MAC-layer support for real-time video over IEEE 802.11 DCF networks

Jong Ok Kim, Hideki Tode, Koso Murakami

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


IEEE 802.11 DCF is a contention-based channel access protocol, and medium access delay greatly increases as the number of contending stations in a service area increases. This severely affects on delay-sensitive video applications. In this paper, we focus on MAC-layer solutions for realizing high quality video transmission in 802.11 DCF networks. A new channel access protocol based on the timestamp (TS) of video packets is proposed for real-time video. The TS information is carried by RTP header from the video application to 802.11 MAC. For video packets with the same RTP TS, they are simultaneously transmitted in a single channel access. Additional contention and back-off processes can be avoided because the whole packets of a video frame are completely delivered. The proposed TS-based access protocol can be easily implemented by the DCF with packet bursting. In addition, it is backward compatible to the legacy DCF. Extensive simulations show that the TS-based channel access achieves lower cumulative distributions of application-level video frame delay when compared to the DCF protocol.

Original languageEnglish
Pages (from-to)1382-1390
Number of pages9
JournalIEICE Transactions on Communications
Issue number4
Publication statusPublished - 2006 Apr
Externally publishedYes


  • Channel access
  • IEEE 802.11 DCF
  • Packet bursting
  • Video streaming

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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