Communications in Computer and Information Science: Techniques on Relaying for LTE-Advanced Network

Ghafar, Aimi Syamimi Ab; Satiman, N.; Fisal, Norsheila; Maharum, Siti Marwangi Mohamad; Saparudin, Faiz Asraf; Rashid, Rozeha Abdul; Yusof, Sharifah Kamilah Syed; Katiran, Norshida

doi:10.1007/978-3-642-25462-8_56

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…network operators) are seeking for an advanced wireless technology that is able to accomplish such requirements. For that reason, LTE‐Advanced system has been introduced by the Third Generation Partnership Project (3GPP) and has emerged as the most promising candidate to realise such network necessities .…”

Section: Introductionmentioning

confidence: 99%

A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks

Maharum

Fisal

et al. 2014

Trans. Emerging Tel. Tech.

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Successful deployment of femtocells within a macrocell coverage area would be hindered if cross‐layer and co‐layer interference in such heterogeneous networks (HetNets) is not properly mitigated. Through spectrum management, cross‐layer interference between macrocell and femtocell network layers can be avoided by assigning the network layers with orthogonal spectrum bands. However, the orthogonal spectrum assignments in prior works are no longer effective because they may not guarantee the variation of users' traffic demand in HetNets to be satisfied all the time. Therefore, a centralised and dynamic orthogonal spectrum assignment called demand‐based spectrum orthogonalisation (DeBaSO) is proposed in this paper to address the interference issues in downlink of LTE‐Advanced HetNets. In our proposed scheme, the problem of orthogonal spectrum assignment is formulated with the objective to maximise the overall system throughput based on the requirement of physical spectral resources to satisfy the users' traffic demand. Additionally, the co‐layer interference among femtocells is avoided by grouping the adjacent femtocells into different femtocell clusters. To do so, typical model of spatial frequency reuse is exploited in this paper. In this way, femtocells that are grouped within the same cluster can universally reuse the assigned spectrum resource without creating co‐layer interference among them. Numerical results indicate that the proposed scheme achieves a remarkable performance in terms of overall system throughput and spectrum efficiency because the cross‐layer and co‐layer interference is entirely avoided. The achievements prove that DeBaSO scheme overcomes the limitations found in other orthogonal spectrum assignments, which were previously proposed in the literature. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks

Maharum

Fisal

et al. 2014

Trans. Emerging Tel. Tech.

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Machine-to-Machine Sensor Data Multiplexing Using LTE-Advanced Relay Node for Logistics

Ahmad

Marwat

Zaki

et al. 2015

Dynamics in Logistics

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Spectral-efficiency and Demand-based Joint Relay and Bandwidth Assignment for Cooperative Relay Network

Ghafar

Fisal

et al. 2013

Jurnal Teknologi

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Cooperative communication system by exploiting multiple relay nodes (RN) offers significant performance improvement in terms of coverage and capacity. However, using all available RNs in the network is not optimal. Some RNs are located far from user equipment (UE), or having bad link quality due to fading and shadowing. Therefore, only several RNs with good link quality to the UE need to be chosen. Furthermore, in a high user density network, bandwidth is limited which requires proper resource allocation. In addition, each UE has different traffic demand to be satisfied. There are scenarios where eNodeB (eNB) and RN are wasting their resources to UE with low demand, whereas the resources can be used for different UE to compensate for its high demand. In this project, joint problem of relay and bandwidth assignment in a network with heterogeneous user traffic are studied. Accordingly, a Spectral-efficiency and Demand-based Joint Relay and Bandwidth Assignment (SE-D-JRBA) scheme is proposed which is flexible for network with diverse user traffic demands. Numerical evaluation is analyzed for SE-D-JRBA with full-duplex (FDX) and half-duplex (HDX) RN and decode-and-forward (DCF) operation, hence compared to system without relay cooperation. The results demonstrated that the proposed method obtained good system efficiency and fairness.

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Communications in Computer and Information Science: Techniques on Relaying for LTE-Advanced Network

Cited by 5 publications

References 13 publications

A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks

A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks

Machine-to-Machine Sensor Data Multiplexing Using LTE-Advanced Relay Node for Logistics

Spectral-efficiency and Demand-based Joint Relay and Bandwidth Assignment for Cooperative Relay Network

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