Beam refinement during RACH
First Claim
1. 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.
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Accused Products
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).
7 Citations
19 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification