Uplink Power Headroom Reporting for Trigger-Based Wi-Fi Power Control
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Solution Overview
Problem
In wireless communication systems, especially in Wi-Fi Uplink Orthogonal Frequency Division Multiple Access (UL OFDMA) and Multi-User Multiple-Input Multiple-Output (MU-MIMO), the lack of visibility into client devices' uplink power headroom (UPH) by the access point (AP) leads to suboptimal power control, resulting in increased interference and degraded signal quality, particularly in Ultra High Reliability (UHR) communication scenarios.
Innovation Solution
Client devices report granular UPH information and limiting factors to the AP, allowing the AP to adjust power-related requirements such as target received signal strength indicator (RSSI) and transmit power levels dynamically, using mechanisms like separate management frames or embedded signaling in PPDU, to ensure efficient and reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP does not receive granular UPH information from client devices, then the communication overhead is reduced, but power control becomes suboptimal leading to increased interference and degraded signal quality
Solution Approach 1:
The patent implements a feedback mechanism where client devices report their uplink power headroom (UPH) information to the access point (AP). This feedback enables the AP to make informed power control decisions, adjusting target RSSI and transmit power levels dynamically based on actual client device power capabilities, thereby resolving the information asymmetry and improving signal quality through optimized power management
Solution Approach 2:
The patent introduces UPH reporting as an intermediary information exchange mechanism between client devices and the AP. This intermediary process allows the AP to indirectly assess client device power status without direct measurement, enabling sophisticated power control decisions while maintaining network coordination and avoiding interference through shared power state information
2Productivity
If the AP dynamically adjusts power-related requirements based on granular UPH information, then power management is optimized, but communication overhead and processing complexity increase
Solution Approach 1:
The patent applies preliminary action by having client devices report their UPH information before uplink transmissions occur. This advance information allows the AP to pre-calculate optimal target RSSI and power level settings, making power control decisions proactively rather than reactively, thereby improving power management efficiency while reducing real-time processing complexity during actual transmissions
Solution Approach 2:
The patent implements dynamics by enabling the AP to adjust power-related requirements dynamically based on reported UPH information. The system transitions from static power settings to adaptive power control, where target RSSI and transmit power levels are modified in response to changing client device power headroom conditions, optimizing power management efficiency while maintaining manageable processing complexity through structured adjustment mechanisms
3Illumination intensity
If client devices transmit at higher power levels without UPH reporting, then signal strength is improved, but interference increases and power constraints are violated
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmit power levels based on reported UPH information. Instead of using fixed high power levels, the system modifies the power parameter adaptively according to actual client device capabilities and network conditions, ensuring sufficient signal strength while preventing excessive power transmission that would cause interference and violate power constraints
Data Source
AI summary
The present disclosure provides techniques for reporting of granular information related to a station device's uplink power headroom (UPH) in trigger-based transmissions. A client device identifies one or more power limit reasons that constrain a maximum transmit power of the client device. The client device determines an UPH based on a difference between the maximum transmit power and a current transmit power of the client device. The client device transmits a message to an access point (AP), including the UPH and the one or more power limit reasons. Based on the received information, the AP determines a target RSSI for the client device. The client device receives the target RSSI and an AP transmit power level from the AP, and defines an uplink transmit power as a function of the AP transmit power level and the target RSSI.