Broadcast Signal Subframe Configuration for TDD Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in integrating broadcast and communication systems efficiently, particularly in managing broadcast channels with different characteristics and optimizing control information sharing, which is not adequately addressed in existing technologies.
Innovation Solution
The implementation of a cellular broadcasting and communication system that uses an Intelligent Scheduling Agent (IMA) to map multiple application bit streams into underlying wireless channels based on system control information and feedback from receivers, employing adaptable frame structures and synchronized packet distribution networks to coordinate base stations for simultaneous broadcasting, thereby optimizing channel scheduling and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If broadcast and communication systems are integrated, then system capacity and performance are enhanced, but device complexity increases due to the need to manage different channel characteristics and optimize control information sharing
Solution Approach 1:
The patent segments the wireless communication system into distinct broadcast channels and communication channels, each with dedicated resource allocation and control mechanisms. The broadcast channel handles multicast traffic separately from unicast communication channels, allowing independent optimization of each channel type while managing overall system complexity through structured division of functions.
Solution Approach 2:
The patent implements a universal frame structure that can accommodate multiple channel types (broadcast and communication channels) within a single time division duplex framework. This multi-functional approach allows the system to handle diverse traffic patterns and channel characteristics through a unified scheduling mechanism, enhancing system capacity without proportionally increasing complexity.
2Productivity
If time division duplex configuration is used for uplink and downlink OFDM symbols, then channel scheduling is optimized, but flexibility in supporting different traffic patterns is reduced
Solution Approach 1:
The patent introduces dynamic subframe configuration where the proportion of broadcast subframes versus communication subframes can be adjusted based on current traffic conditions. The system can dynamically reconfigure which subframes are dedicated to broadcast traffic and which are available for communication traffic, providing flexibility to adapt to varying traffic patterns while maintaining efficient time division duplex scheduling.
Solution Approach 2:
The patent employs parameter changes in the frame structure, allowing the system to modify the number of broadcast subframes, communication subframes, and their respective time allocations based on traffic demands. This enables the system to optimize channel scheduling for different traffic patterns by adjusting structural parameters rather than requiring complete reconfiguration.
3Reliability
If multiple base stations simultaneously broadcast using same time/frequency resources, then signal quality is improved through signal combining, but interference management becomes more difficult
Solution Approach 1:
The patent implements single frequency network technology where multiple base stations simultaneously broadcast the same content on the same time and frequency resources. This merging of transmissions from multiple base stations allows receiver signal combining, improving signal quality and coverage. The patent manages the resulting interference through coordinated control mechanisms that synchronize broadcasts across the network.
Data Source
AI summary
A mobile station may comprise a receiver to receive, from a base station, a broadcast signal indicating a TDD configuration of uplink OFDM symbols and downlink OFDM symbols. The receiver may receive an indication of a symbol range and a subchannel range for use in transmission of CQI feedback. The mobile station may receive first downlink data and transmit first uplink data, using the TDD configuration, wherein the first uplink data comprises CQI feedback information transmitted in accordance with the symbol range and the subchannel range. The receiver may receive second downlink data, from the base station, on a different frequency as the first uplink data is transmitted, while the first uplink data is transmitted.