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Large scale parameters (LSP) mainly describe the distribution of the transmitted power over different dimensions of the channel. The required statistic is obtained from MIMO channel measurements with an appropriate post processing procedure. In this contribution, we perform the characterization of large scale parameters within an urban macro cell scenario. We focus on investigating the influence of...
This article advocates a novel network architecture and associated location-based reconfiguration algorithm for the future wireless communications network. In contrast to the dominating cellular architecture, the new form envisions a logical overlapped framework with traditional cellular communication, centrally controlled short-range communication and "Store-Carry-Forward" short-range communication...
This paper presents positioning algorithms for cellular network-based mobile tracking in severe non-line-of-sight (NLOS) propagation scenarios. The aim of the algorithms is to enhance positional accuracy of network-based positioning systems when the GPS receiver does not perform well due to the hostile environment. Two positioning methods with NLOS mitigation are proposed. Constrained optimization...
As the interests of broadcasting services in mobile networks are increased, the research of convergence services of broadcasting and communication has become popular. To support broadcasting services in cellular network smoothly, WiBro support the multicast and broadcast service (MBS). MBS is transmission method that base stations belong to same MBS zone transmit the data to all users who request...
Future cellular mobile radio networks will exhibit a much more dense base station deployment than 2nd or 3rd generation communications systems, particularly with regard to traffic coverage. Hence, a significant increase in power consumption of cellular networks can be expected. In order to counter this trend, energy efficiency of such networks should be increased considerably. Concerning energy efficiency,...
Although recent studies have shown the potential benefits of base station (BS) cooperation technology, existing schemes rely on the assumptions of (i) perfect backbone links between the central network controller (CNC) and the base stations (BSs), and (ii) mobile stations (MSs) at the cell edges. The contribution of this paper is twofold. The authors first relax the aforementioned assumptions and...
Since the natural resources of electromagnetic spectrum are strictly administrated, the channel assignment problem (CAP) has been an important issue for cellular mobile network. CAP is a well-known NP-hard problem, which is to minimize the maximum of channel utilization, while guaranteeing the voice quality. In this paper, we model CAP as a Distributed Constraint Satisfaction Problem (DCSP) with fully...
This paper present the comparison of base station antenna operating at 900 MHz GSM network with 65° and 105° horizontal beamwidth. The base station antenna has a voltage standing wave ratio (VSWR) below 1.4, dual polarized, gain of around 16dB. Dipole antenna has been chosen due to its simplicity in antenna design and has been fabricated using brass. The dipole antennas are slanted to either +45°...
In a mobile cellular network, both new originating calls and handoff calls can be dropped at any time in the midst of a conversation when a user enters in a dead spot. Because of this, there is always some discrepancy between traffic originated by the mobile station (MS) and that of received by the base station (BS). A probability model is used in this paper to evaluate this discrepancy considering...
Efforts to increase the energy efficiency of information and communication systems in general and cellular mobile radio networks in particular has recently gained momentum. Besides positive environmental effects, lowering the energy consumption of mobile radio systems appears beneficial from an economical perspective. In this regard, the deployment of small, low power base stations, alongside conventional...
In this paper we address the issue of store-carry and forward (SCF) relaying within a cell in a mobile network. The proposed scheme can be considered as a generalization of various multihop wireless relaying schemes, where storing and carrying an information message by a mobile relay node is not allowed. The key motivation of utilizing SCF relaying within the cell is that energy consumption levels...
In the strive for lessening of the environmental impact of the information and communication industry, energy consumption of communication networks has recently received increased attention. Although cellular networks account for a rather small share of energy use, lowering their energy consumption appears beneficial from an economical perspective. In this regard, the deployment of small, low power...
This paper examines the effect of relay-assisted soft handover on the performance of the uplink communication in the third generation mobile networks. We focus on users which are traveling over two cell boundaries in a cellular infrastructure and operating over the same frequency band. We consider a scheme in which the relay is requested to cooperate only if the mobile source fails in its soft handover...
It is known that next generation mobile communications systems will most likely employ multi-cell signal processing - often referred to as network MIMO - in order to improve spectral efficiency and fairness. Many publications exist that predict strong achievable rate improvements, but usually neglecting various practical issues connected to network MIMO. In this paper, we analyse the impact of a constrained...
Mobile network operators often use handover statistics to improve the structure of their networks. However, such statistics only reflect the movement of connected users. In this paper, a thorough investigation of the correlation between idle and connected user mobility statistics is performed based on measurements from a live GSM network. A multiple regression model is proposed to estimate the number...
Recent developments in mobile networks have looked at placing more autonomy and intelligence at base stations to encourage cooperation between them using a distributed approach in order to try and develop a network more robust to attacks and failures. A real time fully distributed algorithm that would allow base stations in cellular networks to autonomously and cooperatively find the wireless coverage...
OFDMA-based IEEE802.16 implements among other features adaptive modulation and coding (AMC) which results in a different bit rate for each user depending on its position in the cell as well as the radio condition it experiences; users away from the base station experience lower throughput. In case of (intra-cell) mobility, the download time for the data user will thus depend on the different locations...
In the present work we study different coverage strategies for the deployment of mobile radio system in urban areas, with a particular attention to environmental aspects. The case study is a real urban deployment, in the city centre of Bologna. Both macrocellular and microcelluar coverage strategies have been analysed in order to obtain optimised coverage that guarantees a good service quality with...
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...
The design of an efficient handover technique is considered as one of the crucial topics in the cellular-based wireless networks. Feasible handover process can minimize the performance degradation as the mobile device is moving between different base stations. Based on the IEEE 802.16e standard, it is required to provide satisfactory handover performance under a wide-range of moving speeds of the...
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