Wireless communication system for coordinating multi-point communication and its operation method

Abstract

A wireless communication system for coordinating multi-point communication and an operation method thereof are provided. The wireless communication system includes a first cell configured to communicate with a second cell and a terminal. The first cell includes a processor configured to control the first cell: to select one of a plurality of scheduling modes related to rate matching of a physical downlink shared channel (PDSCH) based on control information exchanged with the second cell; and to transmit a first PDSCH to the terminal according to the selected scheduling mode, while the second cell transmits a second PDSCH to the terminal according to the selected scheduling mode. The terminal is configured to perform processing on the first PDSCH and the second PDSCH based on the selected scheduling mode.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of U.S. Provisional Application No. 62 / 992,584, filed on March 20, 2020, with the United States Patent and Trademark Office, and Korean Patent Application No. 10 - 2020 - 0071030, filed on June 11, 2020, with the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entireties. Technical field

[0003] A method, apparatus, and system consistent with example embodiments relate to a wireless communication system, and more particularly, to a wireless communication system for performing coordinated multi - point (CoMP) communication transmission and reception. Background art

[0004] To improve the performance and user quality of wireless communication systems, research and standardization of CoMP technology between cells are underway. CoMP between cells generally refers to a technology of mutual coordination based on geographically separated transmission points or reception points.

[0005] In addition, wireless communication technologies, such as next - generation communication technologies like the fifth - generation (5G), are continuously developed according to the needs of users and operators, and research on the efficient operation of CoMP technology is underway. Summary of the invention

[0006] Example embodiments provide a wireless communication system and a method of operating the wireless communication system that ensure more improved coordinated multi - point (CoMP) performance by reducing complexity when a terminal processes physical downlink shared channels (PDSCHs) received from multiple cells and by differentiating scheduling modes for PDSCHs received from multiple cells according to the performance of the terminal.

[0007] The technical problems to be achieved are not limited to the above - mentioned technical problems, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art from the following description.

[0008] According to an aspect of an example embodiment, a wireless communication system includes: a first cell configured to communicate with a second cell and a terminal. The first cell includes a processor configured to control the first cell: select one of a plurality of scheduling modes related to rate matching of a physical downlink shared channel (PDSCH) based on control information exchanged with the second cell; and transmit a first PDSCH to the terminal according to the selected scheduling mode, while the second cell transmits a second PDSCH to the terminal according to the selected scheduling mode. The terminal is configured to perform processing on the first PDSCH and the second PDSCH based on the selected scheduling mode.

[0009] According to one aspect of an exemplary embodiment, a terminal includes: a radio frequency integrated circuit (RFIC) configured to receive a first physical downlink shared channel (PDSCH) from a first cell and a second PDSCH from a second cell based on a selected scheduling mode among a plurality of scheduling modes related to rate matching of the PDSCH; and a processor configured to perform processing on the first PDSCH and the second PDSCH based on the selected scheduling mode.

[0010] According to one aspect of an exemplary embodiment, a method of operating a first cell of a wireless communication system including a first cell, a second cell, and a terminal includes: selecting, by the first cell, one of a plurality of scheduling modes related to rate matching of a physical downlink shared channel (PDSCH) based on control information exchanged with the second cell; and transmitting, by the first cell, a first PDSCH to the terminal according to the selected scheduling mode while the second cell transmits a second PDSCH to the terminal according to the selected scheduling mode. The terminal processes the first PDSCH and the second PDSCH based on the selected scheduling mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other objects and features will become more apparent from the following description of exemplary embodiments with reference to the accompanying drawings, in which:

[0012] Figure 1 is a block diagram of a wireless communication system according to an exemplary embodiment;

[0013] Figure 2A is Figure 1 a diagram of a basic time-domain and frequency-domain structure in the wireless communication system of Figure 2B is Figure 1 a diagram of a physical downlink shared channel (PDSCH) in the wireless communication system of

[0014] Figure 3A 、 Figure 3B and Figure 3C are diagrams for describing Figure 1 an overlapping relationship between a first PDSCH and a second PDSCH of

[0015] Figure 4A and Figure 4B are flowcharts showing a method of operating a wireless communication system according to an exemplary embodiment;

[0016] Figure 5 is a diagram for describing an operation of a terminal when a first PDSCH and a second PDSCH overlap with each other;

[0017] Figure 6A 、 Figure 6B and Figure 6Cis a diagram for describing a first PDSCH and a second PDSCH under multiple scheduling modes according to an exemplary embodiment;

[0018] Figure 7 is a diagram for describing the operation of a terminal when the first PDSCH and the second PDSCH overlap each other;

[0019] Figure 8A 、 Figure 8B and Figure 8C is a diagram for describing a first PDSCH and a second PDSCH under multiple scheduling modes according to an exemplary embodiment;

[0020] Figure 9 is a diagram for describing the operation of a terminal when the first PDSCH and the second PDSCH overlap each other;

[0021] Figure 10A 、 Figure 10B and Figure 10C is a diagram for describing a first PDSCH and a second PDSCH under multiple scheduling modes according to an exemplary embodiment;

[0022] Figure 11 is a flowchart showing a method of operating a wireless communication system according to an exemplary embodiment;

[0023] Figure 12A 、 Figure 12B and Figure 12C is a diagram showing a method of operating a wireless communication system according to an exemplary embodiment;

[0024] Figure 13 is a block diagram of an electronic device according to an exemplary embodiment. Detailed Description of the Embodiment

[0025] Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

[0026] Figure 1 is a block diagram of a wireless communication system 10 according to an exemplary embodiment. The wireless communication system 10 may be a fifth generation (5G) system, a long term evolution (LTE) system, a code division multiple access (CDMA) system, a global system for mobile communications (GSM) system, a wireless local area network (WLAN) system, or any other wireless communication system, but is not limited thereto. Hereinafter, the wireless communication system 10 will be described on the assumption that it is a 5G system, but it will be understood that the exemplary embodiments are not limited thereto.

[0027] The terminal 100 may refer to various devices capable of transmitting and receiving data and / or control information by communicating with the first cell 110 and the second cell 120. The terminal 100 may be a wireless communication device and may be fixed or mobile. For example, the terminal 100 may be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a handheld device.

[0028] Each of the first cell 110 and the second cell 120 generally may refer to a fixed station that communicates with the terminal 100 and / or other cells, and may exchange data and control information by communicating with the terminal 100 and / or other cells. For example, each of the first cell 110 and the second cell 120 may be referred to as a base station, a Node B, an evolved Node B (eNB), a sector, a site, a base transceiver system (BTS), an access point (AP), a relay node, a remote radio head (RRH), a radio unit (RU), a small cell, etc. In this specification, each of the first cell 110 and the second cell 120 may have a comprehensive meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node B in WCDMA, and an eNB or a sector (site) in LTE, and may cover all of various coverage ranges such as the communication ranges of a macro cell, a micro cell, a pico cell, a femto cell, a relay node, an RRH, an RU, and a small cell.

