CN103326844B - Based on 802.11 agreement resource allocation methods in composite mode - Google Patents
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Abstract
The present invention relates to network data transmission technology, relate to a kind of method based on multi-upstream access and Resourse Distribute under 802.11 agreement mixed modes specifically.Method main technical schemes of the present invention is: the rate class accessed terminal by access points identification, described rate class comprises two-forty terminal and low rate terminal, then according to the rate class accessed terminal, access points distributes the data transmission period accessed terminal or transmission opportunity, the fractional transmission duration of low rate terminal or transmission opportunity is distributed to the downlink data transmission of two-forty terminal or access points.Beneficial effect of the present invention is, by automatic identification terminal type, during terminal STA access AP, control the up channel access chance of each terminal and TXOP Resourse Distribute duration in AP side to ensure the fairness of resource, thus raising throughput and the impression of terminal use effectively.The present invention is particularly useful for resource allocation methods in composite mode.
Description
Technical field
The present invention relates to network data transmission technology, relate to a kind of method based on multi-upstream access and Resourse Distribute under 802.11 agreement mixed modes specifically.
Background technology
WLAN is the product that computer network combines with wireless communication technology, uses wireless channel to carry out access network, for the mobile of communication provides method.WLAN can as the extension of conventional wired networks, and WLAN just plays more and more important effect with its high degree of flexibility, mobility, low cost and the transmittability that day by day improves, becomes one of dominant form of future network development.
At present, the wireless network standards of commercialization mainly contains 4 kinds, i.e. 802.11n, 802.11a, 802.11g, 802.11b.802.11b can support the data rate being up to 11Mbps, operate in the ISM band of 2.4GHz, modulation technique adopts complementary code keying (CCK) technology, the transmission speed of 802.11b can not meet the wireless transmission requirement of Large Volume Data, so create 802.11a and 802.11g.802.11a be operated in 5GHz frequency range, and adopt OFDM (OFDM) technology, speed reaches 54Mbps, 802.11a is disturbed few compared with 802.11b, because 802.11a and 802.11b is operated in different frequency ranges, adopt different modulation techniques, therefore both are incompatible.802.11g adopt 2.4GHz frequency spectrums of operation; and use OFDM (OFDM) technology, make transmission rate bring up to 54Mbps, 802.11g remains the CCK technology that 802.11b adopts; have employed one " protection " mechanism simultaneously, enable the compatible 802.11b of 802.11g.Because 802.11g signal can penetrate wall and floor, the distance of 802.11g transmission signal is farther compared with 802.11a, and therefore, 802.11g had both provided the higher network bandwidth, protects again original investment thus becomes the main flow of existing market.In order to realize high bandwidth, high-quality WLAN serves, WLAN is made to reach the performance level of Ethernet, then create 802.11n, 802.11n agreement is two-frequency operation pattern, can be operated in 2.4GHz, can 5GHz be operated in again, and multiple-input, multiple-output (MIMO) combine with OFDM (OFDM) technology by 802.11n, not only increase the quality of wireless transmission, also make 802.11n can realize 300Mbps even up to the transmission rate of 600Mbps.In 802.11n draft, require that 802.11n product can run under the mixed mode comprising 802.11a, 802.11g, 802.11b, and there is downward compatibility.
Mixed networking, namely by the effective integration of multiple networking technology, improves the network bandwidth, expands the scope of quorum sensing inhibitor, thus allow user can obtain the support of bandwidth sum multimedia application to greatest extent.But under the scene of mixed networking, such as, there is 802.11b, 802.11g and the 802.11n in the wireless network standards of commercialization.802.11b can support the data rate being up to 11Mbps, and the transmission rate of 802.11g brings up to 54Mbps, and 802.11n agreement can realize 300Mbps even up to the transmission rate of 600Mbps.When this Three models is present in the middle of mixed networking simultaneously, send identical data volume required time different, as shown in Figure 1, data are sent by 11n user's instinct in a short period of time, but due to each terminal access AP(access points) the equalization of chance, namely the chance of acquisition time resource is identical, the longer time could send data to cause 11n mode user to wait for, waste too many time resource, make the unreasonable distribution of resource, thus greatly reduce throughput and user's impression of system.Therefore, we need to design a kind of method, under the scene of mixed networking, during terminal STA access AP, control the up channel access chance of each terminal and TXOP Resourse Distribute duration to ensure the fairness of resource, thus effectively raising throughput and end-user experience.
Summary of the invention
Technical problem to be solved by this invention is exactly based on current IEEE802.11 agreement, provides a kind of based on 802.11 agreement resource allocation methods in composite mode.
The present invention solves the problems of the technologies described above adopted technical scheme: based on 802.11 agreement resource allocation methods in composite mode, it is characterized in that, comprising:
The rate class that access points identification accesses terminal, described rate class comprises two-forty terminal and low rate terminal;
According to the rate class accessed terminal, access points distributes the data transmission period accessed terminal or transmission opportunity, the fractional transmission duration of low rate terminal or transmission opportunity is distributed to the downlink data transmission of two-forty terminal or access points.
Concrete, the rate class that described access points identification accesses terminal, comprising:
Access points arranges statistical table, the Connecting quantity being in the terminal of connected state of record access, accesses terminal as two-forty terminal or low rate terminal for identifying.
Concrete, described access points distributes the data transmission period accessed terminal or transmission opportunity, comprising:
After access points receives the request transmission message control frame of the request time resource sent that accesses terminal, the rate class accessed terminal according to identifying judges permission transmission control frame to send to access terminal or access points itself.
Concrete, the described rate class accessed terminal according to identifying judges permission transmission control frame to send to access terminal or access points itself, comprising:
Judge that to access terminal be two-forty terminal or low rate terminal, if two-forty terminal, then access points directly sends permission transmission control frame, time resource is distributed to this and accesses terminal and carry out transfer of data;
If low rate terminal, then access points produces a random number, compare with the probability number preset, if random number is less than probability number, then the address of access points self is revised as in the destination address allowed in transmission control frame by access points, by the chance of transfer of data to access points self;
If random number is greater than probability number, then time resource is directly distributed to and is accessed terminal by access points, carries out transfer of data.
Concrete, described random number is the random number between 0 ~ 1.
Concrete, described probability number is 1/3.
Concrete, the described rate class accessed terminal according to identifying judges permission transmission control frame to send to access terminal or access points itself, comprising:
Judge that accessing terminal is two-forty terminal or low rate terminal, if two-forty terminal, then access points directly distributes time resource, carries out transfer of data;
If low rate terminal, then access points obtains the duration field in request transmission message control frame, duration is shortened according to certain shortening ratio, then sends permission transmission control frame distribution time resource to accessing terminal, carry out transfer of data to allow to access terminal.
Concrete, described shortening ratio is 1/6.
Beneficial effect of the present invention is, by automatic identification terminal type, during terminal STA access AP, control the up channel access chance of each terminal and TXOP Resourse Distribute duration in AP side to ensure the fairness of resource, thus raising throughput and the impression of terminal use effectively.
Accompanying drawing explanation
Fig. 1 is each user time resource distribution schematic diagram in mixed networking pattern;
Fig. 2 is for adopting scene system of the present invention composition and workflow schematic diagram;
Fig. 3 is distribution schematic diagram on signaling interaction time axle in embodiment;
Fig. 4 is RTS frame format schematic diagram;
Fig. 5 is CTS frame format schematic diagram;
Fig. 6 is Frame frame format schematic diagram;
Fig. 7 is ACK frame frame format schematic diagram;
Fig. 8 is embodiment the one AP side schematic flow sheet;
Fig. 9 is embodiment the 2nd AP side schematic flow sheet;
Wherein, M represents the random numeral produced, and P represents a known probability number determined.
Embodiment
At present under mixed mode scene, because low rate terminal and two-forty terminal access having equal opportunities of channel, cause time resource at multiple terminal type and deposit, time resource unfair distribution is put down, and causes the service quality of two-forty terminal and the decline of Consumer's Experience.So basic thought of the present invention introduces the donation of TXOP, namely low rate terminal contributes the transmission duration of a part oneself or transmission opportunity out, to two-forty terminal or AP descending.Specific as follows: when there being terminal to need access AP, this terminal can send RTS control frame with request time resource to AP, AP can send CTS to this terminal and namely allow transmission control frame under normal circumstances, time resource is distributed to this terminal.But, with regard to the problems referred to above that we propose, wish that time resource can more reasonably be utilized, to ensure the fairness of resource, therefore, AP decides CTS sent to former terminal or send CTS-to-Self by the type of identification terminal, time resource is distributed to AP oneself, distributes to descending transfer of data by this ascending time slot.Or the second way is by the duration field in CTS frame format, reasonably revises, thus the time resource controlling low rate equipment distributes.Thinking according to this, allows low rate terminal that the time resource of oneself and TXOP are contributed a part out to the terminal of two-forty, thus has ensured the reasonability of Resourse Distribute and improve the overall throughput of mixed networking scene.
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail:
Embodiment:
As shown in Figure 2, scene comprises an AP, three terminals: STA1, STA2 and STA3.Wherein STA1 is low-rate users, plans to send data to AP, STA2 and STA3 does not send data.AP remains a table (as shown in table 1) to the administrative connected state terminal STA that is in, for identifying that this terminal is two-forty terminal or low rate terminal.In this Fig. 2 example, AP receives STA1 and sends the request of upstream data, and by the identification to STA1, select to carry out terminal access control or resource (duration) distribute number.
Table 1 accesses terminal high low rate label table
Concrete signaling control flow as shown in Figures 2 and 3, STA1 prepares to send data to AP, first send one section of request and transmit message RTS (RequesttoSend, RTS control frame form is as shown in Figure 4) because RTS is strong modulation, therefore AP, STA2 and STA3 can receive the RTS that STA1 sends, wherein, STA2 and STA3 can revise the NAV of oneself according to the duration field (RTS control frame form as shown in Figure 4) in RTS, thus reduces the generation of collision.The type of STA1 can be judged by table 1 after AP receives RTS frame, corresponding decision-making is selected to carry out distribution rear (concrete decision process describes in Section 3) to time resource, send according to specific strategy and allow to send message CTS (CleartoSend, CTS control frame form as shown in Figure 5).Because CTS frame is also strong modulation, STA1, STA2 and STA3 can receive.If AP selects time resource to distribute to AP oneself, then STA1, STA2 and STA3 can according to the NAV values of the duration field amendment of CTS oneself, and AP carries out downlink data transmission.If AP selects time resource to distribute to STA1, then STA2 and STA3 can according to the NAV value of the duration field amendment of CTS oneself, STA1 obtains time resource by the duration field of resolving in CTS frame and transmits data to AP, and wherein Frame frame format as shown in Figure 6, and ACK frame format as shown in Figure 7.
The handling process of AP side: after AP receives the RTS of STA1 transmission, now has two kinds of methods can select for AP.
Method one is as shown in Figure 8:
After AP receives the RTS control frame of a STA1 transmission, according to the height rate identification table 1 of AP side foundation in advance, judge that STA1 is high or low rate users.
If STA1 is high rate user, then AP directly sends a CTS control frame, time resource is distributed to this terminal and carries out transfer of data.
If STA1 is low-rate users, then AP can produce the random number between (0,1), compares with the probability P determined, as: P=1/3.
If random number is less than this probability, then AP can revise RA in CTS control frame and duration field, the destination address (RA) in CTS control frame is revised as the address of AP, by the chance of transfer of data to AP oneself, namely changes downlink transfer into.
If random number is greater than this probability, then time resource is directly distributed to terminal STA 1 by AP, carries out transfer of data.
Second solution be as shown in Figure 9:
After AP receives the RTS control frame of STA1 transmission, according to the height rate identification table 1 of AP side foundation in advance, judge that STA1 is high or low rate users.
If STA1 is high rate user, then AP directly distributes time resource, carries out transfer of data.
If STA1 is low-rate users, then first AP obtains the duration field in RTS control frame, after obtaining duration field, AP to duration according to a certain percentage K shorten, as: shorten to original 1/6, K=1/6, send CTS again and distribute time resource to terminal, carry out transfer of data to allow terminal.
Claims (4)
1., based on 802.11 agreement resource allocation methods in composite mode, it is characterized in that, comprising:
The rate class that access points identification accesses terminal, described rate class comprises two-forty terminal and low rate terminal;
According to the rate class accessed terminal, access points distributes the data transmission period accessed terminal or transmission opportunity, the fractional transmission duration of low rate terminal or transmission opportunity are distributed to the downlink data transmission of two-forty terminal or access points, described access points distributes the data transmission period accessed terminal or transmission opportunity, comprising:
After access points receives the request transmission message control frame of the request time resource sent that accesses terminal, the rate class accessed terminal according to identifying judges permission transmission control frame to send to access terminal or access points itself, and concrete grammar comprises:
Judge that to access terminal be two-forty terminal or low rate terminal, if two-forty terminal, then access points directly sends permission transmission control frame, time resource is distributed to this and accesses terminal and carry out transfer of data;
If low rate terminal, then access points produces a random number, compare with the probability number preset, if random number is less than probability number, then the address of access points self is revised as in the destination address allowed in transmission control frame by access points, by the chance of transfer of data to access points self;
If random number is greater than probability number, then time resource is directly distributed to and is accessed terminal by access points, carries out transfer of data.
2. according to claim 1ly it is characterized in that based on 802.11 agreement resource allocation methods in composite mode, the rate class that described access points identification accesses terminal, comprising:
Access points arranges statistical table, the Connecting quantity being in the terminal of connected state of record access, accesses terminal as two-forty terminal or low rate terminal for identifying.
3. according to claim 1ly it is characterized in that based on 802.11 agreement resource allocation methods in composite mode, described random number is the random number between 0 ~ 1.
4. according to claim 3ly it is characterized in that based on 802.11 agreement resource allocation methods in composite mode, described probability number is 1/3.
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| CN103974378B (en) * | 2014-05-16 | 2017-09-05 | 西安电子科技大学 | Low-rate users connection control method based on QoS guarantee and competition window |
| CN105025552B (en) * | 2014-05-20 | 2018-12-28 | 魅族科技（中国）有限公司 | A kind of wireless communications method, relevant device and system |
| CN105792247B (en) * | 2014-12-25 | 2019-12-13 | 中国移动通信集团公司 | data pushing method and device |
| US9838893B2 (en) * | 2015-06-25 | 2017-12-05 | Alcatel Lucent | System and method for cooperatively controlling an application |
| CN106788673B (en) * | 2016-11-29 | 2019-11-08 | 上海卫星工程研究所 | Spaceborne engineering parameter rapid transmission method based on data fusion |
| CN108541026A (en) * | 2018-03-28 | 2018-09-14 | 烽火通信科技股份有限公司 | Method and system when according to STA negotiated speed reasonable distribution skies |
| CN110324901B (en) * | 2018-03-30 | 2022-03-29 | 华为技术有限公司 | Communication method of cascaded APs, wireless access point and storage medium |
| CN110856198B (en) * | 2019-11-27 | 2021-08-17 | 太仓市同维电子有限公司 | Method for improving wireless performance of router during weak signal user access |
| CN112445622B (en) * | 2020-12-14 | 2024-02-13 | 招商局金融科技有限公司 | Terminal data transmission method, device, equipment and medium based on gateway box |
| CN113692050B (en) * | 2021-07-21 | 2024-03-29 | 深圳市联洲国际技术有限公司 | Resource unit allocation method, device, equipment and medium |
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