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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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QoS Configuration Case of ATM Services

QoS Configuration Case of ATM Services

Configure an ATM policy and use the ATM policy for a specified ATM service. In this way, the QoS for the ATM service is ensured. In addition, the tunnel QoS can be configured to control the tunnel bandwidth of service flow.

Case Description

This section describes the networking and data planning of this case.

As shown in Figure 3-66, the OptiX OSN access equipment has IMA connections to two NodeBs through E1 ports, and receives ATM services from these NodeBs. The OptiX OSN access equipment first encapsulates the incoming ATM services into PWE3 packets, and transports the packets to the opposite OptiX OSN convergence equipment over a PSN. When receiving the packets, the opposite OptiX OSN convergence equipment decapsulates the packets, and transports the ATM services to the RNC through STM-1 optical interfaces.

Each NodeB transports services such as real-time voice services, signals, and data services. To ensure QoS for different service types, the OptiX OSN equipment specifies different ATM policies for different service types, and uses different PWs to carry these services of various types.

Figure 3-66  Networking diagram for the QoS configuration of ATM services

Figure 3-66 lists the service types of IMA traffic and QoS requirements.

Table 3-279  Service types and QoS requirements
Application Scenario ATM Policy PW Bandwidth Tunnel Bandwidth
Voice service, which is carried by the RT-VBR type.
  • Policy ID: 1
  • Policy name: RT-VBR
  • Service type: RT-VBR
  • Traffic type: ClpNoTaggingScrCdvt
  • Clp01Pcr(cell/s): 4000
  • Clp0Scr(cell/s): 1000
  • MBS(cell): 100
  • CDVT(us): 10000
  • Enable Traffic Frame Discarding Flag: Disable
  • UPC/NPC: Disable
Bandwidth: 4 Mbit/s 30 Mbit/s
Signaling service, which is carried by the CBR type.
  • Policy ID: 2
  • Policy name: CBR
  • Service type: CBR
  • Traffic type: NoClpNoScr
  • Clp01Pcr(cell/s): 800
  • Enable Traffic Frame Discarding Flag: Disable
  • UPC/NPC: Disable
Bandwidth: 1 Mbit/s 30 Mbit/s
Data service, which is carried by the UBR type.
  • Policy ID: 3
  • Policy name: UBR
  • Service type: UBR
  • Traffic type: NoTrafficDescriptor
  • Enable Traffic Frame Discarding Flag: Disable
  • UPC/NPC: Disabled
Bandwidth: 15 Mbit/s 30 Mbit/s

Configuration Process

This section describes the configuration process for this example. The configuration steps include ATM policy configuration and application.

Prerequisites

  • You are an NM user with Operator Group rights or higher.
  • Be aware of the networking and data planning of the example.

Procedure

  1. Configure the RT-VBR policy.
    1. In the NE Explorer, select NE1 and choose Configuration > Packet Configuration > QoS Management > Policy Management > ATM Policy.
    2. Click New, and set the parameters in the Create ATM Policy dialog box. Click OK.

      Set the parameters for the RT-VBR policy as follows:

      • Policy ID: 1
      • Policy name: RT-VBR
      • Service type: RT-VBR (Select the service type based on the type of incoming service. Specifically, the voice service corresponds to RT-VBR, which is of the highest service priority.)
      • Traffic type: ClpNoTaggingScrCdvt (This parameter indicates that the two-level bucket is valid. At one level, CLP01 is processed based on Clp01Pcr, and improper cells are discarded. At the other level, CLP0 is processed based on Clp0Scr, and improper cells are discarded.)
      • Clp01Pcr(cell/s): 4000 (This parameter indicates the maximum permitted rate at which cells are transmitted. Set the parameter based on the service rate.)
      • Clp0Scr(cell/s): 1000 (This parameter indicates the sustainable cell rate at which cells are transmitted. Set the parameter based on the service rate.)
      • MBS(cell): 100 (This parameter indicates the maximum number of burst cells tolerated by the equipment after the traffic exceeds Clp01Pcr.)
      • CDVT(us): 10000 (This parameter indicates the capability of tolerating burst ATM cells. When a cell arrives later than it is expected, the cell bursts. The burst volume is measured by the time difference between the actual arrival time and expected arrival time. If the burst volume of multiple consecutive cells exceeds the CDVT, the equipment discards the improper cells. Set the parameter to a large value, when possible, to minimize the number of lost packets.)
      • Enable Traffic Frame Discarding: Disabled (The service encapsulated in AAL5 is sliced into cells. This parameter specifies whether to discard cells or to discard the complete AAL5 frames for the cells.)
      • UPC/NPC: Enable (UPC and NPC stand for user parameter control and network parameter control respectively. The bucket algorithm is based on the content of UPC/NPC. UPC/NPC is intended to monitor the cells received by the equipment based on the specified traffic parameters, and therefore to avoid network congestion. The Scr, Pcr, MBS, and CDVT bucket parameters are functional only when UPC/NPC is enabled for the ATM policy.)

