多重介面移動質點在All-IP網路的閒置模式管理方法

Abstract

在異質表層無線網路，擁有多重無線介面的移動質點可以同時連結到多種網路並且得到多個IP位址。為了使通信者無論何時都能藉由移動點的任一IP位址與之通信，移動點必須保持全部的介面開啟，好去接收進來的封包。不幸地，過去的研究指出，裝備多重介面的移動點，即使是在介面處於閒置的時候，仍擁有嚴重的耗電問題。這篇論文，提出了多重介面的閒置模式管理以及位置更新方法。閒置模式管理方法，在移動點上，僅維持一個開啟的無線介面並關掉所有其它的無線介面來使耗能減到最小。藉由適當地更新家代理上的登錄，通信點寄送到關掉介面的IP位址上的封包，被路遊到開啟的介面作為呼叫訊息，因此關掉的介面能被叫醒和通信者通訊。此外，這篇論文，為了進一步減少關掉介面的呼叫延遲，詳細地探討了位置更新的方法。模擬的結果，驗證提出的方法遠比傳統的方式，節省更多電，也改良了延遲問題。

In a heterogeneous overlay wireless network, a mobile node (MN) with multiple wireless interfaces can attach to various networks and obtains multiple IP addresses simultaneously. To allow correspondent nodes (CNs) to connect to an MN at anytime through any MN’s IP address, an MN must keep its interfaces awake to receive incoming packets. Unfortunately, previous studies indicate that the power consumption of an MN with multiple interfaces poses a serious problem, even when interfaces are idle. In this paper, idle-mode management and location update schemes for a mobile node with multiple interfaces are presented. The idle-mode management schemes maintain only one interface awake and turn off completely other interfaces of an MN to minimize its power consumption. By updating proper binding information on home agents (HAs), packets sent from a CN to the IP addresses associated with the turned-off interfaces are routed to the MN through the awake interface as paging messages, and thus the turned-off interfaces can be woken up to communicate with the CN. Moreover, location update schemes are elaborated in this paper in order to further minimize the paging delay for the turned-off interfaces. Simulation results demonstrate that the proposed schemes outperform the conventional approaches in terms of energy consumption and paging delay.