CN105611537A - Unauthorized frequency band channel multiplexing method and device - Google Patents

Unauthorized frequency band channel multiplexing method and device Download PDF

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Publication number
CN105611537A
CN105611537A CN201510958506.8A CN201510958506A CN105611537A CN 105611537 A CN105611537 A CN 105611537A CN 201510958506 A CN201510958506 A CN 201510958506A CN 105611537 A CN105611537 A CN 105611537A
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China
Prior art keywords
time
channel
transmission
laa base
base station
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CN201510958506.8A
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CN105611537B (en
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崔琪楣
谷宇
李震
陶小峰
张平
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides an unauthorized frequency band channel multiplexing method and device. The specific implementation mode of the method comprises the steps: detecting channel energy in a detection frame of a transmission period when there is to-be-transmitted data; employing a transmission frame in the first transmission time for data transmission before count-down is over when a channel is detected to be idle, request signals which are transmitted by other LAA base stations and participates in channel multiplexing are detected and the first transmission starts; transmitting a request signal for obtaining the withdrawing time of other LAA base stations to other LAA base stations if request signals which are transmitted by other LAA base stations and participates in channel multiplexing are not detected; determining an LAA base station currently participating in the channel multiplexing and the starting time of second transmission, wherein the starting time of second transmission employs a transmission frame to data transmission. According to the embodiment of the invention, the method can achieve the channel multiplexing of a plurality of LAA base stations of the same service operator at an unauthorized frequency band.

Description

A kind of channel multiplexing method of unauthorized frequency range and device
Technical field
The present invention relates to communication technical field, particularly a kind of channel multiplexing method of unauthorized frequency range and device.
Background technology
Along with the sharp increase of customer service demand, the especially rise of video class business, existing LTE system is difficult to meetUser's request, must seek new technology. LTE uses unauthorized frequency range and coexists with WiFi is to solve at present the not enough problem of frequency spectrumHot discussion object, third generation partner program 3GPP (the3rdGenerationPartnershipProject)Use unauthorized frequency range the main skill with WiFi harmonious coexistence in the formal LAA of proposition of Realease-13 stage technology as LTEArt. Existing LTE base station can either, normally authorizing frequency range work, can be shunted partial service again after using LAA systemTo LAA in order in unauthorized band transmissions.
To the simplicity of explanation of LAA be its as a WiFi website can with other WiFi fair competitions, and busy channelAfter can as a LTE base station, transmit expeditiously data.
In prior art, for LAA base station can be competed as WiFi website, the ETSI of ETSI(EuropeanTelecommunicationsStandardsInstitute) Listen Before Talk LBT (Listen has been proposedBeforeTalk) as the key technology of LAA. Adopt after LBT technology, LAA system is divided into three rings in the time carrying out transfer of dataJoint: clear channel assessment (CCA) CCA, Channel holding time COT and free time (IdlePeriod). When having data, LAA base station to connectEnter channel, first by clear channel assessment (CCA) CCA, within the evaluation time, examine by energy measuring ED (EnergyDetection)Survey channel energy and whether exceed threshold value, if be no more than threshold value, judge that channel can be occupied, LAA base station starts to take letterRoad transmits data; If channel energy exceedes threshold value, busy channel (now may have WiFi website at busy channel) not,Until detect and just start to transmit data when channel energy is no more than threshold value.
Further, for the difference in clear channel assessment (CCA) CCA stage, above-mentioned LBT technology can be divided into 4 types,Respectively: Class1, NOLBT; Type 2, does not have the LBT of random back; Type 3, has random back but contention window is fixingLBT; Type 4, the LBT that has random back and contention window to change. Wherein, CCA can be divided into ICCA stage and ECCA stage, ICCATime span is fixed, and the time span of ECCA is according to the difference of backoff value BO and difference, and backoff value BO is an integer, itValue between 0～CW, the maximum CW of this backoff value is exactly contention window. Class1 is without clear channel assessment (CCA) CCA, LAA base stationWhile having data to transmit, directly access channel; The CCA length of type 2 is fixed, after clear channel assessment (CCA) finishes, and LAA baseStand and access channel; The CCA length variations of type 3 and 4, the length of CCA can change according to not being both of BO value and CW value,LAA base station's access channel after clear channel assessment (CCA) finishes.
Although LAA technology can improve the transfer rate of existing LTE system, still have certain deficiency. For example,, when oneAfter LAA base station's access channel, near other LAA base stations of same operator may detect channel busy, thereby freeze to detect,Wait for channel idle. And multiple LAA base station of same operator is to take at one time same channel in factCarry out channel multiplexing. That is to say, existing LAA BTS channel multiplexing method cannot be realized multiple LAA of same operatorBase station concurrent multiplexing channel, channel multiplexing efficiency is not high.
The application designs the method for carrying out channel multiplexing between multiple LAA base station of same operator based on type 4.
Summary of the invention
The object of the embodiment of the present invention has been to provide a kind of channel multiplexing method and device of unauthorized frequency range, Neng GoushiMultiple LAA base station of existing same operator is at the channel multiplexing of unauthorized frequency range.
