Co-DRR: An Integrated Uplink and Downlink Scheduler for Bandwidth Management over Wireless LANs

• Venue: ISCC '03 Proceedings of the Eighth IEEE International Symposium on Computers and Communications
• Year: 2003

Bandwidth management over wired bottleneck links has been aneffective way to utilize network resources. For the rapidlyemerging IEEE 802.11 Wireless LAN (WLAN), the limitedWLAN bandwidth becomes a new bottleneck and requiresbandwidth management. Most possible existing solutions onlyexclusively focus on optimizing multimedia traffic, puredownlink or pure uplink fairness, or are incompatible with IEEE802.11. This study proposes a cooperative deficit round robin(co-DRR), an IEEE 802.11-compatible host-based fairscheduling algorithm based on the deficit round robin (DRR) anddistributed-DRR (DDRR) schemes, to cooperate the uplink anddownlink quantum calculations to simultaneously control uplinkand downlink bandwidth. Co-DRR uses the standard PCF modeto utilize the contention-free period to compensate for theunfairness in the contention period. Numerical resultsdemonstrate that: co-DRR can scale up to 100 mobile hosts evenunder high bit error rate (0.0001) while simultaneous achievinguplink/downlink long-term fairness (CoV