Distributed MIMO Repeater Gain Control for Path Loss Compensation
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Solution Overview
Problem
The issue of repeater gain control for device collaboration in distributed MIMO systems has not been fully addressed in 5G NR networks, particularly in scenarios where base stations receive signals from both user equipment and repeaters via distributed high-rank MIMO transmitters/receivers, leading to challenges in amplifying and forwarding radio signals effectively.
Innovation Solution
A method and apparatus for determining repeater gain based on compensation values for path losses on both direct and indirect links, using uplink power control factors and target power level differences to optimize signal transmission in distributed MIMO systems, involving a repeater that amplifies and forwards signals between a base station and user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If repeater amplifies radio signals to extend coverage, then signal coverage is improved, but path loss compensation becomes complex in distributed MIMO systems
Solution Approach 1:
The patent segments the path loss compensation into two separate components: first path loss (between repeater and UE) and second path loss (between repeater and base station). This segmentation allows each path loss to be compensated independently through separate compensation values, simplifying the overall control mechanism while maintaining comprehensive coverage extension capability
Solution Approach 2:
The patent introduces dynamic parameter changes by adjusting repeater gain based on calculated path loss compensation values. The repeater gain is modified according to the sum of first and second path loss compensation values, enabling adaptive signal amplification that responds to changing channel conditions while maintaining simplified control through parameter-based adjustment
2Productivity
If repeater forwards signals from both UE and base station, then distributed MIMO performance is improved, but power control accuracy deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the repeater calculates path loss compensation values based on received signals from both UE and base station. The repeater determines first path loss from UE signals and second path loss from base station signals, then uses these measurements to adjust its forwarding gain, creating a closed-loop feedback system that maintains power control accuracy in distributed MIMO operations
Solution Approach 2:
The patent applies preliminary action by pre-calculating path loss compensation values before signal forwarding. The repeater determines compensation values for both path losses in advance, then applies these pre-computed values to the repeater gain configuration, ensuring accurate power control is established before actual signal transmission occurs
Data Source
AI summary
Examples pertaining to repeater gain control for device collaboration in distributed MIMO systems are described. An apparatus (e.g., a repeater) may determine a first compensation value for a first path loss on a first link between the apparatus and a UE, and determine a second compensation value for a second path loss on a second link between the apparatus and a network node of a wireless network. The apparatus may also determine a repeater gain for uplink power control according to the first compensation value and the second compensation value. The apparatus may further forward a radio signal from the UE to the network node according to the repeater gain.