WO2004034655A1 - A method of establishing and deleting mbms service in sgsn and ggsn - Google Patents

A method of establishing and deleting mbms service in sgsn and ggsn Download PDF

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Publication number
WO2004034655A1
WO2004034655A1 PCT/KR2003/002095 KR0302095W WO2004034655A1 WO 2004034655 A1 WO2004034655 A1 WO 2004034655A1 KR 0302095 W KR0302095 W KR 0302095W WO 2004034655 A1 WO2004034655 A1 WO 2004034655A1
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WO
WIPO (PCT)
Prior art keywords
mbms
ggsn
sgsn
message
mbms service
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PCT/KR2003/002095
Other languages
French (fr)
Inventor
Sung-Ho Choi
Kook-Heui Lee
Chang Duan
Detao Li
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Samsung Electronics Co., Ltd.
Bejing Samsung Telecom R & D Center
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Application filed by Samsung Electronics Co., Ltd., Bejing Samsung Telecom R & D Center filed Critical Samsung Electronics Co., Ltd.
Publication of WO2004034655A1 publication Critical patent/WO2004034655A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • This invention relates to a method of establishing and deleting MBMS (Multimedia Broadcast/Multicast Service) multicast service in a network equipment (SGSN and GGSN) of a WCDMA communication system.
  • MBMS Multimedia Broadcast/Multicast Service
  • MBMS (hereinafter referred to as MBMS) is a new service under standardization by 3rd Generation Partnership Project (hereinafter referred to as 3GPP).
  • 3GPP 3rd Generation Partnership Project
  • MBMS service is a unidirectional point-to-multipoint (p-t-m) service, whose most remarkable characteristic is that it can make use of radio resources and network resources efficiently.
  • Figure 1 illustrates a system structure of MBMS
  • Figure 2 is an example for illustrating a flow of MBMS multicast service set-up
  • Figure 3 illustrates a flow of MBMS multicast service deletion.
  • MBMS network structure is based on the core network of General Packet Radio Service (hereinafter referred to as GPRS), and adds new network units.
  • Broadcast and multicast service center 101 (hereinafter referred to as BM-SC) is a service control center of MBMS system.
  • Gateway GPRS Supporting Node 102 (hereinafter referred to as GGSN) and Service GPRS Supporting Node 103 (hereinafter referred to as SGSN) compose a transmission network of MBMS service and provide route for data transfer.
  • UMTS Terrestrial Radio Access Network 104 (hereinafter referred to as UTRAN) provides radio resources for MBMS service over an air-interface.
  • UE User Equipment 105
  • HLR Home Location Register
  • Gn/Gp 107 represents an interface between SGSN and GGSN.
  • Gi 108 represents an interface between BM-SC and GGSN, and the interface protocol is Internet Group Management Protocol (hereinafter referred to as IGMP).
  • Gmb 109 represents an interface between BM-SC and GGSN, and the interface protocol is dedicated to transfer MBMS signalling parameters.
  • the radio resources used by MBMS service are not dedicated for one user, but are shared by all users of this service. The flow shown in Figure 2 will be explained in the following:
  • UE When UE wants to receive a certain MBMS service, it sends an message to establish MBMS Request to SGSN, which includes the parameters that can uniquely indicate that MBMS service, e.g. IP multicast address, access point name (hereinafter referred to as APN, which is used to seek for GGSN), etc.
  • APN access point name
  • 202 SGSN performs necessary security check on the UE to ensure whether the UE is registered.
  • SGSN If the UE is the first one that requests for the MBMS service, SGSN will send an Establish MBMS Context Request to GGSN, which includes parameters related to the MBMS service. If the UE is not the first one to request for the MBMS service, SGSN executes step 206 directly.
  • GGSN After GGSN receives the Establish MBMS Context Request, GGSN sends a Join MBMS Service Group Request to BM-SC via Gi interface if the MBMS service indicated by the context has never been established in GGSN. 205 GGSN sends an Establish MBMS Context Response to SGSN while establishing an
  • SGSN After SGSN receives a response from GGSN, it establishes the MBMS Context.
  • UE When UE wants to deactivate a certain MBMS service, UE sends a Deactivate MBMS Service Request to SGSN.
  • SGSN After receiving the request, SGSN checks whether the UE is the last one that is using the MBMS service. If so, SGSN sends a Delete MBMS Context Request to GGSN; otherwise, SGSN executes step 304 directly.
  • GGSN After receiving the request, GGSN deletes the MBMS Context and sends a Delete MBMS Context Response to SGSN.
