WO2009052760A1

WO2009052760A1 - A method, a system and a device for establishing the time-shifted tv service in broadcast service

Info

Publication number: WO2009052760A1
Application number: PCT/CN2008/072742
Authority: WO
Inventors: Jun Yan; Xiaoyan He; Jianfeng Zhong
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-10-19
Filing date: 2008-10-17
Publication date: 2009-04-30

Abstract

The embodiment of the invention discloses a method for establishing the time-shifted TV service in broadcast service, including: the service control function (SCF) receives the session modification request transmitting from the user equipment (UE), with the information of identifying the time-shifted TV service establishing request in it; when the SCF judges that the session modification request is the time-shifted TV service establishing request based on the information of identifying the time-shifted TV service establishing request, it initiates the time-shifted TV service establishing. The invention also discloses a system for establishing the time-shifted TV service in the broadcast service and a SCF entity. Using the invention can make that when the SCF judges the received session modification request is the time-shifted TV service establishing request, it initiates the time-shifted TV service establishing, so as to implement the establishing of the time-shifted TV service normally.

Description

Method, system and device for establishing time-shifted television service in broadcasting service

The present invention relates to the field of communications technologies, and in particular, to a method, system, and apparatus for establishing a time shift television service in a broadcast service. Background technique

IPTV (Internet Protocol Television) is a brand-new cable TV network that integrates various technologies such as Internet, multimedia, and communication to provide home users with a variety of interactive services including digital TV. technology. IPTV uses TCP (Transmission Control Protocol) / IP (Internet Protocol) as a bearer protocol for unicast, broadcast or multicast video services, effectively combining the three fields of TV network, telephone network and Internet. Together, it is the most representative business of triple play.

IP IMS (IP Multimedia Subsystem) is an IP-based standard system independent of access technologies, IMS and existing voice and data networks (whether such as PSTN (Public Switched Telephone Network), Fixed network users such as ISDN (Integrated Services Digital Network) and the Internet, or mobiles such as GSM (Global Systems for Mobile communications) and CDMA (Code Division Multiple Access) Network users) can communicate. The IMS architecture enables all types of clients to establish peer-to-peer IP communications and get the quality of service they need. In addition to session management, the IMS architecture also involves the functions necessary to complete service provisioning (eg registration, security, billing, bearer control, roaming). That is, the IMS system forms the core of the IP core network.

In order to realize unified control of IMS access to fixed network users, NASS (Network Attachment Sub-System) and RACS (Resource and Admission Control Subsystem) are introduced in the network architecture. NASS is used to complete the management of the user's attachment to the access network, including User authentication and network address allocation, location management. RACS (Resource and Admission Control Sub-system) is mainly used to complete policy control, resource reservation and admission control. The service/application level can use RACS to request access network to reserve related resources.

The IMS-based IPTV architecture will directly reuse the relevant functional entities of the IMS, and support the IPTV service by appropriately adding new functional entities and expanding the related functions of the existing functional entities.

FIG. 1 is a schematic diagram of networking of an IMS-based IPTV architecture in the prior art. As shown in Figure 1, each IPTV service function consists of a pair of IPTV SCF (Service Control Functions) and IPTV MF (Media Functions). The SCF is a SIP (Session Initiated Protocol) application server. The tasks include: (1) authorization during session initialization; (2) implementing a modification process to check user data to determine whether to allow user access. The business; (3) account control; (4) select the corresponding MF. The MF is responsible for the control and delivery of media streams and can be divided into MCF (Media Control Functions) and MDF (Media Distribute Functions). Among them, the tasks of the MCF mainly include: (1) processing the control of the media stream; (2) monitoring the state of the MDF (optional); (3) managing the interaction with the UE (User Equipment); (4) at the MCF When controlling multiple MDFs, select an MDF; (5) accurately perceive the distribution of the status and content of different MDFs; (5) generate billing information. The tasks of the MDF mainly include: (1) processing the delivery of the media stream; (2) reporting the status to the MCF (optional).

As can be seen from Figure 1, SCF and MF are functional entities that implement the following services: CoD (Content on Demand), BC (Broadcast Control), and PVR (Personal Video Recorder).

