WO2007083876A1 - Procédé de réservation d'invitation à la session dans un service de communications à base de sip - Google Patents

Procédé de réservation d'invitation à la session dans un service de communications à base de sip Download PDF

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Publication number
WO2007083876A1
WO2007083876A1 PCT/KR2006/004715 KR2006004715W WO2007083876A1 WO 2007083876 A1 WO2007083876 A1 WO 2007083876A1 KR 2006004715 W KR2006004715 W KR 2006004715W WO 2007083876 A1 WO2007083876 A1 WO 2007083876A1
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WO
WIPO (PCT)
Prior art keywords
message
server
invitation
client
sending
Prior art date
Application number
PCT/KR2006/004715
Other languages
English (en)
Inventor
Young-Ae Kim
Sung-Mu Son
Original Assignee
Lg Electronics Inc.
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
Priority claimed from KR1020060045317A external-priority patent/KR100889867B1/ko
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2007083876A1 publication Critical patent/WO2007083876A1/fr

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Classifications

    • 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
    • H04L65/4061—Push-to services, e.g. push-to-talk or push-to-video
    • 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
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • 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
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]

Definitions

  • the present invention relates to a SIP based communication service, and more particularly, to an apparatus and method for reserving a session invitation in a SIP based communication service.
  • Session invitation Protocol e.g., PT
  • IM refers to communication services which one client having a set session transmits media data (i.e., talk burst) to one or more other clients.
  • media data i.e., talk burst
  • a Push Talk (PT) service is based upon a SIP to provide service providers and mobile communication users with high speed communications, and offers a Push to talk over Cellar (PoC) service for an audio data transmission, a Push To View (PTV) for a video data transmission, or Push To Data PTD) for a data transmission.
  • PoC Push to talk over Cellar
  • PTV Push To View
  • PTD Push To Data
  • the PT service allows communications between single recipients (1 :1) or between recipient groups such as group chat sessions. Hence, a PT client using the PT service can communicate with other PT clients without performing a dialing process, a waiting process for a call connection, a call connection tone providing process, and the like, thereby providing high speed communication services.
  • a PT service system users register their own information in a PT service for their subscription.
  • the users who have registered in the PT server may form (generates) a certain group, if necessary.
  • each PT user in one group to which a plurality of PT users belong requests a talk burst authority (e.g., a right to speak, a floor, etc.) from the PT server by entering a button on a PT terminal.
  • the PT server grants permission for the talk burst authority to a PT user who has requested the talk burst authority while notifying other remaining PT users of non-permission for the talk burst authority.
  • the PT user releases his talk burst authority by returning the PT button back to its original state, so as to allow the remaining PT users to request the talk burst authority again from the PT server, thereby enabling them to transmit their desired media data such as audio or video.
  • a sending server can send a session invitation message (e.g., SIP INVITE) to a receiving client periodically or non-periodically, so as to invite one client or a plurality of clients (e.g., Ad-hoc PoC group, pre-arranged and/or chat PoC group session).
  • a session invitation message e.g., SIP INVITE
  • clients e.g., Ad-hoc PoC group, pre-arranged and/or chat PoC group session.
  • the sending server sends the session invitation message (e.g., SIP INVITE) to the receiving client periodically or non-periodically regardless of a state of the receiving client (e.g., invitation-available state), which causes an increase in a network load.
  • the session invitation message e.g., SIP INVITE
  • the receiving server and a presence server separately exist in the related art, when receiving a session invitation reservation for the receiving client from the sending client via the sending server, the receiving server must access the presence server which manages status information of the receiving client, resulting in an load increase.
  • a network i.e., a control server
  • Another object of the present invention is to provide a session invitation reserving apparatus and method, which enables a sending server to effectively invite a receiving client as a receiving server informs the sending server of an invitation-available state of the corresponding receiving client.
  • a session invitation reserving method in a system which is provided with sending and receiving clients and sending and receiving servers to provide a SIP based service, the method comprising: receiving an invitation reservation request made (performed) by a sending client from a sending server; detecting (sensing) an invitation-available state of a receiving client based upon a service set value sent by the corresponding receiving client; and informing the sending server of the invitation-available state when detecting the corresponding invitation-available state of the receiving client.
  • a session invitation reserving apparatus in a system for providing a SIP based communication service, the apparatus comprising: a sending client for sending an invitation reservation message; at least one or more receiving clients which are invited by the sending client and transmit a PUBLICH message to change a service set value; a receiving server detecting (sensing) an invitation-available state of the receiving client based upon the service set value of the PUBLISH message for notification; and a sending server for sending an invitation reservation request of the sending client to the receiving server, and transmitting a session invitation message to the corresponding receiving client according to the invitation-available state notified by the receiving server.
