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Huawei Airbridge cBTS3612-1900 User Manual

Cdma base station
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Airbridge cBTS3612 CDMA Base Station
User Manual

System Description

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Summary of Contents for Huawei Airbridge cBTS3612-1900

  • Page 1: System Description

    HUAWEI Airbridge cBTS3612 CDMA Base Station User Manual System Description...
  • Page 2 HUAWEI Airbridge cBTS3612 CDMA Base Station User Manual Local Maintenance Terminal...
  • Page 3 HUAWEI Airbridge cBTS3612 CDMA Base Station User Manual BTS Maintenance...
  • Page 4 1.5cm 7cm Font: Arial 22pt , Product name: Bold 5.3cm 0.7cm HUAWEI 2.5cm, Font: Arial, 9 Ver: T2-030160- 20030125-C-1.21 BOM: 31013260...
  • Page 5 Huawei Technologies Co., Ltd. Administration Building, Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen, P. R. China Postal Code: 518129 Website: http://www.huawei.com BOM: 31013260...

  • Page 7: User Manual

    1. 16K Cover for hectograph; Font: Arial 22 pt; Product name: Bold Airbridge cBTS3612 CDMA Base Station User Manual...
  • Page 8 HUAWEI 1. System Description 2. Local Maintenance Terminal 3. BTS Maintenance Airbridge cBTS3612 CDMA Base Station User Manual V100R002...
  • Page 9 T2-030160-20030125-C-1.21 Product Version V100R002 31013260 Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. Please feel free to contact our local office, customer care center or company headquarters. Huawei Technologies Co., Ltd. Address: Administration Building, Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen, P.
  • Page 10 © 2003 Huawei Technologies Co., Ltd. All Rights Reserved No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks , HUAWEI, C&C08, EAST8000, HONET,...

  • Page 11: About This Manual

    About This Manual Version The product version corresponds to the manual is Airbridge cBTS3612 CDMA Base Station V100R002. Contents This User Manual gives a systematic introduction on the technical principles, structures and maintenance methods of Airbridge cBTS3612 CDMA Base Station (cBTS3612 hereafter).
  • Page 12 Conventions This document uses the following conventions: I. General conventions Convention Description Arial Normal paragraphs are in Arial. Arial Narrow Warnings, cautions, notes and tips are in Arial Narrow. Courier New; message input by the user Terminal Display is in Terminal Display via the terminal is in boldface.
  • Page 13 IV. Keyboard operation Format Description <Key> Press the key with key name expressed with a pointed bracket, e.g. <Enter>, <Tab>, <Backspace>, or<A>. <Key1+Key2> Press the keys concurrently; e.g. <Ctrl+Alt+A>means the three keys should be pressed concurrently. <Key1, Key2> Press the keys in turn, e.g. <Alt, A>means the two keys should be pressed in turn.

  • Page 14: Table Of Contents

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Table of Contents Table of Contents 1 System Overview ......................1-1 1.1 Brief Introduction ....................... 1-1 1.2 System Features ....................... 1-3 1.2.1 Advanced Technology and Excellent Performance..........1-3 1.2.2 Protecting User Investment ................1-4 1.2.3 Convenient Operation and Maintenance............
  • Page 15 User Manual System Description Airbridge cBTS3612 CDMA Base Station Table of Contents 2.3.3 BTS High Power Amplifier Module (BHPA) ............. 2-28 2.3.4 BTS Transceiver Backplane Module (BTBM) ..........2-30 2.3.5 Combining Duplexer Unit (CDU)..............2-31 2.3.6 Duplexer Filter Unit (DFU) ................2-33 2.3.7 Dual Duplexer Unit (DDU)................
  • Page 16 User Manual System Description Airbridge cBTS3612 CDMA Base Station Table of Contents 4.3 Signaling Processing ....................4-9 4.4 Baseband Processing....................4-11 4.5 RF Functions ......................4-13 4.5.1 Power Control ....................4-13 4.5.2 Handoff ......................4-15 4.5.3 Flexible Configuration ..................4-15 4.5.4 Radio Configuration and Channel Support ............
  • Page 17 User Manual System Description Airbridge cBTS3612 CDMA Base Station Table of Contents A.2.3 RF Output Power Requirement ..............A-12 A.2.4 Limitations on Emissions ................A-13 Appendix B EMC Performance ................... B-1 B.1 EMI Performance......................B-1 B.2 EMS Performance ....................B-2 Appendix C Environment Performance ................C-1 C.1 Ambient Temperature and Humidity................

  • Page 18: System Overview

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview 1 System Overview This chapter firstly presents an outline of the cBTS3612 base station system, and then briefs the system features, technical indices and external interfaces, followed by an introduction to the system reliability design in aspects of hardware and software.
  • Page 19 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview cBTS3612 is located between the Base Station Controller (BSC) and the Mobile Station (MS) in the cdma2000 1X mobile communication system. Under the control of the BSC, the cBTS3612 serves as the wireless transceiving equipment of one cell or multiple logical sectors.

  • Page 20: System Features

    1.2.1 Advanced Technology and Excellent Performance cBTS3612 integrates the following technologies to improve its performances: Based on well-developed Huawei ATM platform and cell switching & broadband processing technology, standard interface and open application is enabled. Designed with the resource pool concept, which helps increase the availability of hardware resources and the system's fault-tolerance.

  • Page 21: Protecting User Investment

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Equipped with the blind mate technology on the radio frequency module for convenient maintenance. 　 Intelligent fans with prolonged service life and reduced noise. 　 1.2.2 Protecting User Investment The cBTS3612 is compatible with IS -95A/B and cdma2000 1X, and can be upgraded to cdma2000 1X EV smoothly.

  • Page 22: Flexible Networking Mode

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Its modularized structure reduces the internal connections and improves the reliability of the system, and thus makes the installation and maintenance easier. In the case of whole BTS interruption due to power supply or transmission causes, the cBTS3612 system can restart automatically right after the faults are cleared.

  • Page 23: Multi-Band Supported

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Current equalization hot backup, centralized management, and decentralized power supply are enabled. It makes the power supply system safer and more reliable. It provides automatic alarming through monitoring interface for the power fan, input under-voltage, output over-voltage, overheat and protection against reverse connection.
  • Page 24 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview II. Clock indices <±5 x 10-8 Frequency stability <±5 x 10-10 Annual aging rate III. System capacity 12 sector-carriers Full configuration of one cabinet Full configuration of three cabinets 36 sector-carriers IV.
  • Page 25 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview 1930 - 1990MHz Working band 1.23MHz Channel bandwidth 50kHz Channel precision ±0.05ppm Frequency tolerance 20W (The maximum value measured at the cabinet-top Transmitting power feeder port) VI. Receiver indices 450MHz Band 450 - 460MHz Working band...

  • Page 26: External Interface

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview VIII. EMC indices ETSI EN 300 386 Electromagnetic compatibility and Radio spectrum Matters (ERM) - Telecommunication network equipment - ElectroMagnetic Compatibility (EMC) requirements is the universal EMC standard of telecommunication equipment. The EMC indices of the cBTS3612 comply with ETSI EN 300 386 V1.2.1 (2000 –...

