RANDOM ACCESS METHOD AND TERMINAL DEVICE

• US 20200137802A1
• Filed: 07/20/2017
• Published: 04/30/2020
• Est. Priority Date: 07/20/2017
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: TANG, Hai
• Granted Patent: US 11,202,322 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Disclosed in embodiments of the present disclosure are a random access method and terminal device. The method includes: transmitting, by a terminal device, a plurality of preambles to a network device in one random access procedure; and monitoring, by the terminal device, a Random Access Response (RAR) to at least one preamble in the plurality of preambles in at least one RAR window.

Claims

1. A random access method, comprising:

transmitting, by a terminal device, a plurality of preambles to a network device in one random access procedure; and

monitoring, by the terminal device, a Random Access Response (RAR) to at least one preamble in the plurality of preambles in at least one RAR window.

2. The method according to claim 1, wherein the at least one RAR window comprises one RAR window, and a starting position of the one RAR window in a time domain is located after transmission of the plurality of preambles;

wherein the monitoring, by the terminal device, the RAR to at least one preamble in the plurality of preambles in at least one RAR window, comprises;

monitoring, by the terminal device, RARs to at least two preambles in the plurality of preambles in the one RAR window.

3. The method according to claim 1, wherein the at least one RAR window comprises one RAR window, and a starting position of the one RAR window in a time domain is located after transmission of a first preamble in the plurality of preambles and before transmission of a second preamble in the plurality of preambles;

wherein the monitoring, by the terminal device, the RAR to at least one preamble in the plurality of preambles in at least one RAR window, comprises;

monitoring, by the terminal device, RARs to at least two preambles in the plurality of preambles in the one RAR window.

4. The method according to claim 1, wherein the at least one RAR window comprises a plurality of RAR windows corresponding to the plurality of preambles one to one, and a starting position of each of the plurality of RAR windows in a time domain is located after transmission of a corresponding preamble;

wherein the monitoring, by the terminal device, the RAR to at least one preamble in the plurality of preambles in at least one RAR window, comprises;

monitoring, by the terminal device, the RAR to the corresponding preamble in each RAR window.

5. The method according to claim 4, wherein a starting position of a first RAR window in the plurality of RAR windows in a time domain is located in a Kth sub-frame after transmission of a preamble corresponding to the first RAR window, wherein K is an integer smaller than 3.

6. The method according to claim 1, wherein the transmitting, by the terminal device, a plurality of preambles to the network device in one random access procedure, comprises:

transmitting, by the terminal device, the plurality of preambles to the network device through at least one Physical Random Access Channel (PRACH) resource in the one random access procedure.

7. The method according to claim 6, wherein the transmitting, by the terminal device, the plurality of preambles to the network device through at least one PRACH resource in the one random access procedure, comprises:

transmitting, by the terminal device, the plurality of preambles to the network device through a plurality of PRACH resources corresponding to the plurality of preambles one to one in the one random access procedure.

8. The method according to claim 1, wherein after the terminal device monitors the RAR to a first preamble in the plurality of preambles in the at least one RAR window, the method further comprises:

transmitting, by the terminal device, a third message in the random access procedure to the network device according to an uplink grant carried in the RAR to the first preamble.

9. The method according to claim 8, wherein the RAR to the first preamble is a RAR that the terminal device first monitors in the at least one RAR window.

10. The method according to claim 1, wherein the random access procedure is a contention based random access procedure, or a non-contention based random access procedure, or a random access procedure for obtaining system information.

11. A terminal device, comprising:

a processor;

a memory storing instructions executable by the processor;

wherein the processor is configured to;

transmit a plurality of preambles to a network device in one random access procedure; and

monitor a Random Access Response (RAR) to at least one preamble in the plurality of preambles in at least one RAR window.

12. The terminal device according to claim 11, wherein the at least one RAR window comprises one RAR window, and a starting position of the one RAR window in a time domain is located after transmission of the plurality of preambles;

wherein the processor is configured to;

monitor RARs to at least two preambles in the plurality of preambles in the one RAR window.

13. The terminal device according to claim 11, wherein the at least one RAR window comprises one RAR window, and a starting position of the one RAR window in a time domain is located after transmission of a first preamble in the plurality of preambles and before transmission of a second preamble in the plurality of preambles;

wherein the processor is configured to;

monitor RARs to at least two preambles in the plurality of preambles in the one RAR window.

14. The terminal device according to claim 11, wherein the at least one RAR window comprises a plurality of RAR windows corresponding to the plurality of preambles one to one, and a starting position of each of the plurality of RAR windows in a time domain is located after transmission of a corresponding preamble;

wherein the processor is configured to;

monitor a RAR to the corresponding preamble in each RAR window.

15. The terminal device according to claim 11, wherein a starting position of a first RAR window in the plurality of RAR windows in a time domain is located in a Kth sub-frame after transmission of a preamble corresponding to the first RAR window, wherein K is an integer and is less than 3.

16. The terminal device according to claim 11, wherein the processor is configured to:

transmit the plurality of preambles to the network device through at least one Physical Random Access Channel (PRACH) resource in the one random access procedure.

17. The terminal device according to claim 16, wherein the processor is configured to:

transmit the plurality of preambles to the network device through a plurality of PRACH resources corresponding to the plurality of preambles one to one in the one random access procedure.

18. The terminal device according to claim 11, wherein the processor is further configured to:

transmit a third message in the random access procedure to the network device according to an uplink grant carried in a RAR to a first preamble after the monitoring unit monitors the RAR to the first preamble in the plurality of preambles in the at least one RAR window;

wherein the RAR to the first preamble is a RAR that the terminal device first monitors in the at least one RAR window.

20. The terminal device according to claim 11, wherein the random access procedure is a contention based random access procedure, or a non-contention based random access procedure, or a random access procedure for obtaining system information.

19. (canceled)

21. A non-transitory computer storage medium for storing computer software instructions configured to perform a random access method, wherein the method comprises:

transmitting a plurality of preambles to a network device in one random access procedure; and

monitoring a Random Access Response (RAR) to at least one preamble in the plurality of preambles in at least one RAR window.