X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/JournalMultiPeriods.git/blobdiff_plain/ce36745985ea29d243398f943d61ea7a96e16d15..98f56bd39ecefc67d93931a6717ed20c2824304a:/article.tex

diff --git a/article.tex b/article.tex
index 06b041f..53747de 100644
--- a/article.tex
+++ b/article.tex
@@ -159,6 +159,8 @@ demonstrate  the  usefulness  of   the  proposed  approach.   Finally,  we  give
 concluding    remarks   and    some    suggestions   for    future   works    in
 Section~\ref{sec:conclusion}.
 
+
+%%RC : Related works good for a phd thesis but too long for a paper. Ali you  need to learn to .... summarize :-)
 \section{Related works} % Trop proche de l'etat de l'art de l'article de Zorbas ?
 \label{rw}
 
@@ -426,7 +428,7 @@ is the subject of another study not presented here.
 %The sensor node enter in listening mode waiting to receive ActiveSleep packet from the leader after the decision to apply multi-round activity scheduling during the sensing phase. Each sensor node will execute the Algorithm~1 to know who is the leader. After that, if the sensor node is leader, It will execute the integer program algorithm ( see section~\ref{cp}) to optimize the coverage and the lifetime in it's subregion. After the decision, the optimization approach will produce the cover sets of sensor nodes to take the mission of coverage during the sensing phase for $T$ rounds. The leader will send ActiveSleep packet to each sensor node in the subregion to inform him to it's schedule for $T$ rounds during the period of sensing, either Active or sleep until the starting of next period. Based on the decision, the leader as other nodes in subregion, either go to be active or go to be sleep based on it's schedule for $T$ rounds during current sensing phase. the other nodes in the same subregion will stay in listening mode waiting the ActiveSleep packet from the leader. After finishing the time period for sensing, which are includes $T$ rounds, all the sensor nodes in the same subregion will start new period by executing the MuDiLCO protocol and the lifetime in the subregion will continue until all the sensor nodes are died or the network becomes disconnected in the subregion.
 
 \subsection{Background idea}
-
+%%RC : we need to clarify the difference between round and period. Currently it seems to be the same (for me at least).
 The area of  interest can be divided using  the divide-and-conquer strategy into
 smaller  areas,  called  subregions,  and  then our  MuDiLCO  protocol  will  be
 implemented in each subregion in a distributed way.
@@ -448,11 +450,14 @@ sensing task.
 %For each round a set of sensors (said a cover set) is responsible for the sensing task.
 
 This protocol is  reliable against an unexpected node  failure, because it works
-in periods.  On the one hand,  if a node  failure is detected before  making the
+in periods. 
+%%RC : why? I am not convinced
+ On the one hand,  if a node  failure is detected before  making the
 decision, the node  will not participate to this phase, and,  on the other hand,
 if the node  failure occurs after the decision, the sensing  task of the network
 will be  temporarily affected:  only during  the period of  sensing until  a new
 period starts.
+%%RC so if there are at least one failure per period, the coverage is bad...
 
 The  energy consumption  and some  other constraints  can easily  be  taken into
 account,  since the  sensors  can  update and  then  exchange their  information
@@ -465,7 +470,7 @@ monitor the area.
 
 We define two types of packets that will be used by the proposed protocol:
 \begin{enumerate}[(a)] 
-\item INFO  packet: a such packet  will be sent by  each sensor node  to all the
+\item INFO  packet: such a  packet  will be sent by  each sensor node  to all the
   nodes inside a subregion for information exchange.
 \item  Active-Sleep  packet: sent  by  the  leader to  all  the  nodes inside  a
   subregion to  inform them to remain Active  or to go Sleep  during the sensing
@@ -523,17 +528,17 @@ activated in  the following  sensing phase  to cover the  subregion to  which it
 belongs.  The integer  program will produce $T$ cover sets,  one for each round.
 The WSNL will send an Active-Sleep  packet to each sensor in the subregion based
 on the algorithm's results, indicating if  the sensor should be active or not in
-each  round of the  sensing phase.  The integer  program is  based on  the model
-proposed by \cite{pedraza2006} with some modification, where the objective is to
-find a maximum number of disjoint cover sets.  To fulfill this goal, the authors
-proposed  an integer  program  which forces  undercoverage  and overcoverage  of
-targets to become minimal at the  same time.  They use binary variables $x_{jl}$
-to indicate if sensor  $j$ belongs to cover set $l$.  In  our model, we consider
-binary variables $X_{t,j}$ to determine  the possibility of activation of sensor
-$j$ during  the round $t$  of a given  sensing phase.  We also  consider primary
-points as targets.  The  set of primary points is denoted by  $P$ and the set of
-sensors by  $J$. Only sensors  able to  be alive during  at least one  round are
-involved in the integer program.
+each round  of the  sensing phase.  The  integer program  is based on  the model
+proposed by  \cite{pedraza2006} with some modifications, where  the objective is
+to find  a maximum  number of disjoint  cover sets.   To fulfill this  goal, the
+authors proposed an integer  program which forces undercoverage and overcoverage
+of  targets to  become minimal  at  the same  time.  They  use binary  variables
+$x_{jl}$ to indicate if  sensor $j$ belongs to cover set $l$.   In our model, we
+consider binary  variables $X_{t,j}$ to determine the  possibility of activation
+of sensor $j$ during  the round $t$ of a given sensing  phase.  We also consider
+primary points as targets.  The set of  primary points is denoted by $P$ and the
+set of sensors by  $J$. Only sensors able to be alive  during at least one round
+are involved in the integer program.
 
