Title :
Capacity-coverage analysis of TDD and FDD mode in UMTS at 1920 MHz
Author :
Haas, H. ; McLaughlin, S. ; Povey, G.J.R.
Author_Institution :
Dept. of Electron. & Electr. Eng., Edinburgh Univ., UK
fDate :
2/1/2002 12:00:00 AM
Abstract :
In the Universal Mobile Telephony System (UMTS) the frequency division duplex (FDD) and time division duplex (TDD) modes have adjacent carriers at 1920 MHz. This creates adjacent channel interference (ACI) between the two different air interfaces. Since different duplexing modes are used, the implications for each system are different, with respect to capacity and coverage: these implications are investigated. The separation distance of the TDD and FDD base station and the load in each system are varied and a symmetrical speech service in both systems is considered, with non-ideal power control assumed. It is found that for an FDD cell radius of 1000 m, a TDD cell radius of 50 m and 10% maximal tolerable outage, the effects of ACI on capacity can be compensated by dynamically increasing the required power at each BS, without affecting the coverage
Keywords :
adjacent channel interference; cellular radio; channel capacity; code division multiple access; multiuser channels; network interfaces; power control; radiotelephony; telecommunication control; voice communication; 1920 MHz; 25 m; 500 m; ACI; CDMA; FDD mode; TDD mode; UHF; UMTS; Universal Mobile Telephony System; adjacent channel interference; air interfaces; base station; capacity-coverage analysis; cell radius; cellular radio; code division multiple access; frequency division duplexing; nonideal power control; outage; separation distance; symmetrical speech service; system load; time division duplexing;
Journal_Title :
Communications, IEE Proceedings-
DOI :
10.1049/ip-com:20020109
