Repeater

• US 20070060047A1
• Filed: 10/02/2003
• Published: 03/15/2007
• Est. Priority Date: 10/02/2003
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ono, Mitsuhiro
• Application Number:
  US10/570,577
• Publication Number:
  US 20070060047A1
• Time in Patent Office: Days
• US Class Current: 455/11.100
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

A repeater used in a radio communication system and a radio transmission system locally forms in a blind zone a wireless zone in which these systems can be accessed. The repeater is capable of properly allocating a radio resource to a blind zone and a non-blind zone without having a very complex structure. Thus, the repeater has a first monitor unit that monitors a first radio signal received through a radio transmission path, a retransmission unit that retransmits said first radio signal, and a control unit that decreases an output power of the retransmission unit by setting a gain thereof to a small value when said first monitor unit detects a large load of a transmission source of said first radio signal.

Claims

1. A repeater, comprising:

a first monitor unit which monitors a first radio signal received through a radio transmission path;

a retransmission unit which retransmits said first radio signal; and

a control unit which decreases an output power of said retransmission unit by setting of a gain thereof to a small value, when said first monitor unit detects a large load of a transmission source of said first radio signal.

2. The repeater as set forth in claim 1, wherein

when said control unit controls the gain of said retransmission unit so that a signal of a channel on which transmission power is not dynamically controlled is to have a predetermined value, said first monitor unit monitors the first radio signal of which said control unit has made the gain control.

3. The repeater as set forth in claim 1, wherein

said first monitor unit monitors a level of said first radio signal received through an entire band in which occupied band(s) of said first radio signal can be included.

4. The repeater as set forth in claim 1, wherein

said control unit keeps the gain of said retransmission unit at a predetermined value or suspends updating of the gain according to an instruction from an exterior.

5. The repeater as set forth in claim 1, wherein:

said first monitor unit determines whether a reception level of said first radio signal is in a predetermined range; and

said retransmission unit does not retransmit said first radio signal when the reception level of said first radio signal is not in the predetermined range.

6. The repeater as set forth in claim 1, further comprising

a second monitor unit which monitors a received second radio signal, wherein

said control unit decreases an output power of said retransmission unit by setting a gain thereof to a small value, when said second monitor unit detects a high level of said second radio signal.

7. The repeater as set forth in claim 1, further comprising

a relay unit which retransmits, through said radio transmission path, a second radio signal to a transmitting end of said first radio signal at a level which decreases as a reception level of the second radio signal increases.

8. The repeater as set forth in claim 6, wherein

said control unit keeps a gain of said relay unit at a predetermined value or suspends updating of the gain according to an instruction from an exterior.

9. The repeater as set forth in claim 7, wherein:

said second monitor unit determines whether the reception level of said second radio signal is in a predetermined range; and

said relay unit does not retransmit said second radio signal when the reception level of said second radio signal is not in the predetermined range.