Radio transmission device and radio transmission method

摘要

Disclosed are a radio transmission device and a radio transmission method which reduce the RACH conflict ratio and improve the RACH detection characteristic. When the device and the method are used: as the number of signature numbers allocated for UE by the network side increases, the condition for allocating a signature by UE itself is mitigated and an expectation value which is a statistic average value of the RA quantity using the signature allocated by UE for itself is decreased; and as the number of signature numbers allocated for UE by the network side decreases, the condition for allocating a signature by UE itself is limited and an expectation value of the RA quantity using the signature allocated by UE for itself is increased.

主权项

1. A mobile station for transmitting a Random Access Preamble, comprising:
a receiving section configured to receive first information from a base station, the first information including a signature identifier (ID); a judging section configured to judge whether a signature ID associated with an ID of the mobile station is included in the first information; and a transmitting section configured to transmit a Random Access Signature indicated by the signature ID included in the first information, responsive to the judging the signature ID associated with the ID of the mobile station is included in the first information, and to transmit a Random Access Signature randomly selected by the mobile station from among a plurality of signatures, responsive to the judging section judging that the signature ID associated with the ID of the mobile station is not included in the first information.