WLAN Power Reduction Mechanism for WEP Key Mismatch
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Solution Overview
Problem
Mobile communication devices experience battery drain and communication failures due to incorrect Wired Equivalent Privacy (WEP) key usage and inability to acquire an IP address during WLAN connections, leading to continuous frame retries and connectivity errors.
Innovation Solution
A power reduction mechanism that detects incorrect WEP key usage and IP address acquisition failures, takes power-conserving actions such as disabling the WLAN profile, disassociating from the access point, adding it to a 'ban' list, and notifying the user, to prevent unnecessary power consumption and connectivity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device continuously retries frame transmission and reconnection attempts, then connectivity reliability is improved, but battery power is depleted
Solution Approach 1:
The system performs preliminary detection of WEP key correctness and IP address acquisition status before initiating continuous reconnection attempts. By checking these conditions in advance (passive scanning without full authentication), the device can avoid unnecessary continuous retries that would deplete battery power, thus resolving the contradiction between connectivity reliability and energy consumption.
2Reliability
If the device performs full authentication and IP acquisition procedures, then connection reliability is improved, but power consumption increases
Solution Approach 1:
The system performs only the necessary partial authentication (WEP key verification) and checks IP address acquisition status, rather than completing full authentication and IP acquisition procedures every time. This partial action approach maintains connection reliability by detecting key mismatches and acquisition failures while significantly reducing power consumption compared to full procedures.
3Measurement precision
If the device monitors communication exchange continuously, then detection precision is improved, but battery drain increases
Solution Approach 1:
The system monitors communication exchange periodically by checking WEP key correctness and IP address acquisition status at intervals, rather than continuously. This periodic monitoring maintains adequate detection precision for identifying connectivity issues while significantly reducing battery drain compared to continuous monitoring.
Data Source
AI summary
A wireless communications device stores a first cryptographic key in connection with a profile, the profile indicating a security type requiring no credentials and a network name. An access point (AP) supports a wireless local area network (WLAN), the WLAN having the network name, the WLAN supporting the security type and the WLAN requiring a second cryptographic key for encryption. The wireless communications device successfully authenticates and associates with the AP, thus joining the WLAN. Subsequent to joining the WLAN, the wireless communications device conducts encrypted communications with the AP and detects from the encrypted communications that there is a mismatch between the first cryptographic key and the second cryptographic key. Responsive to detecting the mismatch, the wireless communications device bans the profile or the AP or both.