关键词: 蜂窝IP, IEEE 80211, 越区切换, 性能分析

Abstract:

The delay performance of the indirect handoff scheme (IHS) experienced by constant bit rate (CBR) traffic was analyzed first, and the result shows this scheme in cellular IP (CIP) protocol cannot guarantee zero packet loss during the handoff process. Slow route updating and long access time to the new base station (BS) are the two main reasons leading to the potential packet loss. In order to mitigate the influence of these two problems, an enhanced indirect handoff scheme (EIHS) was proposed. Simplified routing updating (SRU) and handoff buffering (HBUF) were adopted to improve the IHS in the CIP. The results of the theoretical analysis and NS2 simulation show that packet loss of the real time traffic during the handoff can be reduced dramatically with the EIHS.

Key words: cellular IP, IEEE 802.11, handoff, performance evaLuation