8.49 Fully Qualified Cause (F-Cause)
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
Fully Qualified Cause (F- Cause) is coded as depicted in Figure 8.49-1.
|
Bits |
||||||||||
|
Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
||
|
1 |
Type = 119 (decimal) |
|||||||||
|
2 to 3 |
Length = n |
|||||||||
|
4 |
Spare |
Instance |
||||||||
|
5 |
Spare |
Cause Type |
||||||||
|
6 to (n+4) |
F-Cause field |
|||||||||
Figure 8.49-1: Full Qualified Cause (F-Cause)
The value of Instance field of the F-Cause IE in a GTPv2 message shall indicate whether the F-Cause field contains RANAP Cause, BSSGP Cause or S1-AP Cause.
All spare bits shall be set to zeros by the sender and ignored by the receiver.
F-Cause field is coded as follows:
– For RANAP Cause, the F-Cause field shall contain a non-transparent copy of the cause value of the corresponding IE (see clause 8.2.2), "Cause", as defined in clause 9.2.1.4 in 3GPP TS 25.413 [33].
Cause Type field shall be ignored by the receiver. The value of F-Cause field (which has a range of 1..512) is transferred over the Iu interface and encoded into two octet as binary integer.
– For BSSGP Cause, the F-Cause field shall contain a non-transparent copy of the cause value of the corresponding IE (see clause 8.2.2), "Cause", as defined in clause 11.3.8 in 3GPP TS 48.018 [34].
Cause Type field shall be ignored by the receiver. The value of F-Cause field (which has a range of 0..255) is transferred over the Gb interface and encoded into one octet as binary integer.
– For S1-AP Cause, the F-Cause field shall contain a non-transparent copy of the cause value of the corresponding IE (see clause 8.2.2), "Cause", as defined in clause 9.2.1.3 in 3GPP TS 36.413 [10].
Cause Type field shall contain the RAN Cause subcategory as specified in 3GPP TS 36.413 [10] and it shall be encoded as in Table 8.49-1. The value of F-Cause field (and the associated RAN cause subcategory) is transferred over the S1-AP interface and encoded into one octet as binary integer.
Table 8.49-1: Cause Type values and their meanings
|
Cause Type |
Values (Decimal) |
|
Radio Network Layer |
0 |
|
Transport Layer |
1 |
|
NAS |
2 |
|
Protocol |
3 |
|
Miscellaneous |
4 |
|
<spare> |
5 to15 |