flexi bsc

1 © Nokia Solutions and Networks 20141 © Nokia Solutions and Networks 2014Confidential

Flexi BSC

2 © Nokia Solutions and Networks 2014

Flexi BSC architecture

Flexi BSC computer units and their function


RN28126EN14GLN0

BSC Product Naming

BSC = Base Station Controller, a general term for all BSC versions

General name Product name Explanation

BSCi/2i BSCi High Capacity (upgraded) version of the first generation Nokia DX 200 BSC (BSCE)

BSC2i High Capacity version of the second generation Nokia DX 200 BSC2

Flexi BSC product family

BSC3i 660 660 TRX one cabinet configuration, upgradeable to Flexi BSC ( S11.5HW)

BSC3i 1000/2000 1000 TRX one cabinet or 2000 TRX two cabinet configuration ( S12/S13HW)

Flexi BSC 3000 TRX / 4200 TRX one cabinet configuration (S14/S15/S16 HW)

• Flexi BSC product family is a general term for all versions upgradeable to Flexi BSC configuration• Flexi BSC as product name is specific for the 3000 TRX one cabinet product/configuration and more

4 © Nokia Solutions and Networks 2014RN28126EN14GLN0

Flexi BSC Cabinet Configuration Computer Units

MCMU

BCSU

OMU

MC

MU

OMU

BCSUBCSU BCSU

BCSUBCSU BCSU

Flexi BSC cabinet

In the Flexi BSC, the call control functions are executed by micro-

computers, calledCall Control Computers

MC

MU

BCSU

2000 x 900 x 600 cabinet (HxWxD)


Flexi BSC Block Diagram


Flexi BSC Cabinet Configuration

PDFU - A

GSW2KB 0 GTIC 0

GSW2KB 1 GTIC 1

ETC 0

ETC 2

ETC 1

ETC 3

CL

S 0

C

LS

1

BCSU 0

BCSU 1

LA

NU

0

BCSU 3

BCSU 5

BCSU 2

LA

NU

0

BCSU 4

BCSU 6

MCMU 0

MCMU 1

OMU

0

1

2

3

4

5

0 6

0 3 6 9

0 3 6 9

0 4 6 8

0 4 6 9

0 4 6 9

BSCC

SGC1C-A

SGC1C-A

CC3C-B CC3C-ADC3C-B

BC1C-B

BC1C-B

CARTRIDGE TYPE

CPETx CPRJ45-ACPGO / CPETx

FRONT VIEW

MC

MU

OMU

BCSUBCSU BCSU

BCSUBCSU BCSU

MC

MU

BCSU


GSW2KB-A

GSW2KB-A

GTIC-0

GTIC-1

ETC-0

ETC-2

ETC-1

ETC-3

UNIT TYPE


Flexi BSC cabinet

Flexi BSC Cabinet configuration(Other Units)

LANU

GSW2KB

GTIC

CLOC ETC

ET

C

ET

C

LA

NU

LA

NU

GT

IC

GS

WB

CL

OC

ET

C

ET

C

GT

IC

GS

WB

CL

OC


Flexi BSC Hardware and Functionality BSC peripheral options

Line Printer, LPT

• A printer can be connected to the OMU. The interface complies with the ITU-T Recommendation V.24.

• External Alarm Unit, EXAU

• The alarm lamp panel shows the BSC HW alarms and it can be installed to a place where the observations of alarms can be noticed easily.

Visual Display unit, VDU

A visual display unit is used as a user interface at BSC site. By using a VDU terminal, the user can perform normal operational functions, using MML commands and diagnostic tests on various units.


Flexi BSC Hardware and Functionality Computer Units (1/4)

MCMU

BCSU

OMU

MC

MU

OMU

BCSUBCSU BCSU

BCSUBCSU BCSU

Flexi BSC cabinet

In the Flexi BSC, the call control functions are executed by micro-

computers, calledCall Control Computers

MC

MU

BCSU



Flexi BSC Hardware and Functionality Computer Units – MCMU (Marker and Cellular Management Unit)

(2/4) • The Marker and Cellular Management Unit (MCMU) controls and supervises the Bit Group Switch and performs the hunting, connecting and releasing of the switching network circuits.

