Method for performing random access and terminal for performing same
地域：
Seoul
摘要
A disclosure of the present specification provides a method for performing random access by a terminal. The method may comprise the steps of: selecting, by the terminal, a first resource among a plurality of resources for a physical random access channel (PRACH), wherein the plurality of resources exist for each numerology, and the numerology is defined by a cycle prefix (CP) length and a subcarrier spacing; and transmitting, by the terminal, the PRACH on the first resource through a first numerology when the selected first resource is for the first numerology.
說(shuō)明書(shū)
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[0] This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2017/006613, filed on Jun. 22, 2017, which claims the benefit of U.S. Provisional Application No. 62/353,533, filed on Jun. 22, 2016, and 62/429,083, filed on Dec. 2, 2016, the contents of which are all hereby incorporated by reference herein in their entirety.
The present invention relates to wireless communication and, more specifically, to a method by which a UE performs random access using a PRACH resource through which a random access procedure suitable for the UE is performed among different PRACH resources provided by one or more cells.
3rd generation partnership project (3GPP) long term evolution (LTE) is an improved version of a universal mobile telecommunication system (UMTS) and is introduced as the 3GPP release 8. The 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in a downlink, and uses single carrier-frequency division multiple access (SC-FDMA) in an uplink. The 3GPP LTE employs multiple input multiple output (MIMO) having up to four antennas.
權(quán)利要求
What is claimed is:1. A method of performing random access by a user equipment (UE), the method comprising:selecting, by the UE, a first resource among a plurality of resources for a physical random access channel (PRACH) based on at least one of coverage set for each of the plurality of resources or latency required by the UE, wherein the plurality of resources being present per numerology, and wherein the numerology is defined based on a cyclic prefix (CP) length and a subcarrier spacing; and transmitting, by the UE, the PRACH on the first resource through a first numerology, based on that the first resource is related to the first numerology. 2. The method according to claim 1 , wherein the first resource is selected based on an earliest PRACH transmission completion time or an earliest reception of a random access response to PRACH transmission. 3. The method according to claim 1 , wherein the first resource is selected based on a resource having a large amount of contention-based preamble signatures among the plurality of resources. 4. The method according to claim 1 , further comprising:selecting, by the UE, a second resource from the plurality of resources, based on that a random access response to the PRACH is not received; and retransmitting the PRACH through a second numerology related to the second resource. 5. The method according to claim 1 , further comprising:receiving a physical downlink control channel (PDCCH) order from a base station, wherein the PDCCH order includes information about related to selection of the first resource. 6. The method according to claim 1 , further comprising:receiving a random access response to the PRACH through the first numerology, wherein the PRACH includes first configuration information related to a resource suitable for the UE, and wherein the random access response includes second configuration information related to the resource as a response to the first configuration information; and transmitting uplink data through the second numerology based on the second configuration information. 7. The method according to claim 6 , further comprising:receiving, by the UE, downlink control information (DCI) for reception of the random access response, wherein the DCI includes first DCI and second DCI, and wherein the first DCI includes information about related to generation of the uplink data, and the second DCI triggers transmission of the generated uplink data. 8. The method according to claim 6 , further comprising:receiving, by the UE, downlink control information (DCI) for reception of the random access response, wherein the DCI includes first DCI and second DCI, wherein the first DCI includes information related to whether a PRACH resource can be changed, and the second DCI includes configuration information necessary for PRACH resource change, and wherein the second DCI is not read by the UE, based on that the PRACH resource change is not approved. 9. A user equipment (UE) performing random access, the UE comprising:a transceiver; and a processor operatively coupled to the transceiver, wherein the processor is configured to: select a first resource among a plurality of resources for a physical random access channel (PRACH) based on at least one of coverage set for each of the plurality of resources or latency required by the UE, wherein the plurality of resources being present per numerology, and wherein the numerology is defined based on a cyclic prefix (CP) length and a subcarrier spacing; and control the transceiver to transmit the PRACH on the first resource through a first numerology, based on that the first resource is related to the first numerology.
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