Method for transmitting and receiving physical random access channel and apparatus therefor
Disclosed herein is a method for transmitting a physical random access channel (PRACH) by a user equipment (UE) in a wireless communication system. In particular, the method includes receiving information related to PRACH resource allocation within a specific duration, and transmitting the PRACH on a PRACH occasion allocated to one or more slots based on the information, wherein the one or more slots include a last slot in the specific duration.
1. A method performed by a user equipment (UE) operating in a wireless communication system, the method comprising:
receiving information related to physical random access channel (PRACH) resource allocation comprising a period related to PRACH configuration; and
transmitting, based on the information, the PRACH in a PRACH occasion among at least one PRACH occasion allocated in a PRACH slot,
wherein the period is configured as a plurality of subframes,
wherein the PRACH slot is included in a last subframe among the plurality of subframes,
wherein the at least one PRACH occasion is started from a starting orthogonal frequency division multiplexing (OFDM) symbol included in a second half of the PRACH slot, and
wherein the starting OFDM symbol and a preamble format of the PRACH satisfy a preconfigured corresponding relation.
2. The method of claim 1 , wherein the PRACH slot is a last slot within the last subframe.
3. The method of claim 1 , wherein a subframe located immediately before the last subframe comprises a PRACH slot.
4. The method of claim 1 , wherein two subframes located at a beginning of the plurality of subframes do not include a PRACH slot.
5. An apparatus configured to operate in a wireless communication system, the apparatus comprising:
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
receiving information related to physical random access channel (PRACH) resource allocation comprising a period related to PRACH configuration; and
transmitting, based on the information, the PRACH in a PRACH occasion among at least one PRACH occasion allocated in a PRACH slot,
wherein the period is configured as a plurality of subframes,
wherein the PRACH slot is included in a last subframe among the plurality of subframes,
wherein the at least one PRACH occasion is started from a starting orthogonal frequency division multiplexing (OFDM) symbol included in a second half of the PRACH slot, and
wherein the starting OFDM symbol and a preamble format of the PRACH satisfy a preconfigured corresponding relation.
6. The apparatus of claim 5 , wherein the PRACH slot is a last slot within the last subframe.
7. The apparatus of claim 5 , wherein a subframe located immediately before the last subframe includes a PRACH slot.
8. The apparatus of claim 5 , wherein two subframes located at a beginning of the plurality of subframes do not include a PRACH slot.
9. A method performed by a base station operating in a wireless communication system, the method comprising:
transmitting information related to physical random access channel (PRACH) resource allocation comprising a period related to PRACH configuration; and
in response to the information, receiving the PRACH in a PRACH occasion among at least one PRACH occasion allocated in a PRACH slot,
wherein the period is configured as a plurality of subframes,
wherein the PRACH slot is included in a last subframe among the plurality of subframes,
wherein the at least one PRACH occasion is started from a starting orthogonal frequency division multiplexing (OFDM) symbol included in a second half of the PRACH slot, and
wherein the starting OFDM symbol and a preamble format of the PRACH satisfy a preconfigured corresponding relation.
10. The method of claim 9 , wherein the PRACH slot is a last slot within the last subframe.
11. The method of claim 9 , wherein a subframe located immediately before the last subframe includes a PRACH slot.
12. The method of claim 9 , wherein two subframes located at a beginning of the plurality of subframes do not include a PRACH slot.
13. The method of claim 1 , wherein the starting OFDM symbol is obtained based on a preconfigured PRACH configuration table and the information related to the PRACH resource allocation.