[0029] The wireless communication network between the terminal 100 and the first cell 110 and the second cell 120 may support communication between users by sharing available network resources. For example, in a wireless communication network, information may be transmitted by various multiple access methods such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), OFDM-FDMA, OFDM-TDMA, and OFDM-CDMA.

[0030] Referring to Figure 1 , the wireless communication system 10 may include the first cell 110, the second cell 120, and the terminal 100. In Figure 1 , for ease of description, a limited number of cells and terminals are shown, but this is only an example, and the example embodiments are not limited thereto. Obviously, the example embodiments may be applied to a wireless communication system including a large number of cells and terminals. Additionally, it is a prerequisite that the first cell 110, the second cell 120, and the terminal 100 perform coordinated multi-point communication (CoMP).

[0031] The terminal 100 can communicate with the first cell 110 and the second cell 120 through the uplink and downlink with the first cell 110 and the second cell 120 respectively. For example, in the uplink and downlink, control information can be sent through control channels such as the Physical Downlink Control Channel (PDCCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Uplink Control Channel (PUCCH), Enhanced Physical Downlink Control Channel (EPDCCH), and data can be sent through data channels such as the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH). In this specification, sending / receiving signals through the PDSCH or PDCCH can be expressed in the form of "sending / receiving the PDSCH or PDCCH".

[0032] In an exemplary embodiment, the first cell 110 and the second cell 120 can select any one of a plurality of scheduling modes related to the rate matching of the PDSCH, and send the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 to the terminal 100 respectively according to the selected scheduling mode.

[0033] In an exemplary embodiment, the plurality of scheduling modes related to the rate matching of the PDSCH can include scheduling modes that are different in the way of allocating resources for performing rate matching to a signal when the terminal 100 receives the PDSCH. For example, the signal for performing rate matching can include at least one of a Phase Tracking Reference Signal (PTRS) and an Aperiodic Zero-Power Channel State Information-Reference Signal (ZP CSI-RS). This will be described in detail with reference to Figures 5 to 8C However, the descriptions of the PTRS and the aperiodic ZP CSI-RS are examples, and the exemplary embodiment is not limited thereto. The exemplary embodiment can be applied to various reference signals sent through the PDSCH.

[0034] In an exemplary embodiment, the plurality of scheduling modes related to the rate matching of the PDSCH can include scheduling modes that are different in the way of allocating resources for performing rate matching to a signal when the terminal 100 receives the PDSCH, in the way of the first cell and the second cell sending a Downlink Control Indicator (DCI) indicating the selected scheduling mode to the terminal, or in the way of setting the selected scheduling mode through upper layer signaling with the terminal. As another example, a resource block can be defined to be scheduled by the PDCCH. This will be described in detail with reference to Figures 9 to 10C However, the descriptions of the PTRS and the aperiodic ZP CSI-RS are examples, and the exemplary embodiment is not limited thereto. The exemplary embodiment can be applied to various reference signals sent through the PDSCH.

[0035] In an exemplary embodiment, each of the first cell 110 and the second cell 120 may receive, from the terminal 100, performance information indicating a processing method supported by the terminal 100, and may select one of a plurality of scheduling modes based on the received performance information. For example, when resources corresponding to the first PDSCH PDSCH_1 and resources corresponding to the second PDSCH PDSCH_2 overlap with each other, the processing method may be changed according to the type of signal assigned to the overlapping resources, and the first cell 110 and the second cell 120 may schedule the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 to conform to the processing method supported by the terminal 100. On the other hand, when the terminal 100 supports all processing methods, the first cell 110 and the second cell 120 may select a scheduling mode capable of ensuring optimal communication performance to schedule the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2.

[0036] In an exemplary embodiment, the first cell 110 and the second cell 120 may send a first downlink control indicator (DCI) DCI_1 and a second downlink control indicator (DCI) DCI_2 indicating scheduling information of the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 to the terminal 100 based on the selected scheduling mode. The terminal 100 may perform processing operations on the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 based on the first downlink control indicator DCI_1 and the second downlink control indicator information DCI_2. In some exemplary embodiments, the first cell 110 and the second cell 120 may set the selected scheduling mode through upper layer signaling with the terminal 100. The downlink control indicators DCI_1 and DCI_2 may include downlink scheduling allocation information, and the downlink scheduling allocation information includes PDSCH resource designation, transmission format, hybrid automatic repeat request (HARQ) information, and spatial multiplexing related control information. The terminal 100 may receive the first downlink control indicator DCI_1 and the second downlink control indicator DCI_2 from the first cell 110 and the second cell 120 through the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2. In some exemplary embodiments, the first cell 110 and the second cell 120 may exchange scheduling information about the terminal 100 and operate in the same scheduling mode respectively.

[0037] The wireless communication system 10 according to the exemplary embodiment may schedule the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 in consideration of the performance of the terminal 100 to perform CoMP suitable for the terminal 100. In addition, by pre-selecting a plurality of scheduling modes related to the rate matching of the PDSCH and scheduling the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 by the first cell 110 and the second cell 120 in a common scheduling mode, the wireless communication system 10 has the effect of improving the complexity of CoMP.

[0038] Figure 2A is Figure 1 a diagram of the time-frequency domain basic structure in a wireless communication system, Figure 2B is Figure 1 a diagram of the PDSCH in a wireless communication system.

[0039] Referring to Figure 2A , the horizontal axis may represent the time domain and the vertical axis may represent the frequency domain. The minimum transmission unit in the time domain is an orthogonal frequency division multiplexing (OFDM) symbol, and N symb OFDM symbols 202 may be aggregated to form a time slot 206, and N time slots (N is an integer greater than or equal to 1) may be aggregated to form a subframe 205. For example, the number of time slots constituting the subframe 205 may be determined by the "Numerology" of the communication system. For example, the length of the time slot 206 may be 0.5 ms, and the length of the subframe may be 1.0 ms. In addition, the radio frame 214 may be a time domain unit including 10 subframes 205.

[0040] The minimum transmission unit in the frequency domain is a subcarrier, and the entire transmission bandwidth may include a total of N BW subcarriers 204. In the time-frequency domain, the basic unit of the resource is a resource element (RE) 212, and it may be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) 208 may be defined as N symb consecutive OFDM symbols 202 in the time domain and N RB consecutive subcarriers 210 in the frequency domain. Therefore, one RB 208 may include (N symb ×N RB ) REs 212. The downlink channels including PDCCH, PDSCH, etc. may be transmitted from the cell in the wireless communication system to the terminal through the resources in the time-frequency domain as shown in Figure 2A .

[0041] Referring to Figure 2B, the PDCCH 302 can be frequency multiplexed with the PDSCH 303 and transmitted. In a cell, the resources of the PDCCH 302 and the resources of the PDSCH 303 can be appropriately allocated by scheduling. Therefore, the coexistence with data transmission to a terminal can be effectively supported. Multiple PDCCHs 302 can form a PDCCH set 306. The location information of the PDCCH set 306 is set specific to a terminal, which can be signaled through radio resource control (RRC). Multiple PDCCH sets 306 can be configured in each terminal, and one PDCCH set 306 can be configured to be multiplexed to different terminals simultaneously. In the PDCCH 302, the demodulation reference signal (DMRS) 305 can be used as a reference signal for decoding.

[0042] Figures 3A to 3C is used to describe Figure 1 the overlapping relationship between the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2.

[0043] Referring to Figure 1 and Figure 3A , the first PDSCH PDSCH_1 can partially overlap with the second PDSCH PDSCH_2. In an exemplary embodiment, the first cell 110 and the second cell 120 can perform scheduling such that the overlapping area includes at least one first resource among the resources of the first PDSCH PDSCH_1 corresponding to the PTRS or the aperiodic ZP CSI-RS included in the second PDSCH PDSCH_2, and the overlapping area includes at least one second resource among the resources of the second PDSCH PDSCH_2 corresponding to the PTRS or the aperiodic ZP CSI-RS included in the first PDSCH PDSCH_1. In another exemplary embodiment, the first cell 110 and the second cell 120 can perform scheduling such that the overlapping area does not include the resources corresponding to the PTRS or the aperiodic ZP CSI-RS included in the first PDSCH PDSCH_1 and the resources corresponding to the PTRS or the aperiodic ZP CSI-RS included in the second PDSCH PDSCH_2.

[0044] In an exemplary embodiment, the first cell 110 and the second cell 120 may perform scheduling such that the overlapping region includes resource blocks that are at least partially or fully overlapped with the resource blocks rate-matched for the second PDSCH PDSCH_2 among the resource blocks rate-matched for the first PDSCH PDSCH_1. In another exemplary embodiment, the first cell 110 and the second cell 120 may perform scheduling such that the overlapping region does not include resource blocks that are at least partially or fully overlapped with the resource blocks rate-matched for the second PDSCH PDSCH_2 among the resource blocks rate-matched for the first PDSCH PDSCH_1.

[0045] Further referring to Figure 3B , the first PDSCH PDSCH_1 may be fully overlapped with the second PDSCH PDSCH_2. In this regard, the first PDSCH PDSCH_1 may be fully overlapped with the second PDSCH PDSCH_2 based on the frequency axis and the time axis. Additionally, the first PDSCH PDSCH_1 may be overlapped with the second PDSCH PDSCH_2 over the entire region based on the frequency axis and may be overlapped only in a partial region based on the time axis. In summary, the first cell 110 and the second cell 120 may perform scheduling such that the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 are overlapped as a whole based on the frequency axis and the time axis, or are overlapped over the entire region based on the frequency axis.

[0046] Further referring to Figure 3C , the first PDSCH PDSCH_1 may not be overlapped with the second PDSCH PDSCH_2 based on the frequency axis. That is, the first cell 110 and the second cell 120 may perform scheduling such that the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 are not overlapped with each other based on the frequency axis.

[0047] Figures 3A to 3C The overlapping relationship between the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 disclosed in

[0048] Figure 4A and Figure 4B are flowcharts showing methods of operating a wireless communication system according to exemplary embodiments.

[0049] Referring to Figure 4A, in operation S100a, each of the multiple cells in the wireless communication system may select any one of multiple scheduling modes. In an exemplary embodiment, the scheduling mode relates to a scheduling scheme for the PDSCH transmitted from each cell to the terminal. When the PDSCHs from the cells partially or completely overlap each other, the terminal may have different processing methods for the data / reference signals (or data / non-data) or multiple data / data assigned to the overlapping resources. On the other hand, when the terminal processes the overlapping resources sequentially, if the processing method changes frequently, the processing complexity of the terminal increases, which may have a negative impact on terminals with low performance. In operation S120a, the cell may perform scheduling for the PDSCH based on the scheduling mode selected from the multiple scheduling modes so as to reduce the processing complexity of the terminal, and may transmit the scheduled PDSCH to the terminal. The terminal may pre-identify the scheduling modes selected by the multiple cells and may perform processing operations on the PDSCH in a manner consistent with the selected scheduling mode.

[0050] Refer to Figure 4B , in operation S100b, each of the multiple cells in the wireless communication system may receive performance information from the terminal. The performance information of the terminal may indicate the supported processing methods. That is, the type of signals assigned to the overlapping resources of the PDSCH received from the multiple cells may vary according to the scheduling mode for the PDSCH, and the cells may check whether they can process the signals assigned to the overlapping resources based on the performance information. In operation S120b, the multiple cells may select one of the multiple scheduling modes based on the performance of the terminal. In operation S140b, the multiple cells may perform scheduling of the PDSCH based on the selected scheduling mode and may transmit the scheduled PDSCHs to the terminal respectively.

[0051] Figure 5 is a diagram for describing the operation of the terminal when the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 overlap each other according to an exemplary embodiment. Hereinafter, it is assumed that the PTRS is assigned to the resource region in a constant pattern along the time axis in the same frequency domain, but the exemplary embodiment is not limited thereto. The exemplary embodiment may be applied to various patterns of PTRS.

[0052] Refer to Figure 1 and Figure 5, the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 may overlap on the first resource element RE_1 to the sixth resource element RE_6. Multiple data / data may be allocated to the first resource element RE_1, the third resource element RE_3, the fourth resource element RE_4, and the sixth resource element RE_6, and data / PTRS may be allocated to the second resource element RE_2 and the fifth resource element RE_5. It is assumed that multiple data / data are modulated by the same modulation technique (e.g., 256 quadrature amplitude modulation (QAM)), and data / PTRS are modulated by different modulation techniques (e.g., 256QAM for data and quadrature phase shift keying (QPSK) for PTRS). However, this is for ease of understanding, and the exemplary embodiments are not limited thereto.

[0053] The terminal 100 may perform a first processing operation PC_11 on the multiple data / data allocated to the first resource element RE_1. More specifically, the terminal 100 may demodulate the multiple data / data allocated to the first resource element RE_1 separately by a demodulation method corresponding to 256QAM. The terminal 100 may perform joint detection on the multiple data / data. Subsequently, the terminal 100 may perform a second processing operation PC_21 on the data / PTRS allocated to the second resource element RE_2. More specifically, among the data / PTRS allocated to the second resource element RE_2, the terminal 100 demodulates the data by a demodulation method corresponding to 256QAM and may perform rate matching on the PTRS. Since the PTRS is a reference signal for phase tracking and has been previously used to obtain the quality of the downlink channel, it is not necessary to demodulate the PTRS, and the PTRS may be processed by rate matching. In summary, the terminal 100 may process the data allocated to the second resource element RE_2 in a first manner and may process the PTRS allocated to the second resource element RE_2 in a second manner. The demodulation order combination of the demodulation operations of the multiple data / data on the first resource element RE_1 performed by the terminal 100 may be different from the demodulation order combination of the demodulation operations of the data / PTRS on the second resource element RE_2.

