6.6 In-band parameters
3GPP43.055Dual Transfer Mode (DTM)Release 17Stage 2TS
When the mobile station is in dedicated mode, packet transfer mode or both, some information may need to be passed to the mobile station so that it can enter or maintain the dual transfer mode. Most of that information consists of parameters that are broadcast in the (P)BCCH, but that cannot be read by the mobile station. Some new parameters are added.
Table 4 lists those parameters and indicates whether they have to be sent while in dedicated mode, packet transfer mode or both. When the mobile station is in idle mode, the parameters are sent on the BCCH. When the mobile station is in dedicated mode, the parameters are sent on the SACCH. When the mobile station is in packet transfer mode, they are sent on the PACCH.
While in dual transfer mode, the MS shall assume that the SGSN Release is "Release ’99 onwards" and shall ignore the SGSNR information provided in PSI 14.
Table 4: List of parameters to be passed in-band to the mobile station
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(P)BCCH |
FACCH |
SACCH |
PACCH |
Parameter |
Description |
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DTM: bit(1) |
DTM support in the cell. (P)BCCH: to enable a quick resumption of the GPRS session in the transition from dual transfer mode to packet transfer mode; t enable the LA and RA Update procedures to be performed in parallel on an SDCCH. FACCH: immediately after a handover procedure when the MS was in DTM, in order to enable the packet session to be resume without long interruptions. [DTM Information] SACCH: to enable the packet request procedures while in dedicated mode. [SI 6] |
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RAI : bit(48) |
Routeing Area Identity. It is needed to enable the MS to detect changes of routeing area during a handover in dedicated mode [DTM Information, SI6] |
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Cell Identity : bit(16) |
Cell Identity. It is needed to enable the MS to detect changes of cell after a handover in dedicated mode [DTM Information, SI 6] |
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MAX_LAPDm : bit(3) |
Maximum number of LAPDm frames. To limit the use of the main DCCH when the MS in dedicated mode FACCH: immediately after a handover procedure when the MS was in DTM, in order to enable the packet session to be resume without long interruptions. [DTM Information] SACCH: to enable the packet request procedures while in dedicated mode. [SI 6] |
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GPRS Cell Options |
GPRS Cell Options. Sent on the DTM assignment message (DTM ASSIGNMENT COMMAND or PACKET ASSIGNMENT) |
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GPRS Power Control Parameters |
GPRS Power Control Parameters. Sent on the DTM assignment message (DTM ASSIGNMENT COMMAND or PACKET ASSIGNMENT) |
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(P)SI 13 Information |
(P)SI 13 Information: this information is sent so that the mobile station needs not read SI 13 at call release during dual transfer mode |
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Dedicated Mode MBMS Notification Support Indication |
Dedicated Mode MBMS Notification Support Indication. to enable the mobile station to participate in MBMS procedures while in dedicated mode (DTM ASSIGNMENT COMMAND, PACKET ASSIGNMENT or DTM INFORMATION, SI 6) |
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