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Reply To: GPRS Gs interface & paging

#54855
pix
Guest

sanyam,

the activation of the Gs interface also means that there are combined LA/RA updates.

3GPP 23.060
“Co-ordination of LA update and RA update, including periodic updates, thus saving radio resources. A combined RA / LA update is sent from the MS to the SGSN. The SGSN forwards the LA update to the VLR.”

“When the MS enters a new RA in network operation mode I, the MS sends a Routeing Area Update Request message to the SGSN, as described in clause “Combined RA / LA Update Procedure”. The LA update is included in the RA update.”

“A routeing area update takes place when a GPRS-attached MS detects that it has entered a new RA, when the periodic RA update timer has expired, or when the MS has to indicate new access capabilities to the network”

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Therefore,
check your RA Code and RA Colour design (I recommend 1 RA code and 1 RA colour per LAC)
(example of such settings : all cells in your network are set with RA code = 1 and RA colour = 1. It is strange, but actually each routing area is different from LAC to LAC, because the RA id is defined by the association LAC + RAC, which is here unique.)

cheers
pix