Multi-AP RTS Resource Allocation for WLAN Interference Control
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems with multiple access points (APs) face challenges in efficiently managing resource allocation and medium reservation, leading to inefficiencies in data transmission and interference among stations (STAs) within and outside the basic service set (BSS).
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, followed by a clear-to-send (CTS) frame and data frame, to coordinate channel access and resource usage among APs and STAs, enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-AP RTS/CTS mechanism is used, then medium reservation works for single AP, but resource allocation and interference management fail in multi-AP environments
Solution Approach 1:
The patent merges the RTS/CTS mechanism from single-AP operation with multi-AP coordination by transmitting a multi-AP RTS frame that includes resource allocation information for multiple APs and STAs simultaneously. This combines the medium reservation function with resource allocation, allowing one frame to serve multiple purposes across multiple basic service sets.
Solution Approach 2:
The multi-AP RTS frame serves multiple functions: it performs medium reservation for the transmitting AP, allocates resources to other APs and STAs, and enables coordinated transmission across multiple BSSs. This multi-functional approach eliminates the need for separate reservation and allocation mechanisms.
2Productivity
If resource allocation information is included in RTS frame, then transmission efficiency improves, but frame complexity increases
Solution Approach 1:
The patent combines medium reservation and resource allocation into a single RTS frame transmission, eliminating the need for separate reservation frames and allocation messages. This merging reduces the number of frames to be processed while improving transmission efficiency.
Solution Approach 2:
The RTS frame transmits resource allocation information in advance before actual data transmission occurs. This preliminary allocation allows receiving STAs and other APs to prepare for coordinated transmission, reducing delays and improving overall efficiency.
3Productivity
If multiple APs transmit simultaneously without coordination, then network throughput increases, but interference among STAs worsens
Solution Approach 1:
The system performs preliminary medium reservation and resource allocation before simultaneous transmission occurs. The multi-AP RTS frame reserves the medium and allocates specific time-frequency resources to each AP and STA, ensuring that while multiple APs can transmit simultaneously, they do so in a coordinated manner that prevents interference.
Solution Approach 2:
The multi-AP RTS frame acts as an intermediary coordination mechanism between multiple APs and STAs. It carries resource allocation information that mediates the transmission schedule, allowing simultaneous transmissions to be coordinated and interference to be avoided through proper time-frequency resource assignment.
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.