WO2009117917A1 - 一种流媒体业务的切换方法、系统和装置 - Google Patents

一种流媒体业务的切换方法、系统和装置 Download PDF

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Publication number
WO2009117917A1
WO2009117917A1 PCT/CN2009/070706 CN2009070706W WO2009117917A1 WO 2009117917 A1 WO2009117917 A1 WO 2009117917A1 CN 2009070706 W CN2009070706 W CN 2009070706W WO 2009117917 A1 WO2009117917 A1 WO 2009117917A1
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WIPO (PCT)
Prior art keywords
media
switching
information
function entity
service
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PCT/CN2009/070706
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English (en)
French (fr)
Inventor
王耕
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to ES09725815.6T priority Critical patent/ES2557899T3/es
Priority to EP09725815.6A priority patent/EP2259506B1/en
Publication of WO2009117917A1 publication Critical patent/WO2009117917A1/zh
Priority to US12/892,809 priority patent/US20110019620A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/10—Packet switching elements characterised by the switching fabric construction
    • H04L49/109—Integrated on microchip, e.g. switch-on-chip
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]

Definitions

  • the invention relates to a method, system and device for switching a streaming media service.
  • the application is submitted to the Chinese Patent Office on March 28, 2008, and the application number is 200810090355.9.
  • the invention name is "a switching method, system and device for streaming media services”.
  • the embodiments of the present invention relate to the field of network communication technologies, and in particular, to a method, system, and device for switching a streaming media service. Background technique
  • the streaming media service is a multimedia application developed from the Internet, which refers to the use of streaming to transmit multimedia files over the network, including audio, video and animation.
  • the mobile streaming media service is the application of streaming media technology on mobile networks and terminals. It mainly uses the current 2.5G or 3G (Third Generation Mobile Communication) mobile communication network to provide audio and video streaming media for mobile terminals. service.
  • the content of the mobile streaming service includes news, video, MTV (Music Television), sports, education, industry and special applications.
  • PSS Packet Switched Streaming Service
  • RTSP Real Time Streaming
  • Protocol based on real-time streaming protocol.
  • PSS technology defines a fast content switching technology. It assumes that the user has established an RTSP session and is watching a content or program. If the user wants to change the currently viewed content, it does not have to send an RTSP SETUP message to re-establish.
  • RTSP session but only need to send a special RTSP PLAY message, carry the identifier of the new content that you want to watch in the RTSP PLAY message, you can use the original media channel to send the switched content, thus eliminating the need
  • the renegotiation of the media processing has improved the performance of the handover.
  • IMS IP Multimedia Subsystem, IP Multimedia Subsystem
  • SIP Session Initiation Protocol
  • SIP Session Initiation Protocol
  • AS Application Servers
  • User equipment can obtain services from AS through IMS.
  • resource reservation is required to provide reliable transmission quality, and resource reservation usually takes a relatively long time.
  • IPTV Internet Protocol Television
  • the embodiment of the invention provides a method, a system and a device for switching a streaming media service, so as to implement a switching of a streaming media service by using a real-time streaming fast switching capability in an IMS architecture.
  • an embodiment of the present invention provides a method for switching a streaming media service, where the switching of the streaming media service is performed under the IMS architecture of the IP multimedia subsystem, including:
  • an embodiment of the present invention further provides a switching system for a streaming media service, including:
  • User equipment configured to send a handover request
  • a media server configured to receive a handover request directly sent by the user equipment, or receive a handover request or an indication sent by the service control function entity after receiving the handover request sent by the user equipment, and use the media channel before the handover
  • the user equipment sends the switched media content.
  • the embodiment of the present invention further provides a media server, including: a receiving module, configured to receive a handover request directly sent by the user equipment, or receive a handover request sent by the user equipment by the receiving service control function entity;
  • a sending module configured to send the switched media content to the user equipment by using a media channel before switching.
  • the embodiment of the present invention provides a method for switching a streaming media service by using the fast switching capability of the PSS under the IMS architecture, and realizing the use of the IMS architecture before the handover.
  • the media channel transmits the switched media content, and at the same time, the media channel can be adjusted according to the need of transmitting the media after switching, and the switching is counted or billed, thereby improving the switching speed, the user experience, and the network switching. control ability.
  • FIG. 1 is a flowchart of a method for switching a streaming media service according to an embodiment of the present invention
  • FIG. 2 is a flowchart of Embodiment 1 of a method for switching a streaming media service according to the present invention
  • FIG. 3 is a flowchart of Embodiment 2 of a method for switching a streaming media service according to the present invention
  • FIG. 5 is a flowchart of Embodiment 4 of a method for switching a streaming media service according to the present invention
  • FIG. 6 is a flowchart of Embodiment 5 of a method for switching a streaming media service according to the present invention
  • FIG. 8 is a flowchart of Embodiment 6 of a method for switching a streaming media service according to the present invention
  • FIG. 9 is a flowchart of Embodiment 7 of a method for switching a streaming media service according to the present invention
  • FIG. 10 is a flowchart of Embodiment 8 of a method for switching a streaming media service according to the present invention
  • FIG. 12 is a structural diagram of a switching system of a streaming media service according to an embodiment of the present invention
  • FIG. 13 is a structural diagram of a media server according to an embodiment of the present invention
  • FIG. 14 is a structural diagram of a service control function entity according to an embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a method for switching a streaming media service, so that a user can switch the currently viewed content in the IMS-based mobile streaming media service, and the switching speed is improved.
  • a flowchart of a method for switching a streaming media service includes:
  • Step S101 Receive a handover request sent by the user equipment, where the handover request carries the requested media identifier.
  • the user equipment Before receiving the handover request sent by the user equipment, the user equipment first needs to acquire the capability information of the media server, where the capability information is capability information of whether the media server has the switch using the RTSP session before the handover.
  • the user equipment sends a handover request to the media server.
  • the information about the capability of the user equipment to obtain the media server may be: obtaining the capability information of the media server by using a content menu or a content list provided by the network side; or
  • the capability information of the media server is obtained by the service control function entity; or the RTSP session between the user equipment and the media server is established, and the user equipment directly obtains the capability information of the media server from the media server.
  • the media server at any time after receiving the handover request sent by the user equipment A notification message is sent to the service control function entity to notify the occurrence of the handover of the service control function entity.
  • the media server can perform an authorization check on the handover request. Specifically, it may be that the authorization check information is obtained, and then it is judged according to the obtained authorization check information whether the handover request from the user equipment can be authorized.
  • the obtaining the authorization check information may be: obtaining the authorization check information from the function entity that saves the authorization check information, or configuring the authorization check information in the media server, and obtaining the authorization check information from the media server.
  • the authorization check of the handover request may also be: sending an authorization check request to the service control function entity, requesting the service control function entity to perform an authorization check on the handover request. If this method is employed, the process of notifying the occurrence of the handover of the service control function entity can be performed simultaneously with the process of transmitting an authorization check request to the service control function entity.
  • Step S102 Send the switched media content to the user equipment by using the media channel before the handover.
  • the media server Before transmitting the switched media content to the user equipment by using the media channel before switching, the media server adjusts the media channel according to the switching request. Specifically, it can be:
  • Modify the media channel If the media content of the switched media content is different from the requirements of the media channel, the switched media channel is modified according to the new requirement, including but not limited to QoS parameters, such as bandwidth, jitter, delay, or packet loss rate.
  • QoS parameters such as bandwidth, jitter, delay, or packet loss rate.
  • using the media channel before switching to send the switched media content to the user equipment may be:
  • the switched media content is sent to the user equipment by using the media channel before the switching.
  • the changed media content can also be:
  • the first media server acquires the switched media from the second media server that includes the switched media content. Content, and then the first media server sends the acquired switched media content to the user equipment through the media channel before the switching.
  • the obtaining, by the first media server, the switched media content from the second media server that includes the switched media content may be:
  • the first media server sends an RTSP session establishment request to the second media server, establishes an RTSP session, and obtains the switched media content through the RTSP session;
  • the first media server acquires the switched media content from the second media server through FTP (File Transfer Protocol).
  • FTP Full Transfer Protocol
  • an authorization check is also performed on the handover request.
  • the second media server requests the service control function entity to perform an authorization check on the handover request
  • the first media server requests authorization check information from the service control function entity, and determines whether the handover request from the user equipment can be authorized based on the authorization check information.
  • the method for switching the streaming media service realizes the switching of the streaming media service by using the fast switching capability of the real-time stream under the IMS architecture, and realizes the transmission of the switched media content by using the media channel before the switching, thereby improving the switching speed and the user.
  • the degree of experience realized by using the fast switching capability of the real-time stream under the IMS architecture, and realizes the transmission of the switched media content by using the media channel before the switching, thereby improving the switching speed and the user. The degree of experience.
  • Embodiment 1 As shown in FIG. 2, it is a flowchart of Embodiment 1 of a method for switching a streaming media service according to the present invention.
  • a user equipment sends a handover request by using an RTSP session between the user equipment and the media server before switching, and finally uses the handover request.
  • the media channel sends the content indicated in the switch request. Specifically include:
  • Step S201 the UE (User Equipment, User Equipment) passes the GPRS (Geneneral Packer Radio Service) network, and the P-CSCF (Proxy Call Server Control Function) and the IMS core service control function.
  • the entity sends a SIP INVITE message requesting the establishment of a service.
  • the SIP INVITE message carries information such as a media content identifier, an IP address and port of the UE side transceiver medium, and a codec.
  • Step S202 The service control function entity sends an RTSP establishment message to the media server, requesting to establish an RTSP session, where the RTSP setup message carries information such as a media content identifier, an IP address and a port of the UE side transceiver medium, and a codec.
  • Step S203 the media server accepts the request, returns an RTSP response message, for example: 200 OK, and allocates an RTSP session identifier.
  • the RTSP response message carries the IP address and port of the media on the media server side, and the codec and other information.
  • Step S204 The service control function entity sends a SIP response message to the UE, for example: a SIP 183 response message.
  • the SIP response message carries information such as an IP address and a port of the media server side to send and receive media, and a codec.
  • Step S205 The UE sends a SIP PRACK message to the service control function entity.
  • Step S207 reserving transmission resources for media transmission of the UE.
  • Step S208 The UE sends a SIP UPDATE message to the service control function entity.
  • Step S209 The service control function entity sends a SIP response message to the UE, for example: a SIP 200 OK message.
  • Step S204 to step S206 and step S208 and step S209 are optional steps, and step S207 can be executed at any time after step S201.
  • Step S210 The service control function entity sends a SIP response message to the UE, for example: a 200 OK message.
  • Step S211 The UE sends a SIP ACK (Acknowledgement) message to the service control function entity.
  • Step S212 the service control function entity sends an RTSP PLAY message to the media server to request media playback.
  • Step S212 and step S213 can also be performed between the user equipment and the media server. So far, the UE establishes a service with the network side, and the media server starts to send content to the UE.
  • the media server is a PSS (Packet Switched Streaming Service) server, but the media server may also be a media resource function entity.
  • PSS Packet Switched Streaming Service
  • the foregoing service establishment process is only an example, and the embodiment of the present invention is not limited thereto. The method for switching the streaming media service proposed by the embodiment of the present invention does not depend on the specific manner of service establishment.
  • the UE sends a handover request to the media server, requesting to change the content of the access, and the media server and the service control function entity process the request, specifically:
  • Step S214 The UE sends an RTSP OPTION message to the media server to query the fast handover capability information of the media server.
  • Step S215 The media server returns an RTSP response message, for example: an RTSP 200 OK message, carrying the fast handover capability information of the media server.
  • Step S214 and step S215 are optional steps.
  • the fast switching capability information of the media server may be: before the step S201, the media server corresponding to the content in the content menu is carried in the content menu of the user equipment.
  • the capability information is switched, or the fast switching capability information of the media server is carried in any SIP message sent by the service control function to the UE, and the service control function entity can also obtain the fast speed of the media server by using the RTSP OPTION message. Switch capability information.
  • Step S216 The UE sends an RTSP PLAY message to the media server, and carries the media content identifier that the UE wants to switch.
  • Step S217 The media server sends an authorization check request message to the service control function entity, and carries the media content identifier to be switched.
  • Step S218 The service control function entity performs an authorization check.
  • Step S219 The service control function entity returns an authorization check response message.
  • Step S220 The media server sends an RTSP response message to the UE, for example: a 200 OK message, and delivers the switched media content by using the media channel before switching.
