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By Xiao Jun Hei, Lawrence Cheung

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 offered 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, different functions 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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Read or Download 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) PDF

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Extra 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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T. Lea, and A. -S. Wong rather than solving the fairness issue in the presence of exposed terminals. Reference [8] studies the optimal carrier sensing threshold that can lead to maximum spatial reuse. MACA-P [12] introduces a control gap between the RTS/CTS exchange and the subsequent DATA/ACK exchange to facilitate other pairs to conduct potential concurrent transmission. References [13][14] exploit more concurrent transmission opportunities for exposed terminals via overhearing. DBTMA [15] proposes to use two busy tones to indentify and protect packet transmissions and receptions so that an exposed sender can launch concurrent transmissions if it does not hear reception busy tone.

Flow S1→R1 begins its transmission at t = 0. At t= 4s, flow S2→R2 starts. 4Mbps. 6Mbps at t = 60s. The simulation ends at time =70s. Again, Fig. 11 MAC and flow S1→R1 can maintain a decent throughput level even under this double jeopardy condition. 11 200 100 0 0 10 20 30 40 Time [sec] 50 60 70 Fig. 10. 4 Case 4 This case refers to the multi-hop topology with 7 nodes shown in Fig. 6. Each node is 200m away from its immediate neighbors. Node 1 (n1) is the source node and the last node (n7) the sink.

4. The probabilities of successful RTS reception and RTS/CTS handshake of link S1-R1; From left to right: (a) Analytical results (b) Simulation results of Fig. 4a. (c) Simulation results of Fig. 4b. Packet lengths = 1000 bytes. 4 Proposed Receiver Assistance MAC Protocol The results of Section 3 indicate that there are many RTS packets that can arrive correctly at the R1 of the disadvantage link. To exploit this result, we propose a simple receiver assisted feature. The proposed protocol, called RcvAssist in the paper, can significantly improve the degree of fairness.

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