RELAY APPARATUS, COMMUNICATION SYSTEM AND RELAY METHOD

• US 20110097993A1
• Filed: 06/04/2009
• Published: 04/28/2011
• Est. Priority Date: 06/12/2008
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yokomakura, Kazunari, Kubota, Minoru, To, Shimpei, Nakamura, Osamu, Hamaguchi, Yasuhiro
• Application Number:
  US12/997,492
• Publication Number:
  US 20110097993A1
• Time in Patent Office: Days
• US Class Current: 455/7
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

It is aimed to expand a coverage area of a transmission apparatus by relay, while improving spectral efficiency (cell throughput). A relay apparatus for transmitting a signal received from a transmission apparatus to a reception apparatus has a received signal processing section 33 that demodulates a signal received from the transmission apparatus, a selecting section 34 that selects a transmission scheme enabling the reception apparatus to demodulate from among a plurality of transmission schemes, and signal generating sections 35a and 35b that generate a signal used in the transmission scheme selected by the selecting section 34 based on the signal demodulated by the received signal processing section 33.

Claims

1. A relay apparatus for transmitting a signal received from a transmission apparatus to a reception apparatus, comprising:

a received signal processing section that demodulates a signal received from the transmission apparatus;

a selecting section that selects a transmission scheme enabling the reception apparatus to demodulate from among a plurality of transmission schemes; and

a signal generating section that generates a signal used in the transmission scheme selected by the selecting section based on the signal demodulated by the received signal processing section.

2. The relay apparatus according to claim 1, wherein the selecting section selects a transmission scheme with the highest spectral efficiency from among a plurality of transmission schemes enabling the reception apparatus to demodulate.

3. The relay apparatus according to claim 1, wherein the received signal processing section demodulates a single-carrier signal transmitted using consecutive frequencies from the transmission apparatus, and

the transmission signal generating section generates a transmission signal such that a frequency spectrum of a single carrier is assigned to arbitrary frequencies capable of being allocated.

4. The relay apparatus according to claim 1, wherein the signal generating section has a plurality of transmission signal generating sections respectively associated with the plurality of transmission schemes.

6. The communication system comprising:

a relay apparatus according to claim 1;

a base station apparatus; and

a mobile station apparatus,

wherein the base station apparatus and the mobile station apparatus perform radio communication via the relay apparatus.

5. A communication system in which a base station apparatus and a mobile station apparatus perform radio communication via a relay apparatus,

wherein one of the base station apparatus and the mobile station apparatus as a transmission apparatus transmits a signal to the relay apparatus,

the relay apparatus demodulates the signal received from the one of the base station apparatus and the mobile station apparatus as a transmission apparatus, selects a transmission scheme enabling the other one of the base station apparatus and the mobile station apparatus as a reception apparatus to demodulate from among a plurality of transmission schemes, generates a signal used in the selected transmission scheme based on the demodulated signal, and transmits the generated signal to the other one of the base station apparatus and the mobile station apparatus as a reception apparatus, and

the other one of the base station apparatus and the mobile station apparatus as a reception apparatus receives the signal from the relay apparatus.

7. A relay method of a relay apparatus for transmitting a signal received from a transmission apparatus to a reception apparatus, including at least:

receiving a signal from the transmission apparatus;

demodulating the received signal;

selecting a transmission scheme enabling the reception apparatus to demodulate from among a plurality of transmission schemes;

generating a signal used in the selected transmission scheme based on the demodulated signal; and

transmitting the generated signal to the reception apparatus.