User Equipment Multiband Capability Reporting and Handover Validation
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in efficiently reporting multiband capability to the network, particularly when the carrier frequency of a target cell cannot be calculated using the operating band information, leading to potential handover failures and connection issues.
Innovation Solution
The UE method involves receiving a handover command with operating band information, configuring the target cell as barred if the carrier frequency cannot be calculated, and performing a connection reestablishment procedure to select a cell with a calculable carrier frequency, including transmitting information on its capability to support bands and overlapping bands to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reports detailed multiband capability information including overlapping bands to the network, then the network can make more informed handover decisions, but the signaling overhead and complexity of capability reporting increase
Solution Approach 1:
The capability reporting is segmented into two parts: supported bands (primary capability) and overlapping bands (secondary capability). This segmentation allows the network to receive comprehensive multiband information in an organized manner, improving handover decision accuracy while maintaining structured reporting that reduces processing complexity
Solution Approach 2:
The patent adds a new dimension to capability reporting by introducing the concept of overlapping bands as a separate category from supported bands. This dimensional expansion allows the network to distinguish between bands the UE can operate in versus bands that overlap with supported bands, enabling more precise handover decisions without overwhelming the reporting structure
2Adaptability or versatility
If the UE attempts handover to a target cell with non-calculable carrier frequency, then the network can explore more target cell options, but the handover may fail and cause connection issues
Solution Approach 1:
The UE performs preliminary validation of the target cell's carrier frequency calculability before completing the handover. By checking whether the carrier frequency can be calculated from the operating band information in advance, the UE prevents attempting handovers to incompatible cells, thereby maintaining handover success rate while still allowing flexible selection among valid target cells
Solution Approach 2:
The UE provides feedback to the network about the calculability of carrier frequencies for target cells. This feedback mechanism allows the network to adjust handover decisions based on UE capability information, ensuring that handovers are directed only to cells with calculable carrier frequencies, thus improving reliability while maintaining adaptability in cell selection
3Reliability
If the UE configures the target cell as barred when carrier frequency cannot be calculated, then connection stability is improved, but the UE loses access to potentially suitable cells
Solution Approach 1:
The patent changes the state parameter of the target cell from 'accessible' to 'barred' based on the carrier frequency calculability condition. This parameter change ensures that only cells with calculable carrier frequencies remain accessible, improving connection stability by preventing handovers to incompatible cells while the network can still manage cell accessibility dynamically
Data Source
AI summary
A method for processing a signal at a user equipment in a wireless communication system is disclosed. The method includes steps of receiving, from a source cell, a handover command including information on an operating band of a target cell; and if the carrier frequency of the target cell is not calculated using the information on the operating band of the target cell, configuring the target cell as a barred cell.