WO2019014918A1

WO2019014918A1 - Data transmission method and device

Info

Publication number: WO2019014918A1
Application number: PCT/CN2017/093845
Authority: WO
Inventors: 唐海
Original assignee: Oppo广东移动通信有限公司
Priority date: 2017-07-21
Filing date: 2017-07-21
Publication date: 2019-01-24
Also published as: CN109565377A

Abstract

Disclosed in embodiments of the present application are a data transmission method and device enabling data transmission in a radio link control (RLC) layer. The method comprises: a terminal device receiving a first protocol data unit (PDU), wherein the sequence number (SN) of the first PDU is a first SN, the SN of a PDU in a radio link control (RLC) buffer is a second SN, the PDU in the RLC buffer is a PDU segment of a first service data unit (SDU); if the first PDU and the PDU in the RLC buffer are not continuous, the terminal device starting a first timer, the first timer being corresponding to the first SDU; and receiving other PDU segments belonging to the first SDU before the first timer runs out.

Description

Method and device for transmitting data

Technical field

Embodiments of the present application relate to the field of communications, and, more particularly, to a method and apparatus for transmitting data.

Background technique

In the discussion of the New Radio (NR) system, the following improvements have been made to Radio Link Control (RLC):

1. Determining the service data unit (SDU) function of the segmentation of the RLC layer, that is, one SDU may correspond to one or more protocol data units (PDUs), that is, each PDU may be an SDU. A segment of a different segment carrying the different segments of the same SDU has the same sequence number (SN). Therefore, the SN can know which PDUs belong to the same SDU.

2. It is determined that the RLC layer no longer supports the sequential delivery function of the RLC SDU.

Therefore, how to implement data transmission at the RLC layer is an urgent problem for the terminal device.

Summary of the invention

The embodiment of the present application provides a method and a device for transmitting data, which can implement data transmission of an RLC layer.

In a first aspect, a method of transmitting data is provided, comprising:

The terminal device receives the first protocol data unit PDU, the sequence number SN of the first PDU is the first SN, the SN of the PDU in the radio link control RLC buffer is the second SN, and the PDU in the RLC buffer is the first a segmentation PDU of the service data unit SDU;

If the first PDU is not continuous with the PDU in the RLC cache, the terminal device starts the first timer, and the first timer corresponds to the first SDU;

In the case that the first timer has not timed out, other segment PDUs belonging to the first SDU are received.

Therefore, in the method for transmitting data in the embodiment of the present application, the terminal device may receive the first PDU, and if the PDU in the first PDU and the RLC cache is discontinuous, the RLC is enabled. The timer corresponding to the first SDU to which the PDU in the cache belongs, in the case that the first timer is not timed out, the other segment PDU of the first PDU is received, that is, the method for transmitting data in the embodiment of the present application, The reception of the segmentation PDU for each SDU can be achieved by assigning a timer to each SDU.

In conjunction with the first aspect, in a possible implementation manner of the first aspect, the method further includes:

Determining that the first PDU is not continuous with the PDU in the RLC cache.

With reference to the first aspect, in a possible implementation manner of the first aspect, the determining that the first PDU is discontinuous with the PDU in the RLC cache includes:

If the first SN is equal to the second SN, if there is another unseen PDU belonging to the first SDU between the first PDU and the PDU in the RLC cache, Determining that the first PDU and the PDU in the RLC cache are discontinuous; or

If the first SN is not equal to the second SN, if the terminal device does not receive all the segment PDUs of the first SDU, and the first timer is not activated, the terminal The device determines that the first PDU is not contiguous with the PDU in the RLC cache.

That is, the PDUs in the first PDU and the RLC cache may belong to the same SDU, or may not belong to the same SDU. When the first PDU and the PDU in the RLC cache belong to the same SDU, if there are other segment PDUs of the first SDU that are not received before the first PDU, it is determined that the PDU is currently received. If the first PDU and the PDU in the RLC buffer are not consecutive; or if the first PDU and the PDU in the RLC cache do not belong to the same SDU, if the first PDU is received, The other segment PDUs of the first SDU are not received, and the timer corresponding to the first SDU is not yet enabled, that is, the PDUs in the RLC buffer are continuously received, so the timing corresponding to the first SDU is not started. That is, at least the last segment of the first SDU is not received, in which case the terminal device may consider that the PDU in the first PDU and the RLC cache is discontinuous.

If the first timer does not time out, if the terminal device receives all the segment PDUs of the first SDU, the terminal device stops the first timer.

The terminal device reassembles all the received segment PDUs of the first SDU into the first SDU, and delivers the same to the upper layer.

For example, the terminal device may remove the received segmentation PDU of the first SDU, remove the RLC header, reassemble the first SDU, and deliver it to an upper layer, for example, a PDCP layer.

If the first timer expires, if the terminal device does not receive all the segment PDUs of the first SDU, the terminal device discards the received segment PDUs belonging to the first SDU. .

That is, if the first timer expires, if the terminal device does not receive all the segment PDUs of the first SDU, it may be considered that the received segment PDU cannot be reorganized into a complete The SDU, therefore, the terminal device may discard the segment PDU of the received first SDU, thereby facilitating avoiding the occupation of the RLC cache by the part of the segmentation PDU.

With reference to the first aspect, in a possible implementation manner of the first aspect, the RLC cache includes a second PDU, where the second PDU is a first segment of the first SDU, an intermediate segment or The last segment.

It should be noted that the intermediate segment of the first SDU may include at least one segment, or the first SDU may not include the intermediate segment, which is not limited in this embodiment of the present application.

With reference to the first aspect, in a possible implementation manner of the first aspect, a packet header of the second PDU includes a first indication domain, where the first indicator domain is used to indicate that the second PDU is in the following case One:

A first segment comprising the first SDU, including an intermediate segment of the first SDU or a last segment of the first SUD.

With reference to the first aspect, in a possible implementation manner of the first aspect, if the second PDU is an intermediate segment or a last segment of the first SDU, the packet header of the second PDU further includes And a second indication field, where the second indication field is used to indicate a starting position of the second PDU in the first SDU.

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

In a third aspect, an apparatus for transmitting data is provided, the apparatus comprising: a memory, a processor, an input interface, and an output interface. The memory, the processor, the input interface, and the output interface are connected by a bus system. The memory is for storing instructions for executing the memory stored instructions for performing the method of any of the first aspect or the first aspect of the first aspect.

In a fourth aspect, a computer storage medium is provided for storing computer software instructions for performing the method of any of the above first aspect or any of the possible implementations of the first aspect, comprising program.

In a fifth aspect, a computer program product comprising instructions, when executed on a computer, causes the computer to perform the method of any of the first aspect or the optional implementation of the first aspect.

DRAWINGS

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

FIG. 2 is a schematic flowchart of a method for transmitting data according to an embodiment of the present application.

FIG. 3 shows a schematic diagram of an example of determining that a newly received PDU and a PDU in the RLC buffer are discontinuous.

FIG. 4 shows a schematic diagram of another example of determining that a newly received PDU and a PDU in the RLC cache are discontinuous.

FIG. 5 is a schematic block diagram of an apparatus for transmitting data according to an embodiment of the present application.

FIG. 6 shows a schematic block diagram of an apparatus for transmitting data according to another embodiment of the present application.

Detailed ways

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

The technical solution of the embodiment of the present application can be applied to various communication systems, for example, Global System of Mobile communication ("GSM") system, Code Division Multiple Access (CDMA). System, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service ("GPRS"), Long Term Evolution (Long Term Evolution, referred to as "Long Term Evolution" LTE") system, LTE Frequency Division Duplex ("FDD") system, LTE Time Division Duplex ("TDD"), Universal Mobile Telecommunication System (Universal Mobile Telecommunication System) It is a "UMTS"), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, or a future 5G system.

FIG. 1 shows a wireless communication system 100 to which an embodiment of the present application is applied. The wireless communication system 100 can include a network device 110. Network device 100 can be a device that communicates with a terminal device. The internet Device 100 may provide communication coverage for a particular geographic area and may communicate with terminal devices (e.g., UEs) located within the coverage area. Optionally, the network device 100 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or may be a base station (NodeB, NB) in a WCDMA system, or may be an evolved base station in an LTE system. (Evolutional Node B, eNB or eNodeB), or a wireless controller in a Cloud Radio Access Network (CRAN), or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, A network side device in a future 5G network or a network device in a publicly available Public Land Mobile Network (PLMN) in the future.

The wireless communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110. Terminal device 120 can be mobile or fixed. Optionally, the terminal device 120 may refer to an access terminal, a user equipment (User Equipment, UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, and a wireless communication. Device, user agent, or user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or terminal devices in future evolved PLMNs, and the like.

Optionally, in the embodiment of the present application, the 5G system or network may also be referred to as an NR system or a network.

In the following, a brief introduction to the background knowledge related to the embodiments of the present application will be given.

The Radio Link Control (RLC) layer is located between a Packet Data Convergence Protocol (PDCP) layer and a Media Access Control (MAC) layer. The RLC layer communicates with the PDCP layer through a Service Access Point (SAP) and communicates with the MAC layer through a logical channel. There is one RLC entity per logical channel per UE. The data received by the RLC entity from the PDCP layer, or the data sent to the PDCP layer is referred to as an RLC SDU or PDCP PDU. The data received by the RLC entity from the MAC layer, or the data sent to the MAC layer is referred to as an RLC PDU or a MAC SDU.

In the prior art, the RLC PDUs received by the RLC entity of the terminal device in the reordering window are out of order, need to be reordered, and then submitted to the PDCP layer, and the RLC PDUs arrive out of order. It will be saved in the receive buffer until the previous RLC PDU has been successfully received and delivered to the PDCP layer.

As can be seen from the foregoing description, in the NR system, the RLC layer can support the SDU function, but the RLC SDU does not support the sequential delivery function. Therefore, a method for transmitting data is needed, which can implement data delivery from the RLC layer to the upper layer. .

2 is a schematic flowchart of a method 200 for transmitting data according to an embodiment of the present application. The method 200 may be performed by a terminal device in the wireless communication system shown in FIG. 1. As shown in FIG. 2, the method 200 includes :

S210, the terminal device receives the first protocol data unit PDU, the sequence number SN of the first PDU is the first SN, the SN of the PDU in the radio link control RLC buffer is the second SN, and the PDU in the RLC buffer is A segmentation PDU of the first service data unit SDU.

Optionally, in the embodiment of the present application, the RLC layer may be an Unacknowledged Mode (UM) mode or an Acknowledged Mode (AM) mode. In the UM mode, the RLC receiver does not perform the received RLC PDU. The feedback confirms that in the AM mode, the RLC receiver will perform feedback confirmation on the received RLC PDU.

In the UM mode, the RLC PDU received by the terminal device may also be referred to as a UMD PDU, or in the AM mode, the RLC PDU received by the terminal device may be referred to as an AMD PDU, and the MAC address received by the terminal device is not differentiated in this embodiment. The data transmitted by the layer is collectively referred to as a PDU.

At a certain moment, the terminal device receives the first PDU, and the sequence number (SN) of the first PDU is the first SN. At this time, the RLC cache includes at least one PDU, and the at least one PDU. The sequence number is a second SN, and the at least one PDU is a segment PDU of the first SDU, that is, the first SDU can be divided into multiple segments, and each segment can be formed into a PDU by adding an RLC packet header, that is, It is said that one SDU can be divided into multiple segment PDU transmissions, each segment PDU having the same SN.

Optionally, in the embodiment of the present application, the RLC cache includes a second PDU, where the second PDU is a first segment, an intermediate segment, or a last segment of the first SDU.

Optionally, in the embodiment of the present application, the packet header of the second PDU includes a first indication domain, where the first indication domain is used to indicate that the second PDU is one of the following conditions:

Including a first segment of the first SDU, including an intermediate segment or packet of the first SDU The last segment of the first SUD is included.

