WO2012000312A1 - Method and device for constructing status report - Google Patents

Abstract

A method and device for constructing a status report are provided in the present invention, and the method includes: if resolving the received Protocol Data Unit (PDU) and determining that it has a polling sign bit, or if the local reordering timing is overtime, obtaining the maximum sequence number and the minimum sequence number of the incompletely-received PDUs; if determining that the number of the incompletely-received PDUs between the maximum sequence number and the minimum sequence number of the incompletely-received PDUs is larger than a predetermined number, obtaining negative acknowledgement information of a predetermined number of incompletely-received PDUs between the minimum sequence number and the maximum sequence number of the incompletely-received PDUs, so as to construct the status report. The present invention overcomes the shortcomings in the process of constructing a status report on the Radio Link Control (RLC) layer in the prior Long Term Evolution (LTE) system, and improves the efficiency of constructing the RLC status report, thereby saving the bandwidth of wireless links.

Description

 Method and device for constructing state report

Technical field

 The present invention relates to the field of wireless communications, and in particular, to a method and apparatus for constructing a state of a radio link control layer protocol entity in an LTE (Long Term Evolution) system.

Background technique

 The RLC (Radio Link Control) protocol layer is located under the PDCP (Packet Data Convergence Protocol) layer in the LTE radio interface protocol stack, above the MAC (Media Access Control) layer. , is a sublayer of layer 2. The RLC layer provides segmentation and retransmission services for user service data and control data. The functions of the RLC sublayer include link control, delivery of upper layer (RRC/PDCP) PDUs (Protocol Data Units), reassembly, segmentation, re-segmentation and cascading, and sequential delivery of PDUs to the upper layer, ARQ ( Automatic Repeat-reQuest, automatic retransmission request) error correction, repetitive detection, flow control, protocol error detection and repair, RLC reconstruction, etc. The function of the RLC sublayer is implemented by the RLC entity. Each RLC entity can be configured by RRC (Radio Resource Control) into three modes for performing data transmission: Transparent Mode (TM), Unconfirmed Mode ( Unacknowledged Mode (UM) and Acknowledged Mode (AM). The ARQ retransmission in the acknowledge mode is to send a status report to the sender through the receiver. The sender acknowledges the ACK_SN (Acknowledgement Sequence Number) and NACK SN (Negative Acknowledgement Sequence) according to the status. Number, unacknowledged response sequence number) to determine which PDUs have been acknowledged by the receiving end, which PDUs or PDU fragments need to be retransmitted, thus ensuring the reliability of data transmission.

In the prior art, the status report needs to be constructed on the RLC receiving side according to the protocol parameters VR(R) and VR(MS), but in the case where the packet loss is serious, VR(R) and VR(MS) may be There will be many PDUs not received. In this case, constructing a status report by VR(R) and VR(MS) protocol parameters according to the prior art will make the status report very large, and the RLC transmitting side receives the status report. Later, the Nack (unacknowledged response) information in the status report is processed, and the retransmission PDU is assembled. However, because the Nack information is too much, the Nack information in the status report may not be processed yet. Upon completion, the receiving side sends a status report. When the receiving side reports the status, the receiving side will repeatedly send the Nack that has not been received by the PDU corresponding to the Nack information in the previous status report. This will compare the channel quality. When it is bad, it wastes a lot of upstream bandwidth.

Summary of the invention

 The technical problem to be solved by the present invention is to provide a method and apparatus for constructing a status report to save data transmission bandwidth.

 In order to solve the above technical problem, the present invention provides a method for constructing a status report, which is applied to a radio link control layer protocol entity, and includes:

 If the received protocol data unit (PDU) is parsed with a polling flag, or the local reordering timeout expires, the minimum sequence number and the maximum sequence number of the PDU that are not completely received are obtained;

 If it is determined that the number of PDUs not completely received between the maximum sequence number and the minimum sequence number of the incompletely received PDU is greater than a predetermined number, the minimum sequence number and the maximum number of the PDUs that are not completely received are The unacknowledged response information of the predetermined number of PDUs that are not completely received is obtained between the serial numbers, and is used to construct a state 4 report.

 Optionally, the foregoing method further has the following feature: acquiring, between the minimum sequence number and the maximum sequence number of the PDU that is not completely received, the unacknowledged response information of the predetermined number of PDUs that are not completely received, The steps used to construct the status report include:

 Unconfirmed response information of the predetermined number of incompletely received PDUs is obtained in order from the smallest sequence number of the incompletely received PDUs for constructing the status report.

