CN103581035A

CN103581035A - Method, device and system for multi-path TCP congestion control

Info

Publication number: CN103581035A
Application number: CN201210271599.3A
Authority: CN
Inventors: 何宁; 朱雷
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-08-01
Filing date: 2012-08-01
Publication date: 2014-02-12
Anticipated expiration: 2032-08-01
Also published as: CN103581035B; WO2014019528A1

Abstract

The embodiment of the invention provides a method, device and system for multi-path TCP congestion control, and relates to the field of communication. The method, device and system are used for carrying out congestion control before congestion occurs and improve efficiency of data transmission. The method comprises the steps that a data packet sent by a network node of a first access network in at least one multi-path TCP substream constructed in the first access network by a sending end is received by a receiving end; if it is detected that the data packet supports explicit congestion, a transmission ECT zone bit of an ECN is identified by a first identifier; a CE zone bit is identified by a second identifier, and congestion control is carried out on the receiving end; an ECN feedback ECE zoon bit of the data packet is identified by a third identifier; a CWR zoon bit is identified by a fourth identifier. The method, device and system are suitable for congestion control of networks.

Description

A kind of method, Apparatus and system of multipath TCP congestion control

Technical field

The present invention relates to the communications field, relate in particular to a kind of method, Apparatus and system of multipath TCP congestion control.

Background technology

MPTCP (Multipath Transport Control Protocol, Multipath Transmission control protocol) be based upon TCP (Transport Control Protocol, transmission control protocol), on basis, it mainly contains two functions: packet scheduling and path management.MPTCP is transparent to application layer.MPTCP is by the Data dissemination of transmit leg application layer to each subflow transmission, and the data of each subflow transmission that recipient is received are submitted to application layer according to the order of sequence.MPTCP is by providing multipath to realize the utilance that improves resource, thus the capacity of lifting network.

MPTCP relies on subflow to send and receives data, in subflow, occurs when congested, and MPTCP needs antithetical phrase stream to carry out congestion control.In the prior art, MPTCP, by adjusting congestion window size, realizes antithetical phrase stream and carries out congestion control.Concrete, MPTCP passes through formula

\min

(\frac{alpha * bytes_acked * MSS_i}{cwnd_total}, \frac{bytes_acked * MSS_i}{cwnd_i})

Adjust congestion window size.Wherein, cwnd_i represents the congestion window of i subflow; Cwnd_total represents the congestion window sum of all subflows, and MSS_i represents the maximum segment value of i subflow; Bytes_acked is illustrated in the size of the byte that in a round-trip delay, receiving end has been confirmed; Alpha is coefficient, passes through formula

alpha = cwnd_total * \frac{MAX (cwnd_i / rtt_i^{2})}{{(SUM (cwnd_i / rtt_i))}^{2}}

Calculate; Rtt_i represents round-trip delay.

State in realization in the process of congestion control, inventor finds that in prior art, at least there are the following problems: the transmitting terminal of data only just can carry out congestion control after generation is congested, at this moment network node may abandon some packets, has reduced the efficiency of transfer of data.

Summary of the invention

Embodiments of the invention provide a kind of method, Apparatus and system of multipath TCP congestion control, in order to before congested generation, carry out congestion control, improve the efficiency of transfer of data.

For achieving the above object, embodiments of the invention adopt following technical scheme:

First aspect, the embodiment of the present invention provides a kind of method of multipath TCP congestion control, comprise: at least one Multipath Transmission control protocol TCP subflow that receiving terminal receiving end/sending end has been set up at the first Access Network, the packet sending through the network node of the first Access Network;

If the transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet being detected identifies with the first identifier; Congestion alarm CE flag bit identifies with the second identifier, and described receiving terminal carries out congestion control; Wherein, the ECN of described packet feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier.

In the possible implementation of the first, the described congestion control that carries out comprises: in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described receiving terminal sends the first synchronizing sequence numbering SYN packet to described transmitting terminal; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow; Described receiving terminal receives the first synchronizing sequence numbering and the confirmation SYN-ACK packet that described transmitting terminal sends; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information; Described receiving terminal sends and confirms ack msg bag to described transmitting terminal; In described ack msg bag, carry MP_JOIN information.

In conjunction with first aspect, in the possible implementation of the second, described in carry out congestion control and comprise: described receiving terminal sends the first response data packet to described transmitting terminal, so that described transmitting terminal carries out congestion control; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

In conjunction with first aspect, in the third possible implementation, described in carry out congestion control and comprise: the multipath TCP subflow of having set up is carried out to congestion control, and sends the second response data packet to transmitting terminal; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

Second aspect, the embodiment of the present invention provides a kind of method of multipath TCP congestion control, comprising: at least one Multipath Transmission control protocol TCP subflow that transmitting terminal has been set up at the first Access Network, to receiving terminal, send packet; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; So that the network node of the first Access Network is about to when congested network being detected, by changing the sign of CE flag bit, notify described receiving terminal, so that described receiving terminal carries out congestion control; If receiving terminal carries out congestion control, described transmitting terminal carries out corresponding congestion control.

In the possible implementation of the first, described transmitting terminal carries out corresponding congestion control and comprises: in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described transmitting terminal receives the first synchronizing sequence numbering SYN packet that described receiving terminal sends; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow; Described transmitting terminal sends the first synchronizing sequence numbering and confirms SYN-ACK packet to described receiving terminal; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information; Described transmitting terminal receives the confirmation ack msg bag that described receiving terminal sends; In described ack msg bag, carry MP_JOIN information.

In conjunction with second aspect, in the possible implementation of the second, described transmitting terminal carries out corresponding congestion control and comprises: described transmitting terminal receives the first response data packet that described receiving terminal sends; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

In conjunction with the possible implementation of the second of second aspect or second aspect, in the third possible implementation, after described transmitting terminal receives the first response data of described receiving terminal transmission, also comprise: in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described transmitting terminal sends a described SYN packet to described receiving terminal; Described transmitting terminal receives the described SYN-ACK packet that described receiving terminal sends; Described transmitting terminal sends described ack msg bag to described receiving terminal.

In conjunction with the possible implementation of the second of second aspect or second aspect, in the 4th kind of possible implementation, after described transmitting terminal receives the first response data of described receiving terminal transmission, also comprise: described transmitting terminal carries out congestion control to the multipath TCP subflow of having set up.

In conjunction with second aspect, in the 5th kind of possible implementation, described transmitting terminal carries out corresponding congestion control and comprises: described transmitting terminal receives the second response data packet that described receiving terminal sends; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

The third aspect, the embodiment of the present invention provides a kind of device of multipath TCP congestion control, comprising:

Receiving element, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for receiving end/sending end, the packet sending through the network node of the first Access Network; Processing unit, identifies with the first identifier for the transmission ECT flag bit the support ecn (explicit congestion notification) ECN of described packet being detected; In the situation of congestion alarm CE flag bit by the second identifier sign, described receiving terminal carries out congestion control; Wherein, the ECN of described packet feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier.

In the possible implementation of the first, described processing unit specifically comprises: the first sending module, the first receiver module; Described the first sending module, for in the situation that described transmitting terminal accesses described device by the second Access Network, if described transmitting terminal and described device are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described transmitting terminal, send the first synchronizing sequence numbering SYN packet; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN information represents to add a multipath TCP subflow; Described the first receiver module, the first synchronizing sequence numbering and the confirmation SYN-ACK packet that for receiving described transmitting terminal, send; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information; Described the first sending module, also for sending and confirm ack msg bag to described transmitting terminal; In described ack msg bag, carry MP_JOIN information.

In conjunction with the third aspect, in the possible implementation of the second, described processing unit specifically for, to described transmitting terminal, send the first response data packet, so that described transmitting terminal carries out congestion control; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

In conjunction with the third aspect, in the third possible implementation, described processing unit specifically for, the multipath TCP subflow of having set up is carried out to congestion control, and sends the second response data packet to transmitting terminal; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

Fourth aspect, the embodiment of the present invention provides a kind of device of multipath TCP congestion control, comprising: transmitting element, sends packet at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network to receiving terminal; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; So that the network node of the first Access Network is about to when congested network being detected, by changing the sign of CE flag bit, notify described receiving terminal, so that described receiving terminal carries out congestion control; Processing unit, carries out for receiving terminal, in the situation of congestion control, carrying out corresponding congestion control.