  • SGSN After receiving the response from GGSN, SGSN deletes the MBMS Context and sends a message to deactivate MBMS Service Response to the UE. •
  • MBMS is a new technology under research
  • existing Establish MBMS Service methods can not solve the problem of controlling MBMS service and UE of this service on the interface between SGSN and GGSN simultaneously, and can not meet the requirement of initializing the establishment of a service by RNC, which make some service requirements for MBMS can not been met.
  • the method of establishing MBMS service for UE by existing network equipments is neither perfect nor complete, and does not provide the method of initializing the establishment of a service by RNC, which make the signaling established on the Gn/Gp interface unable to well control MBMS service and the UE of this service, and make RNC unable to initialize establishment of a service actively.
  • An object of this invention is to provide a new method for establishing MBMS service such that MBMS service and UE of this service can be controlled simultaneously between SGSN and GGSN and RNC is enabled to initialize establishment of a service actively.
  • a method of establishing MBMS service between SGSN and GGSN comprises the steps of: (1) receiving, in the SGSN, an MBMS Service Request message from UE or RNC;
  • a method of establishing MBMS service between SGSN and GGSN comprises the steps of: ( 1 ) GGSN receives an Establish First MBMS Context Request message from SGSN and saves the message;
  • GGSN constructs a Join MBMS Service Group Request message according to the message received in step (1) and sends the message to BM-SC; (3) GGSN receives a Join MBMS Service Group Response message from BM-SC and saves the message;
  • GGSN establishes a First MBMS Context according to the messages received in step ( 1 ) and step (3);
  • GGSN constructs an Establish First MBMS Context Response message according to the messages received in step (1) and step (3) and sends the message to SGSN;
  • GGSN receives an Establish Second MBMS Context Request message from SGSN and saves the message;
  • GGSN establishes a Second MBMS Context according to the messages received in step (6) and said First MBMS Context having been established, and associates the Second MBMS Context with the First MBMS Context established in step (4) by one connection flag;
  • GGSN constructs an Establish Second MBMS Context Response message according to said Second MBMS Context established in step (7), the message containing relevant parameters of the MBMS service, GGSN access address and other parameters of GGSN-
  • a method of deleting MBMS service in SGSN comprises the steps of:
  • SGSN receives a Deactivate MBMS Service Request message from UE or RNC and saves the message; (2) if the message in step (1) comes from the UE, SGSN constructs a Delete Second
  • MBMS Context Request message according to the message received in step (1) and executes step (3), otherwise SGSN executes step (4) directly;
  • SGSN receives a Delete First MBMS Context Response message from GGSN and deletes a First MBMS Context.
  • a method of deleting MBMS service in GGSN comprises the steps of:
  • ( 1 ) GGSN receives a Delete Second MBMS Context Request message from SGSN;
  • GGSN constructs a Delete Second MBMS Context Response message according to the message received in step (1) and sends the message to SGSN, and deletes a Second
  • GGSN constructs a Delete First MBMS Context Response message according to the message received in step (3) and sends the message to SGSN, and deletes a First MBMS Context.
  • the present invention enhances the ability of controlling MBMS service between SGSN and GGSN and optimizes the data bearer between SGSN and GGSN, such that GGSN is able to charge on a single UE, and BM-SC is able to authenticate a single UE;
  • Figure 1 illustrates a system structure of realizing MBMS service as well as a logic network equipment node.
  • Figure 2 illustrates a method of establishing MBMS service in prior art
  • Figure 3 illustrates a method of deleting MBMS service in prior art.
  • Figure 4 illustrates an embodiment of initializing establishment of MBMS service by UE according to the present invention.
  • Figure 5 illustrates an embodiment of initializing deletion of MBMS service by UE according to the present invention.
  • Figure 6 illustrates an embodiment of initializing establishment of MBMS service by RNC according to the present invention.
  • Figure 7 illustrates an embodiment of initializing deletion of MBMS service by RNC according to the present invention.
  • the UE When a UE wants to use a certain MBMS service, the UE sends an Establish MBMS Service Request to SGSN, which includes relevant parameters of the MBMS service, such as IP address, APN (access point name, which is used to seek for GGSN), etc.
  • SGSN which includes relevant parameters of the MBMS service, such as IP address, APN (access point name, which is used to seek for GGSN), etc.
  • 402 SGSN performs security check on the UE to identify the UE was registered.
  • SGSN checks whether the UE is the first one that applies for the MBMS service. If so, SGSN sends an Establish First MBMS Context Request to GGSN and waits for response, the request containing necessary parameters for identifying the MBMS service; otherwise, SGSN starts to execute from step 408.
  • GGSN After receiving the request from SGSN, GGSN sends a Join MBMS Service Group Request to BM-SC via Gmb interface and waits for response. 405 GGSN receives a Join MBMS Service Group Response from BM-SC and establishes a First MBMS Context.
  • 406 GGSN sends a Join MBMS Service Group message to BM-SC to BM-SC via Gi interface.
  • SGSN After receiving an Establish First MBMS Context Response from GGSN, SGSN establishes the First MBMS Context.
  • 409 GGSN sends a UE Joining MBMS Service Group Notification to BM-SC.
  • 410 BM-SC sends a UE Joining MBMS Service Group Response to GGSN.
  • 41 1 GGSN sends an Establish Second MBMS Context Response to SGSN and establishes a Second MBMS Context.
  • SGSN After receiving the response message from GGSN, SGSN establishes the Second MBMS Context, and establishes radio access bearer through interactions with RAN and
  • 502 SGSN sends a Delete Second MBMS Context Request message to GGSN.
  • 503 GGSN sends a UE Leaving MBMS Service Group Notification to BM-SC via Gi interface.
  • GGSN sends a Delete Second MBMS Context Response message to SGSN and deletes a Second MBMS Context.
  • SGSN deletes the Second MBMS Context and sends a Deactivate MBMS Service Response message to the UE.
  • SGSN If after checking SGSN finds that no other UEs or RNCs use this MBMS service, then SGSN sends a Delete First MBMS Context Request message to GGSN.
  • GGSN After GGSN receives the request message from SGSN, if the SGSN is the last one that uses the MBMS service in GGSN, then GGSN sends a Leave MBMS Service Group message to BM-SC via Gi interface and deletes a First MBMS Context.
  • SGSN After receiving a Delete First MBMS Context Response message from GGSN, SGSN deletes the First MBMS Context.
  • a UE When a UE wants to use a certain MBMS service, the UE sends an message to establish MBMS Service to SGSN, which have relevant parameters of the MBMS service, such as IP address, APN (access point name, which is used to seek for GGSN), etc.
  • SGSN which have relevant parameters of the MBMS service, such as IP address, APN (access point name, which is used to seek for GGSN), etc.
  • SGSN checks whether this MBMS has been established, if not, SGSN then sends an Establish First MBMS Context Request to GGSN and waits for response, the request containing necessary parameters for identifying the MBMS service; otherwise, SGSN executes step 607 directly.
  • GGSN After receiving the request from SGSN, GGSN sends a Join MBMS Service Group Request to BM-SC via Gmb interface and waits for response.
  • 604 GGSN receives a Join MBMS Service Group Response from BM-SC and establishes a First MBMS Context.
  • 605 GGSN sends a Join MBMS Service Group message to BM-SC to BM-SC via Gi interface.
  • 606 After receiving an Establish First MBMS Context Response from GGSN, SGSN establishes the First MBMS Context.
  • 607 SGSN sends an Establish MBMS Service Response to the RNC.
  • MBMS service is successfully established.
  • RNC When RNC wants to deactivate the reception of a certain MBMS service, it sends a Deactivate MBMS Service Request to SGSN, which contains the identity parameters of the MBMS Service to be deactivated, such as IP multicast address and APN, etc.
  • SGSN If after checking SGSN finds that no other UEs or RNCs use this MBMS service, then SGSN sends a Delete First MBMS Context Request message to GGSN.
  • GGSN After GGSN receives the request message from SGSN, if the SGSN is the last one that uses the MBMS service in GGSN, then GGSN sends a Leave MBMS Service Group message to BM-SC via Gi interface and deletes a First MBMS Context.
  • SGSN After receiving a Delete First MBMS Context Response message from GGSN, SGSN deletes the First MBMS Context.

Abstract

A method of establishing MBMS service in SGSN and GGSN comprises the steps of: SGSN receives an Establish MBMS Service Request message from UE and saves the message; SGSN constructs an Establish First MBMS Context Request message according to the message received in step (1) and sends the message to GGSN; SGSN receives an Establish First MBMS Context Response message from GGSN and saves the message; SGSN establishes a First MBMS Context according to step (1) and step (3); SGSN constructs an Establish Second MBMS Context Request message according to the message received in step (1) and said First MBMS Context having been established, and sends the message to GGSN; SGSN receives an Establish Second MBMS Context Response message from GGSN and saves the message; SGSN establishes a Second MBMS Context according to step (1) and step (6), and associates the Second MBMS with the First MBMS Context established in step (4).

