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|  B  |  Bc  |  Bcp  |  Bi  |  Bl  |  Bm  |  Bmb  |  Bmn  |  Bo  |  Bp  |  Bpr  |  Bs  |  Bsm  |  Bt  |  Bw  |  Bx  |



between  MSC
and  VLR

see it   here

specified from  GSM Phase 2  in
TS 09.02, clause 4.4.3 

The VLR is the location and management data base for the MSs roaming in the area controlled by the associated MSC(s). Whenever the MSC needs data related to a given MS currently located in its area, it interrogates the VLR. When a MS initiates a location updating procedure with an MSC, the MSC informs its VLR which stores the relevant information in its tables. This procedure occurs whenever a mobile roams to another location area. Also, for instance when a subscriber activates a specific supplementary service or modifies some data attached to a service, the MSC transfers (via the VLR) the request to the HLR, which stores these modifications and updates the VLR if required. However, this interface is not fully operational specified. It is strongly recommended not to implement the B-interface as an external interface.

Messages on the B-interface are defined in TS 23.018, clause 8.1.

Bx   (file transfer)


between  CGF
and  BD

see it   here

specified from  Rel-6  in
TS 32.297, clause 4 

"Bx" is a common designator for the reference points from the network to the Billing Domain (BD) that are intended for the transport of CDR files.
The letter "x" indicates the different 3GPP network domain, subsystem or service, thus:
Bc  represents Circuit Switched (CS) in TS 32.250, clause 6.1.3
Bcp  represents Control Plane data transfer in TS 32.253, clause 6.1.3
Bi  represents IP Multimedia Subsystem (IMS) in TS 32.260, clause 6.1.3
Bl  represents Location Service (LCS) in TS 32.271, clause 6.1.3
Bm  represents Multimedia Messaging Service (MMS) in TS 32.270, clause 6.1
Bmb  represents Multimedia Broadcast/Multicast Service (MBMS) in TS 32.273, clause 6.1.3
Bmn  represents Monitoring Event in TS 32.278, clause 6.1.3
Bo  represents Online Charging System (OCS) in TS 32.296, clause 7.2
Bp  represents Packet Switched (PS) in TS 32.251, clause 6.1B
Bpr  represents Proximity-based Services (ProSe) in TS 32.277, clause 6.1.3
Bs  represents CAMEL SCF in TS 23.078
Bsm  represents Short Message Service (SMS) in TS 32.274, clause 6.1.3
Bt  represents Push-to-talk over Cellular service (PoC) in TS 32.272, clause 6.1.3
Bw  represents Wireless LAN (WLAN) in TS 32.252, clause 6.1.3

By definition, dealing with CDR files only implies that Bx is solely related to offline charging. The CGF in each network domain, service or subsystem is relevant for the network side of the Bx reference point and is connected with the Billing Domain that forms the receiving end of the Bx reference point. Further details of the Billing Domain, i.e. beyond terminating Bx, are outside the scope of 3GPP standardization.

Note that the OCS can also generate CDRs and transfer them to the BD across the Bo reference point. Furthermore the GSM SCF, defined in CAMEL, can also generate CDRs and transfer them to the BD across the Bs reference point