CN107294670A - point-to-point communication method and system - Google Patents
point-to-point communication method and system Download PDFInfo
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- CN107294670A CN107294670A CN201610192629.XA CN201610192629A CN107294670A CN 107294670 A CN107294670 A CN 107294670A CN 201610192629 A CN201610192629 A CN 201610192629A CN 107294670 A CN107294670 A CN 107294670A
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
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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
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
-
- 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
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a kind of Point-to-point Communication Method and system, this method is communicated between including between the first end and a second end using a physical layer frame, the physical layer frame includes targeting sequencing and physical data channel, the targeting sequencing is used for the real-time tracking and channel estimation of automatic growth control, and the physical data channel is used to carry transmitting data in physical layer.
Description
Technical field
The invention mainly relates to moving communicating field, more particularly to a kind of Point-to-point Communication Method and system.
Background technology
In some new application scenarios, such as car networking and unmanned plane, use independent of network
Point-to-point communication.The scene that point-to-point communication is used can be the communication of inactive state or in shifting
The communication of dynamic state.All it is the communication of high-speed moving state as the car networking and unmanned plane of typical case's application.With
Exemplified by unmanned plane, when unmanned plane is taken photo by plane in real time, it is necessary to carry out being wirelessly transferred for big data quantity.At a high speed
Mobile and big data quantity real-time Transmission is the problem of facing new in point-to-point communication.
Unified frame structure is not formed in existing Point-to-point Communication Method.By taking unmanned plane as an example, at present most
Conventional communication mode is the communication mode based on LTE.Different according to multiplex mode, LTE frame structures have class
Type 1 and type 2.The two is described as follows：
Frame structure Class1 is that FDD (Frequency Division Multiplex) is used, and downlink data is passed in different frequencies thereon
It is defeated, using paired spectrum, full and half duplex is supported, its frame structure is as shown in Figure 1.
Under FDD, each system-frame is up to 10ms, is made up of 10 subframes (subframe).Per height
Frame length reaches 1ms, is made up of 2 continuous slot.Each slot is up to 0.5ms
(Tslot=15360Ts=0.5ms).
For FDD, downstream transmission is distinguished by frequency domain.In each 10ms,
Respectively there are 10 subframes to can be used for uplink and downlink transfer.
Frame structure type 2 is that TDD is used, and downlink data is transmitted in same frequency thereon, using it is non-into
To frequency spectrum, its frame structure is as shown in Figure 2.
For TDD (time multiplex), downstream transmission is distinguished by time domain.
Under TDD, each system-frame is up to 10ms, by 2 fields (half-frame) for being up to 5ms
Composition.Each field is made up of 5 subframes up to 1ms.Subframe in TDD include normal sub-frames and
Special subframe.
TDD supports 7 kinds of different uplink-downlink configurations (uplink-downlink configuration), correspondence
Different up-downgoing proportionings, is specifically shown in the table 4.2-2 of 3GPP agreements 36.211, such as table 1 below.Wherein " D "
One descending sub frame of correspondence, one sub-frame of uplink of " U " correspondence, one special subframe of " S " correspondence.With spy
Different subframe is corresponding, and " D " and " U " corresponding subframe is referred to as normal sub-frames by us.
TDD uplink-downlink configurations are by the TDD-Config- in RRC information>subframeAssignment
Field is set.
The uplink-downlink configuration table 4.2-2 of the 3GPP agreements 36.211 of table 1
As it can be seen from table 1 TDD uplink-downlink configurations support cutting for 5ms and 10ms downstream-to-upstream
Change the cycle.In 5ms switching cycle, all there is special subframe in 2 fields；In 10ms switching
In cycle, there is special subframe in only first field.
In the context of this application, for convenience of description, TDD 7 kinds of different up-downgoings are matched somebody with somebody
Put referred to as TDD 0~6.Such as TDD 1 represents TDD uplink-downlink configurations 1.
The subframe structure under normal sub-frame structure and FDD under TDD is identical.
