CSI-RS Power Averaging Within COT for NR-U Channel Noise Estimation
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Solution Overview
Problem
In unlicensed spectrum, the unpredictable channel access procedures in New Radio (NR-U) lead to varying DL transmission powers, making it challenging for user equipment (UE) to accurately determine CSI-RS power, which affects channel noise estimation performance.
Innovation Solution
UE determines CSI-RS occasions within a channel occupancy duration (COT) indicated by DCI format 2_0 or using a timer, or within a set of DL transmissions with small gaps, to average measurements when power is consistent, and applies specific averaging rules based on configuration parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel access procedures are implemented in unlicensed spectrum to achieve fair coexistence, then coexistence fairness is improved, but DL transmission power becomes unpredictable and varying
Solution Approach 1:
The network performs preliminary actions by indicating a channel occupancy duration (COT) in advance via DCI format 2_0 or using a timer. This allows the UE to pre-determine which CSI-RS occasions fall within the same COT and should be averaged together, resolving the power variation issue before measurements are taken.
Solution Approach 2:
The patent changes the parameter of power consistency by grouping CSI-RS occasions that occur within the same COT. By identifying occasions within a defined time window (COT) and applying averaging only to those occasions, the system transforms the variable power scenario into a controlled averaging process that yields consistent results.
2Adaptability or versatility
If DL transmission power varies due to unpredictable channel access procedures, then channel access flexibility is improved, but CSI-RS power determination accuracy deteriorates
Solution Approach 1:
The patent applies local quality by treating different CSI-RS occasions differently based on their temporal relationship to the COT. Instead of applying a uniform averaging rule to all occasions, the network identifies specific occasions within the COT window and applies averaging only to those, while leaving other occasions to be processed separately.
Solution Approach 2:
The network provides preliminary information about the COT through DCI format 2_0 or timer configuration, enabling the UE to pre-identify which CSI-RS occasions should be grouped together for averaging. This preliminary action ensures accurate power determination even when overall transmission power varies.
3Ease of operation
If CSI-RS power determination is performed without considering COT, then processing simplicity is improved, but channel noise estimation performance deteriorates
Solution Approach 1:
The patent introduces dynamics by making the averaging behavior conditional rather than static. The UE dynamically determines whether to average CSI-RS measurements based on whether they fall within the same COT, as indicated by the network. This dynamic approach maintains simplicity for occasions outside COT while improving accuracy for occasions within COT.
Data Source
AI summary
A method of a user equipment (UE) in a wireless communication network and a UE are provided. The method includes receiving, from the network, at least one downlink (DL) transmission, determining, by the UE, channel resource information reference signal (CSI-RS) occasions in the at least one DL transmission, determining, by the UE, whether a power of each of the CSI-RS occasions is the same, and averaging, by the UE, corresponding measurements when the power of each of the CSI-RS occasions is determined to be the same.