February 2004
Intermediate to advanced
312 pages
8h 49m
English
Content preview from First Mile Access Networks and Enabling Technologies
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Scheduling Services
Scheduling services improve efficiency of the system. A BS can predict the throughput and latency needs by specifying scheduling services and QoS parameters associated. The scheduling services in WirelessMAN (802.16) reuse the services defined by cable modem DOCSIS standards. Table 5-3 summarizes the services. Each of these services is fine-tuned for specific data flow.
| Scheduling Type | Piggyback Request | Bandwidth Stealing | Polling |
|---|---|---|---|
| Unsolicited Grant Service (UGS) | Not allowed | Not allowed | PM bit is used to request a unicast poll for bandwidth needs of non-UGS connections. |
| Real-time Polling Service (rtPS) | Allowed | Allowed for GPSS | Scheduling only allows unicast polling. |
| Non-Real-Time Polling Service (nrtPS) | Allowed | Allowed ... |
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