Time-based fairness improves performance in multi-rate WLANs

摘要: The performance seen by individual clients on a wireless local area network (WLAN) is heavily influenced the manner in which channel capacity allocated. popular MAC protocol DCF (Distributed Coordination Function) used 802.11 networks provides equal long-term transmission opportunities to competing nodes when all experience similar conditions. When similar-sized packets are also used, leads achieved throughputs (throughput-based fairness) among contending nodes. Because of varying indoor conditions, standard supports multiple data rates exploit trade-off between rate and bit error rate. This considerable diversity, particularly congested. Under such throughput-based fairness can lead drastically reduced aggregate throughput. In this paper, we argue advantages time-based fairness, each node receives an share occupancy time. We demonstrate that notion significant improvements while still guaranteeing no worse access than it would single-rate WLAN. describe our algorithm, TBR (Time-based Regulator), runs AP works with any provide regulating packets. Through experiments, show practical backward compatible implementation conjunction existing achieves fairness.