3. B A C K G R O U N D SMART GRIDS SMART METERS CURRENTLY USED
- MASTER SLAVE SCHEME 3
4. A smart grid is an electricity network based on digital
technology that is used to supply electricity to consumers via
two-way digital communication. 4
5. There are three main benefits to smart meters: SMART METER
More accurate No one has to come to your home to read your meter
Better oversight and management of our energy use 5
6. CURRENTLY USED SCHEME The master (in this case, the
substation) requests data from each slave (the secondary
substation) in a Round Robin fashion. Master sends a data-request
packet to the intended slave, followed by a transmission of data
from slave If the data is received correctly, the master proceeds
to the next slave. Otherwise, the master repeats the process 7
7. GIST NETWORK CODING RLNC TUNABLE SPARSE CODING ONE PHASE (
NC) TWO PHASE ( NC- fb) 8
8. 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
9. Tunable Sparse Coding There are three key ideas in tunable
sparse network coding: 1 Sparse coding is more beneficial at the
beginning of a transmission session 2 Dense coding is required
towards the end of the sessions for fast completion 3 Sparse coding
translates in reduced complexity 11
10. C O M P A R I S O N R E S U L T S 13
11. COMPARISON SETTINGS NS-2 network simulator Wireless Setting
Collects one packet of 100 bytes from each sender every 15 min.
FIRST EXPERIMENT 14
12. 15 BS and the secondary substations are positioned within a
rectangle of 3300 m per 2500m. Around each substation, we add 32
households
13. (a) Average percentage of collected packets (c)Average
collection time 16
14. 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. SECOND EXPERIMENT
17
15. (b)Average percentage of collected packets. (c) Average
collection time. 18
16. With network coding, the data packets are collected much
sooner than the defined deadline. 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. 19