GSM BSS 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12
.8 .8 .8 .8 .7 .7 .7 .6 .6 .6 .6 .4
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() () GSM BASE STATION SUBSYSTEM 22 2552 20 2552
2 DIGITAL PCN 1800 15.3 . 24 30 14 2552 . 12
GSM BSS AND WCDMA GSM BSS GSM Interface, Protocols, Numbering plan, GSM Radio technologies, Signaling BTS BSC Operation and Maintenance Training Software Maintenance Software BSC6000 Software OMC Huawei Maintenance BSC PCU Operation and Maintenance PCU Data GSM WCDMA 3G Overview, CDMA principle, WCDMA Fundamental Hardware System Structure Hardware BSC BTS Huawei
3 3.1 1) 2) . GSM 3) . 4) . Mobile 3.2
GSM Base Station Subsystem1. GSM 1 3 MS (Mobile Station) (Subscriber) BSS (Base Station Subsystem) RF MS Base Band Core Network NSS (Network Station Subsystem) Circuit Switching Voice, Package switching Data Network Interconnector
1 GSM BSS BSC 1 PCU BTS Traffic Config BSC (Base Station Controller) BSS
PCU (Package Control Unit) DATA BTS (Base Transceiver Station) MS BTS BSC
2. BSS Functions BSS 2.1 Radio Resource Management (RRM) BSC functions of the BSS. RRM is the procedure through which a stable connection is established between the MS and the MSC for a call. This procedure is also used to release the radio resources when a call is disconnected. The limited radio resources must be dynamically allocated to maintain the stable connection between the MS and the MSC. The RRM is mainly performed by the MS and the BSC. In addition, the RRM maintains the channel connection when an MS is handed over to a neighbor cell. Paging This describes the paging procedure. Paging is a broadcast procedure used by the network to search for an MS. On receiving a call, the GSM/GPRS network initiates broadcasting in the location area or routing area of the paged MS. For a PS service, paging can be performed on the basis of the location area but is mainly performed on the basis of the routing area. Which area the paging is based on is determined by the SGSN. Assignment This describes the assignment procedure. Through the assignment procedure, the BSS assigns a TCH to an MS. Initial Access and Immediate Assignment This describes the initial access and immediate assignment procedures. The purpose of initial access is to set up a radio resource (RR) connection on the Um interface between an MS and the network. The purpose of immediate assignment is to assign a signaling channel for setting up the RR connection.
Authentication and Encryption This describes the authentication and encryption procedures. Authentication and encryption are two security mechanisms used by the GSM network to enhance network security and data privacy. System Information This describes system information (SI). The SI contains the main radio network parameters on the Um interface. These parameters include network identification parameters, cell selection parameters, system control parameters, and network function parameters. Handover Handover is a procedure in which a conversation can be sustained when an MS moves from one cell to another in order to meet the requirement of network management. Radio Channel Management This describes the radio channel management procedure. Radio channel management is performed by the BSC. It consists of long-term channel configuration management and shortterm dedicated channel assignment management. The long-term management function is used to select the channel sequence number and to configure relevant devices. The short-term management function is used to assign and release various channels during communication. Power Control This describes power control. Power control aims to reduce the transmit power of the MS or the BTS under the condition that the radio link quality is maintained and the power level of the MS and the BSS is met. Through power control, the system interference is reduced, the frequency spectrum efficiency is improved, and the standby time of the MS is extended. Circuit Management This describes the circuit management procedure. The BSC can manage the circuits on the A interface. For example, it performs circuit assignment, circuit blocking, circuit unblocking, circuit group blocking, and circuit group unblocking. It also operates and maintains a single circuit or the PCM group circuits of the GEIUA/GOIUA. TRX Management This describes the TRX management procedure. TRX management refers to TRX status management.