    3. Click OK.
  2. Configure the CBR policy.
    1. In the NE Explorer, select NE1 and choose Configuration > Packet Configuration > QoS Management > Policy Management > ATM Policy in the Function Tree.
    2. Click New, set the parameters in the Create ATM Policy dialog box. Click OK.

      Set the parameters for the CBR policy as follows:

      • Policy ID: 2
      • Policy name: CBR
      • Service type: CBR (Select the service type based on the type of incoming service. Specifically, the signal service corresponds to the CBR service, which is of the highest service priority.)
      • Traffic Type: NoClpNoScr (The bucket at the first level takes effect, processes the cells with the Clp01 flags based on Clp01Pcr, and discards the cells without the Clp01 flags.)
      • Clp01Pcr(cell/s): 800
      • Enable Traffic Frame Discarding: Disabled
      • UPC/NPC: Enable

    3. Click OK.
  3. Configure the UBR policy.
    1. In the NE Explorer, select NE1 and choose Configuration > Packet Configuration > QoS Management > Policy Management > ATM Policy in the Function Tree.
    2. Click New, and set the parameters in the Create ATM Policy dialog box. Click OK.

      Set the parameters for the UBR policy as follows:

      • Policy ID: 3
      • Policy name: UBR (Select the service type based on the type of incoming service. Specifically, the data service corresponds to the UBR service, which is of the lowest service priority.)
      • Service type: UBR (No QoS is ensured for the accessed service. In the case of network congestion, the UBR cells are discarded at the earliest.)
      • Traffic type: UBR (No QoS is ensured for the accessed service. In the case of network congestion, the UBR cells are discarded at the earliest.)
      • Enable Traffic Frame Discarding: Disabled
      • UPC/NPC: Disabled

    3. Click OK.
  4. Configure the ATM service.

    When creating an ATM service, do as follows.

    • Configure the ATM connection.
      • Specify the uplink and downlink ATM policy, that is, Policy 1(RT-VBR), for the ATM connections that carry the voice services.
      • Specify the uplink and downlink ATM policy, that is, Policy 2(CBR), for the ATM connections that carry the signal services.
      • Specify the uplink and downlink ATM policy, that is, Policy 3(UBR), for the ATM connections that carry the data services.
    • Configure the PW.

      Specify the bandwidth for the PW in the QoS tab.

      • The bandwidth of PW 1 (corresponding to RT-VBR service type) is 4 Mbit/s.
      • The bandwidth of PW 2 (corresponding to CBR service type) is 1 Mbit/s.
      • The bandwidth of PW 3 (corresponding to UBR service type) is 15 Mbit/s.
    • Configure the ATM CoS mapping relation.

      Specify the ATM CoS mapping the ATM service. The mapping ID is 1 and the mapping name is DefaultAtmCosMap.

      NOTE:

      DefaultAtmCosMap is the default ATM CoS mapping table of the equipment and cannot be deleted. In this example, the default CoS mapping table is used. The user can also create an ATM CoS mapping table as required. For details on how to create an ATM CoS mapping table, see Configuring ATM CoS Mapping.

    NOTE:

    For the ATM service configuration method, see Configuration Example of the UNI-NNI ATM Service.

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Updated: 2019-01-21

Document ID: EDOC1100020976

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