caa a22 4500 463195191 CHVBK 20180406164920.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10669-007-9056-1 doi (NATIONALLICENCE)springer-10.1007/s10669-007-9056-1 An investigation of the effects from the user's hand and head over received level and adaptive power control of a GSM mobile phone in typical operating environment [Elektronische Daten] [Nikolay Atanasov, Gabriela Atanasova] Current evolution of wireless personal communications has necessitated a comprehensive understanding of electromagnetic interactions between handset antennas and nearby human body. In this work the handset-human body interactions were evaluated in various configurations (with and without user's hand; with and without user's head, and combinations of them) in order to obtain statistical averages of the overall performance for system link evaluations. The measurements were performed using the random-field measurement (RFM) method, and thus the acquisition of large amounts of data about human-mobile phone interactions in typical operating environment with measured the received RF signal strength (RXLEV), and the output power level (TXLEV) on mobile station. The RXLEV and the TXLEV was measured over the air interface in the networks on two Bulgarian GSM mobile operators (Mtel and Vivatel). Both uplink and downlink measurements were performed in urban area in three cities. Each measurements were carried out in a building included both line-of-sight and non-line-of-sight propagation of the electromagnetic waves between mobile station and base station. The results showed that the user's hand and head induces more significant changes on the received RF signal strength in case when broadcast control channel (BCCH) levels are up to −60dBm. Also the alterations of receiving RF signal strength and output power level of the MS are influence stronger from the larger size of the hand and head of user. The influence from presence of the head and hand of the subscriber in talk position over the alteration of the receiving RF signal strength is in boundaries from 14.21dBm to 19.1dBm (man) and from 8.5dBm to 12.05dBm (woman). The presence of the user's hand and head increased the output power level of mobile station with 12dBm to 14dBm (man) and with 10dBm to 12dBm (woman) compare to output power level without user's hand and head. Springer Science+Business Media, LLC, 2007 Power control nationallicence Received level nationallicence GSM mobile phone nationallicence Handset-human body interactions nationallicence Typical operating environment nationallicence Atanasov Nikolay Department of Wireless Communications and Broadcasting, Higher College of Telecommunications and Posts, 1 "Acad. Stefan Mladenov” Str., 1700, Sofia, Bulgaria aut Atanasova Gabriela Department of Telecommunication Technologies, Higher College of Telecommunications and Posts, 1 "Acad. Stefan Mladenov” Str., 1700, Sofia, Bulgaria aut The Environmentalist Springer US; http://www.springer-ny.com 27/4(2007-12-01), 585-591 0251-1088 27:4<585 2007 27 10669 https://doi.org/10.1007/s10669-007-9056-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10669-007-9056-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Atanasov Nikolay Department of Wireless Communications and Broadcasting, Higher College of Telecommunications and Posts, 1 "Acad. Stefan Mladenov” Str., 1700, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Atanasova Gabriela Department of Telecommunication Technologies, Higher College of Telecommunications and Posts, 1 "Acad. Stefan Mladenov” Str., 1700, Sofia, Bulgaria aut NATIONALLICENCE 773 0- The Environmentalist Springer US; http://www.springer-ny.com 27/4(2007-12-01), 585-591 0251-1088 27:4<585 2007 27 10669 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer