Capacity of CDMA/TDD System Supporting Voice and Multimedia Data Applications
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Abstract
The intergrated voice and data CDMA/TDD with asymmetrc capacity allocation between uplink and downlink is a highly attractive solution to support the next generation mobile multimedia systems with the asymmetric traffic volume in uplink and downlink. This is because flexbile asymmetric allocation problem in CDMA/TDD is usually defined as decomposing a frame into uplink and downlink timeslots, respectively, i.e., timeslot allocation problem to each of up/down links for each frame. in this paper, we mathematically fomulate an optimal timeslot allocation problem considering fairness among cells and fairness among types of calls for the integrated voice and data CDMA/TDD system as a nonlinear integer programming problem, which is to maximize the system capacity under the given asymmetric traffic volume in up and down links. Extensive experimental results show that the system capacity of the CDMA/TDD system capacity of the CDMA/TDD system using a symmetrc timeslot allocation scheme, and increasing the degree of fairness slightly decreases the system capacity.
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