Physical downlink control channel candidate resource mapping and transmission for multi-trp operation

Abstract

A base station maps physical downlink control channel (PDCCH) candidates and PDCCH transmissions for multi-transmission reception point (TRP) operation. The base station determines that a control resource set (CORESET) is to be shared by at least a first TRP and a second TRP corresponding to a cell of a network, performs, based on each TRP, resource element group (REG) bundle to virtual REG bundle mapping, where a plurality of REG bundles are indexed based on the each TRP, performs virtual REG bundle interleaving across the first TRP and the second TRP, performs control channel element (CCE) to interleaved REG bundle mapping, and transmits downlink control information (DCI) using the CORESET, where the CORESET is configured based on at least the CCE to interleaved REG bundle mapping.

Description

BACKGROUND

[0001] A cell of a network can be configured to have multiple transmission reception points (TRPs). In a multi-TRP deployment scenario, a physical downlink control channel (PDCCH) can have downlink control information (DCI) repetition over different TRPs. For example, one control resource set (CORESET) can be shared by two TRPs. However, to fully implement this type of functionality, mechanisms configured to perform PDCCH candidate mapping and PDCCH transmission for multi-TRP operation are needed. SUMMARY

[0002] Some example embodiments relate to a processor configured to perform operations. The operations include determining that a control resource set (CORESET) is to be shared by at least a first transmission reception point (TRP) and a second TRP corresponding to a cell of a network; performing, based on each TRP, resource element group (REG) bundle to virtual REG bundle mapping, where a plurality of REG bundles are indexed based on the each TRP; performing virtual REG bundle interleaving across the first TRP and the second TRP; performing control channel element (CCE) to interleaved REG bundle mapping; and transmitting, using the CORESET, downlink control information (DCI), where the CORESET is configured based at least on the CCE to interleaved REG bundle mapping.

[0003] Other example embodiments relate to a processor configured to perform operations. The operations include monitoring a physical downlink control channel (PDCCH) for downlink control information (DCI) transmitted by a cell of a network; receiving, from the cell of the network, the DCI carried by the PDCCH, and performing operations in response to the DCI.

[0004] Still other example embodiments relate to a cell comprising a communication interface configured to communicate with a user equipment (UE) and a processor communicatively coupled to the communication interface and configured to perform operations. The operations include determining that a control resource set (CORESET) is to be shared by at least a first transmission reception point (TRP) and a second TRP of the cell; performing, based on each TRP, resource element group (REG) bundle to virtual REG bundle mapping, where a plurality of REG bundles are indexed based on the each TRP; performing virtual REG bundle interleaving across the first TRP and the second TRP; performing control channel element (CCE) to interleaved REG bundle mapping; and transmitting, using the CORESET, downlink control information (DCI), where the CORESET is configured based at least on the CCE to interleaved REG bundle mapping. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1 An example network arrangement is shown in accordance with various example embodiments.

[0006] Figure 2 Examples of multiple transmission reception points (TRPs) deployed at different locations are shown in accordance with various example embodiments.

[0007] Figure 3 An example user equipment (UE) is shown in accordance with various example embodiments.

[0008] Figure 4 A method for multi-TRP physical downlink control channel (PDCCH) transmission is shown in accordance with various example embodiments.

[0009] Figure 5 Examples of virtual resource element group (REG) bundle staggering across multiple TRPs are shown in accordance with various example embodiments.

[0010] Figure 6 Examples of control channel element (CCE) to REG bundle mapping with TRP dependent REG bundle shifting are shown in accordance with various example embodiments.

[0011] Figure 7 Examples of REG bundle based CCE to virtual REG bundle mapping for PDCCH transmission for multiple TRP operation are shown in accordance with various example embodiments.

[0012] Figure 8 Examples of CCE bundles for different aggregation levels are shown in accordance with various example embodiments. DETAILED DESCRIPTION

[0013] The example embodiments can be further understood with reference to the following description and related drawings in which like elements are referred to with like reference designations. The example embodiments relate to multi-transmission reception point (TRP) deployments. As will be described below, the example embodiments include techniques related to physical downlink control channel (PDCCH) candidate mapping and PDCCH transmission for multi-TRP operation.

[0014] The example embodiments are described with reference to a user equipment (UE). However, the reference to a UE is provided merely for illustrative purposes. The example embodiments can be used with any electronic component that can establish a connection with a network and is configured with hardware, software, and / or firmware for exchanging information and data with the network. Accordingly, the UE described herein is used to represent any electronic component.

