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Adaptive VoLTE and Data Traffic Offloading with Cell Range Expansion in LTE-A Heterogeneous Networks
Date Issued
2014
Date
2014
Author(s)
Liao, Chih-Cheng
Abstract
As all-IP network is deployed in the near future, voice over LTE (VoLTE) is considered as a solution to provide voice service in LTE network. The explosion of demands for mobile data also spurs LTE to maintain the data rate of cell-edge user. Allocating resource for data and voice usage properly is important. In thesis, there are two kinds of resource of downlink air interface. One is resource block (RB) and another is control channel (CCH) which is used to assign RBs for a user. We use semi-persistent scheduling (SPS) to simulate the result of resource allocation with voice traffic. And we compare the metrics as MOS, R-value and capacity with dynamic scheduling (DS). The number of CCH resources which we needed is significantly reduced by using SPS. Cell range expansion (CRE) is a newly discussed cell association method, and we formulate the solution as an optimization problem which is aim to maximize the summation of two Jain’s fairness indices (JFIs) fractions of virtual load and log normalized throughput by adjusting the CRE bias. The approach is to adjust CRE bias with constrained particle swarm optimization (PSO) to maximize the goal. The aim is to get a proper CRE bias to let voice capacity and 5%-tile data rate increase.
Subjects
第四代行動通訊
語音
混合式流量
毫微型基地台擴展
粒子群聚演算法
Type
thesis
File(s)
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Name
ntu-103-R00942094-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):14e027128c4c9f13b7c0cfe1e46c1a11