Orthogonal TWT Scheduling Across Multiple WLAN Links

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Solution Overview

Problem

Existing communication systems in artificial reality environments experience interference and latency issues, leading to judder and motion sickness due to non-prioritized latency-sensitive traffic, which degrades the user experience.

Innovation Solution

Implementing a system that coordinates multiple communication links using Target Wake Time (TWT) schedules to orthogonalize intralink and interlink traffic, allowing for separate and non-overlapping communication periods, thereby reducing interference and ensuring timely image rendering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple communication links are used for artificial reality traffic, then communication capacity and functionality are improved, but interference between intralink and interlink traffic increases

Engineering Contradiction:

Improvecommunication capacityVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The communication system is segmented into two distinct TWT schedules: one for intralink traffic (between HWD and console) and another for interlink traffic (between AP and HWD). This segmentation allows each link type to operate in dedicated time slots, eliminating interference while maintaining both communication channels for enhanced functionality and capacity.

Inventive Principle:

Principle #1Segmentation

2Loss of time

If TWT schedules are implemented for multiple links, then latency is reduced and communication timing is coordinated, but device complexity increases

Engineering Contradiction:

ImprovelatencyVSAvoidcoordination complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The HWD acts as an intermediary that receives a single TWT schedule from the AP and autonomously generates multiple child TWT schedules for different communication links. This intermediary approach simplifies the overall system by centralizing coordination at the HWD, reducing latency through automated schedule generation while avoiding the complexity of multi-device coordination protocols.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If separate TWT schedules are configured for intralink and interlink traffic, then interference is reduced, but frame overhead and signaling complexity increase

Engineering Contradiction:

ImproveinterferenceVSAvoidframe overhead

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Multiple TWT schedule requests are merged into a single frame exchange between the AP and HWD. The HWD includes multiple TWT request elements in one action frame, and the AP responds with a single action confirmation frame containing multiple TWT element information. This merging approach reduces frame overhead and signaling complexity while still configuring separate TWT schedules for different traffic types to eliminate interference.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12581408B2Systems and methods of orthogonal radio sharing across multiple links

Publication Date: 2026.03.17 META PLATFORMS TECHNOLOGIES LLC

AI summary

A first device may include one or more processors. The one or more processors may generate one or more request frames including a request for a first target wake time (TWT) schedule and a second TWT schedule. The one or more processors may wirelessly transmit, via a transmitter over a wireless local area network (WLAN), the generated one or more request frames to an access point (AP). In response to receiving from the AP one or more response frames accepting the request, the one or more processors may communicate (i) with the AP during a service period (SP) of the first TWT schedule and (ii) with a second device during an SP of the second TWT schedule.