Multiplexing CSI Reports in Multi-TRP Scenarios
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Solution Overview
Problem
In wireless communication systems, particularly in multiple transmit-receive point (TRP) scenarios, channel state information (CSI) reports intended for different TRPs often collide due to overlapping resources, leading to decoding issues and increased latency in non-ideal backhaul conditions, which affects the reliability and relevance of CSI for determining channel conditions.
Innovation Solution
A method where user equipment (UE) receives configurations identifying resources for multiplexing CSI reports, determines potential collisions, and transmits these reports to respective TRPs in separate non-overlapping resources, based on payload size and prioritization criteria, to avoid collisions and improve decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CSI reports are transmitted in overlapping resources to different TRPs, then resource utilization is improved, but decoding reliability deteriorates due to collisions
Solution Approach 1:
The patent segments the transmission resources for different TRPs by introducing a time offset parameter. CSI reports for different TRPs are transmitted in different time slots (separated by the offset), preventing resource collisions while maintaining efficient resource utilization across multiple TRPs
Solution Approach 2:
The patent adds a time dimension to the resource allocation by introducing a time offset between CSI report transmissions to different TRPs. This transforms the problem from a 2D resource conflict (frequency and spatial domains) to a 3D solution that includes time separation, eliminating collisions while preserving resource efficiency
2Reliability
If CSI reports are transmitted in separate non-overlapping resources to different TRPs, then decoding reliability is improved, but resource utilization deteriorates
Solution Approach 1:
The patent introduces dynamic resource allocation where the time offset between CSI report transmissions can be adjusted based on system conditions. This allows the system to optimize between reliability and resource utilization dynamically, rather than using fixed separate resources
3Productivity
If CSI reports are multiplexed in the same resource, then resource efficiency is improved, but latency increases due to collision resolution in non-ideal backhaul conditions
Solution Approach 1:
The patent applies preliminary action by pre-configuring a time offset between CSI report transmissions to different TRPs. This prevents collisions before they occur, eliminating the need for retransmissions and collision resolution procedures that would increase latency in non-ideal backhaul conditions
4Reliability
If a time offset is introduced between CSI report transmissions to different TRPs, then resource collisions are avoided, but transmission time increases
Solution Approach 1:
The patent optimizes the time offset parameter to achieve the minimum necessary separation between CSI report transmissions. By carefully selecting this parameter, the system avoids collisions while minimizing the additional transmission time, balancing reliability and latency requirements
Data Source
AI summary
This disclosure provides systems, methods, apparatuses, and computer-readable media for multiplexing channel state information (CSI) reports in scenarios involving multiple transmit-receive points (TRPs). In one aspect, a user equipment (UE) may receive at least one configuration that identifies a resource for multiplexing CSI reports that have a potential to collide in a slot. The UE may receive the at least one configuration from either, or both, of a first TRP or a second TRP. The UE may transmit at least one of a first set of CSI reports to the first TRP or a second set of CSI reports to the second TRP, multiplexed in the resource, according to the at least one configuration.