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1 Nokia Siemens Networks Presentation / Author / Date / Document Number
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Bearer Independent Call Control - BICCSwitching Core Network Signalling
M14/U4
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2 Nokia Siemens Networks Presentation / Author / Date / Document Number
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Nokia Siemens Networks Academy
Legal notice
Intellectual Property Rights
All copyrights and intellectual property rights for Nokia Siemens Networks trainingdocumentation, product documentation and slide presentation material, all of which are forthwithknown as Nokia Siemens Networks training material, are the exclusive property of NokiaSiemens Networks. Nokia Siemens Networks owns the rights to copying, modification,translation, adaptation or derivatives including any improvements or developments. Nokia
Siemens Networks has the sole right to copy, distribute, amend, modify, develop, license,sublicense, sell, transfer and assign the Nokia Siemens Networks training material. Individualscan use the Nokia Siemens Networks training material for their own personal self-developmentonly, those same individuals cannot subsequently pass on that same Intellectual Property toothers without the prior written agreement of Nokia Siemens Networks. The Nokia SiemensNetworks training material cannot be used outside of an agreed Nokia Siemens Networkstraining session for development of groups without the prior written agreement of NokiaSiemens Networks.
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Document change history
Date Version Name Change comment
March 3, 08 1 Pubate Satienpoch Revised and update from M13 to M14/U4
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4 Nokia Siemens Networks Presentation / Author / Date / Document Number
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Bearer Independent Call Control - BICC
- BICC is call control protocol designed to transport call control signalling information,
independent of- used bearer technology (e.g. IP, ATM)
- signalling message transport technology (e.g. MTP, MTP3b, SIGTRAN)
- Separate set of procedure for call control signalling and bearer control signalling- Call Control Signalling : BICC (based on ISUP)
- Bearer Control Signalling : e.g. AAL2SIG, IPBCP
BICC
MTP3 MTP3b M3UA
MTP2 SAAL SCTP
MTP1 ATM IP
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BICC functional block
CSF
BCF
Call Control
Signalling
Call Control
Signalling
Bearer Control
Signalling
Bearer Control
SignallingBIWF
Bearer
SN
Call Bearer Control
Signalling (CBC)
CSF
BCF
Call Control
Signalling
Call Control
Signalling
Bearer Control
Signalling
Bearer Control
SignallingBIWF
SN
Call Bearer Control
Signalling (CBC)
CSF
CMN
Bearer
SN : Serving Node Call Service Function (CSF) with associated Bearer Control Function (BCF)
CMN : Call Mediation Node CSF without associated BCF
BIWF : Bearer Inter-working Function, provides BCF and media mapping/switching function
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6 Nokia Siemens Networks Presentation / Author / Date / Document Number
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BICC in 3GPP R4
In 3GPP Rel. 4, the user plane (bearer) and the control plane (signalling andcall control) are separated.
MGW takes care of the user plane and MSS controls it. BICC is to be implemented at Nc interface between MSC servers and MSS-
GCS
CBC (Call Bearer Control) signalling is implemented at Mc interface betweenMSC server and MGW.
MSCServer
H.248IP
MSCServer/ GCS
Mc
MGW
Nc
AAL2/AAL5ATM Nb
Mc
SigtranIP
BICC CS-2IP
MGWRTPIP
SigtranIP H.248
IP
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The vertical interface MGW-MSS (Mc in 3GPP) uses H.248 to convey the
bearer-related information. The needed bearer-information is transferred between MSSs in BICC throughAPM-mechanism
MGWMGW
MSC ServerMSC Server
IP
SCTP
M3UA
BICC
IAM
Sigtran
.
.IP address: 192.168.3.2Port: 5964
Codec: AMR mode 7...
Bearer informationcarried insignalling messages
Bearer cntr Bearer cntr
192.168.3.2/5964
BICC in 3GPP R4
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Two ways to establish a bearer
1) Use separate bearer control signalling (ATM)
2) Tunnel bearer information in call control messages (IP)
Bearer Control Signalling
MSS MSSCall Control Signalling
BICC or SIP
AAL2 signalling
In IP backbone, no separatebearer signalling is used. Theinformation about the bearer istunneled in H.248 and SIP orBICC via the MSC Servers.
IPBCP is used.
H.248
In ATM backbone, bearer isestablished via separate bearer
control signalling. AAL2signalling is used.
H.248
MGW MGW
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Bearer Establishment
Different alternatives for bearer establishment between MGWs are,
(Tunneled) Fast Forward setup [IP] (Tunneled) Delayed Forward setup [IP]
(Tunneled) Delayed Backward setup [IP]
(Non-tunneled) Per-call bearer setup in forward direction [ATM]
(Non-tunneled) Per-call bearer setup in backward direction [ATM]
Originating node always selects the bearer establishment method as well as theused bearer characteristics (BNC-char)
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Bearer Establishment Modes - Non tunneled
Initial setup message
Bearer establishment direction
MSS MSS
Forward
Separate bearercontrol
protocol used(AAL2 signalling)
Initial setup message
Bearer establishment direction
Backward
MSS
MGW
MSS
MGW
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Bearer Establishment Modes - tunneled
No separate bearer control
protocol used
Initial setup message(Bearer Control Information)
MSS MSS
Fast setup
Delayedforward
Subsequent setup message
(Bearer Control Information)
MSS MSS
Response
Initial setup message
Used e.g. when codec isnot known beforehand.
MGW MGW
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Bearer Establishment Modes - tunneled
Response(Bearer Control Information)
MSS MSS
Delayedbackward
Initial setup message
MGW MGW
No separate bearer controlprotocol used
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BICC call control related messages
Message Code Description
ACM 0000 0110 Address Complete Message
ANM 0000 1001 Answer Message
APM 0100 0001 Application Transport Message
COT 0000 0101 Continuity
CPG 0010 1100 Call Progress
CON 0000 0111 Connect
IDR 0011 0110 Identification Request
IRS 0011 0111 Identification Response
INF 0000 0100 Information
INR 0000 0011 Information Request
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BICC Maintenance related messages
Message Code Description
CGB 0001 1000 Circuit / CIC Group Blocking
CGBA 0001 1010 Circuit / CIC Group Blocking Acknowledgement
GRS 0001 0111 Circuit / CIC Group Reset
GRA 0010 1001 Circuit / CIC Group Reset Acknowledgement
CGU 0001 1001 Circuit / CIC Group Unblocking
CGUA 0001 1011 Circuit / CIC Group UnblockingAcknowledgement
CQM 0010 1010 Circuit / CIC Group Query Message
CQR 0010 1011 Circuit / CIC Group Query Response
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BICC Maintenance related messages
Message Code Description
CFN 0010 1111 Confusion
FAA 0010 0000 Facility Accepted
FAC 0011 0011 Facility
FRJ 0010 0001 Facility Reject
FAR 0001 1111 Facility Request
RSC 0001 0010 Reset Circuit / CIC message
UCIC 0010 1110 Unequipped Circuit Identification Code
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General BICC PDU format (ASN1)
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Format of BICC message
Formats and codes for BICC protocols are specified in ITU-T Q.1902.3
They are very much similar to ISUP.
BICC message (BICC PDU)
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CIC (Call Instance Code)
CIC in the BICC protocol is used to identify signalling relation between peer BICC
entities and associate all the PDUs to that relation. Bilateral agreement is required with regard to the CIC values provisioned.
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Application Transport Mechanism - APM
Allows applications to send application specific data between nodes using call
control messages Specified for BICC use in ITU-T Q.765.5
An application is running in the node besides call control instance
Application specific data may be sent in CC messages, or, if none is available, asa separate APM message.
Application specific data is send using APP (Application Transport Parameter)
appl
CC
appl
CC
CC message + application data
Application data
CC message + application data
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APM Functionality in Rel. 4
The application using APM for bearer control is called Bearer AssociationTransport - Application Service Element (BAT-ASE)
APM for BICC defines among others Action indicator (forward/backward)
BNC ID (reference used to associate the bearer with a call)
BIWF address (MGW address)
Codec(s)
Tunneling related information (used/not used, bearer control payload) Carried in APP parameter
MSS
IAMAPPpara
mparam
E.g. IAM or APMmessage
BAT-ASE
MSS
BAT-ASE
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Application Transport Parameter (APP)
Q.765.5
Q.1902.3
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List of identifiers
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Contents of identifiers
Action indicator
It can have codes like connect forward, connect backward etc.
Backbone network connection identifier
The content is bearer specific with maximum length of 4 octets (BNC_ID).
Interworking function address
Interworking function address is in NSAP format (BIWF Address).
Codec list
In the codec list, single codec information elements are listed in decreasing order of preference level.
Single codec
Single codec information element has a field called Organization identifier and codec information subfield.Subfield has information about the codec type and codec configuration.
Bearer Network Connection Characteristics
Codes here identifies the bearer used e.g. IP/RTP, AAL2, TDM etc.
Bearer control information
It contains PDU (Protocol Data Unit) of BCTP.
Bearer control tunnelling
It indicates whether tunnelling is used or not .
Bearer control unit identifier
It contains information about the BCU. It includes Network ID and Local BCU-ID.
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Action Indicator : used for a lot of categories ofindication Bearer Setup Control, for example
no indication
connect backward connect forward connect forward, no notification connect forward plus notification required
Bearer Setup Indication, for example connected
Codec Selection and Modification, for example selected codec modify codec successful codec modification codec modification failure mid-call codec negotiation
DTMF Interaction, for example start signal, notify start signal, no notify stop signal, notify stop signal, no notify
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Codec list
0x00 no indication
0x01 ITU-T
0x02 ETSI
Single codec IE
Single codec IE
Single codec IE
CODEC LIST
Organization Identifier
Single Codec IE
Codec type (codec ID)
Codec configuration
ITU-T ETSI
0x00 No indication 0x00 GSM FR
0x01 G.711 (64 kbps, A-law) 0x01 GSM HR
0x02 G.711 (64 kbps, u-law) 0x02 GSM EFR
0x03 GSM FR AMR
0x04 GSM HR AMR
0x05 UMTS AMR
0x06 UMTS AMR2
Organization ID Codec Type (Codec ID)
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BCTP Bearer Control Tunnelling Protocol
The BICC bearer control tunnelling protocol (BCTP) is a generic tunnelling
mechanism for the purpose of tunnelling bearer control protocols (BCP) over thehorizontal BICC interface between call control units (CCUs) and the vertical callbearer control protocol (CBC) interface between CCU and bearer control unit(BCU).
BCTP is defined in ITU-T Q.1990
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IPBCP IP Bearer Control Protocol
IPBCP is used for the exchange of media stream characteristics, port numbers and IPaddresses of the source and sink of a media stream to establish and allow the modifications
of IP bearers.
IPBCP uses the Session Description Protocol (SDP) defined in RFC 2327 to encode theinformation.
IPBCP uses four messages to convey information between peers
Request It is sent by a BIWF to initiate an IP bearer establishment or modificationrequest.
Accepted It is sent by a BIWF that receives an IP bearer establishment ormodification message if it accepts the request.
Confused It is sent by a BIWF in response to an IP bearer establishment ormodification message if it cannot process the received message.
Rejected- It is sent by a BIWF in response to an IP bearer establishment or
modification message if it rejects the request
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IPBCP
Each IPBCP message consists of following SDP fields:
Session and time description fields1. Protocol version (v)
2. Origin (o)
3. Session name (s)
4. Connection data (c)
5. Time (t)6. Session attribute (a)
Media description fields1. Media announcement (m)
2. Media attribute
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IPBCP in SDP format
Example content of IPBCP is shown in the figure
v= 0
o= - 0 0 IN IP4 10.33.16.136s= IP Tunnelingc= IN IP4 10.33.16.136t= 0 0a= ipbcp:1 Requestm= audio 1026 RTP/AVP 96a= rtpmap: 96 VND.3GPP.IUFP/16000
IPBCPSDP version (v) : 0
Owner/Creator, Session ID (o) :
Owner Username : -
Session ID : 0
Session Version : 0
Owner Network Type : IN
Owner Address Type : IPv4
Owner Address : 10.33.16.136
Session name (s): IP Tunneling
Connection Information (c):
Connection Network Type : IN
Connection Address Type : IPv4
Connection Address : 10.33.16.136
Time Description, active time (t) :
Session Start Time : 0
Session Stop Time : 0
Session Attribute (a) :
Session Attribute Fieldname : ipbcp
IPBCP protocol version : 1
IPBCP command type : Request
Media Description, name and address (m):
Media Type : audio
Media Port : 1026
Media Proto: RTP/AVP
Media Format : 96
Media Attribute (a) :
Media Attribute Fieldname : rtpmap
Media Format : 96
MIME Type : VND.3GPP.IUFP
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Codec Selection : Tandem Free Operation (TFO) vsTrancoder Free Operation (TrFO)
- TFO
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Codec Selection : Tandem Free Operation (TFO) vsTrancoder Free Operation (TrFO)
- TrFO : Codec negotiation using BICC APP parameter
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Successful BICC codec negotiation