TABLE OF CONTENTS Quality of service (QoS) is one or more measurement of desired performance and priorities of a communications system. The WiMax system was designed with the ability to apply different QoS levels to downlink and uplink connections and it can provide multiple service types on a single connection to each user. QoS measures for WiMax systems may include service availability, data throughput, delay, jitter, and error rate.
Service availability is the ratio of the amount of time an authorized user is able to access the services compared to the total time service is supposed to be available. Service availability can be affected by a variety of factors including admission control and oversubscription.
Admission control is the process of reviewing the service authorization level associated with users and determining how much network resources will be allocated if the network resources are available. Admission control is used to adjust, limit or assign the use of limited network resources to specific types or individual users. Access control may allow for the assignment of higher access level priority for specific types of users such as public safety users.
Oversubscription is a situation that occurs when a service provider sells more capacity to end customers than a communications network can provide at a specific time period. This provides a benefit of reduced network equipment and operational (reduced leased line) cost.
Oversubscription is a common practice in communications networks as customers do not continuously use the maximum capacity assigned to them and customers access the...
