CN107155209A - Asymmetric LoRa communication systems and its control method - Google Patents
Asymmetric LoRa communication systems and its control method Download PDFInfo
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- CN107155209A CN107155209A CN201710603971.9A CN201710603971A CN107155209A CN 107155209 A CN107155209 A CN 107155209A CN 201710603971 A CN201710603971 A CN 201710603971A CN 107155209 A CN107155209 A CN 107155209A
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- host node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1438—Negotiation of transmission parameters prior to communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Abstract
A kind of asymmetric LoRa communication systems and its control method provided in an embodiment of the present invention, are related to field of wireless transmission, and the system includes host node and from node.The host node includes active crystal oscillator and power amplifier.The active crystal oscillator and the power amplifier are coupled with the host node respectively, and the host node sets up wireless communication connection with described from node；The power amplifier, the transmission power for improving the host node；The active crystal oscillator, the clock stability for increasing the host node improves the receiving sensitivity of the host node.For traditional LoRa communication systems, the system can improve communication distance.
Description
Technical field
The present invention relates to field of wireless transmission, in particular to a kind of asymmetric LoRa communication systems and its controlling party
Method.
Background technology
LoRa is a kind of overlength distance wireless transmission scheme based on spread spectrum proposed by Semtech companies of the U.S.,
Compared with other wireless communication technologys, it can significantly improve network efficiency, eliminate interference, copy in the table collection of water power hot air heating four, intelligence
Low-power consumption, the telecommunication fields such as energy managing system of car parking, industrial remote data acquisition are widely used.
With the development of science and technology, the wireless communication distance of traditional LoRa communication systems starts bottleneck occur, it is impossible to meet
In practical application.Therefore, the communication distance for improving LoRa communication systems is significant for LoRa communication systems.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of asymmetric LoRa communication systems and its controlling party
For method, with traditional LoRa communication systems, communication distance is improved.
In a first aspect, the embodiments of the invention provide a kind of asymmetric LoRa communication systems, including host node and from section
Point, the host node includes active crystal oscillator and power amplifier.The active crystal oscillator and the power amplifier respectively with
The host node coupling, the host node sets up wireless communication connection with described from node；The power amplifier, for improving
The transmission power of the host node；The active crystal oscillator, the clock stability for increasing the host node improves the main section
The receiving sensitivity of point.
In preferred embodiments of the present invention, the host node and/or described uplink communication mould is pre-saved out of node
Formula and DOWN communication mode, every kind of communication pattern correspond to different spreading factor and bandwidth, the host node respectively
And/or it is described from node detect the system be in different communication patterns when, based on corresponding with the communication pattern
Spreading factor, bandwidth and transmission power work.
In preferred embodiments of the present invention, the spreading factor corresponding to the uplink communication pattern be more than it is described under
Spreading factor corresponding to row communication pattern, the bandwidth corresponding to the uplink communication pattern is less than the DOWN communication mode institute
Corresponding bandwidth, the transmission power corresponding to the uplink communication pattern is less than the transmitting work(corresponding to the DOWN communication mode
Rate.
In preferred embodiments of the present invention, the active crystal oscillator is TCXO temperature-compensating crystal oscillators.
In preferred embodiments of the present invention, the quantity from node to be multiple, it is each it is described from node respectively with institute
State host node and set up wireless communication connection.
Second aspect, the embodiment of the present invention provides a kind of communication means of asymmetric LoRa communication systems, and methods described should
With asymmetric LoRa communication system communications, the system includes host node and from node, and the host node includes active crystal oscillator
And power amplifier；The active crystal oscillator and the power amplifier are coupled with the host node respectively, the host node
From node wireless communication connection is set up with described, the host node and/or described uplink communication pattern is pre-saved out of node
And DOWN communication mode, every kind of communication pattern corresponds to different spreading factors, bandwidth and transmission power respectively；It is described
Method includes：When the host node is communicated to connect with described set up from node；If in DOWN communication mode, the power amplification
Device improves the transmission power of the host node, the asymmetric LoRa communication systems work in low spreading factors, big bandwidth and
High emission power；If in uplink communication pattern, the active crystal oscillator increases the clock stability of the host node, described non-right
LoRa communication systems are claimed to work in high spreading factor, small bandwidth and low transmitting power.
The beneficial effect of the embodiment of the present invention is：The embodiments of the invention provide a kind of asymmetric LoRa communication systems and its
Control method, the system includes host node and from node, and the host node includes active crystal oscillator and power amplifier.This is
System improves the transmission power of the host node by the power amplifier, by the active crystal oscillator, increases the master
The clock stability of node, improves the receiving sensitivity of the host node.Because host node typically uses mains-supplied, to power consumption
It is insensitive, it therefore, it can improve the transmission power of host node by power amplifier so that can more be connect from node at a distance
The radiofrequency signal of host node transmitting is received, to increase link budget, meanwhile, host node uses active crystal oscillator, can obtain higher
Receiving sensitivity so that host node can receive more at a distance from node launch weak radio-frequency signal, improve communication
Distance.
Other features and advantages of the present invention will be illustrated in subsequent specification, also, partly be become from specification
It is clear that or being understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by being write
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be attached to what is used required in embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is a kind of structured flowchart for asymmetric LoRa communication systems that first embodiment of the invention is provided.
Fig. 2 is the operating diagram for another asymmetric LoRa communication systems that first embodiment of the invention is provided；
Fig. 3 is a kind of structured flowchart for asymmetric LoRa communication systems that second embodiment of the invention is provided；
Fig. 4 is a kind of flow chart of the control method for asymmetric LoRa communication systems that third embodiment of the invention is provided.
Icon：The asymmetric LoRa communication systems of 100-；110- host nodes；120- is from node；The active crystal oscillators of 130-；
140- power amplifiers.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.The present invention implementation being generally described and illustrated herein in the accompanying drawings
The component of example can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, or should
Orientation or position relationship that invention product is usually put when using, are for only for ease of the description present invention and simplify description, without
It is that instruction or the signified device of hint or element must have specific orientation, with specific azimuth configuration and operation, therefore not
It is understood that as limitation of the present invention.In addition, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that referring to
Show or imply relative importance.
In addition, the term such as term " level ", " vertical ", " pendency " is not offered as requiring part abswolute level or pendency, and
It is to be slightly tilted.As " level " only refers to that its direction, with respect to more level for " vertical ", is not the expression structure
Must be fully horizontal, but can be slightly tilted.
In the description of the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or one
Connect body；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirect by intermediary
It is connected, can is the connection of two element internals.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
First embodiment
Fig. 1 is refer to, the present embodiment provides a kind of asymmetric LoRa communication systems 100, the asymmetric LoRa communication systems
System 100 includes host node 110 and from node 120, and the host node 110 includes active crystal oscillator 130 and power amplifier
140。
The active crystal oscillator 130 and the power amplifier 140 are coupled with the host node 110 respectively.The main section
Point 110 between node 120 can set up wireless communication connection with described.
Wherein, the host node 110 and it is described between node 120 can based on linear frequency modulation spread spectrum modulation technique set up
Communication connection so that host node 110 and from the communication between node 120 both maintained FSK (frequency shift keying) modulation identical it is low
Power consumption characteristics, significantly increase communication distance again, while improve network efficiency and eliminate interference, i.e., different frequency expansion sequences
Terminal even if using identical frequency simultaneously send will not also interfere.
The host node 110 and the communication between node 120 are mainly (i.e. non-to award in global free frequency range operation
Weigh frequency range), including 433,868,915MHz etc..
In general, host node 110 can use mains-supplied, it is powered from node 120 using battery.
The active crystal oscillator 130 is coupled with the host node 110.When the active crystal oscillator 130 and the coupling of host node 110
After conjunction, the clock stability of the host node 110 can be improved.Because the clock stability of host node is higher, signal bandwidth is got over
Small so that receiving sensitivity is higher, therefore, when the coupling active crystal oscillator 130 on the host node 110, and the host node is made
For data receiver receive from node send data when, the receiving sensitivity of the host node 110 can be improved, so as to improve
The host node 110 and the communication distance between node 120.
Further, the active crystal oscillator 130 can be TCXO temperature-compensating crystal oscillators.It is described active in the present embodiment
Crystal oscillator 130 can select 0.05ppm high-precision 32MHZ temperature-compensatings crystal oscillator.
Certainly, ordinary passive crystal oscillator can also be coupled from node 120, for example with the common crystals that precision is 10ppm.
The power amplifier 140, can improve the transmission power of host node 110 so that the emission maximum of host node 110
Power can reach 30dBm.Wherein, the model of the power amplifier 140 can be BLT53A etc..
When the host node 110 with described from when being communicated between node 120, the LoRa communication systems 100 can be with
Including uplink communication pattern and DOWN communication mode.When LoRa communication systems 100 are in DOWN communication mode, the main section
Point 110 is in emission state, described to be in reception state from node 120；When LoRa communication systems 100 are in uplink communication pattern
When, the host node 110 is in reception state, described to be in emission state from node 120.
When the asymmetric LoRa communication systems 100 are in DOWN communication mode, because host node 110 typically uses city
Electricity power supply, it is insensitive to power consumption, it therefore, it can improve the transmission power of host node 110 by power amplifier 140 so that more
The radiofrequency signal of the transmitting of host node 110 can be received from node 120 at a distance, to increase link budget.Although from node
120 use common crystals, sacrifice receiving sensitivity, but the receiving sensitivity sacrificed can by host node 110 compared with
Highland transmission power is compensated, and then extends host node 110 and from the communication distance between node 120.
When the asymmetric LoRa communication systems 100 are in uplink communication pattern, host node 110 uses active crystal oscillator
130, host node 110 obtains higher receiving sensitivity so that host node 110 can be received more at a distance from node 120
The weak radio-frequency signal of transmitting, although the more passive crystal oscillator of the power consumption of temperature-compensating crystal oscillator is much larger, host node 110 is generally adopted
It is insensitive to power consumption with mains-supplied, extend host node 110 and from the communication distance between node 120.
Traditional LoRa systems are when being communicated, and its up communication pattern and DOWN communication mode are all based on identical
Spreading factor, bandwidth and transmission power are communicated.But in practical situations both, LoRa systems are in different communication patterns
When, host node 110 and be also different from requirement of the node 120 to power consumption, spreading factor, bandwidth and transmission power three are controllable
Be adjusted to the increase system transmission range, reduction system power dissipation of parameter provide possibility.
As a kind of embodiment, uplink communication pattern and downlink communication can be pre-saved in the host node 110
Pattern, every kind of communication pattern corresponds to different spreading factor and signal bandwidth, such as uplink communication pattern correspondence respectively
Up spreading factor, upward signal bandwidth and uplink signal transmission power, it is the descending spreading factor of DOWN communication mode correspondence, descending
Signal bandwidth and downstream signal transmission power.When the asymmetric LoRa communication systems 100 are in uplink communication pattern, principal and subordinate
Communicated between node using up spreading factor, upward signal bandwidth and uplink transmission power, as the asymmetric LoRa
When communication system 100 is in DOWN communication mode, using descending spreading factor, downstream signal bandwidth and descending between main and subordinate node
Transmission power is communicated.
It is of course also possible to pre-save uplink communication pattern and DOWN communication mode out of node 120 described；May be used also
The host node 110 and to preserve uplink communication pattern and DOWN communication mode out of node 120.
It is more than the DOWN communication mode it is possible to further set the spreading factor corresponding to uplink communication pattern
Corresponding spreading factor, for example, be set as 12 by up spreading factor SF, descending spreading factor be set as into 9.Wherein, spread
The factor is bigger, and the anti-multipath jamming performance of signal is better, and the receiving sensitivity of recipient is also higher, and transmission range is more remote；Also
Upward signal bandwidth can be set less than downstream signal bandwidth, for example, upward signal bandwidth BW is set as 62.5KHz, will be descending
Signal bandwidth BW is set as 500KHz；Uplink signal transmission power is less than the transmission power of downstream signal, such as by upward signal
Transmission power be set to 20dBm, the transmission power of downstream signal is set to 30dBm.
Refer to Fig. 2, the host node 110 and/or it is described pre-saved out of node 120 uplink communication pattern and
After DOWN communication mode, when the asymmetric LoRa communication systems 100 are communicated, if in DOWN communication mode, main section
Point 110 and from node 120 work in relatively low spreading factor (such as 9), larger signal bandwidth (such as 500KHz) and
Larger transmission power (such as 30dBm).It can be seen from CAD monitors time formula (2SF+32)/BW, now from node 120
CAD monitoring durations are shorter.For the CAD that periodicity is performed, the shorter CAD monitoring times, greatly reduce from node
120 power consumption, is extended from the battery of node 120.It is unwise to power consumption again because host node 110 uses mains-supplied
Sense, improves its transmission power to increase link budget, and then extend communication distance.
If in uplink communication pattern, receiving-transmitting sides work in higher spreading factor (such as 12), less signal
Bandwidth (such as 62.5KHz) and less transmission power (such as 20dBm).For asymmetric LoRa communication systems 100, compared with
High spreading factor and less signal bandwidth, which can obtain higher receiving sensitivity, less transmission power, can reduce it
Launch power consumption, along with host node 110 uses TCXO temperature-compensating crystal oscillators, improve its receiving sensitivity, effectively increase
Link budget is added, the communication distance between main and subordinate node is extended on the premise of not increasing from the power consumption of node 120.
When main and subordinate node is without communication, host node 110 can be constantly in reception state, although power consumption is larger, but
Be host node 110 by mains-supplied, it is insensitive to power consumption；It is in from node 120 and intercepts state, i.e., periodically checks host node
Whether 110 sending signal, such as check 1ms within every 4 seconds (the 1ms times are determined by the spreading factor SF and bandwidth BW of host node).
Although the bigger BW of SF are smaller can transmit it is farther, it is longer from the detection time needed for node 120, it is meant that from node
120 power consumptions are larger, so using the larger less SF of BW when host node 110 is sent here, so from during the detection of node 120
Between can be with shorter, more power saving, the range loss thus brought is compensated by the big transmission power of host node 110.
A kind of operation principle of asymmetric LoRa communication systems 100 provided in an embodiment of the present invention is：The system includes master
Node 110, from node 120, active crystal oscillator 130 and power amplifier 140.The system is carried by the power amplifier 140
The high transmission power of the host node 110, by the active crystal oscillator 130, increases the clock stable of the host node 110
Property, improve the receiving sensitivity of the host node 110.It is insensitive to power consumption because host node 110 typically uses mains-supplied,
It therefore, it can improve the transmission power of host node 110 by power amplifier 140 so that more at a distance can be with from node 120
The radiofrequency signal of the transmitting of host node 110 is received, to increase link budget, meanwhile, host node 110 uses active crystal oscillator 130, can
To obtain higher receiving sensitivity so that host node 110 can receive the radio frequency letter more launched at a distance from node 120
Number, improve communication distance.
Second embodiment
Fig. 3 is refer to, the present embodiment provides a kind of asymmetric LoRa communication systems 100, the asymmetric LoRa communication systems
System 100 includes host node 110 and from node 120, and the host node 110 includes active crystal oscillator 130 and power amplifier
140。
Wherein, the present embodiment is with the topmost distinguishing feature of first embodiment, the quantity from node 120
Can to be multiple, it is each it is described wireless communication connection is set up with the host node 110 respectively from node 120, constitute Star Network.
3rd embodiment
Fig. 4 is refer to, the present embodiment provides a kind of communication means of asymmetric LoRa communication systems, and methods described is applied to
Asymmetric LoRa communication system communications, the system includes host node and from node, the host node include active crystal oscillator with
And power amplifier；The active crystal oscillator and the power amplifier are coupled with the host node respectively, the host node with
It is described to set up wireless communication connection from node, the host node and/or it is described pre-saved out of node uplink communication pattern with
And DOWN communication mode, every kind of communication pattern corresponds to different spreading factors, bandwidth and transmission power respectively；The side
Method includes：
Step S110：The host node is communicated to connect with described set up from node；
Step S120：If in DOWN communication mode, the power amplifier improves the transmission power of the host node, institute
State asymmetric LoRa communication systems and work in low spreading factors, big bandwidth and high emission power；
Step S130：If in uplink communication pattern, the active crystal oscillator increases the clock stability of the host node, institute
State asymmetric LoRa communication systems and work in high spreading factor, small bandwidth and low transmitting power.
In addition, the quantity from node is multiple, it is each described to set up channel radio with the host node respectively from node
Letter connection, constitutes Star Network.
In summary, a kind of asymmetric LoRa communication systems and its control method provided in an embodiment of the present invention, the system
Including host node and from node, the host node includes active crystal oscillator and power amplifier.The system passes through the power
Amplifier improves the transmission power of the host node, by the active crystal oscillator, increases the clock stable of the host node
Property, improve the receiving sensitivity of the host node.It is insensitive to power consumption because host node typically uses mains-supplied, therefore, can
To improve the transmission power of host node by power amplifier so that more can receive host node transmitting from node at a distance
Radiofrequency signal, to increase link budget, meanwhile, host node use active crystal oscillator, higher receiving sensitivity can be obtained, made
The weak radio-frequency signal more launched at a distance from node can be received by obtaining host node, improve communication distance.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of asymmetric LoRa communication systems, it is characterised in that including host node and from node, the host node includes
Source crystal oscillator and power amplifier；The active crystal oscillator and the power amplifier are coupled with the host node respectively, described
Host node sets up wireless communication connection with described from node；
The power amplifier, the transmission power for improving the host node；
The active crystal oscillator, the clock stability for increasing the host node improves the receiving sensitivity of the host node.
2. system according to claim 1, it is characterised in that the host node and/or described pre-saved out of node
Uplink communication pattern and DOWN communication mode, every kind of communication pattern correspond to different spreading factors, bandwidth and hair respectively
Penetrate power, the host node and/or it is described from node when detecting the system and being in different communication patterns, based on institute
State the corresponding spreading factor of communication pattern, bandwidth operation and transmission power.
3. system according to claim 2, it is characterised in that the spreading factor corresponding to the uplink communication pattern
More than the spreading factor corresponding to the DOWN communication mode, the bandwidth corresponding to the uplink communication pattern is less than described descending
Bandwidth corresponding to communication pattern, it is right that the transmission power corresponding to the uplink communication pattern is less than DOWN communication mode institute
The transmission power answered.
4. system according to claim 1, it is characterised in that the quantity from node be it is multiple, it is each described from section
Point sets up wireless communication connection with the host node respectively, constitutes Star Network.
5. system according to claim 1, it is characterised in that the active crystal oscillator is TCXO temperature-compensating crystal oscillators.
6. system according to claim 5, it is characterised in that the TCXO temperature-compensatings crystal oscillator is that precision is 0.05ppm
32MHZ temperature-compensating crystal oscillators.
7. system according to claim 1, it is characterised in that the host node and the communications band between node
For unauthorized frequency range.
8. system according to claim 7, it is characterised in that band a width of 433MHz or 868MHz of the unauthorized frequency range
Or 915MHz.
9. system according to claim 1, it is characterised in that the model BLT53A of the power amplifier.
10. a kind of control method of asymmetric LoRa communication systems, it is characterised in that methods described is logical applied to asymmetric LoRa
Letter system communicates, and the system includes host node and from node, and the host node includes active crystal oscillator and power amplifier；
The active crystal oscillator and the power amplifier are coupled with the host node respectively, and the host node is set up with described from node
Wireless communication connection, the host node and/or it is described uplink communication pattern and DOWN communication mode are pre-saved out of node,
Every kind of communication pattern corresponds to different spreading factors, bandwidth and transmission power respectively；Methods described includes：
The host node is communicated to connect with described set up from node；
If in DOWN communication mode, the power amplifier improves the transmission power of the host node, the asymmetric LoRa
Communication system works in low spreading factors, big bandwidth and high emission power；
If in uplink communication pattern, the active crystal oscillator increases the clock stability of the host node, the asymmetric LoRa
Communication system works in high spreading factor, small bandwidth and low transmitting power.
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| CN110995512A (en) * | 2019-12-27 | 2020-04-10 | 上海后米物联网技术有限公司 | Industrial internet lora communication and control method |
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Application publication date: 20170912 Assignee: Henan Zhuozheng Wisdom IoT Technology Co.,Ltd. Assignor: HENAN ZHUOZHENG ELECTRONIC TECHNOLOGY Co.,Ltd. Contract record no.: X2023980039156 Denomination of invention: Asymmetric LoRa Communication System and Its Control Method Granted publication date: 20190621 License type: Common License Record date: 20230808 |