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Content for  TS 24.502  Word version:  19.0.0

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9.3.2 EAP-5G method  9.3.2.1 General  9.3.2.2 Message format  9.3.2.2.1 EAP-Request/5G-Start message  9.3.2.2.2 EAP-Response/5G-NAS message 
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9.3.2  EAP-5G method  p. 98

9.3.2.1  General  p. 98

The messages of EAP-5G method are EAP requests and EAP responses as specified in Section 4.1 of RFC 3748 and use coding of the expanded method type as described in Section 5.7 of RFC 3748.
The sending entity shall set the value of a spare bit to zero. The receiving entity shall ignore the value of a spare bit.

9.3.2.2  Message format  p. 98

9.3.2.2.1  EAP-Request/5G-Start message  p. 98
EAP-Request/5G-Start message is coded as specified in Figure 9.3.2.2.1-1 and Table 9.3.2.2.1-1.
Reproduction of 3GPP TS 24.502, Fig. 9.3.2.2.1-1: EAP-Request/5G-Start message
Figure 9.3.2.2.1-1: EAP-Request/5G-Start message
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Code field is set to 1 (decimal) as specified in Section 4.1 of RFC 3748 and indicates request.
Identifier field is set as specified in Section 4.1 of RFC 3748.
Length field is set as specified in Section 4.1 of RFC 3748 and indicates the length of the EAP-Request/5G-Start message in octets.
Type field is set to 254 (decimal) as specified in Section 5.7 of RFC 3748 and indicates the expanded type.
Vendor-Id field is set to the 3GPP Vendor-Id of 10415 (decimal) registered with IANA under the SMI Private Enterprise Code registry.
Vendor-Type field is set to EAP-5G method identifier of 3 (decimal) as specified in TS 33.402 Annex C.
Message-Id field is set to 5G-Start-Id of 1 (decimal).
Spare field consists of spare bits.
Extensions field is an optional field and consists of spare bits.
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9.3.2.2.2  EAP-Response/5G-NAS message  p. 99
EAP-Response/5G-NAS message is coded as specified in Figure 9.3.2.2.2-1 and Table 9.3.2.2.2-1.
Reproduction of 3GPP TS 24.502, Fig. 9.3.2.2.2-1: EAP-Response/5G-NAS message
Figure 9.3.2.2.2-1: EAP-Response/5G-NAS message
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Code field is set to 2 (decimal) as specified in Section 4.1 of RFC 3748 and indicates response.
Identifier field is set as specified in Section 4.1 of RFC 3748.
Length field is set as specified in Section 4.1 of RFC 3748 and indicates the length of the EAP-Response/5G-NAS message in octets.
Type field is set to 254 (decimal) as specified in Section 5.7 of RFC 3748 and indicates the expanded type.
Vendor-Id field is set to the 3GPP Vendor-Id of 10415 (decimal) registered with IANA under the SMI Private Enterprise Code registry.
Vendor-Type field is set to EAP-5G method identifier of 3 (decimal) as specified in TS 33.402 Annex C.
Message-Id field is set to 5G-NAS-Id of 2 (decimal).
Spare field consists of spare bits.
AN-parameters length indicates the length of the AN-parameters field in octets. If the AN-parameters length field is set to zero value, the AN-parameters field is absent. If the AN-parameters length field is set to a non-zero value, the AN-parameters field is present.
AN-parameters field is coded according to Figure 9.3.2.2.2-2 and Table 9.3.2.2.2-2.
NAS-PDU length field indicates the length of NAS-PDU field in octets. The NAS-PDU length field is set to a non-zero value.
NAS-PDU field contains a NAS message from the UE as specified in TS 24.501.
Extended-AN-parameters length field indicates the length of the extended-AN-parameters field in octets. The Extended-AN-parameters length field is present if the EAP-Response/5G-NAS message is at least (y+n+1) octets long.
Extended-AN-parameters field is coded according to Figure 9.3.2.2.2-4 and Table 9.3.2.2.2-4. If the Extended-AN-parameters length field is set to zero value, the Extended-AN-parameters field is absent. If the Extended-AN-parameters length field is set to a non-zero value, the Extended-AN-parameters field is present.
Extensions field is an optional field and consists of spare bits. The sending entity shall not include the Extensions field.
Reproduction of 3GPP TS 24.502, Fig. 9.3.2.2.2-2: AN-parameters field
Figure 9.3.2.2.2-2: AN-parameters field
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Each AN-parameter field is coded according to Figure 9.3.2.2.2-3 and Table 9.3.2.2.2-3.
Reproduction of 3GPP TS 24.502, Fig. 9.3.2.2.2-3: AN-parameter field
Figure 9.3.2.2.2-3: AN-parameter field
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The AN-parameter length field indicates the length of the AN-parameter value field. If the AN-parameter length field is set to zero value, the AN-parameter value field is absent. If the AN-parameter length field is set to non-zero value, the AN-parameter value field is present.
The AN-parameter type field indicates the type of the AN-parameter value field. Sending entity shall not set the AN-parameter type field to a spare value. Receiving entity shall ignore any AN-parameter field with the AN-parameter type field set to a spare value.
The following AN-parameter type field values are specified:
  • 01H (GUAMI);
  • 02H (selected PLMN ID);
  • 03H (requested NSSAI);
  • 04H (establishment cause for non-3GPP access);
  • 05H (selected NID);
  • 06H (UE identity);
  • 07H (onboarding indication);and
  • 08H (GUAMI type).
All other values of the AN-parameter type field are spare. Receiving entity shall ignore an AN-parameter field with the AN-parameter type field set to a spare value.
When the AN-parameter type field indicates the GUAMI, the AN-parameter value field is coded as value part (as specified in TS 24.007 for type 3 information element) of GUAMI information element as specified in clause 9.2.1.
When the AN-parameter type field indicates the selected PLMN ID, the AN-parameter value field is coded according to value part of PLMN ID information element as specified in clause 9.2.3.
When the AN-parameter type field indicates the requested NSSAI, the AN-parameter value field is coded according to value part of NSSAI information element as specified in clause 9.11.3.37 of TS 24.501.
When the AN-parameter type field indicates the establishment cause for non-3GPP access, the AN-parameter value field is coded as value part (as specified in TS 24.007 for type 3 information element) of the Establishment cause for non-3GPP access information element as specified in clause 9.2.2.
When the AN-parameter type field indicates the selected NID, the AN-parameter value field is coded according to the value part of the NID information element as specified in clause 9.2.7.
When the AN-parameter type field indicates the UE identity, the AN-parameter value field is coded according to the value part of the 5GS mobile identity information element for type of identity 5G-GUTI or for type of identity SUCI as specified in clause 9.11.3.4 of TS 24.501.
When the AN-parameter type field indicates the onboarding indication, the value of AN-parameter length is 0, i.e. the AN-parameter value field is not present.
When the AN-parameter type field indicates the GUAMI type, the value of AN-parameter length is set to 1 and the AN-parameter value field indicates whether the GUAMI is derived from native 5G-GUTI or 4G-GUTI as specified in clause 5.3.1.1 of TS 24.501. The following GUAMI type field values are specified:
  • 01H (GUAMI derived from native 5G-GUTI);
  • 02H (GUAMI derived from 4G-GUTI);
All other values of the GUAMI type field are spare. Receiving entity shall ignore a GUAMI type field set to a spare value.
Reproduction of 3GPP TS 24.502, Fig. 9.3.2.2.2-4: Extended-AN-parameters field
Figure 9.3.2.2.2-4: Extended-AN-parameters field
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Each extended-AN-parameter field is coded according to Figure 9.3.2.2.2-5 and Table 9.3.2.2.2-5.
Reproduction of 3GPP TS 24.502, Fig. 9.3.2.2.2-5: Extended-AN-parameter field
Figure 9.3.2.2.2-5: Extended-AN-parameter field
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The extended-AN-parameter length field indicates the length of the extended-AN-parameter value field. The extended-AN-parameter length field is set to a non-zero value.
The extended-AN-parameter type field indicates the type of the extended-AN-parameter value field. The following extended-AN-parameter type field values are specified:
  • 06H (UE identity).
All other values of the extended-AN-parameter type field are spare. Sending entity shall not set the extended-AN-parameter type field to a spare value. Receiving entity shall ignore any extended-AN-parameter field with the extended-AN-parameter type field set to a spare value.
When the extended-AN-parameter type field indicates the UE identity, the extended-AN-parameter value field is coded according to the value part of the 5GS mobile identity information element for type of identity SUCI as specified in clause 9.11.3.4 of TS 24.501.
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