  • Page 27: Um Interface

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Test Environment equipment alarm box Satellite Synchronization Environment interface Test alarm interface interface interface Abis interface OML interface Ethernet interface Remote maintenance serial port PSTN MODEM Figure 1-3 BTS external interface Um interface: interface with MS.
  • Page 28 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview with the network and to enjoy telecommunication services. To implement interconnection between MS and BSS, systematic rules and standards should be established f o r signal transmission on radio channels. The standard for regulating the radio channel signal transmission is called radio interface, or Um interface.
  • Page 29 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Layer 1 is the physical layer, i.e. the bottom layer. It includes various physical channels, providing a basic radio channel for the transmission of higher layer information. Layer 2 is the data link layer, including Medium Access Control (MAC) sublayer and Link Access Control (LAC) sublayer.
  • Page 30 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Support multi-media service, i.e. processing voices, packet data and circuit data of different QoS levels at the same time. 1) MAC sublayer To support data service and multi-media service, cdma2000 1X provides powerful MAC layer to ensure the reliability of services.

  • Page 31: Abis Interface

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview controlling BTS transmitting power. Then BTS adjusts its transmitting power according to the request. Power control command is sent at a rate of 50bit/s or 800bit/s. 2) Reverse power control includes open-loop power control and closed-loop power control.
  • Page 32 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview 1) Composition of Abis interface Abis interface consists of three parts: Abis traffic, Abis signaling and OML signaling, as shown in Figure 1-5. Abis traffic is the interface connecting SDU of BSC and the channel processing unit of BTS.
  • Page 33 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Protocol stack used by Abis traffic is as follows: Abis Traffic SSSAR AAL2 Physical Layer II. Physical layer The physical layer of Abis interface can use E1/T1 interface or STM -1 interface. With E1/T1 interface used, its physical electric parameters comply with CCITT G.703 recommendations.
  • Page 34 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview Cell breath control function. Cell blocking function. Radio measurement report function. 2) Common channel management procedure Paging channel management procedure: it is used to transmit paging channel messages from BSC to MSs through Abis interface. Access channel management procedure: it is used to transmit access channel messages received on the access channel of BTS to BSC through Abis interface.

  • Page 35: Oml Interface

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview 1.4.4 OML Interface OML interface is between BTS and remote OMC. It is actually one of the Abis interface applications, but in the application layer, OML interface is between BTS and the remote OMC.

  • Page 36: Remote Maintenance Serial Port

    Environment alarm interface is an RS-485 serial port connected with the external environment alarm collection box, performing a centralized monitoring to the environment. A communication protocol defined by Huawei is used between BTS and the environment alarm collection box. Therefore, supported environment alarm collection box should be used for the BTS.

  • Page 37: Hardware Reliability Design

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview & Note: Reliability refers to the product capability of performing specified functions in the specified conditions and specified time. There are 3 main indices to describe the reliablity of a system: MTBF: Mean Time Between Failures, normally applicable to recoverable systems.
  • Page 38 Many measures have been taken to improve the board reliability. Moreover, the system reliability is improved through the redundancy design of key parts. Key circuits are designed by Huawei, which lays the foundation of high reliability. 　 The hardware WATCHDOG is equipped for the board, and the board can automatically reset in case of fault.
  • Page 39 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview When faults occur to software, certain automatic error-correction function will be executed, including restarting and reloading. 　 The BTS system also provides manual and automatic re-initialization of different levels, and supports the reloading of configuration data files and board execution programs.

  • Page 40: Software Reliability Measures

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview same electromagnetic environment to degrade to an unacceptable level due to the EMI from it. XII. Lightning protection　 To eliminate the probability of lightning damage on the BTS system, proper measures are taken in the following three aspects: Lightning protection for DC power supply Lightning protection for BTS trunk lines...
  • Page 41 User Manual System Description Airbridge cBTS3612 CDMA Base Station 1 System Overview self-healing capability. The fault tolerance of software is represented in the following aspects: All boards work in a real-time operating system of high reliability. Important data on BCKM are backed up on real-time basis. Operation is switched to the standby board when a fault occurs.

  • Page 42: Hardware Architecture

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2 Hardware Architecture The beginning of this chapter briefs cBTS3612 hardware architecture, followed by the details of four subsystems: baseband, RF, antenna & feeder, and power supply system. This chapter also covers BTS environment monitoring and lightning protection systems.
  • Page 43 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture & Note: In Figure 2-1, the duplexer is CDU, and actually the right duplexer should be selected according to the band class BTS supported. CDU applies to 800MHz band and 450MHz band, DFU applies to 450MHz band, and DDU applies to 1900MHz band, as for the difference between the CDU, DFU and DDU, please refer to "2.3 RF Subsystem".
  • Page 44 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture daisy chains for BCPMs. The BRDM connects via the shorter daisy chain provided to BCPM to form a standard daisy chain, which helps to improve the utilization ratio of channel resource and facilitates the flexible configuration of channel capacity for each sector carrier.
  • Page 45 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture (AGC), multiplexing/demultiplexing of forward & reverse orthogonal (IQ) signals, clock recovery and RF module operation & maintenance. BIFU also performs the control over BTRM, including power-on initialization, function configuration, alarm collection and reporting, and processing of O&M related messages.

  • Page 46: Baseband Subsystem

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 6) RLDU RLDU performs low noise amplification and division of the receiving signals, providing standing wave alarm and forward power checking voltage output, checking the physical connection of the antenna port and monitoring whether the output of BRCU, BHPA signals is normal.
  • Page 47 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Other functional BCIM BCKM units Emergency serial port Clock bus Backplane bus High-speed Optical fiber data bus BTRM BCPM BRDM Figure 2-2 Structure of baseband subsystem Baseband subsystem is connected with BSC through Abis interface provided by BCIM.

  • Page 48: Control & Clock Module (Bckm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Baseband subsystem is physically located in the baseband subrack, powered by power supply subsystem (in the power subrack). Boards generate their own 3.3V, 1.8V power through the distributed power supply module. The configuration of baseband subrack (including board position) is as shown in Figure 2-3.
  • Page 49 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Perform operation and maintenance via the backplane bus for other boards in the baseband subrack, realizing in-band signaling communication. Connected with Local Maintenance Function (LMF) through the 10/100M compatible Ethernet interface.
  • Page 50 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture BCKM comprises the following parts: 1) MPU module MPU controls logic circuits to initialize components. It realizes control and management over BTS system through system software. 2) Clock module Clock module is the clock source of BTS, providing working clock for boards.

  • Page 51: Control Interface Module (Bcim)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.2.3 Control Interface Module (BCIM) I. Overview BCIM is located in BTS baseband subrack. It is a functional entity for the connection of BTS and BSC. Its major functions are as follows: In uplink direction, backplane bus receives O&M command from BCKM and traffic data from BCPM, and transmit ATM cells on the multiple E1 links with IMA technology in compliance with G.804 standards to BSC.
  • Page 52 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture BCIM comprises the following parts: 1) IMA module The purpose of IMA is to inversely multiplex an ATM cell flow based on cells into multiple physical links for transmission. Another purpose is to remotely multiplex the cell flows transmitted on different physical connections into a single ATM cell flow.

  • Page 53: Channel Processing Module (Bcpm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture IV. Index board size 460mm%233.35mm, powered with +27V, power consumption<10W. 2.2.4 Channel Processing Module (BCPM) I. Overview BCPM is logically located between BRDM and E1 interface board on BTS. BCPM is the service processing board of the system with 12 equipped in full configuration.
  • Page 54 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture BCPM High-speed data bus Data bus Baseband Multiplex/demultiplex BRDM processing module module Control bus RS232 Data bus Backplane bus BCKM Backplane CPU module module Clock module Power module Figure 2-6 Structure of BCPM module 1) Multiplex/demultiplex module In forward direction, baseband data in the channel processing board are multiplexed...

  • Page 55: Resource Distribution Module (Brdm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 4) Backplane bus module BCPM communicates with other boards in the BTS baseband part through backplane bus, including control information communication with BCKM and traffic data communication with E1 interface board. 5) Clock module The clock module performs double-frequency phase-locking to the clock signals from the backplane, provides clock for boards, and drives and co-phases the clock...
  • Page 56 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture channel resource and facilitates the flexible configuration of the channel capacity of each sector carrier. BRDM has the following functions and features: Six pairs of optical interfaces provide high-speed data paths to BTRM. When it is necessary to extend optical interfaces, BRDM board can be inserted in BCPM slot.
  • Page 57 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture As shown in Figure 2-7, BRDM board is composed of optical module, high-speed data interface module, switching module, CPU module, bus interface module, power supply module and clock module. Optical module This module converts optical signal into electrical signal.

  • Page 58: Baseband Backplane Module (Cbkm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Clock module The clock module provides 2S, 16%1.2288MHz, 100%1.2288MHz clocks for the local board. III. Interface Optical interface They are on the front panel, 6 pairs altogether. They are connected with BTRMs, transmitting orthogonal (IQ) data and O&M information.
  • Page 59 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Leads in system power and provides distributed power to all boards. Leads in the signal monitoring line for fan subrack and power subrack. Provides protection against misplug. II. Structure Functional units in CBKM are as shown in Figure 2-8.

  • Page 60: E1 Surge Protector (Besp)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.2.7 E1 Surge Protector (BESP) I. Overview BESP is placed in the upper part of BTS. It is a functional entity for BTS to implement lightning protection with E1 trunk line. Two identical BESPs are installed for each cabinet in consideration of limited space on top of the equipment and the convenience of installation and dismounting.

  • Page 61: Fan Module (Bfan)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture The air discharge tube discharges the high voltage to the ground and lowers the voltage to less than 600V. Then the voltage limit mesh further lowers the voltage to less than 30V.
  • Page 62 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture (1) Fan box 2 (2) Fan box 1 (3) LED indicator (4) Fan enclosure (5) BFNB (6) System signal interface (7) Power input interface (8) Blind mate connector (9) BFMM Figure 2-10 Structure of BFAN I.
  • Page 63 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Temperature collection module Fan drive module Main control unit Switch value alarm module Communication module Fan-in-position & fault Indicator drive module detection module Power supply module Figure 2-11 Illustration of BFMM Power supply module: System input DC power is +27V, board power consumption is less than 5W.
  • Page 64 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 3) Interface Power interface It is used to lead in working power for BFMM. Communication serial port 0, 1 Serial port communication ports 0 and 1 provide access for system active/standby serial port.

  • Page 65: Rf Subsystem

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 3) Interface Fan box electrical interface Power supply ports and serial port communication ports are provided for the two fan boxes through MOLEX connectors. System power supply interface The interface leads in system power through big 3-pin connector.

  • Page 66: Bts Transceiver Module (Btrm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture & Note: The above figure illustrates the RF configuration for 450MHz band. For 800MHz band, the duplexer would be CDU. For 1900MHz band, the duplexer would be DDU. In forward link, it performs power adjustable up-conversion and linear power amplification to the modulated transmission signals, filtering the transmission signals to meet the corresponding air interface standard.
  • Page 67 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 1) BTS Intermediate Frequency Unit (BIFU) BIFU consists of up-c onverter, down-converter, multiplexer/demultiplexer, optical interface, clock, CPU, and power supply sub-unit. It is in charge of the conversion between the analog intermediate frequency signals and the digital baseband signals, and the control of the MTRB.
  • Page 68 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture The CPU is in charge of the control of BTRM, which includes the initialization upon power-on, alarm collecting and reporting, and processing operation & maintenance related messages. Power supply With input voltage of +27V, the power supply sub-unit provides power supply to BIFU and BRCU.

  • Page 69: Bts High Power Amplifier Module (Bhpa)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture BTRM -BHPA RF interface The RF transmitting signal is output via this interface to BHPA, where the signal is amplified and then outputted. BTRM -BHPA RS485 interface This interface is used to transfer alarm and control signal, and power detection signal.
  • Page 70 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture II. Structure and principle The structure of BHPA module includes the following parts, as shown in Figure 2-15: RF input BTRM Power amplification RF output Coupler Circulator Sampling port Alarm BDCS...

  • Page 71: Bts Transceiver Backplane Module (Btbm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture RF interface The RF interface of BHPA has one input port and one output port. They are connected respectively with BTRM RF output port via BTBM and CDU/DFU/DDU RF input port via coaxial cable.

  • Page 72: Combining Duplexer Unit (Cdu)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Temperature sensor There are 6 temperature sensors for the 6 BHPA slots, used for sensing the air temperature at each BHPA air outlet. They will convert the information into current and send to BFMM on BHPA for processing.
  • Page 73 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Pr-OUT Pf-OUT Isolator Combiner Directional TX/RXM-ANT Isolator Duplexer coupler RXM-OUT TX-Test RXM-Test Figure 2-17 Structure of CDU Isolator There are two isolators at each input port of the combiner in CDU. They are used to isolate the two carriers from two input ports.

  • Page 74: Duplexer Filter Unit (Dfu)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture RF signals between CDU combiner input ports and BHPA output ports. They are transferred through the blind mate connectors on the backside. BTS transmitting signals, which are transferred to the cabinet-top antenna interface through the RF cable connected with the N-connector at the front side of CDU.
  • Page 75 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture RXD-TEST Diversity receive filter Low-pass filter RXD-ANT RXD-OUT Low-pass filter Duplexer TX-TEST Directional coupler TX/RXM-ANT RXM-TEST RXM-OUT Pf-OUT Pr-OUT D-SUB N-Type SMA-Type Figure 2-18 Structure of DFU Low-pass filter At the transmitting signal input port and main/diversity receiving signal output port, there are three low-pass filters used for low-pass filtering of transmitting and main/diversity receiving signals.

  • Page 76: Dual Duplexer Unit (Ddu)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture BTS transmitting signals, which are transferred to the cabinet-top antenna interface through the RF cable connected with the N-connector at the front side of the module. BTS receiving signals, which are transferred from the cabinet-top antenna interface to DFU for filtering through the RF cable connected with the N-connector on the front side of the module.
  • Page 77 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Pr1-OUT Pf1-OUT TX1-TEST BIAS T TX/RXM-ANT BIAS T COUPLER RXM-TEST RXM-OUT DUPLEXER Pr2-OUT Pf2-OUT TX2-TEST BIAS T TX/RXD-ANT BIAS T COUPLER RXD-TEST RXD-OUT DUPLEXER D-SUB N-Type SMA-Type Figure 2-19 Structure of DDU Low-pass filter The low-pass filter is used to suppress the high-order harmonic wave.

  • Page 78: Receive Lna Distribution Unit (Rldu)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Signals between transmit input port and BHPA port. They are transferred through the blind mate connectors on the back side. Transmitting signals, which are transferred to the cabinet -top antenna port through the RF cable connected with the N-connector at the front side of DDU.
  • Page 79 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture RXBD-IN RXBM-IN RXAD-IN RXAM-IN APf-IN RXAM-TEST VSWR and power APr-IN check BPf-IN RXBM-TEST BPr-IN RXAM1 RXAM2 RXAD1 Switch distribution RXAD2 module module RXAM3/RXBM1 RXAM4/RXBM2 RXAD3/RXBD1 RXAD4/RXBD2 Power supply DC-IN VSWR check processing Forward power output...

