Access Networks: 4th International Conference, AccessNets by Xiao Jun Hei, Lawrence Cheung
By Xiao Jun Hei, Lawrence Cheung
This ebook constitutes the completely refereed post-conference lawsuits of the Fourth overseas convention on entry Networks, AccessNets 2009, held in Hong Kong, China, in November 2009. The eleven revised complete papers provided including eight invited papers have been rigorously reviewed and chosen. The papers current unique and primary study advances within the region of entry networks, comparable to hybrid dynamic bandwidth and wavelength allocation set of rules, different purposes in EPON, unsolicited furnish providers (UGS), cellular WiMAX community, FiWi networks, built-in PON-WiMAX networks, cognitive radio networks, effective and dynamic spectrum sharing, cross-layer routing process 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)
Example text
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. This is the same scenario used in [29] for studying ad hoc wireless networks.
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.
Overall throughput without introducing other side effects, such as aggregating the hidden terminal problem. The resulting protocol retains the advantages of both sender-initiated and receiver- initiated MACs. The rest of the paper is organized as follows. Section 2 presents the related work. Section 3 analyzes the success probabilities of RTS receptions and RTS/CTS handshakes of the disadvantaged link. Based on the results derived from Section 3, Section 4 presents the fairness enhancement feature.