Ura PCH

 

&!'()e"*e S+ar!* February, Februar y, !"  #$% 

Session Number 7th 

PRIVILEGED AND CONFIDENTIAL. THE INFORMATION CONTAINED IN THIS MATERIAL IS PRIVILEGED AND CONFIDENTIAL, AND IS INTENDED ONLY FOR THE USE OF THE INDIVIDUAL TO WHOM IT IS ADDRESSED AND OTHERS WHO HAVE BEEN SPECIFICALLY AUTHORIZED TO RECEIVE IT. IF YOU ARE NOT THE INTENDED RECIPIENT, YOU ARE HEREBY NOTIFIED THAT ANY DISSEMINATION, DISTRIBUTION OR COPYING OF THIS MATERIAL IS STRICTLY PROHIBITED. IF YOU HAVE RECEIVED THIS MATERIAL IN ERROR, PLEASE DESTROY IT IMMEDIATELY.

 

Agenda 

DCR De-!'!



DCR Rea/'!/



DCR C'u!er/



DCR Para0eer/

 

 A12y Carre" Carre" -'r DCR 03r'2e0e! POST I03a1

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DCR-Retainibility



 

Rea!ab)y / "e-!e" a/ +e ab)y ab)y '- u/er ' rea! / re4ue/e" /er21e '!1e 1'!!e1e" -'r +e "e/re" "ura'!.



  

  

Ma5'r Fa1'r/ (+1+ a--e1!* +e rea!ab)y 6

Mobility  Mobility  I!er7I!ra 6 -re4ue!1y Ha!"'2er 8S'-7S'-er9 I!er Ra"' a11e// Te1+!')'*y Ha!"'2er8IRAT HO9

Coverage Ra"' C'!!e1'! /u3er2/'! 8RCS9 Ra"' L!: 1'!r')8RLC9

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DCR-Retainibility 

Congestion Control

 

Ver-y CE u/a*e ; HW a))'1a'!. Ver-y Fa)ure "ue ' )a1: '- DL 3'(er ; 1'"e/.

    

Others Tra!/3'r !e('r: 3r'b)e0 Har"(are -au)/. UE Pr'b)e0. Ce)) "'(!0e.

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DCR-Approches Rea!b)y

M//!* Nbr

S'- Ha!"'2er

U3)!: Sy!1+





C+e1: RBS HW a)ar0 ; NBR 1e)) a)/'.



C+e1: RL A"" ae03 -a)ure. C+e1: 1e)) a2a)ab)y . Ver-y SC 1)a/+e/







 A"" /u**e/e" Ne*+b'r/ (+ WNCS7Dr2eTe/  A!a)y// e OSS 1'00e!"9

IRAT  

C'!*e/'!

C+e1: GSM 1'2era*e area C+e1: re/'ur1e/ a2a)ab)y 8TAVAACC 8TAV AACC -'r - 'r G9



Fa)ure "ue ' )a1: '- DL 3(r ; 1'"e/.

 

Ver-y U/a*eCE   ; HW a))'1a'!

O+er/    

Tra!/3'r //ue. Har"(are -au) .UE 3r'b)e0. Ce)) "'(!0e.

 

DCR-Retainibility



Counters for DCR

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Drops due to Missing Neighbor 

Based on WNCS analysis Nbr Addition done which decreases the No. of drop due to missing Nbr

| ? TEOCO PROPRIETAR PROPRIETARY Y AND CONFIDENTIAL

| 7

 

Drops due to Missing Neighbor  700 %00

Nbr Addition done

$00 #00 "00 !00 00 0

C&'0 #

  

(&'0 

(&'0 "

 A/ 3er WNCS re/u) 3'e!a) !e*+b'r/ (ere a""e" ! !e('r:.8A33r'< ###@9 O!e (ay !e*+b'r/ a)/' a""e" ! !e('r:.8A33r'< ##@9 =#6De1 '!(ar"/ 0//!* !e*+b'r 1'u! re"u1e".

NCS )Networ*

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NCS-CDMA Neighbouring Neighbouring Cell Support

Limitation + ,ou can schedule only "00 Cell across $ &NC in WNCS.

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Drops due to Soft handover  Chec* all ser-ice aecting alarm. Chec* Cell a-ailability/chec* administrati-e state01 23C4'( 5 6N23C4'( 1  8erify SC clashes.

Nbr Addition done

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Drops due to Soft handover 

Nbr Addition 5 (2 code ad9ustment done on % th :an

 

dlCodeAdm +Admission limit based on downlin* channeli;ation code tree usage. deally it should not be more than we need to chec* few alarms.

           

'-ery alarm pro-ided the following information. '-ent @ype+ >ndicates type of e-ents. Communication alarm rocessing erroralarm alarm 'n-ironmental uality of ser-ice alarm. 'uipment alarm ercei-ed Se-erity+ indicates the relati-e le-el of urgency ercei-ed Critical Da9or Dinor Warning

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 A))ar0   A 

?ew commands for chec*ing (aily alarms.  altCurrent alarms  alaCurrent Alarms with details.  lh ru fui get -swrget 8SW&   2go3pererational history of nodeB

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Drops due to !" Synch  ?or

the 62 synch drop issue need to chec* the o-ershooting cellE>FE cell E>FE &ACE  >f high &ACE obser-ed need to optimi;e these cellhysicalGparameter 9.

