WO2008110094A1

WO2008110094A1 - Method and system for realizing iptv service's switch

Info

Publication number: WO2008110094A1
Application number: PCT/CN2008/070422
Authority: WO
Inventors: Feng Wang; Zhaojun Peng; Jun Yan
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-03-14
Filing date: 2008-03-06
Publication date: 2008-09-18
Also published as: CN101267537A

Abstract

A method and system for switching IPTV service are provided. By introducing switch controlling function entity and/or media anchoring function entity into IPTV system, and by building the media connection of switch receiving entity at first, and then cutting off the media connection of switch initiating entity, it is realized that the switch of IPTV service from switch initiating entity to switch receiving entity, and the continuity of IPTV service during switching is ensured,.

Description

Method and system for realizing network television service switching

The present invention relates to the field of network television technologies, and more particularly to a method and system for implementing network television service switching, and a device for implementing a media anchoring function and a device for implementing a switching control function.

Background technique

Internet TV (IPTV) is a streaming-based business based on broadband networks. Compared with the traditional TV service, IPTV provides a more flexible and flexible service and an integrated network TV value-added service platform, including communication, data, video, audio and other business content.

At present, the Internet TV service is mainly divided into: Live TV (LTV, Linear TV) service and Video on Demand (VOD, Video on demand) business. V0D programs are transmitted in unicast mode. LTV programs are transmitted in multicast mode.

FIG. 1 is a schematic structural diagram of a network television system in the prior art. As shown in FIG. 1, the existing network television system generally includes: a content source, a user equipment UE, a session control function entity, a network television application server, an IPTV AS, and some other network entities that interact with the IPTV AS. The content source is used to provide the IPTV service content to the UE; the UE is the device that the user receives the IPTV service; the session control function entity is used for the session control, management, and routing; and the IPTV AS is the application server that processes the IPTV service request logic.

The IPTV service switching refers to the switching characteristics between different access technologies supporting IPTV services and across different access technologies. The essence of the IPTV service is the change of the media channel caused by the change of the access link. It is divided into user side switching and content source side switching. In the process of switching the network television service, it is necessary to maintain the ongoing session control and the continuous uninterrupted user plane media stream, that is, to ensure the continuity of the IPTV service.

However, the prior art does not provide a technical solution for implementing network television service switching.

Summary of the invention

In view of this, the embodiment of the present invention further provides a handover method, which implements a network. The switching of the TV service ensures the continuity of the network TV service during the handover process. The embodiment of the invention further provides a device for implementing a handover control function, which implements handover of a network television service and ensures continuity of the network television service in the handover process.

The embodiment of the invention also provides a method for media anchoring, which ensures the continuity of the network television service in the handover process.

Embodiments of the present invention also provide an apparatus for implementing a media anchoring function, which ensures continuity of a network television service during handover.

The embodiment of the invention further provides a system for implementing network television service switching, which implements switching of network television services and ensures continuity of network television services in the handover process.

The embodiment of the invention further provides a method for implementing network television service switching, which implements the switching of the network television service and ensures the continuity of the network television service in the handover process.

A method of switching, the method comprising:

Receiving a network television service switching request sent by the handover initiation entity;

Transmitting, to the streaming media content delivery entity or user equipment, handover control information, the handover control information controlling the streaming media content delivery entity or the user equipment, first establishing a media connection with the handover accepting entity, and then cutting off the connection with the handover initiation entity Media connection.

A device for implementing a switching function, comprising:

a handover control module, configured to receive a service handover request sent by the handover initiation entity, and send handover control information to the UE and/or the streaming media content delivery entity, where the handover control information controls the streaming media content delivery entity or the user equipment to establish and switch Accept the media connection between the entities and then disconnect the media connection with the switch originating entity.

A method of media anchoring, the method comprising:

After receiving the handover control information, the media anchoring function entity establishes a media connection with the handover accepting entity;

The media anchoring function entity disconnects the media connection with the switching originating entity.

A device for implementing a media anchoring function, comprising: The media stream transceiver module is configured to receive the media stream sent by the content source, and forward the media stream to the UE; and the command receiving module is configured to receive the switch control information when the network television service is switched, and control the media stream transceiver module to first establish and The switch accepts the media connection between the entities, and then cuts off the media connection between the media stream transceiver module and the handover originating entity.

A system for implementing network television service switching includes:

a media anchoring function entity, configured to forward the media stream of the content source to the UE, and after receiving the handover control information, first establish a media connection with the handover accepting entity, and then cut off the media connection with the handover initiation entity .

A system for implementing network television service switching, characterized in that:

a handover control function entity, configured to: after receiving the handover request, send handover control information; the handover control information controls a streaming media content delivery entity or user equipment, first establishes a media connection with the handover accepting entity, and then disconnects and switches the initiation entity Media connection between.

A method for implementing network television service switching includes:

A. The handover control function entity sends the media control information to the media anchor function entity, and the media anchor function entity receives the media stream sent by the content source and forwards the message to the UE under the control of the media control information;

B. The handover control function entity sends handover control information to the media anchor function entity, and the media anchor function entity simultaneously sends the media stream to the handover initiation entity and the handover accepting entity under the control of the handover control information, or simultaneously switches from The media stream selected by the sending entity and the receiving entity selects to forward to the UE, and then cuts off the media connection with the handover initiating entity.

According to the foregoing technical solution, it can be seen that the embodiment of the present invention introduces a handover control function entity and/or a media anchor function entity in the network television system, and controls, first establishes a media connection of the handover acceptance entity, and then cuts off the media of the handover initiation entity. The connection scheme realizes the switching of the network television service from the handover initiation entity to the handover acceptance entity, and ensures the continuity of the network television service in the handover process.

DRAWINGS 1 is a schematic structural diagram of a network television system in the prior art;

2 is a schematic diagram of a method for implementing network television service switching according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a method for implementing network television service switching according to another embodiment of the present invention; FIG. 4 is a schematic diagram of implementing network television according to an embodiment of the present invention; FIG. 5 is a flow chart of a process of establishing a service connection on the user side of the system shown in FIG. 4;

6 is a flow chart of a process of performing user-side service switching in the system shown in FIG. 4;

7 is a flow chart of a process of establishing a service connection on the content source side of the system shown in FIG. 4; FIG. 8 is a flowchart of a process of performing content source side service switching by the system shown in FIG.

FIG. 9 is a flowchart of a process for establishing an LTV service connection on the user side of the IMS system according to the embodiment of the present invention; FIG. 10 is a process flow diagram of the LTV service switching from UE1 to UE2 in the IMS system according to the embodiment of the present invention;

11 is a flowchart of a process for establishing an industry VOD service connection on the user side of the IMS system according to the embodiment of the present invention; FIG. 12 is a process flow diagram of the VOD service switching from UE1 to UE2 in the IMS system according to the embodiment of the present invention;

FIG. 13 is a process flow diagram of establishing an LTV service connection on an content source side of an IMS system according to an embodiment of the present invention;

14 is a flow chart showing a process of switching an LTV service from a content source 1 to a content source 2 in an IMS system according to an embodiment of the present invention;

15 is a process flow diagram of establishing an V0D service connection on an content source side of an IMS system according to an embodiment of the present invention;

16 is a flowchart of a process for switching a V0D service from a content source 1 to a content source 2 in an IMS system according to an embodiment of the present invention;

17 is a structural block diagram of an apparatus for implementing a handover control function according to an embodiment of the present invention; and FIG. 18 is a structural block diagram of an apparatus for implementing a media anchoring function according to an embodiment of the present invention.

detailed description

In the embodiment of the present invention, a switching control function entity is introduced in the network television system, and is intended to replace ιρτν The AS takes over the delivery control of the streaming media content, that is, the switching of the network television service is completed without the participation of the IPTV AS, including the switching on the user side and the switching on the content source side.

In the embodiment of the present application, the network television service is handed over from the handover initiation entity to the handover accepting entity. For example, when the network television service is handed over from the UE1 to the UE2, the UE1 is a handover initiation entity, and the UE2 is a handover acceptance entity; When switching from content source 1 to content source 2, content source 1 is a handover originating entity, and content source 2 is a handover accepting entity.

FIG. 2 is a schematic diagram of a method for implementing network television service switching according to an embodiment of the present invention. As shown in FIG. 2, the method introduces a handover control function entity in an existing network television system. The streaming media content delivery entity includes a content source and an entity that the media stream may pass before reaching the UE, a media anchoring functional entity as will be mentioned below, and the content source may be a UE or a media server that provides media content to the user.

In the initial service establishment process, after the handover control function entity obtains the service establishment information, it takes over the function of the media control, that is, the control information sent by the IPTV AS to the UE and the streaming media content delivery entity is received by the handover control function entity, and is processed. Then send it to the UE and the streaming content delivery entity.

In the service switching process, the handover control function entity receives the handover request, sends the handover control information to the streaming media content delivery entity and/or the UE, and controls the streaming media content delivery entity and the UE to complete the network television service from the handover initiation entity to the handover acceptance entity. Switch.

The specific handover is: first establishing a media connection between the streaming media content delivery entity and/or the UE and the handover accepting entity, and then cutting off the media connection of the streaming media content delivery entity and/or the UE and the handover initiation entity. In the case that the streaming media content delivery entity is a media server or media anchoring function entity, if the media receiver UE is to be handed over from UE1 to UE2, the streaming media content delivery entity simultaneously sends the media stream to UE1 and UE2, and then cuts off The media connection of the UE1 is such that the content is only sent to the UE2; if the content source UE is to be switched from the content source UE1 to the content source UE2, the streaming media content delivery entity simultaneously receives the media streams of the content source UE1 and the content source UE2, and only forwards the content source. The media of the UE1 is sent to the media receiver terminal, and then the reception with the content source UE1 is cut off, and the media of the content source UE2 is forwarded to the media for receiving. Party terminal.

In the network television service, if the IPTV AS has new control over the media delivery, the control information is still intercepted by the handover control function entity, and the media control of the streaming media content delivery entity and the UE is completed by the handover control function entity.

In the network television system given in the embodiment shown in Fig. 1, there may be multiple IPTV ASs that perform different services. Therefore, each IPTV AS is required to support the handover function, and the related service switching process is completed when the network television service switching on the user side or the content source side is performed. But this mode of work is inefficient. In the method of the embodiment shown in FIG. 1, the handover request is sent to the handover control function entity, and the handover control function entity controls the entire service handover process, and the service switching process is shielded from the IPTV AS, thereby improving work efficiency.

In another embodiment of the present invention, a network anchoring function entity is configured to receive a media stream sent by a content source, and forward the media stream to the UE; and the media anchoring function entity receives the switching control information. Under the control, first establish a media connection with the handover accepting entity, and then cut off the media connection with the handover originating entity.

FIG. 3 is a schematic diagram of a method for implementing network television service switching according to still another embodiment of the present invention. As shown in FIG. 3, the method introduces a media anchoring functional entity in an existing network television system.

In the initial service establishment process, the media anchoring function entity inserts itself into the content source and the UE under the control of the control instruction, so that the media stream originally transmitted between the content source and the UE is changed to be anchored through the media. The functional entity forwards, that is, the media anchoring function entity receives the media stream from the content source and forwards it to the UE. The control commands can come from the IPTV AS or from the switching control function entity, provided that the handover control function entity has been introduced in the network television system.

The service establishment process may involve the media anchoring function entity to perform unicast-multicast, unicast-unicast, multicast-multicast, multicast-unicast conversion on the media stream from the content source to the UE. When the media stream propagation mode of the content source to media anchor function entity is multicast, the media anchor function entity has a multicast joining capability, so that the media group can be added to the multicast group of the content source. The media anchoring function entity also has a media control request proxy function, such as receiving an RTSP request sent by the UE and forwarding it to the content source. During the handover process, if the content source side is switched, the media anchor function entity keeps the media connection with the UE unchanged under the control of the control command, and only changes the media flow direction with the content source; When the UE performs the handover, the media anchor function entity keeps the media connection with the content source unchanged under the control of the control command, and only changes the media flow direction with the UE.

It can be seen that, in the method of the embodiment shown in FIG. 3, the function of the media anchoring function entity is to implement a function of fixed media stream flow between the content source and the UE, that is, regardless of how the UE switches, the content source only needs to media. The stream is delivered to the media anchoring function entity without changing the media stream of the content source as the UE switches; likewise, regardless of how the content source is switched, the UE only needs to receive the media stream from the media anchoring function entity, without the content The switching of the source changes the flow direction of the media stream of the UE.

In order to make the objects, technical solutions and advantages of the present invention more clear, and to facilitate the description, the switching control function entity and the media anchoring function entity are simultaneously introduced in the network television system, and the present invention will be described with reference to the accompanying drawings.

FIG. 4 is a structural block diagram of a system for implementing network television service switching according to an embodiment of the present invention. As shown in FIG. 4, the system includes: a handover control function entity 101, and a media anchor function entity 102. Other entities implementing the basic functions of the network television system are also shown in FIG. 4, including: a session control function entity 103, a user equipment (User Equipment) 104, a content source 105, and a network television application server (IPTV AS, IPTV App ica t Ion Server 106 and other network entities 107.

In FIG. 4, the handover control function entity 101 is configured to receive a service request forwarded by the session control function entity 103, and control the media anchor function entity 102 to process the media stream according to the service request. The control information sent by the handover control function entity 101 to the media anchor function entity 102 may be forwarded by the session control function entity 103 or directly to the media anchor function entity 102, as indicated by the dashed arrow in FIG.

