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2010
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CSMA/CN: carrier sense multiple access with collision notification

8 years 4 months ago
CSMA/CN: carrier sense multiple access with collision notification
A wireless transmitter learns of a packet loss, infers collision, only after completing the entire transmission. If the transmitter could detect the collision early (such as with CSMA/CD in wired networks), it could immediately abort its transmission, freeing the channel for useful communication. There are two main hurdles to realize CSMA/CD in wireless networks. First, a wireless transmitter cannot simultaneously transmit and listen for a collision. Second, any channel activity around the transmitter may not be an indicator of collision at the receiver. This paper attempts to approximate CSMA/CD in wireless networks with a scheme called CSMA/CN (collision notification). Under CSMA/CN, the receiver uses PHY layer information to detect a collision and immediately notifies the transmitter. The collision notification consists of a unique signature, sent on the same channel as the data. The transmitter employs a listener antenna and performs signature correlation to discern this notificat...
Souvik Sen, Romit Roy Choudhury, Srihari Nelakudit
Added 06 Dec 2010
Updated 06 Dec 2010
Type Conference
Year 2010
Where MOBICOM
Authors Souvik Sen, Romit Roy Choudhury, Srihari Nelakuditi
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