Consistent-coverage Oriented AP Deployment Optimization in Cell Free and Legacy Coexistence Network
To address the issue of dramatic fluctuations in user experience in legacy cellular networks,cell-free and legacy coexistence networks deploy Access Points(APs)into cellular networks,which can significantly improve the coverage signal quality of edge users and blind areas.Therefore,a good and consistent user experience at any location in the coverage area,i.e.consistent-coverage is the primary goal to improve the performance of coexistence networks.As the AP deployment is the determinant of user transmission rate and coverage in coexistence networks,a consistent-coverage oriented AP deployment optimization problem is designed.Firstly,the expression of the downlink achievable rate of each user is derived based on the joint transmission model of coexistence network.Secondly,a ratio sum optimization problem is proposed to maximize the average throughput.Finally,the non-convex problem is transformed into a convex optimization problem by using the fractional programming and the introduction of auxiliary variables,where the AP deployment scheme is obtained by the iterative solution.Compared with the legacy cellular networks,the simulation results demonstrate that the proposed scheme can significantly increase average throughput of the edge and blind areas.
Wireless communicationCell-free and legacy coexistence networkConsistent coverageJoint transmissionAP deployment
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