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  1. Proceedings of the 4th ACM international workshop on Wireless mobile multimedia (WOWMOM '01)
  2. Voice transmission in an IEEE 802.11 WLAN based access network
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A framework for the admission control of QoS multicast traffic in mobile ad hoc networks
P-MIP: paging in mobile IP
Tracking Highly Mobile Endpoints
TranScaling: a video coding and multicasting framework for wireless IP multimedia services
A framework for performance evaluation and optimization of an emerging multimedia DS-CDMA network
Mobility support in unified communication networks
Voice transmission in an IEEE 802.11 WLAN based access network
Delay performance of data traffic in a cellular wireless ATM network
ATM connection handover in LEO satellite networks
A software approach to channel-state dependent scheduling for wireless LANs
Service curve assurances versus uplink throughput in CDMA networks

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Voice transmission in an IEEE 802.11 WLAN based access network

Content Provider ACM Digital Library
Author Wolisz, Adam Köpsel, Andreas
Abstract 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.
Starting Page 23
Ending Page 32
Page Count 10
File Format PDF
ISBN 1581133847
DOI 10.1145/605991.605995
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2001-07-21
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Best-effort Ieee 802.11 Pcf Voice transmission Dcf Real-time Scheduling Wlan
Content Type Text
Resource Type Article
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