GSM BSS G10 BSC Operation and Configuration_Part 1

GSM BSS G10 BSC Operation and Configuration

Dmytro Chystyakov August 2013

BSC, TRC, BSC/TRC TRC The Transcoder Controller (TRC) node contains the pooled transcoder resources and is a stand-alone node. The TRC node requires its own AXE hardware platform components such as APZ, IO and APT, as well as the transcoder hardware. The TRC is connected to the MGW via the A-interface and to the BSC via the Ater-Interface. The TRC node has the ability to support up to 16 BSCs over the Ater interface.

BSC The stand-alone BSC is developed and optimized opti mized especially for rural and suburban areas and is a complement to the BSC/TRC node in the BSC product portfolio. The BSC contains the SRS and the TRH. It requires its own AXE 810 hardware platform components, such as APZ, IOG or APG, APT. The BSC does not contain contai n any transcoders. It utilizes transcoder resources from a cen tral BSC/TRC or from a TRC node. The BSC is connected conn ected to the BSC/TRC or TRC via the Ater interface. It can be remote controlled from the OSS.

BSC/TRC The BSC/TRC is a combined BSC and TRC node. The transcoders are set up on a per call basis, which implies a more efficient use of the transcoder resources. The BSC/TRC is capable of handling handli ng 4095 TRXs.

BSC, TRC, BSC/TRC TRC The Transcoder Controller (TRC) node contains the pooled transcoder resources and is a stand-alone node. The TRC node requires its own AXE hardware platform components such as APZ, IO and APT, as well as the transcoder hardware. The TRC is connected to the MGW via the A-interface and to the BSC via the Ater-Interface. The TRC node has the ability to support up to 16 BSCs over the Ater interface.

BSC The stand-alone BSC is developed and optimized opti mized especially for rural and suburban areas and is a complement to the BSC/TRC node in the BSC product portfolio. The BSC contains the SRS and the TRH. It requires its own AXE 810 hardware platform components, such as APZ, IOG or APG, APT. The BSC does not contain contai n any transcoders. It utilizes transcoder resources from a cen tral BSC/TRC or from a TRC node. The BSC is connected conn ected to the BSC/TRC or TRC via the Ater interface. It can be remote controlled from the OSS.

BSC/TRC The BSC/TRC is a combined BSC and TRC node. The transcoders are set up on a per call basis, which implies a more efficient use of the transcoder resources. The BSC/TRC is capable of handling handli ng 4095 TRXs.

APZ Control System

Central Processor, CP The CP has the most processing capacity in the AXE. It is responsible for all high-level functionalities, like the analysis of telephone numbers and processing of charging information. The call setup procedure is one of the main tasks controlled by the CP.

Regional Processor, RP The RP is responsible of controlling all hardware located in the APT switching part of AXE. The RP also off-load the CP with simple routine tasks and administrative operations.

I/O System The main task of the I/O system is to connect the user to the AXE in form of Alphanumeric Terminals, Alarm panels and External Media. The e xamples are: IOG 20, APG 40 and APG43.

APT Switching System Group Switch, GS The GS is the heart of the AXE. It is responsible for switching of calls, connection of APT equipment and synchronization both internally and externally. The GS is implemented in the XDB boards.

Exchange Terminal, ET The ET connects traffic links to the AXE. There are a lot of different standards for these links where STM-1 (155 Mbit/s) and E1 (2 Mbit/s) are the most c ommon.

Signaling Terminal, ST The signalling terminal is used to communicate with other nodes over signalling links.

Subscriber Equipment The subscriber equipment is used to connect subscribers to the AXE. It can for example be a radio base station (RBS) in GSM, an ENGINE Access Ramp (EAR) for local fixed subscribers or a PABX for Enterprise subscribers. This is not considered to be a part of the AXE.

APZ APZ 212 30 - High Capacity Version The high capacity processor is housed in a double depth cabinet. It supports serial RP-bus, parallel RP-bus, or both. The memory in the processor is scalable to a maximum of 4 GW DS. The BSC uses DRAM memory. PS and RS are not scalable.

