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Patent No. EP3220562 (titled "Allocation Of Preamble Sequences") was filed by Nokia Solutions And Networks on Oct 2, 2007. The application was issued on May 1, 2019.
Flexible allocation of preamble sequences for random access in cellular networks like LTE. The method involves cyclically interpreting the ordered sequence set, starting from a root sequence index and including its cyclic shifts. This allows reuse of sequences beyond the initial 64, as sequences are considered consecutive even if they're actually gaps in the numbering. The ordering scheme involves dividing sequences by cubic metric, then further by high mobility cell size for the lower metric group. This allows flexible allocation of sequences with varying coverage potential.

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