CN113473532B

CN113473532B - Method and system for optimally transmitting radio link control state report

Info

Publication number: CN113473532B
Application number: CN202110724841.7A
Authority: CN
Inventors: 戴利琼; 胡立华; 程潮; 冯伟
Original assignee: CICT Mobile Communication Technology Co Ltd
Current assignee: CICT Mobile Communication Technology Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-04-19
Anticipated expiration: 2041-06-29
Also published as: CN113473532A

Abstract

The invention provides a method and a system for optimally transmitting a radio link control state report, which comprises the following steps: acquiring an original report field set in a state report format of an NR RLC protocol; adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a segment offset position group number indication field of the middle fragment to obtain an updated report field set; and fragmenting the missing part in the RLC data based on the updated report field set, and outputting an RLC transmission status report. The invention adds new indication field in the prior NR RLC protocol, so that the wireless link control layer does not need to carry all field information when reporting the transmission state of the lost fragment, thereby greatly reducing the overhead of the state report under the condition of indicating the lost fragment, and simultaneously effectively reducing the sending times of the state report under the condition of insufficient cache of the MAC sending state report, thereby reducing the feedback time delay of the state report.

Description

Method and system for optimally transmitting radio link control state report

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for optimal transmission of a radio link control status report.

Background

In a new-generation Radio (NR) Protocol, a Radio Link Control (RLC) layer is located between a Packet Data Convergence Protocol (PDCP) layer and a Media Access Control (MAC) layer. In the Data sending entity, the RLC Protocol layer forms an RLC Service Data Unit (Service Data Unit, SDU) to a PDCP Protocol Data Unit (PDU) transferred from the PDCP layer according to a scheduling result of the MAC layer on a corresponding logical channel, adds an RLC header to the RLC Service Data Unit (Service Data Unit, SDU) and encapsulates the RLC Service Data Unit (Service Data Unit, SDU) into an RLC Data PDU or segments the RLC Service Data Unit (Service Data Unit, SDU) into a new RLC SDU, adds the RLC header to encapsulate the new RLC Service Data PDU into an RLC Data PDU, and sends the RLC Data PDU to the MAC layer. When the RLC layer is configured in an (Acknowledged Mode, AM) Mode, the data receiving entity sends an RLC status report to the data sending entity according to a receiving condition of RLC SDUs of the data sending entity, so as to confirm currently and correctly received RLC SDUs or RLC SDU fragments and missing RLC SDUs or RLC SDU fragments required to be retransmitted by the data receiving entity, and after receiving the status report sent by the data receiving entity, the data sending entity retransmits the RLC SDUs or RLC SDU fragments which are not successfully received by the data receiving entity according to contents indicated by the status report, so as to achieve reliable data transmission.

In order to enable the sending-side RLC entity to correctly retransmit a missing RLC SDU or RLC SDU fragment, the receiving-side RLC entity needs to carry a Sequence Number (SN) identifier of each missing RLC SDU when assembling a status report, and also needs to carry a Segment Offset start position (start) and a Segment Offset end position (end) of each RLC SDU fragment relative to an original complete RLC SDU for each missing RLC SDU fragment. According to 3GPP technical specification TS38.322 V16.1.0, each SN is 12bits or 18bits long, each SOstart is 2 bytes long, and each SOend is 2 bytes long, so that the overhead of status reporting is large in case of RLC SDU fragment loss.

The technical problem to be solved by the present invention is described below with reference to specific application scenarios. The format of the status report specified by the RLC protocol of NR is as shown in fig. 1(SN 12bits) and fig. 2(SN 18bits), and for each missing RLC SDU fragment, the receiving-side RLC entity needs to indicate in the status report a Negative Acknowledgement sequence number (NACK _ SN), a fragment offset start position SOstart, and a fragment offset end position soind of an unsuccessfully received RLC SDU fragment. Exemplarily, fig. 3 shows a case where a data receiving end receives RLC SDUs in a current RLC reception sliding window; fig. 4 shows a format of an RLC status report corresponding to the RLC SDU reception case. As shown in fig. 3, the RLC SDU with sequence number SN N +3 within the receiving entity receiving window loses 3 slices; as shown in fig. 4, the status report of RLC entity assembly at the receiving side indicates the NACK _ SN, start position of slice offset and end position of slice offset of all the RLC SDU slices that are not successfully received, and takes the sequence number SN of RLC SDU as 18bits as an example, indicating that the overhead occupied by each missing slice is 7 bytes (3 bytes NACK _ SN +2 bytes SOstart +2 bytes SOend) and the overhead occupied by all the slices is 21 bytes (overhead occupied by each slice is the number of missing slices). Obviously, when the AM receiving entity fails to receive multiple slices of the same RLC SDU, the status report of the current NR RLC protocol indicates per missing slice NACK _ SN + SOstart + SOend, resulting in NACK _ SN repeated indication multiple times. Furthermore, if the missing slice is located at the head of the RLC SDU (i.e., the slice contains the first byte of data of the original RLC SDU), the segmentation offset starting position SOstart with respect to the original RLC SDU is 0, so that only the segmentation offset ending position soind with respect to the original RLC SDU needs to be actually indicated, and the indication of SOstart is redundant; if the missing slice is located at the end of the RLC SDU (i.e. the slice contains the last byte of data of the original RLC SDU), the segmentation offset end position SOend relative to the original RLC SDU is known to the sending entity, so that in practice only an indication of the start byte offset address SOstart relative to the original RLC SDU needs to be indicated, the indication of SOend being redundant. Therefore, the above problems may cause the disadvantages of high RLC status report overhead, resource waste, and large feedback delay.

In view of the above problems, a new method for transmitting an optimized rlc status report needs to be provided.

Disclosure of Invention

The invention provides a method and a system for optimally transmitting a radio link control status report, which are used for overcoming the defects in the prior art.

In a first aspect, the present invention provides a method for optimized transmission of a radio link control status report, including:

acquiring an original report field set in a state report format of an NR RLC protocol;

based on the original report field set, adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a middle fragment segment offset position group number indication field to obtain an updated report field set;

and determining received RLC data, segmenting the missing RLC SDUs or RLC SDUs in the RLC data based on the updated report field set, and outputting an RLC transmission status report.

In a second aspect, the present invention further provides a radio link control status report optimized transmission system, including:

the acquisition module is used for acquiring an original report field set in an NR RLC protocol status report format;

the updating module is used for adding a fourth report field, a head fragment judgment indication field, a tail fragment judgment indication field and a middle fragment segmentation offset position group number indication field based on the original report field set to obtain an updated report field set;

and the output module is used for determining the received RLC data, segmenting the missing RLC SDU or RLC SDU in the RLC data based on the updated report field set and outputting an RLC transmission state report.

In a third aspect, the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the radio link control status report optimized transmission method according to any one of the above.

In a fourth aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the radio link control status report optimized transmission method as described in any of the above.

The method and the system for optimally transmitting the radio link control state report have the advantages that the new indication field is added in the existing NR RLC protocol, so that when the radio link control layer reports the transmission state of the lost fragment, the radio link control layer does not need to carry all field information, the overhead of the state report under the condition of indicating the lost fragment is greatly reduced, meanwhile, under the condition that the cache of the MAC sent state report is insufficient, the sending times of the state report can be effectively reduced, and the feedback delay of the state report is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 shows a status report format (SN 12bits) of the NR RLC protocol provided in the prior art;

fig. 2 is a status report format (SN is 18bits) of the NR RLC protocol provided by the prior art;

fig. 3 is a diagram illustrating an example of RLC SDU reception by a data receiving end at a current RLC reception sliding window according to the prior art;

fig. 4 is a diagram illustrating a status report format of RLC SDU received by a data receiving end in a current RLC reception sliding window according to the prior art;

fig. 5 is a flow chart of a method for optimally transmitting a rlc status report according to the present invention;

fig. 6 is a status report format (SN is 12bits) of the NR RLC protocol provided by the present invention;

fig. 7 is a status report format (SN is 18bits) of the NR RLC protocol provided by the present invention;

fig. 8 is one of exemplary diagrams of RLC SDU reception by the data receiving end at the current RLC reception sliding window provided by the present invention;

fig. 9 is a schematic diagram of a status report format of RLC SDU received by the data receiving end in the current RLC reception sliding window according to the present invention;

fig. 10 is a second exemplary diagram illustrating the RLC SDU reception by the data receiving end in the current RLC reception sliding window according to the present invention;

fig. 11 is a diagram illustrating a second status report format of RLC SDU received by the data receiving end in the current RLC reception sliding window according to the present invention;

fig. 12 is a schematic structural diagram of a radio link control status report optimized transmission system provided by the present invention;

fig. 13 is a schematic structural diagram of an electronic device provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Aiming at the problem of overlarge expense in the prior art, the invention provides a novel method and a system for optimizing transmission of a status report of a radio link control layer, which can effectively reduce the overhead of the status report under the condition of indicating the loss of fragments.

Fig. 5 is a schematic flowchart of a method for optimized transmission of a rlc status report according to the present invention, as shown in fig. 5, including:

s1, acquiring an original report field set in the NR RLC protocol status report format;

s2, based on the original report field set, adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a middle fragment offset position group number indication field to obtain an updated report field set;

s3, determining the received RLC data, based on the updated report field set, segmenting the missing RLC SDU or RLC SDU in the RLC data, and outputting an RLC transmission status report.

