Configured Grant HARQ Prioritization for URLLC Latency
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Solution Overview
Problem
In wireless communication systems, particularly in unlicensed bands, there is a challenge in prioritizing resources for URLLC (Ultra-Reliable and Low-Latency Communications) transmissions effectively, as existing methods do not adequately manage HARQ (Hybrid Automatic Repeat and Request) processes to meet the stringent latency and reliability requirements.
Innovation Solution
A method is introduced where a terminal and base station communicate through configured grant (CG) resources, with the terminal receiving CG configuration information including intra-CG prioritization settings via RRC messages, allowing it to select and transmit MAC PDUs using the HARQ process with the highest priority, ensuring optimal resource allocation for URLLC communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple HARQ processes are managed without prioritization in configured grant resources, then resource utilization is simplified, but URLLC latency and reliability requirements cannot be met
Solution Approach 1:
The patent segments HARQ processes into different priority levels (first priority and second priority), allowing the system to differentiate and manage critical URLLC traffic separately from non-critical traffic. This segmentation enables reliable low-latency communication for high-priority processes while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent changes the parameter of HARQ process selection by introducing priority-based selection criteria. Instead of arbitrary or round-robin selection, the system selects HARQ processes based on priority parameters, ensuring that URLLC traffic receives preferential treatment for meeting reliability and latency requirements.
2Loss of time
If HARQ processes are selected without prioritization, then resource allocation is simpler, but transmission latency increases for critical data
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority levels for different HARQ processes before transmission occurs. The base station configures the terminal with priority information for each HARQ process, enabling the terminal to immediately select the appropriate high-priority process when URLLC data arrives, thus minimizing latency without complex real-time decision-making.
Solution Approach 2:
The patent introduces dynamic priority-based selection where the terminal can adaptively choose which HARQ process to use based on the priority of incoming data and current resource availability. This dynamic approach ensures critical URLLC traffic experiences minimal latency while maintaining operational simplicity through automated priority-based decisions.
3Productivity
If configured grant resources are allocated without intra-CG prioritization, then configuration complexity is reduced, but uplink grant priority cannot be maximized
Solution Approach 1:
The patent segments configured grant resources into multiple priority levels (first priority CG resources and second priority CG resources). This segmentation allows the system to allocate resources efficiently based on traffic priority, maximizing uplink transmission efficiency for URLLC while maintaining clear configuration structures that manage complexity.
Solution Approach 2:
The patent changes the configuration parameters by introducing priority indicators for different CG resources. The base station configures the terminal with priority information associated with each CG resource, enabling the terminal to select resources that maximize uplink transmission efficiency for high-priority traffic while keeping configuration management tractable through structured parameter organization.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security- and safety-related services, and the like) on the basis of a 5G communication technology and an IoT-related technology. Disclosed are a method and apparatus for prioritizing an HAQR process of a CG resource in a wireless communication system.