Multi-AP Coordination Dynamic Bandwidth Allocation
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Solution Overview
Problem
Existing coordinated frequency division multiple access (C-(O) FDMA) techniques in Multi-AP Coordination (MAPC) lack flexibility in reallocating channel bandwidth due to static assignments and do not account for dynamic changes in data traffic and channel conditions, leading to inefficiencies and reduced reliability.
Innovation Solution
Implementing a group leader that collects channel information from user devices and access points using subchannel selective transmission (SST) to dynamically allocate resource units (RUs) on a per-station basis, optimizing bandwidth allocation based on real-time needs and interference conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If static bandwidth assignment is used in C-(O) FDMA, then device complexity is reduced and ease of operation is improved, but spectrum utilization efficiency deteriorates and productivity decreases due to inability to adapt to dynamic traffic conditions
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the group leader continuously reallocates resource units to APs based on real-time traffic conditions and channel quality feedback. This transforms the static bandwidth assignment of C-(O) FDMA into a dynamic system that adapts to changing network conditions, thereby improving spectrum utilization efficiency without requiring complex manual configuration at each AP.
Solution Approach 2:
The patent establishes a feedback mechanism where APs report channel quality and traffic conditions to the group leader, which then adjusts bandwidth allocation accordingly. This closed-loop feedback system enables automatic optimization of spectrum utilization based on actual network conditions, resolving the contradiction between improved productivity and device complexity by centralizing the computational burden.
2Reliability
If static resource unit allocation is implemented, then ease of operation is improved and device complexity is reduced, but reliability deteriorates due to lack of adaptation to changing channel conditions
Solution Approach 1:
The patent implements a feedback mechanism where APs continuously report channel quality indicators (CQI) and traffic conditions to the group leader. Based on this feedback, the group leader dynamically adjusts resource unit allocations to maintain optimal communication reliability under varying channel conditions, while keeping individual AP operations simple through centralized control.
Solution Approach 2:
The group leader acts as an intermediary that centralizes the complexity of dynamic bandwidth management. Individual APs maintain operational simplicity by following allocations from the group leader, while the intermediary handles the complex task of adapting to changing channel conditions and optimizing reliability across the entire coordinated group.
3Productivity
If coordinated frequency division multiple access is used, then interference between APs is reduced, but spectrum efficiency deteriorates due to fixed bandwidth allocation that cannot exploit opportunistic spectrum access
Solution Approach 1:
The patent combines coordinated frequency division multiple access with dynamic resource unit allocation. The group leader assigns specific frequency sub-channels (resource units) to different APs based on real-time channel conditions, allowing the system to maintain the interference-reducing benefits of frequency division while dynamically optimizing spectrum efficiency by allocating bandwidth where it is most needed and where interference is minimal.
Data Source
AI summary
The embodiments herein supplement a coordinated access point (AP) scheme (such as Multi-AP Coordination (MAPC) with C-(O) FDMA) with a protocol that determines sub-channel/resource unit (RU) allocations for each AP in a coordinated group (CG) on a per-station (STA) basis. A group leader for the CG can receive channel information from the STAs (which is forwarded to the group leader from the APs in the CG). Using this information, the group leader can assign RUs to the STAs to divide up the bandwidth of the wireless medium shared by the APs in the CG.