CN105592467A

CN105592467A - Method and equipment for competing channel resource in long term evolution communication system

Info

Publication number: CN105592467A
Application number: CN201510232515.9A
Authority: CN
Inventors: 李迎阳; 孙程君
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2014-11-07
Filing date: 2015-05-08
Publication date: 2016-05-18
Also published as: WO2016072778A1

Abstract

The invention discloses LTE equipment used for performing clear channel assessment (CCA) detection within a channel bandwidth on a license-free frequency band, the LTE equipment decides whether to carry out data transmission according to a clear channel state detected in the channel bandwidth accordingly. The invention further discloses a method, which supports channel state detection on the license-free frequency band, and distinguishes signal energy of an LTE system and other wireless systems, thereby improving performance of the LTE system.

Description

The method and apparatus of competitive channel resource in Long Term Evolution communication system

Technical field

The present invention relates to wireless communication system, relate in particular in a kind of Long Term Evolution (LTE) communication systemThe method and apparatus of competitive channel resource.

Background technology

Long Term Evolution (LTE) communication system of 3GPP standardization body support FDD (FDD) andTwo kinds of duplex modes of time division duplex (TDD). As shown in Figure 1, the FDD that Fig. 1 is prior art withoutLine frame structure schematic diagram, to FDD system, the length of each radio frames is 10ms, comprises 10 lengthFor the subframe of 1ms. Wherein, the time slot that subframe is 0.5ms by two continuous length forms, i.e. kIndividual subframe comprises time slot 2k and time slot 2k+1. As shown in Figure 2, the TDD that Fig. 2 is prior artWireless frame structure schematic diagram, to TDD system, the radio frames of each 10ms is divided into two length and isThe field of 5ms. Wherein, each field comprises subframe and 3 special domain that 8 length are 0.5ms,Be descending pilot frequency time slot (DwPTS), protection interval (GP) and uplink pilot time slot (UpPTS),The length of these 3 special domain and be 1ms. Each subframe is made up of two continuous time slots, kSubframe comprises time slot 2k and time slot 2k+1. A downlink transfer time interval (TTI) is defined in oneIn individual subframe.

In the time that TDD radio frames is configured, support 7 kinds of upstream and downstream configurations, as shown in table 1.Here, D represents descending sub frame, and U represents sub-frame of uplink, and S represents the above-mentioned spy who comprises 3 special domainDifferent subframe.

Table 1

Front n OFDM (OFDM) symbol of each descending sub frame can be descending for transmittingControl information, Downlink Control Information comprises Physical Downlink Control Channel (PDCCH, PhysicalAnd other control information DownlinkContolChannel), wherein, n equal 0,1,2,3 or4; Remaining OFDM symbol can be used for transmitting physical DSCH Downlink Shared Channel (PDSCH, PhysicalDownlinkSharedChannel) or strengthen PDCCH (EPDCCH). In LTE system,PDCCH and EPDCCH carrying distribute the descending control letter of uplink channel resources or down channel resourcesBreath (DCI, DownlinkControlInformation), is called downstream grants signaling (DLGrant)And uplink authorization signaling (ULGrant). In LTE system, the DCI of different user devices (UE)Be independent transmission respectively, and DLGrant wherein and ULGrant are independent transmissions respectively.

In the enhancing system of LTE system, be to obtain more by combining multiple unit carrier wave (CC)Large bandwidth of operation, adopts carrier aggregation (CA) to form downlink and the uplink of communication systemRoad, thus higher transfer rate supported. Here the CC condensing together, both can adopt identicalDuplex mode, Quan Shi FDD community or Quan Shi TDD community, also can adopt different duplex sides, there is HeTDD community, FDD community in formula simultaneously. To a UE, base station can configure it manyIn individual Cell, work, one of them is main Cell (Pcell), and other Cell is called time Cell (Scell).To LTECA system, based on Physical Uplink Control Channel (PUCCH, PhysicalUplinkContolChannel) the mixed automatic retransfer request of transmission response (HARQ-ACK) and channel condition information (CSI)Only on Pcell, carry out.

Above LTE system is generally deployed in licensed band, can avoid the interference of other system. RemoveBeyond licensed band, exempt from addition licensed band. Exempting from licensed band has generally divided and has been used in certain other useOn the way, for example, WLAN (WiFi) system of radar system and/or 802.11 series. 802.11The WiFi system of series accesses/conflicts the machine-processed work of avoiding (CSMA/DA) based on carrier sense multipleDo, a travelling carriage (STA) must detect wireless channel before transmitted signal, only had when wirelessChannel idle also keeps just can taking this wireless channel transmitted signal after regular hour section. STA canAdopt two cover mechanism jointly to judge radio channel state to combine. On the one hand, STA can adopt carrier wave to detectListen the detection wireless channel that technology (CarrierSensing) is actual, when the signal of other STA being detectedOr the signal power detecting exceedes while setting thresholding, confirm that wireless channel is busy. At this moment, this STAIn the physical layer block channel idle of reporting to its high-rise module estimate (CCA, ClearChannelAssessment) examining report instruction wireless channel is busy. On the other hand, the WiFi system of 802.11 seriesAlso introduced virtual carrier sensing in wireless network communication technology, i.e. system assignment vector (NAV), in each 802.11 framesAll comprised duration (duration) territory, the NAV value arranging according to duration field is confirmed can notTransmitted signal on wireless channel, NAV is the time that instruction need to be reserved wireless channel.

Concerning LTE system, the demand increasing in order to meet service of mobile communication, needs to excavate moreMany frequency spectrum resources. A possible solution exempting from licensed band deploy LTE system. ByGenerally divide and be used in certain other purposes in exempting from licensed band, exempted from licensed band deploy LTEWhen system, its interference level has uncertainty, and this causes the quality of service of LTE system transmission data(QoS) be generally relatively difficult to ensure, but or can be not high for qos requirement exempting from licensed bandTransfer of data. In this case, how to reduce and even to avoid exempting from licensed band LTE as far as possibleThe signal of system disturbs a problem demanding prompt solution that becomes industry.

Summary of the invention

In view of this, main purpose of the present invention is to provide competitive channel resource in a kind of LTE communication systemMethod and relevant device, exempt from licensed band, the signal of LTE system to be disturbed to be reduced in, and improves LTE systemThe communication performance of system.

Technical scheme of the present invention is achieved in that

A method for competitive channel resource in Long Term Evolution LTE communication system, comprising:

LTE equipment carries out channel idle and estimates that CCA detects in a channel width exempting from licensed band;

LTE equipment, according to the channel clear detecting in above-mentioned channel width, determines whether countReportedly defeated, wherein: in the time that described channel clear meets predetermined idle determination condition, take corresponding letterRoad carries out transfer of data.

In a kind of preferred embodiment, describedly in a channel width exempting from licensed band, carry out CCA detection,Specifically comprise: the signal dissimilar to N kind carries out respectively CCA detection; Described full in channel clearWhen sufficient predetermined idle determination condition, take respective channel and carry out transfer of data, specifically comprise: according in advanceSet N CCA detection threshold value, the CCA measured value of the signal of comprehensive above-mentioned N type and withThe comparison of CA detection threshold separately, judges whether LTE equipment can busy channel.

In a kind of preferred embodiment, in the time of described N=2, describedly exempting from a channel width of licensed bandInside carry out CCA detection, specifically comprise: detect respectively the energy E from LTE system_LAAWith other energyE_others; In the time that described channel clear meets predetermined idle determination condition, take respective channel numberReportedly defeated, specifically comprise: the energy from LTE system and other energy are adopted respectively to different detecting gatesLimit judges channel busy-idle condition; Work as E_othersBe less than Th_others, and E_LAABe less than Th_LAATime, LTE establishesStandby busy channel carries out transfer of data; Wherein, described Th_LAAAnd Th_others; For predefined CCA inspectionSurvey threshold value.

In a kind of preferred embodiment, in the time of described N=3, describedly exempting from a channel width of licensed bandInside carry out CCA detection, specifically comprise: detect respectively from the same operator of described LTE equipmentThe energy E of LTE system_intra, from the energy of the LTE system of described LTE equipment Bu Shiyige operatorE_interWith other energy E_others; Described idle determination condition comprises three CCA detection threshold value, respectivelyBe designated as Th_intra、Th_interAnd Th_others; In the time that described channel clear meets predetermined idle determination condition,Take respective channel and carry out transfer of data, specifically comprise: to the energy of the LTE system from same operatorAmount E_intra, from the energy E of the LTE system of other operator_interWith other energy E_othersAdopt not respectivelySame detection threshold judges channel busy-idle condition; Work as E_othersBe less than Th_others，E_interBe less than Th_interTime,And E_intraBe less than Th_intraTime, LTE hold facility channel carries out transfer of data; Described Th_intra、Th_interAnd Th_othersFor predefined three CCA detection threshold value.

In a kind of preferred embodiment, describedly in a channel width exempting from licensed band, carry out CCADetect, be specially on all time resources and detect channel status; Described time resource is alternately divided into the timeSection A and time period B; Whether described decision carries out transfer of data, specifically comprises:

When detecting the channel status spare time and meet the condition of channel status LBT on time period A, LTE establishesStandby busy channel carries out transfer of data;

When detecting the channel status spare time but do not meet the condition of LBT on time period A, LTE equipment existsIn time period B, directly suspend LBT operation;

Or, when detecting the channel status spare time but do not meet the condition of LBT on time period A, in the timeIn section B, LTE equipment continues to detect channel status, upgrades LBT counter status until LBT countingDevice makes zero.

In a kind of preferred embodiment, to time period A described in each, always restart LBT behaviourDo;

Or, to time period A described in each, if LBT counter makes zero, restart LBTOperation; If LBT counter does not make zero, continue to carry out previous LBT operation.

In a kind of preferred embodiment, describedly in a channel width exempting from licensed band, carry out CCADetect, be specially on all time resources and detect channel status, described time resource is alternately divided into the timeSection A and time period B; LTE equipment is on each orthogonal frequency division multiplex OFDM symbol of time period ADetect respectively channel status, when channel idle detected on n OFDM symbol time, from n+1Individual OFDM sign-on busy channel carries out transfer of data.

In a kind of preferred embodiment, in the time channel idle being detected and meet LBT condition, LTE equipmentThe targeting signal that transmission comprises known array; Described targeting signal is made up of basic sequence; Described basic orderThe length of row equals the length of an OFDM symbol, or the length of described basic sequence equalsCCA detects the length of section observing time.

In a kind of preferred embodiment, in the time channel idle being detected and meet LBT condition, LTE equipmentThe targeting signal that transmission comprises known array; The time domain mapping of described targeting signal is done with a set time pointFor relative reference time point; Be mapped to the position in LTE subframe according to targeting signal delivery time, leadingThe start-stop timing of the OFDM symbol of signal and OFDM symbol aligned corresponding in subframe.

In a kind of preferred embodiment, in the time channel idle being detected and meet LBT condition, LTE equipmentThe targeting signal that transmission comprises known array; And the method further comprises:

A LTE equipment only sends described targeting signal on a comb, and described comb is described LTEOne of multiple combs of in communication system, the subcarrier in whole LTE bandwidth being divided;

Or, LTE equipment only in send described targeting signal, described one group of son on one group of subbandBand is one of many groups subband distributing in whole LTE bandwidth in described LTE communication system, described everyOne group of subband is distributed in system bandwidth.

In a kind of preferred embodiment, in the time channel idle being detected and meet LBT condition, LTE equipmentThe targeting signal that transmission comprises known array; The method also comprises:

An overall targeting signal sequence is set, to a CF, the described targeting signal of its mappingSequence fragment be a fixing part in described overall targeting signal sequence.

In a kind of preferred embodiment, targeting signal can be complete by one or more LTE systemWhole OFDM symbol composition, can be at an OFDM symbol if meet the moment of channel occupancy conditionOriginal position, cut out the meeting before Channel holding time of first OFDM symbol of targeting signalPart.

In a kind of preferred embodiment, p OFDM symbol before the A part of targeting signal is corresponding, onlyIn every N subcarrier, take 1 subcarrier and send basic sequence A, and other N-1 subcarrierDo not send any signal, N is integer, and p is only for sending the OFDM number of symbols of basic sequence A.

In a kind of preferred embodiment, the B part of targeting signal is corresponding to p+1 OFDM symbolThe follow-up OFDM symbol starting, specifically comprises:

B part is independent of downlink data transmission;

Or B part is supported transmission demodulated reference signal and/or downlink data.

