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CMU CS 15744 - In Defense of Wireless Carrier Sense

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Ramya MudduluriIn Defense of Wireless Carrier SenseIntroduction Carrier Sense uses the feedback from a receiver to decide if the sender should transmit For large networks considering to reuse the network, carrier sense fails due to - Exposed terminal problem- Hidden terminal problemContributions Analysis showing Carrier Sense provides nearly optimal throughput in general case Identification of several distinct behavioral regimes for Carrier Sense, which perform well except one which typically encounters bad behavior A model for high-level properties of adaptive bit-rate radio throughputFormal ModelCarrier Sense Behavior Limiting CasesLong Range Networks When the pairs are far apart (D>>Rmax)- Concurrency is optimal for receivers within Rmax (pairs interfere insignificantly) When the pairs are very close (D<<Rmax)- Multiplexing is optimal (since SNR would approach 0dB)Short Range Networks An interferer who is close enough to cause trouble effects all the receivers. Carrier sense performs well in this case.Preference RegionsChoosing a ThresholdA Comparison of Mechanisms for Improving TCP Performance overWireless LinksIntroduction TCP invokes congestion control and avoidance algorithms to provide a reliable transferProblem Networks with wireless and lossy links suffer from losses due to bit errors and handoffs significantly Even in these scenarios TCP invokes congestion control and avoidance mechanisms which degrades end-to-end performanceApproaches Hide non-congestion-related losses from the sender, so that the problem is solved locally- reliable link-layer protocols (AIRMAIL), split connection (Indirect-TCP), TCP aware link-layer (Snoop protocol) Make the sender realize that the packet losses are not due to congestion.Basic Groups (Solutions) End-to-end proposal- SACKs, ELN,  Split Connection Protocols- Uses NACKs, SACKs between Base Station and Destination Link-layer proposals- Forward Error Corrections (FEC)Evaluation Goodput = Actual transfer size/Total number of bytes transmitted over the path Shielding TCP sender from duplicate ACKs caused by wireless losses improves throughput by 10-30% SACKs, ELN result in significant performance


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CMU CS 15744 - In Defense of Wireless Carrier Sense

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