dbs3900 wimax feature configuration guide (qos)

5 QoS

About This Chapter

The WiMAX BS can provide users with five different Quality of Service (QoS) levels. Usersneed to choose the desired QoS level when subscribing to services. This chapter describes thebasic concepts, functions, and implementation method of the QoS feature.

5.1 Overview of QoSThis section describes the definition, purpose, specifications, and impact of the QoS feature.

5.2 Availability of QoSThis section describes the network elements (NEs) involved in the QoS feature and the versionthat supports the QoS feature.

5.3 Description of QoSThe Huawei WiMAX BS provides an end-to-end QoS solution, including the QoS mechanismof the R1 and R6 interfaces.

5.4 Operations Related to QoSThis section describes how to activate and deactivate the QoS feature.

5.5 Maintenance Information of QoSThis section describes the parameters and performance counters related to the QoS feature.

5.6 Reference Information of QoSThe protocols that the QoS feature complies with are IEEE 802.16-2004/Cor2/D3 with latestSRD and WiMAX Forum Network Architecture Release 1.2.0.

DBS3900 WiMAXFeature Configuration Guide 5 QoS

Issue 03 (2010-03-19) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

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5.1 Overview of QoSThis section describes the definition, purpose, specifications, and impact of the QoS feature.

DefinitionQoS is an end-to-end processing mechanism used to guarantee the quality of communicationservices. On a WiMAX network, QoS ensures that users obtain expected service levels in termsof the packet loss rate, delay, jitter, and bandwidth. The QoS feature supported by the HuaweiWiMAX solution is deployed over the R1 and R6 interfaces.

PurposeQoS is used to guarantee the end-to-end service quality. When the network is congested, QoSguarantees reliable data transmission of important services and ensures efficient use of networkresources.

QoS offers operators with effective control over the use of network resources. With QoS, thenetwork supports existing and emerging multimedia services and applications. At the same time,the network can distinguish between services and provide corresponding quality guarantee. Inthis way, multiple services such as voice, video, and data can be converged on the same network.

With QoS, operators can divide users into detailed groups and provide user-specificdifferentiated and value-added services. In this manner, the network becomes more profitableand competitive, thus gaining a big market share.

SpecificationsThe IEEE 802.16e standard defines five service flow QoS scheduling types, that is, the UGS,ertPS rtPS, nrtPS, and BE.

ImpactNone.

TermsTerm Definition

Throughput Throughput is the maximum transmission rate of the tested object(system, equipment, connection, service type) when no packet isdiscarded.

Latency Latency refers to the time it takes for the original data to go through aseries of processing steps such as coding, to be transmitted through thechannel, to arrive at the receiver, and to be decoded.

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Term Definition

Jitter Generally, signals are not simply transmitted on communicationchannels from the transmitter to the receiver in a point-to-point manner.Instead, signals may be amplified or forwarded by repeaters. There is aprocess of storing, processing, and forwarding. In addition, the networkconditions affect the transmission of signals. Therefore, the delay in thesame service flow varies. The variation of packet delay is known aspacket jitter.

Packet loss rate Because of the limited buffer size of network switching equipment andthe interfering signals on the transmission links, packets may get lost onthe transmission links. The packet loss rate is the ratio of the number oflost packets to the number of transmitted packets. The packet loss rateis an important yardstick for measuring the quality of communicationlinks.

Service flow A service flow is a unidirectional transmission service that is providedby the MAC layer and used to transmit packets. A service flow may bea downlink or uplink service flow and provides specific QoS functions.Each service flow can be described with a set of QoS parameters, suchas delay, jitter, and throughput.

IP PATH IP path is a logical link with virtual bandwidth. The logical link is carriedon the physical link in the IP network. IP path is a mechanism to performaccess control for transmission resources.

Acronyms and AbbreviationsAcronym orAbbreviation Expansion

QoS Quality of Service

MS Mobile Station

SS Subscriber Station

MAC Medium Access Control

BS Base Station

UGS Unsolicited grant service

rtPS Real-time polling service

ertPS Extended rtPS

nrtPS Non-real-time polling service

BE Best effort

TOS Type of Service

DSCP Differentiated Service Code Point



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5.2 Availability of QoSThis section describes the network elements (NEs) involved in the QoS feature and the versionthat supports the QoS feature.

NEs InvolvedThe QoS feature requires the joint work of the SS/MS, BS, and ASN-GW. If authentication isrequired, the AAA server must be configured. Table 5-1 lists the NEs involved in the QoSfeature.