  • Page 80: Bts Rf Fan Module (Brfm)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture exception of transmit signal power of antenna can be monitored in real time. LNA status monitoring circuit monitors the voltage and current of the 4 LNAs inside RLDU. It gives alarm when fault t is found. III.
  • Page 81 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture equipment service life and improve the external performance of the overall system on the premise that the system works in a safe thermal status. The Pulse Wide Modulation (PWM) control signal regarding the fan speed can be generated by the MCU of the local board or configured by the control unit of BTRM module.
  • Page 82 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture BBFM Panel indicator HPAU driving alarm Interface signal isolation BHPA circuit circuit Fan cover Temperature Modulation collection circuit External temperature collection Serial port Communication BTRM Watchdog interface Figure 2-22 Structure of BBFM module MCU module The MCU module collects and analyzes the temperature information to generate PWM signal for controlling the fan speed, receives alarm signals generated by...
  • Page 83 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Interface with the fan cover Including fan alarm signal, panel indicator, and fan power interface. 4) Index Size of BBFM: 200.0mm%55.0mm. II. BTS BTRM FAN Lamp Module (BBFL) 1) Overview BBFL has three RUN indicators to indicate the running status of BTRM module, fans and BHPA module.

  • Page 84: Antenna & Feeder Subsystem

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Fan cover port interface module It is connected with the fan cover of BBFM. 3) Panel indicator LED1: BTRM operating signal LED2: Fan operating signal LED3: BHPA operating signal 4) Index Size of BBFL: 55.0mm%25.0mm.
  • Page 85 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Antenna Sector α Jumper Sector Sector β γ Feeder Jumper BTS cabinet Figure 2-24 Structure of RF antenna & feeder I. Antenna Antenna is the end point of transmitting and start p oint of receiving. Type, gain, coverage pattern and front-t o-rear ratio of the antenna can affect the system performance.
  • Page 86 Since 7/8 inch feeder should not be bent, the tower top (or building roof) antenna and the feeder, indoor cabinet and the feeder should be connected via jumpers. The specifications of Huawei standard jumpers are 1/2 inch, 3.5m long, with 7/16DIN connectors.
  • Page 87 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture III. Lightning arrester (Optional) When the cBTS3612 is configured for 1900MHz band, the lightning arrester is necessary, but for the other bands, it is not necessary. The lightning arrester is used to prevent damage of lightning current to the antenna and feeder system.

  • Page 88: Dual-Satellite Synchronization Antenna & Feeder

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.4.3 Dual-Satellite Synchronization Antenna & Feeder I. Overview Many important features of CDMA system are closely related with global satellite navigation system and are much dependent on it. If global satellite navigation system does not work for a long time, the whole network will collapse.
  • Page 89 In this way, the position of the user can be figured out. The algorithm used is similar to that of GPS. Huawei BTS system uses intelligent software phase-locking and holdover technology to minimize the interference such as signal wander and jitter due to ionosphere error and troposphere error of GPS satellites.
  • Page 90 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Polarity: RHCP GPS/GLONASS dual-satellite receiving antenna This antenna receives L1 GPS signals (1.575GHz) and GLONASS signals (1.611GHz). The power voltage is 5~18V. III. Feeder The feeder is the physically foamed polyethylene insulation RF coaxial cable, with the impedance of 50-ohm and specification of 10-FB.

  • Page 91: Power Supply Subsystem

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.5 Power Supply Subsystem 2.5.1 Overview BTS built-in power supply module converts -48V DC into +27V for the BTS, forming the power supply subsystem together with power distribution, lightning protection and power monitoring.

  • Page 92: General Structure

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.5.2 General Structure The -48V power is filtered by the EMI filter on top of the cabinet, and then goes down along the wiring trough, and finally connected to the input bus bar of t h e power subrack backplane.
  • Page 93 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 1) Input indices Input mode: -48VDC Operating voltage range: -40VDC~-60VDC Maximum input current: 30kA 2) Wiring mode The positive and negative poles of the power cord are connected with V+ and V- terminals of the lightning arrester.
  • Page 94 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Output voltage: +27!0.5V Output voltage range: +25~+29VDC Output over-voltage protection point: +30.5!0.5VDC DC output rated current: 65A Output current-limiting point: 68.5~71.5A Regulated voltage precision: Ÿ!1% Load regulation: Ÿ!0.5% Voltage regulation: Ÿ!0.2% Output noise voltage Balanced noise of phone: Ÿ2.0mV (300~3400Hz)

  • Page 95: Power Supply Monitoring

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture EMI requirement Conducted interference: At frequency 150kHz~30MHz, the conducted interference level in the power cord of the tested equipment conforms to class "A" standard in EN55022 Table 1. Radiated interference: At frequency 150kHz~1000MHz, the radiated interference level of the power cord of the tested equipment conforms to class "A"...

  • Page 96: Bts Direct Current Switchbox (Bdcs)

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.5.5 BTS Direct Current Switchbox (BDCS) BDCS is used to distribute power to the system. After t he +27V power is outputted from the power subrack, it is connected to the distribution copper bar in the switchbox via the bus bar installed on the back pole.

  • Page 97: Alarm Box Input

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Providing 10 switch value inputs (optical/electrical isolation). Providing 6 relays (max. 5A/220V ) to drive external actuators. Providing 2 PWM outputs (8bit resolution, basic clock no greater than 500kHz). Driving of 7 independent collector open-circuit gates (absorption current 300mA).

  • Page 98: Interface For Actuators

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.6.3 Interface for Actuators The environment monitoring function of BTS also includes the following interfaces for actuators. 1) Six (A~F) constantly open/closed optional relays for controlling the protection devices.
  • Page 99 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Systematic protection: Since information equipments are extensively connected and lightning surge is everywhere, protection only on equipment and board level is not enough. A systematic protection should be considered, including the equipment office (site) where the BTS is located.

  • Page 100: Lightning Protection For Dc

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.7.2 Lightning Protection for DC I. Multi -level protection of power supply The BTS power supply subsystem is normally in 5 -level protection, as shown in Figure 2-28. 4 kV 2.5 kV 1.5 kV...

  • Page 101: Lightning Protection For Trunk Line

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture 2.7.3 Lightning Protection for Trunk Line I. Overview Three kinds of trunk lines are supported in BTS: 75Ù coaxial cable (E 1), 120Ù twisted pair (E1) and optical fiber. Lightning protection is out of question if optical fiber is used as the BTS is connected with fiber tail.
  • Page 102 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Into the cabinet (8 pairs of E1s) Out from the cabinet (4 pairs of E1s) 10mm 16 E1 lightning DB37 protection units Out from the Fixing hole Ф 3.5 cabinet (4 pairs of E1s)

  • Page 103: Lightning Protection For Antenna & Feeder Port

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Core Lead in Lead out DB25 DB37 Sheath PGND Figure 2-32 Principle of E1 lightning protection units 2.7.4 Lightning Protection for Antenna & Feeder Port I. Lightning protection for RF antenna & feeder port Antenna &...
  • Page 104 User Manual System Description Airbridge cBTS3612 CDMA Base Station 2 Hardware Architecture Active lightning protection: A discharge tube is used as the lightning arrester. When the voltage at both ends of the discharge tube comes to a specified value, the two ends will be connected, hence the lightning protection is realized. The dual-satellite synchronization antenna &...

  • Page 105: Software Architecture

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture 3 Software Architecture 3.1 Overall Architecture cBTS3612 software consists of applications and bottom layer software in terms of layer. And in terms of functional unit, there are main control software, O&M software, clock software, BCIM software, BCPM software, BRDM software and BTRM software.

