CN101267537A

CN101267537A - Method and system for switching network TV service

Info

Publication number: CN101267537A
Application number: CN200710087340.2A
Authority: CN
Inventors: 王丰; 彭招君; 严军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-03-14
Filing date: 2007-03-14
Publication date: 2008-09-17
Also published as: WO2008110094A1

Abstract

The embodiment of the invention discloses a method and a system for network television service switch. After introducing a switch control entity and/or a media anchoring entity to a network television system, by controlling, the media connection of a switch accepting entity is established first, and then the media connection of a switch initiating entity is cut off, thus the switch of a network television service from the switch initiating entity to the switch accepting entity is realized, and the continuity of the network television service in switch process is guaranteed.

Description

Realize the method and system that network TV business switches

Technical field

The present invention relates to the Web TV technical field, refer to method and system and a kind of device and a kind of device of realizing switching control function of realizing medium grappling function of realizing that network TV business switches especially.

Background technology

Web TV (IPTV) is based on that broadband network carries out, based on the business of Streaming Media.Compare with traditional television services, Web TV provides abundant more professional flexibly and comprehensive network television incremental value service platform, comprises business tines such as communication, data, video, audio frequency.

At present, network TV business mainly is divided into by its circulation way: professional and video request program (VOD, the Video on demand) business of live telecast (LTV, Linear TV).The VOD program adopts mode of unicast to transmit.The LTV program adopts the multicast mode to transmit.

Fig. 1 is the structural representation of network television system in the prior art.As shown in Figure 1, existing network television system generally comprises: content source, user equipment (UE), conversation control function entity, Web TV application server IPTV AS and some and IPTV AS have other mutual network entities.Wherein, content source is used for providing to UE the content of IPTV business; UE is the equipment that the user receives the IPTV business; Conversation control function entity is used to carry out session control, management and route etc.; IPTV AS is the application server of process IP TV service request logic.

The network TV business switching is meant in the multiple different access technologies of supporting the IPTV business, and stride switching characteristic between the different access technologies, its essence is the change of the media channel that causes because of the variation of access link, can be divided into the switching of user side and the switching of content source.In the process that network TV business switches, need to keep not interrupting continuously of ongoing session control and user's face Media Stream, promptly guarantee the continuity of IPTV business.

But do not provide the technical scheme that realizes that network TV business switches in the prior art.

Summary of the invention

In view of this, the embodiment of the invention provides a kind of method that realizes that network TV business switches, and this method has realized the switching of network TV business, and has guaranteed the continuity of network TV business in handoff procedure.

The embodiment of the invention also provides a kind of method that realizes that network TV business switches, and this method has realized the switching of network TV business, and has guaranteed the continuity of network TV business in handoff procedure.

The embodiment of the invention also provides a kind of system that realizes that network TV business switches, and this system has realized the switching of network TV business, and has guaranteed the continuity of network TV business in handoff procedure.

The embodiment of the invention provides a kind of method that realizes that network TV business switches again, and this method has realized the switching of network TV business, and has guaranteed the continuity of network TV business in handoff procedure.

The embodiment of the invention provides a kind of device of realizing medium grappling function, and this device has been realized the switching of network TV business, and has guaranteed the continuity of network TV business in handoff procedure.

The embodiment of the invention provides a kind of device of realizing switching control function, and this device has been realized the switching of network TV business, and has guaranteed the continuity of network TV business in handoff procedure.

For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that

The embodiment of the invention discloses a kind of method that realizes that network TV business switches, this method comprises:

Set up in the process in business, after the switching control function entity receives service request, pay entity and/or user equipment (UE) transmission media control information to streaming medium content, service request after handling is sent to IPTV AS, and receive the media control information that Web TV application server IPTV AS sends, send to streaming medium content after handling and pay entity and/or UE;

In handoff procedure, switch and initiate entity to switching control function entity transmission network TV business handoff request; The switching control function entity sends switching control information to streaming medium content payment entity or UE, and the control flows media content pays entity or the foundation of UE elder generation is connected with the medium that switching is accepted between the entity, cuts off then with the medium that switch between the initiation entity to be connected.

Medium grappling functional entity under the control of media control information, the Media Stream that the received content source sends, and Media Stream is transmitted to UE;

Medium grappling functional entity is under the control of switching control information, setting up the medium of accepting between the entity with switching earlier is connected, simultaneously initiate entity and switch to accept entity and send Media Stream or will be simultaneously be connected from switching sending entity and accept the Media Stream that entity receives and select to be transmitted to UE, cutting off then with the medium that switch between the initiation entity to switching.

The embodiment of the invention also discloses a kind of system that realizes that network TV business switches, this system comprises:

The switching control function entity is used for sending switching control information to medium grappling functional entity;

Medium grappling functional entity, be used for the Media Stream of content source is transmitted to UE, and behind the switching control information that receives the switching control function entity, setting up the medium of accepting between the entity with switching is connected, simultaneously to switch initiate entity and switch accept entity send Media Stream or will be simultaneously from switching sending entity and accept the Media Stream that entity receives and select to be transmitted to UE, and cut off with the medium that switch between the initiation entity and be connected.

The embodiment of the invention discloses a kind of method that realizes that network TV business switches again, and this method comprises:

A, switching control function entity send media control information to medium grappling functional entity, and medium grappling functional entity is under the control of described media control information, and the Media Stream that the received content source sends also is transmitted to UE;

B, switching control function entity send switching control information to medium grappling functional entity, medium grappling functional entity is under the control of described switching control information, setting up the medium of accepting between the entity with switching earlier is connected, simultaneously initiate entity and switch to accept entity and send Media Stream or will be simultaneously be connected from switching sending entity and accept the Media Stream that entity receives and select to be transmitted to UE, cutting off then with the medium that switch between the initiation entity to switching.

The embodiment of the invention discloses a kind of device of realizing medium grappling function, this device comprises:

The Media Stream transceiver module is used for the Media Stream that the received content source sends, and Media Stream is transmitted to UE;

Instruction control module is used for setting up the control information of process receiving media at network TV business, and control Media Stream transceiver module is handled Media Stream; Be used for when network TV business switches, receive switching control information, and the foundation earlier of control Media Stream transceiver module is connected with the medium that switching is accepted between the entity, simultaneously initiate entity and switch to accept entity and send Media Stream or will be simultaneously be connected from switching sending entity and accept the Media Stream that entity receives and select to be transmitted to UE, cutting off then with the medium that switch between the initiation entity to switching.

