Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-09-02
2001-07-03
Vo, Nguyen T. (Department: 2682)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S574000
Reexamination Certificate
active
06256510
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile radio communication apparatus such as a portable telephone and a mobile satellite communication terminal.
2. Description of the Related Art
A mobile radio communication apparatus is usually powered by a battery, and accordingly, in order to increase a time period of operation per one battery, the reduction of the power dissipation is an important issue.
In a prior art mobile radio communication system where two mobile stations communicate with each other, when an intensity of a received signal is large, it is considered that the distance between the two mobile stations is small or the transmission state is good, so that the transmission power is decreased (see JP-A-6-13955). Thus, the transmission power of the radio wave signals transmitted between the mobile stations and can always be minimum, which decreases the power dissipation. This will be explained later in detail.
In the prior art mobile radio communication system, however, in order to decrease the power dissipation, if each of the mobile stations has a burst function for intermittently transmitting signals only when significant transmitting data occurs, the power dissipation is rather increased. That is, even when one of the mobile stations and stops transmitting of signals due to the absence of effective transmitting data, the transmission power control section of the other mobile station continues to increase the transmission power of signals. As a result, the power dissipation is rather increased.
In addition, if each of the mobile stations is a mobile satellite terminal, the antenna of each of the mobile stations should be directed to a satellite. Therefore, when the direction of the antenna of one of the mobile stations is deviated from the satellite, the direction of the antenna should be corrected, however, in the prior art mobile radio communication system, the other mobile station continues to increase the transmission power of signals, which also increases the power dissipation.
SUMMARY OF THE INVENTION
It is an object of the present invention to decrease the power dissipation in a mobile radio communication apparatus where mobile stations intermittently transmit signals, i.e., radio wave signals are transmitted in a burst state.
Another object is to decrease the power dissipation in a mobile radio communication apparatus where the direction of an antenna is deviated from a satellite.
According to the present invention, in a mobile radio communication apparatus including a transmission circuit for intermittently transmitting first significant signals and a reception circuit for receiving second significant signals, a control circuit changes a strength of the first significant signals in accordance with a strength of the second significant signals only when the second significant signals are being received by the reception circuit.
Also, in a mobile radio communication apparatus including a transmission circuit for intermittently transmitting first significant signals and a reception circuit for receiving second significant signals, a control circuit stops transmission of the first significant signals when the strength of the second significant signals is decreased by an amount larger than a predetermined value.
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Japanese Office Action dated Oct. 5, 2000, with partial English translation.
McGinn & Gibb PLLC
Mehrpour N.
NEC Corporation
Vo Nguyen T.
LandOfFree
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