  • Page 106: Module Description

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture drivers provide basic functions for the upper layer to operate the physical devices and for the calling by applications. 3.2 Module Description 3.2.1 Main Control Software I. Function The main control software is primarily used for the control of traffic flow.
  • Page 107 User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture Resource blocking function: cells, carriers or channel elements can be blocked or unblocked. Resource checking function: Main control software checks the resources of BCPM regularly, such as dedicated channels and common channels, to make sure the resources allocated on both sides are identical.

  • Page 108: O&M Software

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture or released, main control software needs to distribute or release the AAL2 traffic link of the corresponding Abis interface. Physical channel modification function: in the process of a communication over a dedicated channel, BSC can modify some parameters of this channel on the physical layer.
  • Page 109 User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture the other hand, OMU receives status report and alarm report from the function units, make proper processing and report to OMC. II. Structure The structure of the operation & maintenance software is shown in Figure 3-3. O&M software Status Data...

  • Page 110: Clock Software

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture Log management Equipment operations and abnormal information are recorded to help locate faults. Maintenance console interface With the local MMI, the user can perform operation & maintenance locally to the BTS via the Ethernet.

  • Page 111: Bcim Software

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture Software phase-locking sub-module: it combines the methods of hardware counting software phase-locking provide GPS/GLONASS synchronization clock signal for the system. Hardware phase-locking control sub-module: this sub-moduloe performs initialization settings for the devices of hardware phase-locked loop (PLL). 2) Operation &...

  • Page 112: Bcpm Software

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture 2) Operation & maintenance Public part: process messages related to OMU interface, such as log management, board self-check, public query, interface tracing, board s oftware loading, link test, and related functions. Private maintenance: perform management of E1/SDH interface, IMA state machine and IMA configuration, BCIM board status management, alarm collection, alarm processing and reporting.

  • Page 113: Brdm Software

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture channel, it receives reverse messages on the air, and forwards them to BSC through the main control software. Dedicated channel sub-module: under the control of the control & management sub-module, it sets up or releases traffic channel.

  • Page 114: Btrm Software

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture negotiated with BTRM software, it adapts signaling from OMU or BCKM and sends them to BTRM, or adapts signaling from BTRM and sends them to OMU or BCKM. 2) Operation &...
  • Page 115 User Manual System Description Airbridge cBTS3612 CDMA Base Station 3 Software Architecture Public parameter measurement: BTRM makes a regular measurement of the forward transmit power and Received Signal Strength Indication (RSS I), and reports the measurement result to BCKM. Loopback test: BTRM software receives loopback test command from the main control software and returns the test data.

  • Page 116: System Function

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function 4 System Function This chapter describes the main functions of cBTS3612, including transmission networking, call procedure, signaling processing, baseband processing, RF functions, and operation & maintenance function. 4.1 Transmission Networking cBTS3612 supports star networking, chain networking and tree networking.
  • Page 117 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Chain networking is a perfect solution to certain requirements and can save the transmission resources. 　 The disadvantage of this mode is that signals should pass quite a few network sections, making the line less reliable.

  • Page 118: Call Procedure

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function 4.2 Call Procedure Call procedure mainly includes speech service call procedure and data service call procedure. This section gives some typical examples to introduce the MS call procedures. 4.2.1 Speech Service Call Procedure I.
  • Page 119 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function MSC sends "Assignment Request" message to BSC to request BSS to assign radio resources. BSC sends “Abis-BTS Setup” message to BTS, to request BTS to allocate radio resources for the call. BTS sends “Abis-Connect”...
  • Page 120 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Paging Request Abis-PCH Msg Transfer(GPM) Paging Response Abis-ACH Msg Transfer(PRM) CM Service Req Abis-PCH Msg Transfer(Base Ack) Base Ack Order Assignment Req Abis-BTS Setup Abis-Connect Abis-Connect Ack Abis-BTS Setup Ack (10) Abis-IS2000 FCH Fwd(Null data) (11)

  • Page 121: Data Service Call Procedure

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function BSC sends “Abis-Connect Ack” to BTS in response to “Abis-Connect” message. 10) BTS completes resource allocation, and sends “Abis-BTS Setup Ack” message to BSC. 11) BSC sends “Abis-IS2000 FCH Fwd” message to BTS, to order BTS to send null frame to MS.
  • Page 122 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function PDSN (1) Origination (2) BS ACK (3) CM Service Request (4) Assignment Request ECAM (6) Tch Preamble (7) BS Ack Order (8) MS Ack Order (9) Service Connect Msg (10) Service Connect Cmp Msg (11) A 9-Setup -A8 A11 Registration...
  • Page 123 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function 10) After receiving service connection message, MS responds with one service connection complete message. 11) BSC sends “A9-Setup-A8” message to PCF, to request to establish A8 connection. 12) PCF sends “A11-Registration-Request” to PDSN, to request to establish A10 connection.

  • Page 124: Signaling Processing

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function (1) Supplemental Channel Request Message (2) Abis-BTS Setup (3) Abis Connect (4) Abis Connect Ack (5) Abis-BTS Setup Ack (6) Abis Burst Request (7) Abis Burst Response (8) Abis Burst Commit (9) Extended Supplemental Channel Assignment Message Figure 4-7 Reverse SCH establishment procedure If the packet data call is established, MS may send “Supplemental Channel...
  • Page 125 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function processing, common channel processing, dedicated channel setup and release, traffic bearing and power control. I. Signaling processing on Abis interface physical layer and transmission layer Abis interface physical layer utilizes IMA technology. BTS sets up or deletes IMA link sets.

  • Page 126: Baseband Processing

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function VIII. Power control BTS performs reverse quick power control and performs reverse outer loop power control with the coordination of BSC. 4.4 Baseband Processing Baseband processing performs physical layer function on Um interface, processing baseband data of all full-duplex channels in CDMA system.
  • Page 127 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Long code scrambling In the forward channel, long code scrambling is used to scramble the user data to provide encryption function. Walsh code spreading In the forward channel, Walsh code is used to identify each user. QPSK modulation Quadrature Phase Shift Keying (QPSK) modulation is used in the forward channel.

  • Page 128: Rf Functions

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function (CRC check bit and end bit) to get the information bits, then sends them to the higher layer for processing. 4.5 RF Functions cBTS3612 RF functions meet the requirements of TIA/EIA IS -97-D protocol. It features high transmission power, high sensitivity, flexible configuration, easy operation &...
  • Page 129 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function EIB (Erasure Indicator Bit) method When the MS adopts EIB power control method, it will detect forward frame quality, and feed back the information to the BTS via EIB. The BTS will adjust the transmit power according to EIB information.

  • Page 130: Handoff

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Eb/Nt value to issue power control bit, thus the purpose of indirectly controlling the MS is achieved. 4.5.2 Handoff I. Types The handoff can be divided into the following three types according to the different processing flow: Hard handoff The MS will firstly interrupt the connection with the previous BTS, then set up the...

  • Page 131: Radio Configuration And Channel Support

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function control the sensitivity of the receive path and the transmit power to ensure that the forward link and the reverse link are balanced in the system. 4.5.4 Radio Configuration and Channel Support I.
  • Page 132 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Channel type Channel rate (bit/s) 9600, 4800, 2400, or 1200 14400, 7200, 3600, or 1800 R-FCH 9600, 4800, 2700, or 1500 (20ms frames) 14400, 7200, 3600, or 1800 (20ms frames) 9600 R-SCCH 14400...
  • Page 133 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function F-PICH (Forward Pilot Channel) Signals are transmitted on F-PICH all the time. The BTS will transmit a fixed signal in the pilot channel. This signal serves to provide phase reference for the coherent demodulation of MS receiver to ensure coherent detection, and facilites MS to acquire synchronization signals from the synchronization channel and sector identification information.
  • Page 134 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function F-BCH (Forward Broadcast Channel) F-BCH is used by BTS to send the system information and necessarily broadcast message (such as short message). F-BCH operates in discontinuous mode. F-PCH (Forward Paging Channel) F-PCH is used by BTS to send the system information and MS-specific information to MS.
  • Page 135 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Reverse CDMA channel R-TCH R-TCH R-EACH R-CCCH R-ACH (RC3~4) ( RC1~2) R-FCH R-PICH R-PICH R-PICH R-EACH R-CCCH R-SCCH R-DCCH R-FCH R-SCH R-PC Subchannel Figure 4-12 Configuration of reverse physical channel R-ACH (Reverse Access Channel) R-ACH is used by MS to originate the communication with BTS, and respond to paging channel message.