For example, the first indication field may be 2 bits, and is represented by a segment index SI. For example, it may be set that when the SI=01, the second SDU is the first segment of the first SDU, when the SI =10 indicates that the second SDU is an intermediate segment of the first SDU, and when SI=11, the second SDU is the last segment of the first SDU.

Optionally, if the second PDU is an intermediate segment or a last segment of the first SDU, the packet header of the second PDU further includes a second indication domain, where the second indication domain is used to indicate Determining a starting position of the second PDU in the first SDU.

For example, the second indication field may be represented by a segment offset SO, and the SO is used to indicate a starting position of the second PDU in the first SDU, or the start of the second PDU. The offset of the position relative to the starting position of the first SDU.

S220. If the first PDU is not continuous with the PDU in the RLC cache, the terminal device starts a first timer, where the first timer corresponds to the first SDU.

S230. Receive other segment PDUs belonging to the first SDU if the first timer does not time out.

The discontinuity of the at least one PDU in the first PDU and the RLC cache may be understood as a segment PDU of the first SDU that is not received before the first PDU, and therefore, the foregoing may be started. A first timer corresponding to an SDU receives another segment PDU of the first SDU.

Optionally, the method 200 further includes:

Determining that the first PDU is not continuous with the PDU in the RLC cache.

That is, the terminal device first determines that the first PDU is discontinuous with the PDU in the RLC cache, that is, determines that the first PDU has a fragment PDU of the first SDU that is not received before, and then opens the first PDU. A first timer corresponding to an SDU receives another segment PDU of the first SDU if the first timer does not time out.

Optionally, in some embodiments, the determining that the first PDU is discontinuous with the PDU in the RLC cache includes:

Specifically, in a case where the first SN is equal to the second SN, that is, at least one PDU in the first PDU and the RLC cache belongs to the same SDU, and therefore, has the same SN. Between the first PDU and at least one of the RLC caches, there are other segment PDUs of the first SDU that are not received, then the terminal device may determine the first PDU and the RLC cache. The PDUs in the PDU are not continuous.

Or, in a case that the first SN is not equal to the second SN, that is, at least one of the first PDU and the RLC cache does not belong to the same SDU, in this case, if the terminal device does not receive Going to all the segment PDUs of the first SDU, and the first timer corresponding to the first SDU is not activated, that is, at least one PDU in the RLC buffer is continuously received, so the triggering is not triggered. The first timer, but at this time, the segment PDUs of other SDUs are received after all the segment PDUs of the first SDU have not been received. That is, at least one PDU in the RLC cache includes a first segment of the first SDU, or a first segment of the first SDU and at least one intermediate segment, in other words, not received The segmentation PDU may include the last segment of the first SDU, or the last segment of the first SDU and at least one intermediate segment, ie, the unreceived segment PDU includes at least the last segment.

Hereinafter, in conjunction with the specific examples shown in FIG. 3 and FIG. 4, how the terminal device determines the latest received PDU and the PDU discontinuity in the RLC buffer is described in detail.

As shown in FIG. 3, at a certain moment, the terminal device receives the PDU3, wherein the SN of the PDU3 is 1, SI=11, and SO=500, that is, the PDU3 is a SDU of the SN=1 (denoted as SDU1). Segment PDU, and the PDU3 is an intermediate segment of SDU1, and the offset of PDU3 in the SDU1 is 500 bytes, or there is a 500-byte PDU in SDU1 before PDU3.

At this time, there are PDU1 and PDU2 in the RLC buffer, both PDU1 and PDU2 are segment PDUs of SDU1, and PDU1 is the first segment of SDU1, PDU2 is the intermediate segment of SDU1, and PDU1 and PDU2 are Continuously, if both PDU1 and PDU2 are 100 bytes in length, the terminal device may determine that a 300-byte PDU is not received between PDU2 and PDU3. At this time, the terminal device may be turned on. The timer corresponding to the SDU1 receives the segmentation PDU between the PDU2 and the PDU3.

As shown in FIG. 4, at some time, the terminal device receives the PDU 5, where the SN of the PDU 5 2, SI=01, that is, the PDU5 is a segmentation PDU of an SDU (denoted as SDU2) of SN=2, and the PDU5 is the first segment of the SDU2.

At this time, there are PDU1, PDU2 and PDU4 in the RLC buffer, PDU1, PDU2 and PDU4 are all segmentation PDUs of SDU1, and PDU1 is the first segment of SDU1, and PDU2 and PDU4 are intermediate segments of the SDU1, PDU1, PDU2, and PDU4 are contiguous. Therefore, the timer corresponding to SDU1 is not started, but the terminal device has not received the last segment of SDU1, that is, the segment PDU of SDU1 has not been received yet. To the new SDU, that is, the segmentation PDU of the SDU2, the terminal device may start a timer corresponding to the SDU1, and receive other segmentation PDUs of the SDU1 that have not been received, that is, receive the segmentation PDU after the PDU4.

Optionally, in the embodiment of the present application, the method 200 further includes:

Further, the method 200 may further include:

That is, the terminal device may remove the received fragmentation PDU of the first SDU, remove the RLC header, reassemble the first SDU, and deliver it to an upper layer, for example, a PDCP layer.

Optionally, as another embodiment, the method 200 further includes:

If the first timer expires, if the terminal device does not receive all the segment PDUs of the first SDU, it may be considered that the received segment PDU cannot be reassembled into a complete SDU. Therefore, The terminal device may discard the segment PDU of the first SDU that has been received, thereby facilitating avoiding the occupation of the RLC cache by the part of the segmentation PDU.

Further, the terminal device may reset the first timer, that is, set the duration of the first timer to a specific value, but does not start the first timer, so that the next time the first timer needs to be received The first timer is started when another segment PDU of an SDU is used.

It should be noted that, in the embodiment of the present application, each SDU corresponds to a timer, or the same PDU of the SN corresponds to a timer, and the timer is used to receive the segment PDU of the corresponding SDU, and each SDU corresponds to The duration of the timers can be the same or different.

Optionally, when a timer corresponding to an SDU is reset, the timer may also be used to receive segment PDUs of other SDUs, but at the same time, one timer can only be used to receive one SDU. Segment PDU.

Therefore, in the method for transmitting data in the embodiment of the present application, the terminal device may receive the first PDU, and in the case that the PDU in the first PDU and the RLC cache is discontinuous, the first PDU to which the PDU in the RLC buffer belongs is enabled. The timer corresponding to the SDU, in the case that the first timer is not timed out, receives the other segment PDUs of the first PDU, that is, the method for transmitting data in the embodiment of the present application, by assigning one to each SDU. A timer, thereby enabling reception of a segmentation PDU for each SDU.

The embodiment of the method of the present application is described in detail below with reference to FIG. 2 to FIG. 4 . The device embodiment of the present application is described in detail below with reference to FIG. 5 to FIG. 6 . It should be understood that the device embodiment and the method embodiment correspond to each other. The description of the method can be referred to the method embodiment.

FIG. 5 is a schematic block diagram of an apparatus for transmitting data according to an embodiment of the present application. The device 500 of Figure 5 includes:

The communication module 510 is configured to receive the first protocol data unit PDU, where the sequence number SN of the first PDU is the first SN, and the SN of the PDU in the radio link control RLC buffer is the second SN, where the RLC cache The PDU is a segmentation PDU of the first service data unit SDU;

The processing module 520 is configured to: when the first PDU and the PDU in the RLC cache are not consecutive, start a first timer, where the first timer corresponds to the first SDU;

The communication module 510 is further configured to receive other segment PDUs belonging to the first SDU if the first timer does not time out.

Optionally, in some embodiments, the device 500 further includes:

And a determining module, configured to determine that the first PDU is discontinuous with a PDU in an RLC cache.

