CN111866947A - Wireless network transmission optimization method and system based on MEC - Google Patents
Wireless network transmission optimization method and system based on MEC Download PDFInfo
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- CN111866947A CN111866947A CN202010652891.4A CN202010652891A CN111866947A CN 111866947 A CN111866947 A CN 111866947A CN 202010652891 A CN202010652891 A CN 202010652891A CN 111866947 A CN111866947 A CN 111866947A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
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Abstract
The invention provides a wireless network transmission optimization method and a wireless network transmission optimization system based on MEC, wherein the method comprises the following steps: a novel network transmission method is deployed in an MEC server to realize the sectional control of TCP transmission, the server adopts a congestion control mechanism suitable for a wired link, and the MEC forwards the data by adopting a congestion control mechanism suitable for a wireless link; when a wireless link is interfered or interrupted accidentally, the MEC-based cache retransmission mechanism avoids the disadvantages of long-distance retransmission from a server and congestion avoidance triggering, greatly reduces the retransmission delay of a data packet and avoids congestion avoidance reaction at the server end. And the improvement of the end-to-end transmission performance of the network is realized based on a cache retransmission mechanism and a segmented congestion control mechanism of the MEC. The invention solves the problems of adaptation of TCP and different link conditions and low link transmission efficiency caused by instability of a wireless link, and can effectively improve the end-to-end transmission performance of the network.
Description
Technical Field
The invention relates to the field of communication technology and mobile internet, in particular to a method and a system for optimizing wireless network transmission based on MEC.
Background
In the application of wireless connection such as 4G/5G mobile communication, WiFi and the like, the whole link consists of a wired core network and a wireless access network. The wireless network technology provides great potential and brings many challenges, which are related to the link propagation property of the wireless network technology which is easy to be interfered, the wireless link is characterized in that the throughput under the line-of-sight (LOS) condition is very high, but due to some interference factors, the packet LOSs rate is sharply increased under the non line-of-sight (NLOS) condition, the link packet LOSs causes larger time delay through long-distance retransmission, and triggers the sharp drop of a congestion window and a very long congestion recovery period, so that the end-to-end transmission rate is remarkably reduced; in addition, the transmission efficiency of the network depends on the utilization degree of the underlying resources, the current general TCP is designed for the most common wired network, and the TCP is not adaptive to the current general TCP due to different link characteristics, so that the TCP shows a suboptimal state in a wireless network application scene.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, designs a wireless network transmission optimization method and system based on MEC, and realizes the improvement of the end-to-end transmission performance of a network.
In a first aspect, the present invention designs a method for optimizing wireless network transmission based on MEC in a network end-to-end transmission system, which specifically comprises:
the server side sends a data packet with the destination of the client side to a base station side MEC server; the server side adopts a congestion control mechanism suitable for a wired link;
the MEC server sends an Early-ACK confirmation to the server after receiving the message sent by the server, and the received message is cached in the MEC server; the MEC server sends a message to the client; wherein, the MEC server adopts a congestion control mechanism suitable for a wireless link for forwarding;
deleting the cached message when receiving the corresponding ACK returned by the client; when the wireless link is interfered or interrupted accidentally, the client receives the unordered messages and triggers the repeated ACK, and the MEC server performs sequential retransmission on the messages with the returned ACK serial numbers in the cache after detecting the repeated ACK.
Preferably, MEC-TCP uses a transparent transmission mode.
Preferably, MEC-TCP is forwarded by interrupting the socket connection.
Preferably, the MEC-based cache retransmission mechanism performs cache retransmission of the data packet by using a cache function of the MEC server on the base station side.
Preferably, the transmission performance is quantified by network throughput and transmission delay.
In another aspect, the present invention provides an MEC-based wireless network transmission optimization system in a network end-to-end transmission system, where the system includes: the system comprises a server, a base station side MEC server and a client; the server end adopts a wired link to the MEC server at the base station side, and the MEC server at the base station side adopts a wireless link to the client end;
the server sends a data packet with the destination of the client through the MEC server at the base station side; the server side adopts a congestion control mechanism suitable for a wired link;
the MEC server sends an Early-ACK confirmation to the server after receiving the message sent by the server, and the received message is cached in the MEC server; the MEC server sends a message to the client; wherein, the MEC server adopts a congestion control mechanism suitable for a wireless link for forwarding;
deleting the cached message when receiving the corresponding ACK returned by the client; when the wireless link is interfered or interrupted accidentally, the client receives the unordered messages and triggers the repeated ACK, and the MEC server performs sequential retransmission on the messages with the returned ACK serial numbers in the cache after detecting the repeated ACK.