[0054] In some exemplary embodiments, the terminal 100 may perform joint detection on the data / PTRS allocated to the second resource element RE_2 and may demodulate the data / PTRS by demodulation methods corresponding to 256QAM and QPSK respectively. In addition, the terminal 100 may demodulate the data after removing the PTRS allocated to the second resource element RE_2. In addition, in some exemplary embodiments, the terminal 100 may demodulate the data after performing interference whitening on the second resource element RE_2.

[0055] That is, since the first processing operation PC_11 and the second processing operation PC_21 have different processing methods and the terminal 100 needs to quickly change the processing method to perform the second processing operation PC_21 on the second resource element RE_2, this change may be a factor increasing the processing complexity of the terminal 100. Additionally, in the case of the second processing operation PC_21, since each of the data / PTRS is processed in a heterogeneous manner, the terminal 100 may not support the second processing operation PC_21. This problem may occur when performing a processing operation on the fifth resource element RE_5.

[0056] In the following, the third processing operation PC_31 to the sixth processing operation PC_61 on the third resource element RE_3 to the sixth resource element RE_6 are the same as the above-mentioned first processing operation PC_11 and second processing operation PC_21, and thus, their repeated descriptions will not be given herein.

[0057] The first cell 110 and the second cell 120 according to the exemplary embodiment can reduce the processing complexity of the terminal 100 and can operate in a scheduling mode corresponding to the performance of the terminal 100, which will be described later below.

[0058] Figures 6A to 6C is a diagram for describing the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 in multiple scheduling modes according to the exemplary embodiment.

[0059] Referring to Figure 1 and Figure 6A , the first cell 110 and the second cell 120 can operate in the first scheduling mode such that the resource elements allocated with data and the resource elements allocated with PTRS do not overlap with each other in the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2. In the following, the first cell 110 and the second cell 120 operating in the first scheduling mode will be described.

[0060] In the exemplary embodiment, in order to prevent data / PTRS from being allocated to any resource element, the second cell 120 can schedule the resource elements RE_7 to RE_12 corresponding to the frequency domain of the PTRS of the second PDSCH PDSCH_2 so as not to overlap with the first PDSCH PDSCH_1. Additionally, in order to prevent multiple PTRS / data from being allocated to any resource element, the first cell 110 can schedule the resource elements corresponding to the frequency domain of the PTRS of the first PDSCH PDSCH_1 so as not to overlap with the second PDSCH PDSCH_2.

[0061] Additionally, as an exemplary embodiment, the first cell 110 and the second cell 120 can be as Figure 3CPerform scheduling as shown, such that the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 do not completely overlap with each other in the frequency domain.

[0062] Referring to Figure 1 and Figure 6B the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 may overlap on the first resource element RE_1 to the sixth resource element RE_6. The first cell 110 and the second cell 120 may operate in a second scheduling mode such that among the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2, the second resource element RE_2 and the fifth resource element RE_5 that are not allocated with data overlap with the second resource element RE_2 and the fifth resource element RE_5 that are allocated with PTRS. Hereinafter, the first cell 110 and the second cell 120 operating in the second scheduling mode will be described.

[0063] In an exemplary embodiment, the first cell 110 may not allocate data to the second resource element RE_2 and the fifth resource element RE_5 that are allocated with PTRS of the second PDSCH PDSCH_2. The first cell 110 may allocate non-data to the second resource element RE_2 and the fifth resource element RE_5 through rate matching. The first cell 110 may perform the above operations by obtaining in advance from the second cell 120 scheduling information on the resource elements allocated with PTRS. The terminal 100 may perform a rate matching operation on the non-data / PTRS allocated to the second resource element RE_2 and the fifth resource element RE_5. That is, as described above, since the PTRS is a reference signal for phase tracking and was previously used to obtain the quality of the downlink channel, it is not necessary to demodulate the PTRS, and the PTRS can be processed through rate matching and the non-data can also be processed through rate matching. Similar to the first cell 110, the second cell 120 may not allocate data to the resource elements that are allocated with PTRS of the first PDSCH PDSCH_1.

[0064] By performing processing on the multiple data / data allocated to the first resource element RE_1 based on demodulation corresponding to a specific modulation method and by performing processing on the non-data / PTRS allocated to the second resource element RE_2 based on relatively simple rate matching, compared with Figure 5 the terminal 100 may reduce the processing complexity of the terminal 100. Hereinafter, the processing operations on the third resource element RE_3 to the sixth resource element RE_6 are the same as the processing operations on the first resource element RE_1 and the second resource element RE_2, and therefore, repeated descriptions thereof will not be given herein.

[0065] Referring to Figure 1 and Figure 6C, the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 may overlap on the first resource element RE_1 to the sixth resource element RE_6. The first cell 110 and the second cell 120 may operate in the third scheduling mode, in which multiple data / data are allocated to the first resource element RE_1, the third resource element RE_3, the fourth resource element RE_4, and the sixth resource element RE_6, and multiple data / PTRS are allocated to the second resource element RE_2 and the fifth resource element RE_5. Hereinafter, the first cell 110 and the second cell 120 operating in the third scheduling mode will be described.

[0066] In an exemplary embodiment, the first cell 110 may allocate data to the second resource element RE_2 and the fifth resource element RE_5 to which the PTRS of the second PDSCH PDSCH_2 are allocated. The terminal 100 may perform demodulation operations on multiple data / data allocated to the first resource element RE_1, the third resource element RE_3, the fourth resource element RE_4, and the sixth resource element RE_6, respectively, and may process multiple data / PTRS allocated to the second resource element RE_2 and the fifth resource element RE_5 in a heterogeneous manner such as demodulation operations and rate matching. The second cell 120 may also allocate data to the resource element to which the PTRS of the first PDSCH PDSCH_1 are allocated.

[0067] After confirming that the terminal 100 can support processing data / PTRS in a heterogeneous manner, the first cell 110 and the second cell 120 may operate in the third scheduling mode. In some exemplary embodiments, even when it is confirmed that the terminal 100 can support all types of processing, the first cell 110 and the second cell 120 may, according to the communication environment, Figure 6A in the first scheduling mode of Figure 6B or the second scheduling mode of

[0068] Figure 7 is a diagram for describing the operation of the terminal when the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 overlap each other. Hereinafter, it is assumed that ZP CSI-RS is allocated to the resource area in a constant pattern along the time axis in the same frequency domain, but the exemplary embodiment is not limited thereto. The exemplary embodiment includes various patterns of ZP CSI-RS.

[0069] Referring to Figure 1 and Figure 7, the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 may overlap on the first resource element RE_1 to the sixth resource element RE_6. Multiple data / data may be allocated to the first resource element RE_1, the third resource element RE_3, the fourth resource element RE_4, and the sixth resource element RE_6, and multiple data / ZP CSI-RS may be allocated to the second resource element RE_2 and the fifth resource element RE_5.

