Improving energy efficiency in optical access networks | |
| Author | Bokhari, Syed Muzamil Ali |
| Call Number | AIT Diss no.TC-13-03 |
| Subject(s) | Optical communications Data transmission systems|xManagement |
| Note | A dissertation submitted in partial ful llment of the requirements for the degree of Doctor of Philosophy in Telecommunications, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. TC-13-03 |
| Abstract | Improving the energy eciency has become an important aspect of designing optical access networks to minimize their carbon footprints. In this context, Interleaved Polling with Adaptive Cycle Time (IPACT) with the sleep mode is considered as a medium access control (MAC) scheme to improve the energy eciency of passive optical networks (PONs). For energy saving, the sleep mode of each ONU is activated based on the packet queue length for upstream trac. We model such a PON as an N-user M/G/1 queue with reservations and vacations. Based on the framework of M/G/1 queueing analysis with some modi cation made to incorporate the nature of IPACT as well as the sleep mode, we derive an approximated closed form expression of the mean packet delay. As a practical application of our analytical results, we provide an approximated computational procedure to suggest the sleep period given the QoS requirement on the maximum mean packet delay. We then extend the sleep mode for IPACT by considering packet delay constraints for both upstream and downstream transmissions. The main decision criterion for energy saving is to put an ONU in the sleep mode when no upstream and downstream trac exists, without impairing the desired QoS requirements. Simulation experiments are conducted to validate the analytical results and to show that the results are relatively insensitive to packet arrival statistics for large sleep periods. Hence, our analytical results may also be applied to more practical scenarios with non-Poisson packet arrivals. |
| Year | 2013 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. TC-13-03 |
| Type | Dissertation |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Poompat Saengudomlert; |
| Examination Committee(s) | Teerapat Sanguankotchakorn;Tripathi, Nitin K.; |
| Scholarship Donor(s) | University of Balochistan Quetta, Pakistan - AIT Fellowship; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2013 |