CN105187175A - Method and system for downlink transmission control of base station - Google Patents
Method and system for downlink transmission control of base station Download PDFInfo
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- CN105187175A CN105187175A CN201510632458.3A CN201510632458A CN105187175A CN 105187175 A CN105187175 A CN 105187175A CN 201510632458 A CN201510632458 A CN 201510632458A CN 105187175 A CN105187175 A CN 105187175A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1832—Details of sliding window management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/187—Details of sliding window management
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention relates to a method and a system for downlink transmission control of a base station. The method comprises the following steps of receiving a data packet sent by a server and storing the data packet in a local cache; receiving a first response package for a data packet with a sequence number of N at a user side; setting maximum advanced response quantity according to a wireless transmission error rate of a communication link to the user side; when the sequence number of the data packet in the local cache is continuous and the current advanced response quantity M is less than the maximum advanced response quantity, sending a second response packet for a data packet with a sequence number of M+N to the server; and when the sequence number of the data packet is discontinuous, continuously sending the second response packet corresponding to a lost data packet to the server for K times at intervals until the lost data packet sent by the server is received. The method and the system for downlink transmission control of the base station fully consider a quantity factor of an air interface of the base station and can timely and preferentially take care of more urgent data transmission requirement for the terminal, so that the whole transmission efficiency is improved.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of base station down transfer control method and device.
Background technology
In mobile communication technology field, user has had very large demand to data download service, high-speed downloads has also become the significant demand of radio communication, but data service is downloaded, upload too busy to get away TCP (TransmissionControlProtocol, transmission control protocol), in current moving communicating field, the focus of work of base station is the transfer of data Realization and maintenance under legacy protocol framework, such as, LTE (LongTermEvolution, 3GPP Long Term Evolution) MAC (MediaAccessControl in standard base station, medium access control), RLC (RadioLinkControl, wireless spread-spectrum technology), PDCP (PacketDataConvergenceProtocol, PDCP Packet Data Convergence Protocol) etc. Data Transport Protocol, comparatively weak to the relevant treatment of tcp protocol layer, even blank.In the network environment of some complexity, base station itself is paid close attention to not to the tcp data bag involved by end-user listening data, causes the network passback that mass data is unnecessary, causes the waste of the network bandwidth, interface-free resources.The feature that tcp data strictly transmits according to the order of sequence simultaneously also makes in some cases, special data package more promptly compares other packets, most of base station is not owing to setting foot in the related content of terminal data TCP layer regrettably, to a certain degree causes base station can not in time, preferentially look after the comparatively urgent data transfer demands of terminal yet.
Existing system is not owing to setting foot in user TCP/IP packet data content, fail proxy terminal in advance feedback server acknowledge on Transmission Control Protocol, also fail to grasp user's transport layer data dynamic, the events such as Network Packet Loss are failed to make a response prior to terminal use, cause network turn around time long, retransmit speed slow.Although minority system has possessed TCP network side agent functionality, but implementation mostly is, and to receive downlink data packet directly single to server acknowledge, premature ACK logic in advance, fail to consider to eat dishes without rice or wine qualitative factor in base station, under the scene that quality of eating dishes without rice or wine is not good, accelerate and the downlink data that arrives is smooth in air interface transmission, thus cause overall transfer efficiency low.
Summary of the invention
Based on this, be necessary, for the low problem of prior art efficiency of transmission, to provide a kind of base station down transfer control method and device.
A kind of base station down transfer control method, comprises the following steps:
The packet that reception server sends, is stored in local cache by described packet;
Receive the first response packet that user side is the packet of N to sequence number; Wherein, described first response packet is the response of user side to the packet that base station sends; N is positive integer;
According to the wireless transmission error rate of the communication link between user side, maximum premature ACK amount is set; Wherein, described maximum premature ACK amount is that base station sends the advance adjustment up to stop of response packet in advance to server;
When the sequence number of the packet in local cache is continuous and current premature ACK amount M is less than maximum premature ACK amount, sending sequence number to server is the second response packet of the packet of M+N; Wherein, described second response packet is the response of base station to the packet that server sends; M is positive integer, and initial value is 0;
When the sequence number of packet is discontinuous, at set intervals the second corresponding for the packet of loss response packet is sent K time continuously to server, until receive the packet of the described loss that server sends; Wherein, K be not less than 3 integer.
