Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2000-03-29
2004-11-09
Urban, Edward F. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S238100, C455S567000
Reexamination Certificate
active
06816731
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to mobile station equipment that is carried on a mobile unit or in a mobile vehicle or carried by a subscriber to offer communications services to the subscriber. The invention also relates to base station equipment for forming a wireless zone in a region where a mobile station can be positioned and providing channel control in the wireless zone. Furthermore, the invention relates to an exchange that associates with this base station equipment and performs call processing. In addition, the invention relates to a mobile communication system composed of such mobile station equipment, base station equipment, and exchange.
2. Description of the Related Art
In recent years, mobile communication systems have become rapidly widespread because of competition among communication service providers and liberalization of the market. Therefore, subscribers receive various kinds of communication services through in-vehicle terminals, as well as through transportable terminals.
FIG. 14
illustrates an example of configuration of a mobile communication system.
In this figure, mobile station equipment
80
is located within a wireless zone
82
formed by radio base station equipment
81
, which is connected with radio control station equipment
83
through a communication link
81
L. An exchange
84
connected with switching networks and home location registers (none of which are shown) is connected with the radio control station equipment
83
through a communication link
84
L.
The mobile station equipment
80
comprises: antennas
85
M-
1
,
85
M-
2
; a TX/RX part
86
M connected with the loading points of these antennas; a processor
87
M having input/output ports connected with the control terminals of the TX/RX part
86
M and with the output of a speedometer (not shown); a microphone
88
and a receiver
89
both connected with the modulation input and demodulation output, respectively, of the TX/RX part
86
M; and a operation/indication part
90
connected with given input/output ports of the processor (CPU)
87
M.
The radio base station equipment
81
comprises: an antenna
85
B; a TX/RX part
86
B connected with the loading point of the antenna
85
B; a transmission path interfacing part
91
B connected with the modulation/demodulation terminal of the TX/RX part
86
B and with one end of the communication link
81
L described above; and a processor (CPU)
87
B, whose input and output ports of the processor
87
B are connected with the control terminals of the TX/RX part
86
B and of the transmission path interfacing part
91
B.
The radio control station equipment
83
comprises a transmission path interfacing part
91
C and an exchange interfacing part
92
both cascaded between the other end of the communication link
81
L and one end of the communication link
84
L, and a processor (CPU)
87
C whose input and output ports are connected with the control terminals of the transmission path interfacing part
91
C and of the exchange interfacing part
92
.
The exchange
84
comprises: a radio interfacing part (RI)
93
directly connected with the other end of the transmission path
84
L; a switch
94
having ports connected with the radio interfacing part
93
and the aforementioned switching networks, respectively; and a processor (CPU)
87
E having communication ports connected with the aforementioned radio interfacing part
93
, the switch
94
, and home location register, respectively.
In the mobile communication system of the construction described so far, the TX/RX part
86
B incorporated in the radio base station equipment
81
forms the wireless zone
82
under control of the processor
87
B and interfaces, through the transmission path interfacing part
91
B, with the communication link
81
L and the radio channel both forming the wireless zone
82
.
In the radio control station equipment
83
, the processor
87
C cooperates with the processor
87
B disposed opposite to the processor
87
C through the transmission path interfacing part
91
C, the communication link
81
L, and the transmission path interfacing part
91
B, and performs channel control of the wireless zone (radio channels).
The transmission path interfacing part
91
C and the exchange interfacing part
92
interface the communication links
81
L and
84
L with each other, based on the procedure of the channel control performed by the processor
87
C in this way.
In the exchange
84
, the processor
87
E performs, by associating with the processor
87
C that is located opposite to the processor
87
E through the radio interfacing part
93
, the communication link
84
L, and the exchange interfacing part
92
, call processing of the following termination call, terminating from the switching networks to the mobile station equipment
80
and the originating calls of the mobile station equipment
80
that are identified by the radio interfacing part
93
.
The call processing adapts to the aforementioned channel control. The originating calls may contain calls for location updating. This call processing contains setting and resetting of a speech path to the switch
94
.
In the mobile station equipment
80
, when a origination request a call containing a phone number is given by the operation/indication part
90
, for example, the processor
87
M transmits an origination call signal to a certain radio channel formed by the radio base station equipment
81
, and performs the channel control by associating associates with the processor
87
B incorporated in the radio base station equipment
81
and with the processor
87
C incorporated in the radio control station equipment
83
.
When the corresponding origination call is completed based on the procedure of the channel control, the TX/RX part
86
M secures a full duplex communication path between the mobile station equipment
80
and the radio base station equipment
81
by matching the speech signal to be sent and received through the microphone
88
and the receiver
89
to the radio channel assigned by the processor
87
C incorporated in the radio control station equipment
83
over the period during which the completed call persists.
The processor
87
M obtains the speed of the local station given by the speedometer described above and judges whether this speed is greater or smaller than a given upper limit.
The processor
87
B recognizes the period for which the speed exceeds the upper limit. During this period, the processor
87
B refrains from performing processing that should be invoked as the aforementioned channel control in response to an origination request given by the operation/indication part
90
and/or a paging signal that is sent by the radio base station equipment
81
and addressed to the local station through the antennas
85
M-
1
,
85
M-
2
, and TX/RX part
86
M. At the same time, the processor
87
B refrains from performing processing associated with location updating that should be invoked based on the procedure of the channel control.
In particular, as long as the upper limit described above is predetermined to a preferable value while the mobile unit or vehicle carrying the mobile station equipment
80
is moving at a high speed, origination calls and response to terminating calls for which the operation/indication part
90
is operated in some manner are restricted. Furthermore, location updating that is a factor of the transition to a state in which a subscriber can perform such operations are permitted is prolonged.
Accordingly, accidents that would normally be caused by user's operation on the mobile station equipment
80
while the mobile station equipment
80
is moving at a high speed are prevented with high reliability.
The TX/RX part
86
M monitors the field strength level of receiving waves that reached the antennas
85
M-
1
,
85
M-
2
from the antenna
85
B incorporated in the radio base station equipment
81
. The TX/RX part
86
M appropriately selects the receiving waves of greater field strength level from those receiving waves and thus maintai
Chow C.
Fujitsu Limited
Katten Muchin Zavis & Rosenman
Urban Edward F.
LandOfFree
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