JP2006518948A - マルチメディア・ストリーミングにおけるストリーミング品質適合と制御機構のシグナリング方法 - Google Patents
マルチメディア・ストリーミングにおけるストリーミング品質適合と制御機構のシグナリング方法 Download PDFInfo
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- H—ELECTRICITY
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- G—PHYSICS
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- G—PHYSICS
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Abstract
Description
クライアントは、適合機能または機能の制御を有し、適合に必要な決定を行う。その決定は、ネットワーク、サーバ、または、サービス規定内の他の情報資源から集められた情報に基づいている。
サーバは、適合機能または機能の制御を有し、適合に必要な決定を行う。その決定は、ネットワーク、クライアント、または、サービス規定内の他の情報資源から集められた情報に基づいている。
適合機能または機能の制御は、サーバとクライアント間に分配される。サーバとクライアントの両方は、ネットワーク、サーバ、クライアント、または、サービス規定内の他の情報資源から集められた情報に基づいて、適合に必要な行動をとる。
クライアントによってサポートされる適合機構または機能を規定する属性を示す情報を出力するクライアントと、
出力情報に基づいて1つ以上の属性を選択するサーバと、
そのサーバによって選択される1以上の属性によって規定される1以上の適合機構または機能を知ることを、クライアントに許すために、選択属性を示す情報をさらに出力するサーバとを備える。
2つのパーティの1つによって、2つのパーティの他の1つへ1以上の適合機構または機能を情報を出力し、
その情報に応答して、他のパーティから、そのパーティへメッセージを搬送し、1以上の適合機構または機能のサポートを認識する。
draft-avpf-04で定義されるAVPFがクライアントによってサポートされ、かつ、クライアントはAVPFサポートを信号伝達する場合、そのとき、サーバは、適合処理の中で、draft-avpf-04で定義されるAVPF特性のいかなる組合せを使用しても良い。AVPFのサポート可能な特性(例えば、即時のフィードバックモード、早期のRTCPパケットサポート等)のための明確な機構識別子がある場合、クライアントは、その特性の各々を分割して信号伝達する。
− クライアントは、RTSP DESCRIBE要求を、機能交換サーバに存在するクライアント機能情報を指すURIと共にサーバに送る。
3G PSSにおいて、RTSPプロトコールは、マルチメディアセッションを制御するために使用される。
DESCRIBE rtsp://foo/twister RTSP/1.0
CSeq:1
Require: x-avpfsupport, x-unsupportedadaptationsupport,x-supporteddataadaptationsupport
− サーバは、メッセージ本体にサポートされない機構および機能を含んで、RTSP551“オプションはサポートされません(Option Not Supported)”応答を送る:
RTSP/1.0 551 Option Not Supported
CSeq:1
Unsupported: x-unsupportedadaptationsupport
DESCRIBE rtsp://foo/twister RTSP/1.0
CSeq:2
Require: x-avpfsupport,x-supportedadaptationsupport
− サーバは、図3に示すSDP記述をも含む、RTSP 200 OKメッセージと共に応答する。
− サーバは、RTSP551ステータス応答無しで未サポート機構/機能情報を含む、RTSP DESCRIBE応答を送る。RTSP DESCRIBE応答を、図4に示す。
属性“RtxSupport”を、RDFスキーマボキャブラリにおいて規定して、映像および音声メディアのためのドラフト再伝送で規定されるRTP再伝送機構の使用を信号伝達する。RTXサポートは、自動的にクライアント側でABVFサポートに規定される。
− クライアントは、RTSP DESCRIBE要求をサーバに、機能交換サーバに存在するクライアント機能情報を指すURIと共に送る。
3GPSS、RTSPプロトコールは、マルチメディアセッションを制御するために使用される。
DESCRIBE rtsp://foo/twister RTSP/1.0
CSeq: 1
Require: x-rtxsupport, x-unsupportedadaptationsupport, x-supportedadaptationsupport
− サーバは、メッセージ本体に未サポート機構または機能が含まれる、RTSP551“オプションはサポートされない(Option Not Supported)”を送る。
サーバ->クライアント
RTSP/1.0 551 Option not supported
Cseq: 1
Unsuported: x-unsupportedadaptationsupport
DESCRIBE rtsp://foo/twister RTSP/1.0
CSeq: 2
Require: x-rtxsupport, x-supportedadaptationsupport
− サーバは、RTSP551状態応答無しで、未サポート機構/機能情報を含む、RTSP DESCRIBE応答を送る。そのRTSP DESCRIBE応答は、図8に示される。
属性“SRTPSupport”は、RDFスキーマボキャブラリで規定され、映像および音声メディアのためのdraft-srtp-05で規定されたSRTPのサポートをシグナリングする。
− クライアントは、機能交換サーバに存在するクライアント機能情報を指すURIと共にサーバに、RTSP DESCRIBE要求を送る。
3GPSS、RTSPプロトコールは、マルチメディアセッションを制御するために使用される。
DESCRIBE rtsp://foo/twister RTSP/1.0
CSeq: 1
Require: x-srtpsupport, x-unsupportedadaptationsupport, x-supportedadaptationsupport
代替1:
− サーバは、メッセージ本体に未サポート機構または機能を含む、RTSP551“オプションはサポートされない(Option Not Supported)”を送る。
RTSP/1.0 551 Option not supported
Cseq: 1
Unsuported: x-unsupportedadaptationsupport
DESCRIBE rtsp://foo/twister RTSP/1.0
CSeq: 2
Require: x-srtpsupport, x-supportedadaptationsupport
− サーバは、RTSP 551 ステータス応答無しで、未サポート機構/機能情報を含む、RTSP DESCRIBE応答を送る。RTSP DESCRIBE応答を、図12に示す。
Claims (7)
- マルチメディア・ストリーミング・サービスにおけるクライアントとサーバ間のシグナリングおよびネゴシエーションの方法において、データ配信のための前記サービスにおける複数の適合機構または機能は、前記クライアントによってサポートされ、各適合機構または機能は、属性を有し、
前記クライアントは、該クライアントによってサポートされる前記適合機構または機能を規定する前記属性を示す情報を出力し、
前記サーバは、前記出力情報に基づいて1つ以上の前記属性を選択し、
前記サーバは、さらに、該サーバによって選択される前記1以上の属性によって規定される前記1以上の適合機構または機能を知ることを、前記クライアントに許すために、該選択属性を示す情報を出力することによって特徴付けられる方法。 - 前記クライアントは、機能交換機構を介して前記情報を出力することを特徴とする請求項1に記載の方法。
- 前記クライアントは、マルチメディアストリーミング制御プロトコールを介して前記情報を出力することを特徴とする請求項1に記載の方法。
- 前記サーバは、さらに、前記クライアントが情報を出力する前に、該クライアントへ機能の指示を出力することによって特徴付けられる請求項1に記載の方法。
- マルチメディア・ストリーミング・サービスにおけるクライアントとサーバを含む2つのパーティ間のシグナリングおよびネゴシエーションのための方法において、データ配信のための前記サーバにおける使用のための複数の適合機構または機能は、前記クライアントによってサポートされ、各適合機構または機能は属性を有し、
前記2つのパーティの1つによって、該2つのパーティの他の1つへ1以上の適合機構または機能を示す情報を出力し、
前記情報に応答して、前記他のパーティから、前記パーティへメッセージを搬送し、前記1以上の適合機構または機能のサポートを認識することによって特徴付けられる方法。 - 前記1つのパーティは、前記サーバであり、かつ、前記他のパーティは、前記クライアントであって、
前記クライアントは、前記応答メッセージ内で、前記1以上の適合機構または機能を規定する前記属性を用いてサポートを認識することを特徴とする請求項5に記載の方法。 - 前記1つのパーティは、前記クライアントであり、かつ、前記他のパーティは、前記サーバであって、
前記クライアントは、複数の属性を出力し、かつ、
前記サーバは、前記サポートを認識するための前記出力情報に基づいて1以上の前記出力属性を選択することを特徴とする請求項5に記載の方法。
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WO2004072765A2 (en) | 2004-08-26 |
WO2004072766A2 (en) | 2004-08-26 |
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