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7/24/2019 CH-Termination Call Fall Reason Analysis
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XIAMEN CDMA
2002. 01
7/24/2019 CH-Termination Call Fall Reason Analysis
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1. Paging Algorithm Problem
1.1 Problem of Paging Area
1.2 Timing of 2 nd Paging and Timeout Problem
2. Mobile Station State Management Problem
2.1 State Management Fault of Idle Mobile Station as Busy State
2.2 Long Bad F rame Timer & Information Message Problem
2.2 State Management Error after Call Drop
2.3 Problem of Critical Case
3. Time based Registration Problem
4. The Other Problem
5. General Opinion
AGENDA
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1.1 Problem of Paging Area
1. Paging Algorithm Problem
1.1.1 Xiamen CDMA Zone Paging Area
1.1.2 Problem
Paging Zone
Island Area(BSC00) Land Area (BSC00) 2 ZonePaging Area1 Paging : Mobile Station VLR Zone 2 Paging : 1 Paging
Paging Zone Island Area(BSC00) Land Area (BSC00) 2 ZonePaging Area1 Paging : Mobile Station VLR Zone 2 Paging : 1 Paging
1. Zone Mobile Station Zone Based Registration Idle State PN Offset 2. Zone Mobile Station BTS ZONE(513) MSC Mobile Station Zone ID(51
3. , MSC Mobile Station Zone(514) Page Massage Mobile Station
Page Response4. XiamenCDMA Zone The Mobile you
dialed is not in service region? ? ?
1. ZoneMobile Station Zone Based RegistrationIdle State PN Offset 2. Zone Mobile Station BTSZONE(513) MSC Mobile StationZone ID(51
3. , MSC Mobile Station Zone(514) Page MassageMobile Station
Page Response 4. XiamenCDMAZone The Mobile you
dialed is not in service region? ? ?
ZONE 513ZONE 514
ZONEMSC
000-0000-0000
VLR
000-0000-000Is in ZON
Paging to zone 514
No Page Response
Paging
Paging
Paging
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1.1 Problem of Paging Area (Continued ..)
1. Paging Algorithm Problem
1.1.3
Solution 1) 1 Paging Area
1. 1 Paging Area: Mobile Station VLR Zone Zone (Zone 513, 514)(MSC )
2. Zone Page MassageMobile Station Page Massage Response 3. Mobile Station Zone Zone Page Massage
Pag ing 8
1. 1 Paging Area: Mobile Station VLR Zone Zone (Zone 513, 514)(MSC )
2. Zone Page MassageMobile Station Page Massage Response 3. Mobile Station Zone Zone Page Massage
Pag ing 8
ZONE 513ZONE 514
ZONEMSC
000-0000-0000
VLR
000-0000-0Is in ZO
Paging to Zone 513and Zone 514
Page Response
Paging
Paging
Paging
Paging
Paging
Paging
Paging
Response
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1.1 Problem of Paging A rea(Continued ..)
1. Paging Algorithm Problem
1.1.3
Solution 1) 2 Paging Area Better then Solution 1
ZONE 513 ZONE 514
ZONE MSC
000-0000-0000
VL
000-000-0Is in Z
1stPagingto Zone 513
No Page ResponsePaging
Paging
Paging
ZONE 513ZONE 514
ZONE
000-0000-0000
2ndPagingtoZone513andZone514
Page Response
Paging Paging
Paging
Paging
Paging
Paging
PagingResponse
1. 1 Paging Area Mobile StationVLR Zone1 Page MassageRespons2. 2 Paging Area Zone(513, 514) Mobile StationResponse 3. Solution 1 Paging
1. 1 Paging Area Mobile StationVLR Zone1 Page MassageRespons2. 2 Paging Area Zone(513, 514) Mobile StationResponse 3. Solution 1 Paging
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1.2 Timing of 2 nd Paging and T imeout Problem
1.2.1 Xiamen CDMA Switching System Page Response Timeout
1. Paging Algorithm Problem
MSC (VLR) BSCBTS
BCP Paging Channel MS
st Paging
2nd Paging8Sec
8SecTime Out
1. MSC 1 Page Massage Mobile Station Page Response Massage 8Sec
2. 8Sec Mobile Station Page Response Switching MSC 2 Page Massage 3. 2 Page Massage 8Sec Mobile Station Page Response MSC Timeout
1. MSC 1 Page Massage Mobile Station Page Response Massage 8Sec
2. 8Sec Mobile Station Page Response Switching MSC 2 Page Massage 3. 2 Page Massage 8Sec Mobile Station Page Response MSC Timeout
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1.2 Timing of 2 nd Paging and Timeout Problem(Continued ..)
