Content for  TS 24.501  Word version:  19.0.0

The purpose of the SSC mode information element is to indicate SSC mode. The SSC mode information element is coded as shown in Figure 9.11.4.16.1 and Table 9.11.4.16.1. The SSC mode is a type 1 information element.

The purpose of the Re-attempt indicator information element is to indicate a condition under which the UE is allowed in the current PLMN or its equivalent PLMN(s) or the current SNPN or its equivalent SNPNs for the same DNN, to re-attempt a session management procedure (see TS 24.301) corresponding to the 5GS session management procedure which was rejected by the network. The Re-attempt indicator information element is coded as shown in Figure 9.11.4.17.1 and Table 9.11.4.17.1. The Re-attempt indicator is a type 4 information element with a length of 3 octets.

The purpose of the 5GSM network feature support information element is to indicate whether certain session management related features are supported by the network. The 5GSM network feature support information element is coded as shown in Figure 9.11.4.18.1 and Table 9.11.4.18.1. The 5GSM network feature support is a type 4 information element with a minimum length of 3 octets and a maximum length of 15 octets.

See subclause 9.9.4.28 in TS 24.301.

The purpose of the 5GSM congestion re-attempt indicator information element is to indicate whether the back-off timer is applied in the registered PLMN or all PLMNs or in the registered SNPN or all equivalent SNPNs, and additionally to indicate whether the back-off timer is applied in the current access type or both 3GPP access type and non-3GPP access type. The 5GSM congestion re-attempt indicator information element is coded as shown in Figure 9.11.4.21.1 and Table 9.11.4.21.1. The 5GSM congestion re-attempt indicator is a type 4 information element with a length of 3 octets.

The purpose of the ATSSS container information element is to transfer parameters associated with ATSSS. The ATSSS container information element is coded as shown in Figure 9.11.4.22.1 and Table 9.11.4.22.1. The ATSSS container is a type 6 information element with a minimum length of 3 octets and a maximum length of 65538 octets.

The purpose of the control plane only indication information element is to indicate that a PDU session is only for control plane CIoT 5GS optimization. The control plane only indication information element is coded as shown in Figure 9.11.4.23.1. The control plane only indication is a type 1 information element.

The purpose of the IP header compression configuration information element is to negotiate ROHC channel setup parameters specified in RFC 5795 and, optionally, provide additional header compression context setup parameters. The IP header compression configuration information element is coded as shown in Figure 9.11.4.24.1 and Table 9.11.4.24.1. The IP header compression configuration is a type 4 information element with a minimum length of 5 octets and a maximum length of 257 octets. The optional Additional IP header compression parameters container field conveys the additional header compression context setup parameters as specified in TS 23.501 in a generic container. This field corresponds to the profile-specific information in the header of the ROHC IR packet type in RFC 5795.

The purpose of the DS-TT Ethernet port MAC address information element is to signal the MAC address of the DS-TT Ethernet port used for a PDU session of "Ethernet" PDU session type. The DS-TT Ethernet port MAC address information element is coded as shown in Figure 9.11.4.25.1 and Table 9.11.4.25.1. The DS-TT Ethernet port MAC address is a type 4 information element with a length of 8 octets.

The purpose of the UE-DS-TT residence time information element is to signal the time taken within the UE and the DS-TT to forward a packet i.e. between the ingress of the UE and the DS-TT port in the DL direction, or between the DS-TT port and the egress of the UE in the UL direction. The UE- DS-TT residence time information element is coded as shown in Figure 9.11.4.26.1 and Table 9.11.4.26.1. The UE-DS-TT residence time is a type 4 information element with a length of 10 octets.

The purpose of the Port management information container information element is to transport a port management service message as specified in clause 8 of TS 24.539. The Port management information container information element is coded as shown in Figure 9.11.4.27.1 and Table 9.11.4.27.1. The Port management information container is a type 6 information element with a minimum length of 4 octets and a maximum length of 65538 octets.

The purpose of the Ethernet header compression configuration information element is to negotiate the use of EHC and the length of the CID field in the EHC packet (see TS 38.323). The Ethernet header compression configuration information element is coded as shown in Figure 9.11.4.28.1 and Table 9.11.4.28.1. The Ethernet header compression configuration is a type 4 information element with the length of 3 octets.

The purpose of the Remote UE context list information element is to provide identity and optionally IP address of a 5G ProSe remote UE connected to, or disconnected from, a UE acting as a 5G ProSe layer-3 UE-to-network relay. The Remote UE context list information element is coded as shown in Figure 9.11.4.29.1, Figure 9.11.4.29.2, Table 9.11.4.29.1 and Table 9.11.4.29.2. The Remote UE context list is a type 6 information element with a minimum length of 16 octets and a maximum length of 65538 octets.