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MSDUMAC Service Data Unit
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Parameter Value Carrier frequency 2.4 GHz Transmitter power 1 mW Carrier sense sensitivity -85 dBm Transmission range 176 m Bit rate 250 kbps Traffic type Exponential Packet generation interval 0.25s Run time 1h Maxframeretries 3 (default) MAC payload size (MSDU size) 50 bytes (default) Superframe order (SO) 8 (default) Beacon order (BO) 7 (default) [alpha] 0.5
Since the packet is an input to the MAC layer, it is called a MAC service data unit (MSDU).
The use of RTS/CTS causes an overhead especially when the MAC Service Data Unit (MSDU) size is small and this overhead can affect the performance while transmitting Voice over IP (or other real time traffic) [54],[55].
Reference scheduler uses only mandatory TSPEC components: Mean Data Rate, Nominal MSDU Size, and Maximum Service Interval or Delay Bound.
A TXOP time interval of 0 means it is limited to a single MAC service data unit (MSDU) or MAC management protocol data unit (MMPDU) [2],
* MAC Service Data Unit Aggregation (A-MSDU) The term MSDU refers to the payload that is carried by the 802.11 MAC layer frame.
Simulation parameters Parameter Value DIFS (Data inter frame space) 60 [micro] s SIFS (Short inter frame space) 20 [micro] s PIFS (point inter frame space) 40 [micro] s Slot time 20 [micro] s Propagation delay 1 [micro] s Beacon internal 100ms Delay bound 100ms Priority class 6(VoIP), 5(Video), 0(Data) Mean data rate 64 kbps(VoIP), 375 kbps(Video) Maximum MSDU size 60 bytes(VoIP), 1000 bytes(Video, Data) MAC header 34Bytes Sub-frame header in A-MSDU 14 Bytes PHY Rate 54Mbps ACK, CTS 112 bits + MAC header RTS 160 bits + MAC header Fig.
The maximum achievable capacity of the IEEE 802.11 MAC layer [C.sub.max-802.11] can be obtained by dividing the MAC Service Data Unit (MSDU) length by the total time taken to transmit the MSDU.
Parameter specification in the simulation Parameter Value Symbol interval 0.242 [micro]s MSDU size 4096 octets Aggregated frame 8 Application traffic CBR traffic SIFS, SBIFS, RIFS time 3, 1, 1 [micro]s Slot time 3 [micro]s Guard interval duration 48.4 ns High data rate 6756.75Mbps (MCS 24) Low data rate 385Mbps (MCS 1) Carrier frequency 60GHz Path loss exponent 2 Directional antenna gain 3.01(180), 7.78(60), 0.79dBi(30) Radiation angle 30, 45, 60, 90 Receiver sensitivity -78dBm (MCS 0) Transceiver efficiency 0.7, 0.8, 0.9, 1