# US 12,114,375 B2 · Random access method and apparatus, and user equipment and network device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,114,375 B2
- Document ID: US12114375B2
- Status: Granted
- Kind: B2
- Application number: 17/887,511
- Filed: 2022-08-15
- Published: 2022-12-08
- Granted: 2024-10-08
- Earliest claimed: 2019-04-24
- Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Inventors: Cong Shi
- Web page: https://patentgrep.com/patent/US12114375B2

## CPC

- H04W 74/085: {collision avoidance}
- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 80/02: Data link layer protocols
- H04W 74/0836: with 2-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided in the embodiments of the invention are a random access method and apparatus, and a user equipment and a network device. The method comprises: after a UE sends a first message, detecting a scheduling instruction of a second message in a first window, wherein the second message comprises at least one of the following: a first conflict resolution identifier, a second conflict resolution identifier, first indication information and second indication information; the first conflict resolution identifier is used for conflict resolution of a connected UE; the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE; the first indication information is used for indicating that a two-step random access process returns to a four-step random access process; and the second indication information is used for indicating a random backoff value when the UE retransmits the first message.

## Claims

### Claim 1

A random access method, the method comprising:
detecting a scheduling instruction of a second message in a first window after a user equipment (UE) sends a first message, wherein the first message comprises a preamble and an uplink data channel;
the second message comprising at least one of the following: a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE; the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE; the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
the second conflict resolution identifier; and
a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the MAC PDU comprises at least one of the following:
a first media access control sub-PDU, wherein the first MAC sub-PDU carries the first conflict resolution identifier, and the first conflict resolution identifier is a cell radio network temporary identifier (C-RNTI);
the second MAC sub-PDU, wherein the second MAC sub-PDU carries the second conflict resolution identifier;
the third MAC sub-PDU, wherein the third MAC sub-PDU carries the random access response (RAR).

### Claim 3 (depends on 2)

The method according to claim 2, wherein the RAR comprises uplink timing advance information, uplink scheduling information, and a temporary cell radio network temporary identifier (TC-RNTI).

### Claim 4 (depends on 2)

The method according to claim 2, wherein the type of the target MAC sub-PDU refers to the first MAC sub-PDU, the second MAC sub-PDU, or the third MAC sub-PDU.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the first sub-header further carries the random access preamble ID (RAPID).

### Claim 6

A random access method, the method comprising:
a network device receives a first message transmitted by a user equipment (UE), and transmits a scheduling instruction of a second message in a first window, wherein the first message comprises a preamble and an uplink data channel;
wherein the second message comprises at least one of the following: a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE, the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE; the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
the second conflict resolution identifier; and
a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the MAC PDU comprises at least one of the following:
a first MAC sub-PDU, wherein the first MAC sub-PDU carries the first conflict resolution identifier, and the first conflict resolution identifier is a cell radio network temporary identifier (C-RNTI);
the second MAC sub-PDU, wherein the second MAC sub-PDU carries the second conflict resolution identifier;
the third MAC sub-PDU, wherein the third MAC sub-PDU carries the random access response (RAR).

### Claim 8

A random access device, which is applied to a user equipment (UE), and the device comprising:
a transmitter, configured to transmit a first message, wherein the first message comprises a preamble and an uplink data channel;
a receiver, configured to detect a scheduling instruction of a second message in a first window;
wherein the second message comprises at least one of the following: a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE; the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE; the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
the second conflict resolution identifier; and
a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.

### Claim 9 (depends on 8)

The random access device according to claim 8, wherein the MAC PDU comprises at least one of the following:
a first MAC sub-PDU, wherein the first MAC sub-PDU carries the first conflict resolution identifier, and the first conflict resolution identifier is a cell radio network temporary identifier (C-RNTI);
the second MAC sub-PDU, wherein the second MAC sub-PDU carries the second conflict resolution identifier;
the third MAC sub-PDU, wherein the third MAC sub-PDU carries the random access response (RAR).

### Claim 10 (depends on 9)

The random access device according to claim 9, wherein the RAR comprises uplink timing advance information, uplink scheduling information, and a temporary cell radio network temporary identifier (TC-RNTI).

### Claim 11 (depends on 9)

The random access device according to claim 9, wherein the type of the target MAC sub-PDU refers to the first MAC sub-PDU, the second MAC sub-PDU, or the third MAC sub-PDU.

### Claim 12 (depends on 11)

The random access device according to claim 11, wherein the first sub-header further carries the random access preamble ID (RAPID).

### Claim 13

A random access device, which is applied to a network device, the device comprising:
a receiver, configured to receive a first message sent by a user equipment (UE), wherein the first message comprises a preamble and an uplink data channel;
a transmitter, configured to transmit a scheduling instruction of a second message in a first window;
wherein the second message comprises at least one of the following: a first conflict resolution identifier, a second conflict resolution identifier, first indication information, and second indication information, wherein the first conflict resolution identifier is used for conflict resolution of a connected UE; the second conflict resolution identifier is used for conflict resolution of an idle UE, an inactive UE, or the connected UE; the first indication information is used for indicating that a two-step random access process returns to a four-step random access process;
the second message comprises a media access control (MAC) protocol data unit (PDU), and the MAC PDU comprises at least one of the following:
the second conflict resolution identifier; and
a random access response (RAR), and the RAR is used to indicate that the two-step random access process returns to the four-step random access process, wherein
the MAC PDU comprises a plurality of MAC sub-PDUs, which comprise a first sub-header and a target MAC sub-PDU, the first sub-header carries third indication information, and the third indication information is used to indicate a type of the target MAC sub-PDU, and the type of the target MAC sub-PDU refers to a second MAC sub-PDU or a third MAC sub-PDU, the first sub-header further carries second type information, and the second type information is used to indicate whether the first sub-header contains random access preamble ID (RAPID) or backoff indication (BI) information with backoff indication.

### Claim 14 (depends on 13)

The random access device according to claim 13, wherein the MAC PDU comprises at least one of the following:
a first MAC sub-PDU, wherein the first MAC sub-PDU carries the first conflict resolution identifier, and the first conflict resolution identifier is a cell radio network temporary identifier (C-RNTI);
the second MAC sub-PDU, wherein the second MAC sub-PDU carries the second conflict resolution identifier;
the third MAC sub-PDU, wherein the third MAC sub-PDU carries the random access response (RAR).