CN104994586A - Adaptive bandwidth transmitting mechanism suitable for ultrahigh-speed wireless local area network - Google Patents
Adaptive bandwidth transmitting mechanism suitable for ultrahigh-speed wireless local area network Download PDFInfo
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- CN104994586A CN104994586A CN201510377578.3A CN201510377578A CN104994586A CN 104994586 A CN104994586 A CN 104994586A CN 201510377578 A CN201510377578 A CN 201510377578A CN 104994586 A CN104994586 A CN 104994586A
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- subchannel
- local area
- wireless local
- area network
- bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Abstract
The invention discloses an adaptive bandwidth transmitting mechanism suitable for an ultrahigh-speed wireless local area network. The bandwidth can be increased adaptively by a transmitting end through the feedback information of a receiving end, so that the throughput of a system is increased. The scheme can be suitable for single-user and multi-user situations. Through implementation of the technology of the invention, the use efficiency of a system sub-channel can be increased effectively, so that the throughput of a whole network is increased.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate in a kind of novel Wi-Fi (IEEE 802.11ac) standard and improve improving one's methods of throughput of system performance.
Background technology
A new generation Wi-Fi technology IEEE 802.11ac mainly introduces two aspect technical characteristics compared with traditional Wi-Fi, the first, adopt multiuser MIMO (Multi-input Multi-output) technology effective to improve the availability of frequency spectrum of whole system first; The second, introduce bandwidth expansion, bring up to 80MHz from the 20MHz of traditional primary bandwidth, even 160MHz.The introducing of the new technology throughput of system is had very large lifting, but under intensive focus covering scene, the expansion of bandwidth makes the effective rate of utilization of different user occupied bandwidth reduce.The present invention is intended to effective indication problem of the available bandwidth solved in multi-user data transmitting procedure.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides the adaptive bandwidth transmit mechanism being applicable to ultrahigh speed WLAN (wireless local area network), realize transmitting terminal bandwidth self-adaption to be increased or reduce by the feedback information of receiving terminal, thus improving the throughput of system, the program is applicable to the situation of single user and multi-user.
The technical scheme adopted for realizing above-mentioned technical purpose is: the adaptive bandwidth transmit mechanism being applicable to ultrahigh speed WLAN (wireless local area network), current station network allocation vector (Network Allocation Vector, NAV) setting is only arranged main channel, and the feedback of response frame to be every sub-channels all need feedback, therefore website can be arranged by the record every sub-channels all being carried out to NAV, and whether the NAV obtaining this subchannel discharges.
The program is applicable to the situation of single user and multi-user, and concrete steps are as follows:
1. a website (receiving terminal) is in the process of carrying out transfer of data, whether can be carried out the expansion of bandwidth by two condition judgements,
The first, this website need carry out CCA (Clear Channel Assessment) and detect, if CCA Channel Detection is idle condition on the subchannel being about to expansion use;
The second, judge whether the network allocation vector on this subchannel discharges;
If CCA detects the free time and network allocation vector discharges, then show that can expand this subchannel carries out transfer of data, and the information of this subchannel expansion feeds back to transmitting terminal by response frame BA/ACK frame;
2. transmitting terminal can determine the transfer of data of whether carrying out bandwidth expansion at next frame according to the feedback information of website.
The change of frame structure is as follows:
Whether whether utilize " the BA control field " of feedback frame BA frame to indicate current sub-channel can use, the feedback due to BA is the feedback of every sub-channels, therefore the reservation bit position of B3 to B11 in BA control field can be used to indicate current subchannel and can use.
And the use of this reservation bit bit quantity is depending on pointing accuracy, if pointing accuracy is 40MHz subchannel, then use B3-B6 tetra-bits; If pointing accuracy is 80MHz subchannel, then use B3-B4 two bits;
Such as 160M is two 80M or four 40M subchannel, if bit B3-B4, for whether " 00 " then indicates two 80M subchannels unavailable, for " 01 " then indicates second 80MHz subchannel to use, for " 10 " then indicate first 80MHz subchannel to use, for " 11 " then indicate two 80MHz subchannels all available.If use B3-B6 tetra-bits, so work as B3-B6, for " 0000 " then indicates the subchannel of four 40M unavailable, for " 0010 " then indicates the 3rd 40MHz subchannel to use, all the other are unavailable; In these four bits same, display " 1 " then indicates this subchannel to use, otherwise this position then indicates unavailable for " 0 ".
Beneficial effect of the present invention is: compared with existing Wi-Fi technology, the invention has the beneficial effects as follows, as shown in Figure 1, as multiple Basic Service Set (Basic Service Set, when BSS) coexisting, STA3 and STA6 user in existing Wi-Fi technology is owing to being in overlapping BSS region, thus can be subject to the interference of two BSS simultaneously, it is less that the use of its available subchannels becomes, after adopting the technology of the present invention, the user at overlapping BSS place can the situation of real-time testing self available subchannels, thus effectively can improve the service quality of self.Equally, after other websites of BSS adopt the technology of the present invention, also effectively can improve the available bandwidth of self, and then improve the throughput performance of whole system.
Accompanying drawing explanation
To be that existing Wi-Fi technology subchannel is not yet in effect utilize scene schematic diagram to Fig. 1;
Fig. 2 is the reservation bit position utilization power of BA frame structure after amendment;
Fig. 3 is adaptive bandwidth increase schematic flow sheet after improvement Wi-Fi.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, to be that existing Wi-Fi technology subchannel is not yet in effect utilize scene schematic diagram to this figure, is further elaborated by reference to the accompanying drawings to described scheme.
First, AP1 sends to site STA 1, STA2 and STA3 the service condition that RTS frame poll obtains these website available subchannels as shown in Figure 1, existence due to STA4 and STA6 makes STA3 available subchannels quantity reduce, and introduces two kinds of situations here respectively for describing the implementing procedure of the program:
The first situation. when the main channel of AP1 and AP2 work is unjustified, namely main channel is on different frequency bands respectively, AP2 is to site STA 4, time STA5 and STA6 carries out multiuser MIMO, first poll is carried out to these websites, and the result of poll can cause the site STA 3 in STA4 transmission range to be set up NAV, due to the difference of different website available subchannels, by causing, the available subchannels of STA5 with STA6 is different from STA4, then the realization of multiuser MIMO will not add website STA4, the NAV that the subchannel causing STA3 to use at STA4 is arranged cannot remove by this, cause this subchannel cannot efficiency utilization.
The second situation. when the main channel of AP1 and AP2 two BSS is alignd, namely main channel works in identical frequency band, AP2 is to site STA 4, time STA5 and STA6 carries out multiuser MIMO, first poll is carried out to these websites, the result of poll can cause the site STA 3 in STA4 transmission range to be set up network allocation vector, after the transfer of data of AP2 to site STA 4 completes, site STA 3 is still in NAV and arranges state, if adopt the self adaptation increase of bandwidth effectively can improve the service efficiency of bandwidth.
And the service condition of STA3 available subchannels bandwidth can be obtained by method below.
When AP1 carries out multi-user mimo operation to STA1, STA2 and STA3, feed back to transmitting terminal for above situation STA3 by two kinds of methods, specific as follows:
Utilize " BA control " field of feedback frame BA frame whether can use to indicate current sub-channel, feedback due to BA is the feedback of every sub-channels, therefore can by the reservation bit position of B3 to B11 in BA control field, whether be used to indicate current subchannel can use, concrete frame structure amendment as shown in Figure 2.
And the use of this reservation bit bit quantity is depending on pointing accuracy, if pointing accuracy is 40MHz subchannel, then use B3-B6 tetra-bits; If pointing accuracy is 80MHz subchannel, then use B3-B4 two bits;
Such as 160M is two 80M or four 40M subchannel, if bit B3-B4, for whether " 00 " then indicates two 80M subchannels unavailable, for " 01 " then indicates second 80MHz subchannel to use, for " 10 " then indicate first 80MHz subchannel to use, for " 11 " then indicate two 80MHz subchannels all available.If use B3-B6 tetra-bits, so work as B3-B6, for " 0000 " then indicates the subchannel of four 40M unavailable, for " 0010 " then indicates the 3rd 40MHz subchannel to use, all the other are unavailable; In these four bits same, display " 1 " then indicates this subchannel to use, otherwise this position then indicates unavailable for " 0 ".
As shown in Figure 3, in a transmission opportunity (TXOP), AP is to site STA 1, STA2, STA3 sends in the process of data, after each 11ac website adopts technology of the present invention, STA3 can feed back its available bandwidth situation to AP, thus AP can carry out the expansion of subchannel in TXOP transmission opportunity for the available bandwidth of transmission website, thus the efficiency of transmission that can improve in TXOP, obtain and more remain transmission opportunity, and then more reverse transmission capacity can be provided to website.
Claims (3)
1. be applicable to the adaptive bandwidth transmit mechanism of ultrahigh speed WLAN (wireless local area network), it is characterized in that: network allocation vector NAV setting is carried out to main channel and each subsignal, wherein:
Whether step one, a receiving terminal, in the process of carrying out transfer of data, can carry out the expansion of bandwidth by two condition judgements,
The first, this receiving terminal need carry out CCA detection, if CCA Channel Detection is idle condition on the subchannel being about to expansion use;
The second, judge whether the network allocation vector NAV on this subchannel discharges;
If CCA detects the free time and network allocation vector NAV discharges, namely expand this subchannel and carry out transfer of data, and the information expanded by this subchannel feeds back to transmitting terminal by response frame BA/ACK frame;
Step 2, transmitting terminal can determine the transfer of data of whether carrying out bandwidth expansion at next frame according to the feedback information of receiving terminal.
2. be applicable to the adaptive bandwidth transmit mechanism of ultrahigh speed WLAN (wireless local area network) as claimed in claim 1, it is characterized in that: whether the information of described feedback subchannel expansion realizes by changing frame structure, utilize the BA control field of feedback frame BA frame can use to indicate current sub-channel.
3. be applicable to the adaptive bandwidth transmit mechanism of ultrahigh speed WLAN (wireless local area network) as claimed in claim 1, it is characterized in that: the reservation bit position of B3 to B11 in described BA control field, be used to indicate current subchannel and whether can use.
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| US20180199324A1 (en) | 2017-01-09 | 2018-07-12 | Sheng Sun | Methods and systems for transmitting operating channel indicators |
| CN111405574A (en) * | 2020-06-02 | 2020-07-10 | 中国人民解放军国防科技大学 | Broadband wireless communication method, device, equipment and readable storage medium |
| WO2021208795A1 (en) * | 2020-04-17 | 2021-10-21 | 华为技术有限公司 | Channel puncturing mode indication method and related device |
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| CN111405574A (en) * | 2020-06-02 | 2020-07-10 | 中国人民解放军国防科技大学 | Broadband wireless communication method, device, equipment and readable storage medium |
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Application publication date: 20151021 Assignee: Henan Qinhe Technology Co.,Ltd. Assignor: HENAN University OF SCIENCE AND TECHNOLOGY Contract record no.: X2021980002308 Denomination of invention: Adaptive bandwidth transmission mechanism for ultra high speed WLAN Granted publication date: 20180605 License type: Common License Record date: 20210331 |