CN114640426B - Data transmitting and receiving method, medium access control layer and storage medium - Google Patents

Abstract

The invention discloses a data transmitting and receiving method, an MAC layer and a storage medium, comprising the following steps: determining the bearing and/or the process of the MAC PDU sent to the lower layer; and transmitting according to the bearer and/or the process in sequence. Receiving a MAC PDU; determining the bearing and/or the process of the MAC PDU; and ordering the received MAC PDUs according to the bearer and/or the process in sequence. By adopting the invention, the SN length can be shortened, the overhead of transmitting long SN can be reduced, and the time and the overhead of storing and caching in the sequencing window and sequencing can be reduced. The MAC can be triggered to introduce more mechanisms for rapid data transmission, so that the time delay is reduced. On the premise of ensuring flexible use of HARQ processes, the ordering of the data packets is realized.

Description

A data sending and receiving method, a media access control layer, and a storage medium

Technical Field

The present invention relates to the field of wireless communication technology, and in particular to a data sending and receiving method, a media access control layer, and a storage medium.

Background technique

In 5G, MAC (Media Access Control) does not have a sorting method. The MAC at the sending end, according to the scheduling results, organizes the data on different RBs (Radio Bearers) or LGCHs (Logical Channels) of the user into MAC PDUs (Protocol Data Units), selects an available HARQ (Hybrid automatic repeat request) process and sends it to the receiving end. After receiving the MAC PDU on the corresponding HARQ process, the MAC at the receiving end sends the parsed MAC SDU to the upper layer, which sorts it.

The disadvantage of the existing technology is that after some new technologies are introduced, the MAC unordered method will cause the system overhead to increase.

Summary of the invention

The present invention provides a data sending and receiving method, a MAC layer and a storage medium, which are used to solve the problem of increasing system overhead due to MAC non-sequencing.

The present invention provides the following technical solutions:

A data sending method, comprising:

Determine the bearer and/or process of the MAC PDU sent to the lower layer;

The sending is performed in sequence according to the bearer and/or process.

In implementation, sending in order according to the bearer and/or process includes:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, the MAC PDUs are assembled and sent in the order received from the upper layer;

When sending between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sent at the MAC layer in the order in which they are received from the upper-layer bearer, taking the upper-layer bearer as a unit.

During implementation, when sending between different processes, it further includes:

When each MAC PDU is sent, the identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, when each MAC PDU is sent, identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU is carried in the MAC PDU;

If the identification information is one of the following information or a combination thereof, the identification information is carried by sending data according to the air interface timing relationship: the subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of the PDCCH, and air interface time-frequency domain resource information of the PDSCH;

If the identification information is a HARQ process ID, it carries the preceding and/or succeeding HARQ process IDs.

In implementation, if the identification information is a HARQ process ID, when constructing the control information of the MAC PDU to be sent this time, the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent this time is carried;

When the data is retransmitted, it carries the HARQ process ID of the subsequent MAC PDU, or does not carry the HARQ process ID of the subsequent MAC PDU.

In implementation, the HARQ process ID is sent in the DCI via the PDCCH, or is carried in the MAC CE.

A data receiving method, comprising:

Receive MAC PDU;

Determine the bearer and/or process of the MAC PDU;

The received MAC PDUs are sorted in order according to the bearer and/or process.

In implementation, sorting the received MAC PDUs in order according to the bearer and/or process includes:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, sorting the MAC SDUs in the received MAC PDU in the order in which they are received;

When receiving between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sorted in the order of receiving, taking the upper-layer bearer as the unit.

During implementation, when receiving between different processes, it further includes:

When receiving each MAC PDU, it is sorted according to the identification information of the predecessor and/or subsequent MAC PDU carried by the MAC PDU.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the sorting is performed according to the identification information of the predecessor and/or successor MAC PDU carried by the MAC PDU, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU carried in the MAC PDU is used for sorting;

If the identification information is one of the following information or a combination thereof, the carried identification information is determined by the air interface timing relationship during reception: the air interface subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

If the identification information is a HARQ process ID, the order is performed according to the carried predecessor and/or successor HARQ process IDs.

In implementation, if the identification information is a HARQ process ID, the one carrying the HARQ process ID of the predecessor MAC PDU of the currently transmitted MAC PDU is the currently transmitted MAC PDU;

The data that carries the HARQ process ID of the subsequent MAC PDU or does not carry the HARQ process ID of the subsequent MAC PDU is retransmitted data.

In implementation, the HARQ process ID is received in the DCI via the PDCCH, or is carried in the MAC CE.

During implementation, it further includes:

The data packets are reassembled according to the sorting results until all the data packets are reassembled and delivered or the reassembly is stopped when they are not received correctly.

During implementation, it further includes:

Each HARQ process sets up a multi-layer cache mechanism to reassemble data packets based on the sorting results.

During implementation, it further includes:

The received PDUs are delivered to the upper layer in the order of the PDUs of each upper layer.

A MAC layer, comprising:

The processor reads the program in the memory and performs the following processes:

Determine the bearer and/or process of the MAC PDU sent to the lower layer;

Sending in order according to the bearer and/or process;

A transceiver is used to receive and send data under the control of the processor.

In implementation, sending in order according to the bearer and/or process includes:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, the MAC PDUs are assembled and sent in the order received from the upper layer;

When sending between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sent at the MAC layer in the order in which they are received from the upper-layer bearer, taking the upper-layer bearer as a unit.

During implementation, when sending between different processes, it further includes:

When each MAC PDU is sent, the identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, when each MAC PDU is sent, identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU is carried in the MAC PDU;

If the identification information is one of the following information or a combination thereof, the identification information is carried by sending data according to the air interface timing relationship: the subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of the PDCCH, and air interface time-frequency domain resource information of the PDSCH;

If the identification information is a HARQ process ID, it carries the preceding and/or succeeding HARQ process IDs.

