Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1998-03-26
2001-08-14
Kincaid, Lester G. (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S127500, C455S556200, C455S343200
Reexamination Certificate
active
06275715
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile information apparatus having a radio communication function and, more specifically, to a control method for a data processing section of the mobile information processing apparatus.
2. Description of the Related Art
There has been known mobile information gear which is a combination of an information processing section and a radio communication section. A mobile telephone such as PHS (personal handyphone system) or PDC (personal digital cellular) telephone may be used as the radio communication section to transmit and receive data in TDMA (time division multiple access) communications scheme. During communicating, the radio communication section alternately performs receiving and transmitting operations in frames.
On the other hand, it is desired that the power consumption of a battery-powered apparatus is as low as possible. To achieve the reduced power consumption, a microprocessor operates according to a selected clock frequency depending on a process to be performed because the power consumption increases with the clock frequency.
However, the frame timings of receiving and transmitting operations are not synchronized with the clock change timing of the microprocessor. Therefore, the capacity of a power supply circuit including the battery is designed to cope with the sum of maximum power consumption of the information processing section and the radio communication section. This causes the power supply circuit and the battery to increase in size and weight and thereby the mobile information terminal is prevented from miniaturization.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a mobile information apparatus and a control method therefor which can achieve reduction of power consumption and miniaturization of the mobile information apparatus.
According to the invention, in a combination of an information processing section and a radio communication section, it is checked whether the radio communication section performs radio transmission in a predetermined communication scheme and, when the radio communication section performs the radio transmission, power consumption of the information processing section is restricted within a predetermined level lower than a normal level.
Since the power consumption of the information processing section is restricted within the lower level in the case of transmission, the total power consumption of the information processing section and the radio communication section is also restricted within a power consumption level lower than the maximum power consumption thereof. Therefore, the capacity of a power supply circuit is designed to cope with the sum of maximum power consumption of the radio communication section and the lower power consumption of the information processing section. This causes the power supply circuit and the battery to decrease in size and weight compared with the prior art, resulting in miniaturized mobile information apparatus.
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Kincaid Lester G.
NEC Corporation
Young & Thompson
LandOfFree
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