Wireless communication apparatus, mobile terminal and wireless communication method

• US 8,355,391 B2
• Filed: 12/27/2011
• Issued: 01/15/2013
• Est. Priority Date: 01/18/2005
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kashiwagi, Hiroki, Hamaguchi, Yasuhiro
• Primary Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US13/337,876
• Publication Number:
  US 20120113924A1
• Time in Patent Office: 385 Days
• Field of Search: 455 61- 62, 455/63.1, 455 68- 69, 455/70, 455/71, 455423-425, 455/434, 455450-451, 4554521-4522, 455/453, 455500-509, 455/522, 455524-526, 455/550.1, 455/556.2, 455/561, 455/42, 455 44- 45, 370/252, 370/281, 370/230, 370/290, 370/295, 370328-330, 370/334, 370343-344, 370349-350, 370/430, 370436-437, 370/465, 370/468, 370/483, 370/474, 370/326, 370/310, 370/313, 370/341, 370536-537, 370/542, 370/916
• US Class Current: 370/344
• CPC Class Codes: H04J 1/00 Frequency-division multiplex systems H04J14/00 takes precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0066 Requirements on out-of-channel emissions
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

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.

Claims

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; and

signal 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; and

demodulating 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; and

signal 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; and

demodulating 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.