Configurable PDSCH Rate Matching for Multi-TRP Collision Avoidance
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Solution Overview
Problem
Current wireless communication systems face challenges in rate matching around physical downlink shared channel (PDSCH) transmissions in multi-TRP scenarios, particularly with non-ideal backhaul, leading to collisions and 'PDSCH puncturing' due to inadequate synchronization and rate matching configurations.
Innovation Solution
The system introduces configurable PDSCH rate matching behavior for NZP CSI-RS resources, allowing the network to signal whether the UE should perform rate matching, using RRC, DCI, or MAC-CE based solutions, to avoid collisions with NZP CSI-RS resources used for channel or interference measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rate matching is performed around NZP CSI-RS resources in multi-TRP scenarios, then PDSCH transmission reliability is improved, but system complexity increases due to additional configuration and signaling requirements
Solution Approach 1:
The patent applies parameter changes by introducing configurable rate matching behavior parameters that can be dynamically adjusted. The network can signal different rate matching behaviors (e.g., rate match, puncture, or no rate matching) based on traffic conditions, channel state, and multi-TRP configuration, allowing the system to adapt between reliability and complexity requirements
Solution Approach 2:
The patent implements dynamics by making rate matching behavior configurable and changeable through network signaling (RRC, DCI, or MAC-CE). The rate matching configuration is not static but can be dynamically adjusted based on current network conditions, enabling the system to optimize between reliability and complexity in real-time
2Reliability
If configurable rate matching behavior is introduced for multi-TRP scenarios, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies universality by designing a multi-functional signaling framework that can convey rate matching behavior through multiple existing signaling mechanisms (RRC, DCI, MAC-CE). This allows the same rate matching information to be transmitted through different channels depending on the scenario, reducing the need for dedicated new signaling elements and minimizing overhead
Solution Approach 2:
The patent uses intermediaries by leveraging existing signaling protocols (RRC for configuration, DCI for dynamic indication, MAC-CE for intermediate control) as mediators to transmit rate matching behavior information. These existing signaling mechanisms serve as intermediaries between the network and UE, avoiding the need for direct new signaling channels and reducing overall overhead
3Productivity
If rate matching is performed to avoid collisions with NZP CSI-RS resources, then data transmission efficiency is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by configuring rate matching behavior in advance through RRC signaling before actual data transmission occurs. The UE receives and stores the rate matching configuration提前, so when PDSCH transmission needs to occur, the UE can immediately apply the pre-configured rate matching behavior without real-time calculation delays, thus improving transmission efficiency while maintaining accuracy
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for rate matching PDSCH around NZP CSI RS transmissions in multi-TRP scenarios. In some cases, a network entity may signal a rate matching behavior to a user equipment (UE) for processing a physical downlink shared channel (PDSCH) configured with a first quasi co-location association and transmitted from a first transmission reception point (TRP) that potentially collides with one or more types of non-zero power (NZP) reference signals (RS) configured with a second quasi co-location association and transmitted from a second TRP using one or more resource sets.