Wireless communication apparatus, mobile terminal and wireless communication method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G08C-015/00
H04W-004/00
H04W-072/00
H04J-001/00
H04B-007/208
H04B-007/00
출원번호
US-0337876
(2011-12-27)
등록번호
US-8355391
(2013-01-15)
우선권정보
JP-2005-010252 (2005-01-18)
발명자
/ 주소
Kashiwagi, Hiroki
Hamaguchi, Yasuhiro
출원인 / 주소
Sharp Kabushiki Kaisha
인용정보
피인용 횟수 :
5인용 특허 :
34
초록▼
Wireless communication with a communicating apparatus that is a limited band terminal capable of receiving only part of frequencies. A frequency channel allocating section allocates frequency channels, a terminal reception quality information processing section calculates an optimal modulation rate
Wireless communication with a communicating apparatus that is a limited band terminal capable of receiving only part of frequencies. A frequency channel allocating section allocates frequency channels, a terminal reception quality information processing section calculates an optimal modulation rate and required transmit power for each subcarrier, a subcarrier power control section controls a level of transmit power for each subcarrier, and a determining section checks a reception bandwidth of a communicating apparatus, while determining whether the communicating apparatus is a full band terminal capable of receiving all the frequency channels in the system band or a limited band terminal capable of receiving only part of frequencies. When the communicating apparatus is the limited band terminal, the transmit power of all or part of subcarriers is decreased in a frequency channel that is adjacent to a reception band allocated to the communicating apparatus and that is allocated to another communicating apparatus.
대표청구항▼
1. A receiving apparatus configured for a wireless communication system, comprising: a receiving circuit for receiving from a transmitting apparatus an orthogonal frequency division multiplexing (OFDM) signal generated using a first frequency band that includes a plurality of frequency channels, whe
1. A receiving apparatus configured for a wireless communication system, comprising: a receiving circuit for receiving from a transmitting apparatus an orthogonal frequency division multiplexing (OFDM) signal generated using a first frequency band that includes a plurality of frequency channels, wherein data for transmission to the receiving apparatus is allocated to a subset of the plurality of frequency channels, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other, wherein no power is allocated to at least one adjacent frequency channel that is adjacent to the subset of the plurality of frequency channels, and wherein control data is allocated to at least one frequency channel of the plurality of frequency channels in such a way that said control data allocated to the at least one frequency channel of the plurality of frequency channels can be demodulated and used by the receiving apparatus;signal processing components configured to demodulate the control data and the data allocated to the subset of the plurality of frequency channels; andsignal transmitting components configured to notify the transmitting apparatus that the receiving apparatus is a limited band terminal configured for receiving a limited frequency band comprising the subset of the plurality of frequency channels of the first frequency band. 2. The receiving apparatus according to claim 1, wherein the signal transmitting components are further configured to notify the transmitting apparatus of a reception bandwidth of the limited band terminal. 3. The receiving apparatus according to claim 2, wherein the control data indicates which of the frequency channels were selected by the transmitting apparatus for inclusion in the subset of the plurality of frequency channels based on the reception bandwidth; and wherein the receiving circuit is configured to receive the OFDM signal on the subset of the plurality of frequency channels in response to the control data. 4. The receiving apparatus according to claim 1, wherein the signal processing components are configured to demodulate the data allocated to the subset of the plurality of frequency channels in response to demodulating the control data allocated to the subset of the plurality of frequency channels. 5. The receiving apparatus according to claim 1, wherein the subset of the plurality of frequency channels is a single frequency channel. 6. The receiving apparatus according to claim 1, wherein one frequency channel included in the subset of the plurality of frequency channels is positioned at an edge of the first frequency band. 7. A method for processing orthogonal frequency division multiplexing (OFDM) signals received by a receiving apparatus configured for a wireless communication system, the method comprising: notifying the transmitting apparatus that the receiving apparatus is a limited band terminal configured for receiving a limited frequency band comprising a subset of a plurality of frequency channels of a first frequency band, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other;receiving from the transmitting apparatus an OFDM signal generated using the first frequency band, wherein data for transmission to the receiving apparatus is allocated to the subset of the plurality of frequency channels, where no power is allocated to at least one adjacent frequency channel that is adjacent to the subset of the plurality of frequency channels, and wherein control data is allocated to at least one frequency channel of the plurality of frequency channels in such a way that said control data allocated to the at least one frequency channel of the plurality of frequency channels can be demodulated and used by the receiving apparatus; anddemodulating the control data and the data allocated to the subset of the plurality of frequency channels. 8. The method according to claim 7, further comprising the step of notifying the transmitting apparatus of a reception bandwidth of the limited band terminal. 9. The method according to claim 8, wherein the control data indicates which of the frequency channels were selected by the transmitting apparatus for inclusion in the subset of the plurality of frequency channels based on the reception bandwidth; and wherein the OFDM signal is received on the subset of the plurality of frequency channels in response to the control data. 10. The method according to claim 7, wherein the data allocated to the subset of the plurality of frequency channels is demodulated in response to demodulating the control data allocated to the subset of the plurality of frequency channels. 11. The method according to claim 7, wherein the subset of the plurality of frequency channels is a single frequency channel. 12. The method according to claim 7, wherein one frequency channel included in the subset of the plurality of frequency channels is positioned at an edge of the first frequency band. 13. A receiving apparatus configured for a wireless communication system, comprising: a receiving circuit for receiving from a transmitting apparatus an orthogonal frequency division multiplexing (OFDM) signal generated using a first frequency band that includes a plurality of frequency channels, wherein data for transmission to the receiving apparatus is allocated to a subset of the plurality of frequency channels, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other, wherein no power is allocated to at least one adjacent frequency channel that is adjacent to the subset of the plurality of frequency channels, and wherein one frequency channel included in the subset of the plurality of frequency channels is positioned at an edge of the first frequency band;signal processing components configured to demodulate the data allocated to the subset of the plurality of frequency channels; andsignal transmitting components configured to notify the transmitting apparatus that the receiving apparatus is a limited band terminal configured for receiving a limited frequency band comprising the subset of the plurality of frequency channels of the first frequency band. 14. The receiving apparatus of claim 13, wherein control data is allocated to at least one frequency channel of the plurality of frequency channels in such a way that said control data allocated to the at least one frequency channel of the plurality of frequency channels can be demodulated and used by the receiving apparatus. 15. The receiving apparatus according to claim 14, wherein the signal transmitting components are further configured to notify the transmitting apparatus of a reception bandwidth of the limited band terminal. 16. The receiving apparatus according to claim 15, wherein the control data indicates which of the frequency channels were selected by the transmitting apparatus for inclusion in the subset of the plurality of frequency channels based on the reception bandwidth; and wherein the receiving circuit is configured to receive the OFDM signal on the subset of the plurality of frequency channels in response to the control data. 17. The receiving apparatus according to claim 14, wherein the signal processing components are configured to demodulate the data allocated to the subset of the plurality of frequency channels in response to demodulating the control data allocated to the subset of the plurality of frequency channels. 18. The receiving apparatus according to claim 13, wherein the subset of the plurality of frequency channels is a single frequency channel. 19. A method for processing orthogonal frequency division multiplexing (OFDM) signals received by a receiving apparatus configured for a wireless communication system, the method comprising: notifying a transmitting apparatus that the receiving apparatus is a limited band terminal configured for receiving a limited frequency band comprising a subset of a plurality of frequency channels of a first frequency band;receiving from the transmitting apparatus an orthogonal frequency division multiplexing (OFDM) signal generated using the first frequency band, wherein data for transmission to the receiving apparatus is allocated to the subset of the plurality of frequency channels, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other, wherein no power is allocated to at least one adjacent frequency channel that is adjacent to the subset of the plurality of frequency channels, and wherein one frequency channel included in the subset of the plurality of frequency channels is positioned at an edge of the first frequency band; anddemodulating the data allocated to the subset of the plurality of frequency channels. 20. The method according to claim 19, wherein control data is allocated to at least one frequency channel of the plurality of frequency channels in such a way that said control data allocated to the at least one frequency channel of the plurality of frequency channels can be demodulated and used by the receiving apparatus. 21. The method according to claim 20, further comprising the step of notifying the transmitting apparatus of a reception bandwidth of the limited band terminal. 22. The method according to claim 21, wherein the control data indicates which of the frequency channels were selected by the transmitting apparatus for inclusion in the subset of the plurality of frequency channels based on the reception bandwidth; and wherein the method further comprises the step of receiving the OFDM signal on the subset of the plurality of frequency channels in response to the control data. 23. The method according to claim 20, wherein the signal processing components are configured to demodulate the data allocated to the subset of the plurality of frequency channels in response to demodulating the control data allocated to the subset of the plurality of frequency channels. 24. The method according to claim 19, wherein the subset of the plurality of frequency channels is a single frequency channel.
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