ch-termination call fall reason analysis

7/24/2019 CH-Termination Call Fall Reason Analysis

1/17

XIAMEN CDMA

2002. 01


2/17

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


3/17

1.1 Problem of Paging Area


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


4/17

1.1 Problem of Paging Area (Continued ..)


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


5/17

1.1 Problem of Paging A rea(Continued ..)


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


6/17

1.2 Timing of 2 nd Paging and T imeout Problem

1.2.1 Xiamen CDMA Switching System Page Response Timeout


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


7/17

1.2 Timing of 2 nd Paging and Timeout Problem(Continued ..)

1.2.2 Mobile Station Access Probe


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


8/17


1.2.3 Mobile Station Access Probe


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


9/17

1.2.4 Problem


AccessAttempt

AccessSequence1 AccessSequence2

11.5 Sec

MSC(VLR) BSCBTS

BCP Paging Channel

1st Paging

2ndPaging8Sec

8SecTime Out


.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


10/17

1.2.5


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



11/17


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? ? ?


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


12/17


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


Mobile1 = IdleMobile2 = busy

2 S S


13/17


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 .. )


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 .. )


2.3 State Management Error after Call Drop

MSC

Mobile1 Mobile2

BTS

ReleaseRelease

Call Drop by Mobile1



Mobile1 = BusyMobile2 = Busy

2 M bil St ti St t M t P bl


14/17


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


15/17

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


16/17

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


17/17

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 )

ch-termination call fall reason analysis

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