CN104579616A - Multi-antenna multichannel multisite aggregated parallel polling method - Google Patents
Multi-antenna multichannel multisite aggregated parallel polling method Download PDFInfo
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- CN104579616A CN104579616A CN201510053450.1A CN201510053450A CN104579616A CN 104579616 A CN104579616 A CN 104579616A CN 201510053450 A CN201510053450 A CN 201510053450A CN 104579616 A CN104579616 A CN 104579616A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/20—Arrangements affording multiple use of the transmission path using different combinations of lines, e.g. phantom working
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Abstract
The invention discloses a multi-antenna multichannel multisite aggregated parallel polling method for solving the problem of low data collection efficiency of large-scale distributed sites. Under the condition that an access point AP is configured with multiple antennas and multiple channels and a collection terminal is configured with a single antenna and multiple channels, a multisite aggregated CF-Poll control frame is designed based on an existing IEEE 802.11ac communication standard, and a specific single-channel multisite aggregated polling method and the multi-antenna multichannel multisite aggregated parallel polling method between the multi-antenna multichannel AP and the single-antenna site are given. The method is particularly suitable for asymmetric data transmission application scenes, with more uplink sites and small single data collection amount, for downlink transmission of a small amount of command data.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of multiple antennas multichannel polymerization multi-site parallel polling method.The method devises polymerization multi-site CF-Poll control frame, and gives concrete many radio frequencies multiple channels access point AP and be polymerized multi-site polling method with the single channel between single antenna website and multiple antennas multichannel is polymerized multi-site parallel polling method.
Background technology
The application scenarios of common large-scale wireless collection has: the deformation monitoring, seismic region intensity monitoring, landslide mud-rock flow on-site data gathering, hydrology-water quality environmental monitoring etc. of the health monitoring of power high voltage transmission line, road and rail bridge deformation monitoring, reservoir dam.
These large-scale wireless gather the information transmission of website and have following features: (1) does not require that the moment carries out the uplink of data, and taken at regular intervals is uploaded, gap periods can be minute level even little time level.(2) website is many, and may be uneven due to factor position distribution such as landform.(3) data message of each website is extremely important, and the relation common people security of the lives and property, needs transmitting.
Gather for large-scale distributed site information, traditional channel access mode based on competition can not be adopted, the service quality (Quality of Service, QoS) communicated can not be ensured like this.Therefore generally adopt access point (Access Point, AP) to concentrate the mode of poll website to carry out the transmission of data.
Existing is that AP carries out single site poll to some channels based on IEEE 802.11 polling method, as shown in Figure 1, its operation principle is: first AP sets up one by beacon frame and exempt from the competition phase (ContentionFree Period, CFP), then AP uses the CF-Poll each website of poll successively, and website transmits data to AP successively and confirms, AP carries out confirmation and the next website of poll, so repeatedly, until CF-End, namely CFP terminates.But this AP is by single channel, and successively poll single site method efficiency is not high, especially when extensive website, its drawback is particularly outstanding.This just needs those skilled in the art badly and solves corresponding technical problem.
Summary of the invention
The present invention is intended at least solve the technical problem existed in prior art, especially innovatively proposes a kind of multiple antennas multichannel polymerization multi-site parallel polling method.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of multiple antennas multichannel polymerization multi-site parallel polling method, its key is, comprises the steps:
Step 1, access point AP configures M antenna, N number of working channel, each antenna utilizes one or several working channels, or multiple antenna duplexer working channel, the corresponding working frequency points of each working channel, J configuration single antenna multichannel website, the working frequency points of each site configuration and channel width identical with access point AP, access point AP and collection website initial operating frequency f
0all known with total channel bandwidth B, described M, N, J are positive integer;
Step 2, access point AP is regularly set up by beacon frame and exempts from competition phase CFP, and then access point AP sends polymerization multi-site CF-Poll frame, and described polymerization multi-site CF-Poll frame is included in the MAC Address exempted from competition phase CFP and need the reception of all websites of poll;
Step 3, all websites carry out full working channel scanning, receive polymerization multi-site CF-Poll frame, each website checks that whether the destination address field that the MAC Address field of oneself and access point AP send is consistent respectively, under address field consistent state, working frequency points and the channel width of corresponding website is determined from polymerization multi-site CF-Poll frame, keep synchronous with the access point AP of this working frequency points, and the order of the poll website MAC Address field sent according to access point AP sends the data gathered successively to access point AP, until access point AP collects the data of all websites.
