CN107135470A - A kind of frame structure and its communication means of wireless self-networking physical layer - Google Patents
A kind of frame structure and its communication means of wireless self-networking physical layer Download PDFInfo
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- CN107135470A CN107135470A CN201710328451.1A CN201710328451A CN107135470A CN 107135470 A CN107135470 A CN 107135470A CN 201710328451 A CN201710328451 A CN 201710328451A CN 107135470 A CN107135470 A CN 107135470A
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- synchronous code
- frame structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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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
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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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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of frame structure and its communication means of wireless self-networking physical layer, the frame structure includes several radio frames, it is characterised in that half of radio frames of the radio frames include 1 synchronous code and 4 service subframes；And the synchronous code be placed in 4 service subframes before be used for distinguish follow-up business；The communication means includes:The business of the selection of mode of operation, the business transmission process of endpoint device and endpoint device receives process.This programme distinguishes the type of follow-up business using synchronous code, not only shortens time delay, also improves the sensitivity of detection.And different MANET cell ranges can adapt to using variable middle protection interval.
Description
Technical field
Present invention is mainly applied to the wireless self-networking communications field, more particularly to a kind of frame knot of wireless self-networking physical layer
Structure and its communication means.
Background technology
Wireless self-networking is also known as " Ad Hoc networks ", is the one of one group of mobile terminal composition with wireless transmitter
The provisional autonomous system of individual multi-hop.In MANET, each user terminal can not only be moved, moreover, having router and master concurrently
Two kinds of functions of machine.On the one hand, as main frame, terminal needs the various user oriented application programs of operation；On the other hand, as road
By device, terminal is needed to run corresponding Routing Protocol, and packets forwarding and the route of data are completed according to routing policy and routing table
Maintenance work.
The current largest wireless networking of most successful is exactly beehive net, the forth generation frame knot that the networking mode is used
Structure, it supports that type of service is more, and its protocol anomaly is complicated, and the process for setting up business is also complex, is characterized in building in business
Vertical part will carry out the foundation of Radio Link, therefore, and its time delay is also larger.
In addition, in cellular network system, clearly, such as base station is exactly main equipment for the differentiation of master-slave equipment, and one
As mobile terminal be exactly slave unit, base station is usually static, so its power consumption, instrument size are not typically main to consider
Composition, therefore, no matter base station can whether there is data transfer in all descending sub frames, will carry out cell reference signals
Propagate, in order in this cell mobile terminal keep Radio Link, and adjacent area mobile terminal nearby region measurement so that
Wireless terminal be moved into order to may；And the up-downgoing of subframe is fixed.These features are apparently not that MANET is desired.
The content of the invention
The purpose of the present invention is：In order to adapt to special application scenario, power consumption and propagation delay are reduced, is proposed a kind of wireless
The frame structure and its communication means of MANET physical layer, are carried out from group with adapting to the mobile terminal in the range of fast frequency hopping or super large
Net.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of frame structure of wireless self-networking physical layer, the frame structure includes several radio frames, wherein half wireless
Frame includes 1 synchronous code and 4 service subframes；And the synchronous code be placed in 4 service subframes before be used to distinguish follow-up
Business；The synchronous code includes descending synchronous code, protection interval and uplink synchronous code；Wherein, the descending synchronous code is used to reflect
Penetrate downlink synchronous sequence；The protection interval is used to split the frequency stability time demand that up-downgoing and frequency hopping are brought；
The uplink synchronous code is used in the synchronizing sequence sent when mapping uplink Stochastic accessing is initial and follow-up 4 service subframes
Type of service is indicated.
Further, the transmission power of the descending synchronous code can do the reference power as other service subframe downlinks
Value, and the basis of the gain control for the end points downlink reception in slave unit mode of operation.
Further, the timing of the descending synchronous code provides timing adjustment as the timing of descending benchmark for other end points.
Further, the frequency based on the frequency that the descending synchronous code is sent, line frequency school is entered for other end points
It is accurate.
Further, the big I of the protection interval is adjusted according to the cell range of MANET.
A kind of communication means of wireless self-networking, comprises the following steps：
S1：After endpoint device start, detect whether the power of the descending synchronous code received exceedes threshold value, if so, then
Slave unit mode of operation is selected, and the descending synchronous code sent according to existing end points is timed, gain and the adjustment of frequency deviation；It is no
Main equipment mode of operation is then selected, and periodically sends descending synchronous code；
S2：Endpoint device is either in slave unit mode of operation or main equipment mode of operation, when it sends business datum,
A service subframe and the uplink synchronous code corresponding with the service subframe are selected, and sends up at the time of uplink synchronous code
Synchronous code, business datum is sent in the selected service subframe；
S3：When endpoint device is sent in no business, in reception state, descending synchronous code, adjustment timing, frequency are received
Inclined and reception gain；
S4：When endpoint device detects effective uplink synchronous code, according to the relative of uplink synchronous code and descending synchronous code
Timing difference and difference power adjust the timing and gain of service subframe, and receive service subframe.
The beneficial effects of the invention are as follows：This programme distinguishes the type of follow-up business using synchronous code, when not only shortening
Prolong, also improve the sensitivity of detection.And different MANET cell ranges can adapt to using variable middle protection interval.
Brief description of the drawings
Fig. 1 is frame structure schematic diagram in the present invention.
Fig. 2 is the mode of operation selection FB(flow block) of communication means in the present invention.
Fig. 3 is the endpoint device business transmission flow block diagram of communication means in the present invention.
Fig. 4 is that the endpoint device business of communication means in the present invention receives FB(flow block).
Embodiment
Below in conjunction with accompanying drawing.The present invention will be further described.
The frame structure of the present invention is as shown in figure 1, frame structure includes several radio frames, and the cycle of a radio frames is Ts=
1/ (30.72*10^6) second；Include 1 synchronous code and 4 service subframes in wherein half radio frames；And synchronous code is placed in 4 industry
It is used to distinguish follow-up business before business subframe.
Wherein, synchronous code includes descending synchronous code, protection interval and uplink synchronous code；Descending synchronous code mainly maps descending
Synchronizing sequence, after synchronization, its power can as other service subframe downlinks reference power value, and in slave unit work
The basis of the gain control of the downlink reception of the end points of operation mode；Its timing will be other end points as the timing of descending benchmark
Timing adjustment is provided；Its frequency sent carries out frequency calibration as the frequency on basis for other end points.Protection interval is main
For separating the frequency stability time demand that up-downgoing and frequency hopping are brought.Uplink synchronous code connects at random for mapping uplink
The synchronizing sequence and the type of service of follow-up 4 sub- frame ins sent when entering initial is indicated.
Because the type of service of MANET is relatively simple, it therefore, it can distinguish follow-up business with synchronous code, on the one hand contract
Short time delay, on the other hand also improves the sensitivity of detection.
The code word of uplink synchronous code and type of service corresponding relation such as table 1 below：
Table 1
Following table is that a radius of society is 100 kilometers, the frame structure specific design scheme of 1 second 200 times frequency hoppings：
Table 2
Note：The effective time length of uplink synchronous code is 4096Ts in table 2, and remaining 512Ts is protection interval.
If the radius of MANET is 100 kilometers, and the timing based on mobile terminal A timing, then will
Other mobile terminals (it is assumed that B) self-propelled synchronous is sought to basic mobile terminal A frame structure.That is mobile terminal A
When the descending synchronous code of transmission reaches mobile terminal B, it can not be overlapped in time with the mobile terminal B uplink synchronous codes sent
Together, interference will otherwise be caused.Due to synchronous with mobile terminal A frame structure, therefore, mobile terminal B needs base in advance
Sent in the uplink synchronous code time of frame structure, the time in advance is 100 kilometers/3*10^5 kilometer per seconds, and descending synchronous code
Propagation delay is also 100 kilometers/3*10^5 kilometer per seconds, and it is 20480Ts to be so converted to the time scale in units of Ts.
Generally, radio-frequency devices change frequency work, and the stable time is 50 microseconds in new frequency, be converted into
Ts is that time scale is 1536Ts.
Under normal temperature, in the case of with a width of 10 megahertzs, the power of thermal noise is -104dbm, if synchronizing sequence
Transmit power is 23dbm, and the loss that 100 kilometers of signal line-of-sight transmission is 118dB, then reach the power of receiving terminal synchronizing sequence
For -95dbm, signal to noise ratio now is 9dB, and the length of the downlink synchronous sequence of design is 128, and it has 21dB related gain,
In a word, the signal to noise ratio of the synchronizing sequence of receiving terminal is 30dB, is far longer than the 0dB threshold requirements that can be detected, therefore, this is superfluous
It is remaining to can be used for decline and interference common in confrontation radio communication.
It is longer that uplink synchronous code is designed, therefore, and it detects that performance can be more preferable, up for descending synchronous code
Synchronization code sequence is it is also possible to multiple be superimposed, such as when multiple end points send uplink synchronous on same running time-frequency resource
Code.
The change of working frequency points is completed on frequency hopping, that is, radio-frequency devices, descending synchronous code is the nothing in order to newly access
Line endpoints initial synchronisation, therefore, its working frequency points are constant always, and follow-up uplink synchronous code and business time-slot, then can root
Enter the conversion of line frequency according to certain rule, so as to reach the effects such as anti-interference, secrecy.
It is a kind of communication means of wireless self-networking based on above-mentioned frame structure below, comprises the following steps：
S1：As shown in Fig. 2 the step is the selection course of mode of operation, specifically include：After endpoint device start, detection
Whether the power of the descending synchronous code received exceedes threshold value, if so, slave unit mode of operation is then selected, and according to having held
The descending synchronous code that point is sent is timed, gain and the adjustment of frequency deviation；Otherwise selection main equipment mode of operation (is similar to honeycomb
In base station), and periodically send descending synchronous code；
S2：As shown in figure 3, the step is the business transmission process of endpoint device, specifically include：Endpoint device is either located
In slave unit mode of operation or main equipment mode of operation, when it sends business datum, one service subframe of selection and with the business
The corresponding uplink synchronous code of subframe, and uplink synchronous code is sent at the time of uplink synchronous code, in the selected service subframe
Upper transmission business datum；
S3 and S4 is as shown in figure 4, two step receives process for the business of endpoint device, specifically as shown in figure 4, when end points is set
For when no business is sent, in reception state, descending synchronous code, adjustment timing, frequency deviation and reception gain are received；Work as end points
When equipment detects effective uplink synchronous code, adjusted according to the relative timing of uplink synchronous code and descending synchronous code difference and difference power
The timing and gain of whole service subframe, and receive service subframe.
The general principle and principal character of this programme and the advantage of this programme has been shown and described above.The technology of the industry
Personnel are it should be appreciated that this programme is not restricted to the described embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of scheme, on the premise of this programme spirit and scope are not departed from, this programme also has various changes and modifications, these changes
Change and improve and both fall within the range of claimed this programme.This programme be claimed scope by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of frame structure of wireless self-networking physical layer, the frame structure includes several radio frames, it is characterised in that described
Half of radio frames of radio frames include 1 synchronous code and 4 service subframes；And the synchronous code is placed in 4 service subframes
It is used to distinguish follow-up business before；The synchronous code includes descending synchronous code, protection interval and uplink synchronous code；Wherein, it is described
Descending synchronous code is used to map downlink synchronous sequence；The protection interval is used to split the frequency that up-downgoing and frequency hopping are brought
Stability time demand；The uplink synchronous code is used for the synchronizing sequence sent when mapping uplink Stochastic accessing is initial and follow-up
Type of service in 4 service subframes is indicated.
2. a kind of frame structure of wireless self-networking physical layer as claimed in claim 1, it is characterised in that the descending synchronous code
Transmission power can do the reference power value as other service subframe downlinks, and be the end in slave unit mode of operation
The basis of the gain control of point downlink reception.
3. a kind of frame structure of wireless self-networking physical layer as claimed in claim 1, it is characterised in that the descending synchronous code
Timing as descending benchmark timing, provide timing adjustment for other end points.
4. a kind of frame structure of wireless self-networking physical layer as claimed in claim 1, it is characterised in that the descending synchronous code
Frequency based on the frequency of transmission, frequency calibration is carried out for other end points.
5. a kind of frame structure of wireless self-networking physical layer as claimed in claim 1, it is characterised in that the protection interval
Big I is adjusted according to the cell range of MANET.
6. a kind of communication means of the wireless self-networking based on frame structure described in claim 1, comprises the following steps：
S1：After endpoint device start, detect whether the power of the descending synchronous code received exceedes threshold value, if so, then selecting
Slave unit mode of operation, and the descending synchronous code sent according to existing end points is timed, gain and the adjustment of frequency deviation；Otherwise select
Main equipment mode of operation is selected, and periodically sends descending synchronous code；
S2：Endpoint device is either in slave unit mode of operation or main equipment mode of operation, when it sends business datum, selection
One service subframe and the uplink synchronous code corresponding with the service subframe, and send uplink synchronous at the time of uplink synchronous code
Code, business datum is sent in the selected service subframe；
S3：When endpoint device is sent in no business, in reception state, receive descending synchronous code, adjustment timing, frequency deviation and
Reception gain；
S4：When endpoint device detects effective uplink synchronous code, according to the relative timing of uplink synchronous code and descending synchronous code
Difference and difference power adjust the timing and gain of service subframe, and receive service subframe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109451583A (en) * | 2018-11-19 | 2019-03-08 | 希诺麦田技术（深圳）有限公司 | Ad hoc network method, device, nodal terminal and storage medium based on superframe |
| CN117792855A (en) * | 2024-02-26 | 2024-03-29 | 山东浪潮数据库技术有限公司 | Method and device for realizing frame structure of wireless ad hoc network system |
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| CN105099542A (en) * | 2014-05-12 | 2015-11-25 | 魏峥 | MANET (Mobile Ad Hoc Network) frame generating method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109451583A (en) * | 2018-11-19 | 2019-03-08 | 希诺麦田技术（深圳）有限公司 | Ad hoc network method, device, nodal terminal and storage medium based on superframe |
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| CN117792855A (en) * | 2024-02-26 | 2024-03-29 | 山东浪潮数据库技术有限公司 | Method and device for realizing frame structure of wireless ad hoc network system |
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Application publication date: 20170905 |