Network Node Rejection Indication for Wireless Connection Redirection
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Solution Overview
Problem
In LTE networks, wireless communications devices experience delays and unnecessary signaling due to repeated attempts to connect to unavailable core network nodes without receiving a clear rejection cause, leading to inefficient access and network performance.
Innovation Solution
A method where network nodes provide a rejection indication to initiate a Tracking Area Update (TAU) when a core network node is unavailable, allowing devices to access the network without specifying a particular node, thereby redirecting to available nodes during the next attempt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communications devices repeatedly attempt to connect to unavailable core network nodes without receiving clear rejection causes, then connection establishment may eventually succeed, but access delays and unnecessary signaling increase
Solution Approach 1:
The network node provides feedback to the wireless communications device by including a rejection cause value in the rejection message. This feedback mechanism informs the device why the connection attempt failed and guides it to select a different core network node, preventing repeated futile attempts and reducing access delays.
Solution Approach 2:
The system performs preliminary action by proactively providing the rejection cause before the device can attempt another connection. This allows the device to immediately adjust its behavior and select a different core network node, rather than blindly retrying the same failed connection attempt.
2Reliability
If wireless communications devices repeatedly attempt to connect to unavailable core network nodes, then connection establishment may eventually succeed, but unnecessary signaling increases
Solution Approach 1:
The rejection cause value serves as feedback that prevents the wireless communications device from generating unnecessary signaling by repeatedly attempting to connect to the same unavailable core network node. The device uses this information to redirect its connection attempts to alternative nodes.
Solution Approach 2:
The rejection message, which initially appears as a negative outcome, is converted into a beneficial element by including the rejection cause value. This transforms the failure signal into a constructive guide that helps the device make better connection decisions and avoid wasteful signaling.
3Productivity
If network nodes provide detailed rejection causes to devices, then access efficiency improves, but message complexity increases
Solution Approach 1:
The rejection cause is represented as a standardized parameter (cause value) that can be easily processed by both network nodes and devices. This parameterized approach maintains message simplicity while conveying essential information needed for efficient access control and redirection.
Data Source
AI summary
A method performed by a radio network node for enabling establishment of a connection between a wireless communications device and a core network, which network node and wireless communications device operate in a wireless communications network including the core network. The network node obtains a request from the wireless communications device to establish a connection to a first core network node included in the core network. The first core network node is not available for connection to the wireless communications device. The network node provides the wireless communications device with a rejection of the request to establish the connection to the first core network node, which rejection includes an indication to initiate a Tracking Area Update, TAU.