The embodiment of the invention discloses a kind of device of realizing switching control function, this device comprises:

Media management module, be used for after receiving service request, paying entity transmission media control information to UE and/or streaming medium content, service request after handling is sent to IPTV AS, and receive the media control information that IPTV AS sends, send to streaming medium content after handling and pay entity and/or UE;

The switching controls module, be used to receive switch and initiate the handoff request that entity sends, and pay entity to UE and/or streaming medium content and send: set up the medium of accepting between the entity with switching earlier and be connected, simultaneously to switch initiate entity and switch accept entity send Media Stream or will be simultaneously from switching sending entity and accepting the Media Stream that entity receives and select to be transmitted to UE, cut off the switching control information that is connected with the medium that switch between the initiation entity then.

By technique scheme, as seen the embodiment of the invention is introduced switching control function entity and/or medium grappling functional entity in network television system, and by control, after the medium company that accepts entity is switched in first foundation, cut off the scheme of switching the medium connection of initiating entity again, realized that network TV business accepts the switching of entity from switch initiating entity to switching, and guaranteed the continuity of network TV business in handoff procedure.

Description of drawings

Fig. 1 is the structural representation of network television system in the prior art;

Fig. 2 is a kind of method schematic diagram of realizing that network TV business switches of the embodiment of the invention;

Fig. 3 is a kind of method schematic diagram of realizing that network TV business switches of further embodiment of this invention;

Fig. 4 is a kind of structured flowchart of realizing the system that network TV business switches of the embodiment of the invention;

Fig. 5 is that system shown in Figure 4 sets up the professional process flow diagram that connects at user side;

Fig. 6 is that system shown in Figure 4 carries out the professional process flow diagram that switches of user side;

Fig. 7 is that system shown in Figure 4 sets up the professional process flow diagram that connects at the content source;

Fig. 8 is that system shown in Figure 4 carries out the process flow diagram that the content source side business switches;

Fig. 9 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of LTV at user side;

Figure 10 is the process flow diagram that the LTV business switches to UE2 in the embodiment of the invention IMS system from UE1;

Figure 11 is that embodiment of the invention IMS system sets up the process flow diagram that industry VOD affair connects at user side;

Figure 12 is the process flow diagram that the VOD business switches to UE2 in the embodiment of the invention IMS system from UE1;

Figure 13 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of LTV at the content source;

Figure 14 is the process flow diagram that the LTV business switches to content source 2 in the embodiment of the invention IMS system from content source 1;

Figure 15 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of VOD at the content source;

Figure 16 is the process flow diagram that the VOD business switches to content source 2 in the embodiment of the invention IMS system from content source 1;

Figure 17 is a kind of structured flowchart of realizing the device of switching control function of the embodiment of the invention;

Figure 18 is a kind of structured flowchart of realizing the device of medium grappling function of the embodiment of the invention.

Embodiment

The embodiment of the invention is in network television system, introduce the switching control function entity, be intended to replace IPTV AS to take over the payment of streaming medium content is controlled, promptly under the situation that need not IPTV AS participation, finish the switching of network TV business, comprise the switching of user side and the switching of content source.

In the application's embodiment, network TV business switches to switch and accepts entity from switch initiating entity, for example, when network TV business when UE1 switches to UE2, UE1 initiates entity for switching, UE2 accepts entity for switching; When network TV business when content source 1 switches to content source 2, content source 1 is initiated entity for switching, content source 2 is accepted entity for switching.

Fig. 2 is a kind of method schematic diagram of realizing that network TV business switches of the embodiment of the invention.As shown in Figure 2, this method has been introduced the switching control function entity in existing network television system.Wherein, streaming medium content is paid entity and is comprised that content source and Media Stream arrive the entity that may pass through before the UE, and as the following medium grappling functional entity that will mention, and content source can be UE or the media server that media content is provided to the user.

Set up in the process in initial business, after the switching control function entity obtains the professional information of setting up, take over the function of medium control, be that IPTV AS sends to UE and streaming medium content and pays the control information of entity and be switched the controlled function entity and receive, and re-send to UE after treatment and streaming medium content is paid entity.

In service switch process, the switching control function entity receives handoff request, pay entity and/or UE transmission switching control information to streaming medium content, control flows media content payment entity and UE finish the network TV business of accepting entity to switching from switching initiation entity and switch.

In network TV business, if IPTV AS has new control to media delivery, then control information still is switched the intercepting and capturing of controlled function entity, is finished the medium control of streaming medium content being paid entity and UE by the switching control function entity.

In the network television system that provides in the embodiment shown in fig. 1, may there be a plurality of IPTV AS that finish different business.Therefore, need each IPTV AS all to support handoff functionality, when the network TV business that carries out user side or content source switches, finish relevant service switch process.But this mode of operation inefficiency.And in the method embodiment illustrated in fig. 2, handoff request is sent to the switching control function entity, by switching control function entity control whole service handoff procedure, and IPTV AS has been shielded service switch process, has improved operating efficiency.

Another embodiment of the present invention is introduced medium grappling functional entity in network television system, be used for the Media Stream that the received content source sends, and Media Stream is transmitted to UE; Medium grappling functional entity is set up the medium of accepting between the entity with switching earlier and is connected under the control of the switching control information that receives, and cuts off the medium of initiating between the entity with switching then and is connected.

Fig. 3 is a kind of method schematic diagram of realizing that network TV business switches of further embodiment of this invention.As shown in Figure 3, this method has been introduced medium grappling functional entity in existing network television system.

Set up in the process in initial business, medium grappling functional entity is under the control of control command, to self insert between content source and the UE, making the Media Stream that directly transmits between content source and UE originally change into by medium grappling functional entity transmits, be that medium grappling functional entity receives the Media Stream from content source, be transmitted to UE again.Control command can be from IPTV AS, also can be from the switching control function entity, and prerequisite is to have introduced the switching control function entity in network television system.

Business is set up process and may be related to medium grappling functional entity the Media Stream from the content source to UE is carried out conversion between unicast-multicast, clean culture-clean culture, multicast-multicast, the multicast-clean culture.When the Media Stream circulation way of medium grappling functional entity was multicast, medium grappling functional entity had multicast and adds ability, thereby can join the multicast group of content source in content source.Medium grappling functional entity also has the media control request agent functionality, as, receive the RTSP request that UE sends, and be transmitted to content source.

In the handoff procedure, if carry out the switching of content source, then under the control of control command, medium grappling functional entity keep and UE between medium connect constant, only change and content source between Media Stream to; If UE switches, then under the control of control command, medium grappling functional entity keep and content source between medium connect constant, only change and UE between Media Stream to.

As can be seen, in the method embodiment illustrated in fig. 3, the effect of medium grappling functional entity is the function that realizes that between content source and UE fixed medium stream flows to, promptly no matter how UE switches, content source all only needs Media Stream is delivered to medium grappling functional entity, and need not the Media Stream flow direction along with the switching change content source of UE; Equally, no matter how content source is switched, and UE only need need not to change along with the switching of content source the Media Stream flow direction of UE from medium grappling functional entity receiving media stream.

