Multi-TRP PUCCH Slot Selection for Beam Failure Resilience
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Solution Overview
Problem
In New Radio (NR) multi-TRP operations, the complexity of blind search for downlink control information decoding is similar to legacy systems, and beam link failures at the primary coordinating TRP can affect all other TRPs, leading to potential transmission interruptions, especially in ultra-reliable low-latency applications.
Innovation Solution
A method and apparatus for multi-TRP transmission, where a wireless transmit/receive unit (WTRU) receives parameter sets and physical downlink control channel (PDCCH) transmissions from multiple TRPs, decodes K1 values, determines PDSCH reception slots, and selects a PUCCH slot location based on comparison of candidate slots, ensuring continuity of transmissions even if all candidate slots are not the same.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple NR-PDCCHs are used for scheduling from separate TRPs, then scheduling flexibility and transmission diversity are improved, but the complexity of blind detection increases and the effective search space size increases
Solution Approach 1:
The patent segments the search space into multiple candidate sets, each associated with a specific TRP. This allows the WTRU to perform blind detection on multiple PDCCHs from different TRPs independently, improving scheduling flexibility while managing detection complexity through structured organization of search candidates.
Solution Approach 2:
The patent introduces a new dimension for organizing search space by associating candidate PDCCHs with specific TRPs and determining their locations based on TRP-specific parameters. This dimensional organization allows the system to handle multiple TRPs efficiently without linearly increasing overall complexity.
2Productivity
If centralized coordination is used at one gNB for multiple TRPs, then network-wide optimization is improved, but reliability deteriorates because beam link failure at the primary coordinating TRP affects all other TRPs
Solution Approach 1:
The patent enables each TRP to have independent scheduling capabilities with its own search space configuration and PDCCH transmission. This local autonomy ensures that beam link failure at one TRP does not affect others, improving reliability while maintaining network-wide coordination through shared backhaul connectivity.
Solution Approach 2:
The patent implements dynamic TRP selection and independent PDCCH scheduling where each TRP can autonomously make scheduling decisions based on local channel conditions. This dynamic independence allows the system to adapt to beam failures by switching to other TRPs without centralized coordination bottlenecks.
3Reliability
If multiple TRPs transmit simultaneously with independent scheduling, then transmission diversity and reliability are improved, but coordination complexity between TRPs increases
Solution Approach 1:
The patent pre-configures search space parameters and PDCCH candidate locations for each TRP before transmission. This preliminary configuration reduces real-time coordination complexity by establishing predetermined rules for PDCCH placement and search space organization that TRPs can follow independently.
Data Source
AI summary
A method of multi-transmit/receive point (multi-TRP) transmission. The method comprises receiving a parameter set and a physical downlink control channel (PDCCH) transmission from each of multiple TRPs; decoding each received PDCCH transmission to obtain a K1 value for each of the multiple TRPs based on each received parameter set; receiving a physical downlink shared channel (PDSCH) transmission from each of the multiple TRPs; determining a PDSCH reception slot location for each received PDSCH transmission; determining, based on each determined PDSCH reception slot location and each obtained K1 value, a candidate PUCCH slot location for each of the multiple TRPs; and determining a selected PUCCH slot location for the multiple TRPs based on comparison of all of the determined candidate PUCCH slot locations, wherein if all of the determined candidate PUCCH slot locations are not the same, the selected PUCCH slot location is a farthest candidate PUCCH slot location.