Preferably, the MEC server includes a transmission architecture module, a MEC-based cache retransmission module, and a congestion control module;
the transmission architecture module controls the TCP connection from end to end in a segmented manner so as to realize that the online side and the wireless side use different transmission control algorithms and select to use different transmission control algorithms according to different network link conditions;
the cache retransmission module based on the MEC comprises a message cache and fast retransmission mechanism and a fast response and fast confirmation mechanism;
and the congestion control module realizes the selection and deployment of the TCP congestion control algorithm which is most suitable for the links at the two ends by utilizing the TCP congestion control algorithm.
The invention realizes the sectional control of TCP transmission by deploying a novel network transmission method MEC-TCP in the MEC server, carries out personalized setting on a congestion control algorithm in a wireless network end-to-end system, and realizes reliable transmission of data packets based on a cache retransmission mechanism of the MEC, thereby realizing the improvement of network end-to-end transmission performance, transmission efficiency and reliability.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a topological diagram of an MEC-TCP application scenario;
FIG. 2 is a diagram of an MEC-TCP functional block;
FIG. 3 illustrates a fast response and fast acknowledgement mechanism;
FIG. 4 illustrates a message caching and fast retransmission mechanism;
FIG. 5 is a graph of the effect of MEC-TCP experiment.
Detailed Description
The invention deploys a novel network transmission method MEC-TCP in the MEC server to realize the subsection control of TCP transmission, and realizes the promotion of the end-to-end transmission performance of the network based on the cache retransmission mechanism of the MEC and the subsection congestion control mechanism. For example, during downloading, a server sends a data packet to a client through a base station side MEC server, an MEC-TCP deployed on the MEC server forwards the data packet in a transparent transmission mode, the server adopts a congestion control mechanism suitable for a wired link, and the MEC server forwards the data packet by adopting a congestion control mechanism suitable for a wireless link; when a wireless link is interfered or interrupted accidentally, the MEC-based cache retransmission mechanism avoids the defects of long-distance retransmission and congestion triggering avoidance from a server, can greatly reduce the retransmission delay of a data packet, and obviously improves the end-to-end transmission rate.
According to one aspect of the invention, an MEC-TCP based wireless network transmission optimization method is provided, and an application scenario topology diagram is shown in fig. 1.
The method is deployed in a common wireless network transmission scene, and a sending end sends a data packet to a receiving end through a core network, an MEC server and a wireless link. In the process, the MEC-TCP is deployed and operated on the MEC server to realize transparent transmission of the data packets, the sending end and the receiving end are noninductive to the process, and the sending end and the receiving end do not need to be modified. The reliable transmission mechanism based on the MEC utilizes the storage and calculation functions of the MEC server to cache and forward the real-time data packet so as to retransmit the real-time data packet in time when the wireless link loses the packet; the MEC-TCP simultaneously realizes the selection function of the segmented congestion control algorithm, and the congestion control algorithm suitable for different link conditions can be selected before transmission begins. Therefore, the effect of transmission optimization is achieved.
The functions of the various modules of the transmission method deployed in the MEC server are shown in fig. 2;
the functions of the various modules are described as follows:
1. a transmission architecture module: the method is used for dividing TCP connection of an end-to-end link into two sections of connection of a wired network and a wireless network, and designing proper transmission control algorithms for different link conditions.
In the traditional end-to-end transmission system, the same congestion control algorithm is adopted on two links from a server to a client, and the realization method of the invention is to distinguish the whole end-to-end link into a wired side and a wireless side, thereby realizing differentiated control on different link conditions at the two sides.
The function is realized in a transmission layer, an MEC server intercepts TCP stream sent by a server side by utilizing a mechanism similar to a network agent, and forwards the intercepted TCP stream to a client side through a transparent transmission mechanism, namely, the intercepted TCP stream is divided into two sections of TCP connections which are independently controlled. The whole process is not sensitive to the client and the server, and the function is realized without special operation on two ends.
2. Congestion control module based on segmented transmission
For a traditional wireless network end-to-end link, a TCP connection is divided into two sections of connections, namely a wired network and a wireless network, but the traditional end-to-end link cannot implement differentiated control of a congestion control algorithm during the two sections of connections, so that a transmission bottleneck problem occurs in a heterogeneous network with large link condition difference. The module is designed and selected to optimize a suitable congestion transmission control algorithm for different link conditions of two-segment connection in order to solve the problem.
Specifically, after the MEC-TCP is intercepted, the data stream downloaded from the server can be forwarded and controlled by adopting a congestion control algorithm suitable for a wireless link environment; for the data stream uploaded from the client, after the MEC-TCP is intercepted, the congestion control algorithm suitable for the wired link environment can be adopted for forwarding control.
The key function for realizing the forwarding CONGESTION transmission control algorithm is setsockopt (), and the TCP _ CONGESTION parameter of the socket at the server end can be set by setsockopt (), the setsockopt () function has many socket options of a common TCP layer, and usually only some necessary functions are defined in use, the TCP _ CONGESTION is taken as a specific option, and we add and define the parameter variable under the function.
The function is to get or set the option associated with a socket. Options may be located in a multi-layer approach, which always appear at the uppermost socket layer. When operating a socket option, the layer in which the option is located and the name of the option must be given. For example, to indicate that an option is resolved by the TCP method, the layer should be set to method number TCP.
The setsockopt () function data structure is as follows:
after the segmented control of the congestion transmission control algorithm is realized, the existing different congestion control algorithms can be selected or a new congestion control algorithm can be designed according to the actual different link conditions.
3. A reliable transmission module: the method mainly comprises a quick response and quick confirmation mechanism, a message cache and a quick retransmission mechanism.
The fast acknowledgement mechanism is to utilize the MEC server to implement a fast response to the server connection request. Because the round-trip delay of an end-to-end link from a server to a client is usually large, when a connection is established in a TCP under a traditional transmission architecture, three times of handshake all need to pass through the end-to-end link with long delay, and long delay is consumed. In addition, the TCP adopts a flow control mechanism in which the server and the client are synchronized, the congestion window of the server increases depending on an ACK acknowledgement packet returned by the mobile terminal, and the increase of the congestion window is influenced by the return delay of the ACK.
The quick response and quick confirmation mechanism is designed in the MEC server, and directly gives a response to a TCP connection request initiated by the server, namely the MEC server sends Early-ACK immediate confirmation to the server after receiving a message, and the received message sent by the server is firstly cached in the MEC server. And under the condition that the server of the base station MEC has storage space, Early-ACK is sent to the server, and the server does not reduce the sending rate at the moment, so that the end-to-end transmission performance is obviously improved.
The quick response and quick acknowledgement mechanism is shown in fig. 3, after receiving a message, the MEC server sends an Early-ACK immediate acknowledgement to the server, and the received message sent by the server is cached in the MEC server. And deleting the cached message when the MEC server receives the corresponding ACK from the client.
The message caching and fast retransmitting mechanism utilizes the storage function of the MEC server to cache the message, so that when the message is lost in a wireless link, the lost message can be directly retransmitted from the MEC server cache without being retransmitted from a data source end. Because the error rate of the wireless link is high, packet loss is easy to occur, once packet loss occurs, if retransmission is carried out from a data source end, long time delay is needed, the MEC server is close to the mobile terminal, and if retransmission is directly carried out from the cache of the MEC server, the retransmission time is greatly shortened.
The message caching and fast retransmission mechanism is shown in fig. 4, and the MEC server deletes the cached message when receiving the corresponding ACK from the client. When the wireless link state fluctuation causes the loss of part of the messages, the client receives the messages out of order, and therefore repeated ACK can be triggered. When the MEC server detects the repeated ACK, it actively retransmits the packet after the returned ACK sequence from the cache in order to reduce packet loss recovery delay.
The specific embodiment of the invention is based on research and development under a Linux operating system.
The method system is deployed on the MEC server, and before the system is started, a congestion control method to be used can be selected in a macro definition stage, and then iptables and route are configured. iptables and route are tool components working in user space for defining rules to enable transparent transmission between a sending end and a receiving end.
For convenience of description, in this embodiment, it is assumed that the IP of the server is 10.0.0.1, the IP of the network card of the MEC server close to the server is 10.0.0.2 (the two may be in the same network segment), and the network card IP of the MEC server close to the receiving end and the IP of the receiving end are dynamically allocated by the base station in a DHCP mode.
According to the steps of the present invention, the specific operation of this embodiment is as follows:
(1) firstly, adding related macros into a header file of control configuration for control, specifically, after a config.h file is generated through-/configuration, adding the related macros into the config.h file, wherein the macros added when a tcp method is modified in the config.h file are consistent with those in a system, and a method for checking a congestion algorithm supported by the system can be adopted:
the command is: sysctl net. ipv4.tcp _ available _ control;
(2) compiling and installing the source code after the modification is finished;
(3) configuring iptables and route:
route add default gw 192.168.1.1dev netname (network card of near server)
iptables–P INPUT ACCEPT
iptables–P FORWARD ACCEPT
iptables-t nat-A PREROUTING-I netname (network card near server) -j MASQUERADE
iptables–t nat–I POSTROUTING–s 10.0.0.0/24！–d 10.0.0.0/24–jMASQUERADE
(4) The service is started.
