PTRS Time Density Control for UCI on PUSCH Without Data
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Solution Overview
Problem
The existing technologies for future radio communication systems, such as NR, lack a comprehensive method to determine the time domain density of phase tracking reference signals (PTRS) when uplink control information is transmitted using an uplink shared channel without data multiplexing, leading to potential deterioration in communication quality.
Innovation Solution
A user terminal is equipped with a control section that determines the time density of PTRS based on whether the modulation and coding scheme (MCS) index included in the downlink control information falls within a certain range, and a transmitting section that transmits the PTRS accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTRS transmission is controlled based on MCS index in existing LTE systems, then communication quality is maintained for standard uplink transmissions, but communication quality deteriorates when UCI is transmitted on PUSCH without data multiplexing because MCS index determination is not defined
Solution Approach 1:
The patent extends the existing MCS index-based PTRS control mechanism to cover both traditional uplink data transmissions and the special case of UCI transmissions on PUSCH without data. By making the control mechanism universal, it now handles multiple transmission types through a unified approach, eliminating the gap where PTRS control was undefined for UCI-only transmissions.
Solution Approach 2:
The patent enables the system to self-determine the appropriate PTRS time domain density by using the MCS index field already present in the DCI for scheduling UCI on PUSCH without data. The existing DCI structure and MCS indexing mechanism serve themselves to control PTRS transmission, eliminating the need for additional signaling or separate control procedures.
2Reliability
If a comprehensive method for determining PTRS time domain density is established for all transmission types, then communication quality improves for edge cases like UCI on PUSCH without data, but system complexity increases due to additional determination rules
Solution Approach 1:
The patent applies the existing MCS index-based control mechanism universally across different transmission types including UCI on PUSCH without data, avoiding the need for separate control logic for different cases and thereby minimizing additional complexity.
Solution Approach 2:
The system uses the MCS index field already present in the DCI structure to self-determine PTRS parameters, leveraging existing signaling resources rather than introducing new complex control mechanisms or additional signaling overhead.
Data Source
AI summary
A terminal is disclosed including a processor that determines, when retransmission of a side channel in a communication between a plurality of terminals is performed, a modulation order for the retransmission of the side channel by using a MCS table based on side control information; a transmitter that transmits the side channel based on the determined modulation order, and a receiver that receives downlink control information including at least a UL-SCH indicator field, wherein the processor, if retransmission of an uplink shared channel is performed, determines a time density of a phase tracking reference signal (PTRS) based on whether a modulation and coding scheme (MCS) index is larger than a certain value, and wherein the transmitter transmits the PTRS. In other aspects, a radio communication method, and a system are also disclosed.