FIELD: physics, communication.
SUBSTANCE: invention is related to data transfer. Random access channel (RACH) is determined as created by "fast" random access channel (F-RACH) and "slow" random access channel (S-RACH). F-RACH and S-RACH may efficiently support user terminals in different operational conditions. F-RACH may be used by user terminals, which are registered in system and may compensate their delays in case of propagation in both ends (RTD) with the help of according change of timing of their transfer. F-RACH may be used for fast access to system. S-RACH may be used by user terminals, which may be registered or not registered in system and may be able or unable to compensate their RTD. S-RACH is more reliable and may support user terminals under different operational conditions and modes. User terminals may use F-RACH, S-RACH or both channels to obtain access to system.
EFFECT: facilitation of random access to communication resources in wireless communication systems with random access.
17 cl, 16 dwg, 6 tbl
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