CN109921884B

CN109921884B - Data receiving and transmitting method, device and communication system

Info

Publication number: CN109921884B
Application number: CN201711332008.8A
Authority: CN
Inventors: 郑黎丽; 秦龙; 纪刘榴; 董朋朋
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-12-13
Filing date: 2017-12-13
Publication date: 2022-04-12
Anticipated expiration: 2037-12-13
Also published as: WO2019114730A1; CN109921884A

Abstract

The embodiment of the application discloses a method for receiving data in a communication network. The method comprises the following steps: a terminal receives M data blocks sent by network equipment, wherein N data blocks in the M data blocks have receiving errors, M, N is an integer, and M is more than or equal to N and more than or equal to 2; and the terminal indicates the target network equipment corresponding to one data block in the N data blocks to retransmit the data block. The network equipment corresponding to one data block in the multiple data blocks with wrong receiving is indicated by the terminal equipment to retransmit, so that N data blocks are prevented from being retransmitted, the retransmission times of the data blocks can be reduced, and downlink transmission resources are saved.

Description

Data receiving and transmitting method, device and communication system

Technical Field

The present application relates to the field of communications, and more particularly, to techniques related to data block retransmission.

Background

In order to improve data rate, cell edge throughput, and system throughput, coordinated multi-point (CoMP) technology is widely used. Downlink CoMP is divided into two categories according to whether network devices share user data: joint Processing (JP) and coordinated scheduling/beamforming (CS/CB). The combined treatment technology is divided into two types: joint Transmission (JT) and dynamic transmission point/cell selection (DPS/DCS).

JT refers to a terminal receiving information of a physical downlink shared channel from multiple network devices and performing coherent or non-coherent combining on the information, thereby improving the quality of received signals and suppressing interference of other terminals. JT has the advantage of improving system spectral efficiency, enhancing cell coverage, and translating inter-cell interference into desired signals. JT can be divided into coherent JT (coherent JT) and non-coherent JT (NC-JT). In coherent JT, multiple network devices jointly precode signals for a terminal, and such cooperation among multiple network devices has strict requirements for backhaul (backhaul) information exchange. In NC-JT, multiple network devices that transmit signals to a terminal perform independent precoding.

In a Long Term Evolution (LTE) system, retransmission of lost or erroneous data is mainly handled by a hybrid automatic repeat request (HARQ) mechanism of a Medium Access Control (MAC) layer and a retransmission function of a Radio Link Control (RLC) layer. The terminal needs to feed back an Acknowledgement (ACK) to each Codeword (CW) that is correctly demodulated, and feed back a Negative Acknowledgement (NACK) to each codeword that fails to be demodulated, and the network device needs to retransmit the codeword that feeds back NACK one or more times until the terminal successfully demodulates. The network equipment retransmits the code word fed back the NACK, which wastes downlink transmission resources.

Disclosure of Invention

The embodiment of the application provides a method, a device and a system for selecting one data block from more than or equal to two data blocks for retransmission, so that the purposes of reducing transmission times and saving downlink transmission resources are achieved.

In a first aspect, an embodiment of the present application provides a data receiving method, where a terminal receives M data blocks sent by a network device, where N data blocks in the M data blocks have a receiving error, M, N is an integer, and M is greater than or equal to N and greater than or equal to 2; and the terminal indicates the target network equipment corresponding to one data block in the N data blocks to retransmit the data block. The data receiving method can reduce the retransmission times of the data blocks and save downlink transmission resources.

Wherein the network device may comprise the target network device.

In a possible implementation manner, the instructing, by the terminal, a target network device corresponding to one data block of the N data blocks to retransmit the data block includes: and the terminal sends information to the target network equipment, wherein the information is used for indicating the target network equipment to retransmit the data block.

In a possible implementation manner, a HARQ feedback message including the information is agreed by the terminal and the network device, and the terminal sends the information to the target network device through the HARQ feedback message.

In a possible implementation, the information is located in a bitmap. At this time, the terminal performs HARQ feedback at a Code Block Group (CBG) level on the target network device, and adds a bit in a usable bit map bitmap to instruct the target network device to retransmit the data block. Compared with the HARQ feedback of the data block level, the method can further reduce unnecessary retransmission and save downlink transmission resources.

In a possible implementation manner, the terminal sends the information to the target network device through the HARQ feedback message. The terminal helps the terminal to indicate the data blocks that need to be retransmitted by predefining new meanings of HARQ messages with the network device. By appointing the meaning of the HARQ feedback message, the terminal can indicate the retransmission of the data block without adding extra fields or uplink transmission resources.

In a possible implementation manner, the terminal instructs the target network device to retransmit the data block through the resource allocated by the network device. This way signaling overhead can be saved.

In a second aspect, an embodiment of the present application provides a data transmission method, where a target network device sends a data block to a terminal, where the data block is one of N data blocks with reception errors in M data blocks sent by the network device to the terminal, where M, N is an integer, and M is greater than or equal to N and greater than or equal to 2; and the target network equipment retransmits the data block according to the indication of the terminal.

Wherein the network device may comprise the target network device.

In a possible implementation manner, the retransmitting, by the target network device, the data block according to the instruction of the terminal includes: and the network equipment receives information sent by the terminal, wherein the information is used for indicating target network equipment to retransmit the data block.

In a possible implementation manner, a hybrid automatic repeat request HARQ feedback message including the information is agreed by the terminal and the network device, and the target network device receives the information sent by the terminal through the HARQ feedback message.

In a possible implementation, the information is located in a bitmap. And the network equipment receives the HARQ feedback of the CBG level of the terminal. In the CBG-level HARQ feedback, a bit is newly added in a bitmap of a bit bitmap, and the target network equipment determines to retransmit the data block according to the newly added bit in the bitmap.

In a possible implementation manner, the target network device retransmits the data block according to an indication of the terminal on a resource allocated to the terminal by the network device.

In a third aspect, the communication device provided in this embodiment of the present application may be a terminal, or may be a chip in the terminal. The communication device has the function of implementing the first aspect described above and each of the possible designs of the first aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible design, the communication device includes a processing unit and a transceiver unit, where the processing unit is configured to control the transceiver unit to implement the functions of the first aspect and the technical solutions of the first aspect as described above in various possible designs.

In another possible design, the communication device includes a processor and a memory, where the memory is used to store a program, and the processor is used to call the program stored in the memory to implement the method for determining time domain resources in the first aspect and any one of the possible designs of the first aspect.

It should be noted that the processor may transmit or receive data through an input/output interface, a pin or a circuit, or the like. The memory may be on-chip registers, cache, etc. In addition, the memory may also be a storage unit located outside the chip in the terminal device, such as a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM), and so on.

The processor mentioned in any of the above may be a general processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling a program for executing the method of the first aspect or any of the possible designs of the first aspect.

In a fourth aspect, the communication apparatus provided in the embodiment of the present application may be a network device, or may be a chip in the network device. The communication device has the function of implementing the second aspect described above and each of the possible designs of the second aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible design, the communication device includes a processing unit and a transceiver unit, and the processing unit is configured to control the transceiver unit to implement the functions of the second aspect and the technical solutions of the second aspect.

In another possible design, the communication device includes a processor and a memory, where the memory is used to store a program, and the processor is used to call the program stored in the memory to implement the method for indicating time domain resources in the second aspect and any one of the possible designs of the second aspect. It should be noted that the processor may send or receive data through an input/output interface, a pin or a circuit, or the like. The memory may be on-chip registers, cache, etc. In addition, the memory may also be a storage unit located outside the chip within the network device, such as a ROM, other types of static storage devices that may store static information and instructions, a RAM, and so forth.

The processor referred to in any of the above may be a general purpose CPU, a microprocessor, a specific ASIC, or one or more integrated circuits for controlling a program for executing the method of data transmission according to the second aspect or any of the possible designs of the second aspect.

In a fifth aspect, the present invention also provides a computer-readable storage medium, which stores a program, and when the program runs on a computer, the program causes the computer to execute the method of the above aspects.

In a sixth aspect, the present application also provides a computer program product comprising a program which, when run on a computer, causes the computer to perform the method of the above aspects.

In a seventh aspect, an embodiment of the present application further provides a communication system, including the communication apparatus in any one of the possible designs of the third aspect or the third aspect, and the communication apparatus in any one of the possible designs of the fourth aspect or the fourth aspect.

By the method, the device and the system, unnecessary retransmission in a communication system can be effectively reduced, and downlink transmission resources are saved.

Drawings

FIG. 1 depicts a communication architecture diagram provided by an embodiment of the present application;

fig. 2 is a flowchart of an interactive method for data transceiving according to an embodiment of the present application;

fig. 3 is a schematic diagram of a communication device provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a communication device provided in an embodiment of the present application;

fig. 5 is a schematic diagram of a communication device provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a communication device provided in an embodiment of the present application;

fig. 7 is a schematic diagram of a communication system provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application are described in further detail below with reference to the accompanying drawings.

The technical solution of the embodiment of the present application may be used in a communication architecture as shown in fig. 1. As shown in fig. 1, the communication architecture includes at least two network devices and a terminal. For example, two network devices, respectively network device a and network device B, and a terminal are included. The terminal can simultaneously receive data transmitted by a plurality of network devices through a Physical Downlink Shared Channel (PDSCH), and the terminal has SIC receiving capability. The terminal having the SIC receiving capability is capable of gradually subtracting interference of a signal with the maximum power from a received signal composed of a plurality of signals, and performing data decision on the plurality of signals in the received signal. If the terminal determines a signal, the interference caused by the signal to the received signal is subtracted. The terminal performs the above operations in sequence by using the power of the plurality of signals, that is, performs data decision on the signal with higher power until all interference is eliminated. The data transmitted by the at least two network devices through the PDSCH may be combined coherently or non-coherently.

It should be understood that the communication architecture shown in fig. 1 may be particularly applicable in various communication systems, such as: global system for mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), time division-synchronous code division multiple access (TD-SCDMA), universal mobile communication system (UMTS), LTE system, etc. with the continuous development of communication technology, the technical solution of the present application can also be used in future networks, such as the fifth generation mobile communication technology (5G) system, which can also be referred to as new air interface (NR) system, or D2D (device to device) system, M2 chip 2M (M) system, etc.

The network device in the present application may be a Transmission Receiving Point (TRP), or may be a base station. It is noted that a base station refers to a device in an access network that communicates over the air-interface, through one or more sectors, with user devices, which may coordinate management of attributes for the air-interface. For example, the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, a base station in WCDMA, a node B (node B), an evolved node B (enode B) in LTE system, a base station in 5G system, a enode B, or a base station in future network.

A terminal (terminal) may include or be referred to as a User Equipment (UE), a terminal equipment (terminal), a Mobile Station (MS), a mobile terminal (mobile terminal), a Subscriber Unit (SU), a Subscriber Station (SS), a mobile station (MB), a Remote Station (RS), an Access Point (AP), a Remote Terminal (RT), an Access Terminal (AT), a User Terminal (UT), a User Agent (UA), or a User Device (UD), etc., which are not limited in this application. The terminal equipment can be referred to as a wireless terminal and a wired terminal. The wireless terminal may refer to a device that provides voice and/or data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem that may communicate with one or more core networks via a Radio Access Network (RAN). For example, the terminal device may be a mobile terminal, such as a mobile phone (or referred to as a "cellular" phone) and a computer having the mobile terminal, and may also be a portable, pocket, hand-held, computer-embedded, or vehicle-mounted mobile device, such as a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), and the like, which exchange language and/or data with a radio access network.

In a multi-stream NC-JT scenario of non-ideal backhaul, as shown in fig. 1, a network device a and a network device B serve a terminal together, and they schedule the terminal independently from each other and send downlink data to the terminal. Each network device may send one or more data blocks to the terminal. The terminal may distinguish network device a and network device B by a cell Identity (ID) or a quasi-co-located (QCL).

Some terms or sentences in the present application are explained below:

the data block referred to in this application includes a Transport Block (TB), or a data block may be understood as a TB. The Code Word (CW) may be understood as a data code stream obtained by sequentially performing Cyclic Redundancy Check (CRC) insertion on a TB, segmenting the TB into Code Blocks (CBs), and then inserting CRC and channel coding into each of the segmented CBs, and performing rate matching. One CW corresponds to one TB direction. In NR, a plurality of CBs obtained by TB segmentation may be grouped to form at least one CBG, and each code block group includes at least one CB.

The network device sends a data block to the terminal, and the terminal device fails to receive the data block due to various reasons, for example, receiving excessive interference from other devices, or fails to correctly demodulate the data block to obtain the content in the data block. In the prior art, the terminal needs the network device to feed back NACK to request the network device to retransmit the data block.

The network device corresponding to the data block referred to in the present application is a network device that transmits the data block to the terminal.

The retransmission means that the transmitting end transmits data to the receiving end again after a certain time after transmitting the data to the receiving end. As a specific retransmission method, a method of additional combining (CC) or Incremental Redundancy (IR) may be referred to. For example, in CC, the retransmitted bit information is the same as the bit information at the time of initial transmission, while the retransmitted bit information in IR is not required to be the same as the bit information at the time of initial transmission, but a plurality of sets of coded bits are generated, each set of coded bits carries the same information, when the transmitting end needs to retransmit, a set of coded bits different from that at the time of previous transmission is usually transmitted, and the receiving end combines the retransmitted data with the data transmitted at the previous time.

HARQ is a technology combining Forward Error Correction (FEC) and automatic repeat request (ARQ) methods. FEC adds redundant information to enable the receiving end to correct a portion of errors, thereby reducing the number of retransmissions. For the error that the FEC cannot correct, the receiving end requests the transmitting end to retransmit the data through an ARQ mechanism. The receiving end uses an error detection code, such as CRC, to detect whether the received data packet is erroneous. If no error exists, the receiving end sends ACK, and the sending end sends the next data packet after receiving the ACK. If the data packet is wrong, the receiving end sends NACK to the sending end, and the sending end retransmits the data packet after receiving the NACK.

In the LTE system, a terminal needs to feed back NACK to network devices respectively corresponding to each data block with an error in reception to request the corresponding network devices to retransmit the data block. With the performance of the terminal being improved, for the terminal with SIC receiving capability, since the terminal will increase the capability of correctly solving the remaining data blocks after successfully solving one of the data blocks, the terminal may not require retransmission of all the data blocks with reception errors.

The terminal may measure a channel state between the terminal and the network device according to the reference signal sent by the network device, and feed back related Channel State Information (CSI) to the network device. And the network equipment performs downlink resource allocation on the terminal according to the CSI fed back by the terminal and realizes data transmission between a downlink channel and the terminal. The embodiment of the application provides a data block retransmission scheme, and under the condition that a terminal receives a plurality of data blocks simultaneously, if more than or equal to two data blocks have receiving errors, the terminal can select one of the data blocks with the receiving errors according to a channel state measurement result of network equipment corresponding to the data block with the sending receiving errors for retransmission, and the other data blocks with the receiving errors are not retransmitted. For example, the terminal may determine, among the network devices corresponding to the data blocks with the reception errors, the network device corresponding to the network device with the best channel state measurement result, and then select the network device to retransmit the data block transmitted by the network device. In the embodiment of the application, one data block is selected for retransmission under the condition that at least two data blocks are received wrongly, so that the transmission times of the data blocks are reduced, and downlink transmission resources are saved.

As shown in fig. 2, an embodiment of the present application provides an interactive method for data transceiving. The following description will be made taking a scenario corresponding to the communication architecture shown in fig. 1 as an example. It is noted that more than two network devices may be included in the architecture. The embodiment of the present application may also be applied to a scenario in which one network device sends multiple data blocks, and at this time, the terminal may select one of the multiple data blocks sent by the one network device as a data block that needs to be retransmitted. No matter which scenario is described above, those skilled in the art can understand how to implement the technical solution described in the embodiment of the present application, and details of the present application are not described again.

202: the terminal receives M data blocks sent by the network equipment, wherein N data blocks in the M data blocks have receiving errors, M, N is an integer, and M is greater than or equal to N and greater than or equal to 2.