Specifically, the data receiving end constructs an RLC status report including a negative acknowledgement sequence number (NACK _ SN) field, a field (E4, i.e., a fourth report field) indicating whether NACK _ SN is followed by a field describing a case where NACK _ SN is missing slice, a SOend field (F, i.e., a header slice judgment indication field) indicating whether NACK _ SN is followed by a SOend field indicating a header slice, a field (L, i.e., a tail slice judgment indication field) indicating whether NACK _ SN is followed by a SOstart indicating a tail slice, a field (countdown, i.e., a Segment Offset position group number indication field of a middle slice) indicating the number of groups of the SOstart and SOend fields of the middle slice, a Segment Offset start position (Segment Offset start, start) and a Segment Offset end position (SOend) field; the data receiving end sends the RLC status report to the data transmitting end.

The invention realizes the flexible adjustment of the distribution and the value of E4, F, L, COUNT, SOstart and SOend according to the condition of the lost fragment, and effectively reduces the overhead of state report when the lost fragment is indicated.

Based on the above embodiment, step S1 in the method includes:

acquiring a PDU type indication field, a status report type indication field, a first report field, a second report field, a third report field, a reserved field, a response sequence number field, a negative response sequence number field, a segmentation offset starting position field, a segmentation offset ending position field and an unsuccessfully received RLC SDU number field

Determining that the first reporting field includes a subsequent determination indication of whether to accompany the negative acknowledgement sequence number field, the first reporting field, the second reporting field, and the third reporting field;

determining that the second reporting field includes a judged indication of whether the negative acknowledgement sequence number field is subsequently accompanied by the segment offset starting position field and the segment offset ending position field;

determining that the third report field includes a determination indication of whether the negative acknowledgement sequence number field is subsequently accompanied by the number of unsuccessfully received RLC SDUs field.

Specifically, the present invention requires obtaining a status report format of the existing NR RLC protocol, as shown in fig. 1 and 2, the status report includes D/C fields, CPT fields, E1 fields, E2 fields, E3 fields, R fields, ACK _ SN fields, NACK _ SN fields, SOstart, and SOend and NACK range fields, wherein the D/C fields indicate whether the RLC PDU is a control PDU or a data PDU, the CPT fields indicate the type of the status report, the correspondence between the values of the E1 fields and the indicated information is shown in table 1, the correspondence between the values of the E2 fields and the indicated information is shown in table 2, the correspondence between the values of the E3 fields and the indicated information is shown in table 3, the R fields are reserved fields, the ACK _ SN fields indicate the next RLC SDU to be received by the data receiving end, the SOstart fields are used to indicate the offset position of the first byte of data of the missing RLC SDU in the original RLC SDU, the SOend field is used to indicate the offset position of the last byte of data of the missing RLC SDU fragment in the original RLC SDU, and the NACK range field is used to indicate the number of RLC SDUs that the data receiving end has not successfully received, starting from and including NACK _ SN.

TABLE 1

TABLE 2

TABLE 3

Based on any of the above embodiments, the step S2 in the method includes:

determining that the first reporting field includes a determination indication of whether the negative acknowledgement sequence number field, the first reporting field, the second reporting field, the third reporting field, and the fourth reporting field are to follow;

determining whether the fourth report field includes a determination indication that the negative acknowledgement sequence number field is subsequently accompanied by the header fragment determination indication field, the tail fragment determination indication field, and a fragment offset location group number indication field of the middle fragment;

determining that the header fragmentation judgment indication field includes a judgment indication of whether the negative acknowledgement sequence number field is followed by the fragment offset starting position field;

determining that the tail fragmentation judgment indication field includes a judgment indication of whether the negative acknowledgement sequence number field is followed by the fragment offset end position field.

Specifically, based on the status report specified by the existing protocol, an E4 field, an F field, an L field, and a COUNT field are designed, and taking a typical scenario that the header fragment, the middle fragment, and the tail fragment of the same RLC SDU are all lost as an example, as shown in fig. 6 (SN is 12bits) and fig. 7 (SN is 18bits), where the E4 field uses the original reserved field R field, and the F field, the L field, and the COUNT field use the newly added Bit7, Bit6, and Bit5-Bit0 of 1 byte, respectively. The correspondence between the value of the E1 field and the indicated information is shown in table 4, the correspondence between the value of the E2 field and the indicated information is shown in table 5, the correspondence between the value of the E4 field and the indicated information is shown in table 6, the correspondence between the value of the F field and the indicated information is shown in table 7, the correspondence between the value of the L field and the indicated information is shown in table 8, and the COUNT field is used to indicate the number of groups of the S0start field and the soid field accompanying the middle slice after the NACK _ SN. The other fields are understood to be consistent with the status report of the standard protocol.

