Base Station Demodulation Reference Signal Scrambling
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Solution Overview
Problem
In wireless communication systems, the use of the same demodulation reference signal for data signals transmitted by different base stations can lead to interference, deteriorating the quality of the signal received by terminals and impeding transmission efficiency in cooperative communication scenarios.
Innovation Solution
The implementation of a system where base stations generate and multiplex demodulation reference signals for data signals using unique scramble codes based on first and second scramble IDs, notified to terminals, to enhance channel estimation and reduce interference, allowing efficient control of demodulation reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same demodulation reference signal is used by different base stations for cooperative communication, then frequency usage efficiency is improved, but signal quality deteriorates due to interference
Solution Approach 1:
The patent applies local quality by making the demodulation reference signal locally unique to each base station through the introduction of scramble IDs. While the overall reference signal structure remains standardized, the specific signal content is differentiated by base station identifier, allowing each base station to transmit its own unique reference signal without interfering with others using the same frequency resources.
Solution Approach 2:
The patent changes the parameter of the demodulation reference signal by introducing scramble IDs as a new distinguishing parameter. This allows the reference signals to be mathematically transformed into unique sequences based on the base station's identifier, thereby enabling frequency reuse while maintaining signal distinguishability and reducing interference.
2Measurement precision
If demodulation reference signals are multiplexed into data signals before precoding, then channel estimation accuracy is improved, but interference from multiple base stations increases
Solution Approach 1:
By incorporating the base station's scramble ID into the demodulation reference signal that is multiplexed with data, each base station creates a locally unique reference signal. This allows the terminal to distinguish between reference signals from different base stations even when they are multiplexed together, maintaining channel estimation accuracy while reducing inter-base station interference.
Solution Approach 2:
The patent modifies the demodulation reference signal by applying a scrambling transformation using the base station's scramble ID. This parameter change ensures that even when reference signals from multiple base stations are multiplexed in the same time-frequency resources, they remain distinguishable through their unique scrambled sequences, thereby reducing interference while preserving measurement precision.
Data Source
AI summary
A base station is provided in which a terminal efficiently controls a demodulation reference signal for a data signal transmitted from the base station in a wireless communication system in which the base station and the terminal communicates with each other. The base station that performs a communication with the terminal includes a data signal generation unit that generates a data signal for terminal, and a demodulation reference signal for a data signal multiplexing unit that multiplexes a demodulation reference signal for a data signal, which is a known signal for demodulating the data signal, into the data signal. The scramble code included in the demodulation reference signal for the data signal is generated based on a first scramble ID and a second scramble ID that are notified from the base station to the terminal.