Description

A METHOD OF ESTABLISHING AND DELETING MBMS SERVICE IN SGSN
AND GGSN
BACKGROUND OF THE INVENTION
1. FIELD OF INVENTION
This invention relates to a method of establishing and deleting MBMS (Multimedia Broadcast/Multicast Service) multicast service in a network equipment (SGSN and GGSN) of a WCDMA communication system.
2. DESCRIPTION OF PRIOR ART
MBMS (hereinafter referred to as MBMS) is a new service under standardization by 3rd Generation Partnership Project (hereinafter referred to as 3GPP). MBMS service is a unidirectional point-to-multipoint (p-t-m) service, whose most remarkable characteristic is that it can make use of radio resources and network resources efficiently.
To better descript MBMS, Figure 1 illustrates a system structure of MBMS; Figure 2 is an example for illustrating a flow of MBMS multicast service set-up; and Figure 3 illustrates a flow of MBMS multicast service deletion.
As shown in Fig. 1 , MBMS network structure is based on the core network of General Packet Radio Service (hereinafter referred to as GPRS), and adds new network units. Broadcast and multicast service center 101 (hereinafter referred to as BM-SC) is a service control center of MBMS system. Gateway GPRS Supporting Node 102 (hereinafter referred to as GGSN) and Service GPRS Supporting Node 103 (hereinafter referred to as SGSN) compose a transmission network of MBMS service and provide route for data transfer. UMTS Terrestrial Radio Access Network 104 (hereinafter referred to as UTRAN) provides radio resources for MBMS service over an air-interface. User Equipment 105 (hereinafter referred to as UE) is a terminal device used to receive data. Home Location Register 106 (hereinafter referred to as HLR) saves the data related to user and can provide services such as user's authentication. Gn/Gp 107 represents an interface between SGSN and GGSN. Gi 108 represents an interface between BM-SC and GGSN, and the interface protocol is Internet Group Management Protocol (hereinafter referred to as IGMP). Gmb 109 represents an interface between BM-SC and GGSN, and the interface protocol is dedicated to transfer MBMS signalling parameters. The radio resources used by MBMS service are not dedicated for one user, but are shared by all users of this service. The flow shown in Figure 2 will be explained in the following:
201 When UE wants to receive a certain MBMS service, it sends an message to establish MBMS Request to SGSN, which includes the parameters that can uniquely indicate that MBMS service, e.g. IP multicast address, access point name (hereinafter referred to as APN, which is used to seek for GGSN), etc.
202 SGSN performs necessary security check on the UE to ensure whether the UE is registered.
203 If the UE is the first one that requests for the MBMS service, SGSN will send an Establish MBMS Context Request to GGSN, which includes parameters related to the MBMS service. If the UE is not the first one to request for the MBMS service, SGSN executes step 206 directly.
204 After GGSN receives the Establish MBMS Context Request, GGSN sends a Join MBMS Service Group Request to BM-SC via Gi interface if the MBMS service indicated by the context has never been established in GGSN. 205 GGSN sends an Establish MBMS Context Response to SGSN while establishing an
MBMS Context.
206 After SGSN receives a response from GGSN, it establishes the MBMS Context.
207 SGSN sends an Establish MBMS Service Response to the UE.
The flow shown in Figure 3 will be explained in the following:
301 When UE wants to deactivate a certain MBMS service, UE sends a Deactivate MBMS Service Request to SGSN.
302 After receiving the request, SGSN checks whether the UE is the last one that is using the MBMS service. If so, SGSN sends a Delete MBMS Context Request to GGSN; otherwise, SGSN executes step 304 directly.
303 After receiving the request, GGSN deletes the MBMS Context and sends a Delete MBMS Context Response to SGSN.
304 After receiving the response from GGSN, SGSN deletes the MBMS Context and sends a message to deactivate MBMS Service Response to the UE. •
As MBMS is a new technology under research, in existing MBMS technologies, existing Establish MBMS Service methods can not solve the problem of controlling MBMS service and UE of this service on the interface between SGSN and GGSN simultaneously, and can not meet the requirement of initializing the establishment of a service by RNC, which make some service requirements for MBMS can not been met.
The method of establishing MBMS service for UE by existing network equipments (SGSN and GGSN) is neither perfect nor complete, and does not provide the method of initializing the establishment of a service by RNC, which make the signaling established on the Gn/Gp interface unable to well control MBMS service and the UE of this service, and make RNC unable to initialize establishment of a service actively.
SUMMARY OF THE INVENTION
An object of this invention is to provide a new method for establishing MBMS service such that MBMS service and UE of this service can be controlled simultaneously between SGSN and GGSN and RNC is enabled to initialize establishment of a service actively.
