Radio resource management considerations for LTE Femto cells

Kulkarni, Parag; Chin, Woon Hau; Farnham, Tim

doi:10.1145/1672308.1672314

Cited by 64 publications

(30 citation statements)

References 2 publications

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“…Moreover, the backhaul capacity itself can also fluctuate as a result of traffic load variations at the ISP core network. Consequently, the performance of the femtocell operation can considerably be degraded, thus leading to inability to maintain the required QoS [6]. Current femtocell deployments address this issue by operating in closed mode, thus limiting the number of users that can have access to the femtocell.…”

Section: Introductionmentioning

confidence: 99%

A context-aware framework for the efficient integration of femtocells in IP and cellular infrastructures

Makris

Νομικός

Skoutas

et al. 2013

J Wireless Com Network

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In today's heterogeneous networking (HetNet) environments, where end users are provided with universal connectivity opportunities, femtocell deployments can become key players in the enhancement of critical performance indicators such as capacity, coverage, QoS, etc. In order to confront the up-to-date LTE femtocell challenges, we propose a context-aware framework that provides a controlled environment from the femtocell point of view, which is required for applicable functionality. More specifically, we aim to (a) control the local environment where the femtocell is placed within, by efficiently managing the total incoming traffic load and by continuously adjusting the distribution of the backhaul capacity among the coexisting networks and (b) control the macro-femto interference caused by macrocell users transmitting close to the femtocell by investigating the "femtocell as a relay" concept. Finally, the performance of the proposed framework is evaluated via simulation results showing that the overall performance of a HetNet environment can be leveraged in terms of QoS requirements, energy saving and data rate enhancement.

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Section: Introductionmentioning

confidence: 99%

A context-aware framework for the efficient integration of femtocells in IP and cellular infrastructures

Makris

Νομικός

Skoutas

et al. 2013

J Wireless Com Network

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“…The spectrum has to be efficiently allocated in the femtocell network to mitigate the interference problem. In [9][10][11][12], interference avoidance strategies were developed in a coexisting environment of macrocells and femtocells. 2-Self-optimization and auto-configuration: The femtocell is expected to operate in a plug and play fashion to ease installation, configuration, and management.…”

Section: Introductionmentioning

confidence: 99%

Optimized spectrum sensing algorithms for cognitive LTE femtocells

Abdelmonem

Nafie

Ismail

et al. 2012

J Wireless Com Network

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In this article, we investigate to perform spectrum sensing in two stages for a target long-term evolution (LTE) signal where the main objective is enabling co-existence of LTE femtocells with other LTE femto and macrocells. In the first stage, it is required to perform the sensing as fast as possible and with an acceptable performance under different channel conditions. Toward that end, we first propose sensing the whole LTE signal bandwidth using the fast wavelet transform (FWT) algorithm and compare it to the fast Fourier transform-based algorithm in terms of complexity and performance. Then, we use FWT to go even deeper in the LTE signal band to sense at multiples of a resource block resolution. A new algorithm is proposed that provides an intelligent stopping criterion for the FWT sensing to further reduce its complexity. In the second stage, it is required to perform a finer sensing on the vacant channels to reduce the probability of collision with the primary user. Two algorithms have been proposed for this task; one of them uses the OFDM cyclic prefix for LTE signal detection while the other one uses the primary synchronization signal. The two algorithms were compared in terms of both performance and complexity.

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“…With the coverage of neighboring femtocells overlapped, their FUEs may interfere with one another. The femtocell interference occurs when radio resources with the same frequency and time slot are allocated to overlapping FUEs [6], [7]. There are two categories of femtocell interference specified by the network tier or the frequency.…”

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confidence: 99%

“…When a larger number of neighbors are densely deployed, severe co-tiered interference arises more often and is difficult to manage [6], [10]- [12]. The deployment of femtocells in an urban area typically leads to overlapping coverage areas of multiple neighboring femtocells [6]. For example, the deployments are likely to be in adjacent houses or blocks of apartments [4].…”

mentioning

confidence: 99%

“…Since a flexible resource assignment technique alleviates co-channel interference, the orthogonal frequency-division multiple access (OFDMA), intensely considered by 3GPP long-term evolution (LTE), is considered in this paper. In addition, since OFDMA reduces the interference from the adjacent cells operating in the same frequency by assigning different sets of orthogonal frequencies in different cells, the effect of adjacent-channel interference can be ignored [6]. The OFDMA exploits multiuser diversity by assigning resources according to the channel qualities of FUEs.…”

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confidence: 99%

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Resource Allocation with Interference Avoidance in OFDMA Femtocell Networks

Liang

Chung

et al. 2012

IEEE Trans. Veh. Technol.

159

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Abstract-Interference control and quality-of-service (QoS) awareness are the major challenges for resource management in orthogonal frequency-division multiple access femtocell networks. This paper investigates a self-organization strategy for physical resource block (PRB) allocation with QoS constraints to avoid the co-channel and co-tiered interference. Femtocell self-organization including self-configuration and self-optimization is proposed to manage the large femtocell networks. We formulate the optimization problem for PRB assignments where multiple QoS classes for different services can be supported, and interference between femtocells can be completely avoided. The proposed formulation pursues the maximization of PRB efficiency. A greedy algorithm is developed to solve the resource allocation formulation. In the simulations, the proposed approach is observed to increase the system throughput by over 13% without femtocell interference. Simulations also demonstrate that the rejection ratios of all QoS classes are low and mostly below 10%. Moreover, the proposed approach improves the PRB efficiency by over 82% in low-loading scenario and 13% in high-loading scenario.Index Terms-Femtocell, interference avoidance, orthogonal frequency-division multiple access (OFDMA), resource allocation, resource reuse.

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Radio resource management considerations for LTE Femto cells

Cited by 64 publications

References 2 publications

A context-aware framework for the efficient integration of femtocells in IP and cellular infrastructures

A context-aware framework for the efficient integration of femtocells in IP and cellular infrastructures

Optimized spectrum sensing algorithms for cognitive LTE femtocells

Resource Allocation with Interference Avoidance in OFDMA Femtocell Networks

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