Wireless Receiver Decoding Media Content via Pre-stored Files
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Solution Overview
Problem
Wireless receivers face challenges in efficiently receiving and delivering decoding and decryption information for digital media content over-the-air, particularly in unidirectional broadcast links, which limits access to pay-per-view services and subscription channels without a stable connection for header file retrieval.
Innovation Solution
A method involving the reception of a programme information file (PIF) that links to remote decoding or decryption files, allowing wireless receivers to pre-store these files independently of the broadcast channel, enabling decoding and decryption of media content at a later time using a wireless data link like GPRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If decoding information is delivered via one-to-one network connection, then decoding accuracy is improved, but network dependency increases
Solution Approach 1:
The system performs preliminary action by delivering and storing decoding information (header files) at the wireless receiver before the actual media content broadcast. This allows the receiver to have decoding capabilities ready in advance, eliminating the need for real-time network connection during content playback and enabling operation in areas with poor or no network coverage.
2Ease of operation
If header files are delivered in advance, then service accessibility is improved, but memory usage increases
Solution Approach 1:
The system applies local quality by selectively delivering decoding information only for specific media content that users have requested or are subscribed to, rather than storing all possible decoding information. The receiver stores only the relevant header files needed for its subscribed services, optimizing memory usage while maintaining service accessibility.
3Productivity
If unidirectional broadcast link is used, then transmission efficiency is improved, but information delivery flexibility deteriorates
Solution Approach 1:
The system segments the information delivery into two parts: (1) decoding information delivered in advance via unidirectional broadcast to improve transmission efficiency, and (2) user-specific service requests delivered via return channel to enable flexible service selection. This segmentation allows the system to combine the efficiency of unidirectional broadcast with the flexibility of bidirectional communication.
Data Source
AI summary
A wireless receiver, in the form of a mobile telephone, includes a DAB receiver and a GSM/GPRS transceiver which enables bi-directional point-to-point data communications via a service provider. The DAB receiver is arranged to receive media data from an over-the-air broadcast channel, the media data primarily representing television and radio streams. In order that the streams can be decoded and decrypted by media playing software on the wireless receiver, a provisioning operation is employed to provide NSC header files and DRM licenses to users in response to them making content requests. The header files and licenses are sent over a separate data channel and in advance of the broadcast content.