CN116803164A - Method and apparatus for determining processing time of UE in wireless communication system - Google Patents
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Abstract
The present disclosure relates to fusing a 5G communication system for supporting higher data rates of super 4G systems with IoT technology and may be applied to smart services based on 5G communication technology and IoT-related technology. A method of improving coverage of PDCCH and a method of repeatedly transmitting PDCCH in a wireless communication system is provided. When the PDCCH is repeatedly transmitted, a method for determining a PDSCH processing time and a PUSCH preparation time considered by the UE is provided, and thus, a more efficient communication system can be implemented.
Description
Technical Field
The present disclosure relates generally to operation of a User Equipment (UE) and a Base Station (BS) in a wireless communication system, and more particularly, to a method of determining a processing time in a wireless communication system and an apparatus capable of performing the method.
Background
In order to meet the increasing demand for wireless data traffic since the deployment of fourth generation (4G) communication systems, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. The 5G or pre-5G communication system may also be referred to as a "super 4G network" or a "Long Term Evolution (LTE) after-system.
Consider implementing a 5G communication system in a higher frequency (millimeter (mm) wave) band (e.g., 60 gigahertz (GHz)) band to achieve higher data rates. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna techniques are being discussed in 5G communication systems.
Further, in the 5G communication system, development of system network improvement is being conducted based on advanced small cells, cloud Radio Access Networks (RANs), ultra dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), reception-side interference cancellation, and the like. Hybrid Frequency Shift Keying (FSK) and Quadrature Amplitude Modulation (QAM) (FQAM) and Sliding Window Superposition Coding (SWSC) are being developed for Advanced Code Modulation (ACM), and Filter Bank Multicarrier (FBMC), non-orthogonal multiple access (NOMA) and Sparse Code Multiple Access (SCMA) are also being developed as advanced access technologies.
The internet is evolving to internet of things (IoT) where distributed entities (i.e., things) exchange and process information without human intervention. Internet of everything (IoE) has also emerged as a combination of IoT technology and big data processing technology through connections with cloud servers.
As IoT implementations require technical elements such as "sensing technology," "wired/wireless communication and network infrastructure," "service interface technology," and "security technology," sensor networks, machine-to-machine (M2M) communications, machine-type communications (MTC), etc. have recently been investigated. Such IoT environments may provide intelligent internet technology services by collecting and analyzing data generated between connections. With the convergence and combination between existing Information Technology (IT) and various industrial applications, ioT can be applied in a variety of fields including smart homes, smart buildings, smart cities, smart or networked automobiles, smart grids, healthcare, smart appliances, and advanced medical services.
In keeping with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, techniques such as sensor networks, MTC, and M2M communications may be implemented by beamforming, MIMO, and array antennas. Application of cloud RANs as the big data processing technology described above may also be considered as an example of a fusion between 5G technology and IoT technology.
With the development of the wireless communication system as described above, various services can be provided. Therefore, a scheme for efficiently providing these services is required.
Disclosure of Invention
Technical problem
An aspect of the present disclosure is to provide an apparatus and method capable of efficiently providing a service in a wireless communication system.
Another aspect of the present disclosure is to provide a method of determining a processing time of a UE in consideration of repeated transmission of a downlink control channel, e.g., a Physical Downlink Control Channel (PDCCH).
Solution to the problem
According to an aspect of the present disclosure, there is provided a method performed by a terminal in a communication system. The method comprises the following steps: identifying a first PDCCH and a second PDCCH associated with PDCCH repetition transmissions; identifying a physical downlink scheduled by at least one of the first PDCCH or the second PDCCHShared Channel (PDSCH); identifying a first d associated with a first PDCCH and PDSCH 1,1 Value of second d associated with second PDCCH and PDSCH 1,1 Maximum d in the values 1,1 A value; based on maximum d 1,1 Values to identify PDSCH processing time; and transmitting hybrid automatic repeat request (HARQ) -Acknowledgement (ACK) information of the PDSCH to the base station based on the PDSCH processing time.
According to another aspect of the present disclosure, a method performed by a terminal in a communication system is provided. The method comprises the following steps: identifying a first PDCCH and a second PDCCH associated with PDCCH repeat transmissions, wherein a Physical Uplink Shared Channel (PUSCH) is scheduled by at least one of the first PDCCH or the second PDCCH; identifying a last symbol of a PDCCH ending later in time from among the first PDCCH and the second PDCCH; identifying PUSCH preparation time based on the last symbol; and transmitting the PUSCH to the base station based on the PUSCH preparation time.
According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided. The method comprises the following steps: transmitting a first PDCCH and a second PDCCH associated with PDCCH repeated transmission to a terminal; transmitting a PDSCH scheduled by at least one of the first PDCCH or the second PDCCH to the terminal; and receiving HARQ-ACK information of the PDSCH from the terminal, wherein the HARQ-ACK information is received based on a PDSCH processing time based on a maximum d of the PDSCH processing time 1,1 Value, and maximum d 1,1 The value is from a first d associated with a first PDCCH and PDSCH 1,1 Value, second d associated with second PDCCH and PDSCH 1,1 Values.
According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided. The method comprises the following steps: transmitting a first PDCCH and a second PDCCH associated with PDCCH repeated transmission to a terminal; and receiving a PUSCH scheduled by at least one of the first PDCCH or the second PDCCH from the terminal, wherein the PUSCH is received based on a PUSCH preparation time, and the PUSCH preparation time is based on a last symbol of a PDCCH candidate ending later in time among the first PDCCH and the second PDCCH.
According to another aspect of the present disclosure, there is provided a method in a communication system Terminals for use in the system. The terminal comprises: a transceiver; and a controller configured to identify a first PDCCH and a second PDCCH associated with the PDCCH repetition transmission, identify a PDSCH scheduled by at least one of the first PDCCH or the second PDCCH, and identify a first d associated with the first PDCCH and the PDSCH 1,1 Value of second d associated with second PDCCH and PDSCH 1,1 Maximum d in the values 1,1 Value based on maximum d 1,1 The value identifies a PDSCH processing time, and HARQ-ACK information for the PDSCH is transmitted to the base station based on the PDSCH processing time.
According to another aspect of the present disclosure, a terminal for use in a communication system is provided. The terminal comprises: a transceiver; and a controller configured to identify a first PDCCH and a second PDCCH associated with PDCCH repetition transmission, wherein PUSCH is scheduled by at least one of the first PDCCH or the second PDCCH, identify a last symbol of a PDCCH ending later in time from among the first PDCCH and the second PDCCH, identify a PUSCH preparation time based on the last symbol, and transmit PUSCH to the base station based on the PUSCH preparation time.
According to another aspect of the present disclosure, a base station for use in a communication system is provided. The base station includes: a transceiver; and a controller configured to transmit a first PDCCH and a second PDCCH associated with the PDCCH repeated transmission to the terminal, transmit a PDSCH scheduled by at least one of the first PDCCH or the second PDCCH to the terminal, and receive HARQ-ACK information of the PDSCH from the terminal, wherein the HARQ-ACK information is received based on a PDSCH processing time, the PDSCH processing time being based on a maximum d of the PDSCH processing time 1,1 Value, and maximum d 1,1 The value is from a first d associated with a first PDCCH and PDSCH 1,1 Value, second d associated with second PDCCH and PDSCH 1,1 Values.
According to another aspect of the present disclosure, a base station for use in a communication system is provided. The base station includes: a transceiver; and a controller configured to transmit the first PDCCH and the second PDCCH associated with the PDCCH repetition transmission to the terminal, and to receive a PUSCH scheduled by at least one of the first PDCCH or the second PDCCH from the terminal, wherein the PUSCH is received based on a PUSCH preparation time, and the PUSCH preparation time is based on a last symbol of a PDCCH candidate ending later in time among the first PDCCH and the second PDCCH.
Advantageous effects of the invention
According to various embodiments of the present disclosure, a more efficient communication system may be implemented according to the method of determining a processing time of a UE in consideration of repeated transmission of a downlink control channel provided in a wireless communication system.
Drawings
The foregoing and other objects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 shows a time-frequency domain in a wireless communication system according to an embodiment;
Fig. 2 illustrates a frame, subframe, and slot structure in a wireless communication system according to an embodiment;
fig. 3 illustrates a bandwidth part (BWP) in a wireless communication system according to an embodiment;
fig. 4 illustrates Discontinuous Reception (DRX) operation in a wireless communication system according to an embodiment;
fig. 5 illustrates a control resource set (CORESET) for transmitting a downlink control channel in a wireless communication system according to an embodiment;
fig. 6A illustrates a downlink control channel in a wireless communication system according to an embodiment;
fig. 6B illustrates a UE having a plurality of PDCCH listening positions within a slot by a span (span) in a wireless communication system according to an embodiment;
fig. 7 illustrates BS beam allocation configured according to a Transmission Configuration Indication (TCI) state in a wireless communication system according to an embodiment;
fig. 8 illustrates a method of allocating a TCI state for a PDCCH in a wireless communication system according to an embodiment;
fig. 9 illustrates a TCI indication Medium Access Control (MAC) Control Element (CE) signaling structure of a PDCCH demodulation reference signal (DMRS) in a wireless communication system according to an embodiment of the present disclosure;
fig. 10 illustrates a CORESET and search space beam configuration in a wireless communication system in accordance with an embodiment;
Fig. 11 illustrates a time axis resource allocation of PDSCH in a wireless communication system according to an embodiment;
fig. 12 illustrates allocation of time axis resources of PDSCH in the wireless communication system according to an embodiment;
fig. 13 illustrates allocation of time axis resources according to subcarrier spacing (SCS) of a data channel and a control channel in a wireless communication system according to an embodiment;
fig. 14 illustrates a radio protocol structure of a BS and a UE in a single cell, carrier Aggregation (CA), and Dual Connectivity (DC) in a wireless communication system according to an embodiment;
fig. 15 illustrates antenna ports and resource allocation for cooperative communication in a wireless communication system according to an embodiment;
fig. 16 shows a configuration of Downlink Control Information (DCI) for cooperative communication in a wireless communication system according to an embodiment;
fig. 17 is a flowchart illustrating an operation in which a UE counts the number of PDCCH candidate groups and the number of Control Channel Elements (CCEs) according to a UE capability report in PDCCH repetition transmission and whether BS transmission conditions are satisfied in a wireless communication system according to an embodiment;
fig. 18 is a flowchart showing an operation of PDSCH processing time calculation by a UE according to a UE capability report in PDCCH repetition transmission and whether BS transmission conditions are satisfied in a wireless communication system according to an embodiment;
Fig. 19 illustrates d in PDCCH repetition transmission for expressing Time Division Multiplexing (TDM) in a wireless communication system according to an embodiment 1,1 The time axis positions of PDCCH and PDSCH of various values of (a);
fig. 20 illustrates d in a PDCCH repetition transmission for expressing TDM based on time slot in a wireless communication system according to an embodiment 1,1 The time axis positions of PDCCH and PDSCH of various values of (a);
fig. 21 illustrates d in PDCCH repetition transmission for expressing System Frame Number (SFN) -based transmission in a wireless communication system according to an embodiment 1,1 The time axis positions of PDCCH and PDSCH of various values of (a);
fig. 22 is a flowchart showing an operation in which a UE calculates PUSCH preparation procedure time according to a UE capability report in PDCCH repetition transmission and whether BS transmission conditions are satisfied in a wireless communication system according to an embodiment;
fig. 23 is a flowchart illustrating a PDCCH repetition transmission operation of a BS in a wireless communication system according to an embodiment;
fig. 24 shows a UE according to an embodiment; and is also provided with
Fig. 25 shows a BS according to an embodiment.
Detailed Description
Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
In describing embodiments of the present disclosure, descriptions related to technical contents well known in the art and not directly associated with the present disclosure will be omitted. Unnecessary description is omitted so as to prevent obscuring the main idea of the present disclosure and to more clearly convey the main idea.
For similar reasons, some elements may be exaggerated, omitted, or schematically shown in the drawings. Furthermore, the size of each element does not fully reflect the actual size. In the drawings, identical or corresponding elements are provided with the same reference numerals.
Some of the advantages and features of the present disclosure and ways of accomplishing the same will be apparent by reference to the following detailed embodiments described in connection with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be embodied in various forms. The following examples are provided solely to fully describe and inform those of ordinary skill the scope of the present disclosure and the present disclosure is limited only by the scope of the appended claims.
The terms to be described below are terms defined in consideration of functions in the present disclosure, and may be different according to users, intention of users, or habit. Accordingly, the definition of the terms should be made based on the contents of the entire specification.
In the following description, a BS is an entity that allocates resources to a terminal, and may include at least one of a eNode B, an eNode B, a node B, a radio access unit, a BS controller (BSC), and a node on a network. A terminal may include a UE, a Mobile Station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
In the present disclosure, the downlink refers to a radio link via which a BS transmits signals to a terminal, and the uplink refers to a radio link via which a terminal transmits signals to a BS. Furthermore, although the following description may be directed to an LTE or LTE-advanced (LTE-a) system by way of example, embodiments of the present disclosure may also be applied to other communication systems having similar technical contexts or channel types. Examples of other communication systems may include 5G mobile communication technology developed by LTE-a (e.g., new Radio (NR)), and in the following description, "5G" may be a concept covering existing LTE, LTE-a, and other similar services. Further, based on the determination by those skilled in the art, the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.
Herein, each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer-usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
Furthermore, each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
As used herein, the term "unit" may refer to a software element or a hardware element, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), that performs a predetermined function. However, the "unit" does not always have a meaning limited to software or hardware. The "unit" may be structured to be stored in an addressable storage medium or to execute one or more processors. Thus, the term "unit" may include software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" may be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units". Furthermore, the elements and "units" may be implemented to render one or more Central Processing Units (CPUs) within a device or secure multimedia card. Further, a "unit" may include one or more processors.
Wireless communication systems have been developed as broadband wireless communication systems that provide high-speed and high-quality packet data services according to communication standards such as high-speed packet access (HSPA) of the third generation partnership project (3 GPP), LTE or evolved universal terrestrial radio access (E-UTRA), LTE-A, LTE-Pro, high-speed packet data (HRPD) of 3GPP2, ultra Mobile Broadband (UMB), and 802.16E of the Institute of Electrical and Electronics Engineers (IEEE), in addition to the initially provided voice-based services.
An LTE system, which is a representative example of a broadband wireless communication system, employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme for a downlink and a single carrier frequency division multiple access (SC-FDMA) scheme for an uplink. The uplink is a radio link through which the UE (or MS) transmits data or control signals to the BS (or eNode B), and the downlink is a radio link through which the BS transmits data or control signals to the UE. In the multiple access scheme as described above, in order to identify data or control information of each user, time-frequency resources for carrying the data or control information are allocated and operated in such a manner that resource overlap (i.e., orthogonality is established) between users is prevented.
The post LTE communication system (e.g., 5G communication system) should be able to freely reflect various demands of users and service providers, and thus should support services satisfying the various demands. Services considered for 5G communication systems include enhanced mobile broadband (emmbb), large-scale MTC (emtc), and Ultra Reliable Low Latency Communication (URLLC).
The emmbb is intended to provide an improved data transmission rate over the data transmission rate supported by legacy LTE, LTE-a or LTE-Pro. For example, in a 5G communication system, from the perspective of one BS, an eMBB should provide a peak downlink data rate of 20Gbps and a peak uplink data rate of 10 Gbps. In addition, 5G communication systems should provide peak data rates as well as improved user perceived data rates.
To meet such demands, various transmission/reception techniques, including further improved MIMO transmission techniques, are required to be improved. Further, although the current LTE system transmits signals using a transmission bandwidth from a bandwidth of 2GHz to a maximum bandwidth of 20MHz, the 5G communication system uses a frequency bandwidth wider than 20MHz in a frequency band of 3GHz to 6GHz or higher than or equal to 6GHz, whereby a data transmission rate required for the 5G communication system can be satisfied.
In order to support application services such as IoT, mctc is considered in 5G communication systems. mctc should support access for many UEs within a cell, improve UE coverage, increase battery life, and reduce UE cost for efficientIoT is provided. IoT attaches to various sensors and devices to provide communications, and thus should support a large number of UEs within a cell (e.g., 1,000,000 UEs/km 2 ). Since a UE supporting mctc is likely to be located in a shadow area where a cell cannot cover due to service characteristics, such as a basement of a building, mctc may require wider coverage than other services provided by a 5G communication system.
UEs supporting mctc should also be produced at low cost. Furthermore, since frequent battery replacement of a UE supporting mctc is often difficult, very long battery life, e.g., 10 to 15 years, may also be required.