In a kind of preferred embodiment, the B part of targeting signal is supported transmission demodulated reference signal, concreteComprise:

If the OFDM symbol in its corresponding LTE subframe need to shine upon CRS, targeting signal existsIn identical sub-carrier positions, send CRS;

The information that is mapped to fixing sub-carrier positions of targeting signal can only be mapped to and not comprise CRS'sOn OFDM symbol;

If the OFDM symbol in its corresponding LTE subframe need to shine upon DMRS, targeting signalIn identical sub-carrier positions, send DMRS;

The information that is mapped to fixing sub-carrier positions of targeting signal can only be mapped to OFDM symbolDo not comprise on the RE of DMRS.

In a kind of preferred embodiment, targeting signal is divided into A part and B part, specifically comprises:

The OFDM symbol that B part comprises fixed data, and the OFDM symbolic number of A part relies onSeize the timing position of channel in base station and change;

Or, the OFDM symbol that A part comprises fixed data, and the OFDM symbol of B partNumber depends on base station and seizes the timing position of channel and change.

A part and the B part of the targeting signal of other base stations detected in base station;

UE detects the B part of targeting signal, or only comes according to the minimum OFDM symbolic number of B partDetect B part, or detect A part and detect B part according to the minimum duration of A part.

In a kind of preferred embodiment, all or a part of OFDM symbol of the B part of targeting signalOn number, the structure of mapping targeting signal is fixed.

In a kind of preferred embodiment, described LTE equipment carries out CCA detection and specifically comprises: distinguish notThe energy of signal of the same type carries out respectively CCA detection, obtains the energy of signal with different type.

In a kind of preferred embodiment, the energy of described differentiation signal with different type carries out respectively CCA inspectionSurvey, the energy that obtains signal with different type specifically comprises:

Obtain the energy of LTE signal by detecting targeting signal, use the total signal energy detecting to deductThe energy of above-mentioned LTE signal, using approximate this difference as the energy from other wireless system and otherThe energy of the LTE system that can not identify.

Or, detecting after the energy of targeting signal, extensive with the energy detecting by targeting signal sequenceMultiple this targeting signal, always receives signal and deducts the targeting signal of this recovery, the energy of residual signalApproximate conduct is from the energy of other wireless system and the energy of other the LTE system that can not identify.

On different combs, measure the signal energy of Different L TE system or other wireless system; InstituteStating comb is in the resource of measuring for channel status, and the subcarrier in whole LTE bandwidth is dividedMultiple combs;

Or, on different subbands, measure the signal energy of Different L TE system or other wireless systemAmount; Described subband is that what whole system bandwidth was divided into is many in the resource of measuring for channel statusGroup subband, described each group subband is distributed in system bandwidth.

In a kind of preferred embodiment, the method further comprises: main plot is used in the base station in LTE equipmentIndication information of upper transmission, this indication information is for notifying the UE of LTE equipment to start to detect leadingThe position of signal.

In a kind of preferred embodiment, the base station in described LTE equipment is with described in transmission on main plotAfter indication information, when channel idle and while meeting LBT condition, share if arrived physical downThe initial timing position of channel PDSCH, the base station in LTE equipment directly sends PDSCH.

In a kind of preferred embodiment, if the channel before the initial timing of PDSCH continues in shapeState is busy, and the base station in LTE equipment continues to detect channel status, and in channel idle and meet LBTWhen condition, busy channel carries out transfer of data.

In a kind of preferred embodiment, the method further comprises: main plot is used in the base station in LTE equipmentIndication information of upper transmission, this indication information is for notifying the user equipment (UE) of LTE equipment to startBlind Detecting physical downlink control channel PDCCH/enhancing Physical Downlink Control Channel EPDCCH receives downThe position of row data.

In a kind of preferred embodiment, the method further comprises:

Configure respectively and seize first subframe in channel time section by radio resource control RRC signalingInitial OFDM symbol with the PDSCH of non-the first subframe;

Or the starting position of seizing the PDSCH of first subframe after channel is fixed as the 4thOFDM symbol, and with the initial OFDM symbol of non-the first subframe of RRC signal deployment;

Or, PDSCH initial of seizing first subframe of channel time section with RRC signal deploymentOFDM symbol, and to seizing non-the first subframe after channel, fix and open from first OFDM symbolBeginning transfer of data;

Or the starting position of seizing the PDSCH of first subframe after channel is fixed as the 4thOFDM symbol, and to seizing non-the first subframe after channel, fix and open from first OFDM symbolBeginning transfer of data.

In a kind of preferred embodiment, the method further increases by 1 than refering in particular in PDCCH/EPDCCHShow information, this indication information is used to indicate according to the initial OFDM symbol of semi-static configuration and shines upon PDSCH,Or be used to indicate from first OFDM sign-on mapping PDSCH.

A kind of LTE equipment, comprising:

Channel Detection module, for carrying out channel idle estimation in a channel width exempting from licensed bandCCA detects;

Data transmission module, for according to the channel clear detecting in above-mentioned channel width, correspondingDetermine whether carry out transfer of data, wherein: meet predetermined idle determination condition in described channel clearTime, take respective channel and carry out transfer of data.

Adopt method of the present invention, LTE equipment carries out channel sky in a channel width exempting from licensed bandNot busy estimation (CCA) detects; The channel clear that LTE equipment basis detects in above-mentioned channel width,Whether corresponding decision carries out transfer of data, wherein: meet predetermined idle determination in described channel clearWhen condition, take respective channel and carry out transfer of data. Compared to existing technology, the present invention can be LTE equipmentReserved wireless channel, Mediation Device and other wireless communication system take as the frequency of WiFi system, thereby fallLow other communication system of even avoiding is disturbed the signal of LTE system, improves the communication performance of LTE system.

Brief description of the drawings

Fig. 1 is LTEFDD frame structure;

Fig. 2 is LTETDD frame structure;

Fig. 3 is the flow chart of competitive resource method in LTE communication system of the present invention;

Fig. 4 is the schematic diagram one that allocated channel detects resource;

Fig. 5 is the schematic diagram one that allocated channel detects resource;

Fig. 6 is the schematic diagram of targeting signal time domain mapping;

Fig. 7 is the schematic diagram of another targeting signal time domain mapping;

Fig. 8 is a kind of schematic diagram of targeting signal frequency domain mapping;

Fig. 9 is another kind of targeting signal frequency domain mapping schematic diagram;

In the bandwidth location that centered by Figure 10, frequency is different, reuse the signal of identical targeting signal sequenceFigure;

Figure 11 is the schematic diagram that adopts overall targeting signal sequence;

Figure 12 is a point schematic diagram for the frequency domain resource that is used in CCA;

Figure 13 is a point schematic diagram for the frequency domain resource that is used in CCA two;

Figure 14 is a point schematic diagram for the frequency domain resource that is used in CCA three;

Figure 15 is at the schematic diagram of receiving UE detection channel after Pcell indication information;

Figure 16 is receiving that UE after Pcell indication information directly sends the schematic diagram of PDSCH;

Figure 17 is the schematic diagram that base station continues to detect channel status;

Figure 18 is the one composition schematic diagram of LTE equipment of the present invention;

Figure 19 is targeting signal spatial structure schematic diagram of the present invention;

Figure 20 is the subframe structure of LTE system;

Figure 21 is the time domain mapping schematic diagram one that is mapped to the information of stator carrier position in targeting signal;

Figure 22 is the time domain mapping schematic diagram two that is mapped to the information of stator carrier position in targeting signal;

Figure 23 is the frequency domain mapping schematic diagram that is mapped to the information of stator carrier position in targeting signal.

Figure 24 is elongated targeting signal schematic diagram.

Figure 25 is the schematic diagram one of A part and the B part of elongated targeting signal.

Figure 26 is the schematic diagram two of A part and the B part of elongated targeting signal.

Detailed description of the invention

Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.

Exempt from licensed band (UnlicensedBand) above, may dispose other radio communication systemSystem, for example, radar or WiFi etc., so, need to keep away exempting from licensed band deploy LTE systemExempt from the phase mutual interference with above-mentioned other wireless system. Further, exempting from licensed band, when while portionWhile having affixed one's name to multiple LTE system, for example, described multiple LTE systems can be under the jurisdiction of respectively different fortuneThe business of battalion, like this, also needs to avoid the phase mutual interference of above-mentioned multiple LTE systems.

Exempting from licensed band, for fear of with the equipment of other LTE equipment or other wireless systemDisturb, LTE equipment needs first to detect the state of channel before transmitted signal. Only have in the time of channel idleWait really busy channel transmitted signal. For easy description, below by LTE equipment general referenceBase station in LTE and UE. Owing to exempting from licensed band, from the interference of other wireless communication systemNot controlled, so be relatively difficult to guaranteed qos. In the present invention, can make UE be operated in carrier wave poly-Close under (CA) pattern, its main plot (Pcell) is Yi Ge community in licensed band, and this Pcell usesIn the QoS that ensures UE.

Because exempting from may to have disposed multiple wireless system in licensed band, the coexisting of different wireless systemsDemand is different. For example, WiFi is that (CSMA/DA) avoided in access/conflict based on carrier sense multipleCarry out work, it requires in the time that an Equipment Inspection exceedes a thresholding to signal strength signal intensity, can not busy channel,Emphasize can only have an equipment in transmitted signal in certain scope. And to LTE system, its designOriginal intention is to coordinate base station behavior, and realizing frequency reuse is 1, and multiple base station/UE can send out simultaneouslySend data. So according to the design principle of different wireless systems, its operation principle and the demand that coexists are alsoDifferent. The present invention proposes LTE equipmentThe signal of system and the signal of other wireless system, thus correspondingly adjust the transmission of its LTE signal and connectReceive.

In the present invention, base station configuration UE is operated in CA pattern, and the LTE in licensed band is exempted from configurationCommunity is as its Yi Geci community (Scel); The signaling of UE reception base station determines whether can be above-mentionedOn Scell, carry out transfer of data. The present invention can coordinate to exempt from licensed band LTE system and other is wirelessCommunication system takies as the frequency of WiFi system, even avoids LTE system to communicate by letter with other thereby reduceThe phase mutual interference of system.

Fig. 3 is the flow chart of competitive resource method in LTE communication system of the present invention, mainly comprises:

Step 301, LTE equipment detection signal in a channel width exempting from licensed band, hereinafter referred to asIt is estimated (CCA) for channel idle and detects; Described CCA detects also can be referred to as CCA.

CCA can carry out in time domain, also can carry out at frequency domain. CCA can refer to surveyThe signal gross energy of amount in channel width, or when can identification signal sequence, CCA can be alsoRefer to detect the energy of this burst. Above-mentioned burst can identify from a wireless systemSignal, for example, exempts from the LTE system in licensed band. LTE equipment can obtain about many with CCAType the status information of signal, thereby can come corresponding according to the testing result of polytype signalSubsequent data transmission is processed on ground.

To a channel width, CCA detects in all frequencies of whole system bandwidth; Or,CCA can be also in a part of frequency being only confined in whole system bandwidth. To a kind of rear method, useCan be to be distributed in whole system bandwidth in the frequency of CCA; Or, can for the frequency of CCATo be distributed on multiple subbands of system bandwidth; Or, can be system bandwidth for the frequency of CCAA subband on all frequencies. Said system bandwidth refers in channel width can be actually used in numberReportedly defeated frequency range. For example, taking LTE system as example, in the time that its channel width is 20MHz,Its system bandwidth is about 18MHz.

Step 302, LTE equipment are according to the channel clear detecting in above-mentioned channel width, phaseShould determine whether carry out transfer of data, wherein: meet predetermined idle determination in described channel clearWhen condition, take respective channel and carry out transfer of data.

Here,, because LTE system adopts fixing frame structure, each subframe lengths is 1ms and toolHave fixing start-stop timing, and LTE device discovery channel can with moment can be more random, soLTE equipment may need to send a kind of signal for busy channel before transmission useful signal, belowBe called targeting signal. If LTE equipment did not send any letter before the timing position of its transmission dataNumber, the miscellaneous equipment that may cause channel to be exempted from licensed band is seized.

LTE equipment is exempting from licensed band, to detect channel status, and in the time channel busy being detected, Yi ZhongkeThe operation of energy produces a random numerical value of N, and LTE equipment continues to detect channel, and only at CCAWhen the number of times of detection channel idle reaches N time, could busy channel. Following said process is calledLBT process, corresponding counter is called LBT counter. The present invention describe in taking subtract counter as example,That is, it is N that LBT counting initial value is set, and each CCA subtracts LBT counter while detecting channel idle1, in the time that LBT counter makes zero, LTE equipment can busy channel. Described method is also applicable to otherMethod of equal value, for example up counter, at this time, the initial value of LBT counter is 0, Neng GouzhanReach N by the value that the condition of channel is LBT counter.

