Wireless Medium Prioritized Access for Predictable QoS Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing contention for wireless medium access, leading to unpredictable latency and throughput, particularly for devices requiring high Quality of Service (QoS) with stringent latency requirements.
Innovation Solution
Implementing a high-priority contention mechanism that prioritizes access to the wireless medium, reducing collisions and improving predictability by coordinating channel access among devices, especially for Ultra High Reliability (UHR) STAs, without relying on Enhanced Distributed Channel Access (EDCA) and with inter-AP coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EDCA and UL MU techniques are used for wireless medium access, then basic communication functionality is maintained, but latency and throughput become unpredictable for high QoS requirements
Solution Approach 1:
The patent segments wireless medium access into two distinct mechanisms: standard EDCA for general traffic and a new prioritized access mechanism for high-priority UHR STAs. This segmentation allows UHR STAs to access the medium through a dedicated contention-free path, eliminating the unpredictability caused by standard EDCA collisions while maintaining backward compatibility for other devices.
Solution Approach 2:
The patent introduces APs as intermediaries that coordinate prioritized access for UHR STAs. The AP receives indication information from UHR STAs about their access needs and manages the contention process, acting as a mediator that eliminates direct collisions between UHR STAs and other devices, thereby ensuring predictable latency and throughput.
2Adaptability or versatility
If standard contention-based access is used, then all devices can access the medium, but collisions occur leading to reduced efficiency
Solution Approach 1:
The patent applies local quality by providing different access characteristics to different devices based on their QoS requirements. UHR STAs receive prioritized access with guaranteed performance through the new mechanism, while other devices continue using standard EDCA. This localized differentiation resolves the contradiction by optimizing efficiency for critical devices without sacrificing overall system compatibility.
3Reliability
If prioritized access coordination is implemented, then collision reduction is achieved, but system complexity increases
Solution Approach 1:
The patent extracts the prioritized access functionality from the standard EDCA framework into a separate, dedicated mechanism. By taking out the high-priority access requirements and handling them through a distinct contention process involving AP coordination, the system reduces collisions for UHR STAs while keeping the complexity isolated to specific components rather than affecting the entire system.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
For example, an Access Point (AP) may be configured to transmit a frame including a prioritized-access enabled/disabled field to indicate whether a prioritized-access contention mechanism is to be enabled or disabled over a wireless medium. For example, the prioritized-access contention mechanism may be configured to allow a prioritized station (STA) to transmit a reservation signal over the wireless medium at a reservation signal transmission time, and to contend the wireless medium according to a high-priority contention policy to obtain a Transmit Opportunity (TxOP) after transmission of the reservation signal. For example, the reservation signal transmission time may be based on an end of a predefined time duration from a start of a contention period. For example, the reservation signal may be configured to indicate a busy Clear Channel Assessment (CCA) to a receiving STA.