30pt GSM MS in Idle & Connected Mode Behavior and Pre … · DL Quality serving cell DL Level neighbor cells UL Level UL Quality Measurement reporting MS →BTS Timing advance MR

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47pt

30pt

反白

:

FrutigerNext LT Medium

: Arial

47pt

黑体

28pt

反白

细黑体

GSM MS in Idle &

Connected Mode Behavior

and Pre Optimization


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


35pt

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) :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


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


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) :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


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) :18pt

Contents

1. Idle Mode

2. Handover

3. Location Update



6. Other parameters


Page5


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Page 6

Purpose

★ Movement → Continuity → Cell

★ Interference → Quality → Channel

★ Traffic → Congestion → Border / Layer


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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


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) :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


35pt

32pt

) :18pt

Handover Triggering

Serving Cell Neighboring Cell

RX_LEV Thr

Time

RX_Lev

• Edge Handover

Handover


35pt

32pt

) :18pt

Contents

1. Idle Mode

2. Handover

3. Location Update



6. Other parameters


Page10


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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


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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.


35pt

32pt

) :18pt

Contents

1. Idle Mode

2. Handover

3. Location Update




Page13


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) :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


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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


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Location Area Splitting in Paging

Areas

Page16


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) :18pt

Contents

1. Idle Mode

2. Handover

3. Location Update




Page17


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Agenda

Page18

GSM Overview

GSM Overview

GSM Main KPIs

GSM DT Analysis

GSM DT Problems


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GSM Main KPIs (1/2)

Page19

GSM KPI Analysis

Accessibility Analysis

Mobility Analysis

Retain ability Analysis


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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


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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


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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


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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


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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


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) :18pt

Agenda

Page25

GSM Overview

GSM Overview

GSM Main KPIs

GSM DT Analysis

GSM DT Problems


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) :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


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GSM DT Problems (2)

Call Setup Fail :

Poor Coverage.

Bad Quality.

HW Problems.

Transmission Problem.

Congestion on SD or TCH.

Page27


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) :18pt

GSM DT Problems (3)

Overshooting :

Page28


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GSM DT Problems (4)

Missing Neighbor :

Page29


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GSM DT Problems (5)

Cross “Swapped” Sector :

Page30

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Documents

30pt GSM MS in Idle & Connected Mode Behavior and Pre … · DL Quality serving cell DL Level neighbor cells UL Level UL Quality Measurement reporting MS →BTS Timing advance MR