Patent ID: 8913563
Filing Date: 2014-12-16
Classification: H04W

Abstract:
1. A communications method comprising: establishing an access slot group corresponding to a velocity range of one or more mobile units relative to a network element; establishing a slot sequence for the access slot group, wherein the slot sequence is weighted based on a frequency of use of the one or more mobile units; transmitting the access slot group information to one or more mobile units, wherein the access slot group information indicates a start time for an access slot and the slot sequence; receiving a signal at the network element from at least one of the one or more mobile units in the access slot of the access slot group at the indicated start time for the access slot, wherein the signal includes a sequence of bits, wherein the at least one of the one or more mobile units selects the access slot of the access slot group; selecting a detection algorithm corresponding to the velocity range of the at least one of the one or the one or more mobile units relative to the network element; and detecting the sequence of bits using the detection algorithm, wherein the detection algorithm performs a coherent correlation between the received signal and a predefined sequence stored in the network element.