[0015] Exemplary embodiments are also described with reference to 5G New Radio (NR) networks. However, the reference to 5G NR networks is provided for illustrative purposes only. Exemplary embodiments can be used with any network configured to have multi-TRP capabilities. Thus, a 5G NR network as described herein can represent any type of network configured to have multi-TRP capabilities.

[0016] A 5G NR network can deploy next generation NodeBs (gNBs) configured to have multiple TRPs. Throughout the detailed description, a TRP generally refers to a set of components configured to transmit and / or receive signals. In some embodiments, multiple TRPs can be deployed locally at a gNB. For example, a gNB can include multiple antenna arrays / panels each configured to generate a different beam. In other embodiments, multiple TRPs can be deployed at various different locations and connected to a gNB via a backhaul connection. For example, multiple small cells can be deployed at different locations and connected to a gNB. However, these examples are provided for illustrative purposes only. Those skilled in the art will appreciate that a TRP is configured to be adaptable to a variety of different conditions and deployment scenarios. Thus, any reference to a TRP as a particular network component or to multiple TRPs deployed in a particular arrangement is for illustrative purposes only. A TRP as described herein can represent any type of network component configured to transmit and / or receive signals.

[0017] In multi-TRP deployment scenarios, a PDCCH can include downlink control information (DCI) repetition over different TRPs. For example, a control resource set (CORESET) can be shared by two TRPs with different transmission configuration indication (TCI) states. In one example configuration, one PDCCH candidate in a given search space (SS) set can be associated with both TCI states of the CORESET. In another example configuration, two groups of PDCCH candidates in a given SS set can be associated with the two TCI states of the CORESET, respectively. In a third example configuration, two groups of PDCCH candidates can be associated with two corresponding SS sets, where two SS states are associated with the CORESET and each SS set is associated with only one TCI of the CORESET. Those skilled in the art will appreciate that a group of PDCCH candidates can contain one or more PDCCH candidates and the PDCCH candidates in a group correspond to repetitions. However, to fully implement this type of functionality, mechanisms configured to perform PDCCH candidate mapping and PDCCH transmission for multi-TRP operation are needed. Specific embodiments of example PDCCH candidate mapping and PDCCH transmission techniques for multi-TRP deployment scenarios will be described in greater detail below.

[0018] Figure 1An example network arrangement 100 is shown in accordance with various example embodiments. The example network arrangement 100 includes a UE 110. Those skilled in the art will appreciate that the UE 110 can be any type of electronic component configured to communicate via a network, such as a mobile phone, tablet, desktop computer, smart phone, phablet, embedded device, wearable device, Internet of Things (IoT) device, etc. It will also be appreciated that a practical network arrangement can include any number of UEs used by any number of users. Thus, only an example with a single UE 110 is provided for purposes of illustration.

[0019] The UE 110 can be configured to communicate with one or more networks. In the example of network arrangement 100, the network with which the UE 110 can wirelessly communicate is a 5G NR Radio Access Network (RAN) 120. However, the UE 110 can also communicate with other types of networks (e.g., a 5G cloud RAN, a Next Generation RAN (NG-RAN), a Long Term Evolution RAN, a traditional cellular network, a WLAN, etc.), and the UE 110 can also communicate with networks through a wired connection. With respect to example embodiments, the UE 110 can establish a connection with the 5G NR RAN 120. Thus, the UE 110 can have a 5G NR chipset to communicate with the NR RAN 120.

[0020] The 5G NR RAN 120 can be part of a cellular network that can be deployed by a network operator (e.g., Verizon, AT&T, T-Mobile, etc.). The 5G NR RAN 120 may, for example, include a cell or base station (node B, eNodeB, HeNB, eNBS, gNB, gNodeB, macrocell base station, microcell base station, picocell base station, femtocell base station, etc.) configured to transmit and receive communication traffic from UEs equipped with the appropriate cellular chipset.

[0021] In the network arrangement 100, the 5G NR RAN 120 includes a cell 120A that represents a gNB configured to have multiple TRPs. Each TRP can represent one or more components configured to transmit and / or receive signals. In some embodiments, the multiple TRPs can be deployed locally at the cell 120A. In other embodiments, the multiple TRPs can be distributed at different locations and connected to the gNB.

