High speed uplink packet access (HSUPA) capacity analysis for universal mobile telecommunications system (UMTS) | |
| Author | Pradhan, Nuraj Lal |
| Call Number | AIT Thesis no.TC-06-03 |
| Subject(s) | Mobile communication systems Simulation methods Code division multiple access Simulation methods |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-06-03 |
| Abstract | The improved spectral efficiency provided by High Speed Downlink Packet Access (HSDPA) has introduced new and more demanding services such as interactive gaming and video streaming. These multimedia services along with data, image, audio and video transfers have seriously highlighted the limitation of uplink capacity. To address this issue, High Speed Uplink Packet Access (HSUPA) also known as Enhanced Uplink is introduced in Release 6 of Third Generation Partnership Project (3GPP) standardization. HSUPA uses techniques similar to that used in HSDPA. One of the basic techniques used in HSUPA is Node B packet scheduling. Packet scheduling in I-ISDPA has been widely researched in the literature. However due to the fundamental difference in power management in the uplink and downlink, packet scheduling in HSUPA is quite different from that in HSDPA. In this thesis, performance of different packet scheduling techniques for HSUPA is evaluated through simulations. The results show that the cell capacity can be increased by using technique which reduces the interference. Time scheduling outperforms rate scheduling. The improvement increases as the number of users scheduled in parallel decreases. However pure time scheduling as in HSDPA is not possible as the maximum achievable data rates are limited by the User Equipment (UE) capabilities, cell loading and interference. The performance can be further improved by scheduling the users according to their channel conditions. Different scheduling techniques utilizing this multi-user diversity is evaluated. The main requirement of the packet scheduling is to maximize the cell throughput and allocate resource fairly among the users in the cell. These two requirements however are contradictory and a trade off between the two is required in a practical scenario. The Fair Resource (FR) scheduler gave the least cell throughput as it did not utilize the channel state information of the users. The Prioritize Users with Best Supportable Transmission Rates (PUBSTR) scheduler best utilize this multi-user gain and the increase in the cell throughput is as much as 11% compared to FR scheduler. But the PUBSTR scheduler prioritized the users with good channel condition and neglected the users with bad channel condition. In other word, it has a serious fairness problem. The Fair Channel State (FCS) scheduler increased the cell capacity by as much as 6% while fairly allocating the resource among the users. Fast scheduling, which is one of the fundamental technique used in HSUPA, can therefore enhance the uplink performance of the Wideband Code Division Multiple Access (WCDMA) systems |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-06-03 |
| 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 M. ; |
| Examination Committee(s) | Rajatheva, R. M.A. P.;Erke, Tapio J.;Zeghlache, Djamal;Assaad, Mohamad ; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |