Patent ID: 9271310
Filing Date: 2016-02-23
CPC Classification: H04L,H04W

Claim Text:
1. A method of operating an apparatus in a wireless communications network, comprising: creating a database comprising a plurality of resource indexes and corresponding preamble signature sequences and probabilities of being usable, the resource indexes initially marked as usable and corresponding to a plurality of uplink transport channel resources; selecting a first index of the resource indexes; selecting a first preamble signature sequence of the preamble signature sequences corresponding to the first index; initiating a random access channel (RACH) procedure by transmitting a preamble utilizing the first preamble signature sequence; marking the first index with a lower probability of being usable for a subsequent RACH procedure in connection with receiving a negative acknowledgement for the preamble; selecting a second index of the resource indexes having a probability higher than that of the first index; if no acknowledgement is received from the wireless communications network for the preamble, marking the first index as unusable in the database: selecting a second preamble signature sequence of the preamble signature sequences corresponding to the second index; and transmitting a preamble utilizing the second preamble signature sequence.