CN107113275A - A kind of data transmission method, device and system - Google Patents

Abstract

The invention discloses a kind of data transmission method and device.In one embodiment, data transmission method includes：At least two symbols with first circulation prefix CP are received on first carrier；Wherein, the time span of the first CP is the first length；The first information is obtained, the first information includes the first length information；Obtain the thick timing information on first carrier；According to the thick timing information and the first information on the first carrier, first symbol at least two symbol on first carrier is carried out by the second length to go CP processing, other symbols at least two symbol in addition to first symbol are carried out by the first length to go CP processing；Wherein the second length is the arbitrary value less than the first length.

Description

A kind of data transmission method, device and system Technical field

The present embodiments relate to wireless communication technique more particularly to a kind of data transmission methods and device.

Background technique

In existing long term evolution (Long Term Evolution, LTE) in system, user equipment (User Equipment, UE) to evolved base station (the Evolutional Node B received, eNB or e-NodeB) before the data on some carrier wave are demodulated, it needs first to obtain and the other Time and Frequency Synchronization tracking of demodulation stae of the eNB on the carrier wave (i.e. smart Time and Frequency Synchronization tracking).Smart Time and Frequency Synchronization tracking is usually that the pilot signal sent by the period obtains.But under some specific scenes, such as eNB is using the carrier wave for exempting from licensed spectrum when being carried out data transmission, it cannot be guaranteed that the transmission of period pilot signal, therefore in receiving end, UE may have not been completed essence synchronization and just have received data to be demodulated, so as to cause the decline of data demodulation performance.

In addition, under some specific scenes, eNB sends Physical Downlink Control Channel (Physical Downlink Control CHannel to UE possibly also with different website or carrier wave,) and Physical Downlink Shared Channel (Physical Downlink Shared CHannel, PDSCH) PDCCH.Wherein, PDCCH carrying scheduling and other control information, specifically comprising transformat, resource allocation, Modulation and Coding Scheme information etc..UE needs to demodulate PDCCH first, and the PDSCH for belonging to UE oneself then can be demodulated on corresponding resource location.PDSCH symbol reach the receiving end UE may earlier than or be later than PDCCH symbol.When PDCCH symbol is later than PDSCH symbol, PDSCH symbol is demodulated by the timing of PDCCH symbol, can be interfered between created symbol, possibly can not correctly demodulate the data of PDSCH symbols carry, influence the efficiency of data transmission.

Summary of the invention

The embodiment of the present invention provides a kind of data transmission method, device and system, with the efficiency of improve data transfer.

In a first aspect, the embodiment of the invention provides a kind of data transmission methods, comprising:

At least two symbols with first circulation prefix CP are received on first carrier；Wherein, the time span of the first CP is the first length；

The first information is obtained, the first information includes the first length information；

Obtain the thick timing information on first carrier；

According to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length.

In the first possible implementation of the first aspect, first length is the time span of long loop prefix ECP, and second length is the time span of normal cyclic prefix NCP.

In the second possible implementation of the first aspect, second length is the half of first length.

With reference to first aspect or first aspect the first to second any one possible implementation, in the third possible implementation, obtaining the first information includes:

The first information is predefined information；Or

The signaling instruction for receiving the first information obtains the first information.

With reference to first aspect, or first aspect first to the third any one possible implementation, in the fourth possible implementation, the first information further includes the symbol numbers with the first CP, and/or, number of sub-frames with the first CP, and/or, the initial position of the symbol with the first CP.

With reference to first aspect or first to fourth kind of first aspect any one possible implementation obtains the thick timing information on first carrier in a fifth possible implementation, comprising:

The timing information on the second carrier wave is obtained, the thick timing information as first carrier；Wherein, the first carrier and second carrier wave are the carrier wave of same base station configuration；Alternatively, the first carrier and second carrier wave are the carrier wave that different base stations configures.

5th kind of possible implementation with reference to first aspect, in a sixth possible implementation, the frequency spectrum where the first carrier are to exempt from licensed spectrum, and the frequency spectrum where second carrier wave is licensed spectrum；Or

The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is to exempt from licensed spectrum；Or

The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is the licensed spectrum with frequency.

Any one possible implementation in 5th to the 6th kind with reference to first aspect, in the 7th kind of possible implementation, the data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；The first carrier and the second carrier wave are the carrier wave that different base stations configures, and the acquisition first information includes:

Information is indicated according to the PQI for including in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH, obtains the first information, wherein PQI instruction information is used to indicate the sub-frame formats information of the data frame on first carrier.

Any one possible implementation in 5th to the 6th kind with reference to first aspect, in the 8th kind of possible implementation, the data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；The acquisition first information includes:

According to the carrier indication information for including in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH, the first information is obtained, wherein the carrier indication information is used to indicate the sub-frame formats information of the data frame on first carrier.

With reference to first aspect, or first aspect first carries useful signal in received at least two symbols with the first CP in the 9th kind of possible implementation to the 8th kind of any one possible implementation, it include reference signal in the useful signal, the method also includes:

The Time and Frequency Synchronization information on the first carrier is estimated according to the reference signal.

9th kind of possible implementation with reference to first aspect, in the tenth kind of possible implementation, the method also includes:

Frequency domain phase compensation is carried out to the useful signal according to the Time and Frequency Synchronization information on the first carrier of the estimation；Or

Demodulation process is carried out to the symbol received after at least two symbol according to the Time and Frequency Synchronization information on the first carrier of the estimation.

With reference to first aspect or first aspect first is to the tenth kind of any one possible implementation, and in a kind of the tenth possible implementation, the reference signal in the useful signal includes following at least one information:

Public reference signal, demodulated reference signal, channel state information reference signals find reference signal；

Also include data-signal in the useful signal, the data-signal in the useful signal include with down toward A kind of few information:

Physical Downlink Control Channel, the Physical Downlink Control Channel of enhancing, Physical Downlink Shared Channel.

Second aspect, the embodiment of the invention provides a kind of terminals, comprising:

Receiver, for receiving at least two symbols with first circulation prefix CP on first carrier, and；Wherein, the time span of the first CP is the first length；

Processing unit, for obtaining the thick timing information on the first information and first carrier, according to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length；The first information includes the first length information.

In the first possible implementation of the second aspect, the first length is the time span of long loop prefix ECP, and second length is the time span of normal cyclic prefix NCP.

In a second possible implementation of the second aspect, second length is the half of first length.

In conjunction with second aspect or second aspect the first or second of possible implementation, in the third possible implementation, the processing unit is specifically used for: according to the predefined information acquisition first information；Or

The processing unit is specifically used for: the signaling instruction for receiving the first information obtains the first information.

In conjunction with second aspect, or second aspect first to the third any one possible implementation, in the fourth possible implementation, the first information further includes the symbol numbers with the first CP, and/or, number of sub-frames with the first CP, and/or, the initial position of the symbol with the first CP.

In conjunction with second aspect or first to fourth kind of second aspect any one possible implementation, in a fifth possible implementation, the processing unit is specifically used for:

The timing information on the second carrier wave is obtained, the thick timing information as first carrier；Wherein, the first carrier and second carrier wave are the carrier wave of same base station configuration；Alternatively, the first carrier and second carrier wave are the carrier wave that different base stations configures.

It is in a sixth possible implementation, described in conjunction with the 5th kind of possible implementation of second aspect Frequency spectrum where first carrier is to exempt from licensed spectrum, and the frequency spectrum where second carrier wave is licensed spectrum；Or

The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is to exempt from licensed spectrum；Or

The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is the licensed spectrum with frequency.

In conjunction with any one possible implementation in the 5th kind of possible implementation of second aspect and the 6th kind of possible implementation, in the 7th kind of possible implementation, data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；The first carrier and the second carrier wave are the carrier wave that different base stations configures；

The processing unit, information is indicated specifically for the PQI for including in the scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, the first information is obtained, wherein PQI instruction information is used to indicate the sub-frame formats information of the data frame on first carrier.

In conjunction with any one possible implementation in the 5th kind of possible implementation of second aspect and the 6th kind of possible implementation, in the 8th kind of possible implementation, data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；

The processing unit, specifically for the carrier indication information for including in the scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, obtain the first information, wherein the carrier indication information is used to indicate the sub-frame formats information of the data frame on first carrier.

In conjunction with second aspect first to any one possible implementation in the 8th kind, in the 9th kind of possible implementation, useful signal is carried in received at least two symbols with the first CP, it include reference signal in the useful signal, the processing unit is also used to, and the Time and Frequency Synchronization information on the first carrier is estimated according to the reference signal.

In conjunction with the 9th kind of possible implementation of second aspect, in the tenth kind of possible implementation, the processing unit is also used to: carrying out frequency domain phase compensation to the useful signal according to the Time and Frequency Synchronization information on the first carrier of the estimation；Or

Demodulation process is carried out to the symbol received after at least two symbol according to the Time and Frequency Synchronization information on the first carrier of the estimation.

In conjunction with second aspect first to any one possible implementation in the tenth kind, in a kind of the tenth possible implementation, the reference signal in the useful signal includes following at least one information:

Public reference signal, demodulated reference signal, channel state information reference signals find reference signal；

Also include data-signal in the useful signal, the data-signal in the useful signal includes following at least one information:

Physical Downlink Control Channel, the Physical Downlink Control Channel of enhancing, Physical Downlink Shared Channel.