[0070] The terminal 100 may perform a first processing operation PC_12 on the multiple data / data allocated to the first resource element RE_1. More specifically, the terminal 100 may demodulate the multiple data / data allocated to the first resource element RE_1 separately by a demodulation method corresponding to 256QAM. The terminal 100 may perform joint detection on the multiple data / data. Subsequently, the terminal 100 may perform a second processing operation PC_22 on the multiple data / ZP CSI-RS allocated to the second resource element RE_2. More specifically, among the multiple data / ZP CSI-RS allocated to the second resource element RE_2, the terminal 100 demodulates the data by a demodulation method corresponding to 256QAM and may perform rate matching on the ZP CSI-RS. Since the ZP CSI-RS was previously used to obtain the quality of the downlink channel, demodulation of the ZP CSI-RS is not required, so the ZP CSI-RS can be processed by rate matching. In summary, the terminal 100 may process the data allocated to the second resource element RE_2 in a first manner and may process the ZP CSI-RS allocated to the second resource element RE_2 in a second manner. The demodulation order combination of the demodulation operations of the multiple data / data on the first resource element RE_1 performed by the terminal 100 may be different from the demodulation order combination of the demodulation operations of the multiple data / ZP CSI-RS on the second resource element RE_2.

[0071] That is, since the first processing operation PC_21 and the second processing operation PC_22 have different processing methods and the terminal 100 needs to quickly change the processing method to perform the second processing operation PC_22 on the second resource element RE_2, this change may be a factor increasing the processing complexity of the terminal 100. Additionally, in the case of the second processing operation PC_22, since each of the multiple data / ZP CSI-RS is processed in a heterogeneous manner, the terminal 100 may not support the second processing operation PC_22. Hereinafter, the third processing operation PC_32 to the sixth processing operation PC_62 on the third resource element RE_3 to the sixth resource element RE_6 are the same as the above-mentioned first processing operation PC_21 and second processing operation PC_22, so their repeated descriptions will not be given herein.

[0072] The first cell 110 and the second cell 120 according to the exemplary embodiment can reduce the processing complexity of the terminal 100 and can operate in a scheduling mode corresponding to the performance of the terminal 100, which will be described later below.

[0073] Figures 8A to 8C is a diagram for describing a first PDSCH PDSCH_1 and a second PDSCH PDSCH_2 in a plurality of scheduling modes according to the exemplary embodiment.

[0074] Referring to Figure 1 and Figure 8A , the first cell 110 and the second cell 120 can operate in the first scheduling mode such that the resource elements allocated with data and the resource elements allocated with ZP CSI-RS do not overlap with each other in the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2. Hereinafter, the first cell 110 and the second cell 120 operating in the first scheduling mode will be described.

[0075] In the exemplary embodiment, in order to prevent multiple data / ZP CSI-RS from being allocated to any resource element, the second cell 120 can schedule the resource elements RE_7 to RE_12 corresponding to the frequency domain of the ZP CSI-RS allocated to the second PDSCH PDSCH_2 so as not to overlap with the first PDSCH PDSCH_1. Additionally, in order to prevent ZP CSI-RS / data from being allocated to any resource element, the first cell 110 can also schedule the resource elements corresponding to the frequency domain of the ZP CSI-RS allocated to the first PDSCH PDSCH_1 so as not to overlap with the second PDSCH PDSCH_2. Additionally, as an exemplary embodiment, the first cell 110 and the second cell 120 can perform scheduling as Figure 3C shown such that the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 do not entirely overlap with each other.

[0076] Referring to Figure 1 and Figure 8B , the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 can overlap on the first resource element RE_1 to the sixth resource element RE_6. The first cell 110 and the second cell 120 can operate in the second scheduling mode such that in the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2, the second resource element RE_2 and the fifth resource element RE_5 not allocated with data overlap with the second resource element RE_2 and the fifth resource element RE_5 allocated with ZP CSI-RS. Hereinafter, the first cell 110 and the second cell 120 operating in the second scheduling mode will be described.

[0077] In an exemplary embodiment, the first cell 110 may not allocate data to the second resource element RE_2 and the fifth resource element RE_5 of the ZP CSI-RS to which the second PDSCH PDSCH_2 is allocated. The first cell 110 may rate-match non-data to the second resource element RE_2 and the fifth resource element RE_5. The first cell 110 may perform the above operations by obtaining scheduling information about the resource elements to which the ZP CSI-RS is allocated from the second cell 120 in advance. The terminal 100 may perform a rate-matching operation on the non-data / ZP CSI-RS allocated to the second resource element RE_2 and the fifth resource element RE_5. Similar to the first cell 110, the second cell 120 may not allocate data to the resource elements of the ZP CSI-RS to which the first PDSCH PDSCH_1 is allocated.

[0078] By processing the multiple data / data allocated to the first resource element RE_1 based on demodulation corresponding to a specific modulation method and by processing the non-data / ZP CSI-RS allocated to the second resource element RE_2 based on relatively simple rate matching, compared with Figure 7 the terminal 100 may reduce the processing complexity of the terminal 100. In the following, the processing operations for the third resource element RE_3 to the sixth resource element RE_6 are the same as those for the first resource element RE_1 and the second resource element RE_2, and thus, their repeated descriptions will not be given herein.

[0079] Referring to Figure 1 and Figure 8C , the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 may overlap on the first resource element RE_1 to the sixth resource element RE_6. The first cell 110 and the second cell 120 may operate in a third scheduling mode, in which multiple data / data are allocated to the first resource element RE_1, the third resource element RE_3, the fourth resource element RE_4, and the sixth resource element RE_6, and multiple data / ZP CSI-RS are allocated to the second resource element RE_2 and the fifth resource element RE_5. In the following, the first cell 110 and the second cell 120 operating in the third scheduling mode will be described.

[0080] In an example embodiment, the first cell 110 may allocate data to the second resource element RE_2 and the fifth resource element RE_5 of the ZP CSI-RS to which the second PDSCH PDSCH_2 is allocated. The terminal 100 may perform demodulation operations on the data / data allocated to the first resource element RE_1, the third resource element RE_3, the fourth resource element RE_4, and the sixth resource element RE_6, respectively, and may process the multiple data / ZP CSI-RS allocated to the second resource element RE_2 and the fifth resource element RE_5 in a heterogeneous manner such as demodulation operations and rate matching. The second cell 120 may also allocate data to the resource elements of the ZP CSI-RS to which the first PDSCH PDSCH_1 is allocated.

[0081] After confirming that the terminal 100 can support heterogeneous processing for data / ZP CSI-RS, the first cell 110 and the second cell 120 may operate in a third scheduling mode. In some example embodiments, even when it is confirmed that the terminal 100 can support all types of processing, the first cell 110 and the second cell 120 may, according to the communication environment, Figure 8A operate in a first scheduling mode of Figure 8B or a second scheduling mode of

[0082] Figure 9 is a diagram for describing the operation of the terminal when the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 overlap each other. Hereinafter, it is assumed that the terminal schedules the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 such that rate matching can be performed in units of resource blocks, but the example embodiments are not limited thereto. Even when rate matching is performed with various resource units, the example embodiments can be applied.

[0083] Referring to Figure 1 and Figure 9 , the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 may overlap on the first resource block RB_1 to the sixth resource block RB_6. The data not subject to rate matching may be referred to as RM_NT. The data subject to rate matching may be referred to as RM_T. RM_NT / RM_NT may be allocated to the first resource block RB_1, the third resource block RB_3, the fourth resource block RB_4, and the sixth resource block RB_6, and RM_NT / RM_T may be allocated to the second resource block RB_2 and the fifth resource block RB_5. RM_NT may include multiple data to be subject to demodulation operations, and RM_T may include non-data to be subject to rate matching.

[0084] The terminal 100 may perform a first processing operation PC_13 on the RM_NT / RM_NT allocated to the first resource block RB_1. More specifically, the terminal 100 may demodulate the RM_NT / RM_NT allocated to the first resource block RB_1 respectively by a demodulation method corresponding to the modulation method. Subsequently, the terminal 100 may perform a second processing operation PC_23 on the RM_NT / RM_T allocated to the second resource block RB_2. For example, in the RM_NT / RM_T allocated to the second resource block RB_2, the terminal 100 demodulates the RM_NT by a demodulation method corresponding to 256QAM, and may perform rate matching on the RM_T. In summary, the terminal 100 may process the RM_NT allocated to the second resource block RB_2 in a first manner and process the RM_T allocated to the second resource block RB_2 in a second manner.

[0085] That is, since the first processing operation PC_13 and the second processing operation PC_23 have different processing methods and the terminal 100 needs to quickly change the processing method to perform the second processing operation PC_23 on the second resource block RB_2, this change may be a factor increasing the processing complexity of the terminal 100. In addition, in the case of the second processing operation PC_23, since each of the RM_NT / RM_T is processed in a heterogeneous manner, the terminal 100 may not support the second processing operation PC_23. This problem may occur when performing a processing operation on the fifth resource block RB_5.

[0086] Hereinafter, the third processing operation PC_33 to the sixth processing operation PC_63 on the third resource block RB_3 to the sixth resource block RB_6 are the same as the above-mentioned first processing operation PC_13 and second processing operation PC_23, and thus, repeated descriptions thereof will not be given herein.

[0087] The first cell 110 and the second cell 120 according to the exemplary embodiment may reduce the processing complexity of the terminal 100 and operate in a scheduling mode corresponding to the performance of the terminal 100, which will be described later below.

[0088] Figures 10A to 10C is a diagram for describing the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 in multiple scheduling modes according to the exemplary embodiment.

[0089] Refer to Figure 1 and Figure 10A, the first cell 110 and the second cell 120 can operate in the first scheduling mode such that the resource blocks allocated with RM_NT and the resource blocks allocated with RM_T do not overlap with each other in the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2. Hereinafter, the first cell 110 and the second cell 120 operating in the first scheduling mode will be described.

[0090] In an exemplary embodiment, to prevent RM_NT / RM_T from being allocated to any resource blocks, the second cell 120 can schedule the second resource block RB_2 and the fifth resource block RB_5 corresponding to the frequency domain of the RM_T allocated to the second PDSCH PDSCH_2 so as not to overlap with the first PDSCH PDSCH_1. Additionally, to prevent RM_T / RM_NT from being allocated to any resource blocks, the first cell 110 can also schedule the resource blocks corresponding to the frequency domain of the RM_T allocated to the first PDSCH PDSCH_1 so as not to overlap with the second PDSCH PDSCH_2.

[0091] Additionally, as an exemplary embodiment, the first cell 110 and the second cell 120 can perform scheduling as Figure 3C shown such that the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 do not entirely overlap with each other.

[0092] Referring to Figure 1 and Figure 10B , the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 can overlap on the first resource block RB_1 to the sixth resource block RB_6. The first cell 110 and the second cell 120 can operate in the second scheduling mode such that in the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2, the second resource block RB_2 and the fifth resource block RB_5 allocated with RM_T overlap with the second resource block RB_2 and the fifth resource block RB_5 allocated with RM_T. Hereinafter, the first cell 110 and the second cell 120 operating in the second scheduling mode will be described.

[0093] In an exemplary embodiment, the first cell 110 can allocate RM_T to the second resource block RB_2 and the fifth resource block RB_5 of the RM_T allocated to the second PDSCH PDSCH_2. The first cell 110 can perform the above operation by obtaining in advance from the second cell 120 the scheduling information about the resource blocks allocated with RM_T. The terminal 100 can perform a rate matching operation on the RM_T / RM_T allocated to the second resource block RB_2 and the fifth resource block RB_5. Similar to the first cell 110, the second cell 120 can also allocate RM_T to the resource blocks of the RM_T allocated to the first PDSCH PDSCH_1.

[0094] By performing processing on RM_NT / RM_NT assigned to the first resource block RB_1 based on demodulation corresponding to a specific modulation method and by performing processing on RM_T / RM_T assigned to the second resource block RB_2 based on relatively simple rate matching, compared with Figure 9 the terminal 100 can reduce the processing complexity of the terminal 100. In the following, the processing operations on the third resource block RB_3 to the sixth resource block RB_6 are the same as those on the first resource block RB_1 and the second resource block RB_2, and thus, their repeated descriptions will not be given herein.

[0095] Referring to Figure 1 and Figure 10C , the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 can overlap on the first resource block RB_1 to the sixth resource block RB_6. The first cell 110 and the second cell 120 can operate in the third scheduling mode. In the third operation mode, RM_NT / RM_NT is assigned to the first resource block RB_1, the third resource block RB_3, the fourth resource block RB_4, and the sixth resource block RB_6, and RM_NT / RM_T is assigned to the second resource block RB_2 and the fifth resource block RB_5. In the following, the first cell 110 and the second cell 120 operating in the third scheduling mode will be described.

[0096] In an exemplary embodiment, the first cell 110 can assign RM_NT to the second resource block RB_2 and the fifth resource block RB_5 where RM_T of the second PDSCH PDSCH_2 is assigned. The terminal 100 can perform demodulation operations on RM_NT / RM_NT assigned to the first resource block RB_1, the third resource block RB_3, the fourth resource block RB_4, and the sixth resource block RB_6 respectively, and can process RM_NT / RM_T assigned to the second resource block RB_2 and the fifth resource block RB_5 in a heterogeneous manner such as demodulation operations and rate matching respectively. The second cell 120 can also assign data to the resource block where RM_T of the first PDSCH PDSCH_1 is assigned.

