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Performance Improvement of Content Delivery Wireless Networks

Tahmasbi Nejad, Mohammad Ali | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48839 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Hossein Khalaj, Babak
  7. Abstract:
  8. Nowadays, enormous amounts of data are transferred through data communication networks every day in order to fulfill end users’ demands all over the world.The capacities of the links between network nodes, or in other words, the amount of bandwidth available to carry data is undoubtedly one of the most expensive resources as well as the one of most importance which not only plays an essential role in communicating information packets over such a vast network, but is a major determinant of Quality of Service (QoS) in terms of rapidity as well. The idea of using cache memories to optimize network bandwidth consumption laid the foundation for developing Content Delivery Networks (CDNs). In such networks, storing the popular contents requested by end users in the nodes’ caches results in shortening the distance between the source and the destination of a network packet, which leads to bandwidth usage reduction as well as a higher level of Quality of Service in general, and less latency in particular.In the present study, linear network model for content delivery, which includes Content Delivery Wireless Networks (CDWNs), is considered when the servers are equipped with caches of limited size. Data storage and delivery strategies are proposed in order to achieve the optimum delay of fulfilling all the users’ demands through such networks, and afterwards it is generalized to Multiple-Input MultipleOutput (MIMO) wireless networks. This achievable delay indicates that caches whether on the server side or on the user side are of equal value; analyzing the aforementioned networks under more practical conditions, however, led us to deduce that caches are of more benefit on the receiver side.Concentrating the work’s attention more on wireless networks, we proceed to consider a cache-aided wireless broadcast channel. Then, the optimum transmission method attaining maximum aggregate rate at which data is received by all the users is introduced, and this optimum sum rate is calculated. We, next, suggest a random graph model of content delivery Peer-to-Peer (P2P) networks to formulate caching problem phases. Proving the computational complexity of finding the optimum way of communicating data in such networks, we propose a heuristic algorithm in order to gain the sub-optimum system’s performance as far as the amount of information received by users in a given amount of time concerned
  9. Keywords:
  10. Cache Memory ; Content Delivery Network (CDN) ; Multiple Input Multiple Output (MIMO)System ; Wireless Networks ; Broadcast Channel ; Peer-to-Peer Network

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