Improved VoIP QoS over Wireless Networks
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Abstract
Voice over Internet Protocol (VoIP) is a famous time-sensitive voice communication application over the Internet. This technology has observed multiplicative growth in both wired as well as wireless networks. Every day thousands of devices are made which are compatible with the 802.11 and experience good throughput at PHY layer due to introduction of 802.11b, 802.11g, 802.11n and 802.11a standards. The Data link layer uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol which allows equal license-free channel sharing between nodes communicating in half duplex mode. CSMA/CA lacks in Quality of Service (QoS) support and priority provision to handle real-time multimedia applications. Challenges of the wireless networks make VoIP implementation a tough task. An amendment of WLANs 802.11e ensures the desired order of preference for channel access to the time-bound applications but the implementation still needs certain points to be considered and worked upon. A novel channel access scheme is developed which ensures QoS of VoIP over any size of wireless network.
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