WO2018077195A1

WO2018077195A1 - Method and apparatus for data retransmission, and mac device

Info

Publication number: WO2018077195A1
Application number: PCT/CN2017/107678
Authority: WO
Inventors: 陈艳丽; 黄河; 潘凤艳
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-10-26
Filing date: 2017-10-25
Publication date: 2018-05-03
Also published as: CN107995654A

Abstract

Provided in the present invention are a method and apparatus for data retransmission, and a media access control (MAC) device. The data retransmission method comprises: if the retransmission of a media access control service data unit (MAC SDU) fails, detecting whether the failure waiting time of the MAC SDU has timed out; if the judgment result is no, retransmitting the MAC SDU and/or relevant data of the MAC SDU. The present invention solves the problems in the related art that a two-layer retransmission mechanism may delay the timely submission of service data to an application layer, and affect the quality of service (QoS) of the service, thereby achieving the effect of expediting the submission of the data to the application layer and improving the QoS of the service.

Description

Data retransmission method and device, MAC device

Technical field

The present invention relates to the field of communications, and in particular to a data retransmission method and apparatus, and a MAC device.

Background technique

The mobile communication network is facing an expansive growth of terminal data traffic. The construction of 5G networks needs to achieve ultra-high speed, high throughput, ultra-high reliability, ultra-low latency and other indicators to provide users with the best experience. These requirements make The service capabilities and deployment strategies of mobile networks are facing tremendous pressures and challenges. On the one hand, operators need to enhance existing network deployment and communication technologies. On the other hand, they hope to accelerate the promotion of new technologies and network expansion, so as to rapidly improve the network. The purpose of performance.

In LTE, a two-layer retransmission mechanism is introduced to ensure correct reception of data: RLC ARQ (Radio Link Control Automatic Repeat request) and MAC HARQ (Media Access Control Hybrid Automatic Repeat request) Access control hybrid automatic resend request). In the MAC HARQ mechanism, the MAC receiver receives the data and determines the correctness of the data and then performs data feedback HARQ ACK/NACK; the MAC sender completes the retransmission of the MAC data and the transmission of the new data according to the HARQ ACK/NACK; in the RLC ARQ mechanism, The RLC receiver detects the integrity of the received data from the underlying data, and notifies the RLC ARQ ACK/NACK when data loss or data abnormality is detected; the RLC sender completes the retransmission of the RLC data according to the data feedback. Taking the process of the two-layer retransmission mechanism in the downlink data transmission in the eNodeB (Enhanced Node B) as an example, FIG. 1 is a flowchart of the two-layer retransmission mechanism in the related art. As shown in Figure 1, although the two-layer retransmission mechanism greatly increases the possibility of data transmission, the protocol function hierarchy is clear. However, there is still data monitoring and feedback for each layer of retransmission-dependent peer-to-peer protocol layers, so the high-level retransmission timing is slightly "slow". Because of the sequential requirements of high-level application data, the two-layer retransmission mechanism may delay the delivery of service data to the application layer in time, affecting the problem of service QoS.

Summary of the invention

The embodiment of the invention provides a data retransmission method and device, and a MAC device, to at least solve the problem that the two-layer retransmission mechanism in the related art may delay the delivery of service data to the application layer in time and affect the service QoS.

According to an embodiment of the present invention, a data retransmission method is provided, including: detecting, when a media access control service data unit MAC SDU retransmission fails, detecting whether a failure waiting time of the MAC SDU is timed out; If the result is no, the related data of the MAC SDU and/or the MAC SDU is retransmitted.

According to an embodiment of the present invention, a data retransmission apparatus is provided, including: a detecting module, configured to detect whether a failure waiting time of the MAC SDU expires when the MAC SDU fails to retransmit; The module is configured to resend the related data of the MAC SDU and/or the MAC SDU if the determination result is no.

According to still another embodiment of the present invention, a MAC device is provided, including: a processor, configured to detect, when the MAC SDU retransmission fails, whether a failure waiting time of the MAC SDU is timed out; In the case of no, the MAC SDU and/or the related data of the MAC SDU are retransmitted; the transmission interface is configured to transmit related data of the MAC SDU and/or the MAC SDU.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

S1. When the media access control service data unit MAC SDU fails to retransmit, check whether the failure waiting time of the MAC SDU expires.

S2. If the determination result is no, retransmit the related data of the MAC SDU and/or the MAC SDU.

With the embodiment of the present invention, the related data using the MAC SDU and/or the MAC SDU is retransmitted again within the waiting time after the retransmission fails. Therefore, it can be solved in related technologies The two-layer retransmission mechanism may delay the delivery of service data to the application layer in time, affecting the problem of service QoS, thereby accelerating the delivery of data to the application layer and improving the effect of service QoS.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flow chart of a two-layer retransmission mechanism in the related art;

2 is a block diagram showing the hardware structure of a mobile terminal according to a data retransmission method according to an embodiment of the present invention;

FIG. 3 is a flowchart of a data retransmission method according to an embodiment of the present invention; FIG.

4 is a timing diagram of a data retransmission in accordance with the present invention;

Figure 5 is a timing diagram of another data retransmission in accordance with the present invention;

FIG. 6 is a structural diagram of a data retransmission apparatus according to an embodiment of the present invention; FIG.

FIG. 7 is a structural diagram of another data retransmission apparatus according to an embodiment of the present invention; FIG.

FIG. 8 is a structural diagram of a MAC device according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

The method embodiment provided in Embodiment 1 of the present application can be executed in a mobile terminal, a computer terminal or the like. Taking the operation on the terminal as an example, FIG. 2 is a hardware structural block diagram of a mobile terminal of a data retransmission method according to an embodiment of the present invention. As shown in FIG. 2, the mobile terminal 20 may include one or more (only one shown) processor 202 (the processor 202 may include This includes, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA, a memory 204 configured to store data, and a transmission device 206 configured as a communication function. It will be understood by those skilled in the art that the structure shown in FIG. 1 is merely illustrative and does not limit the structure of the above electronic device. For example, terminal 20 may also include more or fewer components than those shown in FIG. 2, or have a different configuration than that shown in FIG. 2.

The memory 204 can be configured as a software program and a module for storing application software, such as program instructions/modules corresponding to the data retransmission method in the embodiment of the present invention, and the processor 202 executes by executing a software program and a module stored in the memory 204. Various functional applications and data processing, that is, the above methods are implemented. Memory 204 can include high speed random access memory and can also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 204 can further include memory remotely located relative to processor 202, which can be connected to terminal 20 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 206 is arranged to receive or transmit data via a network. The above specific network example may include a wireless network provided by a communication provider of the terminal 10. In one example, transmission device 206 includes a Network Interface Controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 206 can be a Radio Frequency (RF) module for communicating with the Internet wirelessly.

In this embodiment, a data retransmission method running on the mobile terminal is provided. FIG. 3 is a flowchart of a data retransmission method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps. :

Step S302, detecting, when the media access control service data unit MAC SDU retransmission fails, detecting whether the failure waiting time of the MAC SDU expires;

Step S304, if the determination result is no, retransmit the related data of the MAC SDU and/or the MAC SDU.

Optionally, the related data of the MAC SDU refers to the MAC attributed to the MAC SDU. SDU fragment.

Optionally, in the resending process, the related data of the retransmitted MAC SDU and the MAC SDU is sent with a higher priority than the MAC SDU that has not been sent in the MAC PDU.

Optionally, during the retransmission process, the retransmission of the related data of the MAC SDU and the MAC SDU may also be sent in one pass with the MAC SDU that has not been sent in the MAC PDU.

Specifically, in the resending process, for a complete MAC SDU, the complete MAC SDU may be directly retransmitted, and the completed MAC SDU may be split into multiple MAC SDU segments for retransmission. For the MAC SDU segment, the segment can be directly retransmitted, and the complete MAC SDU corresponding to the MAC SDU segment can also be retransmitted.