  • Embodiment 1 of the present invention is directed to the case of GPRS access, but is also applicable to other IP access situations, such as LTE (Long Term Evolution), WLAN (Wireless Local Area Network), WiMAX ( Worldwide Interoperability for Microwave Access, CDMA (Code Division Multiple Access) 1X/D0.
  • LTE Long Term Evolution
  • WLAN Wireless Local Area Network
  • WiMAX Worldwide Interoperability for Microwave Access
  • CDMA Code Division Multiple Access
  • the user equipment sends a handover request to the media server by using the RTSP session between the user equipment and the media server before the handover, and the service control function entity performs an authorization check on the handover request, and finally the media server uses the media before the handover.
  • the channel sends the content requested in the handover request to the user equipment, and implements the switching of the streaming media service by using the fast switching capability of the real-time stream under the IMS architecture.
  • a user equipment sends a handover request by using a SIP session between the user equipment and the service control function entity before the handover, and finally utilizes The media channel before the handover transmits the content indicated in the handover request.
  • a SIP session between the user equipment and the service control function entity before the handover, and finally utilizes The media channel before the handover transmits the content indicated in the handover request.
  • Step S301 The UE sends a SIP INVITE message to the service control function entity through the P-CSCF and the IMS core through the WLAN network to request to establish a service.
  • the SIP INVITE message carries information such as a media content identifier, a UE side transceiver media IP address and port, and a codec.
  • Step S302 The service control function entity sends an RTSP establishment message to the media server to request to establish an RTSP session.
  • the RTSP setup message carries information such as a media content identifier, a UE side transceiver media IP address and port, and a codec.
  • Step S303 the media server accepts the request, returns an RTSP response message, for example: an RTSP 200 OK message, allocates an RTSP session identifier, and carries information such as a media server side transceiver medium IP address and port, and codec.
  • the media server may first perform an authorization check on whether the user can access the content indicated in the SIP INVITE message. After the check is passed, the media server accepts the RTSP setup request and returns to the RTSP. Response message.
  • Step S304 The service control function entity sends a SIP response message to the UE, for example, a SIP 183 response message, where the SIP response message carries information such as an IP address and port of the media server side, and a codec.
  • Step S305 the UE sends a SIP PRACK message to the service control function entity.
  • Step S306 the service control function entity sends a SIP response message to the UE, for example: SIP 200 OK message.
  • Steps S304 to S306 are optional steps.
  • Step S307 reserving transmission resources for media transmission of the UE.
  • Step S308 the service control function entity sends a SIP response message to the UE, for example: a SIP 200 OK message.
  • Step S309 the UE sends a SIPACK message to the service control function entity.
  • Step S310 The service control function entity sends an RTSP play message to the media server to request media play.
  • Step S311 The media server accepts the request, and returns an RTSP response message, for example: an RTSP 200 OK message, to start playing the media content.
  • an RTSP response message for example: an RTSP 200 OK message
  • the UE establishes a service with the network side, and the media server starts to send content to the UE.
  • the media server is a PSS server, but the media server may also be a media resource functional entity.
  • the foregoing service establishment process is only an example, and the embodiment of the present invention is not limited thereto.
  • the method for switching the streaming media service proposed by the embodiment of the present invention does not depend on the specific manner of service establishment.
  • the UE sends a handover request to the service control function entity, requesting to change the content of the access, and the service control function entity processes the handover request, specifically:
  • Step S312 The UE sends a SIP Re-INVITE message in the SIP session established in step S301, and carries information such as the media content identifier to be switched by the UE.
  • the content identifier to be switched by the UE may be carried through a header field or carried by a message body.
  • Step S313 The service control function entity sends an RTSP play message to the media server, and carries the media content identifier to be switched. Before the RTSP play message is sent, the service control function entity can access the content indicated in the SIP Re-INVITE message to the user. An authorization check is performed to send the message after checking that the user can access the content indicated in the SIP Re-INVITE message.
  • Step S314 the media server returns an RTSP response message, for example: an RTSP 200 OK message. If the service control function entity does not perform the authorization check in step S313, after receiving the RTSP play message sent by the service control function entity, the media server may first perform authorization check on whether the user can access the content indicated in the SIP Re-INVITE message. Check, after the check is passed, the media server accepts the RTSP play request again and returns an RTSP response message.
  • an RTSP response message for example: an RTSP 200 OK message.
  • Step S315 The service control function entity sends a SIP response message to the UE, for example: a SIP 200 OK message.
  • Step S316 The UE sends a SIP ACK message to the service control function entity.
  • the media server then communicates the switched media content to the UE using the media channel before the handover.
  • the media description information may be carried, the IP address and the port are kept unchanged, and the bandwidth control parameter is updated, in step S313.
  • the service control function entity sends an RTSP SETUP message to the media server, carrying the RTSP session identifier obtained in step S303, and the media server returns an RTSP 200 OK success response message to update the media channel before switching between the media server and the user equipment. bandwidth.
  • the processing after step S313 is performed. Thereby, the transmission channel before switching (without changing the IP address and port of the user equipment and the media server) and the RTSP session are realized, and the bandwidth of the media channel is adjusted according to the needs of the switched media content.
  • the second embodiment of the present invention is directed to the case of WLAN access, but is also applicable to other IP access situations, such as GPRS, SAE (Sytem Architecture Evolution) + LTE.
  • the user equipment sends a handover request by using a SIP session between the user equipment and the service control function entity before the handover, and the media server or the service function control entity performs an authorization check on the handover request, and finally the media server uses the switch before the switch.
  • the media channel sends the switched media content, thereby realizing the switching of the streaming media service by using the fast switching capability of the real-time stream under the IMS architecture, and transmitting the switched media content by using the media channel before switching improves the switching speed and User experience.
  • Embodiment 3 As shown in FIG. 4, it is a flowchart of Embodiment 3 of a method for switching a streaming media service according to the present invention.
  • a user equipment sends a handover request by using an RTSP session between the user equipment and the media server before switching, and finally uses the handover request.
  • the media channel sends the content indicated in the switch request. Specifically include:
  • Step S401 the UE establishes a service with the network side, and the media server starts to send the message to the UE.
  • the method for establishing a service between the UE and the network side is the same as that of the first embodiment or the second embodiment.
  • the method for switching the streaming media service according to the embodiment of the present invention does not depend on the specific manner of service establishment.
  • the UE sends a handover request to the media server, requesting to change the content of the access, and the media server and the service control function entity control the handover, specifically:
  • Step S402 The UE sends an RTSP play message to the media server, and carries the media content identifier that the UE wants to switch.
  • Step S403 The media server sends a message to the service control function entity to request the service authorization check information.
  • the service control function entity may also be a function storage data storage function entity for other services.
  • Step S404 The service control function entity returns a response message and carries the service authorization check information.
  • the service control function entity may also save the functional entity for other service subscription data.
  • Step S403 and step S404 are optional steps.
  • the service authorization check information may be directly sent to the media server by the service control function entity or other service subscription data storage function entity, and the pushing step may be performed at any time after the user subscribes to the service.
  • the business authorization check information can also be saved directly in the media server, and the media server does not have to be obtained from other functional entities.
  • Step S405 the media server performs an authorization check.
  • Step S406 The media server sends an RTSP response message, for example, an RTSP 200 OK message, to the UE, and sends the switched media stream.
  • an RTSP response message for example, an RTSP 200 OK message
  • the user equipment sends a handover request by using an RTSP session between the user equipment and the media server before the handover, and the media server performs an authorization check on the handover request, and finally the media server sends the handover request by using the media channel before the handover.
  • the content of the indication thereby realizing the switching of the streaming media service by using the fast switching capability of the real-time stream under the IMS architecture, and transmitting the switched media content by using the media channel before the switching improves the switching speed and the user experience.
  • Embodiment 4 As shown in FIG. 5, it is a flowchart of Embodiment 4 of a method for switching a streaming media service according to the present invention.
  • the media content before and after the switching is respectively switched on a different media server. The method is described, including:
  • Step S501 The UE sends a SIP INVITE message to the service control function entity through the P-CSCF and the IMS core through the GPRS network, requesting to establish a service.
  • the SIP INVITE message carries information such as a media content identifier, a UE side transceiver media IP address and port, and a codec.
  • Step S502 reserving transmission resources for media transmission of the UE.
  • Step S503 The service control function entity sends an RTSP setup message to the first media server, requesting to establish an RTSP session.
  • the RTSP setup message carries information such as a content identifier, a UE side transceiver medium IP address and port, and a codec.
  • Step S504 The first media server accepts the request, returns an RTSP response message, for example: an RTSP 200 OK message, allocates an RTSP session identifier, and carries information such as a media server side transceiver medium IP address and port, and codec.
  • an RTSP response message for example: an RTSP 200 OK message
  • allocates an RTSP session identifier for example: an RTSP 200 OK message
  • carries information such as a media server side transceiver medium IP address and port, and codec.
  • Step S505 The service control function entity sends a SIP response message to the UE, for example: a SIP 200 OK message.
  • Step S506 the UE sends a SIPACK message to the service control function entity.
  • Step S507 The service control function entity sends an RTSP play message to the first media server to request media play.
  • Step S508 the first media server accepts the request, and returns an RTSP response message, for example: an RTSP 200 OK message, to start sending the media content.
  • an RTSP response message for example: an RTSP 200 OK message
  • the UE establishes a service with the network side, and the media server starts to send the media content to the UE.
  • the media server is a PSS server, but the media server may also be a media resource functional entity.
  • the foregoing service establishment process is only an example, and the embodiment of the present invention is not limited thereto.
  • the method for switching the streaming media service proposed by the embodiment of the present invention does not depend on the specific manner of service establishment.
  • the UE sends a handover request to the service control function entity, requesting to change the content of the access, and the service control function entity processes the request, specifically:
  • Step S509 The UE sends an RTSP play message to the first media server, and carries the media content identifier that the UE wants to switch.
  • Step S510 the first media server is instructed to be able to provide an RTSP play message.
  • the second media server of the content sends an RTSP setup message.
  • Step S511 The second media server sends an authorization check request message to the service control function entity, and carries the media content identification information to be switched.
  • Step S512 The service control function entity performs an authorization check.
  • Step S513 the service control function entity returns an authorization check response message.
  • Step S514 the second media server returns an RTSP response message to the first media server, for example: an RTSP 200 OK message, and sends the content indicated in the RTSP play message to the first media server.
  • an RTSP 200 OK message for example: an RTSP 200 OK message
  • Step S515 the first media server sends a response message to the UE, for example: RTSP 200
  • the OK message is used to send the content indicated in the RTSP play message to the UE by using the media channel before the handover.
  • the first media server and the second media server may also transmit the content indicated in the handover request by using another manner, for example, the FTP mode, and is not limited to transmitting the content indicated in the handover request by using the RTSP mode.
  • the service control function entity when the media content before and after the handover is not in the same media server, the service control function entity performs an authorization check on the handover request, and the first media server acquires the handover from the second media server that has the switched media content.
  • the switched media content is sent to the UE by using the media channel before the handover, and the switching of the streaming media service under the IMS architecture is realized, thereby improving the switching speed and the user experience.
  • Embodiment 5 describes a method for switching media content before and after switching in different media servers, including:
  • Step S601 The UE establishes a service with the network side, and the media server starts to send content to the UE.
  • the specific manner of establishing a service between the UE and the network is the same as that of the fourth embodiment.
  • the embodiment of the present invention is not limited thereto.
  • the method for switching the streaming media service according to the embodiment of the present invention does not depend on the specific manner of service establishment.
  • Step S602 The UE sends an RTSP play message to the first media server, and carries the media content identifier that the UE wants to switch.
  • Step S603 The first media server sends a request message to the service control function entity to request authorization check information.
  • Step S604 The service control function entity returns a response message to the first media server, and carries the authorization check information.
  • Step S605 The first media server performs an authorization check.
  • Step S606 The first media server acquires, by using FTP, the content indicated in the RTSP play message to the second media server.
  • Step S607 The first media server sends an RTSP response message, for example, an RTSP 200 OK message, to the UE, and sends the content indicated in the RTSP play message to the UE by using the media channel before the handover.
  • an RTSP response message for example, an RTSP 200 OK message
  • the first media server when the media content before and after the handover is not in the same media server, the first media server performs an authorization check on the handover request, and acquires the switched media content from the second media server that has the switched media content.
  • the media channel before the handover is used to send the switched media content to the UE, and the handover is implemented in a manner of completely re-establishing the service, thereby improving the completion speed of the handover and the service experience of the user.
