CN109478958B

CN109478958B - Data transmission method, equipment and system

Info

Publication number: CN109478958B
Application number: CN201680087336.3A
Authority: CN
Inventors: 鲍坤超; 朱莉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-06-30
Filing date: 2016-06-30
Publication date: 2020-09-18
Anticipated expiration: 2036-06-30
Also published as: WO2018000373A1; CN109478958A

Abstract

The embodiment of the invention provides a data transmission method, equipment and a system, relates to the technical field of communication and aims to solve the problems of resource waste and system performance loss caused by the fact that all HARQ processes are completely used and cannot be scheduled in time when a base station receives an HARQ feedback message in the prior art. The method comprises the following steps: and if the base station receives the HARQ feedback message and all the HARQ processes supported by the base station are used, the base station sends the data packet to the UE through a second transmission block of the first HARQ process according to the HARQ feedback message.

Description

Data transmission method, equipment and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, device, and system.

Background

A Long Term Evolution (LTE) network supports a hybrid automatic Repeat Request (HARQ) function, and in an LTE TDD (Time Division Duplex) system, N-channel parallel HARQ processes are generally used to transmit and retransmit a transport block between peer entities in a physical layer or a Media Access Control (MAC) layer, so as to improve throughput while ensuring reliability of successful transmission of the transport block.

In the LTE TDD system, the number of downlink HARQ processes supported by different uplink and downlink allocations is different, for example: the number of downlink HARQ processes (the number of usable HARQ processes) supported by the uplink/downlink configuration mode 0 is 4, and the number of downlink HARQ processes supported by the uplink/downlink configuration mode 2 is 10. For each HARQ process, the base station notifies the scheduling Information related to the HARQ process to a User Equipment (UE) through Downlink Control Information (DCI), and sends a data packet to the UE through a scheduling manner corresponding to the HARQ process (e.g., dual-codeword scheduling or single-codeword scheduling), and the UE performs corresponding processing on the received data packet sent by the base station according to the scheduling Information related to the HARQ process in the DCI and sends an HARQ feedback message to the base station according to a processing result, where the HARQ feedback message includes: a Negative Acknowledgement (NACK) message or an Acknowledgement (ACK) message, so that the base station performs new packet transmission through an available HARQ process (i.e., unused at the current time) after receiving the HARQ feedback message, or performs retransmission processing by using the same HARQ process as before.

However, in practical application, due to the limitation of the HARQ feedback timing sequence, when the base station receives the HARQ feedback message sent by the UE, all HARQ processes are used up, the HARQ process cannot be scheduled to transmit the data packet in time, and the released HARQ process can be scheduled to newly transmit the data packet only when the HARQ process is released at the next time, which seriously affects the network system performance and the user experience rate.

For example: fig. 1 is a timing diagram of HARQ scheduling in an uplink/downlink configuration mode 2, where the number of HARQ processes available in the uplink/downlink configuration mode 2 is 10, and at this time, as shown in fig. 1, a radio frame #0 subframe #9, a radio frame #1 subframe #0, a radio frame #1 subframe #1, and a radio frame #1 subframe #3 use 4 HARQ processes, and a ue reports HARQ feedback results of the 4 frames in a radio frame #1 subframe # 7. However, due to air interface delay, L1 processing delay, inter-board transmission delay, etc., the base station may not receive the HARQ feedback result until subframe #1 of radio frame #2 (in the figure, the HARQ feedback result of the 4 frames is represented by NACK 1). The radio frame #1 subframe #4, the radio frame #1 subframe #5, the radio frame #1 subframe #6, and the radio frame #1 subframe #8 use another 4 HARQ processes, and the ue reports HARQ feedback results of the 4 frames in the radio frame #2 subframe # 2. But the bs side L2 may not receive the HARQ feedback result until the subframe #6 of the radio frame #2 (the HARQ feedback result for the 4 frames is indicated by NACK 2). Until the radio frame #1

subframe #

9, 8 HARQ processes have been used, the radio frame #1 subframe #9 uses the ninth HARQ process, and the radio frame #2 subframe #0 uses the tenth HARQ process, so that all 10 available HARQ processes are used up, and the HARQ feedback result of the HARQ process of the previously scheduled subframe is not returned yet, which may cause the radio frame #2 subframe #1 to be unable to be scheduled because 10 HARQ processes are all used, resulting in resource waste and system performance loss.

Disclosure of Invention

The embodiment of the invention provides a data transmission method, equipment and a system, which aim to solve the problems of resource waste and system performance loss caused by that when a base station receives an HARQ feedback message, an HARQ process is used up and cannot be scheduled in time.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides a data transmission method, where the method is performed by a base station, and the method may include:

sending a data packet to User Equipment (UE) through a first transmission block of a first hybrid automatic repeat request (HARQ) process;

when the base station receives the HARQ feedback message returned by the UE, if all the HARQ processes supported by the base station are used, the base station sends a data packet to the UE through the second transmission block of the first HARQ process according to the HARQ feedback message.

For example, if the maximum supportable number of HARQ processes by the base station is M, the M HARQ processes use M different HARQ process numbers in a one-to-one correspondence, and when the base station receives the HARQ feedback message, if all the M HARQ processes identified by the HARQ process numbers are used, the base station sends a data packet to the UE through the second transport block in the first HARQ.

The method includes that a data packet is sent through different transmission blocks in the HARQ process, namely, one HARQ process is identified by using the HARQ process number and the different transmission blocks in the HARQ process, and the HARQ process which is originally identified by using the HARQ process number is divided into a plurality of HARQ processes so as to expand the used HARQ processes.