In order to achieve the above object, the invention discloses a kind of channel multiplexing method of unauthorized frequency range, be applied to mandateAssist access LAA base station, comprising:
In the time there is data to be transmitted, in the detection frame in the cycle of transmission, channel energy is detected; Wherein, send weekPhase comprises that one is detected frame, a transmission frame and a blank frame;
In the time channel idle being detected, determine back off time, and start transfer of data countdown based on described back off time;
Before described countdown finishes, obtain the demand signalling of described back off time if receive, described in sending, move backKeep away the time;
In the time detecting that the demand signalling and first of the participation channel multiplexing that other LAA base stations send transmits the time started,Adopt transmission frame to carry out transfer of data in described the first transmission time started;
Obtain the demand signalling of described back off time if do not receive or the participation that other LAA base stations send do not detectedThe demand signalling of channel multiplexing,, in the time that described countdown finishes, sends and obtains moving back of other LAA base stations to other LAA base stationsKeep away the demand signalling of time;
The back off time returning according to other LAA base stations, according to preset rules, determines the LAA of current participation channel multiplexingBase station and the second transmission time started, and to the multiplexing demand signalling of each LAA base station transmitting channel and the of participating in channel multiplexingTwo transmission time starteds; Adopt transmission frame to carry out transfer of data in described the second transmission time started.
Preferably, described method also comprises:
If channel busy detected before countdown finishes, freeze described countdown, when channel again being detectedWhen idle, the described countdown of thawing.
Preferably, described method also comprises:
After countdown finishes, before the first transmission time started or the second transmission time started, if channel detectedBusy, finish the channel multiplexing process in described the first transmission time started or the second transmission time started, repeat sendingThe step in the detection frame in cycle, channel energy being detected.
Preferably, described method also comprises:
According to the duration of contention window in the upper transmission cycle, the confirmation message number obtaining after transfer of data and CW i + 1 = { CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine the duration of contention window in the current transmission cycle, wherein CWiForThe duration of contention window in the upper transmission cycle, CWi+1For the duration of contention window in the current transmission cycle, α is upper one and sends weekIn the confirmation message number obtaining after the transmission of interim transmission intraframe data and this transmission cycle, send the ratio of the sub-frame number in frameValue.
Preferably, the described back off time returning according to other LAA base stations, according to preset rules, determines current participation letterThe LAA base station that road is multiplexing, comprising:
The back off time returning according to other LAA base stations, the median of described other LAA base station back off times of identification;
Back off time is less than to other LAA base stations of described median, is defined as the LAA base of current participation channel multiplexingStand.
Preferably, described method also comprises:
The duration that interior WiFi website of transmission cycle carries out the blank frame of transfer of data is not less than 5% of transmission frame duration, sends outSend frame duration between 1ms～10ms.
In order to achieve the above object, the invention discloses a kind of channel multiplexing device of unauthorized frequency range, be applied to mandateAssist access LAA base station, comprising:
Channel Detection module in the time there is data to be transmitted, is entered channel energy in the detection frame in the cycle of transmissionRow detects; Wherein, the transmission cycle comprises that one is detected frame, a transmission frame and a blank frame;
Countdown module, in the time channel idle being detected, determines back off time, and starts based on described back off timeTransfer of data countdown;
Back off time sending module, before finish in described countdown, obtains described back off time if receiveDemand signalling, sends described back off time;
The first transport module, for when the demand signalling and the of the participation channel multiplexing that other LAA base stations send being detectedWhen one transmission time started, adopt transmission frame to carry out transfer of data in described the first transmission time started;
Back off time is asked for module, if obtain the demand signalling of described back off time or do not detect for not receivingThe demand signalling of the participation channel multiplexing that other LAA base stations send,, in the time that described countdown finishes, sends out to other LAA base stationsSend the demand signalling of the back off time that obtains other LAA base stations;
The second transport module, for the back off time returning according to other LAA base stations, according to preset rules, determines currentParticipate in LAA base station and the second transmission time started of channel multiplexing, and to each LAA base station transmitting channel of participating in channel multiplexingMultiplexing demand signalling and the second transmission time started; Adopt transmission frame to carry out transfer of data in described the second transmission time started.
Preferably, described device also comprises that countdown freezes module;
Module is freezed in described countdown, if channel busy detected before finishing in countdown, described in freezingCountdown, in the time again channel idle being detected, the described countdown of thawing.
Preferably, described device also comprises contention window determination module;
Described contention window determination module, for according to the duration of a upper transmission cycle contention window, obtains after transfer of dataConfirmation message number and CW i + 1 = { CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine in the current transmission cycle competingStrive the duration of window, wherein CWiFor the duration of contention window in the upper transmission cycle, CWi+1For contention window in the current transmission cycleDuration, α sent the confirmation message number obtaining after intraframe data transmission and sends out in this transmission cycle in the upper transmission cycleSend the ratio of the sub-frame number in frame.
Preferably, described the second transport module comprises;
Recognin module, for the back off time returning according to other LAA base stations, keep out of the way described other LAA base stations of identificationThe median of time;
Determine submodule, for back off time being less than to other LAA base stations of described median, be defined as current participation letterThe LAA base station that road is multiplexing.
