UE Cell Selection via Signal Strength Rate of Change
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Solution Overview
Problem
Wireless communication networks face connectivity issues due to the transient nature of mobile user equipment (UE) connections with radio units (RUs) as they move, leading to potential loss of service, especially in latency- and throughput-intensive applications like autonomous driving, where handovers between RUs can introduce latency and impact performance.
Innovation Solution
The implementation of intelligent UE selection mechanisms that choose a cell based on the rate of change of signal quality and proximity to dynamically tracked locations of mobile RUs, allowing for stable connectivity by prioritizing connections with MRUs over SRUs, thereby minimizing handovers and maintaining consistent service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover mechanisms are used between radio units, then network connectivity is maintained, but latency increases and service performance deteriorates due to frequent handovers
Solution Approach 1:
The patent applies dynamics by making the RU selection criteria adaptive rather than static. The UE dynamically selects RUs based on real-time rate of change of signal strength, allowing the system to adapt to mobile conditions. This dynamic approach reduces unnecessary handovers while maintaining connectivity, resolving the contradiction between reliability and latency.
Solution Approach 2:
The patent changes the selection parameter from static signal strength to dynamic rate of change of signal strength. By using the derivative of signal strength over time as the selection criterion, the system identifies RUs with stable connections, thereby reducing handover frequency and latency while maintaining network connectivity.
2Device complexity
If UEs connect to stationary radio units (SRUs), then network infrastructure is simplified, but connectivity stability deteriorates for mobile UEs due to transient connections
Solution Approach 1:
The patent introduces dynamics into the connection selection process by considering the rate of change of signal strength. This allows mobile UEs to dynamically identify and connect to RUs (including mobile RUs) that provide stable connections, rather than being forced to connect only to static SRUs. The dynamic selection mechanism maintains connection stability without requiring complex infrastructure changes.
Solution Approach 2:
The patent enables UEs to self-select the most appropriate RU based on their own mobility characteristics and signal strength dynamics. The UE autonomously determines which RU provides the most stable connection by evaluating the rate of change of signal strength, eliminating the need for complex network-side control while improving connection stability for mobile devices.
3Stability of the object's composition
If mobile radio units (MRUs) are deployed to improve mobility support, then connection stability improves, but device complexity and network management difficulty increase
Solution Approach 1:
The patent implements a self-service mechanism where UEs autonomously evaluate and select RUs based on signal strength dynamics. This distributes the intelligence from the network side to the UE side, simplifying network management despite the presence of multiple MRUs. The UE's autonomous selection capability eliminates the need for complex network-side coordination, resolving the contradiction between connection stability and network complexity.
Solution Approach 2:
The patent employs feedback mechanisms where UEs continuously monitor signal strength and its rate of change, using this feedback to dynamically select RUs. This feedback-driven approach enables stable connections with MRUs while maintaining simple network architecture, as the selection logic resides in the UE rather than requiring complex network management systems.
4Measurement precision
If frequent handovers are performed to maintain optimal signal strength, then signal quality is improved, but service performance deteriorates due to handover-related latency
Solution Approach 1:
The patent changes the selection parameter from instantaneous signal strength to the rate of change of signal strength over time. This parameter transformation allows the system to identify RUs with stable signal characteristics, reducing the frequency of handovers while maintaining adequate signal quality. The result is improved service performance without sacrificing signal quality, as handovers occur only when necessary.
Solution Approach 2:
The patent applies partial action by performing handovers only when the rate of change of signal strength indicates a deteriorating connection, rather than continuously handovering to maintain maximum signal strength. This selective approach maintains adequate signal quality while minimizing handover frequency, thereby preserving service performance and reducing latency.
Data Source
AI summary
A system described herein may provide for the selection of a cell of a wireless telecommunications network to which a User Equipment (“UE”) should connect. The UE may receive radio frequency (“RF”) signals from a group of cells (e.g., implemented by Radio Units (“RUs”)) of a radio access network (“RAN”), and may determine signal strengths or measures of channel quality associated with the RF signals. For example, the UE may determine a rate of change of signal strengths over time associated with each cell, a differential rate of change, or some other value, and may select the cell based on the respective rates of change. For example, the UE may select a particular cell which exhibits the lowest differential rate of change of signal strengths over time. A particular cell may be implemented, for example, by a mobile RU mounted on a vehicle that maintains relatively close proximity to UE.