U.S. patent application number 16/208833 was filed with the patent office on 2019-06-27 for apparatus and method for acquisition of fast multi-channel data based on lorawan.
This patent application is currently assigned to Pusan National University Industry-University Cooperation Foundation. The applicant listed for this patent is Pusan National University Industry-University Cooperation Foundation. Invention is credited to Junhwan HUH, Donghyun KIM, Jongdeok KIM, Jaeho SHIN.
Application Number | 20190200390 16/208833 |
Document ID | / |
Family ID | 61728858 |
Filed Date | 2019-06-27 |
United States Patent
Application |
20190200390 |
Kind Code |
A1 |
KIM; Jongdeok ; et
al. |
June 27, 2019 |
APPARATUS AND METHOD FOR ACQUISITION OF FAST MULTI-CHANNEL DATA
BASED ON LORAWAN
Abstract
An apparatus for acquisition of fast multi-channel data based on
a long range wide area network (LoRaWAN) includes: a contention
period data processor configured to insert a flag indicating the
apparatus itself into an initial contention resolution queue (CRQ),
determine whether a flag is a flag of the apparatus, and transmit
an access request sequence (ARS) during a contention period; a
feedback period data processor configured to check whether
information taken out from a data transmission queue (DTQ) is a
flag of the apparats, check whether a contention of the apparatus
is resolved, and check whether there is a slot for which contention
is not resolved among other slots during a feedback period.
Inventors: |
KIM; Jongdeok; (Busan,
KR) ; SHIN; Jaeho; (Busan, KR) ; KIM;
Donghyun; (Busan, KR) ; HUH; Junhwan; (Busan,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Pusan National University Industry-University Cooperation
Foundation |
Busan |
|
KR |
|
|
Assignee: |
Pusan National University
Industry-University Cooperation Foundation
Busan
KR
|
Family ID: |
61728858 |
Appl. No.: |
16/208833 |
Filed: |
December 4, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 56/001 20130101;
H04W 56/005 20130101; H04W 72/0446 20130101; H04W 74/08 20130101;
H04W 74/0825 20130101; H04W 28/08 20130101; H04W 72/0453 20130101;
H04W 4/80 20180201 |
International
Class: |
H04W 74/08 20060101
H04W074/08; H04W 72/04 20060101 H04W072/04; H04W 4/80 20060101
H04W004/80; H04W 56/00 20060101 H04W056/00; H04W 28/08 20060101
H04W028/08 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 27, 2017 |
KR |
10-2017-0180673 |
Claims
1. An apparatus for acquisition of fast multi-channel data based on
a long range wide area network (LoRaWAN), the apparatus comprising:
a contention period data processor configured to insert a flag
indicating the apparatus itself into an initial contention
resolution queue (CRQ), determine whether a flag is a flag of the
apparatus, and transmit an access request sequence (ARS) during a
contention period; a feedback period data processor configured to
check whether information taken out from a data transmission queue
(DTQ) is a flag of the apparats, check whether a contention of the
apparatus is resolved, and check whether there is a slot for which
contention is not resolved among other slots during a feedback
period; and a data transmitter configured to insert the flag of the
apparatus itself into the DTQ, take out one flag from the DTQ at
each round, and transmit data when the flag is the flag of the
apparatus during a data transmission period.
2. The apparatus of claim 1, wherein the contention period data
processor comprises: a flag inserter configured to insert the flag
indicating the apparatus itself into the initial CRQ; an ARS
transmission determiner configured to determine whether to transmit
the ARS by determining whether the information taken out from the
CRQ is the flag of the apparatus itself; and an ARS transmitter
configured to select a contention slot when the information taken
out from the CRQ is the flag of the apparatus and transmit the
ARS.
3. The apparatus of claim 1, wherein the feedback period data
processor comprises: a feedback packet (FBP) receiver configured to
receive an FBP; a flag checker configured to check whether the
information taken out from the DTQ is the flag of the apparatus
itself; a contention result checker configured to check whether a
contention of the apparatus is resolved; and a slot contention
result checker configured to check whether there is a slot for
which contention is not resolved among other slots.
4. The apparatus of claim 1, wherein the ARS is transmitted when
the CRQ is empty and when content of a CRQ head allows
transmission.
5. The apparatus of claim 1, wherein channels are divided into a
control and data transmission channel consisting of a contention
slot, a feedback slot, and a data slot and a data transmission
channel consisting of only a data slot.
6. The apparatus of claim 5, wherein all terminals contend on the
same control and data transmission channel, and physical channels
specified in a LoRaWAN standard are simultaneously receivable by a
gateway.
7. The apparatus of claim 6, wherein the gateway is configured to:
sequentially allocate terminals with contention resolved to data
channels to distribute a channel traffic load; transmit a
synchronization packet (FBP) notifying time synchronization of
terminals and the number of contention slots; transmit information
on whether a collision between ARSs transmitted for contention
occurs to the terminals; and transmit information (FBP) on the data
transmission channel and a transmission time to the terminal with
contention resolved.
8. A method of acquisition of fast multi-channel data based on a
long range wide area network (LoRaWAN), the method comprising:
Inserting a flag of a terminal into an initial contention
resolution request (CRQ) during a terminal process; selecting a
contention slot and transmitting an access request sequence (ARS)
when information taken out from the CRQ is a flag of the terminal;
after receiving a contention result through a feedback packet
(FBP), inserting the flag of the terminal into a CRQ when
information taken out from the CRQ is the flag of the terminal
itself; updating a data transmission channel and a data
transmission queue (DTQ) and inserting the flag of the terminal
into the DTQ when a contention of the process is resolved; and
checking whether information taken out from the flag of the
terminal and transmitting data through a corresponding channel when
the information is the flag of the terminal.
9. The method of claim 8, wherein the selecting of the contention
slot comprises staying in standby mode for a contention period when
the information is not the flag of the terminal, and selecting the
contention slot and transmitting the ARS when the information is
the flag of the terminal.
10. The method of claim 8, wherein the inserting of the flag of the
terminal into the CRQ comprises determining whether there is a slot
for which contention is not resolved among other slots when the
received contention result is not a contention result of the
process, and increasing a size of the CRQ when there is a slot for
which contention is not resolved among other slots.
11. The method of claim 8, wherein the inserting of the flag of the
terminal into the CRQ comprises checking whether a contention of
the process is resolved when the received contention result is a
contention result of the process, determining whether there is a
slot for which contention is not resolved among other slots when
the contention of the process is not resolved, and increasing a
size of the CRQ when there is a slot for which contention is not
resolved among other slots.
12. The method of claim 8, wherein the transmitting of the ARS is
performed when the CRQ is empty and when content of a CRQ head
allows transmission.
13. The method of claim 8, wherein channels are divided into a
control and data transmission channel consisting of a contention
slot, a feedback slot, and a data slot and a data transmission
channel consisting of only a data slot.
14. The method of claim 8, wherein, while the process in the
terminal is in progress, a gateway sequentially allocates terminals
with contention resolved to data channels to distribute a channel
traffic load, and the gateway performs operations of transmitting a
synchronization packet (FBP) notifying time synchronization of
terminals and the number of contention slots, transmitting
information on whether a collision between ARSs transmitted for
contention occurs to the terminals, and transmitting information
(FBP) on the data transmission channel and a transmission time to
the terminal with contention resolved.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to and the benefit of
Korean Patent Application No. 10-2017-0180673, filed on Dec. 27,
2017, the disclosure of which is incorporated herein by reference
in its entirety.
BACKGROUND
[0002] The present invention relates to acquisition of fast
multi-channel data, and more specifically, to an apparatus and
method for acquisition of fast multi-channel data based on a long
range wide area network (LoRaWAN), which increase data acquisition
efficiency in a fast multi-channel environment, using a contention
resolution queue (CRQ) and a data transmission queue (DTQ).
[0003] As the Internet of Things (IoT) service has become popular
with the development of the Internet, a low power wide area (LPWA)
communication that supports low-power consumption design, low-cost
terminal supply, low construction cost, stable coverage,
implementation of accessing a large number of terminals, and the
like has been essentially required.
[0004] Among the currently available services, a long range wide
area network (LoRaWAN) provided by the LoRa Alliance sets up a
novel low-power Internet communication network and provides
services.
[0005] Since a bandwidth of 1 GHz or less is utilized, it is easy
to provide services in an environment in which many obstacles
exist, and a coverage is relatively wide, so that the communication
network construction cost can be reduced and the stable coverage
can be secured.
[0006] The development of LoRaWAN technology is being pursed
worldwide by mobile communication operators and major hardware and
software companies.
[0007] In data transmission based on such a LoRaWAN, resource waste
due to concentrated channel traffic occurs, thereby lowering data
acquisition efficiency in a fast multi-channel environment.
[0008] Therefore, there is a need for developing a new technology
that improves resource usage efficiency through control of all data
channels.
PRIOR ARTS
Patent Documents
[0009] Korean Patent Publication No. 10-1742997
[0010] Korean Laid-open Patent Publication No. 10-2017-0042947
[0011] Korean Laid-open Patent Publication No. 10-2012-0127725
SUMMARY
[0012] The present invention aims to solve the above-described
problems of a fast multi-channel data acquisition technology and
provide an apparatus and method for acquisition for fast
multi-channel data based on a long range wide area network
(LoRaWAN), which increase data acquisition efficiency in a fast
multi-channel data environment, using a contention resolution queue
(CRQ) and a data transmission queue (DTQ).
[0013] The present invention aims to provide an apparatus and
method for acquisition of fast multi-channel data based on a
LoRaWAN, which allow efficient use of resources in a fast
multi-channel environment, using a CRQ which determines whether to
transmit an access request sequence (ARS) at a current round and a
DTQ which determines whether to transmit data at a current
round.
[0014] The present invention aims to provide an apparatus and
method for acquisition of fast multi-channel data based on a
LoRaWAN, which maximize the resource usage with distributed channel
traffic by inserting a flag indicating an apparatus into an initial
CRQ and selecting a contention slot and transmitting an ARS when
information taken out from the CRQ is a flag of the terminal during
a contention period.
[0015] The present invention aims to provide an apparatus and
method for acquisition of fast multi-channel data based on a
LoRaWAN, which increase data acquisition efficiency in a fast
multi-channel environment by receiving a contention result through
an FBP, selecting a channel according to the contention result, and
transmitting data in a feedback period.
[0016] The present invention is not limited hereto, and other
objectives not described above will be more clearly understood from
what has been set forth hereunder.
[0017] In one general aspect, there is provided an apparatus for
acquisition of fast multi-channel data based on a LoRaWAN,
including: a contention period data processor configured to insert
a flag indicating the apparatus itself into an initial CRQ,
determine whether a flag is a flag of the apparatus, and transmit
an ARS during a contention period; a feedback period data processor
configured to check whether information taken out from a DTQ is a
flag of the apparats, check whether a contention of the apparatus
is resolved, and check whether there is a slot for which contention
is not resolved among other slots during a feedback period; and a
data transmitter configured to insert the flag of the apparatus
itself into the DTQ, take out one flag from the DTQ at each round,
and transmit data when the flag is the flag of the apparatus during
a data transmission period.
[0018] The contention period data processor may include a flag
inserter configured to insert the flag indicating the apparatus
itself into the initial CRQ, an ARS transmission determiner
configured to determine whether to transmit the ARS by determining
whether the information taken out from the CRQ is the flag of the
apparatus itself, and an ARS transmitter configured to select a
contention slot when the information taken out from the CRQ is the
flag of the apparatus and transmit the ARS.
[0019] The feedback period data processor may include a feedback
packet (FBP) receiver configured to receive an FBP, a flag checker
configured to check whether the information taken out from the DTQ
is the flag of the apparatus itself, a contention result checker
configured to check whether a contention of the apparatus is
resolved, and a slot contention result checker configured to check
whether there is a slot for which contention is not resolved among
other slots.
[0020] The ARS may be transmitted when the CRQ is empty and when
content of a CRQ head allows transmission.
[0021] Channels may be divided into a control and data transmission
channel consisting of a contention slot, a feedback slot, and a
data slot and a data transmission channel consisting of only a data
slot.
[0022] All terminals may contend on the same control and data
transmission channel and a gateway is capable of simultaneously
receiving physical channels specified in a LoRaWAN standard.
[0023] The gateway may sequentially allocate terminals with
contention resolved to data channels to distribute a channel
traffic load, transmit a synchronization packet (FBP) notifying
time synchronization of terminals and the number of contention
slots, transmit information on whether a collision between ARSs
transmitted for contention occurs to the terminals, and transmit
information (FBP) on the data transmission channel and a
transmission time to the terminal with contention resolved.
[0024] In another general aspect, there is provided a method for
acquisition of fast multi-channel data based on a LoRaWAN,
including: inserting a flag of a terminal into an initial CRQ
during a terminal process,; selecting a contention slot and
transmitting an ARS when information taken out from the CRQ is a
flag of the terminal; after receiving a contention result through a
FBP, inserting the flag of the terminal into a CRQ when information
taken out from the CRQ is the flag of the terminal; updating a data
transmission channel and a DTQ and inserting the flag of the
terminal into the DTQ when a contention of the process is resolved;
and checking whether information taken out from the flag of the
terminal and transmitting data through a corresponding channel when
the information is the flag of the terminal.
[0025] The selecting of the contention slot may include staying in
standby mode for a contention period when the information is not
the flag of the terminal, and selecting the contention slot and
transmitting the ARS when the information is the flag of the
terminal.
[0026] The inserting of the flag of the terminal into the CRQ may
include determining whether there is a slot for which contention is
not resolved among other slots when the received contention result
is not a contention result of the process, and increasing a size of
the CRQ when there is a slot for which contention is not resolved
among other slots.
[0027] The inserting of the flag of the terminal into the CRQ may
include checking whether a contention of the process is resolved
when the received contention result is a contention result of the
process, determining whether there is a slot for which contention
is not resolved among other slots when the contention of the
process is not resolved, and increasing a size of the CRQ when
there is a slot for which contention is not resolved among other
slots.
[0028] The transmitting of the ARS may be performed when the CRQ is
empty and when content of a CRQ head allows transmission.
[0029] Channels may be divided into a control and data transmission
channel consisting of a contention slot, a feedback slot, and a
data slot and a data transmission channel consisting of only a data
slot.
[0030] While the process in the terminal is in progress, a gateway
may sequentially allocate terminals with contention resolved to
data channels to distribute a channel traffic load and the gateway
may perform operations of transmitting a synchronization packet
(FBP) notifying time synchronization of terminals and the number of
contention slots, transmitting information on whether a collision
between ARSs transmitted for contention occurs to the terminals,
and transmitting information (FBP) on the data transmission channel
and a transmission time to the terminal with contention
resolved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The above and other objects, features and advantages of the
present invention will become more apparent to those of ordinary
skill in the art by describing exemplary embodiments thereof in
detail with reference to the accompanying drawings, in which:
[0032] FIG. 1 is a configuration diagram illustrating an apparatus
for acquisition of fast multi-channel data based on a long range
wide area network (LoRaWAN) according to the present invention;
[0033] FIG. 2 is a flowchart illustrating a method of acquisition
of fast multi-channel data based on a LoRaWAN according to the
present invention;
[0034] FIGS. 3A to 3D are configuration diagrams for describing a
distributed queue (DQ) structure and a DQ protocol;
[0035] FIGS. 4A to 4D are configuration diagrams for describing a
channel traffic and fast multi-channel data acquisition in a
multi-channel based LoRaWAN; and
[0036] FIGS. 5A and 5B are configuration diagrams for describing
symbol definition and performance analysis by acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention.
DETAILED DESCRIPTION
[0037] Hereinafter, exemplary embodiments of an apparatus and
method for acquisition of fast multi-channel data based on a long
range wide area network (LoRaWAN) will be described in detail.
[0038] Features and advantages of the apparatus and method for
acquisition of fast multi-channel data based on a LoRaWAN will be
apparent from detailed descriptions of each embodiment below.
[0039] FIGS. 3A to 3D are configuration diagrams for describing a
distributed queue (DQ) structure and a DQ protocol, and FIGS. 4A to
4D are configuration diagrams for describing acquisition of channel
traffic and fast multi-channel data of a multi-channel-based
LoRaWAN.
[0040] The apparatus and method for acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention enable the efficient use of resources in a fast
multi-channel environment by using a contention resolution queue
(CRQ) which determines whether to transmit an access request
sequence (ARS) at a current round and a data transmission queue
(DTQ) which determines whether to transmit data at a current
round.
[0041] To this end, the present invention may be configured to
insert a flag indicating an apparatus into an initial flag and,
when information taken out from a CRQ is the flag of the terminal,
select a contention slot and transmit an ARS during a contention
period.
[0042] The present invention may be configured to receive a
contention result through a feedback packet (FBP), select a channel
according to the contention result, and transmit data during a
feedback period.
[0043] In the following description, a "contention period" is a
period in which a terminal randomly selects a contention slot, a
"feedback period" is a period in which a contention result is
notified, and a "data period" is a period in which data
transmission is possible without collision.
[0044] The process of acquisition of fast multi-channel data based
on a LoRaWAN will be described below.
[0045] FIG. 3A is a diagram illustrating a DQ structure which shows
configurations of a centralized queue and a distributed queue.
[0046] FIG. 3B is a diagram illustrating a DQ structure, in which
the DQ has a contention period, a feedback period, and a data
period, wherein a terminal randomly selects a contention slot and
contends during the contention period, a contention result is
informed during the feedback period, and data transmission without
collision is possible during the data period.
[0047] FIG. 3C is a diagram illustrating a DQ structure in which a
control channel and a data channel are separate from each
other.
[0048] FIG. 3D is a diagram illustrating a DQ frame structure, in
which the contention period, the feedback period, and the data
period are defined as a round.
[0049] The contention period is a period for contention for
acquiring a data slot and in this period, an ARS, which serves as a
contention preamble of a terminal, is transmitted.
[0050] The feedback period is a period for transmitting a feedback
packet (FBP) containing the contention result to notify a result of
a contention among terminals.
[0051] In addition, as for roles of queues in the terminal, a CRQ
is used to determine whether to transmit an ARS at a current round
and a DTQ is used to determine whether to transmit data at a
current round.
[0052] The ARS is transmitted when a CRQ is empty and when the
content of a CQR head allows transmission.
[0053] In addition, FIGS. 4A to 4D are diagrams for describing
acquisition of channel traffic and fast multi-channel data of a
multi-channel-based LoRaWAN.
[0054] As shown in FIG. 4A, in the multi-channel-based LoRaWAN, N
terminals randomly select K channels to transmit data and generally
the number N of terminals is greater than the number K of
channels.
[0055] FIG. 4B is a diagram illustrating an ideal form in which the
resource usage is maximized by distributed channel traffic.
[0056] FIG. 4C is a diagram illustrating a case in which N
terminals concentrate on one channel, showing a waste of resource
due to concentrated channel traffic.
[0057] FIG. 4D is a diagram illustrating acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention, for which a control channel and a data channel are
separate from each other, an ARS serving as a contention preamble
of a terminal is transmitted during a contention period and an FBP
containing a contention result is transmitted in a feedback period
so that all data channels can be controlled.
[0058] In the apparatus and method for acquisition of fast
multi-channel data based on a LoRAWAN according to the present
invention, channels are divided into a control and data
transmission channel and a data transmission channel, and terminals
contend only on the control and data transmission channel.
[0059] The control and data transmission channel consists of a
contention slot, a feedback slot, and a data slot, and the data
transmission channel consists of only data slots.
[0060] In addition, a gateway must be able to simultaneously
receive physical channels specified in the LoRaWAN standard, and
all terminals contend on the same channel.
[0061] The gateway sequentially allocates terminals with contention
resolved to data channels to distribute a channel traffic load.
[0062] The gateway process proceeds as follows.
[0063] First, the gateway transmits a synchronization packet (FBP)
notifying time synchronization of terminals and the number of
contention slots.
[0064] Then, information on whether a collision between ARSs
transmitted for contention occurs is transmitted to the
terminals.
[0065] Information (FBP) on the data transmission channel and a
transmission time is transmitted to the terminal with contention
resolved.
[0066] FIG. 1 is a configuration diagram illustrating an apparatus
for acquisition of fast multi-channel data based on a LoRaWAN
according to the present invention.
[0067] As shown in FIG. 1, the apparatus for acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention includes a contention period data processor configured to
perform a data acquisition process in a contention period, wherein
the contention period data processor includes a flag inserter 10
configured to insert a flag indicating the apparatus itself into an
initial CRQ, an ARS transmission determiner 11 configured to
determine whether to transmit an ARS by determining whether
information taken out from the CRQ is a flag of the apparatus
itself, and an ARS transmitter 12 configured to select a contention
slot and transmit an ARS when the information taken out from the
CRQ is the flag of the apparatus.
[0068] In addition, a feedback period data processor configured to
perform a data acquisition process in a feedback period includes an
FBP receiver 21 configured to receive an FBP, a flag checker 23
configured to check whether information taken out from a DTQ is the
flag of the apparatus, a contention result checker 22 configured to
check whether contention of the apparatus is resolved, and a
slot-contention result checker 20 configured to check whether there
is a slot for which contention is not resolved among other
slots.
[0069] Further, a data transmitter 30 is configured to insert the
flag of the apparatus into the DTQ, take out one flag from the DTQ
at each round, and transmit data when the flag is the flag of the
apparatus.
[0070] A method of acquisition of fast multi-channel data based on
a LoRaWAN according to the present invention will be described
below.
[0071] FIG. 2 is a flowchart illustrating a method of acquisition
of fast multi-channel data based on a LoRaWAN according to the
present invention.
