JP2010213340A - 複数の異種アクセスネットワークを含む通信ネットワークにおけるコンテキストの転送 - Google Patents
複数の異種アクセスネットワークを含む通信ネットワークにおけるコンテキストの転送 Download PDFInfo
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Abstract
【解決手段】複数の異種アクセスネットワークにアクセスし、異種アクセスネットワーク間でハンドオーバを実行する移動端末であって、複数の異種アクセスネットワークに共通なアクセスネットワーク情報転送マネージャから移動端末の近傍における利用可能なアクセスネットワークのリストを含む利用可能アクセスネットワーク情報を受信する受信過程505と、利用可能アクセスネットワーク情報において示された利用可能なアクセスネットワークから信号を受信計測し、利用可能なアクセスネットワークの中からハンドオーバを行うアクセスネットワークを選択する選択過程507と、選択されたアクセスネットワークへのハンドオーバを開始する開始過程508と、を有する。
【選択図】図5
Description
IETF(Internet Engineering Task Force)作業委員会Seamobyは、コンテキスト転送に関する2つのプロトコルを開発した。これらは、Context Transfer Protocol(CTP:非特許文献1参照、すべてのインターネット草案およびRFCはhttp://www.ietf.orgから入手可能)およびCandidate access router Discovery(CARD:非特許文献2参照)である。CTPは、コンテキスト転送を開始し、コンテキストデータを運ぶプロトコルとして機能する。移動ノード、移動前(previous)のアクセスルータ(pAR)および移動先アクセスルータ(nAR)の3者がCTP通信に関与する。これら3者すべては、異なるメッセージタイプによりプロトコル交換を開始することができる。移動ノードがネットワークアクセスポイントの変更を望むか、またはそうしなければならない場合で、移動ノードと移動前のアクセスルータとの接続が既に中断してしまった場合は、移動ノードは、少なくとも移動先アクセスルータに要求を送信する。移動ノードが、CARDを介すなどして移動先アクセスルータのなにがしかの予測を利用する場合、移動ノードは移動先アクセスルータ自体に接続する前に、通信中(previous)のアクセスルータに、予測される移動先(next)アクセスルータへのコンテキスト転送を開始する旨のメッセージを送信することができる。このメッセージは、移動先アクセスルータのIPアドレスと、移動前のアクセスルータにおける移動ノードの古いIPアドレスと、転送されるべきコンテキストデータのリストと、移動先アクセスルータにおいて知られうるIPアドレスと、コンテキストの確実なおよび/または信頼できる転送を要求するフラグとを含む。次に、「特徴コンテキスト(feature context)」と呼ばれるコンテキストデータが別のメッセージで送信される。
無線ローカルエリアネットワーク(WLAN)においては、移動先アクセスポイントにおける再関連付け処理(re−association process)を可能にするハンドオーバに関与するアクセスポイント(AP)間のクライアントまたは基地局(STA)に関する情報が交換される。この再関連付け処理を促進するコンテキスト転送方式が使用される。アクセスポイントとRADIUSサーバの2つの機能エンティティがこのコンテキスト転送に関与する。基地局(STA)に対し、当該管理プロセスは透過的である。RADIUSサーバは、配送された基本サービスセット識別子(BSSID)をIPアドレスにマッピングするタスク、またはアクセスポイントの全指定ドメイン名(FQDN)をマッピングするタスクを遂行する。このマッピングは、アクセスポイントがRADIUSサーバと同じ拡張サービスセット(ESS)に属するかどうかを暗黙に示す。RADIUSサーバはまた、要求があり次第、暗号鍵をアクセスポイントに配布し、2つのアクセスポイント間の暗号化通信を可能にする。この通信は、クライアントのノード間移動を可能にするとともに、一度に1つのアクセスポイントにのみクライアントが関連付けられるようにするすべての管理データを含む。管理メッセージは、コンテキストデータを含みうる。以下のESSの各アクセスポイントは、近傍のアクセスポイントの動的な表示を維持する。この表示は近傍グラフ(Neighbor Graph)とも呼ばれる。
CTPシナリオのアクセスルータと移動ノードに加えて、特許文献1に記載されたメカニズムは、コンテキスト転送が可能な近傍アクセスネットワーク(AN)およびアクセスルータを検索するタスクを果たすポリシーサーバ(PS)を含む(CARDメカニズムに相当する)。当該アクセスネットワークは、ビーコン信号でレイヤ2情報により示され、移動ノードにより受信され、PSによりローカルデータベースにおいて検索される。PSは、近傍のポリシーサーバが移動ノードにサービスすることができる場合は、近傍のポリシーサーバと通信し、近傍のポリシーサーバと事前認証を行う。このメカニズムの1つの欠点は、それがCTPのシナリオよりさらに確実な接続(セキュリティアソシエーション)を必要とするということである。次に、このメカニズムは、移動先アクセスネットワークに送信する前に、動的かつ静的な部分からコンテキストを実際に構築するが、目標のネットワークの特徴あるいは能力を一切考慮しない。
本発明の目的は上述の問題の少なくとも1つを解決することである。
