Multi-TRP FDM Resource Segmentation for URLLC Reliability
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Solution Overview
Problem
Current multi-transmission reception point (TRP) schemes in 3GPP Rel-16 face challenges in achieving reliable and efficient transmission of ultra-reliable low latency communication (URLLC) services due to limitations in frequency domain multiplexing (FDM) schemes, which result in performance loss and increased code rate, especially when links between TRPs have varying quality.
Innovation Solution
Configuring multiple non-overlapping frequency resource regions within a single time domain resource, allowing each TRP to transmit a portion of the resources with different redundancy versions and MCS, enabling diversity gains and improved reliability through dynamic TCI associations across time domain repetition instances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency domain multiplexing (FDM) is used for multi-TRP transmission, then spectral efficiency is improved, but reliability deteriorates due to performance loss and increased code rate when TRP links have varying quality
Solution Approach 1:
The frequency resource is segmented into multiple non-overlapping frequency resource regions, with each region assigned to a different TRP for independent transmission. This segmentation allows each TRP to transmit independently without interfering with others, enabling the receiver to select the most reliable TRP based on link quality while maintaining spectral efficiency through parallel transmissions.
Solution Approach 2:
The patent dynamically changes the association between TCI states and frequency resource regions across different time domain repetition instances. This parameter change enables adaptive resource allocation that responds to varying TRP link qualities, allowing the system to optimize reliability by reconfiguring which TRP transmits on which frequency region based on current channel conditions.
2Speed
If multiple TRPs transmit simultaneously with FDM, then transmission speed is improved, but code rate increases leading to performance loss
Solution Approach 1:
Instead of requiring all TRPs to transmit on all frequency resources (excessive action), the system assigns only the necessary frequency regions to each TRP based on link quality assessment. This partial action approach ensures that each TRP transmits only when and where it can provide value, avoiding unnecessary code rate increases while maintaining high transmission speed through efficient resource utilization.
3Device complexity
If fixed TCI association is used across time domain repetitions, then configuration simplicity is improved, but adaptability deteriorates when TRP link quality changes
Solution Approach 1:
The patent introduces dynamic reconfiguration of TCI state associations with frequency resource regions across time domain repetition instances. This dynamic approach allows the system to adapt to changing TRP link qualities by reassigning which TCI state maps to which frequency region in each time instance, while maintaining configuration simplicity through standardized reconfiguration procedures.
Data Source
AI summary
In accordance with some embodiments, a method may include configuring, by a user equipment, at least a first transmission configuration index (TCI), a second TCI, and at least two non-overlapping frequency resource regions in a single time domain resource. The first TCI may be associated with at least one non-overlapped frequency resource region. The second TCI may be associated with at least one non-overlapped frequency resource region which not assigned to the first TCI. At least one association of a state of the first TCI, a state of the second TCI, and the at least one non-overlapping resource region may be changed in a next time domain repetition instance.