| Author | Lohani, Sudha |
| Call Number | AIT Thesis no.TC-13-04 |
| Subject(s) | Long-Term Evolution (Telecommunications)
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Telecommunications |
| Publisher | Asian Institute of Technology |
| Abstract | Call admission control is a crucial part of Radio Resource Management in LTE net works. Its main task is to accept or reject call request from the users, according to the availability of network resources, whilst maintaining the QoS of the ongoing calls. This thesis focuses in the study of preemption based call admission control algorithms in which the high priority call requests are served by preempting resources, partially or fully, from the lower priority active calls. The major concern of the work is the re source scarcity faced by lower priority bearers. This thesis, taking reference of existing priority scaled preemption algorithm, proposes a modified preemption algorithm which has the ability of preemption of resources partially, but never fully, from the higher priority active bearers to serve lower priority bearer requests. The proposed algorithm remarkably reduces the dropping and blocking of calls compared to existing preemption algorithms. The cost of this reduction appears as reduction in level of QoS provision to the higher priority calls. In addition, concept of Self Organizing Network is used to incorporate a self optimizing technique in the proposed modified algorithm to propose a new self optimizing preemption-based call admission control algorithm. The SON algorithm, incorporated in the thesis work, adjusts the level of minimum QoS ensured during partial preemption and allows preemption from higher priority calls only in predetermined conditions, taking GoS performance, Traffic Loss Ratio and call arrival pattern into consideration. The performance of both the modified and self optimizing algorithms are investigated in terms of call blocking and dropping and the level of QoS provision to the higher priority calls. The simulation results show that the modified algorithm reduces call blocking and dropping at the cost of reduction of level of QoS provision to the higher priority calls whereas the self optimizing preemption-based call admission control algorithm optimizes the performance, both in terms of blocking and dropping of lower priority calls as well as level of QoS provision to higher priority calls. |
| Year | 2013 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi Mohiuddin; |
| Examination Committee(s) | Poompat Saengudomlert;Attaphongse Taparugssanagorn; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2013 |