 Optionally, the foregoing method further has the following feature: acquiring, between the minimum sequence number and the maximum sequence number of the PDU that is not completely received, the unacknowledged response information of the predetermined number of PDUs that are not completely received, The steps for constructing the status report also include:

 Obtaining the sequence number of the next PDU of the corresponding maximum sequence number in the PDU that is not completely received as the acknowledgment response information for constructing the status report.

 Optionally, the foregoing method further has the following features: the PDU that is not completely received is: an unreceived PDU or a partially received PDU.

Optionally, the above method has the following features: If the PDU that is not completely received is a PDU that is not received, the unacknowledged response information is a sequence number corresponding to the unreceived PDU;

 If the PDU that is not completely received is a partially received PDU, the unacknowledged response information is a sequence number corresponding to the PDU received by the part and information indicating a start position and an end position of the unreceived part.

 In order to solve the above problem, the present invention further provides an apparatus for constructing a status report, which is applied to a radio link control layer protocol entity, including:

 Obtaining a module, configured to obtain a minimum sequence number and a maximum sequence number of the PDU that is not completely received if the received protocol data unit (PDU) is parsed with a polling flag bit, or the local reordering timing expires;

 The determining module is connected to the acquiring module, and the determining module is configured to: if it is determined that the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU that is not completely received is greater than a predetermined number, Then the message notification construction module;

 Constructing a module, connected to the determining module, the constructing module is configured to: after receiving the notification, obtain the predetermined number between the minimum serial number and the maximum serial number of the incompletely received PDU The unacknowledged response information of the received PDU is used to construct a status report.

 Optionally, the above device also has the following features:

 The constructing module is configured to acquire unconfirmed response information of the predetermined number of incompletely received PDUs in order from the smallest sequence number of the incompletely received PDU.

 Optionally, the above device also has the following features:

 The constructing module is further configured to: after acquiring the unacknowledged response information of the predetermined number of incompletely received PDUs, acquire the next PDU of the corresponding maximum sequence number of the predetermined number of incompletely received PDUs The serial number is used as a confirmation response message for constructing a status report.

 Optionally, the above device also has the following features:

The PDU that is not completely received is: a PDU that is not received or a PDU that is partially received. If the PDU that is not completely received is a PDU that is not received, the unacknowledged response information is that the acknowledgment is not received. Serial number corresponding to the PDU; If the PDU that is not completely received is a partially received PDU, the unacknowledged response information is a sequence number corresponding to the PDU received by the part and information indicating a start position and an end position of the unreceived part.

The present invention provides a method and apparatus for constructing a status report, which solves the LTE existing system

The RLC layer status report is insufficient in the construction process to improve the efficiency of the RLC status report, thereby saving the bandwidth of the wireless link. Compared with the existing state report construction method, the present invention has the following advantages: 1) saving data transmission bandwidth; 2) reducing repeated transmission of Nack information in the status report; 3) because Nack information is reduced in the status report, The complexity of the RLC transmitting side parsing status report is reduced; 4) the complexity of the RLC receiving side configuration status report is reduced. BRIEF abstract

 1 is a schematic diagram of an apparatus for constructing a state report according to an embodiment of the present invention;

 2 is a flowchart of a method for constructing a status report according to an embodiment of the present invention;

 3 is a flow chart of an application example of a method of constructing a status report of the present invention.

Preferred embodiment of the invention

 For a better understanding of the invention, the invention will be further described in conjunction with the drawings and specific embodiments.

 FIG. 1 is a schematic diagram of an apparatus for constructing a status report according to an embodiment of the present invention. The apparatus for constructing a status report in this embodiment is applied to an RLC protocol entity. As shown in FIG. 1, the method may include: an obtaining module 11, a determining module 12, and a constructing module. 13. among them,

 The obtaining module 11 is configured to: if the received PDU is parsed with a predetermined flag bit, or the local timing expires, obtain a minimum sequence number and a maximum sequence number of the PDU that is not completely received;

 The determining module 12 is connected to the obtaining module 11 and configured to: if it is determined that the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the incompletely received PDU is greater than a predetermined number, the message is Notification construction module 13;

a constructing module 13 , connected to the judging module 12, configured to receive the notification, in the The unconfirmed response information of the predetermined number of PDUs that are not completely received is obtained between the minimum sequence number of the PDU that is not completely received and the maximum sequence number, and is used to construct a status report.

 Specifically, the constructing module 13 acquires the unconfirmed response information of the predetermined number of incompletely received PDUs in order from the smallest sequence number of the incompletely received PDU, and may further acquire the reservation The sequence number of the next PDU of the corresponding maximum sequence number in the PDU that is not completely received is used as the acknowledgment response information for constructing the status report.

 The PDU that is not completely received may include: a PDU that is not received and a PDU that is partially received. If the PDU that is not completely received is a PDU that is not received, the constructing module 13 acquires the PDU that is not received. The PDU corresponding to the PDU is configured to construct a status report; if the PDU that is not completely received is a partially received PDU, the constructing module 13 obtains the sequence number corresponding to the PDU received by the part and the unreceived part of the tag. Information on the start and end positions to construct a status report.

 FIG. 2 is a flowchart of a method for constructing a status report according to an embodiment of the present invention. As shown in the figure, the method in this embodiment includes the following steps:

 S10. Analyze whether the received PDU has a polling flag, or determine whether the local rescheduling timing expires. If the PDU has a polling flag, or the local rescheduling timing expires, then go to step S20, if the PDU is not carried. If the flag bit is queried and the local timing has not expired, the PDU is always received, and step S10 is repeated.

 For example, the RLC receiving side receives the PDU with the Poling bit sent by the peer end, that is, the Polling flag bit in the parsing PDU is 1, which triggers the RLC receiving side construction status report.

 After receiving a certain number of PDUs, the RLC receivers will sort the PDUs and deliver the PDUs to the upper layer in sequence. When the local t-Reordering timer expires, the RLC receiver will trigger the status report structure of the PDUs that are not received. .

 S20. Obtain a minimum sequence number and a maximum sequence number of the PDU that are not completely received.

 Specifically, the RLC receiving side acquires the protocol parameters VR(R) and VR(MS) of the local end.

 The VR(R) records the minimum sequence number of the PDU that was not completely received, and the VR (MS) records the maximum sequence number of the PDU that was not completely received.

S30. Determine whether the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU that are not completely received is greater than a predetermined number. If the number of PDUs is greater than the predetermined number, the process proceeds to step S40. If it is less than or equal to the predetermined number, then proceeds to step S50;

 Specifically, the RLC receiving side calculates the number of PDUs that are not completely received between VR(R) and VR(MS), NACK_NUM.

 The RLC receiving side judges whether NACK_NUM is greater than the maximum number of NACK information allowed per status report NACK_MAX.

 S40. Acquire unconfirmed response information of the predetermined number of incompletely received PDUs between the minimum sequence number and the maximum sequence number of the incompletely received PDU, for constructing a status report, and then proceed to step S60.

 Specifically, the RLC receiving side acquires NACK-MAX Nack information between VR(R) and VR(MS), and SN of the next PDU of the corresponding maximum sequence number in the NACK_MAX incompletely received PDUs Construct a status report as AckSn. Among them, AckSn indicates that in the status report, except for the PDU indicated by NackSn, the PDUs before AckSn have been received.

In step S40, the RLC receiving side can specifically obtain the unacknowledged response information of the NACK_MAX incompletely received PDUs with the smallest sequence number to construct a status report.

 For example, the unacknowledged response information of NACK-MAX PDUs that are not completely received is obtained in order from VR(R).

 For a PDU that is not received at all, only the Sn number of the PDU is required as NackSn; for a part of the received PDU, NackSn and the unstarted part's start position (Sostart) and end position (SoEnd) are required to construct the Nack information.

 S50. Use all unacknowledged response information between the minimum sequence number and the maximum sequence number of the incompletely received PDU to construct a status report, and then proceed to step S60.

 Specifically, the RLC receiving side reports all Nack information construction status between VR(R) and VR(MS), and uses the next sequence number of the sequence number of the VR (MS) record as AckSn (Acknowledgement Response Sequence Number). Construct state 4 obituary.

S60, send status report. The present invention will be further described in detail below by taking the status report configuration of the radio link control layer in the LTE system as an example.

 First set the scene as follows:

 The transmitting side of the RLC layer has sent 200 PDUs to the receiving side of the RLC layer, which is recorded as PDU-1 to PDU-200, and the serial number of the PDU is 1 -200.

 At the receiving side of the RLC layer, only the last packet of PDU-200 was received because of a link problem in the middle of the time. The VR (MS) protocol parameter at the receiving side is updated to 201. Assuming that PDU-0 is not received, the protocol parameter VR(R) is 0.

 The maximum number of NACK messages configured in the background is 20.

 As shown in Figure 3, the specific steps of the RLC layer retransmission data construction are as follows:

 5100. The receiving side of the RLC receives the PDU, and the Polling flag in the PDU is 1 or the retake timer expires.

 5101. The RLC receiving side obtains the protocol parameter VR(R) is 0, and VR(MS) is 201.

 5102. RLC receiving side calculation The number of PDUs not received between VR(R) and VR(MS) is, for example, 199.

 5103. The RLC receiving side determines that the number of PDUs not received is greater than the maximum number of NACKs allowed in the status report configured in the background.

 5104. The RLC layer receiving side obtains a NACK information construction status report of the 20 unreceived PDUs (l-20) with the smallest SN number, and constructs a status report by using SN (21) as an ACK_SN.

 S105. The RLC layer receiving side sends a status report to the transmitting side of the RLC layer.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software. The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial Applicability The present invention provides a method and apparatus for constructing a status report, which saves data transmission bandwidth by:

 If the received protocol data unit (PDU) is parsed with a polling flag, or the local reordering timing expires, the minimum sequence number and the maximum sequence number of the PDU that are not completely received are obtained; The number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU is greater than a predetermined number, and the reservation is obtained between the minimum sequence number and the maximum sequence number of the incompletely received PDU. The unacknowledged response information of the PDUs that are not completely received is used to construct a status report.

 The method and device provided by the present invention solve the problem in the process of constructing the RLC layer status report in the existing LTE system, improve the efficiency of the RLC status report, and save the bandwidth of the wireless link.

2) Reducing the repeated transmission of Nack information in the status report; 3) Reducing the complexity of the RLC transmitting side parsing state due to the reduction of Nack information in the status report; 4) Reducing the RLC receiving side construction state The complexity of the report.

Claims

Claim  A method for constructing a state 4 notification, applied to a radio link control layer protocol entity, comprising: if parsing a received protocol data unit (PDU) with a polling flag bit, or if a local reordering timing expires, Obtain the minimum sequence number and the maximum sequence number of the PDU that is not completely received;  If it is determined that the number of PDUs not completely received between the maximum sequence number and the minimum sequence number of the incompletely received PDU is greater than a predetermined number, the minimum sequence number and the maximum number of the PDUs that are not completely received are The unconfirmed response information of the predetermined number of PDUs that are not completely received is obtained between the serial numbers for constructing a status report.  2. The method according to claim 1, wherein: the obtaining the predetermined number of the incompletely received PDUs between the minimum sequence number and the maximum sequence number of the incompletely received PDU Confirm response information, the steps used to construct the status report include:  The unconfirmed response information of the predetermined number of the incompletely received PDUs is obtained in order from the smallest sequence number of the incompletely received PDUs for constructing the status report.  3. The method according to claim 2, wherein: the obtaining the predetermined number of the incompletely received PDUs between the minimum sequence number and the maximum sequence number of the incompletely received PDU Confirmation response information, steps for constructing a status report, including:  Obtaining a sequence number of the next PDU of the predetermined maximum number of the incompletely received PDUs as the confirmation response information for constructing the status report.  4. The method of any of claims 1-3, wherein:  The PDUs that are not completely received are: unreceived PDUs or partially received PDUs.  5. The method of claim 4, wherein:  If the PDU that is not completely received is the unreceived PDU, the unacknowledged response information is a sequence number corresponding to the unreceived PDU;  If the PDU that is not completely received is the PDU received by the part, the unacknowledged response information is a sequence number corresponding to the PDU received by the part, and a start position and an end position of the unreceived part of the mark. information. 6. A device for constructing a state report, applied to a radio link control layer protocol entity, said Set includes:  Obtaining a module, configured to obtain a minimum sequence number and a maximum sequence number of the PDU that is not completely received if the received protocol data unit (PDU) is parsed with a polling flag bit, or the local reordering timing expires;  The determining module is connected to the acquiring module, and the determining module is configured to: if it is determined that the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU that is not completely received is greater than a predetermined number, Then the message notification construction module;  The constructing module is connected to the determining module, and the constructing module is configured to: after receiving the notification, obtain the predetermined number between a minimum serial number and a maximum serial number of the incompletely received PDU The unacknowledged response information of the PDU that is not completely received is used to construct a status report.  7. Apparatus according to claim 6 wherein:  The constructing module is configured to acquire unconfirmed response information of the predetermined number of the incompletely received PDUs in order from a minimum sequence number of the incompletely received PDU.  8. Apparatus according to claim 7 wherein:  The constructing module is further configured to: after obtaining the unacknowledged response information of the predetermined number of the incompletely received PDUs, acquire a corresponding maximum sequence number of the predetermined number of the incompletely received PDUs The serial number of the next PDU is used as the confirmation response information for constructing the status report.  9. Apparatus according to any of claims 6-8, wherein:  The PDU that is not completely received is: an unreceived PDU or a partially received PDU. If the PDU that is not completely received is the unreceived PDU, the unacknowledged response information is the unrecognized The serial number corresponding to the received PDU;  If the PDU that is not completely received is the PDU received by the part, the unacknowledged response information is a sequence number corresponding to the PDU received by the part, and a start position and an end position of the unreceived part of the mark. information.