Method for constructing rach preamble and method for transmitting RACH signal

Abstract

A wireless communication system is disclosed. A method for constructing a RACH preamble according to a cell radius of a base station (BS) irrespective of a guard time (GT) and a method for allocating the RACH preamble are disclosed. A method for constructing a preamble of a random access channel (RACH) includes acquiring time-length information of a predetermined cyclic prefix (CP) for each cell radius of a base station (BS), acquiring sequence time-length information of a single sequence or a repeated sequence, and constructing the preamble using the predetermined CP time-length information and the sequence time-length information, irrespective of a time length of a guard time (GT).

Description

technical field The present invention relates to a wireless communication system, and to a method for constructing a Random Access Channel (RACH) and a method for transmitting RACH signals. Background technique Hereinafter, a method for constructing a random access channel (RACH) and a method for transmitting RACH signals will be described in detail. A method for preventing inter-symbol interference (ISI) from occurring when each symbol of a subcarrier is transmitted on a multipath channel in Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Multi-Tone (DMT) is proposed, in the following A detailed description of the above method will be described. For example, a guard time (GT) longer than the maximum delay spread of the channel is inserted between consecutive symbols. In short, this guard time (GT) is called cyclic extension. The cyclic extension (CE) is classified into a cyclic prefix (CP) and a cyclic suffix (CS). A cyclic prefix (CP) copies a signal of...

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Problems solved by technology

However, the cell size may be larger than 15km as required

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