WO2017107148A1 - 一种数据传输方法及网络侧设备 - Google Patents

一种数据传输方法及网络侧设备 Download PDF

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Publication number
WO2017107148A1
WO2017107148A1 PCT/CN2015/098764 CN2015098764W WO2017107148A1 WO 2017107148 A1 WO2017107148 A1 WO 2017107148A1 CN 2015098764 W CN2015098764 W CN 2015098764W WO 2017107148 A1 WO2017107148 A1 WO 2017107148A1
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WO
WIPO (PCT)
Prior art keywords
network side
side device
tcp
information
user equipment
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PCT/CN2015/098764
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English (en)
French (fr)
Inventor
刘会平
黄敏
庞伶俐
郑潇潇
毕皓
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15911147.5A priority Critical patent/EP3383092A4/en
Priority to PCT/CN2015/098764 priority patent/WO2017107148A1/zh
Priority to CN201580085503.6A priority patent/CN108432287A/zh
Priority to KR1020187021087A priority patent/KR20180096760A/ko
Publication of WO2017107148A1 publication Critical patent/WO2017107148A1/zh
Priority to US16/015,326 priority patent/US10524175B2/en

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    • 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]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • 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
    • 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
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • 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
    • H04L1/1874—Buffer management
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H04W36/0235—Buffering or recovering information during reselection by transmitting sequence numbers, e.g. SN status transfer

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data transmission method and a network side device.
  • Transmission Control Protocol is a connection-oriented, reliable, byte stream-based transport layer communication protocol widely used in the Internet and mobile networks.
  • the TCP protocol was originally designed for wired network environments.
  • the TCP protocol for wired transmission implies an assumption that packet loss is caused by network congestion, and this is not true for wireless networks, and the wireless network environment cannot be very Good to meet this assumption, coupled with the small bandwidth, large delay, and mobility of the wireless network environment, thus reducing the efficiency of TCP in the wireless network.
  • a TCP proxy mechanism is adopted, that is, a network side device is set between the user equipment (User Equipment, UE) and the server, and the TCP connection and the network between the UE and the network side device are based on the air interface wireless environment.
  • a wired-based TCP connection between the side device and the server optimizes TCP productivity in the wireless network.
  • parameters for controlling the UE to perform TCP connection with the server in the source network side device are lost, so that the destination network side device cannot maintain the TCP between the UE and the server according to these parameters. Connections, so that business continuity cannot be guaranteed.
  • the embodiment of the invention discloses a data transmission method and a network side device, which are used for ensuring continuity of services.
  • the first aspect of the embodiment of the present invention discloses a data transmission method, where the method is applied to a first network side device that performs data transmission, and includes:
  • the first network side device When the current condition satisfies the condition that the UE is switched from the cell where the first network side device is located to the cell where the second network side device is located, the first network side device sends the first information to the second network side device, where
  • the first information may include at least one of a congestion window (CWND), a slow start threshold (Ssthresh), a window expansion factor, a Receiver Window (RWND), and a TCP packet length, and the Ssthresh is a slow start state.
  • the boundary value with the congestion state is a window expansion factor carried by the synchronous SYN packet when the TCP connection is established, and the RWND is a maximum amount of data that the UE can receive, and the TCP packet length is that the first network side device can send.
  • the current condition may be a measurement result reported by the UE to the neighboring cell according to the measurement configuration sent by the first network side device, or may be determined by the first network side device without the measurement result.
  • the first information may further include an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the UE, and an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the server.
  • the server is connected to the UE by using a TCP connection, and the server and the first network side device are wired-based TCP connections.
  • the first network side device when the current condition satisfies the condition that the UE is switched from the cell where the first network side device is located to the cell where the second network side device is located, the first network side device may first start from the UE or the The second network side device acquires capability information of the second network side device, and when the capability information indicates that the second network side device has a TCP proxy function, the first network side device sends the second network side device to the second network The side device sends the first information.
  • the first network side device may send, to the second network side device, the first information carried by the second network side device.
  • the cached data may also directly send the first information to the second network side device.
  • the first network side device may first receive the UE or the a request sent by the second network side device to instruct the first network side device to send the first information to the second network side device, and then send the first information to the second network side device according to the request .
  • a second aspect of the embodiments of the present invention discloses a network side device, including a processor, a memory, and a communication interface.
  • the memory is used to store a set of program codes
  • the processor is configured to execute program code stored in the memory
  • the communication interface is configured to communicate with the target network side device and the UE under the control of the processor.
  • the processor executes the program code stored in the memory
  • the processor can control the communication interface to perform the method disclosed in the first aspect of the embodiments of the present invention.
  • a third aspect of the embodiments of the present invention discloses a network side device, where the network side device includes a unit The method disclosed in the first aspect of the embodiments of the present invention can be performed.
  • a fourth aspect of the embodiments of the present invention discloses a network side device readable storage medium, where the network side device storage medium stores program code for performing the method disclosed in the first aspect of the embodiment of the present invention.
  • the source network side device when the current condition satisfies the condition that the UE is switched from the cell where the source network side device is located to the cell where the source network side device is located, the source network side device sends a TCP connection between the UE and the server to the destination network side device.
  • the first information to ensure continuity of business.
  • 1 is a network architecture of data transmission disclosed in an embodiment of the present invention
  • FIG. 2 is a flowchart of a data transmission method according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of a network side device according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of another network side device disclosed in an embodiment of the present invention.
