Method for performing random access and terminal for performing same
摘要
說明書
The preamble format is configured as a value that indicates five sort of random access preamble formats described above with reference to Table 2. The preamble format may have a value of 0 to 4. The preamble format may be determined according to cell environment, network state, etc. Preamble format 0 may be used for normal environment. Preamble format 1 may be used for the case in which time retard is significant such as the cell environment of big radius. Preamble format 2 is for the case of sending sequence repeatedly in considering the situation in which signal to interference noise ratio (SINR) is low, and may be used for the case in which cell radius is within 30 km. Preamble format 3 is for the case of sending sequence repeatedly in considering the situation in which SINR is low, and may be used for the case in which cell radius is within 100 km.
The system frame number may be configured as a value for specifying a radio frame that may be used as the PRACH which is a radio resource for random access among the above described radio frames. The system frame number may be configured to indicate that any radio frames may be used for random access and/or a radio frame having a specific index such as even numbers may be used for random access.
The subframe number may be configured to indicate an index number of the subframe which may be used for random access within a radio frame. The number of subframe that can be used as the PRACH for random access within a radio frame may be one or more.
