csdap

GSM/EDGE BSS, Rel. RG20(BSS), Operating Documentation, Issue 05

BSS30385: Circuit Switched Dynamic Abis Pool

DN0963087

Issue 01BApproval Date 2011-04-08

Confidential

2 DN0963087Issue 01B


Id:0900d8058084fd4dConfidential

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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Copyright © Nokia Siemens Networks 2011. All rights reserved

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Installation, Betrieb, Wartung und sonstige Handhabung des Produktes darf nur durch geschultes und qualifiziertes Personal unter Beachtung der anwendbaren Sicherheits-anforderungen erfolgen.

Die Sicherheitsanforderungen finden Sie unter „Sicherheitshinweise“ im Teil „Legal, Safety and Environmental Information“ dieses Dokuments oder dieses Dokumentations-satzes.

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Table of contentsThis document has 22 pages.

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

2 Introduction to the feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Benefits for the operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.1 Software requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.2 Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1 Functional details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.1 CSDAP radio network object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.2 Supervising CSDAP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.2 Functional split . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 System impacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.1 Relations to other features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.2 Impacts on SoC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.3 Impacts on interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2 MML commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147.3 System responses to failures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147.4 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177.5 Measurements and counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8 Activating and Deactivating the feature . . . . . . . . . . . . . . . . . . . . . . . . . 198.1 Activating the Circuit switched dynamic Abis pool feature. . . . . . . . . . . 208.2 Deactivating the Circuit switched dynamic Abis pool feature. . . . . . . . . 21

9 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 – Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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List of tablesTable 1 Software requirements for different network elements . . . . . . . . . . . . . . 8Table 2 Parameters for Circuit switched dynamic Abis pool . . . . . . . . . . . . . . . . 13Table 3 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Table 4 Alarms for the feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Table 5 Counters for CSDAP call control measurement . . . . . . . . . . . . . . . . . . 17Table 6 CSDAP counters for traffic measurement . . . . . . . . . . . . . . . . . . . . . . . 18

DN0963087 5

BSS30385: Circuit Switched Dynamic Abis Pool Summary of changes

Id:0900d8058085e975Confidential

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

Changes between issues 01Band 01AInformation on software and hardware requirement is updated in chapter Requirements.

Information on CSDAP radio network object is updated in section 5.1.1 of Functional description.

Information on BSS21534: OSC Full Rate with SAIC MS and BSS21325: 8k TRAU for OSC AMR FR is updated in chapter System impacts.

Information on parameters and counters are updated in chapter User interface.

Changes between issues 01A and 01The chapter Activating and Deactivating the feature is updated to include updated MML Commands.

MML Commands updated to add UBP command.

Issue 01This is the first issue.

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Introduction to the feature

2 Introduction to the featureBSS30385 "Circuit switched dynamic Abis pool” (CSDAP) is a feature that offers a common Abis transmission pool that can be shared by all speech calls in a base station control function (BCF) cabinet. A common Abis transmission pool is useful with feature that needs more Abis transmission capacity than the legacy fixed Abis interface offers. An example of such a feature is Orthogonal Subchannel (OSC) Half Rate with SAIC MS.

In legacy Abis interface there are allocated 16 kbit/s fixed transmission capacity from Abis ETPCM for each radio timeslot. With the OSC Half Rate with SAIC MS feature more Abis transmission is needed for a radio timeslot where two calls are multiplexed into one half rate TCH. This additional transmission is needed only when there is high load in the cell and, therefore common Abis transmission pool that is shared between the cells of a BCF cabinet, utilizes the available Abis transmission capacity efficiently.

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BSS30385: Circuit Switched Dynamic Abis Pool Benefits for the operator


3 Benefits for the operatorThe Circuit Switched Dynamic Abis Pool (CSDAP) feature enables OSC in BTS that have legacy Abis transmission.

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Requirements

4 RequirementsThe following tables list the software and hardware requirements.

4.1 Software requirements

4.2 Hardware requirementsThis feature does not require any new or additional hardware.

Network element Required software release

BSC S15.1

Flexi EDGE BTS EX4.1

Flexi Multiradio BTS EX4.1

UltraSite BTS CX8.1

NetAct OSS5.3 CD SET 2

Table 1 Software requirements for different network elements

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BSS30385: Circuit Switched Dynamic Abis Pool Functional description


5 Functional description

5.1 Functional detailsThe “Circuit switched dynamic Abis pool” feature offers the possibility to create common transmission pools for OSC circuit switched traffic in a BCF cabinet. CSDAPs are con-tinuous blocks of 64 kbit/s physical timeslots. The size of CSDAPs can be selected in 1 timeslot steps. A maximum of 4 CSDAPs can be created in a BCF and 1000 CSDAPs in a BSC. The size of a CSDAP in ETSI can be 1 (minimum) to 31 (maximum) and in ANSI from 1 to 24.

CSDAP is an optional software and can be controlled with a capacity license that is based on the number of CSDAP timeslots in the CSDAPs attached to BCFs. The license is activated by setting the feature state to ON or CONF before the CSDAP is created and then attaching the CSDAP to the BCF. CSDAPs can exist in the same or a different Abis ETPCM as the TRXs using it. All the TRXs existing under a BCF cabinet can use the CSDAPs attached to the BCF. The CSDAP area is independent of the transmission capacity configurations of other TRX objects. Abis transmission is dynamically allocated from CSDAPs.

5.1.1 CSDAP radio network objectCSDAP information is stored to radio network object called Circuit switched dynamic Abis pool (CSDAP). The CSDAP radio network object contains the following informa-tion:

• CSDAP IDEach CSDAP has its own CSDAP ID that is used to identify the CSDAP. And the value of the ID can range between 1 and 1000. The CSDAP ID parameter can be entered during CSDAP creation and once set, the ID cannot be modified.

• Circuit group numberThe BSC allocates its own circuit group number (CMECGR) to each CSDAP during the CSDAP creation, the circuit group number cannot be modified later.

• Abis ETPCMThis parameter defines the Abis ETPCM where the CSDAP situated on the BSC side. The Abis ETPCM parameter can be entered when CSDAP is created and cannot be modified later.

• First timeslotThis parameter defines the first timeslot used for the CSDAP in Abis ETPCM. The first timeslot parameter can be entered when CSDAP is created and can be modified later, but not simultaneously with last timeslot parameter. BSC does not allow mod-ification if the first timeslot is greater than the last timeslot (always first timeslot less than last timeslot)

• Last timeslotThis parameter defines the last timeslot used for the CSDAP in Abis ETPCM. The last timeslot parameter can be entered when CSDAP is created and can be modified later but not simultaneously with first timeslot parameter. BSC does not allow mod-ification if the first timeslot is greater than the last timeslot.

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Functional description

• BCF Abis IFThis parameter defines the Abis IF number in BCF site. The BCF Abis IF parameter can be entered when CSDAP is created and can be modified later while the CSDAP does not have attachment to the BCF. This parameter is not used by UltraSite BTS.

• BCF timeslot shiftThis parameter defines the offset between CSDAP timeslots in Abis ETPCM and BCF Abis IF. The BCF Timeslot Shift parameter can be entered when CSDAP is created and can be modified later while the CSDAP does not have attachment to BCF. This parameter is not used by UltraSite BTS.

There can be a maximum of 4 separate CSDAPs attached to one BCF, but a single CSDAP can be connected to only one BCF.

5.1.2 Supervising CSDAPThe BSC detects the connection problems with the BTS that affect the CSDAP. When the BSC detects a point to point malfunction in CSDAP, it stops hunting resources from the CSDAP and sets a penalty timer for the CSDAP. BSC also sets an alarm3536 CIRCUIT SWITCHED DYNAMIC ABIS POOL FAILURE to indicate the situation. A point to point malfunction is defined to happen when several consecutive calls using certain CSDAP are released because of remote transcoder failure.

When the penalty timer expires BSC checks the working circuits in CSDAP circuit group before it allows resource allocation from the CSDAP. If there are working circuits avail-able, BSC allows traffic on CSDAP and cancels the alarm indicating the CSDAP problem.

5.2 Functional splitBSCThe BSC handles the following functions of the CSDAP feature:

• Stores CSDAP configuration information in radio network database. • Stores CSDAP circuit routings (circuits groups). • Delivers CSDAP configuration to BTS in BTS_CONF_DATA message. • Finds resources from CSDAP before OSC-1 channel activation. • Sends Abis transmission information to BTS in the Channel Activation message

when the OSC-1 channel is activated.

