Mini-Slot Data Transmission Avoiding Slot Boundaries
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Solution Overview
Problem
Current data transmission methods in 5G mobile communications systems, particularly for URLLC services, fail to meet the requirements of 99.999% reliability and latency less than 1 ms due to limitations in slot-level repetition, which does not support mini-slot-level data transmission effectively, leading to increased latency and reduced reliability.
Innovation Solution
A data transmission method that determines M mini-slot-level second time domain resources based on a first time domain resource, ensuring none of these resources cross a slot boundary, allowing for repeated data transmission at a mini-slot level, thereby reducing latency and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slot-level repeated data transmission is used, then data transmission reliability is improved, but data transmission latency increases
Solution Approach 1:
The patent segments the time domain resource from slot-level to mini-slot-level granularity. By dividing the transmission time into smaller mini-slots (which can be 2, 4, or 7 symbols instead of a full slot), the system enables more frequent retransmissions within the same time window, thereby reducing latency while maintaining reliability through increased transmission opportunities.
Solution Approach 2:
The patent performs preliminary configuration of mini-slot structures and determines M mini-slot-level time domain resources in advance based on the first time domain resource. This pre-planning allows the system to immediately execute repeated transmissions at mini-slot granularity without additional scheduling delays, thus reducing overall transmission latency.
2Loss of time
If mini-slot-level repeated data transmission is implemented, then data transmission latency is reduced, but system complexity increases
Solution Approach 1:
The patent changes the time domain resource granularity parameter from slot-level to mini-slot-level, and adjusts the repetition count parameter M. By modifying these parameters, the system achieves flexible control over transmission latency without fundamentally changing the underlying communication protocol structure, thus managing complexity while improving performance.
Solution Approach 2:
The patent introduces dynamic selection of M mini-slot-level time domain resources based on the first time domain resource. The system can dynamically determine the number and position of mini-slots for repeated transmission, allowing adaptive optimization of latency versus complexity trade-offs based on actual channel conditions and service requirements.
3Productivity
If time domain resources cross slot boundaries, then resource utilization is improved, but data transmission reliability deteriorates
Solution Approach 1:
The patent segments time domain resources and explicitly identifies slot boundaries. By determining M mini-slot-level resources and checking whether they cross slot boundaries, the system can segment transmissions that would cross boundaries into separate mini-slots within the same slot, thereby maintaining reliability while still achieving efficient resource utilization through mini-slot-level scheduling.
Solution Approach 2:
The patent applies different quality requirements to different parts of the time domain resource allocation. Mini-slots that would cross slot boundaries are treated differently (either excluded or adjusted) to maintain local reliability within each slot, while the overall system achieves high resource utilization through flexible mini-slot scheduling in valid regions.
Data Source
AI summary
This application provides a data transmission method and a communications apparatus. The method includes: first determining, based on a first time domain resource, M mini-slot-level second time domain resources that do not cross a slot boundary; and then performing repeated mini-slot-level data transmission on the M second time domain resources.