11.2.46 DTM Handover Command

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

This message is sent on the PACCH by the network to the mobile station in dual transfer mode to command the mobile station to leave the current cell and change to a new cell. This message may be sent using Extended RLC/MAC control segmentation (see sub-clause 9.1.12a). The combined length of the IEs included in the DTM HANDOVER COMMAND message shall not exceed 175 octets.

If the network allocates PS resources on a single carrier where those resources are not required to support any of the features EGPRS2, Fast Ack/Nack Reporting or RTTI configurations, then the network shall include the DTM Handover PS Radio Resources IE in the DTM HANDOVER COMMAND message. Otherwise, the network shall include the DTM Handover PS Radio Resources 2 IE or DTM Handover PS Radio Resources 3 IE in the DTM HANDOVER COMMAND message.

Message type: DTM HANDOVER COMMAND

Direction: network to mobile station

Classification: non-distribution message

Table 11.2.46.1: DTM HANDOVER COMMAND information elements

< DTM Handover Command message content > ::=

< PAGE_MODE : bit (2) >

{ 0 < Global TFI : < Global TFI IE > >

{ — Non-distribution part

{ 00 < DTM Handover to A/Gb Mode Payload :

< DTM Handover to A/Gb mode Payload description struct > >

| 01 < DTM Handover to UTRAN Payload : < RRC Container IE > >

! < Message escape : { 10 | 11} bit (*) = < no string > > } — Extended for future changes

< padding bits >

! < Non-distribution part error : bit (*) = < no string > > }

! < Address information part error : bit (*) = < no string > > }

! < Non-distribution part error : bit (*) = < no string > > ;

< DTM Handover to A/Gb mode Payload description struct > ::=

< DTM Handover CS RR Info: < DTM Handover CS Radio Resources IE > >

{ 00 < DTM Handover PS RR Info: < DTM Handover PS Radio Resources IE > >

| 01 < DTM Handover PS RR 2 Info : < DTM Handover PS Radio Resources 2 IE > >

| 10 < DTM Handover PS RR 3 Info : < DTM Handover PS Radio Resources 3 IE > >

! < Message escape : { 11 } bit (*) = <no string > > } — reserved for future use

{ 0 | 1 < NAS Container for PS Handover IE > };

Table 11.2.46.2: DTM HANDOVER COMMAND information element details

PAGE_MODE (2 bit field)
This field is defined in sub-clause 12.20.

Global TFI
This information element contains the TFI of the mobile station’s downlink TBF or uplink TBF. This field is defined in sub-clause 12.10.

DTM Handover CS Radio Resources
This information element contains the CS information needed by the mobile station when performing DTM Handover to A/Gb mode and is defined in sub-clause 12.47. If a mobile station supports extended TSC sets (see 3GPP TS 45.002 [32]) then TSC related information applicable to the PS domain identified by the DTM Handover PS RR Info IE, the DTM Handover PS RR 2 Info IE or the DTM Handover PS RR 3 Info IE shall take precedence over TSC related information applicable to the PS domain provided by this IE.

DTM Handover PS RR Info
This information element contains the PS information needed by the mobile station when performing DTM Handover to A/Gb mode and is defined in sub-clause 12.46. If a mobile station supports extended TSC sets (see 3GPP TS 45.002 [32]) then this IE can be used to identify TSC related information applicable to the PS domain.

DTM Handover PS RR 2 Info
This information element contains the PS information needed by the mobile station when performing DTM Handover to A/Gb mode when downlink PS resources are assigned on two carriers or requires the support of EGPRS2, Fast Ack/Nack Reporting or RTTI configurations, and is defined in sub-clause 12.48. If a mobile station supports extended TSC sets (see 3GPP TS 45.002 [32]) then this IE can be used to identify TSC related information applicable to the PS domain.

DTM Handover PS RR 3 Info
This information element contains the PS information needed by the mobile station and can only be used when EMSR or extended TSC sets (see 3GPP TS 45.002 [32]) is supported by the mobile station. This information element is defined in sub-clause 12.64. If a mobile station supports extended TSC sets (see 3GPP TS 45.002 [32]) then this IE can be used to identify TSC related information applicable to the PS domain.

NAS Container for PS Handover
This information element contains the NAS information needed by the mobile station when performing DTM Handover to A/Gb mode and is defined in sub-clause 12.43.

DTM Handover to UTRAN Payload
This information element contains a HANDOVER TO UTRAN COMMAND message (as defined in 3GPP TS 25.331) containing the information needed by the mobile station when performing DTM Handover to UTRAN. This information element is defined in sub-clause 12.45b.