Dynamic Phase Tracking Reference Signal Presence Detection in URLLC
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Solution Overview
Problem
In wireless communication systems, particularly in ultra-reliable and low-latency (URLLC) applications, there is a need to dynamically determine the presence of a phase tracking reference signal (PT-RS) and the number of PT-RS antenna ports to be used, especially when new types of Radio Network Temporary IDs (RNTIs) are employed.
Innovation Solution
The user equipment (UE) determines the presence of a PT-RS based on specific RNTIs, such as C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI. It then selects the appropriate modulation and coding scheme table and sets the number of PT-RS antenna ports based on the transmitted precoding matrix indicator and transmit rank indicator values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new types of RNTI are introduced for URLLC applications, then the system can support ultra-reliable and low-latency communication requirements, but the complexity of determining PT-RS presence and configuration increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting PT-RS presence and antenna port configuration based on the specific RNTI type detected. When URLLC-RNTI or MCS-C-RNTI is detected, the system changes the PT-RS configuration parameters (presence indicator and antenna port count) according to pre-configured mappings, enabling adaptive optimization for different communication scenarios while maintaining reliable URLLC performance
Solution Approach 2:
The system implements dynamics by making PT-RS configuration flexible and adaptable rather than fixed. The user equipment dynamically determines PT-RS presence and antenna port configuration based on the detected RNTI type, allowing the system to adapt to varying URLLC requirements in real-time while managing complexity through standardized determination procedures
2Loss of energy
If PT-RS presence is dynamically determined based on RNTI type, then the system can optimize resource usage and reduce overhead, but the processing requirements and computational load increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mapping relationships between RNTI types and PT-RS configurations. The network pre-establishes the rules for determining PT-RS presence and antenna port settings based on different RNTI types, allowing the user equipment to perform simple lookups rather than complex real-time calculations, thus reducing computational load while maintaining automated optimization
Solution Approach 2:
The system optimizes resource usage by dynamically changing PT-RS configuration parameters based on detected RNTI types. When certain RNTI types are detected, the system adjusts PT-RS presence and antenna port settings to match the specific communication requirements, reducing unnecessary signal overhead while maintaining adequate tracking performance
3Measurement precision
If the number of PT-RS antenna ports is increased for codebook transmissions, then the phase tracking accuracy improves, but the signal overhead and resource consumption increase
Solution Approach 1:
The patent applies local quality by making PT-RS antenna port configuration specific to local conditions (RNTI type and transmission mode). Rather than using a uniform configuration, the system adjusts the number of antenna ports locally based on the detected RNTI type and codebook transmission requirements, ensuring adequate phase tracking accuracy where needed while minimizing overhead elsewhere
Solution Approach 2:
The system optimizes the balance between accuracy and overhead by dynamically changing the number of PT-RS antenna ports based on transmission parameters. For codebook-based transmissions with specific TPMI and TRI values, the system adjusts antenna port count to achieve necessary phase tracking accuracy while avoiding excessive resource consumption in scenarios where lower precision suffices
Data Source
AI summary
A user equipment wireless communication device in a wireless communication environment receives a signal from the network that includes a radio network temporary ID. From the radio network temporary ID, the user equipment is capable of determining whether a phase tracking reference signal is present based on the radio network temporary ID. If any of these are identified by the radio network temporary ID, then the user equipment determines that a phase tracking reference signal is present. After the user equipment has determined that the phase tracking reference signal is present, the user equipment can then determine which phase tracking reference signal antenna ports are to be used based on the values of the transmitted precoding matrix indicator value and the transmit rank indicator.