Source: http://www.google.ca/patents/US20050130692
Timestamp: 2018-01-17 22:09:26
Document Index: 743790500

Matched Legal Cases: ['art 214', 'art 214', 'art 214', 'art 216', 'art 226', 'art 214', 'art 226', 'art 226', 'art 214']

Patent US20050130692 - Radio channel control method and receiving apparatus - Google Patents
According to the present invention, in response to a propagation environment of a radio channel, based on transmission power control information for controlling transmission power of the radio channel, a receiving apparatus generates information concerning a transmission parameter; notifies the information...http://www.google.ca/patents/US20050130692?utm_source=gb-gplus-sharePatent US20050130692 - Radio channel control method and receiving apparatus
Publication number US20050130692 A1
Application number US 11/043,307
Also published as US7881740, US7885677, US7933624, US7945280, US8073396, US8073480, US8095171, US8135341, US8311569, US8331976, US8483736, US8660599, US20070173204, US20070173205, US20070173206, US20070184784, US20110092166, US20110111702, US20110117857, US20110136440, US20110143681, US20110165852, US20130157583
Publication number 043307, 11043307, US 2005/0130692 A1, US 2005/130692 A1, US 20050130692 A1, US 20050130692A1, US 2005130692 A1, US 2005130692A1, US-A1-20050130692, US-A1-2005130692, US2005/0130692A1, US2005/130692A1, US20050130692 A1, US20050130692A1, US2005130692 A1, US2005130692A1
Original Assignee Hideto Furukawa, Takashi Dateki
Patent Citations (28), Referenced by (13), Classifications (7), Legal Events (3)
US 20050130692 A1
generating information concerning a transmission parameter based on the transmission power control information; and
notifying the transmitting apparatus of the information concerning a transmission parameter; and
controlling the radio channel based on the information concerning the transmission parameter received from the receiving apparatus.
generating the information concerning the transmission parameter based on the transmission power control information generated during a first predetermined period.
generating the information concerning the transmission parameter based on one, which occurs most, from among the transmission power control information generated during the first predetermined period.
5. A radio channel control method for controlling, in a mobile communication system having a transmitting apparatus and a receiving apparatus, a radio channel from the transmitting apparatus toward the receiving apparatus, wherein:
measuring a signal-to-noise power ratio of the radio channel;
generating information concerning a transmission parameter based on a comparison result obtained from comparing the signal-to-noise ratio with a predetermined reference value; and
notifying the transmitting apparatus of the information concerning the transmission parameter; and
6. The radio channel control method as claimed in claim 5, wherein:
generating the information concerning the transmission parameter based on a comparison result obtained from comparing the signal-to-noise ratio measured during a second predetermined period with the predetermined reference value.
7. The radio channel control method as claimed in claim 6, wherein:
generating the information concerning the transmission parameter based on one, which occurs most, from among comparison results obtained from comparing the signal-to-noise ratios measured during the second predetermined period with the predetermined reference value.
8. The radio channel control method as claimed in claim 6, wherein;
changing the second predetermined period based on a moving speed of the own apparatus.
9. The radio channel control method as claimed in claim 5, wherein;
changing the predetermined reference value based on whether or not reception of information transmitted via the radio channel is succeeded in.
10. The radio channel control method as claimed in claim 9, wherein;
changing the predetermined reference value based on whether or not reception of information transmitted via the radio channel is succeeded in during a third predetermined period.
11. The radio channel control method as claimed in claim 10, wherein;
changing the predetermined reference value based on a ratio of success/failure in reception of information transmitted via the radio channel during the third predetermined period.
12. The radio channel control method as claimed in claim 10, wherein;
changing the third predetermined period based on a moving speed of the own apparatus.
13. A radio channel control method for controlling, in a mobile communication system having a transmitting apparatus and a receiving apparatus, a radio channel from the transmitting apparatus toward the receiving apparatus, wherein:
determining whether or not reception of information transmitted via the radio channel is succeeded in;
generating information concerning a transmission parameter based on success/failure in reception of information transmitted via the radio channel; and
14. The radio channel control method as claimed in claim 13, wherein:
generating the information concerning the transmission parameter based on success/failure in reception of information transmitted via the radio channel during a fourth predetermined period; and
15. A receiving apparatus receiving information from a transmitting apparatus, comprising:
a transmission parameter concerned information generating part generating information concerning a transmission parameter based on the transmission power control information; and
a transmission parameter concerned information notifying part notifying the transmitting apparatus of the information concerning the transmission parameter.
16. The receiving apparatus as claimed in 15, wherein:
said transmission parameter concerned information generating part generates the information concerning the transmission parameter based on the transmission power control information generated during a first predetermined period.
17. The receiving apparatus as claimed in claim 16 wherein:
said transmission parameter concerned information generating part generates the information concerning the transmission parameter based on one, which occurs most, from among the transmission power control information generated
during the first predetermined period.
18. The receiving apparatus as claimed in claim 16, comprising:
19. A receiving apparatus receiving information transmitted from a transmitting apparatus, comprising:
a signal-to-noise ratio measuring part measuring a signal-to-noise power ratio of the radio channel;
a transmission parameter concerned information generating part generating information concerning a transmission parameter based on a comparison result obtained from comparing the signal-to-noise ratio with a predetermined reference value; and
transmission parameter concerned information notifying part notifying the transmitting apparatus of the information concerning the transmission parameter.
20. The receiving apparatus as claimed in claim 19, wherein:
said transmission parameter concerned information generating part generates the information concerning the transmission parameter based on a comparison result obtained from comparing the signal-to-noise ratio measured during a second predetermined period with the predetermined reference value.
21. The receiving apparatus as claimed in claim 20, wherein:
said transmission parameter concerned information generating part generates the information concerning the transmission parameter based on one, which occurs most, from among comparison results obtained from comparing the signal-to-noise ratios measured during the second predetermined period with the predetermined reference value.
22. The receiving apparatus as claimed in claim 20, comprising:
a second predetermined period changing part changing the second predetermined period based on a moving speed of the own apparatus.
23. The receiving apparatus as claimed in claim 19, comprising:
a reference value changing part changing the predetermined reference value based on success/failure in reception of information transmitted via the radio channel.
24. The receiving apparatus as claimed in claim 23, wherein:
said reference value changing part changes the predetermined reference value based on success/failure in reception of information transmitted via the radio channel during a third predetermined period.
25. The receiving apparatus as claimed in claim 24, wherein:
said reference value changing part changes the predetermined reference value based on a ratio of success/failure in reception of information transmitted via the radio channel during the third predetermined period.
26. The receiving apparatus as claimed in claim 24, comprising:
a third predetermined number changing part changing the third predetermined period based on a moving speed of the own apparatus.
27. A receiving apparatus receiving information transmitted from a transmitting apparatus, comprising:
a reception success determining part determining whether or not reception of information transmitted via the radio channel is succeeded in;
a transmission parameter concerned information generating part generating information concerning a transmission parameter based on success/failure in reception of information transmitted via the radio channel; and
28. The receiving apparatus as claimed in claim 27, wherein:
said transmission parameter concerned information generating part generates the information concerning the transmission parameter based on success/failure in reception of information transmitted via the radio channel during a fourth predetermined period; and
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 tramsmiision prater value corresponding to the new transmission parameters to the transmission baseband determination part 216.
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.
In this ninth embodiment, the decoder 210 in the mobile station 200 determines whether or nor data reception is succeeded in, as in the sixth embodiment. Further, the decoder 210 outputs an ACK signal to the reference value setting part 226 when data reception has been succeeded in. The decoder 210 outputs a NACK signal to the reference value setting part 226 when data reception has been failed in The counter 238 counts the number of ACK signals and NACK signals output from the decoder 210 during a fourth predetermined period, and outputs it to the transmission parameter determination part 214. 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 counter 238 shortens the fourth 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 counter 238 elongates the fourth predetermined period.
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