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5: Evolution of Mobile Devices and Opera... > 5.6 Multimode, Multifrequency Termin...

5.6 Multimode, Multifrequency Terminals

While in the past only a few frequency bands were used for cellular wireless systems, their number is now rising rapidly. Table 5.1 shows the bands currently assigned in different parts of the world for 3GPP B3G networks for GSM/UMTS/HSPA and LTE terminals based on [23]. Table 5.2 shows current and future frequency ranges for WiMAX based on [24].

In practice, the growing number of bands has a number of undesired implications for both users and network operators. Typically, even sophisticated mobile devices today support only one or two 3G frequency bands like, for example, the 2100 MHz band for European models or 850/1900 MHz for US models. In addition, such high-end phones usually also support four bands for 2.5G GSM/GPRS, that is, 900 and 1800 MHz for Europe and 850 and 1900 MHz for the US. Data cards and B3G USB adapters are slightly ahead and usually support the 2100, 1900 and 850 MHz bands. Mobile phones are also moving in this direction, with Sony Ericsson having been the first company to offer such a Tri-Band B3G + Quadband 2.5G band model [26]. While connectivity with such ....


  

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