In the possible implementation of the first, described processing unit comprises: receiver module and sending module; Described receiver module, for in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described device and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, receive the first synchronizing sequence numbering SYN packet that described receiving terminal sends; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow; Described sending module, for sending the first synchronizing sequence numbering and confirming SYN-ACK packet to described receiving terminal; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information; Described receiver module, the confirmation ack msg bag also sending for receiving described receiving terminal; In described ack msg bag, carry MP_JOIN information.

In conjunction with fourth aspect, in the possible implementation of the second, described processing unit specifically for, receive the first response data packet that described receiving terminal sends; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

In conjunction with the possible implementation of the second of fourth aspect or fourth aspect, in the third possible implementation, described transmitting element, also in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described receiving terminal, send a described SYN packet; Described device, also comprises: receiving element, the described SYN-ACK packet sending for receiving described receiving terminal; Described transmitting element, also for sending described ack msg bag to described receiving terminal.

In conjunction with the possible implementation of the second of fourth aspect or fourth aspect, in the 4th kind of possible implementation, described processing unit, also carries out congestion control for the multipath TCP subflow to having set up.

In conjunction with fourth aspect, in the 5th kind of possible implementation, described processing unit specifically for, receive the second response data packet that described receiving terminal sends; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

The 5th aspect, the embodiment of the present invention provides a kind of device of multipath TCP congestion control, comprise: receiver, the packet sending at least one Multipath Transmission control protocol TCP subflow of having set up through the network node of the first Access Network for receiving terminal receiving end/sending end; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the second identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; Processor, in the situation that the described CE flag bit of described packet to be detected be the second identifier, carries out congestion control.

The 6th aspect, the embodiment of the present invention provides a kind of device of multipath TCP congestion control, comprising: transmitter, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for transmitting terminal sends packet to receiving terminal; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; So that the network node of the first Access Network is about to when congested network being detected, by changing CE flag bit, notify described receiving terminal, so that described receiving terminal carries out congestion control; Processor, in the situation that receiving terminal carries out congestion control, carries out corresponding congestion control.

The 7th aspect, the embodiment of the present invention provides a kind of system of multipath TCP congestion control, comprising: transmitting terminal, network node, receiving terminal; Described transmitting terminal is the device of a kind of multipath TCP congestion control described in the above-mentioned third aspect; Described receiving terminal is the device of a kind of multipath TCP congestion control described in above-mentioned fourth aspect.

Eight aspect, the embodiment of the present invention provides a kind of system of multipath TCP congestion control, comprising: transmitting terminal, network node, receiving terminal; Described transmitting terminal is the device of a kind of multipath TCP congestion control described in above-mentioned the 5th aspect; Described receiving terminal is the device of a kind of multipath TCP congestion control described in the 6th aspect.

This aspect embodiment provides a kind of method of multipath TCP congestion control, Apparatus and system, transmitting terminal sends packet at least one multipath TCP subflow of having set up of the first Access Network, if it is soon congested that the network node of the first Access Network detects network, the ECT flag bit in packet is identified with the first identifier, CE flag bit identifies with the second identifier, ECE flag bit identifies with the 3rd identifier, CWR flag bit is sent to receiving terminal by the 4th identifier sign, receiving terminal receives after packet, the CE flag bit that packet detected identifies with the second identifier, carry out congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

The method schematic diagram of a kind of multipath TCP congestion control that Fig. 1 provides for the embodiment of the present invention;

The method schematic diagram of the another kind of multipath TCP congestion control that Fig. 2 provides for the embodiment of the present invention;

The method schematic diagram of the another kind of multipath TCP congestion control that Fig. 3 provides for the embodiment of the present invention;

The method schematic diagram of the another kind of multipath TCP congestion control that Fig. 4 provides for the embodiment of the present invention;

The method schematic diagram of the another kind of multipath TCP congestion control that Fig. 5 provides for the embodiment of the present invention;

The method schematic diagram of the another kind of multipath TCP congestion control that Fig. 6 provides for the embodiment of the present invention;

The structural representation of the device of a kind of multipath TCP congestion control that Fig. 7 provides for the embodiment of the present invention;

Fig. 8 is the structural representation of processing unit of the device of a kind of multipath TCP congestion control shown in Fig. 7;

The structural representation of the device of the another kind of multipath TCP congestion control that Fig. 9 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 10 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 11 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 12 provides for the embodiment of the present invention;

Figure 13 is the structural representation of processing unit of the device of a kind of multipath TCP congestion control shown in Figure 12;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 14 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 15 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 16 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 17 provides for the embodiment of the present invention;

The structural representation of the device of the another kind of multipath TCP congestion control that Figure 18 provides for the embodiment of the present invention;

The structural representation of the system of a kind of multipath TCP congestion control that Figure 19 provides for the embodiment of the present invention;

The structural representation of the system of the another kind of multipath TCP congestion control that Figure 20 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, as shown in Figure 1, comprising:

101, at least one Multipath Transmission control protocol TCP subflow that receiving terminal receiving end/sending end has been set up at the first Access Network, the packet sending through the network node of the first Access Network.

Concrete, transmitting terminal is by the first Access Network and the second Access Network access receiving terminal, in the first Access Network, between transmitting terminal and receiving terminal, set up at least one multipath TCP (Transport Control Protocol, transmission control protocol) subflow, transmitting terminal sends packet by described at least one multipath TCP subflow to receiving terminal, and receiving terminal receives the packet through the network node transmission of the first Access Network at least one multipath TCP subflow of the first Access Network.

For example, the first Access Network is 3Gpp network, network node is eNB (E-UTRAN Node B, the UMTS Terrestrial radio access network node of evolution) or SGW (Serving Gateway, gateway), or the router in network, transmitting terminal has been set up at least one multipath TCP subflow by 3Gpp network and receiving terminal.Transmitting terminal sends packet by least one multipath TCP subflow of 3Gpp network to receiving terminal, and packet is forwarded to receiving terminal through network node eNB, SGW, and receiving terminal receives packet.Wherein, when network is about to when congested, network node can change to CE flag bit in packet the second identifier sign; Or in the situation of Access Network link-quality variation, eNB can change to CE flag bit in packet the second identifier sign.

In addition, the first Access Network can be also non-3Gpp network, WLAN for example, network node is AGW (Access Gateway, IAD) or PDG (packet data gateway, or the router in network packet data gateway) or ePDG (evolved packet data gateway, the packet data gateway of evolution).Transmitting terminal has been set up at least one multipath TCP subflow by non-3Gpp network and receiving terminal.Transmitting terminal sends packet by least one multipath TCP subflow of non-3Gpp network to receiving terminal, and packet is through target node to receiving terminal, and receiving terminal receives packet.When network is about to congested or works as in the situation of Access Network link-quality variation, network node can change to CE flag bit in packet the second identifier sign.

If the 102 transmission ECT flag bits that the support ecn (explicit congestion notification) ECN of described packet detected identify with the first identifier; Congestion alarm CE flag bit identifies with the second identifier, and described receiving terminal carries out congestion control.

Wherein, the ECN of described packet feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier.

Further, ECT (ECN-Capable Transport supports the transmission of ecn (explicit congestion notification) ECN) flag bit is used for showing whether support ECN (Explicit Congestion Notification, ecn (explicit congestion notification)).CE (Congestion Experienced, congestion alarm) flag bit is used for showing that whether network is soon congested.ECE (ECN-Echo, ECN feedback) is for showing whether receive a CE packet.CWR (Congestion Window Reduced, congestion window reduces by half) is for showing whether congestion window reduces by half.

Optionally, the first identifier and the second identifier represent with 1, and the 3rd identifier and the 4th identifier represent with 0.

It should be noted that, the first identifier is used for representing that ECT flag bit is selected, expresses support for ECN; The second identifier is used for representing that CE flag bit is selected, represents that network is about to occur congested; The 3rd identifier is used for representing that ECE flag bit is not selected, represents not receive a CE packet; The 4th identifier is used for representing that CWR is not selected, represents that congestion window does not reduce by half.

It should be noted that, the first identifier, the second identifier, the 3rd identifier and the 4th identifier be available other character representations also, as long as can express its effect separately, the present invention does not limit this.

Concrete, receiving terminal receives after packet, detects each flag bit of packet, with know whether to occur congested.If ECT flag bit detected, with the first identifier, identify, know that transmitting terminal supports ECN, CE identifies with the second identifier, knows in network, to be about to occur congested, and now receiving terminal need carry out congestion control.

The method of carrying out congestion control has three kinds, below three kinds of methods is described in detail respectively.

First method, at least two networks of transmitting terminal access receiving terminal, in not setting up the network of multipath TCP subflow, the newly-built multipath TCP of receiving terminal subflow, as shown in Figure 2, specific as follows described in.

201, in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described receiving terminal sends the first synchronizing sequence numbering SYN packet to described transmitting terminal.

Wherein, the described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information.Described MP_JOIN represents to add a multipath TCP subflow.

Concrete, when receiving terminal is set up multipath TCP subflow in the second Access Network, need first to consult ECN mechanism with transmitting terminal, receiving terminal is by identifying by the 5th identifier sign and CWR the ECE flag bit of a SYN packet with the 6th identifier, and ECT flag bit and described CE flag bit diverse ways, consult ECN mechanism to transmitting terminal.In the one SYN packet, also carry MP_JOIN information, for showing, at the second Access Network, add a multipath TCP subflow.Because receiving terminal and transmitting terminal have been set up multipath TCP subflow in the first Access Network, so when the second Access Network is set up multipath TCP subflow, need carry MP_JOIN information, what represent to set up is a multipath TCP subflow.

Need to say, the 5th identifier is used for representing that ECE flag bit is selected; The 6th identifier is used for representing that CWR is selected.Optionally, the 5th identifier and the 6th identifier represent with 1.

It should be noted that, in all embodiment of the present invention, described ECT flag bit is different from described CE flag bit refers to that the value of identifier of ECT flag bit and CE flag bit is different, for example, 1 sign for ECT flag bit, CE flag bit identifies with 0; Or, 0 sign for ECT flag bit, 1 sign for CE flag bit.

202, described receiving terminal receives the first synchronizing sequence numbering and the confirmation SYN-ACK packet that described transmitting terminal sends.

Wherein, the described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit.In described SYN-ACK packet, carry MP_JOIN information.

Concrete, the ECE flag bit in a SYN-ACK packet identifies with the 5th identifier, and CWR identifies with the 4th identifier, and described ECT flag bit expression transmitting terminals different from described CE flag bit are supported ECN mechanism.In SYN-ACK packet, carry MP_JOIN information, represent transmitting terminal agreement interpolation multipath TCP subflow.The one SYN-ACK packet is the response data packet of a SYN packet.

203, described receiving terminal sends and confirms ack msg bag to described transmitting terminal.

Wherein, in described ack msg bag, carry MP_JOIN information.

Concrete, receiving terminal sends ack msg bag, the response to a SYN-ACK packet to transmitting terminal after receiving a SYN-ACK packet.Complete the foundation of the multipath TCP subflow of carrying out three-way handshake process in the second Access Network.

Need to say, in all embodiment of the present invention, the second Access Network is the network different from the first Access Network.For example, the first Access Network is 3Gpp network, and the second Access Network is non-3Gpp network.

Second method, receiving terminal notice transmitting terminal receives a CE packet, allows transmitting terminal carry out congestion control, specific as follows.

Described receiving terminal sends the first response data packet to described transmitting terminal, so that described transmitting terminal carries out congestion control.

Wherein, the ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

Concrete, CE flag bit represents that by the 7th identifier sign CE flag bit is not selected, ECE flag bit represents that by the 5th identifier sign ECE is selected, receives a CE packet.Receiving terminal is about to occur congested by identifying each flag bit notice transmitting terminal network of the first response data packet, makes transmitting terminal carry out congestion control.

Wherein, the mode that transmitting terminal carries out congestion control has two kinds, a kind of be transmitting terminal in not setting up the network of multipath TCP subflow, initiate to set up the flow process of multipath TCP subflow, receiving terminal corresponding process specific as follows.

In the second Access Network, described receiving terminal receives the described SYN packet that described transmitting terminal sends.

Described receiving terminal sends a described SYN-ACK packet to described transmitting terminal.

Wherein, the described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit.In described SYN-ACK packet, carry MP_JOIN information, represent receiving terminal agreement interpolation multipath TCP subflow.

Described receiving terminal receives the ack msg bag that described transmitting terminal sends; In described ack msg bag, carry MP_JOIN information.

Concrete, receiving terminal receives the response data packet ack msg bag of a SYN-ACK packet of transmitting terminal transmission, show to have completed in the second Access Network and set up multipath TCP subflow, transmitting terminal can utilize this newly-built multipath TCP subflow to carry out the transmission of data, thereby slows down the congested of network.

The second way is that transmitting terminal carries out congestion control to the multipath TCP subflow of having set up, thereby slows down the congested of network.

The third method, receiving terminal carries out congestion control to the multipath TCP subflow of having set up, specific as follows.

Receiving terminal carries out congestion control to the multipath TCP subflow of having set up, and sends the second response data packet to transmitting terminal.

Wherein, the ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

Concrete, receiving terminal carries out congestion control to the multipath TCP subflow of having set up in the first Access Network, for example, the congestion window of multipath TCP subflow is reduced by half, and CWR flag bit is identified with the 6th identifier, represent that CWR flag bit is selected, represent that congestion window reduces by half, by identifying each flag bit notice transmitting terminal of the second response data packet, the multipath TCP subflow of having set up has been carried out to congestion control.

It should be noted that, at transmitting terminal, only by the first Access Network, be linked into receiving terminal, not by other network insertions in the situation of receiving terminal, it is congested that the method that receiving terminal carries out congestion control can be that the second notice transmitting terminal network is about to occur, and makes transmitting terminal carry out congestion control.Also the third, receiving terminal carries out congestion control to the multipath TCP subflow of having set up.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, and receiving terminal receives after packet, if the ECT flag bit of packet detected, with the first identifier, identifies, and CE flag bit identifies with the second identifier, carries out congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, as shown in Figure 3, comprising:

301, at least one Multipath Transmission control protocol TCP subflow that transmitting terminal has been set up at the first Access Network, to receiving terminal, send packet.

Wherein, the transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier, so that the network node of the first Access Network is when network being detected and be about to congested or the first Access Network link-quality variation, network node notifies described receiving terminal network to be about to congested or the first Access Network link-quality variation by the CE flag bit of packet is changed to the second identifier sign by the 7th identifier sign, so that described receiving terminal carries out congestion control.

Optionally, the first identifier and the second identifier represent with 1, and the 7th identifier, the 3rd identifier and the 4th identifier represent with 0.

It should be noted that, the first identifier is used for representing that ECT flag bit is selected, expresses support for ECN; The 7th identifier is used for representing that CE flag bit is not selected, represents that network can soon not occur congested; The 3rd identifier is used for representing that ECE flag bit is not selected, represents not receive a CE packet; The 4th identifier is used for representing that CWR is not selected, represents that congestion window does not reduce by half.

It should be noted that, the first identifier, the second identifier, the 7th identifier, the 3rd identifier and the 4th identifier be available other character representations also, as long as can express its effect separately, the present invention does not limit this.

Concrete, at least one Multipath Transmission control protocol TCP subflow that transmitting terminal has been set up at the first Access Network, through the network node of the first Access Network, to receiving terminal, send packet.Transmitting terminal is during by the network node of Packet Generation to the first Access Network, if network node detects network, be about to occur congested, the CE flag bit in packet being revised as to the second identifier by the 7th identifier sign identifies, and by the Packet Generation of having revised CE flag bit to receiving terminal, with notice receiving terminal network, be about to occur congested, make receiving terminal carry out congestion control.

It should be noted that, CE flag bit represents that by the second identifier sign CE flag bit is selected, and network is about to occur congested.

If 302 receiving terminals carry out congestion control, described transmitting terminal carries out corresponding congestion control.

Concrete, in the situation that receiving terminal carries out congestion control, the congestion control that transmitting terminal carries out according to receiving terminal, carries out congestion control, because receiving terminal carries out congestion control, has three kinds of methods, and the method that transmitting terminal carries out congestion control can be divided into three kinds.

First method, at least two networks of transmitting terminal access receiving terminal, in not setting up the network of multipath TCP subflow, by the newly-built multipath TCP of receiving terminal subflow, specific as follows described in.

In the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described transmitting terminal receives the first synchronizing sequence numbering SYN packet that described receiving terminal sends.

Wherein, the described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow.

Concrete, when receiving terminal is set up multipath TCP subflow in the second Access Network, need first to consult ECN mechanism with transmitting terminal, receiving terminal is by identifying by the 5th identifier sign and CWR the ECE flag bit of a SYN packet with the 6th identifier, and described ECT flag bit and described CE flag bit diverse ways, consult ECN mechanism to transmitting terminal.In the one SYN packet, also carry MP_JOIN information, for showing, at the second Access Network, add a multipath TCP subflow.

Described transmitting terminal sends the first synchronizing sequence numbering and confirms SYN-ACK packet to described receiving terminal.

Wherein, the described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information.

Concrete, transmitting terminal is supported ECN mechanism, by the response data packet of a SYN, is that the ECE flag bit of a SYN-ACK packet identifies with the 5th identifier, CWR identifies with the 4th identifier, and described ECT flag bit is different from described CE flag bit.In SYN-ACK packet, carry MP_JOIN information and show to agree to set up multipath TCP subflow in the second Access Network.

Described transmitting terminal receives the confirmation ack msg bag that described receiving terminal sends; In described ack msg bag, carry MP_JOIN information.

Concrete, transmitting terminal receives the response data packet ack msg bag of a SYN-ACK packet of receiving terminal transmission, show to complete in the second Access Network and set up multipath TCP subflow, can utilize this newly-built multipath TCP subflow to carry out the transmission of data, thereby reduce the congested of network.

Second method, receives a CE packet by receiving terminal notice transmitting terminal, by transmitting terminal, carries out congestion control, specific as follows.

Described transmitting terminal receives the first response data packet that described receiving terminal sends.

Concrete, ECE flag bit represents that by the 5th identifier sign ECE is selected, receives a CE packet.Transmitting terminal receives the first response data packet, ECE detected and identifies with the 5th identifier, illustrates that network is soon congested, and transmitting terminal carries out congestion control.

Optionally, the 5th identifier represents with 1.

Further, receiving terminal notice transmitting terminal network is about to occur congested, and the mode that transmitting terminal carries out congestion control has two kinds.A kind of mode is that transmitting terminal, in not setting up the network of multipath TCP subflow, initiates to set up the flow process of multipath TCP subflow.Illustrate below, as shown in Figure 4, comprising:

401, in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described transmitting terminal sends a described SYN packet to described receiving terminal.

Concrete, when transmitting terminal is set up multipath TCP subflow in the second Access Network, need first to consult ECN mechanism with receiving terminal, transmitting terminal is by identifying by the 5th identifier sign and CWR the ECE flag bit of a SYN packet with the 6th identifier, and described ECT flag bit and described CE flag bit diverse ways, consult ECN mechanism to receiving terminal.In the one SYN packet, also carry MP_JOIN information, for showing, at the second Access Network, add a multipath TCP subflow.Because transmitting terminal and receiving terminal have been set up multipath TCP subflow in the first Access Network, so when the second Access Network is set up multipath TCP subflow, need carry MP_JOIN information, what represent to set up is a multipath TCP subflow.

402, described transmitting terminal receives the described SYN-ACK packet that described receiving terminal sends.

Wherein, the described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier, and described ECT flag bit is different from described CE flag bit.In described SYN-ACK packet, carry MP_JOIN information.

Concrete, the ECE flag bit in a SYN-ACK packet identifies with the 5th identifier, and CWR identifies with the 4th identifier, and described ECT flag bit expression receiving terminals different from described CE flag bit are supported ECN mechanism.In SYN-ACK packet, carry MP_JOIN information, represent receiving terminal agreement interpolation multipath TCP subflow.The one SYN-ACK packet is the response data packet of a SYN packet.

403, described transmitting terminal sends described ack msg bag to described receiving terminal.

Wherein, in described ack msg bag, carry MP_JOIN information.

Concrete, transmitting terminal sends ack msg bag, the response to a SYN-ACK packet to receiving terminal after receiving a SYN-ACK packet.Complete the foundation of the multipath TCP subflow of carrying out three-way handshake process in the second Access Network.

Another kind of mode is that transmitting terminal carries out congestion control to the multipath TCP subflow of having set up, specific as follows.

Concrete, transmitting terminal carries out congestion control to the multipath TCP subflow of having set up in the first Access Network, for example, the congestion window of multipath TCP subflow is reduced by half, transmitting terminal transmits packet according to the congestion window after reducing by half in multipath TCP subflow, thereby reduced the number that sends packet, can effectively slow down network congestion.

It should be noted that, by receiving terminal notice transmitting terminal, receiving a CE packet, by transmitting terminal, undertaken in the situation of congestion control, if transmitting terminal is only by the first Access Network access receiving terminal, during not by other network insertion receiving terminals, transmitting terminal can first send the second Access Network connection message to receiving terminal, make transmitting terminal pass through the second Access Network access receiving terminal, carry out again corresponding congestion control, for example, the first kind of way of the second jamming control method.Transmitting terminal also can directly carry out congestion control to the multipath TCP subflow of having set up, for example, and the second way of the second jamming control method.

The third method, transmitting terminal knows that receiving terminal reduces by half congestion window, specific as follows.

Described transmitting terminal receives the second response data packet that described receiving terminal sends.

Concrete, CWR identifies with the 6th identifier, represents that CWR is selected, represents that receiving terminal reduces by half the congestion window of the multipath TCP subflow of having set up.Transmitting terminal, according to the size of the congestion window of the multipath TCP subflow of having set up, at the multipath TCP subflow transmission packet of having set up, thereby has reduced the number that sends packet, can effectively slow down network congestion.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, transmitting terminal sends packet at least one multipath TCP subflow of having set up of the first Access Network, if it is soon congested that the network node of the first Access Network detects network, the ECT flag bit in packet is identified with the first identifier, CE flag bit identifies with the second identifier, ECE flag bit identifies with the 3rd identifier, CWR flag bit is sent to receiving terminal by the 4th identifier sign, so that receiving terminal receives after packet, the CE flag bit that packet detected identifies with the second identifier, carry out congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, as shown in Figure 5, comprising:

501, described transmitting terminal sends the 2nd SYN packet to described receiving terminal, and receiving terminal receives the 2nd SYN packet that described transmitting terminal sends in the first Access Network, records the relevant information of the MP_CAPABLE of described transmitting terminal, port numbers, and IP address; And forward described the 2nd SYN packet to the server of Correspondent Node.

Wherein, the ECE flag bit in described the 2nd SYN packet identifies with the 5th identifier, and described CWR flag bit identifies with six identifiers; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN packet, carry multipath ability MP_CAPABLE information; Described MP_CAPABLE is used for identifying transmitting terminal and supports multipath TCP.

Optionally, the 5th identifier and the 6th identifier represent with 1.

Concrete, when transmitting terminal is initially set up multipath TCP subflow in the first Access Network, need first to consult ECN mechanism with receiving terminal, transmitting terminal is by identifying by the 5th identifier sign and CWR the ECE flag bit of the 2nd SYN packet with the 6th identifier, and described ECT flag bit and described CE flag bit diverse ways, consult ECN mechanism to receiving terminal.In the one SYN packet, also carry MP_CAPABLE information, for showing transmitting terminal support multipath TCP, and in the first Access Network, set up a multipath TCP subflow.

502, described receiving terminal receives the 2nd SYN-ACK packet of the server transmission of described Correspondent Node.

Concrete, the described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit.

If 503 described receiving terminals detect in described the 2nd SYN-ACK packet and do not carry MP_CAPABLE information, described MP_CAPABLE is added in described the 2nd SYN-ACK packet, with the 8th identifier, identifies the P flag bit of described the 2nd SYN-ACK packet.

Concrete, receiving terminal detects in the 2nd SYN-ACK packet and does not carry MP_CAPABLE information, the server that Correspondent Node is described is not supported multipath TCP, receiving terminal is added into MP_CAPABLE in described the 2nd SYN-ACK packet, and with the 8th identifier, identify the P flag bit of this 2nd SYN-ACK packet, so that transmitting terminal knows that by this P flag bit the server of Correspondent Node do not support multipath TCP, by receiving terminal and transmitting terminal, set up multipath TCP subflow.

Receiving terminal records the port numbers of transmitting terminal, and IP address, and the relevant information of the MP_CAPABLE of transmitting terminal, so that the foundation of multipath TCP subflow.

Optionally, the 8th identifier represents with 1.

It should be noted that, the 8th identifier is used for representing that P flag bit is selected, and the 8th identifier is available other character representations also, as long as can express its effect separately, the present invention does not limit this.

504, receiving terminal is by described the 2nd SYN-ACK Packet Generation to described transmitting terminal, and described transmitting terminal receives the 2nd SYN-ACK packet that described receiving terminal sends.

Wherein, the described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN-ACK packet, also carry MP_CAPABLE information; The P flag bit of described the 2nd SYN-ACK packet identifies with the 8th identifier.

505, described transmitting terminal sends ack msg bag to described receiving terminal, and described receiving terminal receives the ack msg bag that described transmitting terminal sends, and described ack msg bag is sent to the server of Correspondent Node.

Concrete, transmitting terminal receives after the 2nd SYN-ACK packet, send response data packet ack msg bag to receiving terminal, receiving terminal is also sent to this ack msg bag the server of Correspondent Node, like this, between transmitting terminal and receiving terminal, in the first Access Network, set up multipath TCP subflow, receiving terminal has been set up TCP with the server of Correspondent Node and has been connected.

506, identical with step 301, do not repeat them here.

507, identical with step 101, do not repeat them here.

508, identical with step 102, do not repeat them here.

509, identical with step 302, do not repeat them here.

It should be noted that, receiving terminal is for supporting the proxy server of multipath TCP, and the server of the Correspondent Node of transmitting terminal is not supported multipath TCP.

It should be noted that, receiving terminal and the server of Correspondent Node carry out congestion control and are connected with TCP in prior art that to carry out the method for congestion control identical, at this, are not described further.

It should be noted that, in all embodiment of the present invention, in the situation that the first Access Network has been set up multipath TCP subflow, if in the first Access Network during newly-built multipath TCP subflow, the method of newly-built multipath TCP subflow with in above-described embodiment in the second Access Network the step of newly-built multipath TCP subflow identical, therefore not to repeat here.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, transmitting terminal sends packet at least one multipath TCP subflow of having set up of the first Access Network, if it is soon congested that the network node of the first Access Network detects network, the ECT flag bit in packet is identified with the first identifier, CE flag bit identifies with the second identifier, ECE flag bit identifies with the 3rd identifier, CWR flag bit is sent to receiving terminal by the 4th identifier sign, receiving terminal receives after packet, the CE flag bit that packet detected identifies with the second identifier, carry out congestion control, be in not setting up the second Access Network of TCP subflow newly-built multipath TCP subflow or the TCP subflow of having set up is carried out to congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data, and by newly-built multipath TCP subflow in the second Access Network, slowed down the network congestion in the first Access Network.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, as shown in Figure 6, comprising:

601, described transmitting terminal sends the 2nd SYN packet to described receiving terminal, and described receiving terminal receives described the 2nd SYN packet that described transmitting terminal sends in the first Access Network.

Concrete, when transmitting terminal is initially set up multipath TCP subflow in the first Access Network, need first to consult ECN mechanism with receiving terminal, transmitting terminal is by identifying by the 5th identifier sign and CWR the ECE flag bit of the 2nd SYN packet with the 6th identifier, and described ECT flag bit and described CE flag bit diverse ways, consult ECN mechanism to receiving terminal.In the one SYN packet, also carry MP_CAPABLE information, for showing, at the first Access Network, set up a multipath TCP subflow.

Optionally, the 5th identifier and the 6th identifier represent with 1.

602, described receiving terminal sends Three S's YN-ACK packet to described transmitting terminal, and described transmitting terminal receives the Three S's YN-ACK packet that described receiving terminal sends.

Wherein, the described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE.

603, described transmitting terminal sends ack msg bag to described receiving terminal, and described receiving terminal receives the ack msg bag that described transmitting terminal sends.

Concrete, transmitting terminal receives after the 2nd SYN-ACK packet, sends response data packet ack msg bag to receiving terminal, like this, has set up multipath TCP subflow between transmitting terminal and receiving terminal in the first Access Network.

604, described transmitting terminal sends and comprises the address information of adding address AD D_ADDR information to receiving terminal, so that described receiving terminal obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

Concrete, in ADD_ADDR information, there is the Internet protocol IP address of transmitting terminal in the second Access Network.

605, described receiving terminal receives the address information that comprises interpolation address AD D_ADDR information that described transmitting terminal sends, and obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

Concrete, receiving terminal is by the Internet protocol IP address of transmitting terminal in the second Access Network described in the ADD_ADDR acquisition of information of address information.

606, identical with step 301, do not repeat them here.

607, identical with step 101, do not repeat them here.

608, identical with step 102, do not repeat them here.

609, identical with step 302, do not repeat them here.

It should be noted that, the server that receiving terminal is Correspondent Node, the server that is Correspondent Node is supported multipath TCP.

It should be noted that, step 605 is before step 608, and step 606, the order of 607 do not limit.

The embodiment of the present invention provides a kind of device of multipath TCP congestion control, as shown in Figure 7, comprising:

Receiving element 701, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for receiving end/sending end, the packet sending through the network node of the first Access Network.

Processing unit 702, identifies with the first identifier for the transmission ECT flag bit the support ecn (explicit congestion notification) ECN of described packet being detected; In the situation of congestion alarm CE flag bit by the second identifier sign, described receiving terminal carries out congestion control.

Concrete, processing unit 702, as shown in Figure 8, specifically comprises: the first sending module 7021, the first receiver modules 7022.

Described the first sending module 7021, for in the situation that described transmitting terminal accesses described device by the second Access Network, if described transmitting terminal and described device are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described transmitting terminal, send the first synchronizing sequence numbering SYN packet.

Wherein, the described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN information represents to add a multipath TCP subflow.

Described the first receiver module 7022, the first synchronizing sequence numbering and the confirmation SYN-ACK packet that for receiving described transmitting terminal, send.

Described the first sending module 7021, also for sending and confirm ack msg bag to described transmitting terminal.

Wherein, in described ack msg bag, carry MP_JOIN information.

Above-mentioned receiving element 701, the address information that comprises interpolation address AD D_ADDR information also sending for receiving described transmitting terminal.

Described device, as shown in Figure 9, also comprises:

Acquiring unit 703, obtains described transmitting terminal in the Internet protocol IP address of the second Access Network for the described address information receiving according to described receiving element 701.

Or, described processing unit 702 specifically for, to described transmitting terminal, send the first response data packet, so that described transmitting terminal carries out congestion control.

Now, described receiving element 701, also, at the second Access Network, receives the described SYN packet that described transmitting terminal sends.

Described device, as shown in figure 10, also comprises:

The first transmitting element 704, for sending a described SYN-ACK packet to described transmitting terminal.

Described receiving element 701, the ack msg bag also sending for receiving described transmitting terminal.

Or, described processing unit 702 specifically for, the multipath TCP subflow of having set up is carried out to congestion control, and sends the second response data packet to transmitting terminal.

Above-mentioned receiving element 701, the 2nd SYN packet also sending at the first Access Network for receiving described transmitting terminal.

Described device, as shown in figure 11, also comprises:

Record cell 707, for recording the relevant information of the MP_CAPABLE of described transmitting terminal, port numbers, and IP address.

The second transmitting element 705, for sending described the 2nd SYN packet to the server of Correspondent Node.

Described receiving element 701, the 2nd SYN-ACK packet also sending for receiving the server of described Correspondent Node.

Wherein, the described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit.

Described device, shown in Figure 11, also comprises:

Detecting unit 706, for detection of whether carrying MP_CAPABLE information in described the 2nd SYN-ACK packet.

Described processing unit 702, also when described the 2nd SYN-ACK packet being detected at detecting unit 706 and not carrying MP_CAPABLE information, described MP_CAPABLE is added in described the 2nd SYN-ACK packet, with the 8th identifier, identifies the P flag bit of described the 2nd SYN-ACK packet.

Described the first transmitting element 704, also for by described the 2nd SYN-ACK Packet Generation to described transmitting terminal.

Described the second transmitting element 705, also for being sent to described ack msg bag the server of Correspondent Node.

Above-mentioned receiving element 701, described the 2nd SYN packet also sending at the first Access Network for receiving described transmitting terminal.

Described the first transmitting element 704, also for sending Three S's YN-ACK packet to described transmitting terminal.

Wherein.Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE.

The embodiment of the present invention provides a kind of device of multipath TCP congestion control, receiving terminal receives after packet, the CE flag bit that packet detected identifies with the second identifier, carry out congestion control, be in not setting up the second Access Network of TCP subflow newly-built multipath TCP subflow or the TCP subflow of having set up is carried out to congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data, and by newly-built multipath TCP subflow in the second Access Network, slowed down the network congestion in the first Access Network.

The embodiment of the present invention provides a kind of device of multipath TCP congestion control, as shown in figure 12, comprising:

Transmitting element 111, sends packet at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network to receiving terminal.

