • the routing table RT is configured such as to provide routing a call set up message received via the input link IL and comprising the group or conference address as destination address towards a server administrating the group.
  • the call setup message is sent towards the server administrating the group via the output link OL.
  • the core network node further comprises an interface IF for sending and receiving messages and a processing system PS adapted to process a request for sending a message for the conference session and to forward the request via the interface IF towards the server administrating the group.
  • Figure 5 depicts a server S for administrating a group of terminals operating compliant to a packet switched transmission protocol, called herein shortly the group of packet switched terminals.
  • Figure 5 depicts functional units of the server S that can be implemented in software in hardware or in any combination thereof.
  • the server S enables the group of packet switched terminals to exchange messages in a conference session.
  • the server S comprises a message interface MI, which is adapted for sending and receiving the messages, that are exchanged among the group of packet switched terminals.
  • the server comprises a signalling means SM for establishing and releasing a bearer for transmitting the messages. Said signalling means SM are also adapted to receive further signalling messages.
  • the server S further comprises a message buffer MB for storing messages and a processing system PS for administrating the group and distributing the messages within the group.
  • the processing system can be implemented in a control means for administrating the group and a separate processing means for distributing the messages.
  • the control means and the processing means can be hosted on different entities.
  • the signalling means SM connect the server S to further network nodes for exchange of call control signalling messages.
  • the message interface MI connects the server S to further network nodes for exchange of payload and user plane signalling messages.
  • the server S enables a further terminal operating compliant to a circuit switched transmission protocol and called herein shortly the circuit switched terminal to participate in the conference session.
  • the processing system PS is adapted to process a call setup message received via the signalling means SM and indicating a request for a participation of the circuit switched terminal in the conference session and to register the participation of the circuit switched terminal in the conference session.
  • the server S is further adapted to receive a request for sending a message for the conference session form the circuit switched terminal, i.e. a request to be enabled to send a message for the conference session. Said request can e.g. be received by the server S via the signalling means SM or via the message interface MI.
  • the signallmg means SM Upon detecting the request for sending the message the signallmg means SM take part in a message exchange procedure for setting up a bearer connecting the message interface MI to the circuit switched terminal.
  • a message for the conference session is received via the bearer in the message interface MI, processed by the processing system PS and forwarded to the message buffer MB.
  • the message is distributed within the group via the message interface MI.
  • the processing system PS is adapted to detect an end of the message and to initiate releasing contexts for transmitting payload according to a packet switched protocol upon said detecting of the end of the message. To that end a sequence of signalling messages can be exchanged between the signalling means SM and further network-modes.
  • the request for sending a message can be sent as a tone signal via the message interface ML
  • the processing system PS can comprise tone detection means for detecting the request.
  • the message to be distributed within the group of packet switched terminals can be a voice message.
  • the processing system PS can comprise voice detection or voice recognition means for detecting a talk request from the circuit switched terminal.
  • the voice detection or voice recognition means can be further controlled by the processing system PS to detect an end of the voice message.
  • the processing system PS can be adapted to initiate sending silence frames via a circuit switched bearer towards the circuit switched terminal upon notice of the detecting the end of the voice message.
  • the processing system PS can be adapted to initiate releasing a circuit switched bearer towards the circuit switched terminal upon notice of said detecting the end of the voice message.
  • a sequence of signallmg messages can be exchanged between the signalling means SM and further network nodes.
  • Figure 6 depicts a media gateway MGW as part of a system architecture for enabling a first terminal operating compliant to a circuit switched transmission protocol and called herein shortly the circuit switched terminal to participate in a conference session for distributing messages.
  • the conference session is used for distributing the messages among a group of terminals operating compliant to a packet switched transmission protocol, called herein shortly the group of packet switched terminals.
  • Figure 6 depicts functional entities of the media gateway that can be implemented in hardware in software or in any combination thereof.
  • the media gateway comprises a circuit switched media interface CSMI for sending and receiving messages according to a circuit switched transmission protocol and a packet switched media interface PSMI for sending receiving messages according to a circuit switched transmission protocol.
  • the media gateway MGW comprises message conversion means MC for converting a message from a payload format accordmg to the packet switched protocol to a payload format according to the circuit switched transmission protocol and vice versa.
  • a processing means PM is connected to the circuit switched media interface CSMI, the packet switched media interface PSMI and to the message conversion means MC for coordinating and controlling the units.
  • the media gateway comprises first detection means DM1, e.g. voice or tone detection means for detecting a request for sending a message from the circuit switched terminal. Said detection means are connected to the processing means PM for message exchange.
  • a request for sending a message can be received as payload in the circuit switched media interface CSMI. Said request can be detected using the first detection means DM1 and the processing means PM can initiate sending a message indicating the request towards a server administrating the group of terminals. The indicating message can be sent via the packet switched media interface PSMI.
  • the message can be a voice message.
  • the media gateway MGW can comprise second detection means DM2 for detecting an end of the message.
  • said second detection means DM2 can be voice detection means for detecting the end of the message using voice detection or voice recognition.
  • Said second detection means DM2 is connected to the processing means PM for message exchange.
  • the end of the message can be detected using the second detection means DM2 and the processing means PM can initiate sending a message indicating the end of the message towards a server administrating the group of terminals.
  • the indicating message can be sent via the packet switched media interface PSMI.
  • the first and the second detection means DM1 and DM2 can be implemented as one entity or using different entities.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention se rapporte à un procédé permettant à un premier terminal (CST) conçu pour fonctionner selon un protocole de transmission à circuit commuté afin de participer dans une conférence en vue de la distribution de messages parmi un groupe de terminaux (MS) conçu pour fonctionner selon un protocole de transmission à paquets commutés. Un message de définition d'appel (11; 12; 13) indique une demande de participation du premier terminal dans la conférence à un serveur PTT gérant le groupe. Le serveur reçoit une demande (102) permettant d'envoyer un message pour la conférence. Un module de support à circuit commuté (21) et un module de support à paquets commutés (22, 50) sont définis en vue de la transmission du message qui est envoyé, tamponné et converti à partir d'un format de charge utile d'après le protocole de transmission à paquets commutés en un format de charge utile d'après le protocole de transmission à circuit commuté ou vice versa. Le message converti est envoyé et le module de support à paquets commutés (50) est relâché.
PCT/EP2003/007469 2003-07-10 2003-07-10 Procede et noeuds pour communication omnibus WO2005006650A1 (fr)

