100+ VoIP Calls on 802.11b: The power of combining voice frame aggregation and uplink-downlink bandwidth control in wireless LANs

Sangki Yun, Hyogon Kim, Heejo Lee, Inhye Kang

Research output: Contribution to journalArticle

20 Citations (Scopus)

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 a IEEE 802.11b link. We demonstrate the performance of the proposed approach through extensive simulation, and validate the simulation through analysis.

Original languageEnglish
Pages (from-to)689-698
Number of pages10
JournalIEEE Journal on Selected Areas in Communications
Volume25
Issue number4
DOIs
Publication statusPublished - 2007 May

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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