WO2018201960A1

WO2018201960A1 - Method and device for performing feedback

Info

Publication number: WO2018201960A1
Application number: PCT/CN2018/084601
Authority: WO
Inventors: 刘佳敏
Original assignee: 电信科学技术研究院有限公司
Priority date: 2017-05-04
Filing date: 2018-04-26
Publication date: 2018-11-08
Also published as: CN107276727A

Abstract

Disclosed are a method and device for performing feedback, which are used for solving the problem existing in the prior art whereby if a plurality of continuous PDUs simultaneously undergo packet loss, an RLC status report comprises SNs of the PDUs with packet loss, thereby making efficiency relatively low, wasting transmission resources and not aiding in increasing air interface efficiency and processing efficiency. In the embodiments of the present invention, a receiving device determines continuous loss feedback information corresponding to one segment of PDUs with packet loss, and sends a status report including the continuous loss feedback information to a sending device, wherein the continuous loss feedback information comprises an SN of at least one PDU, and does not comprise SNs of all PDUs in the segment of PDUs with packet loss. Since the continuous loss feedback information does not comprise the SNs of all the PDUs in the segment of PDUs with packet loss, when a plurality of continuous PDUs simultaneously undergo packet loss, RLC status report overheads are saved, thereby increasing efficiency, and saving on transmission resources.

Description

Method and device for performing feedback

This application claims the priority of the Chinese Patent Application, filed on May 4, 2017, the entire disclosure of which is hereby incorporated by reference. in.

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and device for performing feedback.

Background technique

The data transmission between the UE (User Equipment, User Equipment, also referred to as the terminal) and the eNB (Evolved Base Station) is usually through PDCP (Packet Data Convergence Protocol), RLC (Radio Link Control), and radio link control. ), MAC (Medium Access Control) and PHY (Physical Layer) transmission, each layer completes different data processing. PDCP mainly performs security operations and header compression and decompression processing, such as encryption and integrity protection, ROHC (RObust Header Compression) compression and decompression, etc.; RLC mainly completes segmentation and sequential delivery of data. And ARQ (Automatic Repeat reQuest) data transmission guarantee; MAC mainly completes scheduling and cascade processing of different logical channels and HARQ (Hybrid Automatic Repeat reQuest) operation; physical layer completes the transmission block into Packets and air ports are sent.

The RLC layer supports three modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). When the RLC AM and the UM are transmitting data, the RLC SDUs (Service Data Units) are organized into RLC PDUs one by one, that is, the RLC SDU and the RLC PDU (Protocol Data Unit) are one-to-one. Mapping. When the MAC transmission opportunity arrives, the RLC organizes several RLC PDUs and necessary RLC PDU segments according to the size of the transmission resources, sends them to the MAC, performs group packets and transmits them.

In the status report feedback of the RLC, the mandatory ACK_SN (ACK: ACKnowledge, SN: Sequence Number) information is required to indicate the SN number of the highest PDU that can currently confirm the receiving status. When there is a packet loss, NACK_SN (NACK: Negative ACKnowledge) and possible segmentation information are also carried in the same status report to indicate which PDU or PDU segment is lost and needs to be retransmitted. The RLC guarantees the success rate of the higher data transmission through the status report feedback and the retransmission mechanism, and meets the requirements of the QoS (Quality of Service).

In the future development of mobile communication systems, in order to better meet user needs and greatly improve network capacity and throughput, new air interface transmission modes, more network nodes, and complex network topologies will be introduced in 5G. In the 5G network, the processing of data by the RLC cancels the cascading function, that is, the RLC SDUs form a RLC PDU one-to-one, so in a transmission opportunity, there is a high possibility to transmit several RLC PDUs.

In the prior art, the RLC status report can only carry a single granularity of PDU SN information when transmitting. When the RLC cascading is cancelled, the number of PDUs sent at a time will be relatively large. In the case of packet loss, a number of consecutive PDUs will be simultaneously lost. At this time, the SNs of several consecutive PDUs are carried one by one. This method is inefficient. The waste of transmission resources is not conducive to the improvement of air interface efficiency and processing efficiency.

Summary of the invention

The present invention provides a method and a device for performing feedback to solve the problem that if multiple consecutive PDUs are simultaneously lost in the prior art, the RLC status report includes the SN of the lost packet, thereby causing low efficiency and wasteful transmission. Resources are not conducive to the problem of air interface efficiency and processing efficiency.

A method for performing feedback provided by an embodiment of the present invention includes:

For any PDU that is lost, the receiving device determines the continuous loss feedback information corresponding to the lost PDU, where the continuous loss feedback information includes the SN of at least one PDU, and does not include the SN of all the PDUs in the lost PDU. ;

The receiving device sends a status report of the continuous loss feedback information corresponding to the at least one segment lost PDU to the sending device, so that the sending device determines the PDU lost in the corresponding segment according to the continuous loss feedback information.

Another method for performing feedback provided by an embodiment of the present invention includes:

The sending device receives a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include all PDUs in the lost PDU SN;

The transmitting device determines at least one segment lost PDU according to the continuous loss feedback information.

A receiving device for performing feedback according to an embodiment of the present invention, the receiving device includes:

An information determining module, configured to determine continuous loss feedback information corresponding to the lost PDU for any piece of lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the lost PDU in the segment SN of all PDUs;

And a sending module, configured to send, to the sending device, a status report that includes continuous loss feedback information corresponding to the at least one segment lost PDU, so that the sending device determines, according to the continuous loss feedback information, the corresponding segment lost PDU.

A sending device for performing feedback according to an embodiment of the present invention, where the sending device includes:

a receiving module, configured to receive a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the lost PDU SN of all PDUs;

And a processing module, configured to determine, according to the continuous loss feedback information, at least one segment lost PDU.

A receiving device provided by an embodiment of the present invention includes:

A processor for transmitting and receiving data through the transceiver and reading the program in the memory, performing the following process:

Determining continuous loss feedback information corresponding to the lost PDU for any PDU that is lost, wherein the continuous loss feedback information includes an SN of at least one PDU, and does not include an SN of all PDUs in the lost PDU; And sending, by the sending device, a status report that includes the consecutive lost feedback information corresponding to the missing PDU of the segment to the sending device, so that the sending device determines, according to the continuous loss feedback information, the PDU with the corresponding segment loss;

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

A sending device provided by an embodiment of the present invention includes:

Receiving a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, wherein the consecutive loss feedback information includes an SN of at least one PDU, and does not include an SN of all PDUs in the lost PDU Determining at least one segment lost PDU according to the continuous loss feedback information;

In the embodiment of the present invention, the receiving device determines the continuous loss feedback information corresponding to a lost PDU, and sends a status report including the continuous loss feedback information to the sending device, where the continuous loss feedback information includes the SN of at least one PDU, and does not The SN of all PDUs in the lost PDU is included. Since the continuous loss feedback information does not include the SNs of all the PDUs in the lost PDU, thereby simultaneously dropping packets in multiple consecutive PDUs, the overhead of the RLC status report is saved, thereby improving efficiency and saving transmission resources.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for inventive labor.