For making purpose of the present invention, technical scheme and advantage clearer, and narration introduces switching control function entity and medium grappling functional entity below convenient simultaneously in network television system, and the present invention will be described with reference to accompanying drawing.

Fig. 4 is a kind of structured flowchart of realizing the system that network TV business switches of the embodiment of the invention.As shown in Figure 4, this system comprises: switching control function entity 101, medium grappling functional entity 102.Give the entity that other realize the network television system basic function among Fig. 4, comprise: conversation control function entity 103, subscriber equipment (User Equipment) 104, content source 105, Web TV application server (IPTV AS, IPTV Application Server) 106 and other network entities 107.

In Fig. 4, switching control function entity 101 is used to receive the service request that conversation control function entity 103 is transmitted, and handles according to 102 pairs of Media Streams of service request control medium grappling functional entity.The control information that switching control function entity 101 sends to medium grappling functional entity 102 can be transmitted by conversation control function entity 103, also can directly send to medium grappling functional entity 102, shown in dotted arrow among Fig. 1.

Medium grappling functional entity 102 is handled Media Stream under the control of switching control function entity 101, the IPTV service media stream that received content source 105 sends, and to UE 104 transmission IPTV service media streams.

Conversation control function entity 103 is used to carry out session control, management and route etc.For example, to switching control function entity 101, and service response sends to UE 104 with the service request routing forwarding of UE 104; The control information of switching control function entity 101 is forwarded to medium grappling functional entity, will sends to IPTV AS 106 through the service request that medium grappling functional entity 102 was handled, and the service response of reception feedback etc.

UE 104 is the equipment that the user receives network TV business, is used for initiating various IPTV service request to conversation control function entity 103, and receives the request response that conversation control function entity 103 is replied; The IPTV service media stream that receiving media grappling functional entity 102 sends.

Content source 105 is entities that the IPTV business tine is provided to the user, is used for sending IPTV service media stream to medium grappling functional entity 102.Content source 105 can be a media server, also can be UE.

IPTV AS 106 is the application servers that are used for process IP TV service request logic.

Other network entities 107 are with IPTV AS 106 mutual entity to be arranged in the IPTV service logic implementation.

Below, there are professional switching demand and content source that two kinds of situations of professional switching demand are arranged at user side, system shown in Figure 4 is described in further detail.

Fig. 5 is that system shown in Figure 4 sets up the professional process flow diagram that connects at user side.As shown in Figure 5, comprise step:

Step 501, the IPTV service request that UE 104 carries the UE session description information to conversation control function entity 103 initiations, conversation control function entity 103 sends to switching control function entity 101 with this IPTV service request.

Step 502, switching control function entity 101 carries out medium by conversation control function entity 102 control medium grappling functional entitys 102 to be handled, and after converting the UE session description information to medium grappling functional entity session description information, return to switching control function entity 101.Switching control function entity 101 sends to conversation control function entity 102 with medium grappling functional entity session description information.

Step 503, the IPTV service request that conversation control function entity 103 carries medium grappling functional entity session description information to IPTV AS 106 initiations.

Step 504, after IPTV AS 106 receives the IPTV service request of carrying medium grappling functional entity session description information, carry out alternately with other network entities 107, finish the IPTV Business Processing, and returning service response to conversation control function entity 103, conversation control function entity 103 returns to medium grappling functional entity 102 with service response.

Step 505 after medium grappling functional entity 102 is received service response, sends medium grappling functional entity session description informations to UE 104, finish with UE 104 between business be connected.

In the business that user side shown in Figure 5 is set up connected, IPTV service media stream can be sent to medium grappling functional entity 102 from content source 105 with clean culture or multicast mode, adopted the multicast mode during as the LTV business, adopted mode of unicast when VOD is professional; And the load mode of the IPTV service media stream of medium grappling functional entity 102 to UE 104 also can be clean culture or multicast mode, and for example the number of users according to the same business of request decides.

Medium grappling merit entity 102 has multicast and adds ability, when content source 105 when the Media Stream of medium grappling functional entity 102 is multicast, can join multicast group, and when the Media Stream of 104 of medium grappling functional entity 102 and UE was clean culture, 102 pairs of Media Streams of medium grappling merit entity multicast to the conversion of clean culture; When medium grappling

functional entity

102 and 104 of UE were multicast, medium grappling functional entity 102 became new multicast source under the control of switching control function entity 101, and Media Stream is carried out the old conversion that multicasts to new multicast.

When content source 105 is clean culture to the Media Stream of medium grappling functional entity 102, and the Media Stream of 104 of medium grappling functional entity 102 and UE is during also for clean culture, and medium grappling functional entity 102 is issued UE 104 after Media Stream being unicast to the conversion of clean culture; When also being multicast between medium grappling functional entity 102 and UE104, medium grappling functional entity 102 becomes new multicast source under the control of switching control function entity 101, and Media Stream is carried out the conversion of single broadcast to multicast.

After setting up professional the connection, media control request for UE 104 initiations, as real-time flow host-host protocol (RTSP, Real-Time Streaming Protocol) during control request, medium grappling functional entity 102 is as the medium control agent, the media control request that termination UE 104 initiates, and act on behalf of UE104 and initiate corresponding media control request to content source.

Fig. 6 is that system shown in Figure 4 carries out the professional process flow diagram that switches of user side.In this flow process, the user side business switches to UE2 from UE1.As shown in Figure 6, this flow process may further comprise the steps:

Step 601, UE1 initiates to carry the handoff request of the address of UE2 to conversation control function entity 103, and conversation control function entity 103 is routed to switching control function entity 101 with this handoff request.

Step 602, switching control function entity 101 is carried out switch logic, initiates professional request, the i.e. conversation request set up by conversation control function entity 103 to UE2; UE2 returns the professional response of setting up by controlled function entity 103 to switching control function entity 101.

Step 603, switching control function entity 101 by conversation control function entity 103 control medium grappling functional entitys 102 finish with UE2 between medium be connected, and the media stream duplication that will send to UE1 gives UE2, i.e. medium grappling functional entity 102 sends to UE1 and UE2 simultaneously with the Media Stream that content source 105 sends to UE1.

Step 604, two sessions of switching control function entity 101 related UE1 and UE2 are returned handoff response to UE1, and control medium grappling functional entity 102 disconnect with UE1 between medium be connected.

By said process, system shown in Figure 4 has realized the business switching of user side, and has guaranteed professional continuity in handoff procedure.

