Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
1998-11-20
2002-09-10
Hsu, Alpus H. (Department: 2665)
Multiplex communications
Diagnostic testing
Fault detection
C370S442000
Reexamination Certificate
active
06449257
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system and method of managing a network state in a mobile radio communication system. In particular, the present invention relates to a network state management system and a network state management method utilizing the system which can compatibly manage the state of a network in which base station controllers and base station transceiver subsystems are linked through a plurality of trunks in a code division multiple access (CDMA) communication system and a personal communication service (PCS) system.
2. Description of the Related Art
Generally, if a certain mobile unit subscriber selects a terminating telephone number and transmits a call signal thereto in a mobile radio communication system, the corresponding base station receives a radio frequency signal transmitted from the originating mobile unit, and calls the terminating mobile unit through a calling channel. At this time, if the terminating mobile unit responds, a speech channel is provided between the two mobile units to achieve call communications. Here, respective base stations repeat the radio communications attempted by a plurality of mobile units located in a predetermined service area. A plurality of base station controllers are provided in a mobile radio communication system, and each base station controller controls a plurality of base stations.
However, in case of performing the call communications utilizing the currently defined communication protocol, a mobile unit may fail to receive a communication control signal transmitted from a base station in a special condition, or the base station may fail to receive the communication control signal transmitted from the mobile unit to the base station in a special condition, resulting in that the call communications between the terminating and originating mobile units may not be performed.
In order to manage such system troubles, a mobile radio communication system is provide with a network state management device. A typical network state management device detects the state of the network in which respective base station controllers or base stations under the control of a base station manager are linked other base stations or base station controllers through a plurality of trunks, outputs the resultant signal to a display device, and outputs an audio alarm to a loudspeaker.
FIG. 1
illustrates a network state management device for managing the trunk link state of the network between a typical base station controller and base station used in a mobile radio communication system.
Referring to
FIG. 1
, a certain base station controller
104
in a mobile radio communication system is connected to a base station
100
through two trunk transmission devices
101
and
102
, and a plurality of trunk lines are connected between the two trunk transmission devices
101
and
102
. Here, the base station controller
104
is provided with a state management processing section
104
a,
and detects whether the link state of the trunks T
1
and T
2
of the corresponding network is in a normal state or in an abnormal state utilizing information sensed by the trunk transmission device
102
by hardware. Specifically, as shown in
FIG. 1
, the trunk transmission device
102
provides the trunk state information
105
a,
which is obtained by sensing the link state of the trunks T
1
and T
2
by hardware, to the state management processing section
104
a
in the base station controller
104
through a separate control line.
Meanwhile, the base station
100
is also provided with a state management processing section
100
a,
and detects whether the link state of the trunks T
1
and T
2
of the corresponding network is in a normal state or in an abnormal state utilizing information sensed by the trunk transmission device
101
by hardware. Specifically, as shown in
FIG. 1
, the trunk transmission device
101
provides the trunk state information
105
b,
which is obtained by sensing the link state of the trunks T
1
and T
2
by hardware, to the state management processing section
100
a
in the base station
100
through a separate control line.
Accordingly, whether a normal routing of the call from the region between the base station controller
104
and the base station
100
to the remote network is possible or not is determined in accordance with the link state information of the corresponding links T
1
and T
2
sensed by hardware by the state management processing section
100
a
of the base station
100
and the state management processing section
104
a
of the base station controller
104
as shown in FIG.
1
.
Also, even in case that a normal routing of the call is performed from the region between the base station controller
104
and the base station
100
to the remote network, the load share with respect to the links T
1
and T
2
should be done. At this time, the normally operable links are identified in accordance with the link state information of the corresponding links T
1
and T
2
sensed by hardware by the state management processing section
100
a
of the base station
100
and the state management processing section
104
a
of the base station controller
104
, and then the normal load share is performed based on the identified result.
However, the conventional network state management device as described above only depends on the state information of the same trunk links T
1
and T
2
connected to the base station controller
104
and the base station
100
which is separately sensed through the respective trunk transmission devices
101
and
102
connected to the base station controller
104
and the base station
100
. Accordingly, the base station controller
104
or the base station
100
determines whether to perform the routing only using the state information of the trunk links T
1
and T
2
provided thereto by hardware. As a result, if the state information of the trunk links T
1
and T
2
currently provided to the base station controller
104
is not consistent with that provided to the base station
100
, serious problems may occur in routing or load share.
For example, we assume that two trunk links T
1
and T
2
exist between the base station controller
104
and the base station
100
via the trunk transmission devices
101
and
102
as shown in
FIG. 1
, the base station controller
104
identifies T
1
and T
2
as normal trunks based on the information provided by hardware, and the base station
100
identifies T
2
only as a normal trunk based on the information provided by hardware. In this case, the base station controller
104
and the base station
100
cannot mutually perform normal data transmission and reception utilizing the trunks T
1
and T
2
. In other words, the base station controller
104
identifies both T
1
and T
2
as the normal trunks and thus attempts to perform the load share with respect to the trunks T
1
and T
2
, but the base station
100
attempts to perform the load share with respect to the trunk T
1
only, resulting in that the normal data transmission and reception cannot be achieved through the two trunks.
As a result, in case of managing the link state of the trunks T
1
and T
2
using the conventional network state management device in a mobile radio communication system, connection of the call for calling the terminating mobile unit may fail, or the call communications between the originating and terminating mobile units in use may be cut off, thereby deteriorating the speech quality of the whole mobile radio communication system.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a system and method of managing the network state in a mobile radio communication system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a system and method of managing the network state in a mobile radio communication system whereby two processors can mutually exchange the state information of bidirectional t
Fleshner & Kim LLP
Ho Duc
Hsu Alpus H.
LG Information & Communications Ltd.
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