Pre-configured Redirection for LTE Cell Selection
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Solution Overview
Problem
Current cell selection procedures in LTE networks are inefficient, leading to prolonged cell selection times during radio link failures or handover failures, which can result in service interruptions and failed RRC re-establishment, especially when the selected cell lacks the necessary UE context.
Innovation Solution
The network provides pre-configured redirection information to the UE, including lists of physical cell identities, enhanced cell global identities, band information, or carrier frequencies, to facilitate quicker re-establishment of the network connection by prioritizing cells with available UE context, thereby reducing the time taken for cell selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs cell selection according to standard procedures by scanning all available frequencies and cells, then the UE can find a suitable cell for reconnection, but the cell selection time is prolonged causing service interruptions
Solution Approach 1:
The network performs preliminary actions by pre-configuring the UE with redirection information including lists of physical cell identities, enhanced cell global identities, band information, and carrier frequencies before connection failure occurs. This pre-provisioning enables the UE to skip extensive cell scanning during reconnection and directly target suitable cells, dramatically reducing cell selection time while ensuring reliable reconnection.
2Loss of time
If the UE selects any available cell for reconnection, then the cell selection process is faster, but the selected cell may lack the necessary UE context leading to failed RRC re-establishment
Solution Approach 1:
The network provides feedback to the UE in the form of pre-configured redirection information that includes identifiers of cells known to have the UE's context available. This feedback mechanism guides the UE to select cells that have been pre-validated by the network to possess the necessary context, ensuring successful RRC re-establishment without requiring extended verification procedures.
3Productivity
If the network does not provide pre-configured redirection information, then the network signaling overhead is reduced, but the UE cannot efficiently prioritize cells with available context during cell selection
Solution Approach 1:
The network performs preliminary action by pre-configuring the UE with redirection information before connection failure occurs. This includes providing lists of physical cell identities, enhanced cell global identities, band information, and carrier frequencies that the UE should prioritize during cell selection. This pre-provisioning enables efficient cell prioritization without requiring complex real-time signaling during the reconnection process.
Data Source
AI summary
A method includes receiving information to be used in response to failure, while a UE is in a connected state with a network, of a network connection between the user equipment and a current cell. The received information is to be used by the UE to search for another cell to reestablish the network connection. In response to the failure, searching, based on the received information, for another cell to reestablish the network connection. Another method includes determining, in a network, information to be used by a UE in response to failure of a network connection between the UE and a current cell. The information is to be used by the UE in response to the failure occurring while the UE is in a connected state with the network and to be used to search for another cell to reestablish the network connection. Apparatus and program products are disclosed.