WO2022100733A1

WO2022100733A1 - Data sensing method and related device thereof

Info

Publication number: WO2022100733A1
Application number: PCT/CN2021/130648
Authority: WO
Inventors: 施玲玲
Original assignee: 华为技术有限公司
Priority date: 2020-11-13
Filing date: 2021-11-15
Publication date: 2022-05-19
Also published as: CN114499749A

Abstract

Disclosed in embodiments of the present application are a data sending method and a related device, which are used in the technical field of communications. The method comprises: a packet data convergence protocol (PDCP) layer of a sending end determines, according to the length of a receiving window corresponding to a receiving end, the number N of first data packets among data packets to be sent, wherein a sequence of the data packets to be sent comprises M data packets to be sent, M is greater than the length of the receiving window, and N is less than the length of the receiving window; the sending end numbers sequence numbers (SNs) of the first data packets; the sending end determines the remaining data packets to be sent as second data packets, wherein the second data packets do not carry SNs; the sending end sends the first data packets and the second packets to a target end in sequence, so that the target end forwards the first data packets and the second data packets to the receiving end.

Description

A data transmission method and related equipment

This application claims the priority of the Chinese patent application filed on November 13, 2020 with the application number 202011270069.8 and the invention titled "A data transmission method and related equipment", the entire contents of which are incorporated herein by reference Applying.

technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a data sending method and related devices.

Background technique

In the long term evolution (LTE) system, the packet data convergence protocol (PDCP) layer can assign a 32-bit digital number (count) to the data for integrity protection and encryption and decryption; wherein , count is composed of a high-order overclocking number (hyper frame number, HFN) and a low-order sequence number (sequence number, SN); among them, the length of SN is fixed and configured by the upper layer, which can occupy 5 bits, 12 bits or 16 bits.

In the process of mutual communication between the sending end and the receiving end, the sending end and the receiving end save the HFN respectively, and then the sending end numbers the data packets in sequence, determines the SN corresponding to each data packet, and then uses the HFN and each data packet stored by itself. The SN corresponding to the data packet constitutes the count value corresponding to each data packet. Finally, the data packet is encrypted according to the corresponding count value and other parameters of each data packet and sent to the receiver, that is, the SN will be sent to the receiver during the data transmission process. Continuously increasing by 1; when the SN reaches the maximum value, the sender will reverse, so that the HEV saved by itself is increased by 1, and then the subsequent data packets are numbered from the initial state.

Since the data packet sent by the sender only carries the SN, but not the HFN, the receiver updates the HFN stored by itself according to the SN number carried in the data packet. Specifically, the receiver will use the SN of the received data packet as the The lower limit value of its receiving window, and then the lower limit value updates the receiving window, and receives data packets according to the receiving window. When the lower limit value of the receiving window flips, it adds 1 to the HFN saved by itself, and then saves it according to itself. HFN and SN of the data packet, decrypt the received data packet.

In the case of switching data or poor channel quality, a large number of packet loss will occur, which will cause the data packets received by the receiver to fail to fall into the receiving window, and the receiving window cannot be updated. The HFN and the sender HFN cannot be updated synchronously, so that the sender cannot correctly decrypt the subsequently received data packets, and the traffic is interrupted and cannot be recovered.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a data sending method and related equipment, which are used by the PDCP layer to number and send the SN number of the data packet to be sent, so as to avoid traffic interruption due to different superframe numbers HFN stored at the sending end and the receiving end situation occurs.

A first aspect of the embodiments of the present application provides a data transmission method, the method comprising:

When the sender and the receiver perform data transmission, if the number of packets to be sent by the sender exceeds the length of the receive window on the receiver side, the PDCP layer of the sender can first determine the length of the receive window on the receiver side to determine the number of packets to be sent. Send the number of first data packets that need to carry the SN number in the data packet, and then sequentially number the SN of the first data packet; The target end sends the first data packet and the second data packet, and then the target end forwards the received data packet to the receiving end.

In the scenario of traffic switching, a large number of packet loss often occurs between the sender and the destination (forwarding side). If the number of lost packets exceeds the length of the receiving window of the receiving end, the receiving window will no longer slide and cannot be maintained normally. HFN will eventually cause the HFN asynchronous situation between the sender and the receiver. In this way, the receiver cannot decrypt the received data packets normally. In this implementation, when the sender sends a data packet to the target, it is guaranteed that the data packets are in the sequence. The number of first data packets with SN does not exceed the length of the receiving window of the receiving end. In this way, even if all the first data packets carrying SN are lost during transmission, some data packets will fall into the receiving window, and the receiving window will It will slide normally, and the receiving end will maintain the HFN normally, so as to avoid the misalignment of the HFNs maintained by the receiving end and the transmitting end.

In an optional implementation manner, when the sender sends the first data packet and the second data packet to the target end in turn, it also needs to send its own number to the target end, that is, send indication information to the target end, telling the target end The starting point of the numbering; in this way, the target end can continue to number the received second data packet without SN according to the starting point, that is, the data packet finally received by the receiving end will carry the SN, and the receiving end will carry the SN according to the data packet. SN to maintain its own stored HFN.

