Handover Failure Detection via Terminal Feedback
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Solution Overview
Problem
In radio communication systems, detecting handover failures becomes challenging when the inter-base-station interface cannot be utilized, preventing base stations from exchanging necessary information for detecting handover failure types such as Too Late Handover, Too Early Handover, and Handover to Wrong Cell, which hinders the adjustment of HO parameters and increases handover failure rates.
Innovation Solution
A handover failure detection device and method that observe the presence or absence of acknowledgment responses to handover commands and connection re-establishment requests from mobile terminals to detect handover failures and adjust HO parameters, even when the inter-base-station interface is not available, allowing for the detection and reduction of handover failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If base stations exchange information through inter-base-station interface to detect handover failure types, then detection accuracy is improved, but system complexity and dependency on interface availability increase
Solution Approach 1:
The patent extracts the essential detection functionality from the complex inter-base-station interface system by having the mobile terminal directly report handover failure information to the source base station. This eliminates the need for complex information exchange between base stations while maintaining detection accuracy, as the mobile terminal acts as a mobile observer that directly provides the necessary failure type information.
2Measurement precision
If base stations rely on inter-base-station interface for handover failure detection, then detection capability is improved, but reliability decreases when interface is unavailable
Solution Approach 1:
The mobile terminal performs self-service by autonomously detecting handover failure types and directly reporting this information to the source base station. This eliminates the system's dependency on the inter-base-station interface, ensuring that handover failure detection remains reliable even when the interface is unavailable, as the mobile terminal independently generates and transmits the necessary detection information.
3Manufacturing precision
If detailed handover failure information is collected through inter-base-station interface, then parameter adjustment precision is improved, but information loss increases when interface fails
Solution Approach 1:
The mobile terminal provides direct feedback to the source base station about handover failure types by reporting specific information elements (such as failure type indicators, cell identities, and timing information). This direct feedback mechanism ensures that the source base station receives complete handover failure information without loss, enabling precise HO parameter adjustment even when the inter-base-station interface is unavailable.
Data Source
AI summary
A handover failure detection device (121) detects at least one of handover failure types regarding outgoing handover from a first cell (131) managed by a first base station (111) by observing: (a) presence/absence of reception by the first base station (111) of an acknowledgment response to a handover command regarding first handover of a mobile terminal (101) from the first cell (131) to a second cell (132) managed by a second base station (112); and (b) presence/absence of a request for connection re-establishment from the mobile terminal (101) to the first cell (131), the request occurring after initiation of the first handover. As a result, it contributes to improvement of handover failure detection or reduction of handover failure in a situation where exchange of information between base stations is restricted.