  • the sending server is a server having a session control function
  • the receiving server is a server having a presence function
  • the session invitation reservation is requested by one of REFER message, INVITE message and PUBLISH message.
  • each message may include invitation reservation conditions such as an invitation reservation starting time, an invitation reservation ending time, a recipient and a triggering parameter.
  • the service set value indicates a set state of Answer Mode, Incoming PoC Session Barring and Simultaneous PoC Session Support.
  • the receiving server informs the invitation-available state of the receiving client through a NOTIFY message.
  • FIG. 1 is a first embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • Fig. 2 is a second embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • Fig. 3 is a third embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • Fig. 4 is a fourth embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • Fig. 5 is a fifth embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • the present invention proposes a method in which a sending server in a PT system does not send a session invitation message (e.g., SIP INVITE) to a receiving client periodically or non-periodically in order to invite the receiving client, but rather when the receiving client is in an invitation-available state (i.e., when the receiving client can be invited), a receiving server informs the sending server of the corresponding information
  • a session invitation message e.g., SIP INVITE
  • the receiving server informs the sending server of the status information of the receiving client by using a SIP NOTIFY message.
  • an invitation reservation denotes a session invitation reservation in the present invention.
  • Fig. 1 is a first embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention, which illustrates a procedure that a PT server invites a PT client in a PT system.
  • users of PT clients 10 and 14 are assumed to be PT users A and B, respectively.
  • a PT client i.e., a sending client
  • a PT server i.e., a sending server
  • an invitation reservation request message i.e., a SIP REFER message
  • a PT server i.e., a sending server
  • S 11 a plurality of PT clients
  • the PT client 11 transmits the SIP REFER message by additionally including an information message which indicates that the SIP REFER message is a message for requesting the invitation reservation. For example, a feature tag for the invitation reservation, namely, "+g.poc. reservation" is included in an accept-contact header of the SIP REFER message to be then sent. Also, the PT client 11 may use a SIP INVITE or SIP PUBLISH message in addition to the SIP REFER message when requesting the session invitation reservation.
  • SIP HEADERS Refer-To: ⁇ sip:PoC-UserB@networkB.net> Accept-Contact: *;g.poc.reservation;require;explicit
  • a PT server A denotes a PT server 12, and a PT server B denotes a PT server (i.e., a receiving server) 13.
  • a network A denotes a network which includes the PT client 11 and the PT server 12, and a network B denotes a network which includes the PT client 14 and the PT server 13.
  • the SIP REFER message denotes an implicit floor (talk burst authority) request message.
  • the PT server 12 When establishing a session between the PT clients 11 and 14, the PT server 12 which received the message should grant permission for the talk burst authority to the PT client 11 , such that the PT client 11 can transmit media data (e.g., audio, video, images, texts and files) even if it does not separately request the talk burst authority.
  • media data e.g., audio, video, images, texts and files
  • the SIP REFER message may include invitation reservation conditions such as an invitation reservation starting time, an invitation reservation ending time, a recipient and/or a triggering parameter.
  • the invitation reservation conditions may be one or plural, and be processed according to a logical operation such as AND or OR.
  • the triggering parameter is a parameter related to a setup for an invitation request when all of the recipients can be invited or when at least one or more recipients can be invited, in case of inviting plural recipients.
  • These conditions can be stored in the PT server 12 or stored in a PT XDMS using a XCAP protocol by being transmitted through a message (e.g., SIP REFER, SIP INVITE or SIP PUBLISH) for transmitting a reservation request.
  • a message e.g., SIP REFER, SIP INVITE or SIP PUBLISH
  • the PT server 12 Upon receiving the SIP REFER message, the PT server 12 sends a SIP 202 "accepted" message to the PT sever 11 to inform a successful reception of the SIP REFER message (S12).
  • the PT server 12 having received the SIP REFER message recognizes the corresponding message to be a message for requesting the invitation reservation based upon the feature tag (e.g., +g.poc.reservation) within the accept-contact header of the SIP REFER message. Thereafter, the PT server 12 sends a SIP SUBSCRIBE message to the PT client 14 (13).
  • the SIP SUBSCRIBE message is used by the PT sever 12 to send to the PT server 13 a message indicating that it should be known as to when the PT client 14 is in a state capable of being invited (i.e., in an invitation-available state).
  • the PT server 13 includes a presence function for supporting the above functions.
  • the presence function may be implemented by being physically separated from the PT server 13, or be provided within the PT server 13. If the presence function is physically implemented in the PT server 13, the SIP SUBSCRIBE message can be sent from the PT sever 12 to the PT server 13. When successfully receiving the SIP SUBSCRIBE message, the PT server 13 sends a 200 "OK" message to the PT sever 12 (S 14).
  • the PT server 13 then sends to the PT server 12 a current state of the PT client 14 (i.e., information as to whether the PT client 14 can be invited) via an initial SIP NOTIFY message according to procedures described in RFC 3265 (S15).
  • the initial SIP NOTIFY message includes information indicating a state that the PT client 14 can not be invited.
  • the PT server 12 sends a SIP 200 "OK" message to the PT server 13 after successfully receiving the SIP NOTIFY message (S16).
  • the PT server 13 detects whether the PT client 14 can be invited based upon the changed PT service set value of the PT client 14.
  • receiving by the PT server 13 the SIP PUBLISH message from the PT client 14 indicates that the PT client 14 has sent the initial SIP PUBLISH message to its home server, namely, the PT server 13, after registering in a SIP/IP core, which means the PT client 14 is in a state capable of using the PT service.
  • the PT server 13 can recognize whether the PT client 14 can be invited based upon the PT service set values (e.g., answer mode, incoming PoC session barring, simultaneous PoC session Support, etc.) of the PT client 14, the set value being included in the initial SIP PUBLISH message. For example, the PT server 13 can identify that the PT client 14 is in the invitation-available state if the incoming PoC session barring (i.e., a service set value for denying every incoming invitation message) is "active" and then is changed into "not active” through the SIP PUBLISH message when the PT client 14 sends the initial SIP PUBLISH message.
  • the PT service set values e.g., answer mode, incoming PoC session barring, simultaneous PoC session Support, etc.
  • the PT server 13 sends the SIP NOTIFY message to the PT server 12 to inform the current state of the PT client 14 (S 18).
  • the PT server 13 adds "terminated" to a Subscription-State header of the SIP NOTIFY message, thus to notify the SIP NOTIFY message is not sent any more.
  • the PT server 12 which received the SIP NOTIFY message sends a SIP 200 OK message to the PT server 13 (S19).
  • the PT server 12 thereafter sends a SIP INVITE message to the PT client 11 for invitation thereof (S20).
  • the SIP INVITE message may include a value for allowing the PT client 11 to obtain a talk burst authority for sending media data when a PT session is established.
  • the PT sever 12 upon receiving the SIP 200 OK message with respect to the SIP INVITE message from the PT client 11 , the PT sever 12 sends the SIP INVITE message to the PT server 13 to invite the PT client 14 (S22).
  • SIP INVITE message is delivered to the PT client 14 by the PT server 13
  • the PT client 14 sends the SIP 200 OK message in response to the reception of the SIP INVITE message (S24)
  • the PT server 13 sends the SIP 200 OK message to the PT server 12 (S25). Also, in the steps of S20,
  • the PT server 12 can simultaneously send the SIP INVITE message both to the PT client 11 and the PT server 13.
  • Fig. 2 is a second embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • Fig. 2 illustrates an example in which a sending PT client requests an invitation reservation from a receiving PT client using a SIP
  • the PT client 11 sets an invitation reservation starting time and an invitation reservation ending time under the invitation reservation conditions, and thereafter requests an invitation reservation for the PT client 14 from the PT server 12 using a SIP REFER message within the corresponding time duration (i.e., from the starting time to the ending time) (S21).
  • the PT server having received the SIP REFER message sends a SIP 202 "accepted" message to the PT client 11 (S22) and then sends a SIP SUBSCRIBE message to the PT server 13 (S23).
  • the PT server 13 may include a presence function which supports IETF RFC 3427 (Change Process for SIP), IETF draft and presence authorization policy (draft-ietf-simple-presence-rules-04), or a new ISP event package.
  • the presence function may be implemented by being physically separated from the PT server 13, or be provided within the PT server 13.
  • the PT server 12 can send the SUBSCRIBE message to the PT sever 13 before the invitation reservation starting time or at the invitation reservation starting time.
  • the PT server 12 can set the value of the invitation reservation ending time in an "expires" header of the SUBSCRIBE message for transmission, which means that the SIP SUBSCRIBE message is not sent any more until the SUBSCRIBE message reaches the "expires" value, and a SIP dialog is automatically closed after the "expires" value.
  • the PT server 12 sends the corresponding SUBSCRIBED message by including such information.
  • the PT server 12 sends the SUBSCRIBE message by including the invitation reservation ending time.
  • the PT sever 13 Upon the successful reception of the SUBSCRIBE message, the PT sever 13 sends a SIP 200 "OK" message to the PT server 12 (S24). The PT server 13 then sends a current state of the PT client 14 to the PT server 12 through a SIP NOTIFY message (S25).
  • Fig. 2 illustrates that the initial SIP
  • NOTIFY message includes information indicating a state that the PT client 14 can not be invited.
  • the PT server 12 sends the SIP 200 "OK" message to the
  • the PT server 13 receives a SIP PUBLISH message from the PT client 14 to check whether the PT client 14 can be invited (S27). If it is checked that the PT client 14 is in the invitation-available state within the invitation reservation time duration (i.e., from the invitation reservation starting time to the invitation reservation ending time) which is included in the SUBSCRIBE message, the PT server 13 sends the SIP NOTIFY message to the PT server 12 (S28).
  • the PT server 13 adds "terminated" to a subscription-state header when sending the SIP NOTIFY message by including the information indicating that the PT client 14 is in the invitation-available state, so as to inform no more transmission of the SIP NOTIFY message.
  • the PT server 12 which received the SIP NOTIFY message sends the