Described multiple antennas multichannel polymerization multi-site parallel polling method, preferably, described step 1 comprises:
Access point AP has M antenna, and the interval between antenna is greater than λ/2, and wherein λ is working frequency points corresponding wavelength, and separate orthogonal working channel has N number of, and each working channel carries out Dynamic Bandwidth Allocation, is respectively B
1..., B
n; The corresponding working frequency points of each working channel, the pass between working frequency points and channel width is
Wherein, f
ifor real work value of frequency point, f
0for initial radio frequency operation value of frequency point,
for front i-1 channel width summation, B
ifor each channel strip width values, k<i, and k, i are positive integer.
Described multiple antennas multichannel polymerization multi-site parallel polling method, preferably, described step 2 comprises:
The polymerization multi-site CF-Poll control frame of design, its design process is, in the MAC head frame control field of polymerization multi-site CF-Poll frame, type is set to 01 of 2 bits and controls, and subtype is 0011 of 4 bits; In the address field of MAC head, destination address TA is the MAC Address of access point AP, receiver address RA1 ..., RAn is all website MAC Address needing poll the CFP stage associated with access point AP; CO is channel operation field, completes radio frequency operation frequency and maps and channel width mapping; Other field of this control frame arranges default reference IEEE 802.11ac.
Described multiple antennas multichannel polymerization multi-site parallel polling method, preferably, described step 2 comprises:
Access point AP working channel number is N, and each working channel amount of bandwidth is B
n, total channel bandwidth is
; And the initial frequency of channel width is f
0, then the pass that in actual channel working frequency points and CO field, working frequency points maps is
f
i＝f
0+(L+1)B
0,0≤L≤255，
Wherein, f
0the initial frequency of channel width, B
0be minimum fixed-bandwidth, L is the minimum fixed-bandwidth number at interval between multi-channel operation frequency distance initial frequency, and decimal system L is converted to without after symbol binary number, is mapped in the working frequency points map field of 1 byte corresponding to CO;
Working frequency points f
0after fixing, determine that this exempts from the channel width of access point AP poll website in competition phase CFP, then the pass that in actual channel bandwidth and CO field, channel width maps is
B
i＝(K+1)B
0,0≤K≤255，
Wherein, K is with working frequency points f
0centered by, B
ichannel comprises minimum fixed-bandwidth B
0number, K is the minimum fixed-bandwidth number at interval between channel width distance initial frequency, and decimal system K is converted to without after symbol binary number, is mapped in the channel width map field of 1 byte corresponding to CO.
Described multiple antennas multichannel polymerization multi-site parallel polling method, preferably, described step 3 comprises:
Step 3-1, access point AP sets up the CFP being operated in different frequent points by different antenna transmission beacon frames at different radio frequencies point, the length of CFP is controlled by access point AP, its maximum duration is specified by the CFPMaxDuriation parameter in the CF parameter set of beacon frame, if CFP duration is longer than beacon frame interval, the moment transmission beacon frame that access point AP can be suitable during CFP; Access point AP ensures that this duration is always not more than CFPMaxDuriation;
Step 3-2, access point AP, after sending beacon frame, can continue transmission one polymerization multi-site CF-Poll frame, need the reception MAC Address of the association website of poll during this polymerization multi-site CF-Poll frame is included in CFP;
Step 3-3, after all websites are scanned by working channel, receive polymerization multi-site CF-Poll frame, check that whether the MAC Address of the receiver address RA field in polymerization multi-site CF-Poll frame is identical with this website MAC Address, if different, just upgrade the network allocation vector NAV value of oneself according to this website duration field value wherein; If identical, receiving station determines this working frequency points and channel width thereof according to the channel operation CO field received in polymerization multi-site CF-Poll frame, and is consistent with the access point AP be operated under this working channel;
Step 3-4, sends polymerization multi-site CF-Poll frame and after the short interFrameGap SIFS in interval at access point AP, and by the receiver address RA order in polymerization multi-site CF-Poll frame, all websites send the data collected successively to access point AP;
Step 3-5, access point AP, after the data successfully receiving website, send CF-ACK frame successively and confirm, until before CFP end cycle or at the end of, then send CF-End frame or CF-End and CF-ACK control frame, terminate this CFP cycle.
