Optimization of LTE Network for Addis Ababa Light Railway
| dc.contributor.advisor | Beneyam, Berehanu (PhD) | |
| dc.contributor.author | Kefyalew, Biru | |
| dc.date.accessioned | 2021-11-23T07:41:52Z | |
| dc.date.accessioned | 2023-11-04T15:17:30Z | |
| dc.date.available | 2021-11-23T07:41:52Z | |
| dc.date.available | 2023-11-04T15:17:30Z | |
| dc.date.issued | 2019-10 | |
| dc.description.abstract | To meet railway communication demand, conventional railway mobile communication systems including Global System for Mobile Communication-Railway and Terrestrial Trunked Radio have been challenged in terms of capacity, coverage and quality. To address the capacity, coverage and quality challenges, Long Term Evolution (LTE) has been emerged as an alternative important wireless technology for railway. Addis Ababa Light Rail Transit Service (AALRTS) has been operational since September 2015 serving an average of 130,000 users daily with its two lines extended from east to west (Line 1) and north to south (Line 2) of Addis Ababa. To AALRTS communication demand, LTE network has been planned and deployed at 400 MHz carrier frequency. The network consists of 4 sites of 9 LTE cells operating with 3MHz bandwidth and planned antenna and other configurations. Although the network provides quality service for current rail voice/data service in most parts of both rail lines, there are coverage challenge in some parts of the lines and it needs to be enhanced for the increasing multimedia service demand. The objective of this thesis is to quantitatively articulate aforementioned coverage challenge of the LTE network for AALRTS and then to perform optimization campaign to address the challenge. To articulate the coverage challenge, data is collected using drive test around challenged parts of the rail lines beside data obtained from management system of the network. Drive test is undertaken using Huawei EP680 LTE terminal and obtained data is analyzed using Matlab. Optimization is performed for antenna parameters of existing network cells and location of a newly added cell using search method from potential values. For the optimization, network simulation is performed using Win- Prop network simulation tool and for propagation computation deterministic dominant path model is applied. For performance analysis, signal-to-interference-plus-noise-ratio (SINR) is used as a key metric. Drive test result shows that 17% and 6% parts of Lines 1 and 2 SINR results are less than 7dB, respectively. Independent and combined antenna height and power optimization provides significant coverage improvement while antenna tilt and azimuth optimization present negligible performance gains. Furthermore, adding a new LTE cell and optimizing its location presents excellent SINR improvement. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/28892 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | LTE | en_US |
| dc.subject | Railway | en_US |
| dc.subject | Coverage | en_US |
| dc.subject | Capacity | en_US |
| dc.subject | Quality | en_US |
| dc.subject | Optimization | en_US |
| dc.subject | Drive Test | en_US |
| dc.subject | Antenna Parameters | en_US |
| dc.title | Optimization of LTE Network for Addis Ababa Light Railway | en_US |
| dc.type | Thesis | en_US |