OSS-RC 3G EricssonOverview

Kira-kira begini kali ya kalo kita sempet ngerjainnya Source :

- Active Library Explorer (ALEx)- Our own memoriesChapter :

- Short description about 3G Network Architecture- Short explanation about Hardware per Radio Network Elements (NEs) :* RNC (Radio Network Controller)* RBS/Node B (Radio Base Station)* RXI (Radio access network aggregator)* OSS-RC (Operations Support System Radio & Core) - OAM OSS-RC (Operation and Maintenance OSS-RC)- Suggestion of Operational Procedure OMC-3G, include :* Fault Management* Configuration Management (probably next time )* Perfomance Management (definitely next time, I think )Discussion (managed to compile FAQ document)

Network Architecture

The WCDMA RAN consist of the following main parts :RNC

Provides WCDMA resource management, telecom functionality and O&M processing RBS

Provides radio channel function, air interface management, cellular transmission management and O&M processingOSS-RC

The OSS-RC is a software package for handling RAN O&M tasks. OSS-RC gives a consolidated view of RAN information such as alarms,configuration, and basic performance. OSS-RC also provides several interface for integration with an existing network management environment.

Network Architecture - interfaces

CN (Core Network)

commoncs & psnetwork elementscircuit switched (cs) domainpacketswitched (ps) domain3GMSC/VLR3GSGSN

UTRAN (UMTS Terrestrial Radio Access Network)

RNCRNCRadio Network ControllerUEUser Equipment = Mobile Equipment (ME) + Universal SIM (USIM)RNCRBSRadio Network Subsystem (RNS)Radio Network Subsystem (RNS)IubIurIu-PSIu-CS

UuUuUEUEEIRHLRACRBSRXIRBSRBSIub

OperationSupportSystemOSS-RCMurMutMub

RNCKeterangan :A = (CUs)B = Extension Subracks (ESs)C = Main Subracks (MSs)D = Interface Connection Field (ICF)

RNC - HardwareConsist of one or two cabinet :

- Main Cabinet- Extension CabinetEach cabinet contains one to three sub-racksFor each connection between a UE and the UTRAN, an RNC can act either as a Serving RNC (SRNC) or a Drift RNC (DRNC) :A single SRNC controls all radio connection between UE and UTRAN. The SRNC terminates the Iu interface for this UE.A DRNC supports the SRNC with radio resources when the connection beween the UTRAN and the UE need to use one or more cells controlled by this RNC.

RNC Services and FunctionsRNC Represents High-Level UMTS services :Mobile telephony (voice)Unrestricted digital informationPacket data, including HSDPAShort Message Service (SMS)Mobile Positioning and LocalizationChipering (security)

RNC provides end-user functions as follows :Radio Access Bearer (RAB) service,establishment,release, modification,identification,coordination, and maintenanceMobility within UTRAN

Others function and services :O&M radio networks and transmission services

CUThe CU receives -48 Vdc power supply, which power the RNCThe CU ensure that the RNC remains in operation during any short transient power fluctuation.The CU smooth out irregularities in the power supply, and each unit is devided into three electrically separated sections able to interface high ohmic power plantsThe CU is duplicated to provide redundancy

RNC Subracks and modules

RNC Main Sub-rack

Main Sub-rack FunctionTermination of Mur interface with OSS-RCTermination of Iu interface with the CNTermination of Iur interface with another RNCTermination of Iub interface with the RBSsExternal transmission interfacesAttachment of syncronization sourcesDuplicated non-blocking ATM switchDuplicated high speed link to interconnect with the ESsDuplicated timing signals for the nodeInput for GPS signalsPool of processors for user plane processing and control

RNC Extension Sub-rack

Extension Sub-rack FunctionTermination of the Iub interface with the RBSsExternal transmission interfacesDuplicated high-speed links between sub-racks and the MSDuplicated non-blocking ATM switchPool of processors for user plane processing and control

External InterfacesThe RNC is connected to the outside world through the Iu, Iur, Iub, and Mur interfacesBesides the interfaces, the RNC also provides a Visual and Mechanical Interface (VMI) comprising indicators, swithes, buttons, cables, and so on.A GUI for O&M uses Mur

RNC Modules DetailsGPB = General purpose Processor BoardSCB = Switch Core BoardSXB = Switch Extension BoardTUB = Timing Unit BoardSPB = Special purpose Processor BoardETB = Exchange Terminal BoardDB = Dummy BoardFU= Fan Unit

General purpose Processor BoardThe GPB operates as a Main Processor (MP)It contains and executes the main part of the RNC softwareThe GPB is duplicated to provide redundancy In case of failure in the active MP, the other GPB (standby) can be started and take over as MPThe GPB is equipped with Ethernet and asynchronous serial interfaces accessible from the board front panel.The GPB also contains a flash disc drive

Switch Core BoardATM switch core functionalityCircuits for System Clock (19,44 MHz) distributionInterfaces that allow connection of four node-internal links at configurable ratesInterfaces providing connection of fan supervision signalsPower filtering and distributionThe SCB is duplicated to provide redundancy

Switch Extension BoardThe SXB is only contained in the MSHandles the interconnection of switch modules at the space switching layerThe SXB includes interfaces that allow connection of three to four node-internal link at configurable rates (up to 310 Mbps)

Timing Unit BoardThe SXB is only contained in the MSGeneration of references timing signalsRegeneration of references timing signalsStabilization of references timing signalsHandling of node syncronization proceduresSystem Clock oscilator (19,44 MHz)The TUB is duplicated to provide redundancy

Special purpose Processor BoardThe SPB has three or five processors with different application software modules depending on SPB typeEach processor has one of the following application loaded :

Packet Data Router (PDR)Common Channel over IurCommon ChannelDedicated Channel

Exchange Terminal BoardATM Adaptation Layer type 2 Multiplexing and DemultiplexingATM LayerPhysical layer and interface adaptationThe following are different versions of the ETB that implement adaptation to different physical media :

1.5 Mbps (JTI.431-a), electrical link ETB-M12 Mbps (E1), electrical link ETB-M1155 Mbps (STM-1), optical link ETB-M4

Fan UnitA Fan Unit (FU) is situated over each sub-rack and provides cooling air throughout the cabinetThere is redundancy in FUsIf one of two fans in the FU stop working, the other one starts to resolve at a higher speed

Interface Connection FieldThe ICF at the bottom of the cabinet holds connection for transmission and local O&MOther connection comprise grounding and power connections situated at the top of cabinet

Sistem Operasi : SunOSAplikasi : OSS Ericsson version: R4T