In this contribution, we study the effect of CPS Timer_CU value on the packing density of voice trunking using AAL2. Assuming ITU G.723.1 is used for voice encoding, we set up a Markov chain model to analyze the AAL2 packing process. We find that the packing density, which is directly linked to link efficiency, depends on the Timer_CU value and number of users in the system. The analysis of this contribution gives an algorithm to calculate a reference Timer_CU value to achieve desired link efficiency.

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