Described multiple antennas multichannel polymerization multi-site parallel polling method, preferably, also comprise: in the process of multiple-workstation point poll, all interFrameGaps are all the same, are SIFS.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
The method is particularly suitable for when many radio frequencies multichannel AP is polymerized multi-site polling method with the single channel between single antenna website and multiple antennas multichannel is polymerized multi-site parallel polling, the a small amount of director data of downlink transfer, the many and asymmetric data transmission applications scene that single image data amount is little of up website.Ensure that website and AP respond in time to establish the link, ensure that transfer of data is efficient, stable, accurate.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is polling method schematic diagram in prior art;
Fig. 2 is access point AP and site link schematic diagram in the present invention;
Fig. 3 is AP antenna and corresponding radio frequency operation frequency schematic diagram thereof in the present invention;
Fig. 4 is radio frequency operation frequency and respective channels bandwidth schematic diagram in the present invention;
Fig. 5 is polymerized multi-site CF-Poll control frame schematic diagram in the present invention;
Fig. 6 is single antenna multichannel polymerization multi-site parallel polling operating diagram in the present invention;
Fig. 7 is multiple antennas multichannel polymerization multi-site parallel polling operating diagram in the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The present invention discloses a kind of multiple antennas multichannel polymerization multi-site parallel polling method, specifically describes:
Application scenarios is: as shown in Figure 2, and AP needs the radio communication occasion of the large-scale distributed collection point of poll, is suitable for downlink data amount little, the many and asymmetric data transmission scenarios that data volume is little of up website.
AP antenna and corresponding radio frequency operation frequency thereof are as shown in Figure 3.
Fig. 4 is radio frequency operation frequency and respective channels bandwidth.The antenna number of AP is M, and the interval between antenna is greater than λ/2, and wherein λ is working frequency points corresponding wavelength, and described antenna is independent distribution.Separate orthogonal channel has N number of, and described orthogonal channel is the minimum channel that works alone, the bandwidth of each channel can identical also can not be identical, namely can carry out Dynamic Bandwidth Allocation, be respectively B
1..., B
n.The corresponding working frequency points of each channel, as shown in Figure 3, the relation between working frequency points and channel width is as formula
, wherein, f
ifor real work value of frequency point, f
0for initial radio frequency operation value of frequency point,
for front i-1 channel width summation, B
ifor each channel strip width values, k<i, and k, i are positive integer.
Wherein, the mapping relations between antenna number M and number of channel N are
1)M>N
A channel can be shared by multiple transmitting antenna, when communicating, launch identical signal, playing the effect of transmit diversity, can expand to multiplexing.
2)M＝N
A corresponding channel of antenna.
3)M<N
Except the independent corresponding channel of an antenna, to unnecessary channel, if idle channel, channel can be adopted to bundle, expand the channel width of certain some antenna, form Dynamic Bandwidth Allocation.
The default channel relevant configuration of AP and collection website, signals collecting terminal acquiescence is single antenna, possesses the working frequency points identical with AP and band width configuration, and can only be operated in a sub-channels frequency in the same period.The i.e. initial operating frequency f of AP and acquisition terminal
0all known with total channel bandwidth B.
In the process of poll, all interFrameGaps are all the same, are short interFrameGap (Shortinterframe space, SIFS).
The design of polymerization multi-site CF-Poll control frame
Type during table 1 frame controls and subtype
| Type | Type specification | Subtype | Subtype specification |
| 01 | Control | 0011 | Polymerization multi-site CF-Poll |
In Fig. 5, the polymerization multi-site CF-Poll control frame of design, its design process is, in the MAC head frame control field of polymerization multi-site CF-Poll frame, type is set to 01 of 2 bits and controls, and subtype is 0011 of 4 bits; In the address field of MAC head, TA is the MAC Address (6 byte) of access point AP, RA1 ..., RAn is all website MAC Address (being 6 bytes respectively) needing poll the CFP stage associated with access point AP, CO is the channel operation field of 2 bytes, completes radio frequency operation frequency and maps (1 byte) and channel width mapping (1 byte); Other field of this control frame arranges default reference IEEE 802.11ac.FCS is frame check position.
Concrete mapping relations in CO are as follows.
Working frequency points number and the number of channel are consistent, and as previously mentioned, the number of channel is N, and each channel size is B
n, total channel bandwidth is
.For ease of Digital Signal Processing, whole channel width B divides equally by 256 by we, and every a size is B
0=B/256, and the initial frequency of channel width is f
0, then the pass that in actual channel working frequency points and CO field, working frequency points maps is,
f
i＝f
0+(L+1)B
0,0≤L≤255，
Wherein, f
0the initial frequency of channel width, B
0that (real work channel width is not less than B to minimum fixed-bandwidth
0), L is the minimum fixed-bandwidth number at interval between multi-channel operation frequency distance initial frequency, and in CO field, L inserts corresponding " working frequency points mapping " field by being converted to without symbol binary number.
Working frequency points f
0after fixing, also need the channel width determining this CFP period AP poll website,
B
i＝(K+1)B
0,0≤K≤255，
Wherein, K is with working frequency points f
0centered by, B
ichannel comprises minimum fixed-bandwidth B
0number, in CO field, K inserts corresponding " channel width mapping " field by being converted to without symbol binary number.
Single channel polymerization multi-site polling method
AP selects 1 or m (m≤M) root Antenna Operation at channel i (i≤N), and all websites determine the communication channel of its correspondence by scan channel, and as shown in Figure 6, detailed process is as follows for single channel polymerization multi-site polling method:
(1) AP regularly sets up a CFP by beacon frame.The length of CFP is controlled by AP, and its maximum s duration is specified by the CFPMaxDuriation parameter in " the CF parameter set " of beacon frame.If CFP duration is longer than beacon interval, the moment transmission beacon that AP can be suitable during CFP.The actual duration of CFP is relevant with the data volume exchanged during CFP, but AP ensures that this duration is always not more than CFPMaxDuriation.
(2) AP is after sending beacon frame, and and then can send a polymerization multi-site CF-Poll frame, its concrete frame format is shown in shown in figure, needs the reception MAC Address of the association website of poll during this frame is included in CFP.
(3) all websites pass through scan channel, receive polymerization multi-site CF-Poll frame, check that whether the address of " RA " field in frame is identical with the address of oneself, if different, the NAV value of the just renewal oneself that basis " duration " field value is wherein suitable; If identical, receiving station determines working frequency points and the channel width thereof of oneself according to " channel operation (CO) " field wherein, and is consistent with the AP be operated under this channel.
(4) send polymerization multi-site CF-Poll frame and after the SIFS of interval at AP, by the RA order in polymerization multi-site CF-Poll, relevant website sends the data collected successively to AP.
(5) AP is after the DATA successfully receiving website, sends CF-ACK successively and confirms, until before CFP end cycle or at the end of, then send CF-End or CF-End+CF-ACK control frame and terminate this CFP cycle.
Multiple antennas multichannel polymerization multi-site parallel polling method
AP has M root antenna altogether, N number of channel, and the mapping rule respectively by above-mentioned antenna and channel sets up contact, and as shown in Figure 7, detailed process is as follows for so much antenna multichannel polymerization multi-site parallel polling method:
(1) AP regularly sets up parallel CFP by beacon frame at N number of different orthogonal channel.
(2) on any one channel, AP polling method in the cfp carries out according to above-mentioned " single channel polymerization multi-site polling method ".
Specific embodiment is
Rely on IEEE 802.11ac to be communication standard, using barrier lake emergency communication as application scenarios, wherein relaying balloon is as access point AP, and the direction finder that lake surface measures water level regimen is that example makes an explanation as distributed capture point as site object.
Relaying balloon access point AP is with 4 antennas, and 4 channels are example, and total channel is 80MHz, and total channel bandwidth initial frequency is f
0=5.735GHz, the corresponding working channel of every root antenna, each channel width is 20MHz, and working frequency points is respectively f
1=5.745GHz, f
2=5.755GHz, f
3=5.765GHz and f
4=5.775GHz.
The working terminal gathered is water-level gauge, has 300, is distributed in barrier lake regional.
Such as:
AP antenna 1 is operated in channel 1, and working frequency points is f
1, it is 2 that polling station is counted;
AP antenna 2 is operated in channel 2, and working frequency points is f
2, it is 4 that polling station is counted;
AP antenna 3 is operated in channel 3, and working frequency points is f
3, it is 6 that polling station is counted;
AP antenna 4 is operated in channel 4, and working frequency points is f
4, it is 8 that polling station is counted;
With antenna 2, the corresponding poll work station of channel 2 counts 4 for instantiation, access point AP regularly sets up CFP by beacon frame, access point AP sends beacon frame and polymerization multiple-workstation point CF-Poll frame simultaneously, the such as corresponding poll of this channel 24 working terminals, so the configuration of CF-Poll frame has been polymerized the CF-Poll frame of these 4 working terminals, whole 4 working terminals carry out working channel scanning, receive polymerization multiple-workstation point CF-Poll frame, each working terminal checks that whether the address field that the address field of oneself and access point AP send is consistent respectively, if address field can not be mated, the NAV value of oneself is just upgraded according to " duration " field value wherein, if address field matches, receiving workstation point determines working frequency points and the channel width thereof of oneself according to " channel operation (CO) " field wherein, and be consistent with the access point AP be operated under this working channel, transfer of data carried out to these 4 working terminals mutual, namely according to the RA order sent in polymerization multi-site CF-Poll frame, relevant working terminal sends the data collected successively to access point AP.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (6)
1. a multiple antennas multichannel polymerization multi-site parallel polling method, is characterized in that, comprise the steps:
Step 1, access point AP configures M antenna, N number of working channel, each antenna utilizes one or several working channels, or multiple antenna duplexer working channel, the corresponding working frequency points of each working channel, J configuration single antenna multichannel website, the working frequency points of each site configuration and channel width identical with access point AP, access point AP and collection website initial operating frequency f
0all known with total channel bandwidth B, described M, N, J are positive integer;
Step 2, access point AP is regularly set up by beacon frame and exempts from competition phase CFP, and then access point AP sends polymerization multi-site CF-Poll frame, and described polymerization multi-site CF-Poll frame is included in the MAC Address exempted from competition phase CFP and need the reception of all websites of poll;
Step 3, all websites carry out full working channel scanning, receive polymerization multi-site CF-Poll frame, each website checks that whether the destination address field that the MAC Address field of oneself and access point AP send is consistent respectively, under address field consistent state, working frequency points and the channel width of corresponding website is determined from polymerization multi-site CF-Poll frame, keep synchronous with the access point AP of this working frequency points, and the order of the poll website MAC Address field sent according to access point AP sends the data gathered successively to access point AP, until access point AP collects the data of all websites.
2. multiple antennas multichannel polymerization multi-site parallel polling method according to claim 1, it is characterized in that, described step 1 comprises:
Access point AP has M antenna, and the interval between antenna is greater than λ/2, and wherein λ is working frequency points corresponding wavelength, and separate orthogonal working channel has N number of, and each working channel carries out Dynamic Bandwidth Allocation, is respectively B
1..., B
n; The corresponding working frequency points of each working channel, the pass between working frequency points and channel width is
Wherein, f
ifor real work value of frequency point, f
0for initial radio frequency operation value of frequency point,
for front i-1 channel width summation, B
ifor each channel strip width values, k<i, and k, i are positive integer.
