Wimax 4

WIMAX ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction A WIMAX tower An example of WIMAX receiver : PCMCIA card

PLAN ,[object Object],[object Object],[object Object]

I Transmission of the data ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 Mac and physical layer s

1 Mac and physical layer s ,[object Object],[object Object],[object Object],[object Object]

1 Mac and physical layer s ,[object Object],[object Object]

2 structur e of a SDU ,[object Object],[object Object]

3 S tructure of a M PDU ,[object Object],Generic MAC header Payload (optional) CRC (optional) ,[object Object],6 bytes Variable 4 bytes ,[object Object],[object Object]

3 S tructure of a M PDU ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3 S tructure of a M PDU ,[object Object],[object Object],[object Object]

4 Fragmentation and packing ,[object Object],[object Object],[object Object],[object Object],[object Object]

4 Fragmentation and packing ,[object Object],[object Object],[object Object]

4 Fragmentation and packing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

4 Fragmentation and packing ,[object Object],[object Object]

4 Fragmentation and packing ,[object Object]

Summarize PDU which has started in the previous TC packet First PDU which starts in this TC packet Second PDU which starts in this TC packet SDU 1 SDU 2 SDU 3 SDU 4 PDU 1 PDU 2 PDU 3 NO fragmentation & NO packing Packing Fragmentation MAC SDUs MAC PDUs P FEC 1 FEC 2 FEC 3 Preamble TC PDUs BURST FEC encoding

II ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

II ARQ ,[object Object],[object Object],[object Object],[object Object]

II ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object]

Stop and Wait ,[object Object],[object Object],[object Object]

Stop and Wait retransmission Transmitting Data 1 3 2 3 Time Received Data 1 2 3 Time ACK ACK NAK Output Data 1 2 3 Time Error ACK: Acknowledge NAK: Negative ACK

Stop and Wait ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],The sliding window technique:

II ARQ ,[object Object],[object Object],[object Object],Transmitter Receptor Transmitter Receptor

Feedback ( go back-N) ,[object Object],[object Object],[object Object],[object Object]

Feedback ( go back-N) 1 Time NAK Time Error Go-back 3 2 3 4 5 3 4 4 5 6 7 5 1 2 3 4 4 5 Error NAK Go-back 5 1 2 3 4 4 5

Selective repeat ,[object Object],[object Object]

Selective repeat 1 Time NAK Error Retransmission 2 3 4 5 3 6 7 8 9 7 1 Time 2 4 3 6 8 7 Error NAK Retransmission 5 9 1 Time 2 4 3 6 8 7 5 9 1 Time 2 4 3 6 8 7 5 9

FEC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

FEC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],FEC

H-ARQ ,[object Object],[object Object],[object Object]

Methods used by WIMAX ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Methods used by WIMAX

[object Object],Methods used by WIMAX ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Methods used by WIMAX

Methods used by WIMAX ,[object Object],[object Object],[object Object],[object Object]

III Downlink/Uplink Scheduling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

III Downlink/Uplink Scheduling ,[object Object],[object Object],[object Object]

A Downlink Scheduling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Downlink Scheduling

RR 1 1 1 VCC 1 (Source 1) 2 2 VCC 2 (Source 2) 3 3 3 VCC 3 (Source 3) 3 3 1 2 3 1 1 2 WRR scheduler Counter Reset Cycle 1 3 2 2 3 3 … . ,[object Object]

RR ,[object Object],[object Object],[object Object]

WRR ,[object Object],[object Object],Counter Reset Cycle Coefficients of performance … . 1 1 1 VCC 1 (Source 1) 2 2 VCC 2 (Source 2) 3 3 3 VCC 3 (Source 3) 3 3 2 1 3 1 2 3 1 1 1 2 3 3 3 3 3 WRR scheduler

[object Object],[object Object],WRR VCC 2 (Source 2) VCC 3 (Source 3) …… . 1 1 1 VCC 1 (Source 1) 2 2 3 3 3 3 3 2 1 3 1 2 3 1 1 1 2 3 3 3 3 3 WRR scheduler Counter Reset Cycle Sequence of scheduling

VT ,[object Object],[object Object],[object Object],Connection 1 Average inter-arrival : 2 units Connection 2 Average inter-arrival : 5 units Connection 3 Average inter-arrival : 5 units First-Come-First-Served service order Virtual times Virtual Clock service order

[object Object],[object Object],WFQ

[object Object],[object Object],[object Object],WFQ

WFQ WFQ Scheduler flow 1 flow 2 flow n Classifier Buffer management

[object Object],[object Object],[object Object],[object Object],WFQ WRR algorithm w 1 w 2 w n R Packet queues

WFQ w 1 water pipes w 2 w 3 t 1 t 2 w 2 w 3 water buckets w 1

WFQ ,[object Object],[object Object],[object Object]

WFQ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],WFFQ

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],WFFQ and WFQ

Connection 1 Connection 2 Connection 11 WFQ and WFFQ WFQ Service Order WFFQ Service Order …… … … … … ,[object Object],WFFQ and WFQ

VT and WFQ ,[object Object],[object Object],[object Object],[object Object],[object Object]

D R R ,[object Object],[object Object],[object Object],[object Object]

D R R Q i DC i 3500 3500 2800 7800 2000 1500 5000 700 1400 2800 7800 2000 2800 7800 2000 2800 7800 2000 2800 7800 2000 initializing ( 1 st round) Serviced Not serviced Serviced Serviced (3 rd round) (4 th round) +3500 +3500 ( 2nd round) +3500 -2000 -7800 -2800 Li

D D R R ,[object Object],[object Object],[object Object],[object Object]

D D R R Q i DC i 3500 3500 2800 7800 2000 1500 -6300 -2800 700 -2100 2800 7800 2000 2800 7800 2000 2800 7800 2000 2800 7800 2000 2800 7800 2000 initializing (1 st round) Serviced Serviced Not serviced (2 nd round) Not serviced (3 rd round) Serviced -2000 -7800 -2800 +3500 +3500 +3500 +3500

B Uplink Scheduling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bibliography ,[object Object],[object Object],[object Object]

Wimax 4

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