PUCCH Priority Mapping for Unicast and MBS HARQ Feedback
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Solution Overview
Problem
The challenge of selecting PUCCH resources for transmitting HARQ feedback information in a New Radio (NR) system where both unicast and Multicast Broadcast Service (MBS) HARQ feedback coexist, with existing solutions lacking effective mechanisms for resource allocation.
Innovation Solution
A method for priority-based pre-allocation of PUCCH resources to multiple HARQ codebooks, ensuring that HARQ feedback information for unicast and MBS is transmitted efficiently by determining a corresponding relationship between PUCCH configurations and HARQ codebooks based on priority information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device camps on a cell with a large downlink-uplink gain difference, then the terminal device can operate in a suitable bandwidth, but the uplink coverage is limited and the terminal device cannot transmit data at the edge of coverage
Solution Approach 1:
The patent applies dynamics by making the terminal device's uplink bandwidth adaptive rather than static. The device dynamically adjusts its uplink transmission bandwidth based on the downlink received bandwidth and measured signal quality (RSRP/RSRQ), allowing it to operate at optimal bandwidth for each transmission opportunity rather than being constrained to a fixed bandwidth or maximum bandwidth throughout.
Solution Approach 2:
The patent changes the bandwidth parameter dynamically. Specifically, the terminal device determines its uplink transmission bandwidth part (BWP) based on the downlink BWP and adjusts transmission parameters including bandwidth, power, and resource allocation according to measured signal quality, thereby adapting to varying channel conditions at the cell edge.
2Reliability
If the terminal device transmits data at the edge of coverage, then uplink coverage is improved, but the terminal device consumes more power and generates more interference
Solution Approach 1:
The patent optimizes power consumption by dynamically adjusting transmission parameters including power, bandwidth, and resource allocation based on measured signal quality. The terminal device calculates appropriate transmission power and bandwidth for each uplink transmission opportunity, avoiding excessive power consumption while maintaining reliable communication at the cell edge.
Solution Approach 2:
The system dynamically adjusts transmission power and bandwidth based on real-time channel conditions. Rather than using fixed high power to ensure coverage, the terminal device adapts its power level according to measured RSRP/RSRQ, consuming only the necessary power for reliable transmission at each moment.
3Productivity
If the terminal device uses a fixed bandwidth for uplink transmission, then the device complexity is reduced, but the transmission efficiency decreases when channel conditions vary
Solution Approach 1:
The patent implements dynamic bandwidth adaptation where the terminal device adjusts its uplink transmission bandwidth based on the configured downlink BWP and measured signal quality. This allows the device to optimize transmission efficiency for varying channel conditions while the network maintains control over the adaptation process through configuration parameters.
Solution Approach 2:
The terminal device measures uplink signal quality (RSRP/RSRQ) and uses this feedback to determine appropriate uplink transmission parameters including bandwidth and power. This closed-loop feedback mechanism enables efficient adaptation to channel conditions while keeping the device complexity manageable through standardized measurement and reporting procedures.
Data Source
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AI summary
Embodiments of the present application provide a wireless communication method and a terminal device. In the case of simultaneous presence of HARQ feedback for unicast and HARQ feedback for MBS, the HARQ feedback for the unicast and the HARQ feedback for the MBS may be transmitted on the basis of PUCCH resources having different priorities, thus ensuring the reliability of transmission for the HARQ feedback for the unicast and the HARQ feedback for the MBS. The wireless communication method comprises: a terminal device determines, according to a first corresponding relationship, a PUCCH configuration for transmitting at least one hybrid automatic repeat request (HARQ) codebook, wherein the first corresponding relationship comprises a corresponding relationship between the PUCCH configuration and the HARQ codebook and determined on the basis of priority information, and the HARQ codebook in the at least one HARQ codebook comprises HARQ feedback information for the unicast and/or HARQ feedback information for the MBS.