Allocating subcarrier channels based on a terminal's bandwidth capacity

• US 8,351,414 B2
• Filed: 12/27/2011
• Issued: 01/08/2013
• 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:
  US13/337,809
• Publication Number:
  US 20120113923A1
• Time in Patent Office: 378 Days
• Field of Search: 455/67.11, 455101-103, 455266-267, 455418-420, 455/422.1, 455/425, 455/434, 4554521-4522, 455/453, 455/504, 455/506, 455/514, 455/522, 455/550.1, 455/552.1, 455/556.2, 455/561, 455/42, 455 44- 45, 455/62, 455/69, 455/70, 455450-451, 455/509, 370/208, 370328-330, 370/334, 370/338, 370/341, 370343-344, 370/395.21, 370/395.41, 370/430, 370468-469, 370/477, 370/236, 370/310, 370/313, 370349-350, 370536-537, 370/542, 370/916, 375/144, 375/148, 375/240, 375/267, 375/299, 375346-348
• 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. An apparatus configured for transmitting orthogonal frequency division multiplexing (OFDM) signals for communication in a wireless communication system, the apparatus comprising:

signal generation and transmission components configured for generating and transmitting an OFDM signal using a first frequency band that includes a plurality of frequency channels;

a determining component configured for determining whether a terminal is a full band terminal configured for receiving the first frequency band or a limited band terminal configured for receiving a limited frequency band comprising a subset of the plurality of frequency channels of the first frequency band, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other; and

wherein, in response to the determination by the determining component that the terminal is the limited band terminal, the signal generation and transmission components are configured to allocate data to the subset of the plurality of frequency channels and allocate no power to at least one adjacent frequency channel of the plurality of frequency channels 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.

2. The apparatus according to claim 1, wherein, in response to the determination that the terminal is the limited band terminal, the signal generation and transmission components are configured to select the subset of the plurality of frequency channels to which the data is allocated based on a reception bandwidth of the terminal.

3. The apparatus according to claim 1, further comprising a storage component configured for storing information indicating whether the terminal is the full band terminal or the limited band terminal.

4. The apparatus according to claim 3, wherein the information indicating whether the terminal is the full band terminal or the limited band terminal is provided by the terminal.

5. The apparatus according to claim 1, wherein the signal generation and transmission components are further configured to:

buffer the data to be transmitted to the terminal; and

transmit the data to the terminal according to at least one prioritization factor, said at least one prioritization factor determining a priority for the data in relation to other data to be transmitted.

6. The apparatus according to claim 5, wherein the at least one prioritization factor comprises information related to whether the data is to be transmitted in real-time or non-real-time.

7. The apparatus according to claim 1, wherein, in response to the determination by the determining component that the terminal is the full band terminal, the signal generation and transmission components are further configured to allocate the data to some or all of the plurality of frequency channels according to reception quality information about the first frequency band.

8. The apparatus according to claim 7, wherein the reception quality information is provided by the full band terminal.

9. The apparatus according to claim 1, wherein the signal generation and transmission components are further configured to generate and transmit OFDM signals representing control data using the first frequency band;

and

wherein the signal generation and transmission components are further configured to allocate the control data 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 can be demodulated and used by the limited band terminal.

10. A method for generating and transmitting orthogonal frequency division multiplexing (OFDM) signals for communication in a wireless communication system, the method comprising:

generating an OFDM signal using a first frequency band that includes a plurality of frequency channels;

determining whether a terminal is a full band terminal configured for receiving the first frequency band or a limited band terminal configured for receiving a limited frequency band comprising a subset of the plurality of frequency channels of the first frequency band, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other;

in response to a determination that the terminal is the limited band terminal, allocating data to the subset of the plurality of frequency channels and allocating no power to at least one adjacent frequency channel of the plurality of frequency channels that is adjacent to the subset of the plurality of frequency channels, 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

transmitting the OFDM signal for reception by the terminal.

11. The method according to claim 10, further comprising the step of, in response to the determination that the terminal is the limited band terminal, selecting the subset of the plurality of frequency channels to which the data is allocated based on a reception bandwidth of the terminal.

12. The method according to claim 10, further comprising the step of storing information indicating whether the terminal is the full band terminal or the limited band terminal.

13. The method according to claim 12, wherein the information indicating whether the terminal is the full band terminal or the limited band terminal is provided by the terminal.

