Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Reexamination Certificate
1998-03-03
2002-01-29
Kizou, Hassan (Department: 2662)
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
C370S328000, C370S329000, C370S331000, C370S334000, C370S501000, C370S492000, C455S555000, C455S011100
Reexamination Certificate
active
06342777
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a time division duplex (TDD) portable telephone relay device for relaying a radio telephone line between a radio base station within one radio zone in a TDD portable telephone service area including a plurality of radio zones, and a portable telephone terminal within an electrical signal insensitive region in the radio zone.
More particularly, the present invention relates to the effective use of the line by positively utilizing the TDD portable telephone relay device located in the electrical signal insensitive region.
2. Description of the Related Art
A portable telephone service area includes a plurality of radio zones. When a portable telephone terminal moves from one radio zone to another, a control signal transmit/receive means, which is called a control channel, assigns a utilizing frequency channel to the terminal. When the portable telephone terminal is not in a communicating status and a utilizing frequency channel is not still assigned to the terminal, an exclusive frequency channel predetermined in the portable telephone service area is used as the control channel. When the portable telephone terminal is in a communicating status, the control channel is maintained by means of multiplexing it with the utilizing frequency channel assigned to the terminal. The above two channels are called altogether control channels in the following description.
Currently, a portable telephone relay device is used to enable a portable telephone terminal within a certain radio zone to be used with a high line quality, even in an electrical signal insensitive region at which an electrical signal from a radio base station in the radio zone does not arrive (e.g., is not received due to the nature/characteristics of the region). For example, the electrical signal insensitive region may be found within the interior of a terminal building built in the radio zone, etc. Therefore, such a relay device allows a portable telephone to be used within a building, or other radio frequency shielding structure, in which the portable telephone would otherwise not be capable of communicating with an external base station.
FIG. 4
shows a structure of a conventional portable telephone relay device
2
in relation to a radio base station
14
and a portable telephone terminal
5
.
That is, the portable telephone relay device includes a portable telephone relay device body
2
and transmit/receive antennas
3
and
4
. The device is located in a building which is within a certain radio zone, but in an electrical signal insensitive region at which no electrical signal from a radio base station
14
in the radio zone is received (e.g., a terminal building
1
). The transmit/receive antenna
3
is positioned outside of the terminal building
1
(e.g., on an outer wall of the terminal building
1
), so as to be opposed to the radio base station
14
.
Conversely, the transmit/receive antenna
4
is positioned inside of the terminal building
1
, so as to be opposed to a portable telephone terminal
5
within the terminal building
1
. It is noted that the number of the terminals is not limited to one although only one terminal is shown in FIG.
4
.
The portable telephone relay device body
2
includes an antenna shared unit
6
connected to the transmit/receive antenna
3
, an antenna shared unit
9
connected to the transmit/receive antenna
4
, and a down line (e.g., down-link) amplifier
8
and an up line (e.g., an up-link) amplifier
10
which are connected to a down transmission line and an up transmission line between the antenna shared units
6
and
9
, respectively.
When the portable telephone relay device is located in the terminal building
1
, even if the inside of the terminal building
1
is in an electrical signal insensitive region as described above, a relay device down receive wave (e.g., signal)
21
from the radio base station
14
is received by the transmit/receive antenna
3
outside of the terminal building
1
. An electrical signal corresponding to the relay device down receive wave
21
(e.g., hereinafter referred to as “relay device down receive signal
21
”) is input to the antenna shared unit
6
and is amplified by the down line amplifier
8
. The amplified signal is output to the antenna shared unit
9
and through the transmit/receive antenna
4
to the inside of the terminal building
1
as a relay device down transmit wave (e.g., signal)
22
. Thus, the portable telephone terminal
5
can receive the relay device down transmit signal
22
.
Additionally, a relay device up receive wave (e.g. signal)
23
output from the portable telephone terminal
5
is received by the transmit/receive antenna
4
, and an electrical signal corresponding to the relay device up receive wave
23
(e.g., hereinafter referred to as “relay device up receive signal
23
”) is input through the antenna shared unit
9
and amplified by the up line amplifier
10
. Then, the amplified signal is output to the antenna shared unit
6
and through the transmit/receive antenna
3
to the radio base station
14
as a relay device up transmit signal
24
.
Thus, the portable telephone relay device ensures a high line quality between the portable telephone terminal
5
and the radio base station
14
, even when the portable telephone terminal
5
within the terminal building
1
is in the electrical signal insensitive region (e.g., the interior of terminal building
1
is not substantially in the electrical signal insensitive region).
However, as described above, the conventional portable telephone relay device is designed such that the electrical signal insensitive region, which is within a certain radio zone, is merely changed to a space that provides a line between the portable telephone terminal and the radio base station in the radio zone as in other general regions within the radio zone.
Further, the conventional portable telephone relay device is not designed so as to save frequency channels used in the radio zone by positively considering that the electrical wave insensitive region is a space insulated from the outside of that region with respect to the electrical wave.
Therefore, with a conventional relay device, a call which is initiated outside the building
1
must be terminated and then restarted when entering the building
1
. Hence, the call cannot be continued without interruption from outside the building
1
to inside the building
1
. Similarly, a call which is initiated within the building
1
cannot be continued outside the building because the frequency being used for the telephone call has not been reserved with the external base station
14
.
SUMMARY OF THE INVENTION
In view of the foregoing and other problems of the conventional systems and devices, an object of the present invention is to provide a time division duplex (TDD) portable telephone relay device and a TDD portable telephone system for effectively utilizing the line and also for effectively utilizing a frequency by positively considering that a location where a portable telephone terminal exists is in an electrical wave insensitive region.
To achieve the above and other objects, according to a first aspect of the present invention, there is provided a TDD portable telephone relay device for relaying a telephone line between a radio base station within one radio zone in a TDD system portable telephone service area including a plurality of radio zones and a portable telephone terminal which is within an electrical wave insensitive region in the radio zone, the device including:
a first relay unit for relaying a radio telephone line between the radio base station and the portable telephone terminal within the electrical wave insensitive region in the radio zone of the radio base station, using a radio zone frequency channel of the radio base station; and
a second relay unit, connected to the radio base station through an exclusive wire telephone line, for conducting transmission/reception with respect to the radio base station through th
Kizou Hassan
Kokusai Electric Co. Ltd.
McGinn & Gibb PLLC
Tran Thein
LandOfFree
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