Sidelink DMRS Indication for Dynamic Antenna Port Configuration
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing demodulation reference signals (DMRS) for sidelink communication, particularly in scenarios involving multiple antenna ports and dynamic configurations, which can lead to inefficiencies and suboptimal performance.
Innovation Solution
A wireless device receives DMRS patterns and lengths from a base station and transmits sidelink control information (SCI) indicating the DMRS pattern and antenna ports, enabling dynamic and efficient DMRS configuration for sidelink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dynamic DMRS configuration is implemented for sidelink communication, then signal demodulation performance is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic DMRS configuration where the DMRS pattern (type 1 or type 2) and antenna port indices are determined dynamically based on SCI indicators rather than fixed pre-configuration. The receiving device dynamically identifies the DMRS pattern and antenna ports used by the transmitting device based on received SCI messages, enabling adaptive optimization of demodulation performance while managing complexity through standardized procedures.
Solution Approach 2:
The patent changes key DMRS parameters (pattern type and antenna port index) from fixed to variable based on SCI indicators. The DMRS pattern is selected from multiple options (type 1 with 2 ports, type 1 with 4 ports, type 2 with 2 ports, type 2 with 4 ports) and the specific configuration is indicated through SCI fields, allowing parameter optimization for different channel conditions while maintaining manageable complexity through standardized parameter sets.
2Adaptability or versatility
If multiple antenna ports are supported for sidelink DMRS, then communication versatility is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal DMRS framework that supports multiple antenna ports (2 or 4 ports) and multiple pattern types (type 1 or type 2) within a single standardized structure. The same SCI indication mechanism and DMRS generation procedures handle all configurations, providing multi-functionality without requiring separate processing paths for each configuration type.
Solution Approach 2:
The patent enables dynamic selection of antenna port configurations through SCI indicators, allowing the system to adapt the number of antenna ports (2 or 4) and pattern type based on communication requirements. This dynamic approach provides versatility for different MIMO scenarios while managing complexity through unified dynamic control rather than multiple static configurations.
3Adaptability or versatility
If DMRS pattern and antenna port indication is included in SCI, then adaptability is improved, but information overhead increases
Solution Approach 1:
The patent uses compact parameter encoding in SCI to indicate DMRS configuration. Instead of transmitting full DMRS sequences or detailed configuration messages, the patent uses concise indicator fields (e.g., 1-bit or 2-bit fields) to specify DMRS pattern type and antenna port indices, achieving high adaptability with minimal overhead through efficient parameter representation.
Solution Approach 2:
The patent transmits only the essential indication information needed to identify the DMRS configuration rather than complete configuration data. The receiving device uses these partial indications (pattern type indicator and antenna port indicator) combined with pre-configured knowledge to fully reconstruct the DMRS parameters, achieving adaptability with reduced overhead by transmitting only what is strictly necessary.
Data Source
AI summary
A wireless device may receive, from a base station, one or more radio resource control (RRC) messages. The one or more RRC messages may indicate a plurality of demodulation reference signal (DMRS) patterns and a length of a DMRS for each of the plurality of DMRS patterns. The wireless device may determine a DMRS pattern of a physical sidelink shared channel (PSSCH) based on the plurality of DMRS patterns and the length of the DMRS in the DMRS pattern. The wireless device may transmit, to a second wireless device, sidelink control information (SCI) indicating the DMRS pattern of the PSSCH and a number of one or more antenna ports for the DMRS in the DMRS pattern.