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View Full Version : Request - RAT locking function affect to IRAT HO?



cdmahn
2010-12-04, 01:48 PM
We have use TEMS to WCDMA drive test. The measurement setup is for long calls (900s). We use RAT locking function in TEMS Investigation to choose the WCDMA for test phone. There are a number of dropped calls. We also checked the phone scanner and most of dropped calls are at low RSCP.

In TEMS Inv user manuals, we note that RAT locking function is taking effect in Idle Mode. The question here is if the locking function prevents the phone making IRAT handover to GSM.

Thank you in advance,

Rooster[BG]
2010-12-04, 08:15 PM
Hi,

I've used this option and there were no IRAT HO no metter the signal level. The phone goes to Limitied Service Mode when you lose coverage and after you are in coverage again you have LAU, registration and so on.

I think that TEMS ment that the phone must be in idle mode to lock it.

BR

cdmahn
2010-12-04, 09:40 PM
I think that TEMS ment that the phone must be in idle mode to lock it.

Are there more information about RAT locking functions?

Rooster[BG]
2010-12-04, 11:58 PM
Unfortunately I couldn't find anything moe in TEMS Documentation. This is the only part that has some info.

On the assumption that both types of network (GSM and WCDMA) are
available to the phone, this has the following implications:
• If the RAT lock is set to “WCDMA”, the phone will be locked to WCDMA
indefinitely; specifying GSM bands or channels to lock on will not by itself
force the phone into GSM mode.
• Analogously, if the RAT lock is set to “GSM”, the phone will be locked to
GSM indefinitely; specifying WCDMA UARFCNs or cells to lock on will
not by itself force the phone into WCDMA mode.
• In order to force immediate use of GSM, you must set the RAT lock to
“GSM”; the phone will then be locked to a GSM network indefinitely, and
any GSM-specific settings you have made will take effect. The same
holds for WCDMA.

Note again that the RAT lock function has an effect in idle mode only.

It is very strange explanation, since my tests were with very bad RSCP and Ec/No the phone didn't make any IRAT HOs.


Are there more information about RAT locking functions?