公开(公告)号：EP1260105A2

公开(公告)日：2002-11-27

申请号：EP01941446.5

申请日：2001-02-12

Applicant: MOTOROLA, INC.

Inventor： PHILLIPS, W., Garland ,  JORDAN, Larry, David ,  SOUISSI, Slim

IPC: H04Q7/20

CPC classification number: H04W48/18 ,  H04W8/183

Abstract: A wireless communication system measures (602) a traffic load of ones of a plurality of fixed communication stations (102, 202) and transmits (606) from at least one of the stations information describing a location of the at least one of the stations and locations of nearby other stations, along with traffic loads corresponding to the stations. A portable communication unit (104) within communication range of the station conveys (608) the information, thereby assisting the user of the portable communication unit to find a fixed communication station having sufficient capacity available for handling a desired communication.

公开(公告)号：EP1018245A1

公开(公告)日：2000-07-12

申请号：EP98943495.6

申请日：1998-08-31

Applicant: MOTOROLA, INC.

Inventor： DEHNER, Leo, G. ,  SOUISSI, Slim

IPC: H04L12/43

CPC classification number: H04H20/67 ,  H04L7/027 ,  H04L7/06 ,  H04W4/12 ,  H04W56/0075 ,  H04W74/04 ,  H04W76/10 ,  H04W88/022

Abstract: A digital sync signal (502) is transmitted (702) from K transmitters (206) of a cluster (402), followed by K fine tuning signals (506) during K time slots (510), each time slot assigned to a transmitter. Each fine tuning signal comprises a pair of tones (512) separated in frequency by a predetermined amount. A portable subscriber unit (122) receives (706) the sync signal and the fine tuning signals, and makes (708) a rough estimate of the beginning of the fine tuning signals from the sync signal and from knowledge about the time slots. The portable subscriber unit computes (710) for each time slot a 2M-point Fourier transform (FT) on a received signal including M fine tuning signals received during the time slot from a transmitter of the cluster and from M-1 corresponding transmitters of adjacent clusters (404). The portable subscriber unit then fine tunes (722) the rough estimate through FT calculations.