In implementation, if the identification information is a HARQ process ID, when constructing the control information of the MAC PDU to be sent this time, the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent this time is carried;

When the data is retransmitted, it carries the HARQ process ID of the subsequent MAC PDU, or does not carry the HARQ process ID of the subsequent MAC PDU.

In implementation, the HARQ process ID is sent in the DCI via the PDCCH, or is carried in the MAC CE.

A MAC layer, comprising:

A sending determination module, used to determine the bearer and/or process of the MAC PDU sent to the lower layer;

The sending module is used to send in sequence according to the bearer and/or process.

In implementation, the sending module is further used to send in sequence according to the bearer and/or process, including:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, the MAC PDUs are assembled and sent in the order received from the upper layer;

When sending between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sent at the MAC layer in the order in which they are received from the upper-layer bearer, taking the upper-layer bearer as a unit.

In implementation, the sending module is further used to carry the identification information of the predecessor and/or subsequent MAC PDU of each MAC PDU when sending the MAC PDU.

In implementation, the sending module is further used to carry identification information of the predecessor and/or successor MAC PDU including one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the sending module is further used to carry the identification information of the MAC PDU predecessor and/or subsequent MAC PDU when sending each MAC PDU, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU is carried in the MAC PDU;

If the identification information is one of the following information or a combination thereof, the identification information is carried by sending data according to the air interface timing relationship: the subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of the PDCCH, and air interface time-frequency domain resource information of the PDSCH;

If the identification information is a HARQ process ID, it carries the preceding and/or succeeding HARQ process IDs.

In implementation, the sending module is further used to carry the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent when constructing the control information of the MAC PDU to be sent this time, if the identification information is the HARQ process ID during sending;

When the data is retransmitted, it carries the HARQ process ID of the subsequent MAC PDU, or does not carry the HARQ process ID of the subsequent MAC PDU.

In implementation, the sending module is further used to send the HARQ process ID in the DCI through the PDCCH, or to send the HARQ process ID by carrying it in the MAC CE.

A MAC layer, comprising:

The processor reads the program in the memory and performs the following processes:

Receive MAC PDU;

Determine the bearer and/or process of the MAC PDU;

sorting the received MAC PDUs in order according to the bearer and/or process;

A transceiver is used to receive and send data under the control of the processor.

In implementation, sorting the received MAC PDUs in order according to the bearer and/or process includes:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, sorting the MAC SDUs in the received MAC PDU in the order in which they are received;

When receiving between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sorted in the order of receiving, taking the upper-layer bearer as the unit.

During implementation, when receiving between different processes, it further includes:

When receiving each MAC PDU, it is sorted according to the identification information of the predecessor and/or subsequent MAC PDU carried by the MAC PDU.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the sorting is performed according to the identification information of the predecessor and/or successor MAC PDU carried by the MAC PDU, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU carried in the MAC PDU is used for sorting;

If the identification information is one of the following information or a combination thereof, the carried identification information is determined by the air interface timing relationship during reception: the air interface subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

If the identification information is a HARQ process ID, the order is performed according to the carried predecessor and/or successor HARQ process IDs.

In implementation, if the identification information is a HARQ process ID, the one carrying the HARQ process ID of the predecessor MAC PDU of the currently transmitted MAC PDU is the currently transmitted MAC PDU;

The data that carries the HARQ process ID of the subsequent MAC PDU or does not carry the HARQ process ID of the subsequent MAC PDU is retransmitted data.

In implementation, the HARQ process ID is received in the DCI via the PDCCH, or is carried in the MAC CE.

During implementation, it further includes:

The data packets are reassembled according to the sorting results until all the data packets are reassembled and delivered or the reassembly is stopped when they are not received correctly.

During implementation, it further includes:

Each HARQ process sets up a multi-layer cache mechanism to reassemble data packets based on the sorting results.

During implementation, it further includes:

The received PDUs are delivered to the upper layer in the order of the PDUs of each upper layer.

A MAC layer, comprising:

A receiving module, used for receiving a MAC PDU;

A receiving and determining module, configured to determine a bearer and/or process of a MAC PDU;

A sorting module is used to sort the received MAC PDUs in sequence according to the bearer and/or process.

In implementation, the sorting module is further used to sort the received MAC PDUs in sequence according to the bearer and/or process, including:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, sorting the MAC SDUs in the received MAC PDU in the order in which they were received;

When receiving between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sorted in the order of receiving, taking the upper-layer bearer as the unit.

In implementation, the sorting module is further used to sort each MAC PDU when receiving between different processes according to the identification information of the predecessor and/or subsequent MAC PDU carried by the MAC PDU.

In implementation, the sorting module is further used to sort the preceding and/or succeeding MAC PDUs according to identification information of the predecessor and/or successor MAC PDUs including one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the sorting module is further used to sort according to the identification information of the predecessor and/or successor MAC PDU carried by the MAC PDU, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU carried in the MAC PDU is used for sorting;

If the identification information is one of the following information or a combination thereof, the carried identification information is determined by the air interface timing relationship during reception: the air interface subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

If the identification information is a HARQ process ID, the order is performed according to the carried predecessor and/or successor HARQ process IDs.

In implementation, the sorting module is further used to, when sorting, if the identification information is a HARQ process ID, and the one carrying the HARQ process ID of the predecessor MAC PDU of the MAC PDU sent this time is the MAC PDU sent this time;

The data that carries the HARQ process ID of the subsequent MAC PDU or does not carry the HARQ process ID of the subsequent MAC PDU is retransmitted data.

In implementation, the receiving module is further used to receive the HARQ process ID in the DCI through the PDCCH, or to receive the HARQ process ID by carrying it in the MAC CE.

