Dual token bucket based HCCA scheduler for IEEE 802.11e WLAN

  • Authors:

  • Dong-Yul Lee;Chae-Woo Lee

  • Affiliations:

  • Ajou University, Suwon, Korea;Ajou University, Suwon, Korea

  • Venue:
  • Proceedings of the 4th International Conference on Uniquitous Information Management and Communication
  • Year:
  • 2010

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Abstract

IEEE 802.11e proposed by IEEE 802.11 working group to guarantee QoS has contention based EDCA and contention free based HCCA. HCCA, a centralized polling based mechanism of 802.11e, needs a scheduling algorithm to allocate the network resource efficiently. The reference scheduler, however, is inefficient in guaranteeing QoS for real-time services with VBR traffic. To efficiently assign resource for VBR traffic, we propose a novel scheduling algorithm with dual leaky bucket. A bucket is used to control average data rate and maximum burst size, and another is used to control the jitter of a flow. Simulation results show that the proposed algorithm has superior performance to the reference scheduler in terms of delay and packet loss ratio.