CN115515242A

CN115515242A - Search space configuration method, physical downlink control channel search method and device

Info

Publication number: CN115515242A
Application number: CN202211154220.0A
Authority: CN
Inventors: 许晓航; 胡春雷; 于金杨; 李皛; 魏明烁
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-12-23

Abstract

The disclosure provides a search space configuration method, a physical downlink control channel search method and a physical downlink control channel search device, and belongs to the technical field of communication. When the device capability information of the user equipment is compatible with the corresponding device type, acquiring a preset time-frequency domain in a first symbol, namely an initial time-frequency domain preset for incompatible user equipment in an OFDM symbol which is not configured with an LTE CRS; presetting CCE (control channel element) in the OFDM (orthogonal frequency division multiplexing) symbol and the first symbol for configuring the LTE CRS (Long term evolution reference signal); and configuring a combined search space of the first symbol and the second symbol and indicating a preset time-frequency domain to the user equipment through RRC signaling so that the user equipment searches the PDCCH outside the preset time-frequency domain in the combined search space. The combined search space in the scheme can support sufficient CCE with aggregation level required, resources are fully utilized, cell capacity and coverage rate are improved, invalid search of compatible user equipment in a preset time frequency domain is avoided, energy consumption is reduced, search time is shortened, and efficiency is improved.

Description

Search space configuration method, physical downlink control channel search method and device

Technical Field

The disclosure belongs to the technical field of communication, and particularly relates to a search space configuration method, a physical downlink control channel search method and a device.

Background

The Dynamic Spectrum Sharing (DSS) technology dynamically allocates the same Spectrum resource between two network systems, namely 4G LTE and 5G NR, to meet the actual service requirements. The DSS is mainly based on a flexible implementation of 5G NR, with dynamic 5G NR adaptation to static 4G LTE, scheduling of 5G NR in 4G LTE subframes to avoid signal collision. Specifically, a Control Resource Set (CORESET) encapsulates Frequency band information occupied by a Physical Downlink Control Channel (NR PDCCH) in a Frequency domain and an Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by a time domain, and a Search Space (Search Space) encapsulates a starting OFDM symbol of the NR PDCCH in the time domain, and for the NR PDCCH, a time-Frequency position where the NR PDCCH is located in the Frequency domain may be determined in the time domain, so as to implement configuration of the NR PDCCH.

In an LTE subframe, an NR PDCCH may be allocated in an OFDM symbol where an LTE CRS (Cell Reference Signal) is located. Fig. 1 is a schematic configuration diagram of an NR PDCCH in a DSS scenario provided by the embodiment of the present disclosure, and as shown in fig. 1, when an OFDM symbol where an LTE CRS is located is symbol 1, the NR PDCCH may be configured at symbol 1 and symbol 2. However, the NR PDCCH DMRS at position 101 in fig. 1 collides with the LTE CRS on symbol 1, and therefore this scheme requires that the terminal be equipped with a collision and interference avoidance function, which imposes a high requirement on the performance of the terminal device.

In the above scheme, in order to consider the performance of different terminals and the CSS (common search space) configuration of the collision-avoidance and interference-avoidance terminal before accessing the LTE subframe, a position of a time-frequency domain needs to be reserved on symbol 2 for the collision-avoidance and interference-avoidance terminal, so as to implement normal access of the collision-avoidance and interference-avoidance terminal. At this time, at the time of access of the evasive terminal, only the search space of symbol 1 and the search space remaining on symbol 2 can be independently allocated to the evasive terminal, respectively, resulting in the search spaces of symbol 1 and symbol 2 being divided into two. Fig. 2 is a schematic diagram of a search space configuration in the related art according to an embodiment of the disclosure, and fig. 3 is a schematic diagram of a search space configuration in the related art according to an embodiment of the disclosure. As shown in fig. 2, outside the reserved time-frequency domain 201, a search space 202 and a search space 203 which are independent from each other are allocated to the evasive terminal, CCE 1 to CCE N are mapped in the search space 202, and CCE 1 to CCE M are mapped in the search space 203; alternatively, as shown in fig. 3, outside the reserved time-frequency domain 301, a search space 302 and a search space 303 that are independent of each other are allocated to the evasive terminal, CCEs 1 to CCE N are mapped in the search space 302, and CCEs 1 to CCE M are mapped in the search space 303.

On this basis, a sufficient number of CCEs (Control Channel elements) meeting the aggregation level requirement may not be allocated to the divided search space, which affects the capacity and coverage of the 5G cell, and even a CCE meeting the aggregation level requirement may not be allocated due to a small search space, which may result in that the search space is unusable and wastes network resources; and if the search spaces of the symbol 1 and the symbol 2 are combined and allocated to the avoidable terminal, the invalid search time reserved for the time-frequency domain of the unobtainable terminal is searched, the energy consumption of the avoidable terminal is increased, and the search efficiency is influenced.

Disclosure of Invention

The disclosed embodiments provide a search space configuration method, a physical downlink control channel search method and a physical downlink control channel search device, which can solve the problems of low cell capacity and coverage, low resource utilization rate, high energy consumption for user equipment search traversal, and low search efficiency caused by the compatibility of user equipment with different performances when a search space is allocated to a user.

In order to solve the technical problem, the present disclosure is implemented as follows:

in a first aspect, the present disclosure provides a search space configuration method, which is applied to an NR base station, and may include receiving device capability information reported by a user equipment; determining the equipment type of the user equipment according to the equipment capability information; acquiring a preset time-frequency domain in a first symbol under the condition that the equipment types are compatible, wherein the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with an LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for user equipment with the equipment types being incompatible in a search space of the first symbol; carrying out control channel unit mapping in a search space of a second symbol and a search space outside a preset time-frequency domain in the first symbol, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; and sending a radio resource control signaling to the user equipment, configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment based on the infinite resource control signaling, and indicating the preset time-frequency domain in the radio resource control signaling so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space.

Optionally, the mapping of the control channel unit is performed outside a preset time-frequency domain in the second symbol and the first symbol, and includes: in the search space of the second symbol, obtaining a first control channel unit based on a mapping mode of a frequency domain, wherein the number of the first control channel units is determined according to a preset time-frequency domain; and obtaining a second control channel unit based on a mapping mode of a time domain and a frequency domain in a preset search space outside a time-frequency domain in the first symbol and a search space outside a first control channel unit of the second symbol.

Optionally, after determining the device type of the user equipment according to the device capability information, the method further includes: and under the condition that the equipment types are incompatible, configuring a search space of a first symbol for the user equipment so that the user equipment searches the physical downlink control channel in a preset time-frequency domain in the first symbol.

Optionally, determining the device type of the user equipment according to the device capability information includes: determining that the equipment type of the user equipment is compatible under the condition that the user equipment is determined to have the function of processing signal collision according to the equipment capability information; and under the condition that the user equipment is determined not to have the function of processing the signal conflict according to the equipment capability information, determining that the equipment type of the user equipment is incompatible.

Optionally, the mapping includes any one of an interleaved mapping and a non-interleaved mapping.

In a second aspect, the present disclosure also provides a method for searching a physical downlink control channel, where the method is applied to a user equipment, and a device type of the user equipment is compatible, and the method may include: reporting the equipment capability information to an NR base station; receiving a radio resource control signaling sent by an NR base station, wherein the radio resource control signaling is used for allocating a combined search space of a first symbol and a second symbol and indicating a preset time-frequency domain, the preset time-frequency domain is an initial time-frequency domain preset for user equipment with incompatible equipment types in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with LTE cell reference signals; and searching a physical downlink control channel outside a preset time-frequency domain in a combined search space of a first symbol and a second symbol distributed by the NR base station, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

In a third aspect, the present disclosure provides a search space configuration apparatus, which is applied to an NR base station, and may include: a report receiving module, configured to receive device capability information reported by a user equipment; the equipment determining module is used for determining the equipment type of the user equipment according to the equipment capability information; the device comprises a preset time-frequency domain determining module, a preset time-frequency domain determining module and a preset time-frequency domain determining module, wherein the preset time-frequency domain determining module is used for acquiring a preset time-frequency domain in a first symbol under the condition that the device type is compatible, the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with an LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for user equipment with the incompatible device type in a search space of the first symbol; the control channel unit mapping module is used for mapping the control channel unit in a search space of a second symbol and a search space outside a preset time-frequency domain in the first symbol, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; and the search space configuration module is used for sending a wireless resource control signaling to the user equipment, configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment based on the infinite resource control signaling, and indicating the preset time-frequency domain in the wireless resource control signaling so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space.

Optionally, the control channel unit mapping module is specifically configured to obtain, in a search space of the second symbol, a first control channel unit based on a frequency domain mapping manner, where the number of the first control information units is determined according to a preset time-frequency domain; and in a search space outside a preset time-frequency domain in the first symbol and a search space outside a first control channel unit of the second symbol, obtaining a second control channel unit based on a mapping mode of a time domain and a frequency domain.

Optionally, the search space configuration module is further configured to configure, when the device type is incompatible, a search space of the first symbol for the user equipment, so that the user equipment searches for the physical downlink control channel in a preset time-frequency domain in the first symbol.

Optionally, the device determining module is specifically configured to determine that the device type of the user equipment is compatible when it is determined that the user equipment has a function of processing a signal collision according to the device capability information; and under the condition that the user equipment is determined not to have the function of processing the signal conflict according to the equipment capability information, determining that the equipment type of the user equipment is incompatible.

In a fourth aspect, the present disclosure further provides a physical downlink control channel searching apparatus, where the apparatus is applied to a user equipment, and a device type of the user equipment is compatible, where the apparatus may include: a capability reporting module, configured to report device capability information to the NR base station; a signaling receiving module, configured to receive a radio resource control signaling sent by an NR base station, where the radio resource control signaling is used to allocate a combined search space of a first symbol and a second symbol and indicate a preset time-frequency domain, where the preset time-frequency domain is an initial time-frequency domain preset for a user equipment with an incompatible device type in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol without LTE cell reference signals; and the channel searching module is used for searching a physical downlink control channel outside a preset time frequency domain in a combined searching space of a first symbol and a second symbol distributed by the NR base station, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

In a fifth aspect, the present disclosure provides an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, where the program or instructions, when executed by the processor, implement the steps of the search space configuration method according to the first aspect or the physical downlink control channel search method according to the second aspect.

In a sixth aspect, the present disclosure provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor, implement the steps of the search space configuration method according to the first aspect, or the physical downlink control channel search method according to the second aspect.

In a seventh aspect, the present disclosure provides a chip, which includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is configured to execute a program or instructions to implement the steps of the search space configuration method according to the first aspect or the physical downlink control channel search method according to the second aspect.

In an eighth aspect, the present disclosure provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps as implementing the search space configuration method according to the first aspect, or the physical downlink control channel search method according to the second aspect.

The search space configuration method provided by the present disclosure can be applied to an NR base station, and the method can determine the device type of the user equipment according to the device capability information of the user equipment, and obtain a preset time-frequency domain in a first symbol when the device type is compatible, where the first symbol is an orthogonal frequency division multiplexing symbol not configured with an LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for the user equipment of which the device type is incompatible in a search space of the first symbol; then, control channel unit mapping is carried out in a search space of a second symbol and a search space outside a preset time-frequency domain in the first symbol, and the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; and sending a radio resource control signaling to the user equipment, thereby configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment, and indicating a preset time-frequency domain, so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space. The scheme configures the combined search space corresponding to the first symbol and the second symbol for the user equipment with compatible equipment type, so that the combined search space supports the configuration of enough aggregation level control channel units with quantity demand in actual search, fully utilizes the configuration resources of the search space, effectively improves the capacity and coverage rate of a cell, and simultaneously indicates the initial time-frequency domain reserved for the user equipment with incompatible equipment type through a wireless resource control signaling, avoids the invalid search of the compatible user equipment in the preset time-frequency domain, effectively reduces the energy consumption of the user equipment, shortens the search time, and improves the search efficiency.

Drawings

Fig. 1 is a schematic configuration diagram of an NR PDCCH in a DSS scenario provided in the embodiment of the present disclosure;

fig. 2 is a schematic diagram illustrating a search space configuration in the related art according to an embodiment of the present disclosure;

FIG. 3 is a second schematic diagram illustrating a search space configuration in the related art according to an embodiment of the present disclosure;

FIG. 4 is a flowchart illustrating steps of a method for configuring a search space according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a search space configuration provided in an embodiment of the present disclosure;

fig. 6 is a second flowchart illustrating steps of a search space allocation method according to an embodiment of the disclosure;

fig. 7 is a flowchart illustrating steps of a method for searching a physical downlink control channel according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a search space configuration apparatus according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a physical downlink control channel searching apparatus according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

fig. 11 is a hardware schematic diagram of an electronic device according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.

The terms "first," "second," and the like in the description and in the claims of the present disclosure are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the disclosure may be practiced other than those illustrated or described herein, and that the objects identified as "first," "second," etc. are generally a class of objects and do not limit the number of objects, e.g., a first object may be one or more. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

It is noted that the techniques described in the embodiments of the present disclosure are not limited to LTE (Long Term Evolution)/LTE-a (LTE-Advanced) systems, but may also be used in other wireless communication systems, such as CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), FDMA (Frequency Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), SC-FDMA (Single-carrier Frequency-Division Multiple Access), and other systems. The terms "system" and "network" are often used interchangeably in embodiments of the present application, and the described techniques may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes an NR (New Radio) system for exemplary purposes, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications, such as a 6G (6 th Generation ) communication system.

The terminology used in this disclosure is set forth, in part, as follows:

the OFDM symbol is applied to an OFDM data transmission mode. The orthogonal frequency division multiplexing divides the provided channels into sub-channels in the frequency domain, and the sub-channels are kept orthogonal, so that high-speed data streams can be converted into low-speed sub-data streams and modulated to the orthogonal sub-channels for parallel transmission, carrier interference is effectively reduced, the frequency band utilization rate is improved, and OFDM symbols can be the superposition of the sub-carriers on the time domain.

The LTE cell reference signal is used for Quality detection of a physical downlink control Channel in LTE and coherent detection and demodulation of a user equipment, a specific OFDM symbol may be configured in an LTE subframe to transmit an LTE CRS, and the user equipment may obtain information such as a CQI (Channel Quality Indicator), a PMI (Precoding Matrix Indicator), an RI (Rank Indicator) and the like by measuring the LTE CRS.

The NR PDCCH mainly carries a PDSCH (Physical Downlink Shared CHannel) and a PUSCH (Physical Uplink Shared CHannel) DCI (Downlink Control Information), so that the user equipment determines time-frequency domain Information for decoding the PDSCH by reading the DCI and assembles and transmits the time-frequency domain Information for PUSCH data. Unlike LTE, which occupies the entire bandwidth in the frequency domain, and fixed position in the time-frequency domain, the NR PDCCH no longer occupies the entire bandwidth in the frequency domain, and the starting position in the time domain can be flexibly adjusted. Therefore, the user equipment needs to search the time domain information and the frequency domain information of the NR PDCCH and determine the time-frequency domain position of the NR PDCCH, so as to further demodulate the NR PDCCH.

In general, information such as a frequency band occupied by the NR PDCCH in a frequency domain and an OFDM symbol occupied in a time domain is encapsulated in CORESET, and information such as a starting OFDM symbol and a monitoring period is encapsulated in a search space. The NR PDCCH is formed by aggregating CCEs, the number of CCEs, i.e., aggregation levels, may be any one of 1, 2, 3, 8, and 16, and each CCE is composed of 6 REGs (Resource Element groups). REGs are basic constituent units of CORESET, and each REG occupies one RB in the frequency domain and one OFDM symbol in the time domain. The CCE is a logical resource and can be transmitted only by a physical resource mapped on the CORESET in a CCE-REG mapping mode.

In practical application, the user equipment may determine the time-frequency domain resource scheduling condition of the NR PDCCH candidate according to the configured search space and the CORESET associated with the search space, where a start position of a time domain is determined by the configuration of the search space, and a length of the time domain and a width of the frequency domain are determined by the associated CORESET, so as to determine the time-frequency domain position of the NR PDCCH candidate.

NR PDCCH DMRS (Demodulation Reference Signal) is used for Demodulation of PDCCH in NR in the course of data transmission.

The search space configuration provided by the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings by specific embodiments and application scenarios thereof.

Fig. 4 is a flowchart illustrating steps of a search space configuration method according to an embodiment of the present disclosure. The method can be applied to an NR base station.

The NR base station refers to a network device in a 5G network that provides an air interface protocol function and connects communications between the user equipment and the core network, and the NR base station can implement a protocol processing function for a user plane and a control plane. In the embodiment of the present disclosure, the NR base station is mainly configured to configure a search space to the user equipment and implement mapping of CCEs to REGs.

As shown in fig. 4, the method may include the following steps 401 to 405.

Step 401, receiving the device capability information reported by the user equipment.

The NR base station may receive device capability information reported by the user equipment, where the device capability information may include functions supported by the user equipment in an NR network, so that the NR base station configures an adaptive function for the user equipment based on the device capability information. Before configuring the search space, the NR base station may send a ue capability query signaling to the ue to indicate device capability information required by the NR base station in the process of configuring the search space. Further, the device capability information reported by the user equipment according to the user equipment capability query signaling can be received to determine the functions supported by the user equipment.

Step 402, determining the device type of the user equipment according to the device capability information.

In the embodiment of the present disclosure, the device types may be distinguished according to functions supported by the user equipment in the search, demodulation, and the like of the NR PDCCH, including carrier, signal, and protocol types supported by the user equipment.

Step 403, when the device type is compatible, obtaining a preset time-frequency domain in a first symbol, where the first symbol is an orthogonal frequency division multiplexing symbol not configured with the LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for the user equipment of which the device type is incompatible in a search space of the first symbol.

The device types may include compatibility, incompatibility, and the like, and in dynamic spectrum sharing, the user equipment of the 5G NR may dynamically share spectrum resources through the 4G LTE subframe. The compatibility may refer to that the ue may transmit a signal on an ofdm symbol configured with an LTE cell reference signal, and the incompatibility may refer to that the ue cannot transmit a signal on an ofdm symbol configured with an LTE cell reference signal, at this time, in order to ensure that the incompatible ue can normally access, the ofdm symbol not configured with an LTE cell reference signal may be used as a first symbol, and an available initial time-frequency domain is preset in the first symbol for the ue of which the device type is incompatible, where the available initial time-frequency domain is only used by the ue of which the device type is incompatible, and the available initial time-frequency domain includes a USS (User Search Space) and a CSS (Common Search Space) of the incompatible ue. It should be noted that the preset time-frequency domain may already be occupied by the ue whose other device type is incompatible, or may still be in an idle state, but is not provided to the ue whose device type is compatible, so as to ensure normal and timely function configuration of the incompatible ue during access.

In the embodiment of the present disclosure, when it is determined that the device type of the user equipment is incompatible according to the device capability information, the preset time-frequency domain in the first symbol may be obtained, so as to subsequently instruct the user equipment to avoid the preset time-frequency domain in the process of searching for the NR PDCCH, and reduce the time for invalid search.

And 404, performing control channel unit mapping in a search space of a second symbol and a search space outside a preset time-frequency domain in the first symbol, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

Wherein, different from the first symbol, the second symbol may be an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal. In case that the device type of the user equipment is compatible, it indicates that the user equipment supports transmission of the signal on the second symbol. Therefore, the NR base station may perform the mapping of the control channel unit in the search spaces of all the second symbols and the search space outside the preset time-frequency domain in the first symbol when the device type of the user equipment is compatible, so as to obtain all available time-frequency domain resources of the user equipment with the compatible device type.

It should be noted that the first symbol and the second symbol are only distinguished by whether the LTE cell reference signal is configured. According to different configurations of the LTE cell reference information, in practical applications, the second symbol may be symbol 1 in an LTE subframe, and the first symbol may be symbol 2 in the LTE subframe, which is not specifically limited in the embodiment of the present disclosure.

Step 405, sending a radio resource control signaling to the ue, configuring a combined search space corresponding to the first symbol and the second symbol for the ue based on the radio resource control signaling, and indicating a preset time-frequency domain in the radio resource control signaling, so that the ue searches for a physical downlink control channel outside the preset time-frequency domain in the combined search space.

Further, the NR base station may combine the first symbol with the second symbol search space and configure the combined search space to a user equipment whose device type is compatible. The preset time-frequency domain reserved for the user equipment with the incompatible equipment type is contained in the combined search space, and the NR base station can also indicate the position of the preset time-frequency domain in the combined search space to the user equipment with the compatible equipment type, so that the preset time-frequency domain can be avoided and the search can be carried out in the search space integrated into one piece when the user equipment carries out PDCCH search in the combined search space.

The Radio Resource Control (RRC) signaling is used to manage and allocate Radio resources, and the NR base station may schedule the Radio resources to the ue through the RRC signaling, for example, may indicate to the ue that a search space configured for the NR base station is a combined search space of the first symbol and the second symbol. Further, in the embodiment of the present disclosure, the NR base station may further modify a field of the RRC signaling to indicate, to the ue, time-frequency domain resources reserved for other incompatible ues in the combined search space.

Fig. 5 is a schematic diagram of a search space configuration provided in an embodiment of the present disclosure, and as shown in fig. 5, an NR base station configures a merged search space 501 of a first symbol and a second symbol for a user equipment, and indicates a position of a preset time frequency domain 5011 in the merged search space 501 to the user equipment, so that the user equipment avoids invalid search in the search space integrated into one, and avoids a situation that the search space is too small and cannot be allocated or the number of CCEs allocated to a required aggregation level is too small, thereby ensuring a capacity and a coverage of a cell and reducing resource waste.

The method for configuring the search space can be applied to an NR base station, and can determine the equipment type of the user equipment according to the equipment capability information of the user equipment, and acquire a preset time-frequency domain in a first symbol when the equipment type is compatible, wherein the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with an LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for the user equipment of which the equipment type is incompatible in the search space of the first symbol; then, control channel unit mapping is carried out in a search space of a second symbol and a search space outside a preset time-frequency domain in the first symbol, and the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; and sending a radio resource control signaling to the user equipment, thereby configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment, and indicating a preset time-frequency domain, so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space. The scheme configures the merging search space corresponding to the first symbol and the second symbol for the user equipment with compatible equipment type, so that the merging search space supports the configuration of a sufficient number of aggregation level control channel units in actual search, fully utilizes the configuration resources of the search space, effectively improves the capacity and coverage rate of a cell, and simultaneously indicates the initial time-frequency domain reserved for the user equipment with incompatible equipment type through wireless resource control signaling, avoids invalid search of the compatible user equipment in the preset time-frequency domain, effectively reduces the energy consumption of the user equipment, shortens the search time, and improves the search efficiency.

Fig. 6 is a second flowchart illustrating steps of a search space allocation method according to an embodiment of the disclosure. The method may be applied to an NR base station, and as shown in fig. 6, the method may include the following steps 601 to 607.

Step 601, receiving the device capability information reported by the user equipment.

In the embodiment of the present disclosure, step 601 may correspond to the related description referring to step 401, and is not repeated herein to avoid repetition.

Step 602, determining the device type of the user equipment according to the device capability information.

In the embodiment of the present disclosure, step 602 may correspond to the related description of step 402, and is not repeated herein to avoid repetition.

In one method embodiment of the present disclosure, step 602 includes the following steps A1 through A2.

Step A1, under the condition that the user equipment is determined to have the function of processing signal conflict according to the equipment capability information, determining that the equipment type of the user equipment is compatible.

And step A2, determining that the equipment type of the user equipment is incompatible under the condition that the user equipment does not have the function of processing signal collision according to the equipment capability information.

