WLAN Offload Parameter Handling During LTE Cell Selection
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Solution Overview
Problem
In LTE and LTE-Advanced wireless communication systems, user equipment (UE) faces challenges in handling dedicated WLAN offload parameters during cell selection procedures, leading to potential communication failures if these parameters are not managed correctly.
Innovation Solution
A communication device with a processing unit and storage unit that receives dedicated WLAN offload parameters and timers from a first cell, starts a WLAN offload timer, performs cell selection, stops the timer, and releases the parameters upon selecting a second cell, ensuring proper communication with the new cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE keeps dedicated WLAN offload parameters during cell selection, then the parameters can be reused in the new cell, but communication failures occur due to parameter mismatch with the new cell
Solution Approach 1:
The patent applies preliminary action by clearing the dedicated WLAN offload parameters before the cell selection procedure completes. The UE proactively removes the parameters from the first cell before attempting to connect to the second cell, preventing potential parameter mismatch issues. This advance preparation ensures that the UE starts the cell selection with a clean parameter state, avoiding communication failures while maintaining the ability to receive new parameters from the target cell.
2Reliability
If the UE releases dedicated WLAN offload parameters immediately upon cell selection, then communication reliability with the new cell is improved, but parameter reuse efficiency decreases
Solution Approach 1:
The patent applies preliminary action by clearing the dedicated WLAN offload parameters before the cell selection procedure completes. The UE proactively removes the parameters from the first cell before attempting to connect to the second cell, preventing potential parameter mismatch issues. This advance preparation ensures that the UE starts the cell selection with a clean parameter state, avoiding communication failures while maintaining the ability to receive new parameters from the target cell.
3Loss of time
If the UE performs cell selection without clearing offload parameters, then the process is faster, but communication failures occur due to parameter conflicts
Solution Approach 1:
The patent applies preliminary action by clearing the dedicated WLAN offload parameters before the cell selection procedure completes. The UE proactively removes the parameters from the first cell before attempting to connect to the second cell, preventing potential parameter mismatch issues. This advance preparation ensures that the UE starts the cell selection with a clean parameter state, avoiding communication failures while maintaining the ability to receive new parameters from the target cell.
Data Source
AI summary
A communication device of handling an offload parameter according to a cell selection comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise receiving at least one dedicated wireless local area network (WLAN) offload parameter and a dedicated WLAN offload timer from a first cell in a connected mode; receiving a radio resource control (RRC) connection release message from the first cell; starting the dedicated WLAN offload timer; performing a cell selection procedure in response to the RRC connection release message; selecting a second cell according to the cell selection procedure; stopping the dedicated WLAN offload timer; and releasing the at least one dedicated WLAN offload parameter.