WO2019101122A1

WO2019101122A1 - Method and device for transmitting data

Info

Publication number: WO2019101122A1
Application number: PCT/CN2018/116888
Authority: WO
Inventors: 王刚
Original assignee: 华为技术有限公司
Priority date: 2017-11-24
Filing date: 2018-11-22
Publication date: 2019-05-31
Also published as: CN109842907A

Abstract

Provided are a method and device for transmitting data, which can reduce resource overheads. The method comprises: a first device receiving, on multiple logical channels of a radio link control (RLC) layer, multiple first copies of the same data package sent by a second device; the first device delivering, on at least part of the multiple logical channels, at least part of the multiple first copies to a packet data convergence protocol (PDCP) layer of the first device; and the first device sending a status report to the second device, wherein the status report is used for indicating at least one of the end of a first time period and the receiving condition of at least one copy of the first device, the first time period is a receiving time of the first device receiving the at least one copy, and the at least one copy comprises the first copies.

Description

Method and device for transmitting data

The present application claims priority to Chinese Patent Application No. PCT Application No. No. No. No. No. No. No. No. No.

Technical field

The present application relates to the field of communications, and more particularly to a method and apparatus for transmitting data in the field of communications.

Background technique

With the development of communication systems in the future, different services have different requirements for mobile communication systems. Some services have higher requirements on communication rates, and some services have higher requirements on delay, for example, high reliability and low latency communication ( Ultra reliable and low latency communications (URLLC) services have high reliability requirements. Therefore, when a packet arrives at the packet data convergence protocol (PDCP) layer, the PDCP layer can be used to improve the reliability of the transmission. The data packet is mapped to multiple logical channels of a radio link control (RLC) layer, and multiple identical copies are generated, and multiple identical copies are sent on multiple different carriers, so that different packets can be used. The carrier transmits the same data to improve the reliability of the transmitted data and can reduce the delay. If the data is not successfully transmitted on some carriers, retransmission can be performed, but the same data is transmitted on multiple carriers, and the transmission fails on each carrier. After that, continuing the retransmission will make the resource overhead larger.

Summary of the invention

The present application provides a method and apparatus for transmitting data, which can reduce resource overhead.

A first aspect provides a method for transmitting data, including: a first device receiving, on a plurality of logical channels of a radio link control RLC layer, a plurality of first copies of the same data packet sent by the second device; Transmitting, by the device, at least a portion of the first copy of the plurality of first copies to a packet data convergence protocol PDCP layer of the first device on at least a portion of the logical channels of the plurality of logical channels; the first device The second device sends a status report, where the status report is used to indicate at least one of a first time period end and a reception status of the at least one copy of the first device, where the first time period is the first The device receives a reception time of the at least one copy, the at least one copy including the first copy.

Therefore, in the embodiment of the present application, when the first device sends a status report to the second device, the second device does not send the copy in the first time period to the first device according to the status report or does not send the first device. The received copy can avoid unnecessary transmission of the second device, and unnecessary reception of the first device helps to reduce resource overhead.

Optionally, the first device may send a status report to the PDCP layer of the second device in the first PDCP layer, and the PDCP layer of the second device further sends the indication information to the multiple RLC layers of the second device to indicate that the first device has The received copy is no longer sent or canceled.

Optionally, the first time period may be a receiving time of the first device at the PDCP layer or may also be a receiving time of multiple logical channels of the first device at the RLC layer, where the first device is in multiple logical channels of the RLC layer. The receiving time may be the receiving time of each logical channel of the first device in the plurality of logical channels of the RLC layer or the total receiving time of the plurality of logical channels, which is not limited by the embodiment of the present application.

Optionally, in the embodiment of the present application, the second device does not send the copy that the first device has received to the first device, and it may be understood that the second device has started to send the copy that the first device has received, but has not yet The transmission is completed, in which case the second device no longer sends the portion of the copy that has not yet been sent.

In some implementations, each of the at least a portion of the first copies includes a PDCP number and an RLC number; the method further comprising: the first device at the PDCP layer according to each of the first copies The included PDCP number and the RLC number determine an RLC number of the to-be-received copy on the at least part of the logical channel; the first device transmits the RLC number of the to-be-received copy to the at least part of the logical channel of the RLC layer at the PDCP layer; The first device continues to receive a copy on the at least part of the logical channel of the RLC layer according to the RLC number of the to-be-received copy.

In some implementations, the status report is specifically used to indicate that the first device ends in the first time period of the PDCP layer, and the copy in the first time period is not used by the second device again. Sending or being canceled to be sent again, the copy in the first time period includes the first copy, or the status report is used to indicate the receiving status of the at least one copy of the first device in the PDCP layer, the first The copy that the device has received at the PDCP layer is not resent by the second device or is cancelled for resending.

Specifically, the status report may indicate that the first device ends in the first time period of the PDCP layer, such that when the second device receives the status report, the second device is at the PDCP layer to the RLC of the second device. The logical channel transmits the first indication information to indicate that the plurality of logical channels of the RLC layer of the second device no longer send or cancel the retransmission of the replica in the first time period of the PDCP layer. Because packet loss is allowed for the PDCP layer, when the receiving time of the PDCP layer ends, the second device does not send the copy in the first time period. Or, the first device sends a status report to the PDCP layer of the second device at the PDCP layer, where the status report is used to indicate that the first device is in the PDCP layer, if a preset number of copies of the PDCP layer of the first device have been received. The receiving status of the copy, for example, the status report may indicate a PDCP number, so that when the second device receives the status report at the PDCP layer, it may determine that the copy before the PDCP number is all based on the PDCP number indicated by the status report. Receiving, the first device transmits the second indication information to the multiple logical channels of the RLC layer of the first device at the PDCP layer, to indicate that the first device is not sent or cancelled again on the multiple logical channels. A copy that has been received by the PDCP layer, and the plurality of logical channels of the first device at the RLC layer are no longer sent or canceled to resend the copy that the first device has received at the PDCP layer.

In some implementations, at least a portion of the first copy has at least two first copies having different RLC numbers.

Specifically, when the first device sends multiple first copies to the PDCP layer of the first device on multiple logical channels of the RLC layer, the plurality of first copies may include different RLC numbers, such that the first device is in the PDCP. The layer determines that the RLC numbers of the replicas to be received on multiple logical channels are also different.

In some implementations, each of the at least a portion of the first copies has the same RLC number.

Specifically, when the first device sends multiple first copies to the PDCP layer of the first device on multiple logical channels of the RLC layer, the multiple first copies may include the same RLC number, which simplifies the first device. The PDCP layer determines the RLC numbers of the replicas to be received on the plurality of logical channels, and the RLC numbers of the plurality of logical channels to be received are the same.

In some implementations, the status report is specifically configured to indicate that the first device ends at the end of the first time period of the RLC layer and the at least one copy in the first time period, where The copy that has been received by the first device in the first time period is not sent again by the second device or is cancelled, or the status report is used to indicate that the first device is at the RLC layer. In the case of reception of at least one copy, the copy that the first device has received at the RLC layer is not resent or cancelled by the second device.

Optionally, the first device may send a status report to each of the plurality of logical channels of the RLC layer of the second device on each of the plurality of logical channels of the RLC layer, where the second device is The plurality of logical channels of the RLC layer determine, according to the status report, that the copy that the first device has received is no longer transmitted. Optionally, the first device may send a status report to a logical channel of the RLC layer of the second device in any one of the multiple logical channels of the RLC layer, and receive a status report by using one logical channel of the RLC layer of the second device. This status report can also be shared by other logical channels.

Optionally, when the first device sends a status report to multiple logical channels of the RLC layer of the second device in the multiple logical channels of the RLC layer, the status report may indicate that the first device is in the multiple logical channels of the RLC layer. The receiving situation of a time period, for example, which copies are received in the first time period and which copies are not received, the second device may not send the second device at the RLC layer multiple logical channels according to the status report indication. The received copy continues to send a copy of the second device that is not received on multiple logical channels of the RLC layer.

Optionally, when the first device sends a status report to multiple logical channels of the RLC layer of the second device in the multiple logical channels of the RLC layer, the status report may indicate that the first device is in the multiple logical channels of the RLC layer. The receiving condition of the at least one copy, for example, which copies are received and which are not received, the second device may not send the copy that the second device has received on the plurality of logical channels of the RLC layer according to the indication of the status report. Continue to send a copy of the second device that is not received on multiple logical channels of the RLC layer.

Optionally, when the first device receives the first copy that is sent by the first device on the first logical channel of the RLC layer at the PDCP layer, and also receives the first copy that is sent by the first device on the second logical channel of the RLC layer. Because the two copies are copies belonging to the same data packet, the first device receives only one of the first copies at the PDCP layer and discards the other first copy. Optionally, the first device reserves the first copy received in the first copy in the PDCP layer, and discards the first copy received later.

In some implementations, if the first device receives the first copy sent by the second device on any one of the multiple logical channels, the first device determines The first copy of each of the plurality of logical channels has been received.