 %parler de la limite en energie Et pour un round
 
@@ -612,6 +617,9 @@ U_{t,p} \in \lbrace0,1\rbrace, \hspace{10 mm}\forall p \in P, t = 1,\dots,T  \la
 %(W_{\theta}+W_{\psi} = P)    \label{eq19} 
 %\end{equation}
 
+%%RC why W_{\theta} is not defined (only one sentence)? How to define in practice Wtheta and Wu?
+
+
 \begin{itemize}
 \item $X_{t,j}$:  indicates whether  or not the  sensor $j$ is  actively sensing
   during the round $t$ (1 if yes and 0 if not);
@@ -707,6 +715,9 @@ precisely, the  deployment is controlled  at a coarse  scale in order  to ensure
 that  the deployed  nodes can  cover the  sensing field  with the  given sensing
 range.
 
+%%RC these parameters are realistic?
+%% maybe we can increase the field and sensing range. 5mfor Rs it seems very small... what do the other good papers consider ?
+
 \begin{table}[ht]
 \caption{Relevant parameters for network initializing.}
 % title of Table
@@ -815,11 +826,11 @@ COMPUTATION & on & on & on & 26.83 \\
 % is used to refer this table in the text
 \end{table}
 
-For sake  of simplicity we  ignore the  energy needed to  turn on the  radio, to
+For the sake of simplicity we ignore  the energy needed to turn on the radio, to
 start up the sensor node, to move from one status to another, etc.
 %We also do not consider the need of collecting sensing data. PAS COMPRIS
-Thus, when  a sensor becomes active  (i.e., it already decides  it's status), it
-can turn its  radio off to save  battery. MuDiLCO uses two types  of packets for
+Thus, when a sensor becomes active (i.e., it already decides its status), it can
+turn  its radio  off to  save battery.  MuDiLCO uses  two types  of  packets for
 communication. The size of the  INFO packet and Active-Sleep packet are 112~bits
 and 24~bits  respectively.  The  value of energy  spent to send  a 1-bit-content
 message is  obtained by using  the equation in  ~\cite{raghunathan2002energy} to
@@ -858,7 +869,7 @@ of grid points  in the sensing field of  the network. In our simulations $N = 51
 % Therefore, for our simulations, the error in the coverage calculation is less than ~ 1 $\% $.
 
 \item{{\bf Number  of Active Sensors Ratio  (ASR)}:} it is important  to have as
-  few  active  nodes  as  possible  in  each  round,in  order  to  minimize  the
+  few  active  nodes  as  possible  in  each  round, in  order  to  minimize  the
   communication overhead  and maximize the network lifetime.  The Active Sensors
   Ratio is defined as follows:
 \begin{equation*}
@@ -921,7 +932,6 @@ network in round $t$.
 
 \end{enumerate}
 
-%%%%%%%%%%%%%%%%%%%%%%%%VU JUSQU ICI**************************************************
 
 \section{Results and analysis}
 
@@ -929,8 +939,13 @@ network in round $t$.
 
 Figure~\ref{fig3} shows  the average coverage  ratio for 150 deployed  nodes. We
 can notice that for the first thirty rounds both DESK and GAF provide a coverage
-which is a little bit better than the  one of MuDiLCO-T. This is due to the fact
-that in  comparison with MuDiLCO that  uses optimization to put  in SLEEP status
+which is a little bit better than the one of MuDiLCO-T.  
+%%RC : need to uniformize MuDiLCO or MuDiLCO-T?
+
+%%RC maybe increase the size of the figure for the reviewers, no?
+
+This is due to the fact
+that in comparison with MuDiLCO-T that  uses optimization to put in SLEEP status
 redundant sensors,  more sensor  nodes remain  active with DESK  and GAF.   As a
 consequence,  when the  number  of rounds  increases,  a larger  number of  node
 failures can be observed in DESK and  GAF, resulting in a faster decrease of the
@@ -1018,8 +1033,8 @@ due  to activating a  larger number  of redundant  nodes as  well as  the energy
 consumed during  the different  status of the  sensor node. Among  the different
 versions of our protocol, the MuDiLCO-7  one consumes more energy than the other
 versions. This is  easy to understand since the bigger the  number of rounds and
-the  number of  sensors involved  in the  integer program,  the larger  the time
-computation to  solve the optimization  problem. To improve the  performances of
+the number of  sensors involved in the integer program are,  the larger the time
+computation to solve the optimization problem is. To improve the performances of
 MuDiLCO-7, we  should increase the  number of subregions  in order to  have less
 sensors to consider in the integer program.
 
@@ -1137,7 +1152,9 @@ As a Ph.D.  student, Ali Kadhum IDREES would like  to gratefully acknowledge the
 University  of Babylon  - Iraq  for the  financial support,  Campus  France (The
 French  national agency  for the  promotion of  higher  education, international
 student   services,  and   international  mobility),   and  the   University  of
-Franche-Comt\'e - France for all the support in France.
+Franche-Comt\'e - France for all the support in France. This work is  partially funded by the Labex ACTION program (contract ANR-11-LABX-01-01).
+
+
 
 %% \linenumbers
 
