UE Pathloss Reference Signal Power Control for Full Duplex Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently mitigating crosslink interference (CLI) in full duplex (FD) networks, particularly due to latency in adjusting transmission power based on reports from downlink (DL) user equipment (UE), which affects the performance and efficiency of FD operations.
Innovation Solution
Implementing a method where a UE determines its transmission power based on a pathloss (PL) reference signal (RS) received from another UE, allowing autonomous adjustment of transmission power in FD resources to minimize CLI, thereby reducing latency and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power adjustment is based on reports from downlink user equipment, then transmission power control can be achieved, but latency increases and communication efficiency decreases
Solution Approach 1:
The user equipment autonomously determines its transmission power by measuring the pathloss reference signal received from another UE, without requiring network entity intervention or reporting. This self-service mechanism eliminates the latency associated with uplink reports and downlink acknowledgments, directly resolving the contradiction between reliable power control and low latency
Solution Approach 2:
The pathloss reference signal is transmitted in advance in the downlink or sidelink, allowing the receiving UE to calculate pathloss before the actual uplink transmission. This preliminary calculation enables immediate transmission power adjustment without waiting for network feedback, reducing latency while maintaining power control accuracy
2Productivity
If autonomous transmission power adjustment is implemented, then latency is reduced and communication efficiency improves, but system complexity increases
Solution Approach 1:
The UE uses its existing receiver and processor capabilities to measure the pathloss reference signal and calculate transmission power autonomously. This approach leverages already-present device functions rather than adding complex new system infrastructure, improving communication efficiency while minimizing the increase in overall system complexity
Solution Approach 2:
The pathloss reference signal acts as an intermediary that carries pathloss information from the transmitting UE to the receiving UE. This intermediary mechanism enables autonomous power control through simple signal measurement and calculation, avoiding the need for complex direct negotiation or control protocols between UEs
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a first UE (e.g., aggressor UE) receives PL RS from a second UE (e.g., victim UE). The first UE determines a PL associated with the PL RS (e.g., based on a transmission power of the PL RS). The first UE performs one or more transmissions, in one or more full duplex (FD) resources, one or more transmissions with a transmission power that is based at least in part on the PL associated with the PL RS (e.g., PL may be used to determine a maximum transmission power that functions as a power control constraint on a power control algorithm that sets the transmission power). In this manner, CLI at the second UE may be reduced. In some designs, a network entity (e.g., base station) configures the PL RS.