Serial Null Data Packet Sounding for WLAN Interference Reduction
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Solution Overview
Problem
As the number of access points in a WLAN system increases to provide coverage to more stations, interference between access points with different basic service sets (BSSs) also increases, leading to a decrease in overall WLAN system performance.
Innovation Solution
The proposed solution involves an apparatus and method for efficiently performing sounding for channel estimation in a multiple access points (MAP) network of a wireless local area network (WLAN) system. This is achieved by receiving a MAP network frame, identifying the serial null data packet (NDP) transmission method and order, and transmitting NDPs based on the identified order within a NDP transmission period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of access points is increased to provide coverage to more stations, then the coverage area is improved, but the interference between access points increases
Solution Approach 1:
The patent applies preliminary action by performing MAP sounding before actual data transmission to obtain channel state information. This allows the system to understand the interference environment in advance and make informed decisions about transmission parameters, thereby reducing interference between access points while maintaining extended coverage.
Solution Approach 2:
The patent implements feedback mechanisms where access points transmit MAP action frames and receive feedback from stations. This feedback loop enables the system to continuously monitor channel conditions and adjust transmission parameters to minimize interference between multiple access points while preserving coverage area.
2Object-affected harmful factors
If MAP sounding is performed to obtain channel state information, then the interference reduction is improved, but the sounding process complexity increases
Solution Approach 1:
The patent merges the sounding process with existing WLAN management frames by using Action frames for MAP sounding. This integration allows channel state information to be obtained without requiring separate dedicated sounding protocols, thereby reducing the complexity increase while still achieving effective interference reduction between access points.
Solution Approach 2:
The patent introduces MAP action frames as intermediary structures that facilitate coordinated sounding between access points. These action frames serve as mediators that carry control information and coordinate the sounding process, simplifying the overall complexity while enabling effective channel state information exchange for interference reduction.
3Productivity
If multiple access points transmit simultaneously, then the system throughput is improved, but the interference between different basic service sets increases
Solution Approach 1:
The patent applies dynamics by enabling access points to adjust their transmission timing and parameters based on real-time channel state information obtained through MAP sounding. This dynamic adjustment allows the system to optimize throughput while minimizing interference between different basic service sets through coordinated transmission control.
Solution Approach 2:
The patent performs preliminary MAP sounding to obtain channel state information before simultaneous transmissions occur. This advance preparation enables access points to coordinate their transmissions and adjust parameters to maximize throughput while minimizing interference between different basic service sets.
Data Source
AI summary
An method of a first apparatus in a wireless local area network (WLAN) system, includes: receiving, from a second apparatus, a multiple access points (MAP) network frame; identifying, from the MAP network frame, a serial null data packet (NDP) transmission method for MAP sounding; identifying, from the MAP network frame, a NDP transmission order of the first apparatus within a NDP transmission period; and based on the NDP transmission order, transmitting, to a third apparatus, a first NDP within the NDP transmission period.