Wherein, the transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; So that the network node of the first Access Network is when network being detected and be about to congested or the first Access Network link-quality variation, network node notifies described receiving terminal network to be about to congested or the first Access Network link-quality variation by the CE flag bit of packet is changed to the second identifier sign by the 7th identifier sign, so that described receiving terminal carries out congestion control.

Processing unit 112, carries out for receiving terminal, in the situation of congestion control, carrying out corresponding congestion control.

Concrete, described processing unit 112, as shown in figure 13, comprising: receiver module 1121 and sending module 1122.

Wherein, described receiver module 1121, for in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described device and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, receive the first synchronizing sequence numbering SYN packet that described receiving terminal sends.

Described sending module 1122, for sending the first synchronizing sequence numbering and confirming SYN-ACK packet to described receiving terminal.

Described receiver module 1121, the confirmation ack msg bag also sending for receiving described receiving terminal.

Wherein, in described ack msg bag, carry MP_JOIN information.

Now, described transmitting element 111, also for sending and comprise the address information of adding address AD D_ADDR information to receiving terminal, so that described receiving terminal obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

Or, described processing unit 112 specifically for, receive the first response data packet that described receiving terminal sends.

Now, described transmitting element 111, also in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described receiving terminal, send a described SYN packet.

Described device, as shown in figure 14, also comprises:

Receiving element 113, the described SYN-ACK packet sending for receiving described receiving terminal.

Described transmitting element 111, also for sending described ack msg bag to described receiving terminal.

Described processing unit 112, also carries out congestion control for the multipath TCP subflow to having set up.

Or, described processing unit 112 specifically for, receive the second response data packet that described receiving terminal sends.

Above-mentioned transmitting element 111, also for sending the 2nd SYN packet to described receiving terminal.

Described receiving element 113, the 2nd SYN-ACK packet or the Three S's YN-ACK packet that also for receiving described receiving terminal, send.

Wherein, the described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN-ACK packet, also carry MP_CAPABLE information; The P flag bit land used eight identifier signs of described the 2nd SYN-ACK packet; Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE information.

Described transmitting element 111, also for sending ack msg bag to described receiving terminal.

The embodiment of the present invention provides a kind of device of multipath TCP congestion control, transmitting terminal sends packet at least one multipath TCP subflow of having set up of the first Access Network, if it is soon congested that the network node of the first Access Network detects network, the ECT flag bit in packet is identified with the first identifier, CE flag bit identifies with the second identifier, ECE flag bit identifies with the 3rd identifier, CWR flag bit is sent to receiving terminal by the 4th identifier sign, so that receiving terminal receives after packet, the CE flag bit that packet detected identifies with the second identifier, carry out congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data.

The embodiment of the present invention provides a kind of device of multipath TCP congestion control, as shown in figure 15, comprising:

Receiver 121, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for receiving terminal receiving end/sending end, the packet sending through the network node of the first Access Network.

Processor 122, if identify with the first identifier for the transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet being detected; Congestion alarm CE flag bit identifies with the second identifier, and described receiving terminal carries out congestion control.

Concrete, described processor specifically for, in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described transmitting terminal, send the first synchronizing sequence numbering SYN packet.

Described receiver 121, the first synchronizing sequence numbering and the confirmation SYN-ACK packet that also for receiving described transmitting terminal, send.

Described processor 122 also for, to described transmitting terminal, send and confirm ack msg bag.

Wherein, in described ack msg bag, carry MP_JOIN information.

Described receiver 121 also for, receive the address information of adding address AD D_ADDR information that comprises that described transmitting terminal sends.

Described processor 122 also for, the described address information receiving according to receiver 121 is obtained the Internet protocol IP address of described transmitting terminal in the second Access Network.

Or above-mentioned processor 122, sends the first response data packet specifically for described receiving terminal to described transmitting terminal, so that described transmitting terminal carries out congestion control.

Above-mentioned receiver 121 also for, in the second Access Network, receive the described SYN packet that described transmitting terminal sends.

Described processor 122 also for, to described transmitting terminal, send a described SYN-ACK packet.

Above-mentioned receiver 121 also for, receive the ack msg bag that described transmitting terminal sends.

Or above-mentioned processor 122, carries out congestion control specifically for the multipath TCP subflow to having set up, and sends the second response data packet to transmitting terminal.

Above-mentioned receiver 121, the 2nd SYN packet also sending at the first Access Network for receiving described transmitting terminal.

Described processor 122, also for; Record the relevant information of the MP_CAPABLE of described transmitting terminal, port numbers, and IP address.

Said apparatus, as shown in figure 16, also comprises:

Transmitter 123, for sending described the 2nd SYN packet to the server of Correspondent Node.

Above-mentioned receiver 121 also for, receive the 2nd SYN-ACK packet that the server of described Correspondent Node sends.

Described processor 122 also for, detect in described the 2nd SYN-ACK packet whether carry MP_CAPABLE information.

Described processor 122 also for, while not carrying MP_CAPABLE information in described the 2nd SYN-ACK packet being detected, described MP_CAPABLE is added in described the 2nd SYN-ACK packet, with the 8th identifier, identifies the P flag bit of described the 2nd SYN-ACK packet.

Described transmitter 123 also for, by described the 2nd SYN-ACK Packet Generation to described transmitting terminal.

Described receiver 122 also for, receive the ack msg bag that described transmitting terminal sends.

Described transmitter 123 also for, for described ack msg bag being sent to the server of Correspondent Node.

Above-mentioned receiver 122 also for, receive described the 2nd SYN packet that described transmitting terminal sends in the first Access Network.

Above-mentioned transmitter 122 also for, send Three S's YN-ACK packet to described transmitting terminal.

Above-mentioned receiver 122 also for, receive the ack msg bag that described transmitting terminal sends.

The embodiment of the present invention provides a kind of device of multipath TCP congestion control, as shown in figure 17, comprising:

Transmitter 141, sends packet at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network to receiving terminal.

Processor 142, carries out for receiving terminal, in the situation of congestion control, carrying out corresponding congestion control.

Concrete, described processor 142, for in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described device and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, receive the first synchronizing sequence numbering SYN packet that described receiving terminal sends.

Described processor 142, also for sending the first synchronizing sequence numbering and confirming SYN-ACK packet to described receiving terminal.

Described processor 142, the confirmation ack msg bag also sending for receiving described receiving terminal.

Wherein, in described ack msg bag, carry MP_JOIN information.

Above-mentioned transmitter 141 also for, to receiving terminal, send and to comprise the address information of adding address AD D_ADDR information, so that described receiving terminal obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

Or, described processor 142 specifically for, receive the first response data packet that described receiving terminal sends.

Above-mentioned transmitter 141 also for, in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described receiving terminal, send a described SYN packet.

Described device, as shown in figure 18, also comprises:

Receiver 143, the described SYN-ACK packet sending for receiving described receiving terminal.

Above-mentioned transmitter 141 also for, to described receiving terminal, send described ack msg bag.

Described processor 142 also for, the multipath TCP subflow of having set up is carried out to congestion control.

Or, described processor 142 specifically for, receive the second response data packet that described receiving terminal sends.

Above-mentioned transmitter 141 also for, to described receiving terminal, send the 2nd SYN packet.

Described receiver 143 also for, receive the 2nd SYN-ACK packet or Three S's YN-ACK packet that described receiving terminal sends.

Wherein, the described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN-ACK packet, also carry MP_CAPABLE information; The P flag bit land used eight identifier signs of described the 2nd SYN-ACK packet.Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE information.

Above-mentioned transmitter 141 also for, to described receiving terminal, send ack msg bag.

The embodiment of the present invention provides a kind of system of multipath TCP congestion control, as shown in figure 19, comprising: transmitting terminal 161, network node 162, receiving terminal 163.

Described transmitting terminal 161 is the transmitting terminal of the device of a kind of multipath TCP congestion control described in above-described embodiment.

The receiving terminal of the device of a kind of multipath TCP congestion control that described receiving terminal 163 provides for above-described embodiment.

The embodiment of the present invention provides the system of another kind of multipath TCP congestion control, as shown in figure 20, comprising: transmitting terminal 201, network node 202, receiving terminal 203.

Described transmitting terminal 201 is the device of the another kind of multipath TCP congestion control described in above-described embodiment.

Described receiving terminal 203 is the device of the another kind of multipath TCP congestion control described in above-described embodiment.

