Direct Transfer (DT) in 3G PS

selim.hasan
selim.hasan  Diamond  (1)
5 years 10 months ago  View: 1225  Reply: 5

CN Originated Direct Transfer:
The purpose of the Direct Transfer procedure is to carry UE – CN signalling messages over the Iu Interface. The UE ? CN signalling messages are not interpreted by the UTRAN. The UE – CN signalling messages are
transported as a parameter in the DIRECT TRANSFER messages. The procedure uses connection oriented signalling.
If a UE - CN signalling message has to be sent from the CN to the UE, the CN shall send a DIRECT TRANSFER message to the RNC including the UE - CN signalling message as a NAS-PDU IE.

If the DIRECT TRANSFER message is sent in the downlink direction, it shall include the SAPI IE and shall not include the LAI + RAC IE and the SAI IE. The use of the SAPI IE included in the DIRECT TRANSFER message enables the UTRAN to provide specific service for the transport of the included NAS
message.

UTRAN Originated Direct Transfer:

If a UE - CN signalling message has to be sent from the RNC to the CN without interpretation, the RNC shall send a DIRECT TRANSFER message to the CN including the UE - CN signalling message as a NAS-PDU IE.

If the DIRECT TRANSFER message shall be sent to the PS domain, the RNC shall also add the LAI and the RAC IEs, which were the last LAI + RAC indicated to the UE by the UTRAN via the current RRC connection, or if the UTRAN had not yet indicated any LAI + RAC to the UE via the current RRC connection, then the LAI + RAC of the cell via which the current RRC connection was established. If the DIRECT TRANSFER message is sent to the PS domain, the RNC shall also add a Service Area corresponding to at least one of the cells from which the UE is consuming radio resources. If the DIRECT TRANSFER message is sent in uplink direction, the RNC shall not include the SAPI IE.








ahleemon
ahleemon  Platinum 
5 years 10 months ago
very useful information. thanks!
Armetta
Armetta  Diamond 
5 years 10 months ago
This document is very well done

shain
shain  Gold 
5 years 10 months ago
well described document. I would like to have it.
ahleemon
ahleemon  Platinum 
5 years 10 months ago

hi selim,

what is NAS-PDU IE?

user_2837311
user_2837311  Diamond 
1 year 10 months ago
useful document, thanks