Radio communication apparatus, radio communication system and radio communication method

• US 9,320,081 B2
• Filed: 09/03/2013
• Issued: 04/19/2016
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sugiyama, Jun, Hirata, Shuya, Choraku, Tomohiko
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US14/016,784
• Publication Number:
  US 20140003413A1
• Time in Patent Office: 959 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 92/20 between access points

Abstract

A radio communication apparatus for performing radio communication, including: a first interface conversion unit which extracts a first signal and a second signal multiplexed and input, and corresponding to two different formats, and combines the extracted first and second signal; and a common amplifier which is shared by the first and second signal by amplifying the combined first and second signal, wherein a signal output from the common amplifier is transmitted.

Claims

1. A radio apparatus connectable to a radio control apparatus via a communication link, the radio apparatus comprising:

a receiver configured to receive a first signal corresponding to a first communication format and a second signal corresponding to a second communication format, from the radio control apparatus via the communication link;

a first time-frequency converter configured to convert an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis;

a second time-frequency converter configured to convert an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis;

a combiner configured to combine the first and second signals by deploying and adding the first I signal and Q signal on a frequency axis and the second I signal and Q signal on a frequency axis on a frequency axis and outputs a combined signal including a first frequency corresponding to the first communication format and a second frequency corresponding to the second communication format; and

an amplifier configured to amplify the combined signal including the first and second frequencies.

2. The radio apparatus according to claim 1, wherein the first communication format is W-CDMA (Wideband Code Division Multiple Access), and the second communication format is LTE (Long Term Evolution).

3. A radio control apparatus connectable to a radio apparatus via a communication link, the radio control apparatus comprising:

a first receiver configured to receive a first signal corresponding to a first communication format via a first communication link from a host apparatus;

a second receiver configured to receive a second signal corresponding to a second communication format via a second communication link from another radio control apparatus;

a first time-frequency converter configured to convert an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis;

a second time-frequency converter configured to convert an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis;

a multiplexer configured to perform multiplexing by deploying and adding the first I signal and Q signal on a frequency axis received from the first reception unit and the second I signal and Q signal on a frequency axis received from the second reception unit on a frequency axis; and

a transmitter configured to transmit the multiplexed first and second signals by the multiplex unit to the radio apparatus via communication link.

4. The radio control apparatus according to claim 3, wherein the first communication format is W-CDMA (Wideband Code Division Multiple Access), and the second communication format is LTE (Long Term Evolution).

5. A radio communication method in a base station comprising a radio apparatus connectable to a radio control apparatus via a communication link, the method comprising:

receiving a first signal corresponding to a first communication format and a second signal corresponding to a second communication format, from the radio control apparatus via the communication link, by a reception unit, in the radio control apparatus;

converting an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis, in the radio control apparatus;

converting an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis, in the radio control apparatus;

combining the first I signal and Q signal on a frequency axis and the second I signal and Q signal on a frequency axis by deploying and adding the first and second signals on a frequency axis and outputting a combined signal including a first frequency corresponding to the first communication format and a second frequency corresponding to the second communication format, by a combine unit, in the radio control apparatus; and

amplifying the combined signal including the first and second frequencies, by an amplification unit, in the radio apparatus.

6. The radio communication method according to claim 5, wherein the first communication format is W-CDMA (Wideband Code Division Multiple Access), and the second communication format is LTE (Long Term Evolution).

7. A radio communication method in a base station comprising radio apparatus connectable to a radio control apparatus via a communication link, the method comprising:

receiving a first signal corresponding to a first communication format via a first communication link from a host apparatus, by a first reception unit, in the radio control apparatus;

receiving a second signal corresponding to a second communication format via a second communication link from another radio control apparatus, by a second reception unit, in the radio control apparatus;

converting an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis, in the radio control apparatus;

converting an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis, in the radio control apparatus;

performing multiplexing by deploying and adding the first I signal and Q signal on a frequency axis received from the first reception unit and the second I signal and Q signal on a frequency axis received from the second reception unit on a frequency axis, by a multiplex unit, in the radio control apparatus; and

transmitting the multiplexed first and second signals by the multiplex unit to the radio apparatus via communication link, by a transmission unit, in the radio apparatus.