CN104243090A - Sending rate adjustment method and device based on wireless channel feedback - Google Patents
Sending rate adjustment method and device based on wireless channel feedback Download PDFInfo
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- CN104243090A CN104243090A CN201310244644.0A CN201310244644A CN104243090A CN 104243090 A CN104243090 A CN 104243090A CN 201310244644 A CN201310244644 A CN 201310244644A CN 104243090 A CN104243090 A CN 104243090A
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Abstract
The invention discloses a sending rate adjustment method and device based on wireless channel feedback. The sending rate adjustment method comprises the steps that a TCP connection agent entity acquires wireless channel state information; the TCP connection agent entity adjusts retransmission time out (RTO) parameters according to the wireless channel state information, the data sending rate of the TCP connection agent entity is reduced, and a device sending data to the TCP connection agent entity is notified to reduce the data sending rate. According to the sending rate adjustment method and device based on wireless channel feedback, the TCP connection agent entity can reasonably adjust the sending rate according to the wireless channel state information, channel resources obtained after modulation modes are switched can be efficiently utilized in time, and waste of radio resources can be avoided. Furthermore, blind search jitter of TCP congestion control caused by unstable wireless channels can be avoided, RTO, queue congestion and the like are avoided, and therefore wireless data service user experience is improved.
Description
Technical field
The present invention relates to communication technical field, especially relate to a kind of transmission rate method of adjustment based on wireless channel feedback and equipment.
Background technology
TCP(Transmission Control Protocol, transmission control protocol) provide connection-oriented, reliable byte stream service by data sectional, transmission numbering, confirmation of receipt, Retransmission timeout, out of order restructuring, the mechanism such as duplicate packages, flow control that abandons to application layer, and use the reliability transmission of confirmation and Retransmission timeout mechanism guarantee data.Further, when there is too much message in network, network can be caused to occur congested, and the congestion control of TCP depends on congestion window (cwnd), the receive window (rwnd) that another opposite end is noticed is for flow control.Wherein, the representative of the size of window value can send, but does not also receive ACK(and certainly determine) maximum data message segment, obviously, window is larger, then data transmission rate is faster, but also more may cause network congestion.Therefore, the congestion avoidance algorithm of TCP will be weighed exactly between both, makes network throughput maximize and not produce congested.
Current wireless channel Modulation and Coding Scheme by base station equipment be independently responsible for, tcp data communicating pair (transport layer and network layer) for physical layer channel pattern change and may bring actual data transfer throughput change and ignorant.Wherein, from physical layer, when base station equipment switches transmission mode, message transmission rate generation marked change, and wireless network supports that modulation coding mode is more, difference is larger.From transport layer, RTT(Round Trip Time, two-way two-way time) change with transmission rate, there is mismatch in transmission behavior and the characteristic of channel, and detect packet loss or time delay because TCP depends on ACK, it is poor that transport layer sends behavior adjustment and channel adjustment life period, thus easily cause congested with performance loss.
When being switched to high-rate mode from low rate, cause channel utilization low because TCP is connected to the congestion avoidance phase conservative exploration transmission upper limit; When being switched to low rate mode from two-forty, cause congested not in time because TCP connects send window adjustment, and along with the re-transmission of a large amount of lost data packets.
In sum, in prior art, may cause the false triggering of network congestion on the one hand, there is unnecessary frequent shake in actual transmission rate; The one-side blindness of send window is shunk on the other hand, causes actual transmission rate that unnecessary oscillation on large scale occurs, and causes the significant wastage of originally rare interface-free resources.
Summary of the invention
The embodiment of the present invention provides a kind of transmission rate method of adjustment based on wireless channel feedback and equipment, reasonably to adjust transmission rate, and can avoid the waste of interface-free resources.
In order to achieve the above object, the embodiment of the present invention provides a kind of transmission rate method of adjustment based on wireless channel feedback, comprising:
Transmission control protocol TCP Connection Proxy entity obtains radio channel status information;
Described TCP Connection Proxy entity is according to described radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate.
The embodiment of the present invention provides a kind of transmission control protocol TCP Connection Proxy entity, comprising:
Acquisition module, for obtaining radio channel status information;
Processing module, for according to described radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate.
Compared with prior art, the embodiment of the present invention at least has the following advantages: in the embodiment of the present invention, TCP Connection Proxy entity reasonably can adjust transmission rate based on radio channel status information, and the channel resource after utilizing modulating mode to switch in time efficiently, thus the waste of interface-free resources can be avoided.Further, the blind search shake of the TCP congestion control that wireless channel instability can be avoided to cause, avoids the phenomenon such as Retransmission timeout and queue congestion, thus improves wireless data service Consumer's Experience.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the application scenarios schematic diagram of the embodiment of the present invention;
Fig. 2 is a kind of transmission rate method of adjustment schematic flow sheet based on wireless channel feedback that the embodiment of the present invention one provides;
Fig. 3 is the structural representation of a kind of TCP Connection Proxy entity that the embodiment of the present invention two provides.
Embodiment
Below in conjunction with the accompanying drawing in the present invention, be clearly and completely described the technical scheme in the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
For problems of the prior art, the embodiment of the present invention one provides a kind of transmission rate method of adjustment based on wireless channel feedback, take Fig. 1 as the application scenarios schematic diagram of the embodiment of the present invention, the method can be applied in the network comprising terminal equipment (as mobile terminal), base station equipment, TCP Connection Proxy entity, gateway device (as packet domain gateway) and server.Wherein, this TCP Connection Proxy entity can be integrated on current base station equipment or gateway device, is integrated on gateway device is in FIG described for TCP Connection Proxy entity.In addition, to there being the browser needing to access this server on this terminal equipment, this server is corresponding services sites, and to there being WEB(the Internet).
Under above-mentioned application scenarios, as shown in Figure 2, the method can comprise the following steps:
Step 201, TCP Connection Proxy entity obtains radio channel status information.
In the embodiment of the present invention, TCP Connection Proxy entity obtains radio channel status information, specifically includes but not limited to as under type: TCP Connection Proxy entity receives the radio channel status information that base station equipment reports.Wherein, the radio channel status information that base station equipment reports is specifically as follows interface-free resources scheduling result and modulating-coding pattern; Or the radio channel status information that base station equipment reports is specifically as follows based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or the radio channel status information that base station equipment reports is specifically as follows small area jam indication information; Or the radio channel status information that base station equipment reports is specifically as follows channel bearing information.
Wherein, this transfer of data bit rate is normalization channel speed; This small area jam indication information includes but not limited to the information such as whether congested, congestion level; This channel bearing information includes but not limited to whether radio bearer activates, symbols speed, modulating-coding pattern or the information such as exponent number, normalization channel speed.
Step 202, TCP Connection Proxy entity is according to radio channel status information (interface-free resources scheduling result and modulating-coding pattern; Or transfer of data bit rate; Or small area jam indication information; Or channel bearing information) adjust Retransmission timeout time parameter RTO(Retransmission Time Out, the Retransmission timeout time, as increased RT(Retransmission Timer, re-transmission timer) RTO), reduce the data transmission rate (as reduced the data transmission rate of TCP Connection Proxy entity to base station equipment transmission data) of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate (as announcement server reduces the data transmission rate to TCP Connection Proxy entity transmission data).
In the embodiment of the present invention, TCP Connection Proxy entity is according to radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and notice sends the process of the equipment reduction data transmission rate of data to this TCP Connection Proxy entity, specifically include but not limited to as under type: TCP Connection Proxy entity is when valid data transmission bit rate of determining according to radio channel status information to eat dishes without rice or wine changes (as: marked change), this TCP Connection Proxy entity needs to increase RT(this RT and issues/the RT of downlink data to be issued) RTO, to reduce Retransmission timeout probability, in addition, this TCP Connection Proxy entity also needs the data transmission rate reducing this TCP Connection Proxy entity, to avoid the down queue causing base station equipment congested, in addition, this TCP Connection Proxy entity also needs to notify that sending the equipment (server) of data to this TCP Connection Proxy entity reduces data transmission rate, to avoid data re-transmitting due to link between locally buffered congested that cause and server and window search.
