US 11,963,220 B2Granted

Channel access mechanisms in wireless communication

AssigneeApple Inc.

InventorsHong He, Dawei Zhang, Wei Zeng, Chunhai Yao, Haitong Sun, Yuchul Kim, Yushu Zhang, Yang Tang, Weidong Yang, Jie Cui, Oghenekome Oteri, Chunxuan Ye, Wei Zhang

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Abstract

Apparatuses, systems, and methods for selecting channel access mechanisms in wireless communications, and particularly in 3GPP NR-U. For example, an appropriate listen-before talk (LBT) channel access category (Cat) may be defined for certain messages, such as certain DL and/or UL control messages and certain RACH messages. For other messages, an appropriate Cat may be signaled by the base station, e.g., in a DCI message or SIB. Mechanisms are provided for the base station to signal to the UE certain channel access profile parameters, such as an appropriate LBT Cat, CAPC, and/or CP extension. Mechanisms are also provided for adjustment of contention window duration.

Claims18

Dependent claims

A wireless communication device, comprising:

a memory storing software instructions;
processor circuitry configured to implement the software instructions to cause the wireless communication device to:
receive, from a base station, a downlink control information (DCI) message including an indication of a first listen-before-talk (LBT) category and an indication of cyclic prefix information;
receive, from the base station, a second message indicating timing information for a channel occupancy time (COT) initiated by the base station after receiving the DCI message;
perform an LBT procedure based on an LBT category other than the first LBT category in response to determining, based on the timing information, that the particular time is within the COT;
perform an LBT procedure based on the first LBT category in response to determining, based on the timing information, that a particular time granted for uplink transmission is not within the COT;
and
in response to successful completion of the LBT procedure, transmit a message having a cyclic prefix based on the cyclic prefix information.

5 more elements

A wireless communication device, comprising:

a memory storing software instructions;
processor circuitry configured to implement the software instructions to cause the wireless communication device to:
receive, from a base station, a first message granting an uplink transmission at a particular time, the first message including an indication of a listen-before-talk (LBT) category to be used for the uplink transmission;
receive, from the base station, after receiving the first message, a second message indicating timing information for a channel occupancy time (COT) initiated by the base station;
determine whether the particular time is within the COT initiated by the base station, based on the timing information;
in response to determining that the particular time is not within the COT initiated by the base station, perform an LBT procedure defined by the LBT category indicated in the first message;
in response to determining that the particular time is within the COT initiated by the base station, perform an LBT procedure defined by a second LBT category, other than the LBT category indicated in the first message;
and
in response to successful completion of an LBT procedure, transmit the uplink transmission at the particular time.

6 more elements

A non-transitory computer-readable medium storing software instructions configured to, when executed by a processor of a wireless communication device, cause the wireless communication device to:

receive, from a base station, a first message granting an uplink transmission at a particular time, the first message including an indication of a listen-before-talk (LBT) category to be used for the uplink transmission;
determine whether the particular time is within a channel occupancy time (COT) initiated by the base station;
in response to determining that the particular time is not within the COT initiated by the base station, perform an LBT procedure defined by the LBT category indicated in the first message;
in response to determining that the particular time is within the COT initiated by the base station, perform an LBT procedure defined by a second LBT category, other than the LBT category indicated in the first message;
in response to successful completion of an LBT procedure, transmit the uplink transmission at the particular time;
and
receive, from the base station, a second message indicating timing information for the COT initiated by the base station, wherein determining whether the particular time is within the COT initiated by the base station is based on the timing information.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/053,718Filed 7 Nov 2019
Published: US 2022/0279579 A11 Sep 2022
Granted: 16 Apr 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04W 74/0808
Non-scheduled access, e.g. ALOHA: using carrier sensing, e.g. carrier sense multiple access [CSMA]
H04W 74/0816
Using carrier sensing, e.g. carrier sense multiple access [CSMA]: with collision avoidance
H04L 27/2607
Symbol extensions, e.g. Zero Tail, Unique Word [UW]: cyclic extensions
H04W 72/0446
Based on the type of the allocated resource: resources in time domain, e.g. slots or frames