Specifically, when the first device receives the first copy on any of the plurality of logical channels on the RLC layer, the first device determines the first copy on each of the plurality of logical channels of the RLC layer. It has been received that the plurality of logical channels of the first device at the RLC layer can share the state variables of the data packets, and when the first copy is received by one of the logical channels, the first copy of the other logical channels is also determined to have been received.

In a second aspect, a method for transmitting data is provided, the method comprising: the second device transmitting a plurality of the same data packet to a plurality of logical channels of a radio link control layer of the second device in a packet aggregation protocol PDCP layer a first copy; the second device sends a first copy corresponding to each logical channel to the first device on each of the plurality of logical channels; the second device receives the first device to send a status report, the status report is used to indicate at least one of a first time period of the first device and a reception status of the at least one copy of the first device, where the first time period is the A device receives a reception time of the at least one copy, the at least one copy including the first copy; and the second device determines a copy retransmission scheme according to the status report.

Therefore, in the embodiment of the present application, when the second device receives the first device sending status report, the second device does not send the copy in the first time period or the second device to the first device according to the status report. The first device has received the copy, so that unnecessary transmission of the second device can be avoided, and resource overhead can be reduced.

In some implementations, the status report is specifically used to indicate that the first device ends in the first time period of the PDCP layer; and the second device determines a copy retransmission scheme according to the status report, including: Determining, by the PDCP layer, that the replica in the first time period is not sent or canceled again according to the status report, where the second device is in the PDCP layer to the multiple of the second device The logical channel transmits the first indication information, where the first indication information is used to indicate that the replica in the first time period is no longer sent or canceled on the multiple logical channels.

In the embodiment of the present application, the first device may send a status report to the PDCP layer of the second device in the PDCP layer to indicate that the first device ends in the first time period of the PDCP layer, and the second device does not need to go to the PDCP layer again. The first device sends a copy in the first time period, and then the second device sends, in the PDCP layer, the first indication information to the multiple logical channels of the RLC layer of the second device, where the first indication information indicates that the second device is in multiple RLCs The layer no longer sends a copy of the first device in the first time period of the PDCP layer to the multiple logical channels of the RLC layer of the first device; or if the preset number of copies of the first device in the PDCP layer has been received or is in the first Before the end of the time period, the copy of the first time period has been received, and the status report indicates the receiving status of the copy, and the second device sends the first indication information to the multiple RLC layers of the second device at the PDCP layer. The first indication information is used to indicate that the copy of the first device that has been received by the first device at the PDCP layer is no longer sent or canceled, and the multiple logical channels of the second device at the RLC layer are no longer to the RLC layer of the first device. Multiple Series A channel transmission device has received the first copy.

In some implementations, the status report is specifically used to indicate a receiving situation of the first device at least one copy of the PDCP layer; and the second device determines a copy retransmission scheme according to the status report, including: The second device determines, according to the status report, that the second device does not send or cancel the retransmission of the copy that the first device has received at the PDCP layer; the second device is in the PDCP layer to the second device. The logical channel transmits the second indication information, where the second indication information is used to indicate that the replica that the first device has received at the PDCP layer is no longer sent or canceled on the multiple logical channels.

In some implementations, each of the plurality of first copies has the same RLC number; when the RLC numbers of the first copies are the same, the first device can be simplified in the PDCP layer calculation. The RLC number of the to-be-received copy of the plurality of logical channels of the device at the RLC layer, and the RLC numbers of the to-be-received copies of the plurality of logical channels of the first device at the RLC layer are the same.

In some implementations, at least two of the plurality of first copies have different RLC numbers, and when at least two of the plurality of first copies have different RLC numbers, The first device calculates the same to be received replica RLC number of the plurality of logical channels of the first device in the RLC layer. In some implementations, the status report is specifically configured to indicate that the first device ends at the first time period of the RLC layer and the second device is in the first time period of the RLC layer Receiving a situation; the second device determining a replica retransmission scheme according to the status report, including: the second device determining, according to the status report, that the second device does not send or cancels resending the first time period according to the status report A copy that has been received.

In some implementations, the status report is specifically used to indicate a receiving situation of the first device at least one copy of the RLC layer; and the second device determines, according to the status report, a copy retransmission scheme, including: The second device reports, at the RLC layer, according to the status report, that the copy that the first device has received at the RLC layer is no longer sent or cancelled.

In some implementations, the method further includes that the status report received by the second device on any one of the plurality of logical channels is applicable to all of the plurality of logical channels.

Specifically, the plurality of logical channels of the second device at the RLC layer may share a state variable of the replica, and the status report is received on any one of the plurality of logical channels of the RLC layer of the second device, indicating which copies are received. Which copies are not received, the other logical channels can also determine which copies are received and which copies are not received according to the status report, so that the second device does not send the first device in the multiple logical channels of the RLC layer. A copy that has been received within a period of time.

In a third aspect, an apparatus for transmitting data is provided for performing the method of any of the first aspect or the first aspect of the first aspect. In particular, the apparatus comprises means for performing the method of any of the first aspect or the first aspect of the first aspect described above.

In a fourth aspect, an apparatus for transmitting data is provided for performing the method of any of the possible implementations of the second aspect or the second aspect above. In particular, the apparatus comprises means for performing the method of any of the possible implementations of the second aspect or the second aspect described above.

In a fifth aspect, an apparatus for transmitting data is provided, the apparatus comprising: a transceiver (which may include a transmitter and a receiver), a memory, and a processor. Wherein the transceiver, the memory and the processor are in communication with each other via an internal connection path for storing instructions for executing instructions stored in the memory to control the receiver to receive signals and to control the transmitter to transmit signals The apparatus is caused to perform the method of the first aspect or any of the possible implementations of the first aspect.

In a sixth aspect, an apparatus for transmitting data is provided, the apparatus comprising: a transceiver (which may include a transmitter and a receiver), a memory, and a processor. Wherein the transceiver, the memory and the processor are in communication with each other via an internal connection path for storing instructions for executing instructions stored in the memory to control the receiver to receive signals and to control the transmitter to transmit signals The apparatus is caused to perform the method of any of the possible implementations of the second aspect or the second aspect.

In a seventh aspect, a system for transmitting data is provided, comprising the apparatus of the third aspect or any alternative implementation thereof, and the apparatus of the fourth aspect or any alternative implementation thereof. Optionally, the system comprises the apparatus of the fifth aspect or any alternative implementation thereof and the apparatus of the sixth aspect or any alternative implementation thereof.

In an eighth aspect, a computer readable storage medium is provided, the instructions being stored in the computer readable storage medium, when executed on a computer, causing the computer to perform any of the possible implementations of the first aspect or the first aspect The method in the way.

In a ninth aspect, a computer readable storage medium is provided, the instructions being stored in the computer readable storage medium, when executed on a computer, causing the computer to perform any of the possible implementations of the second aspect or the second aspect The method in the way.

In a tenth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the first aspect or the first aspect of the first aspect.

In an eleventh aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above-described second or second aspects.

In a twelfth aspect, the present application provides a communication chip in which an instruction is stored, when it is run on a first device or a second device, causing the first device or the second device to perform any of the aspects described above method.

DRAWINGS

FIG. 1 is a schematic diagram of a communication scenario provided by an embodiment of the present application.

2 is a schematic diagram of a structure of an air interface protocol stack provided by an embodiment of the present application.

FIG. 3 is a schematic diagram of a method for transmitting data according to an embodiment of the present application.

FIG. 4 is a schematic diagram of an RLC number provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of another RLC number provided by an embodiment of the present application.

FIG. 6 is a schematic diagram of still another RLC number provided by an embodiment of the present application.

FIG. 7 is a schematic diagram of another method for transmitting data according to an embodiment of the present application.

FIG. 8 is a schematic diagram of still another method for transmitting data according to an embodiment of the present application.

FIG. 9 is a schematic diagram of an apparatus for transmitting data according to an embodiment of the present application.

FIG. 10 is a schematic diagram of another apparatus for transmitting data according to an embodiment of the present application.

FIG. 11 is a schematic diagram of still another apparatus for transmitting data according to an embodiment of the present application.

FIG. 12 is a schematic diagram of still another apparatus for transmitting data according to an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, and a wideband code. Wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) System, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, wireless local area network (wireless local area) Network, WLAN) or the future fifth generation (5G) or new radio (NR) and so on.

The terminal device in the embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or User device. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or in the future evolution of the Public Land Mobile Network (PLMN) The terminal device and the like are not limited in this embodiment of the present application.

The network device in the embodiment of the present application may be a device for communicating with the terminal device, and the network device may be a Global System of Mobile communication (GSM) system or Code Division Multiple Access (CDMA). The access network device, for example, the access network device, may be a Base Transceiver Station (BTS), or may be a base station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system. It may also be an evolved base station (Evolutional NodeB, eNB or eNodeB) in the LTE system, or may be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or the network device may be a relay station, The embodiments of the present application are not limited to the access point, the in-vehicle device, the wearable device, and the network device in the future 5G network or the network device in the future evolved PLMN network.

In addition, in the embodiment of the present application, the numbers "first", "second", and the like are merely for distinguishing different objects. For example, in order to distinguish between different data packets, the scope of protection of the embodiments of the present application should not be limited. "Multiple" means two or more.

Please refer to FIG. 1 , which is a schematic diagram of a communication scenario according to an embodiment of the present application. As shown in FIG. 1, the terminal device 120 accesses the wireless network through the base station 110 to acquire a service of an external network (for example, the Internet) through a wireless network, or communicates with other terminal devices through a wireless network.

The interface between the terminal device and the access network device is called an air interface, and is also called a Uu port. Please refer to FIG. 2 , which is a schematic structural diagram of an air interface protocol stack according to an embodiment of the present application. As shown in FIG. 2, the air interface protocol stack includes but is not limited to a PDCP layer, an RLC layer, a media access control (MAC) layer, and a physical (PHY) layer. For the control plane, a radio resource control (RRC) layer is also included. The PDCP layer is the RRC layer on the upper layer of the control plane, and the network layer on the upper layer of the user plane, such as the Internet Protocol (IP) layer. The lower layer of the PDCP layer is the RLC layer. The PDCP layer can process RRC messages on the control plane and data packets on the user plane, such as IP packets. The PDCP layer can perform IP header compression to reduce the number of bits transmitted on the wireless interface. The PDCP layer is also responsible for controlling the integrity of the plane's encryption and transmission data. At the receiving end, the PDCP protocol performs the corresponding decryption and decompression operations. Each radio bearer of the terminal device is configured with one PDCP entity. The RCL layer is responsible for split/cascade, retransmission control, and retransmission detection. The RLC layer provides services for the PDCP layer, and each radio bearer of the terminal device is configured with an RLC entity. The MAC layer controls multiplexing of logical channels, retransmission of hybrid automatic repeat requests, and scheduling of uplinks and downlinks. The MAC layer serves the RLC layer in the form of a logical channel. PHY layer load management coding/decoding, modulation/demodulation, multi-antenna mapping, and other types of physical layer functions, the PHY layer serves the MAC layer in the form of a transport channel.

Optionally, in the process of integrity protection or encryption/decryption of the data packet, a parameter, a count (COUNT) is needed, and a sequence number (SN) may be used to indicate the count, and the serial number is used to indicate the next one. The order in which packets are to be received or sent in the entire service flow. The serial number can also be called a number. The PDCP SN is usually encapsulated in the header of the PDCP PDU. The RLC SN is usually encapsulated in the header of the RLC PDU. Specifically, the PDCP layer is maintained by the PDCP layer of the transmitting end and the receiving end, and the PDCP SN maintained by the PDCP layer of the transmitting end indicates the serial number of the PDCP data packet to be sent by the transmitting end at the PDCP layer, and the PDCP SN maintained by the PDCP layer of the receiving end. Indicates the sequence number of the PDCP PDU that the receiving end will receive next at the PDCP layer. The RLC SN maintained by the RLC layer of the transmitting end and the receiving end maintains the RLC SN maintained by the RLC layer of the transmitting end, and the RLC SN of the RLC PDU that the transmitting end sends at the RLC layer. The RLC SN maintained by the RLC layer of the receiving end indicates that the receiving end is in the RLC. The sequence number of the next RLC PDU to be received at the layer. When the data packet is in the PDCP layer, the PDCP SN is encapsulated in the header of the PDCP PDU. When the data packet is in the RLC layer, the RLC SN is encapsulated in the header of the RLC PDU.

In the embodiment of the present application, the different layer copies are collectively referred to as a copy, but in actual application, the copy of the different layer encapsulates the header of the corresponding layer, so different prefixes may be used for different headers, for example, a copy of the PDCP layer. It may be referred to as a PDCP protocol data unit (PDU), and a copy of the RLC layer may be referred to as an RLC PDU.

Different services have different requirements for mobile communication systems. Some services have higher requirements on communication rate. Some services have higher requirements on delay. For example, URLLC services have higher reliability requirements. Therefore, the sender is in PDCP. The layer needs to map the data packet to multiple logical channels of the RLC layer to generate multiple copies of the same data packet, so that the same data packet can be sent on each logical channel corresponding to the RLC layer, which can improve the reliability of the transmitted data. When multiple logical channels of the RLC layer are transmitted, multiple identical copies may be mapped and transmitted on multiple different carriers.

However, the transmission of the RLC layer does not allow packet loss. For example, the data packet mapping of the PDCP layer at the transmitting end generates 3 copies on 3 logical channels of the RLC layer, 3 logical channels can transmit the same copy, and the receiving end receives and transmits on 3 logical channels of the corresponding RLC layer. 3 data packets sent by the 3 logical channels of the RLC layer of the terminal. When the receiving end does not receive the copy sent by the transmitting end on the corresponding logical channel in a certain logical channel, the transmitting end needs to retransmit in the corresponding logical channel, but It is possible that the receiving end has received the copy in the other two logical channels. In order to avoid waste of resources, the method for transmitting data provided by the embodiment of the present application sends a certain copy to the receiving end when the receiving end receives the copy. Status report, so that the sender can determine whether to retransmit according to the status report, which can reduce unnecessary retransmissions and help save resource overhead.

The method for transmitting data provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings.

FIG. 3 shows a method for transmitting data provided by an embodiment of the present application, and the method 200 includes:

S210. The second device delivers, in a packet aggregation protocol PDCP layer, multiple first copies of the same data packet to multiple logical channels of the radio link control layer of the second device, where the multiple logical channels and the multiple The first copies correspond one-to-one, that is, the number of logical channels is the same as the number of first copies.

S220. The second device sends a first copy corresponding to each logical channel to the first device on each of the plurality of logical channels. The first device receives multiple first copies of the same data packet sent by the second device on multiple logical channels of the RLC layer, and the multiple logical channels are in one-to-one correspondence with the plurality of first copies.

Specifically, the number of logical channels of the RLC layer of the second device is the same as the number of logical channels of the RLC layer of the first device, and each logical channel of the second device in the RLC layer corresponds to the RLC of the first device. The logical channel of the layer transmits a first copy corresponding to each logical channel of the RLC layer. The process of transmission is performed on multiple carriers after processing by the physical layer. Specifically, a corresponding first copy can be transmitted on each carrier.

S230. The first device transmits at least part of the first copy of the plurality of first copies to a packet data convergence protocol PDCP layer of the first device on at least part of the logical channels of the multiple logical channels. The first device receives, at the PDCP layer, at least a portion of the first copy of the plurality of first copies of the plurality of logical channel hulls of the first device at the RLC layer.

It should be understood that the number of the plurality of first copies in S210 may be different from the number of the plurality of first copies in S220 and S230, for example, four copies of one identical data packet in S210 are in the RLC layer of the second device. The first device may receive the first copy on the three logical channels of the RLC layer, and the other first copy is lost. In this case, the first device is in S220. Three first copies are received on the three logical channels of the RLC layer.

It should be understood that when the first device counts at the PDCP layer which copies have received which copies are not received, in S230, the first device may send to the PDCP layer of the first device on multiple logical channels of the RLC layer. All of the first copies of the plurality of first copies. When the first device counts at the RLC layer which copies have received which copies are not received, in S230, the first device may send a PDCP to the first device in one of the plurality of logical channels of the RLC layer. The layer sends a first copy of the plurality of first copies, so the first device has discarded the redundant first copy of the plurality of first copies at the RLC layer, and the discarded first copy belongs to the same data . Therefore, the first device can send only a first copy to the PDCP layer of the first device at the RLC layer.

S240, the first device sends a status report to the second device, where the status report is used to indicate at least one of a first time period end and a receiving condition of the at least one copy of the first device, where the A time period is a receiving time at which the first device receives the at least one copy, the at least one copy including the first copy.

It should be understood that the status report is used to indicate the reception status of at least one copy, which may be: indicating which copies are received, which copies are not received, or may be: indicating that only the copy is not received, or may be: only indicating that The received copy is not limited in this embodiment of the present application. It should be understood that the first device sends a status report to the second device, where the first device sends a status report to the PDCP layer of the second device at the PDCP layer, or may also be a plurality of logical channels of the first device at the RLC layer. The multiple logical channel transmission status reports of the RLC layer of the two devices are not limited in this embodiment of the present application.

S250. The second device determines a replica retransmission scheme according to the status report.

Specifically, if the receiving status of the at least one copy indicated by the status report is different, the copy retransmission scheme determined by the second device is different, for example, if the status report is used to indicate that the first device ends at the first time period of the PDCP layer, When the second device receives the status report, the second device does not send the copy in the first time period; if the status report is used to indicate the receiving condition of the at least one copy of the first device in the PDCP layer, such that when the second device receives the status Reporting does not send a copy that the first device has received at the PDCP layer; if the status report is used to indicate that the first device ends at the first time period of the RLC layer, and at least one copy in the first time period of the RLC layer The receiving situation, such that when the second device receives the status report, the second device does not send the copy that the first device has received at the RLC layer in the first time period, and continues to send the copy that is not received at the RLC layer in the first time period. If the status report is used to indicate the reception of the at least one copy of the first device at the RLC layer, such that when the second device receives the status report, the second device does not send A device RLC layer has received a copy of the copy is not received continues to transmit to the first device in the RLC layer.

