abis bts.pdf

7/22/2019 ABIS BTS.pdf

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1

A-bis Interface

H.R. Shariati



2

Structure of the Talk

Introduction E1-Link

Layer 2 & 3 Protocols

L3 Massages Manufacture Dependent Hardware

BTS Programming From BSC

Call establishment

Important Attributes

BSC Programming ( Data Base)



3

Introduction

Introduction

Abis

BTS

MMIMMI

MS

Um

OMC

MMI

TRAU BSC

A Asub

MSC

BSS



4

E1 LinkE1 Link

(Time Slots)

Timing & Sync.

Signaling

Traffic

Traffic

Signaling

Traffic

Traffic

Traffic

Traffic

Signaling

Traffic Time Slot

Synchronization Time Slot

0

1

3

2

Signaling Time Slot

30

29

31



5

E1 Link

(Different

Implementations)

E1 Link

2

30

29

31

0

1

3

Timing & Sync.

Signaling (RSL)

Traffic

Traffic

Signaling (RSL)

Traffic

Traffic

Traffic

TrafficSignaling (RSL)

Signaling (OML)

1 TRX

RSL (64 Kb/s)

7 6 45 13 2 0

7 6 45 13 2 0

1 User Type 1: Max. TRXs = 30 / 3 = 10



6

E1 LinkE1 Link

(Different

Implementations, Cont’d)0

1

Timing & Sync.

3

2

30

29

31 Signaling (OML)

Signaling (RSL)

Traffic

Traffic

RSL (16 Kb/s)Signaling (RSL)

Traffic

Traffic

8 E1 Time Slots = 4 RX

TRX0TRX3 TRX2 TRX1

Type 2: Max. TRXs = 13



7

E1 LinkE1 Link

(Different

Implementations, Cont’d)0

1

Timing & Sync.

3

2

30

29

31

Signaling (OML &RSL)

Traffic

Traffic

Signaling (OML &RSL)

Traffic

Traffic

2n E1 Time Slots = n TRX(n= 1- 6)

(OML & RSL)

Type 3: Max. TRXs = 14

E1 Li k



8

E1 LinkE1 Link

(Different

Implementations, Cont’d)Timing & Sync.

Signaling

Traffic

Traffic

Traffic

Signaling

Traffic

Traffic

Traffic

Traffic

Traffic

Signaling

Traffic

RACK1(k-TRX)

RACK2

(m-TRX)

RACK3

(n-TRX)

0

1

3

2

(n,m,k = 1- 6)

30

29

31

Type 4: Max. TRXs = 14, Recommended by MCT

L 2 & 3



9

Layer 2 & 3

ProtocolsLayer 2 & 3

Protocols

Layer 2: Data Link Layer

LAPD

Layer 3: Management Layer

¾L2ML: Abis Management

¾OML : O&M Management

¾RSL : Radio Signaling Management

L 2 & 3



10

Layer 2 & 3

ProtocolsLayer 2 & 3

Protocols

(Cont’d)

Layer 3

Entity

Layer 3

Entity

* *

*

Data Link Layer

Entity

*

Physical Layer

Entity

Physical Layer

Service Access Point

Data Link Layer

Service Access Point

Layer 3Peer-to-Peer Protocol

Data Link Layer /

Layer 3

Primitives

Data Link Layer

Entity

Peer-to-Peer ProtocolData Link Layer

Data Link Layer /Physical Layer

Primitives

Physical Layer

EntityPhysical Connection

L3 M L3 Messages



11

L3 Messages

Between

BTS & BSC

L3 Messages

OML, L2ML : for BTS Programming

(Data Base Down Load)

RSL Messages: for Communicating of MS

and Network

(Between BTS & BSC)

Important Parameters

L3 Messages



12

L3 Messages

L3 Messages

Identity Request

(TEI = OML TEI = Fixed or Not Fixed)

Identity Check Request (2)

Identity Assigned

B S C

B T SStop Sending Event Report

ACK

Get Attributes (BTS Site Manager)

L3 Messages L3 Messages



13

L3 Messages

(Cont’d)

L3 Messages

ACK (Software Version)

(TEI = OML TEI = Fixed or Not Fixed)

If : SW version == Correct

Begin DB Down Load

Else : Start SW Down Load

B S C

B T SLoad Data Initiate

ACK

WindowSize

ACK…

Load Data Segment

…




14

L3 Messages

(Cont’d)

L3 Messages

Load Data End

ACK

SW Activate Request

SW Activate

B S C

B T SACK

SW Activate Report

Begin DB Transmission

ACK




15

L3 Messages

(Cont’d)

L3 Messages

Set TRX Attributes

ACK

Adjacent Cell Hand Over

Set BTS Attributes

ACK

B S C

B T S

ACK

Set AttributesPower Control

Hand Over

Establish TEIACK




16

L3 Messages

(Cont’d)

L3 Messages

Identity Request

Identity Check Request

Identity Assignment

Set Channel Attributes

ACK

B S C

B T S

End DB Transmission

ACK

Connect Terrestrial Traffic

ACK

…




17

L3 Messages

(Cont’d)

