Unsolicited grant service.
Among these QoS classes, unsolicited grant service (UGS) has been designed to support real-time service flows that periodically generate fixed-size data packets.
Four scheduling services in the 802.16 standard are supported: unsolicited grant service (UGS), real-time polling service (rtPS), nonreal-time polling service (nrtPS), and best effort (BE).
(5) If node's privilege level is greater than or equal to the required privilege level, then grant service; otherwise, deny service. .
(3) If the required privilege level for the service is less than the minimum privilege level on the certificate, then grant service.
Type II of PSC is recommended for the connection of unsolicited grant service (UGS) and real-time variable rate (RT-VR) services.
The unsolicited grant service (UGS) periodically generates constant-size data packets for real-time traffic such as voice over Internet Protocol (VoIP) without silence suppression.
That is, a secondary type of traffic that has the most stringent QoS requirements (such as the unsolicited grant service class in mobile WiMAX) is considered.
Five service types that are considered in mobile WiMAX systems are unsolicited grant service (UGS), real-time polling service (rtPS), extended rtPS (ertPS), non-real-time polling service (nrtPS), and best effort service (BES) [3].
Packets from upper layer are mapped and categorized into five different service classes: unsolicited grant service (UGS), extended real-time polling service (ertPS), real-time polling service (rtPS), non-real-time polling service (nrtPS), and best effort (BE).
