CN105657845A - Vacant frequency spectrum Internet of things communication system and communication method thereof - Google Patents
Vacant frequency spectrum Internet of things communication system and communication method thereof Download PDFInfo
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- CN105657845A CN105657845A CN201610102362.0A CN201610102362A CN105657845A CN 105657845 A CN105657845 A CN 105657845A CN 201610102362 A CN201610102362 A CN 201610102362A CN 105657845 A CN105657845 A CN 105657845A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a vacant frequency spectrum Internet of things communication system and a communication method thereof. The system comprises a vacant frequency spectrum database, a vacant frequency spectrum frequency-band selection module, an upper and lower channel sub-carrier self-adaption module and a UNB communication module. The vacant frequency spectrum Internet of things communication system and the communication method thereof have the advantages that the technologies of scanning detection, frequency hopping and Ultra Narrow Band (UNB) are utilized, the cleaner frequency band of a television vacant frequency spectrum is utilized, the signal cover range with several kilometers or above is provided, the Internet of things communication requirement of several kilometers or above can be met, therefore, the cost of terminal hardware equipment and a network is reduced, the power consumption of a communication terminal is low, and the power supply environment of a button battery for an environment without a power supply is met.
Description
Technical field
The invention belongs to DTV and wireless communication technology field. It is specifically related to a kind of white frequency spectrum Internet of Things communication system and communication means thereof.
Background technology
Existing wireless Internet of Things communication system, in-plant several meters of tens meters of categories, the ZIGBEE mainly used, WiFi technology, slightly a little further can only be the technology of mobile operator. Really, from present case, mobile operator can be confident. Their 2G, 3G network are the main bearer networks of current Internet of Things. But accessing this network, cost of equipment is high, also to collect the communication cost of costliness, before Internet of Things accesses end face in a large number, access limited amount.
At present, due to the high speed development of technology, Chinese broadcasting and TV is converted by simulation-to-digital just comprehensively, so will discharge a large amount of uhf band (470��784MHz) resource. Uhf band signal compared with 2G 3G network signal have more penetrance, transmission range is farther, and clean interference is few, is beneficial to the communication of remote (hundreds of rice to several kilometers). Utilize this feature and relevant technology, an a kind of white frequency spectrum Internet of Things communication system of the novel network system that billions of equipment can be supported to send relatively fewer data at various time intervals, answer but raw.
Summary of the invention
The invention aims to overcome a kind of white frequency spectrum Internet of Things communication system of above-mentioned not enough offer and communication means thereof.
A kind of white frequency spectrum Internet of Things communication system, including with lower part: white frequency spectrum data storehouse 100, for providing local wireless access frequency and frequency range to base station 1; White frequency spectrum bands chooses module 200, for choosing a frequency band terminal 2 and communicate by scanning white frequency spectrum data storehouse; Upper and lower channel sub-carrier adaptation module 300, for a white frequency spectrum bands is decomposed into multiple subcarrier, terminal 2, when to communicate, selects a subcarrier to send information; UNB communication module 400, for realizing the communication between terminal 2 and base station 1.
The communication means of described white frequency spectrum Internet of Things communication system is:
001, terminal 2 is when needs transmission information, and by white frequency spectrum Internet of Things communication system, radio node and base station 1 radio node of terminal 2 are carried out networking;
002, it is judged that whether above-mentioned networking is successful, if it is turns next step, if otherwise returning previous step to continue the step of networking;
003, base station 1 obtains the frequency in the signal cover of base station 1 and band information by scanning white frequency spectrum data storehouse 100;
004, choose the module 200 frequency in the signal cover of base station 1 by white frequency spectrum bands and frequency range is chosen a white frequency spectrum bands;
005, by upper and lower channel sub-carrier adaptation module 300, choose in step 004 white frequency spectrum bands is decomposed into multiple subcarrier, terminal 2 is when to communicate, upper and lower channel sub-carrier adaptation module 300 automatically selects the subcarrier carrying out data transmission, after terminal 2 transmission information, same subcarrier waits base station 1 is sent to the information of terminal 2 by UNB communication module 400;
006, terminal 2, before the information of carrying out transmission, first selects a subcarrier, has detected whether that other terminal 2 is in the information of carrying out transmission, if it has, be selected by next subcarrier, if it did not, just use this subcarrier to carry out information transmission.
Described terminal 2 transmits identical information on 2-10 different subcarrier.
Described each subcarrier bandwidth range for 5Hz to 500Hz.
Frequency in described step 003 and band information be following every at least one:
Available frequency band;
Long grant frequency range;
Short grant frequency range;
Described step 004 particularly as follows:
White frequency spectrum bands is chosen module 200 and is prestored the user profile of each terminal 2;
Then, white frequency spectrum bands is chosen module 200 by the frequency range in the signal cover of base station 1 according to available priorities, carry out order arrangement from high to low;
Finally, the required user profile of communication terminal 2 and the usable range of frequency range are compared, selects the frequency range used by this terminal.
The user profile of each terminal 2 described be following every at least one:
Cover time needed for terminal 2;
Covering signal intensity needed for terminal 2;
The type of service of terminal 2;
Described step 005 particularly as follows:
Upper and lower channel sub-carrier adaptation module 300 calculates the weights scope of required subcarrier according to the user profile of terminal 2, then within the required range whether the weights of the subcarrier carrying out data transmission that judgement to select, if it is this subcarrier is selected to carry out data transmission, if the weights of subcarrier are not within the required range, then carry out next subcarrier to judge, until choosing the subcarrier in scope.
Advantages of the present invention has: make use of Scanning Detction, frequency hopping, ultra-narrow band (UltraNarrowBand, UNB) technology, utilize the frequency range that the white Frequency spectrum ratio of TV is cleaner, the signal cover with more than several kilometers is provided, the Internet of Things communication requirement of more than several kilometers can be solved, thus reducing the cost at terminal hardware and networking, and communication terminal is low in energy consumption, meets the environment that non-transformer environment button cell is powered.
Accompanying drawing explanation
Fig. 1 is the structural representation of communication system of the present invention.
Fig. 2 is operating diagram.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further illustrated:
A kind of white frequency spectrum Internet of Things communication system, including with lower part: ISM authorization center 100, is used for authorizing ISM band; ISM band chooses module 200, is used for choosing an ISM band; The adaptively selected module 300 of upper and lower channel sub-carrier, for an ISM band is decomposed into multiple subcarrier, terminal, when to communicate, selects a subcarrier to send information; UNB communication module 400, for realizing the communication between terminal and base station.
The communication means of described white frequency spectrum Internet of Things communication system is:
001, terminal 2 is when needs transmission information, and by white frequency spectrum Internet of Things communication system, radio node and base station 1 radio node of terminal 2 are carried out networking;
002, it is judged that whether above-mentioned networking is successful, if it is turns next step, if otherwise returning previous step to continue the step of networking;
003, base station 1 obtains the frequency in the signal cover of base station 1 and band information by scanning white frequency spectrum data storehouse 100;
004, choose the module 200 frequency in the signal cover of base station 1 by white frequency spectrum bands and frequency range is chosen a white frequency spectrum bands;
005, by upper and lower channel sub-carrier adaptation module 300, choose in step 004 white frequency spectrum bands is decomposed into multiple subcarrier, terminal 2 is when to communicate, upper and lower channel sub-carrier adaptation module 300 automatically selects the subcarrier carrying out data transmission, after terminal 2 transmission information, same subcarrier waits base station 1 is sent to the information of terminal 2 by UNB communication module 400;
006, terminal 2, before the information of carrying out transmission, first selects a subcarrier, has detected whether that other terminal 2 is in the information of carrying out transmission, if it has, be selected by next subcarrier, if it did not, just use this subcarrier to carry out information transmission.
Described terminal 2 transmits identical information on 2-10 different subcarrier.
Described each subcarrier bandwidth range for 5Hz to 500Hz.
Frequency in described step 003 and band information be following every at least one:
Available frequency band;
Long grant frequency range;
Short grant frequency range;
Described step 004 particularly as follows:
White frequency spectrum bands is chosen module 200 and is prestored the user profile of each terminal 2;
Then, white frequency spectrum bands is chosen module 200 by the frequency range in the signal cover of base station 1 according to available priorities, carry out order arrangement from high to low;
Finally, the required user profile of communication terminal 2 and the usable range of frequency range are compared, selects the frequency range used by this terminal.
The user profile of each terminal 2 described be following every at least one:
Cover time needed for terminal 2;
Covering signal intensity needed for terminal 2;
The type of service of terminal 2;
Described step 005 particularly as follows:
Upper and lower channel sub-carrier adaptation module 300 calculates the weights scope of required subcarrier according to the user profile of terminal 2, then within the required range whether the weights of the subcarrier carrying out data transmission that judgement to select, if it is this subcarrier is selected to carry out data transmission, if the weights of subcarrier are not within the required range, then carry out next subcarrier to judge, until choosing the subcarrier in scope.
The frequency spectrum that native system uses is the white frequency spectrum bands of TV, maximum feature is to adopt frequency hopping, the transmission of TV is avoided interference by frequency hopping, its terminal can in all of local access, the access of terminal completes to access and certification by scanning the wireless access frequency of locality, its base station, by accessing local white frequency spectrum data storehouse and selecting the frequency range the cleanest, anti-interference is the strongest with other terminal communication by scanning the wireless access frequency of locality, uses the system of TAS-FDMA access mode to include base station and terminal two parts. Wherein, has at least a base station, it is possible to have many terminals. In communication, adopt the mode sharing frequency spectrum, 1,000,000 terminals can be held in theory.
And, the present invention adopts super narrow-band technologies, is particularly suitable for covering, low speed, low cost and low-power consumption on a large scale.
Wherein, being made without the synchronization in time or frequency between base station and terminal, terminal, when needs transmission information, oneself automatically selects the subcarrier carrying out data transmission, rather than is specified by base station or network, reduce the complexity of system. After terminal transmission information, it is possible to waiting the information being sent to terminal of base station on same subcarrier, the time of wait is fixing. Different with general FDMA/TDMA/CDMA access mode, terminal only when needs transmission information, is just connected to base station. And, this connection is real-time, it does not have postpone. Information in order to ensure communication must be passed on, and terminal will be transmitted repeatedly on different subcarriers, is usually and transmits identical information on 2-10 different subcarrier. So, it is also possible to the collision when avoiding different terminals to send out in information. Being multiple subcarrier by one section of spectrum imaging, each subcarrier bandwidth is very little, thus forming ultra-narrow band. The bandwidth of ultra-narrow band is at 5Hz to 1KHz. Typical in 5Hz to 500Hz. Each subcarrier can be that a terminal uses, it is also possible to is that multiple terminal uses simultaneously and will not produce collision. Different with general FDMA is that a kind of terminal automatically selects FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) technology, and the distribution of subcarrier is not undertaken by base station or network, but what terminal oneself selected. Terminal, when needs transmission information, oneself selects a subcarrier to carry out the transmission of information. Terminal is also only just connected to base station or network when needs transmission information. Terminal is when to carry out information transmission, on carrier wave selects, in order to reduce possible collision, after selecting a subcarrier, can detect whether that other terminal is in the information of carrying out transmission, if it has, be selected by next subcarrier, if it did not, just use this subcarrier to carry out information transmission.
And the present invention adopts SDR technology, it is possible to quickly realize radio communication. Terminal automatically selects FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) implementation one, and each terminal uses a specific subcarrier to communicate. Terminal automatically selects FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) implementation two, and which subcarrier that adopts time each terminal uses a particular sequence to determine transmission information carries out the transmission of information. Terminal automatically selects FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) implementation three is, each terminal, according to a generator randomly or pseudo-randomly, determines terminal just carries out information transmission with which subcarrier when the information of transmission. Terminal automatically selects FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) implementation four is, if the frequency spectrum that Frequency spectrum ratio subcarrier actually used when terminal transmission information occupies is much smaller, so, can in a subcarrier, multiple terminals can be shared a subcarrier simultaneously and carry out the transmission of information. Terminal automatically selects FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) implementation still can automatically select FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) implementation with other terminal and combines.
In order to dynamic use idle television broadcast band, base station and client device all must have the ability to detect the existence whether having main users. ��?dimple �� is coated with prominent �� pine uncut jade and pays anxious the box upper arm waterside raw meat ? Geld �� Huang Di ? GlobalPositioningSystem, GPS), client device must first inform the geographical position of self before being linked to base station. Therefore base station and terminal have double antenna, and one is the antenna of GPS, and one is the antenna of white spectrum wireless communication. Then, base station is through access frequency range utilizability data base (ChannelAvailabilityDatabase), available frequency band list (AvailableChannelList) is obtained to judge to have which frequency range can use (being likely to the frequency range left unused) in current Nidus Vespae according to the geographical position that base station and client device are current, and to have which frequency range be definitely can not use (frequency range that main users is currently in use), the access in white frequency spectrum data storehouse. Base station can scan the frequency range being likely to leave unused, and determines which frequency range is real idle. Finally, base station can select a frequency range as running frequency range (OperatingChannel) from idle frequency range, and selects a frequency range as standby frequency range (BackupChannel). Running frequency range is the frequency range that base station mainly provides service, and standby frequency range is the frequency range that the secondary user's in these Nidus Vespaes all to be transformed into when there being main users to occur. Terminal scanning, to this frequency range, finds out the frequency sub-band of blank, starts to communicate with base station, completes data transmission.
When a terminal needs transmission information time, just automatically select a subcarrier and be transmitted, automatically select FDMA (TAS-FDMA, TerminalAutoSelectionFDMA) referred to herein as terminal, such as attached Fig. 1 and 2. FDMA (TAS-FDMA is automatically selected in terminal, TerminalAutoSelectionFDMA) in, the selection of subcarrier has many modes, and the target of these modes seeks to ensure time many terminals to send information, the probability of only minimum collision. Access mode one: to one unique subcarrier of each terminal distribution. So, under a honeycomb, it is possible to have 2000 terminals. Because in reality, M2M terminal is sending when information, and 30 minutes to one week or longer time simply send primary information often, and therefore, the most of the time, most subcarrier is idle. This scheme is not a kind of good scheme. Access mode two: to the sequence of each one sub-carrier selection of terminal distribution, each terminal chooses the subcarrier to be transmitted according to this sequence. Such as, a given sequence, 1,3,8,12,200 ... ..., 1149, interrupt just selecting, according to this sequence, the subcarrier to be transmitted, to last subcarrier, such as 1149, the subcarrier that the next one to be transmitted is exactly 1. so go round and begin again. The feature of this mode is, multiple terminals can share a subcarrier in time, because, in reality, M2M terminal is sending when information, and 30 minutes to one week or longer time simply send primary information often, therefore, this mode is feasible. And, terminal quantity under each honeycomb can be a lot, such as each terminal sends primary information in 30 minutes, send primary information and need 2 seconds, then, if there being 2000 subcarriers, at its best, under each honeycomb, each subcarrier can hold 900 terminals, and whole honeycomb just can hold 1800000 terminals. And it is made without the extra expenses such as synchronization. Access mode three: each terminal produces a subcarrier to be transmitted according to a tandom number generator. This subcarrier randomly generates, in order to ensure minimum collision, it is ensured that random number produce it can be avoided that possible collision. The feature of this mode is, multiple terminals can share a subcarrier in time, because, in reality, M2M terminal is sending when information, and 30 minutes to one week or longer time simply send primary information often, therefore, this mode is feasible.And, terminal quantity under each honeycomb can be a lot, such as each terminal sends primary information in 30 minutes, send primary information and need 2 seconds, then, if there being 2000 subcarriers, at its best, under each honeycomb, each subcarrier can hold 900 terminals, and whole honeycomb just can hold 1800000 terminals. And it is made without the extra expenses such as synchronization. It is, of course, also possible to there are other modes many, but, main purpose is exactly at utmost reduce when selecting subcarrier time terminal sends, and produces the probability of collision.
Present invention utilizes Scanning Detction, frequency hopping, ultra-narrow band (UltraNarrowBand, UNB) technology, utilize the frequency range that the white Frequency spectrum ratio of TV is cleaner, the signal cover with more than several kilometers is provided, the Internet of Things communication requirement of more than several kilometers can be solved, thus reducing the cost at terminal hardware and networking, and communication terminal is low in energy consumption, meets the environment that non-transformer environment button cell is powered.
Claims (8)
1. a white frequency spectrum Internet of Things communication system, it is characterised in that include with lower part: white frequency spectrum data storehouse (100), for providing local wireless access frequency and frequency range to base station (1); White frequency spectrum bands chooses module (200), for choosing the communication of frequency band terminal (2) by scanning white frequency spectrum data storehouse; Upper and lower channel sub-carrier adaptation module (300), for a white frequency spectrum bands is decomposed into multiple subcarrier, terminal (2), when to communicate, selects a subcarrier to send information; UNB communication module (400), is used for realizing the communication between terminal (2) and base station (1).
2. white frequency spectrum Internet of Things communication system according to claim 1, its communication means is:
001, terminal (2) is when needs transmission information, and by white frequency spectrum Internet of Things communication system, radio node and base station (1) radio node of terminal (2) are carried out networking;
002, it is judged that whether above-mentioned networking is successful, if it is turns next step, if otherwise returning previous step to continue the step of networking;
003, base station (1) obtains the frequency in the signal cover of base station (1) and band information by scanning white frequency spectrum data storehouse (100);
004, choose the module (200) frequency in the signal cover of base station (1) by white frequency spectrum bands and frequency range is chosen a white frequency spectrum bands;
005, by upper and lower channel sub-carrier adaptation module (300), choose in step 004 white frequency spectrum bands is decomposed into multiple subcarrier, terminal (2) is when to communicate, upper and lower channel sub-carrier adaptation module (300) automatically selects the subcarrier carrying out data transmission, after terminal (2) transmission information, same subcarrier waits base station (1) is sent to the information of terminal (2) by UNB communication module (400);
006, terminal (2), before the information of carrying out transmission, first selects a subcarrier, detect whether that other terminal (2) is in the information of carrying out transmission, if it has, be selected by next subcarrier, if it did not, just use this subcarrier to carry out information transmission.
3. a kind of white frequency spectrum Internet of Things communication means according to claim 2, it is characterised in that described terminal (2) transmits identical information on 2-10 different subcarrier.
4. a kind of white frequency spectrum Internet of Things communication means according to Claims 2 or 3, it is characterised in that described each subcarrier bandwidth range for 5Hz to 500Hz.
5. a kind of white frequency spectrum Internet of Things communication means according to claim 2, it is characterised in that frequency in described step 003 and band information be following every at least one:
Available frequency band;
Long grant frequency range;
Short grant frequency range.
6. a kind of white frequency spectrum Internet of Things communication means according to claim 2, it is characterised in that described step 004 particularly as follows:
White frequency spectrum bands is chosen module (200) and is prestored the user profile of each terminal (2);
Then, white frequency spectrum bands is chosen module (200) by the frequency range in base station (1) signal cover according to available priorities, carry out order arrangement from high to low;
Finally, the usable range of the user profile of required communication terminal (2) Yu frequency range is compared, selects the frequency range used by this terminal.
7. a kind of white frequency spectrum Internet of Things communication means according to claim 6, it is characterised in that the user profile of described each terminal (2) be following every at least one:
Cover time needed for terminal (2);
Covering signal intensity needed for terminal (2);
The type of service of terminal (2).
8. a kind of white frequency spectrum Internet of Things communication means according to claim 2 or 7, it is characterised in that described step 005 particularly as follows:
Upper and lower channel sub-carrier adaptation module (300) calculates the weights scope of required subcarrier according to the user profile of terminal (2), then within the required range whether the weights of the subcarrier carrying out data transmission that judgement to select, if it is this subcarrier is selected to carry out data transmission, if the weights of subcarrier are not within the required range, then carry out next subcarrier to judge, until choosing the subcarrier in scope.
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