To achieve above object, according to one aspect of this invention, a method of establishing MBMS service between SGSN and GGSN comprises the steps of: (1) receiving, in the SGSN, an MBMS Service Request message from UE or RNC;
(2) constructing an First MBMS Context Request message according to the MBMS Service Request message and sends the MBMS Context Request message to GGSN when the MBMS Service Request message is the first message to request a specific MBMS service; (3) receiving an response message of the MBMS Context Request message from
GGSN;
(4) establishing a First MBMS Context according to the MBMS Service Request message and the Context Request message received in step (1) and step (3);
(5) constructing an Second MBMS Context Request message according to another MBMS Service Request message and said First MBMS Context having been established, and sends the Second MBMS Context Request message to GGSN;
(6) receiving a message response for the Second MBMS Context Request message from GGSN;
(7) establishing a Second MBMS Context according to the messages and associates the Second MBMS context with the First MBMS Context established in step (4) by one connection flag.
According to another aspect of the invention, a method of establishing MBMS service between SGSN and GGSN comprises the steps of: ( 1 ) GGSN receives an Establish First MBMS Context Request message from SGSN and saves the message;
(2) GGSN constructs a Join MBMS Service Group Request message according to the message received in step (1) and sends the message to BM-SC; (3) GGSN receives a Join MBMS Service Group Response message from BM-SC and saves the message;
(4) GGSN establishes a First MBMS Context according to the messages received in step ( 1 ) and step (3);
(5) GGSN constructs an Establish First MBMS Context Response message according to the messages received in step (1) and step (3) and sends the message to SGSN;
(6) GGSN receives an Establish Second MBMS Context Request message from SGSN and saves the message;
(7) GGSN establishes a Second MBMS Context according to the messages received in step (6) and said First MBMS Context having been established, and associates the Second MBMS Context with the First MBMS Context established in step (4) by one connection flag;
(8) GGSN constructs an Establish Second MBMS Context Response message according to said Second MBMS Context established in step (7), the message containing relevant parameters of the MBMS service, GGSN access address and other parameters of GGSN-
According to still another aspect of the invention, a method of deleting MBMS service in SGSN comprises the steps of:
( 1 ) SGSN receives a Deactivate MBMS Service Request message from UE or RNC and saves the message; (2) if the message in step (1) comes from the UE, SGSN constructs a Delete Second
MBMS Context Request message according to the message received in step (1) and executes step (3), otherwise SGSN executes step (4) directly;
(3) SGSN receives a Delete Second MBMS Context Response message from GGSN and deletes a Second MBMS Context; (4) SGSN constructs a Delete First MBMS Context Request message and sends the message to GGSN;
(5) SGSN receives a Delete First MBMS Context Response message from GGSN and deletes a First MBMS Context. According to another aspect of the invention, a method of deleting MBMS service in GGSN comprises the steps of:
( 1 ) GGSN receives a Delete Second MBMS Context Request message from SGSN;
(2) GGSN constructs a Delete Second MBMS Context Response message according to the message received in step (1) and sends the message to SGSN, and deletes a Second
MBMS Context;
(3) GGSN receives a Delete First MBMS Context Request message from SGSN;
(4) GGSN constructs a Delete First MBMS Context Response message according to the message received in step (3) and sends the message to SGSN, and deletes a First MBMS Context.
The present invention enhances the ability of controlling MBMS service between SGSN and GGSN and optimizes the data bearer between SGSN and GGSN, such that GGSN is able to charge on a single UE, and BM-SC is able to authenticate a single UE;
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates a system structure of realizing MBMS service as well as a logic network equipment node. Figure 2 illustrates a method of establishing MBMS service in prior art;
Figure 3 illustrates a method of deleting MBMS service in prior art.
Figure 4 illustrates an embodiment of initializing establishment of MBMS service by UE according to the present invention.
Figure 5 illustrates an embodiment of initializing deletion of MBMS service by UE according to the present invention.
Figure 6 illustrates an embodiment of initializing establishment of MBMS service by RNC according to the present invention.
Figure 7 illustrates an embodiment of initializing deletion of MBMS service by RNC according to the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The process of initializing the establishment of MBMS service by UE in network equipments is shown in Figure 4, the descriptions for which will be given in the following:
401 When a UE wants to use a certain MBMS service, the UE sends an Establish MBMS Service Request to SGSN, which includes relevant parameters of the MBMS service, such as IP address, APN (access point name, which is used to seek for GGSN), etc.