本発明の実施態様による、移動ノードに対するコンテキスト転送を管理する通信ネットワークの構成の概観を図2に示す。本構成は、移動ノードのホームドメインのネットワークと、移動ノード207自身と、アクセスネットワークとにわたって分散している。
Claims (8)
- 複数の異種アクセスネットワークにアクセスし、前記異種アクセスネットワーク間でハンドオーバを実行する移動端末であって、
前記複数の異種アクセスネットワークに共通なアクセスネットワーク情報転送マネージャから前記移動端末の近傍における利用可能なアクセスネットワークのリストを含む利用可能アクセスネットワーク情報を受信する受信手段と、
前記利用可能アクセスネットワーク情報において示された前記利用可能なアクセスネットワークから信号を受信する計測手段と、
前記利用可能なアクセスネットワークの中からハンドオーバを行うアクセスネットワークを選択する選択手段と、
選択されたアクセスネットワークへのハンドオーバを開始する開始手段と、
を有する移動端末。 - 前記異種アクセスネットワークは、少なくともPLMNと無線ローカルエリアネットワークを含む、請求項1記載の移動端末。
- 前記利用可能アクセスネットワーク情報は、前記利用可能なアクセスネットワークの無線アクセスネットワーク識別子を含む、請求項1記載の移動端末。
- 前記信号は、無線アクセスネットワーク識別子が含まれるビーコンメッセージである、請求項1記載の移動端末。
- 複数の異種アクセスネットワークにアクセスし、前記異種アクセスネットワーク間でハンドオーバを実行する移動端末で用いられる通信方法であって、
前記複数の異種アクセスネットワークに共通なアクセスネットワーク情報転送マネージャから前記移動端末の近傍における利用可能なアクセスネットワークのリストを含む利用可能アクセスネットワーク情報を受信するステップと、
前記利用可能アクセスネットワーク情報において示された前記利用可能なアクセスネットワークから信号を受信するステップと、
前記利用可能なアクセスネットワークの中からハンドオーバを行うアクセスネットワークを選択するステップと、
選択されたアクセスネットワークへのハンドオーバを開始するステップと、
を有する通信方法。 - 前記異種アクセスネットワークは、少なくともPLMNと無線ローカルエリアネットワークを含む、請求項5記載の通信方法。
- 前記利用可能アクセスネットワーク情報は、前記利用可能なアクセスネットワークの無線アクセスネットワーク識別子を含む、請求項5記載の通信方法。
- 前記信号は、無線アクセスネットワーク識別子が含まれるビーコンメッセージである、請求項5記載の通信方法。
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EP03026069A EP1531645A1 (en) | 2003-11-12 | 2003-11-12 | Context transfer in a communication network comprising plural heterogeneous access networks |
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CN1902978B (zh) | 2010-05-05 |
JP4950322B2 (ja) | 2012-06-13 |
RU2009120221A (ru) | 2010-12-10 |
EP2278840A1 (en) | 2011-01-26 |
CN101883349B (zh) | 2012-09-26 |
WO2005051026A1 (en) | 2005-06-02 |
JP5503620B2 (ja) | 2014-05-28 |
US20100142484A1 (en) | 2010-06-10 |
US8897257B2 (en) | 2014-11-25 |
JP4707671B2 (ja) | 2011-06-22 |
CN101883349A (zh) | 2010-11-10 |
KR101116507B1 (ko) | 2012-02-28 |
KR101097635B1 (ko) | 2011-12-22 |
ATE483336T1 (de) | 2010-10-15 |
EP2278840B1 (en) | 2013-05-15 |
KR20060123309A (ko) | 2006-12-01 |
BRPI0416563A (pt) | 2007-02-27 |
US7688785B2 (en) | 2010-03-30 |
CN1902978A (zh) | 2007-01-24 |
EP1692903B1 (en) | 2010-09-29 |
BRPI0416563B1 (pt) | 2017-12-26 |
JP2012050130A (ja) | 2012-03-08 |
RU2006120487A (ru) | 2007-12-27 |
RU2367117C2 (ru) | 2009-09-10 |
KR20110042247A (ko) | 2011-04-25 |
EP1531645A1 (en) | 2005-05-18 |
US20070110009A1 (en) | 2007-05-17 |
EP1692903A1 (en) | 2006-08-23 |
JP2007511147A (ja) | 2007-04-26 |
DE602004029395D1 (de) | 2010-11-11 |
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