CN114640426A

CN114640426A - Data sending and receiving method, media access control layer and storage medium

Info

Publication number: CN114640426A
Application number: CN202011479363.XA
Authority: CN
Inventors: 孙军帅
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2022-06-17
Also published as: WO2022127596A1

Abstract

The invention discloses a data sending and receiving method, an MAC layer and a storage medium, comprising: determining the load and/or process of the MAC PDU transmitted to the lower layer; and sending according to the load and/or the process in sequence. Receiving the MAC PDU; determining the load and/or process of the MAC PDU; and sequencing the received MAC PDUs according to the load and/or the process in sequence. The invention can shorten the SN length, reduce the overhead of transmitting long SN, and reduce the overhead of sequencing window, time in sequencing and storage buffer. And the MAC can be triggered to introduce more mechanisms for fast data transmission, so that the time delay is reduced. On the premise of ensuring the flexible use of the HARQ process, the data packet sequencing is realized.

Description

Data sending and receiving method, media access control layer and storage medium

Technical Field

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

Background

In fig. 5G, the MAC (Media Access Control) does not have a sorting scheme. The MAC at the transmitting end constructs a MAC PDU (Protocol Data Unit) from Data on different RBs (Radio Bearer) or LGCH (Logical Channel) of the user according to the scheduling result, and selects an available HARQ (Hybrid automatic repeat request) process to transmit to the receiving end. After receiving the MAC PDU on the corresponding HARQ process, the MAC of the receiving end sends the MAC SDU obtained by analysis to the upper layer, and the upper layer carries out sequencing.

The disadvantage of the prior art is that the way the MACs are not ordered results in an increasing overhead after some of the newly introduced techniques.

Disclosure of Invention

The invention provides a data sending and receiving method, an MAC layer and a storage medium, which are used for solving the problem that the system overhead is larger and larger due to the mode that the MAC is not sequenced.

The invention provides the following technical scheme:

a method of data transmission, comprising:

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

and sending according to the load and/or the process in sequence.

In implementation, the sending is performed in sequence according to the bearer and/or the process, and includes:

for one or more upper layer PDUs (protocol data units) which are transmitted by the same upper layer bearer and contained in each MAC SDU, the MAC PDUs are constructed and transmitted according to the sequence received from the upper layer;

when transmitting between different processes, transmitting the MAC layer by taking the upper layer load as a unit according to the sequence received from the upper layer load for one or more data packets loaded by the upper layer and contained in the MAC SDU in the MAC PDU transmitted by different processes.

In the implementation, when sending between different processes, the method further comprises the following steps:

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

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

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

In implementation, when each MAC PDU is sent, the identification information of the preceding MAC PDU and/or the succeeding MAC PDU is carried, which includes:

if the identification information is the serial number of the MAC PDU, carrying the serial 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: sub-frame number, symbol index, time slot number of an air interface, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

and if the identification information is the HARQ process ID, carrying the precursor and/or subsequent HARQ process ID.

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

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

In implementation, the HARQ process ID is transmitted in the DCI through the PDCCH, or is carried by the MAC CE.

A data receiving method, comprising:

receiving the MAC PDU;

determining the load and/or process of the MAC PDU;

and sequencing the received MAC PDUs according to the load and/or the process in sequence.

In implementation, the sequencing the received MAC PDUs in order according to the bearers and/or processes includes:

for one or more upper layer PDUs (protocol data units) which are transmitted by the same upper layer bearer and contained in each MAC SDU, sequencing the MAC SDUs in the received MAC PDUs according to the receiving sequence;

when receiving between different processes, the data packets carried by one or more upper layers contained in the MAC SDU in the MAC PDU sent by different processes are sorted by taking the upper layer carrying as a unit according to the receiving sequence.

In an implementation, when between different processes, the method further comprises:

and when each MAC PDU is received, sequencing according to the identification information of the precursor and/or subsequent MAC PDUs carried by the MAC PDU.

In the implementation, the sequencing is performed according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDUs, and comprises the following steps:

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

if the identification information is one of the following information or the combination of the following information, determining the carried identification information according to the air interface timing relationship during receiving: sub-frame number, symbol index, time slot number of an air interface, air interface time-frequency domain resource information of a PDCCH, and air interface time-frequency domain resource information of a PDSCH;

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

In implementation, if the identification information is the HARQ process ID, the HARQ process ID of the predecessor MAC PDU of the MAC PDU that is sent this time is carried, and the MAC PDU that is sent this time is carried;

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 retransmission data is carried.

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

In an implementation, the method further comprises the following steps:

and performing data packet reassembly according to the sequencing result until all data packets are reassembled and delivered or when the data packets are not received correctly, stopping reassembling.

In an implementation, the method further comprises the following steps:

and each HARQ process establishes a multi-layer cache mechanism and performs data packet recombination according to the sequencing result.

In an implementation, the method further comprises the following steps:

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

A MAC layer, comprising:

a processor for reading the program in the memory and executing the following processes:

determining the load and/or process of the MAC PDU transmitted to the lower layer;

sending the data according to the load and/or the process in sequence;

a transceiver for receiving and transmitting data under the control of the processor.

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: sub-frame number, symbol index, time slot number of an air interface, air interface time-frequency domain resource information of a PDCCH, and air interface time-frequency domain resource information of a PDSCH;

and if the identification information is the HARQ process ID, carrying the previous and/or subsequent HARQ process ID.

A MAC layer, comprising:

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

and the sending module is used for sending in sequence according to the load and/or the process.

In an implementation, the sending module is further configured to, when sending according to the bearer and/or the process in sequence, include:

for one or more upper layer PDUs carried and transmitted by the same upper layer contained in each MAC SDU, the MAC PDUs are constructed and then transmitted according to the sequence received from the upper layer;

In an implementation, the sending module is further configured to carry identification information of the MAC PDU predecessor and/or successor MAC PDUs when sending each MAC PDU.

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

In an implementation, the sending module is further configured to, when sending each MAC PDU and carrying the identification information of the MAC PDU predecessor and/or successor, include:

In implementation, the sending module is further configured to, during sending, carry the HARQ process ID of a precursor MAC PDU of the MAC PDU to be sent this time when the control information of the MAC PDU to be sent this time is established if the identification information is the HARQ process ID;

In an implementation, the transmitting module is further configured to transmit the HARQ process ID through the PDCCH on the DCI, or, carry and transmit the HARQ process ID through the MAC CE.

A MAC layer, comprising:

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

receiving the MAC PDU;

determining the load and/or process of the MAC PDU;

sequencing the received MAC PDUs according to the load and/or the process in sequence;

In the implementation, when between different processes, further comprising:

if the identification information is one of the following information or the combination of the following information, determining the carried identification information according to the air interface timing relationship during receiving: sub-frame number, symbol index, time slot number of an air interface, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

In the implementation, if the identification information is the HARQ process ID, the identification information carries the HARQ process ID of the precursor MAC PDU of the MAC PDU which is sent at this time and is the MAC PDU which is sent at this time;

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

In an implementation, the method further comprises the following steps:

and each HARQ process establishes a multi-layer cache mechanism and performs data packet reassembly according to the sequencing result.

In an implementation, the method further comprises the following steps:

the upper layer is delivered in the order of each of the received PDUs.

A MAC layer, comprising:

a receiving module for receiving the MAC PDU;

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

and the sequencing module is used for sequencing the received MAC PDU according to the load and/or the process in sequence.

In an implementation, the sorting module is further configured to, when sorting the received MAC PDUs in order according to the bearers and/or processes, include:

In an implementation, the sorting module is further configured to, when receiving each MAC PDU among different processes, sort according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDU.

In an implementation, the ordering module is further configured to order the MAC PDUs according to the identification information of the preceding and/or succeeding MAC PDUs including one or a combination of the following information:

In an implementation, the sequencing module is further configured to, when performing sequencing according to the identification information of the predecessor and/or successor MAC PDUs carried in the MAC PDU, include:

In implementation, the sequencing module is further configured to, during sequencing, if the identification information is an HARQ process ID, carry the HARQ process ID of a predecessor MAC PDU of the MAC PDU that is sent this time, and be the MAC PDU that is sent this time;

In an implementation, the receiving module is further configured to receive, on the DCI, the HARQ process ID through the PDCCH, or receive, on the MAC CE, the HARQ process ID.

In an implementation, the method further comprises the following steps:

and the recombination module is used for recombining the data packets according to the sequencing result until all the data packets are recombined to finish delivery or the recombination is stopped when the data packets are not correctly received.

In implementation, the reassembly module is further configured to set up a multi-layer cache mechanism for each HARQ process, and reassemble the data packet according to the sequencing result.

In an implementation, the reassembly module is further configured to deliver the received PDUs to the upper layer in the order of each of the upper layer PDUs.

A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the above-described data transmission method and/or data reception method.

The invention has the following beneficial effects:

in the technical scheme provided by the embodiment of the invention, the transmission is carried out in sequence according to the load and/or the process of the MAC PDU during the transmission; and when receiving, sequencing the received MAC PDUs according to the load and/or the process in sequence, thereby realizing MAC sequencing, reducing the range of upper-layer disorder, shortening the SN length, reducing the overhead of transmitting long SN, and reducing the overhead of sequencing window, sequencing middle time and storage buffer.

Furthermore, through MAC sequencing, more mechanisms can be triggered to be introduced into the MAC for rapid data transmission, so that the time delay is reduced.

Furthermore, on the premise of ensuring the flexible use of the HARQ process, the sequencing of the data packets is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:

fig. 1 is a schematic diagram of an implementation flow of a data transmission method on a MAC at a transmitting end in an embodiment of the present invention;

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

FIG. 3 is a diagram illustrating MAC HARQ multi-process transceiving of MAC PDUs in an embodiment of the present invention;

fig. 4 is a diagram illustrating MAC HARQ process caching and ordering in an embodiment of the present invention;

FIG. 5 is a diagram illustrating a structure of a MAC layer according to an embodiment of the present invention;

fig. 6 is a diagram illustrating a structure of a MAC layer two according to an embodiment of the present invention.

Detailed Description

The inventor notices in the process of invention that:

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

DC (Dual Connectivity) and MC (multi Connectivity) are introduced in 5G, and the overhead caused by ordering due to packet misordering is increasing, for example, the PDCP of 5G introduces SN (Sequence Number) Number with 18 bits length. If the disorder can be reduced, the SN length can be shortened, the overhead of transmitting long SN can be reduced, and the overhead of sequencing window, time in sequencing and storage buffer can be reduced.

Based on this, the embodiment of the invention provides a method for sequencing MAC PDUs in a mode of the sequence of the MAC process selected in the MAC scheduling when HARQ multi-process transmission is carried out, thereby ensuring the ordered reception of MAC layer data packets and reducing the sequencing overhead on a link.

The following describes embodiments of the present invention with reference to the drawings.

In the description process, the implementation of the MAC sides of the transmitting end and the receiving end will be described separately, and then an example of the implementation of the MAC sides of the transmitting end and the receiving end will be given to better understand the implementation of the scheme provided in the embodiment of the present invention. Such an explanation does not mean that the two must be implemented in cooperation or separately, and actually, when the transmitting-side MAC and the receiving-side MAC are implemented separately, the problems of the transmitting-side MAC and the receiving-side MAC are solved separately, and when the two are used in combination, a better technical effect is 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, the data transmission method includes:

step 101, determining the load and/or process of the MAC PDU sent to the lower layer;

and 102, sending according to the load and/or the process in sequence.

Fig. 2 is a schematic flow chart of an implementation of a data receiving method on a receiving end MAC, as shown in the figure, the data receiving method includes:

step 201, receiving MAC PDU;

step 202, determining the load and/or process of the MAC PDU;

and 203, sequencing the received MAC PDUs according to the load and/or the process in sequence.

Specifically, the pressure of packet sequencing at the upper layer of the MAC layer is reduced by sequencing the packets out of order based on HARQ multiprocessing at the MAC layer.

The sending sequence of the data packets can be controlled by the MAC scheduler during scheduling, so that the receiving and sequencing of the disordered data packets by the MAC layer of the receiving end are realized.

The implementation of the HARQ multi-process MAC PDU ordering scheme is explained below.

