CN116349366A

CN116349366A - Method and device for receiving and transmitting physical downlink control channel

Info

Publication number: CN116349366A
Application number: CN202380008322.8A
Authority: CN
Inventors: 王磊
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-06-27
Also published as: WO2024168892A1

Abstract

The disclosure relates to the technical field of communication, in particular to a method and a device for receiving and sending a physical downlink control channel, wherein the method for receiving the physical downlink control channel comprises the following steps: determining that the common search space overlaps with the uplink transmission on the time domain resource; and receiving a physical downlink control channel according to a first mode, wherein the first mode is indicated by network equipment or agreed by a protocol. According to the method and the device, when the CSS and the uplink transmission are overlapped on the time domain resource, the terminal can receive the physical downlink control channel according to the first mode indicated by the network equipment or agreed by the protocol, so that the terminal can receive the PDCCH in a determined mode, and the efficiency of blind detection of the PDCCH in the CSS by the terminal is guaranteed.

Description

Method and device for receiving and transmitting physical downlink control channel

Technical Field

The present disclosure relates to the field of communication technologies, and in particular, to a physical downlink control channel receiving method, a physical downlink control channel transmitting method, a physical downlink control channel receiving apparatus, a physical downlink control channel transmitting apparatus, a communication system, a terminal, a network device, and a computer readable storage medium.

Background

The terminal may blindly check the physical downlink control channel (Physical Downlink Control Channel, PDCCH) in the common search space (Common Search Space, CSS). However, in some cases, there is a collision between the CSS and the uplink transmission of the terminal, which may cause a problem in receiving the PDCCH by the terminal.

Disclosure of Invention

The embodiments of the present disclosure propose a physical downlink control channel receiving method, a physical downlink control channel transmitting method, a physical downlink control channel receiving device, a physical downlink control channel transmitting device, a communication system, a terminal, a network device, and a computer readable storage medium, so as to solve the technical problems in the related art.

According to a first aspect of an embodiment of the present disclosure, a method for receiving a physical downlink control channel is provided, which is performed by a terminal, and the method includes: determining that the common search space overlaps with the uplink transmission on the time domain resource; and receiving a physical downlink control channel according to a first mode, wherein the first mode is indicated by network equipment or agreed by a protocol.

According to a second aspect of the embodiments of the present disclosure, a method for transmitting a physical downlink control channel is provided, which is performed by a network device, and the method includes: determining that the common search space overlaps with the uplink transmission on the time domain resource; and sending a physical downlink control channel to the terminal according to a first mode, wherein the first mode is agreed by a protocol or determined by the network equipment.

According to a third aspect of the embodiments of the present disclosure, there is provided a physical downlink control channel receiving apparatus, including: a receiving module configured to determine that the common search space overlaps with the uplink transmission on the time domain resource; and receiving a physical downlink control channel according to a first mode, wherein the first mode is indicated by network equipment or agreed by a protocol.

According to a fourth aspect of an embodiment of the present disclosure, there is provided a physical downlink control channel transmitting apparatus, including: a transmitting module configured to determine that the common search space overlaps with the uplink transmission on the time domain resource; and sending a physical downlink control channel to the terminal according to a first mode, wherein the first mode is agreed by a protocol or determined by network equipment.

According to a fifth aspect of the embodiments of the present disclosure, a communication system is provided, which includes a terminal configured to implement the above-mentioned physical downlink control channel receiving method, and a network device configured to implement the above-mentioned physical downlink control channel transmitting method.

According to a sixth aspect of the embodiments of the present disclosure, there is provided a terminal, including: a processor; a memory for storing a computer program; wherein the above-described physical downlink control channel receiving method is implemented when the computer program is executed by a processor.

According to a seventh aspect of embodiments of the present disclosure, there is provided a network device, including: a processor; a memory for storing a computer program; the method for transmitting the physical downlink control channel is realized when the computer program is executed by a processor.

According to an eighth aspect of the embodiments of the present disclosure, a computer readable storage medium is provided for storing a computer program, which when executed by a processor, implements the above-mentioned physical downlink control channel receiving method.

According to a ninth aspect of the embodiments of the present disclosure, a computer readable storage medium is provided for storing a computer program, which when executed by a processor, implements the above-mentioned physical downlink control channel transmission method.

According to the embodiment of the disclosure, when the CSS and the uplink transmission overlap on the time domain resource, the terminal can receive the physical downlink control channel according to the first mode indicated by the network device or agreed by the protocol, so that the terminal can receive the PDCCH in a certain mode, which is beneficial to ensuring the efficiency of blind detection of the PDCCH in the CSS by the terminal.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a schematic view of an application scenario shown according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of uplink and downlink resources, shown according to an embodiment of the present disclosure.

Fig. 3 is a schematic flow chart diagram illustrating a physical downlink control channel receiving method according to an embodiment of the present disclosure.

Fig. 4A to 4C are schematic diagrams illustrating overlapping of a common search space and uplink transmission on time domain resources according to an embodiment of the present disclosure.

Fig. 5 is a schematic flow chart diagram illustrating another physical downlink control channel receiving method according to an embodiment of the present disclosure.

Fig. 6 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure.

Fig. 7 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure.

Fig. 8 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure.

Fig. 9 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure.

Fig. 10 is a schematic flow chart diagram illustrating a physical downlink control channel transmission method according to an embodiment of the present disclosure.

Fig. 11 is a schematic diagram illustrating interaction of a terminal with a network device according to an embodiment of the present disclosure.

Fig. 12 is a schematic block diagram of a physical downlink control channel receiving apparatus according to an embodiment of the present disclosure.

Fig. 13 is a schematic block diagram of a physical downlink control channel transmitting apparatus according to an embodiment of the present disclosure.

Fig. 14 is a schematic block diagram illustrating an apparatus for physical downlink control channel transmission according to an embodiment of the present disclosure.

Fig. 15 is a schematic block diagram illustrating an apparatus for physical downlink control channel reception in accordance with an embodiment of the present disclosure.

Detailed Description

The embodiments or examples of the present disclosure are not intended to be exhaustive, but rather are merely illustrative of some of the embodiments or examples, and are not intended to limit the scope of the disclosure in any way. Each step in a certain implementation manner or embodiment may be implemented as an independent embodiment, and the steps may be arbitrarily combined, for example, a scheme after removing part of the steps in a certain implementation manner or embodiment may be implemented as an independent embodiment, and the order of the steps in a certain implementation manner or embodiment may be arbitrarily exchanged, and further, an optional manner or optional embodiment in a certain implementation manner or embodiment may be arbitrarily combined; furthermore, various embodiments or examples may be arbitrarily combined, for example, some or all steps of different embodiments or examples may be arbitrarily combined, and a certain embodiment or example may be arbitrarily combined with alternative modes or alternative examples of other embodiments or examples.

In some implementations or examples, "responsive to … …," "in the case of … …," "at … …," "when … …," "if … …," "if … …," and the like in the present disclosure may be replaced with each other.

In some implementations or embodiments, the description modes of "a or B", "a and/or B", "at least one of a and B", "a in one case a", "B in another case", "a in response to one case a", "B" in response to another case, and the like of the disclosure may include at least one of the following technical solutions according to circumstances: a is performed independently of B, i.e., a in some implementations or embodiments; b is performed independently of a, i.e., B in some implementations or embodiments; A. b is selectively performed, i.e., in some implementations or embodiments selected from a and B; A. b are all performed, i.e., a and B in some implementations or embodiments.

In some implementations or embodiments, "comprising a", "including a", "for indicating a", "carrying a" in the present disclosure may be interpreted as carrying a directly, or as indicating a indirectly.

Furthermore, each element, each row, or each column in the tables to which the present disclosure relates may be implemented as a separate embodiment, and any combination of elements, any rows, or any columns may also be implemented as a separate embodiment.

As shown in fig. 1, embodiments of the present disclosure may be applied in a scenario in which a terminal communicates with a network device, but are not limited to this scenario. The respective bodies shown in fig. 1 are examples, and the embodiment or example of the present disclosure may include all or part of the bodies in fig. 1, or may include other bodies than fig. 1, and the number of the respective bodies is arbitrary, and is not limited to fig. 1. The connection relationships shown in fig. 1 are examples, and any bodies may be connected without or with each other, and the connection may be any manner, direct connection or indirect connection, wired connection, or wireless connection.

In one embodiment, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a wearable device, a sensor, an internet of things device, and the like. The terminal may communicate with network devices including, but not limited to, network devices in 4G, 5G, 6G, etc. communication systems, e.g., base stations, core networks, etc

As shown in fig. 2, the network device configures an uplink subband for the terminal in a downlink time domain resource (e.g., a semi-static downlink symbol), where the uplink subband is an uplink resource, and frequency domain resources other than the uplink subband and a guard band (guard band) in a frequency domain resource corresponding to the downlink time domain resource are downlink resources, where the downlink resource may also be referred to as a downlink subband. And a guard band is arranged between the downlink resource and the uplink resource, the guard band is not used for transmitting information, and the information comprises data and/or signals, so that frequency domain isolation can be realized to a certain extent, and interference between uplink communication and downlink communication is avoided.

It should be noted that, the embodiments of the present disclosure may be applicable to a case where a guard band is provided between a downlink resource and an uplink resource, and may also be applicable to a case where a guard band is not provided between a downlink resource and an uplink resource. The following partial embodiments exemplify the present disclosure in the case where a guard band is provided between a downlink resource and an uplink resource.

The terminal may perform uplink transmission in an uplink subband of the downlink time domain resource, where the terminal may be a full duplex terminal, or may be a legacy (legacy) terminal, and the legacy terminal may be a half duplex terminal. The network device may be a full duplex network device, and may receive uplink transmission of the terminal in an uplink subband of the downlink time domain resource, and may send CSS to the terminal in the cell in a frequency domain resource other than the uplink subband in the frequency domain resource corresponding to the downlink time domain resource. Wherein the PDCCH in the CSS may be a common PDCCH,

in this case, the CSS and the uplink transmission overlap in the downlink time domain resources. The uplink transmission of the terminal may cause Cross-link interference (Cross-Link Interference, CLI) to the downlink transmission (e.g., the above CSS), thereby causing a problem in the process of blind-checking the PDCCH in the CSS by the terminal.

The embodiment of the disclosure can be applied to the scene that the CSS and the uplink transmission overlap in the downlink time domain resource, and can also be applied to the scene that other CSS and uplink transmission overlap in the time domain resource.

Fig. 3 is a schematic flow chart diagram illustrating a physical downlink control channel receiving method according to an embodiment of the present disclosure. The physical downlink control channel receiving method shown in this embodiment may be executed by the terminal. As shown in fig. 3, the physical downlink control channel receiving method may include the steps of:

in step S301, it is determined that a Common Search Space (CSS) overlaps with an uplink transmission on a time domain resource;

in step S302, a Physical Downlink Control Channel (PDCCH) is received according to a first scheme, wherein the first scheme is indicated by a network device or agreed upon by a protocol.

In one embodiment, the uplink transmission includes at least one of:

uplink transmissions on dynamically scheduled resources, e.g., dynamically scheduled PUSCH (Physical Uplink Shared Channel );

uplink transmissions on preconfigured resources, e.g., on CG PUSCH, where CG may be interpreted as a configured grant (configured grant).

In one embodiment, overlapping the common search space with the uplink transmission on the time domain resource includes at least one of:

The first time domain unit where the public search space is located is partially overlapped with the second time domain unit where the uplink transmission is located;

the first time domain unit where the common search space is located and the second time domain unit where the uplink transmission is located are all overlapped.

Taking the example that CSS and uplink transmission overlap in downlink time slots, i.e. the above-mentioned time domain resources comprise downlink time slots, in this case the time slots may be referred to as sub-band Full Duplex (SBFD) time slots. Overlapping CSS and uplink transmissions on time domain resources may include any of the cases of fig. 4A-4C.

As shown in fig. 4a, the time domain resource where the css is located and the time domain resource where the uplink transmission is located are completely overlapped. As shown in fig. 4B, the time domain resource where the CSS is located partially overlaps with the time domain resource where the uplink transmission is located. As shown in fig. 4C, the time slot in which the CSS is located overlaps with the time slot in which the uplink transmission is located, but in the overlapping time slot, the time domain resource in which the CSS is located does not overlap with the time domain resource in which the uplink transmission is located.

In one embodiment, the uplink transmission includes at least one of:

Uplink transmission in an uplink subband configured in a flexible time domain unit;

uplink transmission in an uplink subband configured in a downlink time domain unit.

Wherein the time domain unit comprises at least one of: a frame, a subframe, a slot, a symbol (symbol), which may be an OFDM (Orthogonal Frequency Division Multiplexing ) symbol.

When the CSS and the uplink transmission overlap on the time domain resource, there is a problem that the uplink transmission causes cross link interference to the CSS, so that a problem occurs in a process of blind detection of the PDCCH in the CSS by the terminal.

In one embodiment, the first mode is at least one of:

aggregation levels (Aggregation Level, AL) of candidate physical downlink control channels (PDCCH candidates) in the common search space are not expected to be less than the first aggregation level;

the mapping mode of the candidate physical downlink control channels in the public search space is not expected to comprise local mapping (localized mapping);

A size (size) of a resource element bundle (REG bundle, where REG is named Resource Element Group) of candidate physical downlink control channels in the common search space is not expected to be greater than the first size;

the candidate physical downlink control channels in the common search space are not expected to employ narrowband demodulation reference signals (DMRS, demodulation Reference Signal).

Fig. 5 is a schematic flow chart diagram illustrating another physical downlink control channel receiving method according to an embodiment of the present disclosure. The physical downlink control channel receiving method shown in this embodiment may be executed by the terminal. As shown in fig. 5, the physical downlink control channel receiving method further includes:

in step S501, in the common search space, candidate physical downlink control channels are blind-detected according to an aggregation level greater than or equal to the first aggregation level.

It should be noted that the embodiment shown in fig. 5 may be implemented independently or in combination with at least one other embodiment in the disclosure, and specifically may be selected as needed, which is not limited by the disclosure.

In one embodiment, the aggregation level may represent the number of CCEs (Control-Channel elements) constituting the PDCCH.

When the aggregation level is relatively small, for example, the aggregation level is less than or equal to the first aggregation level, CCEs constituting the PDCCH are also small. In this case, when CSS and uplink are overlapped in the time domain, the uplink will interfere with reception of CCEs by the terminal, and since there are few CCEs constituting the PDCCH, when a specific number of CCEs receive interference of the uplink, there will also be a large interference with reception of the PDCCH.

Therefore, the terminal may not expect the aggregation level of PDCCH transmitting in the CSS to be less than the first aggregation level. Correspondingly, the network device does not send the PDCCH with the aggregation level smaller than the first aggregation level in the CSS in the overlapped time domain resources. And the terminal blindly detects the PDCCH transmitted by the network equipment according to the aggregation level blind detection PDCCH transmitting ate which is greater than or equal to the first aggregation level in the CSS.

Since the aggregation level of the PDCCH that is blind-detected is relatively large, that is, many CCEs constituting the PDCCH, uplink transmission causes interference to reception of CCEs by the terminal, but since many CCEs constituting the PDCCH cause relatively small interference to the PDCCH when a specific number of CCEs are interfered by uplink transmission. And the PDCCH redundancy bits with relatively large aggregation level are relatively more, so that the decoding accuracy of the PDCCH is improved. Therefore, it is advantageous to ensure the reception quality of the PDCCH.

In one embodiment, the first aggregation level may be agreed upon by a protocol, may be indicated by a network device, and may be determined according to capability information sent by the terminal to the network device.

For example, the first aggregation level is 8, and the configuration of the CSS transmitted by the network device to the terminal includes only aggregation levels 8, 16, and does not include an aggregation level less than 8. Correspondingly, the terminal blindly detects PDCCH candidate in the CSS according to aggregation levels 8 and 16, respectively, whereas blind detection of PDCCH candidate according to aggregation levels less than 8 (e.g., 2, 4) is not desirable.

In one embodiment, receiving a physical downlink control channel according to a first mode includes: and when the public search space comprises candidate physical downlink control channels with aggregation level smaller than the first aggregation level, ignoring the candidate physical downlink control channels with aggregation level smaller than the first aggregation level.

When the configuration of the CSS sent by the network device to the terminal includes an aggregation level smaller than the first aggregation level, the terminal may ignore the candidate physical downlink control channels with the aggregation level smaller than the first aggregation level, that is, only blind-check the PDCCH candidate according to the aggregation level greater than or equal to the first aggregation level in the configuration of the CSS.

For example, the configuration of CSS transmitted by the network device to the terminal includes aggregation levels 2, 4, 8, 16, and the first aggregation level is 8. The terminal blindly detects PDCCH candidates only according to aggregation levels 8 and 16, respectively, and ignores PDCCH candidates with aggregation levels 2 and 4, i.e., does not blindly detect PDCCH candidates according to aggregation levels 2 or 4, in the CSS.

Accordingly, it is possible to ensure that the aggregation level of the blind-detected PDCCH is relatively large, that is, that the CCEs constituting the PDCCH are large, and that uplink transmission causes interference to the terminal receiving CCEs, but since the CCEs constituting the PDCCH are large, when a specific number of CCEs are interfered by uplink transmission, the CCEs cause relatively small interference to the PDCCH. Therefore, it is advantageous to ensure the reception quality of the PDCCH.

In one embodiment, the method for receiving a physical downlink control channel further includes:

and blind-detecting the candidate physical downlink control channels in the public search space according to the configuration of the public search space, wherein the configuration of the public search space does not comprise an aggregation level smaller than the first aggregation level, or the configuration of the public search space does not comprise the candidate physical downlink control channels with the aggregation level smaller than the first aggregation level.

When the configuration of the CSS sent by the network device to the terminal does not include an aggregation level smaller than the first aggregation level, or the common search space does not include a candidate physical downlink control channel with an aggregation level smaller than the first aggregation level, the aggregation level of the PDCCH blindly detected by the terminal according to any one of the aggregation levels in the configuration of the CSS is greater than or equal to the first aggregation level, the PDCCH is relatively less affected by uplink transmission, and the receiving quality of the PDCCH is relatively high, so that the PDCCH can be blindly detected in the CSS according to the configuration of the CSS without omitting any one of the aggregation levels.

It should be noted that, in addition to the aggregation level, the CCS configuration may also include other configuration information, which is not limited in this disclosure.

For example, the first aggregation level is 8, and the configuration of the CSS transmitted by the network device to the terminal includes only the aggregation level 16, and does not include the aggregation level smaller than 8. The terminal blindly detects PDCCH candidate in the CSS according to the configuration of the CSS without having to ignore any aggregation level.

Fig. 6 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure. The physical downlink control channel receiving method shown in this embodiment may be executed by the terminal. As shown in fig. 6, the physical downlink control channel receiving method further includes:

in step S601, candidate physical downlink control channels are blind-detected in the common search space according to the mapping method of the distribution map (distributed mapping).

It should be noted that the embodiment shown in fig. 6 may be implemented independently or in combination with at least one other embodiment in the disclosure, and specifically may be selected as needed, which is not limited by the disclosure.

In one embodiment, when mapping PDCCH to Resource Element (RE), the network device may use two mapping methods, one is local mapping and the other is distributed mapping.

When local mapping is employed, the PDCCH may be mapped onto relatively concentrated REs. In this case, when the CSS overlaps with the uplink transmission in the time domain, the uplink transmission may cause interference to the terminal in receiving the PDCCH on the REs, and since the REs on which the PDCCH is located are relatively concentrated, once the interference is caused, the PDCCH reception is interfered on relatively more REs, which results in a larger interference to the PDCCH reception.

With distributed mapping, the PDCCH is mapped to relatively scattered REs. In this case, when the CSS overlaps with the uplink transmission in the time domain, the uplink transmission may cause interference to the terminal receiving the PDCCH on the REs, but since the REs on which the PDCCH is located are relatively scattered, interference may be caused, but among the REs to which the PDCCH is mapped, only the PDCCH reception is interfered on relatively fewer REs, and thus, it is not easy to cause a large interference to the PDCCH reception.

Therefore, when mapping the PDCCH to the REs in the CSS, the network device may map the PDCCH to the REs in the CSS in a distributed mapping manner instead of using a local mapping manner. Correspondingly, the terminal may not expect that the mapping manner of PDCCH candidates in the CSS includes local mapping, and then may blindly detect PDCCH candidates in the CSS according to the mapping manner of distribution mapping. Accordingly, the PDCCH which is beneficial to blind detection cannot receive larger interference, so that the receiving quality of the PDCCH is ensured.

Fig. 7 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure. The physical downlink control channel receiving method shown in this embodiment may be executed by the terminal. As shown in fig. 7, the physical downlink control channel receiving method further includes:

In step S701, blind detection candidate physical downlink control channels are bundled according to a resource element group smaller than or equal to a first size in a common search space.

It should be noted that the embodiment shown in fig. 7 may be implemented independently or in combination with at least one other embodiment in the disclosure, and specifically may be selected as needed, which is not limited by the disclosure.

In one embodiment, one or more CCEs may be aggregated into a PDCCH, with one CCE containing one or more regbundles and one CCE containing a fixed number of REGs, e.g., containing 6 REGs. The REG bundle contains one or more REGs, and the number of REGs contained in the REG bundle may be referred to as the size of the REG bundle, for example, in case the CCE contains 6 REGs, the size of the REG bundle may be 2, 3, 6, etc.

When the size of the REG bundle is relatively large, for example, larger than the first size, the number of REGs contained in the REG bundle is relatively large, and when the CCE contains a fixed number of REGs, the number of REG bundles contained in the CCE is relatively small, and the number of REG bundles contained in the PDCCH is relatively small. In this case, when the CSS overlaps with the uplink transmission in the time domain, the uplink transmission may interfere with the reception of the REG bundle, and since the PDCCH includes relatively fewer REG bundles, once the reception of the REG bundle is interfered, relatively more REG bundles in the PDCCH may be caused to interfere, thereby causing a larger interference to the PDCCH reception.

When the size of the REG bundle is relatively small, e.g., less than or equal to the first size, the number of REGs contained in the REG bundle is relatively small, and when the CCE contains a fixed number of REGs, the number of REG bundles contained in the CCE is relatively large, and the number of REG bundles contained in the PDCCH is relatively large. In this case, when the CSS overlaps with the uplink transmission in the time domain, the uplink transmission may interfere with the reception of the REG bundle, and since the PDCCH includes a relatively large number of REG bundles, the reception of the REG bundle may be interfered, but among the REG bundles included in the PDCCH, only a relatively small number of REG bundles may interfere, and thus the reception of the PDCCH is not easily interfered greatly.

Thus, when aggregating CCEs into PDCCHs, the network device may set a relatively small size for REG bundles in the CCEs, e.g., set the size of the REG bundles to be less than or equal to the first size. Correspondingly, the terminal may not expect the size of REG bundle of PDCCH candidates in the CSS to be greater than the first size, and then the terminal blindly detects PDCCH candidates according to REG bundles less than or equal to the first size in the CSS. Accordingly, the PDCCH which is beneficial to blind detection cannot receive larger interference, so that the receiving quality of the PDCCH is ensured.

The first size may be agreed by a protocol, or may be configured by a network device, for example, including but not limited to 2, 3, 6, etc. For example, when the first size is 3 and the network device aggregates CCEs into PDCCHs, the size of the REG bundle may be set to 2 for REG bundles in CCEs, and the terminal does not expect that the size of the REG bundle of PDCCH candidates in CSS is greater than 3, and then blindly detects PDCCH candidates in CSS according to the REG bundle size of 2 or 3.

Fig. 8 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure. The physical downlink control channel receiving method shown in this embodiment may be executed by the terminal. As shown in fig. 8, the physical downlink control channel receiving method further includes:

in step S801, candidate physical downlink control channels in the common search space are demodulated according to a wideband demodulation reference signal.

It should be noted that the embodiment shown in fig. 8 may be implemented independently or in combination with at least one other embodiment in the disclosure, and specifically may be selected as needed, which is not limited by the disclosure.

In one embodiment, the terminal may demodulate PDCCH candidate in the CSS according to the DMRS. Wherein, the DMRS comprises two kinds, one is a narrow-band DMRS and the other is a broadband DMRS.

The narrowband DMRS means that the DMRS is mapped only on REGs for actually transmitting PDCCH in CORESET (cotrol resurgeset).

Broadband DMRS refers to DMRS mapped on all REGs in CORESET, regardless of whether the REGs actually transmitted PDCCH or not.

That is, for the same CORESET, there are more DMRS corresponding to wideband DMRS than narrowband DMRS.

When CSS overlaps with uplink transmission in the time domain, the uplink transmission may cause interference to DMRS. If the PDCCH transmitting in the CSS adopts a narrowband DMRS, because the DMRS are relatively fewer, the proportion of the DMRS that are interfered is larger, the reception quality of the DMRS is worse, and the accuracy of demodulating the PDCCH transmitting according to the DMRS is relatively lower, thereby resulting in lower reception quality of the PDCCH. And if the PDCCH candidate in the CSS adopts broadband DMRS, the proportion of the interfered DMRS is smaller because of relatively more DMRS, the receiving quality of the DMRS can still be better, and the accuracy of demodulating the PDCCH candidate according to the DMRS can also be higher, thereby being beneficial to ensuring the good receiving quality of the PDCCH.

Accordingly, the network device may employ a wideband DMRS for PDCCH transmitting in CSS. Accordingly, the terminal may not expect the narrowband DMRS of PDCCH candidates in the CSS, and the terminal may demodulate the PDCCH candidates in the CSS according to the wideband DMRS scheme. Accordingly, the accuracy of demodulating PDCCH candidate according to the DMRS can be higher, and the method is beneficial to ensuring good receiving quality of PDCCH.

Fig. 9 is a schematic flow chart diagram illustrating yet another physical downlink control channel receiving method according to an embodiment of the present disclosure. The physical downlink control channel receiving method shown in this embodiment may be executed by the terminal. As shown in fig. 9, the method further includes:

in step S901, capability indication information is sent to a network device, where the capability indication information is used to indicate that the terminal supports receiving a physical downlink control channel according to a first mode when a common search space overlaps with an uplink transmission on a time domain resource.

It should be noted that the embodiment shown in fig. 9 may be implemented independently or in combination with at least one other embodiment in the disclosure, and specifically may be selected as needed, which is not limited by the disclosure.

In one embodiment, the terminal may send capability indication information to the network device, by which the terminal indicates whether the terminal supports receiving the PDCCH according to the first scheme when the CSS overlaps with the uplink transmission on the time domain resource.

If the terminal supports that when the CSS and the uplink transmission overlap on the time domain resource, the PDCCH is received according to the first mode, and the network device may configure the terminal on the time domain resource to perform uplink transmission, and also send the CSS to the terminal on the time domain resource.

If the terminal does not support the receiving of the PDCCH according to the first mode when the CSS and the uplink transmission are overlapped on the time domain resource, the network equipment can not send the CSS to the terminal on the time domain resource when the network equipment configures the terminal to carry out the uplink transmission on the time domain resource; or, when the CSS is sent to the terminal on the time domain resource, the terminal may not be configured on the time domain resource to perform uplink transmission. Correspondingly, the terminal does not expect that the time domain resource where the CSS is located overlaps with the time domain resource where the uplink transmission is located.

Fig. 10 is a schematic flow chart diagram illustrating a physical downlink control channel transmission method according to an embodiment of the present disclosure. The physical downlink control channel sending method shown in the embodiment may be executed by a network device, where the network device may communicate with a terminal, where the network device includes, but is not limited to, a base station in a communication system such as a 4G base station, a 5G base station, and a 6G base station, and the terminal includes, but is not limited to, a mobile phone, a tablet computer, a wearable device, a sensor, and a communication device such as an internet of things device.

As shown in fig. 10, the physical downlink control channel transmission method may include the steps of:

in step S1001, it is determined that the common search space overlaps with the uplink transmission on the time domain resource;

In step S1002, a physical downlink control channel is sent to a terminal according to a first manner, where the first manner is agreed upon by a protocol or determined for a network device.

In one embodiment, the uplink transmission includes at least one of:

uplink transmissions on dynamically scheduled resources, e.g., dynamically scheduled PUSCH;

uplink transmissions on preconfigured resources, e.g. on CG PUSCH.