During implementation, it further includes:

The reassembly module is used to reassemble the data packets according to the sorting result until all the data packets are reassembled and delivered or stop reassembling when they are not received correctly.

In implementation, the reassembly module is further used to establish a multi-layer cache mechanism for each HARQ process, and to reassemble data packets according to the sorting results.

In implementation, the reassembly module is further used to deliver the received PDU to the upper layer in the order of each upper layer's PDU.

A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the above-mentioned data sending method and/or data receiving method.

The beneficial effects of the present invention are as follows:

In the technical solution provided by the embodiment of the present invention, since, when sending, the MAC PDU is sent in sequence according to the bearer and/or process; when receiving, the received MAC PDU is sorted in sequence according to the bearer and/or process, MAC sorting is implemented, thereby reducing the scope of upper layer disorder, and thus shortening the SN length, reducing the overhead of transmitting long SN, and reducing the sorting window and the time and storage cache overhead during sorting.

Furthermore, MAC sorting can trigger MAC to introduce more mechanisms for fast data transmission, thereby reducing latency.

Furthermore, the data packets are sorted under the premise of ensuring the flexible use of the HARQ process.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

1 is a schematic diagram of an implementation flow of a method for sending data on a transmitting end MAC according to an embodiment of the present invention;

2 is a schematic diagram of an implementation flow of a data receiving method on a receiving end MAC according to an embodiment of the present invention;

FIG3 is a schematic diagram of MAC HARQ multi-process sending and receiving MAC PDU in an embodiment of the present invention;

FIG4 is a schematic diagram of MAC HARQ process caching and sorting in an embodiment of the present invention;

FIG5 is a schematic diagram of the structure of a MAC layer according to an embodiment of the present invention;

FIG6 is a schematic diagram of the structure of MAC layer 2 in an embodiment of the present invention.

Detailed ways

The inventors noticed during the invention process that:

It is a common method of RAN (Radio Access Network) to sort data packets by the upper layer of the MAC layer (such as RLC (Radio Link Control) or PDCP (Packet Data Convergence Protocol)).

5G introduces DC (Dual Connectivity) and MC (Multiple Connectivity). The system overhead caused by the need to sort packets due to disordered data packets is increasing. For example, 5G PDCP introduces SN (Sequence Number) with a length of 18 bits. If the disorder can be reduced, the SN length can be shortened, the overhead of transmitting long SN can be reduced, and the sorting window, the time during sorting, and the overhead of storage cache can be reduced.

Based on this, an embodiment of the present invention provides a method for sorting MAC PDUs by the order of MAC processes selected during MAC scheduling when HARQ multi-processes are sent, thereby ensuring orderly reception of MAC layer data packets and reducing sorting overhead on the link.

The specific implementation of the present invention will be described below with reference to the accompanying drawings.

In the description process, the implementation of the transmitting end MAC and the receiving end MAC will be described respectively, and then an example of the coordinated implementation of the two will be given to better understand the implementation of the scheme given in the embodiment of the present invention. This description does not mean that the two must be implemented in coordination or must be implemented separately. In fact, when the transmitting end MAC and the receiving end MAC are implemented separately, they also solve the problems of the transmitting end MAC and the receiving end MAC respectively, and when the two are used in combination, better technical effects will be obtained.

FIG. 1 is a schematic diagram of an implementation flow of a data transmission method on a transmitting end MAC, as shown in the figure, including:

Step 101: Determine the bearer and/or process of the MAC PDU sent to the lower layer;

Step 102: Send in sequence according to the bearer and/or process.

FIG. 2 is a schematic diagram of a data receiving method implementation flow on a receiving end MAC, as shown in the figure, including:

Step 201: Receive MAC PDU;

Step 202: Determine the bearer and/or process of the MAC PDU;

Step 203: Sort the received MAC PDUs in order according to the bearer and/or process.

Specifically, the data packets that are out of order due to HARQ multi-process are sorted at the MAC layer, thereby reducing the data packet sorting pressure at the upper layer of the MAC layer.

The MAC scheduler can be relied upon to control the order in which data packets are sent during scheduling, thereby enabling the MAC layer at the receiving end to receive and sort out out-of-order data packets.

The implementation of the MAC PDU sorting scheme for HARQ multi-process is described below.

In implementation, at the transmitting end MAC, sending is performed in sequence according to the bearer and/or process, including:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, the MAC PDUs are assembled and sent in the order received from the upper layer;

When sending between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sent at the MAC layer in the order in which they are received from the upper-layer bearer, taking the upper-layer bearer as a unit.

Correspondingly, at the receiving end MAC, the received MAC PDUs are sorted in order according to the bearer and/or process, including:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, sorting the MAC SDUs in the received MAC PDU in the order in which they were received;

When receiving between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sorted in the order of receiving, taking the upper-layer bearer as the unit.

Specifically, the MAC PDU (Protocol Data Unit) contains the data content MAC SDU (Service Data Unit), and each MAC SDU contains the PDU of the upper layer of the MAC layer. Each MAC SDU can contain one or more data packets on the upper layer bearer (in 5G, one MAC SDU can only carry data of one upper layer bearer (logical channel or DRB (Data Radio Bearer)), and this limitation may be broken in future communication systems). Each MAC SDU can contain one or more upper layer PDUs transmitted by the same upper layer bearer (in 5G, the upper layer with MAC encapsulates multiple SDUs of the upper layer into one upper layer PDU, that is, it only contains one upper layer PDU).

That is, the MAC layer's HARQ multi-threaded sorting solution completes sorting at two levels:

Case 1: Ordering of upper layer data packets contained in MAC SDU: Order one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU. Send and receive the MAC layer in the order received from the upper layer.

Case 2: Sorting between MAC PDUs between different processes: When sending between different processes, the data packets of one or more upper-layer bearers contained in the MAC SDUs in the MAC PDUs sent by different processes are sorted by upper-layer bearers. The MAC layer sends and receives data in the order received from the upper-layer bearers.

