Inter-RAT Cell Change Handling with Access Barring Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, inter-RAT cell change procedures often fail due to unclear specifications and access barring, leading to significant delays and service quality issues when transferring connections between different radio access technologies like GSM, UMTS, and LTE, as timers and access barring times are not accurately considered, resulting in prolonged data transmission delays and potential loss of better data rates.
Innovation Solution
A method for handling inter-RAT cell changes that involves receiving a cell change order message, performing a radio resource control connection establishment procedure, receiving access barring information, and determining the cell change order procedure as failed when access is barred, allowing the mobile device to return to the original cell and send a failure message with access barring information, thereby avoiding unnecessary re-attempts and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE attempts to establish RRC connection with the target LTE cell immediately after cell change order, then the cell change procedure completes faster, but the UE encounters access barring delays causing huge transmission delays
Solution Approach 1:
The UE performs preliminary actions by checking access barring information and determining access barring status before attempting RRC connection establishment. This preliminary check prevents futile connection attempts and allows the UE to plan its next actions accordingly, avoiding the huge delays caused by access barring.
Solution Approach 2:
The system implements feedback by having the UE determine access barring based on received access barring information and use this determination to guide subsequent connection attempts. The feedback loop allows the UE to adjust its behavior based on the access barring status, optimizing the balance between connection speed and avoiding delays.
2Reliability
If the UE repeatedly attempts RRC connection establishment despite access barring, then the UE may eventually succeed, but the UE experiences ping-pong situations and prolonged delays
Solution Approach 1:
The UE applies preliminary anti-action by determining access barring before attempting RRC connection establishment. When access barring is detected, the UE proactively avoids making connection attempts that would be rejected, thereby preventing the ping-pong effect and reducing unnecessary delays while maintaining connection reliability.
3Productivity
If the UE ignores access barring information and continues cell change procedure, then the procedure completes faster, but the UE loses better data rates and experiences service quality issues
Solution Approach 1:
The UE performs preliminary checking of access barring information before proceeding with the cell change procedure. This preliminary action ensures that the UE only proceeds with cell change when access is permitted, maintaining both procedure efficiency and service continuity by avoiding futile attempts that would compromise service quality.
Data Source
AI summary
A method of handling cell change for a mobile device is disclosed. The method comprises receiving a cell change order message from a source cell of a first radio access technology (RAT), in response to the receiving, performing a cell change order procedure from the source cell of the a first RAT to a target cell of a second RAT, performing a RRC, an abbreviation of radio resource control, connection establishment procedure to the target cell of the second RAT, receiving system information including access barring information of the target cell of the second radio access technology from the target cell of the second radio access technology, determining access barring according to the access barring information, and determining that the cell change order procedure is failed when the RRC connection establishment procedure is failed due to the access barring.