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

Jeng-Ji Huang, Sen Ching Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
DOIs
Publication statusPublished - 2008 Dec 1
Event2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008 - Poznan, Poland
Duration: 2008 Sep 152008 Sep 18

Publication series

NameIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

Other

Other2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
CountryPoland
CityPoznan
Period08/9/1508/9/18

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Keywords

  • Handoff
  • IEEE 802.11
  • Voice over Internet Protocol (VoIP)
  • Wireless local area network (WLAN)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Huang, J-J., & Chang, S. C. (2008). A hybrid channel scan mechanism for improved VoIP handoff performance in 802.11 WLANs. In 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008 [4699873] (IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC). https://doi.org/10.1109/PIMRC.2008.4699873