Bidirectional Bus for Active Security Subsystem Data Exchange
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Solution Overview
Problem
The flexibility and communication rate between a security subsystem and a primary processing system in terminals are limited due to the passive nature of the smart card, which can only respond to commands initiated by the communication processor, restricting data transmission and processing efficiency.
Innovation Solution
A terminal with a security subsystem and a primary processing system connected via a high-speed bidirectional bus, allowing both components to actively transmit data and operate in the same hierarchy, enabling full-duplex communication and parallel data exchange, thereby enhancing flexibility and communication rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the smart card is connected to the communication processor by using a contact and follows the ISO 7816 protocol, then the communication structure is simple and easy to implement, but the communication flexibility and rate are comparatively low
Solution Approach 1:
The patent replaces the mechanical contact-based communication interface with a wireless communication interface. The security subsystem communicates with the primary processing system through wireless signals rather than physical contacts, eliminating the limitations of contact-based protocols while maintaining secure data transmission. This substitution enables higher communication rates and greater flexibility without sacrificing implementation feasibility.
2Device complexity
If the smart card operates in a passive hierarchy where only the communication processor can initiate communication, then the system structure is simple, but the communication flexibility and data transmission主动性 are limited
Solution Approach 1:
The patent inverts the traditional passive security subsystem architecture by enabling the security subsystem to actively initiate communication with the primary processing system. Instead of only the processor being able to read data from the smart card, the security subsystem can now actively transmit data when needed, fundamentally changing the communication dynamics while maintaining manageable system complexity through standardized protocols.
Solution Approach 2:
The patent introduces dynamic communication capabilities where the security subsystem can transition between passive and active communication modes as needed. The system adapts its communication behavior based on operational requirements, allowing the security subsystem to initiate transmissions when data needs to be sent to the processor, thereby achieving high communication flexibility without excessive complexity.
3Device complexity
If the smart card can only transmit data after receiving a read command from the communication processor, then the communication protocol is simple, but the data transmission efficiency and communication rate are low
Solution Approach 1:
The patent implements preliminary action by enabling the security subsystem to prepare and buffer data for transmission in advance, rather than waiting for processor-initiated read commands. The security subsystem can proactively transmit data when ready, eliminating the waiting period inherent in traditional protocols and significantly improving data transmission efficiency while maintaining protocol simplicity through event-driven communication triggers.
Data Source
AI summary
A terminal includes a security subsystem, a baseband processor, and a first bidirectional bus coupled between the security subsystem and the baseband processor. The security subsystem is configured to manage at least one of data related to a user identity or data related to network security in wireless communication, and exchange the data with the baseband processor by using the first bidirectional bus. The baseband processor is configured to exchange the data with the security subsystem by using the first bidirectional bus, and implement wireless communication by using the data. The security subsystem and the baseband processor are in the same hierarchy. The security subsystem may proactively perform data transmission by using the first bidirectional bus.