DCI Scheduling in Subframe Time Units
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Solution Overview
Problem
Current PDCCHs in LTE systems face a significant delay when scheduling data packets with a transmission time interval (TTI) less than 1 ms, as they require data to be scheduled in the next subframe, leading to inefficiencies in data transmission.
Innovation Solution
The method involves determining a first channel resource within each time unit of a subframe, allowing for immediate data transmission without waiting for the next subframe, by locating the channel resource in specific time units within the subframe, thereby reducing scheduling delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If current PDCCHs are used to schedule data packets, then scheduling information can be transmitted to the terminal device, but the scheduling delay becomes relatively long when TTI duration is less than 1 ms
Solution Approach 1:
The subframe is divided into multiple time units, each capable of carrying PDCCH independently. This segmentation allows scheduling decisions to be made at finer time granularity (e.g., every 0.5ms or 0.2ms instead of waiting for the next 1ms subframe boundary), directly reducing scheduling delay while maintaining system productivity
Solution Approach 2:
PDCCH resources are pre-configured and distributed across multiple time units within the subframe. When scheduling is needed, the base station can immediately utilize the next available time unit's PDCCH resource without waiting for subframe boundary alignment, enabling preliminary scheduling action that reduces delay while preserving transmission efficiency
Data Source
Figure 1~2A
Figure 2B~2C
Figure 2D
AI summary
A DCI sending method and an apparatus are provided. A base station determines a first channel resource, where the first channel resource is located in the ith time unit of a subframe in a time domain, the subframe includes NT time units, NT is an integer greater than or equal to 2, and i is a positive integer less than or equal to NT ; and the base station sends DCI to a terminal device on the first channel resource. In this solution, the first channel resource that carries the DCI is located in the ith time unit of the subframe in the time domain, where i is a positive integer less than or equal to NT. That is, there is a first channel resource in each time unit of the subframe. Therefore, when data needs to be transmitted in any time unit, the data can be transmitted immediately, instead of waiting until a next subframe. This reduces a scheduling delay.