Coordinated Scheduling for Overlapping Basic Service Sets
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Solution Overview
Problem
Existing network topologies with independent schedulers for each basic service set (BSS) can degrade quality of service (QoS) for applications requiring bounded latency, such as virtual reality glasses.
Innovation Solution
Coordinated scheduling between access points (APs) and wireless devices, including repeaters and stations, using techniques like Coordinated Time Division Multiple Access (TDMA) to synchronize timing and share transmit opportunities (TXOPs), thereby reducing interference and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If independent schedulers are used for each basic service set (BSS), then device complexity is reduced and operation is simplified, but network latency increases and QoS deteriorates
Solution Approach 1:
The patent merges independent BSS schedulers into a coordinated scheduling system where multiple BSSs share a common scheduling framework. Access points exchange scheduling information and coordinate their TXOP allocations to reduce latency while maintaining manageable complexity through standardized protocols.
Solution Approach 2:
The patent introduces a coordination mechanism as an intermediary between independent BSS schedulers. This mediator enables information exchange and coordinated decision-making among access points, allowing them to optimize network-wide latency without requiring complete integration of scheduler complexity.
2Adaptability or versatility
If multiple access points operate independently in overlapping BSSs, then device autonomy is maintained, but interference increases and channel access efficiency decreases
Solution Approach 1:
The patent applies local quality by allowing each access point to maintain autonomous scheduling decisions for its local BSS while incorporating coordination information from neighboring BSSs. This enables adaptive behavior at each node based on local conditions and global coordination requirements.
Solution Approach 2:
The patent implements feedback mechanisms where access points exchange scheduling status and interference information with neighboring BSSs. This feedback loop enables autonomous APs to adjust their transmissions based on real-time channel conditions and coordinated scheduling decisions, reducing interference while preserving autonomy.
3Reliability
If transmit opportunities (TXOPs) are not shared between BSSs, then BSS isolation is maintained, but channel utilization decreases and productivity drops
Solution Approach 1:
The patent introduces dynamic TXOP sharing where the degree of sharing between BSSs can be adjusted based on traffic conditions, channel state, and QoS requirements. This dynamic approach allows the system to maintain BSS isolation when needed while enabling productivity improvements through coordinated sharing when beneficial.
Solution Approach 2:
The patent creates a universal scheduling framework that can operate in multiple modes: complete BSS isolation, partial sharing, and full coordination. This multi-functional system adapts to different network scenarios, maintaining reliability through isolation when required while enabling productivity gains through sharing when appropriate.
Data Source
AI summary
Technology disclosed herein may include an access point (AP) which may include a processing device. The processing device may transmit, at the access point, a first transmission in a first basic service set (BSS1) transmit opportunity (TXOP) in a first shared TXOP; send, from the access point to an additional access point, a first TXOP sharing request to send trigger frame; and receive, at the access point from the additional access point, a first clear to send (CTS) message.