Optionally, when the retransmission is successful, or when the retransmission fails and the determination result is yes, deleting the MAC SDU and the failure waiting time set for the MAC SDU; the MAC to which the MAC SDU fragment belongs When the SDU retransmission is successful, the MAC SDU to which the MAC SDU fragment belongs and the failure waiting time of the MAC SDU are deleted; if the MAC SDU fragment fails to be retransmitted and the determination result is yes, the MAC SDU to which the MAC SDU fragment belongs In the case that all SDU segments complete retransmission, the MAC SDU to which the MAC SDU segment belongs and the MAC SDU to which the MAC SDU segment belongs are deleted. Specifically, the MAC SDU retransmission to which the MAC SDU segment belongs is that all the MAC SDU segments included in the MAC SDU to which the MAC SDU segment belongs are retransmitted, that is, the meaning of the retransmission success is All MAC SDU fragments are retransmitted successfully. If one or more MAC SDUs have retransmission failures, then the retransmission fails.

Optionally, before step S201, receiving the MAC SDU sent by each logical channel, and setting the failure waiting time for the MAC SDU; encapsulating the MAC SDU, obtaining a MAC protocol data unit PDU, and sending MAC PDU. Specifically, in the encapsulation process, a MAC Control element and Padding are also encapsulated in the MAC PDU.

Specifically, the following scenarios are also provided in this embodiment to facilitate understanding of the technical solutions described in this embodiment:

scene 1

Scenario 1 provides a scenario of MAC SDU fast HARQ of a MAC sender, including the following steps: FIG. 4 is a timing diagram of data retransmission according to the present invention. As shown in FIG. 4, the following steps in scenario 1 are applied to the above. Timing diagram.

S0010 MAC receives high-level data MAC SDU0 and MAC SDU1

S0020 MAC sets DiscardTimer for SDU0 and SDU1 respectively;

The S0030 MAC obtains the next MAC TTI (recorded as TTI1) of the UE according to the air interface allocation capability, and allows the data traffic to be sent;

S0040 MAC determines that TTI1 sends MAC SDU0 to form MAC PDU0; then TTI1 sends;

S0050 MAC PDU0 HARQ failed;

The S0060 MAC obtains the next MAC TTI (recorded as TTI2) of the UE according to the air interface allocation capability, and allows the data traffic to be sent;

The S0070 MAC checks that the DiscardTimer of the MAC SDU0 in the MAC PDU0 has not expired, allowing fast HARQ;

The S0080 MAC determines that the TTI2 sends the MAC SDU0 and the MAC SDU1 to form the MAC PDU1, and the framing is as shown in FIG. 4, and then the TTI2 sends;

S0090 MAC PDU1 HARQ succeeded;

The S0100 MAC deletes the MAC SDU0 and the MAC SDU1 and the corresponding DiscardTimer.

Scene 2

Scenario 2 provides a scenario of MAC SDU Segment fast HARQ of the MAC sender, including the following steps: FIG. 5 is a timing diagram of another data retransmission according to the present invention. As shown in FIG. 5, the following steps are applied in scenario 2c. In the above timing chart.

S0010 MAC receives high layer data in sequence: MAC SDU0 and MAC SDU1 from logical channel 5, MAC SDU2 from logical channel 6;

After receiving the SDUs, the S0020 MAC starts the DiscardTimer respectively.

The S0030 MAC obtains, according to the air interface allocation capability, the data traffic of the next MAC TTI (referred to as TTI1) of the UE to allow the logical channel 5 to be sent;

The S0040 MAC determines that the TSI1 sends the MAC SDU0 of the logical channel 5 and the segment of the MAC SDU1 to form the MAC PDU0. MAC PDU0 is framed as shown in Figure 6, and then sent by TTI1;

S0050 MAC PDU0 HARQ failed;

The S0060 MAC obtains the data traffic of the logical channel 5 and the logical channel 6 by using the next MAC TTI (referred to as TTI2) of the UE according to the air interface allocation capability;

The S0070 MAC checks that the MAC SDU0 DiscardTimer in the MAC PDU0 is invalid, so the MAC SDU0 is deleted; the DiscardTimer of the MAC SDU1 to which the MAC SDU1 Segment belongs is not invalidated, so the MAC SDU1 is not deleted.

