CN112615760A - Data transmission method, device, base station and storage medium - Google Patents

Data transmission method, device, base station and storage medium Download PDF

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Publication number
CN112615760A
CN112615760A CN202011507395.6A CN202011507395A CN112615760A CN 112615760 A CN112615760 A CN 112615760A CN 202011507395 A CN202011507395 A CN 202011507395A CN 112615760 A CN112615760 A CN 112615760A
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response message
tcp response
data
packet
tcp
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CN202011507395.6A
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CN112615760B (en
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郑自永
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Comba Network Systems Co Ltd
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Comba Network Systems Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0829—Packet loss
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

The application relates to a data transmission method, a data transmission device, a base station and a storage medium. The method comprises the following steps: the base station carries out packet loss detection on downlink data to be sent, and acquires the identifier of a missing data packet in the downlink data to be sent; then, a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to the downlink data is obtained; according to the missing data packet identification and the TCP response message, a new TCP response message is established and sent to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet. By adopting the method, the transmission efficiency of the downlink data can be improved.

Description

Data transmission method, device, base station and storage medium
Technical Field
The present application relates to the field of communications technologies, and in particular, to a data transmission method, an apparatus, a base station, and a storage medium.
Background
In the technical field of mobile communication, a Packet Data Convergence Protocol (PDCP) layer in a base station is used to perform operations such as segment chaining, header compression, and encryption on Data sent by a Radio Resource Control (RRC) layer. In the operation process of the PDCP layer, if the transmission of a data packet of downlink data is overtime, or after a data transmission queue in the PDCP layer is full, the PDCP layer may perform packet loss processing on the data packet.
In a conventional method, when receiving downlink data sent by a base station, a User Equipment (User Equipment, abbreviated as UE) may send request information of a next data packet to the base station according to a sequence number of a received previous data packet. If the downlink data sent by the base station has a data packet loss condition, and the UE cannot receive the next data packet, the UE repeatedly sends the request information to the base station. And after receiving the request information of the same data packet for multiple times, the base station sends a retransmission request to the server, so that the data packet retransmitted by the server is sent to the UE.
However, the above method results in low transmission efficiency of downlink data.
Disclosure of Invention
In view of the above, it is necessary to provide a data transmission method, apparatus, base station and storage medium for solving the above technical problems.
A method of data transmission, said method comprising:
performing packet loss detection on downlink data to be transmitted, and acquiring an identifier of a missing data packet in the downlink data to be transmitted;
acquiring a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to downlink data;
according to the missing data packet identification and the TCP response message, a new TCP response message is established and sent to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
In one embodiment, the identifier of the data packet is a TCP sequence number of the data packet; according to the lost data packet identification and the TCP response message, a new TCP response message is established, which comprises the following steps:
determining selective acknowledgement SACK information according to the TCP sequence number of the missing data packet; SACK information comprises TCP serial numbers of data packets which are not lost in downlink data to be sent;
adding SACK information into a TCP response message to obtain a new TCP response message; the new TCP response message is specifically used to instruct the server to determine the TCP sequence number of the missing data packet based on the TCP sequence number of the data packet that is not missing in the SACK information, and to resend the missing data packet.
In one embodiment, the adding the SACK information into the TCP response message to obtain a new TCP response message includes:
and adding SACK information suffixes into the TCP response message to obtain a new TCP response message.
In one embodiment, the method further comprises:
receiving uplink data sent by UE;
determining whether the uplink data is an alternative TCP response message or not according to the data size of the uplink data;
analyzing the alternative TCP response message according to a preset transmission protocol to obtain a response number of the alternative TCP response message;
and recording the response number of the alternative TCP response message.
In one embodiment, the obtaining of the TCP response packet, which is newly sent by the UE and corresponds to the downlink data, includes:
determining a newly recorded target response number according to the size of the recorded response number of the TCP response message;
and determining the alternative TCP response message corresponding to the target response number as the TCP response message newly sent by the UE.
In one embodiment, before performing packet loss detection on the downlink data to be transmitted, the method further includes:
monitoring whether an operation of active packet loss exists in a packet data convergence protocol PDCP layer of a base station;
and if so, performing packet loss detection on the downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
In one embodiment, the sending the new TCP response packet to the server includes:
and repeatedly sending the new TCP response message to the server by adopting the preset repeated sending times.