In the embodiment of the present disclosure, the NR base station mainly configures a search space for the user equipment, and needs to consider LTE cell reference signals configured on OFDM symbols. Therefore, the device capability information may be information reflecting whether the ue has a function of processing signal collision, and when the device capability information reflects that the ue has a function of processing signal collision, it may be considered that the device type of the ue is compatible, that is, the ue may handle a collision problem between the NR PDCCH DMRS and the LTE CRS, and may be configured on the second symbol coinciding with the LTE CRS, or may be configured on the first symbol coinciding with the LTE CRS; conversely, when the device capability information reflects that the user equipment does not have a function of processing signal collision, it may be considered that the device type of the user equipment is incompatible, that is, the user equipment cannot handle the collision problem between the NR PDCCH DMRS and the LTE CRS, and thus can only be configured on the first symbol that is not overlapped with the LTE CRS.

Step 603, configuring a search space of the first symbol for the user equipment under the condition that the equipment types are incompatible, so that the user equipment searches the physical downlink control channel in a preset time-frequency domain in the first symbol.

When the device type is incompatible, the search space of the first symbol may be configured to the ue and indicate a preset time-frequency domain reserved for the ue, so that the ue with the incompatible device type may search for the PDCCH on a time-frequency domain resource that is not overlapped with the LTE CRS.

Step 604, when the device types are compatible, obtaining a preset time-frequency domain in a first symbol, where the first symbol is an orthogonal frequency division multiplexing symbol not configured with the reference signal of the LTE cell, and the preset time-frequency domain is an initial time-frequency domain preset for the user equipment whose device type is incompatible in a search space of the first symbol.

In the embodiment of the present disclosure, step 604 may refer to the related description of step 403, and is not repeated herein to avoid repetition.

Step 605, in the search space of the second symbol, obtaining a first control channel unit based on a mapping manner of a frequency domain, where the number of the first control channel units is determined according to a preset time-frequency domain, and the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

When mapping the control channel unit, the NR base station may first obtain the first control channel unit in a search space of the second symbol based on a frequency domain mapping manner, and a frequency domain position of the first control channel unit may correspond to a frequency domain position of a preset time-frequency domain in the first symbol. As shown in fig. 5, the NR base station may first obtain the first control channel elements CCE 1 to CCE N based on a mapping manner of a frequency domain in a search space 5012 of the second symbol, where frequency domain positions of the CCE 1 to CCE N correspond to frequency domain positions of a preset time-frequency domain in the first symbol.

Step 606, in the search space outside the preset time-frequency domain in the first symbol and the search space outside the first control channel unit of the second symbol, the second control channel unit is obtained based on the mapping mode of time domain before frequency domain.

The NR base station may further map, in a search space outside a preset time-frequency domain in the first symbol and a search space outside the first control channel unit in the second symbol, based on a time-domain-first-frequency-domain-second-frequency-domain manner, to obtain the second control channel unit. As shown in fig. 5, in the search space outside the first control channel element in the second symbol and the search space 5013 outside the preset time-frequency domain in the first symbol, the second control channel elements such as CCE N +1, CCE N +2, CCE N + M-1, CCE N + M, and the like are further mapped on the basis of CCE N according to the time-domain order of the second symbol and the first symbol. It can be seen that the search spaces of the first symbol and the second symbol are integrated into one in CCE mapping, thereby ensuring the aggregation level of CCEs and improving the cell capacity and coverage.

In a method embodiment of the present disclosure, the mapping includes any one of an interleaved mapping, a non-interleaved mapping.

The CCE mapping scheme of the NR base station may be interlace mapping or non-interlace mapping. In the interleaving mapping, the REGs mapped by the CCE are discretely distributed in the frequency domain in REG bundles (REG bundles), and the number of REGs contained in each REG Bundle may be 2, 3, or 6; in the non-interlace mapping, the number of REGs contained in each REG Bundle is 6, each CCE consists of 1 REG Bundle, and the CCE and the REG Bundle are numbered the same.

Step 607, sending a radio resource control signaling to the ue, configuring a combined search space corresponding to the first symbol and the second symbol for the ue based on the radio resource control signaling, and indicating a preset time-frequency domain in the radio resource control signaling, so that the ue searches for a physical downlink control channel outside the preset time-frequency domain in the combined search space.

In the embodiment of the present disclosure, step 607 may refer to the related description of step 405, and is not repeated herein to avoid repetition.

Wherein, the NR base station may configure a combined search space for combining the first symbol and the second symbol according to parameters such as SearchSpace- > duration, searchSpace- > monitoring symbols within the radio resource control signaling, meanwhile, fields are added in a mode similar to that a frequency domain resources parameter indicates the position of a frequency domain, and a monitorSymbolsWithanSlot parameter indicates the position of a time domain, so that the position of a preset time-frequency domain is indicated.

It should be noted that, data acquired by the present disclosure, including data such as a device type of a user device, are all accessed, acquired, stored and applied to subsequent analysis and processing after information such as acquisition content, data usage, processing manner, etc. of the data is explicitly notified to a user or a party to whom the related data belongs, and a way of accessing, correcting, and deleting the data can be sent to the user or the party to whom the related data belongs, and a method of revoking the way of granting and authorizing.

The search space configuration method provided by the present disclosure can be applied to an NR base station, and the method can determine the device type of the user equipment according to the device capability information of the user equipment, and obtain a preset time-frequency domain in a first symbol when the device type is compatible, where the first symbol is an orthogonal frequency division multiplexing symbol not configured with an LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for the user equipment of which the device type is incompatible in a search space of the first symbol; then control channel unit mapping is carried out in the search space of a second symbol and the search space outside a preset time-frequency domain in the first symbol, and the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; and sending a radio resource control signaling to the user equipment, thereby configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment, and indicating a preset time-frequency domain, so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space. The scheme configures the combined search space corresponding to the first symbol and the second symbol for the user equipment with compatible equipment type, so that the combined search space supports the configuration of enough aggregation level control channel units with quantity demand in actual search, fully utilizes the configuration resources of the search space, effectively improves the capacity and coverage rate of a cell, and simultaneously indicates the initial time-frequency domain reserved for the user equipment with incompatible equipment type through a wireless resource control signaling, avoids the invalid search of the compatible user equipment in the preset time-frequency domain, effectively reduces the energy consumption of the user equipment, shortens the search time, and improves the search efficiency.

Fig. 7 is a flowchart illustrating steps of a physical downlink control channel searching method according to an embodiment of the present disclosure. The method may be applied to a user equipment of which the device type is compatible, and as shown in fig. 7, the method may include the following steps 701 to 703.

Step 701, reporting the device capability information to the NR base station.

The user equipment may report the device capability information to the NR base station, so as to provide the NR device with a function supported by itself in the NR network, and thus, the NR base station may configure a suitable service for itself. When the device type of the ue is compatible, the device capability information reported by the NR base station may be used to indicate that the device type of the ue is compatible. The ue may report the corresponding device capability information according to the ue query signaling when receiving the ue capability query signaling sent by the NR base station, which may specifically refer to the related description of step 401, and is not described herein again for avoiding repetition.

Step 702, receiving a radio resource control signaling sent by the NR base station, where the radio resource control signaling is used to allocate a combined search space of a first symbol and a second symbol and indicate a preset time-frequency domain, where the preset time-frequency domain is an initial time-frequency domain preset for a user equipment with an incompatible device type in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol without LTE cell reference signals.

The ue may determine the allocated combined search space and the preset time-frequency domain reserved for the incompatible ue in the search space according to the radio resource control signaling sent by the NR base station. Specifically, the sending process of the rrc signaling in step 702 may refer to the foregoing descriptions of steps 401 to 405 or steps 601 to 607, and is not repeated herein for avoiding repetition.

And 703, searching a physical downlink control channel outside a preset time-frequency domain in a combined search space of a first symbol and a second symbol distributed by the NR base station, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

The user equipment with the compatible equipment type can process the signal conflict problem of the NR PDCCH DMRS and the LTE CRS, so that in the combined search space of the first symbol and the second symbol distributed by the NR base station, the preset time-frequency domain is avoided to search the PDCCH, and the PDCCH of the first symbol and the second symbol is used for signal transmission, so that the resource utilization rate of the PDCCH can be effectively improved, the higher CCE aggregation level configuration is supported, the cell capacity and the coverage rate are improved, and the search traversal times can be effectively reduced by avoiding the preset time-frequency domain, so that the power consumption of the user equipment is reduced, and the PDCCH search efficiency is improved.

The method for searching the physical downlink control channel can be applied to user equipment with compatible equipment types, and the user equipment can report equipment capacity information to an NR (noise-and-noise) base station and receive a radio resource control signaling sent by the NR base station, wherein the radio resource control signaling is used for allocating a combined search space of a first symbol and a second symbol and indicating a preset time-frequency domain, the preset time-frequency domain is an initial time-frequency domain preset for the user equipment with the incompatible equipment types in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with LTE (long term evolution) cell reference signals; and then the user equipment can preset a time-frequency domain outside to search a physical downlink control channel in a combined search space of a first symbol and a second symbol allocated by the NR base station, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal. In the scheme, the user equipment with the compatible equipment type can be allocated to the combined search space corresponding to the first symbol and the second symbol, so that the combined search space supports the configuration of a sufficient number of aggregation level control channel units required in actual search, the configuration resources of the search space are fully utilized, the capacity and the coverage rate of a cell are effectively improved, and meanwhile, the initial time-frequency domain reserved for the user equipment with the incompatible equipment type is obtained through the wireless resource control signaling, so that the user equipment can avoid searching the physical downlink control channel by the preset time-frequency domain, the invalid search is reduced, the energy consumption of the user equipment is effectively reduced, the search time is shortened, and the search efficiency is improved.

Fig. 8 is a schematic structural diagram of a search space configuration apparatus 800 according to an embodiment of the present disclosure, where the search space configuration apparatus 800 may be applied to an NR base station, and as shown in fig. 8, the search space configuration apparatus 800 may include: a report receiving module 801, configured to receive device capability information reported by a user equipment; a device determining module 802, configured to determine a device type of the user equipment according to the device capability information; a preset time-frequency domain determining module 803, configured to, when the device type is compatible, obtain a preset time-frequency domain in a first symbol, where the first symbol is an orthogonal frequency division multiplexing symbol where the LTE cell reference signal is not configured, and the preset time-frequency domain is an initial time-frequency domain preset for a user equipment whose device type is incompatible in a search space of the first symbol; a control channel unit mapping module 804, configured to perform control channel unit mapping in a search space of a second symbol and a search space outside a preset time-frequency domain in the first symbol, where the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; a search space configuration module 805, configured to send a radio resource control signaling to the ue, configure a combined search space corresponding to the first symbol and the second symbol for the ue based on the rrc signaling, and indicate the preset time-frequency domain in the radio resource control signaling, so that the ue searches for a physical downlink control channel outside the preset time-frequency domain in the combined search space.

In an embodiment of the present disclosure, the control channel unit mapping module 804 is specifically configured to obtain, in a search space of the second symbol, a first control channel unit based on a frequency domain mapping manner, where the number of the first control information units is determined according to a preset time-frequency domain; and obtaining a second control channel unit based on a mapping mode of a time domain and a frequency domain in a preset search space outside a time-frequency domain in the first symbol and a search space outside a first control channel unit of the second symbol.

In an embodiment of an apparatus of the present disclosure, the search space configuring module 805 is further configured to configure, when the device types are incompatible, a search space of the first symbol for the user equipment, so that the user equipment searches for a physical downlink control channel in a time-frequency domain preset in the first symbol.

In an embodiment of an apparatus of the present disclosure, the device determining module 802 is specifically configured to determine that the device type of the user equipment is compatible when it is determined that the user equipment has a function of processing a signal collision according to the device capability information; and under the condition that the user equipment is determined not to have the function of processing the signal conflict according to the equipment capability information, determining that the equipment type of the user equipment is incompatible.

In an apparatus embodiment of the present disclosure, the mapping includes any one of an interleaved mapping and a non-interleaved mapping.

The search space configuration method provided by the present disclosure can be applied to an NR base station, and the method can determine the device type of the user equipment according to the device capability information of the user equipment, and obtain a preset time-frequency domain in a first symbol when the device type is compatible, where the first symbol is an orthogonal frequency division multiplexing symbol not configured with an LTE cell reference signal, and the preset time-frequency domain is an initial time-frequency domain preset for the user equipment of which the device type is incompatible in a search space of the first symbol; then control channel unit mapping is carried out in the search space of a second symbol and the search space outside a preset time-frequency domain in the first symbol, and the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal; and sending a radio resource control signaling to the user equipment, thereby configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment, and indicating a preset time-frequency domain, so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space. The scheme configures the merging search space corresponding to the first symbol and the second symbol for the user equipment with compatible equipment type, so that the merging search space supports the configuration of a sufficient number of aggregation level control channel units in actual search, fully utilizes the configuration resources of the search space, effectively improves the capacity and coverage rate of a cell, and simultaneously indicates the initial time-frequency domain reserved for the user equipment with incompatible equipment type through wireless resource control signaling, avoids invalid search of the compatible user equipment in the preset time-frequency domain, effectively reduces the energy consumption of the user equipment, shortens the search time, and improves the search efficiency.

The search space configuration apparatus provided in the embodiment of the present disclosure can implement each process implemented in the method embodiments of fig. 4 to fig. 6, and is not described here again to avoid repetition.

Fig. 9 is a schematic structural diagram of a physical downlink control channel searching apparatus 900 according to an embodiment of the present disclosure, where the physical downlink control channel searching apparatus 900 may be applied to a user equipment, and a device type of the user equipment is compatible. The apparatus 900 for searching the physical downlink control channel includes: a capability reporting module 901, configured to report device capability information to an NR base station; a signaling receiving module 902, configured to receive a radio resource control signaling sent by an NR base station, where the radio resource control signaling is used to allocate a combined search space of a first symbol and a second symbol and indicate a preset time-frequency domain, where the preset time-frequency domain is an initial time-frequency domain preset for a user equipment with an incompatible device type in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol without LTE cell reference signals configured; a channel searching module 903, configured to search a physical downlink control channel outside a preset time-frequency domain in a combined search space of a first symbol and a second symbol allocated by the NR base station, where the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

The searching device of the physical downlink control channel can be applied to user equipment with compatible equipment type, the user equipment can report equipment capability information to an NR base station and receive a radio resource control signaling sent by the NR base station, wherein the radio resource control signaling is used for allocating a combined search space of a first symbol and a second symbol and indicating a preset time-frequency domain, the preset time-frequency domain is an initial time-frequency domain preset for the user equipment with incompatible equipment type in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with LTE cell reference signals; and then the user equipment can preset a time-frequency domain outside to search a physical downlink control channel in a combined search space of a first symbol and a second symbol allocated by the NR base station, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal. In the scheme, the user equipment with the compatible equipment type can be allocated to the combined search space corresponding to the first symbol and the second symbol, so that the combined search space supports the configuration of a sufficient number of aggregation level control channel units required in actual search, the configuration resources of the search space are fully utilized, the capacity and the coverage rate of a cell are effectively improved, and meanwhile, the initial time-frequency domain reserved for the user equipment with the incompatible equipment type is obtained through the wireless resource control signaling, so that the user equipment can avoid searching the physical downlink control channel by the preset time-frequency domain, the invalid search is reduced, the energy consumption of the user equipment is effectively reduced, the search time is shortened, and the search efficiency is improved.

The apparatus for searching a physical downlink control channel provided in the embodiment of the present disclosure can implement each process implemented in the embodiment of the method in fig. 7, and is not described here again to avoid repetition.

Fig. 10 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the present disclosure, as shown in fig. 10, the electronic device 1000 may include a processor 1001, a memory 1002, and a program or an instruction stored in the memory 1002 and executable on the processor 1001, where the program or the instruction implements the processes of the search space configuration embodiment when executed by the processor 1001, and can achieve the same technical effect, and no further description is provided here to avoid repetition.

It should be noted that the electronic device 1000 shown in fig. 10 is only an example, and should not bring any limitation to the functions and the scope of the application of the embodiments of the present disclosure.

Fig. 11 is a hardware schematic diagram of an electronic device 1100 according to an embodiment of the present disclosure, and as shown in fig. 11, the electronic device 1100 includes a Central Processing Unit (CPU) 1101, which can perform various suitable actions and processes according to a program stored in a ROM (Read Only Memory) 1102 or a program loaded from a storage portion 1108 into a RAM (Random Access Memory) 1103. In the RAM 1103, various programs and data necessary for system operation are also stored. The CPU1101, ROM 1102, and RAM 1103 are connected to each other by a bus 1104. An I/O (Input/Output) interface 1105 is also connected to the bus 1104.

The following components are connected to the I/O interface 1105: an input portion 1106 including a keyboard, mouse, and the like; an output section 1107 including a CRT (Cathode Ray Tube), LCD (Liquid Crystal Display), and the like, a speaker, and the like; a storage section 1108 including a hard disk and the like; and a communication section 1109 including a Network interface card such as a LAN (Local Area Network) card, a modem, and the like. The communication section 1109 performs communication processing via a network such as the internet. A driver 1110 is also connected to the I/O interface 1105 as necessary. A removable medium 1111 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 1110 as necessary, so that a computer program read out therefrom is mounted into the storage section 1108 as necessary.

In particular, the processes described below with reference to the flow diagrams may be implemented as computer software programs, according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 1109 and/or installed from the removable medium 1111. When the computer program is executed by the central processing unit (CPU 1101), various functions defined in the system of the present application are executed.

The embodiment of the present disclosure also provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the process of the search space configuration embodiment is implemented, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.

The processor is the processor in the electronic device in the above embodiment. Readable storage media, including computer readable storage media such as ROM, RAM, magnetic or optical disks, and the like.