[0022] Figure 2Examples are shown of multiple TRPs deployed at different locations. In this example, the gNB 205 is configured with a first TRP 210 via backhaul connection 212 and a second TRP 220 via backhaul connection 222. Each of the TRPs 210, 220 can transmit signals to and / or receive signals from the UE 110. However, the gNB 205 can be configured to control the TRPs 210, 220 and perform operations such as, but not limited to, allocating resources, PDCCH candidate resource mapping, staggering, etc.

[0023] Figure 2 The illustrated examples are not intended to limit the example embodiments in any way. One of skill in the art will understand that 5G NR TRPs are applicable to a variety of different conditions and deployment scenarios. Actual network arrangements can include any number of different types of cells and / or TRPs deployed by any number of RANs in any suitable arrangement. Thus, Figure 1 a single cell 120A in Figure 2 the example of a single gNB 205 with two TRPs 210, 220 in

[0024] Returning to the network arrangement 100 of Figure 1 , the cell 120A can include one or more communication interfaces to exchange data and / or information with UEs, corresponding RANs, a cellular core network 130, the Internet 140, etc. Further, the cell 120A can include a processor configured to perform various operations. For example, the processor of the cell 120A can be configured to perform operations related to PDCCH candidate mapping and PDCCH transmission. However, reference to a processor is for illustrative purposes only. Operations of the cell 120A can also be represented as standalone combinational logic components of the cell 120A, or can be modular components coupled to the cell 120A, e.g., integrated circuits with or without firmware. For example, an integrated circuit can include input circuitry to receive signals and processing circuitry to process signals and other information. Further, in some embodiments, the functionality of the processor is split between two or more processors, such as a baseband processor and an application processor. The example embodiments can be implemented in accordance with any of these or other configurations of the cell.

[0025] The UE 110 can connect to the 5G NR-RAN 120 via the cell 120A. Those skilled in the art will appreciate that any relevant procedures can be performed for the UE 110 to connect to the 5G NR-RAN 120. For example, as described above, the 5G NR-RAN 120 can be associated with a particular cellular provider at which the UE 110 and / or its user has an agreement and credential information (e.g., stored on a SIM card). Upon detecting the presence of the 5G NR-RAN 120, the UE 110 can transmit the corresponding credential information in order to associate with the 5G NR-RAN 120. More specifically, the UE 110 can associate with a particular cell (e.g., the cell 120A). However, as described above, the reference to the 5G NR-RAN 120 is for illustrative purposes and any appropriate type of RAN can be used.

[0026] In addition to the 5G NR RAN 120, the network arrangement 100 also includes a cellular core network 130, an Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 can be viewed as an interconnected set of components that manage the operation and traffic of the cellular network. The cellular core network 130 also manages traffic that flows between the cellular network and the Internet 140. The IMS 150 can generally be described as an architecture for delivering multimedia services to the UE 110 using IP protocols. The IMS 150 can communicate with the cellular core network 130 and the Internet 140 to provide multimedia services to the UE 110. The network services backbone 160 communicates with the Internet 140 and the cellular core network 130, either directly or indirectly. The network services backbone 160 can generally be described as a set of components (e.g., servers, network storage arrangements, etc.) that implement a suite of services that can be used to extend the functionality of the UE 110 in communicating with various networks.

[0027] As described above, example embodiments include techniques related to physical downlink control channel (PDCCH) candidate mapping and PDCCH transmission for multi-TRP operation. From the perspective of the UE 110, implementing these example techniques can provide performance benefits for operations related to PDCCH monitoring and / or PDCCH reception, as these example techniques improve the reliability and robustness of the PDCCH channel in multi-TRP deployment scenarios.

[0028] Figure 3 An example UE 110 according to various example embodiments is shown. Reference will be made to Figure 1The UE 110 will be described with reference to the network arrangement 100. The UE 110 can include a processor 305, a memory arrangement 310, a display device 315, an input / output (I / O) device 320, a transceiver 325, and other components 330. The other components 330 can include, for example, an audio input device, an audio output device, a power source, a data acquisition device, a port for electrically connecting the UE 110 to other electronic devices, and the like.

