common transmission resource management on mbsc(sran7.0_01)

SingleRAN

Common Transmission ResourceManagement on MBSC FeatureParameter Description

Issue 01

Date 2012-04-30

HUAWEI TECHNOLOGIES CO., LTD.

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Issue 01 (2012-04-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

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Contents

1 About This Document..................................................................................................................11.1 Scope..............................................................................................................................................................................11.2 Intended Audience..........................................................................................................................................................11.3 Change History...............................................................................................................................................................1

2 Overview.........................................................................................................................................32.1 Definition........................................................................................................................................................................32.2 Networking Requirements..............................................................................................................................................32.3 Benefits...........................................................................................................................................................................32.4 Feature Contents.............................................................................................................................................................4

3 Transmission Resources...............................................................................................................53.1 IP Physical Transmission Resources..............................................................................................................................63.2 IP LP Resources..............................................................................................................................................................63.3 IP Path Resources...........................................................................................................................................................6

4 Load Control...................................................................................................................................74.1 Common Load Thresholds.............................................................................................................................................84.2 Admission Control..........................................................................................................................................................84.2.1 Admission Decision.....................................................................................................................................................94.2.2 Preemption.................................................................................................................................................................104.2.3 Queuing.....................................................................................................................................................................104.3 Congestion Control and Overload Control...................................................................................................................114.3.1 Congestion Detection................................................................................................................................................114.3.2 Overload Detection....................................................................................................................................................114.3.3 Congestion and Overload Handling..........................................................................................................................11

5 Engineering Guidelines.............................................................................................................13

6 Parameters.....................................................................................................................................14

7 Counters........................................................................................................................................20

8 Glossary.........................................................................................................................................21

9 Reference Documents.................................................................................................................22

SingleRANCommon Transmission Resource Management on MBSCFeature Parameter Description Contents


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1 About This Document

1.1 ScopeThis document describes the common management of transmission resources shared by GSMand WCDMA networks over the Abis and Iub interfaces. The management process, known ascommon transmission resource management (Co-TRM), covers the shared transmissionresources, common load control, and related parameters. Certain concepts or functions that areinherited from the original GSM and WCDMA features are not described in detail in thisdocument.

Co-TRM corresponds to feature MRFD-211503 Co-Transmission Resources Management onMBSC.

1.2 Intended AudienceThis document is intended for personnel who:

l Need to understand the features described herein

l Work with Huawei products

NOTE

A good understanding of the functions of Transmission Resource Management (TRM) of GSM andWCDMA is presumed, before this document is read. This knowledge can be achieved through theTransmission Resource Management Feature Parameter Description of the GSM BSS and the WCDMARAN.

1.3 Change HistoryThis section provides information about the changes in different document versions. There aretwo types of changes, which are defined as follows:

l Feature change

Changes in features of a specific product version

l Editorial change

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Changes in wording or addition of information that was not described in the earlier version

01 (2012-04-30)This document is created for SRAN7.0.

This document is split from the Transmission Resource Management Feature ParameterDescription of issue Draft A (2012-02-15) of SRAN7.0.

SingleRANCommon Transmission Resource Management on MBSCFeature Parameter Description 1 About This Document


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2 Overview

2.1 DefinitionCo-TRM refers to the common management of transmission resources when the IP transmissionbandwidth is shared by the GSM and UMTS services of the Multimode Base Station. Co-TRMimproves the usage of transmission resources and ensures the transmission quality of services(QoS).

In the Co-TRM feature,

l The GSM and UMTS services of the Multimode Base Station share one IP logical port (LP)if the IP over FE/GE is adopted

l The GSM and UMTS services of the Multimode Base Station share the PPP link/MLPPPgroup if the IP over E1/T1 is adopted.

MBSC uniformly implement load control and traffic shaping in the shared IP LPs, PPP links,or MLPPP group.

2.2 Networking RequirementsThe Co-TRM networking must meet the following requirements:

l The GSM+UMTS dual-mode controllers and the GSM+UMTS dual-mode base stationsare deployed.

l The GSM+UMTS dual-mode base stations share IP transmission resources over the Abisand Iub interfaces.

For details about the common transmission networking, see the Common Transmission FeatureParameter Description.

2.3 BenefitsThe bandwidth resources are shared by the GSM and UMTS services between the MBSC andthe Multimode Base Station in resource pool manner. The uniform management of the bandwidthresources provides the following benefits:

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In case of a burst of GSM and UMTS services on the Multimode Base Station, the requiredtransmission bandwidth increases abruptly. In such a case, the MBSC performs the control andthus effectively reduces the possibility of congestion.

For the bandwidth allocated to the GSM and UMTS services on the same Multimode BaseStation, the MBSC uses appropriate allocation policies to increase the usage of the transmissionbandwidth.

2.4 Feature ContentsThe main contents of the Co-TRM feature are as follows:

l Transmission resources: In Co-TRM, the transmission resources, including IP LPs and IPphysical resources, are shared by the Abis and Iub interfaces. For details, see chapter "3Transmission Resources."

l Load control: Common load control is implemented within the IP LPs/PPP links/MLPPPgroups on the Abis and Iub interfaces. As the QoS is ensured, more users are admitted. Fordetails, see chapter "4 Load Control."

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3 Transmission Resources

IP transmission resources include IP path resources, IP Logical Port (LP) resources, and physicaltransmission resources. In the case of Co-TRM, the Abis and Iub interfaces share IP LPs/PPPlinks/MLPPP groups, and IP LPs/PPP links/MLPPP groups share IP physical transmissionresources. Figure 3-1 shows examples of all types of transmission resources and the relationsbetween the resources.

Figure 3-1 Examples of transmission resources in the case of Co-TRM

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3.1 IP Physical Transmission ResourcesThe IP physical transmission resources are as follows:

l FE/GE Ethernet portl GE Ethernet portl Channelized STM-1/OC-3 port

Table 3-1 lists the shared interface boards for IP transmission in Co-TRM.

Table 3-1 Shared interface boards for IP transmission in Co-TRM

IP Interface Board IP Transmission Port atthe Physical Layer

Transmission Protocol atthe Data Link Layer

FG2c FE/GE port IP over Ethernet

GOUc GE port

POUc Channelized STM-1/OC-3port

PPPMLPPP

3.2 IP LP ResourcesIP LPs are used to configure bandwidth for transmission nodes and perform bandwidth-basedadmission and traffic shaping to prevent congestion. Co-TRM allows the services on the Abisand Iub interfaces to share the bandwidth within a logical port, thus implementing commonadmission control and traffic shaping. For details about IP LPs, see the Transmission ResourceManagement Feature Parameter Description of the WCDMA RAN and the GSM BSS.

NOTE

In Co-TRM, IP LPs support five levels of aggregation.

3.3 IP Path ResourcesIn Co-TRM, GSM IP paths and WCDMA IP paths are independent of each other. They are notdescribed in this document. For details about IP path resources, see the Transmission ResourceManagement Feature Parameter Description of the WCDMA RAN and the GSM BSS.

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4 Load Control

The load control algorithm manages the transmission bandwidth and controls the transmissionload. As the QoS is ensured, more users are admitted. This document focuses on the commonload control performed within the IP LPs/PPP links/MLPPP groups on the Abis and Iubinterfaces.

Load control applies to the admission process based on transmission resources. With the changeof transmission bandwidth, different load control functions are used. Load control involvesadmission control, congestion control, and overload control.

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4.1 Common Load ThresholdsIn the admission process based on transmission resources, load and threshold are compared todetermine whether the admission is successful. Transmission load and admission threshold arecompared to determine whether the admission of a new user is successful; transmission load andcongestion control threshold are compared to trigger the congestion control process;transmission load and overload control threshold are compared to trigger the overload controlprocess. The common load control of IP LPs/PPP links/MLPPP groups is based on commonload thresholds.

l Common handover reserved threshold (common admission control of a new user)l Common congestion control thresholdsl Common overload control thresholds

For details about admission control thresholds, congestion control thresholds, and overloadcontrol thresholds, see sections "4.2 Admission Control" and "4.3 Congestion Control andOverload Control."

A load threshold index list can be configured for a group of LPs/PPP links/MLPPP groupsthrough the ADD TRMLOADTH command.

4.2 Admission ControlAdmission control is used to determine whether the transmission resources are sufficient toaccept the admission request from a user. If the transmission resources are sufficient, theadmission request is admitted; otherwise, the request is rejected.

Figure 4-1 shows the admission control during the request for transmission resources.



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Figure 4-1 Admission control during the request for transmission resources

As shown in Figure 4-1, when the users request transmission resources, the admission controlprocess is as follows:

1. The admission of transmission resources is decided. If the admission is successful, a usercan obtain transmission resources. If the admission fails, go to 2. For details aboutadmission decision, see section "4.2.1 Admission Decision."

2. The attempt to preempt resources is made. If the preemption is successful, a user can obtaintransmission resources. If the preemption fails or the preemption function is not supported,go to 3. For details about preemption, see section "4.2.2 Preemption."

3. The attempt for queuing is made. If the queuing is successful, a user can obtain transmissionresources. If the queuing fails or the queuing function is not supported, the admission basedon transmission resources fails. For details about queuing, see 4.2.3 Queuing.

4.2.1 Admission DecisionMBSC provides a common handover reserved threshold. When the transmission bandwidthexceeds the threshold, the threshold-based admission of the newly accessed GSM and UMTSuser is prohibited. This avoids the situation that the handover cannot be performed and the callquality of the accessed users is affected because the transmission resources are exhausted.

When the transmission bandwidth exceeds the threshold and there is bandwidth available forthe transmission, the GSM and UMTS handover users can still perform the threshold-basedadmission.



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4.2.2 PreemptionIn the case of preemption, a high-priority user preempts the bandwidth from an admitted low-priority user for admission of transmission resources.

If the admission based on IP LP/PPP link/MLPPP group resources fails, the GSM and WCDMAnetworks trigger the preemption function separately when the following conditions are met:

l The user who requests transmission resources supports preemption as defined in the userrequest.

l The preemption function is enabled. The preemption switches of the GSM and WCDMAnetworks are set separately.

– In the GSM network, the preemption function is enabled through theENPREEMPTTRANSADMT parameter.

– In the WCDMA network, the preemption function is enabled through thePreemptAlgoSwitch parameter.

The preemption function works separately in the GSM and WCDMA networks. That is, a high-priority GSM user preempts only a low-priority GSM user, and a high-priority WCDMA userpreempts only a low-priority WCDMA user.

The Co-TRM feature inherits the preemption function from the original GSM and WCDMAfeatures. They are not described in this document. For details about preemption, see theTransmission Resource Management Feature Parameter Description of the WCDMA RAN andthe GSM BSS.

4.2.3 QueuingIn the queuing function, the user that requests transmission resources in the GSM or WCDMAnetwork is put in a separate queue to wait for free transmission resources.

If the user that requests transmission resources does not support the preemption function or thepreemption function fails, the GSM and WCDMA networks trigger the queuing functionseparately when the following conditions are met:

l The user that requests transmission resources supports queuing as defined in the userrequest.

l The queuing function is enabled. The queuing switches of the GSM and WCDMA networksare set separately.

– In the GSM network, the queuing function is enabled through theENQUETRANSADMT parameter.

– In the WCDMA network, the queuing function is enabled through theQueueAlgoSwitch parameter.

The Co-TRM feature inherits the queuing function from the original GSM and WCDMAfeatures. They are not described in this document. For details about queuing, see theTransmission Resource Management Feature Parameter Description of the WCDMA RAN andthe GSM BSS.



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4.3 Congestion Control and Overload ControlCongestion control is used to prevent overload, reduce the transmission load, and increase theaccess success rate. Overload control is used to quickly eliminate overload when transmissionoverload occurs, and to reduce the adverse impact on high-priority users.

In Co-TRM, IP LPs/PPP links/MLPPP groups implement common congestion detection andoverload detection and define common congestion control thresholds.

This section describes the congestion control and overload control of IP LP/PPP link/MLPPPgroup resources. The congestion control and overload control include:

l Congestion detectionl Overload detectionl Congestion and overload handling

4.3.1 Congestion DetectionThe Co-TRM feature defines the common congestion control thresholds, based on which IP LPs/PPP links/MLPPP groups implement common congestion detection.