FIG3 is a schematic diagram of MAC HARQ multi-process receiving and sending MAC PDU. As shown in the figure, FIG3 shows a schematic diagram of using HARQ multi-process receiving and sending MAC PDU.

Among them, TB (Transport Block) is a data block transmitted by each HARQ process, that is, MAC PDU.

The MAC scheduler selects an idle and available HARQ process to send data each time, so the MAC scheduler does not select processes in the order of HARQ process ID. In Figure 3, process 1# is not used because process n-1# receives ACK (acknowledgement) feedback in time after sending data and becomes an "available process". When the HARQ process is determined, the MAC PDU is constructed.

For case 1 (ordering of upper layer data packets contained in MAC SDU):

1. When the transmitting MAC constructs a MAC PDU, it constructs the MAC PDU in the order of the upper layer PDUs received from the upper layer of the MAC.

2. When parsing the MAC PDU, the receiving MAC delivers data to the upper layer according to the order of different data units in the MAC SDU.

For case 2 (ordering between MAC PDUs in different processes), the ordering implementation can be as follows:

In implementation, on the sending end MAC, when sending between different processes, it further includes:

When each MAC PDU is sent, the identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried.

Correspondingly, the MAC at the receiving end has, when receiving between different processes, further including:

When receiving each MAC PDU, it is sorted according to the identification information of the predecessor and/or subsequent MAC PDU carried by the MAC PDU.

1. When the transmitting MAC sends each MAC PDU to its lower layer, it carries the identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU.

2. After receiving a MAC PDU, the MAC at the receiving end completes the sorting of the predecessor or successor MAC PDU according to the identification information of the predecessor and/or successor MAC PDU of the MAC PDU.

The implementation of the transmitting end MAC in case 2 is described below.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

Specifically, the identification information of the predecessor and/or subsequent MAC PDU can be the HARQ process ID (Process ID) that sends the MAC PDU, or the sequence number of the data packet sent, or the air interface subframe number (Sub Frame), frame number (Frame), symbol index (Symbol), time slot number (Time Slot) one or a combination of several, or the air interface time-frequency domain resource information of PDCCH (Physical downlink control channel) or PDSCH (Physical downlink shared channel).

There is no predecessor for the first newly transmitted data packet and no successor for the last data packet.

In a specific implementation, when each MAC PDU is sent, the identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU is carried in the MAC PDU;

If the identification information is one of the following information or a combination thereof, the identification information is carried by sending data according to the air interface timing relationship: the subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of the PDCCH, and air interface time-frequency domain resource information of the PDSCH;

If the identification information is a HARQ process ID, it carries the preceding and/or succeeding HARQ process IDs.

In a specific implementation, if the identification information is a HARQ process ID, when constructing the control information of the MAC PDU to be sent this time, the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent this time is carried;

When the data is retransmitted, it carries the HARQ process ID of the subsequent MAC PDU, or does not carry the HARQ process ID of the subsequent MAC PDU.

Specifically, if it is the sequence number of a MAC PDU, it is only necessary to carry the sequence number of the current MAC PDU in the MAC PDU, and there is no need to carry the sequence number of the predecessor and/or successor MAC PDU, because the sequence number itself includes the preceding and following relationship.

If it is an identifier related to the air interface timing, that is, one or a combination of the air interface subframe number (Sub Frame), frame number (Frame), symbol index (Symbol), time slot number (Time Slot), or the air interface time-frequency domain resource information of PDCCH/PDSCH, then it is not necessary to carry the above information when sending the MAC PDU, and the data can be sent according to the air interface timing relationship. The receiver can determine the predecessor and/or successor MAC PDU corresponding to the MAC PDU received this time based on the relevant identifier of the air interface timing of the received PDCCH or PDSCH or the air interface time-frequency domain resource information, because the above air interface timing relationship itself contains the previous and next relationship.

If it is a HARQ process ID, it needs to carry the predecessor and/or successor process ID, because the MAC does not select the available HARQ process according to the order of the process ID when sending. When forming the control information of the MAC PDU to be sent this time, the MAC determines the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent this time. When it is retransmitted data, the successor HARQ process ID can be carried or not.

When the MAC scheduler schedules, if it is a new MAC PDU (new transmission), the HARQ ID (predecessor HARQ process ID) used in the previous scheduling is carried by the MAC PDU. If it is a retransmission of a MAC PDU (retransmission), the HARQ ID (predecessor HARQ process ID) used in the previous scheduling and/or the next next successor process ID is carried by the MAC PDU.

In a specific implementation, the HARQ process ID is sent in the DCI through the PDCCH, or is sent by being carried in the MAC CE.

HARQ process ID transmission method: The predecessor and/or successor HARQ process ID can be added in the DCI (Downlink Control Information) that carries the control information and sent through the PDCCH channel. A new MAC CE (Media Access Control Element; CE: Control Element) type can be added to carry the newly added predecessor and/or successor HARQ process ID.

The implementation of the receiving end MAC in case 2 is described below.

In implementation, the MAC PDUs are sorted according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDUs, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU carried in the MAC PDU is used for sorting;

If the identification information is one of the following information or a combination thereof, the implicitly carried identification information is determined by the air interface timing relationship during reception: the air interface subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

If the identification information is a HARQ process ID, the order is performed according to the carried predecessor and/or successor HARQ process IDs.

In a specific implementation, if the identification information is a HARQ process ID, the one carrying the HARQ process ID of the predecessor MAC PDU of the currently transmitted MAC PDU is the currently transmitted MAC PDU;

The data that carries the HARQ process ID of the subsequent MAC PDU or does not carry the HARQ process ID of the subsequent MAC PDU is retransmitted data.

In a specific implementation, the HARQ process ID is received in the DCI through the PDCCH, or is received by being carried in the MAC CE.

