LTE LPP Non-Final Message Acknowledgment Control
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Solution Overview
Problem
In LTE networks, communication disruptions during non-final location fix reporting can prevent the successful transmission of final location information from user equipment (UE) to the location server, leading to incomplete positioning and potential failures in emergency services.
Innovation Solution
An enhanced LTE protocol for multiple location reporting is introduced, where the UE sends non-final and final LPP messages with specific acknowledgment instructions, ensuring that the location server does not acknowledge non-final messages, allowing for uninterrupted final location fix reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the location server acknowledges receipt of non-final LPP messages, then communication reliability is improved, but the final location fix reporting may be disrupted due to retransmission requirements
Solution Approach 1:
The patent segments the location reporting process into non-final and final phases, applying different acknowledgment rules to each segment. Non-final messages do not trigger acknowledgments, while final messages do, allowing the system to maintain reliability during final reporting without being constrained by retransmission requirements of earlier messages.
Solution Approach 2:
The patent introduces dynamic acknowledgment control where the acknowledgment requirement changes based on the reporting phase. The UE dynamically adjusts its behavior by indicating whether acknowledgment is required for each message type, allowing the system to adapt between reliability-oriented (non-final) and completion-oriented (final) modes.
2Reliability
If the UE requests acknowledgment for all LPP messages, then message delivery certainty is improved, but the final location information transmission may be blocked by retransmission timeouts
Solution Approach 1:
The patent divides the message stream into segments with different acknowledgment requirements. Non-final messages are sent without acknowledgment requests to avoid time-consuming retransmission cycles, while final messages include acknowledgment requests to ensure delivery certainty, optimizing the time management for positioning sessions.
Solution Approach 2:
The patent applies preliminary action by sending non-final location reports before finalizing the acknowledgment strategy. By indicating that acknowledgment is not required for non-final messages, the UE prepares the communication path for faster final message transmission, avoiding potential blocks from previous retransmission timeouts.
3Stability of the object's composition
If the location server returns acknowledgments for non-final messages, then communication stability is improved, but the overall positioning efficiency deteriorates due to repeated retransmissions
Solution Approach 1:
The patent segments the communication into stable (non-final) and efficient (final) phases. Non-final messages are sent without acknowledgment expectations, allowing the system to maintain communication stability during data collection while avoiding retransmission overhead that would reduce positioning efficiency during the critical final reporting phase.
Solution Approach 2:
The patent changes the acknowledgment parameter dynamically based on the message type and reporting phase. By setting acknowledgment requirement to false for non-final messages and true for final messages, the system optimizes the balance between communication stability and positioning efficiency across different stages of the positioning session.
Data Source
AI summary
Techniques described herein are directed toward an enhanced LTE positioning protocol for multiple location reporting (with non-final and final fixes) that can be utilized by a user equipment (UE) to help prevent a disruption of the communication of information for a final location fix from the UE to a location server. In particular, techniques help ensure that the location server will not acknowledge receipt of the information provided by the UE in communication for a non-final fix.