| 摘要 |
An access node/base station is allocated one or more root sequences for use with RACH preambles in the cell. The access node broadcasts an index for one of the root sequences and a basic cyclic shift parameter. A user equipment UE receives the index and parameter, determines all of the root sequences that are allocated to the cell (directly from the index and inherently from it if more than one root is allocated), and selects a sequence from among all cyclic shifts (including zero shift) of all of the allocated root sequences. The access node is required to make available in the cell a predetermined minimum number of cyclic shifts, but by selecting its sequence from among all cyclic shifts of all allocated root sequences, the UE's selection is not limited to be from among that minimum number. The UE sends on the RACH a preamble signal with the selected sequence.
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