Below by eight preferred embodiments, present techniques scheme is further elaborated,

Embodiment mono-

In a channel width exempting from licensed band, may exist other LTE community and/itsThe signal of its wireless system. So, determining at a LTE equipment whether it can carry out by busy channelWhen transfer of data, need to consider to the signal of above-mentioned other LTE community and/signal of other wireless systemImpact. Because the operation principle of LTE system and other wireless system is different, can DuiLTE communitySignal and the signal of other wireless system adopt respectively different processing methods.

The present invention proposes N CCA detection threshold value to be set as idle determination condition, and is respectively used toThe CCA that processes the dissimilar signal of N kind detects. Here, N is more than or equal to 1. To each typeSignal, according to its CCA measured value and CCA detection threshold, can know current whether existenceThe signal of this type. The CCA measured value of the signal of comprehensive N type and with CA inspection separatelyThe comparison of surveying thresholding, can judge whether current LTE equipment can busy channel.

Here, the signal of above-mentioned N type can be complementary, and the signal of comprehensive N type obtainsTotal reception signal on channel, for example, can be the signal using LTE signal as a type, and withOther signals beyond LTE are as the signal of another type; Or above-mentioned N kind signal can be not yetBeing complementary relationship, for example, can be the signal using LTE signal as a type, and always to receive letterNumber as the signal of another type. The CCA measured value of remembering the signal of N type is respectively E_k, andRemember that corresponding CCA detection threshold is Th_k,, when the CCA of the signal of N type measured value all dividesWhile not being less than corresponding CCA detection threshold, meet E_kBe less than Th_k, LTE equipment just can takeChannel carries out transfer of data, and k equals 0,1 ... N-1; Otherwise LTE equipment can not busy channel.

Suppose that N equals 2. In a channel width exempting from licensed band, suppose the CCA of LTE equipmentOperation can distinguish from the energy of LTE system and other energy, is designated as respectively E_LAAAnd E_others。Here can be the total of the signal from LTE system in this bandwidth from the energy of LTE system,Energy; Or, can be the gross energy of those discernible signals from LTE system; Or, canTo be the gross energy from the signal of the LTE system of same operator; Or, can be that those can be knownOther is from the gross energy of the signal of the LTE system of same operator.

Described other energy can be the gross energy from other wireless system in this bandwidth; Or,Can be from the energy of other wireless system and the energy of some the LTE systems that can not identify; Or,Can be from the energy of the LTE system of other operator with from the gross energy of other wireless system; OrPerson, can be from the energy of the LTE system of other operator, from the energy of other wireless system andThe energy of some the LTE systems that can not identify. A kind of typical situation is that above-mentioned k kind is true when adoptingWhen the method for the fixed energy from LTE system, correspondingly adopt above-mentioned k kind to determine the side of other energyMethod. But the present invention does not limit and must adopt such corresponding relation.

Adopt respectively different detection threshold to judge letter to the energy from LTE system and other energyRoad busy-idle condition, is set in advance as respectively Th_LAAAnd Th_others. As CCA detected value E_othersLower than doorLimit Th_othersTime, can think not exist the restriction that coexists with other wireless system; When CCA detectsValue E_LAALower than thresholding Th_LAATime, can think a LTE equipment around in closer scope notExist other sending the LTE equipment of data.

In general, for thresholding Th_othersThan thresholding Th_LAAStricter. , wireless from otherAs long as the signal strength signal intensity of system reaches a lower value, LTE equipment just should be avoided busy channel,Thereby prevent the interference of the signal to other wireless system; And to the signal from LTE system, becauseThe design object of LTE system is that frequency reuse is 1, it specification the raising frequency of some rowThe method of multiplexing efficiency, only has in the time that the signal from other LTE system is more intense LTE equipmentJust should busy channel.

The following describes that the present invention processes from the signal of LTE system according to different CCA detection threshold andFrom the method for the signal of other wireless system.

Work as E_othersBe less than Th_others, and E_LAABe less than Th_LAATime, LTE equipment can busy channelCarry out transfer of data;

Work as E_othersEqual or exceed thresholding Th_others, or, E_LAAEqual or exceed thresholding Th_LAATime, LTE equipment can not busy channel. At this moment, if E_othersBe less than Th_others, be to have avoided itThe interference of the signal of its wireless system; If E_LAABe less than Th_LAA, be to have avoided other LTE systemInterference; If E_othersAnd E_LAAAll equal or exceed thresholding, be to have avoided other LTE simultaneouslyThe interference of system and other wireless system.

Embodiment bis-

Corresponding embodiment mono-arranges N CCA detection threshold value as idle determination condition, and respectivelyThe method detecting for the treatment of the CCA of the dissimilar signal of N kind, describes N and equals in 3 situationAn example. Suppose that N equals 3, in a channel width exempting from licensed band, suppose that LTE establishesStandby CCA detect operation can distinguish from the energy of the LTE of same operator system, fromThe energy of the LTE system of other operator and other energy, be designated as respectively E_intra、E_interAnd E_others。Here, from the energy of the LTE system of same operator can refer in this bandwidth from sameThe gross energy of the signal of the LTE system of individual operator; Or, can be those can identify fromThe gross energy of the signal of the LTE system of an operator. From the energy of the LTE system of other operatorAmount can refer to the gross energy of the signal of the LTE system from other operator in this bandwidth; OrPerson can be the gross energy of the signal of those the LTE systems from other operator that can identify. ItsIts energy can refer to the gross energy from other wireless system in this bandwidth; Or, can comeFrom the energy of other wireless system and some the LTE systems from same operator that can not identifyEnergy; Or, can be can not identify from the energy of other wireless system and some from other fortuneThe energy of the business's of battalion LTE system; Or, can be can not with some from the energy of other wireless systemThe energy of the LTE system of identification.

Energy to the LTE system from same operator, from the LTE system of other operatorEnergy and other energy adopt respectively different detection threshold, be set in advance as respectively Th_intra、Th_interAnd Th_others. As CCA detected value E_othersLower than thresholding Th_othersTime, can think not exist and itThe restriction that coexists of its wireless system; As CCA detected value E_interLower than thresholding Th_interTime, can thinkLTE equipment does not exist other sending other operator of data in closer scope aroundLTE equipment; As CCA detected value E_intraLower than thresholding Th_intraTime, can think that a LTE establishesFor not existing other LTE of sending the same operator of data to establish in closer scope aroundStandby.

In general, thresholding Th_othersThan thresholding Th_intraAnd Th_interStricter. , from otherAs long as signal strength signal intensity reaches a lower value, LTE equipment just should be avoided busy channel, thereby anti-The only interference of the signal to other wireless system. Thresholding Th_interThan thresholding Th_intraStricter, this be because ofFor the LTE system of different operators generally can not be coordinated, that is, and from the LTE of other operatorAs long as the signal strength signal intensity of system reaches a lower value, LTE equipment just should be avoided busy channel,Thereby prevent the interference of the signal of the LTE system to other operator. And to from same operatorLTE signal, because coordinate than being easier to, only has when other LTE letter from same operatorNumber more intense time, LTE equipment just should busy channel.

Work as E_othersBe less than Th_others，E_interBe less than Th_inter, and E_intraBe less than Th_intraTime, LTEEquipment can carry out transfer of data by busy channel;

Otherwise LTE equipment can not busy channel. At this moment, if E_intraBe more than or equal to Th_intra, be to keep awayExempt from the interference to other LTE system from same operator; If E_interBe more than or equal to Th_inter，It is the interference of having avoided the LTE system from other operator; If E_othersBe more than or equal to Th_others，It is the interference of having avoided the signal to other wireless system.

Embodiment tri-

Exempting from licensed band, for the coexisting of other LTE system and other wireless system, LTE establishesStandby before transmitted signal, need to detect channel status, and only have and in the time of channel idle, just can take letterRoad. In the time that LTE equipment has data to send, LTE can detect channel on all time resourcesState, and once channel status be detected and meeting the condition of channel status (LBT), LTE establishesStandby just can busy channel. Or, as shown in Figure 4, time resource alternately can be divided into time period AWith time period B, and it is not busy and while meeting the condition of LBT only on time period A, to detect channel status,LTE equipment can busy channel. When LTE equipment detects in time period A can busy channelTime, can be the resource of a remainder of holding time section A and next time period B; Or, letterRoad holding time can comprise remainder and follow-up multiple continuous time period A and the B of time period AResource. Time period A and B can be period allocated, when an adjacent time period A and oneBetween a basic structure of section B composition, its total length of time can be a subframe, can be also multiple sonsFrame. Or the total length of time period A and B can be also variable, limited but total length remains, thereby can provide the chance of seizing channel to miscellaneous equipment.

LTE equipment is exempting from licensed band, to detect channel status, and in the time channel busy being detected, LBTCounter is set to a random value. LTE equipment continues to detect channel, and in satisfying conditionLBT counter is successively decreased. For example, LTE equipment detects within a unit interval (TU)Channel idle, can subtract one to LBT counter. For example, according to Europe to exempting from the regulation of licensed band,TU is at least 20us, and equipment is carried out CCA and detected channel in a TU, if find channel idle,Directly busy channel of equipment; If discovery channel busy, equipment need to start expansion CCA(ECCA) process, that is, produce at random a number N and CCA be set and detect T counter, at every turn thisIndividual device discovery channel keeps the free time can subtract one to above-mentioned counter in a TU, if thisDevice discovery channel busy, counter remains unchanged, and in the time that counter makes zero, this equipment canBusy channel.

On time period A, LTE equipment can detect channel status, and when meeting the bar of LBTWhen part, start LTE transmission; If can not meet the condition of LTE on time period A, LTE equipmentResource that can not holding time section B. For example, time period A can be first three OFDM of corresponding subframeSymbol. LTE equipment can be only in first three OFDM symbol of subframe, to detect that channel idle alsoWhen meeting LBT condition, could start LTE transmission; If can not in first three OFDM symbolMeet LBT condition, LTE equipment can not be in the enterprising line number of OFDM symbol below of subframe reportedlyDefeated. The benefit of first three OFDM symbol of the corresponding subframe of above-mentioned setup times section A is, when base station existsDetect channel in time period A and meet after LBT condition, can reuse existing PDSCH structure in subframeOn OFDM symbol below, carry out transfer of data. Suppose that the time point that meets LBT condition is positioned at nIndividual OFDM symbol, base station can indicate the PDSCH of UE to transmit from n+1 OFDM symbolStart, n equals 1,2 or 3. Suppose that uplink also adopts LBT method above, follows according to shortThe physical mappings method of the PUSCH of the subframe of ring prefix (CP), demodulated reference signal (DMRS)Be to be mapped to the 4th single-carrier frequency division multiple access (SCFDMA) symbol, adopt said method and make the timeSection A comprises 3 SCFDMA symbols, thereby the transmission that can not affect DMRS ensures PUSCHDemodulation performance.

The method of two kinds of processing time section B is described below.

The first processing method is that LTE equipment detects channel status on time period A, but discontentedThe condition of foot LBT, LTE equipment can not carry out LTE transmission in time period B; And, timeBetween section B in, LTE equipment directly suspend (hang-ups) LBT operate, no longer detect channel status.

The second processing method is that LTE equipment detects channel status on time period A, but discontentedThe condition of foot LBT, so can not carry out LTE transmission in time period B; But, at time period BIn, LTE equipment continues to detect channel status, and finds that each channel keeps empty in a TUIdle, subtracts one to LBT counter, until LBT counter makes zero, stops LBT operation. Here,In time period B, although LBT counter has made zero, can not carry out LTE transfer of data.

Here, a problem is that the LBT counter of LTE equipment can in a new time period AThe processing method of LBT can also not make zero, so need to be discussed.

First method is to each time period A, always restarts LBT operation. For example,, to EuropeContinent is the LBT method based on CCA/ECCA to the regulation of exempting from licensed band, always loses previousECCA counting operation, re-executes CCA/ECCA operation.

Second method is to a time period A, selects processing side according to LBT counter current stateMethod. Here, depend on the method for processing time section B, what current LBT count status can reflect isThe upper state of LBT counter when one time period, A finished; Or current LBT count status also canWith reflection is the result after time period B continues to upgrade LBT count status. An if front LBTOperation completes, and LBT counter makes zero, and restarts LBT operation. For example,, according to upperState Europe to exempting from the regulation of licensed band, when ECCA counter makes zero, re-execute CCA/ECCA behaviourDo, carry out processing channel and take. That is, equipment is carried out CCA and is detected channel in a TU, if foundChannel idle, directly busy channel of equipment; If discovery channel busy, device start ECCAProcess. If a front LBT has operated, LBT counter does not make zero, before continuing to carry outLBT process once. For example,, to the method based on CCA/ECCA, when ECCA counter is not returned, continue to carry out the ECCA counting operation not making zero in previous time period A at 1 o'clock. , new at thisTime period A in, this device discovery channel keeps the free time can be to above-mentioned in a TU at every turnCounter subtracts one, if this equipment is found channel busy in a TU, counter remains unchanged,In the time that counter makes zero, this equipment can busy channel.

