TRANSMISSION STATION, RECEIVING STATION, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION METHOD

• US 20120236832A1
• Filed: 03/07/2012
• Published: 09/20/2012
• Est. Priority Date: 03/15/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ogawa, Daisuke
• Granted Patent: US 9,072,111 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A transmission station includes a communication section configured to perform transmission and reception of data with a receiving station by using a plurality of wireless carriers whose frequency bands differ from one another, and a processor configured to obtain reception qualities of a plurality of wireless carriers which are reported from the receiving station, and configured to assign a gap for each of the wireless carriers, in accordance with the obtained reception quality of the each of the wireless carriers, the gap being a period over which transmission of the data is stopped.

Claims

1. A transmission station comprising:

a communication section configured to perform transmission and reception of data with a receiving station by using a plurality of wireless carriers whose frequency bands differ from one another; and

a processor configured to obtain reception qualities of a plurality of wireless carriers which are reported from the receiving station, and configured to assign a gap for each of the wireless carriers, in accordance with the obtained reception quality of the each of the wireless carriers, the gap being a period over which transmission of the data is stopped.

2. The transmission station according to claim 1, further comprising:

a storage that prestores patterns of the plurality of gaps whose cyclic periods or time widths differ from one another,

wherein the processor selects, from the storage, the pattern of the gap so that the lower the obtained reception quality of the each of the wireless carriers is, the shorter the cyclic period is or the larger the time width is, and assigns the gap.

3. The transmission station according to claim 1, wherein the processor determines the cyclic periods or time widths of the gap, based on the levels of the obtained reception qualities of the wireless carriers, the gap being assigned for the each of the wireless carriers within a certain time period.

4. The transmission station according to claim 1, wherein the processor sets, for each of the wireless carriers, the number of frequencies to be measured by the receiving station in the corresponding gap in accordance with the obtained reception quality of the each of the wireless carriers, and determines the cyclic period or the time width of the gap that is assigned to the wireless carrier within a certain time period by using the set number of frequencies for the each of the wireless carriers.

5. The transmission station according to claim 1, wherein the processor obtains, as the reception quality of each of the wireless carriers, at least one of a signal power to interference and noise power ratio, a reference signal received quality, a channel quality indicator, and a channel capacity, which are reported from the receiving station.

6. A receiving station comprising:

a communication section configured to transmit, to a transmission station, a reception quality of each of a plurality of wireless carriers whose frequency bands differ from one another, the transmission station performing transmission and reception of data with the receiving station by using the plurality of wireless carriers; and

a processor configured to set a gap to each of the wireless carriers, the gap being a period over which transmission of the data is stopped, and the gap being assigned to each of the wireless carriers by the transmission station in accordance with the reception quality of each of the wireless carriers.

7. A wireless communication system comprising:

a transmission station; and

a receiving station,

wherein the transmission station includes

a first processor configured to obtain reception qualities of a plurality of wireless carriers which are reported from the receiving station that performs transmission and reception of data with the transmission station by using a plurality of wireless carriers whose frequency bands differ from one another, and configured to assign a gap for each of the wireless carriers, in accordance with the obtained reception quality of each of the wireless carriers, the gap being a period over which transmission of the data is stopped, and

wherein the receiving station includes

a second processor configured to set the gap assigned to each of the wireless carriers by the transmission station to each of the wireless carriers.

8. The wireless communication system according to claim 7,

wherein the transmission station further includes a storage that prestores patterns of the plurality of gaps whose cyclic periods or time widths differ from one another, and

wherein the first processor selects, from the storage, the pattern of the gap so that the lower the obtained reception quality of the each of the wireless carriers is, the shorter the cyclic period is or the larger the time width is, and assigns the gap.

9. The wireless communication system according to claim 7, wherein the first processor determines the cyclic periods or time widths of the gap, based on the levels of the obtained reception qualities of the wireless carriers, the gap being assigned to the each of the wireless carriers within a certain time period.

10. The wireless communication system according to claim 7, wherein the first processor sets, for each of the wireless carriers, the number of frequencies to be measured by the receiving station in the corresponding gap in accordance with the obtained reception quality of the each of the wireless carriers, and determines the cyclic period or the time width of the gap that is assigned to the wireless carrier within a certain time period by using the set number of frequencies for the each of the wireless carriers.

11. The wireless communication system according to claim 7, wherein the first processor obtains, as the reception quality of each of the wireless carriers, at least one of a signal power to interference and noise power ratio, a reference signal received quality, a channel quality indicator, and a channel capacity, which are reported from the receiving station.

12. A wireless communication method:

performing transmission and reception of data between a transmission station and a receiving station by using a plurality of wireless carriers whose frequency bands differ from one another;

obtaining, in the transmission station, the reception quality of each of the wireless carriers, the reception quality being reported from the receiving station; and

assigning a gap to each of the wireless carriers, in accordance with the obtained reception quality of the each of the wireless carriers, the gap being a period over which transmission of the data is stopped.

13. The wireless communication method according to claim 12, further comprising:

prestoring patterns of the plurality of gaps whose cyclic periods or time widths differ from one another, and

wherein the assigning including assigning the gap by selecting a pattern from the prestored patterns of the plurality of gaps so that the lower the obtained reception quality of the each of the wireless carriers is, the shorter the cyclic period is or the larger the time width is.

14. The wireless communication method according to claim 12, further comprising:

determining the cyclic periods or time widths of the gaps, based on the levels of the obtained reception qualities of the each of the wireless carriers, the gap being assigned for the each of the wireless carriers within a certain time period are determined.

15. The wireless communication method according to claim 12, further comprising:

setting, for each of the wireless carriers, the number of frequencies to be measured by the receiving station in the corresponding gap in accordance with the reception quality of the each of the wireless carrier; and

determining, the cyclic period or the time width of the gap that is assigned to the wireless carrier within a certain time period by using the set number of frequencies for the each of the wireless carriers.

16. The wireless communication method according to claim 12, further comprising:

obtaining, as the reception quality of each of the wireless carriers, at least one of a signal power to interference and noise power ratio, a reference signal received quality, a channel quality indicator, and a channel capacity, which are reported from the receiving station.