TABLE 4

TABLE 5

TABLE 6

TABLE 7

TABLE 8

Based on any of the above embodiments, step S3 in the method includes the following cases:

the first condition is as follows: when detecting that only the header slice of a certain RLC SDU is lost, the receiving entity sets NACK _ SN field, E4 field to 1, F field to 1, L field and COUNT field to 0, and soind field to the offset position of the last byte data of the header slice in the original RLC SDU in the status report. Note that the SOstart field of the header slice is removed here because it defaults to binary "0000000000000000" for the header slice.

In case two, when it is detected that only the tail segment of a certain RLC SDU is lost, the receiving entity sets NACK _ SN field, E4 field of 1, F field of 0, L field of 1, COUNT field of 0, and start field of offset position of the first byte data of the tail segment in the original RLC SDU in the status report. Note that the Soend field of the tail slice is removed here, since for the tail slice, the Soend field defaults to binary "1111111111111111".

In case three, when it is detected that only the middle slice of a certain RLC SDU is lost and the number of the lost middle slices is N (N is greater than or equal to 2 and N is less than or equal to 64), the receiving entity sets NACK _ SN field, E4 field as 1, F field as 0, L field as 0, COUNT field as the number N of the lost middle slices, N sets of SOstart field and soind field in the status report. For each intermediate slice, the SOstart field and the SOend field are offset positions of the first byte data and the last byte data of the missing slice in the original RLC SDU, respectively. Note that the SOstart field and the SOend field of the multi-group middle slice are sequentially placed in order from small to large.

In case four, when it is detected that both the header fragment and the tail fragment of a certain RLC SDU are lost, the receiving entity sets, in the status report, a NACK _ SN field, an E4 field of 1, an F field of 1, an L field of 1, a COUNT field of 0, a soind field of the offset position of the last byte data of the header fragment in the original RLC SDU, and a SOstart field of the offset position of the first byte data of the tail fragment in the original RLC SDU, respectively. Note that the SOend field of the head slice is placed first, and the SOstart field of the tail slice is placed later.

In case five, when it is detected that the header slice and N (N is 1 or more than 1, and N is 64 or less) middle slices of a certain RLC SDU are all lost, the receiving entity sets NACK _ SN field, E4 field, F field, L field, and COUNT field to 1, respectively, in the status report, sets the sock field to be the offset position of the last byte data in the original RLC SDU for the header slice, and sets a set of SOstart field and sock field to be the offset positions of the first byte data and last byte data of the lost slice, respectively, for each middle slice. Note that the SOend field of the header slice is placed first, and then the N-set SOstart field and the SOend field of the middle slice are placed in order from small to large.

In case six, when it is detected that the tail fragment and N (N is 1 or more than 1, and N is 64 or less) middle fragments of a certain RLC SDU are all lost, the receiving entity sets NACK _ SN field, E4 field, F field, L field, and COUNT field to 1 in the status report, respectively, sets the start field to be the offset position of the first byte data in the original RLC SDU for the tail fragment, and sets a set of start field and start field to be the offset positions of the first byte data and the last byte data in the original RLC SDU for each lost middle fragment. Note that the SOstart field and the SOstart field of the middle segment are placed in order from small to large, and then the SOstart field of the tail segment is placed.

In case seven, when it is detected that the header fragment, N (N is 1 or more than 1, and N is 64 or less) middle fragments and tail fragments of a certain RLC SDU are all lost, the receiving entity sets NACK _ SN field, E4 field, F field, L field, and COUNT field to N in the status report, sets the SOstart field for the header fragment as the offset position of the last byte data in the original RLC SDU, sets a set of SOstart field and SOstart field for each lost middle fragment as the offset position of the first byte data and the last byte data in the original RLC SDU, and sets the SOstart field for the tail fragment as the offset position of the first byte data in the original RLC SDU. Note that the SOstart field of the head slice is placed first, then the SOstart fields and the SOstart fields of the N groups of the middle slices are placed in order from small to large, and finally the SOstart field of the tail slice is placed.

In case eight, in particular, when it is detected that the middle fragment of a certain RLC SDU is lost and the number of the lost middle fragments is greater than 64, the status report is assembled according to the above case three (only the middle fragment is lost) or case five (the lost fragment includes the header fragment and the middle fragment) for the first 64 middle fragments, and the status report is assembled according to the above case three (only the middle fragment is the remaining lost fragment) or case six (the remaining lost fragment includes the middle fragment and the tail fragment) for the remaining middle fragments by re-indicating the negative acknowledgement sequence number NACK _ SN.

In particular, when it is detected that a certain RLC SDU is lost or only one middle fragment is lost, the receiving entity sets the E4 field to 0 in the status report, does not enable the F field, the L field, and the COUNT field, and constructs the status report as specified by the NR RLC protocol.

When the receiving entity detects that a certain RLC SDU header fragment is lost, the receiving entity only indicates the NACK _ SN domain, the F domain and the Soend domain in the status report, so that the cost of the Sostart domain can be saved; when the receiving entity detects that a certain RLC SDU tail fragment is lost, only a NACK _ SN domain, an L domain and a Sostart domain are indicated in the status report, so that the expense of the Soend domain can be saved; when the receiving entity detects that a certain RLC SDU has N fragments (N is more than or equal to 2) lost, the NACK domain is only indicated once, and the overhead of N-1 NACK domains can be saved. Therefore, the overhead of the status report under the condition of indicating the loss of the fragment can be greatly reduced, and meanwhile, under the condition that the buffer of the MAC sending status report is not enough, the sending times of the status report can be effectively reduced, so that the feedback time delay of the status report is reduced. Particularly, the method for optimizing the transmission of the status report is also suitable for the assembly of the status report of the RLC layer of the LTE protocol, and can effectively reduce the overhead of the status report under the condition of indicating the loss of the fragments.

Based on any of the above embodiments, the present invention specifically explains the proposed scheme in combination with a specific application scenario.

Fig. 8 shows the RLC SDU receiving condition of the data receiving end at the current RLC reception sliding window; the format of the RLC status report corresponding to the RLC SDU reception shown in fig. 8 is shown in fig. 9. In this example, as can be seen from fig. 8, the data receiving end detects that nine RLC SDUs with sequence numbers from N to N +8 are received in the current RLC reception sliding window, and four RLC data PDUs are missing as detected by the data receiving end, where the first segment is a header slice (byte offset position from 0 to 40) of the RLC SDU with sequence number N, the second segment is a tail slice (byte offset position from 115 to tail) of the RLC SDU with sequence number N +2, the third segment is a header slice (byte offset position from 0 to 38) of the RLC SDU with sequence number N +2, and the fourth segment is a tail slice (byte offset position from 123 to tail) of the RLC SDU with sequence number N + 4; the data receiving end correctly receives a middle fragment (byte offset position is from 41 to 114) of the RLC SDU with sequence number N, an RLC SDU with sequence number N +1, a tail fragment (byte offset position is from 39 to tail) of the RLC SDU with sequence number N +2, an RLC SDU with sequence number N +3, a head fragment (byte offset position is from 0 to 122) of the RLC SDU with sequence number N +4, and 4 RLC SDUs with sequence numbers N +5 to N + 8; the RLC SDU of N +9 is the next unreceived RLC SDU by the data receiving end. Correspondingly, in the RLC status report format diagram 9, for the case where the header fragment and the tail fragment with the sequence number N are lost, the data receiving end sets E4 to 1, and starts the subsequent F field, COUNT field, and L field, where the F field set to 1 indicates the segmentation offset end position sosend following the negative sequence number N with the lost header fragment, the COUNT field set to 0 indicates the segmentation offset positions SOstart and sosend not following the middle fragment, and the L field set to 1 indicates the segmentation offset start position SOstart following the negative sequence number N with the lost tail fragment; for the case that the header fragment with the sequence number of N +2 is lost, the data receiving end sets E4 to 1, and starts the subsequent F field, L field and COUNT field, where the F field set 1 indicates the segment offset end position sosend following the lost header fragment after the negative sequence number N +2, the COUNT field set 0 indicates the segment offset positions SOstart and SOstart following no middle fragment, and the L field set 0 indicates the segment offset start position SOstart following no lost tail fragment; for the case that the tail fragment with the sequence number N +4 is lost, the data receiving end sets E4 to 1, and starts the subsequent F field, COUNT field, and L field, where the F field set to 0 indicates that the segment offset end position sosend of the lost head fragment is not followed, the COUNT field set to 0 indicates that the segment offset positions SOstart and sosend of the middle fragment are not followed, and the L field set to 1 indicates that the segment offset start position SOstart of the tail fragment following the negative sequence number N +4 is followed by the lost tail fragment.

Also as shown in fig. 10, the receiving end receives the RLC SDU at the current RLC reception sliding window; the format of the RLC status report shown in fig. 11 corresponds to the RLC SDU reception case shown in fig. 10. In this example, as can be seen from fig. 10, the data receiving end detects that four RLC SDUs with sequence numbers from N to N +3 are received in the current RLC reception sliding window, and the data receiving end detects that five RLC data PDUs are missing, wherein the first segment is a header slice (byte offset position from 0 to 65) of the RLC SDU with sequence number N +1, the second segment is a middle slice (byte offset position from 300 to 350) of the RLC SDU with sequence number N +1, the third segment is a tail slice (byte offset position from 420 to tail) of the RLC SDU with sequence number N +1, the fourth segment is a middle slice 1 (byte offset position from 50 to 95) of the RLC SDU with sequence number N +3, and the fifth segment is a middle slice 2 (byte offset position from 310 to 375) of the RLC SDU with sequence number N + 3; the data receiving end correctly receives the RLC SDU with sequence number N, the middle slice 1 (byte offset position from 66 to 299) and the middle slice 2 (byte offset position from 351 to 419) of the RLC SDU with sequence number N +1, the RLC SDU with sequence number N +2, the header slice (byte offset position from 0 to 49) and the middle slice (byte offset position from 96 to 309) and the tail slice (byte offset position from 376 to tail) of the RLC SDU with sequence number N + 3; the RLC SDU of N +4 is the next unreceived RLC SDU by the data receiving end. Correspondingly, in the RLC status report format diagram 11, for the case where the header fragment, the middle fragment, and the tail fragment of the RLC SDU with sequence number N are all lost, the data receiving end sets E4 to 1, and starts the subsequent F field, COUNT field, and L field, where the F field set 1 indicates that the negative sequence number N is followed by the segmentation offset end position soind of the lost header fragment, the COUNT field set 1 indicates that the negative sequence number N is followed by the segmentation offset positions SOstart and soind of 1 group of middle fragments, and the L field set 1 indicates that the negative sequence number N is followed by the segmentation offset start position SOstart of the lost tail fragment; for the case that the middle slice 1 and the middle slice 2 of the RLC SDU with sequence number N +3 are lost, the data receiving end sets E4 to 1, and starts the subsequent F field, L field and COUNT field, where the F field set 0 indicates that the segment offset end position soind of the lost header slice is not followed, the COUNT field set 2 indicates that the segment offset positions SOstart and soind of the 2 groups of middle slices are followed by the negative sequence number N +3, and the L field set 0 indicates that the segment offset start position SOstart of the lost tail slice is not followed.

It can be seen from the above specific application scenarios that, by the optimization method provided by the present invention, when a missing slice is indicated in a status report, only SOend may be indicated for a header slice (SOstart omitted), only SOstart may be indicated for a tail slice (SOstart omitted), and a sequence number NACK _ SN may be indicated only once for multiple slices of the same RLC SDU, thereby achieving the purpose of reducing the status report overhead.

The following describes the radio link control status report optimized transmission system provided by the present invention, and the radio link control status report optimized transmission system described below and the radio link control status report optimized transmission method described above can be referred to correspondingly.

Fig. 12 is a schematic structural diagram of a radio link control status report optimized transmission system provided in the present invention, as shown in fig. 12, including: an obtaining module 1201, an updating module 1202, and an outputting module 1203, wherein:

the obtaining module 1201 is configured to obtain an original report field set in an NR RLC protocol status report format; the updating module 1202 is configured to add a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field, and a segment offset position group number indication field of the middle fragment based on the original report field set to obtain an updated report field set; the output module 1203 is configured to determine received RLC data, segment missing RLC SDUs or RLC SDUs in the RLC data based on the updated report field set, and output an RLC transmission status report.

The invention adds new indication field in the prior NR RLC protocol, so that the wireless link control layer does not need to carry all field information when reporting the transmission state of the lost fragment, thereby greatly reducing the overhead of the state report under the condition of indicating the lost fragment, and simultaneously effectively reducing the sending times of the state report under the condition of insufficient cache of the MAC sending state report, thereby reducing the feedback time delay of the state report.

Fig. 13 illustrates a physical structure diagram of an electronic device, and as shown in fig. 13, the electronic device may include: a processor (processor)1310, a communication Interface (Communications Interface)1320, a memory (memory)1330 and a communication bus 1340, wherein the processor 1310, the communication Interface 1320 and the memory 1330 communicate with each other via the communication bus 1340. The processor 1310 may invoke logic instructions in the memory 1330 to perform a radio link control status report optimized transmission method comprising: acquiring an original report field set in a state report format of an NR RLC protocol; based on the original report field set, adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a middle fragment segment offset position group number indication field to obtain an updated report field set; and determining received RLC data, segmenting the missing RLC SDUs or RLC SDUs in the RLC data based on the updated report field set, and outputting an RLC transmission status report.

In addition, the logic instructions in the memory 1330 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the radio link control status report optimized transmission method provided by the above methods, the method comprising: acquiring an original report field set in a state report format of an NR RLC protocol; based on the original report field set, adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a middle fragment segment offset position group number indication field to obtain an updated report field set; and determining received RLC data, segmenting the missing RLC SDUs or RLC SDUs in the RLC data based on the updated report field set, and outputting an RLC transmission status report.

In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor is implemented to perform the radio link control status report optimized transmission method provided above, the method comprising: acquiring an original report field set in a state report format of an NR RLC protocol; based on the original report field set, adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a middle fragment segment offset position group number indication field to obtain an updated report field set; and determining received RLC data, segmenting the missing RLC SDUs or RLC SDUs in the RLC data based on the updated report field set, and outputting an RLC transmission status report.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimized transmission of radio link control status reports, comprising:

determining received RLC data, segmenting missing RLC SDUs or RLC SDUs in the RLC data based on the updated report field set, and outputting an RLC transmission status report;

the acquiring of the original report field set in the NR RLC protocol status report format includes:

acquiring a PDU type indication field, a status report type indication field, a first report field, a second report field, a third report field, a reserved field, a response sequence number field, a negative response sequence number field, a segmentation offset starting position field, a segmentation offset ending position field and an unsuccessfully received RLC SDU number field;

determining that the third report field includes a determination indication of whether the negative acknowledgement sequence number field is subsequently accompanied by the number of unsuccessfully received RLC SDUs field;

adding a fourth report field, a header fragment judgment indication field, a tail fragment judgment indication field and a middle fragment segment offset position group number indication field based on the original report field set to obtain an updated report field set, including:

determining that the tail fragmentation judgment indication field comprises a judgment indication of whether the negative acknowledgement sequence number field is followed by the fragmentation offset end position field;

the data receiving end constructs an RLC status report, the RLC status report comprises a negative acknowledgement sequence number NACK _ SN field, the fourth report field is a field which indicates whether NACK _ SN is followed by a field which describes the NACK _ SN lost fragmentation condition, the head fragmentation judgment indication field is a SOend field which indicates whether NACK _ SN is followed by an indication head fragmentation, the tail fragmentation judgment indication field is a field which indicates whether NACK _ SN is followed by SOstart which indicates a tail fragmentation, the segmentation offset position group number indication field of the middle fragmentation is a field which indicates NACK _ SN is followed by the SOstart which indicates a middle fragmentation and the group number of the SOend field, the segmentation offset starting position and the segmentation offset ending position field; and the data receiving end sends the RLC status report to the data sending end.

2. The RLC transmission status report optimizing transmission method according to claim 1, wherein the determining the received RLC data, and the slicing the missing RLC SDU or RLC SDU in the RLC data based on the updated report field set, outputting an RLC transmission status report comprises:

if the head segment of any RLC SDU or RLC SDU segment is detected to be lost, the RLC transmission state report comprises the negative response serial number field, the fourth report field is determined to be 1, the head segment judgment indication field is 1, the tail segment judgment indication field and the segmentation offset position group number indication field of the middle segment are determined to be 0, and the segmentation offset end position field is determined to be the offset position of the last byte data of the head segment in any RLC SDU or RLC SDU segment;

if detecting that any RLC SDU or the tail segment of the RLC SDU segment is lost, the RLC transmission state report comprises the negative response sequence number field, determining that the fourth report field is 1, the head segment judgment indication field is 0, the tail segment judgment indication field is 1, and the segment offset position group number indication field of the middle segment is 0, and determining that the segment offset starting position field is the offset position of the first byte data of the tail segment in any RLC SDU or RLC SDU segment;

if the head fragment and the tail fragment of any RLC SDU or RLC SDU fragment are detected to be lost, the RLC transmission state report comprises the negative response sequence number field, the fourth report field, the head fragment judgment indication field and the tail fragment judgment indication field are both 1, the segmentation offset position group number indication field of the middle fragment is 0, the segmentation offset end position field is determined to be the offset position of the last byte data of the head fragment in any RLC SDU or RLC SDU fragment, and the segmentation offset start position field is determined to be the offset position of the first byte data of the tail fragment in any RLC SDU or RLC SDU fragment.

3. The RLC transmission status report optimizing transmission method according to claim 1, wherein the determining the received RLC data, and the slicing the missing RLC SDU or RLC SDU in the RLC data based on the updated report field set, and outputting an RLC transmission status report further comprises:

if detecting that the middle fragment of any RLC SDU or RLC SDU fragment is lost and the number of the lost middle fragments is within a preset number range, determining that the fourth report field is 1, the head fragment judgment indication field and the tail fragment judgment indication field are 0, and the segmentation offset position group number indication field of the middle fragment is the number of the middle fragments, and further including the segmentation offset starting position field and the segmentation offset ending position field of the middle fragment number array, where any segmentation offset starting position field and any segmentation offset ending position field are offset positions of the first byte data and the last byte data of any lost fragment in the RLC SDU or RLC SDU fragment, respectively;

if it is detected that any RLC SDU or header fragment and middle fragment of an RLC SDU fragment are missing, wherein the number of the lost middle fragments is within the preset number range, the RLC transmission status report includes the negative acknowledgement sequence number field, and it is determined that the fourth report field is 1, the header fragment judgment indication field is 1, and the tail fragment judgment indication field is 0, the segment offset position group number indication field of the middle fragment is the number of the middle fragments, the segment offset ending position field is determined to be the offset position of the last byte data of the header fragment in any RLC SDU or RLC SDU fragment aiming at the header fragment, and the segment offset starting position field and the segment offset ending position field are respectively the offset positions of the first byte data and the last byte data of each middle fragment in the RLC SDU or RLC SDU fragment aiming at each middle fragment;

if it is detected that any RLC SDU or the middle fragment and the tail fragment of the RLC SDU fragment are lost, wherein the number of the lost middle fragments is within the preset number range, the RLC transmission status report includes the negative acknowledgement sequence number field, and it is determined that the fourth report field is 1, the header fragment judgment indication field is 0, and the tail fragment judgment indication field is 1, the segment offset position group number indication field of the middle fragment is the number of the middle fragments, the segment offset starting position field and the segment offset ending position field are determined for each middle fragment and are respectively the offset positions of the first byte data and the last byte data of each middle fragment in the RLC SDU or the RLC SDU fragment, and the segment offset starting position field is determined for the tail fragment and is the offset position of the first byte data of the tail fragment in any RLC SDU or RLC SDU fragment;

if it is detected that the head segment, the middle segment and the tail segment of any RLC SDU or RLC SDU segment are lost, wherein the number of the lost middle segments is within the preset number range, the RLC transmission status report includes the negative response sequence number field, it is determined that the fourth report field, the head segment judgment indication field and the tail segment judgment indication field are all 1, the segmentation offset position group number indication field of the middle segment is the number of the middle segments, it is determined for the head segment that the segmentation offset end position field is the offset position of the last byte data of the head segment in any RLC SDU or RLC SDU segment, and it is determined for each middle segment that the segmentation offset start position field and the segmentation offset end position field are the offset positions of the first byte data and the last byte data of each middle segment in the RLC SDU or RLC SDU segment respectively, and determining the segmentation offset starting position field as the offset position of the first byte data of the tail fragment in any RLC SDU or RLC SDU fragment aiming at the tail fragment.

4. The RLC transmission status report optimizing transmission method according to claim 3, wherein the determining the received RLC data, and the slicing the missing RLC SDU or RLC SDU in the RLC data based on the updated report field set, and outputting an RLC transmission status report further comprises:

if the middle fragments of any RLC SDU or RLC SDU fragment are detected to be lost and the number of the lost middle fragments is larger than the preset number range, extracting the lost fragments arranged in the preset number range, and outputting a first status report according to the fact that only the middle fragments are lost or the lost fragments include a header fragment and the middle fragments;

re-determining the negative response sequence numbers corresponding to the remaining middle fragments, and outputting a second state report according to the condition that only the middle fragments are lost or the lost fragments comprise the middle fragments and the tail fragments;

and assembling the first status report and the second status report to form the RLC transmission status report.

5. The RLC transmission status report optimizing transmission method according to claim 1, wherein the determining the received RLC data, and the slicing the missing RLC SDU or RLC SDU in the RLC data based on the updated report field set, and outputting an RLC transmission status report further comprises:

and if any RLC SDU is detected to be lost or only one middle fragment is detected to be lost, the RLC transmission state report determines that a fourth report field is 0 and outputs the fourth report field according to the original report field set.

6. A radio link control status report optimized transmission system, comprising:

the output module is used for determining the received RLC data, segmenting the missing RLC SDU or RLC SDU in the RLC data based on the updated report field set and outputting an RLC transmission state report;

the acquisition module is specifically configured to:

the update module is specifically configured to:

7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method for radio link control status report optimized transmission according to any of the claims 1 to 5.

8. A non-transitory computer readable storage medium, having stored thereon a computer program, which, when being executed by a processor, carries out the steps of the radio link control status report optimized transmission method according to any of the claims 1 to 5.