Source: http://www.google.com/patents/US7881740?ie=ISO-8859-1&dq=7493558
Timestamp: 2014-10-20 13:48:04
Document Index: 19317974

Matched Legal Cases: ['art 212', 'art 212', 'art 212', 'art 212', 'art 214', 'art 214', 'art 214', 'art 214', 'art 216', 'art 226', 'art 228', 'art 224', 'art 226', 'Application No. 2008', 'Application No. 03819354', 'Application No. 2004', 'Application No. 2008']

Patent US7881740 - 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/US7881740?utm_source=gb-gplus-sharePatent US7881740 - Radio channel control method and receiving apparatusAdvanced Patent SearchPublication numberUS7881740 B2Publication typeGrantApplication numberUS 11/730,671Publication dateFeb 1, 2011Filing dateApr 3, 2007Priority dateFeb 20, 2003Fee statusPaidAlso published asUS7885677, US7933624, US7945280, US8073396, US8073480, US8095171, US8135341, US8311569, US8331976, US8483736, US8660599, US20050130692, US20070173204, US20070173205, US20070173206, US20070184784, US20110092166, US20110111702, US20110117857, US20110136440, US20110143681, US20110165852, US20130157583Publication number11730671, 730671, US 7881740 B2, US 7881740B2, US-B2-7881740, US7881740 B2, US7881740B2InventorsHideto Furukawa, Takashi DatekiOriginal AssigneeFujitsu LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (50), Non-Patent Citations (33), Referenced by (2), Classifications (15), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetRadio channel control method and receiving apparatusUS 7881740 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.
controlling a rate matching rate for the radio channel based on the information.
3. The radio channel control method according to claim 2, wherein the information includes a bit �1� when the information indicates better reception quality than the reference quality and the information includes a bit �0� when the information indicates worse reception quality than the reference quality. Description
CROSS-REFERENCE TO RELATED APPLICATION This application 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.
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 carry out 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.
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 the 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.
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 1 into �3� when the input TPC bit is �0�, and determines the transmission parameters (the modulation method is 16QAM, 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.
In the reference value setting part 226, a reference value of the SIR is set. The comparison part 228 compares the SIR measured by the SIR measurement part 224 (referred to as a �SIR measurement value �hereinafter) and the SIR reference value set in the reference value setting part 226, and outputs a result thereof to the majority decision circuit 230.
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No. 11/043,307.32Supplemental European Search Report dated Jan. 26, 2010 in 03705365.9-1246/1542378 PCT/JP0301881.33Supplemental European search report in EP01274838.02415 dated Jul. 17, 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, 455/500, 370/328, 455/517, 370/343, 455/69, 455/423, 370/310, 455/67.11, 370/329International ClassificationH04B7/005, H04B7/00Cooperative ClassificationH04W28/0236, H04W52/24European ClassificationH04W52/24Legal EventsDateCodeEventDescriptionJul 2, 2014FPAYFee paymentYear of fee payment: 4Apr 3, 2007ASAssignmentOwner name: FUJITSU LIMITED, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FURUKAWA, HIDETO;DATEKI, TAKASHI;REEL/FRAME:019197/0523Effective date: 20050107RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google