Joint Optimization of Coordinated Scheduling and Resource Allocation in LTE-Advanced Heterogeneous Networks
Date Issued
2012
Date
2012
Author(s)
Chiang, Yao-Pang
Abstract
Resource allocation and transmission scheduling are two key issues in the next-generation communication system. Unlike related work that focuses mostly on homogeneous networks, we consider in this thesis a heterogeneous network with macro BSs and several low-power remote radio heads (RRHs). The goal is to perform coordinated scheduling among heterogeneous transmission points through proper resource allocation for all users in the OFDMA-based system. To proceed, we first formulate an optimization problem that takes into consideration resource allocation and transmission scheduling across all scheduling slots.
Since the computation complexity is prohibitive, we then transform the one-shot optimization problem into an iterative scheduling problem. While the transformed problem exhibits some performance degradation initially, as the amount of scheduling slots increases, its performance
improves and closely tracks the original formulation with significantly lower complexity. Based on insights from solving the optimization problem, we then propose a coordinated scheduling algorithm to dynamically allocate resources of all transmission points to users based on the perceived performance and channel variation. Through proper control of fairness and aggregate capacity, the algorithm can achieved the desired performance and outperforms approaches proposed in related work. We thus motivate further investigation for joint coordinated scheduling and
resource allocation across heterogeneous transmission points in the next-generation wireless system.
Subjects
coordinated scheduling
resource allocation
Type
thesis
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