Performance evaluation of dynamic packet data channel reservation for GPRS | |
| Author | Parichat Chuetong |
| Call Number | AIT Thesis no.TC-02-21 |
| Subject(s) | Global system for mobile communications Data compression (Telecommunication) |
| 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-02-21 |
| Abstract | The Global System for Mobile Communication (GSM) is the world's most popular second-generation digital cellular system. The underlying technology of second-generation digital cellular system is circuit switching. For making the radio transmission more efficient, packet switching can be used in mobile radio system. The General Packet Radio Service (GPRS) that can support the bit rate up to 171.4 kbit/s is a new bearer service to support packet data transmission in GSM system. In this thesis work, the performance of GSM and GPRS system are studied through analysis and simulation. For analysis purpose, two dimensional Markov model is applied assuming that the arrival process is Poisson and service time is exponentially distributed. In simulation study the GPRS session size is modeled using truncated Pareto distribution. Three options of Packet Data Channels (PDCHs) reservation for GPRS traffic are considered: no PDCH, fixed two PDCHs and dynamic reservation (0 to 2 PDCHs). Maximum number of PDCHs with dynamic PDCHs reservation is limited to 4, 6 and 8. In three dynamic PDCHs reservation cases different GPRS data buffer occupation based hysteresis threshold levels are considered. The influence of the penetration of GPRS traffic from 10% to 50% with varying total load is studied. Increasing maximum number of PDCHs does not affect much the performance of GSM but it enhances GPRS performance. The dynamic PDCHs reservation can improve the GPRS performance while keeping the GSM performance compared to no PDCH. The case of normal load dynamic reservation with low threshold levels provides the best GPRS performance for all percentages of GPRS traffic in the system. In the high load system the results show that GPRS performance in all three dynamic PDCHs reservation cases are similar and better than in no reservation case. For 50% of GSM and 50% of GPRS traffic ratio, the study cases of low load system (GSM offered traffic, 12 Erl.) and high load system (GSM offered traffic, 24 Erl.) are referred here. In low load system, the dynamic PDCHs reservation is not necessary. Traffic load from GSM is not much so that there are sufficient channels for GPRS. While in high load system, the dynamic PDCHs reservation can improve GPRS session blocking probability 14% (units· of percentage). The mean throughput of GPRS is increased about 17% when compared to no reservation. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-02-21 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Erke, Tapio J. ; |
| Examination Committee(s) | Ahmed, Kazi M. ;Teerapat Sanguankotchakorn; |
| Scholarship Donor(s) | Advance Info Service Public Company Limited (AIS); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |