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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
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802.11 802.11a 802.11b 802.11g 802.11n Adaptive antenna system (AAS) Adaptive Antenna System (AAS) Delay spread Doppler spread Fading in wireless communications Frequency reuse Handoff protocols Intercell and intracell handover ISM bands OFDM Paging system Simplex, half-duplex and full-duplex Types of cellular networks Types of spectrum sharing WiMax service classes
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WiMax service classes
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WiMax supports various types services ranging from high-QoS-guaranteed services to best-effort services. Specifically, these service types include:
Unsolicited grant service (UGS)
This type of service is designed to support real-time service flows that periodically generate fixed-size data packets such as T1/E1 and VoIP without silence suppression. Also, this type of services is generally symmetric in bandwidth and QoS requirements.
Real-time polling service (rtPS)
This type of service is designed to support real-time service flows that periodically generate variable-size data packets, such as MPEG video.
Extended real-time polling service (ertPS)
ertPS is a scheduling mechanism built based on the efficiency of both UGS and rtPS. The BS provides unsolicited unicast grants as in UGS, which saves the latency of a bandwidth request. However, ertPS allocates bandwidth not on the basis of a fixed packet size as in UGS.
Non-real-time polling service (nrtPS)
This type of service offers regular unicast polls from BS to SS so as to ensure that each service flow can receive bandwidth request opportunities even during network congestion.
Best effort (BE)
This type of service is intended to provide efficient service for BE traffic such as web surfing. Generally, a bandwidth contention mechanism is used to request bandwidth from BS for each service flow.
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Added: 03rd November 2006 12:52:38 AM Modified: 03rd November 2006 12:52:38 AM
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