2. What is Base Station Controller (BSC) A base station controller (BSC) is a critical mobile network component that controls one or more base transceiver stations (BTS), also known as base stations or cell sites. Key BSC functions include radio network management (such as radio frequency control), BTS handover management and call setup. What is Base transceiver stations (BTS) A base transceiver station (BTS) is a piece of network equipment that facilitates wireless communication between a device and network. A BTS consists of the following: Antennas that relay radio messages Transceivers,Duplexers,Amplifiers A BTS is also known as a base station (BS), radio base station (RBS) or node B (eNB). Base transceiver stations BBU3900 Base Station Controller (BSC 6910)

3. Subrack In compliance with the IEC60297 standard, the BSC6910 subrack has a standard width of 19 inches. The height of each subrack is 12 U. A backplane is positioned in the center of a subrack, with boards on the front and rear sides of the backplane. Front view Subrack Rear view Subrack (1)Fan assembly (2)Board configure d on the front side (3)Power entry module (PEM (4)PAMU(PA RCb) (5)Board configure d on the rear side (6)Ground screw Functions of the PEM Provides power supply, surge protection, and filtering Monitors the input power and input voltage of a subrack Monitors the status of air circuits and of surge protection circuits PEM There are two types of PEM: PEM and PEMa. They can both be called PEM. Only the rated current and power are different: 80 A and 6400 W for PEM; 60 A and 6400 W for PEMa.

4. Slots in a Subrack backplane is positioned in the center of a subrack, and boards are installed on the front and rear sides of the backplane. Each slot provides a different switching bandwidth. A board must be configured in a slot with sufficient bandwidth. Each subrack provides a total of 28 slots. The 14 slots on the front side of the backplane are numbered from 0 Upto 13, and those on the rear side from 14 to 28. Two adjacent slots, such as slots 00 and 01 or slots 02 and 03, can be configured as a pair of active and standby slots. But actual Dessie bsc Is not configured A pair of active and standby boards must be installed in a pair of active and standby slots. DESSIE BSC 1 and BSC 2 A/S Bored is EOMUA,EGPUa Physical Bored But Function RMP,GCUA,GOUC,SCUB all this card is working A/S The pair of active and standby boards installed in the active and standby slots must be of the same type. For example, if slots 14 is configured with GCUa board, slots 15 must be configured with GCUa board. Different types of boards can be installed in non-active and standby slots. For example, if the GCUa board is installed in slot 15, the GOUC board can be installed in slot 16 BSC1 S.N 0 FRONT SIDE =S 0,1,2, No have Bored 3-7 EGPUA, 8 s 9 A EGPUA RMP 10/11 EMOUa ACTIVE 12/13 Standby BSC1 S.N 0 REAR SIDE =14 A,15S GCUa,16A,17S,18A,19S GOUC and 20A,21S SCUB 22A 23S 24A 25S GOU 26& 27 FREE BSC1 S.N 1 FRONT SIDE =5,6,7,8,9 EGPUA Others FREE BSC1 S.N 1 REAR SIDE =16A,17S,18A,19S,22A,23S GOUC 20A,21S SCUB

5. Components of Sub rack *The main components of a sub rack are the fan assembly, slots, and backplane Based on functions, subracks are classified into the main processing subrack (MPS), extended processing subrack ( EPS ). As the main processing subrack, the MPS is configured in the MPR. Only one MPS is configured in the BSC6910. The MPS processes the basic services of the BSC6910, performs operation and maintenance, and provides clock signals for the system. As the extended processing subrack, the EPS is configured in the MPR or EPR. It processes the basic services of the BSC6910 (1)Power unit of the fan assembly (2) Captive screw (3) Handle of the fan assembly (4) Indicator on the fan assembly Technical specifications of the fan assembly ItemSpecifications Height of the space1 U (1 U = 44.45 mm) Voltage-40 V DC to -57 V DC Maximum power700 W Temperature required for the long-term operation 0°C to 45°C Temperature required for the short-term operation -5°C to 55°C Fan speed adjustment rangeThe speed of the fans can be adjusted from 28% to 100% of the full speed.

6. BSC 1EPS BSC 1 MPS BSC 2EPS BSC 1 MPS

7. BSC 1 S.N.1 Front side BSC 1 S.N.0 Front side BSC 1 S.N.0 Rear side BSC 1 S.N.1 Rear side BSC RACK 1

8. AbbreviationFull NameQuantityFunction MPS main processing subrack DESSIE BSC 2 MPS BSC1&2 Performs centralized switching. Provides service paths for other subracks. Provides the service processing interface, system operation management interface, and system clock interface. EPS extended processing subrack DESSIE BSC 2 EPS BSC1&2 Processes the user plane and control signaling. FRONT SIDE SUBRACK REAR SIDE SUBRACK BACKPLIAN SUBRACK SUBRACKDESSIE BSC1 Bored DESSIE BSC2 Bored DESSIE RNC Bored 0 FRONT SIDE7 EGPUa and 2 EOMUa 8 EGPUa and 2 EOMUa 0 REAR SIDE2GCUa,8GOU c,2SCUb 2GCUa,8EXO Ua,2SCUb,EGPUa1 1 FRONT SIDE5 EGPUA4 EGPUA14 EGPUa 1 REAR SIDE6 GOUc,2 SCUb 4 GOUc,2 SCUbEXOUa2,SCU b2

9. BSC2 S.N 0 FRONT SIDE =S 0,1,2, Free 3-7 EGPUA, 8 s 9 A EGPUA RMP 10/11 EMOUa ACTIVE 12/13 Standby BSC2 S.N 0 REAR SIDE =14 A,15S GCUa,16A,17S,18A,19S GOUC and 20A,21S SCUB 22A 23S 24A 25S GOU 26& 27 FREE BSC2 S.N 1 FRONT SIDE =0-5 free,6,7,8,9 EGPUA BSC2 S.N 1 REAR SIDE =14,15,16,17 free 18A,19S,22A,23S GOUC 20A,21S SCUB DESSIE BSC 2 DESSIE BSC 1 1 4 5 3 2

10. Board NameFull NameFunction 1.EGPUa Evolved General Processing Unit REV:a Manages user-plane and control-plane resource pools. Processes user-plane and control-plane services for the BSC and RNC. When used for NIU's logical functions, 2.EOMUa Evolved Operation and Maintenance Unit REV:a Performs configuration management, performance management, fault management, security management, and software loading management for the BSC6910. Works as the O&M bridge of the LMT/U2000 to provide the BSC6910 O&M interface for the LMT/U2000 and to enable communication between the BSC6910 and the LMT/U2000. Works as an interface to provide the Web-based online help. 3.GCUa General Clock Unit REV:a Obtains the system clock source, performs phase-lock and holdover, and provides clock signals. Unlike the GCUa/GCUb board, the GCGa/GCGb board can receive and process GPS signals 4.SCUB The switching subsystem involves the SCUb/SCUc, high-speed backplane channels in each subrack, and cables between the SCUb/SCUc. 5.GOUC 4-port packet over GE Optical interface Unit REV:c Provides four channels of ATM over channelized optical STM-1/OC-3. Supports ATM over E1/T1 over SDH/SONET. Provides 252 E1s or 336 T1s. Extracts clock signals and sends the signals to the GCUa/GCUb or GCGa/GCGb board. 6.EXOUa

11. 1 BSC6910 interface boards Board Logical Function Type RAT Supported Interface Supported Shared byBandwidth of the Backplane for the Board AOUcATMUMTSIu, Iur, and IubIub and Iu4 GE UOIcATMUMTSIu, Iur, and IubIub and Iu4 GE FG2cIP GSM and UMTS Abis, A, Gb, Iu, Iur, and Iub Abis, A, Gb, Iub, and Iu 4 GE FG2dIPGSMAbis, A, and Gb 4 GE GOUcIP GSM and UMTS Abis, A, Gb, Iu, Iur, and Iub Abis, A, Gb, Iub, and Iu 4 GE ACTUAL WORKING DESSIE BSC 1&2 GOUeIP GSM and UMTS Abis, A, Gb, Iu, Iur, and Iub Abis, A, Gb, Iub, and Iu 4 GE GOUdIPGSMAbis, A, and Gb 4 GE EXOUaIP GSM and UMTS Abis, A, Gb, Iu, Iur, and Iub Abis, A, Gb, Iub, and Iu 20 GE ACTUAL WORKING DESSIE RNC1 POUcTDMGSMAbis and A 4 GE

12. 2 BSC6910service processing board Board Logical Function Type RAT SupportedBandwidth of the Backplane for the Board EGPUa/EGPUbGCUPGSM 4 GE ACTUAL WORKING DESSIE BSC 1&2 EGPUa/EGPUbUCUPUMTS 4 GE ACTUAL WORKING DESSIE RNC 1 EGPUa/EGPUbRMPGSM and UMTS 4 GE ACTUAL WORKING DESSIE BSC 1&2 &RNC1 EGPUa/EGPUbGMCPGSM4 GE EGPUa/EGPUbNASPGSM and UMTS4 GE EGPUa/EGPUbGASPGSM and UMTS4 GE EGPUa/EGPUbUMSPGSM and UMTS4 GE ENIUaNIUGSM and UMTS4 GE EXPUa/EXPUbGCUPGSM4 GE EXPUa/EXPUbGMCPGSM4 GE DPUfGTCGSM4 GE

13. Table 3 BSC6910 OM boards BoardLogical Function TypeRAT SupportedBandwidth of the Backplane for the Board EOMUa Operation, administration and maintenance (OAM) GSM and UMTS 2 GE ACTUAL WORKING DESSIE BSC 1&2 ESAUaService aware unit (SAU)GSM and UMTS2 GE OPTIONAL @ DESSIE BSC FREE Table 4 BSC6910 switching board BoardLogical Function TypeRAT SupportedBandwidth of the Backplane for the Board SCUbMAC switchingGSM and UMTS- SCUcMAC switchingGSM and UMTS - ACTUAL WORKING DESSIE BSC 1&2 Table 5 BSC6910 clock board BoardLogical Function TypeRAT SupportedBandwidth of the Backplane for the Board GCUaClockGSM and UMTS 2 GE ACTUAL WORKING DESSIE BSC 1&2 GCUbClockGSM and UMTS2 GE GCGaClock with GPSGSM and UMTS2 GE GCGbClock with GPSGSM and UMTS2 GE

14. 5 MAIN BSC Boards and Function(SUBSYSTEM) BSC6910 boards can be classified into O&M board Name is EOMUa switching processing board Name is SCUB clock processing board Name is GCUa general service processing board Name is EGPUa interface processing board Name is GOUC

15. The O&M subsystem enables management and maintenance in the following scenarios: routine maintenance, emergency maintenance, upgrades, and capacity expansion. It enables management in data configuration, security, performance, alarm, loading, and upgrade. The O&M subsystem consists of the EOMUa board. 1.O&M Subsystem EOMUa

16. 2. switching subsystem Subsystem SCUB The switching subsystem performs switching of traffic data, signaling, and O&M signals of the BSC6910. Functions Intra-subrack MAC switching Inter-subrack MAC switching Distribution of clock signals and RNC frame number (RFN) signals among service processing boards Hardware Involved The switching subsystem involves the SCUb/SCUc, high-speed backplane channels in each subrack, and cables between the SCUb/SCUc. SCUb-base Inter-Subrack Connection The SCUb in a subrack provides four 10GE ports for inter-subrack connection. There is a connection between every two adjacent nodes. If an intermediate node is out of service, the communication between other nodes is affected. If three or fewer subracks are configured, they are connected in a star topology.

17. 3.Clock Synchronization Subsystem GCUa Clock source The BSC6910 can use the following clock sources: Building Integrated Timing Supply System (BITS) clock, external 8 kHz clock, LINE clock, Global Positioning System (GPS) clock, and local oscillator. BITS Clock BITS clock signals consist of 2 MHz, 2 Mbit/s, and 1.5 Mbit/s clock signals. 1.5 Mbit/s clock signals are T1 clock signals. 2 MHz and 2 Mbit/s are E1 clock signals. 2 MHz is intended for electrical impulse, and 2 Mbit/s is intended for data flow. The BITS clock has two inputs: BITS1 and BITS2. BITS1 and BITS2 correspond to the CLKIN0 and CLKIN1 ports on the GCUa/GCUb/GCGa/GCGb board, respectively. The BSC6910 obtains the BITS clock signals through the CLKIN0 or CLKIN1 port. External 8 kHz Clock Through the COM1 port on the GCUa/GCUb/GCGa/GCGb board, the BSC6910 obtains 8 kHz standard clock signals from an external device. LINE Clock The LINE clock is an 8 kHz clock that is transmitted from an interface board in the MPS to the GCUa/GCUb/GCGa/GCGb board through the backplane channel. The LINE clock has two input modes: LINE1 and LINE2

18. 4.General Service Processing Subsystem (EGPUa) Service Processing Subsystem The service processing subsystem processes BSC6910 services and performs controller functions defined in 3GPP specifications. Functions The service processing subsystem performs the following functions: User data transfer System admission control Radio channel encryption and decryption Data integrity protection Mobility management Radio resource management and control Cell broadcast service control System information and user information tracing Data volume reporting Radio access management CS service processing PS service processing Service processing subsystems communicate with one another through the switching subsystem to form a resource pool and to perform tasks cooperatively EGPUa

19. 5.Interface Processing Subsystem ( GOUC) The interface processing subsystem provides transmission ports and resources for the BSC6910, processes transport-layer and network-layer messages, and enables interaction between BSC6910 internal and external data. Functions The interface processing subsystem provides the following ATM/TDM/IP interfaces: Channelized STM-1/OC-3 optical ports Unchannelized STM-1/OC-3 optical ports FE/GE electrical ports GE optical ports 10GE optical ports The interface processing subsystems processes transport-layer and network-layer messages and hides differences between them. In the uplink, the interface processing subsystem terminates the transmission of transport-layer and network-layer messages on the interface boards. It also transmits the UP, CP, and management plane packets to the corresponding service processing boards. The downlink signal flow is the reverse of the uplink signal flow. Hardware The interface processing subsystem consists of the EXOU, FG2, GOU, POU, and UOI boards.

21. Position of the BSC6910 in the network

23. Test 1.What you understand from this Knowledge Sharing 2.How many EPS and MPS at BSC 1 and BSC2? 3. There are two types of PEM: PEM and PEMa who is our Region BSC working 4. where card is with out standby working 5.What is the difference B/N MPS and EPS 6.Write 5 subsystem and Bored Name