A method of data transmission, said method comprising:
receiving a new TCP response message sent by a base station; the new TCP response message is obtained by the base station through packet loss detection of downlink data to be sent, acquiring the identifier of a missing data packet in the downlink data to be sent, and establishing according to the identifier of the missing data packet and the TCP response message after acquiring the transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data;
and based on the new TCP response message, retransmitting the missing data packet to the base station.
A data transmission apparatus, said apparatus comprising:
the detection module is used for detecting packet loss of the downlink data to be sent and acquiring the identifier of the missing data packet in the downlink data to be sent;
the device comprises an acquisition module, a Transmission Control Protocol (TCP) response message sending by User Equipment (UE) latest and corresponding to downlink data, and a sending module, wherein the acquisition module is used for acquiring the TCP response message sent by the UE latest and corresponding to the downlink data;
the building module is used for building a new TCP response message according to the identification of the missing data packet and the TCP response message and sending the new TCP response message to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
A data transmission apparatus, said apparatus comprising:
the receiving module is used for receiving a new TCP response message sent by the base station; the new TCP response message is obtained by the base station through packet loss detection of downlink data to be sent, acquiring the identifier of a missing data packet in the downlink data to be sent, and establishing according to the identifier of the missing data packet and the TCP response message after acquiring the transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data;
and the sending module is used for resending the missing data packet to the base station based on the new TCP response message.
A base station comprising a receiver, a transmitter, a memory and a processor, the memory storing a computer program;
the processor is used for executing a computer program to detect packet loss of downlink data to be transmitted and acquire an identifier of a missing data packet in the downlink data to be transmitted;
the receiver is used for receiving a Transmission Control Protocol (TCP) response message newly sent by the UE under the control of the processor;
the processor is also used for establishing a new TCP response message according to the identification of the missing data packet and the TCP response message;
the sender is used for sending the new TCP response message to the server under the control of the processor; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned data transmission method.
According to the data transmission method, the data transmission device, the base station and the storage medium, the base station performs packet loss detection on the downlink data to be transmitted to obtain the identifier of the missing data packet in the downlink data to be transmitted; then, a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to the downlink data is obtained; according to the missing data packet identification and the TCP response message, a new TCP response message is established and sent to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet. Because the base station carries out packet loss detection on the downlink data to be sent, the packet loss condition in the downlink data can be sensed in advance at the base station side, and the identification of the missing data packet in the downlink data is obtained; further, the base station acquires a TCP response message which is newly sent by the UE and corresponds to the downlink data, and creates a new TCP response message to send to the server on the basis of the TCP response message, so that the base station can trigger the server to resend the lost data packet in the process of sending the downlink data instead of triggering the server to resend the data packet after the UE receives the downlink data and detects the loss of the data packet, the flow time of resending the data packet by the server is shortened, and the transmission efficiency of the downlink data is improved.
Drawings
FIG. 1 is a diagram of an exemplary data transmission method;
FIG. 2 is a flow diagram illustrating a method for data transmission according to one embodiment;
FIG. 3 is a flow diagram illustrating a method for data transmission according to one embodiment;
FIG. 3A is a diagram illustrating a data transmission method according to an embodiment;
FIG. 4 is a flow chart illustrating a data transmission method according to another embodiment;
FIG. 5 is a flow chart illustrating a data transmission method according to another embodiment;
FIG. 6 is a block diagram showing the structure of a data transmission apparatus according to an embodiment;
FIG. 7 is a block diagram showing the structure of a data transmission apparatus according to an embodiment;
FIG. 8 is a block diagram showing the structure of a data transmission apparatus according to an embodiment;
FIG. 9 is a block diagram showing the structure of a data transmission apparatus according to an embodiment;
FIG. 10 is a block diagram showing the structure of a data transmission apparatus according to an embodiment;
fig. 11 is an internal structural diagram of a base station in one embodiment.
Fig. 12 is an internal configuration diagram of a server in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The data transmission method provided by the present application can be applied to the application environment shown in fig. 1, in which the base station 100 is in communication connection with the user equipment 200 and in communication connection with the server 300. The user device 200 may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, portable wearable devices, and the like. The Base Station may be, but not limited to, a macro Base Station, a micro Base Station, a small Base Station, and other types of Base Station devices, and may be a Base Station (BTS) in Global System for Mobile communication (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or eNodeB) in LTE, a relay Station or Access point, a Base Station in a future 5G network, a Customer Premise Equipment (CPE), and the like, and is not limited herein. The server 300 may be implemented by a stand-alone server or a server cluster composed of a plurality of servers.
