WO2017173923A1 - 一种数据传输方法及装置 - Google Patents

一种数据传输方法及装置 Download PDF

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Publication number
WO2017173923A1
WO2017173923A1 PCT/CN2017/077584 CN2017077584W WO2017173923A1 WO 2017173923 A1 WO2017173923 A1 WO 2017173923A1 CN 2017077584 W CN2017077584 W CN 2017077584W WO 2017173923 A1 WO2017173923 A1 WO 2017173923A1
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Prior art keywords
link
data
delay
primary station
station
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PCT/CN2017/077584
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English (en)
French (fr)
Inventor
许建城
符子建
张劲林
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华为技术有限公司
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    • 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
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus.
  • the 3rd Generation Partnership Project (3GPP) R12 standard introduces Dual Connectivity (DC) technology, which allows user terminals to simultaneously receive from the primary station (MeNB) and secondary stations (MeNB) Secondary eNB, SeNB) data to improve user throughput.
  • DC Dual Connectivity
  • FIG. 1 it is a schematic diagram of a DC control plane connection.
  • the control plane interface (S1 for the control plane, S1-MME) of S1 terminates at the MeNB, and the MeNB and the SeNB pass the X2 control plane interface (X2-Control plane, X2-C) Interconnect.
  • the protocol supports two different user plane architectures: one is that the S1 user plane interface (S1 for the user plane, S1-U) terminates only in the MeNB, and the user plane data is used.
  • the X2-User plane (X2-U) transmits from the MeNB to the SeNB; the other is that the S1-U can be terminated at the SeNB.
  • the bearer type mainly includes a primary cell group (MCG) bearer, a secondary cell group (SCG) bearer, and a packet split bearer.
  • the S1-U terminates at the MeNB, and the SeNB does not participate in the user plane data transmission of the bearer type.
  • the SeNB is directly connected to the S-GW through the S1-U, and the MeNB does not participate in the user plane data transmission of the bearer type.
  • the S1-U terminates at the MeNB, and the Packet Data Convergence Protocol (PDCP) data is transmitted between the MeNB and the SeNB through the X2-U. Both the MeNB and the SeNB participate in user plane data transmission of this bearer type.
  • the data transmission method proposed by the invention is applicable to user plane data transmission of a Split bearer type.
  • the protocol [TS 36.425] defines an X2 user plane standard interface between the MeNB and the SeNB, that is, the SeNB uses the standard interface to feed back the SeNB direction downlink data transmission status report to the MeNB, and the report content includes the sequenced successful transmission.
  • the embodiment of the invention provides a data transmission method and device, which can distribute the data packet to the target link with the smallest expected delay to transmit, and avoid the user terminal receiving the data waiting timeout.
  • a first aspect of the present invention provides a data transmission method, including:
  • the primary station acquires N (N ⁇ 1 natural number) data packets to be transmitted from the receiving buffer;
  • the primary station calculates an expected delay of the data packet on each link of the multiple links according to the data volume of the N data packets, where the multiple links include the first link and at least one a second link, the first link is a link between the primary station and a user terminal, and the second link is a link between the primary station and the user terminal;
  • the primary station distributes the N data packets to a target link with the smallest expected delay for transmission. In this way, N data packets can be distributed to the target link with the smallest expected delay for transmission, and the user terminal is prevented from receiving data waiting timeout.
  • the method before the acquiring, by the primary station, the N data packets to be transmitted from the receiving buffer, the method further includes:
  • the primary station calculates a offload period according to the expected received data buffer size, where the offload period is that the primary station receives the downlink data transmission status report start to the expected transmission completion and the expected received data cache size matching data. The period between the end of the quantity;
  • the primary station acquires N data packets to be transmitted from the receiving buffer, including:
  • the primary station cyclically acquires N data packets to be transmitted from the receive buffer.
  • the method before the acquiring, by the primary station, the N data packets to be transmitted from the receiving buffer, the method further includes:
  • the primary station collects a total amount of data that is cumulatively transmitted to the secondary station after the start time of the offloading period;
  • the primary station acquires N data packets to be transmitted from the receive buffer.
  • the method further includes:
  • the primary station calculates an expected delay of the second link between the primary station and the secondary station;
  • the primary station acquires the M data packets to be transmitted from the receiving buffer, and distributes the M data packets to be transmitted to the first link for transmission.
  • the primary station calculates an expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets, including:
  • the primary station calculates a one-way delay of the N data packets on the first link according to the data volume of the N data packets and the air interface rate of the primary station;
  • the primary station For each of the second links, the primary station transmits a delay according to an X2 interface between the primary station and the second link corresponding secondary station, and the second link corresponds to a data packet of the secondary station. Transmission waiting delay, data amount of the N data packets And determining, by the second link, the air interface rate of the secondary station, and calculating a one-way delay of the N data packets on the second link.
  • the X2 interface transmits The delay is obtained from a downlink data transmission status report sent by the second link corresponding secondary station;
  • the X2 interface transmission delay is based on the X2 interface between the primary station and the second link corresponding secondary station.
  • the timestamp carried in the signaling in the interaction and the timestamp carried in the message sent/responded by the X2 interface are obtained.
  • the data packet transmission waiting delay is sent from the second link corresponding secondary station to the downlink data transmission state Obtained in the report; or,
  • the data packet transmission delay is a data amount according to the second link corresponding secondary station sending buffer according to the second link, a second link corresponding secondary station air interface rate, a start time of the splitting cycle, and After the start of the offloading period, the second link is obtained corresponding to the first packet distribution time of the secondary station sending buffer.
  • the primary station calculates an expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets, including:
  • the primary station calculates a loopback delay of the N data packets on the first link according to the data volume of the N data packets and the loopback rate of the primary station;
  • the primary station calculates the N data packets in the second chain according to the data amount of the N data packets and the loopback rate of the second link corresponding secondary station. Loopback delay of the road;
  • the loopback rate of the primary station is obtained by the data packet acknowledgement information included in the RLC status report of the radio link; and the loopback rate of the secondary station is transmitted by the secondary link corresponding to the secondary station.
  • the packet confirmation information contained in the status report is obtained.
  • the downlink data transmission status report includes a retransmission data packet identifier, where the method further includes:
  • the primary station acquires a retransmission data packet according to the retransmission data packet identifier
  • the primary station inserts the retransmission data packet between the N data packets according to the sequence number of the retransmitted data packet.
  • the method further includes:
  • the primary station calculates a total data transmission rate on the first link and the at least one second link in a preset period, where the preset period includes a plurality of the offloading periods;
  • the primary station determines that the primary station meets a preset quality of service QoS.
  • a second aspect of the present invention provides a data transmission apparatus, which is applied to a primary station, and includes:
  • a first acquiring module configured to acquire N (N ⁇ 1 natural number) data packets to be transmitted from the receiving buffer
  • a first calculating module configured to calculate, according to the data volume of the N data packets, an expected delay of each data packet on each link of the multiple links, where the multiple links include the first link And at least a second link, the first link is a link between the primary station and a user terminal, and the second link is between the primary station and the user terminal Link
  • a distribution module configured to distribute the N data packets to a target link with a minimum expected delay for transmission. In this way, N data packets can be distributed to the target link with the smallest expected delay for transmission, and the user terminal is prevented from receiving data waiting timeout.
  • the device further includes:
  • a receiving module configured to receive a downlink data transmission status report sent by the secondary station, where the downlink data transmission status report includes a size of the secondary station desired to receive data buffer;
  • a second calculating module configured to calculate a offloading period according to the expected received data buffer size, where the offloading period is that the primary station receives the downlink data transmission status report start to an expected transmission completion and the expected receiving data buffer The period between the end time of the size matching data amount;
  • the first acquiring module is specifically configured to cyclically acquire N data packets to be transmitted from the receiving buffer in the offloading period.
  • the apparatus further includes:
  • a statistics module configured to collect a total amount of data that is cumulatively sent to the secondary station after the start time of the offloading period
  • the first acquiring module is specifically configured to obtain N data packets to be transmitted from the receiving buffer, if the total data volume is smaller than the expected receiving data buffer size.
  • the apparatus further includes:
  • a third calculating module configured to calculate an expected delay of the second link between the primary station and the secondary station, if the total data volume is greater than or equal to the expected received data buffer size
  • a first determining module configured to determine, according to an expected delay of the second link and an expected delay of the first link, a data size M (M ⁇ 0 natural number) transmitted on the first link );
  • Obtaining a distribution module configured to acquire the M data packets to be transmitted from a receiving buffer, and distribute the M data packets to be transmitted to the first link for transmission.
  • the first feasible implementation manner of the second aspect the fourth feasible implementation manner of the second aspect
  • the expected time Extension includes one-way delay
  • the calculating, by the first calculating module, the expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets specifically includes:
  • the first calculating module calculates a one-way delay of the N data packets on the first link according to the data volume of the N data packets and the air interface rate of the primary station;
  • the first computing module For each of the second links, the first computing module transmits a delay according to an X2 interface between the primary station and the second link corresponding secondary station, and the second link corresponds to the secondary station
  • the one-way delay of the N packets on the second link is calculated by the data packet waiting delay, the data volume of the N data packets, and the air interface rate of the second link corresponding to the secondary station.
  • the X2 interface transmits The delay is obtained from a downlink data transmission status report sent by the second link corresponding secondary station;
  • the X2 interface transmission delay is based on the The timestamp carried in the signaling interaction between the primary station and the secondary station corresponding to the second link is obtained by the timestamp carried in the signaling interaction and the timestamp carried in the message that the X2 interface performs the data packet transmission/response.
  • the data packet transmission waiting delay is sent from the second link corresponding secondary station to the downlink data transmission state. Obtained in the report; or,
  • the data packet transmission delay is a data amount according to the second link corresponding secondary station sending buffer according to the second link, a second link corresponding secondary station air interface rate, a start time of the splitting cycle, and After the start of the offloading period, the second link is obtained corresponding to the first packet distribution time of the secondary station sending buffer.
  • the expected time The extension includes a loopback delay
  • the calculating, by the first calculating module, the expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets specifically includes:
  • the first calculating module calculates a loopback delay of the N data packets on the first link according to the data volume of the N data packets and the loopback rate of the primary station;
  • the first calculating module calculates the N data packets according to the data amount of the N data packets and the loopback rate of the second link corresponding secondary station. Loopback delay of the two links;
  • the loopback rate of the primary station is obtained by the data packet acknowledgement information included in the RLC status report of the radio link; and the loopback rate of the secondary station is transmitted by the secondary link corresponding to the secondary station.
  • the packet confirmation information contained in the status report is obtained.
  • the downlink data transmission status report includes a retransmission data packet identifier
  • the apparatus further includes:
  • a second acquiring module configured to obtain a retransmission data packet according to the retransmission data packet identifier
  • an inserting module configured to insert the retransmitted data packet between the N data packets according to the sequence number of the retransmitted data packet.
  • the device further includes:
  • a fourth calculating module configured to calculate a total data transmission rate on the first link and the at least one second link in a preset period, where the preset period includes a plurality of the offloading periods;
  • a determining module configured to determine whether the total data transmission rate is greater than a preset threshold
  • a second determining module configured to determine that the primary station meets a preset quality of service QoS if the total data transmission rate is greater than the preset threshold.
  • the primary station acquires N data packets to be transmitted from the receiving buffer, and calculates an expected delay of each data packet in each of the multiple links according to the data volume of the N data packets.
