A Concurrent Transmission for Improving Throughput in Wireless LANs

Concurrent Access in Wireless LANs

Net throughput with IEEE 802.11 wireless LANs

The throughput for IEEE 802.11 wireless LANs has been evaluated with respect to various kinds of overhead. The impact of several sources of overhead has been modeled. Sources include gap time, preamble, PHY (physical layer), MAC (medium access layer) and TCPRP header fields, ACK (acknowledgement) and request frames. After measurement of the net throughput and detailed monitoring of actual excha...

Improving the Aggregate Throughput of Access Points in IEEE 802.11 Wireless LANs

In IEEE 802.11 wireless LANs, the DCF access method and the PCF access method operate alternatively within a superframe to service the time-varying traffic demands. Due to different medium access mechanisms deployed by DCF and PCF, they work well for some particular types of traffic scenarios respectively, while their performance may degrade under some other types of traffic demands. None of th...

Proportional fair throughput allocation in multirate IEEE 802.11e wireless LANs

Under heterogeneous radio conditions, Wireless LAN stations may use different modulation schemes, leading to a heterogeneity of bit rates. In such a situation, 802.11 DCF allocates the same throughput to all stations independently of their transmitting bit rate; as a result, the channel is used by low bit rate stations most of the time, and efficiency is low. In this paper, we propose a more ef...

Providing Throughput Guarantees in IEEE 802.11e Wireless LANs

The upcoming new standard IEEE 802.11e aims at providing Quality of Service (QoS) support in 802.11 Wireless LANs. While the QoS mechanisms in 802.11e, namely the EDCF and the HCF, have already been defined in the standard draft, the challenge lies in the configuration of these mechanisms in order to provide the desired services. In this paper, we deal with the configuration of the EDCF in orde...