402 SGSN performs security check on the UE to identify the UE was registered.
403 SGSN checks whether the UE is the first one that applies for the MBMS service. If so, SGSN sends an Establish First MBMS Context Request to GGSN and waits for response, the request containing necessary parameters for identifying the MBMS service; otherwise, SGSN starts to execute from step 408.
404 After receiving the request from SGSN, GGSN sends a Join MBMS Service Group Request to BM-SC via Gmb interface and waits for response. 405 GGSN receives a Join MBMS Service Group Response from BM-SC and establishes a First MBMS Context.
406 GGSN sends a Join MBMS Service Group message to BM-SC to BM-SC via Gi interface.
407 After receiving an Establish First MBMS Context Response from GGSN, SGSN establishes the First MBMS Context.
408 SGSN sends an Establish Second MBMS Context Request to GGSN.
409 GGSN sends a UE Joining MBMS Service Group Notification to BM-SC.
410 BM-SC sends a UE Joining MBMS Service Group Response to GGSN.
41 1 GGSN sends an Establish Second MBMS Context Response to SGSN and establishes a Second MBMS Context.
412 After receiving the response message from GGSN, SGSN establishes the Second MBMS Context, and establishes radio access bearer through interactions with RAN and
UE.
413 SGSN sends an Establish MBMS Service Response to the UE. Thus, MBMS service is successfully established.
The process of initializing the deletion of MBMS service by UE in network equipments is shown in Figure 5, the descriptions for which will be given in the following: 501 When UE wants to deactivate the reception of a certain MBMS service, it sends a Deactivate MBMS Service Request to SGSN, which contains the identity parameters of the MBMS Service to be deactivated, such as IP multicast address and APN, etc.
502 SGSN sends a Delete Second MBMS Context Request message to GGSN. 503 GGSN sends a UE Leaving MBMS Service Group Notification to BM-SC via Gi interface.
504 GGSN sends a Delete Second MBMS Context Response message to SGSN and deletes a Second MBMS Context.
505 SGSN deletes the Second MBMS Context and sends a Deactivate MBMS Service Response message to the UE.
506 SGSN releases RAB together with RAN and the UE.
507 If after checking SGSN finds that no other UEs or RNCs use this MBMS service, then SGSN sends a Delete First MBMS Context Request message to GGSN.
508 After GGSN receives the request message from SGSN, if the SGSN is the last one that uses the MBMS service in GGSN, then GGSN sends a Leave MBMS Service Group message to BM-SC via Gi interface and deletes a First MBMS Context.
509 After receiving a Delete First MBMS Context Response message from GGSN, SGSN deletes the First MBMS Context.
The process of initializing the establishment of MBMS service by RNC in network equipments is shown in Figure 6, the descriptions for which will be given in the following:
601 When a UE wants to use a certain MBMS service, the UE sends an message to establish MBMS Service to SGSN, which have relevant parameters of the MBMS service, such as IP address, APN (access point name, which is used to seek for GGSN), etc.
602 SGSN checks whether this MBMS has been established, if not, SGSN then sends an Establish First MBMS Context Request to GGSN and waits for response, the request containing necessary parameters for identifying the MBMS service; otherwise, SGSN executes step 607 directly.
603 After receiving the request from SGSN, GGSN sends a Join MBMS Service Group Request to BM-SC via Gmb interface and waits for response.
604 GGSN receives a Join MBMS Service Group Response from BM-SC and establishes a First MBMS Context. 605 GGSN sends a Join MBMS Service Group message to BM-SC to BM-SC via Gi interface. 606 After receiving an Establish First MBMS Context Response from GGSN, SGSN establishes the First MBMS Context.
607 SGSN sends an Establish MBMS Service Response to the RNC. MBMS service is successfully established.
The process of initializing the deletion of MBMS service by RNC in network equipments is shown in Figure 7, the descriptions for which will be given in the following:
701 When RNC wants to deactivate the reception of a certain MBMS service, it sends a Deactivate MBMS Service Request to SGSN, which contains the identity parameters of the MBMS Service to be deactivated, such as IP multicast address and APN, etc.
702 If after checking SGSN finds that no other UEs or RNCs use this MBMS service, then SGSN sends a Delete First MBMS Context Request message to GGSN.
703 After GGSN receives the request message from SGSN, if the SGSN is the last one that uses the MBMS service in GGSN, then GGSN sends a Leave MBMS Service Group message to BM-SC via Gi interface and deletes a First MBMS Context.
