Activating and Testing BSC4040_Satellite.pdf

GSM/EDGE BSS, Rel. RG20(BSS), Operating Documentation, Issue 07

Activate

Activating and Testing BSC4040: Satellite Abis

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Issue 6-4Approval Date 2009-12-10

Confidential

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Id:0900d805808049d9Confidential

The information in this document is subject to change without notice and describes only the product defined in the introduction of this documentation. This documentation is intended for the use of Nokia Siemens Networks customers only for the purposes of the agreement under which the document is submitted, and no part of it may be used, reproduced, modified or transmitted in any form or means without the prior written permission of Nokia Siemens Networks. The documentation has been prepared to be used by professional and properly trained personnel, and the customer assumes full responsibility when using it. Nokia Siemens Networks welcomes customer comments as part of the process of continuous development and improvement of the documentation.

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Table of contentsThis document has 25 pages.

Summary of changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1 Satellite Abis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.1 Configuration requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.2 File descriptions in Satellite Abis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.3 Effects of Satellite Abis on interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.4 Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2 Activating and testing Satellite Abis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.1 Activating Satellite Abis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.2 Testing Satellite Abis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3 Deactivating and testing Satellite Abis. . . . . . . . . . . . . . . . . . . . . . . . . . 23

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List of figuresFigure 1 Satellite link in the Abis interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 2 Signal Timing selection from Traffic Manager. . . . . . . . . . . . . . . . . . . . . 17Figure 3 Commissioning Pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 4 Abis Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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Activating and Testing BSC4040: Satellite Abis Summary of changes

Id:0900d80580804978Confidential

Summary of changesChanges between document issues are cumulative. Therefore, the latest document issue contains all changes made to previous issues.

Changes made between issues 6-5 and 6-4In chapter 2 Activating and testing Satellite Abis, sub-chapter Configure the TCSM has been updated with information on transcoding function performed by the Multimedia Gateway (MGW).

Changes made between issues 6-4 and 6-3In chapter 2 Activating and testing Satellite Abis, sub-chapter 2.1, step 10 is modified with the timer T3192 setting to 2.

In chapter 2 Activating and testing Satellite Abis, sub-chapter 2.1, step 10 patching instruction for the timer T3141 is modified by changing the record number to 11D.

In chapter 3 Deactivating and testing Satellite Abis, step 5 instruction for patching back to default value for the timer T3141 is modified by changing the record number to 11D.

Changes made between issues 6-3 and 6-2In chapter Satellite Abis, sub-chapter Traditional satellite services has been added.

In Satellite Abis summary, list 4 is modified.

In Reference, 3 new MML commands are added.

In File descriptions in Satellite Abis, Nokia Flexi EDGE BTS is modified.

The sub-chapter Effects of Satellite Abis on interfaces, the description is modified.

The sub-chapter Recommendations is modified.

The chapter Activating Satellite Abis is modified.

Steps 1 and 2 are removed and new steps have been added.Steps 3 and 4 are modified. A note is added at the end of the step 6. Step 10 is modified.

In chapter Testing Satellite Abis, list 1 of Before you start is removed. The description is modified.

In chapter Deactivating and testing Satellite Abis, steps 1 and 4 are removed.New steps 1 and 2 are added. Step 5 is modified.

Changes made between issues 6-2 and 6-1Information on Flexi EDGE, has been added to Satellite Abis, section File descriptions in Satellite Abis and Activating and testing Satellite Abis, section Activating Satellite Abis.

Changed the T3141 in chapter Activating and testing Satellite Abis and Deactivating and testing Satellite Abis.

Changes made between issues 6-1 and 6-0Information on parameter adjustments related to PCU2 has been added to Satellite Abis, section Effects of Satellite Abis on interfaces.

Information on BCSU switchover (applicable for PCU2 HW) has been added to step Modify (E)GPRS related parameters in Activating Satellite Abis.

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Satellite Abis

1 Satellite AbisSatellite Abis enables you to create coverage of the network in areas where the coverage could not otherwise be implemented because of the limitation of transmission media. Satellite circuits are useful when connecting extremely remote locations, but also when no other transmission means exist. Satellite Abis is an application software intended for connecting the BSC to remote BTSs. Typically, these remote BTSs are used in special low-capacity and temporary applications. Only a minimum number of equipment is required at the remote cells.

The general arrangement of the Satellite Abis connection is presented in the figure Sat-ellite link in the Abis interface.

