JP4390498B2 - セッション承認制御を与えるためのシステム及び方法 - Google Patents
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Description
以上を鑑みて、本発明の第1の典型的な実施形態は、概して、セッション承認制御を与えるシステムに関する。
図2は、本発明の第1の典型的な実施形態に係る通信レイアウトを示すブロック図である。具体的に、図2は、PDN POP 202と、PDN POP 202に接続されるネットワークピアリングポイントに配置された第2のセッションディレクタ205と、第1の集約領域212と、第2の集約領域252との間の通信レイアウトを示している。
図5は、図3の第1のセッションディレクタ203を使用することによって果たされる機能の概要を与えるフローチャート350である。フローチャート中の任意のプロセス内容すなわちブロックは、特定の論理機能すなわちプロセス中のステップを実施するための1または複数の実行可能な命令を含むコードの一部、モジュール、セグメントを表わしていることは言うまでもない。本発明における当業者であれば分かるように、関連する機能性に応じて、図示され又はここで説明する順序と異なる順序(ほぼ同時に或は逆の順序を含む)で機能を実行できる他の実施も、本発明の第1の典型的な実施形態の範囲内に含まれる。
図6は、ソースから図3の第1のセッションディレクタ203へマルチメディアパケットを送信するために帯域幅を割り当てるステップを示すフローチャート390である。ブロック392によって示されるように、信号パケットがソースから受信されると、信号メッセージのソースアドレスが信号パケットから抽出される。一例として、SIPプロトコル及びMGCPプロトコルにおいて、ソースアドレスは、INVITEメッセージ及びCREATE CONNECTIONメッセージのそれぞれのセッション記述プロトコル(SDP)部分で見出される。
第1のセッションディレクタ203(図3)を使用することによってどのように帯域幅を割り当てるかについて説明するにあたっては、割り当てられた帯域幅の質を決定するとともに、マルチメディアパケットを第1のセッションディレクタ203(図3)に送信するために帯域幅の質が十分であるかどうかを決定することについて述べる(図5のブロック362)。ソースの帯域幅の質は、決定された発生領域に関連付けられたQoSスコアを検索することによって決定されても良い。具体的には、本発明の第1の典型的な実施形態において、領域データベース322(図4)のQoSスコアカラム346(図4)は、発生領域が内部に記憶された発生領域カラム326(図4)内のセルと同じ列内に設けられたセル内に記憶されるQoSスコアに関して検索される。
ソースに関連付けられた帯域幅の質を決定する方法及びマルチメディアパケットフローを承認するために帯域幅の質が十分であるかどうかを決定する方法を説明するにあたって、図7のフローチャート410について述べる。このフローチャートは、領域部分に関して帯域幅を割り当てるステップを示している(図5のブロック364)。
領域部分に関して帯域幅が割り当てられた後(図5のブロック364)、領域部分に関して割り当てられた帯域幅の質が決定される(図5のブロック366)。ソースの帯域幅の質は、決定された領域部分に関連付けられたQoSスコアを検索することによって決定されても良い。具体的には、本発明の第1の典型的な実施形態において、領域データベース322(図4)のQoSスコアカラム346(図4)は、領域部分に関連付けられたQoSスコアに関して検索される。
Claims (9)
- セッションディレクタ(203)であって、
前記セッションディレクタ(203)によって受信されたパケットが信号パケットであるかマルチメディアパケットであるかを判断するパケット分類器(306)と、
ソース(261,271)からの通信セッション要求に応じるように帯域幅を割り当て、前記割り当て帯域幅が、前記ソース(261,271)から前記セッションディレクタ(203)へのマルチメディアパケットフローの送信に適することを確保し、前記割り当て帯域幅のサービスの質がフローを与えるのに適することを確保するように構成された信号プロキシ(314)と、