704 After receiving a Delete First MBMS Context Response message from GGSN, SGSN deletes the First MBMS Context.
705 SGSN sends Deactivate MBMS Service Response message to RNC.

Claims

WHAT IS CLAIMS
1 . A method of establishing MBMS service in SGSN and GGSN comprises the steps of:
(1 ) receiving, in the SGSN, an MBMS Service Request message from UE or RNC; (2) constructing an First MBMS Context Request message according to the MBMS
Service Request message and sends the MBMS Context Request message to GGSN when the MBMS Service Request message is the first message to request a specific MBMS service;
(3) receiving an response message of the MBMS Context Request message from GGSN;
(4) establishing a First MBMS Context according to the MBMS Service Request message and the Context Request message received in step (1) and step (3);
(5) constructing an Second MBMS Context Request message according to another MBMS Service Request message and said First MBMS Context having been established, and sends the Second MBMS Context Request message to GGSN;
(6) receiving a message response for the Second MBMS Context Request message from GGSN;
(7) establishing a Second MBMS Context according to the messages and associates the Second MBMS context with the First MBMS Context established in step (4) by one connection flag.
2. The method according to Claim 1, wherein in step (1), if SGSN finds that the MBMS service requested by UE for establishment has existed, SGSN executes steps (5) to (7) directly; and if SGSN finds that the Establish MBMS Service Request message comes from RNC, SGSN need not execute steps (5) to (7).
3. The method according to Claim 1, wherein said Establish MBMS Service Request message contains IP multicast address or APN, as well as other parameters of the BMS service.
4. The method according to Claim 1, wherein said First MBMS Context Request message contains a address of SGSN as well as other parameters on SGSN.
5. The method according to Claim 1, wherein said First MBMS Context Response message contains relevant parameters of the MBMS service, GGSN address as well as other parameters of GGSN.
6. The method according to Claim 1, wherein said First MBMS Context contains relevant parameters of the MBMS service, SGSN and GGSN.
7. The method according to Claim 1, wherein said Second MBMS Context Request message contains necessary parameters of the MBMS service, SGSN access address, other parameters on SGSN as well as relevant parameters of UE.
8. The method according to Claim 1, wherein said Second MBMS Context Response message contains relevant parameters of the MBMS service, GGSN access address and other parameters of GGSN.
9. The method according to Claim 1, wherein for a same kind of MBMS service, SGSN only establishes one First MBMS Context; and for all UEs that request for the MBMS service, SGSN establishes one Second MBMS Context for each UE, and associates all Second MBMS Contexts with said First MBMS Contexts.
10. The method according to Claim 1 further comprises the step of: if SGSN finds that it doesn't have relevant information on the UE that requests to establish MBMS service, then SGSN authenticates the UE to identify the legality of the UE.
1 1. The method according to Claim 1 further comprises the step of: after completing the establishment of said Second MBMS Context, SGSN sends an Establish MBMS Service
Response message to the UE.
12. The method according to Claim 11, wherein said Establish MBMS Service Response message sent to UE contains relevant parameters of MBMS, such as Group Identifier, encryption key, etc.
13. A method of establishing MBMS service between SGSN and GGSN comprises the steps of:
(1 ) GGSN receives an Establish First MBMS Context Request message from SGSN and saves the message; (2) GGSN constructs a Join MBMS Service Group Request message according to the message received in step (1) and sends the message to BM-SC;
(3) GGSN receives a Join MBMS Service Group Response message from BM-SC and saves the message; (4) GGSN establishes a First MBMS Context according to the messages received in step (1 ) and step (3);
(5) GGSN constructs an Establish First MBMS Context Response message according to the messages received in step (1) and step (3) and sends the message to SGSN; (6) GGSN receives an Establish Second MBMS Context Request message from
SGSN and saves the message;
(7) GGSN establishes a Second MBMS Context according to the message received in step (6) and said First MBMS Context having been established, and associates the Second MBMS Context with the First MBMS Context established in step (4) by one connection flag;
(8) GGSN constructs an Establish Second MBMS Context Response message according to said Second MBMS Context established in step (7), wherein the message containing relevant parameters of the MBMS service, GGSN access address and other parameters of GGSN.
14. The method according to Claim 13, wherein in addition to the necessary parameters on a certain MBMS service, said First MBMS Context Request message further contains SGSN access address and other parameters on SGSN.
15. The method according to Claim 13, wherein said Join MBMS Service Group Request message further contains relevant parameters on GGSN besides the necessary parameters on said MBMS service.
16. The method according to Claim 13, wherein said Join MBMS Service Group Response message contains all necessary parameters for using said MBMS service.
17. The method according to Claim 13, wherein said Establish First MBMS Context includes relevant parameters of the MBMS service, SGSN and GGSN.