Fig. 7 is that system shown in Figure 4 sets up the professional process flow diagram that connects at the content source.As shown in Figure 7, comprise step:

Step 701, the IPTV service request that content source 105 is carried the content source session description information to conversation control function entity 103 initiations, conversation control function entity 103 sends to switching control function entity 101 with this IPTV service request.

Step 702, switching control function entity 101 carries out medium by conversation control function entity 102 control medium grappling functional entitys 102 to be handled, and after converting the content source session description information to medium grappling functional entity session description information, return to switching control function entity 101.Switching control function entity 101 sends to conversation control function entity 102 with medium grappling functional entity session description information.

Step 703, the IPTV service request that conversation control function entity 103 carries medium grappling functional entity session description information to IPTV AS 106 initiations.

Step 704, after IPTV AS 106 receives the IPTV service request of carrying medium grappling functional entity session description information, carry out alternately with other network entities, finish the IPTV Business Processing, and returning service response to conversation control function entity 103, conversation control function entity 103 returns to medium grappling functional entity 102 with service response.

Step 705 after medium grappling functional entity 102 is received service response, sends medium grappling functional entity session description informations to content source 105, finish with content source 105 between business be connected.

In the business that content source shown in Figure 7 is set up connects, IPTV service media stream can be sent to medium grappling functional entity 102 from content source 105 with clean culture or multicast mode, and the load mode of the IPTV service media stream of medium grappling functional entity 102 to UE 104 also can be clean culture or multicast mode.Adopt the multicast mode during as the LTV business, adopt mode of unicast when VOD is professional.

When content source 105 when the Media Stream of medium grappling functional entity 102 is multicast, medium grappling merit entity 102 joins multicast group, and when the Media Stream of 104 of medium grappling functional entity 102 and UE was clean culture or multicast, 102 pairs of Media Streams of medium grappling merit entity multicast to the conversion of clean culture or Media Stream are carried out the old conversion that multicasts to new multicast.

After setting up professional the connection, for the media control request that UE 104 initiates, medium grappling functional entity 102 is as the medium control agent, the media control request that termination UE 104 initiates, and act on behalf of UE 104 and initiate corresponding media control request to content source.

Fig. 8 is that system shown in Figure 4 carries out the process flow diagram that the content source side business switches.In this flow process, the content source side business switches to content source 2 from content source 1.As shown in Figure 8, this flow process may further comprise the steps:

Step 801, content source 1 initiates to carry the handoff request of the address of content source 2 to conversation control function entity 103, and conversation control function entity 103 is routed to switching control function entity 101 with this handoff request.

Step 802, switching control function entity 101 is carried out switch logic, initiates professional request, the i.e. conversation request set up by conversation control function entity 103 to content source 2; Content source 2 is returned the professional response of setting up by controlled function entity 103 to switching control function entity 101.

Step 803, switching control function entity 101 by conversation control function entity 103 control medium grappling functional entitys 102 finish with content source 2 between medium be connected, but only the Media Stream of content source 1 is transmitted to UE 104.

Step 804, two sessions of switching control function entity 101 content association sources 1 and content source 2, return handoff response to content source 1, control medium grappling functional entity 102 disconnect with content source 1 between medium is connected, and the Media Stream of forwarding content source 2 is to UE 104.

By said process, system shown in Figure 4 has realized the business switching of content source, and has guaranteed the continuity of business in the process.

Be preferred embodiment with IP Multimedia System (IMS, IP Multimedia Subsystem) below,, the switching of typical IPTV LTV business and the handoff procedure of VOD business described from user side and content source.Wherein, the switching for the content source is that UE is that example describes with the content source.In the IMS system, that corresponding with conversation control function entity 103 among Fig. 4 is call conversation control function entity (CSCF, Call Session Control Function).

Fig. 9 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of LTV at user side.Shown in 9, may further comprise the steps:

Step 901, UE sends the LTV service request to CSCF, carries the sign of program and the Session Description Protocol of UE (SDP, Session Description Protocol) information in the LTV service request; CSCF carries out after initial filter criteria (IFC, Initial Filter Codex) is handled the LTV service request being sent to the switching control function entity.

Step 902 after the switching control function entity is received the LTV service request, is carried out medium by CSCF control medium grappling functional entity and is handled, and UE SDP information translation is become medium grappling function SDP information, and return to the switching control function entity by CSCF.

Step 903, CSCF sends the LTV service request to IPTV AS, wherein carries program identification and medium grappling function SDP information.

Step 904 after IPTV AS receives the LTV service request, carries out obtaining information such as multicast address MA1 alternately with other network entities, finishes the LTV Business Processing.

Step 905, IPTV AS returns the LTV service response to CSCF, wherein carries the information such as multicast address MA1 of content source, and CSCF returns to the switching control function entity with the LTV service response again.

The LTV service response that step 906, switching control function entity will be carried the information such as multicast address MA1 of content source is handed down to medium grappling functional entity by CSCF, and medium grappling functional entity adds the multicast group of content source.

Next, when being clean culture between medium grappling functional entity and the UE execution in step 907 to step 908; Execution in step 909 is to step 912 when being multicast between medium grappling functional entity and the UE.

Step 907, after medium grappling functional entity joins the multicast group of content source, the Media Stream that receives from content source is multicast to the conversion of clean culture and the conversion of media formats, for example, the conversion of encoding and decoding: from H.264 converting the conversion of MPEG4, resolution to: convert 300 * 200 etc. to from 800 * 600; And medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information, and comprises unicast address in the medium grappling function DSP information; The switching control function entity sends response message to CSCF.

Step 908, CSCF sends the response of LTV service request to UE, wherein carries medium grappling function SDP information.

The LTV business of having finished when being clean culture between medium grappling functional entity and the UE to this is set up.

Step 909, the switching control function entity issues the multicast address MA2 of control information and medium grappling functional entity to medium grappling functional entity by CSCF, control medium grappling functional entity becomes new multicast source, and medium grappling functional entity carries out old the multicast to conversion of new multicast and the conversion of media formats to the Media Stream that receives from content source.

Step 910, medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information, and comprises multicast address in the medium grappling function SDP information; The switching control function entity sends response message to CSCF.

Step 911, CSCF sends the response of LTV service request to UE, wherein carries medium grappling function SDP information.

Step 912, UE adds multicast group.

Arrive this, finished professional foundation of LTV when being multicast between medium grappling functional entity and the UE.

After finishing business shown in Figure 9 and setting up process, content source, promptly the LTV multicast source is a multicast to the Media Stream between the medium grappling functional entity, medium grappling functional entity is clean culture or multicast to the Media Stream between the UE, shown in dotted arrow among Fig. 9.

