EP0668664B1
Expired / Lapsed
EP
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CDMA/TDD radio communication system
Assignee: Panasonic Holdings Corp
•
Filing: 1995-01-16
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Granted: 1999-10-13
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Expires: 2015-01-16
Abstract
No abstract record available.
Inventors
- 👤 Takayuki Nakano
- 👤 Kazuyuki Miya
- 👤 Osamu Hiyoshi Nichimo Daigo Koporasu Kato
- 👤 Masatoshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 11:36
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/32; H04W52/325; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2618; H04B7/2628; H04B7/2637; H04W52/06; H04W52/10; H04W52/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
210 words
A CDMA radio communication system comprising a base station (100, 1100)
and one or more mobile units (200, 1200), wherein said base station (100, 1100) comprises: pilot signal generating (15, 115) for generating a pilot signal (26, 131) that has
a constant transmission power level for transmission to said mobile units (200,
1200); and pilot signal transmitting means (16, 116) for transmitting said pilot signal (26,
131) in a bursting manner through at least one spread channel (5); and each of said mobile units (200, 1200) comprises: pilot signal level measuring means (19, 119) for measuring the reception
power of said pilot signal (26, 131); and transmission power control means (8) for controlling a transmission power
based on the measured reception power of said pilot signal (26, 131), characterized in that said communication system being a time division duplex TDD system in
which transmission and reception are performed in the same frequency band, that each of said mobile units (200, 1200) further comprises data quality
measuring means (20, 120) for measuring the quality of a received data; and that said transmission power control means (8) controls the transmission
power based on output signals of said pilot signal level measuring means (19,
119) and said data quality measuring means (20, 120).
Claim 2
Dependent Claim
44 words
The communication system according to claim 1, characterized in that each
of said mobile units (200, 1200) further comprises synchronization acquisition
means (21, 121) for acquiring synchronization information on spread codes
using the pilot signal (26, 131) transmitted from said base station (100, 1100).
Claim 3
Dependent Claim
46 words
The communication system according to claim 1 or 2, characterized in that each of said mobile units (200, 1200) further comprises synchronization
storage means (22, 122) for storing synchronization information on spread
codes using the pilot signal (26, 131) transmitted from said base station (100,
1100).
Claim 4
Dependent Claim
70 words
The communication system according to any one of claims 1 to 3, characterized in that each of said mobile units (200, 1200) further
comprises: phase detecting means (23, 123) for obtaining a phase of a carrier wave using the
pilot signal (26, 131) transmitted from said base station (100, 1100); and despreading means (6) for demodulating data in accordance with an output signal
of said phase detecting means (23, 123).
Claim 5
Dependent Claim
94 words
The communication system according to any one of claims 1 to 4, characterized
in that each of mobile units (200, 1200) further comprises: frequency offset detecting means (24, 124) for obtaining an offset of a carrier
frequency in a local oscillator of said mobile unit (200, 1200) based on the pilot
signal (26, 131) transmitted from said base station (100, 1100); and frequency adjusting means (25, 125) for adjusting frequency of the local
oscillator of said mobile unit (200, 1200) in accordance with an output signal of
said frequency offset detecting means (24, 124).
Claim 6
Dependent Claim
58 words
The communication system according to any one of claims 1 to 5, characterized
in that said base station (100, 1100) further comprises pilot signal transmission
level setting means (17, 117) for setting the transmission power of the pilot signal
(26, 131), which is to be transmitted, larger than the transmission power of a
signal of another spread channel.
Claim 7
Dependent Claim
73 words
The communication system according to any one of claims 1 to 6, characterized
in that : each of said mobile units (200, 1200) further comprises data signal level
measuring means (7) for measuring the reception power of a data signal
transmitted to said mobile unit (200, 1200); and said transmission power control means (8) controls the transmission power
additionally on the basis of output signals of said data signal level measuring
means (7).
Claim 8
Dependent Claim
97 words
The communication system according to any one of claims 1 to 7, characterized
in that : said base station (1100) further comprises single tone transmission means for
transmitting a single tone (132) having a constant transmission power level and a
signal frequency to said mobile units (1200); each of said mobile units (1200) further comprises single tone level measuring
means (128) for measuring a reception power of said single tone (132); and said transmission power control means (8) controls the transmission power
additionally on the basis of output signals of said single tone level measuring
means (128).
Claim 9
Dependent Claim
36 words
The communication system according to any one of claims 1 to 8, characterized
in that said pilot signal generating means (15, 115) generates a data sequence of
all "1" or a data sequence of all "0".
References Cited (Backward Citations)
No citation records indexed.
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