Conditional Handover Data Discard Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication networks, especially those using high carrier frequencies like millimeter wave, conditional handovers often result in candidate cells storing data for extended periods, leading to resource reservation issues, as other cells are unsure when to discard data if they are not selected as the target cell for handover.
Innovation Solution
The solution involves transmitting information to candidate cells indicating when to discard data, either through a message or a timer that starts upon receiving the handover information and stops if the cell is selected as the target cell, ensuring that data is cleared from non-selected cells to free up resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If candidate cells store data in buffer during conditional handover, then data can be forwarded to the target cell, but resources remain reserved unnecessarily in non-selected cells
Solution Approach 1:
The source gNB performs preliminary actions by forwarding data to candidate cells before handover execution and provides discard timing information in advance. This allows candidate cells to prepare for potential handover while knowing when to discard data if not selected, preventing unnecessary resource reservation.
Solution Approach 2:
The system implements feedback mechanisms where the source gNB receives handover execution status from candidate cells and sends discard indications back to non-selected cells. This feedback loop ensures that data is discarded from candidate cells that were not selected as target, optimizing resource allocation.
2Reliability
If data is kept in buffer for extended periods in candidate cells, then handover can be executed successfully, but network resources are wasted
Solution Approach 1:
Discard timing information is provided in advance to candidate cells along with data forwarding. This preliminary information allows cells to know exactly when to discard data, preventing extended buffer storage and unnecessary resource reservation while ensuring handover execution can proceed smoothly.
Solution Approach 2:
The system implements structured discarding of data from candidate cells based on handover execution status. Non-selected cells discard their buffered data according to discard indications, freeing up resources that were reserved for potential handover, thus recovering network resources efficiently.
3Productivity
If discard timing information is provided to candidate cells, then resources are freed efficiently, but additional signaling is required
Solution Approach 1:
Discard timing information is merged with existing data forwarding procedures and handover signaling. The discard indication is combined with the handover execution status feedback, consolidating multiple functions into existing signaling flows and minimizing additional overhead.
Solution Approach 2:
Existing signaling messages are made multi-functional by incorporating discard timing information and discard indications into standard handover and data forwarding procedures. This universal approach allows a single signaling mechanism to serve multiple purposes: data forwarding, handover coordination, and resource management.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for discarding data corresponding to a conditional handover. One apparatus includes a transmitter that transmits information corresponding to a conditional handover to multiple candidate cells. The information indicates to one or more candidate cells of the multiple candidate cells a time to discard data or to discard the data.