Class of Service (CoS) Policy Profile Overview

A CoS policy profile manages the following resources and settings:

• Maximum QoS Class Identifier (QCI)—Any bearer set up with a QCI value that is of a higher priority (numerically lower) than the configured maximum QCI value is downgraded by default. A Modify bearer request that specifies a higher-priority QCI than the configured maximum QCI will be downgraded to a maximum QCI value. Optionally, you can configure the broadband gateway to allow bearers with a lower-priority QCI than the configured value to be upgraded or rejected.
• Maximum traffic class—Any bearer set up with a traffic class or traffic handling priority that is of a higher traffic class is downgraded by default. A modify bearer request that is of a higher traffic class than the configured maximum traffic class is downgraded to the maximum traffic class. Optionally, you can configure the broadband gateway to allow bearer requests of a lower traffic class to be upgraded or rejected.
• Aggregate maximum bit rate (AMBR)—In a 4G network, the AMBR specifies the total maximum bit rate for all default bearers associated with a specific gateway or access point name (APN). A bearer request that specifies a higher AMBR than the configured value is downgraded by default. Optionally, you can configure the broadband gateway to allow bearers with a higher AMBR than the configured value to be upgraded or rejected. You can configure different AMBR values for uplink and downlink traffic.
• Maximum bit rate (MBR)—In a 3G network, each traffic class specifies the maximum bit rate allowed. A bearer request that specifies a higher MBR than the configured maximum value is downgraded by default. Optionally, you can configure the broadband gateway to allow bearers with a lower MBR than the configured value to be upgraded or rejected. You can configure different maximum bit rates for uplink and downlink traffic.
• Guaranteed bit rate (GBR)— In a 3G network, the conversational and streaming traffic classes specify the maximum guaranteed bit rate allowed. A bearer request that specifies a higher GBR than the configured maximum value is downgraded by default. Optionally, you can configure the broadband gateway to allow bearers with a lower GBR than the configured value to be upgraded or rejected. You can configure different guaranteed bit rates for uplink and downlink traffic.