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This paper analyzes the performance of a protocol proposed to improve the performance of Joint CDMA/PRMA protocol under heavy data traffic load condition. The proposed protocol features a demand-based assignment scheme for data transmission. Its performance is evaluated using two analysis methods: a Traditional Markov Analysis and a Transient Fluid Analysis. Simulation results are also given to validate the assumptions made in the mathematical models developed. Our work shows that demand-based assignment scheme is suitable for random data traffic transmission, especially when there are a large number of active data terminals with short random messages.