UE Cell Reselection Timer for UMTS Connection Reject Handling
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Solution Overview
Problem
In UMTS cellular radio systems, the existing method of disabling cell reselection after a connection reject message is not sufficient to prevent premature attempts to reconnect to a UTRAN, leading to wasted system resources due to reconnection attempts during network congestion or before the wait time has expired.
Innovation Solution
A method and apparatus that allow cell reselection only after a predetermined wait time has elapsed or upon confirmation that the UTRAN can accept a connection, preventing premature reconnection attempts and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is disabled after receiving a connection reject message, then the UE prevents premature reconnection attempts to UTRAN, but the UE cannot reconnect even when the network is ready to accept connections
Solution Approach 1:
The patent makes the cell reselection disablement dynamic by introducing a timer mechanism. The cell reselection is disabled only for a limited duration (wait time) after receiving a connection reject message, after which it is automatically re-enabled. This dynamic approach allows the system to balance between preventing premature reconnection attempts and enabling reconnection when the network is ready, resolving the contradiction between connection reliability and reconnection delay.
Solution Approach 2:
The patent changes the parameter of cell reselection behavior from a static disabled state to a time-limited disabled state. By introducing a wait time parameter that controls the duration of cell reselection disablement, the system can adjust the reconnection behavior based on network conditions. This parameter change allows the UE to respect network congestion indicators while still being able to reconnect when the network capacity becomes available.
2Speed
If the UE attempts to camp on UTRAN immediately after receiving a connection reject message, then the UE can quickly reestablish connection, but it wastes system resources by attempting reconnection during network congestion
Solution Approach 1:
The patent applies preliminary anti-action by having the UE proactively disable cell reselection for a specified wait time period after receiving a connection reject message. This preliminary action prevents the UE from attempting to camp on UTRAN during the period when the network is congested and unable to accept connections, thereby avoiding waste of system resources. The wait time is determined based on network indicators, ensuring that reconnection attempts are timed appropriately.
3Reliability
If cell reselection is completely disabled to prevent premature reconnection attempts, then network congestion is avoided, but the UE cannot adapt to changing network conditions and miss reconnection opportunities
Solution Approach 1:
The patent introduces dynamics into the cell reselection control mechanism by implementing a time-limited disablement approach. Instead of permanently disabling cell reselection, the system disables it only for a predetermined wait time period after receiving a connection reject message. This dynamic control allows the UE to adapt to changing network conditions - respecting network congestion indicators during the wait time while being able to respond to network availability after the wait time expires, thus maintaining both congestion management and adaptability.
Data Source
AI summary
There is provided a method, in a wireless communications device, the method comprising: receiving from a first RAT a reject message, the reject message indicating a period of time; camping on a cell of a second RAT; disallowing camping on a cell of the first RAT unless at least one of the following criteria are met: the period of time has elapsed; and the wireless communications device receives a further message indicating that the first RAT has confirmed it will accept a connection from the wireless communications device.