In the specific implementation of the embodiment of the present invention, when radio channel status information be interface-free resources scheduling result and modulating-coding pattern time, whether TCP Connection Proxy entity can first based on interface-free resources scheduling result and modulating-coding pattern determination transfer of data bit rate, change afterwards based on transfer of data bit rate valid data transmission bit rate of determining to eat dishes without rice or wine; When radio channel status information is based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate, whether TCP Connection Proxy entity can directly change based on transfer of data bit rate valid data transmission bit rate of determining to eat dishes without rice or wine.
In a kind of preferred implementation of the embodiment of the present invention, TCP Connection Proxy entity changes according to radio channel status information valid data transmission bit rate of determining to eat dishes without rice or wine, specifically include but not limited to as under type: according to the radio channel status information that the last time receives, TCP Connection Proxy entity determines that corresponding transfer of data bit rate is greater than preset first threshold value, and when determining that corresponding transfer of data bit rate is less than default Second Threshold according to the radio channel status information that this receives, valid data transmission bit rate of determining to eat dishes without rice or wine changes (as: marked change), and now transfer of data bit rate is switched to low data rate from High Data Rate.
Wherein, this preset first threshold value and default Second Threshold all can be arranged arbitrarily according to practical experience value, and this preset first threshold value needs to be greater than this default Second Threshold.
In the specific implementation of the embodiment of the present invention, when radio channel status information is small area jam indication information, whether TCP Connection Proxy entity can change based on small area jam indication information (as whether congested, congestion level) and configurable transformation rule table (can arrange according to practical experience value, for identifying the transfer of data bit rate situation of the congested indication information in different districts) valid data transmission bit rate of determining to eat dishes without rice or wine; When radio channel status information is channel bearing information, whether TCP Connection Proxy entity first can determine transfer of data bit rate based on channel bearing information (as symbols speed, modulating-coding pattern or exponent number), change afterwards based on transfer of data bit rate valid data transmission bit rate of determining to eat dishes without rice or wine; Or when radio channel status information is channel bearing information, whether TCP Connection Proxy entity can directly change based on channel bearing information (as whether radio bearer activates, being equivalent to switch) valid data transmission bit rate of determining to eat dishes without rice or wine.
Current according to RTT mean and variance survey calculation RTO, comprise its initial setting up, dynamic algorithm, bound threshold value etc.; The setting of RT and use are provided as follows: tcp data transmitting terminal is that each RTO sent datagram according to current calculating sets RT; If all transmission data are all identified, close RT; Otherwise receive new data to confirm, reset RT according to RTO; After finding RT time-out, retransmit and unidentifiedly send message the most already, and RTO is set doubles, repeat this process, until message retransmission success.
TCP downlink data Retransmission timeout in radio channel state handoff procedure, in the embodiment of the present invention, TCP Connection Proxy entity obtains the radio channel status information (it is by tunnel protocol GTP-U or IP protocol encapsulation) that base station equipment reports, and utilizes radio channel status information (radio channel status information that its tcp data stream monitored for base station equipment is corresponding) to reset RTO.Concrete, when TCP Connection Proxy entity utilizes radio channel status information to determine to eat dishes without rice or wine the generation of valid data transmission rate marked change (being particularly switched to low data rate from High Data Rate), adjust as required and sent but the RTO of the RT of still unacknowledged descending tcp data message, and follow-up RTT dynamic calculation implementation Process is intervened.
In the embodiment of the present invention, TCP Connection Proxy entity increases the process (namely adjusting the process of Retransmission timeout time parameter RTO) of the RTO of RT, specifically includes but not limited to as under type:
Step 1, TCP Connection Proxy entity when receiving radio channel status information (handover information as the modulating-coding pattern that base station equipment reports), the parameter RTO that record the one RTO(of current time and current RTT estimates) and the transmission of current time but still unacknowledged descending tcp data sequence number x.
If step 2 now RT starts, then TCP Connection Proxy entity resets the 2nd RTO and is: RTO*(max{1, a m/m
1); Wherein, m/m
1for the ratio of channel valid bit speed (i.e. normalization data rate); Further, when chnnel coding exponent number changes, m/m1=log
2(s/s
1), and s/s
1for the ratio of the exponent number of symbols every under different modulating coding mode.
Step 3, TCP Connection Proxy entity are determined after receiving radio channel status information, and before receiving the ACK covering x, adjustment Retransmission timeout time parameter RTO(the 3rd RTO) be the 2nd RTO.
Step 4, TCP Connection Proxy entity after receiving the ACK covering x, RTO(the 3rd RTO with after increasing) for initial value, recover RTT dynamic evaluation computational process.
The thought of current TCP congestion control constantly adjusts send window size, and combine to utilize and transmit feedback (packet loss, time delay etc.) information end to end and repeatedly sound out and mate current network path status, and its adjustment cycle is granularity with RTT, and real-time is inadequate.There is the error that cannot overcome in congested detection on the one hand, and the medium of wireless channel determines its link and is very easily interfered, and occurs interim packet loss and delay variation, is therefore difficult to the accuracy on guaranteed rate adjustment opportunity, causes decrease in efficiency.On the other hand, there is blindness in rate-matched, and owing to lacking the priori of transmission performance after changing state, TCP transmitting terminal rule of thumb can only carry out transmission rate adjustment, guarantees to remove as early as possible congested to sacrifice efficiency of transmission for cost.
In order to solve the problem, for terminal equipment by Cellular Networks packet domain access scene, towards radio channel state handoff scenario, in the embodiment of the present invention, by at packet domain gateway deployment TCP Connection Proxy entity, can shorten when channel status switches and feed back end to end and response delay (shortening RTT), improve the promptness of transfer of data adjustment reaction; Further, TCP Connection Proxy entity obtains the radio channel status information (it is by tunnel protocol GTP-U or IP protocol encapsulation) that base station equipment reports, and utilize radio channel status information (radio channel status information that its tcp data stream monitored for base station equipment is corresponding) to reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, thus can avoid congested, raise the efficiency.
In the embodiment of the present invention, TCP Connection Proxy entity reduces the data transmission rate of this TCP Connection Proxy entity, and notify that the equipment (as server) to this TCP Connection Proxy entity transmission data reduces the process of data transmission rate, specifically include but not limited to as under type:
Mode one, the down buffer storage of reusing window mode and rate-matched; Comprise the steps: under the manner
Step 1, TCP Connection Proxy entity are when receiving radio channel status information (handover information as the modulating-coding pattern that base station equipment reports), and the terminal equipment of record current time connects the terminal equipment receive window numerical value rwnd of downlink congestion window value cwnd and current time.
Step 2, TCP Connection Proxy entity reset send window swnd and are: min{cwnd
1, rwnd}.
Wherein, cwnd
1=max{iwnd, cwnd*(m/m
1), this iwnd is the initialization window of this TCP Connection Proxy entity; In addition, m/m
1for the ratio of channel valid bit speed (i.e. normalization data rate); Further, when chnnel coding exponent number changes, m/m1=log
2(s/s
1), and s/s
1for the ratio of the exponent number of symbols every under different modulating coding mode.
In the embodiment of the present invention, can also extend by only carrying out time-out when channel transmission rate declines, and when rising because modulating mode switches at channel transmission rate, still the detection mechanism of dependence TCP self is conservative increases, such as: cwnd
1=cwnd*(min{1, (m/m1) }).
Step 3, TCP Connection Proxy entity buffer memory are from the downlink data of the equipment (server) to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (m/m
1); Wherein, C
bufffor the single connection data buffer storage upper limit threshold of TCP Connection Proxy entity.
The down buffer storage of mode two, superposition window mode and rate-matched; Comprise the steps: under the manner
Step 1, TCP Connection Proxy entity are when receiving radio channel status information (handover information as the modulating-coding pattern that base station equipment reports), and the terminal equipment of record current time connects the terminal equipment receive window numerical value rwnd of downlink congestion window value cwnd and current time.
Step 2, TCP Connection Proxy entity reset bandwidth window wwnd ' and are: wwnd*(m/m
1), and reset send window swnd and be: min{cwnd, rwnd, wwnd ' }.
Wherein, wwnd is channel window parameter; Concrete, by amendment TCP Connection Proxy entity side tcp protocol stack congestion control logic, increase a channel window parameter wwnd, for reflecting the window size of bottleneck link in real time; At steady state, the numerical value=swnd window size of wwnd.
Wherein, m/m
1for the ratio of channel valid bit speed (i.e. normalization data rate); Further, when chnnel coding exponent number changes, m/m1=log
2(s/s
1), and s/s
1for the ratio of the exponent number of symbols every under different modulating coding mode.
