CN105472655A - Congestion window adjustment method and related devices and system thereof - Google Patents

Abstract

The invention discloses a congestion window adjustment method and related devices and a system thereof. According to the technical scheme, the TCP connection establishing process is actively detected by a wireless network access point, and link capacity information of a wireless link between a network server and a mobile terminal is determined when establishing of TCP connection of the network server and the mobile terminal accessing to the wireless network access point is detected; and the link capacity information is transmitted to the network server, and the network server determines the size of the optimal congestion window according to the link capacity information and adjusts the current congestion window according to the determined size of the optimal congestion window so that the congestion window is enabled to be rapidly adjusted to the size matched with the wireless link, and utilization rate of wireless resources can be greatly enhanced.

Description

A kind of method of adjustment of congestion window, relevant apparatus and system

Technical field

The present invention relates to wireless communication technology field, particularly relate to a kind of method of adjustment of congestion window, relevant apparatus and system.

Background technology

Traditional transmission control protocol (TransmissionControlProtocol, TCP) for wired networks design, mainly use traffic controlling mechanism sounds out the network bandwidth, when detecting Network Packet Loss, then think that network occurs congested, thus adjustment congestion window reduces the transmission rate of transmitting terminal.And at WLAN (wireless local area network) (WirelessLocalAreaNetwork, WLAN) in wireless channel, because the quality of wireless channel is more unstable compared with the quality of wire message way, the higher error rate and the mobility of terminal can cause to transmit frequently interrupts and packet loss, in this case, traditional TCP can be made to think by mistake according to TCP flow amount controlling mechanism is congestion packet loss, thus " blindly " adjustment congestion window.And after quality of eating dishes without rice or wine is improved, traditional TCP generally adopts " slow turn-on " and " Congestion Avoidance " mechanism to adjust congestion window, thus transmission rate is contained on a lower grade for a long time, thus the remaining bandwidth of network can not be made full use of, cause the waste of Internet resources.

TCP optimization method under existing wireless network scenario, mainly considers the above-mentioned deficiency of conventional TCP, by obtaining wireless side information, adjusts TCP parameter in advance, reduces wireless side packet loss to the impact of congestion window.According to the difference of optimization means, existing scheme can be divided three classes:

First kind optimization method obtains the mass measurement of the wireless link between content server and subscriber equipment at intermediate network node place, and Detection job measures whether meet predetermined condition; When mass measurement does not meet predetermined condition, sent the message of the freezing mode that trigger content server is connected with the TCP between subscriber equipment by intermediate network node, and when quality of connection improves (recovery), trigger the message recovered TCP and connect.

Equations of The Second Kind optimization method obtains the mass measurement of the wireless link between content server and subscriber equipment equally at intermediate network node place, but with the first unlike, this kind of optimization method can according to the mass measurement of link, utilize the size of the mode determination congestion window of tabling look-up, and revise the window Window value of acknowledge character (Acknowledgement, the ACK) packet header received.

3rd class optimization method is that TCP server carries out bandwidth estimation according to the time difference receiving ack msg bag, and when detecting packet loss, arranges congestion window size, ssthresh according to bandwidth value.

There is following shortcoming in above-mentioned three kinds of optimization methods:

First kind optimization method connects by freezing TCP, adjustment to TCP congestion window when reducing wireless random loss, thus when radio link quality is improved, the transmission of original TCP congestion window size can be continued, but this method freezed TCP and connect, can cause and hold over Radio Resource and the situation not transmitting data, thus still may have the problem of waste of radio resources.

Equations of The Second Kind optimization method needs the information in midway amendment ack msg bag, easily causes the increase of round-trip delay (Round-TripTime, RTT), and then has an impact to whole TCP performance.

Although congestion window can be adjusted to the size matched with wireless environment by the 3rd class optimization method, owing to depending on ack msg bag estimated bandwidth, the problem of Retransmission timeout (RetransmissionTimeout, RTO) cannot be solved.

Summary of the invention

The embodiment of the present invention provides a kind of method of adjustment of congestion window, relevant apparatus and system, thus improves wireless resource utility efficiency.

The embodiment of the present invention is by the following technical solutions:

First aspect, provides a kind of method of adjustment of congestion window, comprising:

Wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, and determines the link capability information of the wireless link between the described webserver and described mobile terminal;

The link capability information determined is sent to the described webserver by described wireless network access point, and the link capability information that the described webserver is determined according to this adjusts current congestion window.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, determine the link capability information of the wireless link between the described webserver and described mobile terminal, specifically comprise:

According to formula one, described wireless network access point determines that the link of current time t is eated dishes without rice or wine quality information CQIest (t);

According to the CQIest (t) determined, select the code modulation mode MCS corresponding with the CQIest (t) determined, and determine the transmission rate r corresponding with the MCS selected;

Wireless throughput information TPest (t) of the described mobile terminal of current time t is determined again according to formula two;

Wherein, formula one is: $\mathrm{CQIest}\left(t\right)=A\left(t\right)\underset{t^{\′}=1}{\overset{T1}{\mathrm{\Σ}}}\{e^{-\mathrm{alpha}*(t-t^{\′})}*\mathrm{CQI}\left(t^{\′}\right)\};$

Formula two is: $\mathrm{TPest}\left(t\right)=\frac{r}{\mathrm{SUM}\left\{r\right\}}*\mathrm{RBNo};$

Wherein, t ＇ is the historical juncture before current time t, T1 be greater than 1 natural number;

The channel quality information that CQI (t ＇) is historical juncture t ＇;

Alpha is the first weight coefficient;

A (t) is the second weight coefficient; Wherein, A (t) meets:

RBNo is the quantity of all available resource block of described wireless network access point current time t.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, determine the link capability information of the wireless link between the described webserver and described mobile terminal, specifically comprise:

Described wireless network access point is according to wireless throughput information TPest (t) of the described mobile terminal of following formula determination current time t:

$\mathrm{TPest}\left(t\right)=B\left(t\right)\underset{t^{\′}=1}{\overset{T2}{\mathrm{\Σ}}}\{e^{-\mathrm{belta}*(t-t^{\′})}*\mathrm{TP}\left(t^{\′}\right)\};$

Wherein, t ＇ is the historical juncture before current time t, T2 be greater than 1 natural number;

The radio throughput information that TP (t ＇) is the described mobile terminal of historical juncture t ＇; Belta is the 3rd weight coefficient;

B (t) is the 4th weight coefficient; Wherein, B (t) meets:

Optionally, the link capability information determined is sent to the described webserver by described wireless network access point, specifically comprises:

The link capability information determined is sent to the described webserver by the signaling between described wireless network access point and the described webserver by described wireless network access point; Or

The link capability information determined by the signaling between described wireless network access point and intermediate network node, is sent to described intermediate network node, passes to the described webserver by described intermediate network node by described wireless network access point.

Optionally, the link capability information determined is sent to the described webserver by described wireless network access point, specifically comprises:

The link capability information determined is carried on described mobile terminal and sends in the packet of the described webserver by described wireless network access point, sends to the described webserver.

Second aspect, provides a kind of method of adjustment of congestion window, comprising:

The webserver receives the link capability information that wireless network access point sends; Wherein, described link capability information is that described wireless network access point detects that the mobile terminal of the described webserver and the described wireless network access point of access is set up and to determine when transmission control protocol TCP is connected and to send;

The link capability information that the described webserver sends according to described wireless network access point, determines the size of best congestion window;

The described webserver, according to the size of described best congestion window, adjusts current congestion window.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal.

Optionally, the link capability information that the described webserver sends according to described wireless network access point, determine the size of best congestion window, specifically comprise:

The size of best congestion window is determined according to following formula:

CWNDopt＝RTT×Throughput/SegmentSize；

Wherein, CWNDopt is the size of best congestion window;

RTT is the round-trip delay of the described webserver to described mobile terminal transmission packet;

Throughput is the wireless throughput information of described mobile terminal;

SegmentSize is the size of the packet that the described webserver transmits to described mobile terminal.

The third aspect, provides a kind of wireless network access point, comprising:

Link capability information determination unit, for detect the webserver and access described wireless network access point mobile terminal set up transmission control protocol TCP be connected time, determine the link capability information of the wireless link between the described webserver and described mobile terminal;

Link capability information transmitting unit, sends to the described webserver for the link capability information determined by link capability information determination unit, and the link capability information that the described webserver is determined according to this adjusts current congestion window.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Described link capability information determination unit, specifically for:

Determine that the link of current time t is eated dishes without rice or wine quality information CQIest (t) according to formula one;

According to the CQIest (t) determined, select the code modulation mode MCS corresponding with the CQIest (t) determined, and determine the transmission rate r corresponding with the MCS selected;

Wireless throughput information TPest (t) of the described mobile terminal of current time t is determined again according to formula two;

Wherein, formula one is: $\mathrm{CQIest}\left(t\right)=A\left(t\right)\underset{t^{\′}=1}{\overset{T1}{\mathrm{\Σ}}}\{e^{-\mathrm{alpha}*(t-t^{\′})}*\mathrm{CQI}\left(t^{\′}\right)\};$

Formula two is: $\mathrm{TPest}\left(t\right)=\frac{r}{\mathrm{SUM}\left\{r\right\}}*\mathrm{RBNo};$

Wherein, t ＇ is the historical juncture before current time t, T1 be greater than 1 natural number;

The channel quality information that CQI (t ＇) is historical juncture t ＇;

Alpha is the first weight coefficient;

A (t) is the second weight coefficient; Wherein, A (t) meets:

RBNo is the quantity of all available resource block of described wireless network access point current time t.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Described link capability information determination unit, specifically for:

Wireless throughput information TPest (t) according to the described mobile terminal of following formula determination current time t:

$\mathrm{TPest}\left(t\right)=B\left(t\right)\underset{t^{\′}=1}{\overset{T2}{\mathrm{\Σ}}}\{e^{-\mathrm{belta}*(t-t^{\′})}*\mathrm{TP}\left(t^{\′}\right)\};$

Wherein, t ＇ is the historical juncture before current time t, T2 be greater than 1 natural number;

The radio throughput information that TP (t ＇) is the described mobile terminal of historical juncture t ＇; Belta is the 3rd weight coefficient;

B (t) is the 4th weight coefficient; Wherein, B (t) meets:

Optionally, described link capability information transmitting unit, specifically for:

The link capability information that described link capability information determination unit is determined is sent to the described webserver by the signaling between described wireless network access point and the described webserver; Or

The link capability information determined by described link capability information determination unit, by the signaling between described wireless network access point and intermediate network node, sends to described intermediate network node, passes to the described webserver by described intermediate network node.

Optionally, described link capability information transmitting unit, specifically for:

The link capability information that described link capability information determination unit is determined is carried on described mobile terminal send in the packet of the described webserver, sends to the described webserver.

Fourth aspect, provides a kind of webserver, comprising:

Link capability information receiving unit, for receiving the link capability information that wireless network access point sends; Wherein, described link capability information is that described wireless network access point detects that the mobile terminal of the described webserver and the described wireless network access point of access is set up and to determine when transmission control protocol TCP is connected and to send;

Best congestion window determining unit, for the link capability information received according to described link capability information receiving unit, determines the size of best congestion window;

Adjustment unit, for the size of best congestion window determined according to described best congestion window determining unit, adjusts current congestion window.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal.

Optionally, described best congestion window determining unit, specifically for:

The size of best congestion window is determined according to following formula:

CWNDopt＝RTT×Throughput/SegmentSize；

Wherein, CWNDopt is the size of best congestion window;

RTT is the round-trip delay of the described webserver to described mobile terminal transmission packet;

Throughput is the wireless throughput information of described mobile terminal;

SegmentSize is the size of the packet that the described webserver transmits to described mobile terminal.

5th aspect, provides a kind of adjustment System of congestion window, comprising: the webserver and wireless network access point, wherein:

Described wireless network access point, for detect the webserver and access described wireless network access point mobile terminal set up transmission control protocol TCP be connected time, determine the link capability information of the wireless link between the described webserver and described mobile terminal; The link capability information determined is sent to the described webserver;

The described webserver, for receive described wireless network access point send link capability information after, according to the link capability information that described wireless network access point sends, determine the size of best congestion window; And according to the size of described best congestion window, current congestion window is adjusted.

The beneficial effect of the embodiment of the present invention is as follows:

In the embodiment of the present invention, TCP connection procedure is set up by wireless network access point active detecting, and detect the mobile terminal of the webserver with access of radio network access point set up TCP be connected time, determine the link capability information of the wireless link between the webserver and mobile terminal, and send to the webserver, determined the size of best congestion window according to this link capability information by the webserver, and according to the size of this best congestion window determined, current congestion window is adjusted, thus congestion window rapid adjustment can be made to the size matched with wireless link, substantially increase wireless resource utility efficiency.

Accompanying drawing explanation

The realization flow figure of the method for adjustment of a kind of congestion window that Fig. 1 provides for the embodiment of the present invention;

The realization flow figure of the method for adjustment of a kind of congestion window that Fig. 2 provides for the embodiment of the present invention;

The structural representation of a kind of wireless network access point that Fig. 3 provides for the embodiment of the present invention;

The structural representation of the webserver that Fig. 4 provides for the embodiment of the present invention;

The structural representation of the adjustment System of a kind of congestion window that Fig. 5 provides for the embodiment of the present invention.

