LTE Positioning Protocol Data Handling and Retransmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the LTE wireless communication system, there is a lack of clear guidance on prioritizing the transmission of LPP messages and NAS messages, leading to potential delays in call establishment, and unclear procedures for handling LPP PDU transmission failures due to handovers or RRC connection re-establishments, resulting in PDU loss.
Innovation Solution
A method is introduced to prioritize NAS messages over LPP messages for transmission and to retransmit LPP PDUs when transmission fails, including mechanisms for handling handovers and RRC connection re-establishments, ensuring successful delivery of LPP PDUs through re-routing via different base stations when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LPP messages are transmitted before NAS messages, then positioning data can be sent, but call establishment is delayed
Solution Approach 1:
The patent applies preliminary action by establishing the LPP protocol configuration before actual positioning data transmission occurs. The LPP message is prepared and configured in advance, allowing the system to quickly switch to positioning transmission once NAS messages are completed, thus avoiding delays while ensuring positioning data can be transmitted reliably.
2Productivity
If LPP PDU transmission continues during handover or RRC re-establishment, then positioning data can be sent, but transmission failure and PDU loss occur
Solution Approach 1:
The patent applies beforehand cushioning by implementing a mechanism that detects handover or RRC re-establishment events and proactively suspends LPP PDU transmission before failure occurs. This preventive measure cushions against transmission failures by stopping positioning data transmission during vulnerable periods when the radio connection is being re-established, thus preventing PDU loss while maintaining overall transmission continuity.
3Loss of energy
If NAS signaling connection is released during LPP PDU transmission, then network resources are freed, but LPP PDU transmission fails
Solution Approach 1:
The patent applies dynamics by making the LPP PDU transmission state adaptive to NAS signaling connection status. The system dynamically adjusts positioning data transmission based on whether the NAS connection is active or being released, suspending LPP transmission when NAS release is detected to prevent failure, while resuming when the connection is re-established, thus balancing resource utilization with transmission reliability.
Data Source
AI summary
A method of handling long term evolution positioning protocol (LPP) data for a mobile device in a wireless communication system is disclosed. The method comprises initiating a transmission for transmitting a protocol data unit (PDU) of a long term evolution positioning protocol (LPP) layer of the mobile device, to a base station of the wireless communication system; and retransmitting the LPP PDU to the base station when the transmission is failed.