APZ 212 33 The APZ 212 33 supports serial RP-bus, parallel RP-bus, or both. The RP's can be spread over max 32 RPB branches, each handling max 32 RP's. The DS is scalable (dimensionable) in steps of 512 MW using DRAM based boards. PS and RS are not scalable.

APZ 212 33C - Compact Version APZ 212 33C is the single magazine version of the APZ 212 33, called Compact Version. The CP of APZ 212 33C has about 5 – 6% less real time capacity compared to the APZ 212 33 CP. It supports serial RP-bus, parallel RP-bus, or both. Support for IPN, up to 960 RP on serial RPB, 96 MW PS, 4 GW DS (DRAM memory only), size reduced to one magazine, power consumption reduced to about 200w.

APZ APZ 212 55 APZ 212 55 is based on Generic Ericsson Processor board (GEP) and consists of two different components: two CP boards (CPUB) running the A and B side and one Maintenance Unit Board (MAUB). APZ 212 55 is placed in the same eGEM magazine as APG 43. The computational capacity of APZ 212 55 is at least the same as APZ 212 33c. The processor is equipped with either 4 GB or 8 GB memory. For a node equipped with 4 GB memory, 128 MW16 is reserved for PS and 862 MW16 for DS. For a node equi pped with 8 GB memory is 128 MW16 for PS and 2902 MW for DS. Only Ethernet based RP bus (RPB-E) is supported to communicate with the RPs in new deliveries.

APZ 212 60C The APZ 212 60C is an evolution of the APZ 212 55 architecture. APZ 212 60C is based on Generic Ericsson Processor board (GEP) and consists of two different components: two CP boards (CPUB) running the A and B side and one Maintenance Unit Board (MAUB). APZ 212 60C is placed in the same eGEM magazine as APG 43/2. The computational capacity of APZ 212 60C is higher than APZ 212 55. The processor is equipped with 8 GB memory, 128 MW16 is reserved for PS and 2.2 GW for DS.

APG (I/O System) APG40 The APG40 is a high capacity IO system for AXE exchanges. It is based on a standard Windows 2003 Server platform. APG40 supports protocols for external interfaces such as TCP/IP, Telnet (remote login), FTP (file transfer) and RPC for message transfer. The APG40 is housed in a full width BYB 501 magazine. The basic HW configuration is a 10-slot node comprising the two APG40 nodes (one active, one standby), 54 GB of mirrored Hard Disk and a DAT unit.

APG43 APG43 is based on Generic Ericsson Processor (GEP) HW and consists of four different components: two APUB running the redundant AP, two disc cards one external media and one alarm panel.

APG43/2 APG43/2 is based on Generic Ericsson Processor (GEP) HW and consists of four different components: two APUB2 running the redundant AP, two disc cards one external media and one alarm panel. APG43 (43/2) is placed in the same eGEM magazine as APZ 212 55 or APZ 212 60. APG43 (43/2) is a based on Windows 2003 server as APG40.

APZ 212 33C and APG40C/2 (C/4)

APZ 212 55 and APG43

Interfaces Serial RP Bus - RPB-S The communication between the CP and RPs are transported over a dedicated serial interface. There are cables from the RPH in the CP to two RPs in each magazine. Through these RPs the bus is also available in the backplane of most magazines.

IPN The IPN is a 100Mbit/s interface between CP and AP which is based on Ethernet. It is realized as an optional board in the RPH magazine and can be used by APZ 212 30.

IP/Ethernet LAN The optional BSC LAN switch provides traffic separation and routing environment for BSC applications shielding the internal Ethernet communication from the external IP communication. The magazines that house RPs running the GPH application or the PGW application are connected individually or in cascade to the LAN switches. The connection is done with external cabling from the magazine Ethernet switch or a GESB placed in the magazine to the LAN switch. Other applications or modules that are connected to the LAN switch are APG, STOC and SIGTRAN.

Interfaces Maintenance Bus The maintenance bus is housed in the backplane of all BYB 501 magazines. It is managed by RPs adapted to the serial RP bus. The functionality provides possibility for the system to get information of board identity, version of HW and also to indicate status of the board by controlling the MIA LED (Manual Intervention Allowed Light Emitting Diode) placed at the front of the boards.

Ethernet Backplane Communication A duplicated Ethernet bus in the backplane is used in the magazines for communication between the RP and the Ethernet magazine switches. In the GDDM-H type of magazine the Ethernet switch is called EPS/EPSB in the GEM type of magazine the Ethernet switch is integrated with the SCB-RP. The communication between different magazines is either done with cables directly connecting the magazine switches or through GESB with external cabling.

Interfaces DL34 Interface The DL34 interface is a backplane interface, optimized for communication between the GS890 and the various high-speed devices. Capacity is variable between 128 and 2688 time slots, in step of 128 time slot. Variable capacity of DL34 makes it possible to get maximal utilization of the GS890. It is achieved by mixing of high, low and medium capacity devices in the GEM, without wasting of the Group Switch capacity. Physical bit rate is 222.22 Mbit/s.

DL3 Interface This is the internal GSS interface which is used to interface the group switch (TSMs) with either subrate switch or DLHBs in GDM/GDDM type magazines. The interface is a redundant high speed interface and serves 512 MUPs (logically 16 DL2 interfaces).

DL2B Interface DL2B interface is the DL2 interface housed i n the backplane of GDM/GDDM type magazines.

Interfaces

AXE 810 Group Switch - GS890 The GS890/CL890 switch has a distributed architecture with the switc h boards residing together with clock and device boards in a Generic Ericsson Magazine (GEM). The switch capacity is 16 kMUPs per switch board and GEM. The GS890 switch can be used for subrate, together with normal rate, with a maximu m capacity of 128 kMUPs. Extensions can be made in steps of 16K in this mode. The GS890 switch is plane duplicated with both planes contained in the same magazine. A GEM is always equipped with two board types: 2 XDB (one for each plane) and 2 SCB-RP (one for each plane). The CLMs are also duplicated, each CGB compris ing two oscillators. If more than one GEM is used, the CGBs are placed in different GEMs. The interface between the Group Switch and devices in the GEM is provided by the DL-34, which offers variable capacity from 128 MUPs up to a maximum of 2688 MUPs, in steps of 128 MUPs. Devices residing in GDM magazines that do not support the DL-34 interface may be connecte d using a duplicate DLEB board. Each pair of DLEB boards has sufficient capacity for connection of up to four GDM magazines, i.e., four DL-3 interfaces.

GEM, eGEM, eGEM2 GEM GEM in its basic configuration contains two duplicated 16 kMUPs Group switch units per magazine plus a pair of regional maintenance processors. The GEM provides physical space for up to 22 different devices such as: TRA, ET155, SCB-RP, XDB, DLEB, CGB, IRB, LRB and CDB. The RP Bus and a 100 Mbit/s Ethernet are connected to each physical slot of the GEM magazine.

eGEM - Evolved GEM eGEM Evolved Generic Ericsson Magazine is based on the present GEM with addition of 10G Ethernet interfaces, Intelligent Platform Management Interface (IPMI) and Telecom Synchronization signal distribution. It is possible to use units designed for GEM in eGEM but there are some limitations. Some boards designed for GEM are not fully eGEM compliant these limitations are well documented.

eGEM2 - Evolved GEM 2 eGEM2 Evolved Generic Ericsson Magazine 2 is based on the present eGEM. eGEM is always equipped with two Switching Distribution Boards (XDBs), one for each switching plane, and two SCXB (Main Switch Board). There are also two slots reserved for future. In addition to these 22 device boards can be housed.

GEM, eGEM, eGEM2 GEM 0-2     P     R       B     C     S

bus 11

    B     D     X

    B     D     X

    4       M     X

    5       M     X

    2     5     3

    4     5     3

    6     5     3

0

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xm-0-2SLOTNO

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    B     G     C     0     9     8     L     C

    5     5     3

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    P     R       B     C     S

    3     5     3

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GEM 0-1     P     R       B     C     S

    B     D     X

    2     9     1

    4     9     1

    6     9     1

0

1

2

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1

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xm-0-1SLOTNO

    B     D     C

    1       M     L     C

    2       M     X

bus 6

    B     D     C

    8     9     1

    0     0     2

    2     0     2

    8     0     2

    0     1     2

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    P     R       B     C     S

    3       M     X

    4     0     2

    6     0     2

    4     1     2

    7     9     1

    9     9     1

    1     0     2

    3     0     2

    5     0     2

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GEM 0-0     P     R       B     C     S

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    0     6     1

    2     6     1

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xm-0-0SLOTNO

    B     D     C

    0       M     L     C

    0       M     X

bus 5

    B     D     C

    6     6     1

    8     6     1

    0     7     1

    6     7     1

    8     7     1

    B     D     X

    P     R       B     C     S

    1       M     X

    2     7     1

    4     7     1

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SCB-RP, SCXB, XDB Maintenance Processor Board - SCB-RP The SCB-RP controls the GEM magazine. This board takes in, filters and supervises the 48V. It also supervises the Maintenance Bus and distributes the control bus from CP. Maintenance Processor Board - SCB-RP/3 SCB-RP/3 provides the same functionaliy as SCB-RP and in addition it also acts as an GEM magazine Ethernet switch and provide accessibility to up to 26 boards via 10/100BaseT and provide external Ethernet switch accessibility one 1000BaseT and two 10/100BaseT. Maintenance Processor Board - SCB-RP/4 SCB-RP/4 controls the eGEM magazine, but can also be used in an GEM magazine. It provides the same functionaliy as SCB-RP and in addition it also acts as an GEM/eGEM magazine Ethernet switch and provide accessibility to up to 26 boards via 10/100/ 1000BaseT and provide external Ethernet switch accessibility six 10/100/1000BaseT. Maintenance Processor Board - SCXB SCXB controls the eGEM2 magazine. It provides the same functionaliy as SCB-RP and in addition it also acts as an eGEM2 magazine Ethernet switch and provide accessibility to up to 30 boards via 10/100/1000BaseT with autonegotiation and provide external Ethernet switch accessibility four 10/100/1000/10000BaseT and two 10/100/1000BaseT ports in the front.

CGB, CDB, IRB, GARP-2, XDB Clock Generation Board - CGB CGB generates Clock and Synchronization signal to the switch. Two CGBs are housed in the same GEM, in case of one GEM configuration (16 kMUPs). If the switch size is bigger than 16 kMUPs the CGBs are housed in different GEMs in order to improve the reliability of the system. Clock Distribution Board - CDB The CDB distributes clock and synchronization to the switch. It is necessary if the switch is bigger than 16 kMUPs. Incoming Reference Board - IRB The IRB receives three external synchronization references that are terminated, converted and distributed to the CGBs. GARP-2 The Generic Application Resource Processor ver. 2 (GARP-2) is connected to the DL34 interface in the backplane. GARP-2 has two Gigabit Ethernet interfaces in the backplane and two on the front. Following applications are using GARP-2: GPH, TRH, PGW, AGW Distributed Switch Board - XDB XDB is 16 kMUPs switch board with switching and DLMUX functions.

GESB, PGWB, STEB, BSC NIE GESB Gigabit Ethernet Switch Board GESB is a Gigabit Ethernet switch, able to handle inter communication between GEM magazines as well as communication to GEM-external stations. GESB provides eight 1000Base-TX ports towards the front. PGWB Packet Gateway Board PGWB is an Inter-Working Unit between the IP Ethernet interfaces and the GSS. Two 100Base-TX Ethernet ports are provided to the backplane. The DL34 interface is provided to the backplane. DL34 is the interface between PGWB and XDB. STEB The STEB implements signalling terminal (ST) functionalities of No. 7 signalling using Nb and HSL protocol in AXE 810 system. The protocol layers implemented on STEB are MTP1 and MTP2 for Nb and HSL Q.703 Annex A or SAAL for HSL (ATM based). STEB supports up to: 4 HSL links or 128 Nb signalling links. BSC Network Interface Ethernet The BSC NWI-E 450A is a single-slot width board L2/L3 switch for the BSC. The NWI -E 450A are housed in a GEM or eGEM magazine. Two NWI-E 450A boards are used to provide redundancy. The NWI-E 450A provides a VLAN environment for BSC modules that uses IP over Ethernet communication.

