CN102263618A - Method, device and system for controlling wireless network congestion - Google Patents
Method, device and system for controlling wireless network congestion Download PDFInfo
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- CN102263618A CN102263618A CN2010101954911A CN201010195491A CN102263618A CN 102263618 A CN102263618 A CN 102263618A CN 2010101954911 A CN2010101954911 A CN 2010101954911A CN 201010195491 A CN201010195491 A CN 201010195491A CN 102263618 A CN102263618 A CN 102263618A
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Abstract
The invention provides a method, device and system for controlling wireless network congestion. The method comprises the following steps: analyzing received data packets to obtain confirmation packets; monitoring a transmission capacity parameter of a wireless channel in real time, and determining the number of to-be-split confirmation packets in accordance with the value of the transmission capacity parameter and the number of the data packets, wherein the sum of the number of the data packets and the number of the to-be-split confirmation packets is less than or equal to the value of the transmission capacity parameter; and splitting the confirmation packets in accordance with the number of the to-be-split confirmation packets and sending the split confirmation packets to a server based on a sliding window protocol. According to the invention, the network congestion which is caused by slow window increment under the condition of good channel conditions is avoided or the packet loss which is caused by the overexpansion of a sending window under the condition of bad channel conditions can be avoided.
Description
Technical field
The present invention relates to the congested control of wireless communication field, be specifically related to a kind of wireless network congestion control method and device.
Background technology
The construction of wireless network at present begins to take shape, and its user also begins explosive growth, for the transfer of data demand that grows with each passing day, requires transmission resource management intelligence more.Because the wireless transmission environmental change is fast and the uncertain time delay of wired side, sliding window protocol, can not adapt to wireless environment effectively as transmission control protocol (TransportControl Protocol is abbreviated as TCP) agreement, influence effective utilization and user's impression of Radio Resource.Existing improvement project, as TCP performance boost algorithm (TCPPerformance Enhance, be abbreviated as the TPE algorithm), be at radio network controller (RadioNetwork Control, be abbreviated as RNC) TCP proxy module of middle increase, the part transfer function of simulation TCP to quicken slow toggle speed and retransmission efficiency, promotes the algorithm arrangement that TCP counts transfer performance in the wireless network thereby reach.The specific explanations of TPE algorithm is as follows: RNC receives core net (Core Net, be abbreviated as CN) send through the packet behind the TCP/IP group bag, and these packets are resolved, extract protocol Data Unit (the Protocol Data Unit of TCP layer, be abbreviated as PDU), to affirmation (Acknowledge wherein, be abbreviated as ACK) bag or the packet of ACK incidentally, adopt the TCP performance enhancement techniques of division ACK bag, promptly by the number of division ACK bag with increase ACK bag, and the ACK after will dividing bag be sent to data based on the server of sliding window protocol to increase data in server send window based on sliding window protocol, thereby promote transmitting capacity based on the server of sliding window protocol, and then slow start-up course in the acceleration TCP number of plies biography process, avoid data congestion, reach the effect that reduces packet loss and propagation delay time.
The TPE algorithm continue slow the startup stage oversize and the problem network congestion that causes though can improve, but it adopts preset parameter configuration ACK bag division number purpose method to increase ACK bag number, make that the number of ACK bag division can not fast adaptation wireless channel and receiving ability, Hypersegmentation may appear thus, cause send window expansion too fast make traffic carrying capacity the eat dishes without rice or wine throughput much larger than channel of TCP based on the server of sliding window protocol, or divide insufficiently, can't maximize and improve network congestion; Or TCP proxy caching space is limited, and still carries out the division of ACK bag, causes buffer memory to overflow and then packet loss.
Summary of the invention
First purpose of the present invention is to propose a kind of valid wireless method for controlling network congestion.
Second purpose of the present invention is to propose a kind of valid wireless network congestion control device.
For realizing above-mentioned first purpose, the invention provides a kind of wireless network congestion control method, comprising: the packet of receiving is resolved obtain confirming bag; The transmittability parameter of real time monitoring wireless channel, and determine to confirm the number to be divided of bag according to the value of transmittability parameter and quantity of data packets, wherein, quantity of data packets with confirm bag wait to divide the value that the number sum is less than or equal to the transmittability parameter; Carry out splitting operation according to waiting to divide number to confirming bag, and the affirmation bag after will dividing is sent to the server based on sliding window protocol.
For realizing above-mentioned second purpose, the invention provides a kind of wireless network congestion control device, comprising: parsing module is used for the packet of receiving resolved and obtains confirming bag; Monitoring module is used for the transmittability parameter of real time monitoring wireless channel; Processing module is used for determining to confirm according to the value of transmittability parameter and quantity of data packets the number to be divided of bag, wherein, quantity of data packets with confirm bag wait to divide the value that the number sum is less than or equal to the transmittability parameter; Carry out splitting operation according to waiting to divide number to confirming bag, and the affirmation bag after will dividing is sent to the server based on sliding window protocol.
The present invention also provides a kind of wireless network congestion control system, comprising: terminal is used to send packet; The wireless network congestion control device is used for packet resolved and obtains confirming bag; And the transmittability parameter of real time monitoring wireless channel, and the number to be divided of determining described affirmation bag according to the value and the described quantity of data packets of described transmittability parameter, wherein, described quantity of data packets and described affirmation bag waits to divide the value that the number sum is less than or equal to described transmittability parameter; And wait to divide number described affirmation bag is carried out splitting operation, and send affirmation bag after the division according to described; Based on the server of sliding window protocol, be used to receive the affirmation bag after this division.
Among each embodiment of the present invention, by monitoring transmittability parameter, dynamically the number of adjustment ACK bag division and then control are based on the purpose of the server transmission rate of sliding window protocol, avoid occurring channel condition when good window increase slow and cause the situation of network congestion, perhaps send window excessive expansion and cause packet loss during bad channel.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention in the lump with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is embodiment one flow chart of wireless network congestion control method of the present invention;
Fig. 2 is embodiment two flow charts of wireless network congestion control method of the present invention;
Fig. 3 is the example structure figure of wireless network congestion control device of the present invention;
Fig. 4 is the example structure figure of wireless network congestion control system of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Method embodiment
Fig. 1 is embodiment one flow chart of wireless network congestion control method of the present invention.As shown in Figure 1, present embodiment comprises:
Step S102: the packet of receiving resolved obtain confirming bag; Specific operation process is explained referring to Fig. 2's;
Step S104: the transmittability parameter of real time monitoring wireless channel, and according to the value of transmittability parameter and the number to be divided of the definite affirmation bag of quantity of data packets, wherein, quantity of data packets with confirm bag wait to divide the value that the number sum is less than or equal to the transmittability parameter; Specific operation process is explained referring to Fig. 2's;
Step S106: carry out splitting operation according to waiting to divide number to confirming bag, and the affirmation bag after will dividing is sent to the server based on sliding window protocol; Specific operation process is explained referring to Fig. 2's.
Present embodiment is by monitoring transmittability parameter, dynamically the number of adjustment ACK bag division and then control are based on the purpose of the server transmission rate of sliding window protocol, avoid occurring channel condition when good window increase slow and cause the situation of network congestion, perhaps send window excessive expansion and cause packet loss during bad channel.
Fig. 2 is embodiment two flow charts of wireless network congestion control method of the present invention.As shown in Figure 2, present embodiment comprises:
Step S202: the packet that terminal is sent is resolved and is obtained confirming bag; Below be the example explanation that makes an explanation among each embodiment with the server of carrying TCP, that is to say that the sliding window protocol in the server among the step S201 is TCP;
Step S204: the transmittability parameter of real time monitoring wireless channel and current spatial cache amount to packet;
Steps A: this transmittability parameter can represent that current channel once dispatches the data volume that can send of eating dishes without rice or wine, and it can also obtain during concrete operations in the following manner by directly monitoring in real time:
A. report the transport quality parameters of wireless channel by the physical layer processing unit of user terminal (promptly sending the terminal of this packet) (Layer 1, is called for short L1), report mode can be the cycle or Event triggered;
B. the transport quality parameters (be channel quality, its indication eats dishes without rice or wine to use the data in much speed emptying buffer memorys) of wireless channel is carried out real-time active monitoring, promptly assess down channel by the up channel transmission quality of monitor user ';
C. after obtaining channel quality according to above-mentioned steps b or c, channel quality be multiply by very (it is for for being not more than 1 percentage than the channel coefficients that obtains, because this channel coefficients is corresponding one by one with channel quality, so this transport quality parameters also can comprise channel coefficients), channel coefficients multiply by once to be dispatched maximum rate (it refers to when channel is fully good, dispatching this user can be from the data volume of eating dishes without rice or wine to launch, the maximum transmitted amount of the wireless channel that promptly prestores) as the speed (being the transmittability parameter) of eating dishes without rice or wine, the buffer memory space that can discharge just;