Optionally, in an implementation manner of the first aspect, the base station may indicate scheduling information related to the HARQ process through a downlink control message DCI, so that the UE determines, according to the scheduling information, which transport block in the HARQ process the data packet is sent at this time, and what the modulation and coding scheme, the redundancy version information, and the new data indication used by the transport block are, specifically implemented as follows:

before a base station sends a data packet to a UE through a first transmission block of a first HARQ process, sending Downlink Control Information (DCI) to the UE, wherein the DCI comprises: the method comprises the steps that the process number of a first HARQ process, the identification information of a first transmission block of the first HARQ process and the first scheduling information of the first HARQ process of the control information of the first transmission block of the first HARQ process are used, so that the UE receives a data packet from the first transmission block of the first HARQ process according to the first scheduling information and determines the condition of the received data packet; the control information for the first transport block of the first HARQ process comprises: scheduling coding scheme, redundancy version number and new packet indication information.

Similarly, before the base station sends the data packet to the UE through the second transport block of the first HARQ process, the sending, to the UE through the DCI, includes: the process number of the first HARQ process, the identification information of the second transmission block of the first HARQ process and the second scheduling information of the first HARQ process of the control information of the second transmission block of the first HARQ process, so that the UE receives a data packet from the second transmission block of the first HARQ process according to the second scheduling information and determines the condition of the received data packet; the control information of the second transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

Thus, the scheduling message related to the HARQ process can be sent to the UE in advance, so that the UE can know which transport block of which HARQ process the base station sends the data packet, so that the UE receives the data packet and demodulates the data packet.

Optionally, in another implementation manner of the first aspect, when the base station sends a data packet to the UE through the first transport block of the first HARQ process, the second transport block of the first HARQ process is not used, which is specifically embodied as: the first scheduling information does not include the control information of the second transport block, or the first scheduling information includes the control information of the second transport block, and the control information of the second transport block is used to indicate: the second transport block is not used for transmitting data packets.

Similarly, when the base station sends the second scheduling information to the UE through the downlink control information DCI, the second scheduling information does not include the control information of the first transport block, or the second scheduling information includes the control information of the first transport block, but the control information of the first transport block is used to indicate: the first transport block is not used for transmitting data packets.

Specifically, the scheduling information of a single transport block may be respectively indicated by DCI formats 2/2a/2B/2C/2D used to indicate dual codeword scheduling information.

In a second aspect, an embodiment of the present invention provides a data transmission method, which is performed by a user equipment UE, and the method may include:

receiving a data packet of a first transmission block which is transmitted by a base station and passes through a first HARQ process;

determining the condition of a received data packet sent by the base station through the first transmission block of the first HARQ process, and returning an HARQ feedback message to the base station;

and if the HARQ processes supported by the base station are all used when the base station receives the HARQ feedback message, the UE receives the HARQ feedback message and sends a data packet to the UE through the second transmission block of the first HARQ process.

Therefore, when the base station receives the HARQ feedback message and all HARQ processes are used, the data packet can be sent in time through another transmission block in the HARQ process, so that the data packet can be scheduled in time, and the problems of resource waste and overall performance loss are avoided.

In an implementation manner of the second aspect, before the UE receives a data packet of a first transport block that is sent by the base station and passes through a first HARQ process, the receiving base station sends to the UE through downlink control information DCI, where the receiving base station includes: the process number of the first HARQ process, the identification information of the first transmission block of the first HARQ process and the first scheduling information of the first HARQ process of the control information of the first transmission block of the first HARQ process; the control information for the first transport block of the first HARQ process comprises: scheduling coding scheme, redundancy version number and new packet indication information.

Accordingly, the UE may receive a data packet from the first transport block of the first HARQ process according to the first scheduling information, and determine a condition of the received data packet.

Also, in another implementation manner of the second aspect, before the UE receives the data packet of the second transport block transmitted by the base station through the first HARQ process, the receiving base station transmits to the UE through the downlink control information DCI, the receiving base station includes: the process number of the first HARQ process, the identification information of the second transmission block of the first HARQ process and the second scheduling information of the first HARQ process of the control information of the second transmission block of the first HARQ process; the control information of the second transport block of the first HARQ process comprises: scheduling coding scheme, redundancy version number and new packet indication information.

Accordingly, the UE may receive a data packet from the second transport block of the first HARQ process according to the second scheduling information, and determine a condition of the received data packet.

In this way, the UE may receive and demodulate a data packet from a corresponding transport block according to the scheduling information related to the HARQ process indicated in the DCI.

In a third aspect, an embodiment of the present invention provides a base station, configured to perform the method in the first aspect, where the base station may include:

a sending unit, configured to send a data packet to a user equipment UE through a first transport block of a first HARQ process;

a receiving unit, configured to receive a HARQ feedback message returned by the UE, where the HARQ feedback message is used to: feeding back the condition of the data packet received by the UE and sent by the base station through the first transport block of the first HARQ process;

the sending unit is further configured to send a data packet to the UE through the second transport block of the first HARQ process according to the HARQ feedback message if all HARQ processes supported by the base station are used when the receiving unit receives the HARQ feedback message.

Therefore, when the receiving unit receives the HARQ feedback message and all HARQ processes are used, the data packet can be sent to the UE in time through another transmission block in the HARQ process, so that the data packet can be scheduled in time, and the problems of resource waste and overall performance loss are avoided.

The specific implementation processes of the sending unit and the receiving unit may refer to the implementation processes in the method of the first aspect, and are not described in detail herein.

It should be noted that the receiving unit and the receiving unit described in the third aspect may be integrated as a transceiver in a base station.

In a fourth aspect, an embodiment of the present invention provides a user equipment UE, configured to execute the method in the second aspect, where the user equipment UE may include:

a receiving unit, configured to receive a data packet of a first transport block in a first HARQ process sent by a base station;

a processing unit, configured to determine a condition of the data packet received by the receiving unit and sent by the base station through the first transport block of the first HARQ process;

a sending unit, configured to return an HARQ feedback message to the base station, where the HARQ feedback message is used to: feeding back the condition of the data packet received by the receiving unit determined by the processing unit;

the receiving unit is further configured to receive, if the HARQ processes supported by the base station are all used when the base station receives the HARQ feedback message, that the base station sends a data packet to the UE through the second transport block of the first HARQ process according to the HARQ feedback message.

Therefore, the sending data packet sent by the base station through another transmission block in the HARQ process can be received under the condition that all the HARQ processes are used after the UE feeds back the HARQ feedback message to the base station, and the data packet is scheduled in time, so that the problems of resource waste and overall performance loss are avoided.

The specific execution processes of the receiving unit, the processing unit, and the sending unit may refer to corresponding execution processes in the method of the second aspect, and are not described in detail herein.

The receiving unit and the transmitting unit in the fourth aspect may be transceivers in user equipment, the processing unit in the fourth aspect may be a processor that is separately installed, or may be implemented by being integrated in a certain processor of the user equipment, or may be stored in a memory of the user equipment in the form of program codes, and the certain processor of the user equipment invokes and executes the functions of the processing unit. The processor described herein may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

In a fifth aspect, an embodiment of the present invention further provides a data transmission system, including the base station according to the third aspect, and at least one user equipment according to the fourth aspect.

It can be seen from the above that, embodiments of the present invention provide a data transmission method, device, and system, where a base station sends a data packet to a user equipment UE through a first transport block of a first HARQ process, and receives a HARQ feedback message returned by the UE, and if the base station receives the HARQ feedback message and all HARQ processes supported by the base station are used, the base station sends the data packet to the UE through a second transport block of the first HARQ process according to the HARQ feedback message. Therefore, the data packet can be sent in time through another unused transmission block in the HARQ process, the HARQ process is identified by the HARQ process number and different transmission blocks in the HARQ process, the original HARQ which is only identified by the HARQ process number is divided into a plurality of HARQ processes through the difference of the transmission blocks, the number of the HARQ processes is enlarged, and the problems of resource waste and overall performance loss caused by the fact that all the HARQ processes are used when the base station receives the HARQ feedback message are solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a timing diagram of HARQ scheduling in an uplink-downlink configuration mode 2;

FIG. 2 is a schematic diagram of a network architecture according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention;

fig. 4 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 5 is a structural diagram of a base station according to an embodiment of the present invention;

fig. 6 is a structural diagram of a user equipment according to an embodiment of the present invention;

fig. 7 is a structural diagram of another data transmission system according to an embodiment of the present invention.

Detailed Description

The basic principle of the invention is as follows: aiming at the problems that when a base station receives an HARQ feedback message, HARQ processes supported by the base station are all used, so that the HARQ processes are insufficient, and the base station cannot perform HARQ scheduling in time, the HARQ process number is not used for uniquely identifying one HARQ process, but the HARQ process number and additional information (such as transport block information) are used for identifying the HARQ process, namely for the HARQ process, different HARQ processes can be identified by adopting the HARQ process number and different transport block information, different transport blocks in the HARQ process are used for sending data packets, and one HARQ identified by the HARQ process number is divided into a plurality of HARQ processes through different transport blocks, so that the used HARQ processes are expanded.

For example, for HARQ process 1, HARQ process 1 and transport block 2 may be used to identify two different HARQ processes, and the transport block 1 of HARQ process 1 is used to transmit a data packet, or the transport block 2 of HARQ process 1 is used to transmit a data packet, and one HARQ process is added to two HARQ processes according to the difference of transport blocks, so as to increase the number of HARQ processes.

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 2 is a schematic diagram of a network architecture provided in an embodiment of the present invention, where the network may be suitable for the data transmission method provided in the embodiment, and the network may be: the LTE TDD network may also be a time Division-Synchronous Code Division Multiple Access (TD-SCDMA) network supporting time Division synchronization. As shown in fig. 2, the network architecture may include: the Base Station 10 may be a Base Transceiver Station (BTS) in a TD-SCDMA network, or an evolved Node B (eNB) or e-NodeB in LTE, and the present invention is not limited thereto. The user equipment 20 may be: the user uniqupdate, UE, may also be: user equipment (Terminal), a Mobile Station (MS), Mobile user equipment (Mobile Terminal), etc., the present invention is not limited thereto, and the user equipment 20 may communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment 20 may be a Mobile phone, a computer with Mobile user equipment, etc., or may be a portable, pocket, handheld, computer-embedded or vehicle-mounted Mobile device.

Specifically, the base station 10 may send the data packet to the user equipment 20 through dual codeword scheduling (corresponding to two Transport Blocks (TBs)) of the HARQ process, or may send the data packet to the user equipment 20 through single codeword scheduling of the HARQ process, and accordingly, the user equipment 20 may have a dual codeword demodulation function or a single codeword demodulation function.

To implement HARQ-based communication, as shown in fig. 3, the base station 10 may include: a transceiver 1011, a processor 1012, a memory 1013, and at least one communication bus 1014 for enabling connection and intercommunication among these devices; the user equipment 20 may include: a transceiver 2011, a processor 2012, a memory 2013, and at least one communication bus 2014 for enabling connection and communication between the devices;

the transceiver 1011 and the transceiver 2011 may be implemented by antennas, and may be used for performing data interaction with an external network element, for example: the transceiver 1011 of the base station 10 can transceive data packets with the user equipment 20; the transceiver 2011 of the UE 20 may transceive data packets with the UE or the base station 10.

Processor 1012, processor 2012, which may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention. For example: one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

Memory 1013, memory 2013, which may be a volatile memory (RAM), such as a random-access memory (RAM); or a non-volatile memory (non-volatile memory). Such as read-only memory (ROM), flash memory (flash memory), hard disk (HDD), or solid-state drive (SSD); or a combination of the above types of memories.

The communication bus 1014 and the communication bus 2014 may be divided into an address bus, a data bus, a control bus, and the like, and may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, or the like. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.

Specifically, the processor 1012 in the base station 10 may be configured to: carrying the data packet on the first transport block in the first HARQ process, and sending the data packet by the transceiver 1011 to the transceiver 2011 of the user equipment 20; the first HARQ process may be any one of HARQ processes supported by the base station.

Processor 2012 may be configured to: after the transceiver 2011 receives the data packet, it determines the situation of the data packet, and returns HARQ feedback information for feeding back the situation of the data packet to the transceiver 1011 through the transceiver 2011.

