Radio communication system

Patent metadata

Field	Value
Publication number	US-9444542-B2
Application number	US-201113179921-A
Country	US
Kind code	B2
Filing date	Jul 11, 2011
Priority date	Jan 20, 2009
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

In a radio communication system a first radio station performs communication by the use of a first radio signal. A second radio station receives a second radio signal which is indistinguishable from the first radio signal. A third radio station is in a radio communication area of the first radio station and a radio communication area of the second radio station. A communication format conversion unit generates a third radio signal by converting a communication format of the second radio signal to a communication format which is distinguishable from the first radio signal, and communicates with the third radio station by the use of the third radio signal.

First claim

What is claimed is:

1. A radio communication system comprising:
a first radio station which performs communication with a mobile station by the use of a first radio signal;
a second radio station; and
a third radio station which communicates with both the first radio station and the second radio station,
wherein:
the second radio station includes a processing unit, the processing unit
receives a second radio signal and converts the second radio signal to a third radio signal;
converts a first communication format type of the second radio signal to a second communication format type of the third radio signal; and
transmits the third radio signal to the third radio station;

wherein
the second radio signal is scrambled by a first scrambling code and the third radio signal is scrambled by a second scrambling code;
the first communication format type and the second communication format type include a cyclic prefix and a data; and
the first communication format type includes a first radio channel, and the second communication format type includes a second radio channel being different from the first radio channel.

2. A radio communication system comprising:
a first base station which communicates with a mobile station by the use of a first radio signal;
a second base station which transmits a second radio signal to a relay node;
the relay node which performs a relay process on the second radio signal; and
the mobile station which communicates with the first base station and the relay node,
wherein:
the relay node includes a processing unit,
the processing unit converts a first communication format type of the second radio signal to a second communication format type of a third radio signal;
and wherein:
the second radio signal scrambled by a first scrambling code and the third radio signal scrambled by a second scrambling code;
the first communication format type and the second communication format type include a cyclic prefix and a data;
the processing unit receives the second radio signal and transmits the third radio signal with the second communication format type to the mobile station; and
the first communication format type includes a first radio channel, and the second communication format type includes a second radio channel being different from the first radio channel.

3. The radio communication system according to claim 2 , wherein when the processing unit converts the first communication format type of the second radio signal to the second communication format type of the third radio signal, the processing unit replaces a redundant portion added to the second radio signal with a redundant portion used in the first radio signal and generates the third radio signal.

4. The radio communication system according to claim 2 , wherein:
the first radio signal is a unicast communication signal and the second radio signal is a broadcast signal; and
the processing unit converts a broadcast format type which is a communication format type of the broadcast signal to a unicast communication format type which is a communication format type of the unicast communication signal, and generates the broadcast signal in the unicast communication format type as the third radio signal.

5. The radio communication system according to claim 4 , wherein the processing unit replaces, at the time of converting the broadcast format to the unicast communication format type, a first redundant portion added to the broadcast signal with a second redundant portion used in the unicast communication signal, and transmits the broadcast signal to which the second redundant portion is added as the third radio signal.

6. The radio communication system according to claim 2 , wherein:
the first radio signal is a broadcast signal and the second radio signal is a unicast communication signal; and
the processing unit converts a unicast communication format type which is a communication format type of the unicast communication signal to a broadcast format type which is a communication format type of the broadcast signal, and generates the unicast communication signal in the broadcast format type as the third radio signal.

7. The radio communication system according to claim 6 , wherein the processing unit replaces, at the time of converting the unicast communication format type to the broadcast format, a first redundant portion added to the unicast communication signal with a second redundant portion used in the broadcast signal, and transmits the unicast communication signal to which the second redundant portion is added as the third radio signal.

8. The radio communication system according to claim 2 , wherein:
the first radio signal is unicast data and the second radio signal is MBMS (Multimedia Broadcast Multicast Service) data; and
the processing unit converts a MBSFN (Multimedia Broadcast multicast service Single Frequency Network) communication format type which is a communication format type of the MBMS data to a unicast communication format type which is a communication format type of the unicast data or a single cell MBMS communication format type, and generates the MBMS data in the unicast communication format type or the single cell MBMS communication format type as the third radio signal.

9. The radio communication system according to claim 8 , wherein the processing unit replaces, at the time of converting the MBSFN communication format type to the unicast communication format type or the single cell MBMS communication format type, an extended CP which is a redundant portion added to data at MBSFN transmission time with a normal CP which is a redundant portion shorter than the extended CP, and transmits the MBMS data to which the normal CP is added as the third radio signal.

10. The radio communication system according to claim 2 , wherein:
the first radio signal is MBMS (Multimedia Broadcast Multicast Service) data and the second radio signal is unicast data or single cell MBMS data; and
the processing unit converts a unicast communication format type which is a communication format type of the unicast data or a single cell MBMS communication format type which is a communication format type of the single cell MBMS data to a MBSFN communication format type which is a communication format type of the MBMS data, and generates the unicast data or the single cell MBMS data in the MBSFN (Multimedia Broadcast multicast service Single Frequency Network) communication format type as the third radio signal.

11. The radio communication system according to claim 10 , wherein the processing unit replaces, at the time of converting the unicast communication format type or the single cell MBMS communication format type to the MBSFN communication format type, a normal CP which is a redundant portion added to data at unicast data or single cell MBMS data transmission time with an extended CP which is a redundant portion longer than the normal CP, and transmits the unicast data or the single cell MBMS data to which the extended CP is added as the third radio signal.

12. The radio communication system according to claim 2 , wherein the second base station transmits the second radio signal to the relay node at a time corresponding to a delay caused by the relay process performed by the relay node.

13. A relay node comprising:
a processing unit configured to receive a first radio signal scrambled by a first scrambling code, and configured to convert a first communication format type of the first radio signal to a second communication format type of a second radio signal, the second radio signal scrambled by a second scrambling code;
wherein
the first communicati

Assignees

• Ode Takayoshi
• Obuchi Kazuhisa
• Fujitsu Ltd

Inventors

• Ode Takayoshi
• Obuchi Kazuhisa

Classifications

• H04W72/30 Primary

  Resource management for broadcast services · CPC title

• H04B7/15557 Primary

  Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode · CPC title

• H04B7/15542

  Selecting at relay station its transmit and receive resources (selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003) · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title