  • the plurality of links include a first link and a second link, the first link is a link between the primary station and the user terminal, and the second link is between the secondary station and the user terminal.
  • the link distributes the N packets to the target link with the smallest expected delay, and calculates the expected delay of each link, thereby distributing the data packet to the target link process with the smallest expected delay. Avoid user terminal receiving data waiting timeout.
  • FIG. 1 is a schematic diagram of a DC control plane connection provided by the present invention.
  • FIG. 2 is a schematic diagram of a DC user plane connection according to the present invention.
  • FIG. 3 is a schematic structural diagram of an LTE DC system according to the present invention.
  • FIG. 4 is a schematic diagram of a WIFI shunt provided by the present invention.
  • FIG. 5 is a schematic flowchart diagram of a data transmission method according to the present invention.
  • FIG. 6 is a schematic flowchart diagram of another data transmission method according to the present invention.
  • FIG. 7 is a schematic diagram of a dual connectivity data offloading architecture provided by the present invention.
  • FIG. 8 is a schematic diagram of a shunting cycle provided by the present invention.
  • FIG. 9 is a schematic diagram of a SeNB data offload receiving process according to the present invention.
  • FIG. 11 is a schematic structural diagram of a data transmission apparatus according to the present invention.
  • FIG. 12 is a schematic structural diagram of another data transmission apparatus according to the present invention.
  • the data transmission method of the embodiment of the present invention can be applied to the system architecture of FIG. 3 or FIG. 4.
  • the present invention can be applied to the offloading in the Long Term Evolution (LTE) system.
  • the MeNB obtains data from a Serving Gateway (S-GW).
  • S-GW Serving Gateway
  • the data can be divided into two sub-flows in the MeNB. One sub-flow is directly transmitted to the UE through the MeNB, and the other sub-flow is transmitted to the UE through the SeNB.
  • the embodiment of the present invention mainly describes a target link transmission process for each N data packets to be transmitted in the substream.
  • the invention can also be applied to shunting between different system formats.
  • the application scenario is as shown in the figure, the MeNB acquires data from the S-GW, and the data is divided into two substreams in the eNB, and one substream is directly transmitted to the UE through the eNB, and another A sub-flow is transmitted to the UE through a WiFi access point (AP).
  • AP WiFi access point
  • the embodiment of the present invention mainly describes a target link transmission process for each N data packets to be transmitted in the sub-flow.
  • FIG. 5 is a flowchart of a data transmission method according to an embodiment of the present invention. The method may be applied to a primary station, such as the MeNB in FIG. 3 or the eNB in FIG.
  • FIG. 5 is a flowchart of the data transmission method, and the specific steps are as follows:
  • the primary station acquires N (N ⁇ 1 natural number) data packets to be transmitted from the receiving buffer.
  • the primary station MeNB obtains N data packets to be transmitted to the UE from the receiving buffer of the primary station, where N represents the delay estimation granularity, which depends on the hardware offload processing capability. The smaller N is, the higher the requirement for hardware offload processing capability.
  • FIG. 7 is a schematic structural diagram of a MeNB according to an embodiment of the present invention. As shown in the figure, the RxBuffer_MeNB is a primary station receiving a buffer queue, and buffers a data packet sent from the S-GW.
  • the primary station calculates an expected delay of the data packet on each link of the multiple links according to the data volume of the N data packets, where the multiple links include the first link and At least one second link, the first link is a link between the primary station and a user terminal, and the second link is a chain between the secondary station and the user terminal road;
  • the primary station calculates a data packet in each of the multiple links according to the data amount of the N data packets.
  • the specific calculation method is not limited herein.
  • the multiple links include a first link and at least one second link.
  • the first link is a primary station.
  • a link between the MeNB and the user terminal UE, and the second link is a link between the secondary station MeNB and the secondary station SeNB and the user terminal UE. It should be noted that, if the secondary station SeNB includes multiple, the number of the second links includes multiple.
  • the primary station calculates an expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets. Specifically, the following steps S50-S51 are included;
  • the primary station calculates a one-way delay of the N data packets on the first link according to the data volume of the N data packets and the air interface rate of the primary station.
  • the first link is a link between the host station MeNB and the UE, as shown in FIG. 7 , which is a schematic structural diagram of a primary station MeNB according to an embodiment of the present invention.
  • the primary station includes a receive buffer queue (RxBuffer_MeNB) for buffering data packets sent from the S-GW, and a primary station transmit buffer queue (TxBuffer_MeNB) for buffering the unsubscribed RLC successfully delivered to the primary station (MeNB).
  • RxBuffer_MeNB receive buffer queue
  • TxBuffer_MeNB primary station transmit buffer queue
  • the secondary station send buffer queue TxBuffer_SeNB: used to buffer the split to the secondary station (SeNB) has not been received (via X2 port feedback)
  • the lower layer RLC of the SeNB successfully submits the data packet of the acknowledgement indication (that is, the data packet sent to the second link is buffered).
  • the primary station MeNB further includes an X2 interface feedback receiving processing module: configured to perform corresponding processing according to the received downlink data transmission status report, and output the processing result to the data offload sending and processing module as a decision basis for data offloading.
  • the secondary station SeNB includes a secondary station receiving buffer queue (RxBuffer_SeNB) for buffering the data packets of the primary station (MeNB) offloaded (transferred via the X2 port). These data packets have not been sent to the UE, or have been sent to the UE but have not yet received the Acknowledgement (ACK) frame of the UE.
  • RxBuffer_SeNB secondary station receiving buffer queue
  • the X2 interface feedback receiving processing module in the primary station MeNB extracts the information carried in the downlink data transmission status report, and the carried information is received from the MeNB in addition to the standard interface information (including but not limited to being successfully transmitted to the UE in sequence).
  • the X2 port transmission delay may also be included ( MeNB->SeNB), SeNB user air interface rate, and SeNB user data packet transmission waiting delay and other information.
  • the primary station MeNB retransmits the lost data packet according to the X2 port packet loss indication included in the downlink data transmission status report. Lost packets can be retransmitted on the first link or retransmitted on the second link.
  • the lost data packet is retransmitted on the first link, it is inserted into the transmission queue according to the sequence number of the data packet to ensure that the data packets in the transmission queue are transmitted in order.
  • the lost packet is preferentially transmitted.
  • the successfully transmitted data packet is cleared from the TxBurrer_SeNB according to the packet acknowledgement information included in the downlink data transmission status report.
  • the standard interface information carried in the downlink data transmission status report is extracted, and the amount of data that is allowed to be newly sent to the SeNB is calculated.
  • the primary station MeNB further includes a data offload sending processing module, and the MeNB determines the offloading of the data packets in the primary station receiving buffer queue RxBuffer_MeNB to different links according to the processing result output by the X2 feedback receiving processing module.
  • the module considers the user's QoS requirements at the same time.
  • the offload period indicates the time from the receipt of the downlink data transmission status report time to the time when the expected transmission completion allows the amount of data to be diverted to the SeNB.
  • the QoS guarantee period Tp indicates that the total offload rate of data diverted to the MeNB and the SeNB during this period must satisfy the user QoS requirements.
  • Fig. 8 illustrates the relationship between the shunt period Tsp and the period Tfp of the downlink data transmission status report.
  • the implementation of the downlink data transmission status report may be periodic feedback or event feedback.
  • the length of the offloading cycle depends on the hardware offload processing capability, and the length of the before and after shunt cycles can be different.
  • the length of the QoS guarantee period is variable.
  • the expected delay may include a one-way delay
  • the one-way delay calculation manner for the first link may be performed by using the following calculation manner:
  • One-way delay of the first link (the amount of data of the N packets taken out + the amount of data of the packets that have been accumulated to the MeNB after the start of the current splitting cycle + the amount of data in the TxBuffer_MeNB at the beginning of the current splitting period) ) / MeNB link air interface rate.
  • the MeNB link air interface rate is the MeNB link air interface transmission rate when the TxBuffer_MeNB is not empty.
  • the primary station transmits a delay according to an X2 interface between the primary station and the second link corresponding secondary station, and the second link corresponds to the secondary station.
  • the one-way delay of the N packets on the second link is calculated by the data packet waiting delay, the data volume of the N data packets, and the air interface rate of the second link corresponding to the secondary station.
  • the unidirectional delay calculation method for each second link may be calculated by using the information of the secondary link corresponding to the secondary station, and the specific calculation manner may adopt the following calculation manner:
  • Second link one-way delay X2 interface transmission delay (MeNB->SeNB) + SeNB packet transmission waiting delay + (data amount of N packets taken out + accumulated to SeNB after the start of this shunt period) The amount of data of the offloaded packet) / the second link air interface rate.
  • the X2 interface transmission delay may be obtained from a downlink data transmission status report sent by the second link corresponding secondary station.
  • X2 interface transmission delay of the data packet the time when the data packet is received from the X2 port - the transmission time recorded by the data packet when the MeNB is offloaded, and the secondary station smoothes the measured value, and smoothes the ⁇ filtering mechanism.
  • the X2 interface transmission delay of the data packet is obtained by the X2 feedback transmission processing module of the second link corresponding secondary station.
  • the X2 interface transmission delay (MeNB->SeNB) may also be carried in the X2 interface signaling interaction and the data packet sending/responding message.
  • the timestamp which in turn is approximated by measuring the estimated transmit/receive timestamp.
  • the specific measurement methods are as follows:
  • the initial loopback delay of the X2 is obtained based on the signaling interaction process of the X2SeNB Addition, and is calculated as follows:
  • RTTx2 (T SENB ADDITION ACKNOWLEDGE-T SENB ADDITION REQUEST); wherein, T SENB ADDITION REQUEST sends the SENB ADDITTION REQUEST message time for the MeNB, and T SENB ADDITION ACKNOWLEDGE is the time when the MeNB receives the SNB SENB ADDITTION ACKNOWLEDGE message.
  • SeNB When the offload carries the data packet and sends it to the SeNB, it is necessary to put a time stamp Tsent in each data packet.
  • SeNB After the data packet, when the DL DATA DELIVERY STATUS message packet is fed back to the MeNB, the timestamp Tsent of the data packet from the MeNB recently received by the SeNB, and the time when the SeNB sends the DL DATA DELIVERY STATUS message packet and the SeNB receive the data.
  • the information of the time difference ⁇ T of the packet is carried to the MeNB along with the DL DATA DELIVERY STATUS message.
  • the record receipt time is Treceived
  • the X2 interface loopback delay RTTx2n is calculated:
  • RTTx2n (1-a)*RTTx2n-1+a*RTTx2n;
  • the initial value of RTTx2 may take the X2 loopback delay obtained by the X2 SeNB Addition-based signaling interaction procedure when the SeNB is added.
  • a is the filter coefficient.
  • the MeNB When the data is sent to the SeNB for a period of time, the MeNB needs to actively construct and send a separate measurement packet to the SeNB, and measure the loopback delay of the X2 according to the foregoing processing manner, and the measurement result is calculated according to the foregoing processing manner. Participate in filtering.
  • the X2 port transmission delay (MeNB->SeNB) takes one-half of the X2 port loopback delay.
  • the data packet waiting delay may be calculated by the X2 feedback sending processing module of the second link corresponding secondary station, and then the X2 feedback sending processing module encapsulates the data packet transmission waiting delay into the downlink data transmission status report.
  • the X2 feedback receiving processing module fed back to the primary station performs processing.
