CN108696296A - The method and point of termination station of Frequency Band Selection - Google Patents

The method and point of termination station of Frequency Band Selection Download PDF

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Publication number
CN108696296A
CN108696296A CN201710228649.2A CN201710228649A CN108696296A CN 108696296 A CN108696296 A CN 108696296A CN 201710228649 A CN201710228649 A CN 201710228649A CN 108696296 A CN108696296 A CN 108696296A
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China
Prior art keywords
preamble sequence
prestores
frequency range
point
sequence
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Granted
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CN201710228649.2A
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Chinese (zh)
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CN108696296B (en
Inventor
吕宜宣
徐德超
张国宾
郭佳
田甲申
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201710228649.2A priority Critical patent/CN108696296B/en
Priority to CN202011086071.XA priority patent/CN112332888B/en
Publication of CN108696296A publication Critical patent/CN108696296A/en
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Publication of CN108696296B publication Critical patent/CN108696296B/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • 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
    • 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
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Abstract

This application provides a kind of method of Frequency Band Selection and point of termination station, this method includes:The First ray that first terminal website is sent is obtained, First ray includes the first preamble sequence, and the first preamble sequence is the corresponding preamble sequence of frequency range that current time sends signal in PLC network;First preamble sequence and each of the preamble sequence set that prestores preamble sequence that prestores are matched, determine target preamble sequence, the preamble sequence that prestores is the corresponding preamble sequence of frequency range that PLC network is supported, target preamble sequence is the preamble sequence that prestores for needing selection;It is determined as the corresponding frequency range of target preamble sequence to need the frequency range of selection.The preamble sequence that second terminal website is sent by obtaining first terminal website in embodiments of the present invention, determine the frequency range for needing selection, inter-frequency networking may be implemented, improve the efficiency of Frequency Band Selection and switching between point of termination station in PLC network, reduce the time of point of termination station networking.

Description

The method and point of termination station of Frequency Band Selection
Technical field
This application involves the communications fields, and more particularly, to the method and point of termination station of a kind of Frequency Band Selection.
Background technology
In power line communication (Power Line Communication, PLC) network, electric power can be passed through between each network Line is communicated, and realizes the mutually coordinated of heterogeneous networks, it is ensured that each network independent operating does not conflict with the generation of other networks. Since power line network environment is complicated, between concentrator and each point of termination station, there are not timings to be turned on and off the feelings such as load Condition, these are loaded, and introduced impedance, the decaying of signal and interference etc. are different, cause part point of termination station in network it Between can not normally be communicated, however due in existing powerline network, mostly using the form of single frequency band networking, When part point of termination station occurs communicating unsmooth situation in a network, need to switch over the frequency range of whole network, and cutting The frequency range for selecting to be suitble to all point of termination station in the network is needed when changing, it is longer so as to cause frequency range switching time, it is less efficient.
Invention content
The application provides a kind of method and point of termination station of Frequency Band Selection, can realize the inter-frequency networking of PLC network, improves In PLC network between point of termination station Frequency Band Selection and switching efficiency, reduce the time of point of termination station networking.
On the one hand, a kind of method of Frequency Band Selection is provided, including obtains the First ray that first terminal website is sent, institute It includes the first preamble sequence to state First ray, and first preamble sequence is current time in power line communication PLC network Send the corresponding preamble sequence of frequency range of signal;By first preamble sequence with it is every in the preamble sequence set that prestores A preamble sequence that prestores is matched, and determines target preamble sequence, the preamble sequence that prestores is what PLC network was supported The corresponding preamble sequence of frequency range, the target preamble sequence are the preamble sequence that prestores for needing selection;It will be described The corresponding frequency range of target preamble sequence is determined as needing the frequency range of selection.
In embodiments of the present invention, what second terminal station for acquiring first terminal website was sent includes the first preamble sequence First ray, first preamble sequence be current time PLC network in send signal the corresponding preamble sequence of frequency range, Second terminal website matches first preamble sequence preamble sequence corresponding with the frequency range that the PLC network is supported, It determines target preamble sequence, which is determined as the frequency range to be selected, needs selection Frequency range and the other-end website in the PLC network between frequency range currently in use may be different, it is thereby achieved that alien frequencies Networking, and when frequency range between changes terminal website, the frequency range that need not be supported one by one PLC network be detected, and be improved In PLC network between point of termination station Frequency Band Selection and switching efficiency, reduce the time of point of termination station networking.
With reference to first aspect, in the first realization method of first aspect, it is described by first preamble sequence with Each of the preamble sequence set that prestores prestores before preamble sequence matched, and the method further includes:According to described The quantity for the frequency range that PLC network is supported, determines different cyclic shift length;It is right according to the different cyclic shift length First phase for prestoring preamble sequence carries out different cyclic shifts, is removed in the preamble sequence set that prestores described in determination described First other preamble sequences that prestore to prestore except preamble sequence, described first prestores before preamble sequence is described prestore Pre-stored preamble sequence in code-guiding sequence set.
In embodiments of the present invention, the phase of different preamble sequences is obtained by cyclic shift, to obtain different frequencies The corresponding preamble sequence of section can make point of termination station not have to store multiple preamble sequences, to save point of termination station Memory space, save signaling overheads, helped avoid the wasting of resources.
With reference to first aspect, the first realization method of first aspect, in second of realization method of first aspect, institute It states and matches first preamble sequence and each of the preamble sequence set that prestores preamble sequence that prestores, determine Target preamble sequence, including:First preamble sequence and described each of the preamble sequence set that prestores are prestored Preamble sequence carries out related operation, determines peak-to-average force ratio;According to the peak-to-average force ratio, the institute in the preamble sequence that prestores described in determination State target preamble sequence.
With reference to first aspect, the first of first aspect and second of realization method, in the third realization of first aspect It is described according to the peak-to-average force ratio in mode, determine described in the target preamble sequence that prestores in preamble sequence, including:Institute When stating peak-to-average force ratio more than the first predetermined threshold value, the peak-to-average force ratio is more than the lead code sequence that prestores described in first predetermined threshold value Row are determined as target preamble sequence.
With reference to first aspect, the first of first aspect is to the third realization method, in the 4th kind of realization of first aspect In mode, when the peak-to-average force ratio is more than one more than the preamble sequence that prestores described in first predetermined threshold value, institute is determined State peak-to-average force ratio it is maximum more than peak-to-average force ratio in the preamble sequence that prestores of first predetermined threshold value it is described prestore it is leading Code sequence is the target preamble sequence.
With reference to first aspect, the first of first aspect is to the 4th kind of realization method, in the 5th kind of realization of first aspect It is described according to the peak-to-average force ratio in mode, determine described in the target preamble sequence that prestores in preamble sequence, including:It determines The maximum peak-to-average force ratio of ratio in the peak-to-average force ratio;The maximum peak-to-average force ratio of ratio in the peak-to-average force ratio is corresponding described The preamble sequence that prestores is determined as the target preamble sequence.
With reference to first aspect, the first of first aspect is to the 5th kind of realization method, in the 6th kind of realization of first aspect In mode, it is described by first preamble sequence and prestore preamble sequence set each of prestore preamble sequence progress Before matching, the method further includes:It determines with whether the communication success rate of the first terminal website is less than the second default threshold Value;The communication success rate be less than second predetermined threshold value when, by first preamble sequence with it is described prestore it is leading Each of the sequence sets conjunction preamble sequence that prestores is matched.
With reference to first aspect, the first of first aspect is to the 6th kind of realization method, in the 7th kind of realization of first aspect In mode, it is described by first preamble sequence and prestore preamble sequence set each of prestore preamble sequence progress Before matching, the method further includes:Determine the frame head of first preamble sequence in the First ray.