• The cellular management functions of the MCMU are responsible for cells and radio channels that are controlled by the BSC. The MCMU reserves and keeps track of the radio resources requested by the MSC and the handover procedures of the BSC.

• MCMU also manages the configuration of the cellular network.

• Redundancy 2N

MCMU

Plug-in units• CP816-AC/

CP1-D• SWPRO-C• ESB24-A• PSC6-AB

MC

MU

MC

MU


Flexi BSC Hardware and Functionality New SWPRO-C

• The SWPRO-C plug-in unit is used as a control unit for a bit-oriented group switch (GSWB).

• The GSWB control unit functionality provides two control bus interfaces through the backplane connection.

• Processor Intel Celeron 1.0 GHz, 400 MHz with SDRAM: 1 GB (with x8 memory configuration)

• SWPRO-C allows to control higher amount of connections and generates less load to the MCMU CPU in comparison to SWCOP-A

PDFU PDFU

BCSU 1

CL

S

GSW2KB

GSW2KB

CL

S

LA

NU

L

AN

U

FTRB FTRB

Flexi BSC

GTIC

GTIC

ETC

ETC

ETC

ETC

BCSU

BCSU 2 BCSU 3

BCSU 5BCSU 4 BCSU 6

FTRB FTRB

MC

MU

MC

MU

OMU

SWPRO-C


RN28126EN14GLN0

• The BSC Signalling Unit (BCSU) performs those BSC functions that are highly dependent on the volume of traffic.

• Consists of two parts, which correspond to the A and Abis interfaces

• Packet Control Units (PCUs) are housed in the same cartridge.

• The A interface part of the BCSU is responsible for performing all message handling and processing functions of the signalling channels connected to it

- Performing the distributed functions of the Message Transfer Part (MTP) and the Signalling Connection Control Part (SCCP) of SS7

- Controlling the mobile and base station signalling (Base Station Subsystem Application Part, BSSAP)

• The Abis interface part of the BCSU controls the air interface channels associated with transceivers (TRXs) and Abis signalling channels.

• The handover and power control algorithms reside in this functional unit.

• Redundancy N + 1

BCSU

Plug-in units• CP816-

AC/CP1D• AS7-D• PCU2-E• PSC6-D

BCSUBCSU BCSU

BCSUBCSU BCSU

Flexi BSC Hardware and Functionality Computer Units – BCSU (BSC SIgnalling Unit) (3/4)


Flexi BSC Hardware and Functionality New AS7-D (1/2)

- The AS7 plug-in unit function as a general purpose peripheral slot computing engine

- 512 HDLC channels (2x that of AS7-C), 8x more memory, data processing performance is estimated to be ~1.4x that of AS7-C

- an interface to OMC (X.25), then it is installed in OMU.- Processor and capacity Performance:

- Processor: Intel Celeron M ULV 1.0 GHz, 400 MHz FSB (Data quad pumped, 3.2 GB/s).- L1 Instruction cache: 32 kB § L1 Write Back Data Cache: 32 kB § L2 Cache: 512 kB

- Memory::SDRAM: 1 GB - Capacity:

§ Channels: 512§ 2M PCMs: 16 (32)

PDFU PDFU

BCSU 1

CL

S

GSW2KB

GSW2KB

CL

S

LA

NU

L

AN

U

FTRB FTRB

Flexi BSC

GTIC

GTIC

ETC

ETC

ETC

ETC

BCSU

BCSU 2 BCSU 3

BCSU 5BCSU 4 BCSU 6

FTRB FTRB

MC

MU

MC

MU

OMU

AS7-D PIU


Flexi BSC Hardware and Functionality Flexi BSC PCU Solution• Controls (E)GPRS radio resources and acts as the key unit in the following procedures

- (E)GPRS Radio resource allocation and management- (E)GPRS radio connection establishment and management- Data transfer- Coding scheme selection- PCU statistics

