Improving videophone transmission over multi-rate IEEE 802.11e networks

Tiantian Guo, Jianfei Cai, Heng Foh Chuan, Yu Zhang

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

6 Citations (Scopus)


In this paper, we propose an adaptive system for improving videophone transmission over EDCA. We consider that a videophone contains a constant bit rate (CBR) voice source and a rate-adaptive video source. Two issues are addressed in this research. Firstly, how to solve the AP bottleneck problem, and secondly, how to adjust video source rate to improve the network performance. For the first issue, we propose the adjustment of the transmission opportunity (TXOP) to give AP a higher priority in voice transmission in order to eliminate the AC3 transmission bottleneck at the AP. For the second issue, our principle is to guarantee the throughput of voice traffic while transmitting as much video traffic as possible. Moreover, we consider more realistic multi-rate WLANs, where multiple transmission rates are used in the PHY layer depending on the underlaying channel conditions.

Original languageEnglish
Title of host publicationICC 2008 - IEEE International Conference on Communications, Proceedings
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages5
ISBN (Print)9781424420742
Publication statusPublished - 2008
Externally publishedYes
EventIEEE International Conference on Communications 2008: Communications: Faster-Higher-Stronger - Crown Plaza Park View, Beijing, China
Duration: 19 May 200823 May 2008 (IEEE Conference Proceedings)


ConferenceIEEE International Conference on Communications 2008
Abbreviated titleICC 2008
Internet address

Cite this