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Small Data Transmission (SDT): Protocol Aspects Small Data Transmission (SDT): Protocol Aspects Taehun Kim Ofinno • ofinno.com • May 2021 Small Data Transmission (SDT): Protocol Aspects Signals for transitioning to a radio resource control • a radio resource control (RRC) connection (RRC) connected state and maintaining the RRC establishment procedure to establish an RRC connected state could cause overheads (e.g., power connection [3][4]; and consumption and delay) to a wireless device having • an initial access stratum (AS) security activation small amount of data to transmit when in an RRC idle procedure for secured data transmission [3][4]. state or an RRC inactive state. When the procedures is successfully completed, the 3rd Generation Partnership Project (3GPP) has wireless device in an RRC connected state transmits introduced technologies to reduce the overheads. the UL data. After the transmission of the UL data, This article gives a brief introduction of the the wireless device stays in the RRC connected technologies and investigates a protocol aspects of state until receiving an RRC release message from the technologies. a base station. While staying in the RRC connected state, the wireless device should perform additional 1. Introduction procedures (e.g., radio link monitoring (RLM), Before technologies to reduce overheads for small measurement & measurement reporting, etc.). The data transmission (SDT) is introduced for long-term wireless device transitions back to the RRC idle state evolution (LTE) or new radio (NR), uplink (UL) data when receiving an RRC release message from the generated in an RRC idle state can be transmitted base station. only after transitioning to an RRC connected state according to 3GPP specifications. After transmission The procedures for the transmission of the UL data of the UL data, a wireless device in the RRC could not be appropriate for SDT. The overheads of connected state needs to receive an RRC release the overall procedure are inefficient to transmit small message for transitioning back to the RRC idle state. amount of data (small data). The overheads become more critical especially for a device requiring low Figure. 1 illustrates an overall procedure from complexity and low power consumption. Thus, generation of the UL data in an RRC idle state to 3GPP has introduced technologies to reduce the transitioning back to the RRC idle state. overheads. According to the 3GPP specifications, when a This article organized as follows: Section 2 describes wireless device in an RRC idle state has UL data, the cellular internet of things (CIoT) optimization which wireless device should perform procedures for the supports early data transmission after transitioning transmission of the UL data where the procedures to an RRC connected state. Section 3 describes comprises: SDT technologies which supports data transmission without transitioning to an RRC connected state. • a random access procedure to synchronize uplink Section 4 provides a summary. timing [1][2]; 2. CIoT optimization 3GPP introduced a suite of two complementary Ofinno • ofinno.com • May 2021 1 a wireless device Random access RRC connection Initial AS security Transmission procedures in RRC Receiving RRC has UL data procedure establishment procedure activation procedure of UL data connected state release message in RRC idle state Transitioning to Transitioning to RRC connected state RRC idle state FIG. 1 Overall procedure from generation of UL data in RRC idle state to transitioning back to RRC idle state narrowband LTE internet of things (IoT) technologies of an RRC connection are introduced. The suspension in Release 13: eMTC (enhanced machine-type of the RRC connection is initiated by a base communication) and NB-IoT (narrowband internet station. When the RRC connection is suspended, of things). Both are optimized for lower complexity/ a wireless device and the base station stores power, deeper coverage, and higher device density, current configuration parameters (e.g., AS security while seamlessly coexisting with other LTE services parameters), a resume identity, and a next hop such as regular mobile broadband. chaining count (NCC) for an AS security activation in next access. The resumption of the suspended 3GPP introduced cellular internet of things (CIoT) RRC connection is initiated by the wireless device. optimization to reduce overheads for data When the RRC connection is resumed by the RRC transmission of eMTC devices and NB-IoT devices connection establishment procedure, the wireless [3]. The CIoT optimization enables a wireless device device (re)activates an AS security based on the NCC to transmit data right after transitioning to an RRC and the AS security parameters. connected state. Based on the CIoT optimization, a wireless device can transmit data without performing For the CP CIoT optimization, data is integrity the initial AS security activation procedure shown in protected and/or ciphered by a non-access