WO2012113240A1 - Procédé de négociation de session multimédia, et dispositif et système associés - Google Patents

Procédé de négociation de session multimédia, et dispositif et système associés Download PDF

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Publication number
WO2012113240A1
WO2012113240A1 PCT/CN2011/081401 CN2011081401W WO2012113240A1 WO 2012113240 A1 WO2012113240 A1 WO 2012113240A1 CN 2011081401 W CN2011081401 W CN 2011081401W WO 2012113240 A1 WO2012113240 A1 WO 2012113240A1
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WIPO (PCT)
Prior art keywords
media
session
message
terminal
sdp
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PCT/CN2011/081401
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English (en)
Chinese (zh)
Inventor
唐春平
刘鹤贤
马尔利
董翔宇
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华为技术有限公司
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Publication of WO2012113240A1 publication Critical patent/WO2012113240A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities
    • 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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • 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
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1094—Inter-user-equipment sessions transfer or sharing

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, a related device, and a system for negotiating a multimedia session.
  • Data redundancy refers to the technology of storing the same data in different data packets. If the average continuous packet loss rate is low, if a data packet is lost during transmission, the receiver can still pass the subsequent data packet. The redundant data in the data reorganizes and recovers the lost data information to avoid the problem of poor voice quality caused by packet loss. At present, data redundancy has been widely applied and formed a request for comment (RFC, Request). For Comments) 2198 standard.
  • Session Description Protocol SDP
  • SIP Session Initiation Protocol
  • the SDP data carried in the SIP message is used for session negotiation (such as negotiation of media redundancy, media format, media codec, media receiving address, port, etc.).
  • the RFC 2198 standard described above only describes SDP for a single type of data redundancy capability. That is, based on the existing RFC 2198 standard, the calling party and the called party can only negotiate the redundancy capability of a single type of media. However, There are often multiple media types (such as voice, video, etc.) in a session. Therefore, existing methods that can only negotiate the redundancy capabilities of a single type of media have obvious limitations. Summary of the invention
  • Embodiments of the present invention provide a method, a related device, and a system for negotiating a multimedia session, which are used for Solve the problem of existing redundancy that can only be used for single-class media in a session.
  • the embodiment of the present invention provides the following technical solutions:
  • a method for negotiating a multimedia session including:
  • the called terminal receives the first session negotiation message from the calling terminal, and the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media; the called terminal according to the local session The capability selects an attribute parameter carried in the received SDP packet.
  • the called terminal generates a new SDP packet according to the selected attribute parameter.
  • the called terminal sends the generated SDP packet to the calling terminal through the second session negotiation message.
  • a terminal comprising:
  • a receiving unit configured to receive a first session negotiation message from the calling terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media;
  • a selecting unit configured to select, according to a local session capability, an attribute parameter carried in the received SDP packet
  • a generating unit configured to generate a new SDP packet according to the attribute parameter selected by the selecting unit, and send, by the sending unit, the SDP packet generated by the generating unit to the calling terminal by using a second session negotiation message.
  • a terminal comprising:
  • a sending unit configured to send a first session negotiation message to the called terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media;
  • a receiving unit configured to receive a second session negotiation message returned by the called terminal
  • the session processing unit is configured to establish or refresh a session with the called terminal according to the SDP message in the second session negotiation message received by the receiving unit.
  • a multimedia session system including:
  • the first terminal is configured to send a first session negotiation message to the second terminal, where the attribute parameter carried in the session description protocol SDP packet in the first session negotiation message includes media of at least two media.
  • the parameter and the media redundancy parameter ; receiving the second session negotiation message returned by the second terminal, and establishing or refreshing the session with the second terminal according to the SDP message in the second session negotiation message.
  • the second terminal is configured to receive the first session negotiation message from the first terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media redundancy parameters of at least two media; The attribute parameters included in the received SDP message are selected; the new SDP message is generated according to the selected attribute parameter; and the generated SDP message is sent to the first terminal by using the second session negotiation message.
  • the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session.
  • FIG. 1 is a schematic flowchart of another embodiment of a method for negotiating a multimedia session according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another embodiment of a method for negotiating a multimedia session according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a multimedia session system according to an embodiment of the present invention.
  • Embodiments of the present invention provide a method, a related device, and a system for negotiating a multimedia session.
  • an embodiment of a method for negotiating a multimedia session in the embodiment of the present invention includes:
  • the called terminal receives a first session negotiation message from the calling terminal.
  • the calling terminal When a terminal (ie, the calling terminal) pre-initiates a session with the opposite end (ie, the called terminal) to establish or update a session with the called terminal, the calling terminal sends a first session negotiation message to the called terminal, to The session initialization is triggered, where the first session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • the calling and receiving terminals may negotiate the new session by carrying an SDP message including a new session parameter (such as a session identifier, a session duration, and an attribute parameter such as a media parameter, a media redundancy parameter, etc.) in the interactive session negotiation message. So that the calling terminal can establish or update the session according to the negotiated session parameters.
  • a new session parameter such as a session identifier, a session duration, and an attribute parameter such as a media parameter, a media redundancy parameter, etc.
  • the calling terminal when it initiates a session to the called terminal, it may encapsulate the media parameter of the media type corresponding to the pre-transmitted media data (which may include one or more media) in the SDP message.
  • the media parameters include, but are not limited to, a media type indication parameter and a media codec indication parameter.
  • the media codec indication parameter may indicate a media codec supported by the calling terminal, and the calling terminal may carry multiple media codec indications.
  • the parameter is configured to enable the called terminal to learn the media codec supported by the calling terminal when receiving the SDP message sent by the calling terminal. Further, if the calling terminal supports the redundancy capability of the media type, the corresponding media redundancy parameter may also be encapsulated in the SDP packet, and the SDP packet is sent to the called terminal by using the first session negotiation message. .
  • the attribute parameter carried in the SDP packet sent by the calling terminal includes the media parameter and the media redundancy parameter of the at least two media, where the media redundancy parameter includes but is not limited to the redundancy type indication parameter,
  • the media codec indication parameter corresponding to the redundant codec.
  • the value of the redundancy type indication parameter and the media codec indication parameter may be a load type (PT, Payload Type) value mapped to various media codecs and redundant codecs.
  • the called terminal selects an attribute parameter carried in the received SDP packet according to the local session capability.
  • the called terminal When the called terminal receives the SDP message from the calling terminal, it can be based on the local session capability (such as supported media type, supported media codec, supported media type redundancy capability, redundant codec, etc.)
  • the attribute parameters (such as media parameters, media redundancy parameters, etc.) carried in the received SDP packets are selected.
  • the called party The terminal may select a corresponding media parameter from the received SDP packet according to the locally supported media type and the media codec capability, such as a media type indication parameter corresponding to the locally supported media type, and corresponding to the locally supported media codec.
  • Media codec indication parameter a media type indication parameter corresponding to the locally supported media type, and corresponding to the locally supported media codec.
  • Media codec indication parameter a media redundancy parameter from the received SDP message, such as redundancy type indication parameter and redundancy
  • the codec corresponding to the codec indicates parameters and the like.
  • the called terminal generates a new SDP packet according to the selected attribute parameter.
  • a new SDP packet may be generated according to the selected attribute parameter.
  • the generated SDP message can be identical to the received SDP message.
  • the called terminal sends the generated SDP packet to the calling terminal by using a second session negotiation message.
  • the called terminal sends the generated SDP message to the calling terminal through the second session negotiation message, so that the calling terminal establishes or refreshes the session with the called terminal according to the SDP message returned by the called terminal.
  • the foregoing second session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • the called terminal may also modify or delete other session parameters except the above attribute parameters in the received SDP message, but the processing is performed.
  • the prior art does not involve the technical solution to be described in the present invention. Therefore, in the embodiment of the present invention, the default called terminal does not need to modify other session parameters in the received SDP message (for example, Description of the technical solution of the present invention by modifying the parameters such as session duration and redundancy levels.
  • the technical solution provided by the embodiment of the present invention can be applied to a single-mode session scenario, and can also be applied to a multi-mode session scenario.
  • the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session.
  • a method for negotiating a multimedia session in the embodiment of the present invention is described below. Referring to FIG. 2, another embodiment of a method for negotiating a multimedia session in the embodiment of the present invention includes:
  • the calling terminal sends a first session negotiation message to the called terminal.
  • the calling terminal when it initiates a session to the called terminal, it may encapsulate the media parameter of the media type corresponding to the pre-transmitted media data (which may include one or more media) in the SDP message.
  • the media parameters include, but are not limited to, a media type indication parameter and a media codec indication parameter.
  • the media codec indication parameter may indicate a media codec supported by the calling terminal, and the calling terminal may carry multiple media codec indications.
  • the parameter is configured to enable the called terminal to learn the media codec supported by the calling terminal when receiving the SDP message sent by the calling terminal. Further, if the calling terminal supports the redundancy capability of the media type, the corresponding media redundancy parameter may also be encapsulated in the SDP packet, and the SDP packet is sent to the called terminal by using the first session negotiation message. .
  • the attribute parameter carried in the SDP packet sent by the calling terminal includes the media parameter and the media redundancy parameter of the at least two media, where the media redundancy parameter includes but is not limited to the redundancy type indication parameter, The media codec indication parameter corresponding to the redundant codec.
  • the value of the redundancy type indication parameter and the media codec indication parameter may be a PT value mapped to various media codecs and redundant codecs.
  • the foregoing first session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • the calling terminal receives the second session negotiation message returned by the called terminal, and establishes or refreshes a session with the called terminal according to the SDP message in the second session negotiation message.
  • the calling terminal can establish or refresh the SDP message returned by the called terminal, and the calling terminal can simultaneously perform redundancy on the plurality of media transmitted in the established or updated session.
  • the foregoing second session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session.
  • a method for negotiating a multimedia session in the embodiment of the present invention is described below with reference to a specific application example.
  • the user equipment (UE, User Equipment) 1 is the session originating end, that is, the calling terminal, and UE2 is the called terminal.
  • UE1 supports RFC2833 encoded data and voice data, and supports G.711A, G.729 encoded voice data, with redundancy capability of RFC2833 encoded data and redundancy of voice data;
  • UE2 supports voice data, does not support RFC2833 encoding. It only supports G.729 encoded voice data and has the redundancy capability of voice data.
  • UE1 sends a first session negotiation message to UE2.
  • the UE1 encapsulates the pre-negotiated session parameters (including the attribute parameters) in the SDP packet, and sends the message to the UE2 through the first session negotiation message.
  • the SDP packet sent by the UE1 includes the media parameters and media redundancy parameters of the two media of the RFC2833 encoded data and the voice data, and specifically includes the voice type indication parameter; the media codec corresponding to the G.711A Indication parameter (such as PT value 8); media codec indication parameter corresponding to G.729 (such as PT value 18); redundant type indication parameter corresponding to voice data (such as PT value of 96), redundant codec G.711A Corresponding media codec indication parameter (such as PT value 8), media codec indication parameter corresponding to the redundancy codec G.729 (such as PT value 18), and media codec indication parameter corresponding to RFC2833 (such as PT value 97); The redundancy type indication parameter (such as PT value 98) corresponding to the RFC2833 encoded data, and the media codec indication parameter (such as the PT value 97) corresponding to the redundant codec RFC2833.
  • the redundancy type indication parameter such as PT value
  • the UE2 selects an attribute parameter carried in the received SDP packet according to the local session capability.
  • the attribute parameter carried in the received SDP message in the first session negotiation message may be selected according to the local session capability.
  • UE2 since UE2 only supports G.729 encoded voice data, it does not support RFC2833 encoding, and has the redundancy capability of voice data. Therefore, UE2 selects a voice type indication parameter and a media codec indication parameter corresponding to G.729 (such as PT value 18) from the received SDP message, and then selects a redundancy type indication parameter corresponding to the voice data from the SDP message. (eg PT value is 96), media codec indication parameter of redundant codec G.729 (eg PT value 18).
  • UE2 does not support RFC2833 encoding, so media parameters related to RFC2833 (media codec indication parameters corresponding to RFC2833) and media redundancy parameters (redundant type indication parameters and redundancy scheme corresponding to RFC2833 encoded data are not selected). Decoding the media codec indication corresponding to RFC2833.
  • media codec indication parameters corresponding to RFC2833 media codec indication parameters corresponding to RFC2833
  • media redundancy parameters redundant type indication parameters and redundancy scheme corresponding to RFC2833 encoded data are not selected.
  • Decoding the media codec indication corresponding to RFC2833 Although UE2 supports the redundancy capability of voice data, since it does not support G.711A codec, it does not use G.711 to redundantly encode voice data, so no redundancy is selected. Decoding the media codec indication parameter corresponding to G.711A.
  • the UE2 if the UE2 supports the RFC2833 codec data, but does not support the redundancy capability of the RFC2833 data, the UE2 will select the media parameter corresponding to the RFC2833 encoded data, but does not select the media corresponding to the RFC2833 encoded data. Redundant parameters.
  • the UE2 generates a new SDP message according to the selected attribute parameter.
  • a new SDP packet may be generated according to the selected attribute parameter.
  • the UE2 sends the generated SDP packet to the UE1 through the second session negotiation message, and the UE1 sends the generated SDP packet to the UE2 through the second session negotiation message, so that the UE1
  • the UE2 establishes or refreshes a session with the called terminal according to the SDP message returned by the UE1.
