CN107947829A - A kind of tdd communication systems and method of combination spread spectrum and arrowband MIMO - Google Patents
A kind of tdd communication systems and method of combination spread spectrum and arrowband MIMO Download PDFInfo
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- CN107947829A CN107947829A CN201711446888.1A CN201711446888A CN107947829A CN 107947829 A CN107947829 A CN 107947829A CN 201711446888 A CN201711446888 A CN 201711446888A CN 107947829 A CN107947829 A CN 107947829A
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- arrowband
- base station
- terminal
- slot synchronization
- synchronization information
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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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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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 kind of combination spread spectrum and the tdd communication systems and method of arrowband MIMO, system includes base station and terminal, and base station is equipped with mutiple antennas, and the terminal has multiple, and each terminal is single antenna, and the communication means between base station and terminal is：During downlink, base station sends signal to terminal using spread spectrum technic；During uplink, base station uses the signal that arrowband MIMO technology multiple antennas receiving terminal is sent；Base station sets arrowband slot synchronization information maximum retransmission interval, within the interval time, base station at least sends an arrowband slot synchronization information to terminal, terminal is after the arrowband slot synchronization information that base station is sent is received, determine the number of arrowband sub-slots in arrowband time slot, and starting and end time, select an arrowband sub-slots to send uplink signal.The present invention had both remained low-power consumption of the narrow band communication in Internet of Things web-based applications, the advantage of transmission range length, and the shortcomings that overcome its frequency selective fading.
Description
Technical field
The invention belongs to wireless communication field, is related to a kind of time division duplex radio communication method, and in particular to one kind combines
The tdd communication systems and method of spread spectrum and arrowband MIMO.
Background technology
Time division duplex (Time Division Duplex, referred to as " TDD ") is a kind of communication mode of mobile communication system,
This mode receiving and sending messages between the base station and the user equipment, is in the form of burst sequence, on the same channel
Alternately transmit, i.e., receiving-transmitting sides are sent out and received in turn, or " ping-pong ".One pair can be thus realized on one channel
Work channel, so as to improve the availability of frequency spectrum.The uplink communication of TDD is terminal sends signal to base station, downlink communication be base station to
Terminal sends signal.
For Internet of Things, a feature is exactly that data packet is smaller, but require it is low in energy consumption, therefore narrow band communication be ratio
Preferable selection, but it is exactly frequency selective fading that narrow band communication, which has a defect, therefore use narrow band communication, it is important to such as
What overcomes frequency selective fading, and currently used method has two kinds, and 1) spread spectrum communication, narrow band signal is expanded into broad frequency band
Signal, overcome frequency selective fading using frequency diversity；2) multi-antenna communication, narrow band signal, profit are received with mutiple antennas
Overcome frequency selective fading with antenna diversity.Spread spectrum communication is used merely, the drawback is that spectrum utilization efficiency is low, message capacity
It is low.Multi-antenna technology is used merely, the drawback is that multi-antenna communication is infeasible in downlink, during downlink, terminal is typically only capable to
Equip an antenna, it is impossible to carry out multi-antenna signal reception, therefore narrow band communication is used for also having many problems to need in Internet of Things
Solve.
The content of the invention
It is an object of the invention to provide a kind of arrowband that frequency selection decline can be effectively overcome in uplink and downlink communication
Wireless communication system and method.One key character of Internet of Things Network Communication is that uplink communication capacity is more than downlink communication capacity, on
It is larger to base station and network data reporting, data volume that row communication is used for terminal；And downlink communication is generally used only for base station and network
Response is sent to terminal and control information, data volume are smaller.Invention combines spread spectrum and arrowband MIMO (Multiple-Input
Multiple-Output, is Multiple Input Multiple Output) communication technology, spread spectrum technic is used for downlink, makes terminal in Dan Tian
Under line reception condition, frequency selective fading can be overcome；The arrowband MIMO communication technologys are used for uplink, base station mutiple antennas
Signal is received, while overcoming frequency selective fading, supports multiple terminals to send narrow band signal to base station at the same time, here arrowband
Signal refers to not by the signal of spread spectrum, so as to lift up-link capacity.In addition, the present invention gives the TDD for supporting above-mentioned technology
Relaying.
