CN104243090B - A kind of transmission rate method of adjustment and equipment fed back based on wireless channel - Google Patents

Abstract

The invention discloses a transmission rate adjustment method and equipment based on wireless channel feedback, the method comprising: a TCP connection proxy entity acquires wireless channel state information; the TCP connection proxy entity adjusts the timeout retransmission time parameter RTO according to the wireless channel state information, reducing The data sending rate of this TCP connection proxy entity, and notify the device sending data to this TCP connection proxy entity to reduce the data sending rate. In the embodiment of the present invention, the TCP connection proxy entity can reasonably adjust the transmission rate based on the wireless channel state information, and timely and efficiently use channel resources after modulation mode switching, thereby avoiding waste of air interface resources. Further, it can avoid the blind search jitter of TCP congestion control caused by wireless channel instability, and avoid phenomena such as timeout retransmission and queue congestion, thereby improving user experience of wireless data services.

Description

A method and device for adjusting transmission rate based on wireless channel feedback

technical field

The present invention relates to the field of communication technology, in particular to a method and device for adjusting transmission rate based on wireless channel feedback.

Background technique

TCP (Transmission Control Protocol, Transmission Control Protocol) provides a connection-oriented and reliable byte stream to the application layer through mechanisms such as data segmentation, sending number, receiving confirmation, timeout retransmission, out-of-order reassembly, discarding duplicate packets, and flow control. service, and use confirmation and timeout retransmission mechanisms to ensure reliable data transmission. Furthermore, when there are too many packets in the network, the network will be congested, and the congestion control of TCP mainly depends on the congestion window (cwnd), and the receiving window (rwnd) announced by the other end is used for flow control. Among them, the size of the window value represents the largest data segment that can be sent but has not received ACK (definitely determined). Obviously, the larger the window, the faster the data sending rate, but the more likely it is to cause network congestion . Therefore, TCP's congestion control algorithm is to make a trade-off between the two, so that the network throughput can be maximized without congestion.

At present, the wireless channel modulation and coding scheme is independently responsible for the base station equipment, and the two sides of the TCP data communication (transport layer and network layer) are unaware of changes in the channel mode of the physical layer and possible changes in actual data transmission throughput. Among them, from the perspective of the physical layer, when the base station equipment switches the transmission mode, the data transmission rate changes significantly, and the more modulation and coding methods supported by the wireless network, the greater the difference. From the perspective of the transport layer, RTT (Round Trip Time, two-way round-trip time) and the transmission rate change, and there is a mismatch between the sending behavior and the channel characteristics, and because TCP relies on ACK to detect packet loss or delay, the sending behavior adjustment of the transport layer and the channel There is a time difference between adjustments, which can easily cause congestion and performance loss.

When switching from low rate to high rate mode, the channel utilization rate is low due to the TCP connection conservatively probing the upper limit of channel transmission in the congestion avoidance stage; when switching from high rate to low rate mode, the TCP connection sending window is not adjusted in time. Congestion, accompanied by retransmissions of a large number of lost packets.

To sum up, in the existing technology, on the one hand, it may cause false triggering of network congestion, causing unnecessary frequent jitter in the actual sending rate; Shock, resulting in a great waste of the originally rare air interface resources.

Contents of the invention

Embodiments of the present invention provide a transmission rate adjustment method and device based on wireless channel feedback, so as to reasonably adjust the transmission rate and avoid waste of air interface resources.

In order to achieve the above purpose, an embodiment of the present invention provides a transmission rate adjustment method based on wireless channel feedback, including:

The transmission control protocol TCP connection agent entity obtains the wireless channel state information;

The TCP connection proxy entity adjusts the overtime retransmission time parameter RTO according to the wireless channel state information, reduces the data transmission rate of the TCP connection proxy entity, and notifies the device sending data to the TCP connection proxy entity to reduce the data transmission rate.

The embodiment of the present invention provides a transmission control protocol TCP connection proxy entity, including:

An acquisition module, configured to acquire wireless channel state information;

The processing module is used to adjust the overtime retransmission time parameter RTO according to the wireless channel state information, reduce the data transmission rate of the TCP connection proxy entity, and notify the device sending data to the TCP connection proxy entity to reduce the data transmission rate.

Compared with the prior art, the embodiment of the present invention has at least the following advantages: In the embodiment of the present invention, the TCP connection proxy entity can reasonably adjust the transmission rate based on the wireless channel state information, and use the channel resources after the modulation mode switching in a timely and efficient manner. , so that the waste of air interface resources can be avoided. Furthermore, it can avoid the blind search jitter of TCP congestion control caused by wireless channel instability, and avoid phenomena such as overtime retransmission and queue congestion, thereby improving user experience of wireless data services.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a method for adjusting a transmission rate based on wireless channel feedback provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of a TCP connection proxy entity provided by Embodiment 2 of the present invention.

detailed description

The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one

Aiming at the problems existing in the prior art, Embodiment 1 of the present invention provides a transmission rate adjustment method based on wireless channel feedback. FIG. 1 is a schematic diagram of an application scenario of the embodiment of the present invention. Mobile terminals), base station equipment, TCP connection proxy entities, gateway equipment (such as packet domain gateways) and servers in the network. Wherein, the TCP connection proxy entity may be integrated on the current base station device or the gateway device. In FIG. 1 , the integration of the TCP connection proxy entity on the gateway device is taken as an example for illustration. In addition, the terminal device corresponds to a browser that needs to access the server, and the server is a corresponding service site, and corresponds to WEB (Internet).

In the above application scenario, as shown in Figure 2, the method may include the following steps:

In step 201, the TCP connection proxy entity acquires wireless channel state information.

In the embodiment of the present invention, the TCP connection agent entity acquires the wireless channel state information, specifically including but not limited to the following manner: the TCP connection agent entity receives the wireless channel state information reported by the base station device. Wherein, the wireless channel state information reported by the base station device may specifically be the air interface resource scheduling result and the modulation and coding mode; or, the wireless channel state information reported by the base station device may specifically be the data transmission bit rate determined based on the air interface resource scheduling result and the modulation and coding mode or, the wireless channel state information reported by the base station device may specifically be cell congestion indication information; or, the wireless channel state information reported by the base station device may specifically be channel bearer information.

Wherein, the data transmission bit rate is the normalized channel rate; the cell congestion indication information includes but not limited to congestion or not, congestion level and other information; the channel bearer information includes but not limited to whether the radio bearer is activated, carrier symbol rate, modulation Coding mode or order, normalized channel rate and other information.

Step 202, the TCP connection proxy entity adjusts the timeout retransmission time parameter RTO (Retransmission Time Out , overtime retransmission time, such as increasing the RTO of RT (Retransmission Timer, retransmission timer), reducing the data transmission rate of the TCP connection proxy entity (such as reducing the data transmission rate of the TCP connection proxy entity sending data to the base station equipment), And notify the device sending data to the TCP connection proxy entity to reduce the data transmission rate (for example, notify the server to reduce the data transmission rate for sending data to the TCP connection proxy entity).

In the embodiment of the present invention, the TCP connection proxy entity adjusts the overtime retransmission time parameter RTO according to the wireless channel state information, reduces the data transmission rate of the TCP connection proxy entity, and notifies the device sending data to the TCP connection proxy entity to reduce the data transmission rate The process specifically includes but is not limited to the following methods: when the TCP connection proxy entity determines that the effective data transmission bit rate of the air interface changes (such as: a significant change) according to the wireless channel state information, the TCP connection proxy entity needs to increase the RT (the RT is The RTO of the RT that has delivered/to be delivered downlink data to reduce the probability of timeout retransmission; in addition, the TCP connection proxy entity also needs to reduce the data transmission rate of the TCP connection proxy entity to avoid causing the downlink queue of the base station equipment Congestion; In addition, the TCP connection proxy entity also needs to notify the device (server) that sends data to the TCP connection proxy entity to reduce the data transmission rate, so as to avoid the data retransmission and window of the link between the server and the server due to local buffer congestion. search.

