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7/22/2019 ABIS BTS.pdf
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A-bis Interface
H.R. Shariati
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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)
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Introduction
Introduction
Abis
BTS
MMIMMI
MS
Um
OMC
MMI
TRAU BSC
A Asub
MSC
BSS
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
…
L3 Messages L3 Messages
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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
L3 Messages L3 Messages
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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
L3 Messages L3 Messages
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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
…
L3 Messages L3 Messages
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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
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Manufacture
Dependent
Hardware
Manufacture
Dependent
Hardware
Site
BTS(s)
TRX(s)
Card(s)
BTS ProgrammingBTS Programming
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g g
From BSCBTS Programming
From BSC
TEI Assignment
Fixed
Semi Automatic
Full Automatic
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BTS ProgrammingBTS Programming
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g g
From BSCBTS Programming
From BSC
(TEI Assignment)
B S C
TEI Assigned
Fixed
Semi Automatic
Full Automatic
B T S
TEI RequestTEIOM
TEIOM
BTS ProgrammingBTS Programming
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From BSCBTS Programming
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
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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
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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
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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
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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
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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
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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
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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
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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
AttributesImportant Attributes
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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
AttributesImportant Attributes
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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
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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 )
Recommended