• Independent processing unit, embedded in BCSUs of BSC for redundancy purposes

- Takes advantage of BSCs O&M and overload protection mechanisms

• Provides flexible choices for transport method between BSC and SGSN

- IP and Frame Relay as transport alternatives for Gb – Interface


RN28126EN14GLN0

Flexi BSC Hardware and Functionality New PCU2-E

• PCU functionality in Flexi BSC can be realized by: PCU2-E

• New PCU2-E offering significant capacity enhancements:– Consist of 1 logical PCU– 1 logical PCU can handle 1024 Abis Channel @

16 Kbps– up to 5 PCU/BCSU x 6 BCSU/BSC = 30 logical

PCU/BSC => 30720 Abis channels / BSC3i 3000• If compared with PCU2-D:

– :Consist of 2 logical PCU– 1 logical PCU can handle 256 Abis Channel @

16 Kbps– In BSC 2000, the capacity =

10 (active) BCSU/BSC x 5 PCU2-D/BCSU x 2 logical PCU/PCU2-D 256 Abis Channel / logical PCU = 25600 Abis Channel

PDFU PDFU

CL

S

GSW2KB

GSW2KB

CL

S

LA

NU

L

AN

U

FTRB FTRB

Flexi BSC

GTIC

GTIC

ETC

ETC

ETC

ETC

BCSU

BCSU 2 BCSU 3

BCSU 5BCSU 4 BCSU 6

FTRB FTRB

MC

MU

MC

MU

OMU

BCSU 1

PCU2-E PIUBTS Objects TRX Objects Abis Channels

Up to 30 x 384 Up to 30 x 1,024 Up to 30 x 1,024

PCU2-E Capacity


Flexi BSC Hardware and Functionality Computer Units – OMU (Operation and Maintenance Unit) (4/4) • OMU is an interface between the BSC and a higher-

level network management system and/or the user. The OMU receives fault indications. It can produce local alarm printouts to the user or send the fault indications to NetAct

• In a fault situation, the OMU automatically activates appropriate recovery and diagnostics procedures. Recovery can also be activated by the MCMU if the OMU is lost.

• The OMU consists of microcomputers and contains I/O interfaces for local operation.

• The tasks of the OMU can be divided into five groups:

- traffic measurement functions

- maintenance functions

- system configuration administration functions

- system management functions

- LAN topology management

OMU

OMUPlug-in units

• CP816-AC

• AS7-D

• HWAT-B

• SERO-B

• PSC6-AB

Mass memory adapter:

• DCAR1-A


Flexi BSC Hardware and FunctionalityDCAR1-A Plug in Unit

USB port in DCAR1-A PIU• USB memory stick will provide

reliable means for backup copying SW and database on a transferable media in BSC

• Capacity of memory stick is 4 GB

HDSAM (contained HSD07) also in DCAR1-A PIU• Duplicated Hard disk units are

installed with carrier adapter per BSC to ensure high reliability

• Easy to change or upgrade without traffic interruption

• Capacity of HSD07 is 73 GB

LED indicator on DCAR1A :green normal operationred failure condition

Hard disk AMC front panel (HDSAM-A)

Red - out of Service

green – Power good

Blue – Hot Swap

amber – hard disk drve activity


Flexi BSC cabinet

Flexi BSC Hardware and FunctionalityOther Units (1/8)

LANU

GSW2KB

GTIC

CLOC ETC

ET

C

ET

C

LA

NU

LA

NU

GT

IC

GS

WB

CL

OC

ET

C

ET

C

GT

IC

GS

WB

CL

OC


Flexi BSC Hardware and FunctionalityOther Units – GSW2KB-A (Group Switch) (2/8)

• Conveys the traffic passing through the BSC

• Establishes needed connections to the signalling units and the internal data transmission channels

- 8Mbit/s serial connections towards ET16 via back panel

- 2 HotLinks / SW256 towards ETS2 / ETIP via front panel

• Is responsible for the submultiplexing functions of the BSC

• Characteristic of GSW2KB-A:- 2048 real PCM’s

- 16384 virtual PCM’s

- Switching on 8kbit/s level

- Max. 65536 8kbit/s channels for one SW256B

- 8 x SW256B Units

Configuration includes 8 x SW256B plug-in units


Flexi BSC Hardware and FunctionalitySW256B PIU

• The GSW2KB is a congestion-free, full availability single-step switching network based on time-space architecture.

