SIGNALING OF RANDOM ACCESS PREAMBLE SEQUENCES IN WIRELESS NETWORKS

摘要

Transmission of random access preamble structures within a cellular wireless network is based on the use of cyclic shifted constant amplitude zero autocorrelation (“CAZAC”) sequences to generate the random access preamble signal. A pre-defined set of sequences is arranged in a specific order. Within the predefined set of sequences is an ordered group of sequences that is a proper subset of the pre-defined set of sequences. Within a given cell, up to 64 sequences may need to be signaled. In order to minimize the associated overhead due to signaling multiple sequences, only one logical index is transmitted by a base station serving the cell and a user equipment within the cell derives the subsequent indexes according to the pre-defined ordering. Each sequence has a unique logical index. The ordering of sequences is identified by the logical indexes of the sequences, with each logical index uniquely mapped to a generating index. When a UE needs to transmit, it produces a second sequence using the received indication of the logical index of the first sequence and an auxiliary parameter and then produces a transmission signal by modulating the second sequence.

主权项

1. Method for communicating, comprising:
receiving at a user equipment an indication of a logical index for a first sequence, wherein the first sequence belongs to a pre-defined set of sequences; receiving at the user equipment an indication of an auxiliary parameter; producing a second sequence using the received indication of the logical index of the first sequence and using the auxiliary parameter, wherein the second sequence is selected from an ordered group of sequences, and wherein the ordered group of sequences is a proper subset of the pre-defined set of sequences; and producing a transmission signal by modulating the second sequence.