The congestion control thresholds are as follows:

l Congestion remain threshold: When the usage of transmission resources exceeds thecongestion remain threshold, the system considers that congestion occurs.

l Congestion clear remain threshold: When the usage of transmission resources falls belowthe congestion clear remain threshold, the system considers that congestion is cleared.

For parameters associated with the congestion detection thresholds, see section "4.1 CommonLoad Thresholds."

4.3.2 Overload DetectionThe Co-TRM feature defines common overload control thresholds, based on which IP LPs/PPPlinks/MLPPP groups implement common overload detection.

The overload control thresholds are as follows:

l Overload remain threshold: When the usage of transmission resources exceeds the overloadremain threshold, the system considers that overload occurs.

l Overload clear remain threshold: When the usage of transmission resources falls below theoverload clear remain threshold, the system considers that overload is cleared.

For parameters associated with the overload detection thresholds, see section "4.1 CommonLoad Thresholds."

4.3.3 Congestion and Overload HandlingWhen transmission resource congestion occurs, congestion control is started. During thecongestion control, the bandwidth requested by new GSM users and the bandwidth occupied bythe admitted GSM and WCDMA users are reduced. When transmission resource congestion iscleared, congestion control is stopped.



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When transmission resource overload occurs, overload control is started. During the overloadcontrol, the admission of GSM and WCDMA users is prohibited and the bandwidth occupiedby low-priority users is released. When overload is cleared, overload control is stopped.

When the bandwidth is released, GSM and WCDMA networks reserve bandwidth according tothe configured proportion and also release the occupied bandwidth. If the bandwidth in onenetwork cannot be released and overload is not cleared, the bandwidth in the other network isreleased. The bandwidth reservation proportion of the GSM and WCDMA networks is specifiedby the GSMBWRATE parameter.

In Co-TRM, congestion and overload of the GSM and WCDMA networks are handledseparately. The Co-TRM feature inherits the congestion and overload handling methods fromthe original GSM and WCDMA features. They are not described in this document. For detailsabout congestion and overload handling, see the Transmission Resource Management FeatureParameter Description of the WCDMA RAN and the GSM BSS.



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5 Engineering Guidelines

The requirements for co-transmission networking at the MBSC are as follows:

l GSM+UMTS dual-mode base station controllers and GSM+UMTS dual-mode basestations are deployed.

l GSM+UMTS multi-mode base stations share IP LP/PPP/MLPPP transmission resourcesover the Abis and Iub interfaces.

In Co-TRM networking, the GSM and UMTS services share LP resources. It is recommendedthat the GSM and UMTS services use a common LP. The principles of configuring bandwidthfor an LP are as follows:

l If an LP is carried on an Ethernet port (ETHER), the bandwidth of the LP should be lowerthan or equal to that of ETHER. Assume that the bandwidth of ETHER could be 5 Mbit/s.Then, the bandwidth of the LP could be 4 Mbit/s.

l If an LP is carried on the PPP link, the bandwidth of the LP should be lower than or equalto that of PPP link.

l If an LP is carried on the MLPPP link, the bandwidth of the LP should be lower than orequal to that of MLPPP link.

SingleRANCommon Transmission Resource Management on MBSCFeature Parameter Description 5 Engineering Guidelines


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6 Parameters

Table 6-1 Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

PreemptAlgoS-witch

BSC6910 SETUQUEUEPREEMPT

WRFD-010660

WRFD-010661

WRFD-010662

WRFD-010663

WRFD-010665

WRFD-010505

WRFD-01066004

WRFD-01061606

WRFD-01066002

WRFD-01066003

WRFD-01066001

WRFD-01061601

WRFD-01061603

WRFD-01061602

WRFD-01061605

WRFD-01061604

MBMS Phase 2

MBMS over Iur

Dynamic PowerEstimation forMTCH

MSCHScheduling

MBMS ChannelAudienceRating Statistics

Queuing andPre-Emption

Inter-FrequencyNeighboringCell Selectionfor MBMS PTPUsers

StreamingService onMBMS

MBMS P2Pover HSDPA

MBMSAdmissionEnhancement

MBMSEnhancedBroadcast Mode

Meaning:Whether preemption issupported.When thisswitch is turnedon, the RNCallowsprivileged usersor services topreempt cellresources fromthe users orservices with thepreemptedattributes andlower priority inthe case of cellresourceinsufficiency.When thisswitch is turnedoff, the RNCterminates theservice for theuser due to thefailure in cellresourceapplication.GUI ValueRange:OFF, ONUnit:None

