CN102263618B - 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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- CN102263618B CN102263618B CN201010195491.1A CN201010195491A CN102263618B CN 102263618 B CN102263618 B CN 102263618B CN 201010195491 A CN201010195491 A CN 201010195491A CN 102263618 B CN102263618 B CN 102263618B
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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 congestion 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 starts explosive growth, and the transfer of data demand for growing with each passing day, requires transmission resource management more intelligent.Because wireless transmission environmental change is fast and the uncertain time delay of wired side, sliding window protocol, as transmission control protocol (TransportControl Protocol, is abbreviated as TCP) agreement can not adapt to wireless environment effectively, affect effective utilization and user's impression of Radio Resource.Existing improvement project, as TCP performance boost algorithm (TCPPerformance Enhance, be abbreviated as TPE algorithm), at radio network controller (RadioNetwork Control, be abbreviated as RNC) a TCP proxy module of middle increase, the part transfer function of simulation TCP, to accelerate slow toggle speed and retransmission efficiency, promotes thereby reach the algorithm arrangement that in wireless network, TCP counts transfer performance.The specific explanations of TPE algorithm is as follows: RNC receives core net (Core Net, be abbreviated as CN) packet after TCP/IP group bag sent, and these packets are resolved, extract protocol Data Unit (the Protocol Data Unit of TCP layer, be abbreviated as PDU), to confirmation (Acknowledge wherein, be abbreviated as ACK) bag or the packet of ACK incidentally, adopt the TCP performance enhancement techniques of division ACK bag, by division ACK, wrap to increase the number of ACK bag, and the ACK bag after division is sent to the server of data based on sliding window protocol to increase the data transmission window of the server based on sliding window protocol, thereby promote the transmitting capacity of the server based on sliding window protocol, and then slow start-up course in acceleration TCP number of plies biography process, avoid data congestion, reach the effect that reduces packet loss and propagation delay time.
Although TPE algorithm can improve slow start stage and continue problem oversize and network congestion that cause, but it adopts preset parameter configuration ACK bag division number object method to increase ACK bag number, make the number of ACK bag division can not adapt to fast wireless channel and receiving ability, may there is Hypersegmentation thus, cause the too fast traffic carrying capacity that makes of send window expansion of the server of TCP based on sliding window protocol much larger than the throughput of eating dishes without rice or wine of channel, or divide insufficiently, cannot maximize and improve network congestion; Or TCP proxy caching limited space, and still carry out the division of ACK bag, cause cache overflow and then packet loss.
Summary of the invention
The first object of the present invention is to propose a kind of valid wireless method for controlling network congestion.
The second object of the present invention is to propose a kind of valid wireless network congestion control device.
For realizing above-mentioned the first object, the invention provides a kind of wireless network congestion control method, comprising: the packet of receiving is resolved and is confirmed bag; The transmittability parameter of real time monitoring wireless channel, and according to the quantity of the value of transmittability parameter and packet, determine the number to be divided of confirming bag, wherein, the number sum to be divided of the quantity of packet and confirmation bag is less than or equal to the value of transmittability parameter; According to number to be divided, to confirming bag, carry out splitting operation, and the confirmation bag after division is sent to the server based on sliding window protocol.
For realizing above-mentioned the second object, the invention provides a kind of Wireless network congestion control device, comprising: parsing module, for the packet of receiving is resolved and is confirmed bag; Monitoring module, for the transmittability parameter of real time monitoring wireless channel; Processing module, for determine the number to be divided of confirming bag according to the quantity of the value of transmittability parameter and packet, wherein, the number sum to be divided of the quantity of packet and confirmation bag is less than or equal to the value of transmittability parameter; According to number to be divided, to confirming bag, carry out splitting operation, and the confirmation bag after division 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, for sending packet; Wireless network congestion control device, for resolving and be confirmed bag packet; And the transmittability parameter of real time monitoring wireless channel, and according to the quantity of the value of described transmittability parameter and described packet, determine the number to be divided of described confirmation bag, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter; And according to number described to be divided, described confirmation bag is carried out to splitting operation, and send the confirmation bag after division; Server based on sliding window protocol, for receiving the confirmation bag after this division.
In each embodiment of the present invention, by monitoring transmittability parameter, dynamically adjust the number of ACK bag division and then the object of the server transmission rate of control based on sliding window protocol, avoid occurring window when channel condition is good to increase slow and cause the situation of network congestion, or send window excessive expansion and cause packet loss during bad channel.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification,, in the lump for explaining the present invention, is not construed as limiting the invention with embodiments of the invention.In the accompanying drawings:
Fig. 1 is embodiment mono-flow chart of wireless network congestion control method of the present invention;
Fig. 2 is embodiment bis-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 for description and interpretation the present invention, is not intended to limit the present invention.