In order to achieve the above object, above-mentioned technical problem is solved, the technical solution adopted by the present invention is：
A kind of tdd communication systems of combination spread spectrum and arrowband MIMO, it is characterised in that including：
Base station, the base station are equipped with mutiple antennas, and during downlink, base station sends signal using spread spectrum technic single antenna,
During uplink, base station receives signal using arrowband MIMO technology multiple antennas.
Terminal, the terminal have it is multiple, it is corresponding with base station to pass through spread spectrum technic single-antenna received signal during downlink,
During uplink, each terminal sends narrow band signal by single antenna to base station, and narrow band signal refers to the signal for not passing through spread spectrum here,
Multiple terminals use arrowband MIMO technology transmission signal with base station.
As an improvement, base station sets arrowband slot synchronization information maximum retransmission interval, within the interval time, base station
An arrowband slot synchronization information is at least sent to terminal, terminal is after the arrowband slot synchronization information that base station is sent is received, really
Determine the number of arrowband sub-slots in arrowband time slot, and at the beginning of each arrowband sub-slots between and the end time, select one
Arrowband sub-slots send uplink signal；
As an improvement, terminal selection arrowband sub-slots method for：
Terminal when received signal power is higher, selects sequence according to the base station signal power selection arrowband sub-slots received
Number larger arrowband sub-slots.
As an improvement, in arrowband slot synchronization information maximum retransmission interval, base station uses a kind of or more in following method
Kind at least sends an arrowband slot synchronization information to terminal：
(1) arrowband slot synchronization information is sent in arrowband slot synchronization frame；
(2) in downlink acknowledgement frame carry arrowband slot synchronization information, i.e., in downlink acknowledgement frame, send response message it
Outside, also arrowband slot synchronization information is sent along band；
(3) in downlink data frame carry arrowband slot synchronization information, i.e., in downlink data frame, send downlink data it
Outside, also arrowband slot synchronization information is sent along band.
As an improvement, send arrowband slot synchronization frame, downlink acknowledgement frame and the downlink data frame of arrowband slot synchronization information
Spread using maximum spread spectrum multiple.
As an improvement, downlink acknowledgement frame carries out multiple terminals response at the same time, that is, merge the reply data to multiple terminals
In in a downlink acknowledgement frame, the spread spectrum multiple for the downlink acknowledgement frame that base station is sent is set to required for the terminal of worst signal quality
Spread spectrum multiple.
As an improvement, the mode that uses of terminal searching base station operation channel for：Terminal-pair base station listening period is more than arrowband
Slot synchronization information maximum retransmission interval, if having received arrowband slot synchronization information, have found working channel；Otherwise, cut
Next possible base station operation channel is changed to continue to monitor；If finding multiple working channels, selection receives base station signal work(
The most strong working channel of rate.
As an improvement, further including TDD relayings, the TDD relayings include for the antenna A with base station transceiver communication, are used for
With antenna B, upstream amplifier and the downstream amplifier of terminal transmitting-receiving communication, the antenna A and antenna B are by switching A and switch B
Switching is connected with upstream amplifier or downstream amplifier, and uplink signal and downlink are believed by upstream amplifier and downstream amplifier
Number carry out relaying amplification；TDD relayings are usually operated in downstream state, by receiving the arrowband slot synchronization frame from base station, or
Person carries the downlink acknowledgement frame and downlink data frame of arrowband slot synchronization information, determines the number of arrowband sub-slots, and each
Between at the beginning of arrowband sub-slots and the end time, and uplink state is switched in arrowband slot time.
As an improvement, in each arrowband sub-slots, multiple terminals are to base station transmission packet, and each data packet is using narrow
Band single-carrier modulated mode is modulated；The form that the terminal transmits data in arrowband sub-slots is pilot signal plus row
Synchronizing sequence adds coding data sequences again, and wherein pilot signal is single frequency signal, and uplink synchronous sequence, which is one, to be had well
The sequence of autocorrelation performance.