In an embodiment, as shown in fig. 2, a data transmission method is provided, which is described by taking the application of the method to the base station in fig. 1 as an example, and includes:
s101, performing packet loss detection on downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
The downlink data may be downlink service data sent by the base station to the UE, and the downlink data may be image data, video data, text data, or the like, which is not limited herein. The downlink data may be composed of a plurality of data packets, and each of the plurality of data packets has a unique identifier. The identifier of the data packet may be used to identify an arrangement order of the data packet, and may also identify a data type carried in the data packet, which is not limited herein.
The base station may perform packet loss detection on the downlink data to be transmitted, and acquire an identifier of a missing data packet in the downlink data to be transmitted. Specifically, the base station may perform packet loss detection according to the data amount of the downlink data, or perform packet loss detection according to the identifier of the data packet of the downlink data, which is not limited herein. The downlink data to be sent can carry a data quantity value of the downlink data, the base station can detect the data quantity of the current downlink data, and when the size of the current downlink data is smaller than the data quantity value carried in the downlink data, the base station can determine that packet loss occurs in the downlink data to be sent; the base station can also determine whether the identification of the data packet in the current downlink data is continuous according to the arrangement sequence of the identification of the data packet, and if the identification of the data packet is discontinuous, the base station can determine that packet loss occurs in the downlink data; the packet loss detection method is not limited herein. After detecting that packet loss occurs in the downlink data, the base station may obtain an identifier of a missing data packet in the downlink data.
The base station may actively perform packet loss detection on the downlink data, may also perform packet loss detection on the downlink data according to a preset detection period, and may also perform packet loss detection on the downlink data after receiving the detection instruction, where the trigger condition for packet loss detection of the downlink data is not limited. Optionally, the base station may monitor whether an operation of active packet loss exists in a packet data convergence protocol PDCP layer of the base station; and if so, performing packet loss detection on the downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
S102, a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to downlink data is obtained.
After detecting that a packet loss occurs in downlink data, the base station may determine a UE corresponding to the downlink data, and then obtain a Transmission Control Protocol (TCP) response packet sent by the UE. The TCP response packet may carry an identifier of a data packet requested to be sent from the UE to the base station; for example, after receiving the data packet a, the UE sends the identifier of the next data packet after the data packet a to the base station through the TCP response message, so that the base station can send the next data packet to the UE after receiving the TCP response message.
The base station can monitor the TCP response message sent by the UE according to the type identifier carried by the TCP response message; the base station may also determine whether the TCP response packet is included in the uplink data received from the UE, and the manner of acquiring the TCP response packet is not limited herein.
The base station acquires the TCP response message newly sent by the UE, so that repeated sending of the data packet received by the UE can be avoided. The base station can immediately acquire a TCP response message of the UE after detecting that packet loss occurs in the downlink data, and determine the TCP response message as a latest TCP response message; or, the base station may also obtain a plurality of TCP response messages sent by the UE, and determine which TCP response message is the TCP response message that is newly sent by the UE according to the sending time of each TCP response message or the identifier of the data packet carried in the TCP response message.
S103, establishing a new TCP response message according to the lost data packet identifier and the TCP response message, and sending the new TCP response message to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
After the base station acquires the TCP response packet newly transmitted by the UE, a new TCP response packet may be constructed based on the TCP response packet. Specifically, the base station may add an identifier of the new data packet to the TCP response packet to form a new TCP response packet; alternatively, the base station may also determine the identifier of the data packet that is not missing according to the identifier of the missing data packet, and add the identifier of the data packet that is not missing to the TCP response message.
Further, the base station may send a new TCP response packet to the server, so that the server may determine the identifier of the missing data packet according to a packet loss occurring in the new TCP response packet or the downlink data, and further send the missing data packet to the base station, so that the base station may send the missing data packet to the UE.
The server may retransmit all data packets after the data packet requested by the UE in the TCP response message to the base station according to the new TCP response message, or may determine a missing data packet in the downlink data according to the new TCP response message, and retransmit the missing data packet.
