CN107277853A

CN107277853A - A kind of data transmission method and device

Info

Publication number: CN107277853A
Application number: CN201610212437.0A
Authority: CN
Inventors: 许建城; 符子建; 张劲林
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-04-07
Filing date: 2016-04-07
Publication date: 2017-10-20
Also published as: WO2017173923A1

Abstract

The embodiment of the invention discloses a kind of data transmission method and device, data transmission method includes：Main website obtains N (natural number of N >=1) individual packet waiting for transmission from order caching；The main website is according to the data volume of N number of packet, calculate expection time delay of the packet in multilink in each of the links, the multilink includes the first link and at least one second link, first link is the link between the main website and user terminal, and second link is the main website through the link between extension station and the user terminal；N number of packet delivery to the minimum Target Link of expected time delay is transmitted by the main website.Packet delivery to the minimum Target Link of expected time delay can be transmitted by the embodiment of the present invention, it is to avoid user terminal receives data latency time-out.

Description

A kind of data transmission method and device

Technical field

The present invention relates to communication technical field, more particularly to a kind of data transmission method and device.

Background technology

With the arrival in mobile broadband (Mobile Brondband, MBB) epoch, user is to network traffics band Wide demand more and more higher, expects that good Consumer's Experience can be enjoyed with place at any time.The third generation Partner program (The 3rd Generation Partnership Project, 3GPP) R12 standards are introduced Dual link (Dual Connectivity, DC) technology, user terminal can be simultaneously received come autonomous using the technology Stand (Master eNB, MeNB) and extension station (Secondary eNB, SeNB) data, lifting user handle up Rate.

As shown in figure 1, being DC chain of command connection diagrams, for DC user, S1 chain of command interface (S1 for The control plane, S1-MME) terminate at MeNB, MeNB and SeNB and pass through X2 chain of command interfaces (X2-Control plane, X2-C) is interconnected.

As shown in Fig. 2 being DC user plane connection diagrams, agreement supports two kinds of different user plane architectures： One kind is that S1 interfaces in the user plane (S1 for the user plane, S1-U) only terminate at MeNB, user plane number Transmitted according to using X2 interfaces in the user plane (X2-User plane, X2-U) from MeNB toward SeNB；Other one It is that S1-U can terminate in SeNB to plant.

But, different bearer types can be only fitted in different user plane architectures, user plane connection Dependent on bearer types configuration.Bearer types mainly include main plot group (Master Cell Group, MCG) Carrying, secondary cell group (Secondary Cell Group, SCG) carrying and packet Split carryings.

For MCG carryings, S1-U terminates at MeNB, and SeNB is not involved in the user face data of this bearer types Transmission.

For SCG carryings, by S1-U directly and S-GW connections, MeNB is not involved in this bearer types to SeNB User plane data transfer.

For Split carryings, S1-U terminates at MeNB, passes through X2-U transmission packes between MeNB and SeNB Data convergence protocol (Packet Data Convergence Protocol, PDCP) data.MeNB and SeNB It is involved in the user plane data transfer of this bearer types.Data transmission method proposed by the present invention, it is adaptable to Split The user plane data transfer of bearer types.

In the prior art, agreement【TS 36.425】The X2 user plane standards defined between MeNB and SeNB connect Mouthful, i.e. SeNB feeds back SeNB directions downlink data transmission state report using the standard interface to MeNB Accuse, report content includes sequentially being successfully sent to the user terminal UE PDCP agreements received from MeNB Maximum PDCP PDU series numbers (Sequence in data cell (Protocol Data Unit, PDU) Number, SN), related E-UTRAN Radio Access Bearer (E-UTRAN Radio Access Bearer, E-RAB expected data cache size), minimum expectation cache size total all E-RAB of UE and X2 mouthfuls are lost Bag is indicated, but how the standard interface of defined does not solve MeNB in MeNB and SeNB in agreement Between be transmitted the distribution of data volume, how packet sends, and these factors have for the performance of dual link There is important influence.

The content of the invention

The embodiment of the present invention provides a kind of data transmission method and device, can be by packet delivery to when being expected The Target Link for prolonging minimum is transmitted, it is to avoid user terminal receives data latency time-out.

First aspect present invention provides a kind of data transmission method, including：

Main website obtains N (natural number of N >=1) individual packet waiting for transmission from order caching；

The main website calculates the packet every in multilink according to the data volume of N number of packet Expection time delay on bar link, the multilink includes the first link and at least one second link, described First link is the link between the main website and user terminal, and second link is the main website through extension station With the link between the user terminal；

N number of packet delivery to the minimum Target Link of expected time delay is transmitted by the main website.It is logical N number of packet delivery to the minimum Target Link of expected time delay can be transmitted by crossing this mode, it is to avoid User terminal receives data latency time-out.

Based in a first aspect, in the first feasible embodiment of first aspect, the main website is from reception Before obtaining N number of packet waiting for transmission in caching, in addition to：

The main website receives the downlink data transmission state report that extension station is sent, the downlink data transmission state Report is expected to receive data buffer storage size comprising the extension station；

The main website expects to receive data buffer storage size, calculating shunting cycle, the shunting cycle according to described The downlink data transmission state report is received for the main website to start to expected be transmitted to expect with described Receive the period between the finish time of data buffer storage size matched data amount；

The main website obtains N number of packet waiting for transmission from order caching, including：

Within the shunting cycle, the main website circulates the N number of packet waiting for transmission of acquisition from order caching.

The first feasible embodiment based on first aspect, in second of feasible embodiment party of first aspect In formula, the main website is obtained from order caching before N number of packet waiting for transmission, in addition to：

The main website statistics accumulates the total data sent after the start time in shunting cycle to the extension station Amount；

If the total amount of data, which is less than the expectation, receives data buffer storage size, the main website is from order caching Obtain N number of packet waiting for transmission.

Based on second of feasible embodiment of first aspect, in the third feasible embodiment party of first aspect In formula, methods described also includes：

If the total amount of data, which is more than or equal to the expectation, receives data buffer storage size, the main website is calculated The expection time delay of second link between the main website and extension station；

The main website is according to the expection time delay of second link and the expection time delay of first link, really It is scheduled on the data volume size M (natural number of M >=0) of first link transmission；

The main website obtains the M packet waiting for transmission from order caching, and to be transmitted by the M Packet delivery to first link be transmitted.

Based on first aspect in the third feasible embodiment of the first feasible embodiment~first aspect Any one feasible embodiment, in the 4th kind of feasible embodiment of first aspect, the expection Time delay includes One Way Delay；

The main website calculates N number of packet in multilink according to the data volume of N number of packet Expection time delay in middle each of the links, including：

The main website calculates described according to the data volume and the main website radio interface rate of N number of packet One Way Delay of N number of packet in first link；

For each second link, extension station is answered according to the main website and second link pair by the main website Between X2 interface propagation delay time, second link pair answers the packet of extension station to transmit to wait time delay, described The data volume of N number of packet and second link pair answer the radio interface rate of extension station, calculate N number of number According to the One Way Delay wrapped in second link.

Based on the 4th kind of feasible embodiment of first aspect, in the 5th kind of feasible embodiment party of first aspect In formula, if the main website is synchronous between answering extension station with second link pair, the X2 interface propagation delay time from Second link pair is answered in the downlink data transmission state report that extension station is sent and obtained；

If the main website and second link pair answer asynchronous between extension station, the X2 interface propagation delay time is root Signaling in Signalling exchange is carried out according to the X2 interface answered in the main website and second link pair between extension station to take The timestamp of band and the timestamp carried in the message that the X2 interface carries out packet transmission/response are obtained .

Based on the 4th kind of feasible embodiment of first aspect, in the 6th kind of feasible embodiment party of first aspect In formula, the packet transmission waits the downlink data transmission that time delay answers extension station to send from second link pair Obtained in state report；Or,

The packet transmission waits time delay second link pair described in when being started according to the shunting cycle should be auxiliary When the data volume for sending caching, second link pair of standing answer the extension station radio interface rate, the shunting cycle to start Carve and the shunting cycle starts rear second link pair and answers the first packet delivery time of extension station transmission caching to obtain .

Based on first aspect in the third feasible embodiment of the first feasible embodiment~first aspect Any one feasible embodiment, in the 7th kind of feasible embodiment of first aspect, the expection Time delay includes loopback delay；

The main website calculates institute according to the data volume of N number of packet and the loopback speed of the main website State loopback delay of N number of packet in first link；

For each second link, the main website is according to the data volume of N number of packet and described second Link pair answers the loopback speed of extension station, calculates loopback delay of the N number of packet in second link；

Wherein, the loopback speed of the main website passes through the data that are included in wireless spread-spectrum technology RLC state reports Bag confirmation is obtained；The loopback speed of the extension station answers the descending of extension station transmission by second link pair The packet confirmation included in data transmission state report is obtained.

Based in a first aspect, in the 8th kind of feasible embodiment of first aspect, the downlink data is passed Defeated state report includes retransmitting package identification, and methods described also includes：

The main website obtains according to the re-transmission package identification and retransmits packet；

The re-transmission packet is inserted N number of number by the main website according to the sequence number of the re-transmission packet According between bag.

Based in a first aspect, in the 9th kind of feasible embodiment of first aspect, methods described also includes：

The main website calculates number total on first link in predetermined period and at least one second link According to transmission rate, the predetermined period includes multiple shunting cycles；

Whether total message transmission rate described in the main station judging is more than predetermined threshold value；

If so, then the main website determines that the main website meets preset service quality Q oS.

Second aspect of the present invention provides a kind of data transmission device, applied to main website, including：

First acquisition module, for obtaining N (natural number of N >=1) individual number waiting for transmission from order caching According to bag；

First computing module, for the data volume according to N number of packet, calculates the packet many Expection time delay in bar link in each of the links, the multilink includes the first link and at least one second Link, first link is the link between the main website and user terminal, and second link is described Main website is through the link between extension station and the user terminal；

Distribution module, for N number of packet delivery to the minimum Target Link of expected time delay to be passed It is defeated.N number of packet delivery to the minimum Target Link of expected time delay can be transmitted in this way, User terminal is avoided to receive data latency time-out.

Based on second aspect, in the first feasible embodiment of second aspect, described device also includes：

Receiving module, the downlink data transmission state report for receiving extension station transmission, the downlink data is passed Defeated state report is expected to receive data buffer storage size comprising the extension station；

Second computing module, for expecting to receive data buffer storage size according to described, calculates shunting cycle, institute State the shunting cycle for the main website receive the downlink data transmission state report start to expection be transmitted With the period for expecting to receive between the finish time of data buffer storage size matched data amount；

First acquisition module is specifically within the shunting cycle, circulation obtains N from order caching Individual packet waiting for transmission.

The first feasible embodiment based on second aspect, in second of feasible embodiment party of second aspect In formula, described device also includes：

Statistical module, for counting after the start time in shunting cycle to the total of extension station accumulation transmission Data volume；

If it is big that first acquisition module is less than the expectation reception data buffer storage specifically for the total amount of data It is small, N number of packet waiting for transmission is obtained from order caching.

Based on second of feasible embodiment of second aspect, the third feasible embodiment in second aspect In, described device also includes：

3rd computing module, if being more than or equal to the expectation for the total amount of data receives data buffer storage Size, calculates the expection time delay of the second link between the main website and extension station；

First determining module, for the pre- of the expection time delay according to second link and first link Phase time delay, it is determined that in the data volume size M (natural number of M >=0) of first link transmission；

Distribution module is obtained, for obtaining the M packet waiting for transmission from order caching, and will be described M packet delivery waiting for transmission to first links are transmitted.

Based on second aspect in the third feasible embodiment of the first feasible embodiment~second aspect Any one feasible embodiment, it is described pre- in the 4th kind of feasible embodiment of second aspect Phase time delay includes One Way Delay；

First computing module calculates N number of packet and existed according to the data volume of N number of packet Expection time delay in multilink in each of the links is specifically included：

First computing module according to the data volume and the main website radio interface rate of N number of packet, Calculate One Way Delay of the N number of packet in first link；

For each second link, first computing module is according to the main website and second link When X2 interface propagation delay time, second link pair between correspondence extension station answer the packet transmission wait of extension station Prolong, the data volume of N number of packet and second link pair answer the radio interface rate of extension station, calculate institute State One Way Delay of N number of packet in second link.

Based on the 4th kind of feasible embodiment of second aspect, in the 5th kind of feasible embodiment party of second aspect In formula, if the main website is synchronous between answering extension station with second link pair, the X2 interface propagation delay time from Second link pair is answered in the downlink data transmission state report that extension station is sent and obtained；

Based on the 4th kind of feasible embodiment of second aspect, in the 6th kind of feasible embodiment party of second aspect In formula, the packet transmission waits the downlink data transmission that time delay answers extension station to send from second link pair Obtained in state report；Or,

Based on second aspect in the third feasible embodiment of the first feasible embodiment~second aspect Any one feasible embodiment, it is described pre- in the 7th kind of feasible embodiment of second aspect Phase time delay includes loopback delay；

First computing module is according to the data volume of N number of packet and the loopback speed of the main website Rate, calculates loopback delay of the N number of packet in first link；

For each second link, first computing module according to the data volume of N number of packet and Second link pair answers the loopback speed of extension station, calculates ring of the N number of packet in second link Return time delay；

The first feasible embodiment based on second aspect, in the 8th kind of feasible embodiment of second aspect In, the downlink data transmission state report includes retransmitting package identification, and described device also includes：

Second acquisition module, packet is retransmitted for being obtained according to the re-transmission package identification；

Module is inserted, for the sequence number according to the re-transmission packet, the re-transmission packet is inserted into the N Between individual packet.

The first feasible embodiment based on second aspect, in the 9th kind of feasible embodiment of second aspect In, described device also includes：

4th computing module, for calculating first link and at least one second chain in predetermined period Total message transmission rate on road, the predetermined period includes multiple shunting cycles；

Judge module, for judging whether total message transmission rate is more than predetermined threshold value；

Second determining module, if being more than the predetermined threshold value for total message transmission rate, it is determined that The main website meets preset service quality Q oS.

In the embodiment of the present invention, main website obtains N number of packet waiting for transmission from order caching, according to N number of The data volume of packet, calculates expection time delay of the packet in multilink in each of the links, a plurality of chain Road includes the first link and at least one second link, and first link is the chain between main website and user terminal Road, second link be main website through the link between extension station and user terminal, by N number of packet delivery to pre- The minimum Target Link of phase time delay is transmitted, by calculating the expection time delay of each bar link, so that by data Bag is distributed to the minimum Target Link process transmission of expected time delay, it is to avoid user terminal receives data latency time-out.

Brief description of the drawings

Technical scheme in order to illustrate the embodiments of the present invention more clearly, institute in being described below to embodiment The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are the one of the present invention A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, also Other accompanying drawings can be obtained according to these accompanying drawings.

A kind of DC chains of command connection diagram that Fig. 1 provides for the present invention；

A kind of DC user planes connection diagram that Fig. 2 provides for the present invention；

A kind of LTE DC system architecture diagrams that Fig. 3 provides for the present invention；

Fig. 4 shunts schematic diagram for a kind of WIFI that the present invention is provided；

A kind of schematic flow sheet for data transmission method that Fig. 5 provides for the present invention；

The schematic flow sheet for another data transmission method that Fig. 6 provides for the present invention；

A kind of dual link data distribution configuration diagram that Fig. 7 provides for the present invention；

A kind of schematic diagram in shunting cycle that Fig. 8 provides for the present invention；

A kind of SeNB data distributions reception processing schematic diagram that Fig. 9 provides for the present invention；

A kind of data distribution process chart that Figure 10 provides for the present invention；

A kind of structural representation for data transmission device that Figure 11 provides for the present invention；

The structural representation for another data transmission device that Figure 12 provides for the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear Chu, it is fully described by, it is clear that described embodiment is a part of embodiment of the invention, rather than all Embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative labor The every other embodiment obtained under the premise of dynamic, belongs to the scope of protection of the invention.

The data transmission method of the embodiment of the present invention can apply in Fig. 3 or Fig. 4 system architecture, such as Fig. 3 Shown, present invention could apply in Long Term Evolution (Long Term Evolution, LTE) standard system Shunting.As illustrated, MeNB obtains data, number from gateway (Serving Gateway, S-GW) Two subflows can be divided into according in MeNB, a subflow is directly transmitted to UE, another height by MeNB Stream is then transmitted to UE by SeNB, and the embodiment of the present invention is mainly for every N number of data waiting for transmission in subflow Bag selection target link transmission process is illustrated.

It is also possible to apply the invention to the shunting between different system standard.As shown in figure 4, such as LTE and WiFi Between shunting, application scenarios are as illustrated, MeNB obtains data from S-GW, and data point are in eNB Two subflows a, subflow is directly transmitted to UE by eNB, and another subflow then passes through WiFi wireless access Point (Access Point, AP) is transmitted to UE, and the embodiment of the present invention is mainly for every N number of to be passed in subflow Defeated packet selection target link transmission process is illustrated.

Fig. 5 is refer to, is a kind of flow chart of data transmission method provided in an embodiment of the present invention, this method can With applied to main website, for example：The eNB in MeNB or Fig. 4 in Fig. 3.Fig. 5 is the data transfer The flow chart of method, is comprised the following steps that：

S500, main website obtains N (natural number of N >=1) individual packet waiting for transmission from order caching；

In the embodiment of the present invention, main website MeNB is obtained from the order caching of main website N number of to be passed transports to UE Packet, N represent time delay estimate granularity, depending on hardware shunt disposal ability.N is smaller, to hardware Shunt disposal ability and require higher.As shown in fig. 7, being a kind of MeNB knot provided in an embodiment of the present invention Structure schematic diagram, as illustrated, RxBuffer_MeNB is main website order caching queue, caching comes from S-GW The packet sended over.

S501, the main website calculates the packet in a plurality of chain according to the data volume of N number of packet Expection time delay in road in each of the links, the multilink includes the first link and at least one second link, First link is the link between the main website and user terminal, and second link passes through for the main website Link between extension station and the user terminal；

In the embodiment of the present invention, main website calculates packet in multilink according to the data volume of N number of packet Expection time delay in middle each of the links, specific computational methods are not limited thereto, optionally, a plurality of chain Road includes the first link and at least one the second links, as shown in figure 3, the first link is main website MeNB With the link between user terminal UE, the second link is main website MeNB whole with user by extension station SeNB Hold the link between UE.If it should be noted that extension station SeNB includes multiple, the quantity of the second link Including multiple.

Optionally, if the expected time delay includes One Way Delay, the main website according to the data volume of N number of packet, Calculate expection time delay of the N number of packet in multilink in each of the links and specifically include following steps S50~S51；

S50, the main website is calculated according to the data volume and the main website radio interface rate of N number of packet One Way Delay of the N number of packet in first link；

In the embodiment of the present invention, the first link is the link between main website MeNB and UE, as shown in fig. 7, For a kind of main website MeNB structural representation provided in an embodiment of the present invention, as illustrated, the main website includes Order caching queue (RxBuffer_MeNB)：For caching the packet sended over from S-GW；It is main Stand and send buffer queue (TxBuffer_MeNB)：For caching the not yet receipts shunted toward main website (MeNB) The packet (being the packet that caching is sent toward the first link) for confirming to indicate successfully is submitted to lower floor RLC； Extension station sends buffer queue (TxBuffer_SeNB)：For caching the not yet receipts shunted toward extension station (SeNB) Successfully submitted to (being fed back through X2 mouthfuls) SeNB lower floors RLC and confirm that the packet indicated (is that caching is past The packet that second link is sent).

Further, main website MeNB also includes X2 mouthfuls of feedback reception processing modules：For according under reception Row data transmission state report carry out respective handling, and result export to data distribution send processing mould Block, is used as the decision-making foundation of data distribution.

As illustrated, extension station SeNB includes extension station order caching queue (RxBuffer_SeNB)：For delaying Deposit the packet that main website (MeNB) shunting (through X2 mouthfuls of forwardings) comes.These packets are not yet toward UE Send, or UE confirmation (Acknowledgement, ACK) is sent but not yet received toward UE Frame.

Specific optional, the X2 mouth feedback receptions processing module in main website MeNB extracts downlink data transmission The information carried in state report, the information of carrying (has included but is not limited to sequentially except standard interface information Maximum PDCP PDU SN in being successfully sent to the UE PDCP PDU received from MeNB, correlation E-RAB expected data cache size, minimum expectation cache size total all E-RAB of UE and X2 mouthfuls Packet loss is indicated) outside, X2 port transmission time delays (MeNB- can also be included>SeNB), SeNB user eats dishes without rice or wine speed Rate and the transmission of SeNB user data packages wait the information such as time delay.

Main website MeNB indicates that re-transmission is lost according to the X2 mouths packet loss included in downlink data transmission state report The packet of mistake.The packet of loss can be in the first link transmission, can also be in the second link transmission.

If the packet lost is inserted into transmission queue in the first link transmission according to the sequence number of packet, Ensure that the packet in transmission queue is sequentially transmitted.

If the packet lost is in the second link transmission, the packet that prioritised transmission is lost.

According to the packet confirmation included in downlink data transmission state report, from TxBurrer_SeNB The middle packet for removing transmission success.

The standard interface information carried in downlink data transmission state report is extracted, calculating allows newly to send out toward SeNB The data volume size sent.

Main website MeNB also includes data distribution and sends processing module, and MeNB is handled according to X2 feedback receptions The result of module output, determines the packet being in main website order caching queue RxBuffer_MeNB To the shunting of different links.During shunting, the module considers the qos requirement of user simultaneously.

For each Split carryings, every time when MeNB receives the downlink data transmission shape fed back from SeNB When state is reported, all start a new shunting cycle.The shunting cycle is represented from receiving downlink data transmission state The moment is reported, untill at the time of being expected to be transmitted the data volume for allowing to shunt toward SeNB.

QoS guarantee cycle T p represents during this period of time, and the data that shunt toward MeNB and SeNB are total Shunting speed must is fulfilled for user's qos requirement.Fig. 8 illustrates shunting cycle T sp and downlink data transmission shape Relation between the cycle T fp of state report.In realization, downlink data transmission state report can be the cycle Feedback or event feedback.The time length in shunting cycle depends on hardware shunt disposal ability, preceding The time length in shunting cycle can be with different afterwards.The time length in QoS guarantee cycle, is variable.

It is specific optional, it is contemplated that time delay can include One Way Delay, calculated for the One Way Delay of the first link Mode can use following calculation：

The One Way Delay of first link=(after the data volume of N number of packet of taking-up+this shunting cycle starts TxBuffer_MeNB when data volume+this shunting cycle added up toward the MeNB packets shunted starts In data volume)/MeNB link radio interface rates.MeNB links radio interface rate is that TxBuffer_MeNB is non- The MeNB link air interface transmission speed of space-time.

S51, for each second link, the main website should according to the main website and second link pair X2 interface propagation delay time, second link pair between extension station answer extension station packet transmit wait time delay, The data volume of N number of packet and second link pair answer the radio interface rate of extension station, calculate the N One Way Delay of the individual packet in second link.

In the embodiment of the present invention, for each second link One Way Delay calculation can using this second Link pair answers the information of extension station to be calculated, and specific calculation can use following calculation：

Second link One Way Delay=X2 interface propagation delay time (MeNB->SeNB)+SeNB packets transmission etc. After time delay+(data volume of N number of packet of taking-up+this shunting cycle start after added up toward SeNB shunting Packet data volume)/second link the radio interface rate.

Optionally, if main website is synchronous between answering extension station with the second link pair, the X2 interface propagation delay time can be with Obtained in the downlink data transmission state report for answering extension station to send from second link pair.

The X2 interface propagation delay time of packet=from at the time of receiving the packet for X2 mouthfuls-packet exists The delivery time that MeNB is recorded when shunting, extension station is carried out smoothly to the value of measurement, smooth to filter machine using α System.

It should be noted that the X2 interface propagation delay time of packet answers the X2 of extension station anti-by second link pair Feedback sends processing module calculating processing and obtained.

Optionally, if main website and the second link pair answer asynchronous, X2 interface propagation delay time between extension station (MeNB->SeNB), can also be by being taken in X2 interface Signalling exchange and the message of packet transmission/response Band timestamp, and then approximately obtained by measuring estimation transmission/reception timestamp.Specific metering system is as follows：

When MeNB adds SeNB, the Signalling exchange flow based on X2 SeNB Addition obtains X2 Initial loopback delay, calculate as follows：

RTTx2=(T SENB ADDITION ACKNOWLEDGE-T SENB ADDITION REQUEST)；Wherein, T SENB ADDITION REQUEST are that MeNB sends SENB At the ADDITTION REQUEST message moment, T SENB ADDITION ACKNOWLEDGE are MeNB receives the SeNB SENB ADDITTION ACKNOWLEDGE message moment.

When shunting is carried when packet issues SeNB, it is necessary to stamp time stamp T sent in each packet. SeNB is received after the packet, and DL DATA DELIVERY STATUS message packages are being fed back to MeNB When, the time stamp T sent of the SeNB packets from MeNB being most recently received, and SeNB are sent out The DL DATA DELIVERY STATUS message package moment is sent to receive the time difference of this packet with SeNB Δ T information brings MeNB in DL DATA DELIVERY STATUS message with road.MeNB is each When receiving DL DATA DELIVERY STATUS message packages, it is Treceived constantly that record, which is received, and Calculate X2 interface loopback delay RTTx2n：

RTTx2n=T_receivedn-T_sentn-Δ T

Then it is filtered again：

RTTx2n=(1-a) * RTTx2n-1+a*RTTx2n；

Signalling exchange flow based on X2 SeNB Addition when RTTx2 initial values can take addition SeNB The X2 loopback delays of acquisition.A is filter factor.

When Split, which is carried on a period of time no packet, issues SeNB, MeNB needs actively construction hair Send one individually to measure bag and issue SeNB, X2 loopback delay is measured according to above-mentioned processing mode, is surveyed Amount result calculates according to above-mentioned processing mode and participates in filtering.

X2 port transmission time delays (MeNB->SeNB 1/2nd of X2 mouthfuls of loopback delays) are taken.

Time delay is waited for packet, the X2 of extension station can be answered to feed back by second link pair and send processing module Calculated, and then processing module is sent by X2 feedbacks and be encapsulated into down packet transmission wait time delay The X2 feedback reception processing modules that main website is fed back in the report of row data transmission state are handled, optionally, Packet transmission waits time delay to be calculated using following calculation：

The scheduled transmission time of packet wait time delay=RxBuffer_SeNB packets-receive this from X2 mouthfuls At the time of packet.Then the value again to measurement is carried out smoothly, smooth to use α filtering mechanisms.

In some optional embodiments, such as extension station does not feed back the scene that packet transmission waits time delay, Packet transmission waits time delay to carry out estimating approximately to obtain in MeNB：

Packet transmission waits time delay=(TxBuffer_SeNB data volume when this shunting cycle starts - MIN (TxBuffer_SeNB data volume when this shunting cycle starts, SeNB link radio interface rates * (this First packet shunts the moment in secondary start time in shunting cycle-TxBuffer_SeNB)))/SeNB link radio interface rates.

Optionally, if the expected time delay includes loopback delay, the main website according to the data volume of N number of packet, Calculate expection time delay of the N number of packet in multilink in each of the links and specifically include following steps S52~S53；

S52, the main website is according to the data volume of N number of packet and the loopback speed of the main website, meter Calculate loopback delay of the N number of packet in first link；

In the embodiment of the present invention, it is contemplated that time delay can be loopback delay, the expection time delay for calculating each bar link is When being the loopback of every second link in the loopback delay and at least one the second link for calculate the first link Prolong.

It can send processing module by data distribution to carry out calculating that loopback delay is calculated in main website MeNB Manage, specific calculation can be：

First link loopback delay=(data volume of N number of packet of taking-up+this shunting cycle start after Add up the data volume toward the MeNB packets shunted)/first link loopback the speed+(this shunting cycle starts When TxBuffer_MeNB data volume-MIN (TxBuffer_MeNB data when this shunting cycle starts Amount, the first link loopback speed * is (when first packet is shunted in this shunting start time in cycle-TxBuffer_MeNB Carve)))/first link loopback speed.

First link loopback rate estimates can by the packet confirmation that is included in RLC state reports, Estimation is obtained, and specific validation testing can use the optional mode of the following two kinds：

Time-delay measuring method is confirmed based on packet：Measure each packet and receive acknowledgement frame from being sent to Time delay.Data package size remove time delay, obtain the instantaneous time delay of packet, by the instantaneous time delay it is smooth after, obtain To every byte average delay, inverse is Mean Speed.It should be noted that smoothing processing filters machine using α System.

Based on confirmation data statistics measuring method in the unit interval：In cooling water of units of measurement time, caching is sent Confirmation data volume in TxBuffer_MeNB non-empty times.Value to measurement is smoothed, and is smoothly adopted Use α filtering mechanisms.

S53, for each second link, the main website is according to the data volume of N number of packet and described Second link pair answers the loopback speed of extension station, calculates N number of packet in the loopback of second link Prolong；

In the embodiment of the present invention, for each second link, main website is according to can should be auxiliary according to the second link pair The loopback speed and the data volume of N number of packet stood calculate the loopback delay for obtaining second link：

Second link loopback delay=(data volume of N number of packet of taking-up+this shunting cycle start after Add up the data volume toward the SeNB packets shunted)/second link loopback the speed+(when this shunting cycle starts TxBuffer_SeNB data volume-MIN (TxBuffer_SeNB data volume when this shunting cycle starts, Second link loopback speed * (first packet shunting moment in this shunting start time in cycle-TxBuffer_SeNB)))/ Second link loopback speed.

The second link loopback rate estimates can be using the X2 mouth feedback reception processing modules of main website under The packet confirmation included in the report of row data transmission state, estimation is obtained.

Second link loopback rate estimates can use the optional embodiment of the following two kinds：

Time-delay measuring method is confirmed based on packet：The each bag of measurement is from being sent to the time delay that receives acknowledgement frame. Time delay is removed with data package size, the instantaneous time delay wrapped, smoothly rear is that, per byte average delay, inverse is Mean Speed is, it is necessary to which explanation, smooth to use α filtering mechanisms.

Based on confirmation data statistics measuring method in the unit interval：In cooling water of units of measurement time, caching is sent Confirmation data volume in TxBuffer_SeNB non-empty times.Value to measurement is carried out smoothly, smooth using α filters Ripple mechanism.

S502, the main website is passed N number of packet delivery to the minimum Target Link of expected time delay It is defeated.

In the embodiment of the present invention, main website carries out N number of packet delivery to the minimum Target Link of expected time delay Transmission is, it is necessary to which explanation, the Target Link can be the first link or the second link.It is expected that Time delay includes but is not limited to One Way Delay or loopback delay.

Fig. 6 is refer to, is the schematic flow sheet of another data transmission method provided in an embodiment of the present invention, such as Shown in figure, the data transmission method comprises the following steps：

S600, the main website receives the downlink data transmission state report that extension station is sent, and the downlink data is passed Defeated state report is expected to receive data buffer storage size comprising the extension station；

In the embodiment of the present invention, the X2 feedbacks in extension station send processing module and calculate and handle generation downlink data Transmission state is reported, and feeds back to MeNB.Connect in the downlink data transmission state report comprising extension station expectation Receive data buffer storage size.

Specific optional, extension station SeNB is for it is expected that reception data buffer storage size calculating process is as follows：

When SeNB is data cached is less than certain thresholding, triggering SeNB, which is calculated, to be expected to receive data buffer storage size, It is understood that can also the computation of Period data buffer storage size.

SeNB calculates the detailed process for expecting to receive data buffer storage size：According to SeNB radio interface rates and The SeNB target cache times, calculate SeNB and expect to receive data buffer storage size.

SeNB expects to receive data buffer storage size=SeNB radio interface rate * SeNB target cache times.

The SeNB target cache times are variable.

SeNB user's radio interface rate refers to SeNB air interface transmission speed during RxBuffer_SeNB non-NULLs.

S601, the main website expects to receive data buffer storage size, calculating shunting cycle, described point according to described The stream cycle receives the downlink data transmission state report for the main website and starts to expection to be transmitted and institute State the period between the finish time for expecting reception data buffer storage size matched data amount；

In the embodiment of the present invention, main website calculates shunting cycle, such as Fig. 8 according to expecting to receive data buffer storage size Shown, the shunting cycle receives downlink data transmission state report for main website and starts to expected to be transmitted with being somebody's turn to do Expect to receive the period between the finish time of data buffer storage size matched data amount.

It should be noted that within the shunting cycle, main website circulates that acquisition is N number of to be passed to be transported to from order caching The packet of user terminal, in each circulation, shunting processing is carried out to N number of packet, so that it is determined that N number of packet is transmitted in which bar Target Link.

It should be noted that the quantity of N number of packet acquired in each shunting time slot in the shunting cycle can It is that N can be different with difference.

S602, the main website statistics accumulates the total of transmission after the start time in shunting cycle to the extension station Data volume；

In the embodiment of the present invention, main website statistics accumulates the sum sent after shunting start time in cycle to extension station Be every time N number of packet if having sent packet twice for example, accumulating to extension station according to amount, then total number According to data volume of the amount for 2N packet, the data volume of certainly each packet can be with inconsistent.

S603, if the total amount of data be less than it is described expect to receive data buffer storage size, the main website is from reception N number of packet waiting for transmission is obtained in caching.

In the embodiment of the present invention, if the expectation that total amount of data is less than extension station receives data buffer storage size, illustrate Extension station can be continued through and send data to UE, then main website obtains N number of number waiting for transmission from order caching According to bag, and the data shunted in this shunting cycle toward MeNB and SeNB are updated, further updated past Total shunting speed of the data of MeNB and SeNB shuntings.

S604, the main website calculates the packet in a plurality of chain according to the data volume of N number of packet Expection time delay in road in each of the links, the multilink includes the first link and at least one second link, First link is the link between the main website and user terminal, and second link passes through for the main website Link between extension station and the user terminal；

S605, the main website is passed N number of packet delivery to the minimum Target Link of expected time delay It is defeated.

Step of embodiment of the present invention S604~S605, refer to Fig. 5 embodiment step S501~S502, herein Repeat no more.

S606, if the total amount of data is more than or equal to the expectation and receives data buffer storage size, the master Stand and calculate the expection time delay of the second link between the main website and extension station；

In the embodiment of the present invention, if calculating, to obtain accumulating the total amount of data sent to extension station in the shunting cycle big Expect to receive data buffer storage size in or equal to the extension station, then explanation can not continue through the extension station and send out to UE Data are sent, main website calculates the expection time delay of current second link, and specific computational methods refer to Fig. 5 reality Step S501 in example is applied, be will not be repeated here.

S607, when the main website is according to the expection of the expection time delay of second link and first link Prolong, it is determined that in the data volume size M (natural number of M >=0) of first link transmission；

In the embodiment of the present invention, main website according to the expection time delay of the second link and the expection time delay of the first link, It is determined that being the natural number more than or equal to 0 in data volume the size M, M of the first link transmission

It is specific optional, by FIFO (First Input First Output, FIFO) queue mode from M packets to be shunted are taken out in RxBuffer_MeNB queues, these packets are pre- the first link Phase time delay estimated result reaches the expection time delay of the second link just, it is necessary to explanation, if packet is the The expection time delay of one link is more than the expection time delay of the second link, then M=0.

When RxBuffer_MeNB queuing datas are not enough, the expection time delay estimation knot of all packets in queue Fruit can be less than the expection time delay of the second link, and now M is the number of all packets in queue.

S608, the main website obtains the M packet waiting for transmission from order caching, and by the M Packet delivery waiting for transmission to first link is transmitted.

In the embodiment of the present invention, main website by the M obtained from order caching packet deliveries waiting for transmission to First link is transmitted, and the first link is the link between main website and user terminal UE.Update past simultaneously Total shunting speed of the data of MeNB and SeNB shuntings.

Optionally, if above-mentioned downlink data transmission state report includes retransmitting package identification, the data Transmission method can also comprise the following steps S60~S61；

S60, the main website obtains according to the re-transmission package identification and retransmits packet；

In the embodiment of the present invention, downlink data transmission state report includes retransmitting package identification, according to this Retransmit package identification acquisition from corresponding transmission caching and retransmit packet.

The re-transmission packet is inserted the N by S61, the main website according to the sequence number of the re-transmission packet Between individual packet.

In the embodiment of the present invention, main website obtains the sequence number for retransmitting packet, will according to the sequence number for retransmitting packet It inserts transmission queue, it is ensured that the packet in transmission queue is sequentially transmitted.

It should be noted that as shown in figure 9, extension station SeNB data distribution receiving processing modules receive X2 mouthfuls During the re-transmission packet of loss, transmission queue is inserted into according to the sequence number of packet, it is ensured that in transmission queue Packet sequentially transmit.

It is understood that when extension station SeNB receives non-re-transmission packet, being inserted according to the sequence number of packet Enter to transmit queue, it is ensured that the packet in transmission queue is sequentially transmitted.

Further alternative, the data transmission method of the present embodiment can also comprise the following steps S62~S64；

S62, the main website calculates in predetermined period total on first link and at least one second link Message transmission rate, the predetermined period include multiple shunting cycles；

In the embodiment of the present invention, predetermined period can be the QoS guarantee cycle, as shown in figure 8, the default week Phase includes multiple shunting cycles, calculates in the predetermined period on the first link and at least one second link Total message transmission rate.

Whether S63, total message transmission rate described in the main station judging is more than predetermined threshold value；

S64, if so, then the main website determines that the main website meets preset service quality Q oS.

In the embodiment of the present invention, if total message transmission rate is more than predetermined threshold value, main website determines the main website Preset service quality Q oS is met, is no longer carried out in predetermined period (being Fig. 8 QoS guarantee cycle) Data distribution processing.

Figure 10 is refer to, processing schematic diagram is sent for a kind of MeNB data distributions that the present invention is provided, such as schemes It is shown, comprise the following steps：

Step 1：If main website order caching queue still there are data not send, 2 are gone to step；Otherwise, this Shunt end cycle.

Step 2：If exceeding toward the accumulation data volume that SeNB is shunted according to current X2 mouthfuls of downlink data transmission The expectation that state report is calculated receives data buffer storage size, then goes to step 3；Otherwise 6 are gone to step.

Step 3：M numbers to be shunted are taken out from RxBuffer_MeNB queues in the way of FIFO According to bag, the expection time delay estimated result of these packets reaches the expection time delay of SeNB links just.(when When RxBuffer_MeNB queuing datas are not enough, the expection time delay estimated result of all packets can be small in queue In the expection time delay of SeNB links, now M is the number of packet in queue.)

Step 4：The M packet taken out is distributed to the first link.

Step 5：Update total shunting speed toward the MeNB and SeNB data shunted.This shunting week Phase terminates.

Step 6：N number of number to be shunted is taken out from RxBuffer_MeNB queues in the way of FIFO According to bag.N represents that time delay estimates granularity, depending on hardware shunt disposal ability.N is smaller, to hardware shunt Disposal ability requires higher.

Step 7：Data volume to N number of packet of taking-up carries out being expected time delay estimation.

Step 8：The result estimated according to expected time delay, take out N number of packet delivery to expection The less Target Link of time delay.

Step 9：According to the result of step 8, update in this shunting cycle toward MeNB and SeNB shuntings The total shunting speed of data.

Step 10：If the shunting speed of user always meets user's qos requirement, this shunting end cycle； Otherwise 1 is gone to step.

Figure 11 is referred to, Figure 11 is a kind of structural representation of data transmission device disclosed in the embodiment of the present invention, As illustrated, the data transmission device of the present embodiment includes；

First acquisition module 100, it is individual to be transmitted for obtaining N (natural number of N >=1) from order caching Packet；

First computing module 101, for the data volume according to N number of packet, calculates the packet Expection time delay in multilink in each of the links, the multilink includes the first link and at least one Second link, first link is the link between the main website and user terminal, and second link is The main website is through the link between extension station and the user terminal；

Optionally, the expected time delay includes One Way Delay；

First computing module 101 calculates N number of data according to the data volume of N number of packet Expection time delay of the bag in multilink in each of the links is specifically included：

First computing module 101 is eated dishes without rice or wine speed according to the data volume and the main website of N number of packet Rate, calculates One Way Delay of the N number of packet in first link；

For each second link, first computing module 101 is according to the main website and described second Link pair answers X2 interface propagation delay time, second link pair between extension station to answer the packet of extension station to transmit etc. Treat that time delay, the data volume of N number of packet and second link pair answer the radio interface rate of extension station, count Calculate One Way Delay of the N number of packet in second link.

It is preferred that, if the main website is synchronous between answering extension station with second link pair, the X2 interface transmission Obtained in the downlink data transmission state report that time delay answers extension station to send from second link pair；

It is preferred that, the packet transmission waits the lower line number that time delay answers extension station to send from second link pair Obtained in being reported according to transmission state；Or,

Optionally, the expected time delay includes loopback delay；

First computing module 101 is according to the data volume of N number of packet and the loopback of the main website Speed, calculates loopback delay of the N number of packet in first link；

For each second link, first computing module 101 is according to the data volume of N number of packet And second link pair answers the loopback speed of extension station, N number of packet is calculated in second link Loopback delay；

Distribution module 102, for N number of packet delivery to the minimum Target Link of expected time delay to be entered Row transmission.

Optionally, the device also includes receiving module 103, the second computing module 104 and statistical module 105；

Receiving module 103, the downlink data transmission state report for receiving extension station transmission, the downlink data Transmission state report is expected to receive data buffer storage size comprising the extension station；

Second computing module 104, for expecting to receive data buffer storage size according to described, calculates the shunting cycle, The shunting cycle receives the downlink data transmission state report for the main website and starts to expection to transfer Into the period for expecting to receive between the finish time of data buffer storage size matched data amount；

First acquisition module 100 from order caching specifically within the shunting cycle, circulating and obtaining Take N number of packet waiting for transmission.

Statistical module 105, for counting what is sent after the start time in shunting cycle to extension station accumulation Total amount of data；

If first acquisition module 100 is less than the expectation reception data specifically for the total amount of data and delayed Size is deposited, N number of packet waiting for transmission is obtained from order caching.

Optionally, the data transmission device can also include the 3rd computing module 106, the first determining module 107 And obtain distribution module 108；

3rd computing module 106, delays if being more than or equal to the expectation for the total amount of data and receiving data Size is deposited, the expection time delay of the second link between the main website and extension station is calculated；

First determining module 107, for the expection time delay according to second link and first link It is expected that time delay, it is determined that in the data volume size M (natural number of M >=0) of first link transmission；

Distribution module 108 is obtained, for obtaining the M packet waiting for transmission from order caching, and will The M packet delivery waiting for transmission to first links are transmitted.

Further alternative, the data transmission device can also include the second acquisition module 109 and insertion module 110；

Second acquisition module 109, packet is retransmitted for being obtained according to the re-transmission package identification；

Module 110 is inserted, for the sequence number according to the re-transmission packet, by the re-transmission packet insertion institute State between N number of packet.

Further alternative, the device can also include the 4th computing module 111, judge module 112 and the Two determining modules 113；

4th computing module 111, for calculating first link and described at least one second in predetermined period Total message transmission rate on link, the predetermined period includes multiple shunting cycles；

Judge module 112, for judging whether total message transmission rate is more than predetermined threshold value；

Second determining module 113, if being more than the predetermined threshold value for total message transmission rate, really The fixed main website meets preset service quality Q oS.

Figure 12 is referred to, Figure 12 is a kind of structural representation of data transmission device disclosed in the embodiment of the present invention. As shown in figure 12, the device can include：Memory 1201, communication interface 1202, at least one processing Device 1203 (such as CPU) and at least one communication bus 1204, memory 1201 can be high-speed RAM Memory or nonvolatile memory (non-volatile memory), such as at least one disk storage Device, optionally, memory 1201 can also be at least one storage for being located remotely from aforementioned processor 1103 Device.Wherein：

Communication bus 1204 is used to realize the connection communication between these components.

Batch processing code is stored in memory 1201, and processor 1203 is used to call in memory 1201 The program code of storage, for performing following operation：

N (natural number of N >=1) individual packet waiting for transmission is obtained from order caching；

According to the data volume of N number of packet, the calculating packet is in multilink in each of the links Expection time delay, the multilink include the first link and at least one second link, first link For the link between the main website and user terminal, second link is that the main website is used through extension station with described Link between the terminal of family；

It is used for by the communication interface 1202 by N number of packet delivery to the minimum target of expected time delay Link is transmitted.

In an optional embodiment, processor 1203 is used to call the program generation stored in memory 1201 Code, can be also used for performing following operation：

The downlink data transmission state report that extension station is sent is received by the communication interface 1202, it is described descending Data transmission state report is expected to receive data buffer storage size comprising the extension station；

Expect to receive data buffer storage size according to described, calculate the shunting cycle, the shunting cycle is the master Station receives the downlink data transmission state report and starts to expected be transmitted to expect to receive data with described Period between the finish time of cache size matched data amount；

Within the shunting cycle, circulation obtains N number of packet waiting for transmission from order caching.

Optionally, the processor 1203 is used to call the program code that stores in memory 1201, can be with For performing following operation：

Count the total amount of data accumulated and sent to the extension station after the start time in shunting cycle；

If the total amount of data, which is less than the expectation, receives data buffer storage size, obtain N number of from order caching Packet waiting for transmission.

Further alternative, the processor 1203 is used to call the program code stored in memory 1201, It can be also used for performing following operation：

If the total amount of data, which is more than or equal to the expectation, receives data buffer storage size, the main website is calculated The expection time delay of the second link between extension station；

According to the expection time delay of second link and the expection time delay of first link, it is determined that described The data volume size M (natural number of M >=0) of first link transmission；

The M packets waiting for transmission are obtained from order caching, and by the M packets waiting for transmission First link is distributed to be transmitted.

Optionally, the expected time delay includes One Way Delay；

The processor 1203 calculates N number of packet and existed according to the data volume of N number of packet Expection time delay in multilink in each of the links is specifically included：

The processor 1203 is according to the data volume and the main website radio interface rate of N number of packet, meter Calculate One Way Delay of the N number of packet in first link；

Optionally, the expected time delay includes loopback delay；

According to the data volume of N number of packet and the loopback speed of the main website, N number of number is calculated According to the loopback delay wrapped in first link；

, should according to the data volume of N number of packet and second link pair for each second link The loopback speed of extension station, calculates loopback delay of the N number of packet in second link；

Further alternative, the downlink data transmission state report includes retransmitting package identification, described Processor 1203 is used to call the program code stored in memory 1201, can be also used for performing following behaviour Make：

Obtained according to the re-transmission package identification and retransmit packet；

According to the sequence number of the re-transmission packet, the re-transmission packet is inserted between N number of packet.

Optionally, the processor 1203 is used to call the program code stored in memory 1201, may be used also For performing following operate：

Calculate data transfer speed total on first link and at least one second link in predetermined period Rate, the predetermined period includes multiple shunting cycles；

Judge whether total message transmission rate is more than predetermined threshold value；

If total message transmission rate is more than the predetermined threshold value, it is determined that the main website meets default clothes Quality Q of being engaged in oS.

One of ordinary skill in the art will appreciate that all or part of flow in above-described embodiment method is realized, It can be by computer program to instruct the hardware of correlation to complete, described program can be stored in a calculating In machine read/write memory medium, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method. Wherein, described storage medium can for magnetic disc, CD, read-only memory (Read-Only Memory, ) or random access memory (Random Access Memory, RAM) etc. ROM.

Step in present invention method can be sequentially adjusted, merged and deleted according to actual needs.

Module in data transmission device of the embodiment of the present invention can merge according to actual needs, divide and Delete.

The parts such as the microcontroller of the embodiment of the present invention, can use universal integrated circuit, such as central processing unit (Central Processing Unit, CPU), or using application specific integrated circuit (Application Specific Integrated Circuit, ASIC) realize.

Claims

1. a kind of data transmission method, it is characterised in that including：

N number of packet delivery to the minimum Target Link of expected time delay is transmitted by the main website.

2. the method as described in claim 1, it is characterised in that the main website obtains N from order caching Before individual packet waiting for transmission, in addition to：

3. method as claimed in claim 2, it is characterised in that the main website obtains N from order caching Before individual packet waiting for transmission, in addition to：

4. method as claimed in claim 3, it is characterised in that methods described also includes：

5. the method as described in claim 2-4 any one, it is characterised in that the expected time delay includes One Way Delay；

6. method as claimed in claim 5, it is characterised in that if the main website and second link pair Synchronization between extension station is answered, the X2 interface propagation delay time answers the lower line number that extension station is sent from second link pair Obtained in being reported according to transmission state；

7. method as claimed in claim 5, it is characterised in that the packet transmission waits time delay from institute State and obtained in the downlink data transmission state report that the second link pair answers extension station to send；Or,

8. the method as described in claim 2-4 any one, it is characterised in that the expected time delay includes Loopback delay；

9. method as claimed in claim 2, it is characterised in that in the downlink data transmission state report Including retransmitting package identification, methods described also includes：

10. method as claimed in claim 2, it is characterised in that methods described also includes：

11. a kind of data transmission device, applied to main website, it is characterised in that including：

Distribution module, for N number of packet delivery to the minimum Target Link of expected time delay to be passed It is defeated.

12. device as claimed in claim 11, it is characterised in that described device also includes：

13. device as claimed in claim 12, it is characterised in that described device also includes：

14. device as claimed in claim 13, it is characterised in that described device also includes：

15. the device as described in claim 12-14 any one, it is characterised in that the expected delay packet Include One Way Delay；

16. device as claimed in claim 15, it is characterised in that if the main website and second link Synchronous between correspondence extension station, the X2 interface propagation delay time answers the descending of extension station transmission from second link pair Obtained in data transmission state report；

17. device as claimed in claim 15, it is characterised in that the packet transmission wait time delay from Second link pair is answered in the downlink data transmission state report that extension station is sent and obtained；Or,

18. the device as described in claim 12-14 any one, it is characterised in that the expected delay packet Include loopback delay；

19. device as claimed in claim 12, it is characterised in that the downlink data transmission state report Include retransmitting package identification, described device also includes：

20. device as claimed in claim 12, it is characterised in that described device also includes：