TY - GEN
T1 - A hybrid channel scan mechanism for improved VoIP handoff performance in 802.11 WLANs
AU - Huang, Jeng Ji
AU - Chang, Sen Ching
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
KW - Handoff
KW - IEEE 802.11
KW - Voice over Internet Protocol (VoIP)
KW - Wireless local area network (WLAN)
UR - http://www.scopus.com/inward/record.url?scp=69949142087&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=69949142087&partnerID=8YFLogxK
U2 - 10.1109/PIMRC.2008.4699873
DO - 10.1109/PIMRC.2008.4699873
M3 - Conference contribution
AN - SCOPUS:69949142087
SN - 9781424426447
T3 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
BT - 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
T2 - 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
Y2 - 15 September 2008 through 18 September 2008
ER -