[0029] The processor 305 can be configured to execute a number of engines of the UE 110. For example, the engines can include a multi-TRP PDCCH monitoring engine 335. The multi-TRP PDCCH monitoring engine 335 can be configured to perform operations related to PDCCH monitoring and reception in multi-TRP deployment scenarios. For example, the multi-TRP PDCCH monitoring engine 335 can monitor for PDCCH for a CORESET shared by multiple TRPs.

[0030] The above engines are exemplary only as applications (e.g., programs) executed by the processor 305. The functionality associated with the engines can also be represented as standalone combined components of the UE 110, or can be modular components coupled to the UE 110, such as integrated circuits with or without firmware. For example, the integrated circuits can include input circuitry to receive signals and processing circuitry to process the signals and other information. The engines can also be embodied as one application or as multiple applications separate from one another. Moreover, in some UEs, the functionality described with respect to the processor 305 is split between two or more processors, such as a baseband processor and an application processor. The example embodiments can be implemented in any of these or other configurations of the UE.

[0031] The memory arrangement 310 can be a hardware component configured to store data related to operations performed by the UE 110. The display device 315 can be a hardware component configured to display data to a user, while the I / O device 320 can be a hardware component that enables a user to make inputs. The display device 315 and the I / O device 320 can be separate components or can be integrated together, such as a touch screen. The transceiver 325 can be a hardware component configured to establish a connection with the 5G NR-RAN 120, a LTE-RAN (not shown), a legacy RAN (not shown), a WLAN (not shown), and the like. Thus, the transceiver 325 can operate on a variety of different frequencies or channels (e.g., contiguous sets of frequencies).

[0032] As noted above, example embodiments relate to PDCCH. The PDCCH can include a CORESET, which refers to a set of time and frequency resources used to carry DCI. The resource elements (REs) of the CORESET can be characterized in terms of REGs and REG bundles. Each REG can include a number of REs (e.g., 2, 6, 12, etc.) in one orthogonal frequency-division multiplexing (OFDM) symbol, and each REG bundle can include a number of REGs.

[0033] The PDCH can be carried by a certain number of control channel elements (CCEs). For example, the PDCCH can be carried by 1, 2, 4, 8, 16, or any other suitable number of CCEs. Each CCE can include a number of REGs (e.g., 6 or any other suitable amount). For PDCCH transmission, CCE-to-REG mapping can be performed. Examples of CCE-to-REG mapping for multi-TRP PDCCH transmission will be provided in detail below.

[0034] At the UE 110 side, PDCCH reception can include monitoring PDCCH candidates. In some embodiments, this can include blind decoding a number of PDCCH candidates in a search space. PDCCH monitoring and reception of a CORESET can require UE 110 to take certain complexity and energy cost in exchange for scheduling flexibility and lower overhead at the network side. The example techniques described herein improve both UE and network performance, as these example techniques improve the reliability and robustness of the PDCCH channel in multi-TRP deployment scenarios.

[0035] Figure 4 A method 400 for multi-TRP PDCCH transmission according to various example embodiments is shown. The method 400 will be described from the perspective of the cell 120A of the network arrangement 100.

[0036] A CORESET can be shared by multiple TRPs with different TCI states. The CCE-to-REG mapping for a shared CORESET can be interleaved or non-interleaved in units of REG bundles. The method 400 will describe different example techniques for CCE-to-REG mapping of a CORESET shared by multiple TRPs. As will be described in more detail below, the example techniques can enable REG bundle interleaving across multiple TRPs, and thus improve PDCCH performance by exploiting spatial diversity benefits.

[0037] At 405, the cell 120A can number multiple REG bundles based on each TRP. In this example, the REG bundles defined in Rel-15 are reused and indexed based on each TRP. However, example embodiments are not limited to the REG bundles defined in Rel-15, and can be applicable to any suitable type of REG bundle.

[0038] The number of REG bundles per TRP can be denoted as which can be defined as {iL, iL+1,..., iL+L-1}, where L is the REG bundle size, m is the TRP index, and i is defined as and which denotes the number of CORESETs in the shared CORESET for the TRP.

[0039] In 410, the cell 120A can perform REG bundle to virtual REG bundle mapping per TRP. The mapping can be denoted by which can be defined as where f(.) is the interleaver for CCE to REG mapping defined in Rel-15, and j is the index of the virtual REG bundle.

[0040] In 415, the cell 120A can perform virtual REG bundle interleaving across multiple TRPs. An example of this case is shown as Figure 5 .

