CN108617005A - A kind of remote network-building method of low-power consumption - Google Patents
A kind of remote network-building method of low-power consumption Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of remote network-building methods of low-power consumption, are based on CSMA/CA Channel Access Mechanisms, it is whether occupied that network node intercepts present channel；If present channel is busy, by random algorithm computation delay back off time one, after waiting delay back off time one, present channel is intercepted again, if present channel is busy, repeatedly abovementioned steps, until network node intercepts the present channel free time；Then by random algorithm computation delay back off time two, present channel is intercepted again after waiting delay back off time two；It is busy that network node intercepts present channel, then repeatedly abovementioned steps；If it is idle to intercept present channel twice, present node data are sent to host by present channel immediately.Technical solution provided by the invention reduces node communication delay, ensure that communication success rate and reliability, reduces integral node average power consumption, improve system rejection to disturbance ability and communication distance.
Description
Technical field
The invention belongs to wireless communication technique fields, and in particular to a kind of remote network-building method of low-power consumption.
Background technology
Wireless communication technique is developed rapidly in recent years, when traditional point-to- point communication cannot be satisfied Internet of Things instantly
The network application of generation complexity, but networking modules most of on the market are all based on ISM band at present, the band channels occupancy
Greatly so that with frequency poor anti jamming capability, meanwhile, there is following drawback in practical applications in this series module：
1, node communication delay is big；
2, node communication distance is close；
3, node power consumption is high.
Instantly networking technology mostly uses slave timesharing or host computer polls two ways realizes multiple node concurrent datas.
Slave time-sharing format require in network each node must time synchronization, and the process of data communication of each node must be
It is completed in respective timeslice.The nodes data transmission time is unpredictable, and corresponding time leaf length is therewith not yet
Together, common solution is to be allocated as with the maximum time piece being likely to occur in network to do the big time, is all saved in net in this way
Point can have enough communication times, but due to the data transmission procedure of node be it is random, in most of node time pieces simultaneously
The data for not really needing communication cause the node time piece to be wasted, and whole network communication efficiency and real-time obtain
Less than guarantee.
Host computer polls mode is required to each node serial number in network, and host ceaselessly removes each of inquiry network successively
Whether node has data transmission, this mode that node is required ceaselessly to reply host inquiry no data are sent, and
The worst situation is that host had just inquired certain node, it must wait until that the next polling cycle of host could send out data, this
Mode slave power consumption is higher and communication efficiency cannot still improve.
Invention content
The purpose of the present invention is to provide a kind of remote network-building methods of low-power consumption, reduce node communication delay, ensure logical
Success rate and reliability are interrogated, integral node average power consumption is reduced, improves system rejection to disturbance ability and communication distance.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of remote network-building method of low-power consumption is based on CSMA/CA Channel Access Mechanisms, it is characterised in that including following step
Suddenly：
Step 1：Whether network node intercepts present channel occupied；If present channel is busy, calculated by random algorithm
Be delayed back off time one, after waiting delay back off time one, intercepts present channel again, if present channel is busy, repeats
Step 1, until network node intercepts the present channel free time；
Step 2：By random algorithm computation delay back off time two, intercepted again after waiting delay back off time two
Present channel；
Step 3：If it is busy to intercept present channel for network node in step 2, step 1 is returned to；If in step 1 and step 2
It is idle to intercept present channel, present node data are sent to host by present channel immediately.
Preferably, random algorithm is binary system index type back off algorithm, is included the following steps：
Step 101：The time that basic back off time 2t is present node data round trip between slave and host is defined,
Define collisions parameter k=Min [conflict number, 10], wherein conflict number is to listen to the busy number of present channel；
Step 102：Computation delay back off time T, calculation formula are：T=r*2t；
Wherein, random back index r is one taken out at random from discrete integer set [0,1,2 ... ..., 2^k-1]
A number.
Preferably, when conflict number is 16 times, random back index r takes 1023*2t.
Preferably, after conflict number is more than 16 times, network node abandons present node data.
Preferably, ranging from (0~52377.6) microsecond of delay back off time T.
Preferably, network node uses hopping, the hopping to include the following steps when networking：：
Step 201：Network is added in the request of terminal node common channel；
Step 202：Gateway device distributes present node working channel sequence according to the MAC Address of present node；
Step 203：Present node inquires neighbors working channel sequence in terminal node common channel, if neighbors works
Channel is identical as present node working channel sequence, and present node re-request gateway device distributes channel sequence, gateway device
According to the MAC Address of present node a pseudo-random channels sequence is distributed for it.
Preferably, gateway device informs the next common signal channel of present node while distributing channel for present node
Residence time and dwell period, and the next dwell period interval of oneself is updated in each dwell period；Present node exists
When the channel transmission data of oneself, the residence time and dwell period informed according to gateway device connect to terminal node common channel
Receive the inquiry message of gateway device synchronizing information and other nodes for asking to network.
Preferably, the modulation system of network-building method is GFSK Gaussian Frequency Shift Keying (GFSK)+Direct Sequence Spread Spectrum (DSSS),
The equipment for sending and receiving data uses hardware Forward Error Correction algorithm (FEC).
Preferably, in delay back off time one and delay back off time two, equipment receiver and outside are set present node
It is standby to be in closed state.
Preferably, before network node sends present node data to host in step 3, first request transmission report is sent to host
Literary (RTS) waits for host response to allow to start to send present node data again after sending message (CTS).
The beneficial effects of the invention are as follows：
The present invention intercepts current channel condition immediately, optimizes traditional approach and waits for host query time, reduces node
Communication delay.
Using hopping, avoids different nodes from being operated in different channels and generate conflict.
ACK mechanism, two inter-node communication complete response mechanism is added, sending node does not receive receiving node response message
It is retransmitted starting, ensure that the success rate and reliability of communication.
Node closes all peripheral hardwares and radio frequency system during intercepting channel busy and actively keeping out of the way, and drops to the greatest extent
Low node ensemble average power consumption.
Using Direct Sequence Spread Spectrum (DSSS) so that system rejection to disturbance ability greatly promotes.
Wireless signal uses hardware forward error correction algorithm (FEC), further enhances operation link and improves system and connects
Receive sensitivity so that module under conditions of same transmission power and aerial rate, communication distance lead and bounds ahead of now at present its
His networking module.
Description of the drawings
Fig. 1 is the node communication flow chart of the present invention.
Fig. 2 is that the node of the present invention keeps out of the way flow diagram.
Fig. 3 is the node frequency hopping channel schematic diagram of the present invention.
Fig. 4 is the coordinator broadcast channel figure of the present invention.
Specific implementation mode
With reference to attached drawing 1-4, specific description is done to embodiments of the present invention.
Embodiment 1：This programme hardware master chip is the micro-control unit (MCU) of a integrated Cortex-M3 kernels, simultaneously
System on chip (SOC) scheme that radio frequency (RF) system of integrated Cortex-M0 cores is integrated, the i.e. integrated chip RF with
MCU hardware circuits, so, the program eliminates the hardware design between RF and MCU, improves the steady of system to a certain extent
Qualitative and reliability.
A kind of remote network-building method of low-power consumption is based on CSMA/CA Channel Access Mechanisms, it is characterised in that including following step
Suddenly：
Step 1：Whether network node intercepts present channel occupied；If present channel is busy, calculated by random algorithm
Be delayed back off time one, after waiting delay back off time one, intercepts present channel again, if present channel is busy, repeats
Step 1, until network node intercepts the present channel free time；
Step 2：By random algorithm computation delay back off time two, intercepted again after waiting delay back off time two
Present channel；
Step 3：If it is busy to intercept present channel for network node in step 2, step 1 is returned to；If in step 1 and step 2
It is idle to intercept present channel, present node data are sent to host by present channel immediately.
Wherein, the purpose intercepted twice is：
1, it prevents other node datas to be just sent and waits for host response message (ACK), this node sends number during this
Fail according to other nodes ACK and the effective data communication of oneself will be made.
2, two node synchronization transmission datas are prevented, while the startup transmission of sensing channel free time leads to Communications failure.
Preferably, random algorithm is binary system index type back off algorithm, is included the following steps：
Step 101：The time that basic back off time 2t is present node data round trip between slave and host is defined,
Define collisions parameter k=Min [conflict number, 10], wherein conflict number is to listen to the busy number of present channel；
Step 102：Computation delay back off time T, calculation formula are：T=r*2t；
Wherein, random back index r is one taken out at random from discrete integer set [0,1,2 ... ..., 2^k-1]
A number.
Preferably, when conflict number is 16 times, random back index r takes 1023*2t.
Preferably, after conflict number is more than 16 times, network node abandons present node data, at this time will not be to host report
It accuses, the data that the last time sends will be dropped, and module indicates application layer by pin level, this transmission failure.
Preferably, ranging from (0~52377.6) microsecond of delay back off time T.
Preferably, network node uses hopping, the hopping to include the following steps when networking：：
Step 201：Network is added in the request of terminal node common channel；
Step 202：Gateway device distributes present node working channel sequence according to the MAC Address of present node；
Step 203：Present node inquires neighbors working channel sequence in terminal node common channel, if neighbors works
Channel is identical as present node working channel sequence, and present node re-request gateway device distributes channel sequence, gateway device
According to the MAC Address of present node a pseudo-random channels sequence is distributed for it.
Preferably, gateway device informs the next common signal channel of present node while distributing channel for present node
Residence time and dwell period, and the next dwell period interval of oneself is updated in each dwell period；Present node exists
When the channel transmission data of oneself, the residence time and dwell period informed according to gateway device connect to terminal node common channel
Receive the inquiry message of gateway device synchronizing information and other nodes for asking to network.
Preferably, the modulation system of network-building method is GFSK Gaussian Frequency Shift Keying (GFSK)+Direct Sequence Spread Spectrum (DSSS),
The equipment for sending and receiving data uses hardware Forward Error Correction algorithm (FEC).
Preferably, in delay back off time one and delay back off time two, equipment receiver and outside are set present node
It is standby to be in closed state.
Preferably, before network node sends present node data to host in step 3, first request transmission report is sent to host
Literary (RTS) waits for host response to allow to start to send present node data again after sending message (CTS).Due to RTS-CTS packages
All very littles, so the invalid expense of transmission is negligible.
Embodiment 2：This programme hardware master chip is the micro-control unit (MCU) of a integrated Cortex-M3 kernels, simultaneously
System on chip (SOC) scheme that radio frequency (RF) system of integrated Cortex-M0 cores is integrated, the i.e. integrated chip RF with
MCU hardware circuits, so, the program eliminates the hardware design between RF and MCU, improves the steady of system to a certain extent
Qualitative and reliability.
A kind of remote network-building method of low-power consumption is based on CSMA/CA Channel Access Mechanisms, it is characterised in that including following step
Suddenly：
Step 1：Whether network node intercepts present channel occupied；If present channel is busy, calculated by random algorithm
Be delayed back off time one, after waiting delay back off time one, intercepts present channel again, if present channel is busy, repeats
Step 1, until network node intercepts the present channel free time；
Step 2：By random algorithm computation delay back off time two, intercepted again after waiting delay back off time two
Present channel repeats step 2 if present channel is busy, until network node intercepts the present channel free time；
Step 3：Network node sends present node data by present channel to host.
Preferably, random algorithm is binary system index type back off algorithm, is included the following steps：
Step 101：The time that basic back off time 2t is present node data round trip between slave and host is defined,
Define collisions parameter k=Min [conflict number, 10], wherein conflict number is to listen to the busy number of present channel；
Step 102：Computation delay back off time T, calculation formula are：T=r*2t；
Wherein, random back index r is one taken out at random from discrete integer set [0,1,2 ... ..., 2^k-1]
A number.
Preferably, when conflict number is 16 times, random back index r takes 1023*2t.
Preferably, after conflict number is more than 16 times, network node abandons present node data, at this time will not be to host report
It accuses, the data that the last time sends will be dropped, and module indicates application layer by pin level, this transmission failure.
Preferably, ranging from (0~52377.6) microsecond of delay back off time T.
Preferably, network node uses hopping, the hopping to include the following steps when networking：：
Step 201：Network is added in the request of terminal node common channel；
Step 202：Gateway device distributes present node working channel sequence according to the MAC Address of present node；
Step 203：Present node inquires neighbors working channel sequence in terminal node common channel, if neighbors works
Channel is identical as present node working channel sequence, and present node re-request gateway device distributes channel sequence, gateway device
According to the MAC Address of present node a pseudo-random channels sequence is distributed for it.
Preferably, gateway device informs the next common signal channel of present node while distributing channel for present node
Residence time and dwell period, and the next dwell period interval of oneself is updated in each dwell period；Present node exists
When the channel transmission data of oneself, the residence time and dwell period informed according to gateway device connect to terminal node common channel
Receive the inquiry message of gateway device synchronizing information and other nodes for asking to network.
Preferably, the modulation system of network-building method is GFSK Gaussian Frequency Shift Keying (GFSK)+Direct Sequence Spread Spectrum (DSSS),
The equipment for sending and receiving data uses hardware Forward Error Correction algorithm (FEC).
Preferably, in delay back off time one and delay back off time two, equipment receiver and outside are set present node
It is standby to be in closed state.
Preferably, before network node sends present node data to host in step 3, first request transmission report is sent to host
Literary (RTS) waits for host response to allow to start to send present node data again after sending message (CTS).Due to RTS-CTS packages
All very littles, so the invalid expense of transmission is negligible.
Claims (9)
1. a kind of remote network-building method of low-power consumption is based on CSMA/CA Channel Access Mechanisms, it is characterised in that including following step
Suddenly：
Step 1：Whether network node intercepts present channel occupied；If present channel is busy, pass through random algorithm computation delay
Back off time one after waiting delay back off time one, intercepts present channel again, if present channel is busy, repeats step
1, until network node intercepts the present channel free time；
Step 2：By random algorithm computation delay back off time two, intercepted again after waiting delay back off time two current
Channel；
Step 3：If it is busy to intercept present channel for network node in step 2, step 1 is returned to；If being intercepted in step 1 and step 2
Present channel is idle, sends present node data to host by present channel immediately.
2. the remote network-building method of a kind of low-power consumption according to claim 1, it is characterised in that：The random algorithm is
Binary system index type back off algorithm, the binary system index type back off algorithm include the following steps：
Step 101：Define the time that basic back off time 2t is present node data round trip between slave and host, definition
Collisions parameter k=Min [conflict number, 10], wherein conflict number is to listen to the busy number of present channel；
Step 102：Computation delay back off time T, calculation formula are：T=r*2t；
Wherein, random back index r is the number taken out at random from discrete integer set [0,1,2 ... ..., 2^k-1]
Word.
3. the remote network-building method of a kind of low-power consumption according to claim 2, it is characterised in that：When conflict number is more than 16
After secondary, present node data are abandoned.
4. the remote network-building method of a kind of low-power consumption according to claim 2, it is characterised in that：When the delay is kept out of the way
Between T ranging from (0~52377.6) microsecond.
5. the remote network-building method of a kind of low-power consumption according to claim 1, it is characterised in that network node is when networking
Using hopping, the hopping includes the following steps：
Step 201：Network is added in the request of terminal node common channel；
Step 202：Gateway device distributes present node working channel sequence according to the MAC Address of present node；
Step 203：Present node inquires neighbors working channel sequence in terminal node common channel, if neighbors working channel
It is identical as present node working channel sequence, present node re-request gateway device distribute channel sequence, gateway device according to
The MAC Address of present node distributes a pseudo-random channels sequence for it.
6. the remote network-building method of a kind of low-power consumption according to claim 6, it is characterised in that gateway device is being current
Node informs residence time and the dwell period of the next common signal channel of present node while distributing channel, and in each stop
The next dwell period interval of oneself is updated in period；Present node is set in the channel transmission data of oneself according to gateway
The standby residence time informed and dwell period receive gateway device synchronizing information to terminal node common channel and other are asking
Seek the inquiry message of the node of networking.
7. the remote network-building method of a kind of low-power consumption according to claim 1, it is characterised in that the network-building method
Modulation system is GFSK Gaussian Frequency Shift Keying (GFSK)+Direct Sequence Spread Spectrum (DSSS), and the equipment for sending and receiving data makes
With hardware Forward Error Correction algorithm (FEC).
8. the remote network-building method of a kind of low-power consumption according to claim 1, it is characterised in that present node is moved back in delay
It keeps away in time one and delay back off time two, equipment receiver and external equipment are in closed state.
9. the remote network-building method of a kind of low-power consumption according to claim 1, it is characterised in that in step 3 network node to
Before host sends present node data, request transmission message (RTS) first is sent to host, host response is waited for allow to send message
(CTS) start to send present node data again after.
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