CoD is an on-demand service in IPTV. It implements its service control function through CoD-SCF in SCF, implements its media control function through CoD-MCF in MF and implements its media delivery function through CoD-MDF. BC is a broadcast service in IPTV. It implements its service control function through BC-SCF in SCF, implements its media control function through BC-MCF in MF and realizes its media delivery function through BC-MDF. PVR is The personal video recorder service in IPTV realizes its service control function through PVR-SCF in SCF, realizes its media control function through PVR-MCF in MF and realizes its media delivery function through PVR-MDF. The PVR service provides the recording function of the video media stream. According to the provided method, it can be divided into a network-based PVR and a personal-based PVR. The network-based PVR refers to: the network allocates a certain storage space for the user, and the network records the user. The media features to be recorded, and play them according to the user's wishes.

The CoD-SCF, the BC-SCF, and the PVR-SCF exchange messages with the UE through the IMS, and the media control messages between the CoD-MCF, the BC-MCF, and the PVR-MCF and the UE interact with each other through the reference point. The media data between the CoD-MDF, BC-MDF, and PVR-MDF and the UE interacts with the reference point through Xc,.

Secondly, in the network architecture, an SDF (Service Discover Function) and an SSF (Service Select Function) are added to provide necessary information for the UE when selecting an IPTV service. Among them, the SSF provides a list of available services that the UE can browse and select.

In addition, the multicast control function is included in the TPF (Transport Processing Functions); user data is stored in the UPSF (User Property Server Function).

When the user needs to modify the service when using the BC service, the session modification request is sent to the SCF, and the session modification request may be a modification request of the BC session, or may be a time-shifted TV when the user performs a control operation such as suspending the broadcast service. (in this article refers to the BC with Trick Play) business establishment request. However, when converting the BC service to the time-shifted TV service in the prior art, it does not explain how the SCF determines whether the session modification request sent by the UE is a modification request of the BC service or a request for the establishment of the time-shifted TV service, thereby causing the time-shifted TV service. Cannot be established normally. Summary of the invention

Embodiments of the present invention provide a method and system for establishing a time shift television service in a BC And the device, the time-shifted TV service is normally established in the BC.

To achieve the above objective, an embodiment of the present invention provides a method for establishing a time shift television service in a broadcast service, including:

The service control function SCF receives the session modification request sent by the user equipment UE, and carries information identifying the time-shifted TV service establishment request;

The SCF initiates the establishment of the time-shifted TV service when determining that the session modification request is a time-shift television service establishment request according to the information identifying the time-shifted television service establishment request.

On the other hand, the embodiment of the present invention further provides a method for determining to switch back to the BC service from the time-shifted TV service, including the following steps:

The service control function SCF receives the session modification request sent by the user equipment UE, and carries the request information that the identifier is switched back to the BC service from the time-shifted TV service;

The SCF, according to the identifier, cuts back the request information of the BC service from the time-shifted TV service, and determines that the session modification request is a switch-back request of the time-shifted TV service, and initiates a switch-back operation of the time-shifted TV service to the BC service.

On the other hand, the embodiment of the present invention further provides a system for establishing a time shift television service in a broadcast service, including: a service control function SCF entity and a user equipment UE,

The UE is configured to send a session modification request to the SCF entity, where the information that identifies the time-shifted TV service establishment request is carried;

The SCF entity is configured to receive the session modification request sent by the UE, and according to the information identifying the time-shifted TV service establishment request, determine that the session modification request is a time-shift television service establishment request, initiate a time-shifted television The establishment of business.

On the other hand, an embodiment of the present invention further provides a service control function SCF entity, including a receiving module, a determining module, and an initiating module.

The receiving module is configured to receive a session modification request sent by the user equipment UE, where the information that identifies the time-shifted TV service establishment request is carried;

The determining module is configured to: when the session modification request is a request for establishing a time-shifted TV service according to the session modification request of the receiving module, the initiating module initiates a request for establishing a time-shifted TV service.

