CN111132232A - Method and device for intelligently receiving 5G NR RLC UMD PDU - Google Patents

Abstract

The invention relates to a method and a device for intelligently receiving 5G NR RLC UMD PDUs, belonging to the technical field of communication. The method comprises the following steps: after receiving the RLC PDU sending notice of the MAC layer, the RLC layer starts a first detection device and judges whether a receiving cache device meets receiving conditions or not; then detecting whether the PDU is complete or not by matching the SI field, automatically storing the PDU to a first buffer area and a second buffer area according to the value of the SI field, and discarding the PDU not containing the SI field; if PDU exists in the first receiving buffer area, RLC header fields are automatically matched and deleted and then forwarded to an upper layer; and if the PDU exists in the second receiving buffer area, triggering a second detection device to adaptively update the judgment condition, detecting whether the value of the SN is in a receiving range or not, discarding the PDU which is not in the range, and sending the PDU in the range to the upper layer after the PDU in the range enters a sliding recombination window to finish the segmentation recombination. The invention can reduce the probability of problems in subsequent receiving.

Description

Method and device for intelligently receiving 5G NR RLC UMD PDU

Technical Field

The invention belongs to the technical field of communication, and relates to a method and a device for intelligently receiving a 5 GNRRLCUMDPDU.

Background

The 5G technology provides a high-speed connection, low-delay and large-data throughput capability internet, since 3GPP announces completion of the first international standard Release 15(R15) of 5G in 2018, a plurality of telecommunication operators around the world start to successively test 5G service, and three telecommunication operators and a plurality of equipment manufacturers in China actively promote 5G construction. The 5G is taken as a next-generation communication technology and represents a future application scene of the interconnection of everything, and a new-generation information technology system constructed on the basis of the 5G technology brings brand-new development for mobile communication.

Radio Link Control (RLC) is an important component of 5GNR for implementing data transmission, is located between PDCP layer and MAC layer of protocol stack, and provides data segmentation, data transmission (retransmission), and data discard services for user plane and control plane data. The RLC data transmission modes are classified into three types, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM), according to different types of transmission data, and correspond to three RLC entities.

The efficiency of data transmission in the unacknowledged mode is high, but because the module does not feed back the acknowledge information, the module cannot know whether the data is normally transmitted to the peer entity, so the reliability of the mode is poor; in an actual 5GNR system, due to the influence of physical layer and air interface, the header field of RLC pdu in transmission is likely to be mutated or lost before the peer RLC entity receives the header field. In this case, the receiving end of the peer entity receives an incomplete PDU and possibly receives a PDU with a sudden change in SN, resulting in a data transmission service interruption or receiving erroneous data.

Disclosure of Invention

In view of this, the present invention provides a method and an apparatus for intelligently receiving a 5GNRRLCUMDPDU, so as to make the receiving process of the UMDPDU intelligent and reliable, reduce the probability of problems occurring in subsequent receiving, and achieve high-efficiency data transmission.

In order to achieve the purpose, the invention provides the following technical scheme:

an apparatus for intelligently receiving a 5GNRRLCUMDPDU, comprising:

the first detection device is started automatically after the RLC layer receives the RLC PDU sending notice of the MAC layer, whether the PDU is complete or not is detected by matching with the SI field, if the PDU does not include the SI field, the PDU is directly discarded, and if not, the PDU is placed into a receiving cache;

the receiving cache device automatically stores the RLCPDU to a first cache region and a second cache region according to the value of the SI field;

the second detection device is used for judging whether the sequence number of the RLC PDU is in a receiving range, directly discarding the PDU which is not in the receiving range, and otherwise, performing RLC data sliding recombination;

discarding means for discarding RLC PDUs which do not meet the detection conditions of the first and second detecting means and which cannot be segmented and reassembled;

the RLC sliding recombination device is used for waiting and recombining all the segmented data of the RLC SDU, if all the segmented data are not received in the specified time, the received segmented data are discarded, and if not, the recombination is carried out;

and the sending device is used for sending the RLC PDU of the receiving buffer area and the RLC PDU after segmentation and recombination to the PDCP layer.

Optionally, the first detecting device further includes a detection module configured to detect a state of the receiving buffer device, and trigger a data receiving process if the receiving buffer is empty or there is still a storage space; if the receiving cache is full, the first detection module is suspended, and the receiving process is started after the cache is recovered to be normal.

