# US 12,193,049 B2 · Method for selecting random access resource and terminal

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- Number: US 12,193,049 B2
- Document ID: US12193049B2
- Status: Granted
- Kind: B2
- Application number: 17/381,264
- Filed: 2021-07-21
- Published: 2021-11-11
- Granted: 2025-01-07
- Earliest claimed: 2019-01-25
- Assignees: Vivo Mobile Communication Co., Ltd.
- Applicants: Vivo Mobile Communication Co.,Ltd.
- Inventors: Yumin Wu
- Web page: https://patentgrep.com/patent/US12193049B2

## CPC

- H04W 74/002: {Transmission of channel access control information}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Embodiments of this disclosure provide a method for selecting a random access resource and a terminal. The method includes: determining first information; and determining a random access resource based on a correspondence between first information and random access resources; where the first information includes any one of the following: a signal, an uplink carrier, or a random access procedure type.

## Claims

### Claim 1

A method for selecting a random access resource, comprising:
determining first information according to a rule for selecting a random access resource; and
determining a random access resource based on a correspondence between first information and random access resources; wherein
the first information comprises a signal;
wherein the rule for selecting the random access resource comprises:
determining an uplink carrier according to a rule for selecting the uplink carrier, determining a random access procedure type according to the uplink carrier and a rule for selecting the random access procedure type, and determining the signal according to the random access procedure type and a rule for selecting the signal; wherein the random access procedure type comprises one or more of the following: 2-step random access procedure or 4-step random access procedure;
wherein the rule for selecting the uplink carrier comprises:
selecting the uplink carrier based on a relationship between Reference Symbol Received Power (RSRP) of a downlink signal and an RSRP threshold; or
selecting, based on a measured result of RSRP for a cell, the uplink carrier corresponding to the cell;
wherein the rule for selecting the random access procedure type comprises one or more of the following:
selecting the random access procedure type based on an RSRP threshold;
selecting the random access procedure type based on a size of data in uplink transmission;
selecting the random access procedure type based on an RSRP threshold and a size of data in uplink transmission;
selecting the random access procedure type based on a random number;
selecting the random access procedure type based on a designated preferred random access procedure type;
wherein the rule for selecting the signal comprises selecting the signal based on a measurement threshold of the signal.

### Claim 2 (depends on 1)

The method according to claim 1, wherein after the determining the random access resource based on the correspondence between first information and random access resources, the method further comprises:
if the first information is the random access procedure type, and the random access procedure type is 2-step random access procedure, receiving a random access response after transmitting data carried by a data channel;
wherein the receiving the random access response after transmitting data carried by the data channel comprises:
starting a random access response (RAR) reception window timer after transmitting the data carried by the data channel.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the starting an RAR reception window timer after transmitting the data carried by the data channel comprises any one of the following:
after transmitting a request message carried by a physical uplink shared channel (PUSCH), starting the RAR reception window timer at a first physical downlink control channel (PDCCH) occasion configured for RAR reception; or
starting the RAR reception window timer at an end boundary of transmission of a request message carried by a PUSCH.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the uplink carrier according to the rule for selecting the uplink carrier, determining the signal according to the uplink carrier and the rule for selecting the signal, and determining the random access procedure type according to the signal and the rule for selecting the random access procedure type;
determining the signal according to the rule for selecting the signal, determining the random access procedure type according to the signal and the rule for selecting the random access procedure type, and determining the uplink carrier according to the random access procedure type and the rule for selecting the uplink carrier;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the uplink carrier according to the random access procedure type and the rule for selecting the uplink carrier, and determining the signal according to the uplink carrier and the rule for selecting the signal; or
determining the random access procedure type according to the rule for selecting the signal, determining the signal according to the random access procedure type and the rule for selecting the signal, and determining the uplink carrier according to the signal and the rule for selecting the uplink carrier.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the uplink carrier according to the rule for selecting the uplink carrier, and determining the random access procedure type according to the uplink carrier and the rule for selecting the random access procedure type;
determining the random access procedure type according to the rule for selecting the random access procedure type, and determining the uplink carrier according to the random access procedure type and the rule for selecting the uplink carrier;
determining the signal according to the rule for selecting the signal, and determining the random access procedure type according to the signal and the rule for selecting the random access procedure type; or
determining the random access procedure type according to the rule for selecting the random access procedure type, and determining the signal according to the random access procedure type and the rule for selecting the signal.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the determining the first information according to the rule for selecting the random access resource comprises any one of the following:
in a case that random access resources are configured on a plurality of uplink carriers corresponding to a cell, and that at least two random access procedure types are configured for the random access resources, determining the uplink carrier according to the rule for selecting the uplink carrier, and determining the random access procedure type according to the uplink carrier and the rule for selecting the random access procedure type; or
in a case that random access resources are configured on a plurality of uplink carriers corresponding to a cell, and that at least two random access procedure types are configured for the random access resources, determining the random access procedure type according to the rule for selecting the random access procedure type, and determining the uplink carrier according to the random access procedure type and the rule for selecting the uplink carrier.

