Distributed cooperative and opportunistic sheduling in ad hoc networks with power management | |
| Author | Pradhan, Sunaj Lal |
| Call Number | AIT Thesis no.ICT-08-13 |
| Subject(s) | IEEE 802.11 (Standard) Ad hoc networks (Computer networks) |
| Note | A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Information and Communications Technologies, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ICT-08-13 |
| Abstract | Various algorithms that implement opportunistic scheduling have been proposed in ad hoc network. Among them, Cooperative and Opportunistic Scheduling Scheme takes into account both the channel condition and the QoS requirement of the flows to make globally optimal scheduling decision. The Cooperative and Opportunistic Scheduling scheme however is based on fixed transmit power approach. The IEEE 802.11 b standard, upon which most of the ad hoc developments have been based, offers four different data rates. For each of the data rates a SNR threshold is defined at the receiver to determine the achievable data rate and transmission is made at that data rate at the maximum power. But the minimum power required to achieve the transmission successfully is usually lower than the maximum transmit power. So, there is wastage of power if fixed transmit approach is used. Since, power is an important issue in any kind of communication network proper power management must also be implemented in the scheduling scheme. In this thesis, the effect of varying the transmit power of the nodes on the overall throughput of the network and the average power of the network is studied in a two transmitter scenario. The transmit power of the nodes is varied from the maximum transmit power to the minimum transmit power required to achieve the threshold SNR at the receiver for the chosen data rate. Simulation experiments are carried out for different cases by varying the maximum transmit power level, varying the orientation of nodes and varying the length of data packet. The simulation results showed that the proposed power management scheme can reduce the overall transmit power of the network with or without marginal degrading the overall throughput of the network by. In some cases, the scheme provided better throughput of the network as well. The fraction or percentage of excess power (difference of the maximum transmit power and the minimum power required to achieve the threshold SNR corresponding to the achievable data rate at the receiver) that should be used to obtain power saving along with throughput maximization varied from case to case. Through simulation, 20 % reduction in the excess power seemed to satisfy the requirement of power saving without or with a marginal decrease of overall network throughput for almost all the cases. With this, significant saving in the network transmit power can be achieved |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ICT-08-13 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Information and Communication Technology (ICT) |
| Chairperson(s) | Ahmed, Kazi M.; |
| Examination Committee(s) | Rajatheva, R. M. A. P.;Erke, Tapio J.; |
| Scholarship Donor(s) | Findland;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |