8.17 RAT Type
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
RAT Type is coded as depicted in Figure 8.17-1.
|
Bits |
||||||||||
|
Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
||
|
1 |
Type = 82 (decimal) |
|||||||||
|
2 to 3 |
Length = n |
|||||||||
|
4 |
Spare |
Instance |
||||||||
|
5 |
RAT Type |
|||||||||
|
6 to (n+4) |
These octet(s) is/are present only if explicitly specified |
|||||||||
Figure 8.17-1: RAT Type
Table 8.17-1: RAT Type values
|
RAT Types |
Values (Decimal) |
|
<reserved> |
0 |
|
UTRAN |
1 |
|
GERAN |
2 |
|
WLAN |
3 |
|
GAN |
4 |
|
HSPA Evolution |
5 |
|
EUTRAN (WB-E-UTRAN) |
6 |
|
Virtual |
7 |
|
EUTRAN-NB-IoT |
8 |
|
LTE-M |
9 |
|
NR |
10 |
|
WB-E-UTRAN(LEO) |
11 |
|
WB-E-UTRAN(MEO) |
12 |
|
WB-E-UTRAN(GEO) |
13 |
|
WB-E-UTRAN(OTHERSAT) |
14 |
|
EUTRAN-NB-IoT(LEO) |
15 |
|
EUTRAN-NB-IoT(MEO) |
16 |
|
EUTRAN-NB-IoT(GEO) |
17 |
|
EUTRAN-NB-IoT(OTHERSAT) |
18 |
|
LTE-M(LEO) |
19 |
|
LTE-M(MEO) |
20 |
|
LTE-M(GEO) |
21 |
|
LTE-M(OTHERSAT) |
22 |
|
<spare> |
23-255 |
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 [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.