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Timestamp: 2020-02-17 12:11:13
Document Index: 709874703

Matched Legal Cases: ['Application No. 2013', 'application No. 2006', 'application No. 2006', 'application No. 2012', 'application No. 2012', 'application No. 201010113078', 'application No. 04793255', 'Application No. 2013', 'Application No. 2013', 'Application No. 201210186925', 'Application No. 201210266481', 'Application No. 201010113078', 'Application No. 201210186925']

Communications apparatus and communications system using multicarrier transmission mode - Fijitsu Limited
Communications apparatus and communications system using multicarrier transmission mode
United States Patent 9036593
Ode, Takayoshi (Kawasaki, JP)
Kawasaki, Yoshihiro (Kawasaki, JP)
Kawabata, Kazuo (Kawasaki, JP)
14/175564
370/338, 375/260
H04W4/00; H04B1/707; H04J11/00; H04J13/00; H04L5/00; H04L27/26; H04W28/26; H04W48/08; H04W72/04; H04W72/08; H04W84/12; H04W72/00
370/328-338, 375/260
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The present application is a continuation of U.S. application Ser. No. 13/555,767, filed Jul. 23, 2012, which is now U.S. Pat. No. 8,705,479, issued Apr. 22, 2014, which is a continuation of U.S. application Ser. No. 12/607,570, filed on Oct. 28, 2009, now U.S. Pat. No. 8,363,610, which issued on Jan. 29, 2013, which is a continuation of U.S. application Ser. No. 11/790,789, filed on Apr. 27, 2007, now U.S. Pat. No. 7,953,167, which issued on May 31, 2011, which is a continuation of International application No. PCT/JP2004/016154, filed on Oct. 29, 2004, the contents of each are herein wholly incorporated by reference.
5. The mobile station as set forth in claim 4, wherein the setting information of the frequency band to be set as said at least one frequency band, other than the specific frequency band, is notified from the base station in advance.
A most preferred example of the above communications system discussed in the present invention is a mobile communications system. The following explanation will be made by taking as an example this mobile communications system. Accordingly, if according to this example, the communications apparatus is a (i) base station (or a higher base station controller thereof) and/or a (ii) mobile station (including a mobile terminal such as a PDA). Note that for convenience, in the later explanation, the former (i) will be referred to as the “base station” and the latter (ii) will be simply referred to as the “terminal” in some cases. Note that, as will be clear in the later explanation, the present invention can be substantially equivalently applied to not only the above base station, but also the above terminal. It is not particularly necessary to differentiate between the two.
Along with that, the used frequency band becomes 50×80 kHz=4 MHz for the user A and becomes 75×80 kHz=6 MHz for the user B. That is, the used frequency band is made variable for each user. In this case, it is assumed that the allocated subcarriers are consecutive on the frequency axis. Note that it is also possible to further make the sizes of the divisions of the frequency band variable.
FIG. 36 is a view showing the gist of the prior art disclosed in Patent Document 3. The figure shows making the frequency band of the data channel in FIG. 35 described above variable in accordance with a propagation distance (communication distance with the base station). Note that the transmission power is changed (large-medium-small).
First, referring to FIG. 1, the selection function in particular of a used frequency band selecting/setting unit 15 is used to select the used frequency band to be used with the other communications apparatus 20. The “used frequency band information” If (frequency) according to this selection is input to a transmission data generation unit 11 where transmission data Dt (transmission) combined integrally with transmission data (user data) Du (user) to be transmitted to the communications apparatus 20 is generated. Accordingly, the transmission data Dt includes the transmission data Du and the used frequency band information If, but in actuality further includes also other “communication control information” Ict (control). This information Ict is the information concerning a used modulation scheme for example QAM and information etc. concerning a one time transmission data amount of the transmission data Du.
On the other hand, when the signal received from the antenna AT contains information belonging to an “extension band”, the mixer 52′ and the local oscillator 53′extract the signal of the “extension band” and apply the same processing as the processing by the above-explained components 55 to 57 by the same components S/P 55′, FFT 56′, and P/S 57′ to obtain a time-transformed serial signal.
Further, the configurations shown in FIGS. 15A and 15B are the same as the configuration of FIG. 4 (or FIG. 6) explained before. The components to be newly noted are an SNR measurement unit 75 and a CQI calculation unit 76 in FIG. 15A and further an encoding unit 78 and an adder unit 79 in FIG. 15B after passing through a loop back path 77. Note that in FIG. 15A, parts corresponding to those in FIG. 4 (reception side) are indicated by using the reference numerals 52, 53, 54, . . . used in FIG. 4, while in FIG. 15B, parts corresponding to those in FIG. 3 (transmission side) are given the reference numerals 12, 37, 38, used in FIG. 3 plus 100 and thereby indicated as 112, 137, 138, . . . .
iii) Further, the frequency band usable by the communications apparatuses (10, 20) is restricted at the time of establishment of the wireless channel, and the main band and the extension band are dynamically assigned within that restricted frequency band
i) In order to judge necessity/unnecessity of an extension band, the difference between a predetermined transmission rate S1 assumed to be necessary for the exchange of information and an actual transmission rate S2 which is actually achieved (S1−S2) is calculated. It is judged whether the extension band is required or not required in accordance with the positive or negative sign of this difference, and
i) In a communications system for exchange of information between communications apparatuses (10, 20) by the multicarrier transmission mode using a series of subcarriers, in a case where the usage of only a part of the divided frequency bands (“band a”) is permitted at present among a plurality of divided frequency bands (band a to band d) formed by dividing the overall frequency band to be assigned to this communications system in the future (see “overall frequency band after lifting restriction” of FIG. 33) (see “restricted band”), that divided frequency band “band a” allowed to be used is operated further divided into one or more frequency bands (like band 1 to band 4 in Embodiments 1 to 10). At the same time, each of the other divided frequency bands which are restricted at present (band b, band c, and band d) is divided into one or more frequency bands in the same way as the former (like band 1 to band 4 in Embodiments 1 to 10) in advance. Then, when the restriction is lifted in the future, each of the plurality of divided frequency bands (band b to band d) which are formed by dividing the overall frequency band but not yet used at present is immediately operated by the same operation as the operation of dividing the divided frequency band (band a) allowed to be used at present into one or more frequency bands, and
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