Bridge Device Protocol Conversion for Cable to IP Access
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Solution Overview
Problem
Cable network providers face challenges in allowing IP-based user devices to access content typically restricted to cable-type video format devices, such as set-top boxes, due to protocol incompatibilities and encryption differences.
Innovation Solution
A bridge device performs protocol conversion, transcoding, transrating, decryption, and re-encryption to facilitate communication between cable networks and IP-based devices, enabling access to cable content on various IP devices without the need for a full video decoder or composite video outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full set-top box with video decoder and composite video outputs is used, then content access and decoding capability are improved, but device complexity and hardware cost increase
Solution Approach 1:
The patent extracts the video decoding function from the bridge device and relocates it to the IP-based user device. The bridge device only performs protocol conversion and content delivery, while the user device handles decoding and display. This separation reduces the bridge device's hardware complexity while maintaining content access capability.
Solution Approach 2:
The bridge device serves as an intermediary between the cable network and IP-based user devices. It performs protocol conversion (QAM to IP packets) and content delivery without requiring full decoding capabilities, enabling IP devices to access cable content while keeping the bridge device relatively simple.
2Adaptability or versatility
If protocol conversion and encryption operations are performed by the bridge device, then compatibility between cable network and IP devices is improved, but processing complexity increases
Solution Approach 1:
The patent segments the processing functions between the bridge device and user devices. The bridge device handles protocol conversion (QAM to IP), conditional access decryption, and content delivery. The user device handles IP protocol processing, additional decryption if needed, and video decoding. This segmentation distributes processing complexity appropriately.
Solution Approach 2:
The bridge device acts as a protocol mediator, converting cable network protocols (QAM modulation, conditional access encryption) into IP-based protocols that user devices can understand. This intermediary function improves compatibility without requiring the user device to directly handle cable-specific protocols.
3Reliability
If the bridge device performs decryption and re-encryption operations, then content protection security is improved, but processing time and complexity increase
Solution Approach 1:
The bridge device performs decryption of conditional access encryption and re-encryption with authorized service domain encryption in advance, before content delivery to the user device. This preliminary processing ensures content protection security is maintained while allowing the user device to receive already-processed content, reducing its processing burden.
Solution Approach 2:
The bridge device serves as a security intermediary, managing the decryption and re-encryption process. It validates user credentials, decrypts conditional access encrypted content, applies authorized service domain encryption, and delivers the protected content to authorized devices. This intermediary approach maintains security while distributing processing tasks.
Data Source
AI summary
Methods and apparatus for connecting, e.g., bridging, a cable network to other networks and/or devices is described. A bridge device facilitates the distribution of cable provider content to end users operating IP based devices. The bridge device performs one of more of the following: interface protocol conversions, user device controlled tuner selection, transcoding of data, transrating of a data stream, decryption in accordance with a conditional access protocol and re-encryption in accordance with an authorized service domain protocol.