CN110139378A - A kind of channel selecting method of more narrowband polymerization terminals - Google Patents
A kind of channel selecting method of more narrowband polymerization terminals Download PDFInfo
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- CN110139378A CN110139378A CN201910304601.4A CN201910304601A CN110139378A CN 110139378 A CN110139378 A CN 110139378A CN 201910304601 A CN201910304601 A CN 201910304601A CN 110139378 A CN110139378 A CN 110139378A
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- subchannel
- channel
- narrow
- narrowband
- selection
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
Abstract
The invention discloses a kind of channel selecting methods of more narrowband polymerization terminals, comprising the following steps: S1, each narrow channel estimate the channel quality of each frequency point subchannel according to downlink reference signal；S2 is converted to link transmission rate according to channel quality；S3 selects the highest subchannel of transmission rate；S4, the subchannel for judging that whether the subchannel of selection selects with other narrow channels repeat；S5 enters step S6, otherwise enters step S7 if the subchannel of all narrow channels selection is different from；S6, using step S3 or the select subchannel of step S7 as the communication frequency point of corresponding narrow channel, subsequently into step S8；S7 carries out the selection of joint subchannel to the narrow channel of selection same sub-channel, subsequently into step 6；S8, each narrow channel are initiated random access procedure and are carried out data transmission on the frequency point that step S6 is determined.The present invention greatly improves the message transmission rate and transmission stability of polymerization terminal.
Description
Technical field
The present invention relates to smart grid wireless communication fields, and in particular to a kind of channel selection side of more narrowband polymerization terminals
Method.
Background technique
EPON Fibre Optical Communication Technology wants communication mode to be limited by cost and region etc. as power distribution automation access host,
Fiber optic network is difficult to realize all standing of power distribution communication access net, is supplemented so needing to seek other communication modes.
In addition, with the deep propulsion of clean energy resource substitution and electric energy substitution and energy revolution, distributed photovoltaic, electricity
Explosive growth will be presented in the business such as electrical automobile charging pile, and grid sources-net-lotus-storage interactive model will change, this requirement pair
The control ability of power distribution network, sensing capability General Promotion need General Promotion low voltage electric network (380kV/220kV) operating status
Quasi real time collection ability, to promote operation of power networks horizontal and service mode qualitative leap.Electric power wireless private network is to realize power grid
One of end service access and the important technology of acquisition, it is therefore desirable to it is special to establish the electric power wireless communication based on specific authorisation frequency range
Net.
230MHz frequency range is divided as unit of 25KHz, it is therefore desirable to use narrowband Radio Transmission Technology.By band
The transmission rate of wide limitation, each narrow channel is limited, the low business of message transmission rate is only coped with, for example, electricity consumption
Information collection, detection.But there is also some broadband services in power business scene, for example, the transmission of image/video, accurate load
Control etc..Carrier wave polymerization can condense together 2~5 available member carriers, improving transmission bandwidth.But it depends on and sets
Standby processing capacity.Since cost is relatively low for single narrow-band devices, it is unfavorable for coming by using advanced technologies such as carrier wave polymerizations
Improve transmission rate.Multiple narrow band transmission chips can physically be carried out parallel connection by the thought for using for reference carrier wave polymerization, be formed more
Narrowband polymerize terminal, to realize the effect for realizing broadband services transmission using narrowband terminal, realizes the integration of wide and narrow strip business
Target.Obviously, the selection assignment problem of each narrow channel (i.e. subchannel) is the polymerization terminal problem to be solved.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of channel selecting methods of more narrowband polymerization terminals, realize
Wide and narrow strip business integration transmission greatly improves the message transmission rate of more narrowband polymerization terminals.
In order to solve the above technical problems, the present invention adopts the following technical scheme: a kind of channel choosing of more narrowband polymerization terminals
Selection method, comprising the following steps:
Step S1, each narrow channel estimate the channel quality of each frequency point subchannel according to downlink reference signal；
Step S2 is converted to link transmission rate according to channel quality；
Step S3 selects the highest subchannel of transmission rate；
Step S4, the subchannel for judging that whether the subchannel of selection selects with other narrow channels repeat；
Step S5 enters step S6, otherwise enters step if the subchannel of all narrow channels selection is different from
S7；
Step S6, using step S3 or the select subchannel of step S7 as the communication frequency point of corresponding narrow channel,
Subsequently into step S8；
Step S7 carries out the selection of joint subchannel to the narrow channel of selection same sub-channel, subsequently into step 6；
Step S8, each narrow channel initiate random access procedure on the frequency point that step S6 is determined and carry out data biography
It is defeated.
Optionally, the step S1, for equipment when being switched on or needing to carry out subchannel gravity treatment, each narrow channel is successively right
Every sub-channels carry out the reception of downlink reference signal, then estimate the channel quality of every sub-channels, wherein channel quality
Including signal-to-noise ratio.
Optionally, the step S2, according to the quantitative relation of received signal to noise ratio and message transmission rate, by each narrow bandpass
The received signal to noise ratio of every sub-channels in road is converted to message transmission rate.
Optionally, all subchannels are ranked up by the step S3 according to the size of message transmission rate, if occurring
The subchannel of two identical data transmission rates, these subchannels are ranked up according to received signal to noise ratio, record each narrowband
The corresponding best sub-channel serial number in channel.
Optionally, the step S7 compares the best sub-channel for each narrow channel being independently determined in step S3
Compared with, by best sub-channel number identical narrow channel weave into group carry out joint subchannel selection, find out overall transmission rate highest
Subchannel combinations.
Optionally, all narrow channels are according to identical period gravity treatment subchannel.
Optionally, before gravity treatment subchannel, which is communicated in the subchannel that step S6 is determined.
Optionally, random signal is sent in the unduplicated subchannel determined by step S6 or is carried out data transmission, when
When needing to carry out subchannel gravity treatment, downlink data transmission will be unable to carry out, until new subchannel determines, in gravity treatment subchannel
In the process, transmitting uplink data still can be normally carried out, and after new subchannel determines, be immediately switched in new subchannel
Transmission.
The technical solution adopted by the present invention carries out independent or united son by detecting the communication quality of each sub-channels
Channel selection, and pass through the selection result of random access procedure signals base subchannel, in this way, base station can control each narrowband
Random access procedure is initiated on select frequency point in channel.Therefore, the subchannel of more narrowband polymerization terminals can be optimized
Selection, avoids the frequency point of bad channel quality, greatly improves the message transmission rate and transmission stability of polymerization terminal.
The specific technical solution of the present invention and its advantages will in the following detailed description in conjunction with attached drawing into
Row detailed description.
Detailed description of the invention
Present invention will be further described below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is a kind of more narrowband polymerization terminal schematic diagrames；
Fig. 2 is a kind of channel selecting method flow chart of more narrowband polymerization terminals.
Specific embodiment
The technical solution of the embodiment of the present invention is explained and illustrated below with reference to the attached drawing of the embodiment of the present invention, but under
It states embodiment to be merely a preferred embodiment of the present invention, and not all.Based on the implementation example in the implementation mode, those skilled in the art
Obtained other embodiments without making creative work, belong to protection scope of the present invention.
Since internet of things equipment has access quantity big, the low feature of message transmission rate, therefore be suitble to pass using narrowband
Transferring technology.But under the scene of electric power wireless private network, the case where being coexisted there is also broadband services and narrow band service, in order to obtain compared with
Strong coverage area, it is necessary to use narrow band communication, this is resulted in can not support broadband services.But it can be using as shown in Figure 1
More narrowbands polymerization terminal multiple narrow channels are polymerize, improving transmission bandwidth.It is poly- using a kind of more narrowbands of the invention
The channel selecting method for closing terminal can optimize the subchannel selection of more narrowband polymerization terminals, avoid the frequency of bad channel quality
Point greatly improves the message transmission rate and transmission stability of polymerization terminal.
The purpose of the present invention is adopt the following technical solutions realization combined with Figure 1 and Figure 2,.
As shown in Figure 1, a kind of channel selector of more narrowbands polymerization terminal, including data flow cutting reallocation module and
Several narrow channels, data flow cutting reallocation module divides broadband services data, and selects one in several narrow channels
Sub-channels or combination carry out data transmission.
As shown in Fig. 2, a kind of channel selecting method of more narrowband polymerization terminals, comprising the following steps:
Step 1: for equipment when being switched on or needing to carry out subchannel gravity treatment, each narrowband chip (channel) is successively to every height
Channel carries out the reception of reference signal, and wherein reference signal can be cell specific reference signal, or down-going synchronous letter
Number.Then the channel quality of every sub-channels, such as snr of received signal (SNR, signal-to-noise are estimated
ratio).The estimation method of channel quality can refer to the prior art.
Step 2: the received signal to noise ratio of every sub-channels of each narrowband chip obtained in step 1 being converted into data and is passed
Defeated rate.Wherein the conversion of SNR and transmission rate can use theoretical formula (such as aromatic formula), be also possible to empirical equation
Or empirical table.As shown in table 1, the SNR value that last in table 1 arranges indicates the information that can reach each symbols carry of target
The minimum SNR requirement of bit number.
Table 1: the channel quality and transmission rate conversion table that the channel selecting method of more narrowband polymerization terminals uses
Step 3: using the information bit size of each symbols carry as foundation, each sub-channels being ranked up.Due to
The Physical Frame Structure of each narrow channel be it is identical, so the information ratio of the transmission rate of narrow channel and each symbols carry
Special number size is proportional relationship.If there is the subchannel of two identical traffic rates, then these subchannels are believed according to reception
It makes an uproar than being ranked up (signal-to-noise ratio is bigger, and subchannel quality is better).Record the corresponding best sub-channel sequence of each narrow channel
Number, best sub-channel herein refers to according to the highest subchannel of transmission rate after above-mentioned sequence.
Step 4: since all narrow channels are to be used for transmission simultaneously, so different narrow channels is needed using different
Subchannel, it is therefore desirable to whether the best sub-channel for each narrow channel that judgment step 3 obtains repeats.
Step 5: if the subchannel of all narrow channels selection is different from, entering step 6, otherwise enter step 7；
Step 6: before re-starting subchannel selection, which is communicated in the subchannel that step 6 determines.
Step 7: the best sub-channel for each narrow channel being independently determined in step 4 is compared, it will best son letter
Number identical narrow channel in road weaves into group and carries out the selection of joint subchannel, finds out the highest subchannel combinations of transmission rate.
Step 8: sending random signal in the unduplicated subchannel determined by step 6 or carry out data transmission, when need
When carrying out subchannel gravity treatment, downlink data transmission will be unable to carry out, until new subchannel determines.In the mistake of gravity treatment subchannel
Cheng Zhong, transmitting uplink data still can be normally carried out, and after new subchannel determines, are immediately switched to new subchannel and uploaded
It is defeated.Further, the period of subchannel gravity treatment is determined by terminal, can be according to the mobility of equipment, channel fading
Speed is adjusted.
Specific embodiment 1
Assuming that each optional subchannel number of narrow channel is 1~8, each narrow channel there are 3 narrow channels
Received signal to noise ratio it is as shown in table 2.
The received signal to noise ratio example (unit dB) that 2:3 narrow channel of table estimates in subchannel 1~8
With the empirical table of table 2, each sub-channels SNR of each narrow channel is converted into transmission rate, it is available
The result of table 3.
The information bit example of 3:3 narrow channel of table single symbols carry in subchannel 1~8
From table 3, can find out the highest subchannel of transmission rate, subchannel number in each narrow channel is respectively
4,2,4.It can be found that the best sub-channel of narrow channel 1 and 3 is all 4, so needing to combine the two narrow channels
Subchannel selection.Specific practice are as follows: pick out the two best sub-channels of narrow channel 1, number is 4 and 5；Narrow channel
3 two best sub-channels, number is 4 and 6.Then the selection of joint subchannel, target are carried out to the two narrow channels
To be maximum with transmission rate, i.e., to 2 kinds of possible combinations, (the selection subchannel 4 and narrow channel 3 of narrow channel 1 select sub- letter
Road 6, selection subchannel 5 and the narrow channel 3 of narrow channel 1 select subchannel 4) it is compared, select the sum of transmission rate most
Big combining form.Therefore, it can determine that the best sub-channel of narrow channel 1 is 4 by the step, narrow channel 2
Best sub-channel is 6.And the best sub-channel of narrow channel 2 is 2, and duplicate subchannel is all not present with other two channels,
Therefore, final subchannel selection result is that narrow channel 1~3 is communicated in subchannel 4,2,6 respectively.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, is familiar with
The those skilled in the art should be understood that the present invention includes but is not limited to attached drawing and interior described in specific embodiment above
Hold.Any modification without departing from function and structure principle of the invention is intended to be included in the range of claims.
