PDCCH structure for coverage-limited scenarios

Abstract

According to a first embodiment, a method may include receiving, by a user equipment, a first physical downlink control channel (PDCCH) configuration from a network entity. The method may also include detecting, by the user equipment, at least one PDCCH based on the first PDCCH configuration. The method may also include sending and / or receiving, by the user equipment, at least one signal based on the detected at least one PDCCH.

Description

Technical Field

[0001] Various communication systems may benefit from improved PDCCH coverage. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) New Radio (NR) Release (Rel)-15 describes operations associated with frequencies up to 52.6 GHz. Although the fifth generation (5G) Rel-15 physical channels are designed and optimized for scenarios below 52.6 GHz, higher frequencies are associated with very large spectrum allocations and can support additional high-capacity applications. 3GPP RAN considers 5G NR beyond the 52.6 GHz spectrum range, use cases, and deployment scenarios and requirements, which may be provided in future releases. In addition, NR spectrum options for beyond 52.6 GHz may include potential high millimeter wave bands for 5G and beyond (such as 70 / 80 / 92-114 GHz).

[0003] 3GPP RP-180453 and RP-180320 are considering NR above 52.6 GHz, especially with respect to waveform design for operation above 52.6 GHz, and physical layer design for operation above 52.3 GHz. Such design may have various goals, such as efficient transceiver design that provides power efficiency and simplicity. In addition, consideration may be given to improving coverage to support operation under high propagation loss conditions, and continuing to support physical layer channel design below 52.6 GHz from NR Rel-15 when needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] For a proper understanding of the present disclosure, reference should be made to the accompanying drawings, in which:

[0005] Figure 1 The diagram shows candidate digital solutions for scenarios above 52.6 GHz.

[0006] Figure 2 Interleaved and non-interleaved CCE-to-REG mappings are illustrated.

[0007] Figure 3 An example of a PDCCH structure according to certain embodiments is illustrated.

[0008] Figure 4 An example of two CORESETs according to certain embodiments is illustrated.

[0009] Figure 5 An example of timely distribution of CCEs of a CORESET is illustrated in accordance with certain embodiments.

[0010] Figure 6 An example of a signaling diagram according to some embodiments is illustrated.

[0011] Figure 7 An example of another method performed by a user equipment according to some embodiments is illustrated.

[0012] Figure 8 An example of a method performed by a network entity according to some embodiments is illustrated.

[0013] Fig. 9 An example of a system architecture according to some embodiments is illustrated. DETAILED DESCRIPTION

[0014] Systems above 52.6 GHz may need to be configured to handle increased path loss, larger antenna arrays, and less efficient RF components, such as power amplifiers. Therefore, systems above 52.6 GHz may be more noise limited, such as at the cell edge, requiring more power from the power amplifier. Due to the low PAPR properties of a single carrier (SC), SC waveforms are preferred over OFDM. A lower PAPR waveform can enable the power amplifier to operate at a higher power in order to maintain coverage. However, similar to Rel-15 UL, CP-OFDM modulation may still be beneficial to non-power-limited UEs, such as for the same receiver complexity, due to higher spectral efficiency with a higher modulation and coding scheme (MCS) and / or multiple-input multiple-output (MIMO) order.

[0015] PA efficiency can also be a factor in downlink transmissions due to limitations in large antenna arrays and / or component technology. Therefore, SC-based waveforms can be standardized for downlink transmissions in order to maximize coverage and power amplifier efficiency while continuing to support traditional OFDM for providing high throughput to UEs under favorable radio propagation conditions. For example, larger antenna arrays can provide higher beamforming gain, which can be achieved through higher-order analog beamforming.

[0016] NR provides support for multiple digital schemes. For example, Table 1 in the following 3GPP Technical Specification (TS) 38.211 describes the transmission digital schemes supported by NR.

[0017]

[0018]

[0019] These larger subcarrier spacings (Δf) can provide larger carrier bandwidth for a given Fast Fourier Transform (FFT) size (such as FFT sizes of 4096 or 8192), as well as smaller symbol durations, and potentially lower latency. These transmission parameters can also provide smaller channel access overhead due to a finer granularity frame design. There can be reduced sensitivity to phase noise, and / or reduced cyclic prefixes.

[0020] NR Rel-15 also supports bandwidth parts (BWP) of 275 physical resource blocks (PRBs). Therefore, the maximum BWP size according to NR Rel-15 is 792MHz (0.24MHz*12*275), which is insufficient for scenarios where the channel bandwidth above 52.6GHz can be up to 10GHz. In addition, there may be additional phase noise. A larger subcarrier spacing can be used to limit the phase noise and provide a larger carrier bandwidth with a reasonable FFT size. This can be provided, for example, by extending the digital scheme scaling architecture defined in NR Rel-15 to support additional values ​​of μ, such as Figure 1 The values ​​shown in , which may include scaling of the 2^μ subcarrier spacing, the IFFT / FFT block length 2^μ, and the LTE-related clock rate 2^μ.

[0021] 3GPP TS 38.300 describes the PDCCH operation in NR licensed band operation. In particular, the PDCCH can be used to schedule DL transmissions on the PDSCH and UL transmissions on the PUSCH. The PDCCH can also be used for other purposes, such as BWP switching or transmitting power control commands for multiple UEs at the same time. The DCI on the PDCCH may include a downlink assignment containing at least the MCS format, resource allocation, and hybrid ARQ information related to the DL-SCH, and in addition, may include an uplink scheduling grant containing at least the MCS format, resource allocation, and hybrid ARQ information related to the UL-SCH. The UE can monitor the PDCCH candidate set in the configured monitoring opportunities in at least one configured control resource (CORESET) according to the corresponding search space configuration. The CORESET may include a PRB set with a duration of 1 to 3 OFDM symbols. A resource unit may be defined as a resource element group (REG) or a REG bundle, and a control channel element (CCE) may be defined within a CORESET, where each CCE includes a set of REG bundles and REGs.

[0022] Under 3GPP R-15, a resource element group may include at least one resource element, which may refer to at least one subcarrier during a symbol, such as an orthogonal frequency division multiplexing (OFDM) symbol or a single carrier frequency division multiplexing (SC-FDMA) symbol. Each REG may contain 12 adjacent subcarriers, equivalent to a physical resource block (PRB). In addition, multiple adjacent REGs in frequency and / or time may be combined together to form a REG bundle. Some functions of the PDCCH, such as interleaved resource mapping and precoder cycle granularity, may be determined based on at least one REG bundle. For example, the UE may assume that the base station uses the same beamforming weights for all REGs / REs of the REG bundle.

[0023] However, if Figure 1 As shown, when the subcarrier spacing is doubled, the link budget is reduced by 3dB due to the proportional reduction of symbol and slot durations as the SCS increases. In addition, the achievable transmission power does not increase when the subcarrier spacing increases. It would be desirable to reuse the same sites for different mmWave radios. However, the link budget difference between SCS 120kHz (typical SCS for FR2) and 960kHz (candidate SCS for above 52.6GHz) can be as high as 9dB (10*log10(960 / 120)). Therefore, it would be desirable to support smooth coverage extension for PDCCH when operating in scenarios above 52.6GHz.

[0024] 3GPP Rel-15 PDCCH discusses the OFDM-based PDCCH design, where different code rates for control channels can be achieved by aggregating different numbers of CCEs. Figure 2 As shown, each REG bundle, which is a building block of CCE, already covers the entire CORESET in the time domain. Therefore, aggregating different numbers of CCEs within the CORESET will not improve the link budget because CCE aggregation does not increase the transmission time spent by the PDCCH. In addition, CCE aggregation under Rel-15 can increase processing gain, but the bandwidth of thermal noise can also be increased, providing improvements in interference rather than any thermal noise. In addition, the NRR15 PDCCH multiplexing solution may not be suitable for mmWave scenarios because there is only a limited demand for DCI multiplexing within narrow beams.

[0025] Certain embodiments described herein may have various benefits and / or advantages to overcome the above-mentioned shortcomings. For example, certain embodiments may provide gains in processing gain due to an extended transmission time interval and a reduction in thermal noise and an improvement in link budget (such as in a thermal noise limited scenario). In addition, various embodiments support single carrier waveforms that promote higher power amplifier (PA) output power. Some embodiments may also support variable aggregation levels and DMRS density, a variable number of parallel CORESETs and / or variable switching opportunities. A control channel may be formed by an aggregation of CCEs. Different code rates for control channels may be achieved by aggregating different numbers of CCEs. Polarization coding may be used for PDCCH, and each CCE carrying PDCCH may carry its own DMRS. QPSK modulation may be used for PDCCH.

[0026] Figure 4 An example of two CORESETs according to some embodiments is illustrated, where the use of multiple CORESETs can separately provide optimization of beam switching gaps in various scenarios. Figure 4 As shown in , CORESET#1 can be used to serve cell edge UEs, since each cell edge UE occupies the entire CORESET, eliminating the need for beam switching gaps between consecutive CCEs. In this way, if beam switching is desired for a PDCCH with AL of 1, one CCE between the PDCCHs can remain unused for beam switching. In addition, compared to CORESET#2a, CORESET#2b can support beam switching gaps after each CCE, and accordingly, the DMRS density ratios in CORESET#1 and CORESET#2a can be 1:3 and 1:4. Alternatively, at least one transmission gap configured for beam switching can be included in the last discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) symbol of each CCE. Various embodiments can also reduce the complexity of the PDCCH subsystem, such as by the absence of an FDM component. Therefore, certain embodiments are directed to improvements in computer-related technologies.

[0027] Figure 6 An example of a signaling diagram illustrating communication between a network entity 610 and a user equipment 620 is illustrated. The network entity 610 may be similar to the network entity 910, and the user equipment 620 may be similar to the user equipment 920, both of which are Fig. 9 Some embodiments described herein are based on a CORESET structure (such as Figure 3The structure shown in FIG. 1 is a structure for a single-carrier based PDCCH. Such a structure can enable a UE to perform blind detection of PDCCHs corresponding to various aggregation levels in the time domain. Different scheduling schemes can enable PDCCH candidates corresponding to CCEs associated with low aggregation levels to be configured in CCEs of high aggregation levels, such as Figure 3 and Figure 4 Alternatively, the CCEs of the CORESET can be distributed in the time domain with low aggregation, such as Figure 5 shown.

[0028] For example, in step 601, NE 610 may send a first physical downlink control channel (PDCCH) configuration to UE 620. The first PDCCH configuration may include a first search space (SS) associated with a first control resource set (CORESET), and the first SS may include at least one PDCCH candidate. In this context, the search space may also be referred to as a search space set or other similar language. A PDCCH candidate set for UE 620 to monitor on a CORESET may be defined according to the PDCCH search space. In various embodiments, UE 620 may also receive a second PDCCH configuration having a search space associated with a second CORESET from NE 610. The second PDCCH configuration may include a second SS associated with a second CORESET, and the second SS may include at least one second PDCCH candidate.

[0029] In some embodiments, the first SS may include at least one PDCCH candidate, wherein each of the at least one PDCCH candidate may include at least one control channel element (CCE), the CCE including at least one of the following: at least one demodulation reference signal (DMRS) part, or at least one downlink control information (DCI) part. In some embodiments, the CCE may include one or more REGs as building blocks, such as (multiple) DMRS REGs and (multiple) DCI REGs. In addition, the CCE may include one or more REG bundles, for example, the CCE may correspond to the REG bundle.

[0030] As an example, at least one CCE in a first CORESET may be associated with a first DMRS density, and at least one CCE in a second CORESET may be associated with a second DMRS density, where the first DMRS and the second DMRS density may be different or the same. In various embodiments, at least one PDCCH candidate of UE 620 may be varied between consecutive monitoring occasions based on at least one predefined hash function. For example, hashing may be applied to mitigate inter-user blocking probability by randomizing the allocation of PDCCH candidates for users within a CORESET over consecutive time slots.

[0031] In various embodiments, the first PDCCH configuration may include a first set of aggregation levels, and the second PDCCH configuration may include a second set of aggregation levels that may be different from the first set of aggregation levels. For example, one of the at least one PDCCH candidates is non-overlapping in the time domain with one of the at least one second PDCCH candidates of the same aggregation level having the same CORESET. Additionally or alternatively, one of the at least one PDCCH candidates is at least partially overlapping in the time domain with one of the at least one second PDCCH candidates of a different aggregation level having the same CORESET. In addition, at least one of the first PDCCH configuration or the second PDCCH configuration may be associated with a single carrier waveform.

[0032] In several embodiments, the first CORESET and the second CORESET may completely overlap in the frequency domain, partially overlap in the frequency domain, or not overlap in the frequency domain. Additionally or alternatively, at least one predefined time resource of the first CORESET or the second CORESET may be reserved for beam switching. Furthermore, at least one predefined time resource of the first CORESET or the second CORESET may be reserved between CCEs, at least one predefined time resource of the first CORESET or the second CORESET may reserve at least one CCE, or at least one CCE or each CCE may cover at least one frequency domain resource element or all frequency domain resource elements of the associated CORESET. The UE 620 may be configured to interpret the precoder granularity as at least one CCE.

[0033] In step 603, UE 620 may detect at least one PDCCH according to the first PDCCH configuration. UE 620 may also detect at least one second PDCCH according to the received second PDCCH configuration. UE 620 may be configured with at least one search space mapped to at least one CORESET and may monitor only in the time domain for PDCCHs associated with different PDCCH aggregation levels. For example, each CCE may cover the entire frequency allocation of the associated CORESET, and there is no FDM between multiple CCEs within a single CORESET.

[0034] In various embodiments, the FDM may be configured with multiple CORESETs, such as where the NE 610 supports at least two digital transceiver units, each of which is configured with a separate CORESET. Figure 4As shown, DMRS density can be optimized by being separated for various ALs. DMRS density can be described by the ratio of DMRS symbols to symbols including both DMRS symbols and DCI symbols. DMRS density can be high, such as 1:2, meaning there are as many DMRS symbols as DCI symbols. DMRS density can also be lower, such as 1:3, 1:4, or 1:5, due to lower overhead caused by DMRS. As an example, a first CORESET (CORESET#1) with a first DMRS density can be configured to serve at least one cell edge UE (AL=16). As shown Figure 4 As shown, the first DMRS density may be high, for example 1:2 or 1:3. In this case, the higher DMRS density in the time domain may result in a defined CCE that is shorter than the CCE associated with the second CORESET and reduce the PDCCH overhead (CORESET#2a, CORESET#2b). Another embodiment may include an equal number of PDCCH and DCI symbols (such as 3) within each CCE and vary the number of DMRS symbols per CCE, such as between 1, 2, and 3. The first CORESET may also be used for UEs with a small AL (e.g. 1), such as for UEs associated with propagation conditions exceeding a predefined threshold or based on at least one other selection metric defined by NE 610. For such UEs, a small number of DCI symbols may be sufficient (e.g., due to the use of a relatively high code rate in the encoding of the DCI bits). As Figure 4 As shown in FIG. 6 for CORESET#1 with AL=1, since DMRS symbols may occupy full symbols and only a small number of DCI symbols may be needed, the PDCCH candidates may have a high DMRS density. The second CORESET may be configured to serve UEs for which propagation conditions exceed a second predefined threshold or based on at least one other selection metric defined by NE 610 (e.g., PDCCH with aggregation level 1, 2, 4, 8, or other values). The second CORESET may have a second DMRS density lower than the first DMRS density, such as 1:4 (for CORESET#2a and #2b) or 1:5.

[0035] In step 605, the UE 620 may transmit and / or receive at least one signal according to at least one detected first PDCCH and / or second PDCCH.

[0036] Figure 7 According to some embodiments, the Fig. 9 An example of a method performed by a user equipment of the user equipment 920 illustrated in FIG. In step 701, the UE may obtain a Fig. 9A network entity of the NE 910 illustrated in FIG. 9 receives a first physical downlink control channel (PDCCH) configuration. The first PDCCH configuration may include a first search space (SS) associated with a first control resource set (CORESET), and the first SS may include at least one PDCCH candidate. In this context, the search space may also be referred to as a search space set or other similar language. A PDCCH candidate set for the UE to monitor on the CORESET may be defined according to the PDCCH search space. In various embodiments, the UE may also receive a second PDCCH configuration having a search space associated with a second CORESET from the NE. Additionally, the UE may detect at least one second PDCCH based on the received second PDCCH configuration. The second PDCCH configuration may include a second SS associated with a second CORESET, and the second SS may include at least one second PDCCH candidate.

[0037] In some embodiments, the first SS may include at least one PDCCH candidate, wherein each of the at least one PDCCH candidate may include at least one control channel element (CCE), the CCE including at least one of the following: at least one demodulation reference signal (DMRS) part, or at least one downlink control information (DCI) part. In some embodiments, the CCE may include one or more REGs as building blocks, such as (multiple) DMRS REGs and (multiple) DCI REGs. In addition, the CCE may include one or more REG bundles, for example, the CCE may correspond to the REG bundle.

[0038] As an example, at least one CCE in a first CORESET may be associated with a first DMRS density, and at least one CCE in a second CORESET may be associated with a second DMRS density, where the first and second DMRS densities may be different or the same. In various embodiments, at least one PDCCH candidate of a UE may vary between consecutive monitoring occasions based on at least one predefined hash function. For example, hashing may be applied to mitigate inter-user blocking probability by randomizing the allocation of PDCCH candidates for users within a CORESET over consecutive time slots.

[0039] In various embodiments, the first PDCCH configuration may include a first set of aggregation levels, and the second PDCCH configuration may include a second set of aggregation levels that may be different from the first set of aggregation levels. For example, one of the at least one PDCCH candidates is non-overlapping in the time domain with one of the at least one second PDCCH candidates of the same aggregation level having the same CORESET. Additionally or alternatively, one of the at least one PDCCH candidates is at least partially overlapping in the time domain with one of the at least one second PDCCH candidates of a different aggregation level having the same CORESET. In addition, at least one of the first PDCCH configuration or the second PDCCH configuration may be associated with a single carrier waveform.

[0040] In several embodiments, the first CORESET and the second CORESET may completely overlap in the frequency domain, partially overlap in the frequency domain, or not overlap in the frequency domain. Additionally or alternatively, at least one predefined time resource of the first CORESET or the second CORESET may be reserved for beam switching. In addition, at least one predefined time resource of the first CORESET or the second CORESET may be reserved between CCEs, at least one predefined time resource of the first CORESET or the second CORESET may reserve at least one CCE, or at least one CCE or each CCE may cover at least one frequency domain resource element or all frequency domain resource elements of the associated CORESET. The UE may be configured to interpret the precoder granularity as at least one CCE.

[0041] In step 703, the UE may detect at least one PDCCH according to the first PDCCH configuration. The UE may also detect at least one second PDCCH according to the received second PDCCH configuration. The UE 620 may be configured with at least one search space mapped to at least one CORESET and may monitor only in the time domain for PDCCHs associated with different PDCCH aggregation levels. For example, each CCE may cover the entire frequency allocation of the associated CORESET, and there is no FDM between multiple CCEs within a single CORESET.

[0042] In various embodiments, the FDM may be configured with multiple CORESETs, such as where the NE 610 supports at least two digital transceiver units, each of which is configured with a separate CORESET. Figure 4As shown, DMRS density can be optimized by separating various ALs. DMRS density can be described by the ratio of DMRS symbols to symbols including both DMRS symbols and DCI symbols. DMRS density can be high, such as 1:2, meaning there are as many DMRS symbols as DCI symbols. DMRS density can also be lower, such as 1:3, 1:4, or 1:5, due to lower overhead caused by DMRS. As an example, a first CORESET (CORESET#1) with a first DMRS density can be configured to serve at least one cell edge UE (AL=16). As shown Figure 4 As shown, the first DMRS density may be high, e.g., 1:2 or 1:3. In this case, the higher DMRS density in the time domain may result in a defined CCE that is shorter than the CCE associated with the second CORESET and reduce PDCCH overhead (CORESET#2a, CORESET#2b). Another embodiment may include an equal number of PDCCH DCI symbols (such as 3) within each CCE and vary the number of DMRS symbols per CCE, such as between 1, 2, and 3. The first CORESET may also be used for UEs with a small AL (e.g., 1), such as for UEs associated with propagation conditions exceeding a predefined threshold or based on at least one other selection metric defined by NE 610. For such UEs, a small number of DCI symbols may be sufficient (e.g., due to the use of a relatively high code rate in the encoding of the DCI bits). As Figure 4 As shown in FIG. 6 for CORESET#1 with AL=1, since DMRS symbols can occupy full symbols and only a small number of DCI symbols may be needed, the PDCCH candidates can have a high DMRS density. The second CORESET can be configured to serve UEs whose propagation conditions exceed a second predefined threshold or based on at least one other selection metric defined by NE610 (e.g., PDCCH with aggregation level 1, 2, 4, 8 or other values). The second CORESET can have a second DMRS density lower than the first DMRS density, such as 1:4 (for CORESET#2a and #2b) or 1:5.

[0043] In step 705, the UE may send and / or receive at least one signal according to at least one detected first PDCCH and / or second PDCCH.

[0044] Figure 8 The diagram illustrates a method according to some embodiments of the present invention. Fig. 9 In step 801, the NE may send a message to a user equipment (such as Fig. 9920) sends a first physical downlink control channel (PDCCH) configuration. The first PDCCH configuration may include a first search space (SS) associated with a first control resource set (CORESET), and the first SS may include at least one PDCCH candidate. In this context, the search space may also be referred to as a search space set or other similar language. The PDCCH candidate set for the UE to monitor on the CORESET may be defined according to the PDCCH search space. In various embodiments, the NE may also send a second PDCCH configuration having a search space associated with a second CORESET to the UE. The second PDCCH configuration may include a second SS associated with the second CORESET, and the second SS may include at least one second PDCCH candidate.

[0045] In some embodiments, the first SS may include at least one PDCCH candidate, wherein each of the at least one PDCCH candidate may include at least one control channel element (CCE), the CCE including at least one DMRS part of at least one demodulation reference signal (DMRS) part, or at least one downlink control information (DCI) part. In some embodiments, the CCE may include one or more REGs as building blocks, such as (multiple) DMRS REGs and (multiple) DCI REGs. In addition, the CCE may include one or more REG bundles, for example, the CCE may correspond to the REG.

[0046] As an example, at least one CCE in a first CORESET may be associated with a first DMRS density, and at least one CCE in a second CORESET may be associated with a second DMRS density, wherein the first DMRS and the second DMRS density may be different or the same. In various embodiments, at least one PDCCH candidate of a UE may be varied between consecutive monitoring occasions based on at least one predefined hash function. For example, hashing may be applied to mitigate inter-user blocking probability by randomizing the allocation of PDCCH candidates for users within a CORESET over consecutive time slots.

[0047] In various embodiments, the first PDCCH configuration may include a first set of aggregation levels, and the second PDCCH configuration may include a second set of aggregation levels that may be different from the first set of aggregation levels. For example, one of the at least one PDCCH candidates is non-overlapping in the time domain with one of the at least one second PDCCH candidates of the same aggregation level having the same CORESET. Additionally or alternatively, one of the at least one PDCCH candidates is at least partially overlapping in the time domain with one of the at least one second PDCCH candidates of a different aggregation level having the same CORESET. In addition, at least one of the first PDCCH configuration or the second PDCCH configuration may be associated with a single carrier waveform.

[0048] In several embodiments, the first CORESET and the second CORESET may completely overlap in the frequency domain, partially overlap in the frequency domain, or not overlap in the frequency domain. Additionally or alternatively, at least one predefined time resource of the first CORESET or the second CORESET may be reserved for beam switching. In addition, at least one predefined time resource of the first CORESET or the second CORESET may be reserved between CCEs, at least one predefined time resource of the first CORESET or the second CORESET may reserve at least one CCE, or at least one CCE or each CCE may cover at least one frequency domain resource element or all frequency domain resource elements of the associated CORESET.

[0049] In step 803, the NE may send at least one PDCCH according to the first PDCCH configuration. The NE may also detect at least one second PDCCH according to the received second PDCCH configuration. The UE may be configured with at least one search space mapped to at least one CORESET and may monitor only in the time domain for PDCCHs associated with different PDCCH aggregation levels. For example, each CCE may cover the entire frequency allocation of the associated CORESET, and there is no FDM between multiple CCEs within a single CORESET.

[0050] In various embodiments, the FDM may be configured with multiple CORESETs, such as in the case where the NE supports at least two digital transceiver units, each of which is configured with a separate CORESET. Figure 4As shown, DMRS density can be optimized by being separated for various ALs. DMRS density can be described by the ratio of DMRS symbols to symbols including both DMRS symbols and DCI symbols. DMRS density can be high, such as 1:2, meaning there are as many DMRS symbols as DCI symbols. DMRS density can also be lower, such as 1:3, 1:4, or 1:5, due to lower overhead caused by DMRS. As an example, a first CORESET (CORESET#1) with a first DMRS density can be configured to serve at least one cell edge UE (AL=16). As shown Figure 4 As shown, the first DMRS density may be high, for example 1:2 or 1:3. In this case, the higher DMRS density in the time domain may result in a defined CCE that is shorter than the CCE associated with the second CORESET and reduce the PDCCH overhead (CORESET#2a, CORESET#2b). Another embodiment may include an equal number of PDCCH DCI symbols (such as 3) within each CCE and vary the number of DMRS symbols per CCE, such as between 1, 2, and 3. The first CORESET may also be used for UEs with a small AL (e.g. 1), such as for UEs associated with propagation conditions exceeding a predefined threshold or based on at least one other selection metric defined by NE610. For such UEs, a small number of DCI symbols may be sufficient (e.g., due to the use of a relatively high code rate in the encoding of the DCI bits). As Figure 4 As shown in FIG. 6 for CORESET#1 with AL=1, since DMRS symbols may occupy full symbols and only a small number of DCI symbols may be needed, the PDCCH candidates may have a high DMRS density. The second CORESET may be configured to serve UEs for which propagation conditions exceed a second predefined threshold or based on at least one other selection metric defined by NE 610 (e.g., PDCCH with aggregation level 1, 2, 4, 8, or other values). The second CORESET may have a second DMRS density lower than the first DMRS density, such as 1:4 (for CORESET#2a and #2b) or 1:5.