• The maximum capacity of GSW2KB related hardware is 2048 PCM lines, which realized by having 8 x SW256B piu.

• Interfaces:

- 64x8Mbit/s serial interface OR

- 32x4Mbit/s,32 x8Mbit/s serial interfaces OR

- 64x4Mbit/s serial interface

- 4 x 2N redundant Serial Broadband Interface (SBI) 524 MBit /s for connecting the Hotlink from SET/ETIP


Flexi BSC Hardware and FunctionalityOther Units – CLS (Clock unit) (3/8)

• Clock and Tone Generator (CL3TG-UA) plug-in units generates the basic timing signals needed by the exchange, either independently or synchronized to a frame alignment signal received from the Exchange Terminal (ET) or external Frequency Standard (FS).

• Number of synchronization inputs: four from PCM (ET), and two from expernal input (FS) via connector panel

• Housed in the SGC1C-A cartridge 2 x CL3TG units(2N redundancy)


Flexi BSC Hardware and FunctionalityOther Units – SET Unit (5/8)

• Provides the external SDH / Sonet line connections for BSC

• Each ETS2 plug-in units contain two separate STM-1 / OC-3 interfaces

• Flexi BSC includes in maximum 2 x 8 ETS2 units providing 16 external interfaces (STM-1/OC-3)

• ETIP1-A/ET16 units can be equipped to the same cartridge alternatively

0 - 16 x ETS2 units0 - 16 x ETIP1-A units0 - 16 x ET16 units


Flexi BSC Hardware and Functionality Economical BSS Transmission Solutions with Integrated IP/Ethernet Interfaces

BTS BSC

TCSM

NetActTM

Abis

A

GbO&M

SMLC

Lb+MGWMSCHLR

SGSN

SIGTRAN

Ater

High availability platform with swift fault detection and hot standby units to allow minimal system downtime

All BSC interfaces are capable for IP/Ethernet connectivity with RG10

Native IP based Packet Abis and A over IP (3GPP Rel 8) with additional benefits in RG20


Flexi BSC Hardware and Functionality Other Units – ET Unit (7/8)

ETC 0-4GTIC 0-1

ETC 0-4 and GTIC 0-1 • Provides the external PCM line connections for BSC

• Each ET16 plug-in units contain 16 separate PCMs (E1/T1)

• Only one ET16 plug-in unit type• Interface specific

characteristics are changed with cabling and cabling panels

• Flexi BSC includes in maximum 50 ET16 units providing 800 external PCMs (E1/T1)


Flexi BSC Hardware and FunctionalityFlexi BSC Plug-in Units summary

New plug-in units:• ETIP1-A • PCU2-E• PSC6-D

Common units with earlier BSCproduct configurations and CoreNetwork products • DCAR1-A• HWAT-A • PSC6-AB/CB• SERO-B• HDS07-A• CP816-AC• SW256B• ET16• ETS2

Common units with Nokia Siemens Networks Core MSS, HLR, SGSN, etc.• AS7-D• SWPRO-C• ESB24• CL3TG-UA


Flexi BSC Hardware and FunctionalityHardware Changes compare to BSC3i 1000/2000

New Plug In Unit:• ETIP1-A for EET interface• PCU2-E for Packet data• PSC6-D for power supply in each• ESB24-A for ethernet switch• SWPRO-C for controlling GSWB

Common Unit:• FTRB-A enhanced fan units• CP816-A CPU for all computer units• Bit based group switch for 2048

PCMs (GSW2KB)• ET16 for E1/T1 interface• ETS2 for STM-1 or OC-3 interface• DCAR-A for mass memory• LANU• Ethernet Message Bus (EMB)