The third aspect, the embodiment of the invention provides a kind of data transmission methods, comprising:

Sending device sends at least one symbol with long loop prefix ECP since at the time of obtaining the channel access right on the first carrier for exempting from licensed spectrum to receiving device；

The sending device notifies the second information to the receiving device；Second information includes the CP format of at least one symbol.

In the first possible implementation of the third aspect, the sending device notifies the second information described in the receiving device by way of predefined or signal.

In conjunction with the third aspect or the third aspect the first possible implementation, in the second possible implementation, second information further include:

Symbol numbers with ECP, and/or, the number of sub-frames with ECP, and/or, the initial position of the symbol with ECP.

Fourth aspect, the embodiment of the invention provides a kind of sending devices, comprising:

Transmitter, for sending at least one symbol with long loop prefix ECP to receiving device since at the time of obtaining the channel access right on the first carrier for exempting from licensed spectrum；

Notification unit, for notifying the second information to the receiving device；Second information includes the CP format of at least one symbol.

In the first possible implementation of the fourth aspect, the notification unit notifies the second information described in the receiving device by way of predefined or signal.

In conjunction with fourth aspect or fourth aspect the first possible implementation, in the second possible implementation, second information further include:

Symbol numbers with ECP, and/or, the number of sub-frames with ECP, and/or, the initial position of the symbol with ECP.

One embodiment of the invention, when UE only obtain it is thick synchronous just have received it is to be demodulated by the first CP length When the data of transmission, UE is with reference to slightly synchronous timing information, CP is carried out using first symbol of the CP length shorter than the first CP length to data frame to handle, CP is carried out by the first CP length to other symbols for removing first outer symbol in data frame to handle, it can be interfered created symbol to avoid between data frame when carrying out CP and handling, and then improve the performance of data processing.

Detailed description of the invention

The flow diagram of Fig. 1 data transmission method one embodiment provided by the invention

Fig. 2 a is an application scenarios of data transmission method provided by the invention；

Fig. 2 b is another application scenarios of data transmission method provided by the invention；

Fig. 3 is the flow diagram of another embodiment of data transmission method provided by the invention；

Fig. 4 is the schematic diagram of processing method one embodiment that UE receives data frame；

Fig. 5 is the schematic diagram that UE receives another embodiment of the processing method of data frame；

Fig. 6 is another application scenarios of data transmission method provided by the invention；

Fig. 7 is the flow diagram of another embodiment of data transmission method provided by the invention；

Fig. 8 is the schematic diagram that UE receives another embodiment of the processing method of data frame；

Fig. 9 is the structural schematic diagram of one embodiment of terminal provided by the invention；

Figure 10 is the structural schematic diagram of one embodiment of terminal provided by the invention；

Figure 11 is the flow diagram of another embodiment of data transmission method provided by the invention；

Figure 12 is the structural schematic diagram of one embodiment of sending device provided by the invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.

Technical solution of the present invention, it can be applied to various communication systems, such as: global system for mobile communications (GSM, Global System of Mobile communication), CDMA (CDMA, Code Division Multiple Access) system, wideband code division multiple access (WCDMA, Wideband Code Division Multiple Access Wireless), General Packet Radio Service (GPRS, General Packet Radio Service), long term evolution (LTE, Long Term Evolution), senior long term evolution (LTE-A, Long Term Evolution-Advanced), license auxiliary access long term evolution (LAA-LTE, Licensed-Assisted Access Using LTE) system, mechanical type communicates (MTC, Machine Type Communications) etc..

In an embodiment of the present invention, user equipment (UE), also referred to as terminal (Terminal), mobile station (Mobile Station), mobile terminal (Mobile Terminal), mobile subscriber equipment etc., can through wireless access network (such as, RAN, Radio Access Network) it is communicated with one or more core nets, user equipment can be mobile terminal, such as mobile phone (or be " honeycomb " phone) and the computer with mobile terminal, such as, it can be portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device, either mechanical type communication equipment (MTC UE), etc., they exchange voice and/or data with wireless access network.

In an embodiment of the present invention, base station can be evolved base station eNB, macro base station (Macro), micro-base station (also referred to as " small base station ") (Pico), femto base station, access website (Access Point in LTE system or LAA-LTE system, AP) or transmit website (Transmission Point, TP) etc..The present invention does not limit this.But for convenience of description, following embodiments will be illustrated by taking base station and user equipment as an example.

In existing wireless communication field, frequency spectrum resource is broadly divided into two kinds, and one kind is licensed spectrum resource, and another kind is to exempt from licensed spectrum resource.Licensed spectrum resource delimited by the Wireless Management Committee of government, there is the frequency spectrum resource of specific purpose, such as mobile operator use, civil aviaton, railway, the dedicated frequency spectrum resource of police, due to the exclusiveness in policy, the quality of service of licensed spectrum resource is generally obtained guarantee, also relatively easy when being scheduled control.

Exempting from licensed spectrum resource is also the frequency spectrum resource delimited by departments of government, but is not defined to radio technology, operation enterprise and service life, while also not guaranteeing the quality of service of the frequency range.It only needs to meet transmission power, the requirement with indexs such as outward leakages using the communication equipment for exempting from licensed spectrum resource, can freely use.It includes civilian intercom, radio remote controller, Wi-Fi system, Bluetooth communication system etc. that the communication system that licensed spectrum resource is communicated is exempted from common application.

In existing LTE system, frequency spectrum resource used in operator is mainly licensed spectrum resource；The raising of requirement with the increase and user of mobile communications network number of users to traffic rate, service quality, existing licensed spectrum resource have been difficult to meet the demand of the existing business of operator.In view of new Licensed spectrum is at high price, resource scarcity, operator, which starts to turn one's attention to, to exempt from licensed spectrum resource, it is desired to be able to shunt, improves service quality by achieving the purpose that network capacity using licensed spectrum resource is exempted from.Exempt to permit long term evolution (Unlicensed Long Term Evolution, U-LTE), or license auxiliary access long term evolution (Licensed-Assisted Access Using LTE, abbreviation: LAA-LTE) systematic research is to exempt from licensed spectrum resource in order to which LTE can be applied to.

The research of license auxiliary access long evolving system LAA-LTE mainly polymerize (Carrier Aggregation using the carrier wave of existing LTE system, CA) the configuration and structure in scene, to configure based on the carrier wave in operator's licensed spectrum communicated, at least one is configured to UE and exempts from the carrier wave in licensed spectrum and is that auxiliary carries out exempting from the communication on the carrier wave in licensed spectrum with the communication of the carrier wave in licensed spectrum.According to the design of existing LTE system, different carrier waves is sub-frame boundary alignment when carrying out data communication under carrier aggregation scene.

In LAA-LTE system, the problem of the use of exempt from licensed spectrum resource to first have to solve the problems, such as being competitive resource.A kind of method of competitive resource is first to detect to send (Listen Before Talk, LBT) afterwards.The basic thought of LBT are as follows: each communication equipment is sent on some channel before signal, it whether idle needs first to detect present channel, whether can detecte neighbouring node and occupies the channel transmission signal, this detection process is referred to as idle channel evaluation and test (Clear Channel Assessment, CCA)；If detecting channel idle whithin a period of time, which can send signal；If detecting that channel is occupied, which currently can not just send signal.Specifically, LBT mechanism is divided into the LBT mechanism of the LBT mechanism of the equipment (Frame based equipment, FBE) based on frame and the equipment (Load based equipment, LBE) based on load according to the regulation of European directive again.The characteristics of LBT mechanism based on FBE is that equipment always carries out CCA detection in fixed time, once detecting channel idle, equipment carries out signal transmission with the fixed frame period, therefore the initial time that data are sent under this mechanism is at the predefined moment；The characteristics of LBT mechanism based on LBE is, equipment can carry out CCA detection at any time, but once detect that channel is occupied, or transmission reach system permission maximum transmission time when, need to extend the time of CCA detection, the initial time that data are sent under this mechanism can be any time.

In LAA-LTE system, since eNB will first judge that channel idle could be using the resource for exempting from licensed spectrum, therefore signal transmission of the eNB on the carrier wave for exempting from licensed spectrum is opportunistic transmission and discontinuous transmission, to have no idea to guarantee the transmission of period pilot signal.So from the point of view of receiving end, UE may be Complete and eNB exempt from the carrier wave in licensed spectrum essence it is synchronous before, it is necessary to receive conciliate transfer from the carrier wave transmission data, so as to cause the decline of data demodulation performance.

In LAA-LTE system, the carrier wave in licensed spectrum is the main carrier Pcell of UE, so UE can always obtain the smart Time and Frequency Synchronization with the carrier wave in licensed spectrum.Due to the carrier wave in licensed spectrum and exempts from the carrier wave in licensed spectrum and defer to CA mechanism when sending data, that is eNB is sub-frame boundary alignment in the carrier wave in licensed spectrum and when exempting from and sending data on carrier wave in licensed spectrum, therefore UE can be the smart Time and Frequency Synchronization obtained from the carrier wave in licensed spectrum as the thick Time and Frequency Synchronization on the carrier wave exempted from licensed spectrum.But the thick Time and Frequency Synchronization information is directly used for data demodulation, it is understood that there may be the case where can not correctly solving adjusting data.Based on this, the embodiment of the invention provides a kind of in the case where being only capable of obtaining thick synchronization guarantees the method for data demodulation performance.

It should be understood that LTE system locating for base station that the embodiment of the present invention refers to and user equipment, lte-a system or LAA-LTE system are the communication systems with fixed sub-frame formats.In the communication system, it is assumed that minimum time unit is T_s, 1T_s=1/ (15000 × 2048) second；The time span of one subframe (subframe) is 1 millisecond, i.e., a subframe lengths are 30720 × T_s；One subframe includes multiple orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol.One OFDM symbol includes cyclic prefix (Cyclic Prefix, CP) partially with message segment part, and wherein message segment part includes all information of an OFDM symbol, and CP is the repetition to a part of information segment signal；The time span of the message segment part of one OFDM symbol is 2048 × T_s, it is approximately equal to 66.7 microseconds.The communication system supports two kinds of fixed sub-frame formats, one is normal cyclic prefix (Normal Cyclic Prefix, NCP) sub-frame formats, one NCP subframe includes 14 OFDM symbols, by OFDM symbol since 0 label to 13, then wherein the CP length of No. 0 and No. 7 OFDM symbol is 160 × Ts, and the CP length of remaining 12 OFDM symbol is 144 × Ts；No. 0 to No. 6 OFDM symbol is defined as odd numbered slots, No. 7 to No. 13 OFDM symbol is defined as even timeslots.Another kind is long loop prefix (Extended Cyclic Prefix, ECP) sub-frame formats, and an ECP subframe includes 12 OFDM symbols, wherein the CP length of each symbol is 512 × Ts；By OFDM symbol, No. 0 to No. 5 OFDM symbol is defined as odd numbered slots, is defined as even timeslots for No. 6 to o.11 OFDM symbol by label to 11 since 0.In the embodiment of the present invention and other embodiments of the invention, OFDM symbol is also called symbol for short；Normal cyclic prefix NCP is also referred to as short CP, and corresponding sub-frame formats are referred to as NCP sub-frame formats or short CP sub-frame formats；Long loop prefix ECP is also claimed For long CP, corresponding sub-frame formats are referred to as ECP sub-frame formats or long CP sub-frame formats.

It should be understood that in a communications system, it is to guarantee one of voice communication and the key factor of data connection reliability that Time and Frequency Synchronization, which includes Timing Synchronization and Frequency Synchronization,.The communication system that the embodiment of the present invention refers to is ofdm system, signal demodulation is more sensitive to timing error and frequency departure: timing error may cause intersymbol interference, the frequency departure compensation of inaccuracy may destroy the orthogonality between subcarrier, to generate inter-carrier interference and multiple access interference.Therefore it before communication link is set up in UE and base station, needs to complete the Time and Frequency Synchronization with base station, to reduce influence of the Time and Frequency Synchronization error to UE demodulation performance.In the communication system that the embodiment of the present invention refers to, Time and Frequency Synchronization is divided into thick Time and Frequency Synchronization (Coarse time and frequency synchronization) and smart Time and Frequency Synchronization (Fine time and frequency synchronization).Following behavior example, UE needs first to complete thick Time and Frequency Synchronization when being usually initially accessed, timing error and frequency bias control can guarantee wireless resource management (Radio Resource Management by thick Time and Frequency Synchronization by UE, RRM) in the range of the measurement accuracy meet demand measured, and frame timing information is obtained.Since RRM measurement is insensitive to timing error and frequency departure, required thick Time and Frequency Synchronization is not able to satisfy the demand of signal demodulation, and further, UE needs to obtain and the smart Time and Frequency Synchronization of base station.Specifically, UE can be timed estimation and frequency offset estimation by receiving the pilot signal of Base Transmitter, the demodulation in the range of Time and Frequency Synchronization error is reduced to signal demodulation tolerable, for downlink data.Further, UE can pass through the Time and Frequency Synchronization information of periodic timing estimation and frequency offset estimation tracking base stations.UE can obtain thick timing information during thick Time and Frequency Synchronization, and smart timing information can be obtained during smart Time and Frequency Synchronization.

With reference to Fig. 1, one embodiment of data transmission of the present invention includes:

Step S101: receiving device receives at least two symbols with first circulation prefix CP that transmitting equipment is sent on first carrier；Wherein, the time span of the first CP is the first length；

Optionally, the transmitting equipment can be base station or UE.

Optionally, the receiving device can be UE or base station.

In one embodiment, the first CP is ECP, and corresponding first length is the time span of ECP.In another embodiment, the first CP is NCP, and corresponding first length is the time span of NCP.In another embodiment, the first CP is ECP, and corresponding first length is the time span of ECP.

S102: receiving device obtains the first information, which includes the first length information；

Optionally, it may include: that receiving device from the sub-frame formats of predefined symbol transmission obtains the first information that the receiving device, which obtains the mode of the first information,.In another embodiment, the mode that receiving device obtains the first information may include: that receiving device receives the instruction information for emitting the sub-frame formats that equipment is sent, according to the instruction information acquisition first information；Wherein, the instruction information can be the display that transmitting equipment is sent or implicit indication signaling.

During specific implementation step S102, optionally, the first information further includes the symbol numbers information with the first CP, and/or, the number of sub-frames information with the first CP, and/or, the initial position of the symbol with the first CP.

Step S103: the receiving device obtains the thick timing information on first carrier；

During specific implementation step S103, the thick timing information on the first carrier is the timing synchronisation information in thick Time and Frequency Synchronization.Optionally, the thick timing information is able to satisfy requirement of the RRM measurement accuracy to Timing Synchronization.Optionally, the thick timing information is the frame timing information on first carrier.Optionally, the thick timing information is the symbol timing information on first carrier.

In one embodiment, which includes: the timing information obtained on the second carrier wave, the thick timing information as first carrier.

In the communication system that the embodiment of the present invention refers to, multiple carrier waves can be used for transmitting equipment and receiving device is communicated.When transmitting equipment is communicated using multiple carrier waves and receiving device, signal transmitting on different carrier waves is that sub-frame boundary is aligned, the signal on different carrier waves that receiving device receives is in time mainly by the influence of signal transmission delay, therefore the timing information of any one carrier wave all can serve as the thick timing information of other carrier waves in multicarrier in multicarrier.In addition, it is required according to RF index, when transmitting equipment is communicated using multiple carrier waves and the same receiving device, no matter it is one or multiple for emitting equipment, require to carry out frequency calibration to meet frequency deviation index, therefore the frequency deviation information of any one carrier wave all can serve as the coarse frequency offset information of other carrier waves in multicarrier in multicarrier.During specific implementation step S103, optionally, the receiving device obtains the thick timing information on first carrier by the second carrier wave.

In one embodiment, the frequency spectrum where first carrier is to exempt from licensed spectrum, and the frequency spectrum where the second carrier wave is licensed spectrum.In another embodiment, the frequency spectrum where frequency spectrum and the second carrier wave where first carrier is to exempt from licensed spectrum.In another embodiment, the frequency spectrum where frequency spectrum and the second carrier wave where first carrier is the licensed spectrum with frequency.

In one embodiment, the first carrier and the second carrier wave are the carrier wave of same base station configuration；Another In embodiment, the first carrier and the second carrier wave are the carrier wave that different base stations configures.

In one embodiment, the data frame on first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；First carrier and the second carrier wave are the carrier wave that different base stations configures, obtaining the first information includes: the PQI instruction information for including in scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, the first information is obtained, wherein PQI instruction information is used to indicate the sub-frame formats information of the data frame on first carrier.

In another embodiment, the data frame on first carrier carries EPDCCH/PDSCH information, and the data frame on the second carrier wave carries PDCCH information；The first information that obtains includes: the carrier indication information for including in scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, obtain the first information, wherein, the carrier indication information is used to indicate the sub-frame formats information of the data frame on first carrier.

Step S104: the receiving device carries out CP at least two symbols on first carrier and handles according to thick timing information and the first information on the first carrier.

Specifically, the receiving device is according to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbols in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length.

During specific implementation step S104, optionally, the receiving device determines the initial time of first symbol at least two symbol using the thick timing information and the first information of the first carrier of acquisition, removed in first symbol at least two symbol by the part of the second length the initial time as CP, and the time span for intercepting the message segment part of a symbol is used for demodulation process as the valid data part of first symbol.Using the finish time after the valid data for intercepting first symbol as the initial time of second symbol, removed second symbol by the part of the first length the initial time of second symbol as CP, and the time span for intercepting the message segment part of a symbol is used for demodulation process as the valid data part of second symbol.CP is carried out by the processing mode of second symbol to other symbols at least two symbols in addition to first symbol to handle and obtain the valid data part of other symbols for demodulation process.

During specific implementation step S104, according to one embodiment, the first CP is long loop prefix ECP, and first length is the time span of ECP, and second length is before normal circulation Sew the time span of NCP.Specifically, the receiving device using on the first carrier of acquisition thick timing information and the first information determine that the initial time of first symbol in received at least two symbols with the first CP, the receiving device carry out the initial time that CP is handled and obtained second symbol to first symbol according to the initial time and second length of first symbol of the determination；The receiving device carries out CP to other symbols in addition to first symbol according to the initial time and first length of second symbol of the determination and handles.The maximum transmitted time delay for the channel multi-path that the receiving device at least can permit when handling the symbol is the second length.When the time difference of the thick timing in the essence timing of the signal from first carrier and first carrier is in [- (L_E-L_N), L_N] in range when, the receiving device not will receive the intersymbol interference as caused by the time difference when handling the symbol.Wherein, L_EIndicate the time span of ECP, L_NIndicate the time span of NCP.