In one embodiment, the uplink transmission includes at least one of:

Wherein the time domain unit comprises at least one of: a frame, a subframe, a slot, a symbol (symbol), which may be an OFDM symbol.

Since the CSS and the uplink are overlapped on the time domain resource, there is a problem that the uplink may cause cross link interference to the CSS, so that a problem occurs in a process of blind detection of the PDCCH in the CSS by the terminal.

According to the embodiment of the disclosure, when the CSS and the uplink transmission overlap on the time domain resource, the network device may send the physical downlink control channel to the terminal according to the first mode determined autonomously, and instruct the terminal to the first mode, or send the physical downlink control channel to the terminal according to the first mode agreed by the protocol. Correspondingly, the terminal can receive the physical downlink control channel according to the first mode indicated by the network equipment or agreed by the protocol, so that the terminal can receive the PDCCH in a determined mode, and the efficiency of blind detection of the PDCCH in the CSS by the terminal is guaranteed.

In one embodiment, the first mode is at least one of:

the aggregation level of PDCCH candidate in the CSS is not set to be smaller than the first aggregation level;

the mapping mode without setting PDCCH candidate in CSS includes local mapping (localized mapping);

the size (size) of the REG bundle without PDCCH candidate in CSS is larger than the first size;

the PDCCH transmitting in CSS is not set and a narrowband DMRS is used.

In one embodiment, the aggregation level of the candidate physical downlink control channels in the common search space is greater than or equal to the first aggregation level.

In one embodiment, the aggregation level may represent the number of CCEs constituting the PDCCH.

Accordingly, the network device may not transmit the PDCCH having the aggregation level smaller than the first aggregation level in the CSS in the overlapping time domain resources. And the terminal blindly detects the PDCCH transmitted by the network equipment according to the aggregation level blind detection PDCCH transmitting ate which is greater than or equal to the first aggregation level in the CSS.

Since the aggregation level of the PDCCH blindly detected by the terminal is relatively large, that is, there are many CCEs constituting the PDCCH, the uplink transmission causes interference to the terminal receiving CCEs, but since there are many CCEs constituting the PDCCH, when a specific number of CCEs are interfered by the uplink transmission, the uplink transmission causes relatively small interference to the PDCCH. And the PDCCH redundancy bits with relatively large aggregation level are relatively more, so that the decoding accuracy of the PDCCH is improved. Therefore, it is advantageous to ensure the reception quality of the PDCCH.

The configuration of the CSS sent by the network device to the terminal may also include an aggregation level smaller than the first aggregation level. When the configuration of the CSS sent by the network device to the terminal includes an aggregation level smaller than the first aggregation level, the terminal may ignore the candidate physical downlink control channels with the aggregation level smaller than the first aggregation level, that is, only blind-check the PDCCH candidate according to the aggregation level greater than or equal to the first aggregation level in the configuration of the CSS.

In one embodiment, the candidate physical downlink control channels in the common search space are mapped according to a mapping manner of the distribution mapping.

In one embodiment, when mapping PDCCH onto RE, the network device may use two mapping methods, one is local mapping and the other is distributed mapping.

In one embodiment, the size of the bundle of resource element groups in the common search space is less than or equal to the first size.

In one embodiment, transmitting a physical downlink control channel to a terminal according to a first mode includes: and sending the candidate physical downlink control channels in the public search space according to the mode of the broadband demodulation reference signal.

Narrowband DMRS means that the DMRS is mapped only on REGs in CORESET for actually transmitting PDCCH.

In one embodiment, the method further comprises: and receiving capability indication information sent by the terminal, wherein the capability indication information is used for indicating whether the terminal supports the receiving of the physical downlink control channel according to the first mode when the public search space and the uplink transmission overlap on the time domain resource.

If it is determined that the terminal supports that when the CSS and the uplink transmission overlap on the time domain resource, the PDCCH is received according to the first mode, and the network device may also send the CSS to the terminal on the time domain resource when the terminal is configured to perform the uplink transmission on the time domain resource.

If it is determined that the terminal does not support the receiving of the PDCCH according to the first mode when the CSS and the uplink transmission are overlapped on the time domain resource, the network device may not transmit the CSS to the terminal on the time domain resource when the network device configures the terminal to perform the uplink transmission on the time domain resource; or, when the CSS is sent to the terminal on the time domain resource, the terminal may not be configured on the time domain resource to perform uplink transmission. Correspondingly, the terminal does not expect that the time domain resource where the CSS is located overlaps with the time domain resource where the uplink transmission is located.

As shown in fig. 11, when the CSS and the uplink transmission overlap on the time domain resource, the network device may autonomously determine the first mode and indicate the first mode to the terminal, and send the downlink control channel to the terminal according to the first mode, or may determine the first mode according to the protocol convention and then send the downlink control channel to the terminal according to the first mode.

When the CSS overlaps with the uplink transmission on the time domain resource, the terminal may receive the PDCCH according to a first mode indicated by the network device or agreed by a protocol.

For example, the terminal blindly detects candidate physical downlink control channels in the common search space according to an aggregation level greater than or equal to the first aggregation level.

For example, the terminal blindly detects the candidate physical downlink control channel in the public search space according to the mapping mode of the distribution mapping.

For example, the terminal bundles blind detection candidate physical downlink control channels according to the resource element groups smaller than or equal to the first size in the common search space.

For example, the terminal demodulates the candidate physical downlink control channel in the public search space according to the mode of the broadband demodulation reference signal.

It should be noted that, for other content related to this embodiment, reference is made to the description of the related content in each embodiment, and no further description is given here.

The present disclosure also provides embodiments of a physical downlink control channel receiving apparatus and a physical downlink control channel transmitting apparatus, corresponding to the foregoing embodiments of a physical downlink control channel receiving method and a physical downlink control channel transmitting method.

