Uplink Interference Avoidance Under Open Loop Power Control
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Solution Overview
Problem
5G wireless communication systems face challenges in uplink interference avoidance, particularly under open loop power control conditions, where existing methods struggle to effectively manage interference between adjacent systems without compromising user experience or increasing operational complexity.
Innovation Solution
A centralized control system is implemented to identify and mitigate uplink interference by adjusting the maximum uplink power (P_MAX) of user equipment (UE) connected to eNBs, using a combination of interference estimation and power adjustment techniques, including interference-aware scheduling and propagation models, to reduce interference while maintaining quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open loop power control is used to simplify power management, then device complexity is reduced, but uplink interference into external systems cannot be effectively controlled
Solution Approach 1:
The patent introduces a feedback mechanism where the network side obtains feedback information from user equipment regarding their power control status and uses this feedback to adjust power limits. This resolves the contradiction by adding targeted feedback only when needed (when interference thresholds are approached) rather than implementing continuous closed-loop control for all scenarios, thus managing interference effectively while maintaining relative simplicity.
Solution Approach 2:
The patent implements preliminary action by proactively identifying user equipment that may cause interference to external systems and preemptively adjusting their power limits before actual interference occurs. The network side calculates potential interference based on propagation models and power control parameters, then adjusts power limits in advance to prevent interference threshold violations.
2Reliability
If uplink power is increased to meet SNR requirements, then communication reliability is improved, but co-channel interference into external systems increases
Solution Approach 1:
The patent applies local quality by differentiating power control strategies for different user equipment based on their specific characteristics and interference potential. Instead of uniform power control, the network identifies individual UEs that pose interference risks to external systems and applies targeted power limits to those specific devices while allowing other UEs to transmit at higher powers for reliability.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the maximum power limit parameter (P_MAX) for specific user equipment based on calculated interference levels. The network modifies power control parameters individually for UEs approaching interference thresholds, allowing the system to optimize the trade-off between maintaining communication reliability and preventing co-channel interference into external systems.
3Object-generated harmful factors
If centralized control is implemented to manage interference, then interference avoidance effectiveness is improved, but system operational complexity increases
Solution Approach 1:
The patent implements self-service by enabling user equipment to autonomously manage their own power control. Each UE independently calculates its power control parameters, reports to the network, and adjusts its transmission power without requiring complex centralized coordination. The network provides guidelines and thresholds but relies on individual UE self-management to reduce overall system complexity.
Data Source
AI summary
Various embodiments disclosed herein provide for facilitating uplink interference avoidance. According an embodiment, a system can comprise identifying network node devices and communication devices operating within a boundary located adjacent to an external system. The system can comprise determining communication settings of the communication devices that are engaged in an uplink session with the network node devices. The system can comprise estimating a total uplink interference into the external system based on a propagation model and an uplink power control value determined from the communication settings. The system can comprise in response to determining that the total uplink interference is greater than a defined value and in response to determining that the network node devices employed an open loop power control, requesting the network node devices to initiate an update to an uplink power limit (e.g., facilitate uplink power reduction) of the communication devices engaged in the uplink session with the network node devices.