In implementation, on the sending end MAC, sending is performed in sequence according to the bearer and/or the process, and includes:

Correspondingly, the MAC at the receiving end has a function of ordering the received MAC PDUs according to the bearer and/or the process in sequence, which includes:

Specifically, the MAC PDU (Protocol Data Unit) includes Data content MAC SDUs (Service Data Unit), and each MAC SDU includes a PDU of an upper layer of the MAC layer. Each MAC SDU may contain Data packets on one or more upper bearers (one MAC SDU in 5G can only carry Data of one upper Bearer (logical channel or DRB), which may break this limitation in future communication systems). Each MAC SDU may contain one or more upper layer PDUs of the same upper layer bearer transport (the upper layer with MAC in 5G encapsulates the upper layer SDUs into one upper layer PDU, i.e. contains only one upper layer PDU).

That is, the MAC layer completes the ordering of two layers based on the HARQ multithread ordering scheme:

case 1, ordering of upper layer packets contained in MAC SDUs: and sequencing one or more upper layer PDUs (protocol data units) of the same upper layer bearer transmission contained in each MAC SDU. The transmission and reception of the MAC layer are performed in the order of reception from the upper layer.

Case 2, ordering between MAC PDUs of different processes: when sending between different processes, sorting data packets carried by one or more upper layers contained in the MAC SDU in the MAC PDU sent by different processes by taking the upper layer as a unit. The transmission and reception of the MAC layer are performed in the order of reception from the upper layer bearer.

Fig. 3 is a schematic diagram of MAC HARQ multi-process transceiving MAC PDUs, and as shown in the figure, fig. 3 shows a schematic diagram of transceiving MAC PDUs using HARQ multi-process.

Wherein, TB (Transport Block) is a data Block, i.e., MAC PDU, transmitted by each HARQ process.

The MAC scheduler selects one available HARQ process at a time to transmit data, so the MAC scheduler is not process-selective in the order of HARQ process IDs. In FIG. 3, process # 1 is not used because process n-1# gets ACK (Acknowledgement) feedback in time after sending data and becomes an "available process". And when the HARQ process is determined, establishing the MAC PDU.

For case 1 (ordering of upper layer packets contained by MAC SDUs):

1. when a sending end MAC builds up MAC PDU, the MAC PDU is built according to the sequence of the upper layer PDU received from the upper layer of the MAC.

2. When the receiving end MAC analyzes the MAC PDU, the receiving end MAC delivers data to an upper layer according to the sequence of different data units in the MAC SDU.

The ordering implementation for case 2 (ordering between different inter-process MAC PDUs) may then be as follows:

in the implementation, when sending between different processes on the MAC of the sending end, the method further includes:

when each MAC PDU is sent, the identification information of the MAC PDU predecessor and/or successor MAC PDUs is carried.

Correspondingly, when the MAC at the receiving end receives messages from different processes, the method further includes:

1. When the MAC of the sending end sends each MAC PDU to the lower layer, the identification information of the precursor and/or the successor MAC PDU of the MAC PDU is carried.

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

Next, the implementation of the transmitting-end MAC in case 2 will be described.

Specifically, the identification information of the preceding and/or subsequent MAC PDU may be an HARQ process id (process id) for sending the MAC PDU, or a sequence number for sending the data packet, or one or a combination of several of a subframe number (Sub Frame), a Frame number (Frame), a Symbol index (Symbol), and a Time Slot number (Time Slot) of an air interface, or air interface Time frequency domain resource information of a PDCCH (Physical downlink control channel) or a PDSCH (Physical downlink shared channel).

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

In specific implementation, when each MAC PDU is sent, the identification information of the preceding and/or succeeding MAC PDU of the MAC PDU is carried, which includes:

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

Specifically, if the MAC PDU is the sequence number of the MAC PDU, the sequence number of the current MAC PDU only needs to be carried in the MAC PDU, and the sequence number of the predecessor and/or successor MAC PDU does not need to be carried, because the sequence number itself contains the context.

If the identifier is the identifier related to the air interface timing sequence, that is, one or a combination of several of a subframe number (Sub Frame), a Frame number (Frame), a Symbol index (Symbol), and a Time Slot number (Time Slot) of the air interface, or the air interface Time-frequency domain resource information of the PDCCH/PDSCH, the MAC PDU does not need to be carried with the above information, and only data transmission is performed according to the air interface timing sequence relationship. The receiver can determine the predecessor and/or successor MAC PDU corresponding to the MAC PDU received this time according to the related identification of the air interface time sequence where the received PDCCH or PDSCH is located or the air interface time-frequency domain resource information, because the air interface time sequence relationship itself contains the front-back relationship.

If the process ID is HARQ process ID, it needs to carry precursor and/or subsequent process ID, because the MAC does not select available HARQ process according to the precedence relationship of the process ID when sending. When the control information of the MAC PDU to be sent at this time is established, the MAC determines the HARQ process ID of a precursor MAC PDU of the MAC PDU to be sent at this time. When the data is retransmitted, the subsequent HARQ process ID may be carried or not carried.

When the MAC scheduler schedules, if a MAC PDU is newly transmitted (newly transmitted), the HARQ ID (precursor HARQ process ID) used in the next scheduling is carried by the MAC PDU. If the MAC PDU is retransmitted (retransmitted), the HARQ ID used in the next scheduling (precursor HARQ process ID) and/or the next process ID carried by the MAC PDU is carried.

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

HARQ process ID transmission method: the precursor and/or subsequent HARQ process ID may be newly added to DCI (Downlink Control Information) carrying Control Information, and transmitted through a PDCCH channel. An MAC CE (media access Control Element, CE: Control Element) type may be added to carry the ID of the new precursor and/or subsequent HARQ process.

Next, the implementation of the receiving-side MAC in case 2 will be described.

if the identification information is one of the following information or the combination of the following information, the identification information implicitly carried is determined through the air interface time sequence relation during receiving: sub-frame number, symbol index, time slot number of an air interface, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

In specific implementation, if the identification information is the HARQ process ID, the HARQ process ID of the predecessor MAC PDU of the MAC PDU that is sent this time is carried, and the MAC PDU that is sent this time is carried;

In a specific implementation, the HARQ process ID is received on the DCI via the PDCCH, or is carried by the MAC CE.

Specifically, the ordering is performed according to the identification information of the predecessor and/or successor MAC PDUs. And sequencing the MAC PDU received at this time to the next rear according to the precursor information. If the identification information of the successor is carried, the identification information can be used for confirming whether the successor is correct, and therefore the sequencing position of the MAC PDU is further confirmed.

If the sequence number is the MAC PDU sequence number, the corresponding position is directly inserted according to the sequence number;

if the identifier is the identifier related to the air interface time sequence, determining a sequencing position according to the constraint relation;

if the process ID is the HARQ process ID, the process ID points to the corresponding HARQ process;

whether the sending end sends the identification information of the subsequent MAC PDU or not, when the receiving end stores the received MAC PDU, if the MAC PDU has predecessor (the first newly-transmitted data packet has no predecessor) or successor (the last newly-transmitted data packet has no successor, the identification information can be updated into the predecessor MAC PDU after the successor data packet arrives in the data exchange process), the predecessor and successor relation of the MAC PDU is established.

In the implementation, the method can further comprise the following steps:

Specifically, the data packet reassembly is performed according to the sorting result. If the precursor data packet has been received correctly (including the data packet which has been delivered to the upper layer of the MAC), the MAC PDU is analyzed to obtain the corresponding MAC SDU and the PDU of the upper layer contained in the MAC PDU, and the MAC SDU and the PDU are delivered to the upper layer of the MAC in sequence. Reading the subsequent MAC PDU of the MAC PDU, if the MAC PDU is received correctly, analyzing the MAC PDU to obtain the corresponding MAC SDU and the PDU of the upper layer contained in the MAC SDU, and delivering the MAC SDU and the PDU of the upper layer to the upper layer of the MAC in sequence. And continuously reading the subsequent MAC PDU until all the data packets are recombined and delivered or not received correctly, and stopping recombination.

In the implementation, the method can further comprise the following steps:

Specifically, each HARQ process establishes a multi-layer buffer mechanism to realize the in-sequence packet reassembly function.

