CN101695181A - Data sending device of wireless local network, method and wireless access point device - Google Patents
Data sending device of wireless local network, method and wireless access point device Download PDFInfo
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Abstract
The invention relates to a data sending device of a wireless local network, a method and a wireless access point device. The sending device comprises a frame sending unit, a rate acquisition unit, a aggregate depth setting unit, an aggregate unit, wherein the frame sending unit is used for setting linking rate of a client side and sending an aggregate frame to the client side according to the set linking rate; the rate acquisition unit is used for acquiring the linking rate of the client side from the frame sending unit; the aggregate depth setting unit is used for setting aggregate depth according to the linking rate; the aggregate depth is frame length of the aggregate frame aggregated by data frames to be sent; the destination of the data to be sent is the client side; and the aggregate unit is used for aggregating the data frames to be sent into aggregate frame with the frame length of being aggregate depth and sending by the frame sending unit. The invention sets the aggregate depth by acquiring the linking rate of the client side according to the linking rate of the client side and realizes the fairness of the client side to the occupying of transmission time.
Description
Technical field
The present invention relates to the wireless local area network technology field, relate in particular to a kind of data sending device of WLAN (wireless local area network) and method, wireless access point apparatus.
Background technology
WLAN (wireless local area network) (Wireless Local Area Network, WLAN) be the computer local network of making transmission medium with wireless channel, adopt wireless mode that the function of traditional cable LAN is provided, can make the user real realize at any time, everywhere, random broadband network inserts.
WLAN agreement 802.11n is formulated and issue by Institute of Electrical and Electronics Engineers (IEEE), and this agreement has been taked higher transmission rate.
WLAN agreement 802.11n realizes that more a kind of method of high transfer rate is that (Multiple-Input Multiple-Output, MIMO) technology significantly improve wireless link speed to 300Mbps in the employing multiple-input, multiple-output.Compare with former generation WLAN agreement 802.11g technology, link speed has improved 5 times.Except that the highest link speed, WLAN agreement 802.11n has also stipulated other speed such as 13Mbps, 26Mbps, 104Mbps, can select suitable link speed according to the signal quality of client, to reach transmission stably.
WLAN agreement 802.11n realizes that the more another kind of method of high transfer rate adopts the frame aggregation method.The frame aggregation method is transmitted by a plurality of short packets are aggregated into 1 long packet, also is about to data in a plurality of normal data frame and merges into the data in the frame and transmit, and to reduce transport overhead, improves transmission rate.Wherein, the frame at the data place after the merging is an aggregate frame.
Figure 1A is the frame format schematic diagram of normal data frame, and Figure 1B is the schematic diagram of normal data frame transmission.Shown in Figure 1A, normal data frame comprises frame head (Header), data (Data) and three parts of Frame Check Sequence (FCS).Frame head provides decoding more necessary parameters for receiver, and Frame Check Sequence provides foundation for whether receiver verification msg frame error code takes place in transmission course.Shown in Figure 1B, in the transmission course, behind each frame (Frame) end of transmission, receive if receiving terminal is correct, can send an acknowledgement frame (ACK); In addition, between each frame must be arranged certain blanking time, be frame gap this blanking time.Frame head, Frame Check Sequence, acknowledgement frame, frame gap are not born the transmission of valid data, all belong to transport overhead.
Because transport overhead has taken even than the more channel time of valid data, cause effective transmission rate very low, thereby, transmitting terminal comes out the data pick-up in several normal data frame, condense together, give new frame head and Frame Check Sequence, form the aggregate frame shown in Fig. 2 A.Each subframe (SubFrame) in the aggregate frame: subframe 1, subframe 2 ..., subframe N is the data in original each normal data frame.Fig. 2 B is the schematic diagram of aggregate frame transmission, adopts the frame aggregation method with the synthetic aggregate frame transmission of a plurality of short frames, has reduced transport overhead.For WLAN agreement 802.11n, can improve 3～4 times effective transmission speed.
Wherein, the length of aggregate frame is the polymerization degree of depth, is unit with the byte.The maximum polymerization degree of depth of aggregate frame is restricted by 2 factors: the sub-frame number in the aggregate frame can not surpass 64, and the frame length of aggregate frame can not surpass 65536 bytes.In the practical application, the polymerization degree of depth is subject to the size of frame buffer zone, is generally less than the maximum polymerization degree of depth.
In the prior art, when adopting the frame aggregation method to send data, transmitting terminal is that the data sending device of WLAN is taked unified frame aggregation strategy, and promptly high speed client (client) has the identical polymerization degree of depth with the low speed client.According to above-mentioned frame aggregation strategy, the frame length that mails to high speed client and low speed client is identical.Wherein, the data sending device of WLAN comprises frame buffer zone, frame aggregation unit and frame transmitting element.Frame buffer zone is used for buffer memory Frame to be sent, and sequentially Frame to be sent is sent to the frame aggregation unit; The frame aggregation unit sends to the frame transmitting element after Frame is polymerized to aggregate frame; The frame transmitting element is encoded, after modulation etc. handles, is sent to client aggregate frame.In addition, the link speed of client is set according to actual conditions by the frame transmitting element, and adopts the link speed of setting when sending aggregate frame.
The defective that prior art exists is: because the link speed of each client there are differences, thereby prior art is not distinguished the link speed of client, take unified frame aggregation strategy, promptly adopt the identical polymerization degree of depth, in the more transmission times of frame needs that cause the low speed client, influenced the fairness of channel occupancy.As shown in Figure 3, have the transmission schematic diagram of two clients in the network, the speed of first client is lower, has only 13Mbps, and the second client speed is higher, reaches 130Mbps.To the Frame of the two transmission equal length, the time that first client is spent will be longer than second client far away.Though weigh from the quantity of transmission frame, first client and second client equate, but because first client has taken the too much transmission time, caused the inequality in second client person's transmission time, cause the two-forty performance of second client not come out, also influenced the performance of whole network.Like this, when the client of multiple speed coexists, just need to propose a kind of technical scheme and realize the fairness that each client took the transmission time.
Summary of the invention
The present invention proposes a kind of data sending device of WLAN (wireless local area network) and method, wireless access point apparatus, with the fairness that realizes that client took the transmission time.
The invention provides a kind of data sending device of WLAN (wireless local area network), comprising:
The frame transmitting element is used to set the link speed of client, and sends aggregate frame according to the link speed of setting to described client;
The speed collecting unit is used for gathering from described frame transmitting element the link speed of described client;
The polymerization depth setting unit is used for according to the described link rate setting polymerization degree of depth; The described polymerization degree of depth is the frame length that Frame to be sent is polymerized to aggregate frame; The destination of described data to be sent is described client;
Polymerized unit is used for described Frame to be sent is polymerized to the aggregate frame that frame length is the described polymerization degree of depth, is sent by described frame transmitting element.
The present invention also provides a kind of data transmission method for uplink of WLAN (wireless local area network), comprising:
Gather the link speed of client;
According to the described link rate setting polymerization degree of depth; The described polymerization degree of depth is the frame length that Frame to be sent is polymerized to aggregate frame; The destination of described data to be sent is described client;
Described Frame to be sent is polymerized to the aggregate frame that frame length is the described polymerization degree of depth, sends.
The present invention also provides a kind of wireless access point apparatus, comprises the data sending device of above-mentioned WLAN (wireless local area network).
The technical scheme that the foregoing description provides is by gathering the link speed of client, and according to the link rate setting polymerization degree of depth of client, can provide frame aggregation for the low rate client than low depth, for the two-forty client provides frame aggregation than high depth, thereby in the transmission time that makes two-forty client and low rate client enjoy basically identical, realized the fairness that client took the transmission time.And each client is to the fairness that the transmission time takies, and when making the transmission rate of low rate client slightly reduce, the transmission rate of two-forty client is largely increased, thereby has promoted the transmission performance of whole network.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Figure 1A is the frame format schematic diagram of normal data frame;
Figure 1B is the schematic diagram of normal data frame transmission;
Fig. 2 A is the frame format schematic diagram of aggregate frame;
Fig. 2 B is the schematic diagram of aggregate frame transmission holding time;
Fig. 3 is the frame transmission schematic diagram of two clients in the prior art;
The structural representation of the data sending device of a kind of WLAN (wireless local area network) that Fig. 4 provides for the embodiment of the invention;
The schematic diagram of shared time during the data sending device transmission data of the WLAN (wireless local area network) that Fig. 5 provides for the embodiment of the invention;
The structural representation of the data sending device of the another kind of WLAN (wireless local area network) that Fig. 6 provides for the embodiment of the invention;
The flow chart of the data transmission method for uplink of the WLAN (wireless local area network) that Fig. 7 provides for the embodiment of the invention;
The structural representation of the wireless access point apparatus that Fig. 8 provides for the embodiment of the invention.
Embodiment
The structural representation of the data sending device of a kind of WLAN (wireless local area network) that Fig. 4 provides for the embodiment of the invention.This dispensing device comprises: frame transmitting element 41, speed collecting unit 42, polymerization depth setting unit 43 and polymerized unit 44.Frame transmitting element 41 is used to set the link speed of client, and sends aggregate frame according to the link speed of setting to described client.Speed collecting unit 42 is used for gathering from the frame transmitting element link speed of described client.Polymerization depth setting unit 43 is used for according to the described link rate setting polymerization degree of depth.For example, set the polymerization degree of depth than low depth for the less speed of value; For the bigger speed of value, set the polymerization degree of depth than high depth.The described polymerization degree of depth is the frame length that Frame to be sent is polymerized to aggregate frame.When the degree of depth was low, the frame length of aggregate frame was less; When the degree of depth was higher, the frame length of aggregate frame was bigger.The destination of described data to be sent is described client.Polymerized unit 44 is used for described Frame to be sent is polymerized to the aggregate frame that frame length is the described polymerization degree of depth, is sent by described frame transmitting element 41.Wherein, speed collecting unit 42 can be by the link speed of preset period from frame transmitting element 41 clients.
The data sending device of the WLAN (wireless local area network) that the embodiment of the invention provides also can comprise: speed averaging unit 45.This speed averaging unit 45 is used for the link speed of gathering is averaged, and stablizes to guarantee the speed that offers polymerization depth setting unit 43 as far as possible.At this moment, described polymerization depth setting unit 43 is used for setting the polymerization degree of depth according to described mean value.
The data sending device of the WLAN (wireless local area network) that the embodiment of the invention provides also can comprise: speed is rejected unit 46.Speed reject that unit 46 is used for rejecting the link speed of collection and the mean value difference maximum that links speed of gathering link speed, stable as far as possible with the speed that guarantees to offer polymerization depth setting unit 43; At this moment, described polymerization depth setting unit 43 is used for linking the rate setting polymerization degree of depth according to linking of the mean value difference maximum that links speed of rejecting described and collection after the speed.
In the present embodiment, the data sending device of WLAN (wireless local area network) is by polymerization depth setting unit 43, the link rate setting polymerization degree of depth according to client, for the low rate client provides frame aggregation than low depth, for the two-forty client provides frame aggregation than high depth, thus the transmission time that makes two-forty client and low rate client enjoy basically identical.Scene with two different rates clients is an example, the link speed of second client is far above first client, by adopting the data sending device of the WLAN (wireless local area network) that present embodiment provides, for the high speed client is provided with the high polymerization degree of depth, for the low speed client is provided with the low polymerization degree of depth, normal data frame is through after the polymerization, and the frame length that second client is transmitted will be much larger than first client, transmit the shared time as shown in Figure 5, the transmission time of two clients equates basically.Also be about to original part-time for the low rate client transmissions and offer the two-forty client, make the transmission rate of low rate client slightly reduce, the transmission rate of two-forty client significantly improves simultaneously, thereby has promoted the transmission performance of whole network.
