CN103856981B - Method for dynamically utilizing data packet aggregation transmission based on network state - Google Patents
Method for dynamically utilizing data packet aggregation transmission based on network state Download PDFInfo
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- CN103856981B CN103856981B CN201410122919.8A CN201410122919A CN103856981B CN 103856981 B CN103856981 B CN 103856981B CN 201410122919 A CN201410122919 A CN 201410122919A CN 103856981 B CN103856981 B CN 103856981B
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Abstract
The invention discloses a method for dynamically utilizing data packet aggregation transmission based on a network state, for mainly solving the problem that the performance of a network is degraded when data packet aggregation transmission is used under the condition that the network is not in a good state in the prior art. According to the scheme, the method comprises the following steps: firstly, counting the collision occurrence rate p of the network within present time through a wireless access point AP, setting a collision occurrence rate threshold th, subsequently comparing the collision occurrence rate p with the collision occurrence rate threshold, if p is greater than th, transmitting a single data packet at a wireless station and the wireless access point AP, and if p is less than or equal to th, packaging a plurality of data packets handed down from an upper computer into one medium access control (MAC) frames for transmitting through the wireless station and the wireless access point AP. By adopting the method, the data transmission time delay of the network is reduced, the performance of the network is improved, and the method can be applied to heavy-load network communication.
Description
Technical field
The invention belongs to communication technical field, further relates to be made based on network state dynamic in WLAN field
The method transmitted with packet, in can be used for the WLAN for employ data packet aggregation technique, reduces link transmission times,
Effectively lift the performance of wireless network.
Background technology
In the packet communication network based on open system interconnection OSI, each layer will add a head for data,
To deposit some control information.And the expense that these head transmission belts are come can bring very big impact to network performance, particularly
Under the conditions of heavy duty, these expenses can reduce the bandwidth availability ratio of applied business.For the less business of packet, head
The transmission shared time is more, wastes most transmission time.In order to reduce the transmission time overhead of head, can will be many
Individual Media access contorl mac frame is polymerized, using same physical layer PHY, or even same Media access contorl MAC
Head, effectively improves bandwidth availability ratio.Here it is so-called data packet aggregation technique, can be reduced often by using this method
Additional information in individual transmission frame, while can also reduce frame number and free time, so as to reduce protocol load, improves network and gulps down
The amount of telling.
B.Bellalta and M.Oliver：On the Performance of Packet Aggregation in
IEEE 802.11ac MU-MIMO WLANs,IEEE Communications Letters,2012,vol.16,no.10,
Destination address identical probability meeting very little, so causes data packet aggregation technique when pp.1588-1591 proposes that station number is very big
Can not be fully utilized, can be solved by increasing the length of queue.But the increase of queue length can increase in once transmission
The probability of scheduling mass data bag, i.e., exchange high throughput of system for long time delay as cost.This algorithm does not consider to work as channel
When being not in good state, if the packet bust thiss after polymerization, need longer time to go to process and retransmit the packet.Wireless network
In network, confirm that the successful mechanism of data transfer is exactly that the acknowledgement frame ACK from recipient is received within the time of regulation.And gather
Packet transmission time after conjunction is longer, so its time to be confirmed such as corresponding is bigger than single packet.So
Confirm that the time of the data frame transfer failure after polymerization is just larger, and it is also longer to retransmit the time for spending.So in network state
Use data packet aggregation technique, needs to take a long time process and collide and retransmit in the case of bad, cause whole net
The time delay of network increases, and network performance is reduced.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, propose a kind of based on network state dynamic control number
According to the method for packet aggregation, to reduce the time delay of network, network performance is improved.
For achieving the above object, technical scheme includes：
(1) wireless access point AP sends data to wireless site, i.e. downlink data transmission：
1a) wireless access point AP arranges network collision incidence rate threshold value th, and records in current slot in channel and send out
Ratio between the number of times of raw collision and the number of times of initiation data transfer, that is, collide incidence rate p；
1b) wireless access point AP obtains channel by competition, incidence rate p will be collided in the current slot of record and is arranged
Collision incidence rate threshold value th be compared, if p>Th, then wireless access point AP directly transmit single packet；If p≤th,
Then wireless access point AP will be sent after data packet aggregation；
(2) wireless site sends data to wireless access point AP, i.e. transmitting uplink data：
2a) wireless site in network is obtained after channel by competition, and to wireless access point AP request to send frame is sent
RTS, with reserve channel；
2b) wireless access point AP is received after request to send frame RTS of wireless site, produces a confirmation transmission frame
CTS, and change the frame format for confirming transmission frame CTS, that is, increase a polymerization flag bit；
2c) wireless access point AP collision incidence rate p will be entered in the current slot of record with collision incidence rate threshold value th
Row compares, if p>Th, then wireless access point AP will confirm that the polymerization flag bit in transmission frame CTS is set to 0, if p≤th, nothing
Line access point AP will confirm that the polymerization flag bit in transmission frame CTS is set to 1, then confirmation transmission frame CTS is sent to wirelessly
Website, acknowledgement channel is preengage successfully；
2d) wireless site is checked to the confirmation transmission frame CTS for receiving：If confirming the polymerization mark in transmission frame CTS
Will position is 0, then wireless site sends single packet to wireless access point AP；If confirming the polymerization flag bit in transmission frame CTS
For 1, then wireless site will be sent to wireless access point AP after data packet aggregation.
The present invention has compared with prior art advantages below：
The present invention uses packet aggregation transfer according to network state dynamic, i.e., enter line number in the case where network condition is good
Transmit according to packet aggregation, and the transmission of single packet is carried out in the case where network condition is not good, reduce packet bust thiss
Probability, and then reduce the time delay of whole network, improve the performance of wireless network.
Description of the drawings
Fig. 1 is the general flow chart of the present invention；
Fig. 2 is the sub-process figure of the downlink data transmission in the present invention；
Fig. 3 is the sub-process figure of the transmitting uplink data in the present invention.
Specific embodiment
With reference to Fig. 1, the present invention's realizes that step is as follows：
Step 1, channel competition.
Wireless access point AP and wireless site competitive channel, if wireless access point AP acquisition channel, execution step 2, if
Wireless site obtains channel, then execution step 3, if wireless access point AP and wireless site are not all obtained in channel, i.e. channel sending out
Collision is given birth to, then execution step 4.
Step 2, wireless access point AP to wireless site sends data, that is, carry out downlink data transmission.
With reference to Fig. 2, this step is implemented as follows：
2a) the collision frequency n for occurring and the number of times m for initiating data transfer in wireless access point AP statistics current slot,
The ratio of the collision number of times for occurring and the number of times for sending packet transmission is calculated, that is, collides incidence rate p；
2b) wireless access point AP arranges network collision incidence rate threshold value th：
Network collides the setting of incidence rate threshold value th in prior art, typically will be current during real network light traffic
Collision incidence rate in time period on channel is set to collide incidence rate threshold value th；
2c) incidence rate p will be collided in current time to be compared with collision incidence rate threshold value th：
If p≤th, i.e., channel conditions are good, then wireless access point AP is by data packet aggregation, will multiple upper stratas pay
Data envelope be attached in a Media access contorl mac frame, be sent to wireless site,
If p>Th, i.e. channel conditions be not good, then wireless access point AP sends single packet to wireless site, data is activation
After the completion of, execution step 4.
Step 3, wireless site to wireless access point AP sends data, that is, carry out transmitting uplink data.
With reference to Fig. 3, this step is implemented as follows：
After 3a) wireless site initiates wireless site in channel booking, i.e. network by competition acquisition channel, to wireless
Access point AP sends request to send frame RTS, with reserve channel；
3b) wireless access point AP is arranged and confirms transmission frame CTS, and is sent to wireless site：
Wireless access point AP is received after request to send frame RTS of wireless site, produces a confirmation transmission frame
CTS, and change the frame format for confirming transmission frame CTS, that is, increase a polymerization flag bit；
Wireless access point AP will be collided incidence rate p and be compared with collision incidence rate threshold value th in the current slot of record
Compared with：
If p>Th, i.e. network condition be not good, then wireless access point AP will confirm that the polymerization flag bit in transmission frame CTS is arranged
For 0,
If p≤th, i.e., network state is good, then wireless access point AP will confirm that the polymerization flag bit in transmission frame CTS is arranged
For 1, then confirmation transmission frame CTS is sent to into wireless site, acknowledgement channel is preengage successfully；
3c) wireless site sends data to WAP according to confirmation transmission frame CTS：
Wireless site is checked to the confirmation transmission frame CTS for receiving：If confirming the polymerization flag bit in transmission frame CTS
For 0, then wireless site sends single packet to wireless access point AP；If confirming, the polymerization flag bit in transmission frame CTS is 1,
The data packet aggregation that then wireless site pays on upper strata, will the data envelope paid of multiple upper stratas be attached to it is same
In Media access contorl mac frame, wireless access point AP, execution step 4 are sent to.
Step 4, continues competitive channel.
Wireless site and wireless access point AP are kept out of the way, and after completing to keep out of the way, return to step 1 continues competitive channel.
Above description is only example of the present invention, does not constitute any limitation of the invention, it is clear that for this
For the professional in field, after present invention and principle has been understood, all may be without departing substantially from the principle of the invention, structure
In the case of, various amendments and the change in form and details is carried out, but these amendments and change based on inventive concept are still
Within the claims of the present invention.
Claims (2)
1. a kind of method for using packet aggregation transfer based on network state dynamic, comprises the steps：
（1）Wireless access point AP sends data to wireless site, i.e. downlink data transmission：
1a）Wireless access point AP arranges network collision incidence rate threshold value th, and records in current slot and touched in channel
Ratio between the number of times for hitting and the number of times for initiating data transfer, that is, collide incidence rate p；
1b）Wireless access point AP obtains channel by competition, incidence rate p will be collided in the current slot of record with touching for arranging
Hit incidence rate threshold value th to be compared, if p>Th, then wireless access point AP directly transmit single packet；If p≤th, nothing
Line access point AP will be sent after data packet aggregation；
（2）Wireless site sends data to wireless access point AP, i.e. transmitting uplink data：
2a）Wireless site in network is obtained after channel by competition, and to wireless access point AP request to send frame RTS is sent, with
Reserve channel；
2b）Wireless access point AP is received after request to send frame RTS of wireless site, produces a confirmation transmission frame CTS,
And change the frame format for confirming transmission frame CTS, that is, increase a polymerization flag bit；
2c）Wireless access point AP will be collided incidence rate p and be compared with collision incidence rate threshold value th in the current slot of record
Compared with if p>Th, then wireless access point AP will confirm that the polymerization flag bit in transmission frame CTS is set to 0, if p≤th, wirelessly connect
Access point AP will confirm that the polymerization flag bit in transmission frame CTS is set to 1, then confirmation transmission frame CTS is sent to into wireless site,
Acknowledgement channel is preengage successfully；
2d）Wireless site is checked to the confirmation transmission frame CTS for receiving：If confirming the polymerization flag bit in transmission frame CTS
For 0, then wireless site sends single packet to wireless access point AP；If confirming, the polymerization flag bit in transmission frame CTS is 1,
Then wireless site will be sent to wireless access point AP after data packet aggregation.
2. method according to claim 1, wherein step 1b）In data packet aggregation, be to pay on upper strata
Multiple packets, in being encapsulated into same Media access contorl mac frame, i.e., using same Media access contorl mac frame head.
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| CN107426768B (en) * | 2017-07-05 | 2019-08-20 | 江苏中科羿链通信技术有限公司 | A kind of wireless self-organization network data transmission method |
| CN110636546A (en) * | 2019-09-26 | 2019-12-31 | 中科睿微(宁波)电子技术有限公司 | Method and system for transmitting data frame of wireless local area network |
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| CN102905311A (en) * | 2012-09-29 | 2013-01-30 | 北京傲天动联技术有限公司 | Data-message aggregating device and method |
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| US7474676B2 (en) * | 2004-09-10 | 2009-01-06 | Mitsubishi Electric Research Laboratories, Inc. | Frame aggregation in wireless communications networks |
| US8730884B2 (en) * | 2009-10-20 | 2014-05-20 | Electronics And Telecommunications Research Institute | Method for managing resources in high capacity wireless communication system |
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| CN101742559A (en) * | 2009-12-04 | 2010-06-16 | 西安电子科技大学 | Parallel RTS (remote terminal system) processing multiple access method supporting MIMO (multiple input multiple output) in ad hoc network |
| WO2011110779A1 (en) * | 2010-03-08 | 2011-09-15 | France Telecom | Methods for transmitting and receiving data using a plurality of radio channels, transmission devices and corresponding recipient, signal and computer program |
| CN102724706A (en) * | 2012-06-19 | 2012-10-10 | 天津大学 | Two-stage frame aggregation method |
| CN103686838A (en) * | 2012-09-05 | 2014-03-26 | 中兴通讯股份有限公司 | Self-adaptive contention window value adjustment method and device |
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Effective date of registration: 20200623 Address after: 710000 Shaanxi province Xi'an Beilin District torch Road No. 4 5 storey factory building area E Patentee after: XI'AN THREE GOOD SOFTWARE TECHNOLOGY SHARES Ltd. Address before: Xi'an City, Shaanxi province Taibai Road 710071 No. 2 Patentee before: XIDIAN University |