Signals for transitioning to a radio resource control (RRC) connected state and maintaining the RRC connected state could cause overheads (e.g., power consumption and delay) to a wireless device having small amount of data to transmit when in an RRC idle state or an RRC inactive state. 

3rd Generation Partnership Project (3GPP) has introduced technologies to reduce the overheads. This article gives a brief introduction of the technologies and investigates a protocol aspects of the technologies.  

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