During the step is embodied, according to another embodiment, the first CP is NCP, and first length is the time span of NCP；Or the first CP is ECP, first length is the time span of ECP.Second length is any time length less than first length.Optionally, the second length can be determined by the coverage area of first carrier.For example, the first CP is NCP, first length is the time span of NCP, and second length is the half of the first length.The receiving device determines the initial time of first symbol in received at least two symbols with the first CP using the thick timing information and the first information of the first carrier of acquisition, the receiving device carries out the initial time that CP is handled and obtained second symbol to first symbol according to the initial time of first symbol of the determination and the length of 1/2 NCP, and the receiving device carries out CP to other symbols in addition to first symbol and handle according to the initial time of second symbol of the determination and the length of the NCP.The maximum transmitted time delay for the channel multi-path that the receiving device at least can permit when handling the symbol is 1/2 × L_N.When the time difference of the thick timing in the essence timing of the signal from first carrier and first carrier is in [- 1/2 × L_N, 1/2 × L_N] in range when, the receiving device not will receive the intersymbol interference as caused by the time difference when handling the symbol.Wherein, L_NIndicate the time span of NCP.

Optionally, when the first information further includes the initial position of the symbol of the first CP, then UE is handled according to the start position information of first symbol in available at least two symbol of this information to carry out CP at least two symbol.

Optionally, when the first information further includes the symbol numbers with the first CP, and/or, have first When the number of sub-frames of CP, then UE is handled according to the available specific symbol numbers of at least two symbols of this information to carry out CP at least two symbol.

In the embodiment, in the case where only obtaining the thick timing information of first carrier, when handling the symbol sent by the first CP length received on first carrier, CP is carried out by the length shorter than the first CP length to first symbol to handle, CP is carried out by the first CP length to other symbols except first outer symbol to handle, it can be to avoid carrying out interfering created symbol when CP is handled between the symbol on the first carrier, to reduce the influence of bad timing bring, the performance of data processing is improved.

In another embodiment, the data transmission method further include:

Step S105: carrying useful signal in received at least two symbols with the first CP of the receiving device, includes reference signal in the useful signal；Receiving device estimates the Time and Frequency Synchronization information on the first carrier according to the reference signal.

In the specific implementation process, optionally, the useful signal may include reference signal and data-signal.Optionally, reference signal in the useful signal includes following at least one information: public reference signal (Common Reference Signal, CRS), demodulated reference signal (Demodulation Reference Signal, DMRS), channel state information reference signals (Channel State Information-Reference Signal, CSI-RS), reference signal (Discovery Reference Signal, DRS) is found；Optionally, it also include data-signal in the useful signal, data-signal in the useful signal includes following at least one information: Physical Downlink Control Channel (Physical Downlink Control CHannel, PDCCH), Physical Downlink Control Channel (the Enhanced-Physical Downlink Control CHannel enhanced, ePDCCH), Physical Downlink Shared Channel (Physical Downlink Shared CHannel, PDSCH).

In the specific implementation process, optionally, the Time and Frequency Synchronization information on the first carrier is smart Time and Frequency Synchronization information, for estimating that the reference signal of the Time and Frequency Synchronization information on the first carrier can be CRS, and/or DMRS and/or CSI-RS and/or DRS.

It should be understood that receiving device can estimate frequency deviation in such a way that the reference signal to separated in time matches estimation phase difference when estimating smart Time and Frequency Synchronization information.In conjunction with the system parameter of LAA-LTE system, in order to obtain the smart Frequency Synchronization that can guarantee demodulation performance, for estimating the reference signal interval time length of frequency deviation not less than 3 symbols, preferably, for estimating that the reference signal interval time length of frequency deviation is 4 symbols, i.e. receiving end can use n-th₀A symbol and n-th₀Reference signal on+3 symbols, which is combined, to be carried out Offset estimation, n₀For any one notation index.Optionally, in the specific implementation process, the reference signal interval time length for being used to estimate frequency deviation carried in the symbol with the first CP is more than or equal to 4 symbols.

After obtaining the Time and Frequency Synchronization information on first carrier, optionally, the receiving device can carry out frequency domain phase compensation to the useful signal according to the Time and Frequency Synchronization information on the first carrier.Optionally, the receiving device carries out frequency domain phase compensation according to symbol of the Time and Frequency Synchronization information on the first carrier to the carrying useful signal for removing CP.By frequency domain phase compensation, the influence that the time-frequency deviation of the thick Time and Frequency Synchronization in the smart Time and Frequency Synchronization and first carrier of the signal from first carrier demodulates the useful signal can reduce, to guarantee its demodulation performance.

After obtaining the Time and Frequency Synchronization information on first carrier, optionally, the receiving device can carry out demodulation process to the symbol received after at least two symbol on first carrier according to the Time and Frequency Synchronization information on the first carrier of the estimation.

An application scenarios of the invention are the scene that LAA-LTE technology uses.With reference to Fig. 2 a and 2b, the system of one embodiment of the invention includes multiple terminal UEs in multiple base station eNBs and its coverage area；The carrier wave CC1 that at least one terminal is configured in licensed spectrum exempts from the carrier wave CC2 in licensed spectrum at least one.As shown in Figure 2 a, the carrier wave in licensed spectrum and at least one exempt from the carrier wave in licensed spectrum and can be to be configured by the same base station.As shown in Figure 2 b, the carrier wave in licensed spectrum and at least one exempt from what the carrier wave in licensed spectrum was also possible to be configured by different base station.If the carrier wave in licensed spectrum with the carrier wave exempted from licensed spectrum is configured by different base stations, it can be transmitted and be interacted by ideal backhaul between different base stations, can also transmitted and be interacted by non-ideal backhaul.Base station can be used carrier wave CC2 that the carrier wave CC1 in licensed spectrum exempts from at least one in licensed spectrum and send data to UE.Signal transmission of the base station in licensed spectrum resource and the carrier wave for exempting from licensed spectrum resource is that sub-frame boundary is aligned in time.ENB when using exempting from carrier resource in licensed spectrum and sending out data to UE, need first to judge this exempts from the carrier wave free time in licensed spectrum can be with could use.UE has been obtained for the smart Time and Frequency Synchronization with eNB on carrier wave in licensed spectrum before using secondary carrier in licensed spectrum is exempted from, this, which is synchronized, may be used as UE and eNB and exempting from the thick Time and Frequency Synchronization on the carrier wave in licensed spectrum.

It should be understood that the technical solution of the embodiment of the present invention can be applied to also can be applied to other using the LAA-LTE system for exempting from licensed band with similar therewith, fixed sub-frame boundary or symbol Boundary and the communication system with resource contention demand.

With reference to Fig. 3, one embodiment of data transmission method of the present invention can be applied to LAA-LTE system, and this method includes:

Step S301: receiving device receives at least two symbols with first circulation prefix CP that transmitting equipment is sent on first carrier；Wherein, the time span of the first CP is the first length, and the frequency spectrum where the first carrier is to exempt from licensed spectrum；

During specific implementation step S301, optionally, the transmitting equipment is base station.

During specific implementation step S301, optionally, the receiving device can be UE or base station.

In one embodiment, transmitting equipment be by obtain exempt from licensed spectrum channel the right to use after by the first CP sub-frame formats send symbol.Specifically, transmitting equipment can obtain the right to use for exempting from the channel of licensed spectrum by the method for competition；More specifically, transmitting equipment can obtain the right to use by the method for competition based on the criterion of LBT.Or after transmitting equipment can be by coordinating or dispatching with neighbouring communication equipment, obtain the right to use for exempting from the channel of licensed spectrum.Or transmitting equipment can use pattern by preconfigured resource, obtain the right to use for exempting from the channel of licensed spectrum.

During specific implementation step S301, optionally, the first CP is ECP, and corresponding first length is the time span of ECP.Alternatively, optional, the first CP is NCP, and corresponding first length is the time span of NCP.

Although the signal transmission of multicarrier is that sub-frame boundary is aligned in time it should be understood that transmitting equipment can be any time at the time of obtaining the right to use for the channel for exempting from licensed spectrum.Consider that the LAA-LTE system can send signal by symbol, emitting the initial time that signal of the equipment on the channel for exempting from licensed spectrum is sent can be the initial time of any one subframe, or the sub-frame formats with the first CP any one symbol initial time.

During specific implementation step S301, optionally, when being the initial time of any one subframe at the time of the right to use for the channel that licensed spectrum is exempted from transmitting equipment acquisition, the duration for the symbol with the first CP that the transmitting equipment is sent includes at least one complete subframe.Further, the symbol with the first CP that the transmitting equipment is sent is sent by subframe.