Optionally, the base station may repeatedly send the new TCP response packet to the server by using a preset number of times of repeated sending; for example, the base station may transmit a new TCP response message 3 times in succession.
In the data transmission method, the base station performs packet loss detection on the downlink data to be transmitted to acquire the identifier of the missing data packet in the downlink data to be transmitted; then, a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to the downlink data is obtained; according to the missing data packet identification and the TCP response message, a new TCP response message is established and sent to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet. Because the base station carries out packet loss detection on the downlink data to be sent, the packet loss condition in the downlink data can be sensed in advance at the base station side, and the identification of the missing data packet in the downlink data is obtained; further, the base station acquires a TCP response message which is newly sent by the UE and corresponds to the downlink data, and creates a new TCP response message to send to the server on the basis of the TCP response message, so that the base station can trigger the server to resend the lost data packet in the process of sending the downlink data instead of triggering the server to resend the data packet after the UE receives the downlink data and detects the loss of the data packet, the flow time of resending the data packet by the server is shortened, and the transmission efficiency of the downlink data is improved.
Fig. 3 is a schematic flow chart of a data transmission method in another embodiment, which relates to an implementation manner of a base station to construct a new TCP response packet in this embodiment, where on the basis of the foregoing embodiment, an identifier of a data packet is a TCP sequence number of the data packet, as shown in fig. 3, the foregoing S103 includes:
s201, determining selective acknowledgement SACK information according to a TCP sequence number of a missing data packet; the SACK information includes TCP sequence numbers of data packets that are not missing in the downlink data to be transmitted.
The identifier of the data packet may be a TCP sequence number, and the TCP sequence number of the data packet may represent an arrangement order of the data packet. For example, the TCP sequence numbers of consecutive packets may be TCP-SN 100, TCP-SN 200, … … TCP-SN 800, etc. The base station can determine which data packets are missing according to the TCP serial numbers of all the data packets in the downlink data; the missing data packet may be actively lost by the base station in the PDCP layer operation process, or may be lost in the downlink data transmission process. For example, when active packet loss occurs in the PDCP layer operation process, the data packet TCP-SN of the downlink data is discarded at 200; after the base station detects the packet loss of the downlink data packet, the data packet missing from the downlink data packet further comprises a TCP-SN (transmission control protocol-SN) of 200, a TCP-SN of 300 and the like.
The base station may determine Selective ACK (SACK) information according to the TCP sequence number of the missing data packet. The SACK information is used to inform the server which data packets are lost, so that the server can only send the missing data packets.
The base station may obtain the TCP sequence number of the data packet that is not missing according to the TCP sequence number of the missing data packet, and then add the sequence number of the data packet that is not missing in the SACK information.
S202, adding SACK information into a TCP response message to obtain a new TCP response message; the new TCP response message is specifically used to instruct the server to determine the TCP sequence number of the missing data packet based on the TCP sequence number of the data packet that is not missing in the SACK information, and to resend the missing data packet.
Further, the base station may add the SACK information into a TCP response message newly sent by the UE to construct a new TCP response message. The base station can add SACK information into a preset field in a TCP response message; optionally, the base station may add a SACK message suffix to the TCP response message to obtain a new TCP response message.
After receiving the new TCP response packet, the server may determine whether the new TCP response packet includes the SACK information, and if the new TCP response packet includes the SACK information, the server may determine the TCP sequence number of the missing data packet according to the new TCP response packet, and resend the missing data packet. If the TCP response message received by the server does not include the SACK information, the server may retransmit all the data packets following the TCP sequence number of the data packet requested by the UE in the TCP response message.
Taking fig. 3A as an example, after the base station detects the packet loss of the downlink data, the TCP sequence numbers of the missing data packets are TCP-SN 200 to TCP-SN 500, and the data packets that are not missing are TCP-SN 600 to TCP-SN 800. After the base station detects that the downlink data is lost, the TCP serial number in the TCP response message TCP ACK newly sent by the UE is 100: 100, that is, the current UE requests the base station for a data packet of 100: 100. The SACK information that the base station can confirm is SACK: 600-.
After receiving the new TCP response message, the server can determine that the data packets from TCP-SN 600-TCP to TCP-SN 800 are not lost, so that the TCP-SN 200-TCP-SN 500 is sent to the base station, and the base station sends each data packet to the UE after acquiring the lost data packets.
