Energy efficient resource allocation in LTE-A

We study the resource allocation problem in LTE-A downlink transmissions. Rather than maximizing the capacity, we consider energy metrics at the BS (base station), with certain rate guarantee for each MS (mobile station). Specifically, two energy related problems are investigated. By enabling a tradeoff between the number of PRBs (physical resource blocks) and the consumed power for each MS transmission, the first problem is to minimize the total power at the BS with constant MS rate guarantee. Based on the PRB scheduling, the second problem is to change the power allocation, such that energy efficiency can be maximized by minimizing an EPG (energy-per-goodbit) metric. We propose heuristic algorithms to circumvent the optimization models. Numerical results show that significant power decrease and energy efficiency increase can be achieved by properly trading off between PRBs and power consumptions.