Paper Info
Title
Joint Rate and SINR Coverage Analysis for Decoupled Uplink-Downlink Biased Cell Associations in HetNets.
Abstract
Load balancing by proactively offloading users onto small and otherwise lightly-loaded cells is critical for tapping the potential of dense heterogeneous cellular networks (HCNs). Offloading has mostly been studied for the downlink, where it is generally assumed that a user offloaded to a small cell will communicate with it on the uplink as well. The impact of coupled downlink-uplink offloading is not well understood. Uplink power control and spatial interference correlation further complicate the mathematical analysis as compared to the downlink. We propose an accurate and tractable model to characterize the uplink $textnormal{texttt{SINR}}$ and rate distribution in a multi-tier HCN as a function of the association rules and power control parameters. Joint uplink-downlink rate coverage is also characterized. Using the developed analysis, it is shown that the optimal degree of channel inversion (for uplink power control) increases with load imbalance in the network. In sharp contrast to the downlink, minimum path loss association is shown to be optimal for uplink rate. Moreover, with minimum path loss association and full channel inversion, uplink $textnormal{texttt{SIR}}$ is shown to be invariant of infrastructure density. It is further shown that a decoupled association —employing differing association strategies for uplink and downlink—leads to significant improvement in joint uplink-downlink rate coverage over the standard coupled association in HCNs.
Year
DOI
Venue
2014
10.1109/TWC.2015.2437378
Wireless Communications, IEEE Transactions
Keywords
Field
DocType
HetNet, uplink coverage, decoupled association, stochastic geometry, uplink rate distribution
Topology,Mathematical optimization,Load balancing (computing),Power control,Computer network,Association rule learning,Path loss,Interference (wave propagation),Invariant (mathematics),Cellular network,Mathematics,Telecommunications link
Journal
Volume
Issue
ISSN
PP
99
1536-1276
Citations 
PageRank 
References 
95
2.70
28
Authors
3
Name
Order
Citations
PageRank
Sarabjot Singh1140356.34
Xinchen Zhang231113.32
Jeffrey G. Andrews3181021115.64