3GPP 24.501 v20.0.0 — the document's own text
D.6.4 UPSI list
Taught in 5. Finding your way around TS 24.501 (CT1 — the group that writes what your phone says, in depth), 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The purpose of the UPSI list information element is to transfer from the UE to the PCF a list of UPSIs.
The UPSI list information element is coded as shown in figure D.6.4.1, figure D.6.4.2, and table D.6.4.1.
The UPSI list information element has a minimum length of 3 octets and a maximum length of 65532 octets.
NOTE: A PCF implementing a previous version of the present specification will expect the UPSI list information element to have a minimum length of 10 octets and could be unable to decode a UPSI list information element with a length of 3 octets i.e. a UPSI list information element not containing any UPSI.
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| UPSI list IEI | octet 1 | |||||||
| Length of UPSI list contents | octet 2octet 3 | |||||||
| UPSI sublist (PLMN 1) | octet 4*octet a* | |||||||
| UPSI sublist (PLMN 2) | octet a+1*octet b* | |||||||
| … | octet b+1*octet c* | |||||||
| UPSI sublist (PLMN N) | octet c+1*octet z* |
Figure D.6.4.1: UPSI list information element
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| Length of UPSI sublist | octet doctet d+1 | |||||||
| MCC digit 2 | MCC digit 1 | octet d+2 | ||||||
| MNC digit 3 | MCC digit 3 | octet d+3 | ||||||
| MNC digit 2 | MNC digit 1 | octet d+4 | ||||||
| UPSC 1 | octet d+5octet d+6 | |||||||
| UPSC 2 | octet d+7*octet d+8* | |||||||
| … | octet d+9*octet e* | |||||||
| UPSC M | octet e+1*octet e+2* |
Figure D.6.4.2: UPSI sublist
Table D.6.4.1: UPSI list information element
| Length of UPSI list contents (octets 2 to 3) |
|---|
| This field indicates the length of the UPSI list contents. If no UPSIs are included in the UPSI list, the UE shall set the length of UPSI list contents to zero. |
| MCC, Mobile country code (octet d+2, and bits 4 to 1 of octet d+3) |
| The MCC field is coded as in ITU-T Recommendation E.212 [42], annex A. |
| MNC, Mobile network code (bits 8 to 5 of octet d+3, and octet d+4) |
| The coding of this field is the responsibility of each administration but BCD coding shall be used. The MNC shall consist of 2 or 3 digits. If a network operator decides to use only two digits in the MNC, MNC digit 3 shall be coded as "1111".(NOTE) |
| UPSC (octets d+5 to d+6) |
| This field contains the binary encoding of the UPSC. The value of the UPSC is set by the PCF. |
| NOTE: The UE operating in the SNPN access operation mode shall include the PLMN ID part of the SNPN identity in the UPSI sublist. |