Cooperative Communication and Cognitive Radio (CR) Technology in LTE-Advanced

2013 IEEE 11th Malaysia International Conference on Communications (MICC)

Katiran

et al. 2013

Self Cite

This paper addressed the problem of decentralized and non-cooperative resource allocation among resource sharing base stations in multi-channel wireless access networks. Inspired by cohesion and adhesion properties of liquid form of matter, we propose a sophisticated yet elegant technique in ensuring nearoptimal individual and overall utility of the resource shared base stations. While using game theoretic framework to represent non-cooperative nature of the decision-makers, this scheme will induce cooperation-like behaviour to self-interested players resulting in significant increase of utility and faster convergence as compared to generic distributed resource allocation technique.

Section: B Proposed Algorithm: Erasementioning

confidence: 99%

Liquid properties inspired non-cooperative resource allocation for femtocell networks

Asraf

2013 IEEE 11th Malaysia International Conference on Communications (MICC)

Katiran

et al. 2013

Self Cite

“…The ongoing invention of sophisticated mobile devices increases the requirements of having high data rate transmissions and large network capacity support . Thus, network service providers (i.e.…”

Section: Introductionmentioning

confidence: 99%

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

Maharum

Trans. Emerging Tel. Tech.

et al. 2014

Self Cite

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.

“…As an enhancement to the formerly developed LTE Release 8 standard, the Third Generation Partnership Project (3GPP) working group is currently carrying out studies for LTE-Advanced (or LTE Release 10) [2]. Five key technologies of LTE-Advanced are carrier aggregation, enhanced multiple-input multiple-output (MIMO) transmission (spatial multiplexing of eight layers for downlink and four layers for uplink), coordinated multi-point transmission (CoMP), heterogeneous network and relaying [3][4][5][6].…”

Section: 10 Introductionmentioning

confidence: 99%

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

Ghafar

et al. 2013

Jurnal Teknologi

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.