Multi-AP WLAN Scheduling Through Coordinated Service Periods
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Solution Overview
Problem
The challenge is to provide a scheduling method and device based on multi-AP operation in a WLAN system, specifically enabling one AP to schedule the service periods of other APs within the system.
Innovation Solution
A method where a first type station receives information about service periods from a second type station and performs frame exchanges with associated third type stations, while another method involves a second type station setting and transmitting information about service periods based on input from multiple first type stations, including restrictions and allowances for transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple APs operate simultaneously in a WLAN system, then transmission capacity and bandwidth are improved, but coordination complexity and scheduling difficulty increase
Solution Approach 1:
The patent introduces a scheduling AP as an intermediary that coordinates service periods among multiple APs. The scheduling AP receives service period information from other APs, processes it, and transmits the coordinated information to relevant STAs, thereby simplifying the coordination complexity while maintaining multi-AP transmission capacity
Solution Approach 2:
The patent creates a unified scheduling framework where all APs operate under common service period information, establishing an equipotential coordination environment. This allows multiple APs to transmit simultaneously without interference by ensuring they operate on synchronized time resources
2Productivity
If one AP schedules service periods for other APs, then scheduling efficiency is improved, but information transmission overhead increases
Solution Approach 1:
The patent merges service period information from multiple APs into a single coordinated schedule transmitted by the scheduling AP. Instead of each AP transmitting separate service period information, the scheduling AP consolidates this information, reducing redundant transmissions while maintaining scheduling efficiency
Solution Approach 2:
The scheduling AP receives service period information from other APs, creates a coordinated version of this information, and transmits it to STAs. This copying mechanism allows efficient distribution of scheduling information without requiring direct communication between all AP pairs
3Reliability
If service periods are restricted for specific STAs, then transmission reliability is improved, but system flexibility decreases
Solution Approach 1:
The patent implements dynamic service period restrictions where the scheduling AP adjusts which STAs are restricted during specific service periods based on current system conditions. This allows the system to maintain reliability for priority transmissions while adapting flexibility to different operational scenarios
Solution Approach 2:
The patent applies service period restrictions locally to specific STAs and time periods rather than globally. The scheduling AP designates specific STAs as restricted during specific service periods, allowing other STAs to maintain normal access, thereby preserving system flexibility while ensuring transmission reliability for critical communications
Data Source
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AI summary
Disclosed are a method and apparatus for scheduling on the basis of multiple access point (AP) operations in a wireless LAN system. A method, performed by a first type station (STA) in a wireless LAN system according to one embodiment of the present disclosure, may comprise the following steps of: receiving, from a second type STA, information relating to one or more service periods (SPs) for the first type STA among a plurality of first type STAs; and performing, on the basis of the information relating to one or more SPs, a frame exchange with one or more third type STAs associated with the first type STA. The one or more SPs may comprise SPs that are restricted from transmitting STAs other than the first type STA and the one or more third type STAs. The information relating to one or more SPs may further comprise information about other one or more SPs that are allowed to transmit one or more other first type STAs among the plurality of first type STAs, or one or more among one or more other third type STAs associated with the one or more other first type STAs.