Multi-TRP Resource Allocation for URLLC DCI Payload Reduction
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Solution Overview
Problem
Current 5G NR technologies face challenges in efficiently allocating resources for ultra-reliable and low latency (URLLC) communications using multiple transmission reception points (TRPs), particularly in reducing payload size of downlink control information (DCI) and optimizing resource block allocation for improved spatial diversity.
Innovation Solution
The proposed solution involves allocating resource blocks into portions based on a resource indication value (RIV), length of contiguously allocated resource blocks (LRBS), and a fraction, with specific fractions indicating the distribution between different TRPs for efficient transmission, utilizing frequency division multiplexing (FDM) to enhance URLLC transmission reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If resource blocks are allocated using conventional methods for multi-TRP URLLC, then the DCI payload size increases, but resource allocation efficiency decreases
Solution Approach 1:
The resource blocks are segmented into two distinct portions: a first portion allocated via a first resource indication value (RIV) for first TRPs, and a second portion allocated via a second RIV for second TRPs. This segmentation allows the DCI to efficiently represent multi-TRP resource allocations without requiring excessively large payload sizes, as each RIV independently describes a contiguous resource block allocation for its respective TRP group.
Solution Approach 2:
The patent introduces new parameters including a first resource indication value (RIV) for first TRPs, a second RIV for second TRPs, and a TRP association indicator that maps TRPs to specific resource portions. These parameter changes enable compact representation of complex multi-TRP resource allocations, reducing DCI payload size while maintaining allocation efficiency.
2Reliability
If multiple TRPs are used for URLLC transmission, then spatial diversity and reliability improve, but system complexity increases
Solution Approach 1:
The system segments the multi-TRP transmission into two independent resource allocation schemes: first TRPs with their own RIV and resource portion, and second TRPs with their own RIV and resource portion. This segmentation simplifies the overall system complexity by breaking down the complex multi-TRP coordination into manageable, independent allocation units while maintaining spatial diversity for improved reliability.
Solution Approach 2:
Different quality parameters are applied to different TRP groups through the TRP association indicator, which associates specific TRPs with specific resource portions. This allows the system to optimize resource allocation locally for each TRP group while maintaining overall system reliability through spatial diversity, without requiring uniform complex coordination across all TRPs.
3Ease of operation
If resource blocks are allocated contiguously, then allocation simplicity increases, but flexibility for multi-TRP distribution decreases
Solution Approach 1:
The patent segments the contiguous resource block allocation into two separate contiguous allocations: a first contiguous allocation described by a first RIV for first TRPs, and a second contiguous allocation described by a second RIV for second TRPs. This segmentation maintains the simplicity of contiguous allocation within each TRP group while providing the flexibility needed for multi-TRP distribution through the TRP association indicator.
Solution Approach 2:
The introduction of separate RIV parameters for first and second TRPs, along with the TRP association indicator, enables the system to maintain contiguous allocation simplicity within each group while achieving versatile multi-TRP distribution. The parameter changes allow independent control of resource distribution flexibility without sacrificing allocation simplicity.
Data Source
AI summary
An approach is described for an access node configured for ultra-reliable and low latency (URLLC) transmission using multi-transmission reception point (TRP) to a UE. The access node includes processor circuitry and radio front end circuitry. The processor circuitry is configured to allocate resource blocks into a first portion and a second portion based on a resource indication value (RIV), a length of contiguously allocated resource blocks (LRBS) and a fraction. The radio front end circuitry is configured to transmit the first portion to the UE via a first transmission reception point (TRP1), and transmit the second portion to the UE via a second transmission reception point (TRP2).