CA2157959A1 - Apparatus and Method for Obtaining Synchronism Between a Base Station and a Portable Unit Arranged for Operation in a Frequency Hopping System - Google Patents

Apparatus and Method for Obtaining Synchronism Between a Base Station and a Portable Unit Arranged for Operation in a Frequency Hopping System

Info

Publication number
CA2157959A1
CA2157959A1 CA2157959A CA2157959A CA2157959A1 CA 2157959 A1 CA2157959 A1 CA 2157959A1 CA 2157959 A CA2157959 A CA 2157959A CA 2157959 A CA2157959 A CA 2157959A CA 2157959 A1 CA2157959 A1 CA 2157959A1
Authority
CA
Canada
Prior art keywords
message
base unit
unit
hopping
handset
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2157959A
Other languages
French (fr)
Other versions
CA2157959C (en
Inventor
Herbert W. Tam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of CA2157959A1 publication Critical patent/CA2157959A1/en
Application granted granted Critical
Publication of CA2157959C publication Critical patent/CA2157959C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7156—Arrangements for sequence synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7156—Arrangements for sequence synchronisation
    • H04B2001/71563—Acquisition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A cordless telephone arranged for operation in a frequency hopping system quickly establishes communications between a base unit and an associated handset unit in the telephone. Synchronization between the base unit and the handset unit is achieved through a process in which first the base unit sends a start hopping message contiguously for a specific number of frames or time slots. The handset unit, in turn, responds by sending a start hopping acknowledge message to the base unit in a frame each time it receives the start hopping message in a frame.
In response to the handset unit sending the start hopping acknowledge message, the base unit sends to the handset unit an acknowledge hopping message, also for a specific number of frames. If either the base unit or handset unit fails to receive a message in a specific frame, the synchronization process advantageously continues since each one of the messages contained in the specific number of frames linearly decreases in value with each succeeding frame. Both the base unit and handset unit are thus able to predict the value for each message not received in one or more specific frames. Upon receipt of the acknowledge hopping message by the handset unit from the base unit in at least one frame, therefore, both the base unit and the handset unit are synchronized and will begin frequency hopping when the value for this message linearly decreases in time to a predetermined value. Should ongoingcommunications between the base unit and the handset unit be inadvertently interrupted, the cordless telephone quickly reestablishes communications in the frequency hopping system through this same synchronization process.
CA002157959A 1994-09-27 1995-09-11 Apparatus and method for obtaining synchronism between a base station and a portable unit arranged for operation in a frequency hopping system Expired - Fee Related CA2157959C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US312,595 1994-09-27
US08/312,595 US5568510A (en) 1994-09-27 1994-09-27 Apparatus and method for obtaining synchronism between a base station and a portable unit arranged for operation in a frequency hopping system

Publications (2)

Publication Number Publication Date
CA2157959A1 true CA2157959A1 (en) 1996-03-28
CA2157959C CA2157959C (en) 1998-12-08

Family

ID=23212178

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002157959A Expired - Fee Related CA2157959C (en) 1994-09-27 1995-09-11 Apparatus and method for obtaining synchronism between a base station and a portable unit arranged for operation in a frequency hopping system

Country Status (2)

Country Link
US (1) US5568510A (en)
CA (1) CA2157959C (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5809417A (en) * 1994-07-05 1998-09-15 Lucent Technologies Inc. Cordless telephone arranged for operating with multiple portable units in a frequency hopping system
KR0142949B1 (en) * 1995-06-16 1998-08-01 김광호 Initial synchronization
KR100217727B1 (en) 1997-06-25 1999-09-01 윤종용 Direct communication control method in mobile wireless communication system
US6434184B2 (en) * 1998-12-30 2002-08-13 International Business Machines Corporation Orthogonal frequency hopping using skip zones
US6751249B1 (en) 1999-09-24 2004-06-15 Agere Systems Inc. Received-signal-strength-based swap table for frequency hopping communication system
KR100613179B1 (en) * 2000-12-27 2006-08-17 한국전자통신연구원 Error Control Method for Frequency Hopping Synchronization
US7027418B2 (en) * 2001-01-25 2006-04-11 Bandspeed, Inc. Approach for selecting communications channels based on performance
US7119832B2 (en) * 2001-07-23 2006-10-10 L-3 Communications Mobile-Vision, Inc. Wireless microphone for use with an in-car video system
US7729776B2 (en) 2001-12-19 2010-06-01 Cardiac Pacemakers, Inc. Implantable medical device with two or more telemetry systems
US6993393B2 (en) 2001-12-19 2006-01-31 Cardiac Pacemakers, Inc. Telemetry duty cycle management system for an implantable medical device
US20030151663A1 (en) * 2002-01-23 2003-08-14 Mobile-Vision, Inc. Video storage and delay device for use with an in-car video system
US6985773B2 (en) 2002-02-07 2006-01-10 Cardiac Pacemakers, Inc. Methods and apparatuses for implantable medical device telemetry power management
US7254159B1 (en) * 2002-02-20 2007-08-07 Logitech Europe S.A. High-frequency wireless peripheral device with auto-connection and auto-synchronization
US8350907B1 (en) 2003-09-12 2013-01-08 L-3 Communications Mobile-Vision, Inc. Method of storing digital video captured by an in-car video system
US20050088521A1 (en) * 2003-10-22 2005-04-28 Mobile-Vision Inc. In-car video system using flash memory as a recording medium
US7023333B2 (en) * 2003-10-22 2006-04-04 L-3 Communications Mobile Vision, Inc. Automatic activation of an in-car video recorder using a vehicle speed sensor signal
WO2005099817A1 (en) 2004-04-07 2005-10-27 Cardiac Pacemakers, Inc. Rf wake-up of implantable medical device
US7539541B2 (en) * 2004-08-09 2009-05-26 Cardiac Pacemakers, Inc. Automatic power control for a radio frequency transceiver of an implantable device
US20060055521A1 (en) * 2004-09-15 2006-03-16 Mobile-Vision Inc. Automatic activation of an in-car video recorder using a GPS speed signal
US8899547B2 (en) * 2004-11-18 2014-12-02 Qspex Technologies, Inc. Molds and method of using the same for optical lenses
US7218969B2 (en) * 2005-01-19 2007-05-15 Cardiac Pacemakers, Inc. Dynamic channel selection for RF telemetry with implantable device
US7664553B2 (en) 2005-04-27 2010-02-16 Cardiac Pacemakers, Inc. System and method for enabling communications with implantable medical devices
US8185204B2 (en) 2006-07-12 2012-05-22 Cardiac Pacemakers, Inc. Implantable medical device telemetry with adaptive frequency hopping
US7623922B2 (en) * 2006-07-12 2009-11-24 Cardiac Pacemakers, Inc. Implantable medical device telemetry with periodic frequency hopping
US7769456B2 (en) * 2006-09-01 2010-08-03 Cardiac Pacemakers, Inc. Frequency-agile system for telemetry with implantable device
US8046079B2 (en) 2007-03-13 2011-10-25 Cardiac Pacemakers, Inc. Implantable medical device telemetry with hop-on-error frequency hopping
US8248989B2 (en) * 2008-11-05 2012-08-21 Electronics And Telecommunications Research Institute Wireless network system using cyclic frame
WO2017096518A1 (en) * 2015-12-08 2017-06-15 华为技术有限公司 Data transmission method, base station, and terminal device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353341A (en) * 1991-10-21 1994-10-04 At&T Bell Laboratories Cordless telephone arranged for operation in a frequency hopping system
US5353447A (en) * 1992-11-02 1994-10-11 B&S Plastics, Inc. Rotating hydrotherapy jet with adjustable offset outlet nozzle

Also Published As

Publication number Publication date
US5568510A (en) 1996-10-22
CA2157959C (en) 1998-12-08

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20090911