Showing papers by "Barry G. Evans published in 2016"
04 Dec 2016
TL;DR: Numerical results show that the proposed scheme in HCNs can increase the network coverage probability by more than 200% compared with the single- tier networks, and insights are provided into the efficient use of cache in the 5G software defined networking (SDN).
Abstract: The emerging 5G wireless networks will pose extreme requirements such as high throughput and low latency. Caching as a promising technology can effectively decrease latency and provide customized services based on group users behaviour (GUB). In this paper, we carry out the energy efficiency analysis in the cache-enabled hyper cellular networks (HCNs), where the macro cells and small cells (SCs) are deployed heterogeneously with the control and user plane (C/U) split. Benefiting from the assistance of macro cells, a novel access scheme is proposed according to both user interest and fairness of service, where the SCs can turn into semi- sleep mode. Expressions of coverage probability, throughput and energy efficiency (EE) are derived analytically as the functions of key parameters, including the cache ability, search radius and backhaul limitation. Numerical results show that the proposed scheme in HCNs can increase the network coverage probability by more than 200% compared with the single- tier networks. The network EE can be improved by 54% than the nearest access scheme, with larger research radius and higher SC cache capacity under lower traffic load. Our performance study provides insights into the efficient use of cache in the 5G software defined networking (SDN).
18 citations
07 Jul 2016
TL;DR: Numerical results show that, by optimizing the key parameters, the hybrid satellite and terrestrial network can achieve nearly 90% EE gain with only 3% SE loss in relative dense networks, and achieve both higher EE and SE gain in sparse networks toward the future 5G green communication networks.
Abstract: With the worldwide evolution of 4G generation and revolution in the information and communications technology(ICT) field to meet the exponential increase of mobile data traffic in the 2020 era, the hybrid satellite and terrestrial network based on the soft defined features is proposed from a perspective of 5G. In this paper, an end-to-end architecture of hybrid satellite and terrestrial network under the control and user Plane (C/U) split concept is studied and the performances are analysed based on stochastic geometry. The relationship between spectral efficiency (SE) and energy efficiency (EE) is investigated, taking consideration of overhead costs, transmission and circuit power, backhaul of gateway (GW), and density of small cells. Numerical results show that, by optimizing the key parameters, the hybrid satellite and terrestrial network can achieve nearly 90% EE gain with only 3% SE loss in relative dense networks, and achieve both higher EE and SE gain (20% and 5% respectively) in sparse networks toward the future 5G green communication networks.
17 citations
25 Feb 2016
TL;DR: A self-organized resource allocation SO-RA scheme is proposed for an orthogonal frequency division multiple access based macro-femto network to mitigate co-layer interference in the downlink transmission and exhibits better performance than the existing state-of-the-art resource allocation schemes.
Abstract: This paper investigates the radio resource management RRM issues in a heterogeneous macro-femto network. The objective of femto deployment is to improve coverage, capacity, and experienced quality of service of indoor users. The location and density of user-deployed femtos is not known a-priori. This makes interference management crucial. In particular, with co-channel allocation to improve resource utilization efficiency, RRM becomes involved because of both cross-layer and co-layer interference. In this paper, we review the resource allocation strategies available in the literature for heterogeneous macro-femto network. Then, we propose a self-organized resource allocation SO-RA scheme for an orthogonal frequency division multiple access based macro-femto network to mitigate co-layer interference in the downlink transmission. We compare its performance with the existing schemes like Reuse-1, adaptive frequency reuse AFR, and AFR with power control one of our proposed modification to AFR approach in terms of 10 percentile user throughput and fairness to femto users. The performance of AFR with power control scheme matches closely with Reuse-1, while the SO-RA scheme achieves improved throughput and fairness performance. SO-RA scheme ensures minimum throughput guarantee to all femto users and exhibits better performance than the existing state-of-the-art resource allocation schemes.Copyright © 2014 John Wiley & Sons, Ltd.
14 citations
01 Sep 2016
TL;DR: An architecture of a future multibeam High Throughput Satellite (HTS) system capable of offering greater flexibility to both feeder links and user links is discussed and analysed, allowing the resources to be allocated more efficiently and resulting in a system optimised holistically.
Abstract: In this paper, we discuss and analyse an architecture of a future multibeam High Throughput Satellite (HTS) system capable of offering greater flexibility to both feeder links and user links, allowing the resources to be allocated more efficiently and resulting in a system optimised holistically. This architecture considers a time switched payload. Beam hopping is used in the user links and a similar form in the feeder links. A user beam is served by a number of gateways and not just one. This scheme allows the progressive deployment of gateways in the system, without compromising the service or the coverage of the system.
11 citations
TL;DR: High Throughput Satellites (HTS) and Throughput Optimization are studied to improve the ability of satellites to communicate with each other and provide real-time information about their orbits.
Abstract: Keywords:
Ka band;
High Throughput Satellites (HTS);
High Capacity Satellites;
Throughput Optimization
3 citations
15 May 2016
TL;DR: The paper proposes the possibility of reusing the satellite feeder uplink band in the full-duplex small cells with virtually no interference from the small cells to the incumbent in-orbit satellite receiver.
Abstract: The demand for wider bandwidths has motivated the need for wireless systems to migrate to higher frequency bands. In line with this trend is an envisaged deployment of Ka-band (or mmWave) cellular infrastructure. Further, to improve the spectral efficiency, developing full-duplex radio transceivers is gaining momentum. In view of this move, the paper proposes the possibility of reusing the satellite feeder uplink band in the full-duplex small cells. The motivation for such a reuse is two-fold :(a) there is virtually no interference from the small cells to the incumbent in-orbit satellite receiver, and (b) directive feeder antennas, with possibly additional isolation and processing causing negligible interference to the small cells. The presented interference analysis clearly supports the proposed coexistence.
3 citations