Feedback Resource Allocation for URLLC Delay Reduction
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Solution Overview
Problem
In New Radio (NR) Rel-15, the HARQ timing indication based on a slot level may not meet the transmission delay requirements for URLLC services, which are sensitive to transmission delays.
Innovation Solution
A method for allocating feedback resources is introduced, where the allocation is limited by feedback multiplexing granularity or feedback timing granularity, represented by a slot, half-slot, or N symbols, to reduce time delays, and an alternative approach where allocation is not limited by these granularities but by a preset time domain threshold value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ timing indication based on slot level is used, then the system maintains compatibility with existing NR Rel-15 standards, but the transmission delay requirement for URLLC services cannot be met
Solution Approach 1:
The patent segments the feedback resource allocation into two distinct modes: slot-level granularity for eMBB services and sub-slot granularity (symbol-level) for URLLC services. This segmentation allows each service type to use the appropriate time granularity, resolving the contradiction between standard compatibility and low latency requirements.
Solution Approach 2:
The patent introduces dynamic feedback resource allocation where the time granularity (slot or sub-slot) can be flexibly selected based on service requirements. The network can dynamically configure different feedback timing indicators (K1 values) for different services, enabling the system to adapt between slot-level and sub-slot-level allocations as needed.
2Loss of time
If feedback resource allocation is limited by feedback multiplexing granularity or feedback timing granularity, then transmission delay is reduced for delay-sensitive services, but the system complexity increases
Solution Approach 1:
The patent applies local quality by implementing different feedback resource allocation granularities for different service types and different time domains. Normal eMBB services use slot-level granularity while URLLC services use sub-slot granularity. This localized differentiation reduces feedback delay for critical services without unnecessarily complicating the overall system.
Solution Approach 2:
The patent changes the time granularity parameter from fixed slot-level to variable sub-slot-level (symbol-level) allocation. By introducing a new parameter dimension (feedback timing granularity) with multiple possible values (slot, half-slot, N symbols), the system can optimize feedback delay for specific services while managing complexity through parameterization rather than structural redesign.
3Productivity
If feedback resources are allocated with fine-grained time domain resolution, then URLLC service requirements are met, but resource overhead and configuration complexity increase
Solution Approach 1:
The patent creates a universal feedback resource allocation framework that can handle both eMBB and URLLC services through a single configurable mechanism. The same feedback resource allocation structure supports both slot-level and sub-slot-level granularities, allowing the system to serve multiple service types without requiring separate dedicated mechanisms for each.
Solution Approach 2:
The patent implements preliminary action by pre-configuring feedback resource pools with different granularity options before actual service transmission. The network pre-allocates feedback resources with various K1 values and time domain configurations, so that when URLLC traffic arrives, the appropriate pre-configured resources can be immediately assigned without complex real-time calculations.
Data Source
AI summary
Disclosed are a feedback resource allocation method, a terminal device, a network device, a chip, a computer readable storage medium, a computer program product, and a computer program. The method includes: receiving feedback resource configuration information sent by a network side, wherein the feedback resource configuration information is used for allocating feedback resources, and the allocation of the feedback resources is limited by feedback multiplexing granularity or feedback timing granularity, wherein the feedback multiplexing granularity represents a time-domain range of a multiplexing window for feedback information. The time-domain range is: a time slot, a half time slot, and N symbols, and N is an integer greater than or equal to 1; the feedback timing granularity is one of the following: the time slot, the half time slot, and N symbols, and N is the integer greater than or equal to 1.