Handover Decision Method Using Wrong Decision Probability
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Solution Overview
Problem
Existing handover decision algorithms for mobile terminals between networks rely heavily on Received Signal Strength (RSS), which is inadequate for evaluating network conditions such as bandwidth and are unsuitable for heterogeneous networks, leading to incorrect decision probabilities and inefficient handovers.
Innovation Solution
A method that determines the Wrong Decision Probability (WDP) including unnecessary and missing handover probabilities, allowing for a handover decision based on whether the unnecessary handover probability is greater than the missing handover probability, or if either exceeds specific thresholds, to optimize handover decisions across different network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RSS-based handover decision algorithm is used, then handover decision can be made simply, but the decision accuracy is insufficient and cannot evaluate network conditions such as bandwidth
Solution Approach 1:
The patent changes the evaluation parameters from simple RSS to composite parameters including bandwidth, delay, and other link-layer parameters. This allows the handover decision to consider multiple network conditions simultaneously, improving measurement precision while maintaining operational simplicity through standardized parameter comparison.
Solution Approach 2:
The patent creates a composite evaluation metric that combines multiple network parameters (bandwidth, delay, RSS) into a unified handover decision criterion. This composite approach enables comprehensive network condition assessment while preserving the simplicity of a single decision threshold through weighted aggregation of parameters.
2Ease of manufacture
If traditional handover algorithm is used, then implementation is straightforward, but wrong decision probability is high without guarantee
Solution Approach 1:
The patent introduces feedback mechanisms where handover decisions are evaluated based on actual network performance outcomes. The system continuously monitors whether handovers were necessary and adjusts decision thresholds accordingly, improving reliability while maintaining implementation simplicity through iterative optimization.
Solution Approach 2:
The patent performs preliminary evaluation of network conditions and handover necessity before executing the handover. By pre-calculating the probability of wrong decisions and comparing against thresholds, the system ensures reliable decisions are made in advance, reducing actual wrong decision probability while keeping the implementation straightforward.
3Speed
If handover is initiated when RSS is below threshold, then response is quick, but unnecessary handovers occur increasing handover probability
Solution Approach 1:
The patent applies partial action by evaluating multiple parameters rather than relying solely on RSS threshold. This prevents excessive handovers by requiring additional conditions to be met before initiating handover, reducing unnecessary handover probability while maintaining quick response through efficient parameter checking.
Solution Approach 2:
The patent implements dynamic handover thresholds that adapt based on current network conditions and historical performance data. This allows the system to respond quickly when handovers are necessary while dynamically adjusting sensitivity to prevent unnecessary handovers, balancing speed and reliability.
Data Source
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AI summary
The present invention relates to a method for handover of a mobile terminal from a first network to a second network, a network element, a mobile terminal, a base station and a communications system as well as a computer program product and a storage medium. The method comprises the steps of: determining a WDP including an unnecessary handover probability and a missing handover probability according to conditions of the first network and the second network; detecting at least of the following: whether the unnecessary handover probability is greater than the missing handover probability, whether the unnecessary handover probability is greater than a specific threshold and whether the missing handover probability is smaller than a specific threshold; and making a handover decision based on the detection result. The present invention can select a more suitable target network for handover at a more suitable time, thus ensuring the continuity of a mobile user's call.