Wireless Defer Signals for Low-Latency Channel Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless networks face challenges in supporting delay-sensitive applications like augmented reality and unmanned vehicles due to channel access delays, which existing technologies have not adequately addressed.
Innovation Solution
Implementing a defer signal mechanism that allows stations with low-latency traffic to block other stations from accessing the channel temporarily, using predefined time boundaries and enhanced distributed channel access parameters to prioritize and ensure timely transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional channel access mechanisms are used, then network simplicity is maintained, but channel access delay increases for low-latency applications
Solution Approach 1:
The patent applies preliminary action by having stations transmit defer signals in advance at predetermined time boundaries (such as IFS boundaries or service period boundaries) before their actual data transmission. This preemptive signaling blocks other stations from contending for the channel during a specified period, ensuring the low-latency station gains priority access without requiring complex real-time arbitration mechanisms.
Solution Approach 2:
The defer signal acts as an intermediary mechanism between stations. Instead of direct contention or complex negotiation, the defer signal serves as a mediating block that temporarily prevents other stations from accessing the channel. This intermediary signal simplifies the access control process while achieving priority access for low-latency traffic.
2Reliability
If defer signals are transmitted frequently to ensure priority access, then low-latency traffic transmission reliability improves, but channel utilization efficiency decreases
Solution Approach 1:
The patent implements periodic action by transmitting defer signals at predetermined time boundaries rather than continuously. These boundaries include interframe spacing (IFS) start/end times, service period (SP) start/end times, or other periodically occurring time markers. This periodic transmission ensures reliable priority access when needed while avoiding unnecessary defer signals during periods when priority access is not required, thereby maintaining channel utilization efficiency.
Solution Approach 2:
The system changes the parameter of signal transmission timing from continuous or random to predetermined periodic boundaries. By adjusting the timing parameters (IFS boundaries, SP boundaries) and the duration for which defer signals are effective, the system optimizes both reliability for low-latency traffic and overall channel utilization efficiency.
3Reliability
If the defer signal blocks all stations from contending for the channel, then low-latency traffic priority is ensured, but channel access flexibility is reduced
Solution Approach 1:
The patent applies partial action by blocking stations from contending for the channel only during specific predetermined periods rather than permanently or continuously. The defer signal effectiveness is limited to specific time windows (e.g., during IFS periods or service periods), allowing stations to regain normal contention-based access flexibility outside these periods. This partial blocking ensures low-latency priority when needed while preserving overall channel access flexibility.
Data Source
AI summary
An embodiment includes a STA with low latency traffic may transmit a defer signal to preempt one or more others STAs from contending for channel access, whereby the STA may quickly obtain channel access to transmit low latency frames, whereby the defer signal may place the one or more other STAs in an extended interframe space (EIFS) state or in an error state.