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Hopping Sequences: Types vs. Number
Original Post: hopping sequences-number of devices (SIG Forum)
Date: 2000-04-10
10 different types of hopping sequences have been defined, five for the
79-hop and five for the 23-hop system,respectively. However it is
important to remember that these hopping systems are "TYPES of
hopping sequences", not "hopping sequences". One of these
types (channel hopping seq.) is used in for piocnet communication. The
other 4 types are used for the different substates of a device: paging,
page response, inquiring and inquiry response. As the names of the
systems, i.e. 79 hop or 23 hop system, say, you can use up to 79 hopping
sequences (or 23 hopping seq.) in your scatternet, each for a piconet
For the 79 hop systems, you can theoretically have 79 devices all
sending at the same time in different piconets. However, the rate of
collisions will be huge. The hopping sequence while connected is dependant
on the clock of the master and its address. The other hopping sequences
are only for finding other devices and making connections. So once you
have your devices all connected up, you only have the one hopping sequence
to worry about. The limit therefore is on the number of masters in an
area. Say you have 10 masters, you can have upto 70 slaves active at the
same time. With 20 masters you can have upto 140 active slaves etc.
Scatternets are just ways of connecting a single device to multiple
masters |