A kind of base station down transmission control system, comprising:
First receiver module, for the packet that reception server sends, be stored in local cache by described packet, and whether the sequence number detecting described packet is continuous;
Second receiver module, for receiving the first response packet that user side is the packet of N to sequence number; Wherein, described first response packet is the response of user side to the packet that base station sends; N is positive integer;
Premature ACK adjusting module, for arranging maximum premature ACK amount according to the wireless transmission error rate of the communication link between user side; Wherein, described maximum premature ACK amount is that base station sends the advance adjustment up to stop of response packet in advance to server;
Premature ACK module, for when the sequence number of the packet in local cache is continuous and current premature ACK amount M is less than maximum premature ACK amount, sending sequence number to server is the second response packet of the packet of M+N; Wherein, described second response packet is the response of base station to the packet that server sends; M is positive integer, and initial value is 0;
Duplicate answer module, for when the sequence number of packet is discontinuous, sends K time to server by the second corresponding for the packet of loss response packet at set intervals continuously in advance, until receive the packet of the described loss that server sends; Wherein, K be not less than 3 integer.
Above-mentioned base station down transfer control method and system, the maximum premature ACK amount of system is set according to the wireless transmission error rate of the communication link between user side, take into full account to eat dishes without rice or wine qualitative factor in base station, side wireless transmission of eating dishes without rice or wine and network side wire transmission are done to a certain extent and are merged, can under the scene that quality of eating dishes without rice or wine is not good, the transmission that restriction downlink data is being eated dishes without rice or wine, accelerates the transmission that downlink data is being eated dishes without rice or wine when quality of eating dishes without rice or wine is better; And by shifting to an earlier date duplicate answer, preferentially sending the request to lost data packets, can in time, preferentially look after the comparatively urgent data transfer demands of terminal, thus improve overall transfer efficiency.
Accompanying drawing explanation
Fig. 1 is traditional LTE base station data transmission architecture figure;
Fig. 2 is the base station architecture figure being provided with TCP agent of an embodiment;
Fig. 3 is the base station down transfer control method flow chart of an embodiment;
Fig. 4-a is the duplicate answer schematic diagram in advance of an embodiment;
Fig. 4-b is the premature ACK schematic diagram of an embodiment;
Fig. 5 is the method flow diagram arranging maximum premature ACK amount of an embodiment;
Fig. 6 process chart that to be the reception user side of an embodiment to sequence number be after the first response packet of the packet of N;
Fig. 7 is the structural representation of the base station down transmission control system of the first embodiment;
Fig. 8 is the structural representation of the second receiver module of an embodiment;
Fig. 9 is the structural representation of the premature ACK adjusting module of an embodiment;
Figure 10 is the structural representation of the base station down transmission control system of the second embodiment.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further elaborated.
The present situation of existing moving communicating field base station for simplifying the analysis, for LTE standard base station, its data transmission and processing is broadly directed to the main protocol such as MAC, RLC, PDCP, S1, wherein S1 layer data form is connected the protocol data process such as network data transmission and inside of base station PDCP, and the protocol architecture that data flow relates to as shown in Figure 1.
Existing base station down transmission control relates generally to following agreement:
1) S1 agreement relevant treatment, S1 accepts base station network side data, based on internet protocol (IP) packet of terminal use, S1 adds corresponding header information, namely mail to network side after packing, oppositely in like manner, receive the data from network side, reject S1 corresponding heads information, mail to base station downstream module (PDCP);
2) PDCP agreement relevant treatment, PDCP (PacketDataConvergenceProtocol) layer belongs to the second layer of Radio interface protocols stack, RRM (RRC) message of processing controls plane and internet protocol (IP) bag of user plane.On the user plane, PDCP sublayer obtains the IP packet bag from upper strata, head compression and encryption can be carried out to IP packet, then rlc sublayer is delivered to, oppositely in like manner, receive the data from rlc sublayer, decompress through head, decipher, also internet protocol (IP) the packet bag of original subscriber mails to up-stream module (S1);
3) RLC/MAC/PHY agreement relevant treatment, LTE base station relates to the process in this three large field, is and realizes in strict accordance with protocol, does not do tired stating at this.
