Source: http://www.google.ca/patents/US20110117857
Timestamp: 2017-11-20 12:05:17
Document Index: 492729729

Matched Legal Cases: ['art 504', 'art 506', 'art 512', 'art 514', 'art 518', 'art 606', 'art 606', 'art 612', 'art 614', 'art 616', 'art 618', 'art 616', 'art 618', 'art 616', 'art 214', 'art 214', 'art 214', 'art 216', 'art 112', 'art 112', 'art 114', 'art 114', 'art 116', 'art 118', 'art 118', 'art 104', 'art 104', 'art 214', 'art 214', 'art 226', 'art 226', 'art 228', 'art 214', 'art 234', 'art 226', 'art 212', 'art 213', 'art 236']

Patent US20110117857 - 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/US20110117857?utm_source=gb-gplus-sharePatent US20110117857 - Radio Channel Control Method And Receiving Apparatus
Publication number US20110117857 A1
Application number US 13/011,298
Filing date 21 Jan 2011
Also published as US7881740, US7885677, US7933624, US7945280, US8073396, US8073480, US8095171, US8135341, US8311569, US8331976, US8483736, US8660599, US20050130692, US20070173204, US20070173205, US20070173206, US20070184784, US20110092166, US20110111702, US20110136440, US20110143681, US20110165852, US20130157583
Publication number 011298, 13011298, US 2011/0117857 A1, US 2011/117857 A1, US 20110117857 A1, US 20110117857A1, US 2011117857 A1, US 2011117857A1, US-A1-20110117857, US-A1-2011117857, US2011/0117857A1, US2011/117857A1, US20110117857 A1, US20110117857A1, US2011117857 A1, US2011117857A1
Patent Citations (28), Classifications (7), Legal Events (2)
US 20110117857 A1
1. A communication method performed by a transmitter used in a radio communication system, the communication method comprising:
transmitting a signal to a receiver; and
controlling 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.
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.
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.
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.
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 606, a decoder 610, a block error rate deriving part 612, a transmission parameter determination part 614, a transmission baseband part 616 and a transmission part 618.
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 616 outputs the input signal to the base station 500 via the circulator 604 and the antenna 602.
For example, it is assumed that the modulation method currently applied by the base station 100 is QPSK and the coding rate is 3/4. 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 1/2) 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 1/2) 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 circulator 108 of the base station 100 outputs the signal received from the mobile station 200 via the antenna 110 to the reception part 112. The reception part 112 outputs this signal to the demodulation part 114. The demodulation part 114 demodulates the input signal, and outputs the encoded data to the decoder 116. The decoder 116 decodes the input encoded data, and outputs the transmission parameter value thus obtained from the decoding to the transmission parameter setting part 116.
The transmission parameter setting part 118 recognizes the new coding rate and modulation method based on the input transmission parameter value and the correspondence relationship shown in FIG. 3 between the transmission parameter value and the transmission parameters. Further, the transmission parameter setting part 118 notifies the encoder 102 of the coding rate and notifies the modulation part 104 of the nodulation method. In data transmission from the base station 100 to the mobile station 200 after that, the encoder 102 applies the new coding rate and the modulation part 104 applies the new modulation method.
The majority decision circuit 230 may output, in addition to the comparison result which is one occurring more, a difference between the comparison results which are one occurring more and the comparison results which are one occurring less, to the transmission parameter determination part 214. In this case, assuming that the relationship between the transmission parameter values and the transmission parameters is chat shown in FIG. 3, the transmission parameter determination part 214 increases a changing amount of the transmission parameter value corresponding to the transmission parameters currently applied by the base station 100 as the difference is larger, and then determines the transmission parameters corresponding to the thus-changed transmission parameter value as new transmission parameters.
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. 6, the decoder 210 and the reference value setting part 226 are connected with one another in the mobile station 200, in comparison to the mobile communication system shown in FIG. 7.
On the other hand, when the NACK signal is successively input during the third predetermined period, the reference value setting part 226 raises the SIR reference value. When the SIB reference value is thus raised, a possibility that the comparison part 228 and the majority decision circuit 230 derive the comparison result indicating that the SIR measurement value is less then the SIR reference value increases. Accordingly, 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 in response to badness in the propagation environment.
FIG. 9 shows a configuration example of a 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. 5, 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 pact 208 and 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.
International Classification H04B7/00, H04B7/005, H04B17/00
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FURUKAWA, HIDETO;DATEKI, TAKASHI;REEL/FRAME:025678/0205