# US 11,452,134 B2 · Channel access method and device, storage medium, terminal, and base station

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- Number: US 11,452,134 B2
- Document ID: US11452134B2
- Status: Granted
- Kind: B2
- Application number: 17/042,559
- Filed: 2019-04-02
- Published: 2021-04-29
- Granted: 2022-09-20
- Earliest claimed: 2018-04-04
- Assignees: Spreadrum Communications (Shanghai) Co., Ltd.
- Applicants: Spreadrum Communications (Shanghai) Co., Ltd.
- Inventors: Meng Zhang
- Web page: https://patentgrep.com/patent/US11452134B2

## CPC

- H04L 5/0023: {Time-frequency-space}
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- 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 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/002: {Transmission of channel access control information}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A channel access method and device, a storage medium, a terminal, a terminal, and a base station are provided. The method comprises: receiving configuration information, the configuration comprising configuration information of at least one available bandwidth configured to perform an LBT operation, and the at least one available bandwidth is a portion of bandwidth of a carrier; performing the LBT operation on the at least one available bandwidth indicated by the configuration information to listen to a channel; and when the LBT operation on any one of the at least one available bandwidth succeeds, performing uplink data transmission on the available bandwidth to access the channel. By providing the method where LBT is achieved based on a portion of bandwidth of a carrier on an unlicensed band, the UE may better meet OCB requirements for transmitted signals on the unlicensed band in the NR system.

## Claims

### Claim 1

A channel access method, comprising:
receiving configuration information, wherein the configuration information comprises configuration information of at least one available bandwidth that is configured to perform an LBT operation, and the at least one available bandwidth is a portion of bandwidth of a carrier;
performing the LBT operation on the at least one available bandwidth indicated by the configuration information to listen to a channel; and
when the LBT operation on any one of the at least one available bandwidth succeeds, performing uplink data transmission on the available bandwidth to access the channel,
wherein each of the at least one available bandwidth is associated with at least one listen direction that is determined based on spatial configuration of a reference signal resource, and performing the LBT operation on the at least one available bandwidth indicated by the configuration information comprises: for each of the at least one available bandwidth, performing the LBT operation in each listen direction associated with the available bandwidth.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
before receiving the configuration information, transmitting LBT capability report information, wherein the LBT capability report information indicates the number of the at least one available bandwidth that is configured to perform the LBT operation.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the LBT capability report information is selected from a group consisting of:
the number of one or more available bandwidths for the LBT operation simultaneously performed on one carrier;
the number of one or more available bandwidths for the LBT operation simultaneously performed on a plurality of carriers;
the number of one or more available bandwidths for the LBT operation performed on one carrier; and
the number of one or more available bandwidths for the LBT operation performed on a plurality of carriers.

### Claim 4 (depends on 1)

The method according to claim 1, wherein for each of the at least one available bandwidth, performing the LBT operation in each listen direction associated with the available bandwidth comprises:
detecting an idle status of the channel within a first preset duration, wherein the first preset duration is indicated based on the configuration information;
if a detection result within the first preset duration indicates that the channel is in the idle status, for each listen direction associated with the available bandwidth, after the first preset duration expires, determining a count value, wherein the count value indicates whether to listen to the channel in the listen direction associated with the available bandwidth, and is a random number selected from a preset range which is determined based on a preset value and the configuration information;
continuing detecting the idle status of the channel within a second preset duration;
if a detection result within the second preset duration indicates that the channel is in the idle status, determining whether the count value is zero; and
if the count value is zero, determining that the LBT operation in the listen direction associated with the available bandwidth succeeds.

### Claim 5 (depends on 4)

The method according to claim 4, wherein for each of the at least one available bandwidth, performing the LBT operation in each listen direction associated with the available bandwidth further comprises:
when the count value is not zero, decreasing the count value by one, and continuing detecting the idle status of the channel within the second preset duration until the detection result within the second preset duration indicates that the channel is in the idle status.

### Claim 6 (depends on 4)

The method according to claim 4, wherein performing uplink data transmission on the available bandwidth to access the channel comprises:
performing uplink data transmission in the listen direction associated with the available bandwidth in which direction the LBT operation succeeds, to access the channel.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the at least one available bandwidth is selected from a group consisting of BWP and subband.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the configuration information is selected from a group consisting of:
position indication information of the at least one available bandwidth;
type indication information of LBT;
spatial configuration indication information of LBT, used to indicate the listen direction where the LBT operation is performed;
indication information of a channel access level; and
activation indication information of LBT and timer indication information.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the configuration information is carried by any of a high-layer signaling, a PDCCH, or a MAC-CE.

### Claim 10 (depends on 1)

A storage medium having computer instructions stored therein, wherein when the computer instructions are executed, the method according to claim 1 is performed.

### Claim 11 (depends on 1)

A terminal comprising a memory and a processor, wherein the memory has computer instructions stored therein, and when the processor executes the computer instructions, the method according to claim 1 is performed.

### Claim 12

A channel access method, comprising:
determining configuration information based on LBT capability of a UE, and transmitting the configuration information, wherein the configuration information comprises configuration information of at least one available bandwidth that is configured for the UE to perform an LBT operation, and the at least one available bandwidth is a portion of bandwidth of a carrier; and
in response to receiving uplink data, allowing or rejecting the UE to access a channel to which the uplink data points, wherein the uplink data is transmitted when the LBT operation performed by the UE on any one of the at least one available bandwidth succeeds,
wherein each of the at least one available bandwidth is associated with at least one listen direction that is determined based on spatial configuration of a reference signal resource, and for each of the at least one available bandwidth, the UE performs the LBT operation in each listen direction associated with the available bandwidth.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the LBT capability of the UE is determined based on LBT capability report information reported by the UE.

### Claim 14 (depends on 13)

The method according to claim 13, wherein the LBT capability report information is selected from a group consisting of:
the number of one or more available bandwidths for the LBT operation simultaneously performed on one carrier;
the number of one or more available bandwidths for the LBT operation simultaneously performed on a plurality of carriers;
the number of one or more available bandwidths for the LBT operation performed on one carrier; and
the number of one or more available bandwidths for the LBT operation performed on a plurality of carriers.

### Claim 15 (depends on 12)

The method according to claim 12, wherein the LBT capability of the UE is acquired via pre-interaction with the UE.

### Claim 16 (depends on 12)

The method according to claim 12, wherein the at least one available bandwidth is selected from a group consisting of BWP and subband.

### Claim 17 (depends on 12)

The method according to claim 12, wherein the configuration information is selected from a group consisting of:
position indication information of the at least one available bandwidth;
type indication information of LBT;
spatial configuration indication information of LBT, used to indicate the listen direction where the LBT operation is performed;
indication information of a channel access level; and
activation indication information of LBT and timer indication information.

### Claim 18 (depends on 12)

The method according to claim 12, wherein the configuration information is carried by any of a high-layer signaling, a PDCCH, or a MAC-CE.

### Claim 19 (depends on 12)

A base station comprising a memory and a processor, wherein the memory has computer instructions stored therein, and when the processor executes the computer instructions, the method according to claim 12 is performed.