  • Page 136: Easy Installation And Operation

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function R-P C subchannel (Reverse Power Control sub-channel), only used to configure RC3 and RC4. The MS shall supporting inner loop power control and outer loop power control on this channel. R-EACH (Reverse Enhanced Access Channel) R-EACH is used by MS to originate the communication with BTS, or respond to the message that is specially sent to MS.

  • Page 137: Cell Breath

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function 4.5.7 Cell Breath BTS can control the transmit power and receive sensitivity so as to adjust the effective coverage of cells and balance the system load. This feature is especially important to CDMA system.

  • Page 138: Interface Management

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function 4.6.2 Interface Management I. Abis interface management Abis interface management procedure includes the allocation, setup and management of Abis interface transmission links (including E1/optical link, ATM link and TCP/IP link). The ATM link setup procedure is first originated through a default OML PVC.

  • Page 139: Test Management

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function 4.6.3 Test Management Test management is an important function of BTS maintenance. When a BTS fault occurs, test will be conducted to locate the problem. In the process of BTS operation, it is also necessary to make regular tests to some items so as to monitor the performance change of BTS.

  • Page 140: Event Reporting And Processing

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Availability status is the explanation of the operational status, which is defined as follows: Status (availability Description Cause status) Operation is abnormal due to serious Failed Critical alarm occurs. fault (alarm message can still be reported).

  • Page 141: Equipment Management

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Clock alarm There are various clock source alarms and phase-locked loop failure alarm. Power alarm There are over-voltage or under-voltage alarm, and power failure alarm. Other alarms There are board hardware fault, internal bus alarm and software running error. After receiving the board alarm message, OMU takes measures according to the alarm severity.
  • Page 142 User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function Re-initialization A managed object may need to be re-initialized for some reasons (usually a fault has occurred to the equipment or a great deal of data need to be re-configured). Then OMC can directly send commands to make it re-initialized.

  • Page 143: Site Configuration

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function The parameter configuration messages of this function are sent by OMC. The result of this function is that clock module outputs satisfactory clock signals. BCIM configuration BCIM configuration includes: IMA link group and link configuration.

  • Page 144: Operation Status Tracing

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 4 System Function OMC sends BTS local cell configuration message and the result of execution is that BTS gets the local cell configuration relation. 4.6.8 Operation Status Tracing Operation status tracing is an important approach to check when the system is operating normally.

  • Page 145: System Configuration

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration 5 System Configuration This chapter introduces cBTS3612 system configuration, based on which some typical configuration examples are given. With this chapter, users can get a basic understanding of cBTS3612 configuration principle. 5.1 Overview BTS consists of the following parts in physical structure: Power distribution box...
  • Page 146 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Power distribution box Baseband subrack 12 13 14 15 16 17 18 19 20 21 subrack Fan box 1 Fan box 2 subrack subrack RLDU subrack RLDU RLDU RLDU CDU/DFU subrack...
  • Page 147 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Figure 5-2 Front view of a basic cabinet...

  • Page 148: Baseband Subrack Configuration

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration 5.1.2 Baseband Subrack Configuration The baseband subrack in full configuration is shown in Figure 5-3. 12 13 14 15 16 17 18 19 20 21 Figure 5-3 The baseband subrack in full configuration The boards in the baseband subrack include BCIM, BCPM, BRDM, and BCKM.
  • Page 149 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Table 5-1 Configuration of BCPMs BTS configuration Number of type-A BCPM Number of type-B BCPM Not recommended Not recommended S111 S222 S333 S444 The above configurations are for cdma2000 1X system. For 3-sector configuration, type-B BCPMs are recommended.

  • Page 150: Power Supply Subrack Configuration

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration 5.1.3 Power Supply Subrack Configuration Power supply module provides +27V power for the whole system, 5 modules in full configuration, as shown in Figure 5-4. Figure 5-4 Power supply subrack in full configuration The power supply modules (4＋1 redundancy) can ensure at least 7200W output.

  • Page 151: Configuration Of Antenna Parts

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration RLDU0 RLDU1 RLDU2 10 10 Figure 5-5 RF modules in full configuration (the duplexer in the figure is CDU) There are 2 RF subracks in BTS, each subrack with 6 BTRM slots and 6 BHPA slots. Empty slots are covered with dummy panels.

  • Page 152: Typical Configurations

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration For 3-sectors a n d 6-sectors configuration, each sector needs one bi-polarization antenna or two uni-polarization antennae. For operation at 1900MHz, lightning arrester should be equipped for the antenna system, while the tower-top amplifier is optional.
  • Page 153 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration RLDU Figure 5-6 O(1) RF configuration BTRM BHPA Main_ ANT Div._ ANT Main_RX_OUT TX_RFm PA_IN PA_OUT TX_IN BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm RX_RFd REVCPL_OUT Div._RX_OUT RLDU A_Rm1 A_Main_RX_IN A_Rm2 A_FWDCPL_IN A_REVCPL_IN...
  • Page 154 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration II. S(1/1/1) Configuration The following is the configuration of cBTS3612 for Type S(1/1/1) (i.e: 1 carrier x 3 sectors): 1 BCIM, 1 BRDM, 1 -2 BCKMs, and BCPM can be configured according to actual requirement.
  • Page 155 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration 2 unipolarization directional antennas or 1 bipolarization directional antenna for each sector. The configuration of the RF modules is shown in Figure 5-9. Logic connection of RF modules of one-sector is shown in Figure 5-10. sector0 sector1 sector2...
  • Page 156 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Main_ ANT Div._ ANT BTRM BHPA Main_RX_OUT FWDCPL_OUT TX_RFm PA_OUT PA_IN BIFM BRCM TX_RFd REVCPL_OUT RX_RFm Div._RX_OUT RX_RFd BTRM BHPA Main_RX_OUT TX_RFm PA_OUT PA_IN TX1_IN BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm REVCPL_OUT...
  • Page 157 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration sector0 sector1 sector2 RLDU RLDU RLDU Figure 5-11 S(3/3/3) RF configuration 5-13...

