Modeling the sleep mode for cellular digital packet data

Cellular digital packet data (CDPD) utilizes sleep mode mechanism to conser ve the power of mobile end systems (M-ES's), A timer called T203 determines how quick an M-ES enters the sleep mode, and another timer called T204 det ermines how often the M-ES wakes up. A large T204 value and a small T203 va lue can effectively reduce the power consumption at the cost of degrading t he frame transmission performance, i.e., more lost frames, longer frame wai ting times, and larger waiting variance. When the power consumption budget is determined in a CDPD system design, our study provides guidelines to det ermine the timer values as well as the buffer size to optimize the frame tr ansmission performance.