Vertical Handover via Intermediate Network for Seamless Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vertical handover processes in wireless devices often result in delays and packet losses due to the need to suspend application data transmission while configuring a new access network, especially when the source and target networks cannot be active simultaneously, leading to interference and configuration issues.
Innovation Solution
Implementing a method that uses an intermediate access network for seamless handover, allowing the wireless apparatus to transition from the current network to an intermediate network and then to the target network, ensuring that both networks are fully configured before data transmission resumes, thereby minimizing delays and packet losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If direct vertical handover is performed from source access network to target access network, then handover speed is improved, but delay and packet loss increase due to configuration suspension
Solution Approach 1:
The patent introduces a packet loss compensator that acts as an intermediary mechanism between the network layers. This compensator captures packets during handover suspension and retransmits them after handover completion, effectively mediating the conflict between fast handover execution and continuous data transmission.
Solution Approach 2:
The patent implements preliminary actions by pre-capturing and buffering packets at the packet loss compensator before handover occurs. This allows the system to prepare for potential packet loss in advance, rather than reacting after loss occurs, thereby reducing the impact of handover-induced transmission interruptions.
2Loss of time
If source and target access networks are activated simultaneously, then configuration time is reduced, but interference and device complexity increase
Solution Approach 1:
The patent performs preliminary network selection and evaluation before handover execution. The decision unit assesses target networks in advance and selects the optimal target, allowing configuration to begin immediately when handover is initiated, thereby reducing overall configuration time without requiring simultaneous activation of multiple networks.
Solution Approach 2:
The patent implements a feedback mechanism where the decision unit continuously monitors network conditions and handover progress. Based on this feedback, the system dynamically adjusts the handover timing and target selection, optimizing the balance between configuration speed and interference avoidance.
3Stability of the object's composition
If application data transmission is suspended during handover configuration, then network stability is improved, but service continuity deteriorates
Solution Approach 1:
The patent segments the data transmission function into two independent paths: the original transmission path that remains stable during handover, and the compensator path that handles packet retransmission. This segmentation allows network configuration to proceed stably while service continuity is maintained through the parallel compensator mechanism.
Solution Approach 2:
The packet loss compensator temporarily discards packets that would be lost during handover suspension, then recovers them by capturing and retransmitting the buffered packets after handover completion. This discarding and recovering mechanism maintains service continuity without compromising network configuration stability.
Data Source
AI summary
A vertical handover decision to perform a seamless vertical handover of a wireless apparatus from a current access network to a target access network is established. When deciding to perform the vertical handover from the current access network to the target access network it can be considered whether an intermediate access network could be used. It can be decided that first a seamless vertical handover is performed from the current access network to an intermediate access network, and subsequently a seamless vertical handover from the intermediate access network to the target access network is performed.