BTSThe BTS handles the following functions of the CSDAP feature:

• Receives CSDAP configuration from BSC in BTS_CONF_DATA messages. • Receives Abis transmission information to be used for OSC-1 call in Channel Acti-

vation message.

NetActNetAct is responsible for supporting CSDAP object class parameters and alarms with a valid license. It is also responsible for handling the measurements and counters.

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BSS30385: Circuit Switched Dynamic Abis Pool System impacts

Id:0900d8058085433cConfidential

6 System impactsThis chapter is divided into the following sections: • “Relations to other features” • “Impacts on SoC” • “Impacts on interfaces”

6.1 Relations to other featuresCircuit switched dynamic Abis pool is related to the following features:

• BSS21309 “OSC Half Rate with SAIC MS” and BSS21534 “OSC Full Rate with SAIC MS”When the OSC half rate/full rate feature is in use, it always requires additional Abis transport capacity for the OSC-1 connection in a half rate/full rateTCH channel. The additional Abis transport capacity can be provided by the Circuit switched dynamic Abis pool feature.

• BSS21325 “8k TRAU for OSC AMR FR”8k TRAU for OSC AMR FR feature is an alternative way to offer legacy Abis trans-port for OSC full rate feature. There is no need for additional Abis transport capacity for OSC full rate feature but system restricts Abis bandwidths of both multiplexed AMR FR calls (OSC-0 and OSC-1) to 8kbit/s by allowing AMR codecs only up to 7.4kbit/s and then utilizing 8kbits/s TRAU frames on Abis. The OSC-0 call is trans-ferred in the first half of the 16kbit/s Abis timeslot and the OSC-1 call in the second half of the 16kbit/s Abis timeslot that is fixedly allocated for a full rate TCH. Both the Circuit swithched dynamic Abis pool feature and the 8k TRAU for OSC AMR FR feature can be active in BSC at the same time. The BSC makes the selection between CSDAP mode and 8k TRAU mode for OSC full rate on the basis of the parameter 8k TRAU for DFR Enabled (BTS).

6.2 Impacts on SoCThe Circuit switched dynamic Abis pool has effects on “3GPP TS 48.058 base station controller – base transceiver station (BSC – BTS) interface layer 3 specification”. For more information on effects according to the interface impacts, see section Impacts on intefaces.

6.3 Impacts on interfacesAbis telecom interfaceThe BSC deploys CSDAP on a call-by-call basis. It gives the CSDAP resources to BTS in the Channel activation message. Fields have been added to the following information elements:

• CSDAP resource is defined in the Channel activation message as a conditional CSDAP Circuit IE.

• CSDAP Circuit IE shall only be present when OSC is deployed and OSC-1 subchan-nel is indicated.

• CSDAP Circuit IE (CSDAP resource for OSC-1 subchannel).

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System impacts

A proprietary element 'Bits on Abis' in the 3rd octet of Channel Mode IE indicates number of used Abis bits when CSDAP Circuit IE is present in Channel Activation message.

Abis O&M interfaceBSC provides CSDAP configuration for the BTS.

• BTS_CONF_DATA (fields for CSDAP) • BSC can request BTS to perform Abis loop test for CSDAP circuit • BTS_TEST_REQ (ABIS_LOOP_TEST) (Testing of CSDAP circuits is indicated with

CSDAP id) • BTS_TEST_REPORT (ABIS_LOOP_TEST)

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BSS30385: Circuit Switched Dynamic Abis Pool User interface


7 User interfaceThis chapter is divided into the following sections: • “Parameters” • “MML commands” • “System responses to failures” • “Alarms” • “Measurements and counters”

7.1 ParametersThe following table shows the parameters implemented for the “Circuit switched dynamic Abis pool” feature. The parameters are subject to change.

Name Object Description Range Default value

CSDAP ID

(CID)

CSDAP This parameter identifies the dynamic Abis pool in a BSC. The identification number must be unique within the BSC.

1 to 1000, step 1

0xFFFF (65535)

Circuit Group Number CSDAP This parameter identifies the circuit group number of a CSDAP that has been created.

0 to 65535, step 1

PCM Circuit ID

(circuit)

CSDAP This parameter defines the Abis interface ET-PCM number for the CSDAP.

0 to 3391, step 1

Circuit

(CRCT)

CSDAP The parameter defines the Abis interface ET-PCM number and the time slots reserved from the ET-PCM for the Circuit switched dynamic Abis pool.

