Capacity increase in cellular radio networks using existing base station sites

Wille, V.; Irons, S.; King, A.J.

doi:10.1049/ic:19961165

Cited by 3 publications

(3 citation statements)

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“…It is a form of static planning and aims at increasing the capacity by using different frequency reuse factors for certain mobile terminals. It was first introduced by Halpern in 1983 [10] under the name of reuse partitioning and re-invented in the late 1990ies as intelligent underlay-overlay [11], [12], [13], [14]. Within the activities of the WiMAX forum and 3GPP LTE standardization, it is known as Fractional Frequency Reuse (FFR) (e.g., [15]).…”

Section: B Selected Approaches From Literaturementioning

confidence: 99%

Scheduling Constraints and Interference Graph Properties for Graph-based Interference Coordination in Cellular OFDMA Networks

Necker

2009

Mobile Netw Appl

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Abstract-The currently emerging 802.16e (WiMAX) and 3GPP Long Term Evolution (LTE) cellular systems are based on Orthogonal Frequency Division Multiple Access (OFDMA). OFDMA suffers from heavy inter-cell interference if neighboring base stations use the same frequency range. One approach to solve this issue is the application of beamforming antennas in combination with interference coordination (IFCO) mechanisms between base stations. In this paper, we trace the problem of IFCO back to the graph coloring problem and investigate the achievable resource utilization of the interference coordinated system. We develop a heuristic that allows the combination of arbitrary scheduling algorithms with the IFCO mechanism. This allows an efficient utilization of the radio system's frequency resources while still obeying scheduling constraints, such as Quality of Service requirements. Finally, we study the tradeoff between fairness and the total system throughput.

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Section: B Selected Approaches From Literaturementioning

confidence: 99%

Scheduling Constraints and Interference Graph Properties for Graph-based Interference Coordination in Cellular OFDMA Networks

Necker

2009

Mobile Netw Appl

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“…In an overlay/underlay system, frequency spectrum is divided between the macrocells and microcells in such a way that a macrocell uses certain channels throughout the cellular system [27]. Also, the macrocell typically has a separate BS and a transmission tower.…”

Section: Special Architecturesmentioning

confidence: 99%

Handoff in cellular systems

1998

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andoff is a process of transferring a mobile station (MS) from one base station (BS) or channel to another. The channel change due to handoff may be through a time slot, frequency band, codeword, or combination of these for time-division multiple access (TDMA), frequency-division multiple access (FDMA), code-division multiple access (CDMA), or a hybrid scheme, respectively [1]. This article includes four major topics. Topic 1: Deployment Scenarios and Handoff-Topic 1 describes different system deployment scenarios and their constraints on the handoff procedure. Handoff algorithms with a specific set of parameters cannot perform uniformly well in different communication system deployment scenarios since these scenarios are characterized by specific environments. Examples of different system structures include macrocells, microcells, overlays, integrated cellular systems, integrated cordless and cellular systems, and integrated terrestrial and satellite systems. Note that these system structures are expected to coexist in future wireless communication systems and warrant closer study. Topic 2: Resource Management in Cellular Systems-Topic 2 views handoff and other resource management tasks and details handoff-related system performance improvement. Prioritizing handoff is one way to improve handoffrelated system performance. Several handoff prioritization schemes (e.g., guard channels and queuing) are discussed. Handoff represents one of the radio resource management tasks carried out by cellular systems. Some other resource management functions include admission control, channel assignment, and power control. If some of the resource management tasks are treated in an integral manner, better overall performance can be obtained in a global sense by making appropriate trade-offs. Topic 3: Implementation of Handoff-Topic 3 describes how handoff procedure is implemented. The decision making process of handoff may be centralized or decentralized (i.e., the handoff decision may be made at the MS, BS, or mobile switching center, MSC). Different systems use different approaches to execute the process of handoff, and handoff protocols characterize these approaches. Topic 4: Analysis of Handoff Algorithms-Three basic mechanisms have been used to evaluate the performance of handoff algorithms, and these mechanisms-the analytical approach, simulation approach, and emulation approachare described in topic 4.

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“…A comprehensive description of IUO functionality is given in [2], [6]. It has been theoretically shown in [8][9] that, how capacity gain can be obtained if Underlay-Overlay scheme is used. In [2], [11], [12] IUO was modeled and analyzed with a GSM network simulator CAPACITY.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Approach to Enhance the Capacity of GSM Frequency Hopping Networks with Intelligent Underlay-Overlay

Nasrin¹,

Rajib²

2009

JCM

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Intelligent Underlay Overlay (IUO) scheme is one of the most cost effective solution for capacity enhancement of Global System for Mobile Communication (GSM). However, the overall gain from this type of complex architecture depends on how efficiently it is designed and available radio resources are utilized. This paper proposes a step by step process to design IUO in order to optimize the gain. Here, the network configurations are determined analytically and a traffic model is developed to estimate the traffic distribution among different layers of IUO cell. Equations for frequency reuse in each layer are derived and Frequency Hopping (FH), Power Control (PC) and Discontinuous Transmission (DTX) are integrated. Effect of various parameters on cluster sizes is studied. It is found that for some cases it is better to utilize the advantages from FH rather than IUO when these features are combined. Several factors are taken into consideration during design phase like co-channel cells, super area coverage, traffic distribution, ratio and speed of moving vehicles, blocking probability intended by operator etc. Finally an IUO cell is designed which shows 41.42% capacity enhancement over normal cells having similar features and resources.

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Capacity increase in cellular radio networks using existing base station sites

Cited by 3 publications

References 0 publications

Scheduling Constraints and Interference Graph Properties for Graph-based Interference Coordination in Cellular OFDMA Networks

Scheduling Constraints and Interference Graph Properties for Graph-based Interference Coordination in Cellular OFDMA Networks

Handoff in cellular systems

An Analytical Approach to Enhance the Capacity of GSM Frequency Hopping Networks with Intelligent Underlay-Overlay

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