Source: https://patents.google.com/patent/US8483736
Timestamp: 2018-02-23 05:02:54
Document Index: 44922618

Matched Legal Cases: ['art 616', 'art 618', 'art 618', 'art 208', 'art 212', 'art 214', 'art 214', 'art 214', 'art 214', 'art 214', 'art 214', 'art 216', 'art 112', 'art 112', 'art 114', 'art 114', 'art 118', 'art 228', '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']

US8483736B2 - Radio channel control method and receiving apparatus - Google Patents
Radio channel control method and receiving apparatus
US8483736B2
US8483736B2 US12976400 US97640010A US8483736B2 US 8483736 B2 US8483736 B2 US 8483736B2 US 12976400 US12976400 US 12976400 US 97640010 A US97640010 A US 97640010A US 8483736 B2 US8483736 B2 US 8483736B2
Active, expires 2023-07-06
US12976400
US20110092166A1 (en )
Hideto Furukawa
Takashi Dateki
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.
This application is a divisional of application Ser. No. 11/730,671, 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.
In radio communication, in particular in a mobile communication, a radio channel set between communication apparatuses which carryout 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 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.
In order to achieve this object, in a mobile communication system having a transmitting apparatus and a receiving apparatus according to the present invention, in a radio channel control method for controlling a radio channel from the transmitting apparatus toward the receiving apparatus, the receiving apparatus generates transmission power control information for controlling transmission power of the radio channel according to a propagation environment of the radio channel; generates information concerning a transmission parameter based on the transmission power control information; and notifies the transmitting apparatus of the information concerning the transmission parameter; and the transmitting apparatus controls the radio channel based on the information concerning the transmission parameter received from the receiving apparatus.
FIG. 4 shows a configuration example of a mobile communication system in a second, embodiment of the present invention;
Further, the demodulation part 208 measures a signal-to-noise'power ratio (referred to as an ‘SIR’, hereinafter) of the downlink radio channel based on the input signal, and outputs the thus-obtained SIR to the TPC bit generation part 212.
The transmission parameter determination part 214 determines the coding ratio and the modulation method which are the transmission parameters, based on the input TPC bit. FIG. 3 shows a relationship between transmission parameter values and the transmission parameters (modulation method and coding rate). In FIG. 3, as the transmission parameter value increases, the transmission parameters corresponding thereto become those by which a communication quality can be ensured even for a case where the propagation environment is bad.
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 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 is ‘1’, 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 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 118.
The same as in the fourth embodiment, the majority decision circuit 230 determines, as to the comparison results input from the comparison part 228 during a second predetermined period, which is one occurring more between the comparison result indicating that the SIR measurement value is more than the SIR reference value and the comparison result indicating that the SIR measurement value is less than the SIR reference value. However, when the moving speed of the mobile station 200 is equal to or more than a predetermined value, since there is a high possibility that the propagation environment of the downlink radio channel changes for a large amount during a short period, the majority decision circuit 230 shortens the second predetermined period. Further, when the moving speed of the mobile station 200 is less than the predetermined value, since there is a low possibility that the propagation environment of the downlink radio channel changes for a large amount during a short period, the majority decision circuit 230 elongates the second predetermined period.
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.
Further, in the above-described embodiments, cases where the transmission parameters of the downlink radio channel are changed have been described. However, the present invention can also be applied for a case where transmission parameters of an uplink radio channel are changed. When the transmission parameters of the uplink radio channel are changed, the mobile station should have a configuration of the base station of the above-described embodiment, while the base station should have a configuration of the mobile station of the above-described embodiment.
1. A transmitter used in a wireless communication system including the transmitter and a receiver, comprising: a transmitting unit that transmits a signal to the receiver; and a controlling unit that controls a rate matching rate for a radio channel from the transmitter toward the receiver based on information generated by the receiver; wherein the information indicates increment or decrement of reception quality at the receiver.
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FURUKAWA, HIDETO;DATEKI, TAKASHI;REEL/FRAME:025765/0508