CA2134901A1 - A cdma communications method and system - Google Patents

A cdma communications method and system

Info

Publication number
CA2134901A1
CA2134901A1 CA002134901A CA2134901A CA2134901A1 CA 2134901 A1 CA2134901 A1 CA 2134901A1 CA 002134901 A CA002134901 A CA 002134901A CA 2134901 A CA2134901 A CA 2134901A CA 2134901 A1 CA2134901 A1 CA 2134901A1
Authority
CA
Canada
Prior art keywords
transmission rate
kbps
transmitted
rate
data
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
CA002134901A
Other languages
French (fr)
Other versions
CA2134901C (en
Inventor
Fumiyuki Adachi
Mamoru Sawahashi
Tomohiro Dohi
Shinji Uebayashi
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.)
NTT Docomo Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2134901A1 publication Critical patent/CA2134901A1/en
Application granted granted Critical
Publication of CA2134901C publication Critical patent/CA2134901C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/264—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for data rate control

Abstract

A CDMA communications method capable of multiplex transmission of data over a wide range from a low rate to high rate such as image data without a considerable increase in a circuit scale. A fundamental transmission rate is determined, for example, at 32 kbps, a rate higher than 8 kbps conventionally used. The data whose transmission rate is equal to the fundamental transmission rate is transmitted in frames including no vacant portion. Data whose transmission rate is lower than the fundamental transmission rate (16 kbps, for example) are transmitted in frames including vacant portions. The vacant portions are not transmitted. This makes it possible to receive data through other channels during a time period associated with the vacant portions. Data of a higher transmission rate, 128 kbps, for example, can be multiplexed and transmitted through four channels using different spreading codes.
CA 2134901 1993-11-08 1994-11-02 A cdma communications method and system Expired - Lifetime CA2134901C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP27852393 1993-11-08
JP278523/1993 1993-11-08
JP55585/1994 1994-03-25
JP5558594 1994-03-25
JP26060194A JP3003839B2 (en) 1993-11-08 1994-10-25 CDMA communication method and apparatus
JP260601/1994 1994-10-25

Publications (2)

Publication Number Publication Date
CA2134901A1 true CA2134901A1 (en) 1995-05-09
CA2134901C CA2134901C (en) 2002-03-26

Family

ID=27295636

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2134901 Expired - Lifetime CA2134901C (en) 1993-11-08 1994-11-02 A cdma communications method and system

Country Status (7)

Country Link
US (2) US5586113A (en)
EP (1) EP0652650B1 (en)
JP (1) JP3003839B2 (en)
KR (1) KR0131036B1 (en)
CN (1) CN1080965C (en)
CA (1) CA2134901C (en)
DE (1) DE69429497T2 (en)

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Also Published As

Publication number Publication date
JPH07312783A (en) 1995-11-28
US5734648A (en) 1998-03-31
EP0652650A3 (en) 1995-07-26
JP3003839B2 (en) 2000-01-31
DE69429497D1 (en) 2002-01-31
CN1080965C (en) 2002-03-13
CN1113369A (en) 1995-12-13
US5586113A (en) 1996-12-17
EP0652650B1 (en) 2001-12-19
CA2134901C (en) 2002-03-26
DE69429497T2 (en) 2002-06-27
EP0652650A2 (en) 1995-05-10
KR0131036B1 (en) 1998-04-21

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Effective date: 20141103

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Effective date: 20141103