Multi-Purpose Reference Signal for NR V2X Resource Overhead Reduction
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Solution Overview
Problem
The existing LTE V2X technology faces challenges in resource management due to high reference signal overhead, which becomes even more pronounced in the 5G NR V2X system that requires additional functions like unicast communication, frequency offset estimation, and channel measurement.
Innovation Solution
A signal processing method that involves sending a multi-purpose reference signal (MP-RS) from a first communication device to a second communication device, which supports automatic gain control, frequency offset estimation, channel state information measurement, and channel estimation for multiple ports using a single signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate reference signals are used for different functions (AGC, frequency offset estimation, channel measurement), then each function can be performed accurately, but the reference signal overhead and resource consumption increase significantly
Solution Approach 1:
The patent applies multi-functionality by designing a single reference signal that can simultaneously serve multiple purposes: automatic gain control (AGC), frequency offset estimation, and channel measurement. This is achieved by configuring the reference signal with specific properties (such as using Zadoff-Chu sequences with different cyclic shifts) that enable it to carry multiple functions, thereby reducing reference signal overhead while maintaining measurement accuracy for all required functions
Solution Approach 2:
The patent merges multiple separate reference signal functions into a single unified reference signal structure. Instead of transmitting separate reference signals for AGC, frequency offset, and channel measurement, the invention combines these functions into one reference signal that can be processed to extract all necessary information, thus reducing resource consumption and signal overhead
2Adaptability or versatility
If multiple new signals or channels are introduced to support unicast communication, frequency offset estimation, and channel measurement in NR V2X, then the system can meet new communication requirements, but the system complexity and signaling overhead increase
Solution Approach 1:
The patent applies multi-functionality by enabling the existing reference signal to perform multiple new functions required for NR V2X unicast communication, including frequency offset estimation, channel measurement, and support for multiple ports. This approach maintains communication versatility while avoiding the need to introduce multiple new separate signals or channels, thereby reducing system complexity
Solution Approach 2:
The patent introduces dynamic port indication mechanisms where the same reference signal can be configured for different ports dynamically through higher-layer signaling. This allows the system to adapt to different communication scenarios (broadcast, groupcast, unicast) without introducing static separate signals for each scenario, reducing overall system complexity while maintaining versatility
3Reliability
If separate reference signals are allocated for each port in multi-port communication, then each port can be distinguished and measured independently, but the resource consumption and time-frequency overhead increase
Solution Approach 1:
The patent applies local quality by assigning different local properties (such as different cyclic shifts of the same Zadoff-Chu sequence) to different ports within the same reference signal structure. This allows each port to be independently identified and measured through its unique local characteristic, while all ports share the same time-frequency resources, thereby maintaining port distinction capability without increasing overall resource consumption
Solution Approach 2:
The patent resolves port distinction by moving from time-frequency dimension separation to sequence/cyclic shift dimension separation. Instead of allocating separate time-frequency resources for each port, the invention uses different cyclic shifts of the same base sequence to distinguish ports, effectively adding a new dimension (sequence property) for port differentiation while conserving time-frequency resources
Data Source
AI summary
A signal processing method, a device and a communication device are provided. A signal processing method, applied to a first communication device and including: a first communication device sending a first reference signal to a second communication device; where the first reference signal is used for an automatic gain control measurement of at least two ports of the first reference signal and at least one of: a frequency offset estimation; a channel state information measurement; or a channel estimation.