Figure 1 Satellite link in the Abis interface

Traditional Satellite ServicesTo support satellite BSC-BTS circuits, Satellite Abis enables a connection of BTSs to a BSC over a transmission path. The main drawback of a (geostationary) satellite circuit is the relatively long one-way end-to-end delay of approximately 260 - 280 ms. As for bit error (BER) performance, the satellite circuits behave as radio links with a possibility of deep fades even down to the total loss of the signal. Long delay together with bit errors decreases signalling message throughput. BSC and BTS parameters and timers are adapted for the long delay.

Tests using satellite circuits have shown the following:

The delay slows down all signalling traffic which needs frequent handshakes. GSM system timers are not designed for long delays, and they must be set correctly.

The transcoding and rate adaptation unit (TRAU) frame time alignment function does not tolerate long delays. The time alignment function forms a control loop between the transcoder and the BTS, and with excessive delay this control loop becomes unstable

SGSN

BTS MSC

BTS

TC HLR

Satellite

Abis

interface

Ater

interface

A

interface

MSC-HLR

interface

BSC

Gb

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Activating and Testing BSC4040: Satellite Abis Satellite Abis


Satellite services with extended delays The usage of IP and new technologies like "dynamic bandwidth allocation" has changed the nature of satellite services. This enables more efficient satellite bandwidth hi utiliza-tion with the price of extended delays and increased jitter. As high as 380 ms delays have been quoted.

The issue has the following implications:

Satellite connection cost may decrease higher delay/jitter degrades GSM/EDGE performance special BSS settings are neededNSN does not promote degraded performance but in order to provide flexibility, NSN provides special setups for such situation when cost savings are prioritized over GSM/EDGE quality.In BSC a special "Enhanced satellite Abis" setup should be used and dedicated PCU2s should be selected for satellite application.

The Satellite Abis summary

Satellite Abis is an application software Satellite Abis can be utilised either on Abis or Ater interface Satellite Abis is introduced per BTS Satellite Abis is activated creating Abis D-channels (telecommunication and OMU

signalling channels) using satellite Abis parameter sets, setting PCU as satellite Abis PCU and by a parameter switch in the BTS. Parameter switch in the BSC can be used for traditional satellite services.

Standard mobile phones are used Standard MSC is used Standard SGSN is used There are no alarms involved in Satellite AbisRelated topics in Satellite Abis

Test and Activate Transmission

Activating and testing Satellite Abis Deactivating and testing Satellite Abis

Other related topics in BSC/TCSM documentation

References Commands

MML Commands DF - Memory File Handling EG - GSM Timer and BSC Parameter Handling EQ - Base Transceiver Station Handling in BSC ER - Transceiver Handling EV - BCF Hardware Database Handling EW - BCF Software Handling WO - Parameter Handling ES -Abis Interface Configuration DS -Primary Rate Access D-Channel Data Handling EF -Base Control Function Handling

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Satellite Abis

Parameters BSS Radio Network Parameter Dictionary

1.1 Configuration requirements Satellite Abis in ETSI and ANSI networksNetworks based on European ETSI standards are mainly discussed here. Satellite Abis is also available in networks based on American ANSI standards. Where differences arise because of ANSI standards, these are mentioned.

The satellite equipment must be compatible with GSM equipment and fulfil the following prerequisites in the Abis satellite link:

Networks based on ETSI standards

Interfaces operate at the bit rate of 2 Mbit/s. Typically only some time slots of the 2 Mbit/s trunk carry traffic. The BTS-BSC connection is transparent for these time slots, and satellite transmission capacity is reserved only for these time slots. The minimum transmission capacity requirement is two 64 kbit/s time slots per one TRX. The normal requirement is two and a half time slots per one TRX. EGPRS Dynamic Abis Pool provides additional transmission capacity which is required by higher packet data bit rates.

Interface must comply with ITU-T Recommendation G.703. Framing must comply with ITU-T Recommendation G.704. HDB3 line coding must be used. Line impedance must be 75 or 120 ohms. The use of CRC-4 error detection is recommended. The bit error ratio (BER) must always be better than 3x10E-5 over the BTS-BSC

path and typically better than 3E-6.

Networks based on ANSI standards

Interfaces operate at the bit rate of 1.5 Mbit/s. Typically only some time slots of this trunk carry traffic. The BTS-BSC connection is transparent for these time slots, and satellite transmission capacity is reserved only for these time slots. The minimum transmission capacity requirement is two 64 kbit/s time slots per one TRX. The normal requirement is two and a half time slots per one TRX. EGPRS Dynamic Abis Pool provides additional transmission capacity which is required by higher packet data bit rates.

