Wireless LAN Beacon Criteria for Proactive BSS Transitions
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Solution Overview
Problem
Wireless terminals struggle to actively transition to a better base station for stable communication due to limited information in Beacon signals, leading to delayed or unsuccessful transitions in environments with multiple nearby base stations.
Innovation Solution
A wireless device and base station system that includes a control unit to manage inclusion information in Beacon signals, allowing wireless terminals to select optimal base stations based on additional criteria beyond received electric power, enabling proactive BSS transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wireless terminal uses only received electric power (RSSI) from Beacon signals to judge BSS transition, then the judgment process is simple, but the terminal cannot make accurate transition decisions when other important information is needed
Solution Approach 1:
The patent segments the Beacon signal information into multiple distinct elements (RSSI, BSS load, channel information, etc.) that can be independently evaluated. The terminal divides the decision-making process into separate judgment criteria, allowing it to assess multiple factors rather than relying on a single RSSI measurement.
Solution Approach 2:
The patent adds additional dimensions to the BSS transition judgment by incorporating multiple information elements beyond RSSI. Instead of a one-dimensional decision based solely on signal strength, the terminal now evaluates multi-dimensional criteria including BSS load, channel conditions, and other Beacon signal elements, enabling more comprehensive decision-making.
2Measurement precision
If the wireless terminal performs active scan or uses centralized control to judge BSS transition, then the transition judgment can be more accurate, but the process takes more time
Solution Approach 1:
The patent applies preliminary action by having base stations pre-populate the Beacon signal with all necessary information elements (RSSI, BSS load, channel information, etc.) before the terminal needs to make a transition decision. This allows the terminal to perform immediate local evaluation without initiating time-consuming active scans or waiting for centralized control responses.
Solution Approach 2:
The terminal performs self-service by autonomously evaluating the multi-element Beacon signal information and making BSS transition decisions independently. This eliminates the need for time-consuming interactions with centralized control stations or active scan procedures, as the terminal can immediately process the available Beacon information and execute transitions when criteria are met.
3Use of energy by moving object
If the wireless terminal waits for communication quality to degrade before starting BSS transition process, then the terminal conserves energy, but communication stability is compromised
Solution Approach 1:
The patent enables preliminary evaluation of multiple BSS parameters through continuous monitoring of Beacon signals. The terminal can identify deteriorating trends in BSS load, channel conditions, and other elements before communication quality critically degrades, allowing proactive transition initiation that prevents instability while avoiding excessive energy consumption from constant active scanning.
Solution Approach 2:
The multi-element Beacon signal provides continuous feedback about BSS conditions (load, channel quality, etc.) that allows the terminal to monitor trends and make informed transition decisions. This feedback mechanism enables the terminal to respond to changing conditions appropriately, maintaining communication stability by transitioning before quality degradation becomes severe, while conserving energy by avoiding unnecessary transitions.
Data Source
AI summary
A communication device determines a communication quality with a base station, requests a neighboring base station for a transition judgment information to transmit information to become a judgment criterion of the communication quality to be included in a Beacon signal at a stage before the communication quality degrades to an extent that the base station is immediately switched, and selects a base station with which a communication connection should be established on the basis of the transition judgment information included in the Beacon signal transmitted in response to the transition judgment request. The communication device is applicable to a communication system in the wireless LAN.