Communication method and communication system

Abstract

The present disclosure provides a communication method and a communication system, which relate to the field of communication. The method comprises: a first DU receives first uplink data transmitted by a terminal via a first transmission channel and a first carrier in a first time period; a second DU receives second uplink data transmitted by a terminal via a second transmission channel and a second carrier in the first time period; when the channel quality of the first carrier is less than a preset quality, the first DU sends a first control message to the terminal and sends an indication message to the second DU; in response to the indication message, the second DU sends a second control message to the terminal, so that the terminal stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message, and transmits the second uplink data to the second DU via the second transmission channel and the second carrier in the second time period and transmits the third uplink data to the second DU via the third transmission channel and the second carrier.

Description

Technical Field

[0001] The present disclosure relates to the field of communications, and in particular to a communication method and a communication system. Background Art

[0002] In the related art, a terminal may transmit uplink data via different transmission channels and different carriers based on a preset configuration. Summary of the invention

[0003] The inventors have noticed that when the channel quality of a certain carrier decreases, the terminal still transmits uplink data according to the preset transmission mode, which leads to a decrease in the transmission efficiency of the uplink data.

[0004] In order to solve the above problems, the embodiments of the present disclosure propose the following solutions.

[0005] According to one aspect of an embodiment of the present disclosure, a communication method is provided, including: a first distributed unit DU receives first uplink data transmitted by a terminal via a first transmission channel and a first carrier in a first time period; a second DU receives second uplink data transmitted by the terminal via a second transmission channel and a second carrier in the first time period; when the channel quality of the first carrier is less than a preset quality, the first DU sends a first control message to the terminal, and sends an indication message to the second DU; in response to the indication message, the second DU sends a second control message to the terminal, so that the terminal stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message, and transmits the second uplink data to the second DU via the second transmission channel and the second carrier in the second time period and transmits the third uplink data to the second DU via a third transmission channel and the second carrier.

[0006] In some embodiments, the method further includes: the first DU receives fourth uplink data transmitted by the terminal via a fourth transmission channel and the first carrier in a third time period after the second time period, wherein the third uplink data is stopped from being transmitted in the third time period.

[0007] In some embodiments, the first uplink data includes multiple first data packets, each first data packet carries a corresponding first sequence number, the second uplink data includes multiple second data packets, each second data packet carries a corresponding second sequence number, and the method further includes: the first DU forwards the first uplink data to a central unit CU; the second DU forwards the second uplink data to the CU; the CU sorts the multiple first data packets and the multiple second data packets according to the first sequence number and the second sequence number.

[0008] In some embodiments, the second uplink data includes multiple second data packets, each second data packet carries a corresponding second sequence number, and the third data includes multiple third data packets, each third data packet carries a corresponding third sequence number. The method also includes: the second DU forwards the second uplink data and the third uplink data to the CU; the CU sorts the multiple second data packets and the multiple third data packets according to the second sequence number and the third sequence number.

[0009] In some embodiments, the first DU sending the indication message to the second DU includes: the first DU sending the indication message to the CU; and the CU forwarding the indication message to the second DU.

[0010] In some embodiments, the first DU forwards the first uplink data to the CU via a first communication link, and forwards the indication message to the CU via a second communication link different from the first communication link.

[0011] In some embodiments, the channel quality of the first carrier is monitored by a first DU.

[0012] In some embodiments, the second carrier is based on a time division duplex (TDD) system.

[0013] In some embodiments, the second time period includes at least a first uplink timeslot of the second carrier after the first time period.

[0014] In some embodiments, the first carrier is based on a frequency division duplex (FDD) system.

[0015] In some embodiments, the frequency band of the first carrier is 2.1 GHz, and the frequency band of the second carrier is 3.5 GHz.

[0016] According to another aspect of an embodiment of the present disclosure, a communication system is provided, including: a first distributed unit DU, configured to: receive first uplink data transmitted by a terminal via a first transmission channel and a first carrier in a first time period; send a first control message to the terminal and send an indication message to a second DU when the channel quality of the first carrier is less than a preset quality; and a second DU, the second DU being configured to: receive second uplink data transmitted by the terminal via a second transmission channel and a second carrier in a first time period; send a second control message to the terminal in response to the indication message, so that the terminal stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message, and causes the terminal to transmit the second uplink data to the second DU via the second transmission channel and the second carrier in the second time period and transmit the third uplink data to the second DU via a third transmission channel and the second carrier.

[0017] In some embodiments, the first uplink data includes multiple first data packets, each first data packet carries a corresponding first sequence number, the second uplink data includes multiple second data packets, each second data packet carries a corresponding second sequence number, and the communication system further includes: a central unit CU, configured to: receive the first uplink data forwarded by the first DU; receive the second uplink data forwarded by the second DU; and sort the multiple first data packets and the multiple second data packets according to the first sequence number and the second sequence number.

[0018] In some embodiments, the communication system also includes: a terminal, configured to: transmit first uplink data via a first transmission channel and a first carrier in a first time period, and transmit second uplink data via a second transmission channel and a second carrier; in response to the first control message and the second control message, stop transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period, transmit the second uplink data to the second DU via the second transmission channel and the second carrier, and transmit the third uplink data to the second DU via a third transmission channel and the second carrier.

[0019] According to another aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, comprising computer-executable instructions, wherein when the computer-executable instructions are executed by one or more processors, the one or more processors execute the method described in any one of the above embodiments.

[0020] In an embodiment of the present disclosure, the first DU sends a first control message to the terminal when the channel quality of the first carrier is less than a preset quality, and sends an indication message to the second DU. The second DU sends a second control message to the terminal in response to the indication message, so that the terminal can switch from the mode of transmitting the first uplink data and the second uplink data to the mode of transmitting the second uplink data and the third uplink data in a timely manner when the channel quality of the first carrier decreases, thereby improving the transmission efficiency of the uplink data transmitted from the terminal. In addition, the embodiment of the present disclosure can also improve the utilization rate of the resources used by the terminal to transmit uplink data. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a flow chart of a communication method according to some embodiments of the present disclosure;

[0023] Figure 2 is a flow chart of a communication method according to some other embodiments of the present disclosure;

[0024] Figure 3 is a flow chart of a communication method according to some other embodiments of the present disclosure;

[0025] Figure 4 is an example of a first carrier and a second carrier according to some embodiments of the present disclosure;

[0026] Figure 5 is a structural diagram of a communication system according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0028] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0029] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0030] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0031] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0032] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] Figure 1 is a flow chart of a communication method according to some embodiments of the present disclosure.

[0034] like Figure 1 As shown, the communication method includes steps 102 to 108.

[0035] In step 102, a first distributed unit (DU) receives first uplink data of a terminal via a first transmission channel and a first carrier in a first time period.

[0036] In step 104, the second DU receives second uplink data transmitted by the terminal via the second transmission channel and the second carrier in the first time period.

[0037] For example, the first DU and the second DU are connected to a central unit (CU) and establish a data connection with a terminal. The terminal may be a mobile terminal with multiple transmission channels, such as a mobile phone.

[0038] In the first time period, first uplink data transmitted by the terminal via the first transmission channel and the first carrier is received by the first DU, and second uplink data transmitted via the second transmission channel and the second carrier is received by the second DU.

[0039] In some embodiments, the first DU forwards the received first uplink data to the CU, and the second DU also forwards the received second uplink data to the CU.

[0040] The first carrier may be based on a frequency division duplex (FDD) or time division duplex (TDD) system. The second carrier may also be based on a FDD or TDD system.

[0041] For example, the first carrier and the second carrier are both based on an FDD system. For another example, the first carrier and the second carrier are both based on a TDD system.