  • the interface between the service control function entity and the media server in the sixth embodiment is a SIP interface, not an RTSP interface, and specifically includes:
  • Step S701 The UE sends a SIP INVITE message to the service control function entity through the P-CSCF and the IMS core through the GPRS network, requesting to establish a service.
  • the SIP INVITE message carries information such as a media content identifier, a UE side transceiver media IP address and port, and a codec.
  • Step S702 reserving transmission resources for media transmission of the UE.
  • Step S703 The service control function entity sends a SIP INVITE message to the media server to request to establish a SIP session.
  • the SIP INVITE message carries information such as a content identifier, a UE-side transceiver media IP address and port, and a codec.
  • Step S704 the media server accepts the request and returns a SIP response message, for example: RTSP 200 OK message, assigning the RTSP session identifier, carrying the media server side to send and receive media IP address and port, and codec and other information.
  • a SIP response message for example: RTSP 200 OK message, assigning the RTSP session identifier, carrying the media server side to send and receive media IP address and port, and codec and other information.
  • Step S705 The service control function entity sends a SIP response message to the UE, for example: a SIP 200 OK message.
  • Step S706 The UE sends a SIPACK message to the service control function entity.
  • Step S707 The UE sends an RTSP play message to the media server to request media play.
  • Step S708 the media server accepts the request, and returns an RTSP response message, for example: an RTSP 200 OK message, to start sending the media content.
  • an RTSP response message for example: an RTSP 200 OK message
  • the UE establishes a service with the network side, and the media server starts to send the media content to the UE.
  • the media server is a PSS server, but the media server may also be a media resource functional entity.
  • the foregoing service establishment process is only an example, and the embodiment of the present invention is not limited thereto.
  • the method for switching the streaming media service proposed by the embodiment of the present invention does not depend on the specific manner of service establishment.
  • the UE sends a handover request to the service control function entity, requesting to change the content of the access, and the service control function entity processes the request, specifically:
  • Step S709 The UE sends an RTSP play message to the media server, and carries the media content identifier that the UE wants to switch.
  • Step S710 The media server sends an authorization check request message to the service control function entity, for example, a SIP INFO message, where the authorization check request message carries the identifier information of the media content to be switched.
  • the service control function entity for example, a SIP INFO message
  • Step S711 The service control function entity performs an authorization check.
  • Step S712 the service control function entity returns an authorization check response message.
  • Step S713 The media server sends a response message to the UE, for example, an RTSP 200 OK message, and sends the content indicated in the RTSP play message to the UE by using the media channel before the handover.
  • a response message for example, an RTSP 200 OK message
  • the service control function entity and the media server exchange information through the SIP interface, and the service control function entity performs authorization check on the handover request, and the media server sends the switched media content to the UE by using the media channel before the handover.
  • the flowchart of Embodiment 7 of the method for switching a streaming media service according to the present invention includes:
  • Step S801 Establish a session, and receive media content before the handover.
  • the process of establishing a session is the same as step S701 to step S708 in the sixth embodiment of the present invention.
  • the UE sends a handover request to the service control function entity, requesting to change the content of the access, and the service control function entity performs related processing, which may be:
  • Step S802 The UE sends an RTSP play message to the media server, and carries the media content identifier that the UE wants to switch.
  • Step S803 the media server sends a response message to the UE, for example: an RTSP 200 OK message, and sends the content indicated in the RTSP play message to the UE by using the media channel before the handover.
  • a response message for example: an RTSP 200 OK message
  • Step S804 the media server sends the handover information to the service control function entity.
  • the media server sends a response message to the service control function entity.
  • Step S805 The service control function entity performs statistics on user content access according to the switching information.
  • the media server sends the handover information to the service control function entity, so that the operator can perform content access statistics processing.
  • the operator can also complete, for example, handover statistics processing (statistical handover occurs). The frequency, the number of times the content is accessed and the time), or the processing of the user's switching to new content, and so on.
  • the flowchart of the eighth embodiment of the method for switching a streaming media service according to the present invention includes:
  • Step S901 Establish a session, and receive media content before the handover.
  • the process of establishing a session is the same as step S701 to step S708 in the sixth embodiment of the present invention.
  • Step S902 The UE sends an RTSP play message to the media server, and carries the media content identifier that the UE wants to switch.
  • the media content identifier may be an identifier of the entire content or a media component identifier.
  • the transmission of the media content to be switched by the UE requires a larger bandwidth than the transmission of the media content before the handover.
  • Step S903 The media server sends a response message to the UE, for example, an RTSP 200 OK message, and sends the content indicated in the RTSP play message to the UE by using the media channel before the handover.
  • a response message for example, an RTSP 200 OK message
  • Step S904 the media server sends the handover information to the service control function entity, where the handover information includes at least one or a combination of the following information: handover target content identifier, handover target component identifier information, user information, switched content identifier, and switched component identifier information. And replacement relationship information between media before and after switching, correspondence relationship information between components before and after switching, correspondence information between media channels and media components before switching, correspondence information between media channels and switched media components, and content or components The parameter information of the channel needs to be transmitted.
  • Step S905 The service control function entity generates a new media channel parameter (here, bandwidth), and sends a SIP Re-INVTIE message to the UE to carry the parameters, and may also carry the parameters through the SIP UPDATE message.
  • a new media channel parameter here, bandwidth
  • Step S906 the UE replies to the SIP 200 OK message to the service control function entity.
  • the service control function entity can control the media stream channel before the switching, and increase the bandwidth, so as to better support the media stream after the handover.
  • the media server sends the handover information to the service control function entity, so that the operator can modify the media stream channel and increase the bandwidth to support switching to higher quality (image quality, sound quality) content (usually required)
  • the operator can also support users to switch to more normal quality content, reduce the bandwidth of the media stream channel or other indicators (such as delay); and support the media components of the media content after switching (refers to any voice, video or data) increase or decrease, but need to increase or release the processing of the media stream channel.
  • the media server includes an adaptation function entity and a PSS server, which The time switch information is sent by the adaptation function entity to the service control function entity, specifically
  • the SIP INFO message carries the switching information.
  • the embodiment of the present invention is not limited thereto.
  • the handover information may be carried by the media server or the SIP RelNVITE or UPDATE message sent by the adaptation function entity, and the media channel is utilized by the SIP media renegotiation mechanism. Make changes.
  • the media server may be specifically implemented on an adaptation function entity and a PSS server, where the adaptation function entity respectively
  • the PSS server is connected to the UE, and the information that the UE interacts with the PSS server passes through the adaptation function entity, and the information that the PSS server interacts with the service control function entity passes through the adaptation function entity.
  • Step S1001 The UE sends a SIP INVITE message to the service control function entity through the IMS network through the GPRS network, requesting to establish a service.
  • Step S1002 The service control function entity sends a SIP INVITE message to the adaptation function entity.
  • Step S1003 The adaptation function entity sends an RTSP setup message to the PSS server to request to establish a session.
  • Step S1004 The PSS server sends an RTSP response message to the adaptation function entity.
  • Step S1005 The adaptation function entity returns a SIP response message to the service control function entity.
  • Step S1006 The service control function entity sends a SIP response message to the UE, for example: a SIP 200 OK message.
  • Step S1007 The UE sends a SIPACK message to the service control function entity.
  • Step S1008 The adaptation function entity sends an RTSP play message to the PSS server to request media play.
  • Step S1009 The PSS server sends an RTSP response message to the adaptation function entity.
  • the UE establishes a service with the network side, and the media server starts to send the media content to the UE, which can be sent through UDP (User Datagram Protocol) or TCP (Transport Control Protocol), but is not established.
  • RTSP channel between the UE and the adapter.
  • the UE sends a handover request to the service control function entity, requesting to change the content of the access, and the service control function entity performs related processing, specifically:
  • Step S1010 The UE sends a SIP Re-INVITE message to the service control function entity, requesting to switch to the CoD service content.
  • Step S1011 The service control function entity sends a SIP Re-INVITE message to the adaptation function entity.
  • Step S1012 The adaptation function entity returns a SIP response message, and carries an RTSP channel establishment information, such as an IP address, between the UE and the adapter.
  • Step S1013 The service control function entity sends a SIP response message to the UE.
  • Step S1014 The UE sends a SIPACK message to the service control function entity.
  • Step S1015 Establish a connection between the UE and the adaptation function entity to transmit the RTSP message.
  • Step S1016 The UE sends an RTSP play message to the PSS server via the adapted function entity, and carries the service content identifier to be switched by the UE.
  • Step S1017 The PSS server sends a response message to the UE via the adapted function entity. So far, the UE starts to receive the switched content.
  • the UE and the network side do not establish an RTSP channel before the handover, and the UE can establish an RTSP channel by using the SIP during the handover, and the UE can perform content switching through the RTSP.
  • the flowchart of the tenth embodiment of the method for switching a streaming media service according to the present invention includes:
  • Steps S1101 to S1109 are the same as steps S1001 to S1009.
  • the UE establishes a service with the network side, and the media server starts to send the media content to the UE.
  • the foregoing service establishment process is only an example, and the embodiment of the present invention is not limited thereto.
  • the UE sends a handover request to the service control function entity, requesting to change the content of the access, and the service control function entity performs related processing, specifically:
  • Step S1110 The UE sends a SIP Re-INVITE, SIP to the service control function entity.
  • UPDATE or SIP INFO message requesting to switch content, the above message includes at least one or a combination of the following information: handover target content identifier, handover target component identification information, user information, switched content identifier or component identification information, and replacement between media before and after switching
  • the relationship information the correspondence relationship information between the components before and after the handover, the correspondence relationship between the media channel and the media component before the handover, the correspondence relationship between the media channel and the switched media component, and the pre-switching media channel indication information.
  • Step S1111 The service control function entity sends a SIP Re-INVITE, SIP UPDATE or SIP INFO message to the adaptation function entity, where the message may carry one or a combination of the following information: handover target content identifier, handover target component identifier information, user information The content identifier or component identification information to be switched, the replacement relationship information between the media before and after the switching, the correspondence relationship information between the components before and after the switching, the correspondence relationship between the media channel and the media component before the switching, the media channel and the media component after the switching Correspondence information and reuse of pre-switch media channel indication information.
  • Step S1112 The adaptation function entity sends an RTSP play message to the PSS server, requesting to switch the content.
  • Step S1113 The PSS server sends an RTSP response message to the adaptation function entity.
  • the PSS server begins to provide the user with the switched valley by using the media delivery channel before the switch.
  • Step S1114 The adaptation function entity returns a SIP response message.
  • Step S1115 The service control function entity sends a SIP response message to the UE.
  • Step S1116 The UE sends a SIP ACK message to the service control function entity.
  • the UE requests the switching content through the SIP mode, and the adaptation function entity converts the SIP mode switching request into the RTSP mode switching request, so that the handover is completed.
  • the PSS server if the PSS server generates one or a combination of the media description information, the synchronization source information, and the successfully switched media component information, the information may be provided to the user equipment by the applicable function entity and/or the service control function entity.
  • FIG. 12 it is a structural diagram of a switching system of a streaming media service according to an embodiment of the present invention, including:
  • User equipment 121 configured to establish a service by using an IMS, receive media content, and send a handover request, the handover request carrying the requested media identifier;
  • the media server 122 is configured to transmit the media content to the user equipment 121, receive the handover request sent by the user equipment 121, or receive a handover request or indication sent by the service control function entity after receiving the handover request sent by the user equipment 121, and
  • the switched media content is transmitted to the user equipment 121 using the media channel of the pre-switch media content.
  • the media server 122 may be a PSS server, a media resource function entity, or a combination of a PSS server and an adaptation function entity.
  • the switching system of the streaming media service further includes: a service control function entity 123, configured to control the switching of the streaming media service, and perform the operation of adding, modifying, or releasing the control/participating media channel according to the switching information sent by the media server 122, or performing Statistics or billing processing.
  • a service control function entity 123 configured to control the switching of the streaming media service, and perform the operation of adding, modifying, or releasing the control/participating media channel according to the switching information sent by the media server 122, or performing Statistics or billing processing.
  • the switching system of the streaming media service may further include: a subscription data function entity 124, configured to save the media content subscription information of the user.
  • the subscription data functional entity 124 can be a separate entity or integrated into the service control functional entity 123 and/or the media server 122.
  • the switching system of the streaming media service may further include: a packet access network 125 and an IMS core 126,
  • the packet access network 125 includes: GSM (Global System For Mobile Communications) PS (Packet Switch), UMTS (Universal Mobile Telecommunications System) PS, WLAN, LTE, CDMA lx /DO or WiMAX.