The S0080 MAC determines that the partial data of the MAC SDU1 of the TTI2 transmission logical channel 5 and the MAC SDU2 of the logical channel 6 are concatenated into one MAC PDU1. And then TT2 sends.

S0090 MAC PDU1 HARQ succeeded;

The S0100 MAC checks that the MAC SDU1 in the MAC PDU1 still has some data in the HARQ, so the MAC SDU is not deleted; the MAC SDU2 and the corresponding DiscardTimer are deleted.

Through the above steps, the related data using the MAC SDU and/or the MAC SDU is retransmitted again within the waiting time after the retransmission fails. Therefore, the problem that the two-layer retransmission mechanism in the related technology may delay the delivery of service data to the application layer in time and affect the service QoS may be solved, thereby accelerating the delivery of data to the application layer and improving the effect of service QoS.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a plurality of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform various embodiments of the present invention. The method described.

Example 2

In the embodiment, a data retransmission device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 6 is a structural diagram of a data retransmission apparatus according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes: a detection module 62 and a retransmission module 64.

The detecting module 62 is configured to detect, when the MAC SDU retransmission fails, whether the failure waiting time of the MAC SDU expires;

The retransmission module 64 is configured to resend the related data of the MAC SDU and/or the MAC SDU if the determination result is no.

Optionally, the MAC SDU related data is a MAC SDU to which the MAC SDU fragment belongs.

Optionally, the MAC SDU is directly sent or the MAC SDU is split into multiple MAC SDU segments, and then sent; the MAC SDU segment is directly sent or the MAC SDU to which the MAC SDU segment belongs is retransmitted. Deleting the MAC SDU to which the MAC SDU segment belongs and the failure waiting time of the MAC SDU when the MAC SDU retransmission to which the MAC SDU segment belongs is successful; if the MAC SDU fragment fails to be retransmitted and the determination result is yes, If all the SDU segments of the MAC SDU to which the MAC SDU segment belongs are retransmitted, the MAC SDU to which the MAC SDU segment belongs and the MAC SDU to which the MAC SDU segment belongs are deleted.

The retransmission module is further configured to delete the MAC SDU and the failure waiting time set for the MAC SDU when the retransmission is successful, or if the retransmission fails and the determination result is yes.

FIG. 7 is a structural diagram of another data retransmission apparatus according to an embodiment of the present invention. As shown in FIG. 7, the apparatus includes: receiving module 72 and transmitting, in addition to all the modules shown in FIG. The module 74 is sent.

The receiving module 72 is configured to receive the MAC SDU sent by each logical channel, and set the failure waiting time for the MAC SDU;

The sending module 74 is configured to encapsulate the MAC SDU, obtain a MAC PDU, and send a MAC PDU.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Example 3

A MAC device is also provided in this embodiment. FIG. 8 is a structural diagram of a MAC device according to an embodiment of the present invention. As shown in FIG. 8, the device includes a processor 82 and a retransmission module 84.

The processor 82 is configured to detect, when the MAC SDU retransmission fails, whether the failure waiting time of the MAC SDU is timed out; if the determination result is no, resend the MAC SDU and/or the MAC SDU related data;

The transmission interface 84 is configured to transmit related data of the MAC SDU and/or the MAC SDU.

Example 4

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

Optionally, in this embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a random access memory (RAM, Random). A variety of media that can store program code, such as Access Memory), removable hard disk, disk, or optical disk.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

With the embodiment of the present invention, the related data using the MAC SDU and/or the MAC SDU is retransmitted again within the waiting time after the retransmission fails. Therefore, the problem that the two-layer retransmission mechanism in the related technology may delay the delivery of service data to the application layer in time and affect the service QoS may be solved, thereby accelerating the delivery of data to the application layer and improving the effect of service QoS.

