Autonomous Handover in Wireless Relay Terminals
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Solution Overview
Problem
In cellular communication systems using relay transmission paths, handover processing is inefficient, often resulting in reduced communication speed or service interruption when switching between relay apparatuses, as existing methods do not effectively manage mobility and path selection.
Innovation Solution
A terminal apparatus and base station apparatus system that autonomously performs handover by acquiring and determining candidate communication paths, allowing the terminal apparatus to switch to an optimal path without network instruction, based on information provided by the serving base station, including factors like load, delay, throughput, and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal apparatus uses traditional handover methods in relay transmission systems, then the base station can control the handover process, but communication speed reduces or service interruption occurs when switching between relay apparatuses
Solution Approach 1:
The terminal apparatus autonomously determines handover timing and selects target relay apparatuses based on measurement results, without waiting for base station instructions. The terminal independently executes handover by notifying the target relay apparatus and switching communication paths, enabling self-service handover that maintains communication speed while ensuring reliability through autonomous decision-making
Solution Approach 2:
The terminal apparatus performs measurement and evaluation of candidate relay apparatuses in advance, maintains handover candidate information, and prepares for potential handover before actual service interruption occurs. This preliminary action allows the terminal to quickly execute handover when needed, maintaining both communication continuity and speed
2Speed
If the terminal apparatus autonomously performs handover without network instruction, then handover speed improves, but handover control complexity increases
Solution Approach 1:
The handover control function is segmented between the terminal apparatus and the base station. The terminal apparatus handles measurement, evaluation, and execution of handover (acquiring measurement results, determining handover timing, selecting target relay apparatuses), while the base station provides candidate information and receives notifications. This segmentation enables fast autonomous handover while distributing control complexity appropriately
Solution Approach 2:
The terminal apparatus changes its operational parameters by switching from traditional network-controlled handover to autonomous handover mode. It adjusts its behavior to independently evaluate candidates, determine handover timing, and execute switching, thereby improving handover speed while managing complexity through parameter-based control strategies
3Reliability
If the terminal apparatus switches relay apparatuses frequently to maintain optimal communication, then communication quality improves, but mobility management complexity increases
Solution Approach 1:
The terminal apparatus dynamically adjusts its handover behavior by continuously measuring communication quality, evaluating candidate relay apparatuses, and making handover decisions based on current conditions. This dynamic approach allows frequent switching when quality degrades while managing complexity through adaptive decision-making rather than rigid rules
Solution Approach 2:
The terminal apparatus implements feedback mechanisms by measuring communication quality metrics, comparing them against thresholds, and using this feedback to trigger handover decisions. The system also receives feedback from the network about handover execution status. This feedback-based control maintains communication quality while managing mobility complexity through closed-loop control
Data Source
AI summary
A terminal apparatus that performs communication using a communication path set between the terminal apparatus and a core network via a base station apparatus connected to the core network or via the base station apparatus and a relay apparatus that relays communication with the base station apparatus acquires information regarding candidates of a communication path to which switching should be performed from a first communication used, from the base station apparatus that functions as a serving base station in the first communication path, determines whether or not to perform switching of the communication path from the first communication path, and performs switching from the first communication path to a second communication path included in the candidates without being instructed by the serving base station, in response to the determination to perform the switching after receiving the information regarding the candidates.