8.125 CIoT Optimizations Support Indication

29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS

CIoT Optimizations Support Indication is coded as depicted in Figure 8.125-1 below.

		Bits
	Octets	8	7	6	5	4	3		2	1
	1	Type = 194 (decimal)
	2 to 3	Length = n
	4	Spare				Instance
	5	Spare	Spare	Spare	Spare	IHCSI	AWOPDN	SCNIPDN		SGNIPDN
	6 to (n+4)	These octet(s) is/are present only if explicitly specified

Figure 8.125-1: CIoT Optimizations Support Indication

Octet 5 carries the feature support bits for each of the CIoT optimization as follows:

– Bit 8 to Bit 5: Spare, for future use and set to 0.

– Bit 4 – IHCSI (IP Header Compression Support Indication): Indicates the support of IP header compression based on ROHC framework (see IETF RFC 4995 [77]) for Control Plane CIoT EPS optimisations, when set to ‘1’.

– Bit 3 – AWOPDN (Attach without PDN Support Indication): Indicates the support of Attach without PDN connection as specified in clause 4.3.5.10 of 3GPP TS 23.401 [3], when set to ‘1’. Here the word "PDN connection" implies both the PDN connection through SGW and PGW and the PDN connection through SCEF.

– Bit 2 – SCNIPDN (SCEF Non IP PDN Support Indication): Indicates the support of SCEF Non IP PDN Connection as specified in clause 5.13.1 of 3GPP TS 23.682 [74], when set to ‘1’.

– Bit 1 – SGNIPDN (SGi Non IP PDN Support Indication): Indicates the support of SGi Non IP PDN Connection as specified in clause 4.3.17.8.3.3 of 3GPP TS 23.401 [3] and 3GPP TS 23.060 [35], when set to ‘1’.