  • GSM Global System For Mobile Communications
  • PS Packet Switch
  • UMTS Universal Mobile Telecommunications System
  • WLAN Long Term Evolution
  • LTE Long Term Evolution
  • CDMA lx /DO WiMAX
  • the IMS core 126 includes: a P-CSCF, an I-CSCF (Interrogating Call Server Control Function), an S-CSCF (Serving Call Server Control Function), or an HSS (Home Subscriber Server). , home ownership contract server, etc.
  • the switching system of the streaming media service further includes: interface A, interface A, interface B, interface C, interface D, and interface E,
  • Interface A is the interface between the user equipment and the P-CSCF in the IMS.
  • Interface A is the CSCF (Call Server Control Function) and the AS. The interface between them uses the SIP protocol.
  • the interface B is an interface between the service control function entity 123 and the media server 122, and can adopt the RTSP/SIP protocol.
  • the interface C is a media content transmission between the media server 122 and the user equipment 121 and an optional flow control interface.
  • the content delivery may be implemented by RTP (Real-time Transport Protocol) or RTCP (Real-time Transport Control Protocol).
  • RTP Real-time Transport Protocol
  • RTCP Real-time Transport Control Protocol
  • the real-time transmission control protocol), etc., the flow control can adopt the RTSP protocol.
  • the interface D is an interface between the contract data function entity 124 and the service control function entity 123, and a protocol such as DIAMETER (diameter) can be used.
  • the interface E is an interface between the subscription data function entity 124 and the media server 122, and a protocol such as DIAMETER can be used.
  • the media server 122 receives the handover request of the user equipment 121 or the handover request or the indication from the service control function entity 123, and sends the switched media content to the user equipment 121 through the media channel before the handover.
  • the service control function entity 123 is capable of performing service processing on the handover. Therefore, the media content after the switching is transmitted by using the media channel before the switching in the IMS architecture, and the media channel can be adjusted, the statistics or the switching is performed according to the need of transmitting the media after the switching, and the switching speed is improved. , user experience and network control of switching.
  • a structural diagram of a media server includes: a receiving module 131, configured to receive a handover request sent by the user equipment 121, or a receiving service control function entity 123 receives the information sent by the user equipment 121. After switching the request, the switching request or indication sent;
  • the sending module 132 is configured to send the switched media content to the user equipment 121 by using the media channel before switching.
  • the media server can also include:
  • the authorization checking module 133 is configured to perform an authorization check on the handover request received by the receiving module 131, or perform an authorization check by the proxy.
  • the authorization checking module 133 may include: an information obtaining sub-module 1331, configured to obtain authorization check information;
  • the authorization judgment sub-module 1332 is configured to determine, according to the authorization check information acquired by the information acquisition sub-module 1331, whether the user equipment has the authorization to obtain the media content requested in the handover request.
  • the media server may further include: a handover information interaction module 134, configured to transmit handover information to the service control function entity 123, where the handover information includes at least one or a combination of the following information: handover target content identifier, handover target component identifier information, User information, switched content identifier, switched component identification information, replacement relationship information between media before and after switching, correspondence relationship information between components before and after switching, correspondence information between media channels and media components before switching, media channel and after switching Correspondence information of the media component, and parameter information of the transmission channel required for the content or component.
  • a handover information interaction module 134 configured to transmit handover information to the service control function entity 123, where the handover information includes at least one or a combination of the following information: handover target content identifier, handover target component identifier information, User information, switched content identifier, switched component identification information, replacement relationship information between media before and after switching, correspondence relationship information between components before and after switching, correspondence information between media channels and media components before switching, media channel and after switching Correspondence
  • the media server, the receiving module 131 receives the switching request of the user equipment 121, and the sending module 132 sends the switched media content to the user equipment by using the media channel before the switching, thereby implementing the fast switching capability of the real-time stream under the IMS architecture.
  • the switching of the service improves the switching speed and the user experience as compared with the way of completely re-establishing the service.
  • the handover information is sent to the service control function entity 123, so that the service control function entity can perform channel adjustment, statistics, or accounting processing on the handover, thereby improving the network's control capability for handover.
  • FIG. 14 it is a structural diagram of a service control function entity according to an embodiment of the present invention, which includes:
  • the receiving module 141 is configured to receive a handover request sent by the user equipment 121.
