Cross-layer Optimization Strategy With Power-controlled Multi-packet Reception

Multi-packet reception technique which has become the focus in wirelessnetwork, can receive multiple copies of data packets at the same time, it reduceschannel conflicts, improves the throughput of wireless network. In this paper, onthe basis of analysis of implement technology in physical layer of mu lti-packetreception, two power-controlled multi-packet strategies are proposed to deal withtwo different types of wireless network structure: single hop single base station andsingle hop multi-base station, by adjusting the transmitting power of nodes. Thesimulations indicate that the multi-packet reception cross-layer strategy canimprove the network throughput significantly. The main research innovation s inthis paper are as follows:(1)Based on the successive interference cancellation technology in physicallayer, power-controlled optimization strategy for multi-packet reception techniquein the single hop single base station wireless network is proposed. First, the modelof data transmission in physic layer is proposed based on the ratio of signal andnoise (SNR) model, with the optimization target of getting the maximum ratechannel, prerequisites for node data can be resolved properly, the linearprogramming model is established, after time slices are divided, the concep"tpowerlevel geometric partition "is presented. The strategy expansion the feasible set, itensures that the strategy can be solved in polynomial time.(2)Power-controlled strategy for multi-packet reception technique in the singlehop multi-base station wireless network is proposed based on single hop single basestation model. The concept"interference aggregate"is proposed to simplify thepowered level strategy and to cope with the cross interference from the nodes of theadjacent base station which caused by the introduction of the base station. First themaximum sets of transmitting nodes of the single base station with the interferencenodes removed were established. Then taking the lowest communication speed ofnode as constraints, choosing the range of the interference nodes’ power level, withthe level-selection strategy it can expansion multi-packet aggregate. The strategycan cope with the mixed integer programming model efficiently.(3)The simulation of the proposed power-control-based multi-packet receptionstrategy with20~50nodesand in1~5base stations shows that the network performance is more than60%better than multi-packet reception strategy in singlebase station mode, when the power-control-based multi-packet reception is adopted.In the single hop multi-base station mode, with the increase of communicationrange, the network performance is notably more when the power-control-basedmulti-packet reception is adopted.