[0042] For another example, the first carrier is based on the FDD system, and the second carrier is based on the TDD system. In this way, the terminal can not only transmit the first uplink data via the first carrier uninterruptedly, but also transmit the second uplink data via the second carrier in the uplink time slot of the second carrier, so as to improve the transmission efficiency of the terminal transmitting the uplink data.

[0043] In some embodiments, the frequency bands of the first carrier and the second carrier are different. For example, the frequency band of the first carrier is 2.1 GHz, and the frequency band of the second carrier is 3.5 GHz. For another example, the frequency band of the first carrier is 3.5 GHz, and the frequency band of the second carrier is 2.1 GHz.

[0044] The following text will combine Figure 4 Some examples of first carriers and second carriers are given.

[0045] In step 106, when the channel quality of the first carrier is less than a preset quality, the first DU sends a first control message to the terminal, and sends an indication message to the second DU.

[0046] In some embodiments, the channel quality of the first carrier may be monitored by the first DU.

[0047] For example, the first DU may monitor the channel quality of the first carrier based on a signal to interference plus noise ratio (SINR) and a reference signal received power (RSRP).

[0048] In some embodiments, the first DU sends an indication message to the CU, and the CU forwards the indication message to the second DU.

[0049] In some embodiments, the communication link between the DU and the CU for transmitting the indication message is different from the communication link between the DU and the CU for transmitting uplink data.

[0050] For example, the first DU forwards the first uplink data to the CU via the first communication link, and sends the indication message to the CU via the second communication link different from the first communication link. In this way, interference between the indication message and the first uplink data can be avoided.

[0051] In step 108, in response to the indication message, the second DU sends a second control message to the terminal.

[0052] Here, the terminal stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message. In addition, in the second time period, the terminal transmits the second uplink data to the second DU via the second transmission channel and the second carrier, and transmits the third uplink data to the second DU via the third transmission channel and the second carrier.

[0053] It should be understood that the second period is after the terminal receives both the first control message and the second control message.

[0054] For example, the first control message causes the terminal to stop transmitting the first uplink data to the first DU via the first transmission channel and the first carrier in the second time period. The second control message causes the terminal to transmit the third uplink data to the second DU via the third transmission channel and the second carrier in the second time period in addition to transmitting the second uplink data to the second DU via the original second transmission channel and the second carrier. Both the first control message and the second control message cause the terminal to complete the switching of the transmission mode of the uplink data.

[0055] In some embodiments, the third transmission channel is the first transmission channel. In other embodiments, the third transmission channel is a transmission channel other than the first transmission channel and the second transmission channel.

[0056] In the above embodiment, the first DU sends a first control message to the terminal when the channel quality of the first carrier is less than the preset quality, and sends an indication message to the second DU. The second DU sends a second control message to the terminal in response to the indication message, so that the terminal can switch from the mode of transmitting the first uplink data and the second uplink data to the mode of transmitting the second uplink data and the third uplink data in a timely manner when the channel quality of the first carrier decreases, thereby improving the transmission efficiency of the uplink data transmitted from the terminal. In addition, the above embodiment can also improve the utilization rate of the resources used by the terminal to transmit uplink data.

[0057] Figure 2 is a flow chart of a communication method according to some other embodiments of the present disclosure.

[0058] like Figure 2 As shown, the communication method is Figure 1 In addition to steps 102 to 108, the method further includes step 202 executed after step 108.

[0059] In step 202, the first DU receives fourth uplink data transmitted by the terminal via the fourth transmission channel and the first carrier in a third time period after the second time period. Here, the third uplink data is stopped from being transmitted by the terminal in the third time period.

[0060] In some embodiments, in the third time period, the terminal transmits fourth uplink data to the first DU via the fourth transmission channel and the first carrier, and transmits second uplink data to the second DU via the second transmission channel and the second carrier.

