Coordinated Multi-AP Transmission With Orthogonal Frequency Allocation
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Solution Overview
Problem
Existing multi-AP transmission techniques face challenges in efficiently coordinating simultaneous transmissions among multiple access points (APs) due to resource allocation conflicts and interference, leading to suboptimal network performance.
Innovation Solution
Implementing coordinated orthogonal frequency division multiple access (COFDMA) and enhanced distributed channel access (EDCA) to manage time and frequency sharing among APs, allowing simultaneous multi-AP transmissions with orthogonal frequency resources, thereby optimizing resource utilization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple APs transmit simultaneously without coordination, then transmission speed increases, but interference and resource allocation conflicts worsen
Solution Approach 1:
The frequency spectrum is divided into orthogonal frequency resources (subchannels) that are allocated to different APs. Each AP is assigned specific frequency resources to transmit on, preventing interference between APs while allowing simultaneous transmissions. This frequency division is implemented through the COFDMA mechanism where the available spectrum is segmented into non-overlapping resource units.
Solution Approach 2:
A coordinator AP is introduced as an intermediary to manage and coordinate transmissions among multiple APs. The coordinator allocates time slots and frequency resources to participating APs, ensuring efficient resource utilization and preventing conflicts. This intermediary role is performed through the EDCA protocol which manages access to the shared medium.
2Productivity
If multiple APs transmit simultaneously without coordination, then network throughput increases, but resource allocation efficiency worsens
Solution Approach 1:
The system dynamically allocates time slots and frequency resources based on current network conditions and traffic demands. The EDCA protocol enables dynamic adjustment of transmission parameters, allowing the coordinator to reallocate resources to different APs as needed. This dynamic resource management optimizes throughput while adapting to changing network conditions.
Solution Approach 2:
The system changes transmission parameters such as transmission time, frequency allocation, and power levels to optimize resource utilization. By adjusting these parameters dynamically, the system can accommodate varying traffic patterns and optimize the balance between throughput and coordination complexity.
3Ease of manufacture
If APs use traditional transmission techniques, then implementation simplicity is maintained, but network performance deteriorates
Solution Approach 1:
The coordinator AP performs multiple functions: it manages channel access, allocates frequency resources, coordinates transmissions, and handles client communications. This multi-functional approach consolidates coordination tasks into a single device, maintaining implementation simplicity while significantly improving network performance through coordinated operation.
Data Source
AI summary
A first access point (AP) receives from a second AP a first frame comprising a multi-AP frequency channel assignment for a multi-AP transmission, the multi-AP frequency channel assignment comprising a first frequency channel allocated to the first AP for the multi-AP transmission. The first AP transmits a second frame on the first frequency channel during the multi-AP transmission, and, on condition that the first frequency channel is different from a primary channel of the first AP, transmits a portion of a preamble of the second frame, comprising the multi-AP frequency channel assignment, on the primary channel of the first AP.