Repetition Transmission Across Duplex Slots for Lower Latency
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Solution Overview
Problem
The challenge in next-generation radio (NR) systems is determining the optimal repetition transmission positions for channels to enhance transmission reliability and reduce latency, particularly in scenarios involving half-duplex and full-duplex slots.
Innovation Solution
A method and apparatus that allow for the use of both half-duplex and full-duplex slots together for repetition transmission by employing indication information, such as bitmaps and offset/quantity information, to determine optimal transmission locations based on time domain positions, thereby reducing latency and scheduling complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetition transmission is performed only in full-duplex slots, then transmission reliability is improved, but transmission latency increases and resource utilization decreases
Solution Approach 1:
The patent segments the slot structure into full-duplex slots and half-duplex slots, allowing repetition transmissions to be distributed across both types of slots. This segmentation enables the system to achieve reliable transmission through multiple repetitions while reducing latency by utilizing available half-duplex slot resources that would otherwise be idle for repetition purposes.
Solution Approach 2:
The patent introduces dynamic slot configuration where the network can flexibly indicate through indication information whether half-duplex slots should be used for repetition transmissions. This dynamic approach allows the system to adapt to varying channel conditions and traffic requirements, optimizing both reliability and latency performance by selectively utilizing half-duplex slots when appropriate.
2Productivity
If half-duplex slots are used for repetition transmission, then latency is reduced and resource utilization improves, but system complexity increases due to coordination requirements
Solution Approach 1:
The patent introduces indication information as an intermediary mechanism that simplifies the coordination between full-duplex and half-duplex slots. The network device sends indication information to the terminal device, clearly specifying which half-duplex slots can be used for repetition transmissions. This intermediary signaling approach reduces scheduling complexity by providing explicit guidance rather than requiring complex real-time coordination protocols.
Solution Approach 2:
The patent employs preliminary configuration where the network device pre-indicates which half-duplex slots are available for repetition transmissions before the actual transmissions occur. This preliminary action allows terminal devices to prepare and execute repetition transmissions in half-duplex slots without introducing additional scheduling complexity during the transmission process, thereby improving resource utilization while maintaining manageable system complexity.
3Ease of operation
If repetition transmission positions are restricted to full-duplex slots only, then scheduling simplicity is maintained, but transmission latency increases
Solution Approach 1:
The patent segments the transmission resource pool into full-duplex slots and half-duplex slots with different scheduling rules. Full-duplex slots maintain simple scheduling for initial transmissions, while half-duplex slots are specifically designated for repetition transmissions through indication information. This segmentation allows the system to preserve scheduling simplicity for control channels while enabling low-latency repetition transmissions in data channels.
Solution Approach 2:
The patent introduces dynamic slot type indication that allows the system to flexibly determine whether half-duplex slots should be used for repetition transmissions based on current system conditions. This dynamic approach maintains scheduling simplicity by providing clear indication information while enabling reduced latency through selective utilization of half-duplex slots for repetition purposes when latency reduction is beneficial.
Data Source
AI summary
Embodiments of this application provide a terminal device that receives first indication information from a network device, where the first indication information indicates whether a half-duplex slot and a full-duplex slot are allowed to be used together for repetition transmission. Further, the terminal device determines at least one repetition transmission position of a first channel based on the first indication information and a time domain position at which the first channel is repeatedly transmitted for the first time, and sends or receives the first channel at the at least one repetition transmission position.