[0097] After confirming that the terminal 100 can support heterogeneous processing of RM_NT / RM_T, the first cell 110 and the second cell 120 can operate in the third scheduling mode. In some exemplary embodiments, even when it is confirmed that the terminal 100 can support various types of processing, the first cell 110 and the second cell 120 can also operate in Figure 10A the first scheduling mode of Figure 10B or the second scheduling mode of

[0098] In addition, in the exemplary embodiment, the first cell 110 and the second cell 120 may limit the number of resource blocks allocated to RM_NT / RM_T or RM_T / RM_NT. For example, the first cell and the second cell operate based on a third scheduling mode, and when the number of resource blocks allocated to RM_NT / RM_T or RM_T / RM_NT exceeds a threshold, they may operate in the Figure 10A first scheduling mode or Figure 10B the second scheduling mode. The threshold may be adjusted according to the performance of the terminal 100, and when the number of resource blocks allocated to RM_NT / RM_T or RM_T / RM_NT exceeds the threshold, the terminal 100 may notify the first cell 110 and the second cell 120 of this. In some exemplary embodiments, even without a notification from the terminal 100, the first cell 110 and the second cell 120 may operate in the Figure 10A first scheduling mode or Figure 10B the second scheduling mode by self-identifying that the number of resource blocks allocated to RM_NT / RM_T or RM_T / RM_NT exceeds the threshold.

[0099] According to the exemplary embodiment, the first cell 110 and the second cell 120 may perform the scheduling operations of the first PDSCH PDSCH_1 and the second PDSCH PDSCH_2 by adjusting the value of the DCI field according to the Figures 10A to 10C shown multiple scheduling modes.

[0100] Figure 11 is a flowchart showing a method of operating a wireless communication system according to an exemplary embodiment.

[0101] Referring to Figure 11 , in operation S200, the first cell and the second cell may exchange corresponding PDSCH scheduling information. In operations S210 and S212, the terminal may send performance information to the first cell and the second cell, respectively. In operations S220 and S222, the first cell and the second cell may respectively select the scheduling mode of the first PDSCH and the scheduling mode of the second PDSCH based on the performance of the terminal. In operations S230 and S232, the first cell and the second cell may respectively send the first PDSCH and the second PDSCH scheduled in the selected scheduling mode to the terminal. In operation S240, the terminal may perform a processing operation on the overlapping resources of the first PDSCH and the second PDSCH.

[0102] Figures 12A to 12C is a diagram showing a method of operating a wireless communication system 20 according to an exemplary embodiment.

[0103] Referring to Figure 12A, the wireless communication system 20 may include a terminal 200 and first to third cells 410 to 430. The first to third cells 410 to 430 may select a first scheduling mode SC_MODE_1 to schedule first to third PDSCHs PDSCH_1 to PDSCH_3 based on the first scheduling mode SC_MODE_1, and then transmit the first to third PDSCHs PDSCH_1 to PDSCH_3 to the terminal 200. The first scheduling mode SC_MODE_1 has been described with reference to Figure 6A , Figure 8A and Figure 10A . Considering that multiple data / data or RM_NT / RM_NT are allocated to resources where the first to third PDSCHs PDSCH_1 to PDSCH_3 overlap, the terminal 200 may perform processing (e.g., joint detection) on the overlapping resources. In some example embodiments, considering that the overlapping resources are not included in the first to third PDSCHs PDSCH_1 to PDSCH_3, the terminal 200 may perform general processing.

[0104] With reference to Figure 12B , the first to third cells 410 to 430 may select a second scheduling mode SC_MODE_2 to schedule first to third PDSCHs PDSCH_1 to PDSCH_3 based on the second scheduling mode SC_MODE_2, and then transmit the first to third PDSCHs PDSCH_1 to PDSCH_3 to the terminal 200. The second scheduling mode SC_MODE_2 has been described with reference to Figure 6B , Figure 8B and Figure 10B . Considering that non-data / PTRS or non-data / ZP CSI-RS or RM_T / RM_T are allocated to the overlapping resources in the first to third PDSCHs PDSCH_1 to PDSCH_3, the terminal 200 may perform processing (e.g., rate matching) on the overlapping resources.

[0105] With reference to Figure 12C , the first to third cells 410 to 430 may select a third scheduling mode SC_MODE_3 to schedule first to third PDSCHs PDSCH_1 to PDSCH_3 based on the third scheduling mode SC_MODE_3, and then transmit the first to third PDSCHs PDSCH_1 to PDSCH_3 to the terminal 200. The third scheduling mode SC_MODE_3 has been described with reference to Figure 6C , Figure 8C and Figure 10CThe third scheduling mode SC_MODE_3 is described, and considering that data / PTRS or data / ZP CSI-RS or RM_NT / RM_T is allocated to overlapping resources among the first PDSCH PDSCH_1 to the third PDSCH PDSCH_3, the terminal 200 can perform processing (e.g., modulation operation and rate matching) on the overlapping resources.

[0106] Figure 13 is a block diagram of an electronic device 1000 according to an exemplary embodiment.

[0107] Referring to Figure 13 , the electronic device 1000 may include a memory 1010, a processor unit 1020, an input / output controller 1040, a display unit 1050, an input device 1060, and a communication processor 1090. Here, a plurality of memories 1010 may be included. These components will be discussed in more detail below.

[0108] The memory 1010 may include a program storage unit 1011 for storing programs for controlling the operation of the electronic device and a data storage unit 1012 for storing data generated during program execution. The data storage unit 1012 may store data required for the operation of the application program 1013 and the data processing program 1014. The program storage unit 1011 may include the application program 1013 and the data processing program 1014. Here, the programs included in the program storage unit 1011 are a set of instructions, which may be represented as an instruction set. The application program 1013 includes application programs running on the electronic device. That is, the application program 1013 may include instructions of applications driven by the processor 1022.

[0109] The electronic device 1000 may include a communication processor 1090 that performs communication functions for voice communication and data communication. In the exemplary embodiment, the communication processor 1090 may include a radio frequency integrated circuit (RFIC) and a plurality of antennas, and the RFIC may receive a PDSCH from a plurality of cells based on a scheduling mode selected from among a plurality of scheduling modes related to the rate matching of the PDSCH. According to the exemplary embodiment, the data processing program 1014 may include instructions driven by the processor 1022 (or a baseband processor) to perform processing on the PDSCH based on a scheduling mode selected from among a plurality of scheduling modes. That is, the processor 1022 may perform operations based on the data processing program 1014. Details regarding this are described in Figures 1 to 12C and will be omitted below.

[0110] The peripheral device interface 1023 can control the connection between the input / output peripheral devices of the cell and the processor 1022 and the memory interface 1021. The processor 1022 uses at least one software program to control multiple cells to provide corresponding services. The processor 1022 can execute at least one program stored in the memory 1010 to provide services corresponding to the program.

[0111] The input / output controller 1040 can provide an interface between input / output devices such as the display unit 1050 and the input device 1060 and the peripheral device interface 1023. The display unit 1050 (which may include a display panel) displays status information, input characters, moving pictures, still pictures, etc. For example, the display unit 1050 can display application program information driven by the processor 1022.

[0112] The input device 1060 can provide input data generated by the selection of the electronic device to the processor unit 1020 through the input / output controller 1040. The input device 1060 can include a keyboard and a touchpad. The keyboard includes at least one hardware button, and the touchpad is used to sense touch information. For example, the input device 1060 can include a touch layer disposed above the display panel of the display unit 1050. For example, the input device 1060 can provide touch information such as touch, touch movement, and touch release sensed by the touchpad to the processor 1022 through the input / output controller 1040.

