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A Handoff Scheme Directed by Access Points on IEEE 802.11 Wireless Networks
Quality of Server
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|摘要:||IEEE 802.11無線網路提供的行動性為網路使用者帶來更多的便利，如何讓無線行動裝置能夠平滑地在無線基地台(Access Point；AP)之間漫遊，達到無縫交遞，成為無線網路需要克服的問題之一。為降低無線區域網路的交遞延遲對於上層應用程式的影響，我們提出了一個建構於階層式無線網路架構下的快速交遞(Handoff)機制。由於每一個AP所能提供的無線網路服務範圍有限，通常在建構一個無線網路服務區時會使用多個AP共同提供無線網路服務，當無線行動裝置在無線網路服務區中漫遊時，無線行動裝置會依本身與AP之間的訊號品質交遞至適合連線的AP。
在交遞過程中，無線行動裝置使用者正在使用的網路服務會因為無線行動裝置搜尋可連線AP耗費的時間以及切換到新的AP上需要重新連線的影響而遭到中斷。在我們提出的方法中，我們利用IAPP (Inter Access-Point Protocol)來幫助AP完成交遞過程，並配合判斷RSSI (Received Signal Strength Index)來決定交遞時機。交遞過程完全由AP來負責完成，而無線行動裝置則不會發覺自己被AP交遞。此外我們也提出相關的負載平衡機制以平衡各個AP的負載，使網路資源得以平均分配至每個網路使用者。|
Mobility of the IEEE 802.11 wireless network offers more convenient for the network users. How to offer wireless mobile device roam around all of the access point smoothly to reach the handoff of seamless is a challenging issue. we proposed a fast handoff scheme in the infrastructure network for reducing the delay of handoff for application. In general, many AP offer wireless network service area cooperatively while building a wireless network environment. Because the basic service area of AP is limited. The Wireless mobile device is base on signal strength index of APs to decide handoff while roam in wireless network. In process of handoff, the network service that user using will be interrupt because mobile device spent more of time to search new AP and internet re-connected. We not only utilize IAPP (Inter Access-Point Protocol) to help handoff process of AP in our method, but also determine the opportunity of handoff by RSSI (Received Signal Strength Index). The handoff have no effects to the mobile device because all of the handoff process is operated by AP. For averaging the network resource, we also propose the balance of the load scheme to balance the load of APs, additionally.
|Appears in Collections:||電機工程學系所|
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