Network Fallback via Access Network Indication
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Solution Overview
Problem
The existing Circuit Switch FallBack (CSFB) process in LTE systems experiences delays due to complex signaling interactions between terminal devices and core networks, leading to prolonged service interruptions during network fallback.
Innovation Solution
A network fallback method where terminal devices and access network devices exchange indication information to determine if a specific service can be supported in the current network, allowing the service to be initiated in an alternative network, thereby reducing complex signaling interactions and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs complex signaling interactions with the core network during network fallback, then the service can be established in the traditional CSFB process, but the network fallback time is excessively long and service interruption is prolonged
Solution Approach 1:
The access network device acts as an intermediary between the terminal device and the core network. It receives service capability information from the core network and forwards it to the terminal device, enabling the terminal to make informed decisions about network fallback without direct complex signaling interactions with the core network, thus reducing fallback time while maintaining service reliability
Solution Approach 2:
The access network device performs preliminary action by obtaining service capability information from the core network in advance and providing it to the terminal device before the actual service establishment. This preliminary information exchange allows the terminal to prepare for network fallback more efficiently, reducing the time needed during the actual fallback process
2Productivity
If the terminal device initiates service in the current network without network support indication, then the service request can be sent directly, but the terminal cannot know whether the network supports the service leading to potential rejection and additional signaling
Solution Approach 1:
The access network device provides feedback to the terminal device in the form of service capability information indicating whether the network supports specific services. This feedback mechanism allows the terminal to understand network capabilities and make informed decisions about service initiation, improving efficiency by avoiding unnecessary service requests that would be rejected, while the feedback itself is obtained through coordinated signaling between access network and core network
Data Source
AI summary
Disclosed in the present application are a method for enabling a network to fall back, a terminal device and an access network device. The method comprises: a terminal device receives indication information sent by an access network, the indication information being used for indicating whether a first network supports a specific service to be executed by the terminal device; and if the indication information indicates that the first network does not support the specific service, the terminal device initiates the specific service in a second network. When the terminal device cannot initiate a specific service in a current network, the specific service can be initiated in another network based on an instruction of an access network, so that a complex signaling interaction between the terminal device and a core network is avoided, and a delay of a network fallback process is reduced.