name: RAT
full_form: Radio Access Technology
context: RAT Type is coded as depicted in Figure 8.17-1. Figure 8.17-1: RAT Type Table 8.17-1: RAT Type values NOTE 1: For S4-SGSN, currently it is only possible to detect the difference between GERAN and UTRAN when GERAN Gb mode is used. If GERAN Iu mode is used, then an S4-SGSN may not be able to detect the difference between GERAN and UTRAN. Across the Gb interface, the SGSN may also not be able to detect the difference between GERAN and GAN. If S4-SGSN cannot detect that the HSPA Evolution 3GPP TR 25.999 [46] network is behind the Iu interface, the S4-SGSN will send the "UTRAN" RAT Type. NOTE 2: For the Iu interface case, if the SGSN detects UTRAN or HSPA, it sets the RAT-Type to "UTRAN". If the SGSN detects HSPA+, it sets the RAT-Type to "HSPA Evolution", otherwise the SGSN will send the "UTRAN" RAT Type. NOTE 3: The MME sets the LTE-M RAT-Type for a UE accessing E-UTRAN and indicating Category M from the eNB or sets the LTE-M Satellite RAT types for a UE accessing satellite E-UTRAN and indicating Category M from the eNB, as specified in 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [3]. NOTE 4: The MME sets the RAT-Type to WB-E-UTRAN(LEO) / WB-E-UTRAN(MEO) / WB-EUTRAN(GEO) / WB-E-UTRAN(OTHERSAT) for a UE accessing E-UTRAN with satellite access (EUTRAN-LEO, EUTRAN-MEO, EUTRAN-GEO or EUTRAN-OTHERSAT), and without indicating Category M satellite from the eNB. NOTE 5: The MME sets the RAT-Type to EUTRAN-NB-IoT(LEO) / EUTRAN-NB-IoT(MEO) / EUTRAN-NB-IoT(GEO) / EUTRAN-NB-IoT(OTHERSAT) for a UE accessing EUTRAN-NB-IoT with satellite access (NBIoT-LEO, NBIoT-MEO, NBIoT-GEO or NBIoT-OTHERSAT). NOTE 6: The MME sets the RAT-Type to LTE-M(LEO) / LTE-M(MEO) / LTE-M(GEO) / LTE-M(OTHERSAT) for a UE accessing E-UTRAN with satellite access (EUTRAN-LEO, EUTRAN-MEO, EUTRAN-GEO or EUTRAN-OTHERSAT) and indicating Category M satellite from the eNB.
description: Radio Access Technology (RAT) refers to the standards and protocols used for accessing a wireless network. In the context of 3GPP, RAT is crucial for identifying the type of radio access technology being used by a user equipment (UE), such as GERAN, UTRAN, LTE, or others. The RAT Type is coded and sent across different interfaces in the network to ensure proper handling of UE connections and mobility management.
explanation: RAT is classified under Technology because it encompasses various standards for radio access, which are fundamental to wireless communication networks. Understanding the specific RAT being used by a UE is essential for network functions like the MME (Mobility Management Entity) and SGSN (Serving GPRS Support Node) to manage sessions, mobility, and other network operations effectively.
section_title: 8.17 RAT Type
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