Phase Shift Reference Signals for LTE Control Signal Overhead Reduction
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Solution Overview
Problem
Current scheduling schemes in LTE systems, such as dynamic scheduling and semi-persistent scheduling, face inefficiencies due to excessive control signal overhead, leading to decreased data transfer efficiency and insufficient control signal regions, particularly in scenarios with diverse utility forms including MTC devices.
Innovation Solution
A transmission method that uses phase shift reference signals based on the identifier of the receiving device to determine the transmission destination, allowing for efficient data transmission without adding control signals to the data, and allocating radio resources to groups of devices with similar characteristics for continuous use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic scheduling or semi-persistent scheduling is used in LTE systems, then data transmission can be performed, but control signal overhead increases and data transfer efficiency decreases
Solution Approach 1:
The patent extracts the destination identification function from traditional control signals and implements it through phase shift reference signals. By removing destination information from control signals and encoding it in the phase shifts of reference signals, the system reduces control signal overhead while maintaining data transfer efficiency
Solution Approach 2:
The reference signals serve multiple functions: they provide channel estimation for data demodulation and simultaneously convey destination identification information through phase shifts. This multi-functionality eliminates the need for separate control signals for destination identification, reducing overall control signal overhead
2Measurement precision
If control signals are added to data for destination identification, then transmission destination can be determined, but control signal region becomes insufficient
Solution Approach 1:
Reference signals are designed to perform dual functions: channel estimation for data demodulation and destination identification through phase shift encoding. This eliminates the need for separate control signals dedicated to destination identification, preserving control signal region while maintaining destination detection accuracy
Solution Approach 2:
The patent changes the phase shift parameter of reference signals to encode destination identification information. By modulating the phase of reference signals based on destination identifiers, the system achieves accurate destination detection without requiring additional control signal resources
3Productivity
If phase shift reference signals are used for destination identification, then control signal overhead is reduced, but destination detection accuracy must be maintained
Solution Approach 1:
The patent encodes destination identification information by changing the phase shift parameter of reference signals. Each destination corresponds to a specific phase shift value, enabling accurate destination detection while reducing control signal overhead and improving data transfer efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances data transfer efficiency by eliminating control signal overhead and enabling flexible timing for data transmission, while maintaining high accuracy in destination detection, thus addressing the inefficiencies of existing scheduling schemes.
Implementation Method 1
transmits a second signal obtained by performing phase modulation on a reference signal based on identification information of the reception device
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3E
AI summary
Disclosed is a technique in which efficient scheduling is performed based on current and future diversification in a utility form of a portable telephone terminal. A transmission device according to the disclosure includes a transmission section that, when data is transmitted to a reception device, transmits a first signal that includes the data and a second signal generated by performing, based on identification information of the reception device, phase modulation on a known signal.