An Integrated Approach to Enhance TCP Fairness in HCCA Scheduler for 802.11e Wireless LANs
IEEE 802.11e Wireless Local Area Networks (WLANs) specifies Hybrid Coordination Function (HCF) Controlled Channel Access (HCCA) technique which provides prioritized and parameterized Quality-of-Service (QoS) support in multimedia traffic. It does not, however, attain fairness in the sharing of resources with both uplink and downlink flows. There has been extensive research on the fairness at Medium Access Control (MAC) layer whereas research concerning the fairness in Transmission Control Protocol (TCP) is still nascent. TCP based cross-layer optimization approach for the HCCA scheduler brings forward many challenges like unfairness problem of MAC layer and path/bandwidth asymmetry of TCP.