Dual-Stream Broadcast Transmission for Low-Power Mobile TV Reception
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Solution Overview
Problem
The high power consumption of demodulators in mobile devices receiving digital television broadcasts according to the ATSC A/53 standard, as they continuously process large data quantities, is not significantly reduced by reducing data transfer rates for mobile devices.
Innovation Solution
A method where a transmitter separates data into two streams, with the first stream transmitted continuously and the second stream transmitted intermittently, allowing receivers to enter a power-saving mode between bursts, reducing power consumption in mobile devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted continuously according to ATSC A/53 standard, then high data transfer rate is provided, but power consumption requirements of the demodulator become significant
Solution Approach 1:
The patent segments the data transmission into two distinct streams: a first data stream transmitted continuously for terrestrial TV receivers, and a second data stream transmitted in bursts for mobile receivers. This segmentation allows mobile devices to receive data at high rates when needed while entering power-saving modes between bursts, thus resolving the contradiction between maintaining high data transfer rates and reducing power consumption requirements.
2Reliability
If the receiver continuously processes large data quantities, then data is received without interruption, but the demodulator cannot enter power saving mode
Solution Approach 1:
The patent implements dynamic transmission patterns where the second data stream is transmitted in intermittent bursts rather than continuously. This allows the receiver to dynamically switch between active reception during bursts and power-saving modes between bursts, achieving both reliable data reception when needed and reduced power consumption during idle periods.
3Use of energy by moving object
If time intervals between data portions are increased to allow power saving mode, then power consumption is reduced, but data transfer rate decreases
Solution Approach 1:
The patent segments data transmission into two streams with different timing characteristics. The first stream maintains continuous transmission for terrestrial TV, while the second stream uses intermittent bursts for mobile receivers. This segmentation allows each stream to be optimized independently, enabling power-saving intervals in the mobile stream without compromising the continuous data transfer rate of the terrestrial stream.
Solution Approach 2:
The patent applies different transmission qualities to different data streams based on their intended receivers. The first data stream uses continuous high-quality transmission for terrestrial TV, while the second data stream uses intermittent burst transmission optimized for mobile receivers that can tolerate longer intervals between data portions, thus achieving local optimization of both power consumption and data transfer rate.
Data Source
AI summary
An implementation exits a power saving mode for fixed and periodic active periods of time to receive a separate burst transmission from a first stream during each of the corresponding active periods of time. The first stream is received at a first-stream burst data rate. The first stream includes data configured to be displayed at a first playback rate that is substantially less than the first-stream burst data rate. During the active periods of time, data is received from a second stream at a second-stream rate. The second stream includes data configured to be displayed at a second playback rate that is substantially the same as the second-stream rate. After receiving each of the burst transmissions from the first stream during the active periods of time, the power saving mode is entered for corresponding fixed and periodic power-saving periods of time while waiting for another burst from the first stream.