Specifically, the MAC PDUs are sorted according to the identification information of the predecessor and/or successor MAC PDUs. The MAC PDU received this time is sorted immediately after the predecessor information. If the identification information of the successor is also carried, it can be used to confirm whether the successor is correct, thereby further confirming the sorting position of the MAC PDU.

If it is the sequence number of the MAC PDU, insert it directly into the corresponding position according to the sequence number;

If it is an identifier related to air interface timing, the sorting position is determined according to the constraint relationship;

If it is a HARQ process ID, it points to the corresponding HARQ process;

Regardless of whether the transmitting end sends the identification information of the subsequent MAC PDU, when the receiving end stores the received MAC PDU, if the MAC PDU has a predecessor (the first newly transmitted data packet has no predecessor) or a successor (the last newly transmitted data packet has no successor; during the data exchange process, the identification information can be updated to the predecessor MAC PDU after the successor data packet arrives), the predecessor and successor relationship of the MAC PDU must be established.

During implementation, the following may further be included:

The data packets are reassembled according to the sorting results until all the data packets are reassembled and delivered or the reassembly is stopped when they are not received correctly.

Specifically, data packets are reassembled according to the sorting results. If the predecessor data packet has been correctly received (including being delivered to the upper layer of MAC), the current MAC PDU is parsed to obtain the corresponding MAC SDU and the upper layer PDU it contains, and delivered to the upper layer of MAC in sequence. The successor MAC PDU of the MAC PDU is read. If the MAC PDU has been correctly received, the current MAC PDU is parsed to obtain the corresponding MAC SDU and the upper layer PDU it contains, and delivered to the upper layer of MAC in sequence. Continue to read the subsequent MAC PDU until all data packets are reassembled and delivered or have not been correctly received, and stop the reassembly.

During implementation, the method may further include:

Each HARQ process sets up a multi-layer cache mechanism to reassemble data packets based on the sorting results.

Specifically, each HARQ process establishes a multi-layer cache mechanism to implement the function of sequentially reassembling data packets.

FIG4 is a schematic diagram of MAC HARQ process cache and sorting. As shown in the figure, FIG4 presents a schematic diagram of the cache function of each HARQ process. The horizontal bidirectional arrow line of type A represents the relationship between the predecessor and successor of the MAC PDU in the cache of the HARQ process. The vertical bidirectional arrow line of type B represents the relationship between different rounds of the cached MAC PDU of a HARQ process. The single arrow slash line of type C represents the index relationship between a HARQ process and its cache.

The sorting is performed in the direction indicated by the horizontal double-headed arrow line of type A. When the previous MAC PDU of a process is sorted and delivered, line C is directed to the next MAC PDU (Buffer) waiting for sorting according to the index of line B.

For retransmitted data packets, if they are not successfully retransmitted, they can be discarded at the MAC layer and retransmitted and sorted by the upper layer of MAC. If the receiving end cannot receive information due to information loss during air interface transmission, resulting in inconsistent information between the sending end and the receiving end, such as PDCCH loss causing the sending end to send a data packet, but the receiving end does not perceive it (that is, the receiving end does not know that the other end has sent it) until the sending end sends a data packet, this disorder can also be sorted by the upper layer of MAC.

During implementation, the method may further include:

The received PDUs are delivered to the upper layer in the order of the PDUs of each upper layer.

Specifically, MAC delivers the received PDUs to the upper layer in the order of each upper layer PDU.

Based on the same inventive concept, an embodiment of the present invention also provides a MAC layer and a computer-readable storage medium. Since the principles of solving the problems by these devices are similar to those of the data sending method and the data receiving method, the implementation of these devices can refer to the implementation of the method, and the repeated parts will not be repeated.

When implementing the technical solution provided by the embodiment of the present invention, it can be implemented as follows.

FIG5 is a schematic diagram of the structure of a MAC layer. As shown in the figure, the MAC layer includes:

The processor 500 is used to read the program in the memory 520 and execute the following process:

Determine the bearer and/or process of the MAC PDU sent to the lower layer;

Sending in order according to the bearer and/or process;

The transceiver 510 is configured to receive and send data under the control of the processor 500 .

In implementation, sending in order according to the bearer and/or process includes:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, the MAC PDUs are assembled and sent in the order received from the upper layer;

When sending between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sent at the MAC layer in the order in which they are received from the upper-layer bearer, taking the upper-layer bearer as a unit.

During implementation, when sending between different processes, it further includes:

When each MAC PDU is sent, the identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, when each MAC PDU is sent, identification information of the predecessor and/or subsequent MAC PDU of the MAC PDU is carried, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU is carried in the MAC PDU;

If the identification information is one of the following information or a combination thereof, the identification information is carried by sending data according to the air interface timing relationship: the subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of the PDCCH, and air interface time-frequency domain resource information of the PDSCH;

If the identification information is a HARQ process ID, it carries the preceding and/or succeeding HARQ process IDs.

In implementation, if the identification information is a HARQ process ID, when constructing the control information of the MAC PDU to be sent this time, the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent this time is carried;

When the data is retransmitted, it carries the HARQ process ID of the subsequent MAC PDU, or does not carry the HARQ process ID of the subsequent MAC PDU.

In implementation, the HARQ process ID is sent in the DCI via the PDCCH, or is carried in the MAC CE.

Wherein, in FIG5, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 500 and various circuits of memory represented by memory 520 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 510 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 when performing operations.

An embodiment of the present invention further provides a MAC layer, including:

A sending determination module, used to determine the bearer and/or process of the MAC PDU sent to the lower layer;

The sending module is used to send in sequence according to the bearer and/or process.

In implementation, the sending module is further used to send in sequence according to the bearer and/or process, including:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, the MAC PDUs are assembled and sent in the order received from the upper layer;

When sending between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sent at the MAC layer in the order in which they are received from the upper-layer bearer, taking the upper-layer bearer as a unit.

In implementation, the sending module is further used to carry the identification information of the predecessor and/or subsequent MAC PDU of each MAC PDU when sending the MAC PDU.

In implementation, the sending module is further used to carry identification information of the predecessor and/or successor MAC PDU including one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the sending module is further used to carry the identification information of the MAC PDU predecessor and/or subsequent MAC PDU when sending each MAC PDU, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU is carried in the MAC PDU;

If the identification information is one of the following information or a combination thereof, the identification information is carried by sending data according to the air interface timing relationship: the subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of the PDCCH, and air interface time-frequency domain resource information of the PDSCH;

If the identification information is a HARQ process ID, it carries the preceding and/or succeeding HARQ process IDs.

In implementation, the sending module is further used to carry the HARQ process ID of the predecessor MAC PDU of the MAC PDU to be sent when constructing the control information of the MAC PDU to be sent this time, if the identification information is the HARQ process ID during sending;

When the data is retransmitted, it carries the HARQ process ID of the subsequent MAC PDU, or does not carry the HARQ process ID of the subsequent MAC PDU.

In implementation, the sending module is further used to send the HARQ process ID in the DCI through the PDCCH, or to send the HARQ process ID by carrying it in the MAC CE.

For the convenience of description, the various parts of the above-mentioned device are divided into various modules or units according to their functions and described separately. Of course, when implementing the present invention, the functions of each module or unit can be implemented in the same or multiple software or hardware.

FIG6 is a schematic diagram of the structure of the MAC layer 2. As shown in the figure, the MAC layer includes:

The processor 600 is used to read the program in the memory 620 and execute the following process:

Receive MAC PDU;

Determine the bearer and/or process of the MAC PDU;

sorting the received MAC PDUs in order according to the bearer and/or process;

The transceiver 610 is configured to receive and send data under the control of the processor 600 .

In implementation, sorting the received MAC PDUs in order according to the bearer and/or process includes:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, sorting the MAC SDUs in the received MAC PDU in the order in which they were received;

When receiving between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sorted in the order of receiving, taking the upper-layer bearer as the unit.

During implementation, when receiving between different processes, it further includes:

When receiving each MAC PDU, it is sorted according to the identification information of the predecessor and/or subsequent MAC PDU carried by the MAC PDU.

In implementation, the identification information of the predecessor and/or successor MAC PDU includes one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the MAC PDUs are sorted according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDUs, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU carried in the MAC PDU is used for sorting;

If the identification information is one of the following information or a combination thereof, the carried identification information is determined by the air interface timing relationship during reception: the air interface subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

If the identification information is a HARQ process ID, the order is performed according to the carried predecessor and/or successor HARQ process IDs.

In implementation, if the identification information is a HARQ process ID, the one carrying the HARQ process ID of the predecessor MAC PDU of the currently transmitted MAC PDU is the currently transmitted MAC PDU;

The data that carries the HARQ process ID of the subsequent MAC PDU or does not carry the HARQ process ID of the subsequent MAC PDU is retransmitted data.

In implementation, the HARQ process ID is received in the DCI via the PDCCH, or is carried in the MAC CE.

During implementation, it further includes:

The data packets are reassembled according to the sorting results until all the data packets are reassembled and delivered or the reassembly is stopped when they are not received correctly.

During implementation, it further includes:

Each HARQ process sets up a multi-layer cache mechanism to reassemble data packets based on the sorting results.

During implementation, it further includes:

The received PDUs are delivered to the upper layer in the order of the PDUs of each upper layer.

In FIG. 6 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 600 and various circuits of memory represented by memory 620 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 610 may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 when performing operations.

An embodiment of the present invention further provides a MAC layer, including:

A receiving module, used for receiving a MAC PDU;

A receiving and determining module, configured to determine a bearer and/or process of a MAC PDU;

A sorting module is used to sort the received MAC PDUs in sequence according to the bearer and/or process.

In implementation, the sorting module is further used to sort the received MAC PDUs in sequence according to the bearer and/or process, including:

For one or more upper layer PDUs carried by the same upper layer bearer contained in each MAC SDU, sorting the MAC SDUs in the received MAC PDU in the order in which they are received;

When receiving between different processes, one or more upper-layer bearer data packets contained in the MAC SDU in the MAC PDU sent by different processes are sorted in the order of receiving, taking the upper-layer bearer as the unit.

In implementation, the sorting module is further used to sort each MAC PDU when receiving between different processes according to the identification information of the predecessor and/or subsequent MAC PDU carried by the MAC PDU.

In implementation, the sorting module is further used to sort the preceding and/or succeeding MAC PDUs according to identification information of the predecessor and/or successor MAC PDUs including one or a combination of the following information:

The HARQ process ID of the MAC PDU sent, the serial number of the data packet sent, one or a combination of the air interface subframe number, frame number, symbol index, time slot number, air interface time and frequency domain resource information of PDCCH, and air interface time and frequency domain resource information of PDSCH.

In implementation, the sorting module is further used to sort according to the identification information of the predecessor and/or successor MAC PDU carried by the MAC PDU, including:

If the identification information is the sequence number of the MAC PDU, the sequence number of the current MAC PDU carried in the MAC PDU is used for sorting;

If the identification information is one of the following information or a combination thereof, the carried identification information is determined by the air interface timing relationship during reception: the air interface subframe number, frame number, symbol index, time slot number, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

If the identification information is a HARQ process ID, the order is performed according to the carried predecessor and/or successor HARQ process IDs.

In implementation, the sorting module is further used to, when sorting, if the identification information is a HARQ process ID, and the one carrying the HARQ process ID of the predecessor MAC PDU of the MAC PDU sent this time is the MAC PDU sent this time;

The data that carries the HARQ process ID of the subsequent MAC PDU or does not carry the HARQ process ID of the subsequent MAC PDU is retransmitted data.