TRA TRA R6 (CSPB 1.0) TRA R6 is a CSPB 1.0 based application. It supports all codecs used in GSM system, i.e. EFR, FR, HR and Adaptive MultiRate codec (AMR) HR & FR. It also supports TFO for EFR, AMR-FR and AMR-HR. The TRA R6 is built in a DSP ASIC technol ogy developed especially for speech processing. This results in the ability to handle 192 speech channels per board, small size and low power consumption. When TFO is used the channel density is reduced to 128 channels per board for narrowband codecs. It is con nected to the Group Switch via a DL34 interface and is controlled by the APZ via an on-board regional processor (RPI). TRA R7 (CSPB 2.0) TRA R7 is a CSPB 2.0 based application. It supports all codecs used in GSM system, i.e. EFR, FR, HR and Adaptive MultiRate codec (AMR) HR & FR & WB. It also supports TFO for EFR, AMR-FR, AMR-HR and AMR-WB. The TRA R7 is built in a DSP ASIC technology developed especially for speech processing. This results in the ability to handle 384 speech channels per board, small size and low power consumption. Compare to TRA R6, the channel density is not reduced when running TFO for narrowband codecs. It is connected to the Group Switch via a DL34 interface and is controlled by the APZ via an on-board regional processor (RPI).

ET155-1, DLEB ET155-1 STM-1 ET155-1 STM-1 is a 155 Mbit/s STM-1 Exchange Terminal that can terminate up to si xty three 2 Mbit/s PDH tributaries. It supports ETSI standards. The ET155-1 STM-1 is a si ngle board implementation (two boards if protection is required) that is mounted in the GEM magazine. A maximum of 8 fully utilized ET155-1 and 8 standby (protection) ET155-1 can fit into a GEM magazine when using fully equipped STM-1 frames. For non-fully util ized STM-1 frames, a maximum of 22 ET-155-1 can be placed into the GEM magazine. In any case, the limitation is 16k ports and 22 board positions. The ET155-1 is connecte d to the Group Switch via a DL34 interface and is controll ed by the APZ via an on-board regional processor (RPI). Digital Link MUX for Existing Equipment Board - DLEB DLEB is a DLMUX that demultiplexes DL34 to DL3. One DLEB can handle four DL3 cables from GDM magazines and one DL3 cable from ET155-7 for LOT protection. (The DL3 cable for LOT protection is not used under normal conditions. It is connected to the same TS4B used by the other four DL3. If a fault occurs this DL3 is electrical inserted by a three-state connector. No manual intervention is needed.) There is one DLEB for each plane. The two DLEBs for plane A and B are placed in the slots 11 positions apart.

GDM, GDDM Duplicated DLHB boards and an RP-pair are housed in each magazine. DLHB converts one DL3 interface to 16 DL2B interfaces, where the DL2B interface is a DL2 interface adapted for the backplane. DL3 is the interface used between TSM and GDM/GDDM type magazines. The GDDM magazine also includes a duplicated Ethernet bus in the backplane.

GDM-H, GDDM-H GDM-H (Generic Device Magazine for Half Sized Boards) One duplicated DL3 interface (one for each plane) is handled. One RP pair and duplicated DLHB are housed in the magazine. The devices adapted to this type of magazine are ETC5, ETC-T1H, RPG2 and RPG3.

GDDM-H (Generic Device Datacom Magazine for Half Sized Boards) One duplicated DL3 interface (one for each plane) is handled. One RP pair and duplicated DLHB are housed in the magazine. The magazine is also equipped with duplicated Ethernet Packet Switch Board (EPS or EPSB). The device adapted to this type of magazine is RPP. Also note that any devices adapted to GDM-H can be fitted in this magazine .

