User Equipment On-Demand System Information Acquisition
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Solution Overview
Problem
In conventional mobile communication systems, transmitting system information to user equipment results in increased overheads, especially when specific user equipment is not present or already has the necessary information, and there is a lack of efficient methods for handling changes in system information between cells and requesting specific information from user equipment.
Innovation Solution
A user equipment is designed to receive change messages from the base station and request the transmission of system information when necessary, using a receiving unit and control unit to manage the acquisition of updated system information on demand, reducing unnecessary broadcasts and optimizing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is periodically transmitted from the base station to all user equipment, then all user equipment can acquire necessary system information, but transmission overheads increase when specific user equipment is not present or already has the information
Solution Approach 1:
The system dynamically switches between periodic transmission mode and on-demand transmission mode based on whether specific user equipment is present in the cell. When specific user equipment is detected, the base station transitions to on-demand transmission; otherwise, it reverts to periodic transmission, making the system adaptable to changing conditions
Solution Approach 2:
The base station receives feedback from user equipment indicating whether they have already acquired the necessary system information. Based on this feedback, the base station determines whether to continue periodic transmission or stop transmission, thereby avoiding unnecessary overhead while ensuring information availability
2Reliability
If system information is transmitted periodically to ensure availability, then all user equipment can access the information, but the transmission continues even when user equipment does not need updates
Solution Approach 1:
User equipment that has already acquired system information autonomously notifies the base station of their status. The base station then uses this self-reported information to adjust transmission behavior, eliminating the need for continuous periodic transmission to equipment that does not require updates
3Loss of energy
If on-demand system information transmission is implemented to reduce overheads, then unnecessary transmissions are reduced, but mechanisms for handling changes and differences between cells are not established
Solution Approach 1:
The system segments system information into different categories (common information, cell-specific information, user-specific information) and applies different transmission strategies to each segment. This allows the base station to reduce overhead for common information while maintaining adaptability for cell-specific and user-specific information
Solution Approach 2:
The base station changes transmission parameters (transmission period, transmission mode) based on detected conditions such as presence of specific user equipment, changes in system information, and cell-specific requirements, enabling flexible adaptation to different scenarios
Data Source
AI summary
A user equipment that communicates with a base station in a mobile communication system includes: a receiving unit that receives a change message of system information from the base station; and a control unit that requests the base station to transmit the system information when the receiving unit has received the change message and then has not received the system information.