The embodiment of the present disclosure further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the search space configuration embodiment, and the same technical effect can be achieved.

It should be understood that the chips mentioned in the embodiments of the present disclosure may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

The embodiments of the present disclosure provide a computer program product including instructions, which when running on a computer, enables the computer to perform the steps of configuring the search space as described above, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element. Further, it is noted that the scope of the methods and apparatus in the embodiments of the present disclosure is not limited to performing functions in the order shown or discussed, but may include performing functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, an electronic device, an air conditioner, or a network device) to execute the methods of the embodiments of the present disclosure.

While the embodiments of the present disclosure have been described in connection with the appended drawings, the present disclosure is not limited to the specific embodiments, which have been described above for illustrative purposes only and not for purposes of limitation, and it will be appreciated by those of ordinary skill in the art that, in light of the present disclosure, numerous modifications may be made without departing from the spirit of the disclosure and scope of the appended claims.

Claims

1. A method for configuring search space is applied to an NR base station, and comprises the following steps:

receiving equipment capability information reported by user equipment;

determining the equipment type of the user equipment according to the equipment capability information;

acquiring a preset time-frequency domain in a first symbol under the condition that the equipment types are compatible, wherein the first symbol is an orthogonal frequency division multiplexing symbol which is not configured with LTE cell reference signals, and the preset time-frequency domain is an initial time-frequency domain preset for user equipment with the equipment types being incompatible in a search space of the first symbol;

performing control channel unit mapping in a search space of a second symbol and the search space outside the preset time-frequency domain in the first symbol, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal;

sending a radio resource control signaling to the user equipment, configuring a combined search space corresponding to the first symbol and the second symbol for the user equipment based on the infinite resource control signaling, and indicating the preset time-frequency domain in the radio resource control signaling, so that the user equipment searches a physical downlink control channel outside the preset time-frequency domain in the combined search space.

2. The method as claimed in claim 1, wherein the mapping of the control channel elements outside the preset time-frequency domain in the second symbol and the first symbol comprises:

in the search space of the second symbol, obtaining a first control channel unit based on a mapping mode of a frequency domain, wherein the number of the first control channel units is determined according to the preset time-frequency domain;

and acquiring a second control channel unit in a search space outside the preset time-frequency domain in the first symbol and a search space outside the first control channel unit in the second symbol based on a mapping mode of a time domain and a frequency domain.

3. The method according to claim 1, wherein after determining the device type of the ue according to the device capability information, further comprising:

and under the condition that the equipment types are incompatible, configuring a search space of the first symbol for the user equipment so that the user equipment searches a physical downlink control channel in the preset time-frequency domain in the first symbol.

4. The method of claim 1, wherein the determining the device type of the UE according to the device capability information comprises:

determining that the equipment type of the user equipment is compatible under the condition that the user equipment is determined to have the function of processing signal collision according to the equipment capability information;

and under the condition that the user equipment is determined not to have the function of processing signal conflict according to the equipment capability information, determining that the equipment type of the user equipment is incompatible.

5. The method of claim 1, wherein the mapping comprises any one of an interleaved mapping and a non-interleaved mapping.

6. A method for searching a Physical Downlink Control Channel (PDCCH), the method being applied to a User Equipment (UE), wherein the UE is compatible in terms of device type, the method comprising:

reporting the equipment capability information to an NR base station;

receiving a radio resource control signaling sent by the NR base station, wherein the radio resource control signaling is used for allocating a combined search space of a first symbol and a second symbol and indicating a preset time-frequency domain, the preset time-frequency domain is an initial time-frequency domain preset for user equipment with incompatible equipment types in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol without configuring an LTE cell reference signal;

and searching a physical downlink control channel outside the preset time frequency domain in a combined search space of the first symbol and a second symbol allocated by the NR base station, wherein the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

7. An apparatus for configuring search space, the apparatus being applied to an NR base station, the apparatus comprising:

a report receiving module, configured to receive device capability information reported by a user equipment;

the equipment determining module is used for determining the equipment type of the user equipment according to the equipment capability information;

a preset time-frequency domain determining module, configured to, when the device type is compatible, obtain a preset time-frequency domain in a first symbol, where the first symbol is an orthogonal frequency division multiplexing symbol where an LTE cell reference signal is not configured, and the preset time-frequency domain is an initial time-frequency domain preset for a user equipment whose device type is incompatible in a search space of the first symbol;

a control channel unit mapping module, configured to perform control channel unit mapping in a search space of a second symbol and a search space outside the preset time-frequency domain in the first symbol, where the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal;

a search space configuration module, configured to send a radio resource control signaling to the ue, configure a combined search space corresponding to the first symbol and the second symbol for the ue based on the rrc signaling, and indicate the preset time-frequency domain in the radio resource control signaling, so that the ue searches for a physical downlink control channel outside the preset time-frequency domain in the combined search space.

8. A physical downlink control channel searching apparatus, wherein the apparatus is applied to a user equipment, and a device type of the user equipment is compatible, the apparatus comprising:

a capability reporting module, configured to report device capability information to an NR base station;

a signaling receiving module, configured to receive a radio resource control signaling sent by the NR base station, where the radio resource control signaling is used to allocate a combined search space of a first symbol and a second symbol and indicate a preset time-frequency domain, where the preset time-frequency domain is an initial time-frequency domain preset for a user equipment with an incompatible device type in the search space of the first symbol, and the first symbol is an orthogonal frequency division multiplexing symbol without LTE cell reference signals configured;

a channel searching module, configured to search a physical downlink control channel outside the preset time-frequency domain in a combined search space of the first symbol and a second symbol allocated by the NR base station, where the second symbol is an orthogonal frequency division multiplexing symbol configured with an LTE cell reference signal.

9. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the search space configuration method according to any one of claims 1 to 5 or the physical downlink control channel search method according to claim 6.

10. A readable storage medium, on which a program or instructions are stored, which when executed by a processor, implement the search space configuration method according to any one of claims 1 to 5 or the physical downlink control channel search method according to claim 6.