MTC Device Triggering via TAU Complete NAS Message
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Solution Overview
Problem
Current machine type communication (MTC) technologies face challenges in efficiently handling MTC device triggering and small packet transmission, particularly in 3GPP LTE systems, due to issues with user plane setup, state changes, security, and complexity in NAS message encoding/decoding, which affect the integrity and confidentiality of uplink data transmission.
Innovation Solution
A method and apparatus for MTC device triggering and small packet transmission using RRC signaling, where a TAU complete message is used to transmit uplink data with integrity and confidentiality protection, avoiding attach or service request procedures during the idle state, and leveraging NAS messages for secure and efficient data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional attach or service request procedures are used for MTC device triggering, then user plane setup and state changes are required, but this increases signaling overhead and complexity
Solution Approach 1:
The patent extracts the MTC device triggering indication from the conventional attach or service request procedures. By delivering the triggering indication through paging message or downlink data notification without requiring full user plane setup, the patent removes unnecessary signaling steps while maintaining the core triggering functionality, thus reducing signaling overhead and procedural complexity
Solution Approach 2:
The patent performs preliminary action by delivering the MTC device triggering indication before establishing full user plane connection. The network can notify the MTC device of upcoming data or triggering events in advance through paging or notification messages, allowing the device to prepare accordingly without requiring complete attachment procedures, thereby reducing signaling overhead
2Quantity of substance
If RRC context is released during idle state, then memory is freed, but uplink data transmission requires re-establishing connection increasing latency
Solution Approach 1:
The patent delivers MTC device triggering indication and uplink data before RRC context is released or while in idle state. By using paging messages or downlink notifications to convey triggering indications and small packets of uplink data, the system utilizes available idle-state resources without requiring connection re-establishment, thus eliminating latency while efficiently using memory resources
Solution Approach 2:
The MTC device can self-serve by monitoring paging messages and downlink notifications for triggering indications while in idle state. The device can autonomously process received uplink data and triggering indications without requiring active connection or additional signaling for context re-establishment, thereby reducing latency and efficiently managing memory resources
3Extent of automation
If conventional MTC triggering is implemented, then device activation is achieved, but integrity and confidentiality of uplink data may be compromised
Solution Approach 1:
The patent introduces security mechanisms as intermediaries between the MTC device and the network. By implementing integrity protection and confidentiality safeguards during the triggering indication delivery and uplink data transmission process, the system maintains automated triggering functionality while ensuring that security protocols protect data integrity and confidentiality throughout the communication process
Data Source
AI summary
A method and apparatus for small packet transmission in response to machine type communication (MTC) device trigger indication are provided. For uplink (UL) transmission of small packet from MTC device in idle state, a tracking area update (TAU) complete non-access stratum (NAS) message is used to protect integrity and confidentiality of UL small packet transmission without attach/service request procedure during idle state. For downlink (DL) transmission of small packet from MTC device in idle state, a TAU accept NAS message is used to protect integrity & confidentiality of DL small packet reception without attach/service request procedure during idle state.