Capacity of CDMA Systems Supporting Heterogeneous Traffic with Binomial Random ON/OFF Activity

Jeongrok YANG  Insoo KOO  Yeongyoon CHOI  Kiseon KIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E86-B   No.7   pp.2087-2093
Publication Date: 2003/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
Keyword: 
CDMA,  QoS,  capacity,  on/off activity,  

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Summary: 
In this paper, the capacity is analyzed for a CDMA system supporting heterogeneous traffic with on/off activity. The capacity is analyzed by modeling the on/off traffic activity as a binomial random variable and compared to the conventional analysis with the simplified traffic activity factor which is a constant. It has been shown that the capacity with the conventional analysis is more optimistic than the capacity analyzed with the binomial modeling of traffic activity. The effect of traffic activity on the capacity is further investigated for two different cases. One is the case under the same transmission rate where the average rate changes according to the traffic activity. The other is the case under the same average rate where the transmission rate changes according to the traffic activity. As the traffic activity factor becomes larger, the capacity increases for the case under the same average rate, whereas it decreases for the case under the same transmission rate.