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Mobile Computing - QoS in Wireless Networks -, Study notes of Mobile Computing

Detail Summery about QoS in Wireless Networks, What’s different in Wireless ?, Wireless Systems, QoS in MANets, QoS in MAC protocols, Ad-hoc network’s security characteristics.

Typology: Study notes

2010/2011

Uploaded on 09/04/2011

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QoS in Wireless Networks
What’s different in Wireless ?
A premium on efficiency (due to limitations
in spectrum resource)
Low reliability in the worst case
Traffic limited by interference
Similar to congestion, but more easily controllable
“Cost” of one stream related not only to rate
parameters, but also to reliability(energy
per bit) and acceptable delay
Best error- control coding techniques are at
the physical and media- access layers
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QoS in Wireless Networks

What’s different in Wireless?

A premium on efficiency (due to limitations

in spectrum resource)

Low reliability in the worst case

Traffic limited by interference

Similar to congestion, but more easily controllable

“Cost” of one stream related not only to rate

parameters, but also to reliability(energy

per bit) and acceptable delay

Best error- control coding techniques are at

the physical and media- access layers

Wireless Systems

Varying Conditions of Radio interface

QoS profile consists of parameters like

precedence:

  • delay: includes radio access delay (uplink)

or radio scheduling delay (downlink), radio

transit delay, GPRS-network transit delay

  • reliability: error rates much higher
  • throughput: specified by maximum bit rate

and mean bit rate

QoS in MAC protocols

MAC protocol design goals

  • solve medium contention
  • deal with hidden/exposed terminal problem

improve throughput

QoS MACs must provide resource

reservation and QoS guarantees to real-

time traffic

  • Wireless LANs – Black burst contention etc
  • Manets – MACA/PR

Ad-hoc network’s security

characteristics:

Availabilityability to use the

information desired

Confidentialityinformation not disclosed

to unauthorized entities

Integrityno corruption

Authenticationensure identity of

correspondent

- Non-repudiationcan’t deny a sent

message