MC

MU

1 OMU

Flexi BSC cabinet M

CM

U

0

BCSU 0


BCSU 1 BCSU 3 BCSU 5

LA

NU

0

BCSU 1 BCSU 3 BCSU 5

LA

NU

1

GTIC 1GSWB

1ETC

1ETC

3C

LS

1

GTIC 0GSWB

0ETC

0ETC

2

CL

S

0

Removed Units:• ESB26 Ethernet Switch• CLAB for clock repeating

Architecture changes• 6 + 1 BCSU units • No extension cabinet

34 © Nokia Solutions and Networks 2014Confidential

35 © Nokia Solutions and Networks 2014RN2812AEN14GLN0

GPRS Soft- and Hardware requirements

- BSCi have maximal one PCU PIU per BCSU.

- BSC2i or BSC3i 660 can have optional a second PCU Plug-in-unit per BCSU.

- BSC3i 1000/2000 can have up to 5 PCU2-Ds in one BCSU

- Flexi BSC can have up to 5 PCU2-Es pplug-in unit per BCSU, as we can see on the picture.

- GPRS is supported since S9 and EGPRS since S10.5 ED Software level.

Flexi BSC cabinet



RN2812AEN14GLN0

Nokia PCU Product Family

PCU Packet Control Unit, a general term for all Nokia GSM/EDGE PCU versions

General name Name of HW product variant

Explanation

First Generation Packet Control Unit - PCU1

PCU First generation PCU for BSCE, BSC2E/A, BSCi and BSC2i

PCU-S First generation PCU for BSCE, BSC2E/A, BSCi and BSC2i

PCU-T First generation PCU for BSCE, BSC2E/A, BSCi and BSC2i

PCU-B First generation PCU for BSC3i, includes two logical PCUs

Second Generation Packet Control Unit - PCU2

PCU2-U Second generation PCU for BSCE, BSC2E/A, BSCi and BSC2i

PCU2-D Second generation PCU for BSC3i, includes two logical PCUs

PCU2-E Second generation PCU for BSC3i, includes one logical PCU


RN2812AEN14GLN0

PCU Capacity Figures

PCU-T PCU-B PCU2-D, PCU2-U PCU2-E

PQ Processor HiP4-enhanced MPC 8260APowerQUICC II Integrated Communications Processor

HiP4-enhanced MPC 8260APowerQUICC II Integrated Communications Processor

HiP7-enhanced MPC 8280PowerQUICC II Integrated Communications Processor

sRIO-enhanced MPC 8568/8567PowerQUICC III Integrated Communications Processor

Core Speed (Max) 300 MHz 291 MHz 450 MHz 1.33 GHz

CPM Speed (Max) 166 MHz 208 MHz 300 MHz 533 MHz

64bit 60x Bus Speed 66 MHz 83 MHz 100 MHz 533 MHz

32bit Local Bus Speed 66 MHz 83 MHz 100 MHz 66 MHz

SDRAM in 60x bus 256 Mbytes 256 Mbytes 256 MBytes 1 GBytes

Signal Processors 8 x TMS320VC5420 Dual-Core DSPs

= 16 DSP cores

8 x TMS320VC5420 Dual-Core DSPs

= 16 DSP cores

8 x TMS320VC5510= 8 DSP cores

6 x TMS320TCI6482 (Himalaya)

= 6 DSP cores

Frequency 100 MHz 100 MHz 200 MHz 1 GHz

Embedded memory 200 kBytes 200 kBytes 320 kBytes 512 kBytes

DSP external SDRAM No No 16 MBytes 256 MBytes

Max Connectivity

BCFs ? ? 128 512

Cells/Segments 64 64 64 256

BTS objects 64 64 128 384

TRXs 128 128 256 1024

Abis 16k sub tsls 256 256 256 1024

Abis 16k sub tsls/DSP 20 20 40 216

EDAPs 16 16 16 60


PCU-2E: Location, Front View

ZWTI:P:BCSU,<NBR>;

MML: Check HW configuration

BCSU

One PCU must be installed in every BCSU!

