Uplink Shared Channel PTRS Control via RNTI Type
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Solution Overview
Problem
In next-generation mobile communication systems, particularly in NR, the control of phase tracking reference signal (PTRS) transmission during uplink shared channel transmission is not adequately addressed, leading to potential inaccuracies in phase noise correction and communication quality.
Innovation Solution
A terminal is configured to determine the existence of PTRS transmission based on the type of RNTI used for downlink control information that schedules the uplink shared channel, ensuring appropriate PTRS transmission by clearly defining the signal or channel corresponding to the RNTI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PTRS transmission is controlled based on RNTI type in random access procedure, then phase noise correction accuracy is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent changes the control parameter from generic uplink grant-based PTRS control to RNTI-type-specific PTRS control. By identifying the RNTI type (TC-RNTI vs. C-RNTI) in the downlink control information, the system selectively controls PTRS transmission presence and density, achieving accurate phase noise correction while maintaining manageable complexity through parameter-based differentiation.
Solution Approach 2:
The patent applies different PTRS transmission strategies to different RNTI types. For TC-RNTI (temporary identifier used during random access), PTRS transmission is controlled differently compared to C-RNTI (permanent identifier). This localized quality approach ensures optimal phase tracking for each random access scenario without requiring complex global control mechanisms.
2Reliability
If PTRS transmission is always present in uplink shared channel, then communication reliability is improved, but resource overhead increases
Solution Approach 1:
Instead of always transmitting PTRS in every uplink shared channel, the patent implements partial action by selectively transmitting PTRS based on RNTI type identification. When TC-RNTI is detected in random access procedures, PTRS transmission is controlled appropriately; when C-RNTI is detected, different PTRS control applies. This ensures sufficient phase tracking reliability only where needed, reducing unnecessary resource overhead.
3Device complexity
If PTRS transmission control is simplified without RNTI-based differentiation, then device complexity is reduced, but phase noise correction accuracy deteriorates
Solution Approach 1:
The patent creates a universal control mechanism that handles multiple RNTI types through a unified RNTI identification approach. The same downlink control information structure and PTRS control logic work for both TC-RNTI and C-RNTI cases, providing multi-functionality without requiring separate complex control systems for each RNTI type. This maintains low device complexity while achieving accurate phase noise correction.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a transmitting section that transmits an uplink shared channel, and a control section that determines, when transmitting the uplink shared channel, existence of transmission of a phase tracking reference signal (PTRS) based on a type of a RNTI (Radio Network Temporary Identifier) used for downlink control information that schedules the uplink shared channel.