Seamless LTE to Wi-Fi Handover via Relay Backhaul
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Providing seamless handover from a macro network to a mobile vehicle network while maintaining robust backhaul connectivity and consistent throughput is challenging, especially when users transition between LTE and Wi-Fi networks, due to interference and bandwidth congestion issues.
Innovation Solution
Establishing a relay connection between cellular base stations for backhaul, using a multi-RAT base station to manage handovers by switching from LTE to Wi-Fi connections while maintaining IP continuity, and employing multipath TCP and dynamic host configuration protocol to optimize resource usage and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile device hands over from LTE to Wi-Fi network, then network coverage and accessibility are improved, but packet loss and connection stability deteriorate
Solution Approach 1:
The system performs preliminary actions by establishing the Wi-Fi connection before completely breaking the LTE connection. The base station configures the mobile device with Wi-Fi parameters and maintains the LTE connection in a suspended state during the transition, ensuring continuous connectivity and preventing packet loss during handover.
Solution Approach 2:
The base station acts as an intermediary that coordinates the handover process between LTE and Wi-Fi networks. It manages the transition by sending handover commands, configuring radio bearers, and coordinating with both networks to ensure seamless connectivity, thereby maintaining connection stability during the network switch.
2Productivity
If LTE spectrum is used for backhaul connection, then mobile base station connectivity is improved, but spectrum interference and congestion worsen
Solution Approach 1:
The system uses Wi-Fi as a copy or alternative backhaul connection to LTE. When LTE backhaul is congested or interfered with, the mobile base station establishes a parallel Wi-Fi backhaul connection that replicates the data transmission function, thereby reducing dependence on LTE spectrum and minimizing interference.
Solution Approach 2:
The system dynamically changes the backhaul connection parameters by switching between LTE and Wi-Fi frequency bands based on spectrum conditions. When LTE interference is detected, the base station transitions to Wi-Fi backhaul, changing the operational frequency parameter to avoid congested spectrum and reduce interference.
3Ease of operation
If seamless handover is implemented between networks, then user experience is improved, but system complexity and resource management difficulty worsen
Solution Approach 1:
The handover process is designed to be self-service at the mobile device level. The base station provides configuration parameters and commands, but the mobile device autonomously executes the connection switching, manages radio bearers, and coordinates with networks, reducing the operational burden on the base station and simplifying system management.
Data Source
AI summary
A localized method for performing handover of a mobile device at a mobile base station is disclosed, comprising: establishing, at a cellular base station, a relay connection with a second base station for backhaul; receiving a handover request for a mobile device, the handover request including an IP address; receiving, at the cellular base station, a handover confirmation message from the mobile device following handover authorization for the mobile device; sending, from the cellular base station, a request to the mobile device to shut down a cellular radio connection with the cellular base station; and establishing, using the IP address and a non-cellular radio, a data connection with the mobile device on the same IP address, thereby performing a handover of the mobile device for providing continued IP connectivity for the mobile device at the cellular base station.