Table 5-1 NEs involved in the QoS feature

SS/MS BSASN-GW

AAAServer

DHCPServer M2000

√ √ √ √ - -

NOTE

In Table 5-1, √ is used to mark the NEs that are involved in this feature, and - is used to mark the NEsthat are not involved in this feature.

Version SupportTable 5-2 lists the version that supports the QoS feature.

Table 5-2 Version that supports the QoS feature

Product Version

BS DBS3900 WiMAX V300R002C03

License RestrictionThe usage of the QoS feature is not controlled by a license.

5.3 Description of QoSThe Huawei WiMAX BS provides an end-to-end QoS solution, including the QoS mechanismof the R1 and R6 interfaces.

The IEEE802.16e defines the QoS mechanism of the R1 interface in the WiMAX system. TheQoS mechanism specifies the association between data packets on the MAC layer and aconnection-oriented service flow. Each service flow is granted QoS parameters such as theservice type, delay, jitter, and data rate. Efficient management and scheduling of service flowsguarantees the satisfaction of QoS requirements.

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The QoS mechanism of the R6 interface focuses on transmission resources. It involves thefollowing technologies: mapping between the QoS parameters and the R6 interface transmissionpriority, IP Differentiated Service, and IP flow shaping.

5.3.1 QoS Network ModelThis section describes the QoS network model in the Huawei WiMAX network.

5.3.2 QoS Application Objects and ParametersThis section describes the QoS application objects and parameters.

5.3.3 QoS Transmission ControlThis section describes the QoS transmission control mechanism.

5.3.1 QoS Network ModelThis section describes the QoS network model in the Huawei WiMAX network.

The QoS feature is implemented mainly over the R1 and R6 interfaces. Figure 5-1 shows thesubsystems and NE interface relations involved in the QoS feature.

Figure 5-1 External interfaces of the WiMAX

Upon subscription, the QoS profile is configured on the AAA or the gateway. When a subscriberenters the network and the provisioned service flow is established, the QoS profile is deliveredto the BS. The BS is responsible for service flow management and QoS scheduling.

5.3.2 QoS Application Objects and ParametersThis section describes the QoS application objects and parameters.

QoS Application Objectsl Service-flow-oriented QoS

IEEE802.16e defines five types of service flows: UGS, rtPS, ertPS, nrtPS, and BE.Different QoS parameters are defined for different types of service flows. The systemimplements scheduling according to the types of service flows and QoS parameters, thus



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meeting different QoS requirements of the service flows. Table 5-3 lists the typicalapplications that are supported by different service types.

Table 5-3 Typical applications and parameters of QoS

QoSSchedulingService Type

TypicalService

TypicalBandwidth

TypicalDelay

ToleratedJitter

UGS l E1/T1service with afixed bit rate

l VoIP withoutsilencesuppression

50 kbit/s 25 ms N/A

rtPS MPEG videoservice flow

5 kbit/s to 2Mbit/s

N/A 100 ms

ertPS VoIP withsilencesuppression

32 kbit/s to 64kbit/s

160 ms 5 ms

nrtPS High-bandwidthFTP serviceflow

10 kbit/s to 2Mbit/s

N/A N/A

BE Internet webbrowsing

2 Mbit/s N/A N/A

l Subscriber-oriented QoS

Different subscriber priorities are defined to provide differential services for subscribers.The subscriber priorities are as follows: gold, silver, bronze, and common.

QoS ParametersIn a WiMAX system, QoS parameters are defined to describe the rules for scheduling serviceflows on the air interface. Each type of scheduling service corresponds to a set of QoS parameters,such as the delay, tolerated jitter, and bandwidth. Each type of service has its corresponding QoSparameter set.

UGS

The UGS supports real-time uplink service flows that transmit fixed-size packets on a periodicbasis.

The BS assigns a fixed bandwidth to the service flows with the service data on a real-time andperiodic basis. In this way, the overheads used for requests from the MSs are reduced, and thereal-time requirements of the service flows are met. Therefore, in a UGS service flow, data issent at the bandwidth periodically granted by the BS, and the MS does not request a bandwidthfrom the BS.

The QoS parameters of the UGS are as follows:

l Maximum Sustained Traffic Rate (maximum sustaining rate)

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This parameter indicates the average peak rate of data service flows. The average uplinkrate of the service flows of an MS cannot exceed the value of this parameter. The BS limitsthe downlink rate at the network entry. The value range of this parameter depends on thetransmission capabilities of the air interface and R6 interface and is related to the uplinkand downlink transmission capabilities of the MS. If the value of this parameter isexcessively high or low, the resource management algorithm is implemented to determinewhether the service flow can be successfully established. The higher value the parameterhas, the more resources are to be occupied. When total resources are insufficient, onlinesubscribers decrease. If the value of the parameter is excessively low, the services areaffected. Based on the current capabilities of the MS and the actual service requirements,the recommended value range of this parameter is from 256 kbit/s to 8 Mbit/s. Generally,operators can provide services at different rates, such as 512 kbit/s, 1 Mbit/s, and 2 Mbit/s.

l Request/Transmission Policy (transmission policy)This parameter is used to configure the attributes of service flows. In the latest IEEE 802.16eR2D7, this parameter can indicate the following policies:– Whether to support the broadcast of bandwidth requests (whether requests for uplink

bandwidth use the opportunities broadcast by the BS)– Whether to support multicast bandwidth requests (whether requests for uplink

bandwidth use the opportunities multicast by the BS)– Whether to support piggyback bandwidth requests (whether to use a tag in the protocol

data header of the uplink services to request bandwidth for the MS; if piggybackbandwidth requests are supported, the uplink resource efficiency is improved)

– Whether to support segmentation (whether to divide service data units (SDUs) thatexceed the available resource length into multiple schedulable SDUs during scheduling;if segmentation is supported, oversized SDUs can be scheduled quickly)

– Whether to support PHS (whether to support load header compression; if load headercompression is supported, bandwidth is saved because only one load header istransmitted when the same load and SDUs are transmitted)

– Whether to support packing (whether to merge multiple small SDUs into a large protocoldata unit (PDU); if packing is supported, the number of protocol data headers to betransmitted is reduced, and bandwidth is saved)

– Whether to support CRC (whether to perform CRC during the transmission of data; ifCRC is supported, the check results are appended to the PDUs)

– Whether to support ROHC (ROHC is an efficient method of compressing RTP/UDP/IP headers)

In the current versions of Huawei WiMAX base station and ASN-GW, this parameter canindicate the following policies:– Whether to support the broadcast of bandwidth requests

– Whether to support piggyback bandwidth requests

– Whether to support segmentation

– Whether to support PHS

– Whether to support packing

– Whether to support CRC

l Maximum Latency (maximum delay time)This parameter indicates the maximum interval between the reception of a packet at the BSor MS and the transmission of the packet through the RF part. The lower value the parameter



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has, the more resources are to be occupied. When total resources are insufficient, otherservices may be affected. If the value of the parameter is excessively high, the customersatisfaction is affected.

l Tolerated Jitter (maximum tolerated variation time)

This parameter indicates the maximum change in the delay. Generally, signals are notsimply transmitted on communication channels from the transmitter to the receiver in apoint-to-point manner. Instead, signals may be amplified or forwarded by repeaters. Thereis a process of storing, processing, and forwarding. In addition, the network conditionsaffect the transmission of signals. Therefore, the delay in the same service flow varies. TheTolerated Jitter parameter indicates the maximum change in the delay that can betolerated. The parameter is configured according to the actual services. The lower valuethe parameter has, the more resources are to be occupied. When total resources areinsufficient, other services may be affected. If the value of the parameter is excessivelyhigh, the customer satisfaction is affected.

l SDUFLG (SDU flag)

The value of this parameter may be fixed or variable. If the value of this parameter is setto fixed, the size of the SDU needs to be set. Generally, IP traffic is carried, and the sizesof IP packets vary. Therefore, the value of this parameter is set to variable.

l SDU Size (SDU size)

If the value of the parameter is excessively high, the BS cannot process data properly orthe MS cannot support the value. If the value of the parameter is excessively low, datatransmission may be affected. The parameter is set on the BS according to the actualconditions. The default value is recommended.

When the value of the SDU flag parameter is set to fixed, this parameter must be set. Thesize of the SDU cannot exceed 254 bytes.

l Unsolicited Grant Interval (Unsolicited Grant Interval)

This parameter indicates the grant interval for a service flow that does not request any grant.It is a 16-bit unsigned integer. The value range is 0 to 65535 (in milliseconds). If theparameter is set to a high value, the continuity of real-time services is affected. If theparameter is set to a low value, the bandwidth is wasted.

rtPS

The real-time polling service (rtPS) supports real-time uplink service flows that transmitvariable-size packets on a periodic basis, for example, the MPEG video service flow.

