Uplink Carrier Switching for Cross Modulation Interference
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Solution Overview
Problem
Current communication technologies lack a method to efficiently switch an uplink carrier from a first carrier to a second carrier to improve uplink communication performance, especially when the channel quality of the first carrier is poor, due to limitations such as cross modulation interference and terminal device capabilities.
Innovation Solution
A method and apparatus for determining and switching between uplink carriers of different frequencies, where the terminal device receives indication information from the network device to adjust its working state on one carrier from capable to incapable and vice versa, allowing it to select a carrier that supports signal transmission, thereby avoiding cross modulation interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device sends uplink signals on multiple uplink carriers of different frequencies simultaneously, then the uplink communication capacity is improved, but cross modulation interference occurs and terminal device capability limitations are exceeded
Solution Approach 1:
The patent implements carrier switching by periodically alternating between different uplink carriers based on channel quality conditions. The terminal device monitors channel quality indicators (CQI) and switches carriers in response to changing conditions, effectively using periodic assessment and action to maintain optimal uplink communication without simultaneous multi-carrier transmission that causes interference.
2Object-affected harmful factors
If the terminal device uses only one uplink carrier at a time, then cross modulation interference is avoided, but uplink communication performance cannot be optimized based on channel conditions
Solution Approach 1:
The patent implements dynamic carrier selection where the terminal device switches between different uplink carriers based on real-time channel quality conditions. The system dynamically adjusts which carrier is active by monitoring CQI values and switching when conditions change, allowing optimal uplink performance without the interference problems of simultaneous multi-carrier operation.
3Productivity
If the terminal device switches from a high frequency carrier to a low frequency carrier to improve channel quality, then uplink communication performance is improved, but no technical solution currently exists to implement this switching
Solution Approach 1:
The patent implements carrier switching through a feedback mechanism where the terminal device monitors channel quality indicators (CQI) for different carriers and provides feedback to the network device. Based on this feedback about channel conditions, the network device determines when switching is beneficial and provides control information to the terminal device to execute the carrier switch, enabling performance optimization with controlled complexity.
Data Source
AI summary
In various embodiments, a first carrier and a second carrier occupying different frequencies can be determined by a terminal device. A working state on the first carrier and a working state on the second carrier can be determined by the terminal device as a first working state, and a second working state, respectively. The first working state indicates the terminal device is capable of sending a first signal including at least one of an uplink data signal and an uplink control signal, and the second working state indicates the terminal device is incapable of sending the first signal. First indication information can be received by the terminal device from a network device. Based on the first indication information, the terminal device can determine that the working state on the first carrier is the second working state, and the working state on the second carrier is the first working state.