CN113169835B

CN113169835B - Data transmission method and device

Info

Publication number: CN113169835B
Application number: CN201880100086.1A
Authority: CN
Inventors: 贾树葱; 任占阳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2023-11-03
Anticipated expiration: 2038-12-14
Also published as: WO2020118720A1; CN113169835A

Abstract

A data transmission method and device, wherein the method comprises the following steps: in a first fixed frame period FFP, the terminal equipment receives first control information from the network equipment; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is located after the first FFP; and when the terminal equipment receives second control information sent by the network equipment in the second FFP, uplink data transmission is performed in the second FFP according to the first control information.

Description

Data transmission method and device

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a data transmission method and apparatus.

Background

Multewire is a new technology in the field of wireless communication, and long term evolution (long term evolution, LTE) can be applied to unlicensed spectrum to provide high-performance communication services. Future multewire may also be based on New Radio (NR) technology, which is applied to unlicensed spectrum. There are different regulations for unlicensed spectrum use in different countries, for example in the european market, where base stations have to use unlicensed spectrum by listen before talk (listen before talk, LBT). For a specific LBT mechanism, the procedure corresponding to the frame-based device (frame based equipment, FBE) and the load-based device (load based equipment, LBE) is different. For FBE, the LBT procedure is as follows: before transmission, the base station needs to perform clear channel assessment (clear channel assessment, CCA) that signals are transmitted immediately if the channel is not occupied, otherwise, signals including data, control information, reference signals, etc. cannot be transmitted until the next fixed frame period (fixed frame period, FFP). The FFP consists of a channel occupancy time (channel occupancy time, COT) and an idle period (idle period), wherein the COT takes a value between 1ms and 10ms, the minimum idle period is 5% of the channel occupancy time, and at the end of the idle period, the base station performs a new CCA detection. After LBT success, the base station may send downlink control information (downlink control information, DCI) in the unlicensed spectrum, where a portion of the DCI may be used to schedule the terminal device for uplink data transmission.

The terminal device may monitor signals transmitted by the base station in the unlicensed spectrum, such as cell-specific reference signals (cell-specific Reference signal, CRS) transmitted by the base station, so as to determine whether the LBT of the base station is successful and transmit downlink signals. If the terminal equipment determines that the base station LBT is successful and transmits the downlink signal, the signal transmitted by the base station may be received in the unlicensed spectrum. If the terminal equipment receives DCI (downlink control information) sent by the base station and used for scheduling the terminal equipment to perform uplink data transmission, during the period that the base station occupies the unlicensed spectrum, if the maximum channel occupation time (maximum channel occupancy time, MCOT) of the base station is not used up, the terminal equipment can send uplink data within 16 microseconds after the base station sends downlink signals, according to the scheduling of the DCI, and at the moment, the terminal equipment does not need to perform LBT.

The terminal equipment monitors signals sent by the base station in the unlicensed spectrum to determine whether the base station is successful in LBT and send downlink signals, and possibly has the conditions of false alarm and missed detection. Wherein 'false alarm' means that the base station does not have LBT success or does not transmit downlink signals for other reasons, but the UE considers that the base station LBT is successful and transmits downlink signals after detecting; 'missed' refers to the base station LBT being successful and transmitting a downlink signal, but the UE considers that the base station has not been LBT successful after detection or has not transmitted a downlink signal for other reasons. Because the time of the FFP is very short, the time-frequency resource of the DCI transmitted by the base station and the time-frequency resource of the uplink data transmission scheduled by the DCI may not be in the same FFP, in this case, if the terminal device performs false alarm or missed detection, the terminal device may collide with the uplink data transmitted by other devices according to the uplink data transmitted by the DCI, which results in mutual interference. And because the terminal device does not perform LBT, but performs uplink data transmission within 16 microseconds after the base station downlink signal is mistakenly considered to be sent by the terminal device, the uplink data transmission of the terminal device during false alarm violates the unlicensed spectrum regulation of the FBE.

For this reason, how to improve the efficiency of data transmission in unlicensed spectrum and compliance with regulations is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a data transmission method and a data transmission device, which are used for improving the efficiency of data transmission in unlicensed spectrum.

In a first aspect, an embodiment of the present application provides a data transmission method, including: in a first fixed frame period FFP, the terminal equipment receives first control information from the network equipment; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0; and when the terminal equipment receives second control information sent by the network equipment in the second FFP, uplink data transmission is performed in the second FFP according to the first control information.

By the method, when the first control information sent by the network device and the uplink subframe of the terminal device scheduled by the first control information for uplink data transmission are not in the same FFP, the terminal device can determine whether to perform uplink data transmission according to the first control information by judging whether the network device sends the second control information in the second FFP. When the terminal equipment receives the second control information, the uplink data transmission of the terminal equipment according to the first control information can not collide with the data transmission of other equipment, so that the efficiency of data transmission in the unlicensed spectrum is improved.

In an alternative embodiment, the method further comprises: and when the terminal equipment judges that the network equipment does not send the second control information in the second FFP, the first control information is ignored.

By the method, even if the terminal equipment fails to receive the second control information in the second FFP, the terminal equipment directly ignores the first control information after the failure to detect, so that the first control information is not delayed to the subsequent FFP, and therefore, the terminal equipment cannot collide with uplink data transmission of other terminal equipment.

In an alternative embodiment, the terminal device receives the second control information sent by the network device in the second FFP, including: in the second FFP, the terminal device sends a candidate location of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH in the network device, and verifies a cyclic redundancy check (cyclic redundancy check, CRC) of data information carried in the candidate location according to at least one preset radio network temporary identifier (radio network tempory identity, RNTI), where the at least one radio network temporary identifier RNTI may be a cell radio network temporary identifier (cell RNTI, C-RNTI), a system information radio network temporary identifier (system information RNTI, SI-RNTI), a paging radio network temporary identifier (paging RNTI, P-RNTI), a random access radio network temporary identifier (random access RNTI, RA-RNTI), a temporary cell radio network temporary identifier (temporary cell RNTI, TC-RNTI), a semi-persistent scheduling cell radio network temporary identifier (semi persistence scheduling cell, SPS-C-RNTI), a physical uplink control channel transmission power control radio network temporary identifier (transmit power control-physical uplink control channel-RNTI, PUCCH-RNTI), a physical uplink control channel transmission power control radio network temporary identifier (transmit power control-TPC-83-radio network RNTI), or a plurality of radio network RNTIs broadcast by a plurality of TPC-3-to one or multiple radio network RNTIs broadcasted by a plurality of TPC-3-radio network RNTIs broadcasted by a user equipment; when the CRC verification is successful, the terminal equipment receives the second control information carried in the data information; and when the CRC verification of the candidate positions of all PDCCHs or EPDCCHs by the terminal equipment by using all preset RNTI is unsuccessful, the terminal equipment judges that the network equipment does not send the second control information in the second FFP.

By the method, the terminal equipment checks whether the network equipment transmits the second control information in the second FFP through the CRC, and the probability of false alarm is very small at the moment, so that the probability of collision with data transmission of other equipment when the terminal equipment performs uplink data transmission is reduced, and the efficiency of data transmission in an unlicensed spectrum is improved.

