CN113545144A - Method and device for transmitting and receiving enhanced physical downlink control channel - Google Patents

Abstract

A method and apparatus for transmitting and receiving an enhanced Physical Downlink Control Channel (PDCCH). The first control resource set (CORESET) is repeated in a PDCCH transmission by transmitting a first copy of first Downlink Control Information (DCI) in a first PDCCH candidate allocated to the first DCI and transmitting a second copy of the first DCI in a second PDCCH candidate allocated to a second CORESET. The first CORESET and the second CORESET are associated with a first set of search spaces. When the receiving device receives and acquires the repeated first DCI and the related configuration of the first DCI, the receiving device acquires the first DCI from the first copy and the second copy of the first DCI by using the related configuration of the first DCI.

Description

Method and device for transmitting and receiving enhanced physical downlink control channel

Background of the present application

1. Field of the invention

The present application relates to the field of communications systems, and in particular, to a method and an apparatus for transmitting and receiving an enhanced PDCCH.

2. Description of the related Art

As formulated by The 3rd Generation Partnership Project (3 GPP), a Physical Downlink Control Channel (PDCCH) currently designed can only support transmission of The PDCCH from a single transmission reception node (TRP), without solving The PDCCH reliability problem.

The TRP having the best channel condition may be selected and the PDCCH may be transmitted to a User Equipment (UE). The channel condition between the UE and one TRP may change dynamically, but the configuration of the search space for monitoring the PDCCH is semi-static and cannot closely track the change of the radio channel. Reconfiguring the search space for monitoring the PDCCH requires time and results in longer delay and more signaling overhead.

Therefore, a transmission apparatus and method of an enhanced PDCCH are needed.

Disclosure of Invention

The present application aims to provide a method and an apparatus for transmitting and receiving an enhanced PDCCH, which can improve reliability.

In a first aspect of the present application, there is provided a method of enhancing PDCCH transmission, the method being executable by an apparatus and comprising: the transmission of a first Downlink Control Information (DCI) is repeated by transmitting a first copy of the first DCI in a first PDCCH candidate allocated to a first set of control resources (CORESET) and transmitting a second copy of the first DCI in a second PDCCH candidate allocated to a second CORESET, wherein the first CORESET and the second CORESET are associated with a first set of search spaces.

In a second aspect of the present application, there is provided a method of enhanced PDCCH reception, the method being executable by an apparatus and comprising: receiving a repetition of a first DCI and a configuration of the repetition of the first DCI; according to the configuration, acquiring a first copy of first DCI in first PDCCH candidates distributed to a first CORESET; obtaining a second copy of the first DCI in a second PDCCH candidate assigned to a second CORESET according to the configuration, wherein the first CORESET and the second CORESET are associated with a first search space set; and obtaining the first DCI from the first copy and the second copy of the first DCI.

In a third aspect of the present application, an apparatus for enhanced PDCCH reception is provided that may be configured by an apparatus comprising a transceiver and a processor to perform the transceiver receiving a repetition of a first DCI and the repetition of the first DCI. And the processor acquires a first copy of the first DCI in first PDCCH candidates allocated to a first CORESET according to the configuration, and acquires a second copy of the first DCI in second PDCCH candidates allocated to a second CORESET according to the configuration. The first CORESET and the second CORESET are associated with a first set of search spaces. The processor obtains the first DCI from the first copy and the second copy of the first DCI.

Brief description of the drawings

In order to more clearly illustrate the embodiments of this application or the related art, the following drawings will be described in the embodiments and briefly introduced as follows. It should be apparent that the drawings represent only some of the embodiments of the present application and that other drawings may be derived by those skilled in the art from these drawings without making any preconditions.

Fig. 1 shows a block diagram of a transmitter for Downlink (DL) or Uplink (UL) transmission.

Fig. 2 shows a block diagram of a receiver for receiving DL or UL transmissions.

Fig. 3 is a block diagram of a User Equipment (UE) and a base station for enhanced PDCCH transmission and reception according to an embodiment of the present application.

Fig. 4 shows a flowchart of a method for enhancing PDCCH transmission according to an embodiment of the present application.

Fig. 5 shows a block diagram of a system for enhanced transmission and reception of PDCCH according to an embodiment of the present application.

Fig. 6 shows a flowchart of a method for enhancing PDCCH transmission according to an embodiment of the present application.

Fig. 7 shows a flowchart of a method of enhanced PDCCH reception according to an embodiment of the application.

Fig. 8 shows a flowchart of a method of enhanced PDCCH reception according to an embodiment of the application.

Fig. 9 shows a block diagram of a system for wireless communication according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in detail below with reference to the accompanying drawings, wherein the embodiments are described in detail with reference to the accompanying drawings. In particular, the terminology used in the embodiments of the present application is for the purpose of describing certain embodiments only and is not intended to be limiting of the present application.

Fifth generation (5G) wireless systems are typically multi-beam based systems using the frequency range 2(FR2) between 24.25GHz to 52.6GHz, where a Base Station (BS) and/or a User Equipment (UE) employ multiplexed transmit (Tx) and receive (Rx) analog beams in an attempt to reduce the amount of path loss in the high frequency band. In a high frequency band system such as the mmWave system, the BS and the UE are configured with a large number of antennas, and thus a high gain beamforming technique can be used to overcome a large amount of path loss and signal blocking. Due to hardware limitations and cost, the BS and the UE may be equipped with only a limited number of transmission and reception units (TXRUs). Therefore, a hybrid beamforming mechanism may be employed in the BS and the UE. In order to obtain the best link quality between the BS and the UE, the BS and the UE need to align the analog beam directions for a specific downlink or uplink transmission. For downlink transmission, the BS and the UE need to find an optimal pair of BS Tx beam and UE Rx beam, and for uplink transmission, the BS and the UE need to find an optimal pair of UE Tx beam and BS Rx beam.

For communication between the BS and one UE, the BS and the UE need to determine which of the Tx beam and the Rx beam is to be used. When one UE moves, beams used by the BS and the UE to communicate may change. In support of this multi-beam based operation, the following functions are defined in the 3GPP 5G specification.