Embodiment of the method
Fig. 1 is embodiment mono-flow chart of wireless network congestion control method of the present invention.As shown in Figure 1, the present embodiment comprises:
Step S102: the packet of receiving is resolved and is confirmed bag; Specific operation process is explained referring to Fig. 2's;
Step S104: the transmittability parameter of real time monitoring wireless channel, and determine according to the quantity of the value of transmittability parameter and packet the number to be divided that confirmation is wrapped, wherein, the quantity of packet is less than or equal to the value of transmittability parameter with confirming the number sum to be divided of wrapping; Specific operation process is explained referring to Fig. 2's;
Step S106: carry out splitting operation according to number to be divided to confirming bag, and the confirmation bag after division is sent to the server based on sliding window protocol; Specific operation process is explained referring to Fig. 2's.
The present embodiment is by monitoring transmittability parameter, dynamically adjust the number of ACK bag division and then the object of the server transmission rate of control based on sliding window protocol, avoid occurring window when channel condition is good to increase slow and cause the situation of network congestion, or send window excessive expansion and cause packet loss during bad channel.
Fig. 2 is embodiment bis-flow charts of wireless network congestion control method of the present invention.As shown in Figure 2, the present embodiment comprises:
Step S202: the packet that terminal is sent is resolved and is confirmed bag; In following embodiment, take carrying TCP server as example explains, that is to say that the sliding window protocol in the server in step S201 is TCP;
Step S204: the transmittability parameter of real time monitoring wireless channel and the 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 pass through direct Real-Time Monitoring, can also obtain in the following manner during concrete operations:
A. by the physical layer processing unit of user terminal (sending the terminal of this packet) (Layer 1, is called for short L1), reported the transport quality parameters of wireless channel, report mode can be the cycle or Event triggered;
B. the transport quality parameters of wireless channel (be channel quality, its indication eats dishes without rice or wine to use the data in the emptying buffer memory of much speed) is carried out to real-time active monitoring, by the up channel transmission quality of monitor user ', assess down channel;
C. according to above-mentioned steps b or c, obtain after channel quality, channel quality is multiplied by very to (it is for for being not more than 1 percentage than the channel coefficients obtaining, because this channel coefficients is corresponding one by one with channel quality, therefore this transport quality parameters also can comprise channel coefficients), channel coefficients is multiplied 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 prestoring) as radio interface rate (being transmittability parameter), the space that namely buffer memory can discharge;
Step B: monitor the spatial cache in current TCP agency;
The principle of above-mentioned steps S204 is: the data that the server based on sliding window protocol of packet (carrying the server of Transmission Control Protocol) sends first will be in TCP agency buffer memory, so consider buffer status, that is to say, next data volume constantly sending of server should be considered recipient's receiving ability, avoids sending causing too much recipient to receive; While considering buffer memory, specifically need to consider because have: the spatial cache (being the transmittability parameter in steps A) that the data volume that local cache can hold (being the spatial cache in the current TCP agency in step B), buffer memory can discharge;
Step S206: determine the number to be divided of confirming bag according to the quantity of the value of transmittability parameter, packet and spatial cache amount, wherein, the quantity of packet is less than or equal to value and the spatial cache amount sum of transmittability parameter with confirming the number sum to be divided of wrapping, and during concrete operations, step S206 can comprise:
When step 1:TCP connects initial start, the congestion window of server is very little, and current cache amount is zero, at this moment by default maximum, can divide number and divide ACK bag, makes fast transmission rate raise up, until the occupancy of buffer memory reaches predetermined threshold value;
Step 2: after rate stabilization, the 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, it is the upper limit that the data that server next time sends be take the space that can fill up the residue of this buffer memory and can discharge next time, so server confirms according to this tittle the data volume upper limit that can send next time, 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 be confirmed each packet, and the confirmation of the bag of certain sequence number is represented to all data before this bag and this bag have all correctly received, and this contributes to save interface-free resources; For example, according to the quantity of the value of transmittability parameter and packet determine to confirm bag when dividing number, if once maximum can send 8K and (is and once dispatches maximum rate, maximum transmitted amount also referred to as wireless channel), channel can correctly transmit 6K and (be radio interface rate or transmittability parameter at present, correspondingly channel coefficients is 6/8), this server is sent the packet of 3 1K bytes, and to wrap maximum division number be 6-3=3 to ACK; If while considering the factor of current cache amount simultaneously, if the total buffer of RNC is 16K, taken 12K, current spatial cache amount is 16-12=4, add RNC at the spatial cache that can discharge, total spatial cache amount has 4+6=10K, and to wrap maximum division number be 10-3=7 to ACK;
Step S208: according to number to be divided, ACK bag is carried out to splitting operation, and the ACK bag after division is sent to the server based on TCP, wherein, the division of ACK bag is similar to nuclear fission; As, according to Transmission Control Protocol, the bag that current UE is 100 to sequence number is confirmed, after receiving, this confirmation bag is carried out to splitting operation, fissions as confirming bag ACK bag to three of 98,99, No. 100 bags; The ACK bag that fission generates is that from the difference of normal ACK bag acknowledged sequence number is different, and whether server can not distinguish ACK bag through fission after receiving.
It will be appreciated by those skilled in the art that, the present invention is by the division number of the dynamic ACK of determining bag, and divides according to definite division number the send window (i.e. sliding window mechanism) that ACK wraps to increase agreement, and then avoid congestion is controlled, can be for 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.
The present embodiment is by monitor channel quality and buffer memory occupancy, dynamically adjust the number of ACK bag division, reach the object of controlling the server transmission rate based on sliding window protocol, avoid occurring window when channel condition is good to increase slow and cause the situation of network congestion, or send window excessive expansion causes packet loss during bad channel; Under ideal state, server can make the buffer memory of receiving terminal remain full of state and not overflow always, and guarantee descendingly has data to send always, and can fast reducing transmission rate when channel slip, 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, for the packet of receiving is resolved and is confirmed bag; Monitoring module 34, for the transmittability parameter of real time monitoring wireless channel; Processing module 36, for determine the number to be divided of confirming bag according to the quantity of the value of transmittability parameter and packet, wherein, the number sum to be divided of the quantity of packet and confirmation bag is less than or equal to the value of transmittability parameter; According to number to be divided, to confirming bag, carry out splitting operation, and the confirmation bag after division is sent to the server based on sliding window protocol of packet.
During concrete operations, this monitoring modular 34 can comprise: monitoring submodule 342, in real time active monitoring or receive the transport quality parameters of the wireless channel that the physical layer processing unit of the transmitting terminal of this packet reports; According to transport quality parameters and the maximum transmitted amount of the wireless channel prestoring, determine transmittability parameter; Monitoring submodule 344, for monitoring current spatial cache amount.
Processing module 36 can comprise: confirm submodule 362, for determine the number to be divided of confirming bag according to the quantity of the value of transmittability parameter and packet, wherein, the quantity of packet is less than or equal to the value of transmittability parameter with confirming the number sum to be divided of wrapping; Or for determining according to the quantity of the value of transmittability parameter, packet and spatial cache amount the number to be divided of confirming bag, wherein, the quantity of packet is less than or equal to value and the spatial cache amount sum of transmittability parameter with confirming the number sum to be divided of wrapping; Oidiospore module 364, for carrying out splitting operation according to number to be divided to confirming bag; Send submodule 366, for the confirmation bag after division is sent to the server based on sliding window protocol.It should be noted that, this Wireless network congestion control device can be arranged in RNC; Sliding window protocol in server based on sliding window protocol can be transmission control 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 object of controlling the server transmission rate based on sliding window protocol, avoid occurring window when channel condition is good to increase slow and cause the situation of network congestion, or send window excessive expansion causes packet loss during bad channel, can make to adapt to better wireless network environment 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, for sending packet; Wireless network congestion control device 42, for resolving and be confirmed bag the packet of receiving; And the transmittability parameter of real time monitoring wireless channel, and determine according to the quantity of the value of transmittability parameter and packet the number to be divided that confirmation is wrapped, wherein, the quantity of packet is less than or equal to the value of transmittability parameter with confirming the number sum to be divided of wrapping; And to confirming bag, carry out splitting operation according to number to be divided, and send the confirmation bag after this division; Server 44 based on sliding window protocol, for receiving the confirmation bag after this division.
Wherein, this Wireless network congestion control device 42 explains referring to the text description of Fig. 3; Server 44 that should be based on sliding window protocol can be for the server in core net etc.; 42 of terminal 40 and Wireless network congestion control device 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 object of controlling server 44 transmission rates based on sliding window protocol, avoid occurring window when channel condition is good to increase slow and cause the situation of network congestion, or send window excessive expansion causes packet loss during bad channel, can make to adapt to better wireless network environment based on sliding window protocol.
Finally it should be noted that: these are only 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, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a wireless network congestion control method, is characterized in that, comprises the following steps:
The packet of receiving is resolved and is confirmed bag;
The transmittability parameter of real time monitoring wireless channel, and according to the quantity of the value of described transmittability parameter and described packet, determine the number to be divided of described confirmation bag, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter;
According to number described to be divided, described confirmation bag is carried out to splitting operation, and the confirmation bag after division is sent to the server based on sliding window protocol;
Wherein, described the packet of receiving resolved after being confirmed the step of bag and also comprised:
Monitor current spatial cache amount;
Wherein, described method comprises:
According to the quantity of the value of described transmittability parameter, described packet and described spatial cache amount, determine the number to be divided of described confirmation bag, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to value and the described spatial cache amount sum of described transmittability parameter;
The step of the transmittability parameter of described real time monitoring wireless channel comprises:
Real-Time Monitoring or receive the transport quality parameters of the described wireless channel that the physical layer processing unit of the transmitting terminal of described packet reports;
According to described transport quality parameters and the maximum transmitted amount of the described wireless channel prestoring, determine described transmittability parameter.
