Two-Stage Scrambling for High-Rate Media Streaming
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Solution Overview
Problem
Current media streaming technologies fail to exploit high data rates available in small cells within macro cells, leading to inefficient content delivery and potential violations of streaming-related legal restrictions.
Innovation Solution
A two-stage scrambling mechanism is employed to facilitate media streaming at high data rates within small cells, where multimedia content is scrambled until ready for consumption, ensuring compliance with legal restrictions by controlling the de-scrambling process through time-varying decryption keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If media streaming is delivered at high data rates through small cells, then content delivery speed is improved, but legal restrictions on content consumption may be violated
Solution Approach 1:
The encryption key is divided into multiple segments distributed across different network entities. The mobile device receives content at high speed but cannot decrypt it without collecting all key segments from multiple sources, which takes time. This segments the decryption process into multiple steps, ensuring legal compliance while maintaining high delivery speed.
Solution Approach 2:
A key management system acts as an intermediary between the content delivery system and the mobile device. This intermediary controls and regulates the distribution of decryption key segments, ensuring that content consumption complies with legal restrictions while allowing high-speed content transfer.
2Reliability
If traditional streaming methods are used in macro cells, then legal restrictions are maintained, but high data rate availability in small cells is not exploited
Solution Approach 1:
The system dynamically adapts its operation mode based on the user's location and network conditions. When a mobile device enters a small cell, the system transitions from traditional streaming to high-speed download with segmented key distribution. This dynamic adjustment allows the system to exploit high data rates in small cells while maintaining legal compliance through controlled key distribution.
Solution Approach 2:
The system changes the delivery parameter from streaming to download when detecting small cell connectivity, and adjusts the encryption key distribution parameters accordingly. By changing these parameters dynamically based on network conditions, the system optimizes content delivery efficiency while maintaining legal compliance.
3Reliability
If multimedia content is scrambled until ready for consumption, then legal restrictions are enforced, but de-scrambling process complexity increases
Solution Approach 1:
Instead of using a single complex de-scrambling process, the system segments the decryption key into multiple simpler parts that are distributed separately. The mobile device performs multiple simple key collection and assembly operations rather than one complex de-scrambling operation, reducing overall process complexity while maintaining strong content protection.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
A system (26) and method (40) for media streaming In a scenario where very high bitrate wireless service is available within a macro cell (10) through small cells (12, 14). When a mobile device (22) is in a small cell, a base station (20) may download the multimedia content onto the mobile device at the high bitrate instead of streaming the content at a low bitrate. The mobile device cannot misuse the content made available Through the download because its ability to de-scramble the downloaded information is made time dependent by a two-stage scrambling process at the base station that keeps the information scrambled until it is ready to be consumed. The base station withholds from the mobile device information related to de-scrambling of the received content until the appropriate time. Such withheld information includes time-varying decryption keys, which control the timing of decryption and are supplied to the mobile device in a temporally sequential maimer.