Multicarrier Wireless Frame Intermixing for Power-Efficient Video Broadcasting
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Solution Overview
Problem
In wireless communication systems, the continuous reception of video broadcasting streams by mobile stations consumes significant power, and sharing air link resources with data applications leads to delays for control messages, causing system performance issues due to the exclusive use of resources by video streams.
Innovation Solution
The transmission of video streams is configured as bursts, allowing mobile stations to turn off transceiver circuitry between bursts, and using available data resources within video bursts to transmit data packets and control information, with special scheduling signals announcing video burst information to mobile stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video streams are transmitted continuously to ensure uninterrupted broadcasting, then video quality is maintained, but power consumption in mobile stations increases significantly
Solution Approach 1:
The patent implements periodic video burst transmissions with intermittent gaps instead of continuous transmission. Mobile stations are configured to wake up at predetermined intervals to receive video bursts, then enter sleep mode during gaps. This periodic action pattern maintains video broadcasting reliability while dramatically reducing power consumption by limiting active reception to specific time windows.
Solution Approach 2:
The patent segments the continuous video stream into discrete video bursts separated by gaps. Each video burst contains a complete video frame or sequence of frames, allowing mobile stations to receive essential video content in chunks rather than requiring continuous reception. This segmentation enables the system to maintain acceptable video quality while reducing the duty cycle of active transmission and reception.
2Reliability
If air link resources are exclusively allocated to video streams for efficient video delivery, then video quality of service is improved, but control message transmission delays increase
Solution Approach 1:
The patent merges video burst transmissions with control message transmissions by allowing control messages to be embedded within the video burst structure. Specifically, control messages can be transmitted in the gaps between video frames within a burst or multiplexed with video data. This combining approach ensures that control messages receive timely transmission without requiring separate dedicated resources, thus reducing control message delays while preserving video quality of service.
Solution Approach 2:
The patent implements dynamic resource allocation where the air link resources are flexibly shared between video bursts and control messages based on immediate system needs. During video burst transmission periods, resources are dynamically allocated to video content, while during gaps or overhead portions, resources are dynamically switched to handle control messages. This dynamic allocation allows the system to respond swiftly to control requirements while maintaining efficient video delivery.
Data Source
AI summary
A method and apparatus for content multicasting and broadcasting and data unicasting in a broadband multicarrier wireless communication system. A base station is configured to transmit, and a mobile station is configured to receive, a sequence of consecutive frames. The frames comprise two types: frames containing time-frequency resources for content multicasting and broadcasting via a single frequency network, and frames containing time-frequency resources for data unicasting without the use of a single frequency network. The two types of frames are intermixed in accordance with an intermixing configuration pattern. The intermixing configuration pattern is indicated by a bit-map contained in a scheduling signal.