5G Reference Signal Transmission Scheme for Dynamic TDD Adaptation
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Solution Overview
Problem
The existing Cell-Specific Reference Signal (CRS) in 4G mobile communication networks is not suitable for the high-speed and low-latency requirements of the 5G environment, particularly in dynamic Time Division Duplex (TDD) scenarios, necessitating a new reference signal transmission scheme for improved performance.
Innovation Solution
A new reference signal transmission scheme is proposed, utilizing a Demodulation Reference Signal (DM-RS) and a Tracking Reference Signal (TRS) that dynamically adjust their transmission time and duration based on data channel symbols, employing frequency division multiplexing (FDM) across multiple antenna beams to ensure efficient data channel demodulation and beam-tracking in 5G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed reference signal transmission scheme (CRS) is used in each subframe, then coverage and compatibility are maintained, but adaptability to dynamic TDD and high-speed low-latency services deteriorates
Solution Approach 1:
The reference signal transmission scheme transitions from a fixed structure to a dynamic one where the transmission timing and resources of reference signals (DM-RS and TRS) are flexibly adjusted based on data channel symbol positions and beamforming requirements, enabling adaptation to dynamic TDD while maintaining manageable complexity through standardized procedures
Solution Approach 2:
The invention changes key parameters of reference signal transmission including time domain position, frequency domain resources, and transmission periodicity based on traffic conditions and beamforming needs, allowing the system to adapt to varying service requirements without fundamentally redesigning the reference signal structure
2Measurement precision
If reference signals are transmitted continuously in every subframe, then measurement precision and channel estimation accuracy are improved, but resource efficiency and latency deteriorate
Solution Approach 1:
The invention implements periodic transmission of tracking reference signals (TRS) at configured intervals rather than in every subframe, while demodulation reference signals (DM-RS) are transmitted only when data channels are present, achieving a balance between maintaining adequate channel estimation accuracy and improving resource efficiency
Solution Approach 2:
Tracking reference signals are transmitted in advance at predetermined intervals to pre-establish channel state information before data transmission, reducing the need for continuous reference signal transmission and thereby improving resource efficiency while maintaining measurement precision
3Reliability
If multiple reference signals are transmitted for different antenna beams, then beam-tracking capability and communication reliability are improved, but resource consumption and system complexity increase
Solution Approach 1:
The invention segments reference signal resources by function, dividing them into demodulation reference signals (DM-RS) for data channel demodulation and tracking reference signals (TRS) for beam tracking, allowing each type to be optimized and transmitted independently based on specific needs, thereby improving reliability while controlling resource consumption
Solution Approach 2:
The invention designs reference signals with multi-functionality where TRS can serve both tracking purposes and provide channel state information for multiple beams, and DM-RS can be configured for different antenna ports, reducing the total quantity of reference signals needed while maintaining comprehensive beam-tracking capability
Data Source
AI summary
Disclosed is technology for supporting high-speed and low-latency performance in a 5G environment through implementation of a new reference signal transmission scheme appropriate for the 5G environment, that is, a mobile communication network environment for supporting high-speed and low-latency communication, which will appear afterwards.