Uplink Control Channel Timing for Accurate Power Headroom Reporting
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Solution Overview
Problem
In wireless communications systems, the alignment of control and data channels across different component carriers complicates the determination of power headroom, leading to inefficiencies in uplink resource allocation and transmission rates due to uncertainties in monitoring control channels for power headroom reporting.
Innovation Solution
The terminal device determines a first uplink data transmission moment and duration, monitoring control channels based on this moment to accurately calculate and report power headroom, while the network device skips sending control channels to synchronize the reporting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device continuously monitors control channels to ensure accurate power headroom reporting, then the reliability of PHR is improved, but the power consumption and complexity increase
Solution Approach 1:
The terminal device determines the first moment (which is before the first uplink data transmission moment) in advance based on the first duration. This preliminary determination of the monitoring deadline allows the device to stop monitoring control channels at the first moment, avoiding continuous monitoring and reducing power consumption and complexity while ensuring accurate PHR reporting.
2Productivity
If the terminal device monitors control channels for a longer duration to capture all scheduling opportunities, then the uplink resource allocation efficiency is improved, but the time required for PHR calculation increases
Solution Approach 1:
The first moment is determined in advance as a deadline for control channel monitoring, calculated based on the first uplink data transmission moment and the first duration. This allows the terminal device to perform PHR calculation efficiently by only monitoring control channels until this predetermined moment, rather than continuously monitoring, thus reducing the time loss for PHR calculation while maintaining resource allocation efficiency.
3Adaptability or versatility
If the network device sends control channels frequently to maintain scheduling flexibility, then the adaptability of uplink scheduling is improved, but the synchronization difficulty with PHR reporting increases
Solution Approach 1:
The first duration acts as an intermediary parameter that mediates between the network device's scheduling flexibility and the terminal device's PHR reporting timing. The network device can send control channels freely, but the terminal device uses the first duration to determine when to stop monitoring and perform PHR reporting, thus decoupling the scheduling flexibility from the reporting synchronization complexity.
Data Source
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AI summary
This application provides a communication method and an apparatus. The communication method includes: after determining a first uplink data transmission moment and a first duration, determining, by a terminal device, a first moment based on the first uplink data transmission moment and the first duration, and monitoring a control channel based on the first moment. In this way, the terminal device may send a PHR to a network device based on the control channel detected through monitoring at the first moment, so that efficiency of feeding back the PHR by the terminal device can be effectively improved.