If all HARQ processes supported by the base station are used when the transceiver 1011 receives the HARQ feedback information, the processor 1012 may further be configured to: the data packet is carried in the second transport block of the first HARQ process and is sent again by the transceiver 1011 to the transceiver.

Therefore, when the base station receives the HARQ feedback message and all HARQ processes are used, the data packet can be sent in time through another unused transmission block in the HARQ processes, so that the data packet can be scheduled in time, and the problems of resource waste and overall performance loss are avoided.

Optionally, before the transceiver 1011 sends the data packet to the transceiver 2011, the transceiver 1011 needs to send scheduling information of the first HARQ process to the transceiver 2011, so that the processor 2012 determines, according to the scheduling information, which transport block in the first HARQ process the data packet is sent in this time, and what the modulation and coding scheme, the redundancy version information, and the new data indication are used by the transport block. Specifically, before the processor 1012 carries the data packet in the first transport block of the first HARQ process, and sends the data packet to the transceiver 2011 through the transceiver 1011, the processor 1012 may further be configured to:

encapsulating first scheduling information of the first HARQ process in Downlink Control Information (DCI), and transmitting the first scheduling information to the transceiver 2011 by the transceiver 1011; the first scheduling information includes: the process number of the first HARQ process, the identification information of the first transport block of the first HARQ process, and the control information of the first transport block of the first HARQ process, the control information of the first transport block of the first HARQ process including: scheduling a coding scheme, a redundancy version number and new data packet indication information;

the processor 2012 may also be configured to: and receiving a data packet from a first transmission block of the first HARQ process according to the first scheduling information, and determining the condition of the received data packet according to the control information of the first transmission block.

Wherein, the identification information of the first transmission block of the first HARQ process is used for identifying the first transmission block of the first HARQ process.

Optionally, after the transceiver 1011 receives the HARQ feedback information, before the processor 1012 carries the data packet in the second transport block of the first HARQ process, and the transceiver 1011 sends the data packet to the transceiver 2011 again, the processor 1012 may further be configured to:

encapsulating the second scheduling information of the first HARQ process in DCI, and transmitting the second scheduling information to the transceiver 2011 by the transceiver 1011; the second scheduling information includes: the process number of the first HARQ process, the identification information of the second transport block of the first HARQ process, and the control information of the second transport block of the first HARQ process, the control information of the second transport block of the first HARQ process including: scheduling a coding scheme, a redundancy version number and new data packet indication information;

the processor 2012 may also be configured to: and receiving a data packet from a second transmission block of the first HARQ process according to the second scheduling information, and determining the condition of the received data packet according to the control information of the second transmission block.

Wherein, the identification information of the second transmission block of the first HARQ process is used for identifying the second transmission block of the first HARQ process.

For convenience of description, the following embodiments illustrate and describe in detail the processes of the data transmission method in the form of steps, wherein the illustrated steps can also be executed in a computer system executing a set of instructions. Further, while a logical order is shown in the figures, in some cases, the steps shown or described may be performed in an order different than here.

Fig. 4 is a flowchart of a data transmission method provided by an embodiment of the present invention, which is executed by the base station 10 and the user equipment 20 shown in fig. 2 interactively; as shown in fig. 4, the method may include the steps of:

s101: and the base station sends the data packet to the user equipment through the first transmission block of the first HARQ process.

The number of downlink HARQ processes supported by the base station may be M, where M is an integer not less than 1.

Optionally, the number M of downlink HARQ processes supported by the base station may be different according to the difference between the uplink and downlink ratios between the base station and the user equipment, and each HARQ process may correspond to a Transmission Time Interval (TTI). Specifically, table 1 shows the number of downlink HARQ processes specified by the 36.213 protocol:

TABLE 1

Uplink and downlink ratio	Number of downlink HARQ processes
		0	4
1	7
		2	10
3	9
		4	12
5	15
		6	6

The M HARQ processes may include a single-codeword scheduled HARQ process and a dual-codeword scheduled HARQ process, the first HARQ process may be any one of the M HARQ processes, and the first transport block may be any one of transport blocks supported by the first HARQ process.

It should be noted that, the HARQ process scheduled by a single codeword may refer to: the HARQ process for transmitting a data packet to the ue through only one transport block, and the dual-codeword scheduled HARQ process may refer to: the invention also discloses a method for transmitting data packets to User Equipment (UE) by using two transmission blocks, which comprises the following steps that the HARQ process transmits the data packets to the UE by using two transmission blocks, and the HARQ process supports double-code word scheduling at most in the current communication network.

S102: the user equipment receives a data packet sent by the base station through the first transmission block of the first HARQ process, and returns an HARQ feedback message to the base station according to the condition of the received data packet; the HARQ feedback message is used to: and feeding back the condition of the data packet received by the user equipment and sent by the base station through the first transport block of the first HARQ process.

Wherein, the HARQ feedback message may be: an Acknowledgement (ACK) message, or a Negative Acknowledgement (NACK). Optionally, when the data packet received by the user equipment is correct, the HARQ feedback message is an ACK message, and when the data packet received by the user equipment is incorrect, the HARQ feedback message is a NACK message.

Specifically, the ue may receive a data packet on a transport block of a corresponding HARQ process according to a scheduling message of the HARQ process, demodulate the received data packet according to related information in the scheduling message, and determine whether the demodulated data packet is correct or incorrect, where the scheduling message of the HARQ process may be sent to the ue through a Downlink Control information DCI in a Physical Downlink Control Channel (PDCCH) by the base station, where the Downlink Control information DCI is, for example: before the base station transmits the data packet to the UE through the first transport block of the first HARQ process, the method may further include:

the base station sends first scheduling information of a first HARQ process to the UE through the DCI, wherein the first scheduling information comprises: a process number (HARQ process number) of the first HARQ process, identification information of a first transport block of the first HARQ process, and control information of the first transport block of the first HARQ process, the control information of the first transport block of the first HARQ process including: a Modulation and Coding Scheme (MCS), a Redundancy version number (RV), and New Data Indicator (NDI) information;

accordingly, in step S102, the ue may receive a data packet from a first transport block of a first HARQ process according to the first scheduling information, and determine a situation of the data packet according to control information corresponding to the first transport block.