RPG2/RPG3 RPG2 RPG2 is an RPG adapted for BYB501 practice, i.e. GDM-H, DL2B and serial RP-bus. The half size board requires 40 mm spacing, which means that every second device slot is used. Each board handles one DL2. The RPG2 is used as a platform for TRH, No. 7 and STC. RPG3 Regional Processor with Group switch Interface (RPG3) is a one board, plug in unit, adapted for BYB501 practice and located in GDM-H magazine. It supports regional processing and communication between the Central Processor (CP) in AXE and the remote devices through the Switching Network Terminal/Digital Link, variant 2 (SNT/DL2) interface. The RPG3 is the successor to the RPG2, which means that only the Serial Regional Processor Bus (RPB-S) is supported. All interfaces toward the application in RPG2 are still intact in RPG3. The RPG3 provides an Ethernet interface, that can be used for connection to external equipment. There are also maintenance bus and test interfaces. The RPG3 has significantly higher performance than RPG2, which means it has higher processing capacity and higher memory capacity. It also contains 8 MByte of flash PROM. The RPG3 is used as a platform for TRH, No. 7, STC and STOC applications.

RPP RPP The RPP is based on Power PC hardware platform. The RPP is a half size board with double width, it is of the same size as an RPG2 board. A fully equipped GDDM magazine can house up to 7 RPPs. A fully equipped GDDM-H also include two Ethernet Packet Switch Boards (EPS or EPSB). The duplicated switch boards allow the RPPs to use the Ethernet bus The RPPs are used to run the GPRS Packet Handler (GPH), High Speed Signalling Link (HSL). The RPP boards used for GPRS Packet Handler (GPH) implements the RP part of the PCU functionality which gives the BSC GPRS functionality. The GPH application is distributed over several RPPs and use Ethernet for RP-RP communication and functional distribution. The Gb and GSL interfaces are terminated in the RPPs. The RPP boards used for the High-speed Signalling Link (HSL) can administrate one high speed signalling link each. It is recommended to have at least two HSLs in the BSC working side by side for redundancy reasons. Each HSL occupies a full 2 Mbit/s link. The maximum number of HSL which can be used is 16.

Flow of CS Traffic/Signalling and PS Traffic/Signalling in the BSC/TRC.

RBS

RBS2000/RBS6000 DXU Distribution Switch Unit

ACCU/DCCU AC/DC Connection Unit

PSU

DUG Digital Unit GSM

RUS (MCPA) Power Supply Unit

CDU Combining and Distribution Unit

IDM Internal Distribution Module

Radio Unit all Standards (Multi Carrier Power Amplifier)

RBS

RBS MANAGED OBJECTS (MO) An MO is a logical representation of hardware units and software in the BTS. However, hardware units may actually be shared between MOs of different classes. These classes include: • Transceiver Group (TG) • Central Function (CF)

The CF is the control part of a TG. It is a software function, handling common control functions within a TG. There is one CF defined per TG. • Concentrator (CON)

The CON (also known as the LAPD Concentrator) is used by the optional feature LAPD Concentration for RBS 2000. Therefore, the CON, as an MO, is itself optional. There is one CON defined per TG. • Transceiver Controller (TRX)

The TRXC controls all the functions for signal processing, radio reception, and radio transmission. In a normal configuration, each TRXC (also known as TRX) corresponds to one TRU. There can be up to 16 TRXCs defined per TG.

RBS • Transmitter (TX) and Receiver (RX)

The MO representing the transmitter functions – for example, transmitted power and frequency on the bursts sent – is called the TX. The RX represents the radio receiving functions. There can be up to 16 TXs and RXs defined per TRXC. • Interface Switch (IS)

The IS provides a system interface to the PCM links and crossconnects individual timeslots to specific transceivers. There is one IS defined per TG • Timing Function (TF)

The TF extracts synchronization information from the PCM links and generates a timing reference for the RBS. There is one TF defined per TG. • Time Slots (TS).

TS is the MO that represents the handling of timeslots. There can be up to eight TSs defined per TRXC. • Multi Carrier Transmitter Receiver (MCTR). MCTR represents the TRX functionality in the MCPA (RUS) HW.

CELL CELL DEFINITION DESCRIPTION DATA DEFINITION OF SUBCELLS CHANNEL GROUPS FREQUENCY HOPPING DATA CONFIGURATION FREQUENCY DATA CONFIGURATION CONTROL CHANNEL DATA MEASUREMENT FREQUENCIES NEIGHBOR RELATIONS …

CONNECTION OF CELL TO TRANSCEIVER GROUP CELL STATE 

WinFIOL

OSS/CNA

OSS/CNA

OSS/BSM