  • the sending module 142 is configured to send a handover request message to the media server 122, requesting or instructing the media server 122 to send the switched to the user equipment 121 by using the media channel before the handover.
  • Media content
  • the information notification module 143 is configured to send, to the user equipment 142, one or a combination of media description information generated by the media server 122, synchronization source information, and successfully switched media component information.
  • the present invention can be implemented by hardware, or can be added with necessary general hardware by software.
  • the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.).
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

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  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

一种流媒体业务的切换方法、 系统和装置 本申请要求于 2008 年 3 月 28 日提交中国专利局， 申请号为 200810090355.9, 发明名称为 "一种流媒体业务的切换方法、 系统和 装置" 的中国专利申请， 以及于 2008年 8月 11 日提交中国专利局， 申请号为 200810147358.1 ,发明名称为 "一种流媒体业务的切换方法、 系统和装置"的中国专利申请的优先权， 其全部内容通过引用结合在 本申请中。 技术领域
本发明实施例涉及网络通信技术领域，特别涉及一种流媒体业务 的切换方法、 系统和装置。 背景技术
流媒体业务是从因特网上发展起来的一种多媒体应用，指使用流 方式在网络上传输多媒体文件， 包括音频、 视频和动画等。 移动流媒 体业务就是流媒体技术在移动网络和终端上的应用，主要是利用目前 2.5G或 3G ( Third Generation, 第三代移动通信）的移动通信网， 为手 机终端提供音频、视频的流媒体服务。 移动流媒体业务的内容包括新 闻资讯、 影视、 MTV ( Music Television, 音乐电视） 、 体育、 教育、 行业和专项应用等多种形式。
随着第三代移动通信技术的逐步成熟，将移动流媒体技术引入移 动增值业务， 已经成为目前全球范围内移动业务研究的热点之一。 目 前， 3GPP( Third Generation Partnership Project,第三代合作伙伴计划）， 3GPP2等标准化组织早已经开展了移动流媒体的应用研究工作， 并已 经制定了相应的标准。
PSS ( Packet Switched Streaming Service, 包交换流业务）是 3GPP 定义的一种向用户提供流媒体业务的技术， PSS网络架构中主要包括 移动终端和网络侧的 PSS服务器， 以 RTSP ( Real Time Streaming Protocol , 实时流协议） 为基础。 PSS技术定义了一种 fast content switching (快速内容切换）技术， 假设用户已经建立好 RTSP会话， 正在观看一个内容或节目， 如果用户要改变当前观看的内容， 不必发 送 RTSP SETUP (建立）消息重新建立 RTSP会话， 而只需要发送一个 特殊的 RTSP PLAY (播放） 消息， 在该 RTSP PLAY消息中携带想要 观看的新内容的标识， 就可以利用原有的媒体通道发送切换后的内 容， 从而省去了重新协商媒体的处理， 提高了切换的性能。
IMS ( IP Multimedia Subsystem, IP多媒体子系统）是 3GPP定义 的 IP多媒体子系统， 以 SIP ( Session Initiation Protocol,会话初始协议） 为基本业务控制协议， 提供会话（业务）控制功能。 IMS提供了一个 业务平台， 不同的 AS ( Application Server, 应用服务器）可以提供不 同的业务， 用户设备可通过 IMS从 AS获取业务。 IMS会话若要建立媒 体通道， 需要资源预留以提供可靠的传输质量， 而资源预留通常需要 相对比较长的时间。
现在， 3GPP标准组织最新成立新的研究项目， 研究基于 IMS和 PSS的移动 IPTV ( Internet Protocol Television, 网络电视）业务， 要把 PSS和 IMS结合起来提供 IPTV业务。
在实现本发明的过程中， 发明人发现没有现有技术解决如何在 IMS架构下， 利用 PSS技术进行业务切换的问题， 不能在 IMS架构 下通过 PSS为用户提供快速的切换功能来提高用户的业务体验。 发明内容
本发明实施例提供一种流媒体业务的切换方法、 系统和装置， 以 实现在 IMS架构下利用实时流快速切换能力进行流媒体业务的切换。
为达到上述目的，本发明实施例一方面提供一种流媒体业务的切 换方法，用于在 IP多媒体子系统 IMS架构下进行流媒体业务的切换， 包括：
接收切换请求， 所述切换请求携带请求的媒体标识； 利用切换前的媒体通道向所述用户设备发送切换后的媒体内容。 另一方面， 本发明实施例还提供一种流媒体业务的切换系统， 包 括：
用户设备， 用于发送切换请求；
媒体服务器，用于接收所述用户设备直接发送的切换请求，或者， 接收业务控制功能实体在接收到用户设备发送的切换请求后，发送的 切换请求或指示，并利用切换前的媒体通道向所述用户设备发送切换 后的媒体内容。
再一方面， 本发明实施例还提供一种媒体服务器， 包括： 接收模块， 用于接收用户设备直接发送的切换请求， 或者， 接收 业务控制功能实体在接收到用户设备发送的切换请求；
发送模块，用于利用切换前的媒体通道向所述用户设备发送切换 后的媒体内容。
与现有技术相比， 本发明实施例具有以下优点： 本发明实施例提 供了一种在 IMS架构下利用 PSS的快速切换能力进行流媒体业务的 切换方法， 实现了在 IMS 架构下利用切换前的媒体通道传送切换后 的媒体内容，同时在切换时能够按切换后传送媒体的需要进行媒体通 道的调整， 对切换进行统计或计费， 提高了切换速度、 用户的体验度 以及网络对切换的控制能力。 附图说明
图 1为本发明实施例流媒体业务的切换方法的流程图；
图 2为本发明流媒体业务的切换方法实施例一的流程图； 图 3为本发明流媒体业务的切换方法实施例二的流程图； 图 4为本发明流媒体业务的切换方法实施例三的流程图； 图 5为本发明流媒体业务的切换方法实施例四的流程图； 图 6为本发明流媒体业务的切换方法实施例五的流程图； 图 7为本发明流媒体业务的切换方法实施例六的流程图； 图 8为本发明流媒体业务的切换方法实施例六的流程图； 图 9为本发明流媒体业务的切换方法实施例七的流程图； 图 10为本发明流媒体业务的切换方法实施例八的流程图； 图 11为本发明流媒体业务的切换方法实施例九的流程图； 图 12为本发明实施例流媒体业务的切换系统的结构图； 图 13为本发明实施例媒体服务器的结构图；
图 14为本发明实施例业务控制功能实体的结构图。 具体实施方式
在基于 IMS的移动流媒体业务中， 用户需要切换当前观看的内 容， 并且切换的速度越快， 越有利于提高用户的感受。 本发明实施例 提出了一种流媒体业务的切换方法， 使用户可以在基于 IMS的移动流 媒体业务中切换当前观看的内容， 并且提高了切换速度。
如图 1所示， 为本发明实施例流媒体业务的切换方法的流程图， 包括：
步骤 S101 , 接收用户设备发送的切换请求， 该切换请求携带请 求的媒体标识。
在接收用户设备发送的切换请求之前，用户设备首先需要获取媒 体服务器的能力信息，该能力信息为媒体服务器是否具备利用切换前 的 RTSP会话进行切换的能力信息。 当媒体服务器具备利用切换前的 RTSP会话进行切换的能力时， 用户设备才向该媒体服务器发送切换 请求。
其中， 用户设备获取媒体服务器的能力信息具体可以为： 通过网络侧提供的内容菜单或内容列表，获取媒体服务器的能力 信息； 或者，
通过业务控制功能实体获取该媒体服务器的能力信息； 或者， 建立用户设备与媒体服务器间的 RTSP会话， 用户设备从媒体服 务器处直接获取该媒体服务器的能力信息。
在接收到用户设备发送的切换请求之后的任意时刻，媒体服务器 向业务控制功能实体发送通知消息，以通知该业务控制功能实体切换 的发生。
在接收到切换请求之后，媒体服务器可以对切换请求进行授权检 查。 具体可以为获取授权检查信息， 然后根据获取的授权检查信息判 断来自所述用户设备的切换请求是否能够被授权。
其中， 获取授权检查信息可以为： 从保存授权检查信息的功能实 体处获取授权检查信息，或者，在媒体服务器中配置该授权检查信息， 从该媒体服务器中获取授权检查信息。
对切换请求进行授权检查还可以为：向业务控制功能实体发送授 权检查请求， 请求该业务控制功能实体对切换请求进行授权检查。 若 采用这个方法，则通知该业务控制功能实体切换的发生的处理可以与 向业务控制功能实体发送授权检查请求的处理同时进行。
步骤 S102, 利用切换前的媒体通道向用户设备发送切换后的媒 体内容。
在利用切换前的媒体通道向用户设备发送切换后的媒体内容之 前， 媒体服务器根据该切换请求对媒体通道进行调整。 具体可以为：
( 1 )修改媒体通道。 若切换后的媒体内容对媒体通道的要求不 同， 则根据新的要求对切换后的媒体通道进行修改， 所述要求包括但 不限于 QoS参数， 比如带宽、 抖动、 时延或丟包率。
( 2 )新增媒体通道。 若切换后的媒体内容中的媒体流多于切换 前的， 则新增媒体通道以传递切换后多出的媒体流。
( 3 )释放媒体通道。 若切换后的媒体内容中的媒体流少于切换 前的， 则释放多出的媒体通道。
( 4 )若切换前后， 所需媒体通道相同， 则无需所述调整。
则利用切换前的媒体通道向用户设备发送切换后的媒体内容具 体可以为：
当切换前后的媒体内容在同一媒体服务器中时，利用切换前的媒 体通道向用户设备发送切换后的媒体内容。
根据授权检查的结果通过切换前的媒体通道向用户设备发送切 换后的媒体内容还可以为：
另夕卜， 当向用户设备提供切换前的媒体内容的第一媒体服务器中 没有切换后的媒体内容时，第一媒体服务器从包含切换后的媒体内容 的第二媒体服务器处获取切换后的媒体内容，然后第一媒体服务器通 过切换前的媒体通道向用户设备发送获取的切换后的媒体内容。
其中，第一媒体服务器从包含切换后的媒体内容的第二媒体服务 器处获取切换后的媒体内容具体可以为：
第一媒体服务器向第二媒体服务器发送 RTSP会话建立请求， 建 立 RTSP会话， 通过 RTSP会话获取切换后的媒体内容； 或者，
第一媒体服务器通过 FTP ( File Transfer Protocol,文件传输协议 ) 从第二媒体服务器处获取切换后的媒体内容。
在第一媒体服务器从包含切换后的媒体内容的第二媒体服务器 处获取切换后的媒体内容之前， 还要对切换请求进行授权检查。
具体可以为：
第二媒体服务器请求业务控制功能实体对切换请求进行授权检 查； 或者，
第一媒体服务器向业务控制功能实体请求授权检查信息，根据授 权检查信息判断来自所述用户设备的切换请求是否能够被授权。
上述流媒体业务的切换方法， 实现了在 IMS 架构下利用实时流 的快速切换能力进行流媒体业务的切换，并且实现了利用切换前的媒 体通道传送切换后的媒体内容， 提高了切换速度和用户的体验度。
如图 2 所示， 为本发明流媒体业务的切换方法实施例一的流程 图， 实施例一中， 用户设备通过切换前该用户设备与媒体服务器间的 RTSP会话发送切换请求， 最终利用切换前的媒体通道发送切换请求 中指示的内容。 具体包括：
步骤 S201 , UE( User Equipment,用户设备）通过 GPRS( Gerneral Packer Radio Service,通用无线分组业务）网络，经 P-CSCF( Proxy Call Server Control Function, 代理呼叫服务器控制功能）、 IMS核向业务 控制功能实体发送 SIP INVITE (邀请） 消息， 请求建立业务。 该 SIP INVITE消息携带媒体内容标识、 UE侧收发媒体的 IP地址和端 口以及编解码等信息。
步骤 S202, 业务控制功能实体向媒体服务器发送 RTSP建立消 息， 请求建立 RTSP会话， 该 RTSP建立消息携带媒体内容标识、 UE 侧收发媒体的 IP地址和端口以及编解码等信息。
步骤 S203,媒体服务器接受请求，返回 RTSP响应消息例如： 200 OK,分配 RTSP会话标识。 同时该 RTSP响应消息携带媒体服务器侧 收发媒体的 IP地址和端口以及编解码等信息。
步骤 S204,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 183响应消息。该 SIP响应消息携带媒体服务器侧收发媒体的 IP地址 和端口以及编解码等信息。
步骤 S205, UE向业务控制功能实体发送 SIP PRACK消息。 步骤 S206,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。
步骤 S207, 为 UE的媒体传送预留传输资源。
步骤 S208, UE向业务控制功能实体发送 SIP UPDATE (更新） 消息。
步骤 S209,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。其中，步骤 S204~步骤 S206以及步骤 S208和步骤 S209 为可选步骤， 步骤 S207可在步骤 S201之后任意时刻执行。
步骤 S210,业务控制功能实体向 UE发送 SIP响应消息例如： 200 OK消息。
步骤 S211 , UE 向业务控制功能实体发送 SIP ACK ( Acknowledgement , 确认) 消息。
