IP Library › Granted Patent US 11,343,848

Granted Patent B2

US 11,343,848 · App. 16/993,126 · Granted May 24, 2022

Method and apparatus for determining preambles and RACH occasions for 2 step random access

Inventors: Anil Agiwal (Suwon-si, KR); Jaehyuk Jang (Suwon-si, KR); Soenghun Kim (Suwon-si, KR)

Assignee: Samsung Electronics Co., Ltd.

H04W74/008 H04W56/001 H04W74/0833

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Quick Facts

Patent No.: US 11,343,848
App. No.: 16/993,126
Granted: May 24, 2022
Kind: B2

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Abstract

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides method and apparatus of determining preamble and RACH occasions for 2-step random access.

Claims (64)

1. A method performed by a terminal in a wireless communication system, the method comprising:

receiving, from a base station, a message including a first physical random access channel (PRACH) configuration index for a 4-step random access;

in case that the message does not include a second PRACH configuration index for a 2-step random access, identifying a random access preamble for the 2-step random access based on a number N of synchronization signal blocks (SSBs) per PRACH occasion for the 4-step random access and a number of contention based preambles per SSB for the 2-step random access;

identifying a PRACH occasion for the 2-step random access based on the first PRACH configuration index for the 4-step random access; and

transmitting, to a base station, a message A (MSG A) including the random access preamble using the PRACH occasion,

wherein, in case that the number N of SSBs per PRACH occasion for the 4-step random access is smaller than 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index R, the R being a number of contention based preambles per SSB for the 4-step random access, and

wherein, in case that the number N of SSBs per PRACH occasion for the 4-step random access is larger than or equal to 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index n·N preamble total /N+R, the n being an SSB index, and theN preamble total being a total number of preambles for the 4-step random access.

2. The method of claim 1 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

the random access preamble for the 2-step random access is identified based on a number of SSBs per PRACH occasion for the 2-step random access and the number of contention based preambles per SSB for the 2-step random access, and

the PRACH occasion for the 2-step random access is identified based on the second PRACH configuration index for the 2-step random access.

3. The method of claim 2 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

in case that the number of SSBs per PRACH occasion for the 2-step random access is smaller than 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index 0, and

in case that the number of SSBs per PRACH occasion for the 2-step random access is larger than or equal to 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index n·N preamble total /N, the n being an SSB index, and the N preamble total being a total number of preambles for the 2-step random access.

4. The method of claim 1 , wherein the message includes a system information block 1 (SIB1) or a radio resource control (RRC) reconfiguration message.

5. The method of claim 4 , wherein the first PRACH configuration index and the second PRACH configuration index are for a specific uplink bandwidth part (BWP).

6. A method performed by a base station in a wireless communication system, the method comprising:

transmitting, to a terminal, a message including a first physical random access channel (PRACH) configuration index for a 4-step random access; and

receiving, from the terminal, a message A (MSG A) of a 2-step random access using a PRACH occasion, the MSG A including a random access preamble for the 2-step random access,

wherein, in case that the message does not include a second PRACH configuration index for the 2-step random access, the random access preamble for the 2-step random access is based on a number N of synchronization signal blocks (SSBs) per PRACH occasion for the 4-step random access and a number of contention based preambles per SSB for the 2-step random access,

wherein, in case that the number N of SSBs per PRACH occasion for the 4-step random access is larger than or equal to 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index n·N preamble total /N+R, the n being an SSB index, and the N preamble total being a total number of preambles for the 4-step random access, and

wherein the PRACH occasion is based the first PRACH configuration index for the 4-step random access.

7. The method of claim 6 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

the random access preamble for the 2-step random access is based on a number of SSBs per PRACH occasion for the 2-step random access and the number of contention based preambles per SSB for the 2-step random access, and

the PRACH occasion for the 2-step random access is based on the second PRACH configuration index for the 2-step random access.

8. The method of claim 7 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

9. The method of claim 6 , wherein the message includes a system information block 1 (SIB1) or a radio resource control (RRC) reconfiguration message.

10. The method of claim 9 , wherein the first PRACH configuration index and the second PRACH configuration index are for a specific uplink bandwidth part (BWP).

11. A terminal in a wireless communication system, the terminal comprising:

a transceiver configured to transmit or receive a signal; and

a controller coupled with the transceiver and configured to:

receive, from a base station, a message including a first physical random access channel (PRACH) configuration index for a 4-step random access,

in case that the message does not include a second PRACH configuration index for a 2-step random access, identify a random access preamble for the 2-step random access based on a number N of synchronization signal blocks (SSBs) per (PRACH occasion for the 4-step random access and a number of contention based preambles per SSB for the 2-step random access,

identify a PRACH occasion for the 2-step random access based on the first PRACH configuration index for the 4-step random access, and

transmit, to a base station, a message A (MSG A) including the random access preamble using the PRACH occasion,

wherein, in case that the number N of SSBs per PRACH occasion for the 4-step random access is larger than or equal to 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index n·N preamble total /N+R, the n being an SSB index, and the N preamble total being a total number of preambles for the 4-step random access.

12. The terminal of claim 11 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

the PRACH occasion for the 2-step random access is identified based on the second PRACH configuration index for the 2-step random access.

13. The terminal of claim 12 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

14. The terminal of claim 11 , wherein the message includes a system information block 1 (SIB1) or a radio resource control (RRC) reconfiguration message.

15. The terminal of claim 14 , wherein the first PRACH configuration index and the second PRACH configuration index are for a specific uplink bandwidth part (BWP).

16. A base station in a wireless communication system, the base station comprising:

a transceiver configured to transmit or receive a signal; and

a controller coupled with the transceiver and configured to:

transmit, to a terminal, a message including a first physical random access channel (PRACH) configuration index for a 4-step random access, and

receive, from the terminal, a message A (MSG A) of a 2-step random access using a PRACH occasion, the MSG A including a random access preamble for the 2-step random access,

wherein, in case that the number N of SSBs per PRACH occasion for the 4-step random access is larger than or equal to 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index n·N preamble total /N+R, the n being an SSB index, and the N preamble total being a total number of preambles for the 4-step random access, and

wherein the PRACH occasion is based the first PRACH configuration index for the 4-step random access.

17. The base station of claim 16 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

the PRACH occasion for the 2-step random access is based on the second PRACH configuration index for the 2-step random access.

18. The base station of claim 16 , wherein the message includes a system information block 1 (SIB1) or a radio resource control (RRC) reconfiguration message.

19. The base station of claim 18 , wherein the first PRACH configuration index and the second PRACH configuration index are for a specific uplink bandwidth part (BWP).

20. The base station of claim 17 , wherein, in case that the message includes the second PRACH configuration index for the 2-step random access:

in case that the number of SSBs per PRACH occasion for the 2-step random access is larger than or equal to 1, the number of contention based preambles per SSB for the 2-step random access start from a preamble index n·N preamble total /N, being an SSB index, and N preamble total being a total number of preambles for the 2-step random access.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 13, 2020

From: AGIWAL, ANIL; JANG, JAEHYUK; KIM, SOENGHUN

To: SAMSUNG ELECTRONICS CO., LTD.

Reel/Frame 053495/0176 →

Priority Claims (1)

KR 10-2020-0101778 · Aug 13, 2020 · national

Continuity (2)

Provisional Application 62886862 · Aug 14, 2019

Related Publication 20210051708A1 · Feb 18, 2021