Relay Station Routing Layered Data to Multiple Receivers
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Solution Overview
Problem
Existing multi-layer multi-hop wireless systems are limited by their ability to transmit data to only one receiving station, which restricts their applications and does not effectively manage user diversity and channel conditions in cellular networks.
Innovation Solution
A method and radio network architecture that routes data in multiple layers through different paths to multiple receiving stations, utilizing relay stations for enhanced spatial stream multiplexing and constellation multiplexing, with hierarchical modulation and coding to prioritize data transmission based on channel quality, allowing simultaneous transmission to multiple users with varying channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted to only one receiving station in multi-layer multi-hop wireless systems, then the transmission reliability for that specific user is improved, but the system versatility and user diversity support deteriorate
Solution Approach 1:
The data stream is segmented into multiple layers (first layer and second layer) with different priorities and quality requirements. The first layer contains essential data that can be decoded independently, while the second layer contains additional quality-enhancing data. This segmentation allows the system to serve multiple users simultaneously by routing different layers to different receiving stations based on their channel conditions and service requirements.
Solution Approach 2:
The relay station is designed with multi-functionality to handle both first layer and second layer data routing. It can simultaneously route first layer data to one receiving station via the first path while routing second layer data to another receiving station via the second path, thereby supporting multiple users and applications within a single network infrastructure.
2Reliability
If relay stations are used to re-send data with higher signal level, then the signal power distribution in the cell is improved, but the device complexity and equipment requirements increase
Solution Approach 1:
The relay station processes different data layers separately through segmentation. It receives the combined signal, separates the first layer and second layer data, and routes them through different paths to different receiving stations. This segmentation approach simplifies the relay station's processing requirements compared to handling all data uniformly, as each layer can be processed with appropriate complexity matched to its importance.
Solution Approach 2:
The system applies local quality by providing different quality levels of service to different users through the relay station. Users with good channel conditions receive both first and second layer data for high-quality service, while users with poor conditions receive only the first layer data for basic service. This local quality differentiation optimizes overall network performance without requiring the relay station to provide maximum quality to all users equally.
3Productivity
If multiple layers are routed through different paths to multiple receiving stations, then the spectrum efficiency and throughput are improved, but the system complexity and control difficulty increase
Solution Approach 1:
The data is segmented into hierarchical layers with clear functional distinctions. The first layer carries essential information that must be delivered to all users, while the second layer carries enhancement information for users with good channel conditions. This segmentation enables simplified control logic at the relay station, where routing decisions are based on layer type rather than complex real-time channel analysis, thereby managing system complexity while maintaining high throughput.
Solution Approach 2:
The system performs preliminary actions by pre-establishing routing rules for different data layers before actual data transmission. The relay station is pre-configured to route first layer data to users needing basic service and second layer data to users capable of receiving enhanced service. This preliminary configuration reduces real-time control complexity during data transmission while still achieving high spectrum efficiency and throughput.
Data Source
AI summary
A radio network with at least one sending station, at least one relay station and at least a first and a second receiving station transmits data organized in at least a first and a second layer, where at least the first layer is routed via a first path from the base station to the relay station to a first receiving station and at least the second layer is routed to the second receiving station via a different second path.