Wi-Fi Packet Duration Control for In-Device Coexistence
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Solution Overview
Problem
In artificial reality environments, such as virtual, augmented, or mixed reality, wireless devices face challenges in avoiding collisions between Wi-Fi and other radio traffic due to asynchronous transmission patterns, leading to interference and poor user experience.
Innovation Solution
The implementation of configurable Wi-Fi Physical Layer Protocol Data Unit (PPDU)/Short Interframe Space (SIFS) bursting durations in both uplink and downlink MAC layers to manage packet transmissions and prevent back-to-back collisions, using control IDs in the Aggregated Control subfield of the High Efficiency (HE) variant High Throughput (HT) Control field, and controlling Block Ack window sizes to adjust packet durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Wi-Fi and other radios transmit asynchronously to maintain independent operation, then device functionality and adaptability are improved, but collision between transmissions increases causing interference
Solution Approach 1:
The patent implements periodic transmission patterns for Wi-Fi and other radios by configuring specific packet durations and inter-frame gaps. The Wi-Fi radio transmits packets with controlled durations followed by mandatory gaps, creating periodic transmission cycles that prevent continuous collision with other radios while maintaining independent operation of each radio interface.
Solution Approach 2:
The system dynamically adjusts transmission parameters including packet duration, inter-frame gaps, and transmission windows based on traffic conditions and coexistence requirements. The MAC layer configures variable PPDU durations and SIFS bursting durations that can adapt to different traffic loads, allowing the system to maintain optimal performance while avoiding collisions.
2Productivity
If packet transmission duration is increased to improve throughput, then productivity is improved, but collision probability with other radios increases
Solution Approach 1:
The patent changes key transmission parameters including PPDU duration, SIFS bursting duration, and inter-frame gap values to optimize the balance between throughput and collision avoidance. By configuring maximum PPDU durations and controlling the number of SIFS intervals between packets, the system adjusts transmission characteristics to maintain high productivity while reducing collision probability with other asynchronous radios.
3Productivity
If inter-frame gap is decreased to improve transmission efficiency, then productivity is improved, but reliability of avoiding collision with other radios deteriorates
Solution Approach 1:
The system performs preliminary configuration of inter-frame gaps and transmission windows before actual data transmission begins. The MAC layer pre-calculates and sets appropriate SIFS durations and inter-frame gaps based on expected traffic patterns and coexistence requirements, ensuring that transmission efficiency is optimized while collision avoidance reliability is maintained from the start of communication.
Data Source
AI summary
A first device may one or more processors. The one or more processors may be configured to monitor wireless receive (Rx) traffic to a second device. The one or more processors may be configured to generate, based on the wireless Rx traffic, control information to control wireless transmit (Tx) traffic from the first device to avoid collision between the wireless Rx traffic and the wireless Tx traffic, the control information including at least one of a maximum Tx frame duration or a minimum Tx inter-frame gap. The one or more processors may be configured to wirelessly transmit, via a transceiver based on the control information, the wireless Tx traffic in a wireless local area network (WLAN).