Dynamic Spectral Mask Allocation for WLAN Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless local area network (WLAN) protocols, such as IEEE 802.11, face limitations in channel allocation due to fixed spectral masks, leading to interference from devices with varying Receive Signal Strength Indication (RSSI) and restricting flexible scheduling, which reduces system efficiency and capacity.
Innovation Solution
A system and method that dynamically calculates a channel assignment scheme based on the spectral mask capabilities of client devices, allowing for flexible allocation of bandwidth and communication channels, and instructs devices to set transmission frequencies, thereby reducing interference and improving transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed spectral mask is used in current WLAN protocols, then implementation is simple and backward compatible, but flexible scheduling is restricted and interference occurs between devices with varying RSSI
Solution Approach 1:
The patent implements dynamic spectral masks that can be adjusted based on device capabilities and channel conditions. The AP receives spectral mask capability indicators from client devices and dynamically assigns appropriate spectral masks, allowing the system to adapt to varying RSSI levels and interference conditions while maintaining backward compatibility through optional capability signaling.
Solution Approach 2:
The patent changes the spectral mask parameter from a fixed standard value to a dynamic parameter that can be selected from multiple options. The system introduces spectral mask capability indicators and dynamically adjusts spectral mask parameters based on device capabilities, enabling flexible scheduling while managing complexity through standardized capability signaling.
2Productivity
If multiple devices transmit simultaneously on adjacent channels, then system capacity increases, but intercarrier interference occurs between devices with different spectral mask capabilities
Solution Approach 1:
The patent applies different spectral mask characteristics to different devices based on their capabilities. The AP assigns specific spectral masks to individual devices or device groups, allowing each device to transmit with appropriate spectral characteristics that minimize interference to adjacent channels while maximizing system capacity.
Solution Approach 2:
The patent converts the potential harmful effect of spectral leakage into a beneficial feature by using enhanced spectral masks that deliberately shape the spectral content. Devices with enhanced capabilities can transmit on adjacent channels with controlled spectral leakage patterns that actually improve overall system capacity while minimizing interference through intelligent spectral management.
3Reliability
If a single spectral mask is used for all devices, then implementation is simple, but devices with varying RSSI experience interference from adjacent signals
Solution Approach 1:
The patent performs preliminary assessment of device spectral mask capabilities during the association or capability exchange phase. The AP receives spectral mask capability indicators from client devices in advance and stores this information for subsequent channel assignment decisions, enabling reliable transmission quality without requiring complex real-time adjustments.
Data Source
AI summary
A system of wireless communication by an access point (AP) comprising: a receiver adapted to receive a plurality of messages each originated from one of a plurality of client devices and each indicative of a spectral mask capability thereof; a processor adapted to calculate a channel assignment scheme for allocating bandwidth and/or communication channels to the plurality of client devices based on the spectral mask capability of each of the plurality of client devices; and a transmitter adapted to transmit to each of the plurality of client devices instructions to set transmission frequency based on the calculated channel assignment scheme.