CN108631948B

CN108631948B - Data retransmission method, communication equipment and data retransmission system

Info

Publication number: CN108631948B
Application number: CN201710170938.1A
Authority: CN
Inventors: 管鹏; 李铕; 毛祺琦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-03-21
Filing date: 2017-03-21
Publication date: 2021-08-20
Anticipated expiration: 2037-03-21
Also published as: CN108631948A

Abstract

The invention discloses a data retransmission method, communication equipment and a data retransmission system. The method comprises the following steps: the method comprises the steps that first indication information fed back by second equipment is received by first equipment, wherein the first indication information indicates data failed in verification in one transmission block; the first device retransmits the data to the second device according to the first indication information, and sends second indication information indicating the retransmitted data to the second device. In the invention, the first device only retransmits the data to the second device aiming at the data with failed verification, the whole transmission block does not need to be retransmitted to the second device every time retransmission is carried out, and the first device retransmits the data to the second device and simultaneously sends the second indication information to the second device, so that the second device can identify the data with failed verification according to the second indication information, thereby effectively improving the retransmission efficiency, saving the resource overhead and improving the system throughput.

Description

Data retransmission method, communication equipment and data retransmission system

Technical Field

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

Background

In a communication system, after a transmitting end transmits data to a receiving end, if the receiving end cannot correctly receive the data, a retransmission request is transmitted to the transmitting end to request retransmission. And the transmitting end initiates retransmission to the receiving end after receiving the retransmission request.

HARQ (Hybrid Automatic Repeat-reQuest) is widely concerned in research of LTE (Long Term Evolution) and NR (New Radio) as a technology combining FEC (Forward Error Correction) and ARQ (Automatic Repeat-reQuest), and its basic principle is as follows:

1) correcting a part of bits with transmission errors by using an FEC (forward error correction) technology at a receiving end;

2) whether the data packet is transmitted correctly is judged through CRC (Cyclic Redundancy Check) Check;

3) and if the transmission is wrong, the retransmission is requested to the sending end.

Taking LTE as an example, in downlink transmission, there is one HARQ process for each Transport Block (TB). If the base station receives a NACK (negative-acknowledgement) feedback from the UE (User equipment) about the HARQ process of the TB, the base station needs to retransmit the entire TB.

The 5G NR differs significantly from LTE by:

1) compared to LTE, the amount of data transmitted in NR is getting larger and more demanding on spectral efficiency than LTE. In a general sense, the TB size in NR is several times the TB size in LTE.

2) The NR supports a scenario in which an enhanced Mobile Broadband (eMBB) service and an ultra-Reliable and Low Latency (ul-Reliable and Low Latency communication) service share bandwidth resources. As shown in fig. 1, the urrllc service may preempt resources of the eMBB service, which may result in a failure to transmit a packet of the eMBB service with the preempted resources. Moreover, the urrllc service may occur at any time, that is, the retransmission of the data packet of the eMBB service may still fail due to the resource preemption of the urrllc service. In general, the probability that all the data packets of the eMBB service cannot be correctly received is high.

These differences in 5G NR present challenges for the conventional HARQ flow. Since each retransmission requires retransmission of the entire TB, it will cause excessive resource overhead and lower overall system throughput.

Disclosure of Invention

In view of this, the present application provides a data retransmission method, a communication device, and a data retransmission system, which aim to reduce resource overhead and improve system overall throughput.

In a first aspect, a data retransmission method is provided, and the method includes: the method comprises the steps that first indication information fed back by second equipment is received by first equipment, wherein the first indication information indicates data failed in verification in one transmission block; and the first equipment retransmits data to the second equipment according to the first indication information, and sends second indication information indicating the retransmitted data to the second equipment. In the method, the first indication information can indicate the data which is failed to be checked, so that the first device can retransmit the data to the second device according to the first indication information, namely, partial retransmission can be realized, and thus the resource overhead of retransmitting the data is reduced. In addition, the second device can identify the retransmitted data according to the second indication information, so that the data which fails to be checked again in the retransmitted data is further identified, partial indication and partial retransmission in the retransmitted data can be realized, and the resource overhead of the retransmitted data is further reduced.

In a second aspect, a data retransmission method is provided, which includes: the second equipment checks the received transmission block sent by the first equipment; when the verification fails, the second device feeds back first indication information to the first device, wherein the first indication information indicates data which fails in the transmission block; the second device receives the data retransmitted by the first device and second indication information for indicating the retransmitted data; and the second equipment identifies the received retransmitted data according to the second indication information. In the method, the first indication information can indicate the data which fails to be checked, so that the first device can retransmit the data to the second device according to the first indication information fed back by the second device, that is, partial retransmission can be realized, thereby reducing the resource overhead of retransmitting the data. In addition, the second device can identify the retransmitted data according to the second indication information, so that the data which fails to be checked again in the retransmitted data is further identified, partial indication and partial retransmission in the retransmitted data can be realized, and the resource overhead of the retransmitted data is further reduced.

According to the second aspect, in a first possible implementation manner of the data transmission method, when the second device fails to check the received retransmitted data, the second device feeds back the first indication information to the first device again, where the first indication information specifically indicates data that fails to be checked in the retransmitted data. In this implementation manner, the second device may feed back the re-checked data in the retransmitted data to the first device, so that the first device may retransmit only the re-checked data when retransmitting again, thereby further reducing resource overhead of retransmitting the data.

According to any one of the first aspect, the second aspect, or any one implementation manner of the second aspect, in another possible implementation manner, the sending, by the first device, second indication information indicating the retransmitted data to the second device includes: in this implementation, the second device can identify the retransmitted data in the time slot according to the second indication information in each time slot, respectively, so that the identification efficiency is higher; or, one piece of the second indication information is sent corresponding to all time slots occupied by retransmitting the data, and the second indication information specifically indicates the retransmitted data in each time slot in all the time slots.

According to any one of the foregoing implementation manners, in another possible implementation manner, the second indication information specifically indicates a code block group corresponding to the retransmitted data; or, the second indication information specifically indicates a time slot occupied by the retransmitted data during initial transmission; wherein the group of code blocks comprises at least one code block.

In another possible implementation manner, the retransmitted data at least includes data that failed in the check in the transport block.

According to any one of the foregoing implementation manners, in another possible implementation manner, the retransmitted data includes: the failed data is checked in the transmission block, so that the resource overhead occupied by the retransmitted data is reduced to the maximum extent; or, all the data transmitted in the time slot occupied by the data failed in verification in the transmission block during initial transmission, so that the second indication information can indicate in the time slot unit, and the overhead of the control channel can be reduced.

According to any one of the foregoing implementation manners, in another possible implementation manner, the data indicated by the first indication information is specifically a code block group with a failed verification in the transport block, so that the first device can know which code block groups with failed verification are specific, which is beneficial for the second device to reduce resource overhead occupied by retransmitted data to the greatest extent; the second indication information specifically indicates a code block group with failed verification, or the second indication information specifically indicates a time slot occupied by the code block group with failed verification during initial transmission; wherein each code block group comprises at least one code block, thereby being beneficial to reducing the overhead of the control channel when the second indication information is indicated in a time slot unit.

According to any one of the foregoing implementation manners, in another possible implementation manner, the first device sends third indication information to the second device, where the third indication information indicates whether the second indication information indicates that the data in the transmission block fails to be checked or indicates that all data transmitted in a time slot occupied by the data in the transmission block during initial transmission is failed to be checked.

According to any one of the foregoing implementation manners, in another possible implementation manner, the first device determines an indication manner of the second indication information according to an indication manner of the first indication information. And the second equipment analyzes the second indication information according to the indication mode of the first indication information.

According to any one of the foregoing implementations, in another possible implementation, the second indication information is specifically a bit map, the number of bits in the bit map is equal to the number of code block groups included in the transport block, each bit in the bit map corresponds to one code block group of the transport block, and when any bit takes a first value, it indicates that the retransmitted data is the code block group corresponding to the bit.

According to any one of the foregoing implementation manners, in another possible implementation manner, the second indication information is specifically a bit map, the number of bits in the bit map is equal to the number of time slots occupied when the transmission block is initially transmitted, each bit in the bit map corresponds to one of the time slots occupied when the transmission block is initially transmitted, and when a value of any bit is a first value, it indicates that the retransmitted data is data transmitted in the time slot corresponding to the bit.

According to any one of the foregoing implementation manners, in another possible implementation manner, the second indication information is specifically a number of a code block group corresponding to the retransmitted data or a number of a time slot occupied by the retransmitted data during initial transmission.

In a third aspect, a communication device is provided, where the communication device may be a network side device or a terminal device, and the communication device includes a transceiver and a processor; the transceiver is used for receiving first indication information fed back by a target device, wherein the first indication information indicates data failed in verification in one transmission block; the processor is used for determining data needing to be retransmitted according to the first indication information; the transceiver is further configured to retransmit the data that needs to be retransmitted to the target device, and send second indication information indicating the retransmitted data to the target device. Because the first indication information can indicate the data which fails to be checked, the communication device can retransmit the data to the target device according to the first indication information, that is, can realize partial retransmission, thereby reducing the resource overhead of retransmitting the data. In addition, the communication device feeds back second indication information to the target device, and the target device can identify the retransmitted data according to the second indication information, so that the data which fails to be checked again in the retransmitted data can be further identified, partial indication and partial retransmission in the retransmitted data can be further realized, and the resource overhead of the retransmitted data is further reduced.

In a fourth aspect, a communication device is provided, where the communication device may be a network side device or a terminal device, and the communication device includes a transceiver and a processor; the processor is used for checking the received transmission block sent by the source equipment; the transceiver is used for feeding back first indication information to the source equipment when the verification fails, wherein the first indication information indicates data which fails in the transmission block; the transceiver is further configured to receive data retransmitted by the source device and second indication information indicating the retransmitted data; the processor is further configured to identify the received retransmitted data according to the second indication information. Because the first indication information may indicate the data that fails to be checked, the source device may retransmit the data to the second device according to the first indication information fed back by the communication device, that is, may implement partial retransmission, thereby reducing resource overhead of retransmitting the data. In addition, the communication device can identify the retransmitted data according to the second indication information, so that the data which fails to be checked again in the retransmitted data can be further identified, partial indication and partial retransmission in the retransmitted data can be further realized, and the resource overhead of the retransmitted data is further reduced.

In a further aspect of the present application, a data transmission system is provided, which includes the communication device of the third and fourth aspects.

In a further aspect of the present application, a computer-readable storage medium is provided, in which computer software instructions for the communication device of the third aspect are stored, which, when run on a computer, cause the computer to perform the method of the above aspects.

In a further aspect of the present application, a computer-readable storage medium is provided, in which computer software instructions for a communication device according to the fourth aspect are stored, which, when run on a computer, cause the computer to perform the method according to the above aspects.

Drawings

Fig. 1 is an exemplary diagram illustrating that a urrllc service occupies resources of an eMBB service in the prior art;

FIG. 2 is an exemplary diagram of a communication system in accordance with one embodiment of the present invention;

FIG. 3 is an exemplary flow chart of a data retransmission method according to an embodiment of the present invention;

fig. 4 is an exemplary diagram of transport block transmission across multiple time slots according to an embodiment of the invention;

fig. 5 is another exemplary diagram of a transport block transmitted across multiple time slots in accordance with an embodiment of the present invention;

fig. 6 is an exemplary diagram illustrating sending of second indication information when indicating the second indication information in units of code block groups according to an embodiment of the invention;

FIG. 7 is a diagram illustrating sending of second indication information when the second indication information is indicated in units of time slots according to an embodiment of the invention;

fig. 8 is another exemplary diagram illustrating sending of second indication information when indicating the second indication information in units of code block groups according to an embodiment of the invention;

FIG. 9 is another exemplary diagram illustrating sending of second indication information when the second indication information is indicated in units of time slots according to an embodiment of the present invention;

fig. 10 is a diagram illustrating transmitting second indication information when indicating the second indication information in units of code block groups according to an embodiment of the invention;

FIG. 11 is a diagram illustrating transmission of second indication information when the second indication information is indicated in units of time slots according to an embodiment of the present invention;

FIG. 12 is a diagram illustrating an exemplary hardware configuration of a communication device according to one embodiment of the invention;

fig. 13 is a diagram illustrating an exemplary hardware configuration of a communication device according to another embodiment of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

The technical solutions of the embodiments of the present invention described below can be applied to a communication system. The communication system may include one or more network-side devices, and one or more terminal devices communicating with each network-side device. Fig. 2 is an example of the communication system, and the communication system shown in fig. 2 includes one network-side device and a plurality of terminal devices (shown as UE1 to UE6 in fig. 2) communicating therewith.

The technical solution of the embodiments of the present invention described below may be communication between a network side device and a terminal device, or communication between two terminal devices, or communication between two network side devices. For example, in the D2D (Device-to-Device) communication technology, if the base station needs to transmit data to the terminal Device 1, there may be a problem that the effect is not good when the base station directly transmits data to the terminal Device 1, and the effect of the base station directly transmitting data to the terminal Device 2 is good, so the base station may first transmit data to the terminal Device 2, and then the terminal Device 2 forwards the data to the terminal Device 1. Here, the technical solutions of the embodiments of the present invention described below can be adopted for the communication between the terminal device 1 and the terminal device 2.

The network side device may be a device capable of communicating with the terminal device. The network side device may be a base station, a relay station, or an access point. The Base Station may be a Base Transceiver Station (BTS) in a GSM (Global System for Mobile Communication) or CDMA (Code Division Multiple Access) network, an nb (nodeb) in a WCDMA (Wideband Code Division Multiple Access) network, or an eNB or enodeb (evolved nodeb) in an LTE (Long Term Evolution). The Network side device may also be a wireless controller in a CRAN (Cloud Radio Access Network) scenario. The network side device may also be a network side device in a future 5G network or a network device in a future evolved PLMN network. The network-side device may also be a wearable device or a vehicle-mounted device.

The terminal device can be a UE (User Equipment), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment, etc. The access terminal may be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN network, etc.

When data is transmitted between two devices (which may be between a network side device and a terminal device, or between two terminal devices, or between two network side devices), each TB corresponds to one HARQ process. For example, in the data transmission flow in LTE, when the TB size exceeds the maximum coding length of the encoder, one TB is divided into multiple small CBs (Code blocks) after adding CRC check bits, each CB adds CRC check bits respectively, and finally all CBs are combined and transmitted through the flow of channel coding and rate matching. As described in the background art, after receiving data, a receiving end performs rate de-matching, decodes and CRC checks on each CB, and finally performs CRC check on the entire TB, and if at least one CB fails to check, the check is considered not to pass, or even if all CBs succeed in checking, the check is considered not to pass when the entire TB fails, and at this time, 1-bit NACK is used for feedback. The transmitting end retransmits the entire TB if it receives NACK. Because each retransmission of the transmitting end needs to retransmit the whole TB, excessive resource overhead is caused, and the total throughput of the system is low.

