WO2015196566A1

WO2015196566A1 - Method and apparatus for detecting faulty data in radio link control layer

Info

Publication number: WO2015196566A1
Application number: PCT/CN2014/086037
Authority: WO
Inventors: 韩虎贲
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2014-06-27
Filing date: 2014-09-05
Publication date: 2015-12-30
Also published as: CN105227264B; CN105227264A

Abstract

Disclosed is a method for detecting faulty data in a radio link control layer, comprising: respectively performing, by a receiving end, modulus processing on a current receiving serial number and a maximum receiving serial number; also performing a first threshold value estimation on the current receiving serial number and the maximum receiving serial number; comparing a difference value of the current receiving serial number and the maximum receiving serial number after modulus processing with a first threshold value; and when determining that the difference value after the modulus processing is greater than the first threshold value, determining data corresponding to the current receiving serial number as faulty data. Also disclosed is an apparatus for detecting faulty data in a radio link control layer.

Description

Radio link control layer error data detecting method and device

Technical field

The present invention relates to data detection technology, and in particular, to a wireless link control layer error data detection method and apparatus.

Background technique

With the continuous improvement of data traffic under the Long Term Evolution (LTE) system, the efficiency of data construction and transmission is constantly higher. In the process, exceptions such as build and send may occur. The possibility of sending erroneous data.

At present, data transmission is mainly implemented in three layers: a medium access control layer (MAC), a packet data aggregation layer (PDCP), and a radio link control layer (RLC), wherein a radio link control layer RLC passes data number and The window mechanism ensures the legal and orderly transmission of data. Under normal transmission, the window and data number (SN) of the sender and receiver are synchronized.

However, the transmission of erroneous data is always difficult to avoid. Once there is erroneous data generated, there is no effective detection and processing scheme for the error on the existing RLC protocol, and only the error accumulation can be waited for the final trigger to reconstruct the data link. Therefore, The transmitting and receiving parties will maintain a failed data connection for a long time until the entire data connection cannot be maintained, and the link is terminated when the conditions for abnormal release are satisfied. This long-term invalid link greatly reduces the efficiency and reliability of data service transmission under the LTE standard. Sex.

Summary of the invention

In order to solve the existing technical problems, the embodiments of the present invention mainly provide a radio link control layer error data detecting method and apparatus.

The technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a method for detecting an error data of a radio link control layer, where the method includes: performing a modulo processing on a current receiving sequence number and a maximum receiving sequence number, and performing a first threshold on a current receiving sequence number and a maximum receiving sequence number. Estimating, comparing the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing is compared with the first threshold, and determining that the data corresponding to the current receiving sequence number is determined when the difference after determining the modulo processing is greater than the first threshold Wrong data.

An embodiment of the present invention provides a radio link control layer error data detecting apparatus, where the apparatus includes: a first modulo processing module, a first threshold determining module, and a first judging module;

The first modulo processing module is configured to perform modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively, and send the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing to the first determining module;

The first threshold determining module is configured to perform a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number, and send the estimated first threshold value to the first determining module;

The first judging module is configured to compare the difference between the current receiving sequence number and the maximum receiving sequence number received by the first modulo processing module and the first threshold value sent by the first threshold determining module, where When it is determined that the difference after the modulo processing is greater than the first threshold, determining that the data corresponding to the current receiving sequence number is erroneous data.

The embodiment of the invention provides a wireless link control layer error data detecting method and device, and the receiving end performs modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively, and performs a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number. And comparing the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing is compared with the first threshold, and determining that the data corresponding to the current receiving sequence number is an error when determining that the difference value after the modulo processing is greater than the first threshold Data; in this way, erroneous data can be detected as soon as possible so that it can be corrected in time to enable the data to be sent and received normally; and the data transmission accuracy rate is improved.

DRAWINGS

1 is a schematic flowchart of a method for detecting an error data of an RLC layer according to the present invention;

2 is a schematic flowchart of a method for detecting an error data of a receiving end of an RLC layer according to the present invention;

3 is a schematic flowchart of a method for detecting an error data of a transmitting end of an RLC layer according to the present invention;

4 is a schematic structural diagram of an apparatus for detecting an error of an RLC layer according to the present invention;

FIG. 5 is a schematic structural diagram of another RLC layer error data detecting apparatus according to the present invention.

detailed description

In the embodiment of the present invention, the receiving end performs modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively, and performs a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number, and the current receiving sequence number and the maximum receiving sequence number after the modulo processing is performed. The difference is compared with the first threshold. When the difference after determining the modulo processing is greater than the first threshold, determining that the data corresponding to the current receiving sequence number is erroneous data.

In the RLC protocol, in the acknowledgment (AM) mode, the hybrid automatic repeat request (HARQ) mechanism is used to ensure complete data transmission. The HARQ mechanism requires the user equipment (UE) and the network side to respectively report the status report to the other party. Require the other party to resend the data that has not been completely received, and continuously correct the feedback to synchronize the data between the sender and the receiver. However, in the non-acknowledgment (UM) mode, there is no HARQ mechanism, and only the data can be correctly transmitted to ensure the data synchronization between the sender and the receiver. . The error data is not the actual data to be sent by the sender, it may be old data, or incomplete data. Once the error data is processed by the receiving end as normal data, the window maintained by the receiving end will slide abnormally, resulting in non-synchronization with the sending end, so that the receiving end will temporarily process the original correct data, and even discard it when it is serious. In the AM mode, the receiving end will feed back an abnormal status packet, which cannot be processed normally by the transmitting end. Therefore, the ARQ mechanism will completely lose its effect, and the data link cannot perform effective data communication.

The embodiment of the invention is mainly based on the data coding and window mechanism of the RLC protocol, and can quickly detect errors, timely correct errors, and ensure correct, orderly and complete transmission of data when error data occurs.

The invention will be further described in detail below with reference to the drawings and specific embodiments.

The embodiment of the invention implements a flow of the RLC layer error data detecting method. As shown in FIG. 1 , the method mainly includes the following steps:

Step 101: The receiving end performs modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively.

Specifically, the receiving end numbers the window data by the serial number, and records the receiving serial number. Since the RLC window is cyclic, the current receiving serial number and the recorded maximum receiving serial number are respectively subjected to modulo processing before the subsequent numerical comparison can be performed;

Here, it should be noted that the receiving end numbers the window data by the serial number, and records the receiving serial number and the corresponding data. The encoding mode and the recording mode here are already defined in the RLC protocol, and are not described herein again.

Step 102: The receiving end performs a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number.

Specifically, the subframe number of the data corresponding to the largest received sequence number is found; the current receiving sequence number SN=x is received, and the subframe number of the data corresponding to x is recorded; and then the subframe number and the maximum of the data corresponding to the current receiving sequence number x are received. The first frame value estimation is performed by receiving the subframe number of the serial number corresponding data.

Step 103: The receiving end compares the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing is compared with the first threshold.

Here, the value after the modulo processing is the same as the first threshold, so that the size comparison can be performed.

Step 104: When it is determined that the difference after the modulo processing is greater than the first threshold, determine that the data corresponding to the current receiving sequence number is erroneous data;

Specifically, after determining that the data corresponding to the current receiving sequence number SN=x is error data, the correcting mechanism is started, the error data is discarded, and the window variable of the receiving end is not updated to keep the window synchronized with the sending window.

Because of the UM mode and the AM mode, the erroneous data detection mode of the present invention is divided into: receiving end detection and transmitting end detection, wherein in the UM mode, only the receiving end detects; in the AM mode, in addition to the receiving end detecting, Increase the sender detection; in both detection modes, the correction of the error data is performed at the receiving end.

The process of implementing the RLC layer receiving end error data detecting method is as shown in FIG. 2, and the method mainly includes the following steps:

Step 201: The receiving end records the maximum receiving sequence number, and records the subframe number of the data corresponding to the maximum receiving sequence number;

Specifically, the maximum receiving sequence number is Vrh, and the subframe number of the data corresponding to the maximum receiving sequence number Vrh is recorded as sf1;

Here, since the receiving end numbers the window data and records the receiving serial number SN, the receiving serial numbers are in one-to-one correspondence with the window data.

Step 202: The receiving end records the current receiving sequence number, and records the subframe number of the current receiving sequence corresponding data.

Specifically, the current receiving sequence number is SN=x, and the subframe number of the data corresponding to the current receiving sequence number x is recorded as sf2.

Step 203: Determine whether the current receiving serial number is within the receiving end window; if yes, proceed to step 204, otherwise, proceed to step 208;

Here, the receiving end determines whether the current receiving sequence number is within the receiving end window, and compares the current receiving sequence number SN=x with the maximum receiving sequence number Vrh and the receiving terminal minimum acknowledgement sequence number Vrr, if the current receiving sequence number SN=x is at the maximum receiving sequence number. Between Vrh and the minimum acknowledgement sequence number Vrr of the receiving end, the current receiving sequence number SN=x is within the receiving end window; otherwise, the current receiving sequence number SN=x is not within the receiving end window.

