Method and apparatus for transmitting and receiving random access channel

Patent metadata

Field	Value
Publication number	US-2019274172-A1
Application number	US-201916418174-A
Country	US
Kind code	A1
Filing date	May 21, 2019
Priority date	May 3, 2017
Publication date	Sep 5, 2019
Grant date	—

Abstract

The present invention provides a method for transmitting a random access channel (RACH). Particularly, the method includes receiving PRACH configuration information including information about a slot (RACH slot) available for transmission of the RACH and information indicating a subcarrier spacing for a PRACH, and transmitting a RACH preamble in the RACH slot on the basis of the PRACH configuration information and the subcarrier spacing, wherein the length of the RACH slot depends on the subcarrier spacing.

First claim

1 . A method of transmitting a physical random access channel (PRACH) signal by a UE in a wireless communication system, the method comprising:
receiving, from a base station, configuration information for a PRACH resource in which to transmit the PRACH signal, wherein the configuration information relates to (i) a PRACH slot in which to transmit the PRACH signal, the PRACH slot comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and (ii) a starting OFDM symbol, among the plurality of OFDM symbols in the PRACH slot, for the PRACH resource in which to transmit the PRACH signal; and transmitting, to the base station, the PRACH signal starting from the starting OFDM symbol in the PRACH slot, based on the configuration information.

2 . The method according to claim 1 , wherein the configuration information relates to slot type information that indicates a symbol index for the starting OFDM symbol.

3 . The method according to claim 2 , wherein based on the slot type information indicating a slot type, the symbol index for the starting OFDM symbol is same in each of a plurality of PRACH slots.

4 . The method according to claim 1 , wherein the configuration information comprises a symbol index for the starting OFDM symbol.

5 . The method according to claim 1 , wherein the starting OFDM symbol has a symbol index of 0 or 2.

6 . The method according to claim 1 , further comprising:
receiving, from the base station, information regarding a subcarrier spacing for the PRACH signal, wherein a length of the PRACH slot is related to the subcarrier spacing.

7 . The method according to claim 6 , wherein the configuration information comprises information regarding a frame that is related to a plurality of slots for the PRACH signal, and
wherein a number of the plurality of slots related to the frame is proportional to the subcarrier spacing for the PRACH signal.

8 . The method according to claim 7 , wherein the plurality of slots for the PRACH signal are repeatedly mapped based on a periodicity that is configured by the configuration information.

9 . The method according to claim 6 , wherein the length of the PRACH slot is inversely proportional to the subcarrier spacing, based on a preamble sequence of the PRACH signal being a short sequence having a length of 139.

10 . A UE configured to transmit a physical random access channel (PRACH) signal in a wireless communication system, the UE comprising:
a transceiver; 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, from a base station through the transceiver, configuration information for a PRACH resource in which to transmit the PRACH signal, wherein the configuration information relates to (i) a PRACH slot in which to transmit the PRACH signal, the PRACH slot comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and (ii) a starting OFDM symbol, among the plurality of OFDM symbols in the PRACH slot, for the PRACH resource in which to transmit the PRACH signal; and
transmitting, to the base station through the transceiver, the PRACH signal starting from the starting OFDM symbol in the PRACH slot, based on the configuration information.

11 . The UE according to claim 10 , wherein the configuration information relates to slot type information that indicates a symbol index for the starting OFDM symbol.

12 . The UE according to claim 11 , wherein based on the slot type information indicating a slot type, the symbol index for the starting OFDM symbol is same in each of a plurality of PRACH slots.

13 . The UE according to claim 10 , wherein the configuration information comprises a symbol index for the starting OFDM symbol.

14 . The UE according to claim 10 , wherein the starting OFDM symbol has a symbol index of 0 or 2.

15 . The UE according to claim 10 , wherein the operations further comprise:
receiving, from the base station through the transceiver, information regarding a subcarrier spacing for the PRACH signal, wherein a length of the PRACH slot is related to the subcarrier spacing.

16 . The UE according to claim 15 , wherein the configuration information comprises information regarding a frame that is related to a plurality of slots for the PRACH signal, and
wherein a number of the plurality of slots related to the frame is proportional to the subcarrier spacing for the PRACH signal.

17 . The UE according to claim 16 , wherein the plurality of slots for the PRACH signal are repeatedly mapped based on a periodicity that is configured by the configuration information.

18 . The UE according to claim 15 , wherein the length of the PRACH slot is inversely proportional to the subcarrier spacing, based on a preamble sequence of the PRACH signal being a short sequence having a length of 139.

19 . A method of receiving a physical random access channel (PRACH) signal by a base station (BS) in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE), configuration information for a PRACH resource in which to transmit the PRACH signal, wherein the configuration information relates to (i) a PRACH slot in which to transmit the PRACH signal, the PRACH slot comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and (ii) a starting OFDM symbol, among the plurality of OFDM symbols in the PRACH slot, for the PRACH resource in which to transmit the PRACH signal; and receiving, from the UE, the PRACH signal starting from the starting OFDM symbol in the PRACH slot, based on the configuration information.

20 . A base station (BS) configured to receive a physical random access channel (PRACH) signal in a wireless communication system, the BS comprising:
a transceiver; 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:
transmitting, to a user equipment (UE) through the transceiver, configuration information for a PRACH resource in which to transmit the PRACH signal, wherein the configuration information relates to (i) a PRACH slot in which to transmit the PRACH signal, the PRACH slot comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and (ii) a starting OFDM symbol, among the plurality of OFDM symbols in the PRACH slot, for the PRACH resource in which to transmit the PRACH signal; and
receiving, from the UE through the transceiver, the PRACH signal starting from the starting OFDM symbol in the PRACH slot, based on the configuration information.

Assignees

• Lg Electronics Inc

Inventors

• Yoon Sukhyon
• Ko Hyunsoo
• Kim Eunsun
• Kim Kijun

Classifications

• H04W74/006 Primary

  in the downlink, i.e. towards the terminal · CPC title

• H04L5/0041

  Frequency-non-contiguous · CPC title

• H04W72/044

  based on the type of the allocated resource · CPC title

• H04W74/0866 Primary

  using a dedicated channel for access · CPC title

• H04W74/08

  Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) · CPC title