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WRFD-010616WRFD-01061608WRFD-010626WRFD-010627

MBMSBroadcast ModeMBMS LoadControlMBMSAdmissionControlMBMSTransportResourceManagementMBMS Soft/SelectiveCombiningMBMSIntroductionPackage16/32/64/128Kbps Channel Rateon MBMSMBMS FLC(FrequencyLayerConvergence)/FLD(FrequencyLayerDispersion)FACHTransmissionSharing forMBMS

Actual ValueRange:OFF, ONDefaultValue:OFF



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PreemptAlgoS-witch


WRFD-010660WRFD-010661WRFD-010662WRFD-010663WRFD-010665WRFD-010505WRFD-01066004WRFD-01061606WRFD-01066002WRFD-01066003WRFD-01066001WRFD-01061601WRFD-01061603WRFD-01061602WRFD-01061605WRFD-01061604WRFD-010616WRFD-01061608WRFD-010626WRFD-010627

MBMS Phase 2

MBMS over Iur

Dynamic PowerEstimation forMTCH

MSCHScheduling

MBMS ChannelAudienceRating Statistics

Queuing andPre-Emption

Inter-FrequencyNeighboringCell Selectionfor MBMS PTPUsers

StreamingService onMBMS

MBMS P2Pover HSDPA

MBMSAdmissionEnhancement

MBMSEnhancedBroadcast Mode

MBMSBroadcast Mode

MBMS LoadControl

MBMSAdmissionControl

MBMSTransportResourceManagement

MBMS Soft/SelectiveCombining

Meaning:Whether preemption issupported.When thisswitch is turnedon, the RNCallowsprivileged usersor services topreempt cellresources fromthe users orservices with thepreemptedattributes andlower priority inthe case of cellresourceinsufficiency.When thisswitch is turnedoff, the RNCterminates theservice for theuser due to thefailure in cellresourceapplication.GUI ValueRange:OFF, ONUnit:NoneActual ValueRange:OFF, ONDefaultValue:OFF



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MBMSIntroductionPackage16/32/64/128Kbps Channel Rateon MBMSMBMS FLC(FrequencyLayerConvergence)/FLD(FrequencyLayerDispersion)FACHTransmissionSharing forMBMS



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QueueAlgoSwitch


WRFD-010505 Queuing andPre-Emption

Meaning:Whether queuing issupported.When thisswitch is turnedon and aqueuing-capablePS user initiatesa call, the RNCtries to enablethis user to jointhe queue toincrease theaccess successrate if cellresources areinsufficient andpreemptionfails. When thisswitch is turnedoff, queuing isnot supported ifcell resourcesare insufficient.GUI ValueRange:OFF, ONUnit:NoneActual ValueRange:OFF, ONDefaultValue:OFF



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QueueAlgoSwitch


WRFD-010505 Queuing andPre-Emption

Meaning:Whether queuing issupported.When thisswitch is turnedon and aqueuing-capablePS user initiatesa call, the RNCtries to enablethis user to jointhe queue toincrease theaccess successrate if cellresources areinsufficient andpreemptionfails. When thisswitch is turnedoff, queuing isnot supported ifcell resourcesare insufficient.GUI ValueRange:OFF, ONUnit:NoneActual ValueRange:OFF, ONDefaultValue:OFF



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7 Counters

There are no specific counters associated with this feature.

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8 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

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9 Reference Documents

1. Transmission Resource Management Feature Parameter Description for WCDMA RANand GSM BSS

2. Common Transmission Feature Parameter Description or SingleRAN

SingleRANCommon Transmission Resource Management on MBSCFeature Parameter Description 9 Reference Documents


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