CN103326844A - Resource distribution method based on 802.11 protocol mixed mode - Google Patents
Resource distribution method based on 802.11 protocol mixed mode Download PDFInfo
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Abstract
The invention relates to a network data transmission technology, in particular to a method for upstream access and resource distribution based on an 802.11 protocol mixed mode. According to the main technical scheme, the method comprises the following steps that the speed type of an access terminal is identified by an access point, the speed type comprises a high speed terminal and a low speed terminal, then according to the speed type of the access terminal, the access point distributes data transmission time or transmission opportunities of the access terminal, and distributes part of transmission time or transmission opportunities of the low speed terminal to the high speed terminal or downstream data transmission of the access point. The resource distribution method based on the 802.11 protocol mixed mode has the advantages that the terminal type is automatically identified, when a terminal STA is connected with an AP, upstream channel access opportunities and TXOP resource distribution time of terminals are controlled on the AP side to ensure fairness of resources, and therefore handling capacity and feeling of terminal users are effectively improved. The resource distribution method based on the 802.11 protocol mixed mode is especially suitable for resource distribution in the mixed mode.
Description
Technical field
The present invention relates to network data transmission technology, relate to a kind of method of distributing based on up access and resource under the 802.11 agreement mixed modes specifically.
Background technology
WLAN is the product that computer network combines with wireless communication technology, uses wireless channel to come access network, for the mobile of communicating by letter provides method.WLAN can be used as the extension of traditional cable network, and WLAN just bringing into play more and more important effect with its high degree of flexibility, mobility, low cost and the transmittability that improves day by day, becomes one of main flow 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 to be up to the data rate of 11Mbps, operate on the ISM band of 2.4GHz, modulation technique adopts complementary code keying (CCK) technology, and the transmission speed of 802.11b can not satisfy the wireless transmission requirement of Large Volume Data, so produced 802.11a and 802.11g.802.11a be operated on the 5GHz frequency range, and adopt OFDM (OFDM) technology, speed reaches 54Mbps, comparing 802.11a with 802.11b is subjected to disturb few, because 802.11a is operated in different frequency ranges with 802.11b, adopt different modulation techniques, so both is incompatible.802.11g adopt the 2.4GHz frequency spectrums of operation; and use OFDM (OFDM) technology, and make transmission rate bring up to 54Mbps, 802.11g has kept the CCK technology that 802.11b adopts; adopted " protection " mechanism simultaneously, made the 802.11g can compatible 802.11b.Because the 802.11g signal can penetrate wall and floor, the distance of comparing 802.11g transmission signal with 802.11a is farther, and therefore, 802.11g both provided the higher network bandwidth, thereby had protected original investment to become the main flow of existing market again.In order to realize high bandwidth, high-quality WLAN service, make WLAN reach the performance level of Ethernet, then produced 802.11n, 802.11n agreement is the two-frequency operation pattern, can be operated in 2.4GHz, can be operated in 5GHz again, and 802.11n combines multiple-input, multiple-output (MIMO) with OFDM (OFDM) technology, not only improved the quality of wireless transmission, also made 802.11n can realize 300Mbps even up to the transmission rate of 600Mbps.In the 802.11n draft, require the 802.11n product under the mixed mode that comprises 802.11a, 802.11g, 802.11b, to move, and have downward compatibility.
Mixed networking, i.e. effective fusion by multiple networking technology improves the network bandwidth, expands the scope that signal covers, thereby allows the user can both obtain the support of bandwidth and multimedia application to greatest extent.But under the scene of mixed networking, for example there are 802.11b, 802.11g and 802.11n in the wireless network standards of commercialization.802.11b can support to be up to the data rate of 11Mbps, the transmission rate of 802.11g is brought up to 54Mbps, and the 802.11n agreement can realize 300Mbps even up to the transmission rate of 600Mbps.In the time of in the middle of these three kinds of patterns are present in mixed networking simultaneously, send identical data volume required time difference, as shown in Figure 1,11n user's instinct sends data in a short period of time and finishes, but the equalization of chance because each terminal access AP(access points), the chance that is the acquisition time resource is identical, cause the 11n mode user need wait for that the long time could send data, wasted too many time resource, make the unreasonable distribution of resource, thereby greatly reduce throughput and user's impression of system.Therefore, we need design a kind of method, under the scene of mixed networking, when terminal STA inserts AP, control up channel access chance and the TXOP resource of each terminal and distribute duration with the fairness of assurance resource, thereby effectively improve throughput and terminal use's impression.
Summary of the invention
Technical problem to be solved by this invention just is based on the present IEEE802.11 agreement, provides a kind of based on 802.11 agreements resource allocation methods in composite mode.
The present invention solves the problems of the technologies described above the technical scheme that adopts: based on 802.11 agreements 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 that accesses terminal, access points distributes the data transmission period or the transmission opportunity that access terminal, the part of low rate terminal transmission duration 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 comprises:
Access points arranges statistical table, and the connection parameter of the terminal that is in connected state that record inserts is two-forty terminal or low rate terminal for identifying to access terminal.
