Week 4: Debug & Basic design of poster

There are five tasks for this week.

1.     Achieving the coding of position of sink (base station).

2.     Comparing the performance of three protocols.

3.     Collecting the number of data packets of each nodes.

4.     Considering the diversity of the solar energy for each node.

5.     Working on design the poster and obtain the basic frame of poster.

After discussing with supervisor, the diversity of solar energy had been solved. The diversity means that for different nodes in various position, the collection efficiency for each nodes is different. Thus, in the beginning of the program, a random percentage is produced for total solar energy of each sensors.

Last week, the method of determining the position of sink was achieved. This week, the coding is compiled successfully. The main way is to find the minimum number of connection hops. This week, the lifetime of three protocols is compared. However, optimizing solution based on SPIN has some problems due to the lifetime is less than time of gossiping.

For better observing the behavior of each nodes, the number of data packets of each nodes is visualized by histogram which is shown below.

Figure 1: the number of data packets of each node

Meanwhile, the fundamental knowledge which is called WSN OSI LAYER for this project is introduced. There are five layers for wireless sensor networks and each layer has specific functions.

• Physical layer
• Application layer
• Transport layer
• Network layer
• Data link layer

The main layer is physical layer and its function is to provide interface to transmit steam of bits. The existence of transport layer is for deciding the protocol. The coding and operation of whole program is based on this basic principal knowledge.

In addition, the frame of poster is designed and the rough layout is shown below.

Figure 2: the first layout of poster

Final week, the main object is to debug three touting protocols and achieve final design of poster. In addition, we will prepare for bench inspection in Week 6 and discuss some possible questions.