Adaptive Beamforming for Wireless Access Point Handoff Indication
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Solution Overview
Problem
Existing wireless access points (APs) in WLANs lack effective methods to configure their RF coverage regions optimally, leading to unreliable and untimely handoffs between WLAN and WWAN, which can disrupt voice communication sessions.
Innovation Solution
The implementation of an adaptive beamforming technique, specifically minimax optimization, during a configuration procedure to adjust wireless transceiver parameters, ensuring minimized RF signal coverage for devices outside the desired region and maximized coverage for those within, thereby optimizing the AP's RF coverage region for reliable handoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixed RF coverage configuration is used for AP tripwire, then device complexity is reduced and ease of operation is improved, but handoff reliability and timeliness deteriorate due to inability to adapt to varying coverage requirements
Solution Approach 1:
The AP tripwire automatically performs self-configuration by detecting communication devices in the ingress/egress region and autonomously determining optimal RF coverage boundaries and transceiver parameters, eliminating the need for manual configuration while ensuring reliable handoff detection
Solution Approach 2:
The system performs preliminary configuration actions by pre-positioning the AP tripwire in the ingress/egress region and pre-configuring its RF coverage boundaries before actual handoff events occur, allowing it to be ready to provide timely handoff notifications
2Reliability
If RF coverage boundaries are expanded to maximize handoff detection, then handoff timeliness is improved, but false detections increase for devices outside the desired region
Solution Approach 1:
The AP tripwire implements differentiated RF coverage by creating a localized coverage region specifically tailored to the ingress/egress area, using directional beamforming and spatial filtering to provide targeted coverage that maximizes handoff detection while minimizing false detections from devices outside the desired region
Solution Approach 2:
The system uses feedback from detected communication devices to dynamically adjust RF coverage boundaries, analyzing device positions and handoff patterns to refine coverage areas and reduce false detections while maintaining timely handoff notification capability
3Manufacturing precision
If manual configuration of RF coverage parameters is performed, then manufacturing precision is reduced and ease of manufacture is improved, but coverage optimization and handoff reliability deteriorate
Solution Approach 1:
The AP tripwire automatically performs self-configuration by detecting communication devices in the ingress/egress region and autonomously determining optimal RF coverage boundaries and transceiver parameters, eliminating the need for manual configuration while ensuring reliable handoff detection
Solution Approach 2:
The patent replaces manual mechanical configuration processes with automated electronic detection and determination systems, using signal processing and algorithmic optimization to precisely configure RF coverage parameters without human intervention
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability and timeliness of mobile device handoffs between WLAN and WWAN by accurately configuring the AP's RF coverage, reducing false detections and ensuring adequate forewarning for seamless transitions.
Implementation Method 1
wireless transceiver parameters of the wireless access point are automatically determined and set to adjust boundaries of an RF coverage region of the wireless access point through use of an adaptive beamforming technique
Data Source
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AI summary
Methods and apparatus for use in configuring a wireless access point (AP) which serves as a handoff indication mechanism ("AP tripwire") in a wireless local area network (WLAN) for mobile device handoffs between the WLAN and a wireless wide area network (WWAN) are described. During a configuration procedure or training mode of operation of the wireless AP, radio frequency (RF) signals transmitted from a plurality of communication devices are received at the wireless AP. The plurality of communication devices include a first group of communication devices positioned at locations of undesired RF coverage of the wireless AP, outside of an RF coverage boundary of a WLAN coverage region of one or more other wireless APs of the WLAN. The plurality of communication devices also include a second group of communication devices positioned at locations of desired RF coverage of the wireless AP, around the RF coverage boundary of the WLAN coverage region and within the WWAN coverage region. Wireless transceiver parameters of the wireless AP are automatically determined and set to adjust boundaries of an RF coverage region, such that RF signal coverage of the first group of communication devices is minimized but RF signal coverage of the second group of communication devices is maximized. Preferably, the parameters of the wireless transceiver are determined through use of an adaptive beamforming technique (e.g. a minimax optimization) which is performed automatically by the wireless AP without user intervention. After the configuration procedure, the wireless AP operates with use of the configured wireless transceiver parameters in a normal, steady-state mode of operation as the AP tripwire of the WLAN.