Multi-AP WLAN Transmissions With Coordinated RTS Resource Allocation
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Solution Overview
Problem
Existing wireless local area networks (WLANs) with multiple access points (APs) face inefficiencies in coordinating resource allocation and medium reservation, leading to interference and reduced throughput in peer-to-peer traffic within basic service sets (BSSs).
Innovation Solution
Implementing a method for multi-AP wireless networks that involves transmitting a multi-AP ready-to-send (RTS) frame with resource allocation information, receiving a clear-to-send (CTS) frame, and subsequently transmitting data frames, utilizing coordinated channel access and resource allocation across multiple APs and stations (STAs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional single-AP RTS/CTS mechanism is used, then each AP can reserve medium independently, but interference occurs between peer-to-peer traffic across multiple APs and resource allocation is inefficient
Solution Approach 1:
The patent merges the RTS/CTS mechanism across multiple APs by introducing a multi-AP RTS frame that coordinates resource allocation among several APs simultaneously. This combines the medium reservation function of traditional RTS with the coordination capability needed for multi-AP operation, eliminating interference between peer-to-peer traffic while improving overall throughput through efficient resource sharing.
Solution Approach 2:
The multi-AP RTS frame acts as an intermediary coordination mechanism between multiple APs. Instead of each AP independently reserving medium without coordination, the RTS frame serves as a mediator that carries resource allocation information for multiple APs and STAs, enabling coordinated channel access and preventing interference while maintaining productivity.
2Ease of operation
If independent medium reservation is implemented at each AP, then local traffic can be served efficiently, but coordinated resource allocation across multiple APs is lost leading to channel access conflicts
Solution Approach 1:
The multi-AP RTS frame provides universal functionality by serving multiple APs and STAs simultaneously with a single coordination message. Instead of requiring separate reservation mechanisms for each AP, this universal frame structure enables coordinated resource allocation across the entire multi-AP domain, improving both ease of operation and productivity through unified channel access control.
Solution Approach 2:
The RTS frame performs preliminary coordination action by allocating resources in advance before actual data transmission occurs. This preliminary resource allocation ensures that multiple APs and STAs have pre-coordinated channel access schedules, preventing conflicts during transmission and improving overall resource utilization efficiency while simplifying operational coordination.
3Productivity
If resource allocation information is not shared across APs, then each AP manages its own traffic independently, but peer-to-peer traffic experiences interference and reduced throughput
Solution Approach 1:
The patent merges resource allocation coordination across multiple APs by incorporating allocation information for all APs and STAs into a single multi-AP RTS frame. This combining approach enables peer-to-peer traffic to operate interference-free while distributing the coordination complexity through a standardized frame structure that reduces operational burden despite the multi-AP environment.
Data Source
AI summary
Methods and apparatuses for operating in multi-access point (AP) wireless networks are described herein. A method performed by an AP may include transmitting, using a set of resources, a multi-AP ready-to-send (RTS) frame to at least one other AP and a plurality of stations (STAs). The method may include transmitting another frame using a portion of the set of resources. The method may include receiving, using the portion of the set of resources, a clear-to-send (CTS) frame from at least one STA of the plurality of STAs in response to the another frame. The method may include transmitting, using the portion of the set of resources, a data frame to the at least one STA. The multi-AP RTS frame may include resource allocation information for the at least one other AP and the plurality of STAs.