stratum Figure 1. (NAS) security of a NAS layer. The AS security activation is not required for the CP CIoT optimization. The CIoT optimization comprises user plane (UP) The CP CIoT optimization enables a wireless device CIoT optimization; and control plane (CP) CIoT to transmit the data via an RRC complete message optimization. A wireless device transmits data via a of the RRC connection establishment procedure. The user plane using the UP CIoT optimization and via a RRC complete message comprises a NAS message control plane (CP) using the CP CIoT optimization, which includes the data and release assistance respectively. For the UP CIoT optimization, a information (RAI). The RAI indicates expected traffic suspension of an RRC connection and a resumption pattern: only one UL transmission being expected; Transmission of UL data a wireless device Random access RRC connection has UL data procedure establishment procedure in RRC idle state Transitioning to RRC connected state FIG. 2 CIoT optimization procedure for transmission of UL data being generated in RRC idle state Ofinno • ofinno.com • May 2021 2 or one UL and one downlink (DL) transmission being connection establishment procedure. The wireless expected. The RAI enables a network to transition device determines that the EDT or the transmission the wireless device to an RRC idle state or an RRC using PUR is successfully completed, when the inactive state as early as possible. It can reduce wireless device in the RRC idle state receives a overheads from the additional procedure in the RRC response message (e.g., Msg 4) from a base station. connected state by reducing the duration of a time The Msg 4 comprises an RRC response message the wireless device stays in the RRC connected state. and/or DL small data. The wireless device transitions back to the RRC idle state or transitions to an RRC 3. Small Data Transmission (SDT) inactive state when receiving the Msg 4. Figure 3 Based on the CIoT optimization, 3GPP has developed illustrates the SDT technologies for 4G LTE. In Figure technologies for SDT to support data transmission 3, a wireless device performs a random access without transitioning to an RRC connected state. procedure for the EDT to receive uplink grant for SDT. 3GPP introduced SDT technologies for 4G LTE in For the transmission using the PUR, a wireless device Release 15 and Release16, and for 5G new radio (NR) transmits UL small data using PUR without performing in Release 17. a random access procedure. A. SDT for 4G LTE The EDT comprises UP EDT and CP EDT. The The SDT technologies for 4G LTE include early data transmission using PUR comprises UP transmission transmission (EDT) and transmission using pre- using PUR and CP transmission using PUR. Small data configured uplink resource (PUR). 3GPP introduced is transmitted via a user plane using the UP EDT or the EDT in Release 15 and the transmission using the UP transmission using PUR; or via a control plane pre-configured uplink resource (PUR) in Release 16 [3]. using the CP EDT or the CP transmission using PUR. The EDT enables a wireless device to receive uplink grant for SDT in an RRC idle state via an random In case of the UP EDT or the UP transmission using access procedure for the EDT. The wireless device in PUR, the suspension and the resumption of an RRC the RRC idle state transmits UL small data using the connection introduced for the UP CIoT optimization uplink grant. The transmission using PUR allows SDT are re-used. Different from the UP CIoT optimization, from an RRC idle state using PUR without performing an early AS security activation is required for a random access procedure. transmission via Msg 3. The AS security is re-activated prior to transmission of the RRC request message A wireless device in an RRC idle state performs the (i.e., an RRC resume request message) using the NCC EDT or the transmission using PUR by transmitting stored during the suspension of the RRC connection. UL small data via Msg 3. The Msg 3 comprises the UL UL small data is integrity protected and/or ciphered small data and an RRC request message of the RRC based on the activated AS security. The UL small data Transmission Reception of of UL data DL data a wireless device Random access RRC connection has UL data procedure establishment procedure in RRC idle state Transitioning to RRC idle/inactive state FIG. 3 SDT technologies for 4G LTE Ofinno • ofinno.com • May 2021 3 is transmitted on a dedicated traffic channel (DTCH) a random access procedure. This work item only multiplexed with the RRC Request message on a considers SDT via user plane like UP SDT for 4G LTE common control channel (CCCH). In the downlink, such as the UP EDT or the UP transmission using PUR. DL small data, if available, are transmitted on a DTCH multiplexed with the RRC response message (i.e., Different from SDT in LTE, this work item investigates an RRC release message) on a dedicated control NR’s radio frequency characteristics on SDT.
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