In an alternative embodiment, the second control information is used to schedule the terminal device to perform uplink data transmission; or, the second control information is used for scheduling the terminal equipment to receive downlink data; or, the second control information is used for indicating the terminal equipment to adjust uplink transmission power; or the second control information is used for indicating the terminal equipment to receive system broadcast information; or, the second control information is used for indicating the terminal equipment to receive paging information; or, the CRC of the second control information is scrambled by a C-RNTI (Cell RNTI, cell radio network temporary identifier); or, the CRC of the second control information is scrambled through SI-RNTI; or, the CRC of the second control information is scrambled through the P-RNTI; alternatively, the CRC of the second control information is scrambled by RA-RNTI; alternatively, the CRC of the second control information is scrambled through TC-RNTI; or, the CRC of the second control information is scrambled through SPS-C-RNTI; or, the CRC of the second control information is scrambled through TPC-PUCCH-RNTI; or, the CRC of the second control information is scrambled through TPC-PUSCH-RNTI; alternatively, the CRC of the second control information is scrambled by the M-RNTI.

In a second aspect, an embodiment of the present application provides a data transmission method, including: the network equipment sends first control information to the terminal equipment in a first frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0; the network device sends second control information to the terminal device in the second FFP.

In an alternative embodiment, the second control information is used to schedule the terminal device to perform uplink data transmission; or the second control information is used for scheduling the terminal equipment to receive downlink data; or, the second control information is used for indicating the terminal equipment to adjust uplink transmission power; or the second control information is used for indicating the terminal equipment to receive system broadcast information; or, the second control information is used for indicating the terminal equipment to receive paging information; or, the CRC of the second control information is scrambled through the C-RNTI; or, the CRC of the second control information is scrambled through SI-RNTI; or, the CRC of the second control information is scrambled through the P-RNTI; alternatively, the CRC of the second control information is scrambled by RA-RNTI; alternatively, the CRC of the second control information is scrambled through TC-RNTI; or, the CRC of the second control information is scrambled through SPS-C-RNTI; or, the CRC of the second control information is scrambled through TPC-PUCCH-RNTI; or, the CRC of the second control information is scrambled through TPC-PUSCH-RNTI; alternatively, the CRC of the second control information is scrambled by the M-RNTI.

In a third aspect, an embodiment of the present application provides a data transmission method, including: the network equipment determines that the unlicensed spectrum is occupied in a fourth fixed frame period FFP; the network device sends fourth control information to the terminal device through the unlicensed spectrum in the fourth FFP; the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and an interval M FFPs with the fourth FFP is an integer greater than or equal to 0.

By the method, when the uplink sub-frame of the uplink data transmission of the terminal equipment scheduled by the third control information and the third control information sent by the network equipment are not in the same FFP, the third control information cannot be independently effective, and the FFP in which the third control information is effective must be indicated by the fourth control information, so that the terminal equipment is in the FFP of the unlicensed spectrum occupied by the network equipment when the uplink data transmission is carried out according to the third control information, the uplink data of the terminal equipment cannot collide with the uplink data of other terminal equipment, and the efficiency of data transmission in the unlicensed spectrum is improved.

In an alternative embodiment, the network device determines that the unlicensed spectrum is occupied within the fourth FFP, and the method further comprises: the network equipment sends the third control information to terminal equipment in the third FFP; and the third control information is used for scheduling the terminal equipment to carry out uplink data transmission.

In an alternative embodiment, the fourth control information includes a first information field, where the first information field includes K bits; and when the K bit values in the first information domain are first preset values, the K bit values are used for indicating the network equipment to occupy the unlicensed spectrum in the fourth FFP, and K is an integer greater than or equal to 0.

In an alternative embodiment, the fourth control information includes a second information field, where the second information field includes L bits; and when the L bit values in the second information domain are second preset values, the L bit values are used for indicating the terminal equipment to perform uplink data transmission in the fourth FFP according to the third control information, and L is an integer greater than 0.

In a fourth aspect, an embodiment of the present application provides a data transmission method, including: the terminal equipment receives third control information from the network equipment through the unlicensed spectrum in a third fixed frame period FFP; the third control information is used for scheduling the terminal equipment to perform uplink data transmission; when the terminal equipment is in a fourth FFP, fourth control information from the network equipment is received through the unlicensed spectrum, and uplink data transmission is performed in the fourth FFP according to the third control information; the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and is spaced from the fourth FFP by M FFPs, and M is an integer greater than or equal to 0.

In an alternative embodiment, the terminal device receives fourth control information from the network device through the unlicensed spectrum in a fourth fixed frame period FFP, including: in the fourth FFP, the terminal device sends a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH in the network device, and verifies a cyclic redundancy check (cyclic redundancy check, CRC) of data information carried in the candidate position according to at least one preset radio network temporary identifier (radio network tempory identity, RNTI); and when the CRC verification is successful by the terminal equipment, and the K bit values obtained from the preset positions of the data information carried in the candidate positions are first preset values, judging that the fourth control information is included in the data information carried in the candidate positions, wherein the preset positions are positions of a first information field in the fourth control information.

In a fifth aspect, an embodiment of the present application provides a terminal device, including a memory, a transceiver, and a processor, where: the memory is used for storing instructions; the processor is configured to control the transceiver to receive and transmit signals according to executing the instructions stored in the memory, and when the processor executes the instructions stored in the memory, is configured to perform the method in any one of the possible designs of the first or the first aspect, or to perform the method in any one of the possible designs of the fourth or the fourth aspect.

In a sixth aspect, an embodiment of the present application provides a terminal device, configured to implement the first aspect, or the fourth aspect, or any method of the first aspect, or any method of the fourth aspect, including a corresponding functional module, for example, including a processing unit, a receiving unit, a sending unit, and so on, where each is configured to implement a step in the foregoing method.

In a seventh aspect, an embodiment of the present application provides a network device, including a memory, a communication interface, and a processor, wherein: the memory is used for storing instructions; the processor is configured to perform the method according to the second aspect or any of the possible designs of the second aspect or the method according to the third aspect or any of the possible designs of the third aspect when the processor executes the instructions stored in the memory, and to control the communication interface to perform signal reception and signal transmission.

In an eighth aspect, an embodiment of the present application provides a network device, configured to perform the method in the second aspect or any one of the possible designs of the second aspect, or perform the method in the third aspect or any one of the possible designs of the third aspect, where the network device includes a corresponding functional module, for example, including a processing unit, a receiving unit, a sending unit, and so on, and are respectively configured to implement steps in the above method.

An embodiment of the present application provides a data transmission device, including: a memory for storing instructions and a processor for executing the instructions stored in the memory, and execution of the instructions stored in the memory causes the processor to perform the method of any one of the possible designs described above.

Embodiments of the present application provide a computer readable storage medium having stored therein computer readable instructions which, when read and executed by a data transmission device, cause the data transmission device to perform a method in any of the above possible designs.

Embodiments of the present application provide a computer program product comprising computer readable instructions which, when read and executed by a data transmission device, cause the data transmission device to perform a method as in any of the possible designs described above.

The embodiment of the application provides a chip which is connected with a memory and is used for reading and executing a software program stored in the memory so as to realize the method in any one of the possible designs.

Drawings

Fig. 1 is a schematic diagram of a radio frame structure according to an embodiment of the present application;

fig. 2 is a schematic diagram of a radio frame structure according to an embodiment of the present application;

FIG. 3 is a schematic diagram of data scheduling according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a data transmission method according to an embodiment of the present application;

fig. 5 is a schematic diagram of data scheduling according to an embodiment of the present application;

FIG. 6 is a schematic diagram of data scheduling according to an embodiment of the present application;

fig. 7 is a schematic flow chart of a data transmission method according to an embodiment of the present application;

FIG. 8 is a schematic diagram of data scheduling according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Embodiments of the present application may be applied to multewire or other wireless communication systems using unlicensed spectrum, including but not limited to: new Radio (NR) systems, global system for mobile communications (global system of mobile communication, GSM) systems, code division multiple access (code division multiple access, CDMA) systems, wideband code division multiple access (wideband code division multiple access, WCDMA) systems, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) systems (including Time Division (TD) -LTE and frequency division (frequency division, FD) -LTE), long term evolution-advanced (advanced long term evolution, LTE-a) systems, universal mobile telecommunications systems (universal mobile telecommunication system, UMTS), evolved long term evolution (evolved long term evolution, LTE) systems, future communications systems, and the like, without limitation herein.

In the embodiment of the present application, the terminal device may be a device having a wireless transceiver function or a chip that may be disposed in any device, and may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like.

The network device may be an evolved base station (evolutional node B, eNB) in the LTE system, may be a base station (base transceiver station, BTS) in the global system for mobile communications (global system of mobile communication, GSM) system or code division multiple access (code division multiple access, CDMA), may be a base station (nodeB, NB) in the wideband code division multiple access (wideband code division multiple access, WCDMA) system, or the like.

In order to improve spectrum utilization, an LTE system, an NR system, etc. may be applied to unlicensed spectrum through a multewire technology, thereby meeting the increasing demands of mobile broadband services. Taking the TD-LTE system as an example, in the TD-LTE system, due to the need of Uplink and downlink time conversion, an Uplink-downlink configuration (Uplink-downlink configuration) structure as shown in table 1 is designed for each radio frame. The radio frame uses two Downlink-to-Uplink Switch point periods (Downlink-to-Uplink Switch-point periodicity), 5ms and 10ms. One radio frame is 10ms long and consists of two 5ms long half frames, each consisting of 5 1ms long subframes. The entire frame can also be understood as being divided into 10 subframes of length 1ms as a unit of data scheduling and transmission. The subframes #1 and #6 may be configured as special subframes, where the subframes include 3 special slots, and the specific contents of the special slots are not described herein.

TABLE 1

In table 1, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe. For convenience of description, the manner of representing the sub-frames is used in the following description, and will not be described one by one.

In the embodiment of the present application, in order to implement the uplink-downlink configuration of the FBE mode LBT, the uplink-downlink configuration with a downlink-to-uplink switching point period of 5ms in table 1 may be modified, the corresponding FFP is 5ms, and configurations 0 to 2 may be shown in fig. 1. Accordingly, the uplink-downlink configuration of the FBE mode LBT can be implemented with modifications to the uplink-downlink configuration of table 1 with a downlink-to-uplink switching point period of 10ms, and configurations 3 to 5 are specifically shown with reference to fig. 2. In fig. 1 and 2, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe. It should be noted that, since the idle period in one FFP needs to be not less than 5% of the FFP, if the FFP is 5ms, taking DSUUU of configuration 0 as shown in fig. 1 as an example, the total time of 5 subframes of DSUUU needs to be less than 4.75 ms, which can be achieved by reducing the number of symbols in S subframes.

Of course, the above is merely an example, and other configurations of the downlink time-frequency resources and the uplink time-frequency resources within the FFP may exist, which are not illustrated one by one.

Currently, when the terminal device receives DCI carried by the network device on a physical downlink control channel (physical downlink control channel, PDCCH) or an enhanced physical downlink control channel (enhanced physical downlink control channel, EPDCCH), the terminal device can send uplink data according to the indication of the DCI. Considering that the DCI wireless signal transmission takes some time, the terminal device needs to take some time to receive and correctly decode the indication in the DCI, and the terminal device needs to take some time to encode the data packet according to the indication, so that the subframe where the terminal device uplink data transmission is located needs to be after the downlink subframe carrying the DCI, for example, in the case of the TD-LTE system, generally if the DCI is sent to the terminal device by the network device in the nth subframe, the terminal device should transmit data to the network device in the n+kth subframe, k is generally greater than or equal to 4, and the n+kth subframe needs to be the uplink subframe. Thus, the multewire technology may have some problems if it is fully in accordance with the uplink data transmission mode of the TD-LTE system.

For example, in unlicensed spectrum, a network device performs LBT when FFP is on. If LBT is successful, the downlink signal and the uplink signal can be sent in FFP; if the LBT fails, the downstream and upstream signals cannot be transmitted within the FFP. When the FFP length is 5 ms. Since the uplink data transmission of the terminal device needs to be sent in n+k subframes, k is generally equal to or greater than 4, and n+k needs to be an uplink subframe, there is a possibility that the subframe carrying DCI indicated by uplink scheduling and the uplink subframe indicated by DCI for transmitting uplink data are not in the same FFP. At this time, if the terminal equipment completely follows the operation flow of the TD-LTE, the terminal equipment collides with the existing unlicensed spectrum regulations, namely the regulations risk occurs. Reference may be made in particular to fig. 3. In fig. 3, the network device may carry PDCCH or EPDCCH in downlink symbols of the D and S subframes. First case: the DCI of the S subframe PDCCH or EPDCCH of the first FFP may instruct the terminal device to transmit uplink data in the first U uplink subframe of the second FFP, and when the network device succeeds in LBT before the second FFP, the terminal device may transmit uplink data according to the indication of the DCI. When the terminal device fails to detect, it should transmit uplink data in the first U uplink subframe of the second FFP, and because of the failure to detect, it considers that the network device did not successfully LBT before the second FFP or does not send downlink signals at the second FFP for other reasons, at this time, the terminal device may delay data transmission to the FFP after the second FFP. At this time, the uplink data transmission of the terminal device collides with the uplink data transmission of other terminal devices.

Second case: the DCI of the S subframe PDCCH or EPDCCH of the third FFP may instruct the terminal device to transmit uplink data in the first U uplink subframe of the fourth FFP, and when the network device fails before the fourth FFP LBT, the network device does not transmit downlink signals, but because of a false alarm, the terminal device considers that the network device LBT is successful and transmits downlink signals, at this time, the terminal device does not perform LBT, and also does not meet the conditions of the MCOT sharing mechanism, uplink data is transmitted in the fourth FFP, at this time, the uplink data transmission of the terminal device violates the LBT rule of the FBE in the grant-free spectrum, and may collide with data transmission of other terminal devices or network devices.

For this reason, the behavior of the terminal device needs to be specified, so as to reduce the risk of regulations for uplink data transmission of the terminal device, and also to ensure that data transmission of the terminal device does not collide with data transmission of other terminal devices, which will be described in detail below.

With reference to the foregoing description, as shown in fig. 4, a flow chart of a data transmission method according to an embodiment of the present application is shown. Referring to fig. 4, the method includes:

step 401: the network device sends first control information to the terminal device within the first FFP.

Prior to step 401, the network device may occupy unlicensed spectrum by LBT.

After the network device occupies the unlicensed spectrum, the first control information may be transmitted over the unlicensed spectrum within the first FFP.

Optionally, the first FFP includes a first radio frame, for example, the first radio frame may include 5 subframes, and the uplink-downlink configuration of the first radio frame may be any configuration shown in fig. 1 or other configurations, which are not described herein.

Optionally, the second subframe of the first radio frame is a special subframe, and the network device may carry the first control information through PDCCH or EPDCCH in the special subframe of the first radio frame. The first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP.

