WO2019233371A1

WO2019233371A1 - Physical downlink control channel (pdcch) detection method and terminal

Info

Publication number: WO2019233371A1
Application number: PCT/CN2019/089796
Authority: WO
Inventors: 张荻; 郑方政; 王加庆; 缪德山
Original assignee: 电信科学技术研究院有限公司
Priority date: 2018-06-04
Filing date: 2019-06-03
Publication date: 2019-12-12
Also published as: CN110557223A

Abstract

The present disclosure provides a physical downlink control channel (PDCCH) detection method and a terminal, wherein the method comprises: acquiring a correspondence between an aggregation level and a channel state; and executing blind detection of a PDCCH according to the correspondence.

Description

Method and terminal for detecting physical downlink control channel PDCCH

Cross-reference to related applications

This application claims the priority of Chinese Patent Application No. 201810565635.4 filed in China on June 4, 2018, the entire contents of which are hereby incorporated by reference.

Technical field

The present disclosure relates to the field of communication technologies, and in particular, to a method and a terminal for detecting a physical downlink control channel (PDCCH).

Background technique

In the NR (New Radio) system, the PDCCH (Physical Downlink Control Channel) is used to carry downlink control information, and the CCE (Control Channel Element) is used as the basic logical unit. Each CCE Corresponds to the determined number of bits. The data sent by the base station to the terminal uses different AL (Aggregation Level, aggregation level), the possible values are 1, 2, 4, 8, 16 and so on. The base station determines the AL based on factors such as the load of the UE (terminal) and the channel state. When the load is large or the channel conditions are bad, in order to ensure the transmission quality, a higher AL is usually used.

The information sent by the base station to different UEs is multiplexed in the PDCCH, and data of a specific AL is mapped to some specific positions in the PDCCH.

In order to distinguish different UEs, CRC (cyclic check code) bits of transmitted information are scrambled using RNTI (Radio Network Temporary Identifier, wireless network temporary identifier). RNTI is related to the function of sending information and UE ID.

After receiving the paging signal, the UE enters the Connected state and monitors the PDCCH, but does not know the clear aggregation level of the information to be received and its position in the PDCCH. It can only obtain the optional range of AL from the upper layer. Each AL corresponds to multiple possible positions;

Therefore, it is necessary to perform multiple blind checks on these positions, that is, to decode, descramble and CRC check every possible position and length. If the check passes, the blind check ends and the required PDCCH information is obtained. Pass and do the same for the next possible position until all positions are traversed. Eventually, you can receive your own information, and this process consumes more power.

Summary of the Invention

The embodiments of the present disclosure provide a method and a terminal for detecting a physical downlink control channel PDCCH, which can enable the terminal to reduce the number of blind detections and reduce the power consumption of the terminal.

To solve the above technical problems, the embodiments of the present disclosure provide the following technical solutions:

A method for detecting a physical downlink control channel (PDCCH) includes:

Obtain the correspondence between the aggregation level and the channel state;

According to the corresponding relationship, a blind detection of the physical downlink control channel PDCCH is performed.

Performing a blind detection of the PDCCH according to the corresponding relationship includes:

Determine the order of the aggregation levels for blind detection according to the correspondence between the aggregation levels and the channel state information;

A blind detection of the PDCCH is performed according to the order of the aggregation levels.

The order of the aggregation levels for blind detection is determined according to the correspondence between the aggregation levels and the channel state information, including:

Obtain candidate values of the aggregation level that need to be blindly checked and the current channel status;

In the correspondence relationship, if an aggregation level corresponding to the current channel state is found, the found aggregation level is used as a starting aggregation level for blind detection, and a candidate value of the aggregation level is determined in a preset order. Sequence of blind inspection of other aggregation levels;

In the correspondence relationship, if the aggregation level corresponding to the current channel state is not found, among the candidate values of the aggregation level, the aggregation level closest to the aggregation level corresponding to the current channel state is used as a blind detection. And a blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order.

Wherein, determining the blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order includes:

Among the candidate values of the aggregation level, sequentially determining other aggregation levels used for blind detection in order of the closeness of the current channel state to the channel state in the corresponding relationship; or

Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the descending order of the aggregation level; or

Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the aggregation level in descending order.

Wherein, in accordance with the order of the closeness of the current channel state and the channel state in the corresponding relationship, determining other aggregation levels for blind detection includes:

According to the formula:

Obtaining the closeness between the current channel state and the channel state in the corresponding relationship;

Among the candidate values of the aggregation level, the aggregation level used for the blind detection is determined in order from ΔSINR in ascending order;

Wherein, ΔSINR represents the closeness of the current channel state to the channel state in the corresponding relationship, SINR _estimate is the current channel state, SINR _i is the i-th channel state in the corresponding relationship, and SINR _i-1 is the The i-1th channel state in the correspondence.

An embodiment of the present disclosure further provides a terminal, including: a processor, a memory, and a program stored on the memory and executable on the processor; when the processor executes the program, the following steps are implemented: :

Obtain the correspondence between the aggregation level and the channel state;

The processor is specifically configured to:

When the processor determines the aggregation level of the blind detection, it is specifically used to:

Wherein, when the processor determines a blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order, the processor is specifically configured to:

Wherein, when the processor determines other aggregation levels used for blind detection in the order of the closeness of the current channel state and the channel state in the corresponding relationship, the processor is specifically configured to:

According to the formula:

An embodiment of the present disclosure further provides a device for detecting a physical downlink control channel PDCCH, including:

A transceiver module, configured to obtain a correspondence between an aggregation level and a channel state;

A processing module is configured to perform blind detection of a physical downlink control channel PDCCH according to the corresponding relationship.

An embodiment of the present disclosure further provides a terminal including a processor configured to perform the following functions: acquiring a correspondence between an aggregation level and a channel state; and performing a blind detection of a physical downlink control channel PDCCH according to the correspondence.

An embodiment of the present disclosure also provides a computer storage medium including instructions that, when the instructions are executed on a processor, cause the processor to execute the method as described above.

The beneficial effects of the embodiments of the present disclosure are:

In the above embodiments of the present disclosure, the correspondence between the aggregation level and the channel state is obtained; according to the correspondence, a blind detection of the physical downlink control channel PDCCH is performed; the number of blind PDCCH detections can be reduced, and the power consumption of the terminal can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a flowchart of a method for detecting a physical downlink control channel PDCCH according to an embodiment of the present disclosure;

FIG. 2 shows a structural block diagram of a terminal according to an embodiment of the present disclosure;

FIG. 3 shows a block diagram of a device for detecting a physical downlink control channel PDCCH according to an embodiment of the present disclosure.

Detailed ways

Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a thorough understanding of the present disclosure, and to fully convey the scope of the present disclosure to those skilled in the art.

As shown in FIG. 1, an embodiment of the present disclosure provides a method for detecting a physical downlink control channel PDCCH, including:

Step 11: Obtain the correspondence between the aggregation level and the channel state. When the terminal obtains the correspondence between the aggregation level (AL) and the channel state, it can obtain it through a system message, such as receiving a system message sent by the base station. The system message carries the correspondence between the aggregation level (AL) and the channel state. The channel state can be represented by SINR (Signal, Interference, and Noise Ratio) as an indicator, and of course, it can also be represented by other channel state information.

Step 12: Perform a blind detection of the physical downlink control channel PDCCH according to the corresponding relationship. In this way, the terminal does not need to perform blind detection for multiple possible positions corresponding to each AL, thereby reducing the number of PDCCH blind detections and reducing the power consumption of the terminal.

In a specific embodiment of the present disclosure, the above step 12 may specifically include:

Step 121: Determine the order of the blindly detected aggregation levels according to the correspondence between the aggregation levels and the channel state information. When determining the order of the aggregation levels for blind inspection, this can be achieved in the following ways:

Obtain the candidate of the aggregation level that needs to be blindly checked and the current channel state; specifically, the terminal can obtain the current channel state by measuring the reference signal; after the terminal enters the connected state, it receives the search space sent by the upper layer through signaling Configuration to obtain candidate values for the aggregation levels that need to be blindly checked.

Step 122: Perform a blind detection of the PDCCH according to the order of the aggregation levels.

