Wireless Controller Scheduling Isochronous Traffic Bursts
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Solution Overview
Problem
Wireless networks face interference issues due to collisions between isochronous traffic transmissions from multiple sources on the same frequency channel, which degrade the quality of service for video and audio traffic.
Innovation Solution
A wireless controller apparatus schedules the start times of isochronous traffic bursts from access point devices and client devices to minimize interference by determining radio frequency proximity and generating configuration parameters that stagger the transmission times, using techniques such as staggering burst start times, quiet elements, and coordinated channel access methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless access point devices transmit isochronous traffic simultaneously on the same frequency channel, then the throughput and utilization of the wireless network is improved, but interference and collision between transmissions increase
Solution Approach 1:
The patent segments the transmission opportunities by introducing superframe and subframe structures that divide the wireless medium into time-separated slots. Each access point device is assigned specific subframes for transmission, preventing simultaneous transmissions on the same frequency channel while maintaining high network utilization through structured time division multiplexing.
Solution Approach 2:
The patent implements periodic transmission cycles using superframes composed of multiple subframes. Access point devices transmit isochronous traffic in periodic bursts according to their assigned subframe schedules, creating regular, predictable transmission patterns that avoid collisions while maximizing channel utilization through systematic reuse of time slots.
2Loss of time
If multiple wireless access point devices transmit isochronous traffic at the same time, then the latency for data delivery is reduced, but packet loss rate increases due to collisions
Solution Approach 1:
The patent performs preliminary scheduling of transmission times through superframe and subframe assignment before actual data transmission. Access point devices are pre-configured with specific transmission slots based on their geographic locations and traffic requirements, allowing them to transmit immediately when their scheduled time arrives without contention, thus maintaining low latency while preventing collisions.
Solution Approach 2:
The patent implements dynamic scheduling where the wireless controller apparatus continuously monitors network conditions, device locations, and traffic patterns to optimize superframe and subframe assignments. This dynamic adjustment ensures that transmission schedules adapt to changing conditions, maintaining minimal latency while preventing packet loss through collision-free transmission opportunities.
Data Source
AI summary
Techniques are provided to reduce contention (interference) between bursts associated with multiple isochronous traffic flows. Generally, the techniques involve, at a plurality of wireless access point devices and/or a plurality of wireless client devices in a wireless network, initiating bursts of wireless transmissions carrying isochronous traffic from wireless access point devices to their associated client devices and/or from wireless client devices to their respective wireless access point devices at start times that are scheduled so as to reduce a likelihood of interference between multiple bursts of wireless transmissions for different isochronous traffic flows.