U.S. patent application number 16/901892 was filed with the patent office on 2020-12-03 for dedicated network handover method, dedicated network type notification method, and device.
The applicant listed for this patent is Huawei Technologies Co., Ltd.. Invention is credited to Longyu Cao, Lin Shu, Fenqin Zhu.
Application Number | 20200383023 16/901892 |
Document ID | / |
Family ID | 1000005021407 |
Filed Date | 2020-12-03 |
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United States Patent
Application |
20200383023 |
Kind Code |
A1 |
Shu; Lin ; et al. |
December 3, 2020 |
Dedicated Network Handover Method, Dedicated Network Type
Notification Method, and Device
Abstract
A dedicated network handover method, a dedicated network type
notification method, and a device, so as to ensure that user
equipment (UE) is handed over to a dedicated core network (CN)
network element of a corresponding CN type in a handover process,
are presented. The CN network element device mainly includes a
receiver configured to receive CN type information of UE sent by a
first dedicated CN network element; a processor configured to
determine, according to the CN type information, identifier
information of a second dedicated CN network element that supports
a CN type indicated by the CN type information; and the processor
configured to hand over, according to the identifier information,
the UE to the second dedicated CN network element corresponding to
the identifier information.
Inventors: |
Shu; Lin; (Shanghai, CN)
; Cao; Longyu; (Shanghai, CN) ; Zhu; Fenqin;
(Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Technologies Co., Ltd. |
Shenzhen |
|
CN |
|
|
Family ID: |
1000005021407 |
Appl. No.: |
16/901892 |
Filed: |
June 15, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15473850 |
Mar 30, 2017 |
10701605 |
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16901892 |
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PCT/CN2014/088002 |
Sep 30, 2014 |
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15473850 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 36/12 20130101;
H04W 88/02 20130101; H04W 36/36 20130101; H04W 88/18 20130101; H04W
88/14 20130101 |
International
Class: |
H04W 36/12 20060101
H04W036/12; H04W 88/14 20060101 H04W088/14; H04W 36/36 20060101
H04W036/36; H04W 88/18 20060101 H04W088/18 |
Claims
1. A network handover method, comprising: sending, by a first
dedicated core network (CN) network element, CN type information,
wherein the first dedicated CN network element is a dedicated CN
network element that provides a service for a source cell in which
a user equipment (UE) is located; receiving, by a core network (CN)
network element, the CN type information from the first dedicated
CN network element; determining, by the CN network element
according to the CN type information, whether the CN network
element itself supports a CN type indicated by the CN type
information; if it is determined the CN network element supports
the CN type, the CN network element provides a service for a target
cell in which the UE is located after a handover is completed; and
handing over, by the CN network element, the UE to the second
dedicated CN network element corresponding to the identifier
information.
2. The method according to claim 1, wherein the method further
comprising: if it is determined the CN network element doesn't
support the CN type, determining, by the CN network element
according to the CN type information, a second dedicated CN network
element that supports the CN type indicated by the CN type
information.
3. The method according to claim 2, wherein the method further
comprising: acquiring, by the CN network element, identifier
information of a third dedicated CN network element that supports
the CN type indicated by the CN type information responsive to
determining, by the CN network element according to the CN type
information, the second dedicated CN network element that supports
the CN type indicated by the CN type information.
4. A communications system for network handover, comprising: a
first dedicated core network (CN) network element, configured to a
first dedicated core network (CN) network element, CN type
information, wherein the first dedicated CN network element is a
dedicated CN network element that provides a service for a source
cell in which a user equipment (UE) is located; and a core network
(CN) network element, configured to: receive the CN type
information from the first dedicated CN network element; determine,
according to the CN type information, whether the CN network
element itself supports a CN type indicated by the CN type
information; provide a service for a target cell in which the UE is
located after a handover is completed if it is determined the CN
network element supports the CN type; and hand over the UE to the
second dedicated CN network element corresponding to the identifier
information.
5. The system according to claim 4, wherein the CN network element,
further configured to: if it is determined the CN network element
doesn't support the CN type, determine, according to the CN type
information, a second dedicated CN network element that supports
the CN type indicated by the CN type information.
6. The system according to claim 5, wherein the CN network element,
further configured to acquire identifier information of a third
dedicated CN network element that supports the CN type indicated by
the CN type information responsive to determining, according to the
CN type information, the second dedicated CN network element that
supports the CN type indicated by the CN type information.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. application Ser.
No. 15/473,850, filed on Mar. 30, 2017, which is a continuation of
International Application No. PCT/CN2014/088002, filed on Sep. 30,
2014. All of the afore-mentioned patent applications are hereby
incorporated by reference in their entireties.
TECHNICAL FIELD
[0002] The present disclosure relates to the field of
communications technologies, and in particular, to a dedicated
network handover method, a dedicated network type notification
method, and a device.
BACKGROUND
[0003] As mobile communication networks evolve and new applications
constantly emerge, users form different communication features in
different application fields, and different mobile communication
types and corresponding user equipment (UE) types are generated,
such as machine type communication (MTC), mobile virtual network
communication, and public safety communication. From a perspective
of a core network (CN) side, different UE types have different
communication requirements, such as different optional feature
support, service feature requirements, availability requirements,
and congestion management mechanisms.
[0004] With a sharp increase of a quantity of UE types, an operator
proposes a requirement that different dedicated CNs are deployed
for the different UE types. The operator subscribes to a dedicated
core network type (CN type) for UE types that have a same
communication feature, deploys dedicated CN network elements such
as a mobility management network element and a data gateway for the
UE types, and registers UE that has a same CN type with a CN
network element that is dedicatedly deployed for the UE, so that
the operator can perform targeted management and maintenance on UE
of different types, and implement dedicated use of a dedicated
network, thereby improving efficiency of mobile management and
session management for access of a huge quantity of UE and reducing
network maintenance costs.
[0005] After UE is successfully registered with a dedicated
network, if the UE is currently in a connected state and leaves a
service area of a current dedicated CN network element because of
movement, a handover procedure needs to be triggered to hand over
the UE to a CN network element in a target cell. According to an
operator requirement for dedicated use of a dedicated network,
because the UE needs to keep being registered with a dedicated CN
of a corresponding CN type as much as possible, the UE should be
handed over to a target CN network element of a same CN type to
meet an operator requirement for performing dedicated network
management on UE of different CN types.
[0006] In a research process, it is found that an existing handover
procedure cannot ensure that the UE in a connected state is handed
over to the target dedicated CN network element of a same CN type
as that of the current dedicated CN network element that serves the
UE, and the operator requirement for performing dedicated network
management on the UE of different CN types cannot be met.
SUMMARY
[0007] Embodiments of the present disclosure provide a dedicated
network type notification method, a dedicated network handover
method, and a device, so as to ensure that UE is handed over to a
dedicated CN network element of a corresponding CN type in a
handover process.
[0008] Specific technical solutions provided in the embodiments of
the present disclosure are as follows.
[0009] According to a first aspect, a CN network element device is
provided, including a receiving module configured to receive CN
type information of UE sent by a first dedicated CN network
element, where the first dedicated CN network element is a
dedicated CN network element that provides a service for a source
cell in which the UE is located in a handover process; a
determining module configured to determine, according to the CN
type information received by the receiving module, identifier
information of a second dedicated CN network element that supports
a CN type indicated by the CN type information, where the second
dedicated CN network element is a dedicated CN network element that
provides a service for a target cell in which the UE is located
after a handover is completed; and a handover module configured to
hand over, according to the identifier information determined by
the determining module, the UE to the second dedicated CN network
element corresponding to the identifier information.
[0010] With reference to the first aspect, in a first possible
implementation, the determining module is configured to determine,
according to a CN type supported by the CN network element device,
whether the CN network element device itself supports the CN type
indicated by the CN type information; and if the CN network element
device itself supports the CN type indicated by the CN type
information, determine that identifier information of the CN
network element device is the identifier information of the second
dedicated CN network element; or if the CN network element device
itself does not support the CN type indicated by the CN type
information, determine, according to the CN type information, the
identifier information of the second dedicated CN network element
that supports the CN type indicated by the CN type information.
[0011] With reference to the first possible implementation of the
first aspect, in a second possible implementation, the determining
module is configured to acquire identifier information of a
dedicated CN network element corresponding to the CN type
information from configuration information, and use the identifier
information of the dedicated CN network element as the determined
identifier information of the second dedicated CN network element
that supports the CN type indicated by the CN type information,
where the configuration information includes a correspondence
between identifier information of at least one dedicated CN network
element that can provide a service for the UE and information about
a supported CN type.
[0012] With reference to the second possible implementation of the
first aspect, in a third possible implementation, the determining
module is further configured to locally acquire the preset
configuration information from the CN network element device; or
the determining module is further configured to, after determining
that the CN network element device does not support the CN type
indicated by the CN type information, perform query on a domain
name server (DNS) to obtain the configuration information.
[0013] With reference to the second possible implementation of the
first aspect, in a fourth possible implementation, the
configuration information includes a correspondence between
identifier information of each dedicated CN network element and
information about a CN type supported by each dedicated CN network
element, where each dedicated CN network element is included in a
resource pool to which the CN network element device belongs.
[0014] With reference to any one of the first aspect to the fourth
possible implementation, in a fifth possible implementation, the
receiving module is configured to receive a forward relocation
request message sent by the first dedicated CN network element,
where the forward relocation request message carries the CN type
information of the UE.
[0015] With reference to the fifth possible implementation of the
first aspect, in a sixth possible implementation, the identifier
information is address information; and the handover module is
configured to forward, according to the address information, the
forward relocation request message to the second dedicated CN
network element corresponding to the address information, so that
the first dedicated CN network element hands over the UE to the
second dedicated CN network element after the second dedicated CN
network element replies a forward relocation response message to
the first dedicated CN network element.
[0016] With reference to the fifth possible implementation of the
first aspect, in a seventh possible implementation, the identifier
information is a unique network element identifier; and the
handover module is configured to send a reroute command to a target
base station, where the reroute command carries the unique network
element identifier and the forward relocation request message, so
that the target base station sends the forward relocation request
message to the second dedicated CN network element corresponding to
the unique network element identifier, and the first dedicated CN
network element hands over the UE to the second dedicated CN
network element after the second dedicated CN network element
replies a forward relocation response message to the first
dedicated CN network element.
[0017] With reference to the seventh possible implementation of the
first aspect, in an eighth possible implementation, the unique
network element identifier is a globally unique mobility management
entity identifier or a network resource identifier.
[0018] According to a second aspect, a dedicated CN network element
device is provided, including an acquiring module configured to
determine a target CN network element that provides a service for a
target cell in which UE is located after a handover is completed,
and acquire CN type information of the UE; and a sending module
configured to send a forward relocation request message to the
target CN network element, where the forward relocation request
message carries the CN type information acquired by the acquiring
module.
[0019] With reference to the second aspect, in a first possible
implementation, the dedicated CN network element device further
includes a receiving module configured to receive a handover
request message that is used for handing over the UE to the target
cell and is sent by a source base station, where the source base
station is a base station that provides a service for a source cell
in which the UE is located in a handover process.
[0020] According to a third aspect, a dedicated network handover
method is provided, including receiving, by a target core network
CN network element, CN type information of UE sent by a first
dedicated CN network element, where the first dedicated CN network
element is a dedicated CN network element that provides a service
for a source cell in which the UE is located in a handover process;
determining, by the target CN network element according to the CN
type information, identifier information of a second dedicated CN
network element that supports a CN type indicated by the CN type
information, where the second dedicated CN network element is a
dedicated CN network element that provides a service for a target
cell in which the UE is located after a handover is completed; and
handing over, by the target CN network element according to the
identifier information, the UE to the second dedicated CN network
element corresponding to the identifier information.
[0021] With reference to the third aspect, in a first possible
implementation, the determining, by the target CN network element
according to the CN type information, identifier information of a
second dedicated CN network element that supports a CN type
indicated by the CN type information includes determining, by the
target CN network element according to a CN type supported by the
target CN network element itself, whether the target CN network
element itself supports the CN type indicated by the CN type
information; and if the target CN network element itself supports
the CN type indicated by the CN type information, determining, by
the target CN network element, that identifier information of the
target CN network element itself is the identifier information of
the second dedicated CN network element; or if the target CN
network element itself does not support the CN type indicated by
the CN type information, determining, by the target CN network
element according to the CN type information, the identifier
information of the second dedicated CN network element that
supports the CN type indicated by the CN type information.
[0022] With reference to the first possible implementation of the
third aspect, in a second possible implementation, the determining,
by the target CN network element according to the CN type
information, identifier information of a second dedicated CN
network element that supports a CN type indicated by the CN type
information includes acquiring, by the target CN network element,
identifier information of a dedicated CN network element
corresponding to the CN type information from configuration
information, and using the identifier information of the dedicated
CN network element as the determined identifier information of the
second dedicated CN network element that supports the CN type
indicated by the CN type information, where the configuration
information includes a correspondence between identifier
information of at least one dedicated CN network element that can
provide a service for the UE and information about a supported CN
type.
[0023] With reference to the second possible implementation of the
third aspect, in a third possible implementation, the configuration
information is preset in the target CN network element; or the
configuration information is obtained by performing query on a DNS
after the target CN network element determines that the target CN
network element itself does not support the CN type indicated by
the CN type information.
[0024] With reference to the second possible implementation of the
third aspect, in a fourth possible implementation, the
configuration information includes a correspondence between
identifier information of each dedicated CN network element and
information about a CN type supported by each dedicated CN network
element, where each dedicated CN network element is included in a
resource pool to which the target CN network element belongs.
[0025] With reference to any one of the third aspect to the fourth
possible implementation, in a fifth possible implementation, the
receiving, by a target core network CN network element, CN type
information of UE sent by a first dedicated CN network element
includes receiving, by the target CN network element, a forward
relocation request message sent by the first dedicated CN network
element, where the forward relocation request message carries the
CN type information of the UE.
[0026] With reference to the fifth possible implementation of the
third aspect, in a sixth possible implementation, the identifier
information is address information; and the handing over, by the
target CN network element according to the identifier information,
the UE to the second dedicated CN network element corresponding to
the identifier information includes forwarding, by the target CN
network element according to the address information, the forward
relocation request message to the second dedicated CN network
element corresponding to the address information, so that the first
dedicated CN network element hands over the UE to the second
dedicated CN network element after the second dedicated CN network
element replies a forward relocation response message to the first
dedicated CN network element.
[0027] With reference to the fifth possible implementation of the
third aspect, in a seventh possible implementation, the identifier
information is a unique network element identifier; and the handing
over, by the target CN network element according to the identifier
information, the UE to the second dedicated CN network element
corresponding to the identifier information includes sending, by
the target CN network element, a reroute command to a target base
station, where the reroute command carries the unique network
element identifier and the forward relocation request message, so
that the target base station sends the forward relocation request
message to the second dedicated CN network element corresponding to
the unique network element identifier, and the first dedicated CN
network element hands over the UE to the second dedicated CN
network element after the second dedicated CN network element
replies a forward relocation response message to the first
dedicated CN network element.
[0028] With reference to the seventh possible implementation of the
third aspect, in an eighth possible implementation, the unique
network element identifier is a globally unique mobility management
entity identifier or a network resource identifier.
[0029] According to a fourth aspect, a dedicated network type
notification method is provided, including determining, by a first
dedicated core network CN network element, a target CN network
element that provides a service for a target cell in which UE is
located after a handover is completed, and acquiring CN type
information of the UE, where the first dedicated CN network element
is a dedicated CN network element that provides a service for a
source cell in which the UE is located in a handover process; and
sending, by the first dedicated CN network element, a forward
relocation request message to the target CN network element, where
the forward relocation request message carries the CN type
information.
[0030] With reference to the fourth aspect, in a first possible
implementation, before the determining, by a first dedicated core
network CN network element, a target CN network element that
provides a service for a target cell in which UE is located, the
method further includes receiving, by the first dedicated CN
network element, a handover request message that is used for
handing over the UE to the target cell and is sent by a source base
station that provides a service for the source cell.
[0031] Based on the foregoing technical solutions, in the
embodiments of the present disclosure, a first dedicated CN network
element notifies a target CN network element of CN type information
of UE, and the target CN network element determines, according to
the CN type information of the UE, a dedicated CN network element
that can support a CN type indicated by the CN type information of
the UE, obtains identifier information of the dedicated CN network
element, uses the identifier information of the dedicated CN
network element as identifier information of a second dedicated CN
network element, and hands over the UE to a corresponding dedicated
CN network element according to the identifier information of the
dedicated CN network element, which ensures that the UE is handed
over, in a handover process, to the dedicated CN network element
that supports the CN type of the UE, and the UE keeps being
registered with a dedicated CN network of the corresponding CN
type, so as to meet an operator requirement for dedicated use of a
dedicated network.
BRIEF DESCRIPTION OF DRAWINGS
[0032] FIG. 1 is a schematic structural diagram of a CN network
element device according to an embodiment of the present
disclosure;
[0033] FIG. 2 is another schematic structural diagram of a CN
network element device according to an embodiment of the present
disclosure;
[0034] FIG. 3 is a schematic structural diagram of a dedicated CN
network element device according to an embodiment of the present
disclosure;
[0035] FIG. 4 is another schematic structural diagram of a
dedicated CN network element device according to an embodiment of
the present disclosure;
[0036] FIG. 5 is a schematic flowchart of a method for notifying a
dedicated network type of UE by a first dedicated CN network
element according to an embodiment of the present disclosure;
[0037] FIG. 6 is a schematic flowchart of a method for handing over
UE between dedicated networks according to an embodiment of the
present disclosure;
[0038] FIG. 7 is a flowchart of performing a dedicated CN network
handover according to an embodiment of the present disclosure;
[0039] FIG. 8 is another flowchart of performing a dedicated CN
network handover according to an embodiment of the present
disclosure; and
[0040] FIG. 9 is another flowchart of performing a dedicated CN
network handover according to an embodiment of the present
disclosure.
DESCRIPTION OF EMBODIMENTS
[0041] To make the objectives, technical solutions, and advantages
of the present disclosure clearer, the following further describes
the present disclosure in detail with reference to the accompanying
drawings. The described embodiments are merely some but not all of
the embodiments of the present disclosure. All other embodiments
obtained by a person of ordinary skill in the art based on the
embodiments of the present disclosure without creative efforts
shall fall within the protection scope of the present
disclosure.
[0042] In the following embodiments, UE may be any one of the
following types, and the UE may be still or moving. The UE may
include but is not limited to: a station, a mobile station, a
subscriber unit, a personal computer, a laptop computer, a tablet
computer, a netbook, a terminal, a cellular phone, a handheld
device, a cordless phone, a personal digital assistant (PDA), a
data card, a universal serial bus (USB) plug-in device, a mobile
WiFi hotspot device (MiFi Devices), a smart watch, smart glasses, a
wireless modem, a wireless router, a wireless local loop (WLL)
station, and the like. The foregoing UE may be distributed in an
entire wireless network.
[0043] In the embodiments of the present disclosure, each UE has a
subscribed UE type, and each UE type is provided with a dedicated
network service by a dedicated CN network element corresponding to
the UE type. A UE type may be referred to as a UE usage type, or a
UE service type, or all other names that may be used to refer to UE
that has a communication feature of a same type, and the name is
used by a CN network element or a base station to select a
dedicated CN network element that serves the UE. A CN type of the
dedicated CN network element is the UE type of the served UE. If a
dedicated CN network element can provide a service for a UE type, a
CN type of the dedicated CN network element is the UE type, and the
CN type of the dedicated CN network element that provides a
dedicated network service for the UE is also referred to as a CN
type of the UE. As can be seen, a CN type and a UE type are
equivalent concepts, and the two concepts may be interchangeably
used.
[0044] For example, if a UE type of UE is "machine type
communication MTC", a CN type of a dedicated CN network element
that provides a service for the UE is "machine type communication
MTC", and a CN type of the UE is "machine type communication
MTC".
[0045] In the following embodiments, for ease of visual
description, a type of a dedicated CN network element is referred
to as a "CN type", but the type of the dedicated CN network element
is a UE type of UE served by the dedicated CN network element, and
is used to refer to UE that has a communication feature of a same
type. A person skilled in the art should understand that by
replacing the CN type in the following embodiments with a UE type,
a UE usage type, a UE service type, or one of all other names that
may be used to refer to the UE that has a communication feature of
a same type, a same solution is obtained, which has an equivalent
protection scope. It should be noted that because a dedicated CN
network element may simultaneously serve multiple UE types, a
dedicated CN network element may have multiple CN types.
[0046] An application scenario of the present disclosure is as
follows: UE is successfully registered with a dedicated CN network
element, and is currently in a connected state, and because the UE
moves out of a service area of the current dedicated CN network
element, a current serving base station requests a source dedicated
CN network element (that is, the current dedicated CN network
element) to trigger a handover procedure to hand over the UE to a
target cell, and a CN type of the UE needs to be notified to a
target CN network element before the handover process is executed,
where the target CN network element is a CN network element that is
selected by the source dedicated CN network element according to a
method for selecting a target CN network element in an existing
handover process and can serve the target cell.
[0047] In the prior art, the source dedicated CN network element
selects a dedicated target CN network element that can serve the CN
type of the UE, that is, the source dedicated CN network element
selects, for the UE in a handover preparation phase, the dedicated
target CN network element that supports the CN type of the UE, and
then hands over the UE to the selected target CN network
element.
[0048] It is found that the following problems exist in a manner
for selecting a dedicated target CN network element by fully
depending on a source dedicated CN network element:
[0049] (1) A typical application scenario of deploying a dedicated
network is a resource pool (Pool) scenario, and for a cross-pool
handover, information about a CN type supported by each CN network
element of all adjacent Pools needs to be configured for each CN
network element of a source Pool, and considering that one Pool may
have multiple adjacent Pools and each Pool may have multiple CN
network elements, the configuration may require heavy workload.
[0050] (2) If a source dedicated CN network element does not
support a Pool feature, but a target cell is located in a Pool, the
source dedicated CN network element can select only one specific CN
network element (for example, a default CN network element) from
the Pool as a target network element, whereas a CN type of the
target CN network element may not match a CN type of UE.
[0051] Accordingly, the embodiments of the present disclosure are
intended to seek a new solution to meet an operator requirement for
performing dedicated network management on UE of different CN
types.
[0052] In the following embodiments, a first dedicated CN network
element is a dedicated CN network element that provides a service
for a source cell in which UE is located in a handover process,
that is, a source dedicated CN network element; a second dedicated
CN network element is a dedicated CN network element that provides
a service for a target cell in which UE is located after a handover
is completed, that is, a target dedicated CN network element; a
source base station is a base station that provides a service for a
source cell in which UE is located in a handover process; and a
target base station is a base station that provides a service for a
target cell in which UE is located after a handover is
completed.
[0053] In a first embodiment of the present disclosure, a CN
network element device is provided, which is configured to
implement a function of a target CN network element. As shown in
FIG. 1, the CN network element device mainly includes a receiving
module 101 configured to receive CN type information of UE sent by
a first dedicated CN network element; a determining module 102
configured to determine, according to the CN type information
received by the receiving module 101, identifier information of a
second dedicated CN network element that supports a CN type
indicated by the CN type information; and a handover module 103
configured to hand over, according to the identifier information
determined by the determining module 102, the UE to the second
dedicated CN network element corresponding to the identifier
information.
[0054] Preferably, the determining module 102 is configured to
determine, according to a CN type supported by the CN network
element device, whether the CN network element device itself
supports the CN type indicated by the CN type information; and if
the CN network element device itself supports the CN type indicated
by the CN type information, determine that identifier information
of the CN network element device is the identifier information of
the second dedicated CN network element; or if the CN network
element device itself does not support the CN type indicated by the
CN type information, determine, according to the CN type
information, the identifier information of the second dedicated CN
network element that supports the CN type indicated by the CN type
information.
[0055] Preferably, the determining module 102 is configured to
acquire identifier information of a dedicated CN network element
corresponding to the CN type information from configuration
information, and use the identifier information of the dedicated CN
network element as the determined identifier information of the
second dedicated CN network element that supports the CN type
indicated by the CN type information, where the configuration
information includes a correspondence between identifier
information of at least one dedicated CN network element that can
provide a service for the UE and information about a supported CN
type.
[0056] In a specific implementation, the determining module 102
locally acquires the preset configuration information from the CN
network element device; or after determining that the CN network
element device does not support the CN type indicated by the CN
type information, the determining module 102 performs query on a
DNS to obtain the configuration information.
[0057] In a specific implementation, if the CN network element
device belongs to a resource pool, the configuration information
includes a correspondence between identifier information of each
dedicated CN network element and information about a CN type
supported by each dedicated CN network element, where each
dedicated CN network element is included in the resource pool to
which the CN network element device belongs.
[0058] Preferably, the receiving module 101 is configured to
receive a forward relocation request message sent by the first
dedicated CN network element, where the forward relocation request
message carries the CN type information of the UE.
[0059] In a specific implementation, the identifier information is
address information; and the handover module 103 is configured to
forward, according to the address information, the forward
relocation request message to the second dedicated CN network
element corresponding to the address information, so that the first
dedicated CN network element hands over the UE to the second
dedicated CN network element after the second dedicated CN network
element replies a forward relocation response message to the first
dedicated CN network element.
[0060] In another specific implementation, the identifier
information is a unique network element identifier; and the
handover module 103 is configured to send a reroute command to a
target base station, where the reroute command carries the unique
network element identifier and the forward relocation request
message, so that the target base station sends the forward
relocation request message to the second dedicated CN network
element corresponding to the unique network element identifier, and
the first dedicated CN network element hands over the UE to the
second dedicated CN network element after the second dedicated CN
network element replies a forward relocation response message to
the first dedicated CN network element.
[0061] If the present disclosure is applied to the fourth
generation mobile telecommunications system, the unique network
element identifier is a globally unique mobility management entity
identifier.
[0062] If the present disclosure is applied to the second or the
third generation mobile telecommunications system, the unique
network element identifier is a network resource identifier.
[0063] In a second embodiment of the present disclosure, another CN
network element device is provided, which is configured to
implement a function of a target CN network element. As shown in
FIG. 2, the CN network element device mainly includes a processor
201, a memory 202, and a transceiver 203 that are connected using a
bus. The processor 201 is configured to acquire a program from the
memory 202, and execute a specific process according to the
program; and the transceiver 203 is configured to receive data and
send the data under the control of the processor 201, which are as
follows: the transceiver 203 is configured to receive CN type
information of UE sent by a first dedicated CN network element; and
the processor 201 is configured to determine, according to the CN
type information received by the transceiver 203, identifier
information of a second dedicated CN network element that supports
a CN type indicated by the CN type information, and hand over,
according to the identifier information, the UE to the second
dedicated CN network element corresponding to the identifier
information.
[0064] Preferably, the processor 201 determines, according to a CN
type supported by the CN network element device, whether the CN
network element device itself supports the CN type indicated by the
CN type information; and if the CN network element device itself
supports the CN type indicated by the CN type information,
determines that identifier information of the CN network element
device is the identifier information of the second dedicated CN
network element; or if the CN network element device itself does
not support the CN type indicated by the CN type information,
determines, according to the CN type information, the identifier
information of the second dedicated CN network element that
supports the CN type indicated by the CN type information.
[0065] Preferably, the processor 201 acquires identifier
information of a dedicated CN network element corresponding to the
CN type information from configuration information, and uses the
identifier information of the dedicated CN network element as the
determined identifier information of the second dedicated CN
network element that supports the CN type indicated by the CN type
information, where the configuration information includes a
correspondence between identifier information of at least one
dedicated CN network element that can provide a service for the UE
and information about a supported CN type.
[0066] Preferably, the processor locally acquires the preset
configuration information from the CN network element device; or
after determining that the CN network element device does not
support the CN type indicated by the CN type information, performs
query on a DNS to obtain the configuration information.
[0067] In a specific implementation, if the CN network element
device belongs to a resource pool, the configuration information
includes a correspondence between identifier information of each
dedicated CN network element and information about a CN type
supported by each dedicated CN network element, where each
dedicated CN network element is included in the resource pool to
which the CN network element device belongs.
[0068] Preferably, the transceiver 203 receives a forward
relocation request message sent by the first dedicated CN network
element, where the forward relocation request message carries the
CN type information of the UE.
[0069] In a specific implementation, the identifier information is
address information; and the processor 201 forwards, according to
the address information, the forward relocation request message to
the second dedicated CN network element corresponding to the
address information, so that the first dedicated CN network element
hands over the UE to the second dedicated CN network element after
the second dedicated CN network element replies a forward
relocation response message to the first dedicated CN network
element.
[0070] In another specific implementation, the identifier
information is a unique network element identifier; and the
processor 201 sends a reroute command to a target base station,
where the reroute command carries the unique network element
identifier and the forward relocation request message, so that the
target base station sends the forward relocation request message to
the second dedicated CN network element corresponding to the unique
network element identifier, and the first dedicated CN network
element hands over the UE to the second dedicated CN network
element after the second dedicated CN network element replies a
forward relocation response message to the first dedicated CN
network element.
[0071] Preferably, if the present disclosure is applied to the
fourth generation mobile telecommunications system, the unique
network element identifier is a globally unique mobility management
entity identifier.
[0072] If the present disclosure is applied to the second or the
third generation mobile telecommunications system, the unique
network element identifier is a network resource identifier.
[0073] In a third embodiment of the present disclosure, a dedicated
CN network element device is provided, which is configured to
implement a function of a source dedicated CN network element. As
shown in FIG. 3, the dedicated CN network element device mainly
includes an acquiring module 301 configured to determine a target
CN network element that provides a service for a target cell in
which UE is located after a handover is completed, and acquire CN
type information of the UE; and a sending module 302 configured to
send a forward relocation request message to the target CN network
element, where the forward relocation request message carries the
CN type information acquired by the acquiring module 301.
[0074] Preferably, the dedicated CN network element device further
includes a receiving module 303 configured to, before the acquiring
module 301 determines the target CN network element that provides a
service for the target cell in which the UE is located, receive a
handover request message that is used for handing over the UE to
the target cell and is sent by a source base station.
[0075] In a fourth embodiment of the present disclosure, another
dedicated CN network element device is provided, which is
configured to implement a function of a source dedicated CN network
element. As shown in FIG. 4, the dedicated CN network element
device mainly includes a processor 401, a memory 402, and a
transceiver 403 that are connected using a bus. The processor 401
is configured to acquire a program from the memory 402, and execute
a specific process according to the program; and the transceiver
403 is configured to receive data and send the data under the
control of the processor 401, which are as follows: the processor
401 is configured to determine a target CN network element that
provides a service for a target cell in which UE is located after a
handover is completed, and acquire CN type information of the UE;
and the transceiver 403 is configured to send a forward relocation
request message to the target CN network element, where the forward
relocation request message carries the CN type information acquired
by the processor 401.
[0076] Preferably, the transceiver 403 is further configured to,
before the processor 401 determines the target CN network element
that provides a service for the target cell in which the UE is
located, receive a handover request message that is used for
handing over the UE to the target cell and is sent by a source base
station.
[0077] In a fifth embodiment of the present disclosure, as shown in
FIG. 5, a detailed method procedure in which a first dedicated CN
network element notifies a dedicated network type of UE is as
follows, including the following steps.
[0078] Step 501: The first dedicated CN network element determines
a target CN network element that provides a service for a target
cell in which the UE is located after a handover is completed, and
acquires CN type information of the UE.
[0079] The target CN network element is selected by the first
dedicated CN network element according to a method for selecting a
target CN network element in an existing handover procedure, and
the target CN network element may not be a dedicated CN network
element whose CN type is consistent with a CN type of the UE.
[0080] Before the first dedicated CN network element determines the
target CN network element that provides a service for the target
cell in which the UE is located after the handover is completed,
the first dedicated CN network element receives a handover request
message that is used for handing over the UE to the target cell and
is sent by a source base station.
[0081] Since the UE is registered with a network in which the first
dedicated CN network element is located, the first dedicated CN
network element stores the CN type information of the UE.
[0082] Step 502: The first dedicated CN network element sends a
forward relocation request message to the target CN network
element, where the forward relocation request message carries the
CN type information of the UE.
[0083] The target CN network element determines, according to the
CN type of the UE, a dedicated CN network element that can support
the CN type, so that the UE keeps being registered with the
dedicated CN network element of the corresponding CN type.
[0084] In a sixth embodiment of the present disclosure, as shown in
FIG. 6, a detailed method procedure in which UE is handed over
between dedicated networks is as follows.
[0085] Step 601: A target CN network element receives CN type
information of UE sent by a first dedicated CN network element.
[0086] Preferably, the target CN network element receives a forward
relocation request message sent by the first dedicated CN network
element, where the forward relocation request message carries the
CN type information of the UE.
[0087] Step 602: The target CN network element determines,
according to the CN type information, identifier information of a
second dedicated CN network element that supports a CN type
indicated by the CN type information.
[0088] Preferably, the target CN network element acquires
identifier information of a dedicated CN network element
corresponding to the CN type information of the UE from
configuration information, and uses the identifier information of
the dedicated CN network element as the determined identifier
information of the second dedicated CN network element that
supports the CN type indicated by the CN type information, where
the configuration information includes a correspondence between
identifier information of at least one dedicated CN network element
that can provide a service for the UE and information about a CN
type supported by the at least one dedicated CN network
element.
[0089] The configuration information includes the correspondence
between the identifier information of the at least one dedicated CN
network element that can provide a service for a location in which
the UE is currently located and the CN type supported by the at
least one dedicated CN network element, and information about the
location in which the UE is currently located may be obtained from
a target cell.
[0090] Preferably, if the target CN network element belongs to a
resource pool, the configuration information includes a
correspondence between identifier information of each dedicated CN
network element and information about a CN type supported by each
dedicated CN network element, where each dedicated CN network
element is included in the resource pool to which the target CN
network element belongs.
[0091] Preferably, the target CN network element determines,
according to a CN type supported by the target CN network element
itself, whether the target CN network element itself supports the
CN type indicated by the CN type information; and if the target CN
network element itself supports the CN type indicated by the CN
type information, the target CN network element determines that
identifier information of the target CN network element itself is
the identifier information of the second dedicated CN network
element; or if the target CN network element itself does not
support the CN type indicated by the CN type information, the
target CN network element determines, according to the CN type
information of the UE, the identifier information of the second
dedicated CN network element that supports the CN type indicated by
the CN type information. When the target CN network element
determines that the target CN network element itself does not
support the CN type indicated by the CN type information, the
target CN network element obtains, from the configuration
information according to the CN type information of the UE, one
piece of the identifier information of the dedicated CN network
element corresponding to the CN type information of the UE, and
uses the piece of the identifier information of the dedicated CN
network element as the identifier information of the second
dedicated CN network element.
[0092] Preferably, a manner for acquiring the configuration
information includes but is not limited to the following two
implementation manners.
[0093] In a first implementation manner, the configuration
information is preset in the target CN network element, and is
directly and locally obtained by the target CN network element.
[0094] In a second implementation manner, the configuration
information is obtained by the target CN network element by
performing query on a DNS after determining that the target CN
network element does not support the CN type indicated by the CN
type information.
[0095] Corresponding to the second implementation manner, a
specific process in which the target CN network element obtains the
configuration information by performing query on the DNS is as
follows.
[0096] When determining that the target CN network element itself
does not support the CN type indicated by the CN type information
of the UE, the target CN network element initiates a query request
to the DNS, where the query request is used to query configuration
information of all dedicated CN network elements that can provide a
service for a location area in which the UE is located. The DNS
returns the configuration information to the target CN network
element according to the query request, where the configuration
information includes correspondences between identifier information
of all the dedicated CN network elements that can provide a service
for the location area in which the UE is located and information
about CN types supported by the dedicated CN network elements.
[0097] Step 603: The target CN network element hands over,
according to the determined identifier information of the second
dedicated CN network element, the UE to the second dedicated CN
network element corresponding to the identifier information.
[0098] In a specific implementation, the determined identifier
information of the second dedicated CN network element may be
address information of the second dedicated CN network element, or
may be a unique network element identifier of the second dedicated
CN network element.
[0099] In a specific implementation, if the determined identifier
information of the second dedicated CN network element is the
address information of the second dedicated CN network element, a
specific process in which the target CN network element hands over
the UE to the dedicated CN network element corresponding to the
determined identifier information of the second dedicated CN
network element is as follows.
[0100] The target CN network element forwards, according to the
determined address information of the second dedicated CN network
element, the forward relocation request message to the second
dedicated CN network element corresponding to the address
information, and the first dedicated CN network element hands over
the UE to the second dedicated CN network element after the second
dedicated CN network element replies a forward relocation response
message to the first dedicated CN network element.
[0101] The second dedicated CN network element sends a handover
request message to a target base station, receives a handover
request acknowledgement message replied by the target base station,
and forwards the forward relocation response message to the first
dedicated CN network element, and the first dedicated CN network
element hands over the UE to the second dedicated CN network
element.
[0102] In another specific implementation, if the determined
identifier information of the second dedicated CN network element
is the unique network element identifier of the second dedicated CN
network element, a specific process in which the target CN network
element hands over the UE to the second dedicated CN network
element corresponding to the determined identifier information of
the second dedicated CN network element is as follows.
[0103] The target CN network element sends a reroute command to a
target base station, where the reroute command carries the
determined unique network element identifier of the second
dedicated CN network element and the forward relocation request
message. The target base station sends the forward relocation
request message to the second dedicated CN network element
corresponding to the unique network element identifier. After the
second dedicated CN network element replies a forward relocation
response message to the first dedicated CN network element, the
first dedicated CN network element hands over the UE to the second
dedicated CN network element corresponding to the unique network
element identifier.
[0104] If the present disclosure is applied to the fourth
generation mobile telecommunications system, the determined unique
network element identifier of the second dedicated CN network
element is a globally unique mobility management entity identifier
of the second dedicated CN network element.
[0105] If the present disclosure is applied to the second or the
third generation mobile telecommunications system, the determined
unique network element identifier of the second dedicated CN
network element is a network resource identifier of the second
dedicated CN network element.
[0106] The following uses three specific embodiments to describe
the dedicated CN network handover process provided in this
embodiment of the present disclosure in detail.
[0107] In actual application, a dedicated CN network element in the
embodiments of the present disclosure may be deployed on a second
generation mobile telecommunications system (2G) network, a third
generation mobile telecommunications system (3G) network, and a 4G
network, and may cover a circuit switched (CS) domain and a packet
switched (PS) domain. For ease of description, the three specific
embodiments are described using only the fourth generation mobile
telecommunications system (4G) as an example, for example, a Long
Term Evolution (LTE) system, and are described using an example in
which the CN network element is a mobility management entity
(MME).
[0108] In a first specific embodiment, as shown in FIG. 7, a
specific process of performing a dedicated CN network handover is
as follows.
[0109] Step 701: UE is successfully registered with a source
dedicated network, and the UE is currently in a connected state,
and because the UE moves out of a service area of a current
dedicated CN network element (a dedicated MME), a source base
station (eNodeB) triggers a handover procedure to hand over the UE
to a target cell, and the source eNodeB sends a handover request
(Handover Required) message to a source dedicated MME.
[0110] Step 702: The source dedicated MME selects, according to a
method for selecting a target MME in an existing handover process,
a target MME that serves the target cell, and sends a forward
relocation request message to the target MME, where the forward
relocation request message carries CN type information of the
UE.
[0111] Because the UE has been registered with the dedicated
network, the CN type information of the UE is stored on the source
dedicated MME.
[0112] Step 703: The target MME first checks whether the target MME
itself can serve a CN type indicated by the CN type information,
that is, whether a CN type supported by the target MME itself is
consistent with the CN type of the UE, and if the CN type supported
by the target MME is consistent with the CN type of the UE, hands
over the UE to the target MME according to a normal handover
procedure; otherwise, determines, according to the CN type
information of the UE, address information of a target dedicated
MME that can provide a service for the UE and supports the CN type
indicated by the CN type information of the UE.
[0113] The target MME acquires address information of a target
dedicated CN network element corresponding to the CN type
information of the UE from configuration information, where the
configuration information includes a correspondence between address
information of at least one dedicated MME that can provide a
service for a location area in which the UE is currently located
and information about a CN type supported by the at least one
dedicated MME.
[0114] If the target MME belongs to an MME resource pool, the
configuration information needs to include a correspondence between
information about a CN type supported by each MME of the Pool and
address information of the MME, so that address information
corresponding to the MME can be determined using the CN type
information.
[0115] Step 704: The target MME forwards the forward relocation
request message to the selected target dedicated MME.
[0116] Step 705: For the selected target dedicated MME, it can be
said that the forward relocation request message is directly
received from the source dedicated MME, and then the selected
target dedicated MME sends a handover request message to a target
eNodeB to request to establish a context and an air interface
bearer resource for the UE; and the target eNodeB replies a
handover request acknowledgement message to the selected target
dedicated MME.
[0117] Step 706: The selected target dedicated MME directly replies
a forward relocation response message to the source dedicated
MME.
[0118] The source dedicated MME continues to execute a subsequent
PS domain handover procedure to hand over the UE to the target
dedicated MME that has the same CN type as that of the UE.
[0119] If the target cell is located in an MME resource pool, the
target MME selects a dedicated MME only from the Pool. If there is
no corresponding dedicated MME in the Pool, the target MME performs
a handover according to the normal handover procedure to hand over
the UE to the target MME, which indicates that the UE enters a cell
that cannot provide a dedicated network service.
[0120] In a second specific embodiment, as shown in FIG. 8, a
specific process of performing a dedicated CN network handover is
as follows.
[0121] Step 801 and step 802 are completely the same as step 701
and step 702 in the foregoing first specific embodiment, and are
not repeated herein.
[0122] Step 803: The target MME first checks whether the target MME
can serve a CN type indicated by the CN type information, that is,
whether a CN type supported by the target MME itself is consistent
with the CN type of the UE, and if the CN type supported by the
target MME is consistent with the CN type of the UE, hands over the
UE to the target MME according to a normal handover procedure;
otherwise, determines, according to the CN type information of the
UE, a target dedicated CN network element that can provide a
service for the UE and supports the CN type of the UE, and executes
step 804.
[0123] A unique network element identifier of a target dedicated
MME corresponding to the CN type information is acquired from
configuration information according to the CN type information of
the UE, where the preset configuration information includes a
correspondence between a unique network element identifier of at
least one dedicated MME that can provide a service for a location
area in which the UE is currently located and information about a
CN type supported by the at least one dedicated MME.
[0124] For a 4G LTE network, the unique network element identifier
is a globally unique MME identifier (GUMMEI); for a 2G/3G network,
the unique network element identifier is a network resource
identifier (NRI).
[0125] It should be noted that an operator needs to configure a
unique network element identifier for each dedicated CN network
element of a deployed dedicated network, where the unique network
element identifier is used to select a corresponding dedicated CN
network element. For example, GUMMEIs of a particular quantity are
reserved for a dedicated MME, and NRIs of a particular quantity are
reserved for a dedicated Serving GPRS Support Node (SGSN).