Step 204: The receiving end performs modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively.

Specifically, the receiving end performs modulo processing on the current receiving sequence number SN=x and the maximum receiving sequence number Vrh respectively, and the specific mode is:

MOD_x=(x+Modulus–Base)%Modulus;

MOD_Vrh=(Vrh+Modulus–Base)%Modulus;

UM mode: Base=(Vrh+Modulus-Win)%Modulus;

AM mode: Base=Vrr;

Among them, MOD_x is the modulus data of the current receiving serial number, MOD_Vrh is the modulus data of the maximum receiving serial number, x is the current receiving serial number, Vrh is the maximum receiving serial number, Vrr is the minimum acknowledged serial number of the receiving end, Win is the window size, and Modulus is the window. 2 times the size.

Step 205: The receiving end performs a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number.

Specifically, the receiving end receives the current receiving sequence number SN=x, and records the subframe number sf2 of the x corresponding data; finds the subframe number sf1 of the data corresponding to the recorded maximum receiving sequence number Vrh; and then performs the first threshold according to sf1 and sf2. Estimate,

Here, if the first threshold is Y1, then Y1=(sf2-sf1)*TB* mode coefficient, where TB is the number of data transmission blocks, and the mode coefficient is the number of uplink subframes or the number of downlink subframes and the total number of subframes. ratio;

Here, the mode coefficients are different in the time division multiplexing (TDD) system and the frequency division multiplexing (FDD) system. In the TDD system, different subframe ratios determine the number of subframes used for uplink and downlink, for example, When the ratio 1 is 1:7, the number of uplink subframes is determined to be 4, and the number of downlink subframes is 6. When the ratio 2 is 2:7, the number of uplink subframes is determined to be 2, and the number of downlink subframes is 8; the mode coefficient is the ratio of the number of uplink subframes or the number of downlink subframes to the total number of subframes. The ratio of the first ratio to the ratio of the two subframes is 10 (1 frame contains 10 subframes), and if it is uplink, The mode factor is 4/10 or 2/10, and if it is down, the mode factor is 6/10 or 8/10;

In the FDD system, the total number of subframes is 10, the number of uplink subframes is 10, and the number of downlink subframes is also 10. If the uplink or downlink is used, the mode coefficients are all 10/10=1. Therefore, in the FDD system, the mode is The coefficient is 1;

It can be seen from the above reasoning that under the above two modes of TDD and FDD, the maximum mode coefficient is 1.

Step 206: The receiving end determines whether the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing is greater than the first threshold, and if yes, proceeds to step 207, otherwise, proceeds to step 208;

Here, the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing is set is Q1.

Q1=(MOD_x+Modulus-MOD_Vrh)%Modulus, the difference Q1 is compared with the first threshold Y1 described above.

Step 207: Determine that the data corresponding to the current receiving sequence number is error data, and perform error correction processing.

Here, when the receiving end determines that the difference value after the modulo processing is greater than the first threshold, determining that the data corresponding to the current receiving sequence number is erroneous data, performing correction processing, that is, discarding data corresponding to the current receiving sequence number, and not updating the window of the receiving end variable.

Step 208: Determine that the data corresponding to the current receiving sequence number is legal data, and perform normal processing.

Here, when the receiving end determines that the difference after the modulo processing is less than or equal to the first threshold, it is determined that the data corresponding to the current receiving sequence number SN=x is legal data, and the data corresponding to the current receiving sequence number is normally processed.

It should be noted that when the receiving end fails to completely detect the erroneous data, it will feed back a status packet to the transmitting end to start the transmitting end detection, and the transmitting end further detects the erroneous data according to the status packet fed back by the receiving end, and specifically implements the RLC layer transmitting end. The flow of the error data detection method is shown in FIG. 3, and the method mainly includes the following steps:

Step 301: The transmitting end receives the status packet fed back by the receiving end.

Here, the status packet carries the window information of the receiving end, and the window information of the receiving end includes: receiving the sequence number ACK_SN (hereinafter referred to as the acknowledgement sequence number), not receiving the sequence number NACK_SN, and not receiving the segmentation information of the data corresponding to the sequence number, these windows The information has been specified in the RLC protocol. In brief, the receiving end feeds back to the transmitting end which receiving sequence number SN has been received, and which receiving sequence number SN has not received, and the ACK_SN can be the upper limit of the receiving sequence number received by the receiving end, and the transmitting end receives After the status packet, the ACK_SN is forwarded, and the receiving sequence number SN received by the receiving end is released, and no retransmission is received; of course, the ACK_SN may be included in the receiving window, and the setting of the ACK_SN is in the RLC protocol. Provisions.

