Conditional Handover Status Reporting for Base Stations
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Solution Overview
Problem
The existing conditional handover techniques in LTE and NR systems lead to inefficient use of system resources due to unnecessary data forwarding and resource wastage, as well as increased handover interruption times, due to the preparation of multiple candidate target cells for handover, where not all are actually used.
Innovation Solution
The proposed method involves a base station transmitting CHO status report configuration information to a terminal, which then reports on the likelihood of handover to specific candidate cells, allowing the source cell to determine the most suitable target cell and forward data only to that cell, thereby optimizing resource allocation and reducing handover interruption times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If data is forwarded in advance to multiple candidate target cells, then handover interruption time is reduced, but system resource efficiency deteriorates due to unnecessary data forwarding
Solution Approach 1:
The patent extracts the unnecessary data forwarding operation by introducing a selection mechanism. Instead of forwarding data to all candidate target cells, the system identifies and selects only the most suitable target cell based on measurement reports and handover probability, then forwards data only to that selected cell. This removes the wasteful resource consumption while preserving the handover speed benefit.
Solution Approach 2:
The patent changes the parameter of data forwarding from a binary state (forward to all candidates or none) to a selective state based on handover probability thresholds. By introducing probability-based selection criteria and threshold parameters, the system dynamically determines which target cells receive forwarded data, optimizing the balance between handover speed and resource efficiency.
2Reliability
If resources are reserved in multiple candidate target cells, then handover failure probability is reduced, but resource wastage increases
Solution Approach 1:
The patent removes unnecessary resource reservations by introducing a selection mechanism. Instead of reserving resources in all candidate target cells, the system identifies the most suitable target cell based on measurement reports and handover probability, then reserves resources only in that selected cell. This extracts the wasteful resource consumption while maintaining handover reliability.
Solution Approach 2:
The patent applies partial action by reserving resources in only one or a few highly probable target cells rather than all candidate cells. By using probability thresholds to determine the degree of resource reservation, the system performs just enough preparation to ensure reliable handover without excessive resource consumption in low-probability scenarios.
3Reliability
If data is forwarded to candidate target cells before handover execution, then data transmission continuity is improved, but unnecessary data forwarding occurs
Solution Approach 1:
The patent extracts unnecessary data forwarding by introducing a selection mechanism based on handover probability. Instead of forwarding data to all candidate target cells, the system identifies the most suitable target cell and forwards data only to that cell. This removes the wasteful data transmission while preserving data continuity for the actual handover target.
Solution Approach 2:
The patent changes the data forwarding parameter from a blanket approach (forward to all candidates) to a selective approach based on handover probability thresholds. By introducing probability-based selection criteria, the system dynamically determines which target cells receive forwarded data, ensuring data continuity while eliminating unnecessary data transmission.
Data Source
AI summary
Disclosed are a method and an apparatus for enhanced conditional handover (CHO). An operation method of a base station may comprise: receiving a measurement report message from a terminal; transmitting a CHO request message to one or more candidate target cells; receiving a CHO request ACK message from the one or more candidate target cells; and transmitting an RRC reconfiguration message including CHO status report configuration information to the terminal, wherein the CHO status report configuration information requests transmission of information for determining a target cell to which terminal is likely to be handed over among the one or more candidate target cells.