[0126] Step 804: The target MME initiates a reroute command to a
target eNodeB, where the command carries an allocated GUM MEI of
the target dedicated MME and the forward relocation request message
received from the target dedicated MME.
[0127] Step 805 and step 806: The target eNodeB selects the target
dedicated MME according to the GUMMEI, and forwards the forward
relocation request message to the selected target dedicated
MME.
[0128] Step 807: For the selected target dedicated MME, it can be
said that the forward relocation request message is directly
received from the source dedicated MME, and then the selected
target dedicated MME sends a handover request message to the target
eNodeB to request to establish a context and an air interface
bearer resource for the UE; and the target eNodeB replies a
handover request acknowledgement message to the selected target
dedicated MME.
[0129] Step 808: The selected target dedicated MME directly replies
a forward relocation response message to the source dedicated MME,
and the source dedicated MME continues to execute a subsequent PS
domain handover procedure to hand over the UE to the dedicated MME
that has the same CN type as that of the UE.
[0130] If the target cell is located in an MME resource pool, the
target MME selects a dedicated MME only from the resource pool. If
there is no corresponding dedicated MME in the resource pool, the
target eNodeB sends the forward relocation request message to the
target MME, and the target MME hands over the UE to the target MME
itself according to the normal handover procedure, which indicates
that the UE enters a cell that cannot provide a dedicated network
service.
[0131] In a third specific embodiment, as shown in FIG. 9, a
specific process of performing a dedicated CN network handover is
as follows.
[0132] Step 901 and step 902 are completely the same as step 701
and step 702 in the foregoing first specific embodiment, and are
not repeated herein.
[0133] Step 903: The target MME first checks whether the target MME
can serve a CN type indicated by the CN type information, that is,
whether a CN type supported by the target MME itself is consistent
with the CN type of the UE, and if the CN type supported by the
target MME is consistent with the CN type of the UE, hands over the
UE to the target MME according to a normal handover procedure;
otherwise, the target MME initiates a normal query request to a
DNS, to search for address information of all MMEs that can serve a
location area in which the UE is currently located.
[0134] Step 904: The DNS returns, according to the requested
location area information, list information of a multipurpose
internet mail extension (MIME) that serves the location area, where
in addition to address information of each MME, the list
information includes information about a CN type supported by each
MME.
[0135] Step 905: The target MME matches the CN type information of
the UE with CN type information in the MME list information
returned by the DNS to find address information of an MME that
matches the CN type information of the UE and selects the MME as
the target dedicated MME.
[0136] Step 906: The target MME forwards the forward relocation
request message to the selected target dedicated MME.
[0137] Step 907: For the selected target dedicated MME, it can be
said that the forward relocation request message is directly
received from the source dedicated MME, and then the selected
target dedicated MME sends a handover request message to a target
eNodeB to request to establish a context and an air interface
bearer resource for the UE; and the target eNodeB replies a
handover request acknowledgement message to the selected target
dedicated MME.
[0138] Step 908: The selected target dedicated MME directly replies
a forward relocation response message to the source dedicated MME,
and the source dedicated MME continues to execute a subsequent PS
domain handover procedure to hand over the UE to the selected
target dedicated MME that has the same CN type as that of the
UE.
[0139] If the target cell is located in an MME resource pool, the
target MME selects a dedicated MME only from the resource pool, and
if there is no corresponding dedicated MME in the resource pool,
the target MME performs a handover according to the normal handover
procedure to hand over the UE to the target MME, which indicates
that the UE enters a cell that cannot provide a dedicated network
service.
[0140] Based on the foregoing technical solutions, in the
embodiments of the present disclosure, a first dedicated CN network
element notifies a target CN network element of CN type information
of UE, and the target CN network element determines, according to
the CN type information of the UE, a second dedicated CN network
element that can support a CN type indicated by the CN type
information of the UE, obtains identifier information of the second
dedicated CN network element, and hands over the UE to a
corresponding dedicated CN network element according to the
identifier information of the second dedicated CN network element,
which ensures that the UE is handed over, in a handover process, to
the dedicated CN network element that supports the CN type of the
UE, and the UE keeps being registered with a dedicated CN network
of the corresponding CN type, so as to meet an operator requirement
for dedicated use of a dedicated network.
[0141] A person skilled in the art should understand that the
embodiments of the present disclosure may be provided as a method,
a system, or a computer program product. Therefore, the present
disclosure may use a form of hardware only embodiments, software
only embodiments, or embodiments with a combination of software and
hardware. Moreover, the present disclosure may use a form of a
computer program product that is implemented on one or more
computer-usable storage media (including but not limited to a disk
memory, an optical memory, and the like) that include
computer-usable program code.
[0142] The present disclosure is described with reference to the
flowcharts and/or block diagrams of the method, the device
(system), and the computer program product according to the
embodiments of the present disclosure. It should be understood that
computer program instructions may be used to implement each process
and/or each block in the flowcharts and/or the block diagrams and a
combination of a process and/or a block in the flowcharts and/or
the block diagrams. These computer program instructions may be
provided for a general-purpose computer, a dedicated computer, an
embedded processor, or a processor of any other programmable data
processing device to generate a machine, so that the instructions
executed by a computer or a processor of any other programmable
data processing device generate an apparatus for implementing a
specific function in one or more processes in the flowcharts and/or
in one or more blocks in the block diagrams.
[0143] These computer program instructions may also be stored in a
computer readable memory that can instruct the computer or any
other programmable data processing device to work in a specific
manner, so that the instructions stored in the computer readable
memory generate an artifact that includes an instruction apparatus.
The instruction apparatus implements a specific function in one or
more processes in the flowcharts and/or in one or more blocks in
the block diagrams.
[0144] These computer program instructions may also be loaded onto
a computer or another programmable data processing device, so that
a series of operations and steps are performed on the computer or
the another programmable device, thereby generating
computer-implemented processing. Therefore, the instructions
executed on the computer or the another programmable device provide
steps for implementing a specific function in one or more processes
in the flowcharts and/or in one or more blocks in the block
diagrams.
[0145] Obviously, a person skilled in the art can make various
modifications and variations to the present disclosure without
departing from the scope of the present disclosure. The present
disclosure is intended to cover these modifications and variations
provided that they fall within the scope of protection defined by
the following claims and their equivalent technologies.
* * * * *