Optionally, the receiving buffer device may be dynamically divided into a first receiving buffer area and a second receiving buffer area according to the data type, where the first receiving buffer area is responsible for storing PDUs with SI being 00, and the second receiving buffer area is responsible for storing PDUs with SI being other values.

Optionally, the second detecting device determines whether the sequence number of the PDU is within a receiving range, that is, the PDU with Re _ Next _ response ═ SN < SNmax meets the receiving condition.

Optionally, the second detection device determines that the adaptive updating of the second detection condition is further included, where a Re _ Next _ reset state variable maintains a value of an earliest SN to be recombined, a value of the earliest SN changes with a change of a sliding recombination window, and a value of the SNmax is dynamically configured by the RRC layer according to the radio resource condition, where the sequence number is 6 bits or 12 bits.

Optionally, the RLC sliding reassembly device further includes an RLC header field deleting device, and if all data segments with SN ═ X are received within a certain time, the RLC header field is automatically matched and deleted, and then forwarded to an upper layer; otherwise, the segmented data with received SN X is discarded.

Optionally, the sending apparatus further includes an RLC header field deleting apparatus, which forwards the RLC header field of the RLC pdu in the first matching receiving buffer area to an upper layer after deleting the RLC header field; the RLC PDU after being recombined is directly forwarded to an upper layer;

all RLC devices do not perform a sorting operation on the RLC PDUs.

A method of intelligently receiving a 5G NR RLC UMD PDU, the method implemented by a receiving device at an RLC layer, the receiving device performing the steps of:

the RLC receives an RLC PDU sending notice of an MAC layer, and a first detection device is started to judge whether a receiving cache device meets receiving conditions;

detecting whether the PDU header field is complete or not by matching the SI field, automatically storing the PDU header field into a first buffer area and a second buffer area according to the value of the SI field, and discarding the PDU not containing the SI field;

processing the RLC PDU of the first receiving buffer area, automatically matching and deleting the RLC header field and then forwarding the RLC PDU to an upper layer;

processing RLC PDU of the second receiving buffer area, triggering a second detection device to adaptively update judgment conditions, judging whether the sequence number of each PDU of the second receiving buffer area is in a receiving range, entering a recombination flow for a data segment in the range, or discarding the PDU;

detecting an SN range, if the value of the SN is in a receiving range, enabling the PDU to enter a sliding recombination window, recombining the PDU by a recombination device according to the sequence number of the PDU, if all segments with the SN being X are received within a certain time, automatically matching and deleting an RLC header field and then entering a sending process, and if not, discarding all segments with the SN being X currently received;

and sending the RLC SDU which is in the receiving buffer area and has completed segmentation and reassembly to a PDCP layer.

Optionally, before the receiving the buffer, the method further includes the following steps:

the step of receiving RLC PDUs is started only after receiving a transmission opportunity indication from the lower MAC.

Optionally, before the detecting the SN range, the following steps are further included:

and adaptively updating the judgment condition of the second detection device, wherein a lower judgment condition limit is configured according to the Re _ Next _ Ressembly value of the sliding recombination window, and an upper judgment condition limit is configured according to the sequence number configured by the RRC layer.

The invention has the beneficial effects that:

firstly, after receiving an RLC PDU sending notice of an MAC layer, the invention starts a first detection device automatically, judges whether a receiving buffer device meets receiving conditions and then starts a receiving step; detecting PDU head field by matching SI field to judge whether data is complete; automatic partition storage is realized according to the value of the SI field, and the size of the storage area is dynamically allocated; adaptively updating a second detection range according to the sliding recombination window and the upper layer configuration, and further judging whether SN of the RLC PDU changes suddenly; and according to different RLC header fields, the length of the RLC header field is automatically matched, deleted and then forwarded to an upper layer. By the method, the UMDPDU receiving process can be intelligentized and reliable, the probability of problems in subsequent receiving is reduced, and high-efficiency data transmission is realized.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of an apparatus for intelligently receiving 5G NR RLC UMD PDUs according to the present invention;

FIG. 2 is a first flowchart of a method of intelligently receiving a 5G NR RLC UMD PDU in accordance with the present invention;

FIG. 3 is a second flow chart of a method of intelligently receiving a 5G NR RLC UMD PDU in accordance with the present invention;

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an apparatus for intelligently receiving a 5G NR RLC UMD PDU according to the present invention. Wherein the apparatus is included in a terminal device of a wireless communication system. The wireless communication system is a 3GPP 5G NR-based wireless communication system. The terminal equipment of the wireless communication system comprises a base station and a user device. It should be noted that those skilled in the art should understand that the wireless communication system, the base station, and the user equipment are not limited to the above description.

The receiving device is located in the RLC layer and includes a first detecting device 11, a receiving buffer device 12, a second detecting device 13, a discarding device 14, an RLC sliding reassembly device 15, and a transmitting device 16.

The first detecting device 11 is self-started after the RLC layer receives the RLC PDU sending notification of the MAC layer, and is configured to detect whether the received RLC PDU contains an SI field, directly discard the received RLC PDU if the received RLC PDU does not contain the SI field, and otherwise, place the received RLC PDU into a receiving buffer.

The first detection module 11 further comprises a detection module for detecting the state of the receiving cache device, and if the receiving cache is empty or has a storage space, the data transmission process is triggered; if the receiving buffer is full, the first detection module 11 is suspended.

And the receiving buffer device 12 automatically stores the RLC PDU to a buffer area I and a buffer area II according to the value of the SI field.

The receiving buffer 12 should dynamically divide a receiving buffer area one and a receiving buffer area two according to the received data amount, wherein the receiving buffer area one is responsible for storing PDUs with SI being 00, and the receiving buffer area two is responsible for storing PDUs with SI being other values.

A second detecting device 13, configured to determine whether the sequence number of the RLC PDU is within an acceptance range Re _ Next _ response ═ SN < SNmax, and directly discard the PDU that is not within the range, otherwise, perform RLC data sliding reassembly, and adaptively update the determination range of the second detection before each determination.

The second detection device 13 further includes an automatic update of the determination range, wherein a value of Re _ Next _ response changes with the reassembly window, and a value of SNmax is dynamically configured by the RRC layer to have a sequence number of 6 bits or 12 bits according to the radio resource condition.

And a discarding device 14, configured to discard RLC PDUs which do not meet the detection conditions of the first and second detection devices 11 and 13 and cannot be segmented and reassembled.

The RLC sliding reassembly device 15 is configured to wait and reassemble all the segmented data of the RLC SDU, discard the received segmented data if all the segmented data is not received in a specified time, and otherwise perform reassembly.

The RLC reassembly device 15 further includes deleting after automatically matching the RLC header field, and if all data segments with SN ═ X are received within a certain time, deleting the header field and entering a sending process; otherwise, the segmented data with received SN X is discarded.

And a sending device 16, configured to send the RLC PDU buffered in one area and the segmented and reassembled RLC PDU to the PDCP layer.

The sending device 16 further comprises deleting the RLC header field after automatically matching the RLC header field, and forwarding the RLC PDU header field of the first receiving buffer area to the upper layer after deleting the RLC PDU header field; and directly forwarding the RLC PDU after the recombination is finished to an upper layer.

FIG. 2 is a first flowchart of a method for intelligently receiving a 5GNR RLC UMD PDU according to the present invention, which is applicable to the case where the SI field of the PDU is lost or the SI is 00. The method is implemented by a first detection device, a receiving buffer device, a discarding device and a sending device, wherein the first detection device executes the steps S11, S12, S13 and S15, the discarding device executes the step S14, the receiving buffer device executes the step S16, and the sending device executes the step S17.

In step S11, the RLC receives the RLC PDU transmission notification of the MAC layer, and the self-starting first detection device determines whether the reception buffer device satisfies the reception condition.

Next, in step S12, detecting the state of the receiving buffer device, and if the receiving buffer is empty or has a storage space, triggering a data transmission process; if the receiving buffer is full, the first detection module is suspended.

At step S13, the matching SI field determines whether the data is complete, where the SI value is the first two bytes of the PDU.

The matching length of the SI is two bytes, located in the first two bytes of the PDU. If the SI of the RLC PDU does not exist or is lost, the RLC PDU is indicated to be possibly abnormal, and the RLC PDU is discarded.

At step S14, the PDU missing the SI field is discarded;

in step S15, it is detected whether the SI of the RLC PDU is 00.

If the SI of the RLC PDU is 00, it indicates that the PDU includes the whole SDU, i.e. the SDU is not segmented, and can be directly transmitted to the upper layer after the RLC header field is deleted.

In step S16, the RLC PDU with SI field 00 is placed in a receiving buffer, wherein the storage area may be dynamically divided according to the received PDU data size.

In step S17, the RLC header field is automatically matched and deleted and then forwarded to the upper layer.

When the header field of the PDU does not contain SN, the length of the automatic matching RLC header is eight bytes, namely SI of two bytes and reserved bits of six bytes, and only the eight bytes are deleted when the automatic matching is deleted.

FIG. 3 is a second flowchart of an apparatus for intelligently receiving a 5G NR RLC UMD PDU according to the present invention, which is applicable to the case where the SI field of the PDU is 00, 01 or 11. The method is implemented by a first detection device, a receiving buffer device, a discarding device, a second detection device, a reorganizing device and a sending device, wherein the first detection device executes steps S21, S22, S23 and S25, the discarding device executes step S24, the receiving buffer device executes step S26, the second detection device executes step S27, the reorganizing device executes steps S28 and S29, and the sending device executes step S210.

In step S21, the RLC receives the RLC PDU transmission notification of the MAC layer, and the self-starting first detection device determines whether the reception buffer device satisfies the reception condition.

Next, in step S22, detecting the state of the receiving buffer device, and if the receiving buffer is empty or has a storage space, triggering a data transmission process; if the receiving buffer is full, the first detection module is suspended.

At step S23, the matching SI field determines whether the data is complete, where the SI value is the first two bytes of the PDU.

If the SI of the RLC PDU is not present or lost, it indicates that the RLC PDU may be abnormal, and the RLC PDU may be discarded.

At step S24, the PDU missing the SI field is discarded;

in step S25, it is detected whether the SI of the RLC PDU is 00.

If the SI of the RLC PDU is not 00, it indicates that the PDU contains SDU segments, i.e. the SDU segments are not transmitted to the upper layer until all segments have been reassembled.

In step S26, the RLC PDU whose SI field is not 00 is placed in buffer two.

In step S27, it is detected whether the SN of the RLC PDU is within the range Re _ Next _ response ═ SN < SNmax.

The second detection device adaptively updates the judgment condition, the lower limit of the judgment condition is the value of Re _ Next _ Ressembly of the recombination window, and the upper limit of the judgment condition is the sequence number (6 bits or 12 bits) configured by the RRC layer. If the PDU is not received within the range, the SN of the PDU changes suddenly or the PDU is not received. If the value of SN is in the receiving range, the PDU enters a sliding reassembly window.

In step S28, it is determined whether all PDUs with SN ═ X have been received, and if all fragments have been received, it is determined that all SDU fragments have been received, and reassembly and uploading may be completed.

If all the segments with SN equal to X are received in a certain time, deleting and entering a sending process after automatically matching the RLC header, otherwise, discarding all the segments with SN equal to X currently received. Wherein, the value of a certain time is configured by the RRC layer.

In step S29, after the RLC header field is deleted, the PDU is reassembled into a complete SDU.

When the head field of PDU contains SN, the head field of automatic matching RLC has four conditions, the length is eight bytes, sixteen bytes, twenty-four bytes and thirty-two bytes, the automatic matching is realized according to the values of SI and SN, at this time, only the length of corresponding head field is deleted when the automatic matching is deleted.

In step S210, the RLC SDU having completed segmentation reassembly is delivered to the PDCP layer.

The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network.

In summary, according to the scheme of the present invention, first, after receiving the RLC PDU sending notification of the MAC layer, the first detection device is started, and the receiving step is started after determining whether the receiving buffer device meets the receiving condition; detecting PDU head field by matching SI field to judge whether data is complete; realizing automatic partition storage according to the SI field value, and dynamically partitioning the size of the storage area; adaptively updating a second detection range according to the sliding recombination window and the upper layer configuration, and further judging whether SN of the RLC PDU changes suddenly; and according to different RLC header fields, automatically matching the RLC header fields, deleting the RLC header fields and forwarding the RLC header fields to an upper layer. By the method, the UMD PDU receiving process can be intelligentized and reliable, the probability of problems in subsequent receiving is reduced, and high-efficiency data transmission is realized.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. An apparatus for intelligently receiving a 5GNR RLC UMD PDU, characterized in that: the method comprises the following steps:

the first detection device is started automatically after the RLC layer receives the RLC PDU sending notice of the MAC layer, whether the PDU is complete or not is detected by matching with the SI field, if the PDU does not include the SI field, the PDU is directly discarded, and if not, the PDU is placed into a receiving cache;

the receiving buffer device automatically stores the RLC PDU to a buffer area I and a buffer area II according to the value of the SI field;

the second detection device is used for judging whether the sequence number of the RLC PDU is in a receiving range, directly discarding the PDU which is not in the receiving range, and otherwise, performing RLC data sliding recombination;

discarding means for discarding RLC PDUs which do not meet the detection conditions of the first and second detecting means and which cannot be segmented and reassembled;

the RLC sliding recombination device is used for waiting and recombining all the segmented data of the RLC SDU, if all the segmented data are not received in the specified time, the received segmented data are discarded, and if not, the recombination is carried out;

and the sending device is used for sending the RLC PDU of the receiving buffer area and the RLC PDU after segmentation and recombination to the PDCP layer.

2. The apparatus of claim 1, wherein the apparatus for intelligently receiving 5G NR RLC UMD PDUs is characterized in that: the first detection device also comprises detection of the state of the receiving cache device, and a data receiving process is triggered if the receiving cache is empty or a storage space is still available; if the receiving cache is full, the first detection module is suspended, and the receiving process is started after the cache is recovered to be normal.

3. The apparatus of claim 1, wherein the apparatus for intelligently receiving 5G NR RLC UMD PDUs is characterized in that: the receiving buffer device can be dynamically divided into a first receiving buffer area and a second receiving buffer area according to the data type, wherein the first receiving buffer area is responsible for storing the PDU with the SI being 00, and the second receiving buffer area is responsible for storing the PDU with the SI being other values.

4. The apparatus of claim 1, wherein the apparatus for intelligently receiving 5G NR RLC UMD PDUs is characterized in that: the second detection device determines whether the sequence number of the PDU is within the reception range, that is, the PDU with Re _ Next _ response ═ SN < SNmax meets the reception condition.

5. The apparatus of claim 4, wherein the apparatus for intelligently receiving 5G NR RLC UMD PDUs is characterized in that: and the second detection device judges and also comprises self-adaptive updating of a second detection condition, wherein a Re _ Next _ Ressembly state variable maintains the value of the earliest SN waiting for recombination, the value changes along with the change of a sliding recombination window, and the value of SNmax is dynamically configured into 6 bits or 12 bits by an RRC layer according to the radio resource condition.

6. The apparatus of claim 1, wherein the apparatus for intelligently receiving 5G NR RLC UMD PDUs is characterized in that: the RLC sliding recombination device also comprises an RLC header field deleting device, and if all data segments with SN (X) are received within a certain time, the RLC header field is automatically matched and deleted and then forwarded to an upper layer; otherwise, the segmented data with received SN X is discarded.

7. The apparatus of claim 1, wherein the apparatus for intelligently receiving 5G NR RLC UMD PDUs is characterized in that: the sending device also comprises an RLC head field deleting device which automatically matches the RLC head field of the RLC PDU of the receiving and caching area and forwards the RLC head field to an upper layer after deleting; the RLC PDU after being recombined is directly forwarded to an upper layer;

all RLC devices do not perform a sorting operation on the RLC PDUs.

8. A method for intelligent reception of 5GNR RLC UMD PDUs, wherein the method is implemented by a receiving device at the RLC layer, wherein the receiving device performs the steps of:

the RLC receives an RLC PDU sending notice of an MAC layer, and a first detection device is started to judge whether a receiving cache device meets receiving conditions;

detecting whether the PDU header field is complete or not by matching the SI field, automatically storing the PDU header field into a first buffer area and a second buffer area according to the value of the SI field, and discarding the PDU not containing the SI field;

processing the RLC PDU of the first receiving buffer area, automatically matching and deleting the RLC header field and then forwarding the RLC PDU to an upper layer;

processing RLC PDU of the second receiving buffer area, triggering a second detection device to adaptively update judgment conditions, judging whether the sequence number of each PDU of the second receiving buffer area is in a receiving range, entering a recombination flow for a data segment in the range, or discarding the PDU;

detecting an SN range, if the value of the SN is in a receiving range, enabling the PDU to enter a sliding recombination window, recombining the PDU by a recombination device according to the sequence number of the PDU, if all segments with the SN being X are received within a certain time, automatically matching and deleting an RLC header field and then entering a sending process, and if not, discarding all segments with the SN being X currently received;

and sending the RLC SDU which is in the receiving buffer area and has completed segmentation and reassembly to a PDCP layer.

9. The method of claim 8, wherein before the receiving buffer, the method further comprises the following steps:

the step of receiving RLC PDUs is started only after receiving a transmission opportunity indication from the lower MAC.

10. The method of claim 8, wherein prior to the detecting the SN range, the method further comprises the steps of:

and adaptively updating the judgment condition of the second detection device, wherein a lower judgment condition limit is configured according to the Re _ Next _ Ressembly value of the sliding recombination window, and an upper judgment condition limit is configured according to the sequence number configured by the RRC layer.

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