ABIS BTS.pdf

A-b Abis Inter erfface H.R. Shariati

1

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) 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) 2

Introduction

Introduction Abis OMC

A

Um

Asub

MSC

BSS

TRAU

BSC

BTS

MMI

MMI

MMI

MS

3

E1 Link (Time Slots)

E1 Link

Synchronization Time Slot 0 1

Timing & Sync.

2

Traffic

3

Traffic

Signaling

Signaling

Traffic Time Slot

Traffic Traffic

Signaling Time Slot Signaling 29 30

Traffic Traffic

31

4

E1 Link

E1 Link (Different Implementations) Timing & Sync.

0 1

Signaling (RSL)

2

Traffic

3

Traffic Signaling (RSL) Traffic Traffic

Signaling (RSL) 29 30 31

RSL (64 Kb/s) 1 TRX

7

6 5

4 3 2 1

0

7

6 5

4 3 2 1

0

Traffic Traffic Signaling (OML)

1 User

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

5

E1 Link

E1 Link (Different Implementations, Cont’d) 0 1

Timing & Sync. Traffic

2

8 E1 Time Slots = 4 RX

3 Traffic Signaling (RSL)

RSL (16 Kb/s)

Traffic

Traffic Signaling (RSL)

TRX3

TRX2

TRX1

TRX0

29 30 31

Signaling (OML)

Type 2: Max. TRXs = 13

6

E1 Link (Different Implementations, Cont’d) 0 1

E1 Link

Timing & Sync. Traffic

2 3 Traffic Signaling (OML &RSL)

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

Traffic

Traffic Signaling (OML &RSL)

29 30 31

Type 3: Max. TRXs = 14

7

E1 Link (Different Implementations, Cont’d) 0 1 2 3

Timing & Sync. Signaling Traffic Traffic

E1 Link

RACK1 (k-TRX)

Traffic Signaling Traffic Traffic

RACK2 (m-TRX)

(n,m,k = 1- 6)

Traffic Signaling Traffic Traffic 29 30

RACK3 (n-TRX)

Traffic

31

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

8

Layer 2 & 3

Layer 2 & 3 Protocols

Protocols



Layer 2: Data Link Layer LAPD



Layer 3: Management Layer ¾ L2ML: Abis

Management

¾ OML

: O&M Management

¾ RSL

: Radio Signaling Management

9

Layer 2 & 3 Protocols

Layer 2 & 3 Protocols (Cont’d) Layer 3

Data Link Layer / Layer 3 Primitives

Layer 3 Entity

Peer-to-Peer Protocol Data Link Layer Service Access Point

*

Layer 3 Entity

* Data Link Layer

Data Link Layer Peer-to-Peer Protocol

Entity Data Link Layer / Physical Layer Primitives

Physical Layer Service Access Point

Data Link Layer

Entity

*

*

Physical Layer

Physical Layer

Entity

Entity

Physical Connection

10

L3 Messages Between BTS & BSC 

OML, L2ML

L3 Messages

: for BTS Programming (Data Base Down Load)



RSL Messages: for Communicating of MS and Network (Between BTS & BSC)



Important Parameters

11

L3 Messages

L3 Messages

Identity Request (TEI = OML TEI = Fixed or Not Fixed) Identity Check Request (2) Identity Assigned C S B

Stop Sending Event Report

S T B

ACK Get Attributes (BTS Site Manager)

12

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 C S B

S T B

Load Data Initiate ACK Load Data Segment

… ACK …

Window Size

13


L3 Messages

Load Data End ACK SW Activate Request SW Activate C S B

ACK SW Activate Report

S T B

Begin DB Transmission ACK

14


L3 Messages

Set BTS Attributes ACK Set Attributes

C S B

Power Control ACK Hand Over Adjacent Cell Hand Over S Set TRX Attributes T ACK

B

Establish TEI ACK

15


L3 Messages

Identity Request Identity Check Request Identity Assignment Set Channel Attributes C S B

ACK Connect Terrestrial Traffic

S T B

ACK

…

End DB Transmission ACK

16


L3 Messages

Reset Resources ACK Changed State Event Report (Enabled) per TRX C S B

BCCH (System Info. Type 1-4) SACCH (System Info. Type 5,6)

S T B

Get ACK Changed State Event Report BTS and TRX Enabled and Unlocked 17

Manufacture Dependent Hardware

Manufacture Dependent Hardware

Site

BTS(s)

TRX(s)

Card(s) 18

BTS Programming From BSC


TEI Assignment 

Fixed



Semi Automatic



Full Automatic

19

BTS Programming From BSC (TEI Assignment)



Fixed



Semi Automatic



Full Automatic

TEI Fixed

C S B

SABME


STEI T BFixed

20




Fixed



Semi Automatic

OM



Full Automatic

TEI


OM C S B

TEI Request TEI Assigned

S T B

TEI

21




Fixed



Semi Automatic



Full Automatic


Random TEI Request

C S B

If Not Used: Assign

…

TEI Request

S T B

TEI Assigned

22

Call Establishment

Call Establishment Paging Command

PCH RACCH

Channel required Channel Activation (SDCCH[4]/3, TN=0) C S Channel Activation ACK. B

Immediate Assignment

S T B

S M

AGCH SABM Establish Indication (SDCCH[4]/3, TN=0)

UA

23

Call Establishment (Cont’d)

Call Establishment

MS RF Power Capability Indication Encryption Command

Measurement Result (if ON)

C S Ciphering Mode Complete B

Encryption Command SACCH SCiphering Mode Complete T B

S M

Identity Request Identity Request Set Up

Set Up

24

Call Establishment (Cont’d) Call Proceeding

Call Establishment

Call Proceeding

Physical Context Confirm Physical Context Confirm ACK Channel Activation (BM + ACCH, TN=1)

C S B Channel Activation ACK

S T B

S M

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

25


Call Establishment

Identity Response

Identity Response

SABM (FACCH) Establish Indication (BM + ACCH, TN=1) C S B

Assignment Complete

UA (FACCH) Assignment Complete (FACCH) S T B

S M

MS RF Power Capability Indication Release Request (SDCCH[4]/3, TN=0)

Release Request 26


Call Establishment

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

Release Confirm (SDCCH[4]/3, TN=0) RF Channel Release (SDCCH[4]/3, TN=0) C S B

RF Channel Release ACK TMSI Reallocation Command TMSI Reallocation Complete

S T B

TMSI Reallocation Complete

S M

SACCH Measurement Result (if ON) 27


Call Establishment

Intercell HO Condition Indication (if HO Req.) Alerting Connect Connect ACK

C S T S Measurement Result (if ON) B B

Alerting Connect Connect ACK SACCH

S M

Release (BM + ACCH, TN=1) Release Release Complete (BM + ACCH, TN=1)

Release Complete

28


Call Establishment

Deactive SACCH (BM + ACCH, TN=1) DISC Release Indication (BM + ACCH, TN=1) C RF Channel Release S B RF Channel Release ACK

UA S T B

S M

(BM + ACCH, TN=1)

29

Important Attributes (Parameters)



Important Attributes

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

Code ¾ BS-Color Code     

BCCH ARFCN RACH Busy Threshold NY1 Enable Interference Class & Boundaries & Period T200: SDCCH-FACCH-SACCH 30

Important Attributes (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 31

Important Attributes (Parameters) (Cont’d)  


Hand Over Reconfiguration Adjacent Cell Hand Over Definition: BSICBCCH ARFCN-Cell ID



TRX Attr. :ARFCN-RF Max Power Reduction



Chan. Attr.:Channel Combination-HSNMAIO-TSC

32

ABIS BTS.pdf

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