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As was discussed in an earlier section, one of the QoS parameters of a service flow is Service Flow Schedule Type Four types of scheduling services are defined by the standard and dictate how the services are scheduled:
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Unsolicited Grant Service (UGS) This is equivalent to CBR in ATM and is intended for applications that have real-time data streams consisting of fixed-size data packets generated at periodic intervals Examples include T1/E1 services For this type of service, BS grants fixed-size bandwidths periodically to SSs associated with the service flows without being solicited for the bandwidth by the SSs The size of the bandwidth grants at periodic intervals is sufficient to transport the fixed-size data needed by the service flow Real-time Polling Service (rtPS) rtPS is designed for real-time traffic with variable size packets generated at periodic intervals Examples of such traffic are MPEG video stream, VoIP with silence compression, and so on For this type of service, SSs are given opportunities to specify their bandwidth needs by means of periodic unicast polling If the bandwidth requests are within the realm of what can be granted, the bandwidth is granted to the SS Non-real-time Polling Service (nrtPS) nrtPS is designed to support delaytolerant data traffic for which a minimum data rate is required Examples of such traffic include various forms for Internet data transfer protocols In order for SSs to provide this type of service, the BS provides bandwidth request opportunities to the SS by means of unicast polling on a regular basis at an interval comparable to 1 sec Additionally, contention-based broadcast/multicast polling may be used by the SS to request bandwidth allocations dynamically as needs arise Best-effort Service (BE) BE, as the name suggests, is designed to transport data traffic on a best-effort basis with no minimum service level specified In order to provide this type of service, SSs use broadcast/multicast polling mechanisms to request necessary bandwidth SSs providing this kind of services may also be given transmission opportunities to request bandwidth using unicast polling
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Being able to provide multicast services so that bandwidth is not wasted on transmitting identical packets to each and every recipient, is very important for wireless networks as they have limited transmission resources Such networks are routinely expected to use multicast services for applications such as video surveillance, TV broadcast, online games, or point-to-multipoint virtual LAN services Shared medium networks such as PMP RF-wireless networks also provide an ideal ground for providing multicasting services, and WiMAX is no exception WiMAX supports multicast connections that can be used for multicast services on the downlink (transmission from BS to SS) The BS does so by associating a connection (and a CID) with the multicast service and associating all the SSs in the multicast group with the connection The CID used for the multicast service is the same for all the SSs in the same channel that are in the multicast group The standard does not
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specify a separate group of CIDs for multicast services, and the CIDs do not need to be distinguished in any way from the CID used for unicast traffic In fact, each SS does not need to be aware of the fact that it is receiving multicast traffic in the connection The BS broadcasts the multicast data, with the multicast CID, and is received by all the SSs sharing the same channel However, only those associated with the CID would accept it The WiMAX standard allows for per-service encryption techniques (to be discussed in the next section) which enable effective encryption of multicast services such that SSs that are not in the multicast group are not able to decrypt the multicast packet even if they are able to receive it
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