KR20200087060A - Method and apparatus for resource allocation for network coordination - Google Patents

Abstract

The present invention relates to a communication technique for fusing a 5^th generation (5G) communication system or a pre-5G communication system with an IoT technology to support a higher data transmission rate than that of a 4^th generation (4G) communication system like long term evolution (LTE) and a system thereof. The present invention can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.) based on a 5G communication technology and an IoT-related technology. According to various embodiments of the present invention, provided are a method for allocating time and frequency resources for smoothly providing a service and an apparatus thereof. According to the present invention, a control signal processing method in a wireless communication system comprises the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

Description

Resource allocation method for network cooperative communication{METHOD AND APPARATUS FOR RESOURCE ALLOCATION FOR NETWORK COORDINATION}

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for allocating time and frequency resources to smoothly provide a service.

Efforts have been made to develop an improved 5G communication system or a pre-5G communication system to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a 4G network (Beyond 4G Network) communication system or an LTE system (Post LTE) or later system.

To achieve high data rates, 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, 60 gigahertz (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive array multiple input/output (massive MIMO), full dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, to improve the network of the system, in the 5G communication system, the evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, mobile network, cooperative communication, coordinated multi-points (CoMP), and interference cancellation Technology development is being made. In addition, in the 5G system, advanced coding modulation (Advanced Coding Modulation (ACM)) Hybrid FSK and QAM Modulation (FQAM) and sliding window superposition coding (SWSC), advanced access technology FBMC (Filter Bank Multi Carrier), NOMA (non orthogonal multiple access), and SCMA (sparse code multiple access) are being developed.

5G systems are considering supporting various services compared to existing 4G systems. For example, the most typical services include mobile enhanced broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive inter-device communication service (mMTC: massive) machine type communication), and next-generation broadcast service (eMBMS: evolved multimedia broadcast/multicast Service). In addition, the system providing the URLLC service may be referred to as a URLLC system, and the system providing an eMBB service may be referred to as an eMBB system. Also, the terms service and system can be used interchangeably.

Among them, URLLC service is a service that is newly considered in 5G system unlike the existing 4G system, and has a very high reliability (for example, packet error rate of about 10-5) and low latency (for example, compared to other services). Satisfies the condition of about 0.5 msec). In order to satisfy these strict requirements, the URLLC service may need to apply a transmission time interval (TTI) shorter than the eMBB service, and various operation methods utilizing the same are being considered.

Meanwhile, the Internet is evolving from a human-centered connection network where humans generate and consume information, to an Internet of Things (IoT) network that exchanges information between distributed components such as objects. Internet of Everything (IoE) technology is also emerging, in which big data processing technology, such as connecting to a cloud server, is combined with IoT technology. In order to implement IoT, technical elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, a machine to machine (Machine to Machine) , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects to create new values in human life may be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, high-tech medical service through convergence and complex between existing IT (information technology) technology and various industries. It can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, 5G communication technology such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) is implemented by techniques such as beamforming, MIMO, and array antenna. It is. It may be said that the application of cloud radio access network (cloud RAN) as the big data processing technology described above is an example of 5G technology and IoT technology convergence.

One embodiment of the present invention is to provide a time and frequency resource allocation method and apparatus for smoothly providing a service in a wireless communication system.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. Will be able to.

The present invention for solving the above problems is a method for processing a control signal in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the base station.

According to an embodiment of the present invention, time and frequency resources can be efficiently allocated in a wireless communication system.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description. will be.

1 is a view showing a time-frequency domain transmission structure of the LTE, LTE-A, NR or similar wireless communication system of the present invention.
2 is a diagram illustrating a frame, subframe, and slot structure in 5G of the present invention.
3 shows an example of a partial configuration of a bandwidth according to an embodiment of the present invention.
4 is a diagram illustrating an example of a partial indication and change of a bandwidth according to an embodiment of the present invention.
5 is a diagram illustrating an example of setting a control region of a downlink control channel according to an embodiment of the present invention.
6 is a diagram illustrating an example of PDSCH frequency axis resource allocation according to an embodiment of the present invention.
7 is a diagram illustrating an example of time-domain resource allocation of NR according to an embodiment of the present invention.
8 is a diagram illustrating an example of time axis resource allocation according to a subcarrier interval of a data channel and a control channel according to an embodiment of the present invention.
9 is a diagram illustrating a base station and a terminal protocol stack when performing single cell, carrier aggregation, and dual connectivity according to an embodiment of the present invention.
10 is a diagram illustrating an example of a cooperative communication antenna port configuration and resource allocation according to an embodiment of the present invention.
11 is a diagram illustrating an example of a DCI configuration for cooperative communication according to an embodiment of the present invention.
12 is a diagram illustrating an example of a stepwise FD-RA according to an embodiment of the present invention.
13 is a diagram illustrating a PDCCH monitoring occasion according to a PDSCH mapping type according to an embodiment of the present invention.
14 is a diagram illustrating a method of monitoring two or more PDSCHs according to an embodiment of the present invention.
15 is a diagram illustrating another example of a method of monitoring two or more PDSCHs according to an embodiment of the present invention.
16 is a block diagram showing the structure of a terminal according to an embodiment of the present invention.
17 is a block diagram showing the structure of a base station according to an embodiment of the present invention.
18 is a diagram illustrating an example of a bitmap for RBG-TRP relationship and RBG allocation according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents well known in the technical field to which the present invention pertains and which are not directly related to the present invention will be omitted. This is to more clearly communicate the subject matter of the present invention by omitting unnecessary description.

For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. The same reference numbers are assigned to the same or corresponding elements in each drawing.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments of the present disclosure allow the present disclosure to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

At this time, it will be understood that each block of the process flow chart diagrams and combinations of flow chart diagrams can be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that instructions performed through a processor of a computer or other programmable data processing equipment are described in flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer readable or computer readable memory that can be oriented to a computer or other programmable data processing equipment to implement a function in a particular way, so that computer readable or computer readable memory It is also possible that the instructions stored in produce a manufacturing item containing instruction means for performing the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so a series of operational steps are performed on a computer or other programmable data processing equipment to create a process that is executed by the computer to generate a computer or other programmable data. It may also be possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block(s).

Also, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function(s). It should also be noted that in some alternative implementations, it is also possible that the functions mentioned in the blocks occur out of sequence. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

At this time, the term'~ unit' used in this embodiment means software or hardware components such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and'~ unit' performs certain roles. do. However,'~bu' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium or may be configured to reproduce one or more processors. Accordingly, according to some embodiments,'~ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, and pros. Scissors, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The functions provided within components and'~units' may be combined into a smaller number of components and'~units', or further separated into additional components and'~units'. In addition, the components and'~ unit' may be implemented to play one or more CPUs in the device or secure multimedia card. Also, according to some embodiments,'~ unit' may include one or more processors.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification. Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, it is not limited to the above example.

Hereinafter, the present disclosure describes a technique for a terminal to receive broadcast information from a base station in a wireless communication system. The present invention relates to a communication technique and a system for integrating 5G communication system with IoT technology to support a higher data rate after a 4G system. The present disclosure is based on 5G communication technology and IoT related technologies, such as intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety related services, etc.) ).

Terms used in the following description, terms referring to control information, terms related to communication coverage (coverage), terms referring to a change in state (eg, an event), and network entities The term referring, the term referring to the message, the term referring to the component of the device, etc. are exemplified for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

For convenience of description below, some terms and names defined in the 3GPP 3rd generation partnership project long term evolution (LTE) standard may be used. However, the present invention is not limited by the terms and names, and may be applied to systems conforming to other standards.

The wireless communication system deviates from providing an initial voice-oriented service, for example, 3GPP's High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced Broadband radio that provides high-speed, high-quality packet data services such as (LTE-A), LTE-Pro, 3GPP2 High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e. It is developing as a communication system.

As a representative example of a broadband wireless communication system, an LTE system adopts an Orthogonal Frequency Division Multiplexing (OFDM) method in a downlink (DL), and a Single Carrier Frequency Division Multiple Access (SC-FDMA) in an uplink (UL). ) Method is adopted. Uplink refers to a radio link through which a user equipment (UE) or a mobile station (MS) transmits data or control signals to a base station (eNode B, or base station (BS)). A radio link that transmits data or control signals. In the multiple access method described above, data or control information of each user is distinguished by assigning and operating so that time-frequency resources to be loaded with data or control information for each user do not overlap each other, that is, orthogonality is established. .

As a future communication system after LTE, that is, a 5G communication system must be able to freely reflect various requirements such as users and service providers, so services satisfying various requirements must be supported. Services considered for 5G communication systems include Enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communciation (URLLC). And so on.

According to some embodiments, the eMBB aims to provide an improved data transmission rate than the data transmission rates supported by the existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, an eMBB should be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the perspective of one base station. At the same time, the actual perceived data rate of the increased terminal should be provided. In order to satisfy these requirements, it is required to improve transmission/reception technology, including a more advanced Multi Input Multi Output (MIMO) transmission technology. Also, instead of the 2GHz band used by the current LTE, it is possible to satisfy the data transmission rate required by the 5G communication system by using a wider bandwidth than 20MHz in the 3-6GHz or 6GHz or higher frequency band.

At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC may require access to a large-scale terminal within a cell, improved coverage of the terminal, improved battery time, and reduced cost of the terminal. Since the Internet of Things is attached to various sensors and various devices and provides communication functions, it must be able to support a large number of terminals (for example, 1,000,000 terminals/km ² ) in a cell. In addition, because of the nature of the service, the terminal supporting mMTC is likely to be located in a shaded area that cannot be covered by a cell, such as the basement of a building, and thus may require more coverage than other services provided by a 5G communication system. A terminal supporting mMTC should be configured as a low-cost terminal, and since it is difficult to frequently replace the battery of the terminal, a very long battery life time may be required.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for a specific purpose (mission-critical), such as remote control for robots or machinery, industrial automation, It is a service used for unmanned aerial vehicles, remote health care, emergency alerts, etc., and must provide communication providing ultra low latency and ultra reliability. For example, a service supporting URLLC must satisfy air interface latency less than 0.5 milliseconds, and at the same time, has a requirement of a packet error rate of 10-5 or less. Therefore, for a service supporting URLLC, a 5G system needs to provide a smaller transmit time interval (TTI) than other services, and at the same time, a design requirement is required to allocate a wide resource in the frequency band. However, the above-described mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-described examples.

The services considered in the above-mentioned 5G communication system should be provided by being fused with each other on the basis of one framework. That is, for efficient resource management and control, it is preferable that each service is integrated and controlled and transmitted as one system rather than being operated independently.

In addition, hereinafter, an embodiment of the present invention will be described as an example of an LTE, LTE-A, LTE Pro or NR system, but the embodiment of the present invention may be applied to other communication systems having similar technical backgrounds or channel types. In addition, the embodiments of the present invention can be applied to other communication systems through some modifications within a range that does not depart significantly from the scope of the present invention as judged by a skilled person.

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

FIG. 1 is a diagram showing the basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in the 5G system of the present invention.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(Resource Block, RB, 1-04)을 구성할 수 있다. In Fig. 1, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domain is a resource element (RE, 1-01), 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol (1-02) on the time axis and 1 subcarrier (1) on the frequency axis ( 1-03). In the frequency domain

(Example 12) consecutive REs may constitute one resource block (Resource Block, RB, 1-04).

2 is a view showing a slot structure considered in the 5G system of the present invention.

)=14). 1 서브프레임(2-01)은 하나 또는 다수 개의 슬롯(2-02, 2-03)으로 구성될 수 있으며, 1 서브프레임(2-01)당 슬롯(2-02, 2-03)의 개수는 부반송파 간격에 대한 설정 값 μ(2-04, 2-05)에 따라 다를 수 있다. 도 2의 일 예에서는 부반송파 간격 설정 값으로 μ=0(2-04)인 경우와 μ=1(2-05)인 경우가 도시되어 있다. μ=0(2-04)일 경우, 1 서브프레임(2-01)은 1개의 슬롯(2-02)으로 구성될 수 있고, μ=1(2-05)일 경우, 1 서브프레임(2-01)은 2개의 슬롯(2-03)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 [표 1]로 정의될 수 있다.2 shows an example of a frame (Frame, 2-00), a subframe (Subframe, 2-01), a slot (Slot, 2-02) structure. One frame (2-00) may be defined as 10 ms. One subframe 2-01 may be defined as 1 ms, so one frame 2-00 may consist of a total of 10 subframes 2-01. One slot (2-02, 2-03) may be defined by 14 OFDM symbols (ie, the number of symbols per slot (

)=14). 1 subframe (2-01) may be composed of one or a plurality of slots (2-02, 2-03), the number of slots (2-02, 2-03) per subframe (2-01) May be different depending on the set value μ(2-04, 2-05) for the subcarrier interval. In the example of FIG. 2, the case where the subcarrier spacing is set is μ=0(2-04) and μ=1(2-05). When μ=0(2-04), one subframe 2-01 may consist of one slot 2-02, and when μ=1(2-05), one subframe 2 -01) may consist of two slots (2-03). That is, the number of slots per subframe according to the set value μ for the subcarrier interval (

) May vary, so the number of slots per frame (

) May vary. According to each subcarrier spacing setting μ

And

Can be defined as [Table 1] below.

[Table 1]

In NR, one component carrier (CC) or serving cell may be composed of up to 250 or more RBs. Therefore, when the terminal always receives the entire serving cell bandwidth, such as LTE, the power consumption of the terminal may be extreme, and to solve this, the base station sets one or more bandwidth parts (BWP, bandwidth part) to the terminal so that the terminal is within the cell It is possible to support changing the reception area. In NR, the base station may set the'initial BWP', which is the bandwidth of CORESET #0 (or common search space, CSS) to the terminal through the MIB. Thereafter, the base station may set the initial BWP (first BWP) of the terminal through RRC signaling and may notify at least one or more BWP configuration information that may be indicated through DCI in the future. Thereafter, the base station can indicate which band the UE will use by notifying the BWP ID through DCI. If the UE cannot receive DCI from the currently allocated BWP for a specific time or more, the UE returns to the'default BWP' and tries to receive DCI.

3 is a diagram illustrating an example of setting for a bandwidth portion in a 5G communication system according to an embodiment of the present invention.

FIG. 3 shows an example in which the terminal bandwidth (3-00) is set to two bandwidth portions, namely, the bandwidth portion #1 (3-05) and the bandwidth portion #2 (3-10). The base station may set one or a plurality of bandwidth portions to the terminal, and may set information of [Table 2] below for each bandwidth portion.

[Table 2]

In addition to the setting information, various parameters related to the bandwidth part may be set to the terminal. The information may be transmitted to the terminal by the base station through higher layer signaling, for example, RRC signaling. At least one bandwidth portion among the set one or multiple bandwidth portions may be activated. Whether to activate the set bandwidth part may be transmitted semi-statically through RRC signaling from the base station to the terminal, or may be dynamically delivered through a MAC control element (CE) or DCI.

The bandwidth portion supported by the 5G communication system can be used for various purposes.

For example, when the bandwidth supported by the terminal is smaller than the system bandwidth, the bandwidth may be supported through the partial bandwidth setting. For example, by setting the frequency location (setting information 1) of the bandwidth portion in Table 2 to the terminal, the terminal can transmit and receive data at a specific frequency location within the system bandwidth.

As another example, for the purpose of supporting different numerology, the base station may set a plurality of bandwidth portions to the terminal. For example, in order to support data transmission and reception using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to a certain terminal, two bandwidth portions may be set to use subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth parts can be FDM, and when data is to be transmitted/received at a specific subcarrier interval, a bandwidth part set at a corresponding subcarrier interval can be activated.

As another example, for the purpose of reducing power consumption of the terminal, the base station may set a bandwidth portion having different sizes of bandwidth to the terminal. For example, if the terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz, and always transmits/receives data with the corresponding bandwidth, it may cause very large power consumption. In particular, in a situation where there is no traffic, it is very inefficient in terms of power consumption for the UE to perform monitoring of an unnecessary downlink control channel for a large bandwidth of 100 MHz. Therefore, for the purpose of reducing the power consumption of the terminal, the base station can set a bandwidth portion of a relatively small bandwidth to the terminal, for example, a bandwidth portion of 20 MHz. In the absence of traffic, the terminal can perform a monitoring operation in the 20 MHz bandwidth portion, and when data occurs, can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

4 is a diagram showing a method for dynamically changing a bandwidth portion according to an embodiment of the present invention.

As described in [Table 2], the base station can set one or multiple bandwidth parts to the terminal, and the bandwidth for the bandwidth part, the frequency location for the bandwidth part, and the neurology for the bandwidth part can be set for each bandwidth part. Information can be provided. In FIG. 4, two bandwidth parts, bandwidth part #1 (BPW#1, 4-05) and bandwidth part #2 (BWP#2, 4-10) are set in a terminal bandwidth (4-00). Here is an example. One or more bandwidth portions may be activated among the set bandwidths, and an example in which one bandwidth portion is activated in FIG. 4 is considered. In FIG. 4, among the bandwidth parts set in slot #0 (4-25), bandwidth part #1 (4-02) is activated and the terminal is a control area # set in bandwidth part #1 (4-05). PDCCH can be monitored at 1 (4-45), and data (4-55) can be transmitted and received at bandwidth part #1 (4-05). Depending on which bandwidth portion is activated among the set bandwidth portions, a control region in which the UE receives the PDCCH may be different, and accordingly, a bandwidth in which the UE monitors the PDCCH may vary.

The base station may further transmit an indicator for changing the setting for the bandwidth portion to the terminal. Here, changing the setting for the bandwidth portion may be considered the same as an operation of activating a specific bandwidth portion (eg, changing the activation from the bandwidth portion A to the bandwidth portion B). The base station can transmit a configuration switching indicator to the terminal in a specific slot, and the terminal receives the configuration change indicator from the base station and then determines the portion of the bandwidth to be activated by applying the changed setting according to the configuration change indicator from a specific point in time. And it is possible to perform monitoring for the PDCCH in the control region set in the active bandwidth portion.

In FIG. 4, the base station transmits a configuration change indicator (Configuration Switching Indication, 4-15) instructing the UE to change the active bandwidth portion from the existing bandwidth portion #1 (4-05) to the bandwidth portion #2 (4-10). Can be transmitted in slot #1 (4-30). After receiving the corresponding indicator, the terminal may activate the bandwidth part #2 (6-10) according to the content of the indicator. At this time, a transition time (4-20) for changing the bandwidth portion may be required, and accordingly, a time point of changing and applying the activated bandwidth portion may be determined. 4 shows a case in which a transition time (4-20) of 1 slot is required after receiving the setting change indicator 4-15. During the transition time, data transmission and reception may not be performed (4-60). Accordingly, the bandwidth part #2 (4-10) is activated in slot #2 (4-35), and an operation of transmitting and receiving a control channel and data to the corresponding bandwidth part may be performed.

The base station may preset one or more bandwidth portions to the UE as upper layer signaling (for example, RRC signaling), and enable the configuration change indicator 4-15 to be mapped to one of the preset bandwidth portion settings by the base station. Can be instructed. For example, an indicator of log ₂ N bits may select and indicate one of the N preset bandwidth portions. [Table 3] below shows an example of indicating configuration information for a bandwidth part using a 2-bit indicator.

[Table 3]

The setting change indicator 4-15 for the bandwidth part described above is a base station in the form of medium access control (MAC) control element (CE) signaling or L1 signaling (eg, common DCI, group-common DCI, terminal-specific DCI). It can be delivered to the terminal.

