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GSM frequency bands

About: GSM frequency bands is a research topic. Over the lifetime, 559 publications have been published within this topic receiving 5067 citations.


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Patent
01 Mar 2006
TL;DR: In this article, a method of freely switching over double mode mobile phone DMM includes setting one card with double numbers of WLAN or GSM network in DMM starting register on WLAN network when detected by DMM working under GSM mode, leaving GSM and entering WiFi mode by DM if register is successful, or otherwise working under gSM mode continuously ; on the contrary, starting registration on GSM Network when connection rate of DMM to WLAN Network is detected by AP connected with DM working under WiFi mode, leaving WiFi mode and entering GSM Mode by D
Abstract: A method of freely switching over double mode mobile phone DMM includes setting one card with double numbers of WLAN network or GSM network in DMM starting register on WLAN network when WLAN network is detected by DMM working under GSM mode , leaving GSM network and entering WiFi mode by DMM if register is successful , or otherwise working under GSM mode continuously ; on the contrary , starting register on GSM network when connection rate of DMM to WLAN network iœ 50 % is detected out by AP connected with DMM working under WiFi mode , leaving WiFi mode and entering GSM mode by DMM if register is successful , or otherwise working under WiFi mode continuously .

10 citations

Journal ArticleDOI
Paolo Cusinato1
TL;DR: In this paper, the analog power amplifier (PA) control loop of a fully integrated GSM/GPRS quad-band transceiver, suitable for GSM 850, GSM 900, DCS 1800, PCS 1900, and GPRS class 12 applications is presented.
Abstract: The analog power amplifier (PA) control loop of a fully integrated GSM/GPRS quad-band transceiver, suitable for GSM 850, GSM 900, DCS 1800, PCS 1900, and GPRS class 12 applications is presented. The control loop is based on a fully integrated PA controller (PAC) which meets applicable 3GPP GSM/GPRS specifications. Both the gain and the bandwidth of the PA control loop are programmable as well as the standby voltage delivered to the external PA: these features, together with a high driving capability (8.4 mA at 2.5 V), make this solution capable of interfacing many combinations of PAs, couplers, and detectors. The PAC has been integrated in a BiCMOS SiGe 0.35-/spl mu/m process and measures 0.33 mm/sup 2/. The current consumption from a single 2.8-V power supply is 2.8 mA without load and 7.2 mA in the application using Hitachi's PF08109B PA.

10 citations

Journal Article
TL;DR: It is found that the SAR in the head is reduced significantly for both the lower and upper global systems for mobile (GSM) frequency band.
Abstract: In this paper, a new design of cell phone body is presented to reduce the specific absorption rate (SAR) in the human head. The SAR in the human head and total absorbed power by the cell phone user are calculated along with antenna performances in terms of radiation efficiency and directivity to validate the effects of cell phone body. It is found that the SAR in the head is reduced significantly for both the lower and upper global systems for mobile (GSM) frequency band. The new mobile body provides 63.8% reduction in the SAR at 900 MHz and 69.2% reduction at 1800 MHz in comparison of without mobile cover configuration. Moreover, the mobile casing improves the radiation efficiency 6% and 7% in the lower and the upper GSM frequency band respectively.

10 citations

Journal ArticleDOI
TL;DR: A step by step process to design IUO in order to optimize the gain is proposed and it is found that for some cases it is better to utilize the advantages from FH rather than IUO when these features are combined.
Abstract: Intelligent Underlay Overlay (IUO) scheme is one of the most cost effective solution for capacity enhancement of Global System for Mobile Communication (GSM) However, the overall gain from this type of complex architecture depends on how efficiently it is designed and available radio resources are utilized This paper proposes a step by step process to design IUO in order to optimize the gain Here, the network configurations are determined analytically and a traffic model is developed to estimate the traffic distribution among different layers of IUO cell Equations for frequency reuse in each layer are derived and Frequency Hopping (FH), Power Control (PC) and Discontinuous Transmission (DTX) are integrated Effect of various parameters on cluster sizes is studied It is found that for some cases it is better to utilize the advantages from FH rather than IUO when these features are combined Several factors are taken into consideration during design phase like co-channel cells, super area coverage, traffic distribution, ratio and speed of moving vehicles, blocking probability intended by operator etc Finally an IUO cell is designed which shows 4142% capacity enhancement over normal cells having similar features and resources

10 citations

01 Jan 2009
TL;DR: In this paper, the authors explore the possibility of exploiting underutilized channels in the GSM bands, where the secondary users are the nodes of an overlay cognitive ad-hoc network, which opportunistically transmits in data channels left unused by the primary system.
Abstract: In this paper we explore the possibility of exploiting underutilized channels in the GSM bands. The secondary (unlicensed) users of the spectrum are the nodes of an overlay cognitive ad-hoc network, which opportunistically transmits in data channels left unused by the primary (licensed) system. The fundamental constraints for the secondary system are: 1) it uses the time slots/frequency channels (i.e. data channels) unused by the primary GSM system, 2) its operation does not degrade the performances of the primary system, 3) there is no exchange of signalling information between the primary and the secondary system to facilitate the secondary usage of spectrum, that is, the primary users are not cognitive aware. The focus is on the feasibility of the proposed approach, so that we consider a system level simulator based on a realistic GSM network deployed in the city of Bologna. In this context we evaluate the impact that the operation of the secondary users has on the performances of the primary system. In addition, we study the performances that can be obtained by the secondary system under the condition of marginal interference to the primary system. We will show that an appropriate choice of the frequency channel, makes the secondary usage of spectrum a valid approach to increase the operator's spectrum efficiency.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
202111
202015
201924
201828
201734