Aiming at the situation, the technical scheme provided by the embodiment of the invention is as follows: after the transmitting end transmits the transmission block to the receiving end, the receiving end decodes and verifies the received transmission block, and when data failed in verification exists in the transmission block, the receiving end indicates the data failed in verification to the transmitting end. The sending end retransmits the data to the receiving end according to the indication, the retransmitted data at least comprises data which is failed in verification, and the sending end also sends indication information used for indicating the retransmitted data to the receiving end while retransmitting the data. And after receiving the retransmitted data, the receiving end can identify the retransmitted data according to the indication information. The technical scheme provided by the embodiment of the invention does not need to retransmit the whole transmission block to the receiving end during each retransmission, so that the resource overhead of retransmission can be reduced, and the system throughput is improved.

For convenience of description, in the embodiments of the present invention, two devices that transmit data may be referred to as a first device and a second device, respectively, for convenience of distinguishing the two devices. In each embodiment of the present invention, the first device may be, for example, a network side device, and the second device may be, for example, a terminal device. It is to be understood that this is merely an exemplary description.

An embodiment of the present invention provides a data retransmission method, as shown in fig. 3, the method includes:

s100, the first device sends the transmission block to the second device.

In an embodiment of the invention, each transport block may be transmitted across at least two time slots. Each transport block may include at least one code block. At least one code block may be transmitted in each slot.

As shown in fig. 4, it is assumed that CB0, CB1, CB2, CB3, CB4, CB5, CB6, and CB7 each represent code blocks, each transport block being transmitted across four slots, and two code blocks being transmitted within each slot. The four slots are numbered slot0, slot1, slot2, and slot3, respectively. The code blocks transmitted in the slot with the number of slot0 are CB0 and CB1, the code blocks transmitted in the slot with the number of slot1 are CB2 and CB3, the code blocks transmitted in the slot with the number of slot2 are CB4 and CB5, and the code blocks transmitted in the slot with the number of slot3 are CB6 and CB 7.

S101, the second equipment checks the received transmission block.

In the embodiment of the present invention, the second device decodes and verifies each code block of the transport block, and then verifies the entire transport block if all the code blocks are successfully verified. If the entire transport block is successfully checked, the second device determines that the check of the received transport block is successful, and the second device may return ACK (Acknowledgement) information to the first device. And after receiving the ACK information, the first device releases the HARQ process corresponding to the transmission block. When at least one code block check fails, the second device determines that the check on the received transport block fails, and the second device may request retransmission from the first device.

In an embodiment, the second device may check the transport block in units of code block groups. Each code block group includes at least one code block. If at least one code block included in the code block group fails to be checked, confirming that the code block group fails to be checked; and if all code blocks included in the code block group are successfully verified, the code block group is verified successfully.

S102, when the second device fails to verify the received transmission block, the second device feeds back first indication information to the first device, and the first indication information indicates data which fails to verify in the transmission block.

In an embodiment, the first indication information may indicate the minimum unit of the code block group, which may further reduce resource overhead of the control channel. It can be understood that, when the number of code blocks included in each code block group is one, the first indication information indicates that the code block is the minimum unit. Since "the first indication information indicates in the code block group as the minimum unit" is a specific example of "the first indication information indicates in the code block group as the minimum unit", the following embodiments are described by taking the first indication information indicates in the code block group as the minimum unit as an example. As for the TB shown in fig. 4, it is assumed that CB0 to CB7 each represent a code block group, and that code block groups CB0, CB3, CB4, and CB6 transmit errors in the initial transmission. It is to be understood that this is merely an exemplary description.

In an embodiment, "the first indication information indicates data that fails to check in the transport block" may be understood as that the first indication information only indicates data that fails to check in the transport block, and does not indicate other data than the data that fails to check in the transport block; or it can also be understood that the first indication information indicates not only the data that fails to be checked, but also includes data related to the data that fails to be checked in the transmission block, so that transmission resources occupied by the first indication information can be reduced.

The "indication manner" described below may be understood as what manner the indication information (including the first indication information and the second indication information) indicates the data, for example, the data is indicated in the manner of the code block group or in the manner of the time slot. The content of the indication can be understood as a form of, for example, data that fails to be checked, or includes not only the data that fails to be checked, but also all data in a time slot occupied by the data that fails to be checked at the time of initial transmission.

The first indication mode of the first indication information is that the data indicated by the first indication information is specifically a code block group with failed verification in the transport block. Therefore, the second equipment is favorable for reducing the resource overhead occupied by the retransmission data to the maximum extent.

In an embodiment, the first indication information is specifically a bit map, the number of bits in the bit map is equal to the number of code block groups included in the transport block, each bit in the bit map corresponds to one code block group of the transport block, and when any bit takes a first value, the code block group indicating that the check failure indicated by the first indication information is the code block group corresponding to the bit. And when any bit takes the value of the second numerical value, the code block group corresponding to the bit is successfully checked.

It is understood that the first value and the second value can be set according to actual requirements, for example, one can be set to "1", and the other can be "0", as long as the first value and the second value are different.

In the TB shown in fig. 4, the number of code block groups is 8, and the code block groups for which verification fails are CB0, CB3, CB4 and CB6, so that the bit map may be set to (1,0,0,1,1,0,1, 0). Wherein, the first value is "1", which indicates the code block group with failed verification, i.e. the code block group needing to be retransmitted; the second value is "0", indicating the successfully verified code block group. The code block group is indicated through the bitmap, which code block groups failed in verification can be specifically indicated, so that the first device can selectively retransmit the code block groups failed in verification, and the resource overhead occupied by retransmitted data can be reduced to the greatest extent.

Alternatively, in another embodiment, the first indication information is specifically the number of the code block group that failed in the check. This scheme is suitable for a case where the number of code block groups of the TB is large and the number of erroneous code block groups is small. For example, only CB3 in 8 code block groups fails to check, so the first indication information may be "011", and only 3 bits are needed to indicate. Thus, the resource overhead of the control channel can be further saved.

And the data indicated by the first indication information is specifically all code block groups transmitted in the time slot occupied by the code block group with the check failure in the transmission block during initial transmission.

As shown in the TB shown in fig. 5, the number of code block groups is 32, the code block groups are transmitted through 4 slots altogether, the code block groups transmitted in the slot0 are CB0 to CB7, the code block groups transmitted in the slot1 are CB8 to CB15, the code block groups transmitted in the slot2 are CB16 to CB23, and the code block groups transmitted in the slot3 are CB24 to CB 31. Assuming that CB17, CB18, CB19, CB20, CB21 and CB22 are in transmission error in the initial transmission, the first indication information may indicate the code block groups by using the time slot as a unit, which may further save the resource overhead of the control channel.

In an embodiment, the first indication information is specifically a bit map, the number of bits in the bit map is equal to the number of time slots occupied when the transmission block is initially transmitted, each bit in the bit map corresponds to one of the time slots occupied when the transmission block is initially transmitted, and when any bit takes a first value, the code block group indicating that the check failure indicated by the first indication information is included in the code block group in the time slot corresponding to the bit.

It is understood that the code blocks in the time slot corresponding to the bits with the first value may include correctly-checked code blocks, which may be referred to as "data related to data with failed check in the transport block" as described above.

As shown in fig. 5, in the TB, the number of slots is 4, the code block groups failing the check are CB17, CB18, CB19, CB20, CB21, and CB22, the slots occupied by them at the initial transmission are slot2, and the slots occupied by other code block groups are slot0, slot1, and slot 3. Thus, the bitmap can be set to (0,0,1,0), requiring 4 bits to indicate. Wherein, the first value is '1', which represents the time slot occupied by the code block group with failed verification during initial transmission; the second value is "0", which indicates that all the code block groups in the corresponding time slot are successfully verified. The method is suitable for the condition that the code block groups of the TB have more number and the time slots of the code block groups with failed verification are concentrated when the code block groups are initially transmitted. By indicating the time slots by means of a bitmap, the length of the bitmap can be reduced, thereby further reducing the resource overhead of the control channel.

In another embodiment, the first indication information is specifically a number of a timeslot occupied by a code block group that fails to be checked at the time of initial transmission. This approach is suitable for the case where the number of code block groups of the TB is large and the number of time slots occupied by the code block group with the failed verification is small. For example, only the data transmitted in slot2 in the 4 slots fails to check, so the first indication information may be "01", and only 2 bits are needed to indicate. Thus, the resource overhead of the control channel can be further saved.

S103, the first device receives the first indication information fed back by the second device.

And S104, the first equipment determines the data needing to be retransmitted according to the first indication information and generates second indication information. The second indication information is used for indicating the retransmitted data.

S105, the first device retransmits the data needing to be retransmitted to the second device and sends second indication information to the second device.

S106, the second equipment receives the data retransmitted by the first equipment and the second indication information;

s107, the second device identifies the received retransmitted data according to the second indication information.

In step S102, several indication modes of the first indication information are introduced, and in step S104, after receiving the first indication information, the first device needs to know what the indication mode of the first indication information is, and can determine the indication content of the first indication information according to the first indication information, and further determine the data that needs to be retransmitted.

In an embodiment, the indication mode of the first indication information may be defined in advance between the first device and the second device. Therefore, the first device can directly determine the indication content of the first indication information according to the predetermined indication mode.

Or, in another embodiment, when at least one of the first device and the second device is a base station, the base station may further determine an indication manner of the first indication information, and send higher layer signaling to the other end by the base station to inform the other end of the indication manner of the first indication information.

Or, in another embodiment, the indication mode of the first indication information may be determined by one of the first device and the second device, and the indication mode of the first indication information may be informed to the other end by sending control information to the other end.

Or, in another embodiment, the number of code block groups with failed check in each received code block group may also be determined by the second device; when the number of the code block groups failed in verification is larger than a preset number, or the ratio of the number of the code block groups failed in verification to the total number of the code arrays of the transmission block is larger than a preset ratio, the second device sets the indication mode of the first indication information to be a time slot indication mode; and when the number of the code block groups failed in verification is smaller than or equal to the number, or the ratio of the number of the code block groups failed in verification to the total number of the code array of the transmission block is smaller than or equal to a preset ratio, the second device sets the indication mode of the first indication information to a code block group indication mode. The preset number can be set according to actual needs, and for example, the number of the preset number can be 3, 4, and the like. The preset ratio can be set according to actual needs, and can be 0.5, 0.6, and the like. Because the overhead of the second indication information and the first indication information is too large if the code block group indication mode is adopted when the number of the code block groups failed in verification is large, the time slot indication mode is adopted when the number or the proportion of the code block groups failed in verification is large, and the overhead of the second indication information and the first indication information can be effectively reduced. The indicating mode can automatically determine the indicating mode of the first indicating information according to the code block group checking result, further determine the indicating mode of the second indicating information, and can set the indicating mode more reasonably, flexibly and dynamically.

In one embodiment, the retransmitted data is data related to data that failed the check. For example, the retransmitted data may be obtained by inverting the data that failed the check. And after receiving the retransmitted data, the second device performs negation on the received retransmitted data, so that the data with failed verification can be obtained. In addition to the above-mentioned negation, the first device may generate the data related to the data that failed to be checked according to other manners, that is, generate the retransmitted data.

In another embodiment, the retransmitted data comprises at least data that failed the check in the transport block.

In another embodiment, the retransmitted data specifically includes: checking failed data in the transmission block; or, all the data transmitted in the time slot occupied by the data failed in verification in the transmission block during initial transmission. When the data indicated by the first indication information is specifically a code block group with failed verification in the transmission block, the first device may determine the code block group with failed verification as data to be retransmitted, for example, when the number of the code block groups with failed verification is small, the first device may only determine the code block group with failed verification as the data to be retransmitted, thereby reducing the resource overhead occupied by the retransmitted data to the greatest extent; or, the first device may further determine all code block groups transmitted in the time slot occupied by the code block group with the failed verification in the initial transmission as data to be retransmitted, for example, when the TB includes a large number of code block groups and the time slots occupied by the wrong code block groups in the initial transmission are concentrated, the first device may determine all code block groups transmitted in the time slot occupied by the code block group with the failed verification in the initial transmission as data to be retransmitted, so as to reduce the overhead of the control channel. Optionally, the first device may determine the number of code block groups that fail in verification among the received code block groups; when the number of the code block groups failed in verification is greater than the preset number, or the ratio of the number of the code block groups failed in verification to the total number of the code blocks of the transmission block is greater than the preset ratio, the second device may determine all the code block groups transmitted in the time slot occupied by the code block groups failed in verification during initial transmission as data to be retransmitted; when the number of the code block groups failed in the check-up is less than or equal to the number, or the ratio of the number of the code block groups failed in the check-up to the total number of the code blocks of the transmission block is less than or equal to a preset ratio, the second device may determine the code block groups failed in the check-up as data that needs to be retransmitted.

When the data indicated by the first indication information is specifically all code block groups transmitted in a time slot occupied by a code block group with a check failure in a transmission block during initial transmission, the first device may directly determine the data indicated by the first indication information as data that needs to be retransmitted.

Several indication modes of the second indication information are described as follows:

the first indication method of the second indication information indicates, in units of code block groups:

in an embodiment, the second indication information specifically indicates a code block group to which the retransmitted data corresponds.

In one embodiment, if the retransmitted data is data related to data with failed check, the second indication information indicates a code block group corresponding to the related data.

In another embodiment, when the first device determines the code block group with failed verification as data requiring retransmission, the second indication information may specifically indicate the code block group with failed verification. Therefore, the resource overhead occupied by the retransmission data is reduced to the maximum extent.

Optionally, the second indication information is specifically a bit map, the number of bits in the bit map is equal to the number of code block groups included in the transport block, each bit in the bit map corresponds to one code block group of the transport block, and when any bit takes the value of the first value, it indicates that the retransmitted data is the code block group corresponding to the bit. And when any bit takes the value of the second numerical value, indicating that the code block group corresponding to the bit is not included in the retransmitted data.

Or, optionally, the second indication information is a number of a code block group corresponding to the retransmitted data. The resource overhead of the control channel can be further saved. It is understood that the field length of the number of code block groups is log2(N), where N is the number of code block groups comprised by the TB. In the embodiment of the present invention, the number of code block groups is 8, and thus the length of the numbered field of the code block group is 3.

The second indication mode of the second indication information indicates in units of time slots:

in an embodiment, the second indication information specifically indicates a time slot occupied by the retransmitted data at the time of initial transmission.

The first device determines all code block groups transmitted in a time slot occupied by a code block group with a failed verification in initial transmission as data to be retransmitted, the second indication information may specifically indicate the time slot occupied by the code block group with the failed verification in initial transmission, and when the second indication information indicates the time slot, the data to be retransmitted is all the code block groups transmitted in the time slot.

Optionally, the second indication information is specifically a bit map, the number of bits in the bit map is equal to the number of time slots occupied by initial transmission of the transmission block, each bit in the bit map corresponds to one of the time slots occupied by initial transmission of the transmission block, and when a value of any bit is a first value, it indicates that the retransmitted data is data transmitted in the time slot corresponding to the bit. And when any bit takes the value of the second numerical value, the retransmitted data does not comprise the data in the time slot corresponding to the bit.

Or, optionally, the second indication information is a number of a time slot occupied by the retransmitted data at the initial transmission. The resource overhead of the control channel can be further saved. It will be appreciated that the field length of the slot number is log2(M), where M is the total number of slots occupied by the TB in the initial transmission. In the embodiment of the invention, the total number of the time slots occupied by the TB in the initial transmission is 4, so the field length of the serial number of the time slot is 2.

In the above, several indication modes of the second indication information are introduced, and after receiving the second indication information, the second device also needs to know what the indication mode of the second indication information is, so that the indication content of the second indication information can be determined according to the second indication information.

Optionally, the indication mode of the second indication information may be defined in advance between the first device and the second device. Therefore, the second device can directly determine the indication content of the second indication information according to the predetermined indication mode, and further identify the received retransmitted data according to the second indication information.

Or, optionally, the first device may send third indication information to the second device, and the second device receives the third indication information, where the third indication information indicates whether the code block group corresponding to the retransmitted data is indicated by the second indication information or the time slot occupied by the retransmitted data during initial transmission. In an embodiment, the third indication information specifically indicates whether the second indication information indicates the data that failed to be checked in the transmission block or all the data transmitted in the time slot occupied by the data that failed to be checked in the transmission block during the initial transmission. That is, the third indication information indicates the indication manner of the second indication information.

The third indication information may specifically be a higher layer signaling, and the higher layer signaling may be, for example, a Radio Resource Control (RRC) signaling, where the first device may be a base station. The configuration of RRC may be semi-static, i.e. the indication of the network side device remains unchanged for a period of time. The configuration of RRC may also be dynamic. The overhead of the control channel can be effectively saved by the indication mode of the high-level signaling.

Optionally, when the second device is a base station, the second device may also send a higher layer signaling to the first device.

The third indication information may also be control information, for example, 1 bit may be added to the control information, and the indication may be performed by the added bit. For example, "0" may be expressed as an indication of the code block group level; "1" may be expressed as an indication of the slot level. And by controlling the indication mode of the information, the configuration of the indication mode is more flexible, and dynamic adjustment is realized.

Or, optionally, the first device determines the indication mode of the second indication information according to the indication mode of the first indication information. That is, the first device may set the manner of indication of the second indication information to be the same as the manner of indication of the first indication information by default. And the second equipment analyzes the second indication information according to the indication mode of the first indication information. For example, if the first indication information is at a code block level, the second indication information is also at the code block level; if the first indication information is at a time slot level, the second indication information is also at a time slot level. Therefore, the first device does not need to separately notify the second device of the indication method of the second indication information, and the second device may recognize the indication method of the second indication information as the indication method of the first indication information.

In step S105, when the first device sends the second indication information to the second device, the following sending methods may be adopted:

and in the first sending mode, each time slot occupied by the corresponding retransmission of the data is respectively sent with one piece of the second indication information, and each piece of the second indication information specifically indicates the retransmitted data in the corresponding time slot. Therefore, the second device can respectively identify the data retransmitted in each time slot according to the second indication information in the time slot, and the identification efficiency is higher.

In step S106, when receiving the second indication information, the second device receives one piece of the second indication information in each timeslot occupied by the corresponding retransmission of the data. In step S107, the second device identifies the retransmitted data received in each time slot according to the second indication information received in the time slot.

(1) When the second indication information indicates in units of code block groups, as shown in fig. 6, description will be made taking CB0, CB3, CB4, and CB6 as code block groups of the first retransmission as an example. In the first retransmission, the occupied time slots are respectively slotK and slotK +1, wherein the code block groups transmitted in the time slot slotK are CB0 and CB3, and the code block groups transmitted in the time slot slotK +1 are CB4 and CB 6.

And correspondingly sending a second indication message in the slot slotK, wherein the second indication message is used for indicating the CB0 and the CB 3. When the second indication information is a bitmap, the bitmap may be set to (1,0,0,1,0,0,0, 0); when the second indication information is the number of the code block group, it may be set to 000 and 011. In step S107, the second device may identify, according to the second indication information in the slot slotK, that the code blocks received in the slot slotK are CB0 and CB 3.

In addition, a second indication message needs to be correspondingly sent in the slot slotK +1, and the second indication message is used for indicating the CB4 and the CB 6. When the second indication information is a bitmap, the bitmap may be set to (0,0,0,0,1,0,1, 0); when the second indication information is the number of the code block group, it can be set to 100 and 110. In step S107, the second device may identify, according to the second indication information in the slot slotK +1, that the code blocks received in the slot slotK +1 are CB4 and CB 6.

(2) When the second indication information indicates in units of slots, as shown in fig. 7, taking the code block groups with failed verification as CB0-CB6 and CB17-CB22 as examples, the slots occupied by them at the initial transmission are slot0 and slot2, and the slots occupied by other code block groups are slot1 and slot3, respectively. Therefore, at the time of retransmission, the code block groups to be retransmitted are all code block groups in slots slot0 and slot2 at the time of initial transmission, namely CB0-CB7, and CB16-CB 23.

In the retransmission process, the code block group CB0-CB7 occupies the slot slotK, and a piece of second indication information is correspondingly sent in the slot slotK. When the second indication information is a bitmap, the bitmap may be set to (1,0,0, 0); when the second indication information is the number of the time slot, 00 may be set. In step S107, the second device may identify, according to the second indication information in the slot slotK, that the group of code blocks received in the slot slotK is CB0-CB 7.

In addition, the code block group CB16-CB23 occupies the slot slotK +1, and a piece of second indication information is correspondingly sent in the slot slotK + 1. When the second indication information is a bitmap, the bitmap may be set to (0,0,1, 0); when the second indication information is the number of the time slot, it may be set to 10. In step S107, the second device may identify, according to the second indication information in the slot slotK +1, that the code block group received in the slot slotK +1 is CB16-CB 23.

When the first device sends the second indication information to the second device, the first device further needs to send control information to the second device, where the control information may include a HARQ process number corresponding to the transport block, new data indication information, a redundancy version number, and the like, and the second device may identify, according to information such as the HARQ process number in the control information, to which HARQ process the received retransmitted data and the second indication information belong. Alternatively, the second indication information may be transmitted separately from the control information. Alternatively, optionally, the second indication information may also be sent as a part of the control information, for example, a field corresponding to the second indication information may be added in the control information.

