Cell Update Reconfiguration Status Indicator
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Solution Overview
Problem
Radio link failures during the configuration of radio bearers in user equipment (UE) can lead to synchronization issues between the UE and the network, resulting in call drops due to incorrect assumptions about the configuration status.
Innovation Solution
Implementing a cell update process with a reconfiguration status indicator that allows the UE and network to confirm whether the reconfiguration is complete, even in the presence of radio link failures, by sending a cell update message with dual status indicators or a cell update confirm message to revert to the previous configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network assumes UE failed to configure radio bearers when Radio Bearer Setup Complete is not received, then the network can simplify error handling, but the UE and network may get out of sync leading to call drops
Solution Approach 1:
The patent introduces a feedback mechanism where the UE sends a Cell Update message with a reconfiguration status indicator to inform the network whether the radio bearer configuration was successfully applied. This allows the network to accurately determine the UE's configuration state without assuming failure, thereby maintaining synchronization while improving error handling.
Solution Approach 2:
The patent uses a Cell Update message with reconfiguration status indicator as an intermediary communication mechanism between the UE and network. This intermediary carries explicit information about the configuration status, resolving the ambiguity in error handling and preventing synchronization issues.
2Reliability
If the network waits for RLC layer ACK to confirm reconfiguration, then the network can ensure reliable delivery, but the call may drop if radio link failure occurs before ACK reception
Solution Approach 1:
The patent implements preliminary action by having the UE send a Cell Update message with reconfiguration status indicator immediately after configuring radio bearers, before waiting for RLC layer ACK. This allows the network to know the UE's configuration state in advance and take appropriate actions even if the radio link fails before ACK delivery.
Solution Approach 2:
The patent establishes a feedback loop where the UE proactively informs the network of its reconfiguration status through Cell Update messages. This feedback mechanism ensures the network always has accurate information about the UE's configuration state, eliminating the risk of call drops due to timing issues.
3Reliability
If the UE sends Cell Update message with reconfiguration status indicator, then the UE and network can maintain synchronization, but the message format and processing complexity increase
Solution Approach 1:
The patent merges the reconfiguration status indication into the existing Cell Update message structure rather than creating a separate message type. This integration approach maintains synchronization reliability while minimizing the increase in message format complexity by reusing established message frameworks.
Data Source
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AI summary
If there is a radio link failure condition (330) between a user equipment (380) and a network (390) during or after a reconfiguration process, a cell update process with reconfiguration status indicates whether a user equipment reconfiguration is complete. If the network (390) receives an indication that the user equipment reconfiguration is complete, either through a stand-alone reconfiguration complete message (320) or a status indicator of a cell update message (350) from the user equipment (380), the network (390) proceeds in accordance with the current configuration.