On-Demand System Information Delivery in LTE Base Stations
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Solution Overview
Problem
In existing LTE systems, the periodic broadcasting of all system information by base stations leads to low system resource utilization and high energy consumption, as all system information is broadcasted repeatedly on specific downlink resources, despite only a small number of user equipment (UE) needing specific information.
Innovation Solution
A method where user equipment (UE) sends a system information request message to the base station, and the base station responds with the requested supplementary system information within a defined time window, set as a multiple of the system information change period or minimum system information sending period, allowing for targeted and efficient information delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station periodically broadcasts all system information, then the user equipment can acquire the corresponding information at any time, but the system resource utilization is low and energy consumption is high
Solution Approach 1:
The patent segments system information into two categories: minimum system information (MIB and SIB1) that is periodically broadcast, and other system information (SIB2-SIB22) that is transmitted only upon UE request. This segmentation allows the base station to reduce energy consumption by not broadcasting all system information continuously, while still ensuring UEs can acquire necessary information through targeted requests.
Solution Approach 2:
The patent extracts the unnecessary part from the system information broadcast mechanism. Specifically, it removes the requirement to broadcast all system information blocks (SIB2-SIB22) periodically, retaining only the essential minimum system information (MIB and SIB1) for periodic broadcasting, thereby eliminating energy waste from transmitting redundant information.
2Ease of operation
If the base station periodically broadcasts all system information, then the user equipment can acquire the corresponding information at any time, but the system resource utilization is low
Solution Approach 1:
The patent segments system information into minimum system information (MIB and SIB1) and other system information (SIB2-SIB22). By segmenting this way, the base station can allocate downlink resources more efficiently - using periodic broadcasting only for essential information and using on-demand transmission for other information, thereby improving overall system resource utilization.
Solution Approach 2:
The patent extracts and removes the inefficient part of the system information transmission mechanism - the periodic broadcasting of all system information blocks. By taking out the requirement to broadcast SIB2-SIB22 periodically, the patent eliminates wasted downlink resources while maintaining UE capability to acquire necessary information through requests.
3Loss of energy
If the base station broadcasts only minimum system information periodically, then energy consumption and resource utilization improve, but the user equipment cannot acquire supplementary system information without additional requests
Solution Approach 1:
The patent introduces a feedback mechanism where the UE sends a system information request message to the base station, and the base station responds by transmitting the requested supplementary system information. This feedback-based on-demand transmission mechanism allows UEs to acquire supplementary information (SIB2-SIB22) only when needed, maintaining low energy consumption while providing necessary information acquisition capability.
Data Source
AI summary
The present disclosure provides a method for obtaining supplementary system information, and a corresponding user equipment (UE), and base station. A method used in the UE according to the present invention comprises: sending a system information request message to a base station to request required supplementary system information, and starting a timer simultaneously; and receiving the requested supplementary system information within a time window defined by the timer.