Priority Applications (2)

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PCT/EP2003/007469 WO2005006650A1 (fr) 2003-07-10 2003-07-10 Procede et noeuds pour communication omnibus
AU2003260307A AU2003260307A1 (en) 2003-07-10 2003-07-10 Method and nodes for conference communication

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WO2006081549A1 (fr) * 2005-01-28 2006-08-03 Qualcomm Incorporated Procede et appareil d'interfonctionnement entre des systemes de telephones cellulaires a poussoir de conversation (poc) et des systemes de messagerie instantanee (im)
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GB2418796A (en) * 2004-10-01 2006-04-05 Nortel Networks Ltd Internet Protocol Media Gateway (IPMG)
RU2398358C2 (ru) * 2005-01-28 2010-08-27 Квэлкомм Инкорпорейтед Способ и устройство для взаимодействия между системой push-to-talk (рос) и системой мгновенных сообщений (im) в сети сотовой связи
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EP1708530A1 (fr) * 2005-03-29 2006-10-04 Alcatel Procédé et appareil pour implémenter un service d'appel vocal de groupe et un service d'appel donnée de groupe par respectivement commutation de cirquits ou de paquets dans un réseau mobile
WO2007081172A1 (fr) * 2006-01-13 2007-07-19 Lg Electronics Inc. Traitement de données multimédia pour service de session basé sur le protocole d'initiation de session (sip)
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DE102006031701A1 (de) * 2006-07-08 2008-01-24 T-Mobile International Ag & Co. Kg Push-To-Talk PSTN Back-to-Back User Agent zur Anbindung eines PTT Systems mit der PSTN/ISDN Welt
US8588760B2 (en) 2006-07-08 2013-11-19 T-Mobile International Ag Push-to-talk PSTN back-to-back user agent for connecting a PTT system to the PSTN/ISDN world
GB2443320B (en) * 2006-10-23 2010-07-28 Sepura Ltd Communications Systems
GB2443320A (en) * 2006-10-23 2008-04-30 Sepura Ltd Transmission of packet data in mobile communications systems
WO2009024079A1 (fr) * 2007-08-19 2009-02-26 Huawei Technologies Co., Ltd. Procédé et système pour établir un appel de communication et une libération d'appel, et équipement apparenté
WO2009125152A1 (fr) * 2008-03-31 2009-10-15 France Telecom Procede de gestion d'un service de transmission de donnees
CN102027800A (zh) * 2008-03-31 2011-04-20 法国电信公司 管理数据传送服务的方法

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