Step 3, TCP Connection Proxy entity buffer memory are from the downlink data of the equipment (server) to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (swnd/swnd ') }; Wherein, C
bufffor the single connection data buffer storage upper limit threshold of TCP Connection Proxy entity, swnd attaches most importance to newly-installed send window, and swnd ' is the send window before resetting.
In sum, in the embodiment of the present invention, TCP Connection Proxy entity reasonably can adjust transmission rate based on radio channel status information, and the channel resource after utilizing modulating mode to switch in time efficiently, thus the waste of interface-free resources can be avoided.Further, the blind search shake of the TCP congestion control that wireless channel instability can be avoided to cause, avoid Retransmission timeout (as avoid the data cached bag of base station equipment and be about to issue follow-up data wrap in channel status switch after Retransmission timeout) with the phenomenon such as queue congestion, thus improve wireless data service Consumer's Experience.Further, by packet domain gateway deployment TCP Connection Proxy entity, when can shorten channel status switching, feed back and response delay (that is, shortening RTT) end to end, improve the promptness that transfer of data adjustment is reacted.
Embodiment two
Based on the inventive concept same with said method, additionally provide a kind of transmission control protocol TCP Connection Proxy entity in the embodiment of the present invention, as shown in Figure 3, this TCP Connection Proxy entity comprises:
Acquisition module 11, for obtaining radio channel status information;
Processing module 12, for according to described radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate.
In the embodiment of the present invention, described radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern; Or described radio channel status information is specially based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or described radio channel status information is specially small area jam indication information; Or described radio channel status information is specially channel bearing information;
Described acquisition module 11, specifically for receiving the radio channel status information that base station equipment reports.
In the embodiment of the present invention, described radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern; Or described radio channel status information is specially based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or described radio channel status information is specially small area jam indication information; Or described radio channel status information is specially channel bearing information;
Described processing module 12, specifically for when valid data transmission bit rate of determining according to described radio channel status information to eat dishes without rice or wine changes, adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, notify that the equipment sending data to this TCP Connection Proxy entity reduces data transmission rate.
Described processing module 12, the radio channel status information being further used for receiving according to the last time determines that corresponding transfer of data bit rate is greater than preset first threshold value, and when determining that corresponding transfer of data bit rate is less than default Second Threshold according to the radio channel status information that this receives, valid data transmission bit rate of determining to eat dishes without rice or wine changes; Wherein, described preset first threshold value is greater than described default Second Threshold.
Described processing module 12, specifically for when receiving described radio channel status information, record the one RTO of current time and the transmission of current time but still unacknowledged descending tcp data sequence number x;
Resetting the 2nd RTO is: described RTO*(max{1, a m/m
1); Wherein, described m/m
1for the ratio of channel valid bit speed;
Determine after receiving described radio channel status information, and before receiving the positive acknowledgement ACK covering described x, adjustment Retransmission timeout time parameter RTO is described 2nd RTO.
Described processing module 12, specifically for when receiving described radio channel status information, the terminal equipment of record current time connects downlink congestion window value cwnd and terminal equipment receive window numerical value rwnd;
Resetting send window swnd is: min{cwnd
1, rwnd}; Wherein, cwnd
1=max{iwnd, cwnd*(m/m
1), described iwnd is the initialization window of this TCP Connection Proxy entity, described m/m
1for the ratio of channel valid bit speed;
Buffer memory is from the downlink data of the equipment to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (m/m
1); Wherein, described C
bufffor the single connection data buffer storage upper limit threshold of this TCP Connection Proxy entity.
Described processing module 12, specifically for when receiving described radio channel status information, the terminal equipment of record current time connects downlink congestion window value cwnd and terminal equipment receive window numerical value rwnd;
Resetting bandwidth window wwnd ' is: wwnd*(m/m
1), and reset send window swnd and be: min{cwnd, rwnd, wwnd ' }; Wherein, described wwnd is channel window parameter, described m/m
1for the ratio of channel valid bit speed;
Buffer memory is from the downlink data of the equipment to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (swnd/swnd ') }; Wherein, described C
bufffor the single connection data buffer storage upper limit threshold of this TCP Connection Proxy entity, described swnd attaches most importance to newly-installed send window, and described swnd ' is the send window before resetting.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can be separated deployment.Above-mentioned module can merge into a module, also can split into multiple submodule further.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (14)
1., based on a transmission rate method of adjustment for wireless channel feedback, it is characterized in that, comprising:
Transmission control protocol TCP Connection Proxy entity obtains radio channel status information;
Described TCP Connection Proxy entity is according to described radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate.
