Optimal Mode Selection Algorithms for Device-to-Device Communications in LTE-A Networks

Abstract

Device-to-device (D2D) communications are proposed to reduce the burden on cellular system We survey papers related D2D communication in the last five years Also we introduced some optimization works in these papers and started this thesis based on their results In order to make the thesis easy to understand the first half thesis introduced the basic concept of cellular system the multiple access techniques and the wireless channel models The second half is the main contribution for this thesis The mode selection problem for D2D communications have been discussed in previous works However most of their proposals are heuristic algorithms and none of them proposed efficient algorithms to solved the scenarios discussed in the thesis We are the first to prove the linear programming can be used to solve this mode selection problem and the answer would not change under the heavy loaded cellular network Moreover we proposed the algorithm for relatively light loaded cellular network Since we can not prove that the linear programming can be used or not we applied Lagrangian multipliers to narrow down the feasible domain of this problem However this scenario can still solved by linear programming relaxation according to the results of simulations In the nutshell we can obtain the optimal solution in efficient way for above scenarios

Date of Award	2017 Aug 1
Original language	English
Supervisor	Hsiao-Hwa Chen (Supervisor)