From the point in time at which the bandwidth portion activation is applied according to the setting change indicator 4-15 for the bandwidth portion described above is followed. From which point the setting change will be applied depends on a predefined value (e.g., applied from N (≥1) slots after receiving the setting change indicator), or the base station sets the terminal to higher layer signaling (e.g., RRC signaling) or Or, it may be included in the content of the setting change indicator 4-15 and transmitted. Or a combination of the above methods. After receiving the setting change indicator 4-15 for the bandwidth part, the terminal can apply the changed setting from the time obtained by the above method.

Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the drawings.

5 is a view showing an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system according to an embodiment of the present invention.

In FIG. 5, two control regions (control region #1 (5-01), control region #2 (5-02)) in the bandwidth portion (5-10) of the terminal on the frequency axis and in one slot (5-20) on the time axis. ) Shows an example that is set. The control regions 5-01 and 5-02 may be set to a specific frequency resource 5-03 within the entire terminal bandwidth portion 5-10 on the frequency axis. As the time axis, one or more OFDM symbols may be set, and this may be defined as a control resource set duration (5-04). In the example of FIG. 5, control region #1 (5-01) is set to a control region length of 2 symbols, and control region #2 (5-02) is set to a control region length of 1 symbol.

The control region in 5G described above may be set by the base station to the UE through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling). Setting a control region to a terminal means providing information such as a control region identifier, a frequency location of the control region, and a symbol length of the control region. For example, it may include the information in [Table 4].

[Table 4]

In Table 4, tci-StatesPDCCH (simply referred to as TCI state) setting information is one or a number of Synchronization Signal (SS)/PBCH (SSC) in a Quasi Co Located (QCL) relationship with DMRS transmitted in the corresponding control region. Physical Broadcast Channel (Block) index or CSI-RS (Channel State Information Reference Signal) index.

Below, time and frequency resource allocation methods for data transmission in NR are described.

In addition to the frequency axis resource candidate allocation through the BWP indication, the NR provides detailed frequency domain resource allocation (FD-RA) methods.

6 is a diagram illustrating an example of PDSCH frequency axis resource allocation according to an embodiment of the present invention.

6 is a diagram showing three frequency axis resource allocation methods that can be set through an upper layer in NR: type 0 (6-00), type 1 (6-05), and dynamic switch (6-10).

If the UE is configured to use only resource type 0 through higher layer signaling (6-00), some DCI (downlink control information, downlink control information) for allocating PDSCH to the UE is composed of N _RBG bits. Have a map The conditions for this will be explained again later. At this time, N _RBG means the number of resource block groups (RBGs) determined as shown in [Table 5] according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size, indicated by 1 by the bitmap Data is transmitted to the RBG.

[Table 5]

개의 비트들로 구성되는 주파수 축 자원 할당 정보를 가진다. 이를 위한 조건은 차후 다시 설명한다. 기지국은 이를 통하여 starting VRB(virtual RB)(6-20)와 이로부터 연속적으로 할당되는 주파수 축 자원의 길이(6-25)를 설정하는 것이 가능하다. 상기 각각의 VRB는 특정 규칙을 통하여 PRB와 1:1 맵핑된다.If the UE is configured to use only resource type 1 through higher layer signaling (6-05), some DCIs (downlink control information, downlink control information) that allocate PDSCH to the UE are

It has frequency axis resource allocation information composed of 4 bits. The conditions for this will be explained again later. Through this, the base station can set the starting virtual RB (VRB) 6-20 and the length (6-25) of the frequency axis resources continuously allocated therefrom. Each VRB is mapped 1:1 with the PRB through specific rules.

If the UE is configured to use both resource type 0 and resource type 1 through higher layer signaling (6-10), some DCI (downlink control information, downlink control information) for allocating PDSCH to the UE is the resource. Frequency axis resource allocation information consisting of bits of a large value (6-35) among payload (6-15) for setting type 0 and payload (6-20, 6-25) for setting resource type 1 Have The conditions for this will be explained again later. At this time, one bit is added to the first part (MSB) of the frequency axis resource allocation information in the DCI to indicate that resource type 0 is used when 0, and if 1, resource type 1 is used.

7 is a diagram illustrating an example of time-domain resource allocation of NR according to an embodiment of the present invention.

,

), scheduling offset(K₀) 값 그리고 DCI를 통하여 동적으로 지시되는 한 slot 내 OFDM symbol 시작 위치(7-00)와 길이(7-05)에 따라 PDSCH 자원의 시간 축 위치를 지시하는 것이 가능하다.Referring to FIG. 7, the base station has a subcarrier interval of a data channel and a control channel that are set in a higher layer (

,

), scheduling offset (K ₀ ) value, and it is possible to indicate the time axis position of the PDSCH resource according to the OFDM symbol start position (7-00) and length (7-05) in one slot dynamically indicated through DCI. .

8 is a diagram illustrating an example of time axis resource allocation according to a subcarrier interval of a data channel and a control channel according to an embodiment of the present invention.

) data와 control의 slot number가 같으므로 기지국 및 단말은 미리 정해진 slot offset K₀에 맞추어 scheduling offset이 발생함을 알 수 있다. 반면, data channel 및 control channel의 서브캐리어 간격이 다른 경우(8-05,

) data와 control의 slot number가 다르므로 기지국 및 단말은 PDCCH의 서브캐리어 간격을 기준으로 하여 미리 정해진 slot offset K₀에 맞추어 scheduling offset이 발생함을 알 수 있다.Referring to FIG. 8, when the subcarrier intervals of the data channel and the control channel are the same (8-00,

) Since the slot number of data and control are the same, the base station and the terminal can know that a scheduling offset occurs according to a predetermined slot offset K ₀ . On the other hand, when the data channel and the control channel have different subcarrier intervals (8-05,

) Since the slot number of data and control are different, the base station and the terminal can know that a scheduling offset occurs according to a predetermined slot offset K ₀ based on the subcarrier interval of the PDCCH.

NR provides various types of DCI (downlink control information) format as shown in [Table 6] below for efficient control channel reception of the terminal.

[Table 6]

For example, the base station may use DCI format 0_0 or DCI format 0_1 to allocate PDSCH to one cell (scheduling).

DCI format 0_1 includes at least the following information when transmitted with a CRC scrambled by a Cell Radio Network Temporary Identifier (C-RNTI) or a Configured Scheduling RNTI (CS-RNTI) or a new-RNTI:

● Identifier for DCI formats(1 bits): DCI format indicator, always set to 1

bits): 주파수 축 자원 할당을 지시하며, DCI format 1_0이 UE specific search space에서 모니터 되는 경우

는 active DL BWP의 크기이며, 이외의 경우

는 initial DL BWP의 크기이다. N_RBG 는 resource block group의 숫자이다. 상세 방법은 상기 주파수 축 자원 할당을 참조한다.● Frequency domain resource assignment (N _RBG bits or

bits): indicates the frequency axis resource allocation, and when DCI format 1_0 is monitored in the UE specific search space

Is the size of the active DL BWP, and in other cases

Is the size of the initial DL BWP. N _RBG is a number of resource block groups. For details, refer to the frequency axis resource allocation.

● Time domain resource assignment (0~4 bits): Instructs time axis resource allocation according to the above description.

● VRB-to-PRB mapping (1 bit): 0 indicates Non-interleaved, and 1 indicates interleaved VRP-to-PRB mapping.

● Modulation and coding scheme (5 bits): indicates the modulation order and coding rate used for PDSCH transmission.

● New data indicator (1 bit): indicates whether PDSCH is initially transmitted or retransmitted according to whether it is toggled.

● Redundancy version (2 bits): indicates the redundancy version used for PDSCH transmission.

● HARQ process number (4 bits): indicates the HARQ process number used for PDSCH transmission.

● Downlink assignment index (2 bits): DAI indicator

● TPC command for scheduled PUCCH (2 bits): PUCCH power control indicator

● PUCCH resource indicator (3 bits): PUCCH resource indicator, indicating one of 8 resources set as a higher layer.

● PDSCH-to-HARQ_feedback timing indicator (3 bits): HARQ feedback timing indicator, indicating one of eight feedback timing offsets set as a higher layer.

DCI format 1_1 includes at least the following information when transmitted with a CRC scrambled by a Cell Radio Network Temporary Identifier (C-RNTI) or a Configured Scheduling RNTI (CS-RNTI) or a new-RNTI:

● Identifier for DCI formats(1 bit): DCI format indicator, always set to 1

● Carrier indicator (0 or 3 bits): indicates the CC (or cell) to which the PDSCH allocated by the corresponding DCI is transmitted.

● Bandwidth part indicator (0 or 1 or 2 bits): indicates the BWP on which the PDSCH allocated by the corresponding DCI is transmitted.

는 active DL BWP의 크기이다. 상세 방법은 상기 주파수 축 자원 할당을 참조한다.● Frequency domain resource assignment (determine payload according to the frequency axis resource allocation): indicates frequency axis resource allocation,

Is the size of the active DL BWP. For details, refer to the frequency axis resource allocation.

● Time domain resource assignment (0 to 4 bits): Instructs time axis resource allocation according to the above description.

● VRB-to-PRB mapping (0 or 1 bit): 0 indicates non-interleaved, and 1 indicates interleaved VRP-to-PRB mapping. If the frequency axis resource allocation is set to resource type 0, it is 0 bit.

● PRB bundling size indicator (0 or 1 bit): 0 bit when the upper layer parameter prb-BundlingType is not set or is set to'static', and 1 bit when set to'dynamic'.

● Rate matching indicator (0 or 1 or 2 bits): indicates the rate matching pattern.

● ZP CSI-RS trigger (0 or 1 or 2 bits): an indicator that triggers the aperiodic ZP CSI-RS.

● For transport block 1:

■ Modulation and coding scheme (5 bits): indicates the modulation order and coding rate used for PDSCH transmission.

■ New data indicator (1 bit): indicates whether the PDSCH is the initial transmission or the retransmission depending on whether toggle.

■ Redundancy version (2 bits): indicates the redundancy version used for PDSCH transmission.

● For transport block 2:

■ Modulation and coding scheme (5 bits): indicates the modulation order and coding rate used for PDSCH transmission.

■ New data indicator (1 bit): indicates whether the PDSCH is the initial transmission or the retransmission depending on whether toggle.

■ Redundancy version (2 bits): indicates the redundancy version used for PDSCH transmission.

● HARQ process number (4 bits): indicates the HARQ process number used for PDSCH transmission.

● Downlink assignment index (0 or 2 or 4 bits): DAI indicator

● TPC command for scheduled PUCCH (2 bits): PUCCH power control indicator

● PUCCH resource indicator (3 bits): PUCCH resource indicator, indicating one of 8 resources set as a higher layer.

● PDSCH-to-HARQ_feedback timing indicator (3 bits): HARQ feedback timing indicator, indicating one of eight feedback timing offsets set as a higher layer.

● Antenna port (4 or 5 or 6 bits): DMRS port and CDM group without data are indicated.

● Transmission configuration indication (0 or 3 bits): TCI indicator.

● SRS request(2 or 3 bits): SRS transmission request indicator

● CBG transmission information (0 or 2 or 4 or 6 or 8 bits): an indicator indicating whether to transmit code block groups in the assigned PDSCH. 0 means that the corresponding CBG is not transmitted, and 1 means that it is transmitted.

● CBG flushing out information (0 or 1 bit): An indicator that indicates whether or not the previous CBGs are contaminated.

● DMRS sequence initialization (0 or 1 bit): DMRS scrambling ID selection indicator

The maximum number of DCIs of different sizes that a UE can receive per slot in a corresponding cell is 4. The maximum number of DCIs of different sizes that are scrambled with C-RNTIs that can be received per slot in a corresponding cell is up to 3.

9 is a diagram illustrating a base station and a terminal radio protocol structure when performing single cell, carrier aggregation, and dual connectivity according to an embodiment of the present invention.

Referring to FIG. 9, the radio protocols of the next generation mobile communication system are NR Service Data Adaptation Protocol 9-25, 9-70 (SDAP) and NR Packet Data Convergence Protocol 9-30, 9-65 at the terminal and the NR base station, respectively. ), NR RLC (Radio Link Control 9-35, 9-60), NR MAC (Medium Access Control 9-40, 9-55).

The main functions of the NR SDAP (9-25, 9-70) may include some of the following functions.

-Transfer of user plane data

-Mapping function between QoS flow and data bearer for uplink and downlink (mapping between a QoS flow and a DRB for both DL and UL)

-Marking QoS flow ID in both DL and UL packets for uplink and downlink

-Reflective QoS flow to DRB mapping for the UL SDAP PDUs for uplink SDAP PDUs.

For the SDAP layer device, the UE can set whether to use the header of the SDAP layer device or the function of the SDAP layer device, for each PDCP layer device, for each bearer, or for each logical channel, as an RRC message, and the SDAP header When is set, the NAS QoS reflection setting 1-bit indicator (NAS reflective QoS) of the SDAP header and the AS QoS reflection setting 1-bit indicator (AS reflective QoS) allow the UE to map the uplink and downlink QoS flow and mapping information for the data bearer. You can instruct it to update or reset. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used as data processing priority and scheduling information to support a smooth service.

The main functions of the NR PDCP (9-30, 9-65) may include some of the following functions.

-Header compression and decompression (ROHC only)

-Transfer of user data

-In-sequence delivery of upper layer PDUs

-Out-of-sequence delivery of upper layer PDUs

-Reordering function (PDCP PDU reordering for reception)

-Duplicate detection of lower layer SDUs

-Retransmission of PDCP SDUs

-Encryption and decryption function (Ciphering and deciphering)

-Timer-based SDU discard function (Timer-based SDU discard in uplink.)

In the above, the order reordering function of the NR PDCP device (reordering) refers to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN), and transmitting data to a higher layer in the rearranged order. It may include or, without considering the order, may include a function to immediately deliver, may include a function to record the lost PDCP PDUs by rearranging the order, and report the status of the lost PDCP PDUs It may include a function for transmitting to the sender, and may include a function for requesting retransmission for lost PDCP PDUs.

The main functions of NR RLC (9-35, 9-60) may include some of the following functions.

-Data transfer function (Transfer of upper layer PDUs)

-In-sequence delivery of upper layer PDUs

-Out-of-sequence delivery of upper layer PDUs

-ARQ function (Error Correction through ARQ)

-Concatenation, segmentation and reassembly of RLC SDUs

-Re-segmentation of RLC data PDUs

-Reordering of RLC data PDUs

-Duplicate detection function

-Protocol error detection

-RLC SDU deletion function (RLC SDU discard)

-RLC re-establishment

In the above, the in-sequence delivery of the NR RLC device refers to a function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and one RLC SDU is originally divided into multiple RLC SDUs and received. If it is, it may include a function to reassemble and deliver it, and may include a function to rearrange the received RLC PDUs based on RLC sequence number (SN) or PDCP sequence number (SN). It may include a function of recording lost RLC PDUs, may include a function of reporting a status of lost RLC PDUs to a transmitting side, and a function of requesting retransmission of lost RLC PDUs. If there is a lost RLC SDU, it may include a function of forwarding only the RLC SDUs up to the previous layer in order until the lost RLC SDU, or if a predetermined timer expires even if there is a lost RLC SDU It may include a function of delivering all RLC SDUs received before the start to the upper layer in order, or if a predetermined timer expires even if there is a missing RLC SDU, all RLC SDUs received so far to the upper layer in order. It can include the ability to deliver. In addition, the RLC PDUs can be processed in the order in which they are received (regardless of the sequence number and sequence number, in order of arrival) and delivered to the PDCP device in any order (out-of sequence delivery). Thereafter, segments that are stored in a buffer or to be received at a later time can be received, reconstructed into a single RLC PDU, processed, and then transmitted to a PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

In the above, out-of-sequence delivery of the NR RLC device refers to a function of directly transmitting RLC SDUs received from a lower layer to an upper layer regardless of order, and one RLC SDU originally has multiple RLCs. When divided and received into SDUs, it may include a function of reassembling it and transmitting it, and may include a function of storing RLC SNs or PDCP SNs of received RLC PDUs and arranging the order to record lost RLC PDUs. Can.

NR MAC (9-40, 9-55) may be connected to several NR RLC layer devices configured in one terminal, the main function of the NR MAC may include some of the following functions.

-Mapping function (Mapping between logical channels and transport channels)

-Multiplexing/demultiplexing of MAC SDUs

-Scheduling information reporting function

-HARQ function (Error correction through HARQ)

-Priority handling between logical channels (Priority handling between logical channels of one UE)

-Priority handling between UEs (Priority handling between UEs by means of dynamic scheduling)

-MBMS service identification function

-Transport format selection function

-Padding function

The NR PHY layers (9-45, 9-50) channel-code and modulate upper layer data, make OFDM symbols and transmit them on a wireless channel, or demodulate and channel decode OFDM symbols received over a wireless channel to the upper layer. You can perform the transfer operation.

The detailed structure of the radio protocol structure may be changed according to a carrier (or cell) operation method. For example, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure having a single structure for each layer, such as 9-00. On the other hand, when a base station transmits data to a terminal based on carrier aggregation (CA) using multiple carriers in a single TRP, the base station and the terminal have a single structure up to RLC as in 9-10, but multiplex the PHY layer through the MAC layer. Protocol structure. As another example, when a base station transmits data to a terminal based on dual connectivity (DC) using multiple carriers in multiple TRPs, the base station and the terminal have a single structure up to RLC as in 9-20, but PHY through the MAC layer. A protocol structure for multiplexing layers is used.

In LTE and NR, the terminal has a procedure of reporting capability supported by the terminal to the corresponding base station while connected to the serving base station. In the following description, this is referred to as UE capability (reporting). The base station may transmit a UE capability enquiry message requesting capability reporting to a terminal in a connected state. In the message, the base station may include a request for UE capability for each RAT type. The request for each RAT type may include requested frequency band information. In addition, the UE capability enquiry message may request a plurality of RAT types from one RRC message container, or may include a UE capability enquiry message including a request for each RAT type multiple times and transmit it to the terminal. That is, the UE capability inquiry is repeated a plurality of times, and the terminal may report a plurality of times by constructing a corresponding UE capability information message. In the next-generation mobile communication system, UE capability requests for MR-DC including NR, LTE, and EN-DC can be made. For reference, the UE capability inquiry message is generally sent initially after the terminal establishes a connection, but can be requested under any condition when the base station is needed.

In the step, the terminal receiving the UE capability report request from the base station configures the terminal capability according to the RAT type and band information requested from the base station. In the NR system, a method of configuring UE capability in the UE is summarized below.

One. If the UE is provided with a list of LTE and/or NR bands by requesting UE capability from the base station, the UE configures a band combination (BC) for EN-DC and NR stand alone (SA). That is, a candidate list of BC for EN-DC and NR SA is constructed based on bands requested by the FreqBandList from the base station. Also, the priority of the bands has priority in the order described in FreqBandList.

2. If the base station sets the "eutra-nr-only" flag or the "eutra" flag to request UE capability reporting, the UE completely removes the NR SA BCs from the configured BC candidate list. This operation can occur only when the LTE base station (eNB) requests “eutra” capability.

3. Thereafter, the terminal removes fallback BCs from the candidate list of BCs configured in the step. Here, fallback BC corresponds to a case in which a band corresponding to at least one SCell is removed from a super set BC, and can be omitted because the super set BC can already cover the fallback BC. This step also applies to MR-DC, that is, LTE bands. The remaining BC after this stage is the final “candidate BC list”.

4. The terminal selects BCs to report by selecting BCs corresponding to the requested RAT type in the final “candidate BC list”. In this step, the terminal configures the supportedBandCombinationList in a predetermined order. That is, the terminal configures BC and UE capabilities to be reported according to a preset order of rat-type. (nr -> eutra-nr -> eutra). Also, configure featureSetCombination for the configured supportedBandCombinationList, and construct a list of “candidate feature set combinations” from the candidate BC list where the list for fallback BC (which contains the same or lower level capability) is removed. The “candidate feature set combination” includes both feature set combinations for NR and EUTRA-NR BC, and can be obtained from feature set combinations of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

5. Also, if the requested rat type is eutra-nr and has an effect, featureSetCombinations are included in two containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the feature set of NR includes only UE-NR-Capabilities.

After the terminal capability is configured, the terminal transmits a UE capability information message including the UE capability to the base station. The base station then performs appropriate scheduling and transmission/reception management for the corresponding terminal based on the UE capability received from the terminal.

Referring to the descriptions related to the PDSCH transmission/reception procedure such as the DCI structure, PDSCH time/frequency resource allocation, radio protocol structure, and the like, in release 15, NR is focused on allocating PDSCH transmitted from a single transmission point and transmitted from multiple points. In the case of cooperative communication in which one UE receives PDSCH, additional standard support is required. For example, since the control information includes one frequency axis and time axis resource allocation information corresponding to one PDSCH, it is necessary to expand or process the information to allocate two or more PDSCHs.

In the present invention, cooperative communication efficiency is improved by providing a time and frequency resource allocation method for efficiently allocating the multiple PDSCHs to a single UE.

Hereinafter, embodiments of the present invention will be described in detail together with the accompanying drawings. In addition, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, the base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In addition, NR or LTE/LTE-A system will be described below as an example, but embodiments of the present invention may be applied to other communication systems having similar technical backgrounds or channel types. In addition, the embodiments of the present invention may be applied to other communication systems through some modifications within a range not departing significantly from the scope of the present invention as judged by a skilled technical person.

The content in the present invention is applicable to FDD and TDD systems.

Hereinafter, in the present invention, high-level signaling is a signal transmission method that is transmitted from a base station to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer, RRC signaling, or PDCP signaling. Or, it may be referred to as a MAC (medium access control) control element (MAC control element; MAC CE).

Hereinafter, in the present invention, in determining whether to apply cooperative communication, the UE has a specific format in which PDCCH(s) allocating PDSCH to which cooperative communication is applied or PDCCH(s) allocating PDSCH to which cooperative communication is applied is cooperative. PDCCH(s) allocating a PDSCH to which the cooperative communication is applied is scrambled with a specific RNTI, or a cooperative communication application is assumed in a specific section indicated by a higher layer. It is possible to use various methods. Hereinafter, for convenience of description, the UE receives the PDSCH to which the cooperative communication is applied based on conditions similar to the above will be referred to as an NC-JT case.

Hereinafter, in the present invention, determining priority between A and B selects one having a higher priority according to a predetermined priority rule and performs an operation corresponding thereto or omits an operation having a lower priority ( omit or drop).

Hereinafter, in the present invention, the above examples are described through a number of embodiments, but these are not independent ones, and it is possible that one or more embodiments are applied simultaneously or in combination.

<First embodiment: Multiple DCI reception for NC-JT>

The 5G wireless communication system can support not only services requiring a high transmission speed, but also services having a very short transmission delay and services requiring a high connection density. In a wireless communication network including a plurality of cells, a transmission and reception point (TRP), or a beam, coordinated transmission between each cell, TRP, and/or beam increases the strength of a signal received by the terminal or each cell, It is one of the element technologies that can satisfy the various service requirements by efficiently performing TRP or/and inter-beam interference control.

Joint transmission (JT) is a representative transmission technology for the cooperative communication. Through the above technology, one terminal can be supported through different cells, TRP, and/or beams to increase the strength of a signal received by the terminal. . On the other hand, since each cell, TRP or/and the channel between the beam and the terminal may have significantly different characteristics, different precoding, MCS, resource allocation, etc. need to be applied to the link between the cell, the TRP or/and the beam and the terminal. . In particular, each cell, TRP, or/ for non-coherent joint transmission (NC-JT) supporting non-coherent precoding between each cell, TRP or/and beam. And individual DL transmission information for beams becomes important. Meanwhile, individual DL transmission information setting for each cell, TRP, and/or beam is a major factor in increasing payload required for DL DCI transmission, which adversely affects reception performance of a physical downlink control channel (PDCCH) transmitting DCI. Can go crazy. Therefore, it is necessary to carefully design a tradeoff between DCI information amount and PDCCH reception performance for JT support.

FIG. 10 is a diagram illustrating radio resource allocation examples for each TRP according to a joint transmission (JT) technique and situation according to an embodiment of the present invention.

10 to 10-00 are diagrams showing coherent joint transmission (C-JT) supporting coherent precoding between cells, TRP, and/or beams. In C-JT, the same data (PDSCH) is transmitted from TRP A (10-05) and TRP B (10-10), and joint precoding is performed in multiple TRPs. This means that TRP A (10-05) and TRP B (10-10) transmit the same DMRS ports for receiving the same PDSCH (for example, DMRS ports A and B in both TRPs). In this case, the UE will receive one DCI information for receiving one PDSCH demodulated by DMRS ports A and B.

10 to 10-20 illustrate non-coherent joint transmission (NC-JT) supporting non-coherent precoding between each cell, TRP, and/or beam. It is a drawing. In the case of NC-JT, different PDSCHs are transmitted in each cell, TRP or/and beam, and individual precoding may be applied to each PDSCH. This allows TRP A (10-25) and TRP B (10-30) to transmit different DMRS ports for receiving the different PDSCHs (for example, DMRS port A in TRP A and DMRS port B in TRP B). It means being. In this case, the UE will receive two types of DCI information for receiving PDSCH A demodulated by DMRS port A and PDSCH B demodulated by another DMRS port B.

For example, in the case of NC-JT, the frequency and time resources used by multiple TRPs are the same according to FIG. 5B (10-40), and the frequency and time resources used by multiple TRPs do not overlap at all (10-45) ), it is possible to consider various radio resource allocations, such as a case where some of the frequency and time resources used by multiple TRPs overlap (10-50). In particular, in the case of 10-50, it can be seen that the DCI payload required for resource allocation information increases linearly with the number of TRP. This DL DCI payload increase has a risk of adversely affecting reception performance of a physical downlink control channel (PDCCH) transmitting DCI or significantly increasing the DCI blind decoding complexity of the UE as described above. Therefore, the present invention provides a PDSCH time and frequency resource allocation method for efficiently supporting NC-JT.

For NC-JT support, DCIs of various forms, structures, and relationships may be considered to simultaneously allocate multiple PDSCHs to one UE.

11 is a diagram illustrating four examples of DCI design for NC-JT support according to an embodiment of the present invention.

In FIG. 11, case #1 (11-00) is different from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than serving TRP (TRP#0) used when transmitting a single PDSCH. An example in which (N-1) PDSCHs are transmitted, control information for PDSCHs transmitted in the additional TRP is transmitted in the same format (same DCI format) as control information for PDSCHs transmitted in the serving TRP. . That is, the terminals are PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through DCIs having the same DCI format and the same payload (DCI#0 to DCI#(N-1)). Acquire control information for the fields. The case #1 has an advantage in that each PDSCH control (assignment) degree of freedom is completely guaranteed, but when each DCI is transmitted in a different TRP, a coverage difference for each DCI occurs, and thus reception performance may be deteriorated.

In FIG. 11, case #2 (11-05) is different from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than serving TRP (TRP#0) used when transmitting a single PDSCH. In a situation where (N-1) PDSCHs are transmitted, the control information for the PDSCH transmitted in the additional TRP is transmitted in a different form (different DCI format or different DCI payload) from the control information for the PDSCH transmitted in the serving TRP. Show an example. For example, in the case of DCI#0 transmitting control information for PDSCH transmitted from serving TRP (TRP#0), all information elements of DCI format 1_0 to DCI format 1_1 are included, but cooperative TRP (TRP#1 to TRP) In the case of'shortened' DCIs (sDCI#0 to sDCI#(N-2)) transmitting control information for PDSCHs transmitted from #(N-1)), among the information elements of the DCI format 1_0 to DCI format 1_1 It may contain only a part. Therefore, in the case of sDCI that transmits control information for PDSCHs transmitted from the cooperative TRP, payload is small compared to normal DCI (nDCI), which transmits PDSCH-related control information transmitted from the serving TRP, or is reserved by the number of bits less than nDCI. It is possible to include bits. The case #2 has a disadvantage in that the degree of freedom of each PDSCH control (assignment) can be limited according to the contents of the information element included in the sDCI, but the reception performance of the sDCI is superior to that of the nDCI, so the probability of occurrence of coverage difference for each DCI is low. It has the advantage of losing.

In FIG. 11, case #3 (11-10) is different from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than serving TRP (TRP#0) used when transmitting a single PDSCH. In a situation where (N-1) PDSCHs are transmitted, the control information for the PDSCH transmitted in the additional TRP is transmitted in a different form (different DCI format or different DCI payload) from the control information for the PDSCH transmitted in the serving TRP. Another example is shown. For example, in the case of DCI#0 transmitting control information for PDSCH transmitted from serving TRP (TRP#0), all information elements of DCI format 1_0 to DCI format 1_1 are included, and cooperative TRP (TRP#1 to TRP) In the case of control information on PDSCHs transmitted in #(N-1)), it is possible to collect and transmit only a part of the information elements of DCI format 1_0 to DCI format 1_1 in one'secondary' DCI (sDCI). For example, the sDCI may have at least one of HARQ related information such as frequency domain resource assignment, time domain resource assignment, and MCS of cooperative TRPs. For information not included in sDCI, such as BWP indicator or carrier indicator, it is possible to follow DCI (DCI#0, normal DCI, nDCI) of serving TRP. The case #3 has a disadvantage in that the degree of freedom of each PDSCH control (assignment) can be limited according to the contents of the information element included in the sDCI, but the reception performance of the sDCI can be adjusted and the DCI blind of the terminal compared to the case #1 or #2 There is an advantage that the decoding complexity is reduced.