Step B: monitor the spatial cache among the current TCP agency;
The principle of above-mentioned steps S204 is: the data that the server based on sliding window protocol of packet (promptly carrying the server of Transmission Control Protocol) sends at first will be in the TCP agency buffer memory, so consider buffer status, that is to say, next data volume that sends constantly of server should be considered recipient's receiving ability, avoids sending causing the recipient to receive too much; When considering buffer memory, the factor that specifically needs to consider has: the spatial cache (being the transmittability parameter in the steps A) that the data volume that local cache can hold (being the spatial cache among the current TCP agency among the step B), buffer memory can discharge;
Step S206: the number to be divided of determining to confirm bag according to value, quantity of data packets and the spatial cache amount of transmittability parameter, wherein, quantity of data packets with confirm bag wait divide value and the spatial cache amount sum that the number sum is less than or equal to the transmittability parameter, step S206 can comprise during concrete operations:
When step 1:TCP connected initial start, the congestion window of server was very little, and the current cache amount is zero, at this moment used default maximum can divide number and divided the ACK bag, and transmission rate is raised up, and reached predetermined threshold value until the occupancy of buffer memory;
Step 2: after the rate stabilization, transmitting capacity of comprehensively eating dishes without rice or wine and buffer memory real-time status are dynamically adjusted division ACK bag number, to adjust the transmission rate of server; Specific explanations is as follows: the transmission of eating dishes without rice or wine can make buffer memory release portion space, the data of server transmission next time are the upper limit with the residue that can fill up this buffer memory and the space that can discharge next time, so server is confirmed the data volume upper limit that can send next time according to this tittle, the difference of the transmission data of this upper limit and this server is exactly the maximum number that this ACK bag can divide; During concrete operations, as according to Transmission Control Protocol, receiving terminal needn't all confirm each packet, and the affirmation of the bag of certain sequence number is represented that all data before this bag and this bag have all correctly received, and this helps to save interface-free resources; For example, according to the value of transmittability parameter and quantity of data packets determine to confirm bag wait to divide number the time, if once maximum can send 8K and (is and once dispatches maximum rate, be also referred to as the maximum transmitted amount of wireless channel), channel can correctly transmit 6K and (be eat dishes without rice or wine speed or transmittability parameter at present, correspondingly channel coefficients is 6/8), this server is sent the packet of 3 1K bytes, and then the maximum division number of ACK bag is 6-3=3; If when taking all factors into consideration the factor of current cache amount simultaneously, total buffer as RNC is 16K, taken 12K, then current spatial cache amount is 16-12=4, add RNC at the spatial cache that can discharge, then total spatial cache amount has 4+6=10K, and then the maximum division number of ACK bag is 10-3=7;
Step S208: according to waiting to divide number the ACK bag is carried out splitting operation, and the bag of the ACK after will divide is sent to the server based on TCP, wherein, the division that ACK wraps is similar to nuclear fission; As, according to Transmission Control Protocol, current UE is that 100 bag is confirmed to sequence number, is receiving that the back carries out splitting operation to this affirmations bag, fissioning is that to 98,99, No. 100 bags three confirm that bag ACK wrap; The ACK bag that fission generates is that with the difference of normal ACK bag acknowledged sequence number is different, whether can not distinguish the ACK bag after server is received through fission.
It will be appreciated by those skilled in the art that, the present invention is the division number by the dynamic ACK of determining bag, and divides the send window (promptly sliding window mechanism) of ACK bag to increase agreement according to the division number of determining, and then avoids congested control, can be used for the wireless universal platform, as UMTS etc.; High level data link protocol (High-Level Data Link Control, abbreviation HDLC), Secure Hypertext Transfer Protocol (Secure Hypertext Transfer Protocol, abbreviation HTTPS), local mail host-host protocol (Local Mail Transfer Protocol, be called for short LMTP), and other connection-oriented application, all can be suitable for various embodiments of the present invention, that is to say that all network congestion control based on sliding window protocol can be suitable for various embodiments of the present invention.
Present embodiment is by monitor channel quality and buffer memory occupancy, dynamically adjust the number of ACK bag division, reach the purpose of control based on the server transmission rate of sliding window protocol, avoid occurring channel condition when good window increase slow and cause the situation of network congestion, perhaps the send window excessive expansion causes packet loss during bad channel; Under the ideal state, server can make the buffer memory of receiving terminal remain full of state always and not overflow, and guarantee descendingly has data to send always, and can reduce transmission rate when the channel slip fast, avoids a large amount of packet losses.
Device embodiment
Fig. 3 is the example structure figure of wireless network congestion control device of the present invention.Each embodiment of above-mentioned Fig. 1 and the invention of Fig. 2 method all can realize in the device of structure shown in Fig. 3 structure chart.As shown in Figure 3, this device comprises: parsing module 32 is used for the packet of receiving resolved and obtains confirming bag; Monitoring module 34 is used for the transmittability parameter of real time monitoring wireless channel; Processing module 36 is used for determining to confirm according to the value of transmittability parameter and quantity of data packets the number to be divided of bag, wherein, quantity of data packets with confirm bag wait to divide the value that the number sum is less than or equal to the transmittability parameter; Carry out splitting operation according to waiting to divide number to confirming bag, and the affirmation bag after will dividing is sent to the server based on sliding window protocol of packet.
During concrete operations, this monitoring modular 34 can comprise: monitoring submodule 342 is used for real-time active monitoring or receives the transport quality parameters of the wireless channel that the physical layer processing unit of the transmission terminal of this packet reports; Determine the transmittability parameter according to the transport quality parameters and the maximum transmitted amount of the wireless channel that prestores; Monitoring submodule 344 is used to monitor current spatial cache amount.
Processing module 36 can comprise: confirm submodule 362, be used for determining the number to be divided that affirmation is wrapped according to the value and the quantity of data packets of transmittability parameter, wherein, quantity of data packets with confirm bag wait to divide the value that the number sum is less than or equal to the transmittability parameter; The value, quantity of data packets and the spatial cache amount that perhaps are used for according to the transmittability parameter are determined the number to be divided that affirmation is wrapped, wherein, quantity of data packets with confirm bag wait to divide value and the spatial cache amount sum that the number sum is less than or equal to the transmittability parameter; Oidiospore module 364 is used for carrying out splitting operation according to waiting to divide number to confirming bag; Send submodule 366, be used for the affirmation bag after the division is sent to server based on sliding window protocol.Need to prove that this wireless network congestion control device can be arranged among the RNC; Can be transmission control protocol based on the sliding window protocol in the server of sliding window protocol.
In the present embodiment, by monitoring modular 34 monitor channel quality and buffer memory occupancy, processing module 36 is dynamically adjusted the number of ACK bag division, reach the purpose of control based on the server transmission rate of sliding window protocol, avoid occurring channel condition when good window increase slow and cause the situation of network congestion, perhaps the send window excessive expansion causes packet loss during bad channel, can make to adapt to wireless network environment better based on sliding window protocol.
System embodiment
Fig. 4 is the example structure figure of wireless network congestion control system of the present invention.Each embodiment of above-mentioned Fig. 1 and the invention of Fig. 2 method all can realize in the system of structure shown in Fig. 4 structure chart.As shown in Figure 4, this system comprises: terminal 40 is used to send packet; Wireless network congestion control device 42 is used for the packet of receiving resolved and obtains confirming bag; And the transmittability parameter of real time monitoring wireless channel, and according to the value of transmittability parameter and the number to be divided of the definite affirmation bag of quantity of data packets, wherein, quantity of data packets with confirm bag wait to divide the value that the number sum is less than or equal to the transmittability parameter; And carry out splitting operation to confirming bag, and send the affirmation bag after this division according to waiting to divide number; Based on the server 44 of sliding window protocol, be used to receive the affirmation bag after this division.
Wherein, this wireless network congestion control device 42 explains referring to the text description of Fig. 3; Should can be for the server in the core net etc. based on the server 44 of sliding window protocol; 42 of terminal 40 and wireless network congestion control devices are connected for wireless network.
In the present embodiment, by wireless network congestion control device 42 monitor channel quality and buffer memory occupancy, dynamically adjust the number of ACK bag division, reach the purpose of control based on server 44 transmission rates of sliding window protocol, avoid occurring channel condition when good window increase slow and cause the situation of network congestion, perhaps the send window excessive expansion causes packet loss during bad channel, can make to adapt to wireless network environment better based on sliding window protocol.
It should be noted that at last: above only is the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a wireless network congestion control method is characterized in that, may further comprise the steps:
The packet of receiving resolved obtain confirming bag;
The transmittability parameter of real time monitoring wireless channel, and the number to be divided of determining described affirmation bag according to the value and the described quantity of data packets of described transmittability parameter, wherein, described quantity of data packets and described affirmation bag waits to divide the value that the number sum is less than or equal to described transmittability parameter;
Wait to divide number described affirmation bag is carried out splitting operation according to described, and the affirmation bag after will dividing is sent to the server based on sliding window protocol.
2. wireless network congestion control method according to claim 1 is characterized in that, the described packet of receiving is resolved obtains confirming that the step of wrapping also comprises afterwards:
Monitor current spatial cache amount.
3. wireless network congestion control method according to claim 2 is characterized in that, described method comprises:
Determine the number to be divided of described affirmation bag according to the value of described transmittability parameter, described quantity of data packets and described spatial cache amount, wherein, described quantity of data packets and described affirmation bag waits to divide value and the described spatial cache amount sum that the number sum is less than or equal to described transmittability parameter.
4. require each described wireless network congestion control method among the 1-3 according to aforesaid right, it is characterized in that the step of the transmittability parameter of described real time monitoring wireless channel comprises:
Monitor or receive the transport quality parameters of the described wireless channel that the physical layer processing unit of the transmission terminal of described packet reports in real time;
Determine described transmittability parameter according to the described transport quality parameters and the maximum transmitted amount of the described wireless channel that prestores.
5. according to claim 2 or 3 described wireless network congestion control methods, it is characterized in that, describedly comprise transmission control protocol, high level data link protocol, Secure Hypertext Transfer Protocol, local mail host-host protocol based on sliding window protocol.
6. a wireless network congestion control device is characterized in that, this device comprises:
Parsing module is used for the packet of receiving resolved and obtains confirming bag;
Monitoring module is used for the transmittability parameter of real time monitoring wireless channel;
Processing module, be used for the number to be divided of determining described affirmation bag according to the value and the described quantity of data packets of described transmittability parameter, wherein, described quantity of data packets and described affirmation bag waits to divide the value that the number sum is less than or equal to described transmittability parameter; Wait to divide number described affirmation bag is carried out splitting operation according to described, and the affirmation bag after will dividing is sent to the server based on sliding window protocol.
7. wireless network congestion control device according to claim 6 is characterized in that, described monitoring module comprises:
Monitoring submodule is used for monitoring in real time or receive the transport quality parameters of the described wireless channel that the physical layer processing unit of the transmission terminal of described packet reports; Determine described transmittability parameter according to the described transport quality parameters and the maximum transmitted amount of the described wireless channel that prestores;
The monitoring submodule is monitored current spatial cache amount.
8. wireless network congestion control device according to claim 7 is characterized in that, described processing module comprises:
Confirm submodule, be used for the number to be divided of determining described affirmation bag according to the value and the described quantity of data packets of described transmittability parameter, wherein, described quantity of data packets and described affirmation bag waits to divide the value that the number sum is less than or equal to described transmittability parameter; Perhaps be used for the value according to described transmittability parameter, described quantity of data packets and described spatial cache amount and determine the number to be divided of described affirmation bag, wherein, described quantity of data packets and described affirmation bag waits to divide value and the described spatial cache amount sum that the number sum is less than or equal to described transmittability parameter;
The oidiospore module is waited to divide number described affirmation bag is carried out splitting operation according to described;
Send submodule, be used for the affirmation bag after the division is sent to described server based on sliding window protocol.
9. require each described wireless network congestion control device among the 6-8 according to aforesaid right, it is characterized in that described device is arranged in the radio network controller.
10. a wireless network congestion control system is characterized in that, this system comprises:
Terminal is used to send packet;
The wireless network congestion control device is used for described packet resolved and obtains confirming bag; And the transmittability parameter of real time monitoring wireless channel, and the number to be divided of determining described affirmation bag according to the value and the described quantity of data packets of described transmittability parameter, wherein, described quantity of data packets and described affirmation bag waits to divide the value that the number sum is less than or equal to described transmittability parameter; And wait to divide number described affirmation bag is carried out splitting operation, and send affirmation bag after the division according to described;
Based on the server of sliding window protocol, be used to receive the affirmation bag after the described division.
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| WO2017193274A1 (en) * | 2016-05-10 | 2017-11-16 | Qualcomm Incorporated | Radio-aware tcp congestion control optimization |
| CN109474444A (en) * | 2017-09-07 | 2019-03-15 | 中国移动通信有限公司研究院 | A kind of method of adjustment and adjustment equipment of transmission control protocol TCP window |
| CN111615148A (en) * | 2020-05-18 | 2020-09-01 | 京信通信系统（中国）有限公司 | Base station TCP data transmission processing method and device and base station |
| CN112839308A (en) * | 2019-11-25 | 2021-05-25 | 成都鼎桥通信技术有限公司 | Data processing method, device and storage medium |
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| CN111615148B (en) * | 2020-05-18 | 2023-09-26 | 京信网络系统股份有限公司 | Base station TCP data transmission processing method and device and base station |
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