Step 302: Determine whether the confirmed sequence number of the received status packet is within the window of the sending end, such as If not, proceed to step 303; if yes, proceed to step 307;

Specifically, the sender determines whether the acknowledgement number ACK_SN of the status packet is within the window of the sender, and compares the acknowledgement number ACK_SN with the maximum transmission sequence number Vts of the sender and the maximum transmission sequence number Vta of the continuous acknowledgement, if the acknowledge sequence number ACK_SN is at the maximum transmission sequence number. Between Vts and the continuously transmitted maximum transmission sequence number Vta, the confirmation sequence number ACK_SN is within the sender window; otherwise, the confirmation sequence number ACK_SN is not within the sender window;

It should be noted that the sending end also numbers the window data, and the set numbers correspond to the data of the sending end window one by one.

Step 303: The transmitting end performs a modulo processing on the confirmation serial number and the maximum transmission serial number continuously confirmed.

Specifically, the sending end performs a modulo processing on the acknowledgment serial number and the maximum acknowledgment maximum transmission sequence, respectively, including: MOD_Vta=(Vta+1024-Base)%1024;

MOD_ACK_SN=(ACK_SN+1024-Base)%1024;

AM:Base=Vta;

Where MOD_Vta is the modulo data of the maximum transmission sequence number continuously confirmed, MOD_ACK_SN is the modulo data of the acknowledgment number, Vta is the maximum transmission sequence number of consecutive acknowledgments, and ACK_SN is the acknowledgment sequence number;

Here, the RLC protocol specifies that: Vts is the maximum transmission sequence number of the sender, indicating the next sequence number to be transmitted; Vta is the maximum transmission sequence number for continuous acknowledgement, indicating that the receiver is acknowledged by the receiver and is continuously acknowledged by the receiver. A serial number. For example, if the sending end sends the sequence number to 1, 2, 3, and 4, and the receiving end receives the sequence number 1, 2, and 4, the serial number received continuously is 1, 2, and the serial number of consecutive serial numbers is 2, which is to be received. The serial number is 3, and the next serial number of the largest serial number that is continuously confirmed is 3, and the maximum transmission serial number Vta=3 is continuously confirmed. In this example, the next serial number to be transmitted is 5, and the maximum transmission serial number Vts=5. Vta is included in Vts.

Step 304: The sender judges the acknowledgment number after modulo and the maximum transmission sequence number that is continuously confirmed. Whether the difference is less than the second threshold, if not, proceeds to step 305, and if yes, proceeds to step 307;

Here, the difference between the acknowledgment number after the modulo processing and the maximum transmission number that is continuously confirmed is Q2.

Q2=(MOD_Vta+1024-MOD_ACK_SN)%1024, comparing Q2 with a second threshold Y2, wherein the second threshold Y2=the ratio of the maximum HARQ retransmission time to the status packet transmission interval time, wherein the status packet transmission interval The time is obtained according to the preset configuration. The maximum HARQ retransmission time=retransmission times* each retransmission time, wherein the number of retransmissions and each retransmission time are obtained according to a preset configuration.

Step 305: determining that the data corresponding to the confirmation serial number is generated by the receiving end processing the error data, and feeding back the window variable to the receiving end;

Specifically, when the sending end determines that the difference after the modulo is greater than or equal to the second threshold, it may be determined that the data corresponding to the currently received acknowledgement sequence ACK_SN is generated by the receiving end processing error data, and the feedback window variable is sent to the receiving end, the window. The variables are: the maximum transmission sequence number Vta and the maximum transmission sequence number Vts that are continuously confirmed;

Here, the control information of the control data type (CPT) needs to be constructed. Currently, the CPT control information of the RLC protocol has only one format, that is, the state packet of CPT=0. Therefore, the present invention can expand the CPT control information and add a CPT=1. The control information carries the continuously transmitted maximum transmission sequence number Vta and the maximum transmission sequence number Vts to the receiving end.

Step 306: The receiving end performs error correction processing according to the received window variable.

Specifically, after receiving the window variable fed back by the sending end, the receiving end corrects the receiving window according to the received window variable, and discards the error data;

Here, the receiving end compares its own maximum receiving sequence number Vrh, that is, the right edge of the receiving end window, and the maximum transmitting sequence number Vts of the transmitting end, and selects the smaller one of the maximum receiving sequence number Vrh and the maximum transmitting sequence number Vts; The receiving end compares the receiving end minimum confirmation sequence number Vrr, that is, the left edge of the receiving end window, and compares the continuously confirmed maximum transmission sequence number Vta, and selects both. The larger, two-choice two-window window is the window that needs to be corrected. The data in the window is the wrong data, and the error data in the window is discarded.

Step 307: Determine that the data corresponding to the acknowledgement sequence number is generated by the HARQ retransmission, and discard the state packet.

Here, when it is determined that the difference after the modulo processing is greater than the second threshold, it may be determined that the data corresponding to the acknowledgment number ACK_SN is generated by the HARQ retransmission, and the received status packet is discarded, and the current round of processing ends.

In order to implement the above method, the embodiment of the present invention further provides an apparatus for detecting an error of the RLC layer. As shown in FIG. 4, the apparatus includes: a first recording module 41, a first modulo processing module 42, and a first threshold determining module. 43. The first determining module 44; wherein

The first recording module 41 can be implemented by a memory, configured to record the serial number of the receiving end window, and record the subframe number of the data corresponding to the window serial number;

Specifically, the first recording module 41 is configured to record the maximum receiving sequence number Vrh, and record the subframe number sf1 of the data corresponding to the maximum receiving sequence number; and further configured to record the current receiving sequence number SN=x, and record the current receiving sequence corresponding data. Frame number sf2;

It should be noted that, since the receiving end numbers the window data and records the receiving sequence number SN, the receiving sequence number SN is respectively corresponding to the window data, so the first recording module 41 records each receiving sequence number SN, and records each The subframe number of the data corresponding to the sequence number SN is received.

The first modulo processing module 42 is implemented by a processor (CPU), configured to perform modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively, and send the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing to First determining module;

Specifically, the first modulo processing module 42 is configured to perform modulo processing on the current receiving sequence number SN=x and the maximum receiving sequence number Vrh respectively, including:

MOD_x=(x+Modulus–Base)%Modulus;

MOD_Vrh=(Vrh+Modulus–Base)%Modulus;

UM mode: Base=(Vrh+Modulus-Win)%Modulus;

AM mode: Base=Vrr;

MOD_x is the modulo data of the current receiving sequence number, MOD_Vrh is the modulo data of the maximum receiving sequence number, x is the current receiving sequence number, Vrh is the maximum receiving sequence number, Vrr is the minimum acknowledgment number of the receiving end Win is the window size, and Modulus is the window size 2 Times.

The first threshold determining module 43 may be implemented by a processor (CPU), configured to perform a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number, and send the estimated first threshold value to the first determining module 44;

Specifically, the first threshold determining module 43 is configured to receive the current receiving sequence number SN=x, and record the subframe number sf2 of the x corresponding data; and find the subframe number sf1 of the data corresponding to the recorded maximum receiving sequence number Vrh; Sf1, sf2 perform the first threshold Y1 estimation, the first threshold Y1 = (sf2 - sf1) * TB * mode coefficient; TB is the number of data transmission blocks; the mode coefficient is the number of uplink subframes or the number of downlink subframes and the total number of subframes The ratio.

The first determining module 44 is implemented by the comparator, configured to determine whether the receiving sequence number is within the receiving window, and send the subframe number of the data corresponding to the receiving sequence number and the receiving sequence number to the first when the receiving sequence number is within the receiving window. The modulo processing module 42;

Specifically, the first determining module 44 is configured to compare the current receiving sequence number SN=x with the maximum receiving sequence number Vrh and the receiving terminal minimum acknowledgement sequence number Vrr, if the current receiving sequence number SN=x is at the maximum receiving sequence number Vrh and the receiving terminal minimum acknowledgement Between the sequence numbers Vrr, the current receiving sequence number SN=x is within the receiving end window; otherwise, the current receiving sequence number SN=x is not within the receiving end window; when it is determined that the current receiving sequence number SN=x is in the receiving end window, it will receive The sequence number SN=x, and the subframe number sf2 of the x corresponding data are sent to the first modulo processing module 42.

The first judging module 44 is further configured to receive the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing sent by the first modulo processing module 42 and the first threshold value sent by the first threshold determining module 43. Comparing, when it is determined that the difference after the modulo processing is greater than the first threshold, Determining that the data corresponding to the current receiving serial number is error data;

Q1=(MOD_x+Modulus-MOD_Vrh)%Modulus, compares the difference Q1 with the first threshold Y1, and determines the current receiving sequence number SN when the difference after determining the modulo processing is greater than the first threshold. The data corresponding to =x is the wrong data.

The device further includes: a first error data processing module 45, configured to receive the current receiving sequence number sent by the first determining module 44, and discard the data corresponding to the current receiving sequence number;

Correspondingly, the first determining module 44 is further configured to send the current receiving sequence number to the first erroneous data processing module 45 after determining that the data corresponding to the current receiving sequence number is erroneous data.

The first error data processing module 45 can be implemented by a processor (CPU), and is further configured to modify the receiving window according to the received window variable sent by the sending end, and discard the error data;

Specifically, the first erroneous data processing module 45 is configured to compare the maximum receiving sequence number Vrh of the receiving end, that is, the right edge of the receiving end window, and the maximum sending sequence number Vts of the transmitting end, and select two of the maximum receiving sequence number Vrh and the maximum sending sequence number Vts. The smaller one of the variables; the same reason is to receive the minimum acknowledgement sequence number Vrr, that is, the left edge of the receiving end window, and compare it with the continuously confirmed maximum transmission sequence number Vta, select the larger of the two; The window formed by the variable is the window that needs to be corrected. The data in the window is the wrong data, and the error data in the window is discarded.

In addition, the apparatus further includes: the status packet feedback module 46 can be implemented by a main chip having a communication function, configured to feed back the status packet to the transmitting end.

As shown in FIG. 5, the device further includes: a second determining module 51 and a second modulo processing module 52; wherein

The second judging module 51 is implemented by the comparator, configured to receive the status packet sent by the receiving end, and determine that the confirmed sequence number in the received status packet is not within the window range of the sending end, and send the confirmation sequence number to the second modulo processing module. 52;

Specifically, the second determining module 51 is configured to compare the acknowledgement number ACK_SN with the maximum transmission sequence number Vts of the transmitting end and the maximum transmission number Vta of the continuous acknowledgement, and if the acknowledgement sequence number ACK_SN is at the maximum transmission sequence number Vts and the maximum transmission sequence number of the continuous acknowledgement Between Vta, the confirmation sequence number ACK_SN is within the sender window, otherwise, the confirmation sequence number ACK_SN is not within the sender window.

The second judging module 51 is further configured to compare the difference between the modulo processing modulo sequence sent by the second modulo processing module 52 and the continuously confirmed maximum transmission sequence number with the second threshold value,

Here, the difference between the acknowledgment number after the modulo and the maximum acknowledgment of the maximum acknowledgment is Q2, Q2=(MOD_Vta+1024-MOD_ACK_SN)%1024, and Q2 is compared with the second threshold Y2, where Y2=the maximum HARQ weight The ratio of the transmission time to the status packet transmission interval, wherein the status packet transmission interval is obtained according to the preset configuration, the maximum HARQ retransmission time = the number of retransmissions * each retransmission time, wherein the number of retransmissions, each retransmission The time is obtained according to the preset configuration;

After the difference Q2 after the modulo processing is confirmed to be greater than or equal to the second threshold Y2, it is determined that the data corresponding to the confirmation serial number is generated by the receiving end processing error data, and the feedback window variable is sent to the receiving end; here, the feedback The window variable is the maximum transmission sequence number Vta and the maximum transmission sequence number Vts that are continuously confirmed.

Specifically, the second determining module 51 is configured to determine, when the difference Q2 after the modulo is greater than or equal to the second threshold Y2, that the acknowledgement sequence ACK_SN is generated by the receiving end processing error data, and construct the control data type. (CPT) control information;

Here, the CPT control information of the current RLC protocol has only one format, that is, a state packet of CPT=0. Here, by expanding the CPT control information, a control information of CPT=1 is added, and the control information carries the maximum transmission of consecutive acknowledgements. The serial number Vta and the maximum transmission sequence number Vts are sent to the receiving end, and the carried Vta and Vts are fed back to the receiving end.

The second modulo processing module 52 can be implemented by the CPU, configured to perform modulo processing on the acknowledgment serial number sent by the second judging module 51 and the maximum sequel to the continuous acknowledgment, respectively. The difference between the processed confirmation number and the continuously confirmed maximum transmission sequence number is sent to the second determination module 51;

Specifically, the second modulo processing module 52 is configured to perform modulo processing on the acknowledgment serial number ACK_SN and the continuously confirmed maximum transmission sequence number Vta, respectively, including:

MOD_Vta=(Vta+1024-Base)%1024;

MOD_ACK_SN=(ACK_SN+1024-Base)%1024;

AM mode: Base=Vta;

Where MOD_Vta is the modulus data of the maximum transmission sequence continuously confirmed, MOD_ACK_SN is the modulus data of the acknowledgment number, Vta is the maximum transmission sequence number of consecutive acknowledgments, and ACK_SN is the acknowledgment sequence number.

The first recording module 41, the first modulo processing module 42, the first threshold determining module 43, the first determining module 44, the first erroneous data processing module 45, and the status packet feedback module 46 may be disposed in a network serving as a receiving end. The second recording module 51 and the second modulo processing module 52 may be disposed at a network node serving as a transmitting end. When the network node serves as both a receiving end and a transmitting end, the first recording module 41 and the first The modulo processing module 42, the first threshold determining module 43, the first determining module 44, the first erroneous data processing module 45, the state packet feedback module 46, the second judging module 51, and the second modulo processing module 52 can be simultaneously set. On the network node, but when the network node is used as the receiving end, the first recording module 41, the first modulo processing module 42, the first threshold determining module 43, the first determining module 44, The first error data processing module 45 and the state packet feedback module 46, when the network node is used as the transmitting end, enable the second determining module 51 and the second modulo processing module 52, the network node Be a mobile terminal or a base station or router.

In summary, the present invention performs modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively by the receiving end, and performs a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number, and the current receiving sequence number and maximum after the modulo processing. The difference of the received sequence number is compared with the first threshold, After determining that the difference after the modulo processing is greater than the first threshold, determining that the data corresponding to the current receiving sequence number is erroneous data; thus, the erroneous data can be detected as soon as possible, so that the data can be correctly sent and received in time; and the data is improved at the same time. Transmission accuracy rate.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in Within the scope of protection of the present invention.

Industrial applicability

According to various embodiments of the present invention, the receiving end compares the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing is compared with the first threshold, and when the difference after determining the modulo processing is greater than the first threshold, The data corresponding to the current receiving serial number is determined to be erroneous data, and the erroneous data can be detected as soon as possible so as to be corrected in time, so that the data can be sent and received normally, and the data transmission correct rate is improved.

Claims

A wireless link control layer error data detecting method, the method comprising:

The receiving end performs modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively, and performs a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number, and compares the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing. The threshold is compared. When the difference after determining the modulo processing is greater than the first threshold, determining that the data corresponding to the current receiving sequence number is erroneous data.
The method of claim 1, wherein the performing modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively comprises:

MOD_x=(x+Modulus-Base)%Modulus;

MOD_Vrh=(Vrh+Modulus–Base)%Modulus;

Non-confirmed UM mode: Base=(Vrh+Modulus-Win)%Modulus;

Confirm AM mode: Base=Vrr;

MOD_x is the modulus data of the current receiving serial number, MOD_Vrh is the modulus data of the maximum receiving serial number, x is the current receiving serial number, Vrh is the maximum receiving serial number, Vrr is the minimum acknowledged serial number of the receiving end, Win is the receiving end window size, and Modulus is the receiving The end window is 2 times the size.
The method according to claim 2, wherein said first threshold estimation of said current receiving sequence number and said maximum receiving sequence number is: said first threshold value = (sf2 - sf1) * TB * mode coefficient, wherein sf2 is maximum The sub-frame number of the data corresponding to the serial number is received, sf1 is the sub-frame number of the data corresponding to the current receiving sequence number, TB is the number of data transmission blocks, and the mode coefficient is the ratio of the number of uplink sub-frames or the number of downlink sub-frames to the total number of sub-frames.
The method of claim 3, wherein comparing the difference between the current received sequence number and the maximum received sequence number after the modulo processing is compared with the first threshold comprises:

Compare (MOD_x+Modulus-MOD_Vrh) whether %Modulus is greater than the first threshold.
The method according to any one of claims 1 to 4, wherein the method further comprises: the transmitting end detecting the erroneous data by the status packet fed back by the receiving end.
The method of claim 5, wherein detecting, by the transmitting end, the error data by the status packet fed back by the receiving end comprises:

The transmitting end determines that the confirmed sequence number in the received status packet is not within the window range of the transmitting end, and performs modulo processing on the acknowledgment serial number and the maximum acknowledgment maximum transmission sequence number respectively, and the acknowledgment number after the modulo processing and the maximum transmission of the continuous acknowledgment The difference between the sequence number and the second threshold is compared. When the difference between the modulo processing is determined to be greater than or equal to the second threshold, determining that the data corresponding to the acknowledgement sequence is generated by the receiving end processing error data, and the feedback sender The window variable is given to the receiving end.
The method according to claim 6, wherein the method further comprises: after receiving the window variable fed back by the transmitting end, the receiving end corrects the receiving window according to the received window variable, and discards the erroneous data.
The method according to claim 6, wherein the method further comprises: determining that the data corresponding to the confirmation sequence number is generated by the hybrid automatic repeat request HARQ retransmission when determining that the difference value after the modulo processing is less than the second threshold , discard the status packet.
The method of claim 6, wherein the performing the modulo processing on the confirmation serial number and the continuously transmitted maximum transmission serial number respectively comprises:

MOD_Vta=(Vta+1024-Base)%1024;

MOD_ACK_SN=(ACK_SN+1024-Base)%1024;

AM:Base=Vta;

Where MOD_Vta is the modulus data of the maximum transmission sequence continuously confirmed, MOD_ACK_SN is the modulus data of the acknowledgment number, Vta is the maximum transmission sequence number of consecutive acknowledgments, and ACK_SN is the acknowledgment sequence number.
The method according to claim 9, wherein said comparing the difference between the modulo processing number and the continuously confirmed maximum transmission number to the second threshold is:

Compare (MOD_Vta+1024-MOD_ACK_SN)%1024 is greater than or equal to the second Threshold.
The method of claim 6 wherein said second threshold is estimated by a ratio of a maximum HARQ retransmission time to a status packet transmission interval.
The method according to claim 6, wherein said determining that the confirmation sequence number in the received status packet is not within the window range of the transmitting end comprises: determining whether the confirmation sequence number is at the sender's maximum transmission sequence number and the continuously acknowledged maximum transmission sequence number. If not, the confirmation sequence number is not within the window of the sender.
A radio link control layer error data detecting apparatus, comprising: a first modulo processing module, a first threshold determining module, and a first judging module;

The first modulo processing module is configured to perform modulo processing on the current receiving sequence number and the maximum receiving sequence number respectively, and send the difference between the current receiving sequence number and the maximum receiving sequence number after the modulo processing to the first determining module;

The first threshold determining module is configured to perform a first threshold estimation on the current receiving sequence number and the maximum receiving sequence number, and send the estimated first threshold value to the first determining module;

The first judging module is configured to compare the difference between the current receiving sequence number and the maximum receiving sequence number received by the first modulo processing module and the first threshold value sent by the first threshold determining module, where When it is determined that the difference after the modulo processing is greater than the first threshold, determining that the data corresponding to the current receiving sequence number is erroneous data.
The device of claim 13, wherein the device further comprises: a first error data processing module, configured to receive a current receiving sequence number sent by the first determining module, and discard the data corresponding to the current receiving sequence number;

Correspondingly, the first determining module is further configured to send the current receiving sequence number to the first erroneous data processing module after determining that the data corresponding to the current receiving sequence number is erroneous data.
The apparatus of claim 14, wherein the first erroneous data processing module is further configured to modify the receiving window according to the received window variable sent by the transmitting end, and discard the error data.
The apparatus of claim 15, wherein the apparatus further comprises: a status packet feedback module configured to feed back the status packet to the transmitting end.
The device of claim 16, wherein the device further comprises: a second judging module and a second modulo processing module; wherein

The second judging module is configured to receive the status packet sent by the receiving end, and determine that the confirmed sequence number in the received status packet is not within the window range of the sending end, and send the confirmation serial number to the second modulo processing module;

And configured to compare the difference between the modulo processing number received by the second modulo processing module and the maximum acknowledgment maximum transmission number with the second threshold, and the difference after confirming the modulo processing is greater than Or equal to the second threshold, determining that the data corresponding to the confirmation serial number is generated by the receiving end processing the error data, and feeding back the window variable of the sending end to the receiving end;

The second modulo processing module is configured to perform modulo processing on the acknowledgment serial number sent by the second judging module and the maximum sequel to the continuous acknowledgment, and the difference between the acknowledgment number after the modulo processing and the maximum transmitted serial number that is continuously confirmed. The value is sent to the second determination module.
The apparatus according to claim 17, wherein the second determining module is further configured to: when the difference after determining the modulo processing is less than the second threshold, determining that the data corresponding to the confirmation sequence number is generated by HARQ retransmission , discard the status packet.
The apparatus according to claim 18, wherein said first recording module, first modulo processing module, first threshold determining module, first determining module, first error data processing module, and state packet feedback module are disposed at a network node serving as a receiving end, the second determining module and the second modulo processing module are disposed at a network node serving as a transmitting end;

Or the first recording module, the first modulo processing module, the first threshold determining module, the first determining module, the first error data processing module, the state packet feedback module, the second determining module, and the second modulo processing The module is set on a network node, and when the network node is used as a receiving end, The first recording module, the first modulo processing module, the first threshold determining module, the first determining module, the first error data processing module, and the state packet feedback module are enabled, and when the network node is used as the transmitting end, the foregoing is enabled. The second judging module and the second modulo processing module.