It should be understood that, in the embodiment of the present application, the second device may be a sending end, and the first device may be a receiving end. Optionally, the first device may be a terminal device, and the second device may be a network device; The first device may be a network device, and the second device may be a terminal device, which is not limited in this embodiment of the present application. Other first devices and second devices appearing in subsequent embodiments are similar, and the expressions "first" and "second" are not used to define the specific type of device.

Therefore, in the embodiment of the present application, the second device sends multiple first copies of the same data packet to the first device, the first device may send a status report to the second device, and the second device may determine that the second device does not need to send the information according to the status report. s copy. For example, if the status report indicates that the first time period of the PDCP layer of the first device ends, the second device does not send the copy in the first time period; for example, the status report indicates that the first device has received the PDCP layer. The second device does not send the copy that the first device has received at the PDCP layer. Further, if the first device ends at the first time period of the RLC layer, the status report is used to indicate the first time period. The second device only sends a copy that the first device does not receive in the first time period of the RLC layer; and, for example, the status report indicates that the first device does not receive the copy at the RLC layer, The second device only sends the copy that the first device does not receive at the RLC layer. Further, if the first device ends at the first time period of the RLC layer, the status report is used to indicate that the first time period is not received. A copy, the second device only sends a copy that was not received within the first time period. In this way, unnecessary transmission of the second device can be avoided, thereby reducing the overhead of resources.

The following is described in two cases. In the first case, the first device counts the received copy in the receiving buffer of the PDCP layer, and the second case is that the first device counts the received copy in the receiving buffer of the RLC layer.

Optionally, in the first case, the status report is specifically used to indicate that the first device ends in the first time period of the PDCP layer. S250. The method includes: the second device determines, according to the status report, that the second device does not send or cancel to resend the copy in the first time period. Transmitting, by the second device, the first indication information to the multiple logical channels of the second device in the PDCP layer, where the first indication information is used to indicate that the multiple logical channels are no longer sent or canceled again. Sending a copy of the first time period, the copy of the first time period including the first copy.

Optionally, in the first case, the status report is used to indicate that the first device receives the at least one copy of the PDCP layer. S250: The second device determines, according to the status report, that the second device does not send or cancel the retransmission of the copy that the first device has received at the PDCP layer, and the second device is in the PDCP layer to the second. The plurality of logical channels of the device transmit the second indication information, where the second indication information is used to indicate that the first device is not received or cancelled on the plurality of logical channels, and the first device has received the PDCP layer. A copy, the copy that the first device has received at the PDCP layer includes the first copy.

Optionally, in the first case, each of the at least part of the first copy includes a PDCP number and an RLC number; the method further includes: the first device is in the PDCP layer according to the The first copy includes a PDCP number and an RLC number to determine an RLC number of the at least part of the logical channel to be received; the first device transmits the to-be-received copy to the at least part of the logical channel of the RLC layer at the PDCP layer The RLC number; the device continues to receive the copy according to the RLC number of the to-be-received copy on at least part of the logical channel of the RLC layer, optionally, the first device may be based on at least part of the logical channel of the RLC layer. The RLC number of the to-be-received copy slides a receiving window of the first device on the at least part of the logical channel, for example, the first device may slide the upper boundary (starting position) of the receiving window to the RLC of the to-be-received copy The number, that is, the first device does not have to receive a copy of the RLC number of the to-be-received copy on the at least part of the logical channel, and only needs to receive the RLC number after the copy to be received. . The following is an example.

For example, as shown in FIG. 4, the number of expected replicas in the PDCP layer receiving buffer is s+2 (here, different s+2 replicas), and the PDCP number corresponding to s+2 replicas is Ns to N+1, assuming that the PDCP number of the first copy sent by the first logical channel received by the first device at the PDCP layer is Ns, and the RLC number is SN1, when the first device receives s+2 copies at the PDCP layer, In addition, if the copy of the PDCP number is N+2, the number of the RLC corresponding to the copy of the PDCP number N+2 is: (N+1)-(Ns)+SN1+1=SN1+s+2, The first device may transmit SN1+s+2 to the first logical channel of the first device at the PDCP layer, that is, the RLC number of the to-be-received copy of the first logical channel is SN1+s+2, optionally, the first The device may determine, on the first logical channel, that the next RLC number of the replica to be received is SN1+s+2; optionally, the first device may also use SN1+s+2 as the first logical channel in the first logical channel. The starting position of the receiving window on the upper, for example, assuming that 10 copies need to be received at a time on the first logical channel, then the start of the receiving window on the first logical channel Set SN1 + s + 2, the first device determines on the first logical channel to be received RLC copy number from 2 to SN1 + s + SN1 + s + 11.

For another example, based on the example of FIG. 4, s+2 can be understood as the length of the receiving window of the first device in the PDCP layer, and s+2 copies are copies corresponding to different data packets, when the first device is in the RLC layer. When the logical channels all transmit the same first copy to the PDCP layer of the first device, the first device selects only the first copy sent by one logical channel at the PDCP layer, for example, selects the earliest received copy, and the rest The first copy is discarded, and the PDCP number corresponding to the first copy is updated to be received. It is assumed that the receiving time of the receiving window of the PDCP layer is the first time period. After the first time period is exceeded, the first device is no longer Receiving a copy in the receiving window of the PDCP layer, that is, no longer receiving a copy of the PDCP number from Ns to N+1, but moving the receiving window of the PDCP layer, for example, the upper boundary of the receiving window of the PDCP layer Move to the position where the PDCP number is N+2, that is, the start position of the receiving window of the copy that the first device needs to receive next time in the PDCP layer is the position where the PDCP number is N+2, assuming the receiving window of the PDCP layer The length of the same, first Preparation of PDCP needs to continue receiving the copy number N + 2 to N + s + 3 in. Of course, in the actual application, the length of the receiving window of the first device in the PDCP layer is variable, which is not limited in this embodiment of the present application.

Optionally, when the first device determines, by the PDCP layer, the first RLC number of the to-be-received copy on the first logical channel by using the PDCP number and the RLC number of the first copy, the first device passes the PDCP number of the second copy at the PDCP layer. And the RLC number determines the first RLC number of the to-be-received copy on the first logical channel, and the first device, at the PDCP layer, uses the largest of the first RLC number and the second RLC number as the RLC of the to-be-received copy on the first logical channel. The first copy and the second copy are copies corresponding to different data packets. For example, in FIG. 5, SN1 is the RLC number of the first copy, Ns is the PDCP number of the first copy, and the first logic determined by SN1 and Ns The RLC number of the to-be-received copy of the channel is SN1+s+2 (derived by (N+1)-(Ns)+SN1+1); SN1+n is the RLC number of the second copy, and N+3 is the second The PDCP number of the replica, the RLC number of the to-be-received copy of the first logical channel determined by SN1+n and N+3 is SN1+n-1 (by SN1+n-((N+3)-(N+1)) +1 is derived), then SN1+s+2 and SN1+n-1 can be the largest as the RLC number of the actual to-be-received copy on the first logical channel.

For another example, as shown in FIG. 5, the number of copies that need to be received in the PDCP layer receiving buffer is s+2 (here, different s+2 copies), and the PDCP numbers corresponding to s+2 copies are NS to N. +1, assuming that the first RLC number of each of the plurality of first copies is the same, and the PDCP number of the first copy is Ns, when the first device transmits a first to the PDCP layer on the first logical channel of the RLC layer a copy, the first device transmits a first copy to the PDCP layer on the second logical channel of the RLC layer. Of course, the first copy transmitted on the two logical channels can be delivered simultaneously or in the order of the two. The first copy has the RLC number of SN1 and the PDCP number is Ns. When the first device receives the s+2 copies at the PDCP layer and needs to continue receiving the copy with the PDCP number N+2, the PDCP number is The number of the RLC corresponding to the copy of N+2 is (N+1)-(Ns)+SN1+1=SN1+s+2, and the first device may be in the PDCP layer to the first logical channel and the first device of the first device. The two logical channels respectively transmit SN1+s+2, that is, the RLC number of the to-be-received copy of the first logical channel and the second logical channel is SN 1+s+2, such that the first device can also use SN1+s+2 as the starting position of the receiving window on the first logical channel, and the first device can use SN1+s+2 as the second logical channel. The starting position of the receiving window on the top. That is to say, when different logical channels transmit the same first copy, the RLC numbers included in the first copy are the same, and the first device finally determines that the RLC numbers of the to-be-received copies on different logical channels are the same.

Based on the example of FIG. 5, when the RLC numbers of the two first copies in the plurality of first copies are different, that is, as shown in FIG. 6, the PDCP number of the first copy is Ns, and the first device is in the RLC layer. The RLC number of the first copy transmitted on a logical channel is SN1, the PDCP number is Ns, and the RLC number of the first copy transmitted by the first device on the second logical channel of the RLC layer is SN2, and the first device determines: PDCP The number of the RLC on the first logical channel corresponding to the copy numbered N+2 is (N+1)-(Ns)+SN1+1=SN1+s+2; the copy corresponding to the copy of the PDCP number N+2 The number of the RLC on the two logical channels is (N+1)-(Ns)+SN2+1=SN2+s+2; then the first device can transmit SN1+s to the first logical channel of the first device at the PDCP layer. +2, that is, the RLC number of the to-be-received copy of the first logical channel is SN1+s+2; then the first device can transmit SN2+s+2 to the second logical channel of the first device at the PDCP layer, that is, the first The RLC number of the to-be-received copy of the two logical channels is SN2+s+2. In this way, the first device can also use SN1+s+2 as the starting position of the receiving window on the first logical channel, and the first device and SN2+s+2 can be used as the receiving window on the second logical channel. starting point. That is to say, when different logical channels transmit the same first copy, when the RLC numbers included in the first copy are different, the first device finally determines that the RLC numbers of the to-be-received copies on different logical channels are also different.

It should be understood that, in the embodiment of the present application, the first device has a receiving window for receiving a copy at the PDCP layer, and a receiving window for receiving the copy also exists on multiple logical channels of the RLC layer.

Optionally, in the second case, the status report is specifically used to indicate that the first device ends at the end of the first time period of the RLC layer and the at least one copy of the first time period S250. The method includes: the second device determines, according to the status report, that the second device does not send or cancel to resend the already received copy in the first time period.

Optionally, in the second case, the status report is used to indicate the reception status of the at least one copy of the first device in the RLC layer. S250. The method includes: the second device reports, according to the status report, that the second device does not send or cancels, at the RLC layer, the replica that the first device has received at the RLC layer.

Optionally, in the second case, each of the plurality of first copies has the same RLC number, if the first device receives on any one of the multiple logical channels a first copy sent by the second device, the first device determining that a first copy of each of the plurality of logical channels has been received.

Specifically, the plurality of logical channels of the first device at the RLC layer may respectively maintain a state variable of one copy, or the plurality of logical channels of the first device at the RLC layer jointly maintain a shared state variable of one copy. When the first device receives the first copy transmitted by the second device on any of the plurality of logical channels, it is considered that the first copy on each of the plurality of logical channels is received. When the plurality of logical channels of the RLC layer of the first device respectively maintain a state variable of a replica, the state of the first replica in the state variables respectively maintained by the plurality of logical channels is updated to be received, and the first device may be in the RLC. Each status report is sent to the second device on each of the plurality of logical channels of the layer, each status report is used to indicate the reception status of at least one copy of each logical channel, or to indicate each logical channel The end of the first time period and the reception of at least one copy in the first time period; when the plurality of logical channels of the RLC layer of the first device jointly maintain a shared state variable of a copy, then the shared state variable The status of the first copy is updated to have been received, and the first device may send a status report at the RLC layer, the status report is used to indicate the reception status of the at least one copy of the RLC layer, or to indicate the first time period of the RLC layer. Receiving and receiving the at least one copy of the first time period. It should be understood that the first partial logical channel may be a logical channel, and the first partial copy may be a first copy, and the first partial logical channel may also be multiple logical channels, and the first partial copy may be a plurality of first copies.

Optionally, the RLC number of each of the plurality of first copies is the same, and the method 200 further includes: receiving, by the second device, any one of the plurality of logical channels The status report applies to all of the plurality of logical channels.

Specifically, the plurality of logical channels of the second device may respectively maintain a state variable of one copy, or the plurality of logical channels of the second device jointly maintain a shared state variable of one copy. When the second device receives the status report sent by the first device on any of the plurality of logical channels, it is considered that each of the plurality of logical channels shares the status report, and the status report indicates that the copy 1 is Copy 2 and copy 3 have been received. When the plurality of logical channels of the RLC layer of the second device respectively maintain a state variable of a copy, the states of the copy 1, copy 2, and copy 3 in the state variables respectively maintained by the plurality of logical channels are updated to be sent; When the plurality of logical channels of the RLC layer of the second device jointly maintain the shared state variable of one copy, the status of the copy 1, copy 2, and copy 3 in the shared state variable is updated to have been transmitted.

In combination with the first case and the second case, each of the at least a portion of the first copies includes a PDCP number and an RLC number; when the first device is at the first logical channel of the RLC layer to the first device When the first copy transmitted by the PDCP layer includes the PDCP number and the RLC number, the first device transmits the RLC number to the logical channels other than the first logical channel in the PDCP layer, so that the first device is On other logical channels, it can be determined that the first copy has been received by the PDCP layer of the first device, and the first device updates the status of the first copy to have been received on multiple logical channels of the RLC layer.

FIG. 7 shows a method 300 for transmitting data provided by an embodiment of the present application. The method 300 includes:

S301. A data radio bearer (DRB) of the second device at the PDCP layer may be mapped to two PDCP PDUs, and each of the two logical channels (logical channel 1 and logical channel 2) of the RLC layer respectively Corresponds to one PDCP PDU. That is, two PDCP PDUs can be two copies of the same DRB.

It should be understood that, for convenience of description, two logical channels of the RLC layer of the first device and two logical channels of the RLC layer of the second device are used as an example in FIG. 7 , but the embodiment of the present application is not limited thereto.

S302. The second device adds two PDCP PDUs to the RLC packet header on the two logical channels of the RLC layer, and forms two RLC PDUs to send to the two logical channels of the RLC layer of the first device, and the packets of the two RLC PDUs. The RLC SN included in the header (which may be referred to as the aforementioned RLC number) may be different, in other words, the RLC SN in the two replica headers of the RLC layer may be different for the same DRB mapping. Optionally, the sending, by the second device, the RLC PDUs on the two logical channels of the RLC layer of the RLC layer to the two logical channels of the RLC layer of the first device may be sent simultaneously or sequentially. .

It should be understood that, in S302, the process for the second device to send the two PDCP PDUs to the first device may be: the second device sends the PD layer to the RLC layer, and the second device sends the MAC layer corresponding to the RLC layer at the RLC layer. Sending, the second device is sent to the PHY layer of the second device at the MAC layer, and the second device is sent to the PHY layer of the first device by the carrier at the PHY layer, and the first device sends the MAC layer to the MAC layer of the first device at the PHY layer, A device is sent to the RLC layer of the first device at the MAC layer, and the first device is sent to the PDCP layer of the first device at the RLC layer. The MAC layer and the PHY layer are not the focus of the embodiments of the present application. Therefore, the embodiment of the present application is only described by taking the PDCP layer and the RLC layer as an example.

S303. The first device receives the RLC PDUs sent by the second device on the two logical channels of the RLC layer on the two logical channels of the RLC layer, and the first device decapsulates the headers of the two RLC PDUs on the two logical channels to obtain two a PDCP PDU, the first device transmits two PDCP PDUs to the PDCP layer of the first device on two logical channels, and the header of each PDCP PDU includes an RLC SN in addition to the PDCP SN, for example, in FIG. RLC SN1 and RLC SN2, RLC SN1 is different from RLC SN2. The PDCP PDU that the first device transmits to the PDCP layer on the logical channel 1 of the RLC layer includes the RLC SN1, and the PDCP transmitted by the first device at the logical channel 2 of the RLC layer to the PDCP layer. The PDU includes the RLC SN2.

S304. After the first device acquires two PDCP PDUs sent by the first device on the two logical channels of the RLC layer, the first device determines that the first device is at the RLC layer according to the RLC SN and the PDCP SN included in each PDCP PDU. Logical channel 1 and logical channel 2 RLC SN of the RLC PDU to be received, for example, determining that the RLC SN of the RLC PDU of the logical channel 1 to be received is RLC SN3, and the RLC SN of the RLC PDU of the logical channel 2 to be received is RLC SN4 .

S305. The first device ends at a first time period of receiving a PDCP PDU of the PDCP layer or a preset number of PDCP PDUs of the PDCP layer are received, for example, the first device is expected to receive 10 in a first time period of the PDCP layer. a PDCP PDU (10 different copies), the first device sends a status report to the second device at the PDCP layer. Optionally, the first device sends a status report to the second device at the PDCP layer. The PDCP layer sends the status report to the RLC layer of the first device, the RLC layer of the first device sends the status report to the RLC layer of the second device, and the RLC layer of the second device sends the status report to the PDCP layer of the second device.

It should be understood that S304 may be before or after S305, and the embodiment of the present application does not limit this.

S306. When receiving the status report, the PDCP layer of the second device determines that the first time period ends or the PDCP layer of the PDCP layer has received a preset number of PDCP PDUs. If the second device determines that the first time period of the PDCP layer of the first device ends, the second device does not send the copy in the first time period to the first device, because for the first device, when the first time period ends No matter whether the copy is received or not, it is no longer received. Therefore, the second device does not send the copy in the first time period, which can reduce the resource overhead. If the second device determines that the PDCP layer of the first device has been received by the preset number of PDCP PDUs, the second device does not send the PDCP PDU that the first device has received to the first device, thereby avoiding unnecessary resource waste.

S307. The second device transmits, by the PDCP layer, the first indication information to the two logical channels of the RLC layer of the second device, where the first indication information is used to indicate a PDCP PDU that does not need to be retransmitted at the RLC layer. Optionally, the second device transmits the first indication information to one of the logical channels of the RLC layer of the second device at the PDCP layer, so that the two logical channels can share the first indication information.

S308. The second device cancels sending or retransmitting the corresponding RLC PDU of the PDCP PDU at the RLC layer. For example, the second device does not send the RLC PDU on some logical channels of the RLC layer, but is sent on other logical channels. The RLC PDU has been received by the first device, and the second device cancels the transmission of the RLC PDU on the logical channels. For example, if the RLC PDU has been sent, and the first device also receives the RLC PDU, the second device The device cancels the retransmission on the logical channel.

S309. The first device transmits, by the PDCP layer, the RLC SN of the RLC PDU to be received on the logical channel of the determined RLC layer to the two logical channels of the RLC layer of the second device by using the first message.

S310. After acquiring the first message on the two logical channels of the RLC layer, the second device continues to receive the RLC PDU according to the RLC SN3 and the RLC SN4 carried in the first message.

It should be understood that, in the embodiment of the present application, before or after S309, S310, and S305, S306, S307, and S308, that is, in the embodiment of the present application, the first device transmits the first message to the RLC layer of the first device at the PDCP layer. The order may be not limited to the order in which the first device sends a status report to the second device at the PDCP layer.

It should also be understood that there are two identical steps in the method 300. For example, there are two S302s, which do not indicate that the two steps are performed at the same time, and there may be a sequence, which is not limited by the embodiment of the present application.

In a possible implementation, in S303, when the first device is the same as the RLC SN included in the PDCP PDU sent by the logical channel 2 of the RLC layer, the PDCP PDU sent by the logical channel 1 of the RLC layer is the same as the RLC SN included by the first device at the logical channel 2 of the RLC layer. Then, in S304, the first device determines that the RLC SN of the logical channel 1 and the logical channel 2 RLC PDU to be received is also the same in the PDCP layer. In other words, if RLC SN1=RLC SN2, RLC SN3=RLC SN4.

FIG. 8 shows another method 500 for transmitting data according to an embodiment of the present application. The method 500 includes:

S401, the same as S301.

S402, the same as S302.

Optionally, in S402, the dotted line indicates that the transmitted RLC PDU is lost.

S403. The first device transmits the received RLC PDU to the PDCP layer of the first device on the two logical channels of the RLC layer. If the RLC PDU is not received on the logical channel 2, the first device does not need to transmit to the PDCP layer of the first device. .

S404. The first device separately maintains a state variable of the to-be-received copy on each of the two logical channels of the RLC layer. When the first device receives one RLC PDU on the logical channel 1 of the RLC layer, the other device loses In the case of a packet, the first device updates the value corresponding to the state variable corresponding to the RLC PDU on the two logical channels of the RLC layer to have been received.

For example, the first device maintains a state variable of a replica with an initial value of 0000000000 on each of the two logical channels of the RLC layer, and the RLC SN of the corresponding RLC PDU of the 0000000000 is 0, 1, 2, 3, 4 5, 6, 7, 8, 9; when the first device receives the RLC SN of 3 on any one of the logical channels, the first device updates the state variables of the replicas on both logical channels to 00000000.

S405. If the first device ends at the first time period of the RLC layer, the first device sends a status report to the two logical channels of the RLC layer of the corresponding second device on the two logical channels of the RLC layer. The report indicates the end of the first time period and the receipt of the copy during the first time period. If the first device has received a preset number of copies in the RLC layer, the first device sends a status report to the two logical channels of the RLC layer of the corresponding second device on the two logical channels of the RLC layer, the status report. Indicates that a preset number of copies have been received.

Optionally, the first device sends the status report to the two logical channels of the corresponding second device RLC layer on the two logical channels of the RLC layer, including: the first device is pre-prescribed on the two logical channels of the RLC layer. The set time flows to the second device to send status reports on the two logical channels of the RLC layer.

S406. The second device determines, on the two logical channels of the RLC layer, the replica that the first device has received according to the status report, and updates the state variable of the replica that the first device has received.

For example, the second device maintains a state variable of a copy of the initial value of 0000000000 in each of the two logical channels of the RLC layer, and the RLC SN of the RLC PDU corresponding to 0000000000 is 0, 1, 2, 3, respectively. 4,5,6,7,8,9; when the second device receives the status report indicating that the RLC SN of the RLC PDU received by the first device at the RLC layer is 2, 3, 5, 8, the second device will RLC The state variables of the copies of the two logical channels of the layer are updated to 0011010010.

S407. The second device determines, according to the status report, a copy that the first device has received at the RLC layer, and the second device determines, at the RLC layer, that the first device that has not been transmitted has received the copy, and cancels the resending or heavy of the corresponding copy. pass.

In a possible implementation, in S404, the first device maintains a state variable of a shared to-be-received copy on two logical channels of the RLC layer, and the first device receives one on the logical channel 1 of the RLC layer. The RLC PDU, when another packet is lost, the first device updates the value corresponding to the state variable of the shared pending replica to be received. In S405, the first device sends only one status report to the RLC layer of the second device in the two logical channels of the RLC layer, and the first device does not need to send two separately on the two logical channels of the RLC layer. status report. For example, the first device maintains a shared state variable of the to-be-received copy whose initial value is 0000000000, and the RLC SN of the RLC PDU corresponding to 0000000000 is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9; When the first device receives the RLC SN of 3 on any logical channel, the first device updates the shared state variable of the to-be-received replica to 00000000.

In a possible implementation, in S406, the second device maintains a shared state variable of the to-be-received replica on the two logical channels of the RLC layer, and the second device receives the first on any logical channel of the RLC layer. A status report sent by the device, which applies to all logical channels of the second device at the RLC layer.

For example, the second device maintains a shared state variable of a replica with an initial value of 0000000000 on two logical channels of the RLC layer, and the RLC SN of the RLC PDU corresponding to 0000000000 is 0, 1, 2, 3, 4, 5, 6, respectively. 7,8,9; when the second device receives the status report indicating that the RLC SN of the RLC PDU received by the first device at the RLC layer is 2, 3, 5, 8, the second device updates the shared state variable of the copy to 0011010010, that is, the second device only needs to continue to send RLC PDUs whose RLC SN is 0, 1, 4, 6, 7, 9 at the RLC layer.

The method for transmitting data according to an embodiment of the present application is described in detail above with reference to FIG. 1 to FIG. 8. Hereinafter, an apparatus for transmitting data according to an embodiment of the present application will be described in detail with reference to FIG. 9 to FIG.

FIG. 9 shows an apparatus 500 for transmitting data according to an embodiment of the present application. The apparatus 500 includes:

The receiving unit 510 is configured to receive, on a plurality of logical channels of the radio link control RLC layer, a plurality of first copies of the same data packet sent by the second device;

The transmitting unit 520 is configured to deliver at least part of the first copy of the plurality of first copies to the packet data convergence protocol PDCP layer of the device on at least part of the logical channels of the multiple logical channels;

The sending unit 530 is configured to send, to the second device, a status report, where the status report is used to indicate at least one of a first time period end of the device and a receiving condition of at least one copy of the device, The first time period is a receiving time at which the receiving unit receives the at least one copy, the at least one copy including the first copy.

As an optional embodiment, each of the at least part of the first copies includes a PDCP number and an RLC number; the apparatus 500 further includes: a first determining unit, configured to perform each of the PDCP layers according to the Determining, by the first copy, a PDCP number and an RLC number, an RLC number of the to-be-received copy on the at least part of the logical channel; the transmitting unit 520 is further configured to: deliver the, at the PDCP layer, the at least part of the logical channel of the RLC layer The RLC number of the to-be-received copy; the receiving unit 510 is further configured to: continue to receive the copy according to the RLC number of the to-be-received copy on at least part of the logical channel of the RLC layer.

In an optional embodiment, the status report is specifically used to indicate that the device ends in the first time period of the PDCP layer, and the copy in the first time period is not re-transmitted by the second device or Is canceled to be sent again, or the status report is used to indicate the reception status of the device at least one copy of the PDCP layer, and the copy that the receiving unit has received at the PDCP layer is not re-transmitted by the second device or Was canceled and sent again.

As an optional embodiment, at least part of the first copy has at least two first copies having different RLC numbers.

As an optional embodiment, each of the at least a portion of the first copies has the same RLC number.

In an optional embodiment, the status report is specifically used to indicate that the first time period of the RLC layer ends and the reception of the at least one copy in the first time period, in the first time period. The copy that has been received by the receiving unit is not resent or cancelled by the second device, or the status report is used to indicate the receiving status of the device at least one copy of the RLC layer. The copy that the receiving unit has received at the RLC layer is not resent by the second device or is cancelled again.

As an optional embodiment, the apparatus 500 further includes: a second determining unit, configured to send, when the receiving unit receives the second device on any one of the multiple logical channels, A first copy determining that a first copy of each of the plurality of logical channels has been received.

It should be understood that the apparatus 500 herein is embodied in the form of a functional unit. The term "unit" as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (eg, a shared processor, a proprietary processor, or a group) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and/or other suitable components that support the described functionality. In an alternative example, those skilled in the art may understand that the device 500 may be specifically the first device in the foregoing method embodiment, and the device 500 may be used to execute various processes corresponding to the first device in the foregoing method embodiment and/ Or steps, to avoid repetition, will not be repeated here.

