User Terminal Network Selection for Cellular to WLAN Offload
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Solution Overview
Problem
Current communication systems face challenges in effectively interworking between cellular communication systems and wireless LAN systems, leading to inefficient traffic management and network congestion.
Innovation Solution
A communication control method and user terminal that perform network selection operations based on determination parameters such as cellular and wireless LAN network statuses, radio link statuses, movement status, battery status, and power consumption, enabling offloading from cellular RAN to wireless LAN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traffic is concentrated on cellular RAN, then cellular network coverage and reliability are maintained, but network congestion increases and productivity decreases
Solution Approach 1:
The patent segments traffic handling by dividing it between two separate networks: cellular RAN and wireless LAN. This allows traffic to be partitioned based on conditions, with some traffic handled by cellular network and other traffic offloaded to wireless LAN, thereby reducing congestion on cellular network while maintaining overall productivity
Solution Approach 2:
The user terminal acts as an intermediary that selects between cellular RAN and wireless LAN based on determination parameters. This intermediary function enables dynamic traffic distribution, allowing the system to leverage both networks appropriately and reduce cellular network congestion during high-load conditions
2Productivity
If network selection is always performed, then traffic distribution is optimized, but device complexity and power consumption increase
Solution Approach 1:
The patent uses determination parameters (such as signal quality, load conditions, battery status) to dynamically change the network selection state between ON and OFF. By monitoring these parameters and adjusting selection behavior accordingly, the system optimizes traffic distribution while avoiding unnecessary complex selection operations when conditions don't warrant them
Solution Approach 2:
Instead of continuously performing full network selection operations, the system applies partial action by using network selection indicators to configure selection behavior based on current conditions. This allows optimized traffic distribution only when determination parameters indicate it's beneficial, reducing overall device complexity and power consumption
3Adaptability or versatility
If network selection operation is enabled, then interworking between cellular and wireless LAN is enhanced, but loss of energy increases due to continuous monitoring and switching
Solution Approach 1:
The patent implements dynamic network selection where the user terminal can switch between cellular RAN and wireless LAN based on real-time determination parameters. This dynamic adaptability enhances interworking capability by allowing the system to choose the most suitable network, while the selective nature of switching (rather than continuous operation) helps manage power consumption
Solution Approach 2:
The user terminal autonomously performs network selection based on its own determination parameters (battery status, signal quality, etc.) without requiring continuous external control. This self-service approach enhances adaptability while reducing overall system energy consumption by making local, efficient decisions rather than relying on continuous centralized control
Data Source
AI summary
A communication control method for performing an offload from a cellular RAN to a wireless LAN, includes a step of performing, by a user terminal, a network selection operation to select an appropriate access network with which a traffic of the user terminal is exchanged, from the cellular RAN and the wireless LAN on the basis of determination parameters. The determination parameters comprises at least one of: a cellular network status that is a network status concerning the cellular RAN; a wireless LAN network status that is a network status concerning the wireless LAN; a cellular radio link status that is a radio link status between the cellular RAN and the user terminal; and a wireless LAN radio link status that is a radio link status between the wireless LAN and the user terminal.