Inter-system Air Interface Redirection for LTE UMTS Signaling Reduction
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Solution Overview
Problem
In LTE and UMTS coexistence scenarios, the existing service switching methods are complex, leading to frequent signaling interactions and prolonged call setup delays, negatively impacting user experience due to the complexity of redirecting connections between different network modes.
Innovation Solution
A method for inter-system air interface connection redirection, where a first mode network device receives a connection request from a UE, makes a redirection decision based on load information and service type, and notifies a second mode network device to allocate connection setup parameters, allowing the UE to establish a connection directly with the second mode network device without re-selecting a cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing redirection method is used to switch services between LTE and CS networks, then service switching can be achieved, but signaling interactions are frequent, operation procedures are complicated, and call setup delay is large
Solution Approach 1:
The network device pre-allocates resource information for the target cell before the UE actually needs to switch. When a service switching event occurs, the pre-prepared resource information is immediately provided to the UE, eliminating the need for the UE to perform time-consuming cell re-selection and connection setup procedures, thus significantly reducing call setup delay while maintaining reliable service switching
2Adaptability or versatility
If the existing redirection method is used, then service switching between systems can be implemented, but the operation procedure is complicated and signaling interaction is frequent
Solution Approach 1:
The invention extracts and separates the resource allocation function from the complex redirection procedure. The network device independently allocates and stores resource information for target cells in advance, then simply provides this pre-prepared information to the UE during switching events. This extraction of the resource allocation step from the overall redirection process simplifies the operation procedure and reduces signaling interactions while maintaining inter-system service switching capability
Data Source
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AI summary
The present invention discloses a method, device and system for inter-system air interface connection redirection. The method includes: receiving, by a first mode network device, a connection request message sent in a first mode cell by a user equipment UE, and making a redirection decision; after the first mode network device determines to redirect the UE to a second mode cell managed by a second mode network device, sending a notification message to request the second mode network device to allocate a connection setup parameter for the UE; receiving, by the first mode network device, a response message that carries the connection setup parameter and is sent by the second mode network device, and sending the connection setup parameter to the UE, so that the UE sets up a connection with the second mode network device according to the connection setup parameter. By adopting the embodiments of the present invention, a signaling overhead can be saved during redirection, a connection setup delay can be shortened, and user experience can be improved.