Autonomous quasi co-location status redefinition by receiver in coordinated multipoint downlink
First Claim
1. A method of operating a User Equipment (UE) in a downlink of a wireless radiocommunication network operative to transmit signals from a plurality of transmission points, wherein first and second antenna ports are defined or signaled by the network to be quasi co-located (QCL), or to not be quasi-co-located, with respect to a given long term channel property, whereby the first and second antenna ports are QCL if the given long term channel property may be assumed to be the same for both the first and second antenna ports by the UE, the method comprising:
- ascertaining, by predefinition or signaling from the network, a default QCL status of the first and second antenna ports;
estimating, by the UE, one or more wireless network operating parameters;
wherein the estimating comprises estimating one or more of the signal to noise ratio (SNR) of received cell-specific reference signals (CRS), received channel state information reference signals (CSI-RS), or received demodulation reference signals (DMRS);
autonomously adopting an assumption of a QCL status, different from the default QCL status, of the first and second antenna ports, in response to the one or more wireless network operating parameters.
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Accused Products
Abstract
User Equipment, UE (30), in a wireless radiocommunication network (10) supporting Coordinated Multi-Point, CoMP, transmissions may autonomously adopt an assumption of the quasi co-located (QCL) status of two (or more) antenna ports that is different from the default QCL status defined or signaled by the network (10), in response to one or more estimates of certain operating parameter values. The altered QCL status assumption allows the UE (30) to correct parameter estimates more accurately, and/or to reduce complexity in the parameter estimation correction.
5 Citations
14 Claims
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1. A method of operating a User Equipment (UE) in a downlink of a wireless radiocommunication network operative to transmit signals from a plurality of transmission points, wherein first and second antenna ports are defined or signaled by the network to be quasi co-located (QCL), or to not be quasi-co-located, with respect to a given long term channel property, whereby the first and second antenna ports are QCL if the given long term channel property may be assumed to be the same for both the first and second antenna ports by the UE, the method comprising:
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ascertaining, by predefinition or signaling from the network, a default QCL status of the first and second antenna ports; estimating, by the UE, one or more wireless network operating parameters;
wherein the estimating comprises estimating one or more of the signal to noise ratio (SNR) of received cell-specific reference signals (CRS), received channel state information reference signals (CSI-RS), or received demodulation reference signals (DMRS);autonomously adopting an assumption of a QCL status, different from the default QCL status, of the first and second antenna ports, in response to the one or more wireless network operating parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A User Equipment (UE) operative in a wireless radiocommunication network transmitting signals from a plurality of transmission points, wherein first and second antenna ports are defined or signaled by the network to be quasi co-located (QCL), or to not be quasi co-located, with respect to a given long term channel property, whereby the first and second antenna ports are QCL if the given long term channel property may be assumed to be the same for both the first and second antenna ports by the UE, the UE comprising:
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radio circuitry operative to receive the signals from the network; memory; and processing circuitry operatively connected to the memory and the radio circuitry, the processing circuitry operative to; ascertain, by predefinition or signaling from the network, a default QCL status of the first and second antenna ports; estimate one or more wireless network operating parameters by estimating one or more of the signal to noise ratio (SNR) of received cell-specific reference signals (CRS), received channel state information reference signals (CSI-RS), or received demodulation reference signals (DMRS); autonomously adopt an assumption of a QCL status, different from the default QCL status, of the first and second antenna ports, in response to the one or more wireless network operating parameters. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification