Small Data Transmission Timer Control During Mixed RRC Traffic

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing small data transmissions (SDT) due to inefficiencies in handling non-SDT data during SDT procedures, leading to potential failures and suboptimal resource utilization.

Innovation Solution

Implementing a method for wireless devices to manage SDT failure detection timers based on initiating SDT procedures, stopping or continuing them based on non-SDT data arrival, and utilizing RRC messages through dedicated control channels, along with monitoring PDCCH channels to ensure timely completion of SDT processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the wireless device transmits an RRC message for non-SDT data during the SDT procedure, then the non-SDT data can be sent, but the SDT failure detection timer may expire causing SDT failure

Engineering Contradiction:

Improvehandling non-SDT data during SDT procedureVSAvoidSDT procedure completion

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies dynamics by making the SDT failure detection timer configurable and adaptable based on the type of data being transmitted. The network can configure different timer values for SDT and non-SDT procedures, allowing the system to dynamically adjust timer behavior according to the specific data transmission scenario, thereby preventing premature timer expiration when non-SDT data is transmitted during SDT procedure

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by introducing configurable timer values that can be set by the network based on the data transmission type. The network configures a first timer value for SDT procedures and a second timer value for non-SDT procedures, allowing parameter adjustment to match the specific requirements of each transmission scenario, thus resolving the conflict between handling non-SDT data and maintaining SDT reliability

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the wireless device monitors PDCCH continuously to detect SDT completion, then SDT procedure reliability improves, but device power consumption increases

Engineering Contradiction:

ImproveSDT procedure completion detectionVSAvoiddevice power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by implementing discontinuous reception (DRX) cycles for PDCCH monitoring during SDT procedures. Instead of continuous monitoring, the device monitors PDCCH at periodic intervals defined by DRX parameters, which significantly reduces power consumption while maintaining reliable detection of SDT completion through periodic checks for downlink assignments or RRC messages

Inventive Principle:

Principle #19Periodic action

3Device complexity

If the wireless device uses a single timer for both SDT and non-SDT procedures, then device complexity is reduced, but timer expiration conflicts occur

Engineering Contradiction:

Improvetimer managementVSAvoidprocedure completion detection

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies segmentation by dividing the timer management into separate, dedicated timers for different procedures. The network configures a first SDT failure detection timer specifically for SDT procedures and a second timer for non-SDT procedures, allowing each timer to operate independently with its own configuration and expiration logic, thus eliminating timer expiration conflicts while maintaining manageable device complexity through clear separation of concerns

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4335238B1Small data transmission

Publication Date: 2026.04.22 OFINNO LLC

Figure 1A~1B
Figure 2A~2B
Figure 3

AI summary

A wireless device starts a small data transmission, SDT, failure detection timer based on initiating an SDT procedure. The wireless device stops the SDT failure detection timer based on non-SDT data arriving during the SDT procedure.