Network Node Random Access Control for Wireless Connection Supervision
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Solution Overview
Problem
In wireless communication networks, particularly in LTE systems, connectivity disruptions can lead to failed connection supervision due to mismatched security parameters, causing user equipment (UE) to become stuck in a state of broken connectivity, especially during handovers or when security keys are missing or inaccurate.
Innovation Solution
A mechanism where the network node initiates a random access procedure and deliberately refrains from responding to access request messages from the user equipment, forcing it to declare a connection failure, allowing for controlled disconnection and re-establishment of the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node cannot instruct the UE to release the connection or initiate connection re-establishment due to missing or inaccurate security parameters, then the UE becomes stuck in a state of broken connectivity, but the network cannot properly manage or control the connection state
Solution Approach 1:
The network node performs a preliminary random access procedure with the UE before the actual data transmission. This preliminary procedure serves as a test to verify whether the UE can properly respond to network commands. By initiating this test connection attempt in advance, the network can detect connectivity issues before they affect actual communication, allowing the network to identify UEs with broken connectivity while maintaining the ability to control them through the random access mechanism.
Solution Approach 2:
The UE autonomously monitors its own connection state by attempting random access procedures and detecting whether it receives proper responses from the network. The UE self-diagnoses connectivity issues by observing the absence of expected network responses during the random access procedure, and self-manages its connection state by transitioning to idle mode when connection failure is detected, without requiring explicit network instructions that would be impossible to send due to security parameter mismatches.
2Adaptability or versatility
If the network node deliberately refrains from responding to access request messages to force UE to declare connection failure, then the UE can be disconnected and re-establish connection, but this requires the network to actively manage the disconnection process
Solution Approach 1:
Instead of the network explicitly instructing the UE to disconnect or re-establish connection (the normal approach), the network inverts the approach by deliberately not responding to the UE's random access requests. This silent treatment forces the UE to autonomously detect the connection failure and initiate its own re-establishment procedures. The network controls the disconnection indirectly through omission of responses rather than through explicit commands, simplifying the mechanism when security parameters are unavailable.
Solution Approach 2:
The random access procedure serves as a feedback mechanism where the UE sends access requests and expects responses from the network. The presence or absence of network responses provides feedback to the UE about its connection state. When the network refrains from responding, this lack of feedback is the signal that triggers the UE to declare connection failure and initiate re-establishment, creating a simple yet effective control loop without requiring complex signaling.
3Reliability
If security parameters are mismatched between UE and network, then encryption and integrity protection cannot function properly, but the network cannot send unciphered instructions to the UE for security reasons
Solution Approach 1:
The random access procedure acts as an intermediary mechanism that allows the network to indirectly control the UE's connection state without needing to exchange encrypted control messages. By using the publicly visible random access channel and the absence/presence of network responses as the control signal, the system bypasses the need for encrypted instruction transmission while still achieving reliable connection management. The intermediary random access procedure translates the control problem into a domain where encryption is not required.
Solution Approach 2:
The system changes the parameter used for connection control from encrypted control messages to the presence or absence of random access responses. This parameter change allows the network to convey connection control information (disconnect/re-establish instructions) without requiring the UE and network to share synchronized security parameters. The control information is embedded in the physical layer presence/absence of signals rather than in the data layer encrypted messages.
Data Source
AI summary
A user equipment connection supervision method in a user equipment, of a network node initiated random access procedure to force a declaration of connection failure is provided. The user equipment is connected to a wireless communication network via a wireless connection to the network node. After receiving (401) one or more commands from the network node, to perform random access procedure, the user equipment performs one or more attempts to initiate random access procedure by sending (402) one or more access request messages to the network node as a response to the received command. When no response to the sent access request message is received from the network node within a predetermined threshold value, the user equipment declares (406) failure of the wireless connection.