Existing system has following deficiency:
(1) existing system is not owing to setting foot in user TCP/IP packet data content, and non-proxy terminal shifts to an earlier date feedback server acknowledge on Transmission Control Protocol, and this respect work can reduce network turn around time;
(2) existing system is not owing to setting foot in user TCP/IP packet data content, fail to grasp user's transport layer data dynamic, the events such as Network Packet Loss are failed to make a response prior to terminal use, such as base station shifts to an earlier date feedback server duplicate answer, and this respect work can trigger Fast retransmission;
(3) although minority system has possessed TCP network side agent functionality, but implementation mostly is, and to receive downlink data packet directly single to server acknowledge, premature ACK logic in advance, fail to consider to eat dishes without rice or wine qualitative factor in base station, cause under the scene that quality of eating dishes without rice or wine is not good, accelerated and downlink data that is that arrive is smooth in air interface transmission, thus cause the deterioration of overall transfer efficiency.
The present invention is in above-mentioned data transmission structure, and add the processing unit of special reply terminal use tcp protocol layer data, as shown in Figure 2, it is identical that scheme is introduced in other standard base stations to the protocol architecture after introducing.
A kind of control method and device optimizing base station down transmission provided by the invention, be applicable to various standard base station equipment, comprise GSM, CDMA, WCDMA, TD-SCDMA, FDD-LTE, TDD-LTE, WLAN etc., also for ease of the existing base station system of Simplified analysis, still launch to describe for LTE standard base station, shortcoming and the scheme of introducing of other standard base stations are all identical with LTE standard base station.
As shown in Figure 3, base station down transfer control method of the present invention can comprise the following steps:
S1, the packet that reception server sends, is stored in local cache by described packet;
S2, receives the first response packet that user side is the packet of N to sequence number; Wherein, described first response packet is the response of user side to the packet that base station sends; N is positive integer;
S3, arranges maximum premature ACK amount according to the wireless transmission error rate of the communication link between user side; Wherein, described maximum premature ACK amount is that base station sends the advance adjustment up to stop of response packet in advance to server;
S4, when the sequence number of the packet in local cache is continuous and current premature ACK amount M is less than maximum premature ACK amount, sending sequence number to server is the second response packet of the packet of M+N; Wherein, described second response packet is the response of base station to the packet that server sends; M is positive integer, and initial value is 0;
S5, when the sequence number of packet is discontinuous, sends K time to server by the second corresponding for the packet of loss response packet at set intervals continuously, until receive the packet of the described loss that server sends; Wherein, K be not less than 3 integer.
In practical application, base station can arrange a data field in inside, the relevant information that the TCP being used for storing current existence connects, comprise source IP address that TCP connects, object IP address, source port number, destination slogan, the up-to-date tcp data bag received from server sequence number, up-to-dately send to the confirmation of the TCP response packet of server number, the up-to-date confirmation number sending to the sequence number of the tcp data bag of user side, the up-to-date TCP response packet received from user side, and corresponding TCP Connection Cache by server tcp data bag mailing to user side etc.When base station receive server mail to the tcp data bag of certain user side time, first resolve the protocol header of tcp data bag, determine whether this user side is set up TCP with this base station and be connected according to analysis result.
After base station receives the packet of server transmission, described packet can be stored in local cache, and whether the sequence number detecting described packet is continuous.Because tcp data bag is strictly according to the order of sequence, if the sequence number of described packet is continuous, then represent that the packet that base station receives is complete, does not have lost data packets; Otherwise, represent that the data that base station receives are surrounded by packet loss.As depicted in fig. 4-a, the packet that sequence number is 1100 to 1199 is lacked, the IP packet loss that therefore, sequence number is 1100, length is 100 in the packet that base station receives.
If there is no lost data packets, premature ACK operation can be performed.The response packet that base station can return according to user side determines premature ACK amount.As shown in Fig. 4-b, suppose that user successfully receives IP bag [500-599], then return the response packet that IP bag [500-599] is corresponding to base station, for sending IP bag [600-699] to base station requests.
As shown in Figure 5, in practical situations both, also can arrange maximum premature ACK amount according to the wireless transmission error rate of the communication link between base station to user side, concrete grammar is as follows:
S31, arranges multiple error rate interval, and arranges the interval corresponding premature ACK amount threshold value of each error rate;
S32, detects the wireless transmission error rate of the communication link between user side;
S33, judges that the error rate belonging to the described wireless transmission error rate is interval, and maximum premature ACK amount is set to the interval corresponding premature ACK amount threshold value of the described error rate.In one embodiment, the maximum premature ACK amount of system can be set according to the relation of the wireless transmission error rate shown in table 1 and maximum premature ACK amount.But the embodiment shown in table 1 is exclusive embodiment of the present invention not, can arrange the relation of the different wireless transmission error rates and maximum premature ACK amount according to actual needs.
The relation of the table 1 wireless transmission error rate and maximum premature ACK amount
| Premature ACK degree | Bler(％) | Maximum premature ACK amount (bag) |
| 5 | 0—5 | 10 |
| 4 | 6—10 | 5 |
| 3 | 11—20 | 3 |
| 2 | 21—30 | 1 |
| 1 | 31—100 | 0 |
As shown in Fig. 4-b, suppose that the wireless transmission error rate is now 15%, according to the relation of the wireless transmission error rate shown in table 1 and maximum premature ACK amount, maximum premature ACK amount can be set to 3.Such as, when user side to return the response to IP bag [500-599] to base station, base station can send response to IP bag [900-999] to server at most.
Base station can arrange current premature ACK amount M, and its initial value is set to 0.Base station can judge whether current premature ACK amount M is more than or equal to maximum premature ACK amount.Such as, in Fig. 4-b, suppose that maximum premature ACK amount is 3, base station has received the response of user side to IP bag [500-599], then now current premature ACK amount M is less than maximum premature ACK amount.Base station can send the response of IP being wrapped to [500-599] to server, then the value of M is added 1.Now, the value of M is 1, and base station can send the response of IP being wrapped to [600-699] to server, then the value of M is added 1.Now, the value of M is 2, and base station can send the response of IP being wrapped to [700-799] to server, then the value of M is added 1.Now, the value of M is 3, and base station can send the response of IP being wrapped to [800-899] to server, then the value of M is added 1.Now the value of M is 4, base station no longer sends response packet to server, until receive the response of user side to IP bag [600-699], base station just sends the response to IP bag [900-999] to server, then waits for the response of user side to IP bag [700-799].Follow-up answering by that analogy.
If lost data packets, duplicate answer operation in advance can be performed.As depicted in fig. 4-a, IP bag [1100-1199] loses, then base station can send the response of IP being wrapped to [1100-1199] to server, and request server retransmits IP bag [1100-1199].In in advance duplicate answer process, be make server priority send the packet lost, response packet corresponding for the packet of loss can be sent K time continuously to server, K be not less than 3 integer.Such as, in Fig. 4-a, K=3.Also according to actual conditions, K value can be set to the value that 4 or 5 or other are not less than 3.
In one embodiment, also according to local cache, according to Transmission Control Protocol, selective acknowledgement scaling option can be set in the second response packet; Wherein, described selective acknowledgement scaling option comprises the sequence number of the packet after the packet of loss.Such as, in Fig. 4-a, SACK (SelectedAcknowledgement) can be added after response packet, in described SACK, carry the sequence number of the packet [1200-1299] after IP bag [1100-1199] of loss.
