1

Basic Radio Network Architecture and O & M

2

Objective

Understand Basic Architecture of Radio Network.

Familiarize with the Interfaces of Radio Network and surrounded systems.

Realize Basic components and their Functionality.

Recognize Basic RAN KPI.

FM/PM/CM system overview for RAN.

Customer Problem Solving Case study.

Service Degradation Problem Case study.

3

RAN: Where it is located?

The interfaces between the BSC and

each NE in the GSM network are

as follows: Um Interface: the interface between

the BTS and MS Abis Interface: the interface between

the BTS and BSC ATER Interface: the interface between

the BSC and TC. A Interface: the interface between the

TC and MSC or MGW Gb Interface: the Interface between the

BSC and SGSN

RAN Location:

4

BSS Functionality:

BSC Functionality:Terrestrial Channel Management.Management of traffic channel.PagingFrequency Hopping control.BTS and MS power controlIdle channel quality monitorQuality and field strength control of active channel.HO Control.Maintenance of BTS/TC/BSC.Interface with TC/OSS/MSC/BTS/SGSN.

BTS Functionality:Timing BCCH and CCCH.Forward BTS/MS STS to BSC.Detect RACH from MS.Channel Coding/Decoding in Radio path.Encryption/Decryption on radio path.Perform FH.Modulation/Demodulation, Up/down conversation and power amplifyingTX/RX RF signal.Report Idle Channel to BSC.

TC Functionality:Converts 64-16KBPS and vice versa.Process CS services and perform the voice coding and decoding function Provides the Tandem Free Operation (TFO)

function Provides the voice enhancement function

TRU Functionality:Provides Um interface.Reallocates Traffic and control channels

PCU Functionality:Process PS service.PDCH Channel management.

5

BSC Basic components:

Subsystems Under BSC:Interface Board System. Service (PS/CS)Processing Subsystem.Switching Subsystem.Clock Subsystem.O&M Subsystem.

Interface Board Systems:•Provides E1/STM/FE/GE interface towards connected interface (GB/ABIS/A/ATER).

Switching Subsystem:•Provides intra-subrack Medium Access Control (MAC) switching •Provides intra-subrack Time Division Multiplexing (TDM) switching •Distributes clock signals to the service processing boards•Provides inter-subrack switching •Provides switching channels for traffic data •Provides OM channels

Service Processing Subsystem:•User data transfer •Radio channel ciphering and deciphering •System admission control •Data integrity protection •Mobility management •Cell broadcast service control •Data volume reporting •Radio access management •CS service processing •PS service processing •Radio resource management and control •System information and user message tracing

O&M SubSystems:Performing the configuration management, performance management, fault management, security management, and loading management functions for the system

Clock Subsystem:•Provides synchronous timing signals for the system

6

Huawei BSC Subsystems:

Huawei BSC Subsystems:Interface Board System. (EIU/OIU) Service (PS/CS)Processing Subsystem. (XPU/DPU)Switching Subsystem.(TNU/SCU)Clock Subsystem.(GCU/SCU)O&M Subsystem.(OMU)

7

NSN BSC Subsystems:

NSN BSC Subsystems:Interface Board System. (ET/STMU) Service (PS/CS)Processing Subsystem. (BSCU/MCMU/TR3T)Switching Subsystem.(GSW/MCMU)Clock Subsystem.(CLS)O&M Subsystem.(OMU)

8

Ericsson BSC Subsystems:

Ericsson BSC Subsystems:Interface Board System. (ET) Service (PS/CS)Processing Subsystem. (RPG3/RPP/CSPB)Switching Subsystem.(XDB/DLEB)Clock Subsystem.(IRB/CGB/CDB)O&M Subsystem.(APG)

9

BTS Basic components:

BTS Components: Physical Component•System Module (TMU/ESMA)•Transceiver Module (TRU/TRX/GTRU/DRFU)•Combiner (Optional) (CDU/DDPU)•Environment Monitoring Unit. (EMU)

Logical Component:•Cell•TRX

10

GPRS System Architecture:

11

GPRS Interface:

12

GPRS MS:

13

PS Coding Scheme:

14

Logical Channels:

15

Logical Channels:

16

Use of Logical Channels:

17

Physical Channels:

18

Physical Channel Alignment:

19

Physical Channel Alignment:

20

Packet Logic Channel:

21

Packet Channel Configuration:

22

Packet Radio Channel Mapping:

23

Wireless Packet Resource Allocation:

24

RAN Basic KPI:

CS Domain:Accessibility -IASR -SDCCH Congestion Rate -SDCCH Call Drop Rate -TCH ASR -TCH Congestion Rate -CSSR -Paging Overload

Mobility -HOSR

Receive Quality -RX Qual DL/UL

Retain ability -TCH Drop Rate -CCSR

Resource Utilization -TCH/SDCCH Availability -TCH Erlang -SDCCD Erlang -TRX Usability

PS Domain:Accessibility -UL/DL ASR -UL/DL TBF ASR -UL/DL TBF Congestion Rate

Throughput -UL Data Throughput -DL Data Throughput

Delay -Ping Delay -PDP Activation Delay -Attachment Delay -Cell Reselection Times

Retain ability -UL/DL TBF Drop Rate

Resource Utilization -UL PDCH Utilization Rate -DL PDCH Utilization Rate -PDCH Occupation Rate

25

RAN FM:

Fault Management System

Active AlarmHistory AlarmCustomized AlarmAlarm ReportingAlarm Notification

Alarm Type:

Device Alarm (HW/ENV/COM) -Fan Box AlarmTransport Alarm -E1/T1 Loss of SignalService Alarm (QoS/Running/SW/Signaling) -GSM Cell Out of ServiceEvents

26

RAN CM:

RAN Subsystem and Parameters configuration (BSC/BTS/TRX/Channels)

BSC/BTS/TRX Software loading/updating

BSC/BTS/TRX Maintenance.

Authentication/Security/Log Management

Centralized CM system (CME, LMT, OM Editor)

MML/GUI capable LMT for configuration(Reflection/Huawei Web LMT)

Powerful tools for effective/fast/easy configuration (CME)

Intelligent CM tools (Consistency Check Tool/Rehome tool)

27

RAN PM:

Counter, Object, Period (What/Who/When)

All KPI is measured in BSC and sent to OSS.

All the Counters are realized in different types (HW/RAN/TX) and are accumulated to generate predefined/Customized KPI.

Accessibility/Retain ability/Resource Utilization KPIs are measured in both CS/PS Domain to understand Network Experience.

More raw counters/KPIs can be correlated for analysis/RCA and Customer Problem Solving.

But the Challenge is to correlate FM/PM/CM events!!!!

28

RAN Parameters:

•Network Identity Parameters (CGI/BSIC)

•Idle Mode Parameters (ATT, CCCH_Conf,BS_AG_BLKS, MFRAMES,T3212, Paging Times)

•Call Control Parameters (MaxRet,RLT,TX-Integer,ECSC,EC,MBR, Access Class, NCC Allowed, SACCH Multi-Frames, Max TA, T200 and N200, TCH immediate assignment, Direct Retry, )

•Cell Selection and Reselection Parameters(RxLevel Acc Min,CBA,CBQ,CRH,TO,PT,PI)

•Other Parameters

29

RAN Parameters:

30

RAN Features:

31

Service Degradation Analysis:

32

Questions/Answer

??Questions/Answer??

33

Thanks for attending!