A Dynamic Downlink Load Control Scheme for WCDMA and HSDPA Systems

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Mutual interference among users can abruptly increase othercell interference and cause overload situation in coexisting WCDMA and HSDPA systems. Traffic overloading can degrade the performance of the systems. This letter proposes a new dynamic downlink load control (DDLC) algorithm to reduce performance degradation due to overload in the coexistence of WCDMA and HSDPA systems. With the proposed algorithm, the downlink load is controlled according to load states classified by two load-control thresholds, and traffic overloading is alleviated by dynamically adjusting the CQI values reported by users, based on the downlink load as well as channel variations. The proposed algorithm is simulated and results show that the DDLC scheme improves the performance of both WCDMA and HSDPA systems in terms of outage probability, total system throughput, and radio resource utilization.
Publisher
IEICE-Inst Electronics Information Communications Eng
Issue Date
2009-06
Language
English
Article Type
Article
Citation

IEICE TRANSACTIONS ON COMMUNICATIONS, v.E92B, no.6, pp.2327 - 2331

ISSN
0916-8516
URI
http://hdl.handle.net/10203/93515
Appears in Collection
EE-Journal Papers(저널논문)
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