CN100486249C - Method for adjusting transmission control protocol receive window - Google Patents
Method for adjusting transmission control protocol receive window Download PDFInfo
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- CN100486249C CN100486249C CNB200510059385XA CN200510059385A CN100486249C CN 100486249 C CN100486249 C CN 100486249C CN B200510059385X A CNB200510059385X A CN B200510059385XA CN 200510059385 A CN200510059385 A CN 200510059385A CN 100486249 C CN100486249 C CN 100486249C
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Abstract
The invention discloses a method for adjusting TOP receiving window, which at least comprises the following steps: a) computing the transmitting control protocol TCP min receiving window; b) adjusting the TCP initial receiving window into the TCP min receiving window. The SGSN can adjust the TCP receiving window by the grid band wide of the user.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) the network system communication technology, the method for particularly a kind of adjustment transmission control protocol (TCP) receive window.
Background technology
TCP be a kind of based on Internet protocol (IP) the connection transmission control protocol arranged, it is based on, and the transmission feature of fixed network system designs, and network transfer delay had the hypothesis of low time delay.
For making full use of the transfer resource that network system provides, improve the transmittability of network system as far as possible, the transmission feature of TCP generally should meet following formula:
Receive buffer memory〉network bandwidth * network round-trip delay (RTT)
But, the situation of buffer memory less than the network bandwidth and RTT product may appear receiving when actual transmissions, when receiving buffer memory less than the product of the network bandwidth and RTT:
The transmission rate of TCP=reception buffer memory/RTT
The WCDMA network system has the characteristics of high time delay as a kind of network system in the 3G (Third Generation) Moblie technology in transmission course, the product of general networking bandwidth and RTT is also bigger.
When existing TCP used on fixed network, because the low time delay of fixed network, it receives buffer memory can not cause the speed bottleneck.But when existing TCP used on the such high-speed radio transmission network of WCDMA, because the intrinsic high time delay characteristics of wireless transmission, the Internet resources that cause the WCDMA network system to provide can't be fully used, and the transmission rate of WCDMA network system is lower.
In the present circumstance, when TCP uses on the WCDMA network system, be used to show that network receives the TCP receive window of cache size, its default value is 16384 bytes, and that the WCDMA network system offers user's network bandwidth development is very fast, generally all more than 384Kbps.The WCDMA network system offers that mobile subscriber's the network bandwidth of 384Kbps is very ripe in commercialization, and the network bandwidth agreement of 2M supports also that very early the network bandwidth that later HSDPA may support will be bigger, and the transmission rate of realization will be higher also.
Because at present to offer user's the network bandwidth generally be between 384Kbps～2048Kbps in the WCDMA system, during customer access network, RTT is about 400～450ms end to end in the WCDMA system.The minimum receive window that requires when therefore, using TCP in the WCDMA system generally speaking should for:
384×1000/8×0.4＝19,200bytes；
The maximum receive window that requires should for:
2048×1000/8×0.4＝102,400bytes
And the default value of TCP receive window is 16384bytes, uses default receive window 16384 bytes of TCP obviously can't meet the demands in transmission course, and it is limited in the transmission rate of WCDMA network system:
16384×8/0.4＝327680bps
Make the WCDMA network system when business is provided, produce very big waste like this:
1-327680/384000＝14.6％
1-327680/2048000＝84％
Be that the network bandwidth that the WCDMA network system offers the user has been wasted 14.6%～84%.The Internet resources that this waste provides the WCDMA network system can't be fully used, and the utilization rate of network resource that the WCDMA network system is provided is lower.Simultaneously, because the utilization rate of network resource that the WCDMA network system is provided is lower, also caused the transmission rate of WCDMA network system lower, the user can't obtain desirable express network access rate in the WCDMA network system.
In some cases, the network bandwidth of the actual use of user may be less.For example the actual network bandwidth that uses of user is 64Kbps, the actual TCP receive window that uses of user's this moment is 64Kbps/8 * 0.4=3200bytes, default receive window 16384bytes when being far smaller than TCP and on the WCDMA network, using, the receive window in the time of will wasting TCP in this case again greatly and on the WCDMA network, use.