Optionally, the first subframe of the first radio frame is a downlink subframe, and the network device may carry the first control information through PDCCH or EPDCCH in the downlink subframe of the first radio frame. The first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP.

Optionally, the second FFP is located after the first FFP, and N FFPs are spaced between the second FFP and the first FFP, where N is an integer greater than or equal to 0.

Alternatively, the value of N may be a fixed value.

Optionally, the value of N may be a non-fixed value, where S FFPs after the first FFP are all candidate second FFPs, where S is an integer greater than 0; the terminal equipment sequentially tries to receive second control information for a Z-th FFP after the first FFP according to the sequence of Z from small to large, wherein Z is a positive integer less than or equal to S; when the terminal equipment detects second control information at a Z-th FFP after the first FFP, determining an N value as Z-1; when the terminal equipment does not receive the second control information in S FFPs after the first FFP, determining the N value as S-1; optionally, the first control information is located in a PDCCH or ePDCCH of a downlink subframe or a special subframe with a subframe number N in a first FFP, where the first control information is used to schedule the terminal device to perform data transmission on an uplink subframe with a subframe number (n+n×v+k), where the uplink subframe with a subframe number (n+n×v+k) is located in a second FFP, where V represents the number of subframes included in one FFP, and optionally, the value of V is 5; the value of k can be the subframe interval between the downlink control information for scheduling uplink data transmission and the corresponding uplink data transmission in the existing TD-LTE communication system, and the value of k can be 4, 6, 7 and the like.

Optionally, the first control information is located in PDCCH or ePDCCH of a downlink subframe with subframe number n or a special subframe in the first FFP, where the first control information is used to schedule the terminal device to perform data transmission on an uplink subframe with subframe number n+k; when the terminal equipment receives the first control information and receives the second control information sent by the network equipment in the second FFP, the terminal equipment performs data transmission on an uplink subframe with a subframe number of (n+N×V+k), wherein V represents the number of subframes contained in one FFP, and optionally, the value of V is 5; the value of k can be the subframe interval between the downlink control information for scheduling uplink data transmission and the corresponding uplink data transmission in the existing TD-LTE communication system, and the value of k can be 4, 6, 7 and the like.

The first control information is for example used for scheduling the terminal device for uplink data transmission in a first uplink subframe within the second FFP. Of course, the first control information may also schedule the terminal device to perform uplink data transmission in other uplink subframes in the second FFP, which is not illustrated one by one.

The first control information is DCI carried in the PDCCH or the EPDCCH.

Step 402: the network device sends second control information to the terminal device in the second FFP.

Prior to step 402, the network device may occupy unlicensed spectrum by LBT.

After the network device occupies the unlicensed spectrum, second control information may be sent over the unlicensed spectrum within a second FFP.

Optionally, the second FFP includes a second radio frame, for example, the second radio frame may include 5 subframes, and the uplink-downlink configuration of the second radio frame may be any configuration shown in fig. 1 or other configurations, which are not described herein.

For example, the first subframe of the second radio frame is a downlink subframe, and the network device may carry the second control information through PDCCH or EPDCCH in the first subframe of the second radio frame.

The second control information is, for example, DCI carried by PDCCH or EPDCCH in the first subframe of the second radio frame.

Optionally, the second control information is used for scheduling the terminal device to perform uplink data transmission;

or, the second control information is used for scheduling the terminal equipment to receive downlink data;

or, the second control information is used for indicating the terminal equipment to adjust uplink transmission power;

Or the second control information is used for indicating the terminal equipment to receive system broadcast information;

or, the second control information is used for indicating the terminal equipment to receive paging information;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

alternatively, the CRC of the second control information is scrambled by RA-RNTI;

alternatively, the CRC of the second control information is scrambled through TC-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

or, the CRC of the second control information is scrambled through TPC-PUCCH-RNTI;

or, the CRC of the second control information is scrambled through TPC-PUSCH-RNTI;

alternatively, the CRC of the second control information is scrambled by the M-RNTI.

For example, as shown in fig. 5, subframes included in a first radio frame included in a first FFP are D, S, U, U, U in sequence; the subframes included in the second radio frame included in the second FFP are D, S, U, U, U in sequence. The network device carries the first control information through the PDCCH in the S subframe of the first radio frame, and carries the second control information through the PDCCH in the first D subframe of the second radio frame. The first control information is used for scheduling the terminal equipment to carry out uplink data transmission in a first U uplink subframe in the second FFP; the second control information is used for scheduling the terminal device to perform uplink data transmission in the last U uplink subframe in the second FFP.

As another example, as shown in fig. 6, subframes included in the first radio frame included in the first FFP are D, S, U, U, U in sequence; the subframes included in the second radio frame included in the second FFP are D, S, U, U, U in sequence. The network device carries the first control information through the PDCCH in the first D subframe of the first radio frame, and carries the second control information through the PDCCH in the first D subframe of the second radio frame. The first control information is used for scheduling the terminal equipment to carry out uplink data transmission in a first U uplink subframe in the second FFP; the second control information is used for scheduling the terminal device for downlink data reception in the first D subframe within the second FFP.

Step 403: within the first FFP, the terminal device receives first control information from the network device.

The first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP;

Alternatively, the value of N may be a fixed value.

Optionally, the value of N may be a non-fixed value, where S FFPs after the first FFP are all candidate second FFPs, where S is an integer greater than 0; the terminal equipment sequentially tries to receive second control information for a Z-th FFP after the first FFP according to the sequence of Z from small to large, wherein Z is a positive integer less than or equal to S; when the terminal equipment detects second control information at a Z-th FFP after the first FFP, determining an N value as Z-1; when the terminal equipment does not receive the second control information in S FFPs after the first FFP, determining the N value as S-1;

Optionally, the first control information is located in a PDCCH or ePDCCH of a downlink subframe or a special subframe with a subframe number N in a first FFP, where the first control information is used to schedule the terminal device to perform data transmission on an uplink subframe with a subframe number (n+n×v+k), where the uplink subframe with a subframe number (n+n×v+k) is located in a second FFP, where V represents the number of subframes included in one FFP, and optionally, the value of V is 5; the value of k can be the subframe interval between the downlink control information for scheduling uplink data transmission and the corresponding uplink data transmission in the existing TD-LTE communication system, and the value of k can be 4, 6, 7 and the like.

Step 404: and when the terminal equipment receives second control information sent by the network equipment in the second FFP, uplink data transmission is performed in the second FFP according to the first control information.

Optionally, in the embodiment of the present application, in the second FFP, the terminal device may send, at a candidate location of the PDCCH or EPDCCH, and verify, according to at least one preset radio network temporary identifier (radio network tempory identity, RNTI), a cyclic redundancy check (cyclic redundancy check, CRC) of data information carried in the candidate location; when the terminal equipment successfully verifies the CRC, the second control information carried in the data information can be received; and when the CRC verification of the candidate positions of all PDCCHs or EPDCCHs by the terminal equipment by using all preset RNTI is unsuccessful, the terminal equipment judges that the network equipment does not send the second control information in the second FFP.

