UMTS: Alive and Well - 4G Americas

7.3.1 ITU-R PUBLICATIONSITU-R publications are available at :• ITU-R “M” Series Recommendations: http://www.itu.int/rec/R-REC-M/e• ITU-R “M” Series Reports: http://www.itu.int/publ/R-REP-M/en7.4 TARGET REQUIREMENTS FOR IMT-ADVANCEDAs defined in Report ITU-R M.2134 Requirements Related to Technical Performance for IMT-Advanced Radio Interface(s):“International Mobile Telecommunications-Advanced (IMT-Advanced) systems aremobile systems that include the new capabilities of IMT that go beyond those of IMT-2000. Such systems provide access to a wide range of telecommunication servicesincluding advanced mobile services, supported by mobile and fixed networks, which areincreasingly packet-based.”The goal of the IMT-Advanced requirements is to provide the baseline requirements forconsistent definition, specification, and evaluation of the candidate Radio Interface Technologies(RITs) or Sets of RITs (SRITs) for IMT-Advanced. These requirements will work in conjunctionwith the development of Recommendations and Reports, such as the evaluation criteria 120 andthe circular letter framework. 121 The requirements ensure that IMT-Advanced technologies areable to fulfill the objectives of IMT-Advanced, and to set a specific level of minimum performancethat each proposed technology needs to achieve in order to be considered by ITU-R WP 5D forIMT-Advanced.The requirements are not intended to restrict the full range of capabilities or performance thatcandidate technologies for IMT-Advanced might achieve, nor are they designed to describe howthe IMT-Advanced technologies might perform in actual deployments under operating conditionsthat could be different from those presented in ITU-R Recommendations and Reports onIMT-Advanced.The requirements in this section are directly out of Report ITU-R M.2134.7.4.1 CELL SPECTRAL EFFICIENCYCell spectral efficiency 122 (η) is defined as the aggregate throughput of all users – the number ofcorrectly received bits (i.e. the number of bits contained in the SDUs delivered to Layer 3, over acertain period of time) – divided by the channel bandwidth divided by the number of cells. Thechannel bandwidth for this purpose is defined as the effective bandwidth times the frequency120 Report ITU-R M.2135, Guidelines for evaluation of radio interface technologies for IMT-Advanced.121 ITU-R Circular Letter 5/LCCE/2 (and Addendum 1), Further information on the invitation for submission of proposals forcandidate radio interface technologies for the terrestrial components of the radio interface(s) for IMT- Advanced andinvitation to participate in their subsequent evaluation.122 For the purposes of the IMT-Advanced requirements, a cell is equivalent to a sector, e.g. a 3-sector site has 3 cells.www.3GAmericas.org February 2010 Page 79