[0072] The method of acquisition of fast multi-channel data based
on a LoRaWAN according to the present invention includes: inserting
a flag of a terminal into an initial CRQ during a terminal process;
selecting a contention slot and transmitting an ARS when
information taken out from the CRQ is the flag of the terminal;
after receiving a contention result through an FBP, inserting the
flag of the terminal into the CRQ when a contention of the terminal
is not resolved; updating a data transmission channel and a DTQ and
inserting the flag of the terminal into the DTQ when a contention
of the terminal is resolved; and checking whether information taken
out from the DTQ is the flag of the terminal for a round and
transmitting data through a corresponding channel when the
information is the flag of the terminal.
[0073] Specifically, as shown in FIG. 2, a flag indicating the
terminal itself is inserted into an initial CRQ (S201).
[0074] Information is taken out from the CRQ (S202) and whether the
information taken out from the CRQ is the flag of the terminal is
determined (S203).
[0075] When the information is not its own flag, the terminal stays
in standby mode for a contention period (S204), and when the
information is its own flag, a contention slot is selected and an
ARS is transmitted (S205).
[0076] In addition, a contention result is received through an FBP
in a feedback period (S206), whether the received contention result
is a contention result of the terminal is checked (S207), and when
the contention result is not a contention result of the terminal,
whether there is a slot for which contention is not resolved among
other slots is determined (S208).
[0077] When there is a slot for which contention is not resolved
among other slots, a size of the CRQ is increased (S209).
[0078] In addition, when the received contention result is the
contention result of the terminal, it is checked whether contention
of the terminal is resolved (S210), and when the contention of the
terminal is not resolved, whether there is a slot for which
contention is not resolved among other slots is checked (S211).
[0079] When there is a slot for which contention is not resolved
among other slots, a size of the CRQ is increased (S212).
[0080] When the contention of the terminal is resolved, a flag of
the terminal is inserted into a DTQ in a data transmission period,
one DTQ is taken out at each round, and data is transmitted when
the taken DTQ is the flag of the terminal (S213).
[0081] FIGS. 5A and 5B are configuration diagrams for describing
symbol definition and performance analysis by acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention.
[0082] In the present invention, the number of contention slots (W)
may be set by Equation 1 below.
R N = 1 + K = 2 N - 1 ( N K ) ( W - 1 ) N - K R K W N - 1 1 - 1 W N
- 1 [ Equation 1 ] ##EQU00001##
[0083] Here, R.sub.N denotes the average number of rounds necessary
for resolving N contentions.
[0084] The performance of fast multi-channel data acquisition in
accordance with the present invention may be defined as Equation
2.
Throughput = lim N .fwdarw. .infin. N T d ( T c joint + N K - 1 T d
) K .apprxeq. K - 1 K [ Equation 2 ] ##EQU00002##
[0085] In FIG. 5A, N denotes the number of terminals, K denotes the
number of channels, W denotes the number of contention slots,
T.omega. denotes ARS transmission time, Tf and Tf.sub.joint denote
FBP transmission times, Td denotes data transmission time, Tc and
Tc.sub.joint denote control period times, and T.sub.R denotes time
of one round.
[0086] The apparatus and method for acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention allow the efficient use of resources in a fast
multi-channel environment by using a CRQ which determines whether
to transmit an ARS and a DTQ which determines whether to transmit
data at a current round.
[0087] As set forth above, according to exemplary embodiments of
the invention, the apparatus and method for acquisition of fast
multi-channel data based on a LoRaWAN according to the present
invention has the following effects.
[0088] First, it is possible to improve data acquisition efficiency
in a fast multi-channel environment, using a CRQ and a DTQ.
[0089] Second, it is possible to efficiently use resources in a
fast multi-channel environment, using a CRQ which determines
whether to transmit an ARS at a current round and a DTQ which
determines whether to transmit data at a current round.
[0090] Third, it is possible to maximize the resource usage with
distributed channel traffic by inserting a flag indicating a
terminal itself into an initial CRQ and selecting a contention slot
and transmitting an ARS when information taken out from the CRQ is
a flag of the terminal itself during a contention period.
[0091] Fourth, it is possible to increase data acquisition
efficiency in a fast multi-channel environment by receiving a
contention result through an FBP, selecting a channel according to
the contention result, and transmitting data in a feedback
period.
[0092] As described above, it should be understood by those skilled
in the art that various modifications and changes can be made
without departing from substantial features of the invention.
[0093] Therefore, the disclosed embodiments should be considered in
the aspect of illustration rather than restriction. It should be
understood that the scope of the invention appears in claims rather
than in the foregoing specification, and equivalents of the claims
are included in the invention.
* * * * *