In this paper, we propose a consistent random backoff (CRB) scheme to reduce the channel access delay jitter in voice over wireless local area networks. In the CRB scheme, a contention window (CW) size at each backoff stage is determined by hashing the session identifier and the talk spurt index. Therefore, all packets in the same talk spurt of a session have the same CW sizes if they are transmitted at the same backoff stage. Since a modulo-division operation with the identical maximum CW value is applied, fairness with the legacy backoff scheme (i.e., binary exponential backoff) is also provided. Extensive simulation results demonstrate that the CRB scheme can reduce the channel access delay jitter by 54 %.
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The preliminary version of the paper was presented at the IEEE ICCCN Workshop on Performance Modeling and Evaluation in Computer and Telecommunication Networks, Hawaii, USA, August 2011. This research was supported in part by WCU Project (R33-2008-000-10044-0) and in part by the KCC R&D program supervised by the KCA (KCA-2011-08913-04002).
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Pack, S., Kim, K., Kim, W. et al. A Cross-Layer Approach to Reduce Channel Access Delay Jitter in IEEE 802.11 WLANs. Wireless Pers Commun 69, 1379–1390 (2013). https://doi.org/10.1007/s11277-012-0639-x
- Voice over WLANs
- Consistent random backoff
- Binary exponential backoff
- Consistent hashing