Method and apparatus for enhanced contention based random access procedure

Patent metadata

Field	Value
Publication number	US-11665694-B2
Application number	US-202117171313-A
Country	US
Kind code	B2
Filing date	Feb 9, 2021
Priority date	Oct 7, 2016
Publication date	May 30, 2023
Grant date	May 30, 2023

Abstract

A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system 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. A method of a user equipment (UE) for performing a random access (RA) procedure is provided. The method includes transmitting a first message including a RA preamble and a UE identifier (ID) to a base station (BS), and receiving a second message including a sequence index of the RA preamble from the BS.

First claim

What is claimed is:

1. A method performed by a terminal for a random access (RA) procedure, the method comprising:
transmitting, to a base station, a first message for a 2-step RA procedure, the first message including an RA preamble and information;
receiving, from the base station, as a response to the first message, a second message indicating a fallback to a 4-step RA procedure, the second message including an uplink (UL) grant; and
transmitting, to the base station, a third message based on the UL grant.

2. The method of claim 1 , wherein the RA preamble and the information are time division multiplexed (TDMed).

3. The method of claim 2 , wherein the RA preamble is transmitted on a physical random access channel (PRACH), and the information is transmitted using a resource for data transmission.

4. The method of claim 1 , wherein the information includes at least one of a radio resource control (RRC) setup request, an RRC resume request, an RRC reestablishment request, or an RRC system information request.

5. The method of claim 1 , wherein the second message further includes at least one of a timing advanced (TA) command or a temporary cell-radio network temporary identifier (C-RNTI).

6. A method performed by a base station for a random access (RA) procedure, the method comprising:
receiving, from a terminal, a first message for a 2-step RA procedure, the first message including an RA preamble and information;
transmitting, to the terminal, as a response to the first message, a second message indicating a fallback to a 4-step RA procedure, the second message including an uplink (UL) grant; and
receiving, from the terminal, a third message based on the UL grant.

7. The method of claim 6 , wherein the RA preamble and the information are time division multiplexed (TDMed).

8. The method of claim 7 , wherein the RA preamble is received on a physical random access channel (PRACH), and the information is received using a resource for data transmission.

9. The method of claim 6 , wherein the information includes at least one of a radio resource control (RRC) setup request, an RRC resume request, an RRC reestablishment request, or an RRC system information request.

10. The method of claim 6 , wherein the second message further includes at least one of a timing advanced (TA) command or a temporary cell-radio network temporary identifier (C-RNTI).

11. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
transmit, to a base station via the transceiver, a first message for a 2-step random access (RA) procedure, the first message including an RA preamble and information,
receive, from the base station via the transceiver, as a response to the first message, a second message indicating a fallback to a 4-step RA procedure, the second message including an uplink (UL) grant, and
transmit, to the base station via the transceiver, a third message based on the UL grant.

12. The terminal of claim 11 , wherein the RA preamble and the information are time division multiplexed (TDMed).

13. The terminal of claim 12 , wherein the RA preamble is transmitted on a physical random access channel (PRACH), and the information is transmitted using a resource for data transmission.

14. The terminal of claim 11 , wherein the information includes at least one of a radio resource control (RRC) setup request, an RRC resume request, an RRC reestablishment request, or an RRC system information request.

15. The terminal of claim 11 , wherein the second message further includes at least one of a timing advanced (TA) command or a temporary cell-radio network temporary identifier (C-RNTI).

16. A base station in a wireless communication system, the base station comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
receive, from a terminal via the transceiver, a first message for a 2-step RA procedure, the first message including an RA preamble and information,
transmit, to the terminal via the transceiver, as a response to the first message, a second message indicating a fallback to a 4-step RA procedure, the second message including an uplink (UL) grant, and
receive, from the terminal via the transceiver, a third message based on the UL grant.

17. The base station of claim 16 , wherein the RA preamble and the information are time division multiplexed (TDMed).

18. The base station of claim 17 , wherein the RA preamble is received on a physical random access channel (PRACH), and the information is received using a resource for data transmission.

19. The base station of claim 16 , wherein the information includes at least one of a radio resource control (RRC) setup request, an RRC resume request, an RRC reestablishment request, or an RRC system information request.

20. The base station of claim 16 , wherein the second message further includes at least one of a timing advanced (TA) command or a temporary cell-radio network temporary identifier (C-RNTI).

Assignees

• Samsung Electronics Co Ltd

Inventors

• Agiwal Anil
• Chang Youngbin

Classifications

• H04W74/0836

  with 2-step access · CPC title

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/0866

  using a dedicated channel for access · CPC title

• H04W4/02

  Services making use of location information · CPC title