Compared with the prior art, the technical solution provided by the embodiment of the present invention, the SCF receiving The session modification request sent by the UE carrying the identifier time-shifted TV service establishment request information, according to the time-shifted television service establishment request information, determines that the session modification request is a time-shift television service establishment request, and initiates the establishment of the time-shifted TV service. Therefore, the SCF can determine whether the received session modification request is a modification request of the BC service or a request for establishing the time-shifted TV service in the BC, thereby realizing the normal establishment of the time-shifted TV service. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic diagram of a networking diagram of an IMS-based IPTV architecture in the prior art; FIG. 2 is a flowchart of a method for establishing a time-shifted TV service in a BC according to an embodiment of the present invention; FIG. 3 is a BC in the embodiment of the present invention. A flow chart of a method for establishing a time-shifted television service;

4 is a flow chart of a method for establishing a time-shifted TV service in a BC according to Embodiment 2 of the present invention;

FIG. 5 is a flowchart of a method for establishing a time shift television service in a BC according to Embodiment 3 of the present invention; FIG.

FIG. 6 is a flowchart of a method for switching back to the BC service in the time-shifted TV service of the BC according to Embodiment 4 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. FIG. 2 is a flowchart of a method for establishing a time shift television service according to an embodiment of the present invention. As shown in Figure 2, the method includes:

In step 200, the SCF receives a session modification request sent by the UE, where the information carries the information identifying the time-shifted TV service establishment request;

Then, in step 201, according to the information identifying the time-shifted TV service establishment request in the request, when the session modification request is determined to be a time-shift television service establishment request, the establishment of the time-shifted TV service is initiated.

Embodiment 1:

The information identifying the time-shifted TV service establishment request in this embodiment is the service identifier of the time-shifted TV service, and the SCF determines whether the session modification request is a time-shifted TV service establishment request according to the service identifier in the session modification request.

FIG. 3 is a flow chart of a method for establishing a time shift television service in a BC according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:

The process of establishing a BC service is the same as that of the prior art, and details are not described herein again.

Step 300: The UE sends a session modification request carrying the service identifier to the SCF by using an invitation (relnvite) of the SIP protocol.

In this step, the UE sends a session modification request message to the SCF through the Core IMS. In order to simplify the description, the description in this step and the following description simplifies the communication between the UE and the SCF through Core IMS to communicate between the UE and the SCF.

For example, in the session modification request message, the UE uses the defined header field to carry the service identifier of the time-shifted TV service.

For example, P-Preferred-Service=urn:um-xxx: TsTV.TISPAN.IPTV header field, where "TsTV.TISPAN.IPTV" is the service identifier of the time-shifted TV service. Of course, in actual applications, in addition to the service identifiers exemplified above, other forms of service identifiers may also be used. For example, if the BC with Trick service is used as a sub-application of the BC service, P-Preferred-Service can also be used: urn:urn-xxx:broadcast.tispan.iptv and Accept-Contact:urn: urn-xxx:broadcast .tispan.iptv-application-trickplay also indicates that the session modification request is a request for the establishment of a time-shifted TV service in BC, where "broadcast.tispan.iptv" and "broadcast.tispan.iptv-application-trickplay" Combined as a business identifier for time-shifted TV services in BC. The urn-xxx is the number assigned later when the service identifier is registered in the IANA (Internet Assigned Numbers Authority).

Step 301: The SCF determines, according to the service identifier in the relnvite message, that the session modification request is a request for establishing a time-shifted TV service.

For example, the SCF determines that the session modification request message is a time-shifted TV service establishment request according to "TsTV.TISPAN.IPTV" in the P-Preferred-Service=urn:um-xxx:TsTV.TISPAN. IPTV header field. Or, according to P-Preferred-Service: urn: urn-xxx: broadcast.tispan.iptv and Accept-Contact: urn: urn-xxx: broadcast.tispan.iptv - application-trickplay, determine that the session tampering request message is Request to establish a mobile TV service.

If the SCF determines, according to the service identifier in the received session modification request message, that the session modification request message is not a time-shifted TV service establishment request, the method is modified according to the method of modifying the BC service in the prior art. Let me repeat.

Step 302: The SCF sends an initial setup request of the time-shifted TV service to the MCF through an Invite message of the SIP protocol.

In this step, when the SCF determines that the user has the right to use the time-shifted TV service, the P-Preferred-Service=urn:um-xxx:TsTV.TISPAN.IPTV header field in step 301 is modified to P-Asserted-Service. =urn:um-xxx: After the TsTV.TISPAN.IPTV header field, the MCF is sent a request to establish a time-shifted TV service. Alternatively, after the P-Preferred-Service: urn: urn-xxx: broadcast .tispan. iptv header field in step 301 is modified to the P-Asserted-Service:urn:urn-xxx:broadcast.tispan.iptv header field, A request to establish a time-shifted TV service is sent to the MCF.

Step 303 ~ Step 304: After establishing the time-shifted TV service, the MCF and the MDF return a setup response 200 OK to the SCF, and the SCF returns a setup response 200 OK to the UE, and establishes a media channel between the UE and the MDF.

In this step, the specific process of establishing the time-shifted TV service for the UE by the MCF and the MDF is the same as that of the prior art, and details are not described herein again.

It can be seen that the embodiment carries the service identifier in the session modification request message, so that The SCF can determine that the received session request message is a setup request for the time-shifted TV service, so that the time-shifted TV service in the BC can be established normally.

Embodiment 2:

In this embodiment, the information identifying the time-shifted TV service request is a newly defined header field, and the SCF determines, according to the newly defined header field carried in the session modification request, whether the session request message is a request for establishing a time-shifted TV service in the BC.

Step 400: The UE sends a session modification request carrying the newly defined header field to the SCF by using the relnvite message of the SIP protocol.

For example, the newly defined Iptv-Service-Type: TsTV header field in the SIP message indicates that the session modification request message is a request for establishing a time-shifted TV service in the BC.

Step 401: The SCF determines, according to the newly defined header field in the relnvite message, that the session modification request is a request for establishing a time-shifted TV service.

For example, the UE and the SCF can identify the header field Iptv-Service-Type that identifies the time-shifted TV service establishment request: TsTV. When the SCF receives the session modification request, it finds that the request carries the newly defined header field Iptv-Service-Type: In the case of TsTV, it is determined that the session modification request message is a request for establishing a time-shifted TV service.

If the SCF does not find the newly defined header field of the time-shifted TV service establishment request in the session modification request, the SCF determines that the session modification request message is not the time-shifted TV service establishment request, and is modified according to the prior art. The method flow of the BC service is performed and will not be described here.

Steps 402 to 404: The SCF sends an initial setup request for the time-shifted TV service to the MCF through the Invite message of the SIP protocol. After the MCF controls the MDF to establish the media resource required for the time-shifted TV service, the SCF returns a setup response to the SCF, 200 OK, by the SCF. The establishment response 200 OK is returned to the UE, and the media channel between the UE and the MDF is established.

The specific process of establishing a time shift service by the SCF, the MCF, and the MDF is the same as that of the prior art, and is not described here.

Of course, in addition to the newly defined header field identifying the time-shifted television service establishment request illustrated in this embodiment, other forms of header fields representing the time-shifted television service establishment request may be used. It can be seen that, in this embodiment, the newly defined header field that identifies the time-shifted TV service establishment request is carried in the session modification request message, so that the SCF can determine that the received session request message is a request for establishing a time-shifted TV service, thereby making the BC The time-shifted TV service can be established normally.

Embodiment 3:

In this embodiment, the SCF determines, according to the unicast media description information carried in the session modification request, that the session request message is a request for establishing a time-shifted TV service.

FIG. 5 is a flowchart of a method for establishing a time shift television service in a BC according to Embodiment 3 of the present invention. As shown in FIG. 5, the method includes the following steps:

Step 500: The UE sends a session modification request carrying the unicast media description information to the SCF by using the relnvite message of the SIP protocol. The port number in the unicast media description information carried in the port is not 0, indicating that this is a new unicast media stream.

In this step, the media line information in the SDP (Session Description Protocol) description of the relnvite carries the unicast media description information.

In this embodiment, the unicast media description information of the UE may be used to establish an RTP (Real Time Transmission Protocol) stream channel or an RTSP (Real Time Stream Protocol) control channel, where the UE provides media information. Unicast media description information.

The unicast media description information is used to establish an RTP stream channel:

When the UE does not obtain the multicast address corresponding to the channel, the media line information in the SDP description may be:

m=video 4011 RTP/AVP 99

c=IN IP4 10.12.1.2

a=rtpmap:99 H.261

10.12.1.2 is the address information in the unicast media description of the UE.