The media anchoring function entity 102 processes the media stream under the control of the handover control function entity 101, receives the IPTV service media stream sent by the content source 105, and transmits the IPTV service media stream to the UE 104.

The session control function entity 103 is configured to perform session control, management, routing, and the like. For example, The service request route of the UE 104 is forwarded to the handover control function entity 101, and the service response is sent to the UE 104; the control information of the handover control function entity 101 is forwarded to the media anchor function entity, which will be processed by the media anchor function entity 102. The service request is sent to the IPTV AS 106, and the feedback of the service response and the like is received.

The UE 104 is a device for the user to receive the network television service, and is configured to initiate various IPTV service requests to the session control function entity 103, and receive the request response replied by the session control function entity 103. The IPTV service media sent by the media anchor function entity 102 is received. flow.

The content source 105 is an entity that provides IPTV service content to the user for transmitting the IPTV service media stream to the media anchoring function entity 102. The content source 105 can be a media server or a UE.

The IPTV AS 106 is an application server for processing IPTV service request logic.

The other network entity 107 is an entity that interacts with the IPTV AS 106 during the execution of the IPTV service logic.

In the following, the system shown in FIG. 4 is further described in detail for two cases where the user side has a service switching requirement and the content source side has a service switching requirement.

Figure 5 is a flow chart showing the process of establishing a service connection on the user side by the system shown in Figure 4. As shown in Figure 5, the following steps are included:

Step 501: The UE 104 initiates an IPTV service request carrying the UE session description information to the session control function entity 103, and the session control function entity 103 sends the IPTV service request to the handover control function entity 101.

Step 502: The handover control function entity 101 controls the media anchor function entity 102 to perform media processing by using the session control function entity 102, and converts the UE session description information into the media anchor function entity session description information, and returns to the handover control function entity 101. . The handover control function entity 101 transmits the media anchor function entity session description information to the session control function entity 102.

Step 503: The session control function entity 103 initiates an IPTV service request carrying the media anchor function entity session description information to the IPTV AS 106.

Step 504: The IPTV AS 106 receives the IPTV carrying the media anchor function entity session description information. After the service request, it interacts with other network entities 107 to complete the IPTV service processing, and returns a service response to the session control function entity 103, and the session control function entity 103 returns the service response to the media anchor function entity 102.

Step 505: After receiving the service response, the media anchoring function entity 102 sends the media anchor function entity session description information to the UE 104 to complete the service connection with the UE 104.

In the service connection established by the user side shown in FIG. 5, the IPTV service media stream may be transmitted from the content source 105 to the media anchor function entity 102 in a unicast or multicast manner, such as when the LTV service is used. The VoIP service media stream of the media anchoring function entity 102 to the UE 104 may also be unicast or multicast, for example, according to the number of users requesting the same service.

The media anchoring entity 102 has a multicast joining capability, and when the media stream of the content source 105 to the media anchoring functional entity 102 is multicast, it can join the multicast group and between the media anchoring functional entity 102 and the UE 104. When the media stream is unicast, the media anchoring entity 102 performs multicast to unicast conversion; when the media anchoring function entity 102 and the UE 104 are multicast, the switching control function entity 01 The media anchor function entity 102 under control becomes a new multicast source, and the media stream is converted from old multicast to new multicast.

When the media stream of the content source 105 to the media anchoring function entity 102 is unicast, and the media stream between the media anchoring function entity 102 and the UE 104 is also unicast, the media anchoring function entity 102 performs the media stream. The unicast to unicast conversion is sent to the UE 104; when the media anchoring functional entity 102 and the UE 104 are also multicast, the media anchoring functional entity 102 becomes a new multicast source under the control of the handover control functional entity 101. And unicast to multicast conversion of the media stream.

After the establishment of the service connection, the media anchoring function entity 102 acts as a media control agent, and ends the media control request initiated by the UE 104, such as a real-time streaming (RTSP, Rea lTM Resizing Protoco l) control request. The media control request initiated by the UE 104 and the proxy UE 104 initiates a corresponding media control request to the content source.

6 is a flow chart of a process of performing user-side service switching in the system shown in FIG. In this process, The user side service is handed over from UE1 to UE2. As shown in Figure 6, the process includes the following steps:

Step 601: The UE1 initiates a handover request carrying the address of the UE2 to the session control function entity 103, and the session control function entity 103 routes the handover request to the handover control function entity 101.

Step 602, the handover control function entity 101 performs handover logic, and controls the functional entity through the session.

103 initiates a service establishment request, that is, a session request, to the UE2; the UE2 returns a service establishment response to the switch control function entity 101 through the control function entity 103.

Step 603, the handover control function entity 101 controls the media anchor function entity 102 to complete the media connection with the UE2 through the session control function entity 103, and copies the media stream sent to the UE1 to the UE2, that is, the media anchor function entity 102. The media stream that sends the content source 105 to the UE1 is simultaneously transmitted to the UE1 and the UE2.

Step 604: The handover control function entity 101 associates two sessions of UE1 and UE2, returns a handover response to UE1, and controls the media anchor function entity 102 to disconnect the media connection with UE1.

Through the above process, the system shown in FIG. 4 implements the service switching on the user side, and ensures the continuity of the service during the handover process.

7 is a flow chart showing the process of establishing a service connection on the content source side by the system shown in FIG. As shown in Figure 7, the following steps are included:

Step 701: The content source 105 initiates an IPTV service request carrying the content source session description information to the session control function entity 103, and the session control function entity 103 sends the IPTV service request to the switch control function entity 101.

Step 702: The handover control function entity 101 controls the media anchor function entity 102 to perform media processing by using the session control function entity 102, and converts the content source session description information into the media anchor function entity session description information, and returns to the handover control function entity. 101. The handover control function entity 101 transmits the media anchor function entity session description information to the session control function entity 102.

Step 703: The session control function entity 103 initiates an IPTV service request carrying the media anchor function entity session description information to the IPTV AS 106.

Step 704: The IPTV AS 106 receives the IPTV carrying the media anchor function entity session description information. After the service request, the user interacts with other network entities to complete the IPTV service processing, and returns a service response to the session control function entity 103. The session control function entity 103 returns the service response to the media anchor function entity 102.

Step 705: After receiving the service response, the media anchor function entity 102 sends the media anchor function entity session description information to the content source 105 to complete the service connection with the content source 105.

In the service connection established on the content source side shown in FIG. 7, the IPTV service media stream may be transmitted from the content source 105 to the media anchor function entity 102 in a unicast or multicast manner, and the media anchor function entity 102 to the UE. The transmission mode of the IPTV service media stream of the 104 may also be a unicast or multicast mode. For example, when the LTV service is used, the multicast mode is used, and the V0D service is used in the unicast mode.

When the media stream of the content source 105 to the media anchoring functional entity 102 is multicast, the media anchoring work entity 102 joins the multicast group, and the media stream between the media anchoring functional entity 102 and the UE 104 is unicast or During multicast, the media anchoring entity 102 performs multicast to unicast conversion of the media stream or old multicast to new multicast conversion of the media stream.

When the media stream of the content source 105 to the media anchoring function entity 102 is unicast, and the media stream between the media anchoring function entity 102 and the UE 104 is also unicast, the media anchoring function entity 102 bills the media stream. The broadcast to unicast is sent to the UE 104. When the media anchor function entity 102 and the UE 104 are also multicast, the media anchor function entity 102 becomes a new multicast source under the control of the handover control function entity 101. The unicast to multicast conversion of the media stream.

After establishing the service connection, for the media control request initiated by the UE 104, the media anchor function entity 102 acts as a media control agent, terminates the media control request initiated by the UE 104, and the proxy UE 104 initiates a corresponding media control request to the content source.

FIG. 8 is a flow chart of the process of the content source side service switching performed by the system shown in FIG. 4. In this process, the content source side service is switched from content source 1 to content source 2. As shown in Figure 8, the process includes the following steps:

Step 801: The content source 1 initiates a handover request carrying the address of the content source 2 to the session control function entity 103, and the session control function entity 103 routes the handover request to the handover control function entity 101. Step 802, the handover control function entity 101 executes the handover logic, and initiates a service establishment request, that is, a session request, to the content source 2 through the session control function entity 103. The content source 2 returns a service establishment response to the handover control function entity 101 through the control function entity 103.

In step 803, the handover control function entity 101 controls the media anchor function entity 102 to complete the media connection with the content source 2 through the session control function entity 103, but only forwards the media stream of the content source 1 to the UE 104.

Step 804, the handover control function entity 101 associates two sessions of the content source 1 and the content source 2, returns a handover response to the content source 1, controls the media anchor function entity 102 to disconnect the media connection with the content source 1, and forwards The media stream of content source 2 is sent to the UE 104.

Through the above process, the system shown in Figure 4 implements the service switching on the content source side and ensures the continuity of the service in the process.

The IP multimedia subsystem (IMS, IP Multimedia Subsystem) is used as a preferred embodiment to describe the handover of a typical IPTV LTV service and the handover process of a VOD service from the user side and the content source side. The switching of the content source side is described by taking the content source as the UE as an example. In the IMS system, corresponding to the session control function entity 103 in Fig. 4 is a Call Session Control Function (CSCF).

FIG. 9 is a flow chart showing the process of establishing an LTV service connection on the user side of the IMS system according to an embodiment of the present invention. As shown in 9, the following steps are included:

In step 901, the UE sends an LTV service request to the CSCF, where the LTV service request carries the identifier of the program and the session descriptor protocol (SDP, Session Descr ipt ion Protocol) information of the UE; after the CSCF performs the initial filter rule (IFC, Initial Filter Codex) processing, The LTV service request is sent to the handover control function entity.

Step 902: After receiving the LTV service request, the handover control function entity controls the media anchor function entity to perform media processing, converts the UE SDP information into the media anchor function SDP information, and returns the information to the handover control function entity through the CSCF.

Step 903: The CSCF sends an LTV service request to the IPTV AS, where the program identifier and the medium are carried. Body anchor function SDP information.

Step 904: After receiving the LTV service request, the IPTV AS interacts with other network entities to obtain information such as the multicast address MA1 and completes the LTV service processing.

Step 905: The IPTV AS returns an LTV service response to the CSCF, where the information carries the multicast address MA1 of the content source, and the CSCF returns the LTV service response to the handover control function entity.

Step 906: The handover control function entity sends the LTV service response that carries the information such as the multicast address MA1 of the content source to the media anchor function entity through the CSCF, and the media anchor function entity joins the multicast group of the content source.

Next, when the media anchoring function entity is unicast with the UE, step 907 to step 908 are performed; when the media anchoring function entity and the UE are multicast, step 909 to step 912 are performed.

Step 907: After the media anchoring function entity joins the multicast group of the content source, performs multicast to unicast conversion and media format conversion on the media stream received from the content source, for example, codec conversion: from H 264 conversion to MPEG4, resolution conversion: from 800 χ 600 to 300 χ 200, etc.; and the media anchoring function entity returns response information to the handover control function entity through the CSCF, which carries the media anchor function SDP information, and the media The anchor function DSP information includes a unicast address; the handover control function entity sends a response message to the CSCF.

Step 908: The CSCF sends an LTV service request response to the UE, where the media anchor function SDP information is carried.

So far, the LTV service establishment between the media anchoring function entity and the UE is unicast.

Step 909: The handover control function entity sends the control information and the multicast address MA2 of the media anchor function entity to the media anchor function entity through the CSCF, and controls the media anchor function entity to become a new multicast source, and the media anchor function entity pair The media stream received by the content source performs the conversion of the old multicast to the new multicast and the conversion of the media format.

Step 910: The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried, and the media anchor function SDP information includes a multicast address; the handover control function entity sends a response message to the CSCF. . Step 911: The CSCF sends an LTV service request response to the UE, where the media anchor function SDP information is carried.

Step 912: The UE joins the multicast group.

At this point, the establishment of the LTV service when the media anchoring function entity and the UE are multicast is completed. After the service establishment process shown in FIG. 9 is completed, the content source, that is, the media stream between the LTV multicast source and the media anchor function entity is multicast, and the media stream of the media anchor function entity to the UE is unicast or Multicast, as indicated by the dashed arrow in Figure 9.

FIG. 10 is a flowchart of a process of switching an LTV service from UE1 to UE2 in an IMS system according to an embodiment of the present invention. As shown in 10, the following steps are included:

Step 1001: The UE1 sends an LTV service switching request to the handover control function entity through the CSCF, where the address of the UE2 is carried.

Step 1002: The handover control function entity initiates a service establishment request to the UE2 through the CSCF.

Step 1003: The UE2 returns a service establishment request response to the handover control function entity by using the CSCF, where the SDP information of the UE2 is carried.

Step 1004: The handover control function entity sends control information to the media anchor function entity through the CSCF, where the SDP information of the UE2 is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the UE2 is converted into the media anchor function SDP information.

Step 1005: The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.

Step 1006: The handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to complete the media connection with the UE2, and simultaneously copies and distributes the media stream sent to the UE1 to the UE2, as shown in the figure. The dotted arrow in 10 is shown.

When the media anchoring function entity and the UE2 are in the multicast transmission mode, the UE2 joins the multicast group, as shown by the dotted line in FIG.

Step 1007: The handover control function entity sends handover response information to the UE1 through the CSCF.

Step 1008: UE1 returns a session end information to the handover control function entity through the CSCF, and switches The control function entity also returns handover end information to UE1.

Step 1009: The handover control function entity sends control information to the media anchor function entity through the CSCF, and controls the media anchor function entity to disconnect the media connection with the UE1. At this time, the media anchoring function entity only sends the media stream to UE2.