According to the data transmission method, the base station adds SACK information in the TCP response message sent by the UE, so that the server can retransmit the missing data packet, the missing data packet and all the subsequent data packets are prevented from being retransmitted completely, the size of the retransmitted data packet is reduced, and the transmission efficiency of downlink data is improved.
Fig. 4 is a schematic flow chart of a data transmission method in another embodiment, which relates to a process of a base station acquiring a TCP response packet in this embodiment, and on the basis of the foregoing embodiment, as shown in fig. 4, the foregoing method further includes:
s301, receiving uplink data sent by the UE.
S302, determining whether the uplink data is the alternative TCP response message according to the data size of the uplink data.
Before acquiring the TCP response packet, the base station may receive uplink data sent by the UE. In general, the data size of the TCP response packet is small, and the base station may determine whether the uplink data is the alternative TCP response packet according to the data size of the uplink data and a preset data size threshold. For example, if the data amount of the uplink data is smaller than the preset data amount threshold, the base station may consider the uplink data as a response message, and may use the response message as an alternative TCP response message.
S303, analyzing the alternative TCP response message according to a preset transmission protocol to obtain a response number of the alternative TCP response message.
Further, the base station may parse the alternative TCP response packet, for example, obtain a response number of the alternative TCP response packet according to the TCP protocol. The response numbers represent the sequence of the TCP response messages sent by the UE. For example, the acknowledgement number of the first TCP acknowledgement message sent by the UE is TCP1, and the acknowledgement number of the second TCP acknowledgement message is TCP 2.
And S304, recording the response number of the alternative TCP response message.
The base station may record the response number of the TCP response packet received from the UE.
Further, when the base station detects that the downlink data packet is lost, and needs to acquire the TCP response packet newly sent by the UE, the base station may determine the target response number that is newly recorded according to the size of the response number of the recorded TCP response packet; and then, determining the alternative TCP response message corresponding to the target response number as the TCP response message which is newly sent by the UE.
According to the data transmission method, the base station records the response number of the TCP response message sent by the UE, and can quickly obtain the latest TCP response message sent by reading the recorded response number under the condition that the latest TCP response message is required to be obtained, so that the obtaining time of the TCP response message is shortened, and the transmission efficiency of downlink data is further improved.
In one embodiment, there is provided a data transmission method, as shown in fig. 5, applied to the server in fig. 1, the method including:
s401, receiving a new TCP response message sent by a base station; and the new TCP response message is obtained by the base station by performing packet loss detection on downlink data to be sent, acquiring the identifier of the missing data packet in the downlink data to be sent, and after acquiring the transmission control protocol TCP response message which is newly sent by the user equipment UE and corresponds to the downlink data, establishing the new TCP response message according to the identifier of the missing data packet and the TCP response message.
S402, based on the new TCP response message, the missing data packet is sent to the base station again.
The data transmission method is applied to the server side, and the implementation principle and technical effect thereof are similar to those of the above embodiments, and are not described herein again.
It should be understood that although the various steps in the flow charts of fig. 2-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 6, there is provided a data transmission apparatus including:
the detecting module 110 is configured to perform packet loss detection on downlink data to be sent, and acquire an identifier of a missing data packet in the downlink data to be sent.
The obtaining module 120 is configured to obtain a TCP response packet, which is newly sent by the UE and corresponds to the downlink data.
The building module 130 is configured to build a new TCP response packet according to the identifier of the missing data packet and the TCP response packet, and send the new TCP response packet to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
The data transmission device provided above can implement the data transmission method embodiments described above, and the implementation principle and technical effect are similar, and are not described herein again.
In one embodiment, on the basis of the above embodiment, the identifier of the data packet is a TCP sequence number of the data packet; as shown in fig. 7, the building module 130 includes:
a determining unit 131, configured to determine selective acknowledgement SACK information according to a TCP sequence number of a missing data packet; SACK information comprises TCP serial numbers of data packets which are not lost in downlink data to be sent;
an obtaining unit 132, configured to add the SACK information into the TCP response message to obtain a new TCP response message; the new TCP response message is specifically used to instruct the server to determine the TCP sequence number of the missing data packet based on the TCP sequence number of the data packet that is not missing in the SACK information, and to resend the missing data packet.
