Patent EP0984656A2 successfully refreshed from Google Patents.
EP0984656A2
Expired / Lapsed
EP
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Handoff control for point to multipoint connections in mobile ATM networks
Assignee: NEC Corp
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Filing: 1999-02-26
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Granted: —
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Expires: 2019-02-26
Abstract
Abstract Mobile terminal handoff control is provided for point to multipoint (PMP) connections in Mobile ATM networks. Special issues for the handoff control in all three types of PMP connections are taken care of, including cross over switch discovery and handoff path re-routing. A protocol for a PMP connections signaling mechanism is presented, which works with all three types of PMP connections and has a lossless control function. The PMP connection tree topology is protected.
Inventors
- 👤 Jun c/o NEC USA Inc. Li
- 👤 Arup c/o NEC USA Inc. Acharya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:45
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04W; H04W36/00; H04W36/0005; H04W36/0007; H04W72/00; H04W72/30; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5603; H04L2012/5604; H04L2012/5607; H04L2012/5638; H04L2012/564; H04L2012/5642; H04W36/08; H04W8/00; H04W8/005; H04W88/00; H04W88/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
A method for control of a mobile terminal handoff
for a point to multipoint connection in a mobile ATM
network comprising: determining an identity of a new base station having a
respective service area; making a handoff request to a current base station,
along an old virtual circuit, indicating said new base
station; evaluating, at a switching node, said handoff request
to make a determination as to whether said switching node
is an entry border node covering said new base station; when said determination is affirmative, selecting said
switching node as a cross over switch; when said determination is negative, passing said
handoff request upstream; and effecting said handoff under control of said cross
over switch.
Claim 2
Dependent Claim
88 words
The method for control of a mobile terminal
handoff for a point to multipoint connection in a mobile
ATM network as set forth in claim 1, wherein the step of
effecting said handoff includes: setting up at said new base station a new virtual
circuit for said mobile terminal; causing said new base station to buffer cells for said
new virtual circuit; signaling said mobile terminal to participate in said
new virtual circuit; and signaling said new base station to release to said
mobile terminal said buffered cells.
Claim 3
Dependent Claim
89 words
The method for control of a mobile terminal
handoff for a point to multipoint connection in a mobile
ATM network as set forth in claim 2, wherein the step of
effecting said handoff further includes: said step of causing said new base station to buffer
said cells being performed by sending to said new base
station a marker cell; and said step of signaling said mobile terminal to
participate in said new virtual circuit is performed by
sending to said mobile terminal a cell identical to said
marker cell.
Claim 4
Dependent Claim
112 words
A switching node adapted for control of a mobile
terminal handoff for a point to multipoint connection in a
mobile ATM network comprising: a processor, and a memory including software instructions adapted to
enable said processor to cause the switching node to
perform the steps of: receiving a handoff request, along an old virtual
circuit, indicating a new base station for said mobile
terminal; evaluating said handoff request to make a
determination as to whether said switching node is an entry
border node covering said new base station; when said determination is affirmative, effecting
said handoff as a cross over switch; and when said determination is negative, passing said
handoff request upstream.
Claim 5
Dependent Claim
111 words
The switching node adapted for control of a
mobile terminal handoff for a point to multipoint
connection in a mobile ATM network as set forth in claim 4,
wherein said memory further includes software instructions
adapted to enable the switching node further to perform
said effecting of said handoff so as to include the steps
of: causing said new base station to set up a new virtual
circuit for said mobile terminal; causing said new base station to buffer cells for said
new virtual circuit; signaling said mobile terminal to participate in said
new virtual circuit; and signaling said new base station to release to said
mobile terminal said buffered cells.
Claim 6
Dependent Claim
105 words
The switching node adapted for control of a
mobile terminal handoff for a point to multipoint
connection in a mobile ATM network as set forth in claim 5,
wherein said memory further includes software instructions
adapted to enable the switching node further to perform
said effecting of said handoff so that: said step of causing said new base station to buffer
said cells is performed by sending to said new base station
a marker cell; and said step of signaling said mobile terminal to
participate in said new virtual circuit is performed by
sending to said mobile terminal a cell identical to said
marker cell.
Claim 7
Dependent Claim
61 words
The switching node adapted for control of a
mobile terminal handoff for a point to multipoint
connection in a mobile ATM network as set forth in claim 4,
further comprising: a base station transmit and receive unit; and a base station processing unit controlling said base
station transmit and receive unit to receive and send radio
communications with said mobile terminal.
Claim 8
Dependent Claim
123 words
A computer program product for enabling a
processor of a switching node to control handoff of a
mobile terminal for a point to multipoint connection in a
mobile ATM network, comprising: software instructions for enabling the processor to
perform predetermined operations, and a computer readable medium bearing the software
instructions; the predetermined operations including the steps of: receiving a handoff request, along an old virtual
circuit, indicating a new base station for said mobile
terminal; evaluating said handoff request to make a
determination as to whether said switching node is an entry
border node covering said new base station; when said determination is affirmative, effecting
said handoff as a cross over switch; and when said determination is negative, passing said
handoff request upstream.
Claim 9
Dependent Claim
101 words
The computer program product for enabling a
processor of a switching node to control handoff of a
mobile terminal for a point to multipoint connection in a
mobile ATM network according to claim 8, wherein: said effecting of said handoff is performed so as to
include: causing said new base station to set up a new
virtual circuit for said mobile terminal; causing said new base station to buffer cells for
said new virtual circuit; signaling said mobile terminal to participate in
said new virtual circuit; and signaling said new base station to release to
said mobile terminal said buffered cells.
Claim 10
Dependent Claim
87 words
The computer program product for enabling a
processor of a switching node to control handoff of a
mobile terminal for a point to multipoint connection in a
mobile ATM network according to claim 9, wherein: said causing of said new base station to buffer said
cells is performed by sending to said new base station a
marker cell; and said signaling of said mobile terminal to participate
in said new virtual circuit is performed by sending to said
mobile terminal a cell identical to said marker cell.
Claim 11
Dependent Claim
92 words
A mobile radio terminal adapted to operate in a
mobile ATM network, comprising: a processor, and a memory including software instructions adapted to
enable said processor to cause the mobile terminal, when
engaged in a point to multipoint connection, to perform the
steps of: determining an identity of a new base station
having a respective service area; sending a handoff request, along an old virtual
circuit, indicating said new base station; receiving a signaling message over said old
virtual circuit; participating in a new virtual circuit in
response to said signaling message.
Claim 12
Dependent Claim
46 words
The mobile radio terminal adapted to operate in a
mobile ATM network as set forth in claim 11, wherein said
memory further includes software instructions adapted to
enable the said processor further to perform said receiving
step by receiving as said signaling message a marker cell.
Claim 13
Dependent Claim
104 words
A computer program product for enabling a
processor of a mobile terminal to participate in a handoff
operation involving a point to multipoint connection in a
mobile ATM network, comprising: software instructions for enabling the processor to
perform predetermined operations, and a computer readable medium bearing the software
instructions; the predetermined operations including the steps of: determining an identity of a new base station
having a respective service area; sending a handoff request, along an old virtual
circuit, indicating said new base station; receiving a signaling message over said old
virtual circuit; participating in a new virtual circuit in
response to said signaling message.
Claim 14
Dependent Claim
99 words
The computer program product for enabling a
processor of a mobile terminal to participate in a handoff
operation involving a point to multipoint connection in a
mobile ATM network according to claim 13, wherein said
receiving of said signaling message comprises receiving a
marker cell. said step of causing said new base station to buffer
said cells being performed by sending to said new base
station a marker cell; and said step of signaling said mobile terminal to
participate in said new virtual circuit being performed by
sending to said mobile terminal a cell identical to said
marker cell.
Claim 15
Independent Claim
264 words
A method for control of a mobile terminal handoff
for a point to multipoint (PMP) connection in a mobile ATM
network comprising: determining an identity of a new base station having a
respective service area; then sending an initial handoff request message from said
mobile terminal to said new base station via said current
base station; then sending an initial handoff response message from said
new base station to said mobile terminal, via said current
base station, indicating a state of resource availability
at said new base station; then when said initial handoff response message indicates
sufficient resources are available at said new base
station, making a PMP handoff request to a current base
station, along an old virtual circuit, indicating said new
base station; then providing said PMP handoff request to an entry border
node covering said current base station and said new base
station, said entry border node defining a cross over
switch for said transfer; then sending an add party message from said cross over
switch to said new base station; then setting up at said new base station a new virtual
circuit for said mobile terminal in response to said add
party message; then causing said new base station to buffer cells for said
new virtual circuit by sending a marker cell from said
cross over switch to said new base station, and signaling
said mobile terminal to participate in said new virtual
circuit by sending a respective marker cell to said mobile
terminal; and then signaling said new base station to release to said
mobile terminal said buffered cells.
References Cited (Backward Citations)
No citation records indexed.
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