In fig. 1, a network device a and a network device B perform independent scheduling on a terminal. That is, the network device in step 202 includes network device a and network device B. At a certain time, or within a certain period of time, the terminal receives data block 0 and data block 1 respectively sent by network device a and network device B. That is, M takes a value of 2 at this time.

The terminal performs demodulation and other processing on the data block 0 and the data block 1 respectively to acquire the contents in the data block 0 and the data block 1. The results of the operation are possible in three ways:

first, data block 0 and data block 1 are both processed correctly, i.e., the terminal successfully acquires the contents of data block 0 and data block 1. At this time, the terminal may respectively feed back the ACK to the network device a and the network device B according to the prior art, and perform the subsequent process;

second, for example, block 0 is processed correctly and the terminal successfully acquires the content in block 0, while block 1 is not processed correctly and the terminal does not acquire the content in block 1. At this time, the terminal may still respectively feed back ACK to the network device a and NACK to the network device B according to the prior art, and the network device B retransmits the data block 1 and performs subsequent processes;

third, neither data block 0 nor data block 1 is processed correctly, i.e., the terminal does not acquire the contents of data block 0 and data block 1. The scenario included in step 202 of the present application belongs to the third possibility, that is, when 2 data blocks are received in error, that is, M is 2, and N is 2.

In a third possibility, the terminal may buffer a received signal, where the received signal is a sum of a data block and noise that are sent by different network devices and reach the receiving end after passing through a channel.

204: and the terminal indicates the target network equipment corresponding to one data block in the N data blocks to retransmit the data block.

As can be seen from step 202, the N data blocks include data block 0 and data block 1, the network device corresponding to the data block 0 is network device a, and the network device corresponding to the data block 1 is network device B.

The terminal selects a data block with an error in reception as a data block to be retransmitted in the next data transmission period, that is, selects one of the data block 0 and the data block 1 as a data block to be retransmitted in the next data transmission period. Optionally, the terminal performs channel quality measurement on channels corresponding to the network device a and the network device B, respectively, according to the reference signals sent by the network device a and the network device B, selects a channel with a relatively high CQI or a channel with a relatively high SINR from the two channels, based on the measurement result, and uses the corresponding data block as a data block to be retransmitted in the next data transmission period. For example, the data block corresponding to the channel with the higher CQI value is data block 0, and then the terminal selects data block 0 as the data block to be retransmitted in the next data transmission period.

Then, the terminal instructs the network device a corresponding to the data block 0 to retransmit the data block 0. The target network device corresponding to one of the N data blocks is, in this embodiment, the network device a.

With respect to the specific manner of the terminal indication, a description will be made in the following embodiments.

Optionally, the terminal feeds back NACK to the network device a and feeds back NACK to the network device B.

206: and the target network equipment retransmits the data block according to the instruction of the terminal.

As mentioned above, the target network device is the network device a in the embodiment of the present application.

In the embodiment of the present application, different from the prior art, when receiving NACK sent by a terminal, network device a does not indicate that it needs to transmit data to the terminal next time, that is, retransmit data block 0 in the next data transmission period, and when network device a needs to receive an instruction from the terminal, it can determine that it transmits data to the terminal next time, that is, retransmit data block 0 in the next data transmission period.

In this embodiment, the network device a receives the instruction of the terminal to retransmit the data block 0, and the network device a needs to retransmit the data block 0 in the next data transmission period when transmitting data to the terminal next time. The method for retransmitting the data block by the network device a may refer to the prior art, and is not described herein again.

In addition, even if network device B receives NACK transmitted by the terminal, network device B does not retransmit data block 1 in the next period of transmitting data to the terminal because it does not receive the instruction from the terminal. Optionally, the network device B caches the data block 1 in the buffer, and when a new data block, for example, the data block 3, needs to be sent to the terminal, the network device B may send the data block 3 to the terminal in the next data transmission cycle, that is, in the next data transmission cycle. For data block 1, if ACK for data block 1 from the terminal is subsequently received, the data block 1 buffered in the buffer is emptied, and if NACK for data block 1 from the terminal is subsequently received again, data block 1 may be retransmitted.

As an implementation manner, after receiving the data block 0 retransmitted by the network device a, the terminal performs processing such as demodulation on the retransmitted data block to obtain the content of the retransmitted data block 0. Optionally, the terminal may perform HARQ soft combining with the previously received data block 0, that is, the data block 0 received in step 202, that is, combining with the previously buffered signal (the retransmitted data block 0 and the previously buffered data block 0 may correspond to different redundancy versions), and attempt to acquire the content of the data block 0. It should be noted that the use of HARQ soft combining will increase the probability that the terminal successfully receives data block 0. If the terminal acquires the content of data block 0, it may further use its SIC capability to perform processing such as demodulation again on data block 1 received in step 202 in an attempt to acquire the content in data block 1. If the terminal acquires the content of the data block 1, based on this, the terminal feeds back ACK to both the network device a and the network device B for the data block 0 and the data block 1, respectively. If the terminal still fails to acquire the content of the data block 1, the terminal feeds back ACK to the network device a for the data block 0 and feeds back NACK to the network device B for the data block 1. At this point, network device B may choose to retransmit data block 1, as previously described.

If the terminal still does not acquire the content of the data block 0, at this time, the terminal feeds back NACK to both the network device a and the network device B for the data block 0 and the data block 1, respectively, and does not perform any additional instruction, then the network device a and the network and the device B retransmit the data block 0 and the data block 1, respectively, according to the scheme in the prior art.

In the embodiment of the application, if the number of the data blocks which are received by the terminal in error is more than or equal to two, the terminal selects one data block of the data blocks which are received in error for retransmission. After the terminal demodulates the retransmitted data block, the SIC performance is utilized to recover the data block which is received by the terminal incorrectly but is not retransmitted, so that the retransmission times of the data block are reduced in the process of receiving the data block by the terminal, and downlink transmission resources are saved.

In addition, in this embodiment of the present application, when the value of N is greater than or equal to 3, the terminal may instruct more than one data block to perform retransmission, for example, in step 202, at a certain time or within a certain period of time, the terminal receives the data block 01 and the data block 02 transmitted by the network device a, the terminal receives the data block 10 transmitted by the network device B, that is, the value of M is 3, and all the data block 01, the data block 02, and the data block 10 receive errors, that is, N is 3. At this time, the terminal may instruct the network device a corresponding to the data block 01 and the data block 02 to retransmit the data block 01 and the data block 02, similar to step 204. At this time, other steps for implementing the technical solution of the embodiment of the present application are similar to those of the foregoing embodiment, and those skilled in the art can obtain the technical solution without creative work, and therefore, the details are not described again.

The following describes a specific manner of the terminal indication in step 204 in the embodiment of fig. 2. The rest of the steps can be expressed in the implementation of fig. 2, and are not described in detail herein.

As an implementation manner, the terminal sends information to the target network device, where the information is used to instruct the target network device to retransmit the data block.

That is, in the embodiment of fig. 2, the terminal sends information to the network device a, where the information is used to instruct the network device a to retransmit the data block 0.

Specifically, the terminal may transmit the indication information to the network device a through a field carried in the message. The message may be an existing message or a newly defined message.

In connection with the embodiment of fig. 2, the terminal may send the message to both network devices a and B, where the message includes a field. Assuming that the field is 1 bit, when the bit is "1", the corresponding terminal transmits the indication information to the network device. That is, in this embodiment, the value of the bit in the message received by network device a should be "1" to instruct network device a to retransmit data block 0, and although network device B also receives the message, the bit value of the message is "0", so that it is not considered that the instruction information is received. It should be noted that, in a specific implementation, when the bit is "0", the corresponding terminal may also send the indication information to the network device, and the application is not limited thereto. For another example, when the bit is not flipped, the corresponding terminal sends the indication information to the network device, as opposed to the last time the terminal sent the message to network devices a and B. That is, in this embodiment, the value of the bit in the message received by the network device a is not inverted, and is used to instruct the network device a to retransmit the data block 0, and although the network device B also receives the message, the network device B does not consider that the indication information is received because the bit of the message is inverted. Where flipping refers to the value of the bit changing from "1" to "0" or from "0" to "1" relative to the last received message. It should be noted that, in a specific implementation, the corresponding terminal may also send the indication information to the network device when the bit is turned over, which is not limited in this application.

It should be further noted that the bits of the field may be not only 1 bit, but also 2 bits, and may be 4 bits, etc., which are not listed here.

In the NR system, as described above, a plurality of CBs after TB segmentation may be further grouped to form at least one CBG, and each code block group includes at least one CB. Thus, CBG level retransmissions may be supported in NR systems, i.e. when a data block receives an error, only the CBG or CBGs in the data block that received the error are retransmitted, instead of retransmitting the entire data block. That is to say, the data block that needs to be retransmitted is actually at least one CBG in the data block that needs to be retransmitted, and the at least one CBG is a CBG that the terminal receives an error. On the other hand, if the data block does not need to be retransmitted, all the data blocks in the data block do not need to be retransmitted.

Based on this, as another specific way of the terminal indication, it may be:

the terminal performs CBG-level HARQ feedback on the data block transmitted by the network device (i.e., indicates each CBG is successfully or erroneously received), and when an ACK or NACK is fed back, a new bit is added to a used bit map, which is used to indicate whether the network device retransmits the data block next time when transmitting data to the terminal, i.e., the next data transmission period. For example, if the value of the bit is "1", it indicates that the data block needs to be retransmitted; if the value of the bit is 0, it indicates that the data block does not need to be retransmitted. And vice versa. That is to say, in this embodiment, the network device a receives NACK fed back by the terminal, and the bitmap used correspondingly includes a new bit with a value of "1", and the corresponding terminal sends information to the network device a, which is used to instruct to retransmit the data block 0. And the network device B receives the NACK fed back by the terminal, and the bitmap used correspondingly includes a newly added bit whose value is "0", so that the terminal is not considered to have sent the information indicating retransmission to the network device B, and the network device B does not need to retransmit the data block 1 when transmitting data to the terminal next time, that is, in the next data transmission period.

For the terminal, in the implementation manner, the newly added bit position of the bitmap fed back by the CBG corresponding to the selected data block 0 is set to 1, and the information on whether each CBG of the data block 0 needs to be retransmitted or not is filled in the bitmap fed back by the CBG corresponding to the data block 0; and setting the newly added bit position of the bitmap fed back by the CBG corresponding to the data block 1 as 0, and filling the information on whether each CBG of the data block 1 needs to be retransmitted into the bitmap fed back by the CBG corresponding to the data block 0.

