Download Wireless Personal Area Networks (WPANs) PDF

TitleWireless Personal Area Networks (WPANs)
LanguageEnglish
File Size4.8 MB
Total Pages113
Document Text Contents
Page 1

Wireless Personal Area Networks
(WPANs)

Page 2

2

Outline

 IEEE Project 802 and 802.15 Working
Group

 Bluetooth (IEEE 802.15.1)
 Coexistence (IEEE 802.15.2)
 LR-WPAN (ZigBee and IEEE 802.15.4)

Page 56

Channel Classification
(cont’d)

• Since master device needs channel condition tables
of its slaves, the tables can be exchanged using
LMP messages

• It is also possible to use implicit classification
methods such as negative ACKs, in which cases
the slave does not have to send any additional
information to the master

• Overall classification time can be reduced by
grouping channels to blocks, which naturally
reduce the accuracy

Page 57

Channel Classification
(cont’d)

• In ‘Adaptive Frequency Hopping’ method,
global state of each FH channel is needed

• The master obtains it by taking a weighted
average of its own channel state and all the
active slaves’ channel states

• Finally, a global channel state for one sub-
channel is obtained by threshold
comparison of the average, which have
value in [0,1]

Page 112

112

My Universal Privilege Device

 Announces my access privileges to
things & services. Maybe identity &
authentication as well

 At home, I am the superuser. At
office, a humble worker :-)

 Only works on me. Talks to the
various login controls and hooks
me up with minimum hassle

Page 113

113

Thanks

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