  • the embodiment of the invention discloses a data transmission method and a network side device, which are used for ensuring continuity of services. The details are described below separately.
  • FIG. 1 is a network architecture of data transmission disclosed in an embodiment of the present invention.
  • the network architecture of the data transmission method includes a UE 101 and a first network side device.
  • the backup device 102, the second network side device 103, and the server 104, the UE 101 and the first network side device 102 are based on the TCP connection in the air interface wireless environment, and the UE 101 is in the coverage area of the cell where the first network side device 102 is located, the first The network side device 102 and the server 104 are wired-based TCP connections, the server 104 transmits data to the first network side device 102 through a wired-based TCP connection, and the first network-side device 102 passes the data transmitted by the server 104 through the air-based wireless interface.
  • the TCP connection in the environment is sent to the UE 101.
  • the first network side device 102 has a TCP proxy function, and maintains a parameter for controlling the TCP connection between the UE 101 and the server 104.
  • the first network side device 102 sends its maintained parameters to the second network side device 103, so that the second network side device 103 uses these parameters to maintain the TCP between the UE 101 and the server 104.
  • the connection can ensure the continuity of the service when the UE 101 is in the cell handover.
  • the first network side device 102 and the second network side device 103 may be a base station, a core network node, etc., and the UE 101 may be a UE in a wireless communication system, that is, various types of terminals, sensors, machine type devices, and the like.
  • the TCP proxy is also known as TCP performance enhancement. It can process TCP packets in the Radio Access Network (RAN) through split acknowledgment (ACK), duplicate DupACK, local retransmission, and uplink/downlink packet sequencing. The function of optimizing processing.
  • the network side device parses and additionally processes the TCP/IP packet, and adopts TCP performance optimization technologies such as downlink data buffer sorting, split ACK, copy DupACK, and network side device local transmission and retransmission, and accelerates the slowness of the server in the downlink data transmission process.
  • TCP performance optimization technologies such as downlink data buffer sorting, split ACK, copy DupACK, and network side device local transmission and retransmission, and accelerates the slowness of the server in the downlink data transmission process.
  • the startup and fast retransmission and recovery process can avoid the slow start process caused by partial timeout, and reduce the impact of network side equipment delay and delay jitter, packet loss, core network packet loss, and out-of-order on TCP data transmission performance.
  • the TCP proxy functions of the network side device include: split ACK monitoring, split ACK, copy DupACK, local send and retransmit, and sort the packets. among them:
  • the network side device estimates the change of the CWND of the server, and determines whether to split the ACK through the window.
  • the ACK split monitoring is implemented by maintaining the variables CWND and Ssthresh in the network side device, and is consistent with the CWND and Ssthresh on the server side.
  • the congestion of the congestion window is accelerated by increasing the ACK number. This allows the congestion window of the sender of the network side device to grow to a larger value in a short time.
  • the congestion window can be quickly expanded by splitting the ACK; when the server is in fast retransmission and congestion avoidance, the congestion window can also accelerate the growth of the congestion window.
  • the network side device receives the ACK request 2921, the split ACK number is 3, and the ACK sent from the network side device is the ACK request 2918, the ACK request 2919, the ACK request 2920, and the ACK request 2921, which can speed up the rapid increase of the CWND. Conducive to the growth of the congestion window at the sender.
  • the server quickly retransmits the lost packet when it receives 3 DupACKs. After receiving the ACK sent by the UE, if the network-side device detects that the ACK request packet is not in the cache, it assumes that the requested packet may be transmitting. If it is lost, it immediately copies 3 DupACKs to the server, thereby shortening the time taken for packet retransmission and improving the overall TCP data transmission performance.
  • the data packet sent by the server is first cached in the network side device, and then sent by the network side device to the UE.
  • the network side device discovers the air interface packet loss according to the received ACK sent by the UE, it first performs local retransmission to the UE instead of retransmitting through the server, thereby shortening the retransmission time and additionally avoiding the heavy weight. Pass the halving operation of the server congestion window.
  • Sorting the uplink data packets so that the uploaded data is delivered to the core network in order.
  • the possibility of out-of-order TCP packets is small, so that the receiving end sends unnecessary DupACK to a large extent.
  • the UE sends the data packet 1 and the packet 2, because the air interface generates the error code, the packet 2 will first arrive at the server, so that the server will send DupACK and request the packet 1, so that the UE enters the fast retransmission phase, and the congestion window CWND is reduced.
  • Half after the network side device, when the packet 2 arrives at the TPE When you first enter the cache, wait until packet 1 is reached, and then send packet 1 and packet 2 to the server.
  • FIG. 2 is a flowchart of a data transmission method according to an embodiment of the present invention.
  • the data transmission method shown in FIG. 2 is described from the perspective of the first network side device 102.
  • the data transmission method may include the following steps.
  • the first network side device acquires a current condition.
  • the first network side device may obtain the current condition in real time or periodically, and the current condition may be the measurement result reported by the UE to the neighboring cell according to the measurement configuration delivered by the first network side device, or may be the first A network side device does not require measurement results to determine itself.
  • the first network side device sends the first information to the second network side device when the current condition meets the condition that the UE is switched from the cell where the first network side device is located to the cell where the second network side device is located.
  • the first network side device when the current condition satisfies the condition that the UE is switched from the cell where the first network side device is located to the cell where the second network side device is located, the first network side device sends the second network side device to control the UE and the server.
  • the first information of the TCP connection may include at least one of a CWND, a slow start threshold (Ssthresh), a window enlargement factor, an RWND, and a TCP packet length.