The structural representation of the data sending device of the another kind of WLAN (wireless local area network) that Fig. 6 provides for the embodiment of the invention.The data sending device that present embodiment provides improves by the data sending device to existing 802.11n WLAN (wireless local area network) and obtains.The data sending device that present embodiment provides comprises frame buffer zone 61, frame aggregation unit 62, frame transmitting element 63, speed collecting unit 64 and polymerization depth setting unit 65.Wherein, frame buffer zone 61 and frame transmitting element 63 are existing functional unit in the data sending device of existing 802.11n WLAN (wireless local area network), and frame aggregation unit 62, speed collecting unit 64 obtain by the improvement to the frame aggregation unit in the data sending device of existing 802.11n WLAN (wireless local area network), client speed collecting unit respectively.Polymerization depth setting unit 65 is newly-increased unit, specifically sees the explanation of middle polymerization depth setting unit 43 embodiment illustrated in fig. 4 for details.
Data to be sent are assembled into the Frame of 802.11 forms, when the data sending device that provides by present embodiment sends, at first are placed into buffer memory in the frame buffer zone 61.Several Frames that mail to same client enter frame aggregation unit 62 according to sequencing from frame buffer zone 61.Enter above-mentioned several Frames of frame aggregation unit 62,, form an aggregate frame, enter frame transmitting element 63 through frame aggregation unit 62 polymerizations.After 63 pairs of aggregate frame of frame transmitting element are encoded, modulation etc. handled, mail to the client in the 802.11n wireless network.Speed collecting unit 64 and polymerization depth setting unit 65 are as information gathering and polymerization degree of depth control module, the transmission of auxiliary data frame.
During first aggregate frame of frame aggregation unit 62 polymerizations, still take unified frame aggregation strategy to carry out polymerization, speed collecting unit 64 and polymerization depth setting unit 65 are not carried out any operation.When frame transmitting element 63 sent first aggregate frame, speed collecting unit 64 was gathered the link speed of relative client, and sends to polymerization depth setting unit 65, to set the corresponding polymerization degree of depth.
The speed averaging unit 45 and the speed that also can be provided with in the speed collecting unit 64 in embodiment illustrated in fig. 4 are rejected the functional module of unit 46, the link speed of the client of gathering repeatedly gathered ask for the Mean Speed value, reject obviously unusual processing such as rate value, frequently change with the speed that prevents to gather, guarantee that the speed of gathering is stable as far as possible.
Speed after the processing offers polymerization depth setting unit 65 and sets the polymerization degree of depth.Polymerization depth setting unit 65 by certain algorithm, calculates the polymerization degree of depth of each speed client correspondence according to the link speed set of client, sets up " speed-polymerization degree of depth " corresponding relation.
Suppose to exist in the 802.11n network client of n kind different rates, speed is respectively V1, V2......Vn, and wherein the flank speed value is Vmax.If the frame head time is Th, generally speaking, mail to the frame of different rates client, its frame head time is identical.If the maximum polymerization degree of depth that frame aggregation unit 62 is supported is Dmax.
The polymerization degree of depth of Vmax correspondence is set to Dmax, and then speed is the frame transmission time of the client of Vmax to be:
T＝Th+Dmax/Vmax (1)
The polymerization degree of depth of Vn correspondence is set to Dn, and then speed is the frame transmission time of the client of Vn to be: Th+Dn/Vn.
Guarantee the fair busy channel transmission time of each speed client, also promptly will guarantee the time T h+Dn/Vn=T of each client busy channel transmission, then can obtain:
Th+Dn/Vn＝Th+Dmax/Vmax (2)
Dn＝Dmax×Vn/Vmax (3)
When polymerization depth setting unit 65 receives the rate value of speed collecting unit 64 transmissions, just can obtain the corresponding polymerization degree of depth according to above-mentioned formula (3).
Suppose V1=10, V2=1, the frame head time is Th=1, and the maximum polymerization degree of depth that frame aggregation unit 62 is supported is Dmax=100, and client C1 and client C2 alternate transmission are ignored frame gap and other expense herein.
If according to prior art, client C1, client C2 all adopt maximum polymerization depth D max, and then the transmission time of each frame of client C1 is:
T1＝Th+Dmax/V1；
The transmission time of each frame of client C2 is:
T2＝Th+Dmax/V2。
Then the effective transmission speed of client C1 is:
Vc1＝Dmax/(T1+T2)；
The effective transmission speed of client C2 is:
Vc2＝Dmax/(T1+T2)。
With V1=10, V2=1, Th=1, Dmax=100 substitution following formula can obtain:
Vc1=Vc2=0.89, that is, the two-forty client is identical with the effective transmission speed of low rate client, and the two-forty client can't embody the speed advantage.
If Fig. 4, the technical scheme that provides embodiment illustrated in fig. 6 are provided, then the polymerization degree of depth of client C1 still is Dmax, and the polymerization degree of depth of client C2 can be according to formula (3) result calculated: D2=Dmax*V2/V1.Then the transmission time of each frame of client C1 is:
T1＝Th+Dmax/V1；
The transmission time of each frame of client C2 is:
T2＝Th+D2/V2
＝Th+Dmax/V1
=T1, that is, this moment, client C1 was identical with the transmission time of client C2.
Then the effective transmission speed of client C1 is:
Vc1＝Dmax/(T1+T2)；
The effective transmission speed of client C2 is:
Vc2＝D2/(T1+T2)。
With V1=10, V2=1, Th=1, Dmax=100 substitution following formula can obtain
Vc1＝4.55；
Vc2＝0.45。
As seen, compared with prior art, the effective transmission speed of client C1 is significantly improved, and has reached 10 times of client C2, has embodied the speed advantage.And referring to the aforementioned calculation process, Vc1+Vc2 promptly is the effective transmission speed of whole network.The effective transmission speed of the whole network that the employing prior art obtains is 1.78; The effective transmission speed that adopts above-mentioned Fig. 4, the technical scheme that provides embodiment illustrated in fig. 6 to obtain whole network is 5.00, is 2.8 times of prior art, has significantly improved the effective transmission speed of whole network.
The flow chart of the data transmission method for uplink of the WLAN (wireless local area network) that Fig. 7 provides for the embodiment of the invention.This method comprises:
The link speed of step 71, collection client; Specifically see above-mentioned Fig. 4, the explanation in embodiment illustrated in fig. 6 for details, as gather the link speed of client by preset period.
Also can comprise after the above-mentioned steps 71: the link speed of gathering is averaged, set the speed of institute's foundation and keep stable as far as possible, specifically see above-mentioned Fig. 4, the explanation in embodiment illustrated in fig. 6 for details to guarantee to set in the above-mentioned steps 73 polymerization.
At this moment, above-mentioned steps 72 can comprise: set the polymerization degree of depth according to described mean value, specifically see above-mentioned Fig. 4, the explanation in embodiment illustrated in fig. 6 for details.
Also can comprise after the above-mentioned steps 71: reject in the link speed of gathering the speed that links with the mean value difference maximum that links speed of gathering; Set the speed of institute's foundation and keep stable as far as possible to guarantee to set in the above-mentioned steps 73 polymerization, specifically see above-mentioned Fig. 4, the explanation in embodiment illustrated in fig. 6 for details.
At this moment, above-mentioned steps 72 can comprise: link the rate setting polymerization degree of depth according to linking of the mean value difference maximum that links speed of rejecting described and collection after the speed.
The technical scheme that present embodiment provides is by gathering the link speed of client, and according to the link rate setting polymerization degree of depth of client, can provide frame aggregation for the low rate client than low depth, for the two-forty client provides frame aggregation than high depth, thereby the transmission time that makes two-forty client and low rate client enjoy basically identical, solved the problem that the low rate client excessively takies the transmission time, guaranteed that each client takies the justice of channel, has promoted the transmission performance of whole network.
The structural representation of the wireless access point apparatus that Fig. 8 provides for the embodiment of the invention.This WAP (wireless access point) (AP) device comprises data sending device 81, be used to gather the link speed of client, and according to the link rate setting polymerization degree of depth of client, thereby for the low rate client provides frame aggregation than low depth, for the two-forty client provides frame aggregation than high depth.This data sending device 81 can be the data sending device of any WLAN (wireless local area network) that said apparatus embodiment provides.
