Reference Signal Power Control for 5G Channel Demodulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The legacy frame structure of 3GPP LTE systems is unable to meet the reduced latency requirements of 5G technology, particularly for real-time control and tactile internet applications, as it fails to achieve the necessary 1 ms data transmission latency, which is 10 times lower than the legacy data latency.
Innovation Solution
A method and apparatus for user equipment in a wireless communication system that involves receiving information including total power values and power differences of reference signals, performing channel estimation, and determining the number of ranks for demodulating control and data channels, thereby reducing signaling overhead and enabling efficient channel demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the legacy frame structure of 3GPP LTE is used, then the system maintains backward compatibility and existing infrastructure, but it fails to meet the reduced latency requirements of 5G technology
Solution Approach 1:
The patent applies dynamics by making the frame structure adjustable and flexible rather than fixed. It introduces configurable parameters including variable TTI lengths (supporting both 1ms and longer durations), dynamic slot structure selection, and adaptive resource allocation that can change based on traffic requirements. This allows the system to switch between legacy-compatible modes and low-latency optimized modes as needed.
Solution Approach 2:
The patent implements parameter changes by modifying fundamental frame structure parameters: TTI duration (reducing from fixed 1ms to variable including shorter slots), subcarrier spacing adjustments, and resource block configurations. These parameter changes enable the system to achieve 10x latency reduction while maintaining compatibility through configurable parameter sets that can be selected based on service requirements.
2Measurement precision
If multiple reference signals are transmitted for control and data channels, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent merges control channel reference signals (CRS) and data channel reference signals (DM-RS) into a unified reference signal structure. By combining these previously separate signaling elements, the system maintains the channel estimation benefits of multiple reference signals while reducing the total signaling overhead through consolidated signal transmission and shared resource allocation.
Solution Approach 2:
The patent creates a universal reference signal that serves multiple functions simultaneously - it can be used for both control channel demodulation and data channel demodulation, and supports both legacy and new service requirements. This multi-functional reference signal reduces overhead by eliminating the need for separate dedicated reference signals for different purposes.
Data Source
AI summary
A method of demodulating a channel by a user equipment in a wireless communication system, include the steps of receiving information including a total power value of reference signals (RSs), a power difference value between power of a first RS for control information and a power of a second RS for data among the RSs, a port number of an additional RS, a cyclic shift (CS) value of the additional RS, and a power value of the additional RS and a power difference value between second RSs for the control information, performing channel estimation on a first channel on which the additional RS is received and a second channel received from a port identical to the port number of the additional RS and the second channel on which the first RS to which a CS value different from the CS value of the additional RS is applied is received, obtaining a power difference value between the power of the additional RS and the power of the first RS based on the channel estimation of the first and the second channels, and determining a number of rank of the second RS based on the total power value of the RSs, the power value of the additional RS, a power difference value between the power of the first RS and the power of the second RS, the obtained power difference value between the power of the additional RS and the power of the first RS, and the power difference value between the power of the second RSs.