<p> </p><p>Mobile users need more capacity and higher velocity to work with new data applications. In </p><p>order to satisfy these requirements, mobile systems of third generation were created and they </p><p>are established every day in more places. Consequently second and third generation of system </p><p>have to coexist. </p><p>In this paper is presented a study about the co-existence between GSM and UMTS, the most </p><p>popular systems in Europe. 900MHz is the frequency chosen to work with both systems, due to </p><p>this low frequency allows: less path loss and more coverage, than 2100MHz the usual </p><p>frequency for UMTS system. </p><p>The situation evaluated is focused on introducing a UMTS carrier in a GSM operator, with the </p><p>aim to determine the advantages and cons produced in the mobiles with this change. Two </p><p>cases are distinguished: coordinated operation, GSM and UMTS900 in the same operator and </p><p>un-coordinated operation, UMTS900 respect to other GSM operator. Users under study belong </p><p>to both modified operator and a next GSM operator. Power control was programmed in both </p><p>systems. </p><p>It was determined how affect the interferences in system capacity of the operators and which </p><p>is the guard band necessary to protect the system. Spectral efficiency (user/cluster/MHz) in </p><p>the case GSM and UMTS900 in same band is twice as much as in a GSM operator. The </p><p>separation between operators is set in 300KHz.But is important to know that UMTS carriers do </p><p>not cause damage in others operators because is located in the middle of GSM carriers. The </p><p>guard band fixed to protect each mobile in operator with shared spectrum is not necessary. </p><p>The distance between carriers GSM and UMTS necessary is 2.4MHz while the width of one </p><p>UMTS carrier is 2.5MHz. </p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:hig-6801 |
| Date | January 2010 |
| Creators | Cutillas Sanchez, Laura |
| Publisher | University of Gävle, Department of Electronics, Mathematics and Natural Sciences |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, text |
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