RRC Release Delivery of LPP Messages for Idle NR Positioning
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Solution Overview
Problem
Current 5G new radio (NR) systems face challenges in positioning terminal devices when they are in a non-connected state, leading to delays and increased power consumption.
Innovation Solution
A communication method that enables the transmission of LPP messages to terminal devices in a non-connected state through RRC release messages, utilizing various protocol data units (PDUs) and dedicated NAS-messages to ensure privacy and layer isolation, allowing devices to report positioning information without establishing a network connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device enters a connected state to receive LPP messages, then the positioning function can be performed, but the time delay and power consumption increase
Solution Approach 1:
The access network device performs preliminary action by embedding the LPP message into the RRC release message before the terminal device enters connected state. This allows the positioning message to be delivered in advance, eliminating the need for the terminal device to establish a connection solely for positioning purposes, thus reducing time delay while maintaining positioning reliability.
2Reliability
If the terminal device enters a connected state to receive LPP messages, then the positioning function can be performed, but the power consumption increases
Solution Approach 1:
The system performs preliminary action by delivering the LPP message through the RRC release message before the terminal device establishes a connected state. This eliminates the need for the terminal device to activate its full communication stack and maintain a connected state solely for positioning, thereby significantly reducing power consumption while ensuring the positioning function remains reliable.
Solution Approach 2:
The invention extracts the LPP message from the traditional connected-state positioning流程 and embeds it into the RRC release message. This separation allows the positioning function to be decoupled from the data connection establishment, enabling the terminal device to receive positioning messages without entering a power-intensive connected state.
3Loss of time
If the LPP message is transmitted through RRC release message, then the time delay is reduced, but the protocol complexity increases
Solution Approach 1:
The invention merges the LPP message transmission with the existing RRC release message structure. By combining these two message types, the system leverages the already-established RRC release mechanism to carry positioning information, avoiding the need for separate message channels and minimizing additional protocol complexity while achieving reduced time delay.
Solution Approach 2:
The RRC release message is given multi-functionality by embedding both the release instruction and the LPP positioning message within the same message structure. This universal approach allows a single message to serve multiple purposes: releasing the terminal device from connected state and simultaneously delivering positioning information, thereby reducing overall system complexity.
Data Source
AI summary
Embodiments of this application disclose a communication method and a related apparatus thereof, to implement positioning of a terminal device in a non-connected state. The method in embodiments of this application includes: A terminal device sends a radio resource control RRC resume request message to an access network device; and the terminal device receives an RRC release message from the access network device, where the RRC release message includes a long term evolution system positioning protocol LPP message, and the LPP message is from a positioning device.