Sidelink Reference Signal Power Control via Offset Parameters
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Solution Overview
Problem
Current technologies do not specify how to perform transmission power control for sidelink Channel State Information Reference Signal (CSI-RS) and sidelink Phase Tracking Reference Signal (PTRS) in New Radio (NR) sidelink communication.
Innovation Solution
A terminal is equipped with a control unit that sets the transmit power for sidelink reference signals to a specific value, either the same as or different from the transmit power for data, and a transmitting unit that applies these power values during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission power control for sidelink reference signals is not specified, then device complexity is reduced, but measurement precision and communication reliability deteriorate
Solution Approach 1:
The patent applies parameter changes by introducing a power offset parameter (e.g., powerOffsetForReferenceSignal) that adjusts the transmit power of reference signals relative to data. This parameter can be configured by higher layers or determined based on resource allocation, enabling flexible power control for CSI-RS and PTRS without complex device architecture changes.
Solution Approach 2:
The patent implements dynamic power control where the reference signal power is adjusted based on real-time conditions such as resource allocation (resourceGrantInfo), configured grant parameters, and power offset configurations. This allows the system to adapt power levels dynamically while maintaining straightforward device implementation.
2Measurement precision
If reference signal power is increased to improve measurement accuracy, then measurement precision improves, but energy consumption increases
Solution Approach 1:
The patent uses parameter changes to control reference signal power through configurable offsets (powerOffsetForReferenceSignal, powerOffsetForPTRS) that adjust power levels based on channel conditions and resource allocation, rather than always transmitting at maximum power. This enables energy-efficient operation while maintaining measurement accuracy when needed.
Solution Approach 2:
The patent applies partial action by transmitting reference signals at elevated power only when necessary for accurate channel estimation, rather than continuously at high power. The power offset parameters enable selective power boosting for reference signals compared to data transmission, reducing overall energy consumption while maintaining measurement precision when required.
Data Source
AI summary
A terminal includes a control unit that sets, when data transmitted on a sidelink shared channel is frequency division multiplexed with a sidelink reference signal in a symbol to which the sidelink shared channel is mapped, a first value of α transmit power for transmitting the reference signal to a same value as or a different value from a second value of α transmit power for transmitting the data; and a transmitting unit that transmits the reference signal and the data, wherein the transmitting unit applies the first value of the transmit power to the reference signal and applies the second value of the transmit power to the data.