Wi-Fi P2P Ranging Station Power Save via Non-Trigger Renegotiation
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Solution Overview
Problem
Existing Wi-Fi Peer-to-Peer (P2P) devices face challenges in power conservation during Proximity Ranging operations due to the lack of a protected legacy Fine Timing Measurement (FTM) operation and limited on-channel availability, which is crucial for reducing power consumption and enabling internet connectivity and service provision.
Innovation Solution
Implementing unsolicited FTM session renegotiation through modified Non-Trigger Based (NTB) scheduling control parameters, allowing devices to manage the duty cycle and measurement rate without role changes, using unsolicited FTM Response frames with FTM Ranging Parameters and NTB Specific Parameters, carried in aggregated A-MPDU or Vendor Specific Information Elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Wi-Fi P2P devices perform continuous Fine Timing Measurement (FTM) operations for proximity ranging, then measurement accuracy and ranging functionality are improved, but power consumption increases
Solution Approach 1:
The patent implements periodic FTM measurements instead of continuous measurements. The system establishes FTM sessions that occur at scheduled intervals, allowing the radio to enter low-power states between measurements. This periodic approach maintains ranging functionality while significantly reducing average power consumption compared to continuous operation.
Solution Approach 2:
The patent enables unsolicited FTM response frames where the responding station autonomously initiates measurement sessions without requiring continuous triggering from the initiating station. This self-service mechanism allows the responding device to manage its own measurement schedule, reducing the need for continuous active participation from both devices and thereby lowering overall power consumption.
2Use of energy by moving object
If Wi-Fi P2P devices implement protected legacy FTM operation with role changes, then power save operation is improved, but device complexity and operational flexibility deteriorate
Solution Approach 1:
The patent enables a station to function as both an initiating station and a responding station in different FTM sessions. Instead of assigning fixed roles, any station can autonomously initiate FTM sessions or respond to others' sessions. This multi-functionality simplifies the system by eliminating the need for complex role management and negotiation protocols, while still achieving power save operations through unsolicited responses.
3Measurement precision
If Wi-Fi P2P devices increase on-channel availability for FTM operations, then ranging measurement accuracy is improved, but power consumption and loss of connectivity opportunities increase
Solution Approach 1:
The patent implements dynamic FTM session management where measurement intervals and session frequencies are adjusted based on actual ranging needs and power constraints. Rather than maintaining fixed high availability, the system dynamically scales measurement activity, allowing higher accuracy when needed and lower consumption when ranging updates are less critical. This dynamic approach balances measurement precision with power efficiency.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to Efficient Ranging Optimization. Wi-Fi peer-to-peer devices may exchange null data packets as part of a fine timing measurement procedure for device ranging operations without requiring a trigger frame to initiate the exchange, and may renegotiate the timing when the devices are to be available for subsequent exchanges for device ranging operations.