Methods and procedures for high speed UE access

摘要

A terminal random access procedure is improved by allowing a mobile terminal to correctly map signature indexes onto cyclic shifted Zadoff-Chu (ZC) sequences when the deployed cells support a high-speed mobility by informing a mobile terminal whether a cell supports high-speed mobility.

主权项

1. A method of establishing a communication link between a mobile terminal and a network, the method comprising:
receiving, by the mobile terminal, a high-speed related parameter from the network, the high-speed related parameter representing either ‘TRUE’ or ‘FALSE’, wherein TRUE corresponds to a restricted set of cyclic shifts and FALSE corresponds to an unrestricted set of cyclic shifts; if the high-speed related parameter represents TRUE,
generating, by the mobile terminal, a first plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones using the restricted set of cyclic shifts; andtransmitting, by the mobile terminal, one of the generated first plurality of sequence to the network for the random access, and if the high-speed related parameter represents FALSE,
generating, by the mobile terminal, a second plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones using the unrestricted set of cyclic shifts; andtransmitting, by the mobile terminal, one of the generated second plurality of sequences to the network for the random access.