18. The method according to Claim 13, wherein said Establish First MBMS Context Response message contains relevant parameters of the MBMS service, GGSN access address and other parameters of GGSN.
19. The method according to Claim 13, wherein said Establish Second MBMS Context Request message contains the necessary parameters of the MBMS service, SGSN access address, other parameters of SGSN as well as relevant parameters of UE.
20. The method according to Claim 13, wherein in addition to a part of parameters on MBMS service, SGSN and GGSN of the First MBMS Context, said Second MBMS Context further includes parameters on UE.
21. The method according to Claim 13, wherein said Establish Second MBMS Context Response message contains relevant parameters of the MBMS service, GGSN access address and other parameters of GGSN.
22. The method according to Claim 13, wherein for each MBMS service established between SGSN and GGSN, steps (1) to (5) only occur once.
23. The method according to Claim 13, wherein for each MBMS service established between SGSN and GGSN, GGSN establishes only one First MBMS Context, and for all the UEs that request for the MBMS service, GGSN establishes one Second MBMS Context for each UE and associates all the Second MBMBS Contexts with said First MBMS Context.
24. The method according to Claim 13 further comprises the step of: GGSN receives an Establish First MBMS Context Request message, constructs a Join MBMS Service Group message according to the message and sends it to BM-SC via Gi interface.
25. The method according to Claim 13 further comprises the steps of:
(1) After receiving an Establish Second MBMS Context Request message, GGSN constructs a UE Joining MBMS Service Group Notification message according to the message and sends it to BM-SC, wherein the notification message contains parameters on UE;
(2) GGSN receives a UE Joining MBMS Service Group Response message from BM-SC.
26. A method of deleting MBMS Service in SGSN comprises the steps of: ( 1) SGSN receives a Deactivate MBMS Service Request message from UE or RNC and saves the message;
(2) SGSN constructs a Delete Second MBMS Context Request message according to the message received in step (1);
(3) SGSN receives a Delete Second MBMS Context Response message from GGSN and deletes a Second MBMS Context;
(4) SGSN constructs a Delete First MBMS Context Request message and sends the message to GGSN;
(5) SGSN receives a Delete First MBMS Context Response message from GGSN and deletes a First MBMS Context.
27. The method according to Claim 26 further comprises the step of: after deleting said Second MBMS Context, SGSN constructs a Deactivate MBMS Service Response message and sends the message to UE.
28. The method according to Claim 26 further comprises the step of: after deleting said Second MBMS Context, SGSN releases a bearer used for said MBMS service together with UE.
29. The method according to Claim 26, wherein said Deactivate MBMS Service Request message contains IP multicast address or APN, and other parameters of MBMS service to be deactivated.
30. The method according to Claim 26, wherein said Delete Second MBMS Context Request message contains parameters on the MBMS service to be deactivated and parameters of SGSN.
31 . The method according to Claim 26, wherein the condition for executing step (4) and step (5) is that if after deleting said Second MBMS Context, SGSN finds that the First MBMS Context associated with said Second MBMS Context has no other Second
MBMS Context associating with it.
32. The method according to Claim 26, wherein in step (1): if SGSN finds that the Deactivate MBMS Service Request message comes from RNC, SGSN need not execute steps (2) and (3).
33. A method of deleting MBMS service in GGSN comprises the steps of:
(1) GGSN receives a Delete Second MBMS Context Request message from SGSN;
(2) GGSN constructs a Delete Second MBMS Context Response message according to the message received in step (1) and sends the message to SGSN, and deletes a Second MBMS Context;
(3) GGSN receives a Delete First MBMS Context Request message from SGSN;
(4) GGSN constructs a Delete First MBMS Context Response message according to the message received in step (3) and sends the message to SGSN, and deletes a First MBMS Context.
34. The method according to Claim 33 further comprises the step of: after deleting the Second MBMS Context, GGSN constructs a UE Leaving MBMS Service Group Notification message and sends the message to BM-SC, wherein said notification message contains the parameters of said UE.
35. The method according to Claim 33 further comprises the step of: after deleting the First MBMS Context, GGSN constructs a Leave MBMS Service Group message and sends the BM-SC via Gi interface, wherein said message contains parameters of said
GGSN.
36. The method according to Claim 33, wherein said Delete Second MBMS Context Request message contains parameters on the UE that will deactivate the MBMS service.
37. The method according to Claim 33, wherein said Delete First MBMS Context Request message contains parameters on the MBMS service to be deactivated.
PCT/KR2003/002095 2002-10-11 2003-10-11 A method of establishing and deleting mbms service in sgsn and ggsn WO2004034655A1 (en)

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