Serial port for Service Terminal of PCU


PCU internal :

PowerPC

ET

ETsETs

PCU

DSP1DSP

1

GSWB

DSPDSP

DSPDSP

DSP8DSP

6

Packets inTRAU frames

Packets in FR

internalbus

Mail Box

DMC bus

ETsETs

BTSs SGSN

Gb Abis

ET


Packet Control Unit General Functions

PCU provides a means to control (E)GPRS radio resources • Radio resource allocation and management• Connection establishment and management• Scheduling• Data transfer, LLC PDU handling• Coding scheme selection• Gb load sharing (uplink) and flow control (downlink)• MS uplink Power Control• Initial timing advance (uplink, downlink)• PCU status info collection - statistics


PCU2 Overview• PCU2 = 2nd Generation Packet Control Unit

• PCU2 implements both Gb and Abis (RLC/MAC) interfaces

- PCU2 transmits and receives TRAU frames to and from the Base Stations and Frame Relay packets to and from the SGSN

- PCU2 can be connected to max. 256 x 16 Kbit/s Abis channels, in 256 TRXs in 128 BTSs in 64 Cells/Segments.

• PCU2 hardware is embedded in BSCs as a plug-in unit in every BCSU (BSC Signaling unit)

- PCU2-U in BSC2i, PCU2-D (includes two logical PCU units) and PCU2-E (one logical PCU) in BSC3i

- For PCU2-D, one logical PCU unit consists of one Motorola PQII 8280 HiP7 processor and eight TI TMS320C5510 Digital Signaling Processors.

- And for PCU2-E, one logical PCU unit consists of one Motorola PQIII 8568 sRIO processor and six TI TMS320TCI6482 Digital Signaling Processors.

PCU2-E PIU


PCU2 Interfaces

PCUSIG PCI/DMC

Abis

PCU2

Gb over Frame RelayGb over IPv4/IPv6

Service Terminal


- Max 6 working BCSU’s +1 redundant BCSU

- Max 5 PCU plug-in units per BCSU (10 logical PCUs per BCSU)• 1-5 PCU-E’s

- Max number of logical PCU’s : 30

- Steps of increase of logical PCU’s• 1: 5 • 2: 10 • 3: 15 • 4: 20 • 5: 25• 6: 30

1-5 PCU2-E physical piu’s

per BCSU

Flexi BSC cabinet


PCU2 HW Installation in Flexi BSC


Speech circuits

BSC Circuit Group Full Rate

GSWB

TCSMETPCM-37

Circuit Group HS4

FR

FR

FR

HS4

TCSMETPCM-36

TCPCM-1

TCPCM-1

TCPCM-3

TCPCM-2

CCSPCM-0

CCSPCM-1

CCSPCM-2

CCSPCM-3

ET-36

ET-37


CCS7 signalling

BSSAP

SCCP

MTP

MSC

TCSM

BSC

BSSAP

SCCP

MTP


A Interface using SIGTRAN protocol stack

M3UA

IP

SCTP

Ethernet

M3UA

BSSAP

IP

SCTP

Ethernet

SCCP SCCP

BSSAP

BSC MSC

SigtranSigtran


Sigtran - Signalling over IP

Sigtran defines a standardized way of carrying any SS7 signalling over IP networksDefines retransmission and reordering functionalitiesPhysical layer can be any layer 1 technology

Ethernet/SDH/etc.

IP

SCTP

M3UA

Application

Physical layer

Transport layer

Signallingadaptation

Sigtran signalling stack

Application can be ISUP, BICC, SCCP,

etc.


IP

SCTP

Appli-cation

L1

L2

Stream Control Transmission Protocol ( SCTP)

Services by SCTP:

• provides reliable data transfer between two IP end points

• It offers acknowledged error-free non-duplicated transfer of datagrams (messages).

• Detection of data corruption, loss of data and duplication of data is achieved by using checksums and sequence numbers.