For the network device A or the network device B, when the multi-bit feedback of the CBG is received, newly-added bit of bitmap used by the network device A is checked, and for the network device A, the value of the newly-added bit is '1', the CBG which needs to be retransmitted in the data block 0 is retransmitted; for the network device B, if the value of the newly added bit is "0", the CBG to be retransmitted in the data block 1 is buffered, and a new data block 3 can be transmitted. And for the CBG which needs to be retransmitted in the data block 1, emptying the buffer corresponding to the CBGs after the ACK corresponding to the CBG is received, and if the value of the bitmap newly-added bit used by the multi-bit feedback of the CBG is received by the network equipment B before the ACK of the CBG is received is changed into '1', retransmitting the CBG which needs to be retransmitted in the data block 1.

The embodiment of the application realizes the retransmission of the CBG level in the NR system. In the NR network system of CBG level retransmission, the gNode B retransmits all CBGs which need to be retransmitted in the data block selected for retransmission according to the newly added information in the bitmap. Further, if the terminal indicates the data block to be retransmitted, the network device obtains the CBGs which failed to be received in the data block according to the bitmap, and retransmits the CBGs. If the terminal indicates that the data block is not retransmitted, the network device does not retransmit all CBGs in the CW. Therefore, in the NR network system according to the embodiment of the present application, the terminal instructs the network device to retransmit a CBG that the terminal has received an error, so that unnecessary data retransmission of the network device to a CBG that the terminal has received a correct CBG can be avoided, and downlink transmission resources can be saved.

Note that the indication method based on the CBG level may be applied to any terminal indication method in the present application in a superimposed manner.

As another specific way for the terminal to indicate, the terminal may also help the terminal to indicate the data block that needs to be retransmitted by predefining a new meaning of the HARQ message with the network device. The network device may be a main network device that provides a service for the terminal, or may be the target network device, and certainly in some scenarios, the target network device may be the main network device. It should be noted that, the main network device in this embodiment refers to a network device that establishes an initial connection with a terminal, or a network device that performs RRC connection reestablishment on a time domain terminal, or a network device that is designated in a handover process.

Specifically, there are currently two types of feedback messages for HARQ: ACK (i.e., indicating a successful transmission of the data block) and NACK (i.e., indicating a failed transmission of the data block), values of bits corresponding to the message for HARQ feedback may correspond to "1" and "0", respectively. In this embodiment, a null response may be added, where the transmission power at the bit of the message corresponding to the HARQ feedback is 0. The terminal and the network device may predefine the NACK in the three feedback messages in a predetermined manner, for example, to indicate that the terminal has received the data block corresponding to the NACK incorrectly and indicate the network device to retransmit the data block at the same time, that is, the NACK may be considered to include information for indicating the network device to retransmit the data block corresponding to the NACK. The null response is used to indicate that the network device and the corresponding data block terminal receive an error, and when data is transmitted to the terminal next time, that is, the network device does not need to retransmit the data block corresponding to the null response in the next data transmission period. The ACK is consistent with the meaning indicated in the prior art, and is used to indicate that the network device and its corresponding data block terminal successfully receive the ACK.

For example, for the embodiment of fig. 2, the NACK sent by the terminal received by the network device a is used to indicate that the terminal received the data block 0 incorrectly, and indicate that the network device a retransmitted the data block 0. The network device B detects that the data block 1 is a null response, that is, although the terminal device receives the data block 1 incorrectly, the terminal device B does not need to retransmit the data block 1 temporarily.

Of course, corresponding meanings of the above three HARQ feedback messages may be exchanged, for example, the null response is used to instruct the network device to retransmit information of the data block corresponding to the NACK, the NACK is used to instruct the network device to receive an error with the data block terminal corresponding to the network device, and when data is transmitted to the terminal next time, that is, the network device does not need to retransmit the data block corresponding to the null response in the next data transmission period. The ACK is consistent with the meaning indicated in the prior art, and is used to indicate that the network device and its corresponding data block terminal successfully receive the ACK. As long as the agreement between the terminal and the network device is consistent, the embodiment of the present application does not limit this.

Optionally, two bits may also be used for the above three HARQ feedback messages, for example, 00 indicates a null response, 01 indicates an ACK, and 10 indicates a NACK. The embodiments of the present application do not exclude other representations.

According to the embodiment of the application, by appointing the meaning of the HARQ feedback message, the terminal can indicate the retransmission of the data block without adding extra fields or uplink transmission resources.

As another specific way of the terminal to indicate, the terminal instructs the target network device to retransmit the data block through the resource allocated by the network device. The network device may allocate a dedicated resource to the terminal, and the terminal may indicate whether the network device needs to retransmit a specific data block sent by the terminal through the dedicated resource. Optionally, the network device may be a main network device that provides services for the terminal, that is, the main network device performs uniform distribution, or may be the target network device. The following description will take this network device as a target network device by way of example. In the embodiment of fig. 2, the network device a allocates a dedicated resource 1 to the terminal, and the terminal may feed back NACK to the network device a for the data block 0, and instruct the network device a to retransmit the data block 0 in the form of not sending any signal on the resource 1 in the appointed time 1. The network device B allocates a dedicated resource 2 to the terminal, and the terminal may feed back NACK to the network device B for the data block 1, and send a signal on the resource 2 within the appointed time 2, at this time, it may be considered that the network device B does not retransmit the data block 1 for the next time when transmitting data to the terminal, that is, the next data transmission period.

It should be noted that the terminal may also instruct retransmission of the data block 0 by sending a signal on the resource 1 in the appointed time period 1. At this time, the corresponding terminal does not send any signal on the resource 2 in the appointed time period.

