CN110830179B - User equipment, base station and data transmission method and device thereof - Google Patents
User equipment, base station and data transmission method and device thereof Download PDFInfo
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- CN110830179B CN110830179B CN201810913977.0A CN201810913977A CN110830179B CN 110830179 B CN110830179 B CN 110830179B CN 201810913977 A CN201810913977 A CN 201810913977A CN 110830179 B CN110830179 B CN 110830179B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
Abstract
The data transmission method comprises the following steps: in the unlicensed frequency band of the 5G new air interface, the user equipment sends uplink data and associated UCI to the base station in an AUL transmission mode; the base station identifies the user equipment which sends the uplink data through the UE specific DMRS; the base station decodes the UCI; under the condition that UCI cannot be decoded successfully, a base station transmits DCI to the user equipment, wherein the DCI comprises first information; the user equipment determines the HARQ-ID needing retransmission through the first information; the user equipment performs a scheduling-based retransmission. The invention can still realize retransmission based on scheduling under the condition that the base station fails to successfully decode the UCI, thereby improving the flexibility of data retransmission.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a user equipment, a base station, and a data transmission method and apparatus thereof.
Background
The 5G new air interface (5GNR) is a global 5G standard designed based on a new air interface of an OFDM (Orthogonal Frequency Division Multiplexing) technology, and is also a basis of a next-generation cellular mobile communication technology, and the 5G new air interface has many advantages of lower time delay, higher reliability and the like. Recently, the independent networking standard of the fifth generation mobile communication technology 5G new air interface has been approved by the international standards organization 3GPP (third generation partnership project) conference.
In LTE feLAA (funther Enhanced qualified-Assisted Access), AUL transmission (Autonomous/Autonomous UpLink transmission) is introduced. When the user equipment performs the AUL transmission, it is not required to send a sr (scheduling request) first, and after the LBT (listen before send) is successful, the uplink data may be directly sent on the time-frequency resource pre-allocated by the AUL. And the time delay can be obviously reduced by adopting an AUL transmission mode.
In the AUL transmission, due to the uncertainty of LBT, HARQ-ACK feedback of the base station to the AUL is also uncertain, and after receiving HARQ-ACK feedback NACK (negative ACK) of the base station, the user equipment also does not determine the retransmission time for a certain Transport Block (TB).
The feLAA defines an AUL-DFI (downlink Feedback information) for feeding back data of the AUL, and one bitmap is used in the AUL-DFI for feeding back all HARQ (Hybrid Automatic Repeat reQuest) processes.
When performing AUL transmission, a base station configures an HARQ-ID set that can be used for AUL transmission, and a UE selects one HARQ-ID in the set, determines an NDI (New Data Indicator) and an RV (redundancy version), and informs the base station through UCI (Uplink Control Information), where the UE-ID is also included in the UCI. The UCI and an AUL PUSCH (Physical Uplink Shared Channel) are sent to a base station together, the base station decodes the UCI after receiving the UCI and the PUSCH, and decodes the PUSCH after knowing information such as UE-ID, HARQ-ID, NDI, RV and the like through the UCI.
The AUL supports two retransmission modes: scheduling based retransmissions and AUL retransmissions. Wherein, the retransmission based on scheduling means that when the user equipment receives an uplink scheduling (UL grant), and the HARQ-ID, TBS, NDI indicated by the uplink scheduling is completely consistent with the previous transmission of one of the AULs, the user equipment performs retransmission based on scheduling on the transmission block on the time-frequency resource indicated by the uplink scheduling; the AUL retransmission (also called scheduling-free retransmission) means that the user equipment receives the AUL-DFI to indicate that a certain HARQ process is NACK, or the user equipment does not receive uplink scheduling information or the AUL-DFI of any base station for a certain period of time after transmission of a transport block of the certain HARQ process, and at this time, the user equipment may also adopt a retransmission mode of the AUL retransmission.
At present, a 5G new air interface also performs standardization work on an unlicensed band (unlicensed band), and similar to that in LTE feLAA, the 5G new air interface may also transmit a PUSCH in a scheduling-free manner. And researching the non-authorized frequency band of the 5G new air interface on the NR configured grant base station for the non-scheduled uplink transmission.
Like LTE feLAA, in the unlicensed band of the 5G new air interface, the HARQ process ID, NDI, and RVID are told to the base station in the UCI manner, and the unlicensed band of the 5G new air interface also supports DFI to feed back uplink data. Different from LTE feLAA, the unlicensed frequency band of the 5G new air interface does not include information of UE id in UCI, the UE id is distinguished in the unlicensed frequency band of the 5G new air interface by UE specific DMRS, which is a user-specific reference signal in the 5G new air interface.
That is, in LTE feLAA, when the UE transmits uplink data in a scheduling-free manner, the UE-ID is reported in UCI at the same time, the base station obtains the UE-ID and other information (including HARQ-ID, NDI, RVID, etc.) by decoding the UCI, and the base station may use retransmission based on scheduling when UCI is decoded correctly and uplink data is not decoded successfully. However, when UCI fails to decode successfully, the base station cannot obtain the UE-ID, and thus cannot know which user equipment transmitted data, and cannot adopt retransmission by scheduling.
However, in the unlicensed frequency band of the 5G new air interface, there is no research on this aspect in the prior art.
Disclosure of Invention
The technical problem solved by the invention is as follows: in the unlicensed frequency band of the 5G new air interface, how to improve the flexibility of data retransmission for the data transmission mode of the AUL transmission.
In order to solve the above technical problem, an embodiment of the present invention provides a data transmission method, including:
in the unlicensed frequency band of the 5G new air interface, the user equipment sends uplink data and associated UCI to the base station in an AUL transmission mode;
the base station identifies the user equipment which sends the uplink data through the UE specific DMRS;
the base station decodes the UCI;
under the condition that UCI cannot be decoded successfully, a base station transmits DCI to the user equipment, wherein the DCI comprises first information;
the user equipment receives the DCI;
the user equipment determines the HARQ-ID needing retransmission through the first information;
the user equipment performs a scheduling-based retransmission.
Optionally, before the sending the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
Optionally, the UCI includes HARQ-ID, NDI, and RVID associated with the uplink data.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission method, including:
in the unlicensed frequency band of the 5G new air interface, sending uplink data and associated UCI to a base station in an AUL transmission mode, wherein the base station can identify user equipment sending the uplink data through UE specific DMRS;
receiving DCI, wherein the DCI comprises first information;
determining the HARQ-ID needing retransmission through the first information;
a scheduling based retransmission is made.
Optionally, before the sending the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
Optionally, the UCI includes HARQ-ID, NDI, and RVID associated with the uplink data.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission method, including:
receiving uplink data and associated UCI sent by user equipment in an unlicensed frequency band of a 5G new air interface in an AUL transmission mode;
identifying the user equipment which transmits the uplink data through the UE specific DMRS;
decoding the UCI;
and sending DCI to the user equipment under the condition that the UCI cannot be successfully decoded, wherein the DCI comprises first information, and the user equipment can determine the HARQ-ID needing retransmission through the first information.
Optionally, before the sending the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
Optionally, the UCI includes HARQ-ID, NDI, and RVID associated with the uplink data.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission device, including: an uplink data sending unit, a downlink data receiving unit, an analysis unit and an uplink data retransmission unit; wherein:
the uplink data sending unit is suitable for sending uplink data and associated UCI to the base station in an AUL (autonomous Underwater language) transmission mode in an unlicensed frequency band of a 5G new air interface, and the base station can identify user equipment sending the uplink data through a UE specific DMRS (demodulation reference signal);
a downlink data receiving unit, adapted to receive DCI, where the DCI includes first information;
a parsing unit adapted to determine a HARQ-ID requiring retransmission through the first information;
and the uplink data retransmission unit is suitable for retransmission based on scheduling.
Optionally, before the sending the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
Optionally, the UCI includes HARQ-ID, NDI, and RVID associated with the uplink data.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission device, including: the device comprises an uplink data receiving unit, an identification unit, a decoding unit and an indication unit; wherein:
the uplink data receiving unit is suitable for receiving uplink data and associated UCI sent by the user equipment in an AUL (autonomous Underwater language) transmission mode in an unlicensed frequency band of a 5G new air interface;
an identification unit adapted to identify a user equipment transmitting the uplink data through a UE specific DMRS;
a decoding unit adapted to decode the UCI;
an indication unit, adapted to send DCI to the user equipment if UCI fails to be decoded successfully, where the DCI includes first information, and the user equipment can determine an HARQ-ID that needs to be retransmitted through the first information.
Optionally, before the sending the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
Optionally, the UCI includes HARQ-ID, NDI, and RVID associated with the uplink data.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
In order to solve the above technical problem, an embodiment of the present invention further provides a user equipment, where the user equipment supports an unlicensed frequency band of a 5G new air interface, and the user equipment further includes the data transmission device described above.
In order to solve the above technical problem, an embodiment of the present invention further provides a base station, where the base station supports an unlicensed frequency band of a 5G new air interface, and the base station further includes the data transmission device described above.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
in the 5G new air interface unlicensed frequency band, for the AUL transmission data transmission mode, a base station identifies user equipment sending uplink data through UE specific DMRS, and under the condition that UCI cannot be successfully decoded, the base station sends DCI to the user equipment, wherein the DCI comprises first information, and the user equipment determines HARQ-ID needing retransmission through the first information, so that under the condition that the UCI cannot be successfully decoded, retransmission based on scheduling can still be realized, the flexibility during data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
Drawings
FIG. 1 is a flowchart illustrating a data transmission method according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a data transmission method according to a second embodiment of the present invention;
FIG. 3 is a flowchart of a data transmission method according to a third embodiment of the present invention;
FIG. 4 is a block diagram of a data transmission apparatus according to a fourth embodiment of the present invention;
fig. 5 is a block diagram of a data transmission apparatus according to a fifth embodiment of the present invention.
