JP2009219127A - 無線通信システムにおける伝送フレーミングのための方法および装置 - Google Patents
無線通信システムにおける伝送フレーミングのための方法および装置 Download PDFInfo
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Abstract
【解決手段】 ブロードキャスト伝送をサポートする無線伝送システムにおける、フレーミングのための方法および装置。フレーミングフォーマットは一方向伝送に固有のフィールドを組み入れ、システムのオーバーヘッドを減少する。一つの実施例は、フレームフィールドの開始および各フレームのペイロードに付加された誤り検出機構を有するHDLCのバージョンを使用する。ここでプロトコル情報は各個々のフレームと共には送信されない。
【選択図】 図11
Description
35U.S.C120条に基づく優先権主張
本特許出願は、60/279,970として提出され、2001年3月28日に提出され、本譲受人に譲渡され、そしてその結果参照によってこの中に明確に組み込まれる、米国仮出願番号60,279,970の優先権を主張する。
本発明は、米国特許商標庁における次の特許出願に関連する。
代理人整理番号010439を有し、本願と同時に出願され、そして本譲受人に譲渡され、そしてここに参照によって明確に組み入れられる、Nikolai Leung氏による、“無線通信システムにおけるオーバーヘッドメッセージングのための方法および装置”、
代理人整理番号010437を有し、本願と同時に出願され、そして本譲受人に譲渡され、そしてここに参照によって明確に組み入れられる、Nikolai Leung氏による、“無線通信システムにおけるブロードキャストサービスオプションの帯域外伝送のための方法および装置”、
代理人整理番号010438を有し、本願と同時に出願され、そして本譲受人に譲渡され、そしてここに参照によって明確に組み入れられる、Nikolai Leung氏による、“無線通信システムにおけるブロードキャストシグナリングのための方法および装置”、
代理人整理番号010500を有し、本願と同時に出願され、そして本譲受人に譲渡され、そしてここに参照によって明確に組み入れらる、Raymond Hsu氏による、“無線通信システムにおけるヘッダ圧縮のための方法および装置”、そして
代理人整理番号010499を有し、本願と同時に出願され、そして本譲受人に譲渡され、そしてここに参照によって明確に組み入れられる、Raymond Hsu氏による、“無線通信システムにおけるデータトランスポートのための方法および装置”。
本発明は、一般的に無線通信システム、そしてとくに無線通信システムにおける伝送のための準備におけるメッセージ圧縮のための方法および装置に関する。
無線通信システムにおけるパケット化されたデータサービス(packetized data services)に対する増加しつつある要求が存在する。従来の無線通信システムは音声通信のために設計されているので、データサービスをサポートするための拡張には多くの課題を持ち込んでいる。帯域幅の維持は大部分の設計者にとって圧倒的な関心事である。
ここに開示された実施例は、データ処理システムにおいてデータパケットをフレーミングするための方法を与えることによって、上に述べられたニーズを扱うものである。
用語“典型的な”は、ここでは“例、事実、あるいは例証として有用”を意味するために限定的に使用されている。ここで“典型的な”として述べられたいかなる実施例も、他の実施例よりも優れて望ましい、あるいは有利であるとして解釈される必要はない。
典型的な実施例は、ブロードキャストサービスをサポートする拡散スペクトル無線通信システムを使用している。無線通信システムは、音声、データ、およびその他の種々の形式の通信を与えるために広く展開されている。これらのシステムは、符号分割多元接続(CDMA)、時間分割多元接続(TDMA)、あるいは若干の他の変調技術に基づくことが可能である。CDMAシステムは、システムの他の形式よりすぐれたシステム容量の増加を含む確実な利点を与える。
