An intra-frame rate control algorithm (Intra-RCA), called SNR-aware Intra-frame Rate Adaption (SIRA), is proposed to enhance the system performance of WiFi in fast time-varying environments. Widely used inter-frame rate control algorithms (Inter-RCA), which select the physical layer (PHY) rate of each frame based on the time averaged frame loss rate and the signal strength statistics, perform poorly for a long aggregate MAC protocol data unit (A-MPDU) due to the channel variation in mobile environments. Unlike the previous approaches, SIRA adapts the PHY rate on intra-frame basis, i.e., the PHY rate is updated in the middle of a frame according to user mobility. The performance of the proposed scheme is also evaluated by a trace-driven link level simulator employing the collected channel traces from real measurements. The simulation results show that SIRA outperforms the standalone Inter-RCA in all tested traces.
[1]
Radha Poovendran,et al.
An energy framework for the network simulator 3 (NS-3)
,
2011,
SimuTools.
[2]
Thomas K. Paul,et al.
Wireless LAN Comes of Age: Understanding the IEEE 802.11n Amendment
,
2008,
IEEE Circuits and Systems Magazine.
[3]
Haitao Wu,et al.
A Practical SNR-Guided Rate Adaptation
,
2008,
IEEE INFOCOM 2008 - The 27th Conference on Computer Communications.
[4]
Srihari Nelakuditi,et al.
AccuRate: Constellation Based Rate Estimation in Wireless Networks
,
2010,
NSDI.
[5]
Lochan Verma,et al.
Collision-Aware Rate Adaptation in multi-rate WLANs: Design and implementation
,
2010,
Comput. Networks.
[6]
Hüseyin Arslan,et al.
Error vector magnitude to SNR conversion for nondata-aided receivers
,
2009,
IEEE Transactions on Wireless Communications.