Access Point OFDMA Trigger Frames for Multi-AP Resource Allocation
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Solution Overview
Problem
The current wireless LAN standards lack a defined procedure for allocating frequency resources for Orthogonal Frequency Division Multiple Access (OFDMA) communication among multiple access point devices, making it difficult to optimize communication efficiency.
Innovation Solution
An access point device transmits a trigger frame that includes information for allocating frequency resources to other cooperating access points, ensuring coordinated OFDMA communication by associating identification information with frequency resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points perform OFDMA communication at the same timing without a defined allocation procedure, then communication efficiency can be improved through coordinated operation, but frequency resource allocation becomes difficult and interference increases
Solution Approach 1:
A trigger frame is introduced as an intermediary control mechanism to coordinate frequency resource allocation among multiple access points. The trigger frame contains allocation information that mediates the resource distribution, allowing APs to perform OFDMA communication at the same timing without direct complex interaction between them.
Solution Approach 2:
Frequency resource allocation is performed in advance through the trigger frame before the actual OFDMA communication occurs. This preliminary allocation ensures that multiple APs know their assigned resources beforehand, enabling synchronized communication without on-the-fly coordination complexity.
2Productivity
If frequency resources are allocated to multiple access points for simultaneous OFDMA communication, then throughput is improved, but the lack of defined allocation procedure causes difficulty in proper resource distribution
Solution Approach 1:
The trigger frame serves as a standardized intermediary that simplifies the resource allocation procedure. Instead of requiring complex multi-AP negotiation protocols, the trigger frame provides a straightforward mechanism for distributing frequency resources, making the system easier to operate while maintaining high throughput.
3Productivity
If multiple access points use the same frequency resources simultaneously, then communication efficiency increases, but interference between access points increases
Solution Approach 1:
The frequency spectrum is segmented and allocated to different access points through the trigger frame. Each AP receives specific frequency resource assignments, allowing simultaneous communication while dividing the spectrum to minimize interference between APs.
Solution Approach 2:
Different frequency resources are assigned to different access points based on their specific communication needs and locations. This localized resource allocation ensures that each AP operates on optimized frequency segments, improving overall efficiency while reducing cross-AP interference.
Data Source
AI summary
An access point device transmits, in communication in which one or more other cooperating access points use Orthogonal Frequency Division Multiple Access (OFDMA) technology based on at least externally collected information, a trigger frame including information indicating a frequency resource to be used for communication with a station under control thereof to the one or more other cooperating access points. The trigger frame includes information in which identification information that identifies another access point and information indicating a frequency resource to be allocated to the other access point are associated with each other, and the trigger frame allocates a transmission opportunity using a different frequency resource to each of the one or more other cooperating access points.