### Claim 7 (depends on 5)

The method according to claim 5, wherein the determining the first information according to the rule for selecting the random access resource comprises any one of the following:
in a case that corresponding signals are configured for random access resources, and that at least two random access procedure types are configured for the random access resources, determining the signal according to the rule for selecting the signal, and determining the random access procedure type according to the signal and the rule for selecting the random access procedure type; or
in a case that corresponding signals are configured for random access resources, and that at least two random access procedure types are configured for the random access resources, determining the random access procedure type according to the rule for selecting the random access procedure type, and determining the signal according to the random access procedure type and the rule for selecting the signal.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the random access procedure type according to the rule for selecting the random access procedure type, and selecting one uplink carrier from a plurality of uplink carriers corresponding to random access resources corresponding to the random access procedure type; or
determining a plurality of uplink carriers according to the rule for selecting the uplink carrier, selecting one uplink carrier from the plurality of uplink carriers, determining the random access procedure type according to the uplink carrier and the rule for selecting the random access procedure type; or determining the random access procedure type according to the rule for selecting the random access procedure type.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the random access procedure type according to the rule for selecting the random access procedure type, determining a plurality of signals corresponding to random access resources corresponding to the random access procedure type, and selecting one signal from the plurality of signals; or
determining a plurality of uplink carriers according to the rule for selecting the uplink carrier, selecting one uplink carrier from the plurality of uplink carriers, and determining the random access procedure type according to the uplink carrier and the rule for selecting the random access procedure type.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the uplink carrier according to the rule for selecting the uplink carrier, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, determining another uplink carrier according to the rule for selecting the uplink carrier;
determining the uplink carrier according to the rule for selecting the uplink carrier, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, determining another random access procedure type according to the rule for selecting the random access procedure type;
determining the uplink carrier according to the rule for selecting the uplink carrier, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, selecting another uplink carrier;
determining the uplink carrier according to the rule for selecting the uplink carrier, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, selecting another random access procedure type; or
determining the uplink carrier according to the rule for selecting the uplink carrier, determining the random access procedure type according to the rule for selecting the random access procedure type, and if only random access resources corresponding to one random access procedure type are on the uplink carrier, selecting the random access procedure type corresponding to the uplink carrier.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the uplink carrier according to the rule for selecting the uplink carrier, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, determining another uplink carrier according to the rule for selecting the uplink carrier;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the uplink carrier according to the rule for selecting the uplink carrier, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, determining another random access procedure type according to the rule for selecting the random access procedure type;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the uplink carrier according to the rule for selecting the uplink carrier, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, selecting another uplink carrier;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the uplink carrier according to the rule for selecting the uplink carrier, and if no random access resource corresponding to the random access procedure type is on the uplink carrier, selecting another random access procedure type; or
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the uplink carrier according to the rule for selecting the uplink carrier, and if random access resources corresponding to the random access procedure type are only on one uplink carrier, selecting the uplink carrier.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the signal according to the rule for selecting the signal, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type corresponds to the signal, determining another signal according to the rule for selecting the signal;
determining the signal according to the rule for selecting the signal, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type corresponds to the signal, determining another random access procedure type according to the rule for selecting the random access procedure type;
determining the signal according to the rule for selecting the signal, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type corresponds to the signal, selecting the signal corresponding to the random access resource;
determining the signal according to the rule for selecting the signal, determining the random access procedure type according to the rule for selecting the random access procedure type, and if no random access resource corresponding to the random access procedure type corresponds to the signal, selecting another random access procedure type; or
determining the signal according to the rule for selecting the signal, determining the random access procedure type according to the rule for selecting the random access procedure type, and if the signal corresponds to only one random access procedure type, selecting the random access procedure type.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access resource further comprises at least one of the following:
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the signal according to the rule for selecting the signal, and if no random access resource corresponding to the random access procedure type corresponds to the signal, determining another signal according to the rule for selecting the signal;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the signal according to the rule for selecting the signal, and if no random access resource corresponding to the random access procedure type corresponds to the signal, determining another random access procedure type according to the rule for selecting the random access procedure type;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the signal according to the rule for selecting the signal, and if no random access resource corresponding to the random access procedure type corresponds to the signal, selecting the signal corresponding to the random access resource;
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the signal according to the rule for selecting the signal, and if no random access resource corresponding to the random access procedure type corresponds to the signal, selecting another random access procedure type; or
determining the random access procedure type according to the rule for selecting the random access procedure type, determining the signal according to the rule for selecting the signal, and if random access resources corresponding to the random access procedure type correspond to only one signal, selecting the signal.