Optionally, in some embodiments, the determining module is specifically configured to:

If the first SN is equal to the second SN, if there is another unseen segment PDU belonging to the first SDU between the first PDU and the PDU in the RLC cache, determining The first PDU and the PDU in the RLC cache are discontinuous; or

If the first SN is not equal to the second SN, if the device does not receive all the segment PDUs of the first SDU, and the first timer is not activated, determining the first A PDU is not contiguous with a PDU in the RLC cache.

Optionally, in some embodiments, the processing module 520 is further configured to:

If the first timer does not time out, if the device receives all the segment PDUs of the first SDU, the first timer is stopped.

All received segment PDUs of the first SDU are reassembled into the first SDU and submitted to the upper layer.

If the first timer expires, if the device does not receive all the segment PDUs of the first SDU, discard the received segment PDUs belonging to the first SDU.

Optionally, in some embodiments, the RLC cache includes a second PDU, where the second PDU is a first segment, an intermediate segment or a last segment of the first SDU.

Optionally, in some embodiments, the packet header of the second PDU includes a first indication domain, where the first indication domain is used to indicate that the second PDU is one of:

Optionally, in some embodiments, if the second PDU is an intermediate segment or a last segment of the first SDU, the packet header of the second PDU further includes a second indication field, where the second The indication field is used to indicate a starting position of the second PDU in the first SDU.

Specifically, the device 500 may correspond to (for example, may be configured or be itself) the terminal device described in the foregoing method 200, and each module or unit in the device 500 is used to execute the terminal device in the foregoing method 200, respectively. Each of the operations or processes performed is omitted here for the sake of avoiding redundancy.

As shown in FIG. 6, the embodiment of the present application further provides a device 600 for transmitting data, which may be the device 500 in FIG. 5, which can be used to execute a terminal device corresponding to the method 200 in FIG. content. The device 600 includes an input interface 610, an output interface 620, a processor 630, and a memory 640. The input interface 610, the output interface 620, the processor 630, and the memory 640 can be connected by a bus system. The memory 640 is used to store programs, instructions or code. The processor 630 is configured to execute a program, an instruction or a code in the memory 640 to control the input interface 610 to receive a signal, control the output interface 620 to send a signal, and complete the operations in the foregoing method embodiments.

It should be understood that, in the embodiment of the present application, the processor 630 may be a central processing unit ("CPU"), and the processor 630 may also be other General purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 640 can include read only memory and random access memory and provides instructions and data to the processor 630. A portion of the memory 640 can also include a non-volatile random access memory. For example, the memory 640 can also store information of the device type.

In the implementation process, each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 630 or an instruction in a form of software. The content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 640, and the processor 630 reads the information in the memory 640 and completes the contents of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

In a specific implementation, the processing module 520 and the determining module included in the device 500 of FIG. 5 can be implemented by the processor 630 of FIG. 6. The communication module 510 included in the device 500 of FIG. 5 can use the input interface 610 of FIG. And the output interface 620 is implemented.

The embodiment of the present application further provides a computer readable storage medium storing one or more programs, the one or more programs including instructions, when the portable electronic device is included in a plurality of applications When executed, the portable electronic device can be caused to perform the method of the embodiment shown in FIG. 2.

The embodiment of the present application also proposes a computer program comprising instructions which, when executed by a computer, cause the computer to execute the corresponding flow of the method of the embodiment shown in FIG. 2.

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

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working processes of the above described systems, devices and units can refer to the corresponding solutions in the foregoing method embodiments. The process will not be repeated here.

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

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

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

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

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

Claims

A method for transmitting data, comprising:

The terminal device receives the first protocol data unit PDU, the sequence number SN of the first PDU is the first SN, the SN of the PDU in the radio link control RLC buffer is the second SN, and the PDU in the RLC buffer is the first a segmentation PDU of the service data unit SDU;

If the first PDU is not continuous with the PDU in the RLC cache, the terminal device starts the first timer, and the first timer corresponds to the first SDU;

In the case that the first timer has not timed out, other segment PDUs belonging to the first SDU are received.
The method of claim 1 further comprising:

