CN107147619B

CN107147619B - Data transmission method based on multi-source and multi-path cooperative transmission control protocol

Info

Publication number: CN107147619B
Application number: CN201710234706.8A
Authority: CN
Inventors: 权伟; 崔恩放; 张宏科; 苏伟; 刘刚; 刘亚娜; 赵允
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 2017-04-12
Filing date: 2017-04-12
Publication date: 2019-12-13
Anticipated expiration: 2037-04-12
Also published as: CN107147619A

Abstract

The invention provides a data transmission method based on a multi-source and multi-path cooperative transmission control protocol. The method mainly comprises the following steps: establishing MS-MPTCP connection between the sub-source equipment and the terminal, and establishing MS-MPTCP connection between the sub-source equipment and the source; the source communicates data with the sub-source device via multiple paths using an MS-MPTCP connection, and the sub-source device communicates data with the terminal using an MS-MPTCP connection. The invention can increase the bandwidth as much as possible through multipath under the condition that the available IP interfaces of the terminal are few, thereby improving the utilization rate of the network bandwidth, reducing the transmission delay of the data and providing the data transmission efficiency between the source and the terminal. The source can push buffer cache data to the sub-source equipment, and the terminal can also obtain the data from the sub-source equipment, so that the problems of source memory consumption and increased waiting time caused by overlarge buffer cache data and packet disorder during multi-path transmission of a large amount of data are solved. The sub-source may acquire and control the congestion window of the access terminal to more accurately implement congestion control.

Description

data transmission method based on multi-source and multi-path cooperative transmission control protocol

Technical Field

The invention relates to the technical field of wireless network communication, in particular to a data transmission method based on a multi-source and multi-path cooperative transmission control protocol.

Background

the Internet mainly relies on two protocols, namely, an Internet Protocol (IP) Protocol and a Transmission Control Protocol (TCP) Protocol. The IP protocol provides unreliable message exchange service between end to end, the TCP protocol is a transport layer protocol, provides reliable message exchange based on the IP, realizes reliable exchange of Internet data, and lays the foundation of the communication protocol of the huge Internet used by people at present. TCP has also been improving since its introduction to the present day.

in recent years, with the intellectualization and the modernization of user equipment, the equipment usually has a plurality of network interfaces, namely a plurality of network paths, however, the trend of multi-IP addresses and multi-hosts of the intelligent equipment at present is not anticipated by the TCP protocol, the plurality of paths cannot be flexibly utilized and managed, the TCP connection is directly identified by a pair of transport layer addresses (IP addresses and port numbers), transparent support cannot be provided for the multi-host, the TCP cannot utilize the plurality of IP addresses for multi-path transmission, the single IP address and the single path can influence data transmission when being congested, and the improvement of the network utilization rate is influenced.

In response to the above problems, numerous scholars have proposed solutions.

The first approach is to solve the problem at the network layer. Such as Mobile IP, HIP (Host Identity Protocol), Shim6(Site Multihoming by IPv6 interworking), which have significant disadvantages that changes of addresses and paths are hidden from the upper layer TCP, TCP congestion control cannot be accurately implemented, and efficiency is low.

another approach is to solve the problem at the transport layer. Such as SCTP (Stream Control Transmission Protocol), which is a transport layer Protocol for connection-oriented streams that provides a reliable datagram transport Protocol over protocols based on unreliable transport services. SCTP can provide a stable, orderly data delivery service between two endpoints, supporting multiple IP address connections, rather than a single connection for TCP. The SCTP protocol is an improvement of the TCP protocol, which inherits the more sophisticated congestion control of TCP and improves some of the disadvantages of TCP, but there are still large differences between them. The SCTP protocol has 2 major drawbacks:

(1) Developers need to modify an application layer interface, and the compatibility of the current numerous network applications is poor, and the popularization and the application are difficult;

(2) Because the format of the SCTP packet is greatly different from that of the TCP protocol, network intermediate devices such as a firewall and an NAT of a conventional network cannot process or even discard the SCTP packet, so that the SCTP packet cannot pass through, for example, the NAT or the firewall may block the SCTP packet.

MPTCP (Multipath TCP) is a transport layer protocol defined by IETF in 2013, and provides Multipath communication based on the conventional TCP protocol. The goal is to allow TCP connections to use multiple IP addresses for multipath transmission, thereby increasing network utilization and reducing latency. The MPTCP protocol is a transport layer protocol using multiple paths for concurrent transmission, and can improve end-to-end throughput and increase network utilization. And because MPTCP only extends the option field of TCP message, it can be widely used by traditional network equipment without changing network intermediate equipment.

the MPTCP protocol can fulfill the user's requirement for multi-IP interface utilization and can adapt to the current complex network environment, but the following problems still exist:

(1) In practical situations, the number of available IP interfaces of a user terminal device (e.g. a smart phone) is mostly 2, thereby limiting further increase of network utilization and further decrease of latency.

(2) Because the single buffer mechanism of the TCP protocol is inherited, namely only one buffer is arranged at the transmitting end or the receiving end, when MPTCP is transmitted in a multi-path way, the problems of overlarge buffer and disorder are easily caused by too many paths, CPU computing resources are consumed, and the waiting time is increased.

Disclosure of Invention

the embodiment of the invention provides a data transmission method based on a multi-source and multi-path cooperative transmission control protocol, which aims to improve the data transmission efficiency between a source and a terminal.

In order to achieve the purpose, the invention adopts the following technical scheme.

A data transmission method based on multi-source and multi-path cooperative transmission control protocol comprises the following steps:

Establishing MS-MPTCP connection between the sub-source equipment and a terminal, and establishing MS-MPTCP connection between the sub-source equipment and a source;

The source communicates data with the sub-source device via multiple paths using an MS-MPTCP connection, and the sub-source device communicates data with the terminal using an MS-MPTCP connection.

Further, before establishing the MS-MPTCP connection between the sub-source device and the terminal, the method includes:

The subtype field of the MPTCP protocol message is extended by using five identifiers from 0x8 to 0xc, and the type value of the extended subtype field, and the corresponding signaling symbol and signaling name are shown in the following table 1:

TABLE 1

Type value	signalling symbols	signaling name
			0x8	MS_SHARE	sub-source request join connection signaling
0x9	MS_JOIN	Sub-source join connection signaling
			0xa	MS_DSS	sub-source data sequence signalling
0xb	ADD_SOURCE	add sub-source signaling
			0xc	REMOVE_SOURCE	deleting sub-source signaling

further, the establishing of the MS-MPTCP connection between the sub-source device and the terminal includes:

the terminal initiates MPTCP handshake to a source through a wireless communication network or a wired communication network, establishes MPTCP connection between the terminal and the source through three-way handshake process, and exchanges version number between the terminal and the source;

setting one or more sub-source devices at an access terminal side, wherein the sub-source devices have a plurality of IP addresses and are connected with the source through a plurality of network paths, the sub-source devices send sub-source requests to join a connection signaling MS _ SHARE signaling to the terminal, the terminal responds to the MS _ SHARE signaling, the sub-source devices and the terminal determine that both versions support an MS-MPTCP protocol through a handshake process, the MS-MPTCP connection between the sub-source devices and the terminal is established, and the sub-source devices obtain a key of the terminal in the connection with the source MPTCP;

And the terminal sends an ADD sub-SOURCE signaling ADD _ SOURCE signaling to the SOURCE, the ADD _ SOURCE signaling carries the address of the sub-SOURCE equipment, and the SOURCE responds to the ADD _ SOURCE signaling and ADDs the address of the sub-SOURCE equipment in the MPTCP connection.

further, the establishing of the MS-MPTCP connection between the sub-source device and the source includes:

The sub-source equipment sends a sub-source joining connection signaling MS _ JOIN signaling carrying the key to the source, requests to add the sub-source equipment in MPTCP connection, the source responds to the MS _ JOIN signaling, the sub-source equipment and the source determine that both versions support an MS-MPTCP protocol through a handshake process, and MS-MPTCP connection between the sub-source equipment and the source is established.

Further, the source performs data communication with the sub-source device through a plurality of paths using an MS-MPTCP connection, and the sub-source device performs data communication with the terminal using the MS-MPTCP connection, including:

the source sends a sub-source data sequence signaling MS _ DSS signaling to the sub-source equipment through MS-MPTCP connection, the MS _ DSS signaling carries a data set distributed to the sub-source equipment, the sub-source equipment forwards the MS _ DSS signaling to the terminal through MS-MPTCP connection, the source sends data corresponding to the data set to the sub-source equipment through MS-MPTCP connection by utilizing a plurality of network paths, and the sub-source equipment stores the received data corresponding to the data set;

The terminal finds that the requested data belong to a data set of one or more sub-source devices, sends a data request signaling to the one or more sub-source devices through MS-MPTCP connection, and the one or more sub-source devices send the requested data to the terminal through MS-MPTCP connection according to the stored data corresponding to the data set;

the terminal sends the uploading data which needs to be uploaded to the source to one or more sub-source devices through MS-MPTCP connection, and the one or more sub-source devices send the uploading data to the source through MS-MPTCP connection by utilizing a plurality of network paths.

further, the method further comprises the following steps:

The SOURCE sends a REMOVE sub-SOURCE signaling REMOVE _ SOURCE signaling to the sub-SOURCE equipment through MS-MPTCP connection, the sub-SOURCE equipment responds to the REMOVE _ SOURCE signaling and closes the MS-MPTCP connection between the sub-SOURCE equipment and the SOURCE, the sub-SOURCE equipment forwards the REMOVE _ SOURCE signaling to a terminal through the MS-MPTCP connection, and the terminal responds to the REMOVE _ SOURCE signaling and closes the MS-MPTCP connection between the terminal and the sub-SOURCE equipment;

Or,

the terminal sends a REMOVE sub-SOURCE signaling REMOVE _ SOURCE signaling to the sub-SOURCE equipment through MS-MPTCP connection, the sub-SOURCE equipment responds to the REMOVE _ SOURCE signaling and closes MS-MPTCP connection between the sub-SOURCE equipment and the terminal, the sub-SOURCE equipment forwards the REMOVE _ SOURCE signaling to a SOURCE through MS-MPTCP connection, and the SOURCE responds to the REMOVE _ SOURCE signaling and closes MS-MPTCP connection between the SOURCE and the sub-SOURCE equipment.

Further, the method further comprises the following steps:

The source sends a fast close signaling MP _ FASTCLOSE signaling to the sub-source equipment through MS-MPTCP connection, the sub-source equipment is informed not to send data to the sub-source equipment any more, the sub-source equipment forwards the MP _ FASTCLOSE signaling to the terminal through MS-MPTCP connection, and after the stored data transmission is finished, the sub-source equipment closes the MS-MPTCP connection with the source and closes the MS-MPTCP connection with the terminal;

Or;

The terminal sends a fast close signaling MP _ FASTCLOSE signaling to the sub-source equipment through MS-MPTCP connection to inform the sub-source equipment that the sub-source equipment does not send data to the sub-source equipment any more, the sub-source equipment forwards the MP _ FASTCLOSE signaling to a source through MS-MPTCP connection, and the sub-source equipment closes the MS-MPTCP connection with the terminal and closes the MS-MPTCP connection with the source after the stored data transmission is finished.

According to the technical scheme provided by the embodiment of the invention, the source utilizes the MS-MPTCP connection to carry out data communication with the sub-source equipment through a plurality of paths, the sub-source equipment utilizes the MS-MPTCP connection to carry out data communication with the terminal, and the bandwidth can be increased as much as possible through the multipath under the condition that the available IP interfaces of the terminal are few, so that the utilization rate of the network bandwidth is improved, the transmission delay of data is reduced, and the data transmission efficiency between the source and the terminal is improved. The source can push buffer cache data to the sub-source equipment, and the terminal can also obtain the data from the sub-source equipment, so that the problems of source memory consumption and increased waiting time caused by overlarge buffer cache data and packet disorder during multi-path transmission of a large amount of data are solved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 labor.

Fig. 1 is a schematic diagram of main blocks of an MS-MPTCP extension according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a main working process of an MS-MPTCP protocol according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a general message format of an MS-MPTCP protocol according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a message format of an MS _ SHARE (sub-source request join connection signaling) according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of an establishment process of an MS-MPTCP connection according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a message format of an MS _ JOIN (sub source joining connection signaling) provided in the embodiment of the present invention:

FIG. 7 is a flowchart of a specific joining handshake of a new sub-source according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of an MS _ DSS option message format according to an embodiment of the present invention;

Fig. 9 is a schematic diagram of a process of closing an MS-MPTCP connection according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an ADD _ SOURCE message format according to an embodiment of the present invention;

FIG. 11 is a flowchart illustrating adding a sub-SOURCE address via ADD _ SOURCE according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a message format for removing a sub-SOURCE address REMOVE _ SOURCE according to an embodiment of the present invention;

FIG. 13 is a flowchart illustrating the method for deleting the sub-SOURCE address by REMOVE _ SOURCE according to an embodiment of the present invention;

FIG. 14 is a flow chart of a process for shutting down a sub-source according to an embodiment of the present invention;

fig. 15 is a processing flow chart of a data transmission method based on a multi-source and multi-path cooperative transmission control protocol according to an embodiment of the present invention;

Fig. 16a is a schematic diagram of a terminal communicating with a sub-source device and a sub-source device through a relay of a base station according to a second embodiment of the present invention;

Fig. 16b is a schematic diagram of a terminal communicating with a sub-source device and a sub-source device through a relay of a router according to a second embodiment of the present invention;

Fig. 16c is a schematic diagram of a terminal simultaneously communicating with a sub-source device and a sub-source device through a relay of a base station and a router according to a second embodiment of the present invention;

fig. 17 is a specific processing flowchart of a terminal communicating with a source through a sub-source device at an access terminal side according to a third embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

for the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.

The embodiment of the invention aims at the problems that the network utilization rate cannot be further improved and the time delay cannot be further reduced due to the limitation of the number of IP interfaces in the practical situation of the MPTCP, and the MPTCP inherits a single buffer mechanism of a TCP protocol, and when in multi-path transmission, the buffer is too large, CPU (central processing unit) computing resources are consumed, and the waiting time is increased due to too many paths, and the MPTCP is expanded, and the sub-source equipment is increased to increase the bandwidth and reduce the time delay by flexibly managing the network paths.

The embodiment of the invention provides a multi-source cooperation MPTCP transmission strategy, which is an extension of MPTCP, supports the division and transmission of a data buffer area (buffer) of a transmission source to a plurality of different sources, a receiver can obtain data from the different sources, achieves the aim of multi-source and multi-path cooperation transmission, realizes the separation of resources and positions, and can firstly cache and sort the data and then send the data to a terminal by multiple sources, thereby reducing the load of a CPU (central processing unit) of the terminal. The multi-source and multi-path cooperative transmission strategy can further increase the network utilization rate under the condition that the number of the IP interfaces of the equipment is limited, and reduce collision congestion by flexibly managing network paths.

The MS-MPTCP (multi-source and multi-path cooperative transmission control protocol) protocol provided in the embodiment of the present invention extends MPTCP, and a schematic diagram of main modules of the MS-MPTCP extension is shown in fig. 1, and includes six parts, i.e., a message format, connection establishment, a sub-source addition, a normal operation, address exchange, and rapid closing.

The function of the MS-MPTCP protocol is to perform path allocation and congestion management from the transport layer, and a schematic diagram of the main working process of the MS-MPTCP protocol is shown in fig. 2, and includes: the terminal establishes a TCP-like connection with the sub-source first, and then establishes a TCP-like connection with the multi-path homologous source, so that the sub-source can control a congestion window of the access terminal and know the congestion condition of each path to carry out path scheduling. Therefore, the terminal can utilize multiple paths by using a single network interface.

The general message format schematic diagram of the MS-MPTCP protocol is shown in fig. 3, and the subtype is expanded by using five identifiers from 0x8 to 0xc on the basis of the original MPTCP, and the specific meanings are as follows:

(1) Establishing MS-MPTCP connections

MS-MPTCP adds MS _ SHARE (sub source request joining connection signaling) on the basis of MPTCP, and the schematic diagram of the message format is shown in FIG. 4, wherein the option type, the option length, the sub type, the version and the A-H meaning are the same as the MP _ CAPABLE signaling in MPTCP; the key of the sub-source is the key generated by the sub-source; the key used by the end in the MPTCP connection is the key provided by the end in the MPTCP handshake with the other end for the first time.

The MS-MPTCP connection establishment process is schematically illustrated in fig. 5, where the MS-MPTCP connection is established on the basis of MPTCP, the MPTCP connection may be established between two end hosts, an address is added, then a sub source sends a sub source request join connection signaling (MS _ SHARE) to one end host, and requests to establish the MS-MPTCP connection between the sub source and the end host, and the end host provides a related key. When the end host does not support the MS-MPTCP function, no response is made, and the sub source joining fails and returns to the MPTCP connection.

in addition, when both the hosts do not support MS-MPTCP, no matter the sub-source requests to join the connection to any host, the sub-source cannot be responded; when one party supports and the other party does not support, the support party can know that the version of the other party does not support according to the version number of the first handshake, and when the sub source requests the support party to join the connection, the support party does not respond. That is, either end of the two ends does not support the time source, and whether the support is judged by the version number is judged.

(2) adding a new sub-source

The MS-MPTCP adds MS _ JOIN (sub-source JOIN connection signaling) on the basis of MPTCP, the message format of which is shown in fig. 6, the specific JOIN handshake flow of the new sub-source is shown in fig. 7, and the processing procedure includes: on the basis of establishing MPTCP connection, the mode of adding the sub-source is similar to the mode of adding a new address of MPTCP into MS-MPTCP connection, the sub-source can be added into the MPTCP connection through MS _ JOIN signaling after obtaining a related key, the specific handshake flow inherits the MPTCP, and the difference is that the terminal records the handshake as the sub-source adding connection.

(4) Regular MS-MPTCP operation

a. Data sequence mapping

The MS _ DSS option message format is schematically illustrated in fig. 8:

MS-MPTCP adds MS _ DSS signaling to MPTCP, which has two roles: first, when data is transmitted to a sub-source, informing the sub-source of the data set transmitted by the sub-source; and secondly, the data set is used for informing the terminal of the data set owned by the sub source.

b. Data validation

The data confirmation inherits the MPTCP mode, and the message is not changed.

c. Closing the connection

fig. 9 shows a schematic diagram of a process of closing an MS-MPTCP connection, when the sub-source is closed, a host at either end may send an MP _ FASTCLOSE (fast close signaling in MPTCP protocol) signaling to notify the sub-source C that data is no longer sent to the sub-source C, the MS-MPTCP connection will be closed, the sub-source C notifies the host at the other end to close the connection, stop continuing to transmit data to the sub-source C, and close the MS-MPTCP connection after the sub-source has data transmission completed.

d. Reliability and retransmission

The first mode is that when the data requested from the source or the sub-source needs to be retransmitted, the retransmission is continuously requested from the source or the sub-source; the second is to get from the source when the sub-source is disconnected and can not retransmit.

f. Congestion control

the congestion control method can be flexibly set.

e. Sub-source strategy

The sub-source strategy comprises the starting position and the ending position of the data transmitted by the source to the sub-source, whether the sub-source is used or not, a sub-source coordination strategy and the like, and can be flexibly set. The implementation of the strategy can be completed by other extended signaling without designing new signaling.

(5) Sub-source address information exchange

a. Informing of sub-source addresses

An ADD _ SOURCE message format schematic diagram is shown in fig. 10, and a flow of adding a sub-SOURCE address through ADD _ SOURCE is shown in fig. 11, and the flow mainly includes: sending ADD _ SOURCE signaling from one end host to the other end host, wherein the signaling comprises a sub-SOURCE address, and the other end host responds to the signaling to acquire the sub-SOURCE address; add failure if no response or packet loss.

b. removing sub-source addresses

the message format for removing the sub-SOURCE address REMOVE _ SOURCE is shown in fig. 12, and the flow for deleting the sub-SOURCE address through REMOVE _ SOURCE is shown in fig. 13, which mainly includes: when the sub-SOURCE is requested to be deleted, the host at either end can send REMOVE _ SOURCE signaling to inform the sub-SOURCE C that the sub-SOURCE is requested to be deleted, the sub-SOURCE C responds and informs the host at the other end that the sub-SOURCE is requested to be deleted, and the host at the other end responds.

(6) sub source shut down

FIG. 14 shows a flow chart of a process for turning off a sub-source, which mainly includes: either end of the host may send an MP _ fastclone (fast shutdown signaling in MPTCP protocol) signaling that the sub-source C is no longer sending data to the sub-source C and will close the connection, and the sub-source C notifies the other end of the host to close the connection, stop continuing to transmit data to the sub-source C, and close the connection after the sub-source has completed transmitting data.

Example one

a processing flow of the data transmission method based on the multi-source and multi-path cooperative transmission control protocol provided in this embodiment is shown in fig. 15, and includes the following processing steps:

step S10, an MPTCP connection is established between the terminal and the source.

The terminal initiates MPTCP handshake to the source through a wireless communication network or a wired communication network, establishes MPTCP connection between the terminal and the source through three-way handshake process, and exchanges version number between the terminal and the source. A source refers to one end that can provide data, and a server is one type of source.

And step S20, establishing the MS-MPTCP connection between the sub-source equipment and the terminal.

One or more sub-source devices are arranged at the side of the access terminal, the sub-source devices have a plurality of IP addresses and are connected with the source through a plurality of network paths, and the sub-source devices are communicated with the terminal through a relay of a base station or a router. The sub-source equipment sends a sub-source request joining connection signaling MS _ SHARE signaling to the terminal through a relay of a base station or a router, the terminal responds to the MS _ SHARE signaling, the sub-source equipment and the terminal determine that both versions support an MS-MPTCP protocol through a handshake process, MS-MPTCP connection between the sub-source equipment and the terminal is established, and the sub-source equipment obtains a key of the terminal in the connection with the source MPTCP;

Step S30, establishing a MS-MPTCP connection between the sub-source device and the source.

And step S40, the source utilizes the MS-MPTCP connection to carry out data communication with the sub-source equipment through a plurality of paths, and the sub-source equipment utilizes the MS-MPTCP connection to carry out data communication with the terminal.

And step S50, the terminal or the source sends a fast closing signaling MP _ FASTCLOSE signaling to the sub-source equipment through the MS-MPTCP connection, and the MS-MPTCP connection between the terminal or the source and the sub-source equipment is closed.

Or;

Or,

example two

Operator-side future 5G network architecture

Due to the burstiness of network use, the utilization rate of network equipment at the operator side is not high, but the user bandwidth cannot be effectively improved, because the improvement of the network utilization rate is limited by a single path due to the single IP address binding of the TCP protocol. The wireless communication speed of the future 5G terminal can reach more than 20Gbps, which puts great demands on the network at the side of an operator, and the bottleneck of further expanding the network utilization rate of the MPTCP is that the number of IP of terminal equipment is limited, the network card receiving capacity is limited, the CPU memory is limited, and the like, and a mobile phone can only have one sim (subscriber identity Module) card when being accessed to the internet through a single operator, namely has one IP.

Fig. 16a is a schematic diagram of a terminal communicating with a sub-source device and a source through a relay of a base station according to a second embodiment of the present invention, fig. 16b is a schematic diagram of a terminal communicating with a sub-source device and a source through a relay of a router, and fig. 16c is a schematic diagram of a terminal communicating with a sub-source device and a source through a relay of a base station and a router at the same time. In fig. 16a and 16c, the base station on the access terminal side communicates with the terminal and the source through the wireless communication network, and in fig. 16b and 16c, the router on the access terminal side communicates with the terminal and the source through the wired communication network.

the specific implementation steps of the terminal communicating with the sub-source equipment and the source through the relay of the base station comprise:

1. a plurality of MS-MPTCP sub-source devices are added on an access terminal side and serve as sub-sources when the terminal is communicated with a source, the sub-sources can be shared by the terminal, and the sub-source devices have a plurality of IP addresses and high bandwidth. The terminal and the source support MS-MPTCP simultaneously.

2. When the terminal is connected with the internet through the base station to perform data transmission, the sub-source equipment accesses the source through the multi-path, the total bandwidth of the plurality of sub-sources is larger than the receiving rate of the terminal, the terminal can acquire data at the sub-source, and when the path of the sub-source equipment accessing the source of the base station is congested to cause bandwidth oscillation, the terminal can still receive the data at the unchanged receiving rate because the data is pushed to the edge of the network in advance, so that the network congestion cannot be felt, and the requirement of a 5G bandwidth of a user is met.

Taking fig. 16a as an example, the specific processing procedure includes:

When a terminal B accesses a source A through an operator, the terminal initiates an MPTCP handshake to the source, establishes an MPTCP connection between the terminal and the source through three handshakes, and exchanges version numbers; and then the sub-source equipment C handshakes the terminal, determines that both versions support MS-MPTCP expansion, establishes MS-MPTCP connection between the terminal and the sub-source equipment C, obtains a key of the terminal in the connection with the source MPTCP, initiates connection to the source by using the key, requests to add a sub-source, and establishes MS-MPTCP connection between the sub-source equipment C and the source. Then, the source A sends MS _ DSS signaling to the sub-source equipment C to inform the data set allocated to the sub-source equipment C, the sub-source equipment C forwards the MS _ DSS to the terminal B, then data transmission is started, the source transmits the data set allocated to the sub-source equipment C while maintaining the data transmission with the terminal B, and when the terminal requests data, the terminal finds that the data belongs to the sub-source C, the terminal sends data request signaling to the sub-source equipment C.