  • the data packet waiting delay may be calculated by the following calculation method:
  • Packet Waiting Delay RxBuffer_SeNB
  • the packet is scheduled to be transmitted - the time when the packet was received from the X2 port.
  • the measured values are then smoothed and smoothed using an alpha filtering mechanism.
  • the data packet transmission waiting delay may also be approximated by the MeNB:
  • Packet transmission waiting delay (data amount of TxBuffer_SeNB at the beginning of this shunt period - MIN (data amount of TxBuffer_SeNB at the beginning of this shunt period, SeNB link air interface rate * (this shunt period start time - first packet in TxBuffer_SeNB) Splitting time))) / SeNB link air interface rate.
  • the primary station calculates an expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets. Specifically, the following steps S52 to S53 are included;
  • the primary station calculates a loopback delay of the N data packets on the first link according to the data volume of the N data packets and the loopback rate of the primary station.
  • the expected delay may be a loopback delay
  • the expected delay of each link is calculated by calculating a loopback delay of the first link and a second of each of the at least one second link. Loopback delay of the link.
  • the calculation of the loopback delay in the MeNB of the primary station may be performed by the data offload sending and processing module, and the specific calculation manner may be:
  • the first link loopback delay (the amount of data of the N packets taken out + the amount of data packets that have been accumulated to the MeNB after the start of the current splitting period) / the first link loopback rate + (this time The data amount of the TxBuffer_MeNB at the start of the shunt period - MIN (the amount of data of the TxBuffer_MeNB at the beginning of the current shunt period, the first link loopback rate * (the current shunt period start time - the first packet shunt time in the TxBuffer_MeNB))) / first Link loopback rate.
  • the first link loopback rate estimate can be estimated by the packet acknowledgement information contained in the RLC status report.
  • the specific confirmation method can be as follows:
  • Packet-based acknowledgment delay measurement method measures the delay from the transmission of each packet to the receipt of an acknowledgment frame. In addition to the delay of the packet size, the instantaneous delay of the data packet is obtained, and the instantaneous delay is smoothed to obtain an average delay per byte, and the reciprocal is the average rate. It should be noted that the smoothing process uses an alpha filtering mechanism.
  • the primary station calculates the N data packets according to the data volume of the N data packets and the loopback rate of the secondary link corresponding secondary station. Loopback delay of the two links;
  • the primary station calculates the loopback delay of the second link according to the loopback rate of the secondary link corresponding to the second link and the data volume of the N data packets. :
  • the second link loopback delay (the amount of data of the N packets taken out + the amount of data packets that have been accumulated to the SeNB after the start of the current splitting period) / the second link loopback rate + (this time The data amount of the TxBuffer_SeNB at the start of the shunt cycle - MIN (the amount of data of the TxBuffer_SeNB at the beginning of the current splitting period, the second link loopback rate * (the current splitting period start time - the first packet shunting time in the TxBuffer_SeNB))) / second Link loopback rate.
  • the second link loopback rate estimation may be estimated by using the X2 port feedback receiving processing module of the primary station by using the data packet acknowledgement information included in the downlink data transmission status report.
  • the second link loopback rate estimation can adopt the following two optional implementation manners:
  • the primary station distributes the N data packets to a target link with the smallest expected delay for transmission.
  • the primary station distributes the N data packets to the target link with the smallest expected delay for transmission.
  • the target link may be the first link or the second link.
  • the expected delay includes, but is not limited to, one-way delay or loopback delay.
  • the primary station acquires N data packets to be transmitted from the receiving buffer, and calculates an expected delay of each data packet in each of the multiple links according to the data volume of the N data packets.
  • the plurality of links include a first link and a second link, the first link is a link between the primary station and the user terminal, and the second link is between the secondary station and the user terminal.
  • the link distributes the N packets to the target link with the smallest expected delay, and calculates the expected delay of each link, thereby distributing the data packet to the target link process with the smallest expected delay. Avoid user terminal receiving data waiting timeout.
  • FIG. 6 is a schematic flowchart of another data transmission method according to an embodiment of the present invention. As shown in the figure, the data transmission method includes the following steps:
  • the primary station receives a downlink data transmission status report sent by the secondary station, where the downlink data transmission status report includes a size of the secondary station expected to receive data buffer;
  • the X2 feedback sending processing module in the secondary station calculates and processes the generated downlink data transmission status report, and feeds back to the MeNB.
  • the downlink data transmission status report includes the size of the secondary station's expected received data buffer.
  • the calculation process of the secondary station SeNB for the expected received data cache size is as follows:
  • the SeNB cache data is below a certain threshold, the SeNB is triggered to calculate the expected receive data cache size. It can be understood that the data cache size can also be calculated periodically.
  • the specific process of the SeNB calculating the expected data buffer size is: calculating, according to the SeNB air interface rate and the SeNB target buffer time, the SeNB expects to receive the data buffer size.
  • the SeNB target cache time is variable.
  • the SeNB user air interface rate refers to the SeNB air interface transmission rate when the RxBuffer_SeNB is not empty.
  • the primary station calculates a offload period according to the expected received data buffer size, where the offload period is that the primary station receives the downlink data transmission status report start to an expected transmission completion and the expected received data cache size. The period between the end times of matching data quantities;
  • the primary station calculates the offload period according to the expected size of the received data buffer. As shown in FIG. 8, the offload period is matched by the primary station receiving the downlink data transmission status report to the expected transmission completion and matching the expected received data buffer size. The period between the end of the amount of data.
  • the primary station cyclically acquires N data packets to be transmitted to the user terminal from the receiving buffer, and performs shunt processing on the N data packets in each cycle, thereby determining the N data packets. Which target link the packet is transmitted on.
  • N the number of N data packets acquired in each split time slot in the offloading period may be different, that is, N may be different.
  • the primary station collects a total amount of data that is cumulatively sent to the secondary station after the start time of the offloading period.
  • the primary station collects the total amount of data accumulated and sent to the secondary station after the start time of the offloading period. For example, if the data packet is sent twice to the secondary station, and each time is N data packets, the total is The amount of data is the amount of data of 2N packets, of course, the amount of data of each packet can be inconsistent.
  • the primary station acquires N data packets to be transmitted from the receive buffer.
  • the primary station acquires N data packets to be transmitted from the receiving buffer, and updates.
  • the data that is offloaded to the MeNB and the SeNB in the current splitting period further updates the total split rate of the data that is offloaded to the MeNB and the SeNB.
  • the primary station calculates an expected delay of the data packet on each link of the multiple links according to the data volume of the N data packets, where the multiple links include the first link and At least one second link, the first link is a link between the primary station and a user terminal, and the second link is a chain between the secondary station and the user terminal road;
  • the primary station distributes the N data packets to a target link with the smallest expected delay for transmission.
  • steps S604 to S605 of the embodiment of the present invention refer to steps S501 to S502 of the embodiment of FIG. 5, and details are not described herein again.
  • the primary station calculates an expected delay of the second link between the primary station and the secondary station.
  • the primary station calculates For the current calculation method of the second link, refer to step S501 in the embodiment of FIG. 5, and details are not described herein again.
  • the primary station determines, according to an expected delay of the second link and an expected delay of the first link, a data volume size M (the natural number of M ⁇ 0) transmitted on the first link. ;
  • the primary station determines the data size M, M of the first link transmission is a natural number greater than or equal to 0 according to the expected delay of the second link and the expected delay of the first link.
  • the expected delay estimation result of all the data packets in the queue is smaller than the expected delay of the second link.
  • M is the number of all data packets in the queue.
  • the primary station acquires the M data packets to be transmitted from a receiving buffer, and distributes the M data packets to be transmitted to the first link for transmission.
  • the primary station distributes the M data packets to be transmitted obtained from the receiving buffer to the first link for transmission, and the first link is a link between the primary station and the user terminal UE.
  • the total split rate of data diverted to the MeNB and the SeNB is updated.
  • the data transmission method may further include the following steps S60-S61;
  • the primary station acquires a retransmission data packet according to the retransmitted data packet identifier.
  • the downlink data transmission status report includes a retransmission data packet identifier, and the retransmission data packet is obtained from the corresponding transmission buffer according to the retransmission data packet identifier.
  • the primary station inserts the retransmission data packet between the N data packets according to the sequence number of the retransmitted data packet.
  • the primary station obtains the sequence number of the retransmitted data packet, inserts it into the transmission queue according to the sequence number of the retransmitted data packet, and ensures that the data packets in the transmission queue are sequentially transmitted.
  • the secondary station SeNB data offload receiving processing module when the secondary station SeNB data offload receiving processing module receives the retransmitted data packet lost by the X2 port, it inserts the data packet into the transmission queue according to the serial number of the data packet, and ensures that the data packet in the transmission queue is pressed. Order transmission.
  • the secondary station SeNB when the secondary station SeNB receives the non-retransmitted data packet, it inserts the data packet into the transmission queue according to the serial number of the data packet, and ensures that the data packets in the transmission queue are transmitted in order.
  • the data transmission method of this embodiment may further include the following steps S62-S64;
  • the primary station calculates a total data transmission rate on the first link and the at least one second link in a preset period, where the preset period includes a plurality of the offloading periods;
  • the preset period may be a QoS guarantee period. As shown in FIG. 8 , the preset period includes multiple offload periods, and the first link and the at least one second link are calculated in the preset period. The total data transfer rate.
  • the primary station determines whether the total data transmission rate is greater than a preset threshold.
  • the primary station determines that the primary station meets a preset quality of service QoS.
  • the primary station determines that the primary station meets the preset quality of service QoS, and does not perform data within the preset period (that is, the QoS guarantee period of FIG. 8). Split processing.
  • the primary station acquires N data packets to be transmitted from the receiving buffer, and calculates an expected delay of each data packet in each of the multiple links according to the data volume of the N data packets.
  • the plurality of links include a first link and a second link, the first link is a link between the primary station and the user terminal, and the second link is between the secondary station and the user terminal.
  • the link distributes the N packets to the target link with the smallest expected delay, and calculates the expected delay of each link, thereby distributing the data packet to the target link process with the smallest expected delay. Avoid user terminal receiving data waiting timeout.
  • FIG. 10 is a schematic diagram of a MeNB data offload sending process according to the present invention. As shown in the figure, the method includes the following steps:
  • Step 1 If the primary station receives the buffer queue and still has data not sent, go to step 2; otherwise, the current splitting period ends.
  • Step 2 If the accumulated data volume that is offloaded to the SeNB exceeds the expected received data buffer size calculated according to the current X2 port downlink data transmission status report, go to step 3; otherwise, go to step 6.
  • Step 3 The M packets to be offloaded are taken out from the RxBuffer_MeNB queue in a FIFO manner, and the expected delay estimation result of these data packets just reaches the expected delay of the SeNB link. (When the RxBuffer_MeNB queue data is insufficient, the expected delay estimation result of all data packets in the queue will be less than the expected delay of the SeNB link, and M is the number of data packets in the queue.)
  • Step 4 Distribute the extracted M data packets to the first link.
  • Step 5 Update the total offload rate of the data diverted to the MeNB and the SeNB. This shunt cycle ends.
  • Step 6 Extract N packets to be offloaded from the RxBuffer_MeNB queue in FIFO mode.
  • N represents the delay estimation granularity, depending on the hardware offload processing capability. The smaller N is, the higher the requirement for hardware offload processing capability.
  • Step 7 Perform an expected delay estimation on the data volume of the N packets taken.
  • Step 8 According to the expected delay estimation result, the N packets obtained are distributed to the target link with the expected delay.
  • Step 9 According to the result of step 8, update the total split rate of data that is offloaded to the MeNB and the SeNB in the current offloading period.
  • Step 10 If the total split rate of the user meets the user QoS requirements, the current splitting period ends; otherwise, go to step 1.
  • FIG. 11 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention. As shown in the figure, the data transmission apparatus of this embodiment includes:
  • the first obtaining module 100 is configured to acquire N (N ⁇ 1 natural numbers) data packets to be transmitted from the receiving buffer;
  • the first calculating module 101 is configured to calculate, according to the data volume of the N data packets, an expected delay of each data packet on each link of the multiple links, where the multiple links include the first chain And a second link, the first link is a link between the primary station and a user terminal, and the second link is between the primary station and the user terminal Link
  • the expected delay includes a one-way delay
  • the calculating, by the first calculating module 101, the expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets includes:
  • the first calculating module 101 calculates a one-way delay of the N data packets on the first link according to the data volume of the N data packets and the air interface rate of the primary station;
  • the first computing module 101 For each of the second links, the first computing module 101 transmits a delay according to an X2 interface between the primary station and the second link corresponding secondary station, and the second link corresponds to the secondary station. Calculating a data packet transmission delay, a data amount of the N data packets, and an air interface rate of the second link corresponding to the secondary station, and calculating a one-way delay of the N data packets on the second link .
  • the X2 interface transmission delay is obtained from a downlink data transmission status report sent by the second link corresponding secondary station
  • the X2 interface transmission delay is based on the X2 interface between the primary station and the second link corresponding secondary station.
  • the timestamp carried in the signaling in the interaction and the timestamp carried in the message sent/responded by the X2 interface are obtained.
  • the data packet transmission waiting delay is obtained from a downlink data transmission status report sent by the second link corresponding secondary station.
  • the data packet transmission delay is a data amount according to the second link corresponding secondary station sending buffer according to the second link, a second link corresponding secondary station air interface rate, a start time of the splitting cycle, and After the start of the offloading period, the second link is obtained corresponding to the first packet distribution time of the secondary station sending buffer.
  • the expected delay includes a loopback delay
  • the calculating, by the first calculating module 101, the expected delay of each of the N data packets on each of the multiple links according to the data volume of the N data packets includes:
  • the first calculating module 101 calculates a loopback delay of the N data packets on the first link according to the data volume of the N data packets and the loopback rate of the primary station;
  • the first calculating module 101 calculates the N data packets according to the data amount of the N data packets and the loopback rate of the second link corresponding secondary station. Loopback delay of the second link;
  • the loopback rate of the primary station is obtained by the data packet acknowledgement information included in the RLC status report of the radio link; and the loopback rate of the secondary station is transmitted by the secondary link corresponding to the secondary station.
  • the packet confirmation information contained in the status report is obtained.
  • the distribution module 102 is configured to distribute the N data packets to a target link with the smallest expected delay for transmission.
  • the device further includes a receiving module 103, a second computing module 104, and a statistics module 105;
  • the receiving module 103 is configured to receive a downlink data transmission status report sent by the secondary station, where the downlink data transmission status report includes a size of the secondary station desired to receive data buffer;
  • the second calculating module 104 is configured to calculate a offload period according to the expected received data buffer size, where the offload period is that the primary station receives the downlink data transmission status report start to an expected transmission completion and the expected received data.
  • the buffer size matches the time period between the end times of the data amount;
  • the first obtaining module 100 is specifically configured to cyclically acquire N data packets to be transmitted from the receiving buffer in the offloading period.
  • the statistics module 105 is configured to collect a total amount of data that is cumulatively sent to the secondary station after the start time of the offloading period;
  • the first obtaining module 100 is specifically configured to acquire N data packets to be transmitted from the receiving buffer, if the total data volume is smaller than the expected receiving data buffer size.
  • the data transmission device may further include a third calculation module 106, a first determination module 107, and an acquisition distribution module 108;
  • the third calculating module 106 is configured to calculate an expected delay of the second link between the primary station and the secondary station, if the total data volume is greater than or equal to the expected received data buffer size;
  • a first determining module 107 configured to determine, according to an expected delay of the second link and an expected delay of the first link, a data size M (M ⁇ 0) transmitted on the first link Natural number);
  • the obtaining distribution module 108 is configured to acquire the M data packets to be transmitted from the receiving buffer, and distribute the M data packets to be transmitted to the first link for transmission.
  • the data transmission device may further include a second acquisition module 109 and an insertion module 110;
  • the second obtaining module 109 is configured to obtain a retransmission data packet according to the retransmission data packet identifier.
  • the inserting module 110 is configured to insert the retransmitted data packet between the N data packets according to the sequence number of the retransmitted data packet.
  • the apparatus may further include a fourth calculation module 111, a determination module 112, and a second determination module 113;
  • the fourth calculation module 111 is configured to calculate a total data transmission rate on the first link and the at least one second link in a preset period, where the preset period includes a plurality of the offloading periods;
  • the determining module 112 is configured to determine whether the total data transmission rate is greater than a preset threshold
  • the second determining module 113 is configured to determine that the primary station meets the preset quality of service QoS if the total data transmission rate is greater than the preset threshold.
  • the primary station acquires N data packets to be transmitted from the receiving buffer, and calculates an expected delay of each data packet in each of the multiple links according to the data volume of the N data packets.
  • the plurality of links include a first link and a second link, the first link is a link between the primary station and the user terminal, and the second link is between the secondary station and the user terminal.
  • the link distributes the N packets to the target link with the smallest expected delay, and calculates the expected delay of each link, thereby distributing the data packet to the target link process with the smallest expected delay. Avoid user terminal receiving data waiting timeout.
  • FIG. 12 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.
  • the apparatus may include: a memory 1201, a communication interface 1202, at least one processor 1203 (such as a CPU), and at least one communication bus 1204.
  • the memory 1201 may be a high speed RAM memory or a nonvolatile memory ( Non-volatile memory, such as at least one disk storage. Alternatively, the memory 1201 may be at least one storage device located away from the processor 1103. among them:
  • Communication bus 1204 is used to implement connection communication between these components.
  • a program code is stored in the memory 1201, and the processor 1203 is configured to call the program code stored in the memory 1201 for performing the following operations:
  • the multiple links include the first link and the at least one second link
  • the first link is a link between the primary station and the user terminal
  • the second link is a link between the primary station and the user terminal
  • the communication interface 1202 is configured to distribute the N data packets to a target link with a minimum expected delay for transmission.
  • the processor 1203 is configured to call the program code stored in the memory 1201, and can also be used to perform the following operations:
  • offload period is an end time when the primary station receives the downlink data transmission status report start to the expected transmission completion and the expected received data buffer size matching data amount Time period between
  • N data packets to be transmitted are cyclically acquired from the receive buffer.
  • the processor 1203 is configured to invoke the program code stored in the memory 1201, and can also be used to perform the following operations:
  • N data packets to be transmitted are obtained from the receive buffer.
  • processor 1203 is configured to invoke the program code stored in the memory 1201, and can also be used to perform the following operations:
  • the expected delay includes a one-way delay
  • the processor 1203 calculates, according to the data volume of the N data packets, an expected delay of each of the N data packets on each of the multiple links, including:
  • the processor 1203 calculates a one-way delay of the N data packets on the first link according to the data volume of the N data packets and the air interface rate of the primary station;
  • the first computing module For each of the second links, the first computing module transmits a delay according to an X2 interface between the primary station and the second link corresponding secondary station, and the second link corresponds to the secondary station
  • the one-way delay of the N packets on the second link is calculated by the data packet waiting delay, the data volume of the N data packets, and the air interface rate of the second link corresponding to the secondary station.
  • the X2 interface transmission delay is obtained from a downlink data transmission status report sent by the second link corresponding secondary station
  • the X2 interface transmission delay is based on the The timestamp carried in the signaling interaction between the primary station and the secondary station corresponding to the second link is obtained by the timestamp carried in the signaling interaction and the timestamp carried in the message that the X2 interface performs the data packet transmission/response.
  • the data packet transmission waiting delay is obtained from a downlink data transmission status report sent by the second link corresponding secondary station.
  • the data packet transmission delay is a data amount according to the second link corresponding secondary station sending buffer according to the second link, a second link corresponding secondary station air interface rate, a start time of the splitting cycle, and After the start of the offloading period, the second link is obtained corresponding to the first packet distribution time of the secondary station sending buffer.
  • the expected delay includes a loopback delay
  • the processor 1203 calculates, according to the data volume of the N data packets, an expected delay of each of the N data packets on each of the multiple links, including:
  • the loopback rate of the primary station is obtained by the data packet acknowledgement information included in the RLC status report of the radio link; and the loopback rate of the secondary station is transmitted by the secondary link corresponding to the secondary station.
  • the packet confirmation information contained in the status report is obtained.
  • the downlink data transmission status report includes a retransmission data packet identifier
  • the processor 1203 is configured to invoke the program code stored in the memory 1201, and may also be used to perform the following operations:
  • the processor 1203 is configured to invoke the program code stored in the memory 1201, and can also be used to perform the following operations:
  • the primary station acquires N data packets to be transmitted from the receiving buffer, and calculates an expected delay of each data packet in each of the multiple links according to the data volume of the N data packets.
  • the plurality of links include a first link and a second link, the first link is a link between the primary station and the user terminal, and the second link is between the secondary station and the user terminal.
  • the link distributes the N packets to the target link with the smallest expected delay, and calculates the expected delay of each link, thereby distributing the data packet to the target link process with the smallest expected delay. Avoid user terminal receiving data waiting timeout.
  • the program can be stored in a computer readable storage medium, when the program is executed
  • the flow of the method embodiments as described above may be included.
