Patent ID: 10098158

Abstract:
A wireless device, a base station, a random access method and a preamble configuration method are provided. The mobile communication system defines a plurality of preambles, a plurality of low priority preamble sets, and a high priority preamble set. The low priority preamble sets have a strict partial order relationship therebetween. The high priority preamble set and the highest-order low priority preamble set are independent from each other. When requiring random access from a base station, the wireless device randomly selects a preamble from the low priority preamble sets to transmit a random access request message to the base station by using the selected preamble. When the request for random access fails, the wireless device with low priority randomly reselects a preamble from the higher-order low priority preamble set, and the wireless device with high priority randomly reselects a preamble from the high priority preamble set.