NDLI: An experimental study of IEEE 802 . 11 b handover performance and its effect on voice traffic

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An experimental study of IEEE 802 . 11 b handover performance and its effect on voice traffic

Content Provider	Semantic Scholar
Author	Vatn, Jon-Olov
Copyright Year	2003
Abstract	In this study we present experimental results on the performance of the IEEE 802.11b handover mechanism and its effect in terms of loss and delay on an ongoing voice stream. Our results show that the mobile station (STA) does not fully stop communicating during the handover interval, but is able to send and receive some packets via its old access point (AP). When a STA (with the “best” WLAN card tested) received voice traffic generated at 20 ms interval during the handover, 4 packets (in median) were forwarded by the old AP, however, the burst of packets containing losses (and occasionally intermediate successful packets) were only 3 (in median). Upstream data were generally delayed rather than lost, but interestingly the second voice packet buffered during handover was lost for the WLAN card (otherwise) considered best. The delay for the upstream packets formed a spike where the first packet was delayed the most and the delay of the following packets decreased roughly linearly. For the “best” card the first packet was delayed 52 ms on average and 3-4 packets were affected in total. When the STA was subject to competing traffic at the new AP, the delays involved increased. There was also a greater variation in handover behavior in that the STA often started to search for new APs without executing the handover (leading to multiple loss burst or delay spikes), and that during a handover more voice data was exchanged between the search and execution phases.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ict.kth.se/~maguire/vatn/research/handover-perf.pdf
Alternate Webpage(s)	http://www.it.kth.se/~vatn/research/handover-perf.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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