A kind of time division duplex communication method of combination spread spectrum and arrowband MIMO, it is characterised in that：During downlink, base station is using expansion
The frequency communication technology sends signal to terminal, and base station and terminal are received and dispatched using single antenna；During uplink, base station uses arrowband MIMO skills
The signal that art receiving terminal is sent, the multiple antennas of multiple terminal composition transmitting terminals, base station is received using multiple antennas.
As an improvement, base station sets arrowband slot synchronization information maximum retransmission interval, within the interval time, base station
An arrowband slot synchronization information is at least sent to terminal, terminal is after the arrowband slot synchronization information that base station is sent is received, really
Determine the number of arrowband sub-slots in arrowband time slot, and at the beginning of each arrowband sub-slots between and the end time, select one
Arrowband sub-slots send uplink signal.
The beneficial effects of the invention are as follows：
Present invention incorporates spread spectrum and the arrowband MIMO communication technologys, spread spectrum technic is used for downlink, makes terminal in list
Under antenna reception condition, frequency selective fading can be overcome；The arrowband MIMO communication technologys are used for uplink, the multiple days in base station
Line receives signal, while overcoming frequency selective fading, supports multiple terminals to send signal to base station at the same time, so as to be lifted
Row capacity.The present invention had both remained low-power consumption of the narrow band communication in Internet of Things web-based applications, the advantage of transmission range length, and overcame
The shortcomings that its frequency selective fading so that the practicality of technology of Internet of things further develops.
Brief description of the drawings
Fig. 1 is three kinds of arrowband slot synchronization method for sending information and arrowband time slot schematic diagram of the invention.
Fig. 2 relays schematic diagram for TDD.
Fig. 3 is the form that terminal transmits data in arrowband sub-slots
Embodiment
The present invention is illustrated below in conjunction with the accompanying drawings.
It is pointed out that the noun defined in present patent application be subject to the present invention definition, undefined noun with
Subject to industry universal understands.
A kind of tdd communication systems of combination spread spectrum and arrowband MIMO, including base station and terminal, base station are equipped with multiple
Antenna, the terminal have multiple, and each terminal is single antenna, and the communication means between base station and terminal is：During downlink, base station
Signal is sent using spread spectrum technic to terminal, base station and terminal all use single antenna；One example：Spread spectrum communication uses
The LoRa communication technologys, LoRa be a kind of long range of Semtech companies exploitation, low-power consumption, spread spectrum, the physical layer that is wirelessly transferred
The communication technology；During uplink, terminal sends signal to base station, and terminal sends narrow band signal using single antenna, and narrow band signal refers to here
The signal that arrowband MIMO technology multiple antennas receiving terminal is sent is not used by the signal of spread spectrum, base station；
Downlink uses spread spectrum technic, and spreading factor, channel matter are selected according to the communication channel quality of terminal and base station
Measure poor, select larger spreading factor, channel quality is preferable, selects less spreading factor.One example：Spreading factor is most
Small is 1, is up to 12, respectively corresponding spread spectrum multiple 2 to 212Times.
Uplink can be remained still using this option of spread spectrum for some old terminals, thus it is compatible with new terminal,
In uplink uses broadband communication technology, terminal can select random time to send uplink signal, i.e. ascending time slot can basis
Need any selection.
Terminal for sending uplink signal using MIMO technology, base station set the maximum weight of an arrowband slot synchronization information
Hair interval, within the interval time, base station at least sends an arrowband slot synchronization information to terminal, and terminal is receiving base station hair
After the arrowband slot synchronization information gone out, the number of arrowband sub-slots in arrowband time slot is determined, and each arrowband sub-slots are opened
Begin time and end time, select an arrowband sub-slots to send uplink signal, this mode ensure that multiple terminals are sent to
The signal of base station is alignment in time, so as to make full use of the multiple user signals receiving ability of arrowband MIMO, lifting
Up-link capacity；One example：As shown in Figure 1, after arrowband slot synchronization frame, there is provided three arrowband sub-slots, are respectively
Arrowband sub-slots 1,2,3, the length of three arrowband sub-slots is 330ms, 150ms and 100ms respectively.
Arrowband time slot is ascending time slot, in this technology ascending time slot and descending time slot distribution be not fixed, choosing as needed
Select.
The method that terminal selects arrowband sub-slots：Terminal according to the base station signal power selection arrowband sub-slots received,
When received signal power is higher, the larger arrowband sub-slots of sequence number are selected.One example：The base station signal power that terminal receives
During more than or equal to -90dBm, arrowband sub-slots 3 are selected；When being less than -90dBm more than or equal to -120dBm, arrowband sub-slots 2 are selected；
During less than -120dBm, arrowband sub-slots 1 are selected.
In arrowband slot synchronization information maximum retransmission interval, method of the base station to terminal transmission arrowband slot synchronization information
For one or more in following three method：
(1) arrowband slot synchronization information is sent in arrowband slot synchronization frame；
(2) in downlink acknowledgement frame carry arrowband slot synchronization information, i.e., in downlink acknowledgement frame, send response message it
Outside, also arrowband slot synchronization information is sent along band；
(3) in downlink data frame carry arrowband slot synchronization information, i.e., in downlink data frame, send downlink data it
Outside, also arrowband slot synchronization information is sent along band；
As a kind of more preferably embodiment, arrowband slot synchronization frame, the downlink acknowledgement frame of transmission arrowband slot synchronization information
Spread with downlink data frame using maximum spread spectrum multiple, this mode can ensure all terminals in base station range
Arrowband slot synchronization information can be received.One example：Send arrowband slot synchronization frame, the downlink of arrowband slot synchronization information
Acknowledgement frame and downlink data frame use spreading factor 12.
As one kind, more preferably embodiment, downlink acknowledgement frame carry out response to multiple terminals at the same time, that is, merge to multiple ends
For the reply data at end in a downlink acknowledgement frame, the spread spectrum multiple that base station sends downlink acknowledgement frame is set to worst signal quality
The required spread spectrum multiple of terminal, so as to ensure that multiple terminals can receive reply data.This mode can improve response
Efficiency.One example：At the same time to three terminal responds, the spreading factor that these three terminals are respectively necessary for is 7,8 and 10, then is closed
And acknowledgement frame use spreading factor 10.
In the case that terminal does not know the working channel of base station, terminal needs search base station, this process is known as network
Search.The mode that terminal searching base station operation channel uses for：Terminal-pair base station listening period is more than arrowband slot synchronization information
Maximum retransmission interval, if having received arrowband slot synchronization information, have found working channel；Otherwise, next possibility is switched
Base station operation channel continue to monitor；If finding multiple working channels, selection receives the most strong work of base station signal power
Channel.
As a kind of more preferably embodiment, in order to spread over distance, in addition to base station and terminal, TDD relayings are introduced, such as
Shown in Fig. 2, TDD relaying includes being used for the antenna A of base station transceiver communication, for the antenna B with terminal transmitting-receiving communication,
Row amplifier and downstream amplifier, the antenna A and antenna B are put by switching A and switch B switchings with upstream amplifier or downlink
Big device is connected, and relaying amplification is carried out to uplink signal and downlink signal by upstream amplifier and downstream amplifier.The relaying exists
Downgoing time section, after the signal sent received from the base station of antenna A is amplified, is transmitted to terminal, in upstream time by antenna B
Section, after the signal sent received from the terminal of antenna B is amplified, base station is transmitted to by antenna A.
The uplink and downlink switching of TDD relayings, by switch A and switch B, switch A and switch B be for single-pole double-throw switch (SPDT),
Downstream state, switch A and switch B are connected to downstream amplifier, uplink state, and switch A and switch B are connected to upstream amplifier.
TDD relayings are usually operated in downstream state, by receiving the arrowband slot synchronization frame from base station, or carry narrow
Downlink acknowledgement frame and downlink data frame with slot synchronization information, determine the number of arrowband sub-slots in arrowband time slot, and often
Between at the beginning of a arrowband sub-slots and the end time, and uplink state is switched in arrowband slot time.