As seen from the above technical solution, in the embodiment of the present invention, in the time channel idle being detected, finish it in countdownBefore, detect that when LAA base station the demand signalling and first of the participation channel multiplexing of other LAA base stations transmissions transmits the time startedTime, carry out transfer of data in the first transmission time started; Obtain the demand signalling of back off time or do not detect when not receivingWhile arriving the demand signalling of participation channel multiplexing of other LAA base stations transmissions, in the time that countdown finishes, send to other LAA base stationsObtain the demand signalling of the back off time of other LAA base stations, and carry out transfer of data in the second transmission time started, can realizeMultiple LAA base station of same operator is at the channel multiplexing of unauthorized frequency range, thereby improved channel multiplexing efficiency.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existingThere is the accompanying drawing of required use in technical description to be briefly described. Apparently, the accompanying drawing in the following describes is only thisSome embodiment of invention, for those of ordinary skill in the art, not paying under the prerequisite of creative work, all rightObtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of the channel multiplexing method of a kind of unauthorized frequency range that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is a kind of structural representation that sends the cycle in the embodiment of the present invention;
The difference of transmitting the time started when channel multiplexing that Fig. 3 provides for the embodiment of the present invention is determined the schematic diagram of scheme;
In the testing process that Fig. 4 provides for the embodiment of the present invention, freeze and the schematic diagram of the countdown of thawing;
The another kind of schematic flow sheet of step S106 in Fig. 1 that Fig. 5 provides for the embodiment of the present invention;
The schematic flow sheet of the channel multiplexing method of the another kind of unauthorized frequency range that Fig. 6 a provides for the embodiment of the present invention;
The process schematic diagram of the example explanation of the LAA website multipling channel that Fig. 6 b provides for the embodiment of the present invention;
The structural representation of the channel multiplexing device of a kind of unauthorized frequency range that Fig. 7 provides for the embodiment of the present invention;
The structural representation of the channel multiplexing device of the another kind of unauthorized frequency range that Fig. 8 provides for the embodiment of the present invention.
Detailed description of the invention
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, completeWhole description. Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiment. BaseEmbodiment in the present invention, it is all that those of ordinary skill in the art obtain under the prerequisite of not making creative workOther embodiment, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of channel multiplexing method and device of unauthorized frequency range, can realize same operationMultiple LAA base station of business is at the channel multiplexing of unauthorized frequency range.
Below by specific embodiment, the present invention is described in detail.
Referring to Fig. 1, this figure is that the flow process of the channel multiplexing method of a kind of unauthorized frequency range of providing of the embodiment of the present invention is shownIntention, comprises the steps:
Step S101: in the time there is data to be transmitted, in the detection frame in the cycle of transmission, channel energy is detected.
Wherein, the transmission cycle comprises that one is detected frame, a transmission frame and a blank frame, as shown in Figure 2. WiFi websiteCan utilize the blank frame in the transmission cycle to carry out transfer of data, in actual applications, the duration of blank frame is not less than transmission frame5% of duration, sends frame duration between 1ms～10ms.
Step S102: in the time channel idle being detected, determine back off time, and start data biography based on described back off timeDefeated countdown.
Particularly, in the time of WiFi busy channel, channel energy can increase. If detect that channel energy is not more than certain thresholdValue, can determine that channel is idle. In the time channel idle being detected, LAA base station is from obtaining a number between 0～contention windowBe worth, determine the back off time of this LAA base station according to this numerical value. Suppose, contention window is 50, obtains at random a number from 0～50Value 17, can determine that the back off time of LAA base station is 170 μ s according to numerical value 17, and start countdown from this 170 μ s.
Step S103: before described countdown finishes, obtain the demand signalling of described back off time if receive, send outSend described back off time.
In actual applications, the communication between the Different L AA base station of same operator is undertaken by X2 interface. IfReceive the demand signalling that obtains back off time by X2 interface, explanation has other LAA base stations to initiate channel multiplexing.
Step S104: when demand signalling and the first transmission that the participation channel multiplexing that other LAA base stations send detected are openedWhen time beginning, adopt transmission frame to carry out transfer of data in described the first transmission time started.
Step S105: obtain the demand signalling of described back off time if do not receive or other LAA base stations do not detectedThe demand signalling of the participation channel multiplexing sending,, in the time that described countdown finishes, sends and obtains other to other LAA base stationsThe demand signalling of the back off time of LAA base station.
Step S106: the back off time returning according to other LAA base stations, according to preset rules, determine current participation channelMultiplexing LAA base station and the second transmission time started, and to the multiplexing request of each LAA base station transmitting channel of participating in channel multiplexingSignaling and the second transmission time started; Adopt transmission frame to carry out transfer of data in described the second transmission time started.
Particularly, obtain the demand signalling of back off time if do not receive, when the countdown that this LAA base station is described finishesBetween early than countdown end time of other LAA base stations in same group; If the participation letter that other LAA base stations send do not detectedThe demand signalling that road is multiplexing, illustrates that this LAA base station do not participate in the channel multiplexing that initiate other LAA base stations. Both of these case allJudgement before countdown finishes. Therefore, do not participate in the channel multiplexing that initiate other base stations meeting this LAA base station, withAnd when two conditions of countdown rate FEFO of this LAA base station, in the time that countdown finishes, this LAA base station is sent out to other LAA base stationsSend the demand signalling of the back off time that obtains other LAA base stations.
Obtaining after the back off time of other LAA base stations, which LAA this LAA base station, by the rule according to certain, determinesChannel multiplexing is participated in base station, specifically can have various ways, for example, back off time can be less than to the LAA of threshold value sometimeBase station is defined as participating in the object of channel multiplexing, or it is multiple that all LAA base stations of returning to back off time are defined as participating in channelWith object.
In order to ensure that LAA base station can access channel in time, in another embodiment of the present invention, corresponding to Fig. 1Step S106 in shown embodiment of the method, the back off time returning according to other LAA base stations, according to preset rules, determinesThe LAA base station of current participation channel multiplexing, can carry out according to the flow process shown in Fig. 5, and detailed process comprises the steps:
Step S501: the back off time returning according to other LAA base stations, described other LAA base station back off times of identificationMedian;
Step S502: back off time is less than to other LAA base stations of described median, is defined as current participation channel multiplexingLAA base station.
In the present embodiment, as a mode preferably, the LAA base station of participating in channel multiplexing should meet certain condition,Be that its back off time should be relatively little. Can reduce the stand-by period like this, accelerated data transfer process.
Determine and participated in after the object of channel multiplexing, need to be according to the back off time of the object of this participation channel multiplexing, reallyFixed the second transmission time started. Determining of the second transmission time started, will affect LAA base station and WiFi website to channel occupancy timeFairness.
Suppose, the countdown end time of initiating multiplexing LAA base station is defined as transmitting the time started, and other participate in multipleWith LAA base station all " shift to an earlier date " transmit data, as shown in Figure 3. In this mode the time of LAA base station waits shorter, from Fig. 3 instituteShow the time that does not almost wait for known LAA base station, after Channel Detection completes, carry out transfer of data, WiFi access channelChance will reduce, unfairness concerning WiFi. Channel Detection process shown in Fig. 3 comprises the process of carrying out channel energy detectionAnd the process of carrying out countdown according to back off time.
Suppose, by the longest LAA base station (the LAA2 base as shown in Figure 3 of back off time in the LAA base station of participation channel multiplexingStand) the countdown end time be defined as transmitting the time started, other LAA base stations need be waited for when the countdown of LAA2 base station finishesBetween arrival, thereby " delaying " transmission data, as shown in Figure 3. In this mode, the chance of WiFi access channel will increase,How to consider the fairness to WiFi, but reduced the possibility of LAA access channel.
Therefore, the fairness when taking into account LAA base station and WiFi website to channel occupancy, is determining the transmission time startedTime can adopt the way of " compromise ", be about to the mean value of the back off time of the LAA base station of participating in channel multiplexing, or median,Or smaller value in mean value and median is as the transmission time started.
As seen from the above-described embodiment, in the embodiment of the present invention, when a LAA base station detects channel idle and countdownWhen end, send channel multiplexing request to other LAA, then determine and participate in channel multiplexing according to the back off time of other LAALAA base station and transmission time started. Counted in the determined transmission time started simultaneously this LAA base station and other LAA base stationsReportedly defeated, realize multiple LAA base station of same operator at the channel multiplexing of unauthorized frequency range, improve the effect of channel multiplexingRate.
In another embodiment of the present invention, in the embodiment of the method shown in Fig. 1, also comprise, if tied in countdownBefore bundle, channel busy detected, freeze described countdown, in the time again channel idle being detected, the described countdown of thawing.In schematic diagram shown in Fig. 4, in the countdown process of LAA base station, if WiFi carries out transfer of data or other operatorsTransfer of data is carried out in LAA base station, and LAA base station detects channel busy, and now countdown is freezed in LAA base station, when WiFi websiteComplete while being channel idle after transfer of data with the LAA base station of other operators, LAA base station detects channel idle, thawsCountdown. Visible, this avoidance mechanism of LAA base station can avoid WiFi website to cause larger interference, to WiFi website moreFair.
In another embodiment of the present invention, in the embodiment of the method shown in Fig. 1, also comprise, finish it in countdownAfter, before the first transmission time started or the second transmission time started, if channel busy detected, finish to pass described firstThe channel multiplexing process of defeated time started or the second transmission time started, repeats in the detection frame in the cycle of transmission channel energyThe step detecting. After countdown finishes, before the transmission time started, if channel busy detected, do not participate in letterRoad is multiplexing, finishes multiplex process, proceeds step S101, channel energy is detected. In the time channel idle being detected,Determine back off time. From above-mentioned, in the time having determined the transmission time started, after countdown finishes, LAA base station does not account forWhile using channel, if channel busy detected, do not participate in this channel multiplexing process, avoided WiFi website to cause interference,Make multiplex process more friendly, more fair.
In another embodiment of the present invention, in the embodiment of the method shown in Fig. 1, also comprised, according to a upper transmission cycleThe duration of middle contention window, the confirmation message number obtaining after transfer of data and CW i + 1 = CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine the duration of contention window in the current transmission cycle, wherein CWiFor the duration of contention window in the upper transmission cycle, CWi+1For working asThe duration of contention window in the front transmission cycle, α sent the confirmation message obtaining after intraframe data transmission in the upper transmission cycleQuantity and send the ratio of the sub-frame number in frame in this transmission cycle. Contention window is the integer between 16～1024. In realityIn application, in the time that LAA access channel carries out transfer of data, in order further to ensure the fairness of WiFi access channel, at thisIn bright embodiment, according to the confirmation message number obtaining in the upper cycle, the size of contention window is adjusted, then from 0～competingStrive between window and choose at random a numerical value, determine back off time according to this numerical value. Therefore, change the value of contention window, can adjust and move backKeep away the span of time.
In the present embodiment, the confirmation message number obtaining after transfer of data in the upper transmission cycle can reflect user'sData receiver situation and channel quality. In the time of 0≤α < 0.6, the confirmation obtaining after transfer of data in the transmission cycle is describedMessage number is less, and LAA base station carries out having the LAA base station of WiFi or other operators also taking letter in the channel of transfer of dataRoad, channel quality is poor, can extend, to delay LAA base station access letter thereby the contention window of LAA base station should double back off timeRoad; In the time of 0.9≤α≤1, show that the confirmation message number obtaining after transfer of data in the transmission cycle is more, LAA base stationCarry out not having in the channel of transfer of data the LAA base station busy channel of WiFi or other operators, or data biography is carried out in LAA base stationIn defeated channel the time of the LAA base station busy channel of WiFi or other operators shorter, channel quality is better, contention window should subtractThereby half back off time can shorten, to accelerate LAA base station's access channel. Like this, can improve the effect of LAA station data transmissionRate, promotes service quality, takes into account again the fairness coexisting in process with WiFi website.
Referring to Fig. 6 a, this figure is the flow process of the channel multiplexing method of the another kind of unauthorized frequency range that provides of the embodiment of the present inventionSchematic diagram, specifically comprises the steps:
Step S601: in the time there is data to be transmitted, in the detection frame in the cycle of transmission, channel energy is detected. ItsIn, the transmission cycle comprises that one is detected frame, a transmission frame and a blank frame.
Step S602: in the time channel idle being detected, determine back off time, and start data biography based on described back off timeDefeated countdown.
Step S603: before countdown finishes, if channel busy detected, freeze described countdown, when againWhen channel idle detected, the described countdown of thawing.
Step S604: before described countdown finishes, obtain the demand signalling of described back off time if receive, send outSend described back off time, execution step S605.
Step S605: when demand signalling and the first transmission that the participation channel multiplexing that other LAA base stations send detected are openedWhen time beginning, execution step S606.
Step S606: after countdown finishes, before the first transmission time started, whether busyly detect channel, ifChannel busy detected, perform step S601; If channel busy do not detected, perform step S607.
Step S607: adopt transmission frame to carry out transfer of data in described the first transmission time started, execution step S612.
Step S608: before countdown finishes, obtain the demand signalling of described back off time if do not receive, or do not haveThe demand signalling of the participation channel multiplexing of other LAA base stations transmissions detected, in the time that described countdown finishes, to other LAABase station sends the demand signalling of the back off time that obtains other LAA base stations, execution step S609.
Step S609: the back off time returning according to other LAA base stations, according to preset rules, determine current participation channelMultiplexing LAA base station and the second transmission time started, and to the multiplexing request of each LAA base station transmitting channel of participating in channel multiplexingSignaling and the second transmission time started, execution step S610.
Step S610: after countdown finishes, before the second transmission time started, whether busyly detect channel, ifChannel busy detected, perform step S601; If channel busy do not detected, perform step S611.
Step S611: adopt transmission frame to carry out transfer of data in described the second transmission time started, execution step S612.
Step S612: according to the duration of contention window in the transmission cycle, the confirmation message number obtaining after transfer of data andDefault formula CW i + 1 = { CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine contention window in the next transmission cycle timeLong. Wherein CWi+1For the duration of contention window in the next one transmission cycle, CWiFor the duration of contention window in the current transmission cycle, α isIn the current transmission cycle, send the confirmation message number obtaining after intraframe data transmission and send the son in frame in this transmission cycleThe ratio of number of frames. Contention window is the integer between 16～1024.
From foregoing, in the time that a LAA base station detects that channel idle and countdown finish, and other LAAAt definite common multipling channel of transmission time started, realize multiplexing between multiple LAA of same operator, improve letterThe multiplexing efficiency in road. Meanwhile, the Channel Detection process of LAA base station and the adjustment process of avoidance mechanism and contention window are effectively avoidedInterference to WiFi, make LAA base station utilize unauthorized band transmissions data age rate higher, more friendly.
Below by an example, then the present invention is described in detail, and detailed process as shown in Figure 6 b.
Supposing, there is data to be transmitted in 3 LAA base stations, represents three LAA base stations, 3 respectively with LAA1, LAA2, LAA3The initial contention window of individual LAA base station is 32. The duration that sends frame is 10ms, and the duration of blank frame is 1ms.
Stage 1:LAA1, LAA2, LAA3 all detect channel, and WiFi is also detecting channel simultaneously. Now 3 LAA base station inspectionsMeasuring channel idle, is respectively 100 μ s according to the definite back off time of contention window, 180 μ s, and 280 μ s, and based on this back off timeStart countdown.
LAA1 leads FEFO countdown, and therefore LAA1 is sent and obtains current back off time to LAA2 and LAA3 by X2 interfaceDemand signalling; Two back off times that the LAA2 that LAA1 obtains and LAA3 return are respectively 80 μ s and 180 μ s, according to default rule, find out the median of the back off time of LAA2, LAA3, in this example, have two medians, can get its mean value asWhole median, i.e. (80+180)/2=130 μ s. The LAA2 that back off time is less than to median 130 μ s is defined as current participationThe LAA base station of channel multiplexing, and to the multiplexing demand signalling of LAA2 transmitting channel and transmission time started T, T gets current participation channelThe mean value of the back off time of multiplexing all LAA, starts to transmit data after (0+80)/2=40 μ s.
LAA1 waits for, LAA2 and LAA3 continue countdown, and when the time of advent is when T, LAA1 transmits data, and LAA2 countdown is straightConnect and make zero and transmit data, start multipling channel. LAA3 does not participate in channel multiplexing, continues to detect channel. As LAA1 and LAA2When multipling channel, LAA3 detects channel busy, therefore freeze countdown.
WiFi detects channel busy, does not transmit data.
Stage 2: in the time that LAA1 and LAA2 multipling channel finish, LAA3 detects channel idle, the countdown of thawing. LAA1 andAfter LAA2 transmission ED, enter the blank frame stage. During this period of time, WiFi detects channel idle and transmits data. WhenWhen WiFi transmission data, LAA3 detects channel busy, freezes again countdown.
Due to LAA1 and LAA2 multipling channel, the process of its transfer of data influences each other. The confirmation message that LAA1 receivesQuantity is 0.8, the LAA2 confirmation message number receiving and the subframe sending in frame with the ratio that sends the sub-frame number in frameThe ratio of quantity is 0.5, and in the next one transmission cycle of LAA1 and LAA2, it is 32 constant that the contention window of LAA1 keeps, LAA2Contention window be adjusted into 64 by original 32.
Stage 3:WiFi transmits ED. LAA3 detects channel idle, and the countdown of thawing, now when the keeping out of the way of LAA3Between be 60 μ s. Meanwhile, LAA1 and LAA2 detect channel idle in the new transmission cycle, respectively the competition based on separatelyWindow 32 and 64, determines that back off time is respectively 120 μ s and 440 μ s.
LAA3 leads FEFO countdown, and sends the request of obtaining current back off time by X2 interface to LAA1 and LAA2Signaling; Two back off times that the LAA1 that LAA3 obtains and LAA2 return are respectively 60 μ s and 380 μ s, according to preset rules, look forGo out the median of the back off time of LAA1, LAA2, have two medians herein, can get its mean value as final metaNumber, i.e. (60+380)/2=220 μ s. The LAA1 that back off time is less than to median 220 μ s is defined as current participation channel multiplexingLAA base station, and to LAA1 transmitting channel multiplexing demand signalling and transmission time started T ', T ' gets current participation channel multiplexingThe mean value of the back off time of all LAA, starts to transmit data after (0+60)/2=30 μ s.
LAA3 waits for, LAA1 and LAA2 continuation countdown, and when arriving T ' time, LAA3 transmits data, and LAA1 countdown is directMake zero and transmit data, starting multipling channel. LAA2 does not participate in channel multiplexing, continues to detect channel. When LAA3 and LAA1 multipleDuring with channel, LAA2 detects channel busy, therefore freeze countdown.
Due to LAA3 and LAA1 multipling channel, the process of its transfer of data influences each other. The confirmation message that LAA1 receivesQuantity is 0.9, the LAA3 confirmation message number receiving and the subframe sending in frame with the ratio that sends the sub-frame number in frameThe ratio of quantity is 1. According to these numerical value, in the next transmission cycle, the contention window of LAA3 and LAA1 all reduces by half, LAA3 andThe contention window of LAA1 is adjusted into 16 by original 32. Data transmission procedure is afterwards identical with foregoing description, here no longerRepeat.
Be understandable that, in Fig. 6 b, for LAA1 and LAA2, stage 1 and stage 2 form one and send weekPhase, wherein, the stage 1, the stage 2 was corresponding to the blank frame of LAA1 and LAA2 corresponding to the detection frame and transmission frame of LAA1 and LAA2.For LAA3, stage 1, stage 2 and stage 3 are corresponding to the detection frame in the transmission cycle and send frame.
From foregoing, in the time that a LAA base station detects that channel idle and countdown finish, to other LAAChannel multiplexing request is sent in base station, then determines according to the back off time of other LAA LAA base station and the transmission of participating in channel multiplexingTime started. Transfer of data is carried out in definite transmission time started in this LAA base station and other LAA base stations simultaneously, has realized sameMultiple LAA base station of one operator is at the channel multiplexing of unauthorized frequency range. Meanwhile, in the present embodiment, back off time is lessLAA base station is defined as participating in the LAA of channel multiplexing, using participate in channel multiplexing LAA base station back off time mean value asThe transmission time started, has reduced the stand-by period, has improved the efficiency of transfer of data.
Referring to Fig. 7, this figure is that the structure of the channel multiplexing device of a kind of unauthorized frequency range of providing of the embodiment of the present invention is shownIntention, corresponding with embodiment of the method shown in Fig. 1, described device comprises:
, in the time there is data to be transmitted, sending in the detection frame in cycle channel energy in Channel Detection module 701Detect.
Wherein, the transmission cycle comprises that one is detected frame, a transmission frame and a blank frame.
Particularly, the duration that interior WiFi website of transmission cycle carries out the blank frame of transfer of data is not less than transmission frame duration5%, send frame duration between 1ms～10ms.
Countdown module 702, in the time channel idle being detected, determines back off time, and based on described back off timeStart transfer of data countdown.
Back off time sending module 703, before finishing in described countdown, obtains described back off time if receiveDemand signalling, send described back off time.
The first transport module 704, for when detect the participation channel multiplexing that other LAA base stations send demand signalling andWhen the first transmission time started, adopt transmission frame to carry out transfer of data in described the first transmission time started.
Back off time is asked for module 705, if obtain the demand signalling of described back off time or not inspection for not receivingMeasure the demand signalling of the participation channel multiplexing of other LAA base stations transmissions, in the time that described countdown finishes, to other LAA basesStand and send the demand signalling of the back off time that obtains other LAA base stations.
The second transport module 706, for the back off time returning according to other LAA base stations, according to preset rules, determines and works asThe LAA base station of front participation channel multiplexing and the second transmission time started, and send letter to each LAA base station of participating in channel multiplexingThe multiplexing demand signalling in road and the second transmission time started; Adopt transmission frame to carry out data biography in described the second transmission time startedDefeated.
In another embodiment of the present invention, in the device embodiment shown in Fig. 7, also comprise that countdown freezes module(not shown).
Module is freezed in described countdown, if channel busy detected before finishing in countdown, described in freezingCountdown, in the time again channel idle being detected, the described countdown of thawing.
In another embodiment of the present invention, in the device embodiment shown in Fig. 7, also comprise multiplexing end module (figureIn not shown).
Described multiplexing end module, for after countdown finishes, the first transmission time started or the second transmission startBefore time, if channel busy detected, finish the letter in described the first transmission time started or the second transmission time startedRoad multiplex process, repeats the step in the detection frame in the cycle of transmission, channel energy being detected.
In another embodiment of the present invention, in the device embodiment shown in Fig. 7, also comprise contention window determination module(not shown).
Described contention window determination module, for according to the duration of a upper transmission cycle contention window, obtains after transfer of dataConfirmation message number and CW i + 1 = { CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine in the current transmission cycle competingStrive the duration of window, wherein CWiFor the duration of contention window in the upper transmission cycle, CWi+1For contention window in the current transmission cycleDuration, α sent the confirmation message number obtaining after intraframe data transmission and sends out in this transmission cycle in the upper transmission cycleSend the ratio of the sub-frame number in frame.
Referring to Fig. 8, this figure is the structure of the channel multiplexing device of the another kind of unauthorized frequency range that provides of the embodiment of the present inventionSchematic diagram, in this device, Channel Detection module 801, countdown module 802, back off time sending module 803, the first transmission modePiece 804, back off time ask for module 805 respectively with Fig. 7 in Channel Detection module 701, countdown module 702, back off timeIt is identical that sending module 703, the first transport module 704, back off time are asked for module 705, do not repeat them here. The second transport module806 specifically can comprise:
Recognin module 8061, for the back off time returning according to other LAA base stations, described other LAA base stations of identificationThe median of back off time;
Determine submodule 8062, for back off time being less than to other LAA base stations of described median, be defined as current ginsengAdd the LAA base station of channel multiplexing.
The embodiment of the method that is the channel occupancy based on unauthorized frequency range due to said apparatus embodiment obtains, with the partyMethod has identical technique effect, and the technique effect that therefore installs embodiment does not repeat them here.
For device embodiment, because it is substantially similar in appearance to embodiment of the method, thus describe fairly simplely, relevantPart is referring to the part explanation of embodiment of the method.
It should be noted that, in this article, the relational terms such as the first and second grades is only used for a realityBody or operation separate with another entity or operating space, and not necessarily require or imply these entities or operate between depositIn relation or the order of any this reality. And term " comprises ", " comprising " or any other variant are intended to contain non-Comprising of exclusiveness, thus make to comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements,But also comprise other key elements of clearly not listing, or be also included as this process, method, article or equipment and consolidateSome key elements. The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within and compriseIn process, method, article or the equipment of described key element, also there is other identical element.
One of ordinary skill in the art will appreciate that, all or part of step in above-mentioned embodiment is to pass through journeyThe hardware that order instruction is relevant completes, and described program can be stored in computer read/write memory medium. Here allegedStorage medium, refers to ROM/RAM, magnetic disc, CD etc.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention. AllAny amendment of making within the spirit and principles in the present invention, be equal to replacement, improvement etc., be all included in protection scope of the present inventionIn.

Claims (10)

1. a channel multiplexing method for unauthorized frequency range, is characterized in that, is applied to authorize to assist access LAA base station, comprising:
In the time there is data to be transmitted, in the detection frame in the cycle of transmission, channel energy is detected; Wherein, send periodic packetsDraw together one and detect frame, a transmission frame and a blank frame;
In the time channel idle being detected, determine back off time, and start transfer of data countdown based on described back off time;
Before described countdown finishes, obtain the demand signalling of described back off time if receive, while keeping out of the way described in sendingBetween;
In the time detecting that the demand signalling and first of the participation channel multiplexing that other LAA base stations send transmits the time started, in instituteState the first transmission time started employing transmission frame and carry out transfer of data;
Obtain the demand signalling of described back off time if do not receive or the participation channel that other LAA base stations send do not detectedMultiplexing demand signalling, in the time that described countdown finishes, while obtaining keeping out of the way of other LAA base stations to other LAA base stations transmissionsBetween demand signalling;
The back off time returning according to other LAA base stations, according to preset rules, determines the LAA base station of current participation channel multiplexingAnd second transmission the time started, and to participate in channel multiplexing the multiplexing demand signalling of each LAA base station transmitting channel and second passThe defeated time started; Adopt transmission frame to carry out transfer of data in described the second transmission time started.
2. method according to claim 1, is characterized in that, described method also comprises:
If channel busy detected before countdown finishes, freeze described countdown, when channel idle again being detectedTime, the described countdown of thawing.
3. method according to claim 2, is characterized in that, described method also comprises:
After countdown finishes, before the first transmission time started or the second transmission time started, if channel busy detected,Finish the channel multiplexing process in described the first transmission time started or the second transmission time started, repeat in the cycle of transmissionDetect the step in frame, channel energy being detected.
4. according to the method described in claim 1 or 2 or 3, it is characterized in that, described method also comprises:
According to the duration of contention window in the upper transmission cycle, the confirmation message number obtaining after transfer of data and CW i + 1 = CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine the duration of contention window in the current transmission cycle, wherein CWiForThe duration of contention window in the upper transmission cycle, CWi+1For the duration of contention window in the current transmission cycle, α is upper one and sends weekIn the confirmation message number obtaining after the transmission of interim transmission intraframe data and this transmission cycle, send the ratio of the sub-frame number in frameValue.
5. method according to claim 1, is characterized in that, the described back off time returning according to other LAA base stations, pressesAccording to preset rules, determine the LAA base station of current participation channel multiplexing, comprising:
The back off time returning according to other LAA base stations, the median of described other LAA base station back off times of identification;
Back off time is less than to other LAA base stations of described median, is defined as the LAA base station of current participation channel multiplexing.
6. method according to claim 1, is characterized in that, described method also comprises:
The duration that interior WiFi website of transmission cycle carries out the blank frame of transfer of data is not less than 5% of transmission frame duration, sends frameDuration is between 1ms～10ms.
7. a channel multiplexing device for unauthorized frequency range, is characterized in that, is applied to authorize to assist access LAA base station, comprising:
Channel Detection module in the time there is data to be transmitted, is examined channel energy in the detection frame in the cycle of transmissionSurvey; Wherein, the transmission cycle comprises that one is detected frame, a transmission frame and a blank frame;
Countdown module, in the time channel idle being detected, determines back off time, and starts data based on described back off timeTransmission countdown;
Back off time sending module, before finishing in described countdown, the request of obtaining described back off time if receiveSignaling, sends described back off time;
The first transport module, for passing when the demand signalling and first that the participation channel multiplexing that other LAA base stations send detectedWhen the defeated time started, adopt transmission frame to carry out transfer of data in described the first transmission time started;
Back off time is asked for module, if obtain the demand signalling of described back off time or do not detect other for not receivingThe demand signalling of the participation channel multiplexing that LAA base station sends,, in the time that described countdown finishes, sends and obtains to other LAA base stationsGet the demand signalling of the back off time of other LAA base stations;
The second transport module, for the back off time returning according to other LAA base stations, according to preset rules, determines current participationThe LAA base station of channel multiplexing and the second transmission time started, and multiplexing to each LAA base station transmitting channel of participating in channel multiplexingDemand signalling and the second transmission time started; Adopt transmission frame to carry out transfer of data in described the second transmission time started.
8. device according to claim 7, is characterized in that, described device also comprises that countdown freezes module;
Module is freezed in described countdown, if channel busy detected before finishing in countdown, freezes described meterTime, in the time again channel idle being detected, the described countdown of thawing.
9. according to the device described in claim 7 or 8, it is characterized in that, described device also comprises contention window determination module;
Described contention window determination module, for according to the duration of a upper transmission cycle contention window, obtains after transfer of dataConfirmation message quantity and CW i + 1 = CW i &times; 2 , 0 &le; &alpha; < 0.6 CW i , 0.6 &le; &alpha; < 0.9 CW i / 2 , 0.9 &le; &alpha; &le; 1 , Determine contention window in the current transmission cycleDuration, wherein CWiFor the duration of contention window in the upper transmission cycle, CWi+1For contention window in the current transmission cycle timeLong, α sent the confirmation message number obtaining after intraframe data transmission and sends in this transmission cycle in the upper transmission cycleThe ratio of the sub-frame number in frame.
10. device according to claim 7, is characterized in that, described the second transport module comprises;
Recognin module, for the back off time returning according to other LAA base stations, described other LAA base station back off times of identificationMedian;
Determine submodule, for back off time being less than to other LAA base stations of described median, be defined as current participation channel multipleWith LAA base station.
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