Summary of the invention
In view of this, the problem that the present invention mainly solves is, a kind of method of the TCP of adjustment receive window is provided, to adjust the TCP receive window according to the network bandwidth of the actual use of user.
For achieving the above object, the invention provides a kind of method of the TCP of adjustment receive window, key is, may further comprise the steps at least:
A, the minimum receive window of calculating transmission control protocol TCP;
B, the size of TCP primary reception window is adjusted into the minimum receive window of described TCP.
In the such scheme, the minimum receive window of described calculating TCP carries out according to following formula: the minimum receive window of the TCP=average round-trip delay value of (actual bandwidth of user applies/8) * network * anti-shake weight.The span of described anti-shake weight is more than or equal to 1.2 and smaller or equal to 1.5.
In the such scheme, further comprise between steps A and the step B: SGSN is kept at the minimum receive window of the TCP that calculates in the self database.
In the such scheme, further comprise between steps A and the step B: user terminal sends the TCP connection request by SGSN to the server tcp protocol stack, after SGSN receives this request, whether analyze this request is the TCP synchronization message: if, then from the TCP synchronization message, obtain the size of TCP primary reception window, and obtain described TCP minimum receive window, execution in step B then; Otherwise, process ends.
In the such scheme, described step B comprises: SGSN judges that TCP primary reception window is whether less than the minimum receive window of described TCP: if then TCP primary reception window is adjusted into the minimum receive window of described TCP; Otherwise, do not adjust TCP primary reception window.
This method further comprises: SGSN judges whether TCP residue receive window is congested: if then do not adjust TCP residue receive window; Otherwise, TCP is remained receive window is adjusted into the minimum receive window of described TCP.
In the such scheme, whether the described TCP of judgement residue receive window congested comprising: judge that TCP residue receive window is whether less than the initial TCP primary reception window and the product of congestion threshold: if it is congested that then TCP remains receive window; Otherwise TCP residue receive window is not congested.
In the such scheme, described congestion threshold is 0.625.
Therefore, the method of this adjustment TCP receive window provided by the invention, by calculating the minimum receive window of TCP, and the size of TCP primary reception window is adjusted into the minimum receive window of described TCP, makes SGSN adjust the TCP receive window according to the network bandwidth of the actual use of user.
Utilize the present invention, SGSN calculates the minimum receive window of TCP according to the network bandwidth of the actual use of user, in the process that TCP consults, SGSN is adjusted into the minimum receive window of described TCP with the size of TCP primary reception window, make the TCP receive window can satisfy the needs of the actual use of the user network bandwidth, and then improved and provide utilization rate of network resource, and saved the receive window when TCP uses on the WCDMA network to the WCDMA network system.
In the process of TCP transmission, SGSN further adjusts TCP current residual receive window according to initial TCP primary reception window, the size of TCP current residual receive window is adjusted into the minimum receive window of described TCP, make TCP current residual receive window also can satisfy the needs of the actual use of the user network bandwidth, and then better improved and provide utilization rate of network resource, and better saved the receive window when TCP uses on the WCDMA network to the WCDMA network system.
Because the present invention has made full use of the Internet resources that the WCDMA network system provides, and has improved the transmission rate of WCDMA network system greatly, the user also can obtain access to netwoks speed at a high speed in the WCDMA network system.
In addition, if the default receive window the when network bandwidth of the actual use of user uses on the WCDMA network greater than TCP, it is big to utilize the present invention TCP primary reception window can be transferred.After transferring TCP primary reception window greatly, the WCDMA network system has just been loosened the requirement to RTT, and lower block error rate (BLER) can partly be provided for the wireless access of network system, thereby increases the user capacity of wireless access on the whole.For example, when TCP primary reception window is adjusted to 32768bytes, when the network bandwidth that the WCDMA system offers the user is 384Kbps, RTT＜32768 * 8/384=683ms; When TCP primary reception window is adjusted to 65535bytes, when the network bandwidth that the WCDMA system offers the user is 384Kbps, RTT＜65535 * 8/384=1365ms.
The default receive window when if the network bandwidth of the actual use of user uses on the WCDMA network less than TCP, utilize the present invention earlier the minimum receive window of TCP be set to a less value, and it is also little according to the minimum receive window of the TCP that is provided with TCP primary reception window to be adjusted into the window value more default than network system, thereby uses receive window when saving TCP under the less situation of the network bandwidth and using the user on the WCDMA network.For example when the user uses 64Kbps professional, it is 64Kbps/8 * 0.4=3200bytes that the minimum receive window of TCP can be set, this value is far smaller than the default window value 16384bytes of network system, has so just saved the receive window when TCP uses on the WCDMA network greatly.
Description of drawings
Fig. 1 adjusts the method flow diagram of TCP receive window overall technological scheme for the present invention;
Fig. 2 is a method flow diagram of adjusting the TCP receive window according to one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples, and with reference to accompanying drawing, the present invention is described in more detail.
Core content of the present invention is: by calculating the minimum receive window of TCP, and the size of TCP primary reception window is adjusted into the minimum receive window of described TCP, makes SGSN adjust the TCP receive window according to the network bandwidth of the actual use of user.
The present invention needs the SGSN of pre-configured WCDMA network system.When the SGSN of configuration WCDMA network system, generally be that the software on the existing SGSN is upgraded, after upgrading was finished, SGSN can calculate the minimum receive window of TCP according to the actual bandwidth of user applies, and the size of TCP primary reception window is adjusted into the minimum receive window of described TCP.
As shown in Figure 1, Fig. 1 adjusts the method flow diagram of TCP receive window overall technological scheme for the present invention, and this method may further comprise the steps at least:
Step 101: calculate the minimum receive window of TCP;
Step 102: the size of TCP primary reception window is adjusted into the minimum receive window of described TCP.
When calculating TCP minimum receive window, SGSN can calculate according to the situation of the actual use of the user network bandwidth.When TCP primary reception window was adjusted, SGSN can adjust according to the minimum receive window of described TCP, and SGSN may run into following two kinds of situations when concrete the adjustment:
Default receive window when the first, the network bandwidth of the actual use of user uses on the WCDMA network greater than TCP, need transfer TCP primary reception window big this moment, to increase TCP primary reception window, satisfy the needs of the actual use of the user network bandwidth, make full use of the Internet resources that the WCDMA network system provides;
Default receive window when the second, the network bandwidth of the actual use of user uses on the WCDMA network less than TCP, need turn TCP primary reception window down this moment, to reduce TCP primary reception window, satisfy the needs of the actual use of the user network bandwidth, the receive window when saving TCP uses on the WCDMA network.
In actual applications, above-mentioned first kind of situation is general more common, and the general chance that occurs of above-mentioned second kind of situation is less relatively.Below be example just with above-mentioned first kind of situation, introduce technical scheme provided by the invention in detail.
As shown in Figure 2, Fig. 2 is a method flow diagram of adjusting the TCP receive window according to one embodiment of the invention, and this method may further comprise the steps:
Step 201: the user sends packet data protocol (PDP) to the SGSN of WCDMA network system and activates request before setting up the TCP connection.
Step 202:SGSN is after receiving that PDP activates request, according to formula " the minimum receive window of the TCP=average round-trip delay value of (actual bandwidth of user applies/8) * network * anti-shake weight (R) ", calculate the minimum receive window of TCP, and the minimum receive window of the TCP that calculates is kept in the self database; Here the span of R is 1.2≤R≤1.5;
Suppose that the average round-trip delay value of network is 0.45S, the actual bandwidth of user applies is 384000bps, R is 1.5, the minimum receive window of TCP=(384000/8) * 0.45 * 1.5=32400bytes then, be 32768bytes after result of calculation being adjusted into 2 whole power, the minimum receive window of the TCP that then calculates is 32768 bytes.
Step 203: the user sends the TCP connection request by SGSN to the SERVER tcp protocol stack, this request is through SGSN the time, whether SGSN analyzes this request is TCP (SYN) message synchronously: if, then from TCP SYN message, obtain the size of TCP primary reception window, and obtain the minimum receive window of described TCP, execution in step 204 then; Otherwise, process ends.
Step 204:SGSN judges that TCP primary reception window in the TCP SYN message is whether less than the minimum receive window of described TCP: if then execution in step 205; Otherwise, execution in step 206.
Step 205:SGSN is adjusted into the minimum receive window of described TCP with the TCP primary reception window in the TCP SYN message.
