aging (data/voice/media); or downlink); asymmetric; delay web browsing; audio on demand; tolerant internet radio; access to databases; video download/upload; peer-to-peer file sharing; video streaming 6.5 Quality of service 4. Utilization of QoS traffic parameters for DL service flows; 5. Grouping of service flow properties into service classes; therefore, upper-layer entities and external applications at both the MS and BS may request service flows with desired QoS parameters in a globally consistent way. The principal mechanism for providing QoS is to associate packets transported through the MAC interface that are identified by a transport CID to a service flow. A service flow is a uni-directional flow of packets linked to a particular QoS parameter set. In other words, a service flow is a MAC transport service that provides uni-directional transport of packets either to UL packets transmitted by the MS or to DL packets transmitted by the BS. A service flow is characterized by a set of QoS parameters such as latency, jitter, and throughput requirements. The MS and BS provide the QoS according to the QoS parameter set defined for the service flow. Service flows exist in both UL and DL directions. All service flows are identified with a 32-bit Service Flow Identifier (SFID). In addition, each admitted or active service flow has a 16-bit CID. A service flow is partially characterized by the following attributes [1]: Service Flow ID: an SFID is assigned to each existing service flow. The SFID serves as the identifier for the service flow associated with an MS. A service flow has an SFID and an associated direction as a minimum. CID: the connection identifier of the transport connection exists only when the service flow is admitted or active. The relationship between SFID and transport CID, when present, is unique. An SFID is never associated with more than one transport CID, and a transport CID is never associated with more than one SFID. ProvisionedQoSParamSet: a QoS parameter set provisioned via mechanisms outsi