Embodiment

In order to solve problems of the prior art, embodiments provide a kind of Adjusted Option of congestion window.In this technical scheme, TCP connection procedure is set up by wireless network access point active detecting, and detect the mobile terminal of the webserver with access of radio network access point set up TCP be connected time, determine the link capability information of the wireless link between the webserver and mobile terminal, and send to the webserver, determined the size of best congestion window according to this link capability information by the webserver, and according to the size of this best congestion window determined, current congestion window is adjusted, thus congestion window rapid adjustment can be made to the size matched with wireless link, substantially increase wireless resource utility efficiency.

Below in conjunction with Figure of description, embodiments of the invention are described, should be appreciated that embodiment described herein is only for instruction and explanation of the present invention, is not limited to the present invention.And when not conflicting, the embodiment in the present invention and the feature of embodiment can be combined with each other.

Embodiments provide a kind of method, as shown in Figure 1, be the realization flow figure of the method, the executive agent of the method can be, but not limited to as wireless network access point, and for 3G network, wireless network access point refers to NodeB.

Specifically comprise the steps:

Step 11, wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, and determines the link capability information of the wireless link between the webserver and mobile terminal.

In the embodiment of the present invention, wireless network access point can by identifying the TCPSYN packet that mobile terminal sends and the acknowledge character (Acknowledgement that the webserver feeds back for this TCPSYN packet, ACK) packet, judges whether be in TCP connection procedure at that time.

When judge current be in TCP connection procedure time, just determine the link capability information of the wireless link between the webserver and mobile terminal.

Wherein, link capability information can be, but not limited to the wireless throughput information into mobile terminal.

For the wireless throughput information that link capability information is mobile terminal, determine that a kind of implementation of link capability information is as follows:

First, determine that the link of current time t is eated dishes without rice or wine quality information CQIest (t) according to formula (1);

$\mathrm{CQIest}\left(t\right)=A\left(t\right)\underset{t^{\′}=1}{\overset{T1}{\mathrm{\Σ}}}\{e^{-\mathrm{alpha}*(t-t^{\′})}*\mathrm{CQI}\left(t^{\′}\right)\};---\left(1\right)$

Wherein, t ＇ is the historical juncture before current time t, T1 be greater than 1 natural number;

The channel quality information that CQI (t ＇) is historical juncture t ＇;

Alpha is the first weight coefficient, and this value is larger, and represent that the channel quality information proportion of historical juncture t ＇ is less, the effect played is less;

A (t) is the second weight coefficient; Wherein, A (t) meets:

Then, according to the CQIest (t) determined, select the code modulation mode MCS corresponding with the CQIest (t) determined, and determine the transmission rate r corresponding with the MCS selected;

Finally, according to the following equation (2) determine wireless throughput information TPest (t) of the mobile terminal of current time t;

$\mathrm{TPest}\left(t\right)=\frac{r}{\mathrm{SUM}\left\{r\right\}}*\mathrm{RBNo};---\left(2\right)$

Wherein, RBNo is the quantity of all available resource block of wireless network access point current time t, and this available resource block can be time resource block, frequency resource block, space resources block etc.

Which mainly according to eat dishes without rice or wine quality and the loading condition of wireless link, calculates the wireless throughput of mobile terminal.

For the wireless throughput information that link capability information is mobile terminal, determine that the another kind of implementation of link capability information is as follows:

Wireless network access point determines wireless throughput information TPest (t) of the mobile terminal of current time t according to following formula (3):

$\mathrm{TPest}\left(t\right)=B\left(t\right)\underset{t^{\′}=1}{\overset{T2}{\mathrm{\Σ}}}\{e^{-\mathrm{belta}*(t-t^{\′})}*\mathrm{TP}\left(t^{\′}\right)\};---\left(3\right)$

Wherein, t ＇ is the historical juncture before current time t, T2 be greater than 1 natural number;

The throughput information that TP (t ＇) is the described mobile terminal of historical juncture t ＇;

Belta is the 3rd weight coefficient;

B (t) is the 4th weight coefficient; Wherein, B (t) meets:

Which, mainly according to historical throughput information, calculates current throughput.

Above-mentioned two kinds of modes all can determine link capability information, in actual applications, can adopt any one realization of above-mentioned two kinds of modes.

For the above-mentioned second way, work as T2=2,2 historical junctures namely before current time t, be labeled as t-1 and t-2 herein, then can determine the link quality information of the wireless link between the webserver and mobile terminal according to the following equation:

TPest(t)＝a*TP(t-1)+(1-a)*TP(t-2)；

Wherein, 0<=a<=1, and a=B (t) e ^{-belta* (t-1)}, 1-a=B (t) e ^{-belta* (t-2)};

TP (t-1) and TP (t-2) was a upper moment of current time t and the wireless throughput in upper upper moment respectively, and TPest (t) is the wireless throughput estimated value of current time t.

Step 12, the link capability information determined is sent to the webserver by wireless network access point, and the link capability information that the webserver is determined according to this adjusts current congestion window.

Wherein, the transmission means of link capability information can be, but not limited to into instantaneous transmission or etc. to be transmitted:

Instantaneous transmission mode:

The link capability information determined is sent to the webserver by the signaling between wireless network access point and the webserver by wireless network access point; Or

The link capability information determined by the signaling between wireless network access point and intermediate network node, is sent to intermediate network node, passes to the webserver by described intermediate network node by wireless network access point.

Wait for transmission means:

The link capability information determined is carried on mobile terminal and sends in the packet of the webserver by wireless network access point, such as mobile terminal and the webserver are being set up in TCP connection procedure, mobile terminal sends to the ack msg bag of the webserver, sends to the webserver.

In the embodiment of the present invention, TCP connection procedure is set up by wireless network access point active detecting, and detect the mobile terminal of the webserver with access of radio network access point set up TCP be connected time, determine the link capability information of the wireless link between the webserver and mobile terminal, and send to the webserver, determined the size of best congestion window according to this link capability information by the webserver, and according to the size of this best congestion window determined, current congestion window is adjusted, thus congestion window rapid adjustment can be made to the size matched with wireless link, substantially increase wireless resource utility efficiency.

Corresponding with wireless network access point, the embodiment of the present invention additionally provides a kind of method of adjustment of congestion window, and as shown in Figure 2, the executive agent of the method can be, but not limited to as the webserver, and such as TCP server, specifically comprises the steps:

Step 21, the webserver receives the link capability information that wireless network access point sends;

Wherein, link capability information is that wireless network access point detects that the webserver and the mobile terminal of access of radio network access point are set up and to determine when TCP is connected and to send;

Wherein, link capability information can be, but not limited to the wireless throughput information into mobile terminal.

Step 22, the link capability information that the webserver sends according to wireless network access point, determines the size of best congestion window;

For the wireless throughput information that link capability information is mobile terminal, this step 22 can be, but not limited to the size determining best congestion window according to following formula:

CWNDopt＝RTT×Throughput/SegmentSize；

Wherein, CWNDopt is the size of best congestion window;

RTT is the round-trip delay of the webserver to mobile terminal transmission packet;

Throughput is the wireless throughput information of mobile terminal;

SegmentSize is the size of the packet that the webserver transmits to mobile terminal.

Step 23, the webserver, according to the size of described best congestion window, adjusts current congestion window.

In the embodiment of the present invention, TCP connection procedure is set up by wireless network access point active detecting, and detect the mobile terminal of the webserver with access of radio network access point set up TCP be connected time, determine the link capability information of the wireless link between the webserver and mobile terminal, and send to the webserver, determined the size of best congestion window according to this link capability information by the webserver, and according to the size of this best congestion window determined, current congestion window is adjusted, thus congestion window rapid adjustment can be made to the size matched with wireless link, substantially increase wireless resource utility efficiency.

Such as, when just to set up TCP and connect, the size of congestion window is 1; And the size of optimum congestion window is 8.If utilize traditional slow turn-on mode (namely congestion window linearly increases), need 3 RTT times; According to the said method that the embodiment of the present invention provides, TCP server can determine the size of optimum congestion window immediately, and so tcp window can shift to an earlier date 3 RTT times and enters into more excellent mode of operation.A RTT, probably at 50 ~ 300ms, is so 100-600ms.The scheme that namely embodiment of the present invention provides can make to eat dishes without rice or wine to shift to an earlier date the operating state that 1.5s enters optimization.

Based on same inventive concept, also corresponding adjusting device and the system providing congestion window in the embodiment of the present invention, the principle of dealing with problems due to following apparatus and system is similar to the method for adjustment of congestion window, therefore the enforcement of following apparatus and system see the enforcement of method, can repeat part and repeats no more.

As shown in Figure 3, be the structural representation of a kind of wireless network access point that the embodiment of the present invention provides, specifically comprise following unit module:

Link capability information determination unit 31, for detect the webserver and access described wireless network access point mobile terminal set up transmission control protocol TCP be connected time, determine the link capability information of the wireless link between the described webserver and described mobile terminal;

Link capability information transmitting unit 32, sends to the described webserver for the link capability information determined by link capability information determination unit, and the link capability information that the described webserver is determined according to this adjusts current congestion window.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Described link capability information determination unit 31, specifically for:

Determine that the link of current time t is eated dishes without rice or wine quality information CQIest (t) according to formula one;

According to the CQIest (t) determined, select the code modulation mode MCS corresponding with the CQIest (t) determined, and determine the transmission rate r corresponding with the MCS selected;

Wireless throughput information TPest (t) of the described mobile terminal of current time t is determined again according to formula two;

Wherein, formula one is: $\mathrm{CQIest}\left(t\right)=A\left(t\right)\underset{t^{\&prime;}=1}{\overset{T1}{\mathrm{\&Sigma;}}}\{e^{-\mathrm{alpha}*(t-t^{\&prime;})}*\mathrm{CQI}\left(t^{\&prime;}\right)\};$

Formula two is: $\mathrm{TPest}\left(t\right)=\frac{r}{\mathrm{SUM}\left\{r\right\}}*\mathrm{RBNo};$

Wherein, t ＇ is the historical juncture before current time t, T1 be greater than 1 natural number;

The channel quality information that CQI (t ＇) is historical juncture t ＇;

Alpha is the first weight coefficient;

A (t) is the second weight coefficient; Wherein, A (t) meets:

RBNo is the quantity of all available resource block of described wireless network access point current time t.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Described link capability information determination unit 31, specifically for:

Wireless throughput information TPest (t) according to the described mobile terminal of following formula determination current time t: $\mathrm{TPest}\left(t\right)=B\left(t\right)\underset{t^{\&prime;}=1}{\overset{T2}{\mathrm{\&Sigma;}}}\{e^{-\mathrm{belta}*(t-t^{\&prime;})}*\mathrm{TP}\left(t^{\&prime;}\right)\};$

Wherein, t ＇ is the historical juncture before current time t, T2 be greater than 1 natural number;

The radio throughput information that TP (t ＇) is the described mobile terminal of historical juncture t ＇; Belta is the 3rd weight coefficient;

B (t) is the 4th weight coefficient; Wherein, B (t) meets:

Optionally, described link capability information transmitting unit 32, specifically for:

The link capability information that described link capability information determination unit 31 is determined is sent to the described webserver by the signaling between described wireless network access point and the described webserver; Or

The link capability information determined by described link capability information determination unit 31, by the signaling between described wireless network access point and intermediate network node, sends to described intermediate network node, passes to the described webserver by described intermediate network node.

Optionally, described link capability information transmitting unit 32, specifically for:

The link capability information that described link capability information determination unit 31 is determined is carried on described mobile terminal send in the packet of the described webserver, sends to the described webserver.

As shown in Figure 4, be the structural representation of a kind of webserver that the embodiment of the present invention provides, specifically comprise following unit module:

Link capability information receiving unit 41, for receiving the link capability information that wireless network access point sends; Wherein, described link capability information is that described wireless network access point detects that the mobile terminal of the described webserver and the described wireless network access point of access is set up and to determine when transmission control protocol TCP is connected and to send;

Best congestion window determining unit 42, for the link capability information received according to described link capability information receiving unit 41, determines the size of best congestion window;

Adjustment unit 43, for the size of best congestion window determined according to described best congestion window determining unit 42, adjusts current congestion window.

Optionally, described link capability information is:

The wireless throughput information of described mobile terminal.

Optionally, described best congestion window determining unit 42, specifically for:

The size of best congestion window is determined according to following formula:

CWNDopt＝RTT×Throughput/SegmentSize；

Wherein, CWNDopt is the size of best congestion window;

RTT is the round-trip delay of the described webserver to described mobile terminal transmission packet;

Throughput is the wireless throughput information of described mobile terminal;

SegmentSize is the size of the packet that the described webserver transmits to described mobile terminal.

Based on same inventive concept, embodiments provide a kind of adjustment System of congestion window, as shown in Figure 5, realize schematic diagram for this system, comprise following unit module:

The webserver 51 and wireless network access point 52, wherein:

Described wireless network access point 52, for detect the webserver 51 and access described wireless network access point 52 mobile terminal set up transmission control protocol TCP be connected time, determine the link capability information of the wireless link between the described webserver 51 and described mobile terminal; The link capability information determined is sent to the described webserver 51;

The described webserver 51, after receiving link capability information that described wireless network access point 52 sends, according to the link capability information that described wireless network access point 52 sends, determines the size of best congestion window; And according to the size of described best congestion window, current congestion window is adjusted.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (17)

1. a method of adjustment for congestion window, is characterized in that, comprising:

Wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, and determines the link capability information of the wireless link between the described webserver and described mobile terminal;

The link capability information determined is sent to the described webserver by described wireless network access point, and the link capability information that the described webserver is determined according to this adjusts current congestion window.

