Source: http://www.google.com/patents/US8095171?dq=5927278
Timestamp: 2014-12-26 15:19:49
Document Index: 482909642

Matched Legal Cases: ['art 518', 'art 504', 'art 518', 'art 504', 'art 506', 'art 506', 'art 616', 'art 618', 'art 618', 'art-508', 'art 514', 'art 518', 'art 612', 'art 118', 'art 104', 'art 104', 'art 118', 'art 106', 'art 218', 'art 206', 'art 106', 'art 212', 'art 212', 'art 212', 'art 212', 'art 214', 'art 214', 'art 214', 'art 214', 'art 214', 'art 214', 'art 216', 'art 216', 'art 218', 'art 218', 'art 212', 'art 208', 'art 213', 'art 224', 'art 226', 'art 228', 'art 232', 'art 208', 'art 226', 'art 214', 'art 226', 'art 214', 'Application No. 03819354', 'Application No. 2008', 'Application No. 11157228', 'Application No. 11157230', 'Application No. 11157231', 'Application No. 2008', 'Application No. 2004']

Patent US8095171 - Radio channel control method and receiving apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal,...http://www.google.com/patents/US8095171?utm_source=gb-gplus-sharePatent US8095171 - Radio channel control method and receiving apparatusAdvanced Patent SearchPublication numberUS8095171 B2Publication typeGrantApplication numberUS 13/011,527Publication dateJan 10, 2012Filing dateJan 21, 2011Priority dateFeb 20, 2003Also published asUS7881740, US7885677, US7933624, US7945280, US8073396, US8073480, US8135341, US8311569, US8331976, US8483736, US8660599, US20050130692, US20070173204, US20070173205, US20070173206, US20070184784, US20110092166, US20110111702, US20110117857, US20110136440, US20110143681, US20110165852, US20130157583Publication number011527, 13011527, US 8095171 B2, US 8095171B2, US-B2-8095171, US8095171 B2, US8095171B2InventorsHideto Furukawa, Takashi DatekiOriginal AssigneeFujitsu LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (52), Non-Patent Citations (54), Referenced by (2), Classifications (16), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetRadio channel control method and receiving apparatusUS 8095171 B2Abstract A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information.
a transmitter and a receiver; wherein
the transmitter includes,
a transmitting unit to transmit a signal to the receiver: and
a controller to control a rate matching rate of a radio channel according to a decision made by using information which indicates increment or decrement of reception quality of the signal; and wherein
the receiver includes,
a receiving unit to receive a signal from the transmitter. Description
CROSS-REFERENCE TO RELATED APPLICATION This application is a divisional of application Ser. No. 11/730,670, filed Apr. 3, 2007, which is a divisional of application Ser. No. 11/043,307, filed Jan. 26, 2005, which is a U.S. continuation application filed under 35 USC 111 (a) claiming benefit under 35 USC 120 and 365 (c) of PCT application JP03/01881, filed Feb. 20, 2003. The foregoing applications are hereby incorporated herein by reference in their entirety.
TECHNICAL FIELD The present invention relates to a radio channel control method for, in a mobile communication system having a transmitting apparatus and a receiving apparatus, controlling a radio channel from the transmitting apparatus toward the receiving apparatus, and to the receiving apparatus for which the radio channel control method is applied.
BACKGROUND ART In radio communication, in particular in a mobile communication, a radio channel set between communication apparatuses which carry out information transmission/reception is likely to fluctuate. In order to carryout information transmission using such a radio channel appropriately, transmission parameters of the radio channel is appropriately changed. The transmission parameters include, for example, a modulation method, a coding rate, a ratio of the number of true, information bits with respect' to the number of total transmission. bits including redundancy bits such as error correction bits (referred to as a �Rate-Matching ratio�, hereinafter), or the number of spreading codes used in a CDMA (Code Division Multiple Access) communication.
Change of the transmission parameters of the radio channel from the base station 500 toward the mobile station 600 (referred to as a �downlink radio channel�, hereinafter) is carried out in the following procedure. That is, based on the coding rate used as the transmission parameter notified of by the transmission parameter setting part 518, the encoder 502 of the base station 500 encodes input data to be transmitted, and outputs it to the modulation part 504. Based on the modulation method notified of by the transmission parameter setting . part 518, the modulation part 504 modulates a baseband signal with the data encoded (referred to as �encoded data�, hereafter), and outputs it as a signal to be transmitted to the transmission part 506. The transmission part 506 transmits the signal modulated by the encoded data, to the mobile station 600, via the circulator 508 and the antenna 510.
The transmission baseband part 616 encodes the information concerning the new transmission parameters, and further, modulates a baseband signal of an uplink direction toward the base station 500 (referred to as an �uplink baseband signal�, hereinafter) by the information concerning the new transmission parameters, and outputs the same to the transmission part 618. The transmission part 618 outputs the input signal to the base station 500 via the circulator 604 and the antenna 602.