Interface and framing must comply with ANSI Recommendation T1.403. B8ZS line coding must be used. Line impedance must be 100 ohms. The use of CRC-6 error detection is recommended. The bit error ratio (BER) must always better than 3x10E-5 over the BTS-BSC path

and typically better than 10E-6.

1.2 File descriptions in Satellite AbisThe decision between the normal or the satellite build is made when the BTS build is set at the BSC. The BTS SW Release contains the file list.

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Talk-family BTS (DE34/DF34)From the version DF2.1 onward a special Satellite Abis software build is needed. For example, GSM/DCS BTS SW DF3.0 contains two master files; the first (BTS_S301.180) is intended for regular Abis, and the second (BTS_S301.19B) is intended for Satellite Abis.

FUC configuration files are also different for regular Abis and Satellite Abis; for example, CFG_S301.18F is intended for regular Abis, and CFG_S301.199 is intended for Satellite Abis.

Flexi EDGE, Ultrasite or MetroSite EDGE BTSThere is no separate master file in BTS SW build of Flexi EDGE, Ultrasite and Metrosite EDGE BTSs for satellite Abis.

Flexi EDGE BTSSatellite Abis is not compatible with Flexi EDGE BTS SW EP1.0. However, it can be used with the software version EP2.0. Satellite Abis with extended delay can be used with the software version EP3.0 MP2.

1.3 Effects of Satellite Abis on interfacesOnly the Abis interface is affected by Satellite Abis. The changes are caused by the increased delay which can disturb procedures relying on handshakings or timers.

For call handling, the most important change concerns the link access procedure on the D-channel (LAPD) layer L2 timer T200 (see ETSI Recommendation ETS 300 595). This timer is increased from 240 ms to 1000 ms.

Also the LAPD parameter K, Maximum number of outstanding frames, is modified from K=2 to K=7. This applies only to LAPD frames the SAPI value of which is 0. Extended satellite Abis delay case K value is modified to 14..

For BSC, LAPD parameters T200 and K are set accordingly selecting D-channel param-eter set.

Timers supervising BTS software downloading are increased to handle the increased delay.

For GPRS and EGPRS the following parameter adjustments are recommended in PCU1 case:

Parameter PCU abis connection type parameter to value S satellite. Packet territory of BCFs with satellite Abis connections are only allowed to attach to PCU with sat-ellite connection type parameter with value satellite.

Parameter BS_CV_MAX to value 15. Mobile entering to countdown procedure is based on BS_CV_MAX. The parameter determines how many radio block periods the countdown procedure lasts in the end of an uplink (UL) temporary block flow (TBF). The optimal value depends on BSS radio link control (RLC) round trip time, which is large when Satellite Abis is used.

Timer T3192 value to 1.5 s. The MS uses this timer to determine how long to monitor packet associated control channel (PACCH) after the end of a TBF.

Timer T3141 to value 2000 ms. The BSS uses this timer to determine how long to wait for an MS response to TBF establishment on common control channel (CCCH).

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Satellite Abis

Parameter CMAX to value 1%. The BSS uses this parameter to determine the maximum GPRS/EGPRS territory size. Using more than one GPRS/EGPRS timeslot increases the abnormal TBF release probability.

For GPRS and EGPRS the following parameter adjustments are recommended in PCU2 case:

Parameter PCU Abis connection type parameter to value S satellite. Packet territory of BCFs with satellite Abis connections are only allowed to attach to PCU with sat-ellite connection type parameter with value satellite. When PCU2 is set for satellite Abis connections with parameter PCU Abis connection type, PCU2 uses automati-cally satellite specific parameters (it is not needed to modify parameters BS_CV_MAX, T3192 and T3141).

Parameter CMAX to value that allows maximum two RTSL packet territory size. The BSS uses this parameter to determine the maximum GPRS/EGPRS territory size.

1.4 RecommendationsBecause of the cumulative speech delay, it is recommended that only one satellite hop be used at the same time in a GSM/DCS network. However, it is possible to use MSC-MSC (or MSC-HLR) satellite circuits simultaneously, but this situation has to be taken into special consideration. A public switched telephone network (PSTN) may use satel-lite circuits as well and this should be avoided if possible.

The GSM system delay added to satellite path delay results in a delay (of echo) of approximately 180 ms + 520 ms = 700 ms or in extended dealy case180 ms + 760 ms = 940 ms. This exceeds the values given in the ETSI Recommendation ETS 300 903 and the ITU-T Recommendation G.114. If you (the telephone user) are aware of the delay, and (preferably) use echo control, the delay typically causes no harm. A remote MS to remote MS call suffers a double delay (from 1400 ms to 1880 ms) because of the double satellite hop.

It is not recommended to use acoustic echo cancellation (AEC) feature in a BSS having extended satellite Abis delay BCF and mixed configurations with terrestrial and satellite BCFs in BSS. In Nokia Siemens Network MGW or S14 TCSM3i equipment, AEC feature could be used for lower delay connections without affecting longer delay connections.

It is not recommended to allow handovers between satellite cells and terrestrial cells because of possible frequency differences between these systems. Timing depends on varying doppler shifts of the satellite system used. A typical doppler uncertainty is less than 2x10E-7. Using a BTS with an internal clock (MCLU clock unit) avoids this timing problem, but regular clock unit maintenance may be difficult.

As the BSC-BTS/TRX signalling capacity is reduced, any unnecessary signalling should be avoided. However, some signalling cannot be avoided because the network elements depend on a common MSC.

You can reduce the signalling load in the following ways:

Periodic location updating: Disable the periodic location updating procedure or define it for a 24-hour interval.

Unnecessary paging: Define for satellite cells a location area of their own. Disable intra-BTS handovers (EIC = N, EIH = N).

MML commands involved: EHG, EHO. EHC. Disable queuing (MQL = 0%).

MML commands involved: EQH, EQO.

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The call processing capacity of busy hour call attempts (BHCA) is 70% of normal GSM capacity in a satellite Abis link. This can be balanced by using more TRXs, and more stand-alone dedicated control channel (SDCCH) capacity, than are normally needed.

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Activating and testing Satellite Abis

2 Activating and testing Satellite AbisThe procedure is basically the same as for normal terrestrial BSC - BTS circuits. These instructions only show actions which are needed for satellite circuits.

Satellite Abis is an application software product. It is not included in the standard BSC software.

Note also that it is recommended to use the default values in GSM (BSC and MSC) system timers. Lower values than the default ones may be inadequate for handling the delay of the satellite connection.

2.1 Activating Satellite AbisYou can control the use of the optional Satellite Abis functionality BCF by BCF with D-channel settings (D-channel parameter sets).

The PRFILE parameter SATELL_ABIS_IN_USE can be used to toggle the Satellite Abis on or off as needed. If BCF use D-channel parameter set 0, it is defined as satellite Abis if SATELL_ABIS_IN_USE is TRUE (setting ZWOC:10,31,FF; and checking ZWOI:10;).

This is used for old satellite configurations after upgrade and is used for old satellite Abis configurations after update from older BSC software release. You can define terrestial Abis connection with parameter set value 8 in this case. Preferred way to set satellite configuration for new satellite Abis connection is to set right D-channel parameter set on D-channel creation.

You can control the use of the optional Satellite Abis functionality PCU by PCU config-uring PCU Abis connection type. All PCUs in one pool have same PCU Abis connection type.

BSC increases T3101 timer value automatically for satellite Abis connections according to the selected D-channel parameter set. Timer value is increased by 2 x one way delay in the link i.e. either 2*280 = 560ms or 2*420 = 840 ms. T3101 supervises SDCCH establishment procedure on CCCH.

Steps

1 Modify PCU Abis connection Type.Modify PCU Abis connection type to support satellite Abis:

ESN:BCSU=,PCU=:AIT=S;Or Modify PCU pool Abis connection type to support satellite Abis:

ESN:PSEI=:AIT=S;Note that the PCU pooling case whole PCU pool shall be modified for satellite Abis

Check PCU Abis connection type:

ESP:BCSU=,PCU=;Or check PCU pool Abis connection type:

ESP:PSEI=;

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Activating and Testing BSC4040: Satellite Abis Activating and testing Satellite Abis


Note that for EGPRS, create DAP and attach DAP related to satellite Abis BCF to sat-ellite Abis PCU or PCU pool

2 Create OMU and telecommunication signalling channels for BCF and TRXsCreate D-channel and set parameter set according Abis connection:

ZDSE::, :,,, , ;[D-Channel type | N def],;D-channel parameter sets:

0 terrestrial (if the PRFILE parameter SATELL_ABIS_IN_USE is TRUE, parameter set 0 is overwritten with parameter set 1)

1 satellite Abis (delay supported up to 280 ms) 2 terrestrial BTSplus 3 satellite BTSplus 7 enhanced satellite Abis (enhanced delay supported up to 420 ms) 8 terrestrial AbisNote that to Use same D-channel parameter set for all Abis signalling channels of one BCF and TRX of the BCF

Note that for BCFs using D-channel parameter set 0, satellite Abis can be activated setting SATELL_ABIS_IN_USE is TRUE (setting ZWOC:10,31,FF; and checking ZWOI:10;). This is used for old satellite Abis configurations after update from older BSC software release. Preferred way to set satellite configuration for new satellite Abis con-nection is to set right D-channel parameter set on D-channel creation

Check signalling channel parameter set:

ZDSB: NAME=;

3 Activate Acoustic Echo Cancellation (WOA).ZWOA:2,371,A;Note that the Acoustic Echo Cancellation is not recommended, if there is configured BCF with enhanced satellite delay. Acoustic Echo Cancellation is not recommended, if there is configured BCF with terrestrial Abis connection and BCF with satellite Abis con-nection to one BSC.

4 Check that the activation succeeded (WOS).ZWOS:2,371;Note that the Acoustic Echo Cancellation is not recommended, if there is configured BCF with enhanced satellite delay. Acoustic Echo Cancellation is not recommended, if there is configured BCF with terrestrial Abis connection and BCF with satellite Abis con-nection to one BSC.

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5 Configure sufficient SDCCH capacity.a) In TRX1, two time slots are defined for signalling: a combined BCCH and SDCCH/8

(six others are defined as TCHs). Use the following commands to configure SDCCH capacity.Lock the BTS (EQS).ZEQS:BTS=:L; Lock TRX1 (ERS).ZERS:BTS=,TRX=:L;Modify the time slots (ERM).ZERM:BTS=,TRX=:CH0=MBCCHC; ZERM:BTS=,TRX=:CH1=SDCCH;

b) In other TRXs, one time slot is defined for signalling (SDCCH/8, preferably timeslot zero) and seven others are defined as TCHs. Use the following commands.Configure SDCCH capacity (ERS, ERM).ZERS:BTS=,TRX=:L;ZERM:BTS=,TRX=:CH0=SDCCH;Unlock all locked TRXs (ERS).ZERS:BTS=,TRX=:U;Unlock the BTS (EQS).ZEQS:BTS=:U;

Other parameters which minimise the SDCCH reservations:

number of slots spread trans (SLO) = 32 max number of retransmission (RET) = 2 max number of repetition (NY1) = 5To set these parameters, use the command

ZEQM:BTS=:SLO=32,RET=2,NY1=5; Here identifies the remote BTS.

6 Configure the TCSM.You can configure the TCSM either locally or remotely. Remote access is recom-mended. The following instructions give the commands for remote access.

There are no firmware requirements.

Steps

a Create the remote session (DDT).ZDDT:TCSM,;

Username EXPERTPassword SYSTEM

Here is the address of the transcoder.

b Disable TRAU frame alignment in the TCSM (ZRS). ZRS:ALL:OFF

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Do you want configuration changes to bepermanent by saving them in flash memory?Please answer (Y/N) Y

The TCSM is activated by enabling the parameter on/off per BSC. In the TCSM the time alignment can be turned off from the command menu. Because of the fixed MS timers, there may be re-attempts in the signalling, causing limitations to the capacity of these cells.

c Enable acoustic echo cancellation (AEC) (RU).ZRU:ALL: =ON;

Please, confirm (Y/N) YDo you want configuration changes to bepermanent by saving them in flash memory?Please answer (Y/N) Y

Here can be either FR, EFR, HR or AMR.

Note that the command depends on the type of speech coding used.

Note that the Acoustic Echo Cancellation is not recommended, if there is configured BCF with enhanced satellite delay. Acoustic Echo Cancellation is not recom-mended, if there is configured BCF with terrestrial Abis connection and BCF with satellite Abis connection to one BSC.

d Set the AEC tail delay correctly (RU).ZRU:ALL:DELAY=;Please, confirm (Y/N) YDo you want configuration changes to be permanentby saving them in flash memory? Please answer (Y/N) YNormally either 520 ms, 540 ms or 560 ms are suitable values for . You can check this with a listening test.

Note that the Acoustic Echo Cancellation is not recommended, if there is configured BCF with enhanced satellite delay. Acoustic Echo Cancellation is not recom-mended, if there is configured BCF with terrestrial Abis connection and BCF with satellite Abis connection to one BSC.

e Check that all selections are correct (RC).ZRC::10; is the actual PCM used

f Terminate the remote session.ZX

g Further informationIn case the transcoding function is performed by the Multimedia Gateway (MGW), for A-ter configurations refer subhcpater Configuring an Ater interface with the MGW in chapter Configuring a new transcoder in the document Managing the BSS Transmis-sion.

In BSC-MGW case some modifications to the MGW is required and for more details on the configuration, refer the document MGW Configuration Data management.

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7 Activate Satellite Abis in a Talk-family BTS (DE34/DF34).Before you startThere are no firmware requirements.

Before activating Satellite Abis in DE34/DF34, remote BTSs must be configured for sat-ellite use by editing the HW database.

Steps

a In the HW database, select the BCF/Units window.b Select the Abis type as Satellite.

Further informationThis shows the default satellite Abis value for LAPD T200 timer = 1000 ms. Nor-mally, Abis type is normal and T200 = 240 ms.

c Load the Satellite Abis BTS software build in the BTS.d Add a new HW database (EVU, EVC, EVA, EVV).

If there is an active BCF HW database in the BSC, a new satellite-specific HW database must be uploaded, created, attached and activated as follows

ZEVU::NAME=,EXT=;ZEVC::NAME=,EXT=;ZEVA::;ZEVV::PAS;

8 Activate Satellite Abis in UltraSite or MetroSite EDGE BTS.Before you startBefore activating Satellite Abis in an UltraSite or MetroSite BTS, remote BTSs must be configured for satellite use by editing the Traffic Manager. The Traffic Manager editor is in Ultrahub Manager (Ultrasite) and in BTS Manager (Metrosite) and the procedure is the same for both.

Steps

a Open the Commissioning Wizard.Select various relevant parameters for commissioning to reach to Transmission Parameters.

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b In Traffic Manager window, select the Signal Timing as 'Satellite'.

Figure 2 Signal Timing selection from Traffic Manager

c Click OK to send the information to the BTS.

9 Activate Satellite Abis in Flexi EDGE.Before you startBefore activating Satellite Abis in Flexi EDGE, BTSs must be commissioned with the Satellite Abis using Flexi EDGE BTS Manager from Abis Termination Window of Com-missioning Wizard. Following are the complete procedures for activation of Satellite Abis in Flexi EDGE BTS.

Steps

a From the Flexi EDGE BTS Manager open the Commissioning Wizard.Select various relevant parameters for commissioning to reach to Transmission Parameters.

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b In the Transmission Parameters in the left pane of commissioning, select Abis Termination as shown in the figure Commissioning Pane.

Figure 3 Commissioning Pane

c On the Abis Termination window select Satellite Abis check box to activate the feature for Flexi EDGE BTS as shown in the figure: Abis Termina-tion.

Figure 4 Abis Termination

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d Click Next to proceed with the commissioning of the BTS.e Click Send SCF to commission / recommission the BTS to use the Satellite

Abis Feature.Note that the Satellite feature can be activated only during commissiong / append commissioning / Recommissioning of the Flexi EDGE BTS through the procedure as demonstrated here above

Note that the Other BSC related parameters for the Satellite Abis to be used on Flexi EDGE BTS are the same as those of UltraSite and as mentioned in Activating and Testing BSC4040 : Satellite Abis.

10 Modify GPRS/EDGE-related parameters.There are no separate steps for EDGE.

If first generation PCU is configured for satellite Abis connection type, parameters BS_CV_MAX, T3192 and T3141 should be configured following way:

If PCUs with satellite connection type are second generation PCUs (PCU2), following parameters should not be modified (PCU2 uses satellite specific parameter in satellite Abis case).

BS CV MAX parameter (not applicable for PCU2 HW)Set BS_CV_MAX to value 15:ZEGP:14:15;After 5 minutes, disable and then re-enable GPRS in the cells where GPRS is active for the change to take effect.Check the modified parameter:ZEGO:PAR:;

Timer T3192 (not applicable for PCU2 HW)Set timer T3192 to value 1.5 s:ZEGT:T3192:1,2:;After 5 minutes, disable and then re-enable GPRS in the cells where GPRS is active for the change to take effect.Check the modified parameter:ZEGO:TIM:;

Patching Timer T3141(not applicable for PCU2 HW)Check the default value of timer T3141:ZDFD:OMU:FF,11D,,W:;

LOADING PROGRAM VERSION 5.11-0

BSC3i BSC12 2007-01-23 08:16:41

OMU FILE N:O 00FF0000 RECORD N:O 0000011D 002E 0006 0320 0005 0005 000F 0004 0008 07D0 07D0 07D0 0BB8 0004 00C8 0000 0002

COMMAND EXECUTEDPatch T3141 timer value to 1500 ms:ZDFS:OMU:FF,11D,2,W:;

