UE Channel Quality Reporting via xPUCCH Modes
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and 5G networks, user equipment (UE) faces challenges in efficiently reporting channel state information (CSI) and beam quality indicators (BQI) to base stations, which affects modulation and coding schemes, and beamforming processes, due to limitations in current reporting modes and channels.
Innovation Solution
The UE employs multiple reporting modes (e.g., modes 2-0, 3-0, 1-1, 1-2) to transmit CSI and BQI feedback over the extra-large physical uplink control channel (xPUCCH), including CQI, PMI, RI, BI, BRSID, and BQI, based on downlink control information (DCI) and higher layer signaling, allowing for flexible beamforming and dual beam operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reporting modes are implemented for CSI and BQI feedback, then the accuracy and efficiency of channel quality reporting is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic reporting modes where the UE can switch between different reporting configurations (wideband CQI, subband CQI, beam quality indicators) based on current channel conditions and network requirements. This dynamic adaptation allows the system to optimize reporting accuracy for specific scenarios without permanently increasing complexity across all operating conditions.
Solution Approach 2:
The patent applies different reporting precision levels to different channel aspects: wideband CQI for overall channel quality, subband CQI for frequency-selective regions, and beam-specific BQI for directional quality assessment. This localized quality approach ensures high measurement precision where needed while reducing reporting overhead in other areas.
2Loss of information
If multiple CQI and BQI values are reported simultaneously, then the information completeness is improved, but the loss of time for reporting increases
Solution Approach 1:
The patent segments channel state information reporting into multiple independent components: wideband CQI, subband CQI, beam quality indicators, and precoding matrix indicators. These segmented reports can be transmitted in separate time slots or combined selectively, allowing the system to provide complete information over time while managing instantaneous reporting time constraints.
Solution Approach 2:
The patent implements periodic reporting mechanisms where different types of CSI and BQI information are reported at different intervals based on their importance and change rate. Critical information like beam quality indicators may be reported more frequently, while wideband CQI may use longer intervals, optimizing the balance between information completeness and reporting time.
Data Source
AI summary
An apparatus of a user equipment (UE) may include a memory and one or more processors operatively coupled to the memory device. The processors determine a reporting mode for the UE based on a message received at the UE from an eNodeB. The UE may generate a channel state information (CSI) reporting message based on the determined reporting mode. The processors may also encode extra-large physical uplink control channel (xPUCCH) data including the CSI reporting message.