Special subframe includes 3 domains：DwPTS, GP and UpPTS, the duration in this 3 domains, which is added, to be equal to
1ms.Special subframe has 9 kinds of different configurations, and the different DwPTS and UpPTS length of correspondence is shown in 3GPP
The table 4.2-1 of the 36.211 of agreement, such as table 2 below.Special subframe configuration is by RRC information
TDD-Config->SpecialSubframePatterns fields are set.
The special subframe allocation list 4.2-1 of the 3GPP agreements 36.211 of table 2
Similar with FDD, each subframe (including special subframe) under TDD is up to 1ms, by 2 companies
Continuous time slot composition, each time slot is up to 0.5ms (Tslot=15360Ts=0.5ms).
Subframe 0,5 and DwPTS are always used for downlink transfer；UpPTS and after following special subframe closely
Subframe always be used for uplink.
But existing LTE frame structures are mainly used in public network mobile communication, and point-to-point communication is special due to its
Property, LTE is used for point-to-point communication and there is following deficiency：
In LTE system, eNodeB is without the concern for power problemses, and each subframe can be transmitted.Connect
Receiving end can carry out the tracking such as AGC very well.But in point-to-point communication, may in order to save power consumption
Part subframe is without sending data, therefore automatic growth control (AGC) setting can only when receiving for receiving terminal
Usage history value, channel estimation can only use the reference symbol (RS) in data to carry out.In communication environment
When comparing severe (such as barrier is more, geographical environment complexity and high-speed mobile), exist necessarily not in performance
Foot.
The content of the invention
, can be real-time the technical problem to be solved in the present invention is to provide a kind of Point-to-point Communication Method and system
The automatic growth control setting that adjustment is received, so as to more preferably complete the decoding of physical data channel.
In order to solve the above technical problems, the invention provides a kind of Point-to-point Communication Method, this method is included in
Communicated between first end and the second end using a physical layer frame, the physical layer frame includes targeting sequencing and thing
Data channel is managed, the targeting sequencing is used for the real-time tracking and channel estimation of automatic growth control, the physics number
It is believed that road is used to carry transmitting data in physical layer.
In one embodiment of this invention, the first end and the second end are Frequency Division Multiplex systems.
In one embodiment of this invention, the first end and the second end are time division multiplexing systems, the physical layer frame
Also include be located at the targeting sequencing before protection interval, the protection interval as transmitting-receiving conversion and propagation distance,
Timing Advance adjustment time is protected.
In one embodiment of this invention, the above method also includes the length that targeting sequencing is determined according to following factor
Degree：Length can complete the tracking adjustment of automatic growth control；Length can complete the acquisition of time-frequency and frequency deviation.
In one embodiment of this invention, the above method also includes determining the protection interval according to following manner
Length：
GP_Length=max { ttransf,TAmax}+treserve
Wherein ttransfIt is device conversion time, is determined by selection device property, TAmaxIt is that Timing Advance is maximum
Value, is that the maximum propagation distance supported according to system is determined, treserveIt is allowance.
The present invention proposes a kind of Point-to-Point Communication System, including first end and the second end, the first end and second
End is configured so that a physical layer frame is communicated, and the physical layer frame includes targeting sequencing and physical data channel,
The targeting sequencing is used for the real-time tracking and channel estimation of automatic growth control, and the physical data channel is used to hold
Carry transmitting data in physical layer.
In one embodiment of this invention, the Point-to-Point Communication System is Frequency Division Multiplex system.
In one embodiment of this invention, the Point-to-Point Communication System is time division multiplexing system, the physical layer frame
Also include be located at the targeting sequencing before protection interval, the protection interval as transmitting-receiving conversion and propagation distance,
Timing Advance adjustment time is protected.
In one embodiment of this invention, the length of the targeting sequencing is determined according to following factor：Length energy
Enough complete the tracking adjustment of automatic growth control；Length can complete the acquisition of time-frequency and frequency deviation.
In one embodiment of this invention, the length of the protection interval is determined according to following manner：
GP_Length=max { ttransf,TAmax}+treserve
Wherein ttransfIt is device conversion time, is determined by selection device property, TAmaxIt is that Timing Advance is maximum
Value, is that the maximum propagation distance supported according to system is determined, treserveIt is allowance.
The present invention proposes a kind of frame method of reseptance of point-to-point communication, comprises the following steps：Receive a physical layer
The targeting sequencing of frame, the targeting sequencing is used for the real-time tracking and channel estimation of automatic growth control；Use this
Targeting sequencing adjusts the setting of automatic growth control, and inclined and frequency deviation information when obtaining in real time；According to adjustment
The setting of automatic growth control afterwards, receives the physical data channel of the physical layer frame, the physical data channel
For carrying transmitting data in physical layer；The decoding of physical data channel is carried out according to inclined and frequency deviation information when this.
Compared with prior art, the present invention has advantages below：The point-to-point communication of the above embodiment of the present invention
Method and system, contains targeting sequencing in the frame structure, receiving terminal by the reception and parsing of targeting sequencing,
Reception AGC settings, and inclined and frequency deviation information when can obtain in advance can be adjusted in real time, so that more excellent
Completion physical data channel decoding.And by flexibly setting targeting sequencing, support under different scenes
Communication requirement, particularly compared with complex scene points of high velocity point to-point communication transmission.
Brief description of the drawings
Fig. 1 is the frame structure Class1 that known LTE system is applied to FDD.
Fig. 2 is the frame structure type 2 that known LTE system is applied to TDD.
Fig. 3 is one embodiment of the invention Point-to-Point Communication System schematic diagram.
Fig. 4 is the physical layer frame structure for TDD system of one embodiment of the invention Point-to-point Communication Method
Schematic diagram.
Fig. 5 is the physical layer frame structure for FDD system of one embodiment of the invention Point-to-point Communication Method
Schematic diagram.
Fig. 6 is the frame method of reseptance flow chart of one embodiment of the invention point-to-point communication.
Embodiment
For the above objects, features and advantages of the present invention can be become apparent, below in conjunction with accompanying drawing to this hair
Bright embodiment elaborates.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still of the invention
It can also be implemented using other different from other manner described here, therefore the present invention is not by described below
Specific embodiment limitation.
Fig. 3 is one embodiment of the invention Point-to-Point Communication System schematic diagram.With reference to shown in Fig. 3, the present embodiment
Point-to-Point Communication System 300 include the end 304 of first end 302 and second, wireless point is carried out therebetween
Point to-point communication.The form at the end 304 of first end 302 and second can be changed according to different application scenarios,
Such as end 304 of first end 302 and second can be automobile, or first end 302 can be unmanned plane,
Second end 304 can be with reception device.Point-to-Point Communication System 300 can be the TDD based on LTE system
System or FDD system.
First end 302 and second mutually can send communication frame to be communicated between end 304.According to this hair
Bright embodiment, is communicated using specific frame structure at the end 304 of first end 302 and second, is divided below
Not be described with TDD and FDD situation.
Fig. 4 is the physical layer frame structure for TDD system of one embodiment of the invention Point-to-point Communication Method
Schematic diagram.With reference to shown in Fig. 4, the physical layer subframe under the TDD system of the present embodiment is special comprising 3
Region, respectively protection interval (GP), targeting sequencing (Preamble) and physical data channel (DCH).Protection
Interval is protected as transmitting-receiving conversion and propagation distance, Timing Advance adjustment time in a tdd system, can
It is adjusted with transmitting-receiving conversion time during the propagation distance supported according to system and selection etc..Targeting sequencing
Real-time tracking and channel estimation for automatic growth control (AGC).In high-speed mobile communications, by preceding
Receiving the decode for sequence is led, the signal intensity when frame signal is obtained, so as to complete AGC real-time tracking；
The reference signal carried simultaneously in targeting sequencing can be used for channel estimation.Physical data channel by it is multiple when
Identical symbol is constituted on domain to constitute, and is mainly used in carrying transmitting data in physical layer.
In the Point-to-point Communication Method of the present embodiment, protection interval can be set according to the actual requirements with before
Lead the lengthy content of sequence.
For protection interval, the length of protection interval is an important parameter, the ginseng in TDD system
The demand of several value viewing systems is determined, can be used without limiting to following method definition：
GP_Length=max { ttransf,TAmax}+treserve
Wherein：
ttransf：Device conversion time, is determined by selection device property.
TAmax：Timing Advance maximum, is that the maximum propagation distance supported according to system is determined.Value
For：2*D/c, wherein D are the maximum electromagnetic wave propagation distance of communicating pair, and c is propagation velocity of electromagnetic wave.
Due to communicating pair electromagnetic wave propagation distance and its geographic exist apart from value can in certain relation, engineering
Use geographic distance approximate substitution.
treserve：For simplicity the value of setting in allowance, engineering.
The length selection of targeting sequencing is then based on from the aspect of following two：Length can complete AGC with
Track is adjusted；Length can complete the acquisition of time-frequency and frequency deviation.
Fig. 5 is the physical layer frame structure for FDD system of one embodiment of the invention Point-to-point Communication Method
Schematic diagram.With reference to shown in Fig. 5, the physical layer subframe under FDD system includes 2 special areas, is respectively
Targeting sequencing and physical data channel.Targeting sequencing is used for AGC real-time trackings and channel estimation.At a high speed
In mobile communication, by receiving the decode for targeting sequencing, the signal intensity when frame signal is obtained, so that complete
Into AGC real-time tracking；The reference signal carried simultaneously in targeting sequencing can be used for channel estimation.
Physical layer data channel constitutes identical symbol in multiple time domains and constituted, and is mainly used in carrying physical layer data
Transmission.
In the Point-to-point Communication Method of the present embodiment, the length of targeting sequencing can be set according to the actual requirements
Content.The length selection of such as targeting sequencing can be based on from the aspect of following two：Length can be completed
AGC tracking adjustment；Length can complete the acquisition of time-frequency and frequency deviation.
Return to shown in Fig. 3, if the second end 304 is receiving terminal, then the method that its frame is received refers to Fig. 6
It is shown, comprise the following steps：
In step 601, the targeting sequencing of a physical layer frame is received, the targeting sequencing is used for automatic growth control
Real-time tracking and channel estimation；
In step 602, the setting of automatic growth control is adjusted in real time using the targeting sequencing, and when obtaining
Inclined and frequency deviation information；
In step 603, according to the setting of the automatic growth control after adjustment, the physics of the physical layer frame is received
Data channel, the physical data channel is used to carry transmitting data in physical layer；
In step 604, the decoding of physical data channel is carried out according to inclined and frequency deviation information when this.
The Point-to-point Communication Method and system of the above embodiment of the present invention, contain targeting sequencing in the frame structure,
Receiving terminal can adjust reception AGC settings in real time by the reception and parsing of targeting sequencing, and can
Inclined and frequency deviation information when obtaining in advance, so that the decoding of more excellent completion physical data channel.And pass through spirit
Setting targeting sequencing living, supports the communication requirement under different scenes, particularly compared with the high speed under complex scene
Rate point-to-point communication is transmitted.For TDD system, the point-to-point communication side of the above embodiment of the present invention
Method and system, further comprises protection interval in the frame structure, therefore, and each subframe can serve as uplink frame
Or downlink frame, it is not necessary to special subframe completes downlink frame to the conversion of uplink frame；And in larger timing
Under lead adjustment, it is not required that sacrifice the transmission of some subframe.
In each terminal inner of Point-to-Point Communication System, the Point-to-point Communication Method of the above embodiment of the present invention
Can such as combination of computer software, hardware or computer software and hardware computer-readable medium
In be carried out.For hardware implementation, embodiment described in the present invention can be one or more special
With integrated circuit (ASIC), digital signal processor (DSP), digital signal processing device (DSPD),
It is PLD (PLD), field programmable gate array (FPGA), processor, controller, micro-
The selection combination of controller, microprocessor, other electronic installations for performing above-mentioned functions or said apparatus
To be carried out.In some circumstances, this kind of embodiment can be implemented by controller.
