000211045 001__ 211045
000211045 005__ 20190416055548.0
000211045 037__ $$aCONF
000211045 245__ $$aCSMA/CA in Time and Frequency Domains
000211045 269__ $$a2015
000211045 260__ $$bIEEE$$c2015
000211045 336__ $$aConference Papers
000211045 520__ $$aIt has recently been shown that flexible channelization, whereby wireless stations adapt their spectrum bands on a per-frame basis, is feasible in practice. In this paper, we propose TF-CSMA/CA, an algorithm for flexible channelization that schedules packets in time and frequency domains. TFCSMA/CA is a simple extension of the CSMA/CA protocol used by IEEE 802.11. Contrary to existing channelization schemes, it is entirely distributed and it reacts only to packet collisions, successful transmissions and carrier sensing. With TF-CSMA/CA, when a station is involved in a collision, it performs backoff in both time and frequency domains. Backing off also in the frequency domain allows the transmitters to be much more efficient and aggressive in the time domain, which significantly reduces the severe overheads present with recent 802.11 PHY layers. The main challenge, however, is that the stations need some level of self-organization in order to find spectrum bands of variable widths that minimize interference, while still efficiently using the available spectrum. Using analysis and simulations, we show that such an extension of CSMA/CA to the frequency domain drastically improves both throughput and fairness. Notably, it enables the stations to find interference-free spectrum bands of appropriate size using no communication – relying only on collisions and successes as implicit signals.
000211045 6531_ $$aScheduling
000211045 6531_ $$aTime
000211045 6531_ $$aFrequency
000211045 6531_ $$aFlexible Channelization
000211045 6531_ $$aSpectrum Assignment
000211045 6531_ $$a802.11
000211045 6531_ $$aBackoff Mechanism
000211045 6531_ $$aCSMA/CA
000211045 6531_ $$aSpectrum Shaping
000211045 6531_ $$aRandom Access
000211045 6531_ $$aPerformance Evaluation
000211045 700__ $$0244094$$aHerzen, Julien$$g167320
000211045 700__ $$aBanchs, Albert
000211045 700__ $$aShneer, Vsevolod
000211045 700__ $$0240373$$aThiran, Patrick$$g103925
000211045 7112_ $$aIEEE ICNP$$cSan Francisco, CA$$dNovember 10-13, 2015
000211045 8564_ $$s320080$$uhttps://infoscience.epfl.ch/record/211045/files/tf-icnp15.pdf$$yPublisher's version$$zPublisher's version
000211045 909C0 $$0252454$$pLCA3$$xU10431
000211045 909CO $$ooai:infoscience.tind.io:211045$$pconf$$pIC$$qGLOBAL_SET
000211045 917Z8 $$x167320
000211045 917Z8 $$x167320
000211045 937__ $$aEPFL-CONF-211045
000211045 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000211045 980__ $$aCONF