Performance improvement of periodic flows in multi hop wireless sensor networks
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Performance improvement of periodic flows in multi hop wireless sensor networks
Performance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfo Performance improvement of periodic flows in multi hop wireless sensor networks ormance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anh Huy43466Doctoral Thesis at Osaka Prefecture UniversitySummaryIn recent years, the demand for wireless networks treating various types of periodic flows increased, for example, wireless sensor networks (WSNs) for he Performance improvement of periodic flows in multi hop wireless sensor networks althcare, smart meter networks, or structural health. Particularly, in healthcare networks, there are numerous periodic data flows, such as blood presPerformance improvement of periodic flows in multi hop wireless sensor networks
sure, heart rate, and blood oxygenation level. In such wireless networks treating periodic flows, the following problems must be solved.Firstly, perioPerformance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfo Performance improvement of periodic flows in multi hop wireless sensor networks pecifically, if the packet generation timing on different source nodes overlaps, packet collisions among the different interfering flows occur continually, until the interfering sessions are terminated. Although the IEEE 802.11 distributed coordination function (DCF) fixes packet collisions, its ran Performance improvement of periodic flows in multi hop wireless sensor networks dom backoff to avoid subsequent packet collisions and retransmission reduces network effective bandwidths, which results in packet loss due to networkPerformance improvement of periodic flows in multi hop wireless sensor networks
congestion. Additionally, the workloads for relay nodes increase due to the retransmission and timer expiration processes. Therefore, another collisiPerformance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfo Performance improvement of periodic flows in multi hop wireless sensor networks lem is the problem that occurs when a node (node A) is visible to a node (node B) but not to other node (node C) which is communicating with node B. When these nodes are in hidden node topology, if node c is transferring packet to node B, and node A alsohttps://khothuvien.cori!iiSUMMARYstart transfe Performance improvement of periodic flows in multi hop wireless sensor networks rring packet to node B. a collision occurs. This collision will not happen if node A is in range of node c and thus knows that node c is transferringPerformance improvement of periodic flows in multi hop wireless sensor networks
its packet to node B Hidden node problem also becomes serious in addition to general contention between data flows. Moreover, once periodic packet traPerformance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfo Performance improvement of periodic flows in multi hop wireless sensor networks of sending packets are based on time division multiple access (TDMA). However, TDMA is not widely spread for the following reasons. First, the installation cost of nodes is expensive. Second. TDMA is not suitable for dynamically changing network environments and TDMA-based systems need complicated c Performance improvement of periodic flows in multi hop wireless sensor networks ontrols, such as time synchronization.This thesis attempts to propose methods to improve the performance of periodic flows in wireless sensor networksPerformance improvement of periodic flows in multi hop wireless sensor networks
(WSNs). Furthermore, we try to avoid the constraints of the related work such as time synchronization and high installation costAs for the detailed cPerformance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfo Performance improvement of periodic flows in multi hop wireless sensor networks solutions. In particular, this thesis will focus on two problems, the inherent problem of continual packet collisions and the compounded effect of the hidden node and the continuous collision problems.In Chapter 2 and Chapter 3. we tackle the first challenge of this thesis which is the problem of c Performance improvement of periodic flows in multi hop wireless sensor networks ontinual packet collisions by shifting the packet generation timing. In Chapter 2. we propose a simple method to choose the shift-time. The simulationPerformance improvement of periodic flows in multi hop wireless sensor networks
in single-hop network environment shows the positive results.In Chapter 3. we propose a new formula for predicting whether two heterogeneous periodicPerformance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfo Performance improvement of periodic flows in multi hop wireless sensor networks he packet generationPerformance improvement of periodic flows in multi-hop wireless sensor networksNguyen Anil Huy43466Doctoral Thesis at Osaka Prefecture UniversityPerfoGọi ngay
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