In the rtPS, the BS offers real-time, periodic, and unicast request opportunities, which enablethe service flow to inform the BS of its variable requirements for bandwidth on a periodic basis.In this manner, the BS can grant variable burst bandwidth on a periodic basis for the serviceflow to transmit variable-size packets. The rtPS requires more request overheads than the UGSbut supports variable grant sizes for the optimum data transmission efficiency.

The QoS parameters of the rtPS are as follows:

l Minimum Reserved Traffic Rate (minimum guaranteed rate)

This parameter indicates the minimum data rate reserved by the service flow. The BS offersthe bandwidth required by the minimum data rate reserved by the service flow. If thebandwidth required by the service flow is less than the reserved bandwidth, the BS can usethe remaining part of the reserved bandwidth for other purposes. The higher value theparameter has, the more resources are occupied. When total resources are insufficient,

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online subscribers decrease. If the value of the parameter is excessively low, the servicesare affected.

l Request/Transmission Policy (transmission policy)

l Maximum Latency (maximum delay time)

l SDUFLG (SDU flag)


l Maximum Traffic Burst (Maximum burst length)

Burst transmission is a type of intermittent data transmission mode. In burst transmission,data generated at a low rate is buffered by the transmitter. When the buffered data is enoughto form a data group, the data is transmitted at a rate dozens of times faster than the rate atwhich the data is generated. The receiver buffers the received data and forwards the datato subscribers at normal rates. The maximum burst length is determined by the bufferingcapabilities and maximum sustained service rate. Within a proper range, an increase in thebuffers raises the transmission rate.

l Traffic Priority (optional) (Flow Priority)

This parameter indicates the priority of the same service flow. For two service flowsidentical in all QoS parameters except the priority, the service flow with a higher priorityhas a lower delay and a higher buffering priority. For service flows with different QoSparameters, the priorities are not determined by the priority parameter when the priorityparameter conflicts with the QoS parameters.

ertPS

The extended real-time polling service (ertPS) is designed to support real-time service flowsthat generate variable-size packets on a periodic basis, such as VoIP with silence suppression.

The ertPS is a scheduling mechanism that builds on the efficiency of both the UGS and the rtPS.The BS offers unicast grants in an unsolicited manner like in UGS, thus reducing the delay ofrequests for bandwidth. UGS allocations are fixed in size, whereas ertPS allocations are dynamic.The BS can provide periodic uplink bandwidth allocations that can be used for requestingbandwidth and data transmission. By default, the sizes of allocations correspond to the currentvalue of the parameter Maximum Sustained Traffic Rate of the service flow. The MS may requesta change in the size of the uplink allocation by using the Extended Piggyback Request field ofthe grant management subheaders or the BR field of the MAC signaling headers, or by sendinga codeword over the channel quality indicator channel (CQICH). The BS does not change thesize of uplink allocations until it receives another request for bandwidth change from the MS.

The QoS parameters of the ertPS are as follows:


l Minimum Reserved Traffic Rate (minimum guaranteed rate)

This parameter indicates the minimum data rate reserved by the service flow. The BS offersthe bandwidth required by the minimum data rate reserved by the service flow. In the ertPS,the reserved traffic rate is generally set to the same value as the maximum sustained trafficrate. On the downlink, bandwidth is allocated according to the data amount but cannotexceed the maximum sustained traffic rate. On the uplink, the maximum sustained trafficrate is always allocated. If the remaining bandwidth of the BS is below the maximumsustained traffic rate when a service flow is established, the service flow cannot besuccessfully established.




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l Maximum Latency (maximum delay time)

l Tolerated Jitter (maximum tolerated variation time)

l SDUFLG (SDU flag)




l Unsolicited Grant Interval (Unsolicited Grant Interval)

nrtPS

The non-real-time polling service (nrtPS) is designed to support non-real-time uplink serviceflows that transmit variable-size packets on a non-periodic basis, such as high-bandwidth FTPservice flows.

The BS offers unicast polls on a regular basis, which ensures that the service flow receivesrequest opportunities even during network congestion. The service flow can also send requestsfor bandwidth in a competitive manner.

The QoS parameters of the nrtPS are as follows:

l Minimum Reserved Traffic Rate (minimum guaranteed rate)If the bandwidth required by the service flow is less than the reserved bandwidth, the BScan use the remaining part of the reserved bandwidth for other purposes.



l SDUFLG (SDU flag)




BE

The best-effort (BE) service is designed to offer best-effort transmission and has the lowestpriority.

A BE service flow can use transmission opportunities offered by unicast polls or send bandwidthrequests in a competitive manner. The probability of the BE service flow using opportunitiesoffered by unicast polls depends on the load on the network. If the load on the network is light,the BE service flow may probably have transmission opportunities. If the load on the networkis heavy, the probability of transmission opportunities is slim or even none. Therefore, whentransmitting BE service flows, the MS cannot rely on transmission opportunities offered byunicast polls. The network does not guarantee the QoS for BE service flows.

The QoS parameters of the BE service are as follows:



l SDUFLG (SDU flag)



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BE starvation prevention

In actual situations, the BE service may be starved.

To prevent the BE service from starvation, the algorithm switch and the rate of reserved resourcesare configured. This prevention method is applicable to the BE service instead of a specific BEservice flow. That is, the setting of the resource reservation rate for the BE service is based onthe total number of resources.

The following table lists the parameters related to BE starvation prevention.

Table 5-4 Parameters related to BE starvation prevention

Parameter Description Default Value Remarks

AntiBEStavSwicher BE starvationprevention switch

OFF This is a carrier-levelparameter. It can bemodified only afterthe carrier isdeactivated.

LBE_UL Rate of uplink loadreserved for the BEservice

5% This is a carrier-levelparameter. It can bemodified only afterthe carrier isdeactivated.

LBE_DL Rate of downlinkload reserved for theBE service

15% This is a carrier-levelparameter. It can bemodified only afterthe carrier isdeactivated.

5.3.3 QoS Transmission ControlThis section describes the QoS transmission control mechanism.

The QoS transmission control mechanism defines the mapping relation between the transmissionbearer priorities and the WiMAX R6 interface transmission resource configuration and traffic.It addresses many problems, for example, how to guarantee the service QoS, bandwidth utilityrate, and user fairness in the scenarios such as fixed transmission bandwidth, dynamicallychanging bandwidth, branching transmission, and load balance. The QoS transmission controlinvolves the transmission differentiated service, transmission admission control, andtransmission overload control.

Differentiated Transmission Service

In the differentiated transmission service, different priorities are assigned to the user data,including five types of scheduling service data, signaling data, and maintenance data. Thisenables different transmission priorities. Under the circumstance of network congestion, thetraffic with higher priority will take precedence in transmission.



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Differentiated transmission services use two types of rules. One is based on the priority indicatorin TOS field of the IP header; the other is the DSCP value in TOS. Currently, only the latter ruleis supported.

Transmission Admission Control

Transmission admission control: Uplink and downlink admission control is implementedaccording to the admission thresholds of different types and levels of services. High-priorityservices (such as the UGS) of high-priority users (such as handover users) are admitted on apreferential basis. The number of admitted users is limited with the aim of guaranteeing thequality of ongoing services.

Transmission Overload Control

In the case of system overload, the transmission overload control mechanism enables the systemto remove low-priority service connections according to the transmission overload threshold andclearance threshold. When the system load becomes normal, the system congestion isautomatically and quickly cleared.

5.4 Operations Related to QoSThis section describes how to activate and deactivate the QoS feature.

5.4.1 Activating the QoS FeatureIf authentication is carried out, you need to activate the QoS feature over the R1 interface throughthe graphic user interface (GUI) of the Web Management Access System (WMAS) on the AAA.For details, see the documentation delivered with the AAA. If authentication is not carried out,you need to run relevant commands on the gateway to activate the QoS feature over the R1interface. For details, see the documentation delivered with the gateway. You need to run MMLcommands on the M2000 or the LMT of the WiMAX BS to activate the QoS feature over theR6 interface.

5.4.2 Deactivating the QoS FeatureThe QoS is a mandatory feature. Deactivating this feature renders all the WiMAX SSs on thenetwork unable to transmit any service data. You are advised not to deactivate this feature.

5.4.1 Activating the QoS FeatureIf authentication is carried out, you need to activate the QoS feature over the R1 interface throughthe graphic user interface (GUI) of the Web Management Access System (WMAS) on the AAA.For details, see the documentation delivered with the AAA. If authentication is not carried out,you need to run relevant commands on the gateway to activate the QoS feature over the R1interface. For details, see the documentation delivered with the gateway. You need to run MMLcommands on the M2000 or the LMT of the WiMAX BS to activate the QoS feature over theR6 interface.