  • the CWND in the first network side device needs to be consistent with the CWND in the server, and the initial value of the CWND is set to two maximum packet sizes (MSS), and the MSS is the first network side device sending end.
  • MSS maximum packet sizes
  • the data received by the first network-side device from the TCP sender is already in the first network-side device cache. If the data sent by the TCP sender has been acknowledged before, the first network side device considers that the TCP sender has entered the slow start state. In the slow start phase, the first network side device returns an ACK to the TCP sender, CWND.
  • the TCP sender enters the congestion avoidance phase, and the first network side device adds an ACK to the TCP sender, and the CWND increases the MSS*MSS/CWND+MSS/8 size. If the first network side device receives the ACK of the UE, the ACK request packet is not in the first network side device cache, and the first network side device receives the packet behind it, then the TCP is considered to be sent.
  • the stage of fast retransmit provided ssthresh Set to max ⁇ CWND/2, 2*MSS ⁇ , CWND is set to max ⁇ CWND/2, 2*MSS ⁇ , then the first network side device returns a DupACK for each TCP sender, CWND adds an MSS size until ACK
  • the request is reported in the TCP proxy cache, the fast retransmission ends, and the CWND is set to Ssthresh to enter the congestion avoidance phase.
  • the Ssthresh value of the first network side device must be consistent with the slow start threshold ssthresh value of the server.
  • the Ssthresh value is set to the cache size of the first network side device, which is consistent with the initial Ssthresh of the server.
  • Ssthresh is set to max ⁇ CWND/2, 2*MSS ⁇ .
  • the window expansion factor in the first network side device is a window expansion factor carried in the option of synchronizing the SYN packet when the TCP connection is established.
  • the RWND maintained in the first network side device is the size of the UE receiving window and is in the uplink ACK packet sent by the UE.
  • the variable MSS in the first network side device refers to the length of the TCP packet transmitted by the TCP sender, which is negotiated during the three-way handshake of the initial TCP connection establishment.
  • the first information may further include an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the UE, and an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the server, which are used to indicate the UE and the server.
  • TCP connection information may further include an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the server, which are used to indicate the UE and the server.
  • the first network side device when the current condition satisfies the condition that the UE is switched from the cell where the first network side device is located to the cell where the second network side device is located, and the cached data that needs to be sent to the UE exists in the first network side device,
  • the first network side device also needs to send the cached data to the second network side device, and the first network side device may send the cached data and the first information to the second network side device respectively, or may carry the first information in the cache.
  • the data is sent to the second network side device.
  • the first network side device may obtain the first network side device from the UE or the second network side device.
  • the capability information of the second network side device when the capability information of the second network side device indicates that the second network side device has the TCP proxy function, the first network side device sends the first information to the second network side device.
  • the first network side device when the current condition satisfies the condition that the UE is switched from the cell where the first network side device is located to the cell where the second network side device is located, the first network side device receives the UE or After the second network side device sends a request for the first network side device to send the first information to the second network side device, the first network side device performs the sending of the first information to the second network side device according to the request. .
  • the first network side device may send the first information to the second network side device by using the X2 interface; if there is no wired interface between the first network side device and the second network side device, the first network side device may pass The S1 interface sends the first information to the second network side device.
  • the source network side device when the current condition satisfies the condition that the UE is switched from the cell where the source network side device is located to the cell where the destination network side device is located, the source network side device sends the control network to the destination network side device to control the UE and The first information of the TCP connection between the servers in order to ensure the continuity of the service.
  • FIG. 3 is a structural diagram of a network side device according to an embodiment of the present invention.
  • the network side device 300 may include:
  • the communication unit is configured to: when the current condition meets the condition that the UE is switched from the cell where the source network side device is located to the cell where the target network side device is located, send the first information to the target network side device, where the first information may include a congestion window CWND, a slow start At least one of a threshold, a window expansion factor, a receiving window RWND, and a TCP packet length, the source network side device, that is, the network side device 300;
  • the slow start threshold is the boundary value between the slow start state and the congestion state
  • the window expansion factor is a window expansion factor carried by the synchronous SYN packet when the TCP connection is established;
  • RWND is the maximum amount of data that the UE can receive
  • the TCP packet length is the length of the largest TCP packet that the source network side device can transmit.
  • the first information may further include an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the UE, and an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the server.
  • the communication unit is further configured to acquire the target network side device from the UE or the target network side device. Capability information, when the capability information indicates the target network side When the TCP proxy function is available, the sending of the first information to the target network side device is performed.
  • the communication unit is configured to: when the cached data that needs to be sent to the UE exists in the source network side device, send the cached data that carries the first information to the target network side device.
  • the communication unit is further configured to receive, by the UE or the target network side device, a request for indicating that the source network side device sends the first information to the target network side device, and perform the Sending the first information to the target network side device.
  • the source network side device when the current condition satisfies the condition that the UE is switched from the cell where the source network side device is located to the cell where the destination network side device is located, the source network side device sends the control network to the destination network side device for controlling the UE and The first information of the TCP connection between the servers in order to ensure the continuity of the service.
  • FIG. 4 is a structural diagram of another network side device according to an embodiment of the present invention. As shown in FIG. 4, a processor 401, a memory 402, and a communication interface 403 are included, wherein:
  • a set of program codes is stored in the memory 402, and the processor 401 is configured to call the program code control communication interface 403 stored in the memory 402 to perform the following operations:
  • the first information is sent to the target network side device, where the first information may include a congestion window CWND, a slow start threshold, and a window expansion factor.
  • the first information may include a congestion window CWND, a slow start threshold, and a window expansion factor.
  • the slow start threshold is the boundary value between the slow start state and the congestion state
  • the window expansion factor is a window expansion factor carried by the synchronous SYN packet when the TCP connection is established;
  • RWND is the maximum amount of data that the UE can receive
  • the TCP packet length is the length of the largest TCP packet that the source network side device can transmit.
  • the first information may further include an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the UE, and an IP address, a TCP port, a TCP sequence number, and a TCP ACK number of the server.
  • the processor 401 is further configured to invoke the program code control communication interface 403 stored in the memory 402. Do the following:
  • the capability information of the target network side device is obtained from the UE or the target network side device.
  • the capability information indicates that the target network side device has the TCP proxy function
  • the sending the first information to the target network side device is performed.
  • the manner in which the processor 401 controls the communication interface 403 to send the first information to the target network side device is specifically:
  • the cached data carrying the first information is sent to the target network side device.
  • the processor 401 is further configured to invoke the program code control communication interface 403 stored in the memory 402. Do the following:
  • the source network side device when the current condition satisfies the condition that the UE is switched from the cell where the source network side device is located to the cell where the destination network side device is located, the source network side device sends the control network to the destination network side device for controlling the UE and The first information of the TCP connection between the servers in order to ensure the continuity of the service.
  • the embodiment of the present invention further discloses a network side device readable storage medium, where the network side device readable storage medium stores program code, when the program code in the network side device readable storage medium is read
  • the network side device can complete all the steps of the data transmission method disclosed in the embodiment of the present invention.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, read-only memory (Read-Only Memory, ROM), random access memory (RAM), disk or optical disc.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明是实施例公开一种数据传输方法及网络侧设备，该数据传输方法包括：当当前条件满足用户设备由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，第一网络侧设备向第二网络侧设备发送第一信息，第一信息包括拥塞窗口CWND、慢启动阈值、窗口扩大因子、接收窗口RWND、传输控制协议TCP分组长度中的至少一种；慢启动阈值是慢启动状态与拥塞状态的分界值；窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子；RWND是用户设备能够接收的最大数据量；TCP分组长度是第一网络侧设备能够发送的最大TCP分组的长度。实施本发明实施例，可以保证业务的连续性。

