Selective Signal Deciphering via Demodulation Pattern Detection
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Solution Overview
Problem
In GSM wireless communication networks, the lack of advance knowledge about whether received SACCH data blocks are ciphered or unciphered leads to inefficient processing, as mobile devices assume deciphering and repeat decoding, consuming significant resources and increasing power consumption.
Innovation Solution
A method and device that demodulate received communication signals, compare the results to a characteristic pattern indicative of unciphered transmission, and control decoding with or without deciphering based on this comparison, allowing for selective deciphering and reducing unnecessary processing cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If selective ciphering is implemented to prevent eavesdropping, then security is improved, but receiving devices cannot determine whether signals are ciphered or not, causing unnecessary processing and power consumption
Solution Approach 1:
The patent applies preliminary action by examining a predetermined portion of the signal before full decoding to determine whether the signal is ciphered. This preliminary check allows the device to make an informed decision about whether to proceed with full decoding, thereby avoiding unnecessary processing and reducing power consumption while maintaining security through selective ciphering.
2Reliability
If selective ciphering is implemented, then security is improved, but processing time increases due to additional decoding cycles
Solution Approach 1:
The patent applies preliminary action by examining a predetermined portion of the signal before full decoding to determine whether the signal is ciphered. This preliminary check allows the device to make an informed decision about whether to proceed with full decoding, thereby avoiding unnecessary processing and reducing power consumption while maintaining security through selective ciphering.
3Reliability
If all SACCH data blocks are decoded with deciphering, then security is maintained, but processing efficiency decreases due to unnecessary decoding cycles
Solution Approach 1:
The patent applies preliminary action by examining a predetermined portion of the signal before full decoding to determine whether the signal is ciphered. This preliminary check allows the device to make an informed decision about whether to proceed with full decoding, thereby avoiding unnecessary processing and reducing power consumption while maintaining security through selective ciphering.
Solution Approach 2:
The patent applies partial action by examining only a predetermined portion of the signal rather than the entire data block. This partial examination is sufficient to determine whether the signal is ciphered, allowing the device to avoid unnecessary full decoding cycles and improve processing efficiency while maintaining security.
Data Source
AI summary
Selective deciphering of a received signal, as taught herein, provides a number of advantages, including greater efficiency through the elimination or at least reduction of wasted decoding cycles. The technique, such as practiced in a user equipment or other wireless communication device, capitalizes on the advantageous recognition herein that the demodulation results obtained for at least some types of received data blocks may be inspected or otherwise evaluated for characteristic patterns that are indicative of whether the data block was or was not ciphered for transmission. That evaluation informs the selective deciphering decision.