Heterogeneous Network Handover via Core Network Signaling
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Solution Overview
Problem
There is no apparatus or method for seamless handover between broadband wireless communication systems and heterogeneous networks when a dual-mode dual-band terminal travels outside the coverage area of the broadband wireless communication system, leading to call drops and service interruptions.
Innovation Solution
An operating method and apparatus for handover between broadband wireless communication systems and heterogeneous communication systems, involving periodic signal strength reports, channel allocation information exchange, and handover processing through a core network, allowing seamless transitions by requesting and receiving radio channel parameters for handover to a heterogeneous communication system when the signal level falls below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual-mode dual-band terminal travels outside the coverage area of the broadband wireless communication system, then the terminal can access heterogeneous communication systems, but service interruption and call drops occur without seamless handover capability
Solution Approach 1:
The base station performs preliminary measurements of heterogeneous network signal strength and sends measurement reports to the terminal before the terminal actually needs to hand over. This advance preparation ensures that when the terminal exits broadband coverage, the handover can execute immediately without service interruption, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The system implements continuous feedback loops where the base station measures heterogeneous network signal strength, reports to the terminal, and receives confirmation. This feedback mechanism ensures that handover decisions are based on real-time conditions, maintaining service continuity while enabling seamless transition to heterogeneous networks.
2Reliability
If the base station continuously measures heterogeneous network signal strength and sends reports to the terminal, then seamless handover is enabled, but signaling overhead and network complexity increase
Solution Approach 1:
The continuous measurement and reporting mechanism is applied selectively only in border cells where heterogeneous network handover is needed, rather than across the entire broadband wireless communication system. This localized approach maintains service continuity at critical handover points while minimizing overall network complexity and signaling overhead.
3Ease of operation
If the terminal attempts to reconnect through the heterogeneous communication system after call drop, then the terminal can restore service, but service interruption has already occurred
Solution Approach 1:
The terminal receives preliminary measurement reports from the base station containing heterogeneous network access information before actually needing to reconnect. This advance provision of handover parameters enables the terminal to immediately connect to the heterogeneous network without the time-consuming process of searching and establishing new connections, eliminating service interruption while maintaining ease of terminal operation.
Data Source
AI summary
An operating method, a base station, and terminal of a cell of a first communication system for a handover between the first communication system and a second communication system are provided. The method includes, receiving, by the base station, a measurement report including measured signal quality, from a terminal, determining, by the base station, a handover initiation to a target radio access network, based on the measured signal quality, transmitting, by the base station, a handover request message to the target radio access network via a core network, receiving, by the base station, radio-related information that is required if the terminal accesses the target radio access network, from the target radio access network via the core network, and transmitting, by the base station, the radio-related information of the target radio access network, to the terminal, wherein the handover between the source radio access network and the target radio access network comprises an inter radio access technology (RAT) handover.