図2に、無線通信システム200が示されている。ここで、ビデオおよびオーディオ情報はパケッタイズドデータサービスネットワーク(PDSN)202に与えられる。ビデオおよびオーディオ情報は、テレビ放送されたプログラミングあるいはラジオ伝送からであることが可能である。情報はIPパケット内等のパケット化されたデータとして与えられる。PDSN202は、アクセスネットワーク(AN)の中での分配のためにIPパケットを処理する。示されたように、ANは複数のMS206と通信中のBS204を含むシステムの一部として定義される。PDSN202は、BS204に結合される。HSBSサービスのためにBS204はPDSN202から情報のストリームを受信し、そしてシステム200内の加入者への選定されたチャネル上に情報を与える。
自由アクセス、制御されたアクセス、および部分的に制御されたアクセスを含むHSBSサービスのための、いくつかの可能性のある予約/収入模型が存在する。自由アクセスに対してはサービスの受信に際して予約は必要とされない。BSは暗号化することなしに内容を放送し、そして関心のある移動体は内容を受信することが可能である。サービスプロバイダのための収入は、ブロードキャストチャネル内にまた送信されることが可能な広告を通じて発生されることができる。たとえば、現れようとしている映画クリップスは、それに対して撮影所がサービスプロバイダに支払いをするであろうために送信されることが可能である。
HSBSサービスオプションは、(1)プロトコルスタック、(2)プロトコルスタック内のオプション、および(3)サービスを確立しそして同期するための手順によって定義される。典型的な実施例に従ったプロトコルスタックは、図3および4に示されている。図3に示されたように、プロトコルスタックは基幹施設エレメントすなわち典型的実施例におけるMS、BS、PDSNおよびCSに対して特有である。
図5は、与えられたシステムトポロジーに対する典型的な実施例の呼フローを示している。システムは、水平軸上に示されたように、MS、BS、PDSN、およびCSを含む。垂直軸は時刻を表す。ユーザすなわちMSは、HSBSサービスに対する加入者である。時刻t1において、MSおよびCSはブロードキャストサービスのための予約セキュリティを取り決める。取り決めは、ブロードキャストチャネル上の放送内容を受信するために使用される暗号化鍵等の交換および維持を含む。ユーザは、暗号情報の受信に関するCSとのセキュリティ提携を確立する。暗号情報は、CSからのブロードキャストアクセス鍵(BAK)あるいは鍵組み合わせ等を含むかも知れない。典型的な実施例によれば、CSはパケットデータセションの期間中、
PPP,WAP、あるいは他の帯域外の方法等によって、専用チャネル上に暗号情報を与える。
典型的な実施例によれば、放送内容は専用のブロードキャストチャネル上に送信される。トランスポートレイヤは、IPパケット内の放送内容を搬送するための暗号オーバーヘッドを与える。システムはデータ圧縮およびとくにヘッダ圧縮をサポートする。データを圧縮する決定は、必要とされる平均スループット(トランスポート/暗号オーバーヘッド、データリンクレイヤオーバーヘッド、および物理レイヤオーバーヘッドを含む)および放送品質のユーザ知覚次第である。各IPパケット内においてより大きい放送内容を搬送することは、オーバーヘッドを減少ししたがってブロードキャストチャネル帯域幅を減少する。対照的に、圧縮はユーザ知覚に影響するパケット誤りレート(PER)を増加する。これは、複数の物理レイヤフレームに亙る各々長いIPパケットの伝送に起因し、そしてその結果フレーム誤りレート(FER)の増加と関連づけられる。もしも搬送波が放送品質を改善するために小さいIPパケットを使用すると決定した場合は、搬送波はIPパケットのトランスポートおよび暗号オーバーヘッドを減少するためにヘッダ圧縮を選択することが可能である。
データリンクレイヤフレーミングプロトコルあるいはトランスポートレイヤプロトコルは、ブロードキャストチャネルから受信されたパケットを正確に記述するために、PDSNおよびMSの間で適用される。図3を参照して、LINK LAYERとして識別されたトランスポートレイヤ内の情報は、PDSNおよびMSの間に与えられる。このフレーミング情報はPDSNにおいて発生され、BSを経てMSに与えられる。PDSNはCSからのIPストリームを受信し、そしてあらかじめ設定されたフレーミングプロトコルに従ってIPストリームをフレームする。典型的な実施例に示されたように、PDSNは高レベルデータリンク制御(HDLC;High-Level Data Link Control)のフレーミングプロトコルバージョンを適用する。ISO標準に定義されたHDLCは、国際標準化機構(ISO)7−レイヤードアーキテクチャにおけるレイヤ2に対応し、ここでレイヤ2はデータリンクレイヤとして参照される。HDLCプロトコルは、ネットワークノード間に誤りのないデータの移動を与えるように動作する。このために、HDLCレイヤは次のレイヤに渡されたデータの完全性を保証するように設計される。換言すれば、フレーミングプロトコルは、受信されたデータを、データが最初に送信されたように、正確に、誤りなく、情報の損失がなく、そして正しい順序で再生成するように動作する。
