Method for performing random access and terminal for performing same
摘要
說明書
<Numerology Selection According to Coverage>
If a UE is not aware of the coverage thereof and is not sensitive to latency, the UE can select numerologies from a PRACH resource of a numerology supporting the narrowest coverage to PRACH resources of numerologies supporting wider coverages.
It is assumed that a wireless communication system supports two numerologies, the first numerology uses a first subcarrier spacing and a PRACH preamble of the first numerology uses a format defined on the basis of X1 km. In addition, the second numerology uses a second subcarrier spacing and a PRACH preamble of the second numerology uses a format defined on the basis of X2 km. Here, a case in which X1 is greater than X2 is assumed.
Here, if a UE has no information about the coverage thereof and is not sensitive to latency, the UE can select the PRACH resource of the second numerology first. When the selected second numerology satisfies coverage conditions, the UE can perform a PRACH procedure by receiving a random access response, and it can be determined that the selected second numerology does not satisfy the coverage conditions when the UE does not receive the random access response. When the UE does not receive the random access response, the UE can select the PRACH resource of the first numerology in the subsequent operation.
On the other hand, if the UE is not aware of coverage conditions thereof and is sensitive to latency, the UE can select the PRACH resource of the second numerology to prevent time delay due to retransmission. When this method is used, collision probability of UEs sensitive to latency can be decreased by preferentially allocating UEs located within a specific coverage to corresponding PRACH resources.
<Numerology Selection According to Latency>
