Exploiting transmission opportunities in heterogeneous wireless networks:a transmission power saving perspective

Exploiting transmission opportunities in dimensions of user equipments(UEs),radio access networks(RANs),and radio resource units(RRUs),in heterogeneous wireless networks(HWNs),we focus on a new perspective of saving the uplink transmission power,so as to lengthen the battery life time of UEs.Moreover,to ensure the quality of service for each UE,we guarantee each a minimal transmission rate.To achieve the above HWN control objective,we have to make an efcient matching among UEs,RANs,and RRUs,which is formulated as a binary linear optimization problem.Due to its NP-hard complexity,we develop a rate-power efciency based HWN control algorithm with low computational complexity.We verify the performance of our HWN control scheme through simulation.Extensive simulation results demonstrate the advantage of our HWN control method in saving the uplink transmission power and guaranteeing the UE transmission rate requirement.