For example: using SINR as the channel state indicator, the correspondence between the base station sending AL and SINR through system information is as follows:

ii	00	11	22	33	44
SINR范围SINR range	(0,1](0,1)	(1,2](1,2)	(2,3](2,3)	(3,4](3,4)	(4,+∞)(4, + ∞)
ALAL	11	22	44	88	1616

Assume that the UE obtains SINR _estimate = 2.8 by measuring the reference signal, and the candidate AL value indicated by the high-level signaling received by the terminal is 1, 2, 4, 8, and 16. According to the above-mentioned correspondence relationship between the AL and SINR, Table 1 And SINR _estimate , it can be determined that the corresponding initial blind test AL = 4, and the remaining ALs can be blindly checked for other ALs in a preset order. In this way, when blind inspection is performed, AL = 4 is used as the initial blind inspection, and the blind inspection is further performed in a preset order. The correct AL can be detected with a higher probability, and no blind inspection is required for each AL, thereby reducing blind The number of inspections reduces the power consumption of the terminal.

In the above embodiments of the present disclosure, the blind detection order for determining other aggregation levels among the candidate values of the aggregation level according to a preset order may specifically include at least one of the following three methods:

1) among the candidate values of the aggregation level, in order of the closeness of the current channel state and the channel state in the corresponding relationship, other aggregation levels used for blind detection are determined in order; specifically,

According to the formula:

For example, when the aggregation level used for blind detection is determined in order from ΔSINR from small to large, the corresponding AL is 8, 2, 16, 1, and 1, in other words, the order of blind AL is 4, 8, 2, 16, 1, .

2) Among the candidate values of the aggregation level, other aggregation levels for blind detection are determined in order from the descending order of the aggregation level;

For example, using SINR as the channel state indicator, the correspondence between AL and SINR sent by the base station is as follows:

Assume that the SINR _estimate = 0.5 obtained by the UE by measuring the reference signal, and the AL candidate values received from high-level signaling are 2, 4, 8, 16; at this time, the reference value in the SINR _estimate correspondence table can be obtained from the correspondence table. AL = 1, AL candidate value does not include 1. Therefore, AL = 2 with the closest SINR is selected as the AL for the initial blind detection. The subsequent order can be in the order of the candidate value of the aggregation level from small to large, and the blind detection is finally determined. The AL order is 2, 4, 8, 16.

3) Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the aggregation level in descending order;

Assuming that the SINR _estimate = 5 obtained by the UE by measuring the reference signal, and the AL candidate values received from high-level signaling are 1, 2, 4, and 8, at this time, the reference value in the SINR _estimate correspondence table can be obtained from the correspondence table. AL = 16, AL candidate value does not include 16. Therefore, AL with the closest SINR = 8 is selected as the AL for the initial blind detection. The subsequent order can be determined in the order of the candidate value of the aggregation level from large to small. The AL sequence is 8, 4, 2, 1.

The above embodiments of the present disclosure perform blind detection of the physical downlink control channel PDCCH according to the correspondence between the AL and the channel state; in this way, the terminal can detect the correct AL earlier, and can stop the remaining candidates when the correct AL is detected AL detection, so that the terminal does not need to perform blind detection for multiple possible positions corresponding to each AL, thereby reducing the number of blind PDCCH detections and reducing power consumption of the terminal.

As shown in FIG. 2, an embodiment of the present disclosure further provides a terminal 20 including:

The transceiver 21 is configured to obtain a correspondence between an aggregation level and a channel state;

The processor 22 is configured to perform a blind detection of the physical downlink control channel PDCCH according to the corresponding relationship.

The processor 22 is specifically configured to determine the order of the aggregation levels for blind detection according to the correspondence between the aggregation level and the channel state information; and perform the blind detection of the PDCCH according to the order of the aggregation levels.

Wherein, when the processor 22 determines the aggregation level of the blind detection, the processor 22 is specifically configured to obtain the candidate value of the aggregation level that needs to be blindly detected and the current channel state;

Wherein, when the processor 22 determines a blind detection order of other aggregation levels among the aggregation level candidate values according to a preset order, the processor 22 is specifically configured to: among the aggregation level candidate values, according to the current channel state and The order of the closeness of the channel states in the correspondence relationship, and sequentially determine other aggregation levels for blind detection; or

Wherein, when the processor 22 determines other aggregation levels used for blind detection in the order of the closeness of the current channel state and the channel state in the corresponding relationship, it is specifically used to:

According to the formula:

It should be noted that this embodiment is an embodiment of a terminal device corresponding to the above method. All implementations of the above method are applicable to this embodiment, and the same technical effects can also be achieved.

The terminal 20 may further include: a memory 23, which is communicatively connected with the processor 22 or the transceiver 21 through a bus interface or an interface. The functions of the transceiver 21 may also be implemented by the processor 22. The terminal of the present disclosure may also include other components that implement the above method, such as a user interface.

As shown in FIG. 3, an embodiment of the present disclosure further provides a physical downlink control channel PDCCH detection device 30, including:

The transceiver module 31 is configured to obtain a correspondence between an aggregation level and a channel state;

The processing module 32 is configured to perform a blind detection of the physical downlink control channel PDCCH according to the corresponding relationship.

It should be noted that this embodiment is a device corresponding to the foregoing method embodiment. All implementation manners of the foregoing method embodiment are applicable to this embodiment, and the same technical effects can also be achieved.

An embodiment of the present disclosure also provides a computer storage medium including instructions that, when the instructions are run on a computer, cause the computer to execute the method as described above.

Those of ordinary skill in the art may realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation should not be considered outside the scope of the present disclosure.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and are not repeated here.

In the embodiments provided by the present disclosure, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist separately physically, or two or more units may be integrated into one unit.

When the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present disclosure is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in various embodiments of the present disclosure. The foregoing storage medium includes various media that can store program codes, such as a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

In addition, it should be noted that, in the apparatus and method of the present disclosure, it is obvious that each component or each step can be disassembled and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present disclosure. In addition, the steps for performing the above-mentioned series of processes can be naturally performed in chronological order according to the order of description, but need not necessarily be performed in chronological order, and certain steps may be performed in parallel or independently of each other. For those of ordinary skill in the art, it is able to understand all or any steps or components of the methods and devices of the present disclosure. , Software, or a combination thereof, which can be achieved by a person of ordinary skill in the art using their basic programming skills after reading the description of the present disclosure.

Therefore, the purpose of the present disclosure can also be achieved by running a program or a group of programs on any computing device. The computing device may be a well-known general-purpose device. Therefore, the object of the present disclosure can also be achieved only by providing a program product including a program code that implements the method or device. That is, such a program product also constitutes the present disclosure, and a storage medium storing such a program product also constitutes the present disclosure. Obviously, the storage medium may be any known storage medium or any storage medium developed in the future. It should also be noted that, in the apparatus and method of the present disclosure, it is obvious that each component or each step can be disassembled and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present disclosure. In addition, the steps for performing the series of processes described above can be performed naturally in chronological order in accordance with the described order, but need not necessarily be performed in chronological order. Certain steps can be performed in parallel or independently of each other.

The above is an optional implementation of the present disclosure. It should be noted that for ordinary people in the technical field, several improvements and retouches can be made without departing from the principles described in the present disclosure. These improvements and retouches are also Within the scope of this disclosure.

Claims

A method for detecting a physical downlink control channel (PDCCH) includes:

Obtain the correspondence between the aggregation level and the channel state;

According to the corresponding relationship, a blind detection of the physical downlink control channel PDCCH is performed.
The method for detecting a physical downlink control channel (PDCCH) according to claim 1, wherein performing blind detection of the PDCCH according to the corresponding relationship comprises:

Determine the order of the aggregation levels for blind detection according to the correspondence between the aggregation levels and the channel state information;

A blind detection of the PDCCH is performed according to the order of the aggregation levels.
The method for detecting a physical downlink control channel (PDCCH) according to claim 2, wherein determining the order of the aggregation levels for blind detection according to the correspondence between the aggregation levels and the channel state information comprises:

Obtain candidate values of the aggregation level that need to be blindly checked and the current channel status;

In the correspondence relationship, if an aggregation level corresponding to the current channel state is found, the found aggregation level is used as a starting aggregation level for blind detection, and a candidate value of the aggregation level is determined in a preset order. Sequence of blind inspection of other aggregation levels;

In the correspondence relationship, if the aggregation level corresponding to the current channel state is not found, among the candidate values of the aggregation level, the aggregation level closest to the aggregation level corresponding to the current channel state is used as a blind detection. And a blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order.
The method for detecting a physical downlink control channel (PDCCH) according to claim 3, wherein determining a blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order comprises:

Among the candidate values of the aggregation level, sequentially determining other aggregation levels used for blind detection in order of the closeness of the current channel state to the channel state in the corresponding relationship; or

Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the descending order of the aggregation level; or

Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the aggregation level in descending order.
The method for detecting a physical downlink control channel (PDCCH) according to claim 4, wherein determining other aggregation levels used for blind detection in the order of the closeness of the current channel state to the channel state in the corresponding relationship includes:

According to the formula:
Obtaining the closeness between the current channel state and the channel state in the corresponding relationship;

Among the candidate values of the aggregation level, the aggregation level used for the blind detection is determined in order from ΔSINR in ascending order;

Wherein, ΔSINR represents the closeness of the current channel state to the channel state in the corresponding relationship, SINR estimate is the current channel state, SINR i is the i-th channel state in the corresponding relationship, and SINR i-1 is the The i-1th channel state in the correspondence.
A terminal includes: a processor, a memory, and a program stored on the memory and executable on the processor; when the processor executes the program, the following steps are implemented:

Obtain the correspondence between the aggregation level and the channel state;

According to the corresponding relationship, a blind detection of the physical downlink control channel PDCCH is performed.
The terminal according to claim 6, wherein the processor is specifically configured to:

Determine the order of the aggregation levels for blind detection according to the correspondence between the aggregation levels and the channel state information;

A blind detection of the PDCCH is performed according to the order of the aggregation levels.
The terminal according to claim 7, wherein when the processor determines the aggregation level of the blind detection, the processor is specifically configured to:

Obtain candidate values of the aggregation level that need to be blindly checked and the current channel status;

In the correspondence relationship, if an aggregation level corresponding to the current channel state is found, the found aggregation level is used as a starting aggregation level for blind detection, and a candidate value of the aggregation level is determined in a preset order. Sequence of blind inspection of other aggregation levels;

In the correspondence relationship, if the aggregation level corresponding to the current channel state is not found, among the candidate values of the aggregation level, the aggregation level closest to the aggregation level corresponding to the current channel state is used as a blind detection. And a blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order.
The terminal according to claim 8, wherein the processor determines a blind detection order of other aggregation levels among the candidate values of the aggregation level in a preset order, and is specifically configured to:

Among the candidate values of the aggregation level, sequentially determining other aggregation levels used for blind detection in order of the closeness of the current channel state to the channel state in the corresponding relationship; or

Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the descending order of the aggregation level; or

Among the candidate values of the aggregation level, other aggregation levels used for blind detection are determined in order from the aggregation level in descending order.
The terminal according to claim 9, wherein the processor is specifically configured to: when determining the other aggregation levels used for blind detection in the order of the closeness of the current channel state and the channel state in the correspondence relationship:

According to the formula:
Obtaining the closeness between the current channel state and the channel state in the corresponding relationship;

Among the candidate values of the aggregation level, the aggregation level used for the blind detection is determined in order from ΔSINR in ascending order;

Wherein, ΔSINR represents the closeness of the current channel state to the channel state in the corresponding relationship, SINR estimate is the current channel state, SINR i is the i-th channel state in the corresponding relationship, and SINR i-1 is the The i-1th channel state in the correspondence.
A device for detecting a physical downlink control channel (PDCCH) includes:

A transceiver module, configured to obtain a correspondence between an aggregation level and a channel state;

A processing module is configured to perform blind detection of a physical downlink control channel PDCCH according to the corresponding relationship.
A terminal includes a processor configured to perform the following functions: acquiring a correspondence between an aggregation level and a channel state; and performing a blind detection of a physical downlink control channel PDCCH according to the correspondence.
A computer storage medium includes instructions that, when run on a processor, cause the processor to execute the method according to any one of claims 1 to 5.