Procedurel Run the relevant commands on the AAA or the gateway to activate the QoS feature over

the R1 interface. Assume that the commands are run on the gateway.

Data Collection

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– QoS template of a service flow– Template index: 1

– Direction (upward or downward): UPWARD

– Media stream type: VOD

– Scheduling type: UGS

– Transmission policy:NOBCREQ-0&NOPIGGYBACK-0&NODEFRAG-0&NOSUPPRESS-0&NOPACK-0&NOCRC-0 (No transmission policy is adopted.)

– SDU flag: Variable

– Maximum sustained traffic rate: 1,171,200 bit/s

– Minimum sustained traffic rate: 1,171,200 bit/s

– Tolerated jitter: 50 ms

– Maximum latency: 5 ms

– Template index: 2

– Direction (upward or downward): DOWNWARD

– Downlink paging flag: ENABLE (Paging is enabled.)

– Media stream type: VOD

– Scheduling type: UGS

– Transmission policy:NOBCREQ-0&NOPIGGYBACK-0&NODEFRAG-0&NOSUPPRESS-0&NOPACK-0&NOCRC-0 (No transmission policy is adopted.)

– SDU flag: Variable

– Maximum sustained traffic rate: 1,171,200 bit/s

– Minimum sustained traffic rate: 1,171,200 bit/s

– Tolerated jitter: 50 ms

– Maximum latency: 5 ms

– Parameters of the classifier– Classifier index: 1

– Protocol type: TCP

– Mask of the destination IP address: 255.255.255.0

– Destination IP address: 10.1.1.1

– Mask of the source IP address: 255.255.255.0

– Source IP address: 10.2.2.2

– Lower threshold of the IP service type/DSCP: 0

– Upper threshold of the IP service type/DSCP: 240

– Mask of the IP service type/DSCP: 255

– Classifier index: 2

– Protocol type: TCP

– Mask of the destination IP address: 255.255.255.0

– Destination IP address: 10.10.10.1



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– Mask of the source IP address: 255.255.255.0

– Source IP address: 10.20.20.2

– Lower threshold of the IP service type/DSCP: 0

– Upper threshold of the IP service type/DSCP: 240

– Mask of the IP service type/DSCP: 255

– Template of a service flow– Class number of the service flow: 1, 2

– Direction (upward or downward): UPWARD, DOWNWARD

– Classifier priority: priority 1 for the classifier with index 1; priority 2 for the classifierwith index 2

– QoS template index: 1

– QoS priority: 6 (Value range: 0 to 7. A greater number indicates a higher priority ofthe service flow.)

l Configure four subscriber levels on AAA: gold, silver, bronze, and common. For detailson configuration methods, see the documentation delivered with the AAA. By default, allsubscribers are configured as common subscribers.

l According to various operation policies, on the M2000 or the LMT of the WiMAX BS, runthe MOD QOSFACTOR command to configure the priority weight factor for each gold,silver, bronze, and common subscriber.By default, the priority weight factors for gold, silver, bronze, and common subscribers are4, 3, 2, and 1 respectively.

l Run MML commands on the M2000 or the LMT of the WiMAX BS to activate the QoSfeature over the R6 interface.When activating the QoS feature over the R6 interface, you need to configure the logicalinterface for transmission, the IP path, and the priorities of differential services. In addition,the transmission differentiated service, transmission admission control function, andtransmission overload control function can be configured to meet requirements of thecustomer.1. Run the ADD LGCPORT command to configure the logical interface.

Example:ADD LGCPORT: CN=0, SRN=0, SN=7, LPN=6, SSN=0, PT=ETH, PN=1, TXBW=150000, RXBW=150000, TXCBS=200000, TXEBS=200000, TXSSW=OFF, RTMP=6, TXRTFC=26, RXRTFC=24;

2. Run the ADD IPPATH command to configure the QoS parameters of the IP PATHand logical interface (R6 interface).Example:ADD IPPATH: PATHID=128, CN=0, SRN=0, SN=6, LPN=0, LOCALIP="172.16.12.251", PEERIP="192.168.1.155", PATHTYPE=ANY, PATHCHK=ENABLED;

NOTE

The IP path is configured for a specific logical interface, the IP address of the BS is the interface IPaddress, and the IP address of the gateway is the physical or logical IP address of the gateway.