Figure 10 is the process flow diagram that the LTV business switches to UE2 in the embodiment of the invention IMS system from UE1.Shown in 10, may further comprise the steps:

Step 1001, UE1 sends the professional handoff request of LTV, the address of wherein carrying UE2 by CSCF to the switching control function entity.

Step 1002, the switching control function entity is initiated the professional request of setting up by CSCF to UE2.

Step 1003, UE2 returns professional request response, the SDP information of wherein carrying UE2 set up by CSCF to the switching control function entity.

Step 1004, the switching control function entity sends control information to medium grappling functional entity by CSCF, wherein carries the SDP information of UE2, and control medium grappling functional entity carries out medium to be handled, and the SDP information translation of UE2 is become medium grappling function SDP information.

Step 1005, medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information.

Step 1006, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity finish with UE2 between medium be connected, and the Media Stream that will send to UE1 duplicates simultaneously and is distributed to UE2, shown in dotted arrow among Figure 10.

When being the multicast load mode between medium grappling functional entity and the UE2, UE2 adds multicast group, shown in chain-dotted line square frame among Figure 10.

Step 1007, the switching control function entity sends handoff response information by CSCF to UE1.

Step 1008, UE1 returns conversation end information by CSCF to the switching control function entity, and the switching control function entity returns finishing switching information to UE1 equally.

Step 1009, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity disconnect with UE1 between medium be connected.At this moment, medium grappling functional entity only sends Media Stream to UE2.

Arrive this, finished the LTV service switch process of user side, this process can guarantee continuity professional in the handoff procedure.

Figure 11 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of VOD at user side.Shown in 11, may further comprise the steps:

Step 1101, UE sends the VOD service request to CSCF, carries the sign of program and the SDP information of UE in the VOD service request, and CSCF sends to the switching control function entity with the VOD service request after carrying out the IFC processing.

Step 1102 after changing the controlled function entity and receiving the VOD service request, is carried out medium by CSCF control medium grappling functional entity and is handled, and UE SDP information translation is become medium grappling function SDP information, and return to the switching control function entity by CSCF.

Step 1103, CSCF sends the VOD service request to IPTV AS, wherein carries program identification and medium grappling function SDP.

Step 1104 after IPTV AS receives the VOD service request, carries out carrying out media resource scheduling alternately with other network entities, obtains information such as media server address, finishes the VOD Business Processing.

Step 1105, IPTV AS returns the VOD service response to CSCF, wherein carries the SDP information of media server etc., and CSCF returns to the switching control function entity with the VOD service response again.

Step 1106, the switching control function entity is handed down to medium grappling functional entity with the VOD service response by CSCF.

Next, when being clean culture between medium grappling functional entity and the UE execution in step 1107 to step 1108; Execution in step 1109 is to step 1112 when being multicast between medium grappling functional entity and the UE.

Step 1107, after medium grappling functional entity is received the VOD service response, the Media Stream that receives from content source is unicast to the conversion and the media format conversion of clean culture, and return response message to the switching control function entity by CSCF, wherein carry medium grappling function SDP information, and comprise unicast address in the SDP information; The switching control function entity sends response message to CSCF.

Step 1108, CSCF sends the response of VOD service request to UE, wherein carries medium grappling function SDP information.

The VOD business of having finished when being clean culture between medium grappling functional entity and the UE to this is set up.

Step 1109, the switching control function entity issues the multicast address of control information and medium grappling functional entity to medium grappling functional entity by CSCF, control medium grappling functional entity becomes new multicast source, and medium grappling functional entity carries out the conversion of single broadcast to multicast and the conversion of media formats to the Media Stream that receives from content source.

Step 1110, medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information, and comprises multicast address in the SDP information; The switching control function entity sends response message to CSCF.

Step 1111, CSCF sends the response of VOD service request to UE, wherein carries medium grappling function SDP information.

Step 1112, UE adds multicast group.

Arrive this, finished professional foundation of VOD when being multicast between medium grappling functional entity and the UE.

After finishing business shown in Figure 11 and setting up process, content source, promptly VOD service media server is clean culture to the Media Stream between the medium grappling functional entity, medium grappling functional entity is clean culture or multicast to the Media Stream between the UE, shown in dotted arrow among Figure 11.

Among Figure 11, give in business and carry out in the process, medium grappling functional entity is acted on behalf of UE and content source and is carried out alternately as the medium control agent, carries out the flow chart of medium control, may further comprise the steps:

Step 1113, UE initiates the RTSP control request to medium grappling functional entity, and medium grappling function controlled entity is forwarded to VOD service media server with the RTSP control request.

Step 1114, VOD service media server returns RTSP control request response message to medium grappling controlled function entity, and medium grappling controlled function entity is transmitted RTSP control request response message to UE.

Figure 12 is the process flow diagram that the VOD business switches to UE2 in the embodiment of the invention IMS system from UE1.Shown in 12, may further comprise the steps:

Step 1201, UE1 sends the professional handoff request of VOD by CSCF to the switching control function entity, wherein carries the information such as address, breakpoint information, program identification of UE2.

Step 1202, the switching control function entity is initiated the professional request of setting up by CSCF to UE2.

Step 1203, UE2 returns professional request response, the SDP information of wherein carrying UE2 set up by CSCF to the switching control function entity.

Step 1204, the switching control function entity sends control information to medium grappling functional entity by CSCF, wherein carries breakpoint information, and control medium grappling functional entity carries out medium to be handled, and the SDP information translation of UE2 is become medium grappling function SDP information.

Step 1205, medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information.

Step 1206, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity finish with UE2 between medium be connected.

When being the multicast load mode between medium grappling functional entity and the UE2, in step 1206, UE2 adds multicast group, shown in chain-dotted line square frame among Figure 12.

Step 1207, medium grappling functional entity sends the RTSP control request that begins to play from breakpoint to VOD service media server, and the Media Stream of VOD service media server transmission is sent to UE1 and UE2 simultaneously, shown in dotted arrow among Figure 12.

Step 1208, the switching control function entity sends handoff response information by CSCF to UE1.

Step 1209, UE1 returns conversation end information by CSCF to the switching control function entity, and the switching control function entity returns finishing switching information to UE1 equally.

Step 1210, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity disconnect with UE1 between medium be connected.At this moment, medium grappling functional entity only sends Media Stream to UE2.

Arrive this, finished the VOD service switch process of user side, this process can guarantee continuity professional in the handoff procedure.

Figure 13 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of LTV at the content source.As shown in figure 13, may further comprise the steps:

Step 1301, content source sends the professional upload request of LTV to CSCF, wherein carries the information such as SDP information, content metadata of content source; CSCF carries out after IFC handles the professional upload request of LTV being sent to the switching control function entity.

