Handover Type Signaling for Predictable Terminal Delay Handling
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Solution Overview
Problem
User terminals face varying delay times during handover processes between wireless base stations, and existing technologies do not adequately allow terminals to predict or adjust operations based on these delays, particularly in specifying the type of handover.
Innovation Solution
The system enables user terminals to predict handover delays by specifying the type of handover interface, allowing them to perform processes accordingly, and includes a communication system with wireless base stations and a core network that notifies the terminal of the handover type and estimated delay time, facilitating early-stage preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the user terminal performs traditional handover without knowing the handover type, then the handover process is simple, but the terminal cannot predict delay time and cannot perform timely operations
Solution Approach 1:
The base station performs preliminary action by notifying the user terminal of the handover type (X2 handover or S1 handover) before the actual handover occurs. This allows the terminal to predict the delay time in advance and perform necessary operations proactively, resolving the contradiction between maintaining simple procedures and enabling delay prediction.
2Loss of information
If the base station notifies the user terminal of handover type information, then the terminal can predict delay time, but the signaling overhead increases
Solution Approach 1:
The handover type notification is merged with existing handover-related signaling messages between the base station and user terminal. By combining the handover type information with necessary handover command messages, the patent reduces additional signaling overhead while still providing the terminal with delay prediction capability.
3Productivity
If the user terminal knows the handover type in advance, then the terminal can optimize operations based on delay time, but the handover procedure becomes more complex
Solution Approach 1:
The patent applies local quality by providing handover type information specifically at the moments when it is needed for optimization, rather than continuously. The terminal uses this information locally to adjust operations such as buffer management and resource allocation, maintaining procedural simplicity while improving efficiency.
Data Source
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AI summary
A communication device includes a specifying unit for specifying a type of handover to be executed by a user terminal, and a notifying unit for notifying the user terminal of information related to the specified type of handover.