Rate Matching Around Aperiodic CSI-RS Using Zero-Power Signals
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Solution Overview
Problem
Conventional wireless communication systems do not allow rate matching during downlink transmissions around aperiodic reference signals triggered by uplink control signals, limiting rate matching operations at user equipment (UE) during downlink transmissions.
Innovation Solution
The described techniques enable rate matching around aperiodic channel state information reference signals (A-CSI-RS) by using zero-power (ZP) reference signals and determining support for search space sharing, with rate matching supported when the signal triggering the A-CSI-RS is received far enough in advance or on the same component carrier as the downlink transmission, and refraining from rate matching when overlapping with another transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rate matching is performed around aperiodic reference signals triggered by uplink control signals, then rate matching capabilities during downlink transmissions are improved, but system complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by requiring that the uplink control signal triggering the aperiodic reference signal be received a specific number of slots before the downlink transmission. This advance timing allows the UE to prepare rate matching operations in advance, reducing real-time processing complexity while maintaining enhanced rate matching capabilities.
Solution Approach 2:
The patent implements dynamics by making rate matching behavior conditional based on UE capability indicators and timing relationships. The system dynamically adjusts whether to perform rate matching around aperiodic reference signals based on whether the UE supports this feature and whether the triggering signal is received early enough, balancing capability enhancement with processing complexity.
2Productivity
If rate matching is performed around aperiodic reference signals, then communication efficiency is improved, but the risk of overlapping with other transmissions increases
Solution Approach 1:
The patent applies preliminary anti-action by establishing conditions that prevent harmful overlaps before they occur. The UE determines whether to perform rate matching based on advance timing criteria (signal received N slots before) and capability indicators, proactively avoiding situations where rate matching would conflict with other transmissions rather than reacting to overlaps after they occur.
Solution Approach 2:
The system uses feedback through UE capability indicators to determine whether rate matching around aperiodic reference signals should be performed. The UE provides feedback about its capabilities, and the system adjusts rate matching behavior accordingly, allowing efficient operation when capabilities exist while avoiding unreliable operations when they don't.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a downlink control information message scheduling a downlink transmission that comprises a zero-power reference signal for the UE to use for rate matching during the downlink transmission. The UE may receive a signal triggering transmission of an aperiodic reference signal during the downlink transmission. The UE may determine whether the UE supports search space sharing. The UE may perform, upon determining that the UE supports search space sharing, rate matching around the aperiodic reference signal.