Turbo Code Data Alignment for Multi-Cell Demodulation Stability
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Solution Overview
Problem
Conventional simultaneous transmitting methods in radio communication systems, such as LTE and LTE-Advanced, face demodulation performance degradation due to fluctuations in signal quality when turbo-coded data signals are transmitted from multiple cells, as each cell sets its own frequency shift for CRS and multiplexes control and data signals differently, leading to inconsistent resource allocation and inadequate error correction.
Innovation Solution
A radio communication apparatus that classifies signal components into all-cell common and cell-dependent resources, with the first half of coded data arranged on the all-cell common resource and the second half on the cell-dependent resource, using resource arrangement information to optimize data transmission and minimize demodulation performance degradation by ensuring more systematic bits are on the all-cell common resource for macro-diversity effect and handling signal quality differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each cell sets its own frequency shift for CRS and multiplexes control and data signals independently, then each cell can optimize its own transmission, but demodulation performance degrades due to signal quality fluctuations when multiple cells transmit simultaneously
Solution Approach 1:
The patent segments the transmission resources into two distinct types: all-cell common resources (where all cells transmit identical signals with the same resource arrangement) and cell-dependent resources (where each cell can independently optimize transmission). This segmentation resolves the contradiction by allowing independent optimization at the cell level while ensuring reliable demodulation through the common resource portion that provides consistent signal quality across all cells.
2Reliability
If the same resource arrangement is used across all cells for simultaneous transmission, then demodulation performance is stabilized, but flexibility in optimizing each cell's transmission is reduced
Solution Approach 1:
The patent divides transmission resources into all-cell common resources and cell-dependent resources. The all-cell common resources ensure demodulation performance stability by using identical resource arrangements across all cells, while the cell-dependent resources provide flexibility for each cell to optimize its transmission independently based on local conditions.
Solution Approach 2:
The patent applies local quality by allowing different resource arrangement strategies for different resource types. For all-cell common resources, a uniform arrangement is applied to ensure stability, while for cell-dependent resources, each cell can apply locally optimized arrangements suited to its specific transmission conditions.
3Productivity
If different resource arrangements are used by different cells, then each cell optimizes its transmission efficiency, but throughput degrades due to inconsistent signal quality at the receiver
Solution Approach 1:
The patent segments resources into all-cell common and cell-dependent portions. The all-cell common resources ensure consistent signal quality and prevent throughput degradation by providing a baseline of uniform transmission, while the cell-dependent resources maintain each cell's transmission efficiency through local optimization.
Solution Approach 2:
The patent merges the benefits of uniform transmission (from all-cell common resources) and local optimization (from cell-dependent resources) into a single transmission framework. This combination ensures both consistent signal quality for throughput maintenance and local efficiency for transmission optimization.
Data Source
AI summary
A data alignment method capable of preventing degradation in demodulation performance due to variation in signal qualities when a data signal to which a Turbo code is applied is transmitted simultaneously from a plurality of cells. The method divides signal components to be used for data alignment into resources common to all the cells and resources dependent on the cells and transmits encoded and rate-matched data with the first half thereof aligned to the resources common to all the cells and the second half thereof aligned to the resources dependent on the cells.