公开(公告)号：FI961444A0

公开(公告)日：1996-03-29

申请号：FI961444

申请日：1996-03-29

Applicant: INTERDIGITAL TECH CORP

Inventor： COOLEY DAVID M ,  KAEWELL JOHN D ,  LEMMO MARK A ,  VESSAL DAVID ,  DIGIOVANNI JOSEPH J ,  KURTZ SCOTT D ,  REGENSBURG MICHAEL W ,  JOHNS ERIC

IPC: H04B1/16 ,  H04J3/00 ,  H04B7/24 ,  H04B7/26 ,  H04J3/06 ,  H04L5/26 ,  H04Q1/00 ,  H04W4/18 ,  H04W48/08 ,  H04W52/02 ,  H04W56/00 ,  H04W72/02 ,  H04W72/04 ,  H04W72/12 ,  H04W74/00 ,  H04W74/04 ,  H04W84/14 ,  H04W88/00 ,  H04W88/02 ,  H04W88/08 ,  H04W99/00 ,  H04Q

Abstract: The present invention provides a method of minimizing synchronization delay in a radiotelephone system between a modular subscriber cluster communicating with a common base station, the modular subscriber cluster receiving repetitive time slots from the base station and having a plurality of frequency-agile modems, the method comprising the steps of: synchronizing a selected one of the modems to a selected time slot of the received time slots; generating a frame sync signal from said selected modem; and distributing said frame sync signal to remaining ones of the plurality of modems.

公开(公告)号：CA2172972A1

公开(公告)日：1995-04-06

申请号：CA2172972

申请日：1994-07-21

Applicant: INTERDIGITAL TECH CORP

Inventor： COOLEY DAVID M ,  DIGIOVANNI JOSEPH J ,  KAEWELL JOHN D ,  KURTZ SCOTT D ,  LEMMO MARK A ,  REGENSBURG MICHAEL W ,  VESSAL DAVID ,  JOHNS ERIC

IPC: H04J3/00 ,  H04B1/16 ,  H04B7/24 ,  H04B7/26 ,  H04J3/06 ,  H04L5/26 ,  H04Q1/00 ,  H04W4/18 ,  H04W48/08 ,  H04W52/02 ,  H04W56/00 ,  H04W72/02 ,  H04W72/04 ,  H04W72/12 ,  H04W74/00 ,  H04W74/04 ,  H04W84/14 ,  H04W88/00 ,  H04W88/02 ,  H04W88/08 ,  H04W99/00 ,  H04Q7/22 ,  H04M11/06

Abstract: A power-conserving time division multiple access (TDMA) radiotelephone syste m is disclosed in which a cluster of subscriber stations , remote from a base station, employs a common pool of frequency-agile modems each of which digitally synthesizes, on a time slot-by-t ime slot basis, the different channel-identifying intermediate needed to support communications between several of the subscriber stations and the base station. Power conservation is facilitated inter alia by controlling the assignment of modems to calls, mainta ining unassigned modems in a powered-down state and by controlling the number of c alls using the same time slot. Delay in assigning a powered-down modem to a call is eliminated by making available to all modems the highest quality synchronization information obtaine d by any of the active modems.