Fig. 12 is a schematic block diagram of a physical downlink control channel receiving apparatus according to an embodiment of the present disclosure. As shown in fig. 12, the physical downlink control channel receiving apparatus includes:

A receiving module 1201 configured to determine that the common search space overlaps with the uplink transmission on the time domain resource; and receiving a physical downlink control channel according to a first mode, wherein the first mode is indicated by the network equipment or agreed by a protocol.

In one embodiment, the first mode is at least one of:

the aggregation level of the candidate physical downlink control channels in the public search space is not expected to be smaller than the first aggregation level;

the mapping mode of the candidate physical downlink control channel in the public search space is not expected to comprise local mapping;

the size of the bundle of resource elements of the candidate physical downlink control channel in the common search space is not expected to be greater than the first size;

the candidate physical downlink control channels in the common search space are not expected to employ narrowband demodulation reference signals.

In one embodiment, the receiving module is configured to blindly test the candidate physical downlink control channels in the common search space according to an aggregation level greater than or equal to the first aggregation level.

In one embodiment, the receiving module is configured to blindly detect candidate physical downlink control channels in a common search space according to a configuration of the common search space, where the configuration of the common search space does not include an aggregation level smaller than the first aggregation level, or the configuration of the common search space does not include candidate physical downlink control channels with an aggregation level smaller than the first aggregation level.

In one embodiment, the receiving module is configured to blindly detect the candidate physical downlink control channel in the common search space according to a mapping manner of the distribution mapping.

In one embodiment, the receiving module is configured to bundle blind-check candidate physical downlink control channels according to a set of resource elements of a first size or less in the common search space.

In one embodiment, the receiving module is configured to demodulate the candidate physical downlink control channels in the common search space according to a wideband demodulation reference signal.

In one embodiment, the apparatus further comprises: and the sending module is configured to send capability indication information to the network equipment, wherein the capability indication information is used for indicating the terminal to support the receiving of the physical downlink control channel according to the first mode when the public search space and the uplink transmission are overlapped on the time domain resource.

In one embodiment, the uplink transmission includes at least one of:

uplink transmission in an uplink subband configured in the flexible time domain unit;

Fig. 13 is a schematic block diagram of a physical downlink control channel transmitting apparatus according to an embodiment of the present disclosure. As shown in fig. 13, the physical downlink control channel transmitting apparatus includes:

a transmitting module 1301 configured to determine that the common search space overlaps with the uplink transmission on the time domain resource; and sending a physical downlink control channel to the terminal according to a first mode, wherein the first mode is agreed by a protocol or determined by network equipment.

In one embodiment, the sending module is configured to send the candidate physical downlink control channels in the common search space according to a wideband demodulation reference signal.

In one embodiment, the apparatus further comprises:

and the receiving module is configured to receive capability indication information sent by the terminal, wherein the capability indication information is used for indicating whether the terminal supports the physical downlink control channel according to the first mode when the public search space and the uplink transmission are overlapped on the time domain resource.

In one embodiment, the uplink transmission includes at least one of:

For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

The embodiment of the disclosure also provides a communication system, which comprises a terminal and a network device, wherein the terminal is configured to implement the physical downlink control channel receiving method according to any one of the embodiments, and the network device is configured to implement the physical downlink control channel sending method according to any one of the embodiments.

The embodiment of the disclosure also provides a terminal, which comprises: a processor; a memory for storing a computer program; the method for receiving a physical downlink control channel according to any one of the embodiments is implemented when the computer program is executed by a processor.

The embodiment of the disclosure also proposes a network device, including: a processor; a memory for storing a computer program; the method for transmitting a physical downlink control channel according to any one of the embodiments is implemented when the computer program is executed by a processor.

Embodiments of the present disclosure also provide a computer readable storage medium storing a computer program, which when executed by a processor, implements the physical downlink control channel receiving method according to any one of the above embodiments.

Embodiments of the present disclosure also provide a computer readable storage medium storing a computer program, which when executed by a processor, implements the physical downlink control channel transmission method according to any one of the above embodiments.

As shown in fig. 14, fig. 14 is a schematic block diagram illustrating an apparatus 1400 for physical downlink control channel transmission according to an embodiment of the disclosure. The apparatus 1400 may be a base station. Referring to fig. 14, the apparatus 1400 includes a processing component 1422, a wireless transmit/receive component 1424, an antenna component 1426, and a signal processing portion specific to a wireless interface, where the processing component 1422 may further include one or more processors. One of the processors in processing component 1422 may be configured to implement the physical downlink control channel transmission method described in any of the embodiments above.

Fig. 15 is a schematic block diagram illustrating an apparatus 1500 for physical downlink control channel reception in accordance with an embodiment of the present disclosure. For example, apparatus 1500 may be a terminal, such as a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical device, exercise device, personal digital assistant, or the like.

Referring to fig. 15, apparatus 1500 may include one or more of the following components: a processing component 1502, a memory 1504, a power component 1506, a multimedia component 1508, an audio component 1510, an input/output (I/O) interface 1512, a sensor component 1514, and a communication component 1516.

The processing component 1502 generally controls overall operation of the apparatus 1500, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 1502 may include one or more processors 1520 to execute instructions to implement all or part of the steps of the physical downlink control channel receiving method described in any of the embodiments above. Further, the processing component 1502 may include one or more modules that facilitate interactions between the processing component 1502 and other components. For example, the processing component 1502 may include a multimedia module to facilitate interaction between the multimedia component 1508 and the processing component 1502.

The memory 1504 is configured to store various types of data to support operations at the apparatus 1500. Examples of such data include instructions for any application or method operating on the apparatus 1500, contact data, phonebook data, messages, pictures, video, and the like.

The power supply assembly 1506 provides power to the various components of the apparatus 1500. The power supply component 1506 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus 1500.