In FIG. 11, case #4 (11-15) is different from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than serving TRP (TRP#0) used when transmitting a single PDSCH. In the case where (N-1) PDSCHs are transmitted, an example of transmitting control information for PDSCHs transmitted from the additional TRP in DCI (long DCI, lDCI) as control information for PDSCHs transmitted from serving TRP is illustrated. do. That is, the UE acquires control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI. The case #4 has an advantage that the DCI blind decoding complexity of the terminal does not increase, but there is a disadvantage in that PDSCH control (assignment) freedom is low, such as a limited number of cooperative TRPs due to a long DCI payload limitation.

In the following description and embodiments, sDCI may refer to various auxiliary DCIs, such as shortened DCI, secondary DCI, or normal DCI (PDI format 1_0 to 1_1 described above) including PDSCH control information transmitted from the cooperative TRP. If not specified, the description is similarly applicable to the various auxiliary DCIs.

In the following descriptions and embodiments, the cases #1, #2, and #3 in which one or more DCIs (PDCCH) are used for NC-JT support are classified into multiple PDCCH-based NC-JTs, and NC-JT support For this, case #4 in which a single DCI (PDCCH) is used is divided into a single PDCCH-based NC-JT.

The following description and embodiments provide detailed allocation methods of time and frequency resources for the multiple PDCCH-based and single PDCCH-based NC-JTs.

In the embodiments of the present invention, “cooperation TRP” may be replaced with various terms such as “cooperation panel” or “cooperation beam” when actually applied.

In the embodiments of the present invention, “when NC-JT is applied” means “when a terminal receives one or more PDSCHs simultaneously from one BWP”, “when a terminal simultaneously receives two or more TCI indications from one BWP” It can be interpreted in various ways depending on the situation, such as “if PDSCH is received,” or “PDSCH received by the terminal is associated with one or more DMRS port groups,” but is used as one expression for convenience of explanation.

In the present invention, the radio protocol structure for NC-JT can be used in various ways according to the TRP deployment scenario. For example, if there is no or little backhaul delay between cooperative TRPs, it is possible to use a structure based on MAC layer multiplexing similar to 9-10 of FIG. 9 (CA-like method). On the other hand, if the backhaul delay between cooperative TRPs is negligibly large (for example, when CSI exchange or cooperative TRP exchange requires more than 2 ms time), similar to 9-20 of FIG. 9, independent of each TRP from the RLC layer It is possible to secure delay-resistant characteristics using a phosphorus structure (DC-like method).

<Second embodiment: FD-RA for NC-JT>

In this embodiment, a frequency domain resource allocation (FD-RA) method considering NC-JT will be described.

According to the above description, the conventional number of bits for a single PDSCH FD-RA may require payload of 15 bits or more according to the number of PRBs in the BWP, and when simply expanding, N>1 PDSCHs are allocated for NC-JT. The number of FD-RA payloads can be more than 15*N bits, which can place a heavy burden on DCI transmission.

To solve this problem, when using the same FD-RA payload as release 15 NR in one PDCCH, the following methods can be used:

● Method 1: In the case of type 0 informing whether or not to allocate resources for a corresponding band through a bitmap for a defined RB group (RBG), it is possible to promise to change the RBG size according to the number of PDSCHs allocated by the corresponding PDCCH. The number of PDSCHs allocated by the corresponding PDCCH is explicitly indicated by a specific field value in DCI transmitted by the corresponding PDCCH or the number or state of TCI state or QCL information in the DCI transmitted by the corresponding PDCCH (for example, how many) Depending on whether QCL information is included/instructed), it may be indicated to the terminal by various methods, such as implicit determination. [Table 7] shows a method for determining an RBG size according to the number of PRBs included in a band when the maximum number of PDSCHs that can be allocated through a single PDSCH is 2 according to UE capability signaling of the UE and setting of a higher layer of the base station. This is an example. Referring to [Table 7], when it can be determined by the above condition or method that the number of PDSCHs allocated by a DCI is one (condition A), according to the upper layer configuration (configuration 1 or configuration 2) of the base station, {2, 4, 8, 16} or {4, 8, 16, 16}. On the other hand, when it can be determined by the above condition or method that the number of PDSCHs allocated by a DCI is two (condition B), the RBG size is doubled compared to a single PDSCH situation according to a higher layer configuration (configuration 1 or configuration 2) of the base station. Increment to use one of {4, 8, 16, 32} or {8, 16, 32, 32}. Through this, FD-RA can be performed on up to two PDSCHs without increasing the conventional FD-RA payload. The above method can be similarly extended when any DCI can allocate three or more PDSCHs. In this method, the entire FD-RA bits are divided into subgroups according to the number of allocated PDSCHs, and it is possible to map to each PDSCH according to the TCI state (or QCL information) signaling order in the DCI.

[Table 7]

에 대한 자원 할당에서 짝수 번째 RBG, 예컨대

는 TRP 0에서 사용하도록 지정되며 홀수 번째 RBG, 예컨대

는 TRP 1에서 사용하도록 지정되는 것이 가능하다. 상기 RBG 중 어떤 RBG가 단말에게 할당되는지는 상술한 DCI 내 RBG 비트맵에 의해 지시될 수 있으며, 해당 RBG 비트맵 사이즈는 release 15 NR과 동일할 수 있다. RBG-TRP 간 관계 및 RBG 할당을 위한 비트맵의 예시는 도 18과 같다. 위 방법은 어떤 DCI가 세 개 이상의 PDSCH를 할당할 수 있는 경우에도 유사하게 확장이 가능하다.Method 1-1: Alternatively, for the RBG, it is possible to assume a fixed TRP allocation for each RBG. For example, n RBGs in a BWP, i.e.

Even RBG in resource allocation for, eg

Is specified for use in TRP 0 and odd-numbered RBGs, such as

It is possible that it is designated for use in TRP 1. Which RBG of the RBGs is allocated to the UE may be indicated by the RBG bitmap in the DCI described above, and the corresponding RBG bitmap size may be the same as release 15 NR. An example of a bitmap for RBG-TRP relationship and RBG allocation is shown in FIG. 18. The above method can be similarly extended when any DCI can allocate three or more PDSCHs.

If using a larger FD-RA payload compared to release 15 NR in one PDCCH, the following methods can be used:

● Method 2: For FD-RA type 0 or type 1, it is possible to promise to change the FD-RA payload size according to the number of PDSCHs allocated by the corresponding PDCCH. The number of PDSCHs allocated by the corresponding PDCCH is explicitly indicated by a specific field value in DCI transmitted by the corresponding PDCCH or the number or state of TCI state or QCL information in the DCI transmitted by the corresponding PDCCH (for example, how many) Depending on whether QCL information is included/instructed), it may be indicated to the terminal by various methods, such as implicit determination. In this method, the RBG size according to the number of PRBs included in the band part is used in the same manner as in the prior art, and the maximum number of PDSCHs that the UE can be allocated through one PDSCH by UE capability signaling of the UE and setting of a higher layer of the BS Accordingly, FD-RA payload is linearly increased to perform different FD-RA on different PDSCHs. At this time, the entire FD-RA bits are divided into subgroups according to the number of assigned PDSCHs, and it is possible to map to each PDSCH according to the TCI state (or QCL information) signaling order in the DCI.

● Method 3: In the case of type 0, which indicates whether to allocate resources for a corresponding band through a bitmap for a defined RB group (RBG), it is possible to select an additional RBG configuration according to the number of PDSCHs allocated by the corresponding PDCCH. . The number of PDSCHs allocated by the corresponding PDCCH is explicitly indicated by a specific field value in DCI transmitted by the corresponding PDCCH or the number or state of TCI state or QCL information in the DCI transmitted by the corresponding PDCCH (for example, how many) Depending on whether QCL information is included/instructed), it may be indicated to the terminal by various methods, such as implicit determination. [Table 8] shows a method for determining an RBG size according to the number of PRBs included in a band when the maximum number of PDSCHs that can be allocated through a single PDSCH is two or more according to UE capability signaling of the UE and higher layer setup of the base station. This is an example. Referring to [Table 8], when it can be determined by the above condition or method that the number of PDSCHs allocated by a DCI is one (condition A), {2, depending on the upper layer configuration (configuration 1 or configuration 2) of the base station. 4, 8, 16} or {4, 8, 16, 16}. On the other hand, if it can be determined by the above condition or method that the number of PDSCHs assigned by a DCI is two (condition B), the newly determined RBG size according to the upper layer configuration (configuration 3 or configuration 4 or …) of the base station (this In the example, one of {4, 8, 16, 32}…) is used. Through this, FD-RA can be performed on two or more PDSCHs while properly increasing the conventional FD-RA payload. In this method, the entire FD-RA bits are divided into subgroups according to the number of allocated PDSCHs, and it is possible to map to each PDSCH according to the TCI state (or QCL information) signaling order in the DCI.

