Journal ArticleDOI
Heterogeneous cellular networks: From theory to practice
Amitava Ghosh,Nitin Mangalvedhe,Rapeepat Ratasuk,Bishwarup Mondal,Mark Cudak,Eugene Visotsky,T. A. Thomas,Jeffrey G. Andrews,Ping Xia,Han-Shin Jo,Harpreet S. Dhillon,Thomas David Novlan +11 more
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TLDR
New theoretical models for understanding the heterogeneous cellular networks of tomorrow are discussed, and the practical constraints and challenges that operators must tackle in order for these networks to reach their potential are discussed.Abstract:
The proliferation of internet-connected mobile devices will continue to drive growth in data traffic in an exponential fashion, forcing network operators to dramatically increase the capacity of their networks. To do this cost-effectively, a paradigm shift in cellular network infrastructure deployment is occurring away from traditional (expensive) high-power tower-mounted base stations and towards heterogeneous elements. Examples of heterogeneous elements include microcells, picocells, femtocells, and distributed antenna systems (remote radio heads), which are distinguished by their transmit powers/ coverage areas, physical size, backhaul, and propagation characteristics. This shift presents many opportunities for capacity improvement, and many new challenges to co-existence and network management. This article discusses new theoretical models for understanding the heterogeneous cellular networks of tomorrow, and the practical constraints and challenges that operators must tackle in order for these networks to reach their potential.read more
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Posted Content
Coordinated Tethering for Multi-RAT Cellular Networks: An Algorithmic Solution and Performance Analysis
TL;DR: This paper proposes a novel communication paradigm to satisfy the performance demands of future wireless networks: a hybrid Cellular/WLAN network architecture with wireless offloading, and presents a novel scheme for achieving frequency reuse equal to one within a single macro-cell, under specific performance criteria and constraints.
Proceedings ArticleDOI
Joint user association and BS on-off scheduling in heterogeneous networks
TL;DR: This work shows that multiple pico cells per hot spot can significantly extend capacity but the gains can only be realized in conjunction with on-off scheduling of the picocells, and develops tight capacity bounds which can be used to investigate larger networks in cases where the size of the LP is too large for direct solution.
Proceedings ArticleDOI
User association to small cells in the presence of Nakagami-m fading and co-channel interference
TL;DR: The effects of MU density, SBS transmit power, association threshold, path-loss exponent, and amount of co-channel interference on the association performance of SBSs deployed over a cellular network are studied.
Dissertation
Performance analysis of mobile relays for LTE
TL;DR: This thesis investigates the deployment of mobile relay in LTE network from two aspects: mobility management and performance and proposes a TDD/FDD hybrid mobile relay mode, motivated by the fact that a vehicular UE is static relative to its serving mobile relay and close to it, which leads to a relatively good channel condition on the access link.
Posted Content
Noncooperative Precoding for Massive MIMO HetNets: SILNR Maximization Precoding
Deokhwan Han,Namyoon Lee +1 more
TL;DR: This paper presents a novel noncooperative massive MIMO precoding technique called signal-to-interference-plus-leakage- plus-noise-ratio (SILNR) maximization precoding, and shows that the proposed precoding method considerably outperforms the existingnoncooperative precoding techniques in terms of the ergodic spectral efficiencies and rate distributions per user.
References
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Journal ArticleDOI
Femtocell networks: a survey
TL;DR: The technical and business arguments for femtocells are overview and the state of the art on each front is described and the technical challenges facing femtocell networks are described and some preliminary ideas for how to overcome them are given.
Journal ArticleDOI
Modeling and Analysis of K-Tier Downlink Heterogeneous Cellular Networks
Abstract: Cellular networks are in a major transition from a carefully planned set of large tower-mounted base-stations (BSs) to an irregular deployment of heterogeneous infrastructure elements that often additionally includes micro, pico, and femtocells, as well as distributed antennas. In this paper, we develop a tractable, flexible, and accurate model for a downlink heterogeneous cellular network (HCN) consisting of K tiers of randomly located BSs, where each tier may differ in terms of average transmit power, supported data rate and BS density. Assuming a mobile user connects to the strongest candidate BS, the resulting Signal-to-Interference-plus-Noise-Ratio (SINR) is greater than 1 when in coverage, Rayleigh fading, we derive an expression for the probability of coverage (equivalently outage) over the entire network under both open and closed access, which assumes a strikingly simple closed-form in the high SINR regime and is accurate down to -4 dB even under weaker assumptions. For external validation, we compare against an actual LTE network (for tier 1) with the other K-1 tiers being modeled as independent Poisson Point Processes. In this case as well, our model is accurate to within 1-2 dB. We also derive the average rate achieved by a randomly located mobile and the average load on each tier of BSs. One interesting observation for interference-limited open access networks is that at a given \sinr, adding more tiers and/or BSs neither increases nor decreases the probability of coverage or outage when all the tiers have the same target-SINR.
Journal ArticleDOI
Heterogeneous Cellular Networks with Flexible Cell Association: A Comprehensive Downlink SINR Analysis
TL;DR: A tractable framework for SINR analysis in downlink heterogeneous cellular networks (HCNs) with flexible cell association policies is developed and the average ergodic rate of the typical user, and the minimum average users throughput - the smallest value among the average user throughputs supported by one cell in each tier is derived.
Journal ArticleDOI
LTE-advanced: next-generation wireless broadband technology [Invited Paper]
TL;DR: An overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed, which includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, and heterogeneous networks with emphasis on Type 1 and Type 2 relays.
Journal ArticleDOI
Interference coordination and cancellation for 4G networks
TL;DR: Viable approaches include the use of power control, opportunistic spectrum access, intra and inter-base station interference cancellation, adaptive fractional frequency reuse, spatial antenna techniques such as MIMO and SDMA, and adaptive beamforming, as well as recent innovations in decoding algorithms.