Wireless Terminal System Information Acquisition via LA and SA Cells
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Solution Overview
Problem
Current cellular wireless networks face inefficiencies in distributing system information, particularly in energy-efficient architectures, where idle terminals struggle to quickly acquire up-to-date SA-cell and LA-cell system information, leading to delays in session setup and re-camping procedures.
Innovation Solution
A method where terminals in active mode receive SA-cell system information via the SA-cell radio interface and LA-cell system information via the LA-cell radio interface during designated time periods, allowing for the storage and use of this information to facilitate quick data session establishment and re-camping, even when SA-cells are in energy-conserving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If system information is continuously broadcast by cells, then terminals can always obtain up-to-date information, but energy consumption and network resources are wasted
Solution Approach 1:
The patent implements periodic broadcasting of system information by cells instead of continuous transmission. Cells broadcast system information in periodic intervals and can enter low-power states between broadcasts, reducing energy consumption while ensuring terminals can obtain updated information at regular intervals.
Solution Approach 2:
The patent introduces a feedback mechanism where terminals report whether they have successfully acquired system information. Based on this feedback, cells can adjust their broadcasting behavior - continuing periodic broadcasts if information is needed, or reducing/ceasing broadcasts if all terminals have the latest information, thereby optimizing energy usage.
2Loss of time
If SA-cells remain active to provide system information, then data sessions can be established quickly, but energy consumption increases
Solution Approach 1:
The patent enables terminals to acquire SA-cell system information in advance during idle mode, before data sessions are needed. Terminals store this information locally and can quickly re-camp on SA-cells when data sessions are required, eliminating the need for SA-cells to remain continuously active and reducing their energy consumption.
Solution Approach 2:
The patent uses LA-cells as intermediaries to provide system information about SA-cells to terminals. Since LA-cells have larger coverage and remain active longer, they can broadcast SA-cell system information, allowing terminals to obtain the needed information without requiring SA-cells to be continuously active, thus reducing SA-cell energy consumption while maintaining quick session setup.
3Speed
If terminals monitor all cells continuously for system information, then they can quickly find the best cell, but power consumption increases
Solution Approach 1:
The patent segments the cell monitoring task by distinguishing between LA-cells (large area cells for coverage) and SA-cells (small area cells for data). Terminals primarily monitor LA-cells for system information and use this information to identify candidate SA-cells, rather than continuously monitoring all cells, thereby reducing power consumption while maintaining the ability to quickly re-select the best cell when needed.
Data Source
AI summary
The invention relates to a wireless access telecommunications system comprising at least an SA-cell with which a terminal in an active mode is configured to have a data connection and an LA-cell on which the terminal in an idle mode is configured to camp. A method for the terminal to at least obtain LA-cell system information and SA-cell system information includes, when the terminal is in the active mode and an SA-cell radio interface of the terminal is enabled, the terminal receiving at least a part of the SA-cell system information for the terminal from the SA-cell via the SA-cell radio interface. The method further includes enabling an LA-cell radio interface of the terminal during one or more of a plurality of LA time periods and receiving at least a part of the LA-cell system information for the terminal from the LA-cell via the LA-cell radio interface.