An enhanced adaptive time slot assignment using access statistics in TD/CDMA TDD system

Author

Park, Soyoung ; Kim, Minjung ; Kim, Nak-Myeong

Author_Institution

Mobile Commun. Lab, Ehwa Women´´s Univ., Seoul, South Korea

Volume

1

fYear

2001

fDate

2001

Firstpage

511

Abstract

The TD/CDMA TDD system with unbalanced timeslot allocation between uplink and downlink is an appropriate method to distribute asymmetric traffic effectively in third generation mobile communication systems. One of the benefits of the TD/CDMA TDD system is an efficient statistical multiplexing on a large common pool of available resources, i.e., slots defined in time and code domain. However, in order to control the time varying asymmetry of traffic between uplink and downlink for the maximum throughput, a dynamic boundary movement is also required to get an optimum timeslot allocation. In this paper, a new optimal boundary movement algorithm for TDD operation is proposed, in which the downlink portion of the slots is maximized according to the intensity of access attempts by mobiles. The proposed algorithm has shown much better performance than the conventional TDD boundary movement algorithms in terms of the mean access delay of data traffic and the blocking probability of voice traffic

Keywords

cellular radio; code division multiple access; telecommunication control; telecommunication traffic; time division multiple access; time division multiplexing; CDMA; TD/CDMA TDD system; TDM; TDMA; access attempts; access statistics; asymmetric traffic; blocking probability; code domain; data traffic; downlink; dynamic boundary movement; enhanced adaptive time slot assignment; mean access delay; optimal boundary movement algorithm; optimum timeslot allocation; performance; statistical multiplexing; third generation mobile communication; throughput; time domain; time varying asymmetry; timeslot allocation; uplink; voice traffic; Communication system traffic control; Delay; Downlink; Multiaccess communication; Multimedia communication; Multimedia systems; Probability; Statistics; Telecommunication traffic; Traffic control;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd

Conference_Location

Rhodes

ISSN

1090-3038

Print_ISBN

0-7803-6728-6

Type

conf

DOI

10.1109/VETECS.2001.944895

Filename

944895