When the UE has obtained the multicast address corresponding to the channel, the media line information in the SDP description may be:

m=video 4002 RTP/AVP 99

c=IN IP4 224.12.1.2 a=rtpmap:99 H.261 m=video 3002 RTP/AVP 99

c=IN IP4 224.12.3.45

a=rtpmap:99 H.261 m=video 4011 RTP/AVP 99

c=IN IP4 10.12.1.2

a=rtpmap:99 H.261

Among them, 224.12.1.2 and 224.12.3.45 are the multicast addresses of the BC service, and 10.12.1.2 is the unicast media description information of the UE.

When the unicast media description information is used to establish an RTSP control channel, the media line information in the SDP description may be:

m=application 9 TCP/RTSP rtsp

c=IN IP4 10.12.1.2

a=fmtp:rtsp request-uri: rtsp:〃 video. example. com

a=fmtp:rtsp version: 2.0

a=fmtp:rtsp h-accept-ranges: NPT

Step 501: When the session is a session of the BC service, the SCF determines, according to the unicast media description information in the relnvite message, that the session modification request is a request for establishing a time-shifted TV service.

In the prior art, the class D IP address in the range of 224.0.0.0-239.255.255.255 is a multicast address, and the IP address outside the range of 224.0.0.0-239.255.255.255 is a unicast address. In this embodiment, when the SCF receives the session modification request, it finds that the SDP description carries the IP address outside the range of 224.0.0.0-239.255.255.255, that is, the SDP description carries the unicast media description information, and When the port number is non-zero, it is determined that the session modification request is a request for establishing a time-shifted TV service.

If the IPV6 address technology is used, the SCF determines whether it is a multicast address according to whether the first 8 Bits of the address information is 1111 1111, that is, if the address information is judged to be When FF is started, it can be determined that the address is a multicast address, otherwise it is determined that the address is a unicast address.

If the SCF does not find the IP unicast media description information or the port number in the corresponding m line is 0 in the SDP description of the session modification request, it is determined that the session modification request message is not the time-shifted TV service establishment. The request is then executed according to the method of modifying the BC service in the prior art, and details are not described herein again.

Step 502 to step 504: The SCF sends an initial setup request for the time-shifted TV service to the MCF through the Invite message of the SIP protocol. After the MCF controls the MDF to establish the media resource required for the time-shifted TV service, the SCF returns a setup response to the SCF, 200 OK, by the SCF. The establishment response 200 OK is returned to the UE, and the media channel between the UE and the MDF is established.

The specific process of establishing a time shift service by the SCF, the MCF, and the MDF is the same as that of the prior art, and is not described here. The SDP description in this embodiment is only an example, and other changes may be made in the actual application, as long as the unicast media description information can be carried.

In the fourth embodiment, the SCF receives the session modification request sent by the user equipment UE, and carries the request information that the identifier is switched back to the BC service from the time-shifted TV service; the SCF switches back to the BC service from the time-shifted TV service according to the identifier. The request information is used to determine that the session modification request is a switch-back request of the time-shifted TV service, and initiates a switch-back operation of the time-shifted TV service to the BC service. The request information that the portable identifier is switched back to the BC service from the time-shifted TV service is: a deletion indication of a unicast media stream required to establish a time-shifted television service, and the unicast medium required for establishing a time-shifted television service The deletion of the flow indication is a port number in the unicast media description; when the port number in the unicast media description is 0, the session modification request is a switchback request of the time shift service. The unicast media stream of the UE is a media transmission channel or a media control channel.

FIG. 6 is a flowchart of a method for cutting back to a BC service in a time-shifted TV service of a BC according to Embodiment 4 of the present invention, including the following steps:

Step 600: The UE sends a session modification request carrying the UE unicast media description information and the multicast media description information to the SCF by using the relnvite message of the SIP protocol.

In this step, the media line information in the SDP description of the renvite, where the port number of the unicast media description information carried is 0, and the number of BC services carried therein is The port number in the broadcast media description information is non-zero. The port number in the unicast media description information is 0, indicating that the unicast media stream needs to be deleted.

In this embodiment, the unicast media description information of the UE may be the unicast media description information provided by the UE in the media information when the BC time-shifted TV service is established to establish an RTP stream channel or an RTSP control channel.