The embodiment of the present invention provides a kind of method of multipath TCP congestion control, Apparatus and system, transmitting terminal sends packet at least one multipath TCP subflow of having set up of the first Access Network, if it is soon congested that the network node of the first Access Network detects network, the ECT flag bit in packet is identified with the first identifier, CE flag bit identifies with the second identifier, ECE flag bit identifies with the 3rd identifier, CWR flag bit is sent to receiving terminal by the 4th identifier sign, receiving terminal receives after packet, the CE flag bit that packet detected identifies with the second identifier, carry out congestion control, be in not setting up the second Access Network of TCP subflow newly-built multipath TCP subflow or the TCP subflow of having set up is carried out to congestion control.Like this, realized before congested generation, carried out congestion control, improved the efficiency of transfer of data, and by newly-built multipath TCP subflow in the second Access Network, slowed down the network congestion in the first Access Network.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims

1. a method for multipath TCP congestion control, is characterized in that, comprising:

In at least one Multipath Transmission control protocol TCP subflow that receiving terminal receiving end/sending end has been set up at the first Access Network, the packet sending through the network node of the first Access Network;

2. method according to claim 1, it is characterized in that, the described congestion control that carries out comprises: in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described receiving terminal sends the first synchronizing sequence numbering SYN packet to described transmitting terminal; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow;

Described receiving terminal receives the first synchronizing sequence numbering and the confirmation SYN-ACK packet that described transmitting terminal sends; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information;

Described receiving terminal sends and confirms ack msg bag to described transmitting terminal; In described ack msg bag, carry MP_JOIN information.

3. method according to claim 2, is characterized in that, before described receiving terminal is set up the message of multipath TCP subflow to described transmitting terminal transmission, also comprises:

Described receiving terminal receives the address information that comprises interpolation address AD D_ADDR information that described transmitting terminal sends, and obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

4. method according to claim 1, is characterized in that, described in carry out congestion control and comprise: described receiving terminal sends the first response data packet to described transmitting terminal, so that described transmitting terminal carries out congestion control; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

5. method according to claim 4, is characterized in that, at described receiving terminal, after described transmitting terminal sends the first response data packet, also comprises:

In the second Access Network, described receiving terminal receives the described SYN packet that described transmitting terminal sends;

Described receiving terminal sends a described SYN-ACK packet to described transmitting terminal;

Described receiving terminal receives the ack msg bag that described transmitting terminal sends.

6. method according to claim 1, is characterized in that, described in carry out congestion control and comprise: the multipath TCP subflow of having set up is carried out to congestion control, and sends the second response data packet to transmitting terminal; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

7. according to the method described in claim 1,2,4-5 any one, it is characterized in that, in at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network at described receiving terminal receiving end/sending end, before the packet sending through the network node of the first Access Network, also comprise:

Described receiving terminal receives the 2nd SYN packet that described transmitting terminal sends in the first Access Network, records the relevant information of the MP_CAPABLE of described transmitting terminal, port numbers, and IP address; And forward described the 2nd SYN packet to the server of Correspondent Node; ECE flag bit in described the 2nd SYN packet identifies with the 5th identifier, and described CWR flag bit identifies with six identifiers; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN packet, carry multipath ability MP_CAPABLE information; Described MP_CAPABLE is used for identifying transmitting terminal and supports multipath TCP;

Described receiving terminal receives the 2nd SYN-ACK packet of the server transmission of described Correspondent Node; The described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit;

If described receiving terminal detects in described the 2nd SYN-ACK packet and does not carry MP_CAPABLE information, described MP_CAPABLE is added in described the 2nd SYN-ACK packet, with the 8th identifier, identify the P flag bit of described the 2nd SYN-ACK packet;

Described receiving terminal by described the 2nd SYN-ACK Packet Generation to described transmitting terminal;

Described receiving terminal receives the ack msg bag that described transmitting terminal sends, and described ack msg bag is sent to the server of Correspondent Node.

8. according to the method described in claim 1-6 any one, it is characterized in that, in at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network at described receiving terminal receiving end/sending end, before the packet sending through the network node of the first Access Network, also comprise:

Described receiving terminal receives described the 2nd SYN packet that described transmitting terminal sends in the first Access Network;

Described receiving terminal sends Three S's YN-ACK packet to described transmitting terminal; Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE;

9. a method for multipath TCP congestion control, is characterized in that, comprising:

In at least one Multipath Transmission control protocol TCP subflow that transmitting terminal has been set up at the first Access Network, to receiving terminal, send packet; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier, so that the network node of the first Access Network is when network being detected and be about to congested or the first Access Network link-quality variation, network node notifies described receiving terminal network to be about to congested or the first Access Network link-quality variation by the CE flag bit of packet is changed to the second identifier sign by the 7th identifier sign, so that described receiving terminal carries out congestion control;

If receiving terminal carries out congestion control, described transmitting terminal carries out corresponding congestion control.

10. method according to claim 9, it is characterized in that, described transmitting terminal carries out corresponding congestion control and comprises: in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described transmitting terminal receives the first synchronizing sequence numbering SYN packet that described receiving terminal sends; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow;

Described transmitting terminal sends the first synchronizing sequence numbering and confirms SYN-ACK packet to described receiving terminal; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information;

11. methods according to claim 10, is characterized in that, before receiving the message of the multipath TCP subflow that described receiving terminal sends, also comprise at described transmitting terminal:

Described transmitting terminal sends and comprises the address information of adding address AD D_ADDR information to receiving terminal, so that described receiving terminal obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

12. methods according to claim 9, is characterized in that, described transmitting terminal carries out corresponding congestion control and comprises:

Described transmitting terminal receives the first response data packet that described receiving terminal sends; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

13. methods according to claim 12, it is characterized in that, after described transmitting terminal receives the first response data of described receiving terminal transmission, also comprise: in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, described transmitting terminal sends a described SYN packet to described receiving terminal;

Described transmitting terminal receives the described SYN-ACK packet that described receiving terminal sends;

Described transmitting terminal sends described ack msg bag to described receiving terminal.

14. methods according to claim 12, is characterized in that, after described transmitting terminal receives the first response data of described receiving terminal transmission, also comprise:

Described transmitting terminal carries out congestion control to the multipath TCP subflow of having set up.

15. methods according to claim 9, is characterized in that, described transmitting terminal carries out corresponding congestion control and comprises:

Described transmitting terminal receives the second response data packet that described receiving terminal sends; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

16. according to the method described in claim 9-15 any one, it is characterized in that, before sending packet, also comprises at described transmitting terminal at the first Access Network in the Multipath Transmission control protocol TCP subflow of having set up to receiving terminal:

Described transmitting terminal sends the 2nd SYN packet to described receiving terminal; ECE flag bit in described the 2nd SYN packet identifies with the 5th identifier, and described CWR flag bit identifies with six identifiers; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN packet, carry multipath ability MP_CAPABLE information; Described MP_CAPABLE is used for identifying transmitting terminal and supports multipath TCP;

Described transmitting terminal receives the 2nd SYN-ACK packet or the Three S's YN-ACK packet that described receiving terminal sends; The described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN-ACK packet, also carry MP_CAPABLE information; The P flag bit land used eight identifier signs of described the 2nd SYN-ACK packet; Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE information;

Described transmitting terminal sends ack msg bag to described receiving terminal.

The device of 17. 1 kinds of multipath TCP congestion controls, is characterized in that, comprising:

Receiving element, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for receiving end/sending end, the packet sending through the network node of the first Access Network;

Processing unit, identifies with the first identifier for the transmission ECT flag bit the support ecn (explicit congestion notification) ECN of described packet being detected; In the situation of congestion alarm CE flag bit by the second identifier sign, described receiving terminal carries out congestion control; Wherein, the ECN of described packet feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier.

18. devices according to claim 17, is characterized in that, described processing unit specifically comprises: the first sending module, the first receiver module;

Described the first sending module, for in the situation that described transmitting terminal accesses described device by the second Access Network, if described transmitting terminal and described device are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described transmitting terminal, send the first synchronizing sequence numbering SYN packet; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN information represents to add a multipath TCP subflow;

Described the first receiver module, the first synchronizing sequence numbering and the confirmation SYN-ACK packet that for receiving described transmitting terminal, send; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information;

Described the first sending module, also for sending and confirm ack msg bag to described transmitting terminal; In described ack msg bag, carry MP_JOIN information.

19. devices according to claim 18, is characterized in that,

Described receiving element, the address information that comprises interpolation address AD D_ADDR information also sending for receiving described transmitting terminal;

Described device, also comprises:

Acquiring unit, obtains described transmitting terminal in the Internet protocol IP address of the second Access Network for the described address information receiving according to described receiving element.