FIG. 10 shows an apparatus 600 for transmitting data according to an embodiment of the present application. The apparatus 600 includes:

The transmitting unit 610 is configured to deliver, by the packet aggregation protocol PDCP layer, multiple first copies of the same data packet to multiple logical channels of the radio link control layer of the device.

The sending unit 620 is configured to send, to each of the multiple logical channels, a first copy corresponding to each logical channel to the first device.

The receiving unit 630 is configured to receive a status report sent by the first device, where the status report is used to indicate that the first time period of the first device ends and the at least one copy of the first device is received. In one aspect, the first time period is a receiving time that the first device receives the at least one copy, and the at least one copy includes the first copy.

The determining unit 640 is configured to determine a replica retransmission scheme according to the status report.

As an optional embodiment, the status report is specifically used to indicate that the first device ends in the first time period of the PDCP layer; the determining unit 640 is specifically configured to: determine, according to the status report, at the PDCP layer No longer sending or canceling the resending of the copy in the first time period;

The transmitting unit 610 is further configured to: transmit, by the PDCP layer, first indication information to the multiple logical channels of the second device, where the first indication information is used to indicate that the multiple logical channels are no longer Send or cancel the copy of the first time period again.

As an optional embodiment, the status report is specifically used to indicate the receiving situation of the at least one copy of the first device in the PDCP layer; the determining unit 640 is specifically configured to: determine, according to the status report, that the PDCP layer does not Retransmitting or canceling resending the copy that the first device has received at the PDCP layer; the transmitting unit 610 is further configured to: transmit, by the PDCP layer, the second indication information to the multiple logical channels of the second device, where The second indication information is used to indicate that the copy that the first device has received at the PDCP layer is no longer sent or cancelled on the multiple logical channels.

As an optional embodiment, at least two first copies of the plurality of first copies have different RLC numbers.

As an optional embodiment, each of the plurality of first copies has the same RLC number.

In an optional embodiment, the status report is specifically used to indicate that the first device ends at the first time period of the RLC layer and the second device is in the first time period of the RLC layer. The determining unit 640 is configured to: determine, according to the status report, that the already received copy in the first time period is no longer sent or canceled at the RLC layer.

As an optional embodiment, the status report is specifically used to indicate the receiving situation of the at least one copy of the first device in the RLC layer; the determining unit 640 is specifically configured to: report, according to the status, no longer in the RLC layer Sending or canceling the retransmission of the copy that the first device has received at the RLC layer.

As an optional embodiment, the status report received by the receiving unit 630 on any one of the multiple logical channels is applicable to all of the multiple logical channels.

As an optional embodiment, each of the plurality of first copies includes a PDCP number and an RLC number.

It should be understood that the apparatus 600 herein is embodied in the form of a functional unit. The term "unit" as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (eg, a shared processor, a proprietary processor, or a group) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and/or other suitable components that support the described functionality. In an alternative example, those skilled in the art may understand that the device 600 may be specifically the second device in the foregoing method embodiment, and the device 600 may be used to execute various processes corresponding to the second device in the foregoing method embodiment and/ Or steps, to avoid repetition, will not be repeated here.

The device 500 or the device 600 and the first device or the second device in the method embodiment are completely corresponding to each other, and corresponding steps are performed by the corresponding unit. For example, the transceiver unit method performs the transmitting and receiving steps in the method embodiment, and other steps besides receiving and receiving may be performed. Executed by the processing module. For the function of the specific module, reference may be made to the corresponding method embodiment, which is not described in detail.

The first device and the second device of the foregoing solutions have the functions of implementing the corresponding steps performed by the first device and the second device in the foregoing method; the functions may be implemented by using hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions; for example, the transmitting unit may be replaced by a transmitter, the receiving unit may be replaced by a receiver, and other units such as a determining unit may be replaced by a processor and executed separately Transceiver operations and associated processing operations in various method embodiments.

FIG. 11 shows another apparatus 700 for transmitting data provided by an embodiment of the present application. The apparatus 700 includes a processor 710, a transceiver 720, and a memory 730. The processor 710, the transceiver 720, and the memory 730 communicate with each other through an internal connection path. The memory 730 is configured to store instructions, and the processor 710 is configured to execute instructions stored in the memory 730 to control the transceiver 720 to send signals and / or receive signals.

The transceiver 720 is configured to receive, on a plurality of logical channels of the radio link control RLC layer, a plurality of first copies of the same data packet sent by the second device; the processor 710 is configured to use at least the multiple logical channels. Passing at least part of the first copy of the plurality of first copies to a packet data convergence protocol PDCP layer of the device on a portion of the logical channel; the transceiver 720 is further configured to send a status report to the second device, the status Reporting at least one of indicating a end of a first time period of the device and a receipt of at least one copy of the device, the first time period being a receiving time at which the receiving unit receives the at least one copy, The at least one copy includes the first copy.

It should be understood that the device 700 may be specifically the first device in the foregoing method embodiment, and may be used to perform various steps and/or processes corresponding to the first device in the foregoing method embodiment. Optionally, the memory 1130 can include read only memory and random access memory and provides instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory can also store information of the device type. The processor 710 can be configured to execute instructions stored in a memory, and when the processor 710 executes instructions stored in the memory, the processor 710 is configured to perform the steps of the method embodiment corresponding to the first device and / or process.

FIG. 12 shows another apparatus 800 for transmitting data provided by an embodiment of the present application. The apparatus 800 includes a processor 8810, a transceiver 820, and a memory 830. The processor 810, the transceiver 820, and the memory 830 communicate with each other through an internal connection path. The memory 830 is configured to store instructions, and the processor 810 is configured to execute instructions stored in the memory 830 to control the transceiver 820 to send signals and / or receive signals.

The processor 810 is configured to: at the packet aggregation protocol PDCP layer, deliver multiple first copies of the same data packet to multiple logical channels of the radio link control layer of the device; and the transceiver 820 is configured to be in the multiple Transmitting, by each of the logical channels, a first copy corresponding to each logical channel to the first device; the transceiver 820 is further configured to receive a status report sent by the first device, where the status report is used to indicate the At least one of a first time period of the first device and a receiving condition of the at least one copy of the first device, the first time period is a receiving time of the first device receiving the at least one copy, The at least one copy includes the first copy; the processor 810 is further configured to determine a copy retransmission scheme according to the status report.

It should be understood that the device 800 may be specifically the second device in the foregoing method embodiment, and may be used to perform various steps and/or processes corresponding to the second device in the foregoing method embodiment. Optionally, the memory 830 can include read only memory and random access memory and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory can also store information of the device type. The processor 810 can be configured to execute instructions stored in a memory, and when the processor 810 executes instructions stored in the memory, the processor 810 is configured to perform the various steps of the method embodiment corresponding to the first device and / or process.

It should be understood that the transceiver described above can include a transmitter and a receiver. The transceiver may further include an antenna, and the number of antennas may be one or more. The memory can be a separate device or integrated into the processor. The above various devices or parts of the device can be integrated into the chip for implementation, such as integration into a baseband chip.

It should also be understood that, in the embodiment of the present application, the processor of the foregoing device may be a central processing unit (CPU), and the processor may also be another general-purpose processor, a digital signal processor (DSP). ), application specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The transceiver can implement signal transmission and reception under the control or driving of the processor. When the processor needs to send or receive any signal, the transceiver can be driven or called to effect the transmission or reception. The transceiver may include a frequency modulation and demodulation unit, and may also include necessary amplifiers, filters, transformers, etc., which are not limited in this embodiment.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software units in the processor. The software unit can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in a memory, and the processor executes instructions in the memory, in combination with hardware to perform the steps of the above method. To avoid repetition, it will not be described in detail here.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it 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 the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The available media can be magnetic media (eg, a floppy disk, a hard disk, Magnetic tape), optical medium (for example, DVD), or semiconductor medium (such as solid state disk (SSD)).

