On the self-similar nature of Ethernet traffic (extended version)
IEEE/ACM Transactions on Networking (TON)
Distributed fair scheduling in a wireless LAN
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Scheduling of real-time traffic in IEEE 802.11 wireless LANs
Wireless Networks
Investigation of the IEEE 802.11 Medium Access Control (MAC) Sublayer Functions
INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
The Havana Framework for Supporting Application and Channel Dependent QOS in Wireless Networks
ICNP '99 Proceedings of the Seventh Annual International Conference on Network Protocols
Voice over wireless LAN: a fine-scalable channel-adaptive speech coding scheme
Proceedings of the 3rd ACM international workshop on Wireless mobile applications and services on WLAN hotspots
Improving loss resilience with multi-radio diversity in wireless networks
Proceedings of the 11th annual international conference on Mobile computing and networking
IEEE/ACM Transactions on Networking (TON)
WLAN VoIP capacity allocation using an adaptive voice packetization server
Computer Communications
Multi-radio diversity in wireless networks
Wireless Networks
EURASIP Journal on Wireless Communications and Networking - Multimedia over Wireless Networks
Dynamic polling mechanism for enhancing voice transmission in IEEE 802.11e wireless LANs
International Journal of Wireless and Mobile Computing
Multimedia applications over metropolitan area networks (MANs)
Journal of Network and Computer Applications
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IEEE 802.11 contains a mechanism for transmission of data with realtime constraints known as Point Coordination Function. This supplementary medium access protocol resides on top of the basic medium access mechanism Distributed Coordination Function and uses a centralized polling approach. Due to the complexity of a PCF implementation and the predicted inefficiency of the PCF several proposals have been presented for providing QoS support without the need of a centralized scheduler. Those solutions suffer from the fact that they are shifting implementation complexity from the access point to the mobile nodes. In this paper we compare the suitability of the basic DCF and PCF protocols for the transmission of audio data in an interactive scenario. We show that a simple priority mechanism used on the mobiles as well as the access point is suitable for providing improved QoS in terms of band-width and without the need of an extended DCF protocol. In combination with the PCF an adequate delay characteristic for audio flows is achievable as well. To overcome the limitations in channel capacity caused by the PCF we suggest an implicit signaling scheme for improving the channel capacity by avoiding unsuccessful PCF polling attempts.