3. multiple antennas multichannel polymerization multi-site parallel polling method according to claim 1, it is characterized in that, described step 2 comprises:
The polymerization multi-site CF-Poll control frame of design, its design process is, in the MAC head frame control field of polymerization multi-site CF-Poll frame, type is set to 01 of 2 bits and controls, and subtype is 0011 of 4 bits; In the address field of MAC head, destination address TA is the MAC Address of access point AP, receiver address RA1 ..., RAn is all website MAC Address needing poll the CFP stage associated with access point AP; CO is channel operation field, completes radio frequency operation frequency and maps and channel width mapping; Other field of this control frame arranges default reference IEEE 802.11ac.
4. multiple antennas multichannel polymerization multi-site parallel polling method according to claim 3, it is characterized in that, described step 2 comprises:
Access point AP working channel number is N, and each working channel amount of bandwidth is B
n, total channel bandwidth is
and the initial frequency of channel width is f
0, then the pass that in actual channel working frequency points and CO field, working frequency points maps is
f
i＝f
0+(L+1)B
0,0≤L≤255，
Wherein, f
0the initial frequency of channel width, B
0be minimum fixed-bandwidth, L is the minimum fixed-bandwidth number at interval between multi-channel operation frequency distance initial frequency, and decimal system L is converted to without after symbol binary number, is mapped in the working frequency points map field of 1 byte corresponding to CO;
Working frequency points f
0after fixing, determine that this exempts from the channel width of access point AP poll website in competition phase CFP, then the pass that in actual channel bandwidth and CO field, channel width maps is
B
i＝(K+1)B
0,0≤K≤255，
Wherein, K is with working frequency points f
0centered by, B
ichannel comprises minimum fixed-bandwidth B
0number, K is the minimum fixed-bandwidth number at interval between channel width distance initial frequency, and decimal system K is converted to without after symbol binary number, is mapped in the channel width map field of 1 byte corresponding to CO.
5. multiple antennas multichannel polymerization multi-site parallel polling method according to claim 1, it is characterized in that, described step 3 comprises:
Step 3-1, access point AP sets up the CFP being operated in different frequent points by different antenna transmission beacon frames at different radio frequencies point, the length of CFP is controlled by access point AP, its maximum duration is specified by the CFPMaxDuriation parameter in the CF parameter set of beacon frame, if CFP duration is longer than beacon frame interval, the moment transmission beacon frame that access point AP can be suitable during CFP; Access point AP ensures that this duration is always not more than CFPMaxDuriation;
Step 3-2, access point AP, after sending beacon frame, can continue transmission one polymerization multi-site CF-Poll frame, need the reception MAC Address of the association website of poll during this polymerization multi-site CF-Poll frame is included in CFP;
Step 3-3, after all websites are scanned by working channel, receive polymerization multi-site CF-Poll frame, check that whether the MAC Address of the receiver address RA field in polymerization multi-site CF-Poll frame is identical with this website MAC Address, if different, just upgrade the network allocation vector NAV value of oneself according to this website duration field value wherein; If identical, receiving station determines this working frequency points and channel width thereof according to the channel operation CO field received in polymerization multi-site CF-Poll frame, and is consistent with the access point AP be operated under this working channel;
Step 3-4, sends polymerization multi-site CF-Poll frame and after the short interFrameGap SIFS in interval at access point AP, and by the receiver address RA order in polymerization multi-site CF-Poll frame, all websites send the data collected successively to access point AP;
Step 3-5, access point AP, after the data successfully receiving website, send CF-ACK frame successively and confirm, until before CFP end cycle or at the end of, then send CF-End frame or CF-End and CF-ACK control frame, terminate this CFP cycle.
6. multiple antennas multichannel polymerization multi-site parallel polling method according to claim 5, it is characterized in that, also comprise: in the process of multiple-workstation point poll, all interFrameGaps are all the same, are short interFrameGap SIFS.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106559904A (en) * | 2015-09-30 | 2017-04-05 | 中兴通讯股份有限公司 | The cut-in method and device of wireless network |
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| CN104579616B (en) | 2018-03-13 |
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