Optionally, the at least one radio network temporary identity RNTI may be one or more of a C-RNTI (Cell RNTI, cell radio network temporary identity), SI-RNTI (System Information RNTI, system information radio network temporary identity), P-RNTI (Paging RNTI, paging radio network temporary identity), RA-RNTI (Random Access RNTI, random access radio network temporary identity), TC-RNTI (Temporary Cell RNTI, temporary Cell radio network temporary identity), SPS-C-RNTI (Semi persistence Scheduling Cell RNTI, semi-persistent scheduling Cell radio network temporary identity), TPC-PUCCH-RNTI (Transmit Power Control-Physical Uplink Control Channel-RNTI, physical uplink control channel transmission power control radio network temporary identity), TPC-PUSCH-RNTI (Transmit Power Control-Physical Uplink Shared Channel-RNTI, physical uplink shared channel transmission power control radio network temporary identity), M-RNTI (MBMS RNTI, multimedia broadcast multicast service radio network temporary identity).

Optionally, in the embodiment of the present application, in the second FFP, the terminal device may first detect whether a downlink signal, such as a cell-specific reference signal (cell-specific referecne signal, CRS), is transmitted by the network device. When the detection result of the terminal equipment considers that the network equipment sends a downlink signal, the network equipment sends a candidate position of PDCCH or EPDCCH, and the cyclic redundancy check (cyclic redundancy check, CRC) of data information carried in the candidate position is verified according to at least one preset wireless network temporary identifier (radio network tempory identity, RNTI); when the terminal equipment successfully verifies the CRC, the second control information carried in the data information can be received; and when the CRC verification of the candidate positions of all PDCCHs or EPDCCHs by the terminal equipment by using all preset RNTI is unsuccessful, the terminal equipment judges that the network equipment does not send the second control information in the second FFP.

Optionally, the at least one radio network temporary identifier RNTI may be one or more of C-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, SPS-C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, M-RNTI.

Accordingly, when the terminal device detection result indicates that the network device does not send the downlink signal, it may be determined that the network device does not send the second control information.

When the terminal device fails to verify the CRC, it may be determined that the second control information is not received within the second FFP. Optionally, when the terminal device determines that the network device does not send the second control information in the second FFP, the terminal device ignores the first control information, that is, the terminal device does not execute the content indicated by the first control information.

Optionally, when the terminal device does not receive the first control message of the first FFP, but successfully receives the second control message in the second FFP, and the second control message in the second FFP indicates that the terminal device performs uplink data transmission in a certain uplink subframe in the current FFP, if the uplink subframe is not the first uplink subframe in the current FFP, the terminal device may not perform uplink data transmission in a specific uplink subframe in the current FFP indicated by the second control message.

By the method, in the unlicensed spectrum, especially in the unlicensed spectrum of the FBE mode, when the first control information sent by the network device and the uplink subframe of the uplink data transmission of the terminal device scheduled by the first control information are not in the same FFP, the terminal device can check whether the network device sends the second control information in the second FFP through CRC, at the moment, the probability of false alarm is very small, at the moment, the uplink data transmission of the terminal device cannot collide with the data transmission of other devices, and the efficiency of data transmission in the unlicensed spectrum is improved. Accordingly, even if the terminal device fails to detect, the terminal device directly ignores the first control information after the terminal device fails to detect, so that the first control information is not delayed to a subsequent FFP, and therefore, the terminal device cannot collide with uplink data transmission of a normal terminal device.

In the embodiment of the present application, collision between uplink data transmission of the terminal device and uplink data transmission of other terminal devices may be avoided in other manners, which is described in detail below.

With reference to the foregoing description, as shown in fig. 7, a flow chart of a data transmission method according to an embodiment of the present application is shown. Referring to fig. 7, the method includes:

step 701: the network device determines to occupy unlicensed spectrum within the fourth FFP.

The network device may occupy the unlicensed spectrum in an LBT manner, and the specific content of the LBT is not described in detail.

Prior to step 701, the network device may occupy unlicensed spectrum in a third FFP by using LBT. The third FFP is located before the fourth FFP, M FFPs are arranged between the third FFP and the fourth FFP, and M is an integer greater than or equal to 0.

After the network device occupies the unlicensed spectrum in the third FFP, third control information may be sent to the terminal device through the unlicensed spectrum in the third FFP.

Optionally, a third radio frame is included in the third FFP. For example, the third radio frame may include 5 subframes, and the uplink-downlink configuration of the fourth radio frame may be any configuration shown in fig. 1, or may be other configurations, which are not described herein.

For example, the second subframe of the third radio frame is a special subframe, and the network device may carry the third control information through PDCCH or EPDCCH in the special subframe of the third radio frame. And the third control information is used for scheduling the terminal equipment to carry out uplink data transmission.

Optionally, the first subframe of the third radio frame is a downlink subframe, and the network device may carry the third control information through PDCCH or EPDCCH in the downlink subframe of the third radio frame. And the third control information is used for scheduling the terminal equipment to carry out uplink data transmission.

The third control information is used for scheduling the terminal device for uplink data transmission in a first uplink subframe within the FFP occupied by the network device. Of course, the third control information may also schedule the terminal device to perform uplink data transmission in other uplink subframes in the FFP occupied by the network device, which is not illustrated one by one.

The third control information is DCI carried in the PDCCH or the EPDCCH, for example.

Step 702: and the network equipment transmits fourth control information to the terminal equipment through the unlicensed spectrum in the fourth FFP.

The fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP.

Optionally, a fourth radio frame is included in the fourth FFP. For example, the fourth radio frame may include 5 subframes, and the uplink-downlink configuration of the fourth radio frame may be any configuration shown in fig. 1, or may be other configurations, which are not described herein.

Optionally, the first subframe of the fourth radio frame is a downlink subframe, the second subframe is a special subframe, and the network device may carry the fourth control information through PDCCH or EPDCCH in the first subframe or the second subframe of the fourth radio frame.

Optionally, the fourth control information is DCI carried in the PDCCH or the EPDCCH.

Optionally, the fourth control information includes a first information field, where the first information field includes K bits; and when the K bit values in the first information domain are first preset values, the K bit values are used for indicating the network equipment to occupy the unlicensed spectrum in the fourth FFP, and K is an integer greater than or equal to 0.

The first preset value is a preset value, which is not limited in the embodiment of the present application.

For example, K is 2, the first preset value is 11, and when the 2 bits in the first information domain are 11, the first preset value may be used to instruct the network device to occupy the unlicensed spectrum in the fourth FFP.

Optionally, the fourth control information includes a second information field, where the second information field includes L bits; and when the L bit values in the second information domain are second preset values, the L bit values are used for indicating the terminal equipment to perform uplink data transmission in the fourth FFP according to the third control information, and L is an integer greater than 0.

The second preset value has an association relationship with the value of M, and the second preset value may be equal to M, or may be equal to other values having a specific association relationship with the value of M. For example, as shown in fig. 8, M is 1, l is 3, the second preset value is 001, and when the 3 bits in the first information domain are 001, the second preset value may be used to instruct the network device to occupy the unlicensed spectrum in the fourth FFP.

Optionally, when the L bits in the second information domain are equal to a second preset value, the method may further be used to indicate that the network device does not occupy the unlicensed spectrum in M FFPs before the fourth FFP.

Step 703: the terminal device receives third control information from the network device over the unlicensed spectrum within the third FFP.

And the third control information is used for scheduling the terminal equipment to carry out uplink data transmission.

Step 704: and when the terminal equipment is in a fourth FFP, receiving fourth control information from the network equipment through the unlicensed spectrum, and carrying out uplink data transmission in the fourth FFP according to the third control information.

Optionally, in the fourth FFP, the terminal device may send, at a candidate position of the PDCCH or EPDCCH, and verify, according to at least one preset RNTI, a CRC of data information carried in the candidate position; and when the CRC verification is successful by the terminal equipment, and the K bit values obtained from the preset positions of the data information carried in the candidate positions are first preset values, judging that the fourth control information is included in the data information carried in the candidate positions, wherein the preset positions are positions of a first information field in the fourth control information. Correspondingly, if the terminal device determines that the value of the K bits at the preset position is not the first preset value, it may determine that the fourth control information is not received in the fourth FFP. Optionally, when the terminal device determines that the network device does not send the fourth control information in the fourth FFP, the terminal device continues to monitor whether the network device sends the fourth control information in other FFPs.

By the method, in the unlicensed spectrum, particularly in the unlicensed spectrum of the FBE mode, when the third control information sent by the network device and the uplink subframe of the terminal device scheduled by the third control information for uplink data transmission are not in the same FFP, the terminal device can judge whether the network device occupies the unlicensed spectrum in the fourth FFP through the fourth control information, the probability of false alarm is very small, and at the moment, the uplink data transmission of the terminal device cannot collide with the uplink data transmission of other terminal devices, so that the efficiency of data transmission in the unlicensed spectrum is improved. Since the third control information cannot be validated independently, the FFP in which the third control information is validated must be indicated by the fourth control information, so that the terminal device must be in the FFP where the network device occupies the unlicensed spectrum when performing uplink data transmission according to the third control information, uplink data of the terminal device cannot collide with uplink data of other terminal devices, and efficiency of performing data transmission in the unlicensed spectrum is improved.

Fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application. The terminal device may be configured to perform the actions of the terminal device in the above method embodiments, where the terminal device 900 includes: a transceiver unit 901 and a processing unit 902.

When the terminal device 900 performs the actions of the terminal device in the flow shown in fig. 4, the transceiver unit 901 and the processing unit 902 perform the following steps:

a transceiver unit 901, configured to receive first control information from a network device in a first fixed frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in the second FFP; the second FFP is located behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0.

Alternatively, the value of N may be a fixed value.

Optionally, the value of N may be a non-fixed value, where S FFPs after the first FFP are all candidate second FFPs, where S is an integer greater than 0; the terminal equipment sequentially tries to receive second control information for a Z-th FFP after the first FFP according to the sequence of Z from small to large, wherein Z is a positive integer less than or equal to S; when the terminal equipment detects second control information at a Z-th FFP after the first FFP, determining an N value as Z-1; when the terminal device does not receive the second control information in S FFPs after the first FFP, the N value is determined as S-1.

And the processing unit 902 is configured to, when receiving that the network device sends second control information in the second FFP, perform uplink data transmission in the second FFP according to the first control information.

In an alternative embodiment, the processing unit 902 is further configured to:

and when the network equipment is judged to not send the second control information in the second FFP, the first control information is ignored.

In an alternative embodiment, the processing unit 902 is specifically configured to:

in the second FFP, sending a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH at the network equipment, and verifying CRC of data information carried in the candidate position according to at least one preset radio network temporary identifier RNTI;

When the CRC verification is successful, the second control information carried in the data information is received; and when the processing unit 902 uses all preset RNTIs to perform CRC verification on candidate positions of all PDCCHs or EPDCCHs, determining that the network device does not send the second control information in the second FFP.

within the second FFP, it is detected whether a downlink signal, such as a cell specific reference signal, is transmitted by the network device. When the detection result shows that the network equipment sends a downlink signal, the network equipment sends a candidate position of PDCCH or EPDCCH, and the CRC of data information carried in the candidate position is verified according to at least one preset RNTI; when the processing unit 902 verifies the CRC successfully, the second control information carried in the data information may be received.

Accordingly, when the processing unit 902 detects that the network device does not send the downlink signal, it may determine that the network device does not send the second control information; correspondingly, when the processing unit 902 detects that the network device sends the downlink signal, but the processing unit 902 uses all preset RNTIs to perform CRC verification on all candidate positions of the PDCCH or EPDCCH, it is determined that the network device does not send the second control information in the second FFP.

In an alternative embodiment, the second control information is used to schedule the terminal device to perform uplink data transmission;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

Or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

In an alternative embodiment, when the transceiving unit 902 does not receive the first control message of the first FFP, but successfully receives the second control message in the second FFP, and the second control message in the second FFP indicates that the terminal device performs uplink data transmission in a certain uplink subframe in the current FFP, if the uplink subframe is not the first uplink subframe in the current FFP, the transceiving unit 901 and the processing unit 902 may not perform uplink data transmission in a specific uplink subframe in the current FFP indicated by the second control message.

When the terminal device 900 performs the actions of the terminal device in the flow shown in fig. 7, the transceiver unit 901 and the processing unit 902 perform the following steps:

A transceiver unit 901, configured to receive third control information from the network device through the unlicensed spectrum in a third fixed frame period FFP; the third control information is used for scheduling the terminal equipment to carry out uplink data transmission;

a processing unit 902, configured to, when fourth control information from a network device is received in a fourth FFP through the unlicensed spectrum, perform uplink data transmission in the fourth FFP according to the third control information;

the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and is spaced from the fourth FFP by M FFPs, and M is an integer greater than or equal to 0.

in the fourth FFP, sending a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH at the network device, and verifying a CRC of data information carried in the candidate position according to at least one preset RNTI; and when the CRC verification is successful and the K bit values obtained from the preset position of the data information carried in the candidate position are the first preset value, judging that the data information carried in the candidate position comprises the fourth control information.

Fig. 10 is a schematic diagram of a network device according to an embodiment of the present application. The network device may be configured to perform the actions of the network device in the above method embodiments, where the network device 1000 includes: a transceiver unit 1001 and a processing unit 1002.

When the network device 1000 performs the actions of the network device in the flow shown in fig. 4, the transceiver unit 1001 and the processing unit 1002 perform the following steps:

a processing unit 1002 configured to generate first control information;

a transceiver 1001, configured to send first control information to a terminal device in a first frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0; and sending second control information to the terminal equipment in the second FFP.

Alternatively, the value of N may be a fixed value.

or the second control information is used for scheduling the terminal equipment to receive downlink data;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

When the network device 1000 performs the operation of the network device in the flow shown in fig. 7, the transceiver unit 1001 and the processing unit 1002 perform the following steps:

a processing unit 1002 configured to determine that the unlicensed spectrum is occupied in a fourth fixed frame period FFP;

a transceiver unit 1001, configured to send fourth control information to a terminal device through the unlicensed spectrum in the fourth FFP; the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and an interval M FFPs with the fourth FFP is an integer greater than or equal to 0.

In an alternative embodiment, the transceiver unit 1001 is further configured to:

transmitting the third control information to a terminal device in the third FFP; and the third control information is used for scheduling the terminal equipment to carry out uplink data transmission.

Fig. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application. The wireless terminal device shown in fig. 11 may be an implementation of a hardware circuit of the terminal device shown in fig. 9. For convenience of explanation, fig. 11 shows only major components of the terminal device. As shown in fig. 11, terminal device 1100 includes a processor 1101 coupled to a memory 1102, a transceiver 1103, an antenna 1104, and a display 1105. The processor 1101 is mainly configured to process the communication protocol and the communication data, and to control the entire wireless terminal device, execute a software program, and process the data of the software program, for example, to support the terminal device to perform the actions described in the above-described method embodiments. The memory 1102 is used primarily to store software programs and data. The transceiver 1103 is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna 1104 is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves in cooperation with the transceiver 1103. The display screen 1105 is mainly used for receiving instructions input by a user and displaying images, data and the like for the user. The terminal device 1100 may also include other components, such as a speaker, etc., which are not described in detail herein.

