Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2000-10-26
2004-06-15
Corsaro, Nick (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S445000, C455S453000, C455S450000, C455S433000
Reexamination Certificate
active
06751478
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to mobile-service switches, a home memory node, and a gateway switch in a mobile communication system of a small zone scheme. Each mobile-service switch incorporates a plurality of processors that cooperate with each other during the course of call processing on a call that has occurred in an individual mobile station and share predetermined loads and functions. The home memory node provides location information of the mobile stations. The gateway switch cooperates with the mobile-service switches and the home memory node and interfaces with a desired network.
2. Description of the Related Art
In mobile communication systems, load distribution and functional distribution are attained by incorporating, in radio base stations, base station controllers, and switch offices, a number of processors that are inexpensive and superior in performance and cooperate with each other and total reliability and flexible adaptation to a variety of forms relating to expansion, maintenance, and operation are secured.
FIG. 17
shows an example configuration of a mobile communication system to which a distributed processing scheme is applied.
As shown in
FIG. 17
, a gateway switch office
60
is connected to a mobile-service switch office
70
via inter-office links
61
-
1
to
61
-N and also connected to a home location register
80
via a communication link
62
. The home location register
80
is connected to corresponding ports of the mobile-service switch office
70
via communication links
81
-
1
to
81
-N. The mobile-service switch office
70
is connected to radio base stations
90
-
1
to
90
-N via respective sets of digital links
71
-
1
to
71
-
1
n
, . . . ,
71
-N
1
to
71
-N
n
. A mobile station
92
is located in, for example, a wireless zone
91
-
3
among wireless zones
91
-
1
to
91
-N that are formed by the respective radio base stations
90
-
1
to
90
-N.
The mobile-service switch office
70
is comprised of the following components (1)-(3):
(1) A main processor (MPR)
72
(
2
) A communication link
73
connected to the communication port of the main processor
72
.
(3) Submodules
74
-
1
to
74
-N that have respective communication ports connected to the main processor
72
via the communication link
73
and that are connected to the respective inter-office links
61
-
1
to
61
-N, the respective communication links
81
-
1
to
81
-N, and the respective sets of digital links
71
-
11
to
71
-
1
n
, . . . ,
71
-N
1
to
71
-N
n.
The submodule
74
-
1
is composed of the following components (a)-(e):
(a) A switch module
75
-
1
(b) a call processor (CPR)
76
-
1
having a port that is connected to the control terminal of the switch module
75
-
1
and the above-mentioned communication port that is connected to the communication link
73
.
(c) A digital trunk (DT)
77
G-
1
that is directly connected to the inter-office link
61
-
1
and is connected to one, of the ports of the switch module
75
-
1
, corresponding to the inter-office link
61
-
1
.
(d) A digital trunk (DT)
77
H-
1
that is directly connected to the communication link
81
-
1
and is connected to one, of the ports of the switch module
75
-
1
, corresponding to the communication link
81
-
1
.
(e) Digital trunks (DTs)
77
B-
11
to
77
B-
1
n
that are directly connected to the respective digital links
71
-
11
to
71
-
1
n
and are connected to ones, of the ports of the switch module
75
-
1
, corresponding to the respective digital links
71
-
11
to
71
-
1
n.
Since the submodules
74
-
2
to
74
-N have the same configuration as the submodule
74
-
1
, they are not illustrated in detail in FIG.
17
and will not be described. The components of the submodules
74
-
2
to
74
-N will be given the same reference symbols as the corresponding components of the submodule
74
-
1
except that the reference symbols will have first suffixes “2” to “N.”
In the mobile communication system having the above configuration, the home location register
80
has a database in which combinations of a subscriber number, an identifier, and a switch identification number MSCID (described below) are registered.
Unique subscriber numbers that are given to respective mobile stations (including the above-mentioned mobile station
92
) each of which is located in one of the wireless zones
91
-
1
to
91
-N.
Identifiers acquired for the respective mobile stations according to a predetermined channel control procedure and that indicate, among the wireless zones
91
-
1
to
91
-N, wireless zones (hereinafter referred to as “visit-zones”) where the respective mobile stations actually exist.
Unique switch identification numbers MSCIDs given to mobile-service switch offices each of which is connected to the gateway switch office
60
via its outgoing lines and is to perform call set-up in cooperation with a radio base station that forms the visit-zone.
A scheme of location registration for updating the contents of the database and a procedure of channel control performed during the course of the location registration through cooperation among the individual sections are not important features of the invention and can be realized by using various known techniques, and hence they will not be described.
In the mobile-service switch office
70
, the main processor
72
cooperates with the call processors
76
-
1
to
76
-N according to predetermined procedures of call set-up and channel control in such a manner as to exchange messages with the call processors
76
-
1
to
76
-N.
In the submodule
74
-
1
, the call processor
76
-
1
has the initiative of setting and canceling a speech path to be formed in the switch module
75
-
1
according to the above-mentioned procedures of call set-up and channel control. Further, the call processor
76
-
1
forms, as fixed pseudo-speech paths, in the switch module
75
-
1
, communication links (not shown) for exchange of messages between the call processor
76
-
1
and the digital trunks
77
G-
1
,
77
H-
1
, and
77
B-
11
to
77
B-
1
n.
The digital trunks
77
G-
1
,
77
H-
1
, and
77
B-
11
to
77
B-
1
n
relay the following messages:
A message to be exchanged with the gateway switch office
60
via the inter-office link
61
-
1
.
A message to be exchanged with the home location register
80
via the communication link
81
-
1
.
A message to be exchanged with the radio base station
90
-
1
via the digital links
77
-
11
to
77
-
1
n.
Operations of the individual sections of the submodules
74
-
2
to
74
-N are the same as those of the individual sections of the submodule
74
-
1
and hence will not be described.
When recognizing a call that has been forwarded to the local station via an incoming line (not shown) (indicated by symbol (
1
) in FIG.
18
), the gateway switch office
60
judges whether the destination party is a mobile station that can be located in any of the wireless zones
91
-
1
to
91
-N by performing code translation on the call (step (
1
) in FIG.
19
). When the judgment result is true, the gateway switch office
60
acquires a subscriber number ID of this mobile station (for the sake of simplicity, it is assumed to be the mobile station
92
) (step (
2
) in FIG.
19
).
Then, the gateway switch office
60
generates a location request including the subscriber number ID and sends the generated location request to the home location register
80
via the communication link
62
(indicated by symbol (
2
) in
FIG. 18
; step (
3
) in FIG.
19
).
The home location register
80
acquires, from the above-mentioned database, a visit-zone identifier (hereinafter referred to simply as “location information”) and a switch identification number MSCID that constitutes the combination (mentioned above) together with the subscriber number ID included in the location request (indicated by symbol (
3
) in
FIG. 18
; step (
1
) in FIG.
20
).
Then, the home location register
80
sends a routing request including the subscriber number ID and the location information to the mobile-service sw
Iseyama Takayuki
Sakai Kenichiro
Corsaro Nick
Fujitsu Limited
Katten Muchin Zavis & Rosenman
Lee John F
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