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SIGCOMM
2009
ACM

Cross-layer wireless bit rate adaptation

12 years 6 months ago
Cross-layer wireless bit rate adaptation
This paper presents SoftRate, a wireless bit rate adaptation protocol that is responsive to rapidly varying channel conditions. Unlike previous work that uses either frame receptions or signal-to-noise ratio (SNR) estimates to select bit rates, SoftRate uses confidence information calculated by the physical layer and exported to higher layers via the SoftPHY interface to estimate the prevailing channel bit error rate (BER). Senders use this BER estimate, calculated over each received packet (even when the packet has no bit errors), to pick good bit rates. SoftRate’s novel BER computation works across different wireless environments and hardware without requiring any retraining. SoftRate also uses abrupt changes in the BER estimate to identify interference, enabling it to reduce the bit rate only in response to channel errors caused by attenuation or fading. Our experiments conducted using a software radio prototype show that SoftRate achieves 2× higher throughput than popular fram...
Mythili Vutukuru, Hari Balakrishnan, Kyle Jamieson
Added 28 May 2010
Updated 28 May 2010
Type Conference
Year 2009
Where SIGCOMM
Authors Mythili Vutukuru, Hari Balakrishnan, Kyle Jamieson
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