Uplink Power Control via RSRP Measurements for Interference Mitigation
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Solution Overview
Problem
Existing solutions for controlling uplink interference caused by aerial User Equipment devices (UEs), such as drone UEs, are less than ideal and require distinguishing between drone UEs and terrestrial UEs, which can lead to ineffective power control and interference mitigation.
Innovation Solution
A network node configures wireless devices to measure Reference Signal Received Power (RSRP) for both serving and neighbor cells, adjusts the target receive power based on RSRP differences, and signals power corrections to reduce interference by using height-dependent power control parameters for uplink power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing solutions distinguish between drone UEs and terrestrial UEs for power control, then interference mitigation can be targeted, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent applies homogeneity by using the same power control mechanism for all UEs regardless of whether they are drone or terrestrial. The base station uniformly adjusts target receive powers based on RSRP measurements without requiring any classification or distinction between UE types, thereby simplifying the system while still mitigating interference from aerial UEs.
Solution Approach 2:
The RSRP-based power control mechanism serves multiple functions: it controls uplink interference, manages power allocation, and adapts to different UE scenarios (drone and terrestrial) simultaneously. This universal approach eliminates the need for separate identification and handling of drone UEs, reducing system complexity.
2Object-affected harmful factors
If RSRP-based power control adjustment is implemented, then uplink interference is reduced, but additional signaling and measurement overhead is introduced
Solution Approach 1:
The system uses self-service by leveraging existing RSRP measurements that UEs already perform for channel quality indication and link adaptation. These measurements are repurposed for power control adjustments without requiring additional dedicated measurement configurations or signaling channels, thereby minimizing overhead.
Solution Approach 2:
The patent implements feedback by using RSRP measurements to dynamically adjust target receive powers. The base station receives RSRP information from UEs and uses this feedback to control uplink interference, creating a closed-loop system that adapts to changing channel conditions while utilizing already-available measurement data.
Data Source
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AI summary
Embodiments of a network node for a cellular communications network are disclosed. In some embodiments, the network node comprises a radio interface and processing circuitry operable to configure a wireless device to measure Reference Signal Received Power (RSRP) for both a serving cell of the wireless device and one or more neighbor cells of the wireless device, receive resulting reporting information from the wireless device, adjust a target receive power for the wireless device based on the reporting information, determine a power correction for the wireless device based on the adjusted target receive power for the wireless device, and signal the power correction to the wireless device. Embodiments of a method of operation of a network node as well as embodiments of a wireless device and a method of operation thereof are also disclosed.