Bss402071 Instant Qos Sigling Dn402071 01 En

GSM/EDGE BSS, Rel. RG10(BSS), Operating Documentation, Issue 08, Doc Change Delivery 1

Feature description

BSS402071: Instant QoS Signaling

DN402071 Issue 01Approval Date 2011-06-16

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Table of ContentsThis document has 16 pages.

1 Introduction to the feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Software requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.2 Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.1 Functional details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 System impacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1 Relations to other features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.2 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.3 Measurements and counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Activating and configuring the feature . . . . . . . . . . . . . . . . . . . . . . . . . . 127.1 Activating and Testing the Instant QoS Signaling feature . . . . . . . . . . . 137.2 Deactivating the Instant QoS Signaling feature . . . . . . . . . . . . . . . . . . . 15

8 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 – Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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List of TablesTable 1 Software requirements for different network elements . . . . . . . . . . . . . . 7Table 2 Hardware requirements for different network elements . . . . . . . . . . . . . . 7Table 3 New and modified counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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BSS402071: Instant QoS Signaling Introduction to the feature

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1 Introduction to the featureThe PS data volumes have risen in the GSM networks and in some networks a large contribution to the PS data traffic comes from Smart Phone applications (like Tencent QQ chat application) which generate signaling type of traffic, that is, short packet flows, only some tens of bytes per PS connection.

The traditional (E)GPRS networks tend to allocate the maximum number of radio timeslots for each PS connection in order to maximize the throughput but with Smart Phone applications this causes low efficiency, that is, the amount of data transferred vs. amount of resources reserved is low. In addition, this causes unnecessary territory upgrades and increases the TBF blocking.

To be more Smart Phone friendly, the feature BSS402071“Instant QoS Signaling” has been introduced to the (E)GPRS network.

In the feature “Instant QoS Signaling” the core network is configured to tag DL PDUs that belong to a certain signaling type of application and PCU allocates only one radio timeslot (RTSL) for a Downlink (DL) Temporary Block Flow (TBF) if the Protocol Data Units (PDUs) to be transferred are tagged. By this the network efficiency is improved as the signaling type of traffic consumes less resources.

This feature is controlled by a BSC level ON/OFF license key.

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Benefits

2 BenefitsThe feature “Instant QoS Signaling” provides the following benefits to the operators:

• It increases the network efficiency as less radio resources are reserved for signaling type of traffic.

• It makes the network more Smart Phone friendly as it allocates resources based on need rather than the handset's multi slot capability.

• It reduces the number of unnecessary territory upgrades and downgrades. • It increases the number of PS users that can be simultaneously accommodated on

the radio resources. • It reduces the TBF blocking as more PS users can be accommodated on the same

radio resources.

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BSS402071: Instant QoS Signaling Requirements

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3 Requirements Following are the requirements for “Instant QoS Signaling” feature:

3.1 Software requirementsThe “Instant QoS Signaling” feature requires the following software:

3.2 Hardware requirementsThe “Instant QoS Signaling” feature requires the following Hardware:

Network element Required software release

BSC S14 EP9.1

SGSN PRE81

GGSN Flexi ISN 40 CD7

Table 1 Software requirements for different network elements

Network element Required Hardware

BSC PCU2

Table 2 Hardware requirements for different network elements

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Functional description

4 Functional descriptionIn the existing implementation, PCU allocates the number of timeslots for a PS connec-tion based on the handset's multi slot capability in order to maximize the throughput that is, PCU gives a multi slot allocation for a TBF even if the amount of data to be transferred is very small, like some tens of bytes. This causes un-efficient resource usage, unnec-essary territory upgrades and increases the TBF blocking.

In the “Instant QoS Signaling” feature the core network is configured to tag DL PDUs that belong to a certain signaling type of application (like Tencent QQ chat application) and PCU allocates only one RTSL for a DL TBF if the DL PDUs to be transferred are tagged. By this the network efficiency is improved as the signaling type of traffic consumes less resources. If un-tagged DL PDUs are received during the data transfer, then the single slot signaling type of TBF is converted to normal TBF (multi slot TBF) by means of TBF reallocation.

The following points gives a brief description of the feature:

• Core network detects that a DL PDU belongs to a certain signaling type of applica-tion.

• Core network tags the DL PDU on the BSSGP protocol layer when the DL PDU is sent to PCU.

• The resource reservation at PCU is made based on the tagging. • Only single timeslot is allocated for the DL TBF if the DL PDU to be transferred is

received with a tag.

Tagging at BSSGP protocol layer:There is a new Service Class Indicator field added to the BSSGP DL-UNITDATA which is used for tagging the DL PDUs belonging to a certain signaling type of application. This Service Class Indicator field has not been specified in the 3GPP standardization as of now but can be used if both peers (SGSN and PCU) supports it.

If the Instant QoS Signaling feature is disabled at BSC, then PCU ignores the Service Class Indicator field.

If the Instant QoS Signaling feature is enabled at BSC, then PCU supports the Service Class Indicator field in the following manner:

• If the Service Class Indicator field value is 0x11, then PCU treats this as a tag for the Instant QoS Signaling application.

• If the Service Class Indicator field value is other than 0x11, then PCU ignores the field value.

4.1 Functional detailsDL TBF establishmentIf the “Instant QoS Signaling” feature is activated, then PCU determines at DL TBF establishment whether a single slot or multi slot allocation is to be given. The different scenarios are:

• DL TBF establishment on CCCHAt the time of allocation, if all the buffered DL PDUs are Instant QoS Signaling tagged, then the PCU allocates only one timeslot for the DL TBF. Otherwise, multi slot is allocated for the DL TBF.

