LTE, LTE-Advanced and WiMAX: Towards IMT-Advanced Networks

QoS in IEEE 802.16m

QoS Parameters

The IEEE 802.16m amendment does not define any additional QoS parameters other than the QoS parameters defined in IEEE 802.16-2009.

Classification

The IEEE 802.16m amendment defines a new service flow type called the emergency service flow. These are given priority in admission control over regular service flows. Default service flow parameters are defined for emergency service flow. The ABS grants resources in response to an emergency service notification from the AMS without going through the complete service flow setup procedure. Each PDU crossing an IEEE 802.16m network is associated with a unidirectional flow of packets possessing a specific QoS requirement with a service flow. Each service flow is mapped to one transport connection that is defined by one FID and one STID. The scheduling services (UGS, rtPS, nrtPS, BS and ExrtPS) of the WirelessMAN OFDMA reference system are supported in IEEE 802.16m. The IEEE 802.16m amendment also provides a specific scheduling service to support real time non-periodic applications such as on-line gaming.

Bandwidth Request and Grant

In IEEE 802.16m, BRs are transmitted through either indicators or messages. bandwidth request messages can include information about the status of queued traffic at the AMS such as buffer size and quality of service. IEEE 802.16m also supports modifying QoS parameters for active flows. The AMS and ABS negotiate the supported QoS parameter sets during service flow setup procedure. ...