Embodiment tetra-

The same with embodiment tri-, according to structure as shown in Figure 4, exempting from channel of licensed bandTime resource is alternately divided into time period A and time period B. Suppose when channel sky detected on time period AIdle, LTE equipment can busy channel. When LTE equipment detects passable in time period AWhen busy channel, it can be the resource of a remainder of holding time section A and next time period B;Or Channel holding time can comprise remainder and the follow-up multiple continuous time period of time period AThe resource of A and B. By configure multiple OFDM symbols in time period A, provide repeatedly and seizedThe chance of channel. When the channel status of the multiple OFDM symbols in time period A is all busy, LTEEquipment can not busy channel. Different from embodiment tri-, the present embodiment four hypothesis do not open when channel busy detectedMoving LBT counting operation. Time period A and B can be period allocated, an adjacent time period AWith a basic frame structure of a time period B composition, its total length of time can be a subframe, also canTo be multiple subframes. Or the total length of time period A and B can be also variable, but total lengthRemain limited, thereby can provide the chance of seizing channel to miscellaneous equipment.

In time period A, can comprise multiple OFDM symbols, for example, the corresponding subframe of time period AFirst three interior OFDM symbol. First three OFDM symbol in the corresponding subframe of above-mentioned setup times section ANumber benefit be, when channel idle is detected in base station in time period A, can be at the OFDM below of subframeOn symbol, carry out PDSCH transmission. Suppose that the time point that meets LBT condition is positioned at n OFDM symbolNumber, base station can indicate the PDSCH of UE to transmit from n+1 OFDM sign-on. SupposeUplink also adopts LBT method above, according to the physical mappings of the PUSCH of the subframe of short CPMethod, DMRS is mapped to the 4th SCFDMA symbol, so this method can not affect DMRSThereby transmission ensure the demodulation performance to PUSCH.

As shown in Figure 5, two kinds of methods that detect channel status are described below.

First method be LTE equipment in time period A in order successively on each OFDM symbolCarry out Channel Detection, and when channel idle detected on n OFDM symbol time, stop channelDetect operation, and from n+1 OFDM sign-on busy channel. Adopt this method, the time periodFirst OFDM symbol of A place subframe necessarily can not be used for LTE transmission.

Second method is on first method basis, is increased in the previous subframe of time period AChannel Detection on a rear OFDM symbol, LTE equipment is in order successively before time period AOn last OFDM symbol of a subframe and each OFDM symbol of time period A, carry out channelDetect, and when channel idle detected on an OFDM symbol time, stop Channel Detection operation,And from next OFDM sign-on busy channel. Adopt this method, if time period A'sChannel idle on last OFDM symbol of previous subframe, time period A place subframeAll OFDM symbols may be used to LTE transmission.

Adopt method above, to the basic frame of each time period A and time period B formation, by joiningPut time period A and comprise multiple OFDM symbols, increased the chance of LTE Equipment Inspection channel status,Thereby improve the probability of success in the time of competitive resource.

Embodiment five

Exempting from licensed band, for the coexisting of other LTE system and other wireless system, LTE establishesFor need to detect channel status (LBT) before transmitted signal, and safeguard LBT counter. In general,If LTE Equipment Inspection is to channel busy, LBT counter is set to a random value. LTEEquipment continues to detect channel, and in satisfying condition, LBT counter is successively decreased. For example, LTEEquipment detects channel idle within a unit interval (TU), can subtract one to LBT counter.For example, according to Europe, to exempting from the regulation of licensed band, TU is at least 20us; And to WiFi system, beIn every 9us, judge a channel status and it is retreated to (backoff) counter and operate.

LTE Equipment Inspection may not be to be positioned at subframe limit to channel idle moment of meeting LBT conditionThe border of front 3 OFDM symbols of boundary or subframe, at this moment, existing LTE is not supported in when above-mentionedGet started transmission data quarter. For busy channel, LTE equipment can during this period of time send and compriseThe targeting signal of known array, until LTE equipment can send data. From meet LBT condition timeThe time span that is carved into the moment that can send PDSCH is random, so targeting signal needs canEffectively support elongated structure. The present invention proposes targeting signal and can be made up of basic sequence. Described basicTime span corresponding to sequence equals the length of an OFDM symbol. Or, because TU is generally ratioThe less time period, LTE Equipment Inspection channel idle the moment that meets LBT condition may not beThe border of OFDM symbol. In order to transmit as much as possible complete targeting signal basic sequence, basic sequenceTime span can be shorter, for example, the length of described basic sequence equals CCA section observing timeLength, equal the length of TU. Especially, when the length of TU equals OFDM symbol and CPWhen the 1/N of length, i.e. in the time period of each OFDM symbol and CP, comprise N complete basicSequence time section, N is integer, the time period of OFDM symbol and CP thereof is divided into NCCA section observing time, thus a part meets the just in time corresponding OFDM of moment of Channel holding timeThe border of symbol.

Targeting signal can comprise the repeatedly repetition to same basic sequence. Here, if targeting signalLength is not the integral multiple of basic sequence length, and targeting signal can comprise the repeatedly complete of basic sequenceRepeat and once not exclusively repeat. To the structure of this repetition, can be to each basic sequence respectivelyAdd CP. Or the multiple basic sequences that form targeting signal can be different. At this moment, each basicSequence need to be added respectively CP. Especially, when the time span of basic sequence equals an OFDM symbolNumber length, CP length also with the CP length of the corresponding OFDM symbol in the subframe of LTE systemEquate. The sub-carrier positions of each basic sequence mapping of above-mentioned targeting signal can be different, therebyLTE equipment can be measured by targeting signal the information of more subcarrier. Especially, can be by handleThereby a frequency domain basic sequence is mapped to different sub-carrier positions and obtains the basic order of multiple different time domainsRow.

According to analysis above, be random the zero hour of targeting signal, and may be not at OFDMCharacter boundary or subframe border. In order to make LTE equipment in the time detecting targeting signal, can know for sureTargeting signal timing, the time domain mapping of targeting signal can be the reference time point fixing with respect to.Reference time point can be subframe border. Or reference time point can be n OFDM of subframeThe end position of symbol, for example n equals 3. For example, can be ensure LTE equipment send leadingSignal must be the border of corresponding basic sequence on reference time point. Especially, suppose targeting signal byOne or more OFDM symbol composition, is mapped in LTE subframe according to targeting signal delivery timePosition, the start-stop timing of the OFDM symbol of targeting signal and OFDM symbol pair corresponding in subframeTogether. Adopt this method, targeting signal can be for obtaining subframe timing. To adopting multiple different basesThis sequence forms the method for targeting signal, need to define targeting signal inside with respect to above-mentioned reference time pointThe order of each basic sequence. The schematic diagram of a targeting signal time domain mapping as shown in Figure 6. ThisIn suppose that LTE data can only start from the starting position of subframe transmission, taking subframe border as targeting signalReference time point, no matter the starting point of targeting signal is in that moment, all ensures that targeting signal is on subframe limitBoundary finishes. Upper figure is the schematic diagram of long preamble, and figure below is according to the moment that channel idle detectedThe schematic diagram of the actual targeting signal sending, its starting position has only comprised part basic sequence, is equivalent toBe CP, and basic sequence finish on subframe border. In fact, figure below is the equal of leading at upper figureOn the basis of signal, cut out the former part of time point that detection channel meets LBT condition.

The schematic diagram of another targeting signal time domain mapping as shown in Figure 7. Here suppose that LTE dataCan, from the 4th of a subframe OFDM sign-on transmission, can be with the 3rd OFDM of subframe lateThe end position of symbol is as a reference point, no matter the starting point of targeting signal is in that moment, before all ensureingLeading signal finishes at the end position of the 3rd OFDM symbol of subframe. Upper figure is showing of long preambleIntention. Middle figure is the schematic diagram that basis detects the targeting signal of the actual transmission of moment of channel idle,Its starting position has only comprised part basic sequence, is the equal of CP, and hypothesis is from second of subframe hereIndividual OFDM sign-on sends data, so in second of subframe and the 3rd OFDM symbolReality does not send targeting signal. Figure below is the leading letter that basis detects the actual transmission of moment of channel idleNumber another schematic diagram, the beginning of targeting signal has only comprised part basic sequence, is the equal of CP,Here suppose that the moment of channel idle is positioned at second OFDM symbol of subframe, and from the 4th of subframeIndividual OFDM sign-on sends data. In fact, middle figure and figure below are all at the targeting signal of upper figureOn basis, cut out the former part of time point that detection channel meets LBT condition.

The frequency domain mapping method of targeting signal is described below.

Targeting signal basic sequence can be the subcarrier that takies all LTE, correspondingly the length of basic sequenceDegree is the length of an OFDM symbol.

Or, the subcarrier in whole LTE bandwidth can be divided into N comb (Comb), kIndividual comb takies k subcarrier of every N subcarrier, and N is integer, and k equals 0,1 ... N-1. OneLTE equipment only sends described targeting signal on a comb therein; And to other comb, this LTEEquipment does not send any signal. Adopt in this way and the length of basic sequence can be reduced to oneThe 1/N of the length of OFDM symbol. As shown in Figure 8, be that LTE bandwidth is divided into showing of two combsIntention. For strict guarantee targeting signal takies in every two subcarriers. Consider that LTE is descendingNeed to insert DC, can be using DC as a subcarrier in the situation that, and above-mentioned k comb reflectsBe mapped to k subcarrier of every N subcarrier, for example, targeting signal can be mapped to sub-carrier indices2k and-2k-1, k equals 0,1 ... M/2-1, wherein M is the number of available subcarrier in system bandwidth.Adopt this method, multiple LTE equipment can send targeting signal on different combs, and at anotherOn the comb that individual all LTE equipment does not use, can measure from other beyond LTE system wirelessThe signal of system.

Or, also can in whole LTE bandwidth, distribute many group subbands, above-mentioned each group subband is to disperseOn system bandwidth, each subband comprises continuous multiple subcarriers, for example, comprise one or more and connectThe sub-carrier resources of continuous PRB. A LTE equipment only sends targeting signal on one group of subband therein.As shown in Figure 9, the centre frequency of considering WiFi signal can be the frequency of arbitrary interval 5MHz,The core of the each 5MHz subband in LTE system bandwidth, for example about 6 PRB, Ke NengxuTargeting signal is used for measuring the signal from other wireless system, so can be mapped to other frequency moneyOn source. Adopt this method, multiple LTE equipment can not send targeting signal on subband on the same group,And on the one group of subband not using at another all LTE equipment, can measure from LTE system withThe signal of other outer wireless systems.

The sequence of above-mentioned targeting signal can be different to each LTE community, for example, and with LTEPhysical Cell Identifier (PCID) correspondence of community; Or, the sequence of above-mentioned targeting signal can be forDistinguish LTE operator, that is, different LTE operators can configure different targeting signals; Or,The sequence of above-mentioned targeting signal is all consistent to all LTE systems, thereby only can represent from LTEThe signal of system.

Targeting signal can define according to LTE system bandwidth, the bandwidth position that centre frequency is differentBe set up and reuse identical targeting signal sequence. As shown in figure 10, for convenience of description, use numeral 1,2,3 and 4 identify the sequence of the different frequency position of targeting signal. The system bandwidth of supposing multiple communities canTo be partly overlapping, for example, these communities can be to be under the jurisdiction of respectively different operators. Suppose oneIndividual LTE equipment still need to detect based on targeting signal the leading letter of the overlapping community of these portions of bandwidthNumber,, on a 5MHz subband, LTE equipment need to detect 4 different sequence fragments and could examineSurvey targeting signal.

The expense detecting in order to reduce targeting signal, can arrange an overall targeting signal sequence, to oneIndividual CF position, the sequence fragment that ensures the described targeting signal of its mapping is the leading letter of the described overall situationA fixing part in number sequence, and do not rely on the position of bandwidth center frequency. For example, canBe the starting point of exempting from licensed band with respect to one, a long sequence is set, each fragment of this long sequenceA specific frequency in licensed band is corresponding with exempting from, according to the centre frequency of LTE community, from thisIn long sequence, intercept corresponding part as targeting signal sequence. As shown in figure 11, by adopting before the overall situationLead burst, on a 5MHz subband, the sequence form of possible targeting signal is all consistent,Thereby be conducive to reduce detection overhead.

