B A C K G R O U N D
• SMART GRIDS
• SMART METERS
• CURRENTLY USED - MASTER SLAVE SCHEME
A smart grid is an electricity network based
on digital technology that is used to supply
electricity to consumers via two-way digital
There are three main benefits to smart
No one has to come to your home to
read your meter
Better oversight and management of
our energy use
The master (in
this case, the
a Round Robin
packet to the
followed by a
of data from
If the data is
the next slave.
• NETWORK CODING
• TUNABLE SPARSE
ONE PHASE ( NC)
TWO PHASE ( NC- fb)
WHY USE NETWORK CODING??
Network coding saves
• one transmission (thus saving energy)
• one time slot (thus reducing the delay)
Structure of the coded packet for the general case.
ATypical wireless coding example 9
Tunable Sparse Coding
There are three key ideas in tunable sparse network coding:
• Sparse coding is more beneficial at the
beginning of a transmission session
• Dense coding is required towards the end of
the sessions for fast completion
• Sparse coding translates in reduced
C O M P A R I S O N R E S U L T S
• NS-2 network simulator
• Wireless Setting
• Collects one packet of 100 bytes
from each sender every 15 min.
• BS and the secondary
substations are positioned within
a rectangle of 3300 m
per 2500m. Around each substation,
we add 32 households
(a) Average percentage of collected packets (c)Average collection time
• Topology shown in fig (a) fitting in a
rectangle of 1000 m per 1400 m.
• 32 households are distributed uniformly at
random within an annulus around each
secondary substation, but with a minimum
radius of 10 m and a maximum radius of
100 m. The remaining
conditions are similar to the 1st experiment.
(b)Average percentage of collected packets. (c) Average collection time.
With network coding, the data packets
are collected much sooner than the
Compared with the MS reference protocol, the
protocols discussed here exhibited a threefold
(without explicit feedback) to tenfold (with explicit
feedback) improvement in the collection time.