Hierarchical RF Modulation for Mixed QoS Data Transmission
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Solution Overview
Problem
Current RF communication systems face challenges in efficiently transmitting diverse types of information with varying bandwidth, latency, and error rate requirements across different services, necessitating improved modulation techniques to enhance bandwidth utilization and service diversity.
Innovation Solution
The implementation of hierarchical modulation, where different data is assigned to multiple modulation layers based on reliability criteria, allowing for simultaneous transmission of information using a carrier RF signal, with lower order modulation layers being more reliable than higher order layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hierarchical modulation is used to transmit multiple data types simultaneously, then bandwidth utilization and service diversity are improved, but system complexity increases
Solution Approach 1:
The patent segments the single RF carrier signal into multiple hierarchical modulation layers (first modulation layer and second modulation layer), each carrying different data types with different QoS requirements. This segmentation allows simultaneous transmission of multiple services over the same bandwidth while maintaining manageable complexity through structured layer assignment
Solution Approach 2:
The patent adds a modulation layer dimension to the traditional single-carrier system by implementing hierarchical modulation with distinct layers (e.g., robust lower-order modulation and less robust higher-order modulation). This dimensional expansion enables multiple data streams to coexist on one carrier frequency, improving bandwidth utilization without requiring additional frequency resources
2Speed
If higher order modulation layers are used to increase data rate, then transmission speed is improved, but reliability decreases
Solution Approach 1:
The patent applies local quality by assigning different modulation robustness characteristics to different hierarchical layers based on the specific QoS requirements of each data type. Critical data (voice, control signals) are placed on more robust lower-order modulation layers, while non-critical data (video, file transfers) are placed on higher-order modulation layers with greater data rates but lower reliability
Solution Approach 2:
The patent changes the modulation order parameter across different hierarchical layers, transitioning from lower-order modulation (higher reliability, lower data rate) in the first layer to higher-order modulation (lower reliability, higher data rate) in the second layer. This parameter variation allows the system to optimize the trade-off between speed and reliability for different data types simultaneously
3Adaptability or versatility
If multiple modulation layers are assigned to different users, then service diversity and user capacity are improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent performs preliminary action by pre-assigning specific data types and QoS requirements to specific hierarchical modulation layers before transmission. This predetermined layer assignment structure enables receiving devices to efficiently detect and measure signals by knowing in advance which layer contains which type of data, reducing detection complexity despite the presence of multiple layers
Data Source
AI summary
The present invention employs hierarchical modulation to simultaneously transmit information on different modulation layers using a carrier RF signal. Initially, first data to be transmitted is assigned to a first modulation layer and second data is assigned to a second modulation layer. In one embodiment of the present invention, the first and second data are assigned based on reliability criteria. The first and second modulation layers are hierarchical modulation layers of the carrier RF signal. Once assigned, the first data is transmitted using the first modulation layer of the carrier RF signal and the second data is transmitted using the second modulation layer of the carrier RF signal. In one embodiment of the present invention, information may be transmitted to one end user using one modulation layer, and information may be transmitted to a different end user using a different modulation layer.