Wireless communication apparatus, mobile terminal and wireless communication method

• US 10,375,697 B2
• Filed: 01/28/2016
• Issued: 08/06/2019
• 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): Nguyen, Steven H
• Application Number:
  US15/009,351
• Publication Number:
  US 20160150521A1
• Time in Patent Office: 1,286 Days
• 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

Provided are a frequency channel allocating section (10) that allocates frequency channels, a terminal reception quality information processing section (6) that calculates an optimal modulation rate and required transmit power for each subcarrier, a subcarrier power control section (12) that controls a level of transmit power for each subcarrier, and a determining section (10) that 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 is a limited band terminal capable of receiving only part of frequencies, and 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 transmitting apparatus configured for transmitting orthogonal frequency division multiplexing (OFDM) signals for communication in a wireless communication system, the transmitting apparatus comprising:

signal generation and transmission components configured to;

generate and transmit OFDM signals by using a part or all of a frequency band comprising more than three frequency channels, wherein each of the more than three frequency channels comprises a plurality of subcarriers,

generate and transmit an OFDM signal to a receiving apparatus that is a limited band apparatus capable of receiving only part of the frequency band and having a reception bandwidth of a number of frequency channels, wherein the OFDM signal is transmitted to the receiving apparatus by using less than or equal to the number of frequency channels, and

allocate (i) the OFDM signal to one or more frequency channels and (ii) no power to a first number of subcarriers at a first edge of the one or more frequency channels and a second number of subcarriers at a second edge of the one or more frequency channels,

wherein the first number of subcarriers and the second number of subcarriers are determined as a function of reception capabilities of the receiving apparatus having the reception bandwidth.

2. The transmitting apparatus of claim 1, further comprising;

one or more signal reception components configured for receiving a signal indicating reception capabilities of the receiving apparatus that is configured for communication in the wireless communication system.

3. The transmitting apparatus of claim 1, wherein the transmitting apparatus comprises a base station.

4. The transmitting apparatus of claim 1, wherein the receiving apparatus comprises a mobile terminal.

5. A method for transmitting performed by a transmitting apparatus configured for transmitting orthogonal frequency division multiplexing (OFDM) signals for communication in a wireless communication system, the method comprising:

generating and transmitting OFDM signals by using a part or all of a frequency band comprising more than three frequency channels, wherein each of the more than three frequency channels comprises a plurality of subcarriers, and

based on a receiving apparatus being a limited band apparatus capable of receiving only part of the frequency band and having a reception bandwidth of a number of frequency channels, generating and transmitting an OFDM signal to the receiving apparatus by using less than or equal to the number of frequency channels; and

allocating (i) the OFDM signal to one or more frequency channels and (ii) no power to a first number of subcarriers at a first edge of the one or more frequency channels and a second number of subcarriers at a second edge of the one or more frequency channels,

wherein the first number of subcarriers and the second number of subcarriers are determined as a function of reception capabilities of the receiving apparatus having the reception bandwidth.

6. The method of claim 5, further comprising;

receiving a signal indicating reception capabilities of the receiving apparatus configured for communication in the wireless communication system.

7. The method of claim 5, wherein the transmitting apparatus comprises a base station.

8. The method of claim 5, wherein the receiving apparatus comprises a mobile terminal.