In implementation, the receiving module is further used to receive the HARQ process ID in the DCI through the PDCCH, or to receive the HARQ process ID by carrying it in the MAC CE.

During implementation, it further includes:

The reassembly module is used to reassemble the data packets according to the sorting result until all the data packets are reassembled and delivered or stop reassembling when they are not received correctly.

In implementation, the reassembly module is further used to establish a multi-layer cache mechanism for each HARQ process, and to reassemble data packets according to the sorting results.

In implementation, the reassembly module is further used to deliver the received PDU to the upper layer in the order of each upper layer's PDU.

For the convenience of description, the various parts of the above-mentioned device are divided into various modules or units according to their functions and described separately. Of course, when implementing the present invention, the functions of each module or unit can be implemented in the same or multiple software or hardware.

A computer-readable storage medium is also provided in an embodiment of the present invention, characterized in that the computer-readable storage medium stores a computer program for executing the above-mentioned data sending method and/or data receiving method.

In the specific implementation, reference may be made to the implementation of the MAC transmitting end data transmitting method and/or the MAC receiving end data receiving method.

In summary, an embodiment of the present invention provides a MAC PDU sorting scheme for HARQ multi-processes;

Provides two sorting schemes for HARQ multi-process sorting: 1. Sorting of upper layer data packets contained in MAC SDU; 2. Sorting between MAC PDUs between different processes;

Further, a scheme for the transmitting end of case 2 is provided: a scheme for identifying predecessor and successor data packets in different HARQ process sorting, and a scheme for sequential recording of HARQ processes in out-of-order transmission are provided;

The receiving end solution of case 2: provides the HARQ Process receiving sorting scheme, the definition method of the HARQ Process process cache, and the scheme for submitting the data packet to its upper layer after parsing;

Through MAC sorting, the scope of upper layer disorder is reduced.

MAC sorting can trigger MAC to introduce more mechanisms for fast data transmission, thereby reducing latency.

Under the premise of ensuring the flexible use of HARQ process, the data packets are sorted.

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

The present invention is described with reference to the flowchart and/or block diagram of the method, device (system), and computer program product according to the embodiment of the present invention. It should be understood that each process and/or box in the flowchart and/or block diagram, as well as the combination of the process and/or box in the flowchart and/or 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 produce a device for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (18)

1. A data transmission method, comprising:

determining the bearing and/or the process of a media access control protocol data unit (MAC PDU) sent to a lower layer;

transmitting according to the bearing and/or the process in sequence;

The sending according to the bearer and/or the process in sequence includes:

for one or more upper layer PDUs of the same upper layer bearer transmission contained in each media access control service data unit (MAC SDU), constructing the MAC PDUs according to the sequence received from the upper layer and then transmitting the MAC PDUs;

When transmitting among different processes, transmitting the MAC layer by taking the upper layer bearing unit of one or more data packets borne by the upper layer contained in the MAC SDU in the MAC PDU transmitted by the different processes according to the sequence received from the upper layer bearing;

When transmitting between different processes, further comprising:

when each MAC PDU is transmitted, the identification information of the MAC PDU precursor and/or the subsequent MAC PDU is carried.

2. The method of claim 1, wherein the identification information of the predecessor and/or successor MAC PDUs comprises one or a combination of the following information:

the hybrid automatic repeat request HARQ process identification ID of the MAC PDU is sent, the sequence number of the data packet is sent, one or a combination of a subframe number, a frame number, a symbol index and a time slot number of an air interface is sent, the air interface time-frequency domain resource information of a physical downlink control channel PDCCH is sent, and the air interface time-frequency domain resource information of a physical downlink shared channel PDSCH is sent.

3. The method of claim 2, wherein each MAC PDU is transmitted with identification information of the MAC PDU precursor and/or subsequent MAC PDU, comprising:

If the identification information is the sequence number of the MAC PDU, carrying the sequence number of the current MAC PDU in the MAC PDU;

If the identification information is one or a combination of the following information, carrying the identification information by carrying out data transmission according to the air interface time sequence relation: a subframe number, a frame number, a symbol index, a time slot number of a null interface, null interface time-frequency domain resource information of a PDCCH and null interface time-frequency domain resource information of a PDSCH;

If the identification information is the HARQ process ID, the precursor and/or the subsequent HARQ process ID is carried.

4. The method of claim 3, wherein if the identification information is an HARQ process ID, the HARQ process ID of a precursor MAC PDU of the MAC PDU to be transmitted at this time is carried when control information of the MAC PDU to be transmitted at this time is constructed;

When retransmitting data, the HARQ process ID of the subsequent MAC PDU is carried, or the HARQ process ID of the subsequent MAC PDU is not carried.

5. A method according to claim 3, characterized in that the HARQ process ID is sent on the PDCCH in the downlink control information DCI or carried by the medium access control element MAC CE.

6. A data receiving method, comprising:

Receiving a MAC PDU;

Determining the bearing and/or the process of the MAC PDU;

Ordering the received MAC PDU according to the bearing and/or the process in sequence;

the ordering of the received MAC PDUs in order according to the bearers and/or procedures includes:

For one or more upper layer PDUs of the same upper layer bearer transmission contained in each MAC SDU, sequencing the MAC SDUs in the received MAC PDU according to the receiving sequence;

When the different processes are received, ordering the data packets carried by one or more upper layers contained in the MAC SDUs in the MAC PDU sent by the different processes by taking the upper layer carrying unit as a unit, and ordering the MAC SDUs in the received MAC PDU by taking the upper layer carrying unit as a unit according to the receiving sequence;

Upon receipt of the different processes, further comprising:

When each MAC PDU is received, the sequence is ordered according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDU.

