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• Akhtar Khan

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Case Name：

IRAT HHO Not Happen Caused by Siemens IRAT HHO Lisence

Description：

In I Country, B 3G project, we found that the IRAT HHO from HUAWEI 3G to Moto 2G not happen. And Moto 2G connect to Siemens Core. There are 3 RNCs’ coverage is same as Moto.

Alarm：

NULL

Reason

1. From the KPI daily report, these 3 RNC CS and PS do not have IRAT

Analyze：

HHO, the attempt is there, it is means that the IRAT neighbor and RNC switch are all been defined right.

2. We check the RNC CFG, the regarding IRAT switch is open. SET HOCOMM: COEXISTMEASTHDCHOICE=COEXIST_MEAS_THD_CHOICE_INTERFREQ SET INTERFREQHOCOV: INTERFREQREPORTMODE=PERIODICAL_REPORTING, INTERFREQFILTERCOEF=D3,

PRDREPORTINTERVAL=D500,

HYSTFOR2D=4,

HYSTFORPRDINTERFREQ=0,

HYSTFOR2F=4,

WEIGHTFORUSEDFREQ=0, TIMETOTRIG2F=D1280,

TIMETOTRIG2D=D320, TIMETOTRIGFORPRDINTERFREQ=0,

INTERFREQCSTHD2DECN0=-14,

INTERFREQCSTHD2FECN0=-12,

INTERFREQR99PSTHD2DECN0=-14,

INTERFREQHTHD2DECN0=-14,

INTERFREQR99PSTHD2FECN0=-12,

INTERFREQHTHD2FECN0=-12,

INTERFREQCSTHD2DRSCP=-95,

INTERFREQCSTHD2FRSCP=-92,

INTERFREQR99PSTHD2DRSCP=-95,

INTERFREQHTHD2DRSCP=-95,

INTERFREQR99PSTHD2FRSCP=-92,

INTERFREQHTHD2FRSCP=-92,

TARGETFREQCSTHDECN0=-12,

TARGETFREQR99PSTHDECN0=-12,

TARGETFREQHTHDECN0=-12,

TARGETFREQCSTHDRSCP=-92,

TARGETFREQR99PSTHDRSCP=-92, USEDFREQCSTHDECN0=-12,

TARGETFREQHTHDRSCP=-92, USEDFREQR99PSTHDECN0=-12,

USEDFREQHTHDECN0=-12, USEDFREQR99PSTHDRSCP=-92,

USEDFREQCSTHDRSCP=-92, USEDFREQHTHDRSCP=-92,

INTERFREQMEASTIME=60; SET CORRMALGOSWITCH: 2019-7-10

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HOSWITCH=SOFT_HANDOVER_SWITCH1&INTRA_FREQUENCY_HARD_HANDOVER_SWITCH1&ACT_SET_QUAL_SWITCH-1&SIGNAL_HO_SWITCH0&INTER_FREQ_HHO_SWITCH-0&INTER_RAT_CS_OUT_SWITCH1&INTER_RAT_PS_OUT_SWITCH-1 3. We can check from the above information, the parameter for HUAWEI 3G RNC is correct, so we doubt there is some issue happen in Moto BSC, so we check the Moto BSC parameter as below.

From the above information, we can know that the Moto BSC already open the regarding IRAT HHO switch. 4. After check HUAWEI RNC and Moto BSC, we found that all the IRAT HHO switch is open, and the IRAT neighbor is also been defined well. And from RNC and HUAWEI Core sides, we did the signaling trace. Find out that before the IRAT HHO, HUAWEI Core need prepare the IRAT HHO, at this time the IRAT HHO fail, so the IRAT attempt counter is 0. The reject reason is no-resource-available. Now we know, this issue must caused by the Siemes Core.

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5. After we check Siemens Core, we found that the External 3G to 2G lisence is empty. Customer did not buy the lisence from Siemens, so that the Siemens reject the IRAT HHO. 6. So the issue is been located, after discuss with HUAWEI core, we can convert the 3G signaling to 2G signaling, so Siemens can read the message and the IRAT HHO can happen. The parameter which are setted in HUAWEI core is as below: Handover Parameters for Siemens Adjecent LAC

Parameter Value Siemens Adjacent

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Global cell ID

LAC

LA cell name

TEST_SIEMENS_HO

MSC number of the LA cell

MSC ID

VLR number of the LA cell

VLR Number

Mobile network code

FFF

Perform roaming analysis

NO

Restrict incoming call

NO

Restrict outgoing call

NO

Location area category

LAI

Location area type

Adjacent VLR

Multi-area name

NULL

IDP Location Number Address Attribute

International Number

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Non Broadcast LAI Flag

NO

Domain name

PUBLIC

Server name

LOCAL

Cipher Mode Setting

NO

Encryption Algorithm

Classmark2 RFC

111.00

Cell Type

CGI

Containing Classmark3 IE

YES

Containing Chosen Encry Algorithm IE

NO

Containing Imsi IE

NO

Half Rate Channel Permitting Flag

FORBID

Containing DTX IE

NO

Containing Integrity Protection IE

YES

Containing OBssToNBss IE

YES

Containing SRncToTRnc IE

YES

Containing Bssmap Service HandOver IE

YES

Only Contain FR Speech Version 1 Flag

NO

Contain Current Speech Version Flag

YES

Support whole net configuration or not when SNA

NO

Not Send Classmark Request

NO

Inter MSC Handover/Relocation MAP Not Carry Codeclist

NO

Not containing Alternative RAB Configuration

NO

Inter MSC Handover Not Support Active Trace

NO

Reserved Bit 24

1.00

Inter MSC Handover Not Support HSCSD

NO

Reserved Bit 26-Reserved Bit 31

111111

Hot LAI

NO

Reserved Bit 1-Reserved Bit 31

0

A. SAI is contained: The option is valid only when Handover Type is set to GSM to UMTS handover. If the option is selected, the format of origination side cell handover in the Handover Request

message is SAI; otherwise, the

format is GCI. The value is SAI by default. – parameter was set to GCI B. Chosen encryption algorithm is contained: If the option is selected, the Chosen Encryption Algorithm IE is contained in the Handover Request message; otherwise, the Chosen Encryption Algorithm IE is not contained in the Handover Request message. Parameter set to no

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C. Cipher mode setting – Parameter set to no 7. After change the parameter, the IRAT HHO happen in our test and also can be found in our daily report:

Suggestion：

IRAT HHO related to many part of network, so after we check from RF side and HUAWEI core side, it is necessary to check other vendor’s equipment. So that we need cooperate with customer and other depatment closely.

attachment： Bellary_RNC_303_IOS_2010-05-06-15-32-19.rar

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