Asynchronous Channel Access Control for XR Latency
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in ensuring low-latency and high-throughput communication for applications like gaming and extended reality (XR), as existing systems often violate latency and packet loss requirements due to inefficient medium access control.
Innovation Solution
Implementing asynchronous channel access control methods that prioritize physical layer protocol data units (PPDUs) for XR traffic, using different priority settings for transmitting data and adjusting backoff counters or EDCA parameters to ensure control of the wireless medium, while allowing other devices to access the medium in scenarios like target wake time (TWT) sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If asynchronous channel access control is implemented with priority settings for XR traffic, then latency requirements are met, but device complexity increases
Solution Approach 1:
The patent changes the priority parameter of PPDUs based on traffic type, assigning high priority to XR traffic and low priority to other traffic. This parameter change enables differentiated channel access control, ensuring low latency for XR applications while allowing other devices to access the medium during low-priority periods, thus resolving the contradiction between latency requirements and device complexity
Solution Approach 2:
The system dynamically adjusts the priority of PPDUs based on the type of traffic being transmitted. XR traffic receives high priority dynamically, while other traffic is assigned low priority. This dynamic priority adjustment allows the system to meet latency requirements for time-sensitive applications without permanently increasing device complexity for all traffic types
2Loss of time
If high priority is assigned to XR traffic transmission, then latency requirements are met, but other devices have reduced access to the wireless medium
Solution Approach 1:
The patent implements periodic priority adjustment where XR traffic receives high priority during its transmission periods, while other devices are granted access during low-priority periods. This periodic alternation between high and low priority states ensures that XR latency requirements are met while other devices maintain periodic access to the wireless medium, resolving the contradiction between latency performance and medium access versatility
3Productivity
If backoff counters are adjusted for priority-based access, then channel access control is improved, but system complexity increases
Solution Approach 1:
The patent changes the backoff counter parameter based on PPDU priority. High-priority XR traffic uses a first backoff counter value that allows faster medium access, while low-priority traffic uses a second backoff counter value that delays access. This parameter change improves channel access efficiency for XR traffic without requiring complex additional control mechanisms, as the backoff counter adjustment is integrated into the existing EDCA framework
Data Source
AI summary
This disclosure provides systems, methods and apparatus for asynchronous channel access control of a wireless system. In some aspects, a device may adjust the priority of one or more PPDUs and may perform other operations to ensure control of a wireless medium at certain times while still allowing for other devices to communicate on the wireless medium. For example, the device may adjust a backoff counter or one or more EDCA parameters to ensure obtaining control of the wireless medium to transmit a first PPDU of an application file. For one or more subsequent PPDUs of the application file, the device may again adjust a backoff counter or one or more EDCA parameters to allow other devices to obtain control of the wireless medium in certain scenarios (such as a second device to provide information back to the device or to otherwise transmit using the shared wireless medium).