システム1000に対する一般的なアクセスネットワークトポロジーは、CS1002、PDSN1004、および2個のPCF、PCF1 1006およびPCF2 1008を有して図13に示される。図13は、システム1000に示された各基幹施設エレメントからの伝送を定義しているデータグラムを含む。示されたように、CS1002は情報のIPパケットを準備し、そしてパケットをペイロードおよびインナーヘッダH1を有している少なくとも1個のフレーム内に送信する。インナーヘッダはソースおよび宛先情報を有し、ここでソースはCS1002を識別しそして宛先は予約グループを識別する。CS1002はフレームを、宛先予約グループを一組のアクティブユーザ内の個々の加入者に対してマップするPDSN1004に送信する。
Claims (15)
- ブロードキャスト伝送をサポートする無線伝送システムにおいてパケットをフレーミングするための方法であって、
伝送のためのインターネットプロトコル(IP)パケットの部分を発生し、
IPパケットの部分にフレームインジケータの開始部を付加し、
IPパケットの部分に誤り検出機構を適用し、
フレームインジケータの開始部、IPパケットの部分、および誤り検出機構を有する伝送のためのフレームを準備し、そして
プロトコル情報なしにフレームを送信する、
ことを含む方法。 - ここでフレームインジケータの開始部はあらかじめ設定されたビットのシーケンスであり、本方法はさらに、
IPパケットの部分があらかじめ設定されたビットのシーケンスを含む場合は、IPパケットの部分の中にクラシファイヤを挿入することを含む、
請求項1記載の方法。 - ここでクラシファイヤはエスケープキャラクタに対応する請求項2記載の方法。
- ここで誤り検出機構はフレームチェックシーケンスである請求項1記載の方法。
- 搬送波で送信される通信信号であって、
ディジタル情報に関するインターネットプロトコル(IP)の、少なくとも一部分に対応するペイロード部分、
ペイロード部分に対応し、そしてIPパケット内のペイロード部分の状態を識別するフレーム部分の開始部、
そして、ペイロード部分を確認するための誤り検出部分、
を含む通信信号。 - ここでフレーム部分の開始部は、あらかじめ設定されたビットのシーケンスであり、そして
ここでペイロード部分があらかじめ設定されたビットのシーケンスを含む場合は、ペイロード部分はさらにクラシファイヤ部分を含む、
請求項5記載の方法。 - ブロードキャスト伝送をサポートする無線伝送システムにおいて、フレーム化されたパケットを受信するための方法であって、
パケット伝送のフレームを受信し、なお、フレームはフレーム部分の開始部、ペイロード部分、および誤り検出部分を有しており、なおフレームはプロトコル情報を含んでおらず、
パケット伝送における開始フレームとしてフレームを識別し、
フレームの誤り検出部分を用いてフレームを確認し、そして
フレームのペイロード部分を処理する、
ことを含む方法。 - ここでフレームインジケータの開始部があらかじめ設定されたビットのシーケンスである場合、そして、
ここでペイロード部分があらかじめ設定されたビットのシーケンスを含む場合は、ペイロード部分はさらに、ペイロード内のあらかじめ設定されたビットのシーケンスを識別するためにクラシファイヤを含む、
請求項7記載の方法。 - ここでクラシファイヤはエスケープキャラクタを定義する請求項8記載の方法。
- さらに、ペイロード内のクラシファイヤを識別し、そして
クラシファイヤなしにペイロードを処理することを含む、
請求項8記載の方法。 - ここで誤り検出部分はフレームチェックシーケンスである請求項1記載の方法。
- ブロードキャスト伝送をサポートする無線伝送システムにおいて、パケットをフレーミングするための装置であって、この装置は、
伝送のためのインターネットプロトコル(IP)の部分を発生するための手段、
IPパケットの部分にフレームインジケータの開始部を付加するための手段、
フレームインジケータの開始部、IPパケットの部分、および誤り検出機構を有する、伝送のためのフレームを準備するための手段、そして
プロトコル情報なしにフレームを送信するための手段、