Second aspect provides a kind of method of Frequency Band Selection, including:Determine initial reference phase, the initial reference phase Position is the phase of the corresponding subcarrier of any one frequency range in the frequency range that power line communication PLC network is supported;According to described first Beginning fixed phase, generates the first preamble sequence, and the first preamble sequence is current time transmission signal in the PLC network The corresponding preamble sequence of frequency range;First ray is sent to second terminal website, the First ray includes described first leading Code sequence.
In embodiments of the present invention, point of termination station obtains the phase of different preamble sequences by cyclic shift, to To corresponding first preamble sequence of different frequency range, point of termination station can be made not have to store multiple first preamble sequences, from And the memory space of point of termination station is saved, signaling overheads is saved, the wasting of resources has been helped avoid.
It is described according to the initial reference phase in the first realization method of second aspect in conjunction with second aspect, it is raw At the first preamble sequence, including:According to the initial reference phase, the first fixed phase, first fixed phase are determined The phase of the corresponding subcarrier of frequency range of signal is sent for current time in the PLC network;According to first fixed phase, Generate first preamble sequence.
In conjunction with second aspect, the first realization method of second aspect, in second of realization method of second aspect, institute It states according to the initial reference phase, determines the first fixed phase, including:Letter is sent according to current time in the PLC network Number frequency range frequency range corresponding with the initial reference phase between number of frequency bands, determine the length of cyclic shift;According to institute The length for stating cyclic shift carries out cyclic shift to the initial reference phase, determines first fixed phase.
The third aspect provides a kind of point of termination station, includes one or more moulds for executing the method in first aspect Block.
Fourth aspect provides a kind of point of termination station, includes one or more moulds for executing the method in second aspect Block.
5th aspect, provides a kind of point of termination station, includes one or more moulds for executing the method in first aspect Block.
6th aspect, provides a kind of point of termination station, includes one or more moulds for executing the method in second aspect Block.
7th aspect, provides a kind of computer-readable medium, and the computer-readable medium can be by second eventually for storing The program code that end station point executes, said program code includes each reality for executing above-mentioned first aspect and the first aspect The instruction of method in existing mode.
Eighth aspect, provides a kind of computer-readable medium, and the computer-readable medium can be by first eventually for storing The program code that end station point executes, said program code includes each reality for executing above-mentioned second aspect and the second aspect The instruction of method in existing mode.
Description of the drawings
Fig. 1 is the schematic diagram that PLC network according to the ... of the embodiment of the present invention carries out frequency range switching.
Fig. 2 is that the point of termination station newly to network in PLC network according to the ... of the embodiment of the present invention carries out the schematic diagram of Frequency Band Selection.
Fig. 3 is the schematic flow chart of the method for Frequency Band Selection according to the ... of the embodiment of the present invention.
Fig. 4 is another schematic flow chart of the method for Frequency Band Selection according to the ... of the embodiment of the present invention.
Fig. 5 is the another schematic flow chart of the method for Frequency Band Selection according to the ... of the embodiment of the present invention.
Fig. 6 is the schematic frame diagram of point of termination station according to the ... of the embodiment of the present invention.
Fig. 7 is another schematic frame diagram of point of termination station according to the ... of the embodiment of the present invention.
Fig. 8 is another schematic frame diagram of point of termination station according to the ... of the embodiment of the present invention.
Fig. 9 is the another schematic frame diagram of point of termination station according to the ... of the embodiment of the present invention.
Specific implementation mode
Below in conjunction with attached drawing, the technical solution in the application is described.
Currently, in the field power line communication (Power Line Communication, PLC), the power line communication network Network all uses the form of single frequency band networking to be frequently encountered such as institute in Fig. 1 and Fig. 2 when using single frequency band networking substantially The problem of stating.
Fig. 1 show the schematic diagram that PLC network carries out frequency range switching, as shown in Figure 1, in the PLC network operational process, At a time, due to the interference of other interference signals such as signal fadeout or noise, cause to use between point of termination station C and F Frequency range f1It is unavailable, it cannot so as to cause point of termination station F and central coordinator (Central Coordinator, CCO) A websites Normally communicated, it is therefore desirable to the frequency range used between switching site C and website F, however, due in existing PLC network Using the mode of single networking, it is unaware which frequency range is the frequency range of point of termination station C and point of termination station F need replacing as, leads to In the case of often, the frequency range between all point of termination station in the PLC network is needed to replace.Carrying out all point of termination station Between frequency range replace when, the frequency range for finding suitable all point of termination station is needed, for example, by currently used in the PLC network Frequency range f1It is changed to f3When, at this point, can normally be communicated between point of termination station C and point of termination station F, but may make It cannot normally be communicated between point of termination station A and point of termination station B, need to switch frequency range again, until finding suitable institute The frequency range for having website, since the number of frequency bands that PLC network is supported is limited, this network environment, it is possible to occur in PLC network The case where without available frequency range, seriously affects the stability of PLC network transmission information.
Fig. 2 show the schematic diagram that the point of termination station newly to network in PLC network carries out Frequency Band Selection, as shown in Fig. 2, due to The point of termination station N newly to network does not know frequency range used in the point of termination station current time of upstream, and point of termination station N needs should All frequency ranges that PLC network is supported carry out investigation one by one, until the frequency range that upstream stations use is found, however in PLC nets When the number of frequency bands that network is supported is more, at this point, the network entry time of the point of termination station newly to network is relatively long.
Conventionally, as PLC network uses the mode of single frequency band networking more, in the frequency range of individual terminal website Can not in use, whole network cannot use the frequency range, need the frequency range to all point of termination station to replace, however, by It is limited in the number of frequency bands that PLC network is supported, there are problems that the frequency range of suitable all point of termination station can not be found, to serious Influence the transmission of signal.
Based on Fig. 1 and the prior art shown in Fig. 2 and problems of the prior art, the embodiment of the present invention proposes one The method of kind Frequency Band Selection, certain two point of termination station occurs to communicate unsmooth or has new point of termination station to need to add in PLC network When entering the PLC network, the upstream end website in two unsmooth point of termination station of communication occurs or the end of the PLC network is newly added The upstream end website of end station point downstream can send preamble sequence by point of termination station, and downstream endpoint website will be by that will receive Preamble sequence preamble sequence corresponding with the frequency range that PLC network is supported is matched, and determines to send out with upstream end website The matched preamble sequence of preamble sequence sent, to what is selected or switch according to matched preamble sequence determination needs Frequency range, the frequency range of the selection may be different from the corresponding frequency range of preamble sequence that upstream end website is sent, but still can be with Ensure the normal communication between point of termination station in PLC network, it is thereby achieved that the inter-frequency networking of PLC network, and improve The rate of selection and the switching of frequency range in PLC network between point of termination station reduces the time of point of termination station networking.
Fig. 3 is the schematic flow chart of the method 300 of Frequency Band Selection according to the ... of the embodiment of the present invention, and this method 200 can be with It is executed by any one point of termination station in PLC network, for example, it may be the downstream of two unsmooth point of termination station of communication occurs Point of termination station, or the point of termination station that newly networks.As shown in figure 3, this method 300 includes:
310, the First ray that first terminal website is sent is obtained, the First ray includes the first preamble sequence, institute It is the corresponding preamble sequence of frequency range that current time sends signal in power line communication PLC network to state the first preamble sequence;
320, by first preamble sequence and prestore each of preamble sequence set prestore preamble sequence into Row matching determines that target preamble sequence, the preamble sequence that prestores are the corresponding lead code sequence of frequency range that PLC network is supported Row, the target preamble sequence are the preamble sequence that prestores for needing selection;
330, it is determined as the corresponding frequency range of the target preamble sequence to need the frequency range of selection.