[0061] In some embodiments, the fourth transmission channel is the first transmission channel in step 102. In this case, the terminal transmits the first uplink data to the first DU via the first transmission channel and the first carrier in the third time period.

[0062] In the above embodiment, by executing step 202, after the second time period ends, the terminal can switch from the mode of transmitting the second uplink data and the third uplink data via the second carrier to the mode of transmitting the fourth uplink data via the first carrier and the second uplink data via the second carrier. Compared with transmitting uplink data only via the second carrier, transmitting uplink data via the first carrier and the second carrier can better balance the transmission speed and coverage of uplink data.

[0063] The inventors have noticed that in the related art, because different DUs reallocate sequence numbers for multiple data packets in the received uplink data, these data packets cannot be correctly sorted, thereby affecting the delivery of the uplink data to the core network. Accordingly, the embodiments of the present disclosure also propose the following solution.

[0064] Figure 3is a flow chart of a communication method according to some further embodiments of the present disclosure.

[0065] like Figure 3 As shown, the communication method further includes steps 302 to 306 in addition to the above steps 102 to 108 .

[0066] In step 302, the first DU forwards first uplink data to the CU. Here, the first uplink data includes a plurality of first data packets, each of which carries a corresponding first sequence number.

[0067] In step 304, the second DU forwards the second uplink data to the CU. Here, the second uplink data includes a plurality of second data packets, each of which carries a corresponding second sequence number.

[0068] In step 306, the CU sorts the plurality of first data packets and the plurality of second data packets according to the first sequence number and the second sequence number.

[0069] For example, the first uplink data includes three first data packets, and their corresponding first sequence numbers are "1", "3" and "5", respectively. The second uplink data includes three second data packets, and their corresponding second sequence numbers are "2", "4" and "6", respectively. The CU can sort the three first data packets and the three second data packets according to the first sequence numbers and the second sequence numbers.

[0070] In some embodiments, the second DU forwards the second uplink data and the third uplink data to the CU. The second uplink data includes a plurality of second data packets, each of which carries a corresponding second sequence number. The third data includes a plurality of third data packets, each of which carries a corresponding third sequence number. The CU can sort the plurality of second data packets and the plurality of third data packets based on the second sequence number and the third sequence number.

[0071] In some embodiments, for example, the first DU and the second DU may include a medium access control (MAC) layer protocol stack, and the CU may include a packet data convergence protocol (PDCP) layer and a radio link control (RLC) layer protocol stack.

[0072] In the above embodiment, the first DU and the second DU forward multiple first data packets and multiple second data packets carrying corresponding first sequence numbers and second sequence numbers to the CU respectively. The CU sorts the multiple first data packets and multiple second data packets based on the first sequence number and the second sequence number. In this way, since the sequence numbers of the data packets have not changed, the CU can sort the data packets correctly, thereby not affecting the delivery of uplink data to the core network.

[0073] Figure 4 are examples of first and second carriers according to some embodiments of the present disclosure.

[0074] like Figure 4 As shown, the first carrier is based on the FDD system, and the second carrier is based on the TDD system. Here, the second carrier is a 2.5ms double-periodic frame structure.

[0075] In some embodiments, the time slot configuration of the second carrier based on the TDD system may be as follows: Figure 4 As shown in the figure, "D" represents a downlink time slot, "U" represents an uplink time slot, "S" represents a special time slot, and "GP" represents a protection time slot. In some embodiments, the ratio of D:GP:U in the special time slot is 10:2:2.

[0076] This example will be given later in conjunction with the first carrier and the second carrier. Figure 1 Some specific implementations of the communication method in .

[0077] In a first time period, the terminal transmits first uplink data to a first DU via a first transmission channel and a first carrier, and transmits second uplink data to a second DU via a second transmission channel and a second carrier.

[0078] For example, since the first carrier is based on the FDD system and the second carrier is based on the TDD system, in the first time period, the terminal can continuously transmit the first uplink data to the first DU and only transmit the second uplink data to the second DU in the uplink time slot of the second carrier.