[Table 8]

는 해당 PDCCH 내 DCI가 지시하는 BWP 내 PRB 수 이며, [수학식 2]에서

은 상기 첫 번째 단계(12-10)에서 지시된 VRB length 그리고

은 해당 DCI가 할당하는 PDSCH 수 이다. 도 12에서 VRB들이 연속된 PRB로 구성된 것과 같이 도시 되었으나 이는 설명의 편의를 위한 것이며 실제 PRB와의 맵핑은 미리 정해진 규칙에 따라 다양하게 바뀔 수 있음에 유의하여야 한다.● Method 4: In the case of type 1 informing resource allocation information through the VRB start position and the allocated VRB length, it is possible to reduce FD-RA payload for multiple PDSCHs by introducing stepwise FD-RA. 12 is a diagram illustrating an example of a stepwise FD-RA according to an embodiment of the present invention. Referring to FIG. 12, it is possible to select an FD-RA method having different steps according to the number of PDSCHs allocated by the corresponding PDCCH. The number of PDSCHs allocated by the corresponding PDCCH is explicitly indicated by a specific field value in DCI transmitted by the corresponding PDCCH or the number or state of TCI state or QCL information in the DCI transmitted by the corresponding PDCCH (for example, how many) Depending on whether QCL information is included/instructed), it may be indicated to the terminal by various methods, such as implicit determination. According to FIG. 12, when the number of PDSCHs allocated by the corresponding PDCCH is one, frequency resources are allocated through the FD-RA (12-00) having a single step. On the other hand, if the number of PDSCHs allocated by the corresponding PDCCH is two or more, it is possible to allocate frequency resources through FD-RA (12-05) having two steps. In the two-step FD-RS (12-05), the first step (12-10) indicates information on a union of frequency axis resources occupied by the plurality of PDSCHs based on starting VRB and length. In the two-step FD-RS (12-05), the second step (12-15) sequentially indicates information on each frequency axis resource occupied by the plurality of PDSCHs based on the starting VRB and length. At this time, the payload required in each step is the same as [Equation 1] in the first step (12-10) and [Equation 2] in the second step. In [Equation 1]

Is the number of PRBs in the BWP indicated by DCI in the PDCCH, in [Equation 2]

VRB length indicated in the first step (12-10) and

Is the number of PDSCHs allocated by the DCI. It should be noted that in FIG. 12, VRBs are shown as being composed of consecutive PRBs, but this is for convenience of description and mapping with an actual PRB may be variously changed according to predetermined rules.

[Equation 1]

[Equation 2]

The methods 1 to 4 of this embodiment are not mutually exclusive, and it is possible to cross-support depending on conditions. For example, it may be promised to use method 1 for FD-RA type 0 and method 4 for FD-RA type 1. Various other combinations are possible, but not all possibilities are listed in order not to obscure the point of explanation.

In the case of type 1, which informs resource allocation information through the start position of the VRB and the allocated VRB length, the FD-RA payload is already compressed in the form of indicating the index of the available VRB start position and length combination, so the conventional FD-RA Keeping the payload makes it very difficult to contain additional information. Therefore, the UE indicates the NC-JT operation, that is, DCI that allocates one or more PDSCHs to at least one of the same OFDM symbols has the same FD-RA payload as the FD-RA payload of release 15 NR and uses type 1 FD-RA. In this case, the DCI may promise to understand that all of the one or more PDSCHs are assigned the same FD-RA.

<Example 3: TD-RA for NC-JT>

In this embodiment, a time domain resource allocation (TD-RA) method considering NC-JT will be described.

According to the above description, the number of bits for a conventional single PDSCH TD-RA can be from 0 to 4 bits depending on the setting, and if it is simply extended, FD-RA payload required when allocating N>1 PDSCH for NC-JT The number can be more than 4*N bits. This is not a big increase compared to FD-RA, but in the case of TD-RA, it needs to be carefully designed because it is intertwined with various issues such as DMRS RE pattern, PDCCH monitoring occasion, PDSCH RE mapping, channel estimation, and control channel load balancing.

In consideration of the above problems, it is possible to use at least one of the following three methods for SLIV and PDSCH mapping type among information included in TD-RA.

● Method 1: In this method, when a UE simultaneously receives two or more PDSCHs that share at least some time and frequency resources, implementation complexity for interference management including interference measurement and interference cancellation between the two or more PDSCHs is described. In order to mitigate, both SLIV and PDSCH mapping types for the two or more PDSCHs are matched. In this case, since the UE can be guaranteed the same RE pattern for all PDSCHs to be simultaneously received, the NC-JT reception operation including the interference management is simplified. At this time, in order to simplify the implementation complexity of the UE, “if two or more PDSCHs sharing at least some of the time and frequency resources have different SLIV values or are assigned to have different PDSCH mapping type values, all of these PDSCHs If not received, or “if two or more PDSCHs sharing at least some of the time and frequency resources have different SLIV values or are assigned to have different PDSCH mapping type values, the highest priority among the PDSCHs. You can promise to receive only PDSCHs with”. At this time, the priority between PDSCHs can be determined in various ways, such as PDSCH having the smallest k ₀ value, PDSCH having the smallest TCI state ID, or PDSCH having the smallest HARQ process ID.

● Method 2: In this method, in order to reduce the complexity of UE implementation and to simultaneously distribute the PDCCH transmission burden of the base station (PDCCH load balancing), when the UE simultaneously receives two or more PDSCHs sharing at least some time and frequency resources (PDCCH load balancing) SLIV values for the two or more PDSCHs are matched, but it is possible to allow PDSCH mapping types to have different values. 13 is a diagram illustrating a PDCCH monitoring occasion according to a PDSCH mapping type according to an embodiment of the present invention. Referring to FIG. 13, in the case of PDSCH mapping type A, only the first OFDM symbol in the slot can be designated as a PDCCH monitoring occasion (13-00), whereas in the case of PDSCH mapping type B, all OFDM symbols in the slot are PDCCH monitoring occasion. Can be specified (13-05). This means that it is possible to prevent PDCCH transmission from being concentrated on some symbols in a slot by properly allocating PDSCH mapping types of NC-JT PDSCHs according to network traffic load. This method is particularly suitable for multiple PDCCH-based NC-JTs requiring two or more PDCCH transmissions for NC-JT allocation. At this time, in order to simplify the implementation complexity of the terminal, “if two or more PDSCHs sharing at least some of the time and frequency resources are allocated to have different SLIV values, all of the PDSCHs are not received” or “at least If two or more PDSCHs sharing some time and frequency resources are allocated to have different SLIV values, it can promise to receive only the PDSCH having the highest priority among the PDSCHs.” At this time, the priority between PDSCHs can be determined in various ways, such as PDSCH having the smallest k ₀ value, PDSCH having the smallest TCI state ID, or PDSCH having the smallest HARQ process ID.

● Method 3: In this method, in order to maximize scheduling freedom and throughput performance when a UE simultaneously receives two or more PDSCHs sharing at least some time and frequency resources, SLIV values and PDSCH mapping for the two or more PDSCHs are maximized. There are no type restrictions. In this case, the DMRS RE patterns in the two or more PDSCHs may not match, and the DMRS channel estimation performance may deteriorate due to a collision between the DMRS RE of one PDSCH and the PDSCH RE of the other PDSCH. In order to solve this, when the SLIV values or PDSCH mapping types for the two or more PDSCHs are different, it is necessary to rate-match PDSCH REs located in DMRS REs of different PDSCHs. To this end, when the SLIV value or the PDSCH mapping type for the two or more PDSCHs is different, the UE receives one additional SLIV value and determines the PDSCH for the DMRS RE location determined by linking it with the conventional DMRS port and CDM group without data indication information. Perform RE rate matching” or “Perform PDSCH RE rate matching for the DMRS RE location determined by linking additional SLRS values with additional pair of DMRS port number indication information” or “Applying PDSCH RE rate matching in symbol units DMRS channel estimation for NC-JT PDSCH demodulation by performing PDSCH RE rate matching based on signaling indicating whether or not” or “by performing PDSCH RE rate matching based on a RE-level rate matching signal of release 15 NR” When performing, it may be guaranteed not to perform an additional operation (for example, PDSCH interference cancellation in DMRS RE).

In consideration of the above problems, it is possible to use at least one of the following two methods for k ₀ of the information included in the TD-RA.

● Method 4: In this method, when a UE simultaneously receives two or more PDSCHs that share at least some of the time and frequency resources, processing complexity for processing the two or more PDSCHs is reduced and implementation complexity for PDSCH dropping rules is reduced. In order to match, the k ₀ values for the two or more PDSCHs are all matched. In this case, since the terminal can be guaranteed the same processing time for all PDSCHs to be simultaneously received, pipe line management for NC-JT PDSCH reception is simplified. At this time, in order to ensure the simplification of the implementation complexity of the terminal, for example, “NC-JT capable UE can be allocated with up to 2 (or >2 per the UE capability signaling) PDSCHs on the same OFDM symbol(s), if the k ₀ values of all the PDSCHs are identical. Otherwise, UE may assume that the PDSCH with the minimum k ₀ value is allocated on that OFDM symbol(s) only”. 14 is a diagram illustrating a brief example of this, and is a diagram illustrating a method of monitoring two or more PDSCHs according to an embodiment of the present invention. Referring to FIG. 14, when two different PDSCHs share at least some of the same time and frequency resources, if the k ₀ values of the two PDSCHs are different, the UE regards them as single TRP transmissions (for example, And receive only the highest priority PDSCH) (14-00). On the other hand, when two different PDSCHs allocated by the UE share at least some of the same time and frequency resources, if the k ₀ values of the two PDSCHs are the same, it is regarded as NC-JT transmission and corresponding operation (for example, All PDSCHs are received) (14-05).

