Subframe Scheduling Method Reducing Control Signalling Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE/LTE-A systems, dynamic scheduling results in high control signalling overheads and resource occupation, while semi-static scheduling lacks flexibility, especially in scenarios like Small Cell and multi-user, multi-packet services, where control channel capacity is a limiting factor.
Innovation Solution
A subframe scheduling method that differentiates between single-subframe and multi-subframe scheduling through DCI formats or search spaces, allowing for flexible configuration of scheduling parameters and ACK/NACK feedback across multiple subframes, reducing control signalling overheads and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is adopted, then scheduling flexibility is improved, but control signalling overhead increases
Solution Approach 1:
The patent merges multiple subframe scheduling operations into a single DCI message. Instead of sending separate DCI for each subframe, the system combines scheduling information for multiple subframes (including new data and retransmissions) into one control message, thereby reducing control signalling overhead while maintaining scheduling flexibility through the bundled multi-subframe grants.
2Quantity of substance
If semi-static scheduling is used, then control signalling overhead is reduced, but scheduling flexibility deteriorates
Solution Approach 1:
The patent introduces dynamic elements into semi-static scheduling by enabling the DCI to indicate different transmission types (new data vs. retransmission) and configure multiple subframes dynamically. The system allows flexible adjustment of scheduling parameters within the multi-subframe structure, making the scheduling adaptable to changing channel conditions and traffic requirements while maintaining reduced signalling overhead.
3Reliability
If Transmission Time Interval bundling is adopted, then uplink transmission reliability is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent segments the TTI bundling approach by allowing selective application to different subframes within the bundled group. Instead of treating all subframes uniformly, the system can identify and handle retransmission subframes separately, enabling more efficient resource allocation and improving spectrum efficiency while maintaining the reliability benefits of bundling for critical transmissions.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
Disclosed is a subframe scheduling method, which includes: a network side configures a transmission mode, wherein the transmission mode includes at least a multi-subframe scheduling transmission way; the network side selects a corresponding control information format according to the transmission mode, transmits Downlink Control Information (DCI) corresponding to the control information format, and then performs subframe scheduling according to the DCI. Further disclosed are a subframe scheduling system, a network device and a terminal. By means of the disclosure, the multi-subframe scheduling can be used under the condition in which user channel state information is relatively stable, thereby being able to reduce control signalling overheads, save system resources and improve the scheduling flexibility.