Uplink Location Measurement Feedback Scheduling via Availability Windows
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Solution Overview
Problem
In wireless communication systems, particularly in IEEE 802.11az, there is a challenge in efficiently managing uplink location measurement report (LMR) feedback due to varying computation capabilities among station devices, leading to inefficient resource allocation and power consumption, as access points need to manage different processing latencies and scheduling for multiple users.
Innovation Solution
The introduction of a mechanism that allows access points to schedule uplink LMR feedback based on the availability window negotiation, using a single bit in the ranging parameters field to indicate when each station's LMR is ready, enabling immediate or delayed feedback, and allowing stations to decide on power-saving states, thus optimizing resource allocation and reducing the need for separate timers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If access points manage separate timers for each station device with different processing latencies, then scheduling accuracy for uplink LMR feedback is improved, but device complexity and implementation overhead increase
Solution Approach 1:
The patent merges multiple separate timers into a single unified timer that serves all station devices. The access point uses one timer to track the availability window for receiving uplink LMR feedback from multiple STAs, eliminating the need for individual timers per STA. This reduces implementation complexity while maintaining scheduling accuracy through the standardized availability window mechanism defined in the negotiation phase.
Solution Approach 2:
The availability window mechanism serves multiple functions simultaneously: it coordinates uplink LMR feedback timing, manages power saving states, and handles resource allocation for multiple STAs with different computation capabilities. This universal mechanism replaces multiple specialized timers, reducing overhead while maintaining precise scheduling control.
2Loss of time
If station devices remain in active state to provide immediate LMR feedback, then feedback latency is reduced, but power consumption increases
Solution Approach 1:
The patent implements periodic availability windows during which STAs wake up to provide LMR feedback. Instead of remaining continuously active, STAs enter doze state and wake up at scheduled intervals defined by the availability window timing. This periodic operation reduces power consumption while maintaining acceptable feedback latency by ensuring STAs are awake at predetermined times to transmit their reports.
3Productivity
If access points allocate uplink resources based on immediate LMR availability, then resource allocation efficiency is improved, but the system cannot accommodate stations with different computation capabilities
Solution Approach 1:
The patent implements a dynamic scheduling mechanism where the availability window timing and uplink resource allocation are adapted based on each STA's computation capability. During the negotiation phase, STAs indicate their readiness status, and the access point dynamically adjusts the availability window schedule and resource allocation accordingly. This allows the system to accommodate varying computation speeds while maintaining efficient resource utilization through flexible, capability-aware scheduling.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to uplink location measurement report (LMR) feedback. A device may perform availability window negotiation during a negotiation phase of a location determination associated with a first initiating device of one or more initiating devices. The device may determine a status of a first LMR associated with the first initiating device. The device may cause to send a polling request to one more initiating devices during a first availability window. The device may identify a polling response from at least one of the one or more initiating devices. The device may perform one or more sounding measurements with the at least one of the one or more initiating devices during a measurement phase. The device may cause to send a trigger frame to the at least one of the one or more initiating devices.