Source: http://www.google.ca/patents/US8135341
Timestamp: 2017-11-17 23:08:54
Document Index: 92731668

Matched Legal Cases: ['art 504', 'art 506', 'art 512', 'art 514', 'art 518', 'art 606', 'art 608', 'art 612', 'art 614', 'art 616', 'art 618', 'art 214', 'art 214', 'art 214', 'art 216', 'art 214', 'art 214', 'art 212', 'art 208', 'art 213', 'art 224', 'art 226', 'art 228', 'art 226', 'art 234', 'art 226', 'art 212', 'art 208', 'art 213', 'art 236', 'Application No. 03819354', 'Application No. 2008', 'Application No. 11157228', 'Application No. 11157230', 'Application No. 11157231', 'Application No. 2008', 'Application No. 2004']

Patent US8135341 - Radio channel control method and receiving apparatus - Google Patents
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,...http://www.google.ca/patents/US8135341?utm_source=gb-gplus-sharePatent US8135341 - Radio channel control method and receiving apparatus
Publication number US8135341 B2
Application number US 12/976,325
Also published as US7881740, US7885677, US7933624, US7945280, US8073396, US8073480, US8095171, US8311569, US8331976, US8483736, US8660599, US20050130692, US20070173204, US20070173205, US20070173206, US20070184784, US20110092166, US20110111702, US20110117857, US20110136440, US20110143681, US20110165852, US20130157583
Publication number 12976325, 976325, US 8135341 B2, US 8135341B2, US-B2-8135341, US8135341 B2, US8135341B2
Patent Citations (51), Non-Patent Citations (54), Referenced by (4), Classifications (15), Legal Events (4)
US 8135341 B2
1. A radio communication system, comprising: a transmitter and a receiver, wherein the receiver includes,
a receiving unit that receives a signal transmitted from the transmitter;
a measuring unit that measures reception quality of the signal; and
a generating unit that generates information which indicates increment or decrement of the reception quality of the signal; and
a transmitting unit that transmits the information to the transmitter; and
a controlling unit that controls a number of spreading codes and a rate matching rate for a radio channel from the transmitter toward the receiver based on the information.
The base station 500 includes an encoder 502, a modulation part 504, a transmission part 506, a circulator 508, an antenna 510, a reception part 512, a demodulation part 514, a decoder 516 and a transmission parameter setting part 518. On the other hand, the mobile station 600 includes an antenna 602, a circulator 604, a reception part 606, a demodulation part 608, a decoder 810, a block error rate deriving part 612, a transmission parameter determination part 614, a transmission baseband part 616 and a transmission part 618.
FIG. 2 shows a configuration example of a mobile communication system according to a first embodiment of the present invention. The mobile communication system shown in FIG. 2 includes a base station 100 acting as a transmitting apparatus and mobile station 200 acting as a receiving station. This mobile communication system appropriately changes transmission parameters in response to a fluctuation of a propagation environment of a radio channel (downlink radio channel) toward the mobile station 200 from the base station 100. Hereinafter, it is assumed that, as the transmission parameters, a coding rate and a modulation method are applied.
For example, it is assumed that the modulation method currently applied by the base station 100 is QPSK and the coding rate is ¾. 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 ½) 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 and determines the transmission parameters (the modulation method is QPSK, and the coding rate is ½) corresponding to the transmission parameter value ‘1’ as new transmission parameters. The transmission parameter determination part 214 outputs the tramsmiision prater value corresponding to the new transmission parameters to the transmission baseband determination part 216.
It is noted that the majority decision circuit 220 may output, in addition to the TPC bit which is one occurring more, a difference between the number of the TPC bits, which are ones occurring more, and the number of the TPC bits, which are ones occurring less, to the transmission parameter determination part 214. In this case, the transmission parameter determination part 214 increases a changing amount of the transmission parameter value corresponding to the transmission parameters currently applied by the bate station 100, as the difference becomes larger, and determines the transmission parameters corresponding to the transmission parameter value, thus changed by the increased changing amount.
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 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, in comparison to the mobile communication system shown in FIG. 2.
FIG. 8 shows a configuration example of a mobile communication system according to a sixth embodiment of the present invention. In the mobile communication system shown in FIG. 8, the decoder 210 and the reference value setting part 226 are mobile connected with one another in the mobile station 200, in comparison to the mobile communication system shown in FIG. 7.
FIG. 9 shows a configuration example of mobile communication system according to a seventh embodiment of the present invention. In the mobile communication system shown, in comparison to the mobile communication system shown in FIG. 8, a ratio deriving part 234 is newly included between the decoder 210 and the reference value setting part 226 in the mobile station 200.
FIG. 11 shows a configuration example of a mobile communication system according to a ninth embodiment of the present invention. In the mobile communication system shown in FIG. 11, in comparison to the mobile communication system shown in FIG. 2, the TPC bit generation part 212 is not provided between the demodulation part 208 end the transmission parameter determination part 213, while a moving speed detection part 236 and a counter 238 are provided, in the mobile station 200. The counter 238 is connected with the decoder 210.
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U.S. Classification 455/39, 455/68, 370/310, 455/517, 455/426.1, 370/329, 370/328, 370/343, 455/522, 455/69
International Classification H04B7/005, H04B7/00
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FURUKAWA, HIDETO;DATEKI, TAKASHI;REEL/FRAME:025765/0204
28 Aug 2012 CC Certificate of correction