The unicast media description information is used to establish an RTP flow channel, and the unicast media description information in the SDP description may be:

m=video 0 RTP/AVP 99

c=IN IP4 10.12.1.2 When this unicast media description information is used to establish an RTSP control channel, its media line information in the SDP description can be:

m=application 0 TCP/RTSP rtsp

c=IN IP4 10.12.1.2

The multicast media description information corresponding to the channel in the SDP description may be: m=video 4002 RTP/AVP 99

c=IN IP4 224.12.1.2

a=rtpmap:99 H.261 m=video 3002 RTP/AVP 99

c=IN IP4 224.12.3.45

a=rtpmap:99 H.261 Step 601: When the currently established session is a session of the BC time-shifted TV service, the SCF uses the port number in the unicast media description information in the renvv message to be 0, and represents the BC channel. The port number in the broadcast media description information is not 0, and the session modification request is determined to be a switch-back request of the time-shifted TV service to the BC service.

In the prior art, Class D IP grounds within the range of 224.0.0.0-239.255.255.255 The address is a multicast address, and the IP address outside the range of 224.0.0.0-239.255.255.255 is a unicast address. In this embodiment, when the SCF receives the session modification request, and finds that the SDP description carries the unicast address with the port number 0, and carries the multicast address with the port number other than 0, the session modification is determined. Request for a switch-back request for a time-shifted TV service to the BC service.

If the IPV6 address technology is used, the SCF determines whether the address is a multicast address according to whether the first eight Bits of the address information are 1111 1111, that is, if it is determined that the address information starts with FF, the address is determined to be a multicast address, otherwise Make sure the address is a unicast address.

Step 602 to step 604: The SCF sends a release request of the time-shifted TV service to the MCF through the Bye message of the SIP protocol, and the MCF controls the MDF to release the media resource occupied by the original time-shifted TV service, and returns a setup response 200 OK to the SCF. The SCF will return a response 200 OK to the UE to complete the release of the media channel between the UE and the MDF.

The specific process of the SCF to establish the BC service is the same as the prior art, and is not described here. The SDP description in this embodiment is only an example, and other changes may be made in the actual application, as long as the unicast media description information and the multicast media description information can be carried.

Since the modification of the BC service is for the modification of the multicast service, when the UE carries the unicast media description information in the session modification request, the SCF learns that the session modification request is a time-shifted TV establishment request, so this embodiment implements The normal establishment of the time-shifted TV service in BC.

The embodiment of the invention further provides a system for establishing a time shift television service in a broadcast service, including a UE and an SCF entity. The UE is configured to send a session modification request to the SCF entity, where the information carries the information identifying the time-shifted TV service establishment request, and the SCF entity is configured to receive the session modification request sent by the UE, according to the identifier for the time-shifted TV service establishment request. The information, when determining that the session modification request is a request for establishing a time-shifted TV service, initiates establishment of a time-shifted TV service.

Specifically, the SCF entity includes a receiving module and a determining module, where the receiving module is configured to receive a session modification request sent by the UE, where the bearer time-shifted TV service is established The requesting information is used by the initiating module to initiate a time-shifting TV service establishment request when the session modification request is a time-shifted TV service establishment request according to the session modification request of the receiving module. After the initiating module further modifies the defined header field carrying the information identifying the time-shifted TV service establishment request, it is carried in the establishment request of the time-shifted TV service.

It can be seen from the above that, in the technical solution provided by the embodiment of the present invention, the SCF receives the session modification request that carries the identifier time-shifted TV service establishment request information sent by the UE, and determines the time-based television service establishment request information according to the session modification request information. When the session modification request is a request for establishing a time-shifted TV service, the establishment of the time-shifted TV service is initiated, so that the SCF can determine whether the received session modification request is a modification request of the BC service or a request for establishing the time-shifted TV service in the BC. Therefore, the normal establishment of the time-shifted TV service can be realized.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. The word "step" described in the above embodiments of the present invention does not represent the order in which the embodiment performs the method.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A method for establishing a time shift television service in a broadcast service, the method comprising:

2. The method according to claim 1, wherein the information identifying the time-shifted television service establishment request is a service identifier of the time-shifted television service;

The SCF determines, according to the information identifying the time-shifted TV service establishment request, that the session modification request is a time-shifted TV service establishment request:

The SCF determines, according to the service identifier carried in the session modification request, that the session modification request is a request for establishing a time-shifted TV service.

3. The method according to claim 2, wherein the service identifier of the time-shifted television service is:

The service identifier of the time-shifted TV service is carried by writing the service identifier of the time-shifted TV service in the defined header field.

4. The method of claim 3, wherein the defined header field of the service identifier of the write time shift television service is:

"P-Preferred-Service=urn:urn-xxx: TsTV.TISPAN.IPTV";

Or

"P-Preferred-Service: urn:urn-xxx:broadcast.tispan.iptv" and "Accept -Contact: urn: urn-xxx:broadcast.tispan.iptv-application-trickplay,,.

5. The method according to claim 4, wherein the establishing of the time-shifted TV service by the SCF is:

The SCF, after modifying the "P-Asferred-Service" in the defined header field of the service identifier of the time-shifted TV service, is carried in the initial setup request of the time-shifted TV service.

The method according to claim 1, wherein the information identifying the time-shifted television service establishment request is a newly defined header field of the identifier time-shifted television service establishment request; and the SCF is time-shifted according to the identifier The television service establishes the requested information, and determines that the session modification request is a time-shift television service establishment request:

The SCF determines, according to the header field of the identifier time-shifted TV service establishment request carried in the session modification request, that the session modification request is a request for establishing a time-shifted TV service.

The method according to claim 1, wherein the information identifying the time-shifted television service establishment request is unicast media description information of the UE;

The SCF determines, according to the unicast media description information of the UE carried in the session modification request, that the session modification request is a request for establishing a time-shifted TV service.

The method according to claim 7, wherein the unicast media description information of the UE is used to establish unicast media description information in media information of a real-time transport protocol RTP stream channel, or used to establish real-time The streaming protocol RTSP controls the unicast media description information in the media information of the channel.

9. A method for judging switching back to a BC service from a time-shifted television service, characterized by comprising the steps of:

The method for determining the time from the time-shifted television service to the BC service according to claim 9, wherein the request information of the portable identification from the time-shifted television service to the BC service is: establishing a time-shifted television service Deletion instructions for the required unicast media stream.

11. The method of determining to switch back from a time-shifted television service to a BC service according to claim 10, wherein:

The deletion indication of the unicast media stream required to establish the time-shifted TV service is a unicast medium The port number in the body description; when the port number in the unicast media description is 0, the session modification request is a switchback request of the time shift service.

The method for determining that the time-shifted TV service is switched back to the BC service according to any one of claims 9 to 11, wherein the unicast media stream of the UE is a media transmission channel or a media control channel. .

13. A system for establishing a time-shifted television service in a broadcast service, the system comprising: a service control function SCF entity and a user equipment UE,

14. The system according to claim 13, wherein the information identifying the time-shifted television service establishment request is: a service identifier of a time-shifted television service, a newly defined header field of a time-shifted television service establishment request or The unicast media description information of the UE.

The system according to claim 14, wherein the unicast media description information of the UE is used to establish unicast media description information in media information of a real-time transport protocol RTP stream channel, or used to establish real-time The streaming protocol RTSP controls the unicast media description information in the media information of the channel.

The system according to claim 13, wherein the SCF entity further modifies the defined header field carrying the information identifying the time-shifted TV service establishment request, and then carries the request in the time-shift television service establishment request.

A service control function SCF entity, wherein the SCF entity comprises a receiving module, a determining module, and an initiating module,

The SCF entity according to claim 17, wherein the information identifying the time-shifted TV service establishment request is: a service identifier of the time-shifted television service, and a newly defined header field of the identifier time-shifted television service establishment request Or the unicast media description information of the UE.

The SCF entity according to claim 18, wherein the unicast media description information of the UE is used to establish unicast media description information in media information of a real-time transport protocol RTP stream channel, or used to establish The real-time streaming protocol RTSP controls the unicast media description information in the media information of the channel.

The SCF entity according to claim 17, wherein the initiating module further modifies the defined header field carrying the information identifying the time-shifted television service establishment request, and then carries the request in the time-shift television service establishment request.