Abstract:

In multi-stage preamble (MSPA) transmission based random access (RA), the base station may fail to combine every individually detected preamble to a legitimate MSPA selected by an active device. This phenomenon is called the preamble detection ambiguity of MSPA transmission based RA. In this paper, we propose a one-coincidence sequence aided MSPA construction method. The proposed method which effectively extends the RA resource pool and eliminates the MSPA detection ambiguity. Furthermore, a tag is further incorporated into our RA strategy to facilitate active MSPA detection. Simulation results show that compared with the traditional single-stage PA transmission based RA strategy, our tagged MSPA RA strategy achieves a better RA performancein terms of the probability of PA collision and access success probability.

Key words: random access, multi-stage preamble transmission, one-coincidence sequence