It should be understood that will can occur to communicate in PLC network the upstream end website in unsmooth two point of termination station as First terminal website, downstream endpoint website is as second terminal website, the i.e. executive agent of this method 300, for example, shown in Fig. 1 Point of termination station C and point of termination station F be unable to normal communication, at this point it is possible to using point of termination station C as first terminal website, terminal Website F is as second terminal website;Or can also be using the point of termination station newly to network as second terminal website, end for newly networking The point of termination station of the upstream of end station point is as first terminal website, for example, point of termination station N shown in Fig. 2 is the terminal newly to network Website, at this point it is possible to using point of termination station G as first terminal website, point of termination station N is as second terminal website, this method 300 Using second terminal website as executive agent.
In embodiments of the present invention, what second terminal station for acquiring first terminal website was sent includes the first preamble sequence First ray, first preamble sequence be current time PLC network in send signal the corresponding preamble sequence of frequency range, Second terminal website matches first preamble sequence preamble sequence corresponding with the frequency range that the PLC network is supported, It determines target preamble sequence, which is determined as the frequency range to be selected, needs selection Frequency range and the other-end website in the PLC network between frequency range currently in use may be different, it is thereby achieved that alien frequencies Networking, and when frequency range between changes terminal website, the frequency range that need not be supported one by one PLC network be detected, and be improved In PLC network between point of termination station Frequency Band Selection and switching efficiency, reduce the time of point of termination station networking.
It should be understood that it is unsmooth when needing the frequency range used between switching terminal website to occur communication between point of termination station, this When, the frequency range that the frequency range of switching is used with other-end website can be the same or different, due between two point of termination station Have occurred communication it is unsmooth, former frequency range can not be further continued for using between two point of termination station, determine switching frequency range when, It only needs to carry out selection switching in other frequency ranges in addition to former frequency range supported from PLC network, as long as before other frequency ranges Code-guiding sequence corresponding with other-end website frequency range currently in use in PLC network preamble sequence matching, it is determined that its He can combine frequency range with the other-end website current time frequency range currently in use in the PLC network, ensure Normal communication between each point of termination station, it is thereby achieved that the function of inter-frequency networking, alternatively, occurring in two point of termination station Communicate it is unsmooth after the very short time in, former frequency range can make again again the communication between two point of termination station keep just Often, at this point, if having had begun frequency range switching, the frequency range switched can will be needed to be determined as former frequency range;In point of termination station When new networking, it can be frequency range identical with the frequency range that upstream stations current time uses to need the frequency range of selection at this time, also may be used It, can as long as the frequency range of the selection is combined with upstream stations current time frequency range currently in use to be different frequency range To ensure normally to communicate between each point of termination station, i.e., all frequency ranges that PLC network is supported can be carried out selecting, It selects to realize inter-frequency networking when different frequency ranges.
Optionally, in some embodiments, which is that the frequency range of current time transmission signal is corresponding Preamble sequence, for example, frequency range f shown in FIG. 11Corresponding preamble sequence.
It should be understood that the frequency range in PLC network can be identified by preamble sequence, different frequency ranges uses different Preamble sequence, therefore, in embodiments of the present invention, when being unable to normal communication between point of termination station or point of termination station networks, Since the point of termination station for being unable to the downstream endpoint website of normal communication or newly networking is in off-line state, at this point, the downstream endpoint Website or the point of termination station newly to network can not receive the signal of upstream end website transmission, therefore, it is impossible to directly to downstream end Frequency range where end station point or the point of termination station newly to network switches over, but the downstream endpoint website or the terminal station that newly networks Point can receive the preamble sequence of upstream end website transmission, therefore the lead code that can be sent by upstream end website The matching for the preamble sequence supported in sequence and PLC network determines that the downstream website needs the frequency range for selecting or switching.
Optionally, in some embodiments, PLC network support can be only stored in the preamble sequence set that prestores in advance The corresponding preamble sequence of frequency range in one, the only storage frequency range f in preamble sequence set for example, this prestores1It is corresponding Preamble sequence, other corresponding preamble sequences of other frequency ranges that preamble sequence i.e. PLC network is supported that prestore can pass through The preamble sequence being stored in advance in prestoring preamble sequence set carries out cyclic shift and obtains, in favor of point of termination station section Signaling overheads is saved, the wasting of resources is avoided.
Specifically, a pre-stored preamble sequence in obtaining the preamble sequence set that prestores, i.e., first is pre- After depositing preamble sequence, according to the quantity for the frequency range that the PLC network is supported, different cyclic shift length is determined, according to not Same cyclic shift length, the phase for prestoring preamble sequence to first carry out cyclic shift, obtain the different lead codes that prestores The corresponding phase of sequence, so as to obtain in the corresponding preamble sequence of the frequency range supported in the PLC network except this is first pre- The others except preamble sequence are deposited to prestore preamble sequence.
For example, this prestores, pre-stored preamble sequence is frequency range f in preamble sequence set1Corresponding lead code sequence Row, the frequency range which supports includes f1,f2,f3,f4,f5, needing to obtain frequency range f2It, can when corresponding preamble sequence With to frequency range f1The phase of corresponding preamble sequence carries out one cycle displacement, obtains frequency range f2Corresponding preamble sequence, It is needing to obtain frequency range f3It, can be to frequency range f when corresponding preamble sequence1The phase of corresponding preamble sequence carries out twice Cyclic shift obtains frequency range f3Corresponding preamble sequence.
Optionally, in some embodiments, it carries out cyclic shift in the phase for prestoring preamble sequence to first and obtains it He prestore preamble sequence when, it is necessary first to determine this first prestore the corresponding frequency range of preamble sequence subcarrier phase, Using the phase as initial phase, need to obtain other frequency ranges prestore preamble sequence when, really to the initial phase Carry out different cyclic shifts, the phase of the subcarrier of the frequency range needed, using carry out cyclic shift after phase as Target phase, according to the target phase, it may be determined that the corresponding preamble sequence that prestores of the target phase, so that it is determined that going out to prestore Other preamble sequences that prestore to prestore in addition to preamble sequence except first in preamble sequence set.
Any one preamble sequence that prestores it should be understood that this prestores in preamble sequence set can be according to identical source Preamble sequence carries out being converted to for different phases, which can be that the frequency range that PLC network is supported corresponds to Preamble sequence in any one preamble sequence, for example, first prestoring preamble sequence of using of the embodiment of the present invention, Can also be other preamble sequences, the present invention does not limit this.
Optionally, in some embodiments, it is corresponding can also only to store the frequency range that PLC network is supported for first terminal website One in preamble sequence, PLC network current time send signal frequency range with stored in first terminal equipment it is leading When the corresponding frequency range of code sequence differs, it can be carried out by the phase of the preamble sequence stored to first terminal website different Cyclic shift obtain.
Optionally, in some embodiments, the pre-stored preamble sequence of first terminal website may not be PLC nets The corresponding preamble sequence of frequency range that network is supported, can be any one preamble sequence, as long as the frequency range for sending signal corresponds to Preamble sequence i.e. the first preamble sequence can carry out phase according to the pre-stored preamble sequence of the first terminal website Position obtains, the frequency that the embodiment of the present invention is only supported using the pre-stored preamble sequence of first terminal website as PLC network It is illustrated for the corresponding preamble sequence of a frequency range in section, but the embodiment of the present invention does not limit.
Specifically, first terminal website first determines that any one frequency range in the frequency range that PLC network is supported is corresponding leading The phase of code sequence, can be by initial reference phase it needs to be determined that when the first preamble sequence as initial reference phase Position carries out cyclic shift, obtains first fixed phase, to obtain first preamble sequence by first fixed phase.
Optionally, in some embodiments, the detailed process for the first fixed phase being obtained by initial reference phase can be with For:According to PLC network current time send signal frequency range preamble sequence corresponding with initial reference phase frequency range it Between number of frequency bands, the length for needing to carry out cyclic shift is determined, in the length according to the cyclic shift of the determination, to initially joining It examines phase and carries out cyclic shift, obtain the first fixed phase.
In embodiments of the present invention, the phase of different preamble sequences is obtained by cyclic shift, to obtain different frequencies The corresponding preamble sequence of section can make point of termination station not have to store multiple preamble sequences, to save point of termination station Memory space, save signaling overheads, avoid the wasting of resources.
Optionally, in some embodiments, the first preamble sequence is being matched with the preamble sequence that prestores, is being determined It, can be by by first preamble sequence lead code sequence corresponding with the frequency range that PLC network is supported when target preamble sequence Row carry out related operation, and the corresponding preamble sequence of frequency range which supports is the in prestoring preamble sequence set The preamble sequence that prestores that one phase for prestoring preamble sequence is obtained by different cyclic shifts, carry out related operation it Afterwards, multiple peak-to-average force ratios are determined, when peak-to-average force ratio is more than the first predetermined threshold value, which is more than the pre- of the first predetermined threshold value It deposits preamble sequence and is determined as target preamble sequence.
It should be understood that peak-to-average force ratio be more than the first predetermined threshold value prestore preamble sequence may only there are one, it is also possible to have more A, the preamble sequence that prestores that the embodiment of the present invention can will be greater than the first predetermined threshold value is all used as target preamble sequence, can To select the preamble sequence that prestores as before target in the preamble sequence that prestores for being more than the first predetermined threshold value at random Code-guiding sequence can also select mesh by certain rule from multiple preamble sequences that prestore more than first predetermined threshold value Preamble sequence is marked, which can be chosen in the multiple preamble sequences that prestore for being more than the first predetermined threshold value That maximum preamble sequence that prestores of peak-to-average force ratio is as target preamble sequence.
Optionally, in some embodiments, the first preamble sequence is being matched with the preamble sequence that prestores, is being determined When target preamble sequence, the first preamble sequence preamble sequence corresponding with the frequency range that PLC network is supported can be carried out The maximum lead code that prestores of the ratio of peak-to-average force ratio is determined as target lead code by related operation when obtaining peak-to-average force ratio.
It should be understood that the present invention is only to select the maximum preamble sequence that prestores of the ratio of peak-to-average force ratio as target lead code sequence It is classified as example to illustrate, but it's not limited to that for the embodiment of the present invention.
Optionally, in some embodiments, before being matched the first preamble sequence with the preamble sequence that prestores, The communication success rate for needing first to determine the second terminal website and first terminal website is less than the second default threshold in communication success rate When value, then the first preamble sequence and the described preamble sequence set each of that prestores prestored preamble sequence progress Match;When communicating success rate higher than the second predetermined threshold value, illustrate to use between first terminal website and second terminal website at this time Frequency range can also keep normal communication, frequency range switching or selection need not be carried out, thus without by the first preamble sequence with Described each of the preamble sequence set that the prestores preamble sequence that prestores is matched.
Optionally, which can be empirical value, and the success rate by counting usually PLC network communication obtains .
Optionally, in some embodiments, before being matched the first preamble sequence with the preamble sequence that prestores, Also need to determine the frame head of the first preamble sequence in First ray, because the First ray of second terminal station for acquiring is packet One section of very long sequence containing the first preamble sequence may also include noise signal or other interference signals in the First ray Preamble sequence, second terminal website needs to find the frame head of first lead code, just can be by first preamble sequence Preamble sequence is matched with prestoring.
It, can be by the First ray according to preamble sequence specifically, the length due to preamble sequence is certain Length is divided into several subsequences, in the frame head of the first preamble sequence in determining the First ray, can will divide first At several subsequences in the first subsequence and the second subsequence carry out related operation, obtain relevant peaks, determine the correlation Whether peak is more than third predetermined threshold value, when the relevant peaks are more than the third predetermined threshold value, then the start bit of first subsequence The initial position for setting the first lead code for including in First ray, the relevant peaks be less than third predetermined threshold value when, then after It is continuous that second subsequence and third subsequence are subjected to related operation, the relevant peaks and third predetermined threshold value that comparison operation obtains again Size, until determining the frame head of the first preamble sequence in the First ray.
It should be understood that there may be multiple first preamble sequences in the First ray, by the first preamble sequence and in advance When depositing preamble sequence and being matched, can be by the First ray any one preamble sequence and the lead code sequence that prestores Row are matched.
It should also be understood that in the first preamble sequence frame head in determining First ray, the first lead code sequence of the determination The frame head of row may be the initial position of first the first preamble sequence in the First ray, it is also possible to wherein any one A first targeting sequencing initial position, it is not limited in the embodiment of the present invention.
In embodiments of the present invention, the preamble sequence that second terminal website is sent by the first terminal website that will be received Preamble sequence corresponding with the frequency range that PLC network is supported is matched, and the frequency range for needing to select or switch is determined, to realize The function of PLC network inter-frequency networking, and the rate of Frequency Band Selection and switching between each point of termination station in PLC network is improved, subtract The time that small point of termination station networks.
Fig. 4 is the schematic flow chart of the method 400 of the Frequency Band Selection of the embodiment of the present invention, and this method 400 is whole by first End station point executes, for example, executed by the upstream stations being unable in PLC network in certain two website of normal communication, or by newly entering Upstream end website execution of the point of termination station of net etc., as shown in figure 4, this method 400 includes:
410, determine initial reference phase.
Optionally, in some embodiments, which is any one frequency in the frequency range that PLC network is supported The phase of the corresponding subcarrier of section, and the initial reference phase corresponds to one section of preamble sequence in the time domain.
It should be understood that the corresponding preamble sequence of initial reference phase can be arbitrary in the frequency range that PLC network is supported The corresponding preamble sequence of one frequency range, can also be the corresponding preamble sequence of other frequency ranges, the embodiment of the present invention is to this It does not limit, the embodiment of the present invention only can be the frequency range of PLC network support with the corresponding preamble sequence of initial reference phase In the corresponding preamble sequence of any one frequency range for illustrate.
420, determine the length for needing to carry out cyclic shift.
Optionally, in some embodiments, frequency range and initial ginseng of the length of the cyclic shift by currently transmitted signal The number of frequency bands examined between the corresponding frequency range of phase determines.
For example, the pre-stored preamble sequence of first terminal website is frequency range f1Corresponding preamble sequence, when current It is frequency range f to carve and send the frequency range of signal3, so the length for needing to carry out cyclic shift at this time is 2.
430, according to the length of cyclic shift, determine the first fixed phase.
Optionally, in some embodiments, which is the corresponding son of frequency range for sending signal at current time The phase of carrier wave.
Optionally, in some embodiments, according to the length of determining cyclic shift, initial reference phase is recycled Displacement, obtains the first fixed phase.
For example, the pre-stored preamble sequence of first terminal website is frequency range f1Corresponding preamble sequence, just at this time Beginning fixed phase is frequency range f1The phase of corresponding subcarrier, the frequency range that current time sends signal are frequency range f3, it is therefore desirable to it obtains Obtain frequency range f3Corresponding preamble sequence can carry out cyclic shift twice to initial reference phase, obtain frequency range f3Corresponding son The fixed phase of carrier wave, frequency range f3The fixed phase of corresponding subcarrier is the first fixed phase.
440, according to the first fixed phase, determine the first preamble sequence.
Optionally, in some embodiments, inverse fast Fourier transform (Inverse Fast are carried out to the first fixed phase Fourier Transform, IFFT transformation), determine the first preamble sequence.
In embodiments of the present invention, first terminal website to second terminal website when sending preamble sequence, the transmission Preamble sequence may not be stored directly in first terminal website, need the lead code stored by first terminal website The phase of sequence carries out the preamble sequence that cyclic shift obtains needing to be sent to second terminal website, so as to save first The memory space of point of termination station saves the signaling overheads of first terminal website, avoids the wasting of resources.
Fig. 5 is the schematic flow chart of the method 500 of the Frequency Band Selection of the embodiment of the present invention, and this method 500 is whole by second End station point executes, for example, this method 500 can be held by the downstream endpoint website being unable in certain two point of termination station of normal communication Row, or the point of termination station by newly networking execute, as shown in figure 5, this method 500 includes:
510, receive the data information that first terminal website is sent.
520, it determines with whether the communication success rate of first terminal website is more than the second predetermined threshold value.
Optionally, in some embodiments, second terminal website needs to determine the second terminal website and first in real time eventually The communication success rate of end station point, communicate success rate be less than the second predetermined threshold value when, then by the first preamble sequence with it is described pre- Each of preamble sequence set preamble sequence that prestores is deposited to be matched;It is higher than the second predetermined threshold value in communication success rate When, illustrate that the frequency range used between first terminal website and second terminal website at this time can also keep normal communication, does not need Frequency range switching is carried out, so leading without the first preamble sequence prestores with described each of the preamble sequence set that prestores Code sequence is matched.
530, when communicating success rate less than the second predetermined threshold value, determine the first sequence that the first terminal website received is sent The frame head of the first preamble sequence in row.
It should be understood that the First ray that the first terminal website that second terminal website receives is sent is to include the first lead code sequence One section of very long sequence of row may also contain noise signal or the preamble sequence of other interference signals in the First ray, Second terminal website needs to find the frame head of first lead code, just can be by first preamble sequence and the lead code that prestores Sequence is matched.
Optionally, in some embodiments, in the frame head of the first lead code in determining First ray, due to lead code Length it is certain, which can be divided into several subsequences according to the length of a preamble sequence, determine should When the frame head of the first preamble sequence in First ray, first can by several subsequences being divided into First ray with Second subsequence carries out related operation, obtains relevant peaks, determines whether the relevant peaks are more than third predetermined threshold value, in the relevant peaks When more than the third predetermined threshold value, then the initial position of first subsequence is the first lead code for including in First ray Then continue the second subsequence is related to the progress of third subsequence when the relevant peaks are less than third predetermined threshold value initial position Operation, the size for the relevant peaks and third predetermined threshold value that comparison operation obtains again, until determining the in the First ray The frame head of one preamble sequence.
It should be understood that in the first preamble sequence in determining First ray, the frame of the first preamble sequence of the determination Head may be the initial position of first preamble sequence in the First ray, it is also possible to which wherein any one is first leading Sequence start position, it is not limited in the embodiment of the present invention.
Optionally, in some embodiments, to carry out the relevant peaks that related operation obtains between any two in institute subsequence all small When the second predetermined threshold value, the First ray for including the first preamble sequence for receiving the transmission of first terminal website again is needed, Above-mentioned judgement is carried out again.
540, after the frame head of the first preamble sequence in determining First ray, by the first preamble sequence and in advance It deposits preamble sequence to be matched, determines peak-to-average force ratio.
Optionally, in some embodiments, the first preamble sequence is being matched with the preamble sequence that prestores, it can be with By the way that first preamble sequence preamble sequence corresponding with the frequency range that PLC network is supported is carried out related operation, the PLC nets The corresponding preamble sequence of frequency range that network is supported is that first preamble sequence that prestores in prestoring preamble sequence set passes through not The preamble sequence that prestores that same cyclic shift obtains determines multiple peak-to-average force ratios after carrying out related operation.
It optionally, in some embodiments, can when being matched the first preamble sequence with the preamble sequence that prestores By the method for time-sharing multiplex, the first preamble sequence to be matched one by one with the preamble sequence that prestores, until by PLC branch The corresponding preamble sequence of all frequency ranges held is matched with the first preamble sequence.
550, determine that the corresponding preamble sequence that prestores of the maximum value in peak-to-average force ratio is target preamble sequence.
It should be understood that in two sequences for carrying out related operation, peak-to-average force ratio is bigger, indicates that the similarity of two sequences is got over Height, therefore, the similarity highest of peak-to-average force ratio maximum prestore preamble sequence and the first preamble sequence, so most by peak-to-average force ratio The big preamble sequence that prestores is determined as target preamble sequence.
560, using the corresponding frequency range of target preamble sequence as the frequency range for needing to select to obtain switching.
In our inventive embodiments, second terminal website passes through the lead code sequence that the first terminal website that will receive is sent It arranges the preamble sequence supported with PLC network to be matched, determines the matched target of preamble sequence sent with the first website Preamble sequence determines the frequency range for needing selection according to the target preamble sequence of the determination, improves each website in PLC network Between frequency range switching or selection frequency range, reduce the network entry time of the point of termination station of networking.
Above in association with Fig. 3 to Fig. 5, the embodiment of the method for the embodiment of the present invention is described in detail, extremely below in conjunction with Fig. 6 The embodiment of the point of termination station of the embodiment of the present invention is described in detail in Fig. 9, it should be appreciated that point of termination station embodiment and embodiment of the method It corresponds, similar description is referred to embodiment of the method.
Fig. 6 show the schematic block diagram of the point of termination station 600 of the embodiment of the present invention, as shown in fig. 6, the point of termination station 600 include:
Acquisition module 610, for obtain first terminal website transmission First ray, the First ray include first before Code-guiding sequence, first preamble sequence are that the frequency range of current time transmission signal in power line communication PLC network is corresponding Preamble sequence;
Determining module 620, for first preamble sequence and each of the preamble sequence set that prestores to prestore Preamble sequence is matched, and determines that target preamble sequence, the preamble sequence that prestores are the frequency range pair that PLC network is supported The preamble sequence answered, the target preamble sequence are the preamble sequence that prestores for needing selection;
The determining module 620 is additionally operable to be determined as the corresponding frequency range of the target preamble sequence to need the frequency of selection Section.
It should be understood that the point of termination station 600 can be any one point of termination station in PLC network, for example, it may be occurring The downstream endpoint website of two unsmooth point of termination station is communicated, or the point of termination station newly to network.
It should also be understood that will can occur to communicate the upstream end website work in two unsmooth point of termination station in PLC network For first terminal website, downstream endpoint website is point of termination station 600, example as second terminal website, the second terminal website Such as, point of termination station C and point of termination station F shown in FIG. 1 are unable to normal communication, at this point it is possible to using point of termination station C as first terminal Website, point of termination station F is as point of termination station 600;Or it can also be using the point of termination station newly to network as point of termination station 600, newly The point of termination station of the upstream of the point of termination station of networking is as first terminal website, for example, point of termination station N shown in Fig. 2 is newly to enter The point of termination station of net, at this point it is possible to using point of termination station G as first terminal website, point of termination station N is as point of termination station 600.
In embodiments of the present invention, what point of termination station 600 obtained the transmission of first terminal website includes the first preamble sequence First ray, first preamble sequence be current time PLC network in send signal the corresponding preamble sequence of frequency range, Point of termination station 600 matches first preamble sequence preamble sequence corresponding with the frequency range that the PLC network is supported, really Set the goal preamble sequence, which is determined as the frequency range to be selected, needs selection Frequency range currently in use is possible different between frequency range and the other-end website in the PLC network, it is thereby achieved that alien frequencies group Net, and when frequency range between changes terminal website, the frequency range that need not be supported one by one PLC network be detected, and be improved The rate of selection and the switching of frequency range in PLC network between point of termination station reduces the time of point of termination station networking.
It should be understood that it is unsmooth when needing the frequency range used between switching terminal website to occur communication between point of termination station, this When, the frequency range that the frequency range of switching is used with other-end website can be the same or different, due between two point of termination station Have occurred communication it is unsmooth, former frequency range can not be further continued for using between two point of termination station, determine switching frequency range when, It only needs to carry out selection switching in other frequency ranges in addition to former frequency range supported from PLC network, as long as before other frequency ranges Code-guiding sequence corresponding with other-end website frequency range currently in use in PLC network preamble sequence matching, it is determined that its He can combine frequency range with the other-end website current time frequency range currently in use in the PLC network, ensure Normal communication between each point of termination station, it is thereby achieved that the function of inter-frequency networking, alternatively, occurring in two point of termination station Communicate it is unsmooth after the very short time in, former frequency range can make again again the communication between two point of termination station keep just Often, at this point, if having had begun frequency range switching, the frequency range switched can will be needed to be determined as former frequency range;In point of termination station When new networking, it can be frequency range identical with the frequency range that upstream stations current time uses to need the frequency range of selection at this time, also may be used It, can as long as the frequency range of the selection is combined with upstream stations current time frequency range currently in use to be different frequency range To ensure normally to communicate between each point of termination station, i.e., all frequency ranges that PLC network is supported can be carried out selecting, It selects to realize inter-frequency networking when different frequency ranges.
Optionally, in some embodiments, which is that the frequency range of current time transmission signal is corresponding Preamble sequence, for example, frequency range f shown in FIG. 11Corresponding preamble sequence.
It should be understood that the frequency range in PLC network can be identified by preamble sequence, different frequency ranges uses different Preamble sequence, therefore, in embodiments of the present invention, when being unable to normal communication between point of termination station or point of termination station networks, Since the point of termination station for being unable to the downstream endpoint website of normal communication or newly networking is in off-line state, at this point, the downstream endpoint Website or the point of termination station newly to network can not receive the signal of upstream end website transmission, therefore, it is impossible to directly to downstream end Frequency range where end station point or the point of termination station newly to network switches over, but the downstream endpoint website or the terminal station that newly networks Point can receive the preamble sequence of upstream end website transmission, therefore the lead code that can be sent by upstream end website The matching for the preamble sequence supported in sequence and PLC network, the frequency range that really the downstream website needs selection or switches.
Optionally, in some embodiments, which is additionally operable to the quantity of the frequency range of PLC network support, determines Different cyclic shift length.
Optionally, in some embodiments, which is additionally operable to according to the different cyclic shift length, right First phase for prestoring preamble sequence carries out different cyclic shifts, determines in the preamble sequence set that prestores except first prestores Other preamble sequences that prestore except preamble sequence, which is to prestore in preamble sequence set Pre-stored preamble sequence.
Optionally, in some embodiments, PLC network support can be only stored in the preamble sequence set that prestores in advance The corresponding preamble sequence of frequency range in one.
Frequency range f is only stored in preamble sequence set for example, this prestores1Corresponding preamble sequence, other prestore leading The corresponding preamble sequence of other frequency ranges that code sequence, that is, PLC network is supported can be stored in advance in the lead code sequence that prestores by this Preamble sequence in row set carries out cyclic shift and obtains, and so that point of termination station saves signaling overheads, avoids resource wave Take.
Any one preamble sequence that prestores it should be understood that this prestores in preamble sequence set can be according to identical source Preamble sequence carries out being converted to for different phases, which can be that the frequency range that PLC network is supported corresponds to Preamble sequence in any one preamble sequence, for example, first prestoring preamble sequence of using of the embodiment of the present invention, Can also be other preamble sequences, the present invention does not limit this.
Optionally, in some embodiments, the determining module 620 be specifically used for by first preamble sequence with it is described Each of the preamble sequence set that prestores prestore preamble sequence carry out related operation, determine peak-to-average force ratio;It is equal according to the peak Than the target preamble sequence in the preamble sequence that prestores described in determination.
Optionally, in some embodiments, which is specifically used for being more than the first predetermined threshold value in peak-to-average force ratio When, the preamble sequence that prestores that peak-to-average force ratio is more than to first predetermined threshold value is determined as target preamble sequence.
Optionally, in some embodiments, the preamble sequence that prestores for the first predetermined threshold value being more than in peak-to-average force ratio is more than one When a, the maximum lead code that prestores of peak-to-average force ratio that peak-to-average force ratio is more than in the preamble sequence that prestores of first predetermined threshold value is determined Sequence is target preamble sequence.
Optionally, in some embodiments, which is specifically used for determining that the maximum peak of ratio is equal in peak-to-average force ratio Than;The corresponding preamble sequence that prestores of the maximum peak-to-average force ratio of ratio in peak-to-average force ratio is determined as target preamble sequence.
It should be understood that the present invention is only to select the maximum preamble sequence that prestores of the ratio of peak-to-average force ratio as target lead code sequence It is classified as example to illustrate, but it's not limited to that for the embodiment of the present invention.
Optionally, in some embodiments, which is additionally operable to determine the point of termination station 600 and first terminal Whether the communication success rate of website is less than the second predetermined threshold value.
Optionally, in some embodiments, which further includes processing module 630, which uses In the communication success rate be less than second predetermined threshold value when, by first preamble sequence and the lead code that prestores Each of arrangement set preamble sequence that prestores is matched.
For example, when communicating success rate less than the second predetermined threshold value, processing module 630 is again by the first preamble sequence and institute Each of the preamble sequence set that the prestores preamble sequence that prestores is stated to be matched;It is higher than the second default threshold in communication success rate When value, illustrates that the frequency range used between first terminal website and second terminal website at this time can also keep normal communication, be not required to Frequency range switching or selection are carried out, so not needing processing module 630 by the first preamble sequence and the lead code sequence that prestores Each of the row set preamble sequence that prestores is matched.
Optionally, in some embodiments, which is additionally operable to before determining described first in first sequence The frame head of code-guiding sequence.
Optionally, in some embodiments, the First ray that point of termination station 600 obtains is to include the first preamble sequence One section of very long sequence may also include noise signal or the preamble sequence of other interference signals, terminal in the First ray Website 600 needs to find the frame head of first lead code, just can first preamble sequence and the preamble sequence progress that prestores Matching.
Specifically, the length due to preamble sequence is certain, determining module 620 can be by the First ray according to before one The length of code-guiding sequence is divided into several subsequences, first in the frame head of the first preamble sequence in determining the First ray Can first the first subsequence in several subsequences being divided into be subjected to related operation with the second subsequence, obtain relevant peaks, Determine whether the relevant peaks are more than third predetermined threshold value, when the relevant peaks are more than the third predetermined threshold value, then the first sub- sequence The initial position of row is the initial position for the first lead code for including in First ray, and being less than third in the relevant peaks presets threshold When value, then continue the second subsequence and third subsequence carrying out related operation, the relevant peaks that comparison operation obtains again and the The size of three predetermined threshold values, until determining the frame head of the first preamble sequence in the First ray.
It should be understood that there may be multiple first preamble sequences in the First ray, by the first preamble sequence and in advance When depositing preamble sequence and being matched, can be by the First ray any one preamble sequence and the lead code sequence that prestores Row are matched.
It should also be understood that in the first preamble sequence frame head in determining First ray, the first lead code sequence of the determination The frame head of row may be the initial position of first the first preamble sequence in the First ray, it is also possible to wherein any one A first targeting sequencing initial position, it is not limited in the embodiment of the present invention.
In embodiments of the present invention, the preamble sequence that point of termination station 600 is sent by the first terminal website that will be received Preamble sequence corresponding with the frequency range that PLC network is supported is matched, and the frequency range for needing to select or switch is determined, to realize The function of PLC network inter-frequency networking, and the rate of Frequency Band Selection and switching between each point of termination station in PLC network is improved, subtract The time that small point of termination station networks.
It should be understood that point of termination station 600 according to the ... of the embodiment of the present invention can correspond to the second terminal in the embodiment of the present invention Website, and the above and other operation and/or function of the modules in the point of termination station 600 is realized in Fig. 3 to Fig. 5 respectively Each method corresponding flow, for sake of simplicity, details are not described herein.
Fig. 7 is the schematic diagram of point of termination station 700 according to the ... of the embodiment of the present invention.As shown in fig. 7, the point of termination station 700 include memory 710 and processor 720, mutual by internal connecting path between the memory 710 and processor 720 Control and/or data-signal are transmitted in communication.
The memory 710 is for storing program code;
The processor 720 is for calling said program code to realize the method in the various embodiments described above of the present invention.
In embodiments of the present invention, processor 720 can be central processing unit (central processing unit, CPU), the combination of network processing unit (network processor, NP) or CPU and NP.Processor can further include Hardware chip.Above-mentioned hardware chip can be application-specific integrated circuit (application-specific integrated Circuit, ASIC), programmable logic device (programmable logic device, PLD) or combinations thereof.
An embodiment of the present invention provides a kind of computer-readable mediums, for storing computer program code, the computer Program includes the instruction for executing the method for the Frequency Band Selection of the embodiment of the present invention in above-mentioned Fig. 3 to Fig. 5.The readable medium can Be read-only memory (read-only memory, ROM) or random access memory (random access memory, RAM), the embodiment of the present invention is without limitation.
Fig. 8 show the schematic frame diagram of the point of termination station 800 of the embodiment of the present invention, as shown in figure 8, the point of termination station 800 include:
Determining module 810, for determining that initial reference phase, the initial reference phase are power line communication PLC network The phase of the corresponding subcarrier of any one frequency range in the frequency range of support;
Generation module 820, for according to the initial reference phase, generating the first preamble sequence, the first lead code sequence It is classified as the corresponding preamble sequence of frequency range of current time transmission signal in the PLC network;
Sending module 830, for sending First ray to second terminal website, the First ray includes before described first Code-guiding sequence.
It should be understood that the point of termination station 800 can be any one point of termination station in PLC network, for example, it may be occurring Communicate the upstream end website of two unsmooth point of termination station, or the point of termination station newly to network upstream stations, for example, can To be the first terminal website in method 300.
Optionally, in some embodiments, which is additionally operable to, according to initial reference phase, determine the first ginseng Phase is examined, which is the phase for the corresponding subcarrier of frequency range that current time sends signal in PLC network.
Optionally, in some embodiments, which is used to, according to the first fixed phase, it is leading to generate first Code sequence.
Optionally, in some embodiments, determining module 810 is specifically used for sending letter according to current time in PLC network Number frequency range frequency range corresponding with initial reference phase between number of frequency bands, determine the length of cyclic shift;It is moved according to cycle The length of position carries out cyclic shift to initial reference phase, determines the first fixed phase.
It should be understood that the point of termination station 800 can also be stored only in the corresponding preamble sequence of frequency range that PLC network is supported One, the frequency range frequency corresponding with the preamble sequence stored in first terminal equipment of signal is sent at PLC network current time When section differs, different cyclic shifts can be carried out by the phase of the preamble sequence stored to first terminal website and obtained It arrives.
Optionally, in some embodiments, 800 pre-stored preamble sequence of point of termination station may not be PLC nets The corresponding preamble sequence of frequency range that network is supported, can be any one preamble sequence, as long as the frequency range for sending signal corresponds to Preamble sequence i.e. the first preamble sequence can carry out phase according to the pre-stored preamble sequence of the first terminal website Position obtains, the frequency that the embodiment of the present invention is only supported using the pre-stored preamble sequence of first terminal website as PLC network It is illustrated for the corresponding preamble sequence of a frequency range in section, but the embodiment of the present invention does not limit.
In embodiments of the present invention, determining module 810 determines the phase of different preamble sequences by cyclic shift, to The corresponding preamble sequence of different frequency range is obtained, point of termination station can be made not have to store multiple preamble sequences, to save The memory space of point of termination station, saves signaling overheads, avoids the wasting of resources.
It should be understood that point of termination station 800 according to the ... of the embodiment of the present invention can correspond to the first terminal in the embodiment of the present invention Website, and the above and other operation and/or function of the modules in the point of termination station 800 is realized in Fig. 3 to Fig. 5 respectively Each method corresponding flow, for sake of simplicity, details are not described herein.
Fig. 9 is the schematic diagram of terminal device 900 according to the ... of the embodiment of the present invention.As shown in figure 9, the terminal is set Standby 900 include memory 910 and processor 920, mutual by internal connecting path between the memory 910 and processor 920 It communicates, transmits control and/or data-signal.
The memory 910 is for storing program code;
The processor 920 is for calling said program code to realize the method in the various embodiments described above of the present invention.
In embodiments of the present invention, processor 920 can be central processing unit (central processing unit, CPU), the combination of network processing unit (network processor, NP) or CPU and NP.Processor can further include Hardware chip.Above-mentioned hardware chip can be application-specific integrated circuit (application-specific integrated Circuit, ASIC), programmable logic device (programmable logic device, PLD) or combinations thereof.
An embodiment of the present invention provides a kind of computer-readable mediums, for storing computer program code, the computer Program includes the instruction for executing the method for the Frequency Band Selection of the embodiment of the present invention in above-mentioned Fig. 3 to Fig. 5.The readable medium can Be read-only memory (read-only memory, ROM) or random access memory (random access memory, RAM), the embodiment of the present invention is without limitation.
Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme 's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be expressed in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes:USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can to store program code Medium.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (22)

1. a kind of method of Frequency Band Selection, which is characterized in that the method includes:
The First ray that first terminal website is sent is obtained, the First ray includes the first preamble sequence, before described first Code-guiding sequence is the corresponding preamble sequence of frequency range that current time sends signal in power line communication PLC network;
First preamble sequence and each of the preamble sequence set that prestores preamble sequence that prestores are matched, really Set the goal preamble sequence, and the preamble sequence that prestores is the corresponding preamble sequence of frequency range that PLC network is supported, the mesh Mark preamble sequence is the preamble sequence that prestores for needing selection;
It is determined as the corresponding frequency range of the target preamble sequence to need the frequency range of selection.
2. according to the method described in claim 1, it is characterized in that, described by first preamble sequence and the lead code that prestores Each of arrangement set prestores before preamble sequence matched, and the method further includes:
According to the quantity for the frequency range that the PLC network is supported, different cyclic shift length is determined;
According to the different cyclic shift length, the phase for prestoring preamble sequence to first carries out different cyclic shifts, Other preamble sequences that prestore to prestore in addition to preamble sequence except described first in the preamble sequence set that prestores described in determination, Described first prestores preamble sequence as pre-stored preamble sequence in the preamble sequence set that prestores.
3. method according to claim 1 or 2, which is characterized in that described by first preamble sequence and before prestoring Each of code-guiding sequence set preamble sequence that prestores is matched, and determines target preamble sequence, including:
First preamble sequence and described each of the preamble sequence set that prestores preamble sequence that prestores are subjected to phase Operation is closed, determines peak-to-average force ratio;
According to the peak-to-average force ratio, the target preamble sequence in the preamble sequence that prestores described in determination.
4. according to the method described in claim 3, it is characterized in that, described according to the peak-to-average force ratio, determine described in prestore it is leading Target preamble sequence in code sequence, including:
When the peak-to-average force ratio is more than the first predetermined threshold value, the peak-to-average force ratio is more than described in first predetermined threshold value and is prestored Preamble sequence is determined as target preamble sequence.
5. according to the method described in claim 4, it is characterized in that, being more than the institute of first predetermined threshold value in the peak-to-average force ratio State the preamble sequence that prestores it is more than one when, determine that the peak-to-average force ratio is more than the lead code that prestores of first predetermined threshold value The maximum preamble sequence that prestores of peak-to-average force ratio in sequence is the target preamble sequence.
6. according to the method described in claim 3, it is characterized in that, described according to the peak-to-average force ratio, determine described in prestore it is leading Target preamble sequence in code sequence, including:
Determine the maximum peak-to-average force ratio of ratio in the peak-to-average force ratio;
The corresponding preamble sequence that prestores of the maximum peak-to-average force ratio of ratio in the peak-to-average force ratio is determined as the target Preamble sequence.
7. method according to any one of claim 1 to 6, which is characterized in that described by first preamble sequence It prestores before preamble sequence matched with each of the preamble sequence set that prestores, the method further includes:
It determines with whether the communication success rate of the first terminal website is less than the second predetermined threshold value;
The communication success rate be less than second predetermined threshold value when, by first preamble sequence with it is described prestore it is leading Each of the sequence sets conjunction preamble sequence that prestores is matched.
8. method according to any one of claim 1 to 7, which is characterized in that described by first preamble sequence It prestores before preamble sequence matched with each of the preamble sequence set that prestores, the method further includes:
Determine the frame head of first preamble sequence in the First ray.
9. a kind of method of Frequency Band Selection, which is characterized in that the method includes:
Determine that initial reference phase, the initial reference phase are any one in the frequency range that power line communication PLC network is supported The phase of the corresponding subcarrier of a frequency range;
According to the initial reference phase, the first preamble sequence is generated, the first preamble sequence is current in the PLC network Moment sends the corresponding preamble sequence of frequency range of signal;
First ray is sent to second terminal website, the First ray includes first preamble sequence.
10. according to the method described in claim 9, it is characterized in that, described according to the initial reference phase, before generating first Code-guiding sequence, including:
According to the initial reference phase, determine that the first fixed phase, first fixed phase are current in the PLC network Moment sends the phase of the corresponding subcarrier of frequency range of signal;
According to first fixed phase, first preamble sequence is generated.
11. according to the method described in claim 10, it is characterized in that, described according to the initial reference phase, first is determined Fixed phase, including:
Between the frequency range frequency range corresponding with the initial reference phase for sending signal according to current time in the PLC network Number of frequency bands determines the length of cyclic shift;
According to the length of the cyclic shift, cyclic shift is carried out to the initial reference phase, determines that described first refers to phase Position.
12. a kind of point of termination station, which is characterized in that the point of termination station includes:
Acquisition module, the First ray for obtaining the transmission of first terminal website, the First ray include the first lead code sequence Row, first preamble sequence are the corresponding lead code of frequency range that current time sends signal in power line communication PLC network Sequence;
Determining module, for first preamble sequence and each of the preamble sequence set that prestores to prestore lead code sequence Row are matched, and determine target preamble sequence, the preamble sequence that prestores is that the frequency range that PLC network is supported is corresponding leading Code sequence, the target preamble sequence are the preamble sequence that prestores for needing selection;
The determining module is additionally operable to be determined as the corresponding frequency range of the target preamble sequence to need the frequency range of selection.
13. point of termination station according to claim 12, which is characterized in that the determining module is additionally operable to according to the PLC The quantity of the frequency range of network support determines different cyclic shift length;
The determining module is additionally operable to according to the different cyclic shift length, to first prestore preamble sequence phase into The different cyclic shift of row, determine described in prestore in preamble sequence set except described first prestores its in addition to preamble sequence He prestores preamble sequence, and described first prestores before preamble sequence is pre-stored in the preamble sequence set that prestores Code-guiding sequence.
14. point of termination station according to claim 12 or 13, which is characterized in that the determining module is specifically used for:
First preamble sequence and described each of the preamble sequence set that prestores preamble sequence that prestores are subjected to phase Operation is closed, determines peak-to-average force ratio;
According to the peak-to-average force ratio, the target preamble sequence in the preamble sequence that prestores described in determination.
15. point of termination station according to claim 14, which is characterized in that the determining module is specifically used for:
When the peak-to-average force ratio is more than the first predetermined threshold value, the peak-to-average force ratio is more than described in first predetermined threshold value and is prestored Preamble sequence is determined as target preamble sequence.
16. point of termination station according to claim 15, which is characterized in that be more than the described first default threshold in the peak-to-average force ratio When the preamble sequence that prestores of value is more than one, determine that the peak-to-average force ratio is more than the described of first predetermined threshold value and prestores The maximum preamble sequence that prestores of peak-to-average force ratio in preamble sequence is the target preamble sequence.
17. point of termination station according to claim 14, which is characterized in that the determining module is specifically used for:
Determine the maximum peak-to-average force ratio of ratio in the peak-to-average force ratio;
The corresponding preamble sequence that prestores of the maximum peak-to-average force ratio of ratio in the peak-to-average force ratio is determined as the target Preamble sequence.
18. the point of termination station according to any one of claim 12 to 17, which is characterized in that the determining module is additionally operable to It determines with whether the communication success rate of the first terminal website is less than the second predetermined threshold value;
The point of termination station further includes:
Processing module is used for when the communication success rate is less than second predetermined threshold value, by first preamble sequence It is matched with described each of the preamble sequence set that the prestores preamble sequence that prestores.
19. the point of termination station according to any one of claim 12 to 18, which is characterized in that the determining module is additionally operable to Determine the frame head of first preamble sequence in first sequence.
20. a kind of point of termination station, which is characterized in that the point of termination station includes:
Determining module, for determining that initial reference phase, the initial reference phase are the frequency that power line communication PLC network is supported The phase of the corresponding subcarrier of any one frequency range in section;
Generation module, for according to the initial reference phase, generating the first preamble sequence, the first preamble sequence is described Current time sends the corresponding preamble sequence of frequency range of signal in PLC network;
Sending module, for sending First ray to second terminal website, the First ray includes the first lead code sequence Row.
21. point of termination station according to claim 20, which is characterized in that the determining module is additionally operable to according to described initial Fixed phase determines that the first fixed phase, first fixed phase are the frequency that current time sends signal in the PLC network The phase of the corresponding subcarrier of section;
The generation module is specifically used for, according to first fixed phase, generating first preamble sequence.
22. point of termination station according to claim 21, which is characterized in that the determining module is specifically used for:
Between the frequency range frequency range corresponding with the initial reference phase for sending signal according to current time in the PLC network Number of frequency bands determines the length of cyclic shift;
The processing module is additionally operable to the length according to the cyclic shift, and cyclic shift is carried out to the initial reference phase, Determine first fixed phase.
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