CN114208375A

CN114208375A - PDCCH detection method and device

Info

Publication number: CN114208375A
Application number: CN201980099208.4A
Authority: CN
Inventors: 杨洪建; 邵家枫; 官磊; 余政; 夏金环
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-16
Filing date: 2019-10-15
Publication date: 2022-03-18
Anticipated expiration: 2039-10-15
Also published as: WO2021031317A1; CN114208375B; WO2021031032A1

Abstract

The embodiment of the application relates to a Physical Downlink Control Channel (PDCCH) configuration method and a device, which are used for improving the success rate of PDCCH detection, and the PDCCH configuration method comprises the following steps: a first user terminal UE accesses a broadcast special carrier; the first UE detects at least one first PDCCH candidate in the PDCCH candidate set on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L Control Channel Elements (CCEs), the starting positions of the coded bit collection of the first (N/2) × L CCEs and the second (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.

Description

PDCCH detection method and device

Cross Reference to Related Applications

This application claims priority from PCT patent application with international patent office, application number PCT/CN2019/101208, entitled "a PDCCH configuring method and apparatus", filed on 16.08.2019, which is incorporated herein by reference in its entirety.

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for detecting a PDCCH.

Background

A Physical Downlink Control Channel (PDCCH) may be sent in a Downlink subframe, and is used for transmitting Downlink Control Information (DCI), a region used for PDCCH transmission is called a Control region, and the Control region occupies the first N Orthogonal Frequency Division Multiplexing (OFDM) symbols of one Downlink subframe. The transmission of the PDCCH Channel is organized in CCE format, and in general, the PDCCH may be transmitted on M logically continuous Control Channel Elements (CCEs), which are called Aggregation Levels (AL), and there is a correspondence between the Aggregation levels and the number M of CCEs.

And the terminal performs PDCCH blind detection and searches whether the PDCCH sent by the terminal exists. The method comprises the steps that a terminal detects a PCFICH to obtain Control Format Indicator (CFI) information, the number of symbols occupied by a PDCCH in a time domain is determined, the terminal determines a Control region for transmitting the PDCCH according to the determined number of symbols occupied by the PDCCH in the time domain, the number of M is determined in the Control region according to a search space and the aggregation level of the PDCCH, and therefore PDCCH blind detection is carried out in M CCEs.

The CCE aggregation level of an existing normal terminal is 8, and the terminal can only perform blind detection on PDCCHs with an aggregation level not exceeding 8, whereas if the aggregation level of PDCCHs transmitted by the base station exceeds 8, such as 16 or 24, for an existing terminal which supports only CCE aggregation level 8 at most, the terminal cannot detect the PDCCHs transmitted by the base station in a blind manner, and cannot detect information such as DCI.

Disclosure of Invention

The embodiment of the application provides a method and a device for detecting a PDCCH (physical Downlink control channel), so that when the aggregation level of the PDCCH sent by network equipment is greater than the aggregation level supported by first UE, the first UE can detect the PDCCH by combining CCEs (control channel elements), and the success rate of PDCCH detection is improved.

In a first aspect, a method for detecting a PDCCH is provided, which includes the following steps: the method comprises the steps that network equipment sends a signal for UE to access to a user equipment UE on a broadcast special carrier; a first user terminal UE accesses a broadcast special carrier; the first UE detects at least one first PDCCH candidate in the PDCCH candidate set on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L Control Channel Elements (CCEs), the starting positions of the coded bit collection of the first (N/2) × L CCEs and the second (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.

Optionally, for the first UE, the signal sent by the network device and used for the first UE to access may also be used to indicate a first capability of the first UE, and/or to indicate the first UE to detect at least one first PDCCH candidate.

The first UE refers to a UE of a higher release, i.e., a UE supporting protocols of 16 and more releases, and is also referred to as a new UE. For example, the aggregation capability of the first UE is 4 or 8, 16 or higher, etc.

For example, the first capability includes at least one of:

the first UE supports detection of a first PDCCH candidate consisting of 16 CCEs, that is, the aggregation capability of the first UE is 16;

the first UE supports a version 16 protocol;

the first UE supports release 16 broadcast or multicast features.

For example, how the network device sends the PDCCH candidates on the broadcast dedicated carrier may be regarded as one first PDCCH candidate consisting of two second PDCCH candidates, and when there are multiple first PDCCHs, the process of sending the PDCCH candidates by the network device is similar, which is not described herein again.

In one implementation, the network device sends two second PDCCH candidates to the UE on a broadcast dedicated carrier.

The UE includes a first UE and a second UE.

For a first UE, if the first UE determines to detect a first PDCCH candidate, the first UE receives two second PDCCH candidates, and then combines the two second PDCCH candidates into one first PDCCH candidate, and the first UE detects the one first PDCCH candidate.

For the first UE, if the first UE determines not to detect the first PDCCH candidate, the first UE receives two second PDCCH candidates and then detects the two second PDCCH candidates respectively.

For the second UE, after receiving the two second PDCCH candidates, the second UE detects the two second PDCCH candidates respectively.

In the N × L CCEs, the starting positions of the code bit collection of the first (N/2) × L CCEs and the last (N/2) × L CCEs are the same, for example, CCE indexes (such as CCE logical codes) may be sorted from small to large, the first CCE to the (N/2) × L CCEs are the first (N/2) × L CCEs, and the (N/2) × L +1 CCE to the last CCE are the last (N/2) × L CCEs. Or CCE indexes 0 to (N/2) × L-1 are the first (N/2) × L CCEs, and CCE indexes (N/2) × L to the last CCE are the last (N/2) × L CCEs.

The same starting position of the collection of the code bits of the first (N/2) × L CCEs and the second (N/2) × L CCEs constituting the first PDCCH candidate refers to the first bit in the sequence after the collection of the code bit corresponding to the first CCE in the first (N/2) × L CCEs, the bit in the sequence before the collection of the corresponding code bit or the bit index in the sequence before the collection of the corresponding code bit is the first bit in the sequence after the collection of the code bit corresponding to the first CCE in the second (N/2) × L CCEs, and at least one of the bit in the sequence before the collection of the corresponding code bit or the bit index in the sequence before the collection of the corresponding code bit is the same.

The first UE accesses to a broadcast dedicated carrier, detects at least one first PDCCH candidate in a PDCCH candidate set on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L CCEs, the starting positions of the code bit collection of the front (N/2) × L CCEs and the starting positions of the code bit collection of the rear (N/2) × L CCEs are the same in the N × L CCEs, and the first UE can detect the first PDCCH candidate composed of the N × L CCEs.

In one possible implementation, the first PDCCH candidate consists of N × L consecutive CCEs starting with a first starting CCE, which is CCE index 0.

In one possible implementation, the first (N/2) × L CCEs, and the second (N/2) × L CCEs constitute two second PDCCH candidates, respectively.

In one possible implementation, the first (N/2) × L CCEs constitute a second PDCCH candidate, and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or

The first (N/2) L CCEs constitute a third PDCCH candidate, and the last (N/2) L CCEs constitute a second PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently from the second PDCCH candidate.

In this implementation, the two second PDCCHs are independent of each other and the starting positions of the coded bit collections of CCEs are the same, so that the second UE can decode the two second PDCCHs independently.

The second UE refers to a UE of a lower release, i.e. a UE that does not support the protocol of the release 16 or more, i.e. the second UE only supports the protocol of the release 16 or less, and is also referred to as an old UE.

In one possible implementation, the first PDCCH candidate is in a common search space.

It can also be said that the first PDCCH candidate belongs to the common search space. That is, the first UE monitors the first PDCCH candidate in the common search space.

In one possible implementation, the detecting at least one first PDCCH candidate in the set of PDCCH candidates comprises:

if the first UE receives an indication sent by network equipment for detecting the first PDCCH candidate, the first UE detects at least one first PDCCH candidate in the PDCCH candidate set; or

And if the first UE supports the detection of the first PDCCH candidate, the first UE detects at least one first PDCCH candidate in the PDCCH candidate set.

The network device sends an indication of detecting the first PDCCH candidate to the first UE, and the first UE may receive the indication of detecting the first PDCCH candidate sent by the network device.

In one implementation, the indication to detect the first PDCCH candidate is indicated by an MBMS master information block carried by the PBCH.

For example, the MBMS master information block includes one of a Master Information Block (MIB), MIB-MBMS, SIB1, and SI.

In a second aspect, a method for detecting a PDCCH is provided, which includes the following steps: the method comprises the steps that network equipment sends a signal for UE to access to a user equipment UE on a broadcast special carrier; the network equipment sends at least one first PDCCH candidate in a PDCCH candidate set to the UE on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L Control Channel Elements (CCEs), the starting positions of the coded bit collection of the first (N/2) × L CCEs and the second (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0; the UE detects the at least one first PDCCH candidate.

In one possible implementation, a PDCCH candidate consists of N x L consecutive CCEs starting with a first starting CCE, which is CCE index 0.

The first (N/2) × L CCEs constitute a third PDCCH candidate, and the last (N/2) × L CCEs constitute a second PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate.

In one possible implementation, the network device sends an indication to the first UE to detect a first PDCCH candidate.

In one possible implementation, the indication to detect the first PDCCH candidate is at least one information in an MBMS master information block carried by a physical broadcast channel, PBCH.

Illustratively, the network device is indicated by at least one information in the MBMS master information block.

For another example, the network device indicates, in the MBMS master information block, the bit status value indication through at least one piece of information, and has a correspondence relationship with the aggregation level that the PDCCH uses, which is agreed in advance by the first UE.

In a third aspect, a configuration method for a control format indicator CFI is provided, which includes the following procedures: the method comprises the steps that a user terminal (UE) determines a CFI, wherein the CFI is used for indicating the number of symbols occupied by PDCCH transmission in one subframe, and the CFI is determined by at least one of the following modes:

the UE determines the CFI according to the received third information;

the UE determines the CFI according to a predefined definition;

the UE determines the CFI according to the first corresponding relation and the fourth information;

wherein the third information and/or the fourth information are information carried in a Physical Broadcast Channel (PBCH);

and the UE detects the downlink control information PDCCH according to the CFI.

By statically configuring the CFI in the method, the UE can determine the CFI without or without detecting the PCFICH, and the UE can determine the value of the CFI in a connected state or an idle state, so that the success rate of PDCCH blind detection is improved.

In one possible implementation, the third information and/or the fourth information is carried in an MBMS master information block.

In one possible implementation, the third information indicates the value of the CFI by 1 bit, including one of:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

In a possible implementation, the third information indicates the value of the CFI by 1 bit, the value 0 represents the value of the CFI indicated by no third information, and the value of the CFI indicated by the value 1 includes one of the following cases:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

In one possible implementation, the third information indicates the value of the CFI by 1 bit, the value 1 represents the value of the CFI indicated by no third information, and the value of the CFI indicated by the value 0 includes one of the following cases:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

In one possible implementation, the third information indicates the value of the CFI by 2 bits, including one of:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

In one possible implementation, the third information indicates the value of the CFI by 2 bits, the value 00 indicates the value of the CFI without using the third information, and one of the

values

01,10, and 11 indicates the value of the CFI, including one of the following cases:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

Wherein the values of CFI indicated by the

values

01,10 and 11 are different.

In one possible implementation, the third information indicates the value of the CFI by 2 bits, the value 11 represents the value of the CFI indicated without using the third information, and one of the values 00,01, and 10 indicates the value of the CFI, including one of the following cases:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

Wherein the values of CFI indicated by the values 00,01 and 10 are different.

In one possible implementation, the UE determines the CFI value according to a predefined definition, the CFI value comprising one of 1,2,3, and 4.

In one possible implementation, the UE determines the value of the CFI according to sixth information and predefined, the sixth information including 1 bit;

a value of 0 indicates a value of CFI that is not determined using a predefined definition, and a value of 1 indicates a value of the CFI, including one of:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4;

or a value of 1 represents a value indicating that the CFI is not determined using the predefined definition and a value of 0 represents a value of the CFI, including one of the following cases:

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

In one possible implementation, the UE determines the CFI according to the first corresponding relationship and fourth information, where the fourth information is used to indicate a system bandwidth or a number of resource blocks, RBs;

the first corresponding relation comprises the corresponding relation between the numerical value of the system bandwidth and the numerical value of the CFI, or the corresponding relation between the number of RBs and the numerical value of the CFI.

In one possible implementation, the UE determines the CFI according to fifth information, the first corresponding relationship and fourth information, where the fifth information includes 1 bit;

a value of 0 indicates a value of CFI determined without using the first correspondence and the fourth information, and a value of 1 indicates a value of CFI determined using the first correspondence and the fourth information;

or a value of 1 indicates a value of CFI determined without using the first correspondence and the fourth information, and a value of 0 indicates a value of CFI determined using the first correspondence and the fourth information.

In one possible implementation, the first corresponding relationship includes a corresponding relationship between a numerical value of a system bandwidth and a numerical value of a CFI, or a corresponding relationship between a number of RBs and a numerical value of a CFI, and includes:

when the number of the system bandwidth or the number of the RBs is less than a first number, the number of the CFIs is 3;

when the number of the system bandwidth or the number of the RBs is greater than or equal to a first value and less than a second value, the number of the CFIs is 2;

when the value of the system bandwidth or the number of RBs is greater than or equal to a second value, the value of the CFI is 1.

when the number of the system bandwidth or the number of the RBs is less than or equal to a first value, the number of the CFIs is 3;

when the number of the system bandwidth or the number of the RBs is greater than a first value and less than or equal to a second value, the number of the CFIs is 2;

when the number of the system bandwidth or the number of the RBs is greater than a second value, the number of the CFIs is 1.

when the number of the system bandwidth or the number of the RBs is less than a first number, the number of the CFIs is 4;

when the number of the system bandwidth or the number of the RBs is greater than or equal to a first value and less than a second value, the number of the CFIs is 3;

when the number of the system bandwidth or the number of the RBs is greater than or equal to a second value and less than a third value, the number of the CFIs is 2;

when the value of the system bandwidth or the number of RBs is greater than or equal to a third value, the value of the CFI is 1.

when the number of the system bandwidth or the number of the RBs is less than or equal to a first value, the number of the CFIs is 4;

when the number of the system bandwidth or the number of the RBs is greater than a first value and less than or equal to a second value, the number of the CFIs is 3;

when the number of the system bandwidth or the number of the RBs is greater than a second value and less than or equal to a third value, the number of the CFIs is 2;

when the value of the system bandwidth or the number of RBs is greater than a third value, the value of the CFI is 1.

when the number of the system bandwidth or the number of the RBs is less than a first number, the number of the CFIs is 2; when the value of the system bandwidth or the value of the RB is greater than or equal to a second value, the value of the CFI is 1; or

When the number of the system bandwidth or the number of the RBs is less than a first number, the number of the CFIs is 3; when the value of the system bandwidth or the value of the RB is greater than or equal to a second value, the value of the CFI is 1; or

When the number of the system bandwidth or the number of the RBs is less than a first number, the number of the CFIs is 3; when the value of the system bandwidth or the value of the RB is greater than or equal to a second value, the value of the CFI is 2.

Optionally, the first value is the same as the second value.

when the number of the system bandwidth or the number of RBs is less than or equal to a first value, the number of the CFIs is 2; when the value of the system bandwidth or the value of the RB is greater than a second value, the value of the CFI is 1; or

When the number of the system bandwidth or the number of the RBs is less than or equal to a first value, the number of the CFIs is 3; when the value of the system bandwidth or the value of the RB is greater than a second value, the value of the CFI is 1; or

When the number of the system bandwidth or the number of the RBs is less than or equal to a first value, the number of the CFIs is 3; when the value of the system bandwidth or the value of the RB is greater than a second value, the value of the CFI is 2.

Optionally, the first value is the same as the second value.

In a fourth aspect, a method for configuring a control format indicator CFI is provided, which includes the following steps: the network equipment sends a third message and/or a fourth message to the User Equipment (UE), wherein the third message and the fourth message are used for indicating a CFI (channel quality indicator), and the CFI is used for indicating the number of symbols occupied by PDCCH (physical downlink control channel) transmission in one subframe;

wherein the third information and/or the fourth information are information carried in a physical broadcast channel PBCH.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

values

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

Wherein the values of CFI indicated by the

values

01,10 and 11 are different.

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

Wherein the values of CFI indicated by the values 00,01 and 10 are different.

In one possible implementation, the fourth information is used to indicate a system bandwidth or a number of resource blocks, RBs.

In a fifth aspect, an apparatus for detecting a PDCCH is provided. The apparatus provided by the present application has the functionality of a UE or a network device implementing the above method aspects, comprising means (means) for performing the steps or functionalities described in the above method aspects. The steps or functions may be implemented by software, or by hardware (e.g., a circuit), or by a combination of hardware and software.

In one possible design, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to support the apparatus to perform the functions of the UE or the network device in the above method.

Optionally, the apparatus may also include one or more memories for coupling with the processor that hold the necessary program instructions and/or data for the apparatus. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited.

In another possible design, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver or the input/output circuit to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the UE or the network device in the first aspect, the second aspect, any possible implementation manner of the first aspect, or any possible implementation manner of the second aspect.

Optionally, the apparatus may further include one or more memories for coupling with the processor, which stores program instructions and/or data necessary for the network device or satellite. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited.

The apparatus may be located in or be a UE or a network device.

In another possible design, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver or the input/output circuit to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the UE or the network device in any of the first aspect, the second aspect, any of the possible implementations of the first aspect, or any of the possible implementations of the second aspect.

In a sixth aspect, a CFI configuration apparatus is provided. The apparatus provided by the present application has the functionality of a UE or a network device implementing the above method aspects, comprising means (means) for performing the steps or functionalities described in the above method aspects. The steps or functions may be implemented by software, or by hardware (e.g., a circuit), or by a combination of hardware and software.

In another possible design, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver or the input/output circuit to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the UE or the network device in any of the third aspect, the fourth aspect, any of the possible implementations of the third aspect, or any of the possible implementations of the fourth aspect.

The apparatus may be located in or be a UE or a network device.

In another possible design, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver or the input/output circuit to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the UE or the network device in any one of the third aspect, the fourth aspect, any one of the possible implementations of the third aspect, or any one of the possible implementations of the fourth aspect.

In a seventh aspect, a computer-readable storage medium is provided for storing a computer program comprising instructions for performing the method of the first aspect, the second aspect, the third aspect, the fourth aspect, or any possible implementation manner of the first aspect, the second aspect, the third aspect, or the fourth aspect.

In an eighth aspect, there is provided a computer program product comprising: computer program code for causing a computer to perform the method of the first, second, third, fourth aspect described above, or any of the possible implementations of the first, second, third, fourth aspect, when the computer program code runs on a computer.

Drawings

FIG. 1 is a schematic diagram of a unicast communication system and a broadcast communication system;

FIG. 2 is a diagram of a control region for PDCCH transmission;

fig. 3 is a schematic diagram of a PDCCH detection process applicable to the embodiment of the present application;

fig. 4 is a schematic diagram of a CCE combination applicable to an embodiment of the present application;

fig. 5 is a schematic diagram of another CCE combination applicable to an embodiment of the present application;

fig. 6 is a flowchart illustrating a combination of CFI configuration and PDCCH detection applied in the embodiment of the present application;

fig. 7 is a schematic diagram of a PDCCH detection process applicable to the embodiment of the present application;

fig. 8 is a schematic diagram of a PDCCH detection process applicable to the embodiment of the present application;

fig. 9 is a structural diagram of a PDCCH detection apparatus according to an embodiment of the present invention;

fig. 10 is a structural diagram of a PDCCH detection apparatus according to an embodiment of the present invention;

fig. 11 is a structural diagram of a CFI configuration apparatus according to an embodiment of the present disclosure;

fig. 12 is a structural diagram of a CFI configuration apparatus according to an embodiment of the present disclosure.

Detailed Description

The present invention will be described in further detail below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: fourth Generation (4G), the 4G system includes a Long Term Evolution (LTE) system, a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth Generation (5G) system, such as new radio access technology (NR), and a future communication system, such as a 6G system.

This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

Some terms of the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

1) A terminal, also referred to as user equipment/user terminal (UE), Mobile Station (MS), Mobile Terminal (MT), etc., refers to a device that provides voice and/or data connectivity to a user. Such as a handheld device, a vehicle-mounted device, etc., having a wireless connection function. Currently, some examples of terminals are: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm top computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (smart), a wireless terminal in city (smart city), a wireless terminal in home (smart home), a wireless terminal in terrestrial broadcast (terrestrial broadcast), and the like.

2) A network device is a device in a wireless network, for example, the network device may be a Radio Access Network (RAN) node (or device) for accessing a terminal to the wireless network, and may also be referred to as a base station. Currently, some examples of RAN nodes are: a Node B (gnb) that continues to evolve, a Transmission Reception Point (TRP), an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a Base Band Unit (BBU), or a wireless fidelity (Wifi) access point (access point, AP). In addition, in one network configuration, the network device may include a Centralized Unit (CU) node, or a Distributed Unit (DU) node, or a RAN device including a CU node and a DU node. The RAN device including the CU node and the DU node splits a protocol layer of an eNB in a Long Term Evolution (LTE) system, puts functions of part of the protocol layer in CU centralized control, distributes functions of the remaining part or all of the protocol layer in the DU, and centrally controls the DU by the CU. For another example, the network device may be a Core Network (CN) device for providing service support for the terminal, and a common core network device includes an access and mobility management function (AMF) entity, a Session Management Function (SMF) entity, a User Plane Function (UPF) entity, and the like, which are not listed here. The AMF entity can be responsible for access management and mobility management of a terminal; the SMF entity may be responsible for session management, such as session establishment for a user; the UPF entity may be a functional entity of the user plane and is mainly responsible for connecting to an external network. The base station can be a high-tower high-power base station with high sky position, large transmitting power and far coverage area, or a low-tower low-power base station with low sky position, small transmitting power and close coverage area.

3) The wireless communication system is mainly divided into Unicast (Unicast), Broadcast (Broadcast) and Multicast/Multicast (Multicast)3 data transmission modes.

4) A cell, also referred to as a cell, is an area covered by a base station or a part of a base station (generally referred to as the area covered by radio signals), and terminals located in the cell can communicate with the base station through radio channels.

5) The upper layer, also called the upper layer protocol layer, is at least one of each protocol layer above the physical layer. The higher layer protocol layer may specifically be at least one of the following protocol layers: a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Resource Control (RRC) layer, and a non-access stratum (NAS) layer. It will be appreciated that higher layer signaling may also be generally equivalent to configuration information.

6) A broadcast dedicated carrier including a carrier for carrying data information and/or control information in a multimedia broadcast multicast service dedicated (MBMS-dedicated) cell, or a carrier for carrying data information and/or control information in a multimedia broadcast multicast service/Unicast-mixed (MBMS/Unicast-mixed) cell, or a carrier for carrying data information and/or control information in a further enhanced multimedia broadcast multicast service/Unicast-mixed (femmbms/Unicast-mixed) cell.

7) The UE accesses the broadcast dedicated carrier, where the UE accessing the broadcast dedicated carrier at least includes the UE detecting a synchronization signal and information such as a Master Information Block (MIB) obtained by the UE. The UE detects a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) sent by network equipment, the UE and a cell corresponding to the network equipment acquire time and frequency Synchronization, and the UE determines a physical cell identifier and a cell identifier group number to which the physical cell identifier belongs. The cell is a cell to which data information and/or control information carried on a broadcast dedicated carrier belongs. And the UE decodes the physical broadcast channel PBCH to obtain information such as a master information block MIB and a system information block SIB1 of the cell. The MIB also comprises MIB-MBMS sent by a special cell of multimedia broadcast multicast service (MBMS-dedicated), and comprises information such as downlink system bandwidth, wireless system frame number SFN and the like; the system message block SIB1 also includes SIB1-MBMS sent by a multimedia broadcast multicast service (MBMS-dedicated) dedicated cell, containing scheduling information for System (SI) messages.

8) And a DCI processing process, wherein the PDCCH bears the DCI, and the DCI processing process mainly comprises CRC addition, channel coding, rate matching and the like.

CRC addition, DCI transmission can obtain error detection by adding a cyclic redundancy check, CRC, to the transport block. Transport block, i.e. the bit sequence of the payload is a₀,a ₁,a ₂,a ₃,...,a _A-1Parity bit sequence is p₀,p ₁,p ₂,p ₃,...,p _L-1Where A is the number of payload bits and L is the number of parity bits. The transport block bit sequence after CRC addition is b₀,b ₁,b ₂,b ₃,...,b _B-1Wherein B ═ a + L. After adding the CRC, the CRC bit sequence is scrambled by the corresponding RNTI sequence, forming a bit sequence c₀,c ₁,c ₂,c ₃,...,c _B-1。

Channel coding, the coded block bit sequence of the input channel coding is c₀,c ₁,c ₂,c ₃,...,c _K-1Where K is the number of bits that need to be encoded. The bits encoded by the tail-biting convolutional code are

Where i is the index of the encoder output coded stream, and i is 0,1, 2, D is the number of bits per coded stream, and D is K.

Rate matching, the rate matching of DCI comprising 3bit streams

And

interleaving, bit collection and circular buffer generation.

The bit sequence input to the block interleaver is represented as

The interleaved bits of the sub-blocks are represented as

D is the number of bits.

Length of K_w＝3K _ΠThe ring buffer of (2) is generated according to the following requirements:

k＝0,…,K _Π-1；

k＝0,…,K _Π-1；

k＝0,…,K _Π-1. Bit sequence of rate matching outputIs listed as e_kK is 0, 1., E-1, and the sequence length is E.

The method of bit collection is as follows: let k be 0 and j be 0; when k is<E, if

Then

And k is k + 1; j equals j + 1. The bit collection module multiplexes the sub-blocks which are interleaved together to obtain the sub-block with the length of K_w＝3K _ΠRepeatedly placing said sequence w into a bit sequence E of length denoted E_kUntil it is filled. Where E is the number of bits transmitted by the physical channel and is related to the aggregation level of the PDCCH candidates. For example, if the aggregation level of PDCCH candidates is 8 and Quadrature Phase Shift Keying (QPSK) modulation is used, E ═ 2 × 8 × 9 × 4 ═ 576 bits; if the aggregation level of PDCCH candidates is 16, QPSK modulation is used, then E2 x 16 x 9 x 4 x 1152 bits.

The starting position of the CCE coding bit collection is a sequence e carried on the CCE after bit collection_kThe first bit in the sequence w before bit collection or the bit index of the sequence w before the bit collection. For example, a PDCCH candidate with an aggregation level of 8 consists of 8 CCEs, wherein the first bit after collection of the coded bits of the first CCE is e₀The first bit e after the collection of the coded bits₀The bit before collection of the corresponding coded bit is w₀Then the starting position of the collection of the coded bits of the first CCE is w₀Or 0; if the first bit after the collection of the code bits of the second CCE is e₇₁The first bit e after the collection of the coded bits₇₁The bit before collection of the corresponding coded bit is w₇₁Then the starting position of the collection of the coded bits of the first CCE is w₇₁Or 71; the first CCEIs different from the start position of the code bit collection of the second CCE.

9) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. "plurality" means two or more, and other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Furthermore, for elements (elements) that appear in the singular form "a," an, "and" the, "they are not intended to mean" one or only one "unless the context clearly dictates otherwise, but rather" one or more than one. For example, "a device" means for one or more such devices. Still further, at least one (at least one of a). a, b, c, a-b, a-c, b-c or a-b-c, wherein a, b and c can be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first packet and the second packet are only for distinguishing different packets, and do not indicate differences in the contents, priorities, transmission orders, importance levels, and the like of the two packets.

In order to facilitate understanding of the embodiments of the present application, an application scenario used in the present application will be described first.

First, Multimedia Broadcast Multicast Service (MBMS) is introduced. Wireless communication systems are mainly divided into Unicast (Unicast), Broadcast (Broadcast) and Multicast/Multicast (Multicast)3 data transmission modes. In contrast to unicast point-to-point delivery, in a broadcast or multicast communication system, one data signal may be received by multiple terminals. As shown in fig. 1(1), a Base Station (BS) and UEs 1-2 form a unicast communication system, and the BS sends different data signals (such as signal 1 and signal 2 in fig. 1 (1)) to UEs 1-2, respectively; in fig. 1(2), the BS and UEs 1-2 form a broadcast communication system, and the BS simultaneously transmits the same data signal (e.g., signal 1 in fig. 1 (2)) to UEs 1-2.

The rapid development of internet technology and the rapid popularization of large-screen multimedia terminals have promoted a large number of large-bandwidth and high-rate multimedia services, such as television broadcasting, ball game rebroadcasting, internet live broadcasting, time-frequency conferences, and the like. Compared with the general mobile data service, the multimedia service allows a plurality of users to receive the same data at the same time, and has the characteristics of high transmission data and large coverage area. In order to effectively utilize wireless network resources, the MBMS is introduced by the third Generation Partnership Project (3 GPP), so as to implement point-to-multipoint data transmission and improve the utilization rate of air interface resources. A Physical Multicast Channel (PMCH) is defined in LTE for data transmission of MBMS services. The MBMS service uses a Multimedia Broadcast multicast Single Frequency Network (MBSFN) to jointly transmit MBMS signals on the same time, Frequency and space domain resources through a plurality of cells synchronized with each other, and then naturally forms a combination of multi-cell signals in the air, thereby improving a Signal to Interference plus Noise Ratio (SINR) at the UE side.

MBMS cells (cells) are classified into the following three types according to the data to be transmitted: a Multimedia Broadcast Multicast Service dedicated (MBMS-differentiated) cell, a Multimedia Broadcast Multicast Service/Unicast mixed (MBMS/Unicast-mixed) cell, and a Further enhanced Multimedia Broadcast Multicast Service (dormant enhanced Multimedia Broadcast Multicast Service, femms)/Unicast mixed cell, wherein the MBMS dedicated cell only transmits MBMS Service, the MBMS/Unicast mixed cell transmits both MBMS Service and Unicast Service, the femms/Unicast mixed cell is a special MBMS/Unicast-mixed cell and also transmits both MBMS Service and Unicast Service, and at least one of the following conditions is satisfied in the femms/Unicast mixed cell: a subframe (subframe)4 configures an MBSFN subframe, or a subframe 9 configures an MBSFN subframe, or both the subframe 4 and the subframe 9 are configured as MBSFN subframes, and a subframe not including a unicast control region exists in the femmbms/unicast mixed cell, and the MBSFN subframe is a subframe for transmitting MBMS service. For an MBMS-dedicated Cell, there is at least one non-MBSFN Subframe every 40ms for transmitting a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH), etc., and the Subframe is called a Cell Acquisition Subframe (CAS). The physical channel or signal in the CAS subframe cannot be multi-cell signal combined, resulting in the SINR of the physical channel received by the UE in the CAS subframe being lower than the SINR of the PMCH signal in the MBSFN subframe. When the channel condition is poor, the SINR of a physical channel (for example, PDCCH) in the CAS subframe received by the UE is lower than the demodulation threshold, and the PDCCH blind detection is unsuccessful, so that the UE cannot normally receive the System Information (SI) carried in the PDSCH, and also cannot receive the PMCH data signal.

In a Long Term Evolution (LTE) system, a Physical Downlink Control Channel (PDCCH) may be transmitted in a Downlink subframe for transmitting Downlink Control Information (DCI). The region for PDCCH transmission is a control region, and occupies the first N Orthogonal Frequency Division Multiplexing (OFDM) symbols of one downlink subframe, where N may take values of 1,2,3, and 4, and time domain interleaving is performed on different OFDM symbols. Fig. 2 is a schematic diagram of a control region, and the control region in fig. 2 occupies 3 consecutive OFDM symbols.

The transmission of the PDCCH Channel is organized in the form of Control Channel Elements (CCEs), and 1 CCE includes 9 Resource Element Groups (REGs). The control region of each subframe consists of a series of control channel elements CCE numbered from 0 to N_CCE,k-1, wherein N_CCE,kIs aThe total number of CCEs in the control region on frame k. The PDCCH may be transmitted on M CCEs that are logically consecutive, where M may take on values of 1,2,4, 8, which is called Aggregation Level (AL). The starting CCE index of a PDCCH candidate, also referred to as the first CCE index, refers to the lowest or smallest index of the CCEs that make up the PDCCH candidate. A series of PDCCH candidates in the search space constitutes a PDCCH candidate set.

And the UE carries out PDCCH blind detection in the control region and searches whether the PDCCH sent by the UE exists. The PDCCH blind detection process is that the UE uses a Radio Network Temporary Identifier (RNTI) corresponding to the UE to attempt decoding on PDCCH candidates with different CCE aggregation levels and DCI formats in a PDCCH search space in a control region of a downlink subframe, and if the decoding is correct, the UE receives DCI transmitted for the UE. The Search Space of the UE is divided into a Common Search Space (Common Search Space) and a user-specific Search Space (UE-specific Search Space). The public search space is mainly used for transmitting cell exclusive control information, such as paging information, system information, multicast control information and the like; the dedicated search space is mainly used for transmitting control information related to uplink and downlink data channel scheduling. The UE detects only the PDCCH in the common search space in the CAS subframe.

The Common Search space occupies 16 logically continuous CCEs starting from CCE index 0 and supports only two Aggregation levels of 4 and 8, as shown in table 1, where Search space represents a Search space of a cell, Type represents a Type of the Search space of the cell, UE-specific represents a user-specific Search space, Common represents a Common Search space, Aggregation level represents an Aggregation level, Size [ in CCEs ] represents a Size of the CCEs (i.e., the Number of CCEs), Number of PDCCH Candidates represents the Number of PDCCH Candidates, and specifically, in the user-specific Search space, the Aggregation level is 1, the Number of CCEs is 6, the Number of PDCCH Candidates is 6, the Aggregation level is 2, the Number of CCEs is 12, the Number of PDCCH Candidates is 6, the Aggregation level is 4, the Number of CCEs is 8, the Number of PDCCH Candidates is 2, the Aggregation level is 8, the Number of CCE Candidates is 16, and the Number of PDCCH Candidates is 2; in the common search space, the aggregation level is 4, the number of CCEs is 16, the number of PDCCH candidates is 4, the aggregation level is 8, the number of CCEs is 16, and the number of PDCCH candidates is 2.

TABLE 1

In the following, a Control Format Indicator (CFI) is described, and a Physical Control Format Indicator Channel (PCFICH) carries CFI information for indicating the size of a Control region in each subframe, that is, a PDCCH in each subframe occupies several symbols in a time domain. Table 2 lists the number of symbols that the PDCCH may occupy per subframe, where the subframe includes: 1,

subframes

1 and 6 of frame structure type 2, or a subframe of frame structure type 3 with the same DwPTS duration configured with a special subframe, wherein if the number of downlink Resource Blocks (RBs) is greater than 10, the number of symbols occupied by the PDCCH on the subframe is 1 or 2, and if the number of downlink RBs is less than or equal to 10, the number of symbols occupied by the PDCCH on the subframe is 2; 2, the sub-carrier interval is 15kHz and the MBSFN sub-frame is configured with 1 or 2 special antenna ports of the cell, if the number of RBs is more than 10, the number of symbols occupied by the PDCCH on the sub-frame is 1 or 2, and if the number of downlink RBs is less than or equal to 10, the number of symbols occupied by the PDCCH on the sub-frame is 2; 3. the interval of subcarriers is 15kHz and is configured with MBSFN subframe of 4 cell special antenna ports, if the number of RBs is more than 10, the number of symbols occupied by PDCCH on the subframe is 2, if the number of downlink RBs is less than or equal to 10, the number of symbols occupied by PDCCH on the subframe is 2; 4. MBSFN sub-frames with subcarrier spacing of 7.5kHz or 1.25kHz, wherein if the number of RBs is more than 10, the number of symbols occupied by the PDCCH on the sub-frames is 0, and if the number of downlink RBs is less than or equal to 10, the number of symbols occupied by the PDCCH on the sub-frames is 0; 5. a non-MBSFN subframe (except subframe 6 of subframe structure type 2) configured with a positioning reference signal, wherein if the number of RBs is more than 10, the number of symbols occupied by the PDCCH on the subframe is 1 or 2 or 3, and if the number of downlink RBs is less than or equal to 10, the number of symbols occupied by the PDCCH on the subframe is 2 or 3; 6. otherwise, if the number of RBs is greater than 10, the number of symbols occupied by the PDCCH on the subframe is 1 or 2 or 3, and if the number of downlink RBs is less than or equal to 10, the number of symbols occupied by the PDCCH on the subframe is 2 or 3 or 4.

TABLE 2

In summary, the UE detects and obtains the CFI information in the PCFICH, determines the number of symbols occupied by the PDCCH in the time domain, and then performs blind detection on the determined PDCCH to obtain information such as DCI, that is, the UE needs to detect both the PCFICH and the PDCCH successfully to obtain DCI information.

Similar to PDCCH, Enhanced Physical Downlink Control Channel (EPDCCH) carries scheduling information and is transmitted using one or several aggregated Enhanced Control Channel Elements (ECCEs). The number of ECCEs used by the EPDCCH of different formats is shown in table 3, where the maximum aggregation level supported by the EPDCCH is 32 according to the number of used ECCEs, specifically, the format of the EPDCCH is 0, the number of ECCEs used by the EPDCCH is 2 in Case a local transmission (Localized transmission), the number of ECCEs used by the EPDCCH is 2 in Case a Distributed transmission (Distributed transmission), the number of ECCEs used by the EPDCCH is 1 in Case B local transmission, and the number of ECCEs used by the EPDCCH is 1 in Case B Distributed transmission; the format of the EPDCCH is 1, the number of ECCEs used by the EPDCCH is 4 during local transmission in Case A, the number of ECCEs used by the EPDCCH is 4 during distributed transmission in Case A, the number of ECCEs used by the EPDCCH is 2 during local transmission in Case B, and the number of ECCEs used by the EPDCCH is 2 during distributed transmission in Case B; the format of the EPDCCH is 2, the number of ECCEs used by the EPDCCH is 8 in Case a local transmission, the number of ECCEs used by the EPDCCH is 8 in Case a distributed transmission, the number of ECCEs used by the EPDCCH is 4 in Case B local transmission, and the number of ECCEs used by the EPDCCH is 4 in Case B distributed transmission; the format of the EPDCCH is 3, the number of ECCEs used by the EPDCCH is 16 in Case a local transmission, the number of ECCEs used by the EPDCCH is 16 in Case a distributed transmission, the number of ECCEs used by the EPDCCH is 8 in Case B local transmission, and the number of ECCEs used by the EPDCCH is 8 in Case B distributed transmission; the format of the EPDCCH is 4, the number of ECCEs used by the EPDCCH is not configured in local transmission in Case a, the number of ECCEs used by the EPDCCH is 32 in distributed transmission in Case a, the number of ECCEs used by the EPDCCH is not configured in local transmission in Case B, and the number of ECCEs used by the EPDCCH is 16 in distributed transmission in Case B.

TABLE 3

Similarly, the number of ECCEs used by MTC Physical Downlink Control Channels (MPDCCH) in different formats is shown in table 4, where it is known that the maximum aggregation level supported by the MPDCCH is 24 according to the number of ECCEs used, specifically, the format of the MPDCCH is 0, where when the number of Enhanced Resource Element Groups (EREGs) included in one ECCE is 4, the number of ECCEs used by the MPDCCH is 2 in local transmission (Localized transmission), and when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH is 2 in Distributed transmission (Distributed transmission), and when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH is 1 in local transmission, and when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the Distributed dcch is 1 in Distributed transmission; the format of the MPDCCH is 1, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in local transmission is 4, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in distributed transmission is 4, when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH in local transmission is 2, when the number of EREGs included in one ECCE is 8, and the number of ECCEs used by the MPDCCH in distributed transmission is 2; the format of the MPDCCH is 3, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in local transmission is 8, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in distributed transmission is 8, when the number of EREGs included in one ECCE is 8, when the number of EREGs included in the MPDCCH in local transmission is 4, when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH in distributed transmission is 4; the format of the MPDCCH is 3, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in local transmission is 16, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in distributed transmission is 16, when the number of EREGs included in one ECCE is 8, when the number of EREGs included in the MPDCCH in local transmission is 8, when the number of EREGs included in one ECCE is 8, and when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH in distributed transmission is 8; the format of the MPDCCH is 1, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in local transmission is not configured, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in distributed transmission is not configured, when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH in local transmission is not configured, and when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH in distributed transmission is not configured; the format of the MPDCCH is 5, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in local transmission is 24, when the number of EREGs included in one ECCE is 4, the number of ECCEs used by the MPDCCH in distributed transmission is 24, when the number of EREGs included in one ECCE is 8, the number of ECCEs used by the MPDCCH in local transmission is 12, when the number of EREGs included in one ECCE is 8, and the number of ECCEs used by the MPDCCH in distributed transmission is 12.

TABLE 4

The CCE aggregation level of an existing general UE is up to 8, and the UE can only perform blind detection on PDCCHs with an aggregation level not exceeding 8, whereas if the aggregation level of a PDCCH transmitted by a base station exceeds 8, such as 16 or 24, for an existing UE which supports only the CCE aggregation level 8 at most, the UE cannot detect the PDCCH transmitted by the base station in a blind manner, and cannot detect information such as DCI.

In view of this, in order to ensure that the PDCCH sent by the network device can be blindly detected by the terminal when the aggregation level of the PDCCH sent by the network device is greater than the aggregation level supported by the terminal, so as to improve the success rate of PDCCH detection, an embodiment of the present application provides a method for detecting the PDCCH.

Specifically, in the method, a first UE accesses a broadcast dedicated carrier, detects at least one first PDCCH candidate in a PDCCH candidate set on the broadcast dedicated carrier, where the first PDCCH candidate is composed of N × L CCEs, and starting positions of code bit collection of the first (N/2) × L CCEs and the last (N/2) × L CCEs are the same in the N × L CCEs, and the first UE can detect the first PDCCH candidate composed of N × L CCEs, so when an aggregation level of PDCCHs transmitted by a network device is greater than or equal to an aggregation level of the first UE, the first UE can detect the PDCCHs by combining the CCEs, thereby improving a success rate of PDCCH detection.

Example one

The following embodiments are used to describe the specific procedure of PDCCH detection in detail, and refer to the PDCCH detection procedure shown in fig. 3, which includes:

step 301: the network equipment sends a signal for the UE to access to on the broadcast dedicated carrier.

The UE in step 301 may include a first UE and a second UE in the embodiment of the present application.

Illustratively, the information sent by the network device for UE access includes a synchronization signal and an MBMS master information block carried by a physical broadcast channel PBCH.

Specifically, the broadcast dedicated carrier includes a carrier used for carrying data information and/or control information in a multimedia broadcast multicast service dedicated (MBMS-dedicated) cell, or a carrier used for carrying data information and/or control information in a multimedia broadcast multicast service/Unicast-mixed (MBMS/Unicast-mixed) cell, or a carrier used for carrying data information and/or control information in a further enhanced multimedia broadcast multicast service/Unicast-mixed (femmbms/Unicast-mixed) cell. And the UE accesses the broadcast special carrier, and the UE accesses the broadcast special carrier at least comprises the information of the UE detection synchronization signal, the UE acquisition main information block and the like. The UE detects a primary synchronization signal PSS and a secondary synchronization signal SSS sent by network equipment, the UE and a cell corresponding to the network equipment acquire time and frequency synchronization, and the UE determines a physical cell identifier and a cell identifier group number to which the physical cell identifier belongs. The cell is a cell to which data information and/or control information carried on a broadcast dedicated carrier belongs. And the UE decodes the physical broadcast channel PBCH to obtain information such as a master information block MIB and a system information block SIB1 of the cell. The MIB also comprises MIB-MBMS sent by a special cell of multimedia broadcast multicast service (MBMS-dedicated), and comprises information such as downlink system bandwidth, wireless system frame number SFN and the like; the system message block SIB1 also includes SIB1-MBMS sent by a multimedia broadcast multicast service (MBMS-dedicated) dedicated cell, containing scheduling information for System (SI) messages.

Step 302: the first UE receives a signal for UE access and accesses a broadcast dedicated carrier.

A UE accessing a broadcast dedicated carrier (also referred to as "broadcast UE") is a UE receiving data of a broadcast and/or multicast service, and may determine whether the UE is a broadcast UE by one or more of the following ways: the UE works on an MBMS related cell, wherein the MBMS related cell comprises one or more of an MBMS/unicast mixed cell, a FeMBMS/unicast mixed cell and an MBMS special cell; and the UE detects that a Cyclic Redundancy Check (CRC) is scrambled by the M-RNTI.

For example, in the embodiment of the present application, the first UE refers to a UE of a high release, that is, a UE supporting protocols of 16 and more releases, and the first UE is also referred to as a new UE. For example, the aggregation capability of the first UE is 4 or 8, 16 or higher, etc. More specifically, the first UE may be a UE supporting the detection method of the PDCCH in the embodiment of the present application.

Optionally, the first UE may obtain the first capability of the first UE, and the first capability of the first UE may be used to indicate the aggregation capability of the first UE.

The first capability includes at least one of:

the first UE supports a version 16 protocol;

the first UE supports release 16 broadcast or multicast features.

The first capability of the first UE may be a pre-agreed capability, or may be a first capability indicated by the network device.

Correspondingly, in order to distinguish from the first UE, a second UE is also proposed in the embodiment of the present application, where the second UE refers to a UE of a low version, that is, a UE that does not support a protocol of a version 16 or more, that is, a UE that only supports a protocol of a version 16 or less, and the second UE is also referred to as an old UE. For example, the aggregation capability of the second UE is 4 or 8, etc. More specifically, the second UE may be a UE that does not support the detection method of the PDCCH in the embodiment of the present application.

Optionally, after the network device confirms that the first UE accesses the broadcast dedicated carrier, the network device sends, to the first UE, indication information on the broadcast dedicated carrier, where the indication information is used to indicate a first capability of the first UE (for example, an aggregation capability of the first UE), and/or is used to indicate the first UE to detect at least one first PDCCH candidate.

Step 303: the first UE detects at least one first PDCCH candidate in the PDCCH candidate set on the broadcast dedicated carrier, the first PDCCH candidate is composed of N × L CCEs, the starting positions of the code bit collection of the front (N/2) × L CCEs and the rear (N/2) × L CCEs respectively forming the first PDCCH candidate are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.

Optionally, the first (N/2) × L CCEs and the second (N/2) × L CCEs respectively constitute two second PDCCH candidates.

Optionally, the first (N/2) × L CCEs, and the second (N/2) × L CCEs respectively constitute a second PDCCH candidate and a third PDCCH candidate. For example, the first (N/2) × L CCEs constitute a second PDCCH candidate, and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or the first (N/2) × L CCEs constitute a third PDCCH candidate, and the second (N/2) × L CCEs constitute a second PDCCH candidate. And if the scrambling and/or interleaving of the third PDCCH candidate is different from the scrambling and/or interleaving of the second PDCCH candidate, that is, the process of generating the scrambling and/or interleaving of the third PDCCH candidate by the network device is different from the process of generating the scrambling and/or interleaving of the second PDCCH candidate, the process of descrambling and/or deinterleaving the third PDCCH candidate by the corresponding first UE is different from the process of descrambling and/or deinterleaving the second PDCCH candidate by the corresponding first UE.

Taking the first UE to detect one first PDCCH candidate in the PDCCH candidate set as an example, to describe how the network device sends PDCCH candidates on a broadcast dedicated carrier, if the first (N/2) × L CCEs and the last (N/2) × L CCEs respectively form two second PDCCH candidates, the one first PDCCH candidate may be regarded as being composed of two second PDCCH candidates, and if the first (N/2) × L CCEs form a second PDCCH candidate, the last (N/2) × L CCEs form a third PDCCH candidate; or the first (N/2) × L CCEs form a third PDCCH candidate, the second (N/2) × L CCEs form a second PDCCH candidate, and the first PDCCH candidate may be regarded as being composed of the second PDCCH candidate and the third PDCCH candidate.

The UE includes a first UE and a second UE.

For a first UE, if the first UE determines to detect a first PDCCH candidate, the first UE receives two second PDCCH candidates, and then uses the two second PDCCH candidates as a first PDCCH candidate, and the first UE detects the first PDCCH candidate. Thus, compared with the second UE, the aggregation level capability supported by the first UE is higher, or the first UE can jointly decode the two repeated second candidates, so that the decoding capability of the UE is improved.

Wherein the first UE determines whether to detect the first PDCCH candidate or not, which will be described in detail below.

For the second UE, after receiving the two second PDCCH candidates, the second UE detects the two second PDCCH candidates respectively. In this way, the aggregation level N × L is divided into two independent parts (i.e., two second PDCCHs) which are independent of each other and have the same starting position of the coded bit collection of the CCE, and therefore, the second UE can decode the two second PDCCHs independently.

If the second UE receives a fourth PDCCH candidate, the fourth PDCCH candidate is composed of N × L CCEs, and the starting positions of the code bit collection of the front (N/2) × L CCEs and the rear (N/2) × L CCEs respectively composing the fourth PDCCH candidate are different. After receiving the fourth PDCCH candidate, the second UE can only detect the first (N/2) × L CCEs, and cannot detect the last (N/2) × L CCEs. Compared with the two second PDCCH candidates received by the second UE, the second UE receives one fourth PDCCH candidate, and can only detect one CCE with a length of (N/2) × L, so that the decoding capability of the second UE is reduced. For example, when N is 2 and L is 8, the aggregation level of the fourth PDCCH candidate is 16, the starting positions of the coded bit collections of the first 8 CCEs and the last 8 CCEs constituting the fourth PDCCH candidate are different, and if the starting position of the coded bit collection of the first 8 CCs is 0 and the starting position of the coded bit collection of the last 8 CCEs is 8, the second UE can only detect the first 8 CCEs and cannot detect the last 8 CCEs after receiving the fourth PDCCH candidate, where the first 8 CCEs and the last 8 CCEs can be understood as PDCCH candidates with an aggregation level of 8.

In another implementation, the network device sends one first PDCCH candidate to the UE on a broadcast dedicated carrier.

Specifically, the network device sends at least one first PDCCH candidate in the PDCCH candidate set to the UE on the dedicated broadcast carrier, where the first PDCCH candidate is composed of N × L CCEs, where the starting positions of the coded bit collection of the first (N/2) × L CCEs and the last (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.

Optionally, the first PDCCH candidate consists of two second PDCCH candidates, or the first PDCCH candidate consists of one second PDCCH candidate and (at least) one third PDCCH candidate, and the third PDCCH candidate is scrambled and/or interleaved differently from the second PDCCH candidate.

The network device scrambles or interleaves to generate a third PDCCH candidate and implements PDCCH detection, and the first UE descrambles or deinterleaves the third PDCCH candidate, and the process of implementing PDCCH detection may refer to the following fourth and fifth embodiments.

It should be noted that, in the present application, two second PDCCH candidates are described, and when a first PDCCH candidate is composed of a second PDCCH candidate and a third PDCCH candidate, the detection process of the two second PDCCH candidates is similar, and details are not repeated here.

For the first UE, the first UE detects the received one first PDCCH candidate.

For the second UE, the second UE cannot detect the first PDCCH candidate due to limited second UE capability.

The set of PDCCH candidates comprises at least one second PDCCH candidate. The number of second PDCCH candidates included in the PDCCH candidate set may be seen in table 1, for example, in the common search space, two second PDCCH candidates correspond to a UE with an aggregation level of 8. In particular, the aggregation level of the second PDCCH candidate is 8 and the number of second PDCCH candidates comprised in the PDCCH candidate set is 2.

Each merged first PDCCH candidate is composed of N × L CCEs, L is an integer greater than or equal to 8, and optionally, L may be an aggregation capability level corresponding to the second PDCCH candidate before being merged. For example, if L is 8 and N is 2, the first PDCCH candidate consists of 2 × 8 CCEs, i.e. 16 CCEs, and the first PDCCH can be regarded as consisting of 2 second PDCCH candidates with an aggregation level of 8. For the case where N and L are other values, it may be said that L takes 8 and N takes 2, which are not described in detail in this embodiment of the present application.

For example, as shown in fig. 4, for a first PDCCH candidate with an aggregation level of 16, CCE indexes of two second PDCCH candidates with an aggregation level of 8 are 0 to 7 and 8 to 15, respectively, and then the CCE indexes constitute a first coded bit from 0 to 7, the CCE indexes constitute a second coded bit from 8 to 15, the two second PDCCH candidates are constituted as one first PDCCH candidate with an aggregation level of 16, and CCE logical numbers constitute coded bits of the first PDCCH candidate from 0 to 15.

As shown in fig. 5, for a first PDCCH candidate with an aggregation level of 16, CCE indexes of two second PDCCH candidates with an aggregation level of 8 are 0 to 7 and 8 to 15, respectively, and the CCE indexes constitute first coded bits from 0 to 7 and second coded bits from 8 to 15, and the two second PDCCH candidates are grouped into one first PDCCH candidate.

The starting positions of the collection of the coded bits of the first (N/2) × L CCEs and the second (N/2) × L CCEs respectively forming the first PDCCH candidate are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.

The starting position of the CCE coding bit collection is a sequence e carried on the CCE after bit collection_kThe first bit in the sequence w before bit collection or the bit index of the sequence w before the bit collection.

For example, as shown in fig. 4, L is 8, N is 2, the aggregation level of the first PDCCH candidate is 16, the first (N/2) × L CCEs, i.e., the first 8 CCEs, the CCE indexes are 0 to 7, and the first bit after collecting the code bit of CCE index 0 is e₀The first bit after the collection of coded bits is e₀The bit before collection of the corresponding coded bit is w₀Then, the starting position of the code bit collection of the first 8 CCEs is the starting position of the code bit collection at CCE index 0, which is w₀Or 0. The last (N/2) × L CCEs, i.e. the last 8 CCEs, the CCE indexes are 8 to 15, and the first bit after the collection of the code bits of CCE index 8 is e₀The first bit after the collection of coded bits is e₀The bit before collection of the corresponding coded bit is w₀Then, the starting position of the code bit collection of the last 8 CCEs is the starting position of the code bit collection on CCE index 0, which is w₀Or 0.

In brief, the same starting position of the collection of the code bits of the first (N/2) × L CCEs and the second (N/2) × L CCEs constituting the first PDCCH candidate refers to the first bit in the sequence after the collection of the code bit corresponding to the first CCE in the first (N/2) × L CCEs, the bit in the sequence before the collection of the corresponding code bit or the bit index in the sequence before the collection of the corresponding code bit is at least one same as the first bit in the sequence after the collection of the code bit corresponding to the first CCE in the second (N/2) × L CCEs or the bit index in the sequence before the collection of the corresponding code bit.

Optionally, the first PDCCH candidate consists of N × L consecutive CCEs starting from a first starting CCE, where the first starting CCE is CCE index 0. Also taking fig. 4 as an example, CCE indexes of two candidate PDCCHs are consecutive and 0 to 7 and 8 to 15, respectively.

Optionally, the first PDCCH candidate is in a common search space, or the first PDCCH candidate may be said to belong to the common search space. That is, the first UE monitors the first PDCCH candidate in the common search space.

Optionally, the DCI information and/or the redundancy information carried in each second PDCCH candidate is the same.

For example, the first UE determines to detect the first PDCCH candidate, which may be when determining that one or more of the following conditions are satisfied:

In one implementation, the network device sends an indication to the first UE to detect the first PDCCH candidate, and the first UE may receive the indication sent by the network device to detect the first PDCCH candidate.

Optionally, the indication to detect the first PDCCH candidate is indicated by an MBMS master information block carried by the PBCH. For example, the MBMS master information block includes one of a Master Information Block (MIB), MIB-MBMS, SIB1, and SI. For example, the indication to detect the first PDCCH candidate is at least one information in an MBMS master information block carried by a PBCH, i.e. at least one information in an MBMS master information block carried by a PBCH is used to indicate the (first) UE to detect the first PDCCH candidate.

Taking the example that the network device sends the instruction for detecting the first PDCCH candidate, if the first UE receives the instruction for detecting the first PDCCH candidate sent by the network device, the first UE combines and receives the two received second PDCCH candidates with aggregation level of 8 to improve the success rate of blind detection, and if the first UE does not receive the instruction for detecting the first PDCCH candidate sent by the network device, the first UE performs blind detection on the two received second PDCCH candidates with aggregation level of 8, respectively, without performing differential combination.

Illustratively, the network device indicates in the MBMS master information block by at least one information, such as by 3 bits (bits), where 3 bits respectively indicate whether the first UE supports the aggregation level 4/8/16, such as by 2 bits, and 2 bits respectively indicate whether the first UE supports the aggregation level 4/8.

For another example, the network device indicates the bit status value through at least one piece of information in the MBMS master information block, and associates the bit status value with the aggregation level that the first UE has agreed in advance to use the PDCCH. For example, as shown in table 5, bit status values 00/01/10 correspond to PDCCH aggregation levels 4/8/16, respectively, and bit status value 11 does not have a corresponding PDCCH aggregation level.

TABLE 5

Bit field	Message
00	4
01	8
10	16
11	Spare

Optionally, the PDCCH aggregation level corresponding to the bit status value may indicate that the aggregation level supported by the first UE is one or more of 4/8/16.

That is, the bit status value is the only aggregation level supported by the first UE, for example, the bit status value is 01, the corresponding aggregation level is 8, and the first UE can only use the aggregation level 8 to detect the first PDCCH candidate.

Optionally, the PDCCH aggregation level corresponding to the bit status value may be a minimum aggregation level supported by the first UE. For example, the bit status value is 01, the corresponding aggregation level is 8, and the first UE can detect the first PDCCH candidate using aggregation levels 8 and 16.

Optionally, the maximum aggregation level supported by the first UE may be used. For example, if the bit status value is 01 and the corresponding aggregation level is 8, the first UE can detect the first PDCCH candidate using

aggregation levels

4 and 8.

For the second UE, the second UE does not support receiving the MBMS master information block to acquire the aggregation level supported by the PDCCH, and the second UE cannot acquire information of the aggregation level in the MBMS master information block or the bit value acquired in the MBMS master information block is null.

In another possible implementation, the first UE determines that a first PDCCH candidate is pre-agreed upon, and then determines that detection of the first PDCCH candidate is supported, where the first UE pre-agrees with a network device (e.g., a base station) on the first PDCCH candidate.

Taking the first UE pre-agreeing with the first PDCCH candidate as an example, if the first UE determines that the first UE is a UE receiving the MBMS service, the first UE performs combined reception on two second PDCCH candidates with aggregation level 8 detected in the common search space.

In yet another possible implementation, the first UE determines to support detection of the first PDCCH candidate according to its first capability, which may be referred to in step 301.

In summary, the first UE can use a plurality of second PDCCH candidates as a first PDCCH candidate with a higher aggregation level, thereby improving the success rate of PDCCH blind detection, and the second UE can directly perform blind detection on the received second PDCCH candidates.

Example two

In addition, in the prior art, the UE may determine the control format indicator CFI by receiving a higher layer parameter, but the CFI is not obtained through the FCFICH, specifically if the UE configures a higher layer parameter semistatic CFI-slotsubslotnombsfn or semistatic CFI-subframennombsfn, for a non-MBSFN subframe, the CFI value is equal to the higher layer parameter. If the UE configures the higher layer parameter semiStaticCFI-SlotSubslotMBSFN or semiStaticCFI-subframe MBSFN, for MBSFN subframes, the CFI value is equal to the higher layer parameter. But only when the UE is in a CONNECTED (RRC _ CONNECTED) state, the higher layer signaling indicating the CFI can be received. However, the UE in the MBMS dedicated cell is in an IDLE (RRC _ IDLE) state, and cannot configure the CFI through the above-mentioned high layer signaling.

In view of this, an embodiment of the present application further provides a method for configuring a CFI, where the method indirectly increases a PDCCH blind detection success rate by statically configuring the CFI. Optionally, the configuration method of the CFI may be used in combination with the PDCCH detection method, so as to further improve the PDCCH blind detection success rate.

For example, the CFI configuration method is only applied to a new UE, i.e. the first UE in the PDCCH detection method of the first embodiment.

The UE determines a CFI, wherein the CFI is used for indicating the number of symbols occupied by PDCCH transmission in one subframe, and the CFI is determined by at least one of the following modes:

the UE determines the CFI according to the received third information;

the UE determines the CFI according to a predefined definition;

and the UE detects the downlink control information PDCCH according to the CFI.

Illustratively, the third information and/or the fourth information is carried in an MBMS master information block. For example, the MBMS master information block includes one of a Master Information Block (MIB), MIB-MBMS, SIB1, SI.

Correspondingly, the network device may send the third information and/or the fourth information to the UE.

For example, the network device may send the third information and/or the fourth bearer in an MBMS master information block to the UE.

In one implementation, the third information indicates the value of the CFI by 1-bit or 2-bit.

The range of the value of the CFI indicated by the third information through the 1-bit may be one, two, three, or four, that is, the value of the CFI to be indicated is selected among one value, or the value of the CFI to be indicated is selected among two values, or the value of the CFI to be indicated is selected among three values, or the value of the CFI to be indicated is selected among four values. For example, when the range of the values of the CFI to be indicated is one, the value of the CFI to be indicated is selected in 1, or the value of the CFI to be indicated is selected in 2, or the value of the CFI to be indicated is selected in 3, or the range of the values of the CFI to be indicated is selected in 4, etc., when the range of the values of the CFI to be indicated is two, the value of the CFI to be indicated is selected in 1 and 2, or the value of the CFI to be indicated is selected in 1 and 3, or the value of the CFI to be indicated is selected in 2 and 3, when the range of the values of the CFI to be indicated is three, the value of the CFI to be indicated is selected in 1,2 and 3, or the value of the CFI to be indicated is selected in 2,3 and 4, or the value of the CFI to be indicated is selected in 1,2 and 4, or the value of the CFI to be indicated is selected in 1,3 and 4, when the range of the values of the CFI to be four, the value of the CFI to be indicated is chosen among 1,2,3 and 4.

For example, the third information indicates the value of the CFI by 1 bit, including one of the following cases:

1; or

2; or

3; or

4; or

1 and 2; or

1 and 3; or

One of 2 and 3; or

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

Optionally, when the value of the 1-bit is 0, the indicated CFI value is 1 or 2 or 3 or 4. For example, a 1-bit value of 0 indicates a CFI value of 1, and a 1-bit value of 1 does not indicate any value.

Optionally, when the value of the 1-bit is {0,1}, the 2 CFI values respectively corresponding to the 1-bit may be one of {1,2}, {1,3}, {1,4}, {2,3}, {2,4} and {3,4 }. For example, 1 bit {0,1} corresponds to the CFI value {1,2}, i.e., a bit of the information is 0 indicating a CFI of 1, and a bit of 1 indicating a CFI of 2.

Optionally, when the value of the 1-bit includes {0,1}, the value 0 indicates that the third information is not used to indicate the CFI value, and the value 1 may indicate that the corresponding CFI value is 1,2,3, or 4.

Alternatively, when the value of the 1-bit includes {0,1}, the value 1 indicates that the third information is not used to indicate the CFI value, and the value 0 may indicate that the corresponding CFI value is 1,2,3, or 4.

The range of the value of the CFI indicated by the third information through the 2-bit may be one, two, three, or four, that is, the value of the CFI to be indicated is selected among one value, or the value of the CFI to be indicated is selected among two values, or the value of the CFI to be indicated is selected among three values, or the value of the CFI to be indicated is selected among four values. For example, when the range of the values of the CFI to be indicated is one, the value of the CFI to be indicated is selected in 1, or the value of the CFI to be indicated is selected in 2, or the value of the CFI to be indicated is selected in 3, or the range of the values of the CFI to be indicated is selected in 4, etc., when the range of the values of the CFI to be indicated is two, the value of the CFI to be indicated is selected in 1 and 2, or the value of the CFI to be indicated is selected in 1 and 3, or the value of the CFI to be indicated is selected in 2 and 3, when the range of the values of the CFI to be indicated is three, the value of the CFI to be indicated is selected in 1,2 and 3, or the value of the CFI to be indicated is selected in 2,3 and 4, or the value of the CFI to be indicated is selected in 1,2 and 4, or the value of the CFI to be indicated is selected in 1,3 and 4, when the range of the values of the CFI to be four, the value of the CFI to be indicated is chosen among 1,2,3 and 4.

For another example, the third information indicates the value of the CFI by 2 bits, including one of:

1; or

2; or

3; or

4; or

1 and 2; or

1 and 3; or

One of 2 and 3; or

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

As another example, the third information indicates the value of the CFI by 2 bits, including one of:

1 and 2; or

1 and 3; or

1 and 4; or

2 and 3; or

2 and 4; or

3 and 4; or

1,2 and 3; or

2,3 and 4; or

1,2 and 4; or

1,3 and 4; or

1,2,3 and 4.

For example, a 2-bit value of {00,01,10,11} may correspond to a CFI value of {1,2,3,4} in a one-to-one manner, where a bit of 00 indicates a CFI of 1, a bit of 01 indicates a CFI of 2, a bit of 10 indicates a CFI of 3, and a bit of 11 indicates a CFI of 4. Or, as another example, the value of 2 bits is {00,01,10,11}, bit 00 indicating a CFI of 1, bit 01 indicating a CFI of 2, bit 10 indicating a CFI of 3, 11 does not indicate any value.

Optionally, the value of the 2-bit is {00,01,10,11}, where 00 denotes that the third information is not used to indicate the CFI value, {01,10,11} may denote the CFI value {1,2,3}, or {1,2,4}, or {1,3,4}, or {2,3,4 }. For example, the value of 2 bits is {00,01,10,11}, where 00 indicates that no third information is used to indicate a CFI value, 01 indicates that the corresponding CFI value is 1,10 indicates that the corresponding CFI value is 2, and 11 indicates that the corresponding CFI value is 3.

Alternatively, the value of the 2-bit is {00,01,10,11}, where 11 denotes that the third information is not used to indicate the CFI value, {00,01,10} may denote the CFI value {1,2,3}, or {1,2,4}, or {1,3,4}, or {2,3,4 }. For example, the value of 2 bits is {00,01,10,11}, where 11 indicates that no third information is used to indicate a CFI value, 00 indicates that the corresponding CFI value is 1, 01 indicates that the corresponding CFI value is 2, and 11 indicates that the corresponding CFI value is 3.

In this implementation, after determining the value of the CFI to be indicated for the UE, the network device determines a 1-bit value or a 2-bit value corresponding to the value of the CFI indicated for the UE, and the third information carries the 1-bit value or the 2-bit value. The UE receives the third information, and can determine, through the value of the 1 bit or the value of the 2bit carried in the third information, the value of the CFI corresponding to the value of the 1 bit or the value of the CFI corresponding to the value of the 2bit, so that the UE determines the value of the CFI indicated by the network device for the UE.

In another implementation, the UE determines the CFI value according to a predefined definition, the CFI value comprising one of 1,2,3, and 4.

In this implementation, the UE directly determines the value of the predefined CFI.

In yet another implementation, the UE determines the CFI according to a first corresponding relationship and fourth information, where the fourth information is used to indicate a system bandwidth or a number of RBs of a resource block, where the first corresponding relationship includes a corresponding relationship between a numerical value of the system bandwidth and a numerical value of the CFI, or a corresponding relationship between a number of RBs and a numerical value of the CFI.

In this implementation, after determining the value of the CFI to be indicated for the UE, the network device determines, through the correspondence between the value of the system bandwidth and the value of the CFI included in the first correspondence, the value of the system bandwidth corresponding to the value of the CFI indicated for the UE, and carries the value of the system bandwidth in the fourth information. The UE receives the fourth information, and determines, through the numerical value of the system bandwidth carried in the fourth information and the first corresponding relationship, the numerical value of the CFI corresponding to the numerical value of the system bandwidth in the first corresponding relationship, so that the UE determines the numerical value of the CFI indicated by the network device for the UE.

Or after the network device determines the value of the CFI to be indicated for the UE, the network device determines the number of system RBs corresponding to the value of the CFI indicated for the UE through the correspondence between the value of the system bandwidth and the value of the CFI included in the first correspondence, and the fourth information carries the number of the system RBs. And the UE receives the fourth information, and determines the CFI value corresponding to the system RB number in the first corresponding relation through the system RB number carried in the fourth information and the first corresponding relation, so that the UE determines the CFI value indicated by the network equipment for the UE.

For example, the first corresponding relationship includes a corresponding relationship between a system bandwidth value and a CFI value, or a corresponding relationship between a number of RBs and a CFI value, and includes:

the first corresponding relationship includes a corresponding relationship between a system bandwidth value and a CFI value, or a corresponding relationship between the number of RBs and a CFI value, and includes:

For another example, the first corresponding relationship includes a corresponding relationship between a system bandwidth value and a CFI value, or a corresponding relationship between a number of RBs and a CFI value, and includes:

Additionally, the first corresponding relationship includes a corresponding relationship between a system bandwidth value and a CFI value, or a corresponding relationship between a number of RBs and a CFI value, which includes:

Optionally, the first value may be the same as or different from the second value in this example.

Wherein, for the value of the system bandwidth, the corresponding first value and second value may be one of {1.4,3}, {1.4,5}, {1.4,10}, {1.4,15}, {1.4,20}, {3,5}, {3,10}, {3,15}, {3,20}, {5,10}, {5,15}, {5,20}, {10,15}, {10,20}, and {15,20 }. The corresponding first, second, and third numerical values may be one of {1.4,3,5}, {1.4,3,10}, {1.4,3,15}, {1.4,3,20}, {1.4,5,10}, {1.4,5,15}, {1.4,5,20}, {1.4,10,15}, {1.4,10,20}, {1.4,15,20}, {3,5,10}, {3,5,15}, {3,5,20}, {3,10,15}, {3,10,20}, {3,15,20}, {5,10,15}, {5,10,20}, {5,15,20}, and {10,15,20 }.

Alternatively, for the value of the system bandwidth, the corresponding first value and second value may be one of {1.4,1.4}, {3,3}, {5,5}, {10,10}, {15,15}, {20,20}, in the following.

For the number of RBs, the corresponding first and second values may be one of {6,15}, {6,25}, {6,50}, {6,75}, {6,100}, {15,25}, {15,50}, {15,75}, {15,100}, {25,50}, {25,75}, {25,100}, {50,75}, {50,100}, and {75,100}, among the following. The corresponding first, second, and third values may be one of {6,15,25}, {6,15,50}, {6,15,75}, {6,15,100}, {6,25,50}, {6,25,75}, {6,25,100}, {6,50,75}, {6,50,100}, {6,75,100}, {15,25,50}, {15,25,75}, {15,25,100}, {15,50,75}, {15,50,100}, {15,75,100}, {25,50,75}, {25,50,100}, {25,75,100}, and {50,75,100}, among the following.

Alternatively, for the number of RBs, the corresponding first and second values may be one of {6,6}, {15,15}, {25,25}, {50,50}, {75,75}, {100,100}, among the following.

Specific first correspondence relationships can be shown in tables 6 to 25 below, and tables 6 to 25 are explained in order below.

The first corresponding relationship in table 6 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where the Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by the PDCCH. Specifically, when the value of the system bandwidth is greater than or equal to X2, the corresponding CFI value is 1, when the value of the system bandwidth is less than X2 and the value of the system bandwidth is greater than or equal to X1, the corresponding CFI value is 2, and when the value of the system bandwidth is less than X1, the corresponding CFI value is 3.

TABLE 6

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>＝X2	1
X1<＝BW<X2	2
BW<X1	3

The first corresponding relationship in table 7 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where the Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by the PDCCH. Specifically, when the value of the system bandwidth is greater than X2, the corresponding CFI value is 1, when the value of the system bandwidth is less than or equal to X2 and the value of the system bandwidth is greater than X1, the corresponding CFI value is 2, and when the value of the system bandwidth is less than or equal to X1, the corresponding CFI value is 3.

TABLE 7

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>X2	1
X1<BW<＝X2	2
BW<＝X1	3

The first corresponding relationship in table 8 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where the Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, that is, the Number of OFDM symbols occupied by the PDCCH. Specifically, when the value of the system bandwidth is greater than or equal to X3, the corresponding CFI value is 1, when the value of the system bandwidth is less than X3 and the value of the system bandwidth is greater than or equal to X2, the corresponding CFI value is 2, when the value of the system bandwidth is less than X2 and the value of the system bandwidth is greater than or equal to X1, the corresponding CFI value is 3, and when the value of the system bandwidth is less than X1, the corresponding CFI value is 4.

TABLE 8

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>＝X3	1
X2<＝BW<X3	2

X1<＝BW<X2	3
BW<X1	4

The first corresponding relationship in table 9 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where the Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, that is, the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than X3, the corresponding CFI value is 1, when the value of the system bandwidth is less than or equal to X3 and the value of the system bandwidth is greater than X2, the corresponding CFI value is 2, when the value of the system bandwidth is less than or equal to X2 and the value of the system bandwidth is greater than X1, the corresponding CFI value is 3, and when the value of the system bandwidth is less than or equal to X1, the corresponding CFI value is 4.

TABLE 9

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>X3	1
X2<BW<＝X3	2
X1<BW<＝X2	3
BW<＝X1	4

The first correspondence in table 10 includes a correspondence of the number of RBs to the number of CFIs, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RBs is greater than or equal to X2, the corresponding CFI value is 1, when the number of RBs is less than X2 and the number of RBs is greater than or equal to X1, the corresponding CFI value is 2, and when the number of RBs is less than X1, the corresponding CFI value is 3.

Watch 10

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>＝X2	1
X1<＝N _RB<X2	2
N _RB<X1	3

The first correspondence in table 11 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RBs is greater than X2, the corresponding CFI value is 1, when the number of RBs is less than or equal to X2 and the number of RBs is greater than X1, the corresponding CFI value is 2, and when the number of RBs is less than or equal to X1, the corresponding CFI value is 3.

TABLE 11

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>X2	1
X1<N _RB<＝X2	2
N _RB<＝X1	3

The first correspondence in table 12 includes a correspondence of the number of RBs to the number of CFIs, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RBs is greater than or equal to X3, the corresponding CFI value is 1, when the number of RBs is less than X3 and the number of RBs is greater than or equal to X2, the corresponding CFI value is 2, when the number of RBs is less than X2 and the number of RBs is greater than or equal to X1, the corresponding CFI value is 3, and when the number of RBs is less than X1, the corresponding CFI value is 4.

TABLE 12

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>＝X3	1
X2<＝N _RB<X3	2
X1<＝N _RB<X2	3
N _RB<X1	4

The first correspondence in table 13 includes a correspondence of the number of RBs to the number of CFIs, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RBs is greater than X3, the corresponding CFI value is 1, when the number of RBs is less than or equal to X3 and the number of RBs is greater than X2, the corresponding CFI value is 2, when the number of RBs is less than or equal to X2 and the number of RBs is greater than X1, the corresponding CFI value is 3, and when the number of RBs is less than or equal to X1, the corresponding CFI value is 4.

Watch 13

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>X3	1
X2<N _RB<＝X3	2
X1<N _RB<＝X2	3
N _RB<＝X1	4

The first corresponding relationship in table 14 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where the Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than or equal to X2, the corresponding CFI value is 1, and when the value of the system bandwidth is less than X1, the corresponding CFI value is 2. Alternatively, X1 is the same as X2.

TABLE 14

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>＝X2	1
BW<X1	2

The first corresponding relationship in table 15 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than X2, the corresponding CFI value is 1, and when the value of the system bandwidth is less than or equal to X1, the corresponding CFI value is 2. Alternatively, X1 is the same as X2.

Watch 15

Channel bandwidth BW[MHz]

Number of OFDM symbols for PDCCH

BW>X2	1
BW<＝X1	2

The first corresponding relationship in table 16 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than or equal to X2, the corresponding CFI value is 1, and when the value of the system bandwidth is less than X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

TABLE 16

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>＝X2	1
BW<X1	3

The first corresponding relationship in table 17 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than X2, the corresponding CFI value is 1, and when the value of the system bandwidth is less than or equal to X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

TABLE 17

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>X2	1
BW<＝X1	3

The first corresponding relationship in table 18 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than or equal to X2, the corresponding CFI value is 2, and when the value of the system bandwidth is less than X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

Watch 18

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>＝X2	2
BW<X1	3

The first corresponding relationship in table 19 includes a corresponding relationship between a value of the system bandwidth and a value of the CFI, where Channel bandwidth BW represents the value of the system bandwidth, and the unit is megahertz (MHz), and the value of the CFI is represented by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the value of the system bandwidth is greater than X2, the corresponding CFI value is 2, and when the value of the system bandwidth is less than or equal to X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

Watch 19

Channel bandwidth BW[MHz]	Number of OFDM symbols for PDCCH
BW>X2	2
BW<＝X1	3

The first correspondence in table 20 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RBs is greater than or equal to X2, the corresponding CFI value is 1, and when the number of RBs is less than X1, the corresponding CFI value is 2. Alternatively, X1 is the same as X2.

Watch 20

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>＝X2	1
N _RB<X1	2

The first correspondence in table 21 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RB is greater than or equal to X2, the corresponding CFI value is 1, and when the number of RB is less than or equal to X1, the corresponding CFI value is 2. Alternatively, X1 is the same as X2.

TABLE 21

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>X2	1
N _RB<＝X1	2

The first correspondence in table 22 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RBs is greater than or equal to X2, the corresponding CFI value is 1, and when the number of RBs is less than X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

TABLE 22

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>＝X2	1
N _RB<X1	3

The first correspondence in table 23 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RB is greater than X2, the corresponding CFI value is 1, and when the number of RB is less than or equal to X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

TABLE 23

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>X2	1
N _RB<＝X1	3

The first correspondence in table 24 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, and the value of CFI is represented by Number of OFDM symbols for PDCCH, i.e., PDCCH occupancyThe number of OFDM symbols of (a). Specifically, when the number of RBs is greater than or equal to X2, the corresponding CFI value is 2, and when the number of RBs is less than X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

Watch 24

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>＝X2	2
N _RB<X1	3

The first correspondence in table 25 includes a correspondence of the number of RBs to the number of CFI, where Transmission bandwidth configuration N_RBThe Number of RBs, i.e., the Number of RBs of the transmission bandwidth configuration, is indicated by Number of OFDM symbols for PDCCH, i.e., the Number of OFDM symbols occupied by PDCCH. Specifically, when the number of RB is greater than X2, the corresponding CFI value is 2, and when the number of RB is less than or equal to X1, the corresponding CFI value is 3. Alternatively, X1 is the same as X2.

TABLE 25

Transmission bandwidth configuration N _RB	Number of OFDM symbols for PDCCH
N _RB>X2	2
N _RB<＝X1	3

The UE determines the CFI value by receiving the CFI indication information in the MIB or by the corresponding relation between the appointed CFI and the bandwidth (or RB number), and does not need to detect the PCFICH to determine the CFI, thereby finally improving the blind detection success rate of the PDCCH.

In another implementation, the UE determines the CFI according to fifth information and a first corresponding relationship and fourth information, where the fourth information is used to indicate a system bandwidth or a number of RBs of a resource block, where the first corresponding relationship includes a corresponding relationship between a numerical value of the system bandwidth and a numerical value of the CFI, or a corresponding relationship between a number of RBs and a numerical value of the CFI.

For example, the fifth information may include 1 bit, where 0 indicates that the CFI value is not determined using the first correspondence relationship and the fourth information, and 1 indicates that the CFI value is determined using the first correspondence relationship and the fourth information.

For example, the fifth information may include 1 bit, where 1 indicates that the CFI value is determined without using the first correspondence relationship and the fourth information, and 0 indicates that the CFI value is determined using the first correspondence relationship and the fourth information.

If the UE determines, according to the fifth information, to use the first corresponding relationship and the fourth information to determine the CFI value, the process of determining, by the UE, the CFI value according to the first corresponding relationship and the fourth information may refer to the above process, which is not described herein again.

In another implementation, the UE determines the CFI value according to the sixth information and a predefined value, and the CFI value includes one of 1,2,3, and 4.

For example, the sixth information includes 1 bit, 0 indicates that the CFI value is not determined using the predefined definition, and 1 indicates that the CFI value is one of 1,2,3, and 4, i.e., a value of 1 may indicate that the corresponding CFI value is 1, or 2, or 3, or 4.

For example, the sixth information includes 1 bit, 1 indicates that the CFI value is not determined using the predefined definition, and 0 indicates that the CFI value is one of 1,2,3, and 4, i.e., a value of 0 may indicate that the corresponding CFI value is 1, or 2, or 3, or 4.

In summary, by statically configuring the CFI in the method, the UE may or may not determine the CFI by detecting the PCFICH, and the UE can determine the value of the CFI in the connected state or the idle state, thereby improving the success rate of the PDCCH blind detection.

EXAMPLE III

The embodiment of the present application further provides a method for configuring a CFI and detecting a PDCCH, and more specifically, it can be understood that, on the basis of the method for configuring a CFI provided in the second embodiment, the PDCCH detection method provided in the first embodiment is combined to implement PDCCH detection, so as to further improve a PDCCH blind detection success rate.

For example, the UE referred to in the embodiments of the present application mainly refers to a new UE, that is, the first UE in the PDCCH detection method described above.

Specifically, in this embodiment, the CFI is statically configured, the UE does not need to detect the PCFICH to determine the CFI, the UE can determine the value of the CFI in any state, the blind detection success rate of the PDCCH is already improved, the UE detects at least one first PDCCH in the PDCCH candidate set on the broadcast dedicated carrier through the determined value of the CFI, and when the aggregation level of the PDCCH sent by the network device is greater than or equal to the aggregation level supported by the first UE, the first UE can detect the PDCCH by combining CCEs, and the success rate of PDCCH detection is further improved.

The following describes in detail a specific procedure of a third embodiment of the present application, and first refers to the configuration of the CFI and the detection procedure of the PDCCH shown in fig. 6, where the procedure includes:

step 601: the first UE accesses a broadcast dedicated carrier.

For example, the first UE may receive a signal sent by the network device for UE access, and access the broadcast dedicated carrier.

It should be noted that, the execution process of step 601 may refer to the detailed description of step 301 and step 302 in fig. 3, and is not described herein again.

Step 602: the first UE determines a CFI.

It should be noted that, the execution process of step 602 may refer to the specific description in the above embodiment two, and is not described herein again.

Step 603: the network equipment sends at least one first PDCCH candidate in the PDCCH candidate set to the first UE on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L CCEs, the starting positions of the code bit collection of the front (N/2) × L CCEs and the starting positions of the code bit collection of the rear (N/2) × L CCEs which respectively form the first PDCCH candidate are the same, L is an integer which is more than or equal to 8, and N is an even number which is more than 0.

Illustratively, in this step 603, the network device sends (at least one) first PDCCH consisting of (at least) two second PDCCH candidates instead of (at least) two separate second PDCCHs.

It should be noted that, the execution process of step 603 may refer to the detailed description of step 303 in fig. 3, which is not described herein again.

Step 604: the first UE detects at least one first PDCCH candidate in the set of PDCCH candidates on the broadcast dedicated carrier.

It should be noted that, the execution process of step 604 may refer to the detailed description of step 303 in fig. 3, which is not described herein again.

It can be understood that fig. 6 is only an example of the combined use of the first embodiment and the second embodiment to improve the success rate of PDCCH detection, and is not limited to the other combined use of the first embodiment and the second embodiment.

In LTE broadcasting, it is proposed that, in order to enhance the reliability of PDCCH, DCI may be repeatedly transmitted in the same subframe, but there may be an old UE (i.e. a second UE) accessing a new eNB, so that the old UE may receive two identical DCIs, and there is a problem of processing ambiguity, which results in that the old UE cannot correctly process the DCI. Therefore, in the embodiment of the present application, by making the old UE unable to interpret the PDCCH repeatedly transmitted when the PDCCH repeatedly transmitted is designed, the occurrence of the processing ambiguity problem can be avoided, and specifically, see the following fourth embodiment and fifth embodiment.

Example four

The following embodiments are used to describe the specific procedure of PDCCH detection in detail, and reference is first made to the PDCCH detection procedure shown in fig. 7, which includes:

step 701: the first UE accesses a broadcast dedicated carrier.

It should be noted that, the execution process of step 701 may refer to the detailed description of step 301 and step 302 in fig. 3, which is not described herein again.

Step 702: the network equipment adds a scrambling code sequence to coded bits corresponding to at least one third PDCCH candidate, wherein the third PDCCH candidate consists of (N/2) × L CCEs, L is an integer greater than or equal to 8, N is an even number greater than 0, and initialization parameters of a generator of the scrambling code sequence are

x may take the value {1,2,3, …,2}⁹-2，2 ⁹-1，2 ⁹Either one of, or

x may take the value {1,2,3, …,2}⁹-2，2 ⁹-1，2 ⁹One of y may take the value {1,2,3, …,2}⁹-2，2 ⁹-1，2 ⁹}.

The scrambled sequence can be represented as

Wherein

Is a bit sequence after scrambling, b (i) is a bit sequence before scrambling, c (i) is a scrambling sequence, wherein c (i) is a bit sequence according to initialization parameter c_initAnd (4) generating.

The coded bit corresponding to at least one third PDCCH candidate is a bit sequence before scrambling, and may also be understood as a bit sequence for generating the third PDCCH candidate.

For example, the network device adds the scrambling sequence to the coded bits corresponding to the at least one third PDCCH candidate before modulation, for example, before QPSK modulation, the network device accesses the scrambling sequence to the coded bits corresponding to the at least one third PDCCH candidate to obtain a scrambled bit sequence, and the scrambled bit sequence can be used to generate the third PDCCH candidate.

Step 703: the network equipment sends at least one first PDCCH candidate in the PDCCH candidate set to the first UE on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L CCEs, the starting positions of the code bit collection of the front (N/2) × L CCEs and the starting positions of the code bit collection of the rear (N/2) × L CCEs which respectively form the first PDCCH candidate are the same, L is an integer which is more than or equal to 8, and N is an even number which is more than 0.

Illustratively, in this step 703, the network device sends (at least one) first PDCCH consisting of (at least) one second PDCCH candidate and at least one third PDCCH candidate, where the second PDCCH candidate consists of (N/2) × L CCEs, L is an integer greater than or equal to 8, and N is an even number greater than 0.

The code bits corresponding to the at least one third PDCCH candidate added to the scrambling sequence before modulation (i.e. the bit sequence before scrambling) may be predefined by the network device and the first UE.

Illustratively, the network device and the first UE predefine first (N/2) × L CCEs for constituting the first PDCCH candidate to constitute the second PDCCH candidate and second (N/2) × L CCEs for constituting the third PDCCH candidate, or the network device and the first UE predefine first (N/2) × L CCEs for constituting the first PDCCH candidate to constitute the third PDCCH candidate and second (N/2) × L CCEs for constituting the second PDCCH candidate.

Optionally, the first UE may determine the at least one third PDCCH candidate for composing the first PDCCH candidate by receiving an MIB message, an SIB message, or an SI message sent by the network device.

For example, the first UE determines that the first (N/2) × L CCEs form the second PDCCH candidate and the last (N/2) × L CCEs form the third PDCCH candidate by receiving an MIB message or an SIB message or an SI message sent by the network device, or the first UE determines that the first (N/2) × L CCEs form the third PDCCH candidate and the last (N/2) × L CCEs form the second PDCCH candidate by receiving an MIB message or an SIB message or an SI message sent by the network device.

Optionally, the scrambling procedure for generating the third PDCCH candidate in this step 703 may be distinguished from existing scrambling techniques (e.g., the scrambling procedure for generating the second PDCCH candidate). For example, the procedure for generating the scrambling code sequence in step 703 may be different from the existing procedure for generating the scrambling code sequence (e.g. the initialization parameter c used in generating the third PDCCH candidate)_initDifferent from the initialization parameters used when generating the second PDCCH candidate), and/or the process of adding a scrambling sequence to the coded bits corresponding to at least one third PDCCH candidate may be different from the existing process of adding a scrambling sequence.

Step 704: the first UE descrambles the at least one third PDCCH candidate coded bit.

In particular toThe initialization parameter of the generator of the scrambling sequence is

x may take the value {1,2,3, …,2}⁹-2，2 ⁹-1，2 ⁹Either one of, or

Illustratively, the first UE descrambling the at least one third PDCCH candidate coded bit after demodulation, e.g. after QPSK modulation, the first UE descrambling the at least one third PDCCH candidate coded bit.

Optionally, since the descrambling process is the inverse process of the scrambling process, if the scrambling process in the above step 703 is different from the existing scrambling technology, the descrambling process in the step 704 is also different from the existing descrambling process.

Step 705: the first UE detects at least one first PDCCH candidate in the set of PDCCH candidates on the broadcast dedicated carrier.

In this step 705, except that the first PDCCH candidate is composed of a second PDCCH candidate and a third PDCCH candidate, which are different from those in the above step 303, the process of the first UE detecting the first PDCCH candidate in this step 705 may refer to the above step 303, and the similar points are not repeated herein, where in this step 705, the second PDCCH may be composed of front (N/2) × L CCEs, the third PDCCH candidate may be composed of rear (N/2) × L CCEs, or the third PDCCH candidate may be composed of front (N/2) × L CCEs, and the second PDCCH may be composed of rear (N/2) × L CCEs.

Optionally, the sequence of the step 704 and the step 705 executed by the first UE may not be limited, the first UE may execute the step 704 first and then execute the step 705, or the first UE may execute the step 705 first and then execute the step 704.

Therefore, for the old UE, when the aggregation level of the PDCCH is greater than or equal to the aggregation level of the old UE, the old UE cannot detect the PDCCH sent by the network device, and the PDCCH repeatedly sent is not read, so that the problem of processing ambiguity is avoided.

EXAMPLE five

The following embodiments are used to describe the specific procedure of PDCCH detection in detail, and reference is first made to the PDCCH detection procedure shown in fig. 8, which includes:

step 801: the first UE accesses a broadcast dedicated carrier.

It should be noted that, the execution process of step 801 may refer to the detailed description of step 301 and step 302 in fig. 3, and is not described herein again.

Step 802: and the network equipment interweaves symbols corresponding to at least one third PDCCH candidate according to four symbols as a unit to obtain at least one third PDCCH candidate, wherein the third PDCCH candidate consists of (N/2) × L CCEs, L is an integer greater than or equal to 8, and N is an even number greater than 0.

Wherein the symbol corresponding to the at least one third PDCCH candidate may be understood as the symbol used for generating the third PDCCH candidate.

For example, the Symbol is in units of four symbols, and may be a Symbol Quadruplet (Symbol Quadruplet) mapped to one resource Element group reg (resource Element group).

In particular, use is made of z^(p)(i)＝<y ^(p)(4i),y ^(p)(4i+1),y ^(p)(4i+2),y ^(p)(4i+3)>Representing a symbol quadruple numbered i and an antenna port numbered p, the symbol quadruple chunk corresponding to the third PDCCH candidate being represented as z^(p)(0),…,z ^(p)(M _quad-1), the interleaved symbol quad-block is denoted w^(p)(0),…,w ^(p)(M _quad-1) wherein M_quad＝M _symb/4，M _symbIs the number of symbols, M, included in the third PDCCH candidate_quadIs the number of symbol quadruples comprised by the third PDCCH candidate.

Specifically, a rank interleaver is used to interleave the symbol quadruple corresponding to the third PDCCH candidate, and the specific steps are as follows:

1)

is the number of the columns of the matrix of the row-column interleaver, and the columns of the matrix are respectively numbered from left to right as

2) Selecting a satisfying formula

And the smallest integer

Determining the number of rows in the matrix, where D is M_quadThe number of symbol quadruples corresponding to the third PDCCH candidate is as follows, and the rows of the matrix are respectively numbered from top to bottom

3) If it is not

Then

The filled virtual symbol quadruple is y_k＝<NULL>Where k is 0,1, …, N_D–1，

Where k is 0,1, …, D-1, sequence y of symbols quadruple_kWrite dimension row by row of

And the initial symbol quadruple of 0 row and 0 column is y₀The matrix after writing is:

4) based on the mode shown in Table 26 or Table 27

Performing an inter-column permutation on the above matrix, wherein P (j) is the number of the original column corresponding to the permuted column with number j, and the inter-column permuted matrix

Comprises the following steps:

5) the output of the interleaver is a permutation matrix from among the columns

Reading the initial symbol quadruple sequence in a row-by-row manner, wherein the interleaved symbol quadruple is

Wherein

Corresponds to y_P(0)，

Correspond to

And is

Wherein K_ΠIs the number of elements in the interleaver matrix.

6) Removing symbol quadruple sequences

In (1)<NULL>Element, interleaved symbol quadruple sequence denoted w^(p)(0),…,w ^(p)(M _quad-1)。

The order of the interleaving step 5) and the interleaving step 6) may be variable, and is not limited, for example, the network device may perform step 5) first and then perform step 6), or perform step 6) first and then perform step 5).

Optionally, the network device permutes the matrix from among the columns when performing the interleaving step 5)

When reading the initial symbol quadruple sequence in a column-by-column manner, skip<NULL>Element, output symbol quadruple sequence represented as w^(p)(0),…,w ^(p)(M _quad-1), and step 6) is not performed anymore.

Tables 26 and 27 show the permutation patterns between columns of the interleaver.

Number of columns in Table 26 is the Number of original column, used

Indicating that Inter-column permation pattern is an Inter-column permutation pattern,

respectively correspond to<1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30>When is coming into contact with

In the case of 32, the inter-column permutation pattern is that P (31) is 1, P (30) is 17, P (29) is 9, P (28) is 25, P (27) is 5, P (26) is 21, P (25) is 13, P (24) is 29, P (23) is 3, P (22) is 19, P (21) is 11, P (20) is 27, P (19) is 7, P (18) is 23, P (17) is 15, P (16) 31, P (15) is 0, P (14) is 16, P (13) is 8, P (12) is 24, P (11) is 4, P (10) is 20, P (9) is 12, P (8) 28, P (7) is 2, P (6) is 4, P (10) is 1, P (6) is 1, P (3) is 1, P (22) is 1, P (6) is 3, P (14).

Watch 26

Number of columns in Table 27 is the Number of original columns used for

Indicating that Inter-column permation pattern is an Inter-column permutation pattern satisfying the requirement

When in use

In the case of 32, the inter-column permutation pattern is that P (0) is 30, P (1) is 14, P (2) is 22, P (3) is 6, P (4) is 26, P (5) is 10, P (6) is 18, P (7) is 2, P (8) is 28, P (9) is 12, P (10) is 20, P (11) is 4, P (12) is 24, P (13) is 8, P (14) is 16, P (15) is 0, P (16) is 31, P (17) is 15, P (18) is 23, P (19) is 7, P (20) is 27, P (21) is 11, P (22) is 19, P (23) is 3, P (24) is 29, P (25) is 13, P (21) is 27, P (21) is 11, P (22) is 19, P (23) is 3, P (24) is 29, P (25) is 29, P (9) is 30, P (9) is 1, P (9) and P (9).

Watch 27

At formation of z^(p)(0),…,z ^(p)(M _quad-1) of the symbol quadruples output by the interleaver<NULL>The element may be removed.

Wherein the symbol quadruple output by the interleaver may be used to generate a third PDCCH candidate.

For example, the network device interleaves symbols corresponding to the at least one third PDCCH candidate in units of four symbols after layer mapping and precoding and/or before mapping to the physical resource REG.

Step 803: the network equipment sends at least one first PDCCH candidate in the PDCCH candidate set to the first UE on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L CCEs, the starting positions of the code bit collection of the front (N/2) × L CCEs and the starting positions of the code bit collection of the rear (N/2) × L CCEs which respectively form the first PDCCH candidate are the same, L is an integer which is more than or equal to 8, and N is an even number which is more than 0.

Illustratively, in this step 803, the network device sends the (at least one) first PDCCH consisting of (at least) one second PDCCH candidate and at least one said third PDCCH candidate, said second PDCCH candidate consisting of (N/2) × L CCEs, L being an integer greater than or equal to 8, N being an even number greater than 0.

The symbol corresponding to the at least one third PDCCH candidate interleaved before modulation may be predefined by the network device and the first UE.

Optionally, the interleaving process in this step 703 may be distinguished from existing interleaving techniques (including an interleaving process that generates the second PDCCH candidate). For example, the process of performing the inter-column permutation on the matrix in step 3) based on the pattern shown in table 26 or table 27 is different from the existing process.

Step 804: the symbols included by the first UE for the at least one third PDCCH candidate are deinterleaved in units of four symbols.

For example, the symbols are mapped to one resource element group REG in units of four symbols, which may be symbol quadruples.

Specifically, the first UE deinterleaves the symbol quadruple of the third PDCCH, specifically including the following steps:

steps (1) and (2) see steps 1) and 2) in step 802 to determine the number of rows and columns of the deinterleaver matrix.

(3) The position of the < NULL > element in the deinterleaver initial matrix (corresponding to the permutator between interleaver column) is determined according to steps 3) and 4) in step 802 and the < NULL > element is written into the corresponding position of the deinterleaver initial matrix.

(4) The symbol quadruples are written into the deinterleaver initial matrix sequentially from left to right (left and right in symbol quadruple arrangement) column by column, and the positions in the deinterleaver initial matrix where the < NULL > elements have been written are skipped until the deinterleaver initial matrix is filled.

(5) Inversely permutating the deinterleaver initial matrix according to the inter-column permutation pattern shown in table 26 or table 27 used in step 4) in step 802, and determining an inter-column permutation matrix (corresponding to the interleaver initial matrix) of the deinterleaver.

(6) Reading symbol quadruples from top to bottom (top and bottom when arranging the permutation matrixes among the columns) in sequence from row to row in the permutation matrix among the columns of the de-interleaver, and skipping < NULL > elements in the permutation matrix among the columns of the de-interleaver to determine a sequence of the de-interleaved symbol quadruples.

For example, the symbols included by the first UE for the at least one third PDCCH candidate are deinterleaved in units of four symbols after resource inverse mapping and/or before layer mapping and de-precoding.

Optionally, since the deinterleaving process is the inverse process of the interleaving process, if the interleaving process in the step 803 is different from the existing scrambling technique, the deinterleaving process in the step 804 is also different from the existing deinterleaving process.

Step 805: the first UE detects at least one first PDCCH candidate in the set of PDCCH candidates on the broadcast dedicated carrier.

In this step 805, except that the first PDCCH candidate is composed of a second PDCCH candidate and a third PDCCH candidate, which are different from those in step 303 described above, the process of the first UE detecting the first PDCCH candidate in step 805 may refer to step 303 described above, and the similar points are not repeated herein, where in step 805, the second PDCCH may be composed of front (N/2) × L CCEs, the third PDCCH candidate may be composed of rear (N/2) × L CCEs, or the third PDCCH candidate may be composed of front (N/2) × L CCEs, and the second PDCCH may be composed of rear (N/2) × L CCEs.

Optionally, the order in which the first UE performs step 804 and step 805 may not be limited, and the first UE may perform step 804 first and then step 805, or the first UE may perform step 805 first and then step 804.

The PDCCH detection method according to the embodiment of the present invention is described in detail with reference to fig. 3 to fig. 8, and based on the same inventive concept as that of the PDCCH detection method, the embodiment of the present invention further provides a PDCCH detection apparatus, as shown in fig. 9, where the PDCCH detection apparatus 900 includes a processing unit 901 and a transceiver unit 902, and the apparatus 900 may be configured to implement the method described in the above method embodiment applied to a UE or a network device, where the UE includes a first UE and/or a second UE, and the first UE is mainly described herein.

In one embodiment, apparatus 900 is applied to a first UE.

Specifically, the processing unit 901 is configured to access a broadcast dedicated carrier;

a transceiving unit 902, configured to receive at least one first PDCCH candidate in a PDCCH candidate set on the broadcast dedicated carrier, where the first PDCCH candidate is composed of N × L CCEs, where in the N × L CCEs, starting positions of coded bit collection of first (N/2) × L CCEs and last (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0;

the processing unit 901 is further configured to detect the at least one first PDCCH candidate.

In one implementation, the first PDCCH candidate consists of N × L consecutive CCEs starting with a first starting CCE, which is CCE index 0.

In one implementation, the first (N/2) × L CCEs, and the second (N/2) × L CCEs constitute two second PDCCH candidates, respectively.

In one implementation, the first (N/2) × L CCEs constitute a second PDCCH candidate, and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or

In one implementation, the first PDCCH candidate is in a common search space.

In an implementation manner, the processing unit 901 is specifically configured to, if a first UE receives an indication sent by a network device to detect the first PDCCH candidate, detect at least one first PDCCH candidate in the PDCCH candidate set by the first UE; or if the first UE supports the detection of the first PDCCH candidate, the first UE detects at least one first PDCCH candidate in the PDCCH candidate set.

In one implementation, the indication to detect the first PDCCH candidate is indicated by an MBMS master information block carried by a physical broadcast channel, PBCH.

In another embodiment, the apparatus 900 is applied to a network device.

Specifically, the transceiver 902 is configured to send a signal for a UE to access to the UE on a broadcast dedicated carrier;

a processing unit 901, configured to determine at least one PDCCH candidate in a PDCCH candidate set, where the first PDCCH candidate is composed of N × L CCEs, where the start positions of coded bit collection of the first (N/2) × L CCEs and the last (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0;

the transceiving unit 902 is further configured to transmit the at least one first PDCCH candidate to the UE on the broadcast dedicated carrier.

In one implementation, the first PDCCH candidate is in a common search space.

In an implementation, the transceiver unit 902 is further configured to send, to the first UE, an indication to detect the first PDCCH candidate.

In one implementation, the indication to detect the first PDCCH candidate is at least one information in an MBMS master information block carried by a physical broadcast channel, PBCH.

It should be noted that, the division of the modules in the embodiments of the present application is schematic, and is only a logical function division, and in actual implementation, there may be another division manner, and in addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or may exist alone physically, or two or more units are integrated in one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Based on the same concept as the PDCCH detection method, as shown in fig. 10, an embodiment of the present application further provides a schematic structural diagram of a PDCCH detection apparatus 1000. The apparatus 1000 may be configured to implement the method described in the method embodiment of the UE or the network device, which may be referred to as the description in the method embodiment. The UE comprises a first UE and/or a second UE. The apparatus 1000 may be in or be a UE or a network device.

The apparatus 1000 includes one or more processors 1001. The processor 1001 may be a general-purpose processor or a special-purpose processor, etc. For example, a baseband processor, or a central processor. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control a communication device (e.g., a base station, a terminal, or a chip), execute a software program, and process data of the software program. The communication device may include a transceiving unit to enable input (reception) and output (transmission) of signals. For example, the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The apparatus 1000 includes one or more processors 1001, and the one or more processors 1001 may implement the method of the UE or the network device in the above illustrated embodiments.

Alternatively, the processor 1001 may also implement other functions than the method of the above-described illustrated embodiment.

Alternatively, in one design, the processor 1001 may execute instructions to enable the apparatus 1000 to perform the method described in the above method embodiment. The instructions may be stored in whole or in part in the processor, such as instructions 1003, or in whole or in part in a memory 1002 coupled to the processor, such as instructions 1004, or may collectively cause apparatus 1000 to perform the methods described in the above method embodiments, through

instructions

1003 and 1004.

In yet another possible design, the communications apparatus 1000 may also include circuitry that may implement the functionality of the UE or the network device in the foregoing method embodiments.

In yet another possible design, the apparatus 1000 may include one or more memories 1002 having instructions 1004 stored thereon, which are executable on the processor, so that the apparatus 1000 performs the methods described in the above method embodiments. Optionally, the memory may further store data therein. Instructions and/or data may also be stored in the optional processor. For example, the one or more memories 1002 may store the corresponding relationships described in the above embodiments, or related parameters or tables and the like involved in the above embodiments. The processor and the memory may be provided separately or may be integrated together.

In yet another possible design, the apparatus 1000 may also include a transceiver 1005 and an antenna 1006. The processor 1001 may be referred to as a processing unit and controls a device (terminal or base station). The transceiver 1005 may be referred to as a transceiver, a transceiving circuit, a transceiver, or the like, and is used for performing transceiving functions of the apparatus through the antenna 1006.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

An embodiment of the present application further provides a computer-readable medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the method for detecting a PDCCH described in any of the method embodiments applied to a UE or a network device.

An embodiment of the present application further provides a computer program product, and when executed by a computer, the computer program product implements the method for detecting a PDCCH described in any of the method embodiments applied to the UE or the network device.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method for detecting the PDCCH according to any of the method embodiments applied to the UE or the network device.

It should be understood that the processing device may be a chip, the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated in the processor, located external to the processor, or stand-alone.

The CFI configuration method according to the embodiment of the present invention is described in detail above with reference to fig. 4 to fig. 5, and based on the same inventive concept as the CFI configuration method, the embodiment of the present invention further provides a CFI configuration apparatus, as shown in fig. 11, where the CFI configuration apparatus 1100 includes a processing unit 1101 and a transceiver unit 1102, and the apparatus 1100 may be used to implement the method described in the above method embodiment applied to a UE or a network device, where the UE includes a first UE and/or a second UE, and the first UE is mainly described herein.

In one embodiment, the apparatus 1100 is applied to a UE.

Specifically, the processing unit 1101 is configured to determine a CFI, where the CFI is used to indicate a number of symbols occupied by PDCCH transmission in one subframe, and the CFI is determined in at least one of the following manners:

the UE determines the CFI according to the received third information;

the UE determines the CFI according to a predefined definition;

and the UE determines the CFI according to the first corresponding relation and the fourth information.

A transceiving unit 1102 configured to receive downlink control information PDCCH;

the processing unit is further configured to detect the PDCCH according to the CFI.

In one implementation, the third information and/or the fourth information is carried in an MBMS master information block.

In one implementation, the third information indicates the value of the CFI by 1 bit, including one of: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In one implementation, the third information indicates the value of the CFI by 1 bit, the value 0 indicates that the value of the CFI is indicated without using the third information, and the value of the CFI indicated by the value 1 includes one of the following cases: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In one implementation, the third information indicates the value of the CFI by 1 bit, a value of 1 indicates that the value of the CFI is indicated without using the third information, and a value of 0 indicates the value of the CFI, including one of the following cases: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In one implementation, the third information indicates the value of the CFI by 2 bits, including one of: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In one implementation, the third information indicates the value of the CFI by 2 bits, including one of: 1,2 and 3; or 2,3 and 4; or 1,2 and 4; or 1,3 and 4; or 1,2,3 and 4.

In one implementation, the third information indicates the value of the CFI by 2 bits, the value 00 indicates the value of the CFI without using the third information, and one of the

values

01,10, and 11 indicates the value of the CFI, including one of the following cases: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In one implementation, the third information indicates the value of the CFI by 2 bits, the value 11 represents the value of the CFI indicated without using the third information, and one of the values 00,01, and 10 indicates the value of the CFI, including one of the following cases: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In one implementation, the processing unit is specifically configured to determine a value of the CFI according to a predefined definition, where the CFI value includes one of 1,2,3, and 4.

In one implementation, the UE determines the value of the CFI according to sixth information and predefined, where the sixth information includes 1 bit; a value of 0 indicates a value of CFI that is not determined using a predefined definition, and a value of 1 indicates a value of the CFI, including one of: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4; or a value of 1 represents a value indicating that the CFI is not determined using the predefined definition and a value of 0 represents a value of the CFI, including one of the following cases: 1,2 and 3; or one of 2,3 and 4; or one of 1,2 and 4; or one of 1,3 and 4; or one of 1,2,3 and 4.

In an implementation, the processing unit is specifically configured to determine the CFI according to the first corresponding relationship and fourth information, where the fourth information is used to indicate a system bandwidth or a number of resource blocks, RBs; the first corresponding relation comprises the corresponding relation between the numerical value of the system bandwidth and the numerical value of the CFI, or the corresponding relation between the number of RBs and the numerical value of the CFI.

In one implementation, the UE determines the CFI according to fifth information, the first corresponding relationship and fourth information, where the fifth information includes 1 bit; a value of 0 indicates a value of CFI determined without using the first correspondence and the fourth information, and a value of 1 indicates a value of CFI determined using the first correspondence and the fourth information; or the value 1 indicates that the CFI value is determined without using the first correspondence relationship and the fourth information, and the value 0 determines the CFI value using the first correspondence relationship and the fourth information.

In one implementation, the first corresponding relationship includes a corresponding relationship between a system bandwidth value and a CFI value, or a corresponding relationship between a number of RBs and a CFI value, and includes:

In another embodiment, the apparatus 1100 is applied to a network device.

Specifically, the processing unit 1101 is configured to determine a third message and/or a fourth message, where the third message and the fourth message are used to indicate a CFI, and the CFI is used to indicate a number of symbols occupied by PDCCH transmission in one subframe;

a transceiving unit 1102, configured to send a third message and/or a fourth message to the user equipment UE, where the third message and/or the fourth message are information carried in a physical broadcast channel PBCH.

values

In one implementation, the fourth information is used to indicate a system bandwidth or a number of resource blocks, RBs.

Based on the same concept as the CFI configuration method, as shown in fig. 12, the embodiment of the present application further provides a schematic structural diagram of a CFI configuration apparatus 1200. The apparatus 1200 may be configured to implement the method described in the method embodiment of the UE or the network device, which may be referred to as the description in the method embodiment. The UE comprises a first UE and/or a second UE. The apparatus 1200 may be in or be a UE or a network device.

The apparatus 1200 includes one or more processors 1201. The processor 1201 may be a general purpose processor, a special purpose processor, or the like. For example, a baseband processor, or a central processor. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control a communication device (e.g., a base station, a terminal, or a chip), execute a software program, and process data of the software program. The communication device may include a transceiving unit to enable input (reception) and output (transmission) of signals. For example, the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The apparatus 1200 includes one or more processors 1201, and the one or more processors 1201 may implement the method of the UE or the network device in the illustrated embodiment described above.

Optionally, the processor 1201 may also implement other functions in addition to implementing the methods of the illustrated embodiments described above.

Alternatively, in one design, the processor 1201 may execute instructions to cause the apparatus 1200 to perform the methods described in the above method embodiments. The instructions may be stored in whole or in part in the processor, such as instructions 1203, or in whole or in part in a memory 1202 coupled to the processor, such as instructions 1204, or may collectively cause the apparatus 1200 to perform the methods described in the above method embodiments, through

instructions

1203 and 1204.

In yet another possible design, the communications apparatus 1200 may also include circuitry that may implement the functionality of the UE or the network device in the foregoing method embodiments.

In yet another possible design, the apparatus 1200 may include one or more memories 1202 having instructions 1204 stored thereon, which are executable on the processor, such that the apparatus 1200 performs the methods described in the above method embodiments. Optionally, the memory may further store data therein. Instructions and/or data may also be stored in the optional processor. For example, the one or more memories 1202 may store the corresponding relationships described in the above embodiments, or related parameters or tables and the like involved in the above embodiments. The processor and the memory may be provided separately or may be integrated together.

In yet another possible design, the apparatus 1200 may also include a transceiver 1205 and an antenna 1206. The processor 1201 may be referred to as a processing unit and controls a device (terminal or base station). The transceiver 1205 may be referred to as a transceiver, a transceiving circuit, a transceiver, or the like, and is used for performing transceiving functions of the apparatus through the antenna 1206.

The present application further provides a computer-readable medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the method for configuring the CFI described above in any method embodiment applied to a UE or a network device.

The present application further provides a computer program product, which when executed by a computer, implements the method for configuring a CFI described in any of the method embodiments applied to a UE or a network device.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method for configuring the CFI according to any one of the method embodiments applied to the UE or the network device.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented in hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, the method is simple. Any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a Digital Subscriber Line (DSL), or a wireless technology such as infrared, radio, and microwave, the coaxial cable, the fiber optic cable, the twisted pair, the DSL, or the wireless technology such as infrared, radio, and microwave are included in the fixation of the medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy Disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

In short, the above description is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

A method for detecting a Physical Downlink Control Channel (PDCCH) is characterized by comprising the following steps:

a first user terminal UE accesses a broadcast special carrier;

the first UE detects at least one first PDCCH candidate in the PDCCH candidate set on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L Control Channel Elements (CCEs), the starting positions of the coded bit collection of the first (N/2) × L CCEs and the second (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.
The method of claim 1, wherein the first PDCCH candidate consists of N x L consecutive CCEs starting from a first starting CCE, which is CCE index 0.
The method according to claim 1 or 2, wherein the first (N/2) × L CCEs, and the second (N/2) × L CCEs constitute two second PDCCH candidates, respectively.
The method of claim 1 or 2, wherein the first (N/2) × L CCEs constitute a second PDCCH candidate and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or

The first (N/2) L CCEs constitute a third PDCCH candidate, and the last (N/2) L CCEs constitute a second PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently from the second PDCCH candidate.
The method of any of claims 1-4, wherein the first PDCCH candidate is in a common search space.
The method according to any of claims 1-5, wherein the detecting at least one first PDCCH candidate in the PDCCH candidate set comprises:

if the first UE receives an indication sent by network equipment for detecting the first PDCCH candidate, the first UE detects at least one first PDCCH candidate in the PDCCH candidate set; or

And if the first UE supports the detection of the first PDCCH candidate, the first UE detects at least one first PDCCH candidate in the PDCCH candidate set.
The method of claim 6, wherein the indication to detect the first PDCCH candidate is indicated by an MBMS Master information Block carried by a Physical Broadcast Channel (PBCH).
A method for detecting a Physical Downlink Control Channel (PDCCH) is characterized by comprising the following steps:

the method comprises the steps that network equipment sends a signal for UE to access to a user equipment UE on a broadcast special carrier;

the network equipment sends at least one first PDCCH candidate in the PDCCH candidate set to the UE on the broadcast dedicated carrier, wherein the first PDCCH candidate is composed of N × L Control Channel Elements (CCEs), the starting positions of the coded bit collection of the first (N/2) × L CCEs and the second (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0.
The method of claim 8, wherein the first PDCCH candidate consists of N x L consecutive CCEs starting from a first starting CCE, which is CCE index 0.
The method according to claim 8 or 9, wherein the first (N/2) × L CCEs, and the second (N/2) × L CCEs constitute two second PDCCH candidates, respectively.
The method of claim 8 or 9, wherein the first (N/2) × L CCEs constitute a second PDCCH candidate and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or

The first (N/2) L CCEs constitute a third PDCCH candidate, and the last (N/2) L CCEs constitute a second PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently from the second PDCCH candidate.
The method of any of claims 8-11, wherein the first PDCCH candidate is in a common search space.
The method according to any one of claims 8-12, further comprising:

the network device sends an indication to the first UE to detect a first PDCCH candidate.
The method of any of claims 8-13, wherein the indication to detect the first PDCCH candidate is at least one information in an MBMS master information block carried by a physical broadcast channel, PBCH.
A detection device for a Physical Downlink Control Channel (PDCCH), comprising:

a processing unit, configured to access a broadcast dedicated carrier;

a transceiving unit, configured to receive at least one first PDCCH candidate in a PDCCH candidate set on the broadcast dedicated carrier, where the first PDCCH candidate is composed of N × L CCEs, where in the N × L CCEs, starting positions of coded bit collection of first (N/2) × L CCEs and last (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0;

the processing unit is further configured to detect the at least one first PDCCH candidate.
The apparatus of claim 15, wherein the first PDCCH candidate consists of N x L consecutive CCEs starting with a first starting CCE, and wherein the first starting CCE is CCE index 0.
The apparatus according to claim 15 or 16, wherein the first (N/2) × L CCEs, and the second (N/2) × L CCEs constitute two second PDCCH candidates, respectively.
The apparatus of claim 15 or 16, wherein the first (N/2) × L CCEs constitute a second PDCCH candidate and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or

The first (N/2) L CCEs constitute a third PDCCH candidate, and the last (N/2) L CCEs constitute a second PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently from the second PDCCH candidate.
The apparatus of any of claims 15-18, wherein the first PDCCH candidate is in a common search space.
The apparatus according to any of claims 15-19, wherein the processing unit is specifically configured to, if a first UE receives an indication sent by a network device to detect the first PDCCH candidate, detect at least one first PDCCH candidate in the PDCCH candidate set by the first UE; or if the first UE supports the detection of the first PDCCH candidate, the first UE detects at least one first PDCCH candidate in the PDCCH candidate set.
The apparatus of claim 20, wherein the indication to detect the first PDCCH candidate is indicated by an MBMS master information block carried by a physical broadcast channel, PBCH.
A detection device for a Physical Downlink Control Channel (PDCCH), comprising:

a receiving and sending unit, configured to send a signal for a user equipment UE to access to on a broadcast dedicated carrier;

a processing unit, configured to determine at least one PDCCH candidate in a PDCCH candidate set, where the first PDCCH candidate is composed of N × L CCEs, where the start positions of coded bit collection of the first (N/2) × L CCEs and the last (N/2) × L CCEs are the same, L is an integer greater than or equal to 8, and N is an even number greater than 0;

the transceiver unit is further configured to transmit the at least one first PDCCH candidate to the UE on the broadcast dedicated carrier.
The apparatus of claim 22, wherein the first PDCCH candidate consists of N x L consecutive CCEs starting with a first starting CCE, and wherein the first starting CCE is CCE index 0.
The apparatus of claim 22 or 23, wherein the first (N/2) × L CCEs, and the second (N/2) × L CCEs constitute two second PDCCH candidates, respectively.
The apparatus of claim 22 or 23, wherein the first (N/2) × L CCEs constitute a second PDCCH candidate and the last (N/2) × L CCEs constitute a third PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently than the second PDCCH candidate; or

The first (N/2) L CCEs constitute a third PDCCH candidate, and the last (N/2) L CCEs constitute a second PDCCH candidate, wherein the third PDCCH candidate is scrambled and/or interleaved differently from the second PDCCH candidate.
The apparatus of any of claims 22-25, wherein the first PDCCH candidate is in a common search space.
The apparatus of any of claims 22-26, wherein the transceiver component is further configured to send an indication to the first UE to detect the first PDCCH candidate.
The apparatus of any of claims 22-27, wherein the indication to detect the first PDCCH candidate is at least one information in an MBMS master information block carried by a physical broadcast channel, PBCH.
The detection device of the physical downlink control channel PDCCH is characterized by comprising a processor and a memory, wherein the processor is coupled with the memory;

a memory for storing a computer program;

a processor for executing a computer program stored in the memory to cause the apparatus to perform the method of any of claims 1-12.
A computer-readable storage medium comprising a program or instructions for performing the method of any of claims 1-14 when the program or instructions are run on a computer.
A computer program product comprising a program or instructions for performing the method of any one of claims 1-14 when the program or instructions are run on a computer.
A chip coupled to a memory for reading and executing program instructions stored in the memory to perform the method of any of claims 1-14.