In this embodiment, the sending end indicates the starting point of the SN number of the target end, and the target end can sequentially number the successfully received second data packets according to the starting point. In this way, even if a large amount of packet loss occurs between the sending end and the target end, However, the destination will still number the received data packets without SN from the starting point, thus ensuring that the SN of the data packets forwarded to the receiving end can always fall into the receiving window, ensuring the normal sliding of the receiving window and Ensure the normal update of the receiving end HFN.

In an optional implementation manner, when the data packet that the sender has sent exceeds an SN length, the sender will add 1 to the stored superframe number HFN, and then start from the initial state and re-process the data packet for the second time. The SN number of the round; it is understandable that in the second round of numbering, it is also necessary to ensure that the number of data packets carrying the SN does not exceed the length of the receiving window.

In an optional implementation manner, the reason why the HFNs maintained by the sender and the receiver are out of sync is due to a large amount of packet loss during data transmission between the sender and the target. Therefore, the sender can Count the number of all data packets that it has sent, and the target end counts the number of data packets that it has successfully received, and then compares them to estimate the number of lost packets. If the number of lost packets exceeds the length of the receiving window, then It can be determined that the packet is abnormal, and then it can be processed according to the abnormal phenomenon of the packet, including retransmitting the data packet, or releasing the link resources for re-access.

Therefore, the sender can determine the total number of data packets that have been sent, and then send the total number of sent data packets to the target end for the target end to judge the packet loss situation.

In an optional implementation manner, the sender can also judge the packet loss situation; that is, the target sends feedback information to the sender, and the feedback is used to report the total number of packets successfully received by the target; Then the sender counts the number of all data packets it has sent, compares the two to get the number of lost packets, and finally judges whether the number of lost packets reaches the preset threshold, if it reaches the preset threshold, such as the number of lost packets reaches the receiving window The length of the packet is determined by P, and the sender can make the final processing according to the abnormal phenomenon of the packet.

A second aspect of the embodiments of the present application provides another data transmission method, which includes:

The target end receives the data packet sent by the sending end, and then forwards the sending packet to the receiving end; first, the data packet sent by the sending end to the target end includes the first data packet that carries the SN and the second data packet that does not carry the SN, After receiving the second data packet without the SN, the target end needs to continue to number the SN of the second data packet following the SN number of the first data packet, and then forward the first data packet and the number to the receiving end in turn according to the SN. after the second packet.

In this embodiment, the target end sequentially numbers the successfully received second data packets. In this way, even if a large amount of packet loss occurs between the sender and the target end, the target end will still recognize the received packets that do not carry the SN. Start numbering of the data packets, so as to ensure that the SN of the data packets forwarded to the receiving end can always fall into the receiving window, ensure the normal sliding of the receiving window and ensure the normal update of the receiving end HFN, and prevent the receiving end and the sending end from maintaining their own The phenomenon of HFN misalignment occurs.

Therefore, the target end needs to receive the total number of data packets sent by the sender end, and then the target end determines the total number of data packets that it has successfully received; and finally estimates the number of lost packets to determine the packet loss situation.

A third aspect of the present application provides a sending device, the sending device comprising:

a determining unit, configured to determine the number N of the first data packets in the data packets to be sent according to the length of the receiving window corresponding to the receiving end; wherein, the generation sending data packet sequence includes M generation sending packets, the M is greater than the length of the receiving window, and the N is less than the length of the receiving window;

a processing unit, configured to number the sequence number SN of the first data packet;

The determining unit is further configured to determine that the remaining generation sending data packet is the second data packet; the second data packet does not carry the SN;

A sending unit, configured to sequentially send the first data packet and the second data packet to the target end, so that the target end forwards the first data packet and the second data packet to the receiving end.

In an optional implementation manner, the sending unit is further configured to send indication information to the target end; the indication information includes an upper limit value of the number of the transmitting end; the indication information is used to indicate the target end The end numbers the SN of the received second data packet.

In an optional implementation manner, the processing unit is further configured to update the stored superframe number HFN when the number of sent data packets exceeds the SN length;

The determining unit is also used to redetermine the number N of the first data packet in the transmission data packet from the initial state;

The processing unit is further configured to number the SN of the first data packet in the on behalf of the transmission data packet.

In an optional implementation manner, the determining unit is further configured to determine the total number of sent data packets, and send the total number of sent data packets to the target end.

In an optional implementation manner, the sending device further includes a receiving unit;

The receiving unit is configured to receive feedback information sent by the target terminal, where the feedback information includes the total number of data packets successfully received by the target terminal;

The determining unit is further configured to determine whether the number of lost packets reaches a preset threshold according to the feedback information; if it reaches the preset threshold, determine that the PDCP layer determines that the packet transmission is abnormal.

A fourth aspect of the present application provides a forwarding device, the forwarding device comprising:

a receiving unit, configured to receive the first data packet and the second data packet sent by the sending end; wherein, the first data packet carries the sequence number SN, the second data packet does not carry the SN, and the first data packet The number N is less than the length of the receiving window corresponding to the receiving end;

a processing unit, configured to number the SN of the second data packet;

A sending unit, configured to send the first data packet and the numbered second data packet to the receiving end in sequence.

In an optional implementation manner, the receiving unit is further configured to receive indication information sent by the transmitting end; the indication information includes the upper limit of the number of the transmitting end;

The processing unit is specifically configured to sequentially number the SN number of the second data packet according to the upper limit value of the number.

In an optional implementation manner, the forwarding device further includes a determining unit;

The receiving unit is further configured to receive the total number of sent data packets sent by the sending end;

The determining unit is used to determine the total number of data packets that have been successfully received by oneself; according to the total number of the data packets that have been sent and the total number of data packets that have been successfully received by itself, determine the packet loss situation;

The sending unit is further configured to send feedback information to the sending end, where the feedback information is used to report the packet loss situation to the sending end.

The determining unit is used to determine the total number of data packets successfully received by itself;

The sending unit is further configured to send the total number of data packets successfully received by itself to the sending end.

A fifth aspect of the present application provides a sending device, comprising: at least one processor and a memory, where the memory stores computer-executable instructions that can be executed on the processor, and when the computer-executable instructions are executed by the processor, the The sending device executes the method described in the first aspect or any possible implementation manner of the first aspect.

A sixth aspect of the present application provides a forwarding device, comprising: at least one processor and a memory, where the memory stores computer-executable instructions executable on the processor, and when the computer-executable instructions are executed by the processor, the The forwarding device executes the method described in the second aspect or any possible implementation manner of the second aspect.

A seventh aspect of the present application provides a chip or a chip system, the chip or chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected through a line, and the at least one processor is used for running a computer program or instruction, A data transmission method described in any one of the possible implementation manners of the first aspect to the first aspect;

Wherein, the communication interface in the chip may be an input/output interface, a pin, a circuit, or the like.

In a possible implementation, the chip or chip system described above in this application further includes at least one memory, where instructions are stored in the at least one memory. The memory may be a storage unit inside the chip, such as a register, a cache, etc., or a storage unit of the chip (eg, a read-only memory, a random access memory, etc.).

An eighth aspect of the present application provides a chip or a chip system, the chip or chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is used for running a computer program or instruction, A data transmission method described in any one of the possible implementation manners of the second aspect to the second aspect;

A ninth aspect of the embodiments of the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, which enables the computer to execute the above-mentioned first to second aspects when driving on the computer any one of the data transmission methods described.

As can be seen from the above technical solutions, the embodiments of the present application have the following advantages:

When the transmitting end and the receiving end perform data transmission, the PDCP layer of the transmitting end first determines the number of the first data packets that need to carry the SN number in the data packets to be sent according to the length of the receiving window on the receiving end, and then sequentially analyzes the first data packets. The SN of the packet is numbered; then the remaining data packets are determined as the second data packet without SN, and finally the first data packet and the second data packet are sent to the target end in turn, and then the target end will receive the data packet. Forwarded to the receiving end; since the sending end sends a data packet to the target end, it is ensured that the number of first data packets with SN in the data packet sequence does not exceed the length of the receiving end's receiving window, so even if the first data packet carrying SN is in the transmission process. If all packets are lost in the middle, some data packets will also fall into the receiving window, the receiving window will slide normally, and the receiving end will maintain the HFN normally, so as to avoid the phenomenon that the HFN maintained by the receiving end and the transmitting end are not aligned.

Description of drawings

1 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a sending device according to an embodiment of the present application;

3 is a schematic structural diagram of a forwarding device according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another sending device provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another forwarding device according to an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described in detail below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

A long term evolution (Long Term Evolution, LTE) wireless communication system is a high-speed wireless communication system established on the third generation mobile communication system. In the LTE air interface user plane protocol stack, there are PDCP protocol layer, radio link control (RLC) layer, medium access control (MAC) layer and physical layer in sequence from top to bottom; , each layer completes different data processing, the PDCP layer mainly performs security operations and header compression and decompression processing, such as encryption and integrity protection, etc.; the RLC layer mainly completes data segment concatenation, sequential delivery and automatic retransmission Request (automatic repeat request, ARQ) data transmission guarantee, etc.; MAC layer mainly completes scheduling and cascade processing between different logical channels and hybrid automatic repeat request (HARQ) operation, etc.; Finally, the physical layer completes Transport block contracting and over-the-air transmission.

In the process of data transmission, the PDCP layer of the transmitting end (base station) interacts with the RLC layer of the lower layer; the PDCP layer first manages the sequence number (SN) of the service data units (SDU) received from the upper layer, and then executes the Header compression, integrity protection and encryption, update state variables, generate a protocol data unit (PDU), and finally send the PDU to the RLC layer; after the RLC layer receives the PDU, it sends it in sequence according to the sequence number carried by the PDU , and finally sent to the receiving end (terminal); and in the response mode, the RLC layer will return a confirmation message to the PDCP layer that the PDCP PDU is successfully sent; the PDCP layer will clear the PDCP PDU from the transmission buffer after receiving the confirmation message.

The PDCP layer will assign a 32-bit digital number count to each data packet (PDU), where count is composed of high-order HFN and low-order SN; the length of SN is configured by the upper layer, which can be 5bit, 7bit or 12bit, etc., there is no specific limitation. Before sending the data packet, the PDCP layer will configure the corresponding SN for the data packets in the buffer sequence in turn. Exemplarily, the numbering can start from 0 to determine the SN corresponding to each data packet; The high-order HFN is uniformly maintained by the sender. For example, it is determined that the HFNs of multiple data packets to be forwarded are all 1; in this way, each data packet can be composed of HFN and its corresponding SN. The count corresponding to each data packet is used to encrypt the data packet and transmit it to the receiving end.

