1 Detection and Troubleshooting of GSM RF Tunnel Faults Principle + Tools + Cases + Deliverables 20121031

 

Security Level:

09/12/16

Detection and Troubleshooting of !" R# Tunnel #aults: #ault s: Principle $ Tools $ %ases $ Deliverables Prepared by: Zhang Xianghua, Hanwei Reviewed by: Qi Haofeng www.huawei.com

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" 、 How to u(e )!!! Antenna *ault Detection *unction i( added.  、 Add ca(e( o+ outut owe' i( mi(match a+te' (wa (ite(. $ 、 Add ca(e( o+ how to u(e owe' mete' mete'.. - 、 De(c'ition aout Wi'ele(( Ai' Inte'+ace and /* )aintenance 0 Te(tin1 +unction i( added . 2 、 Add ca(e( o+ how to 'e(ol&e 3SW/ and Inte'modulation in the indoo' co&e'a1e (4(tem.

Wan1 Chun,Chen Wei,Liu 5iu4u,%ian1  6in1,6an  6in1,6 an 6a+en1 6a+en1 ,Lian1 7ian, 8hao  7in17in1,9i Hao+en1,Gao Shulian1,Guo Hon1lian1,Ni

HUAWEI WEI TE TECHNOLOGIES CO., LT LTD.

Huawei C Co onfien!ia"

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Hon1:ian1,8hu ;an,Chen /ui @ *"en ne&l%8$ilt or s&a3 a site. &e #an $se Crossed air Conne#ti Conne#tion on Dete#tion D$rin: Base Station De3lo+ent to find if t"ere is #rossed 3air #onne#tion and solve t"e 3ro8le+ on site . t"en #an red$#e t"e ti+es of :o to site=

Step $ ： Reverse "onnection of Antennas (etween "ells 1 @ *e #an find if t"ere t"ere is reverse #onne#tion #onne#tion of of antennas 8et&een #ells #ells 8 anal!e "andover "andover #o$nters and 3roe#t 3ara+eters. t"en de#ide if &e s"o$ld :o to site solve t"e 3ro8le+ 8 7=   > @ *e #an find if t"ere is reverse #onne#tio #onne#tion n of antennas 8et&een #ells 8 +a'in: #all test on site &"en ne&l%8$ilt or s&a3 a site=

Step  ： Deter&inin' *ath %aults (ased on .ra/c Statistics Related to (alance (etween )plin, Si'nal Level and Downlin, Si'nal Level ：

  *"en &e find t"ere is a8nor+al of traffi# statisti#s related to 8alan#e 8et&een $3lin' si:nal level and do&nlin' si:nal level . first &e #an anal!e 8 ste3 1 and ste3 >. if t"e 3ro8le+ is still e9ists. &e #an anal!e if t"ere is 3ro8le+ of t"e to&er a+3lifier or t"e #onfi:$ration of to&er a+3lifier is &ron:. or find if t"e 3o&er #onfi:$ration is in#orre#t=

Step 0 ： Su&&ary:

Solve t"e 3ro8le+ t"at "as fo$nd in t"e ste3 8efore and s$++ari!e "o&

to i+3rove=

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Huawei C Co onfdential

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  Detection !che+es   6ntenna connection fault 

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%hannel #ault Detection with the "ain and Diversity -evels

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%rossed Pair %onnection Detection During 7ase !tation Deploy+en Deploy+entt

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Reverse %onnection of 6ntennas 7etween %ells

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Deter+ining Path #aults 7ased on Traffic !tatistics Related to 7alance 7etween plin8 !ignal -evel and Downlin8 !ignal -evel

  Downlin8 %hannel #ault 

6ctions +ust be i+ple+ent

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Downlin8 %hannel #ault Detection 7ased on Power 

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Downlin8 %hannel #ault Detection 7ased on Downlin8 -evel

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#ault "ode B: #or !o+e TRXs in the %ell, 7oth the "ain 6ntenna 6ntenna -evel and the Diversity 6ntenna -evel 6re too -ow 

!u++ary: 3o( !u++ary:  3o( 'o-e T%' in !e +e"", *o! !e -ain an!enna "e&e" an !e i&e('i!) an!enna "e&e" a(e "owe(

!an 79< ?- fo( ua"7an!enna 'i!e'4. o( (e+i'e 8u$-en!. No!e Ti' +an on") *e u'e a' a 'u"e-en!a() -ean' *u! +anno! *e u'e ffo(

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Typical case: In case: In !e AF 'i!e, !e %SSI' of *o! !e -ain an!enna an ! !e e i&e('i!) an!enna of No.11 T% a(e "owe( !an 7100 ?-. Te "e&e"' of !e -ain an i&e('i!) an!enna' of o!e( T%', owe&e(, a(e no(-a". T(ou$ a!a ana")'i', we fin !a! !e (o*"e- o++u(' *e+au'e !e (e+ei&in$ -oe of No.11 T%, wi+ 'ou" *e +onfi$u(e +onf i$u(e !o Di&iin$ %e+ei&e(, i' w(on$") +onfi$u(e !o Ineenen! %e+ei&e(.

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#a$e 29

 

#ault "ode ? ： %rossing connection of %PR5 

!u++ary: Te(e a(e 2 %U' in one +e""', Te iffe(en+e *e!ween !e -ain an!enna "e&e" an i&e('i!) an!enna "e&e" of a"" T%' in !i' +e"" i' "e'' !an 6 ?, *u! !e iffe(en+e of u"in "e&e" of a"" T%' in ea+ %U i' $(ea!e( !an ;*, an !e(e a(e -o(e !an 2 +e""' a' !i' 'i!ua!ion in !e 'a-e 'i!e.



Typical case:  case: CSS% of one 'i!e i' &e() "ow, Af!e( ana")e we fin !e(e i' +(o''in$ +( o''in$ +onne+!ion of C#%I *e!ween !wo +e""' of !i' 'i!e.

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