[0079] Assuming that the channel quality of the first carrier is monitored to be less than the preset quality at time A, the first DU sends a first control message to the terminal and sends an indication message to the second DU. In response to the received indication message, the second DU sends a second control message to the terminal.

[0080] In response to receiving the first control message and the second control message, the terminal stops transmitting the first uplink data to the first DU via the first transmission channel and the first carrier, transmits the second uplink data to the second DU via the second transmission channel and the second carrier, and transmits the third uplink data to the second DU via the third transmission channel and the second carrier.

[0081] In some embodiments, Figure 4 As shown, the second time period at least includes the first uplink time slot of the second carrier after the first time period. For example, the second time period may include two consecutive uplink time slots.

[0082] In some embodiments, the third time period includes at least the first downlink time slot of the second carrier after the second time period. For example, the third time period may include three consecutive downlink time slots.

[0083] Figure 5 is a structural diagram of a communication system according to some embodiments of the present disclosure.

[0084] like Figure 5 As shown, the communication system includes a first DU 501 and a second DU 502 .

[0085] The first DU 501 can be configured to: receive first uplink data transmitted by the terminal 504 via the first transmission channel and the first carrier in the first time period; when the channel quality of the first carrier is less than the preset quality, send a first control message to the terminal 504 and send an indication message to the second DU 502.

[0086] The second DU 502 may be configured to: receive second uplink data transmitted by the terminal 504 via the second transmission channel and the second carrier in a first time period; and send a second control message to the terminal 504 in response to the indication message, so that the terminal 504 stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message, and causes the terminal 504 to transmit the second uplink data to the second DU 502 via the second transmission channel and the second carrier in the second time period and transmit the third uplink data to the second DU 502 via the third transmission channel and the second carrier.

[0087] It should be understood that, in addition to being configured to perform the above operations, the first DU 501 may also be configured to perform the above operations of the second DU 502. Similarly, in addition to being configured to perform the above operations, the second DU 502 may also be configured to perform the above operations of the first DU 501.

[0088] In some embodiments, the communication system also includes a CU 503 .

[0089] In some embodiments, the first uplink data includes multiple first data packets, each of which carries a corresponding first sequence number, and the second uplink data includes multiple second data packets, each of which carries a corresponding second sequence number. CU 503 can be configured to: receive the first uplink data forwarded by the first DU 501; receive the second uplink data forwarded by the second DU 502; and sort the multiple first data packets and the multiple second data packets according to the first sequence number and the second sequence number.

[0090] In some embodiments, the communication system further includes a terminal 504 .

[0091] The terminal 504 can be configured to: transmit first uplink data via the first transmission channel and the first carrier in a first time period, and transmit second uplink data via the second transmission channel and the second carrier; in response to the first control message and the second control message, stop transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period, transmit the second uplink data to the second DU 502 via the second transmission channel and the second carrier, and transmit the third uplink data to the second DU 502 via the third transmission channel and the second carrier.

[0092] The embodiments of the present disclosure further provide a computer-readable storage medium on which computer program instructions are stored. When the instructions are executed by a processor, the method of any one of the above embodiments is implemented.

[0093] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0094] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the communication system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0095] In addition, in the description of the present disclosure, the terms “first”, “second”, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance and order.