As shown in Figure 6, upon step s 2, also following steps can be performed:
S21, compares the user side up-to-date confirmation number that the confirmation in the first response packet number and base station are recorded;
S22, if the confirmation number in the first response packet equals the up-to-date confirmation number of user side of base station record, then searches the packet of the first response packet request in local cache; If find, then the first response packet is abandoned, by the Packet Generation of the first response packet request to user side; Otherwise, be the second response packet of the packet of N to sequence number to server transmission;
S23, if the confirmation number in the first response packet is greater than the up-to-date confirmation number of user side of base station record, is then updated to confirmation number in the first response packet by the user side up-to-date confirmation number that base station is recorded, and to discharge sequence number in local cache be the internal memory of the packet of N;
S24, if the confirmation number in the first response packet is less than the up-to-date confirmation number of user side of base station record, is then sent to server by the second response packet.
If the confirmation number in the first response packet equals the up-to-date confirmation number of user side of base station record, then belonging to duplicate answer, there is packet loss in the packet that namely now user side receives.According to the confirmation number in described first response packet, base station searches the packet of described confirmation number request first in the buffer; If find, then described first response packet is abandoned, and by the Packet Generation of described first response packet request to user side; If do not find corresponding data bag in the buffer, then illustrate that base station does not correctly receive this packet from server, now, base station sends the response packet to the packet of this loss to service, and request server resends the packet of this loss.
If the confirmation number in the first response packet is greater than the up-to-date confirmation number of user side of base station record, then what show that user side returns is response packet to new packet.Such as, in Fig. 4-b, the confirmation number of the response packet to IP bag [500-599], after receiving the response packet to IP bag [500-599] that user side returns, is recorded in base station, and sends IP bag [600-699] to user side.After this, user side can return the response packet to IP bag [600-699] to base station.Because user side is greater than the confirmation number in the response packet of IP bag [500-599] to the confirmation number in the response packet of IP bag [600-699], up-to-date for the user side of record confirmation number can be updated to the confirmation number in the first response packet by base station, and to discharge sequence number in local cache be the internal memory of the packet of N.
If the confirmation number in the first response packet is less than the up-to-date confirmation number of user side of base station record, then represent that the response of user side is delayed response.Due to base station proxy user end send response packet to server, therefore, the delayed response of user side can not impact the reception of packet.Now, the response packet that user side sends can abandon by base station, also directly the response packet of the transmission of user side can be forwarded to server.
In one embodiment, base station down transfer control method of the present invention also can comprise the following steps:
Whether the confirmation number judging in the first response packet is greater than the confirmation number in the second response packet; If so, the confirmation in the second response packet number is updated to the confirmation number in the first response packet.
If the confirmation number in the first response packet is greater than the confirmation number in the second response packet, then the response degree of response degree prior to base station of user side is described.When quality of eating dishes without rice or wine is better than network quality, this thing happens for possibility.For Fig. 4-a, when IP bag [1100-1199] lose time, base station always to server request send IP bag [1100-1199], simultaneously by IP bag [1100-1199] before Packet Generation to user side.When after the packet that user side receives before IP bag [1100-1199], can to the response packet of the above-mentioned packet of base station feedback, until receive the entire packet of IP bag [1100-1199].Now, if base station receives IP bag [1100-1199] that server sends, IP can be wrapped [1100-1199] and be sent to user side.When quality of eating dishes without rice or wine is better than network quality, the response of user side to IP bag [1100-1199] may have precedence over the response of base station to IP bag [1100-1199].Now, the confirmation in the second response packet number can be updated to the confirmation number in the first response packet, and send the second response packet to server.
Base station down transfer control method of the present invention has following characteristics:
(1) this method is under wireless environment and all good scene of network environment, base station proxy user end premature ACK, greatly can accelerate downlink network transfer of data, shorten network turn around time, user unloading speed be had to the lifting of matter;
(2) under this method, the better scene of network environment not good enough at wireless environment, base station is weakened the degree of proxy user end premature ACK or is not done premature ACK, center of gravity goes to and ensures that tcp data retransmits, duplicate answer filtration work, decreases unnecessary network passback, weakens wireless survey transmission not freely to the negative effect of network side;
(3) under scene that this method is better at wireless environment, network environment is not good enough, base station proxy user end shifts to an earlier date duplicate answer, greatly can accelerate the Fast retransmission of the webserver, be supported in duplicate answer simultaneously and add selective acknowledgement extension, adapt to the transport layer rhythm of correspondent network server, to the downloading rate fluctuation that Network Packet Loss causes, there is certain smooth effect;
(4) this method is under wireless environment and all not good enough scene of network environment, the tcp data carrying out user side retransmits, duplicate answer is filtered, the in advance work such as duplicate answer, weaken wireless environment not good to Internet Transmission, Network Packet Loss to the double negative effect of overall transfer.
Above-mentioned base station down transfer control method, can merge eat dishes without rice or wine side wireless transmission and network side wire transmission, proxy terminal TCP affairs, optimizing data performance, level and smooth environmental fluctuating affect, thus lifting Consumer's Experience.
Be described further below in conjunction with the embodiment of accompanying drawing to base station down transmission control system of the present invention.
Fig. 7 is the structural representation of base station down transmission control system of the present invention.Base station down transmission control system of the present invention can comprise:
First receiver module 10, for the packet that reception server sends, is stored in local cache by described packet;
Second receiver module 20, for receiving the first response packet that user side is the packet of N to sequence number; Wherein, described first response packet is the response of user side to the packet that base station sends; N is positive integer;
Premature ACK adjusting module 30, for arranging maximum premature ACK amount according to the wireless transmission error rate of the communication link between user side; Wherein, described maximum premature ACK amount is that base station sends the advance adjustment up to stop of response packet in advance to server;
Premature ACK module 40, for when the sequence number of the packet in local cache is continuous and current premature ACK amount M is less than maximum premature ACK amount, sending sequence number to server is the second response packet of the packet of M+N; Wherein, described second response packet is the response of base station to the packet that server sends; M is positive integer, and initial value is 0;
Duplicate answer module 50, for when the sequence number of packet is discontinuous, sends K time to server by the second corresponding for the packet of loss response packet at set intervals continuously in advance, until receive the packet of the described loss that server sends; Wherein, K be not less than 3 integer.
As shown in Figure 8, in one embodiment, described second receiver module 20 can comprise:
Comparing unit 201, compares for the user side up-to-date confirmation number of being recorded in the confirmation in the first response packet number and base station;
Search unit 202, if equal the up-to-date confirmation number of user side of base station record for the confirmation in the first response packet number, then in local cache, search the packet of the first response packet request; If find, then the first response packet is abandoned, by the Packet Generation of the first response packet request to user side; Otherwise, be the second response packet of the packet of N to sequence number to server transmission;
Updating block 203, if be greater than the up-to-date confirmation number of user side of base station record for the confirmation in the first response packet number, then the user side up-to-date confirmation number that base station is recorded is updated to confirmation number in the first response packet, and to discharge sequence number in local cache be the internal memory of the packet of N;
Transmitting element 204, if the up-to-date confirmation number of user side being less than base station record for the confirmation in the first response packet number, is then sent to server by the second response packet.
As shown in Figure 9, in one embodiment, described premature ACK adjusting module 30 can comprise:
Setting unit 301, interval for arranging multiple error rate, and the interval corresponding premature ACK amount threshold value of each error rate is set;
Detecting unit 302, for detecting the wireless transmission error rate of the communication link between user side;
Judging unit 303, interval for judging the error rate belonging to the described wireless transmission error rate, and maximum premature ACK amount is set to the interval corresponding premature ACK amount threshold value of the described error rate.
As shown in Figure 10, in one embodiment, base station down transmission control system of the present invention also can comprise:
Update module 60, whether the confirmation number for judging in the first response packet is greater than the confirmation number in the second response packet; If so, the confirmation in the second response packet number is updated to the confirmation number in the first response packet.
