US 11,387,873 B2 · Reference resource indication techniques in wireless communications

Abstract

Methods, systems, and devices for wireless communications are described. One or more reference signals may be transmitted by a user equipment (UE) that may be used by a base station for channel estimation and determination of one or more parameters to be used for subsequent uplink transmission of the UE. The base station may transmit an indication of uplink transmission parameters in an uplink grant that is transmitted to the UE. The UE may modify one or more subsequent reference signal transmissions based on the uplink grant received from the base station and a timing of the uplink grant relative to the one or more subsequent reference signal transmissions. The base station may determine a timing for the uplink grant based on a timing associated with the reference signal transmissions from the UE.

Claims26

Dependent claims

A method for wireless communication, comprising:

transmitting a first reference signal using a first set of reference signal resources, the first set of reference signal resources associated with a first set of reference signal ports having a first precoding configuration applied to a set of antenna ports;
receiving an uplink grant and a sounding reference signal (SRS) resource indicator (SRI) that indicates at least one reference signal port from the first set of reference signal ports is to be used for an uplink transmission,
wherein a second reference signal is to be transmitted after receiving the uplink grant and before the uplink transmission, the second reference signal associated with a second set of reference signal resources;
and
dropping transmission of the second reference signal based at least in part on the receiving the uplink grant.

2 more elements

A method for wireless communication, comprising:

receiving, from a user equipment (UE), a first reference signal that is transmitted using a first set of reference signal resources, the first set of reference signal resources being associated with a first set of reference signal ports having a first precoding configuration applied to a set of antenna ports of the UE;
selecting at least one reference signal port from the first set of reference signal ports to be used by the UE for a first uplink transmission;
transmitting an uplink grant and a sounding reference signal (SRS) resource indicator (SRI) to the UE that indicates the at least one reference signal port for the first uplink transmission,
wherein a second reference signal is to be transmitted by the UE before the first uplink transmission, the second reference signal to be transmitted using a second set of reference signal resources associated with a second set of reference signal ports having a second precoding configuration applied to the set of antenna ports;
and
refraining from monitoring for a reference signal from the UE until receiving the first uplink transmission, the refraining being based at least in part on at least one of a determination that a transmission of the second reference signal will be dropped or the transmitting the uplink grant.

3 more elements

A method for wireless communication, comprising:

transmitting a first reference signal using a first set of reference signal resources, the first set of reference signal resources being associated with a first set of reference signal ports having a first precoding configuration applied to a set of antenna ports;
receiving an uplink grant that indicates at least one reference signal port from the first set of reference signal ports is to be used for an uplink transmission;
and
receiving an indication of a time difference threshold associated with a timing of receiving the uplink grant, wherein whether a subset of reference signal resources to be used for a first uplink transmission is to be selected from the first set of reference signal resources is based at least in part on the received indication of the time difference threshold.

1 more element

A method for wireless communication, comprising:

receiving, from a user equipment (UE), a first reference signal that is transmitted using a first set of reference signal resources, the first set of reference signal resources being associated with a first set of reference signal ports having a first precoding configuration applied to a set of antenna ports of the UE;
selecting at least one reference signal port from the first set of reference signal ports to be used by the UE for a first uplink transmission;
transmitting an indication of a time difference threshold associated with a timing of an uplink grant, wherein a timing for transmitting the uplink grant to the UE that indicates the at least one reference signal port for the first uplink transmission is based at least in part on the time difference threshold;
and
transmitting the uplink grant to the UE according to the timing for transmitting the uplink grant to the UE.

2 more elements

Dependencies are inferred from the claim text.

Reference resource indication techniques in wireless communications

Life of this patent

Reference resource indication techniques in wireless communications

Life of this patent

Abstract

Claims26