5G to 3G Voice Service Continuity via Network Indication
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Solution Overview
Problem
Current communication networks face challenges in maintaining service continuity and determining access domains when there is no full coverage, particularly when a terminal moves out of a 5G network and into a 3G network, leading to interrupted voice services due to the lack of interworking between 5G and 3G networks.
Innovation Solution
A method is implemented involving network units and terminals that obtain and analyze related information to determine indication information for service operations between different network domains, enabling handovers and service continuity by supporting necessary interfaces and capabilities, such as Sv and N26 interfaces, to ensure seamless voice service transitions from 5G to 3G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If 5G network adopts hotspot coverage rather than full coverage, then network deployment cost is reduced, but service continuity is compromised when terminal moves out of 5G coverage
Solution Approach 1:
The patent introduces an intermediary mechanism (network operation information and indication information) that mediates between 5G and 3G networks. The first network unit obtains operation information from the 5G network, determines indication information, and transmits it to the terminal. This intermediary information exchange enables seamless service continuity between networks without requiring full 5G coverage, thus resolving the contradiction between reduced deployment cost and maintained service continuity.
2Device complexity
If 5G network does not support direct interworking with 3G network, then 5G network complexity is reduced, but voice service availability deteriorates when terminal needs to move to 3G network
Solution Approach 1:
The patent applies preliminary action by having the first network unit obtain operation information from the 5G network in advance and determine indication information before the terminal actually needs to move networks. The indication information is prepared and transmitted to the terminal beforehand, enabling the terminal to proactively switch to 3G network when needed. This preliminary preparation maintains voice service availability without requiring complex real-time interworking mechanisms between 5G and 3G networks.
3Speed
If terminal directly initiates voice service on 5G network, then service initiation speed is improved, but service reliability deteriorates when moving out of 5G coverage area
Solution Approach 1:
The patent implements feedback by having the first network unit obtain operation information from the 5G network status, determine indication information reflecting current network capabilities, and transmit this feedback to the terminal. The terminal uses this feedback information to make informed decisions about service initiation and network selection. This feedback mechanism ensures both fast service initiation when 5G is available and reliable service continuity when moving to 3G, resolving the contradiction between speed and reliability.
Data Source
AI summary
The present disclosure provides a method for implementing service, a network unit and a terminal. The method for implementing service, operable by a terminal, includes: obtaining indication information for an operation from a first network to a second network; determining an operation for the related service, according to the indication information for the operation from the first network to the second network.