Detailed Description
As can be seen from the analysis in the background art, in LTE feLAA, when the UE sends uplink data in a scheduling-free manner, UE-ID is reported in UCI at the same time, the base station obtains UE-ID and other information (including HARQ-ID, NDI, RVID, etc.) by decoding UCI, and when UCI is decoded correctly and uplink data is not decoded successfully, the base station may employ retransmission based on scheduling. However, when UCI fails to decode successfully, the base station cannot obtain the UE-ID, and thus cannot know which user equipment transmitted data, and cannot adopt retransmission by scheduling.
However, in the unlicensed frequency band of the 5G new air interface, there is no research on this aspect in the prior art.
The inventor finds that, in an unlicensed frequency band of a 5G new air interface, when a user equipment transmits uplink data in a scheduling-free manner, a base station may obtain a UE ID through a UE specific DMRS, which means that, in theory, the base station still has a possibility of notifying the user equipment of retransmission of a certain transport block by using scheduling-based retransmission in the case that UCI fails to be successfully decoded.
Therefore, the inventor designs a technical scheme of the present invention to realize that the base station can still use the retransmission based on scheduling to notify the user equipment to retransmit a certain transport block when the UCI fails to decode. The inventor considers that, under the above situation, the base station knows the UE-ID but does not know the HARQ-ID, and therefore, the present invention adds an extra DCI (Downlink Control Information) to notify the UE to perform retransmission based on scheduling, the base station indicates a difference between the reception time of a certain transport block and the time when the base station transmits the DCI in the DCI, and the user equipment determines the HARQ-ID that needs to be retransmitted according to the difference, thereby achieving the above object.
Compared with scheduling-free retransmission, the retransmission based on scheduling is more flexible, and the base station can indicate information such as time-frequency resources and MCS of retransmission in DCI.
In order that those skilled in the art will better understand and realize the present invention, the following detailed description is given by way of specific embodiments with reference to the accompanying drawings.
Example one
As described below, an embodiment of the present invention provides a data transmission method.
First, the data transmission method in this embodiment is applicable to data transmission between a base station and user equipment in an unlicensed frequency band of a 5G new air interface in an AUL transmission mode.
Referring to a flow chart of a data transmission method shown in fig. 1, the following detailed description is made through specific steps:
s101, the user equipment sends uplink data and associated UCI to the base station in an AUL transmission mode.
And in the unlicensed frequency band of the 5G new air interface, the user equipment sends uplink data and associated UCI to the base station in an AUL transmission mode.
The UCI comprises HARQ-ID, NDI and RVID associated with the uplink data.
Before the sending of the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
In the unlicensed frequency band of the 5G new air interface, after the user equipment successfully listens and then transmits, the uplink data is transmitted on the preconfigured resources in a scheduling-free manner, the HARQ-ID, the NDI, and the RVID associated with the data are reported in the UCI at the same time, the UCI is transmitted from the piggyback to the PUSCH, and the user equipment starts a timer after the data is transmitted.
And S102, the base station identifies the user equipment for sending the uplink data through the UE specific DMRS.
After receiving uplink data and control information sent by user equipment, the base station obtains the UE-ID of the user equipment sending the uplink data through the UE specific DMRS.
S103, the base station decodes the UCI.
The base station obtains HARQ-ID, NDI, RVID by decoding UCI. In case the UCI decoding is successful, i.e. the base station already knows the UE-ID and HARQ-ID, then the scheduling based retransmission in LTE feLAA can be referred to prior art.
The focus of the present discussion is on the case where UCI fails to decode successfully. In case the UCI fails to decode successfully, the base station may instruct the user equipment to retransmit the data in a scheduling-based manner.
Certainly, the possibility of feeding back NACK to HARQ-IDs that are not paired through DFI is not excluded, or the possibility of not sending HARQ-ID scheduling information or HARQ-ACK feedback information associated with the data to the UE is not excluded, and in this case, if the UE does not receive ACK feedback associated with the HARQ-ID or does not receive scheduling information associated with the HARQ-ID after the timer expires, the UE may retransmit the data in a scheduling-free manner.
S104, the base station sends DCI to the user equipment, wherein the DCI comprises first information.
And under the condition that the UCI cannot be decoded successfully, the base station transmits DCI to the user equipment, wherein the DCI comprises the first information.
The base station determines the information of HARQ-ID, NDI and the like of the data by indicating the transmission time of the retransmission data in the new DCI so that the user equipment can determine which data is indicated by the DCI. The sending time of the retransmission data is indicated to the user equipment in a relative time mode, and when the user equipment receives the retransmission which does not display the indication HARQ-ID, the user equipment can simultaneously report the HARQ-ID, the NDI and the RVID information in the UCI.
The base station may specifically instruct the retransmission data in a variety of different ways, for example:
in a first mode, the first information indicates a time difference between the transmission of the uplink scheduling information by the base station and the reception of the PUSCH by the base station.
The relative time indicated in the DCI is a time difference K between the transmission of the uplink scheduling information by the base station and the reception of the PUSCH by the base station, and the unit is slot. The set of K can be configured by higher layer signaling or can be a set of default values, and the DCI is used for indicating the bit number of K as
Where size (K) represents the number of elements in set K.
The following examples may be specific to the above-described mode:
example 1: and the user equipment succeeds in slot 0LBT, and adopts a PUSCH (with HARQ-ID of 2) and UCI which are transmitted in a scheduling-free mode. The user equipment side scheduling-free retransmission timer is 10ms, at this time, 15KHz SCS (subcarrier spacing) is adopted, and the time length of one slot is 1 ms. The scheduler-exempt retransmission timer starts timing from slot 1.
The base station receives PUSCH and UCI which are sent by user equipment in a scheduling-free mode in slot0, the base station obtains information of UE-ID through UE specific DMRS, but the base station makes a decoding error when the UCI is solved, the base station sends scheduling information in slot 5 by adopting the first information defined by the invention, and the relative time indicated in the DCI is 5.
Specifically, a set of Radio Resource Control (RRC) information configuration (K) is {2,3,4,5}, K is indicated by 2 bits in DCI, a first number (2) of the set of the RRC parameter configuration (K) corresponds to 00, a second number (3) of the set of the RRC parameter configuration (K) corresponds to 01, a third number (4) of the set of the RRC parameter configuration (K) corresponds to 10, a fourth number (5) of the set of the RRC parameter configuration (K) corresponds to 11, and at this time, DCI indicates K to be 11.
The user equipment receives the DCI in slot 5, obtains the value of K as 5 through DCI analysis, and determines that the base station schedules the retransmission of the PUSCH sent in slot0 so as to determine that the HARQ-ID of the PUSCH is 2. The user equipment sends the retransmission of the data with the HARQ-ID of 2 at the time-frequency position designated by the DCI, and simultaneously reports the HARQ-ID, the NDI and the RVID information in the UCI, and the UCI can piggyback to the PUSCH.
Example 2: and the user equipment succeeds in slot 0LBT, and adopts a PUSCH (with HARQ-ID of 2) and UCI which are transmitted in a scheduling-free mode. The user equipment side scheduling-free retransmission timer is 10ms, at the moment, 15KHz SCS is adopted, and the time length of one slot is 1 ms. The scheduler-exempt retransmission timer starts timing from slot 1.
The base station receives PUSCH and UCI which are sent by user equipment in a scheduling-free mode in slot0, obtains the information of the UE-ID through the UE specific DMRS, but makes a decoding error when the base station decodes the UCI.
The set of K defaults to {1,2,3,4}, K is indicated by 2 bits in DCI, the first number (1) of the set of K corresponds to 00, the second number (2) of the set of K corresponds to 01, the third number (3) of the set of K corresponds to 10, and the fourth number (4) of the set of K corresponds to 11.
The base station needs to do LBT before sending the scheduling information, because the LBT is unsuccessful, the base station can not send data in slot 4, the base station can successfully send data in slot 5LBT, at this time, if the first information defined by the invention is adopted to send the scheduling information, the relative time indicated in the DCI is 5. And 5 is not in the set of K, the base station does not transmit scheduling information for the PDSCH.
The user equipment still does not receive ACK feedback associated with HARQ-ID 2 in slot 10 and does not receive scheduling information associated with HARQ-ID 2, the user equipment sends data with scheduling-free retransmission HARQ-ID 2 after slot 10, and the user equipment LBT succeeds in slot 12 and sends retransmission and UCI of the data with HARQ-ID 2 in a scheduling-free mode.
In a second mode, the first information indicates a Time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received by the base station at a same COT (Channel Occupancy Time).
The relative time indicated in the DCI is a time difference K 'between a first PUSCH (or a last PUSCH) transmitted by the user equipment and a PUSCH received by the base station, where the time difference K' is received at a same COT base station and the unit is slot. The set of K can be configured by higher layer signaling or can be a set of default values, and the DCI is used for indicating the bit number of K' as
Where size (K ') represents the number of elements in set K'. The COT indicated by the DCI is a COT having a shortest time interval from the DCI until the time of transmitting the DCI, and the CTO includes PUSCH data transmitted by the user equipment without scheduling.
The following examples may be specific to the second mode:
example 3: and the user equipment successfully sends the PUSCH and the UCI in a slot 0LBT mode in a scheduling-free mode. The HARQ-ID of the PUSCH transmitted in slot0 is 0, the HARQ-ID of the PUSCH transmitted in slot 1 is 1, and the HARQ-ID of the PUSCH transmitted in slot2 is 2.
The user equipment side scheduling-free retransmission timer is 10ms, at the moment, 15KHz SCS is adopted, and the time length of one slot is 1 ms. The scheduling-free retransmission timer starts timing after the PUSCH transmission corresponding to each HARQ-ID. For HARQ-ID 0, starting timing from slot 1 by a scheduling-free retransmission timer; for HARQ-ID1, starting timing from slot2 by a scheduling-free retransmission timer; for HARQ-ID 2, the scheduler-free retransmission timer starts from slot 3.
