CA2066539A1 - Adaptive synchronization arrangement - Google Patents

Adaptive synchronization arrangement

Info

Publication number
CA2066539A1
CA2066539A1 CA2066539A CA2066539A CA2066539A1 CA 2066539 A1 CA2066539 A1 CA 2066539A1 CA 2066539 A CA2066539 A CA 2066539A CA 2066539 A CA2066539 A CA 2066539A CA 2066539 A1 CA2066539 A1 CA 2066539A1
Authority
CA
Canada
Prior art keywords
telephone system
synchronized
switching systems
communications
telephone
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
CA2066539A
Other languages
French (fr)
Other versions
CA2066539C (en
Inventor
Charles Yeomans Farwell
Michael Lee Hearn
Richard Michael Heidebrecht
Kelvin Ki-Yui Ho
Douglas Albert Spencer
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.)
HIGH POINT SARL
Original Assignee
American Telephone and Telegraph Co Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24922886&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2066539(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2066539A1 publication Critical patent/CA2066539A1/en
Application granted granted Critical
Publication of CA2066539C publication Critical patent/CA2066539C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0664—Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0673—Clock or time synchronisation among packet nodes using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks

Abstract

A CDMA cellular radio-telephone system (FIG. 2) has switching systems (201) synchronized to public telephone network (100) timing signals (600), and radio telephones (203) and cell base stations (202) synchronized to a different clock (1000). Transmission delays between the cell base stations and the telephone network are variable. Switching systems include digital communications interfaces (264) to the telephone system, whose connections to the telephone system are synchronized to the telephone system, and whose connections to the cells arenominally also synchronized to the telephone system but whose processor (602) operates for each call within predefined windows (1302, 1402) of phase relationships to the operation of the cell that is handling the call, and occasionally adjusts(FIGS. 13-16) its phase relationships to the operation of the telephone system to achieve and maintain its operation within the predefined windows. Packet-switched communications (350) between the cells and the switching systems absorb the phase relationship fluctuations and the timing adjustments in inter-packet intervals.
Circuit-switched digital communications between the switching systems and the telephone system absorb the timing adjustments by means of vocoder (604)-implemented slips --bit insertions or deletions-- in the communications traffic bit stream.
CA002066539A 1991-07-09 1992-04-21 Adaptive synchronization arrangement Expired - Lifetime CA2066539C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US727,491 1985-04-26
US07/727,491 US5184347A (en) 1991-07-09 1991-07-09 Adaptive synchronization arrangement

Publications (2)

Publication Number Publication Date
CA2066539A1 true CA2066539A1 (en) 1993-01-10
CA2066539C CA2066539C (en) 1997-12-23

Family

ID=24922886

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002066539A Expired - Lifetime CA2066539C (en) 1991-07-09 1992-04-21 Adaptive synchronization arrangement

Country Status (8)

Country Link
US (1) US5184347A (en)
EP (1) EP0522775B1 (en)
JP (1) JPH07105785B2 (en)
CA (1) CA2066539C (en)
DE (1) DE69215774T2 (en)
ES (1) ES2095409T3 (en)
HK (1) HK45797A (en)
SG (1) SG44465A1 (en)

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Also Published As

Publication number Publication date
DE69215774T2 (en) 1997-04-03
JPH06252908A (en) 1994-09-09
ES2095409T3 (en) 1997-02-16
CA2066539C (en) 1997-12-23
DE69215774D1 (en) 1997-01-23
EP0522775B1 (en) 1996-12-11
HK45797A (en) 1997-04-18
SG44465A1 (en) 1997-12-19
US5184347A (en) 1993-02-02
ES9195409T3 (en) 1997-02-16
JPH07105785B2 (en) 1995-11-13
EP0522775A3 (en) 1993-10-20
EP0522775A2 (en) 1993-01-13

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