During specific implementation step S301, optionally, when licensed spectrum is exempted from transmitting equipment acquisition When being the initial time of any one symbol of the sub-frame formats with the first CP at the time of the right to use of channel, it is assumed that the symbol numbers with the first CP that the initial time of the initial time first subframe after the initial time can transmit are N.If N is not less than M, the duration for the symbol with the first CP that the transmitting equipment is sent includes at least N number of symbol；If N is less than M, the duration for the symbol with the first CP that the transmitting equipment is sent includes at least N number of symbol and next complete subframe.Wherein the N value may be 1 to 14 positive integer.The M is symbol numbers needed for obtaining the smart Time and Frequency Synchronization of LAA-LTE system, and the value of M may be 4 to 14 positive integer, it is preferred that M value is 4.

S302: receiving device obtains the first information, and the first information includes the first length information；

In one embodiment, the mode that the receiving device obtains the first CP information may include: that receiving device from the sub-frame formats of predefined symbol transmission obtains the first CP information.In another embodiment, the mode that receiving device obtains the first CP information may include: that receiving device receives the instruction information for emitting the sub-frame formats that equipment is sent, according to the first CP information of instruction information acquisition；Wherein, the instruction information can be the display of base station transmission or implicit indication signaling.

During specific implementation step S302, optionally, the first CP information further includes the symbol numbers information with the first CP, and/or, the number of sub-frames information with the first CP, and/or, the initial time of the symbol with the first CP.

Step S303: the receiving device obtains the timing information on the second carrier wave；

It should be understood that multiple carrier waves can be used for transmitting equipment and receiving device is communicated in LAA-LTE communication system.When transmitting equipment is communicated using multiple carrier waves and receiving device, signal transmitting on different carrier waves is that sub-frame boundary is aligned, the signal on different carrier waves that receiving device receives is in time mainly by the influence of signal transmission delay, therefore the timing information of any one carrier wave all can serve as the thick timing information of other carrier waves in multicarrier in multicarrier.In addition, it is required according to RF index, when transmitting equipment is communicated using multiple carrier waves and the same receiving device, no matter it is one or multiple for emitting equipment, require to carry out frequency calibration to meet frequency deviation index, therefore the frequency deviation information of any one carrier wave all can serve as the coarse frequency offset information of other carrier waves in multicarrier in multicarrier.Therefore, the timing information on the second carrier wave that the receiving device obtains can be used as the thick timing information on first carrier.

In one embodiment, the frequency spectrum where first carrier is to exempt from licensed spectrum, and the frequency spectrum where the second carrier wave is licensed spectrum.In another embodiment, the frequency spectrum where frequency spectrum and the second carrier wave where first carrier is equal To exempt from licensed spectrum.

In one embodiment, the first carrier and the second carrier wave are the carrier wave of same base station configuration；In another embodiment, the first carrier and the second carrier wave are the carrier wave that different base stations configures.

Step 304: the receiving device carries out CP at least two symbol on first carrier and handles according to the timing information on the first information and the second carrier wave.

It is handled specifically, carrying out CP by the second length to first symbol at least two symbol on first carrier, CP is carried out by the first length to other symbols at least two symbols in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length.

Based on the above-mentioned technical proposal, the maximum transmitted time delay for the channel multi-path that the receiving device at least can permit when handling the symbol is the second length, i.e. the second length is related with the coverage area of first carrier.When the time difference of the signal for the signal and the second carrier wave from first carrier that the receiving device receives is within the regular hour, the receiving device not will receive the intersymbol interference as caused by the time difference when handling the symbol.Wherein, the time difference is the timing that the timing of the signal of first carrier subtracts the signal of the second carrier wave, and the time range of the time difference is [- (L₁-L₂), L₂], L₁For the first length, L₂For the second length.

During specific implementation step S304, optionally, the first CP is long loop prefix ECP, and first length is the time span of ECP, and second length is the time span of normal cyclic prefix NCP.Specifically, the receiving device determines that the initial time of first symbol in received at least two symbols with the first CP, the receiving device carry out the initial time that CP is handled and obtained second symbol to first symbol according to the initial time and second length of first symbol of the determination using the timing information on the first information and the second carrier wave of acquisition；The receiving device carries out CP to other symbols in addition to first symbol according to the initial time and first length of second symbol of the determination and handles.The maximum transmitted time delay for the channel multi-path that the receiving device at least can permit when handling the symbol is the second length.When the signal and the second carrier wave from first carrier that the receiving device receives signal time difference in [- (L_E-L_N), L_N] in range when, the receiving device not will receive the intersymbol interference as caused by the time difference when handling the symbol.Wherein, L_EIndicate the time span of ECP, L_NIndicate the time span of NCP.

During specific implementation step S304, optionally, the first CP is NCP, and first length is the time span of NCP；Or the first CP is ECP, first length is ECP Time span.Second length is any time length less than first length.Optionally, the second length can be determined by the coverage area of first carrier.For example, the first CP is NCP, first length is the time span of NCP, and second length is the half of the first length.The receiving device determines the initial time of first symbol in received at least two symbols with the first CP using the timing information and the first information of the second carrier wave of acquisition, the receiving device carries out the initial time that CP is handled and obtained second symbol to first symbol according to the initial time of first symbol of the determination and the length of 1/2 NCP, and the receiving device carries out CP to other symbols in addition to first symbol and handle according to the initial time of second symbol of the determination and the length of the NCP.The maximum transmitted time delay for the channel multi-path that the receiving device at least can permit when handling the symbol is 1/2 × L_N.When the signal and the second carrier wave from first carrier that the receiving device receives signal time difference in [- 1/2 × L_N, 1/2 × L_N] in range when, the receiving device not will receive the intersymbol interference as caused by the time difference when handling the symbol.Wherein, L_NIndicate the time span of NCP.

In the specific implementation process, optionally, the method also includes:

Step S305: carrying useful signal in received at least two symbols with the first CP of the receiving device, includes reference signal in the useful signal；The receiving device estimates the Time and Frequency Synchronization information on the first carrier according to the reference signal.

In the specific implementation process, optionally, the useful signal may include reference signal and data-signal.Optionally, reference signal in the useful signal includes following at least one information: public reference signal (Common Reference Signal, CRS), demodulated reference signal (Demodulation Reference Signal, DMRS), channel state information reference signals (Channel State Information-Reference Signal, CSI-RS), reference signal (Discovery Reference Signal, DRS) is found；Optionally, it also include data-signal in the useful signal, data-signal in the useful signal includes following at least one information: Physical Downlink Control Channel (Physical Downlink Control CHannel, PDCCH), Physical Downlink Control Channel (the Enhanced-Physical Downlink Control CHannel enhanced, ePDCCH), Physical Downlink Shared Channel (Physical Downlink Shared CHannel, PDSCH).

During specific implementation step S305, optionally, the Time and Frequency Synchronization information on the first carrier is smart Time and Frequency Synchronization information, for estimating that the reference signal of the Time and Frequency Synchronization information on the first carrier can be CRS, and/or DMRS and/or CSI-RS and/or DRS.

It should be understood that receiving device can estimate frequency deviation in such a way that the reference signal to separated in time matches estimation phase difference when estimating smart Time and Frequency Synchronization information.In conjunction with the system parameter of LAA-LTE system, in order to obtain the smart Frequency Synchronization that can guarantee demodulation performance, for estimating the reference signal interval time length of frequency deviation not less than 3 symbols, preferably, for estimating that the reference signal interval time length of frequency deviation is 4 symbols, i.e. receiving end can use n-th₀A symbol and n-th₀Reference signal joint on+3 symbols carries out offset estimation, n₀For any one notation index.Optionally, in the specific implementation process, the reference signal interval time length for being used to estimate frequency deviation carried in the symbol with the first CP is more than or equal to 4 symbols.

After obtaining the Time and Frequency Synchronization information on first carrier, optionally, the receiving device carries out frequency domain phase compensation to the useful signal according to the Time and Frequency Synchronization information on the first carrier.Optionally, the receiving device carries out frequency domain phase compensation according to symbol of the Time and Frequency Synchronization information on the first carrier to the carrying useful signal for removing CP.By frequency domain phase compensation, the influence that the time-frequency deviation of the signal for the signal and the second carrier wave from first carrier that the receiving device receives demodulates the useful signal can reduce, to guarantee its demodulation performance.

After obtaining the Time and Frequency Synchronization information on first carrier, optionally, the receiving device carries out demodulation process to the symbol received after at least two symbol on first carrier according to the Time and Frequency Synchronization information on the first carrier of the estimation.

With reference to Fig. 4, UE provided by the invention receives the processing schematic of data frame, UE receives OFDM symbol on the carrier wave Pcell of licensed spectrum and the carrier wave Scell for exempting from licensed spectrum respectively, and wherein the symbol on Pcell is the symbol with short CP, and the symbol on Scell is the symbol with long CP.Since the UE reference signal that can be sent by the period on Pcell obtains the Time and Frequency Synchronization on Pcell, UE normally carries out CP by short CP to the OFDM symbol received on Pcell and handles according to the Time and Frequency Synchronization information of acquisition.The timing information in the Time and Frequency Synchronization on Pcell that UE is obtained can be used as the thick timing information on Scell.To OFDM symbol received on Scell, UE determines symbol initial time using the thick timing information on Scell, and first symbol upper to Scell is handled by short CP, is handled by long CP first subsequent symbol of symbol.No matter the signal on Scell is that in advance or delay, can guarantee that the valid data partial information of each OFDM symbol of interception is not interfered between created symbol relative to the signal on Pcell.The signal on Scell that UE tolerable receives subtract the signal on Pcell signal time difference range be [short CP- long CP, Short CP].