In the specific implementation of the embodiment of the present invention, when the wireless channel state information is the air interface resource scheduling result and the modulation and coding mode, the TCP connection proxy entity can first determine the data transmission bit rate based on the air interface resource scheduling result and the modulation and coding mode, and then based on The data transmission bit rate determines whether the effective data transmission bit rate of the air interface changes; when the wireless channel state information is the data transmission bit rate determined based on the air interface resource scheduling result and the modulation and coding mode, the TCP connection proxy entity can directly determine based on the data transmission bit rate Whether the effective data transmission bit rate of the air interface changes.

In a preferred implementation of the embodiment of the present invention, the TCP connection proxy entity determines that the effective data transmission bit rate of the air interface changes according to the wireless channel state information, specifically including but not limited to the following methods: When the channel state information determines that the corresponding data transmission bit rate is greater than the preset first threshold, and the corresponding data transmission bit rate is determined to be less than the preset second threshold according to the wireless channel state information received this time, determine the effective data transmission bit rate of the air interface A change occurs (eg, a significant change) and the data transmission bit rate switches from a high data rate to a low data rate at this time.

Wherein, both the preset first threshold and the preset second threshold can be set arbitrarily according to actual experience values, and the preset first threshold needs to be greater than the preset second threshold.

In the specific implementation of the embodiment of the present invention, when the wireless channel state information is the cell congestion indication information, the TCP connection proxy entity can be based on the cell congestion indication information (such as congestion or not, congestion level) and the configurable conversion rule table ( It can be set according to the actual experience value, which is used to identify the data transmission bit rate of the congestion indication information of different cells) to determine whether the effective data transmission bit rate of the air interface changes; when the wireless channel state information is the channel bearer information, the TCP connection proxy entity can First determine the data transmission bit rate based on the channel bearer information (such as carrier symbol rate, modulation and coding mode or order), and then determine whether the effective data transmission bit rate of the air interface changes based on the data transmission bit rate; or, when the wireless channel state information is the channel When carrying information, the TCP connection proxy entity can directly determine whether the effective data transmission bit rate of the air interface changes based on the channel carrying information (such as whether the wireless bearer is activated, which is equivalent to a switch).

Currently, RTO is calculated based on RTT mean and variance measurement, including its initial setting, dynamic algorithm, upper and lower limit thresholds, etc.; the setting and use of RT are as follows: TCP data sender sets according to the currently calculated RTO for each sent data message RT; if all sent data is confirmed, turn off RT; otherwise, if new data confirmation is received, reset RT according to RTO; when RT is found to be timed out, retransmit the earliest unconfirmed sent message, and set RTO to double, repeat the process process until the packet is successfully retransmitted.

In order to avoid retransmission of TCP downlink data overtime during the wireless channel state switching process, in the embodiment of the present invention, the TCP connection agent entity obtains the wireless channel state information reported by the base station equipment (which is encapsulated by the tunneling protocol GTP-U or IP protocol), and utilizes The wireless channel state information (which is the wireless channel state information corresponding to the TCP data flow monitored by the base station equipment) resets the RTO. Specifically, the TCP connection proxy entity uses the wireless channel state information to determine that when the effective data transmission rate of the air interface changes significantly (especially switching from a high data rate to a low data rate), it adjusts the sent but not yet confirmed downlink TCP data packets as needed RTO of RT, and intervene in the subsequent dynamic calculation process of RTT.

In the embodiment of the present invention, the process of increasing the RTO of the RT by the TCP connection proxy entity (that is, the process of adjusting the timeout retransmission time parameter RTO) specifically includes but is not limited to the following methods:

Step 1. When the TCP connection proxy entity receives the wireless channel state information (such as the switching information of the modulation and coding mode reported by the base station equipment), it records the first RTO at the current moment (that is, the parameter RTO estimated by the current RTT) and the current RTO at the current moment. Sequence number x of downlink TCP data sent but not yet acknowledged.

Step 2. If the RT has been started at this time, the TCP connection proxy entity resets the second RTO to be: first RTO*(max{1, m/m ₁ }); where m/m ₁ is the effective bit rate of the channel ( That is, the ratio of the normalized data rate); further, when the order of channel coding changes, m/m1=log ₂ (s/s ₁ ), and s/s ₁ is the ratio of each carrier symbol in different modulation and coding modes ratio of steps.

Step 3. The TCP connection proxy entity determines that after receiving the wireless channel state information and before receiving the ACK covering x, adjust the timeout retransmission time parameter RTO (the third RTO) to the second RTO.

