Cell Handover Detection for Voice Fallback Accuracy
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Solution Overview
Problem
Current cell handover methods in wireless communication systems incorrectly determine inter-system handovers as unnecessary, leading to inefficient use of communication resources and reduced communication efficiency, particularly in scenarios where voice services fall back to 2G/3G/4G networks from NR networks.
Innovation Solution
A method and apparatus that utilize a first network device to detect unnecessary handovers by determining handover detection manners based on service type, using signal quality thresholds and measurement results specific to the service type, to prevent incorrect determination of handovers as unnecessary, thereby optimizing mobility parameters and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs inter-system handover through voice fallback procedure, then the voice service can be performed normally, but the handover is incorrectly determined as unnecessary handover
Solution Approach 1:
The patent applies local quality by differentiating detection parameters based on service type. For voice services, the system uses specific detection parameters (voice service indicator, signal quality thresholds) that are different from general handover detection parameters. This allows accurate distinction between necessary voice fallback handovers and unnecessary handovers, resolving the contradiction between maintaining voice service reliability and improving handover detection accuracy.
Solution Approach 2:
The patent changes detection parameters dynamically based on service type. When a voice service is detected, the system modifies the handover detection parameters to exclude voice service duration from unnecessary handover calculations. This parameter adjustment prevents voice fallback handovers from being incorrectly marked as unnecessary, while still enabling accurate detection of truly unnecessary handovers.
2Duration of action of stationary object
If the duration of voice service is counted into unnecessary handover detection time, then the detection period is extended, but the probability of incorrect determination increases
Solution Approach 1:
The patent extracts the voice service duration from the unnecessary handover detection time calculation. By separating voice service timing information from handover detection parameters, the system eliminates the source of incorrect determinations. This extraction allows the detection mechanism to focus solely on genuine handover necessity without being contaminated by voice service duration, thereby improving measurement precision.
Solution Approach 2:
The patent segments the detection time into different components: voice service duration (excluded) and actual handover detection period (included). This segmentation allows the system to maintain appropriate detection time for analyzing handover conditions while preventing voice service duration from inflating the detection period and causing false positives.
3Productivity
If unnecessary handover optimization is performed based on incorrect detection, then communication resources are consumed, but the optimization is invalid
Solution Approach 1:
The patent implements feedback mechanisms where network devices report handover detection results to core network entities. This feedback loop allows for validation and correction of detection accuracy, preventing invalid optimizations based on incorrect handover determinations. The feedback mechanism ensures that only accurate handover analysis results in resource allocation decisions, eliminating wasteful spending on invalid optimizations.
Data Source
AI summary
A cell handover method and an apparatus are disclosed. The cell handover method includes: a first network device receives handover request information from a second network device, where the handover request information is used to request to hand over a terminal device to a target cell to perform a first-type service. The first network device determines an unnecessary handover detection manner related to the first-type service. The first network device detects, based on the unnecessary handover detection manner, whether handover of the terminal device to the target cell is unnecessary handover. Handover of the terminal device to the target cell is inter-system handover triggered by a service type such as a voice service, and is not related to coverage and a mobility parameter of the network device. According to the foregoing solution, the communication resources can be saved, and the communication efficiency can be improved.