The base station receives PUSCH and UCI which are sent by user equipment in a scheduling-free mode in slots 0,1 and 2, the base station obtains information of UE-ID through UE specific DMRS, but the base station makes a decoding error when decoding UCI received by slot 2.
If the base station succeeds in slot 6LTB, the first information defined by the present invention is used to transmit the scheduling information, and the relative time indicated in the DCI is 2.
Specifically, the set of RRC information configurations K ' is {0,1,2,3}, K ' is indicated by 2 bits in DCI, a first number (0) of the set of K ' of RRC parameter configurations corresponds to 00, a second number (1) of the set of K ' of RRC parameter configurations corresponds to 01, a third number (2) of the set of K ' of RRC parameter configurations corresponds to 10, and a fourth number (3) of the set of K ' of RRC parameter configurations corresponds to 11, where DCI indicates that K ' is 10.
The UE receives the DCI at slot 6, where the time interval between the UE and the DCI is shortest and the COT including the PUSCH free from scheduling transmission by the UE is COT1, and thus the UE determines that the reference point of the relative time indicated by the DCI is slot0 of COT1, and is at slot 0. The user equipment further obtains the value of K' as 2 through DCI analysis, and the user equipment determines that the base station schedules the retransmission of the PUSCH transmitted in slot2, thereby determining that the HARQ-ID of the PUSCH is 2. The user equipment sends the retransmission of the data with the HARQ-ID of 2 at the time-frequency position designated by the DCI, and simultaneously reports the HARQ-ID, the NDI and the RVID information in the UCI, and the UCI can piggyback to the PUSCH.
The base station may indicate the relative time through the first or second manner, and specifically, which manner is adopted may be indicated through higher layer signaling configuration or through DCI. When DCI indication is used, 1 bit is needed to indicate whether the mode one or the mode two is specific. If 1 indicates the mode one, 0 indicates the mode two; or 1 indicates the second mode and 0 indicates the first mode.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
If the number of scheduling-free resources which are configured by the base station for the user equipment and can simultaneously transmit the PUSCH is N, the DCI needs to be transmitted
A bit to indicate which scheduling free resource the base station receives.
S105, the user equipment receives the DCI.
As described above, the DCI includes the first information.
S106, the user equipment determines the HARQ-ID needing to be retransmitted through the first information.
S107, the user equipment performs retransmission based on the scheduling.
The above description of the technical solution shows that: in this embodiment, in an unlicensed frequency band of a 5G new air interface, for a data transmission mode of AUL transmission, a base station identifies, through a UE specific DMRS, a user equipment that transmits uplink data, and when UCI fails to be decoded successfully, the base station transmits DCI to the user equipment, where the DCI includes first information, and the user equipment determines, through the first information, an HARQ-ID that needs to be retransmitted, so that, when the UCI fails to be decoded successfully by the base station, retransmission based on scheduling can still be achieved, flexibility in data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
Example two
As described below, embodiments of the present invention provide a data transmission method, which may be generally implemented by a user equipment.
Referring to the flowchart of the data transmission method shown in fig. 2, the same or similar parts as those in the first embodiment are not described again here.
S201, sending uplink data and associated UCI to the base station in an AUL transmission mode.
In the unlicensed frequency band of the 5G new air interface, the user equipment sends uplink data and associated UCI to the base station in an AUL transmission mode, and the base station can identify the user equipment sending the uplink data through the UE specific DMRS.
The UCI comprises HARQ-ID, NDI and RVID associated with the uplink data.
Before the sending of the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
S202, receives the DCI.
The user equipment receives DCI, wherein the DCI comprises first information.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
S203, determining the HARQ-ID needing to be retransmitted through the first information.
S204, retransmission based on scheduling is carried out.
The above description of the technical solution shows that: in this embodiment, in an unlicensed frequency band of a 5G new air interface, for a data transmission mode of AUL transmission, a base station identifies, through a UE specific DMRS, a user equipment that transmits uplink data, and when UCI fails to be decoded successfully, the base station transmits DCI to the user equipment, where the DCI includes first information, and the user equipment determines, through the first information, an HARQ-ID that needs to be retransmitted, so that, when the UCI fails to be decoded successfully by the base station, retransmission based on scheduling can still be achieved, flexibility in data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
EXAMPLE III
As described below, embodiments of the present invention provide a data transmission method, which may be generally implemented by a base station.
Referring to the flowchart of the data transmission method shown in fig. 3, the same or similar parts as those in the first embodiment are not described again here.
S301, receiving uplink data and associated UCI sent by the user equipment in an AUL transmission mode.
In the unlicensed frequency band of the 5G new air interface, the base station receives uplink data and associated UCI sent by the user equipment in an AUL transmission mode.
The UCI comprises HARQ-ID, NDI and RVID associated with the uplink data.
Before the sending of the uplink data and the associated UCI to the base station in the AUL transmission mode, the method further includes: the concurrent listening is carried out first and then successfully.
S302, identifying the user equipment which sends the uplink data through the UE specific DMRS.
S303, decoding the UCI.
S304, sending DCI to the user equipment, wherein the DCI comprises first information.
And under the condition that UCI cannot be decoded successfully, the base station sends DCI to the user equipment, wherein the DCI comprises first information, and the user equipment can determine the HARQ-ID needing to be retransmitted through the first information.
Optionally, the first information indicates a time difference between the sending of the uplink scheduling information by the base station and the receiving of the PUSCH by the base station.
Optionally, the first information indicates a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and received at one same COT base station and the PUSCH received by the base station.
Optionally, when the base station configures multiple scheduling-free resources for the ue and the ue can transmit uplink data by using the multiple scheduling-free resources simultaneously, the base station indicates which resource is in the DCI.
The above description of the technical solution shows that: in this embodiment, in an unlicensed frequency band of a 5G new air interface, for a data transmission mode of AUL transmission, a base station identifies, through a UE specific DMRS, a user equipment that transmits uplink data, and when UCI fails to be decoded successfully, the base station transmits DCI to the user equipment, where the DCI includes first information, and the user equipment determines, through the first information, an HARQ-ID that needs to be retransmitted, so that, when the UCI fails to be decoded successfully by the base station, retransmission based on scheduling can still be achieved, flexibility in data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
Example four
As described below, an embodiment of the present invention provides a data transmission apparatus.
Referring to fig. 4, a block diagram of a data transmission apparatus is shown.
The data transmission apparatus includes: an uplink data transmitting unit 401, a downlink data receiving unit 402, an analyzing unit 403, and an uplink data retransmitting unit 404; the main functions of each unit are as follows:
an uplink data transmitting unit 401, adapted to transmit, in an unlicensed frequency band of a 5G new air interface, uplink data and an associated UCI to a base station in an AUL transmission manner, where the base station can identify, through a UE specific DMRS, a user equipment that transmits the uplink data;
a downlink data receiving unit 402, adapted to receive DCI, where the DCI includes first information;
a parsing unit 403 adapted to determine, through the first information, a HARQ-ID that needs to be retransmitted;
an uplink data retransmission unit 404 adapted to perform scheduling based retransmission.
The above description of the technical solution shows that: in this embodiment, in an unlicensed frequency band of a 5G new air interface, for a data transmission mode of AUL transmission, a base station identifies, through a UE specific DMRS, a user equipment that transmits uplink data, and when UCI fails to be decoded successfully, the base station transmits DCI to the user equipment, where the DCI includes first information, and the user equipment determines, through the first information, an HARQ-ID that needs to be retransmitted, so that, when the UCI fails to be decoded successfully by the base station, retransmission based on scheduling can still be achieved, flexibility in data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
In a specific implementation, before sending the uplink data and the associated UCI to the base station in the AUL transmission manner, the method may further include: the concurrent listening is carried out first and then successfully.
In a specific implementation, the UCI may include HARQ-ID, NDI, RVID associated with the uplink data.
In a specific implementation, the difference between the time of receiving a certain transport block and the time of transmitting DCI by the base station may be a time difference between the transmission of the uplink scheduling information by the base station and the reception of the PUSCH by the base station.
In a specific implementation, the difference between the receiving time of the certain transport block and the time when the base station transmits the DCI may be a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and the PUSCH received by the same COT base station.
In a specific implementation, when the base station configures multiple scheduling-free resources for the ue and the ue is capable of transmitting uplink data by using the multiple scheduling-free resources simultaneously, the base station may indicate which resource is in DCI.
EXAMPLE five
As described below, an embodiment of the present invention provides a data transmission apparatus.
Referring to fig. 5, a block diagram of a data transmission apparatus is shown.
The data transmission apparatus includes: an uplink data receiving unit 501, a recognizing unit 502, a decoding unit 503, and an instructing unit 504; the main functions of each unit are as follows:
an uplink data receiving unit 501, adapted to receive, in an unlicensed frequency band of a 5G new air interface, uplink data and associated UCI sent by a user equipment in an AUL transmission manner;
an identifying unit 502 adapted to identify a user equipment transmitting the uplink data through a UE specific DMRS;
a decoding unit 503 adapted to decode the UCI;
an indicating unit 504, adapted to send DCI to the user equipment if UCI fails to be decoded successfully, where the DCI includes first information, and the user equipment can determine, through the first information, a HARQ-ID that needs to be retransmitted.
The above description of the technical solution shows that: in this embodiment, in an unlicensed frequency band of a 5G new air interface, for a data transmission mode of AUL transmission, a base station identifies, through a UE specific DMRS, a user equipment that transmits uplink data, and when UCI fails to be decoded successfully, the base station transmits DCI to the user equipment, where the DCI includes first information, and the user equipment determines, through the first information, an HARQ-ID that needs to be retransmitted, so that, when the UCI fails to be decoded successfully by the base station, retransmission based on scheduling can still be achieved, flexibility in data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
In a specific implementation, before sending the uplink data and the associated UCI to the base station in the AUL transmission manner, the method may further include: the concurrent listening is carried out first and then successfully.
In a specific implementation, the UCI may include HARQ-ID, NDI, RVID associated with the uplink data.
