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In VoIP over WLAN (known as VoWLAN) transmission, one of the main problems is that the supported voice channel capacity is relatively low. As an improvement to IEEE 802.11 MAC layer Carrier Sense Multi-Access/Collision Avoidance (CSMA/CA) algorithm, this paper presents Prediction/Collision Avoidance (P/CA) mechanism based on service attribute and cross-layer control. Under this mechanism, there is...
This paper proposes a medium access control (MAC) protocol that provides quality of service (QoS) in voice over IP (VoIP) over Wireless Local Area Networks (WLANs). Our proposed protocol minimizes packet collision and improves voice communication quality in both single-cell and multiple-cell cases. Introduction of the proposed protocol requires only VoIP STA software modification, i.e. replacement...
IEEE 802.16 defines the air interface standard for fixed/mobile broadband wireless access (BWA) metropolitan area networks (MANs), which is expected to support quality of service (QoS) for real time application such as voice over IP (VoIP). However, three major technical problems that stand in the way are: 1) absence of MAC scheduling for supporting codecs with voice activity detector (VAD); 2) absence...
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