20. devices according to claim 17, is characterized in that, described processing unit specifically for, to described transmitting terminal, send the first response data packet, so that described transmitting terminal carries out congestion control; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

21. devices according to claim 20, is characterized in that, described receiving element also, at the second Access Network, receives the described SYN packet that described transmitting terminal sends;

Described device, also comprises:

The first transmitting element, for sending a described SYN-ACK packet to described transmitting terminal;

Described receiving element, the ack msg bag also sending for receiving described transmitting terminal.

22. devices according to claim 17, is characterized in that, described processing unit specifically for, the multipath TCP subflow of having set up is carried out to congestion control, and sends the second response data packet to transmitting terminal; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

23. according to the device described in claim 17,18,20-22 any one, it is characterized in that described receiving element, the 2nd SYN packet also sending at the first Access Network for receiving described transmitting terminal; ECE flag bit in described the 2nd SYN packet identifies with the 5th identifier, and described CWR flag bit identifies with six identifiers; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN packet, carry multipath ability MP_CAPABLE information; Described MP_CAPABLE is used for identifying transmitting terminal and supports multipath TCP;

Described device, also comprises:

Record cell, for recording the relevant information of the MP_CAPABLE of described transmitting terminal, port numbers, and IP address;

The second transmitting element, for sending described the 2nd SYN packet to the server of Correspondent Node;

Described receiving element, the 2nd SYN-ACK packet also sending for receiving the server of described Correspondent Node; The described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit;

Described device, also comprises:

Detecting unit, for detection of whether carrying MP_CAPABLE information in described the 2nd SYN-ACK packet;

Described processing unit, also when described the 2nd SYN-ACK packet being detected at detecting unit and not carrying MP_CAPABLE information, described MP_CAPABLE is added in described the 2nd SYN-ACK packet, with the 8th identifier, identifies the P flag bit of described the 2nd SYN-ACK packet;

Described the first transmitting element, also for by described the 2nd SYN-ACK Packet Generation to described transmitting terminal;

Described receiving element, the ack msg bag also sending for receiving described transmitting terminal;

Described the second transmitting element, also for being sent to described ack msg bag the server of Correspondent Node.

24. according to the device described in claim 17-22 any one, it is characterized in that, also comprises:

Described receiving element, described the 2nd SYN packet also sending at the first Access Network for receiving described transmitting terminal;

Described the first transmitting element, also for sending Three S's YN-ACK packet to described transmitting terminal; Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE;

The device of 25. 1 kinds of multipath TCP congestion controls, is characterized in that, comprising:

Transmitting element, sends packet at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network to receiving terminal; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; So that the network node of the first Access Network is when network being detected and be about to congested or the first Access Network link-quality variation, network node notifies described receiving terminal network to be about to congested or the first Access Network link-quality variation by the CE flag bit of packet is changed to the second identifier sign by the 7th identifier sign, so that described receiving terminal carries out congestion control;

Processing unit, carries out for receiving terminal, in the situation of congestion control, carrying out corresponding congestion control.

26. devices according to claim 25, is characterized in that, described processing unit comprises: receiver module and sending module;

Described receiver module, for in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described device and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, receive the first synchronizing sequence numbering SYN packet that described receiving terminal sends; The described ECE flag bit of a described SYN packet identifies with the 5th identifier; Described CWR identifies with the 6th identifier; And described ECT flag bit is different from described CE flag bit; In a described SYN packet, also carry multipath and add MP_JOIN information; Described MP_JOIN represents to add a multipath TCP subflow;

Described sending module, for sending the first synchronizing sequence numbering and confirming SYN-ACK packet to described receiving terminal; Described ECE flag bit in a described SYN-ACK packet identifies with the 5th identifier; Described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described SYN-ACK packet, carry MP_JOIN information;

Described receiver module, the confirmation ack msg bag also sending for receiving described receiving terminal; In described ack msg bag, carry MP_JOIN information.

27. devices according to claim 26, is characterized in that,

Described transmitting element, also for sending and comprise the address information of adding address AD D_ADDR information to receiving terminal, so that described receiving terminal obtains the Internet protocol IP address of described transmitting terminal in the second Access Network according to described address information.

28. devices according to claim 25, is characterized in that, described processing unit specifically for, receive the first response data packet that described receiving terminal sends; The ECT flag bit of described the first response data packet identifies with the first identifier, and described CE flag bit identifies with the 7th identifier; Described ECE flag bit identifies with the 5th identifier; Described CWR flag bit identifies with the 4th identifier.

29. devices according to claim 28, is characterized in that,

Described transmitting element, also in the situation that described transmitting terminal accesses described receiving terminal by the second Access Network, if described transmitting terminal and described receiving terminal are not set up multipath TCP subflow in the second Access Network,, in the second Access Network, to described receiving terminal, send a described SYN packet;

Described device, also comprises:

Receiving element, the described SYN-ACK packet sending for receiving described receiving terminal;

Described transmitting element, also for sending described ack msg bag to described receiving terminal.

30. devices according to claim 28, is characterized in that,

Described processing unit, also carries out congestion control for the multipath TCP subflow to having set up.

31. devices according to claim 25, is characterized in that, described processing unit specifically for, receive the second response data packet that described receiving terminal sends; The ECT flag bit of described the second response data packet identifies with the first identifier, and described CE flag bit identifies with seven identifiers; Described ECE flag bit identifies with the 3rd identifier; Described CWR flag bit identifies with the 6th identifier.

32. according to the method described in claim 25-31 any one, it is characterized in that,

Described transmitting element, also for sending the 2nd SYN packet to described receiving terminal; ECE flag bit in described the 2nd SYN packet identifies with the 5th identifier, and described CWR flag bit identifies with six identifiers; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN packet, carry multipath ability MP_CAPABLE information; Described MP_CAPABLE is used for identifying transmitting terminal and supports multipath TCP;

Described receiving element, the 2nd SYN-ACK packet or the Three S's YN-ACK packet that also for receiving described receiving terminal, send; The described ECE flag bit of described the 2nd SYN-ACK packet identifies with the 5th identifier; CWR flag bit the 4th identifier sign; And described ECT flag bit is different from described CE flag bit; In described the 2nd SYN-ACK packet, also carry MP_CAPABLE information; The P flag bit land used eight identifier signs of described the 2nd SYN-ACK packet; Described ECE flag bit in described Three S's YN-ACK packet identifies with the 5th identifier, and described CWR identifies with the 4th identifier; And described ECT flag bit is different from described CE flag bit; In described Three S's YN-ACK packet, also carry MP_CAPABLE information;

Described transmitting element, also for sending ack msg bag to described receiving terminal.

The device of 33. 1 kinds of multipath TCP congestion controls, is characterized in that, comprising:

Receiver, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for receiving terminal receiving end/sending end, the packet sending through the network node of the first Access Network;

Processor, if identify with the first identifier for the transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet being detected; Congestion alarm CE flag bit identifies with the second identifier, and described receiving terminal carries out congestion control; Wherein, the ECN of described packet feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier.

The device of 34. 1 kinds of multipath TCP congestion controls, is characterized in that, comprising:

Transmitter, at least one Multipath Transmission control protocol TCP subflow of having set up at the first Access Network for transmitting terminal sends packet to receiving terminal; The transmission ECT flag bit of the support ecn (explicit congestion notification) ECN of described packet identifies with the first identifier, and congestion alarm CE flag bit identifies with the 7th identifier; ECN feedback ECE flag bit identifies with the 3rd identifier; The congestion window CWR flag bit that reduces by half identifies with the 4th identifier; So that the network node of the first Access Network is about to when congested network being detected, by changing CE flag bit, notify described receiving terminal, so that described receiving terminal carries out congestion control;

Processor, in the situation that receiving terminal carries out congestion control, carries out corresponding congestion control.

The system of 35. 1 kinds of multipath TCP congestion controls, is characterized in that, comprising: transmitting terminal, network node, receiving terminal;

Described transmitting terminal is the device of a kind of multipath TCP congestion control described in claim 17-24 any one;

Described receiving terminal is the device of a kind of multipath TCP congestion control described in claim 25-32 any one.

The system of 36. 1 kinds of multipath TCP congestion controls, is characterized in that, comprising: transmitting terminal, network node, receiving terminal;

Described transmitting terminal is the device of a kind of multipath TCP congestion control described in claim 33;

Described receiving terminal is the device of a kind of multipath TCP congestion control described in claim 34.