The HARQ process number, which may also be referred to as HARQ process Identification (ID), is used to uniquely specify one HARQ process without distinguishing codewords.

The identification information of the first transport block of the first HARQ process may be used to identify the first transport block of the first HARQ process.

The NDI value may be represented by 1 bit, which is not limited in the present invention, and is used to indicate whether scheduled data is newly transmitted or retransmitted, where if the NDI value of the same HARQ process is changed from the previous value, it indicates that the current transmission is the initial transmission of a new transport block, otherwise, it indicates that the current transmission is the retransmission of the same transport block.

RV: the redundancy version used by the transmission block is indicated, and the value range of the redundancy version is 0-3.

MCS: and indicating the modulation coding scheme used by the current transmission block by using a 5-bit MCS index (corresponding to a value range of 0-31), and determining the size of the transmission block transmitted at this time together with the number of the resource blocks.

It should be noted that the first scheduling information does not include control information of the second transport block, or the first scheduling information includes control information of the second transport block, and the control information of the second transport block is used to instruct: the second transport block is not used for transmitting data packets, so that the UE receives the data packets directly from the first transport block of the first HARQ process after receiving the first control information.

Optionally, the base station may write the scheduling information of the HARQ process into corresponding fields of the DCI according to different DCI formats, for example, table 2 below shows fields related to the HARQ process in different DCI formats:

TABLE 2

Wherein Yes in table 2 indicates that the scheduling information of the HARQ process exists in the DCI under the DCI format, No indicates that the information does not exist in the DCI under the DCI format, as can be seen from fig. 2, except for writing the HARQ process number in the DCI format, the DCI 1/1a/1B/1D can write the control information of the 1 st transport block corresponding to the HARQ process, that is, the DCI 1/1a/1B/1D can be used to transmit the control information of the 1 st TB in the single-codeword scheduling, the DCI format 1C does not support the HARQ process, the DCI 2/2A/2B/2C/2D can write the control information of the 1 st TB and the 2 nd TB corresponding to the HARQ process, that is, 2/2A/2B/2C/2D is used to transmit the control information of the 1 st TB and the 2 nd TB in the dual-codeword scheduling, in practical application, if the MCS of a TB in the DCI 2/2a/2B/2C/2D is 0 and the RV is 1, it indicates that the TB is disabled, where the TB is disabled: the TB is not currently used for transmitting data packets, so that single codeword scheduling can be implemented by disabling a certain TB in DCI 2/2a/2B/2C/2D, such as: the 2 nd TB may be disabled and only the control information of the 1 st TB may be transmitted, or the 1 st TB may be disabled and only the control information of the 2 nd TB may be transmitted.

Optionally, the determining, by the user equipment, the condition of the data packet according to the control information corresponding to the first transport block may include:

the user equipment determines whether the data packet is transmitted initially or retransmitted according to the new data indication information;

if the data packet is determined to be initially transmitted, demodulating the data packet according to an adjusting coding scheme in the control information by using a redundancy bit corresponding to a redundancy version number, determining whether the data packet is correct or wrong according to a demodulation result, if so, sending the data packet to a high layer, and if not, putting the data packet into a soft buffer area (soft buffer) corresponding to a first transmission block of a first HARQ process;

if the data packet is determined to be retransmitted, demodulating the data packet according to an encoding adjustment scheme in the control information by using redundant bits corresponding to a redundant version number, performing soft combining on the demodulated data and data in a soft buffer area corresponding to a first transmission block of the first HARQ process, and determining whether the data packet is correct or wrong according to a combined result.

The soft buffer may be a region corresponding to each HARQ process, which is pre-divided by the user equipment, and is used to store the data packet sent by the HARQ process in the region corresponding to the HARQ process. For example, if the base station supports 10 HARQ processes at maximum, each HARQ process supports single codeword scheduling, and when single codeword scheduling is performed, any TB of dual TBs may be selected to transmit a data packet, so that the 10 HARQ processes may be extended to 20 HARQ processes according to different transport blocks, and 20 soft buffers need to be partitioned on the user equipment side to correspond to the 20 HARQ processes.

S103: and the base station receives the HARQ feedback message, and if the HARQ processes supported by the base station are all used when the base station receives the HARQ feedback message, the base station sends a data packet to the user equipment through the second transmission block of the first HARQ process according to the HARQ feedback message.

Optionally, if the HARQ feedback message is a NACK message, the base station may retransmit the data packet to the user equipment through the second transport block of the first HARQ process;

if the HARQ feedback message is an ACK message, the base station may newly transmit a data packet to the user equipment through the second transport block of the first HARQ process, that is, newly transmit a new data packet.

It can be understood that, in step S103 of the embodiment of the present invention, the first transport block (i.e. the unused transport block) of the first HARQ process is used to send the data packet to the user equipment, and besides, the base station may also use the unused transport block in other HARQ processes to transmit the data packet.

Therefore, the data packets can be sent in time through other unused transmission blocks in the HARQ process so as to enlarge the number of the original HARQ processes and avoid the problems of resource waste and overall performance loss under the condition that all the HARQ processes are used when the base station receives the HARQ feedback message.

The following maximum 10 HARQ processes are supported by the base station: 0-9 HARQ, each HARQ process is single codeword scheduling, each HARQ process supports at most double codeword scheduling, and downlink DCI indicates single codeword scheduling information by using any one of DCI formats 2/2a/2B/2C/2D shown in table 2 that can be used to indicate double codeword scheduling information, for example:

on the base station side, 0-9 HARQ process numbers and transport block 1(TB1) may be used to indicate 10 HARQ processes for single codeword scheduling, and 0-9 HARQ process numbers and transport block 2(TB2) may be used to indicate the other 10 HARQ processes for single codeword scheduling.

