Transport Block Modulation Adaptation for Heterogeneous Networks
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Solution Overview
Problem
Current mobile communication systems face challenges in adapting to time-varying wireless fading channels, leading to inefficiencies in system throughput and resource wastage due to the use of fixed modulation and coding schemes, especially in heterogeneous networks with varying channel conditions.
Innovation Solution
Implementing multiple modulating and coding schemes for each transport block, allowing different modulating and coding schemes to be used across overlapping and non-overlapping physical resource blocks, with the transmitting node determining these schemes based on interference conditions, channel quality, and resource allocation, and the receiving node demodulating accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fixed modulation and coding scheme is used for all physical resource blocks, then the device complexity is reduced, but the system throughput deteriorates due to inability to adapt to varying channel conditions
Solution Approach 1:
The patent divides the physical resource blocks into overlapping and non-overlapping sets, and applies different modulation and coding schemes to each set. This segmentation allows the system to use high-order modulation for non-overlapping blocks (where interference is lower) and more robust modulation for overlapping blocks (where interference is higher), thereby improving overall system throughput while maintaining manageable complexity through structured classification.
Solution Approach 2:
The patent implements local quality by assigning different modulation and coding schemes to different physical resource blocks based on their specific interference conditions and channel quality. Each block or group of blocks receives tailored modulation parameters optimized for its local characteristics, rather than using a uniform scheme across the entire resource allocation, thus optimizing throughput for each local region.
2Productivity
If high-order modulation with higher transmission rate is used, then the system throughput is improved under ideal channel conditions, but the communication reliability deteriorates under deep fading conditions
Solution Approach 1:
The patent dynamically selects modulation and coding schemes based on real-time channel quality feedback. The base station receives CQI feedback from user equipment and adjusts the modulation order and coding rate accordingly for different physical resource blocks. This dynamic adaptation allows the system to use high-order modulation when channel conditions are good (maximizing throughput) and switch to more robust low-order modulation when channel conditions deteriorate (maintaining reliability).
Solution Approach 2:
The patent changes the modulation and coding parameters adaptively based on channel conditions. When the signal-to-noise ratio is high, the system switches to high-order modulation (e.g., 64QAM, 256QAM) with higher coding rates to maximize throughput. When the channel experiences deep fading or high interference, the system transitions to lower-order modulation (e.g., QPSK, 16QAM) with lower coding rates to ensure reliable communication, thus resolving the contradiction between throughput and reliability.
3Reliability
If low-order modulation with lower transmission rate is used to ensure communication reliability, then the communication reliability is improved, but the system throughput deteriorates under high signal-to-noise ratio conditions
Solution Approach 1:
The patent segments physical resource blocks into overlapping and non-overlapping categories and applies different modulation strategies to each. For non-overlapping blocks with lower interference, the system uses high-order modulation to maximize throughput. For overlapping blocks with higher interference, the system uses more robust low-order modulation to ensure reliability. This segmentation enables the system to achieve high throughput overall while maintaining reliability where needed.
Solution Approach 2:
The patent implements local quality by optimizing modulation parameters for each physical resource block or group of blocks based on its specific interference characteristics. Blocks with low interference receive high-order modulation for maximum throughput, while blocks with high interference receive robust low-order modulation for reliability. This localized optimization ensures that the system achieves high throughput in good conditions while maintaining reliability in poor conditions, resolving the contradiction between the two objectives.
4Reliability
If transmission power is increased to overcome time-varying channel characteristics, then the communication reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent changes the modulation and coding parameters adaptively based on channel conditions, which indirectly affects the required transmission power. By using higher-order modulation with higher coding rates in good channel conditions, the system achieves reliable communication at lower power levels. When channel conditions deteriorate, the system switches to more robust modulation and lower coding rates, which maintains reliability without requiring excessive power increases. This parameter adaptation provides a more energy-efficient alternative to simply increasing transmission power.
Data Source
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AI summary
A method and apparatus for transmitting a transport block, and a method and apparatus for receiving a transport block are provided. The method includes: acquiring, by a transmitting node, a data signal obtained by performing a process of a physical layer procedure on the transport block, where the physical layer procedure at least includes channel coding and modulating, one transport block has multiple modulating and coding schemes, the multiple modulating and coding schemes include multiple modulating schemes, or multiple coding schemes, or multiple modulating schemes and multiple coding schemes; and transmitting, by the transmitting node, the data signal and a control signal corresponding to the data signal to a receiving node.