0 to 3391, step 1

First Timeslot

(CRCT, NFT)

CSDAP This parameter defines the first time slot of the CSDAP. The time slots are entered as time slot numbers. When first timeslot is modified then the parameter is defined with NFT.

1 to 31, step 1

Last Timeslot

(CRCT, NLT)

CSDAP This parameter defines the last time slot of the CSDAP. The time slots are entered as time slot numbers. When last timeslot is modified the parameter is defined it with NLT.

1 to 31, step 1

Pool Size

(SIZE)

CSDAP This parameter defines the pool size. 1 to 31, step 1

Table 2 Parameters for Circuit switched dynamic Abis pool

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User interface

7.2 MML commandsThe following MML commands are used in this feature: • The ESB command for displaying a CSDAP. • The EST command for creating CSDAPs. • The ESU command for modifying CSDAPs. • The ESV command for deleting CSDAPs. • The UBK command for handling Abis loop test. • The UBP command for printing test report.

7.3 System responses to failuresThis feature introduces the error codes shown in the following table.

BCF Abis IF

(BAIF)

CSDAP This parameter identified the BCF Abis number in the BCF side.

g Valid BAIF parameter range depends on transport sub-module being used on Flexi BTS.

E1/T1 mode : 1 to 8

FIFA : 1 to 16

FIQB/FIYB : 1 to 4

This parameter is not used by Ultra-Site BTS.

1 to 16, step 1 0

BCF Timeslot Shift

(SHIFT)

CSDAP This parameter identifies the offset between ETPCM timeslots in the BSC side and Abis IF timeslots in the BCF side.

g This parameter is not used by Ultra-Site BTS.

-30 to 30, step 1

0

Attached CSDAP 1..4

(CSDAP ID 1..4)

BCF This parameter identifies the circuit switched dynamic Abis pool that is attached to the BCF.

1 to 1000 0xFFFF (65535)

CSDAP Penalty Duration

PAFILE This parameter defines duration of CSDAP penalty timer. BSC sets penalty for a certain CSDAP in case of consecu-tive remote transcocder failures and hunting error(s).

1 to 255 seconds

90 seconds

CSDAP Penalty Threshold

PAFILE This parameter defines the amount of con-secutive remote transcoder failures after which CSDAP supervision considers the CSDAP as malfunctioned.

0 to 255 (0= penalty not in use)

5

Name Object Description Range Default value

Table 2 Parameters for Circuit switched dynamic Abis pool (Cont.)

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Output Number Description

CSDAP FEATURE IS NOT IN USE IN BSC

002FBH The CSDAP feature cannot be used due to the fact that there is no licence installed in the BSC, the licence has expired, or the licence is in the wrong state.

CSDAP CAPACITY LICENCE EXCEEDED

002FCH Capacity of the CSDAP licence is exceeded.

THE BCF INTERFACE OF THE FIRST CSDAP IS NOT IN USE IN BTS SITE

00355H The first CSDAP interface is not in use in the BTS site.

THE BCF INTERFACE OF THE SECOND CSDAP IS NOT IN USE IN BTS SITE

00356H The second CSDAP interface is not in use in the BTS site.

THE BCF INTERFACE OF THE THIRD CSDAP IS NOT IN USE IN BTS SITE

00357H The third CSDAP interface is not in use in the BTS site.

THE BCF INTERFACE OF THE FOURTH CSDAP IS NOT IN USE IN BTS SITE

00358H The fourth CSDAP interface is not in use in the BTS site.

THE TIMESLOT OF THE FIRST CSDAP EXCEEDS THE E1/T1 BOUNDS

00359H The first CSDAP timeslot exceed the E1/T1 bounds.

THE TIMESLOT OF THE SECOND CSDAP EXCEEDS THE E1/T1 BOUNDS

0035AH The second CSDAP timeslot exceed the E1/T1 bounds.

THE TIMESLOT OF THE THIRD CSDAP EXCEEDS THE E1/T1 BOUNDS

0035BH The third CSDAP timeslot exceed the E1/T1 bounds.

THE TIMESLOT OF THE FOURTH CSDAP EXCEEDS THE E1/T1 BOUNDS

0035CH The fourth CSDAP timeslot exceed the E1/T1 bounds.