[0051] In step 805 , the NE may send and / or receive at least one signal according to at least one detected first PDCCH and / or second PDCCH.

[0052] Fig. 9 An example of a system according to some embodiments is illustrated.In one embodiment, the system may include a plurality of devices, such as, for example, a network entity 910 and a user equipment 920 .

[0053] The network entity 910 may be one or more of a base station, such as an evolved Node B (eNB) or a next generation Node B (gNB), a next generation radio access network (NG RAN), a serving gateway, a server, a relay node, a distributed unit portion such as an integrated access and backhaul (IAB) node, and / or any other access node or combination thereof.

[0054] User device 920 may include one or more of a mobile device (such as a mobile phone, a smart phone, a personal digital assistant (PDA), a tablet computer or portable media player, a digital camera, a pocket camcorder), a video game console, a navigation unit (such as a global positioning system (GPS) device), a desktop or laptop computer, a single location device (such as a sensor or a smart meter), a relay node (such as the mobile terminal portion of an IAB node), or any combination thereof.

[0055] In some embodiments, the network entity 910 and the user equipment 920 may be part of a relay node. Multiple relays may be linked together to form a multi-hop relay network in a relay deployment. In addition, a Citizens Band Radio Service (CBRS) device (CBSD) may include one or more service cells, such as the network entity 910 and the user equipment 920.

[0056] One or more of these devices may include at least one processor, indicated as 911 and 921, respectively. At least one memory may be provided in one or more of the devices indicated as 912 and 922. The memory may be fixed or removable. The memory may include computer program instructions or computer code contained therein. The processors 911 and 921 and the memories 912 and 922, or a subset thereof, may be configured to provide Figures 1 to 8 Components corresponding to the various blocks. Although not shown, the device may also include positioning hardware, such as a global positioning system (GPS) or micro-electromechanical system (MEMS) hardware, which can be used to determine the location of the device. Other sensors are also allowed and can be included to determine location, altitude, direction, etc., such as a barometer, compass, etc.

[0057] like Fig. 9 As shown, transceivers 913 and 923 may be provided, and one or more devices may also include at least one antenna, illustrated as 914 and 924, respectively. The device may have many antennas, such as an antenna array configured for multiple-input multiple-output (MIMO) communication, or multiple antennas for multiple radio access technologies. For example, other configurations of these devices may be provided.

[0058] The transceivers 913 and 923 may be transmitters, receivers, or both transmitters and receivers, or may be configured as units or devices for both transmission and reception.

[0059] Processors 911 and 921 may be implemented by any computing or data processing device, such as a central processing unit (CPU), an application specific integrated circuit (ASIC), or the like. The processor may be implemented as a single controller, or multiple controllers or processors.

[0060] Memories 912 and 922 can independently be any suitable storage device, such as a non-transient computer readable medium. A hard disk drive (HDD), random access memory (RAM), flash memory or other suitable memory can be used. The memory can be combined on a single integrated circuit as a processor, or can be separated from one or more processors. In addition, the computer program instructions stored in the memory and that can be processed by the processor can be any suitable form of computer program code, for example, a compiled or interpreted computer program written in any suitable programming language. The memory can be removable or non-removable.

[0061] The memory and the computer program instructions may be configured to work together with a processor for a particular device. Figures 1 to 8 ). Thus, in some embodiments, a non-transitory computer-readable medium may be encoded with computer instructions that, when executed in hardware, perform a process such as one of the processes described herein. Alternatively, some embodiments may be implemented entirely in hardware.

[0062] In some embodiments, the apparatus may include a Figures 1 to 8 Circuitry for any process or function shown. For example, the circuitry may be a hardware circuit implementation only, such as an analog and / or digital circuitry. In another example, the circuitry may be a combination of hardware circuitry and software, such as a combination of analog and / or (multiple) digital hardware circuitry with software or firmware, and / or any portion of (multiple) hardware processors with software (including (multiple) digital signal processors), software and at least one memory, which work together to enable the device to perform various processes or functions. In yet another example, the circuitry may be (multiple) hardware circuitry and / or (multiple) processors, such as (multiple) microprocessors or a portion of (multiple) microprocessors, which includes software, such as firmware for operation. When the operation of the hardware is not required, the software in the circuitry may not be present.

[0063] The features, structures or characteristics of certain embodiments described throughout this specification may be combined in any suitable manner in one or more embodiments. For example, the use of the phrases "certain embodiments", "some embodiments", "other embodiments" or other similar language throughout this specification refers to the fact that a particular feature, structure or characteristic described in conjunction with an embodiment may be included in at least one embodiment of the present invention. Therefore, the appearance of the phrases "in certain embodiments", "in some embodiments", "in other embodiments" or other similar language throughout this specification does not necessarily refer to the same embodiment group, and the described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner.

[0064] Those skilled in the art with ordinary skill will readily appreciate that certain embodiments discussed above may be practiced with steps in a different order and / or with hardware elements in configurations different from those disclosed. Therefore, certain modifications, variations, and alternative configurations will be apparent to those skilled in the art while remaining within the spirit and scope of the present invention. Therefore, in order to determine the limits and scope of the present invention, reference should be made to the appended claims.

[0065] Partial Glossary

[0066] 3GPP Third Generation Partnership Project

[0067] AL Aggregation Level

[0068] CCE Control Channel Element

[0069] CORESET Control Resource Set

[0070] CP-OFDM Cyclic Prefix Orthogonal Frequency Division Multiplexing

[0071] DCI Downlink Control Information

[0072] DFT Discrete Fourier Transform

[0073] DFT-S-OFDM Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing

[0074] DL Downlink

[0075] DMRS Demodulation Reference Signal

[0076] FDM Frequency Division Multiplexing

[0077] FFT Fast Fourier Transform

[0078] eMBB Enhanced Mobile Broadband

[0079] eNB Evolved Node B

[0080] EPC Evolved Packet Core

[0081] gNB Next Generation eNB

[0082] GPS Global Positioning System

[0083] GS Ground Station

[0084] IFFT Inverse Fast Fourier Transform

[0085] LTE Long Term Evolution

[0086] MCS Modulation and Coding Scheme

[0087] MIMO Multiple Input Multiple Output

[0088] MME Mobility Management Entity

[0089] MTC Machine Type Communication

[0090] NR New Radio

[0091] OFDM Orthogonal Frequency Division Multiplexing

[0092] PA Power Amplifier

[0093] PAPR Peak to Average Power Ratio

[0094] RAN Radio Access Network

[0095] RSRP Reference Signal Received Power

[0096] SFN System Frame Number

[0097] SFTD System Frame Timing Difference

[0098] SSB Synchronous Signal Block

[0099] SS Search Space

[0100] TA Timing Advance

[0101] TATD Timing Advance Timing Difference

[0102] UE User Equipment

[0103] UL Uplink

[0104] URLLC Ultra-Reliable Low Latency Communications

[0105] WLAN Wireless Local Area Network

[0106] According to a first embodiment, a method may include receiving, by a user equipment, a first physical downlink control channel (PDCCH) configuration from a network entity. The method may also include detecting, by the user equipment, at least one PDCCH according to the first PDCCH configuration. The method may also include sending and / or receiving, by the user equipment, at least one signal according to the detected at least one PDCCH.

[0107] In a variation, the first PDCCH configuration may include a first search space (SS) associated with a first control resource set (CORESET).

[0108] In another variation, the first SS may include at least one PDCCH candidate.

[0109] In another variant, each of the at least one PDCCH candidate may include at least one control channel element (CCE) including one of: at least one demodulation reference signal (DMRS) portion or at least one first downlink control information (DCI) portion.

[0110] In another variation, at least one CCE may include a time division multiplexing relationship with at least another CCE.

[0111] In a variant, the method may further include receiving, by the user equipment, a second PDCCH configuration from the network entity.

[0112] In a variation, the second PDCCH configuration may include a search space associated with a second CORESET from the network entity.

[0113] In yet another variant, the method may further include detecting, by the user equipment, at least one second PDCCH according to the received second PDCCH configuration.

[0114] In a variation, the second PDCCH configuration may include a second SS associated with a second CORESET.

[0115] In another variation, the second SS may include at least one second PDCCH candidate.

[0116] In another variant, each PDCCH candidate of the at least one second PDCCH candidate may include at least one CCE including at least one of: at least one DMRS part or at least one DCI part.

[0117] In another variant, the at least one CCE may be at least one second CCE.

[0118] In another variation, the at least one DMRS portion may be at least one second DMRS portion.

[0119] In another variant, the at least one DCI part may be at least one second DCI part.

[0120] In another variant, at least one CCE of at least one PDCCH candidate may include a time division multiplexing relationship with at least one CCE of at least one second PDCCH candidate.

[0121] In a variant, one of the at least one PDCCH candidate is non-overlapping in the time domain with one of the at least one second PDCCH candidate of the same aggregation level of the same CORESET.

[0122] In a variant, one of the at least one PDCCH candidate at least partially overlaps with one of the at least one second PDCCH candidate of a different aggregation level of the same CORESET in the time domain.

[0123] In a variation, at least one of the first PDCCH configuration or the second PDCCH configuration may be associated with a single carrier waveform.

[0124] In a variation, at least one CCE in the first CORESET may be associated with a first DMRS density, and at least one CCE in the second CORESET may be associated with a second DMRS density.

[0125] In variations, the first DMRS and second DMRS densities may be different or the same.

[0126] In a variation, the first PDCCH configuration may include a first set of aggregation levels, and the second PDCCH configuration may include a second set of aggregation levels that may be different from the first set of aggregation levels.

[0127] In variations, the first CORESET and the second CORESET may completely overlap in the frequency domain, partially overlap in the frequency domain, or not overlap in the frequency domain.

[0128] In a variant, the first CORESET and the second CORESET may be associated with different transceivers and / or different transmit beams at the base station.

[0129] In a variant, at least one predefined time resource of the first CORESET or the second CORESET may be reserved for beam switching.

[0130] In a variant, at least one predefined time resource of the first CORESET or the second CORESET may be reserved between CCEs.

[0131] In a variant, at least one predefined time resource of the first CORESET or the second CORESET may be reserved at at least one CCE.

[0132] In a variant, at least one or each CCE may cover at least one frequency-domain resource element or all frequency-domain resource elements of the associated CORESET.

[0133] In a variant, the user equipment may be configured to interpret the precoder granularity as CCEs.

[0134] In a variation, at least one PDCCH candidate of the UE may be changed between consecutive monitoring occasions based on a predefined hash function.

[0135] According to a second embodiment, the method may include sending, by a network entity, a first physical downlink control channel (PDCCH) configuration to a user equipment. The method may also include sending, by the network entity, at least one first PDCCH to the user equipment according to the first PDCCH configuration. The method may also include sending and / or receiving, by the network entity, at least one signal according to the at least one first PDCCH.

[0136] In a variation, the first PDCCH configuration may include a first search space (SS) associated with a first control resource set (CORESET).

[0137] In another variation, the first SS may include at least one PDCCH candidate.

[0138] In another variant, each of the at least one PDCCH candidate may include at least one control channel element (CCE) including at least one demodulation reference signal (DMRS) portion or at least one first downlink control information (DCI) portion.

[0139] In another variation, at least one CCE may include a time division multiplexing relationship with at least another CCE.

[0140] In a variant, the method may further include sending, by the network entity, a second PDCCH configuration.

[0141] In a variation, the second PDCCH configuration may include a search space associated with a second CORESET to the user equipment.

[0142] In a variation, the second PDCCH configuration may include a second SS associated with a second CORESET.

[0143] In another variation, the second SS may include at least one second PDCCH candidate.

[0144] In another variant, each second PDCCH candidate of the at least one second PDCCH candidate may include at least one second CCE including at least one of at least one DMRS part or at least one DCI part.

[0145] In a variant, the at least one DMRS part may be at least one second DMRS part.The at least one DCI part may be at least one second DCI part.

[0146] In another variant, the at least one second DCI part may include a second time division multiplexing relationship with the at least one second DCI part.

[0147] In a variant, one of the at least one PDCCH candidate is non-overlapping in the time domain with one of the at least one second PDCCH candidate of the same aggregation level of the same CORESET.

