Timer Control for Early Data Transmission in IoT Random Access
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Solution Overview
Problem
Current mobile communication systems do not support early data transmission during the random access procedure for machine type communication (MTC) and Internet of Things (IoT) radio terminals, which limits their efficiency due to the lack of a mechanism for transmitting user data during this process.
Innovation Solution
A method and apparatus for user equipment to perform early data transmission by starting a timer for cell reselection operations, receiving an Early Data Complete message to confirm successful transmission, and stopping or restarting the timer based on specific parameters, enabling uplink data transmission during the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If early data transmission is implemented during random access procedure, then communication efficiency is improved, but system complexity increases due to lack of support mechanism
Solution Approach 1:
The patent applies preliminary action by enabling early data transmission during the random access procedure before the RRC connection is fully established. The user equipment transmits uplink data in Msg3 during the random access procedure, and the network prepares for downlink data transmission in advance, allowing data to be transmitted earlier than in conventional procedures without requiring full RRC connection setup first.
Solution Approach 2:
The patent implements dynamics by introducing flexible timer control mechanisms that adaptively manage the holding time of cell reselection parameters. The timer is stopped when Early Data Complete message is received, and restarted when parameters are received, allowing dynamic adjustment of cell reselection behavior based on the early data transmission status and network conditions.
2Adaptability or versatility
If timer control for cell reselection is added, then cell reselection operation is maintained during early data transmission, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing automatic timer management where the user equipment autonomously stops the timer upon receiving the Early Data Complete message and restarts it when cell reselection parameters are received. This self-managing mechanism maintains cell reselection capability during early data transmission without requiring external network control or complex manual configuration.
Solution Approach 2:
The patent implements feedback by using the Early Data Complete message as a trigger signal to stop the timer, and by monitoring for cell reselection parameters to restart the timer. This feedback-based control ensures that cell reselection operations are appropriately activated and deactivated based on the actual data transmission status and network conditions.
Data Source
AI summary
A method according to one embodiment is used in a user equipment configured to perform early data transmission in which uplink data is transmitted during random access procedure. The method comprises starting a timer that determines a holding time of parameters used for cell reselection operation; receiving an Early Data Complete message used to confirm successful completion of the early data transmission, after the random access procedure has started; stopping the timer in response to receiving the Early Data Complete message; and starting the timer in response to the Early Data Complete message including the parameters used for cell reselection operation.