A hybrid channel scan mechanism for improved VoIP handoff performance in 802.11 WLANs

Jeng Ji Huang*, Sen Ching Chang

*此作品的通信作者

研究成果: 書貢獻/報告類型會議論文篇章

摘要

Seamless handoffs with Quality of Service (QoS) guarantee play a decisive role in the provision of realtime applications such as Voice over Internet Protocol (VoIP) over IEEE 802.11 networks. During a handoff process, a channel scan needs to be first performed in order to discover new access points (APs), and it can be done by either passively listening to beacon signals or actively exchanging probe messages with new APs. We have previously presented a channel scan algorithm, in which voice activity is taken into consideration and beacon listening is scheduled only during silent periods of a VoIP conversation. To further improve handoff performance, a hybrid channel scan mechanism is proposed in this paper, wherein beacon listening is first performed in a handoff, and, after reaching a switching time running estimated during the beacon listenings, probe exchanging can be incorporated to enable the success of the handoff. Extensive simulation results show that the proposed mechanism effectively reduces both packet loss rate and handoff failure probability.

原文英語
主出版物標題2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
DOIs
出版狀態已發佈 - 2008
事件2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008 - Poznan, 波兰
持續時間: 2008 九月 152008 九月 18

出版系列

名字IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

其他

其他2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
國家/地區波兰
城市Poznan
期間2008/09/152008/09/18

ASJC Scopus subject areas

  • 電氣與電子工程

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