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802.11 frame: addressing - PowerPoint PPT Presentation


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6. 4. 2. 2. 6. 6. 6. 2. 0 - 2312. frame control. duration. address 1. address 2. address 3. address 4. payload. CRC. seq control. 802.11 frame: addressing. Address 3: used only in ad hoc mode. Address 1: MAC address of wireless host or AP to receive this frame.

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Presentation Transcript
802 11 frame addressing

6

4

2

2

6

6

6

2

0 - 2312

frame

control

duration

address

1

address

2

address

3

address

4

payload

CRC

seq

control

802.11 frame: addressing

Address 3: used only in ad hoc mode

Address 1: MAC address

of wireless host or AP

to receive this frame

Address 3: MAC address

of router interface to which AP is attached

Address 2: MAC address

of wireless host or AP

transmitting this frame

slide2

router

AP

Internet

R1 MAC addr AP MAC addr

source address

dest. address

802.3frame

AP MAC addr H1 MAC addr R1 MAC addr

address 3

address 2

address 1

802.11 frame

802.11 frame: addressing

H1

R1

slide3

6

4

2

2

6

6

6

2

0 - 2312

frame

control

duration

address

1

address

2

address

3

address

4

payload

CRC

seq

control

2

2

4

1

1

1

1

1

1

1

1

Protocol

version

Type

Subtype

To

AP

From

AP

More

frag

Retry

Power

mgt

More

data

WEP

Rsvd

802.11 frame: more

frame seq #

(for reliable ARQ)

duration of reserved

transmission time (RTS/CTS)

frame type

(RTS, CTS, ACK, data)

wireless man 802 16
Compared to 802.11

provides a communications path between a subscriber site and a core network

802.16 hooks up buildings

Distances involves several kilometers

Signal strength varied widely among buildings

Each cell have many more users than 802.11

More bandwidth should be allocated, at high frequency band

Signal is more sensitive to weather

Downlink: time slots

Uplink: request-approval-release

Guaranteed slots

best effort slots.

Wireless MAN: 802.16
bluetooth 802 15
Used to wirelessly transfer data among devices.

Original goal: get ride of the serial cable or USB cable.

Upload picture from you cellular phone to desktop PC

Wireless headphone…

Short-range radio frequency (RF) technology

Operates at 2.4 GHz

Interfere with 802.11

Effective range of Bluetooth devices is 32 feet (10 meters).

Data at the rate of 1 Mbps

Compared to 802.11

Slow,Low Power, and Short range

Master / slave architecture, no collision

Bluetooth: 802.15
wireless cellular network
Wireless Cellular Network
  • Primary for voice communication
    • Connected to ground telephone network.
  • Infrastructure-based network
    • Mobile station, Base station, mobile switching center,
  • Large coverage: a cell could span several miles long.
  • 1G, 2G, and 3G
  • Accessing technology: FDMA, TDMA, CDMA
  • Frequency reuse
    • How to reduce interference among cells, while maximize number of subscriber?
  • Issues:
    • Continuous service
    • No call dropping
    • Smooth handoff
    • Able to support reasonable concurrent subscribers: to make enough revenue.
    • Support data service