FIELD: communication equipment.
SUBSTANCE: invention relates to communication. Method on user device side includes: selecting a random access preamble to the users of the random access preamble set and selecting the random access channel resource from the random access channel resource set; sending, by a user device, a random access preamble using a random access channel resource; and user device receiving random access response message on first part of downlink pass band; where at least one of: a random access preamble set or a random access channel resource set corresponds to a downlink band pass first portion, and the random access channel resource includes at least one of: a time domain random access channel resource or a frequency domain random access resource.
EFFECT: technical result consists in avoidance of consumption of downlink resources.
13 cl, 17 dwg
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