[0113] Although the example embodiments have been specifically shown and described, it will be understood that various forms and details changes can be made to the example embodiments without departing from the spirit and scope of the claims.

Claims

1. A wireless communication system, comprising: a first cell configured to communicate with a second cell and a terminal, wherein the first cell includes a processor configured to control the first cell: select one of a plurality of scheduling modes related to rate matching of a physical downlink shared channel based on control information exchanged with the second cell and performance information received from the terminal indicating whether the terminal supports heterogeneous processing operations; and transmit a first physical downlink shared channel to the terminal according to the selected scheduling mode, while the second cell transmits a second physical downlink shared channel to the terminal according to the selected scheduling mode, and wherein the terminal is configured to perform processing on the first physical downlink shared channel and the second physical downlink shared channel based on the selected scheduling mode.

2. The wireless communication system according to claim 1, wherein the processor of the first cell is further configured to perform scheduling with the second cell based on selecting a first scheduling mode from the plurality of scheduling modes, wherein: resources corresponding to a phase tracking reference signal or an aperiodic zero-power channel state information-reference signal included in the first physical downlink shared channel do not overlap with resources corresponding to data included in the second physical downlink shared channel, and resources corresponding to a phase tracking reference signal or an aperiodic zero-power channel state information-reference signal included in the second physical downlink shared channel do not overlap with resources corresponding to data included in the first physical downlink shared channel.

3. The wireless communication system according to claim 1, wherein the processor of the first cell is further configured to perform scheduling with the second cell based on selecting a second scheduling mode from the plurality of scheduling modes, wherein: data is not allocated to resources among the resources of the first physical downlink shared channel that overlap with a first resource corresponding to a phase tracking reference signal or an aperiodic zero-power channel state information-reference signal included in the second physical downlink shared channel, and data is not allocated to resources among the resources of the second physical downlink shared channel that overlap with a second resource corresponding to a phase tracking reference signal or an aperiodic zero-power channel state information-reference signal included in the first physical downlink shared channel.

4. The wireless communication system according to claim 3, wherein the terminal is configured to perform a rate matching operation on the first resource and the second resource.

5. The wireless communication system according to claim 1, wherein the processor of the first cell is further configured to perform scheduling with the second cell based on selecting a third scheduling mode from the plurality of scheduling modes, wherein: Allocate first data to a resource among the resources of the first physical downlink shared channel that overlaps with a first resource, where the first resource corresponds to a phase-tracking reference signal or an aperiodic zero-power channel state information-reference signal included in the second physical downlink shared channel, and Allocate second data to a resource among the resources of the second physical downlink shared channel that overlaps with a second resource, where the second resource corresponds to a phase-tracking reference signal or an aperiodic zero-power channel state information-reference signal included in the first physical downlink shared channel.

6. The wireless communication system according to claim 5, wherein, the terminal is configured to perform the heterogeneous processing operation on the first resource and the second resource.

7. The wireless communication system according to claim 6, wherein, the heterogeneous processing operation includes processing the phase-tracking reference signal or the aperiodic zero-power channel state information-reference signal in the first resource and the second resource in a first manner, and processing the first data and the second data in a second manner.

8. The wireless communication system according to claim 1, wherein, the processor of the first cell is further configured to perform scheduling with the second cell based on selecting a first scheduling mode from among the multiple scheduling modes, where the resource blocks rate-matched for the first physical downlink shared channel do not overlap with the resource blocks rate-matched for the second physical downlink shared channel.

9. The wireless communication system according to claim 1, wherein, the processor of the first cell is further configured to perform scheduling with a second cell based on selecting a second scheduling mode from among the multiple scheduling modes, where: do not allocate data to a first resource block among the resource blocks of the first physical downlink shared channel that overlaps with the resource blocks rate-matched for the second physical downlink shared channel, and do not allocate data to a second resource block among the resource blocks of the second physical downlink shared channel that overlaps with the resource blocks rate-matched for the first physical downlink shared channel.

10. The wireless communication system according to claim 1, wherein, the processor of the first cell is further configured to perform scheduling with the second cell based on selecting a third scheduling mode from among the multiple scheduling modes, where: allocate data to a first resource block among the resource blocks of the first physical downlink shared channel that overlaps with the resource blocks rate-matched for the second physical downlink shared channel, and allocate data to a second resource block among the resource blocks of the second physical downlink shared channel that overlaps with the resource blocks rate-matched for the first physical downlink shared channel.

11. The wireless communication system according to claim 1, wherein, the processor of the first cell is further configured to control the first cell to send a downlink control indicator indicating the selected scheduling mode to the terminal, or set the selected scheduling mode through upper layer signaling with the terminal.

12. A terminal, comprising: A radio frequency integrated circuit configured to receive a first physical downlink shared channel from a first cell and a second physical downlink shared channel from a second cell based on a scheduling mode selected from a plurality of scheduling modes related to rate matching of a physical downlink shared channel; and A processor configured to perform processing on the first physical downlink shared channel and the second physical downlink shared channel based on the selected scheduling mode, wherein the selected scheduling mode is selected based on performance information indicating whether the terminal supports heterogeneous processing operations of the terminal.

13. The terminal according to claim 12, wherein, The processor is further configured to perform the heterogeneous processing operation on a resource allocated with a phase-tracking reference signal or an aperiodic zero-power channel state information-reference signal that overlaps with a resource allocated with data in the physical downlink shared channel.

14. The terminal according to claim 12, wherein, The processor is further configured to perform a homogeneous processing operation on a resource allocated with a phase-tracking reference signal or an aperiodic zero-power channel state information-reference signal that overlaps with a resource allocated with non-data in the physical downlink shared channel.

15. The terminal according to claim 14, wherein, The homogeneous processing operation includes a rate matching operation.

16. The terminal according to claim 12, wherein, The processor is further configured to send a signal indicating a processing method that can be supported to the first cell and the second cell through the radio frequency integrated circuit.

17. A method of operating a first cell of a wireless communication system, the wireless communication system including the first cell, a second cell, and a terminal, the method comprises: Selecting, by the first cell, one of a plurality of scheduling modes related to rate matching of a physical downlink shared channel based on control information exchanged with the second cell and performance information received from the terminal indicating whether the terminal supports heterogeneous processing operations; and Sending, by the first cell, a first physical downlink shared channel to the terminal according to the selected scheduling mode, while the second cell sends a second physical downlink shared channel to the terminal according to the selected scheduling mode, wherein the terminal performs processing on the first physical downlink shared channel and the second physical downlink shared channel based on the selected scheduling mode.

18. The method according to claim 17, wherein, The step of selecting one of the plurality of scheduling modes includes: Obtaining, by the first cell, scheduling information from the second cell; and Selecting, by the first cell, one of the plurality of scheduling modes based on the performance information and the scheduling information.

19. The method according to claim 18, further comprises: Sending, by the first cell, a downlink control indicator indicating the selected scheduling mode to the terminal, or setting the selected scheduling mode by the first cell through upper layer signaling with the terminal.

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