Question 2G to 3G Reselection Delay

6/9/2014

Question 2G to 3G reselection delay [Archive] - Wire Free Alliance

Wire Free Alliance > Discussions for Wireless Network > Live Optimization > Question 2G to 3G reselection delay PDA

View Full Version : Question 2G to 3G reselection delay

YateBTS Open source GSM yatebts.com

repeater kingtone.cc

YateBTS is a 2.5G base station fork of OpenBTS by David BurgessGSM WCDMA CDMA TETRA LTE repeater Wellcome to OEM/ODM ! mirc84

2013-11-21, 03:47 AM

Hello everyone, I'm having some problems with reselection from 2g to 3g using Huawei Equip. I have attached one excel with si2quater from 3 operators. for OP1 and OP2 the reselection takes very short while for OP3 takes very long. C ould you please give me an ideea? For all teste I have used the same phone, Nokia C 5. Thank you for your time!

tabordas

2013-11-21, 09:16 AM

Are the 3 operators using Huawei RAN? Is it 2G Huawei or 3G Huawei? There are many variables such as: . Number of defined 2G->3G neighbor relations. Depending on the IE included on the SI2Quater, you may need more than 1 SI2Quater to send all the neighbor list to the Ue. . Number of 3G UARFC N. . Feature activation: Huawei GBSS has a feature called Fast UMTS to GSM C ell Reselection at C S call release which automatically "forces" the reselection to 3G on call release. You may want to explore that. It works better on GBSS14. I know that other 2G vendors have similar features. . Another possibility is to activate Blind Search where Ue reselects from 2G into 3G UARFC N. This minimizes the information sent to the Ue and therefore accelerates the reselection. Hope it helps.

mirc84

2013-11-26, 02:20 AM

Hey, thanks a lot! I might found the issue. Please see below, maybe it will help someone as I noticed there are a lot of irat reselection questions. :) Only OP3 is Huawei. The rest are other vendors. . Number of defined 2G->3G neighbor relations. Depending on the IE included on the SI2Quater, you may need more than 1 SI2Quater to send all the neighbor list to the Ue. At a closer look I noticed that the message which contains the 3g PSC (on which the cell had to go) was sent by the network very late. The reasons, at least from my point of view was: - HW seems to send a 2qter message containing reselection information but no PSC (behavior different from other operators, see in the attachment). Is this ok from 3GPP point of view? - there are 20 nbrs defined so they are split into more 2qter messages. Regarding optimisation of 2qter message I found two parameters in GBSS14: - SI 2quater IE Downsizing Switch (LST GC ELLC C UTRANSYS). - SI 2quater Optimization Switch (LST GC ELLC C UTRANSYS) . Number of 3G UARFC N. :) see above. :) . Feature activation: Huawei GBSS has a feature called Fast UMTS to GSM C ell Reselection at C S call release which automatically "forces" the reselection to 3G on call release. You may want to explore that. It works better on GBSS14. I know that other 2G vendors have similar features. Do you have any ideea if this feature is mobile dependent? For example, huawei doc states that the UE should be 3GPP REL6. . Another possibility is to activate Blind Search where Ue reselects from 2G into 3G UARFC N. This minimizes the information sent to the Ue and therefore accelerates the reselection.

tabordas

2013-11-26, 08:08 AM

I'll have a look at your first points later when I have a little more time. Regarding the feature, yes it only works for R6 and above UE. The rest will do a normal reselection. But for the UE that support the feature the reselection time drops to 2 or 3 seconds...

ninjafine

2013-12-01, 01:35 AM

Hi mirc84! Additional things to check. 1. For OP1 and OP2 we can see SI2Quater_C ount=1 and SI2Quater_C ount=0 and for OP3 SI2Quater_C ount=2. This may add up to 2 sec. to wait additional System Information Type 2quater message. 2. C heck also System Information Type 3 (SI2quater_POSITION) to chek if OPs are equal in terms of using BC C H ext. 3. Number of FDD_ARFC N in System Information Type 2quater also increases measurements.

gogotchiya83

2014-04-18, 02:51 AM

Any update of this issue ? In our case we have delay in both side, Reselection from 2G->3G & from 3G ->3G Any help PLZ ?

M2M and 2G Networks racowireless.com The 2G sunset is coming Find out how it will affect M2M vBulletin® v4.1.12, C opyright ©2000-2014, Jelsoft Enterprises Ltd.

http://www.finetopix.com/archive/index.php/t-37352.html

1/2

6/9/2014

http://www.finetopix.com/archive/index.php/t-37352.html

Question 2G to 3G reselection delay [Archive] - Wire Free Alliance

2/2