In the embodiment of the application, if the number of the data blocks with the receiving errors of the terminal is more than or equal to two, the terminal instructs the network equipment to select one data block from the data blocks with the receiving errors for retransmission. When the data block does not need to be retransmitted, the terminal sends signals through the resources allocated by the network equipment, when the data block needs to be retransmitted, the terminal does not send signals, and the network equipment retransmits the data block needing to be retransmitted according to the existence of the signals on the time-frequency resources, so that the signaling overhead can be saved.

In addition to the technical solution described in the embodiment of fig. 2, when the number of data blocks sent by the network device that is received by the terminal by mistake is greater than or equal to two, the semi-static configuration of the RRC layer may be performed according to the channel quality information of the data blocks, for example, the semi-static configuration is performed by a main network device having a service and a terminal. The network device determines whether to retransmit the data block according to the semi-static configuration information.

The following detailed description is made:

as shown in fig. 1, it is assumed that a network device a and a network device B exist in a multi-stream NC-JT scenario of non-ideal backhaul, and if the network device a is a network device initially connected to a terminal, or a network device performing RRC connection reestablishment with the terminal, or a designated network device in a handover process, it is considered that the network device a is a primary network device and the network device B is a secondary network device.

The terminal may perform channel quality measurement on transmission channels corresponding to the network device a and the network device B, respectively, obtain CSI1 and CSI2 corresponding to the transmission channels corresponding to the network device a and the network device B, respectively, and feed back the CSI to the network device a, where the network device a performs RRC semi-static configuration according to CSI1 and CSI2 fed back by the terminal, where the configuration indicates how to perform data block retransmission in a next data transmission period when the terminal receives a data block 0 sent by the network device a and a data block 1 sent by the network device B. For example:

1) the master network device (network device a) retransmits block 0 of data it transmits. The auxiliary network device (network device B) does not retransmit the data block 1 sent by it, and may cache the data block 1; alternatively, the first and second electrodes may be,

2) the secondary network device (network device B) retransmits the data block 1 it transmitted. The main network device (network device a) does not retransmit the data block 0 sent by it, and can buffer the signal data block 0; alternatively, the first and second electrodes may be,

3) the primary network device (network device a) retransmits block 0 of data it transmits and the secondary network device (network device B) retransmits block 1 of data it transmits.

For example, when the CSI includes CQI, it may be considered that the channel quality between the network device and the terminal corresponding to the higher CQI index is better, and the network device is selected for retransmission, which corresponds to 1) (when the channel quality between the network device a and the terminal is better) or 2) (when the channel quality between the network device B and the terminal is better); if the CQI indexes of both network devices are low, (3), that is, the scheme of the embodiment of the present application is not adopted, and the data block received and decoded by the terminal in error is retransmitted.

When the mode 1) or 2) is selected for retransmission, subsequent operations of the terminal and the corresponding network device are similar to step 206 in the embodiment of fig. 2, and are not described again.

Based on the same concept, as shown in fig. 3, a schematic diagram of a communication apparatus provided in the present application, which may be a terminal or a chip or a system on a chip in the terminal, may execute the method executed by the terminal device in the embodiments of the present application.

The communication device 300 includes at least one processor 310, a memory 330.

The memory 330 is used for storing programs, and may be a ROM or other types of static storage devices that can store static information and instructions, such as a RAM or other types of dynamic storage devices that can store information and instructions, an EEPROM (Electrically erasable programmable read-only memory), a CD-ROM (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage devices, or any other medium that can be used to carry or store desired programs in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory 330 may be separate and coupled to the processor 310. The memory 330 may also be integrated with the processor 310.

The processor 310 is configured to execute the program in the memory 330 to implement the steps executed by the terminal device in the method for determining time domain resources according to the embodiment of the present application, and reference may be made to the above for related features, which are not described herein again. For example, the processor 310 may be a general purpose CPU, microprocessor, special purpose ASIC, or one or more integrated circuits for controlling the execution of programs in accordance with the teachings of the present application.

In particular implementations, processor 310 may include one or more CPUs such as CPU0 and CPU1 in fig. 3, for example, as an embodiment.

In particular implementations, communication device 300 may include multiple processors, such as processor 310 and processor 311 from FIG. 3, for example, as an example. Each of these processors may be a single-Core (CPU) processor or a multi-Core (CPU) processor, where a processor may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

Optionally, when the communication apparatus 300 is a terminal device, a transceiver 320 as shown in fig. 3 may be further included for communicating with other devices or a communication network, and the transceiver 320 includes a radio frequency circuit. Wherein the processor 310, the transceiver 320, the memory 330 may be connected by a communication bus in the terminal device. The communication bus may include a path for transferring information between the units. When the apparatus 300 is a chip or a system on a chip in a terminal device, the processor 310 may send or receive data through an input/output interface, pins or circuits, etc.

As shown in fig. 4, a schematic diagram of another communication apparatus according to an embodiment of the present application, where the apparatus may be a terminal or a chip or a system on a chip in the terminal, and may perform the method performed by the terminal device in the foregoing embodiments of the present application.

The apparatus comprises a processing unit 401 and a transceiving unit 402.

Wherein, the processing unit 401 is configured to control the transceiving unit 402 to implement the method performed by the terminal device in the embodiment shown in the figure.

Based on the same concept, as shown in fig. 5, a schematic diagram of a communication apparatus provided in the present application, which may be, for example, a target network device, a chip or system on chip in the target network device, or a chip or system on chip in the network device, may execute the method executed by the target network device or the network device in the embodiments of the present application.

