Radio communication system

• US 20060092880A1
• Filed: 12/07/2005
• Published: 05/04/2006
• Est. Priority Date: 01/18/1996
• Status: Active Grant

• Current Assignee: Eiji Kamagata, Katsuya Nounin, Kiyoshi Toshimitsu, Mutsumu Serizawa, Nobuyasu Nakajima, Takafumi Sakamoto
• Original Assignee: Eiji Kamagata, Katsuya Nounin, Kiyoshi Toshimitsu, Mutsumu Serizawa, Nobuyasu Nakajima, Takafumi Sakamoto
• Inventors: Serizawa, Mutsumu, Nounin, Katsuya, Toshimitsu, Kiyoshi, Sakamoto, Takafumi, Kamagata, Eiji, Nakajima, Nobuyasu
• Granted Patent: US 7,130,287 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data

Abstract

In a radio communication system having narrow-band up- and down-link radio channels and a wide-band down-link radio channel, when a radio terminal is to receive data thrugh the wide-band down-link rado channel, the narrow-band up- and down-link radio channels are assigned to the radio terminal in advance. With this operation, communication an be performed by using the wide-band down-link radio channel. In addition, the narrow-band up- and down-link radio channels can be used as radio channels for performing control to efficiently trnsmit data by using the wide-band down-link radio channel.

Claims

1-4. -4. (canceled)

5. A radio terminal comprising:

a narrow-band transceiver to transmit/receive data to/from a narrow-band radio base station via a narrow-band communication channel and a wide-band receiver to receive data from a wide-band radio base station via a wide-band communication channel, wherein said narrow-band radio base station has a narrow-band transceiver unit configured to transmit data via a narrow-band communication channel and said wide-band radio base station has a wide band transmitter to transmit data via a wide-band communication channel;

a measuring unit configured to measure a received signal strength indicator of a signal transmitted from the narrow-band radio base station;

a handover performing unit configured to perform handover processing fro the narrow-band radio base station when the measurement result is lower than a predetermined handover threshold level; and

a changing unit configured to change the handover threshold level when data is received from the wide-band radio station.

6. The terminal according to claim 5, wherein the threshold level in the radio terminal is set to be not less than a handover threshold.