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Fixed relaying with adaptive antenna arrays for the downlink of multihop cellular networks

In future cellular networks, random users' mobility as well as time-varying multimedia traffic activity make cellular networks design a challenging task. To efficiently utilize the limited wireless spectrum, it is crucial to enable cellular systems to reactively and dynamically reconfigure cells' service area and capacity. This paper proposes an effective dynamic directional cell coverage adaptation scheme combined with a rate adaptation scheme that together are aimed maximizing radio resource utilization of Wideband Code Division Multiple Access (WCDMA) systems. This approach has the capability of reconfiguring the cell coverage area online by being aware of the system conditions. It takes into account the load on the uplink direction and the pilot power allocation on the downlink direction. Simulation results show the effectiveness of the proposed scheme in increasing WCDMA system efficiency.

/pdf/a-novel-dynamic-directional-cell-breathing-mechanism-with-41dlbw8s8j.pdf

A Novel Dynamic Directional Cell Breathing Mechanism with Rate Adaptation for Congestion Control in WCDMA Networks

Relay based multihop cellular system is a promising technique to improve the signal quality in wireless networks. Here, we propose the channel partitioning and relay positioning schemes so as to maximize the number of users admitted in a cell. A user is admitted if the required rate can be provided to it. Based on this scheme, Signal to Interference and Noise Ratio (SINR) received by Base Station (BS) and Fixed Relay Nodes (FRN) are analyzed with emphasis on users at disadvantaged places (worst case SINR). The results show that, optimally deploying FRNs reduced the call blocking rates at least by 30% and improve the SINR significantly.

Channel partitioning and relay placement in multi-hop cellular networks

To efficiently utilize the limited spectrum of interference limited Wide-band Code-Division Multiple-Access (WCDMA) cellular networks, transmission rates allocation and base station association for mobile users need to be optimal. In this paper, Power-Controlled Rate and Coverage Adaptation (PCRCA) module is proposed to balance network load, maximize number of users admitted to the system while assuring their Quality of Service (QoS) requirements. It is a cooperative scheme which allows nearby sectors of two adjacent cells to dynamically change their coverage to meet the optimal transmission rates allocation for their mobile users. A heuristic algorithm is implemented to solve an optimization model of the proposed scheme. The obtained power and capacity gains as well as outage probability of the proposed algorithm is compared to the obtained results of a system with only power-controlled rate adaptation mechanism.

/pdf/power-controlled-rate-and-coverage-adaptation-for-wcdma-16zjp9knrp.pdf

Power-Controlled Rate and Coverage Adaptation for WCDMA cellular networks

Cellular base stations are expensive to install as they require the operator to lease real estate and establish back-haul connectivity to the public network. With increasing demand for bandwidth, service providers are installing more and more relay base stations to supplement the main base station. Although relays help increase the coverage and capacity of the network, they also end up raising the net interference in the system. Decentralized relay selection algorithms that do not take interference into account, could end up under-using the capacity of the network. In this paper we propose a two-hop decentralized relay selection scheme using directional antennas that mitigates the effects of interference and performs better than the “nearest relay selection”[1] algorithm in networks with less number of relay stations. Furthermore we propose a relaying scheme where the network adaptively chooses a relay selection algorithm to use, based on the current number of relay stations in the network.

Relay selection scheme using directional antennas for cellular networks

Studies performed so far on multihop based cellular networks assume the use of omnidirectional antennas at relay stations. In this paper, we investigate the employment of advanced antenna configurations at relay stations including directional antennas and adaptive antenna arrays. We analyze several directional antenna orientation strategies and the gains achieved relative to other cellular network designs. Results show that directional antenna designs perform better than omnidirectional antenna designs for practical network loads with appropriate antenna orientation strategies. Furthermore, adaptive antenna arrays offer best results even with only two antenna elements.

WLC26-4: Fixed Relaying with Advanced Antennas for CDMA Cellular Networks

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WLC26-4: Fixed Relaying with Advanced Antennas for CDMA Cellular Networks