In an operational aspect associated with beam measurement and reporting, in this function, the UE may measure one or more Tx beams of the BS, and then the UE may select the best Tx beam and report its selection to the BS. By measuring the Tx beams of the BS, the UE may also measure one or more different Rx beams and then select the best Rx beam for one particular Tx beam of the BS. In this function, the gNB may also measure one or more Tx beams of the UE and then select the best UE Tx beam for uplink transmission. To support measurement of Tx beams of the BS, the BS may transmit a plurality of Reference Signal (RS) resources and then configure the UE to measure the RS resources. The UE may then report an index of one or more selected RS resources selected based on some measured metrics, such as Layer 1reference signal received power (L1-RSRP). To support measurement of the UE's Tx beams for uplink transmissions, the BS may configure the UE to transmit one or more uplink RS resources, e.g., Sounding Reference Signal (SRS) resources, which the BS may then measure. Based on measuring L1-RSRP such as RS resources, the BS can know clearly which Tx beam of the UE is most suitable for uplink transmission.

In association with the beam indication, for downlink transmission, the BS may indicate to the UE which Tx beam of the BS is used for transmission, so that the UE may receive downlink transmission using the appropriate Rx beam. For Physical Downlink Control Channel (PDCCH) transmission, the BS may indicate an Identification (ID) of one BS Tx beam to the UE. For physical downlink discovery channel (PSDCH) transmission, the BS may use Downlink Control Information (DCI) in the PDCCH to indicate an ID of one Tx beam for transmitting a corresponding Physical Downlink Shared Channel (PDSCH). For uplink transmission from the UE, the BS may also indicate to the UE Tx beam to use. For example, for Physical Uplink Control Channel (PUCCH) transmission, the UE uses a Tx beam indicated by the BS through one configuration of spatial relationship information. For SRS transmission, the UE uses the Tx beam indicated by the BS through one configuration of spatial relationship information. For Physical Uplink Shared Channel (PUSCH) transmission, the UE uses a Tx beam indicated by one information element in the scheduling DCI.

The operational aspect associated with beam switching, the BS uses this function to switch Tx beams for downlink or uplink transmissions. This functionality is advantageous in situations where the Tx beam currently used for transmission is out of date due to e.g. movement of the UE. When the BS finds that the Tx beam currently used for downlink transmission is not good, or the BS finds that another Tx beam is better than the current Tx beam, the BS may send signaling to the UE to inform the UE of the change of its Tx beam. Similarly, the BS may switch to one uplink Tx beam of the UE, which is used to transmit some uplink transmissions.

In a communication system such as a New Radio (NR) system, the DL signal may include control signaling for transmitting DCI through a PDCCH, a data signal for transmitting an information packet through a PDSCH, and some types of reference signals. The DCI may indicate information how to transmit the PDSCH, including, for example, resource allocation and transmission parameters of the PDSCH. The BS may transmit one or more types of reference signals for different purposes, including demodulation reference symbols (DM-RS), which are transmitted with the PDSCH and with which the UE may demodulate the PDSCH; a channel state information reference signal (CSI-RS) with which the UE can measure a BS Tx beam or CSI of a downlink channel between the BS and the UE; and a phase tracking reference signal (PT-RS), which is also transmitted with the PDSCH and which the UE can use to estimate phase noise caused by defects in Radio Frequency (RF) parts in the transmitter and receiver and then compensate for the PDSCH when decoding it. In NR, DL resource allocation of PDCCH, PDSCH and reference signals is performed in units of Orthogonal Frequency Division Multiplexing (OFDM) symbols and a set of Physical Resource Blocks (PRBs). Each PRB contains several Resource Elements (REs), for example 12 REs, in the frequency domain. The transmission Bandwidth (BW) of a downlink transmission consists of frequency resource units called Resource Blocks (RBs), each RB consisting of a few sub-carriers or REs, e.g., 12 sub-carriers or 12 REs.

The UL signal transmitted by the UE to the BS may include a data signal conveying a data packet through a PUSCH; an uplink control signal transmitting UL Control Information (UCI), which may be transmitted on a PUSCH or a PUCCH; and a UL reference signal. The UCI may carry a Scheduling Request (SR), which is used by the UE to request uplink transmission resources, and carry feedback of hybrid automatic repeat request acknowledgement (HARQ-ACK) for PDSCH transmission, or carry a Channel State Information (CSI) report. The UE may send one or more types of uplink reference signals, including DM-RS, for different purposes, which are sent with the PUSCH transmission and which the BS may use to demodulate the PUSCH; PT-RS, which is also sent with PUSCH transmission and which can be used by the BS to estimate phase noise caused by imperfections in the RF part, and which the BS can then compensate for when decoding PUSCH; and an SRS signal with which the BS measures one or more UE Tx beams or CSI of an uplink channel between the UE and the BS. Similarly, UL resource allocation for PUSCH, PUCCH, and UL reference signals is also performed in symbol units and a set of PRBs.

The transmission interval of a DL or UL channel/signal is called a slot, and each slot contains a few symbols, e.g., 14 symbols, in the time domain. In the NR system, one slot may have a duration of 1, 0.5, 0.25, or 0.123 msec and subcarrier intervals of 15kHz, 30kHz, 60kHz, and 120kHz, respectively. The NR system supports flexible digital numerology, and in one embodiment, the appropriate OFDM subcarrier spacing may be selected according to development scenarios and service requirements. In NR systems, DL and UL transmissions may use different numerical propositions.

Fig. 1 shows a block diagram of a transmitter for DL or UL transmission. The embodiment of the transmitter block shown in fig. 1 is for illustration only. Other embodiments may be used without departing from the scope of the present application. The information bits 001 may be first encoded by an encoder 002, such as a Low Density Parity Check (LDPC) encoder or a polar encoder, and then modulated by a modulator 003. This modulation may be, for example, binary phase-shift keying (BPSK), Quadrature Amplitude Modulation (QAM) 4, QAM 16, QAM 64, or QAM 256. Then, a serial to parallel (S/P) converter 004 may generate a plurality of modulation symbols in parallel, which are then input to an RE mapper and precoder 005. The RE mapper and precoder 005 may map modulation symbols into selected REs and then apply some precoders to the modulation symbols on the BW resources allocated to DL or UL transmissions. Then, in 006, the modulated symbols are subjected to an Inverse Fast Fourier Transform (IFFT), which is output and then serialized by a parallel to serial (P/S) converter 007. Then, the signal is transmitted to a Tx unit 008, which includes, for example, a digital-to-analog (d/a) converter, a radio frequency converter, a filter, power amplification, a Tx antenna element, and is transmitted.

Fig. 2 shows a block diagram of a receiver for receiving DL or UL transmissions. The embodiment of the receiver block shown in fig. 2 is for illustration only. Other embodiments may be used without departing from the scope of the present application. The received signal 011 first passes through an Rx unit 012, which includes, for example, an Rx antenna element, a low noise power amplifier, a radio frequency converter, and a filter. And, its output passes P/S013, and then applied to FFT 014. After conversion into the frequency domain, the RE demapping 015 extracts a useful signal according to the resource allocation of DL or UL transmission. Subsequently, the demodulation 016 demodulates the data symbols using the channel estimates calculated based on the DM-RS, and then the decoder 017 such as an LDPC decoder or a polar decoder decodes the demodulated data to output information bits 018.

In release 15 of the NR 3GPP specification, a UE may be configured with a CORESET, in which a set of time-frequency resources for PDCCH transmission is configured. For one CORESET, a UE may be configured with: a CORESET ID, an initial value of PDCCH DM-RS scrambling, a number of OFDM symbols used by the CORESET, which defines a time-frequency resource of the CORESET, and the set of resource blocks, which defines a frequency-domain resource of the CORESET. The gNB may also transmit a configuration indicator (TCI) -state (state) through a parameter of a higher layer, configure an antenna quasi-co-location (QCL) for the CORESET, and the UE may use it to monitor the DM-RS for the PDCCH. For monitoring PDCCH, the gNB may configure the UE with a set of search spaces. In one set of search spaces, the gNB may configure time-frequency locations where the UE should monitor PDCCH transmissions. In the configuration of the search space set, the gNB may also configure the number of PDCCH candidates and DCI formats of the candidates that the UE should be required to expect. Through the configuration of the search space set, the gNB may provide the following information to the UE for monitoring the PDCCH:

an index of a slot in which the PDCCH may be transmitted;

time-frequency resources in a time slot in which PDCCH may be transmitted;

the number of PDCCH candidates per CCE aggregation level; and

DCI formats, which may be transmitted on PDCCH, e.g., DCI format 0_0 and DCI format 0_1, or DCI format 1_0 and DCI format 1_ 1.

Fig. 3 shows a User Equipment (UE) 10 and a base station 20 for transmission and reception of enhanced PDCCH according to embodiments of the present application in some embodiments. The UE10 may include a processor 11, a memory 12, and a transceiver 13. The base station 20 may include a processor 21, a memory 22, and a transceiver 23. The processor 11 or 21 may be configured to implement the proposed functions, procedures and/or methods described in this specification. The radio interface protocol layers may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives radio signals.

The processor 11 or 21 may comprise an application-specific integrated circuit (ASIC), other chipset, logic circuit and/or data processing device. The memory 12 or 22 may include read-only memory (ROM), Random Access Memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The transceiver 13 or 23 may include a baseband circuit and a Radio Frequency (RF) circuit for processing a radio frequency signal. When the embodiments are implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. These modules may be stored in memory 12 or 22 and executed by processor 11 or 21. The memory 12 or 22 may be implemented within the processor 11 or 21 or external to the processor 11 or 21, in which case those elements communicatively coupled to the processor 11 or 21 in various ways are known in the art.

Referring to fig. 4, in some embodiments, the processor 21 is configured to perform a method 600 for enhanced PDCCH transmission. Processor 21 receives a configuration of a particular DCI format and a configuration of DCI repetition (block 601). Processor 21 obtains a first DCI for transmission via a PDCCH (block 602) and determines a DCI format of the first DCI (block 603). When the DCI format of the first DCI conforms to the particular DCI format, processor 21 performs repeated transmission of the first DCI through transceiver 23 (block 604). When the DCI format of the first DCI does not match the particular DCI format, processor 21 transmits the first DCI through transceiver 23 without DCI repeat transmission (block 605). At block 604, processor 21 repeats the transmission of the first DCI through transceiver 23 by sending a first copy of the first DCI in a first PDCCH candidate assigned to a first CORESET and sending a second copy of the first DCI in a second PDCCH candidate assigned to a second CORESET. The first CORESET and the second CORESET are associated with a first set of search spaces.

In the present application, a method for transmitting a PDCCH with enhanced reliability is provided. In this application, a "beam" may correspond to an RS resource, which may be a CSI-RS resource, an SRS resource, a synchronization signal/physical broadcast channel (SS/PBCH) block, or any other type of RS.

In one embodiment, a UE, such as UE10, may be configured with one set of search spaces associated with two or more sets of control resources. PDCCH candidates in those different control resource sets that are associated with the same search space are associated. The gNB, e.g., BS 20, may repeat the transmission of DCI in those concatenated PDCCH candidates that are configured in different CORESETs of the same search space. On the UE side, during PDCCH detection, the UE may be pre-configured with information of one same DCI that is repeated among linked PDCCH candidates in different CORESETs configured in the search space. The technical advantage of this proposal is that the multiple TRP system can support the transmit diversity of DCI transmission. We can assign different CORESETs associated with the same search space to different TRPs in multiple TRP systems. Those TRPs may send the same copy of one DCI in different CORESETs, and the UE may combine the signals received from multiple TRPs. When the link between one TRP and the UE is blocked, the UE can still successfully detect the PDCCH based on the signal received from the other TRP.

Fig. 5 shows a schematic diagram of an example of a system for enhanced PDCCH transmission and reception according to an embodiment of the present application.