7. The method of claim 6, wherein the identification information of the predecessor and/or successor MAC PDUs comprises one or a combination of the following information:

The HARQ process ID of the MAC PDU, the sequence number of the data packet, one or a combination of a subframe number, a frame number, a symbol index and a time slot number of a null interface, the null interface time-frequency domain resource information of the PDCCH and the null interface time-frequency domain resource information of the PDSCH are transmitted.

8. The method of claim 7, wherein ordering based on identification information of a precursor and/or a subsequent MAC PDU carried by the MAC PDU comprises:

if the identification information is the sequence number of the MAC PDU, sequencing according to the sequence number of the current MAC PDU carried in the MAC PDU;

If the identification information is one or a combination of the following information, determining the carried identification information according to the air interface time sequence relation when receiving: a subframe number, a frame number, a symbol index, a time slot number of a null interface, null interface time-frequency domain resource information of a PDCCH and null interface time-frequency domain resource information of a PDSCH;

And if the identification information is the HARQ process ID, sequencing according to the carried predecessor and/or the subsequent HARQ process ID.

9. The method of claim 8, wherein if the identification information is a HARQ process ID, the HARQ process ID carrying a precursor MAC PDU of the MAC PDU being transmitted at the time is the MAC PDU being transmitted at the time;

the HARQ process ID of the subsequent MAC PDU is carried or the HARQ process ID of the subsequent MAC PDU is not carried, and the data is retransmitted.

10. The method of claim 8, wherein the HARQ process ID is received through a PDCCH in the DCI or is received through a MAC CE bearer.

11. The method of any one of claims 6 to 10, further comprising:

and (5) carrying out data packet reorganization according to the sorting result until all data packets are reorganized and submitted or stopping reorganization when the data packets are not received correctly.

12. The method as recited in claim 11, further comprising:

and each HARQ process is provided with a multi-layer buffer mechanism, and data packet reorganization is carried out according to the sequencing result.

13. The method as recited in claim 11, further comprising:

And delivering the received PDU to the upper layer according to the PDU sequence of each upper layer.

14. A MAC layer, comprising:

a processor for reading the program in the memory, performing the following process:

determining the bearing and/or the process of the MAC PDU sent to the lower layer;

transmitting according to the bearing and/or the process in sequence;

A transceiver for receiving and transmitting data under the control of the processor;

The sending according to the bearer and/or the process in sequence includes:

for one or more upper layer PDUs of the same upper layer bearer transmission contained in each media access control service data unit (MAC SDU), constructing the MAC PDUs according to the sequence received from the upper layer and then transmitting the MAC PDUs;

When transmitting among different processes, transmitting the MAC layer by taking the upper layer bearing unit of one or more data packets borne by the upper layer contained in the MAC SDU in the MAC PDU transmitted by the different processes according to the sequence received from the upper layer bearing;

When transmitting between different processes, further comprising:

when each MAC PDU is transmitted, the identification information of the MAC PDU precursor and/or the subsequent MAC PDU is carried.

15. A MAC layer, comprising:

A sending determining module, configured to determine a bearer and/or a procedure of a MAC PDU sent to a lower layer;

the sending module is used for sending according to the bearing and/or the progress in sequence;

the sending module is further configured to, when sending in sequence according to the bearer and/or the procedure, include:

for one or more upper layer PDUs of the same upper layer bearer transmission contained in each media access control service data unit (MAC SDU), constructing the MAC PDUs according to the sequence received from the upper layer and then transmitting the MAC PDUs;

When transmitting among different processes, transmitting the MAC layer by taking the upper layer bearing unit of one or more data packets borne by the upper layer contained in the MAC SDU in the MAC PDU transmitted by the different processes according to the sequence received from the upper layer bearing;

The sending module is further configured to carry identification information of the MAC PDU precursor and/or the subsequent MAC PDU when each MAC PDU is sent.

16. A MAC layer, comprising:

a processor for reading the program in the memory, performing the following process:

Receiving a MAC PDU;

Determining the bearing and/or the process of the MAC PDU;

Ordering the received MAC PDU according to the bearing and/or the process in sequence;

A transceiver for receiving and transmitting data under the control of the processor;

the ordering of the received MAC PDUs in order according to the bearers and/or procedures includes:

For one or more upper layer PDUs of the same upper layer bearer transmission contained in each MAC SDU, sequencing the MAC SDUs in the received MAC PDU according to the receiving sequence;

When the different processes are received, ordering the data packets carried by one or more upper layers contained in the MAC SDUs in the MAC PDU sent by the different processes by taking the upper layer carrying unit as a unit, and ordering the MAC SDUs in the received MAC PDU by taking the upper layer carrying unit as a unit according to the receiving sequence;

Upon receipt of the different processes, further comprising:

When each MAC PDU is received, the sequence is ordered according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDU.

17. A MAC layer, comprising:

A receiving module, configured to receive a MAC PDU;

A receiving determining module, configured to determine a bearer and/or a procedure of the MAC PDU;

The ordering module is used for ordering the received MAC PDU according to the bearing and/or the process in sequence;

the ordering module is further configured to, when ordering the received MAC PDUs in order according to the bearers and/or procedures, include:

For one or more upper layer PDUs of the same upper layer bearer transmission contained in each MAC SDU, sequencing the MAC SDUs in the received MAC PDU according to the receiving sequence;

When the different processes are received, ordering the data packets carried by one or more upper layers contained in the MAC SDUs in the MAC PDU sent by the different processes by taking the upper layer carrying unit as a unit, and ordering the MAC SDUs in the received MAC PDU by taking the upper layer carrying unit as a unit according to the receiving sequence;

The ordering module is further used for ordering according to the identification information of the predecessor and/or the successor MAC PDU carried by the MAC PDU when each MAC PDU is received when the ordering module receives the MAC PDU.

18. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for executing the method of any one of claims 1 to 13.