3. Run the SET DIFPRI command to configure the priorities of differentiated services.

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NOTE

l Configuring the priorities of differentiated services refers to specifying the DSCP priorities ofservices. If this step is not performed, the system uses the default DSCP priorities for services.

l The configuration of differentiated services takes effect after the BS is restarted.

For example, to configure the priorities of differentiated services (priority rule: DSCP,signaling priority: 48, VLAN priority for signaling: 6, OAM priority:32, OAMVLANpriority: 3, OAM FTP priority: 1, OAM FTP VLAN priority: 0), run the followingcommand:

SET DIFPRI: PRIRULE=DSCP, SIGPRI=48, SIGVLANPRI=6, OAMPRI=32, OAMVLANPRI=4, OAMFTPPRI=1, OAMFTPVLANPRI=0, DT1PRI=46, DT1VLANPRI =6, DT2PRI=34, DT2VLANPRI=4, DT3PRI=46, DT3VLANPRI=6, DT4PRI=10, DT4VLANPRI=1, DT5PRI=18, DT5VLANPRI=2, DT6PRI=26, DT6VLANPRI=3, DT7PRI=0, DT7VLANPRI=0;

4. Run the SET TACALG command to configure transmission admission control.

For example, you need to configure transmission admission control. The uplink anddownlink admission thresholds of high-priority subscribers (handover subscribers)are 85%, and those of new subscribers are 75%. That is, when the system load is lessthan 75%, all subscribers can access the network; when the system load is between75% and 85%, only high-priority subscribers can access the network; when the systemload is greater than 85%, no subscriber can access the network. When the value ofUSERDATATYPE5GBR is set to 100, the current bandwidth is reserved for non-real-time services such as BE services.

SET TACALG: TRMULCACSWITCH=ON, TRMDLCACSWITCH=ON, TRMULVIPUSERCACTH=85, TRMULUSERCACTH=85, TRMDLVIPUSERCACTH=75, TRMDLUSERCACTH=75, USERDATATYPE5GBR=100, USERDATATYPE1ACTFACTOR=100, USERDATATYPE2ACTFACTOR=100, USERDATATYPE3ACTFACTOR=100, USERDATATYPE4ACTFACTOR=100, USERDATATYPE5ACTFACTOR=100;

5. Run the SET TOLCALG command to configure transmission overload control.

For example, to configure the overload control switch (uplink overload control switch:disabled, downlink overload control switch: enabled, threshold for triggering uplinkoverload control: 100%, threshold for releasing uplink overload control: 0%, latencyof triggering overload control: 0 ms, overload control period: 100s, and number ofservice flows periodically released after overload: 0), run the following command:

SET TOLCALG: TRMULOLCSWITCH=OFF, TRMDLOLCSWITCH=ON, TRMULOLCTRIGTH=100, TRMULOLCRELTH=0, TRMDLOLCTRIGTH=100, TRMDLOLCRELTH=0, TRMOLCTIMETRG=0, TRMOLCACTIONPRD=100, TRMOLCRELBEARERNUM=0;

----End

Verifying the QoS FeatureYou need to enter the network with a WiMAX MS/SS, and check whether service flows can beestablished. If service flows can be established, the QoS feature is successfully activated. Ifservice flows cannot be established, the QoS feature fails to be activated.

5.4.2 Deactivating the QoS FeatureThe QoS is a mandatory feature. Deactivating this feature renders all the WiMAX SSs on thenetwork unable to transmit any service data. You are advised not to deactivate this feature.



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5.5 Maintenance Information of QoSThis section describes the parameters and performance counters related to the QoS feature.

Parameters

For the parameters related to the QoS feature, see the documents of the WASN9770.

Performance CountersFor the performance counters related to the QoS feature, see Times of Deregistration due toCarrier Caused by BS Device Fault.

5.6 Reference Information of QoSThe protocols that the QoS feature complies with are IEEE 802.16-2004/Cor2/D3 with latestSRD and WiMAX Forum Network Architecture Release 1.2.0.

5 QoSDBS3900 WiMAX



Issue 03 (2010-03-19)

dbs3900 wimax feature configuration guide (qos)

Documents

minimum guaranteed rate

destination ip address

source ip address

maximum burst length

maximum sustaining rate

unsolicited grant interval

performance counters related

qos application objects