WO2002067533A1 - Closing a sip active session - Google Patents

Closing a sip active session Download PDF

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Publication number
WO2002067533A1
WO2002067533A1 PCT/EP2001/001849 EP0101849W WO02067533A1 WO 2002067533 A1 WO2002067533 A1 WO 2002067533A1 EP 0101849 W EP0101849 W EP 0101849W WO 02067533 A1 WO02067533 A1 WO 02067533A1
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WO
WIPO (PCT)
Prior art keywords
session
drop
connection
request
network element
Prior art date
Application number
PCT/EP2001/001849
Other languages
French (fr)
Inventor
Balázs BERTÈNYI
Krisztián KISS
Gabor Bajko
Gyorgy Wolfner
Original Assignee
Nokia Corporation
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 Nokia Corporation filed Critical Nokia Corporation
Priority to PCT/EP2001/001849 priority Critical patent/WO2002067533A1/en
Publication of WO2002067533A1 publication Critical patent/WO2002067533A1/en

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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
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]

Definitions

  • the present invention relates to closing a SIP active session in a communication network system.
  • the Session Initiation Protocol is an application layer control (signaling) protocol that can establish, modify and terminate multimedia sessions or calls. These multimedia sessions include multimedia conferences, distance learning, Internet telephony and similar applications. SIP can invite both persons and "robots", such as a media storage device. SIP can invite parties to both unicast and multicast sessions. The initiator does not necessarily have to be a member of the session to which it is inviting. Media and participants can be added to an existing session.
  • BYE request is used by the endpoint to indicate to a server that it wishes to release the call.
  • the BYE request is forwarded like an INVITE request and may be issued by either caller or callee.
  • a party receiving a BYE request must cease transmitting media streams specifically directed at the party issuing the BYE request.
  • control network elements like Call State Control Functions (CSCFs) or Media Gateway Control Functions (MGCFs) have complete control over the session related service execution, and may also have control over the usage of GPRS (General Packet Radio Service) bearer resources for IM (Internet Protocol Multimedia) Subsystem calls.
  • CSCFs Call State Control Functions
  • MGCFs Media Gateway Control Functions
  • this object is achieved by a method of closing a SIP active session in a communication network system, said method comprising the steps issuing a request indicating a drop of connection by a control network element towards an endpoint of the session, for initiating the closing of the active session, and issuing a BYE request by the endpoint towards the other endpoints of the session upon receiving the request indicating a drop of connection.
  • a communication network system comprising a control network element for issuing a request indicating a drop of connection towards an endpoint of a SIP active session, for initiating the closing of said active session, wherein the endpoint issues a BYE request towards the other endpoints of the session upon receiving the request indicating a drop of connection.
  • the BYE request issued by the endpoint will trigger the closing of the session along the call path.
  • the endpoint may also issue an acknowledge response towards the control network element upon receiving the request indicating a drop of connection.
  • the request indicating a drop of connection is issued as a response to said received information.
  • the control network element determines which endpoint is the cause of the closing of the session on the basis of the received information, and issues the request indicating a drop of connection towards an endpoint that is not the cause of the closing of the session.
  • control network element executes a service for an endpoint, resulting in an instruction to close the active session, and issues_.the request indicating a drop of connection as a response to the instruction towards another endpoint of the session.
  • the request indicating a drop of connection may comprise To, From and Call_ID headers which are identical to those of an original INVITE request for the session. Moreover, in the issued BYE request, the session to be closed may be identified by the To, From and Call_ID headers of the request indicating a drop of connection.
  • the request indicating a drop of connection and its response may travel on a path different from the path of an original INVITE request for the session.
  • control network element in a communication network system, the control network element being adapted to issue a request indicating a drop of connection towards an endpoint of a SIP active session, for initiating the closing of the active session by causing a BYE request to be issued by the endpoint towards the other endpoints of the session upon receiving the request indicating a drop of connection.
  • the control network element is adapted to receive an acknowledge response issued by the endpoint towards the control network element upon receiving the request indicating a drop of connection.
  • control network element is adapted to receive information indicating a need for closing the active session, and to issue the request indicating a drop of connection as a response to the received information.