In each arrowband sub-slots, multiple terminals use arrowband single carrier to base station transmission packet, each data packet
Modulation system is modulated；As shown in figure 3, the form that the terminal transmits data in arrowband sub-slots adds for pilot signal
Row synchronizing sequence adds coding data sequences again, and wherein pilot signal is single frequency signal, and uplink synchronous sequence is one with good
The sequence of good autocorrelation performance.
The uplink synchronous sequence and coding data sequences all using MSK, GMSK, OQPSK, pi/2-BPSK, QPSK,
Any one method modulation in 16QAM and 64QAM.
Terminal random selection centre frequency transmitting upstream data, so as to ensure that the centre frequency of multiple terminals is as mutual as possible
Stagger.
The pilot signal that base station is sent in arrowband sub-slots, detection terminal, and according to the son of pilot signal acquisition terminal
Channel center frequency, specific acquisition methods are：The pilot signal that base station receives all antennas is done J point Fourier transformations and is denoted as
Vector Si, SiThe Fourier transformation of i-th of antenna branch is represented as a result, the Fourier transformation result that each antenna receives is taken absolutely
Value is carried out again square, be afterwards denoted as the results added of all antenna branchWherein, ABS2(Si)
Represent SiIn all elements take absolute value after again square；Then according to the threshold value of default, the peak value in E is judged
Position, be denoted as n1,n2…,nK, K is the peak value number being detected, and each peak value corresponds to the terminal of a transmitting signal, it
The subchannel centre frequency of each terminal is obtained according to formula below afterwards；fsTo be
System sample rate, the subchannel centre frequency for obtaining each terminal are denoted as f1,f2…,fK。
The method that base station carries out terminal channel estimation is as follows：
According to k-th terminal-pair should in E peak value position nk, k=1,2 ..., K, k is natural number, to all antenna branch
The Fourier transformation result on road：S1,S2,…SM, take n-thkA element, and merge into vector hk, as terminal k is to each antenna in base station
Channel response,hkDimension is：M rows, 1 row, M is base station reception antenna number,Represent vector Si
nkA element.
Base station to terminal carry out beam forming receive process in, according to the channel response of this terminal using conjugation, force zero or
Person's minimum mean square error method carries out wave beam forming, is received so as to fulfill to the MIMO of multiple terminals.
The terminal signaling that base station receives beam forming carries out narrow-band filtering, recovers it and sends signal.
The above is the preferred example of the present invention, does not make limitation in any form to the present invention, every according to this
Any simple modification, equivalent change and modification that the technical spirit of invention makees above example, each falls within the protection of the present invention
Within the scope of.
Claims (17)
- A kind of 1. tdd communication systems of combination spread spectrum and arrowband MIMO, it is characterised in that including：Base station, the base station are equipped with mutiple antennas, and during downlink, base station sends signal, uplink using spread spectrum technic single antenna When, base station receives signal using arrowband MIMO technology multiple antennas；Terminal, the terminal have it is multiple, it is corresponding with base station to pass through spread spectrum technic single-antenna received signal, uplink during downlink When, each terminal sends narrow band signal by single antenna to base station, and multiple terminals are believed with base station using the transmission of arrowband MIMO technology Number.
- 2. tdd communication systems as claimed in claim 1, it is characterised in that：Base station sets an arrowband slot synchronization letter Maximum retransmission interval is ceased, within the interval time, base station at least sends an arrowband slot synchronization information to terminal, and terminal is being received After the arrowband slot synchronization information sent to base station, the number of arrowband sub-slots in arrowband time slot, and each arrowband are determined Between at the beginning of time slot and end time, one arrowband sub-slots of selection send uplink signal.
- 3. tdd communication systems as claimed in claim 2, it is characterised in that：The method that terminal selects arrowband sub-slots For：Terminal is according to the base station signal power selection arrowband sub-slots received, when received signal power is high, selects sequence number big Arrowband sub-slots.
- 4. tdd communication systems as claimed in claim 2, it is characterised in that：In arrowband slot synchronization information maximum retransmission In interval, base station uses one or more in following method at least to send an arrowband slot synchronization information to terminal：(1) arrowband slot synchronization information is sent in arrowband slot synchronization frame；(2) arrowband slot synchronization information is carried in downlink acknowledgement frame, i.e., in downlink acknowledgement frame, is sent outside response message, Also arrowband slot synchronization information is sent along band；(3) arrowband slot synchronization information is carried in downlink data frame, i.e., in downlink data frame, is sent outside downlink data, Also arrowband slot synchronization information is sent along band.
- 5. tdd communication systems as claimed in claim 4, it is characterised in that：Send the arrowband of arrowband slot synchronization information Slot synchronization frame, downlink acknowledgement frame and downlink data frame are spread using maximum spread spectrum multiple.
- 6. tdd communication systems as claimed in claim 4, it is characterised in that：Downlink acknowledgement frame at the same time to multiple terminals into Row response, that is, merge to the reply data of multiple terminals in a downlink acknowledgement frame, base station sends the spread spectrum of downlink acknowledgement frame Multiple is set to the required spread spectrum multiple of terminal of worst signal quality.
- 7. tdd communication systems as claimed in claim 2, it is characterised in that：What terminal searching base station operation channel used Mode is：Terminal-pair base station listening period is more than arrowband slot synchronization information maximum retransmission interval, if having received arrowband time slot Synchronizing information, then have found working channel；Otherwise, switch next possible base station operation channel to continue to monitor；If find Multiple working channels, then selection receive the most strong working channel of base station signal power.
- 8. tdd communication systems as claimed in claim 2, it is characterised in that：Further include TDD relayings, the TDD relayings Including the antenna A for being communicated with base station transceiver, for amplifying with antenna B, upstream amplifier and the downlink of terminal transmitting-receiving communication Device, the antenna A and antenna B are connected by switching A and switch B switchings with upstream amplifier or downstream amplifier, pass through uplink Amplifier and downstream amplifier carry out uplink signal and downlink signal relaying amplification, and TDD relayings are usually operated in downstream state, By receiving the arrowband slot synchronization frame from base station, or carry the downlink acknowledgement frame of arrowband slot synchronization information and lower line number According to frame, between determining at the beginning of the number of arrowband sub-slots, and each arrowband sub-slots and the end time, and in arrowband time slot Uplink state is switched in time.
- 9. tdd communication systems as claimed in claim 2, it is characterised in that：In each arrowband sub-slots, multiple terminals To base station transmission packet, each data packet is modulated using arrowband single-carrier modulated mode；The terminal is in arrowband The form that data are transmitted in time slot adds uplink synchronous sequence to add coding data sequences again for pilot signal, and wherein pilot signal is single Frequency signal, uplink synchronous sequence are a sequences with good autocorrelation performance.
- A kind of 10. time division duplex communication method of combination spread spectrum and arrowband MIMO, it is characterised in that：During downlink, base station is using expansion The frequency communication technology sends signal to terminal, and base station and terminal are received and dispatched using single antenna；During uplink, base station uses arrowband MIMO skills The signal that art receiving terminal is sent, the multiple antennas of multiple terminal composition transmitting terminals, base station is received using multiple antennas.
- 11. time division duplex communication method as claimed in claim 10, it is characterised in that：Base station sets an arrowband slot synchronization Information maximum retransmission interval, within the interval time, base station at least sends an arrowband slot synchronization information to terminal, and terminal exists After receiving the arrowband slot synchronization information that base station is sent, the number of arrowband sub-slots in arrowband time slot, and each arrowband are determined Between at the beginning of sub-slots and end time, one arrowband sub-slots of selection send uplink signal.
- 12. time division duplex communication method as claimed in claim 11, it is characterised in that：The method that terminal selects arrowband sub-slots For：Terminal is according to the base station signal power selection arrowband sub-slots received, when received signal power is high, selects sequence number big Arrowband sub-slots.
