Dynamic Configured Grants for Mixed URLLC and eMBB Traffic
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Solution Overview
Problem
Current solutions for dynamic and configured grants in New Radio (NR) systems face challenges in accommodating mixed services of Ultra-Reliable Low-Latency Communication (URLLC) and enhanced Mobile Broadband (eMBB), leading to issues such as weak spectral efficiency, increased latency, and misalignment of data arrival with fixed grant configurations.
Innovation Solution
The implementation of dynamic and flexible configurations for configured grants, allowing multiple configurations per cell and Bandwidth Part (BWP), with a single pattern indicating multiple transmission occasions, and the ability to activate or deactivate Type 2 configurations independently, reduces misalignment delay and improves spectral efficiency while satisfying URLLC requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed grant configurations are used for uplink transmissions, then scheduling simplicity is maintained, but spectral efficiency deteriorates due to misalignment between data arrival and grant transmission occasions
Solution Approach 1:
The patent implements dynamic configured grant configurations where transmission occasions are not fixed but can be adjusted based on data arrival patterns. The network can dynamically activate or deactivate specific configured grant configurations and modify transmission parameters such as periodicity, time offsets, and resource allocations to align with actual traffic patterns, thereby improving spectral efficiency while maintaining scheduling manageability through a structured framework.
Solution Approach 2:
The patent enables modification of key parameters including periodicity, time domain offsets, frequency domain allocations, and resource block assignments for configured grants. By dynamically changing these parameters based on traffic conditions and data arrival patterns, the system optimizes spectral efficiency without requiring complete reconfiguration of the grant structure, balancing flexibility with operational simplicity.
2Adaptability or versatility
If multiple configured grant configurations are implemented per cell and BWP, then adaptability to mixed services (URLLC and eMBB) is improved, but device complexity increases
Solution Approach 1:
The patent segments configured grant configurations into multiple independent configurations, each optimized for specific service types (e.g., one configuration for URLLC with short periodicity and another for eMBB with longer periodicity). Each configuration can be independently activated, deactivated, or modified based on service requirements. This segmentation allows the system to handle mixed services effectively while keeping each individual configuration relatively simple and manageable.
Solution Approach 2:
The patent creates a universal configured grant framework that can accommodate multiple service types through a common configuration structure. The same configured grant mechanism serves both URLLC and eMBB requirements by allowing dynamic parameter adjustment and selective activation of different configurations within the same cell and BWP, reducing the need for separate management systems for different service types.
3Loss of time
If configured grants are used for URLLC transmissions, then latency is reduced through pre-configured resources, but spectral efficiency worsens due to rigid transmission timing that cannot adapt to actual data arrival
Solution Approach 1:
The patent applies dynamic adjustments to configured grant parameters including periodicity, time domain offsets, and resource allocations. This allows the system to maintain the low-latency benefits of pre-configured grants for URLLC while adapting transmission timing and resources to actual data arrival patterns, preventing waste from rigid scheduling and improving overall spectral efficiency through flexible reconfiguration.
Data Source
AI summary
Systems and methods for dynamic and flexible configurations for configured grants are provided. In some embodiments, a method performed by a wireless device for configuring uplink grants includes receiving, from a network node, one or more indications to enable one or more configured grant configurations per cell and/or per BWP where at least one configured grant configuration indicating a plurality of transmission occasions within a period. The method also includes transmitting at least one transmission based on the at least one configured grant configuration. This may enable the use of different periodicity of mixed Time Sensitive Network (TSN), random Ultra-Reliable Low-Latency Communication (URLLC), and enhanced Mobile Broadband (eMBB) traffics; reduce the misalignment delay of the arrived data; improve the spectral efficiency of the eMBB traffic while satisfying the URLLC requirement; and/or reduce the number of Hybrid Automatic Repeat Request processes needed to transmit a considerable number of Configured Grant configurations.