• A selective retransmission mechanism is applied to correct loss or corruption of data.


M3UA – MTP3 User Adaption Layer

Different adaptation layers possible• - M2UA (MTP2 user adaptation layer)• - M3UA (MTP3 user adaptation layer)• - SUA (SCCP user adaptation layer) M3UA supported in the 1st implementation of Rel4M3UA (MTP3 User Adaptation) provides MTP3 user adaptation for upper layers to use

IP

SCTP

SUA

TCAP

MAP

IP

SCTP

M3UA

SCCP

TCAP

MAP


Sigtran Terms and Concepts

DX200

Association Set (up to 16 associations)

SCTP Association

Signaling Link Set can only contain one "Sigtran link". "Sigtran link" consists of one SCTP association set. Association is identified by the computer unit and destination address. Only one association allowed per computer unit.

Signalling point B

IP

Signalling point A

MSC (Server) BSC (Client)

CCSU_0

CCSU_1

CCSU_2

CM

SPC_1

BCSU_0

BCSU_1

BCSU_2

MCMU

IP Addresses SPC_2

Addressing based on SPCs!


SIGTRAN vs TDM SS7


BCF

Abis-IF structure

TRXSIG BCFSIG TCHGSWET

OMU BCSU

D-BUS

BTS1+1+1BSC

BCF

Abis Structure

Abis Interfacecompressed allocation

123456789

101112131415161718192021222324252627282930

01 2 3 4 5 6 7 8

31

fixed CCITT frame dataTCH 1 TCH 2 TCH 3TCH 5 TCH 6 TCH 7

TCH 1 TCH 2 TCH 3TCH 5 TCH 6 TCH 7

TCH 4

TCH 4

TCH 1 TCH 2 TCH 3TCH 5 TCH 6 TCH 7TCH 4

TRXSIG 1TRXSIG 3TRXSIG 5

BCFSIG

1 2 3 4 5 6 7 8

1234

0 fixed CCITT frame data

BCFSIG TCH 2 TCH 3TCH 5 TCH 6 TCH 7TCH 4TCH 1 TCH 2 TCH 3TCH 5 TCH 6 TCH 7TCH 4

TRXSIG 2

TRXSIG 1

TRU

TRX-1

TRX-3

TRX-5

ET

ET

MCMU


Handover cases

MS

BTS

BSCMSC

BSC

BSC

MSC

(1)(2)

(3)

(4)


Frequency hopping

RTSL 0 1 2 3 4 5 6 7

TRX-1 f1

TRX-2 f2

TRX-3 f3

TRX-4 f4

• Synthesized Hopping:

• Base Band Hopping:

TRX-1

TRX-2

f1,f2,f3,f4,

f1,f2,f3,f4,

.....

B

B

B = BCCH timeslot. It does not hop.

Time slots 1...7 of all TRXshop over MA(f1, f2, f3, f4).This hopping group uses HSN-2.

MAIOs have to be different betweensame RTSLs in same hopping group.

0 0 0 0 0 0 0

1 1 1 1 1 1 1

2 2 2 2 2 2 2

3 3 3 3 3 3 3

0

1

2

Time slot 0 of TRX-2,-3,-4 hop over MA (f2, f3, f4).This hopping group uses HSN-1.

B = BCCH timeslot. TRX does not hop.

Non - BCCH TRXs are hopping overthe MA -list (f1,f2,f3,...,fn) attached to the cell.

fa

(fb)

(fc)

MAIOs have to be different betweensame RTSLs in same hopping group.

Only one hopping group. Only HSN-1 is meaningful.

TRX-3

0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1


Logical Channel Types

LOGICALCHANNELS

COMMONCHANNELS

DEDICATEDCHANNELS

BROADCASTCHANNELS

COMMONCONTROL

CHANNELS

FCCH SCH BCCH PCH RACH AGCH SDCCH SACCH FACCH TCH Data

DEDICATEDCONTROL

CHANNELS

TRAFFICCHANNELS

CBCH

flexi bsc

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