Fig. 4 is a schematic diagram of MAC HARQ process buffering and ordering, and as shown in the figure, fig. 4 provides a schematic diagram of buffering function of each HARQ process. Wherein the bidirectional arrowed line in the horizontal direction of type a indicates the relationship of predecessor and successor of MAC PDUs in the buffer of the HARQ process. The bi-directional arrow lines in the type B vertical direction indicate the relationship of different rounds of buffered MAC PDUs of one HARQ process. The type C single arrow diagonal line represents the index relationship between one HARQ process and its buffer.

The sorting is carried out in the guide direction of the bidirectional arrow line in the A-shaped horizontal direction. After the previous MAC PDU of a process finishes sequencing delivery, the C line is guided to the next MAC PDU waiting for sequencing (Buffer) according to the guidance of the B line.

For the retransmitted data packet, if the retransmission is not successful all the time, the retransmission can be discarded at the MAC layer, and the retransmission and the sequencing are performed by the upper layer of the MAC. If the information of the sending end and the receiving end is inconsistent because the receiving end cannot receive the information due to information loss during air interface transmission, for example, the sending end sends a data packet due to the loss of the PDCCH, and the receiving end does not sense (i.e., the receiving end does not know that the opposite end sends the data packet) and sends the data packet to the sending end, the disorder can be performed by the upper layer of the MAC.

In the implementation, the method can further comprise the following steps:

the upper layer is delivered in the order of each of the received PDUs.

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

Based on the same inventive concept, the embodiment of the present invention further provides an MAC layer and a computer readable storage medium, and because the principle of solving the problem of these devices is similar to that of the data transmission method and the data reception method, the implementation of these devices may refer to the implementation of the methods, and the repeated parts are not described again.

When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.

Fig. 5 is a structural diagram of a MAC layer, as shown in the figure, the MAC layer includes:

the processor 500, which is used to read the program in the memory 520, executes the following processes:

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

sending the data according to the load and/or the process in sequence;

a transceiver 510 for receiving and transmitting data under the control of the processor 500.

In implementation, when each MAC PDU is sent, the identification information of the MAC PDU predecessor and/or successor MAC PDUs is carried, which includes:

Wherein in fig. 5 the bus architecture may comprise any number of interconnected buses and bridges, in particular one or more processors, represented by the processor 500, and various circuits, represented by the memory 520, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over 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 in performing operations.

The embodiment of the invention also provides a MAC layer, which comprises:

In an implementation, the transmitting module is further configured to transmit the HARQ process ID through the PDCCH on the DCI, or carry the HARQ process ID through the MAC CE.

For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in the practice of the invention.

Fig. 6 is a schematic structural diagram of a MAC layer two, as shown in the figure, the MAC layer includes:

the processor 600, which is used to read the program in the memory 620, executes the following processes:

receiving the MAC PDU;

determining the load and/or process of the MAC PDU;

a transceiver 610 for receiving and transmitting data under the control of the processor 600.

In the implementation, when between different processes, further comprising:

and when each MAC PDU is received, sequencing is carried out according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDUs.

the HARQ process ID of the MAC PDU, the transmitted serial number of the data packet, one or the combination of the sub-frame number, the symbol index and the time slot number of the air interface, the air interface time frequency domain resource information of the PDCCH and the air interface time frequency domain resource information of the PDSCH are transmitted.

if the identification information is one of the following information or the combination of the following information, determining the carried identification information according to the air interface time sequence relation during receiving: sub-frame number, symbol index, time slot number of an air interface, air interface time-frequency domain resource information of PDCCH, and air interface time-frequency domain resource information of PDSCH;

In an implementation, the method further comprises the following steps:

and recombining the data packets according to the sequencing result until all the data packets are recombined and delivered or when the data packets are not received correctly, stopping recombining.

In an implementation, the method further comprises the following steps:

the upper layer is delivered in the order of each of the received PDUs.

Where in fig. 6, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over 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 in performing operations.

The embodiment of the invention also provides a MAC layer, which comprises:

a receiving module for receiving the MAC PDU;

In an implementation, the sorting module is further configured to, when receiving each MAC PDU during reception among different processes, sort according to the identification information of the preceding and/or succeeding MAC PDU carried by the MAC PDU.

In an implementation, the sorting module is further configured to, when sorting is performed according to the identification information of the predecessor and/or successor MAC PDUs carried by the MAC PDUs, include:

In an implementation, the method further comprises the following steps:

and the recombination module is used for recombining the data packets according to the sequencing result until all the data packets are recombined and delivered or the recombination is stopped when the data packets are not correctly received.

In implementation, the reassembly module is further configured to set up a multi-layer cache mechanism for each HARQ process, and perform packet reassembly according to the ordering result.

The embodiment of the present invention further provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium stores a computer program for executing the data transmission method and/or the data reception method.

In specific implementation, reference may be made to implementation of a data sending method at an MAC sending end and/or a data receiving method at an MAC receiving end.

In summary, the present invention provides a HARQ multiprocess MAC PDU ordering scheme;

an ordering scheme for two cases of HARQ multi-process ordering requirements is provided: 1. sorting upper layer packets contained in the MAC SDU; 2. sequencing MAC PDUs among different processes;

further, a scheme of the transmitting end of case 2 is also provided: giving a scheme for identifying precursor and subsequent data packets in different HARQ Process sequences, and recording the scheme in the sequence of the HARQ Process in out-of-sequence transmission;

receiving end scheme of case 2: giving a scheme of HARQ Process receiving and sequencing, a definition mode of HARQ Process caching, and a scheme of submitting to the upper layer after data packet analysis;

the range of upper layer disorder is reduced by MAC sequencing.

Through MAC sequencing, more mechanisms can be introduced into MAC to carry out rapid data transmission, thereby reducing time delay.

On the premise of ensuring the flexible use of the HARQ process, the data packet sequencing is realized.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

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

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

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

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.

Claims

1. A data transmission method, comprising:

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

and sending according to the load and/or the process in sequence.

2. The method of claim 1, wherein transmitting in order according to the bearers and/or processes comprises:

for one or more upper layer PDUs (protocol data units) which are contained in each media access control service data unit MAC SDU and transmitted by the same upper layer bearer, the MAC PDUs are constructed according to the sequence received from the upper layer and then transmitted;

3. The method of claim 2, when transmitting between different processes, further comprising:

4. The method of claim 3, wherein the identification information of the predecessor and/or successor MAC PDUs comprises one or a combination of the following information:

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

5. The method of claim 4, wherein the carrying of the identification information of the MAC PDU predecessor and/or successor MAC PDUs in the transmission of each MAC PDU comprises:

6. The method according to claim 5, wherein if the identification information is a HARQ process ID, carrying the HARQ process ID of a precursor MAC PDU of the MAC PDU to be transmitted this time when the control information of the MAC PDU to be transmitted this time is constructed;

7. The method of claim 5, wherein the HARQ process ID is transmitted on a downlink control information DCI through a PDCCH or is carried by a media access control element MAC CE.

8. A data receiving method, comprising:

receiving the MAC PDU;

determining the load and/or process of the MAC PDU;

9. The method of claim 8, wherein ordering the received MAC PDUs in order according to the bearer and/or process comprises:

10. The method of claim 9, wherein receiving between different processes, further comprises:

11. The method of claim 10, wherein the identification information of the predecessor and/or successor MAC PDUs includes one or a combination of the following information:

12. The method of claim 11, wherein the ordering according to the identification information of the preceding and/or the subsequent MAC PDUs carried by the MAC PDUs comprises:

13. The method according to claim 12, wherein if the identification information is HARQ process ID, the HARQ process ID of the predecessor MAC PDU of the MAC PDU that is transmitted this time is carried, which is the MAC PDU that is transmitted this time;

14. The method of claim 12, wherein HARQ process IDs are received on DCI received over PDCCH or received carried over MAC CE.

15. The method of any of claims 8 to 14, further comprising:

16. The method of claim 15, further comprising:

17. The method of claim 15, further comprising:

the upper layer is delivered in the order of each of the received PDUs.

18. A MAC layer, comprising:

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

sending the data according to the load and/or the process in sequence;

19. A MAC layer, comprising:

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

20. A MAC layer, comprising:

receiving the MAC PDU;

determining the load and/or process of the MAC PDU;

21. 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 process of a MAC PDU;

22. 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 17.