2. the method for claim 1, is characterized in that, described radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern; Or described radio channel status information is specially based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or described radio channel status information is specially small area jam indication information; Or described radio channel status information is specially channel bearing information;
Described transmission control protocol TCP Connection Proxy entity obtains radio channel status information, specifically comprises:
Described TCP Connection Proxy entity receives the radio channel status information that base station equipment reports.
3. the method for claim 1, is characterized in that, described radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern; Or described radio channel status information is specially based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or described radio channel status information is specially small area jam indication information; Or described radio channel status information is specially channel bearing information;
Described TCP Connection Proxy entity is according to described radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, specifically comprises:
Described TCP Connection Proxy entity is when valid data transmission bit rate of determining according to described radio channel status information to eat dishes without rice or wine changes, adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate.
4. method as claimed in claim 3, is characterized in that, described TCP Connection Proxy entity changes according to described radio channel status information valid data transmission bit rate of determining to eat dishes without rice or wine, and specifically comprises:
According to the radio channel status information that the last time receives, described TCP Connection Proxy entity determines that corresponding transfer of data bit rate is greater than preset first threshold value, and when determining that corresponding transfer of data bit rate is less than default Second Threshold according to the radio channel status information that this receives, valid data transmission bit rate of determining to eat dishes without rice or wine changes; Wherein, described preset first threshold value is greater than described default Second Threshold.
5. the method as described in claim 1 or 3, is characterized in that, the process of described TCP Connection Proxy entity adjustment Retransmission timeout time parameter RTO, comprises further:
Described TCP Connection Proxy entity when receiving described radio channel status information, record the one RTO of current time and the transmission of current time but still unacknowledged descending tcp data sequence number x;
Described TCP Connection Proxy entity resets the 2nd RTO: described RTO*(max{1, a m/m
1); Wherein, described m/m
1for the ratio of channel valid bit speed;
Described TCP Connection Proxy entity is determined after receiving described radio channel status information, and before receiving the positive acknowledgement ACK covering described x, adjustment Retransmission timeout time parameter RTO is described 2nd RTO.
6. the method as described in claim 1 or 3, it is characterized in that, described TCP Connection Proxy entity reduces the data transmission rate of this TCP Connection Proxy entity, and notice sends the process of the equipment reduction data transmission rate of data to this TCP Connection Proxy entity, comprise further:
Described TCP Connection Proxy entity is when receiving described radio channel status information, and the terminal equipment of record current time connects downlink congestion window value cwnd and terminal equipment receive window numerical value rwnd;
Described TCP Connection Proxy entity resets send window swnd and is: min{cwnd
1, rwnd};
Wherein, cwnd
1=max{iwnd, cwnd*(m/m
1), described iwnd is the initialization window of this TCP Connection Proxy entity, described m/m
1for the ratio of channel valid bit speed;
Described TCP Connection Proxy entity buffer memory is from the downlink data of the equipment to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (m/m
1); Wherein, described C
bufffor the single connection data buffer storage upper limit threshold of described TCP Connection Proxy entity.
7. the method as described in claim 1 or 3, it is characterized in that, described TCP Connection Proxy entity reduces the data transmission rate of this TCP Connection Proxy entity, and notice sends the process of the equipment reduction data transmission rate of data to this TCP Connection Proxy entity, comprise further:
Described TCP Connection Proxy entity is when receiving described radio channel status information, and the terminal equipment of record current time connects downlink congestion window value cwnd and terminal equipment receive window numerical value rwnd;
Described TCP Connection Proxy entity resets bandwidth window wwnd ': wwnd*(m/m
1), and reset send window swnd and be: min{cwnd, rwnd, wwnd ' };
Wherein, described wwnd is channel window parameter, described m/m
1for the ratio of channel valid bit speed;
Described TCP Connection Proxy entity buffer memory is from the downlink data of the equipment to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (swnd/swnd ') }; Wherein, described C
bufffor the single connection data buffer storage upper limit threshold of described TCP Connection Proxy entity, described swnd attaches most importance to newly-installed send window, and described swnd ' is the send window before resetting.