Suppose that targeting signal can be made up of the complete OFDM symbol of one or more LTE system.The basic sequence of an OFDM symbols carry of targeting signal can take this OFDM symbolAll subcarriers, or, can be also a part of subcarrier that only takies this OFDM symbol. For example,Above-mentioned basic sequence is mapped to 1 in every 6 subcarriers. To shining upon the subcarrier of above-mentioned basic sequenceOther subcarriers in addition, can be not send any signal, or can on these subcarriers, sendOther information, for example, base station can send Downlink Control Information or downlink data on these subcarriers.The basic sequence that each OFDM symbol of leading channel sends can be identical, or different. BeforeLeading the basic sequence sending in an OFDM symbol of signal can be single sequence, or, also canTaking Further Division in fact as multiple subsequences, and make each subsequence can be for completing different meritsEnergy. For example, in same OFDM symbol, transmission two-stage is for obtaining synchronous signal, suitablePSS and SSS in existing LTE system.

Alternatively, to front p OFDM symbol of targeting signal, only can be at every N subcarrierIn take 1 subcarrier and send basic sequence A, and other N-1 subcarrier do not send any signal,N is integer. From time domain, it is equivalent to the time of an OFDM symbol to be divided into N part,The signal of various piece is identical, or differs certain phase place. And follow-up OFDM to targeting signalSymbol, can be in different frequencies multiplexing basic sequence and other information, for example, base station can be at thisOn a little carrier wave, send control information or downlink data. Following front p OFDM symbol of targeting signalPart in number is called A part, and follow-up beyond front p OFDM symbol of targeting signalOFDM symbol is called B part. The basic sequence A sending in an OFDM symbol can be singleOne sequence, or also in fact Further Division is multiple subsequences. Send base because be allThis sequence A, the signal of p OFDM symbol of A part is identical. To B part, its carryingBasic sequence and/or subcarrier mapping structure can be different from part A. Further, if B part bagContaining multiple OFDM symbols, the basic sequence of each OFDM symbols carry and/or subcarrier mapping knotStructure can be identical or different. A part can realize channel occupancy, can also be used for simultaneously AGC,Synchronously, identifying cells, mark operator or other functions; B part also can for AGC, synchronous,Identifying cells, mark operator or other functions. Here, p gets fixed value, such as p etc.In 1. Or, the value of p can depend on meet channel occupancy condition time be engraved in OFDM symbolPosition. For example, if meet channel occupancy condition time be engraved in OFDM symbol earlier,Still the information that can transmit basic sequence A in the remaining time of first OFDM symbol, p canLess with value, for example p equals 1; Otherwise, if meet channel occupancy condition time be engraved in OFDMAfter relatively leaning in symbol, i.e. in the remaining time of first OFDM symbol, be not enough to transmit basic sequence AInformation, p value can add 1, for example p equals 2, thereby at second OFDM of targeting signalOn symbol also only for having sent basic sequence A. Or the value of p depends on and meets channel occupancy barPart time be engraved in the position in OFDM symbol another example be: if meet channel occupancy condition timeFirst OFDM symbol inside that is engraved in targeting signal, p equals 1, but can not ensure receiving terminal oneSurely can receive basic sequence A; Otherwise, if meet channel occupancy condition time be engraved in an OFDMThe border of symbol, p equals 0, in targeting signal, does not send basic sequence A.

If Figure 19 is the schematic diagram of targeting signal mapping. Here suppose that targeting signal comprises 3 OFDMSymbol. Corresponding OFDM character boundary according to the timing of structure targeting signal above with present frame structureAlign. That is, LTE equipment meets after the condition of channel occupancy at n OFDM symbol of subframe,The stop timing of k OFDM symbol of the targeting signal of its transmission and n+p OFDM of subframeThe stop timing alignment of symbol. K equals 0,1 ... K-1. K is the OFDM symbol numbers of targeting signal.Here,, at n OFDM symbol of subframe, the moment that meets channel occupancy condition may not beThe original position of n OFDM symbol. At this moment, determine in the end of the OFDM symbol that ensures targeting signalTime situation about remaining unchanged under, cut out targeting signal first OFDM symbol meet channel occupancy timeBetween before part. For example, in Figure 19, the last portion of first OFDM symbol of targeting signalDivide and cut out.

Adopt targeting signal structure as shown in figure 19, to its first OFDM symbol, although before itPortion likely can be cut out, if meet channel occupancy condition time be engraved in OFDM symbol and relatively lean onBefore, but receiving terminal is still likely received the basic sequence A information that it carries. According to describing above,Basic sequence A in first OFDM symbol of targeting signal only takies one in every N subcarrierIndividual, correspondingly, its spatial structure is to be equivalent to the time of an OFDM symbol to be divided into N sonPiece, the sequence of each sub-block is identical, or differs certain phase place. Like this, as long as receiving terminal canTo receive at least one sub-block, just likely obtain the information that targeting signal carries. When meeting channel occupancyThe moment of condition has approached OFDM sign-off position, for example, and first OFDM symbol surplusRemaining part is divided may be not enough to transmit a sub-block, and at this moment receiving terminal can not obtain first OFDM symbolBasic sequence A information. A possible processing method is second OFDM symbol at targeting signalSend the signal identical with first OFDM symbol. Guarantee has an OFDM symbol at least like thisIn time span, transmit the information of basic sequence A.

Alternatively, suppose that targeting signal just starts transmission from the initial timing of the CP of OFDM symbol,Can send from first OFDM sign-on of targeting signal; Or, can be also before thinking and leaving forBe 0 the remaining time of leading first OFDM symbol of signal, thereby LTE equipment is actually from leadingSecond OFDM sign-on of signal sends targeting signal.

A kind of method for designing of time-frequency structure of targeting signal is described below. Because meet channel occupancy conditionTime to be engraved in a position in subframe be random, in general, seize first subframe after channelWithin only remaining rear portion is positioned at Channel holding time. For within the rear portion time of this subframeBetter supported data transmission, to the transmission mode based on CRS, need to send CRS as much as possibleSignal; To the transmission mode based on DMRS, need to send DMRS signal as much as possible, therebyImprove precision of channel estimation. So the targeting signal structure that the present invention proposes is below avoided and CRS as far as possibleWith the conflict of DMRS, thus optimizing data performance.

Taking general CP length as example, as shown in figure 20, CRS and DMRS in a subframeMapping position schematic diagram. Wherein, to configuring the situation of 1 or 2 CRS port, OFDM symbol0,4,7 and 11 transmit for CRS; To configuring the situation of 4 CRS ports, OFDM symbol 0,1,4,7,8 and 11 transmit for CRS; DMRS is mapped to OFDM symbol 5,6,12 and13. The time-frequency structure of targeting signal need to be avoided the conflict of above-mentioned CRS and/or DMRS.

The present invention proposes the method for design targeting signal below. The A part of targeting signal is only for passingDefeated basic sequence A, the function of the OFDM symbol of the LTE subframe corresponding with it is irrelevant, i.e. leading letterNumber the OFDM symbol of A part do not send other signals. The OFDM symbolic number of note transmission A partFor p because meet channel occupancy condition time to be engraved in a position in subframe be random, leading letterNumber normally, since a position in an OFDM symbol, this causes in a front p OFDMThe time that reality has sent targeting signal is less than the duration of p OFDM symbol, but is greater than p-1The duration of OFDM symbol.

To the B part of targeting signal, can be independent of downlink data transmission, i.e. the OFDM of B partSymbol is not used in control information and the corresponding demodulation ginseng of transmitting downlink data and dispatching downlink transfer of dataExamine signal, the B of targeting signal part can not send CRS and DMRS.

Or, to the B part of targeting signal, also can be supported on such OFDM symbol and transmitDemodulated reference signal, comprises CRS and/or DMRS. For example, can design according to the methods below:

1) to B part, if the OFDM symbol in its corresponding LTE subframe need to shine upon CRS,In the sub-carrier positions that so follow-up OFDM symbol of targeting signal is inherent identical, send CRS.

Adopt this method, under the prerequisite of CRS mapping position that does not change LTE subframe, increasedIn the transmission density of the CRS of the starting position of channel occupancy, thereby optimize the operation based on CRS, exampleAs, synchronous tracking, data demodulates etc.

2), to B part, the information that is mapped to fixing sub-carrier positions of targeting signal can only be mapped toDo not comprise on the OFDM symbol of CRS.

Some information of transmitting in targeting signal, the sub-carrier positions of its mapping need to be fixed, therebyReceiving terminal, in the time receiving these information, does not need the sub-carrier positions that blind Detecting is different, reduction receiving terminalComplexity. For example, for synchronous reference is provided, in targeting signal, need to comprise the signal for synchronous,Be the thick synchronous reference signal that function class is similar to the PSS/SSS in LTE, the son of such signal map carriesRipple position is generally fixed. The information that is mapped to fixing sub-carrier positions is like this not suitable for comprisingIn the OFDM symbol of CRS, send. Because along with the variation of PCID, CRS likely needs to be mapped toOn any one subcarrier, this has caused under specific PCID, being mapped to of CRS and targeting signalThe information collision of fixing sub-carrier positions.

Suppose that p equals 1, only have first OFDM symbol of targeting signal just for transmitting basic orderRow A. Because meet channel occupancy condition time to be engraved in a position in subframe be random, as Figure 21Shown in, corresponding OFDM symbol can in LTE subframe for p+1 OFDM symbol of targeting signalBeing not comprise CRS, thereby can carrying and be mapped to fixing sub-carrier positions in this OFDM symbolInformation; Or as shown in figure 22, p+1 OFDM symbol of targeting signal is in LTE subframeThe OFDM symbol of middle correspondence can comprise CRS, thereby this OFDM symbol can not send mappingTo the information of fixing sub-carrier positions, that is, the information that is mapped to fixing sub-carrier positions can only be moreAdd in the OFDM symbol that does not comprise CRS after leaning on and send, for example p+2 OFDM symbol. RootAccording to description above because meet channel occupancy condition time be engraved in the difference of a position in subframe,Cause the OFDM in targeting signal that the information that need to be mapped to fixing sub-carrier positions is mapped toCharacter position changes. In Figure 21 and Figure 22, be to represent and need to be mapped to admittedly with synchronizing signalThe information of fixed sub-carrier positions.

Adopt this method, avoid the sequence of targeting signal and conflicting of CRS, thereby targeting signal stillCan send CRS signal according to the CRS structure of LTE, thereby increase the start bit at channel occupancyThe transmission density of the CRS putting, thus optimize the operation based on CRS, for example, synchronous tracking, dataDemodulation etc.

3) to B part, if the OFDM symbol in its corresponding LTE subframe need to shine upon DMRS,In the sub-carrier positions that so follow-up OFDM symbol of targeting signal is inherent identical, send DMRS.

Adopt this method, under the prerequisite of DMRS mapping position that does not change LTE subframe, increaseIn Channel holding time, send the probability of DMRS, thereby optimize the data demodulates based on DMRSDeng.

4), to B part, the information that is mapped to fixing sub-carrier positions of targeting signal can only be mapped toOn the RE that does not comprise DMRS of OFDM symbol.

For fear of with the conflicting of DMRS, the information that is mapped to fixing sub-carrier positions of targeting signalIn an OFDM symbol, can only use other subcarriers beyond the subcarrier that DMRS takies.As shown in figure 23, these subcarriers are to be divided into two at a PRB, every 3 continuous subcarriers.In these 6 subcarriers, have two pairs of subcarriers, its subcarrier spacing is 6, that is, and and mark ' 1 ' in Figure 23' 2 ' square frame two is to sub-carrier resources. In whole bandwidth, the resource that these two pairs of subcarriers are corresponding is fullFoot 1 of every 6 sub-carrier occupancy on full bandwidth, can be preferentially mapped to fixing son and carry for carryingThe information of ripple position.

According to description above, if do not need to consider the mapping of DMRS, can be only according to establishing aboveMeter 1) and 2) retrain targeting signal structure, do not comprising in the symbol of CRS, can be clevererThe sequence of the mapping targeting signal of living. Or, if need to consider the impact of DMRS, can only pressRetrain targeting signal structure according to 4 designs above, do not comprising in the symbol of CRS, further limitMake RE beyond DMRSRE only for carrying the sequence of targeting signal. To the B part of targeting signal,Can be not used in transmitting downlink data; Or, can further allow downlink data transmission. At this moment, canTo be the basic sequence of directly removing CRSRE, DMRSRE and targeting signal in rate-matchedThe RE that signal map arrives, especially, removes the RE of the information mapping that is mapped to fixing sub-carrier positions.

