Research and Analysis of TD-SCDMA Uplink Capacity - Advanced Research on Computer Education, Simulation and Modeling - page 128

Research and Analysis of TD-SCDMA Uplink Capacity *
Hao Chen 1,2 , Tong Yang 3 , Jian-fu Teng 1 , and Hong He 4
1 School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China
2 Computer Science and Information Engineering College
Tianjin University of Science & Technology, Tianjin, 300222
3 Tianjin Mobile Communications Co., Ltd., Tianjin 300052, China
4 Tianjin Key Laboratory for Control Theory and Application in Complicated Systems,
Tianjin University of Technology, Tianjin 300384, China
[e-mail]
Abstract. In 3 th G system network planning, the cell capacity calculation is a
very important and critical issue. Assumed under the single-service of TD-
SCDMA, this paper investigated the uplink cell capacities of the TD-SCDMA
system and analyzed the relations between the user numbers and the required
signal-to-noise ratios(SNR). Focusing the issue, firstly, we determined some
several uplink cell parameters of TD-SCDMA cellular network based on the
3GPP specifications, such as SNR, processing gain, etc. Secondly, the equation
of the uplink performance of TD-SCDMA was derived from two cases of a
single cell and multiple-cell. It will provide a strong theoretical support for the
future TD-SCDMA network planning and optimization.
Keywords: uplink capacity; processing gain; active factor.
1 Introduction
The third generation mobile communication system has started to comprehensively
plan and commercially operate [1][2]. The 3 th G consists of two modes, a frequency
division duplex (FDD) mode [3] and a time-division duplex(TDD) mode [4]. TDD
mode has two options, one is wideband TDD (WB-TDD) with chip rate of 3.84 Mcps
and the other is low-chip rate TDD (LCR-TDD) with that of 1.28 Mcps. LCR-TDD is
also called as TD-SCDMA (Time Division Synchronous CDMA) System. Most of
the existing researches on capacity of cellular system are for FDD-CDMA systems.
The single-cell and multi-cell uplink and downlink capacity formula has been derived
.So far research on TD-SCDMA system capacity is little and limited to be derived.
This paper is mainly to solve this problem, and it deduces the limit theory load
capacity under the single-cell and multiple-cell conditions. In general, capacity
analysis method has two kinds: One analysis method is from traffic statistical; another
is derived from the view of interference. The paper chooses the latter. It mainly study
* The title selection is mainly originated from Tianjin science and technology innovation
special funds project(10FDZDGX00400) “the research and development, demonstration and
application of new generation mobile communication network coverage key technology”.