Wireless Device Call Setup Failure Recovery via Default Cell Reporting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication networks, users often experience call setup failures due to issues at the radio base station, such as uplink interference or software/hardware problems, leading to 'cell trapping' where the device remains in a problematic cell despite good radio conditions, and existing solutions result in delayed cell recovery, causing the device to stay in a more distant cell instead of returning to the closest one.
Innovation Solution
A method is introduced where a wireless device registers consecutive call setup failures, initiates a cell reselection procedure to a default cell, and provides a call setup failure report to the default cell, which is then forwarded to the OSS within a latency constraint, allowing for immediate call setup recovery and reconnection to the closest cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows standard cell selection/reselection using RSRP and RSRQ measurements, then the UE maintains connection in the current cell with good radio conditions, but the UE becomes trapped in a problematic cell and cannot perform cell reselection to neighboring cells
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports call setup failure information to the network. The network uses this feedback to identify problematic cells and trigger recovery procedures, enabling the system to adapt to call setup failures that occur despite good radio conditions.
Solution Approach 2:
The patent introduces a preliminary cell reselection mechanism that activates when call setup failures are detected. Instead of waiting for radio conditions to deteriorate, the system proactively triggers cell reselection based on call setup failure reports, preventing the UE from being permanently trapped in a problematic cell.
2Reliability
If existing solutions trigger cell reselection to address call setup failures, then the UE can escape the problematic cell, but the UE may be influenced to stay in a more distant cell instead of returning to the closest cell
Solution Approach 1:
The patent implements dynamic cell reselection where the target cell selection is not fixed but adapts based on network conditions and recovery status. The system can dynamically adjust whether to reselect to a neighboring cell or return to the original cell after recovery, optimizing the recovery path based on real-time conditions.
Solution Approach 2:
The network receives feedback about call setup failures and uses this information to make intelligent decisions about cell reselection. The feedback loop enables the network to determine the optimal recovery strategy, whether that means reselecting to a different cell or returning to the original cell after interference resolution.
3Loss of time
If the network monitors and responds to call setup failures in real-time, then call setup recovery can be immediate, but the system complexity and processing requirements increase
Solution Approach 1:
The UE performs self-monitoring of call setup failures and autonomously generates failure reports. This self-service approach distributes the monitoring burden from the network to the UE, reducing network complexity while enabling real-time detection and reporting of call setup failures.
Solution Approach 2:
The system implements partial monitoring by focusing specifically on call setup failure events rather than continuous comprehensive network monitoring. This selective approach reduces processing requirements while still capturing the critical information needed for rapid recovery.
Data Source
AI summary
The present disclosure relates to arrangements and methods performed in a wireless network comprising an operation support system (OSS) and a plurality of radio base stations, (RBSs), each RBS providing one or more cells. When performed in a wireless device, the method comprises registering of a set number of consecutive call setup failures to an RBS providing a first cell. The method further comprises initiating a cell reselection procedure to a RBS providing a default cell, and providing, at call setup in the default cell, a call setup failure report to the RBS providing the default cell, wherein the call set up failure report comprises information on the call setup failures to the RBS providing the first cell. Additionally the method comprises causing forwarding of the call setup failure report from the RBS providing the default cell to the OSS, wherein the forwarding of the call setup failure report is caused in compliance with a latency constraint for call setup recovery.