前記信号プロキシ(314)によって使用されるデータベーステーブル(324)であって、発生領域カラム(326)、領域部分カラム(328)、アドレスカラム(338)、最大帯域幅カラム(342)、割り当て帯域幅カラム(344)、およびサービスの質スコアカラム(346)を有するデータベーステーブルと、
を有するセッションディレクタ(203)。 - 前記パケット分類器(306)は、前記信号パケットを検査し、前記信号パケットから情報を抽出し、有用な情報を含まない前記信号パケットを、前記セッションディレクタ(203)内に設けられたドロップパケットプロセッサ(312)に転送するように構成された請求項1に記載のセッションディレクタ(203)。
- 前記ドロップパケットプロセッサ(312)は、前記セッションディレクタ(203)に送信された信号パケットのソースを識別する請求項2に記載のセッションディレクタ(203)。
- 前記通信セッション要求は、セッション開始プロトコル要求を有する請求項1に記載のセッションディレクタ(203)。
- 前記信号プロキシ(314)は、前記ソース(261,271)の最大サポート帯域幅(342)を決定し且つ前記最大サポート帯域幅(342)によって適応された割り当て帯域幅(344)を割り当てることにより帯域幅を割り当て、前記割り当て帯域幅(344)を前記ソース(261,271)を包含する発生領域(152)によって許容される最大帯域幅と比較することにより、前記割り当て帯域幅(344)が、前記ソース(261,271)から前記セッションディレクタ(203)へのマルチメディアパケットの送信に適することを確保し、前記発生領域(152)に関連付けられたサービスの質スコア(346)を検索し、前記サービスの質スコア(152)を、前記ソース(261,271)からのマルチメディアパケットの送信に必要な所定の帯域幅質レベルと比較し、前記サービスの質スコア(346)が前記所定の帯域幅質レベルを超えた時に前記マルチメディアパケットの送信を許容し、超えない時に前記マルチメディアパケットの送信を防止することにより、前記割り当て帯域幅(344)のサービスの質が前記フローを与えるのに適することを確保する請求項1に記載のセッションディレクタ(203)。
- 前記サービスの質スコア(346)は、前記発生領域(152)から生じるマルチメディアパケットフローの測定されたジター、パケットロス、待ち時間に基づく帯域幅質の数値表示である請求項5に記載のセッションディレクタ(203)。
- 意図する通信セッションにとって望ましい帯域幅の徴候(indicia)を含む通信セッション要求をソースから受信するステップと、
前記通信セッション要求に応じるために、割り当て帯域幅を形成するステップ(360)と、
前記割り当て帯域幅がマルチメディアパケットの送信に適することを確保するステップ(364)と、
前記割り当て帯域幅のサービスの質が、前記割り当て帯域幅によって前記マルチメディアパケットのフローを与えるのに適することを確保するステップ(366)と、
を備えているセッション承認制御を行なう方法であって、
前記割り当て帯域幅のサービスの質がフローを与えるのに適することを確保する前記ステップは、
発生領域に関連付けられたサービスの質スコアを検索するステップと、
前記サービスの質スコアを、前記ソースからのマルチメディアパケットの送信に必要な所定の帯域幅質レベル要件と比較するステップ(362)と、
前記サービスの質スコアが前記所定の帯域幅質レベルを超える時に前記マルチメディアパケットの送信を許容する(374)とともに、超えない時に前記マルチメディアパケットの送信を防止する(382)ステップと、
を更に備える方法。 - 通信セッション要求を受信する前記ステップは、前記要求がセッション開始プロトコル要求に従っていることを確認することを含む請求項7に記載の方法。
- 前記割り当て帯域幅がマルチメディアパケットの送信に適することを確保するステップは、
前記割り当て帯域幅を、前記発生領域によって許容される最大帯域幅と比較するステップ(398)と、
前記割り当て帯域幅が前記発生領域によって許容された最大帯域幅よりも小さい場合に前記マルチメディアパケットを送信し(400)、そうでない場合に前記マルチメディアパケットの送信を防止する(402)ステップと、
を更に備えている請求項7に記載の方法。
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