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    Configuring a CoS Policy Profile for 3G and 4G Networks

    In a 3G network, the class-of-service (CoS) policy profile defines the highest traffic class that can be accepted at an access point name (APN) or system level, the MBR and GBR for bearers, and the allocation and retention priority(ARP). By default, when a PDP context request has a higher MBR or GBR value than the value configured in the CoS policy profile the packet data protocol (PDP) context request is downgraded.

    In a 4G network, a CoS policy profile defines the highest QoS Class Identifier (QCI) value that can be accepted at the APN level or system level, the aggregate maximum bit rate (AMBR) for default bearers, and the allocation and retention priority. A CoS policy also specifies the policer action when subscriber traffic exceeds the configured AMBR. By default, when a bearer request has a higher AMBR value than the value configured in the CoS policy profile, the bearer request is downgraded.

    Before you begin, complete the following tasks:

    • Configure a CoS classifier profile for 3G and 4G networks.
    • Configure CoS bandwidth pools (for 3G networks only).
    • Configure a CoS resource threshold profile for 3G and 4G networks.

    To configure a CoS policy profile for 3G and 4G networks:

    1. Specify a name for the CoS policy profile.
      [edit unified-edge cos-cac]user@host# edit cos-policy-profiles policy-profile-2
    2. Configure the highest QCI that can be accepted at the APN or system level, and specify upgrade to allow bearers with a lower QCI value to be upgraded to a higher QCI value.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set qos-class-identifier 5 upgrade
    3. Configure the highest traffic class and, for the interactive traffic class, the maximum traffic handling priority that can be accepted for a PDP context.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set traffic-class interactive priority 2
    4. Configure the aggregate maximum bit rate for traffic:
      1. Configure the aggregate maximum bit rate for downlink traffic.
        [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 aggregated-maximum-bit-rate]user@host# set downlink 250000
      2. Configure the aggregate maximum bit rate for uplink traffic.
        [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 aggregated-maximum-bit-rate]user@host# set uplink 100000

        Note: When you configure the aggregate maximum bit rate, you can either specify both or uplink and downlink, but you cannot configure both with either the uplink or downlink option. In addition, if you specify the uplink option, you must also specify the downlink option for the traffic class.

      3. Configure the policy profile to either upgrade or reject bearer requests based on the AMBR value specified in the user packet:

        • To upgrade bearer requests that specify a lower AMBR than the configured AMBR:
          [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 aggregated-maximum-bit-rate]user@host# set upgrade
        • To reject new bearer requests that specify a higher AMBR than the configured AMBR.
          [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 aggregated-maximum-bit-rate]user@host# set reject

          Note: When the reject option is configured, the broadband gateway rejects any Create Session requests with higher AMBR value than the configured AMBR. However, Modify bearer requests with a higher AMBR value are downgraded to the configured AMBR.

    5. Specify that only bearer requests with a higher allocation and retention priority (PL) value than the configured value are accepted when thresholds are exceeded at the APN level or system level, and allow the PL value of a lower-priority bearer request to be upgraded.
      [edit unified-edge cos-cac cos-policy-profilespolicy-profile-2 allocation-retention-priority]user@host# set gtpv2-priority-value 7 upgrade
    6. Specify that only PDP context requests with a higher-priority ARP value than the configured ARP value are accepted when thresholds are exceeded at the APN level or system level, and allow the ARP value of a lower-priority bearer request to be upgraded.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 allocation-retention-priority]user@host# set gtpv1-priority-value 3 upgrade
    7. Configure an MBR for each traffic class.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 maximum-bit-rate traffic-class]user@host# set streaming uplink 50000 user@host# set streaming downlink 200000 user@host# set interactive uplink 200000 user@host# set interactive downlink 200000 user@host# set conversational both 250000 user@host# set background both 20000

      Note: When you configure the MBR or GBR for a given traffic class, you can either specify both or uplink and downlink, but you cannot configure a traffic class using both with either the uplink or downlink option. In addition, if you specify the uplink option, you must also specify the downlink option for the traffic class.

    8. Allow PDP context requests that have a lower MBR than the configured MBR to be upgraded.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 maximum-bit-rate traffic-class]user@host# set upgrade
    9. Configure a GBR (in kbps) for streaming and conversational traffic classes. Optionally, you can configure different GBRs for uplink and downlink traffic.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 guaranteed-bit-rate traffic-class]user@host# set streaming uplink 50000 user@host# set streaming downlink 200000 user@host# set conversational uplink 100000 user@host# set conversational downlink 200000
    10. Configure the action to take when the MBR for a traffic class, or the AMBR for default bearers, exceeds the configured value.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set violate-action set-loss-priority-high

      Note: By default, traffic that exceeds the peak rate is dropped.

    11. Configure the action to take when the GBR for a traffic class of subscriber traffic exceeds the configured GBR.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set exceed-action transmit

      Note: By default, traffic that exceeds the peak rate is set to PLP HIGH and transmit.

    Published: 2011-11-17