Step 4: After receiving the ACK covering x, the TCP connection proxy entity resumes the RTT dynamic evaluation calculation process with the increased RTO (the third RTO) as the initial value.

The idea of current TCP congestion control is to continuously adjust the size of the sending window, and to use end-to-end transmission feedback (packet loss, delay, etc.) . On the one hand, there are insurmountable errors in the detection of congestion. The medium of the wireless channel determines that the link is extremely susceptible to interference, resulting in temporary packet loss and delay jitter. Therefore, it is difficult to ensure the accuracy of the rate adjustment timing, resulting in a decrease in efficiency. On the other hand, there is blindness in rate matching. Due to the lack of prior knowledge of the channel transmission performance after the state change, the TCP sender can only adjust the transmission rate based on experience to ensure that congestion is relieved as soon as possible at the expense of transmission efficiency.

In order to solve the above problems, for the scenario where the terminal device accesses the packet domain through the cellular network, and for the scenario of wireless channel state switching, in the embodiment of the present invention, by deploying the TCP connection proxy entity at the packet domain gateway, the end-to-end time for channel state switching can be shortened. Feedback and response delay (that is, shorten RTT), improve the timeliness of data transmission adjustment response; further, the TCP connection proxy entity obtains the wireless channel status information reported by the base station equipment (which is encapsulated through the tunneling protocol GTP-U or IP protocol), And use the wireless channel state information (which is the wireless channel state information corresponding to the TCP data flow monitored by the base station equipment) to reduce the data transmission rate of the TCP connection proxy entity, and notify the device sending data to the TCP connection proxy entity to reduce the data transmission rate , so as to avoid congestion and improve efficiency.

In the embodiment of the present invention, the TCP connection proxy entity reduces the data transmission rate of the TCP connection proxy entity, and notifies the device (such as a server) that sends data to the TCP connection proxy entity to reduce the data transmission rate process, specifically including but not limited to the following Way:

Method 1. Reuse the downlink buffer and rate matching of the window method; this method includes the following steps:

Step 1. When the TCP connection proxy entity receives the wireless channel state information (such as the switching information of the modulation and coding mode reported by the base station equipment), it records the current moment of the terminal equipment connection downlink congestion window value cwnd, and the current moment of the terminal equipment receiving window Value rwnd.

Step 2. The TCP connection proxy entity resets the sending window swnd to: min{cwnd ₁ , rwnd}.

Among them, cwnd ₁ = max{iwnd, cwnd*(m/m ₁ )}, the iwnd is the initial sending window of this TCP connection proxy entity; in addition, m/m ₁ is the effective bit rate of the channel (that is, the normalized data rate ) ratio; further, when the channel coding order changes, m/m1=log ₂ (s/s ₁ ), and s/s ₁ is the ratio of the order of each carrier symbol in different modulation and coding modes.

In the embodiment of the present invention, it is also possible to extend the timeout only when the channel transmission rate drops, and when the channel transmission rate increases due to modulation mode switching, it still relies on TCP's own detection mechanism to increase conservatively, for example: cwnd ₁ =cwnd* (min{1, (m/m1)}).

Step 3. The TCP connection proxy entity caches the downlink data from the device (server) that sends data to the TCP connection proxy entity, modifies the receiving window value in the uplink ACK to rwnd', and notifies the device that sends data to the TCP connection proxy entity Reduce the data sending rate, and the device that sends data to the TCP connection proxy entity adjusts the data sending rate to: min{C _buff , rwnd'*(m/m ₁ )}; where, C _buff is the single connection of the TCP connection proxy entity Data cache upper limit threshold.

Method 2. The downlink buffer and rate matching in the superimposed window method; this method includes the following steps:

Step 1. When the TCP connection proxy entity receives the wireless channel state information (such as the switching information of the modulation and coding mode reported by the base station equipment), it records the current moment of the terminal equipment connection downlink congestion window value cwnd, and the current moment of the terminal equipment receiving window Value rwnd.

Step 2. The TCP connection proxy entity resets the bandwidth window wwnd' to: wwnd*(m/m ₁ ), and resets the sending window swnd to: min{cwnd, rwnd, wwnd'}.

Wherein, wwnd is the channel window parameter; Specifically, by modifying the TCP protocol stack congestion control logic on the side of the TCP connection proxy entity, a channel window parameter wwnd is added to reflect the window size of the bottleneck link in real time; in a steady state, the wwnd value = swnd window size.

Among them, m/m ₁ is the ratio of channel effective bit rate (i.e. normalized data rate); further, when the order of channel coding changes, m/m1=log ₂ (s/s ₁ ), and s/ s ₁ is the ratio of the order of each carrier symbol in different modulation and coding modes.

Step 3. The TCP connection proxy entity caches the downlink data from the device (server) that sends data to the TCP connection proxy entity, modifies the receiving window value in the uplink ACK to rwnd', and notifies the device that sends data to the TCP connection proxy entity Reduce the data sending rate, and the device that sends data to the TCP connection proxy entity adjusts the data sending rate to: min{C _buff , rwnd'*(swnd/swnd')}; where, C _buff is the single connection of the TCP connection proxy entity Data cache upper limit threshold, swnd is the reset send window, swnd' is the send window before reset.

To sum up, in the embodiment of the present invention, the TCP connection proxy entity can reasonably adjust the transmission rate based on the wireless channel state information, and use the channel resources after modulation mode switching in a timely and efficient manner, thereby avoiding the waste of air interface resources. Furthermore, it can avoid the blind search jitter of TCP congestion control caused by wireless channel instability, and avoid overtime retransmission (such as avoiding the timeout retransmission of base station equipment buffering data packets and subsequent data packets to be delivered after channel state switching) and queue congestion and other phenomena, thereby improving the user experience of wireless data services. Furthermore, by deploying the TCP connection proxy entity on the packet domain gateway, it is possible to shorten the end-to-end feedback and response delay (that is, shorten the RTT) when the channel state is switched, and improve the timeliness of data transmission adjustment response.

Embodiment two

Based on the same inventive concept as the above method, an embodiment of the present invention also provides a transmission control protocol TCP connection proxy entity, as shown in Figure 3, the TCP connection proxy entity includes:

An acquisition module 11, configured to acquire wireless channel state information;

The processing module 12 is used to adjust the overtime retransmission time parameter RTO according to the wireless channel state information, reduce the data transmission rate of the TCP connection proxy entity, and notify the device sending data to the TCP connection proxy entity to reduce the data transmission rate.

In the embodiment of the present invention, the wireless channel state information is specifically the air interface resource scheduling result and the modulation and coding mode; or, the wireless channel state information is specifically the data transmission bit rate determined based on the air interface resource scheduling result and the modulation and coding mode; or , the wireless channel state information is specifically cell congestion indication information; or, the wireless channel state information is specifically channel bearer information;

The acquisition module 11 is specifically configured to receive the wireless channel state information reported by the base station equipment.

In the embodiment of the present invention, the wireless channel state information is specifically the air interface resource scheduling result and the modulation and coding mode; or, the wireless channel state information is specifically the data transmission bit rate determined based on the air interface resource scheduling result and the modulation and coding mode; or , the wireless channel state information is specifically cell congestion indication information; or, the wireless channel state information is specifically channel bearer information;

The processing module 12 is specifically used to adjust the overtime retransmission time parameter RTO when determining that the effective data transmission bit rate of the air interface changes according to the wireless channel state information, reduce the data transmission rate of the TCP connection proxy entity, and notify the The device that sends data to the proxy entity of the TCP connection reduces the data sending rate.

The processing module 12 is further configured to determine that the corresponding data transmission bit rate is greater than the preset first threshold according to the wireless channel state information received last time, and determine the corresponding data transmission bit rate according to the wireless channel state information received this time. When the rate is less than the preset second threshold, it is determined that the effective data transmission bit rate of the air interface changes; wherein, the preset first threshold is greater than the preset second threshold.

The processing module 12 is specifically configured to, when receiving the wireless channel state information, record the first RTO at the current moment and the serial number x of the downlink TCP data that has been sent but not yet confirmed at the current moment;

Resetting the second RTO as: the first RTO*(max{1, m/m ₁ }); wherein, the m/m ₁ is the ratio of the channel effective bit rate;

It is determined that after receiving the wireless channel state information and before receiving the positive acknowledgment ACK covering the x, adjust the timeout retransmission time parameter RTO to the second RTO.

