PUCCH Resource Selection with CSI-Part 2 Bit Reference Rules
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Solution Overview
Problem
In New Radio (NR) mobile communication, when the physical uplink control channel (PUCCH) for transmitting HARQ-ACK/NACK (AN)/scheduling request (SR) and the PUCCH for transmitting channel state information (CSI) share the same starting symbol, the base station faces challenges in determining the PUCCH resource set due to varying bit quantities, leading to blind-detection of all possible resources.
Innovation Solution
Determine a reference bit quantity of CSI-part 2 using a preset rule, calculate the sum of bit quantities for AN/SR and CSI, and select the target PUCCH resource set accordingly, ensuring both the UE and the base station have a common understanding of the resource set for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the base station monitors all possible PUCCH resources for AN/SR and CSI transmission, then no information is lost, but the detection complexity and time consumption increase significantly
Solution Approach 1:
The patent extracts CSI-part2 from the general CSI transmission and handles it separately. The base station monitors PUCCH resources based on whether CSI-part2 is present or not, rather than monitoring all possible resources for all cases. This extraction principle allows the system to reduce detection complexity by dividing the monitoring scope into two distinct scenarios: one for transmissions without CSI-part2 and another for transmissions with CSI-part2.
Solution Approach 2:
The patent segments the PUCCH resource monitoring into two distinct sets: PUCCH resources for transmitting AN/SR and CSI without CSI-part2, and PUCCH resources for transmitting AN/SR and CSI with CSI-part2. This segmentation allows the base station to selectively monitor appropriate resource sets based on the presence of CSI-part2, thereby reducing overall detection complexity while ensuring no information is lost.
2Measurement precision
If the PUCCH resource set is determined based on actual CSI bit quantity, then resource allocation is accurate, but the base station cannot determine the resource set due to variable bit quantities
Solution Approach 1:
The patent implements a feedback mechanism where the UE notifies the base station about the presence or absence of CSI-part2 in its transmission. This feedback information allows the base station to accurately determine which PUCCH resource set to monitor, matching the UE's actual transmission behavior. The feedback resolves the information asymmetry between UE and base station, enabling precise resource set determination without the base station needing to know the exact CSI bit quantity in advance.
3Reliability
If the base station performs blind detection on all PUCCH resources, then all transmissions can be detected, but the detection time and processing overhead increase
Solution Approach 1:
The patent introduces dynamic PUCCH resource set selection based on the presence of CSI-part2. Instead of using a fixed monitoring approach for all transmissions, the base station dynamically adjusts which resource set to monitor based on feedback from the UE about whether CSI-part2 is included. This dynamic approach maintains detection reliability by ensuring the correct resource set is monitored while significantly reducing detection time by avoiding unnecessary monitoring of irrelevant resources.
Data Source
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AI summary
A physical uplink control channel resource determination method and a communication device are disclosed in embodiment of this disclosure. The method includes: determining a reference bit quantity of CSI-part 2 according to a preset rule; determining a sum of reference bit quantities of AN/SR and CSI according to the reference bit quantity, wherein the CSI at least includes: CSI-part 1 and the CSI-part 2; determining a target PUCCH RESET according to the sum of reference bit quantities.