Claims

A data retransmission method includes:

When the media access control service data unit MAC SDU retransmission fails, detecting whether the failure waiting time of the MAC SDU expires;

If the result of the determination is no, the related data of the MAC SDU and/or the MAC SDU is retransmitted.
The method of claim 1 wherein the method further comprises:

Receiving the MAC SDU sent by each logical channel, and setting the failure waiting time for the MAC SDU;

Encapsulating the MAC SDU, obtaining a MAC protocol data unit PDU, and transmitting a MAC PDU.
The method of claim 1, wherein the MAC SDU is encapsulated to obtain a MAC PDU, further comprising:

Encapsulating the MAC SDU, MAC Control element, and Padding into the MAC PDU.
The method of claim 1 wherein the MAC SDU related data is a MAC SDU fragment attributed to the MAC SDU.
The method according to claim 2, wherein the air interface transmission priority of the retransmitted MAC SDU and/or the MAC SDU related data is greater than the MAC SDU in the MAC PDU that is not transmitted.
The method according to claim 2, wherein the retransmitted data of the MAC SDU and/or the MAC SDU is transmitted together with the MAC SDU buffered in the respective logical channels.
The method of claim 4 wherein said MAC SDU is retransmitted And/or related data of the MAC SDU, including:

Transmitting the MAC SDU directly or dividing the MAC SDU into multiple MAC SDU segments and transmitting;

Retransmitting the MAC SDU fragment directly or resending the MAC SDU to which the MAC SDU fragment belongs.
The method of claim 4, comprising:

When the retransmission is successful, or when the retransmission fails and the judgment result is yes, deleting the MAC SDU and the failure waiting time set for the MAC SDU;

Deleting the MAC SDU to which the MAC SDU fragment belongs and the failure waiting time of the MAC SDU when the MAC SDU retransmission is successful.

If the retransmission of the MAC SDU segment fails and the determination result is yes, and all the SDU segments of the MAC SDU to which the MAC SDU segment belongs are retransmitted, the MAC SDU to which the MAC SDU segment belongs and the MAC address are deleted. The expiration wait time of the MAC SDU to which the SDU fragment belongs.
A data retransmission device includes:

a detecting module, configured to detect, when the MAC SDU retransmission fails, whether a failure waiting time of the MAC SDU is timed out;

The retransmission module is configured to resend the related data of the MAC SDU and/or the MAC SDU if the judgment result is no.
The apparatus of claim 9 wherein said apparatus further comprises:

a receiving module, configured to receive the MAC SDU sent by each logical channel, and set the failure waiting time for the MAC SDU;

The sending module is configured to encapsulate the MAC SDU, obtain a MAC PDU, and send a MAC PDU.
The apparatus of claim 9, wherein the MAC SDU related data is a MAC SDU fragment attributed to the MAC SDU.
The apparatus of claim 11, wherein the retransmission module is further configured to

Transmitting the MAC SDU directly or dividing the MAC SDU into multiple MAC SDU segments and transmitting;

Retransmitting the MAC SDU fragment directly or resending the MAC SDU to which the MAC SDU fragment belongs.
The apparatus of claim 11 wherein said retransmission module is further configured to:

When the retransmission is successful, or when the retransmission fails and the judgment result is yes, deleting the MAC SDU and the failure waiting time set for the MAC SDU;

Deleting the MAC SDU to which the MAC SDU fragment belongs and the failure waiting time of the MAC SDU when the MAC SDU retransmission is successful.

If the retransmission of the MAC SDU segment fails and the determination result is yes, and all the SDU segments of the MAC SDU to which the MAC SDU segment belongs are retransmitted, the MAC SDU to which the MAC SDU segment belongs and the MAC address are deleted. The expiration wait time of the MAC SDU to which the SDU fragment belongs.
A MAC device, including:

a processor, configured to detect, when the MAC SDU retransmission fails, whether a failure waiting time of the MAC SDU is timed out; if the determination result is no, resending the MAC SDU and/or the MAC SDU Related data;

And a transmission interface, configured to transmit related data of the MAC SDU and/or the MAC SDU.
A storage medium, characterized in that the storage medium comprises a stored program, wherein the program is executed to perform the method of any one of claims 1 to 8.