- 13. time division duplex communication method as claimed in claim 11, it is characterised in that：The maximum weight of slot synchronization information in arrowband In hair interval, base station uses one or more in following method at least to send an arrowband slot synchronization information to terminal：(1) arrowband slot synchronization information is sent in arrowband slot synchronization frame；(2) arrowband slot synchronization information is carried in downlink acknowledgement frame, i.e., in downlink acknowledgement frame, is sent outside response message, Also arrowband slot synchronization information is sent along band；(3) arrowband slot synchronization information is carried in downlink data frame, i.e., in downlink data frame, is sent outside downlink data, Also arrowband slot synchronization information is sent along band.
- 14. time division duplex communication method as claimed in claim 13, it is characterised in that：Downlink acknowledgement frame is at the same time to multiple terminals Response is carried out, that is, is merged to the reply data of multiple terminals in a downlink acknowledgement frame, base station sends the expansion of downlink acknowledgement frame Frequency multiple is set to the required spread spectrum multiple of terminal of worst signal quality.
- 15. time division duplex communication method as claimed in claim 11, it is characterised in that：Terminal searching base station operation channel uses Mode be：Terminal-pair base station listening period is more than arrowband slot synchronization information maximum retransmission interval, if having received arrowband Gap synchronizing information, then have found working channel；Otherwise, switch next possible base station operation channel to continue to monitor；If look for To multiple working channels, then selection receives the most strong working channel of base station signal power.
- 16. time division duplex communication method as claimed in claim 11, it is characterised in that：Communicate between base station and terminal and also pass through TDD is relayed, TDD relaying includes being used for the antenna A of base station transceiver communication, for the antenna B with terminal transmitting-receiving communication, Row amplifier and downstream amplifier, the antenna A and antenna B are put by switching A and switch B switchings with upstream amplifier or downlink Big device is connected, and relaying amplification is carried out to uplink signal and downlink signal by upstream amplifier and downstream amplifier, TDD relayings are flat When be operated in downstream state, by receiving arrowband slot synchronization frame from base station, or carry arrowband slot synchronization information Downlink acknowledgement frame and downlink data frame, determine the number of arrowband sub-slots, and at the beginning of each arrowband sub-slots between and tie The beam time, and it is switched to uplink state in arrowband slot time.
- 17. time division duplex communication method as claimed in claim 11, it is characterised in that：In each arrowband sub-slots, multiple ends Hold to base station transmission packet, each data packet and be modulated using arrowband single-carrier modulated mode；The terminal is in arrowband The form that data are transmitted in sub-slots adds uplink synchronous sequence to add coding data sequences again for pilot signal, and wherein pilot signal is Single frequency signal, uplink synchronous sequence are a sequences with good autocorrelation performance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711446888.1A CN107947829B (en) | 2017-12-27 | 2017-12-27 | Time division duplex communication system and method combining spread spectrum and narrowband MIMO |
| PCT/CN2018/109676 WO2019128379A1 (en) | 2017-12-27 | 2018-10-10 | Time division duplex communication system and method combining spread spectrum and narrow-band mimo |
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| CN201711446888.1A CN107947829B (en) | 2017-12-27 | 2017-12-27 | Time division duplex communication system and method combining spread spectrum and narrowband MIMO |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019128379A1 (en) * | 2017-12-27 | 2019-07-04 | 武汉拓宝科技股份有限公司 | Time division duplex communication system and method combining spread spectrum and narrow-band mimo |
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| WO2019128379A1 (en) * | 2017-12-27 | 2019-07-04 | 武汉拓宝科技股份有限公司 | Time division duplex communication system and method combining spread spectrum and narrow-band mimo |
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| CN111918394B (en) * | 2019-05-09 | 2024-05-07 | 深圳长城开发科技股份有限公司 | Method for uplink data of LoRa terminal, loRa network and storage medium |
| CN110912603A (en) * | 2019-12-18 | 2020-03-24 | 上海道生物联技术有限公司 | Wireless communication system and method based on relay |
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| CN107947829B (en) | 2023-07-25 |
| WO2019128379A1 (en) | 2019-07-04 |
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