Download e-book for kindle: Access Networks: 4th International Conference, AccessNets by Xiao Jun Hei, Lawrence Cheung

By Xiao Jun Hei, Lawrence Cheung

ISBN-10: 3642116639

ISBN-13: 9783642116636

This booklet constitutes the completely refereed post-conference court cases of the Fourth foreign convention on entry Networks, AccessNets 2009, held in Hong Kong, China, in November 2009. The eleven revised complete papers awarded including eight invited papers have been rigorously reviewed and chosen. The papers current unique and basic examine advances within the zone of entry networks, corresponding to hybrid dynamic bandwidth and wavelength allocation set of rules, various purposes in EPON, unsolicited furnish companies (UGS), cellular WiMAX community, FiWi networks, built-in PON-WiMAX networks, cognitive radio networks, effective and dynamic spectrum sharing, cross-layer routing procedure for SCTP, and vectored DSL.

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Additional resources for Access Networks: 4th International Conference, AccessNets 2009, Hong Kong, China, November 1-3, 2009, Revised Selected Papers (Lecture Notes of the Institute ... and Telecommunications Engineering, 37)

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2 Case 2 This case refers to the scenario shown in Fig. 3b. The distances from S1 to R1, R1 to S2 and S2 to R2 are 220m, 400m and 220m respectively. Flow S1→R1 begins its transmission at t = 0. At time = 4s, flow S2→R2 starts. The performance of the two links and total network throughput are shown in Fig. 9. 11 RcvAssist S2→R2 RcvAssist 0 0 10 20 30 Time [sec] 40 50 0 0 10 20 30 Time [sec] 40 50 420 0 10 20 30 Time [sec] 40 50 Fig. 9. 11 and RcvAssist 36 C. -T. Lea, and A. -S. Wong results are similar to that in Case 1.

As a result, the chances of R1’s acquiring the channel will be less and less over time. The impact of unfairness at the MAC layer will get amplified in higher layer protocols. 11 standard), the MAC protocol would treat the link between S1 and R1 as broken and reports a link failure to the routing layer. This triggers route failure recovery at the network layer and all packets routed through S1 with R1 as the next hop destination will be dropped. Thus no packets can reach the destination until a new route is established by the routing protocol.

Derived from the analytical insights, we proposed a new protocol RcvAssist for fairness enhancement in CSMA/CA wireless networks. The simulation results of various scenarios indicate that the new protocol not only significantly improves the fairness of the CSMA/CA protocol, but also increases the overall throughput without introducing other side effects, such as aggregating the hidden terminal problem. The added feature is easy to implement and the concept is applicable to the design of future MAC protocols.

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Access Networks: 4th International Conference, AccessNets 2009, Hong Kong, China, November 1-3, 2009, Revised Selected Papers (Lecture Notes of the Institute ... and Telecommunications Engineering, 37) by Xiao Jun Hei, Lawrence Cheung


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