Abstract
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 language | English |
|---|---|
| Pages (from-to) | 1382-1390 |
| Number of pages | 9 |
| Journal | IEICE Transactions on Communications |
| Volume | E89-B |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2006 Apr |
| Externally published | Yes |
Keywords
- Channel access
- IEEE 802.11 DCF
- Packet bursting
- Video streaming
ASJC Scopus subject areas
- Software
- Computer Networks and Communications
- Electrical and Electronic Engineering