It can be understood that the length of the SN will limit the upper limit of the number. For example, if the length of the SN configured by the upper layer is 12 bits, then the space size of the SN is 2 ¹² =4096, that is, the PDCP layer can be up to 4096 SN numbers of data packets Configure, that is, determine that the SN number corresponding to the first data packet is 0, until the SN number of the 4096th data packet is 4097; when the PDCP layer has more than 4096 data packets to be sent, it is necessary to maintain the HFN of the sender. To update, for example, HFN+1 can be added, and then starting from 0, the 4097th data packet and subsequent data packets can be renumbered; that is, in the process of continuously sending data packets, the SN continues to increase by 1, When the SN corresponding to a successfully sent data packet reaches the maximum value, the HFN corresponding to the sender will increase by 1, and the SN corresponding to the subsequent data packets to be sent will be reversed. In this way, the count value of each data packet sent by the sender is different.

The data packet sent by the sender to the receiver will only carry the SN corresponding to the data packet, but not the current HFN of the sender. Generally, the sender and the receiver maintain their corresponding HFN respectively; the receiver corresponds to There is a receiving window, which only receives data packets whose SN falls into the receiving window. Specifically, the length of the receiving window is generally the size of the SN space. Exemplarily, in the above example, the SN length configured by the upper layer is 12 bits. Then the space size of SN is 2 ¹² = 4096, then the receiving window is half of its size 2048, and the lower limit of the receiving window will determine the position of the receiving window. For example, if the lower limit of the receiving window is 10, then the receiving window The window will receive packets with SNs from 10 to 2057, and will not receive packets that fall outside the receive window.

The lower limit of the receiving window is dynamically changed and determined by the SN of the latest successfully received data packet. For example, the receiving end receives the data packets in sequence. When the SN of the first data packet successfully received is 0, it will receive The lower limit of the window is determined to be 0. At this time, the data packets with SN from 0 to 2027 will fall into the receiving window and can be received by the sender; then, the SN of the second data packet received by the receiver is 1, then the lower limit of the receiving window The value is updated to 1. At this time, the data packets whose SN is 1 to 2048 will fall into the receiving window. Similarly, the receiving window will slide with the SN of the successfully received data packets, and the reception of multiple data packets will be completed in turn. When the lower limit of the receiving window is flipped, the receiving end will update the HFN maintained by itself, so that the HFN of the receiving end and the transmitting end can be synchronized, so that the receiving end can obtain each HFN through the HFN maintained by itself and the SN carried in the data packet. The correct count of the packet, and the packet is decrypted with the correct count.

In the case of data traffic switching, the sender will send data packets to the target end (base station), and the target end will forward the data packets to the receiving end. Due to the instability of the channel between the base station and the base station, a large number of packet loss will occur. This may cause the HFN maintained by the receiving end and the sending end to be different, so that the receiving end cannot decrypt the data packets normally, resulting in interrupted and unrecoverable traffic. For example, at a certain moment, the sender sends 5000 data packets to the receiver through the target end, and the corresponding SN space size is 4096, the sender first determines the SN of 5098 data packets in turn, and the sender starts from 0 to number, The HEN corresponding to the first 4096 data packets is 0, and the SN is from 0 to 4095 in turn; the sender starts from the 4098th data packet, adds 1 to the HFN it maintains, and then starts from 0. Number the 4098th data packet, That is, the HFN corresponding to the 4098th to 5098th data packets is 1, and the SN is 0 to 999. The sender then sends these packets to the target in turn.

The target end forwards the successfully received data packets. It is understandable that the initial HFN stored by the receiving end itself is also 0, and the corresponding window length is 2048, that is, the initial receiving window is 0 to 2047; if the target side successfully forwards the SN If the data packet is 1 to the receiving end, the receiving end's receiving window will be updated to 1 to 2048. If no packet loss occurs, that is, when the receiving end successfully receives the 4096th data packet, the receiving end will determine the new lower limit of the receiving window. 4095, and update the receiving window to 4095 to 2046. When the 4097th data packet is received again, since the SN of the 4097th data packet is 0, the receiver judges that the lower limit value of the window will be sent and flipped, and it will save itself. Increase HFN by 1 to keep the HFN of the receiver and transmitter the same.

However, in the case of a large number of packet loss, the data packets received by the receiver will not be consecutive data packets. In the above example, if the receiver's receiving window is updated to 1 to 2048, and all the data packets with SNs from 2 to 2048 Lost, after the receiving end successfully receives the data packet with SN of 1, the SN number of the received data packet does not fall into the receiving window, then the receiving window will discard the received data packet and maintain the original receiving window and HFN It remains unchanged, that is, the window of the receiver is 1 to 2048, and the HFN is 0; then, when the receiver receives the 4097th to 5098th data packets again, because its corresponding SN number is 0 to 999, it successfully falls into the In the receiving window, the receiving end will receive these data packets, but since the receiving end does not perceive the flip of the lower limit of the receiving window, it still considers HFN to be 0, but in fact, the 4097th to 5098th data packets correspond to The HFN is already 1, so the HFN of the sender and the receiver are inconsistent, and the receiver cannot decrypt the received data packets, resulting in traffic interruption.

Based on the above problems, the embodiments of the present application provide a data transmission method and related equipment. When determining the SN corresponding to the data packet, the PDCP layer at the transmitting end can only number the SN of a part of the data packet, and then part of the data packet carries the SN to the data packet. The target side sends, and part of it does not carry the SN and sends it to the target side. After receiving the data packet without the SN, the target side will number its SN before sending it. Finally, the data packets received by the receiving end all carry the SN. .

FIG. 1 is a schematic flowchart of a data transmission method provided by an embodiment of the present application; as shown in FIG. 1 , the data transmission method includes the following steps:

101. The sender determines the number N of the first data packets carrying the SN according to the length of the receiving window;

In the flow switching process, the sender sends the data packet to the target, and then the target forwards the data packet for the receiver; before sending the data packet, the sender first determines the number N of the first data packets carrying the SN, and then In the sequence of data packets to be sent, N data packets are selected as the first data packets, and the remaining data packets are determined as the second data packets; wherein, the number of the first data packets is smaller than the length of the receiving window (PDCP reordering window) .

Exemplarily, the length of the SN configured by the upper layer is 12 bits, that is, the space size of the SN is 2 ¹² =4096; generally, the receiving window corresponding to the receiving end occupies half of the space size of the SN; that is, the length of the receiving window is 2048, then, The number of first data packets determined by the sender cannot exceed 2047. For example, the sender needs to send 3000 data packets, so that the first 2047 data packets in the sequence of data packets to be sent can be selected as the first data packet. From the beginning of the 2048th data packet to the 3000th data packet, it can be determined that it is the second data packet that does not carry the SN.

It can be understood that in the process of PDCP data forwarding, PDCP data forwarding includes PDCP data forwarding in handover scenarios, and PDCP data forwarding in NSA scenarios; this method can not only be applied to traffic handover scenarios in LTE systems, but also can be applied to NR. The traffic switching scenario under the system can also be applied to the traffic switching scenario between the LTE system and the NR system, which is not specifically limited.

102. The sender sequentially numbers the SNs of the N first data packets;

After the sender determines the first data packet, it can sequentially number the SNs of the first data packet. For example, in the above example, the sender determines that the SNs of the first to 2047th data packets are 0 to 2047 in sequence. 2046.

103. The sending end sends the first data packet and the second data packet to the target end;

The sending end sends the first data packet and the second data packet to the target end, and then the target end sends the received data packet to the receiving end. It is understandable that the first data packet sent by the sending end to the target end carries the SN , the second data packet does not carry the SN.

It is understandable that when the number of the first data packet and the second data packet sent exceeds 4096, the HFN of the sending end needs to be incremented by 1, and then the subsequent data packets continue to be numbered from 0.

104. The sender sends indication information to the target;

The sending end also needs to send indication information to the target end, where the indication information is used to instruct the target end to number the second data packet without the SN, and forward the second data packet to the receiving end after re-carrying the SN.

The receiving end can receive the data packets in sequence according to the SN carried in the data packet, and can judge the packet loss situation according to the SN. Therefore, the target end needs to number the second data packet that does not carry the SN before forwarding.

Exemplarily, the indication information includes the serial number of the sending end, for example, sending the upper limit of the number corresponding to the sending end to the target end, and instructing the target end to number the second data packet received following the upper limit value; In the above example, the sender determines that the number of first data packets is 2047, then the sender can determine the first to 2047th data packets of the sequence to be sent as the first data packet, and determine its corresponding SN as 0 to 2046. Then, the sender can determine that the upper limit of the number is 2047, that is, the corresponding SN of the next packet. The sender carries the count value of the next packet in the indication information and sends it to the target. The target end starts numbering from 2047 to the received second data packet that does not carry the SN.

105. The target terminal numbers the SN corresponding to the second data packet according to the indication information sent by the sender;

The target end numbers the second data packet, and then forwards the first data packet and the numbered second data packet to the target end in turn. The phenomenon of packets occurs. If each data sent by the sender carries SN, a large number of data packets carrying SN will be lost. When the number of lost packets exceeds the length of the receiving window, the data packets received by the receiving end will fall into the receiving window. In addition, it cannot slide normally, and eventually the HFNs of the sender and the receiver are different; when the target end numbers the second data packet, the target end only numbers the received second data packet, no matter how many packets are lost, the target end The terminal will only number the second data packet that is successfully received, and then forward the first data packet and the second data packet to the receiving end. In this way, the first second data packet sent by the target end will fall within the receiving window. , the receiving window is updated, and then the HFN is normally maintained according to the lower limit of the receiving window, and finally, the HFN of the sender and the receiver is guaranteed to be synchronized to avoid traffic interruption.

Exemplarily, the length of the SN configured by the upper layer is 12 bits, that is, the space size of the SN is 2 ¹² =4096, the length of the receiving window is 2048, and the receiving end needs to send 5000 data packets to the transmitting end; the receiving end first determines the first data packet. The number of packets, so that it does not exceed 2048, for example, the number of the first data packet is determined to be 2000; in this way, the sender determines the SN of the first 2000 data packets in the transmission sequence, numbered in sequence from 0 to 1999, and determines The last 3000 data packets are sent without SN; then the target end is instructed to start numbering the data packets without SN from 2000.