Step 1302, after the switching control function entity is received the professional upload request of LTV, carry out medium by CSCF control medium grappling functional entity and handle, the SDP information translation of content source is become medium grappling function SDP information, and return to the switching control function entity by CSCF.

Step 1303, CSCF sends the professional upload request of LTV to IPTV AS, wherein carries content metadata and medium grappling function SDP information.

Step 1304, IPTV AS carries out finishing the LTV Business Processing alternately with other network entities after receiving the professional upload request of LTV.

LTV Business Processing in this step comprises: inquiring user content uploading authority, obtain program identification, obtain multicast address, transmit content metadata, program identification, carry out electronic program list (EPG, Electronic Programme Guide) data organization etc.

Step 1305, IPTV AS preserves program identification and multicast address, and returns program identification and multicast address by CSCF to the switching control function entity.

Step 1306, the switching control function entity sends to medium grappling functional entity by CSCF with program identification and multicast address.

Step 1307, when content source when the Media Stream of medium grappling functional entity is the multicast circulation way, medium grappling functional entity adds multicast group, and Media Stream multicast to the conversion of multicast and the conversion of media formats, otherwise content source is when the Media Stream of medium grappling functional entity is the unicast transmit mode, and medium grappling functional entity carries out the conversion of single broadcast to multicast and the conversion of media formats to Media Stream.The functional entity of medium grappling afterwards returns medium grappling function SDP information and program identification by CSCF to the switching control function entity, and the switching control function entity sends to CSCF with medium grappling function SDP information and program identification again.

Step 1308, CSCF sends the professional upload request response of LTV to content source, wherein carries medium grappling function SDP information and program identification.

Arrive this, finished professional foundation of LTV of content source.

After finishing business shown in Figure 13 and setting up process, content source is clean culture or multicast to the Media Stream between the medium grappling functional entity, and medium grappling functional entity is a multicast to the Media Stream between the UE, shown in dotted arrow among Figure 13.

Figure 14 is the process flow diagram that the LTV business switches to content source 2 in the embodiment of the invention IMS system from content source 1.Shown in 14, may further comprise the steps:

Step 1401, content source 1 sends the professional handoff request of LTV by CSCF to the switching control function entity, wherein carries the address URL and the program identification of content source 2.

Step 1402, the switching control function entity is initiated the professional request of setting up by CSCF to content source 2.

Step 1403, content source 2 is returned the professional request response of setting up by CSCF to the switching control function entity, wherein carries the SDP information of content source 2.

Step 1404, the switching control function entity sends control information to medium grappling functional entity by CSCF, wherein carry the SDP information of content source 2, control medium grappling functional entity carries out medium to be handled, and the SDP information translation of content source 2 is become medium grappling function SDP information.

Step 1405, medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information.

Step 1406, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity finish with content source 2 between medium be connected, medium grappling functional entity is the Media Stream 1 in received content source 1 and the Media Stream 2 of content source 2 simultaneously, and only the Media Stream 1 of content source 1 is transmitted to UE.

Step 1407, the switching control function entity sends handoff response information by CSCF to content source 1.

Step 1408, content source 1 is returned conversation end information by CSCF to the switching control function entity, and the switching control function entity returns finishing switching information to content source 1 equally.

Step 1409, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity disconnect with content source 1 between medium be connected, and the Media Stream 2 of content source 2 is transmitted to UE.

Arrive this, finished the LTV service switch process of content source, this process can guarantee continuity professional in the handoff procedure.

In the middle of reality, content source may be a media server, also may be UE.When UE provides media content as other UE of content source of VOD business, promptly during Media Stream, following two kinds of transmission meanss are arranged:

1) content source UE initiates the professional upload request of VOD to IPTV AS, and IPTV AS specifies the media server that is used for storing media content; The media content of content source UE uploads on the media server after handling through medium grappling functional entity; When other UE initiate the VOD service request, provide media content by media server.

2) content source UE only issues its content information, and does not issue its media content to the server of network side, and media content is kept at content source UE this locality; When other UE initiated the VOD service request, IPTV AS pointed to medium grappling functional entity with the VOD service request, asks corresponding media content by medium grappling functional entity to content source UE.

Describe below in mode 2) situation under, the process of setting up and the handoff procedure of VOD business.

Figure 15 is that embodiment of the invention IMS system sets up the professional process flow diagram that connects of VOD at the content source.Shown in 15, may further comprise the steps:

Step 1501, content source sends the professional upload request of VOD by CSCF to the switching control function entity, wherein carries the SDP information, content metadata of content source etc.

Step 1502, after the switching control function entity is received the professional upload request of VOD, carry out medium by CSCF control medium grappling functional entity and handle, the SDP information translation of content source is become medium grappling function SDP information, and return to the switching control function entity by CSCF.

Step 1503, CSCF sends the professional upload request of VOD to IPTV AS, wherein carries content metadata and medium grappling function SDP information.

Step 1504, IPTV AS carries out finishing the VOD Business Processing alternately with other network entities after receiving the professional upload request of VOD.

VOD Business Processing in this step comprises: inquiring user content uploading authority, obtain program identification, transmit content metadata, program identification, carry out electronic program list (EPG, Electronic ProgrammeGuide) data organization etc.

Step 1505, IPTV AS returns the professional upload request response message of VOD by CSCF to the switching control function entity.

Step 1506, the switching control function entity sends to medium grappling functional entity by CSCF with the professional upload request response message of VOD.

Step 1507, medium grappling functional entity arrives medium grappling functional entity according to content source, and medium grappling functional entity is to the circulation way of the Media Stream of UE, and Media Stream is multicast to multicast, single broadcast to multicast, unicasts to the conversion that unicasts or multicast to clean culture and the conversion of media formats.The functional entity of medium grappling afterwards medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information, and the switching control function entity sends to CSCF with response message again.

Step 1508, CSCF sends response message to content source.

Arrive this, finished professional foundation of VOD of content source.

After finishing business shown in Figure 15 and setting up process, content source is clean culture or multicast to the Media Stream between the medium grappling functional entity, and medium grappling functional entity is clean culture or multicast to the Media Stream between the UE, shown in dotted arrow among Figure 15.

Figure 16 is the process flow diagram that the VOD business switches to content source 2 in the embodiment of the invention IMS system from content source 1.Shown in 16, may further comprise the steps:

Step 1601, content source 1 sends the professional handoff request of VOD by CSCF to the switching control function entity, wherein carries the information such as address, breakpoint information, program identification of content source 2.

Step 1602, the switching control function entity is initiated the professional request of setting up by CSCF to content source 2, wherein carries breakpoint information, program identification.

Step 1603, content source 2 is returned the professional request response of setting up by CSCF to the switching control function entity, wherein carries the SDP information of content source 2.