14. The method according to claim 10, further comprising the steps of:

buffering the data to be transmitted to the terminal; and

transmitting the data to the terminal according to at least one prioritization factor, said at least one prioritization factor determining a priority for the data in relation to other data to be transmitted.

15. The method according to claim 14, wherein the at least one prioritization factor comprises information related to whether the data is to be transmitted in real-time or non-real-time.

16. The method according to claim 10, further comprising the step of, in response to a determination that the terminal is the full band terminal, allocating the data to some or all of the plurality of frequency channels according to reception quality information about the first frequency band.

17. The method according to claim 16, wherein the reception quality information is provided by the full band terminal.

18. The method according to claim 10, further comprising the steps of:

generating and transmitting OFDM signals representing control data using the first frequency band; and

allocating the control data 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 can be demodulated and used by the limited band terminal.

19. An apparatus configured for transmitting orthogonal frequency division multiplexing (OFDM) signals for communication in a wireless communication system, the apparatus comprising:

signal generation and transmission components configured for generating and transmitting an OFDM signal using a first frequency band that includes a plurality of frequency channels;

a determining component configured for determining whether a terminal is a full band terminal configured for receiving the first frequency band or a limited band terminal configured for receiving a limited frequency band comprising a subset of the plurality of frequency channels of the first frequency band, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other; and

wherein, in response to a determination by the determining component that the terminal is the limited band terminal, the signal generation and transmission components are configured to allocate data to the subset of the plurality of frequency channels, allocate no power to at least one adjacent frequency channel of the plurality of frequency channels that is adjacent to the subset of the plurality of frequency channels, and allocate control data to at least one second frequency channel of the plurality of frequency channels in such a way that said control data allocated to the at least one second frequency channel can be demodulated and used by the terminal.

20. The apparatus according to claim 19, wherein one frequency channel included in the subset of the plurality of frequency channels is positioned at an edge of the first frequency band.

21. The apparatus according to claim 19, wherein, in response to the determination that the terminal is the limited band terminal, the signal generation and transmission components are configured to select the subset of the plurality of frequency channels to which the control data and the data is allocated based on a reception bandwidth of the terminal.

22. The apparatus according to claim 19, further comprising a storage component configured for storing information indicating whether the terminal is the full band terminal or the limited band terminal.

23. The apparatus according to claim 19, wherein the signal generation and transmission components are further configured to:

buffer the data; and

transmit the data to the terminal according to at least one prioritization factor, said at least one prioritization factor determining a priority for the data in relation to other data to be transmitted.

24. The apparatus according to claim 23, wherein the at least one prioritization factor comprises information related to whether the data is to be transmitted in real-time or non-real-time.

25. The apparatus according to claim 19, wherein, in response to the determination by the determining component that the terminal is the full band terminal, the signal generation and transmission components are further configured to allocate the control data and the data to some or all of the plurality of frequency channels according to reception quality information about the first frequency band.

26. A method for transmitting orthogonal frequency division multiplexing (OFDM) signals for communication in a wireless communication system, the method comprising:

generating and transmitting an OFDM signal using a first frequency band that includes a plurality of frequency channels;

determining whether a terminal is a full band terminal configured for receiving the first frequency band or a limited band terminal configured for receiving a limited frequency band comprising a subset of the plurality of frequency channels of the first frequency band, said subset comprising one of the frequency channels or a plurality of the frequency channels that are adjacent to each other; and

in response to determining that the terminal is the limited band terminal, allocating data to the subset of the plurality of frequency channels, allocating no power to at least one adjacent frequency channel of the plurality of frequency channels that is adjacent to the subset of the plurality of frequency channels, and allocating control data to at least one second frequency channel of the plurality of frequency channels in such a way that said control data allocated to the at least one second frequency channel can be demodulated and used by the terminal.

27. The method according to claim 26, wherein one frequency channel included in the subset of the plurality of frequency channels is positioned at an edge of the first frequency band.

28. The method according to claim 26, further comprising selecting the subset of the plurality of frequency channels to which the control data and the data is allocated based on a reception bandwidth of the terminal.

29. The method according to claim 26, further comprising:

buffering the data; and

transmitting the data to the terminal according to at least one prioritization factor, said at least one prioritization factor determining a priority for the data in relation to other data to be transmitted.

30. The method according to claim 29, wherein the at least one prioritization factor comprises information related to whether the data is to be transmitted in real-time or non-real-time.