It is understandable that even if there is a lot of packet loss between the sender and the target, for example, starting from the third packet, a total of 2048 packets are lost, then the 2051st packet is successfully received by the target. When the target terminal still follows the instructions of the sender, the numbering starts from 2001, that is, the number of the 2051st second data packet without SN is 2001. In this way, it can fall into the receiving window of the receiving terminal, and the receiving terminal will Perform normal reception, and update the position of the receiving window according to its SN; when the receiving end receives the first data packet again, that is, when the SN of the received data packet does not exceed 1999, it can be determined that the lower limit of the receiving window has flipped, Just add 1 to the HFN it maintains. In this way, it can be ensured that the HFN of the sender and the receiver are consistent, so that the receiver can successfully decrypt the received data packets to avoid traffic interruption.

106. The target end forwards the first data packet and the numbered second data packet to the receiving end;

107. The sender determines the total number of sent data packets;

It is understandable that when a large amount of packet loss occurs between the sender and the destination, it will lead to abnormal transmission, and even traffic interruption cannot be recovered. Then the sender can determine the total number of packets to be sent before sending packets. , and then according to the number of packets successfully received by the target end, determine whether a large number of packet loss occurs, and then take relevant measures for the large number of packet loss.

108. The sender sends the request information to the target;

In a specific implementation manner, the sender sends request information to the target, where the request information is used to instruct the target to report the total number of successfully received data packets, and then the sender checks whether a large number of packets are lost.

109. The target terminal determines the total number of successfully received data packets according to the request information;

110. The target terminal reports the total number of successfully received data packets to the sender;

The target end reports the total number of successfully received data packets to the sender according to the indication information.

111. The sender determines the packet loss situation according to the total number of successfully received data packets reported by the target end;

After obtaining the total number of successfully received data packets sent by the target end, the sender determines the number of lost packets. Exemplarily, the total number of successfully received data packets is subtracted from the total number of sent data packets to obtain the lost number of packets. The number of packets, and then determine whether the number of lost packets reaches the preset threshold, and then make corresponding ear processing according to the judgment result.

112. The sender sends the total number of packets sent to the target;

Exemplarily, the sending end may also send the total number of sent data packets to the target end, and the target end determines the packet loss situation on the link.

113. The target terminal determines the packet loss situation according to the total number of sent data packets and the total number of successfully received data packets;

The target end uses the received total number of data packets sent by the sender and subtracts the total number of successfully received data packets to determine the packet loss situation.

114. The target end reports the packet loss situation to the sender;

It can be understood that steps 108 to 111 and steps 112 to 114 are optional steps. When step 108 is performed, steps 109, 110 and 111 need to be performed; when step 112 is performed, steps 113 and 114 are performed.

115. The sender determines whether there is an abnormality in packet sending according to the packet loss situation;

The sender makes corresponding processing according to the packet loss situation. For example, the preset threshold can be the number corresponding to the receiving window. When the number of lost packets exceeds the length of the receiving window, it can reset the retransmission or release the receiving end.

FIG. 2 is a schematic structural diagram of a sending device provided by this application. As shown in FIG. 2 , the sending device includes:

The determining unit 201 is configured to determine, according to the length of the receiving window corresponding to the receiving end, the number N of the first data packets in the data packets to be sent; The M is greater than the length of the receiving window, and the N is less than the length of the receiving window;

a processing unit 202, configured to number the sequence number SN of the first data packet;

The determining unit 201 is further configured to determine that the remaining generation sending data packet is the second data packet; the second data packet does not carry the SN;

A sending unit 203, configured to sequentially send the first data packet and the second data packet to the target end, so that the target end forwards the first data packet and the second data packet to the receiving end .

Exemplarily, the sending unit 203 is further configured to send indication information to the target terminal; the indication information includes the upper limit value of the number of the transmitting terminal; the indication information is used to instruct the target terminal to receive The SN of the second data packet is numbered.

Exemplarily, the processing unit 202 is further configured to update the stored superframe number HFN when the number of sent data packets exceeds the SN length;

The determining unit 201 is further configured to re-determine the number N of the first data packets in the generation transmission data packets from the initial state;

The processing unit 202 is further configured to number the SN of the first data packet in the on behalf of the transmission data packet.

Exemplarily, the determining unit 201 is further configured to determine the total number of sent data packets, and send the total number of sent data packets to the target end.

Exemplarily, the sending device further includes a receiving unit 204:

The receiving unit 204 is configured to receive feedback information sent by the target terminal, where the feedback information includes the total number of data packets successfully received by the target terminal;

The determining unit 201 is further configured to determine whether the number of lost packets reaches a preset threshold according to the feedback information; if it reaches the preset threshold, determine that the PDCP layer determines that the packet transmission is abnormal.

FIG. 3 is a schematic structural diagram of a forwarding device provided by the application. As shown in FIG. 3 , the forwarding device includes:

A receiving unit 301, configured to receive a first data packet and a second data packet sent by a sending end; wherein, the first data packet carries a sequence number SN, the second data packet does not carry an SN, and the first data packet The number N of the packets is less than the length of the receiving window corresponding to the receiving end; the processing unit 302 is used to number the SN of the second data packet;

The sending unit 303 is configured to send the first data packet and the numbered second data packet to the receiving end in sequence.