  • Page 158: Typical Configuration Of Cbts3612 For 800Mhz Band

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Main_ ANT Div._ ANT BTRM BHPA Main_RX_OUT FWDCPL_OUT TX_RFm PA_OUT PA_IN BIFM BRCM TX_RFd REVCPL_OUT RX_RFm Div._RX_OUT RX_RFd BTRM BHPA Main_RX_OUT TX_RFm PA_OUT PA_IN TX1_IN BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm RX_RFd...
  • Page 159 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration RLDU Figure 5-13 O(2) RF configuration BTRM BHPA Main_ ANT Div._ ANT Main_RX_OUT TX_RFm PA_IN PA_OUT TX1_IN BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm REVCPL_OUT RX_RFd TX2_IN Div._RX_OUT BTRM BHPA PA_OUT TX_RFm PA_IN...
  • Page 160 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration II. S(1/1/1) Configuration The following is the configuration of cBTS3612 for Type S(1/1/1) (i.e.: 1 carrier x 3 sectors): 1 BCIM, 1 BRDM, 1 -2 BCKMs, and BCPM can be configured according to actual requirement.
  • Page 161 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration & Note: The CDU frequency is not adjustable. The carrier channel number of its upper corresponding subrack is higher and the carrier channel number of its lower corresponding subrack is lower. In the actual configuration, the specific carrier module slot should be determined by the specific CDU channel numbers.
  • Page 162 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Logic connection of RF modules of one-sector is shown in Figure 5-18. sector0 sector1 sector2 RLDU RLDU RLDU Figure 5-17 S(4/4/4) RF configuration 5-18...
  • Page 163 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration BHPA BTRM Main_ ANT Div._ ANT Main_RX_OUT PA_OUT PA_IN TX1_IN TX_RFm BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm REVCPL_OUT TX2_IN RX_RFd Div._RX_OUT Main_ ANT Div._ ANT BTRM BHPA Main_RX_OUT TX1_IN FWDCPL_OUT PA_IN PA_OUT...
  • Page 164 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration sector1 sector3 sector5 sector0 sector2 sector4 RLDU RLDU RLDU Figure 5-19 S(2/2/2/2/2/2) RF configuration Sector0 antenna BTRM BHPA Main_ ANT Div._ ANT PA_OUT Main_RX_OUT TX_RFm PA_IN TX1_IN TX_RFd BIFM BRCM FWDCPL_OUT...

  • Page 165: Typical Configuration Of Cbts3612 In 1900Mhz Band

    User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration 5.2.3 Typical Configuration of cBTS3612 in 1900MHz Band The duplex supported currently in this band is DDU, and it is expected that CDU be supported also in the future with reference to 1900MHz band planning. I.
  • Page 166 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration BTRM BHPA Main_ ANT Div._ ANT Main_RX_OUT TX_RFm PA_OUT PA_IN TX1_IN BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm REVCPL_OUT RX_RFd TX2_IN Div._RX_OUT RLDU A_Rm1 A_Main_RX_IN A_Rm2 A_FWDCPL_IN A_REVCPL_IN A_Rm3/B_Rm1 A_Div._RX_IN A_Rm4/B_Rm2 A_Rd1 B_Main_RX_IN...
  • Page 167 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration sector0 sector1 sector2 RLDU RLDU RLDU Figure 5-23 S(1/1/1) RF configuration III. S(2/2/2) Configuration The following is the configuration of cBTS3612 for Type S(2/2/ 2) (i.e.: 2 carriers x 3 sectors): 1 BCIM, 1 BRDM, 1 -2 BCKMs, and BCPM can be configured according to actual requirement.
  • Page 168 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration sector0 sector1 sector2 RLDU RLDU RLDU Figure 5-24 S(2/2/2) RF configuration BTRM BHPA Main_ ANT Div._ ANT Main_RX_OUT TX_RFm PA_OUT PA_IN TX1_IN BIFM BRCM TX_RFd FWDCPL_OUT RX_RFm RX_RFd REVCPL_OUT TX2_IN Div._RX_OUT...
  • Page 169 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration IV. S(2/2/2/2/2/2) Configuration The following is the configuration of Type S(2/2/2/2/2/2) (i.e.: 2 carriers x 6 sectors): 1 BCIM, 2 BRDMs, 1-2 BCKMs, and BCPM can be configured according to actual requirement.
  • Page 170 User Manual System Description Airbridge cBTS3612 CDMA Base Station 5 System Configuration Sector0 antenna BHPA BTRM Main_ ANT Div._ ANT PA_OUT Main_RX_OUT TX_RFm PA_IN TX1_IN TX_RFd BIFM BRCM FWDCPL_OUT RX_RFm TX2_IN REVCPL_OUT RX_RFd Div._RX_OUT Sector1 Sector0 antenna Main_ ANT Div._ ANT BHPA BTRM Main_RX_OUT...

  • Page 171: Appendix A Technical Performance Of Receiver And Transmitter

    System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Appendix A Technical Performance of Receiver and Transmitter The technical specifications of BTS receivers and transmitters comply with or surpass all the performance requirements defined in the IS-97-D Recommended Minimum Performance Standards for cdma2000 Spread Spectrum Base Stations.
  • Page 172 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Eb/N0 measurement value is decided by whichever is bigger of the Eb/N0 values in two RF input ports. Table A-2 Maximum FER of F-FCH or R-DCCH receiver in demodulation performance test under RC1 FER limits (%) Data rate (bit/s) Lower limit Eb/N0...
  • Page 173 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Table A-6 Maximum FER of R-SCH (Turbo Code) receiver in demodulation performance test under FER limit (%) Data rate (bit/s) Lower limit Eb/N0 Lower limit Eb/N0 19200 20% @ 0.6 dB...
  • Page 174 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter value. FER of 4 possible data rates should be calculated respectively. With 95% confidence, the FER for each data rate shall not exceed that given by linear interpolation on a log10 (FER) scale between the two values given in Table A-13 and Table A-14.
  • Page 175 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Table A-13 Maximum FER of demodulation performance test of R-FCH or R-DCCH receiver under FER limits (%) Case Data rate (bit/s) Lower limit Eb/N0 Upper limit Eb/N0 9600 4800...
  • Page 176 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Table A-15 Channel models for the R-TCH receiving performance test Condition Number of Channel Simulator configurations 1 (3 km/h, 1 path) 2 (8 km/h, 2 paths ) 3 (30 km/h, 1 path) 4 (100 km/h, 3 path) Table A-16 Maximum FER of demodulation performance test of R-FCH receiver under RC1...
  • Page 177 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Table A-18 Maximum FER of demodulation performance test of R-FCH or R-DCCH receiver under FER limits (%) Case Data rate (bit/s) Lower limit Eb/N0 Upper limit Eb/N0 9600 (20 ms) 2.4% @ 3.4 dB...
  • Page 178 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter Table A-21 Maximum FER of demodulation performance test of R-FCH or R-DCCH receiver under FER limits (%) Case Data rate (bit/s) Lower limit Eb/N0 Upper limit Eb/N0 14400 2.2% @ 3.2 dB...

  • Page 179: Receiving Performance

    System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter A.1.4 Receiving Performance I. Sensitivity 450MHz band and 1900MHz band: The R-TCH FER shall be <1.0% with 95% confidence when -126dBm/1.23MHz CDMA RC3 signal level is inputted at BTS RF main and diversity input ports. 800MHz band: The R-TCH FER shall be <1.0% with 95% confidence when -127dBm/1.23MHz CDMA RC3 signal level is inputted at BTS RF main and diversity input ports.

  • Page 180: Limitations On Emissions

    System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter station simulator. When R -TCH FER maintains <1.5%, the output power of mobile station simulator changes less than 3dB whether there is single-tone interference or not.

  • Page 181: Received Signal Quality Indicator (Rsqi

    System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter At BTS RF input port, the conducted spurious emissions within other frequency range of 0~6GHz is <-47dBm/30kHz. II. Radiated spurious emissions In compliant with local radio specifications. A.1.6 Received Signal Quality Indicator (RSQI) RSQI is defined as the signal-to-noise ratio Eb/N0, where Eb is the energy per bit including the pilot and power control overhead and N0 is the total received...

  • Page 182: Modulation Requirements

    System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter II. Frequency tolerance Within the working temperature range, the average difference between the actual carrier frequency of CDMA transmit sector and the carrier frequency of the dedicated transmit sector is less than !5%10 (!0.05ppm )of the designated frequency.

