Random access method and apparatus, and storage medium

Patent metadata

Field	Value
Publication number	US-12069732-B2
Application number	US-201917423474-A
Country	US
Kind code	B2
Filing date	Jan 18, 2019
Priority date	Jan 18, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A random access method and a device thereof are provided. The method includes that a base station receives a random access preamble and sends a Random Access Response (RAR) according to the random access preamble, where the RAR indicates at least two time-frequency units, and the at least two time-frequency units are time-frequency units having different time domains on an unlicensed channel. Further, the base station receives a first random access message 3 (MSG3) sent on a first time-frequency unit by a first terminal and sends a first random access message 4 (MSG4) to the first terminal, where the first time-frequency unit is any one of the at least two time-frequency units, where the first MSG3 includes a terminal identifier of the first terminal, where the first MSG4 carries a terminal identifier of the first terminal and a first Cell-Radio Network Temporary Identifier allocated to the first terminal.

First claim

What is claimed is:

1. A method for random access, comprising:
receiving, by a base station, random access preambles sent by a first terminal and a second terminal on a same time-frequency resource;
sending, by the base station according to the random access preambles, a Random Access Response (RAR) to the first terminal and the second terminal, wherein the RAR comprises resource indication information indicating at least two time-frequency units, and the at least two time-frequency units are different time-frequency units in time domain on an unlicensed channel;
receiving, by the base station, a first random access message 3 (MSG3) sent by the first terminal on a first time-frequency unit, and a second random access message 3 (MSG3) sent by the second terminal on a second time-frequency unit, wherein the first time-frequency unit is any one of the at least two time-frequency units, and the second time-frequency unit is another one of the at least two time-frequency units, the first MSG3 comprises a terminal identifier of the first terminal and the second MSG3 comprises a terminal identifier of the second terminal; and
sending, by the base station, a first random access message 4 (MSG4) to the first terminal and a second random access message 4 (MSG4) to the second terminal, wherein the first MSG4 carries the terminal identifier of the first terminal and a first Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the first terminal, the second MSG4 carries the terminal identifier of the second terminal and a second Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the second terminal;
wherein the terminal identifier of the first terminal carried in the first MSG4 received by the first terminal is compared with the terminal identifier of the first terminal carried in the first MSG3 sent by the first terminal, and the terminal identifier of the second terminal carried in the second MSG4 received by the second terminal is compared with the terminal identifier of the second terminal carried in the second MSG3 sent by the second terminal.

2. The method of claim 1 , further comprising:
in response to determining that the first time-frequency unit is parsed to obtain MSGs 3 fed back by the first terminal and the second terminal respectively for the RAR, determining that the first terminal of the first terminal and the second terminal is a terminal that is succeeded in random access.

3. The method of claim 1 , wherein receiving the first MSG3 sent by the first terminal on the first time-frequency unit comprises:
receiving the first MSG3 sent by the first terminal on the first time-frequency unit in a Listen Before Talk (LBT) manner.

4. The method of claim 1 , wherein the terminal identifier is an International Mobile Subscriber Identification Number (IMSI) of a terminal or a random number.

5. The method of claim 1 , wherein
the at least two time-frequency units are identical in frequency domain and continuous in time domain; or
the at least two time-frequency units are identical in frequency domain and discontinuous in time domain; or
the at least two time-frequency units are different in frequency domain and continuous in time domain; or
the at least two time-frequency units are different in frequency domain and discontinuous in time domain.

6. The method of claim 5 , wherein the resource indication information indicates start time-frequency positions of the at least two time-frequency units.

7. A method for random access, comprising:
sending, by each of a first terminal and a second terminal, a random access preamble to a base station on a same time-frequency resource;
receiving, by the first terminal and the second terminal, a Random Access Response (RAR) sent by the base station, wherein the RAR comprises resource indication information indicating at least two time-frequency units, and the at least two time-frequency units are different time-frequency units in time domain on an unlicensed channel;
sending, by the first terminal on a first time-frequency unit, a first random access message 3 (MSG3) to the base station, wherein the first time-frequency unit is any one of the at least two time-frequency units, and the first MSG3 comprises a terminal identifier of the first terminal;
sending, by the second terminal on a second time-frequency unit, a second random access message 3 (MSG3) to the base station, wherein the second time-frequency unit is another one of the at least two time-frequency units, and the second MSG3 comprises a terminal identifier of the second terminal;
receiving, by the first terminal, a first random access message 4 (MSG4) sent by the base station, wherein the first MSG4 carries the terminal identifier of the first terminal and a first Cell-Radio Network Temporary Identifier (C-RNTI) allocated by the base station to the first terminal;
receiving, by the second terminal, a second random access message 4 (MSG4) sent by the base station, wherein the second MSG4 carries the terminal identifier of the second terminal and a second Cell-Radio Network Temporary Identifier (C-RNTI) allocated by the base station to the second terminal; and
comparing, by the first terminal, the terminal identifier of the first terminal carried in the first MSG4 received by the first terminal with the terminal identifier of the first terminal carried in the first MSG3 sent by the first terminal;
comparing, by the first terminal, the terminal identifier of the second terminal carried in the second MSG4 received by the second terminal with the terminal identifier of the second terminal carried in the second MSG3 sent by the second terminal.

8. The method of claim 7 , wherein sending, on the first time-frequency unit, the first MSG3 to the base station comprises:
sending, on the first time-frequency unit, the first MSG3 in a Listen Before Talk (LBT) manner.

9. The method of claim 7 , wherein the terminal identifier is an International Mobile Subscriber Identification Number (IMSI) of a terminal or a random number.

10. The method of claim 7 , wherein
the at least two time-frequency units are identical in frequency domain and continuous in time domain; or
the at least two time-frequency units are identical in frequency domain and discontinuous in time domain; or
the at least two time-frequency units are different in frequency domain and continuous in time domain; or
the at least two time-frequency units are different in frequency domain and discontinuous in time domain.

11. The method of claim 10 , wherein the resource indication information indicates starting time-frequency positions of the at least two time-frequency units.

12. A device for random access, comprising:
a processor; and
a memory for storing processor-executable instructions;
wherein the processor is configured to:
receive random access preambles sent by a first terminal and a second terminal on a same time-frequency resource;
send, according to the random access preamble, a Random Access Response (RAR), wherein the RAR comprises resource indication information indicating at least two time-frequency units, and the at least two time-frequency units are different time-frequency units in time domain on an unlicensed channel;
receive a first random access message 3 (MSG3) sent by the first terminal on a first time-frequency unit and a second random access message 3 (MSG3) sent by the second terminal on a second time-frequency unit, wherein the first time-frequency unit is any one of the at least two time-frequency units, and the second time-frequency unit is another one of the at least two time-frequency units, the first MSG3 comprises a terminal identifier of the first terminal

Assignees

• Beijing Xiaomi Mobile Software Co Ltd
• Univ Beijing Posts & Telecomm

Inventors

• Hong Wei
• Zhu Yajun
• Li Junli
• Li Yong

Classifications

• H04W16/14 Primary

  Spectrum sharing arrangements {between different networks} · CPC title

• H04W74/0833 Primary

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

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W76/11

  Allocation or use of connection identifiers · CPC title

• H04W8/26

  Network addressing or numbering for mobility support · CPC title