US 2022/0070929 A1 · Resource Selection Using a Listen Before Talk Procedure

Abstract

Wireless communications between a base station and one or more wireless devices are described. Multiple downlink reference signals may correspond to multiple random access resources for a random access procedure. A base station may provide a set of downlink reference signals before a set of physical random access channels (PRACHs) are available for use. A wireless device performing a random access procedure may select two or more random access resources (e.g., PRACH occasions) based on the downlink reference signals. Using a listen before talk (LBT) procedure, the wireless device may select a first available random access resource from the two or more random access resources that are determined to be clear.

Claims32

Dependent claims

A method comprising:

receiving, by a wireless device, a plurality of downlink reference signals of a cell;
determining a first resource for random access, wherein the first resource is associated with a first downlink reference signal of the plurality of downlink reference signals of the cell;
determining, based on a failure of a first listen-before-talk (LBT) procedure, that the first resource is occupied;
determining, based on the failure of the first LBT procedure, a second resource for random access, wherein the second resource is associated with a second downlink reference signal of the plurality of downlink reference signals of the cell;
and
based on a success of a second LBT procedure, transmitting, via the second resource, a preamble for a random access procedure.

3 more elements

A wireless device comprising:

one or more processors;
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive a plurality of downlink reference signals of a cell;
determine a first resource for random access, wherein the first resource is associated with a first downlink reference signal of the plurality of downlink reference signals of the cell;
determine, based on a failure of a first listen-before-talk (LBT) procedure, that the first resource is occupied;
determine, based on the failure of the first LBT procedure, a second resource for random access, wherein the second resource is associated with a second downlink reference signal of the plurality of downlink reference signals of the cell;
and
based on a success of a second LBT procedure, transmit, via the second resource, a preamble for a random access procedure.

5 more elements

A system comprising:

a wireless device;
and
a base station,
wherein the base station is configured to:
transmit, to the wireless device, a plurality of downlink reference signals of a cell;
and
wherein the wireless device is configured to:
determine a first resource for random access, wherein the first resource is associated with a first downlink reference signal of the plurality of downlink reference signals of the cell;
determine, based on a failure of a first listen-before-talk (LBT) procedure, that the first resource is occupied;
determine, based on the failure of the first LBT procedure, a second resource for random access, wherein the second resource is associated with a second downlink reference signal of the plurality of downlink reference signals of the cell;
and
based on a success of a second LBT procedure, transmit, via the second resource, a preamble for a random access procedure.

9 more elements

A non-transitory computer-readable medium storing instructions that, when executed, configure a wireless device to:

receive a plurality of downlink reference signals of a cell;
determine a first resource for random access, wherein the first resource is associated with a first downlink reference signal of the plurality of downlink reference signals of the cell;
determine, based on a failure of a first listen-before-talk (LBT) procedure, that the first resource is occupied;
determine, based on the failure of the first LBT procedure, a second resource for random access, wherein the second resource is associated with a second downlink reference signal of the plurality of downlink reference signals of the cell;
and
based on a success of a second LBT procedure, transmit, via the second resource, a preamble for a random access procedure.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/522,588Filed 9 Nov 2021

Priority

9 Aug 2018

Published

3 Mar 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

H04W 74/0808
Non-scheduled access, e.g. ALOHA: using carrier sensing, e.g. carrier sense multiple access [CSMA]
H04B 7/0696
Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping: determining beam pairs
H04B 7/06964
Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping: re-selection of one or more beams after beam…
H04L 1/0026
Characterised by the signalling: transmission of channel quality indication

Family

Application62/716,895Us provisional application · filed 9 Aug 2018

Application16/536,788Continuation · filed 9 Aug 2019

Application17/522,588Continuation

US 11,219,062 B2Related patent

US 12,082,247 B2Related patent

US 2020/0053779 A1Published application

US 2022/0070929 A1This patent

From the US filing history. Foreign family members aren’t listed.

Resource Selection Using a Listen Before Talk Procedure

Life of this patent

Resource Selection Using a Listen Before Talk Procedure

Life of this patent

Abstract

Claims32