Claims (8)
1. a kind of channel selecting method of more narrowband polymerization terminals, it is characterised in that the following steps are included:
Step S1, each narrow channel estimate the channel quality of each frequency point subchannel according to downlink reference signal；Step S2,
Link transmission rate is converted to according to channel quality；
Step S3 selects the highest subchannel of transmission rate；
Step S4, the subchannel for judging that whether the subchannel of selection selects with other narrow channels repeat；
Step S5 enters step S6, otherwise enters step S7 if the subchannel of all narrow channels selection is different from；
Step S6, using step S3 or the select subchannel of step S7 as the communication frequency point of corresponding narrow channel, then
Enter step S8；
Step S7 carries out the selection of joint subchannel to the narrow channel of selection same sub-channel, subsequently into step 6；Step S8,
Each narrow channel is initiated random access procedure and is carried out data transmission on the frequency point that step S6 is determined.
2. a kind of channel selecting method of more narrowband polymerization terminals according to claim 1, it is characterised in that: the step
S1, for equipment when being switched on or needing to carry out subchannel gravity treatment, each narrow channel successively carries out descending reference to every sub-channels
Then the reception of signal estimates the channel quality of every sub-channels, wherein channel quality includes signal-to-noise ratio.
3. a kind of channel selecting method of more narrowband polymerization terminals according to claim 2, it is characterised in that: the step
S2 believes the reception of every sub-channels of each narrow channel according to the quantitative relation of received signal to noise ratio and message transmission rate
It makes an uproar than being converted to message transmission rate.
4. a kind of channel selecting method of more narrowband polymerization terminals according to claim 3, it is characterised in that: the step
All subchannels are ranked up by S3 according to the size of message transmission rate, if there is the son of two identical data transmission rates
Channel, these subchannels are ranked up according to received signal to noise ratio, record the corresponding best sub-channel serial number of each narrow channel.
5. a kind of channel selecting method of more narrowband polymerization terminals according to claim 1, it is characterised in that: the step
S7 is compared the best sub-channel for each narrow channel being independently determined in step S3, best sub-channel is numbered identical
Narrow channel weave into group carry out joint subchannel selection, find out the highest subchannel combinations of overall transmission rate.
6. a kind of channel selecting method of more narrowband polymerization terminals as claimed in any of claims 1 to 5, feature
Be: all narrow channels are according to identical period gravity treatment subchannel.
7. a kind of channel selecting method of more narrowband polymerization terminals according to claim 6, it is characterised in that: in gravity treatment
Before channel, which is communicated in the subchannel that step S6 is determined.
8. a kind of channel selecting method of more narrowband polymerization terminals according to claim 7, it is characterised in that: in step S6
Random signal is sent in identified unduplicated subchannel or is carried out data transmission, when needing to carry out subchannel gravity treatment, under
The transmission of row data will be unable to carry out, until new subchannel determines that during gravity treatment subchannel, transmitting uplink data is still
It can be normally carried out, after new subchannel determines, be immediately switched to transmit in new subchannel.
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| CN201910304601.4A CN110139378B (en) | 2019-04-16 | 2019-04-16 | Channel selection method for multiple narrow-band aggregation terminals |
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| CN201910304601.4A CN110139378B (en) | 2019-04-16 | 2019-04-16 | Channel selection method for multiple narrow-band aggregation terminals |
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| CN110139378B CN110139378B (en) | 2022-07-05 |
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