LWM2M Client State Synchronization via Preliminary Verification
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Solution Overview
Problem
Existing Lightweight Machine-to-Machine (LWM2M) client devices face inefficiencies in registration processes due to limited processing and storage capabilities, leading to high power consumption and potential state synchronization issues upon reconnection to an LWM2M server.
Innovation Solution
The implementation of a method where an LWM2M client device determines its state prior to reconnection, generates an indication of this state, and transmits it to the server for verification. If the state is found to be out of date, the client synchronizes with the server, using a state digest or counter to efficiently update its state without retransmitting all state-modifying messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LWM2M client performs full registration and state synchronization upon reconnection, then the state consistency between client and server is ensured, but power consumption increases and operational efficiency decreases
Solution Approach 1:
The client determines its state prior to reconnection and transmits an indication of this state to the server in advance. The server then verifies whether this indicated state matches the expected state, allowing the client to avoid full synchronization if the state is current, thus reducing power consumption while maintaining reliability
Solution Approach 2:
Instead of performing complete state synchronization upon every reconnection, the system performs only partial verification by comparing the indicated state with the expected state. This partial action approach reduces the operational overhead and energy consumption while ensuring state consistency when needed
2Reliability
If the LWM2M client transmits all state-modifying messages upon reconnection, then complete state synchronization is achieved, but bandwidth consumption increases
Solution Approach 1:
The system extracts only the essential state indication from the client's state history and transmits it to the server for verification. This extraction approach eliminates the need to transmit all state-modifying messages, significantly reducing bandwidth consumption while maintaining state synchronization reliability
Solution Approach 2:
The client prepares and transmits the state indication before reconnection, allowing the server to verify the state in advance. This preliminary action prevents the need for extensive post-reconnection data transmission, reducing overall bandwidth consumption
3Measurement precision
If the LWM2M client performs comprehensive state verification upon reconnection, then state accuracy is ensured, but processing time and operational complexity increase
Solution Approach 1:
The system extracts only the critical state indication from the client's complete state history and transmits it to the server for verification. This extraction eliminates the need for comprehensive state verification, reducing reconnection time while maintaining sufficient state accuracy
Solution Approach 2:
The state determination and indication transmission occurs before reconnection, allowing the server to perform verification in advance. This preliminary action reduces the time required during the actual reconnection process while ensuring state accuracy
Data Source
AI summary
A method of re-establishing a connection between a LWM2M client and an LWM2M server following a reconnection of the LWM2M client to the LWM2M server includes determining, at the LWM2M client, a state of the LWM2M client device prior to reconnection of the LWM2M client, transmitting, to the LWM2M server, an indication of the state of the LWM2M client prior to reconnection of the LWM2M client, and receiving a response from the LWM2M server indicating whether the indicated state of the LWM2M client is an expected state or an unexpected state of the LWM2M client.