CN111726200A - Blind detection method, terminal and storage medium - Google Patents
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Abstract
The method comprises the steps of receiving a control resource set, carrying out null element detection on each control channel unit in the control resource set, obtaining a detection result, and carrying out blind detection on the control channel units of non-null elements of the detection result according to the detection result. By the method, the technical problems that blind detection of the terminal on the CORESET is low in efficiency and reception delay is influenced can be solved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a blind detection method, a terminal, and a storage medium.
Background
In a mobile communication system (e.g., a 5G communication system), uplink and Downlink transmitted data need to be scheduled by a base station, and then scheduled information (e.g., occupied time-frequency resources, modulation and coding scheme, power adjustment, etc.) is stored in a DCI (Downlink Control information) and is sent to a terminal (e.g., a mobile terminal or a fixed terminal that can receive data through a wireless signal) through a PDCCH (Physical Downlink Control Channel), so that the terminal can correctly receive Downlink data or send uplink data. Therefore, the PDCCH is a controller for uplink and downlink traffic scheduling, and the terminal can know the format and scheduling of a traffic channel by receiving DCI information, and then receive or transmit data.
In a 5G communication system, a time-frequency resource Set that can be used by a PDCCH is called a CORESET (Control resource Set), which is similar to a Control domain in an LTE system, but the CORESET is more flexible than the Control domain in the LTE, the CORESET occupies all the time-frequency resource size, the starting position, the period, and the like, and is flexibly applied to different scenarios, and the CORESET uses a CCE (Control Channel Element) as a basic resource unit.
In a downlink communication system, for a certain terminal, in a data packet receiving a downlink control channel, control information and service data of other terminals in a cell are included, and the certain terminal can acquire DCI belonging to the certain terminal only through blind detection. Under different aggregation levels, the position of a PDCCH candidate set in CORESET can be calculated, so the most basic algorithm in blind detection is exhaustive search of search spaces under each aggregation level, the algorithm is simplest, but the blind detection efficiency is extremely low, and the receiving delay is influenced.
Disclosure of Invention
The disclosure provides a blind detection method, a terminal and a storage medium, and the method can solve the technical problems that the blind detection efficiency of the terminal on CORESET is low and the receiving time delay is influenced.
The embodiment of the disclosure provides a blind detection method, which comprises the following steps:
receiving a control resource set;
performing null element detection on each control channel unit in the control resource set, and acquiring a detection result;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the detection result.
According to the embodiment, after the control resource set is received, the null elements in the control resource set are detected, and the control channel units of the non-null elements are blindly detected according to the detection result, so that the technical problems that the blind detection efficiency is low and the receiving delay is influenced because the detection time resources are wasted due to the blind detection of the control channel units of the null elements are solved.
In another embodiment, the performing null element detection on the control channel unit in the control resource set specifically includes:
performing null element detection on each control channel unit in the control resource set, marking a control channel unit with a null element value of 0, and marking a control channel unit with a non-null element value of 1;
the detection result specifically includes:
and forming a binary bit string by using the 0 value of the control channel unit mark for detecting the null element value and the 1 value of the control channel unit mark for detecting the non-null element value, and taking the binary bit string as a detection result.
In another embodiment, the performing null element detection on each control channel unit in the control resource set, marking a control channel unit with a null element value of 0, and marking a control channel unit with a non-null element value of 1 specifically includes:
detecting the receiving power of each control channel unit in the control resource set, if the receiving power of a certain control channel unit is consistent with the noise interference power, determining that the certain control channel unit is a null element value, and marking a 0 value for the certain control channel unit;
or, if the received power of a certain control channel unit is detected to be inconsistent with the noise interference power, determining that the certain control channel unit is a non-null element value, and marking a value 1 for the certain control channel unit.
In another embodiment, blind detection is performed on the control channel elements of non-null elements of the detection result according to the detection result, which specifically includes:
and carrying out blind detection on the control information unit corresponding to the binary bit string 1 value according to the detection result of the binary bit string.