を含む装置。 - ブロードキャスト伝送をサポートする無線伝送システムにおいて、フレーム化されたパケットを受信するための装置であって、この装置は、
パケット伝送のフレームを受信するための手段、なおフレームはフレーム部分の開始部、ペイロード部分、および誤り検出部分を有し、なおフレームはプロトコル情報を含んでおらず、
パケット伝送における開始フレームとしてフレームを識別するための手段、
フレームの誤り検出部分を使用してフレームを確認するための手段、そして
フレームのペイロード部分を処理するための手段、
を含む装置。 - 計算機により読み出し可能な記憶ユニットに、記憶された計算機プログラムであって、なお、この計算機プログラムは、ブロードキャスト伝送をサポートする無線伝送システムにおいてパケットをフレーミングするためのものであり、この計算機プログラムは、
伝送のためのインターネットプロトコル(IP)パケットの部分を発生するための命令の第1の組み合わせ、
IPパケットの部分にフレームインジケータの開始部を付加するための命令の第2の組み合わせ、
IPパケットの部分に誤り検出機構を適用するための命令の第3の組み合わせ、
伝送のためのフレームを準備するための、フレームインジケータの開始部、IPパケットの部分、および誤り検出機構を有する、命令の第4の組み合わせ、および
フレームをプロトコル情報なしに送信するための命令の第5の組み合わせ、
を含む計算機プログラム。 - 計算機により読み出し可能な記憶ユニットに記憶された計算機プログラムであって、なおこの計算機プログラムは、ブロードキャスト伝送をサポートする無線伝送システムにおいて、フレーム化されたパケットを受信するためのものであり、この計算機プログラムは、
パケット伝送のフレームを受信するための命令の第1の組み合わせ、なおフレームはフレーム部分の開始部、ペイロード部分、および誤り検出部分を有しており、なおフレームはプロトコル情報を含んでおらず、
フレームをパケット伝送における開始フレームとして識別するための命令の第2の組み合わせ、
フレームの誤り検出部分を用いてフレームを確認するための命令の第3の組み合わせ、および
フレームのペイロード部分を処理するための命令の第4の組み合わせ、
を含む計算機プログラム。
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- 2002-03-28 BR BRPI0208431-7A patent/BRPI0208431B1/pt unknown
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KR20030088049A (ko) | 2003-11-15 |
CN1524368A (zh) | 2004-08-25 |
CN1524368B (zh) | 2010-05-12 |
CA2442378A1 (en) | 2002-10-10 |
EP2209247A1 (en) | 2010-07-21 |
BRPI0208431B1 (pt) | 2019-02-12 |
EP1389386A2 (en) | 2004-02-18 |
BR0208431A (pt) | 2005-10-25 |
WO2002080488A2 (en) | 2002-10-10 |
JP2013255245A (ja) | 2013-12-19 |
CN101835198B (zh) | 2012-02-29 |
US20020141371A1 (en) | 2002-10-03 |
MXPA03008871A (es) | 2004-05-24 |
AU2002252545A1 (en) | 2002-10-15 |
ES2770179T3 (es) | 2020-06-30 |
TW591961B (en) | 2004-06-11 |
WO2002080488A3 (en) | 2003-12-11 |
CN101835198A (zh) | 2010-09-15 |
US9100457B2 (en) | 2015-08-04 |
JP5738932B2 (ja) | 2015-06-24 |
KR100894232B1 (ko) | 2009-04-20 |
EP2209247B1 (en) | 2019-11-06 |
JP2005509310A (ja) | 2005-04-07 |
CA2442378C (en) | 2013-05-14 |
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