| 摘要 |
A communications system includes a base station; and a mobile communications terminal, where the base station and the mobile communications terminal execute a random access procedure, and perform radio communication. The base station is configured to assign to the mobile communications terminal, in the random access procedure, an identifier that corresponds to preamble information, the base station assigning the identifier based on first correspondence information that indicates a given correspondence relation of the preamble information to be transmitted by the mobile communications terminal and the identifier assigned to mobile communications terminal. The mobile communications terminal is configured to execute the random access procedure with the base station by transmitting to the base station, the preamble information that corresponds to the identifier assigned by the base station. |
| 主权项 |
1. A communications system comprising:
a base station; and a mobile communications terminal, wherein
the base station and the mobile communications terminal execute a random access procedure, and perform radio communication,the base station is configured to assign to the mobile communications terminal, in the random access procedure, an identifier that corresponds to preamble information, the base station assigning the identifier based on first correspondence information that indicates a given correspondence relation of the preamble information to be transmitted by the mobile communications terminal and the identifier assigned to mobile communications terminal,the mobile communications terminal is configured to execute the random access procedure with the base station by transmitting to the base station, the preamble information that corresponds to the identifier assigned by the base station,the mobile communications terminal transmits based on second correspondence information that indicates the given correspondence relation, the preamble information that corresponds to the identifier assigned by the base station,the first correspondence information and the second correspondence information indicate a given correspondence relation of propagation quality of the radio communication between mobile communications terminal and the base station, the identifier, and the preamble information,the mobile communications terminal selects the preamble information that corresponds to a combination of the identifier assigned by the base station and the propagation quality, andthe base station determines for each propagation quality, the preamble information that the mobile communications terminal is to be caused to select, derives an identifier satisfying the given correspondence relation in each determined combination of a propagation quality and preamble information, and assigns the derived identifier to the mobile communications terminal. |