Description

一种数据传输方法及网络侧设备 技术领域
本发明涉及通信技术领域，尤其涉及一种数据传输方法及网络侧设备。
背景技术
传输控制协议(Transmission Control Protocol，TCP)是一种面向连接的、可靠的、基于字节流的传输层通信协议，其广泛运用于因特网(Internet)和移动网络。TCP协议最初是为有线网络环境条件下设计的，用于有线传输的TCP协议隐含了一个假设：分组丢失都是由网络拥塞引起的，而这一点对于无线网络不成立，而无线网络环境不能很好的满足该假设，加上无线网络环境的小带宽，大时延，可移动性等特点，以致降低了TCP在无线网络中的工作效率。
为了解决上述问题，采用TCP代理机制，即在用户设备(User Equipment，UE)与服务器之间设置一个网络侧设备，并使UE与网络侧设备之间是基于空口无线环境下的TCP连接且网络侧设备与服务器之间是基于有线的TCP连接，对无线网络中的TCP工作效率进行优化。然而，当UE从一个小区移动到另一个小区时，源网络侧设备中用于控制UE与服务器进行TCP连接的参数将丢失，以致目的网络侧设备无法根据这些参数维护UE与服务器之间的TCP连接，从而无法保证业务的连续性。
发明内容
本发明实施例公开了一种数据传输方法及网络侧设备，用于保证业务的连续性。
本发明实施例第一方面公开一种数据传输方法，所述方法应用于进行数据传输的第一网络侧设备，包括：
当当前条件满足UE由所述第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，所述第一网络侧设备向所述第二网络侧设备发送第一信息，所述第一信息可以包括拥塞窗口(Congestion Window，CWND)、慢启动阈值(Ssthresh)、窗口扩大因子、接收窗口(Receiver Window，RWND)、TCP分组长度中的至少一种，所述Ssthresh是慢启动状态与拥塞状态的分界值， 所述窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子，所述RWND是所述UE能够接收的最大数据量，所述TCP分组长度是所述第一网络侧设备能够发送的最大TCP分组的长度，所述UE是与所述第一网络侧设备通过无线网络通信的UE中的任一UE。其中，所述当前条件可以为所述UE根据所述第一网络侧设备下发的测量配置对邻小区测量后上报的测量结果，也可以是第一网络侧设备不需要测量结果自己决定的。
在一个实施例中，所述第一信息还可以包括所述UE的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号，所述服务器与所述UE之间通过TCP连接，所述服务器与所述第一网络侧设备之间是基于有线的TCP连接。
在一个实施例中，当当前条件满足UE由所述第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，所述第一网络侧设备可以先从所述UE或者所述第二网络侧设备获取所述第二网络侧设备的能力信息，当所述能力信息指示所述第二网络侧设备具有TCP代理功能时，所述第一网络侧设备才向所述第二网络侧设备发送第一信息。
在一个实施例中，当所述第一网络侧设备中存在需要发送给所述UE的缓存数据时，所述第一网络侧设备可以向所述第二网络侧设备发送携带有第一信息的所述缓存数据，也可以直接向所述第二网络侧设备发送所述第一信息。
在一个实施例中，当当前条件满足UE由所述第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，所述第一网络侧设备可以先接收所述UE或所述第二网络侧设备发送的用于指示所述第一网络侧设备将第一信息发送给所述第二网络侧设备的请求，之后根据所述请求向所述第二网络侧设备发送第一信息。
本发明实施例第二方面公开一种网络侧设备，包括处理器、存储器和通信接口。其中，存储器用于存储一组程序代码，处理器用于执行存储器存储的程序代码，通信接口用于在处理器的控制下与目标网络侧设备和UE进行通信。当处理器执行存储器存储的程序代码时，处理器可以控制通信接口执行本发明实施例第一方面公开的方法。
本发明实施例第三方面公开了一种网络侧设备，该网络侧设备包括的单元 能够执行本发明实施例第一方面公开的方法。
本发明实施例第四方面公开一种网络侧设备可读存储介质，该网络侧设备存储介质存储了网络侧设备用于执行本发明实施例第一方面公开的方法的程序代码。
本发明实施例中，当当前条件满足UE由源网络侧设备所在小区切换至目的网络侧设备所在小区的条件时，源网络侧设备向目的网络侧设备发送用于控制UE与服务器之间TCP连接的第一信息，以便保证业务的连续性。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例公开的一种数据传输的网络架构；
图2是本发明实施例公开的一种数据传输方法的流程图；
图3是本发明实施例公开的一种网络侧设备的结构图；
图4是本发明实施例公开的另一种网络侧设备的结构图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例公开了一种数据传输方法及网络侧设备，用于保证业务的连续性。以下分别进行详细说明。
为了更好地理解本发明实施例公开的数据传输方法，先对本发明实施例的应用场景进行介绍。请参阅图1，图1是本发明实施例公开的一种数据传输的网络架构。如图1所示，该数据传输方法的网络架构包括UE101、第一网络侧设 备102、第二网络侧设备103和服务器104，UE101与第一网络侧设备102之间是基于空口无线环境下的TCP连接，且UE101处于第一网络侧设备102所在小区覆盖范围内，第一网络侧设备102与服务器104之间是基于有线的TCP连接，服务器104通过基于有线的TCP连接向第一网络侧设备102发送数据，第一网络侧设备102将服务器104发送的数据通过基于空口无线环境下的TCP连接发送给UE101。第一网络侧设备102具有TCP代理功能，维护有用于控制UE101与服务器104的进行TCP连接的参数，当UE101从第一网络侧设备102所在小区需要切换至第二网络侧设备103所在小区时，如果第二网络侧设备具有TCP代理功能，则第一网络侧设备102将其维护的参数发送给第二网络侧设备103，以便第二网络侧设备103利用这些参数维护UE101与服务器104间的TCP连接，可以保证UE101的小区切换时业务的连续性。其中，第一网络侧设备102和第二网络侧设备103可以为基站、核心网节点等，UE101可以为无线通信系统中的UE，即各种类型的终端、传感器、机器类设备等。TCP代理又称为TCP性能增强，可以通过分裂确认(Acknowledgment，ACK)、复制DupACK、本地重传、上/下行数据包排序等处理在无线接入网(Radio Access Network，RAN)中对TCP包进行优化处理的功能。