  • the foregoing storage medium includes various media that can store program codes, such as a ROM or a random access memory RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例公开了一种数据传输方法及装置，数据传输方法包括：主站从接收缓存中获取N(N≥1的自然数)个待传输的数据包；所述主站根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；所述主站将所述N个数据包分发至预期时延最小的目标链路进行传输。本发明实施例可以将数据包分发至预期时延最小的目标链路进行传输，避免用户终端接收数据等待超时。

Description

一种数据传输方法及装置 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装置。
背景技术
随着移动宽带(Mobile Brondband，MBB)时代的到来，用户对网络流量带宽的需求越来越高，期望在任意时间和地点都能享受很好的用户体验。第三代合作伙伴计划(The 3rd Generation Partnership Project，3GPP)R12标准引入了双连接(Dual Connectivity，DC)技术，用户终端可以利用该技术同时接收来自主站(Master eNB，MeNB)和辅站(Secondary eNB，SeNB)的数据，提升用户吞吐率。
如图1所示，是DC控制面连接示意图，对于DC用户，S1的控制面接口(S1for the control plane，S1-MME)终止于MeNB，MeNB和SeNB通过X2控制面接口(X2-Control plane，X2-C)互联。
如图2所示，是DC用户面连接示意图，协议支持两种不同的用户面体系结构：一种是S1用户面接口(S1for the user plane，S1-U)仅终止于MeNB，用户面数据使用X2用户面接口(X2-User plane，X2-U)从MeNB往SeNB传输；另外一种是S1-U可以终止在SeNB。
但是，不同的承载类型可以配置在不同的用户面体系结构中，用户面连接依赖于承载类型配置。承载类型主要包括主小区组(Master Cell Group，MCG)承载、辅小区组(Secondary Cell Group，SCG)承载和分组Split承载。
对于MCG承载，S1-U终止于MeNB，SeNB不参与此承载类型的用户面数据传输。
对于SCG承载，SeNB通过S1-U直接和S-GW连接，MeNB不参与此承载类型的用户面数据传输。
对于Split承载，S1-U终止于MeNB，MeNB和SeNB之间通过X2-U传输分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)数据。MeNB和SeNB都参与此承载类型的用户面数据传输。本发明提出的数据传输方法，适用于Split承载类型的用户面数据传输。
现有技术中，协议【TS 36.425】定义了MeNB和SeNB间的X2用户面标准接口，即SeNB利用该标准接口向MeNB反馈SeNB方向链路下行数据传输状态报告，报告内容包括已按序成功发送到用户终端UE的从MeNB接收到的PDCP协议数据单元(Protocol Data Unit，PDU)中的最大PDCP PDU系列号(Sequence Number，SN)、相关E-UTRAN无线接入承载(E-UTRAN Radio Access Bearer，E-RAB)的期望数据缓存大小，UE所有E-RAB总的最小期望缓存大小和X2口丢包指示，但是协议中所规定的标准接口并没有解决MeNB如何在MeNB和SeNB之间进行传输数据量的分配，数据包如何发送，这些因素对于双连接的性能具有重要的影响。
发明内容
本发明实施例提供了一种数据传输方法及装置，可以将数据包分发至预期时延最小的目标链路进行传输，避免用户终端接收数据等待超时。
本发明第一方面提供一种数据传输方法，包括：
主站从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
所述主站根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
所述主站将所述N个数据包分发至预期时延最小的目标链路进行传输。通过这种方式可以将N个数据包分发至预期时延最小的目标链路进行传输，避免用户终端接收数据等待超时。
基于第一方面，在第一方面的第一种可行的实施方式中，所述主站从接收缓存中获取N个待传输的数据包之前，还包括：
所述主站接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
所述主站根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
所述主站从接收缓存中获取N个待传输的数据包，包括：
在所述分流周期内，所述主站从接收缓存中循环获取N个待传输的数据包。
基于第一方面第一种可行的实施方式，在第一方面的第二种可行的实施方式中，所述主站从接收缓存中获取N个待传输的数据包之前，还包括：
所述主站统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
若所述总数据量小于所述期望接收数据缓存大小，所述主站从接收缓存中获取N个待传输的数据包。
基于第一方面第二种可行的实施方式，在第一方面的第三种可行的实施方式中，所述方法还包括：
若所述总数据量大于或者等于所述期望接收数据缓存大小，所述主站计算所述主站与辅站之间第二链路的预期时延；
所述主站根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
所述主站从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
基于第一方面第一种可行的实施方式～第一方面第三种可行的实施方式中任意一种可行的实施方式，在第一方面的第四种可行的实施方式中，所述预期时延包括单向时延；
所述主站根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延，包括：
所述主站根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
针对每个所述第二链路，所述主站根据所述主站与所述第二链路对应辅站之间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量 以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
基于第一方面第四种可行的实施方式，在第一方面的第五种可行的实施方式中，若所述主站与所述第二链路对应辅站之间同步，所述X2接口传输时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；
若所述主站与所述第二链路对应辅站之间异步，所述X2接口传输时延为根据在所述主站与所述第二链路对应辅站之间的X2接口进行信令交互中信令携带的时间戳以及在所述X2接口进行数据包发送/应答的消息中携带的时间戳获得。
基于第一方面第四种可行的实施方式，在第一方面的第六种可行的实施方式中，所述数据包传输等待时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；或者，
所述数据包传输等待时延为根据所述分流周期开始时所述第二链路对应辅站发送缓存的数据量、所述第二链路对应辅站空口速率、所述分流周期开始时刻以及所述分流周期开始后所述第二链路对应辅站发送缓存的首包分发时刻获得。
基于第一方面第一种可行的实施方式～第一方面第三种可行的实施方式中任意一种可行的实施方式，在第一方面的第七种可行的实施方式中，所述预期时延包括环回时延；
所述主站根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延，包括：
所述主站根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
针对每个第二链路，所述主站根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
其中，所述主站的环回速率通过无线链路控制RLC状态报告中包含的数据包确认信息获得；所述辅站的环回速率通过所述第二链路对应辅站发送的下行数据传输状态报告中包含的数据包确认信息获得。
基于第一方面，在第一方面的第八种可行的实施方式中，所述下行数据传输状态报告中包括重传数据包标识，所述方法还包括：
所述主站根据所述重传数据包标识获取重传数据包；
所述主站根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
基于第一方面，在第一方面的第九种可行的实施方式中，所述方法还包括：
所述主站计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
所述主站判断所述总的数据传输速率是否大于预设阈值；
若是，则所述主站确定所述主站满足预设服务质量QoS。
本发明第二方面提供一种数据传输装置，应用于主站，包括：
第一获取模块，用于从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
第一计算模块，用于根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
分发模块，用于将所述N个数据包分发至预期时延最小的目标链路进行传输。通过这种方式可以将N个数据包分发至预期时延最小的目标链路进行传输，避免用户终端接收数据等待超时。
基于第二方面，在第二方面的第一种可行的实施方式中，所述装置还包括：
接收模块，用于接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
第二计算模块，用于根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
所述第一获取模块具体用于在所述分流周期内，从接收缓存中循环获取N个待传输的数据包。
基于第二方面第一种可行的实施方式，在第二方面的第二种可行的实施方式中，所述装置还包括：
统计模块，用于统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
所述第一获取模块具体用于若所述总数据量小于所述期望接收数据缓存大小，从接收缓存中获取N个待传输的数据包。
基于第二方面第二种可行的实施方式，在第二方面第三种可行的实施方式中，所述装置还包括：
第三计算模块，用于若所述总数据量大于或者等于所述期望接收数据缓存大小，计算所述主站与辅站之间第二链路的预期时延；
第一确定模块，用于根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
获取分发模块，用于从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
基于第二方面第一种可行的实施方式～第二方面第三种可行的实施方式中的任意一种可行的实施方式，在第二方面的第四种可行的实施方式中，所述预期时延包括单向时延；
所述第一计算模块根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
所述第一计算模块根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
针对每个所述第二链路，所述第一计算模块根据所述主站与所述第二链路对应辅站之间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
基于第二方面第四种可行的实施方式，在第二方面的第五种可行的实施方式中，若所述主站与所述第二链路对应辅站之间同步，所述X2接口传输时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；
若所述主站与所述第二链路对应辅站之间异步，所述X2接口传输时延为根据在所述 主站与所述第二链路对应辅站之间的X2接口进行信令交互中信令携带的时间戳以及在所述X2接口进行数据包发送/应答的消息中携带的时间戳获得。
基于第二方面第四种可行的实施方式，在第二方面的第六种可行的实施方式中，所述数据包传输等待时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；或者，
所述数据包传输等待时延为根据所述分流周期开始时所述第二链路对应辅站发送缓存的数据量、所述第二链路对应辅站空口速率、所述分流周期开始时刻以及所述分流周期开始后所述第二链路对应辅站发送缓存的首包分发时刻获得。
基于第二方面第一种可行的实施方式～第二方面第三种可行的实施方式中的任意一种可行的实施方式，在第二方面的第七种可行的实施方式中，所述预期时延包括环回时延；
所述第一计算模块根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
所述第一计算模块根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
针对每个第二链路，所述第一计算模块根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
其中，所述主站的环回速率通过无线链路控制RLC状态报告中包含的数据包确认信息获得；所述辅站的环回速率通过所述第二链路对应辅站发送的下行数据传输状态报告中包含的数据包确认信息获得。
基于第二方面第一种可行的实施方式，在第二方面第八种可行的实施方式中，所述下行数据传输状态报告中包括重传数据包标识，所述装置还包括：
第二获取模块，用于根据所述重传数据包标识获取重传数据包；
插入模块，用于根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
基于第二方面第一种可行的实施方式，在第二方面第九种可行的实施方式中，所述装置还包括：
第四计算模块，用于计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
判断模块，用于判断所述总的数据传输速率是否大于预设阈值；
第二确定模块，用于若所述总的数据传输速率大于所述预设阈值，则确定所述主站满足预设服务质量QoS。
本发明实施例中，主站从接收缓存中获取N个待传输的数据包，根据N个数据包的数据量，计算数据包在多条链路中每条链路上的预期时延，该多条链路包括第一链路以及至少一第二链路，该第一链路为主站与用户终端之间的链路，该第二链路为主站经辅站与用户终端之间的链路，将N个数据包分发至预期时延最小的目标链路进行传输，通过计算各条链路的预期时延，从而将数据包分发至预期时延最小的目标链路进程传输，避免用户终端接收数据等待超时。
附图说明
为了更清楚地说明本发明实施例或背景技术中的技术方案，下面将对本发明实施例或背景技术中所需要使用的附图进行说明。
图1为本发明提供的一种DC控制面连接示意图；
图2为本发明提供的一种DC用户面连接示意图；
图3为本发明提供的一种LTE DC系统架构图；
图4为本发明提供的一种WIFI分流示意图；
图5为本发明提供的一种数据传输方法的流程示意图；
图6为本发明提供的另一种数据传输方法的流程示意图；
图7为本发明提供的一种双连接数据分流架构示意图；
图8为本发明提供的一种分流周期的示意图；
图9为本发明提供的一种SeNB数据分流接收处理示意图；
图10为本发明提供的一种数据分流处理流程图；
图11为本发明提供的一种数据传输装置的结构示意图；
图12为本发明提供的另一种数据传输装置的结构示意图。
具体实施方式
下面结合本发明实施例中的附图对本发明实施例进行描述。
本发明实施例的数据传输方法可以应用于图3或图4的系统架构中，如图3所示，本发明可以应用于长期演进(Long Term Evolution，LTE)制式系统内的分流。如图所示，MeNB从服务网关(Serving Gateway，S-GW)获取数据，数据在MeNB可以分为两个子流，一个子流直接通过MeNB传给UE，另一个子流则通过SeNB传给UE，本发明实施例主要针对子流中的每N个待传输的数据包选择目标链路传输过程进行阐述。
本发明还可应用于不同系统制式间的分流。如图4所示，例如LTE和WiFi之间的分流，应用场景如图所示，MeNB从S-GW获取数据，数据在eNB分为两个子流，一个子流直接通过eNB传给UE，另一个子流则通过WiFi无线接入点(Access Point，AP)传给UE，本发明实施例主要针对子流中的每N个待传输的数据包选择目标链路传输过程进行阐述。
请参照图5，为本发明实施例提供的一种数据传输方法的流程图，该方法可以应用于主站，例如：图3中的MeNB或者图4中的eNB。图5是该数据传输方法的流程图，具体步骤如下：
S500，主站从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
本发明实施例中，主站MeNB从主站的的接收缓存中获取N个待传输至UE的数据包，N表示时延估计粒度，取决于硬件分流处理能力。N越小，对硬件分流处理能力要求越高。如图7所示，为本发明实施例提供的一种MeNB的结构示意图，如图所示，RxBuffer_MeNB即是主站接收缓存队列，缓存来自S-GW发送过来的数据包。
S501，所述主站根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
本发明实施例中，主站根据N个数据包的数据量，计算数据包在多条链路中每条链路 上的预期时延，具体的计算方法在此不作限定，可选的，该多条链路包括第一链路以及至少一条第二链路，如图3所示，第一链路为主站MeNB与用户终端UE之间的链路，第二链路为主站MeNB经过辅站SeNB与用户终端UE之间的链路。需要说明的是，若辅站SeNB包括多个，则第二链路的数量包括多个。
可选的，若所述预期时延包括单向时延，该主站根据N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括以下步骤S50～S51；
S50，所述主站根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
本发明实施例中，第一链路为主站MeNB与UE之间的链路，如图7所示，为本发明实施例提供的一种主站MeNB的结构示意图，如图所示，该主站包括接收缓存队列(RxBuffer_MeNB)：用于缓存来自S-GW发送过来的数据包；主站发送缓存队列(TxBuffer_MeNB)：用于缓存往主站(MeNB)分流的尚未收到下层RLC成功递交确认指示的数据包(即是缓存往第一链路发送的数据包)；辅站发送缓存队列(TxBuffer_SeNB)：用于缓存往辅站(SeNB)分流的尚未收到(经X2口反馈的)SeNB下层RLC成功递交确认指示的数据包(即是缓存往第二链路发送的数据包)。
进一步，主站MeNB还包括X2口反馈接收处理模块：用于根据接收的下行数据传输状态报告进行相应处理，并把处理结果输出给数据分流发送处理模块，作为数据分流的决策依据。
如图所示，辅站SeNB包括辅站接收缓存队列(RxBuffer_SeNB)：用于缓存主站(MeNB)分流(经X2口转发)过来的数据包。这些数据包尚未往UE发送，或者已经往UE发送但尚未收到UE的确认(Acknowledgement，ACK)帧。
具体可选的，主站MeNB中的X2口反馈接收处理模块提取下行数据传输状态报告中携带的信息，携带的信息除了标准接口信息(包括但不限于已按序成功发送到UE的从MeNB接收到的PDCP PDU中的最大PDCP PDU SN、相关E-RAB的期望数据缓存大小，UE所有E-RAB总的最小期望缓存大小和X2口丢包指示)外，还可以包括X2口传输时延(MeNB->SeNB)、SeNB用户空口速率和SeNB用户数据包传输等待时延等信息。
主站MeNB根据下行数据传输状态报告中包含的X2口丢包指示，重传丢失的数据包。丢失的数据包可以在第一链路重传，也可以在第二链路重传。
若丢失的数据包在第一链路重传时，根据数据包的序号将其插入传输队列，保证传输队列中的数据包按序传输。
若丢失的数据包在第二链路重传时，优先传输丢失的数据包。
根据下行数据传输状态报告中包含的数据包确认信息，从TxBurrer_SeNB中清除已传输成功的数据包。
提取下行数据传输状态报告中携带的标准接口信息，计算允许往SeNB新发送的数据量大小。
主站MeNB还包括数据分流发送处理模块，MeNB根据X2反馈接收处理模块输出的处理结果，决定处于主站接收缓存队列RxBuffer_MeNB中的数据包到不同链路的分流。分流时，该模块同时考虑用户的QoS要求。
对于每一个Split承载，每次当MeNB收到从SeNB反馈的下行数据传输状态报告时，都开始一个新的分流周期。分流周期表示从收到下行数据传输状态报告时刻开始，到预期传输完成允许往SeNB分流的数据量的时刻为止。
QoS保证周期Tp表示在这段时间内，往MeNB和SeNB分流的数据总的分流速率必须满足用户QoS要求。图8示意了分流周期Tsp和下行数据传输状态报告的周期Tfp之间的关系。实现上，下行数据传输状态报告，可以是周期反馈，也可以是事件反馈。分流周期的时间长短取决于硬件分流处理能力，前后分流周期的时间长短可以不一样。QoS保证周期的时间长短，是可变的。
具体可选的，预期时延可以包括单向时延，对于第一链路的单向时延计算方式可以是采用下列计算方式：
第一链路的单向时延＝(取出的N个数据包的数据量+本次分流周期开始后已累计往MeNB分流的数据包的数据量+本次分流周期开始时TxBuffer_MeNB中的数据量)/MeNB链路空口速率。MeNB链路空口速率为TxBuffer_MeNB非空时的MeNB链路空口传输速率。
S51，针对每个所述第二链路，所述主站根据所述主站与所述第二链路对应辅站之间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
本发明实施例中，针对每个第二链路的单向时延计算方式可以采用该第二链路对应辅站的信息进行计算，具体的计算方式可以采用下列计算方式：
第二链路单向时延＝X2接口传输时延(MeNB->SeNB)+SeNB数据包传输等待时延+(取出的N个数据包的数据量+本次分流周期开始后已累计往SeNB分流的数据包的数据量)/第二链路空口速率。
可选的，若主站与第二链路对应辅站之间同步，则该X2接口传输时延可以从该第二链路对应辅站发送的下行数据传输状态报告中获得。
数据包的X2接口传输时延＝从X2口收到该数据包的时刻-该数据包在MeNB分流时记录的发送时刻，辅站对测量的值进行平滑，平滑采用α滤波机制。
需要说明的是，数据包的X2接口传输时延由该第二链路对应辅站的X2反馈发送处理模块计算处理得到。
可选的，若主站与第二链路对应辅站之间异步，X2接口传输时延(MeNB->SeNB)，也可以通过在X2接口信令交互和数据包发送/应答的消息中携带时间戳，进而通过测量估计发送/接收时间戳近似得到。具体的测量方式如下：
当MeNB添加SeNB时，基于X2SeNB Addition的信令交互流程获取X2的初始环回时延，按照如下方式计算：
RTTx2＝(T SENB ADDITION ACKNOWLEDGE-T SENB ADDITION REQUEST)；其中，T SENB ADDITION REQUEST为MeNB发送SENB ADDITTION REQUEST消息时刻，T SENB ADDITION ACKNOWLEDGE为MeNB收到SeNB的SENB ADDITTION ACKNOWLEDGE消息时刻。
当分流承载有数据包发给SeNB时，需要在每个数据包里打上时间戳Tsent。SeNB收 到该数据包后，在给MeNB反馈DL DATA DELIVERY STATUS消息包时，将SeNB最近接收到的来自MeNB的数据包的时间戳Tsent，以及SeNB发送DL DATA DELIVERY STATUS消息包时刻与SeNB收到这个数据包的时间差ΔT的信息在DL DATA DELIVERY STATUS消息随路带给MeNB。MeNB每次接收到DL DATA DELIVERY STATUS消息包时，记录收到时刻为Treceived，并计算X2接口环回时延RTTx2n：
RTTx2n＝T_receivedn–T_sentn–ΔT
然后再进行滤波：
RTTx2n＝(1-a)*RTTx2n-1+a*RTTx2n；
RTTx2初始值可以取添加SeNB时基于X2 SeNB Addition的信令交互流程获取的X2环回时延。a为滤波系数。
当Split承载在一段时间没有数据包发给SeNB时，MeNB需要主动构造发送一个单独的测量包发给SeNB，按照上述的处理方式测量X2的环回时延，测量结果按照上述的处理方式计算并参与滤波。
X2口传输时延(MeNB->SeNB)取X2口环回时延的二分之一。
对于数据包等待时延，可以由该第二链路对应辅站的X2反馈发送处理模块进行计算得到，进而由X2反馈发送处理模块将该数据包传输等待时延封装入下行数据传输状态报告中反馈至主站的X2反馈接收处理模块进行处理，可选的，数据包传输等待时延可以采用下列计算方式进行计算：
数据包等待时延＝RxBuffer_SeNB该数据包被调度传输时刻-从X2口收到该数据包的时刻。然后再对测量的值进行平滑，平滑采用α滤波机制。
在一些可选的实施方式中，例如辅站未反馈该数据包传输等待时延的场景，数据包传输等待时延也可以在MeNB进行估计近似得到：
数据包传输等待时延＝(本次分流周期开始时TxBuffer_SeNB的数据量-MIN(本次分流周期开始时TxBuffer_SeNB的数据量，SeNB链路空口速率*(本次分流周期开始时刻-TxBuffer_SeNB中首包分流时刻)))/SeNB链路空口速率。
可选的，若所述预期时延包括环回时延，该主站根据N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括以下步骤S52～S53；
S52，所述主站根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
本发明实施例中，预期时延可以为环回时延，计算各条链路的预期时延即是计算第一链路的环回时延和该至少一条第二链路中每条第二链路的环回时延。
主站MeNB中计算环回时延可以是由数据分流发送处理模块进行计算处理，具体的计算方式可以是：
第一链路环回时延＝(取出的N个数据包的数据量+本次分流周期开始后已累计往MeNB分流的数据包的数据量)/第一链路环回速率+(本次分流周期开始时TxBuffer_MeNB的数据量-MIN(本次分流周期开始时TxBuffer_MeNB的数据量，第一链路环回速率*(本次分流周期开始时刻-TxBuffer_MeNB中首包分流时刻)))/第一链路环回速率。
第一链路环回速率估计可以通过RLC状态报告中包含的数据包确认信息，估计得到， 具体的确认方式可以采用如下两种可选的方式：
·基于数据包确认时延测量方法：测量每个数据包从发送到收到确认帧的时延。数据包大小除时延，得到数据包的瞬时时延，将该瞬时时延平滑后，得到每字节平均时延，倒数为平均速率。需要说明的是，平滑处理采用α滤波机制。
·基于单位时间内确认数据统计测量方法：测量单位时间内，发送缓存TxBuffer_MeNB非空时间内的确认数据量。对测量的值进行平滑处理，平滑采用α滤波机制。
S53，针对每个第二链路，所述主站根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
本发明实施例中，针对每个第二链路，主站根据可以根据第二链路对应辅站的环回速率以及N个数据包的数据量计算得到该第二链路的环回时延：
第二链路环回时延＝(取出的N个数据包的数据量+本次分流周期开始后已累计往SeNB分流的数据包的数据量)/第二链路环回速率+(本次分流周期开始时TxBuffer_SeNB的数据量-MIN(本次分流周期开始时TxBuffer_SeNB的数据量，第二链路环回速率*(本次分流周期开始时刻-TxBuffer_SeNB中首包分流时刻)))/第二链路环回速率。
该第二链路环回速率估计可以采用主站的X2口反馈接收处理模块通过下行数据传输状态报告中包含的数据包确认信息，估计得到。
第二链路环回速率估计可以采用如下两种可选的实施方式：
·基于数据包确认时延测量方法：测量每个包从发送到收到确认帧的时延。用数据包大小除时延，得到包的瞬时时延，平滑后为每字节平均时延，倒数为平均速率，需要说明的是，平滑采用α滤波机制。
·基于单位时间内确认数据统计测量方法：测量单位时间内，发送缓存TxBuffer_SeNB非空时间内的确认数据量。对测量的值进行平滑，平滑采用α滤波机制。
S502，所述主站将所述N个数据包分发至预期时延最小的目标链路进行传输。
本发明实施例中，主站将N个数据包分发至预期时延最小的目标链路进行传输，需要说明的是，该目标链路可以是第一链路，也可以是第二链路。预期时延包括但不限于单向时延或者环回时延。
本发明实施例中，主站从接收缓存中获取N个待传输的数据包，根据N个数据包的数据量，计算数据包在多条链路中每条链路上的预期时延，该多条链路包括第一链路以及至少一第二链路，该第一链路为主站与用户终端之间的链路，该第二链路为主站经辅站与用户终端之间的链路，将N个数据包分发至预期时延最小的目标链路进行传输，通过计算各条链路的预期时延，从而将数据包分发至预期时延最小的目标链路进程传输，避免用户终端接收数据等待超时。
请参照图6，为本发明实施例提供的另一种数据传输方法的流程示意图，如图所示，该数据传输方法包括以下步骤：
S600，所述主站接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
本发明实施例中，辅站中的X2反馈发送处理模块计算并处理生成下行数据传输状态报告，并反馈给MeNB。该下行数据传输状态报告中包含辅站期望接收数据缓存大小。
具体可选的，辅站SeNB对于期望接收数据缓存大小计算过程如下：
当SeNB缓存数据低于一定门限时，触发SeNB计算期望接收数据缓存大小，可以理解的是，也可以周期计算该数据缓存大小。
SeNB计算期望接收数据缓存大小的具体过程为：根据SeNB空口速率和SeNB目标缓存时间，计算SeNB期望接收数据缓存大小。
SeNB期望接收数据缓存大小＝SeNB空口速率*SeNB目标缓存时间。
SeNB目标缓存时间是可变的。
SeNB用户空口速率是指RxBuffer_SeNB非空时的SeNB空口传输速率。
S601，所述主站根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
本发明实施例中，主站根据期望接收数据缓存大小，计算分流周期，如图8所示，分流周期为主站接收到下行数据传输状态报告开始至预期传输完成与该期望接收数据缓存大小匹配数据量的结束时刻之间的时段。
需要说明的是，在分流周期内，主站从接收缓存中循环获取N个待传输至用户终端的数据包，在每次循环中，对该N个数据包进行分流处理，从而确定该N个数据包在哪一条目标链路进行传输。
需要说明的是，分流周期内每个分流时隙内所获取的N个数据包的数量可以不同，即是N可以不同。
S602，所述主站统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
本发明实施例中，主站统计从分流周期开始时刻后向辅站累积发送的总数据量，例如，若累积向辅站发送了两次数据包，每次为N个数据包，则总的数据量为2N个数据包的数据量，当然每个数据包的数据量可以不一致。
S603，若所述总数据量小于所述期望接收数据缓存大小，所述主站从接收缓存中获取N个待传输的数据包。
本发明实施例中，若总数据量小于辅站的期望接收数据缓存大小，则说明可以继续通过辅站向UE发送数据，则主站从接收缓存中获取N个待传输的数据包，并更新本次分流周期内往MeNB和SeNB分流的数据，进一步更新往MeNB和SeNB分流的数据的总的分流速率。
S604，所述主站根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
S605，所述主站将所述N个数据包分发至预期时延最小的目标链路进行传输。
本发明实施例步骤S604～S605，请参照图5的实施例步骤S501～S502，在此不再赘述。
S606，若所述总数据量大于或者等于所述期望接收数据缓存大小，所述主站计算所述主站与辅站之间第二链路的预期时延；
本发明实施例中，若计算得到该分流周期内累积向辅站发送的总数据量大于或者等于该辅站期望接收数据缓存大小，则说明不能继续通过该辅站向UE发送数据，主站计算当前第二链路的预期时延，具体的计算方法请参照图5的实施例中步骤S501，在此不再赘述。
S607，所述主站根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
本发明实施例中，主站根据第二链路的预期时延以及第一链路的预期时延，确定在第一链路传输的数据量大小M，M为大于等于0的自然数.
具体可选的，按先入先出(First Input First Output，FIFO)队列的方式从RxBuffer_MeNB队列中取出M个待分流的数据包，这些数据包在第一链路的预期时延估计结果恰好达到第二链路的预期时延，需要说明的是，若数据包在第一链路的预期时延大于第二链路的预期时延，则M＝0。
当RxBuffer_MeNB队列数据不足时，队列中所有数据包的预期时延估计结果会小于第二链路的预期时延，此时M为队列中所有数据包的数目。
S608，所述主站从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
本发明实施例中，主站将从接收缓存中获取的M个待传输的数据包分发至第一链路进行传输，第一链路为主站与用户终端UE之间的链路。同时更新往MeNB和SeNB分流的数据的总的分流速率。
可选的，若上述下行数据传输状态报告中包括重传数据包标识，则该数据传输方法还可以包括以下步骤S60～S61；
S60，所述主站根据所述重传数据包标识获取重传数据包；
本发明实施例中，下行数据传输状态报告中包括重传数据包标识，根据该重传数据包标识从相应的发送缓存中获取重传数据包。
S61，所述主站根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
本发明实施例中，主站获取重传数据包的序号，根据重传数据包的序号将其插入传输队列，保证传输队列中的数据包按序传输。
需要说明的是，如图9所示，辅站SeNB数据分流接收处理模块收到X2口丢失的重传数据包时，根据数据包的序号将其插入传输队列，保证传输队列中的数据包按序传输。
可以理解的是，辅站SeNB收到非重传数据包时，根据数据包的序号将其插入传输队列，保证传输队列中的数据包按序传输。
进一步可选的，本实施例的数据传输方法还可以包括以下步骤S62～S64；
S62，所述主站计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
本发明实施例中，预设周期可以是QoS保证周期，如图8所示，该预设周期包括多个分流周期，计算在该预设周期内第一链路以及该至少一第二链路上总的数据传输速率。
S63，所述主站判断所述总的数据传输速率是否大于预设阈值；
S64，若是，则所述主站确定所述主站满足预设服务质量QoS。
本发明实施例中，若总的数据传输速率大于预设阈值，则主站确定该主站满足预设服务质量QoS，在预设周期(即是图8的QoS保证周期)内不再进行数据分流处理。
本发明实施例中，主站从接收缓存中获取N个待传输的数据包，根据N个数据包的数据量，计算数据包在多条链路中每条链路上的预期时延，该多条链路包括第一链路以及至少一第二链路，该第一链路为主站与用户终端之间的链路，该第二链路为主站经辅站与用户终端之间的链路，将N个数据包分发至预期时延最小的目标链路进行传输，通过计算各条链路的预期时延，从而将数据包分发至预期时延最小的目标链路进程传输，避免用户终端接收数据等待超时。
请参照图10，为本发明提供的一种MeNB数据分流发送处理示意图，如图所示，包括以下步骤：
·步骤1：若主站接收缓存队列仍有数据未发送，则转步骤2；否则，本次分流周期结束。
·步骤2：若往SeNB分流的累积数据量超出根据当前X2口下行数据传输状态报告计算的期望接收数据缓存大小，则转步骤3；否则转步骤6。
·步骤3：按FIFO的方式从RxBuffer_MeNB队列中取出M个待分流的数据包，这些数据包的预期时延估计结果恰好达到SeNB链路的预期时延。(当RxBuffer_MeNB队列数据不足时，队列中所有数据包的预期时延估计结果会小于SeNB链路的预期时延，此时M为队列中数据包的数目。)
·步骤4：把取出来的M个数据包分发到第一链路。
·步骤5：更新往MeNB和SeNB分流的数据的总的分流速率。本次分流周期结束。
·步骤6：按FIFO的方式从RxBuffer_MeNB队列中取出N个待分流的数据包。N表示时延估计粒度，取决于硬件分流处理能力。N越小，对硬件分流处理能力要求越高。
·步骤7：对取出的N个数据包的数据量进行预期时延估计。
·步骤8：根据预期时延估计的结果，把取出来得N个数据包分发到预期时延较小的目标链路。
·步骤9：根据步骤8的结果，更新本次分流周期内往MeNB和SeNB分流的数据总的分流速率。
·步骤10：若用户总的分流速率满足用户QoS要求，则本次分流周期结束；否则转步骤1。
请参阅图11，图11是本发明实施例公开的一种数据传输装置的结构示意图，如图所示，本实施例的数据传输装置包括；
第一获取模块100，用于从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
第一计算模块101，用于根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
可选的，所述预期时延包括单向时延；
所述第一计算模块101根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
所述第一计算模块101根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
针对每个所述第二链路，所述第一计算模块101根据所述主站与所述第二链路对应辅站之间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
可选的，若所述主站与所述第二链路对应辅站之间同步，所述X2接口传输时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；
若所述主站与所述第二链路对应辅站之间异步，所述X2接口传输时延为根据在所述主站与所述第二链路对应辅站之间的X2接口进行信令交互中信令携带的时间戳以及在所述X2接口进行数据包发送/应答的消息中携带的时间戳获得。
可选的，所述数据包传输等待时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；或者，
所述数据包传输等待时延为根据所述分流周期开始时所述第二链路对应辅站发送缓存的数据量、所述第二链路对应辅站空口速率、所述分流周期开始时刻以及所述分流周期开始后所述第二链路对应辅站发送缓存的首包分发时刻获得。
可选的，所述预期时延包括环回时延；
所述第一计算模块101根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
所述第一计算模块101根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
针对每个第二链路，所述第一计算模块101根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
其中，所述主站的环回速率通过无线链路控制RLC状态报告中包含的数据包确认信息获得；所述辅站的环回速率通过所述第二链路对应辅站发送的下行数据传输状态报告中包含的数据包确认信息获得。
分发模块102，用于将所述N个数据包分发至预期时延最小的目标链路进行传输。
可选的，该装置还包括接收模块103、第二计算模块104以及统计模块105；
接收模块103，用于接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
第二计算模块104，用于根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
所述第一获取模块100具体用于在所述分流周期内，从接收缓存中循环获取N个待传输的数据包。
统计模块105，用于统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
所述第一获取模块100具体用于若所述总数据量小于所述期望接收数据缓存大小，从接收缓存中获取N个待传输的数据包。
可选的，该数据传输装置还可以包括第三计算模块106、第一确定模块107以及获取分发模块108；
第三计算模块106，用于若所述总数据量大于或者等于所述期望接收数据缓存大小，计算所述主站与辅站之间第二链路的预期时延；
第一确定模块107，用于根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
获取分发模块108，用于从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
进一步可选的，该数据传输装置还可以包括第二获取模块109和插入模块110；
第二获取模块109，用于根据所述重传数据包标识获取重传数据包；
插入模块110，用于根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
进一步可选的，该装置还可以包括第四计算模块111、判断模块112以及第二确定模块113；
第四计算模块111，用于计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
判断模块112，用于判断所述总的数据传输速率是否大于预设阈值；
第二确定模块113，用于若所述总的数据传输速率大于所述预设阈值，则确定所述主站满足预设服务质量QoS。
本发明实施例中，主站从接收缓存中获取N个待传输的数据包，根据N个数据包的数据量，计算数据包在多条链路中每条链路上的预期时延，该多条链路包括第一链路以及至少一第二链路，该第一链路为主站与用户终端之间的链路，该第二链路为主站经辅站与用户终端之间的链路，将N个数据包分发至预期时延最小的目标链路进行传输，通过计算各条链路的预期时延，从而将数据包分发至预期时延最小的目标链路进程传输，避免用户终端接收数据等待超时。
请参阅图12，图12是本发明实施例公开的一种数据传输装置的结构示意图。如图12所示，该装置可以包括：存储器1201、通信接口1202、至少一个处理器1203(如CPU)以及至少一个通信总线1204，存储器1201可以是高速RAM存储器，也可以是非易失性存储器(non-volatile memory)，如至少一个磁盘存储器，可选的，存储器1201还可以是至少一个位于远离前述处理器1103的存储装置。其中：
通信总线1204用于实现这些组件之间的连接通信。
存储器1201中存储一组程序代码，且处理器1203用于调用存储器1201中存储的程序代码，用于执行以下操作：
从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
通过所述通信接口1202用于将所述N个数据包分发至预期时延最小的目标链路进行传输。
在一个可选的实施例中，处理器1203用于调用存储器1201中存储的程序代码，还可以用于执行以下操作：
通过所述通信接口1202接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
在所述分流周期内，从接收缓存中循环获取N个待传输的数据包。
可选的，所述处理器1203用于调用存储器1201中存储的程序代码，还可以用于执行以下操作：
统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
若所述总数据量小于所述期望接收数据缓存大小，从接收缓存中获取N个待传输的数据包。
进一步可选的，所述处理器1203用于调用存储器1201中存储的程序代码，还可以用于执行以下操作：
若所述总数据量大于或者等于所述期望接收数据缓存大小，计算所述主站与辅站之间第二链路的预期时延；
根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
可选的，所述预期时延包括单向时延；
所述处理器1203根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
所述处理器1203根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
针对每个所述第二链路，所述第一计算模块根据所述主站与所述第二链路对应辅站之间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
可选的，若所述主站与所述第二链路对应辅站之间同步，所述X2接口传输时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；
若所述主站与所述第二链路对应辅站之间异步，所述X2接口传输时延为根据在所述 主站与所述第二链路对应辅站之间的X2接口进行信令交互中信令携带的时间戳以及在所述X2接口进行数据包发送/应答的消息中携带的时间戳获得。
可选的，所述数据包传输等待时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；或者，
所述数据包传输等待时延为根据所述分流周期开始时所述第二链路对应辅站发送缓存的数据量、所述第二链路对应辅站空口速率、所述分流周期开始时刻以及所述分流周期开始后所述第二链路对应辅站发送缓存的首包分发时刻获得。
可选的，所述预期时延包括环回时延；
所述处理器1203根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
针对每个第二链路，根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
其中，所述主站的环回速率通过无线链路控制RLC状态报告中包含的数据包确认信息获得；所述辅站的环回速率通过所述第二链路对应辅站发送的下行数据传输状态报告中包含的数据包确认信息获得。
进一步可选的，所述下行数据传输状态报告中包括重传数据包标识，所述处理器1203用于调用存储器1201中存储的程序代码，还可以用于执行以下操作：
根据所述重传数据包标识获取重传数据包；
根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
可选的，所述处理器1203用于调用存储器1201中存储的程序代码，还可以用于执行以下操作：
计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
判断所述总的数据传输速率是否大于预设阈值；
若所述总的数据传输速率大于所述预设阈值，则确定所述主站满足预设服务质量QoS。
本发明实施例中，主站从接收缓存中获取N个待传输的数据包，根据N个数据包的数据量，计算数据包在多条链路中每条链路上的预期时延，该多条链路包括第一链路以及至少一第二链路，该第一链路为主站与用户终端之间的链路，该第二链路为主站经辅站与用户终端之间的链路，将N个数据包分发至预期时延最小的目标链路进行传输，通过计算各条链路的预期时延，从而将数据包分发至预期时延最小的目标链路进程传输，避免用户终端接收数据等待超时。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，该流程可以由计算机程序来指令相关的硬件完成，该程序可存储于计算机可读取存储介质中，该程序在执行时，可包括如上述各方法实施例的流程。而前述的存储介质包括：ROM或随机存储记忆体RAM、磁碟或者光盘等各种可存储程序代码的介质。

Claims (20)

  1. 一种数据传输方法，其特征在于，包括：
    主站从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
    所述主站根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
    所述主站将所述N个数据包分发至预期时延最小的目标链路进行传输。
  2. 如权利要求1所述的方法，其特征在于，所述主站从接收缓存中获取N个待传输的数据包之前，还包括：
    所述主站接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
    所述主站根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
    所述主站从接收缓存中获取N个待传输的数据包，包括：
    在所述分流周期内，所述主站从接收缓存中循环获取N个待传输的数据包。
  3. 如权利要求2所述的方法，其特征在于，所述主站从接收缓存中获取N个待传输的数据包之前，还包括：
    所述主站统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
    若所述总数据量小于所述期望接收数据缓存大小，所述主站从接收缓存中获取N个待传输的数据包。
  4. 如权利要求3所述的方法，其特征在于，所述方法还包括：
    若所述总数据量大于或者等于所述期望接收数据缓存大小，所述主站计算所述主站与辅站之间第二链路的预期时延；
    所述主站根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
    所述主站从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
  5. 如权利要求2-4任意一项所述的方法，其特征在于，所述预期时延包括单向时延；
    所述主站根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延，包括：
    所述主站根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
    针对每个所述第二链路，所述主站根据所述主站与所述第二链路对应辅站之间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
  6. 如权利要求5所述的方法，其特征在于，若所述主站与所述第二链路对应辅站之间同步，所述X2接口传输时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；
    若所述主站与所述第二链路对应辅站之间异步，所述X2接口传输时延为根据在所述主站与所述第二链路对应辅站之间的X2接口进行信令交互中信令携带的时间戳以及在所述X2接口进行数据包发送/应答的消息中携带的时间戳获得。
  7. 如权利要求5所述的方法，其特征在于，所述数据包传输等待时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；或者，
    所述数据包传输等待时延为根据所述分流周期开始时所述第二链路对应辅站发送缓存的数据量、所述第二链路对应辅站空口速率、所述分流周期开始时刻以及所述分流周期开始后所述第二链路对应辅站发送缓存的首包分发时刻获得。
  8. 如权利要求2-4任意一项所述的方法，其特征在于，所述预期时延包括环回时延；
    所述主站根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延，包括：
    所述主站根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
    针对每个第二链路，所述主站根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
    其中，所述主站的环回速率通过无线链路控制RLC状态报告中包含的数据包确认信息获得；所述辅站的环回速率通过所述第二链路对应辅站发送的下行数据传输状态报告中包含的数据包确认信息获得。
  9. 如权利要求2所述的方法，其特征在于，所述下行数据传输状态报告中包括重传数据包标识，所述方法还包括：
    所述主站根据所述重传数据包标识获取重传数据包；
    所述主站根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
  10. 如权利要求2所述的方法，其特征在于，所述方法还包括：
    所述主站计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
    所述主站判断所述总的数据传输速率是否大于预设阈值；
    若是，则所述主站确定所述主站满足预设服务质量QoS。
  11. 一种数据传输装置，应用于主站，其特征在于，包括：
    第一获取模块，用于从接收缓存中获取N(N≥1的自然数)个待传输的数据包；
    第一计算模块，用于根据所述N个数据包的数据量，计算所述数据包在多条链路中每条链路上的预期时延，所述多条链路包括第一链路以及至少一第二链路，所述第一链路为所述主站与用户终端之间的链路，所述第二链路为所述主站经辅站与所述用户终端之间的链路；
    分发模块，用于将所述N个数据包分发至预期时延最小的目标链路进行传输。
  12. 如权利要求11所述的装置，其特征在于，所述装置还包括：
    接收模块，用于接收辅站发送的下行数据传输状态报告，所述下行数据传输状态报告包含所述辅站期望接收数据缓存大小；
    第二计算模块，用于根据所述期望接收数据缓存大小，计算分流周期，所述分流周期为所述主站接收到所述下行数据传输状态报告开始至预期传输完成与所述期望接收数据缓存大小匹配数据量的结束时刻之间的时段；
    所述第一获取模块具体用于在所述分流周期内，从接收缓存中循环获取N个待传输的数据包。
  13. 如权利要求12所述的装置，其特征在于，所述装置还包括：
    统计模块，用于统计从所述分流周期开始时刻后向所述辅站累积发送的总数据量；
    所述第一获取模块具体用于若所述总数据量小于所述期望接收数据缓存大小，从接收缓存中获取N个待传输的数据包。
  14. 如权利要求13所述的装置，其特征在于，所述装置还包括：
    第三计算模块，用于若所述总数据量大于或者等于所述期望接收数据缓存大小，计算所述主站与辅站之间第二链路的预期时延；
    第一确定模块，用于根据所述第二链路的预期时延以及所述第一链路的预期时延，确定在所述第一链路传输的数据量大小M(M≥0的自然数)；
    获取分发模块，用于从接收缓存获取所述M个待传输的数据包，并将所述M个待传输的数据包分发至所述第一链路进行传输。
  15. 如权利要求12-14任意一项所述的装置，其特征在于，所述预期时延包括单向时延；
    所述第一计算模块根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
    所述第一计算模块根据所述N个数据包的数据量以及所述主站空口速率，计算所述N个数据包在所述第一链路的单向时延；
    针对每个所述第二链路，所述第一计算模块根据所述主站与所述第二链路对应辅站之 间的X2接口传输时延、所述第二链路对应辅站的数据包传输等待时延、所述N个数据包的数据量以及所述第二链路对应辅站的空口速率，计算所述N个数据包在所述第二链路的单向时延。
  16. 如权利要求15所述的装置，其特征在于，若所述主站与所述第二链路对应辅站之间同步，所述X2接口传输时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；
    若所述主站与所述第二链路对应辅站之间异步，所述X2接口传输时延为根据在所述主站与所述第二链路对应辅站之间的X2接口进行信令交互中信令携带的时间戳以及在所述X2接口进行数据包发送/应答的消息中携带的时间戳获得。
  17. 如权利要求15所述的装置，其特征在于，所述数据包传输等待时延从所述第二链路对应辅站发送的下行数据传输状态报告中获得；或者，
    所述数据包传输等待时延为根据所述分流周期开始时所述第二链路对应辅站发送缓存的数据量、所述第二链路对应辅站空口速率、所述分流周期开始时刻以及所述分流周期开始后所述第二链路对应辅站发送缓存的首包分发时刻获得。
  18. 如权利要求12-14任意一项所述的装置，其特征在于，所述预期时延包括环回时延；
    所述第一计算模块根据所述N个数据包的数据量，计算所述N个数据包在多条链路中每条链路上的预期时延具体包括：
    所述第一计算模块根据所述N个数据包的数据量以及所述主站的环回速率，计算所述N个数据包在所述第一链路的环回时延；
    针对每个第二链路，所述第一计算模块根据所述N个数据包的数据量以及所述第二链路对应辅站的环回速率，计算所述N个数据包在所述第二链路的环回时延；
    其中，所述主站的环回速率通过无线链路控制RLC状态报告中包含的数据包确认信息获得；所述辅站的环回速率通过所述第二链路对应辅站发送的下行数据传输状态报告中包含的数据包确认信息获得。
  19. 如权利要求12所述的装置，其特征在于，所述下行数据传输状态报告中包括重传数据包标识，所述装置还包括：
    第二获取模块，用于根据所述重传数据包标识获取重传数据包；
    插入模块，用于根据所述重传数据包的序号，将所述重传数据包插入所述N个数据包之间。
  20. 如权利要求12所述的装置，其特征在于，所述装置还包括：
    第四计算模块，用于计算预设周期内所述第一链路以及所述至少一第二链路上总的数据传输速率，所述预设周期包括多个所述分流周期；
    判断模块，用于判断所述总的数据传输速率是否大于预设阈值；
    第二确定模块，用于若所述总的数据传输速率大于所述预设阈值，则确定所述主站满足预设服务质量QoS。
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