步骤 S212,业务控制功能实体向媒体服务器发送 RTSP PLAY(播 放） 消息， 请求媒体播放。
步骤 S213, 媒体服务器接受请求， 返回 RTSP响应消息例如： RTSP 200 OK消息， 开始媒体内容的发送。 其中， 步骤 S212和步骤 S213也可在用户设备与媒体服务器间进行。 至此， UE与网络侧建立了业务， 媒体服务器开始向 UE发送内 容。 在本实施例中， 媒体服务器为 PSS ( Packet Switched Streaming Service, 包交换流业务）服务器， 但该媒体服务器也可以是一个媒体 资源功能实体。 上述业务建立过程仅是一种示例， 本发明实施例并不 局限于此，本发明实施例提出的流媒体业务的切换方法不依赖于业务 建立的具体方式。
然后， UE向媒体服务器发送切换请求， 要求更改访问的内容， 媒体服务器和业务控制功能实体处理这一请求， 具体为：
步骤 S214, UE向媒体服务器发送 RTSP OPTION消息， 询问媒 体服务器的快速切换能力信息。
步骤 S215 , 媒体服务器返回 RTSP响应消息例如： RTSP 200 OK 消息， 携带该媒体服务器的快速切换能力信息。 其中步骤 S214和步 骤 S215为可选步骤，获取媒体服务器的快速切换能力信息也可以为： 在步骤 S201之前， 在给用户设备的内容菜单中携带该内容菜单中的 内容所对应的媒体服务器的快速切换能力信息， 或者， 在由业务控制 功能发往 UE的任何一条 SIP消息中携带媒体服务器的快速切换能力 信息， 而业务控制功能实体也同样可以通过 RTSP OPTION消息向媒 体服务器获取该媒体服务器的快速切换能力信息。
步骤 S216, UE向媒体服务器发送 RTSP PLAY消息， 携带 UE 要切换的媒体内容标识。
步骤 S217, 媒体服务器向业务控制功能实体发送授权检查请求 消息， 携带要切换的媒体内容标识。
步骤 S218, 业务控制功能实体进行授权检查。
步骤 S219, 业务控制功能实体返回授权检查响应消息。
步骤 S220,媒体服务器向 UE发送 RTSP响应消息例如： 200 OK 消息， 并利用切换前的媒体通道传递切换后的媒体内容。
本发明实施例一针对 GPRS接入的情形， 但同样适用于其它 IP 接入的情形， 例如 LTE ( Long Term Evolution, 长期演进）、 WLAN ( Wireless Local Area Network, 无线局 i或网）， WiMAX ( Worldwide Interoperability for Microwave Access , 微波存取全球互通 )或 CDMA ( Code Division Multiple Access , 码分多址） 1X/D0。
在本发明实施例一中，用户设备通过切换前该用户设备与媒体服 务器间的 RTSP会话向媒体服务器发送切换请求， 业务控制功能实体 对该切换请求进行授权检查，最终媒体服务器利用切换前的媒体通道 将切换请求中请求的内容发送给用户设备， 实现了在 IMS 架构下利 用实时流的快速切换能力进行流媒体业务的切换。
如图 3 所示， 为本发明流媒体业务的切换方法实施例二的流程 图， 实施例二中， 用户设备通过切换前该用户设备与业务控制功能实 体间的 SIP会话发送切换请求，最终利用切换前的媒体通道发送切换 请求中指示的内容。 具体包括：
步骤 S301 , UE通过 WLAN网络， 经 P-CSCF、 IMS核向业务控 制功能实体发送 SIP INVITE消息， 请求建立业务。 该 SIP INVITE消 息携带媒体内容标识、 UE侧收发媒体 IP地址和端口以及编解码等信 息。
步骤 S302, 业务控制功能实体向媒体服务器发送 RTSP建立消 息， 请求建立 RTSP会话。 该 RTSP建立消息携带媒体内容标识、 UE 侧收发媒体 IP地址和端口以及编解码等信息。
步骤 S303, 媒体服务器接受请求， 返回 RTSP响应消息例如： RTSP 200 OK消息， 分配 RTSP会话标识， 携带媒体服务器侧收发媒 体 IP地址和端口以及编解码等信息。 在接收到业务控制功能实体发 送的 RTSP建立消息之后，媒体服务器可以先对用户是否能够访问 SIP INVITE消息中指示的内容进行授权检查， 在检查通过后， 媒体服务 器再接受该 RTSP建立请求， 返回 RTSP响应消息。
步骤 S304,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 183响应消息，该 SIP响应消息携带媒体服务器侧收发媒体 IP地址和 端口以及编解码等信息。
步骤 S305, UE向业务控制功能实体发送 SIP PRACK消息。 步骤 S306,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。 其中， 步骤 S304~步骤 S306为可选步骤。
步骤 S307, 为 UE的媒体传送预留传输资源。
步骤 S308,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。
步骤 S309, UE向业务控制功能实体发送 SIPACK消息。
步骤 S310, 业务控制功能实体向媒体服务器发送 RTSP播放消 息， 请求媒体播放。
步骤 S311 , 媒体服务器接受请求， 返回 RTSP响应消息例如： RTSP 200 OK消息， 开始媒体内容的播放。
至此， UE与网络侧建立业务， 媒体服务器开始向 UE发送内容。 在本实施例中，媒体服务器为 PSS服务器，但该媒体服务器也可以是 一个媒体资源功能实体。 上述业务建立过程仅是一种示例， 本发明实 施例并不局限于此，本发明实施例提出的流媒体业务的切换方法不依 赖于业务建立的具体方式。
然后， UE向业务控制功能实体发送切换请求， 要求更改访问的 内容， 业务控制功能实体处理该切换请求， 具体为：
步骤 S312 , UE 在步骤 S301 建立的 SIP 会话中发送 SIP Re-INVITE (重邀请 )消息， 携带 UE要切换的媒体内容标识等信息。 UE要切换的内容标识可以通过一个头域携带， 也可以通过消息体携 带。
步骤 S313, 业务控制功能实体向媒体服务器发送 RTSP播放消 息， 携带要切换的媒体内容标识， 在发送该 RTSP播放消息前， 业务 控制功能实体可对用户是否能够访问 SIP Re-INVITE消息中指示的内 容进行授权检查，在检查用户能够访问 SIP Re-INVITE消息中指示的 内容之后才发送该消息。
步骤 S314, 媒体服务器返回 RTSP响应消息例如： RTSP 200 OK 消息。 若业务控制功能实体不在步骤 S313中进行授权检查， 在接收 到业务控制功能实体发送的 RTSP播放消息之后， 媒体服务器可以先 对用户是否能够访问 SIP Re-INVITE 消息中指示的内容进行授权检 查，在检查通过后，媒体服务器再接受该 RTSP播放请求，返回 RTSP 响应消息。
步骤 S315,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。
步骤 S316, UE向业务控制功能实体发送 SIP ACK消息。 然后媒 体服务器利用切换前的媒体通道向 UE传递切换后的媒体内容。
在本发明实施例二中，若切换后的内容在传送带宽上有不同的需 求， 那么在步骤 S312中， 可携带媒体描述信息， 保持 IP地址和端口 不变， 更新带宽控制参数， 在步骤 S313前， 由业务控制功能实体向 媒体服务器发送 RTSP SETUP消息， 携带步骤 S303中获得的 RTSP 会话标识， 媒体服务器返回 RTSP 200 OK成功响应消息， 以更新媒 体服务器与用户设备间切换前的的媒体通道的带宽。 完成该处理后， 再执行步骤 S313后的处理。 从而实现了利用切换前的传送通道（不 改变用户设备和媒体服务器的收发 IP地址和端口）和 RTSP会话， 根据切换后的媒体内容的需要调整媒体通道的带宽。
本发明实施例二针对 WLAN接入的情形， 但同样适用于其它 IP 接入的情形， 例如 GPRS、 SAE ( Sytem Architecture Evolution, 系统 构架演进） +LTE。
在本发明实施例二中，用户设备通过切换前该用户设备与业务控 制功能实体间的 SIP会话发送切换请求，媒体服务器或业务功能控制 实体对该切换请求进行授权检查，最终媒体服务器利用切换前的媒体 通道发送切换后的媒体内容， 从而实现了在 IMS 架构下利用实时流 的快速切换能力进行流媒体业务的切换，并且利用切换前的媒体通道 发送切换后的媒体内容提高了切换的速度和用户的体验度。
如图 4 所示， 为本发明流媒体业务的切换方法实施例三的流程 图， 实施例三中， 用户设备通过切换前该用户设备与媒体服务器间的 RTSP会话发送切换请求， 最终利用切换前的媒体通道发送切换请求 中指示的内容。 具体包括：
步骤 S401 , UE与网络侧建立业务， 媒体服务器开始向 UE发送 内容。 UE与网络侧建立业务的具体方式同实施例一或实施例二， 但 本发明实施例并不局限于此，本发明实施例提出的流媒体业务的切换 方法不依赖于业务建立的具体方式。
然后， UE向媒体服务器发送切换请求， 要求更改访问的内容， 媒体服务器和业务控制功能实体控制切换， 具体为：
步骤 S402, UE向媒体服务器发送 RTSP播放消息， 携带 UE要 切换的媒体内容标识。
步骤 S403 , 媒体服务器向业务控制功能实体发送消息， 请求业 务授权检查信息。 其中， 该业务控制功能实体也可以为其它业务签约 数据保存功能实体。
步骤 S404, 业务控制功能实体返回响应消息， 携带业务授权检 查信息。 其中， 该业务控制功能实体也可以为其它业务签约数据保存 功能实体。
步骤 S403和步骤 S404为可选步骤，该业务授权检查信息可以由 业务控制功能实体或其它业务签约数据保存功能实体直接向媒体服 务器推送， 该推送步骤可以在用户签约业务后的任意时刻执行， 该业 务授权检查信息也可直接保存在媒体服务器中，媒体服务器不必从其 它功能实体获取。
步骤 S405, 媒体服务器进行授权检查。
步骤 S406,媒体服务器向 UE发送 RTSP响应消息例如： RTSP 200 OK消息， 并发送切换后的媒体流。
在本发明实施例三中，用户设备通过切换前该用户设备与媒体服 务器间的 RTSP会话发送切换请求， 媒体服务器对该切换请求进行授 权检查，最终媒体服务器利用切换前的媒体通道发送切换请求中指示 的内容， 从而实现了在 IMS 架构下利用实时流的快速切换能力进行 流媒体业务的切换，并且利用切换前的媒体通道发送切换后的媒体内 容提高了切换的速度和用户的体验度。
如图 5 所示， 为本发明流媒体业务的切换方法实施例四的流程 图，实施例四对切换前后的媒体内容分别在不同媒体服务器的切换方 法进行描述， 具体包括：
步骤 S501 , UE通过 GPRS网络， 经 P-CSCF、 IMS核向业务控 制功能实体发送 SIP INVITE消息， 请求建立业务。 该 SIP INVITE消 息携带媒体内容标识、 UE侧收发媒体 IP地址和端口以及编解码等信 息。
步骤 S502, 为 UE的媒体传送预留传输资源。
步骤 S503,业务控制功能实体向第一媒体服务器发送 RTSP建立 消息， 请求建立 RTSP会话。 该 RTSP建立消息携带内容标识、 UE 侧收发媒体 IP地址和端口以及编解码等信息。
步骤 S504,第一媒体服务器接受请求，返回 RTSP响应消息例如： RTSP 200 OK消息， 分配 RTSP会话标识， 携带媒体服务器侧收发媒 体 IP地址和端口以及编解码等信息。
步骤 S505,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。
步骤 S506, UE向业务控制功能实体发送 SIPACK消息。
步骤 S507,业务控制功能实体向第一媒体服务器发送 RTSP播放 消息， 请求媒体播放。
步骤 S508,第一媒体服务器接受请求，返回 RTSP响应消息例如： RTSP 200 OK消息， 开始媒体内容的发送。
至此， UE与网络侧建立业务， 媒体服务器开始向 UE发送媒体 内容。 在本实施例中，媒体服务器为 PSS服务器， 但该媒体服务器也 可以是一个媒体资源功能实体。 上述业务建立过程仅是一种示例， 本 发明实施例并不局限于此，本发明实施例提出的流媒体业务的切换方 法不依赖于业务建立的具体方式。
然后， UE向业务控制功能实体发送切换请求， 要求更改访问的 内容， 业务控制功能实体处理这一请求， 具体为：
步骤 S509, UE 向第一媒体服务器发送 RTSP播放消息， 携带 UE要切换的媒体内容标识。
步骤 S510,第一媒体服务器向能够提供 RTSP播放消息中所指示 的内容的第二媒体服务器发送 RTSP建立消息。
步骤 S511 , 第二媒体服务器向业务控制功能实体发送授权检查 请求消息， 携带要切换的媒体内容标识信息。
步骤 S512, 业务控制功能实体进行授权检查。
步骤 S513, 业务控制功能实体返回授权检查响应消息。
步骤 S514,第二媒体服务器向第一媒体服务器返回 RTSP响应消 息例如： RTSP 200 OK消息， 向第一媒体服务器发送 RTSP播放消息 中所指示的内容。
步骤 S515,第一媒体服务器向 UE发送响应消息例如： RTSP 200
OK消息， 并利用切换前的媒体通道向 UE发送 RTSP播放消息中指 示的内容。
在实施例四中，第一媒体服务器与第二媒体服务器还可以采用其 它方式例如： FTP方式传送切换请求中指示的内容， 并不仅限于使用 RTSP方式传送切换请求中指示的内容。
在本发明实施例四中， 当切换前后的媒体内容不在同一媒体服务 器时， 业务控制功能实体对切换请求进行授权检查， 第一媒体服务器 从具有切换后的媒体内容的第二媒体服务器处获取切换后的媒体内 容， 利用切换前的媒体通道向 UE发送切换后的媒体内容， 实现了在 IMS架构下进行流媒体业务的切换，提高了切换的速度和用户的体验 度。
如图 6 所示， 为本发明流媒体业务的切换方法实施例五的流程 图，实施例五对切换前后的媒体内容分别在不同媒体服务器的切换方 法进行描述， 具体包括：
步骤 S601 , UE与网络侧建立业务， 媒体服务器开始向 UE发送 内容。 UE与网络侧建立业务的具体方式同实施例四， 但本发明实施 例并不局限于此，本发明实施例提出的流媒体业务的切换方法不依赖 于业务建立的具体方式。
UE向媒体服务器发送切换请求， 要求更改访问的内容， 媒体服 务器和业务控制功能实体处理切换， 具体为： 步骤 S602, UE 向第一媒体服务器发送 RTSP播放消息， 携带 UE要切换的媒体内容标识。
步骤 S603, 第一媒体服务器向业务控制功能实体发送请求消息， 请求授权检查信息。
步骤 S604, 业务控制功能实体向第一媒体服务器返回响应消息， 携带授权检查信息。
步骤 S605 , 第一媒体服务器进行授权检查。
步骤 S606, 第一媒体服务器通过 FTP 向第二媒体服务器获取 RTSP播放消息中指示的内容。
步骤 S607,第一媒体服务器向 UE发送 RTSP响应消息例如： RTSP 200 OK消息，并利用切换前的媒体通道向 UE发送 RTSP播放消息中 指示的内容。
在本发明实施例五中， 当切换前后的媒体内容不在同一媒体服务 器时， 第一媒体服务器对切换请求进行授权检查， 从具有切换后的媒 体内容的第二媒体服务器处获取切换后的媒体内容，利用切换前的媒 体通道向 UE发送切换后的媒体内容， 相对于通过完全重新建立业务 的方式来实现切换， 提高了切换的完成速度， 以及用户的业务体验。
如图 7 所示， 为本发明流媒体业务的切换方法实施例六的流程 图， 实施例六中业务控制功能实体与媒体服务器间的接口为 SIP接 口， 而非 RTSP接口， 具体包括：
步骤 S701 , UE通过 GPRS网络， 经 P-CSCF、 IMS核向业务控 制功能实体发送 SIP INVITE消息， 请求建立业务。 该 SIP INVITE消 息携带媒体内容标识、 UE侧收发媒体 IP地址和端口以及编解码等信 息。
步骤 S702, 为 UE的媒体传送预留传输资源。
步骤 S703, 业务控制功能实体向媒体服务器发送 SIP INVITE消 息， 请求建立 SIP会话。 该 SIP INVITE消息携带内容标识、 UE侧收 发媒体 IP地址和端口以及编解码等信息。
步骤 S704,媒体服务器接受请求，返回 SIP响应消息例如： RTSP 200 OK消息， 分配 RTSP会话标识， 携带媒体服务器侧收发媒体 IP 地址和端口以及编解码等信息。
步骤 S705,业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。
步骤 S706, UE向业务控制功能实体发送 SIPACK消息。
步骤 S707, UE向媒体服务器发送 RTSP播放消息， 请求媒体播 放。
步骤 S708, 媒体服务器接受请求， 返回 RTSP响应消息例如： RTSP 200 OK消息， 开始媒体内容的发送。
至此， UE与网络侧建立业务， 媒体服务器开始向 UE发送媒体 内容。 在本实施例中，媒体服务器为 PSS服务器， 但该媒体服务器也 可以是一个媒体资源功能实体。 上述业务建立过程仅是一种示例， 本 发明实施例并不局限于此，本发明实施例提出的流媒体业务的切换方 法不依赖于业务建立的具体方式。
然后， UE向业务控制功能实体发送切换请求， 要求更改访问的 内容， 业务控制功能实体处理这一请求， 具体为：
步骤 S709, UE向媒体服务器发送 RTSP播放消息， 携带 UE要 切换的媒体内容标识。
步骤 S710, 媒体服务器向业务控制功能实体发送授权检查请求 消息例如： SIP INFO 消息， 该授权检查请求消息携带要切换的媒体 内容的标识信息。
步骤 S711 , 业务控制功能实体进行授权检查。
步骤 S712, 业务控制功能实体返回授权检查响应消息。
步骤 S713, 媒体服务器向 UE发送响应消息例如： RTSP 200 OK 消息， 并利用切换前的媒体通道向 UE发送 RTSP播放消息中指示的 内容。
在本发明实施例六中， 业务控制功能实体和媒体服务器通过 SIP 接口进行信息交互， 业务控制功能实体对切换请求进行授权检查， 媒 体服务器利用切换前的媒体通道向 UE发送切换后的媒体内容， 实现 了在 IMS 架构下进行流媒体业务的切换， 相对于通过完全重新建立 业务的方式来实现切换， 提高了切换的速度和用户的体验度。
如图 8 所示， 为本发明流媒体业务的切换方法实施例七的流程 图， 具体包括：
步骤 S801 , 建立会话， 接收切换前的媒体内容。 其中， 建立会 话的过程同本发明实施例六中的步骤 S701~步骤 S708。
然后， UE向业务控制功能实体发送切换请求， 要求变更访问的 内容， 业务控制功能实体进行相关处理， 具体可以为：
步骤 S802, UE向媒体服务器发送 RTSP播放消息， 携带 UE要 切换的媒体内容标识。
步骤 S803, 媒体服务器向 UE发送响应消息例如： RTSP 200 OK 消息， 并利用切换前的媒体通道向 UE发送 RTSP播放消息中指示的 内容。
步骤 S804, 媒体服务器向业务控制功能实体发送切换信息。 可选地， 在收到切换信息之后， 媒体服务器向业务控制功能实体 发送响应消息。
步骤 S805 , 业务控制功能实体根据切换信息对用户内容访问进 行统计。
在本发明实施例七中，媒体服务器向业务控制功能实体发送切换 信息， 使得运营商可以进行内容访问统计处理，依据该切换信息交互 机制， 运营商还可以完成比如切换统计处理（统计切换发生的频度、 内容被访问的次数和时间）， 或对用户的切换到新内容进行计费的处 理等等。
如图 9 所示， 为本发明流媒体业务的切换方法实施例八的流程 图， 具体包括：
步骤 S901 , 建立会话， 接收切换前的媒体内容。 其中， 建立会 话的过程同本发明实施例六中的步骤 S701~步骤 S708。
然后， UE向业务控制功能实体发送切换请求， 要求变更访问的 内容， 业务控制功能实体进行相关处理， 具体为： 步骤 S902, UE向媒体服务器发送 RTSP播放消息， 携带 UE要 切换的媒体内容标识。 该媒体内容标识可以是整个内容的标识， 也可 以是媒体成分标识。 本实施例中， 传送 UE要切换的媒体内容比传送 切换前的媒体内容需要更大的带宽。
步骤 S903, 媒体服务器向 UE发送响应消息例如： RTSP 200 OK 消息， 并利用切换前的媒体通道向 UE发送 RTSP播放消息中指示的 内容。
步骤 S904, 媒体服务器向业务控制功能实体发送切换信息， 该 切换信息至少包括以下信息之一或组合： 切换目标内容标识、切换目 标成分标识信息、用户信息、被切换内容标识、被切换成分标识信息、 切换前后媒体间的替代关系信息、 切换前后成分间的对应关系信息、 媒体通道与切换前的媒体成分的对应关系信息、媒体通道与切换后的 媒体成分的对应关系信息， 以及内容或成分所需传送通道的参数信 息。
步骤 S905 , 业务控制功能实体生成新的媒体通道参数（这里是 带宽）， 向 UE方向发送 SIP Re-INVTIE消息携带这些参数， 也可通 过 SIP UPDATE消息携带这些参数。
步骤 S906, UE向业务控制功能实体回复 SIP 200OK消息。
经与 UE进行媒体协商以及对媒体前媒体流通道进行资源重新预 留， 业务控制功能实体可以控制修改切换前媒体流通道， 增加带宽， 从而更好的支持切换后的媒体流传送。
在本发明实施例八中，媒体服务器向业务控制功能实体发送切换 信息， 使得运营商可以进行媒体流通道的修改， 增加带宽以支持切换 到更高质量（画质、 音质） 的内容（通常需要更高的带宽）， 另外， 以同样的方式也能够支持用户切换到更普通质量的内容，降低媒体流 通道的带宽或其它指标（如时延）； 以及支持切换后， 因媒体内容的 媒体成分（指任意一条语音、 视频或数据）增加或减少， 而需要增加 或释放媒体流通道的处理。
本实施例八中，媒体服务器包括适配功能实体和 PSS服务器，这 时切换信息由适配功能实体发送给业务控制功能实体，具体可以通过
SIP INFO 消息携带该切换信息。 但是本发明实施例并不局限于此， 对于切换后需要修改媒体通道的情形，切换信息可以由媒体服务器或 适配功能实体发出的 SIP RelNVITE或 UPDATE消息携带， 利用 SIP 媒体重协商机制对媒体通道进行更改。
如图 10所示， 为本发明流媒体业务的切换方法实施例九的流程 图， 本发明实施例中， 媒体服务器具体可以在适配功能实体和 PSS 服务器上实现， 该适配功能实体分别与 PSS服务器和 UE相连， 则 UE与 PSS服务器交互的信息都经过该适配功能实体， PSS服务器与 业务控制功能实体交互的信息都经过该适配功能实体。
具体包括：
步骤 S1001 , UE通过 GPRS网络， 经 IMS核向业务控制功能实 体发送 SIP INVITE消息， 请求建立业务。
步骤 S1002,业务控制功能实体向适配功能实体发送 SIP INVITE 消息。
步骤 S1003 , 适配功能实体向 PSS服务器发送 RTSP建立消息， 请求建立会话。
步骤 S1004, PSS服务器向适配功能实体发送 RTSP响应消息。 步骤 S1005 , 适配功能实体向业务控制功能实体返回 SIP响应消 息。
步骤 S1006, 业务控制功能实体向 UE发送 SIP响应消息例如： SIP 200 OK消息。
步骤 S1007, UE向业务控制功能实体发送 SIPACK消息。
步骤 S1008, 适配功能实体向 PSS服务器发送 RTSP播放消息， 请求媒体播放。
步骤 S1009, PSS服务器向适配功能实体发送 RTSP响应消息。 至此， UE与网络侧建立业务， 媒体服务器开始向 UE发送媒体 内容， 可以通过 UDP ( User Datagram Protocol, 用户数据报协议 )或 TCP ( Transport Control Protocol, 传输控制协议）发送， 但并未建立 UE与适配器间的 RTSP通道。 上述业务建立过程仅是一种示例， 本 发明实施例并不局限于此。
然后， UE向业务控制功能实体发送切换请求， 要求变更访问的 内容， 业务控制功能实体进行相关处理， 具体为：
步骤 S1010, UE向业务控制功能实体发送 SIP Re-INVITE消息， 请求切换到 CoD业务内容。
步骤 S1011 , 业务控制功能实体向适配功能实体发送 SIP Re-INVITE消息。
步骤 S1012, 适配功能实体返回 SIP响应消息， 携带建立 UE与 适配器间的 RTSP通道建立信息， 例如： IP地址。
步骤 S1013 , 业务控制功能实体向 UE发送 SIP响应消息。
步骤 S1014, UE向业务控制功能实体发送 SIPACK消息。
步骤 S1015, 建立 UE与适配功能实体间的连接以传送 RTSP消 息。
步骤 S1016, UE经适配功能实体向 PSS服务器发送 RTSP播放 消息， 携带 UE要切换的业务内容标识。
步骤 S1017, PSS服务器经适配功能实体向 UE发送响应消息。 至此， UE开始接收切换后的内容。
在本发明实施例九中， 切换前 UE与网络侧未建立 RTSP通道， 通过在切换时利用 SIP建立 RTSP通道， UE可通过 RTSP进行内容切 换。
如图 11所示， 为本发明流媒体业务的切换方法实施例十的流程 图， 具体包括：
步骤 S1101~S1109, 同步骤 S1001到 S1009。
至此， UE与网络侧建立业务， 媒体服务器开始向 UE发送媒体 内容。上述业务建立过程仅是一种示例，本发明实施例并不局限于此。
然后， UE向业务控制功能实体发送切换请求， 要求变更访问的 内容， 业务控制功能实体进行相关处理， 具体为：
步骤 S1110, UE向业务控制功能实体发送 SIP Re-INVITE, SIP UPDATE或 SIP INFO消息， 请求切换内容， 上述消息至少包括以下 信息之一或组合： 切换目标内容标识、 切换目标成分标识信息、 用户 信息、被切换内容标识或成分标识信息、切换前后媒体间的替代关系 信息、切换前后成分间的对应关系信息、媒体通道与切换前的媒体成 分的对应关系信息、媒体通道与切换后的媒体成分的对应关系信息和 重用切换前媒体通道指示信息。
步骤 S1111 , 业务控制功能实体向适配功能实体发送 SIP Re-INVITE, SIP UPDATE或 SIP INFO消息， 上述消息中可携带以下 信息之一或组合： 切换目标内容标识、 切换目标成分标识信息、 用户 信息、被切换内容标识或成分标识信息、切换前后媒体间的替代关系 信息、切换前后成分间的对应关系信息、媒体通道与切换前的媒体成 分的对应关系信息、媒体通道与切换后的媒体成分的对应关系信息和 重用切换前媒体通道指示信息。
步骤 S1112, 适配功能实体向 PSS服务器发送 RTSP播放消息， 请求切换内容。
步骤 S1113 , PSS服务器向适配功能实体发送 RTSP响应消息。 PSS 服务器开始利用切换前的媒体传送通道向用户提供切换后的内 谷。
步骤 S1114, 适配功能实体返回 SIP响应消息。
步骤 S1115, 业务控制功能实体向 UE发送 SIP响应消息。
步骤 S1116, UE向业务控制功能实体发送 SIP ACK消息。
在本发明实施例十中， UE通过 SIP方式请求切换内容， 而适配 功能实体将 SIP方式的切换请求转换成 RTSP方式的切换请求， 使得 切换得以完成。 本实施例中， 若 PSS服务器生成了媒体描述信息、 同 步源信息和成功切换的媒体成分信息之一或组合，则上述信息可由适 配功能实体和 /或业务控制功能实体提供给用户设备。
如图 12所示，为本发明实施例流媒体业务的切换系统的结构图， 包括：
用户设备 121 , 用于通过 IMS建立业务， 接收媒体内容， 并发送 切换请求， 该切换请求携带请求的媒体标识；
媒体服务器 122, 用于向用户设备 121传送媒体内容， 接收用户 设备 121发送的切换请求， 或者，接收业务控制功能实体在接收到用 户设备 121发送的切换请求后， 发送的切换请求或指示， 并利用切换 前媒体内容的媒体通道向用户设备 121发送切换后的媒体内容。在本 发明实施例中，媒体服务器 122可以为 PSS服务器，也可以为一个媒 体资源功能实体， 还可以是 PSS服务器和适配功能实体的组合。
该流媒体业务的切换系统还包括： 业务控制功能实体 123 , 用于 对流媒体业务切换进行控制， 根据媒体服务器 122发送的切换信息， 进行控制 /参与媒体通道的增加、 修改或释放操作， 或进行统计或计 费处理。
该流媒体业务的切换系统还可以包括： 签约数据功能实体 124, 用于保存用户的媒体内容签约信息。签约数据功能实体 124可以为一 个单独的实体， 也可以集成在业务控制功能实体 123 和 /或媒体服务 器 122中。
该流媒体业务的切换系统还可以包括： 分组接入网 125 和 IMS 核 126,
其中， 分组接入网 125包括： GSM ( Global System For Mobile Communications,全球移动通信系统） PS ( Packet Switch,分组交换）、 UMTS ( Universal Mobile Telecommunications System, 通用移动通信 系统） PS、 WLAN、 LTE、 CDMAlx/DO或 WiMAX等。