1.2.2 Mobile Station Access Probe
1. Paging Algorithm Problem
1. Access Channel 1Frame 20msec 2. Access Channel Slot MSA_PARA PREAMBLE SIZE MAX CAP SIZE
- Access Channel Preamble= Preamble_Size + 1 = 4 Frame (Access Channel 1Frame 96bit (All 0))
- Access Channel Massage Capsule= Max_Cap_Size+ 3 = 6 Frame
3. Access Probe(Slot) 10 Frame
1. Access Channel 1Frame 20msec
2. Access Channel Slot MSA_PARA PREAMBLE SIZE MAX CAP SIZE
- Access Channel Preamble= Preamble_Size + 1 = 4 Frame (Access Channel 1Frame 96bit (All 0))
- Access Channel Massage Capsule= Max_Cap_Size+ 3 = 6 F rame
3. Access Probe(Slot) 10 Frame
Xiamen CDMA Access Channel Slot
Frame(20msec)
Access Channel Preamble (4Frame) Access Channel Massage Capsule (6Frame)
1 Access Probe (10Frame)
Xiamen CDMA MSA Parameter
NOM_PWR = 0, INI_PWR = 5, PWR_STEP = 6, NUM_STEP = 5
MAX_CAP_SIZE = 3, PREAMBLE_SIZE = 3
ACC_TMO = 5, BACKOFF = 1, PROBE BACKOF F = 0
MAX_REQ_SEQ = 2, MAX_RSP_SEQ = 2
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1.2 Timing of 2 nd Paging and Timeout Problem(Continued ..)
1.2.3 Mobile Station Access Probe
1. Paging Algorithm Problem
Xiamen cdma Access Probe, Sequence Time (Response Access )
AccessProbe 1
AccessProbe2
AccessProbe3
TA RT TA RT TA
PI
PI
IP
AccessProbe6
Access Attempt
AccessSequence1
AccessSequence2
RS
1. One Probe = 10 Frame = 200msec
2. TA(Ack Response Timeout)
( 80 (2 + ACC_TMO) = 560msec
3. RT ( Probe Backoff )(1 + PROBE_BKOF F) = 1Slot = 200msec
4. RS (SequenceBackoff)
(1 + BACKOFF) = 2Slot = 400ms
5. Mobile Station Maximum Access Time
12 ( Probe + TA ) + 10RT + RS
= 12 ( 200 + 560 ) + 10 * 200 + 400
= 11520msec = 11.52sec
1. One Probe = 10 Frame = 200msec
2. TA(Ack Response Timeout)
( 80 (2 + ACC_TMO) = 560msec
3. RT ( Probe Backoff )(1 + PROBE_BKOF F) = 1Slot = 200msec
4. RS (SequenceBackoff)
(1 + BACKOFF) = 2Slot = 400ms
5. Mobile Station Maximum Access Time
12 ( Probe + TA ) + 10RT + RS
= 12 ( 200 + 560 ) + 10 * 200 + 400
= 11520msec = 11.52sec
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1.2.4 Problem
1. Paging Algorithm Problem
AccessAttempt
AccessSequence1 AccessSequence2
11.5 Sec
MSC(VLR) BSCBTS
BCP Paging Channel
1st Paging
2ndPaging8Sec
8SecTime Out
1.2 Timing of 2 nd Paging and Timeout Problem(Continued ..)
.Mobile Station 1 Page Massage Response Probe MSC 2 Page Massage
MSC 1 Pag ing 1 Paging Response MSC1 Paging Response
MSC1 Paging
.Mobile Station 2 Page Massage Response Probe MSC Timeout
1 Pag ing Messag e 1 Paging Response MSC 2 Pag ing
1 Pag ing Response 2 Paging
. Field The mobile you called is
reachable? ? Page Response Access Sequence Sync 2~3
2 Paging
.Mobile Station 1 Page MassageResponse ProbeMSC 2 Page Massage
MSC 1 Paging 1 Paging Response MSC 1 Paging Response
MSC1 Paging
.Mobile Station 2 Page MassageResponse ProbeMSCTimeout
1 Paging Message 1 Paging Response MSC 2 Paging
1 Paging Response 2 Paging
. Field The mobile you called is
reachable? ? Page Response Access Sequence Sync 2~3
2 Paging
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1.2.5
1. Paging Algorithm Problem
1. Page Massage MSC BSS System Transmission Delay
2. Slot Cycle Index = 2 Mobile Station Idle 5.12 Page Slot Page Massag
BTS 5.12 Delay
3. Mobile Station Probe Sync Channel Page Massage 2Sec
3. 2 Pag ing Timeout Maximum Mobile Station Access Time + Slot Cycle Index Value + State Transit Time
? 11.52 + 5.12 + 2 = 18.64 19Se c
3. Case 2 Paging
2 Paging Time 15Sec, Timeout Time 17Sec
1. Page Massage MSC BSS Sys tem Transmission Delay
2. Slot Cycle Index = 2 Mobile Station Idle 5.12 Page Slot Page Massag
BT S 5.12 Delay
3. Mobile Station Probe Sync Channel Page Massage 2Sec
3. 2 Paging T imeout Maximum Mobile Station Acces s T ime + Slot Cycle Index V alue + State T ransit T ime
? 11.52 + 5.12 + 2 = 18.64 19Sec
3. Case 2 Paging
2 Paging T ime 15Sec, Timeout Time 17Sec
Acces sAttempt
AccessSequence1 AccessSequence2
11.5 Sec
MSC(VLR) BSCBT S
BCP Paging Channel
1st Paging
2ndPaging15Sec
17SecTime Out
1.2 Timing of 2 nd Paging and Timeout Problem(Continued ..)
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2. Mobile Station State Management Problem
1. Mobile Station Idle State MSC Busy State
2. Mobile Station MSC Busy Massage The Mobile you called is
busy now? ? ?
3. MSCMobile StationState Management
1. Mobile StationIdle State MSC Busy State 2. Mobile Station MSC Busy Massage The Mobile you called is
busy now? ? ?
3. MSCMobile StationState Management
MSC
000-0000-0000
Idle State
000-0000-0000
Is in Busy State
No Page Massage
xxx-xxxx-xxxx
Connect Request
000-0000-0000Is Busy
000-0000-0000Is Busy
Call000-0000-0000
Not Same
2.1 State Management Fault of Idle Mobile Station as Busy State
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2. Mobile Station State Management Problem
1. Mobile1 Call Drop MSC Mobile1 Mobile1 Idle State Mobile2 Bad F rame Timer Your radio connection has been interrupted? ?
2. Bad Frame Timer 5~10Sec, 20~30SecMobile2Call Drop
40SecTraffic
3. 40Sec Traffic State Mobile2 , The
Mobile you called is busy now? ? ?
4.
1. Mobile1Call Drop MSC Mobile1 Mobile1Idle State
Mobile2Bad Frame Timer Your radio connection has been interrupted? ?
2. Bad Frame Timer 5~10Sec, 20~30SecMobile2Call Drop 40SecTraffic
3. 40Sec Traffic State Mobile2 , The
Mobile you called is busy now? ? ?
4.
2.2 Long Bad Frame Timer & Information Massage Problem
MSC
Mobile1 Mobile2BTS
ReleaseRelease
Call Drop by Mobile1
InformationMsgAfter Bad Frame Timer
InformationMsgAfter Bad Frame Timer
Mobile1 = IdleMobile2 = busy
2 S S
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2. Mobile Station State Management Problem
1. 2.2 Mobile1 State Management
2. Call Drop Mobile1 Idle State MSC Mobile1 Busy State 3. Mobile1 (2~ 5 , The Mobile you called is busy now .. )
4. MSCMobile StationState Management
1. 2.2 Mobile1State Management
2. Call Drop Mobile1 Idle State MSC Mobile1 Busy State 3. Mobile1 (2~5 , The Mobile you called is busy now .. )
4. MSCMobile StationState Management
2.3 State Management Error after Call Drop
MSC
Mobile1 Mobile2
BTS
ReleaseRelease
Call Drop by Mobile1
InformationMsgAfter Bad Frame Timer
InformationMsgAfter Bad Frame Timer
Mobile1 = BusyMobile2 = Busy
2 M bil St ti St t M t P bl
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2. Mobile Station State Management Problem
1. 2 Spec ial Case Mobile Station
Mobile Station
2. The dialed number is not correct? ? ? , The Mobile you called is busy
now? ? ?
3. MSC
1. 2 Special Case Mobile Station
Mobile Station 2. The dialed number is not correct? ? ? , The Mobile you called is busy
now? ? ?
3. MSC
2.4 Problem of Critical Case
MSC
000-0000-0000Idle State
All Mobile Station= ? (I do not know)
No Page Massage
xxx-xxxx-xxxx
Connect Request
000-0000-0000= ?
Release
Call000-0000-0000
Do not know
000-0000-0000= ?
Release
1.TetminationMobile StationPage Massage Response Bell
1 Switching System Release Order
2.MSC
1.TetminationMobile StationPage Massage Response Bell
1 Switching System Release Order
2.MSC
Case 1)
Case 2)
3 Time Based Registration Problem
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3. Time Based Registration Problem
Time
7.7Minite 7.7Minite 7.7Minite 7.7Minite 7.7Minite
Time Based Registration
Page Massage
Mobile canResponse
Page Massage Mobile cannotResponse
1. Idle State Mobile Station Page Massage Page Response Reg istration
Page Massage Response2. XiamenCDMA Network Mobile Station 7.7Minute Time Based Reg istration
( REG_PRD = 50 ) Access Channel
3. REG_PRD = 60 ~ 64 (62 ~ 87Minute) SKT Value : 64
1. Idle State Mobile StationPage MassagePage ResponseRegistration
Page Massage Response
2. XiamenCDMA Network Mobile Station7.7MinuteTime Based Registration
( REG_PRD = 50 ) Access Channel 3. REG_PRD = 60 ~ 64 (62 ~ 87Minute) SKT Value : 64
4 The Other Problem
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4. The Other Problem
MSCBTS BSCMobileStation BTSBSC
MobileStation
No Paging
Origination
Success
ConnectReq ConnectReq
1. Origination Mobile Station 2 Call Drop ( Fail)
2. Page Massage (2nd Pag ing Time + T imeout Time) No Respons 2 Call Drop Page Massage
3. BTS BSC MSC
1. Origination Mobile Station 2 Call Drop ( Fail)
2. Page Massage (2nd Pag ing Time + T imeout Time) No Respons
2 Call Drop Page Massage
3. BTS BSC MSC
5 General Opinion
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5. General Opinion
1. System CDMA
( Paging Area, 2nd Paging Timing ) RF F ield
2. System Mobile Station State Management Switching System
Critical
3. Paging Area 2nd Paging Timing, Timeout Timing Critical
4.
5. RF Field Factor Field
6. Xiamen Area (MSC, BSC )
1. System CDMA
( Paging Area, 2nd Paging Timing ) RF F ield
2. System Mobile Station State Management Switching System
Critical
3. Paging Area 2nd Paging Timing, Timeout Timing Critical
4.
5. RF F ield Factor Field
6. Xiamen Area (MSC, BSC )