Base Station Preamble Assignment for 5G Handover Latency
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Solution Overview
Problem
In 5G wireless communication systems, the efficiency of preamble use is poor during conditional handover (CHO), leading to prolonged handover times due to contention-based random access, where base stations struggle to immediately identify terminals as transmission sources of preambles, resulting in inefficient preamble assignment and increased handover duration.
Innovation Solution
A base station and terminal system where the terminal selects a preamble from shared preambles and notifies the base station, allowing the base station to pre-notify the handover destination with the terminal's identification information and preamble details, enabling immediate identification and reducing handover time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual preamble assignment is used during conditional handover, then terminal identification is accurate, but preamble assignment efficiency deteriorates and handover time increases
Solution Approach 1:
The base station performs preliminary actions by storing terminal identification information and assigned preambles in advance before handover occurs. When handover is needed, the base station can immediately retrieve the stored preamble information without performing new assignment, thus improving efficiency while maintaining identification accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station acts as a mediator between terminal identification and preamble assignment. The base station maintains a storage structure that links terminal IDs with their assigned preambles, enabling efficient retrieval during handover without direct one-to-one assignment conflicts.
2Productivity
If contention-based random access is used during conditional handover, then preamble use efficiency improves, but handover time increases due to base station struggle to identify terminals
Solution Approach 1:
The base station performs preliminary storage of terminal identification information and preamble assignments before handover occurs. This preliminary action enables the base station to immediately identify terminals and retrieve their assigned preambles during handover, eliminating the time delay associated with contention-based resolution while maintaining efficient preamble usage.
3Reliability
If multiple handover destination candidates are provided, then handover reliability improves, but system complexity increases
Solution Approach 1:
The patent segments the handover management process into distinct components: the base station manages multiple destination candidates and preamble assignments, while the terminal focuses on selecting and executing handover to a single determined destination. This segmentation reduces terminal complexity while maintaining system reliability through base station coordination of multiple candidates.
Data Source
AI summary
A base station includes a receiver and a transmitter. The receiver configured to receive, from a terminal, a handover destination notification including first identification information and second identification information, the first identification information being information for identifying a first base station as a handover destination determined by the terminal, the second identification information being information for identifying a preamble to be transmitted by the terminal to the first base station. The transmitter configured to transmit an advance notification including third identification information and the second identification information to the first base station, the third identification information being information for identifying the terminal.