L3 Messages

Reset Resources

ACK

Changed State Event Report

(Enabled) per TRX

BCCH (System Info. Type 1-4)

B S C

B T S

Get

ACK

SACCH (System Info. Type 5,6)

Changed State Event Report

BTS and TRX Enabled and Unlocked

ManufactureManufacture



18

Manufacture

Dependent

Hardware

Manufacture

Dependent

Hardware

Site

BTS(s)

TRX(s)

Card(s)

BTS ProgrammingBTS Programming



19

g g

From BSCBTS Programming

From BSC

TEI Assignment

Fixed

Semi Automatic

Full Automatic



21

g g


From BSC

(TEI Assignment)

B S C

TEI Assigned

Fixed

Semi Automatic

Full Automatic

B T S

TEI RequestTEIOM

TEIOM




22


From BSC

(TEI Assignment)

Random

TEI Request Fixed

Semi Automatic

Full AutomaticIf Not Used:Assign

…TEI Request B

S C

B T S

TEI Assigned

CallCall



23

EstablishmentCall

Establishment

B S C

B T SChannel Activation ACK.

Immediate AssignmentAGCH

SABM

UAEstablish Indication

(SDCCH[4]/3, TN=0)

Paging CommandPCH

RACCHChannel required

Channel Activation

(SDCCH[4]/3, TN=0)

M S

Call Call



24

Establishment

(Cont’d)

Establishment

MS RF Power

Capability Indication

B S C

B T S

SACCHMeasurement Result (if ON)

Identity Request

Identity Request

Ciphering Mode CompleteCiphering Mode Complete

Set UpSet Up

M S

Encryption CommandEncryption Command

Call Call



25

Establishment

(Cont’d)

Establishment

Call ProceedingCall Proceeding

B S C

B T S

Channel Activation

(BM + ACCH, TN=1)

Channel Activation ACK

Assignment Command

(SDCCH[4]/3, TN=0)

Assignment Command

Physical Context Confirm

Physical Context Confirm

ACK

M S

Call Call



26

Establishment

(Cont’d)

Establishment

Identity Response

B S C

B T S

Release Request

(SDCCH[4]/3, TN=0)

UA (FACCH)Establish Indication

(BM + ACCH, TN=1)Assignment Complete

(FACCH)Assignment Complete

MS RF Power

Capability Indication

Release Request

Identity Response

SABM (FACCH)

M S

Call Call



27

Establishment

(Cont’d)

Establishment

Release Confirm

(SDCCH[4]/3, TN=0)Release Confirm

(SDCCH[4]/3, TN=0)

B S C

B T STMSI Reallocation

Command

RF Channel Release ACK

TMSI Reallocation

Complete

Measurement Result (if ON)

RF Channel Release

(SDCCH[4]/3, TN=0)

M S

TMSI Reallocation

Complete

SACCH

Call Call



28

Establishment

(Cont’d)

Establishment

Intercell HO Condition

Indication (if HO Req.)

B S C

B T S

Connect ACK Connect ACK

SACCHMeasurement Result (if ON)

Release

(BM + ACCH, TN=1) Release

Release CompleteRelease Complete

(BM + ACCH, TN=1)

M S

Alerting AlertingConnect

Connect

Call Call



29

Establishment

(Cont’d)

Establishment

UA

Deactive SACCH

(BM + ACCH, TN=1)DISC

Release Indication

(BM + ACCH, TN=1)

B S C

B T S

RF Channel Release ACK

(BM + ACCH, TN=1)

RF Channel Release M S

Important

AttributesImportant Attributes



30

Attributesp

(Parameters)

BSIC (Base Station Identity Code):¾PLMN-Color Code

¾BS-Color Code

BCCH ARFCN

RACH Busy Threshold

NY1

Enable Interference Class & Boundaries &Period

T200: SDCCH-FACCH-SACCH

Important




31

Attributesp

(Parameters)

(Cont’d)

MS Tx Pwr Max

BTS Is Hopping

Enable Internal Intercell Handover

Enable Internal Intracell Handover Enable RXQual & RXLevel Handover (with

Threshold & Periods)

Enable MS Power Control with Reduction &Increment Step Sizes and Also Periods &Thresholds

Important




32

Attributesp

(Parameters)

(Cont’d)

Hand Over Reconfiguration

Adjacent Cell Hand Over Definition: BSIC-

BCCH ARFCN-Cell ID

TRX Attr. :ARFCN-RF Max Power Reduction Chan. Attr.:Channel Combination-HSN-

MAIO-TSC

BSC P i



33

BSC Programming

( Data Base)

Tei , Signaling Time slot and Software Version

( LPDLM, BTSM, BTSMN, BTSR – Create BTS )

Set BTS, Set HAND, Set PWRC, Create ADJC

Create LPDLR ( Abis Channel)

Create TRX: Frequency,Power Reduce

Mapping Between Air Time Slots and E1 Time Slots ( Create

Channels )

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