When the terminal device 1100 performs the actions of the terminal device in the flow shown in fig. 4, the following steps may be performed:

a transceiver 1103 for receiving first control information from a network device during a first fixed frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in the second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0;

optionally, the value of N may be a fixed value;

optionally, the first control information is located in a PDCCH or ePDCCH of a downlink subframe or a special subframe with a subframe number N in a first FFP, where the first control information is used to schedule the terminal device to perform data transmission on an uplink subframe with a subframe number (n+n×v+k), where the uplink subframe with a subframe number (n+n×v+k) is located in a second FFP, where V represents the number of subframes included in one FFP, and optionally, the value of V is 5; the value of k can be the subframe interval between the downlink control information for scheduling uplink data transmission and the corresponding uplink data transmission in the existing TD-LTE communication system, and the like, and the value of k can be 4, 6, 7 and the like;

Optionally, the first control information is located in PDCCH or ePDCCH of a downlink subframe with subframe number n or a special subframe in the first FFP, where the first control information is used to schedule the terminal device to perform data transmission on an uplink subframe with subframe number n+k; when the terminal equipment receives the first control information and receives the second control information sent by the network equipment in the second FFP, the terminal equipment performs data transmission on an uplink subframe with a subframe number of (n+N×V+k), wherein V represents the number of subframes contained in one FFP, and optionally, the value of V is 5; the value of k can be the subframe interval between the downlink control information for scheduling uplink data transmission and the corresponding uplink data transmission in the existing TD-LTE communication system, and the like, and the value of k can be 4, 6, 7 and the like;

and the processor 1101 is configured to, when receiving that the network device transmits second control information in the second FFP, perform uplink data transmission in the second FFP according to the first control information.

In an alternative embodiment, the processor 1101 is further configured to:

In an alternative embodiment, the processor 1101 is specifically configured to:

in the second FFP, sending a candidate location of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH at the network device, and verifying a CRC of data information carried in the candidate location according to at least one preset radio network temporary identifier RNTI, where the at least one radio network temporary identifier RNTI may be one or more of a C-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, SPS-C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, and M-RNTI;

when the CRC verification is successful, the second control information carried in the data information is received; and when the CRC verification of the candidate positions of all PDCCHs or EPDCCHs by using all preset RNTIs is not successful, the processor 1101 determines that the network device does not transmit the second control information in the second FFP.

In an alternative embodiment, the processor 1101 is specifically configured to:

within the second FFP, it is detected whether a downlink signal, such as a cell specific reference signal, is transmitted by the network device. When the detection result shows that the network equipment sends a downlink reference signal, the network equipment sends a candidate position of PDCCH or EPDCCH, and the CRC of data information carried in the candidate position is verified according to at least one preset RNTI; when the processor 1101 successfully verifies the CRC, the second control information carried in the data information may be received; and when the processor 1101 detects that the network device sends the downlink signal, but the processor 1101 uses all preset RNTIs to perform CRC verification on all candidate positions of the PDCCH or EPDCCH, it is determined that the network device does not send the second control information in the second FFP. .

Accordingly, when the processor 1101 detects that the network device does not transmit the downlink reference signal, it may be determined that the network device does not transmit the second control information.

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

In an alternative embodiment, the processor 1101 and the transceiver 1103 are specifically configured to:

when the transceiver 1103 does not receive the first control message of the first FFP, but successfully receives the second control message in the second FFP, and the second control message in the second FFP indicates that the terminal device performs uplink data transmission in a certain uplink subframe in the current FFP, if the uplink subframe is not the first uplink subframe in the current FFP, the processor 1101 and the transceiver 1103 may not perform uplink data transmission in a specific uplink subframe in the current FFP indicated by the second control message.

When the terminal device 1100 performs the actions of the terminal device in the flow shown in fig. 7, the following steps may be performed respectively:

a transceiver 1103 for receiving third control information from the network device over the unlicensed spectrum in a third fixed frame period FFP; the third control information is used for scheduling the terminal equipment to carry out uplink data transmission;

a processor 1101, configured to, when fourth control information from a network device is received in a fourth FFP over the unlicensed spectrum, perform uplink data transmission in the fourth FFP according to the third control information;

In an alternative embodiment, the processor 1101 is specifically configured to:

in the fourth FFP, sending a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH at the network device, and verifying a cyclic redundancy check (cyclic redundancy check, CRC) of data information carried in the candidate position according to at least one preset radio network temporary identifier (radio network tempory identity, RNTI); and when the CRC verification is successful and the K bit values obtained from the preset position of the data information carried in the candidate position are the first preset value, judging that the data information carried in the candidate position comprises the fourth control information.

Fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application. The network device may be configured to perform the actions of the network device in the method embodiments described above. The network device shown in fig. 12 may be an implementation of one hardware circuit of the network device shown in fig. 10. For ease of illustration, fig. 12 shows only the main components of the communication device. Alternatively, the communication device may be a network device, or a device in a network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices. Alternatively, taking the communication apparatus as a network device, as shown in fig. 12, the network device 1200 includes a processor 1201, a memory 1202, a communication module 1203, an antenna 1204, and the like.

When the network device 1200 performs the actions of the network device in the flow shown in fig. 4, the following steps may be performed respectively:

a processor 1201 for generating first control information;

a communication module 1203 configured to send first control information to the terminal device in a first frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0; transmitting second control information to the terminal equipment in the second FFP;

optionally, the value of N may be a fixed value;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

When the network device 1200 performs the actions of the network device in the flow shown in fig. 7, the following steps may be performed respectively:

a processor 1201 configured to determine that the unlicensed spectrum is occupied during a fourth fixed frame period FFP;

a communication module 1203, configured to send fourth control information to a terminal device through the unlicensed spectrum in the fourth FFP; the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and an interval M FFPs with the fourth FFP is an integer greater than or equal to 0.

In an alternative embodiment, the communication module 1203 is further configured to:

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A data transmission method, comprising:

in a first fixed frame period FFP, the terminal equipment receives first control information from the network equipment; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0;

and when the terminal equipment receives second control information sent by the network equipment in the second FFP, uplink data transmission is performed in the second FFP according to the first control information.

2. The method according to claim 1, wherein the method further comprises:

and when the terminal equipment judges that the network equipment does not send the second control information in the second FFP, the first control information is ignored.

3. The method according to claim 1 or 2, wherein the terminal device receiving the second control information sent by the network device within the second FFP comprises:

in the second FFP, the terminal device sends a candidate location of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH in the network device, and verifies a cyclic redundancy check CRC of data information carried in the candidate location according to at least one preset radio network temporary identifier RNTI, where the at least one radio network temporary identifier RNTI is one or more of a C-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, SPS-C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, and M-RNTI; and when the CRC verification is successful, the terminal equipment receives the second control information carried in the data information.

4. The method according to claim 1 or 2, characterized in that the second control information is used for scheduling the terminal device for uplink data transmission;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

5. A data transmission method, comprising:

the network equipment sends first control information to the terminal equipment in a first frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0;

The network device sends second control information to the terminal device in the second FFP.

6. The method of claim 5, wherein the second control information is used to schedule the terminal device for uplink data transmission;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

7. A data transmission method, comprising:

the network equipment determines that the unlicensed spectrum is occupied in a fourth fixed frame period FFP;

the network device sends fourth control information to the terminal device through the unlicensed spectrum in the fourth FFP; the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and an interval M FFPs with the fourth FFP is an integer greater than or equal to 0.

