Transmission Point Selection for Delay Minimization in LTE-Advanced Heterogeneous Networks
Date Issued
2012
Date
2012
Author(s)
Yang, Kai-Min
Abstract
Abstract Support of heterogeneous networks is a very important issue in next-generation LTE-Advanced systems. Transmission point selection in particular plays a key role in determining the performance of the system. In this thesis, we consider a scenario with a macro BS and several low-power RRHs within a cell. We start from the conventional transmission point selection problem, where each user can select only one transmission point for service. We formulate an optimization problem for transmission point selection by minimizing the total transmission delay. Compared with the conventional objective function for maximizing total system throughput, the formulated problem can significantly lower the total transmission delay while ensuring a certain degree of fairness among users. To solve the optimization problem, we propose a fast algorithm based on the concept of the Gibbs sampler and achieve a performance that is close to the optimal result. Built on the solution for the conventional transmission point selection problem, we then consider the scenario of coordinated multi-point transmission (CoMP), where users are allowed to select two or more transmission points for joint transmission and RRHs form non-overlapping clusters to reuse frequency resources. By dividing the available frequency band into the CoMP band and non-CoMP band, CoMP users and non-CoMP users can select individual transmission points for service. Simulation results show that, with the proposed transmission point selection algorithm, the total transmission delay can be reduced by 40% and fairness can be improved by 50% on average. The scenario with CoMP has an additional reduction of 10% in the total transmission delay and 10% improvement in fairness.
Subjects
Heterogeneous networks
RRH
CoMP
Gibbs sampler
Type
thesis
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