In a specific implementation, the difference between the time of receiving a certain transport block and the time of transmitting DCI by the base station may be a time difference between the transmission of the uplink scheduling information by the base station and the reception of the PUSCH by the base station.
In a specific implementation, the difference between the receiving time of the certain transport block and the time when the base station transmits the DCI may be a time difference between the first PUSCH or the last PUSCH transmitted by the user equipment and the PUSCH received by the same COT base station.
In a specific implementation, when the base station configures multiple scheduling-free resources for the ue and the ue is capable of transmitting uplink data by using the multiple scheduling-free resources simultaneously, the base station may indicate which resource is in DCI.
EXAMPLE six
As described below, an embodiment of the present invention provides a user equipment.
And the user equipment supports the unlicensed frequency band of the 5G new air interface. The difference from the prior art is that the user equipment further comprises a data transmission device as provided in the fourth embodiment of the present invention. Therefore, for the data transmission mode of AUL transmission in the 5G new air interface unlicensed frequency band, the base station identifies the user equipment sending uplink data through UE specific DMRS, and sends DCI to the user equipment under the condition that UCI is not decoded successfully, wherein the DCI comprises first information, and the user equipment determines the HARQ-ID needing to be retransmitted through the first information, so that retransmission based on scheduling can be still realized under the condition that UCI is not decoded successfully by the base station, the flexibility of data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
EXAMPLE seven
As described below, embodiments of the present invention provide a base station.
And the base station supports the unlicensed frequency band of the 5G new air interface. The difference from the prior art is that the base station further comprises a data transmission device as provided in the fifth embodiment of the present invention. Therefore, for the data transmission mode of AUL transmission in the 5G new air interface unlicensed frequency band, the base station identifies the user equipment sending uplink data through UE specific DMRS, and under the condition that UCI is not decoded successfully, the base station sends DCI to the user equipment, wherein the DCI comprises first information, and the user equipment determines the HARQ-ID needing retransmission through the first information, so that under the condition that UCI is not decoded successfully by the base station, retransmission based on scheduling can be still realized, the flexibility of data retransmission is improved, and the base station can indicate information such as time-frequency resources and MCS of retransmission in the DCI.
Those skilled in the art will understand that, in the methods of the embodiments, all or part of the steps can be performed by hardware associated with program instructions, and the program can be stored in a computer-readable storage medium, which can include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (22)
1. A method of data transmission, comprising:
in the unlicensed frequency band of the 5G new air interface, the user equipment sends uplink data and associated UCI to the base station in an AUL transmission mode;
the base station identifies the user equipment which sends the uplink data through the UE specific DMRS;
the base station decodes the UCI;
under the condition that UCI cannot be decoded successfully, a base station transmits DCI to the user equipment, wherein the DCI comprises first information;
the user equipment receives the DCI;
the user equipment determines the HARQ-ID needing retransmission through the first information;
the user equipment performs retransmission based on scheduling;
the first information indicates a time difference between the base station sending the uplink scheduling information and the base station receiving the PUSCH, or the first information indicates a time difference between the first PUSCH or the last PUSCH sent by the user equipment and the base station receiving the PUSCH, which is received by one same COT base station.
2. The data transmission method of claim 1, wherein before the sending the uplink data and the associated UCI to the base station by means of AUL transmission, the method further comprises: the concurrent listening is carried out first and then successfully.
3. The data transmission method of claim 1, wherein the UCI includes HARQ-ID, NDI, RVID associated with the uplink data.
4. The data transmission method according to claim 1, wherein the base station indicates which resource is in the DCI when the base station configures the user equipment with a plurality of scheduling-free resources and the user equipment can simultaneously use the plurality of scheduling-free resources to transmit uplink data.
5. A method of data transmission, comprising:
in the unlicensed frequency band of the 5G new air interface, sending uplink data and associated UCI to a base station in an AUL transmission mode, wherein the base station can identify user equipment sending the uplink data through UE specific DMRS;
receiving DCI, wherein the DCI comprises first information;
determining the HARQ-ID needing retransmission through the first information;
performing a scheduling-based retransmission;
the first information indicates a time difference between the base station sending the uplink scheduling information and the base station receiving the PUSCH, or the first information indicates a time difference between the first PUSCH or the last PUSCH sent by the user equipment and the base station receiving the PUSCH, which is received by one same COT base station.
6. The data transmission method of claim 5, wherein before the sending the uplink data and the associated UCI to the base station by means of AUL transmission, the method further comprises: the concurrent listening is carried out first and then successfully.
7. The data transmission method of claim 5, wherein the UCI includes HARQ-ID, NDI, and RVID associated with the uplink data.
8. The data transmission method according to claim 5, wherein the base station indicates which resource is in the DCI when the base station configures a plurality of scheduling-free resources to the user equipment and the user equipment can simultaneously use the plurality of scheduling-free resources to transmit uplink data.