Exemplarily, the receiving unit 301 is further configured to receive indication information sent by the transmitting end; the indication information includes the upper limit of the number of the transmitting end;

The processing unit 302 is specifically configured to sequentially number the SN number of the second data packet according to the upper limit value of the number.

Exemplarily, the forwarding device further includes a determining unit 304;

The receiving unit 301 is further configured to receive the total number of sent data packets sent by the sending end;

The determining unit 304 is used to determine the total number of packets successfully received by oneself; according to the total number of packets sent and the total number of packets successfully received by oneself, determine the packet loss situation ;

The sending unit 303 is further configured to send feedback information to the sending end, where the feedback information is used to report the packet loss situation to the sending end.

Exemplarily, the forwarding device further includes a determining unit 304;

The determining unit 304 is used to determine the total number of packets successfully received by itself;

The sending unit 303 is further configured to send the total number of data packets successfully received by itself to the sending end.

Please refer to FIG. 4 , which is a schematic structural diagram of another sending device 400 provided by an embodiment of the present application. The sending device 400 includes: a processor 401 , a memory 402 , and a communication interface 403 .

The processor 401, the memory 402, and the communication interface 403 are connected to each other through a bus; the bus can be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 4, but it does not mean that there is only one bus or one type of bus.

The memory 402 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory) ), a hard disk drive (HDD) or a solid-state drive (SSD); the memory 402 may also include a combination of the above-mentioned types of memory.

The processor 401 may be a central processing unit (central processing unit, CPU), a network processor (English: network processor, NP), or a combination of CPU and NP. The processor 401 may further include a hardware chip. The above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (generic array logic, GAL) or any combination thereof.

The communication interface 403 may be a wired communication interface, a wireless communication interface or a combination thereof, wherein the wired communication interface may be, for example, an Ethernet interface. The Ethernet interface can be an optical interface, an electrical interface or a combination thereof. The wireless communication interface may be a WLAN interface, a cellular network communication interface or a combination thereof, and the like.

The processor 401 is configured to run the computer program or instructions in the memory 402 to perform the steps performed by the sender in any possible implementation manner of the embodiment shown in FIG. 1 .

Please refer to FIG. 5 , which is a schematic structural diagram of another forwarding device 500 provided by an embodiment of the present application. The forwarding device 500 includes: a processor 501 , a memory 502 , and a communication interface 503 .

The processor 501, the memory 502, and the communication interface 503 are connected to each other through a bus; the bus may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 5, but it does not mean that there is only one bus or one type of bus.

The memory 502 may include volatile memory (volatile memory), such as random-access memory (random-access memory, RAM); the memory may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory) ), hard disk drive (HDD) or solid-state drive (solid-state drive, SSD); the memory 502 may also include a combination of the above-mentioned types of memory.

The processor 501 may be a central processing unit (central processing unit, CPU), a network processor (English: network processor, NP) or a combination of CPU and NP. The processor 501 may further include a hardware chip. The above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (generic array logic, GAL) or any combination thereof.

The communication interface 503 may be a wired communication interface, a wireless communication interface or a combination thereof, wherein the wired communication interface may be, for example, an Ethernet interface. The Ethernet interface can be an optical interface, an electrical interface or a combination thereof. The wireless communication interface may be a WLAN interface, a cellular network communication interface, a combination thereof, or the like.

The processor 501 is configured to run the computer program or instructions in the memory 502 to perform the steps performed by the target in any possible implementation manner of the embodiment shown in FIG. 1 .

An embodiment of the present application further provides a chip or a chip system, the chip or chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected through a line, and the at least one processor is used for running a computer program or instruction, To perform a data sending method described in any one of any possible implementation manners of the embodiment shown in FIG. 1;

Embodiments of the present application also provide a computer storage medium, where the computer storage medium is used to store the computer software instructions used for the above-mentioned sending device, which includes a program for executing a program designed for the sending device.

Embodiments of the present application also provide a computer storage medium, where the computer storage medium is used for storing the computer software instructions used for the above-mentioned forwarding device, which includes a program for executing a program designed for the forwarding device.

Embodiments of the present application further provide a computer program product, where the computer program product includes computer software instructions, and the computer software instructions can be loaded by a processor to implement the above-mentioned process in a data sending method.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and 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 in this 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 alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), magnetic disk or optical disk and other media that can store program codes .

Claims

A data transmission method, characterized in that the method comprises:

The packet data aggregation protocol PDCP layer of the sending end determines the number N of the first data packets in the data packets to be sent according to the length of the receiving window corresponding to the receiving end; wherein, the generation sending data packet sequence includes M generation sending data packets , the M is greater than the length of the receiving window, and the N is less than the length of the receiving window;

The sending end numbers the sequence number SN of the first data packet;

The sending end determines that the remaining generation to send the data packet is the second data packet; the second data packet does not carry the SN;

The sending end sends the first data packet and the second data packet to the target end in sequence, so that the target end forwards the first data packet and the second data packet to the receiving end.
The method according to claim 1, wherein the method further comprises:

The sending end sends indication information to the target end; the indication information includes the upper limit value of the number of the sending end; the indication information is used to indicate the SN of the second data packet received by the target end number.
The method according to any one of claims 1 to 2, wherein the method further comprises:

When the number of sent data packets exceeds the SN length, the sending end updates the stored superframe number HFN;

The sending end starts from the initial state, and re-determines the number N of the first data packets in the data packets that are sent on behalf of;

The sending end numbers the SN of the first data packet in the on behalf of the sending data packet.
The method according to any one of claims 1 to 3, wherein the method further comprises:

The sending end determines the total number of sent data packets, and sends the total number of sent data packets to the target end.
The method according to claim 4, wherein the method further comprises:

The sending end receives feedback information sent by the target end, where the feedback information includes the total number of data packets successfully received by the target end;

The sending end judges whether the number of lost packets reaches a preset threshold according to the feedback information;

If the preset threshold is reached, the PDCP layer of the transmitting end determines that the packet transmission is abnormal.
A data transmission method, characterized in that the method comprises:

The target end receives the first data packet and the second data packet sent by the transmitting end; wherein, the first data packet carries the sequence number SN, the second data packet does not carry the SN, and the number of the first data packet N is less than the length of the receiving window corresponding to the receiving end;

The target end numbers the SN of the second data packet;

The target end sends the first data packet and the numbered second data packet to the receiving end in sequence.
The method according to claim 6, wherein the method further comprises:

The target terminal receives the indication information sent by the transmitting terminal; the indication information includes the upper limit value of the number of the transmitting terminal;

The target end sequentially numbers the SN number of the second data packet according to the upper limit value of the number.
The method according to any one of claims 6 to 7, wherein the method further comprises:

The target terminal receives the total number of sent data packets sent by the sender;

The target terminal determines the total number of data packets successfully received by itself;

The target end determines the packet loss situation according to the total number of the sent data packets and the total number of data packets successfully received by the target end. The target end sends feedback information to the transmitting end, and the feedback The information is used to report the packet loss situation to the sender.
The method according to any one of claims 6 to 7, wherein the method further comprises:

The target terminal determines the total number of data packets successfully received by itself, and sends the total number of data packets successfully received by itself to the sender.
A sending device, characterized in that the sending device comprises:

a determining unit, configured to determine the number N of the first data packets in the data packets to be sent according to the length of the receiving window corresponding to the receiving end; wherein, the generation sending data packet sequence includes M generation sending packets, the M is greater than the length of the receiving window, and the N is less than the length of the receiving window;

a processing unit, configured to number the sequence number SN of the first data packet;

The determining unit is further configured to determine that the remaining generation sending data packet is the second data packet; the second data packet does not carry the SN;

A sending unit, configured to sequentially send the first data packet and the second data packet to the target end, so that the target end forwards the first data packet and the second data packet to the receiving end.
The sending device according to claim 10, wherein the sending unit is further configured to send indication information to the target end; the indication information includes an upper limit value of the number of the transmitting end; instructing the target end to number the SN of the second data packet received.
The sending device according to any one of claims 10 to 11, wherein the processing unit is further configured to update the stored hyperframe number HFN when the number of the data packets sent exceeds the SN length;

The determining unit is also used to re-determine the number N of the first data packets in the generation transmission data packets from the initial state;

The processing unit is further configured to number the SN of the first data packet in the on behalf of the transmission data packet.
The sending device according to any one of claims 10 to 12, wherein the determining unit is further configured to determine the total number of sent data packets, and send the total number of sent data packets to the target.
The sending device according to claim 13, wherein the sending device further comprises a receiving unit:

The receiving unit is configured to receive feedback information sent by the target terminal, where the feedback information includes the total number of data packets successfully received by the target terminal;

The determining unit is further configured to determine whether the number of lost packets reaches a preset threshold according to the feedback information; if it reaches the preset threshold, determine that the PDCP layer determines that the packet transmission is abnormal.
A forwarding device, characterized in that the forwarding device comprises:

a receiving unit, configured to receive the first data packet and the second data packet sent by the sending end; wherein, the first data packet carries the sequence number SN, the second data packet does not carry the SN, and the first data packet The number N is less than the length of the receiving window corresponding to the receiving end;

a processing unit, configured to number the SN of the second data packet;

A sending unit, configured to send the first data packet and the numbered second data packet to the receiving end in sequence.
The forwarding device according to claim 15, wherein the receiving unit is further configured to receive indication information sent by the transmitting end; the indication information includes an upper limit value of the number of the transmitting end;

The processing unit is specifically configured to sequentially number the SN number of the second data packet according to the upper limit value of the number.
The forwarding device according to any one of claims 15 to 16, wherein the forwarding device further comprises a determining unit;

The receiving unit is further configured to receive the total number of sent data packets sent by the sending end;

The determining unit is used to determine the total number of data packets that have been successfully received by oneself; according to the total number of the data packets that have been sent and the total number of data packets that have been successfully received by itself, determine the packet loss situation;

The sending unit is further configured to send feedback information to the sending end, where the feedback information is used to report the packet loss situation to the sending end.
The forwarding device according to any one of claims 15 to 16, wherein the forwarding device further comprises a determining unit;

The determining unit is used to determine the total number of data packets successfully received by itself;

The sending unit is further configured to send the total number of data packets successfully received by itself to the sending end.
A computer-readable storage medium storing one or more computer-executable instructions, characterized in that, when the computer-executable instructions are executed by a processor, the processor executes the above-mentioned claims 1-5 or claim 6- 9 The method of any one.