8. a transmission control protocol TCP Connection Proxy entity, is characterized in that, comprising:
Acquisition module, for obtaining radio channel status information;
Processing module, for according to described radio channel status information adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate.
9. TCP Connection Proxy entity as claimed in claim 8, is characterized in that,
Described radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern; Or described radio channel status information is specially based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or described radio channel status information is specially small area jam indication information; Or described radio channel status information is specially channel bearing information;
Described acquisition module, specifically for receiving the radio channel status information that base station equipment reports.
10. TCP Connection Proxy entity as claimed in claim 8, is characterized in that,
Described radio channel status information is specially interface-free resources scheduling result and modulating-coding pattern; Or described radio channel status information is specially based on interface-free resources scheduling result and modulating-coding pattern established data transmission bit rate; Or described radio channel status information is specially small area jam indication information; Or described radio channel status information is specially channel bearing information;
Described processing module, specifically for when valid data transmission bit rate of determining according to described radio channel status information to eat dishes without rice or wine changes, adjustment Retransmission timeout time parameter RTO, reduce the data transmission rate of this TCP Connection Proxy entity, notify that the equipment sending data to this TCP Connection Proxy entity reduces data transmission rate.
11. TCP Connection Proxy entities as claimed in claim 10, is characterized in that,
Described processing module, the radio channel status information being further used for receiving according to the last time determines that corresponding transfer of data bit rate is greater than preset first threshold value, and when determining that corresponding transfer of data bit rate is less than default Second Threshold according to the radio channel status information that this receives, valid data transmission bit rate of determining to eat dishes without rice or wine changes; Wherein, described preset first threshold value is greater than described default Second Threshold.
12. TCP Connection Proxy entities as described in claim 8 or 10, is characterized in that,
Described processing module, specifically for when receiving described radio channel status information, record the one RTO of current time and the transmission of current time but still unacknowledged descending tcp data sequence number x;
Resetting the 2nd RTO is: described RTO*(max{1, a m/m
1); Wherein, described m/m
1for the ratio of channel valid bit speed;
Determine after receiving described radio channel status information, and before receiving the positive acknowledgement ACK covering described x, adjustment Retransmission timeout time parameter RTO is described 2nd RTO.
13. TCP Connection Proxy entities as described in claim 8 or 10, is characterized in that,
Described processing module, specifically for when receiving described radio channel status information, the terminal equipment of record current time connects downlink congestion window value cwnd and terminal equipment receive window numerical value rwnd;
Resetting send window swnd is: min{cwnd
1, rwnd}; Wherein, cwnd
1=max{iwnd, cwnd*(m/m
1), described iwnd is the initialization window of this TCP Connection Proxy entity, described m/m
1for the ratio of channel valid bit speed;
Buffer memory is from the downlink data of the equipment to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (m/m
1); Wherein, described C
bufffor the single connection data buffer storage upper limit threshold of this TCP Connection Proxy entity.
14. TCP Connection Proxy entities as described in claim 8 or 10, is characterized in that,
Described processing module, specifically for when receiving described radio channel status information, the terminal equipment of record current time connects downlink congestion window value cwnd and terminal equipment receive window numerical value rwnd;
Resetting bandwidth window wwnd ' is: wwnd*(m/m
1), and reset send window swnd and be: min{cwnd, rwnd, wwnd ' }; Wherein, described wwnd is channel window parameter, described m/m
1for the ratio of channel valid bit speed;
Buffer memory is from the downlink data of the equipment to this TCP Connection Proxy entity transmission data, receive window numerical value in uplink ACK is revised as rwnd ', and the equipment that notice sends data to this TCP Connection Proxy entity reduces data transmission rate, the equipment adjustment data transmission rate sending data to TCP Connection Proxy entity by this is: min{C
buff, rwnd ' * (swnd/swnd ') }; Wherein, described C
bufffor the single connection data buffer storage upper limit threshold of this TCP Connection Proxy entity, described swnd attaches most importance to newly-installed send window, and described swnd ' is the send window before resetting.
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