Paper Info
Title
100+ VoIP Calls on 802.11b: The Power of Combining Voice Frame Aggregation and Uplink-Downlink Bandwidth Control in Wireless LANs
Abstract
The bandwidth efficiency of voice over IP (VoIP) traffic on the IEEE 802.11 WLAN is notoriously low. VoIP over 802.11 incurs high bandwidth cost for voice frame packetization and MAC/PHY framing, which is aggravated by channel access overhead. For instance, 10 calls with the G.729 codec can barely be supported on 802.11b with acceptable QoS - less than 2% efficiency. As WLANs and VoIP services become increasingly widespread, this inefficiency must be overcome. This paper proposes a solution that boosts the efficiency high enough to support a significantly larger number of calls than existing schemes, with fair call quality. The solution comes in two parts: adaptive frame aggregation and uplink/downlink bandwidth equalization. The former reduces the absolute number of MAC frames according to the link congestion level, and the latter balances the bandwidth usage between the access point (AP) and wireless stations. When used in combination, they yield superior performance, for instance, supporting more than 100 VoIP calls over an IEEE 802.11b link. The authors demonstrate the performance of the proposed approach through extensive simulation, and validate the simulation through analysis.
Year
DOI
Venue
2007
10.1109/JSAC.2007.070506
IEEE Journal on Selected Areas in Communications
Keywords
Field
DocType
bandwidth usage,downlink bandwidth equalization,absolute number,voip service,access point,incurs high bandwidth cost,adaptive frame aggregation,voip calls,bandwidth efficiency,combining voice frame aggregation,mac frame,channel access overhead,uplink-downlink bandwidth control,wireless lans,voice over ip,downlink,physical layer,wlan,bandwidth,internet telephony,codecs
Computer science,Quality of service,Computer network,Real-time computing,Frame aggregation,Bandwidth (signal processing),Spectral efficiency,Bandwidth management,Codec,Voice over IP,Telecommunications link
Journal
Volume
Issue
ISSN
25
4
0733-8716
Citations 
PageRank 
References 
9
1.06
15
Authors
4
Name
Order
Citations
PageRank
Sangki Yun120516.77
Hyogon Kim249458.48
Heejo Lee31501132.47
Inhye Kang416917.91