  • the UE1 establishes or refreshes a session with the UE2 according to the SDP packet in the second session negotiation message returned by the UE2.
  • the UE2 may establish or refresh a session with the called terminal according to the SDP message returned by UE1.
  • the UE1 receives the SDP packet returned by the UE2, it can be learned that the UE2 supports the G.729-encoded voice data and the G.729-encoded voice data redundancy, and the UE2 can transmit in the session to be established.
  • G.729 encoded speech data and the speech data is redundant using G.729 encoding.
  • the UE1 can transmit the G.729 encoded voice data and the RFC2833 encoded data in the session to be established, and simultaneously perform redundancy on the two data. .
  • the foregoing first session negotiation message and the second conference negotiation message may be SIP protocol messages, or may be other end-to-end peer-to-peer protocol messages based on the SDP protocol, which is not limited herein.
  • the foregoing UE1 may also modify or delete other session parameters except the above attribute parameters in the received SDP message, but the processing belongs to The prior art does not involve the technical solution to be clarified by the present invention. Therefore, in the embodiment of the present invention, in the case that the default UE1 does not need to modify other session parameters in the received SDP packet (such as session duration, Description of the technical solution of the present invention by modifying the parameters such as redundant series.
  • a terminal provided by the embodiment of the present invention includes:
  • the receiving unit 401 is configured to receive a first session negotiation message from the calling terminal.
  • the attribute parameter carried in the SDP packet in the first session negotiation message includes media parameters and media redundancy parameters of at least two media.
  • the selecting unit 402 is configured to select, according to the local session capability, the attribute parameter carried in the received SDP packet;
  • the selecting unit 402 can be triggered according to the local session capability (such as supported media type, supported media codec, supported media type redundancy capability and redundancy). Codec, etc.) selects attribute parameters (such as media parameters, media redundancy parameters, etc.) carried in the received SDP packets.
  • the local session capability such as supported media type, supported media codec, supported media type redundancy capability and redundancy.
  • Codec, etc. selects attribute parameters (such as media parameters, media redundancy parameters, etc.) carried in the received SDP packets.
  • the selecting unit 402 may select a corresponding SDP packet from the received SDP packet according to the locally supported media type and the media encoding and decoding capability.
  • Media parameters such as media type indication parameters corresponding to locally supported media types, media codec indication parameters corresponding to local media codec capabilities); according to local media codec capabilities and redundant capabilities of supported media types,
  • Corresponding media redundancy parameters such as a redundancy type indication parameter and a media codec indication parameter corresponding to the redundancy codec, are selected in the received SDP message.
  • the foregoing first session negotiation may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • the generating unit 403 is configured to generate a new SDP message according to the attribute parameter selected by the selecting unit 402.
  • the sending unit 404 is configured to send, by using the second session negotiation message, the SDP ⁇ message generated by the generating unit 403 to the calling terminal.
  • the foregoing second conference negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • the terminal in this embodiment may be used as the called terminal in the foregoing method embodiment, and may be used to implement all the technical solutions in the foregoing method embodiments, and the functions of the respective functional modules may be in accordance with the foregoing method embodiments.
  • the specific implementation of the method may be referred to the related description in the foregoing embodiments, and details are not described herein again.
  • the following is a description of another terminal in the embodiment of the present invention for implementing the foregoing method for negotiating a multimedia session. Referring to FIG. 5, a terminal provided by the embodiment of the present invention includes:
  • the sending unit 501 is configured to send a session initiation protocol first session negotiation message to the called terminal, where the attribute parameter carried in the session description protocol SDP message in the first session negotiation message includes media parameters and media of at least two media.
  • the media parameter includes, but is not limited to, a media type indication parameter and a media codec indication parameter.
  • the media redundancy parameter includes, but is not limited to, a redundancy type indication parameter, and a media codec indication parameter corresponding to the redundancy codec.
  • the value of the redundancy type indication parameter and the media codec indication parameter may be a PT value mapped to various media codecs and redundant codecs.
  • the receiving unit 502 is configured to receive the second session negotiation message returned by the called terminal, and the session processing unit 503 is configured to establish or refresh the SDP message according to the second session negotiation message received by the receiving unit 502. a session called a terminal;
  • the foregoing first session negotiation message and the second conference negotiation message may be SIP protocol messages, or may be other end-to-end peer-to-peer protocol messages based on the SDP protocol, which is not limited herein.
