Multi-radio Interworking for Cellular-WLAN Traffic Offloading
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Solution Overview
Problem
The growing demand for mobile data services exceeds the capacity of 4G wireless networks, with limited spectral efficiency and available spectrum, leading to anticipated capacity exhaustion, and existing technologies have not effectively addressed how different radio interfaces on a device can interwork to improve transmission efficiency and share resources.
Innovation Solution
A method for multi-radio interworking that enables a serving base station in a cellular network to obtain and forward WLAN information to a device, allowing it to connect to both cellular and WLAN networks, offload traffic to WLAN when in coverage, and deactivate when leaving coverage to conserve power, thereby improving efficiency and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-radio integration is implemented to explore more bandwidth from different radio access networks, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces a network controller as an intermediary that coordinates between cellular and WLAN networks. The controller receives traffic information from the base station, determines whether to offload traffic to WLAN, and manages the multi-radio device's connection state. This intermediary approach resolves the technical contradiction by centralizing the complexity in the network infrastructure rather than the device, allowing the device to benefit from improved transmission efficiency while the network controller handles the coordination complexity.
2Productivity
If the device continuously monitors and switches between cellular and WLAN networks to optimize bandwidth usage, then resource utilization is improved, but power consumption increases
Solution Approach 1:
The patent implements preliminary action by having the network controller pre-determine traffic offloading decisions based on network conditions, device state, and traffic characteristics. The controller sends control messages to the device in advance, instructing it to switch to WLAN or remain on cellular network. This eliminates the need for the device to continuously monitor and make its own switching decisions, thereby improving resource utilization while reducing the device's power consumption as it only needs to execute pre-determined switching commands.
3Productivity
If the device maintains simultaneous connections to both cellular and WLAN networks, then transmission efficiency is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements dynamic connection management where the device's network connection state is flexibly adjusted based on real-time traffic requirements and network conditions. The network controller dynamically determines whether the device should maintain simultaneous connections to both cellular and WLAN networks, or switch to a single network. This dynamic approach allows transmission efficiency to be improved when simultaneous connections are beneficial, while avoiding unnecessary device complexity and power consumption when single-network operation is sufficient.
Data Source
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AI summary
A method of multi-radio interworking to provide integrated cellular and WLAN access for a multi-radio device is provided. A serving base station in a cellular network first obtains wireless local area network (WLAN) information and then forward the WLAN information to a serving device such that the serving device is capable to connect with both the cellular network and a WLAN. The WLAN information may comprise scanning information, WLAN QoS information, WLAN layer-3 information, or additional WLAN access point information. The WLAN information is forwarded based on triggering events associated with the serving base station information, WLAN coverage information, or the serving device information. Based on the received WLAN information, when entering WLAN coverage, the serving device activates its WLAN access to forward traffic from the cellular access network to the WLAN access network. When leaving WLAN coverage, the serving device deactivates its WLAN access to save power consumption.