WIRELESS COMMUNICATION APPARATUS AND FREQUENCY HOPPING METHOD

• US 20120057449A1
• Filed: 05/28/2010
• Published: 03/08/2012
• Est. Priority Date: 05/29/2009
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Takaoka, Shinsuke, Imamura, Daichi, Nakao, Seigo
• Granted Patent: US 8,705,339 B2
• Time in Patent Office: Days
• US Class Current: 370/210
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04J 1/02 Details
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Disclosed are a wireless communication apparatus and frequency hopping method which minimize the change in the instantaneous power distribution characteristics of the time waveform of transmission signals when a plurality of channels are multiplexed by frequency division. At a terminal (200), a mapping unit (212) maps the PUCCH to frequency resources of a first slot, maps the PUSCH to frequency resources, among the frequency resources of the first slot, separated exactly by predetermined frequency spacing (B) from the frequency resources to which the PUCCH is mapped, and cyclically shifts the frequencies so as to map the PUCCH and PUSCH to frequency resources, within an IDFT or IFFT bandwidth, of a second slot while maintaining the predetermined frequency spacing (B), thereby allowing frequency hopping of the PUCCH and PUSCH between the first slot and the second slot.

Claims

1. A radio communication apparatus comprising:

an arrangement section that arranges a signal of a first channel to frequency resources of a first slot and a second slot transmitted in a predetermined transmission format and arranges a signal of a second channel to frequency resources located a predetermined frequency interval apart from a frequency resource of the frequency resources of the first slot in which the first channel is arranged; and

an inverse Fourier transform section that applies an inverse discrete Fourier transform or an inverse fast Fourier transform to the signals arranged in the first channel and the second channel,

wherein the arrangement section cyclically frequency shifts within an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth while maintaining the predetermined frequency interval, arranges the signals of the first channel and the second channel to frequency resources of the second slot and thereby causes the first channel and the second channel to perform frequency hopping between the first slot and the second slot.

2. The radio communication apparatus according to claim 1, wherein, when a frequency difference from the frequency resource to which the first channel is allocated to the frequency resource to which the second channel is allocated in the first slot is +B (−

B), the arrangement section cyclically frequency shifts the second channel to a frequency resource located +B (−

B) apart from the first channel in the second slot within an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth.

3. The radio communication apparatus according to claim 1, wherein, when a frequency difference from the frequency resource to which the first channel is allocated to the frequency resource to which the second channel in the first slot is allocated is +B (−

B), the arrangement section cyclically frequency shifts the second channel to a frequency resource located −

B (+B) apart from the first channel in the second slot within an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth.

4. The radio communication apparatus according to claim 1, wherein the predetermined frequency interval is set to be equal to or above a total bandwidth of the first channel region cyclically and continuously present in an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth.

5. The radio communication apparatus according to claim 1, wherein the predetermined frequency interval is set to be equal to or above a total bandwidth of guard bands (zero padding) cyclically and continuously present in an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth.

6. The radio communication apparatus according to claim 1, wherein the predetermined frequency interval is set to be equal to or above a total bandwidth of the first channel region and a guard band (zero padding) cyclically and continuously present in an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth.

7. The radio communication apparatus according to claim 1, wherein a signal mapped in an i-th channel (i=1 or 2) of the second slot is a signal resulting from repetition of a signal mapped in an i-th channel of the first slot.

8. The radio communication apparatus according to claim 1, wherein a signal mapped to at least one channel of the first channel and the second channel is a signal spread by a discrete Fourier transform or constant amplitude zero autocorrelation sequence.

9. The radio communication apparatus according to claim 1, wherein a signal mapped to two or more discontinuous frequency resources is a signal resulting from spectrum-dividing a signal spread by a discrete Fourier transform or constant amplitude zero autocorrelation sequence.

10. The radio communication apparatus according to claim 1, wherein a signal mapped to two or more discontinuous channels of a plurality of channels frequency hopped between slots is a signal resulting from spectrum-dividing a signal spread by a discrete Fourier transform or constant amplitude zero autocorrelation sequence.

11. The radio communication apparatus according to claim 1, wherein the predetermined frequency interval becomes narrower as a frequency resource of at least one of the first channel or the second channel approaches both edges of the inverse discrete Fourier transform or inverse fast Fourier transform band or moves apart from a central frequency of the inverse discrete Fourier transform or inverse fast Fourier transform band.

12. The radio communication apparatus according to claim 1, wherein the amount of cyclical frequency shift is an amount of shift corrected based on a hopping band in which the first channel or the second channel performs frequency hopping.

13. A frequency hopping method comprising:

an arranging step of arranging a signal of a first channel to frequency resources of a first slot and a second slot transmitted in a predetermined transmission format and arranging a signal of a second channel in a frequency resource located a predetermined frequency interval apart from a frequency resource of the frequency resources of the first slot in which the first channel is arranged; and

a transforming step of applying an inverse discrete Fourier transform or an inverse fast Fourier transform to the signals arranged in the first channel and the second channel,

wherein, in the arranging step, the signals of the first channel and the second channel are cyclically frequency shifted within an inverse discrete Fourier transform or inverse fast Fourier transform bandwidth while maintaining the predetermined frequency interval, arranged to frequency resources of the second slot, and the signals of the first channel and the second channel are thereby caused to perform frequency hopping between the first slot and the second slot.