The processing module 12 is specifically configured to record the terminal device connection downlink congestion window value cwnd and the terminal device receiving window value rwnd at the current moment when receiving the wireless channel state information;

Reset the sending window swnd to: min{cwnd ₁ , rwnd}; where, cwnd ₁ = max{iwnd, cwnd*(m/m ₁ )}, the iwnd is the initial sending window of the TCP connection proxy entity, the m/m ₁ is the ratio of channel effective bit rate;

Cache the downlink data from the device sending data to the proxy entity of this TCP connection, modify the value of the receiving window in the uplink ACK to rwnd', and notify the device sending data to the proxy entity of the TCP connection to reduce the data transmission rate, and the TCP connection The device that the proxy entity sends data adjusts the data transmission rate to: min{C _buff , rwnd'*(m/m ₁ )}; wherein, the C _buff is the upper limit threshold of the single connection data cache of the TCP connection proxy entity.

The processing module 12 is specifically configured to record the terminal device connection downlink congestion window value cwnd and the terminal device receiving window value rwnd at the current moment when receiving the wireless channel state information;

Reset the bandwidth window wwnd' to: wwnd*(m/m ₁ ), and reset the sending window swnd to: min{cwnd, rwnd, wwnd'}; wherein, the wwnd is the channel window parameter, and the m/m ₁ is the ratio of channel effective bit rate;

Cache the downlink data from the device sending data to the proxy entity of this TCP connection, modify the value of the receiving window in the uplink ACK to rwnd', and notify the device sending data to the proxy entity of the TCP connection to reduce the data transmission rate, and the TCP connection The device that the proxy entity sends data adjusts the data transmission rate to: min{C _buff , rwnd'*(swnd/swnd')}; wherein, the C _buff is the upper limit threshold of the single connection data cache of the TCP connection proxy entity, and the swnd is the reset sending window, and the swnd' is the sending window before reset.

Wherein, each module of the device of the present invention can be integrated into one body, or can be deployed separately. The above modules can be combined into one module, or can be further split into multiple sub-modules.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A computer device (which may be a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, or can be located in one or more devices different from the embodiment according to corresponding changes. The modules in the above embodiments can be combined into one module, and can also be further divided into multiple sub-modules.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (14)

1. a kind of transmission rate method of adjustment fed back based on wireless channel, it is characterised in that including：

Transmission control protocol TCP connection agent entity obtains radio channel status information；

The TCP connection agent entitys adjust Retransmission timeout time parameter RTO according to the radio channel status information, and reduction is originally The data transmission rate of TCP connection agent entitys, and notify to reduce data to the equipment that this TCP connections agent entity sends data Transmission rate；

Wherein, the process of the TCP connections agent entity adjustment Retransmission timeout time parameter RTO is specifically included：

The TCP connection agent entitys when receiving the radio channel status information, record current time the first RTO and The transmission at current time but still unacknowledged descending TCP data sequence number x；

The TCP connections agent entity is determined after the radio channel status information is received, and is receiving the covering x's Before positive acknowledgment ACK, adjustment Retransmission timeout time parameter RTO is the 2nd RTO.

2. the method as described in claim 1, it is characterised in that the radio channel status information is specially interface-free resources scheduling And modulating-coding pattern as a result；Or, the radio channel status information be specially based on interface-free resources scheduling result and The data transfer bit rate that modulating-coding pattern is determined；Or, the radio channel status information is specially that small area jam is indicated Information；Or, the radio channel status information is specially channel bearing information；

The transmission control protocol TCP connection agent entity obtains radio channel status information, specifically includes：

The TCP connections agent entity receives the radio channel status information that base station equipment is reported.

