Lecture: 04 Engineer ASAD MEHMOOD

1. ZXC10-BTS HARDWARE ARCHITECTURE Lecture: 04 Engineer ASAD MEHMOOD

2. ZXC10-BTSB Solution ZXC10-BTSB AE BDS RFS PWS Contents

3. ZTE BSSB BTS Solutions • ZTE BTS consists of three subsystems • Baseband Digital Subsystem (BDS) • Radio Frequency Subsystem (RFS) • Power Subsystem (PWS) • Different types of BTSs are implemented by distinct BDS or RFS. • I1 BTS = all-IP BDS + all-IP RFS • I2 BTS = all-IP BDS + local HIRS RFS/remote RFS • AE BTS = (HIRS + all-IP) BDS + HIRS RFS • CBTS = all-IP BDS + all-IP RFS

4. ZTE BSSB BTS Solutions (Cont’d) ZXC10-BTSB I1 ZXC10-BTSB AE BDS RFS RFS BDS

5. ZXC10-BTSB Solution ZXC10-BTSB AE BDS of ZXC10-BTS RFS of ZXC10-BTS PWS of ZXC10-BTS Contents

6. BTSB AE features • Composed of mixed HIRS+IP BDS and usually local HIRS RFS. • Supporting at most 12 carrier sectors with two racks. • Compatible with both ZXC10-BSCB (all-IP) and ZXC10-BSC (HIRS). • No GCM in the BDS so that Time Frequency Subsystem (TFS) is provided in RFS for system clock and frequency generation, which includes GPSTM, FDM and TCM. • SIM is required for transferring clock from HIRS part to IP part.

7. BDS (Baseband Digital Subsystem) TFS (Timing Frequency Subsystem) RFS (Radio Frequency Subsystem) PS (Power Subsystem) ZXC10-BTSB AE Subsystem Main Content

8. Typical BDS Configuration of AE

9. BDS (Baseband Digital Subsystem)

10. HIRS-Baseband Digital Subsystem One EBDS consists of up to 4channel processing modules (CHMs), 2 communication control modules (CCM), 1 RF interface modules (RFIM) and 1 BTS_CDSU module.

11. Baseband Digital Subsystem • Main functions of the EBDS--HIRS • CDMA Baseband digital data forward modulation • CDMA Baseband digital data reverse demodulation • Interface with RFS • Provide Abis Interface to BSC • control center of BTS, communication platform • In logic, EBDS subsystem includes CCM module, CHM module and RFIM module. For the description convenience, CDSU module is described in EBDS subsystem.

12. Baseband Digital Subsystem-Logical Structure CDMA Baseband Data

13. CCM(Communication Control module) • Main Functions: • Centralized control for data signaling route, signaling handling, resource management and maintenance operation of whole EBDS subsystem. • Provide S_HIRS functions, served as a switching unit • Signaling processing and transfer • Maintenance and Management of modules on EBDS Subsystem • Software downloading and data distribution • Maintenance of GPSTM, Receive the TOD message

14. CHM Channel Element Module • CHM, located in the EBDS frame of ZXC10-BTS, is responsible for modulation/demodulation of the channels in CDMA. A single frame has 6 CHM modules per carrier. • CHM implements the following functions: • In Forward link: CHM modulates voice or data frames which sent by CCM board via transceiving interface.And then it sends the modulated signals to RFIM board. • In Reverse link: CHM receive antenna signals which distributed by RFIM via the baseband data interface, and then it demodulates the signals into voice or data frames and sends them to CCM board for switching processing via transceiving interface • CE is in CSM chip, each CHM include 1 or 2 CSM5000 chipset

15. CHMChannel Element Module • 1 to 4 CSM5k chips in CHM5K for 1x, 1 chip include 64 F_CE and 32 R_CE. In 64 F_CE: 36 for voice and the left 28 for data. CSM5K

16. RFIM(Radio Frequency Interface Module) • RFIM Functions: • RFIM is connected with EBDS and RFS. It is controlled by CCM. • RFIM transmits and processes forward and reverse baseband data, TRX control signaling information (configuration control and status alarm). • Clock distribution :It receives 16Chip clock and PP2S from GPS unit ,and then distributes the clock to channel boards

17. SAM (Site Alarm Module) • For any large communication equipment, a perfect alarm system is indispensable. It must monitor the working environment of the communication equipment in real time and give a prompt response to any fault and alarm signal for timely processing and avoiding loss. • Detect the running status of the power module and fans • Environment signals such as door control, flooding, temperature, humidity, smoke etc., • Reports the detection results to the operation and maintenance console through the CCM for processing.

18. EBDS (Baseband Digital Subsystem) TFS (Timing Frequency Subsystem) RFS (Radio Frequency Subsystem) PS (Power Subsystem) ZXC10-BTSB AE Subsystem Main Content

19. FDM Frequency Distribution Module • The FDM board implements the following functions: • Receives clock signals from TCM. • Distributes 10MHz signals or distributes them after phase-lock. • Reports the working status of this board through IIC. FDM Module TRX1 TRX2 TRX3 TRX4 TRX5 TRX6 10MHz

20. EBDS (Baseband Digital Subsystem) TFS (Timing Frequency Subsystem) RFS (Radio Frequency Subsystem) PS (Power Subsystem) ZXC10-BTSB AE Subsystem Main Content

21. RF transceiver RF front End HPA TRX RFE Antenna feeder system BTS test BTM － RFS Structure • RFS mainly enables air interface via antenna. It supports the interface with EBDS via the interface module to implement modulation transmission and demodulation receiving of CDMA signals. It also implements relative check, monitoring, configuration and control functions.

22. TRX Transmitter and Receiver Module In TRX, two receiving interface, RX1 and RX0, are used for diversity receiving.

23. RUN TX RST Green Forward transmitting signals sent by TRX Reset button. RUN indicator. RF IN input end of HPA ON: normal running (B version) Flash: normal running (C version) OFF: power-off or faulty When this button is pressed down, a board will be reset SMA RF cable RX1 Backward receive signals of RFE RX output end of RFE SMA RF cable ALM Red Fault indicator. ON: any error occurs Flash: IIC fault OFF: normal running or power-off RX2 Backward receive signals of RFE RX output end of RFE SMA RF cable RST Reset button. used to reset a board. RS232 Test interface None None RS232 line of DB9 TRX Front Panel

24. RFCM Functions • Located in the TRX Module • The data interface between the baseband digital subsystem (RFIM) and the RF subsystem (TRX) • D/A-A/D conversion Attention: RFCM is inside TRX can not be seen

25. HPA(High Power Amplifier Module

26. HPA Functions • HPA performs power amplification for the TRX forward transmission signals. • When HPA receives the forward transmitted CDMA signals of TRX , it will amplify the power, so that the signals will radiate within the cell via the antenna after they are processed by the duplex filter of the RF front end with proper signal power to cover the planned cellular area.

27. RFE(Radio Front End) Module RFE-DIV RFE-DIV DUP: Duplexer (Receive and Transmit) DIV: Diversity (Receiving)

28. RFE Module Function • RFE is the bridge between the internal system of RFS in the BTS and the external antenna of the BTS • Main Functions: • It implements filtering and low noise amplification on small signals received by the antenna • It implements power allocation on received signals after low noise amplification • It provides receiving/transmission duplexing function (only for DUP) • Performs power monitoring, providing related power detection values

29. ZXC10-BTSB AE Subsystem Main Content • EBDS (Baseband Digital Subsystem) • TFS (Timing Frequency Subsystem) • RFS (Radio Frequency Subsystem) • PS (Power Subsystem)

30. PSMD: Power Distribute Module • PSMD is located in BTS system power distribution box. It distributes the input • -48V DC power into shelves. PSMD board checks and controls the working states • of power system and fan. • PSMC: ±12V:Provide Power for REF&TRX&FDM • PSMB: +5V:Provide Power for EBDS • PPM: +27V:Provide Power for HPA

31. RFE RFE RFE (Alpha) (Beta) (Gamma) HPA HPA HPA R R R R R R X X X X X X 0 1 0 1 0 1 T T T X X X TRX TRX TRX RFCM RFCM RFCM EBDS Typical BTSB AE and Its Principle

32. Thank You