In the present embodiment, wireless access point apparatus is by gathering the link speed of client, and according to the link rate setting polymerization degree of depth of client, can provide frame aggregation for the low rate client than low depth, for the two-forty client provides frame aggregation than high depth, thereby in the transmission time that makes two-forty client and low rate client enjoy basically identical, realized the fairness that client took the transmission time.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. the data sending device of a WLAN (wireless local area network) is characterized in that, comprising:
The frame transmitting element is used to set the link speed of client, and sends aggregate frame according to the link speed of setting to described client;
The speed collecting unit is used for gathering from described frame transmitting element the link speed of described client;
The polymerization depth setting unit is used for according to the described link rate setting polymerization degree of depth; The described polymerization degree of depth is the frame length that Frame to be sent is polymerized to aggregate frame; The destination of described data to be sent is described client;
Polymerized unit is used for described Frame to be sent is polymerized to the aggregate frame that frame length is the described polymerization degree of depth, is sent by described frame transmitting element.
2. the data sending device of WLAN (wireless local area network) according to claim 1 is characterized in that, the speed collecting unit is used for gathering by preset period the link speed of client.
3. the data sending device of WLAN (wireless local area network) according to claim 1 and 2 is characterized in that, also comprises:
The speed averaging unit is used for the link speed of gathering is averaged;
Described polymerization depth setting unit is used for setting the polymerization degree of depth according to described mean value.
4. the data sending device of WLAN (wireless local area network) according to claim 1 and 2 is characterized in that, also comprises:
Speed is rejected the unit, is used for rejecting the link speed of collection and the speed that links of the mean value difference maximum that links speed of gathering;
Described polymerization depth setting unit is used for linking the rate setting polymerization degree of depth according to linking of the mean value difference maximum that links speed of rejecting described and collection after the speed.
5. the data transmission method for uplink of a WLAN (wireless local area network) is characterized in that, comprising:
Gather the link speed of client;
According to the described link rate setting polymerization degree of depth; The described polymerization degree of depth is the frame length that Frame to be sent is polymerized to aggregate frame; The destination of described data to be sent is described client;
Described Frame to be sent is polymerized to the aggregate frame that frame length is the described polymerization degree of depth, sends.
6. the data transmission method for uplink of WLAN (wireless local area network) according to claim 5 is characterized in that, gathers the link speed of client, comprising:
Gather the link speed of client by preset period.
7. according to the data transmission method for uplink of claim 5 or 6 described WLAN (wireless local area network), it is characterized in that the link speed of gathering client also comprises afterwards:
The link speed of gathering is averaged;
According to the described link rate setting polymerization degree of depth, comprising: set the polymerization degree of depth according to described mean value.
8. according to the data transmission method for uplink of claim 5 or 6 described WLAN (wireless local area network), it is characterized in that the link speed of gathering client also comprises afterwards:
In the link speed of reject gathering with the speed that links of the mean value difference maximum that links speed of gathering;
According to the described link rate setting polymerization degree of depth, comprising: link the rate setting polymerization degree of depth after the speed according to linking of the mean value difference maximum that links speed of rejecting described and collection.
9. a wireless access point apparatus is characterized in that, comprises the data sending device of each described WLAN (wireless local area network) among the aforesaid right requirement 1-4.
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| CN109905327B (en) * | 2017-12-11 | 2021-05-07 | 网宿科技股份有限公司 | Wireless network data transmission method, sending end and receiving end |
| US11129044B2 (en) | 2017-12-11 | 2021-09-21 | Wangsu Science & Technology Co., Ltd. | Method for transmitting wireless network data, sending terminal and receiving terminal |
| WO2019238066A1 (en) * | 2018-06-15 | 2019-12-19 | 索尼公司 | Electronic device, method, and storage medium for use in wireless communication system |
| US11470623B2 (en) | 2018-06-15 | 2022-10-11 | Sony Corporation | Electronic device, method for wireless communication system and storage medium |
| CN111049625A (en) * | 2018-10-15 | 2020-04-21 | 珠海市魅族科技有限公司 | Wireless local area network communication method and communication equipment |
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