9. A method of data transmission, comprising:
receiving uplink data and associated UCI sent by user equipment in an unlicensed frequency band of a 5G new air interface in an AUL transmission mode;
identifying the user equipment which transmits the uplink data through the UE specific DMRS;
decoding the UCI;
under the condition that UCI cannot be decoded successfully, sending DCI to the user equipment, wherein the DCI comprises first information, and the user equipment can determine HARQ-ID needing retransmission through the first information;
the first information indicates a time difference between the base station sending the uplink scheduling information and the base station receiving the PUSCH, or the first information indicates a time difference between the first PUSCH or the last PUSCH sent by the user equipment and the base station receiving the PUSCH, which is received by one same COT base station.
10. The data transmission method of claim 9, wherein before the sending the uplink data and the associated UCI to the base station by means of AUL transmission, the method further comprises: the concurrent listening is carried out first and then successfully.
11. The data transmission method of claim 9, wherein the UCI includes HARQ-ID, NDI, RVID associated with the uplink data.
12. The data transmission method according to claim 9, wherein the base station indicates which resource is in the DCI when the base station configures the user equipment with a plurality of scheduling-free resources and the user equipment can simultaneously use the plurality of scheduling-free resources to transmit uplink data.
13. A data transmission apparatus, comprising: an uplink data sending unit, a downlink data receiving unit, an analysis unit and an uplink data retransmission unit; wherein:
the uplink data sending unit is suitable for sending uplink data and associated UCI to the base station in an AUL (autonomous Underwater language) transmission mode in an unlicensed frequency band of a 5G new air interface, and the base station can identify user equipment sending the uplink data through a UE specific DMRS (demodulation reference signal);
a downlink data receiving unit, adapted to receive DCI, where the DCI includes first information;
a parsing unit adapted to determine a HARQ-ID requiring retransmission through the first information;
an uplink data retransmission unit adapted to perform scheduling-based retransmission;
the first information indicates a time difference between the base station sending the uplink scheduling information and the base station receiving the PUSCH, or the first information indicates a time difference between the first PUSCH or the last PUSCH sent by the user equipment and the base station receiving the PUSCH, which is received by one same COT base station.
14. The apparatus for data transmission according to claim 13, wherein before the sending uplink data and associated UCI to the base station by AUL transmission, the apparatus further comprises: the concurrent listening is carried out first and then successfully.
15. The data transmission apparatus of claim 13, wherein the UCI includes HARQ-ID, NDI, RVID associated with the uplink data.
16. The data transmission apparatus of claim 13, wherein when the base station configures the user equipment with multiple scheduling-free resources and the user equipment can simultaneously use the multiple scheduling-free resources to transmit uplink data, the base station indicates which resource is in the DCI.
17. A data transmission apparatus, comprising: the device comprises an uplink data receiving unit, an identification unit, a decoding unit and an indication unit; wherein:
the uplink data receiving unit is suitable for receiving uplink data and associated UCI sent by the user equipment in an AUL (autonomous Underwater language) transmission mode in an unlicensed frequency band of a 5G new air interface;
an identification unit adapted to identify a user equipment transmitting the uplink data through a UE specific DMRS;
a decoding unit adapted to decode the UCI;
an indication unit, adapted to send DCI to the user equipment if UCI fails to be decoded successfully, where the DCI includes first information, and the user equipment can determine an HARQ-ID that needs to be retransmitted through the first information;
the first information indicates a time difference between the base station sending the uplink scheduling information and the base station receiving the PUSCH, or the first information indicates a time difference between the first PUSCH or the last PUSCH sent by the user equipment and the base station receiving the PUSCH, which is received by one same COT base station.
18. The apparatus for data transmission according to claim 17, wherein before the sending uplink data and associated UCI to the base station by means of AUL transmission, the apparatus further comprises: the concurrent listening is carried out first and then successfully.
19. The data transmission apparatus of claim 17, wherein the UCI includes HARQ-ID, NDI, RVID associated with the uplink data.
20. The data transmission apparatus of claim 17, wherein when the base station configures the user equipment with multiple scheduling-free resources and the user equipment can simultaneously use the multiple scheduling-free resources to transmit uplink data, the base station indicates which resource is in the DCI.
21. A user equipment, which supports an unlicensed frequency band of a 5G new air interface, and is characterized by comprising the data transmission apparatus according to any one of claims 13 to 16.
22. A base station, which supports an unlicensed frequency band of a 5G new air interface, comprising the data transmission apparatus according to any one of claims 17 to 20.
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| CN114070478B (en) * | 2020-08-07 | 2023-06-30 | 大唐移动通信设备有限公司 | Information transmission method, terminal and network side equipment |
| CN116321492A (en) * | 2020-08-26 | 2023-06-23 | Oppo广东移动通信有限公司 | Method for configuring authorized CG resource, terminal equipment and network equipment |
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| CN108111263B (en) * | 2017-06-16 | 2023-02-07 | 中兴通讯股份有限公司 | Feedback method and device of confirmation information and receiving method and device of confirmation information |
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| CN108024366A (en) * | 2016-11-04 | 2018-05-11 | 北京三星通信技术研究有限公司 | It is a kind of based on exempt from scheduling data transmission method and equipment |
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