US 10,651,913 B2Granted

Beam refinement during RACH

AssigneeOfinno, LLC

InventorsHyoungsuk Jeon, Esmael Dinan, Kyungmin Park, Hua Zhou, Alireza Babaei

Life of this patent

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Abstract

A base station transmits to a wireless device, a first request to measure synchronization signal(s) of a first cell. The base station receives from the wireless device, measurement report(s) of at least one synchronization signal of the synchronization signal(s). The base station transmits to the wireless device, a second request to measure CSI-RS(s) of the first cell. The base station receives from the wireless device, second measurement report(s) of the CSI-RS(s). The second measurement report(s) are generated in response to the second request. The base station selects first CSI-RS(s) of the CSI-RS(s) based on the second measurement report(s). The base station transmits a downlink control information to the wireless device via one or more control channels. The downlink control information initiates a random access procedure of the first cell. The downlink control information comprises an indication of the first CSI-RS(s).

Claims19

Dependent claims

A method comprising:

transmitting, by a base station to a wireless device, a first request to measure one or more synchronization signals of a first cell;
receiving, by the base station from the wireless device, at least one first measurement report of at least one synchronization signal of the one or more synchronization signals;
selecting, by the base station, one or more channel state information reference signals (CSI-RSs) of the first cell based on:
the at least one first measurement report;
and
a first antenna port of the one or more CSI-RSs being quasi-colocated with a second port of the at least one synchronization signal;
receiving, by the base station from the wireless device, at least one second measurement report of the one or more CSI-RSs;
selecting, for a random access procedure of the first cell and based on the at least one second measurement report, at least one first CSI-RS of the one or more CSI-RSs;
and
transmitting, based on the at least one first CSI-RS, a downlink control information initiating the random access procedure of the first cell.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/101,132Filed 10 Aug 2018 · us provisional application
Priority: 10 Aug 2017
Published: US 2019/0052334 A114 Feb 2019
Granted: 12 May 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04B 7/0626
Feedback content: channel coefficients, e.g. channel state information [CSI]
H04J 11/0073
Cell search, i.e. determining cell identity [cell-ID]: acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
H04J 11/0076
Cell search, i.e. determining cell identity [cell-ID]: acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
H04J 13/0062
CAZAC [constant-amplitude and zero auto-correlation]: zadoff-Chu