CIoT UE Attach Procedure with Mode A Support
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Solution Overview
Problem
The existing communication procedures for Cellular Internet of Things (CIoT) terminals lack clarity on how to attach and detach from a core network, particularly in terms of data transmission methods optimized for CIoT terminals, which are connected through a CIoT Serving Gateway Node (C-SGN) that handles functions of Mobility Management Entity (MME), Serving Gateway (SGW), and Packet Data Network Gateway (PGW).
Innovation Solution
A communication method involving a User Equipment (UE) that transmits an ATTACH REQUEST message to an MME, receives an ATTACH ACCEPT message indicating support for mode A, and subsequently transmits an ATTACH COMPLETE message, allowing the UE to perform processing such as entering an idle mode to keep a UE context or bearer context, based on the acceptance of mode A support. This method includes network capability information in the ATTACH ACCEPT message to confirm mode A support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a CIoT terminal uses traditional attach procedures for core network connection, then connectivity can be established, but communication efficiency and power consumption optimization for CIoT cannot be achieved
Solution Approach 1:
The patent introduces a new parameter 'mode A support' in the attach procedure that enables CIoT terminals to request optimized communication modes. The network responds with capability information indicating mode A support, allowing the terminal to switch to optimized procedures including idle mode entry and context keeping, thereby improving communication efficiency without adding significant procedural complexity
Solution Approach 2:
The patent enables dynamic mode switching between traditional and optimized attach procedures based on network capability information. The CIoT terminal can adaptively choose to enter idle mode and keep UE context when mode A is supported, providing flexible and efficient communication that adjusts to network conditions and terminal requirements
2Speed
If a CIoT terminal maintains connection to core network continuously, then data transmission is fast, but power consumption increases reducing battery life
Solution Approach 1:
The patent implements periodic connection establishment instead of continuous connection. CIoT terminals can enter idle mode and periodically re-establish connections only when data transmission is needed. The attach procedure with mode A support enables quick re-attachment, maintaining fast data transmission when needed while minimizing power consumption during idle periods
Solution Approach 2:
The network automatically provides optimized attach procedures and idle mode capabilities to CIoT terminals without requiring continuous terminal initiation. The network side determines mode A support and manages connection states, reducing terminal power consumption while maintaining transmission readiness
3Adaptability or versatility
If the core network uses separate MME, SGW, and PGW nodes, then network functionality is comprehensive, but device complexity and connection management become cumbersome
Solution Approach 1:
The patent introduces a C-SGN (CIoT Serving Gateway Node) that consolidates the functions of MME, SGW, and PGW into a single multi-functional node for CIoT terminals. This universal node provides comprehensive network functionality while simplifying the core network structure and reducing the number of separate devices required for CIoT connectivity
Data Source
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AI summary
Included are the steps of: receiving an ATTACH ACCEPT message including at least a Packet Data Network (PDN) address from a core network; and establishing a PDN connection and/or a radio bearer for user data transmission and/or reception, based on the PDN address. Thus, a communication procedure such as an attach procedure suitable for a CIoT terminal is provided.