Capacity of intelligent underlay and overlay network

Ling, Yu-Lun; Elling, Jan; Toftegaard, Thomas Skjødeberg

doi:10.1049/ic:19961234

Cited by 8 publications

(4 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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“…Erlang B formula is applied for estimating the capacity of normal cell for a given GoS. The blocking probability for IUO is estimated according to equations derived in [10]. Super frequencies per cell are assumed with minimum three frequencies (in order to allow frequency hopping) to maximum six frequencies (to avoid potential deadlock conditions).…”

Section: B Varying Speed and Ratio Of Moving Vehiclesmentioning

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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“…[5] presented the DCA (dynamic Channel Assignment) with a greedy algorithm, and investigated 1 dimensional cellular radio system. Simulation results were reported on IUO in [8,9,6]. In [10], the performance of GSM network implementing IUO in combination with Frequency hopping was studied by simulation.…”

Section: Introductionmentioning

confidence: 99%