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It is based on dynamic bandwidth allocation in the CAC and different scheduling algorithm was implemented for the service flows, UGS is scheduled with FIFO, rtPs is scheduled with EDF, nrtPs is scheduled with WFQ and best effort is scheduled RR.
of Subchannels 15 (downlink only) Frame duration 20ms Permutation PUSC (downlink) Packets sizes (UGS) 512 byte Packets sizes for others [2.sup.N] (5[less than or equal to] N [less than or equal to] 10) bytes Latency for UGS 150ms Latency for rtPs 200ms Latency for nrtPs 900ms Latency for BE 10 seconds Path loss model Erceg Transmission frequency 3.45GHz Path loss exponents 4.0 Shadowing component 8.9 BS transmitting power 42 (dBm) BS antenna gain 16 (dBi) Receiver sensitivity -107.1 (dBm) Receiver antenna gain -1.10 (dB)
The UGS, rtPS and nrtPS have specific requirements, for instance, UGS and rtPS have a deadline (jitter), and late packets that miss the deadline will be useless, but these two services can tolerate packet loss.
These utxop are allocated in an rtPS or nrtPS queue, respectively, and ordered using EDF.
9.1.2 Update structure of Scheduling rtPS and nrtPS connections:
We propose a novel priority based scheduling algorithm for rtPS and nrtPS class scheduler.
IEEE 802.16d deals with the data transmission of UGS, rtPS, nrtPS and BE services based on various QoS parameters.
Similarly, the nrtPS service can use variable rates, from 521Kbps to 128Kbps, for data transmission depending on the available bandwidth.
IEEE 802.16 standard has unspecified scheduling algorithm portion for rtPS, nrtPS and BE services.
No Real-time Polling Services (nrtPS): The nrtPS offers unicast polls on a regular basis, which assures that the uplink service flow receives request opportunities even during network congestion.
Different cell capacity partitioning schemes for handling the transmission of UGS, rtPS, extend-rtPS, nrtps, and BE data packets can be defined.
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