[0041] The virtual REG (V-REG) input to the multi-TRP interleaver can be represented by . The output V-REG bundles from the multi-TRP interleaver can be derived by assigning as the number of columns of a matrix. The columns of the matrix can be numbered from left to right as 0, 1, 2,..., C REGB -1. Then, the number of rows of the matrix can be based on N TRP , which denotes the number of TRPs of the shared CORESET.

[0042] Next, the V-REG bundle sequence can be written into the matrix (C REGB x N TRP ) row by row in increasing order of V-REGB and TRP, starting from the first TRP (e.g., m = 0).

[0043] The output of the V-REGB interleaver is the V-REGB sequence read out column by column from the matrix (C REGB x N TRP ), which is represented by , where

[0044] In 420, the cell 120A can perform CCE to interleaved virtual REG bundle mapping. In this example, CCEj consists of interleaved virtual REG bundles (CCE to V-REGB) denoted as .

[0045] In 425, cell 120A performs a PDCCH transmission to UE 110. For example, cell 120A can transmit a DCI to UE 110 using a CORESET shared by the first TRP and a different second TRP. The CORESET is based on the CCE to virtual REG bundle mapping described above. UE 110 can receive the DCI carried by the PDCCH and perform a subsequent operation (e.g., transmission, reception, etc.) in response to the DCI. The examples provided above are described with reference to a first TRP and a second TRP sharing a single CORESET. However, the example implementations are not limited to two TRPs sharing a single CORESET. Those skilled in the art will understand how the example techniques described herein can be applied to more than two TRPs.

[0046] In some implementations, the parameter may be introduced in 415-420 of method 400 to shift REG bundles in different TRPs when constructing CCEs. The value of m is a function of the TRP index m. In one example, In another example, the value of m can be configured by higher layer signaling, e.g., by system information block (SIB) information or dedicated signaling.

[0047] Figure 6 An example of CCE to REGB mapping with TRP dependent REG bundle shifting is shown in accordance with various example implementations. In this example, when the matrix (C REGB xN TRP ) is written row by row in increasing order of V-REGBand TRP, starting with the first TRP for even CCE index 2 and the order is switched to start with the second TRP for odd CCE index 2K+1. This can ensure that all PDCCH resources across all TRPs are utilized.

[0048] In some implementations, the parameter may be configured on a per-CORESET basis and share a single value for all TRPs of the corresponding CORESET. In this example, by assigning different shift values for different clusters but a single value for multiple TRPs within a cluster, interference coordination of PDCCH across multiple TRP clusters is possible.

[0049] By allowing the REG bundle size to be configured to have a value less than 6 (e.g., 2, 3, etc.), the example techniques described above with reference to Figure 4 to Figure 6 may be extended to non-interleaved CCE to REG mapping.

[0050] Figure 7An example of REG bundle-based CCE to virtual REG bundle mapping for PDCCH transmission on shared CORESET for multiple TRP operation is shown, according to various example embodiments. In this example, the CORESET duration is one OFDM symbol, the frequency domain resources include 24 physical resource blocks (PRBs), the REG bundle size is three, and distributed CCE to REG mapping is performed.

[0051] Different methods can be implemented to determine the CCE across TRPs. In some embodiments, a CCE bundle is introduced for a PDCCH aggregation level L. Figure 8 An example of CCE bundle for different aggregation levels is shown, according to various example embodiments. The following will refer to the description of different methods that can be implemented to determine the CCE across TRPs provided below. Figure 8

[0052] A method (e.g., Option 1 of Figure 8 ) can include CCE bundles within a CORESET of a single TRP. This CCE bundle k can be defined as CCEs {k*L, k*L+1,..., k*L+L-1} of a single TRP, where L denotes the applicable aggregation level. In Figure 8 , three examples are provided. In the first example, L = 2, in the second example, L = 4, and in the third example, L = 8. However, in a real deployment scenario, L can equal 1, 2, 4, 8, or any other appropriate value. Moreover, as shown in Option 1 of Figure 8 , the numbering of the CCE bundle indices is done in increasing order of first TRP and then frequency.

[0053] Another method (e.g., Option 2 of Figure 8 ) can include CCE bundles of CCEs across different TRPs. The CCE bundle k can be defined as CCE pairs and each CCE pair k can include {CCE k in RRP#0, CCE k in RRP#1}. Moreover, as shown in Option 2 of Figure 8 , the numbering of the CCE bundle indices is done in increasing order of frequency.

