UE Cell Access Signaling for Stable 4G-to-5G Path Switching
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Solution Overview
Problem
In the process of a user equipment (UE) transitioning from a 4G to a 5G network using non-standalone (NSA) deployment, there is a risk of data interruption and frequent network disconnection due to unsuccessful attempts to access the 5G cell, leading to instability in data transmission.
Innovation Solution
The UE sends first indication information to the network device indicating incomplete access to the 5G cell, allowing the network device to maintain data transmission on the 4G cell, and upon successful access and stable communication with the 5G cell, sends second indication information to switch to the 5G cell for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE attempts to access the 5G cell without indicating incomplete access status, then the network device may switch data transmission path prematurely, but this causes data interruption and network disconnection
Solution Approach 1:
The UE sends first indication information to the network device to feedback the access status. This feedback mechanism allows the network device to know whether the UE has successfully accessed the 5G cell before switching the data transmission path, thereby preventing premature switching and ensuring reliable data transmission.
Solution Approach 2:
The UE sends the first indication information before completing the 5G cell access process. This preliminary action informs the network device in advance that the access is not yet complete, preventing the network device from switching the data transmission path prematurely and avoiding data interruption.
2Speed
If the network device switches data transmission path immediately after receiving configuration information, then the switching speed is improved, but data interruption occurs during unsuccessful access attempts
Solution Approach 1:
The network device receives feedback (first indication information) from the UE about the access status before switching the data transmission path. This feedback ensures that the path switching only occurs when the UE has successfully accessed the 5G cell, maintaining communication continuity while enabling relatively fast switching.
Solution Approach 2:
The UE sends the first indication information in advance to prevent premature path switching. This preliminary indication allows the network device to maintain the current data transmission path until confirmation of successful access, avoiding interruption while preparing for efficient path switching.
3Adaptability or versatility
If the UE continuously attempts to access the 5G cell without status indication, then the network device cannot maintain transmission on 4G cell, but this leads to frequent network disconnection
Solution Approach 1:
The UE provides continuous feedback through the first indication information, informing the network device of the access status. This allows the network device to adaptively maintain data transmission on the 4G cell when access is incomplete, preventing network disconnection while maintaining the capability to switch to 5G when successful.
Solution Approach 2:
The data transmission path is dynamically adjusted based on the access status feedback. When the UE has not completed accessing the 5G cell, the network device maintains transmission on the 4G cell. When access is successful (indicated by second indication information), the network device switches to the 5G cell, providing adaptive network connectivity.
Data Source
AI summary
A cell access method includes: receiving configuration information of a second cell sent by a first network device when a UE accesses a first cell; according to the configuration information of the second cell, sending first indication information to the first network device and executing a process of accessing the second cell, where the first indication information is used for indicating that the UE has not completed accessing the second cell and used for the first network device to maintain data transmission in the first cell; sending second indication information to the first network device when the UE has successfully accessed the second cell and the second cell satisfies a preset condition. The second indication information is used for indicating that the UE has successfully accessed the second cell and used for the first network device to switch a data transmission path from the first cell to the second cell.