Step 206:SGSN does not adjust the TCP primary reception window in the TCP SYN message.
Step 207:SGSN sends to the SERVER tcp protocol stack with TCP SYN message, and writes down initial TCP primary reception window;
Under situation about need adjust to TCP primary reception window, be the TCP primary reception window before and after the difference adjustment, the user can be called initial TCP primary reception window to the TCP primary reception window that the SERVER tcp protocol stack sends in the TCP SYN message;
In the present embodiment, TCP primary reception window in the TCP SYN message is 16384bytes, obvious 16384 bytes＜32768 bytes, therefore the TCP primary reception window in the TCP SYN message is adjusted into 32768 bytes, and amended TCP SYN message sent to the SERVER tcp protocol stack, writing down initial TCP primary reception window simultaneously is 16384 bytes.
After step 208:SERVER tcp protocol stack is received TCP SYN message, return TCP sync response (TCP SYN ACK) message to user terminal.
Step 209: after the user receives TCP SYN ACK message, return TCP to the SERVER tcp protocol stack and reply (TCP ACK) message.
Step 210:SERVER tcp protocol stack sends packet X by sending tcp data bag (TCP PACKET) message to the user, and the user returns TCP ACK message by SGSN to the SERVER tcp protocol stack after receiving packet X.
After step 211:SGSN receives the TCP ACK message that the user sends, judge in the TCP ACK message that TCP current residual receive window is whether greater than the initial TCP primary reception window and the product of congestion threshold 0.625: if then execution in step 212; Otherwise, execution in step 213;
Congestion threshold is to determine whether receive window is in a threshold value of congestion state, when TCP current residual receive window during less than the product of initial TCP primary reception window and congestion threshold, the disposal ability of terminal is not enough, think that then receiving terminal is in congestion state, otherwise think that receiving terminal is not congested;
Mainly consider two aspects during to the congestion threshold value: an aspect is in time to find the congestion state of receive window, causes packet loss to prevent window from overflowing; Another aspect is to prevent false congestion state and cause transmission rate to descend;
The size of congestion threshold can change according to the variation of practical application scene in actual applications, and is a more rational value from practical experience 0.625; In the present embodiment, initial TCP primary reception window is 16384 bytes, and congestion threshold is 0.625, and the then initial TCP primary reception window and the product of congestion threshold are: 16384 bytes * 0.625=10240 bytes.
Step 212:SGSN is adjusted into the minimum receive window of described TCP with TCP current residual receive window, and amended TCP ACK message is sent to the SERVER tcp protocol stack.
Step 213:SGSN does not adjust TCP current residual receive window, directly gives the SERVER tcp protocol stack with TCP ACK forwards.
The present invention for this embodiment in, when step 202 is calculated TCP minimum receive window, suppose that the average round-trip delay value of network is 0.45S, the actual bandwidth of user applies is 384000 bps, R is 1.5, in actual applications, the value of these parameters can change according to the variation of actual conditions.When the value of above-mentioned parameter changed, its technical scheme was consistent with technical scheme of the present invention, and technical thought also is identical with technical thought of the present invention, all should be included within protection scope of the present invention.
In addition, the present invention for step 204～206 of this embodiment in, when TCP primary reception window during more than or equal to the minimum receive window of described TCP, SGSN does not adjust the TCP primary reception window in the TCP SYN message.In the case, present embodiment is considered as also the minimum receive window greater than described TCP with TCP current residual receive window in the transmission course, therefore also TCP current residual receive window is not adjusted yet.
In actual applications, under the situation of TCP primary reception window more than or equal to the minimum receive window of described TCP, also may there be the minimum receive window less than described TCP in TCP current residual receive window, and simultaneously again greater than the situation of initial TCP primary reception window and congestion threshold product, still can be adjusted into TCP current residual receive window described TCP minimum receive window according to technical scheme provided by the invention this moment.Such technical scheme belongs to a kind of special case of technical scheme of the present invention, should be included within protection scope of the present invention.
From top embodiment as can be seen, the method of this adjustment TCP receive window provided by the invention, by calculating the minimum receive window of TCP, and the size of TCP primary reception window is adjusted into the minimum receive window of described TCP, make SGSN adjust the TCP receive window according to the network bandwidth of the actual use of user.