[0054] In some embodiments, different CORESETs can be configured with different CCE bundle mappings based on different methods (e.g., Option 1 or Option 2 of Figure 8 ) to allow dynamic switching between single TRP transmission and multiple TRP transmission for PDCCH by transmitting PDCCH on different CORESETs with different CCE bundle mapping methods.

[0055] ​For PDCCH monitoring, PDCCH candidate groups to be monitored can be defined in terms of CCE bundles. For example, a CCE bundle corresponding to a PDCCH candidate m with aggregation level L can be expressed by:

[0056]

[0057] Here, the parameter N CCE，p may be defined as the number of CCEs in a CORESET across all TRPs. To provide an example, in Figure 8 , N CCE，p = 8 x 2 = 16, and thus 16 CCEs are shown in each example. may represent the number of PDCCH candidates for search space s of aggregation level L that the UE 110 is configured to monitor. Similarly, analogous to the REG bundle based approach, an offset may be introduced as a function of TRP index to shift the CCE bundle locations, thereby ensuring that the CCE bundles are frequency division multiplexed (FDM) across multiple TRPs to facilitate UE 110 PDCCH reception. In some embodiments, may be expressed in units of CCE bundles.

[0058] Those skilled in the art will understand that the exemplary embodiments described above can be implemented in any suitable software configuration or hardware configuration, or a combination thereof. Exemplary hardware platforms for implementing the exemplary embodiments can include, for example, Intel x86-based platforms with compatible operating systems, Windows OS, Mac platforms and MAC OS, mobile devices with operating systems such as iOS, Android, and the like. Exemplary embodiments of the above-described methods can be embodied as a program including code lines stored on a non-transitory computer-readable storage medium, which, when compiled, can be executed on a processor or microprocessor.

[0059] While this patent application describes various combinations of various embodiments each having different features, one of skill in the art will understand that any feature of one embodiment can be combined with features of other embodiments or features that are not inconsistent with the operation or functionality of the devices of the disclosed embodiments or the functionality described, in any manner not expressly disclosed.

[0060] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled in a way to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.

[0061] It will be apparent to those skilled in the art that various modifications can be made to the disclosed embodiments without departing from the spirit or scope of the disclosure. Thus, it is intended that the disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.

Claims

1. A method performed by a base station, comprising: The control resource set (CORESET) will be shared by at least the first transmit receiving point (TRP) and the second TRP of the cell corresponding to the network. Based on each TRP, a mapping from Resource Element Group (REG) bundles to virtual REG bundles is performed, wherein multiple REG bundles are indexed based on each TRP; Performing virtual REG bundle interleaving across the first TRP and the second TRP, wherein performing virtual REG bundle interleaving across the first TRP and the second TRP includes: The number of columns for the matrix is ​​determined at least based on the number of REGs in the CORESET; The number of rows for the matrix is ​​determined at least based on the number of TRPs sharing the CORESET; The first virtual REG bundle sequence is input into the matrix; At least a second virtual REG bundle sequence is generated based on the matrix; Perform control channel element (CCE) mapping to interleaved REG bundles; and The CORESET is used to transmit downlink control information (DCI), wherein the CORESET is configured at least based on the CCE to interleaved REG bundle mapping.

2. The method according to claim 1, wherein the first virtual REG bundle sequence is input into the matrix row by row in ascending order of virtual REG bundles and TRP.

3. The method according to claim 1, further comprising: Determine whether to use an even-numbered CCE index or an odd-numbered CCE index; When the even-numbered CCE index is to be used, the first virtual REG bundle sequence is input into the matrix row by row from the first TRP in ascending order of the virtual REG bundles; and When the odd CCE index is to be used, the first virtual REG bundle sequence is input into the matrix row by row from the second TRP in ascending order of the virtual REG bundles.

4. The method according to claim 1, further comprising: When constructing a CCE based on shift parameters, the REG bundles are shifted in different TRPs.

5. The method of claim 4, wherein the shift parameter is a function of the TRP index.

6. The method of claim 4, wherein the shift parameter is configured by higher-layer signaling.

7. The method of claim 4, wherein the shift parameter is configured based on each CORESET.

8. A base station, the base station comprising: A communication interface configured to communicate with user equipment (UE); and A processor, which is communicatively coupled to the communication interface and configured to perform the operations as described in any one of claims 1-7.

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