Method for performing random access and terminal for performing same
摘要
說(shuō)明書(shū)
When a UE determines that a selected PRACH is not suitable therefor after reception of a random access response from an eNodeB, the UE can re-reselect a PRACH suitable therefor. According to an embodiment, the UE can select a PRACH resource suitable therefor on the basis of preset information and transmit a random access preamble corresponding to the selected PRACH resource to the eNodeB.
When a PRACH resource is configured per numerology in a system in which two or more numerologies coexist, the number of preamble signatures allocated for contention-free random access may be different for PRACH resources. Accordingly, collision probability of a UE that performs contention-based random access using each PRACH resource may vary.
A UE can select a numerology to be used for a PRACH procedure by comparing contention degrees of PRACH resources. For example, the UE can select a numerology on the basis of amounts of contention-free preamble signatures allocated to PRACH resources of numerologies. A base station (i.e., eNodeB) can broadcast information about a numerology having a PRACH resource to which a larger amount of contention-free preamble signatures have been allocated to the UE.