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A method for transmitting data, comprising:

The first device receives, on a plurality of logical channels of the radio link control RLC layer, a plurality of first copies of the same data packet sent by the second device;

Transmitting, by the first device, at least part of the first copy of the plurality of first copies to a packet data convergence protocol PDCP layer of the first device on at least part of the logical channels of the plurality of logical channels;

Sending, by the first device, a status report to the second device, where the status report is used to indicate at least one of a first time period end and a receiving condition of the at least one copy of the first device, the first time The segment is a receiving time at which the first device receives the at least one copy, the at least one copy including the first copy.
The method of claim 1, wherein each of the at least a portion of the first copies comprises a PDCP number and an RLC number, the method further comprising:

Determining, by the PDCP layer, the RLC number of the to-be-received copy on the at least part of the logical channel according to the PDCP number and the RLC number included in each of the first copies;

Transmitting, by the PDCP layer, the RLC number of the to-be-received copy to the at least part of the logical channel of the RLC layer;

The first device continues to receive a copy on the at least part of the logical channel of the RLC layer according to the RLC number of the to-be-received copy.
The method according to claim 1 or 2, wherein the status report is specifically used to indicate that the first device ends in the first time period of the PDCP layer, and the copy in the first time period Not being resent by the second device or being cancelled again, or

The status report is specifically used to indicate that the first device receives the at least one copy of the PDCP layer, and the copy that the first device has received at the PDCP layer is not resent or cancelled by the second device. send.
The method according to any one of claims 1 to 3, wherein at least two of the first copies have at least two first copies having different RLC numbers.
The method according to any one of claims 1 to 3, wherein each of the at least a portion of the first copies has the same RLC number.
The method according to claim 5, wherein the status report is specifically configured to indicate that the first device ends at the first time period of the RLC layer and at least one copy of the first time period Receiving a situation, the copy that has been received by the first device in the first time period is not resent or re-sent by the second device, or

The status report is used to indicate the reception status of the at least one copy of the first device in the RLC layer, and the copy that the first device has received at the RLC layer is not resent or cancelled by the second device. .
The method according to claim 5 or 6, wherein the method further comprises:

And if the first device receives the first copy sent by the second device on any one of the multiple logical channels, the first device determines, in each of the multiple logical channels The first copy of the logical channels has been received.
A method for transmitting data, comprising:

Transmitting, by the second device, a plurality of first copies of the same data packet to a plurality of logical channels of the radio link control layer of the second device in a packet aggregation protocol PDCP layer;

Transmitting, by the second device, a first copy corresponding to each logical channel to the first device on each of the plurality of logical channels;

Receiving, by the second device, a status report sent by the first device, where the status report is used to indicate at least one of ending of a first time period of the first device and receiving status of at least one copy of the first device And the first time period is a receiving time that the first device receives the at least one copy, and the at least one copy includes the first copy;

The second device determines a replica retransmission scheme according to the status report.
The method according to claim 8, wherein the status report is specifically configured to indicate that the first device ends at the first time period of the PDCP layer;

Determining, by the second device, the replica retransmission scheme according to the status report, including:

The second device determines, according to the status report, that the second device does not send or cancel to resend the copy in the first time period;

Transmitting, by the second device, the first indication information to the multiple logical channels of the second device in the PDCP layer, where the first indication information is used to indicate that the multiple logical channels are no longer sent or canceled again. Sending a copy of the first time period.
The method according to claim 8 or 9, wherein the status report is specifically used to indicate that the first device receives the at least one copy of the PDCP layer;

Determining, by the second device, the replica retransmission scheme according to the status report, including:

Determining, by the PDCP layer, that the second device does not send or cancel the retransmission of the copy that the first device has received at the PDCP layer, according to the status report;

Transmitting, by the second device, the second indication information to the multiple logical channels of the second device in the PDCP layer, where the second indication information is used to indicate that the multiple logical channels are no longer sent or canceled again. Sending a copy that the first device has received at the PDCP layer.
The method according to any one of claims 8 to 10, wherein at least two of the plurality of first copies have different RLC numbers.
The method according to any one of claims 8 to 10, wherein each of the plurality of first copies has the same RLC number.
The method according to claim 12, wherein the status report is specifically configured to indicate that the first device ends at the first time period of the RLC layer and the second device is in the RLC layer The receipt of a copy of a period of time;

Determining, by the second device, the replica retransmission scheme according to the status report, including:

The second device determines, at the RLC layer, according to the status report, that the already received copy in the first time period is no longer sent or cancelled.
The method according to claim 12, wherein the status report is specifically configured to indicate a reception status of the at least one copy of the first device in an RLC layer;

Determining, by the second device, the replica retransmission scheme according to the status report, including:

The second device reports, at the RLC layer, according to the status report, that the copy that the first device has received at the RLC layer is no longer sent or cancelled.
The method according to any one of claims 12 to 14, wherein the method further comprises:

The status report received by the second device on any one of the plurality of logical channels is applicable to all of the plurality of logical channels.
The method according to any one of claims 8 to 15, wherein each of the plurality of first copies comprises a PDCP number and an RLC number.
An apparatus for transmitting data, comprising:

a receiving unit, configured to receive, on a plurality of logical channels of the radio link control RLC layer, a plurality of first copies of the same data packet sent by the second device;

a transmitting unit, configured to transmit at least part of the first copy of the plurality of first copies to a packet data convergence protocol PDCP layer of the device on at least part of the logical channels of the plurality of logical channels;

a sending unit, configured to send a status report to the second device, where the status report is used to indicate at least one of a first time period end of the device and a receiving condition of at least one copy of the device, where A time period is a receiving time at which the receiving unit receives the at least one copy, the at least one copy including the first copy.
The apparatus of claim 17, wherein each of the at least a portion of the first copies comprises a PDCP number and an RLC number;

The device also includes:

a first determining unit, configured to determine, at the PDCP layer, an RLC number of the to-be-received copy on the at least part of the logical channel according to the PDCP number and the RLC number included in each of the first copies;

The transmitting unit is further configured to: at the PDCP layer, transmit the RLC number of the to-be-received copy to the at least part of the logical channel of the RLC layer;

The receiving unit is further configured to continue to receive the replica according to the RLC number of the to-be-received replica on at least part of the logical channel of the RLC layer.
The device according to claim 17 or 18, wherein the status report is specifically used to indicate that the device ends at the first time period of the PDCP layer, and the copy in the first time period is not The second device is sent again or is cancelled again, or

The status report is specifically used to indicate that the device receives the at least one copy of the PDCP layer, and the copy that the receiving unit has received at the PDCP layer is not resent by the second device or is cancelled.
The apparatus according to any one of claims 17 to 19, wherein at least two of the first copies have at least two first copies having different RLC numbers.
The apparatus according to any one of claims 17 to 19, wherein each of the at least a portion of the first copies has the same RLC number.
The apparatus according to claim 21, wherein the status report is specifically configured to indicate the end of the first time period of the RLC layer and the reception of at least one copy in the first time period, The copy that has been received by the receiving unit in the first time period is not resent or cancelled by the second device, or

The status report is used to indicate the reception status of the device at least one copy of the RLC layer, and the copy that the receiving unit has received at the RLC layer is not resent by the second device or is cancelled to be resent.
The device according to claim 21 or 22, wherein the device further comprises:

a second determining unit, configured to: if the receiving unit receives the first device to send the first copy on any one of the multiple logical channels, determine, in each of the multiple logical channels The first copy of the logical channel has been received.
An apparatus for transmitting data, comprising:

a transmitting unit, configured to deliver, by the packet aggregation protocol PDCP layer, a plurality of first copies of the same data packet to a plurality of logical channels of the radio link control layer of the device;

a sending unit, configured to send, to each of the plurality of logical channels, a first copy corresponding to each logical channel to the first device;

a receiving unit, configured to receive a status report sent by the first device, where the status report is used to indicate at least one of a first time period of the first device and a receiving condition of at least one copy of the first device And the first time period is a receiving time that the first device receives the at least one copy, and the at least one copy includes the first copy;

a determining unit, configured to determine a copy retransmission scheme according to the status report.
The device according to claim 24, wherein the status report is specifically configured to indicate that the first device ends at the first time period of the PDCP layer;

The determining unit is specifically configured to:

Determining, according to the status report, that the copy in the first time period is no longer sent or canceled at the PDCP layer;

The transmitting unit is further configured to: transmit, by the PDCP layer, the first indication information to the multiple logical channels of the second device, where the first indication information is used to indicate that the multiple indications are not sent on the multiple logical channels. Or cancel sending the copy in the first time period again.
The device according to claim 24 or 25, wherein the status report is specifically used to indicate that the first device receives at least one copy of the PDCP layer;

The determining unit is specifically configured to:

Determining, according to the status report, that the PDCP layer no longer sends or cancels resending the copy that the first device has received at the PDCP layer;

The transmitting unit is further configured to: transmit, by the PDCP layer, the second indication information to the multiple logical channels of the second device, where the second indication information is used to indicate that the multiple signaling channels are no longer sent. Or cancel sending the copy that the first device has received at the PDCP layer.
The apparatus according to any one of claims 24 to 26, wherein at least two of the plurality of first copies have different RLC numbers of the first copies.
The apparatus according to any one of claims 24 to 26, wherein each of the plurality of first copies has the same RLC number.
The apparatus according to claim 28, wherein the status report is specifically configured to indicate that the first device ends at the first time period of the RLC layer and the second device is in the RLC layer The receipt of a copy of a period of time;

The determining unit is specifically configured to:

At the RLC layer, it is determined according to the status report that the already received copy within the first time period is no longer sent or cancelled.
The apparatus according to claim 28, wherein the status report is specifically configured to indicate a reception status of the at least one copy of the first device in an RLC layer;

The determining unit is specifically configured to:

At the RLC layer, according to the status report, the copy that the first device has received at the RLC layer is no longer sent or cancelled.
The apparatus according to any one of claims 28 to 30, wherein the status report received by the receiving unit on any one of the plurality of logical channels is applicable to all of the plurality of Logical channels.
The apparatus according to any one of claims 24 to 31, wherein each of the plurality of first copies comprises a PDCP number and an RLC number.