In another embodiment, the method further comprises:
acquiring downlink channel quality indication information;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the downlink channel quality indication information and the detection result.
It can be seen from the foregoing embodiment that, based on the foregoing embodiment, blind detection can be performed on the control channel unit of the non-empty element of the detection result according to the detection result, and in this embodiment, channel quality indication information and the detection result can also be combined to perform blind detection on the control channel unit of the non-empty element, thereby further improving blind detection efficiency.
In another embodiment, the blind detection of the control channel unit of the non-null element of the detection result according to the downlink channel quality indication information and the detection result specifically includes:
determining an aggregation level sequence for detecting the control resource set according to the downlink channel quality;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the aggregation level sequence.
The embodiment of the disclosure also provides a terminal, which receives the control resource set;
the terminal carries out null element detection on each control channel unit in the control resource set and acquires a detection result;
and the terminal carries out blind detection on the control channel units of the non-empty elements of the detection result according to the detection result.
According to the embodiment, the terminal can detect the null elements in the control resource set and perform blind detection on the control channel units of the non-null elements according to the detection result, so that the technical problems that the blind detection efficiency is low and the receiving delay is influenced due to the fact that the detection time resource is wasted due to the blind detection on the control channel units of the null elements are solved.
In another embodiment, the terminal acquires downlink channel quality indication information;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the downlink channel quality indication information and the detection result.
The embodiment of the present disclosure further provides a terminal, where the terminal includes: a processor and a machine-readable storage medium;
the machine-readable storage medium stores machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: the method in the above embodiment is implemented.
Embodiments of the present disclosure also provide a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to: the method in the above embodiment is implemented.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is a schematic flow chart of blind detection provided in an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of blind detection according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present specification. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the specification, as detailed in the appended claims.
The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present specification. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Currently, the CORESET uses CCEs as basic resource units, one CCE corresponds to 6 REGs, and one REG is composed of 12 subcarriers that are continuous in time domain, one symbol, and frequency domain. The PDCCH may be formed by aggregating 1, 2, 4, 8, and 16 CCEs, where different CCE quantities represent different aggregation levels and also represent the size of occupied CORESET resources, generally, the aggregation levels used in the common search space are 4, 8, and 16, and the candidate sets corresponding to each aggregation level are shown in table 1; the aggregation levels available for the UE-specific search space are 1, 2, 4, 8, and 16, and the number of candidate sets corresponding to each aggregation level is configured by a higher layer.
| Polymerization grade L | Number of candidate sets |
| 4 | 4 |
| 8 | 2 |
| 16 | 1 |
TABLE 1
As shown in table 2, for a common search space with a total CCE of 32 and an aggregation level L of 4, where the shaded portion is the position of the entire search space, there are 4 different candidate sets, indexes of CCEs are 0 to 3, 8 to 11, 16 to 19, and 24 to 27, respectively, and at the base station transmitting end, any one of the candidate sets may be selected to store DCI information.
TABLE 2
In a downlink communication system, for a single terminal, in a data packet receiving a downlink control channel, control information and service data of other terminals in a cell are included, and the terminal can acquire DCI belonging to the terminal only through blind detection. Under different aggregation levels, the position of a PDCCH candidate set in CORESET can be calculated and is fixed, so the most basic algorithm in blind detection is exhaustive search of a search space under each aggregation level, the algorithm is simplest, but the blind detection efficiency is extremely low, and the receiving time delay is influenced.
In order to solve the technical problems that the blind detection efficiency is extremely low and the receiving time delay is influenced due to the exhaustive search, the invention provides a blind detection method, and the technical problems can be solved through the method.
As shown in fig. 1, the present disclosure provides a method of blind detection, the method comprising:
s1, receiving a control resource set;
s2, performing null element detection on each control channel unit in the control resource set, and acquiring a detection result;
and S3, carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the detection result.
The method can be applied to a terminal, which includes a mobile terminal, such as a mobile phone, an ipad, a mobile computer, and a wireless receiving box, or the terminal can also be a fixed terminal with a wireless communication function, such as a fixed receiver.
In step S1, the received control resource set may be sent by the base station through a PDCCH channel, and specifically, the base station sends the control resource set to the terminal through the PDCCH channel after performing processing such as CRC addition, Polar coding, rate matching, scrambling, QPSK modulation, and resource mapping on the DCI information.
As described above, when the base station loads the control information of the terminal into the control resource set, the control information does not occupy all CCE spaces in the control resource set, and for CCEs that are not used, the base station performs padding using NIL (null element) bits, and the transmission power of resource elements padded with NIL bits is 0.
In step S2, after receiving the control resource set, the terminal performs null element detection (NIL detection) on the control resource set and obtains a detection result.
In an embodiment of null element detection, the terminal performs null element detection on the control resource set, and marks a value of 0 for a control channel element in which a null element value is detected and a value of 1 for a control channel element in which a non-null element value is detected.
And constructing a binary bit string by using the 0 value of the control channel unit mark for detecting the null element value and the 1 value of the control channel unit mark for detecting the non-null element value, and taking the binary bit string as a detection result.
In this embodiment, there is also provided an NIL detection method, including:
detecting the receiving power of each control channel unit in the control resource set, if the receiving power of a certain control channel unit is consistent with the noise interference power, determining that the certain control channel unit is a null element value, and marking a 0 value for the certain control channel unit;
or, if the received power of a certain control channel unit is detected to be inconsistent with the noise interference power, determining that the certain control channel unit is a non-null element value, and marking a value 1 for the certain control channel unit.
In this embodiment, since the base station does not occupy all CCE spaces in the control resource set when loading the control information into the control resource set, for example, in table 2, when the aggregation level is 4, the candidate level is also 4, that is, the shaded portion in table 2 may be used to store the control information, but generally does not occupy all the shaded portion, as shown in table 3:
TABLE 3
As shown in table 3, after passing through NIL detection, the result of the second row in table 3 is obtained according to the determination of the transmission power, and it can be seen from the binary bit string that the CCE corresponding to 1 stores control information, which may be for the terminal itself or may be for other terminals, and the CCE corresponding to 0 has no control information.
After the above detection result is obtained, step S3 is executed.
In step S3, 1 value in the detection result and the CCE corresponding to the 1 value are obtained, and as can be seen from the above description, the 1 value in the detection result indicates that the NIL bit is not present, that is, the CCE corresponding to the 1 value stores the control information. As shown in Table 3, it is possible that the control information may be stored in all of the 0-3CCE, 8-11CCE, 16-19CCE, and 24-27CCE in Table 3, and then it can be known from the second row in Table 3 that the 0 th, 1 st, 3 rd, 8-11 th, 17-19 th, and 24-27CCE are non-NIL bits, and the control information is stored; and the 2 nd and 16 th bits are NIL bits, which have no control information. Therefore, the CCEs 0, 1, 3, 8-11, 17-19 and 24-27 only need to be subjected to blind detection.
It can be seen from the above embodiments that, after receiving a control resource set sent by a base station, a terminal performs NIL detection on the control resource set, thereby excluding NIL bit bits, and then performs blind detection, thereby avoiding the technical problems of low blind detection efficiency and influence on reception delay due to the fact that detection time resources are wasted by performing blind detection on control channel elements of NIL bit bits (CCE bits of null elements).
When the base station selects the aggregation level of the CCE, CQI (channel quality Indication) information fed back by the current terminal is considered. The larger the aggregation level value is, the more beneficial the terminal to analyze the control information is, but the more time-frequency resources are occupied, so the base station can select a reasonable aggregation level according to the CQI value to ensure the reliability of the PDCCH. Therefore, for the terminal, the terminal may select a blind detection order of the aggregation level according to the current CQI value before blind detection.
Based on the above, the present disclosure also provides another embodiment, as shown in fig. 2:
s6, acquiring downlink channel quality indication information;
and S7, carrying out blind detection on the control channel unit of the non-empty element of the detection result according to the downlink channel quality indication information and the detection result.
In step S6, the terminal measures a sinr value (signal-to-interference noise ratio) of downlink reception according to the downlink reference signal, estimates a downlink Channel Quality (CQI) using the sinr value and the UE reception capability (for the sake of convenience, the downlink channel quality determined for the terminal is hereinafter referred to as a first CQI), or the base station may select a corresponding aggregation level according to the first CQI to generate a control resource set.
In order to improve the accuracy of blind detection performed by the terminal, the aggregation level of the control resource set may be selected by the base station side according to the first CQI determined in the above step, so that the terminal may also determine the order of the corresponding blind detection aggregation levels to perform blind detection on the control resource set sent by the base station, so as to improve the accuracy of detecting the control information of the terminal through blind detection, where a relationship between the first downlink channel quality and the order of the blind detection aggregation levels is that a higher value of the first CQI indicates a better downlink channel quality, the base station may occupy less time-frequency resources when generating the control resource set, and the order of the blind detection aggregation levels determined by the terminal side is from small to large; otherwise, the lower the first CQI value is, the worse the quality of the downlink channel is, the more time-frequency resources will be occupied by the base station when generating the control resource set, and the order of the blind detection aggregation levels determined by the terminal side is from large to small. To further illustrate this embodiment, the following examples are exemplified:
if the terminal determines that the first CQI is greater than 12, it may be determined that the downlink communication quality is good, and then according to the foregoing rule, a blind detection aggregation level sequence may be determined from small to large, that is, 2- > 1- > 4- > 8- > 16;
if the terminal determines that the first CQI is greater than 6 but less than 12, it may determine that the downlink communication quality is normal, and according to the foregoing rule, may determine the blind detection aggregation level sequence in the order of medium size, i.e. 8- > 4- > 16- > 2- > 1.
If the terminal determines that the first CQI is less than 6, it may be considered that the downlink communication quality is poor, and according to the foregoing rule, the blind detection aggregation level sequence may be determined in a descending order, that is, 16- > 8- > 4- > 2- > 1.
In executing step S7, the detection is performed according to the above determined blind detection aggregation level sequence and the above obtained detection result, which is exemplarily described below with reference to table 3,
if the order of the blind detection aggregation levels determined by the terminal is 2- > 1- > 4- > 8- >16, for example, when the blind detection aggregation level 4 is executed, according to table 3, CCEs corresponding to 4 consecutive values are selected from the search space (corresponding to different aggregation levels, the space for blind detection of CCEs is performed, for example, when the aggregation level is 4, the shaded portion in table 3) for blind detection, that is, 8-11 and 24-27 CCEs in table 3 are blind detected, but since NIL detections of the 2 nd CCE and the 16 th CCE in the search space are both 0, the blind detection requirement when the aggregation level is 4 is not satisfied, so that the 0 th to 3 rd CCE and the 16 th to 19 th CCE in the search space do not need to be detected, and the blind detection efficiency is further improved. (the principle is similar when the polymerization grades are 1, 2, 8, 16, so detailed description is omitted).
That is to say, in the present disclosure, when blind detection is performed on a search space in a received control resource set according to different aggregation levels, it is necessary to determine the search space of the control resource set under the aggregation level when the aggregation levels are different, and then perform blind detection in a matching search space by combining with the detection result of the NIL bit of the control resource set in the present disclosure.
Based on the above disclosure, the embodiment of the present disclosure further provides a terminal, which may be a mobile terminal or a fixed terminal with a wireless receiving function.
The terminal receives a control resource set;
the terminal detects the null elements of each control channel unit in the control resource set and acquires the detection result;
and the terminal carries out blind detection on the control channel units of the non-empty elements of the detection result according to the detection result.
The terminal acquires downlink channel quality indication information;
and the terminal carries out blind detection on the control channel unit of the non-empty element of the detection result according to the downlink channel quality indication information and the detection result.
Based on the above disclosure, an embodiment of the present disclosure further provides a terminal, where the terminal includes: a processor and a machine-readable storage medium;
the machine-readable storage medium stores machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: the steps in the above embodiments are implemented.
Based on the above disclosure, the disclosed embodiments also provide a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to: the steps in the above embodiments are implemented.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Other embodiments of the present description will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This specification is intended to cover any variations, uses, or adaptations of the specification following, in general, the principles of the specification and including such departures from the present disclosure as come within known or customary practice within the art to which the specification pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the specification being indicated by the following claims.
It will be understood that the present description is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.
The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A method of blind detection, the method comprising:
receiving a control resource set;
performing null element detection on each control channel unit in the control resource set, and acquiring a detection result;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the detection result.
2. The method of claim 1, wherein the performing null element detection on the control channel elements in the control resource set specifically comprises:
performing null element detection on each control channel unit in the control resource set, marking a control channel unit with a null element value of 0, and marking a control channel unit with a non-null element value of 1;
the detection result specifically includes:
and forming a binary bit string by using the 0 value of the control channel unit mark for detecting the null element value and the 1 value of the control channel unit mark for detecting the non-null element value, and taking the binary bit string as a detection result.
3. The method according to claim 2, wherein the performing null element detection on each control channel element in the control resource set, and marking a control channel element with a value of 0 when a null element value is detected, and marking a control channel element with a value of 1 when a non-null element value is detected specifically includes:
detecting the receiving power of each control channel unit in the control resource set, if the receiving power of a certain control channel unit is consistent with the noise interference power, determining that the certain control channel unit is a null element value, and marking a 0 value for the certain control channel unit;
or, if the received power of a certain control channel unit is detected to be inconsistent with the noise interference power, determining that the certain control channel unit is a non-null element value, and marking a value 1 for the certain control channel unit.
4. The method according to claim 2, wherein the blind detection of the control channel elements of the non-null elements of the detection result according to the detection result specifically comprises:
and carrying out blind detection on the control information unit corresponding to the binary bit string 1 value according to the detection result of the binary bit string.
5. The method of claim 1, further comprising:
acquiring downlink channel quality indication information;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the downlink channel quality indication information and the detection result.
6. The method according to claim 5, wherein performing blind detection on the control channel element of the non-null element of the detection result according to the downlink channel quality indication information and the detection result specifically includes:
determining an aggregation level sequence for detecting the control resource set according to the downlink channel quality;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the aggregation level sequence.
7. A terminal, characterized in that,
the terminal receives a control resource set;
the terminal carries out null element detection on each control channel unit in the control resource set and acquires a detection result;
and the terminal carries out blind detection on the control channel units of the non-empty elements of the detection result according to the detection result.
8. The mobile terminal of claim 7,
the terminal acquires downlink channel quality indication information;
and carrying out blind detection on the control channel units of the non-empty elements of the detection result according to the downlink channel quality indication information and the detection result.
9. A terminal, characterized in that the terminal comprises: a processor and a machine-readable storage medium;
the machine-readable storage medium stores machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: carrying out the method of any one of claims 1 to 6.
10. A machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to: carrying out the method steps of any one of claims 1 to 6.
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| WO2022188782A1 (en) * | 2021-03-09 | 2022-09-15 | 展讯通信（上海）有限公司 | Pdcch detection method and apparatus, and user equipment |
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| CN104869578A (en) * | 2014-02-26 | 2015-08-26 | 中国电信股份有限公司 | Physical downlink control channel blind detection method, device and user equipment |
| WO2018184560A1 (en) * | 2017-04-06 | 2018-10-11 | 维沃移动通信有限公司 | Downlink control channel detection method, terminal, and base station |
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Application publication date: 20200929 |