With reference to Fig. 5, UE provided by the invention receives the processing schematic of data frame, UE the carrier wave Pcell in licensed spectrum and exempts to receive OFDM symbol on the carrier wave Scell of licensed spectrum respectively, and wherein the symbol on Pcell is the symbol with short CP, and the symbol on Scell is the symbol with long CP.Since the UE reference signal that can be sent by the period on Pcell obtains the Time and Frequency Synchronization on Pcell, UE normally carries out CP by short CP to the OFDM symbol received on Pcell and handles according to the Time and Frequency Synchronization information of acquisition.The timing information in the Time and Frequency Synchronization on Pcell that UE is obtained can be used as the thick timing information on Scell.To OFDM symbol received on Scell, UE determines symbol initial time using the thick timing information on Scell, and first symbol upper to Scell is handled by part CP, is handled by short CP first subsequent symbol of symbol.For example, part CP herein is 1/2 short CP.No matter the signal on Scell is that in advance or delay, can guarantee that the valid data partial information of each OFDM symbol of interception is not interfered between created symbol relative to the signal on Pcell.The signal time difference range that the signal on Scell that UE tolerable receives subtracts the signal on Pcell is [CP -1/2 short, 1/2 short CP].

An application scenarios of the invention are the scene that cooperative multi-point transmission/reception (Coordinated Multiple Point transmission/reception, CoMP) technology uses.With reference to Fig. 6, the system of another embodiment of the invention includes at least two eNB and UE.In non-co-sited (Non co-located) scene of CoMP, UE can be serviced by two eNB simultaneously, i.e. one of service cell eNB sends synchronization signal and Physical Downlink Control Channel (Physical Downlink Control CHannel to UE, PDCCH), another cooperation cell eNB sends Physical Downlink Shared Channel (Physical Downlink Shared Channel to UE, PDSCH), i.e., the functions such as scheduling and resource allocation are all completed by an eNB, data transmission is completed by another eNB, the carrier wave of same frequency can be used in two eNB, also the carrier wave of different frequencies can be used.PDCCH with the PDSCH signal that UE the is received AP different from geographical location.The geographical location as locating for UE between two AP at a distance from it is any, consider the influence of signal transmission delay, PDCCH the and PDSCH symbol that UE is received is poor there are the regular hour, PDSCH symbol reach the receiving end UE may earlier than or be later than PDCCH symbol.

In the prior art, when PDCCH symbol is later than PDSCH symbol, PDSCH symbol is demodulated by the timing of PDCCH symbol, can be interfered between created symbol, possibly can not correctly demodulate the data of PDSCH symbols carry, influence the efficiency of data transmission.

With reference to Fig. 7, another embodiment of data transmission method of the present invention can be applied to the system using CoMP or cross-carrier dispatching technique, and this method includes:

S701:UE receives the data frame that the data frame and the second base station that first base station is sent on first carrier by ECP sub-frame formats are sent on a second carrier simultaneously；

Wherein, the data frame on first carrier carries the EPDCCH/PDSCH symbol of the UE, and the data frame on the second carrier wave carries the PDCCH symbol of the UE；The scheduling information of the EPDCCH/PDSCH is carried in the PDCCH symbol；Include the sub-frame formats information on first carrier in the scheduling information of the EPDCCH/PDSCH；

S702: the timing information on the second carrier wave that the UE is obtained, and the scheduling information of the EPDCCH/PDSCH by being carried in the PDCCH demodulation acquisition PDCCH symbol on the data frame to the second carrier wave；

In one embodiment, the first base station and second base station are different base station, and the first carrier and second carrier wave are the carrier waves of same frequency.In another embodiment, the first base station and second base station are the same base stations, and the first carrier and second carrier wave are the carrier waves of different frequency range.In another embodiment, the first base station and second base station are different base station, and the first carrier and second carrier wave are the carrier waves of different frequency range.

It should be understood that multiple carrier waves can be used for transmitting equipment and receiving device is communicated in LTE/LTE-A communication system.When transmitting equipment is communicated using multiple carrier waves and receiving device, signal transmitting on different carrier waves is that sub-frame boundary is aligned, the signal on different carrier waves that receiving device receives is in time mainly by the influence of signal transmission delay, therefore the timing information of any one carrier wave all can serve as the thick timing information of other carrier waves in multicarrier in multicarrier.In addition, it is required according to RF index, when transmitting equipment is communicated using multiple carrier waves and the same receiving device, no matter it is one or multiple for emitting equipment, require to carry out frequency calibration to meet frequency deviation index, therefore the frequency deviation information of any one carrier wave all can serve as the coarse frequency offset information of other carrier waves in multicarrier in multicarrier.Therefore, the timing information on the second carrier wave that the receiving device obtains can be used as the thick timing information on first carrier.

It should be understood that, in the prior art, when the first carrier and second carrier wave are the carrier waves of the same frequency configured by different base stations, that is when the valid data of the same frequency of the received PDCCH symbol of UE and EPDCCH/PDSCH symbol from different base station transmission, the second base station for sending PDCCH symbol is the serving BS of UE, and the cooperative base station that the first base station for sending EPDCCH/PDSCH symbol is UE (is also claimed Base station is transmitted for data).UE in such a scenario received valid data transmission mode (Transmission mode, TM) be TM10, and the operating mode of UE be qcl-Operation Type B.When UE is configured with TM10 by serving BS, most 4 parameter sets can be configured by high-level signaling simultaneously, include in each parameter set CRS antenna port (crs-PortsCount-r11), CRS frequency offset position (crs-FreqShift-r11), MBSFN sub-frame configures (mbsfn-SubframeConfigList-r11), zero energy CSI-RS configures (csi-RS-ConfigZPId-r11), the initial position PDSCH (pdsch-Start-r11), the parameters such as the non-zero power CSI-RS configuration (qcl-CSI-RS-ConfigNZPId-r11) of quasi- co-sited.It should be recognized that, TM10 can be there are two types of operating mode: qcl-Operation Type A and qcl-Operation Type B, a UE with the transmission of TM10 mode can be configured to one of qcl-Operation Type A and qcl-Operation Type B by higher level parameters.In Type A operating mode, UE assume that antenna port 0-3,7-22 is at delay spread (delay spread), doppler spread (Doppler spread) is consistent in the characteristic of channel such as Doppler frequency shift (Doppler shift), average delay (average delay)；In TypeB operating mode, UE assume that the antenna port 15-22 and antenna port 7-14 of quasi- co-sited (quasi co-located) in delay spread, and doppler spread is consistent in the characteristic of channel such as Doppler frequency shift, average delay.Wherein, antenna port 0-3 is the antenna port of CRS, and antenna port 7-14 is the antenna port of DMRS, and antenna port 15-22 is the antenna port of CSI-RS.If UE is configured for Type B operating mode, UE needs to demodulate serving BS by descending control signaling format (Downlink Control Information format, DCI format) 2 bit PQI (PDSCH RE Mapping and Quasi-Co-Location indicator) the instruction information that includes in the scheduling information of the EPDCCH/PDSCH that carries in the PDCCH that sends of 2D, which of most 4 parameter sets for determining antenna port 7-14 and pre-configuration parameter set is quasi- co-sited, and then determine PDSCH RE rate-matched (RE Mapping) information and Determine the antenna port of DMRS and the quasi- co-sited information of CSI-RS antenna port and CRS antenna port.Therefore, in one embodiment, the PQI instruction information for including in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH of the UE can be used to indicate the sub-frame formats information of the data frame on first carrier simultaneously.When PQI instruction information indicates that the PDCCH information and the EPDCCH/PDSCH information are the valid data that different base stations is transmitted, optionally, the PQI instruction information indicates that the sub-frame formats of the data frame on the first carrier are ECP sub-frame formats simultaneously, and the UE knows the EPDCCH on first carrier by the signaling of the ECP sub-frame formats information obtained and the initial position of the high-rise instruction EPDCCH/PDSCH symbol being pre-configured The initial position of/PDSCH symbol.

It should be understood that, in the prior art, include that carrier wave indicates (Carrier indicator) information in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH of the UE, be used to indicate the first carrier and the second carrier wave whether be same frequency carrier wave.When the first carrier and second carrier wave are the carrier waves of different frequency range, i.e. when the received PDCCH symbol of UE and EPDCCH/PDSCH symbol are from the carrier wave of different frequency range, UE can know the initial position of EPDCCH/PDSCH symbol by the signaling of high-rise configuration.Therefore, in another embodiment, the carrier indication information for including in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH of the UE can be used to indicate the sub-frame formats information of the data frame on first carrier simultaneously.When the carrier indication information indicates the first carrier and the second carrier wave is the carrier wave of different frequencies, optionally, the carrier indication information indicates that the sub-frame formats of the data frame on the first carrier are ECP sub-frame formats simultaneously, and the UE knows the initial position of the EPDCCH/PDSCH symbol on first carrier by the signaling of the ECP sub-frame formats information obtained and the initial position of the high-rise instruction EPDCCH/PDSCH symbol being pre-configured.

In the specific implementation process, optionally, the CRS that the UE can use on the second carrier wave estimates the timing information on second carrier wave.Optionally, the UE can use the CRS on the second carrier wave and demodulate the PDCCH symbol on the second carrier wave and obtain the scheduling information of the EPDCCH/PDSCH carried in the PDCCH symbol.

In the specific implementation process, it should be appreciated that since the data frame on first carrier and the second carrier wave is sent out simultaneously, the timing information on second carrier wave may be considered the thick timing information on first carrier.

S703: the UE, according to the sub-frame formats information on the timing information and the first carrier on second carrier wave, carries out CP to the data frame on first carrier and handles；

Specifically, the UE is according to the timing information on second carrier wave, CP is carried out by the second length to first symbol in the EPDCCH/PDSCH symbol in the data frame on first carrier to handle, it carries out CP by ECP length to other symbols in the EPDCCH/PDSCH symbol in the data frame in addition to first symbol to handle, wherein second length is the random length less than ECP length.

During S703 is embodied, optionally, the sub-frame formats information on the first carrier that the UE passes through acquisition knows that the data frame on first carrier is the sub-frame formats of ECP；The signaling of the initial position for the sub-frame formats information and the high-rise instruction EPDCCH/PDSCH symbol being pre-configured on the first carrier that the UE passes through acquisition knows the EPDCCH/PDSCH on first carrier The initial position of symbol.The UE is according to the timing information on second carrier wave, CP is carried out by the second length to first symbol in the EPDCCH/PDSCH symbol on first carrier to handle, it carries out CP by ECP length to other symbols in the EPDCCH/PDSCH symbol in addition to first symbol to handle, wherein second length is the random length less than ECP length.Optionally, second length can be the length of NCP, it can guarantee UE when carrying out significant character interception to the symbol on the data frame on first carrier in this way, when the signal time difference range of the UE first carrier received and the second carrier wave is [NCP-ECP, NCP] when, it is not interfered between created symbol.

In another embodiment, the data transmission method further include:

S704: the UE estimates the Time and Frequency Synchronization information on the first carrier according to the reference signal in the EPDCCH/PDSCH symbol on the first carrier；The Time and Frequency Synchronization information on the first carrier that the UE is obtained according to estimation carries out frequency domain phase compensation to the EPDCCH/PDSCH symbol.

During S704 is embodied, optionally, the UE estimates the Time and Frequency Synchronization information of the first carrier according to the pilot signal carried in the EPDCCH/PDSCH symbol on the first carrier.For estimating that the pilot signal of the Time and Frequency Synchronization information of the first carrier can be the CRS on first carrier and/or CSI-RS and/or DMRS.It is further alternative, the frequency deviation of first carrier can be estimated with the CRS on first carrier, and the timing of first carrier can be estimated with the CSI-RS on first carrier.Time and Frequency Synchronization information on the first carrier can be used for carrying out frequency domain phase compensation to the EPDCCH/PDSCH symbol.Optionally, the Time and Frequency Synchronization information on the first carrier can be used for carrying out demodulation process to the symbol on subsequently received first carrier.

With reference to Fig. 8, UE provided by the invention receives the processing schematic of data frame, UE receives OFDM symbol on the carrier wave of the carrier wave of serving cell and cooperation cell respectively, and wherein the symbol on serving cell is the symbol with short CP, and the symbol on cooperation cell is the symbol with long CP.Since the UE reference signal that can be sent by the period on serving cell obtains the Time and Frequency Synchronization on serving cell, UE normally carries out CP by short CP to the OFDM symbol received on serving cell and handles according to the Time and Frequency Synchronization information of acquisition.The timing information in the Time and Frequency Synchronization on serving cell that UE is obtained can be used as the thick timing information on cooperation cell.To OFDM symbol received on cooperation cell, UE determines symbol initial time using the thick timing information on cooperation cell, is handled by short CP first symbol on cooperation cell, is handled by long CP first subsequent symbol of symbol.No matter the signal on cooperation cell is relative to the letter on serving cell It number is that can guarantee that the valid data partial information of each OFDM symbol of interception is not interfered between created symbol in advance or delay.The time difference range that the signal on cooperation cell that UE tolerable receives subtracts the signal on serving cell is [short CP- long CP, short CP].

Corresponding to the above method, the embodiment of the invention provides a kind of terminals.With reference to Fig. 9, which includes:

Receiver 901, for receiving at least two symbols with first circulation prefix CP on first carrier；Wherein, the time span of the first CP is the first length；

Processing unit 902, for obtaining the thick timing information on the first information and first carrier, according to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length, and the first information includes the first length information.

In one embodiment, the first length is the time span of long loop prefix ECP, and second length is the time span of normal cyclic prefix NCP.

In another embodiment, second length is the half of first length；First length is the time span of NCP；Or first length is the time span of ECP.

In one embodiment, processing unit is specifically used for: according to the predefined information acquisition first information.In another embodiment, processing unit is specifically used for: the signaling instruction for receiving the first information obtains the first information.

In one embodiment, the first information further includes the symbol numbers with the first CP, and/or, the number of sub-frames with the first CP, and/or, the initial position of the symbol with the first CP.

In another embodiment, processing unit 902 is specifically used for:

The timing information on the second carrier wave is obtained, the thick timing information as first carrier；Wherein, the first carrier and second carrier wave are the carrier wave of same base station configuration；Alternatively, the first carrier and second carrier wave are the carrier wave that different base stations configures.

Specifically, the frequency spectrum where first carrier is to exempt from licensed spectrum, the frequency spectrum where second carrier wave is licensed spectrum；Alternatively, the frequency spectrum where frequency spectrum and second carrier wave where the first carrier is to exempt from licensed spectrum；Alternatively, the frequency spectrum where frequency spectrum and second carrier wave where the first carrier is the licensed spectrum with frequency.

In one embodiment, the data frame on first carrier carries EPDCCH/PDSCH information, described Data frame on second carrier wave carries PDCCH information；The first carrier and the second carrier wave are the carrier wave that different base stations configures；The processing unit 902, information is indicated specifically for the PQI for including in the scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, the first information is obtained, wherein PQI instruction information is used to indicate the sub-frame formats information of the data frame on first carrier.

In another embodiment, the data frame on first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；The processing unit 902, specifically for the carrier indication information for including in the scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, obtain the first information, wherein the carrier indication information is used to indicate the sub-frame formats information of the data frame on first carrier.

In another embodiment, useful signal is carried in received at least two symbols with the first CP, includes reference signal in the useful signal, the processing unit is also used to, and the Time and Frequency Synchronization information on the first carrier is estimated according to the reference signal.

In another embodiment, the processing unit is also used to: carrying out frequency domain phase compensation to the useful signal according to the Time and Frequency Synchronization information on the first carrier of the estimation；Alternatively, carrying out demodulation process to the symbol received after at least two symbol according to the Time and Frequency Synchronization information on the first carrier of the estimation.

Specifically, the reference signal in the useful signal includes following at least one information:

Public reference signal, demodulated reference signal, channel state information reference signals find reference signal.Also include data-signal in the useful signal, the data-signal in the useful signal includes following at least one information:

Physical Downlink Control Channel, the Physical Downlink Control Channel of enhancing, Physical Downlink Shared Channel.

Certainly, in different situations, different units can be divided into processing unit.In one embodiment, processing unit includes:

Information obtainment unit, for obtaining the thick timing information on the first information and first carrier；

Remove CP processing unit, according to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length.

Wherein, information obtainment unit is specifically used for, according to the predefined information acquisition first information；Or, the signaling instruction for receiving the first information obtains the first information.

In another embodiment, information obtainment unit is specifically used for: obtaining the timing information on the second carrier wave, the thick timing information as first carrier；Wherein, the first carrier and second carrier wave are the carrier wave of same base station configuration；Alternatively, the first carrier and second carrier wave are the carrier wave that different base stations configures.

With reference to Figure 10, another embodiment of terminal 1000 provided by the invention, comprising: receiver 1010, modem 1020, at least one processor 1040, memory 1050, at least one communication bus.Memory 1050 may include read-only memory and random access memory, and provide instruction and data to processor 1040.Such as: random access memory, flash memory, read-only memory, programmable read only memory, nonvolatile memory, nonvolatile RAM (NVRAM) or register etc..Processor 1040 can be central processing unit (Central Processing Unit, CPU).By the program or instruction for calling memory 1050 to store, processor 1040 executes various functions.

The mobile terminal 1000 optionally includes user interface 1030, including display (such as, touch screen, LCD, CRT, holographic imaging (Holographic) or projection (Projector) etc.), keyboard or pointing device (such as, mouse, trace ball (trackball), touch-sensitive plate or touch screen etc.).

Wherein, receiver 1010, for receiving at least two symbols with first circulation prefix CP on first carrier；Wherein, the time span of the first CP is the first length.

For example, receiver can be the antenna of mobile terminal.

Modem 1020, for obtaining the thick timing information on the first information and first carrier, according to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length, and the first information includes the first length information.

With reference to Figure 11, another embodiment of data transmission method provided by the invention, comprising:

S1101: sending device sends at least one symbol with long loop prefix ECP since at the time of obtaining the channel access right on the first carrier for exempting from licensed spectrum to receiving device；

S1102: the sending device notifies the second information to the receiving device；Second information includes the CP format of at least one symbol.

In one embodiment, sending device notifies the receiving device by way of predefined or signal Second information.

During another is implemented, the second information further include:

Symbol numbers with ECP, and/or, the number of sub-frames with ECP, and/or, the initial position of the symbol with ECP.

With reference to Figure 12, a kind of embodiment of sending device provided by the invention, comprising:

Transmitter 1201, for sending at least one symbol with long loop prefix ECP to receiving device since at the time of obtaining the channel access right on the first carrier for exempting from licensed spectrum；

Notification unit 1202, for notifying the second information to the receiving device；Second information includes the CP format of at least one symbol.

In one embodiment, notification unit 1202 notifies the second information described in the receiving device by way of predefined or signal.

In another embodiment, the second information further include:

Symbol numbers with ECP, and/or, the number of sub-frames with ECP, and/or, the initial position of the symbol with ECP.

Optionally, which can be base station.

Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, it is that relevant hardware can be instructed to complete by computer program, the program can be stored in a computer-readable storage medium, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic disk, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..

In several embodiments provided herein, it should be understood that disclosed systems, devices and methods may be implemented in other ways.Such as, the apparatus embodiments described above are merely exemplary, such as, the division of the unit, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed mutual coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit, It can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, and component shown as a unit may or may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.

In addition, the functional units in various embodiments of the present invention may be integrated into one processing unit, it is also possible to each unit and physically exists alone, can also be integrated in one unit with two or more units.

In short, the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not intended to limit the scope of the present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.

Claims (30)

1. A kind of data transmission method characterized by comprising

   At least two symbols with first circulation prefix CP are received on first carrier；Wherein, the time span of the first CP is the first length；

   The first information is obtained, the first information includes the first length information；

   Obtain the thick timing information on first carrier；

   According to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length.
2. The method according to claim 1, wherein first length is the time span of long loop prefix ECP, second length is the time span of normal cyclic prefix NCP.
3. The method according to claim 1, wherein second length is the half of first length.
4. Either method according to claim 1 to 3, which is characterized in that obtaining the first information includes:

   The first information is predefined information；Or

   The signaling instruction for receiving the first information obtains the first information.
5. Method either described in -4 according to claim 1, which is characterized in that the first information further includes the symbol numbers with the first CP, and/or, the number of sub-frames with the first CP, and/or, the initial position of the symbol with the first CP.
6. Method either described in -5 according to claim 1, which is characterized in that obtain the thick timing information on first carrier, comprising:

   The timing information on the second carrier wave is obtained, the thick timing information as first carrier；Wherein, the first carrier and second carrier wave are the carrier wave of same base station configuration；Alternatively, the first carrier and second carrier wave are the carrier wave that different base stations configures.
7. According to the method described in claim 6, the frequency spectrum where second carrier wave is licensed spectrum it is characterized in that, the frequency spectrum where the first carrier is to exempt from licensed spectrum；Or

   The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is to exempt from licensed spectrum；Or

   The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is the licensed spectrum with frequency.
8. The method either according to claim 6-7, which is characterized in that the data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；The first carrier and the second carrier wave are the carrier wave that different base stations configures, and the acquisition first information includes:

   Information is indicated according to the PQI for including in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH, obtains the first information, wherein PQI instruction information is used to indicate the sub-frame formats information of the data frame on first carrier.
9. The method either according to claim 6-7, which is characterized in that the data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；The acquisition first information includes:

   According to the carrier indication information for including in the scheduling information of the EPDCCH/PDSCH carried in the PDCCH, the first information is obtained, wherein the carrier indication information is used to indicate the sub-frame formats information of the data frame on first carrier.
10. Method either described in -9 according to claim 1, which is characterized in that useful signal is carried in received at least two symbols with the first CP, includes reference signal in the useful signal, the method also includes:

    The Time and Frequency Synchronization information on the first carrier is estimated according to the reference signal.
11. According to the method described in claim 10, it is characterized in that, the method also includes:

    Frequency domain phase compensation is carried out to the useful signal according to the Time and Frequency Synchronization information on the first carrier of the estimation；Or

    Demodulation process is carried out to the symbol received after at least two symbol according to the Time and Frequency Synchronization information on the first carrier of the estimation.
12. Method either described in -11 according to claim 1, which is characterized in that the reference signal in the useful signal includes following at least one information:

    Public reference signal, demodulated reference signal, channel state information reference signals find reference signal；

    Also include data-signal in the useful signal, the data-signal in the useful signal includes following at least one information:

    Physical Downlink Control Channel, the Physical Downlink Control Channel of enhancing, Physical Downlink Shared Channel.
13. A kind of terminal characterized by comprising

    Receiver, for receiving at least two symbols with first circulation prefix CP on first carrier, and；Wherein, the time span of the first CP is the first length；

    Processing unit, for obtaining the thick timing information on the first information and first carrier, according to the thick timing information and the first information on the first carrier, CP is carried out by the second length to first symbol at least two symbol on first carrier to handle, and CP is carried out by the first length to other symbols at least two symbol in addition to first symbol and is handled；Wherein the second length is the arbitrary value less than the first length；The first information includes the first length information.
14. Terminal according to claim 13, which is characterized in that the first length is the time span of long loop prefix ECP, and second length is the time span of normal cyclic prefix NCP.
15. Terminal according to claim 13, which is characterized in that second length is the half of first length.
16. Any terminal described in 3-15 according to claim 1, which is characterized in that the processing unit is specifically used for: according to the predefined information acquisition first information；Or

    The processing unit is specifically used for: the signaling instruction for receiving the first information obtains the first information.
17. Any terminal described in 3-16 according to claim 1, which is characterized in that the first information further includes the symbol numbers with the first CP, and/or, the number of sub-frames with the first CP, and/or, the initial position of the symbol with the first CP.
18. Any terminal described in 3-17 according to claim 1, which is characterized in that the processing unit is specifically used for:

    The timing information on the second carrier wave is obtained, the thick timing information as first carrier；Wherein, the first carrier and second carrier wave are the carrier wave of same base station configuration；Alternatively, the first carrier and second carrier wave are the carrier wave that different base stations configures.
19. Terminal according to claim 18, which is characterized in that the frequency spectrum where the first carrier is to exempt from licensed spectrum, and the frequency spectrum where second carrier wave is licensed spectrum；Or

    The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is to exempt from licensed spectrum；Or

    The frequency spectrum where frequency spectrum and second carrier wave where the first carrier is the licensed spectrum with frequency.
20. Terminal described in 8 or 19 according to claim 1, which is characterized in that the data frame on the first carrier carries EPDCCH/PDSCH information, the data frame carrying PDCCH letter on second carrier wave Breath；The first carrier and the second carrier wave are the carrier wave that different base stations configures；

    The processing unit, information is indicated specifically for the PQI for including in the scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, the first information is obtained, wherein PQI instruction information is used to indicate the sub-frame formats information of the data frame on first carrier.
21. Terminal described in 8 or 19 according to claim 1, which is characterized in that the data frame on the first carrier carries EPDCCH/PDSCH information, and the data frame on second carrier wave carries PDCCH information；

    The processing unit, specifically for the carrier indication information for including in the scheduling information according to the EPDCCH/PDSCH carried in the PDCCH, obtain the first information, wherein the carrier indication information is used to indicate the sub-frame formats information of the data frame on first carrier.
22. Terminal described in 3-21 according to claim 1, it is characterized in that, useful signal is carried in received at least two symbols with the first CP, it include reference signal in the useful signal, the processing unit is also used to, and the Time and Frequency Synchronization information on the first carrier is estimated according to the reference signal.
23. Terminal according to claim 22, which is characterized in that the processing unit is also used to: frequency domain phase compensation is carried out to the useful signal according to the Time and Frequency Synchronization information on the first carrier of the estimation；Or

    Demodulation process is carried out to the symbol received after at least two symbol according to the Time and Frequency Synchronization information on the first carrier of the estimation.
24. Terminal described in 3-23 according to claim 1, which is characterized in that the reference signal in the useful signal includes following at least one information:

    Public reference signal, demodulated reference signal, channel state information reference signals find reference signal；

    Also include data-signal in the useful signal, the data-signal in the useful signal includes following at least one information:

    Physical Downlink Control Channel, the Physical Downlink Control Channel of enhancing, Physical Downlink Shared Channel.
25. A kind of data transmission method characterized by comprising

    Sending device sends at least one symbol with long loop prefix ECP since at the time of obtaining the channel access right on the first carrier for exempting from licensed spectrum to receiving device；

    The sending device notifies the second information to the receiving device；Second information includes the CP format of at least one symbol.
26. According to the method for claim 25, which is characterized in that the sending device passes through predetermined Justice or the mode signaled notify the second information described in the receiving device.
27. The method according to claim 25 or 26, which is characterized in that second information further include:

    Symbol numbers with ECP, and/or, the number of sub-frames with ECP, and/or, the initial position of the symbol with ECP.
28. A kind of sending device characterized by comprising

    Transmitter, for sending at least one symbol with long loop prefix ECP to receiving device since at the time of obtaining the channel access right on the first carrier for exempting from licensed spectrum；

    Notification unit, for notifying the second information to the receiving device；Second information includes the CP format of at least one symbol.
29. Sending device according to claim 28, which is characterized in that the notification unit notifies the second information described in the receiving device by way of predefined or signal.
30. The sending device according to claim 28 or 29, which is characterized in that second information further include:

    Symbol numbers with ECP, and/or, the number of sub-frames with ECP, and/or, the initial position of the symbol with ECP.