【資料成文時間】：
【語言】：中文
【頁數(shù)】：15
【何人（公司）所著】：個人
【文件格式】：DOC
【文件原名】：省際長途來話信令中出現(xiàn)大量呼叫拒絕的情況分析
【摘要或目錄】：
一個網(wǎng)絡(luò)接通率異常的處理方法的整個過程，主要使用的方法包括：,TCTDI,UMPTI,TEST SYSTEM,SCREEN MARK，軟件補丁等。
省際長途來話信令中出現(xiàn)大量呼叫拒絕的情況分析
XX公司
XXX
關(guān)鍵字：EOS ,TCTDI,UMPTI,TEST SYSTEM,SCREEN MARK，軟件補丁，PLEX 。
網(wǎng)絡(luò)接通率從4月已經(jīng)正式列入了考核。但從4月份下旬開始，XX公司的網(wǎng)絡(luò)接通率一直不理想，特別是在忙時時段，從下午一直到晚上的22點，網(wǎng)絡(luò)接通率都不達標。以5月14日20點為例子，網(wǎng)絡(luò)接通率為91.86%。在該時段的網(wǎng)絡(luò)呼損率為8.14%,而其中“其它”項比較就高達8.04%,所以非常明顯，影響XX公司指標的主要是“其它”項的原因。
在省公司和YY公司的協(xié)助下，我們拿到了幾個時段的“其它”項呼損的詳細情況。也以14日20點的數(shù)據(jù)為例，“其它”項的呼叫次數(shù)為782次，而其中因為釋放原因是21，即呼叫拒絕的，就有606次，占了總數(shù)的77.5%，也就是說明該類呼叫拒絕的呼叫是影響指標的根本原因。
通過對數(shù)據(jù)的詳細分析，發(fā)現(xiàn)這一個小時里面產(chǎn)生的606次呼損主要集中在3臺被叫MS上（但主叫卻毫無規(guī)律，全國各地都有），次數(shù)和號碼如下：
號碼
| 次數(shù)
| 歸屬地
| 登記位置
|
13524619464 | 189 | 上海
| CYEMSC
|
13729286714 | 202 | XX
| CYEMSC
|
13729286717 | 171 | XX
| CYEMSC
|
通過分析得到的其它時段的數(shù)據(jù)，也是主要集中在這3臺MS上。
通過撥打這些手機，除了用戶忙之外，其它都是一聲振鈴后，后向拆線。所以我們結(jié)合TCTDI、UPMTI和TEST SYSTEM的手段對撥打進行了跟蹤，從跟蹤結(jié)果分析發(fā)現(xiàn)，對于一聲振鈴后，后向拆線的呼叫都具有以下的特征：
l
這些呼叫產(chǎn)生EOS=2552。
l
這些呼叫對應(yīng)的信令REL里面帶的CAUSE就是21，即呼叫拒絕。
l
都是登記在同個小區(qū)，金禧花園3。
l
根據(jù)IMEI，都是一種西門子的C系列手機
具體跟蹤記錄如下：
<ON VAR TRARE 39;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:04:50
EXECUTED
<ON VAR DO:IF V TRARE PR0:4(1)=1;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:04:50
DO:IF V TRARE PR0:4(2)=3;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:04:52
DO:IF V TRARE PR0:4(3)=7;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:04:56
DO:IF V TRARE PR0:4(4)=4;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:04:59
DO:IF V TRARE PR0:4(5)=5;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:02
DO:IF V TRARE PR0:4(6)=2;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:05
DO:IF V TRARE PR0:4(7)=2;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:07
DO:IF V TRARE PR0:4(8)=6;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:10
DO
RINT V;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:13
DO:;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:14
EXECUTED
<INIT;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:15
EXECUTED
<EXTPE:BNB=13929649903;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:54
EXECUTED
<EXTPI:BNB=13929649903;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:05:57
EXECUTED
<TCTDI:BNB=13729286717;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:06:11
RINGING OPERATOR
:READY FOR CONNECTION
CON;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:06:20
TEST CALL RESULTS
BNB
13729286717
R
DEV
RCODE
LOCKED
SELTYPE
CONTYPE
BSC1EO
MAL1-275
68
NO
RANDOM
STATIC
FREE SUBSCRIBER
END
::TEST CALL RESULTS
BNB
13729286717
R
DEV
RCODE
LOCKED
SELTYPE
CONTYPE
100
NO
RANDOM
STATIC
DISCONNECTION BEFORE B-ANSWER
END
:END;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:06:28
CONCLUSION OF COMMAND TCTDI
END
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:06:28
PROGRAM TRACING
(1)
ON VARTRARE
VAR H'00 28E4:H'027(H'0002)=H'0000
TRARE
VAR H'00 28CE:H'027(H'0000)=H'09F8
//EOS=2552
下面是跟蹤2552產(chǎn)生的原因：
<ON IN MTB RELEASECMLAY1;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:06
EXECUTED
<ON IN DO:IF DR2=2552;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:16
DO SWD;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:28
DO:;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:29
EXECUTED
<INIT;
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:30
EXECUTED
<
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:31
PROGRAM TRACING
(1)
ON INSIG
MTB
BUFSIG
LSN=H'099 RELEASECMLAY1 ON THL
FROM MTBCC WITH
H'00 0DB1
H'0000, H'0006, H'09F8, H'0000, H'0001, H'0000,
H'00FF
END
<
NE: CYEMSC
ID: 14976995
TIME: 05/18/2005
11:56:35
PROGRAM TRACING
(1)
ON INSIG
MTB
BUFSIG
LSN=H'099 RELEASECMLAY1 ON THL
FROM MTBCC WITH
H'00 0E11
H'0000, H'0003, H'09F8, H'0000, H'0001, H'0000,
H'00FF
END
根據(jù)撥測的時間，第2個SIG才是對應(yīng)我們撥測的結(jié)果.從結(jié)果看DRO（即D2）=3, DR1=H’09F8,查找PELX，結(jié)果如下：
DOCUMENT RELEASECMLAY1;
SIGNAL RELEASECMLAY1;
! 34158/15514-ANT 292 01
REV. A !
! FUNCTION:
ORDER DISCONNECTION OF CM LAYER !
TYPE 1
MULTIPLE CP-CP;
! SINGLE SIGNAL !
! COMMUNICATION:
SENDER:
MTACC, MTBCC
RECEIVER:
MTA, MTB !
LEVEL B BUFFER;
DATA D1
16 , ! RECEIVING INDIVIDUAL !
D2
16 , ! DISCONNECT REQUEST REASON !
D3
16 , ! AXE INTERNAL CAUSE CODE !
D4
16 , ! EOS CODE !
D5
16 , ! CAUSE LOCATION !
D6
16 , ! DISCONNECTION INDICATOR !
D7
16 , ! VALIDITY INDICATOR FOR BSSMAP/RANAP CAUSE CODE !
D8
16 ; ! BSSMAP/RANAP CAUSE CODE !
! DETAILED DATA DESCRIPTION:
D2: DISCONNECTION REASON
0
=
MISCELLANEOUS FAULT
1
=
NORMAL CLEARING
2
=
ASSIGNMENT FAILURE
3
=
CALL REJECTED BY SUBSCRIBER
4
=
SUBSCRIBER BUSY
5
=
CALL TEARDOWN, COMMAND INITIATED
6
=
CALL TEARDOWN DUE TO LOCATION CANCELLATION
7
=
SETUP MESSAGE CAN NOT BE SENT TO GSM ACCESS
8
=
SETUP MESSAGE CAN NOT BE SENT TO UMTS ACCESS
9-
SPARE
D5: CAUSE LOCATION
0
= USER
1
= PRIVATE NETWORK SERVING THE LOCAL USER
2
= PUBLIC NETWORK SERVING THE LOCAL USER
3
= TRANSIT NETWORK
4
= PUBLIC NETWORK SERVING THE REMOTE USER
5
= PRIVATE NETWORK SERVING THE REMOTE USER
6
= RESERVED
7
= INTERNATIONAL NETWORK
8
= RESERVED
9
= RESERVED
10 = NETWORK BEYOND AN INTERWORKING POINT
11 - 15 RESERVED
16-
SPARE
D6: DISCONNECTION INDICATOR
0
= DO NOT WAIT FOR ONGOING MM/RR LAYER PROCESS
1
= WAIT FOR ONGOING MM/RR LAYER PROCESS
2-
SPARE
D7: VALIDITY INDICATOR FOR BSSMAP/RANAP CAUSE CODE
0
= NOT VALID (NO VALID DATA IN D8)
1
= BSSMAP CAUSE CODE IN D8
2
= RANAP CAUSE CODE IN D8
ALL OTHER VALUES ARE NOT USED
D8: BSSMAP/RANAP CAUSE CODE
FOR BSSMAP CAUSE CODES SEE:
GSM SPECIFICATION 08.08
FOR RANAP CAUSE CODES SEE:
3GPP TECHNICAL SPECIFICATION 3G TS 25.413
!
! MISCELLANEOUS INFORMATION:
IF D2 = 5,6 THEN D4 IS NOT VALID
!
END SIGNAL;
可以看到3
=
CALL REJECTED BY SUBSCRIBER，說明這是由于用戶拒絕產(chǎn)生的，
對于EOS=2552，我們嘗試了轉(zhuǎn)到通知音和發(fā)CAU，但是從跟蹤的信令上都是無效的，系統(tǒng)還是發(fā)送CAUSE=21的REL消息。
我們同時查找了這2個XX用戶的清單，發(fā)現(xiàn)用戶在近2個月來沒有任何一個呼出的記錄，只有非常少的幾個被叫的記錄，同時通話時長都是1到2秒。也沒有任何的短信的收發(fā)記錄。所以基本判斷用戶應(yīng)該是涉及六合彩。
為了盡快的減輕這些用戶行為給我們指標帶來的影響，我們采取了以下的措施：
l
由于用戶沒有呼出的記錄，所以我們通過腳本的方式，周期的對這些用戶的位置進行清除，減少EOS2552的產(chǎn)生。但該方式只能是臨時措施，因為我們首先無法確認這些用戶是否非法,有可能帶來用戶的投訴，其次是發(fā)現(xiàn)用戶頻繁的換號碼，所以該措施的作用非常的有限。
l
利用SCREEN MASK的方法，在MSC把2552產(chǎn)生的CAUSE=21強制轉(zhuǎn)化為CAUSE=17（用戶拒接）。由于在方法在修改數(shù)據(jù)時需要一個臨時補丁才能完成。因為要如果修改SCREEN MARK的話，交換機會判斷該類型的SCREEN MARK是否已經(jīng)連到某一信令點，如果連的話，需要把信令點也拆點，所以我們必須打個臨時的補丁，跳過這個判斷。
原程序如下：
WHEN ZMASKFOUND DO
IF MASKP : NUMBEROFCONNECTEDDEST /= ZNODESTCONNECTED THEN
RSA
DR0- 53;
(NUMBEROFCONNECTEDDEST)
1B51 0759
JUC
DR0, 0, %L%3990;
07691826 075A
RSU
DR0- 102;
(NUMBEROFOLDNOTREADYDEST)
00066610 075C
JUC
DR0, 0, %L%4000;
076E1826 075E
RSA
DR0- 4;
(NUMBEROFOLDREADYDEST)
1841 0760
JUC
DR0, 0, %L%4010;
07751826 0761
RSU
DR0- 103;
(NUMBEROFTESTDEVICES)
00066710 0763
JUC
DR0, 0, %L%4020;
077A1826 0765
JLN
%ELSEL%4030;
078100DF 0767
%L%3990)
LCC
AR0- 10;
7A87 0769
TRESULTCODE = ZDESTCONNTOMASK;
//出錯代碼：=10
DO SENDCHANGESCRN1R;
//返回命令錯誤提示：
//DESTINATION(S) CONNECTED TO
//SCREENING MARK
ELSIF MASKP:NUMBEROFOLDNOTREADYDEST /= 0 THEN
TRESULTCODE = ZSMUSEDBYTHEPROTOCOL;
DO SENDCHANGESCRN1R;
ELSIF MASKP:NUMBEROFOLDREADYDEST /= 0 THEN
TRESULTCODE = ZDESTCONNTOMASK;
DO SENDCHANGESCRN1R;
ELSIF MASKP:NUMBEROFTESTDEVICES /= 0 THEN
TRESULTCODE = ZSMCONNECTEDTOTESTDEVICE;
DO SENDCHANGESCRN1R;
ELSE
TMHMASKPTR = MASKP : MHMASKPTR;
%ELSEL%4030)
RSA
AR0- 47;
(MHMASKPTR)
7AF1 0781
最終我們采取了第二種的措施。
補丁如下：
IOEXP;
LASIP:BLOCK=UPS;
PCODP:BLOCK=UPS,IS=H'759-H'765;
PCORL:BLOCK=UPS,IS=H'759-H'765,CI=TEMP;
END;
PCODP:BLOCK=UPS,IS=H'759-H'765;
PCORI:BLOCK=UPS,IA=H'759;
PCODP:BLOCK=UPS,IS=H'759-H'765;
!CHECK SYSTEM STATUS
PCORS:BLOCK=UPS,IA=H'759;
UPSMC;
PRORE:BLOCK=UPS,IA=H'759;
PRORR:BLOCK=UPS,IA=H'759;
PCODP:BLOCK=UPS,IS=H'759-H'765;
補丁激活后，即可對SCREEN MARK進行修改。
<UPSMP:SM=CNMDEF;
USER PART SCREENING MASK DATA
SM
SI
NI
DS
CNMDEF
ISUPC24
2
NO
DIR
R
ACT
MI
PI
PFI
PFV
NPFV
U-P
ACM
46
U-P
ACM
243
A-F
ACM
18
2
1
31
A-F
ACM
18
2
5
31
具體PRINTOUT可以見ALEX，這里就不一一解釋了。
SCREEN MARK修改指令如下：
UPSMC:SM=CNMDEF,DIR=S,ACT=A-F,MI=REL,PI=18,PFI=21,PFV=17;
就是在REL消息里面，把CAUSE CODE=21轉(zhuǎn)換為17。
A-F
REL
18
2
21
17
為驗證修改后的效果，我們在GW和CYEMSC建了一條2個設(shè)備的專用路由，同時修改TCON的參數(shù)，保證在GW的TCTDI的話務(wù)走在我們的專用路由上，方便我們進行UPMTI的跟蹤，下面是經(jīng)過SCREEN MARK修改后，進行TCTDI撥測的UPMTI結(jié)果：
<TCTDI:BNB=13670434591,ANB=020001;
NE: STGW2
ID: 15503350
TIME: 05/22/2005
12:20:48
RINGING OPERATOR
:
READY FOR CONNECTION
CON;
NE: STGW2
ID: 15503350
TIME: 05/22/2005
12:21:03
TEST CALL RESULTS
BNB
13670434591
R
DEV
RCODE
LOCKED
SELTYPE
ECDH
ECDH-2492
68
NO
RANDOM
FREE SUBSCRIBER
END
:
TEST CALL RESULTS
BNB
13670434591
R
DEV
RCODE
LOCKED
SELTYPE
100
NO
RANDOM
DISCONNECTION BEFORE B-ANSWER
END
CONCLUSION OF COMMAND TCTDI
END
UPMTI的結(jié)果
ORDERED
<
NE: STGW2
ID: 15503365
TIME: 05/22/2005
12:21:04
ISUP MESSAGE MONITOR RESULT
USER
SI
CIC
SPN
DEV
CALLREF
EXT-9
ISUPC24
595
2-19-250-196
UPD-20191
TIME
MSG
DIR
DATA
12:20:39:8
IAM
S
85
C4
FA
13
23
FE
13
03
53
02
01
10
40
00
F2
03
02
0A
08
83
10
31
47
25
62
74
01
0A
06
83
13
20
00
10
0F
00
TIME
MSG
DIR
DATA
12:20:48:1
ACM
R
85
23
FE
13
C4
FA
13
03
53
02
06
16
34
01
29
01
01
00
TIME
MSG
DIR
DATA
12:20:49:2
REL
R
85
23
FE
13
C4
FA
13
03
53
02
0C
02
00
02
80
91
TIME
MSG
DIR
DATA
12:20:49:2
RLC
S
85
C4
FA
13
23
FE
13
03
53
02
10
00
END<
對其進行解碼：
USER
SI
CIC
SPN
DEV
CALLREF
EXT-9
ISUPC24
595
2-19-250-196
UPD-20191
(S) <== IAM : Time = 12:20:39:8
+++
NATURE OF CONN. INDICATORS : 10
-
Satellite Indic (AB) : 10
No Satellite circuit in Connection
-
Continuity Check Indic (CD) : 10
Continuity check not required
-
Echo Contr. Dev. Indic (E) : 10
Outgoing echo contr dev included
+++
FORWARD CALL INDICATORS : 40
-
National / Internat. (A) : 40
Treat as national call
-
End-To-End Method Ind (BC) : 40
No END-TO-END method available
-
Interworking Indic.
(D) : 40
No Interworking encountered, C7 all the way
-
End-To-End Inform Ind (E) : 40
No END-TO-END information available
-
ISDN User part Ind.
(F) : 40
ISDN user part not used all the way
-
ISDN User Part Pref
(GH) : 40
ISDN user part preferred all the way
-
ISDN Access Indicator (I) : 00
Originating access NON-ISDN
-
SCCP Method Indicator (JK) : 00
No Indication
-
VPN Call Indicator
(PO) : 00
Non VPN Call
+++
CALLING PARTY CATEGORY : F2
Interpretation is Network Specific
+++
TRANSM MEDIUM REQUIREMENT : 03
3.1 Khz audio
+++
CALLED PARTY NUMBER :
-
Nature of Addr Indic. (AG) : 83
National (significant) Number
-
Numbering Plan Indic. (EG) : 10
ISDN numbering plan
-
Internal Netw Numb (H) : 10
Routing to Internal Network Allowed
==
Called Party Number :
13745226471
+++
CALLING PARTY NUMBER :
-
Nature of Addr Indic. (AG) : 83
National (significant) Number
-
Numbering Plan Indic. (EG) : 13
ISDN numbering plan
-
Screening Indic. (AB) : 13
Network provided screening
-
Present. Indic. (CD) : 13
Presentation allowed
-
Num Incomplete Ind (H) : 13
Number Complete
==
Calling Party Number :
020001F
(R) ==> ACM : Time = 12:20:48:1
+++
BACKWARD CALL INDICATOR : 16
-
Charge Indicator (AB) : 16
Charge
-
Called Party Status (CD) : 16
Subscriber free
-
Called Party Category (EF) : 16
Ordinary subscriber
-
End-To-End Indicator (GH) : 16
No END-TO-END method available
-
Interworking Indicator (I) : 34
No interworking encountered
-
End-To-End Info Indic (J) : 34
No END-TO-END information available
-
ISDN UserPart Indicator (K) : 34
ISDN user part used all the way
-
Holding Indicator (L) : 34
Holding not requested
-
ISDN Access Indicator (M) : 34
Terminating access ISDN
-
Echo Control device ind (N) : 34
Incoming echo contr dev included
-
SCCP method Indicator (OP) : 34
No Indication
+++
OPTIONAL BACKW CALL IND :
-
In-Band Info Ind (A) : 01
In-band info or an appropriate pattern available
-
Call Div may occure Ind (B) : 01
No Indication
-
Simple Segmentation Ind (C) : 01
No additional info will be sent
-
MLPP User Indicator (D) : 01
No Indication
-
Timesup before answ Ind (G) : 01
Timesupervision before answer
-
Last Party Release Ind (H) : 01
Ordinary Release
(R) ==> REL : Time = 12:20:49:2
+++
CAUSE INDICATORS :
-
Coding Standard (FG) : 80
ITU-T standard Coding
-
Location (AD) : 80
User (U)
==
Cause Value : 91
(17)
Normal Event, User Busy
(S) <== RLC : Time = 12:20:49:2
從結(jié)果看，已經(jīng)是17了，完全符合集團公司信令監(jiān)控系統(tǒng)的統(tǒng)計為非網(wǎng)絡(luò)原因的失敗的條件。至此，該情況完全解決。
經(jīng)過對SCREEN MARK進行修改后，我們的網(wǎng)絡(luò)接通率已經(jīng)超過了省公司的94％挑戰(zhàn)值。
注：以上的交換機軟件都是R9版本的。
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本帖最后由 bestlcf 于 2010-2-10 17:42 編輯 ]
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