for all the PDSCHs are less than given threshold. Otherwise, UE may assume that the PDSCH with the minimum k₀ value is allocated on that OFDM symbol(s) only.”와 같이 약속할 수 있다. 구체적으로 단말은 서로 다른 두 개의 PDSCH가 적어도 일부 같은 시간 및 주파수 자원을 공유하는 경우 만약 이 두 개의 PDSCH의 k₀ 값들의 차이가 상기 제한의 값 보다 크면 single TRP 전송으로 간주하여 이에 해당하는 동작(예를 들면, 가장 높은 우선순위의 PDSCH 하나 만을 수신)을 수행한다. 반면 단말이 할당 받은 서로 다른 두 개의 PDSCH가 적어도 일부 같은 시간 및 주파수 자원을 공유하는 경우 만약 이 두 개의 PDSCH의 k₀ 값들의 차이가 상기 제한의 값 보다 작은 경우 NC-JT 전송으로 간주하여 이에 해당하는 동작(예를 들면, 해당 PDSCH들을 모두 수신)을 수행한다.● Method 5: In this method, when a UE simultaneously receives two or more PDSCHs that share at least some of the time and frequency resources, processing complexity for processing the two or more PDSCHs is reduced, and implementation complexity for PDSCH dropping rules is reduced. In order to do so, it is possible to place a threshold on the difference between k ₀ values for the two or more PDSCHs. The threshold value(s) may be determined in advance, but it may also be known to the terminal through higher layer signaling. That is, when two or more PDSCHs sharing some time and frequency resources are allocated by DCIs transmitted within a given time interval, the UE determines this as NC-JT. At this time, in order to ensure the simplification of the implementation complexity of the terminal, for example, “NC-JT capable UE can be allocated with up to 2 (or >2) PDSCHs on the same OFDM symbol(s), if the value of

for all the PDSCHs are less than given threshold. Otherwise, UE may assume that the PDSCH with the minimum k ₀ value is allocated on that OFDM symbol(s) only. Specifically, when two different PDSCHs share at least some of the same time and frequency resources, if the difference between the k ₀ values of the two PDSCHs is greater than the limit value, the UE regards this as a single TRP transmission ( For example, only one PDSCH of the highest priority is received. On the other hand, when two different PDSCHs allocated by the UE share at least some of the same time and frequency resources, if the difference between the k ₀ values of the two PDSCHs is smaller than the limit value, it is regarded as NC-JT transmission. To perform an operation (for example, receiving all of the corresponding PDSCHs).

● Method 6: In this method, when a UE simultaneously receives two or more PDSCHs that share at least some of the time and frequency resources, processing complexity for the preparation of the two or more PDSCHs is reduced, and implementation complexity for PDSCH dropping rules is reduced. In order to do so, it is possible to determine whether to apply NC-JT based on HARQ process ID values for the two or more PDSCHs. For example, FIG. 15 is a diagram showing another example of a method of monitoring two or more PDSCHs according to an embodiment of the present invention. Referring to FIG. 15, when two or more PDSCHs sharing a part of time and frequency resources are allocated to have different (same) HARQ process IDs, the UE regards them as NC-JT transmissions and operates corresponding thereto (eg For example, all PDSCHs are received. On the other hand, when the two or more PDSCHs are allocated to have the same (different) HARQ process ID, it is determined as a single TRP transmission and performs the corresponding operation (for example, receiving only one PDSCH of the highest priority). .

In this embodiment, the methods 1 to 6 are not mutually exclusive, and it is possible that one or more methods are used in combination depending on conditions. For example, it is possible to apply method 1 to SLIV and PDSCH mapping types and method 4 to k ₀ values. Various other combinations are possible, but not all possibilities are listed in order not to obscure the point of explanation.

<Fourth embodiment: UE capability signaling for NC-JT reception and resource allocation method accordingly>

In this embodiment, a time and frequency domain resource allocation method considering UE capability signaling related to NC-JT of a terminal will be described.

The UE may perform a UE capability report including at least one of the following methods in order to inform the base station whether NC-JT PDSCH can be received.

● Method 1: The UE determines whether it is possible to receive only a single PDSCH associated with one TCI state (or QCL information) or whether simultaneous reception of multiple PDSCHs associated with multiple TCI states (or QCL information) is possible. Can report.

Method 2 (UE capability on NC-JT with overlapped PDSCHs): In the method 1, only the UEs capable of simultaneous reception of multiple PDSCHs associated with multiple TCI states (or QCL information) of each PDSCH that is simultaneously received When the frequency resource indicated by the FD-RA value (or the time resource indicated by the TD-RA value or the DMRS pattern) matches each other, whether the simultaneous reception can be supported may be reported to the base station.

Method 3 (UE capability on NC-JT with non-overlapped PDSCHs): In the method 1, only the terminals capable of simultaneous reception of multiple PDSCHs associated with multiple TCI states (or QCL information) receive each of the simultaneous receptions. When the frequency resource indicated by the FD-RA value of the PDSCH (or the time resource indicated by the TD-RA value or the DMRS pattern) coincides with each other, whether or not the simultaneous reception can be supported may be reported to the base station.

Method 4 (UE capability on NC-JT with partially overlapped PDSCHs): In the method 1, each PDSCH simultaneously receiving the PDSCH only in a terminal capable of simultaneous reception of multiple PDSCHs associated with multiple TCI states (or QCL information) When the frequency resource indicated by the FD-RA value of (or the time resource indicated by the TD-RA value or the DMRS pattern) partially matches, it may report whether the simultaneous reception can be supported to the base station.

If the UE reports to the base station that it supports NC-JT based on the overlapped PDSCH according to the method 2 and the non-overlapped PDSCH or the NC-JT based on the partially overlapped PDSCH according to the method 3 or 4, it reports that the reception is impossible. It is necessary to ensure that FD-RA (or TD-RA) fields in different PDCCH DCIs in which the UE allocates NC-JT PDSCHs have the same value. When the UE is instructed to receive PDSCH allocated by different FD-RA (or TD-RA) fields, the UE does not perform reception of the entire PDSCH or PDSCH having the highest priority among the PDSCHs. Only one can be received.

If the terminal reports to the base station that it supports NC-JT based on the non-overlapped PDSCH according to the method 3 and overlapped PDSCH or partially overlapped PDSCH based NC-JT according to the method 2 or 4, it reports that the reception is impossible It is necessary to ensure that FD-RA (or TD-RA) fields in different PDCCH DCIs in which the UE allocates NC-JT PDSCHs have different values. If the UE is instructed to receive a PDSCH transmitted on a partially overlapping frequency (or time) resource, the UE does not perform reception of the entire PDSCH or only one PDSCH having the highest priority among the PDSCHs. have.

16 is a block diagram showing the structure of a terminal according to an embodiment of the present invention.

Referring to Figure 16, the terminal may be composed of a transmitting and receiving unit (16-00, 16-10), a processing unit (16-05) including a memory and a processor. Depending on the communication method of the above-described terminal, the transceivers 16-00 and 16-10 of the terminal and the processing units 16-05 may operate. However, the components of the terminal are not limited to the above-described examples. For example, the terminal may include more components or fewer components than the aforementioned components. In addition, the transceivers 16-00, 16-10, and the processing units 16-05 may be implemented in the form of one chip.

The transceivers 16-00 and 16-10 may transmit and receive signals to and from the base station. Here, the signal may include control information and data. To this end, the transceivers 16-00, 16-10 may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, an RF receiver for low-noise amplifying the received signal, and down-converting the frequency. have. However, this is only an embodiment of the transceivers 16-00, 16-10, and the components of the transceivers 16-00, 16-10 are not limited to RF transmitters and RF receivers.

Also, the transceivers 16-00 and 16-10 may receive a signal through a wireless channel, output the signal to the processing unit 16-05, and transmit a signal output from the processing unit 16-05 through the wireless channel. .

The processing unit 16-05 may store programs and data necessary for the operation of the terminal. In addition, the processing unit 16-05 may store control information or data included in a signal obtained from the terminal. The processing unit 16-05 may include a memory composed of a storage medium or a combination of storage media such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. Further, the processing unit 16-05 may be electrically connected to the receiving unit 16-00 and the transmitting unit 16-10, and the processing unit 16-05 may include at least one processor.

In addition, the processing unit 16-05 may control a series of processes so that the terminal operates according to the above-described embodiment. According to some embodiments, the processing unit 16-05 may control a component of the terminal to receive a plurality of PDSCHs simultaneously by receiving DCI composed of two layers.

17 is a block diagram showing the structure of a base station according to an embodiment of the present invention.

Referring to FIG. 17, the base station may be composed of a transceiver 17-00, 17-10 and a processing unit 17-05 including a memory and a processor. Depending on the communication method of the base station, the transceivers 17-00 and 17-10 of the base station and the processing unit 17-05 may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or less components than the above-described components. In addition, the transceivers 17-00 and 17-10 and the processing units 17-05 may be implemented in a single chip form.

The transceivers 17-00 and 17-10 may transmit and receive signals to and from the terminal. Here, the signal may include control information and data. To this end, the transceivers 17-00, 17-10 may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. have. However, this is only an embodiment of the transceivers 17-00, 17-10, and the components of the transceivers 17-00, 17-10 are not limited to RF transmitters and RF receivers.

Also, the transceivers 17-00 and 17-10 may receive signals through the wireless channel and output the signals to the processing unit 17-05, and transmit the signals output from the processing units 17-05 through the wireless channel. .

The processing unit 17-05 may store programs and data necessary for the operation of the base station. In addition, the processing unit 17-05 may store control information or data included in a signal obtained from the base station. The processing unit 17-05 may include a memory composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM and a DVD, or a combination of storage media. Further, the processing unit 17-05 may be electrically connected to the receiving unit 17-00 and the transmitting unit 17-10, and the processing unit 17-05 may include at least one processor.

The processor 17-05 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention. According to some embodiments, the processing unit 17-05 may configure two layers of DCIs including allocation information for a plurality of PDSCHs and control each component of the base station to transmit them.

On the other hand, the embodiments of the present invention disclosed in this specification and the drawings are merely to provide a specific example to easily explain the technical content of the present invention and to understand the present invention, and are not intended to limit the scope of the present invention. That is, it is apparent to those having ordinary knowledge in the technical field to which the present invention pertains that other modified examples based on the technical idea of the present invention can be implemented. In addition, each of the above embodiments can be operated in combination with each other as necessary. For example, portions of the first to second embodiments of the present invention may be combined with each other to operate the base station and the terminal.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

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