Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-05-18
2002-06-11
Bost, Dwayne (Department: 2681)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S343200, C455S552100, C455S426100
Reexamination Certificate
active
06405063
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cordless telephone that can make a call through each of an independent system base station and an outdoor public system base station, and its communication method.
2. Description of the Related Art
In a second generation cordless telephone system, a digital cordless telephone of the system can be registered in advance on each of an outdoor public telephone communication system and an independent (private) telephone communication system to be used as a personal station (mobile station) of both the outdoor public telephone communication system and the independent telephone communication system.
Hereafter, in this specification, the outdoor public telephone communication system is merely referred to as an outdoor public system. The independent telephone communication system is intended to be used as a local facility, such as a home or a business building. Also, it is merely referred to as an independent system. The independent system implies a telephone communication system for the home and the business building.
FIG. 1
is a schematic configuration view showing such a second generation cordless telephone system as a whole. In the example shown in
FIG. 1
, two outdoor public system base stations
104
,
106
are provided in the vicinity of an independent system base station
102
connected to a telephone line
101
. A part of a service area (receiving region)
108
of the independent system base station
102
and a part of a service area
110
of the outdoor public system base station
104
overlap with each other. A service area
112
of the outdoor public system base station
106
does not overlap with the service area
108
, and then overlaps with a part of the service area
110
.
The independent system base station
102
and the outdoor public system base stations
104
,
106
periodically transmit respective control signals. As shown in timing charts of
FIGS. 2A and 2B
, usually, a cordless telephone
114
intermittently receives these control signals
116
,
118
in reception periods TR
1
, TR
2
that are alternately repeated at in a certain period T. In addition, the control signal
116
is a control signal transmitted from the independent system base station
102
, and the control signal
118
is a control signal transmitted from the outdoor public system base station
104
.
The cordless telephone
114
searches the received control signals
116
,
118
to then judge whether or not base station numbers of the independent system and the outdoor public system are included in the control signals
116
,
118
. A state in which the cordless telephone
114
carries out the judgment is referred to as a waiting state. Then, if the base station number of the independent system is included as the judged result, the cordless telephone
114
can make a communication between the cordless telephone
114
and the independent system base station
102
and can make a call through the independent system base station
102
. If the base station number of the outdoor public system is included as the judged result, the cordless telephone
114
can make a communication between it and the outdoor public system base station, and can also make a call through the outdoor public system base station.
As shown in
FIG. 1
, if the cordless telephone
114
exists at a location A, the cordless telephone
114
receives at a time division the control signals from both the independent system base station
102
and the outdoor public system base station
104
to then search the base station numbers of the respective systems in the respective control signals. On the other hand, if the cordless telephone
114
exists at a location B, it can receive only the control signal from the outdoor public system base station
106
, and can not receive the control signal from the independent system base station
102
. Thus, the cordless telephone
114
can make only a call through the outdoor public system base station
106
, since it can not search the base station number of the independent system.
By the way, if the cordless telephone
114
exists outside the service area
108
, the cordless telephone
114
can not make a call through the independent system base station
102
. Thus, it is possible to stop a waiting operation of receiving the control signal from the independent system base station
102
to search the base station number of the independent system base station
102
. Accordingly, it is possible to reduce a consumption power in the cordless telephone
114
and suppress an exhaustion of a power supply battery of the telephone to thereby make a callable time longer.
However, the following trouble is induced if the waiting operation to the independent system is immediately stopped, merely because the cordless telephone
114
exists outside the service area
108
. This trouble is that the call in the independent system can not be made although the cordless telephone
114
exists inside the service area
108
when the cordless telephone
114
exists relatively close to the service area
108
and immediately moves into the service area
108
.
In addition, the following techniques are well known as the cordless telephone.
The following technique is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 7-240966). A cordless telephone has a first synchronizer synchronous with an outdoor public system and a second synchronizer synchronous with a home (independent) system, and is synchronous with the home system inside a service area for the home system, and is synchronous with the public system inside a service area for the public system. Then, it can be automatically switched by an independent/public switch. If the cordless telephone moves from the service area of one system to the service area of the other system, it is automatically synchronous with the system.
The following technique is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 8-79829). When a power supply of a mobile station is turned ON, when a mobile station in the waiting state carries out an outside area detection, or when the mobile station in the waiting state is registered on a public base station adjacent to a home/business facility system, an automatic mode setting manger causes a signal detector from the public base station and a signal detector from the home/business facility base station to detect the signals from the public base station and the home/business facility base station. Then, it sets a mode for a home/business facility mode if there is a communicable home/business facility base station, and sets a mode for a public mode if the home/business facility base station can not make a communication and further there is the communicable public base station, and then establishes an automatic mode setting in which a priority is set for the home/business facility mode and a location registration associated therewith.
The following technique is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 8-172666). Immediately after the mobile station moves inside a reception area of an identification symbol (CS-ID) of an independent radio base station (CS) that can be accessed as a cordless telephone or outside the reception area, an identification symbol (BS-ID) of a public radio base station (BS) that can be accessed as a portable telephone receiving an electric wave is stored in the mobile station as a boundary area. Then, the mobile station automatically switches (1) a cordless telephone mode of waiting an incoming signal from the CS in an area where the CS-ID can be received, (2) a portable telephone mode of waiting an incoming signal from the BS in an area where the BS-ID can be received except a boundary area, and (3) a boundary mode of waiting the incoming signals from both the BS and the CS in an area where the BS-ID of the boundary area can be received.
Moreover, the following technique is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 8-172666). The mobile station can store therein a system call
Bost Dwayne
NEC Corporation
Trinh Sonny
Whitham Curtis & Christofferson, PC
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