In the step S105, when the first device transmits the second indication information to the second device by using the above transmission method, and the second indication information is transmitted in combination with the control information, the following two transmission methods may be further adopted:

1. and respectively sending one control information to each time slot occupied by the corresponding retransmission of the data, wherein each control information respectively comprises the second indication information. Taking an example of adding a new field corresponding to the second indication information in the existing control information (it can be considered that the control information includes the second indication information), as shown in fig. 6, each slot corresponds to one control information, and each control information includes the second indication information. Because each time slot is indicated by the control information containing the second indication information, the second device can effectively identify the code block group transmitted in each time slot according to the control information, and the identification efficiency is high. Especially, when an error occurs in a part of time slots corresponding to retransmission, the receiving of the data retransmitted in other time slots by the second device is not affected, and the transmission efficiency can be effectively improved.

2. And correspondingly retransmitting all time slots occupied by the data to send a primary control information, and correspondingly retransmitting each time slot occupied by the data to send a secondary control information respectively, wherein the secondary control information can be specifically the second indication information or comprises the second indication information. The primary control information may include HARQ process number, new data indication information, redundancy version number, etc. corresponding to the transport block. As shown in fig. 8 and 9, each timeslot corresponds to one secondary control information, and only one primary control information is sent in the first retransmission process. Because the plurality of time slots share the primary control information to indicate the HARQ process, the expense of a control channel is effectively saved. And each time slot corresponds to one piece of second indication information, so that the second equipment can effectively identify the code block group transmitted in each time slot according to the second indication information, the identification efficiency is higher, and the scheduling flexibility is improved.

And sending a second indication message corresponding to all time slots occupied by retransmitting the data, wherein the second indication message specifically indicates the retransmitted data in each time slot in all the time slots. Because the mode that a plurality of time slots share the second indication information for indication is adopted, the expense of a control channel is effectively saved.

In step S106, when receiving the second indication information, the second device receives one piece of the second indication information corresponding to all time slots occupied by retransmitting the data. In step S107, the second device identifies the retransmitted data received in all slots according to the second indication information.

(1) When the second indication information indicates in units of code block groups, CB0, CB3, CB4, and CB6 are taken as examples of the code block groups retransmitted for the first time as shown in fig. 10. During this retransmission, only one second indication information may be transmitted, and the second indication information may be transmitted in one of the time slots. For example, it may be transmitted only in slot slotK. The second indication information indicates the code block groups CB0, CB3, CB4, and CB 6. When the second indication information is a bit map, the bit map may be set to (1,0,0,1,1,0,1, 0). When the second indication information is the number of the code block group, it may be set to 000, 011, 100, and 110. In step S107, the second device may identify the code block groups received in the retransmission to be CB0, CB3, CB4, and CB6 according to the second indication information in the slot slotK.

(2) When the second indication information is indicated in units of time slots, as shown in fig. 11, CB0-CB7 and CB16-CB23 are taken as an example of retransmitted code block groups. During this retransmission only one second indication is sent, which may be sent in one of the slots. For example, it may be transmitted only in slot slotK. The second indication information indicates slot0 and slot2 at the time of initial transmission. When the second indication information is a bit map, the bit map may be set to (1,0,1, 0). When the second indication information is the number of the code block group, 00 and 10 may be set. In step S107, the second device may identify the code block groups received in the retransmission to be CB0-CB7 and CB16-CB23 according to the second indication information in the slot slotK.

In the second transmission mode, control information also needs to be sent to the second device, where the control information may include an HARQ process number corresponding to the transport block, new data indication information, a redundancy version number, and the like, and the second device may identify, according to information such as the HARQ process number in the control information, to which HARQ process the received retransmitted data and the second indication information belong. Alternatively, the second indication information may be transmitted separately from the control information. Alternatively, optionally, the second indication information may also be sent as a part of the control information, for example, a field corresponding to the second indication information may be added in the control information. As shown in fig. 9, taking a field corresponding to the second indication information newly added to the control information as an example, only one piece of control information needs to be sent in the slot slotK.

In the second transmission mode, optionally, the code block components that need to be retransmitted in a retransmission process may be retransmitted at least twice. For example, the first device may initiate one retransmission for the code block groups CB0 and CB3 and additionally initiate one retransmission for the code block groups CB4 and CB 6. Each retransmission correspondingly sends one piece of control information and one piece of second indication information.

For the second transmission mode, the mode that a plurality of time slots share the second indication information for indication is adopted, so that the overhead of a control channel is effectively saved.

In the embodiment of the invention, because the check and the retransmission are carried out by taking the code block group as a unit, when the number of the code blocks included in the transmission block is large, the bit numbers of the first indication information and the second indication information can be reduced, and the expense of a control channel is further effectively saved.

In the embodiment of the present invention, when the first device retransmits the code block group to the second device, the first device also sends the second indication information to the second device, so that the second device can identify which code block groups the received code block group belongs to according to the second indication information, that is, the second device can determine the position of the received code block group at the initial transmission according to the second indication information. Especially, when the check of the received retransmitted code block group part fails, the second device can identify the code block group with failed check according to the second indication information, and then initiate retransmission again only for the code block group with failed check, so that the retransmission efficiency is effectively improved, the resource overhead is saved, and the system throughput and the frequency efficiency are improved. For example, in a retransmission process, the second device may correctly receive the code block group retransmitted in the timeslot slotK +1, but may cause sudden huge fading of a transmission channel due to control channel decoding failure or mobility of the second device, and thus cannot correctly receive the code block group retransmitted in the timeslot slotK, and since the second device may also receive the second indication information, it may identify the code block group received in the timeslot slotK + 1. If the code block group in the slot slotK +1 is successfully verified, the second device only needs to indicate the code block group that cannot be correctly retransmitted in the slot slotK in the next retransmission.

Further, after the step S106, the method further includes: the received retransmitted data is decoded and checked, i.e. the received retransmitted individual code block groups are decoded and checked. In step S107, the second device may identify which code block groups the received retransmitted code block groups are, that is, which code block groups the received retransmitted code block groups respectively correspond to in the initial transmission, according to the second indication information, and determine which check in the received retransmitted code block groups is successful and which check is failed.

The check result of the received code block group is divided into the following cases:

the first case is that the second device successfully checks each received code block group and also successfully checks the entire transport block, and then the second device successfully receives the transport block without retransmission, and instructs the first device to release the HARQ process.

In the second case, the second device successfully checks each received code block group, but fails to check the entire transport block, and then the second device fails to receive the transport block and needs to retransmit the entire transport block, and the second device instructs the first device to retransmit the entire transport block.

In a third case, the second device fails to check the received retransmitted data, and the second device feeds back the first indication information to the first device again, where the first indication information specifically indicates data that fails to check in the retransmitted data. That is, when there is a code block group with a failed check in a retransmitted code block group received by the second device, the second device may feed back the first indication information to the first device again, where the first indication information indicates the code block group with the failed check in the retransmitted code block group received by the second device. For example, as shown in fig. 6, at the time of the first retransmission, the received retransmitted code block groups are CB0, CB3, CB4 and CB6, and assuming that the code block groups CB0 and CB3 fail to check again, the second device may feed back again the first indication information to the first device, where the first indication information indicates only the code block groups CB0 and CB 3. The first device may retransmit only the code block group CB0 and CB3 again to the second device according to the first indication information. Therefore, when the retransmitted data part received by the second device fails to be checked, only the part which fails to be checked is indicated, so that the first device can only partially retransmit the data which fails to be checked again when retransmitting again, and the resource overhead occupied by retransmitted data is further reduced. The detailed description of the first indication information herein can refer to the foregoing description, and is not repeated herein. And after the second device feeds back the first indication information again, returning to execute the step S103, and looping the process until the second device successfully receives the transport block.