For software implementation, Point-to-point Communication Method described in the present invention can pass through such as program module
(procedures) it is carried out with the independent software module such as function module (functions), wherein often
One module performs one or more functions described herein and operation.Software code can be by suitably compiling
Journey language calls the turn the application software write to be carried out, and can be stored in internal memory, by controller or processor
Perform.
Although the present invention is described with reference to current specific embodiment, common skill in the art
Art personnel are it should be appreciated that the embodiment of the above is intended merely to the explanation present invention, without departing from essence of the invention
Various equivalent change or replacement can be also made in the case of god, therefore, as long as in the connotation of the present invention
In the range of the change, modification of above-described embodiment will all be fallen in the range of following claims.
Claims (11)
1. a kind of Point-to-point Communication Method, this method uses a physical layer frame between including between the first end and a second end
Communicated, the physical layer frame includes targeting sequencing and physical data channel, the targeting sequencing is used for automatic gain control
The real-time tracking and channel estimation of system, the physical data channel are used to carry transmitting data in physical layer.
2. Point-to-point Communication Method according to claim 1, it is characterised in that the first end and the second end
It is Frequency Division Multiplex system.
3. Point-to-point Communication Method according to claim 1, it is characterised in that the first end and the second end
It is time division multiplexing system, the physical layer frame also includes being located at the protection interval before the targeting sequencing, the protection interval
Protected as transmitting-receiving conversion and propagation distance, Timing Advance adjustment time.
4. Point-to-point Communication Method according to claim 1, it is characterised in that also including according to it is following because
Element determines the length of the targeting sequencing：Length can complete the tracking adjustment of automatic growth control；Length can be complete
Into the acquisition of time-frequency and frequency deviation.
5. Point-to-point Communication Method according to claim 3, it is characterised in that also including according to such as lower section
Formula determines the length of the protection interval：
GP_Length=max { ttransf,TAmax}+treserve
Wherein ttransfIt is device conversion time, is determined by selection device property, TAmaxIt is that Timing Advance is maximum
Value, is that the maximum propagation distance supported according to system is determined, treserveIt is allowance.
6. a kind of Point-to-Point Communication System, including first end and the second end, the first end and the second end are configured to make
Communicated with a physical layer frame, the physical layer frame includes targeting sequencing and physical data channel, the targeting sequencing is used
In the real-time tracking and channel estimation of automatic growth control, the physical data channel is used to carry physical layer data biography
It is defeated.
7. Point-to-Point Communication System according to claim 6, it is characterised in that the Point-to-Point Communication System
It is Frequency Division Multiplex system.
8. Point-to-Point Communication System according to claim 6, it is characterised in that the Point-to-Point Communication System
It is time division multiplexing system, the physical layer frame also includes being located at the protection interval before the targeting sequencing, the protection interval
Protected as transmitting-receiving conversion and propagation distance, Timing Advance adjustment time.
9. Point-to-Point Communication System according to claim 6, it is characterised in that the length of the targeting sequencing
It is to be determined according to following factor：Length can complete the tracking adjustment of automatic growth control；Length can be completed
The acquisition of time-frequency and frequency deviation.
10. Point-to-Point Communication System according to claim 8, it is characterised in that the length of the protection interval
It is to be determined according to following manner：
GP_Length=max { ttransf,TAmax}+treserve
Wherein ttransfIt is device conversion time, is determined by selection device property, TAmaxIt is that Timing Advance is maximum
Value, is that the maximum propagation distance supported according to system is determined, treserveIt is allowance.
11. a kind of frame method of reseptance of point-to-point communication, comprises the following steps：
The targeting sequencing of a physical layer frame is received, the targeting sequencing is used for the real-time tracking and letter of automatic growth control
Estimate in road；
Adjust the setting of automatic growth control, and inclined and frequency deviation information when obtaining in real time using the targeting sequencing；
According to the setting of the automatic growth control after adjustment, the physical data channel of the physical layer frame is received, the thing
Reason data channel is used to carry transmitting data in physical layer；
The decoding of physical data channel is carried out according to inclined and frequency deviation information when this.
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| CN201610192629.XA CN107294670A (en) | 2016-03-30 | 2016-03-30 | point-to-point communication method and system |
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