Defer Signal for Prioritized WLAN Access
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Solution Overview
Problem
In wireless local area networks (WLANs), there is a challenge in efficiently managing resource usage and ensuring acceptable bandwidth and response times, especially when multiple devices with different communication protocols and hardware limitations share resources, and legacy devices need to coexist with newer protocols.
Innovation Solution
The implementation of a radio architecture that includes both WLAN and Bluetooth functionality, with a new Access Category (AC_PL) for prioritized access, utilizing a Defer Signal to manage contention periods and improve latency by allowing certain stations to immediately transmit a Defer Signal, thereby reducing collisions and increasing access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources using standard protocols, then device compatibility and coexistence are improved, but network efficiency and response times deteriorate due to increased collisions and contention
Solution Approach 1:
The patent applies preliminary action by having high-priority stations transmit a defer signal before their actual data transmission. This preliminary defer signal reserves the channel in advance, preventing other stations from attempting to access the channel during the high-priority transmission, thereby eliminating collisions before they can occur and improving overall network efficiency
2Ease of operation
If standard channel access protocols are used, then fairness among all devices is improved, but latency for time-sensitive transmissions worsens due to equal contention delays
Solution Approach 1:
The patent applies local quality by creating a special access category (AC_PL) with distinct properties for high-priority traffic. Stations with time-sensitive data can transmit defer signals immediately without waiting for standard contention procedures, while other stations continue to follow fair contention rules. This localized differentiation allows time-sensitive transmissions to bypass normal delays without compromising overall access fairness
3Adaptability or versatility
If legacy protocol compatibility is maintained, then backward compatibility is improved, but access efficiency for newer protocols worsens due to protocol overhead and contention
Solution Approach 1:
The patent introduces the defer signal as an intermediary mechanism that operates independently of specific protocol versions. This defer signal serves as a universal channel reservation indicator that both legacy and modern stations can recognize and respond to, allowing high-priority stations to efficiently reserve the channel without being constrained by legacy protocol limitations or overhead
Data Source
AI summary
Methods, apparatuses, and computer readable media for an access point (AP), where an apparatus of an AP comprises processing circuitry configured to: decode a first defer signal frame, determine the first defer signal frame is from a station (STA) associated with the AP, and encode, for transmission, in a subsequent contention period a second defer signal frame. The processing is further configured to: determine the first defer signal is from the STA associated with the AP based on one of: a basic service set (BSS) subfield in a physical (PHY) portion of the first signal frame, a transmitter address in a media access control (MAC) portion of the first defer signal frame, a receiver address in the MAC portion of the first defer signal frame, or a service field of the first signal field.