View : 78 Download: 0
An adaptive hot-spot operating scheme for OFDMA downlink systems in vertically overlaid cellular architecture
- An adaptive hot-spot operating scheme for OFDMA downlink systems in vertically overlaid cellular architecture
- Kim N.-M.; Choi H.-S.; Chung H.-J.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- ETRI Journal
- vol. 28, no. 3, pp. 282 - 290
- SCI; SCIE; SCOPUS; KCI
- 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.
- Appears in Collections:
- 엘텍공과대학 > 전자공학과 > Journal papers
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.