Since the sub-source equipment C is close to the terminal B, the data access delay is low, the data can be pushed to a place close to a user in advance through multipath high bandwidth in the scene, and the user can acquire the data nearby. The general terminal has limited bandwidth and limited IP number, the CPU memory consumption is high when the IP is excessive, the MS-MPTCP transfers part of the CPU consumption to the sub-source equipment, more IPs can be utilized, and the bandwidth utilization can be optimized by reducing the network delay aiming at the limited bandwidth.

3. The existing IP layer has multi-path balanced load, such as an equal cost multi-routing (ECMP) algorithm, but the algorithm cannot well utilize a plurality of paths, because the multi-path utilization is not necessarily only directed at the equal cost path, the current algorithm cannot well solve the problem, and the sub-source can flexibly utilize the specific situation of the multi-path.

EXAMPLE III

Large file upload

In some scenarios, there is a high demand for large file uploading, and it is desirable to transmit and free the terminal as quickly as possible, and in such a scenario, this problem can be solved by using multi-source cooperative MPTCP. The terminal may transmit data to the nearest sub-source device, which is large and stable in short-range transmission bandwidth and free of congestion interference, and then the sub-source may acknowledge the data one by one with the source. The terminal does not need to wait for data to be transmitted through a long-route network, only needs to transmit the data to the nearest sub-source equipment, and the sub-source equipment completes the time-consuming task, so that the terminal is liberated as soon as possible.

The method comprises the following specific implementation steps:

1. the sub-source device may be a switch or a router, or may be a general source of the x86 architecture, which supports MS-MPTCP.

2. and upgrading the terminal equipment to support MS-MPTCP.

3. the terminal is directly connected with the sub source in a wifi or wired mode, and the sub source is connected with the source through a plurality of paths.

4. When data are uploaded, the terminal can transmit the data to the sub source with the stable maximum bandwidth due to direct connection, the data can be transmitted quickly, and the terminal can be liberated.

5. the sub-source will buffer the data and transmit it to the source via the multi-stage network through multiple paths and acknowledge the data packets one by one.

6. the mechanism hands data validation to the network for completion without the user having to wait for this process.

in summary, the embodiments of the present invention establish MS-MPTCP connection between the sub-source device and the terminal, and the source, the source performs data communication with the sub-source device through multiple paths by using the MS-MPTCP connection, and the sub-source device performs data communication with the terminal by using the MS-MPTCP connection, and the following advantages are provided:

(1) under the condition that the number of available IP interfaces of the terminal is small, the bandwidth can be increased as much as possible through multipath, so that the utilization rate of the network bandwidth is improved, and the transmission delay of data is reduced.

(2) The source can push buffer cache data to the sub-source equipment, and the terminal can also obtain the data from the sub-source equipment, so that the problems of source memory consumption and increased waiting time caused by overlarge buffer cache data and packet disorder during multi-path transmission of a large amount of data are solved.

(3) the sub-source may obtain congestion windows for all access terminals and may control the congestion window for each terminal based on the current network conditions to reduce collision congestion.

Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A data transmission method based on multi-source and multi-path cooperative transmission control protocol is characterized by comprising the following steps:

TABLE 1

establishing MS-MPTCP connection between the sub-source equipment and a terminal, and establishing MS-MPTCP connection between the sub-source equipment and a source; comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the terminal sends an ADD sub-SOURCE signaling ADD _ SOURCE signaling to the SOURCE, the ADD _ SOURCE signaling carries the address of the sub-SOURCE equipment, and the SOURCE responds to the ADD _ SOURCE signaling and ADDs the address of the sub-SOURCE equipment in MPTCP connection;

2. The method of claim 1, wherein establishing the MS-MPTCP connection between the sub-source device and the source comprises:

3. the method of claim 2, wherein the source communicates data with the sub-source device over multiple paths using an MS-MPTCP connection, and the sub-source device communicates data with the terminal using an MS-MPTCP connection, comprising:

4. a method according to claim 1, 2 or 3, characterized in that the method further comprises:

Or,

5. a method according to claim 1, 2 or 3, characterized in that the method further comprises:

Or;