Terminal Frequency Signaling for TDD Scheduling Accuracy
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Solution Overview
Problem
In wireless communication systems operating in TDD mode, terminal devices need to switch between uplink and downlink carriers, but the base station is not aware of this frequency switching, leading to improper scheduling.
Innovation Solution
A communication method where a network device sends signaling to a terminal device to set its operating frequency based on an indicated frequency, ensuring the network device is aware of the terminal device's current operating frequency for proper scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device switches between uplink and downlink carriers to share one antenna for two frequency bands, then the device complexity is reduced, but the base station cannot perceive the frequency switching leading to improper scheduling
Solution Approach 1:
The terminal device sends feedback information to the base station indicating its current operating frequency. This feedback mechanism ensures the base station is aware of the terminal's frequency state, enabling proper scheduling decisions while maintaining the antenna sharing configuration that reduces device complexity.
Solution Approach 2:
The terminal device proactively notifies the base station of its frequency switching before scheduling conflicts occur. By performing this notification in advance, the base station can adjust its scheduling decisions to match the terminal's current operating frequency, preventing improper scheduling while maintaining the complex-reducing antenna sharing approach.
2Device complexity
If the terminal device does not notify the base station of frequency switching, then the communication protocol complexity is reduced, but the scheduling accuracy deteriorates
Solution Approach 1:
A lightweight feedback mechanism is introduced where the terminal device sends concise frequency status information to the base station. This minimal additional communication maintains protocol simplicity while significantly improving the base station's awareness of the terminal's operating frequency for accurate scheduling.
3Speed
If the base station schedules the terminal device without knowing the current operating frequency, then the scheduling speed is maintained, but the communication reliability deteriorates
Solution Approach 1:
The terminal device notifies the base station of its frequency state in advance before scheduling occurs. This preliminary notification ensures the base station has accurate frequency information ready when making scheduling decisions, maintaining fast scheduling speed while improving reliability through informed decision-making.
Data Source
AI summary
This application relates to a communication method, a communication apparatus, a terminal device, and a network device. In one example, the terminal device receives first signaling from the network device, where the first signaling indicates the terminal device to send a first uplink signal to the network device on a first uplink carrier, and the first signaling further indicates a first frequency. Further, the terminal device sets an operating frequency of the terminal device based on the first frequency after sending the first uplink signal on the first uplink carrier; or the terminal device sets an operating frequency of the terminal device based on the first frequency before an end moment of a time unit in which the first uplink signal is located.