DO YOU WANT THESE SUBSTITUTIONS TO BE UPDATED ON DISK ?( Y = YES, N = NO ): Y

20 DN9812652




DO YOU WANT THESE SUBSTITUTIONS TO BE DISTRIBUTED ?( Y = YES, N = NO ): Y

BSC3i BSC12 2007-01-23 08:17:13

OMU FILE N:O 00FF0000 RECORD N:O 0000011D SUBRECORD N:O 00000002

0320-5DC;

DO YOU WANT THIS SUBSTITUTION TO BE MADE ?( Y = YES, N = NO ): Y

RECORD/STRING SUBSTITUTED

DISTRIBUTION IS STARTING

DISTRIBUTION DONE

DISK HAS BEEN UPDATED

COMMAND EXECUTEDCheck the patched value of timer T3141:ZDFD:OMU:FF,11D,,W:;

LOADING PROGRAM VERSION 5.11-0

BSC3i BSC12 2007-01-23 08:17:32

OMU FILE N:O 00FF0000 RECORD N:O 0000011D 002E 0006 05DC 0005 0005 000F 0004 0008 07D0 07D0 07D0 0BB8 0004 00C8 0000 0002

COMMAND EXECUTED CMAX parameter (not applicable for PCU2 HW)

Set CMAX to value 1%.To modify the CMAX parameter, GPRS must be disabled in the cell first:ZEQV:BTS=:GENA=N;Set CMAX to value 1% and enable GPRS:ZEQV:BTS=:CMAX=1,GENA=Y;

DN9812652 21



Applicable for PCU2 HW only:Set CMAX to value that allows two radio timeslots for (E) GPRS.To modify the CMAX parameter, GPRS must be disabled in the cell first:ZEQV:BTS=:GENA=N;Set CMAX for 2 radiotimeslots and enable GPRS:ZEQV:BTS=:CMAX=,GENA=Y;

Further informationNext, test Satellite Abis.

2.2 Testing Satellite AbisThe tests cases include test calls, SW downloading and (implicit) BCF reset.

Before you startTest environment requirements:

An operational MSC An operational packet core network Mobile stations (GPRS and EGPRS capable mobile stations) Transmission circuits to and from the operational satellite terminalsIf no real satellite circuits are available for pretesting or troubleshooting, the satellite may be simulated by suitable test equipment (adding a one-way delay of 280 ms or 420 ms and possibly also bit errors).

Steps

1 Create the correct BTS SW version.ZEWC::MF=,EXT=,SDIR=;

2 Attach the BTS SW version.ZEWA:::;Expected outcomeThe BTS software is downloaded to the remote BTS after the software build attachment.

Note that if BTS SW is downloaded via satellite Abis, the download time is 4 to 5 times longer than normal SW download because of the slowness of satellite Abis.

3 Activate the BTS SW version.ZEWV::;

4 Make test calls.Make mobile-originated (MO) and mobile-terminated (MT) test calls to test the system

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Expected outcomeSatellite delay increases call set-up time by approximately 7 seconds. You can hear the increased speech delay.

Some UL echo may occur depending on the acoustic performance of the mobile station. If you use AEC, no echoes should be audible (if you hear echoes, however, changing the delay value may help).

5 Make data calls.Expected outcomeSatellite delay increases the system round trip times.

Throughput is lower compared to a terrestrial Abis configuration.

DN9812652 23

Activating and Testing BSC4040: Satellite Abis Deactivating and testing Satellite Abis

Id:0900d805806a4f4dConfidential

3 Deactivating and testing Satellite AbisSteps

1 Remove satellite Abis BCFs and D-channels.When satellite Abis BCF is created using D-channel set 1, 3 or 7, satellite Abis connec-tion is possible to remove only by removing satellite TRXs, BTSs, BCFs and D-channels with satellite Abis parameter set.

If satellite Abis is activated for BCF with D-channels created to use D-channel parameter set 0 with setting SATELL_ABIS_IN_USE is TRUE, satellite Abis can be deactivated from those BCF by setting SATELL_ABIS_IN_USE as FALSE (setting ZWOC:10,31,FF; and checking ZWOI:10;).For BCFs using D-channel parameter set 0, satellite Abis can be activated setting SATELL_ABIS_IN_USE is TRUE (setting ZWOC:10,31,0; and checking ZWOI:10;).This is used for old satellite Abis configurations after update from older BSC software release. Preferred way to set satellite configuration for new satellite Abis connection is to set right D-channel parameter set on D-channel creation.