At this point, the LTV service switching process on the user side is completed, and the process can ensure the continuity of the service during the handover process.

Figure 11 is a flow chart showing the process of establishing a V0D service connection on the user side of the IMS system according to an embodiment of the present invention. As shown in Figure 11, the following steps are included:

Step 1101: The UE sends a VOD service request to the CSCF. The V0D service request carries the identifier of the program and the SDP information of the UE. After the CSCF performs the IFC process, the V0D service request is sent to the handover control function entity.

Step 1102: After receiving the V0D service request, the change control function entity controls the media anchor function entity to perform media processing, converts the UE SDP information into the media anchor function SDP information, and returns the information to the switch control function entity through the CSCF.

Step 1103: The CSCF sends a VOD service request to the IPTV AS, where the program identifier and the media anchor function SDP are carried.

Step 1104: After receiving the V0D service request, the IPTV AS interacts with other network entities to perform media resource scheduling, obtains information such as the media server address, and completes V0D service processing.

Step 1105: The IPTV AS returns a VOD service response to the CSCF, where the SDP information of the media server is carried, and the CSCF returns the VOD service response to the handover control function entity.

Step 1106: The handover control function entity sends the V0D service response to the media anchor function entity through the CSCF.

Next, when the media anchor function entity is unicast with the UE, step 1107 to step 1108 are performed; when the media anchor function entity and the UE are multicast, step 11 09 to step 1 112 are performed.

Step 1107: After receiving the V0D service response, the media anchoring function entity performs unicast to unicast conversion and media format conversion on the media stream received from the content source, and performs handover control through the CSCF. The function entity returns response information, where the media anchor function SDP information is carried, and the SDP information includes a unicast address; the handover control function entity sends the response information to the CSCF.

Step 1108: The CSCF sends a VOD service request response to the UE, where the media anchor function SDP information is carried.

So far, the V0D service establishment between the media anchoring function entity and the UE is unicast. Step 1109: The handover control function entity sends the control information and the multicast address of the media anchor function entity to the media anchor function entity through the CSCF, and controls the media anchor function entity to become a new multicast source, and the media anchor function entity pairs the slave content. The media stream received by the source is converted from unicast to multicast and converted in media format.

Step 1110: The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried, and the SDP information includes a multicast address; the handover control function entity sends the response information to the CSCF.

Step 1111: The CSCF sends a VOD service request response to the UE, where the media anchor function SDP information is carried.

Step 1112: The UE joins the multicast group.

At this point, the establishment of the V0D service when the media anchoring function entity and the UE are multicast is completed. After the service establishment process shown in FIG. 11 is completed, the media stream between the content source, that is, the VOD service media server and the media anchor function entity is unicast, and the media flow between the media anchor function entity and the UE is unicast or Multicast, as indicated by the dashed arrow in Figure 11.

In FIG. 11, a flow chart of the media anchoring function entity interacting with the content source and performing media control during the service progress process is also provided, and the following steps are performed: Step 111 3: UE to the media The anchor function entity initiates an RTSP control request, and the media anchor function control entity forwards the RTSP control request to the VOD service media server.

Step 1114: The VOD service media server returns an RTSP control request response message to the media anchor control function entity, and the media anchor control function entity forwards the RTSP control request response message to the UE.

12 is a process flow of a VOD service switched from UE1 to UE2 in an IMS system according to an embodiment of the present invention. Figure. As shown in Figure 1, the following steps are included:

Step 1201: The UE1 sends a VOD service switching request to the handover control function entity by using the CSCF, where the UE1 carries the address, the breakpoint information, the program identifier, and the like information of the UE2.

Step 1202: The handover control function entity initiates a service establishment request to the UE2 through the CSCF.

Step 1203: The UE2 returns a service establishment request response to the handover control function entity by using the CSCF, where the SDP information of the UE2 is carried.

Step 1204: The handover control function entity sends control information to the media anchor function entity through the CSCF, where the breakpoint information is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the UE2 is converted into the media anchor function SDP information.

Step 1205: The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.

Step 1206: The handover control function entity sends control information to the media anchor function entity through the CSCF, and controls the media anchor function entity to complete the media connection with the UE2.

When the media anchoring function entity and the UE2 are in the multicast transmission mode, in step 1206, the UE2 joins the multicast group, as shown by the dotted line in FIG.

Step 1207: The media anchoring function entity sends an RTSP control request that starts playing from the breakpoint to the V0D service media server, and simultaneously sends the media stream sent by the VOD service media server to UE1 and UE2, as indicated by the dotted arrow in FIG.

Step 1208: The handover control function entity sends handover response information to the UE1 through the CSCF.

Step 1209: The UE1 returns the session end information to the handover control function entity through the CSCF, and the handover control function entity also returns the handover end information to the UE1.

Step 121 0: The handover control function entity sends control information to the media anchor function entity through the CSCF, and controls the media anchor function entity to disconnect the media connection with the UE1. At this time, the media anchoring function entity only sends the media stream to UE2.

At this point, the V0D service switching process on the user side is completed, and the process can ensure the continuity of the service in the handover process. FIG. 13 is a flowchart of a process for establishing an LTV service connection on an content source side of an IMS system according to an embodiment of the present invention. As shown in Figure 13, the following steps are included:

Step 1301: The content source sends an LTV service upload request to the CSCF, where the SDP information and content metadata of the content source are carried. The CSCF performs the IFC process and sends the LTV service upload request to the handover control function entity.

Step 1302: After receiving the LTV service upload request, the handover control function entity controls the media anchor function entity to perform media processing, converts the SDP information of the content source into the media anchor function SDP information, and returns the switch control function through the CSCF. entity.

Step 1303: The CSCF sends an LTV service upload request to the IPTV AS, where the content metadata and the media anchor function SDP information are carried.

Step 1304: After receiving the LTV service upload request, the IPTV AS interacts with other network entities to complete the LTV service processing.

The LTV service processing in this step includes: querying user content upload authority, obtaining program identifier, obtaining multicast address, delivering content metadata, program identification, and performing data organization of an electronic program guide (EPG).

Step 1305: The IPTV AS saves the program identifier and the multicast address, and returns the program identifier and the multicast address to the handover control function entity through the CSCF.

Step 1306, the handover control function entity sends the program identification and the multicast address to the media anchor function entity through the CSCF.

Step 1307: When the media stream of the content source to the media anchoring function entity is in a multicast propagation mode, the media anchoring function entity joins the multicast group, and performs multicast to multicast conversion and media format conversion of the media stream. Otherwise, when the media stream of the content source to the media anchoring function entity is in the unicast propagation mode, the media anchoring function entity performs unicast-to-multicast conversion and media format conversion on the media stream. Then, the media anchoring function entity returns the media anchoring function SDP information and the program identifier to the handover control function entity through the CSCF, and the handover control function entity sends the media anchoring function SDP information and the program identifier to the CSCF. Step 1 308: The CSCF sends an LTV service upload request response to the content source, where the media anchor function SDP information and the program identifier are carried.

At this point, the establishment of the LTV service on the content source side is completed.

After the service establishment process shown in FIG. 13 is completed, the media stream between the content source and the media anchor function entity is unicast or multicast, and the media stream of the media anchor function entity to the UE is multicast, as shown in the figure. The dotted arrow in 1 3 is shown.

Figure 14 is a flow chart showing the process of switching the LTV service from the content source 1 to the content source 2 in the IMS system according to the embodiment of the present invention. As shown in Figure 14, the following steps are included:

Step 1401: The content source 1 sends an LTV service switching request to the handover control function entity through the CSCF, where the address URL of the content source 2 and the program identifier are carried.

Step 1402: The handover control function entity initiates a service establishment request to the content source 2 through the CSCF. Step 1403: The content source 2 returns a service establishment request response to the handover control function entity by using the CSCF, where the SDP information of the content source 2 is carried.

Step 1404: The handover control function entity sends control information to the media anchor function entity through the CSCF, where the SDP information of the content source 2 is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the content source 2 is converted into a media anchor. Function SDP information.

Step 1405: The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.

Step 1406, the handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to complete the media connection with the content source 2, and the media anchor function entity simultaneously receives the media stream 1 of the content source 1 And the media stream 2 of the content source 2, and only the media stream 1 of the content source 1 is forwarded to the UE.

Step 1407: The handover control function entity sends the handover response information to the content source 1 through the CSCF. Step 1408: The content source 1 returns the session end information to the handover control function entity through the CSCF, and the handover control function entity also returns the handover end information to the content source 1.

Step 1409, the handover control function entity sends a control letter to the media anchor function entity through the CSCF. And control the media anchoring function entity to disconnect the media connection with the content source 1, and forward the media stream 2 of the content source 2 to the UE.

At this point, the LTV service switching process on the content source side is completed, and the process can ensure the continuity of the service during the handover process.

In practice, the content source may be a media server or a UE. When the UE provides the media content, that is, the media stream, as the content source of the VOD service, the UE has the following two transmission modes:

1) The content source UE initiates a VOD service upload request to the IPTV AS, and the IPTV AS specifies a media server for storing the media content; the media content of the content source UE is processed by the media anchor function entity and uploaded to the media server; When the V0D service requests, the media content is provided by the media server.

2) The content source UE only publishes its content information, but does not publish its media content to the server on the network side, and the media content is stored locally in the content source UE; when other UEs initiate the VOD service request, the IPTV AS points the VOD service request to the media anchor. The function entity, the media anchor function entity requests the corresponding media content from the content source UE.

The establishment process and handover process of the VOD service in the case of mode 2) will be described below.

FIG. 15 is a flow chart showing the process of establishing a V0D service connection on the content source side of the IMS system according to an embodiment of the present invention. As shown in Figure 15, the following steps are included:

Step 1501: The content source sends a VOD service upload request to the handover control function entity by using the CSCF, where the SDP information, content metadata, and the like of the content source are carried.

Step 1502: After receiving the VOD service upload request, the handover control function entity controls the media anchor function entity to perform media processing, converts the SDP information of the content source into the media anchor function SDP information, and returns the switch control function through the CSCF. entity.

Step 1503: The CSCF sends a VOD service upload request to the IPTV AS, where the content metadata and the media anchor function SDP information are carried.

Step 1504: After receiving the VOD service upload request, the IPTV AS interacts with other network entities to complete the V0D service processing. The VOD service processing in this step includes: querying user content upload authority, obtaining program identifier, delivering content metadata, program identifier, and performing data organization of an electronic program list (EPG, E lec ronic ic Programme Gu ide).

Step 1505: The IPTV AS returns a V0D service upload request response message to the handover control function entity through the CSCF.

Step 1506: The handover control function entity sends the VOD service upload request response information to the media anchor function entity through the CSCF.

Step 1507: The media anchoring function entity multicasts the media stream to the multicast, unicast to multicast, and the media stream according to the content source to the media anchoring functional entity, and the media anchoring function media to the UE. Broadcast to unicast or multicast to unicast conversion and media format conversion. Then, the media anchoring function entity media anchoring function entity returns a response message to the switching control function entity through the CSCF, where the media anchoring function SDP information is carried, and the switching control function entity sends the response information to the CSCF.

Step 1508, the CSCF sends a response message to the content source.

At this point, the establishment of the V0D service on the content source side is completed.

After the service establishment process shown in FIG. 15 is completed, the media stream between the content source and the media anchor function entity is unicast or multicast, and the media stream of the media anchor function entity to the UE is unicast or multicast. , as shown by the dashed arrow in Figure 15.

Figure 16 is a flow chart showing the process of switching the VOD service from the content source 1 to the content source 2 in the IMS system according to the embodiment of the present invention. As shown in 16, the following steps are included:

Step 1601: The content source 1 sends a V0D service switching request to the handover control function entity through the CSCF, where the content of the content source 2, the breakpoint information, the program identifier, and the like are carried.

Step 1602: The handover control function entity initiates a service establishment request to the content source 2 through the CSCF, where the breakpoint information and the program identifier are carried.

In step 1603, the content source 2 returns a service establishment request response to the handover control function entity through the CSCF, where the SDP information of the content source 2 is carried. Step 1604: The handover control function entity sends control information to the media anchor function entity through the CSCF, where the SDP information of the content source 2 is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the content source 2 is converted into media anchoring. Function SDP information.

Step 1605: The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.

Step 1606, the handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to complete the media connection with the content source 2, and the media anchor function entity simultaneously receives the media stream 1 of the content source 1 And the media stream 2 uploaded by the content source 2 from the breakpoint, and only the media stream of the content source 1 is forwarded to the user.

Step 1607: The handover control function entity sends the handover response information to the content source 1 through the CSCF. Step 1608: The content source 1 returns the session end information to the handover control function entity through the CSCF, and the handover control function entity also returns the handover end information to the content source 1.

Step 1609: The handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to disconnect the media connection with the content source 1, and forwards the media stream 2 of the content source 2 to the user.

At this point, the V0D service switching process on the content source side is completed, which ensures the continuity of the service during the handover process.

Next, a structural block diagram of the switching control function entity introduced in FIG. 2 is given. FIG. 17 is a structural block diagram of an apparatus for implementing a switching control function according to an embodiment of the present invention. As shown in FIG. 17, a device for implementing a switching control function is shown in FIG. The 1701 includes: a media control module 1702 and a switching control module 1703.