The reception part-508 of the base station. 500 receives the signal from the mobile station 600 via the antenna 510 and the circulator 508, and outputs the same to the demodulation part 514. The demodulator 514 demodulates the input signal, and outputs the encoded data to the decoder 516. The decoder 516 decodes the input encoded data, and outputs the information concerning the transmission parameters obtained from the decoding, to the transmission parameter setting part 518.
However, in the above-described method of changing the transmission parameters, a time is required for deriving the block error rate by means of the block error rate deriving part 612. Thereby, the base station 500 cannot change the transmission, parameters rapidly in response to a fluctuation of the propagation environment of the downlink radio channel.
DISCLOSURE OF THE INVENTION An object of the present invention is to provide a radio channel control method and a receiving apparatus solving the above-mentioned problem, by which it is possible to rapidly respond to a fluctuation of a propagation environment of a radio channel.
BRIEF DESCRIPTION OF DRAWINGS Other objects, features and advantages of the present invention will become more apparent from reading the following detailed description with reference to accompanying documents.
FIG. 10 Shows-a configuration example of a mobile communication system in an eighth embodiment of the present invention; and
BEST MODE FOR CARRYING OUT THE PRESENT INVENTION Embodiments of the present invention are described below with reference to figures.
Change of the transmission parameters of the downlink radio-channel from the base station 100 toward the mobile station 200 is carried out by the following procedures. That is, based on the coding rate which is the transmission parameter notified of from the transmission parameter setting part 118, the encoder 102 of the base station 100 encodes input data to be transmitted. Further, the encoder 102 outputs the encoded data obtained from the encoding to the modulation part 104. The modulation part 104 demodulates a base band signal with the encoded data based on the modulation method notified of by the transmission parameter setting part 118, and outputs it to the transmission part 106,
The same as the circulator 108 of the base station 100, the circulator 204 of the mobile station 200 transmits a signal from the transmission part 218, at predetermined periods via the antenna 202, while it outputs a signal received via the antenna 202, to the reception part 206. The circulator 204 in this case outputs the signal which the antenna 202 receives from the base station 100, to the reception part 106.
The TPC bit generation part 212 compares the input SIR with a predetermined reference value, and, based on the comparison result, generates a bit (referred to as a �TPC bit�, hereinafter) for ordering the base station 100 to increase or decrease of transmission power of the downlink radio channel. Specifically, the TPC bit generation part 212 generates the TPC bit �0� for ordering the base station 100 to increase the transmission power in a case where th SIR is less than the reference value since the propagation environment of the downlink radio channel is bad, while, the TPC bit generation part 212 generates the TPC bit �1�for ordering the base station 100 to decrease the transmission power in a case where the SIR is equal to or higher than the reference value since the propagation environment of the downlink radio channel is good. Further, the TPC bit generation part 212 outputs the generated TPC bit to the transmission parameter determination part 214.
When the input TPC bit is �0�, that is, for a case where the propagation environment of the downlink radio channel is bad and the transmission power of the downlink radio channel is to be increased, the transmission parameter determination part 214 increases the transmission parameter value corresponding to the transmission parameters currently applied by the base station 100 so as to change the coding rate into a smaller one or change the modulation method into one which applies larger energy per bit, and determines the transmission parameters corresponding to the thus-increased transmission parameter value as new transmission parameters. On the other hand, when the input TPC bit is �1�, that is, for a case where, the propagation environment of the downlink radio channel is good and the transmission power of the downlink radio channel is to lowered, the transmission parameter determination part 214 decreases the transmission parameter value corresponding to the transmission parameters currently applied by the base station 100 so as to change the coding rate into a larger one or change the modulation method into one which applies smaller energy per bit, and determines the transmission parameters corresponding to the thus-lowered transmission parameter value as new transmission parameters.
For example, it is assumed that the modulation method currently applied by the base station 100 is QPSK and the coding rate is �. In this case, the transmission parameter value �2� corresponds to these transmission parameters according to FIG. 3. The transmission parameter determination part 214 increases the transmission parameter value by 1into �3� when the input TPC bit is �0�, and determines the transmission parameters (the modulation method is 16 QAM, and the coding rate is �) corresponding to the transmission parameter value �3� as new transmission parameters. On the other hand, the transmission parameter determination part 214 decreases the transmission parameter value by 1 into �1�when the input TPC bit is �1�, and determines the transmission parameters (the modulation method is QPSK, and the coding rate is �) corresponding to the transmission parameter value �1� as new, transmission parameters. The transmission parameter determination part 214 outputs the transmission prater value corresponding to the new transmission parameters to the transmission baseband determination part 216.
The transmission baseband part 216 encodes the transmission parameter value, modulates the baseband signal the base station 200 by the thus-encoded transmission parameter value, and outputs it to the transmission part 218. The transmission part 218 then outputs the input signal to the circulator 204. The circulator 204 transmits the signal to be transmitted, at predetermined timing to the base station 100 via the antenna 202.
According to the third embodiment described above, the mobile station 200 can increase the frequency of transmitting the transmission parameter value when the moving speed of the mobile station 200 is high and there is a high possibility that the propagation environment of the downlink radio channel changes for a large amount during a short period, while it can reduce the frequency of transmitting the transmission parameter value when the moving speed of the mobile station 200 is low and there is a low possibility that the propagation environment of the downlink radio channel changes for a large amount during a short period. Thereby, the mobile station 209 can transmit the transmission parameter value with a suitable frequency in response to the propagation environment of the downlink radio channel.
FIG. 6 shows a configuration example of a mobile communication system according to a fourth embodiment of the present invention. In the mobile communication system shown in FIG. 6, the mobile station 200 does not includes the TPC bit generation part 212 between the demodulation part 208 and the transmission parameter determination part 213, while newly including a SIR measurement part 224, a reference value setting part 226, a comparison part 228 and a majority decision circuit 230, comparison to the mobile communication system shown in FIG. 2.
FIG. 7 shows a configuration example of mobile communication system according to a fifth embodiment of the present invention. In the mobile communication system shown in FIG. 7, the mobile station 200 newly includes a moving speed detection part 232 between the demodulation part 208 and the majority decision circuit 230, in comparison to the mobile communication system shown in FIG. 6.
According to the fifth embodiment described above, the same as in the third embodiment, the mobile station 200 can increase the frequency of transmitting the transmission parameter value when the moving speed of the mobile station 200 is high and there is a high possibility that the propagation environment of the downlink radio channel changes for a large amount during a short period, while it can reduce the frequency of transmitting the transmission parameter value when the moving speed of the mobile station 200 is low and there is a low possibility that the propagation environment of the downlink radio channel changes for a large amount within a short period. Thereby, the mobile station 200 can transmit the transmission parameter value with a suitable frequency in response to a fluctuation of the propagation, environment of the downlink radio channel.
When the ratio, of the ACK signals is equal to or more than a predetermined value, or when the ratio of the NACK signals is less than a predetermined value, the reference value setting part 226 lowers the SIR reference value. When the SIR reference value is thus lowered, as in the sixth embodiment, a possibility that the transmission parameter determination part 214 changes the coding rate to a larger one or changes the transmission method into one applying smaller transmission energy per bit increases. Thus, it is possible to improve the transmission efficiency of the downlink radio channel.
On the other hand, when the ratio of the ACK signals is less than a predetermined value, or when the ratio of the NACK signals is equal to or more than a predetermined value, the reference value setting part 226 raises the SIR reference value. When the SIR reference value is thus raised, as in the sixth embodiment, a possibility that the transmission parameter determination part 214 changes the coding rate to, a smaller one or changes the transmission method into one applying larger transmission energy per bit increases. Thus, it is possible to improve the transmission quality of the downlink radio channel.
Further, according to the ninth embodiment, the mobile station 200 can increase the frequency of transmitting the transmission parameter value when the moving speed of the mobile station 200 is high and there is a high possibility that, the propagation environment of the downlink radio channel changes for a large amount during a short period, while it can reduce the frequency of transmitting the transmission parameter value when the moving speed of the mobile station 200 is low and there is a low possibility that the propagation environment of the downlink radio channel changes for a large amount during a short period. Thereby, the mobile station 200 can transmit the transmission parameter value with a suitable frequency in response to a fluctuation of the propagation environment of the downlink radio channel.
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No. 11/730,670.52Patent Appeal Decision dated Jul. 27, 2010 received in corresponding Japanese Patent Application No. 2004-568488.53Supplemental European Search Report dated Jan. 26, 2010 received in 03705365.9-124611542378 PCT/JP0301881.54Supplemental European Search Report received in EP01274838.02415 dated Jul. 18, 2007.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8351974 *Jan 28, 2009Jan 8, 2013Lg Electronics Inc.Method of controlling transmit power of uplink channelUS20090197630 *Jan 28, 2009Aug 6, 2009Ahn Seung JinMethod of controlling transmit power of uplink channel* Cited by examinerClassifications U.S. Classification455/522, 370/310, 370/343, 455/69, 370/329, 455/500, 455/434, 455/67.11, 370/338, 370/328, 455/517International ClassificationH04B7/00, H04B7/005Cooperative ClassificationH04W52/24, H04W28/0236European ClassificationH04W52/24Legal EventsDateCodeEventDescriptionJan 21, 2011ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FURUKAWA, HIDETO;DATEKI, TAKASHI;REEL/FRAME:025679/0559Effective date: 20050107Owner name: FUJITSU LIMITED, JAPANRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google