  • the control network element is further adapted to determine which endpoint is the cause of the closing of the session on the basis of the received information, and to issue said request indicating a drop of connection towards an endpoint that is not the cause of the closing of the session.
  • the control network element may perform call control for the endpoint being the cause of the closing of the session.
  • control network element is adapted to execute a service for an endpoint resulting in an instruction to close the active session, and to issue the request indicating a drop of connection as a response to the instruction towards another endpoint of the session.
  • the above-mentioned object is achieved by a user equipment in a communication network system, wherein the user equipment is adapted to receive, in a SIP active session, a request indicating a drop of connection for initiating the closing of the active session, and to issue a BYE request towards other endpoints of the session upon receiving the request indicating a drop of connection.
  • the user equipment is further adapted to issue an acknowledge response towards a control network element upon receiving the request indicating a drop of connection from the control network element.
  • CSCFs and MGCFs are enabled to close SIP active sessions if required.
  • a need to interrupt a SIP connection may arise when a party involved in the SIP session is out-of-coverage, or as a result of a service execution, e.g. running out of prepaid credit.
  • Fig. 1 shows a signaling diagram according to an embodiment of the present invention, when a sudden loss of radio connection occurs.
  • Fig. 2 shows a signaling diagram according to another embodiment of the present invention, when an executed service results in an instruction to immediately close the session.
  • the idea of the present invention is to introduce a new SIP method to be used by a control entity like CSCF or MGCF in a communication network system to close active sessions.
  • the entity performing call/service control may initiate to close a SIP active session by issuing a request indicating a drop of connection (which is hereinafter called DROP request) towards one of the endpoints of the session.
  • DROP request a request indicating a drop of connection
  • the DROP request should be sent to the endpoint which was not the cause of the sudden closing of the session.
  • the To, From and Call_ID headers of the DROP request should be identical to those of the original INVITE request for the session.
  • the DROP request and its response may travel on a different path than that the original INVITE request of the session has taken.
  • the endpoint receiving the DROP request should acknowledge the request with a 200OK response, and immediately issue a BYE request towards the other endpoint (s) of the session.
  • This BYE request and, if possible, its response will trigger the closing of the session along the call path.
  • Fig. 1 shows a signaling diagram according to an embodiment of the present invention, when a User Equipment UE_A suddenly looses radio connection.
  • RRC Radio Network Controller
  • this event is communicated to a Proxy- CSCF_A performing call control for the UE_A (communications 2) in Fig. 1) .
  • the Proxy-CSCF_A initiates the closing of the IM Subsystem Session. Therefore, it issues a DROP request towards a User Equipment UE_B as participant of the session (communication 3) in Fig. 1).
  • the UE_B acknowledges the DROP request with a 200OK response (communication 4) in Fig.
  • the UE_B issues the BYE request to a Serving-CSCF_B performing service control for UE__B (communication 5) ) .
  • the Serving-CSCF_B forwards the BYE request to the Serving CSCF_A performing service control for UE_A (communication 6) )
  • the Serving-CSCF_A forwards the BYE request to the Proxy-CSCF_A (communication 7) ) .
  • the Proxy-CSCF_A forwards the BYE request to the UE_A (communication 8)), which, however, will not reach the UE_A since the UE_A has lost radio connection towards the
  • the BYE requests 5) to 8) in Fig. 1 trigger the closing of the session along the call path.
  • Fig. 2 shows a signaling diagram according to another embodiment of the present invention, when a service executed for a User Equipment UE_A results in an instruction to immediately close the session.
  • a service is executed for the UE_A in the active phase of a session comprising the participants UE_A and UE_B (block 1) in Fig. 2) by a Serving-CSCF_A performing service control for the UE_A.
  • This service results in the instruction to immediately close the session (block 2) in Fig. 2) because the UE_A is running out of pre-paid credit, for example. Therefore, the Serving-CSCF_A issues a DROP request towards the UE_B (communication 3) in Fig. 2) .
  • the UE_B acknowledges the DROP request with a 200OK response message (communication 4) in Fig. 2) , and issues a BYE request to the Serving-CSCF_B (communication 5) in Fig. 2) to close the session that corresponds to the session identified by the ⁇ From, To, Call_ID ⁇ triple in the DROP request.
  • the Serving-CSCF_B forwards the BYE request to the Serving-CSCF_A (communication 6) in Fig. 2), and the Serving-CSCF_A forwards the BYE request to the UE_A (communication 7) in Fig. 2).
  • the respective BYE requests are acknowledged by 200OK response messages.
  • the above described SIP method and in particular the DROP request can be implemented as an extension to the standard SIP stack in CSCFs and MGCFs .

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  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A method and a system for closing a SIP active session in a communication network system are disclosed, in which a request indicating a drop of connection is issued by a control network element towards an endpoint of the session, for initiating the closing of the active session, and a BYE request is issued by said endpoint towards the other endpoints of the session upon receiving said request indicating a drop of connection.

Description

TITLE OF THE INVENTION
CLOSING A SIP ACTIVE SESSION
FIELD OF THE INVENTION
The present invention relates to closing a SIP active session in a communication network system.
BACKGROUND OF THE INVENTION
The Session Initiation Protocol (SIP) is an application layer control (signaling) protocol that can establish, modify and terminate multimedia sessions or calls. These multimedia sessions include multimedia conferences, distance learning, Internet telephony and similar applications. SIP can invite both persons and "robots", such as a media storage device. SIP can invite parties to both unicast and multicast sessions. The initiator does not necessarily have to be a member of the session to which it is inviting. Media and participants can be added to an existing session.
In standard SIP, active sessions can only be closed by the endpoints of a session by issuing a BYE request. The BYE request is used by the endpoint to indicate to a server that it wishes to release the call. The BYE request is forwarded like an INVITE request and may be issued by either caller or callee. A party receiving a BYE request must cease transmitting media streams specifically directed at the party issuing the BYE request.
According to the 3GPP (3rd Generation Partnership Project) architecture, control network elements like Call State Control Functions (CSCFs) or Media Gateway Control Functions (MGCFs) have complete control over the session related service execution, and may also have control over the usage of GPRS (General Packet Radio Service) bearer resources for IM (Internet Protocol Multimedia) Subsystem calls.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to enable control network elements to close SIP active sessions.
According to an aspect of the present invention, this object is achieved by a method of closing a SIP active session in a communication network system, said method comprising the steps issuing a request indicating a drop of connection by a control network element towards an endpoint of the session, for initiating the closing of the active session, and issuing a BYE request by the endpoint towards the other endpoints of the session upon receiving the request indicating a drop of connection.
According to another aspect of the present invention, the object is achieved by a communication network system comprising a control network element for issuing a request indicating a drop of connection towards an endpoint of a SIP active session, for initiating the closing of said active session, wherein the endpoint issues a BYE request towards the other endpoints of the session upon receiving the request indicating a drop of connection.
The BYE request issued by the endpoint will trigger the closing of the session along the call path. The endpoint may also issue an acknowledge response towards the control network element upon receiving the request indicating a drop of connection.
According to an embodiment of the present invention, when receiving, by the control network element, information indicating a need for closing the active session, the request indicating a drop of connection is issued as a response to said received information. The control network element determines which endpoint is the cause of the closing of the session on the basis of the received information, and issues the request indicating a drop of connection towards an endpoint that is not the cause of the closing of the session.
According to another embodiment of the present invention, the control network element executes a service for an endpoint, resulting in an instruction to close the active session, and issues_.the request indicating a drop of connection as a response to the instruction towards another endpoint of the session.
The request indicating a drop of connection may comprise To, From and Call_ID headers which are identical to those of an original INVITE request for the session. Moreover, in the issued BYE request, the session to be closed may be identified by the To, From and Call_ID headers of the request indicating a drop of connection.
The request indicating a drop of connection and its response may travel on a path different from the path of an original INVITE request for the session.
Furthermore, the above-mentioned object is achieved by a control network element in a communication network system, the control network element being adapted to issue a request indicating a drop of connection towards an endpoint of a SIP active session, for initiating the closing of the active session by causing a BYE request to be issued by the endpoint towards the other endpoints of the session upon receiving the request indicating a drop of connection.
The control network element is adapted to receive an acknowledge response issued by the endpoint towards the control network element upon receiving the request indicating a drop of connection.
According to an embodiment of the present invention, the control network element is adapted to receive information indicating a need for closing the active session, and to issue the request indicating a drop of connection as a response to the received information. The control network element is further adapted to determine which endpoint is the cause of the closing of the session on the basis of the received information, and to issue said request indicating a drop of connection towards an endpoint that is not the cause of the closing of the session. The control network element may perform call control for the endpoint being the cause of the closing of the session.
According to another embodiment of the present invention, the control network element is adapted to execute a service for an endpoint resulting in an instruction to close the active session, and to issue the request indicating a drop of connection as a response to the instruction towards another endpoint of the session.
In addition, the above-mentioned object is achieved by a user equipment in a communication network system, wherein the user equipment is adapted to receive, in a SIP active session, a request indicating a drop of connection for initiating the closing of the active session, and to issue a BYE request towards other endpoints of the session upon receiving the request indicating a drop of connection.
The user equipment is further adapted to issue an acknowledge response towards a control network element upon receiving the request indicating a drop of connection from the control network element. According to the present invention, CSCFs and MGCFs are enabled to close SIP active sessions if required. A need to interrupt a SIP connection may arise when a party involved in the SIP session is out-of-coverage, or as a result of a service execution, e.g. running out of prepaid credit.
In the following the present invention will be described by way of preferred embodiments thereof with reference to the accompanying drawings .
BRIEF- DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a signaling diagram according to an embodiment of the present invention, when a sudden loss of radio connection occurs.
Fig. 2 shows a signaling diagram according to another embodiment of the present invention, when an executed service results in an instruction to immediately close the session.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The idea of the present invention is to introduce a new SIP method to be used by a control entity like CSCF or MGCF in a communication network system to close active sessions.
The entity performing call/service control, e.g. CSCF or MGCF, may initiate to close a SIP active session by issuing a request indicating a drop of connection (which is hereinafter called DROP request) towards one of the endpoints of the session. Preferably, the DROP request should be sent to the endpoint which was not the cause of the sudden closing of the session. The To, From and Call_ID headers of the DROP request should be identical to those of the original INVITE request for the session. The DROP request and its response may travel on a different path than that the original INVITE request of the session has taken. The endpoint receiving the DROP request should acknowledge the request with a 200OK response, and immediately issue a BYE request towards the other endpoint (s) of the session. This BYE request and, if possible, its response will trigger the closing of the session along the call path.
Fig. 1 shows a signaling diagram according to an embodiment of the present invention, when a User Equipment UE_A suddenly looses radio connection. When the Radio Access Bearer (RAB) release timer in the Radio Network Controller (RNC) expires (block 1) in Fig. 1), this event is communicated to a Proxy- CSCF_A performing call control for the UE_A (communications 2) in Fig. 1) . As a result, the Proxy-CSCF_A initiates the closing of the IM Subsystem Session. Therefore, it issues a DROP request towards a User Equipment UE_B as participant of the session (communication 3) in Fig. 1). The UE_B acknowledges the DROP request with a 200OK response (communication 4) in Fig. 1), and issues a BYE request to close the session that corresponds to the session identified by the {From, To Call_ID} triple in the DROP request. As it shown in Fig. 1, the UE_B issues the BYE request to a Serving-CSCF_B performing service control for UE__B (communication 5) ) . The Serving-CSCF_B forwards the BYE request to the Serving CSCF_A performing service control for UE_A (communication 6) ) , and the Serving-CSCF_A forwards the BYE request to the Proxy-CSCF_A (communication 7) ) . Finally, the Proxy-CSCF_A forwards the BYE request to the UE_A (communication 8)), which, however, will not reach the UE_A since the UE_A has lost radio connection towards the
Universal Terrestrial Radio Access Network (UTRAN) . The BYE requests 5) to 8) in Fig. 1 trigger the closing of the session along the call path.
Fig. 2 shows a signaling diagram according to another embodiment of the present invention, when a service executed for a User Equipment UE_A results in an instruction to immediately close the session. In this embodiment, a service is executed for the UE_A in the active phase of a session comprising the participants UE_A and UE_B (block 1) in Fig. 2) by a Serving-CSCF_A performing service control for the UE_A. This service results in the instruction to immediately close the session (block 2) in Fig. 2) because the UE_A is running out of pre-paid credit, for example. Therefore, the Serving-CSCF_A issues a DROP request towards the UE_B (communication 3) in Fig. 2) . The UE_B acknowledges the DROP request with a 200OK response message (communication 4) in Fig. 2) , and issues a BYE request to the Serving-CSCF_B (communication 5) in Fig. 2) to close the session that corresponds to the session identified by the {From, To, Call_ID} triple in the DROP request. The Serving-CSCF_B forwards the BYE request to the Serving-CSCF_A (communication 6) in Fig. 2), and the Serving-CSCF_A forwards the BYE request to the UE_A (communication 7) in Fig. 2). In the following communications 8) to 10) in Fig. 2, the respective BYE requests are acknowledged by 200OK response messages.
The above described SIP method and in particular the DROP request can be implemented as an extension to the standard SIP stack in CSCFs and MGCFs .
While the invention has been described with reference to preferred embodiments, the description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications and applications may occur to those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims .

Claims

CLAIMS :
1. A method of closing a SIP active session in a communication network system, said method comprising the steps of: issuing a request indicating a drop of connection by a control network element towards an endpoint of the session, for initiating the closing of the active session; and issuing a BYE request by said endpoint towards the other endpoints of the session upon receiving said request indicating a drop of connection.
2. A method according to claim 1, wherein said BYE request triggers the closing of the session along the call path.
3. A method according to claim 1 or 2, comprising the further step of: issuing an acknowledge response by said endpoint towards said control network element upon receiving said request indicating a drop of connection.
4. A method according to any one of claims 1 to 3, comprising the further step of: receiving, by said control network element, information indicating a need for closing the active session, wherein said request indicating a drop of connection is issued as a response to said received information.
5. A method according to claim 4, comprising the further step of: determining which endpoint is the cause of the closing of the session on the basis of the received information, wherein said request indicating a drop of connection is issued towards an endpoint that is not the cause of the closing of the session.
6. A method according to any one of claims 1 to 3, comprising the further step of: executing a service for an endpoint by said control network element, resulting in an instruction to close the active session, wherein said request indicating a drop of connection is issued as a response to said instruction towards another endpoint of the session.
7. A method according to any one of the preceding claims, wherein said request indicating a drop of connection comprises To, From and Call_ID headers which are identical to those of an original INVITE request for the session.
8. A method according to claim 7, wherein in the issued BYE request the session to be closed is identified by the To, From and Call_ID headers of the request indicating a drop of connection.
9. A method according to claim 3, wherein said request indicating a drop of connection and its response travel on a path different from the path of an original INVITE request for the session.
10. A communication network system comprising: a control network element for issuing a request indicating a drop of connection towards an endpoint of a SIP active session, for initiating the closing of said active session, wherein said endpoint issues a BYE request towards the other endpoints of the session upon receiving said request indicating a drop of connection.
11. A system according to claim 10, wherein said BYE request triggers the closing of the session along the call path.
12. A system according to claim 10 or 11, wherein said endpoint issues an acknowledge response towards said control network element upon receiving said request indicating a drop of connection.
13. A system according to any one of claims 10 to 12, wherein, when said control network element receives information indicating a need for closing the active session, said control network element issues said request indicating a drop of connection as a response to said received information.
14. A system according to claim 13, wherein said control network element determines which endpoint is the cause of the closing of the session on the basis of the received information, and issues said request indicating a drop of connection towards an endpoint that is not the cause of the closing of the session.
15. A system according to any one of claims 10 to 12, wherein, when said control network element executes a service for an endpoint resulting in an instruction to close the active session, said control network element" issues said request indicating a drop of connection as a response to said instruction towards another endpoint of the session.
16. A system according to any one of claims 10 to 15, wherein said request indicating a drop of connection comprises To, From and Call_ID headers which are identical to those of an original INVITE request for the session.
17. A system according to claim 16, wherein in the issued BYE request the session to be closed is identified by the To, From and Call_ID headers of the request indicating a drop of connection.
18. A system according to claim 12, wherein said request indicating a drop of connection and its response travel on a path different from the path of an original INVITE request for the session.
19. A control network element in a communication network system, wherein said control network element is adapted to issue a request indicating a drop of connection towards an endpoint of a SIP active session, for initiating the closing of said active session by causing a BYE request to be issued by said endpoint towards the other endpoints of the session upon receiving said request indicating a drop of connection.
20. A control network element according to claim 19, wherein said BYE request triggers the closing of the session along the call path.
21. A control network element according to claim 19 or 20, wherein said control network element is adapted to receive an acknowledge response issued by said endpoint towards said control network element upon receiving said request indicating a drop of connection.
22. A control network element according to any one of claims 19 to 21, wherein said control network element is adapted to receive information indicating a need for closing the active session, and to issue said request indicating a drop of connection as a response to said received information.
23. A control network element according to claim 22, wherein said control network element is adapted to determine which endpoint is the cause of the closing of the session on the basis of the received information, and to issue said request indicating a drop of connection towards an endpoint that is not the cause of the closing of the session.
24. A control network element according to claim 23, wherein said control network element performs call control for the endpoint being the cause of the closing of the session.
25. A control network element according to any one of claims 19 to 21, wherein said control network element is adapted to execute a service for an endpoint resulting in an instruction to close the active session, and to issue said request indicating a drop of connection as a response to said instruction towards another endpoint of the session.
26. A control network element according to any one of claims 19 to 25, wherein said request indicating a drop of connection comprises To, From and Call__ID headers which are identical to those of an original INVITE request for the session.
27. A user equipment in a communication network system, wherein said user equipment is adapted to receive, in a SIP active session, a request indicating a drop of connection for initiating the closing of said active session, and to issue a BYE request towards other endpoints of the session upon receiving said request indicating a drop of connection.
28. A user equipment according to claim 27, wherein said BYE request triggers the closing of the session along the call path.
29. A user equipment according to claim 27 or 28, wherein said user equipment is adapted to issue an acknowledge response towards a control network element upon receiving said request indicating a drop of connection from said control network element.
30. A user equipment according to any one of claims 27 to 29, wherein said request indicating a drop of connection comprises To, From and Call_ID headers which are identical to those of an original INVITE request for the session.
31. A user equipment according to claim 30, wherein in the issued BYE request the session to be closed is identified by the To, From and Call__ID headers of the request indicating a drop of connection.
PCT/EP2001/001849 2001-02-19 2001-02-19 Closing a sip active session WO2002067533A1 (en)

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