9.1.12i DTM Request

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

This message is sent on the main DCCH by the mobile station to request the establishment of dual transfer mode. See table 9.1.12i.1.

Message type: DTM Request

Significance: dual

Direction: mobile station to network

Table 9.1.12i.1: DTM Request message content

IEI	Information element	Type / Reference	Presence	Format	length
	RR management Protocol Discriminator	Protocol Discriminator 10.2	M	V	1/2
	Skip Indicator	Skip Indicator 10.3.1	M	V	1/2
	DTM Request Message Type	Message Type 10.4	M	V	1
	TLLI	TLLI 10.5.2.41a	M	V	4
	Channel Request Description 2	Channel Request Description 2 10.5.2.8b	M	LV	5 – n

NOTE: the MS capabilities relevant to DTM are either provided to the network in the Mobile Station Classmark 3 IE (see 3GPP TS 24.008 [79]) or contained in the Channel Request Description 2 IE in the present message.