In an embodiment, on the basis of the foregoing embodiment, the obtaining unit 132 is specifically configured to: and adding SACK information suffixes into the TCP response message to obtain a new TCP response message.
In an embodiment, on the basis of the above embodiment, as shown in fig. 8, the apparatus further includes a recording module 140 configured to: receiving uplink data sent by UE; determining whether the uplink data is an alternative TCP response message or not according to the data size of the uplink data; analyzing the alternative TCP response message according to a preset transmission protocol to obtain a response number of the alternative TCP response message; and recording the response number of the alternative TCP response message.
In an embodiment, on the basis of the foregoing embodiment, the obtaining module 120 is specifically configured to: determining a target response number which is recorded latest according to the size of the response number of the recorded TCP response message; and determining the alternative TCP response message corresponding to the target response number as the TCP response message newly sent by the UE.
In an embodiment, on the basis of the above embodiment, as shown in fig. 9, the apparatus further includes a monitoring module 150 for: monitoring whether an operation of active packet loss exists in a packet data convergence protocol PDCP layer of a base station; and when the PDCP layer has active packet loss, executing packet loss detection on the downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
In an embodiment, on the basis of the above embodiment, the building module 130 is specifically configured to: and repeatedly sending the new TCP response message to the server by adopting the preset repeated sending times.
The data transmission device provided above can implement the data transmission method embodiments described above, and the implementation principle and technical effect are similar, and are not described herein again.
In one embodiment, as shown in fig. 10, there is provided a data transmission apparatus including:
a receiving module 210, configured to receive a new TCP response packet sent by a base station; the new TCP response message is obtained by the base station through packet loss detection of downlink data to be sent, acquiring the identifier of a missing data packet in the downlink data to be sent, and establishing according to the identifier of the missing data packet and the TCP response message after acquiring the transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data;
a sending module 220, configured to resend the missing data packet to the base station based on the new TCP response packet.
The data transmission device provided above can implement the data transmission method embodiments described above, and the implementation principle and technical effect are similar, and are not described herein again.
For specific limitations of the data transmission device, reference may be made to the above limitations of the data transmission method, which are not described herein again. The modules in the data transmission device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a base station is provided, the internal structure of which may be as shown in fig. 11. The base station includes a transmitter, a receiver, a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the base station is configured to provide computational and control capabilities. The memory of the base station comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the base station is used for storing data transmission data. The network interface of the base station is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a data transmission method.
In one embodiment, a server is provided, the internal structure of which may be as shown in fig. 12. The server includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the server is configured to provide computing and control capabilities. The memory of the server comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the server is used for storing data transmission data. The network interface of the server is used for communicating with an external terminal through network connection. The computer program is executed by a processor to implement a data transmission method.
It will be appreciated by those skilled in the art that the configurations shown in fig. 11-12 are only block diagrams of some of the configurations relevant to the present disclosure, and do not constitute a limitation on the computing devices to which the present disclosure may be applied, and that a particular computing device may include more or less components than shown, or combine certain components, or have a different arrangement of components.
In one embodiment, there is provided a base station comprising a transmitter, a receiver, a memory, and a processor, the memory having stored therein a computer program,
the processor is used for executing a computer program to detect packet loss of downlink data to be transmitted and acquire an identifier of a missing data packet in the downlink data to be transmitted;
the receiver is used for receiving a Transmission Control Protocol (TCP) response message newly sent by the UE under the control of the processor;
the processor is also used for establishing a new TCP response message according to the identification of the missing data packet and the TCP response message;
the sender is used for sending the new TCP response message to the server under the control of the processor; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
In one embodiment, the identification of the packet is the TCP sequence number of the packet; the processor, when executing the computer program, further performs the steps of: determining selective acknowledgement SACK information according to the TCP sequence number of the missing data packet; SACK information comprises TCP serial numbers of data packets which are not lost in downlink data to be sent; adding SACK information into a TCP response message to obtain a new TCP response message; the new TCP response message is specifically used to instruct the server to determine the TCP sequence number of the missing data packet based on the TCP sequence number of the data packet that is not missing in the SACK information, and to resend the missing data packet.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and adding SACK information suffixes into the TCP response message to obtain a new TCP response message.
