Unresponsive UE Detection via CSI Reports
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Solution Overview
Problem
Existing technologies face challenges in detecting unresponsive user equipment (UE) in cellular broadband communications, particularly when there is no data or high uplink interference, leading to inefficient use of physical resources and prolonged out-of-service times.
Innovation Solution
The system initiates receiving periodic channel state information (CSI) reports from the user equipment and, upon determining a defined number of consecutive missing CSI reports, initiates a user equipment release transaction, sending a context release request to the centralized unit of the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system waits for traditional data traffic or uplink signals to detect unresponsive UE, then false detections are reduced, but detection time is prolonged and resources are wasted
Solution Approach 1:
The system proactively requests CSI reports from UE before data traffic or uplink signals are needed for detection. By establishing a preliminary monitoring mechanism using periodic CSI requests, the system can detect unresponsive UE earlier in the communication flow, without waiting for data transmission opportunities or uplink grants, thus reducing out-of-service time while maintaining reliable detection through the predefined reporting mechanism
Solution Approach 2:
The system implements a feedback loop where it sends CSI requests to UE and monitors the returned CSI reports. This continuous feedback mechanism allows the system to detect UE responsiveness in real-time based on whether CSI reports are received within expected timeframes, enabling early detection without relying on data traffic patterns or uplink signal presence
2Reliability
If the system continuously monitors for UE responsiveness using traditional methods, then detection reliability is maintained, but physical resources are inefficiently used
Solution Approach 1:
Instead of continuous monitoring that wastes resources, the system implements periodic CSI request transmission at configured intervals. This periodic action allows the system to maintain reliable detection capability while significantly reducing physical resource consumption compared to continuous monitoring, as resources are only used at necessary periodic intervals rather than continuously
Solution Approach 2:
The UE self-responds to CSI requests with channel state information that the system then monitors for responsiveness. This self-service approach allows the system to detect UE status using information the UE voluntarily provides for channel quality assessment, rather than requiring the system to actively probe or continuously monitor the UE, thus improving physical resource efficiency while maintaining detection reliability
3Loss of time
If the system uses data traffic presence to determine UE responsiveness, then false positives are minimized, but detection speed is reduced
Solution Approach 1:
The system extracts the responsiveness detection function from dependency on data traffic patterns. By using CSI report monitoring as a separate, independent mechanism, the system can detect UE responsiveness directly without waiting for data traffic conditions, thereby increasing detection speed while maintaining reliability through the structured CSI reporting framework that provides clear presence/absence indicators of UE responsiveness
Data Source
AI summary
A system can communicate broadband cellular communications with a user equipment. The system can initiate receiving periodic channel state information reports from the user equipment, wherein the channel state information reports correspond to the broadband cellular communications. The system can, in response to determining that a defined number of consecutive channel state information reports of the periodic channel state information reports have not been received, initiate a user equipment release transaction with regard to the user equipment, and send a user equipment context release request to a centralized unit of a base station of the system.