Waveform-Specific PHR Reporting for Dynamic Uplink Scheduling
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Solution Overview
Problem
Existing communication technologies face challenges in efficiently managing power headroom reports (PHR) for dynamic waveform switching between OFDM and DFT-s-OFDM waveforms, leading to inaccurate scheduling decisions due to unknown maximum transmit power for unused waveforms, and excessive reporting overhead when channel status changes slowly.
Innovation Solution
A method for generating and transmitting power headroom reports (PHR) for unused waveforms based on modulation and coding scheme (MCS) or scheduled bandwidth, allowing network devices to accurately determine scheduling parameters for dynamic waveform switching, and triggering PHR reports only when necessary to reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PHR is reported for both used and unused waveforms to enable accurate scheduling decisions for dynamic waveform switching, then scheduling accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements dynamic PHR reporting by triggering reports only when waveform switching is needed or channel status changes occur. The network device dynamically controls PHR reporting based on current transmission conditions, switching between reporting unused waveform PHR and used waveform PHR as appropriate, thereby reducing unnecessary signaling overhead while maintaining scheduling accuracy when needed.
Solution Approach 2:
The patent changes the reporting parameter from static (always report both waveforms) to conditional (report based on waveform switching needs). By modifying the reporting trigger conditions and selecting which waveform's PHR to report based on current transmission state, the system achieves both accuracy and efficiency.
2Speed
If PHR is reported continuously to ensure real-time scheduling accuracy, then scheduling responsiveness is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous PHR reporting, the patent implements periodic or event-triggered reporting. The terminal device reports PHR for unused waveform only when specific conditions are met (e.g., waveform switching decision needed, channel status changes), thereby reducing energy consumption while maintaining scheduling responsiveness when actually needed.
Solution Approach 2:
The terminal device autonomously determines when PHR reporting is necessary based on local channel status and transmission conditions, without requiring continuous network commands. This self-triggered reporting mechanism reduces energy consumption by avoiding unnecessary reports while ensuring scheduling accuracy when needed.
3Device complexity
If maximum transmit power for unused waveform is unknown, then device complexity is reduced, but scheduling accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by having the terminal device calculate and report PHR for unused waveform in advance, before the actual waveform switching occurs. The terminal device pre-computes the PHR value based on current channel status and transmission parameters, so that when scheduling decision is needed, the accurate PHR information is already available, eliminating the need for complex real-time power calculations.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device generates a PHR for a first waveform based on at least one of a MCS or a scheduled bandwidth for an uplink transmission, the uplink transmission being performed by using a second waveform different from the first waveform; and transmits the PHR to a network device. In this way, a PHR for an unused waveform may be reported.