Adaptive Downlink Control Information Field Length for NR Scheduling
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Solution Overview
Problem
Current communication systems lack an effective method to indicate the number of scheduled time intervals for terminal devices in scenarios with multiple time interval scheduling, particularly in New Radio (NR) networks where different numerologies result in varying TTI durations, leading to inefficiencies in channel occupation and data transmission.
Innovation Solution
The proposed solution involves transmitting downlink control information with adaptive field lengths and granularities to indicate the number of scheduled time intervals, using formulas such as N=V*X0 and N=(V+1)*X1 when V≤M−1; N=M*X1+(V−M+1)*X2 when V>M−1, to accommodate different subcarrier spacings and numerologies, allowing for efficient multiple slot scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple time interval scheduling is adopted with different numerologies, then channel occupation efficiency is improved, but indicating the number of scheduled time intervals becomes complex due to varying TTI durations
Solution Approach 1:
The patent applies parameter changes by making the field length and granularity adaptive to the maximum number of scheduled time intervals. Specifically, the field length is determined based on the maximum number of time intervals across different numerologies, and the granularity is adjusted according to the subcarrier spacing. This allows a unified indication mechanism that works across different TTI durations without requiring separate indication fields for each numerology, thus improving channel occupation efficiency while controlling indication complexity.
Solution Approach 2:
The patent implements universality by designing a downlink control information structure that can indicate the number of scheduled time intervals for multiple numerologies using a single field. The field is configured to accommodate the maximum number of time intervals across all active numerologies, allowing it to serve as a universal indication mechanism for different subcarrier spacings and TTI durations, thereby simplifying the overall system complexity.
2Measurement precision
If adaptive field length is used to indicate scheduled time intervals, then indication accuracy is improved, but downlink control information processing complexity increases
Solution Approach 1:
The patent changes the parameter of field length to be adaptive rather than fixed. The field length is determined based on the maximum number of scheduled time intervals, which varies with the subcarrier spacing and numerology configuration. This adaptive approach ensures that the field length is sufficient to accurately indicate the number of time intervals for any active numerology, improving indication accuracy while avoiding excessive field lengths that would increase processing complexity.
Solution Approach 2:
The patent introduces dynamics by making the field length and granularity configurable rather than static. The network can configure the field length and granularity parameters according to the actual numerology settings and scheduling requirements. This dynamic configuration allows the system to optimize between indication accuracy and processing complexity based on current operational conditions.
Data Source
AI summary
A method and device for transmitting downlink control information. The method includes: transmitting downlink control information comprising one or more fields indicating the number of scheduled time intervals to a terminal device. Therefore, the number of scheduled time intervals could be indicated for a terminal device in case that multiple time interval scheduling is adopted.