The base station preferentially adopts 0-9 HARQ process numbers and TB1 to indicate the scheduling information of the HARQ process scheduled by the single code word, and the field content can be as follows:

HARQ process number-4bits (value range 0 ~ 9)

for transport block 1：

Modulation and coding scheme-5bits (value range 0 ~ 31)

Redundacy version-2bits (0/2/3/1 or 0/3/2/1 in order according to the retransmission times)

for transport block 2：

Modulation and coding scheme-5bits (value is 0)

Redundacy version-2bits (value 1)

The above fields indicate that TB1 is used to transmit packets and TB2 is not used to transmit packets in the current single codeword schedule.

After the 10 HARQ processes indicated by the HARQ process numbers 0 to 9 and the TB1 are used up, the HARQ process numbers 0 to 9 and the TB2 are used to indicate another 10 HARQ processes with single codeword scheduling, and the field contents related to the scheduling information may be as follows:

HARQ process number-4bits (value range 0 ~ 9)

for transport block 1：

Modulation and coding scheme-5bits (value is 0)

Redundacy version-2bits (value 1)

for transport block 2：

Modulation and coding scheme-5bits (value range 0 ~ 31)

The above fields indicate that TB2 is used to transmit packets and TB1 is not used to transmit packets in the current single codeword schedule.

On the terminal side, after the scheduling information that TB1 is used to transmit data packets but TB2 is not used to transmit data packets is read, the received data is stored into the first 10 soft buffers corresponding to the HARQ process according to the HARQ process number in the scheduling information, for example: and storing the data with the HARQ process number of 0 into a soft buffer with the number of 0, storing the data with the HARQ process number of 1 into a soft buffer with the number of 1, and sequentially pushing the data until the data with the HARQ process number of 9 is stored into a soft buffer with the number of 9.

When it is read that TB1 is not used to transmit a data packet and TB2 is used to transmit scheduling information of the data packet, the received data is stored into the corresponding last 10 soft buffers according to the HARQ process number in the scheduling information, for example: and storing the data with the HARQ process number of 0 into a soft buffer number 10, storing the data with the HARQ process number of 1 into a soft buffer number 11, and sequentially pushing the data until the data with the HARQ process number of 9 is stored into a soft buffer number 19.

If the demodulation is correct, the terminal side feeds back ACK and transmits the data corresponding to the soft buffer to the high layer; if the base station side receives the ACK, the next newly transmitted data can be scheduled by using the same HARQ process number and TB scheduling information. If the demodulation fails, feeding back NACK, and combining the NACK with the data in the soft buffer after the retransmission at the base station side arrives to obtain retransmission combination gain; and the same HARQ process number and TB scheduling information are used when the base station side retransmits.

It is understood that different from the above example, the base station may preferentially adopt 0 to 9HARQ process numbers and TB2 to indicate 10 HARQ processes, and after all 10 HARQ processes are used, adopt 0 to 9HARQ process numbers and TB1 to indicate the other 10 HARQ processes, where the scheduling process of the transport block of each HARQ process is the same as that described above, and is not described in detail herein.

It can be seen from the above that, in the data transmission method provided in the embodiments of the present invention, the base station sends the data packet to the UE through the first transport block of the first HARQ process, and receives the HARQ feedback message returned by the UE, and if the base station receives the HARQ feedback message and all the M HARQ processes supported by the base station are used, the base station sends the data packet to the UE through the second transport block of the first HARQ process according to the HARQ feedback message. Therefore, the data packet can be sent in time through another unused transmission block in the HARQ process so as to enlarge the number of the original HARQ processes and avoid the problems of resource waste and overall performance loss caused by the use of all the HARQ processes when the base station receives the HARQ feedback message.

The following embodiments of the present invention further provide a base station, and preferably, the base station is configured to implement the process executed by the base station in the foregoing method.

Fig. 5 is a structural diagram of a base station 30 according to an embodiment of the present invention, and as shown in fig. 5, the base station 30 may include:

a sending unit 301, configured to send a data packet to a user equipment UE through a first transport block of a first HARQ process.

A receiving unit 302, configured to receive a HARQ feedback message returned by the UE, where the HARQ feedback message is used to: and feeding back the condition of the data packet received by the UE and sent by the base station through the first transport block of the first HARQ process.

The sending unit 301 is further configured to send a data packet to the UE through the second transport block of the first HARQ process according to the HARQ feedback message if all HARQ processes supported by the base station are used when the receiving unit 302 receives the HARQ feedback message.

Optionally, before the sending unit 301 sends the data packet to the UE through the first transport block of the first HARQ process, the sending unit 301 may also send first scheduling information of the first HARQ process to the UE through downlink control information DCI, so that the UE knows from which transport block of the first HARQ process the data packet is sent, and receives the data packet from the corresponding transport block of the first HARQ process according to the first scheduling information, and determines a condition of the received data packet.

Wherein the first scheduling information may include: the process number of the first HARQ process, the identification information of the first transport block of the first HARQ process, and the control information of the first transport block of the first HARQ process, where the control information of the first transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

Also optionally, before the sending unit 301 sends the data packet to the UE through the second transport block of the first HARQ process, the sending unit 301 also needs to send the second scheduling information of the first HARQ process to the UE through DCI, so that the UE receives the data packet from the transport block indicated by the second scheduling information according to the second scheduling information, and determines the condition of the received data packet.

Wherein the second scheduling information may include: the process number of the first HARQ process, the identification information of the second transport block of the first HARQ process, and the control information of the second transport block of the first HARQ process, where the control information of the second transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

It is to be understood that the second scheduling information does not include the control information of the first transport block, or the second scheduling information includes the control information of the first transport block, but the control information of the first transport block is used to indicate: the first transport block is not used for transmitting the data block, so that the UE receives the data packet directly from the second transport block of the first HARQ process after receiving the second control information.

It should be noted that the receiving unit 302 and the transmitting unit 301 in the base station 30 shown in fig. 5 may be integrated into the transceiver 1011 in the base station 10 shown in fig. 3.

As can be seen from the above, an embodiment of the present invention provides a base station, which sends a data packet to a UE through a first transport block of a first HARQ process, and receives a HARQ feedback message returned by the UE, and if the HARQ feedback message is received and all HARQ processes supported by the base station are used, sends the data packet to the UE through a second transport block of the first HARQ process according to the HARQ feedback message. Therefore, the data packet can be sent in time through another unused transmission block in the HARQ process so as to enlarge the number of the original HARQ processes and avoid the problems of resource waste and overall performance loss caused by the use of all the HARQ processes when the base station receives the HARQ feedback message.

The following embodiment of the present invention further provides a UE, and preferably, the UE is configured to implement a process executed by the UE in the method step.

Fig. 6 is a structural diagram of a user equipment 40 according to an embodiment of the present invention, and as shown in fig. 6, the user equipment 40 may include:

a receiving unit 401, configured to receive a data packet sent by a base station through a first transport block of a first HARQ process.

A processing unit 402, configured to determine a condition of the data packet received by the receiving unit 401 and sent by the base station through the first transport block of the first HARQ process.

A sending unit 403, configured to return an HARQ feedback message to the base station, where the HARQ feedback message is used to: feeding back the data packet received by the receiving unit 401 determined by the processing unit 402.

The receiving unit 401 is further configured to receive, if the HARQ processes supported by the base station are all used when the base station receives the HARQ feedback message, a data packet sent by the base station to the UE through the second transport block of the first HARQ process according to the HARQ feedback message.

Optionally, before the receiving unit 401 receives the data packet sent by the base station through the first transport block of the first HARQ process, the receiving unit 401 may further be configured to:

receiving first scheduling information of the first HARQ process sent by the base station through Downlink Control Information (DCI); the first scheduling information includes: the process number of the first HARQ process, the identification information of the first transport block of the first HARQ process, and the control information of the first transport block of the first HARQ process, where the control information of the first transport block of the first HARQ process includes: scheduling a coding scheme, a redundancy version number and new data packet indication information;

the processing unit 402 is specifically configured to: and receiving a data packet from a first transmission block of the first HARQ process according to the first scheduling information, and determining the condition of the received data packet.

Optionally, before the receiving unit 401 receives the data packet sent by the base station to the UE through the second transport block of the first HARQ process, the receiving unit 401 may be further configured to:

receiving second scheduling information of the first HARQ process, which is sent to the UE by the base station through DCI, where the second scheduling information includes: the process number of the first HARQ process, the identification information of the second transport block of the first HARQ process, and the control information of the second transport block of the first HARQ process, where the control information of the second transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

It should be noted that the receiving unit 401 and the sending unit 403 in the user equipment 40 in fig. 6 may be the transceiver 2011 in the user equipment 20 shown in fig. 2, the processing unit 402 may be the independent processor 2012 in fig. 2, or may be integrated into one of the processors 2012 in the user equipment 20 for implementation, or may be stored in the memory 2013 of the user equipment 20 in the form of program codes, and the functions of the processing unit 402 may be called and executed by one of the processors 2012 in the user equipment 20. The processor described herein may be a CPU, or an ASIC, or one or more integrated circuits configured to implement embodiments of the present invention.

As can be seen from the above, in the UE provided in the embodiments of the present invention, the receiving base station sends the data packet to the UE through the first transport block of the first HARQ process, and sends the HARQ feedback message back to the base station, and if the HARQ processes supported by the base station are all used when the base station receives the HARQ feedback message, the UE receives the HARQ feedback message, and sends the data packet to the UE through the second transport block of the first HARQ process. Therefore, the data packet can be sent in time through another unoccupied transmission block in the HARQ process so as to enlarge the number of the original HARQ processes, and the problems of resource waste and overall performance loss caused by the fact that all the HARQ processes are used when the base station receives the HARQ feedback message are avoided.

Fig. 7 is a structural diagram of a data transmission system according to an embodiment of the present invention, and as shown in fig. 7, the system may include: a base station 30, at least one user equipment 40;

the base station 30 has the same function as the base station described in fig. 5, and the user equipment 40 has the same function as the user equipment shown in fig. 6, which is not repeated herein.

As can be seen from the above, in the data transmission system provided in the embodiments of the present invention, the base station sends the data packet to the UE through the first transport block of the first HARQ process, and receives the HARQ feedback message returned by the UE, and if the HARQ processes supported by the base station are all used when the base station receives the HARQ feedback message, the base station sends the data packet to the UE through the second transport block of the first HARQ process according to the HARQ feedback message. Therefore, the data packet can be sent in time through another unused transmission block in the HARQ process so as to enlarge the number of the original HARQ processes and avoid the problems of resource waste and overall performance loss caused by the use of all the HARQ processes when the base station receives the HARQ feedback message.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, the method comprising:

a base station sends a data packet to User Equipment (UE) through a first transmission block scheduled by a single code word of a first hybrid automatic repeat request (HARQ) process number;

the base station receives an HARQ feedback message returned by the UE, wherein the HARQ feedback message is used for: feeding back the condition of the data packet received by the UE and sent by the base station through the first transmission block;

if the HARQ process numbers which support single code word scheduling are all used when the base station receives the HARQ feedback message, the base station sends a data packet to the UE through a second transmission block which supports single code word scheduling of the first HARQ process number according to the HARQ feedback message, and the first transmission block and the second transmission block are transmission blocks which support double code word scheduling of the first HARQ process number.

2. The method of claim 1, wherein before the base station sends the data packet to the UE through the first transport block scheduled by the single codeword of the first HARQ process number, the method further comprises:

the base station sends first scheduling information of single code word scheduling of the first HARQ process number to the UE through Downlink Control Information (DCI), so that the UE receives a data packet from a first transmission block of the first HARQ process according to the first scheduling information and determines the condition of the received data packet;

the first scheduling information includes: the process number of the first HARQ process, the identification information of the first transport block of the first HARQ process, and the control information of the first transport block of the first HARQ process, where the control information of the first transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

3. The method of claim 2,

control information of the second transport block is not included in the first scheduling information;

or, the first scheduling information includes control information of the second transport block, and the control information of the second transport block is used to indicate: the second transport block is not used for transmitting data packets.

