Modem battlefield communications environment is very complex,the sensor network is extremely prone to splitting,in this situation the traditional routing protocols will fail,and opportunistic routing is regarded as th...
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Modem battlefield communications environment is very complex,the sensor network is extremely prone to splitting,in this situation the traditional routing protocols will fail,and opportunistic routing is regarded as the most promising *** people have proposed three kinds of routing mechanism to handle the routing problem what the splitting network *** are: "Receive-Carry-Transmit" mechanism;"Multiple Forwarding" mechanism;"Nodes Exchanging Information in Pairs" mechanism,and there have been some routing protocols such as Epidemic,Prophet Router,First Contact Router to use,mere is also *** example,the existing routing algorithm only allows a node to set up one single sending connection at a time,which greatly limits the diffusion rate of data in opportunistic *** this paper,we study the potential benefits of the multiple sending connections between any two nodes which move into each other's communication *** develop a new protocol named MSC which is based on Epidemic *** using "one",which is a dedicated simulation software for opportunistic,the results show that MSC may improve packets diffusion rate in the network and has benefits in terms of the transmission delay and the delivery success rate compared to Epidemic,Prophet Router,and First Contact Router.
Aiming at reducing the outage probability of primary uses(PU)and obtaining spectrum resource for secondary users(SU),in this paper,we propose an adaptive spectrum sharing protocol for PUs and SUs by efficiently employ...
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Aiming at reducing the outage probability of primary uses(PU)and obtaining spectrum resource for secondary users(SU),in this paper,we propose an adaptive spectrum sharing protocol for PUs and SUs by efficiently employing the licensed *** our proposal,SUs can intelligently switch the spectrum sharing strategies between two-path successive relaying(SR)and the opportunity relaying(OR)spectrum sharing *** the cooperation of SUs,the transmission time of PUs can be decreased and the remaining time is allocated for the secondary transmission as a *** the SR strategy,with full consideration the channel state between primary transmit(PT)and the secondary transmit(ST)and the interference between STs,two SUs that can achieve largest secondary transmission time are selected to alternatively relay PUs' signals to meet the primary target transmission rate *** the OR strategy,an optimal SU that can achieve the largest secondary transmission rate is selected for cooperation to satisfy their target transmission *** our SR/OR protocol,the secondary system can access the license spectrum without ***,simulation results show that compared with the conventional cognitive cooperation schemes,the outage performances of both PUs and SUs are improved and the throughput of SUs increases apparently.
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