  • SIP 200 OK message to the PT server 13 (S29), and thereafter sends a SIP INVITE message to the PT client 11 for invitation thereof (S30).
  • the SIP INVITE message may include a value for allowing the PT client 11 to obtain a talk burst authority for sending media data when a PT session is established.
  • the PT server 12 Upon the reception of the SIP 200 OK message with respect to the SIP INVITE message from the PT client 11 (S31), the PT server 12 sends the SIP INVITE message to the PT server 13 to invite the PT client 14 (S32).
  • the SIP INVITE message is delivered to the PT client 14 by the PT server 13 (S33).
  • the PT server 13 sends the SIP 200 OK message in response to the reception of the SIP INVITE message (S34).
  • the PT server 12 can simultaneously send the SIP INVITE message both to the PT client 11 and the PT server 13.
  • Fig. 3 is a third embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention.
  • the third embodiment of the present invention is the same as the second embodiment of Fig. 2 excepting steps S50 and S51.
  • FIG. 2 illustrates that the PT server 12 sends the SIP INVITE message to the PT client 11
  • Fig. 3 illustrates that the PT server 12 sends to the PT client 11 the SIP NOTIFY message sent by the PT server 13
  • the SIP NOTIFY message may include a value for allowing the PT client 11 to obtain a talk burst authority for sending media data when a PT session is established.
  • the PT client 11 having received the SIP NOTIFY message sends the SIP 200 OK message to the PT server 12 (S51).
  • the PT server 12 having received the SIP 200 OK message sends the SIP INVITE message to the PT server 13 to invite the PT client 14. Steps S32 to S35 are performed accordingly.
  • Fig. 3 on the other hand, two methods by which the PT server 12 actually invites the PT client 14 with respect to the invitation reservation (i.e., SIP REFER) after receiving the SIP NOTIFY message through the step S28 may be employed.
  • a first method is to invite the PT client 14 using the SIP INVITE message when receiving the 200 OK message from the PT client 11 after sending the SIP NOTIFY message to the PT client 11.
  • a second method is to invite the PT client 14 using the SIP INVITE message (i.e., to perform the steps S32 to S35), and then send the SIP NOTIFY message to the PT client 11 to thereafter receive the 200 OK message (not shown).
  • the SIP REFER message transmitted in the step S21 may be used as a type of the SIP INVITE message.
  • Fig. 4 is a fourth embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention, which illustrates a case where a sending PT server 12 has not received from a receiving PT server 13 a SIP NOTIFY message indicating that a receiving client can be invited within an invitation reservation time duration.
  • the PT client 11 sets an invitation reservation time duration and then requests an invitation reservation for the PT client 14, however, the PT server 12 has not received the SIP NOTIFY message indicating that the PT client 14 can be invited from the PT server 13.
  • the PT server 12 sends a SIP 200 OK message to the PT server 13 (S 16).
  • the PT server 12 expires a SIP dialog based upon an "expires" header value within the SIP SUBSCRIBE message.
  • the PT server 12 sends the SIP NOTIFY message to the PT client 11 to deliver information indicating that the invitation reservation for the PT client requested by the PT client 11 can not be performed (S60).
  • the PT client 11 then sends the SIP 200 OK message to the PT server 12 in response to the SIP NOTIFY message (S61 ).
  • the SIP NOTIFY message may not include a value for allowing the PT client 11 to obtain a talk burst authority for sending media data.
  • Fig. 5 is a fifth embodiment illustrating a session invitation reserving method for a SIP based communication service according to the present invention, which illustrates a case where a sending PT client reserves an invitation for a plurality of receiving clients. That is, the fifth embodiment of the present invention includes a setup (or set value) for requesting an invitation reservation when inviting many recipients or at least one or more recipients based upon a triggering parameter included in the invitation reservation conditions of the PT client.
  • steps S21 to S35 are the same as those in Fig. 2, and a detailed explanation thereof will not be repeated.
  • a PT session is established between the PT clients 11 and 14 (S36).
  • the PT server 13 receives a PUBLISH message from a PT client 15 before the invitation reservation ending time (S37). If it is checked that the PT client 15 can be invited through the corresponding PUBLISH message, the PT server 13 sends the SIP NOTIFY message to the PT sever 12 (S38). Here, the PT server 13 adds "terminated" to a subscription-state header when sending the SIP NOTIFY message by including information regarding the PT client 15 is in the invitation-available state, thereby informing the PT server 12 no more transmission for the SIP NOTIFY message.
  • the PT server 12 After receiving the SIP NOTIFY message, the PT server 12 sends the SIP 200 OK message to the PT server 13 (S39), and then sends the SIP INVITE message to the PT server 13 to invite the PT client 15 (S40).
  • the PT server 13 that received the SIP INVITE message delivers the corresponding message to the PT client 15 (S41), and receives the SIP 200
  • the PT server 13 finally sends the SIP 200 OK message to the PT server 12 (S43).
  • the PT session is established between the PT clients 11 and 15. Accordingly, the PT client 11 can send media (e.g., audio, video, images, texts and files) to the PT client 15.
  • media e.g., audio, video, images, texts and files
  • the receiving server having the presence function informs the sending server of the corresponding information, to thereby perform session invitation operations for the receiving client. Accordingly, it is effective to decrease a load of the receiving server in the related art and also a load of the sending server required to process the session invitation reservation of one client or a plurality of clients.