The communication device 500 includes at least one processor 510, a memory 530.

Memory 530 is used to store programs and may be, but is not limited to, ROM or other types of static storage devices that can store static information and instructions, such as RAM or other types of dynamic storage devices that can store information and instructions, EEPROM, CD-ROM or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired programs in the form of instructions or data structures and that can be accessed by a computer. The memory 530 may be separate and coupled to the processor 510. Memory 530 may also be integrated with processor 510.

The processor 510 is configured to execute the program in the memory 530 to implement the steps executed by the network device in the method for indicating time domain resources in this embodiment of the application, and reference may be made to the above for related features, which are not described herein again. For example, processor 510 may be a general purpose CPU, microprocessor, special purpose ASIC, or one or more integrated circuits configured to control the execution of programs in accordance with the teachings of the present application.

In particular implementations, processor 510 may include one or more CPUs such as CPU0 and CPU1 in fig. 5 for one embodiment.

In particular implementations, communications apparatus 500 may include multiple processors, such as processor 510 and processor 511 of fig. 5, for example, as an example. Each of these processors may be a single-Core (CPU) processor or a multi-Core (CPU) processor, where a processor may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

Optionally, when the communication apparatus 500 is a target network device, the latter network device, the communication apparatus may further include a transceiver 520 as shown in fig. 5, for communicating with other devices or a communication network, and the transceiver 520 includes a radio frequency circuit. Wherein the processor 510, the transceiver 520, and the memory 530 may be connected by a communication bus in the network device. The communication bus may include a path for transferring information between the units. When the apparatus 500 is a chip in a network device or a system-on-board, the processor 510 may send or receive data through an input/output interface, pins or circuits, etc.

As shown in fig. 6, a schematic diagram of another communication apparatus according to an embodiment of the present application, which may be, for example, a target network device, a chip or system on chip in the target network device, or a chip or system on chip in the network device, may execute a method executed by the target network device or the network device in various embodiments of the present application.

The communication device comprises a processing unit 601 and a transceiving unit 602.

The processing unit 601 is configured to control the transceiver unit 602 to implement the method executed by the target network device or the network device in this embodiment of the application.

It should be understood that the manner in which the communication devices shown in fig. 4 and 6 are divided into modules is illustrative, and is merely one logical functional division, and that in actual implementation, there may be other divisions. For example, the transceiver unit is divided into a receiving unit and a transmitting unit.

As shown in fig. 7, an embodiment of the present application further provides a communication system, which includes a communication apparatus 300 and a communication apparatus 500.

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 application 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.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus (device), computer-readable storage medium, or computer program product. Accordingly, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "module" or "system.

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

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of data reception, comprising:

a terminal receives M data blocks sent by network equipment, wherein N data blocks in the M data blocks have receiving errors, M, N is an integer, and M is more than or equal to N and more than or equal to 2;

and the terminal indicates target network equipment corresponding to one data block in the N data blocks to retransmit the data block, wherein the data block is used for recovering the data blocks which are not retransmitted in the N data blocks.

2. The method of claim 1, wherein the network device comprises the target network device.

3. The method according to claim 1 or 2, wherein the terminal instructs a target network device corresponding to one of the N data blocks to retransmit the one data block, and comprises:

and the terminal sends information to the target network equipment, wherein the information is used for indicating the target network equipment to retransmit the data block.

4. The method of claim 3, wherein a hybrid automatic repeat request (HARQ) feedback message including the information is promised by the terminal with the network device, and wherein the terminal sends the information to the target network device via the HARQ feedback message.

5. The method of claim 1, wherein the terminal instructs a target network device corresponding to one of the N data blocks to retransmit the one data block, and wherein the method comprises:

and the terminal instructs the target network equipment to retransmit the data block through the resources allocated by the network equipment.

6. A method of data transmission, comprising:

the target network equipment sends a data block to the terminal, wherein the data block is one of N data blocks with receiving errors in M data blocks sent to the terminal by the network equipment, M, N is an integer, and M is more than or equal to N and more than or equal to 2;

and the target network equipment retransmits the data block according to the indication of the terminal, wherein the data block is used for recovering the data block which is not retransmitted in the N data blocks.

7. The method of claim 6, wherein the network device comprises the target network device.

8. The method according to claim 6 or 7, wherein the target network device retransmits the data block according to the indication of the terminal, including:

and the target network equipment receives information sent by the terminal, wherein the information is used for indicating the target network equipment to retransmit the data block.

9. The method of claim 8, wherein a hybrid automatic repeat request (HARQ) feedback message including the information is promised by the terminal and the network device, and wherein the target network device receives the information sent by the terminal through the HARQ feedback message.

10. The method of claim 6, wherein the target network device retransmits the data block according to the indication of the terminal, and comprising:

and the target network equipment retransmits the data block according to the indication of the terminal on the resource allocated to the terminal by the network equipment.

11. A communications apparatus, comprising: a processor and a memory;

wherein the memory is used for storing programs;

the processor is configured to execute the program stored in the memory to implement the method according to any one of claims 1 to 5.

12. A communications apparatus, comprising: a processor and a memory;

wherein the memory is used for storing programs;

the processor is configured to execute the program stored in the memory to implement the method according to any one of claims 6 to 10.

13. A communication system comprising a communication apparatus as claimed in claim 11, and a communication apparatus as claimed in claim 12.

14. A computer-readable storage medium, characterized in that it stores a program which, when run on a computer, causes the computer to perform the method according to any one of claims 1 to 10.