And in a fourth case, when the second device fails to check the received retransmitted data and the retransmission times are less than the preset times, the second device feeds back the first indication information to the first device again, the first indication information specifically indicates the data which fails to check in the retransmitted data, the retransmission is performed again, and the process is repeated in this way until the second device successfully receives the transmission block or the retransmission times are greater than or equal to the preset times, and the second device indicates the first device to release the HARQ process. The preset number of times may be set to 4 times, 5 times, and the like, and may be specifically set according to actual needs. Because the modulation order corresponding to each retransmission process is not changed in the same HARQ process, the coding rate is only adjusted. If the preset times or the retransmission is not successful, the current modulation mode is not suitable, so that the current HARQ process can be released. When a new HARQ process is created again, the system may adjust the modulation order of the HARQ process, thereby effectively improving the transmission efficiency. The embodiment of the invention improves the transmission efficiency of the transmission block by limiting the retransmission times.

The present invention further provides a communication device 100, where the communication device 100 may be the first device described in the foregoing embodiment, and the target device described in this embodiment may be the second device described in the foregoing embodiment. As shown in fig. 12, the communication device 100 includes a transceiver 110 and a processor 120, and the transceiver 110 is connected to the processor 120. Optionally, the communication device 100 further comprises a memory 130. The memory 130 is connected to the processor 120 and the transceiver 110, respectively. Further optionally, the communication device 100 further comprises a bus system 140. Wherein the processor 120, the transceiver 110, and the memory 130 may be connected by a bus system 140. The memory 140 may be used to store instructions, and the processor 120 may be used to execute the instructions stored by the memory 140 to control the transceiver 110 to receive and transmit signals; the memory 140 may also be used to cache data generated by the processor 120 during execution of instructions.

The processor 120 is configured to control the transceiver 110 to receive first indication information fed back by a target device, where the first indication information indicates data that fails to be checked in one transport block;

the processor 120 is further configured to determine data that needs to be retransmitted according to the first indication information, where the data that needs to be retransmitted at least includes data that fails to check in the transport block;

the processor 120 is further configured to control the transceiver 10 to retransmit the data that needs to be retransmitted to the target device, and send second indication information indicating the retransmitted data to the target device.

As can be seen from the above-described embodiment, the communication device 100 shown in fig. 12 performs step S100, step S103, step S104 and step S105 in the embodiment shown in fig. 3. Specifically, the transceiver 110 performs step S100, step S103, and step S105 in the embodiment shown in fig. 3. The processor 120 executes step S104 in the embodiment shown in fig. 3. For more details of the transceiver 110 and the processor 120 when performing the above steps, reference may be made to the description in the embodiment shown in fig. 3, and further description is omitted here.

In the embodiment of the present invention, since the first indication information may indicate the data that fails to be checked, the communication device 100 may retransmit the data to the target device according to the first indication information, that is, may implement partial retransmission, thereby reducing resource overhead of retransmitting the data. In addition, the target device can identify the retransmitted data according to the second indication information, so that the data which fails to be checked again in the retransmitted data is further identified, partial indication and partial retransmission in the retransmitted data can be realized, the resource overhead of the retransmitted data is further reduced, and the system throughput is improved.

Other functions of the processor 110 and the transceiver 120 may refer to the description of the corresponding embodiments of the data transmission method, and are not described herein again.

The present invention further provides a communication device 200, where the communication device 200 may be the second device described in the foregoing embodiment, and the source device described in this embodiment may be the first device described in the foregoing embodiment. As shown in fig. 13, the communication device 200 includes a transceiver 210 and a processor 220, and the transceiver 210 is connected to the processor 220. Optionally, the communication device 200 further comprises a memory 230. The memory 230 is connected to the processor 220 and the transceiver 210, respectively. Further optionally, the communication device 200 further comprises a bus system 240. Wherein the processor 220, the transceiver 210, and the memory 230 may be connected by a bus system 240. The memory 240 may be configured to store instructions, and the processor 220 is configured to execute the instructions stored by the memory 240 to control the transceiver 210 to receive and transmit signals; the memory 240 may also be used to cache data generated by the processor 220 during execution of instructions.

The processor 220 is configured to check a received transport block sent by the source device;

the processor 220 is further configured to control the transceiver 210 to feed back first indication information to the source device when the verification fails, where the first indication information indicates data in the transport block that fails to be verified;

the processor 220 is further configured to control the transceiver 210 to receive data retransmitted by the source device and second indication information indicating the retransmitted data, where the retransmitted data at least includes data that failed in verification in the transport block;

the processor 220 is further configured to identify the received retransmitted data according to the second indication information.

As can be seen from the above-described embodiment, the communication apparatus shown in fig. 13 performs step S101, step S102, step S106, and step S107 in the embodiment shown in fig. 3. Specifically, the transceiver 210 executes step S102 and step S106 in the embodiment shown in fig. 3. The processor 220 executes step S101 and step S107 in the embodiment shown in fig. 3. For more details of the transceiver 210 and the processor 220 to perform the above steps, reference may be made to the description in the embodiment shown in fig. 3, and further description is omitted here.

In the embodiment of the present invention, since the first indication information may indicate the data that fails to be checked, the source device may retransmit the data to the communication device 200 according to the first indication information, that is, may implement partial retransmission, thereby reducing resource overhead of retransmitting the data. In addition, the communication device 200 may identify the retransmitted data according to the second indication information, so as to further identify data that fails to be checked again in the retransmitted data, thereby implementing partial indication and partial retransmission in the retransmitted data, and further reducing resource overhead of the retransmitted data.

Other functions of the processor 210 and the transceiver 220 may refer to the description of the corresponding embodiments of the data transmission method, and are not described herein again.

The present invention also provides a data transmission system including the communication device 100 and the communication device 200 described in the above embodiments. Reference may be made to the above embodiments, which are not described herein again.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

In summary, the above description is only an example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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

the method comprises the steps that first indication information fed back by second equipment is received by first equipment, wherein the first indication information indicates data failed in verification in one transmission block;

the first device retransmits data to the second device according to the first indication information, and sends second indication information used for indicating the retransmitted data to the second device, wherein the retransmitted data at least comprises data which fails in verification in the transmission block;

when the number of code block groups failed in verification is less than or equal to a preset number, or the ratio of the number of code block groups failed in verification to the total number of code block groups of the transmission block is less than or equal to a preset ratio, the second indication information specifically indicates the code block group corresponding to the retransmitted data; or when the number of code block groups failed in verification is greater than the preset number, or the ratio of the number of code block groups failed in verification to the total number of code block groups of the transmission block is greater than the preset ratio, the second indication information specifically indicates the time slot occupied by the retransmitted data during initial transmission.

2. The method of claim 1, wherein the first device sending second indication information to the second device indicating the retransmitted data comprises:

sending one piece of second indication information respectively corresponding to each time slot occupied by retransmitting the data, wherein each piece of second indication information specifically indicates the retransmitted data in the corresponding time slot; or,

and sending one piece of second indication information corresponding to all time slots occupied by retransmitting the data, wherein the second indication information specifically indicates the retransmitted data in each time slot in all the time slots.