其中， IMS核 126包括： P-CSCF、 I-CSCF( Interrogating Call Server Control Function, 查询呼叫服务器控制功能）、 S-CSCF ( Serving Call Server Control Function, 服务呼叫服务器控制功能）或 HSS ( Home Subscriber Server, 归属签约服务器）等。
其中， 该流媒体业务的切换系统还包括： 接口 A、 接口 A， 、 接 口 B、 接口 C、 接口 D和接口 E,
其中，接口 A是用户设备与 IMS中 P-CSCF之间的接口，接口 A， 是 CSCF ( Call Server Control Function, 呼叫服务器控制功能）与 AS 之间的接口， 都采用 SIP协议。
接口 B为业务控制功能实体 123与媒体服务器 122之间的接口， 可采用 RTSP/SIP协议。
接口 C为媒体服务器 122与用户设备 121之间的媒体内容传送以 及可选的流控制接口， 内容传送可采用 RTP ( Real-time Transport Protocol,实时传输协议）、 RTCP( Real-time Transport Control Protocol, 实时传送控制协议）等， 流控制可采用 RTSP协议。
接口 D为签约数据功能实体 124与业务控制功能实体 123之间 的接口， 可采用 DIAMETER (直径）等协议。
接口 E为签约数据功能实体 124与媒体服务器 122之间的接口， 可采用 DIAMETER等协议。
上述流媒体业务的切换系统， 媒体服务器 122接收用户设备 121 的切换请求或来自业务控制功能实体 123的切换请求或指示，通过切 换前的媒体通道向用户设备 121发送切换后的媒体内容，切换时业务 控制功能实体 123能够对切换进行业务处理。 从而实现了在 IMS架 构下利用切换前的媒体通道传送切换后的媒体内容， 同时在切换时能 够按切换后传送媒体的需要进行媒体通道的调整、对切换进行统计或 计费， 提高了切换速度、 用户的体验度以及网络对切换的控制能力。
如图 13所示， 为本发明实施例媒体服务器的结构图， 包括： 接收模块 131 , 用于接收用户设备 121发送的切换请求， 或者， 接收业务控制功能实体 123在接收到用户设备 121发送的切换请求 后， 发送的切换请求或指示；
发送模块 132, 用于利用切换前的媒体通道向用户设备 121发送 切换后的媒体内容。
该媒体服务器还可以包括：
授权检查模块 133, 用于对接收模块 131接收的切换请求进行授 权检查， 或代理进行授权检查。
其中， 授权检查模块 133 可以包括： 信息获取子模块 1331 , 用 于获取授权检查信息； 授权判断子模块 1332, 用于根据信息获取子模块 1331获取的授 权检查信息判断用户设备是否具有获取该切换请求中请求的媒体内 容的授权。
其中， 该媒体服务器还可以包括： 切换信息交互模块 134, 用于 向业务控制功能实体 123传送切换信息，该切换信息至少包括以下信 息之一或组合： 切换目标内容标识、 切换目标成分标识信息、 用户信 息、 被切换内容标识、 被切换成分标识信息、 切换前后媒体间的替代 关系信息、切换前后成分间的对应关系信息、媒体通道与切换前的媒 体成分的对应关系信息、媒体通道与切换后的媒体成分的对应关系信 息， 以及内容或成分所需传送通道的参数信息。
上述媒体服务器， 接收模块 131接收用户设备 121的切换请求， 发送模块 132 通过切换前的媒体通道向用户设备发送切换后的媒体 内容， 实现了在 IMS 架构下利用实时流的快速切换能力进行流媒体 业务的切换， 相对于通过完全重新建立业务的方式来实现切换， 提高 了切换的速度和用户的体验度。 同时， 通过切换信息交互模块 134, 向业务控制功能实体 123发送切换信息，使得业务控制功能实体可以 对切换进行通道调整、 统计或计费的处理， 提高了网络对切换的控制 能力。
如图 14所示， 为本发明实施例业务控制功能实体的结构图， 包 括：
接收模块 141 , 用于接收用户设备 121发送的切换请求； 发送模块 142, 用于向媒体服务器 122发送切换请求消息， 请求 或指示媒体服务器 122利用切换前的媒体通道向用户设备 121发送切 换后的媒体内容；
信息通知模块 143, 用于向用户设备 142发送媒体服务器 122生 成的媒体描述信息、同步源信息和成功切换的媒体成分信息之一或组 合。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解 到本发明可以通过硬件实现，也可以可借助软件加必要的通用硬件平 台的方式来实现基于这样的理解，本发明的技术方案可以以软件产品 的形式体现出来， 该软件产品可以存储在一个非易失性存储介质（可 以是 CD-ROM, U盘， 移动硬盘等） 中， 包括若干指令用以使得一 台计算机设备（可以是个人计算机， 服务器， 或者网络设备等）执行 本发明各个实施例所述的方法。
总之， 以上所述仅为本发明的较佳实施例而已， 并非用于限定本 发明的保护范围。 凡在本发明的精神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种流媒体业务的切换方法， 用于在 IP 多媒体子系统 IMS 架构下进行流媒体业务的切换， 其特征在于， 包括：
接收切换请求， 所述切换请求携带请求的媒体标识；
利用切换前的媒体通道向所述用户设备发送切换后的媒体内容。
2、 如权利要求 1所述流媒体业务的切换方法， 其特征在于， 所 述切换请求由所述用户设备发送到媒体服务器， 或者， 所述切换请求 由所述用户设备发送到业务控制功能实体，所述业务控制功能实体请 求或指示媒体服务器进行切换。
3、 如权利要求 1所述流媒体业务的切换方法， 其特征在于， 媒 体服务器在接收到切换请求后， 对所述切换请求进行授权检查。
4、 如权利要求 3所述流媒体业务的切换方法， 其特征在于， 所 述对切换请求进行授权检查包括：
获取授权检查信息；
根据所述授权检查信息判断来自所述用户设备的切换请求是否 能够被授权。
5、 如权利要求 4所述流媒体业务的切换方法， 其特征在于， 所 述获取授权检查信息包括：
从保存所述授权检查信息的功能实体处获取所述授权检查信息， 或者， 从媒体服务器处获取所述授权检查信息。
6、 如权利要求 3所述流媒体业务的切换方法， 其特征在于， 所 述对切换请求进行授权检查包括：
向业务控制功能实体发送授权检查请求，请求所述业务控制功能 实体对所述切换请求进行授权检查；
接收所述业务控制功能实体返回的授权检查结果。
7、 如权利要求 6所述流媒体业务的切换方法， 其特征在于， 所 述利用切换前的媒体通道向所述用户设备发送切换后的媒体内容包 括： 在所述授权检查通过之后，通过切换前的媒体通道向所述用户设 备发送切换后的媒体内容。
8、 如权利要求 1所述流媒体业务的切换方法， 其特征在于， 在 所述接收切换请求之前， 还包括：
用户设备获取媒体服务器的能力信息，所述能力信息为所述媒体 服务器是否具备利用切换前的实时流控制会话进行切换的能力信息； 当所述媒体服务器具备所述能力时，所述用户设备向所述媒体服 务器发送切换请求。
9、 如权利要求 8所述流媒体业务的切换方法， 其特征在于， 所 述用户设备获取媒体服务器的能力信息包括：
通过网络侧提供的内容菜单或内容列表，获取所述媒体服务器的 能力信息； 或者，
通过业务控制功能实体获取所述媒体服务器的能力信息； 或者， 建立所述用户设备与所述媒体服务器间的实时流控制会话，所述 用户设备从所述媒体服务器获取所述媒体服务器的能力信息。
10、 如权利要求 1所述流媒体业务的切换方法， 其特征在于， 所 述利用切换前的媒体通道向所述用户设备发送切换后的媒体内容包 括：
当向用户设备提供切换前的媒体内容的第一媒体服务器中没有 所述切换后的媒体内容时，所述第一媒体服务器从包含所述切换后的 媒体内容的第二媒体服务器处获取所述切换后的媒体内容；
所述第一媒体服务器通过切换前的媒体通道向所述用户设备发 送所述获取的切换后的媒体内容。
11、 如权利要求 10所述流媒体业务的切换方法， 其特征在于， 所述第一媒体服务器从包含所述切换后的媒体内容的第二媒体服务 器处获取所述切换后的媒体内容包括：
所述第一媒体服务器向所述第二媒体服务器发送实时流控制会 话建立请求， 建立实时流控制会话， 通过所述实时流控制会话获取所 述切换后的媒体内容； 或者， 所述第一媒体服务器通过文件传送协议从所述第二媒体服务器 处获取所述切换后的媒体内容。
12、 如权利要求 1所述流媒体业务的切换方法， 其特征在于， 媒 体服务器向业务控制功能实体发送切换信息，所述业务控制功能实体 根据所述切换信息进行业务处理。
13、 如权利要求 12所述流媒体业务的切换方法， 其特征在于， 所述切换信息至少包括以下信息之一或组合：
切换目标内容标识、 切换目标成分标识信息、 用户信息、 被切换 内容标识、 被切换成分标识信息、 切换前后媒体间的替代关系信息、 切换前后成分间的对应关系信息、媒体通道与切换前的媒体成分的对 应关系信息、媒体通道与切换后的媒体成分的对应关系信息， 以及内 容或成分所需传送通道的参数信息。
14、 如权利要求 12所述流媒体业务的切换方法， 其特征在于， 所述业务控制功能实体根据所述切换信息进行业务处理具体包括： 所述业务控制功能实体根据所述切换信息进行业务统计； 或者， 所述业务控制功能实体根据所述切换信息进行计费； 或者， 所述业务控制功能实体根据所述切换信息参与修改、增加或释放 媒体通道， 满足切换后的媒体内容的传送需要。
15、 如权利要求 12所述流媒体业务的切换方法， 其特征在于， 所述媒体服务器包括适配功能实体和包交换流业务 PSS服务器， 所述媒体服务器向业务控制功能实体发送切换信息具体包括： 所述适配功能实体向所述业务控制功能实体发送切换信息。
16、如权利要求 15所述的流媒体业务的切换方法， 其特征在于， 在所述接收切换请求之后， 还包括：
所述适配功能实体向所述 PSS服务器发送切换请求，利用切换前 媒体通道发送切换后的媒体内容。
17、 如权利要求 2所述流媒体业务的切换方法， 其特征在于， 当 所述切换请求由所述用户设备发送到业务控制功能实体，所述业务控 制功能实体请求或指示媒体服务器进行切换，则所述切换请求至少包 含以下信息之一或组合：
切换目标内容标识、 切换目标成分标识信息、 用户信息、 被切换 内容标识或成分标识信息、切换前后媒体间的替代关系信息、切换前 后成分间的对应关系信息、媒体通道与切换前的媒体成分的对应关系 信息、媒体通道与切换后的媒体成分的对应关系信息和重用切换前媒 体通道指示信息。
18、 如权利要求 2所述流媒体业务的切换方法， 其特征在于， 所 述媒体服务器包括适配功能实体和 PSS服务器，
所述业务控制功能实体请求或指示媒体服务器进行切换，利用切 换前的媒体通道发送切换后的媒体内容具体包括：
所述业务控制功能实体请求或指示适配功能实体，由所述适配功 能实体向所述 PSS服务器发送内容切换请求，利用切换前的媒体通道 发送切换后的媒体内容。
19、 如权利要求 18所述流媒体业务的切换方法， 其特征在于， 所述 PSS服务器接收到所述切换请求后， 生成以下信息之一或组合： 媒体描述信息、 同步源信息和成功切换的媒体成分信息， 则所述媒体 描述信息、同步源信息和成功切换的媒体成分信息经由业务控制功能 实体和 /或适配功能实体传送给所述用户设备。
20、 如权利要求 1所述流媒体业务的切换方法， 其特征在于， 所 述媒体服务器包括适配功能实体和 PSS服务器，
所述接收切换请求具体包括：
所述适配功能实体接收来自用户设备的切换请求，向业务控制功 能实体发起修改媒体传送通道请求，并向所述 PSS服务器发送内容切 换请求， 利用切换前的媒体通道发送切换后的媒体内容。
21、 如权利要求 20所述流媒体业务的切换方法， 其特征在于， 所述向业务控制功能实体发起修改媒体传送通道请求具体包括：
所述适配功能实体获取切换后媒体传送通道的服务质量 QoS参 数信息， 依据所述 QoS参数信息发起修改媒体传送通道请求。
22、 一种流媒体业务的切换系统， 其特征在于， 包括： 用户设备， 用于发送切换请求；
媒体服务器，用于接收所述用户设备直接发送的切换请求，或者， 接收业务控制功能实体在接收到用户设备发送的切换请求后，发送的 切换请求或指示，并利用切换前的媒体通道向所述用户设备发送切换 后的媒体内容。
23、 如权利要求 22所述流媒体业务的切换系统， 其特征在于， 还包括：
业务控制功能实体， 用于对流媒体业务切换进行控制，根据所述 媒体服务器发送的切换信息，进行媒体通道的增加、修改或释放操作， 或进行统计或计费处理； 或者，
所述业务控制功能实体用于接收用户的切换请求，请求或指示所 述媒体服务器利用切换前的媒体通道向所述用户设备发送切换后的 媒体内容， 向所述用户设备传送所述媒体服务器生成的媒体描述信 息、 同步源信息和成功切换的媒体成分信息之一或组合。
24、 一种媒体服务器， 其特征在于， 包括：
接收模块， 用于接收用户设备直接发送的切换请求， 或者， 接收 业务控制功能实体在接收到用户设备发送的切换请求；
发送模块，用于利用切换前的媒体通道向所述用户设备发送切换 后的媒体内容。
25、 如权利要求 24所述媒体服务器， 其特征在于， 还包括： 切换信息交互模块， 用于向业务控制功能实体传送切换信息， 所 述切换信息至少包括以下信息之一或组合： 切换目标内容标识、切换 目标成分标识信息、 用户信息、 被切换内容标识、 被切换成分标识信 息、切换前后媒体间的替代关系信息、 切换前后成分间的对应关系信 息、媒体通道与切换前的媒体成分的对应关系信息、媒体通道与切换 后的媒体成分的对应关系信息，以及内容或成分所需传送通道的参数 信息。
26、 如权利要求 25所述媒体服务器， 其特征在于， 所述媒体服 务器包括适配功能实体和 PSS服务器， 所述适配功能实体分别与所 述 PSS服务器、用户设备和所述业务控制功能实体相连，所述切换信 息由适配功能实体向业务控制功能进行传递。
27、 一种业务控制功能实体， 其特征在于， 包括：
接收模块， 用于接收用户设备发送的切换请求；
发送模块， 用于向媒体服务器发送切换请求消息， 请求或指示所 述媒体服务器利用切换前的媒体通道向所述用户设备发送切换后的 媒体内容。
信息通知模块，用于向所述用户设备发送所述媒体服务器生成的 媒体描述信息、 同步源信息和成功切换的媒体成分信息之一或组合。
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