### Claim 14 (depends on 1)

The method according to claim 1, wherein the signal comprises any one of the following:
a reference signal; wherein the reference signal is a synchronization signal block (SSB) and/or a channel state information-reference signal (CSI-RS);
a measurement symbol corresponding to a cell;
a measurement subframe corresponding to a cell;
a measurement slot corresponding to a cell;
a measurement symbol corresponding to a frequency;
a measurement subframe corresponding to a frequency; or
a measurement slot corresponding to a frequency.

### Claim 15 (depends on 1)

The method according to claim 1, wherein a random access request message in the 2-step random access procedure comprises one or more of the following:
a transmission resource for a random access request data information;
a transmission resource for a random access request control information;
a signal corresponding to a transmission resource; or
a carrier corresponding to a transmission resource.

### Claim 16 (depends on 1)

The method according to claim 1, wherein the rule for selecting the random access procedure type means that the random access procedure type is selected based on threshold, wherein different random access procedure types correspond to different thresholds, and the threshold is any one of the following: the measurement threshold of the signal or a size threshold of uplink transmission data.

### Claim 17 (depends on 1)

The method according to claim 1, wherein the 2-step random access procedure comprises a step of transmitting MsgA and a step of receiving MsgB, wherein MsgA comprises data.

### Claim 18

A terminal, comprising a processor, a memory, and a program stored in the memory and capable of running on the processor, wherein the program is executed by the processor to implement:
determining first information according to a rule for selecting a random access resource; and
determining a random access resource based on a correspondence between first information and random access resources; wherein
the first information comprises a signal;
wherein the rule for selecting the random access resource comprises:
determining an uplink carrier according to a rule for selecting the uplink carrier, determining a random access procedure type according to the uplink carrier and a rule for selecting the random access procedure type, and determining the signal according to the random access procedure type and a rule for selecting the signal; wherein the random access procedure type comprises one or more of the following: 2-step random access procedure or 4-step random access procedure;
wherein the rule for selecting the uplink carrier comprises:
selecting the uplink carrier based on a relationship between Reference Symbol Received Power (RSRP) of a downlink signal and an RSRP threshold; or
selecting, based on a measured result of RSRP for a cell, the uplink carrier corresponding to the cell;
wherein the rule for selecting the random access procedure type comprises one or more of the following:
selecting the random access procedure type based on an RSRP threshold;
selecting the random access procedure type based on a size of data in uplink transmission;
selecting the random access procedure type based on an RSRP threshold and a size of data in uplink transmission;
selecting the random access procedure type based on a random number;
selecting the random access procedure type based on a designated preferred random access procedure type;
wherein the rule for selecting the signal comprises selecting the signal based on a measurement threshold of the signal.

### Claim 19

A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement:
determining first information according to a rule for selecting a random access resource; and
determining a random access resource based on a correspondence between first information and random access resources; wherein
the first information comprises a signal;
wherein the rule for selecting the random access resource comprises:
determining an uplink carrier according to a rule for selecting the uplink carrier, determining a random access procedure type according to the uplink carrier and a rule for selecting the random access procedure type, and determining the signal according to the random access procedure type and a rule for selecting the signal; wherein the random access procedure type comprises one or more of the following: 2-step random access procedure or 4-step random access procedure;
wherein the rule for selecting the uplink carrier comprises:
selecting the uplink carrier based on a relationship between Reference Symbol Received Power (RSRP) of a downlink signal and an RSRP threshold; or
selecting, based on a measured result of RSRP for a cell, the uplink carrier corresponding to the cell;
wherein the rule for selecting the random access procedure type comprises one or more of the following:
selecting the random access procedure type based on an RSRP threshold;
selecting the random access procedure type based on a size of data in uplink transmission;
selecting the random access procedure type based on an RSRP threshold and a size of data in uplink transmission;
selecting the random access procedure type based on a random number;
selecting the random access procedure type based on a designated preferred random access procedure type;
wherein the rule for selecting the signal comprises selecting the signal based on a measurement threshold of the signal.