Link-level Mechanismls for Extreme Wire essNetworEnvironments
Vijaynarayanan Subramanian, Shivkumar Kalyanaraman · 2007
ratesubsequent tothelink layer's error protection mechaWireless links posesignificant challenges intermsof nisms. achievable goodpnt andresidual loss-rate. Onrrecent Therapid deployment ofbroadband wireless systems enhancements, called LT-TCPmakeTCP loss-tolerant in heavy/bursty erasure environments. Link-level protocols.suasb021 Wireless s(0 wiremitigate theseproblems byusing a combination ofFEC Aliess broadband annighborhood aa reless networks andARQbutareinsufficient whenthechannel experiences raises expectations ofhighend-to-end performance. Fudisruptions. Whentheunderlying source ofloss isinter-ture cells maybesmall (around 30m)inorder todeliver ference (e.g., 802.11 environments), MAC-level mechanisms high bandwidth tousers. Thisleads tointerference among misinterpret interference asnoise leading topoorschedul- cells inclose proximity. Moreover, wireless systems oping(e.g., capture effects) andlimit thebenefit oftransport erating inopen-spectrum bands will beusedinenvironlayer mitigation efforts. Wepropose enhancements tolink-mentscharacterized byhigher levels ofinterference, caplevel protocols thatenable survival during disruptions. We explore anadaptive link-level strategy toexport a smallturean duptiopenomena. hisisbecse acces residual loss rate andbounded latency under high loss/ dis-points bymultiple operators orhomeswill besetupmdcruption conditions. Weevaluate theproposed link-level en-pendently, without global planning orcoordination. This hancements, showing thatthecombination withLT-TCPphenomena isalready apparent indensely populated reshelps achieve significant end-to-end performance gains. We idential areas, flats andapartments whereanyclient can also demonstrate thetrade-off between reduced linklayerseealarge number ofaccess points, andcaninterfere with residual loss (byincreasing ARQpersistence) andtransport their transmissions during peak usageperiods evenifthe layer timeouts. client cannot makeanassociation withtheaccess points (i.e., whenaccess control isenabled). Communication