Concrete, described access points distributes the data transmission period or the transmission opportunity that access terminal, comprising:
After the request that access points receives the request time resource that sends of accessing terminal transmits the message control frame, judge that according to the rate class that accesses terminal of identification will allow transmission control frame to send to accesses terminal or access points itself.
Concrete, the described rate class that accesses terminal according to identification judges that will allow transmission control frame to send to accesses terminal or access points itself, comprising:
Judge that access terminal is two-forty terminal or low rate terminal, if the two-forty terminal, then access points directly sends the permission transmission control frame, time resource is distributed to this access terminal and carry out transfer of data;
If low rate terminal, then access points produces a random number, compare with default probability number, if random number is less than the probability number, then access points will allow the address that access points self is revised as in the destination address in the transmission control frame, give access points self with the chance of transfer of data;
If random number is greater than the probability number, then access points is directly distributed to time resource and is accessed terminal, and 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 that accesses terminal according to identification judges that will allow transmission control frame to send to accesses terminal or access points itself, comprising:
Judge that accessing terminal is two-forty terminal or low rate terminal, if the two-forty terminal, then access points directly distributes time resource, carries out transfer of data;
If low rate terminal, then the access points request of obtaining transmits the duration field in the message control frame, duration is shortened according to certain shortening ratio, send the permission transmission control frame again and distribute 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, when terminal STA inserts AP, control up channel access chance and the TXOP resource of each terminal in the AP side and distribute duration with the fairness of assurance resource, thereby improve throughput and terminal use's impression effectively.
Description of drawings
Fig. 1 is each user time resource distribution schematic diagram in the mixed networking pattern;
Fig. 2 forms and the workflow schematic diagram for adopting scene system of the present invention;
Fig. 3 is distribution schematic diagram on the signaling interaction time axle among the 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 effluent journey schematic diagram;
Fig. 9 is embodiment the 2nd AP effluent journey schematic diagram;
Wherein, M represents a numeral producing at random, and P represents a known definite probability number.
Embodiment
At present under the mixed mode scene, because having equal opportunities of low rate terminal and two-forty terminal access channel, caused time resource under a plurality of terminal types and the situation of depositing, the time resource unfair distribution is flat, causes the service quality of two-forty terminal and the decline that the user experiences.So basic thought of the present invention is the donation of introducing TXOP, i.e. transmission duration or the transmission opportunity of a low rate terminal donation part oneself are come out, and give two-forty terminal or AP descending.Specific as follows: when terminal need insert AP, this terminal can send the RTS control frame with the request time resource to AP, and generally AP can send CTS to this terminal and namely allow transmission control frame, and time resource is distributed to this terminal.But, the problems referred to above with regard to our proposition, wish that time resource can more reasonably be utilized, to guarantee the fairness of resource, therefore, the type of AP by identification terminal decides CTS sent to former terminal or sends CTS-to-Self, and time resource is distributed to AP oneself, and soon this ascending time slot is distributed to descending transfer of data.Perhaps, second kind of way is with the duration field in the CTS frame format, reasonably revise, thereby the time resource of control low rate equipment distributes.Thinking according to this allows the low rate terminal be that TXOP contributes a part and comes out to the terminal of two-forty with oneself time resource, thereby has ensured the reasonability that resource is distributed and the overall throughput that has improved the 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, comprise an AP in the scene, three terminal: STA1, STA2 and STA3.Wherein STA1 is low-rate users, and plan sends data to AP, and STA2 and STA3 do not send data.AP to have jurisdiction over and be in the connected state terminal STA and kept a table (as shown in table 1), being used for this terminal of identification still is the low rate terminal for the two-forty terminal.In this Fig. 2 example, AP receives the request that STA1 sends upstream data, and by the identification to STA1, what of terminal access control or resource (duration) distribution selection carry out.
The table 1 high low rate label table that accesses terminal
Concrete signaling control flow as shown in Figures 2 and 3, STA1 prepares to send data to AP, at first send one section request and transmit message RTS (Request to Send, RTS control frame form is as shown in Figure 4) because RTS is strong modulation, so 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 among the RTS (RTS control frame form as shown in Figure 4), thereby reduce the generation of collision.AP can be by the type of table 1 judgement STA1 after receiving the RTS frame, select corresponding decision-making that time resource is distributed back (concrete decision process is described at the 3rd joint), send permission according to specific strategy and send message CTS (Clear to Send, CTS control frame form are as shown in Figure 5).Because the CTS frame also is strong modulation, STA1, STA2 and STA3 can receive.If AP selects time resource is distributed to AP oneself, STA1 then, STA2 and STA3 can be according to the NAV values of the duration field modification oneself of CTS, and AP carries out downlink data transmission.If AP selects time resource is distributed to STA1, then STA2 and STA3 can revise the NAV value of oneself according to the duration field of CTS, STA1 is by resolving duration field in the CTS frame and obtain time resource and to AP transmission data, wherein the Frame frame format as shown in Figure 6, the ACK frame format is as shown in Figure 7.
The handling process of AP side: receive the RTS of STA1 transmission as AP after, have this moment two kinds of methods to select for AP.
Method one is as shown in Figure 8:
After AP receives the RTS control frame that STA1 sends, according to the height rate identification table 1 that AP side is in advance set up, 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 carry out transfer of data.
If STA1 is low-rate users, then AP can produce a random number between (0,1), compare with the probability P of determining, as: P=1/3.
If random number is less than this probability, then AP can revise RA and the duration field in the CTS control frame, with the address that the destination address in the CTS control frame (RA) is revised as AP, gives AP oneself with the chance of transfer of data, namely changes downlink transfer into.
If random number is greater than this probability, then AP directly distributes to time resource terminal STA 1, carries out transfer of data.
Second solution be as shown in Figure 9:
After AP receives the RTS control frame that STA1 sends, according to the height rate identification table 1 that AP side is in advance set up, 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 AP at first obtains the duration field in the RTS control frame, obtain the duration field after, the duration of AP K according to a certain percentage shortens, 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 (8)
1. based on 802.11 agreements 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 that accesses terminal, access points distributes the data transmission period or the transmission opportunity that access terminal, the part of low rate terminal transmission duration or transmission opportunity is distributed to the downlink data transmission of two-forty terminal or access points.
2. according to claim 1ly it is characterized in that based on 802.11 agreements resource allocation methods in composite mode that the rate class that described access points identification accesses terminal comprises:
Access points arranges statistical table, and the connection parameter of the terminal that is in connected state that record inserts is two-forty terminal or low rate terminal for identifying to access terminal.
3. according to claim 1 and 2ly it is characterized in that based on 802.11 agreements resource allocation methods in composite mode described access points distributes the data transmission period or the transmission opportunity that access terminal, comprising:
After the request that access points receives the request time resource that sends of accessing terminal transmits the message control frame, judge that according to the rate class that accesses terminal of identification will allow transmission control frame to send to accesses terminal or access points itself.
4. according to claim 3 based on 802.11 agreements resource allocation methods in composite mode, it is characterized in that, the described rate class that accesses terminal according to identification judges that will allow transmission control frame to send to accesses terminal or access points itself, comprising:
Judge that access terminal is two-forty terminal or low rate terminal, if the two-forty terminal, then access points directly sends the permission transmission control frame, time resource is distributed to this access terminal and carry out transfer of data;
If low rate terminal, then access points produces a random number, compare with default probability number, if random number is less than the probability number, then access points will allow the address that access points self is revised as in the destination address in the transmission control frame, give access points self with the chance of transfer of data;
If random number is greater than the probability number, then access points is directly distributed to time resource and is accessed terminal, and carries out transfer of data.
5. according to claim 4ly it is characterized in that based on 802.11 agreements resource allocation methods in composite mode described random number is the random number between 0～1.
6. according to claim 5ly it is characterized in that based on 802.11 agreements resource allocation methods in composite mode described probability number is 1/3.
7. according to claim 3 based on 802.11 agreements resource allocation methods in composite mode, it is characterized in that, the described rate class that accesses terminal according to identification judges that will allow transmission control frame to send to accesses terminal or access points itself, comprising:
Judge that accessing terminal is two-forty terminal or low rate terminal, if the two-forty terminal, then access points directly distributes time resource, carries out transfer of data;
If low rate terminal, then the access points request of obtaining transmits the duration field in the message control frame, duration is shortened according to certain shortening ratio, send the permission transmission control frame again and distribute time resource to accessing terminal, carry out transfer of data to allow to access terminal.
8. according to claim 7ly it is characterized in that based on 802.11 agreements resource allocation methods in composite mode described shortening ratio is 1/6.
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| CN110324901A (en) * | 2018-03-30 | 2019-10-11 | 华为技术有限公司 | Cascade communication means, wireless access point and the storage medium of AP |
| CN110856198A (en) * | 2019-11-27 | 2020-02-28 | 太仓市同维电子有限公司 | Method for improving wireless performance of router during weak signal user access |
| CN112445622A (en) * | 2020-12-14 | 2021-03-05 | 招商局金融科技有限公司 | Terminal data transmission method, device, equipment and medium based on gateway box |
| CN113692050A (en) * | 2021-07-21 | 2021-11-23 | 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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| CN112445622A (en) * | 2020-12-14 | 2021-03-05 | 招商局金融科技有限公司 | Terminal data transmission method, device, equipment and medium based on gateway box |
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| CN113692050A (en) * | 2021-07-21 | 2021-11-23 | 深圳市联洲国际技术有限公司 | Resource unit allocation method, device, equipment and medium |
| 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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