2. wireless network congestion control method according to claim 1, is characterized in that, describedly based on sliding window protocol, comprises transmission control protocol, high level data link protocol, Secure Hypertext Transfer Protocol, local mail host-host protocol.
3. a Wireless network congestion control device, is characterized in that, this device comprises:
Parsing module, for resolving and be confirmed bag the packet of receiving;
Monitoring module, for the transmittability parameter of real time monitoring wireless channel;
Processing module, for determine the number to be divided of described confirmation bag according to the quantity of the value of described transmittability parameter and described packet, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter; According to number described to be divided, described confirmation bag is carried out to splitting operation, and the confirmation bag after division is sent to the server based on sliding window protocol;
Wherein, described monitoring module comprises:
Monitoring submodule, for Real-Time Monitoring or receive the transport quality parameters of the described wireless channel that the physical layer processing unit of the transmitting terminal of described packet reports; According to described transport quality parameters and the maximum transmitted amount of the described wireless channel prestoring, determine described transmittability parameter;
Monitoring submodule, monitors current spatial cache amount;
Wherein, described processing module comprises:
Confirm submodule, for determine the number to be divided of described confirmation bag according to the quantity of the value of described transmittability parameter and described packet, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter; Or for determine the number to be divided of described confirmation bag according to the quantity of the value of described transmittability parameter, described packet and described spatial cache amount, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to value and the described spatial cache amount sum of described transmittability parameter;
Oidiospore module, carries out splitting operation according to number described to be divided to described confirmation bag;
Send submodule, for the confirmation bag after division being sent to the described server based on sliding window protocol.
4. according to the Wireless network congestion control device described in the claims 3, it is characterized in that, described device is arranged in radio network controller.
5. a Wireless network congestion control system, is characterized in that, this system comprises:
Terminal, for sending packet;
Wireless network congestion control device, for resolving and be confirmed bag described packet; And the transmittability parameter of real time monitoring wireless channel, and according to the quantity of the value of described transmittability parameter and described packet, determine the number to be divided of described confirmation bag, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter; And according to number described to be divided, described confirmation bag is carried out to splitting operation, and send the confirmation bag after division;
Server based on sliding window protocol, for receiving the confirmation bag after described division;
Wherein, described Wireless network congestion control device comprises:
Parsing module, for resolving and be confirmed bag the packet of receiving;
Monitoring module, for the transmittability parameter of real time monitoring wireless channel;
Processing module, for determine the number to be divided of described confirmation bag according to the quantity of the value of described transmittability parameter and described packet, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter; According to number described to be divided, described confirmation bag is carried out to splitting operation, and the confirmation bag after division is sent to the server based on sliding window protocol;
Wherein, described monitoring module comprises:
Monitoring submodule, for Real-Time Monitoring or receive the transport quality parameters of the described wireless channel that the physical layer processing unit of the transmitting terminal of described packet reports; According to described transport quality parameters and the maximum transmitted amount of the described wireless channel prestoring, determine described transmittability parameter;
Monitoring submodule, monitors current spatial cache amount;
Wherein, described processing module comprises:
Confirm submodule, for determine the number to be divided of described confirmation bag according to the quantity of the value of described transmittability parameter and described packet, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to the value of described transmittability parameter; Or for determine the number to be divided of described confirmation bag according to the quantity of the value of described transmittability parameter, described packet and described spatial cache amount, wherein, the number sum to be divided of the quantity of described packet and described confirmation bag is less than or equal to value and the described spatial cache amount sum of described transmittability parameter;
Oidiospore module, carries out splitting operation according to number described to be divided to described confirmation bag;
Send submodule, for the confirmation bag after division being sent to the described server based on sliding window protocol.
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| WO2017193274A1 (en) * | 2016-05-10 | 2017-11-16 | Qualcomm Incorporated | Radio-aware tcp congestion control optimization |
| CN106411774A (en) * | 2016-09-06 | 2017-02-15 | 联动优势科技有限公司 | Method and device for controlling transaction data volume |
| CN106446067B (en) * | 2016-09-06 | 2020-02-18 | 联动优势科技有限公司 | Method and device for acquiring transaction data |
| 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 |
| CN112839308B (en) * | 2019-11-25 | 2022-06-03 | 成都鼎桥通信技术有限公司 | Data processing method, device and storage medium |
| 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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