8. The method of claim 7, wherein the network device determines that unlicensed spectrum is occupied within a fourth FFP, the method further comprising:

the network equipment sends the third control information to terminal equipment in the third FFP; and the third control information is used for scheduling the terminal equipment to carry out uplink data transmission.

9. The method according to claim 7 or 8, wherein the fourth control information comprises a first information field, the first information field comprising K bits; and when the K bit values in the first information domain are first preset values, the K bit values are used for indicating the network equipment to occupy the unlicensed spectrum in the fourth FFP, and K is an integer greater than or equal to 0.

10. The method according to claim 7 or 8, wherein the fourth control information comprises a second information field, the second information field comprising L bits; and when the L bit values in the second information domain are second preset values, the L bit values are used for indicating the terminal equipment to perform uplink data transmission in the fourth FFP according to the third control information, and L is an integer greater than 0.

11. A data transmission method, comprising:

the terminal equipment receives third control information from the network equipment through the unlicensed spectrum in a third fixed frame period FFP; the third control information is used for scheduling the terminal equipment to perform uplink data transmission;

when the terminal equipment is in a fourth FFP, fourth control information from the network equipment is received through the unlicensed spectrum, and uplink data transmission is performed in the fourth FFP according to the third control information;

12. The method of claim 11, wherein the fourth control information includes a first information field, the first information field including K bits; and when the K bit values in the first information domain are first preset values, the K bit values are used for indicating the network equipment to occupy the unlicensed spectrum in the fourth FFP, and K is an integer greater than or equal to 0.

13. The method of claim 12, wherein the terminal device receives fourth control information from the network device over the unlicensed spectrum during a fourth fixed frame period, FFP, comprising:

in the fourth FFP, the terminal device sends a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH in the network device, and verifies a cyclic redundancy check CRC of data information carried in the candidate position according to at least one preset radio network temporary identifier RNTI;

And when the CRC verification is successful by the terminal equipment, and the K bit values obtained from the preset positions of the data information carried in the candidate positions are the first preset values, judging that the data information carried in the candidate positions comprises the fourth control information.

14. The method according to any of claims 11 to 13, wherein the fourth control information comprises a second information field, the second information field comprising L bits; and when the L bit values in the second information domain are second preset values, the L bit values are used for indicating the terminal equipment to perform uplink data transmission in the fourth FFP according to the third control information, and L is an integer greater than 0.

15. A terminal device, comprising:

a transceiver unit, configured to receive first control information from a network device in a first fixed frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in the second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0;

and the processing unit is used for carrying out uplink data transmission according to the first control information in the second FFP when the network equipment is judged to send second control information in the second FFP.

16. The terminal device of claim 15, wherein the processing unit is further configured to:

17. Terminal device according to claim 15 or 16, wherein the processing unit is specifically configured to:

in the second FFP, a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH is sent in the network equipment, and Cyclic Redundancy Check (CRC) of data information carried in the candidate position is verified according to at least one preset Radio Network Temporary Identifier (RNTI), wherein the at least one Radio Network Temporary Identifier (RNTI) is one or more of C-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, SPS-C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI and M-RNTI;

and when the CRC verification is successful, judging that the data information carries the second control information.

18. The terminal device according to claim 15 or 16, wherein the second control information is used for scheduling the terminal device for uplink data transmission;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

19. A network device, comprising:

the processing unit is used for generating first control information;

a transceiver unit, configured to send first control information to a terminal device in a first frame period FFP; the first control information is used for scheduling the terminal equipment to perform uplink data transmission in a second FFP; the second FFP is positioned behind the first FFP, N FFPs are arranged between the second FFP and the first FFP at intervals, and N is an integer greater than or equal to 0; and sending second control information to the terminal equipment in the second FFP.

20. The network device of claim 19, wherein the second control information is used to schedule the terminal device for uplink data transmission;

or, the CRC of the second control information is scrambled through the C-RNTI;

or, the CRC of the second control information is scrambled through SI-RNTI;

or, the CRC of the second control information is scrambled through the P-RNTI;

or, the CRC of the second control information is scrambled through SPS-C-RNTI;

21. A network device, comprising:

a processing unit, configured to determine that an unlicensed spectrum is occupied in a fourth fixed frame period FFP;

a transceiver unit, configured to send fourth control information to a terminal device through the unlicensed spectrum in the fourth FFP; the fourth control information is used for indicating the network device to occupy the unlicensed spectrum in the fourth FFP, and is used for indicating the terminal device to perform uplink data transmission in the fourth FFP according to third control information sent by the network device in a third FFP, wherein the third FFP is located before the fourth FFP, and an interval M FFPs with the fourth FFP is an integer greater than or equal to 0.

22. The network device of claim 21, wherein the transceiver unit is further configured to:

23. The network device according to claim 21 or 22, wherein the fourth control information comprises a first information field, the first information field comprising K bits; and when the K bit values in the first information domain are first preset values, the K bit values are used for indicating the network equipment to occupy the unlicensed spectrum in the fourth FFP, and K is an integer greater than or equal to 0.

24. The network device according to claim 21 or 22, wherein the fourth control information comprises a second information field, the second information field comprising L bits; and when the L bit values in the second information domain are second preset values, the L bit values are used for indicating the terminal equipment to perform uplink data transmission in the fourth FFP according to the third control information, and L is an integer greater than 0.

25. A terminal device, comprising:

a transceiver unit, configured to receive third control information from the network device through the unlicensed spectrum in a third fixed frame period FFP; the third control information is used for scheduling the terminal equipment to carry out uplink data transmission;

a processing unit, configured to, when fourth control information from a network device is received in a fourth FFP through the unlicensed spectrum, perform uplink data transmission in the fourth FFP according to the third control information;

26. The terminal device according to claim 25, wherein the fourth control information comprises a first information field, the first information field comprising K bits; and when the K bit values in the first information domain are first preset values, the K bit values are used for indicating the network equipment to occupy the unlicensed spectrum in the fourth FFP, and K is an integer greater than or equal to 0.

27. The terminal device according to claim 25, wherein the processing unit is specifically configured to:

in the fourth FFP, sending a candidate position of a physical downlink control channel PDCCH or an enhanced physical downlink control channel EPDCCH at the network device, and verifying a cyclic redundancy check CRC of data information carried in the candidate position according to at least one preset radio network temporary identifier RNTI;

and when the CRC verification is successful and the K bit values obtained from the preset position of the data information carried in the candidate position are the first preset value, judging that the data information carried in the candidate position comprises the fourth control information.

28. The terminal device according to claim 25, wherein the transceiver unit and the processing unit are specifically configured to:

The receiving and transmitting unit receives a second information field in the fourth control information, wherein the second information field comprises L bits; and when the processing unit judges that the L bit values in the second information domain are second preset values, the receiving and transmitting unit performs uplink data transmission in the fourth FFP according to the third control information, wherein L is an integer larger than 0.

29. A data transmission apparatus, comprising: a memory for storing instructions and a processor for executing the instructions stored in the memory, and execution of the instructions stored in the memory causes the processor to perform the method of any one of claims 1 to 14.

30. A computer readable storage medium comprising computer readable instructions which, when read and executed by a data transmission device, cause the data transmission device to perform the method of any one of claims 1 to 14.