[0148] In a variant, one of the at least one PDCCH candidate at least partially overlaps with one of the at least one second PDCCH candidate of a different aggregation level of the same CORESET in the time domain.

[0149] In a variation, at least one of the first PDCCH configuration or the second PDCCH configuration may be associated with a single carrier waveform.

[0150] In a variation, at least one CCE in the first CORESET may be associated with a first DMRS density, and at least one CCE in the second CORESET may be associated with a second DMRS density.

[0151] In variations, the first and second DMRS densities may be different or the same.

[0152] In a variation, the first PDCCH configuration may include a first set of aggregation levels, and the second PDCCH configuration may include a second set of aggregation levels that may be different from the first set of aggregation levels.

[0153] In variations, the first CORESET and the second CORESET may completely overlap in the frequency domain, partially overlap in the frequency domain, or not overlap in the frequency domain.

[0154] In a variant, the first CORESET and the second CORESET may be associated with different transceivers and / or different transmit beams at the base station.

[0155] In a variant, at least one predefined time resource of the first CORESET or the second CORESET may be reserved for beam switching.

[0156] In a variant, at least one predefined time resource of the first CORESET or the second CORESET may be reserved between CCEs.

[0157] In a variant, at least one predefined time resource of the first CORESET or the second CORESET may be reserved at at least one CCE.

[0158] In a variant, at least one or each CCE may cover at least one frequency-domain resource element or all frequency-domain resource elements of the associated CORESET.

[0159] In a variant, the user equipment may be configured to interpret the precoder granularity as CCEs.

[0160] In a variation, at least one PDCCH candidate of the UE may be changed between consecutive monitoring occasions based on a predefined hash function.

[0161] According to the third and fourth embodiments, the device may include at least one processor and at least one memory and computer program code. The at least one memory and computer program code may be configured to, together with the at least one processor, cause the device to at least perform the method according to the first embodiment, the second embodiment and any variants thereof.

[0162] According to the fifth and sixth embodiments, an apparatus may include means for performing the method according to the first embodiment, the second embodiment, and any variants thereof.

[0163] According to the seventh and eighth embodiments, a computer program product may encode instructions for executing a process including the method according to the first embodiment, the second embodiment, and any variants thereof.

[0164] According to the ninth and tenth embodiments, a non-transitory computer-readable medium may encode instructions that, when executed in hardware, perform a process including the method according to the first embodiment, the second embodiment, and any variations thereof.

[0165] According to the eleventh and twelfth embodiments, the computer program code may include instructions for executing the method according to the first embodiment, the second embodiment and any variants thereof.

[0166] According to the thirteenth and fourteenth embodiments, an apparatus may include a circuit system configured to perform a process including the method according to the first embodiment, the second embodiment, and any variations thereof.

Claims

1. A wireless communication device, comprising: at least one processor, and at least one memory and computer program code, The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to at least: receiving a first physical downlink control channel configuration from a network entity, wherein the first physical downlink control channel configuration comprises a first search space associated with a first set of control resources, the first search space comprising at least one physical downlink control channel candidate; receiving a second physical downlink control channel configuration from the network entity, wherein the second physical downlink control channel configuration comprises a second search space associated with a second set of control resources, the second search space comprises at least one second physical downlink control channel candidate, one of the at least one physical downlink control channel candidate at least partially overlaps in the time domain with one of the at least one second physical downlink control channel candidate having a different aggregation level of the same set of control resources, at least one of the first physical downlink control channel configuration or the second physical downlink control channel configuration being associated with a single carrier waveform; detecting at least one physical downlink control channel based on the first physical downlink control channel configuration and the second physical downlink control channel configuration; as well as At least one signal is sent and / or received based on the detected at least one physical downlink control channel.

2. An apparatus according to claim 1, wherein each of the at least one physical downlink control channel candidate comprises at least one control channel element, and the at least one control channel element comprises at least one of the following: at least one demodulation reference signal part, or at least one first downlink control information part.

3. The apparatus of claim 2, wherein the at least one control channel element comprises a time division multiplexing relationship with at least another control channel element.

4. The apparatus of claim 1, wherein the second physical downlink control channel configuration comprises a search space associated with a second set of control resources from the network entity.

5. An apparatus according to claim 1 or claim 4, wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the apparatus to at least: detect at least one second physical downlink control channel based on the received second physical downlink control channel configuration.

6. An apparatus according to claim 1, wherein each of the at least one second physical downlink control channel candidate comprises at least one control channel element, and the at least one control channel element comprises at least one of the following: at least one demodulation reference signal part, or at least one downlink control information part.

7. The apparatus of claim 6, wherein the at least one control channel element comprises at least one second control channel element.

8. An apparatus according to claim 6 or claim 7, wherein the at least one demodulation reference signal portion comprises at least one second demodulation reference signal portion.

9. The apparatus of claim 6, wherein the at least one downlink control information portion comprises at least one second downlink control information portion.

10. The apparatus of claim 6, wherein the at least one control channel element of at least one physical downlink control channel candidate comprises a time division multiplexing relationship with the at least one control channel element of the at least one second physical downlink control channel candidate.

11. The apparatus according to claim 1, wherein one of the at least one physical downlink control channel candidates and one of the at least one second physical downlink control channel candidates having the same aggregation level of the same control resource set are non-overlapping in the time domain.

12. The apparatus of claim 4, wherein at least one control channel element in the first control resource set is associated with a first demodulation reference signal density, and at least one control channel element in the second control resource set is associated with a second demodulation reference signal density. 13 . The apparatus of claim 12 , wherein the first demodulation reference signal and the second demodulation reference signal densities are different or the same.

14. The apparatus of claim 1, wherein the first physical downlink control channel configuration comprises a first set of aggregation levels and the second physical downlink control channel configuration comprises a second set of aggregation levels different from the first set of aggregation levels.

15. The apparatus of claim 4, wherein the first set of control resources and the second set of control resources are at least one of: completely overlapping in the frequency domain, partially overlapping in the frequency domain, or non-overlapping in the frequency domain.

16. The apparatus of claim 4, wherein the first set of control resources and the second set of control resources are associated with at least one of different transceivers or different transmit beams at a network element.

17. The apparatus of claim 4, wherein at least one predefined time resource of the first control resource set or the second control resource set is reserved for beam switching.

18. The apparatus of claim 4, wherein at least one predefined time resource of the first set of control resources or the second set of control resources is reserved between control channel elements.

19. The apparatus of claim 4, wherein at least one predefined time resource of the first set of control resources or the second set of control resources is reserved at at least one control channel element.

20. The apparatus of claim 4, wherein at least one control channel element or each control channel element covers at least one frequency domain resource element or all frequency domain resource elements of an associated control resource set.

21. The apparatus of claim 1, wherein the apparatus is configured to interpret precoder granularity as a control channel element.

22. The apparatus of claim 1, wherein at least one physical downlink control channel candidate of the apparatus changes between consecutive monitoring occasions based on a predefined hash function.

23. A wireless communication device, comprising: at least one processor, and at least one memory and computer program code, The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to at least: sending a first physical downlink control channel configuration to a user equipment, wherein the first physical downlink control channel configuration comprises a first search space associated with a first control resource set, the first search space comprising at least one physical downlink control channel candidate; sending a second physical downlink control channel configuration to the user equipment, wherein the second physical downlink control channel configuration comprises a second search space associated with a second control resource set, the second search space comprises at least one second physical downlink control channel candidate, one of the at least one physical downlink control channel candidate at least partially overlaps with one of the at least one second physical downlink control channel candidate having a different aggregation level of the same control resource set in a time domain, and at least one of the first physical downlink control channel configuration or the second physical downlink control channel configuration is associated with a single carrier waveform; sending at least one first physical downlink control channel to the user equipment based on the first physical downlink control channel configuration and the second physical downlink control channel configuration; as well as At least one signal is sent and / or received based on the at least one first physical downlink control channel.

24. An apparatus according to claim 23, wherein each of the at least one physical downlink control channel candidate comprises at least one control channel element, and the at least one control channel element comprises at least one of the following: at least one demodulation reference signal part, or at least one first downlink control information part.

25. The apparatus of claim 24, wherein the at least one control channel element comprises a time division multiplexing relationship with at least another control channel element.

26. The apparatus according to claim 23, wherein the second physical downlink control channel configuration comprises a search space associated with a second control resource set for the user equipment.

27. An apparatus according to claim 23, wherein each of the at least one second physical downlink control channel candidate comprises at least one second control channel element, and the at least one second control channel element comprises at least one of the following: at least one demodulation reference signal part, or at least one downlink control information part.

28. The apparatus of claim 27, wherein the at least one demodulation reference signal portion comprises at least one second demodulation reference signal portion, and the at least one downlink control information portion comprises at least one second downlink control information portion.

29. The apparatus of claim 28, wherein the at least one second downlink control information portion comprises a second time division multiplexing relationship with at least one second downlink control information portion.

30. An apparatus according to any one of claims 23 to 29, wherein one of the at least one physical downlink control channel candidates is non-overlapping in the time domain with one of the at least one second physical downlink control channel candidates of the same aggregation level having the same control resource set.

31. A method of wireless communication, comprising: receiving, at a user equipment, a first physical downlink control channel configuration from a network entity, wherein the first physical downlink control channel configuration comprises a first search space associated with a first set of control resources, the first search space comprising at least one physical downlink control channel candidate; receiving, at the user equipment, a second physical downlink control channel configuration from the network entity, wherein the second physical downlink control channel configuration comprises a second search space associated with a second set of control resources, the second search space comprising at least one second physical downlink control channel candidate, one of the at least one physical downlink control channel candidate at least partially overlapping in a time domain with one of the at least one second physical downlink control channel candidate having a different aggregation level of the same set of control resources, at least one of the first physical downlink control channel configuration or the second physical downlink control channel configuration being associated with a single carrier waveform; detecting, at the user equipment, at least one physical downlink control channel based on the first physical downlink control channel configuration and the second physical downlink control channel configuration; as well as At least one signal is sent and / or received by the user equipment based on the detected at least one physical downlink control channel.

32. A method of wireless communication, comprising: sending, from a network entity to a user equipment, a first physical downlink control channel configuration, wherein the first physical downlink control channel configuration comprises a first search space associated with a first set of control resources, the first search space comprising at least one physical downlink control channel candidate; sending, from the network entity to the user equipment, a second physical downlink control channel configuration, wherein the second physical downlink control channel configuration comprises a second search space associated with a second control resource set, the second search space comprises at least one second physical downlink control channel candidate, one of the at least one physical downlink control channel candidate at least partially overlaps in the time domain with one of the at least one second physical downlink control channel candidate having a different aggregation level of the same control resource set, at least one of the first physical downlink control channel configuration or the second physical downlink control channel configuration being associated with a single carrier waveform; sending, from the network entity, at least one first physical downlink control channel to the user equipment based on the first physical downlink control channel configuration and the second physical downlink control channel configuration; as well as At least one signal is sent and / or received by the network entity based on the at least one first physical downlink control channel.

33. A wireless communication apparatus comprising means for performing the following operations: receiving a first physical downlink control channel configuration from a network entity, wherein the first physical downlink control channel configuration comprises a first search space associated with a first set of control resources, the first search space comprising at least one physical downlink control channel candidate; receiving a second physical downlink control channel configuration from the network entity, wherein the second physical downlink control channel configuration comprises a second search space associated with a second set of control resources, the second search space comprises at least one second physical downlink control channel candidate, one of the at least one physical downlink control channel candidate at least partially overlaps in the time domain with one of the at least one second physical downlink control channel candidate having a different aggregation level of the same set of control resources, at least one of the first physical downlink control channel configuration or the second physical downlink control channel configuration being associated with a single carrier waveform; detecting at least one physical downlink control channel based on the first physical downlink control channel configuration and the second physical downlink control channel configuration; as well as At least one signal is sent and / or received based on the detected at least one physical downlink control channel.

34. An apparatus for wireless communication, comprising means for performing the following operations: sending a first physical downlink control channel configuration to a user equipment, wherein the first physical downlink control channel configuration comprises a first search space associated with a first control resource set, the first search space comprising at least one physical downlink control channel candidate; sending a second physical downlink control channel configuration to the user equipment, wherein the second physical downlink control channel configuration comprises a second search space associated with a second control resource set, the second search space comprises at least one second physical downlink control channel candidate, one of the at least one physical downlink control channel candidate at least partially overlaps with one of the at least one second physical downlink control channel candidate having a different aggregation level of the same control resource set in a time domain, and at least one of the first physical downlink control channel configuration or the second physical downlink control channel configuration is associated with a single carrier waveform; Sending at least one first physical downlink control channel to the user equipment based on the first physical downlink control channel configuration and the second physical downlink control channel configuration; as well as At least one signal is sent and / or received based on the at least one first physical downlink control channel.

35. A non-transitory computer readable medium comprising program instructions stored thereon for executing the method according to claim 31 or claim 32.

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