Base station down transmission control system of the present invention has following characteristics:
(1) described system is under wireless environment and all good scene of network environment, base station proxy user end premature ACK, greatly can accelerate downlink network transfer of data, shorten network turn around time, user unloading speed be had to the lifting of matter;
(2) under described system, the better scene of network environment not good enough at wireless environment, base station is weakened the degree of proxy user end premature ACK or is not done premature ACK, center of gravity goes to and ensures that tcp data retransmits, duplicate answer filtration work, decreases unnecessary network passback, weakens wireless survey transmission not freely to the negative effect of network side;
(3) under scene that described system is better at wireless environment, network environment is not good enough, base station proxy user end shifts to an earlier date duplicate answer, greatly can accelerate the Fast retransmission of the webserver, be supported in duplicate answer simultaneously and add selective acknowledgement extension, adapt to the transport layer rhythm of correspondent network server, to the downloading rate fluctuation that Network Packet Loss causes, there is certain smooth effect;
(4) described system is under wireless environment and all not good enough scene of network environment, the tcp data carrying out user side retransmits, duplicate answer is filtered, the in advance work such as duplicate answer, weaken wireless environment not good to Internet Transmission, Network Packet Loss to the double negative effect of overall transfer.
Above-mentioned base station down transmission control system, can merge eat dishes without rice or wine side wireless transmission and network side wire transmission, proxy terminal TCP affairs, optimizing data performance, level and smooth environmental fluctuating affect, thus lifting Consumer's Experience.
Base station down transmission control system of the present invention and base station down transfer control method one_to_one corresponding of the present invention, the technical characteristic of setting forth in the embodiment of above-mentioned base station down transfer control method and beneficial effect thereof are all applicable to, in the embodiment of base station down transmission control system, hereby state.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a base station down transfer control method, is characterized in that, comprises the following steps:
The packet that reception server sends, is stored in local cache by described packet;
Receive the first response packet that user side is the packet of N to sequence number; Wherein, described first response packet is the response of user side to the packet that base station sends; N is positive integer;
According to the wireless transmission error rate of the communication link between user side, maximum premature ACK amount is set; Wherein, described maximum premature ACK amount is that base station sends the advance adjustment up to stop of response packet in advance to server;
When the sequence number of the packet in local cache is continuous and current premature ACK amount M is less than maximum premature ACK amount, sending sequence number to server is the second response packet of the packet of M+N; Wherein, described second response packet is the response of base station to the packet that server sends; M is positive integer, and initial value is 0;
When the sequence number of packet is discontinuous, at set intervals the second corresponding for the packet of loss response packet is sent K time continuously to server, until receive the packet of the described loss that server sends; Wherein, K be not less than 3 integer.
2. base station down transfer control method according to claim 1, it is characterized in that, when the sequence number of packet is continuous and current premature ACK amount M is less than maximum premature ACK amount, sends to server and the step that sequence number is the second response packet of the packet of M+N comprised:
Whether the sequence number detecting the packet in local cache is continuous;
When the sequence number consecutive hours of the packet in local cache, judge whether current premature ACK amount M is more than or equal to maximum premature ACK amount; If so, current premature ACK amount is kept to send the second response packet to server; Otherwise, send to server to sequence number be the packet of M+N the second response packet after, the value of M is added 1, and repeats to judge that current premature ACK amount M is no more than the step of maximum premature ACK amount.
3. base station down transfer control method according to claim 1, is characterized in that, the step arranging maximum premature ACK amount according to the wireless transmission error rate of the communication link between user side comprises:
It is interval that multiple error rate is set, and the interval corresponding premature ACK amount threshold value of each error rate is set;
The wireless transmission error rate of the communication link between user side detected;
Judge that the error rate belonging to the described wireless transmission error rate is interval, and maximum premature ACK amount is set to the interval corresponding premature ACK amount threshold value of the described error rate.
4. base station down transfer control method according to claim 1, is characterized in that, after reception user side to sequence number is the first response packet of the packet of N, further comprising the steps of:
The user side up-to-date confirmation number that confirmation in first response packet number and base station are recorded is compared;
If the confirmation number in the first response packet equals the up-to-date confirmation number of user side of base station record, then in local cache, search the packet of the first response packet request; If find, then the first response packet is abandoned, by the Packet Generation of the first response packet request to user side; Otherwise, be the second response packet of the packet of N to sequence number to server transmission;
If the confirmation number in the first response packet is greater than the up-to-date confirmation number of user side of base station record, then the user side up-to-date confirmation number that base station is recorded is updated to confirmation number in the first response packet, and to discharge sequence number in local cache be the internal memory of the packet of N;
If the confirmation number in the first response packet is less than the up-to-date confirmation number of user side of base station record, then the second response packet is sent to server.
5. base station down transfer control method according to claim 1, is characterized in that, further comprising the steps of:
Whether the confirmation number judging in the first response packet is greater than the confirmation number in the second response packet; If so, the confirmation in the second response packet number is updated to the confirmation number in the first response packet.
6. base station down transfer control method according to claim 1, is characterized in that, the second corresponding for the packet of loss response packet is sent K the step to server continuously and comprises:
According to local cache, according to Transmission Control Protocol, selective acknowledgement scaling option is set in the second response packet; Wherein, described selective acknowledgement scaling option comprises the sequence number of the packet after the packet of loss.
7. a base station down transmission control system, is characterized in that, comprising:
First receiver module, for the packet that reception server sends, be stored in local cache by described packet, and whether the sequence number detecting described packet is continuous;
Second receiver module, for receiving the first response packet that user side is the packet of N to sequence number; Wherein, described first response packet is the response of user side to the packet that base station sends; N is positive integer;
Premature ACK adjusting module, for arranging maximum premature ACK amount according to the wireless transmission error rate of the communication link between user side; Wherein, described maximum premature ACK amount is that base station sends the advance adjustment up to stop of response packet in advance to server;
Premature ACK module, for when the sequence number of the packet in local cache is continuous and current premature ACK amount M is less than maximum premature ACK amount, sending sequence number to server is the second response packet of the packet of M+N; Wherein, described second response packet is the response of base station to the packet that server sends; M is positive integer, and initial value is 0;
Duplicate answer module, for when the sequence number of packet is discontinuous, sends K time to server by the second corresponding for the packet of loss response packet at set intervals continuously in advance, until receive the packet of the described loss that server sends; Wherein, K be not less than 3 integer.
8. base station down transmission control system according to claim 7, is characterized in that, premature ACK adjusting module comprises:
Setting unit, interval for arranging multiple error rate, and the interval corresponding premature ACK amount threshold value of each error rate is set;
Detecting unit, for detecting the wireless transmission error rate of the communication link between user side;
Judging unit, interval for judging the error rate belonging to the described wireless transmission error rate, and maximum premature ACK amount is set to the interval corresponding premature ACK amount threshold value of the described error rate.
9. base station down transmission control system according to claim 7, is characterized in that, the second receiver module comprises:
Comparing unit, compares for the user side up-to-date confirmation number of being recorded in the confirmation in the first response packet number and base station;
Search unit, if equal the up-to-date confirmation number of user side of base station record for the confirmation in the first response packet number, then in local cache, search the packet of the first response packet request; If find, then the first response packet is abandoned, by the Packet Generation of the first response packet request to user side; Otherwise, be the second response packet of the packet of N to sequence number to server transmission;
Updating block, if be greater than the up-to-date confirmation number of user side of base station record for the confirmation in the first response packet number, then the user side up-to-date confirmation number that base station is recorded is updated to confirmation number in the first response packet, and to discharge sequence number in local cache be the internal memory of the packet of N;
Transmitting element, if the up-to-date confirmation number of user side being less than base station record for the confirmation in the first response packet number, is then sent to server by the second response packet.
10. base station down transmission control system according to claim 7, is characterized in that, also comprise:
Update module, whether the confirmation number for judging in the first response packet is greater than the confirmation number in the second response packet; If so, the confirmation in the second response packet number is updated to the confirmation number in the first response packet.
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