Abstract

Service de communications à base de protocole d'invitation à la session (SIP), et spécifiquement dispositif et procédé de réservation d'invitation à la session permettant à un serveur à poussoir d'émission (push-to-talk, PTT) de réception de renseigner un serveur PTT d'émission sur l'information d'état (par exemple, état d'invitation disponible) propre au client PTT de réception lorsque ce client peut être invité, de manière à permettre au serveur PTT d'émission d'inviter le client PTT de réception correspondant, autrement que par l'émission, via le serveur PTT d'émission, d'un message d'invitation à la session (à savoir, SIP INVITE) à destination du client PTT de réception, périodiquement ou non périodiquement, pour l'invitation du client PTT de réception, sachant que le serveur PTT de réception renseigne de préférence le serveur PTT d'émission sur l'état d'invitation disponible du client PTT de réception par le biais d'un message SIP NOTIFIY.
PCT/KR2006/004715 2006-01-17 2006-11-10 Procédé de réservation d'invitation à la session dans un service de communications à base de sip WO2007083876A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US75902206P 2006-01-17 2006-01-17
US60/759,022 2006-01-17
US77580406P 2006-02-23 2006-02-23
US60/775,804 2006-02-23
KR1020060045317A KR100889867B1 (ko) 2006-05-19 2006-05-19 Ｓｉｐ기반의 통신 서비스에서의 세션초대 예약장치 및방법
KR10-2006-0045317 2006-05-19

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WO2007083876A1 true WO2007083876A1 (fr) 2007-07-26

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020064693A (ko) * 2002-06-14 2002-08-09 (주) 로스틱테크놀로지 접속 설정 프로토콜을 이용한 통신 서비스 품질 신호처리제공 방법
US20030053434A1 (en) * 2001-08-03 2003-03-20 At&T Corp. Method and apparatus for delivering IPP2T (IP-push-to-talk) wireless LAN mobile radio service
US20040190468A1 (en) * 2003-03-24 2004-09-30 Jaakko Saijonmaa Group communication in a communication network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030053434A1 (en) * 2001-08-03 2003-03-20 At&T Corp. Method and apparatus for delivering IPP2T (IP-push-to-talk) wireless LAN mobile radio service
KR20020064693A (ko) * 2002-06-14 2002-08-09 (주) 로스틱테크놀로지 접속 설정 프로토콜을 이용한 통신 서비스 품질 신호처리제공 방법
US20040190468A1 (en) * 2003-03-24 2004-09-30 Jaakko Saijonmaa Group communication in a communication network

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