1 is a schematic structural diagram of a system for performing feedback according to an embodiment of the present invention;

2 is a schematic diagram of a first type of packet loss according to an embodiment of the present invention;

3 is a schematic diagram of a second type of packet loss according to an embodiment of the present invention;

4 is a schematic diagram of a first status report format according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a second status report format according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a second status report format according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a first receiving device according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a first sending device according to an embodiment of the present invention;

9 is a schematic structural diagram of a second receiving device according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a second sending device according to an embodiment of the present invention;

11 is a schematic flowchart of a method for performing feedback according to an embodiment of the present invention;

FIG. 12 is a schematic flowchart of a second method for performing feedback according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which . All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1, the system for performing feedback in the embodiment of the present invention includes: a receiving device 10 and a transmitting device 20.

The receiving device 10 is configured to determine continuous loss feedback information corresponding to the lost PDU for any piece of the lost PDU, where the continuous loss feedback information includes the SN of the at least one PDU, and does not include the lost PDU. The SN of all the PDUs is sent to the sending device, where the status report of the continuous loss feedback information corresponding to the at least one segment lost PDU is sent, so that the sending device determines the PDU with the corresponding segment loss according to the continuous loss feedback information;

The sending device 20 is configured to receive a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, and determine at least one segment lost PDU according to the continuous loss feedback information.

In the embodiment of the present invention, the receiving device determines the continuous loss feedback information corresponding to a lost PDU, and sends a status report including the continuous loss feedback information to the sending device, where the continuous loss feedback information includes the SN of at least one PDU, and does not The SN of all PDUs in the lost PDU is included. Since the continuous loss feedback information does not include the SNs of all the PDUs in the lost PDU, thereby simultaneously dropping packets in multiple consecutive PDUs, the overhead of the RLC status report is saved, thereby improving efficiency and saving transmission resources; further improving Air interface efficiency and processing efficiency.

The SN of the continuous loss feedback information in the embodiment of the present invention that does not include all the PDUs in the lost PDU includes one of the following conditions:

1. The continuous loss feedback information includes an SN of a part of the PDUs in the lost PDU;

2. The continuous lost feedback information does not have the SN of any one of the PDUs in the lost PDU.

The continuous loss feedback information in the embodiment of the present invention includes information that enables the sending device to determine a lost PDU.

For example, the SN of one PDU and the number of PDUs lost in the corresponding segment may be included;

An SN including two PDUs in the continuous loss feedback information may also be included.

The continuous loss feedback information includes different information, and the specific information has different meanings. Several are listed below.

1. The number of SNs including one PDU and the number of PDUs lost in the corresponding segment in the continuous loss feedback information.

1. If the SN of the one PDU is the SN of the first PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the first PDU or does not include the first PDU.

For example, if the SN of a lost PDU is 10 to 15, the SN of the first PDU, that is, 10, is continuously lost in the feedback information. The number of lost PDUs is 6 if the SN of the first PDU is included, and 5 if the SN of the first PDU is not included.

The specific inclusion or not includes the agreement in the agreement, and can also be determined by both the sending and receiving parties. As long as the sender and receiver can be guaranteed to be consistent.

2. If the SN of the one PDU is the SN of the last PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the last PDU or does not include the last PDU.

For example, if the SN of a lost PDU is 10 to 15, the SN of the first PDU, that is, 15 is included in the continuous loss feedback information. The number of lost PDUs is 6 if the SN of the first PDU is included, and 5 if the SN of the first PDU is not included.

3. If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.

For example, if the SN of a lost PDU is 10 to 15, the SN of one PDU included in the continuous loss feedback information is the SN of the first PDU located before the first PDU, that is, 9. The number of lost PDUs is 6.

4. If the SN of the one PDU is the SN of the PDU that is located later and adjacent to the PDU that is lost by the corresponding segment, the number of PDUs lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.

For example, if the SN of a lost PDU is 10 to 15, the SN of one PDU included in the continuous loss feedback information is the SN of the first PDU located after the last PDU, that is, 16. The number of lost PDUs is 6.

Which of the above several methods can be specifically used in the agreement can also be determined by both the sending and receiving parties. As long as the sender and receiver can be guaranteed to be consistent.

2. The continuous loss feedback information includes an SN including two PDUs in the continuous loss feedback information.

1. The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU and the SN of the last PDU in the PDU that is lost in the corresponding segment.

For example, if the SN of a lost PDU is 10 to 15, the SN of the first PDU and the SN of the last PDU, that is, 10 and 15, are included in the continuous loss feedback information.

2. The SNs of the two PDUs included in the continuous loss feedback information are the SN of the PDU and the SN of the last PDU that are located in front of the PDU that is adjacent to the corresponding segment.

For example, if the SN of a lost PDU is 10 to 15, the continuous loss feedback information includes the SN of the first PDU located before the first PDU and the SNs of the last PDU, that is, 9 and 15.

3. The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU in the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment.

For example, if the SN of a lost PDU is 10 to 15, the continuous loss feedback information includes the SN of the first PDU and the SNs of the first PDU behind the last PDU, that is, 10 and 16.

4. The SN of the two PDUs included in the continuous loss feedback information is the SN of the PDU that is located in front of the PDU that is adjacent to the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment. .

For example, if the SN of a lost PDU is 10 to 15, the continuous loss feedback information includes the first one before the first PDU and the first one after the last PDU, that is, 9 and 16.

The above describes the case where the lost PDU is a complete PDU. In implementations, it is also possible that the first and/or last PDU in a continuously lost PDU is a segmentation PDU. The segmentation PDU is a part of the correctly received, part of the lost PDU.

If the first of the consecutively lost PDUs is a segmentation PDU, the last N bytes in the first PDU are lost;

If the last one of consecutively lost PDUs is a segmentation PDU, the first N bytes in the last PDU are lost.

Optionally, if the segment lost PDU includes a segment PDU, the continuous loss feedback information may include segment offset information corresponding to the segment PDU, in addition to the information included in the foregoing, so that the sending device is configured according to The segment offset information determines the missing bytes in the segmentation PDU.

In the implementation, the segment offset information includes a lot of content, and several are listed below.

1. If the segment PDU is the first PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information used to determine the received success byte in the first PDU or used to determine the first PDU. Missing byte information.

For example, the first PDU has a total of 500 bytes and is lost 200 bytes. If the segment offset information includes information for determining a success byte received in the first PDU, the information is 300; if the segment offset information includes information for determining a missing byte in the first PDU, the information Is 200.

Which method is specifically adopted may be agreed in the agreement, or may be determined by both the sending and receiving parties. As long as the sender and receiver can be guaranteed to be consistent.

2. If the segment PDU is the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information for determining the success byte received in the last PDU or used to determine the missing byte in the last PDU. Information.

For example, the last PDU has a total of 500 bytes and is lost 200 bytes. If the segment offset information includes information for determining a success byte received in the last PDU, the information is 300; if the segment offset information includes information for determining a missing byte in the last PDU, the information is 200. .

3. If the segment PDU is the first PDU and the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information used to determine the received success byte in the first PDU or used to determine the The information of the missing bytes in a PDU, as well as information for determining the success byte received in the last PDU or for determining the missing byte in the last PDU.

For example, the first PDU has a total of 600 bytes, 200 bytes after the loss, the last PDU has a total of 500 bytes, and 200 bytes after the loss. If the segment offset information includes information for determining a success byte received in the first PDU, the information is 400; if the segment offset information includes information for determining a missing byte in the first PDU, the information 200; if the segment offset information includes information for determining a success byte received in the last PDU, the information is 300; if the segment offset information includes information for determining a missing byte in the last PDU, The information is 200.

In an implementation, in order to further improve efficiency, the continuous loss feedback information may also include, but is not limited to, some or all of the following information:

Information indicating whether the first PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether the last PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost. This information needs to be indicated as long as at least one of the first PDU and the last PDU is a segment PDU. There are segmentation PDUs.

Optionally, the information indicating whether the first PDU in the PDU that is lost in the corresponding segment is a segmentation PDU is located in a segment indication field of the status report; or

The information indicating whether the last PDU in the PDU lost in the corresponding segment is a segment PDU is located in a segment indication field of the status report; or

The information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost is located in the segment indication field of the status report.

In the implementation, a dedicated segmentation indicator field can be set.

The logic here consists of three ways:

1. For information indicating whether the first PDU in the PDU in which the corresponding segment is lost is a segment PDU, the first segment may use a 1-bit segment indication field separately;

2. For the information indicating whether the last PDU in the PDU lost in the corresponding segment is a segment PDU, the last segment can use the 1-bit segment indication field separately;

3. For the information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost, the first and last segments may jointly use a segment indication field, such as 1 bit. It can also be 2bit, indicating whether it is a segment, and indicating which segment is segmented, such as 00 for no segmentation, 10 for segmentation, 01 for segmentation, 11 for first and last segment It is all segmentation.

In the implementation, there are sometimes consecutive lost PDUs, and sometimes there are no consecutive lost PDUs. Based on this, an optional manner is added to the status report to indicate whether the continuous loss feedback information is included in the status report, so that the receiver can determine whether to include continuous loss feedback information according to the information.

The scheme of the present invention will be described in detail below by way of a few examples.

Embodiment 1: NACK_SN+Num (that is, including the number of one SN and PDU).

As shown in FIG. 2, it is assumed that the receiving state of the receiving device is: the SN of the last received PDU is 38, and 15 consecutive PDUs of the SN within the range of [12, 26] are lost, and the others are normally received.

When the loss is judged, the receiving sequence and the sending sequence are inconsistent due to the retransmission of the HARQ. Generally, the reordering timer needs to be detected. The length of the reordering timer is generally HARQ retransmission. Maximum delay. In this example, the transmitting device may transmit consecutive 12 PDUs of data packet SN from 0 to 11 at the first transmission moment, and 15 consecutive PDUs of data packet SN from 12 to 26 at the second transmission moment. A consecutive 12 PDUs of data packets SN from 27 to 38 are transmitted at the third transmission time.

For the receiving device, the first 12 PDUs of the SN from 0 to 11 are received first, and then 12 consecutive PDUs of the SN from 27 to 38 are received, and the receiving sequence gap is found in the middle, that is, the reordering timer is started, The length of the sorting timer is approximately equal to the maximum transmission delay of the HARQ. When the reordering timer expires and 15 PDUs at the gap are still not received, the 15 PDUs are determined to be lost. The status report needs to be fed back to the sending device to inform this. 15 PDUs are lost and need to be retransmitted by the sending device.

In the above case, it is necessary to carry the information that the SN loses the PDU from 12 to 26 in a status report, and also needs to carry as much information as possible that can be determined currently. One possible method is to carry the following in the status report:

1. Carrying an ACK_SN, which may be the highest SN information of the PDU that can currently determine the receiving state or the information of the next SN of the highest SN. In this example, the ACK_SN may be set to 38 or 39, and the sending device is informed that the SN=38 It has been received correctly, or the next SN that needs to be received is 39.

2. Carrying NACK_SN sequence information (ie, NACK_SN+Num), because the lost PDU is a continuous sequence, so the sequence can be carried together.

In this example, the NACK_SN can be set to 12 and carry NACK_NUM=15, indicating that 15 consecutive packets starting from SN=12 are lost, that is, the consecutive 15 PDUs of the SN range [12, 26] are lost;

Or it can carry NACK_SN set to 26, and carry NACK_NUM=15, in the format specification, it will be clearly indicated whether to adopt reverse order or sequential (if it is pre-agreed, it is clear in the format), so it can also be determined that the lost SN range is [ 12,26].

For the transmitting device, when receiving the status report, the receiving status of the receiving device can be accurately obtained from the ACK_SN information and the NACK_SN sequence information: the SN range is determined from the PDU of [12, 26], and the packet needs to be lost. Retransmission, the remaining packets before SN=38 are correctly received by the receiving device, the acknowledgment status of each PDU can be marked accordingly, and the sending window can be moved. For example, the lower boundary of the sending window can be updated from 0 to 12, 12 It is the first PDU that does not receive ACKs consecutively.

Embodiment 2: First_NACK_SN+Last_NACK_SN (ie including two SNs)

1. Carrying an ACK_SN, which may be the highest SN information of the PDU that can currently determine the receiving state or the information of the next SN of the highest SN. In this example, the ACK_SN may be set to 38 or 39, and the sending device is informed that the SN=38 Has been received correctly, or the next SN that needs to be received is 39;

2. Carrying NACK_SN sequence information (ie, First_NACK_SN+Last_NACK_SN), because the lost PDU is a continuous sequence, so the sequence can be carried together.

In this example, First_NACK_SN can be set to 12, and Last_NACK_SN is set to 26, and the missing SN range can be determined by these two values to be [12, 26], and a total of 15 consecutive PDUs are lost.

In this example, various inclusion relationships may be further extended by prior agreement or standard specification, such as (11, 27), (11, 26), [12, 27).

The square brackets represent numbers including edges, and the parentheses represent numbers that do not contain edges. Corresponding to the physical meaning, it may be the previous SN of continuous packet loss, or the next SN of consecutive packet loss. As long as the standard is defined so that the two ends understand the same, and the simple addition or subtraction of 1 operation, there will be no misunderstanding, but the representation is different, and the information carried is consistent.

For the transmitting device, when receiving the status report, the receiving status of the receiving device can be accurately obtained from the ACK_SN information, the First_NACK_SN, and the Last_NACK_SN information: the PDU whose SN range is from [12, 26] is determined to be lost. Retransmission is required, and the remaining data packets under SN=38 are correctly received by the receiving device. The acknowledgment status of each PDU can be marked accordingly, and the sending window can be moved. For example, the lower boundary of the sending window can be updated from 0 to 12. , 12 is the first PDU that does not continuously receive an ACK.

Embodiment 3: Instruction of a segmentation package

In the last two cases, the complete PDU reception or loss is given. In this example, it is the processing mode when the segmentation PDU needs to display its reception state.

As shown in FIG. 3, it is assumed that the receiving state of the receiving device is: the SN of the last received PDU is 38, and the transmitting device transmits the first 12 consecutive complete PDUs of the data packet SN from 0 to 12 and the SN at the first transmission moment. The first segment of the PDU of =12, for example the first 300 bytes, transmits 15 consecutive PDUs and PDU segments of the packet SN from 12 to 26 at the second transmission time, 13 complete PDUs SN of 13 to 25, 2 segmentation PDUs SN=12 and SN=26. The PDU with SN=12 sends the second and last segment of 300 bytes, and the PDU with SN=26 sends the first segment. The first 250 bytes are sent at the third transmission time. The packet SN is from 13 to 38 consecutive 13 PDUs and PDU segments. Among them, the PDU with SN=26 sends the second and last segment, followed by 500 bytes.

For the receiving device, the first 13 PDUs and PDU segments of the SN from 0 to 12 are received first, and then 13 consecutive PDUs and PDU segments of the SN from 26 to 38 are received, and a reception sequence gap exists in the middle. That is, the reordering timer is started, and the reordering timer length is approximately equal to the maximum transmission delay of the HARQ, and when the reordering timer expires, 15 PDUs and PDU segments at the gap are still not received, and the 15 PDUs are identified. If the PDU segment is lost, the status report needs to be sent back to the sending device to inform the 15 PDUs and the PDU segment is lost. The device needs to be retransmitted.

2. Carry the NACK_SN sequence and segmentation information.

When carrying consecutive PDU NACK_SN, the methods in the above two cases can be used. The key to this example is how the segmentation information is carried.

For the first NACK PDU, whether it is a segmentation packet can display an indication. When it is indicated that it is a segmentation packet, it may carry segmented SO (Segment Offset) information.

A general segmentation package requires two SO information, SOstart and SOend, or SOstart and break length. However, because the first PDU in the continuous PDU sequence, it must be the last segment, that is, SOend must be the end of the PDU, so the SOend information can be carried or omitted, that is, only SOstart=300 words need to be carried in this example. Section.

For the last PDU of a consecutive PDU, it can also be displayed to indicate whether it is a fragmentation packet. If it is a fragmentation package, it also needs SOstart and SOend, or SOstart and break length. Since the segmentation of the last PDU must be the first segment, that is, SOstart=0, SOstart can be carried or omitted, that is, only SOend=250 bytes need to be carried in this example.

For the transmitting device, when receiving the status report, the receiving status of the receiving device can be accurately obtained from the ACK_SN information and the NACK_SN sequence and the segmentation information: the SN range is determined from the PDU of [13, 25]. Packet, the last 300 bytes of SN=12 are lost, the first 250 bytes of SN=26 are lost, need to be retransmitted, and the remaining packets and segments under SN=38 are correctly received by the receiving device, The acknowledgment status of each PDU is marked accordingly, and the transmission window is moved. For example, the lower boundary of the transmission window can be updated from 0 to 12, and 12 is the first PDU that does not continuously receive an ACK.

Example 4: Mixing situation.

In the process of actual transmission, various packet loss states may be encountered. The main scenarios include the following various situations and any combination:

Only one complete PDU is lost;

Only one segment PDU is lost;

Continuous N complete PDUs are lost;

Continuous N PDUs and segments are lost, the first one is a fragmented packet, and the rest are complete PDUs;

N consecutive PDUs and segments are lost, the last one being a fragmented packet, and the rest being a complete PDU;

Successive N PDUs and segments are lost, with the first and last being fragmented packets and the rest being complete PDUs.

In order to effectively saturate the above situation, a feasible status report format is shown in FIG.

The D/C domain and the PDU type field are consistent with the original status report, and are not shown in the figure. D/C indicates that this is a control PDU; the PDU type field can indicate that this is a Status report. In the LTE protocol, D/C is a type indication to indicate whether the PDU is a data PDU or a control PDU. The PDU type is a type indication of the control PDU, and may indicate a status report or other control PDU format.

ACK_SN: is the highest SN capable of confirming the reception status, or the next SN of the highest SN; the size of this field is determined by the length of the SN used by the RLC entity. For example, if a SN of 12 bits or 18 bits is used, the corresponding length of the ACK_SN is consistent with the SN length.

En: It can be 1 bit length to indicate whether the NACK_SN related information is followed. For example, 0 indicates that the status report ends, and 1 indicates that there is NACK_SN related information.

NACK_SN: may be the SN of a single lost PDU; may also be the SN information of the first and/or last PDU of consecutively lost PDUs; or may be the SN and / of the first one of consecutively lost PDUs Or the last SN of the last one, such as Embodiment 2 above.

Ec: Can be 1 bit length, indicating whether it is a single PDU or a continuous PDU loss information, for example, 0 is a single PDU loss information, and 1 is a continuous PDU loss information.

Es1: It can be 1 bit length, indicating whether the lost PDU is a segment. If it is a single lost PDU, the information is sufficient. For example, 0 is a complete PDU loss, meaning that there will be no SO information in the future, and 1 is a segment PDU loss. , meaning that there will be SOstart and SOend in the future; if there are consecutive PDUs lost, the domain has two usages:

- Usage 1: Es1 only needs this field to indicate whether the consecutive PDUs contain segmentation information, that is, the first PDU and the last PDU are not distinguished, and the 1bit indication is used uniformly. When the bit is 0, the first PDU and the last PDU are not segmented; when the bit is taken to be 1, the first PDU and/or the last PDU are segmented. There are three cases: Only the first one is a segmentation PDU, only the last one is a segmentation PDU, the first and last one are simultaneously segmentation PDUs. In the case where only one domain of Es1 is required, the subsequent Es2 domain is not required, and the two domains of SOstart and SOend appear simultaneously, and SOstart corresponds to the position of the segment of the first PDU in the original complete PDU, and if segmentation, Taking a specific segment value, such as SOstart=300, means that the first PDU is lost from the 300th byte to the end of the segment. When the first PDU is completely lost, SOstart=0 can be expressed. SOend corresponds to the position of the last PDU segment in the original complete PDU. If segmentation, the specific segment value is taken, for example, SOend=250, meaning that the first 250 bytes of the last PDU are lost, when the last PDU is not divided. When the segment is lost, the SOend can be set to the maximum value of all 1s, indicating that it points to the end of the PDU. The format can be changed to the format shown in Figure 5:

- Usage 2: Es1 field, as an indication of whether the first PDU is fragmented, that is, when the Ec field shows that this is a format in which consecutive PDUs are lost, then the Es1 field only indicates whether the subsequent SOstart is present, and whether the last PDU is segmented. Indicated by another Es2 field, that is, whether SOend appears or not is indicated by Es2.

NACK_NUM: The number of consecutively lost PDUs, together with the NACK_SN field, determines the range of SNs of consecutively lost PDUs, or this field can also be changed to Last_NACK_SN, which is the first and last SN values of the SN of consecutively lost PDUs, respectively. This field only appears when Ec shows that this is a continuous loss of PDU format, and does not appear in the case of a single loss.

Es2: Used in conjunction with Es1, in case Ec indicates that this is a continuous loss PDU format, it is used to indicate whether the last PDU is segmented, or in the case of no optimization, only Es1 one domain is required.

SOstart: indicates the starting byte number of the PDU segment in the original full PDU in the case of a single PDU segment loss; in the format of the consecutive PDU, the segment indicating the first PDU is in the original full PDU The number of starting bytes in the first PDU segment must be the last segment, so the first PDU can omit SOend, the default to the end, of course, can also show that carrying SOend, equivalent to losing in consecutive PDUs In the case, there are two groups of SOstart+SOend, which correspond to the first packet and the last packet respectively; the complete segmentation information format of the two groups is shown in Fig. 6.

SOend: indicates the number of ending bytes of the PDU segment in the original full PDU in the case of a single PDU segment loss; in the format of the consecutive PDU, the segment indicating the last PDU is in the original full PDU The starting byte count, because the last PDU segment must be the first segment, so the last PDU can omit SOstart, starting with 0 bytes by default.

For example, in Figure 3, a serially lost packet, 26 is the last packet, and 26 is segmented, then the first segment of 26 that is included in the continuous SN (0-250 bytes) One segment).

In general, starting from 0 bytes is the first segment; starting from the middle byte and not ending, is the intermediate segment; starting from the middle byte and ending at the end of the segment coincides with the end of the PDU, is the last one Segmentation.

The following is an example of the format of FIG. 4, and other formats are similar, and details are not described herein again.

- When the status report contains only ACK information, and there is no packet loss information, the status report only needs to include ACK_SN information, and the following En field is set to 0, which means that the status report ends, and there is no NACK information subsequently.

- When the status report contains ACK information and a single complete PDU packet loss information, after the ACK_SN field is set to the corresponding value, the En field is set to 1, meaning that there is subsequent NACK information, then carries NACK_SN information, and the Ec domain is Set to 0, Es1 is set to 0, indicating that a single complete packet is lost. If it is a single fragmented packet, Ec=0, Es1=1, and carry SOstart and SOend. If more than one packet is lost, the subsequent En domain continues to be set. If 1, continue to carry the next NACK_SN information and the corresponding Ec domain and Es1 and possible segments until all are carried, setting the immediately following En field to 0, which means the status report ends.

- When the status report contains ACK information and consecutive PDU or segmented packet loss information, after the ACK_SN field is set to the corresponding value, the En field is set to 1, meaning that there is subsequent NACK information, and then carries the NACK_SN information, and The Ec field is set to 1, Es1 is set to 0, indicating continuous packet loss, and the NACK_NUM value is set. If it is continuous and there are segment packets, Ec=1, Es1=1, and carry SOstart and SOend, or Es1 indication. Whether SOstart appears, and Es2 indicates whether SOend appears. If there is more than one packet loss sequence, the subsequent En field continues to be set to 1, and continues to carry the next NACK_SN information and the corresponding Ec domain and Es1 and possible segments until all are carried. , sets the immediately following En field to 0, which means the status report ends.

- When the status report contains ACK information, and there is a single PDU or segmented packet loss information, as well as continuous PDU or segmented packet loss information, each time the En field is set to 1, the subsequent NACK information can carry a single The packet may also be a continuous packet, and the segmentation information is indicated by each, and the different information is carried one by one and the corresponding indication domain is set, until all are carried, and the following En domain is set to 0, meaning the status report End.

As shown in FIG. 7, the first receiving device of the embodiment of the present invention includes:

The information determining module 700 is configured to determine continuous loss feedback information corresponding to the lost PDU for any piece of lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the lost PDU. SN of all PDUs;

The sending module 701 is configured to send a status report of the continuous loss feedback information corresponding to the at least one segment lost PDU to the sending device, so that the sending device determines the PDU with the corresponding segment loss according to the continuous loss feedback information.

Optionally, the continuous loss feedback information includes the SN of one PDU and the number of PDUs lost in the corresponding segment; or

The SN of the two PDUs is included in the continuous loss feedback information.

Optionally, if the SN of the one PDU is the SN of the first PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the first PDU or does not include the first PDU; or

If the SN of the one PDU is the SN of the last PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the last PDU or does not include the last PDU; or

If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment; or

If the SN of the one PDU is the SN of the PDU that is located next to the PDU that is adjacent to the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.

Optionally, the SN of the two PDUs included in the continuous loss feedback information is the SN of the first PDU and the SN of the last PDU in the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the PDU and the SN of the last PDU that are located in front of the PDU that is adjacent to the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU in the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SNs of the PDUs located in front of the PDUs adjacent to the PDUs that are lost in the corresponding segment, and the SNs of the PDUs that are located later and adjacent to the PDUs that are lost in the corresponding segment.

Optionally, if the segment loss PDU includes a segment PDU, the continuous loss feedback information further includes segment segment information corresponding to the segment PDU, so that the sending device determines that the segment PDU is lost according to the segment offset information. byte.

Optionally, if the segment PDU is the first PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information used to determine the received success byte in the first PDU or is used to determine the first PDU. Information about missing bytes in the PDU; or,

If the segment PDU is the last PDU in the PDU of the corresponding segment loss, the segment offset information includes information for determining a success byte in the last PDU or information for determining a missing byte in the last PDU. ;or,

If the segment PDU is the first PDU and the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information for determining a success byte in the first PDU or is used to determine the first one. The information of the missing bytes in the PDU, as well as information for determining the success byte received in the last PDU or for determining the missing byte in the last PDU.

Optionally, the continuous loss feedback information further includes some or all of the following information:

Information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost.

Optionally, the status report further includes information used to indicate whether the continuous loss feedback information is included in the status report.

As shown in FIG. 8, the first sending device of the embodiment of the present invention includes:

The receiving module 800 is configured to receive, by the receiving device, a status report that includes continuous loss feedback information corresponding to at least one segment lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the segment lost SN of all PDUs in the PDU;

The processing module 801 is configured to determine, according to the continuous loss feedback information, at least one segment lost PDU.

The SN of the two PDUs is included in the continuous loss feedback information.

As shown in FIG. 9, the second receiving device of the embodiment of the present invention includes:

The processor 901 is configured to send and receive data through the transceiver 902, and read the program in the memory 904, and perform the following process:

Determining continuous loss feedback information corresponding to the lost PDU for any PDU that is lost, wherein the continuous loss feedback information includes an SN of at least one PDU, and does not include an SN of all PDUs in the lost PDU; A status report including continuous loss feedback information corresponding to the at least one segment lost PDU is sent to the transmitting device, so that the sending device determines the PDU with the corresponding segment loss according to the continuous loss feedback information.

The transceiver 902 is configured to receive and transmit data under the control of the processor 901.

The SN of the two PDUs is included in the continuous loss feedback information.

The interaction between the processor 901 and the terminal is performed by the transceiver 902.

In FIG. 9, a bus architecture (represented by bus 900), bus 900 can include any number of interconnected buses and bridges, and bus 900 will include one or more processors represented by processor 901 and memory represented by memory 904. The various circuits are linked together. The bus 900 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. Bus interface 903 provides an interface between bus 900 and transceiver 902. Transceiver 902 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. The data processed by the processor 901 is transmitted over the wireless medium via the antenna 905. Further, the antenna 905 also receives the data and transmits the data to the processor 901.

The processor 901 is responsible for managing the bus 900 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 904 can be used to store data used by the processor 901 in performing operations.

Optionally, the processor 901 may be a CPU (Central Embedded Device), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device). , complex programmable logic devices).

As shown in FIG. 10, the second sending device of the embodiment of the present invention includes:

The processor 1001 is configured to send and receive data through the transceiver 1002, and read the program in the memory 1004, and perform the following process:

Receiving a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, wherein the consecutive loss feedback information includes an SN of at least one PDU, and does not include an SN of all PDUs in the lost PDU Determining at least one segment lost PDU according to the continuous loss feedback information.

The transceiver 1002 is configured to receive and transmit data under the control of the processor 1001.

The SN of the two PDUs is included in the continuous loss feedback information.

If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all PDUs that are lost in the corresponding segment; or

The interaction between the processor 1001 and the terminal is performed by the transceiver 1002.

In FIG. 10, a bus architecture (represented by bus 1000), bus 1000 may include any number of interconnected buses and bridges, and bus 1000 will include one or more processors represented by processor 1001 and memory represented by memory 1004. The various circuits are linked together. The bus 1000 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. Bus interface 1003 provides an interface between bus 1000 and transceiver 1002. The transceiver 1002 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. The data processed by the processor 1001 is transmitted over the wireless medium via the antenna 1005. Further, the antenna 1005 also receives the data and transmits the data to the processor 1001.

The processor 1001 is responsible for managing the bus 1000 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 1004 can be used to store data used by the processor 1001 in performing operations.

Optionally, the processor 1001 may be a CPU, an ASIC, an FPGA, or a CPLD.

Based on the same inventive concept, a method for performing feedback is provided in the embodiment of the present invention. The device corresponding to the method is a device in the system that is fed back by the embodiment of the present invention, and the principle of the method for solving the problem is similar to the system. Therefore, the implementation of the method can be referred to the implementation of the system, and the repeated description will not be repeated.

As shown in FIG. 11, the first method for performing feedback in the embodiment of the present invention includes:

Step 1100: For any PDU that is lost, the receiving device determines continuous loss feedback information corresponding to the lost PDU, where the continuous loss feedback information includes the SN of at least one PDU, and does not include all the lost PDUs. SN of the PDU;

Step 1101: The receiving device sends a status report of the continuous loss feedback information corresponding to the at least one segment lost PDU to the sending device, so that the sending device determines the PDU with the corresponding segment loss according to the continuous loss feedback information.

The SN of the two PDUs is included in the continuous loss feedback information.

The embodiment of the present invention also protects a memory that stores a program for performing the method of feedback in FIG. 11 of the embodiment of the present invention. After the memory is connected to other devices, the program in the memory can be executed by processing in other devices, thereby implementing the solution of the embodiment of the present invention.

The way the memory is connected to other devices can be connected through an external interface or an internal interface. For example, the memory is a U disk, a mobile hard disk, etc., and can be connected through an external interface; for example, the memory is a storage module in other devices, and can be connected through an internal interface.

As shown in FIG. 12, the second method for performing feedback in the embodiment of the present invention includes:

Step 1200: The sending device receives, by the receiving device, a status report of continuous loss feedback information corresponding to the at least one segment lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the lost PDU. SN of all PDUs;

Step 1201: The sending device determines, according to the continuous loss feedback information, at least one segment lost PDU.

The SN of the two PDUs is included in the continuous loss feedback information.

Information indicating whether there is a segmentation PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost.

The embodiment of the present invention also protects a memory that stores a program for performing the method of feedback in FIG. 12 of the embodiment of the present invention. After the memory is connected to other devices, the program in the memory can be executed by processing in other devices, thereby implementing the solution of the embodiment of the present invention.

The present application has been described above with reference to block diagrams and/or flowchart illustrations of a method, apparatus (system) and/or computer program product according to embodiments of the present application. It will be understood that one block of the block diagrams and/or flowchart illustrations and combinations of blocks of the block diagrams and/or flowchart illustrations can be implemented by computer program instructions. These computer program instructions may be provided to a general purpose computer, a processor of a special purpose computer, and/or other programmable data processing apparatus to produce a machine such that instructions for execution via a computer processor and/or other programmable data processing apparatus are created for A method of implementing the functions/actions specified in the block diagrams and/or flowchart blocks.

Accordingly, the application can also be implemented in hardware and/or software (including firmware, resident software, microcode, etc.). Still further, the application can take the form of a computer program product on a computer usable or computer readable storage medium having computer usable or computer readable program code embodied in a medium for use by an instruction execution system or Used in conjunction with the instruction execution system. In the context of the present application, a computer usable or computer readable medium can be any medium that can contain, store, communicate, communicate, or transport a program for use by an instruction execution system, apparatus or device, or in conjunction with an instruction execution system, Used by the device or device.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method for performing feedback, characterized in that the method comprises:

For any piece of the lost protocol data unit PDU, the receiving device determines the continuous loss feedback information corresponding to the lost PDU, wherein the continuous loss feedback information includes the SN of at least one PDU, and does not include all of the lost PDUs. Serial number SN of the PDU;

The receiving device sends a status report of the continuous loss feedback information corresponding to the at least one segment lost PDU to the sending device, so that the sending device determines the corresponding segment lost PDU according to the continuous loss feedback information.
The method according to claim 1, wherein the continuous loss feedback information includes the number of SNs of one PDU and the number of PDUs lost in the corresponding segment; or

The SN of the two PDUs is included in the continuous loss feedback information.
The method according to claim 2, wherein if the SN of the one PDU is the SN of the first PDU in the PDU that is lost in the segment, the number of PDUs lost in the corresponding segment includes the first PDU or does not include The first PDU; or,

If the SN of the one PDU is the SN of the last PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the last PDU or does not include the last PDU; or

If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment; or

If the SN of the one PDU is the SN of the PDU that is located next to the PDU that is adjacent to the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.
The method according to claim 2, wherein the SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU and the SN of the last PDU in the PDU of the corresponding segment loss; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the PDU and the SN of the last PDU that are located in front of the PDU that is adjacent to the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU in the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SNs of the PDUs located in front of the PDUs adjacent to the PDUs that are lost in the corresponding segment, and the SNs of the PDUs that are located later and adjacent to the PDUs that are lost in the corresponding segment.
The method according to any one of claims 2 to 4, wherein if the segment lost PDU comprises a segment PDU, the continuous loss feedback information further includes segment segment information corresponding to the segment PDU, so that the The transmitting device determines the missing bytes in the segmentation PDU based on the segment offset information.
The method according to claim 5, wherein if the segment PDU is the first PDU in the PDU of the corresponding segment loss, the segment offset information includes a success byte for determining the first PDU. Information or information used to determine missing bytes in the first PDU; or,

If the segment PDU is the last PDU in the PDU of the corresponding segment loss, the segment offset information includes information for determining a success byte in the last PDU or information for determining a missing byte in the last PDU. ;or,

If the segment PDU is the first PDU and the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information for determining a success byte in the first PDU or is used to determine the first one. The information of the missing bytes in the PDU, as well as information for determining the success byte received in the last PDU or for determining the missing byte in the last PDU.
The method according to claim 5 or 6, wherein the continuous loss feedback information further comprises part or all of the following information:

Information indicating whether the first PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether the last PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost.
The method according to claim 7, wherein the information indicating whether the first PDU of the PDU lost in the corresponding segment is a segmentation PDU is located in a segment indication field of the status report; or

The information indicating whether the last PDU in the PDU lost in the corresponding segment is a segment PDU is located in a segment indication field of the status report; or

The information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost is located in the segment indication field of the status report.
The method according to any one of claims 1 to 4, wherein the status report further includes information for indicating whether the continuous loss feedback information is included in the status report.
A method for performing feedback, characterized in that the method comprises:

The sending device receives a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include all PDUs in the lost PDU SN;

The transmitting device determines at least one segment lost PDU according to the continuous loss feedback information.
The method according to claim 10, wherein the continuous loss feedback information includes the number of SNs of one PDU and the number of PDUs lost in the corresponding segment; or

The SN of the two PDUs is included in the continuous loss feedback information.
The method according to claim 11, wherein if the SN of the one PDU is the SN of the first PDU in the PDU that is lost in the segment, the number of PDUs lost in the corresponding segment includes the first PDU or not included. The first PDU; or,

If the SN of the one PDU is the SN of the last PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the last PDU or does not include the last PDU; or

If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment; or

If the SN of the one PDU is the SN of the PDU that is located next to the PDU that is adjacent to the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.
The method according to claim 11, wherein the SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU and the SN of the last PDU in the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the PDU and the SN of the last PDU that are located in front of the PDU that is adjacent to the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU in the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SNs of the PDUs located in front of the PDUs adjacent to the PDUs that are lost in the corresponding segment, and the SNs of the PDUs that are located later and adjacent to the PDUs that are lost in the corresponding segment.
The method according to any one of claims 11 to 13, wherein if the segment lost PDU comprises a segment PDU, the continuous loss feedback information further includes segment segment information corresponding to the segment PDU, so that the The transmitting device determines the missing bytes in the segmentation PDU based on the segment offset information.
The method according to claim 14, wherein if the segment PDU is the first PDU in the PDU of the corresponding segment loss, the segment offset information includes a success byte for determining the first PDU. Information or information used to determine missing bytes in the first PDU; or,

If the segment PDU is the last PDU in the PDU of the corresponding segment loss, the segment offset information includes information for determining a success byte in the last PDU or information for determining a missing byte in the last PDU. ;or,

If the segment PDU is the first PDU and the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information for determining a success byte in the first PDU or is used to determine the first one. The information of the missing bytes in the PDU, as well as information for determining the success byte received in the last PDU or for determining the missing byte in the last PDU.
The method according to claim 14 or 15, wherein the continuous loss feedback information further includes some or all of the following information:

Information indicating whether the first PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether the last PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost.
The method according to claim 16, wherein the information indicating whether the first PDU of the PDU in which the corresponding segment is lost is a segmentation PDU is located in a segment indication field of the status report; or

The information indicating whether the last PDU in the PDU lost in the corresponding segment is a segment PDU is located in a segment indication field of the status report; or

The information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost is located in the segment indication field of the status report.
The method according to any one of claims 10 to 13, wherein the status report further includes information for indicating whether the continuous loss feedback information is included in the status report.
A receiving device, comprising:

A processor for transmitting and receiving data through the transceiver and reading the program in the memory, performing the following process:

Determining continuous loss feedback information corresponding to the lost PDU for any PDU that is lost, wherein the continuous loss feedback information includes an SN of at least one PDU, and does not include an SN of all PDUs in the lost PDU; And sending, by the sending device, a status report that includes the consecutive lost feedback information corresponding to the missing PDU of the segment to the sending device, so that the sending device determines, according to the continuous loss feedback information, the PDU with the corresponding segment loss;

A transceiver for receiving and transmitting data under the control of a processor.
The receiving device according to claim 19, wherein the continuous loss feedback information includes an SN of one PDU and a number of PDUs lost in a corresponding segment; or

The SN of the two PDUs is included in the continuous loss feedback information.
The receiving device according to claim 20, wherein if the SN of the one PDU is the SN of the first PDU in the PDU that is lost in the segment, the number of PDUs lost in the corresponding segment includes the first PDU or not Including the first PDU; or,

If the SN of the one PDU is the SN of the last PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the last PDU or does not include the last PDU; or

If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment; or

If the SN of the one PDU is the SN of the PDU that is located next to the PDU that is adjacent to the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.
The receiving device according to claim 20, wherein the SN of the two PDUs included in the continuous loss feedback information is the SN of the first PDU and the SN of the last PDU in the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the PDU and the SN of the last PDU that are located in front of the PDU that is adjacent to the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU in the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SNs of the PDUs located in front of the PDUs adjacent to the PDUs that are lost in the corresponding segment, and the SNs of the PDUs that are located later and adjacent to the PDUs that are lost in the corresponding segment.
The receiving device according to any one of claims 20 to 22, wherein if the PDU with a segment loss includes a segment PDU, the continuous loss feedback information further includes segment offset information corresponding to the segment PDU, so as to The transmitting device determines the missing bytes in the segmentation PDU based on the segment offset information.
The receiving device according to claim 23, wherein if the segment PDU is the first PDU in the PDU that is missing from the segment, the segment offset information includes a success word for determining the first PDU. Section information or information used to determine missing bytes in the first PDU; or,

If the segment PDU is the last PDU in the PDU of the corresponding segment loss, the segment offset information includes information for determining a success byte in the last PDU or information for determining a missing byte in the last PDU. ;or,

If the segment PDU is the first PDU and the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information for determining a success byte in the first PDU or is used to determine the first one. The information of the missing bytes in the PDU, as well as information for determining the success byte received in the last PDU or for determining the missing byte in the last PDU.
The receiving device according to claim 23 or 24, wherein the continuous loss feedback information further includes some or all of the following information:

Information indicating whether the first PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether the last PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost.
The receiving device according to claim 25, wherein the information indicating whether the first PDU of the PDU lost in the corresponding segment is a segmentation PDU is located in a segment indication field of the status report; or ,

The information indicating whether the last PDU in the PDU lost in the corresponding segment is a segment PDU is located in a segment indication field of the status report; or

The information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost is located in the segment indication field of the status report.
The receiving device according to any one of claims 19 to 22, wherein the status report further includes information for indicating whether the continuous loss feedback information is included in the status report.
A transmitting device, comprising:

A processor for transmitting and receiving data through the transceiver and reading the program in the memory, performing the following process:

Receiving a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, wherein the consecutive loss feedback information includes an SN of at least one PDU, and does not include an SN of all PDUs in the lost PDU Determining at least one segment lost PDU according to the continuous loss feedback information;

A transceiver for receiving and transmitting data under the control of a processor.
The transmitting device according to claim 28, wherein the continuous loss feedback information includes an SN of one PDU and a number of PDUs lost in a corresponding segment; or

The SN of the two PDUs is included in the continuous loss feedback information.
The transmitting device according to claim 29, wherein if the SN of the one PDU is the SN of the first PDU in the PDU that is lost in the segment, the number of PDUs lost in the corresponding segment includes the first PDU or not Including the first PDU; or,

If the SN of the one PDU is the SN of the last PDU in the PDU that is lost in the corresponding segment, the number of PDUs lost in the corresponding segment includes the last PDU or does not include the last PDU; or

If the SN of the PDU is the SN of the PDU that is located in front and is adjacent to the PDU that is lost in the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment; or

If the SN of the one PDU is the SN of the PDU that is located next to the PDU that is adjacent to the corresponding segment, the number of PDUs that are lost in the corresponding segment includes all the PDUs that are lost in the corresponding segment.
The transmitting device according to claim 29, wherein the SN of the two PDUs included in the continuous loss feedback information is the SN of the first PDU and the SN of the last PDU in the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the PDU and the SN of the last PDU that are located in front of the PDU that is adjacent to the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SN of the first PDU in the PDU that is lost in the corresponding segment, and the SN of the PDU that is located later and adjacent to the PDU that is lost in the corresponding segment; or

The SNs of the two PDUs included in the continuous loss feedback information are the SNs of the PDUs located in front of the PDUs adjacent to the PDUs that are lost in the corresponding segment, and the SNs of the PDUs that are located later and adjacent to the PDUs that are lost in the corresponding segment.
The transmitting device according to any one of claims 29 to 31, wherein if the segment lost PDU comprises a segment PDU, the continuous loss feedback information further includes segment segment information corresponding to the segment PDU, so as to The transmitting device determines the missing bytes in the segmentation PDU based on the segment offset information.
The transmitting device according to claim 32, wherein if the segment PDU is the first PDU in the PDU that is missing from the segment, the segment offset information includes a success word for determining the first PDU. Section information or information used to determine missing bytes in the first PDU; or,

If the segment PDU is the last PDU in the PDU of the corresponding segment loss, the segment offset information includes information for determining a success byte in the last PDU or information for determining a missing byte in the last PDU. ;or,

If the segment PDU is the first PDU and the last PDU in the PDU that is lost in the corresponding segment, the segment offset information includes information for determining a success byte in the first PDU or is used to determine the first one. The information of the missing bytes in the PDU, as well as information for determining the success byte received in the last PDU or for determining the missing byte in the last PDU.
The transmitting device according to claim 32 or 33, wherein the continuous loss feedback information further includes some or all of the following information:

Information indicating whether the first PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether the last PDU in the PDU in which the corresponding segment is lost is a segment PDU;

Information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost.
The transmitting device according to claim 34, wherein the information indicating whether the first PDU of the PDU lost in the corresponding segment is a segment PDU is located in a segment indication field of the status report; or ,

The information indicating whether the last PDU in the PDU lost in the corresponding segment is a segment PDU is located in a segment indication field of the status report; or

The information indicating whether there is a segment PDU in the first PDU and the last PDU in the PDU in which the corresponding segment is lost is located in the segment indication field of the status report.
The transmitting device according to any one of claims 28 to 31, wherein the status report further includes information for indicating whether the continuous loss feedback information is included in the status report.
A receiving device for performing feedback, characterized in that the receiving device comprises:

An information determining module, configured to determine continuous loss feedback information corresponding to the lost PDU for any piece of lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the lost PDU in the segment SN of all PDUs;

And a sending module, configured to send, to the sending device, a status report that includes continuous loss feedback information corresponding to the at least one segment lost PDU, so that the sending device determines, according to the continuous loss feedback information, the corresponding segment lost PDU.
A transmitting device for performing feedback, characterized in that the sending device comprises:

a receiving module, configured to receive a status report from the receiving device that includes continuous loss feedback information corresponding to at least one segment lost PDU, where the continuous loss feedback information includes an SN of at least one PDU, and does not include the lost PDU SN of all PDUs;

And a processing module, configured to determine, according to the continuous loss feedback information, at least one segment lost PDU.