In FIG. 17, the media control module 1702 is configured to receive a service request, send media control information to the UE and/or the streaming media content delivery entity, send the processed service request to the IPTV AS, and receive the media control sent by the IPTV AS. The information is processed and sent to the streaming media content delivery entity and/or the UE. The handover control module 1703 is configured to receive the handover request sent by the handover initiation entity, and send the message to the UE and/or the streaming media content delivery entity: first establishing and switching Accepting the media connection between the entities, simultaneously sending the media stream to the handover originating entity and the handover accepting entity or simultaneously transmitting the entity from the handover The media stream selected by the entity is selected to be forwarded to the UE, and then the handover control information of the media connection with the handover originating entity is cut off.

The structural block diagram of the media anchoring function entity introduced in FIG. 3 is given below. FIG. 18 is a structural block diagram of an apparatus for implementing the media anchoring function according to an embodiment of the present invention. As shown in FIG. 18, a media anchoring function is implemented. The device 1801 includes: an instruction receiving module 1 802, a media stream transceiver module 1803, and a media control requesting proxy module 1805, and the media stream transceiver module includes a media stream processing module 1804.

In FIG. 18, the media stream transceiver module 1803 receives the media stream sent by the content source, and the media stream processing module 1804 unicasts the media stream received by the media stream transceiver module 1803 to multicast, or unicasts to unicast. After the multicast to unicast, or multicast to multicast conversion and media format conversion, the media stream transceiver module 18 G 3 sends the media stream processed by the media stream processing module 18 G4 to the UE. The instruction receiving module 1802 is configured to receive external media control information during the establishment of the network television service, and control the media stream transceiver module 1803 to process the media stream; when the network television service is switched, receive external switching control information, and control The media stream transceiver module 1803 first establishes a media connection with the handover accepting entity, and simultaneously sends the media stream to the handover initiating entity and the handover accepting entity or forwards the media stream selection received from the handover sending entity and the receiving entity to the UE, and then Cut off the media connection with the switching originating entity. The media control request proxy module 1805 is configured to receive a media control request sent by the UE, and forward the media control request to the content source.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included. It is within the scope of the invention.

Claims

Claim

A method for switching, characterized in that the method comprises:

2. The method of switching according to claim 1, wherein before the switching method, the method further includes:

Receiving a service request of the handover originating entity;

Sending a service request to the IPTVAS;

Receiving service response information returned by the IPTVAS;

The handover originating entity establishes a media connection with the streaming media content delivery entity and/or the user equipment.

The method of switching according to claim 2, further comprising: before sending the service request to the IPTV AS, the method further comprising:

Forwarding the received service request to the streaming content delivery entity and/or the user device;

Receiving response information sent by the streaming media content delivery entity and/or the user device.

4. The method of switching according to claim 1 or 2 or 3, characterized in that

The streaming media content delivery entity includes: a content source and/or a media anchoring functional entity;

The handover initiation entity and the handover accepting entity are content sources or UEs;

The content source is a UE or a media server.

The method of handover according to claim 1, wherein the method is applied to a handover control function entity or to an IPTV AS.

6. A device for implementing a switching function, comprising:

a handover control module, configured to receive a service switching request sent by the handover initiation entity, and send handover control information to the UE and/or the streaming media content delivery entity, where the handover control information controls the streaming media content The delivery entity or user equipment first establishes a media connection with the handover accepting entity and then disconnects the media connection with the handover originating entity.

The apparatus for implementing the handover function according to claim 6, further comprising: a media control module, configured to receive a service request of the handover initiation entity, and send the media control information to the UE and/or the streaming media content delivery entity; Sending the service request to the IPTV AS, receiving the service response information returned by the IPTV AS, and controlling the streaming media content delivery entity and/or the user equipment to establish a media connection with the handover initiation entity.

The apparatus for implementing a handover function according to claim 6 or 7, wherein the streaming media content delivery entity comprises: a content source and/or a media anchoring function entity;

The content source is a UE or a media server.

9. A method of media anchoring, characterized in that the method comprises:

The media anchoring method according to claim 9, wherein before the switching method, the method further includes:

The media anchoring function entity receives the media control information;

The media anchoring function entity establishes a media connection with the handover originating entity.

11. The method of media anchoring according to claim 9 or 10, characterized in that

The handover initiation entity and the handover accepting entity are both UEs or content sources at the same time; the content source is a UE or a media server.

12. The method of media anchoring of claim 11 wherein:

When the handover initiation entity and the handover accepting entity are content sources, the method is specifically: the media anchoring functional entity, and receiving the media source of the handover initiation entity content source and the handover acceptance entity content source, but only the handover initiation entity The media stream is forwarded to the UE; then the media anchoring function entity is cut off The media connection with the handover initiating entity forwards the media stream of the handover accepting entity to the UE; when the handover initiation entity and the handover accepting entity are UEs, the method is specifically: the media anchor function entity first establishes and switches acceptance The media connection between the entity UEs, the media stream sent by the content source is simultaneously copied and sent to the handover initiation entity UE and the handover accepting entity UE; then the media anchor function entity cuts off the media connection with the handover initiation entity UE.

The media anchoring method according to claim 9, wherein the media control information and the handover control information are sent by the handover control function entity or by the IPTV AS to the media anchor function entity.

The method for media anchoring according to claim 13, wherein the media control information and the handover control information sent by the handover control function entity to the media anchor function entity are directly sent to the media anchor function entity. Or forwarded to the media anchoring functional entity through the session control function entity.

The media anchoring method of claim 10, wherein the media anchoring function entity establishes a media connection with the handover initiation entity further comprises: the media anchoring function entity performing a single on the media stream received from the content source Broadcast to multicast, or unicast to unicast, or multicast to unicast, or multicast to multicast conversion, and then sent to the handover initiator.

The media anchoring method according to claim 9, wherein the method further comprises: the media anchoring function entity receiving the media control request sent by the handover initiation entity or the handover receiving entity, and forwarding the media control request to Content source.

17. The media anchoring method of claim 10, wherein the media anchoring functional entity establishing a media connection with the handover initiation entity further comprises: the media anchoring functional entity mediating the media stream received from the content source After the format is converted, it is sent to the UE.

The media anchoring method according to claim 9 or 10, wherein when the media stream propagation mode of the content source to the media anchoring function entity is multicast, the method further comprises: a media anchoring functional entity Join a multicast group.

19. An apparatus for implementing a media anchoring function, comprising: The media stream transceiver module is configured to receive the media stream sent by the content source, and forward the media stream to the UE; and the command receiving module is configured to receive the switch control information when the network television service is switched, and control the media stream transceiver module to first establish and The switch accepts the media connection between the entities, and then cuts off the media connection between the media stream transceiver module and the handover originating entity.

The apparatus for implementing a media anchoring function according to claim 19, wherein the command receiving module is further configured to receive media control information, and control the media stream transceiver module to process the media stream.

The apparatus for implementing a media anchoring function according to claim 19, wherein the media stream transceiver module comprises a media stream processing module, configured to unicast the media stream received by the media stream transceiver module into a group. Broadcast, or unicast to unicast, or multicast to unicast, or multicast to multicast conversion and media format conversion; the media stream transceiver module sends the media stream processed by the media stream processing module to the UE.

The apparatus for implementing a media anchoring function according to claim 19, further comprising: a media control request proxy module, configured to receive a media control request sent by the UE, and forward the media control request to the content source.

23. A system for implementing network television service switching, characterized by:

a media anchoring function entity, configured to forward the media stream of the content source to the UE, and after receiving the handover control information, first establish a media connection with the handover accepting entity, and then cut off the media connection with the handover initiation entity. .

The system for implementing network television service switching according to claim 23, further comprising: a handover control function entity, configured to send handover control information to the media anchor function entity.

The system for implementing network television service switching according to claim 24, wherein the handover control function entity is further configured to send media control information for media processing to the media anchoring function entity;

After receiving the media control information, the media anchoring function entity is further used for performing media processing.

26. The system for implementing network television service switching according to claim 23, wherein: The handover initiation entity and the handover accepting entity are UEs or content sources;

The content source is a UE or a media server.

27. A system for implementing network television service switching, characterized by:

a handover control function entity, configured to: after receiving the handover request, send handover control information; the handover control information controls the streaming media content delivery entity or the user equipment to establish a media connection with the handover accepting entity, and then disconnects from the handover initiation entity Media connection between.

The system for implementing network television service switching according to claim 27, further comprising: a media anchoring function entity, configured to forward the media stream of the content source to the UE, and receive the handover control function entity After switching the control information, a media connection with the handover accepting entity is established, and then the media connection with the handover originating entity is cut off.

The system for implementing network television service switching according to claim 28, wherein the streaming media content delivery entity comprises: a content source and/or a media anchoring function entity; the handover initiation entity and the handover accepting entity Is the content source or UE;

The content source is a UE or a media server.

30. A method for implementing network television service switching, which is characterized by:

A. The handover control function entity sends media control information to the media anchor function entity, and the media anchor function entity receives the media stream sent by the content source and forwards the message to the UE under the control of the media control information;

The method for implementing the switching of the network television service according to claim 30, further comprising: before the step B, further comprising:

The handover initiating entity sends a service switching request to the handover control function entity through the session control function entity; The handover control function entity sends a service establishment request to the handover accepting entity through the session control function entity; the handover accepting entity returns a service establishment request response to the handover control function entity through the session control function entity;

The handover control entity sends media control information for media processing to the media anchor function entity; the media anchor function entity performs media processing and returns response information to the handover control function entity;

Before the disconnecting the media connection between the initiating entity and the handover initiating entity in the step B, the handover control function entity sends the service switching request response information to the handover initiating entity through the session control function entity; the handover initiating entity controls the function entity through the session, Returns the session end information to the handover control function entity.

The method for implementing network TV service switching according to claim 30 or 31, wherein the media control information and the handover control information sent by the handover control function entity to the media anchor function entity are directly sent to the media anchor. The functional entity is forwarded to the media anchoring functional entity via the session control function entity.

33. A method of implementing network television service switching as claimed in claim 30 or 31, characterized in that

The handover initiation entity and the handover accepting entity are UEs or content sources, and the content source is a UE or a media server.

The method for implementing the handover of the network television service according to claim 33, wherein, when the handover initiation entity and the handover accepting entity are UEs, and the service handover request is an LTV service handover request, The media anchoring function entity sends the media stream to the handover initiation entity and the handover accepting entity at the same time. The media anchor function entity sends the media stream received from the content source to the handover initiation entity UE, and the replication is sent to the handover accepting entity. UE.

The method for implementing the handover of the network television service according to claim 33, wherein, when the handover initiation entity and the handover accepting entity are UEs, and the service handover request is a VOD service handover request,

The service sent by the handover initiation entity to the handover control entity through the session control function entity The switch request contains breakpoint information;

The media control information for media processing sent by the handover control entity to the media anchoring function entity includes breakpoint information;

In step B, the media anchoring function entity simultaneously sends the media stream to the handover initiating entity and the handover accepting entity or includes: the media anchoring function entity sends a real-time streaming media transmission request that starts playing from the breakpoint to the content source; media anchoring The function entity sends the media stream received from the content source to the handover initiation entity UE, and the replication is sent to the handover accepting entity UE.

The method for implementing the handover of the network television service according to claim 33, wherein, when the handover initiation entity and the handover accepting entity are content sources, and the service handover request is an LTV service handover request,

In step B, the media anchoring function entity forwards the media stream selection received from the handover sending entity and the receiving entity to the UE at the same time. The media anchoring function entity receives the media stream sent by the switching originating entity content source and receives the switching. Receiving the media stream sent by the entity content source, but only forwarding the media stream sent by the switching originating entity content source to the UE; after the disconnecting the media connection between the switching originating entity, the method comprises: switching the medium sent by the receiving entity content source The flow is forwarded to the UE.

The method for implementing the handover of the network television service according to claim 33, wherein when the handover initiation entity and the handover accepting entity are content sources, and the service handover request is a VOD service handover request,

The handover initiating entity includes the breakpoint information in the service switching request sent by the handover control entity by using the session control function entity;

The service establishment request sent by the handover control function entity to the handover accepting entity includes breakpoint information;

In step B, the media anchoring function entity forwards the media stream selection received from the handover sending entity and the receiving entity to the UE at the same time. The media anchoring function entity receives the media stream sent by the content source of the handover initiation entity, and receives the media stream. Switching accepts the media stream sent by the entity content source from the breakpoint, but only forwards the media stream sent by the switching originating entity content source to the UE; After the media connection between the initiating entities is changed, the media stream sent by the handover receiving entity content source is forwarded to the UE.

38. The method for implementing network television service switching according to claim 33, wherein before step A, the method further comprises the following steps:

a handover initiation entity sends a service request including the handover initiation entity session description information to the handover control function entity through the session control function entity;

b. The handover control function entity controls the media anchor function entity to perform media processing, and converts the handover initiation entity session description information into the media anchor function entity session description information;

c. The session control function entity sends a service request including the media anchor function entity session description information to the network television application server IPTV AS; the IPTV AS completes the service processing;

d. The media anchoring function entity sends a service request response to the handover originating entity, where the media anchor function entity session description information is included.

The method for implementing network television service handover according to claim 38, wherein when the handover initiation entity is a UE, and the media stream propagation mode between the media anchoring function entity and the handover initiation entity UE is a single When broadcasting, the service request response in step d includes a unicast address;

When the handover initiation entity is a UE, and the media stream propagation mode between the media anchoring function entity and the handover initiation entity UE is multicast, before step d, the method further includes: the handover control function entity passes the session control function entity, The media anchoring function entity sends the control information including the multicast address, and controls the media anchoring function entity to become the multicast source. The service request response includes the multicast address in the step d. After the step d, the method further includes: switching the receiving entity UE Join a multicast group.