5G Positioning Assistance Data Request via SIB1 Scheduling
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Solution Overview
Problem
In 5G mobile communication systems, there is a challenge in accurately requesting and utilizing positioning assistance data for terminal positioning, particularly in scenarios where terminals are in RRC_INACTIVE or RRC_CONNECTED states, due to limitations in scheduling information and the availability of positioning reference signals.
Innovation Solution
The solution involves receiving scheduling information from a base station, requesting positioning System Information Blocks (SIB) based on this information, and transmitting messages to acquire Physical Cell Identity and related data for positioning assistance, enabling efficient positioning even in inactive states by managing uplink and downlink messages effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal requests positioning assistance data in RRC_INACTIVE state, then positioning can be performed without full RRC connection, but the scheduling information for positioning SIB may not be available
Solution Approach 1:
The base station performs preliminary actions by configuring and broadcasting positioning SIB in advance during RRC_CONNECTED state, so that when the terminal transitions to RRC_INACTIVE state, the positioning assistance data is already prepared and can be requested without waiting for real-time scheduling information.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station stores and manages positioning SIB information independently of real-time RRC connection state. The terminal can access this pre-configured information through a simplified request procedure in RRC_INACTIVE state, bridging the information availability gap between connection states.
2Reliability
If the terminal requests positioning SIB in RRC_CONNECTED state, then positioning assistance data can be obtained, but the message transmission complexity increases
Solution Approach 1:
The patent segments the positioning assistance data into different components: positioning SIB (containing PRS configuration) and RequestAssistanceData message. By separating these elements, the terminal can request only the necessary positioning SIB information in a structured manner, reducing the complexity of message transmission while ensuring reliable data acquisition.
3Adaptability or versatility
If positioning reference signals are configured for downlink, then downlink positioning can be performed, but uplink positioning capability is limited
Solution Approach 1:
The patent implements universality by configuring the base station to transmit positioning reference signals for both downlink and uplink directions. The positioning SIB includes configuration information for PRS in both directions, enabling the terminal to perform positioning measurements using either downlink or uplink signals, thereby supporting multiple positioning methods and improving overall adaptability while maintaining measurement accuracy.
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving by a terminal from a base station a SIB1 comprising a first scheduling information and a second scheduling information, transmitting to request the second positioning SIB a first uplink message based at least in part on the second scheduling information if the terminal is in RRC_INACTIVE, transmitting to request the second positioning SIB a second uplink message based at least in part on the second scheduling information if the terminal is in RRC_CONNECTED, acquiring a SI based on the first scheduling information and the second scheduling information the SI includes a positioning SIB and transmitting to request the second PRS data a RequestAssistanceData the RequestAssistanceData includes a physical cell identity of Primary Cell and a second identifier related to the second PRS data.