3. the method as described in claim 1, it is characterised in that the radio channel status information is specially interface-free resources scheduling And modulating-coding pattern as a result；Or, the radio channel status information be specially based on interface-free resources scheduling result and The data transfer bit rate that modulating-coding pattern is determined；Or, the radio channel status information is specially that small area jam is indicated Information；Or, the radio channel status information is specially channel bearing information；

The TCP connection agent entitys adjust Retransmission timeout time parameter RTO according to the radio channel status information, and reduction is originally The data transmission rate of TCP connection agent entitys, and notify to reduce data to the equipment that this TCP connections agent entity sends data Transmission rate, is specifically included：

The TCP connection agent entitys are determining valid data transmission bit rate hair of eating dishes without rice or wine according to the radio channel status information During changing, adjust Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP connection agent entitys, and notify to This TCP connections agent entity sends the equipment reduction data transmission rate of data.

4. method as claimed in claim 3, it is characterised in that the TCP connection agent entitys are according to the wireless channel shape State information determines that valid data transmission bit rate of eating dishes without rice or wine changes, and specifically includes：

The radio channel status information that the TCP connection agent entitys are received according to the last time determines corresponding data transfer bit Rate is more than preset first threshold value, and the radio channel status information received according to this determines that corresponding data transfer bit rate is small When default Second Threshold, it is determined that valid data transmission bit rate of eating dishes without rice or wine changes；Wherein, the preset first threshold value is more than The default Second Threshold.

5. the method as described in claim 1 or 3, it is characterised in that the TCP connections agent entity adjusts the Retransmission timeout time Parameter RTO process, the TCP connections agent entity resets the 2nd RTO and is：

First RTO* (the max { 1, m/m₁})；Wherein, the m/m₁For the ratio between channel valid bit speed.

6. the method as described in claim 1 or 3, it is characterised in that the TCP connections agent entity reduces this TCP connection generations The data transmission rate of entity is managed, and notifies to reduce data transmission rate to the equipment that this TCP connections agent entity sends data Process, further comprise：

The TCP connection agent entitys are when receiving the radio channel status information, and the terminal device at record current time connects Meet downlink congestion window value cwnd and terminal device receives window value rwnd；

The TCP connections agent entity resets transmission window swnd：min{cwnd₁, rwnd }；

Wherein, cwnd₁=max { iwnd, cwnd* (m/m₁), the iwnd is the initial transmission window of this TCP connection agent entitys Mouthful, the m/m₁For the ratio between channel valid bit speed；

The downlink data of the TCP connections agent entity caching from the equipment that data are sent to this TCP connections agent entity, will Window value is received in uplink ACK and is revised as rwnd ', and notifies to send the equipment reduction of data to this TCP connections agent entity Data transmission rate, be from the equipment adjustment data transmission rate for sending data to TCP connections agent entity：min{C_buff, rwnd’*(m/m₁)}；Wherein, the C_buffFor the single connection data buffer storage upper limit threshold of the TCP connections agent entity.

7. the method as described in claim 1 or 3, it is characterised in that the TCP connections agent entity reduces this TCP connection generations The data transmission rate of entity is managed, and notifies to reduce data transmission rate to the equipment that this TCP connections agent entity sends data Process, further comprise：

The TCP connection agent entitys are when receiving the radio channel status information, and the terminal device at record current time connects Meet downlink congestion window value cwnd and terminal device receives window value rwnd；

The TCP connections agent entity resets bandwidth window wwnd '：wwnd*(m/m₁), and reset transmission window Swnd is：Min cwnd, rwnd, wwnd ' }；

Wherein, the wwnd is channel window parameter, the m/m₁For the ratio between channel valid bit speed；

The downlink data of the TCP connections agent entity caching from the equipment that data are sent to this TCP connections agent entity, will Window value is received in uplink ACK and is revised as rwnd ', and notifies to send the equipment reduction of data to this TCP connections agent entity Data transmission rate, be from the equipment adjustment data transmission rate for sending data to TCP connections agent entity：min{C_buff, rwnd’*(swnd/swnd’)}；Wherein, the C_buffFor the single connection data buffer storage upper limit threshold of the TCP connections agent entity Value, the swnd attaches most importance to newly-installed transmission window, and the swnd ' is the transmission window before resetting.

8. a kind of transmission control protocol TCP connects agent entity, it is characterised in that including：

Acquisition module, for obtaining radio channel status information；

Processing module, for adjusting Retransmission timeout time parameter RTO according to the radio channel status information, reduces this TCP companies The data transmission rate of agent entity is connect, and notifies to send to the equipment reduction data that this TCP connections agent entity sends data Speed；

Wherein, during the TCP connections agent entity adjustment Retransmission timeout time parameter RTO, the processing module is specific The first RTO and the transmission at current time for when receiving the radio channel status information, recording current time But still unacknowledged descending TCP data sequence number x；

It is determined that after the radio channel status information is received, and before the positive acknowledgment ACK for covering the x is received, adjust Whole Retransmission timeout time parameter RTO is the 2nd RTO.

9. TCP connections agent entity as claimed in claim 8, it is characterised in that

The radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern；Or, it is described wireless Channel condition information is specially the data transfer bit rate determined based on interface-free resources scheduling result and modulating-coding pattern；Or Person, the radio channel status information is specially small area jam configured information；Or, the radio channel status information is specially Channel bearing information；

The acquisition module, specifically for receiving the radio channel status information that base station equipment is reported.

10. TCP connections agent entity as claimed in claim 8, it is characterised in that

The radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern；Or, it is described wireless Channel condition information is specially the data transfer bit rate determined based on interface-free resources scheduling result and modulating-coding pattern；Or Person, the radio channel status information is specially small area jam configured information；Or, the radio channel status information is specially Channel bearing information；

The processing module, specifically for determining valid data transmission bit rate of eating dishes without rice or wine according to the radio channel status information When changing, adjust Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP connection agent entitys, notify to This TCP connections agent entity sends the equipment reduction data transmission rate of data.

11. TCP connections agent entity as claimed in claim 10, it is characterised in that

The processing module, is further used for determining corresponding data transfer according to the radio channel status information that the last time receives Bit rate is more than preset first threshold value, and the radio channel status information received according to this determines corresponding data transfer bit When rate is less than default Second Threshold, it is determined that valid data transmission bit rate of eating dishes without rice or wine changes；Wherein, the preset first threshold value More than the default Second Threshold.

12. the TCP connection agent entitys as described in claim 8 or 10, it is characterised in that

Resetting the 2nd RTO is：First RTO* (the max { 1, m/m₁})；Wherein, the m/m₁For channel valid bit speed The ratio between rate.

13. the TCP connection agent entitys as described in claim 8 or 10, it is characterised in that

The processing module, specifically for when receiving the radio channel status information, recording the terminal device at current time Connect downlink congestion window value cwnd and terminal device receives window value rwnd；

Resetting transmission window swnd is：min{cwnd₁, rwnd }；Wherein, cwnd₁=max { iwnd, cwnd* (m/m₁), The iwnd is the initial transmission window of this TCP connection agent entitys, the m/m₁For the ratio between channel valid bit speed；

The downlink data from the equipment that data are sent to this TCP connections agent entity is cached, window number will be received in uplink ACK Value is revised as rwnd ', and notifies to reduce data transmission rate to the equipment that this TCP connections agent entity sends data, from this to The equipment of TCP connections agent entity transmission data adjusts data transmission rate and is：min{C_buff, rwnd ' * (m/m₁)}；Wherein, institute State C_buffFor the single connection data buffer storage upper limit threshold of this TCP connection agent entitys.

14. the TCP connection agent entitys as described in claim 8 or 10, it is characterised in that

The processing module, specifically for when receiving the radio channel status information, recording the terminal device at current time Connect downlink congestion window value cwnd and terminal device receives window value rwnd；

Resetting bandwidth window wwnd ' is：wwnd*(m/m₁), and reset transmission window swnd be：Min cwnd, Rwnd, wwnd ' }；Wherein, the wwnd is channel window parameter, the m/m₁For the ratio between channel valid bit speed；

The downlink data from the equipment that data are sent to this TCP connections agent entity is cached, window number will be received in uplink ACK Value is revised as rwnd ', and notifies to reduce data transmission rate to the equipment that this TCP connections agent entity sends data, from this to The equipment of TCP connections agent entity transmission data adjusts data transmission rate and is：min{C_buff, rwnd ' * (swnd/swnd ') }； Wherein, the C_buffFor the single connection data buffer storage upper limit threshold of this TCP connection agent entitys, the swnd attaches most importance to newly-installed Window is sent, the swnd ' is the transmission window before resetting.