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BSS402071: Instant QoS Signaling Functional description

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• DL TBF establishment on PACCH of UL TBFAt the time of allocation, if all the buffered DL LLC PDUs are Instant QoS Signaling-tagged, then PCU allocates only one timeslot for the DL TBF. Otherwise, multi slot is allocated for the DL TBF. PCU allocates the Instant QoS Signaling type of 1-TS DL TBF beside the UL TBF with or without UL TBF reallocation.

Resource reallocationIf PCU receives un-tagged DL PDUs for an MS that is, having a Instant QoS Signaling type of 1-TS DL TBF, then a resource reallocation is triggered by the PCU to give more DL TSLs for the DL TBF. In this procedure the Instant QoS Signaling type of 1-TS DL TBF is converted to a normal TBF. Reverse reallocation from normal DL TBF to Instant QoS Signaling type of 1-TS DL TBF is not supported.

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System impacts

5 System impactsThis section describes the interaction of “Instant QoS Signaling” feature with other fea-tures.

5.1 Relations to other features • BSS20088: Dual Transfer Mode

PCU does not support the Instant QoS Signaling feature for DTM TBFs. • BSS21228: Downlink Dual Carier (DLDC)

DLDC resources are not allocated for the MS with Instant QoS Signaling type of 1-TSL DL TBF.

• BSS402059: Smart Resource AdaptationIf SRA (Smart Resource Adaption) and Instant QoS Signaling features are enabled then PCU determines whether a single slot or multi slot allocation is to be given at DL TBF establishment.At the time of allocation, if all the buffered DL LLC PDUs are either short in size (less than 250 bytes) or QQ-tagged (they belong to the Instant QoS Signaling applica-tion), then PCU allocates only one timeslot for the DL TBF. Otherwise, the DL TBF is allocated in a normal way.PCU specifies whether the singleslot DL TBF is an SRA type of DL TBF or Instant QoS Signaling type of DL TBF. This is done at the TBF establishment as follows: • If all buffered LLC PDUs are short and without the Instant Qos Signaling tag at

the time of TBF establishment, then the DL TBF is a SRA type of DL TBF • If atleast one PDU is Instant QoS Signaling tagged, then the DL TBF is a Instant

QoS Signaling type of DL TBF.

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BSS402071: Instant QoS Signaling User interface

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6 User interfaceThis chapter is divided into the following sections: • “Parameters” • “Alarms” • “Measurements and counters”

6.1 ParametersThe “ Instant QoS Signaling” feature does not introduce any new parameters or change in the existing parameters.

6.2 AlarmsThe “Instant QoS Signaling” feature does not introduce any new alarms.

6.3 Measurements and countersFollowing are the measurement and counters related to the “Instant QoS Signaling” feature.

New counters for: 072– Packet Control Unit Measurement

Counter Number

SPARE072239 072239

SPARE072240 072240

Table 3 New and modified counters

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Activating and configuring the feature

7 Activating and configuring the featureThis chapter provides the procedures to operate “ Instant QoS Signaling” feature.

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BSS402071: Instant QoS Signaling Activating and configuring the feature

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7.1 Activating and Testing the Instant QoS Signaling featurePrerequisites • To operate the feature, the license for BSS402071: “Instant QoS Signaling” feature

must be installed in BSC.

1 Check the license status of the feature using W7I command.ZW7I:FEA,FULL:FEA=3430;

2 If the license is not on, turn it on using W7M command.ZW7M:FEA=3430:ON;

End

Testing the feature

Prerequisites for testing • BTS software Ultrasite CX8 and above. • The corenetwork should be configured to support for Instant QoS Signaling feature. • QQ server should be available at GGSN side. • EGPRS enabled BTS with one TRX. • EGPRS capable MS.

Test executionFollowing are the steps for verifying the feature Instant QOS Signaling

1. Modify PCU measurements (TPM)ZTPM:GPRS,PCU:ALL,0-0-24-0,15:;

2. Start PCU measurement (TPS)ZTPS:GPRS,PCU::;

3. Make a PS call by sending PING packets to the QQ server.4. Check that single timeslot is allocated for the message (ZERO)5. Stop the PCU measurement (TPE)6. Start PCU measurement (TPS)

ZTPS:GPRS,PCU::;7. Make a PS call by sending PING packets to a non QQ server.8. Check that multiple timeslot is allocated for the call (ZERO)9. Stop the PCU measurement (TPE)

Expected results

1. Call is successful after exection of step 3.2. Single timeslot is allocated for the message after exection of step 4.3. The counter SPARE072239 is updated after exection of step 5.4. Call is successful after exection of step 7.5. Multiple timeslots are allocated for the call after exection of step 8.

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Activating and configuring the feature

6. When the PCU measurement is completed the following counters are not updated after exection of step 9.as PING packets are send to non QQ server. • SPARE072239 • SPARE072240

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BSS402071: Instant QoS Signaling Activating and configuring the feature

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7.2 Deactivating the Instant QoS Signaling featurePrerequisites • To operate the feature, the license for BSS402071: “Instant QoS Signaling” must be

installed in BSC.

1 Turn the license of the feature to OFF using W7M command.ZW7M:FEA=3430:OFF;

2 Check the license status of the feature using W7I command.ZW7I:FEA,FULL:FEA=3430;

End

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Abbreviations

8 Abbreviations

0 – ZBSSGP Base Station System GPRS Protocol

CCCH Common Control Channel

DL Downlink

EDA Extended Dynamic Allocation

LLC Logical Link Control

MS Mobile Station

PCU Packet Control Unit

PDU Protocol Data Unit

SRA Smart Resource Allocation

TBF Temporary Block Flow

TSL Time Slot

PACCH Packet Associated Control Channel

Bss402071 Instant Qos Sigling Dn402071 01 En

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