Electrical computers and digital processing systems: multicomput – Computer-to-computer protocol implementing – Computer-to-computer data framing
Reexamination Certificate
1997-11-12
2001-05-01
Geckil, Mehmet B. (Department: 2152)
Electrical computers and digital processing systems: multicomput
Computer-to-computer protocol implementing
Computer-to-computer data framing
C709S238000, C709S245000, C709S250000
Reexamination Certificate
active
06226681
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a communication terminal and a network unit for use in an information offering system suitably applicable to an ATM network which provides a multicast connection, for example, in an ATM (Asynchronous Transfer Mode), a terminal identifying information setting method, an information offering system, and a fixed-length cell transmitting and receiving unit for use in an information communication system.
(2) Description of the Related Art
FIG. 73
is an illustration of an information offering or distributing system being one example of multimedia services based upon a broadcast mode. In
FIG. 73
, an information offering system, generally designated at numeral
100
, is composed of a service offering unit
101
, an ATM network unit
102
, and a plurality of (two in this case) leaf node units
103
-
1
,
103
-
2
serving as service receiving terminals.
In this system, the service offering unit
101
is connected through a service offering channel
104
to the ATM network unit
102
to transmit desired information through the service offering channel
104
, thus offering a service of giving multimedia information.
Furthermore, the ATM network unit
102
is for relaying information through the service channel
104
between the aforesaid service offering unit
101
and the respective leaf node units
103
-
1
,
103
-
2
, and not only controls a transmission line between the service offering unit
101
and the leaf node units
103
-
1
,
103
-
2
but also manages the service offering operation to the leaf node units
103
-
1
,
103
-
2
.
Still further, the leaf node units
103
-
1
,
103
-
2
function as service receiving terminals which receives, as a service, the information offer from the service offering unit
101
through, for example, the multicast connection.
In more detail, the service offering unit
101
is made up of a service offer processing section
101
a
, an ATM control section
101
b
, a transmission line control section
101
c
, a service control section
101
d
, and a storage section
101
e.
In this arrangement, the service offer processing section
101
a
is for the purpose of outputting signals constituting various kinds of service offer information (for example, multimedia information such as pictures, voices and data), while the ATM control section
101
b
conducts the conversion of various kinds of signals from the service offer processing section
101
a
into ATM cells and the multiprocessing for channels, and further performs the conversion of ATM cells from the transmission line control section
101
c
into various kinds of signals and the extraction thereof.
Furthermore, the transmission line control section
101
c
maps the ATM cell from the ATM control section
101
b
into a transmission signal and further extracts the ATM cell from a transmission signal from the leaf node unit
103
-
1
,
103
-
2
sides.
Still further, the service control section
101
d
serves to control the service offering operation to the leaf node units
103
-
1
,
103
-
2
, whereas the storage section
101
e
acts to register and manage various kinds of information in the service offering unit
101
e
, and is provided with a service channel corresponding data storage section
101
e
-
1
for registering the aforesaid various information with the service offering channel correspondence and manages them.
Moreover, in more detail, the ATM network unit
102
is provided with two transmission line control sections
102
a
,
102
b
, an ATM switch section
102
c
, an ATM switch control section
102
d
, a leaf node control processing section
102
e
, and a storage section
102
f.
The transmission line control section
102
a
conducts the interface processing (for example, the extraction of an ATM cell from a transmission signal, the mapping of an ATM cell into a transmission signal, and others) of a signal between a service offering unit
101
side line or circuit (the service offering channel
104
) and the ATM switch section
102
c.
In a similar way, the transmission line control section
102
b
performs the interface processing of a signal between the leaf node unit
103
-
1
,
103
-
2
side line (the service offering channel
104
) and the ATM switch section
102
c.
The ATM switch section
102
c switches the ATM cell between the aforesaid transmission line control sections
102
a
,
102
b
, while the leaf node control processing section
102
d
manages the leaf node units
103
-
1
,
103
-
2
on the basis of control information it gets from the leaf node units
103
-
1
,
103
-
2
through the transmission line control section
102
b
and the ATM switch section
102
c
, and further produces control information to be transmitted to the leaf node units
103
-
1
,
103
-
2
.
Furthermore, the ATM switch control section
102
d
connects the channel for various services from the service offering unit
101
to the leaf node units
103
-
1
,
103
-
2
in accordance with an instruction the leaf node control processing section
102
e
gives.
Still further, the storage section
102
f
serves to register and manage various information in the ATM network unit
102
, and includes leaf node control data
102
f
-
1
for registering user control information corresponding to the respective leaf node units
103
-
1
,
103
-
2
and ATM switch control data
102
f
-
2
for registering control information for conducting processing to establish connection between the service offering channel
104
and the leaf node units
103
-
1
,
103
-
2
.
Moreover, the leaf node control processing section
102
e
manages user control information, stored with the leaf node control data
102
f
-
1
, on the basis of service control information inputted from the leaf node units
103
-
1
,
103
-
2
.
In this system, each of the leaf node units
103
-
1
,
103
-
2
comprises a transmission line control section
103
a
, an ATM control section
103
b
, a service control section
103
c
, a service instruction section
103
d
, and a storage device
103
e.
The transmission line control section
103
a
extracts an ATM cell from a transmission signal coming from the ATM network unit
102
, and further maps an ATM cell, to be transmitted to the ATM network unit
102
side, into a transmission signal.
Furthermore, the ATM control section
103
b
converts ATM cells from the transmission line control section
103
a
into various signals, and further carries out the conversion of various signals, to be transmitted to the ATM network unit
102
side, into ATM cells.
Still further, the service control section
103
c
recognizes received multimedia information from the ATM control section
103
b
and offers a multimedia service to the user in accordance with the kind of signal.
Moreover, the service instruction section
103
d
converts a demand for a multimedia service set by the user as control information into an ATM cell producing demand and outputs the converted demand to the ATM control section
103
b
. Incidentally, this demand is sent through control channels
106
-
1
,
106
-
2
, provided separately from VPI/VCI of a transmission signal line (the service offering channel
104
), to the leaf node control processing section
102
e
of the ATM network unit
102
.
Still further, the storage section
103
e
registers and manages various information in the leaf node units
103
-
1
,
103
-
2
, and is equipped with a channel data storage section
103
e
-
1
for registering channel information which is in use in the respective leaf node units
103
-
1
,
103
-
2
.
In the information offering system
100
shown in
FIG. 73
, with this arrangement, a multicast connection is established through the ATM network unit
102
between the service offering unit
101
and the leaf node units
103
-
1
,
103
-
2
, which allows the two leaf node units
103
-
1
,
103
-
2
to simultaneously receive the same information offered from the service offering unit
101
.
With the increase in the number of leaf node units
103
-
1
,
103
-
2
getting service offers due to the
Ishigaki Shinichi
Koga Masayuki
Fujitsu Limited
Geckil Mehmet B.
Helfgott & Karas P.C.
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