Aperiodic CSI Multiplexing Over Multi-TRP PUSCH
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Solution Overview
Problem
In New Radio (NR) up to Release 16, aperiodic Channel State Information (CSI) reports are sent only once on Physical Uplink Shared Channel (PUSCH) even when PUSCH is repeated, leading to reliability issues in frequency range 2 (FR2) due to channel blocking, especially with multi-Transmission/Reception Point (TRP) deployments.
Innovation Solution
The method involves repeating PUSCH over multiple occasions with spatial relations and/or Uplink Transmission Configuration Indicator (TCI) states, and multiplexing Aperiodic CSI (A-CSI) with PUSCH on multiple transmission occasions, ensuring A-CSI is received by at least one TRP, thereby improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aperiodic CSI is sent only once on PUSCH even when PUSCH is repeated, then device complexity is reduced, but reliability deteriorates due to channel blocking in FR2
Solution Approach 1:
The patent segments the A-CSI transmission across multiple PUSCH occasions instead of sending it once. Each PUSCH occasion is associated with a different spatial relation or TCI state, dividing the transmission task into multiple independent attempts that increase the probability of successful reception despite channel blocking.
Solution Approach 2:
The patent introduces a spatial dimension to A-CSI transmission by associating different PUSCH occasions with different spatial relations or TCI states. This transforms a single-dimension transmission problem into a multi-dimensional solution where diversity in spatial paths mitigates the impact of channel blocking.
2Reliability
If PUSCH is repeated over multiple occasions with different spatial relations, then A-CSI reliability is improved, but loss of time increases due to multiple transmission occasions
Solution Approach 1:
The patent employs periodic repetition of PUSCH transmissions with different spatial relations or TCI states. This periodic action ensures that A-CSI is transmitted multiple times across different time occasions, increasing the likelihood of successful reception while managing time consumption through structured repetition patterns.
3Loss of information
If A-CSI is multiplexed with PUSCH on multiple transmission occasions, then information loss is reduced, but device complexity increases
Solution Approach 1:
The patent merges A-CSI with PUSCH transmissions on multiple occasions, combining the control information (A-CSI) with the data channel (PUSCH) in a unified multiplexing scheme. This approach ensures A-CSI delivery while utilizing existing PUSCH resources across multiple transmissions.
Data Source
AI summary
Systems and methods for aperiodic Channel State Information (CSI) over multi-Transmission/Reception Point (TRP) Physical Uplink Shared Channel (PUSCH) are provided. In some embodiments, a method performed by a wireless device for providing feedback includes: repeating PUSCH over multiple M>1 PUSCH occasions with P spatial relations and/or Uplink Transmission Configuration Indicator (TCI) states; and multiplexing Aperiodic CSI (A-CSI) with PUSCH on N>=1 PUSCH transmission occasions wherein N includes at least one PUSCH transmission occasion associated with each of the P spatial relations or UL TCI states. This may enable improved A-CSI reliability in multi-TRP scenarios. By repeating A-CSI (multiplexed with PUSCH or not multiplexed with PUSCH) over multiple TRPs, the reliability of A-CSI can be improved since the A-CSI can be received by at least one TRP. This method is particularly beneficial in FR2 cases where the channel between a TRP and a UE can experience channel blocking.