Step 1604, the switching control function entity sends control information to medium grappling functional entity by CSCF, wherein carry the SDP information of content source 2, control medium grappling functional entity carries out medium to be handled, and the SDP information translation of content source 2 is become medium grappling function SDP information.

Step 1605, medium grappling functional entity returns response message by CSCF to the switching control function entity, wherein carries medium grappling function SDP information.

Step 1606, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity finish with content source 2 between medium be connected, medium grappling functional entity is the Media Stream 1 in received content source 1 and the Media Stream 2 that content source 2 begins to upload from breakpoint simultaneously, and only the Media Stream of content source 1 is transmitted to the user.

Step 1607, the switching control function entity sends handoff response information by CSCF to content source 1.

Step 1608, content source 1 is returned conversation end information by CSCF to the switching control function entity, and the switching control function entity returns finishing switching information to content source 1 equally.

Step 1609, the switching control function entity sends control information to medium grappling functional entity by CSCF, control medium grappling functional entity disconnect with content source 1 between medium be connected, and the Media Stream 2 of content source 2 is transmitted to the user.

Arrive this, finished the VOD service switch process of content source, this process can guarantee continuity professional in the handoff procedure.

Next provide the structured flowchart of the switching control function entity of introducing among Fig. 2, Figure 17 is a kind of structured flowchart of realizing the device of switching control function of the embodiment of the invention, as shown in figure 17, a kind of device 1701 of switching control function of realizing comprises: media management module 1702 and switching controls module 1703.

In Figure 17, media management module 1702, be used to receive service request, pay entity transmission media control information to UE and/or streaming medium content, service request after handling is sent to IPTV AS, and receive the media control information that IPTV AS sends, send to streaming medium content after handling and pay entity and/or UE; Switching controls module 1703, be used to receive switch and initiate the handoff request that entity sends, and pay entity to UE and/or streaming medium content and send: set up the medium of accepting between the entity with switching earlier and be connected, simultaneously to switch initiate entity and switch accept entity send Media Stream or will be simultaneously from switching sending entity and accepting the Media Stream that entity receives and select to be transmitted to UE, cut off the switching control information that is connected with the medium that switch between the initiation entity then.

Provide the structured flowchart of the medium grappling functional entity of introducing among Fig. 3 below, Figure 18 is a kind of structured flowchart of realizing the device of medium grappling function of the embodiment of the invention, as shown in figure 18, a kind of device 1801 of medium grappling function of realizing comprises: instruction control module 1802, Media Stream transceiver module 1803 and media control request proxy module 1805, and the Media Stream transceiver module comprises Media Stream processing module 1804.

In Figure 18, the Media Stream that Media Stream transceiver module 1803 received content sources send, and the Media Stream that is received by 1804 pairs of Media Stream transceiver modules 1803 of Media Stream processing module carries out single broadcast to multicast, or unicast to clean culture, or multicast to clean culture, or after multicasting to the conversion of the conversion of multicast and media formats, the Media Stream that Media Stream transceiver module 1803 was handled Media Stream processing module 1804 sends to UE.Instruction control module 1802 is used for setting up process at network TV business and receives outside media control information, and 1803 pairs of Media Streams of control Media Stream transceiver module is handled; When network TV business switches, receive outside switching control information, and 1803 foundation earlier of control Media Stream transceiver module are connected with the medium that switching is accepted between the entity, simultaneously initiate entity and switch to accept entity and send Media Stream or will be simultaneously be connected from switching sending entity and accept the Media Stream that entity receives and select to be transmitted to UE, cutting off then with the medium that switch between the initiation entity to switching.Media control request proxy module 1805 is used to receive the media control request that UE sends, and media control request is transmitted to content source.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. method that realizes that network TV business switches is characterized in that this method comprises:

2. the method for claim 1 is characterized in that,

Described streaming medium content is paid entity and is comprised: content source and/or medium grappling functional entity;

It is content source or UE that entity is accepted in described switching initiation entity and switching;

Described content source is UE or media server.

3. method that realizes that network TV business switches is characterized in that this method comprises:

4. method as claimed in claim 3 is characterized in that,

It is UE or content source that entity is accepted in described switching initiation entity and switching;

Described content source is UE or media server.

5. method as claimed in claim 4 is characterized in that,

When described switching is initiated entity and switching and is accepted entity and be content source, described medium grappling functional entity is set up the medium of accepting between the entity with switching earlier and is connected, with simultaneously from switching sending entity and accepting the Media Stream that entity receives and select to be transmitted to UE, cut off then and switch the medium of initiating between the entity and is connected and comprises: the foundation earlier of medium grappling functional entity is connected with the medium that switching is accepted between the entity content source, receive simultaneously to switch and initiate the entity content source and switch to accept the Media Stream of entity content source, be transmitted to UE but only will switch the Media Stream of initiating the entity content source; Medium grappling functional entity cuts off with the medium that switch between the initiation entity content source and is connected then, and the Media Stream of switching being accepted the entity content source is transmitted to UE;

When described switching is initiated entity and switching and is accepted entity and be UE, described medium grappling functional entity is set up the medium of accepting between the entity with switching earlier and is connected, accept entity transmission Media Stream to switching initiation entity and switching simultaneously, cut off then and switch the medium of initiating between the entity and is connected and comprises: medium grappling functional entity is set up earlier and is switched the medium of accepting between the entity UE and be connected, and the Media Stream of content source transmission is duplicated simultaneously issue switching initiation entity UE and entity UE is accepted in switching; Medium grappling functional entity cuts off and switches the medium of initiating between the entity UE and is connected then, the Media Stream of content source transmission only is transmitted to switching accepts entity UE.

6. method as claimed in claim 3 is characterized in that, described media control information and switching control information are to send to medium grappling functional entity by the switching control function entity or by IPTV AS.

7. method as claimed in claim 6, it is characterized in that, described switching control function entity is directly to send to medium grappling functional entity or be transmitted to medium grappling functional entity by conversation control function entity to media control information and the switching control information that medium grappling functional entity sends.

8. method as claimed in claim 3, it is characterized in that, this method connects in business to be set up in the process, further comprise: medium grappling functional entity carries out single broadcast to multicast to the Media Stream that receives from content source, or unicast to clean culture, or multicast to clean culture, or after multicasting to the conversion of multicast, send to UE again.

9. method as claimed in claim 3 is characterized in that, this method carries out further comprising in the process in business: medium grappling functional entity receives the media control request that UE sends, and media control request is transmitted to content source.

10. method as claimed in claim 3 is characterized in that, this method connects in business to be set up in the process, and further comprise: medium grappling functional entity sends to UE after the Media Stream that receives from content source is carried out media format conversion again.