According to description above, meet channel occupancy condition time to be engraved in a position in subframe be random, that is, channel is likely seized from any one OFDM character position in base station. In order to reduce UE'sProcessing expenditure can be that restriction base station can only start to send descending from a few OFDM character positionData and/or its schedule information, correspondingly, UE can only suppose to detect base according to above-mentioned a fewThe signal of standing and downlink data receiving and/or its schedule information. Remember that i can start to send downlink dataAnd/or the OFDM character position of its schedule information is k_i, i=0,1 ..., M-1, M is that starting of supporting sends outSend the sum of the OFDM character position of downlink data and/or its schedule information. Without loss of generality, belowSuppose k₀＜k₁＜...＜k_M-1. At this moment, targeting signal need to be elongated, an OFDM symbol comprisingNumber is variable. If before starting to send the OFDM symbol of downlink data and/or its schedule informationBase station down signal definition be targeting signal, the length of targeting signal equals to seize from base station channelIn time, is carved into base station and starts to send the time difference between downlink data and/or its schedule information.

If Figure 24 is the schematic diagram of elongated targeting signal. Suppose that base station is from OFDM symbol k_xStart to send outSend downlink data and/or its schedule information, targeting signal is at OFDM symbol k_xFront border finish.The shortest time length of targeting signal is to ensure that it can be used as a kind of source signal, completes synchronously, identifies littleThe operations such as district. Corresponding to the maximum duration length of targeting signal, the time started of targeting signal can be positionIn OFDM symbol k_x-1Before, and targeting signal at OFDM symbol k_x-1Lasting deficiency of time beforeUsing as a kind of source signal, complete the operations such as synchronous, identifying cells. OFDM symbol k_x-1And k_xContinuousTwo OFDM notation indexs that start to send downlink data and/or its schedule information.

According to the structure of above-mentioned targeting signal, the OFDM total number of symbols of note targeting signal is L, its A portionDivide and only send basic sequence A, and its B part can send basic sequence and other information. Note A portionPoint and the OFDM number of symbols of B part be respectively p and q, the moment that depends on base station and seize channel,L changes, and correspondingly needs to arrange p and q. The stop timing of supposing targeting signal is positioned at OFDMSymbol k_xFront border, the A of targeting signal part is positioned at OFDM symbol k_xBefore the front border of-q,And the B of targeting signal part is positioned at OFDM symbol k_xThe front border of-q and OFDM symbol k_xFrontBetween boundary. In fact, because the timing between each LTE equipment is not ideal synchronisation, an equipmentIn the time detecting the targeting signal of another base station, can only be to enter near the desirable timing of above-mentioned targeting signalRow detects.

The structure of the first targeting signal is to adopt fixing q, seizes and make the value of p depend on base stationThe timing position of channel. To the B part of targeting signal, the value of its OFDM symbol numbers q is greater thanEqual a minimum of a value q_min, guarantee can be supported certain function, for example synchronous, cell ID, operationTrade mark knowledge etc. For example, q equals 1 or 2. Depend on actual targeting signal design, to A part,Can be to allow the time span of A part to equal 0, or the time span of A part must be greater than etc.In a minimum of a value p_min. Be the schematic diagram of this structure as shown in figure 25, suppose that q is fixed as 1 here,And the value of p can change between 1 to 4.

Concerning base station, it can be A part by detecting targeting signal detect other base stations orThe signal of other LTE operators and complete other functions. Here, base station can be in all possible timingThe signal of upper detection A part, for example, is positioned at OFDM symbol k_xBefore the front border of-q and before being positioned atLead the maximum length of signal with each interior timing; Or, can be also according to the minimum duration of A partp_minThe signal that detects A part, for example, is positioned at OFDM symbol k_xDuration before the front border of-qFor p_minScope in. Or base station can be also according to the B of the q of targeting signal OFDM symbolPart detects the signal of other base stations or other LTE operators and completes other functions; Or, enterOne step ground, base station can be also according to the minimum OFDM number of symbols q of the B part of targeting signal_minComeThe signal that detects B part, is positioned at OFDM symbol k_x-q_minFront border and OFDM symbol k_x'sPart between front border, detects the signal of other base stations or other LTE operators and completes otherFunction. Or other base stations or other LTE can be detected in conjunction with A part and B part in base stationThe signal of operator and complete other functions.

Concerning UE, because the length of A part changes, in order to reduce complexity, a kind of possibilityMethod be that UE does not need to detect A part, and just detect q OFDM of the B part of targeting signalSymbol, completes the functions such as synchronous, cell detection; Or further, UE can be also according to frontLead the minimum OFDM number of symbols q of the B part of signal_minThe signal that detects B part, is positioned atOFDM symbol k_x-q_minFront border and OFDM symbol k_xFront border between part, complete synchronous,The functions such as cell detection; Or UE can be also according to the minimum duration p of the A part of targeting signal_minThe signal that detects A part, is positioned at OFDM symbol k_xDuration before the front border of-q is p_minModelIn enclosing, and further combined with the detection of the B part of targeting signal, complete the functions such as synchronous, cell detection.

The structure of the second targeting signal is to adopt fixing p, seizes and make the value of q depend on base stationThe timing position of channel. To the B part of targeting signal, the value of q is more than or equal to a minimum of a value q_min，Guarantee can be supported certain function, for example synchronous, cell ID, operator's mark etc., for example q_minDengIn 1 or 2. Depending on actual targeting signal design, to A part, can be to allow A partDuration equals 0, or makes the duration of A part must be more than or equal to a minimum of a value p_min. As Figure 26 instituteShow it is the schematic diagram of this structure, suppose that p is fixed as 1 here, and allow A part duration to approach 0,And the value of q can change between 1 to 4, q_minEqual 1. Especially, be provided with A partMinimum duration p_minTime, suppose to reduce as far as possible A OFDM symbolic number partly, can be to allowP gets one of two continuous value p1 and p2, p2=p1+1. Seize the timing position place of channel from base stationOFDM sign-on calculate, suppose can send continuously A in OFDM symbol partly at p1Time is more than or equal to p_min, can A duration partly be p1, otherwise the duration of A part be p2.

Concerning base station, it can be A part by detecting targeting signal detect other base stations orThe signal of other LTE operators and complete other functions. Here, the end position of note targeting signal isOFDM symbol k_xFront border,, although the OFDM number of symbols p of A part fix,But in the moment that depends on base station and seize channel, A part remains and may appear at OFDM symbolk_x-q_minFront border before and the maximum length that is positioned at targeting signal with each timing on. Correspondingly,Base station have to the signal of blind Detecting A part in timing likely. Or base station can be also baseDetect other base stations or other LTE fortune in the possible OFDM symbol of the B of targeting signal partSeek business's signal and complete other functions. Further, base station can be also the B portion according to targeting signalThe minimum OFDM symbolic number q dividing_minThe signal that detects B part, is positioned at OFDM symbol k_x-q_minFront border and OFDM symbol k_xFront border between part, detect other base stations or otherThe signal of LTE operator and complete other functions. Or base station can be come in conjunction with A part and B partDetect the signal of other base stations or other LTE operators and complete other functions.

Concerning UE, because the timing position that A part occurs changes, in order to reduce complexity,UE does not detect A part, and only detects the possible OFDM symbol of the B part of targeting signal,Complete the functions such as synchronous, cell detection. Further, UE can be also the B portion according to targeting signalThe minimum length q dividing_minThe signal that detects B part, is positioned at OFDM symbol k_x-q_minFront borderWith OFDM symbol k_xFront border between part, complete the functions such as synchronous, cell detection. To above-mentionedThe structure of the first targeting signal, to B part, if do not send the signal such as CRS, DMRS, canTo shine upon the basic sequence of targeting signal on q the OFDM symbol in B part. Adopt in this way,The mapping structure of B part can start to send with base station the OFDM of downlink data and/or its schedule informationCharacter position is irrelevant.

To the structure of above-mentioned the second targeting signal, to B part, if do not send CRS, DMRS etc.Signal can shine upon the basic sequence of targeting signal on q OFDM symbol of B part. ThisIn, can be the structure that defines B part mapping basic sequence according to the maximum of q, and according to q'sActual value intercepts rear q OFDM symbol of the mapping structure of the B part definite according to the maximum of q,Thereby the mapping structure of B part can start to send downlink data and/or its schedule information with base stationOFDM character position is irrelevant. Especially, at B rear q partly_minIndividual OFDM symbol, mapping is basicThe structure of sequence is also fixed, and starts to send the OFDM of downlink data and/or its schedule information with base stationCharacter position is irrelevant.

To the structure of above-mentioned two kinds of targeting signals, if still send CRS in the B part of targeting signalAnd/or DMRS, only have the OFDM symbol that does not comprise CRS of B part can carry targeting signalNeeds be mapped to the information of fixing sub-carrier positions, and may further need to avoid and DMRSConflict. Adopt in this way, the mapping structure of B part depend on base station start to send downlink data and/Or the OFDM character position of its schedule information. To this situation, select base station to start to send downlink dataAnd/or the OFDM symbol k of its schedule information_x, can make at least a portion of B part not comprise CRSThe position of OFDM symbol fix. For example, select k_xMake OFDM symbol k_x-1 does not comprise CRS,Last OFDM symbol of B part comprises CRS scarcely; Or, select k_xMake OFDMSymbol k_x-1 and k_x-2 do not comprise CRS, and latter two OFDM symbol of B part comprises scarcelyCRS. Do not comprise on the OFDM symbol of fixed position of CRS at these, its mapping targeting signalThe structure of basic sequence can start to send with base station the OFDM symbol of downlink data and/or its schedule informationNumber location-independent.

Embodiment six

Exempting from licensed band, for the coexisting of other LTE system and other wireless system, LTE establishesFor need to detect channel status (LBT) before transmitted signal. Suppose that LTE equipment is a unit interval(TU) channel status in, detected, i.e. CCA. If channel idle, LTE equipment can take letterRoad; If channel busy, LTE equipment can not busy channel. At a channel strip of exempting from licensed bandWide upper, may there is the signal of LTE system and the signal of other wireless system. So, carry outWhen CCA detects, can distinguish dissimilar signal and carry out respectively CCA detection. For example, distinguish LTEThe signal of system and the signal of other wireless system; Or, distinguish the LTE letter from same operatorNumber, from the LTE signal of different operators with from the signal of other wireless systems.

Suppose to detect the signal of above-mentioned two kinds of systems in identical time resource and frequency resource.

Suppose that LTE equipment needs to send the targeting signal that comprises known array, LTE before transmission dataThereby can detecting the energy of this targeting signal, equipment judges whether to exist the signal of LTE system. Above-mentionedTargeting signal can be different to each LTE community, for example, above-mentioned targeting signal can with LTEPhysical Cell Identifier (PCID) correspondence of community; Or above-mentioned targeting signal can be for distinguishingThe mark of LTE operator, that is, different LTE operators can configure different targeting signals; Or,Above-mentioned targeting signal is all consistent to all LTE systems, thereby only can represent from LTE systemSignal.

In the resource of LTE Equipment Inspection channel status, before may having some LTE equipment sendingLead signal, the energy of this part LTE signal is to obtain by the detection of targeting signal; But,May also exist other LTE equipment current at transmission LTE data, this part LTE signalEnergy can not obtain by the detection of targeting signal.

Suppose that the LTE system of exempting from licensed band adopts unique targeting signal sequence, LTE equipment is logicalCross and detect after the energy that targeting signal obtains LTE signal, deduct above-mentioned by the total signal energy detectingThe energy of LTE signal, thus can be using approximate this difference as the energy from other wireless system and itsThe energy of the LTE system that it can not be identified. Or, adopt the method for interference delete, detect leadingAfter the energy of signal, recover this targeting signal with targeting signal sequence and the energy that detects, always receiveSignal deducts the targeting signal of this recovery, the approximate signal that comprises other wireless system of residual signal and itsThe signal of the LTE system that it can not be identified and, thereby can measure from it according to residual signalThe energy of the energy of its wireless system and other the LTE system that can not identify. Unique targeting sequencing hereCan refer to and not distinguish operator, all LTE systems of exempting from licensed band adopt identical targeting signalSequence; Or, also can refer to that the LTE system of exempting from licensed band of same operator adopts identicalTargeting signal sequence, and the equipment of this operator only attempts detecting the LTE signal from this operatorEnergy.

Suppose that the LTE system of exempting from licensed band can adopt multiple targeting signal sequences, correspondingly LTEEquipment need to detect the energy of multiple targeting signal sequences, and deducts above-mentioned by the total signal energy detectingDetected energy corresponding to multiple targeting signal sequences, thus be just approximately equal to the energy from other wireless systemThe energy of amount and other the LTE system that can not identify. Or the method for employing interference delete, is detectingTo after the energy of multiple targeting signals, with targeting signal sequence and the energy recovery that detects above-mentioned multiple beforeLead signal, always receive signal and deduct the targeting signal of these recoveries, residual signal is approximate comprises that other is wirelessThe signal of the signal of system and other the LTE system that can not identify and, thereby can be according to residual signalMeasure from the energy of other wireless system and the energy of other the LTE system that can not identify. Above-mentionedMultiple targeting signal sequences can refer to that the LTE system of same operator adopts multiple targeting signal ordersRow; Or, can be also that only multiple operators have configured respectively different targeting signal sequences, and oneIndividual LTE equipment attempts detecting the LTE signal of multiple operators.

Depend on the design of targeting signal, on an OFDM symbol of targeting signal, may only have oneParton carrier wave has sent known array, and other subcarriers may send other signal. So,Energy based on targeting signal Sequence Detection to LTE, may need further weighting. For example,, before supposingLead the known array of signal, only take the subcarrier of OFDM symbol half, and suppose other signalsThe EPRE of EPRE and known array is identical, can use based on targeting signal Sequence Detection and arrive LTE'sEnergy increases 3dB and estimates as the energy of total LTE.

Suppose to exist such time period, it can only and send targeting signal for detection of channel status, andCan not send LTE data. For example, the time division section A to Fig. 4 and the method for B, time period ACan be only for Channel Detection with send targeting signal, and do not send LTE data. Ensureing each communityOn synchronous basis, LTE equipment can obtain LTE by the detection of targeting signal on time period AThe energy of system, thus the energy that the gross energy detecting deducts above-mentioned LTE signal with regard to myopia equal fromThe energy of other wireless system. Or, the method for employing interference delete, LTE equipment is on time period ACan obtain after the energy of LTE system by the detection of targeting signal, by targeting signal sequence and detectingEnergy recover this targeting signal, always receive signal and deduct the targeting signal of this recovery, residual signalThe signal of the approximate signal that comprises other wireless system and other the LTE system that can not identify and, therebyCan measure energy and other LTE that can not identify from other wireless system according to residual signalThe energy of system.

Suppose it is the time resource identical, but detect from LTE system and its in different frequency resourceThe signal of its wireless system. Here,, by the method for frequency division, LTE equipment can be in different frequency moneyOn source, detect the energy of different system. Thereby to the detection of LTE system, also must depend on frontLead the detection of signal.

In the resource of measuring for channel status, the subcarrier in whole LTE bandwidth can be divided into NIndividual comb (Comb), N is integer, a LTE equipment can be only on a comb, to send out thereinSend LTE signal, thereby can on different combs, measure Different L TE system or other is without linear systemThe signal energy of system. For example, on a comb, transmitted signals not of all LTE equipment, so thisEnergy on individual comb has been indicated the characteristics of signals from other wireless signals; On other combs, eachLTE equipment is only transmitted signal on a comb, and for example, Different L TE operator is used different combsResource sends LTE signal, thereby on different combs, can detect different LTE systems.

As shown in figure 12, the subcarrier in whole LTE bandwidth can be divided into two combs (Comb),One of them comb still transmits for LTE, thereby has comprised the energy from LTE. And to anotherIndividual comb, LTE system does not send any signal, thereby can direct-detection on this comb out fromThe signal energy of other system. The multiplexing side of the method for above-mentioned two combs and LTE up direction SRSMethod is consistent. For example, suppose at up direction it is last symbol of the previous subframe based on subframe nCarry out SRS detection, can come by do not configure SRS transmission on a comb of SRS symbolObtain the resource for measuring other wireless system signal.

As shown in figure 13, the subcarrier in whole LTE bandwidth can be divided into three combs (Comb),At a comb, LTE system does not send any signal, thereby can be for direct inspection on this combSurvey the signal energy from other system; And to two other comb, can Shi Liangge operator make respectivelyWith different combs, thereby LTE equipment can be collected by these two combs the LTE of different operatorsThe energy of signal.

Or, in the resource of measuring for channel status, whole system bandwidth is divided into many group subbands.Each group subband is to be distributed in system bandwidth, and each subband comprises continuous multiple subcarriers, for exampleThe sub-carrier resources that comprises one or more continuous PRB. A LTE equipment only can be at itIn send LTE signal on one group of subband, thereby can on different subbands, measure Different L TE systemOr the signal energy of other wireless system. As shown in figure 14, can distribute two groups of subbands, considerThe centre frequency of WiFi signal can be the frequency of arbitrary interval 5MHz, and two WiFi occupied bandwidths canTo only have the frequency overlap of about 1MHz, passable for measuring one group of subband of other wireless system signalThe core that is positioned at each 5MHz subband, for example about 6 PRB; Another subband is for inspectionSurvey the energy from other LTE signal.

Time division section A to Fig. 4 and the method for B, suppose that Channel Detection operation is confined to time period AIn, the above-mentioned method by the dissimilar signal energy of frequency division method distribution measurement only need to be in the timeIn section A, remain in advance measuring the resource of other wireless system, thereby can reduce resource overhead.

Embodiment seven

In a channel width exempting from licensed band, for other LTE system and other wireless systemCoexist, LTE equipment needs to detect channel status before transmitted signal, only have when channel idle and meetWhen LBT condition, could busy channel. Like this, base station can not know whether it can seize channel in advance,Correspondingly also just can not accurately indicate UE when to start reception information in this channel width. A kind of placeReason method is requirement UE continuous blind Detecting of carrying out in this channel width, but this causes waste ratioMore energy. Thereby two kinds of processing that send the method reduction UE of indication information at Pcell are described belowExpense.

First method, can send an indication information with Pcell is upper, for example with PDCCH orEPDCCH sends described indication information, and this indication information is used for notifying UE can start to detect leading letterNumber position. For example, on Pcell subframe n, send indication information, instruction UE can be from subframe n+kA moment start to detect targeting signal. Here be more than or equal to can in the value of 0, k and subframe k for kThe moment that starts to detect channel status depends on the time delay that UE processes PDCCH/EPDCCH.For example, suppose to send above-mentioned indication information with PDCCH, and PDCCH is mapped to subframe nFront m OFDM symbol,, UE receives after the indication information on Pcell at subframe n, supposes kEqual 0, UE can exempt from m the OFDM symbol of subframe n of licensed band LTE communityStart afterwards to detect targeting signal. Suppose that k is greater than 0, UE likely can be from exempting from licensed band LTEThe original position of the subframe n+k of community starts to detect targeting signal; Or, as shown in figure 15, receivingAfter Pcell indication information, suppose that UE can open from the 4th of a subframe n+k OFDM symbol hereBegin to detect channel. For example, suppose to send above-mentioned indication information with EPDCCH, k is more than or equal to 1.

The indication information that detects targeting signal according to above-mentioned instruction UE, can imply to indicate and seize channelThe position of the subframe of first possible transmission PDSCH of time period. For example, suppose that base station can beIn front m the OFDM symbol of subframe n+k, complete CCA and detect, first PDSCH subframeCan be early subframe n+k; Suppose the reality that base station can be after front m the OFDM symbol of subframe n+kIn the section of border, complete CCA and detect, first PDSCH can be located in subframe n+k+1 the earliest. ThisIn, even if UE detects above-mentioned Pcell indication information, also can not ensure that base station has necessarily sent leadingSignal. The beginning timing that in fact, whether can send targeting signal and targeting signal depends on base station inspectionThe busy-idle condition of the channel of surveying.

If when working as channel idle and meeting LBT condition, arrive the initial timing position of PDSCH,The i.e. not free targeting signal that sends, as shown in figure 16, base station can directly send PDSCH; Or,Also can be to continue to send targeting signal until the initial timing of next PDSCH just sends PDSCH.

If it is busy that the channel before the initial timing of PDSCH continues in state, base station can not takeChannel. As shown in figure 17, base station can not need again to send the Pcell of instruction UE detection targeting signalIndication information, but directly continue to detect channel status, and account in channel idle and while meeting LBT conditionUse channel. Or, if channel status is prepared to continue to detect in base station, need to be at the subframe n+1 of PcellAgain send above-mentioned indication information, notice UE can detect targeting signal at subframe n+1+k.

Receiving after Pcell indication information, UE starts to detect moment of targeting signal can be by LTE equipmentRealize and determining. This is because the beginning of PDSCH timing can only be generally first 4 of subframe starting positionOne of OFDM symbol, not oversize targeting signal fragment may meet the synchronous of UE andThe demand of the functions such as AGC, so in fact UE does not need too early to detect in advance targeting signal. If worked asTime and Frequency Synchronization and the AGC etc. of front UE is in good state, and UE even can skip targeting signalDetect, but direct-detection PDCCH/EPDCCH carrys out downlink data receiving.

If UE receiving after Pcell indication information, effective targeting signal detected, UE canStart to detect PDCCH/EPDCCH from first PDSCH place subframe and carry out downlink data receiving. AsFruit UE does not detect targeting signal, and UE can not detect in PDSCH place subframePDCCH/EPDCCH, because do not detect that a possible cause of targeting signal is that base station fails to seizeChannel. Or UE still detects PDCCH/EPDCCH in PDSCH place subframe, this is mainlyConsider two kinds of situations. The first situation is when channel idle and while meeting LBT condition, has arrivedThe initial timing position of PDSCH, causes the not free targeting signal that sends in base station just directly to sendPDSCH; The second situation is that UE fails to detect the targeting signal that base station sends, but becausePDSCH adopts mixed automatic retransfer request (HARQ) to retransmit, and UE still likely correctly receivesPDSCH. Here, can on Pcell, send another indication information with PDCCH/EPDCCH,Be used to indicate UE base station and whether successfully seized channel, thereby UE can obtain definite indication informationJudge whether to need blind Detecting PDCCH/EPDCCH to carry out downlink data receiving.

Second method, can send an indication information with Pcell, for example with PDCCH orEPDCCH sends described indication information, and this indication information is used for notifying UE can start blind DetectingPDCCH/EPDCCH comes the position of downlink data receiving. For example, on Pcell subframe n, send instructionInformation, instruction UE starts blind Detecting PDCCH/EPDCCH from subframe n+k and carrys out downlink data receiving.Here k is more than or equal to 0. The value of k depends on the time delay that UE processes PDCCH/EPDCCH.Here, above-mentioned Pcell indication information detected, UE need to be of Channel holding time or manyIn individual subframe, detect PDCCH/EPDCCH and corresponding PDSCH. But, even if UE detectsState Pcell indication information, also can not ensure that base station one is decided to be specific UE and has dispatched PDSCH. OneKind of possibility is but that base station has taken channel do not dispatch this UE in current subframe. AnotherPlanting possibility is, depends on the busy-idle condition of channel, and base station may not have successful busy channel numberReportedly defeated.

Suppose that base station support sends targeting signal, above-mentioned Pcell indication information, can imply and indicateThe position of targeting signal. In fact, the time period before the original position of the PDSCH of above-mentioned instruction justIt is the timing position that possible send targeting signal. According to this Pcell indication information, UE can directly examineSurvey PDCCH/EPDCCH and carry out downlink data receiving, and do not need to detect targeting signal; Or, UECan be in needs selective reception targeting signal.

Embodiment eight

Exempting from licensed band, for the coexisting of other LTE system and other wireless system, LTE establishesFor need to detect channel status before transmitted signal, when only having when channel idle and meeting the condition of LBT,LTE equipment just can carry out transfer of data by busy channel. Here, the time of LTE hold facility channel is longDegree can be one or more subframe. For example, according to European regulation, this Channel holding time canTo reach 10～13ms; And according to Japanese regulation, this time is the longest can only be about 4ms.

Suppose that the CCA detection in the channel width of exempting from licensed band can last till that the front m of subframe is individualOFDM symbol, m is less than or equal to 3, the PDSCH in LTE equipment is seized first subframe of channelCan be not from first OFDM sign-on transmission. And LTE equipment is seized to channel time sectionInterior non-the first subframe, in order to keep busy channel, LTE equipment need to be opened from first OFDM symbolStart and send data or transmit control signal.

According to analysis above, LTE equipment is seized first subframe and non-the first son in channel time sectionThe beginning OFDM symbol of the PDSCH of frame can be different. The following describes PDSCH initialThe processing method of OFDM symbol.

In this processing method, can be to configure respectively and seize first son in channel time section by RRC signalingThe initial OFDM symbol of the PDSCH of frame and non-the first subframe.

Or, seize the possibility of channel in order to maximize LTE equipment, can be first three of subframeOFDM symbol may be used to CCA, correspondingly, can fixedly think and seize first son after channelThe starting position of the PDSCH of frame is fixed as the 4th OFDM symbol. And to seizing non-after channelOne subframe, can be the initial OFDM symbol with the PDSCH of non-the first subframe of RRC signal deployment,For example, can reuse the initial OFDM symbol of the PDSCH of the configuration Scell in existing LTECA systemNumber RRC signaling.

Or, can reuse the initial OFDM of the PDSCH of the configuration Scell in existing LTECA systemThe RRC signaling of symbol, PDSCH initial of first subframe of channel time section seized in configurationOFDM symbol. And to seizing non-the first subframe after channel, LTE equipment is fixedly thought from firstOFDM sign-on transfer of data.

Or, seize the possibility of channel in order to maximize LTE equipment, can be first three of subframeOFDM symbol may be used to CCA and detects, and correspondingly, can fixedly think and seize the after channelThe original position of the PDSCH of a subframe is fixed as the 4th OFDM symbol. Further, forComplete the function of busy channel with PDSCH, can specify seizing non-the first subframe after channel,LTE equipment is fixedly thought from first OFDM sign-on transfer of data. Thereby, do not need RRCSignaling just can be determined the initial OFDM character position of the PDSCH that exempts from each subframe in licensed band.

Adopt above-mentioned three kinds of methods, UE need to know the position of first subframe of seizing channel time section.As can implying to indicate, the indication information of the instruction UE detection targeting signal in embodiment seven seizes channelThe position of the subframe of first possible transmission PDSCH of time period. Suppose that above-mentioned first is possibleChannel before the initial timing of PDSCH of PDSCH subframe continues in state busy, and supposes base stationDo not need to send new instruction UE and detect the Pcell indication information of targeting signal, but directly continue to detectChannel status, base station is likely to have sent in the subframe after above-mentioned first PDSCH subframePDSCH. To this situation, the channel subframe of first actual PDSCH is afterwards seized in base station,For fear of obscuring, base station can according to seize in channel time section except first subframe non-The method of one subframe arranges the initial OFDM symbol of PDSCH. Or base station can beWhether PDCCH/EPDCCH carry information is indicated current PDSCH subframe is Channel holding time sectionFirst subframe.

In some cases, UE may be able to not know for sure and seize first subframe of channel time sectionPosition. At this moment, can directly indicate tune by increase indication information in PDCCH/EPDCCHThe original position of the PDSCH of degree. For example, can indicate completely dynamically by increasing by 2 bit informationsGo out the initial OFDM symbol of PDSCH.

Or, can be also only to increase by 1 bit indication information. Can reuse joining in existing LTECA systemThe RRC signaling of putting the initial OFDM symbol of the PDSCH of Scell, semi-static configuration PDSCH's is initialThe position of OFDM symbol; It is according to semi-static configuration that above-mentioned 1 bit indication information can dynamically be indicated currentInitial OFDM symbol shines upon PDSCH, or from first OFDM sign-on mapping PDSCH.Adopt this method, to first subframe of busy channel, also provide two kinds of base stations initial OFDM symbolSelection, this is good with regard to the situation of having seized channel before subframe starts for LTE equipment. To accounting forBy non-first subframe of channel time section, still retain the selection of two kinds of initial OFDM symbols, thus canTo support the situation of the self scheduling in the channel width of exempting from licensed band with PDCCH.

Corresponding with said method, the invention also discloses a kind of LTE equipment, for carrying out said method. Figure18 is the one composition schematic diagram of LTE equipment of the present invention. This LTE equipment, comprising:

Channel Detection module 1801, estimates for carry out channel idle in a channel width exempting from licensed bandMeter CCA detects;

Data transmission module 1802, the channel clear detecting in above-mentioned channel width for basis,Whether corresponding decision carries out transfer of data, wherein: meet predetermined idle determination in described channel clearWhen condition, take respective channel and carry out transfer of data.

In addition, the each functional module in each embodiment of the present invention can be integrated in a processing unitIn, can be also that the independent physics of modules exists, also can two or more module integrations oneIn individual unit. Above-mentioned integrated unit both can adopt the form of hardware to realize, and also can adopt software meritThe form of energy unit realizes. The functional module of described each embodiment can be positioned at a terminal or network jointPoint, or also can be distributed on multiple terminals or network node.

In addition, each embodiment of the present invention can pass through by data processing equipment as computer executionData processor is realized. Obviously, data processor has formed the present invention. In addition storage conventionally,Data processor in a storage medium is by directly reading out program storage medium or passing throughBy installation or copy to data processing equipment memory device (as hard disk and or internal memory) in carry out.Therefore, such storage medium has also formed the present invention. Storage medium can use the record of any typeMode, such as paper storage medium (as paper tape etc.), magnetic storage medium are (as floppy disk, hard disk, flash memoryDeng), optical storage media (as CD-ROM etc.), magnetic-optical storage medium (as MO etc.) etc.

Therefore the invention also discloses a kind of storage medium, wherein store data processor, these dataHandling procedure is for carrying out any embodiment of said method of the present invention.

In addition, method step of the present invention is except realizing with data processor, all rightRealized by hardware, for example, can be by gate, switch, special IC (ASIC), can compileJourney logic controller and embedding microcontroller etc. are realized. Therefore thisly can realize the method for the inventionHardware also can form the present invention.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all at thisWithin the spirit and principle of invention, any amendment of making, be equal to replacement, improvement etc., all should be included inWithin the scope of protection of the invention.

Claims

1. a method for competitive channel resource in Long Term Evolution LTE communication system, is characterized in that, comprising:

2. method according to claim 1, is characterized in that,

Describedly in a channel width exempting from licensed band, carry out CCA detection, specifically comprise: to N kind notSignal of the same type carries out respectively CCA detection;

Described in the time that channel clear meets predetermined idle determination condition, take respective channel and carry out dataTransmission, specifically comprises: according to predefined N CCA detection threshold value, comprehensive above-mentioned N typeSignal CCA measured value and with the comparison of CA detection threshold separately, judge that whether LTE equipment passableBusy channel.

3. method according to claim 2, is characterized in that,

In the time of described N=2,

Describedly in a channel width exempting from licensed band, carry out CCA detection, specifically comprise: detect respectivelyFrom the energy E of LTE system_LAAWith other energy E_others；

In the time that described channel clear meets predetermined idle determination condition, take respective channel and carry out dataTransmission, specifically comprises: the energy from LTE system and other energy are adopted respectively to different detection thresholdJudge channel busy-idle condition; Work as E_othersBe less than Th_others, and E_LAABe less than Th_LAATime, LTE equipmentBusy channel carries out transfer of data; Wherein, described Th_LAAAnd Th_others; For predefined CCA detectsThreshold value.

4. method according to claim 2, is characterized in that,

In the time of described N=3,

Describedly in a channel width exempting from licensed band, carry out CCA detection, specifically comprise: detect respectivelyFrom with the energy E of the LTE system of the same operator of described LTE equipment_intra, from establishing with described LTEThe energy E of the LTE system of standby Bu Shiyige operator_interWith other energy E_others；

Described idle determination condition comprises three CCA detection threshold value, is designated as respectively Th_intra、Th_interWithTh_others；

In the time that described channel clear meets predetermined idle determination condition, take respective channel and carry out dataTransmission, specifically comprises: to the energy E of the LTE system from same operator_intra, from other operationThe energy E of business's LTE system_interWith other energy E_othersAdopt respectively different detection threshold to judge letterRoad busy-idle condition; Work as E_othersBe less than Th_others，E_interBe less than Th_interTime, and E_intraBe less than Th_intraTime,LTE hold facility channel carries out transfer of data; Described Th_intra、Th_interAnd Th_othersFor predefined threeIndividual CCA detection threshold value.

5. method according to claim 1, is characterized in that,

Describedly in a channel width exempting from licensed band, carry out CCA detection, be specially sometimesBetween detect channel status in resource; Described time resource is alternately divided into time period A and time period B;

Whether described decision carries out transfer of data, specifically comprises:

6. method according to claim 5, is characterized in that,

To time period A described in each, always restart LBT operation;

7. method according to claim 1, is characterized in that,

Describedly in a channel width exempting from licensed band, carry out CCA detection, be specially sometimesBetween detect channel status in resource, described time resource is alternately divided into time period A and time period B; LTEEquipment detects respectively channel status on each orthogonal frequency division multiplex OFDM symbol of time period A, whenChannel idle detected on n OFDM symbol time, account for from n+1 OFDM sign-onCarry out transfer of data with channel.

8. method according to claim 1, is characterized in that, the method further comprises:

In the time channel idle being detected and meet LBT condition, LTE equipment sends and comprises known arrayTargeting signal; Described targeting signal is made up of basic sequence; The length of described basic sequence equals oneThe length of OFDM symbol, or the length of described basic sequence equals CCA and detects section observing timeLength.

9. method according to claim 1, is characterized in that, when channel idle full being detectedWhen foot LBT condition, LTE equipment sends the targeting signal that comprises known array; Described targeting signalTime domain mapping is using a set time point as relative reference time point; Shine upon according to targeting signal delivery timeTo the position in LTE subframe, the start-stop timing of the OFDM symbol of targeting signal is corresponding with subframeOFDM symbol aligned.

10. method according to claim 1, is characterized in that,

In the time channel idle being detected and meet LBT condition, LTE equipment sends and comprises known arrayTargeting signal; And the method further comprises:

11. methods according to claim 1, is characterized in that,

In the time channel idle being detected and meet LBT condition, LTE equipment sends and comprises known arrayTargeting signal; The method also comprises:

12. methods according to claim 1, is characterized in that,

Targeting signal can be made up of the complete OFDM symbol of one or more LTE system, asThe moment that fruit meets channel occupancy condition can, not in the original position of an OFDM symbol, cut out leading letterNumber first OFDM symbol meet the part before Channel holding time.

13. methods according to claim 12, is characterized in that, the A part of targeting signal is rightP OFDM symbol before answering only takies 1 subcarrier and sends basic sequence in every N subcarrierA, and other N-1 subcarrier do not send any signal, N is integer, p is only for sending basic orderThe OFDM number of symbols of row A.

14. methods according to claim 12, is characterized in that, the B part of targeting signal is rightThe follow-up OFDM symbol of Ying Cong p+1 OFDM sign-on, specifically comprises:

B part is independent of downlink data transmission;

15. methods according to claim 14, the B part of targeting signal is supported transmission demodulation ginsengExamine signal, specifically comprise:

16. methods according to claim 14, targeting signal is divided into A part and B part, toolBody comprises:

17. methods according to claim 16, targeting signal is divided into A part and B part, toolBody comprises:

18. methods according to claim 14, the B part of targeting signal all or oneDivide the structure of shining upon targeting signal on OFDM symbol to fix.

19. methods according to claim 1, is characterized in that, described LTE equipment carries out CCADetect and specifically comprise: the energy of distinguishing signal with different type carries out respectively CCA detection, obtains inhomogeneityThe energy of type signal.

20. methods according to claim 19, is characterized in that,

The energy of described differentiation signal with different type carries out respectively CCA detection, obtains signal with different typeEnergy specifically comprise:

Obtain the energy of LTE signal by detecting targeting signal, use the total signal energy detecting to deductThe energy of above-mentioned LTE signal, using approximate this difference as the energy from other wireless system and otherThe energy of the LTE system that can not identify;

21. methods according to claim 19, is characterized in that,

22. methods according to claim 1, is characterized in that, the method further comprises:Base station in LTE equipment is with sending an indication information on main plot, this indication information is used for notifying LTEUE in equipment starts to detect the position of targeting signal.

23. methods according to claim 22, is characterized in that, in described LTE equipmentBase station is with after sending described indication information on main plot, when channel idle and while meeting LBT condition, asFruit has arrived the initial timing position of Physical Downlink Shared Channel PDSCH, the base in LTE equipmentStand erectly and receive and send PDSCH.

24. methods according to claim 22, is characterized in that, if initial fixed at PDSCHTime before channel continue in state busyly, channel status is continued to detect in the base station in LTE equipment,And busy channel carries out transfer of data in channel idle and while meeting LBT condition.

25. methods according to claim 1, is characterized in that, the method further comprises:Base station in LTE equipment is with sending an indication information on main plot, this indication information is used for notifying LTEUser equipment (UE) in equipment starts blind Detecting physical downlink control channel PDCCH/enhancing physical downControl channel EPDCCH comes the position of downlink data receiving.

26. methods according to claim 1, is characterized in that, the method further comprises:

27. methods according to claim 1, is characterized in that, the method further existsIn PDCCH/EPDCCH, increase by 1 bit indication information, this indication information is used to indicate according to semi-static configurationInitial OFDM symbol shines upon PDSCH, or is used to indicate from first OFDM sign-on mappingPDSCH。

28. 1 kinds of LTE equipment, is characterized in that, comprising: