Resource Allocations for TDD OFDMA Cellular Systems Considering Traffic Asymmetries

Seungyoung PARK
Yeonwoo LEE
Sangboh YUN

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.12    pp.3691-3694
Publication Date: 2007/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.12.3691
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
radio resource allocation,  time division duplex,  TDD,  orthogonal frequency division multiple access,  OFDMA,  traffic asymmetry,  sectorization,  

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The time division duplex cellular system can support various downlink and uplink traffic ratios by setting the downlink and uplink transmission periods appropriately. However, it causes severe co-channel interference problem when some cells are active in the downlink while the others are in the uplink [2]. To mitigate this problem, a resource allocation scheme combined with sectorization is proposed for orthogonal frequency division multiple access. Simulations demonstrate that the proposed scheme improves both spectral efficiency and outage performance compared to the conventional allocation schemes.