OFDMA Broadcast Service Data Segmentation and Time-Division Multiplexing
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Solution Overview
Problem
Conventional OFDMA wireless communication systems face challenges in transmitting and receiving broadcast services, including mixed data encoding, short transmission time periods, and inability to provide unique performance for each service, leading to poor reception quality and limited time diversity.
Innovation Solution
A method for separately coding, interleaving, and modulating each broadcast service, followed by time-division-multiplexing and segmenting into minimum transmission units, allowing for independent data rates and reception of desired services, thereby enhancing time diversity and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If broadcast service data for multiple services is mixed and transmitted together, then transmission efficiency is improved, but reception quality deteriorates and unique service performance cannot be provided
Solution Approach 1:
The patent segments broadcast service data by service type, creating separate logical channels for different broadcast services. Each service's data is processed independently through separate coding, interleaving, and modulation processes, allowing receivers to selectively process only the services they need while maintaining overall system efficiency.
2Speed
If transmission time period is kept short, then system responsiveness is improved, but time diversity effect is insufficient and reception performance deteriorates
Solution Approach 1:
The patent dynamically adjusts the transmission time period based on channel conditions and service requirements. By making the transmission timing adaptive rather than fixed, the system can extend transmission duration when time diversity is needed while maintaining quick response when channel conditions are good, thus resolving the contradiction between responsiveness and reception performance.
3Device complexity
If mixed data encoding is used for multiple broadcast services, then device complexity is reduced, but adaptability to different service requirements deteriorates
Solution Approach 1:
The patent applies different encoding parameters, coding schemes, and modulation methods tailored to each broadcast service's specific requirements. Each service can have optimized characteristics such as error correction strength, data rate, and robustness level, allowing the system to adapt to diverse service needs while using a modular architecture that doesn't significantly increase overall complexity.
Data Source
AI summary
A method for providing two or more broadcast services in an orthogonal frequency division multiple access (OFDMA) wireless communication system. The method comprises the steps of separately receiving broadcast services to be transmitted, and independently performing coding, interleaving and modulation on the broadcast services according to a required quality for each of the broadcast services; segmenting each of the modulated broadcast signals into minimum transmission units; time-division-multiplexing the segmented broadcast service signals; configuring a frame comprising information on the broadcast service in physical layer transmission information transmitted together with the broadcast service; and transmitting the frame.