  • the session processing unit 503 can establish or refresh a session with the called terminal according to the SDP message returned by the called terminal. If the SDP message returned by the called terminal still includes media redundancy parameters of two or more media, the foregoing The terminal can simultaneously perform redundancy on the plurality of media transmitted in the session established or updated by the session processing unit 503.
  • the terminal in this embodiment may be used as the calling terminal in the foregoing method embodiment, and may be used to implement all the technical solutions in the foregoing method embodiments, and the functions of the various functional modules may be in accordance with the foregoing method embodiments.
  • the specific implementation of the method may be referred to the related description in the foregoing embodiments, and details are not described herein again.
  • the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal Calling a terminal to simultaneously perform redundancy on multiple media before establishing or updating a session Negotiation, which in turn solves the problem of existing redundancy in a single type of media that can only be used in a session.
  • the multimedia session system in the embodiment of the present invention is described below. Referring to FIG. 6, the multimedia session system in the embodiment of the present invention includes:
  • the first terminal 601 is configured to send a first session negotiation message to the second terminal 602, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media.
  • the second session negotiation message returned by the second terminal 602 is received, and the session with the second terminal 602 is established or refreshed according to the received SDP message in the second session negotiation message.
  • the first terminal 601 when the first terminal 601 initiates a session to the second terminal 602, it may encapsulate the media parameter of the media type corresponding to the pre-transmitted media data (which may include one or more media) in the SDP message.
  • the media parameters include, but are not limited to, a media type indication parameter and a media codec indication parameter.
  • the media codec indication parameter may indicate a media codec supported by the first terminal 601, and the first terminal 601 may carry multiple media. Decoding the indication parameter, so that the second terminal 602 learns the media codec supported by the first terminal 601 when receiving the SDP message sent by the first terminal 601. Further, if the first terminal 601 supports the media type The SDP packet is also encapsulated in the SDP packet, and the SDP packet is sent to the second terminal 602 by using the first session negotiation message.
  • the second terminal 602 is configured to receive the first session negotiation message from the first terminal 601, where the attribute parameter carried in the SDP message in the first session negotiation message includes media redundancy parameters of at least two media;
  • the session capability selects the attribute parameter carried in the received SDP message; generates a new SDP message according to the selected attribute parameter; and sends the generated SDP message to the first terminal 601 by using the second session negotiation message.
  • the second terminal 602 may select a corresponding SDP packet from the received SDP packet according to the locally supported media type and the media encoding and decoding capability.
  • Media parameters (such as media type indication parameters corresponding to locally supported media types, media codec indication parameters corresponding to local media codec capabilities); according to local media codec capabilities and redundant capabilities of supported media types, Corresponding media redundancy parameters, such as a redundancy type indication parameter and a media codec indication parameter corresponding to the redundancy codec, are selected in the received SDP message.
  • the foregoing first session negotiation message and the second conference negotiation message may be SIP protocol messages, or It may be an end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.
  • first terminal 601 in this embodiment may be the calling terminal in the foregoing method embodiment
  • second terminal 602 in this embodiment may be the called terminal in the foregoing method embodiment, which may be used for All the technical solutions in the foregoing method embodiments are implemented, and the functions of the respective functional modules may be implemented according to the method in the foregoing method embodiments.
  • specific implementation process refer to the related description in the foregoing embodiments, and details are not described herein again.
  • the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session.
  • the medium can be a read only memory, a random access memory, a magnetic or optical disk, and the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
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  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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Abstract

La présente invention se rapporte à un procédé de négociation de session multimédia. L'invention se rapporte d'autre part à un dispositif et à un système associés. Le procédé de négociation de session multimédia comprend les étapes suivantes : un terminal appelé reçoit un premier message de négociation de session en provenance d'un terminal appelant, des paramètres d'attribut véhiculés dans un paquet de protocole de description de session (SDP, Session Description Protocol) du premier message de négociation de session contenant un paramètre de média et un paramètre de redondance de média d'au moins deux médias; le terminal appelé sélectionne, sur la base de la capacité d'une session locale, un paramètre d'attribut véhiculé dans le paquet SDP reçu; le terminal appelé génère un nouveau paquet SDP sur la base du paramètre d'attribut sélectionné; et le terminal appelé envoie le paquet SDP généré au terminal appelant via un second message de négociation de session. La solution technique décrite dans la présente invention permet de résoudre efficacement le problème lié, dans l'état de la technique, au fait qu'il n'est possible d'exécuter une redondance que sur un seul type de médias au cours d'une session.
PCT/CN2011/081401 2011-02-22 2011-10-27 Procédé de négociation de session multimédia, et dispositif et système associés WO2012113240A1 (fr)

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