2. the method for claim 1, is characterized in that, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, determine the link capability information of the wireless link between the described webserver and described mobile terminal, specifically comprise:

According to formula one, described wireless network access point determines that the link of current time t is eated dishes without rice or wine quality information CQIest (t);

According to the CQIest (t) determined, select the code modulation mode MCS corresponding with the CQIest (t) determined, and determine the transmission rate r corresponding with the MCS selected;

Wireless throughput information TPest (t) of the described mobile terminal of current time t is determined again according to formula two;

Wherein, formula one is: $\mathrm{CQIest}\left(t\right)=A\left(t\right)\underset{t^{\&prime;}=1}{\overset{T1}{\mathrm{\&Sigma;}}}\{e^{-\mathrm{alpha}*(t-t^{\&prime;})}*\mathrm{CQI}\left(t^{\&prime;}\right)\};$

Formula two is: $\mathrm{TPest}\left(t\right)=\frac{r}{\mathrm{SUM}\left\{r\right\}}*\mathrm{RBNo};$

Wherein, t ＇ is the historical juncture before current time t, T1 be greater than 1 natural number;

The channel quality information that CQI (t ＇) is historical juncture t ＇;

Alpha is the first weight coefficient;

A (t) is the second weight coefficient; Wherein, A (t) meets:

RBNo is the quantity of all available resource block of described wireless network access point current time t.

3. the method for claim 1, is characterized in that, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Wireless network access point detects that the mobile terminal of the webserver and the described wireless network access point of access sets up transmission control protocol TCP when being connected, determine the link capability information of the wireless link between the described webserver and described mobile terminal, specifically comprise:

Described wireless network access point is according to wireless throughput information TPest (t) of the described mobile terminal of following formula determination current time t:

$\mathrm{TPest}\left(t\right)=B\left(t\right)\underset{t^{\&prime;}=1}{\overset{T2}{\mathrm{\&Sigma;}}}\{e^{-\mathrm{belta}*(t-t^{\&prime;})}*\mathrm{TP}\left(t^{\&prime;}\right)\};$

Wherein, t ＇ is the historical juncture before current time t, T2 be greater than 1 natural number;

The radio throughput information that TP (t ＇) is the described mobile terminal of historical juncture t ＇; Belta is the 3rd weight coefficient;

B (t) is the 4th weight coefficient; Wherein, B (t) meets:

4. the method as described in as arbitrary in claim 1-3, it is characterized in that, the link capability information determined is sent to the described webserver by described wireless network access point, specifically comprises:

The link capability information determined is sent to the described webserver by the signaling between described wireless network access point and the described webserver by described wireless network access point; Or

The link capability information determined by the signaling between described wireless network access point and intermediate network node, is sent to described intermediate network node, passes to the described webserver by described intermediate network node by described wireless network access point.

5. the method as described in as arbitrary in claim 1-3, it is characterized in that, the link capability information determined is sent to the described webserver by described wireless network access point, specifically comprises:

The link capability information determined is carried on described mobile terminal and sends in the packet of the described webserver by described wireless network access point, sends to the described webserver.

6. a method of adjustment for congestion window, is characterized in that, comprising:

The webserver receives the link capability information that wireless network access point sends; Wherein, described link capability information is that described wireless network access point detects that the mobile terminal of the described webserver and the described wireless network access point of access is set up and to determine when transmission control protocol TCP is connected and to send;

The link capability information that the described webserver sends according to described wireless network access point, determines the size of best congestion window;

The described webserver, according to the size of described best congestion window, adjusts current congestion window.

7. method as claimed in claim 6, it is characterized in that, described link capability information is:

The wireless throughput information of described mobile terminal.

8. method as claimed in claim 7, is characterized in that the link capability information that the described webserver sends according to described wireless network access point is determined the size of best congestion window, specifically comprised:

The size of best congestion window is determined according to following formula:

CWNDopt＝RTT×Throughput/SegmentSize；

Wherein, CWNDopt is the size of best congestion window;

RTT is the round-trip delay of the described webserver to described mobile terminal transmission packet;

Throughput is the wireless throughput information of described mobile terminal;

SegmentSize is the size of the packet that the described webserver transmits to described mobile terminal.

9. a wireless network access point, is characterized in that, comprising:

Link capability information determination unit, for detect the webserver and access described wireless network access point mobile terminal set up transmission control protocol TCP be connected time, determine the link capability information of the wireless link between the described webserver and described mobile terminal;

Link capability information transmitting unit, sends to the described webserver for the link capability information determined by link capability information determination unit, and the link capability information that the described webserver is determined according to this adjusts current congestion window.