As per WD&& we can see that Eigh 6' @H pwr obser-ed.

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Drops due to !" Synch

  pmH

Im !# prach prop Ia with the help 3SS command we can chec* the propagation dealy in nodeB

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#RAC$ Analysis%

Recommendation:  Cell ha-ing high &ACE. Need to optimi;e Jrst..  Dissing "F/!F neighbor can added furtherK if any.

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Drops due to !" Synch

C& implemented

 r)Fa)ure r)Fa)ure Guar" 3er'" be-'re /e!"!* RL Fa)ure .

U! #.$ /, ra!*e/ U! ra!*e/ #..%%,  #..%%,"e-au) "e-au) $#  !OuSy!1I!" Nu0ber '- -ra0e/ ' be 1'!/"ere" -'r 'u6'-6/y!1 "ee1'!.   ra!*e/ $..%,"e-au) $#

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Drops due to !" Synch

  !OuSy!1I!" parameters

implementation drop decreases.

tuning done for top contributor for 62 6 2 drop on %th :an post

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Drops due to !" Synch



+

0!P(rR) 3ara0eer/ 0!P(rR)  3ara0eer/ u!!* "'!e -'r '3 1'!rbu'r -'r UL "r'3 '! $  a! 3'/ 03)e0e!a'! "r'3 "e1rea/e/. 0!P(rR)  0!P(rR)   M!0u0 3'(er 3er ra"' )!:.

  De-au) De-au) 6$%# "B0.

minpwr changes&2 done for "7 Cells on !th :AN

  !OuSy!1I!" parameters

implementation drop decreases.

tuning done for top contributor for 62 6 2 drop on %th :an post

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IRAT6Dr'3  >&A >&A@ @

 

inter &adio access technology t echnology hando-er and cell change allow "F 8oice 5 data ser-ices WC(DA &AN to FSD transition to maintain the connection with the 6' be(ee!

1'2era*e

  area to pre-ent drop calls 

Dain causes for >&A@ drop+  Wr Wrong ong (eJnition BCCEGBS>CG2AC  Dissing !F relation.  Non A-ailability of !F resources.  oor !F co-erage.

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C'!*e/'! C'!r')   Congestion 

  

   

control algorithms has the ability to drop calls when cell congestion is detected.

Congestion mainly comes due to resources crunch in the nodeBGnetwor*Kso need to augmented the recourses as per planning guidelines.  As we can obser-ed from below graph there is few cases only in the networ* where drop due to congestion.

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Drop due to others reason  

>n second phase of (C& optimi;ation drop due to others reason will ta*e in consideration.  @he percentage of drops drops due to reasons other than DobilityK Congestion Control or Co-erage can be calculated using the formula+  

 

00L pmNoSystem&ab& pmNoSystem&ab&eleaseSpeech/pmNoSys&elSpeechSoEo/pmNoSys&elSpeech62Synch/ eleaseSpeech/pmNoSys&elSpeechSoEo/pmNoSys&elSpeech62Synch/ pmNo3f@ermSpeechCong

1 pmNoNormal&ab&eleaseSpeechMpmNoSystem&ab&eleaseSpeech

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UE Related Problems Some terminal related problems non/6@&AN could be present especially in the data cards or new generation mobiles aecting retainability for S ser-ices. Sometimes application layer errors cause the terminal restarting or free;ingK and the connection is released. @hese types of failures are normally seen as co-erage drops although it may be worth while analy;ing these drops based on >D'> and Jnding the associated 6' type.

Transport Network 

 @he drops drops due to problems problems in the the @N occur especially especially in mobilityK mobilityK since it is not possible to add add the cell belonging belonging to the site with @N issues in the acti-e set.  @hese drops drops are are more similar similar to co-erage co-erage drops due to interference interference from from the target target cell that cannot be added. added.  @o  @ o in-estigate in-estigate @ransport @ransport Networ* Networ* issuesK issuesK subscription subscription proJles should should be set up up to collect a range range of transport transport networ* counters that may be used to conJrm that there is congestion in this area. Sometimes the problems can be due to wrong @N conJguration. >n these casesK a re-iew of the @N design would be needed to sol-e problems in @N.

Hardware Issue >n order to detect EW faults that are causing low retainability performancesK it is -ery important to loo* at alarms in the node. After a Jrst analysis has been made by the alarmsK it could be useful to put speciJc traces in the node.

Cell Downtime I! 1a/e 0a!e!a!1e '3era'!/ are 3er-'r0e" ! +e !e('r:, 1'!!e1'!/ are re)ea/e" /u""e!)y ! +e !'"e (+ere +ey are e be)'( are +e Dr'3 "/rbu'! by UE.

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