Terminal Handover Fallback for Command Reception Failure

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Solution Overview

Problem

During handover processes in communication technologies, terminals often fail to receive handover commands from source cells due to deteriorating channel conditions, leading to potential handover failures.

Innovation Solution

A handover method where a terminal falls back to a handover process indicated by a handover command or continues with a conditional handover if the handover command received from a source cell does not carry a trigger condition for a conditional handover.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a terminal initiates a handover to a target cell, then the handover process can be completed, but the terminal no longer receives configuration or related indication information from the source cell which may cause handover failure when channel conditions deteriorate

Engineering Contradiction:

Improvehandover success rateVSAvoidhandover command reception

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple handover commands with different target cells and trigger conditions before the handover is actually needed. The terminal receives and stores multiple conditional handover configurations in advance, so that when channel conditions deteriorate, the terminal can immediately execute the appropriate pre-configured handover without needing to receive additional commands from the source cell.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements beforehand cushioning by providing backup handover options and trigger conditions that cushion against potential handover failures. Multiple target cells are pre-configured with different execution conditions, creating a safety buffer that ensures handover continuity even if some handover attempts fail due to deteriorating channel conditions.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If a handover command without trigger condition is received during conditional handover process, then signaling integrity is maintained, but the terminal needs to decide whether to fall back or continue conditional handover

Engineering Contradiction:

Improvesignaling integrityVSAvoidhandover decision logic

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying the handover command structure to include or exclude trigger conditions based on the current handover state. When a handover command is received during conditional handover, the terminal checks whether the command contains a trigger condition parameter. Based on this parameter presence, the terminal automatically adjusts its behavior - either falling back to basic handover or continuing conditional handover - without requiring complex external coordination.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250048208A1Handover method and terminal

Publication Date: 2025.02.06 VIVO MOBILE COMM CO LTD

AI summary

A handover method includes: falling back, by a terminal to a handover process indicated by a handover command, or continuing, by the terminal, to perform a conditional handover in the case that the handover command sent by a source cell is received during a process of the conditional handover. The handover command does not carry a trigger condition for a conditional handover.