11. method as claimed in claim 3 is characterized in that, when content source when the Media Stream circulation way of medium grappling functional entity is multicast, this method further comprises: medium grappling functional entity adds multicast group.

12. a system that realizes that network TV business switches is characterized in that this system comprises:

13. system as claimed in claim 12 is characterized in that,

Described switching control function entity is further used for sending the media control information of carrying out the medium processing to medium grappling functional entity;

Described medium grappling functional entity is further used for carrying out medium and handles after receiving described media control information.

14. system as claimed in claim 12 is characterized in that,

Described content source is UE or media server.

15. a method that realizes that network TV business switches is characterized in that this method comprises:

16. method as claimed in claim 15 is characterized in that,

Before described step B, further comprise:

Switch and initiate entity, send professional handoff request to the switching control function entity by conversation control function entity;

The switching control function entity is accepted entity to switching and is sent the professional request of setting up by conversation control function entity; Switch and accept entity, return the professional request response of setting up to the switching control function entity by conversation control function entity;

The switching controls entity sends to medium grappling functional entity and carries out the media control information that medium are handled; Medium grappling functional entity carries out the medium processing and returns response message to the switching control function entity;

Before being connected, the medium between cut-out described in the step B and the switching initiation entity further comprise:

The switching control function entity sends professional switching request response information by conversation control function entity to switching the initiation entity; Switch and initiate entity, return conversation end information to the switching control function entity by conversation control function entity.

17. as claim 15 or 16 described methods, it is characterized in that, the switching control function entity is directly to send to medium grappling functional entity or be transmitted to medium grappling functional entity by conversation control function entity to media control information and the switching control information that medium grappling functional entity sends.

18. as claim 15 or 16 described methods, it is characterized in that,

It is UE or content source that entity is accepted in described switching initiation entity and switching, and described content source is UE or media server.

19. method as claimed in claim 18, it is characterized in that, to accept entity be UE when entity and switching are initiated in described switching, when described professional handoff request is LIV business handoff request, described in the step B, medium grappling functional entity is set up the medium of accepting between the entity with switching and is connected, simultaneously initiate entity and switching and accept entity and send Media Stream and comprise to switching: medium grappling functional entity will send to from the Media Stream that content source receives and switch when initiating entity UE, duplicate to issue to switch and accept entity UE.

20. method as claimed in claim 18 is characterized in that, to accept entity with switching be UE when entity is initiated in described switching, when described professional handoff request is VOD business handoff request,

Described switching is initiated entity by conversation control function entity, comprises breakpoint information in the professional handoff request that the switching controls entity sends;

Described switching controls entity comprises breakpoint information in the media control information of carrying out the medium processing that medium grappling functional entity sends;

Set up and switch the medium of accepting between the entity and is connected at the functional entity of medium grappling described in the step B, initiate entity and switching and accept entity and send Media Stream or comprise to switching simultaneously: medium grappling functional entity sends the real time flow medium that begins to play from breakpoint to content source and transmits and asks; Medium grappling functional entity will send to from the Media Stream that content source receives and switch when initiating entity UE, duplicate to issue to switch and accept entity UE.

21. method as claimed in claim 18 is characterized in that, to accept entity with switching be content source when entity is initiated in described switching, when described professional handoff request is LTV business handoff request,

Described in the step B, medium grappling functional entity is set up the medium of accepting between the entity with switching and is connected, with simultaneously from switching sending entity and accepting Media Stream that entity receives and select to be transmitted to UE and comprise: medium grappling functional entity receives to switch to receive to switch when initiating Media Stream that the entity content source sends accepts the Media Stream that the entity content source sends, and is transmitted to UE but only will switch the Media Stream of initiating the transmission of entity content source; Comprise after medium between described cut-out and switching initiation entity are connected: the Media Stream that will switch the transmission of receiving entity content source is transmitted to UE.

22. method as claimed in claim 18 is characterized in that, to accept entity with switching be content source when entity is initiated in described switching, when described professional handoff request is VOD business handoff request,

Described switching control function entity is accepted business that entity sends to switching and is set up in the request and comprise breakpoint information;

Described in the step B, medium grappling functional entity is set up the medium of accepting between the entity with switching and is connected, with simultaneously from switching sending entity and accepting Media Stream that entity receives and select to be transmitted to UE and comprise: medium grappling functional entity receives and switches when initiating Media Stream that the entity content source sends, receive to switch and accept the Media Stream that the entity content source begins to send from breakpoint, be transmitted to UE but only will switch the Media Stream of initiating the transmission of entity content source; Comprise after medium between described cut-out and switching initiation entity are connected: the Media Stream that will switch the transmission of receiving entity content source is transmitted to UE.

23. method as claimed in claim 18, it is characterized in that, before steps A, further may further comprise the steps:

A, switching are initiated entity by conversation control function entity, send to the switching control function entity to comprise the service request of switching initiation entity session description information;

B, switching control function entity control medium grappling functional entity carry out medium to be handled, and will switch initiation entity session description information and convert medium grappling functional entity session description information to;

C, conversation control function entity send the service request that comprises medium grappling functional entity session description information to Web TV application server IPTV AS; IPTV AS finishes Business Processing;

D, medium grappling functional entity are initiated the response of entity transmission service request to switching, and wherein comprise medium grappling functional entity session description information.

24. method as claimed in claim 23 is characterized in that,

Initiating entity when described switching is UE, and medium grappling functional entity is when switching the Media Stream circulation way of initiating between the entity UE and be clean culture, and service request described in the steps d comprises unicast address in responding;

Initiating entity when described switching is UE, and when the Media Stream circulation way between medium grappling functional entity and the switching initiation entity UE is multicast, further comprised before steps d: the switching control function entity passes through conversation control function entity, send the control information that comprises multicast address to medium grappling functional entity, control medium grappling functional entity becomes multicast source; Comprise multicast address in the response of service request described in the steps d; After steps d, further comprise: switch and accept entity UE adding multicast group.

25. a device of realizing medium grappling function is characterized in that, this device comprises:

26. device as claimed in claim 25, it is characterized in that, described Media Stream transceiver module further comprises the Media Stream processing module, the Media Stream that is used for the Media Stream transceiver module is received carries out single broadcast to multicast, or unicast to clean culture, or multicast to clean culture, or multicast to the conversion of multicast and the conversion of media formats; The Media Stream that the Media Stream transceiver module was handled the Media Stream processing module sends to UE.

27. device as claimed in claim 25 is characterized in that, this device further comprises the media control request proxy module, is used to receive the media control request that UE sends, and media control request is transmitted to content source.

28. a device of realizing switching control function is characterized in that, this device comprises: