SMF Paging for IoT Suspend Mode Data Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing efficient communication services to devices operating with no battery power or low power, particularly in IoT devices within a 5G network.
Innovation Solution
The method involves a session management function (SMF) in a 5G communication system that receives data notifications from a user plane function (UPF) for a PDU session. If the PDU session is in suspend mode, the SMF transmits a Namf_MT_EnableUEReachability request message to an access and mobility management function (AMF), enabling the device to resume communication without performing a full service request procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full service request procedure is performed to resume communication with an IoT device in suspend mode, then reliable data transmission is achieved, but power consumption increases and network efficiency decreases
Solution Approach 1:
The network performs preliminary actions by sending a paging message to wake the IoT device from suspend mode before data transmission, avoiding the need for a full service request procedure. This preliminary paging action maintains reliability while reducing power consumption by using a lighter-weight wake-up mechanism.
Solution Approach 2:
The communication resumption process is segmented into separate stages: first a paging message wakes the device, then data transmission proceeds. This segmentation allows the system to use different procedures for different phases, optimizing power consumption during the wake-up phase while maintaining reliability during data transfer.
2Reliability
If a full service request procedure is performed to resume communication with an IoT device in suspend mode, then reliable data transmission is achieved, but network efficiency deteriorates
Solution Approach 1:
The network performs a preliminary paging action to wake the device before data transmission, which is more efficient than initiating a full service request procedure. This preliminary action improves network efficiency by reducing the overhead and signaling required to resume communication.
Solution Approach 2:
The communication resumption is segmented into a paging phase and a data transmission phase, allowing the network to use optimized procedures for each. The paging phase uses lightweight signaling to wake the device, while the data phase proceeds with efficient resource allocation, overall improving network productivity.
3Speed
If IoT devices continuously maintain connection to receive data, then immediate data reception is possible, but power consumption increases significantly
Solution Approach 1:
Instead of continuous connection, the device operates in periodic suspend and active cycles. The device suspends connection during idle periods to save power and wakes periodically or upon paging to receive data, achieving a balance between power consumption and data reception capability.
Solution Approach 2:
The network performs preliminary paging to wake the device before data arrival, allowing the device to remain in low-power suspend mode until needed. This preliminary wake-up mechanism enables the device to maintain near-immediate responsiveness while spending most time in power-saving state.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. In accordance with an aspect of the disclosure, a method of a session management function (SMF) in a communication system is provided. The method includes receiving, from a user plane function (UPF), a data notification associated with downlink data for a protocol data unit (PDU) session, identifying whether the PDU session is in a suspend mode, in case that the PDU session is in the suspend mode, transmitting, to an access and mobility management function (AMF), a Namf_MT_EnableUEReachability request message, and receiving, from the AMF, a Namf_MT_EnableUEReachability response message based on the Namf_MT_EnableUEReachability request message.