30pt gsm ms in idle & connected mode behavior and pre ...€¦copyright © 2013 huawei...
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Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
47pt
30pt
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FrutigerNext LT Medium
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47pt
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28pt
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GSM MS in Idle &
Connected Mode Behavior
and Pre Optimization
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Idle Mode
2. Handover
3. Location Update
4. Paging Processing
5. Access Processing
6. Other parameters
7. GSM Pre Optimization
Page1
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page 2
• When the MS is switched ON
• When there is no dedicated connection
When?
• To camp on the best suitable cell
Why?
• For MS to receive system info from the NW on DL
• For MS to be able to initiate a call whenever needed
• For the NW to be able to locate the MS when there is a MT
call/SMS
Why to camp on a specific cell?
• PLMN selection
• Cell selection & re-selection
• Location updates
Idle Mode Tasks
Idle Mode Operation
MS switched ON
Search RF channels
to find BCCH carrier
Check that the PLMN
& cell is allowed
MS camps on
the best
suitable cell
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page 3
LAI (locationAreaId)
• NCC (Network Colour Code) 0 … 7
• BCC (BTS Colour Code) 0 … 7
BSIC (bsIdentityCode)
CI (cell-ID 0 … 65535
Parameter
• MCC (Mobile Country Code) 0 … 999
• MNC (Mobile Network Code) 0 … 99,
0… 999 (optional 3-digit MNC)
• LAC (Location Area Code) 1 … 65533
CGI (Cell Global Identity) MCC + MNC + LAC + CI
ID’s and ID Codes
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
cell 1
cell 2
cell 3
C2
time 5 seconds
cell
reselection
5 seconds
CELL_RESELECT_
HYSTERESIS (HYS)
LAC = A LAC = B
cell reselection &
location update
Cell Reselection Based on Pathloss Criterion C2
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Idle Mode
2. Handover
3. Location Update
4. Paging Processing
5. Access Processing
6. Other parameters
7. GSM Pre Optimization
Page5
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page 6
Purpose
★ Movement → Continuity → Cell
★ Interference → Quality → Channel
★ Traffic → Congestion → Border / Layer
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Intra cell
Only other carrier / timeslot
Inter cell
Intra BSC
Inter BSC
Intra MSC
Inter MSC
Inter PLMN
Global Cell ID required
MCC + MNC + LAC + CI
Intra PLMN
Simple Cell ID required
LAC + CI
Handover Types
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page 8
Process
Measurements MS
BTS
DL Level serving cell
DL Quality serving cell
DL Level neighbor cells
UL Level
UL Quality
Timing advance Measurement reporting MS → BTS
MR preprocessing
Penalty processing
Cell Ranking
Handover Judgement
BA2 table
BCCH
BSIC BTS
Module number
cell number
CGI
Adjacent cell Relation Table
Cell Description Table
External Cell Description Table
BSC Target cell list
Handover execution
MS
BTS
BSC
MSC
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Handover Triggering
Serving Cell Neighboring Cell
RX_LEV Thr
Time
RX_Lev
• Edge Handover
Handover
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Idle Mode
2. Handover
3. Location Update
4. Paging Processing
5. Access Processing
6. Other parameters
7. GSM Pre Optimization
Page10
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Definition of Location Update
Inform the system the LA (Location Area) where the MS is located.
Normal location update
Period location update
Attach
LA 1
LA 2
Page11
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page12
Location Area
A location area is a set of base stations that are grouped together
to optimize signaling
Location Area is a group of cells and the subscriber is paged in
this area.
One or more base station controllers are used to serve each
Location Area but by a single MSC.
Each Location Area has a unique Location Area Identity number.
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Idle Mode
2. Handover
3. Location Update
4. Paging Processing
5. Access Processing
6. GSM Pre Optimization
Page13
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Paging
Paging is the one-to-one communication between the mobile
and the base station
Paging is a procedure the network uses to find out a
subscriber’s location before actual call establishment.
Paging is used to alert the mobile station of an incoming call.
Page14
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Paging Strategies
Location Area Splitting in Paging Areas
Mobile registers only when entering the Location Area; it doesn’t
register when moving between Paging Areas of one Location
Area.
For an incoming call, paging messages are broadcasted in the
Paging Areas according to a sequence determined by different
strategies.
Page15
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Location Area Splitting in Paging
Areas
Page16
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Idle Mode
2. Handover
3. Location Update
4. Paging Processing
5. Access Processing
6. GSM Pre Optimization
Page17
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Agenda
Page18
GSM Overview
GSM Overview
GSM Main KPIs
GSM DT Analysis
GSM DT Problems
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM Main KPIs (1/2)
Page19
GSM KPI Analysis
Accessibility Analysis
Mobility Analysis
Retain ability Analysis
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Analysis (2)
DT Output :
Rx Level.
Rx Qual.
C/I.
TA.
Serving Cell. (Cell Name & CGI “MCC, MNC, LAC, CI“)
MOS.
Neighbor Measurements “Rx Level”.
Events (Call Setup Fail, HO Fail, Call Drop).
Page20
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Analysis (3)
Rx Level : Received Signal Level. “0 - -110 dbm”
0- -60 Excellent , -60 - -70 Good , -70 - -80 Average , -80 - -90 Poor , -90 - -110 Worst
Rx Qual : Voice Signal Quality. “0 - 7”
0- 3 Excellent , 3 – 4 Average , 4 - 7 Worst
C/I : Carrier to Interference Ratio. “-5 - 32”
32 - 12 Excellent , 12 – 9 Average , 9 - 5 Poor , 5 - -5 Worst
TA : Timing Advance. “0 - 63” 1 Step Size = 550m.
MOS: Mean opinion score. “1 - 5”
1 Worst , 2 Poor , 3 Average , 4 Good , 5 Excellent
Page21
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Example of KPI (4)
Voice CSSR
Page22
98.6
98.7
98.8
98.9
99
99.1
99.2
99.3
99.4
99.5
99.6
Call Setup Success Rate
Call Setup Success Rate - 2G Voice_NPM
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Example of KPI (2)
Page23
Call Drop Rate
0.38
0.39
0.4
0.41
0.42
0.43
0.44
0.45
0
10000
20000
30000
40000
50000
60000
03/2
0/2
017
03/2
1/2
017
03/2
2/2
017
03/2
3/2
017
03/2
4/2
017
03/2
5/2
017
03/2
6/2
017
03/2
7/2
017
03/2
8/2
017
03/2
9/2
017
03/3
0/2
017
03/3
1/2
017
04
/01/2
017
04
/02/2
017
04
/03/2
017
04
/04
/2017
04
/05/2
017
04
/06
/2017
04
/07/2
017
04
/08/2
017
04
/09/2
017
04
/10/2
017
04
/11/2
017
04
/12/2
017
04
/13/2
017
04
/14
/2017
04
/15/2
017
04
/16
/2017
04
/17/2
017
04
/18/2
017
04
/19/2
017
Call Drop Rate
CM33:Call Drops on Traffic Channel Call Drop Rate (Global)_NPM
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Example of KPI (3)
TCH Congesiton
Page24
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
03/2
0/2
017
03/2
1/2
017
03/2
2/2
017
03/2
3/2
017
03/2
4/2
017
03/2
5/2
017
03/2
6/2
017
03/2
7/2
017
03/2
8/2
017
03/2
9/2
017
03/3
0/2
017
03/3
1/2
017
04
/01/2
017
04
/02/2
017
04
/03/2
017
04
/04
/2017
04
/05/2
017
04
/06
/2017
04
/07/2
017
04
/08/2
017
04
/09/2
017
04
/10/2
017
04
/11/2
017
04
/12/2
017
04
/13/2
017
04
/14
/2017
04
/15/2
017
04
/16
/2017
04
/17/2
017
04
/18/2
017
04
/19/2
017
TCH Congestion Rate
K3011A:Failed TCH Seizures due to Busy TCH (Traffic Channel) TCH Cong Rate_NPM
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Agenda
Page25
GSM Overview
GSM Overview
GSM Main KPIs
GSM DT Analysis
GSM DT Problems
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Problems (1)
Rx Quality Problems :
Poor Coverage.
Missing Neighbor.
Close Frequency Reuse.
HW Problem at the receiver.
Congestion.
Overshooting.
Call Drop :
Poor Coverage.
Bad Quality.
Delayed HO.
Missing Neigbors
Congestion.
HW Problems & Path Balance.
Radio Link Timeout or SACCH Multi-Frame expires.
Power Problem.
Page26
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Problems (2)
Call Setup Fail :
Poor Coverage.
Bad Quality.
HW Problems.
Transmission Problem.
Congestion on SD or TCH.
Page27
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Problems (3)
Overshooting :
Page28
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Problems (4)
Missing Neighbor :
Page29
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GSM DT Problems (5)
Cross “Swapped” Sector :
Page30
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