RedCap UE Emergency Connection via Segmented Messaging
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Solution Overview
Problem
In emergency situations, base stations uniformly reject connections with RedCap UEs, preventing special-purpose RedCap UEs from connecting and using their communication functions for critical purposes like safety confirmation and life support.
Innovation Solution
A communication terminal and base station system where the communication terminal transmits an initial message without specific terminal information, receives a response, and then includes the specific terminal information in a subsequent message, allowing the base station to enable the communication function of the specific communication terminal even in an emergency state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uniformly rejects connection with RedCap UEs in emergency situations, then the network load is reduced and communication priority is given to critical users, but special-purpose RedCap UEs cannot connect and use their communication functions for critical purposes
Solution Approach 1:
The patent segments RedCap UEs into two categories: general RedCap UEs and special-purpose RedCap UEs. The terminal controller identifies special-purpose UEs by detecting emergency situation information and transmits this information in the third message. The base station then differentiates between these segments and applies different connection policies, allowing special-purpose UEs to connect even during emergency situations while maintaining network load management for other users.
Solution Approach 2:
The patent implements dynamic connection control where the base station's response varies based on the terminal type and emergency situation status. In normal situations, the base station may reject RedCap UE connections to manage load. In emergency situations, the base station dynamically changes its behavior to accept connections from special-purpose RedCap UEs while maintaining rejection for general RedCap UEs, thus adapting the network policy to current conditions.
2Productivity
If the communication terminal includes specific terminal information in the first message, then the base station can immediately identify and restrict the terminal in emergency situations, but the terminal cannot establish initial connection and use communication functions
Solution Approach 1:
The patent applies preliminary action by having the terminal establish initial connection without including specific terminal information in the first message. The terminal performs preliminary connection establishment, then in subsequent messages (third message or later) includes the emergency situation information and identifies itself as a special-purpose RedCap UE. This preliminary connection phase ensures the terminal can establish communication before full identification is complete.
Solution Approach 2:
The patent provides beforehand cushioning by allowing the terminal to establish initial connection and communicate basic information before the base station makes final connection decisions. The terminal includes emergency situation information in subsequent messages, cushioning against the possibility that the base station might reject the connection based solely on the first message. This ensures communication functions remain available even if initial identification is incomplete.
Data Source
AI summary
A communication terminal includes a terminal communicator configured to perform radio communication with a base station, and a terminal controller configured to control the terminal communicator. The terminal controller causes the terminal communicator to transmit a first message of the radio communication to the base station without including, in the first message, specific terminal information indicating that the communication terminal is a specific communication terminal use of which is possibly restricted by the base station, receives a second message as a response to the first message from the base station via the terminal communicator, includes the specific terminal information in a subsequent message that is a third message or is a message subsequent to the third message as a response to the second message, and causes the terminal communicator to transmit the subsequent message to the base station.