网络侧设备对TCP/IP包进行解析和额外的处理，采用下行数据缓存排序、分裂ACK、复制DupACK以及网络侧设备本地发送和重传等TCP性能优化技术，加速下行数传过程中服务器的慢启动与快速重传、恢复过程，可以避免部分超时引起的慢启动过程，以及减轻网络侧设备时延过大和时延抖动、丢包、核心网丢包、乱序等对TCP数据传输性能的影响，同时通过对递交方式的特别处理和TCP通告窗口的改变，减弱了RLC递交方式配置对UE接收窗口大小等的影响，提升了TCP数据传输效率和数据业务吞吐率。网络侧设备的TCP代理功能包括：分裂ACK监控、分裂ACK、复制DupACK、本地发送和重传和对数据包排序。其中：
1、分裂ACK监控
网络侧设备估计服务器的CWND的变化情况，并通过该窗口来确定是否分裂ACK。实现ACK分裂监控的原因如下：收到ACK，服务器能发包的多少为min{CWND，UE接收窗口大小}-flightsize，flightsize是服务器已经发送出去但 还没有得到确认的数据包，如果CWND>＝UE接收窗口大小，增加CWND就没有用了，因为此时min{CWND，UE接收窗口大小}等于UE接收窗口大小，而且flightsize最大不会超过UE接收窗口大小。ACK分裂监控主要是通过在网络侧设备中维护变量CWND、Ssthresh来实现的，并时刻保持与服务器侧的CWND，Ssthresh一致。
2、分裂ACK
根据TCP机制中按照收到的ACK数来更新拥塞窗口的特点，通过增加ACK数来加速拥塞窗口的膨胀。这使得网络侧设备发送端的拥塞窗口能短时间内增长到较大值。当服务器慢启动时，通过分裂ACK可以快速膨胀拥塞窗口；而当服务器处于快速重传和拥塞避免时，通过分裂ACK同样能够加速拥塞窗口的增长。比如，网络侧设备收到ACK请求2921，分裂ACK数为3，从网络侧设备发出的ACK就为ACK请求2918，ACK请求2919，ACK请求2920，ACK请求2921，这样可以加快CWND的快速增加，利于发送端拥塞窗口的增长。
3、复制DupACK
利用TCP机制中服务器收到3个DupACK就快速重传丢失分组的特点，网络侧设备在收到UE发送的ACK后，如果检测到ACK请求的包不在缓存中，便假定请求的包可能在传输中丢失，就立即复制3个DupACK给服务器，从而缩短分组重传所花费的时间，整体上提升了TCP数据传输性能。
4、本地发送和重传
服务器发送的数据包，首先在网络侧设备中缓存，再由网络侧设备发送给UE。当网络侧设备根据收到的UE发送的ACK发现空口丢包时，首先向UE进行本地重传，而不是通过服务器来重传，从而缩短了重传时间，另外也较大程度避免了快速重传中服务器拥塞窗口的减半操作。
5、对数据包排序
对上行数据包进行排序，使得上传的数据按序向核心网递交，到达服务器接收端后，TCP数据包乱序的可能性就很小，从而很大程度地避免了接收端发送不必要的DupACK。例如：UE发出数据包包1和包2，由于空口产生误码，会导致包2先到达服务器，使得服务器会发DupACK，请求包1，这样会使UE进入快速重传阶段，拥塞窗口CWND减半，有网络侧设备后，当包2到达TPE 时，首先进入缓存，等到包1到后，再将包1和包2发送给服务器。
基于图1所示的数据传输的网络架构，请参阅图2，图2是本发明实施例公开的一种数据传输方法的流程图。其中，图2所示的数据传输方法是从第一网络侧设备102的角度来描述。如图2所示，该数据传输方法可以包括以下步骤。
201、第一网络侧设备获取当前条件。
本实施例中，第一网络侧设备可以实时或周期性的获取当前条件，当前条件可以是UE根据第一网络侧设备下发的测量配置对邻小区测量后上报的测量结果，也可以是第一网络侧设备不需要测量结果自己决定的。
202、当当前条件满足UE由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，第一网络侧设备向第二网络侧设备发送第一信息。
本实施例中，当当前条件满足UE由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，第一网络侧设备向第二网络侧设备发送用于控制UE与服务器间TCP连接的第一信息，第一信息可以包括CWND、慢启动阈值(Ssthresh)、窗口扩大因子、RWND、TCP分组长度中的至少一种。
本实施例中，第一网络侧设备中的CWND需要与服务器中的CWND保持一致，CWND初始值设置为2个最大分组大小(Max Segment Size，MSS)，MSS是第一网络侧设备发送端所能发送的最大TCP分组报文的长度，这个和服务器端初始的CWND设置为2个MSS大小保持一致，如果第一网络侧设备从TCP发送端接收到的数据在第一网络侧设备缓存中已经存在，或者TCP发送端发送的数据之前已经得到确认，则第一网络侧设备认为TCP发送端已经进入慢启动状态，在慢启动阶段，第一网络侧设备每给TCP发送端回一个ACK，CWND就增加一个MSS大小，当CWND大于或等于Ssthresh时，TCP发送端进入拥塞避免阶段，第一网络侧设备每给TCP发送端回一个ACK，CWND就增加MSS*MSS/CWND+MSS/8大小，如果第一网络侧设备收到UE的ACK后，ACK请求的包不在第一网络侧设备缓存中且第一网络侧设备收到了它后面的包，则认为TCP发送端进入快速重传阶段，在快速重传阶段，Ssthresh设 置为max{CWND/2,2*MSS}，CWND设置为max{CWND/2,2*MSS}，然后第一网络侧设备每给TCP发送端回一个DupACK，CWND增加一个MSS大小，直到ACK的请求报在TCP代理缓存中，快速重传结束，CWND设置为Ssthresh，进入拥塞避免阶段。第一网络侧设备中的Ssthresh值需要与服务器的慢启动门限ssthresh值保持一致，初始TCP连接时，Ssthresh值设置为第一网络侧设备的缓存大小，和初始时服务器的Ssthresh保持一致，在慢启动阶段，Ssthresh设置为max{CWND/2,2*MSS}。第一网络侧设备中的窗口扩大因子是在TCP连接建立时的同步SYN包的选项中携带的窗口扩大因子。第一网络侧设备中维护的RWND是UE接收窗口的大小，是在UE发送的上行ACK包中。第一网络侧设备中的变量MSS指的是TCP发送端最大发送的TCP分组的长度，该值是在初始TCP连接建立的三次握手过程中协商得到的。
本实施例中，第一信息还可以包括UE的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号，用于表示UE与服务器间的TCP连接信息。
作为一种可能的实施方式，当当前条件满足UE由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件，且第一网络侧设备中存在需要发送给UE的缓存数据时，第一网络侧设备还需要将这些缓存数据发送给第二网络侧设备，第一网络侧设备可以将缓存数据和第一信息分别发送给第二网络侧设备，也可以将第一信息携带在缓存数据中发送给第二网络侧设备。
作为一种可能的实施方式，当当前条件满足UE由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，第一网络侧设备可以先从UE或者第二网络侧设备获取第二网络侧设备的能力信息，当第二网络侧设备的能力信息指示第二网络侧设备具有TCP代理功能时，第一网络侧设备才向第二网络侧设备发送第一信息。
作为一种可能的实施方式，当当前条件满足UE由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，第一网络侧设备在接收到UE或 第二网络侧设备发送的用于指示第一网络侧设备将第一信息发送给第二网络侧设备的请求之后，第一网络侧设备才根据该请求执行向第二网络侧设备发送第一信息。
作为一种可能的实施方式，当当前条件满足UE由第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，如果第一网络侧设备与第二网络侧设备之间存在有线接口，则第一网络侧设备可以通过X2接口向第二网络侧设备发送第一信息；如果第一网络侧设备与第二网络侧设备之间不存在有线接口，则第一网络侧设备可以通过S1接口向第二网络侧设备发送第一信息。
在图2所描述的数据传输方法中，当当前条件满足UE由源网络侧设备所在小区切换至目的网络侧设备所在小区的条件时，源网络侧设备向目的网络侧设备发送用于控制UE与服务器之间TCP连接的第一信息，以便保证业务的连续性。
请参阅图3，图3是本发明实施例公开的一种网络侧设备的结构图。如图3所示，该网络侧设备300可以包括：
通信单元，用于当当前条件满足UE由源网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，向目标网络侧设备发送第一信息，第一信息可以包括拥塞窗口CWND、慢启动阈值、窗口扩大因子、接收窗口RWND、TCP分组长度中的至少一种，源网络侧设备即网络侧设备300；
慢启动阈值是慢启动状态与拥塞状态的分界值；
窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子；
RWND是UE能够接收的最大数据量；
TCP分组长度是源网络侧设备能够发送的最大TCP分组的长度。
作为一种可能的实施方式，第一信息还可以包括UE的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号。
作为一种可能的实施方式，当当前条件满足UE由源网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，通信单元，还用于从UE或者目标网络侧设备获取目标网络侧设备的能力信息，当该能力信息指示目标网络侧设 备具有TCP代理功能时，执行所述向目标网络侧设备发送第一信息。
作为一种可能的实施方式，通信单元，具体用于当源网络侧设备中存在需要发送给UE的缓存数据时，向目标网络侧设备发送携带有第一信息的缓存数据。
作为一种可能的实施方式，通信单元，还用于接收UE或目标网络侧设备发送的用于指示源网络侧设备将第一信息发送给目标网络侧设备的请求，并根据该请求执行所述向目标网络侧设备发送第一信息。
在图3所描述的网络侧设备中，当当前条件满足UE由源网络侧设备所在小区切换至目的网络侧设备所在小区的条件时，源网络侧设备向目的网络侧设备发送用于控制UE与服务器之间TCP连接的第一信息，以便保证业务的连续性。
请参阅图4，图4是本发明实施例公开的另一种网络侧设备的结构图。如图4所示，包括处理器401、存储器402和通信接口403，其中：
存储器402中存储有一组程序代码，处理器401用于调用存储器402中存储的程序代码控制通信接口403执行以下操作：
当当前条件满足UE由源网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，向目标网络侧设备发送第一信息，第一信息可以包括拥塞窗口CWND、慢启动阈值、窗口扩大因子、接收窗口RWND、TCP分组长度中的至少一种；
慢启动阈值是慢启动状态与拥塞状态的分界值；
窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子；
RWND是UE能够接收的最大数据量；
TCP分组长度是源网络侧设备能够发送的最大TCP分组的长度。
作为一种可能的实施方式，第一信息还可以包括UE的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号。
作为一种可能的实施方式，当当前条件满足UE由源网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，处理器401还用于调用存储器402中存储的程序代码控制通信接口403执行以下操作：
从UE或者目标网络侧设备获取目标网络侧设备的能力信息，当该能力信息指示目标网络侧设备具有TCP代理功能时，执行所述向目标网络侧设备发送第一信息。
作为一种可能的实施方式，处理器401控制通信接口403向目标网络侧设备发送第一信息的方式具体为：
当源网络侧设备中存在需要发送给UE的缓存数据时，向目标网络侧设备发送携带有第一信息的该缓存数据。
作为一种可能的实施方式，当当前条件满足UE由源网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，处理器401还用于调用存储器402中存储的程序代码控制通信接口403执行以下操作：
接收UE或目标网络侧设备发送的用于指示源网络侧设备将第一信息发送给目标网络侧设备的请求，根据该请求执行所述向目标网络侧设备发送第一信息。
在图4所描述的网络侧设备中，当当前条件满足UE由源网络侧设备所在小区切换至目的网络侧设备所在小区的条件时，源网络侧设备向目的网络侧设备发送用于控制UE与服务器之间TCP连接的第一信息，以便保证业务的连续性。
一个实施例中，本发明实施例进一步公开一种网络侧设备可读存储介质，该网络侧设备可读存储介质存储有程序代码，当网络侧设备可读存储介质中的程序代码被读取到网络侧设备时，能够使得网络侧设备完成本发明实施例公开的数据传输方法的全部步骤。
需要说明的是，对于前述的各个方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本发明并不受所描述的动作顺序的限制，因为依据本发明，某一些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本发明所必须的。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：闪存盘、只读存储器(Read-Only Memory， ROM)、随机存取器(Random Access Memory，RAM)、磁盘或光盘等。
以上对本发明实施例所提供的数据传输方法及网络侧设备进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (15)

  1. 一种数据传输方法，其特征在于，所述方法应用于进行数据传输的第一网络侧设备，包括：
    当当前条件满足用户设备由所述第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，所述第一网络侧设备向所述第二网络侧设备发送第一信息，所述第一信息包括拥塞窗口CWND、慢启动阈值、窗口扩大因子、接收窗口RWND、传输控制协议TCP分组长度中的至少一种；
    所述慢启动阈值是慢启动状态与拥塞状态的分界值；
    所述窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子；
    所述RWND是所述用户设备能够接收的最大数据量；
    所述TCP分组长度是所述第一网络侧设备能够发送的最大TCP分组的长度。
  2. 根据权利要求1所述的方法，其特征在于，所述第一信息还包括所述用户设备的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号。
  3. 根据权利要求1或2所述的方法，其特征在于，当当前条件满足用户设备由所述第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，所述方法还包括：
    所述第一网络侧设备从所述用户设备或者所述第二网络侧设备获取所述第二网络侧设备的能力信息；
    当所述能力信息指示所述第二网络侧设备具有TCP代理功能时，所述第一网络侧设备执行所述向所述第二网络侧设备发送第一信息。
  4. 根据权利要求1或2所述的方法，其特征在于，所述第一网络侧设备向所述第二网络侧设备发送第一信息包括：
    当所述第一网络侧设备中存在需要发送给所述用户设备的缓存数据时，所述第一网络侧设备向所述第二网络侧设备发送携带有第一信息的所述缓存数 据。
  5. 根据权利要求1或2所述的方法，其特征在于，当当前条件满足用户设备由所述第一网络侧设备所在小区切换至第二网络侧设备所在小区的条件时，所述方法还包括：
    所述第一网络侧设备接收所述用户设备或所述第二网络侧设备发送的用于指示所述第一网络侧设备将第一信息发送给所述第二网络侧设备的请求；
    所述第一网络侧设备根据所述请求执行所述向所述第二网络侧设备发送第一信息。
  6. 一种网络侧设备，其特征在于，包括：
    通信单元，用于当当前条件满足用户设备由所述网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，向所述目标网络侧设备发送第一信息，所述第一信息包括拥塞窗口CWND、慢启动阈值、窗口扩大因子、接收窗口RWND、传输控制协议TCP分组长度中的至少一种；
    所述慢启动阈值是慢启动状态与拥塞状态的分界值；
    所述窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子；
    所述RWND是所述用户设备能够接收的最大数据量；
    所述TCP分组长度是所述网络侧设备能够发送的最大TCP分组的长度。
  7. 根据权利要求6所述的网络侧设备，其特征在于，所述第一信息还包括所述用户设备的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号。
  8. 根据权利要求6或7所述的网络侧设备，其特征在于，当当前条件满足用户设备由所述网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，所述通信单元，还用于从所述用户设备或者所述目标网络侧设备获取所述目标网络侧设备的能力信息，当所述能力信息指示所述目标网络侧设备具有TCP代理功能时，执行所述向所述目标网络侧设备发送第一信息。
  9. 根据权利要求6或7所述的网络侧设备，其特征在于，所述通信单元，具体用于当所述网络侧设备中存在需要发送给所述用户设备的缓存数据时，向所述目标网络侧设备发送携带有第一信息的所述缓存数据。
  10. 根据权利要求6或7所述的网络侧设备，其特征在于，所述通信单元，还用于接收所述用户设备或所述目标网络侧设备发送的用于指示所述网络侧设备将第一信息发送给所述目标网络侧设备的请求，并根据所述请求执行所述向所述目标网络侧设备发送第一信息。
  11. 一种网络侧设备，其特征在于，包括处理器、存储器和通信接口，其中：
    所述存储器中存储有一组程序代码，所述处理器用于调用所述存储器中存储的程序代码控制所述通信接口执行以下操作：
    当当前条件满足用户设备由所述网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，向所述目标网络侧设备发送第一信息，所述第一信息包括拥塞窗口CWND、慢启动阈值、窗口扩大因子、接收窗口RWND、传输控制协议TCP分组长度中的至少一种；
    所述慢启动阈值是慢启动状态与拥塞状态的分界值；
    所述窗口扩大因子是TCP连接建立时的同步SYN包携带的窗口扩大因子；
    所述RWND是所述用户设备能够接收的最大数据量；
    所述TCP分组长度是所述网络侧设备能够发送的最大TCP分组的长度。
  12. 根据权利要求11所述的网络侧设备，其特征在于，所述第一信息还包括所述用户设备的IP地址、TCP端口、TCP序列号和TCP ACK号，以及服务器的IP地址、TCP端口、TCP序列号和TCP ACK号。
  13. 根据权利要求11或12所述的网络侧设备，其特征在于，当当前条件满足用户设备由所述网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，所述处理器还用于调用所述存储器中存储的程序代码控制所述通信接口执 行以下操作：
    从所述用户设备或者所述目标网络侧设备获取所述目标网络侧设备的能力信息，当所述能力信息指示所述目标网络侧设备具有TCP代理功能时，执行所述向所述目标网络侧设备发送第一信息。
  14. 根据权利要求11或12所述的网络侧设备，其特征在于，所述处理器控制所述通信接口向所述目标网络侧设备发送第一信息的方式具体为：
    当所述网络侧设备中存在需要发送给所述用户设备的缓存数据时，向所述目标网络侧设备发送携带有第一信息的所述缓存数据。
  15. 根据权利要求11或12所述的网络侧设备，其特征在于，当当前条件满足用户设备由所述网络侧设备所在小区切换至目标网络侧设备所在小区的条件时，所述处理器还用于调用所述存储器中存储的程序代码控制所述通信接口执行以下操作：
    接收所述用户设备或所述目标网络侧设备发送的用于指示所述网络侧设备将第一信息发送给所述目标网络侧设备的请求，根据所述请求执行所述向所述目标网络侧设备发送第一信息。
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