Method and radio network node for estimating channel quality
First Claim
1. A method performed by a radio network node for estimating channel quality for a downlink transmission to a user equipment, wherein the radio network node operates a radio carrier, forming a first sector and a second sector, wherein the user equipment is located in the first and second sectors, wherein the radio network node is configured to send, on at least one radio resource of the radio carrier, Channel State Information Reference Signals (CSI-RS) in the first and second sectors, wherein the user equipment is configured to receive, on the radio carrier, the downlink transmission from both the first and second sectors, the method comprising:
- receiving uplink reference signals from the user equipment;
determining a command based on the uplink reference signals, wherein the command indicates one of said at least one radio resource to be configured for reception of the CSI-RS in the user equipment;
sending the command to the user equipment, whereby the user equipment is able to measure Channel State Information (CSI) for the radio carrier according to the command;
receiving, from the user equipment, a set of CSI reports, wherein the CSI reports are generated by the user equipment according to the command;
receiving, on the radio carrier, further uplink reference signals from the user equipment, wherein the further uplink reference signals are closer in time than the uplink reference signals, on which the command was based, in relation to an upcoming time slot, in which the downlink transmission is to be transmitted; and
estimating channel quality for the downlink transmission based on the set of CSI reports and the further uplink reference signals.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and a radio network node for estimating channel quality for a downlink transmission to a user equipment. The radio network node operates a first sector and a second sector. The radio network node is configured to send CSI-RS in the first and second sectors. The radio network node receives uplink reference signals, and determines a command based on the uplink reference signals, wherein the command indicates one of said at least one radio resource to be configured for CSI-RS. The radio network node sends the command to the user equipment, and receives a set of CSI reports, wherein the reports are generated by the user equipment according to the command. The radio network node receives further uplink reference signals from the user equipment, and estimates channel quality for the downlink transmission based on the set of CSI reports and the further uplink reference signals.
24 Citations
20 Claims
-
1. A method performed by a radio network node for estimating channel quality for a downlink transmission to a user equipment, wherein the radio network node operates a radio carrier, forming a first sector and a second sector, wherein the user equipment is located in the first and second sectors, wherein the radio network node is configured to send, on at least one radio resource of the radio carrier, Channel State Information Reference Signals (CSI-RS) in the first and second sectors, wherein the user equipment is configured to receive, on the radio carrier, the downlink transmission from both the first and second sectors, the method comprising:
-
receiving uplink reference signals from the user equipment; determining a command based on the uplink reference signals, wherein the command indicates one of said at least one radio resource to be configured for reception of the CSI-RS in the user equipment; sending the command to the user equipment, whereby the user equipment is able to measure Channel State Information (CSI) for the radio carrier according to the command; receiving, from the user equipment, a set of CSI reports, wherein the CSI reports are generated by the user equipment according to the command; receiving, on the radio carrier, further uplink reference signals from the user equipment, wherein the further uplink reference signals are closer in time than the uplink reference signals, on which the command was based, in relation to an upcoming time slot, in which the downlink transmission is to be transmitted; and estimating channel quality for the downlink transmission based on the set of CSI reports and the further uplink reference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A radio network node configured to estimate channel quality for a downlink transmission to a user equipment, wherein the radio network node operates a radio carrier, forming a first sector and a second sector, wherein the user equipment is located in the first and second sectors, wherein the radio network node is configured to send, on at least one radio resource of the radio carrier, Channel State Information Reference Signals (CSI-RS) in the first and second sectors, wherein the user equipment is configured to receive, on the radio carrier, the downlink transmission from both the first and second sectors, the radio network node comprising processing circuitry to:
-
receive uplink reference signals from the user equipment; determine a command based on the uplink reference signals, wherein the command indicates one of said at least one radio resource to be configured for reception of the CSI-RS in the user equipment; send the command to the user equipment, whereby the user equipment is able to measure Channel State Information for the radio carrier according to the command; receive, from the user equipment, a set of CSI reports, wherein the reports are generated by the user equipment according to the command; receive, on the radio carrier, further uplink reference signals from the user equipment, wherein the further uplink reference signals are closer in time than the uplink reference signals, on which the command was based, in relation to an upcoming time slot, in which the downlink transmission is to be transmitted; and estimate channel quality for the downlink transmission based on the set of CSI reports and the further uplink reference signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification