Control Channel Scheduling for Reduced Overhead in LTE
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Solution Overview
Problem
In existing LTE systems, the overheads of control information required to indicate data channel time-frequency resources are excessively large due to irregular time-frequency resource allocation for control and data channels, leading to inefficient resource utilization.
Innovation Solution
A method where a base station determines the time period for the end of a control channel within a transmission time interval (TTI) and schedules the corresponding data channel in a subsequent TTI, ensuring regular time-frequency resource division and reducing control information overheads by specifying the start moment of the data channel based on the control channel's end moment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control channel and data channel time-frequency resources are allocated irregularly, then the system can accommodate different delay requirements of different UEs, but the overheads of control information required to indicate data channel time-frequency resources become excessively large
Solution Approach 1:
The TTI is divided into multiple time periods, with each time period corresponding to a specific data channel start moment. This segmentation allows the control channel to indicate different TTIs based on which time period it occupies, thereby reducing the control information overhead while maintaining adaptability to different delay requirements.
Solution Approach 2:
Different time periods within the TTI are assigned different characteristics corresponding to different data channel start moments. By placing the control channel in specific time periods, the system can locally indicate different TTI offsets, achieving both adaptability and reduced overhead.
2Reliability
If control channel occupies entire system bandwidth, then coverage is improved, but resource utilization efficiency decreases due to excessive control information overhead
Solution Approach 1:
The control channel is divided into multiple segments corresponding to different time periods, each segment occupying only the frequency resources needed for that specific time period. This reduces the total control information overhead while maintaining coverage through distributed time-frequency allocation.
3Adaptability or versatility
If data channel resource indication is made flexible to accommodate irregular time-frequency allocation, then adaptability improves, but control information overhead increases
Solution Approach 1:
The control information uses time period indicators as parameters to indicate different data channel start moments. By changing the parameter representation from explicit TTI offset values to time period indices, the system achieves flexibility with reduced overhead.
Data Source
AI summary
Method is provided, including: determining, by a base station, a current time period in which an end moment of a current control channel is located in a first transmission time interval (TTI), where the first TTI includes at least two time periods, and a start moment of a data channel corresponding to a control channel that ends in each of the at least two time periods is located in a different TTI; sending, by the base station to user equipment in the first TTI, control information carried on the current control channel, where the control information is configured to schedule a current data channel corresponding to the current control channel; determining, by the base station, a second TTI in which a start moment of the current data channel is located; and exchanging, by the base station, data of the current data channel with the user equipment in the second TTI.