Capacity analysis of LTE-Advanced HetNets with reduced power subframes and range expansion

The use of reduced power subframes in LTE Rel. 11 can improve the capacity of heterogeneous networks (HetNets) while also providing interference coordination to the picocell-edge users. However, in order to obtain maximum benefits from the reduced power subframes, setting the key system parameters,...

Full description

Saved in:
Bibliographic Details
Published in:EURASIP journal on wireless communications and networking 2014-11, Vol.2014 (1), p.1-19, Article 189
Main Authors: Merwaday, Arvind, Mukherjee, Sayandev, Güvenç, Ismail
Format: Article
Language:English
Subjects:
Aggregates
Bias
Communications Engineering
Computer simulation
Engineering
Information Systems Applications (incl.Internet)
Mathematical models
Networks
Reduction
Research methodologies for performance evaluation of wireless network solutions
Signal,Image and Speech Processing
Stochasticity
Subframes
Wireless communication
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The use of reduced power subframes in LTE Rel. 11 can improve the capacity of heterogeneous networks (HetNets) while also providing interference coordination to the picocell-edge users. However, in order to obtain maximum benefits from the reduced power subframes, setting the key system parameters, such as the amount of power reduction, carries critical importance. Using stochastic geometry, this paper lays down a theoretical foundation for the performance evaluation of HetNets with reduced power subframes and range expansion bias. The analytic expressions for average capacity and 5th percentile throughput are derived as a function of transmit powers, node densities, and interference coordination parameters in a two-tier HetNet scenario and are validated through Monte Carlo simulations. Joint optimization of range expansion bias, power reduction factor, scheduling thresholds, and duty cycle of reduced power subframes is performed to study the trade-offs between aggregate capacity of a cell and fairness among the users. To validate our analysis, we also compare the stochastic geometry-based theoretical results with the real macro base station (MBS) deployment (in the city of London) and the hexagonal grid model. Our analysis shows that with optimum parameter settings, the LTE Rel. 11 with reduced power subframes can provide substantially better performance than the LTE Rel. 10 with almost blank subframes, in terms of both aggregate capacity and fairness.
ISSN:1687-1499
1687-1499
DOI:10.1186/1687-1499-2014-189