In one embodiment, the processor, when executing the computer program, further performs the steps of: receiving uplink data sent by UE; determining whether the uplink data is an alternative TCP response message or not according to the data size of the uplink data; analyzing the alternative TCP response message according to a preset transmission protocol to obtain a response number of the alternative TCP response message; and recording the response number of the alternative TCP response message.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining a target response number which is recorded latest according to the size of the response number of the recorded TCP response message; and determining the alternative TCP response message corresponding to the target response number as the TCP response message newly sent by the UE.
In one embodiment, the processor, when executing the computer program, further performs the steps of: monitoring whether an operation of active packet loss exists in a packet data convergence protocol PDCP layer of a base station; and if so, performing packet loss detection on the downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and repeatedly sending the new TCP response message to the server by adopting the preset repeated sending times.
The implementation principle and technical effect of the base station provided in this embodiment are similar to those of the above method embodiments, and are not described herein again.
In one embodiment, there is provided a server comprising a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program implementing the steps of:
receiving a new TCP response message sent by a base station; the new TCP response message is obtained by the base station through packet loss detection of downlink data to be sent, acquiring the identifier of a missing data packet in the downlink data to be sent, and establishing according to the identifier of the missing data packet and the TCP response message after acquiring the transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data;
and based on the new TCP response message, retransmitting the missing data packet to the base station.
The implementation principle and technical effect of the server provided in this embodiment are similar to those of the method embodiments described above, and are not described herein again.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
performing packet loss detection on downlink data to be transmitted, and acquiring an identifier of a missing data packet in the downlink data to be transmitted;
acquiring a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to downlink data;
according to the missing data packet identification and the TCP response message, a new TCP response message is established and sent to the server; the new TCP acknowledgement message is used to instruct the server to resend the missing data packet.
In one embodiment, the identification of the packet is the TCP sequence number of the packet; the computer program when executed by the processor further realizes the steps of: determining selective acknowledgement SACK information according to the TCP sequence number of the missing data packet; SACK information comprises TCP serial numbers of data packets which are not lost in downlink data to be sent; adding SACK information into a TCP response message to obtain a new TCP response message; the new TCP response message is specifically used to instruct the server to determine the TCP sequence number of the missing data packet based on the TCP sequence number of the data packet that is not missing in the SACK information, and to resend the missing data packet.
In one embodiment, the computer program when executed by the processor further performs the steps of: and adding SACK information suffixes into the TCP response message to obtain a new TCP response message.
In one embodiment, the computer program when executed by the processor further performs the steps of: receiving uplink data sent by UE; determining whether the uplink data is an alternative TCP response message or not according to the data size of the uplink data; analyzing the alternative TCP response message according to a preset transmission protocol to obtain a response number of the alternative TCP response message; and recording the response number of the alternative TCP response message.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining a target response number which is recorded latest according to the size of the response number of the recorded TCP response message; and determining the alternative TCP response message corresponding to the target response number as the TCP response message newly sent by the UE.
In one embodiment, the computer program when executed by the processor further performs the steps of: monitoring whether an operation of active packet loss exists in a packet data convergence protocol PDCP layer of a base station; and if so, performing packet loss detection on the downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
In one embodiment, the computer program when executed by the processor further performs the steps of: and repeatedly sending the new TCP response message to the server by adopting the preset repeated sending times.
In one embodiment, the computer program when executed by the processor further performs the steps of: receiving a new TCP response message sent by a base station; the new TCP response message is obtained by the base station through packet loss detection of downlink data to be sent, acquiring the identifier of a missing data packet in the downlink data to be sent, and establishing according to the identifier of the missing data packet and the TCP response message after acquiring the transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data; and based on the new TCP response message, retransmitting the missing data packet to the base station.
The computer storage medium provided in this embodiment has similar implementation principles and technical effects to those of the above method embodiments, and is not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. A method of data transmission, the method comprising:
performing packet loss detection on downlink data to be transmitted, and acquiring an identifier of a missing data packet in the downlink data to be transmitted;
acquiring a Transmission Control Protocol (TCP) response message which is newly sent by User Equipment (UE) and corresponds to the downlink data;
according to the identification of the missing data packet and the TCP response message, a new TCP response message is established and sent to a server; and the new TCP response message is used for indicating the server to resend the missing data packet.
