5G Data Transmission Resource Postponement for URLLC Reliability
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Solution Overview
Problem
Existing 5G mobile communication systems face challenges in reducing data transmission latency and improving reliability for ultra-reliable and low-latency communication (URLLC) services, particularly in scenarios where configured grants or semi-persistent scheduling resources become unavailable.
Innovation Solution
The terminal device postpones data transmission from an unavailable time-frequency resource to a subsequent resource by using predefined postponement rules or indication information, allowing for flexible resource configuration and real-time adjustments to maintain data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is postponed from an unavailable time-frequency resource to a subsequent resource, then data transmission reliability is improved, but data transmission latency increases
Solution Approach 1:
The terminal device performs preliminary detection to determine whether the first time-frequency resource is available before transmission. When unavailable, it proactively identifies and prepares the second time-frequency resource in advance, preventing transmission failures before they occur and reducing the need for reactive retransmissions that would increase latency.
Solution Approach 2:
The system dynamically adjusts the time-frequency resource allocation based on real-time availability. The terminal device can flexibly switch from the original scheduled resource to an alternative resource when conditions change, optimizing the balance between reliability and latency according to actual channel conditions and resource availability.
2Loss of information
If the terminal device autonomously determines the second time-frequency resource using postponement rules, then signaling overhead is reduced, but resource configuration flexibility is limited
Solution Approach 1:
The resource selection mechanism is segmented into two parts: autonomous selection using predefined postponement rules for common scenarios, and network-configured options for specialized cases. This segmentation allows the system to use simple autonomous rules most of the time (reducing signaling) while maintaining the capability to apply complex network-configured rules when needed (preserving flexibility).
Solution Approach 2:
The postponement rule mechanism serves multiple functions: it provides autonomous resource selection, defines selection criteria, and can be supplemented by network configuration. This multi-functionality allows a single mechanism to address both signaling overhead reduction and resource configuration flexibility requirements.
3Adaptability or versatility
If the network device provides indication information for the second time-frequency resource, then resource configuration flexibility is improved, but signaling overhead increases
Solution Approach 1:
Network indication information is provided selectively rather than universally. The network device sends resource indication information only when specific conditions are met (e.g., when autonomous postponement rules are insufficient or when special resource allocation is needed), keeping signaling overhead low for common cases while providing flexibility when required.
4Measurement precision
If the terminal device waits for network indication before using alternative resources, then resource allocation accuracy is improved, but data transmission latency increases
Solution Approach 1:
The terminal device performs preliminary autonomous resource selection using predefined postponement rules immediately when the first resource becomes unavailable, without waiting for network indication. This preliminary action reduces latency by initiating resource switching immediately, while the network can later provide indication information to refine or confirm the resource allocation for improved accuracy.
Data Source
AI summary
A data transmission method and an apparatus are provided. When a time-frequency resource used by a terminal device for data transmission is unavailable, the terminal device postpones, based on indication information of a network device and/or according to a postponement rule, the data transmission to a time-frequency resource closest to the time-frequency resource. Therefore, a data transmission latency is reduced.