DBVC Repeater Beacon Timing Offset and Duty Cycle Adjustment
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Solution Overview
Problem
DBVC operation in WiFi networks faces challenges such as scheduling issues, performance optimization in time-divided networks, timing/resource clashes, and interoperability with third-party devices, leading to link instability and support limitations for legacy devices.
Innovation Solution
A method involving a repeater configured to communicate according to the DBVC protocol, which includes obtaining the next root AP TBTT, determining the time to delay the repeater's TBTT to avoid conflicts, adjusting DBVC duty cycles based on buffer loads, and optimizing transmissions through trigger-based mechanisms and DPI to prioritize TCP ACK packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DBVC protocol divides time into on-channel and off-channel periods for dual band operations, then cost is reduced by removing the need for two separate physical radios, but scheduling issues and timing/resource clashes occur causing link instability
Solution Approach 1:
The patent implements dynamic TBTT adjustment where the repeater dynamically modifies its beacon transmission timing based on detected root AP TBTT values. The repeater calculates an offset from the root AP's TBTT and adjusts subsequent TBTT values to maintain proper timing relationships, preventing beacon collisions while operating in time-divided dual-band mode.
Solution Approach 2:
The system employs feedback mechanisms where the repeater continuously monitors root AP beacon transmissions, detects TBTT values, and uses this information to adjust its own scheduling. The repeater calculates timing offsets based on received beacons and dynamically adjusts its TBTT to avoid conflicts, creating a closed-loop timing synchronization system.
2Adaptability or versatility
If repeater acts as AP during on-channel periods and as STA during off-channel periods, then dual band operation is achieved on single radio, but beacon collisions occur between root AP and repeater
Solution Approach 1:
The repeater performs preliminary timing calculations by detecting the root AP's TBTT before setting its own beacon transmissions. By advance calculation of the TBTT offset based on detected root AP timing, the repeater ensures its beacons will not collide with root AP beacons, preventing interference before it occurs.
Solution Approach 2:
The patent introduces a timing offset dimension to the TBTT parameter. Instead of using fixed or identical TBTT values, the system adds a calculated offset (derived from detected root AP TBTT and timing relationships) to create staggered beacon transmission schedules, separating beacons in the time dimension to avoid collisions.
3Adaptability or versatility
If DBVC protocol is used for time division multiple access, then single radio dual band operation is enabled, but performance optimization in time divided network becomes challenging
Solution Approach 1:
The system dynamically changes timing parameters including TBTT offset values and duty cycle ratios. The repeater adjusts its on-channel and off-channel duty cycles based on detected network conditions and timing relationships, optimizing performance by adapting parameter values rather than using fixed configurations.
Data Source
AI summary
Example methods relate to avoiding beacon collisions between a repeater and a root AP, optimizing traffic flows based on buffers queued within hardware, and/or optimizing transmissions through a trigger-based mechanism.An example method includes determining loads on buffers within a repeater configured to communicate according to a DBVC protocol. The loads on the buffers correspond to data to be transmitted within upstream and downstream networks. The method includes determining whether to adjust a DBVC duty cycle of the repeater based on the loads. The DBVC duty cycle includes: an on channel duty cycle comprising a ratio of time on an on channel to total time on both the on and off channels; or an off channel duty cycle comprising a ratio of time on the off channel to total time on both the on and off channels. The method includes adjusting the DBVC duty cycle of the repeater.