Table 3 Error codes

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THE FIRST CSDAP TIMESLOT IS OVERLAPPING WITH OTHER ABIS RESOURCES

0035DH The first CSDAP timeslots are overlap-ping with other Abis resources.

THE SECOND CSDAP TIMESLOT IS OVERLAPPING WITH OTHER ABIS RESOURCES

0035EH The second CSDAP timeslots are over-lapping with other Abis resources.

THE THIRD CSDAP TIMESLOT IS OVERLAPPING WITH OTHER ABIS RESOURCES

0035FH The third CSDAP timeslots are overlap-ping with other Abis resources.

THE FOURTH CSDAP TIMESLOT IS OVERLAPPING WITH OTHER ABIS RESOURCES

00360H The fourth CSDAP timeslots are overlap-ping with other Abis resources.

CSDAP RESOURCES ARE UNAVAILABLE

00361H Circuit switched dynamic Abis pool does not exist or the timeslot does not belong to CSDAP.

CSDAP IS NOT FOUND 003C0H Circuit Switched Dynamic Abis Pool is not found.

CSDAP VALUE IS OUT OF RANGE

003C1H The configured Circuit Switched Dynamic Abis Pool value is out of range.

CSDAP IS ATTACHED TO BCF AND CANNOT BE DELETED

003C2H Circuit Switched Dynamic Abis Pool is attached to BCF and therefore CSDAP cannot be deleted until detached from BCF.

CSDAP IS ALREADY ATTACHED TO BCF

003BAH CSDAP has already been attached to a BCF.

BCF CSDAP IS ALREADY USED

003EDH BCF already has another attached csdap in index.

CSDAP IS ALREADY DETACHED FROM BCF

003EEH CSDAP IS ALREADY DETACHED FROM BCF.

BCF HAS CSDAP CONFIGURED

00409H BCF HAS CSDAP CONFIGURED.

BCF PARAM AND CSDAP ID CANNOT BE MODIFIED TOGETHER

00437H BCF parameters cannot be modified together with an attach/detach operation.


Table 3 Error codes (Cont.)

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7.4 AlarmsThe following are the CSDAP alarms:

7.5 Measurements and countersCircuit switched dynamic Abis pool call control measurementThe CSDAP measurement reports performance measurement data about the CSDAP usage rate. This is reported in the CSDAP ID level and helps to optimize the size of the CSDAP. There are four counters for this measurement.

OSC CANNOT OPERATE WITHOUT CSDAP OR PACKET ABIS

00470H OSC (Orthogonal Sub Channel) feature cannot operate without Circuit Switched Dynamic Abis Pool or Packet Abis in use.


Table 3 Error codes (Cont.)

Error ID Alarm string Fault condition

3536 CIRCUIT SWITCHED DYNAMIC ABIS POOL FAILURE

• Several consecutive remote transcoder failures are detected on CSDAP.

• Several consecutive hunting errors are detected on CSDAP.

• Channel activation failure because of CSDAP error.

• Missing CSDAP configuration. The BCF does not have any CSDAP attached.

• CSDAP feature is not active. CSDAP resource allocation attempt has occurred while the feature is inactive.

Table 4 Alarms for the feature

Counter Number Description

TOTAL PCM 8 KBIT/S SUBTSLS IN CSDAP

121000 The counter is updated by the size of the CSDAP once in a measure-ment period.

AVERAGE CSDAP 8 KBIT/S SUBTSL USAGE

121001 The number of the busy 8 kbit/s sub-timeslots is sampled every 20 seconds. The number of the busy 8 kbit/s sub-timeslots is updated when an 8 kbit/s sub-timeslot resource is allocated or released.

AVERAGE CSDAP 8 KBIT/S SUBTSL USAGE DENOMINATOR

121002 The counter is updated every 20 seconds when a sample of the busy 8 kbit/s sub-timeslot number is taken.

PEAK CSDAP 8 KBIT/S SUBTSL USAGE

121003 The counter is updated when the number of reserved 8 kbit/s sub-timeslots exceeds the previous peak value.

Table 5 Counters for CSDAP call control measurement

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User interface

Circuit switched dynamic Abis pool traffic measurementThe CSDAP traffic measurement counters are as below:

Counter Number Description

CSDAP RESOURCE ALLOCATION ATTEMPTS FOR DHR

001265 Number of CSDAP resource allocation attempts for OSC Double Half Rate.

DHR MULTIPLEXING FAILURE DUE TO CSDAP RESOURCE

001266 Number of times OSC Double Half Rate multiplexing is triggerred but CSDAP resource allocation fails because of CSDAP congestion, CSDAP being out of order due to failure, CSDAP hunting timer expiry or CSDAP hunting error.