The multimedia component 1508 comprises a screen between the device 1500 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user.

The audio component 1510 is configured to output and/or input audio signals. For example, the audio component 1510 includes a Microphone (MIC) configured to receive external audio signals when the device 1500 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 1504 or transmitted via the communication component 1516. In some embodiments, the audio component 1510 further comprises a speaker for outputting audio signals.

The I/O interface 1512 provides an interface between the processing component 1502 and peripheral interface modules, which can be keyboards, click wheels, buttons, and the like. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.

The sensor assembly 1514 includes one or more sensors for providing status assessment of various aspects of the apparatus 1500.

The communication component 1516 is configured to facilitate communication between the apparatus 1500 and other devices in a wired or wireless manner. The apparatus 1500 may access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G LTE, 5G NR, or a combination thereof. In one exemplary embodiment, the communication component 1516 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 1516 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 1500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for performing the physical downlink control channel receiving method described in any of the embodiments above.

In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 1504, including instructions executable by processor 1520 of apparatus 1500 to perform the physical downlink control channel receiving method of any of the embodiments described above. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for receiving a physical downlink control channel, the method being performed by a terminal, the method comprising:

determining that the common search space overlaps with the uplink transmission on the time domain resource;

and receiving a physical downlink control channel according to a first mode, wherein the first mode is determined by network equipment or agreed by a protocol.

2. The method of claim 1, wherein the first mode is at least one of:

the size of the resource element bundles of the candidate physical downlink control channels in the common search space is not expected to be larger than the first size;

3. The method according to claim 2, wherein the method further comprises:

and in the public search space, blind detection of candidate physical downlink control channels is performed according to the aggregation level which is greater than or equal to the first aggregation level.

4. A method according to claim 2 or 3, characterized in that the method further comprises:

and blind-detecting candidate physical downlink control channels in the public search space according to the configuration of the public search space, wherein the configuration of the public search space does not comprise an aggregation level smaller than the first aggregation level, or the configuration of the public search space does not comprise candidate physical downlink control channels with the aggregation level smaller than the first aggregation level.

5. The method according to claim 2, wherein the method further comprises:

and blind-detecting the candidate physical downlink control channels in the public search space according to the mapping mode of the distribution mapping.

6. The method according to claim 2, wherein the method further comprises:

and bundling blind detection candidate physical downlink control channels according to the resource element groups smaller than or equal to the first size in the public search space.

7. The method according to claim 2, wherein the method further comprises:

and demodulating the candidate physical downlink control channels in the public search space according to the mode of the broadband demodulation reference signal.

8. The method according to any of claims 1 to 7, wherein the overlapping of the common search space with the uplink transmission over time domain resources comprises at least one of:

and the first time domain unit where the public search space is located and the second time domain unit where the uplink transmission is located are all overlapped.

9. The method according to any one of claims 1 to 8, further comprising:

and sending capability indication information to the network equipment, wherein the capability indication information is used for indicating the terminal to support the receiving of a physical downlink control channel according to the first mode when the public search space and uplink transmission overlap on time domain resources.

10. The method according to any of claims 1 to 9, wherein the uplink transmission comprises at least one of:

11. A method for transmitting a physical downlink control channel, the method being performed by a network device, the method comprising:

and sending a physical downlink control channel to the terminal according to a first mode, wherein the first mode is agreed by a protocol or determined by the network equipment.

12. The method of claim 11, wherein the aggregation level of the candidate physical downlink control channels in the common search space is greater than or equal to the first aggregation level.

13. The method according to claim 11 or 12, wherein the candidate physical downlink control channels in the common search space are mapped according to a mapping manner of the distribution mapping.

14. The method according to any of claims 11 to 13, wherein the size of the bundle of resource elements in the common search space is smaller than or equal to the first size.

15. The method according to any of claims 11 to 14, wherein said transmitting a physical downlink control channel to a terminal according to the first mode comprises:

And sending the candidate physical downlink control channels in the public search space according to the mode of the broadband demodulation reference signal.

16. The method according to any of claims 11 to 15, wherein the overlapping of the common search space with the uplink transmission over time domain resources comprises at least one of:

17. The method according to any one of claims 11 to 16, further comprising:

and receiving capability indication information sent by the terminal, wherein the capability indication information is used for indicating whether the terminal supports the physical downlink control channel according to the first mode when the public search space and the uplink transmission overlap on time domain resources.

18. The method according to any one of claims 11 to 17, wherein the uplink transmission comprises at least one of:

19. A physical downlink control channel receiving apparatus, the apparatus comprising:

and the receiving module is configured to determine that the common search space and the uplink transmission overlap on time domain resources, and receive the physical downlink control channel according to a first mode, wherein the first mode is indicated by network equipment or agreed by a protocol.

20. A physical downlink control channel transmitting apparatus, the apparatus comprising:

and the sending module is configured to determine that the public search space and the uplink transmission overlap on time domain resources, and send a physical downlink control channel to the terminal according to a first mode, wherein the first mode is agreed by a protocol or determined by network equipment.

21. A communication system comprising a terminal configured to implement the physical downlink control channel receiving method of any one of claims 1 to 10, and a network device configured to implement the physical downlink control channel transmitting method of any one of claims 11 to 18.

22. A terminal, comprising:

A processor;

a memory for storing a computer program;

wherein the physical downlink control channel receiving method of any one of claims 1 to 10 is implemented when the computer program is executed by a processor.

23. A network device, comprising:

a processor;

a memory for storing a computer program;

wherein the physical downlink control channel transmission method of any one of claims 11 to 18 is implemented when the computer program is executed by a processor.

24. A computer readable storage medium storing a computer program, characterized in that the physical downlink control channel receiving method according to any one of claims 1 to 10 is implemented when the computer program is executed by a processor.

25. A computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the physical downlink control channel transmission method of any one of claims 11 to 18.