10. wireless network access point as claimed in claim 9, it is characterized in that, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Described link capability information determination unit, specifically for:

Determine that the link of current time t is eated dishes without rice or wine quality information CQIest (t) according to formula one;

According to the CQIest (t) determined, select the code modulation mode MCS corresponding with the CQIest (t) determined, and determine the transmission rate r corresponding with the MCS selected;

Wireless throughput information TPest (t) of the described mobile terminal of current time t is determined again according to formula two;

Wherein, formula one is: $\mathrm{CQIest}\left(t\right)=A\left(t\right)\underset{t^{\&prime;}=1}{\overset{T1}{\mathrm{\&Sigma;}}}\{e^{-\mathrm{alpha}*(t-t^{\&prime;})}*\mathrm{CQI}\left(t^{\&prime;}\right)\};$

Formula two is: $\mathrm{TPest}\left(t\right)=\frac{r}{\mathrm{SUM}\left\{r\right\}}*\mathrm{RBNo};$

Wherein, t ＇ is the historical juncture before current time t, T1 be greater than 1 natural number;

The channel quality information that CQI (t ＇) is historical juncture t ＇;

Alpha is the first weight coefficient;

A (t) is the second weight coefficient; Wherein, A (t) meets:

RBNo is the quantity of all available resource block of described wireless network access point current time t.

11. wireless network access points as claimed in claim 9, it is characterized in that, described link capability information is:

The wireless throughput information of described mobile terminal; Then

Described link capability information determination unit, specifically for:

Wireless throughput information TPest (t) according to the described mobile terminal of following formula determination current time t:

$\mathrm{TPest}\left(t\right)=B\left(t\right)\underset{t^{\&prime;}=1}{\overset{T2}{\mathrm{\&Sigma;}}}\{e^{-\mathrm{belta}*(t-t^{\&prime;})}*\mathrm{TP}\left(t^{\&prime;}\right)\};$

Wherein, t ＇ is the historical juncture before current time t, T2 be greater than 1 natural number;

The radio throughput information that TP (t ＇) is the described mobile terminal of historical juncture t ＇; Belta is the 3rd weight coefficient;

B (t) is the 4th weight coefficient; Wherein, B (t) meets:

12. as arbitrary in claim 9-11 as described in wireless network access point, it is characterized in that, described link capability information transmitting unit, specifically for:

The link capability information that described link capability information determination unit is determined is sent to the described webserver by the signaling between described wireless network access point and the described webserver; Or

The link capability information determined by described link capability information determination unit, by the signaling between described wireless network access point and intermediate network node, sends to described intermediate network node, passes to the described webserver by described intermediate network node.

13. as arbitrary in claim 9-11 as described in wireless network access point, it is characterized in that, described link capability information transmitting unit, specifically for:

The link capability information that described link capability information determination unit is determined is carried on described mobile terminal send in the packet of the described webserver, sends to the described webserver.

14. 1 kinds of webservers, is characterized in that, comprising:

Link capability information receiving unit, for receiving the link capability information that wireless network access point sends; Wherein, described link capability information is that described wireless network access point detects that the mobile terminal of the described webserver and the described wireless network access point of access is set up and to determine when transmission control protocol TCP is connected and to send;

Best congestion window determining unit, for the link capability information received according to described link capability information receiving unit, determines the size of best congestion window;

Adjustment unit, for the size of best congestion window determined according to described best congestion window determining unit, adjusts current congestion window.

15. webservers as claimed in claim 14, it is characterized in that, described link capability information is:

The wireless throughput information of described mobile terminal.

16. webservers as claimed in claim 15, is characterized in that, described best congestion window determining unit, specifically for:

The size of best congestion window is determined according to following formula:

CWNDopt＝RTT×Throughput/SegmentSize；

Wherein, CWNDopt is the size of best congestion window;

RTT is the round-trip delay of the described webserver to described mobile terminal transmission packet;

Throughput is the wireless throughput information of described mobile terminal;

SegmentSize is the size of the packet that the described webserver transmits to described mobile terminal.

The adjustment System of 17. 1 kinds of congestion windows, is characterized in that, comprising: the webserver and wireless network access point, wherein:

Described wireless network access point, for detect the webserver and access described wireless network access point mobile terminal set up transmission control protocol TCP be connected time, determine the link capability information of the wireless link between the described webserver and described mobile terminal; The link capability information determined is sent to the described webserver;

The described webserver, for receive described wireless network access point send link capability information after, according to the link capability information that described wireless network access point sends, determine the size of best congestion window; And according to the size of described best congestion window, current congestion window is adjusted.