A-ZP-CSI-RS Mapping for Selective Multi-Slot PDSCH Rate Matching
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, inefficiently apply aperiodic zero power channel state information reference signals (A-ZP-CSI-RS) across all scheduled slots for physical downlink shared channel (PDSCH) transmissions, leading to resource wastage as rate matching is unnecessary for all slots.
Innovation Solution
The system allows for a triggered A-ZP-CSI-RS set to be applied to less than all scheduled PDSCH slots by extending CSI-RS resource mapping to span multiple slots, indicating an initial symbol of a plurality of symbols for each A-ZP-CSI-RS resource, enabling efficient rate matching only on a subset of slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If A-ZP-CSI-RS is applied to all scheduled PDSCH slots, then channel state information accuracy is maintained, but resource utilization deteriorates due to unnecessary rate matching
Solution Approach 1:
The patent applies different rate matching behaviors to different slots based on local conditions. Specifically, rate matching is applied only to slots where A-ZP-CSI-RS is actually transmitted, while skipping slots where it is not transmitted. This local differentiation resolves the contradiction by maintaining CSI accuracy only where needed while avoiding unnecessary resource consumption in other slots.
Solution Approach 2:
Instead of applying rate matching to all scheduled slots (excessive action), the patent applies it only to the subset of slots where A-ZP-CSI-RS is transmitted (partial action). This partial application of rate matching maintains the necessary channel state information accuracy while significantly reducing the resource overhead and improving overall resource utilization efficiency.
2Reliability
If rate matching is applied to all PDSCH slots, then communication reliability is improved, but system productivity deteriorates due to increased overhead
Solution Approach 1:
The patent implements local quality by applying rate matching only to specific slots where A-ZP-CSI-RS is transmitted rather than uniformly to all slots. This ensures communication reliability is maintained for slots requiring it while improving system productivity by reducing overhead in slots where rate matching is unnecessary.
3Measurement precision
If A-ZP-CSI-RS is triggered for all slots, then channel measurement accuracy is maintained, but resource wastage increases
Solution Approach 1:
The patent applies partial action by triggering A-ZP-CSI-RS and applying rate matching only to the necessary subset of slots rather than all slots. This maintains channel measurement accuracy where required while reducing resource wastage by avoiding redundant A-ZP-CSI-RS transmissions and rate matching operations in slots where they are not needed.
Data Source
AI summary
Aspects of the present disclosure allow for more efficient rate matching by allowing a triggered A-ZP-CSI-RS set to support rate matching around multiple slots. Aspects of the present disclosure may allow a triggered A-ZP CSI-RS set to be applied to less than all scheduled PDSCH slots when DCI schedules PDSCH on multiple slots. Aspects of the present disclosure may extend CSI-RS resource mapping to span multiple adjacent slots. In another instance, aspects of the present disclosure allow a resource mapping configuration to indicate an initial symbol of a plurality of symbols spanning the plurality of slots for a respective A-ZP-CSI-RS resource. Doing so also allows a PDSCH transmission in a slot among the plurality of slots using a rate matching pattern associated with a set of A-ZP-CSI-RE resources to be received. In addition, aspects of the present disclosure can also add periodicity to A-ZP-CSI-RS resource set configuration.