Hi.
Imagine following configuration: - GSM network advertises GPRS capabilities in System Information messages - It's not actually available (SGSN crashed, all the timeslots are occupied by TCH etc)
What would be expected behavior for MS in this scenario?
Shall it switch to alternative network in hope of getting promised GPRS? Shall it hang on the currently camped network providing voice/sms only? Which spec(s) cover that? What could be decision factors for the MS? SIM entries, some data in SI, some timeout somewhere, smth else?
Hi Max,
On Thu, May 26, 2016 at 11:31:23AM +0200, Max wrote:
What would be expected behavior for MS in this scenario?
I'm not entirely sure what the expected behavior is.
Shall it switch to alternative network in hope of getting promised GPRS?
If it is a PS-only device, this might make sense. Not sure if it is mandated anywhere.
The problem is if it is a CS + PS device, and if CS registration worked on the cell, but PS doesn't. In that case I've not seen any phone ever considering to select a different cell, let aside a different network.
Shall it hang on the currently camped network providing voice/sms only? Which spec(s) cover that? What could be decision factors for the MS? SIM entries, some data in SI, some timeout somewhere, smth else?
Cell (re)selection is traditionally specified in 03.22. Not sure where it got moved later (when transitioning to post-rel99). Not sure why 23.022 was withdrawn, but there is now 23.122 which has superseeded it. http://www.etsi.org/deliver/etsi_ts/123100_123199/123122/13.04.00_60/ts_1231... is the link to the latest release. But it's quite complex with 2G/3G/4G and all the optional features like ProSe, CSG, ...
There's also the 2G-only successor of 03.22: 43.022 at http://www.etsi.org/deliver/etsi_ts/143000_143099/143022/13.00.00_60/ts_1430...
osmocom-net-gprs@lists.osmocom.org
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Harald Welte -
Max