WO2012151976A1

WO2012151976A1 - Method and device for judging error detection

Info

Publication number: WO2012151976A1
Application number: PCT/CN2011/083645
Authority: WO
Inventors: 韩亚洁; 李斌
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-06
Filing date: 2011-12-07
Publication date: 2012-11-15
Also published as: CN102186193A

Abstract

The invention provides a method and device for judging error detection. In the method, when the CRC is passed during the blind detection process of PDCCH (Physical Downlink Control Channel), the DCI coding information and the DCI format type information corresponding to the DCI coding information are cached; the DCI coding information is judged according to an error detection judging rule corresponding to the DCI format type information to determine whether the result of the PDCCH blind detection is correct or not. By adopting the technical solution provided by the present invention, the error detection possibility of DCI blind detection can be reduced effectively, and the performance of the downlink can be improved.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for erroneous detection. BACKGROUND For a wireless communication system, a physical downlink control channel (PDCCH) is transmitted in a plurality of downlink control information (DCI format) (DCI format) for carrying scheduling information and other The control information includes: information such as a transport format, a resource allocation, and an uplink scheduling grant.

The PDCCH blind detection may be detected by mistake. Theoretical analysis: The probability of false detection of DCI is related to the bit length of Cyclical Redundancy Check (CRC). The CRC of the PDCCH is

16 bits, so the probability of theoretical false detection is / 2 . However, in an actual wireless environment, the probability of false detection is significantly greater than this value due to the influence of the transmission channel. The increase in false detection events for PDCCH blind detection affects downlink performance. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for erroneous detection determination to at least solve the above problems, in view of the problem that the increase in erroneous detection events of the PDCCH blind detection in the related art affects the performance of the downlink. According to an aspect of the invention, a false detection decision method is provided. The erroneous detection decision method according to the present invention includes: when the CRC passes the PDCCH, the DCI decoding information and the DCI format type information corresponding to the DCI decoding information are buffered; and the DCI format type information corresponding to the erroneous detection judgment rule is applied to the DCI. Decoding the information to determine whether the result of the PDCCH blind detection is correct. Before the DCI decoding information and the DCI format type information corresponding to the DCI decoding information are cached, the method further includes: performing de-resource mapping processing, de-precoding processing, de-layer mapping processing, and demodulation processing on the PDCCH at the user equipment UE side. And descrambling processing; performing DCI blind detection on the descrambling information of the PDCCH. The above DCI blind detection includes: rate rate matching, channel decoding, CRC descrambling, and solution CRC. When the DCI format type information is indicated as DCI2A, determining the DCI decoding information by using the error detection determination rule corresponding to the DCI format type information includes at least one of the following: determining whether the bit information of the zero padding is correct; determining the precoding Whether the information is correct or not; determining whether the modulation coding mode MCS and the redundancy version RV are correct; determining whether the hybrid automatic retransmission request HARQ process number is correct. When the DCI format type information is indicated as DCI1A, determining the DCI decoding information by using the erroneous detection judgment rule corresponding to the DCI format type information includes at least one of the following: determining whether the bit information of the zero padding is correct; if DCI1A is used In the random access process, it is determined whether the L/D VRB allocation identifier of the centralized or distributed virtual resource block and the value of the resource block RB allocation information are correct. When the false detection decision is not established, the method further includes: outputting a result of the PDCCH blind detection. According to another aspect of the present invention, an erroneous detection decision device is provided. The erroneous detection decision device according to the present invention includes: a storage module, configured to buffer DCI decoding information and DCI format type information corresponding to DCI decoding information when the CRC passes during PDCCH blind detection; The error detection determination rule corresponding to the DCI format type information determines the DCI decoding information, and determines whether the result of the PDCCH blind detection is correct. The device further includes: a signal processing module, configured to perform, on the user equipment UE side, a de-resource mapping process, a de-precoding process, a de-layer mapping process, a demodulation process, and a descrambling process on the receiving end of the PDCCH; the blind detecting module is set to The DCI blind detection is performed on the descrambling information of the PDCCH, where the DCI blind detection includes: solution rate matching, channel decoding, CRC descrambling, and solution CRC. The erroneous detection decision module includes at least one of the following units: The first determining unit is configured to determine whether the bit information of the zero padding is correct when the DCI format type information is indicated as DCI2A; the second determining module is set to be in the DCI When the format type information is indicated as DCI2A, it is determined whether the precoding information is correct. The third determining unit is configured to determine whether the MCS and the RV are correct when the DCI format type information is indicated as DCI2A; the fourth determining unit is set to be in the DCI. When the format type information is indicated as DCI2A, it is determined whether the hybrid automatic repeat request HARQ process number is correct. The erroneous detection decision module includes at least one of the following units: The fifth determining unit is configured to determine whether the bit information of the padding is correct when the DCI format type information is indicated as DCI1A; the sixth determining unit is set to be in the DCI When the format type information is indicated as DCI1A, if DCI1A is used for the random access procedure, it is determined whether the value of the centralized or distributed VRB allocation identifier and the resource block RB allocation information are correct. According to the present invention, after the DCI blindly detects the CRC, the decoding information is erroneously detected and determined, and the problem that the increase of the PDCCH detection of the PDCCH blind detection affects the performance of the downlink is solved, and the DCI can be effectively reduced. The probability of false detection of blind detection improves the performance of the downlink. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flow chart of a method for determining a false detection according to an embodiment of the present invention; FIG. 2 is a flow chart of a method for determining a false detection according to a preferred embodiment of the present invention; FIG. 3 is a DCI2A according to an example 1 of the present invention. 4 is a schematic diagram of DCI1A erroneous detection determination according to Example 2 of the present invention; FIG. 5 is a structural block diagram of erroneous detection decision apparatus according to an embodiment of the present invention; FIG. 6 is a schematic diagram of a preferred embodiment according to the present invention. A block diagram of the structure of the detection decision device. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flow chart of a method for determining a false detection according to an embodiment of the present invention. As shown in FIG. 1, the erroneous detection decision method mainly includes the following processing: Step S102: Cache DCI decoding information and DCI format type information corresponding to DCI decoding information when CRC passes during PDCCH blind detection; Step S104: Adopt The error detection determination rule corresponding to the DCI format type information determines the DCI decoding information, and determines whether the result of the PDCCH blind detection is correct. Since the erroneous detection in the PDCCH blind detection will affect the performance of the downlink, the method shown in FIG. 1 can be used to detect the CRC by the DCI after the blind detection of the CRC, and the error detection of the DCI can be effectively reduced. Check the probability and improve the performance of the downlink. Preferably, before performing step S102, the following processing may also be included but not limited to:

(1) performing, on the UE side of the user equipment, a de-resource mapping process, a de-precoding process, a de-layer mapping process, a demodulation process, and a descrambling process on the receiving end of the PDCCH;

(2) Perform DCI blind detection on the descrambling information of the PDCCH. The above DCI blind detection includes but is not limited to: solution rate matching, channel decoding, CRC descrambling, and solution.

CRC. The above preferred embodiments are further described below in conjunction with FIG. 2. 2 is a flow chart of a method of erroneous detection decision in accordance with a preferred embodiment of the present invention. As shown in FIG. 2, the erroneous detection decision method mainly includes the following processing: Step S202: Perform basic signal processing on the PDCCH channel at the receiving end on the UE side; where, in the foregoing step S202, perform basic processing on the receiving end of the PDCCH channel on the UE side. And performing a de-resource mapping process, a de-pre-coding process, a de-layering mapping process, a demodulation process, and a descrambling process on the PDCCH channel receiving end; Step S204: performing DCI blind detection on the PDCCH channel descrambling information; wherein, in step S204, The above-mentioned DCI blind detection includes: a solution rate decoding process, a channel decoding process, a CRC descrambling process, and a CRC process. Step S206: Cache the DCI decoding bit stream and the corresponding DCI format type information that the CRC passes during the blind detection process. In the foregoing step S206, when the CRC passes during the PDCCH blind detection process, the DCI decoding bit stream and the corresponding DCD are buffered. The DCI format type information is to be determined by the erroneous detection of step S208. Step S208: Perform a false detection on the buffered decoding information according to the DCI type, and further determine the correctness of the blind detection result, that is, whether the detection result of the CRC pass is a false detection result. In the above step S208, in the specific implementation process, the error detection determination module may be used, and the decoding information is input into the error detection determination module, and the error detection determination module performs the error detection judgment on the decoding result according to the error detection determination rule, and further determines the blind detection. The correctness of the results. Step S210: After the false detection decision, if the false detection decision is established, the final DCI blind detection result is output. On the other hand, if the blind detection result is wrong, the process returns to step S202. In the above step S210, according to the decision result of step S208, if the false detection decision is established, the blind detection is a false detection. Conversely, blind detection is passed, and the final DCI blind detection result is output. Preferably, when the DCI format type information is indicated as DCI2A, the foregoing step S104 may include at least one of the following processes:

(1) judging whether the bit information of the zero padding is correct;

(2) Determine whether the precoding information is correct;

(3) It is judged whether the Modulation and Coding Scheme (MCS) and the Redundancy Version (RV) are correct;

(4) Determine whether the Hybrid Automatic Repeat Request (HARQ) process ID is correct. The above preferred embodiments are further described below in conjunction with Example 1. Example 1 For the misdetection judgment of DCI2A, the flowchart of this example can be specifically referred to FIG. 2. The specific decoding information misdetection judgment is shown in FIG. 3, and FIG. 3 shows the TDD frame structure. When the uplink and downlink ratio is 1, 15M system bandwidth, 4 antennas, two streams, when the DCI format type is DCI2A, the bit stream through which the CRC passes is blindly detected. The erroneous detection decision method includes the following steps: Step 1 (corresponding to step S202): Perform basic signal processing on the receiving end of the PDCCH channel on the UE side. In a preferred implementation, the control information of the LTE downlink physical layer is mapped in the pre-CFI OFDM symbols of each subframe, including control indication information (CFI), HARQ indication information (HI), and downlink control information (DCI). Therefore, the UE side needs to complete basic signal processing of the PDCCH channel before performing PDCCH detection, where the basic signal processing includes de-resource mapping processing, de-precoding processing, de-layer mapping processing, demodulation processing, and descrambling processing on the PDCCH channel receiving end. . Step 2 (corresponding to step S204): Perform DCI blind detection on the PDCCH channel descrambling information. In the preferred implementation process, the PDCCH information after descrambling is the result of the DCI combination of all the users in the cell. Since the UE does not know the DCI type to be detected, the CCE set level and the start location information used, the PDCCH blind detection is required. . The descrambled soft information is searched according to a certain rule, and each possible information is subjected to de-rate matching, channel decoding, CRC descrambling, and CRC decoding until the CRC is correct. Step 3 (corresponding to step S206): Cache blindly detects the decoded bit stream passed by the CRC (ie, the above-mentioned decoding information) and the corresponding DCI format type information; when the CRC is passed in the blind detection process in step 2, the detected DCI is translated. The code information is buffered, and the corresponding DCI type information is saved, and the next error detection judgment is to be performed. Step 4 (corresponding to step S208): Performs a false detection decision on the buffered decoded bit stream according to the DCI format type, and further determines the correctness of the blind detection result. A preferred embodiment for determining the DCI decoding information using the false detection determination rule is separately described below. In the first method, it is judged whether the bit information of the zero padding is correct according to the DCI format type.

It is pointed out in 3GPP.TS36.212 that there is an operation of adding zeros to the original bits of a part of the DCI type. For a DCI decoded bit that is blindly detected, the bit that is padded with zeros should also be zero. If the value is non-zero, the DCI is falsely detected. Specifically, in the FDD frame structure, under the 15M system bandwidth, there is a zero-add operation for DCI2A. As shown in Figure 2, when 15M is taken out, the last bit of the DCI2A decoding result is filled with zero bits, and the decoded result value is 1, and DCI2A is judged to be false detection. Manner 2: Determine whether the precoding information is correct according to the reserved value requirement of the precoding index.

DCI2A has a Precoding information field under four ports. Under some mapping indexes, the precoding information is a reserved value. If the value of the Precoding information field is a reserved value, it can be determined that the DCI2A at this time is a false detection. Specifically, as shown in FIG. 3, the precoding bit of the DCI2A decoding result is taken as "11", that is, the precoding index is 3. For the DCI2A in the 4-antenna configuration, the value of the precoding index is 3, and it can be judged that the DCI2A at this time is false detection. Mode 3, determine whether the MCS and RV are correct. When DCI2A supports a single stream, the corresponding stream has MCS=0 and RV=1, indicating that the code stream is not enabled. Therefore, it can be introduced: When the DCI2A is dual-streamed, the two code streams cannot have MCS=0 and RV=1 at the same time. When the decoding result takes the value, it indicates that DCI2A is a false detection. Specifically, as shown in FIG. 3, for the dual stream of DCI2A, the MCS is 'Ό0000' and the RV is also "01", that is, both streams have MCS=0 and RV=1, and it can be judged that the DCI2A at this time is an error. Method 4: According to the cycle number requirement of the process ID, determine whether the HARQ Process Number is correct. Among them, there is a HARQ Process Number field in DC2A. For the TDD frame structure, the bit width of the HARQ Process Number field is 4 bits. The maximum value is related to the ratio of the uplink and downlink. Therefore, in the TDD frame structure, the HARQ Process Number can be judged correctly by combining the uplink and downlink ratios. If the value does not match the uplink and downlink ratio, the DCI2A is falsely detected. As shown in Figure 3, for the uplink and downlink ratio of DCI2A is 1, the HARQ Process Number field in the DCI2A decoding information is "1000", which is 8, and the maximum value of the HARQ Process Number is only in this uplink and downlink ratio. It can be judged as 7. It can be judged that DCI2A at this time is false detection. Step 5 (corresponding to step S210): If the DCI2A is erroneously detected by step 4, it is determined that the detection result of the DCI blind detection CRC is a false detection result. step Analyzing 4, described by blind detection DCI2A CRC for error detection DCI Preferably, when the type information indicates the DCI format is DCI 1A, step S104 may include at least one of the following processes:

(1) Determine whether the bit information of the zero padding is correct; (2) If DCI1A is used for the random access process, determine the centralized or distributed virtual resource block

(Localized/Distributed Virtual Resource blocks, abbreviated as L/D VRB) The allocation identifier and the resource block (referred to as RB) allocation information are correct. The above preferred embodiments are further described below in connection with Example 2. Example 2 For the misdetection judgment of DCI1A, the flowchart of this embodiment is shown in FIG. 2, and the specific decoding information misdetection judgment is as shown in FIG. 3, and includes the following steps: Step 1 (corresponding to step S202): Perform basic signal processing on the receiving end of the PDCCH channel on the UE side. Similar to the first example, the basic signal processing of the PDCCH channel needs to be completed before the PDCCH blind detection is performed on the UE side, where the basic signal processing includes the de-resource mapping, de-precoding, de-layer mapping, demodulation, and the PDCCH channel receiving end. De-scrambling. Step 2 (corresponding to step S204): Perform DCI blind detection on the PDCCH channel descrambling information. Similar to the first example, the PDCCH blind detection is performed. The descrambled soft information is searched according to a certain rule, and each possible information is subjected to de-rate matching, channel decoding, CRC descrambling, and CRC decoding until the CRC is correct. Step 3 (corresponding to step S206): Cache blindly detects the decoded bit stream passed by the CRC and the corresponding DCI format type information; when the step 2 blindly detects the CRC, the buffered DCI decoding information is cached, and the corresponding DCI is saved. Type information, pending the next step of false detection. Step 4 (corresponding to step S208): Performing a false detection determination on the buffered decoded bit stream according to the DCI format type, and further determining the correctness of the blind detection result. A preferred embodiment for determining the DCI decoding information using the false detection determination rule is separately described below. In the first method, it is judged whether the bit information of the zero padding is correct according to the DCI format type. Specifically, in the FDD frame structure, under the 10M system bandwidth, there is an operation of adding zeros to the DCI 1A. As shown in FIG. 4, FIG. 4 shows an FDD frame structure. When 10M system bandwidth is used, DCI1A is used for random access, and the bit stream through which the CRC passes is blindly detected. The last bit of the DCI1A decoding result at 10M is taken out and the zero bit is added. The decoded result value is "1", and it can be judged that the DCI2A at this time is false detection. Manner 2: If DCI1A is used in the random access procedure, the corresponding Localized/Distributed VRB assignment flag and Resource block assignment information have special value requirements. Specifically, when DCI1 A is used for the random access procedure, the Localized I Distributed VRB assignment flag is set to 0, and the Resource block assignment field is all 1s. As shown in FIG. 4, at 10M, the bit stream of the Resource block assignment field corresponding to DCI1 A is taken out as "11111111101", which is not all ones, and it can be judged that DCI1A at this time is false detection. It should be noted that the present invention may also have other various embodiments. There are multiple types of DCI formats in the LTE downlink, and the DCI format types are different, and the misdetection determination rules may be different. The DCI may be completed by the error detection and decision module. Misjudged judgment. For example, DCI2 has a reserved value of the Precoding information field under 2 or 4 rounds; a special value requirement for the UL Index in DCI0. FIG. 5 is a block diagram showing the structure of an erroneous detection decision apparatus according to an embodiment of the present invention. As shown in FIG. 5, the erroneous detection determining apparatus mainly includes the following modules: The storage module 50 is configured to buffer downlink control information (DCI) when a cyclic redundancy check (CRC) passes during a physical downlink control channel (PDCCH) blind detection process. The decoding information and the DCI format type information corresponding to the DCI decoding information; the error detection decision module 52 is configured to determine the DCI decoding information by using the error detection determination rule corresponding to the DCI format type information, and determine whether the result of the PDCCH blind detection is correct. In the preferred implementation process, if the error detection decision module 52 determines that the decision is made, the blind detection is a false detection, and the detection result of the CRC is a false detection result; otherwise, the blind detection is passed, and the detection result of the CRC passing during the PDCCH blind detection is output. . Preferably, as shown in FIG. 6, the erroneous detection determining apparatus further includes: a signal processing module 54 configured to perform a de-resource mapping process, a de-pre-coding process, a de-layer mapping process, and a solution on the PDCCH at the receiving end of the user equipment UE side. And the descrambling process; the blind detection module 56 is configured to perform DCI blind detection on the descrambling information of the PDCCH, where the DCI blind detection includes: de-rate matching, channel decoding, CRC descrambling, and solution CRC. Preferably, as shown in FIG. 6, the erroneous detection decision module 52 includes at least one of the following units: The first determining unit 520 is configured to determine whether the bit information of the zero padding is added when the DCI format type information is indicated as DCI2A. The second determining module 522 is configured to determine whether the precoding information is correct when the DCI format type information is indicated as DCI2A. The third determining unit 524 is configured to determine whether the MCS and the RV are determined when the DCI format type information is indicated as DCI2A. The value is correct. The fourth determining unit 526 is configured to determine whether the HARQ process number is correct when the DCI format type information is indicated as DCI2A. Preferably, as shown in FIG. 6, the erroneous detection decision module 52 further includes at least one of the following units: The fifth determining unit 528 is configured to determine the bit information of the zero padding when the DCI format type information is indicated as DCI1A. is it right or not; The sixth determining unit 530 is configured to determine whether the value of the centralized or distributed VRB allocation identifier and the resource block RB allocation information is correct if the DCI1A is used for the random access procedure when the DCI format type information is indicated as DCI1A. It is to be noted that the preferred embodiments of the modules and the units in the above-mentioned erroneous detection and determination apparatus are specifically described in the description of FIG. 1 to FIG. 4 , and details are not described herein again. In summary, with the above-mentioned embodiments provided by the present invention, the decoding result of the DCI blind detection CRC is further determined according to the DCI format type, and the false detection probability of the DCI is reduced, and the error analysis of the subsequent PDSCH channel is reduced. , thereby increasing the traffic of the link. At the same time, the proposed error detection module is based on the definition of the DCI related domain in the protocol. The judgment method is simple and easy to find false detection. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A method for false detection decision, comprising:

When the cyclic redundancy check CRC passes during the PDCCH blind detection of the physical downlink control channel, the downlink control information DCI decoding information and the DCI format type information corresponding to the DCI decoding information are cached;

Determining, by using the error detection determination rule corresponding to the DCI format type information, the DCI decoding information, and determining whether the result of the PDCCH blind detection is correct.

The method according to claim 1, wherein before the DCI decoding information and the DCI format type information corresponding to the DCI decoding information are buffered, the method further includes:

Demultiplexing resource mapping processing, de-precoding processing, de-layer mapping processing, demodulation processing, and descrambling processing on the PDCCH by the user equipment UE side;

Performing DCI blind detection on the descrambling information of the PDCCH.

3. The method according to claim 2, wherein the DCI blind detection comprises: de-rate matching, channel decoding, CRC descrambling, and solution CRC.

The method according to claim 1, wherein, when the DCI format type information is indicated as DCI2A, determining, by using a false detection determination rule corresponding to the DCI format type information, the DCI decoding information includes at least the following One:

Determining whether the bit information of the zero padding is correct;

Determine whether the precoding information is correct;

Determine whether the modulation coding mode MCS and the redundancy version RV are correct;

Determine whether the hybrid automatic repeat request HARQ process number is correct.

The method according to claim 1, wherein, when the DCI format type information is indicated as DCI1A, determining, by using the erroneous detection determination rule corresponding to the DCI format type information, the DCI decoding information includes at least the following One:

Determining whether the bit information of the zero padding is correct;

If the DCI1A is used in a random access procedure, determine a centralized or distributed virtual resource block L/D

Whether the value of the VRB allocation identifier and the resource block RB allocation information is correct. The method according to any one of claims 1 to 5, wherein, when the false detection decision is not established, the method further comprises: outputting a result of the PDCCH blind detection. A false detection and judgment device includes:

And a storage module, configured to buffer the downlink control information DCI decoding information and the DCI format type information corresponding to the DCI decoding information when the CRC passes in the PDCCH blind detection process of the physical downlink control channel;

The erroneous detection decision module is configured to determine the DCI decoding information by using a false detection determination rule corresponding to the DCI format type information, and determine whether the result of the PDCCH blind detection is correct. The device according to claim 7, further comprising:

a signal processing module, configured to perform, on the user equipment UE side, a de-resource mapping process, a de-precoding process, a de-layer mapping process, a demodulation process, and a descrambling process on the receiving end of the PDCCH;

The blind detection module is configured to perform DCI blind detection on the descrambling information of the PDCCH, where the DCI blind detection includes: de-rate matching, channel decoding, CRC descrambling, and CRC decoding. The apparatus according to claim 7 or 8, wherein said error detection decision module comprises at least one of the following units:

a first determining unit, configured to determine, when the DCI format type information is indicated as DCI2A, whether the bit information of the zero padding is correct;

a second determining module, configured to determine whether the precoding information is correct when the DCI format type information indication is DCI2A;

The third determining unit is configured to determine whether the MCS and the RV are correct when the DCI format type information is indicated as DCI2A;

The fourth determining unit is configured to determine whether the hybrid automatic repeat request HARQ process number is correct when the DCI format type information indication is DCI2A. The apparatus according to claim 7 or 8, wherein said error detection decision module comprises at least one of the following units:

a fifth determining unit, configured to determine, when the DCI format type information is indicated as DCI1A, whether the bit information of the zero padding is correct; a sixth determining unit, configured to: when the DCI format type information is indicated as DCI1A, if the DCI1A is used in a random access procedure, determine whether the centralized or distributed VRB allocation identifier, and the value of the resource block RB allocation information are correct.