AP-Assisted High-Priority EDCA for Low-Latency TXOP Access
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Solution Overview
Problem
Current wireless networks struggle to efficiently manage low-latency traffic (LLT) within transmission opportunities (TXOP), leading to channel access delays and increased latency, particularly in congested environments where real-time applications require low latency and high reliability.
Innovation Solution
Implementing high priority enhanced distributed channel access (EDCA) mechanisms with access point (AP) participation, including the exchange of defer signals (DS) to manage and prioritize low-latency traffic, allowing for quick TXOPs to ensure timely transmission of LLT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional EDCA is used for channel access, then the system is simple and easy to operate, but channel access delays and latency increase significantly in congested environments
Solution Approach 1:
The patent segments the EDCA contention process into distinct phases: a first contention period where STAs transmit defer signals (DS) indicating LLT availability, and a second contention period where the AP transmits DS indicating its own LLT. This segmentation allows low-latency traffic to be identified and prioritized separately from regular traffic, reducing channel access delay while maintaining manageable system complexity through structured protocol design.
Solution Approach 2:
STAs perform preliminary action by transmitting defer signals during the first contention period to indicate they have low-latency traffic ready for transmission. This advance notification allows the AP to prepare for and prioritize LLT transmission in subsequent contention periods, reducing overall channel access delay without requiring complex real-time decision-making.
2Reliability
If high priority EDCA with AP participation is implemented, then low-latency traffic transmission is improved, but the protocol complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where STAs transmit defer signals during the first contention period to indicate LLT availability, and the AP transmits defer signals during the second contention period to indicate its own LLT status. This feedback loop enables reliable identification and prioritization of low-latency traffic while maintaining protocol simplicity through standardized signal exchange procedures.
Solution Approach 2:
The defer signal mechanism serves multiple functions: it indicates LLT availability, enables STA-initiated priority access, allows AP self-indication of LLT status, and facilitates coordinated priority transmission. This multi-functionality improves low-latency traffic reliability without proportionally increasing protocol complexity, as a single signal type accomplishes multiple objectives.
3Productivity
If multiple STAs contend for channel access simultaneously, then channel utilization increases, but collision probability and latency increase
Solution Approach 1:
The patent applies local quality by treating low-latency traffic differently from regular traffic through the defer signal mechanism. STAs with LLT transmit specific signals during the first contention period, and the AP transmits defer signals during the second period. This differentiation ensures that LLT receives prioritized attention and faster channel access while allowing regular traffic to continue utilizing the channel, thus improving productivity without significantly increasing contention time.
Data Source
AI summary
An access point (AP) includes a transceiver. The transceiver is configured to at least one of (i) receive, during a high priority (Hip) enhanced distributed channel access (EDCA) contention period, from each of one or more stations (STAs), a respective first defer signal (DS) indicating that a respective STA has low latency traffic (LLT), and (ii) transmit, during the Hip EDCA contention period, a second DS indicating that the AP has LLT. The AP also includes a processor operably coupled to the transceiver. The processor is configured to manage the LLT for each of the one or more STAs.