CSDAP RESOURCE ALLOCATION ATTEMPTS FOR DFR

001295 Number of CSDAP resource allocation attempts for OSC Full Rate.

DFR MULTIPLEXING FAILURE DUE TO CSDAP RESOURCE

001296 Double full rate multiplexing has triggerred but CSDAP resource alloca-tion fails because of CSDAP congestion, CSDAP being out of order due to failure, CSDAP hunting timer expiry or CSDAP hunting error.

Table 6 CSDAP counters for traffic measurement

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BSS30385: Circuit Switched Dynamic Abis Pool Activating and Deactivating the feature

Id:0900d805807f923cConfidential

8 Activating and Deactivating the featureThis chapter provides the procedures to operate the feature “Circuit switched dynamic Abis pool”.

• "Activating the Circuit switched dynamic Abis pool feature" • "Deactivating the Circuit switched dynamic Abis pool feature"

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Activating and Deactivating the feature

8.1 Activating the Circuit switched dynamic Abis pool featurePrerequisites • Valid licence for CSDAP is installed • Flexi EDGE BTS SW EX 4.0 • Zero circuit is created

1 Print all the circuits to check if a circuit group exists for Null PCM (RCI)RCI:SEA=3:CGR=all_circuits:PRINT=4;

If some circuit group contains PCM-TSL 0-1 then routing has been already done for a null circuit. Proceed to step 4.

2 Create a circuit group for Null PCM (RCC).ZRCC:TYPE=SPE,NCGR=<circuit group name>,CGR=<circuit group number>:FORMAT=0,HUNTED=N;

3 Add circuits to the circuit group for Null PCM (RCA).ZRCA:NCGR=<circuit group name>:CRCT=0-0&-1;

4 Activate the feature in the BSCEnter the following command to activate the feature.

ZW7M:FEA=1671:ON;

5 Create or modify CSDAP related RNW parametersEnter the following command to create a new CSDAP in the RNW database:

ZEST:CID=<CSDAP ID>,CRCT=<CIRCUIT IDENTIFICATION>-<start tsl>&&-<end tsl>, BAIF = <BCF Abis IF>, SHIFT=<BCF Timeslot Shift>;

Enter the following command to modify CSDAP parameters to the RNW database:

ZESU:CID=<CSDAP ID>,NFT=<new first timeslot>/NLT=<new last,BAIF = <BCF Abis IF>, SHIFT=<BCF Timeslot Shift>;

Enter the following command to output the CSDAP parameters:

ZESB:CID=<CSDAP ID>;

6 Attach a CSDAP to BCFEnter the following command to attach a new CSDAP to the BCF in the RNW database.

ZEFM:bcf_id::CSDAP1=csdap_pool_id:;

End

DN0963087 21

BSS30385: Circuit Switched Dynamic Abis Pool Activating and Deactivating the feature


8.2 Deactivating the Circuit switched dynamic Abis pool feature

1 Deactivate feature state ON to CONF

2 Detach the CSDAP from BCFZEFM:<bcf id>:::CSDAP1=0,:::;

3 Delete existing CSDAPs ZESV:CID=<CSDAP ID>;

4 Change feature state to OFF

g Even if the CSDAP feature is deactivated, there is no need to remove zero circuit.

End

22 DN0963087



Abbreviations

9 Abbreviations

0 – Z3GPP third generation partnership project

BCF base station control function

BCSU BSC signalling unit

BSC base station controller

BSS base station system

BTS base transceiver station

CAPEX capital expenditures

CSDAP circuit switched dynamic abis pool

DHR double half rate

EDGE enhanced data rates for GSM evolution

ETPCM exchange terminal pulse code modulation

FR full rate

GSM global system for mobile communication

HR half rate

LMU location measurement unit

MMI man machine interface

OPEX operating expenditures

OSC orthogonal subchannel

PCM pulse code modulation

RX receiver

TCH traffic channel

TRX transceiver

TX transmitter

csdap

Engineering