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Optimal Relay Placement in Cellular Networks
Abstract : In this paper, we address the problem of optimally placing relay nodes in a cellular network with the aim of maximizing cell capacity. In order to accurately model interference, we use a dynamic framework, in which users arrive at random time instants and locations, download a file and leave the system. A fixed point equation is solved to account for the interactions between stations. We also propose an extension of a fluid model to relay based cellular networks. This allows us to obtain quick approximations of the Signal to Interference plus Noise Ratio (SINR) that are very close to 3GPP LTE-A guideline results in terms of SINR distribution.We then use these formulas to develop a dedicated Simulated Annealing (SA) algorithm, which adapts dynamically the temperature to energy variations and uses a combination of coarse and fine grids to accelerate the search for an optimized solution. Simulations results are provided for both in-band and out-of-band relays. They show how relays should be placed in a cell in order to increase the capacity in case of uniform and non-uniform traffic. The crucial impact of the backhaul link is analyzed for in-band relays. Insights are given on the influence of shadowing.
Cited literature [42 references]
https://hal-imt.archives-ouvertes.fr/hal-00958679
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Submitted on : Thursday, March 13, 2014 - 1:09:31 PM
Last modification on : Tuesday, October 19, 2021 - 11:16:02 AM
Long-term archiving on: : Friday, June 13, 2014 - 11:05:25 AM
Contributor : Admin Télécom Paristech Connect in order to contact the contributor
Submitted on : Thursday, March 13, 2014 - 1:09:31 PM
Last modification on : Tuesday, October 19, 2021 - 11:16:02 AM
Long-term archiving on: : Friday, June 13, 2014 - 11:05:25 AM
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