Cellular to WLAN Offload Thresholds for Power and Load Management
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Solution Overview
Problem
Current technologies face challenges in effectively interworking between cellular communication systems and wireless LAN systems, leading to inefficient load management and increased power consumption in user terminals.
Innovation Solution
A user terminal and method that include a chipset capable of transmitting and receiving parameters for offloading from a cellular radio access network to a wireless LAN, using thresholds for signal strength and load levels to facilitate network selection and optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user terminal continuously monitors both cellular and wireless LAN signal strengths to enable seamless offloading, then the network selection reliability is improved, but the power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles that dynamically adjust the monitoring parameters for wireless LAN access points. During DRX active periods, the terminal monitors signal strengths and thresholds; during DRX sleep periods, monitoring is suspended. This parameter-based time-division approach maintains network selection reliability while significantly reducing power consumption compared to continuous monitoring.
2Adaptability or versatility
If the user terminal performs frequent network scans to detect available wireless LAN access points, then the adaptability of network selection is improved, but the loss of time for communication increases
Solution Approach 1:
The patent employs periodic scanning synchronized with DRX cycles rather than continuous scanning. The terminal scans for wireless LAN access points at predetermined intervals during DRX active periods, maintaining adaptability to network conditions while minimizing communication time loss by avoiding frequent interruptions during DRX sleep periods.
3Measurement precision
If the base station provides detailed offloading parameters including multiple thresholds for signal strength and load, then the precision of network selection is improved, but the device complexity increases
Solution Approach 1:
The patent segments the network selection decision process into distinct threshold comparisons: first threshold for cellular signal strength, second threshold for wireless LAN signal strength, and third threshold for load level. This segmentation allows the terminal to process multiple parameters systematically through a standardized evaluation flow, reducing the perceived complexity while maintaining high selection precision.
Data Source
AI summary
A base station and method thereof includes transmitting from the base station to a user equipment, parameters for an offload from the cellular RAN to a wireless local area network (LAN). The parameters are used by the user equipment to perform an access network selection between the cellular RAN and the wireless LAN, and include a first threshold for comparison with a cellular signal strength of the cellular RAN, a second threshold for comparison with a wireless LAN signal strength of the wireless LAN, and a third threshold for comparison with a load of the wireless LAN. When performing access network selection, the parameters may cause the user equipment to perform the offload, in response to the cellular signal strength being lower than the first threshold, the wireless LAN signal strength being higher than the second threshold, and the load of the wireless LAN being lower than the third threshold.