EP0938217A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mobile IP communication scheme using dynamic address allocation protocol
Assignee: Toshiba Corp
•
Filing: 1999-02-19
•
Granted: —
•
Expires: 2019-02-19
Abstract
Abstract A mobile IP communication scheme in which the mobile computer can be operated using the mobile communication protocol such as Mobile IP even in the case where the home network is operated by the dynamic address allocation protocol such as DHCP is disclosed. The current location registration message to be transmitted by the mobile computer from the visited site to the mobile computer management device contains an information indicating that the dynamic address allocation has been received at the home network and an information capable of identifying the mobile computer, and the mobile computer management device carries out exchanges with the dynamic address management server on behalf of the mobile computer, so that the mobile computer which has received the dynamic address allocation at the home network can be operated at the visited site by using the mobile communication protocol.
Inventors
- 👤 Atsushi Inoue
- 👤 Masahiro Ishiyama
- 👤 Atsushi Fukumoto
- 👤 Yoshiyuki Tsuda
- 👤 Toshio Okamoto
- 👤 Masataka Goto
- 👤 Yoshinari Kumaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 14:37
CPC Classifications
H; H04; H04L; H04L61/00; H04L61/50; H04L61/5007; H04L61/5014; H04L61/5046; H04L61/5084; H04L69/00; H04L69/16; H04L69/163; H04W; H04W60/00; H04W60/04; H04W8/00; H04W8/02; H04W8/06; H04W8/26; H04W80/00; H04W80/04; H04W88/00; H04W88/18; H04W88/182
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
183 words
A mobile computer management device for managing a
moving location information of a mobile computer which is
capable of carrying out communications while moving among
inter-connected networks, and transferring packets destined
to the mobile computer to a current location of the mobile
computer, the mobile computer management device comprising: a reception unit for receiving a location registration
message containing a first information on the current
location of the mobile computer, a second information
indicating that the mobile computer has received a dynamic
address allocation at a home network, and a third
information capable of identifying the mobile computer,
from the mobile computer at a visited site outside the home
network; a transmission unit for transmitting a request message
for requesting a re-allocation of a dynamic address
indicated by the third information contained in the
location registration message received by the reception
unit, to an address management server of the home network;
and a response unit for generating a registration response
message reflecting a response to the request message from
the address management server, and returning the
registration response message to the mobile computer.
Claim 2
Dependent Claim
27 words
The mobile computer management device of claim 1,
wherein the third information is a dynamic address
allocated to the mobile computer at the home network before
moving.
Claim 3
Dependent Claim
57 words
The mobile computer management device of claim 1,
wherein the third information is a mobile computer
identifier, and the mobile computer management device
further comprises a unit for retrieving a setting
information of the mobile computer including a dynamic
address allocated to the mobile computer at the home
network before moving, according to the mobile computer
identifier.
Claim 4
Dependent Claim
42 words
The mobile computer management device of claim 1,
wherein the response unit generates the registration
response message containing a code indicating a success of
re-allocation when a re-allocation success is notified from
the address management server in response to the request
message.
Claim 5
Dependent Claim
54 words
The mobile computer management device of claim 1,
wherein the response unit requests an allocation of another
new dynamic address to the address management server and
generates the registration response message containing a
newly allocated dynamic address when a re-allocation
failure is notified from the address management server in
response to the request message.
Claim 6
Dependent Claim
93 words
The mobile computer management device of claim 5,
wherein the response unit judges whether a mobile
communication processing using the another new dynamic
address is to be started at the mobile computer or not when
the re-allocation failure is notified from the address
management server in response to the request message, and
generates the registration response message containing an
error code without requesting the allocation of the another
new dynamic address to the address management server when
the mobile communication processing using the another new
dynamic address is judged not to be started.
Claim 7
Dependent Claim
87 words
The mobile computer management device of claim 1,
further comprising: a proxy processing unit for receiving a message for
requesting not to allocate a dynamic address allocated to
the mobile computer at the home network to another
computer, from the mobile computer before the mobile
computer moves outside the home network, and transmitting a
prescribed message for requesting not to allocate the
dynamic address allocated to the mobile computer at the
home network to another computer for a prescribed period of
time, to the address management server.
Claim 8
Dependent Claim
59 words
The mobile computer management device of claim 1,
further comprising: a processing unit for carrying out a processing to
continually reserving a dynamic address allocated to the
mobile computer at the home network, at least while the
mobile computer which moved outside the home network can be
recognized as carrying out mobile communications via the
mobile computer management device.
Claim 9
Dependent Claim
78 words
The mobile computer management device of claim 1,
further comprising: a processing unit for transmitting a notification
message to notify a correspondence between a name and a new
address of the mobile computer to a name management server
for managing correspondences between names and addresses of
computers, or causing the address management server to
transmit the notification message to the name management
server, when a dynamic address allocated to the mobile
computer at the home network is changed.
Claim 10
Dependent Claim
184 words
A mobile computer management device for managing a
moving location information of a mobile computer which is
capable of carrying out communications while moving among
inter-connected networks, and transferring packets destined
to the mobile computer to a current location of the mobile
computer, the mobile computer management device comprising: a proxy processing unit for receiving a prescribed
message from the mobile computer, and transmitting a
request message for requesting not to allocate a dynamic
address allocated to the mobile computer at the home
network to another computer for a prescribed period of time
to an address management server of the home network; a reception unit for receiving a location registration
message containing information on the current location of
the mobile computer and information capable of identifying
the mobile computer, from the mobile computer at a visited
site outside the home network; and a response unit for returning a response message to
the mobile computer in response to the location
registration message such that the mobile computer can
carry out mobile communications using the dynamic address
allocated to the mobile computer at the home network.
Claim 11
Dependent Claim
158 words
A mobile computer device capable of carrying out
communications while moving among inter-connected networks,
the mobile computer device comprising: a transmission unit for transmitting a location
registration message containing a first information on a
current location of the mobile computer device, a second
information indicating that the mobile computer device has
received a dynamic address allocation at a home network,
and a third information capable of identifying the mobile
computer device, from a visited site outside the home
network to a mobile computer management device provided at
the home network for transferring packets destined to the
mobile computer device to the current location of the
mobile computer device; and a mobile communication setting unit for receiving a
response message returned from the mobile computer
management device which carried out a dynamic address re-allocation
processing in response to the location
registration message, and making a setting for mobile
communications according to a response code contained in
the response message.
Claim 12
Dependent Claim
27 words
The mobile computer device of claim 11, wherein the
third information is a dynamic address allocated to the
mobile computer device at the home network before moving.
Claim 13
Dependent Claim
28 words
The mobile computer device of claim 11, wherein the
third information is a mobile computer identifier by which
the mobile computer management device identifies the mobile
computer device.
Claim 14
Dependent Claim
62 words
The mobile computer device of claim 11, wherein the
mobile communication setting unit starts a mobile
communication processing using a dynamic address allocated
to the mobile computer device at the home network before
moving when the response code indicates a success of the
dynamic address reallocation for the dynamic address
allocated to the mobile computer device at the home network
before moving.
Claim 15
Dependent Claim
49 words
The mobile computer device of claim 11, wherein the
mobile communication setting unit re-initializes a
communication module of the mobile computer device by using
another newly allocated dynamic address when the response
code indicates a failure of the dynamic address re-allocation
and offers the another newly allocated dynamic
address.
Claim 16
Dependent Claim
98 words
The mobile computer device of claim 15, wherein the
mobile communication setting unit judges whether a mobile
communication processing using the another newly allocated
dynamic address is to be started or not when the response
code indicates the failure of the dynamic address re-allocation
and offers the another newly allocated dynamic
address, and transmits a message for refusing the another
newly allocated dynamic address to the mobile computer
management device without re-initializing the communication
module of the mobile computer device when the mobile
communication processing using the another newly allocated
dynamic address is judged not to be started.
Claim 17
Dependent Claim
68 words
The mobile computer device of claim 11, further
comprising: a request unit for transmitting a message for
requesting not to allocate a dynamic address allocated to
the mobile computer device at the home network to another
computer for a prescribed period of time, to an address
management server of the home network or the mobile
computer management device, before the mobile computer
device moves outside the home network.
Claim 18
Dependent Claim
63 words
The mobile computer device of claim 11, wherein the
transmission unit transmits subsequent location
registration messages which indicate that a dynamic address
is used as a home address, regularly to the mobile computer
management device after the mobile communications are
started, such that the mobile computer management device
continually reserve a dynamic address allocated to the
mobile computer device at the home network.
Claim 19
Dependent Claim
136 words
The mobile computer device of claim 11, further
comprising: a judging unit for judging a type of communications to
be carried out as either mobile communications from the
visited site outside the home network through the mobile
computer management device provided at the home network, or
direct communications with a correspondent; and a packet transmission unit for transmitting
transmission packets by entering a dynamic address
allocated to the mobile computer device at the home network
into a source address of the transmission packets when the
judging unit judges that the mobile communications are to
be carried out, or by entering a dynamic address allocated
to the mobile computer device at the visited site network
into a source address of the transmission packets when the
judging unit judges that the direct communications are to
be carried out.
Claim 20
Dependent Claim
146 words
A mobile computer device capable of carrying out
communications while moving among inter-connected networks
which includes a mobile computer management device provided
at a home network of the mobile computer device for
transferring packets destined to the mobile computer device
to a current location of the mobile computer device, the
mobile computer device comprising: a transmission unit for transmitting a message for
requesting not to allocate a dynamic address allocated to
the mobile computer device at the home network to another
computer for a prescribed period of time, to an address
management server of the home network or the mobile
computer management device; and a mobile communication unit for exchanging messages
with the mobile computer management device and carrying out
mobile communications using the dynamic address allocated
to the mobile computer device at the home network, after
the mobile computer device moved outside the home network.
Claim 21
Dependent Claim
164 words
A mobile computer device capable of carrying out
communications while moving among inter-connected networks,
the mobile computer device comprising: a judging unit for judging a type of communications to
be carried out as either mobile communications from a
visited site outside a home network through a mobile
computer management device provided at the home network for
transferring packets destined to the mobile computer device
to a current location of the mobile computer device, or
direct communications with a correspondent; and a packet transmission unit for transmitting
transmission packets by entering a dynamic address
allocated to the mobile computer device at the home network
into a source address of the transmission packets when the
judging unit judges that the mobile communications are to
be carried out, or by entering a dynamic address allocated
to the mobile computer device at the visited site network
into a source address of the transmission packets when the
judging unit judges that the direct communications are to
be carried out.
Claim 22
Dependent Claim
215 words
A mobile computer management method for a
communication system having a mobile computer which is
capable of carrying out communications while moving among
inter-connected networks, and a mobile computer management
device provided at a home network of the mobile computer
for managing a moving location information of the mobile
computer and transferring packets destined to the mobile
computer to a current location of the mobile computer, the
mobile computer management method comprising the steps of: receiving a location registration message containing a
first information on the current location of the mobile
computer, a second information indicating that the mobile
computer has received a dynamic address allocation at a
home network, and a third information capable of
identifying the mobile computer, at the mobile computer
management device from the mobile computer at a visited
site outside the home network; transmitting a request message for requesting a re-allocation
of a dynamic address indicated by the third
information contained in the location registration message
received by the receiving step, from the mobile computer
management device to an address management server of the
home network; and generating a registration response message reflecting
a response to the request message from the address
management server, and returning the registration response
message from the mobile computer management device to the
mobile computer.
Claim 23
Dependent Claim
220 words
A mobile computer management method for a
communication system having a mobile computer which is
capable of carrying out communications while moving among
networks, and a mobile computer management device provided
at a home network of the mobile computer for managing a
moving location information of the mobile computer and
transferring packets destined to the mobile computer to a
current location of the mobile computer, the mobile
computer management method comprising the steps of: receiving at the mobile computer management device a
prescribed message from the mobile computer, and
transmitting from the mobile computer management device a
request message for requesting not to allocate a dynamic
address allocated to the mobile computer at the home
network to another computer for a prescribed period of time
to an address management server of the home network; receiving at the mobile computer management device a
location registration message containing information on the
current location of the mobile computer and information
capable of identifying the mobile computer, from the mobile
computer at a visited site outside the home network; and returning a response message from the mobile computer
management device to the mobile computer in response to the
location registration message such that the mobile computer
can carry out mobile communications using the dynamic
address allocated to the mobile computer at the home
network.
Claim 24
Dependent Claim
178 words
A mobile computer management method for a
communication system having a mobile computer which is
capable of carrying out communications while moving among
networks, and a mobile computer management device provided
at a home network of the mobile computer for transferring
packets destined to the mobile computer to a current
location of the mobile computer, the mobile computer
management method comprising the steps of: transmitting a location registration message
containing a first information on a current location of the
mobile computer, a second information indicating that the
mobile computer has received a dynamic address allocation
at a home network, and a third information capable of
identifying the mobile computer, from the mobile computer a
visited site outside the home network to the mobile
computer management device; and receiving at the mobile computer a response message
returned from the mobile computer management device which
carried out a dynamic address reallocation processing in
response to the location registration message, and making a
setting for mobile communications at the mobile computer
according to a response code contained in the response
message.
Claim 25
Dependent Claim
152 words
A mobile computer management method for a
communication system having a mobile computer which is
capable of carrying out communications while moving among
networks, and a mobile computer management device provided
at a home network of the mobile computer for transferring
packets destined to the mobile computer to a current
location of the mobile computer, the mobile computer
management method comprising the steps of: transmitting from the mobile computer a message for
requesting not to allocate a dynamic address allocated to
the mobile computer at the home network to another computer
for a prescribed period of time, to an address management
server of the home network or the mobile computer
management device; and exchanging messages with the mobile computer
management device and carrying out mobile communications
using the dynamic address allocated to the mobile computer
at the home network, at the mobile computer after the
mobile computer moved outside the home network.
Claim 26
Dependent Claim
159 words
A communication control method for a mobile computer
which is capable of carrying out communications while
moving among networks, the communication control method
comprising the steps of: judging a type of communications to be carried out as
either mobile communications from a visited site outside a
home network through a mobile computer management device
provided at the home network for transferring packets
destined to the mobile computer to a current location of
the mobile computer, or direct communications with a
correspondent; and transmitting transmission packets by entering a
dynamic address allocated to the mobile computer at the
home network into a source address of the transmission
packets when the judging step judges that the mobile
communications are to be carried out, or by entering a
dynamic address allocated to the mobile computer at the
visited site network into a source address of the
transmission packets when the judging step judges that the
direct communications are to be carried out.
Claim 27
Dependent Claim
224 words
A computer usable medium having computer readable
program code means embodied therein for causing a computer
to function as a mobile computer management device for
managing a moving location information of a mobile computer
which is capable of carrying out communications while
moving among inter-connected networks, and transferring
packets destined to the mobile computer to a current
location of the mobile computer, the computer readable
program code means includes: first computer readable program code means for causing
said computer to receive a location registration message
containing a first information on the current location of
the mobile computer, a second information indicating that
the mobile computer has received a dynamic address
allocation at a home network, and a third information
capable of identifying the mobile computer, from the mobile
computer at a visited site outside the home network; second computer readable program code means for
causing said computer to transmit a request message for
requesting a reallocation of a dynamic address indicated
by the third information contained in the location
registration message received by the reception unit, to an
address management server of the home network; and third computer readable program code means for causing
said computer to generate a registration response message
reflecting a response to the request message from the
address management server, and return the registration
response message to the mobile computer.
Claim 28
Dependent Claim
224 words
A computer usable medium having computer readable
program code means embodied therein for causing a computer
to function as a mobile computer management device for
managing a moving location information of a mobile computer
which is capable of carrying out communications while
moving among inter-connected networks, and transferring
packets destined to the mobile computer to a current
location of the mobile computer, the computer readable
program code means includes: first computer readable program code means for causing
said computer to receive a prescribed message from the
mobile computer, and transmit a request message for requesting
not to allocate a dynamic address allocated to the
mobile computer at the home network to another computer for
a prescribed period of time to an address management server
of the home network; second computer readable program code means for
causing said computer to receive a location registration
message containing information on the current
location of the mobile computer and information capable of
identifying the mobile computer, from the mobile computer
at a visited site outside the home network; and third computer readable program code means for causing
said computer to return a response message to the mobile
computer in response to the location registration message
such that the mobile computer can carry out mobile
communications using the dynamic address allocated to the
mobile computer at the home network.
Claim 29
Dependent Claim
191 words
A computer usable medium having computer readable
program code means embodied therein for causing a computer
to function as a mobile computer device capable of carrying
out communications while moving among inter-connected
networks, the computer readable program code means
includes: first computer readable program code means for causing
said computer to transmit a location registration message
containing a first information on a current location of the
mobile computer device, a second information indicating
that the mobile computer device has received a dynamic
address allocation at a home network, and a third
information capable of identifying the mobile computer
device, from a visited site outside the home network to a
mobile computer management device provided at the home
network for transferring packets destined to the mobile
computer device to the current location of the mobile
computer device; and second computer readable program code means for
causing said computer to receive a response message
returned from the mobile computer management device which
carried out a dynamic address re-allocation processing in
response to the location registration message, and make a
setting for mobile communications according to a response
code contained in the response message.
Claim 30
Dependent Claim
180 words
A computer usable medium having computer readable
program code means embodied therein for causing a computer
to function as a mobile computer device capable of carrying
out communications while moving among inter-connected
networks which includes a mobile computer management device
provided at a home network of the mobile computer device
for transferring packets destined to the mobile computer
device to a current location of the mobile computer device,
the computer readable program code means includes: first computer readable program code means for causing
said computer to transmit a message for requesting not to
allocate a dynamic address allocated to the mobile computer
device at the home network to another computer for a
prescribed period of time, to an address management server
of the home network or the mobile computer management
device; and second computer readable program code means for
causing said computer to exchange messages with the mobile
computer management device and carrying out mobile
communications using the dynamic address allocated to the
mobile computer device at the home network, after the
mobile computer device moved outside the home network.
Claim 31
Dependent Claim
206 words
A computer usable medium having computer readable
program code means embodied therein for causing a computer
to function as a mobile computer device capable of carrying
out communications while moving among inter-connected
networks, the computer readable program code means
includes: first computer readable program code means for causing
said computer to judge a type of communications to be
carried out as either mobile communications from a visited
site outside a home network through a mobile computer
management device provided at the home network for
transferring packets destined to the mobile computer device
to a current location of the mobile computer device, or
direct communications with a correspondent; and second computer readable program code means for
causing said computer to transmit transmission packets by
entering a dynamic address allocated to the mobile computer
device at the home network into a source address of the
transmission packets when the first computer readable
program code means judges that the mobile communications
are to be carried out, or by entering a dynamic address
allocated to the mobile computer device at the visited site
network into a source address of the transmission packets
when the first computer readable program code means judges
that the direct communications are to be carried out.
References Cited (Backward Citations)
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