KR102175799B1 - Blind detection system for physical downlink control channel based on 5g communication and method thereof - Google Patents

Abstract

The present invention relates to a PDCCH blind detection system and method based on 5G communication.
The detection method using the PDCCH blind detection system based on 5G communication according to the present invention includes the steps of a transmitting end generating 24-bit CRC parity according to PDCCH data and CRC key values, and inserting and combining the generated bits into the PDCCH data. The PDCCH data including a 24-bit CRC parity coupled to the PDCCH data by a transmitter and an RNTI value of a user terminal with an exclusive OR (XOR), and a 24-bit CRC parity and a 16-bit RNTI value by the transmitter Transmitting header information of, the receiving end receiving and decoding the header information to detect a part of the CRC parity inserted in the header information, and the receiving end comparing the 8-bit CRC parity with a predefined value, and the comparison result Acquiring DCI data according to the method, and extracting a final RNTI value by using the obtained DCI data by the receiving end and completing PDCCH blind detection.
As described above, according to the present invention, when the RNTI value of the user terminal and the number of user terminals are not determined in a 5G communication environment, it is possible to secure the accuracy of PDCCH blind detection by determining whether the RNTI value is reliable.

Description

5G communication-based PDCCH blind detection system and its method {BLIND DETECTION SYSTEM FOR PHYSICAL DOWNLINK CONTROL CHANNEL BASED ON 5G COMMUNICATION AND METHOD THEREOF}

The present invention relates to a PDCCH blind detection system and method thereof based on 5G communication, and more particularly, whether the reliability of the RNTI value when the RNTI (Radio Network Temprary Identifier) value of the user terminal and the number of user terminals are not determined in a 5G communication environment. The present invention relates to a PDCCH blind detection system based on 5G communication and a method thereof for securing accuracy of a physical downlink control channel (PDCCH) blind detection by determining the data.

Efforts have been made to develop an improved 5G (5th Generation) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of a 4G (4th Generation) communication system. For this reason, a 5G communication system or a pre-5G communication system is referred to as a'beyond 4G network communication system' or a'long Term Evolution (LTE) system'.

The 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, 60 GHz band) in order to achieve a higher data rate. In order to reduce the propagation loss of radio waves and increase the transmission distance, in 5G communication systems, beamforming, massive array multiple input/output (MIMO), full-dimensional multiple input/output (FDMIMO), array antennas, Analog beam forming, and large scale antenna techniques are being discussed.

In addition, in 5G communication systems, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, and device-to-device (D2D) are -Device) communication, wireless backhaul (wireless backhaul), mobile network, cooperative communication, CoMP (Coordinated Multi-Points), and technology development such as interference cancellation at the receiving end is being made.

In these 5G communication systems, advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), and advanced access technologies such as filter bank multi carrier (FBMC) and NOMA ( Non-orthogonal multiple access) and sparse code multiple access (SCMA) have been developed.

The information received by the PDCCH, which acts as an important factor affecting the system response rate by determining the delay by transmitting UL (Up Link) / DL (Down Link) control information of the overall 5G communication system, is a single or multiple users This is Downlink Control Information (DCI) including resource allocation and other control information in a user equipment (UE).

Typically, a plurality of PDCCHs may be included in one subframe. The user terminal can first decode the received DCI and decode the PDSCH (including physical downlink shared channel, broadcast message, paging, UE data, etc.) belonging to the user terminal at the corresponding resource location, which is called PDCCH blind detection. do. This is for the user terminal, but if the RNTI value of each user terminal is not determined, all RNTI (RNTI range is 1-65535) values must be calculated, resulting in a problem that the calculation time is too long.

The technology behind the present invention is disclosed in Korean Patent Application Publication No. 10-2015-0008184 (published on January 21, 2015).

The technical problem to be achieved by the present invention is a PDCCH blind detection system based on 5G communication for securing the accuracy of PDCCH blind detection by determining the reliability of the RNTI value when the user's RNTI value and the number of users are not determined in a 5G communication environment, and the same. It is to provide a way.

A detection method using a PDCCH blind detection system based on 5G communication according to an embodiment of the present invention for achieving this technical problem is, in a detection method using a PDCCH blind detection system based on 5G communication, a transmitting end is a physical downlink control channel (PDCCH). ) Generating 24-bit CRC parity according to data and a Cyclic Redundancy Check (CRC) key value, and inserting and combining the generated bits into the PDCCH data; Calculating, by the transmitter, a 24-bit CRC parity coupled to the PDCCH data and an RNTI (Radio Network Temprary Identifier) value of a user terminal as an exclusive OR (XOR); Transmitting, by the transmitter, header information of the PDCCH data including the 24-bit CRC parity and the 16-bit RNTI value; Detecting a part (8 bits) of CRC parity inserted in the header information by receiving and decoding the header information by a receiver; Comparing the 8-bit CRC parity with a predefined value by the receiving end, and obtaining Downlink Control Information (DCI) data according to the comparison result; And extracting a final RNTI value by using the obtained DCI data by the receiving end and completing PDCCH blind detection.

In addition, the step of detecting a part (8 bits) of the CRC parity inserted in the header information includes decoding the header information using a polar code, and a part (8 bits) of the CRC parity inserted in the header information. Can be detected.

In addition, the step of obtaining DCI data according to the comparison result is determined whether the detected 8-bit CRC parity matches the predefined value, and when all the 8 bits match, the decoded header information is normal data. It is determined that the DCI can be obtained.

In addition, the step of completing the detection of the PDCCH blind includes detecting a 16-bit CRC parity including the RNTI value using the obtained DCI data, the detected 16-bit CRC parity, and the generated at the transmitting end of the header. The final RNTI value may be extracted by calculating the 16-bit CRC parity coupled to the stage using an exclusive OR (XOR).

In addition, the PDCCH blind detection system based on 5G communication according to an embodiment of the present invention generates a 24-bit CRC parity according to a PDCCH (Physical Downlink Control Channel) data and a CRC (Cyclic Redundancy Check) key value to generate each bit. The PDCCH data inserted and combined into the PDCCH data and calculated by calculating a 24-bit CRC parity coupled to the PDCCH data and a 16-bit Radio Network Temprary Identifier (RNTI) value of the user terminal as an exclusive OR (XOR) A transmitter for transmitting header information; And receiving and decoding the header information, detecting a part (8 bits) of the CRC parity inserted in the header information, comparing it with a predefined value, and obtaining Downlink Control Information (DCI) data according to the comparison result to obtain a final RNTI. It includes a receiving end that extracts the value and completes the PDCCH blind detection.

As described above, according to the present invention, when the RNTI value of the user terminal and the number of user terminals are not determined in a 5G communication environment, it is possible to secure the accuracy of PDCCH blind detection by determining whether the RNTI value is reliable.

In addition, according to the present invention, the header information received by the PDCCH is decoded using a polar code, and a Cyclic Redundancy Check (CRC) parity bit (24 bits) is generated, and some of these are pre-defined 5G communication. It is possible to calculate an accurate RNTI value by securing the reliability of DCI by comparing it with the specifications of.

In addition, according to the present invention, it is possible to easily grasp the current status of user terminals allocated to each base station, and to be used for base station expansion and repeater installation.

In addition, according to the present invention, it is possible to significantly reduce the time and amount of calculation for calculating the RNTI value of the user terminal, thereby contributing to the development of 5G communication technology.

1 is a block diagram showing a PDCCH blind detection system based on 5G communication according to an embodiment of the present invention.
2 is an example of header information transmitted by a transmitter in a PDCCH blind detection system based on 5G communication according to an embodiment of the present invention.
3 is a diagram illustrating a predefined 5G communication specification as a table.
4 is a flow chart illustrating an operation flow of a PDCCH blind detection method based on 5G communication according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, definitions for these terms should be made based on the contents throughout the present specification.

First, a PDCCH blind detection system based on 5G communication according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a block diagram showing a PDCCH blind detection system based on 5G communication according to an embodiment of the present invention.

As shown in FIG. 1, the PDCCH blind detection system based on 5G communication according to an embodiment of the present invention includes a transmitting end 100 and a receiving end 200.

First, the transmitter 100 generates 24-bit CRC parity according to the PDCCH (Physical Downlink Control Channel) data and CRC (Cyclic Redundancy Check) key values, and inserts and combines the generated bits into the PDCCH data, and Header information of the calculated PDCCH data is transmitted by calculating the combined 24-bit CRC parity and the 16-bit Radio Network Temprary Identifier (RNTI) value of the user equipment (user equipment, not shown) as an exclusive OR (XOR).

Here, CRC (Cyclic Redundancy Check) is an error detection method to verify the reliability of data in serial transmission. Before data is transmitted, the CRC value is calculated according to the given data key value, attached to the data, and transmitted. In the (200) side, the CRC value is calculated again to obtain data.

In addition, the header information includes CRC parity and a 16-bit RNTI value of the user terminal by an exclusive OR (XOR), and is transmitted to the receiving terminal 200.

In addition, the receiving end 200 receives and decodes the header information transmitted from the transmitting end 100, and a part (8 bits) of the CRC parity inserted in the header information and a predefined value (here, the predefined value is the 5G communication specification). ), and DCI (Downlink Control Information) data is obtained according to the comparison result to extract a final RNTI value, and PDCCH blind detection is completed.

Hereinafter, detailed configurations of the transmitting end 100 and the receiving end 200 will be described.

FIG. 2 is an example of header information transmitted by a transmitter in a PDCCH blind detection system based on 5G communication according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a predefined 5G communication specification as a table.

First, the transmission terminal 100 includes a CRC parity generation module 110, a first calculation module 120 and a transmission module 130.

At this time, the CRC parity generation module 110 sequentially lists the generated 24-bit CRC parity by generating 24-bit CRC parity according to the PDCCH data and the key value of the CRC, and places 8 bits in a predetermined position in the header. It inserts bit by bit, and combines the remaining 16 bits by placing them at the end of the header.

In addition, the first operation module 120 calculates the 16-bit CRC parity coupled to the header and the RNTI value of the user terminal as an exclusive OR (XOR).

In addition, the transmission module 130 transmits header information including 24-bit CRC parity and RNTI value.

Further, the receiving end 200 includes a CRC parity detection module 210, a DCI acquisition module 220, and a second calculation module 230.

At this time, the CRC parity detection module 210 receives the header information transmitted from the transmission module 130 and decodes using a polar code to detect the 8-bit CRC parity inserted into the decoded header information.

Here, the polar code is a key technology that significantly improves 5G communication performance and guarantees quality of service.

That is, in an embodiment of the present invention, after detecting the reception power of the signal received through the PDCCH according to the characteristics of the polar code, a signal of a continuous resource element (RE) is selected, and channel equalization and decoding are performed on the selected data. , Detection, and de-scrambling are performed. In addition, data is acquired for each aggregation level, and rate dematching and decoding are performed for all DCI formats.

In addition, the DCI acquisition module 220 compares the 8-bit CRC parity detected from the CRC parity detection module 210 with a predefined 5G communication specification, and acquires DCI data according to the comparison result.

In detail, it is determined whether the insertion position of each 8-bit CRC parity detected from the CRC parity detection module 210 matches the index value of the predefined 5G communication specification as shown in FIG. In this case, it is determined that the decoded header information is normal data, and DCI is obtained.

The index indicated in red in FIG. 3 is the index value of the 8-bit CRC parity detected when decoding using the polar code, and the index indicated in blue is the index value of the 16-bit CRC parity to be calculated using the final decoded value. Means.

That is, when the DCI acquisition module 220 matches a part (8 bits) of the CRC parity bit detected during the decoding of the polar code, the index value (from 140 to 147) indicated in red color among the predefined 5G communication specifications. DCI data is assumed to be correct.

Then, the second operation module 230 extracts a final RNTI value by using the DCI data obtained from the DCI acquisition module 220 and completes the PDCCH blind detection.

In detail, the 16-bit CRC parity including the RNTI value is detected using the DCI data obtained from the DCI acquisition module 220, and the detected 16-bit CRC parity and the CRC parity generation module 110 are generated at the top of the header. The final RNTI value is extracted by calculating the 16-bit CRC parity combined at the end with an exclusive OR (XOR).

That is, accurate RNTI values can be extracted by obtaining accurate DCI data using the characteristics of the polar code and the number of CRC parity bits applied, and performing an exclusive OR operation on the finally decoded 16-bit CRC parity.

Hereinafter, a PDCCH blind detection method based on 5G communication according to an embodiment of the present invention will be described with reference to FIG. 4.

4 is a flow chart illustrating an operation flow of a method for detecting a PDCCH blind based on 5G communication according to an embodiment of the present invention, and a detailed operation of the present invention will be described with reference to this.

According to an embodiment of the present invention, first, the CRC parity generation module 110 of the transmitter 100 generates 24-bit CRC parity according to the PDCCH data and the CRC key value (S410).

Then, the CRC parity generation module 110 inserts and combines each bit generated in step S410 into the header of the PDCCH data (S420).

In detail, the 24-bit CRC parity generated in step S410 is sequentially arranged, 8 bits are inserted from the front to the position of the predefined header as shown in FIG. 2, and the remaining 16 bits are inserted at the end of the header. Place it on the stage and combine it.

Then, the first operation module 120 calculates the 16-bit CRC parity coupled to the header and the RNTI value of the user terminal as an exclusive OR (XOR) in step S420 (S430).

Then, the transmission module 130 transmits header information including the 8-bit CRC parity inserted in the header in step S420 and the 16-bit CRC parity calculated by XOR in step S430 and the RNTI value (S440).

Then, the receiving end 200 receives the header information transmitted in step S440 (S450).

Then, the CRC parity detection module 210 decodes the header information received in step S450 to detect the 8-bit CRC parity inserted into the decoded header information (S460).

Specifically, the header information received in step S450 is decoded using a polar code to detect the preceding 8-bit CRC parity inserted into the header information among the decoded 24-bit CRC parity.

Then, the DCI acquisition module 220 compares the 8-bit CRC parity detected in step S460 with a predefined 5G communication specification to determine whether they match (S470).

At this time, if the DCI acquisition module 220 determines that the 8-bit CRC parity detected in step S460 does not match the corresponding index value of the predefined 5G communication specification as a result of the determination in step S470, the decoded header information is determined to be abnormal data. It is determined (S470).

However, if the 8-bit CRC parity detected in step S460 matches a predefined value, it is determined that the decoded header information is normal data, and DCI data is obtained (S480).

Specifically, it is determined whether the insertion position of each of the 8-bit CRC parity detected in step S460 matches the index value of the predefined 5G communication specification as shown in FIG. 3, and if all 8 bits match, the decoded header DCI is obtained by determining that the information is normal data.

Then, the second operation module 230 detects the 16-bit CRC parity including the RNTI value by using the DCI data obtained in step S480 (S490).

Then, the second operation module 230 calculates the 16-bit CRC parity detected in step S490 and the 16-bit CRC parity coupled to the end of the header in step S420 as an exclusive OR (XOR) (S500).

Then, the second operation module 230 extracts the final RNTI value from the operation result in step S500 to complete DCCH blind detection (S510, S520).

As described above, the PDCCH blind detection system and method thereof based on 5G communication according to an embodiment of the present invention determine whether the reliability of the RNTI value is determined when the RNTI value of the user terminal and the number of user terminals are not determined in a 5G communication environment. The accuracy of PDCCH blind detection can be ensured.

In addition, according to an embodiment of the present invention, some of the header information received by the PDCCH is decoded using a polar code, and a cyclic redundancy check (CRC) parity bit (24 bits) is generated to pre-define some of them. It is possible to calculate an accurate RNTI value by securing the reliability of DCI by comparing it with the specifications of the 5G communication.

In addition, according to an embodiment of the present invention, it is possible to easily grasp the current status of user terminals allocated to each base station, and to be utilized for base station expansion and repeater installation.

In addition, according to the present invention, it is possible to significantly reduce the time and amount of calculation for calculating the RNTI value of the user terminal, thereby contributing to the development of 5G communication technology.

The present invention has been described with reference to the embodiments shown in the drawings, but these are only exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the following claims.

100: transmitter 110: CRC parity generation module
120: first calculation module 130: transmission module
200: receiver 210: CRC parity detection module
220: DCI acquisition module 230: second calculation module

Claims (8)

In the detection method using a PDCCH blind detection system based on 5G communication including a transmitter and a receiver,
The receiving end receives header information of PDCCH (Physical Downlink Control Channel) data including 24-bit Cyclic Redundancy Check (CRC) parity and 16-bit Radio Network Temprary Identifier (RNTI) value from the transmitting end, and a polar code Generating a part (8 bits) of the CRC parity inserted in the header information by decoding using );
Comparing the 8-bit CRC parity with a predefined value at the receiving end, and obtaining Downlink Control Information (DCI) data according to the comparison result; And
Including the step of extracting a final RNTI value by the receiving end using the obtained DCI data and completing the PDCCH blind detection,
Acquiring DCI data according to the comparison result,
A PDCCH blind detection method for obtaining the DCI by determining whether the generated 8-bit CRC parity matches the predefined value, and when all of the 8 bits match, determining that the decoded header information is normal data. delete delete The method of claim 1,
Completing the detection of the PDCCH blind,
The 16-bit CRC parity including the RNTI value is detected using the obtained DCI data, and the detected 16-bit CRC parity and the 16-bit CRC parity generated at the transmitting end and combined at the end of the header are exclusively ORed. A PDCCH blind detection method for extracting the final RNTI value by calculating with (XOR). In the 5G communication-based PDCCH blind detection system including a transmitting end and a receiving end,
The receiving end,
Receives header information of PDCCH (Physical Downlink Control Channel) data including 24-bit CRC (Cyclic Redundancy Check) parity and 16-bit Radio Network Temprary Identifier (RNTI) value from the transmitter, and uses a polar code A CRC parity detection module that decodes and generates an 8-bit CRC parity inserted into the header information;
A DCI acquisition module for comparing the detected 8-bit CRC parity with a predefined value, and obtaining Downlink Control Information (DCI) data according to a comparison result; And
A second operation module for extracting a final RNTI value using the obtained DCI data and completing PDCCH blind detection,
The DCI acquisition module,
5G communication that determines whether the insertion position of each of the generated 8-bit CRC parities matches the predefined value, and when all of the 8-bits match, determines that the decoded header information is normal data to obtain the DCI PDCCH blind detection system based. The method of claim 5,
The transmitting end,
The generated 24-bit CRC parity is sequentially arranged by generating 24-bit CRC parity according to the key value of the PDCCH data, and 8 bits are inserted into the header at a predefined position by 1 bit, and the remaining 16 bits A CRC parity generation module that arranges and combines the at the end of the header;
A first operation module that calculates a 16-bit CRC parity coupled to the header and an RNTI value of the 16-bit with an exclusive OR (XOR); And
5G communication-based PDCCH blind detection system comprising a transmission module for transmitting header information including the 24-bit CRC parity and the 16-bit RNTI value. delete The method of claim 5,
The second calculation module,
A 16-bit CRC parity including the RNTI value is detected using the obtained DCI data, and the detected 16-bit CRC parity and a 16-bit CRC parity generated by the CRC parity generation module and combined to the far end of the header 5G communication-based PDCCH blind detection system for extracting the final RNTI value by calculating XOR as an exclusive OR (XOR).

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