Uplink Grant Resource Selection for 5G URLLC Delay Reduction
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Solution Overview
Problem
Current communication methods in 5G systems, such as LTE and NR, face challenges in reducing transmission delay for delay-sensitive services like URLLC and deterministic networks, as existing resource mapping techniques do not adequately consider the high delay requirements of these services.
Innovation Solution
The proposed communication method involves determining an appropriate uplink grant resource based on the time-domain position and remaining time of scheduled resources, ensuring that delay-sensitive data is transmitted on a resource with sufficient time availability to meet the required delay thresholds, rather than relying solely on the arrival sequence of uplink grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resource mapping is performed based on the sequence of receiving uplink grants, then the resource allocation process is simple and follows a clear order, but the transmission delay for delay-sensitive services increases
Solution Approach 1:
The patent changes the parameter used for resource mapping from 'arrival sequence of uplink grants' to 'time-domain position of uplink grant resources'. This parameter change allows the system to select resources based on their actual transmission timing rather than scheduling order, thereby reducing transmission delay for delay-sensitive services while maintaining operational simplicity through clear selection criteria.
2Adaptability or versatility
If existing resource mapping techniques are used, then the system maintains compatibility with standard LTE and NR protocols, but the delay requirements of URLLC and deterministic network services are not met
Solution Approach 1:
The patent segments the resource mapping process into two parts: maintaining standard protocol compatibility for general services while introducing a specialized resource selection mechanism for delay-sensitive services. This segmentation allows the system to handle different service types with different requirements independently, ensuring both protocol compatibility and low-latency performance where needed.
Solution Approach 2:
The patent applies local quality by making the resource mapping behavior service-specific. For delay-sensitive services like URLLC, the system uses time-domain position-based selection to minimize delay, while other services continue to use sequence-based mapping. This localized optimization ensures that protocol compatibility is maintained overall while specific local requirements for low-latency services are satisfied.
3Device complexity
If uplink grant resources are allocated without considering time-domain positions, then the scheduling process is straightforward, but the remaining time for data transmission is insufficient for delay-sensitive services
Solution Approach 1:
The patent applies preliminary action by having the terminal device evaluate the time-domain positions and calculate remaining transmission times of uplink grant resources before selecting which resource to use. This advance evaluation ensures that sufficient time is available for data transmission while keeping the scheduling process relatively simple through clear selection rules based on time availability.
Data Source
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AI summary
This application provides a communication method, a communications apparatus, and a system, to reduce a transmission delay of an emergency service. The method includes: receiving an uplink grant; determining, based on a time-domain position of an uplink grant resource indicated by the uplink grant, a first uplink grant resource used to transmit first service data; and transmitting the first service data on the first uplink grant resource.