Wireless LAN Base Station Grouping for Uplink Control Frame Collision Avoidance
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Solution Overview
Problem
In high-density wireless LAN environments, control frames used for multi-user transmission collide due to overlapping radio wave reachable ranges of adjacent base stations, leading to reduced communication efficiency and increased interference, especially in 11ax-compatible systems.
Innovation Solution
A radio control apparatus groups wireless LAN base stations outside of each other's radio wave reachable ranges and adjusts channel access timing to prevent control frame collisions, ensuring efficient uplink multi-user transmission by separating transmission timing between groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the density of wireless LAN base stations is increased to improve system capacity, then more users can be served, but control frames from different base stations collide due to overlapping radio wave reachable ranges, reducing communication efficiency
Solution Approach 1:
The patent segments base stations into different groups based on their radio wave reachable ranges and spatial relationships. By dividing the dense network into manageable groups, the system can manage interference patterns and allocate resources more effectively, preventing control frame collisions while maintaining high base station density
Solution Approach 2:
The patent implements dynamic timing adjustment for control frame transmission. Base stations dynamically modify their control frame transmission timings based on real-time radio environment conditions, detected collisions, and group assignments. This dynamic adaptation allows the system to maintain high density while avoiding persistent collisions through continuous optimization of transmission schedules
2Productivity
If base stations use the same channel to improve spectrum utilization, then frequency efficiency increases, but control frames collide in high-density environments, reducing reliability
Solution Approach 1:
The patent implements periodic control frame transmission with dynamically adjusted periods and timings for different base station groups. By using periodic actions with staggered timing, the system maintains efficient spectrum utilization through repeated channel usage while ensuring reliable control frame delivery by preventing simultaneous transmissions that cause collisions
Solution Approach 2:
The patent introduces a radio control apparatus as an intermediary that coordinates control frame transmissions between base stations. This mediator collects radio environment information, determines optimal transmission timings, and manages group assignments, thereby enabling reliable control frame delivery on shared channels without requiring base stations to directly negotiate with each other
3Area of stationary object
If transmission power is increased to extend radio wave reachable range, then coverage area increases, but interference between adjacent base stations increases, limiting parameter setting flexibility
Solution Approach 1:
The patent applies local quality by assigning different transmission parameters, timing offsets, and group assignments to different base stations based on their local radio environment conditions. Instead of uniform parameter settings across the network, each base station operates with locally optimized parameters that account for its specific position, interference patterns, and coverage requirements, thereby maintaining flexibility even in high-density deployments
Data Source
AI summary
A wireless LAN system in which a BSS composed of one wireless LAN base station and a plurality of wireless LAN terminals belonging to the wireless LAN base station, is set as a unit, and a plurality of the BSSs using an identical channel respectively perform uplink multi-user transmission, includes a radio control apparatus that is connected to the wireless LAN base station of each of the plurality of the BSSs and a wireless LAN terminal of the plurality of wireless LAN terminals of each of the plurality of the BSSs, and configured to collect radio information indicating interference states of respective radio waves, group sets of BSSs of the plurality of the BSSs, which are outside of radio wave reachable ranges of each other, as one of a plurality of groups among the plurality of the BSSs using the identical channel according to the radio information, and perform control to shift a timing of channel access for performing uplink multi-user transmission between the plurality of groups.