[0096] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer-readable storage media. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0097] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods and systems according to the embodiments of the present disclosure. It should be understood that the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate the functions for implementing the functions in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0098] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0100] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A communication method, include: The first distributed unit DU receives first uplink data transmitted by the terminal via the first transmission channel and the first carrier in the first time period and forwards the first uplink data to the central unit CU, wherein the first uplink data includes multiple first data packets, each of which carries a corresponding first sequence number; The second DU receives second uplink data transmitted by the terminal via the second transmission channel and the second carrier in the first time period and forwards the second uplink data to the CU, where the second uplink data includes multiple second data packets, each second data packet carries a corresponding second sequence number, and the CU sorts the multiple first data packets and the multiple second data packets according to the first sequence number and the second sequence number; When the channel quality of the first carrier is less than the preset quality, the first DU sends a first control message to the terminal and sends an indication message to the second DU; In response to the indication message, the second DU sends a second control message to the terminal, so that the terminal stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message, and causes the terminal to transmit the second uplink data to the second DU via the second transmission channel and the second carrier in the second time period and transmit the third uplink data to the second DU via the third transmission channel and the second carrier; and The first DU receives fourth uplink data transmitted by the terminal via the fourth transmission channel and the first carrier in a third time period after the second time period, wherein the third uplink data is stopped from being transmitted in the third time period.

2. The method according to claim 1, in, The second uplink data includes a plurality of second data packets, each of which carries a corresponding second sequence number, and the third uplink data includes a plurality of third data packets, each of which carries a corresponding third sequence number; The method further comprises: The second DU forwards the second uplink data and the third uplink data to the CU; The CU sorts the multiple second data packets and the multiple third data packets according to the second sequence number and the third sequence number.

3. The method according to claim 1, in, The first DU sending an indication message to the second DU includes: The first DU sends the indication message to the CU; The CU forwards the indication message to the second DU.

4. The method according to claim 3, in, The first DU forwards the first uplink data to the CU via a first communication link, and forwards the indication message to the CU via a second communication link different from the first communication link.

5. The method according to any one of claims 1 to 4, in, The channel quality of the first carrier is monitored by the first DU.

6. The method according to claim 1, in, The second carrier is based on a time division duplex TDD system.

7. The method according to claim 6, in, The second time period at least includes a first uplink timeslot of the second carrier after the first time period.

8. The method according to claim 6, in, The first carrier is based on a frequency division duplex FDD system.

9. The method according to claim 8, in, The frequency band of the first carrier is 2.1 GHz, and the frequency band of the second carrier is 3.5 GHz.

10. A communication system, include: The first distributed unit DU is configured to: receive first uplink data transmitted by the terminal via the first transmission channel and the first carrier in the first time period and forward the first uplink data to the central unit CU, wherein the first uplink data includes a plurality of first data packets, each of which carries a corresponding first sequence number; send a first control message to the terminal and send an indication message to the second DU when the channel quality of the first carrier is less than a preset quality; receive fourth uplink data transmitted by the terminal via the fourth transmission channel and the first carrier in a third time period after the second time period; The second DU is configured to: receive second uplink data transmitted by the terminal via the second transmission channel and the second carrier in a first time period and forward the second uplink data to the CU, wherein the second uplink data includes a plurality of second data packets, each second data packet carries a corresponding second sequence number; in response to the indication message, send a second control message to the terminal, so that the terminal stops transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period in response to the first control message and the second control message, and causes the terminal to transmit the second uplink data to the second DU via the second transmission channel and the second carrier in the second time period and transmit the third uplink data to the second DU via the third transmission channel and the second carrier, wherein the transmission of the third uplink data is stopped in the third time period; and The central unit CU is configured to: receive the first uplink data forwarded by the first DU; receive the second uplink data forwarded by the second DU; and sort the multiple first data packets and the multiple second data packets according to the first sequence number and the second sequence number.

11. The communication system according to claim 10, further comprising: include: The terminal is configured to: transmit first uplink data via the first transmission channel and the first carrier in a first time period, and transmit second uplink data via the second transmission channel and the second carrier; in response to the first control message and the second control message, stop transmitting the first uplink data via the first transmission channel and the first carrier in a second time period after the first time period, transmit the second uplink data to the second DU via the second transmission channel and the second carrier, and transmit the third uplink data to the second DU via the third transmission channel and the second carrier.

12. A computer-readable storage medium comprising computer-executable instructions, which, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 1-9.

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