2 Modify PCU Abis connection type.Modify PCU Abis connection type to support satellite Abis:

ESN:BCSU=,PCU=:AIT=T;Or Modify PCU pool Abis connection type to support satellite Abis:

ESN:PSEI=:AIT=T;Note that the PCU Abis connection type is modifiable, when there are no any BTSs attached into PCU or, in PCU pooling case, no any BTSs attached into PCU pool.

Note that the PCU pooling case whole PCU pool shall be modified for satellite Abis.

Check PCU Abis connection type:

ESP:BCSU=,PCU=;Or check PCU pool Abis connection type:

ESP:PSEI=;For EGPRS, create DAP and attach DAP related to satellite Abis BCF to satellite Abis PCU or PCU pool.

3 Set the AEC delay value in the TCSM.ZRU: ALL:DELAY=0

Please, confirm (Y/N) YDo you want configuration changes to bepermanent by saving them in flash memory?Please answer (Y/N) Y

Typically no other parameters need to be changed.

The Satellite Abis build in the BTS operates normally with the normal terrestrial Abis interface in the BSC.

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Deactivating and testing Satellite Abis

4 Switch on the transcoder TRU.ZRS:ALL=ON;

5 Check that the state of LAPD timers is normal.If first generation PCU was configured for satellite Abis connection type, parameters BS_CV_MAX, T3192 and T3141 should be configured following way:

Note if PCUs with satellite connection type are second generation PCUs (PCU2), follow-ing parameters should not be modified (PCU2 uses satellite specific parameter in satel-lite Abis case)

BS CV MAX parameter

Set BS_CV_MAX back to its original value. The default value is 9, but it is recommended to use the original value:

ZEGP:14:9;After 5 minutes, disable and then re-enable GPRS in the cells where GPRS is active for the change to take effect.

Check the modified parameter:

ZEGO:PAR:;Timer T3192

Set timer T3192 back to its original value. The default value is 0, but it is recommended to use the original value.

ZEGT:T3192:1,0:;After 5 minutes, disable and then re-enable GPRS in the cells where GPRS is active for the change to take effect.

Check the modified parameter:

ZEGO:TIM:;Patching Timer T3141

Check the default value of timer T3141:

ZDFD:OMU:FF,11D,,W:;LOADING PROGRAM VERSION 5.11-0

BSC3i BSC12 2007-01-23 08:16:41

OMU FILE N:O 00FF0000 RECORD N:O 0000011D 002E 0006 05DC 0005 0005 000F 0004 0008 07D0 07D0 07D0 0BB8 0004 00C8 0000 0002

COMMAND EXECUTEDPatch T3141 timer back to its original value:

ZDFS:OMU:FF,11D,2,W:;DO YOU WANT THESE SUBSTITUTIONS TO BE UPDATED ON DISK ?( Y = YES, N = NO ): Y

DN9812652 25

Activating and Testing BSC4040: Satellite Abis Deactivating and testing Satellite Abis


DO YOU WANT THESE SUBSTITUTIONS TO BE DISTRIBUTED ?( Y = YES, N = NO ): Y

BSC3i BSC12 2007-01-23 08:17:13

OMU FILE N:O 00FF0000 RECORD N:O 00000011D SUBRECORD N:O 00000002

05DC-320;

DO YOU WANT THIS SUBSTITUTION TO BE MADE ?( Y = YES, N = NO ): Y

RECORD/STRING SUBSTITUTED

DISTRIBUTION IS STARTING

DISTRIBUTION DONE

DISK HAS BEEN UPDATED

COMMAND EXECUTEDCheck the patched value of timer T3141:

ZDFD:OMU:FF,11D,,W:;LOADING PROGRAM VERSION 5.11-0

BSC3i BSC12 2007-01-23 08:17:32

OMU FILE N:O 00FF0000 RECORD N:O 0000011D 002E 0006 0320 0005 000F 0004 0008 07D0 07D0 07D0 0BB8 0004 00C8 0000 0002

COMMAND EXECUTED

Activating and Testing BSC4040: Satellite AbisTable of contentsList of figuresSummary of changes1Satellite Abis1.1Configuration requirements 1.2File descriptions in Satellite Abis1.3Effects of Satellite Abis on interfaces1.4Recommendations

2Activating and testing Satellite Abis2.1Activating Satellite Abis2.2Testing Satellite Abis

3Deactivating and testing Satellite Abis3Steps

Activating and Testing BSC4040_Satellite.pdf

Documents

Transcript of Activating and Testing BSC4040_Satellite.pdf