Publications @InProceedings{GriMarMasPIMRC97, AUTHOR = {Grimaldi, Annarita and Marano, Salvatore and Mastroianni, Carlo and Scarpelli, Maria Teresa}, TITLE = {A macro-microcellular system with mobile user speed estimation}, YEAR = {1997}, MONTH = {September}, BOOKTITLE = {Proc. of the 8th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC '97}, PAGES = {381--385}, ADDRESS = {Helsinki, Finland}, PUBLISHER = {IEEE}, URL = {http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=630949}, ABSTRACT = {Future cellular systems are expected to use differently sized and shaped cells, depending on the area to be covered (urban or rural) and the user density. This paper proposes a cellular system that uses a two-tier cellular scheme, with macrocells and microcells. Mobile users are grouped into two classes, “slow” and “fast” users: to estimate user speed, a procedure is implemented, based on the evaluation of the amount of time a mobile station resides in a microcell. A channel assignment strategy, which tries to allocate “slow” users to the low tier (microcells) and “fast” users to the high tier (macrocells), is proposed: in this way, low mobility users undergo handovers at microcell boundaries, and high mobility users undergo handovers at macrocell boundaries. A simulation study is carried out to show that the handover rate, as well as the system signaling load, are kept at an acceptable level}, NOTE = {ISBN 0-7803-3871-5} }