Sidelink Path Loss Determination via Conditional Measurement Reports
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Solution Overview
Problem
The existing solutions for sidelink power control in 5G NR communications are unclear regarding the operation details and procedures for both receiving and transmitting user equipment (UEs), leading to issues with reporting reference signal received power (RSRP) and determining path loss, especially in scenarios where transmission power varies slot-by-slot and measurement reports may not align with reference signal transmission times.
Innovation Solution
The proposed solution involves methods for terminal devices to measure and report reference signals, determining path loss based on average received and transmission power within a time window, and using layer 3 filtering to improve measurement efficiency and accuracy, including criteria for deciding when to measure and report reference signals and transmission power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement reports are transmitted frequently to ensure accurate path loss determination, then path loss measurement precision is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The receiving terminal device performs preliminary actions by measuring and storing reference signal received power (RSRP) values in advance, then determines whether to transmit measurement reports based on pre-established report criteria. This preliminary measurement and evaluation process enables the transmitting terminal device to accurately determine path loss without requiring continuous frequent reporting, thus improving measurement precision while controlling processing complexity.
Solution Approach 2:
The system implements feedback mechanisms where the receiving terminal device transmits measurement reports containing RSRP values to the transmitting terminal device, which then uses this feedback information to determine path loss for power control. The feedback loop includes the transmitting terminal device adjusting transmission power based on the determined path loss, creating a closed-loop system that improves measurement accuracy while managing complexity through targeted feedback transmission.
2Reliability
If transmission power is adjusted frequently to optimize communication quality, then communication quality is improved, but power control complexity and latency increase
Solution Approach 1:
The system performs preliminary path loss determination using stored RSRP measurement values before adjusting transmission power. The transmitting terminal device calculates path loss based on pre-measured RSRP and historical transmission power data, then uses this predetermined path loss value to set transmission power for subsequent slots. This preliminary calculation approach enables timely power adjustment without introducing excessive complexity or latency.
Solution Approach 2:
The power control system dynamically adjusts transmission power based on determined path loss values while maintaining operational simplicity. The transmitting terminal device uses the determined path loss to calculate appropriate transmission power levels, and the system adapts to changing communication conditions through continuous path loss determination and power adjustment, improving communication quality while managing complexity through dynamic rather than static control.
3Measurement precision
If reference signals are transmitted continuously for accurate measurement, then measurement accuracy is improved, but energy consumption and interference increase
Solution Approach 1:
The receiving terminal device performs preliminary measurements of reference signals and stores the RSRP values for later use in path loss determination. By measuring reference signals in advance and storing the results, the system can determine accurate path loss values without requiring continuous reference signal transmission during the actual power control process, thus improving measurement accuracy while reducing energy consumption.
Solution Approach 2:
The system maintains continuity in the measurement process by having the receiving terminal device continuously monitor and store RSRP values, while the transmitting terminal device continuously determines path loss based on these stored values. This continuous action at the receiving end enables accurate path loss determination without requiring continuous reference signal transmission from the transmitting end, reducing overall energy consumption while maintaining measurement accuracy.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for sidelink power control. In a method for communication, a first terminal device generates a measurement report by measuring a reference signal from a second terminal device via a sidelink channel. The first terminal device determines, based on a report criterion, whether to transmit the measurement report to the second terminal device. In response to determining that the measurement report is to be transmitted, the first terminal device transmits the measurement report to the second terminal device, such that the second terminal device determines a path loss of the sidelink channel based on the measurement report. With the embodiments of the present disclosure, more effective and efficient measurement reports can be obtained and a path loss in a sidelink channel can be determined more accurately for transmission power control in a sidelink communication.