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An adaptive hot-spot operating scheme for OFDMA downlink systems in vertically overlaid cellular architecture

Title
An adaptive hot-spot operating scheme for OFDMA downlink systems in vertically overlaid cellular architecture
Authors
Kim N.-M.Choi H.-S.Chung H.-J.
Ewha Authors
김낙명
SCOPUS Author ID
김낙명scopus
Issue Date
2006
Journal Title
ETRI Journal
ISSN
1225-6463JCR Link
Citation
vol. 28, no. 3, pp. 282 - 290
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
In vertically overlaid cellular systems, a temporary traffic concentration can occur in a hot-spot area, and this adversely affects overall system capacity. In this paper, we develop an adaptive hot-spot operating scheme (AHOS) to mitigate the negative effects from the nonuniform distribution of user location and the variation in the mixture of QoS requirements in orthogonal frequency division multiple access downlink systems. Here, the base station in a macrocell can control the operation of picocells within the cell, and turns them on or off according to the system overload estimation function. In order to determine whether the set of picocells is turned on or off, we define an AHOS gain index that describes the number of subcarriers saved to the macrocell by turning a specific picocell on. For initiating the picocell OFF procedure, we utilize the changes in traffic concentration and co-channel interference to the neighboring cells. According to computer simulation, the AHOS has been proved to have maximize system throughput while maintaining a very low QoS outage probability under various system scenarios in both a single-cell and multi-cell environments.
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엘텍공과대학 > 전자공학과 > Journal papers
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