Sidelink Power Control Using Pathloss-Based Backoff in FR2
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively managing sidelink power control in frequency range 2 (FR2), particularly in maintaining reliable and efficient communication across higher frequency bands, where propagation loss and interference are significant.
Innovation Solution
The implementation of a user equipment (UE) with a transceiver and processor that receives sidelink reference signals, calculates filtered receive power, and determines transmission power based on pathloss, using spatial domain transmission filters to optimize sidelink channel transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to overcome propagation loss in FR2, then communication reliability is improved, but energy consumption and interference increase
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on measured pathloss and channel conditions. The UE calculates pathloss using reference signal receive power and compares it against thresholds to determine appropriate power backoff values, thereby optimizing power consumption while maintaining communication reliability in FR2
Solution Approach 2:
The patent implements a feedback mechanism where the UE measures channel conditions (pathloss) and uses this information to adjust transmission power. The power control decision is based on feedback from channel quality measurements, allowing the system to adapt power levels to actual propagation conditions rather than using fixed high power
2Reliability
If transmission power is increased to mitigate propagation loss, then signal quality is improved, but interference to other users increases
Solution Approach 1:
The patent adjusts transmission power parameters dynamically based on channel conditions and pathloss measurements. By calculating appropriate power levels using measured RSRP and pathloss thresholds, the system transmits at the minimum necessary power to maintain signal quality, thereby reducing interference to other users in the FR2 band
Solution Approach 2:
The patent applies partial power transmission rather than maximum power. The UE determines whether to apply power backoff based on pathloss thresholds, transmitting at reduced power when channel conditions permit, thus achieving adequate signal quality while minimizing excessive transmission that would cause interference
3Productivity
If pathloss-based power control is implemented in FR2, then communication efficiency is improved, but calculation complexity increases
Solution Approach 1:
The patent implements a simplified power control mechanism that uses partial calculations based on threshold comparisons. Rather than continuously calculating precise power levels, the UE compares measured pathloss against predetermined thresholds to determine power backoff application, reducing computational complexity while maintaining communication efficiency in FR2
Data Source
AI summary
Methods and apparatuses for sidelink (SL) power control. A user equipment (UE) includes a transceiver configured to receive, from a second UE, a first sidelink (SL) reference signal (RS) and receive, from the second UE, information related to a transmit power for the first SL RS. The UE further includes a processor operably coupled to the transceiver. The processor is configured to calculate a first filtered RS receive power (RSRP) for the first SL RS, calculate a first pathloss for the first SL RS based on a difference between the transmit power and the first filtered RSRP, and determine, based on the first pathloss, a first power for a first SL channel. The transceiver is further configured to transmit, based on a first spatial domain transmission filter, the first SL channel using the first power. The first spatial domain transmission filter is associated with the first SL RS.