4. The method of any of claims 1-3, wherein before the base station sends a data packet to the UE via the second transport block scheduled by the single codeword for the first HARQ process number, the method further comprises:

the base station sends second scheduling information of the first HARQ process to the UE through DCI, so that the UE receives a data packet from a second transmission block of the first HARQ process according to the second scheduling information, and determines the condition of the received data packet;

the second scheduling information includes: the process number of the first HARQ process, the identification information of the second transport block of the first HARQ process, and the control information of the second transport block of the first HARQ process, where the control information of the second transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

5. The method of claim 4,

control information of the first transport block is not included in the second scheduling information;

or, the second scheduling information includes control information of the first transport block, where the control information of the first transport block is used to indicate: the first transport block is not used for transmitting data packets.

6. A method of data transmission, the method comprising:

user Equipment (UE) receives a data packet sent by a first transmission block scheduled by a base station through a single code word of a first hybrid automatic repeat request (HARQ) process number;

the UE determines the condition of the received data packet sent by the base station through the first transport block, and returns a HARQ feedback message to the base station, wherein the HARQ feedback message is used for: feeding back the condition of the data packet received by the UE;

if the HARQ process numbers which support single code word scheduling are all used when the base station receives the HARQ feedback message, the UE receives a data packet which is sent to the UE by the base station through a second transmission block which supports single code word scheduling of the first HARQ process number according to the HARQ feedback message, and the first transmission block and the second transmission block are transmission blocks which support double code word scheduling of the first HARQ process number.

7. The method of claim 6, wherein before the UE receives the data packet transmitted by the first transport block scheduled by the base station through the single code word of the first HARQ process number, the method further comprises:

the UE receives first scheduling information of the first HARQ process sent by the base station through Downlink Control Information (DCI); the first scheduling information includes: the process number of the first HARQ process, the identification information of the first transport block of the first HARQ process, and the control information of the first transport block of the first HARQ process, where the control information of the first transport block of the first HARQ process includes: scheduling a coding scheme, a redundancy version number and new data packet indication information;

the determining, by the UE, the received data packet sent by the base station through the first transport block includes:

and the UE receives a data packet from the first transmission block according to the first scheduling information and determines the condition of the received data packet.

8. The method of claim 7,

9. The method of any of claims 6-8, wherein before the UE receives the data packet sent by the base station to the UE via the second transport block scheduled by the single codeword for the first HARQ process number, the method further comprises:

the UE receives second scheduling information of the first HARQ process sent by the base station through DCI, where the second scheduling information includes: the process number of the first HARQ process, the identification information of the second transport block of the first HARQ process, and the control information of the second transport block of the first HARQ process, where the control information of the second transport block of the first HARQ process includes: scheduling coding scheme, redundancy version number and new packet indication information.

10. The method of claim 9,

11. A base station, characterized in that the base station comprises:

a sending unit, configured to send a data packet to a user equipment UE through a first transport block scheduled by a single codeword of a first hybrid automatic repeat request HARQ process number;

a receiving unit, configured to receive a HARQ feedback message returned by the UE, where the HARQ feedback message is used to: feeding back the condition of the data packet received by the UE and sent by the base station through the first transmission block;

the sending unit is further configured to send a data packet to the UE through a second transport block scheduled by a single codeword of the first HARQ process number according to the HARQ feedback message if all HARQ process numbers supported by the base station for single codeword scheduling are used when the receiving unit receives the HARQ feedback message, where the first transport block and the second transport block are transport blocks supported by a dual codeword scheduling by the first HARQ process number.

12. The base station of claim 11, wherein the sending unit is further configured to:

before the sending unit sends a data packet to the UE through a first transmission block scheduled by a single code word of a first HARQ process number, sending first scheduling information of the first HARQ process to the UE through Downlink Control Information (DCI), so that the UE receives the data packet from the first transmission block according to the first scheduling information and determines the condition of the received data packet;

13. The base station of claim 12,

14. The base station according to any of claims 11-13, wherein the sending unit is further configured to:

before the sending unit sends a data packet to the UE through a second transport block scheduled by the single code word of the first HARQ process number, sending second scheduling information of the first HARQ process to the UE through DCI, so that the UE receives the data packet from the second transport block of the first HARQ process according to the second scheduling information, and determining the condition of the received data packet;

15. The base station of claim 14,

16. A User Equipment (UE), the UE comprising:

a receiving unit, configured to receive a data packet sent by a first transport block scheduled by a base station through a single codeword of a first hybrid automatic repeat request HARQ process number;

a processing unit, configured to determine a condition of the data packet received by the receiving unit and sent by the base station through the first transport block;

the receiving unit is further configured to receive, if the HARQ process numbers that the base station supports single codeword scheduling are all used when the base station receives the HARQ feedback message, a data packet that the base station sends to the UE through a second transport block that is scheduled by the single codeword of the first HARQ process number according to the HARQ feedback message, where the first transport block and the second transport block are transport blocks that are scheduled by the first HARQ process number and support double codewords.

17. The UE of claim 16, wherein the receiving unit is further configured to:

before the receiving unit receives a data packet sent by a first transmission block scheduled by a single code word of a first HARQ process number through a base station, receiving first scheduling information of the first HARQ process sent to the UE by the base station through Downlink Control Information (DCI); the first scheduling information includes: the process number of the first HARQ process, the identification information of the first transport block of the first HARQ process, and the control information of the first transport block of the first HARQ process, where the control information of the first transport block of the first HARQ process includes: scheduling a coding scheme, a redundancy version number and new data packet indication information;

and the processing unit is used for receiving the data packet from the first transmission block according to the first scheduling information and determining the condition of the received data packet.

18. The UE of claim 17,

19. The UE of any one of claims 16-18, wherein the receiving unit is further configured to:

before the receiving unit receives a data packet which is sent to the UE by the base station through a second transport block scheduled by the single code word of the first HARQ process number, receiving second scheduling information of the first HARQ process sent to the UE by the base station through DCI;

20. The UE of claim 19,