As shown in FIG. 5, the multi-TRP system 100 has two TRPs, i.e., TRP-A101 and TRP-B102. TRP-A101 and TRP-B102 may be separate base stations, each of TRP-A101 and TRP-B102 being an embodiment of BS 20. Alternatively, TRP-A101 and TRP-B102 may be separate radio units but share a common base station, which is an embodiment of BS 20. UE103 is an embodiment of UE 10. These base stations may further be connected to a physical core network and/or core network slice instance of a telecommunications operator. One example of the UE103 may include the UE 10. DCI X140 is an example of the first DCI.

In one embodiment of the present application, system 100 may configure one set of search spaces 120 for UE103 to monitor PDCCH transmissions from TRP-A101 and TRP-B102. System 100 may configure two CORESETs for UE103, namely CORESET-1121 and CORESET-2122. System 100 may be a BS or a group of BSs capable of NR transmission. The two CORESET are associated with a set of search spaces 120 provided to the UE103 for PDCCH monitoring. TRP-a 101 and TRP-B102 may send the same DCI X140 on both CORESETs 121 and 122 configured in search space set 120. From the UE perspective, the UE may be pre-configured with information to repeatedly transmit the same DCI, which is transmitted in two copies of DCI X140 in PDCCH candidate 131 of CORESET 121 and PDCCH candidate 132 of CORESET 122, and which PDCCH candidate 131 and the DCI are concatenated together by higher layer configuration. UE103 may decode PDCCH candidates 131 and 132 separately, and if the DCI format of DCI X140 is decoded correctly from either PDCCH candidate, UE103 may declare that the DCI was decoded successfully. UE103 may also combine the received signals from both PDCCH candidates 131 and 132 and then attempt to decode the DCI format of DCI X140 based on the combined signals.

In a first approach, a UE, such as UE103, may be configured with a first core set and a second core set, such as core sets 121 and 122. For each of the CORESETs, the following parameters may be configured to the UE:

a CORESET index p for identifying CORESET;

a DM-RS scrambling sequence initial value used for generating a reference signal sequence for DM-RS of CORESET;

the number of symbols contained in the CORESET, which defines the length of the time-domain resources allocated to the CORESET;

a frequency domain resource allocation to CORESET, which is a set of resource blocks allocated to CORESET in the frequency domain;

a method of mapping a Control Channel Element (CCE) to a Resource Element Group (REG); and

quasi-co-location (QCL) configuration of CORESET.

Each CORESET may be configured with a Transmission Configuration Indicator (TCI) -state (state) that configures one or more reference signal resources to provide references to various quasi co-located types of DM-RS of the CORESET.

The UE may be configured with a first set of search spaces. Both the first and second CORESET are associated with the first set of search spaces. For the first set of search spaces, the UE may be configured with one or more of:

an Identifier (ID) of the first set of search spaces, which identifies the first set of search spaces;

an association between the first set of search spaces, the first CORESET, and the second CORESET;

configuration of PDCCH monitoring, comprising: k is a radical of_sPDCCH monitoring periodicity and o of a slot_sPDCCH monitoring offset of a time slot; a PDCCH monitoring pattern within one slot indicating first symbol(s) of CORESET within one slot for PDCCH monitoring; t is_s<k_sThe duration of the time slot; and the number of PDCCH candidates per CCE aggregation level L

Wherein L may be 1,2, 4, 8 and/or 16;

DCI format that the UE should use to monitor PDCCH candidates in the first set of search spaces; and

applicability of PDCCH monitoring configuration.

With respect to DCI formats, for example, the UE may be configured to monitor DCI format 0_0 and DCI format 0_1 in the first set of search spaces. Alternatively, for example, the UE may be configured to monitor DCI format 1_0 and DCI format 1_0 in the first set of search spaces. At least one of a plurality of DCI formats may be defined as the specific DCI format. The DCI repeated configuration may include at least some of the above-described configurations.

Regarding applicability of the PDCCH monitoring configuration, the UE may be pre-set with information of the PDCCH monitoring configuration and DCI format configurations configured in a first search space set, the first search space set being applied to both a first core set and a second core set, the first core set and the second core set being associated with the first search space set. The DCI repeated configuration may include at least some of the above-described configurations. The UE may obtain the DCI repeated configuration through explicit or implicit signaling from the BS.

For the first search space, in a given slot n, the UE may be preset with information of PDCCH candidates concatenated together for DCI transmission in the first core set and the second core set starting from the same first symbol in the slot n. The UE may be preset with information that the same DCI is transmitted in concatenated PDCCH candidates. In particular, for a first search space associated with a first CORESET and a second CORESET, at a given time slot of an active DL bandwidth part (BWP)

For a first CORESET and a second CORESET having the same first symbol, the PDCCH candidates in the first CORESET allocated to the aggregation level L

And PDCCH candidates in a second CORESET configured to aggregation level L

Concatenated together for PDCCH detection and monitoring. The UE may be pre-provisioned with a candidate for PDCCH

DCI formats carried in CCE in first CORESET and for PDCCH candidates

Information of DCI format carried in CCR in second CORESET, the PDCCH candidate

A DCI of the same content, e.g., DCI x 140, is transmitted.

Fig. 6 shows an example of a gNB 500 that transmits DCI 501 with DCI repeatability in the PDCCH of the first search space. Embodiments of gNB 500 may include one or more of TRP 101 and TRP 102 in system 100. DCI 501, e.g., DCI X140, is first appended with CRC bits in stage 502, which a recipient UE, e.g., UE103, can use to detect PDCCH transmission errors. The CRC is then scrambled in stage 503. The RNTI 531 of the UE is used to scramble the CRC part of the DCI 501. The DCI 501 is then encoded in stage 504, for example by polarity encoding. After encoding, the gNB 500 may perform rate matching on the encoded bits of the DCI 501 for resources in the first and second CORESET, respectively. As shown in fig. 6, the rate matching is performed on the coded bits of the DCI 501 for the resources in the first CORESET in stage 511, and the rate matching is performed on the coded bits of the DCI 501 for the resources in the second CORESET in stage 521. The rate matched output bits are then scrambled with the sequence configured in each CORESET at stages 512 and 522. The scrambled output bits are modulated into QPSK symbols at stages 513 and 523. Finally, the gNB 500 may map the modulated symbols and corresponding DM-RS signals to resources in a first CORESET at stage 514 and to resources in a second CORESET at stage 524.

In the first approach, concatenated PDCCH candidates that send repeated DCI in those two CORESET have the same starting symbol and also the same aggregation level. The advantage of the first approach is the simplicity of configuration and implementation on the UE side. However, one disadvantage of the first approach is limited flexibility. In the first approach, DCI repetitions transmitted by different TRPs must be transmitted at the same CCE aggregation level. In some cases, different TRPs may employ different aggregation levels to transmit the same DCI due to different channel qualities and conditions between the TRP and the UE.

In a second approach, the UE may be configured with a first core set and a second core set. For each of the CORESETs, the following parameters may be configured to the UE:

a CORESET index for identifying one CORESET;

a DM-RS scrambling sequence initial value used for generating a reference signal sequence for DM-RS of CORESET;

the number of symbols contained in the CORESET, which defines the length of the time-domain resources allocated to the CORESET;

a frequency domain resource allocation to CORESET, which defines a set of resource blocks;

a method of mapping CCEs to Resource Element Groups (REGs); and

QCL configuration of CORESET, where each CORESET may be configured with one TCI-state that configures one or more reference signal resources to provide references for various quasi co-located types of DM-RS of CORESET.

Referring to fig. 7, in some embodiments, processor 11 is configured to perform a method 610 for enhanced PDCCH transmission. Processor 11 obtains a repetitive configuration of the first DCI, e.g., via transceiver 13 (block 611). The repetitive configuration of the first DCI includes a configuration of a specific DCI format. Processor 11 receives a PDCCH transmission that includes a repetition of the first DCI received by transceiver 13 (block 612) and determines a DCI format of the first DCI (block 613). When the DCI format of the first DCI conforms to the particular DCI format, processor 11 obtains the first DCI from the first and second copies of the first DCI (block 614). When the DCI format of the first DCI does not correspond to the particular DCI format, processor 11 obtains the first DCI without DCI repetition (block 615).

Referring to FIG. 8, processor 11 is configured to perform a method 620 including blocks 621-624, which reveals more details of block 614. Processor 11 obtains a first copy of a first DCI from a first PDCCH candidate assigned to a first control resource set (core set) according to the configuration (block 622); according to the configuration, a second copy of the first DCI in the second PDCCH candidate assigned to the second CORESET is obtained (block 623). The first CORESET and the second CORESET are associated with a first set of search spaces. Processor 11 receives the repetition of the first DCI (block 624), and obtains the first DCI from the first copy and the second copy of the first DCI (block 625).

The UE may be configured with a first set of search spaces, and both the first and second CORESET are associated with the first set of search spaces. In the configuration of the first set of search spaces, the UE may be configured with (1) a PDCCH monitoring pattern in one slot, i.e., first symbol(s) of CORESET within one slot, for PDCCH monitoring in a first CORESET and PDCCH monitoring in a second CORESET, respectively; (2) the number of PDCCH candidates for one aggregation level of CORESET. The UE may also be configured with a concatenation between PDCCH candidates in the first CORESET and PDCCH candidates in the second CORESET to monitor for PDCCH repetitions. In one embodiment of the invention, for a first set of search spaces, the UE may be configured with one or more of:

an Identifier (ID) of the first set of search spaces, which is used to identify the first set of search spaces;

an association between the first set of search spaces, the first CORESET, and the second CORESET;

slot position for monitoring PDDCH, which can pass through k_sPDCCH monitoring periodicity and o of a slot_sA PDCCH monitoring offset of the slot;

·T_s<k_sa duration of the time slot indicating that a first set of search spaces exists for the plurality of time slots; and

an association between a first CORESET and a second CORESET within a time slot.

For the first CORESET, the UE may be configured with:

PDCCH monitoring pattern within one slot indicating the first symbol(s) of the first core set within one slot; and

the number of PDCCH candidates per CCE aggregation level L of the first CORESET, which may be, for example, 1,2, 4, 8 and/or 16.

For the second CORESET, the UE may be configured with:

PDCCH monitoring pattern within one slot indicating the first symbol(s) of the second core set within one slot; and

the number of PDCCH candidates per CCE aggregation level L of the second CORESET, which may be, for example, 1,2, 4, 8 and/or 16.

For the first set of search spaces, the UE may be further configured with an association between the first core set and the second core set within one time slot. For example, the association between the first core set and the second core set means that the PDCCH monitoring indicated by the first symbol a of the first core set is associated with the PDCCH monitoring indicated by the first symbol b of the second core set. The DCI repeated configuration may include at least some of the above-described configurations.

In one embodiment of the invention, one first symbol indicates a first core set and one first symbol indicates a second core set within one slot. The PDCCH monitoring in the first CORESET and the PDCCH monitoring in the second CORESET in the same slot are thus associated through the first symbol. The DCI repeated configuration may include at least some of the above-described configurations.

In one embodiment of the invention, more than one first symbol may be configured for a first core set within a time slot, and one or more than one first symbol may be configured for a second core set within a time slot. Each first symbol of the second core set may be associated with one first symbol of the first core set within the same time slot. The UE may be pre-provisioned with the PDCCH monitoring information in the first and second CORESET concatenated through the associated first symbol. The DCI repeated configuration may include at least some of the above-described configurations.

In one embodiment of the invention, one or more starting symbol positions of a first core set within a time slot are configured, and one or more starting symbol positions of a second core set within a time slot are configured. Within one time slot, an association between one PDCCH monitoring occasion of a first CORESET and one PDCCH monitoring occasion of a second CORESET may be configured based on the one or more starting symbol positions. The DCI repeated configuration may include at least some of the above-described configurations.

For example, two PDCCH monitoring occasions may be configured for a first CORESET in one time slot and one PDCCH monitoring occasion for a second CORESET in one time slot. The first PDCCH monitoring occasion of the second CORESET may be cross-associated with the second PDCCH monitoring occasion of the first CORESET. This association of PDCCH monitoring occasions for the first and second CORESET may be used by the gNB to transmit repeated DCI, and may be used by the UE to determine where the repeated DCI is transmitted.

In one embodiment of the present invention, the first symbol(s) of the first core set within one slot is configured by a bitmap a0 a1 … aN, where each bit indicates one starting symbol of the PDCCH monitoring occasion of the first core set. Also, the first symbol(s) of the second CORESET within one slot are configured by another bitmap b0 b1 … bN, where each bit indicates one starting symbol of the PDCCH monitoring occasion of the second CORESET. The UE may be configured with a third bitmap c0 c1.. cN that is used to indicate an association between PDCCH monitoring for the second CORESET and PDCCH monitoring for the first CORESET.

For the first CORESET, taking N-13 as aN example, a0 a1 … aN-10000001000000 and b0 b1 … bN-01000000000000. Two PDCCH monitors in one time slot are configured to a first CORESET, and one PDCCH monitor in one time slot is configured to a second CORESET. The UE may also be configured with c0 c1 … cN-10, which means that PDCCH monitoring for the second core set is associated with PDCCH monitoring for the first core set within one slot.

The UE may be configured with a concatenation between PDCCH candidates in PDCCH monitoring of a first CORESET and a second CORESET. The UE may be pre-provisioned with information to repeat the same DCI among the concatenated PDCCH candidates in the associated PDCCH monitoring of the first and second CORESET. The gNB may repeat one DCI transmission among two concatenated PDCCH candidates for the first and second CORESET. Also, the UE may be preset with information that one identical DCI may be repeated in concatenated PDCCH candidates of the first and second CORESET. The DCI repeated configuration may include at least some of the above-described configurations.

In the first example, the UE may be previously provided with information that PDCCH candidates in the first and second CORESET are concatenated with each other at the same CCE aggregation level. The UE may be pre-provisioned with information that one PDCCH candidate in a first CORESET at a CCE aggregation level L is concatenated with one PDCCH candidate in a second CORESET at a CCE aggregation level L, where L may be 1,2, 4, 8, or 16. In the example of CCE aggregation level L, the number of PDCCH candidates in the first CORESET is set to

The number of PDCCH candidates in the second CORESET is set to

Then, for CCE aggregation level L, PDCCH candidate m in the second CORESET of the first set of search spaces_sWith the PDCCH candidate m in the first CORESET of the first set of search spaces_sAre connected together, wherein

Is an on input

And

of which a function of the minimum value is output. In another example, for a CCE aggregation level L, the UE may be pre-provisioned with PDCCH candidates m in a second CORESET of the first search space set_sWith PDCCH candidates in a first CORESET of a first set of search spaces

Concatenated information wherein

Is composed of

As a function of (c). And Δ is a PDCCH candidate index offset, which may take a value, for example, 0,1, -1,2, -2,3, -3, or other integer. The DCI repeated configuration may include at least some of the above-described configurations.

In one embodiment of the invention, the first CORESET may be configured as a primary CORESET in the first set of search spaces. While a second CORESET may be configured as a secondary CORESET in the first set of search spaces for providing DCI repetition for DCI transmission in the first CORESET. The number of PDCCH monitoring occasions for the second CORESET within a time slot should not be greater than the number of PDCCH monitoring occasions for the first CORESET. The number of PDCCH candidates for the second core set should not be greater than the number of PDCCH candidates for the first core set.

In a second example, one PDCCH candidate for a first core set at aggregation level L1 may be concatenated with one PDCCH candidate for a second core set at aggregation level L2. Here, the CCE aggregation level L1 and the CCE aggregation level L2 may be the same or different. An advantage of this example is that different TRPs can flexibly use different CCE aggregation levels to transmit the same DCI. The path loss between transmission paths from a UE to different TRPs is usually different, so these TRPs can use different CCE levels to send the same DCI to the UE. The DCI repeated configuration may include at least some of the above-described configurations.

In a third example, in the configuration of the first set of search spaces, the UE is configured with the first CORESET at CCE aggregation level L1

PDCCH candidates, and the UE is configured with in the second CORESET at CCE aggregation level L2

And (4) PDCCH candidate. In the configuration of the first search space set for the UE, one PDCCH candidate of the CCE aggregation level L1 of the first CORESET is concatenated with one PDCCH candidate of the CCE aggregation level L2 of the second CORESET, which is also configured to the UE. Then, the UE may be pre-set with PDCCH candidate m of CCE aggregation level L2 in the second CORESET_sPDCCH candidate m with CCE aggregation level L1 in the first CORESET in the first search space set_sThe concatenated information. In another example, the UE may be pre-set with PDCCH candidate m of CCE aggregation level L2 in the second CORESET_sPDCCH candidate with CCE aggregation level L1 in the first CORESET in the first search space set

The concatenated information. The DCI repeated configuration may include at least some of the above-described configurations.

Table one shows an example of a computer executable program for configuring a set of search spaces associated with two CORESET for DCI replication according to the present application.

Watch 1

In one approach, the UE may be requested to preset information that only one specific DCI format is repeated in the first and second CORESET associated with the first set of search spaces. This approach is beneficial to reduce the complexity of UE implementation. Another technical motivation for this approach is that DCI repetition generally facilitates ultra-reliable low-latency communication (URLLC) services, and PDSCH transmissions of such URLLC services may be scheduled through specific DCI formats. Therefore, for DCI repetition, it is sufficient for the UE to monitor only a specific DCI format.

In the configuration of the first set of search spaces, the UE may be configured with a higher layer parameter indicating a DCI format without DCI repetition, at which point the UE should expect decoding in PDCCH candidates in the first CORESET, and may be configured with another higher layer parameter indicating a DCI format with DCI repetition, at which point the UE may expect decoding in concatenated PDCCH candidates in the first CORESET and the second CORESET.

The multi-TRP system according to an embodiment of the present invention may repeat transmission of one same DCI from a plurality of TRPs to a single UE. Transmission diversity of PDCCH from multiple TRPs is achieved, thus improving the reliability of PDCCH transmission. An important use case of a multi-TRP system according to an embodiment of the present invention is a URLLC service with strict requirements on the performance of both PDCCH and PDSCH channels.

Fig. 9 is a block diagram of a system 700 for wireless communication in accordance with an embodiment of the present application. The embodiments described herein may be implemented into the system using any suitably configured hardware and/or software. For example, each of UE10 and UE103 may be implemented as system 700. Fig. 9 shows a system 700, the system 700 including a Radio Frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled to each other at least as shown.

The application circuitry 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors (e.g., a graphics processor and an application processor). The processor may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems to run on the system.

Baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may comprise a baseband processor. The baseband circuitry may handle various wireless control functions that enable communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, and the like. In some embodiments, the baseband circuitry may provide communications compatible with one or more wireless technologies. For example, in some embodiments, the baseband circuitry may support communication with an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and/or other Wireless Metropolitan Area Networks (WMANs), Wireless Local Area Networks (WLANs), Wireless Personal Area Networks (WPANs). Embodiments in which the baseband circuitry is configured to support wireless communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry. In various embodiments, baseband circuitry 720 may include circuitry for operating with signals that are not strictly considered to be in baseband frequencies. For example, in some embodiments, the baseband circuitry may include circuitry for operating with signals having an intermediate frequency between the baseband frequency and the radio frequency.

RF circuitry 710 may use the modulated electromagnetic radiation to enable communication with a wireless network through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, and the like to facilitate communication with the wireless network. In various embodiments, RF circuitry 710 may include circuitry for operating with signals that are not strictly considered to be at radio frequencies. For example, in some embodiments, the RF circuitry may include circuitry for operating with signals having an intermediate frequency between a baseband frequency and a radio frequency.

In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be implemented in whole or in part in one or more of RF circuitry, baseband circuitry, and/or application circuitry. As used herein, "circuitry" may refer to, may be part of, or include the following: an Application Specific Integrated Circuit (ASIC), an electronic circuit executing one or more software or firmware programs, a processor and/or memory (shared, dedicated, or group), a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the electronics circuitry may be implemented in, or functions associated with, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, application circuitry, and/or memory/storage devices may be implemented together on a system on a chip (SOC).

Memory/storage 740 may be used to load and store data and/or instructions, for example, for a system. The memory/storage of one embodiment may comprise any combination of suitable volatile memory (e.g., Dynamic Random Access Memory (DRAM)) and/or non-volatile memory (e.g., flash memory). In various embodiments, the I/O interface 780 may include one or more user interfaces designed to enable a user to interact with the system and/or a peripheral component interface designed to enable a peripheral component to interact with the system. The user interface may include, but is not limited to, a physical keyboard or keypad, a touchpad, a speaker, a microphone, and the like. The peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a Universal Serial Bus (USB) port, an audio jack, and a power interface.

In various embodiments, the sensor 770 may include one or more sensing devices for determining environmental conditions and/or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyroscope sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of or interact with baseband circuitry and/or RF circuitry to communicate with components of a positioning network, such as Global Positioning System (GPS) satellites. In various embodiments, display 750 may include displays such as liquid crystal displays and touch screen displays. In various embodiments, system 700 may be a mobile computing device, such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, and the like. In various embodiments, the system may have more or fewer components and/or different architectures. Where appropriate, the methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

In the embodiment of the application, a method and a device for enhancing PDCCH transmission, which can improve reliability, are provided. The embodiments of the present application are a combination of techniques/procedures that may be employed in 3GPP specifications to develop end products.

It will be understood by those of ordinary skill in the art that each of the units, algorithms, and steps described and disclosed in the embodiments of the present disclosure is implemented using electronic hardware or a combination of software and electronic hardware for a computer. Whether these functions are implemented in hardware or software depends on the application and design requirements of the solution. Skilled artisans may implement the functionality in varying ways for each particular application, and such implementation decisions should not be interpreted as causing a departure from the scope of the present application. It will be appreciated by those skilled in the art that reference may be made to the operation of the systems, devices and units described in the above embodiments as the operation of the systems, devices and units described above is substantially the same. For convenience of description and brevity, these operations will not be described in detail.

It should be understood that the systems, devices, and methods disclosed in the embodiments of the present disclosure may be implemented in other ways. The embodiments described above are merely illustrative. The division of cells is based on logical functions only, while other divisions exist when implemented. Multiple units or components may be combined or may be integrated into another system. Some features may also be omitted or skipped. On the other hand, the mutual coupling, direct coupling or communication coupling shown or discussed may be an indirect coupling or an electrical, mechanical or other form of communication coupling through some interfaces, devices or units.

The elements described as separate components may or may not be physically separate. The displayed units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be used according to the purpose of the embodiments. In addition, functional units in the embodiments may be integrated into one processing unit, may be physically independent, or may be integrated into one processing unit by two or more units.

If the software functional units are implemented and sold or used as a stand-alone product, they may be stored in a computer readable storage medium. Based on such understanding, the technical solutions proposed in the present application can be implemented in the form of software products in nature or in part. Alternatively, a part of the technical solution that is advantageous to the prior art may be implemented in the form of a software product. The software product in the computer is stored in a storage medium and includes a plurality of commands for a computing device (e.g., a personal computer, server, or network device) to execute all or part of the steps disclosed in the embodiments of the present disclosure. The storage medium includes a USB disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a floppy disk, or other medium capable of storing program code.

While the application has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the application is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims (20)

1. A method of enhancing Physical Downlink Control Channel (PDCCH) transmission, the method being executable by an apparatus and comprising:

the transmission of a first Downlink Control Information (DCI) is repeated by transmitting a first copy of the first DCI in a first PDCCH candidate allocated to a first set of control resources (CORESET) and transmitting a second copy of the first DCI in a second PDCCH candidate allocated to a second CORESET, wherein the first CORESET and the second CORESET are associated with a first set of search spaces.

2. The method of claim 1, further comprising:

receiving a configuration of a specific DCI format;

determining a DCI format of the first DCI; and

performing a repeated transmission of the first DCI when the DCI format of the first DCI conforms to the specific DCI format.

3. The method of claim 1, further comprising being configured with a first association between a first and a second copy of the first DCI, wherein the first association represents that the first copy of a first Control Channel Element (CCE) aggregation level used to detect the PDCCH candidate in the first CORESET transmitted by a first transmission and reception node (TRP) is associated with the second copy of a second CCE aggregation level used to detect the second PDCCH candidate in the second CORESET transmitted by a second TRP.

4. The method of any of claims 1 and 3, further comprising being configured with a second association between the first PDCCH candidate and the second PDCCH candidate, wherein the second association represents a first CCE aggregation level L₁Is associated with a second CCE aggregation level L₂The second PDCCH candidate of (1), and the L₁Is identical to the L₂。

5. The method of claim 4, wherein the second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe first PDCCH candidate index is the CCE aggregation level L in the first CORESET₁PDCCH candidate m in_sThe second association represents the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate m in_s，

Is composed of

And the delta is a PDCCH candidate index offset.

6. The method of claim 4, wherein the second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe first PDCCH candidate index is the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

The second association represents the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

Is composed of

And the delta is a PDCCH candidate index offset.

7. The method of any of claims 1, 3, and 4, further comprising being configured with a third association between the first PDCCH candidate and the second PDCCH candidate, wherein the third association represents a first Control Channel Element (CCE) aggregation level L₁Is associated with a second CCE aggregation level L₂The second PDCCH candidate of (1), and the L₁Is different from the L₂。

8. The method of claim 7, wherein the second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe third PDCCH candidate index is the CCE aggregation level L in the first CORESET₁PDCCH candidate m in_sThe third association represents the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate m in_s，

Is composed of

And the delta is a PDCCH candidate index offset.

9. The method of claim 7, wherein the second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe first PDCCH candidate index is the index of the first CORESETThe CCE aggregation level L₁PDCCH candidate in (1)

The third association represents the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

Is composed of

And the delta is a PDCCH candidate index offset.

10. The method according to any of claims 1, 3, 4 and 7, further comprising being configured with a fourth association between the first CORESET and the second CORESET, wherein the fourth association represents that the first symbol of the first CORESET is associated with the first symbol of the second CORESET.

11. A method of enhancing Physical Downlink Control Channel (PDCCH) reception, the method being executable by an apparatus and comprising:

receiving a configuration of a repetition of first Downlink Control Information (DCI) and a repetition of the first DCI;

acquiring a first copy of first DCI in first PDCCH candidates allocated to a first control resource set (CORESET) according to the configuration;

obtaining a second copy of the first DCI in a second PDCCH candidate assigned to a second CORESET according to the configuration, wherein the first CORESET and the second CORESET are associated with a first search space set; and

obtaining the first DCI from the first copy and the second copy of the first DCI.

12. The method of claim 11, further comprising:

receiving a configuration of a specific DCI format;

determining a DCI format of the first DCI; and

obtaining the first DCI from the first copy and the second copy of the first DCI when a DCI format of the first DCI conforms to the particular DCI format.

13. The method of claim 11, further comprising being configured with a first association between a first and a second copy of the first DCI, wherein the first association represents that the first copy of a first Control Channel Element (CCE) aggregation level used to detect the PDCCH candidate in the first CORESET transmitted by a first transmission and reception node (TRP) is associated with the second copy of a second CCE aggregation level used to detect the second PDCCH candidate in the second CORESET transmitted by a second TRP.

14. The method according to any of claims 11 and 13, further comprising being configured with a second association between the first PDCCH candidate and the second PDCCH candidate, wherein the second association represents a first CCE aggregation level, L₁Is associated with a second CCE aggregation level L₂The second PDCCH candidate of (1), and the L₁Is identical to the L₂。

15. The method of claim 14, wherein the second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe first PDCCH candidate index is the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

The second association represents the CCE aggregation in the second CORESET, etcStage L₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

Is composed of

And the delta is a PDCCH candidate index offset.

16. The method of any of claims 11, 13, and 14, further comprising being configured with a third association between the first PDCCH candidate and the second PDCCH candidate, wherein the third association represents a first Control Channel Element (CCE) aggregation level, L₁Is associated with a second CCE aggregation level L₂The second PDCCH candidate of (1), and the L₁Is different from the L₂。

17. The method of claim 16, wherein the second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe third PDCCH candidate index is the CCE aggregation level L in the first CORESET₁PDCCH candidate m in_sThe third association represents the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate m in_s，

Is composed of

And the delta is a PDCCH candidate index offset.

18. The method of claim 16, wherein the first stepThe second PDCCH candidate index is the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sThe first PDCCH candidate index is the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

The third association represents the CCE aggregation level L in the second CORESET₂PDCCH candidate m in_sAssociated with the CCE aggregation level L in the first CORESET₁PDCCH candidate in (1)

Is composed of

And the delta is a PDCCH candidate index offset.

19. The method according to any of claims 11, 13, 14 and 16, further comprising being configured with a fourth association between the first and second CORESET, wherein the fourth association represents that the first symbol of the first CORESET is associated with the first symbol of the second CORESET.

20. An apparatus for enhanced Physical Downlink Control Channel (PDCCH) reception, executable by an apparatus, comprising:

a transceiver for receiving a repetition of a first Downlink Control Information (DCI) and a configuration of the repetition of the first DCI; and

a processor configured to obtain a first copy of a first control resource set (CORESET) of a first PDCCH candidate allocated to a first CORESET according to the configuration, and obtain a second copy of the first DCI of a second PDCCH candidate allocated to a second CORESET according to the configuration, wherein the first CORESET and the second CORESET are associated with a first search space set,

wherein the processor obtains the first DCI from the first copy and the second copy of the first DCI.

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