Typical experimental results:
the performance evaluation is carried out through an iperf network performance analysis tool in the experiment, and the transmission performance of the wireless network end-to-end link under the traditional transmission architecture and the MEC-TCP method architecture is tested in a comparative way. In the experiment, a wireless network is millimeter waves of 60GHz, a wired network is a ten-gigabit optical fiber, the transmission delay of the wired network is set to 80ms, the packet loss rate is set to 0.01%, the transmission delay of a wireless local area network is set to 1ms, the packet loss rate is set to 1%, and the experimental topology is as shown in FIG. 5. In an experiment, a server sends TCP flow to a client, in a traditional framework, congestion control algorithms such as TCP-Cubic, TCP-Reno, TCP-BBR, TCP-Wattwood and the like are carried in a test, and the difference of transmission effects is small, so that the TCP-Cubic congestion control algorithm is adopted in an end-to-end full link in the following experiment comparison graph; in the MEC-TCP architecture, segmented transmission control is adopted, the four congestion control algorithms are tested on the wired side and the wireless side respectively, the best performance is selected, the TCP-BBR congestion control algorithm is adopted on the wired side, the TCP-Cubic congestion control algorithm is adopted on the wireless side, and a cache retransmission mechanism is implemented in the MEC server.
The experimental result shows that the throughput rate of the end-to-end link is obviously improved compared with the traditional architecture, and the MEC-TCP method architecture improves the link throughput rate by more than 200% compared with the traditional architecture. Moreover, under the traditional architecture, the transmission throughput rate is extremely low, which reflects that the traditional TCP transmission architecture is not suitable for the wired and wireless hybrid link transmission environment, while the MEC-TCP can be well suitable for the wired and wireless hybrid link environment, and the end-to-end transmission rate is obviously improved.
It should be noted that:
the algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. In addition, the present invention is not directed to any particular programming language. It is to be appreciated that the subject matter described herein can be implemented in various programming languages, based on various operating systems, and that the specific language, or calls to system function blocks, described above are merely for purposes of disclosing the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (7)
1. A wireless network transmission optimization method based on MEC in a network end-to-end transmission system is characterized in that:
the server side sends a data packet with the destination of the client side to a base station side MEC server; the server side adopts a congestion control mechanism suitable for a wired link;
the MEC server sends an Early-ACK confirmation to the server after receiving the message sent by the server, and the received message is cached in the MEC server; the MEC server sends a message to the client; wherein, the MEC server adopts a congestion control mechanism suitable for a wireless link for forwarding;
deleting the cached message when receiving the corresponding ACK returned by the client; when the wireless link is interfered or interrupted accidentally, the client receives the unordered messages and triggers the repeated ACK, and the MEC server performs sequential retransmission on the messages with the returned ACK serial numbers in the cache after detecting the repeated ACK.
2. The method of claim 1, wherein MEC-TCP uses a transparent transmission mode.
3. The method of claim 1, wherein MEC-TCP is forwarded by interrupting a packet connection.
4. The method according to claim 1, wherein the MEC-based cache retransmission mechanism is a cache retransmission of the data packet by using a cache function of a MEC server on the base station side.
5. The method of claim 1 wherein the transmission performance is quantified by network throughput and transmission delay.
6. An MEC-based wireless network transmission optimization system in a network end-to-end transmission system, the system comprising: the system comprises a server, a base station side MEC server and a client; the server end adopts a wired link to the MEC server at the base station side, and the MEC server at the base station side adopts a wireless link to the client end;
the server sends a data packet with the destination of the client through the MEC server at the base station side; the server side adopts a congestion control mechanism suitable for a wired link;
the MEC server sends an Early-ACK confirmation to the server after receiving the message sent by the server, and the received message is cached in the MEC server; the MEC server sends a message to the client; wherein, the MEC server adopts a congestion control mechanism suitable for a wireless link for forwarding;
Deleting the cached message when receiving the corresponding ACK returned by the client; when the wireless link is interfered or interrupted accidentally, the client receives the unordered messages and triggers the repeated ACK, and the MEC server performs sequential retransmission on the messages with the returned ACK serial numbers in the cache after detecting the repeated ACK.
7. The system of claim 6, wherein the MEC server comprises a transport architecture module, an MEC-based cache retransmission module, and a congestion control module;
the transmission architecture module controls the TCP connection from end to end in a segmented manner so as to realize that the online side and the wireless side use different transmission control algorithms and select to use different transmission control algorithms according to different network link conditions;
the cache retransmission module based on the MEC comprises a message cache and fast retransmission mechanism and a fast response and fast confirmation mechanism;
and the congestion control module realizes the selection and deployment of the TCP congestion control algorithm which is most suitable for the links at the two ends by utilizing the TCP congestion control algorithm.
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Application publication date: 20201030 |