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 performing a random access procedure by a user equipment (UE), the method comprising:
receiving, by the UE, system information comprising a high-speed related parameter from a 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 received high-speed related parameter represents TRUE,
generating, by the UE, a first random access preamble sequence using the restricted set of cyclic shifts; andtransmitting, by the UE, the generated first random access preamble sequence to the network, and if the received high-speed related parameter represents FALSE,
generating, by the UE, a second random access preamble sequence using the unrestricted set of cyclic shifts; andtransmitting, by the UE, the generated second preamble sequence to the network.