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IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to.

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Presentation on theme: "IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to."— Presentation transcript:

1 IEEE 802.11 a b g

2 802.11 reference model

3 Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to PHY serviceAdapts PMD to PHY service Physical layer convergence procedurePhysical layer convergence procedure Map MPDU (Mac PDU) into frame Map MPDU (Mac PDU) into frame Physical medium dependent system Physical medium dependent system Define characteristics and method to transmit and receive dataDefine characteristics and method to transmit and receive data

4 ISM PHY Clause 14 Clause 14 Frequency-Hopping SS (2.4GHz ISM)Frequency-Hopping SS (2.4GHz ISM) Clause 15 Clause 15 Direct sequence SS (2.4GHz ISM)Direct sequence SS (2.4GHz ISM) 1 or 2Mb/s1 or 2Mb/s Clause 16 Clause 16 InfraredInfrared Clause 17 (a) Clause 17 (a) OFDM (5GHz Unlicensed-National Information infrastructure)OFDM (5GHz Unlicensed-National Information infrastructure) 6*, 9, 12*, 18, 24*, 36, 48, 54 Mb/s6*, 9, 12*, 18, 24*, 36, 48, 54 Mb/s Clause 18 (b) Clause 18 (b) High rate DSSSHigh rate DSSS 1*, 2*, 5.5*, 11*Mb/s1*, 2*, 5.5*, 11*Mb/s Clause 19 (g) Clause 19 (g) Extended rateExtended rate ERP-DSSS/CCK ERP-DSSS/CCK ERP-OFDM ERP-OFDM ERP-PBCC (Packet binary convolutional coding) ERP-PBCC (Packet binary convolutional coding) 22, 33 Mb/s22, 33 Mb/s DSSS-OFDM DSSS-OFDM DSSS preamble and header, OFDM payloadDSSS preamble and header, OFDM payload 6, 9, 12, 18,24, 36, 48, 546, 9, 12, 18,24, 36, 48, 54

5 802.11 a, PLCP format

6 802.11 a,PLCP preamble

7 802.11 b, PLCP format

8 802.11g, long PLCP format

9 802.11g, short PLCP format

10 DSSS-OFDM PSDU

11 802.11g, signal segments

12 Single carrier to multicarrier

13 CTS-to-self (802.11g) CTS frame with RA equal to its MAC CTS frame with RA equal to its MAC Overhead cost lower than CTS/RTS Overhead cost lower than CTS/RTS Less robust against hiddle nodes and collisions Less robust against hiddle nodes and collisions

14 aCWmin aSlotTime long=20us, short=9us aSlotTime long=20us, short=9us aCWmin(0)=31, aCWmin(1)=15 aCWmin(0)=31, aCWmin(1)=15

15 Multi-rate support All control frames shall be transmitted at BSSBasicRateSet All control frames shall be transmitted at BSSBasicRateSet All broadcast or multicast frame shall be transmitted at BSSBasicRateSet All broadcast or multicast frame shall be transmitted at BSSBasicRateSet Control response frame at the highest rate in BSSBasicRateSet that <= the rate of the immediately previous frame, and the same PHY options Control response frame at the highest rate in BSSBasicRateSet that <= the rate of the immediately previous frame, and the same PHY options

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