PDCCH Repetition ACK Handling Across TRPs for Reliable Uplink Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable and efficient transmission of control channels, particularly in environments with varying signal quality and interference, which can lead to reduced network performance and user experience.
Innovation Solution
Implementing control channel repetition across multiple transmission points (TRPs) with adaptive beam management and HARQ-ACK feedback mechanisms to enhance reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel repetition is implemented across multiple TRPs, then control channel reliability is improved, but device complexity and network configuration complexity increase
Solution Approach 1:
The control channel transmission is segmented across multiple Transmission Reception Points (TRPs), where each TRP independently transmits control channel repetitions. This segmentation improves reliability through diversity while the patent manages complexity by establishing standardized procedures for TRP coordination and acknowledgment handling.
Solution Approach 2:
The patent implements feedback mechanisms where the wireless device sends HARQ-ACK acknowledgments for received control channel repetitions. The network uses this feedback to determine whether retransmission is needed, creating a closed-loop system that improves reliability while managing complexity through automated decision-making based on received acknowledgments.
2Reliability
If HARQ-ACK feedback is transmitted for control channel repetitions, then transmission reliability is improved, but uplink resource consumption and network overhead increase
Solution Approach 1:
The patent applies partial action by having the wireless device send HARQ-ACK feedback only for a subset of received control channel repetitions rather than all repetitions. This reduces uplink resource consumption while maintaining sufficient reliability, as the network can determine retransmission needs based on partial acknowledgment information combined with other factors.
3Object-affected harmful factors
If control channel repetitions are transmitted across multiple TRPs, then signal interference is mitigated, but transmission time and processing delay increase
Solution Approach 1:
The patent employs periodic transmission of control channel repetitions across multiple TRPs at scheduled intervals. This periodic action mitigates signal interference through time diversity while managing transmission time by using structured timing patterns that allow efficient resource utilization and parallel processing at different TRPs.
Data Source
AI summary
A wireless device receives an indication of two search space sets for physical downlink control channel (PDCCH) repetition, each search space set of the two search space sets is associated with a respective control resource set (coreset) of two coresets. The wireless device receives, via at least one of one or more first monitoring occasions, a first downlink control information (DCI) scheduling an uplink shared channel transmission. The wireless device receives, via a second monitoring occasion of second monitoring occasions of PDCCH candidates corresponding to the two search space sets, a second DCI indicating transmission of an acknowledgement feedback for a physical downlink shared channel (PDSCH) reception. The wireless device sets, based on the second monitoring occasions being after the one or more first monitoring occasions, the acknowledgement feedback to a negative acknowledgement (NACK) value. The wireless device transmits the acknowledgement feedback in the uplink shared channel transmission.