RADIO COMMUNICATION METHOD AND RADIO COMMUNICATION DEVICE

• US 20100103919A1
• Filed: 01/18/2008
• Published: 04/29/2010
• Est. Priority Date: 01/18/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yosoku, Naoya, Murakami, Yutaka
• Granted Patent: US 8,681,715 B2
• Time in Patent Office: Days
• US Class Current: 370/344
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

When the SC-FDMA method is used in combination with the multi-antenna transmission technique, a radio transmission method effectively improves the frequency use efficiency by performing appropriate frequency allocation to a plurality of antennas while suppressing degradation of the reception quality caused by interference. In the radio transmission method of the SC-FDMA type, according to the number of terminals simultaneously accessing a base station within a usable frequency band, it is possible to allocate all the transmission signals (transmission stream) to be transmitted by different antennas to different frequency bands or to use the MIMO transmission in combination. Moreover, according to the number of terminals making an access, the number of terminals which perform the MIMO transmission can be varied.

Claims

1. A wireless communication method for transmitting a single carrier frequency division multiple access signal, the method comprising:

a frequency allocating step of allocating frequency bands to a plurality of antennas of a terminal individually in a single carrier frequency division multiple access scheme; and

a selecting step of, when the frequency bands are allocated to the plurality of antennas, selecting between allocating different frequency bands to the plurality of antennas and allocating same frequency bands to the plurality of antennas, according to a communication environment.

2. The wireless communication method according to claim 1, wherein:

the frequency allocating step comprises allocating localized frequency bands to the plurality of antennas of the terminal individually in a localized single carrier frequency division multiple access scheme; and

when the localized frequency bands are allocated to the plurality of antennas, the selecting step comprises selecting between allocating different localized frequency bands to the plurality of antennas and allocating same localized frequency bands to the plurality of antennas, according to the communication environment.

3. The wireless communication method according to claim 1, wherein:

the frequency allocating step comprises allocating distributed frequency bands to the plurality of antennas of the terminal individually in a distributed single carrier frequency division multiple access scheme; and

when the distributed frequency bands are allocated to the plurality of antennas, the selecting step comprises selecting between allocating different distributed frequency bands to the plurality of antennas and allocating same distributed frequency bands to the plurality of antennas, according to the communication environment.

4. The wireless communication method according to one of claims 1 to 3, wherein the communication environment in the selecting step refers to the number of terminals that perform uplink communication at the same time, and the number of terminals is used as a reference of the selection in the selecting step.

5. A wireless communication method of a distributed single carrier frequency division multiple access scheme for allocating distributed frequency bands to terminals, the method comprising allocating frequency bands to a first terminal in the terminals in x carrier intervals, and allocating frequency bands to a second terminal in the terminals in y (x≠

y) carrier intervals.

6. The wireless communication method according to claim 5, wherein values of x and y are selected such that a lowest common multiple of x and y is x×

y.

7. A wireless communication method of a distributed single carrier frequency division multiple access scheme for allocating distributed frequency bands to terminals, the method comprising changing allocation of frequencies to the terminals over time.

8. A wireless communication method comprising the steps of:

in a base station, measuring received quality of a plurality of carriers that are allocated to a terminal;

in the terminal, acquiring information about the received quality; and

in the terminal, allocating transmission data to the plurality of carriers based on the information about the received quality such that the transmission data is not erroneous in a burst manner.

9. The wireless communication method according to claim 8, wherein the plurality of carriers allocated to the terminal are carriers in a localized frequency band.

10. A wireless communication apparatus that transmits a single carrier frequency division multiple access signal, the apparatus comprising:

a plurality of antennas; and

a frequency allocating section that, when the frequency bands are allocated to the plurality of antennas, selects between allocating different frequency bands to the plurality of antennas and allocating same frequency bands to the plurality of antennas, according to a communication environment, and that performs frequency allocation.