Determining that the first PDU is not continuous with the PDU in the RLC cache.
The method according to claim 2, wherein the determining that the first PDU is not continuous with the PDU in the RLC cache comprises:

If the first SN is equal to the second SN, if there is another unseen PDU belonging to the first SDU between the first PDU and the PDU in the RLC cache, Determining that the first PDU and the PDU in the RLC cache are discontinuous; or

If the first SN is not equal to the second SN, if the terminal device does not receive all the segment PDUs of the first SDU, and the first timer is not activated, the terminal The device determines that the first PDU is not contiguous with the PDU in the RLC cache.
The method according to any one of claims 1 to 3, further comprising:

If the first timer does not time out, if the terminal device receives all the segment PDUs of the first SDU, the terminal device stops the first timer.
The method of claim 4, wherein the method further comprises:

The terminal device reassembles all the received segment PDUs of the first SDU into the first SDU, and delivers the same to the upper layer.
The method according to any one of claims 1 to 5, wherein the method further comprises:

If the first timer expires, if the terminal device does not receive all the segment PDUs of the first SDU, the terminal device discards the received information belonging to the first SDU. Segment PDU.
The method according to any one of claims 1 to 6, wherein the RLC cache includes a second PDU, the second PDU is a first segment of the first SDU, and an intermediate segment Or the last segment.
The method according to claim 7, wherein the header of the second PDU comprises a first indication field, and the first indication field is used to indicate that the second PDU is one of:

A first segment comprising the first SDU, including an intermediate segment of the first SDU or a last segment of the first SUD.
The method according to claim 8, wherein if the second PDU is an intermediate segment or a last segment of the first SDU, the header of the second PDU further includes a second indication domain, The second indication field is used to indicate a starting position of the second PDU in the first SDU.
A device for transmitting data, comprising:

a communication module, configured to receive a first protocol data unit PDU, where the sequence number SN of the first PDU is a first SN, and the SN of the PDU in the radio link control RLC buffer is a second SN, and the PDU in the RLC buffer a segmentation PDU that is a first service data unit SDU;

a processing module, configured to: when the PDU of the first PDU and the RLC cache is discontinuous, start a first timer, where the first timer corresponds to the first SDU;

The communication module is further configured to receive other segment PDUs belonging to the first SDU if the first timer does not time out.
The device according to claim 10, wherein the device further comprises:

And a determining module, configured to determine that the first PDU is discontinuous with a PDU in an RLC cache.
The device according to claim 11, wherein the determining module is specifically configured to:

If the first SN is equal to the second SN, if there is another unseen segment PDU belonging to the first SDU between the first PDU and the PDU in the RLC cache, determining The first PDU and the PDU in the RLC cache are discontinuous; or

If the first SN is not equal to the second SN, if the device does not receive all the segment PDUs of the first SDU, and the first timer is not activated, determining the first A PDU is not contiguous with a PDU in the RLC cache.
The device according to any one of claims 10 to 12, wherein the processing module is further configured to:

If the first timer does not time out, if the device receives all the segment PDUs of the first SDU, the first timer is stopped.
The device according to claim 13, wherein the processing module is further configured to:

All received segment PDUs of the first SDU are reassembled into the first SDU and submitted to the upper layer.
The device according to any one of claims 10 to 14, wherein the processing module is further configured to:

If the first timer expires, if the device does not receive all the segment PDUs of the first SDU, discard the received segment PDUs belonging to the first SDU.
The device according to any one of claims 10 to 15, wherein the RLC cache includes a second PDU, the second PDU is a first segment of the first SDU, and an intermediate segment Or the last segment.
The device according to claim 16, wherein the header of the second PDU comprises a first indication field, and the first indication field is used to indicate that the second PDU is one of:

A first segment comprising the first SDU, including an intermediate segment of the first SDU or a last segment of the first SUD.
The device according to claim 17, wherein if the second PDU is an intermediate segment or a last segment of the first SDU, the packet header of the second PDU further includes a second indication domain, where The second indication field is used to indicate a starting position of the second PDU in the first SDU.