Utilize the present invention, SGSN calculates the minimum receive window of TCP according to the network bandwidth of the actual use of user, in the process that TCP consults, SGSN is adjusted into the minimum receive window of described TCP with the size of TCP primary reception window, make the TCP receive window can satisfy the needs of the actual use of the user network bandwidth, and then improved and provide utilization rate of network resource, and saved the receive window when TCP uses on the WCDMA network to the WCDMA network system.
In the process of TCP transmission, SGSN further adjusts TCP current residual receive window according to initial TCP primary reception window, the size of TCP current residual receive window is adjusted into the minimum receive window of described TCP, make TCP current residual receive window also can satisfy the needs of the actual use of the user network bandwidth, and then better improved and provide utilization rate of network resource, and better saved the receive window when TCP uses on the WCDMA network to the WCDMA network system.
In addition, because the present invention has made full use of the Internet resources that the WCDMA network system provides, improved the transmission rate of WCDMA network system greatly, the user also can obtain access to netwoks speed at a high speed in the WCDMA network system.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of method of adjusting transmission control protocol receive window is characterized in that, may further comprise the steps at least:
A, the minimum receive window of calculating transmission control protocol TCP;
B, the size of TCP primary reception window is adjusted into the minimum receive window of described TCP;
The minimum receive window of described calculating TCP is to carry out according to following formula:
The minimum receive window of the TCP=average round-trip delay value of (actual bandwidth of user applies/8) * network * anti-shake weight.
2, method according to claim 1 is characterized in that, the span of described anti-shake weight is more than or equal to 1.2 and smaller or equal to 1.5.
3, method according to claim 1 is characterized in that, further comprises between steps A and the step B:
SGSN is kept at the minimum receive window of the TCP that calculates in the self database.
4, method according to claim 1 is characterized in that, further comprises between steps A and the step B:
User terminal sends the TCP connection request by SGSN to the server tcp protocol stack, after SGSN receives this request, whether analyze this request is the TCP synchronization message: if, then from the TCP synchronization message, obtain the size of TCP primary reception window, and obtain described TCP minimum receive window, execution in step B then; Otherwise, process ends.
5, according to claim 1 or 4 described methods, it is characterized in that described step B comprises:
SGSN judges that TCP primary reception window is whether less than the minimum receive window of described TCP: if then TCP primary reception window is adjusted into the minimum receive window of described TCP; Otherwise, do not adjust TCP primary reception window.
6, method according to claim 5 is characterized in that, this method further comprises:
SGSN judges whether TCP residue receive window is congested: if then do not adjust TCP residue receive window; Otherwise, TCP is remained receive window is adjusted into the minimum receive window of described TCP.
7, method according to claim 6 is characterized in that, whether the described TCP of judgement residue receive window congested comprising:
Judge that TCP residue receive window is whether less than initial TCP primary reception window and the product of congestion threshold: if it is congested that then TCP remains receive window; Otherwise TCP residue receive window is not congested.
8, method according to claim 7 is characterized in that, described congestion threshold is 0.625.
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| CN101162971B (en) * | 2007-10-30 | 2011-09-14 | 华为技术有限公司 | Data transmitting method, equipment and system |
| US8964757B2 (en) | 2009-12-18 | 2015-02-24 | Qualcomm Incorporated | HTTP optimization, multi-homing, mobility and priority |
| CN103098510B (en) * | 2011-08-30 | 2017-06-27 | 华为技术有限公司 | The methods, devices and systems of control data transmission |
| CN103051559B (en) * | 2012-12-28 | 2016-11-23 | 华为技术有限公司 | Data stream reception treating method and apparatus |
| CN104065464B (en) * | 2013-03-18 | 2018-05-08 | 中国移动通信集团公司 | A kind of method and apparatus of the initial window size of adjustment TCP connections |
| CN106576100B (en) * | 2015-03-26 | 2019-08-16 | 华为技术有限公司 | TCP network agent configuration method and device |
| SG11201705572WA (en) | 2015-03-27 | 2017-08-30 | Huawei Tech Co Ltd | Data transmission method, apparatus, and system |
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