2. The data transmission method according to claim 1, wherein the identification of the data packet is a TCP sequence number of the data packet; and the new TCP response message is established according to the identification of the missing data packet and the TCP response message, and the method comprises the following steps:
according to the TCP sequence number of the missing data packet, determining selective acknowledgement SACK information; the SACK information comprises TCP serial numbers of data packets which are not missing in the downlink data to be sent;
adding the SACK information into the TCP response message to obtain a new TCP response message; the new TCP response packet is specifically configured to instruct the server to determine the TCP sequence number of the missing data packet based on the TCP sequence number of the data packet that is not missing in the SACK information, and to resend the missing data packet.
3. The data transmission method according to claim 2, wherein the adding the SACK information into the TCP response message to obtain a new TCP response message includes:
and adding the SACK information suffix into the TCP response message to obtain the new TCP response message.
4. A method for data transmission according to any one of claims 1-3, characterized in that the method further comprises:
receiving uplink data sent by the UE;
determining whether the uplink data is an alternative TCP response message or not according to the data size of the uplink data;
analyzing the alternative TCP response message according to a preset transmission protocol to obtain a response number of the alternative TCP response message;
and recording the response number of the alternative TCP response message.
5. The data transmission method according to any one of claims 1 to 3, wherein the obtaining of the transmission control protocol TCP response packet that is newly sent by the UE and corresponds to the downlink data includes:
determining a target response number which is recorded latest according to the size of the response number of the recorded TCP response message;
and determining the alternative TCP response message corresponding to the target response number as the TCP response message which is newly sent by the UE.
6. The data transmission method according to any one of claims 1 to 3, wherein before performing packet loss detection on the downlink data to be transmitted, the method further includes:
monitoring whether an operation of active packet loss exists in a packet data convergence protocol PDCP layer of a base station;
and if so, executing packet loss detection on the downlink data to be sent, and acquiring the identifier of the missing data packet in the downlink data to be sent.
7. The data transmission method according to any one of claims 1 to 3, wherein the sending the new TCP response message to a server includes:
and repeatedly sending the new TCP response message to the server by adopting preset repeated sending times.
8. A method of data transmission, the method comprising:
receiving a new TCP response message sent by a base station; the new TCP response message is obtained by the base station by performing packet loss detection on downlink data to be sent, acquiring an identifier of a missing data packet in the downlink data to be sent, and after acquiring a transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data, establishing the new TCP response message according to the identifier of the missing data packet and the TCP response message;
and retransmitting the missing data packet to the base station based on the new TCP response message.
9. A data transmission apparatus, characterized in that the apparatus comprises:
the detection module is used for carrying out packet loss detection on the downlink data to be sent and acquiring the identifier of the missing data packet in the downlink data to be sent;
an obtaining module, configured to obtain a TCP response packet that is newly sent by a UE and corresponds to the downlink data;
the building module is used for building a new TCP response message according to the identification of the missing data packet and the TCP response message and sending the new TCP response message to a server; and the new TCP response message is used for indicating the server to resend the missing data packet.
10. A data transmission apparatus, characterized in that the apparatus comprises:
the receiving module is used for receiving a new TCP response message sent by the base station; the new TCP response message is obtained by the base station by performing packet loss detection on downlink data to be sent, acquiring an identifier of a missing data packet in the downlink data to be sent, and after acquiring a transmission control protocol TCP response message which is newly sent by User Equipment (UE) and corresponds to the downlink data, establishing the new TCP response message according to the identifier of the missing data packet and the TCP response message;
and the sending module is used for resending the missing data packet to the base station based on the new TCP response message.
11. A base station comprising a receiver, a transmitter, a memory and a processor, the memory storing a computer program;
the processor is configured to execute the computer program to perform packet loss detection on downlink data to be transmitted, and acquire an identifier of a missing data packet in the downlink data to be transmitted;
the receiver is configured to receive, under control of the processor, a TCP response packet that is newly sent by the UE;
the processor is further configured to create a new TCP response packet according to the identifier of the missing data packet and the TCP response packet;
the sender is used for sending the new TCP response message to a server under the control of the processor; and the new TCP response message is used for indicating the server to resend the missing data packet.
12. The base station according to claim 11, characterized in that the processor, when executing the computer program, further performs the steps of the method according to any of claims 2 to 7.
13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.
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