DL - 4G Americas

APPENDIX C: TARGET REQUIREMENTS FOR IMT‐ADVANCED
C.1 TARGET REQUIREMENTS FOR IMT‐ADVANCED
As 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 are
mobile 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 services
including advanced mobile services, supported by mobile and fixed networks, which are
increasingly packet-based.”
The goal of the IMT-Advanced requirements is to provide the baseline requirements for consistent
definition, specification, and evaluation of the candidate Radio Interface Technologies (RITs) or Sets of
RITs (SRITs) for IMT-Advanced. These requirements will work in conjunction with the development of
Recommendations and Reports, such as the evaluation criteria 148 and the circular letter framework. 149
The requirements ensure that IMT-Advanced technologies are able to fulfill the objectives of IMT-
Advanced, and to set a specific level of minimum performance that each proposed technology needs to
achieve in order to be considered by ITU-R WP 5D for IMT-Advanced.
The requirements are not intended to restrict the full range of capabilities or performance that candidate
technologies for IMT-Advanced might achieve, nor are they designed to describe how the IMT-Advanced
technologies might perform in actual deployments under operating conditions that could be different from
those presented in ITU-R Recommendations and Reports on IMT-Advanced.
The requirements in this section are directly out of Report ITU-R M.2134.
C.1.1 CELL SPECTRAL EFFICIENCY
Cell spectral efficiency 150 (�) is defined as the aggregate throughput of all users – the number of correctly
received bits (i.e. the number of bits contained in the SDUs delivered to Layer 3, over a certain period of
time) – divided by the channel bandwidth divided by the number of cells. The channel bandwidth for this
purpose is defined as the effective bandwidth times the frequency reuse factor, where the effective
bandwidth is the operating bandwidth normalized appropriately considering the uplink/downlink ratio.
The cell spectral efficiency is measured in b/s/Hz/cell.
148 Report ITU-R M.2135, Guidelines for evaluation of radio interface technologies for IMT-Advanced.
149 ITU-R Circular Letter 5/LCCE/2 (and Addendum 1), Further information on the invitation for submission of proposals for
candidate radio interface technologies for the terrestrial components of the radio interface(s) for IMT- Advanced and invitation to
participate in their subsequent evaluation.
150 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.4gamericas.org February 2011 Page 144