  • Page 183: Limitations On Emissions

    System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter III. Code domain power For RC1and RC2, the code domain power in each inactive W channel shall be 27 dB or more below the total output power. For RC3 and RC4,the code domain power in each inactive W channel shall be 30 dB or more below the total output power.
  • Page 184 System Description Appendix A Technical Performance of Receiver User Manual Airbridge cBTS3612 CDMA Base Station and Transmitter II. Radiated spurious emissions In compliant with local radio specifications. A-14...

  • Page 185: Appendix B Emc Performance

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix B EMC Performance Appendix B EMC Performance ETSI EN 300 386 Electromagnetic Compatibility and Radio Spectrum Matters (ERM); Telecommunication network Equipment. ElectroMagnetic Compatibility (EMC) Requirements are the EMC standards of telecommunication equipment globally applicable.

  • Page 186: Ems Performance

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix B EMC Performance B.2 EMS Performance 1) R-F anti-electromagnetic interference (80 MHz~1000MHz ) Values of RF anti-EMI test are listed in Table B-3. Table B-3 Values of RF anti-EMI test Test port Test level Performance class...
  • Page 187 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix B EMC Performance Table B-5 Requirement for ESD test level Discharge mode Test level Performance class Contact 2kV, 4kV 2kV, 4kV, 8kV & Note: 1. Test method is the same as IEC 61000-4-2 [5]. 2.
  • Page 188 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix B EMC Performance Test port Test level Performance class Line~ line, 1kV Control line, signal line (outdoors) Line~ ground, 2kV & Note: The test method is the same as IEC61000-4-5 [11]. 6) Common-mode fast transient pulse The signal &...

  • Page 189: Appendix C Environment Performance

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix C Environment Performance Appendix C Environment Performance In compliance with ETSI, environmental conditions of products include requirements in three aspects: operation environment, transportation environment and storage environment. C.1 Ambient Temperature and Humidity 1) Operation environment compliance with...

  • Page 190: Illumination

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix C Environment Performance 3) Transportation environment In compliance with IEC60721-3-2 2K4/2B2/2C2/2S2/2M2 and IEC 300 019-2-2 T2.3 "Public Transportation" level. Precipitable particle Floating particle No requirement mg/m Gravel mg/m C.3 Illumination 1) Operation environment In compliance with IEC60721-3-3 3K3/3Z2/3Z4/3B1/3C2/3S3/3M1 and ETS 300 019-2-3 T3.1 environment level.
  • Page 191 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix C Environment Performance 2) Storage environment In compliance with IEC60721-3-1 1K4/1Z2/1Z3/1B2/1C2/1S3/M2 and IEC 300 019-2-1 T1.2 "Weather Protection, No Temperature Control" level: Atmospheric press 70~ 106 Wind speed 0.3~ 1.0 mg/m 0.1 ~ 0.5 mg/m...

  • Page 192: Appendix D Electromagnetic Radiation

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix D Electromagnetic Radiation Appendix D Electromagnetic Radiation D.1 Introduction Base Transceiver Station (BTS) emit RF radiation (Radiation Hazard). Although there is no scientific evidence of possible health risks to persons living near to base stations some recommendations are giving below for the installation and operation of base station transceivers.
  • Page 193 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix D Electromagnetic Radiation occupational/controlled limits apply provided he or she is made aware of the potential for exposure. Uncontrolled limits are used for general public. General population/uncontrolled exposure apply in situations is which the general public may be exposed, or in which persons that are exposed as a consequence of their employment may not be fully aware of the potential for exposure or can not exercise control over their exposure.

  • Page 194: Estimation Of Exposure To Electromagnetic Fields

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix D Electromagnetic Radiation Power density [mW/cm uncontrolled area 1500 1500 D.3 Estimation of Exposure to Electromagnetic Fields Below method describes a theoretical approach to calculate possible exposure to electromagnetic radiation around a base station transceiver antenna. Precise statements are basically only possible either with measurements or complex calculations considering the complexity of the environment (e.g.

  • Page 195: Location Of Base Station Antennas

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix D Electromagnetic Radiation = Antenna gain relative to half wave dipole = Power at the antenna terminals [W] S = power density [W/m ] see also MPE Limits Note: 1mW/cm = 10W/m D.5 Location of Base Station Antennas Base stations antennas, the source of the radiation, are usually mounted on...
  • Page 196 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix D Electromagnetic Radiation Consider the trade off between large aperture antennas (lower maximum RF) and small aperture antennas (lower visual impact). Take special precautions to keep higher-power antennas away from accessible areas.

  • Page 197: Appendix E Standard Compliance

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix E Standard Compliance Appendix E Standard Compliance E.1 Um Interface　 I. Physical layer　 TIA/EIA IS-2000-2-A: Physical Layer Standard for cdma2000 Spread Spectrum Systems II. MAC layer　 TIA/EIA IS -2000-3-A: Medium Access Control (MAC) Standard for cdma 2000 Spread Spectrum Systems III.

  • Page 198: Lightning Protection

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix E Standard Compliance ITU-T G.958: Digital line systems based on the synchronous digital hierarchy for use on optical fiber cables AF-PHY -0086.001: Inverse Multiplexing for ATM(IMA) Specification Version 1.1 ATM Forum af-phy-0064.000 ATM Forum af-phy-0130.000 ATM on Fractional E1/T1, October 1999 II.

  • Page 199: Safety

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix E Standard Compliance ETS 300 253(1995) Equipment Engineering; Earthing and bonding of telecommunication equipment in telecommunication centers E.4 Safety　 IEC60950 Safety of information technology equipment Including Electrical Business Equipment IEC60215 Safety requirement for radio transmitting equipment CAN/CSA-C22.2 No 1-M94 Audio, Video and Similar Electronic Equipment CAN/CSA-C22.2 No 950-95 Safety of Information Technology Equipment Including Electrical Business Equipment.

  • Page 200: Appendix F Abbreviation

    User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix F Abbreviation Appendix F Abbreviation 3GPP2 3rd Generation Partnership Project 2 Availability A1/A2/A5 Interface between BSC and MSC A3/A7 Interface between BSCs A8/A9 Interface between BSC and PCF A10/A11 Interface between PCF and PDSN Authorization, 　...
  • Page 201 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix F Abbreviation Capability Mature Mode Core Network Central Processing Unit Cyclic Redundancy Check Common Transmit Clock Digit/Analog Digit Analog Converter Direct Current DAGC Digit Automatic Gain Control Data Communications Equipment Dual Duplex er Unit Duplex er and Filter Unit Electro Magnetic Compatibility...
  • Page 202 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix F Abbreviation IEEE Institute of Electrical and Electronics Engineers Intermediate Frequency Inverse Multiplexing for ATM Internet Protocol IPOA IP over ATM ISDN Integrated Services Digital Network Independent Transmit Clock International Telecommunications Union ITU -R International Telecommunications Union- Radiocommunication Sector ITU -T...
  • Page 203 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix F Abbreviation Power Supply Unit Permanent Virtual Channel Permanent Virtual Path Pulse-Width Modulation Quality Identification Bit Quality of Service QPCH Quick Paging Channel QPSK Quadrature Phase Shift Keying R-ACH Reverse Access Channel Rate Configuration Rate Configuration 1 Rate Configuration 2...
  • Page 204 User Manual System Description Airbridge cBTS3612 CDMA Base Station Appendix F Abbreviation VSWR Voltage Standing Wave Radio...

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