9.1.12e DTM Assignment Command

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

This message is sent on the main DCCH or encapsulated in the PACKET CS COMMAND message on the PACCH (see 3GPP 44.060) by the network to the mobile station to change the channel configuration to a configuration with CS and packet connections when no timing adjustment is needed and reallocation of the CS timeslot is required. See table 9.1.12e.1.

Message type: DTM ASSIGNMENT COMMAND

Significance: dual

Direction: network to mobile station

Table 9.1.12e.1: DTM ASSIGNMENT COMMAND 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 Assignment Command Message Type	Message Type 10.4	M	V	1
	CS Power Command	Power Command 10.5.2.28	M	V	1
	Description of the CS Channel	Channel Description 10.5.2.5	M	V	3
	GPRS broadcast information	GPRS broadcast information 10.5.2.14d	M	LV	7 – n
10	Cell Channel Description	Cell Channel Description 10.5.2.1b	O	TV	17
11	Channel mode	Channel mode 10.5.2.6	O	TV	2
12	Frequency List	Frequency List 10.5.2.13	C	TLV	4 – 132
13	Mobile Allocation	Mobile Allocation 10.5.2.21	C	TLV	3 – 10
15	Description of the Uplink Packet Channel Assignment	RR Packet Uplink Assignment 10.5.2.25c	O	TLV	3 – n
16	Description of the Downlink Packet Channel Assignment	RR Packet Downlink Assignment 10.5.2.25d	O	TLV	3 – n
17	Multi-Rate configuration	MultiRate configuration 10.5.2.21aa	O	TLV	4-8
9-	Ciphering Mode Setting	Ciphering Mode Setting 10.5.2.9	O	TV	1
18	Mobile Allocation C2	Mobile Allocation 10.5.2.21	C	TLV	3 – 10
19	Frequency List C2	Frequency List 10.5.2.13	C	TLV	4 – 132
20	Description of the Downlink Packet Channel Assignment Type 2	RR Packet Downlink Assignment Type 2 10.5.2.25e	C	TLV	3 n
21	Channel Description C2	Channel Description 3 10.5.2.5c	O	TV	3
6D	Extended TSC Set	Extended TSC Set 10.5.2.82	C	TV	2

9.1.12e.1 (void)

9.1.12e.2 RR Packet Uplink Assignment and RR Packet Downlink Assignment IEs

These information elements are optional, but at least one of them shall be present. With the enhanced DTM CS establishment procedure the network may omit both packet assignment information elements, see 3GPP TS 44.060.

9.1.12e.3 MultiRate configuration

This information element appears if the Channel mode IE indicates a multi-rate speech codec, and if the assigned configuration is new, i.e. is different from the configuration of a previously allocated channel in the cell. If the Channel mode IE indicates a multi-rate speech codec, and the MultiRateconfiguration IE is not included, then the mobile station shall assume that the old multi-rate configuration is still valid, if existing.

9.1.12e.4 Ciphering Mode Setting

If this information element is omitted, the mode of ciphering is not changed after the mobile station has switched to the assigned channels. This information element shall not be included if support for this IE has not been indicated by the mobile station in the Mobile Station Classmark 3 IE (see 3GPP TS 24.008).

9.1.12e.5 (void)

9.1.12e.6 Mobile Allocation and Frequency List

If the Description of the CS Channel IE indicates frequency hopping, one and only one of the following information elements shall be present:

– Mobile Allocation IE

– Frequency List IE

If the Description of the CS Channel IE does not indicate frequency hopping, then any of the Mobile Allocation or Frequency List IEs if present shall be considered as an unnecessary IE in the message.

9.1.12e.7 Mobile Allocation C2, Frequency List C2, Channel Description C2 and Description of the Downlink Packet Channel Assignment Type 2

These information elements may be included to assign packet resources in Dual Transfer Mode on a second radio frequency channel (which does not include the dedicated resource) to a mobile station supporting Downlink Dual Carrier (see 3GPP TS 44.060).

If the Channel Description C2 IE is present, the Description of the Downlink Packet Channel Assignment Type 2 IE shall be present and provides the description of the downlink packet resources for both carriers C1 and C2. In this case, the Description of the Downlink Packet Channel Assignment IE shall not be included.

If the Channel Description C2 IE is present and indicates frequency hopping, one and only one of the following information elements shall be present:

– Mobile Allocation C2 IE

– Frequency List C2 IE

If the Channel Description C2 IE is not included then the Description of the Downlink Packet Channel Assignment Type 2 IE if present shall be considered as an unnecessary IE in the message.

If the Channel Description C2 IE is not included or is included but does not indicate frequency hopping, then any of the Mobile Allocation C2 or Frequency List C2 IEs if present shall be considered as an unnecessary IE in the message.

9.1.12e.8 Extended TSC Set

If the message is sent to a mobile station that indicates support for extended TSC sets (see 3GPP TS 24.008 [79]) this information element may be included to provide TSC related information for the assigned radio resources. In the absence of this information element the TSC related information provided by the Channel Description IE and Channel Description 3 IE shall apply.