Journal Review 1st Draft [doc]

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Computer Science

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Oct 30, 2023

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In their research paper, “Loop-Free Hybrid Single-Path/Flooding Routing Algorithms with Guaranteed Delivery for Wireless Networks”, Ivan Stojmenovic and Xu Lin aim to design a protocol that would produce the most desirable qualitative and quantitative properties for routing algorithms. They proposed hopping-and-flooding-based modifications to prior researched routing algorithms such as DIR, MFR, and GEDIR to enhance the delivery rate and shorten device hopping. The authors present their research by proving the loop-free property of GEDIR (Geographic Distance Routing) and MFR (Most Forward within Radius algorithm). They then evaluate the performance of their modifications through simulation experiments, primarily using unit graphs constructed to model ad hoc wireless networks. The article starts by emphasizing the importance and growth of wireless networks of sensors as they significantly enhance our capacity to remotely monitor and control our environment, while also improving the accuracy of information gathering and processing. Lin and Stojmenovic firmly believe that modifying and further improving the networks of sensors’ ability to operate data sensing in a larger scope would revolutionize information gathering and processing in many situations and environments such as disaster relief, conferences, and battlefields. The article then reviews existing GPS-based routing methods and their performance and drawbacks, which are then used to forward the main focus of the research paper: the idea of a loop-free hybrid single-path/flooding routing algorithm. First, the authors explain the loop-free nature of the chosen MFR (most forward within radius routing) and GEDIR (geographical distance routing) algorithms. By being loop-free, these algorithms avoid wasting time and memory with past traffic, which explains why they are selected for modification. With the chosen algorithms, the writers design a node-choosing-and-hopping routing called 2-hop, which basically sends information to the nearest neighbor of the desired location and then to that Ha Le
location. Additionally, to keep the number of message transmissions and the shortest possible hop count between two nodes, which is called the flooding rate, low, the creators suggest flooding only at concave nodes instead of full flooding. Finally, Stojmenovic and Lin propose their hybrid single-path/flooding routing design. The process starts with the source flooding a message of only key data like the containing source, destination IDs, source location, and the number of additional bits. This minimalized message only requires retransmission to the desired location from only half of the nodes in the networks, which cuts overheads and collisions. After receiving the short message, the desired location now sends back another similar message to the source, which now allows the source to locate and directly route toward the desired location. From this conducted study, I have established a couple of helpful information about the routing task of wireless networks. The first one is the seven base metrics that the authors used as the base properties when assessing the performance of a routing protocol. Lin and Stojmenovic have taught me more about the approaches to better efficiency of networking sensors and information gathering, like other properties such as message delivery, hop counts, and loop freedom, especially when dealing with wireless networks. The second one is the hopping-and- flooding-based methods that the authors came up with when searching for localized routing methods that satisfy all seven of the aforementioned metrics. Since this is the topic of the paper, it is of course what I pay attention to the most when reading through the paper. And though the author’s routing method comes with a lot of experiments that prove its superiority over past algorithms, I agree with their conclusion that better approaches can be found and the search is far from over. Ha Le
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