3. The method of claim 1 or 2, wherein the group of code blocks comprises at least one code block.

4. The method of claim 1, wherein the retransmitted data specifically comprises: checking failed data in the transmission block; or, all the data transmitted in the time slot occupied by the data failed in verification in the transmission block during initial transmission.

5. The method of claim 3, wherein the method further comprises:

the first device sends third indication information to the second device, wherein the third indication information indicates whether the second indication information indicates a code block group corresponding to the retransmitted data or a time slot occupied by the retransmitted data during initial transmission.

6. The method of claim 3, wherein the method further comprises: and the first equipment determines the indication mode of the second indication information according to the indication mode of the first indication information.

7. A method of data retransmission, the method comprising:

the second equipment checks the received transmission block sent by the first equipment;

when the verification fails, the second device feeds back first indication information to the first device, wherein the first indication information indicates data which fails in the transmission block;

the second device receives data retransmitted by the first device and second indication information used for indicating the retransmitted data, wherein when the number of code block groups failed in verification is less than or equal to a preset number, or a ratio of the number of code block groups failed in verification to the total number of code block groups of the transmission block is less than or equal to a preset ratio, the second indication information specifically indicates a code block group corresponding to the retransmitted data; or when the number of code block groups failed in verification is greater than the preset number, or the ratio of the number of code block groups failed in verification to the total number of code block groups of the transmission block is greater than the preset ratio, the second indication information specifically indicates a time slot occupied by the retransmitted data during initial transmission;

and the second equipment identifies the received retransmitted data according to the second indication information, wherein the retransmitted data at least comprises the data which fails in the verification in the transmission block.

8. The method of claim 7, wherein the method further comprises:

when the second device fails to check the received retransmitted data, the second device feeds back the first indication information to the first device again, where the first indication information specifically indicates data that fails to check in the retransmitted data.

9. The method of claim 7 or 8, wherein the second device receiving second indication information for indicating the retransmitted data comprises:

receiving one piece of second indication information respectively corresponding to each time slot occupied by retransmitting the data, wherein each piece of second indication information specifically indicates the retransmitted data in the corresponding time slot; or,

and receiving one piece of second indication information corresponding to all time slots occupied by retransmitting the data, wherein the second indication information specifically indicates the retransmitted data in each time slot in all the time slots.

10. The method of claim 8 or 9, wherein the second indication information specifically indicates a group of code blocks to which the retransmitted data corresponds; or, the second indication information specifically indicates a time slot occupied by the retransmitted data during initial transmission;

wherein the group of code blocks comprises at least one code block.

11. The method of claim 7, wherein the retransmitted data comprises: checking failed data in the transmission block; or, all the data transmitted in the time slot occupied by the data failed in verification in the transmission block during initial transmission.

12. The method of claim 10, wherein the method further comprises: and the second equipment receives third indication information sent by the first equipment, wherein the third indication information indicates whether the code block group corresponding to the retransmitted data is indicated by the second indication information or the time slot occupied by the retransmitted data during initial transmission.

13. The method of claim 10, wherein the second device parses the second indication information according to an indication manner of the first indication information.

14. A communication device, characterized in that the communication device comprises a transceiver and a processor;

the transceiver is used for receiving first indication information fed back by a target device, wherein the first indication information indicates data failed in verification in one transmission block;

the processor is configured to determine data that needs to be retransmitted according to the first indication information, where the retransmitted data at least includes data that fails to be checked in the transport block;

the transceiver is further configured to retransmit the data that needs to be retransmitted to the target device, and send second indication information indicating the retransmitted data to the target device;

15. The communications device as claimed in claim 14, wherein the transceiver is specifically configured to send one of the second indication information for each time slot occupied by retransmitting the data, where each of the second indication information specifically indicates the retransmitted data in its corresponding time slot; or, the transceiver is specifically configured to send one piece of the second indication information corresponding to all time slots occupied by retransmitting the data, where the second indication information specifically indicates the retransmitted data in each time slot of all time slots.

16. The communication device of claim 14 or 15, wherein the group of code blocks comprises at least one code block.

17. The communication device of claim 14, wherein the retransmitted data comprises: checking failed data in the transmission block; or, all the data transmitted in the time slot occupied by the data failed in verification in the transmission block during initial transmission.

18. The communication device of claim 16, wherein the transceiver is further configured to send third indication information to the target device, where the third indication information indicates whether the second indication information indicates a code block group corresponding to the retransmitted data or a time slot occupied by the retransmitted data at initial transmission.

19. The communication device of claim 16, wherein the processor is further configured to determine an indication manner of the second indication information according to an indication manner of the first indication information.

20. A communication device, characterized in that the communication device comprises a transceiver and a processor;

the processor is used for checking the received transmission block sent by the source equipment;

the transceiver is used for feeding back first indication information to the source equipment when the verification fails, wherein the first indication information indicates data which fails in the transmission block;

the transceiver is further configured to receive data retransmitted by the source device and second indication information used for indicating the retransmitted data, where the second indication information specifically indicates a code block group corresponding to the retransmitted data when the number of code block groups failed in verification is less than or equal to a preset number, or a ratio of the number of code block groups failed in verification to the total number of code block groups of the transport block is less than or equal to a preset ratio; or when the number of code block groups failed in verification is greater than the preset number, or the ratio of the number of code block groups failed in verification to the total number of code block groups of the transmission block is greater than the preset ratio, the second indication information specifically indicates a time slot occupied by the retransmitted data during initial transmission;

the processor is further configured to identify the received retransmitted data according to the second indication information, where the retransmitted data at least includes data that failed in verification in the transport block.

21. The communication device of claim 20, wherein when the processor fails to check the received retransmitted data, the transceiver is further configured to feed back the first indication information to the source device again, and the first indication information specifically indicates data that fails to check among the retransmitted data.

22. The communication device according to claim 20 or 21, wherein the transceiver is further configured to receive one piece of the second indication information for each time slot occupied by retransmitting the data, where each piece of the second indication information specifically indicates the retransmitted data in its corresponding time slot; or, the transceiver is further configured to receive one piece of the second indication information corresponding to all time slots occupied by retransmitting the data, where the second indication information specifically indicates the retransmitted data in each time slot of all the time slots.

23. The communication device of claim 20 or 22, wherein the second indication information specifically indicates a group of code blocks to which the retransmitted data corresponds; or, the second indication information specifically indicates a time slot occupied by the retransmitted data during initial transmission;

wherein the group of code blocks comprises at least one code block.

24. The communications device of claim 20, wherein the retransmitted data comprises: checking failed data in the transmission block; or, all the data transmitted in the time slot occupied by the data failed in verification in the transmission block during initial transmission.

25. The communication device of claim 23, wherein the transceiver is further configured to receive third indication information sent by the source device, where the third indication information indicates whether the second indication information indicates a code block group corresponding to the retransmitted data or a time slot occupied by the retransmitted data during initial transmission.

26. The communications device of claim 23, wherein the processor is further configured to parse the second indication information according to the indication of the first indication information.

27. A data retransmission system, characterized in that the data retransmission system comprises a communication device according to any of the claims 14 to 19 and a communication device according to any of the claims 20 to 26.