Optimum cell boundary for uplink and downlink in CDMA systems

Citation
K. Takeo et al., Optimum cell boundary for uplink and downlink in CDMA systems, IEICE TR CO, E83B(4), 2000, pp. 865-868
Citations number
7
Language
INGLESE
art.tipo
Letter
Categorie Soggetti
Information Tecnology & Communication Systems
Journal title
IEICE TRANSACTIONS ON COMMUNICATIONS
ISSN journal
0916-8516 → ACNP
Volume
E83B
Issue
4
Year of publication
2000
Pages
865 - 868
Database
ISI
SICI code
0916-8516(200004)E83B:4<865:OCBFUA>2.0.ZU;2-J
Abstract
In order to maintain the communications quality at a target level, signal-t o-interference ratio (SIR)-based transmission power control methods have be en developed in CDMA cellular systems. These power control methods: however , do not necessarily improve system efficiency when there is a large geogra phic deviation in traffic because they only control power levels. A shift i n the cell boundary can control traffic balance between cells. In this pape r, we evaluate the optimum location of the cell boundary and the power leve ls when a mobile station adaptively selects a base station (BS) for each of uplink and downlink under non-uniform traffic. Because of the asymmetry in system structure between uplink and downlink, the optimum cell boundaries are not always coincident for both the two links: the location of the cell boundary is found to migrate according to the loss in orthogonality in the downlink.