Media Access Control This describes Media Access Control (MAC). Radio Link Control This describes Radio Link Control (RLC). 2.2 Connection Management This describes the connection management of the BSS. Connection management is a function for the control, assignment, and management of the services provided by the network. The services are short message services (SMSs), teleservices, and location-based services. 2.3 BTS Management This describes the BTS management function. BTS management is a function where procedures and messages related to the BTS are performed. The procedures and messages such as the BTS software downloading, BTS data configuration, BTS status management, and BTS alarms management should be performed by the peer-layer entities of the BSC and BTS. 2.4 BSS Operation and Maintenance This describes the OM functions of the BSS. The BSS provides OM functions, such as, performance management, BTS OM, BSC OM, clock control setting, BSC alarms, BTS alarms, BTS commissioning, dynamic data configuration, GUI, and integrated network management interfaces. 3 Huawei BTS
3. Huawei Base Station SubsystemBTS Huawei GSM BTS3012, BTS3012AE, BTS3006, BTS3006A, BTS3900, BTS3900A, DBS3900 BTS 3 BTS GSM TRX Cabinet A BTS Outdoor 3.1 BTS 3012 BTS 3012 macro cell indoor TRX Cabinet 12 TRXs 1 (Site) BTS 3012 6 Cabinets TRX 72 TRXs GSM/EDGE Radio Access Network 850 MHz, 900 MHz, 1800 MHz, 1900 MHz BTS 3012
(Volume) (Coverage) BTS 3012
Power Boost Technology (PBT) TRX 100 w. TCH (sensitivity) -112.5 dBm (typical value in normal temperature). Line Clock GPS Transmissions E1, FE, T1, STM-1, microwave, and satellite Hub transmission. 3.1.1 BTS 3012
BTS3012 cabinet, antenna subsystem, OM equipment, auxiliary equipment 2
2 BTS3012 Cabinet Cabinet BTS3012 RF Signal Baser Band Signal Antenna Subsystem Uplink Downlink MS Um interface OM Equipment BTS3012 BTS3012 OM 3 Site Maintenance Terminal, Local Maintenance Terminal Network iManager
Auxiliary Equipment Power Supply Converter. Monitor, Sensor . Report alarm 220.127.116.11. Physical Structure BTS3012 TRX BTS3012 -48 V DC +24 V DC 48V DC DAFU subrack, DTRU subrack, fan subrack, common subrack, signal lightning protection subrack, transmission subrack, and power distribution unit. 1 Cabinet S4/4/4 configuration
3 Rack BTS3012
(1) Transmission subrack (2) Common subrack (3) Fan subrack (4) DTRU subrack (5) DAFU subrack (6) Power supply unit (7) Signal lightning protection subrack +24 V DC DAFU subrack, DTRU subrack, fan subrack, common subrack, signal lightning protection subrack, transmission subrack, power distribution unit 1 Cabinet S4/4/4 configuration
4 Fully configured BTS3012 cabinet (+24 V DC) (1) Power subrack (2) Common subrack (3) Fan subrack (4) DTRU subrack (5) DAFU subrack (6) Power supply unit (7) Signal lightning protection subrack
18.104.22.168 Logical Structure Logical BTS3012 Common Subsystem, signal protection subsystem, double-transceiver subsystem, RF front-end subsystem, power subsystem, environment monitoring subsystem, antenna subsystem. 5
5 The logical structure of the BTS3012. Common subsystem common subrack. clock signals BTS alarms, Abis DTMU, DEMU, DATU, DCSU, DCCU, DPTU, DABB, and DGPS. 6
6 Commom subrack DTMU (Transmission/Timing/Management Unit for DTRU BTS ) 3 Transmission Abis Timing
Management BTS active/standby 2 DEMU(Environment Monitoring Unit for DTRU BTS) Alarm Sensor smoke sensor, water sensor, temperature and humidity sensor, infrared sensor, and door control sensor DTMU slot 2, 3, 4, 7 DCSU(Combined cabinet Signal connection Unit for DTRU BTS) clock signals, data signals, control signals DTMU DTRU Cabinet Site 1 Cabinet slot 5 DCCU(Cable Connection Unit for DTRU BTS) DATU(Antenna and TMA Control Unit for DTRU BTS) RET antenna , Feeds power to the TMA ,Reports the RET control alarm signals Monitors the current from the feeder
7 Common Subsystem
Signal Protection Subsystem E1 Signal (Lightning) DMLC, DELC, and DSAC
3.2 BTS3012AE This introduces the BTS3012AE. The BTS3012AE is an outdoor macro BTS that supports the double-transceiver or multi-transceiver configuration. One BTS3012AE cabinet can provide a maximum of 12 TRXs or 36 TRXs. System Architecture The BTS3012AE system consists of the cabinet, antenna subsystem, OM equipment, and auxiliary equipment.
8 BTS3012AE Overview The BTS3012AE can be configured with the QTRU or the DTRU. The common features are as follows:
Supports the TCH/FS static sensitivity of -112.5 dBm (typical value in normal temperature).
Supports the Hub BTS function. Supports soft synchronization on the Um interface. Supports Flex Abis networking. Supports optimized Abis transmission. Supports rapid switchover of the ring topology. Supports local switching. Supports Abis over IP. Supports clock over IP.
Supports various transmission modes such as E1,