URLLC is a cellular-based wireless communication service that is used for specific (mission critical) purposes. For example, services for remote control of robots or machines, industrial automation, unmanned aerial vehicles, remote healthcare and emergency alerts may be considered. Thus, the communication provided by URLLC should provide very low latency and very high reliability. Services supporting URLLC should meet radio access delay times (e.g., air interface delays) of less than 0.5 ms and also require less than or equal to 10 -5 Is used for the packet error rate of (a). Thus, for services supporting URLLC, a 5G system should provide a smaller Transmission Time Interval (TTI) than other systems, and also have design requirements to allocate a large amount of resources in the frequency band in order to guarantee the reliability of the communication link.
The emmbb, URLLC, and mctc may also be multiplexed and transmitted in one system. However, in order to meet different requirements of the respective services, different transmission/reception schemes and transmission/reception parameters may be used for the services. Of course, 5G is not limited to the above three services.
NR time-frequency resource
Fig. 1 illustrates a time-frequency domain in a wireless communication system according to an embodiment.
Referring to fig. 1, the horizontal axis indicates a time domain and the vertical axis indicates a frequency domain. The basic unit of resources in the time and frequency domains is a Resource Element (RE) 101, and may be defined as 1 OFDM symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. In the frequency domain of the power supply,(e.g., 12) consecutive REs may correspond to one Resource Block (RB) 104.
Fig. 2 illustrates a frame, subframe, and slot structure in a wireless communication system according to an embodiment.
Referring to fig. 2, a frame 200 may be defined as 10ms, and a subframe 201 may be defined as 1ms, and thus one frame 200 may include a total of 10 subframes 201. Slots 202 or 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per slot ). The subframe 201 may include one slot 202 or a plurality of slots 203, and the number of slots 202 or 203 per subframe 201 may vary according to the configuration value μ 204 or 205 of the SCS. Fig. 2 shows an example of SCS configuration values μ=0 204 and SCS configuration values μ=1 205. In the case of μ=0 204, the subframe 201 may include one slot 202, and in the case of μ=1 205, 1 subframe 201 may include 2 slots 203. That is, the number of slots per subframeCan be varied according to the configuration value (mu) of SCS, so the number of time slots per frame +.>May vary. According to the number of SCS configuration values (mu)>And quantity->Can be defined as shown in table 1 below.
TABLE 1
BWP
Fig. 3 illustrates BWP in a wireless communication system according to an embodiment.
Referring to fig. 3, the ue bandwidth 300 is configured as two BWP, i.e., bwp#1 31 and bwp#2302. The BS may configure one or more BWP in the UE, and information as shown in table 2 may be configured to each BWP.
TABLE 2
Of course, the present disclosure is not limited to the examples of table 2 and fig. 3, and various parameters related to BWP and configuration information may be configured in the UE. The information may be transmitted by the BS to the UE through higher layer signaling (e.g., radio Resource Control (RRC) signaling). Among the one or more configured BWP, at least one BWP may be activated. The information indicating whether to activate the configured BWP may be semi-statically transferred from the BS to the UE through RRC signaling or may be dynamically transferred through DCI.
Prior to RRC connection, the UE may receive a configuration of an initial BWP for initial access from the BS through a Master Information Block (MIB). More specifically, the UE may receive configuration information of CORESET and search space, wherein a PDCCH for receiving system information (e.g., remaining system information (RMSI) or system information block 1 (SIB 1)) for initial access through the MIB may be transmitted in an initial access step. CORESET and search space configured as MIB may be considered Identity (ID) 0. The BS may notify the UE of configuration information such as frequency allocation information, time allocation information, parameter set (numerology), etc. of CORESET #0 through the MIB. In addition, the BS may inform the UE of configuration information of the listening period and occasion of CORESET #0, i.e., configuration information of search space #0, through the MIB. The UE may consider the frequency region configured as CORESET #0 acquired from the MIB as an initial BWP for initial access. At this time, the ID of the initial BWP may be regarded as 0.
The configuration of BWP supported by a wireless communication system (e.g., a 5G system or an NR system) according to an embodiment of the present disclosure may be used for various purposes.
When the UE supports a narrower bandwidth than the system bandwidth, it may be supported by a BWP configuration. For example, the BS may configure a frequency location of BWP (i.e., configuration information 2) in the UE, and thus the UE may transmit and receive data at a specific frequency location within the system bandwidth.
Further, in order to support different parameter sets, the BS may configure a plurality of BWP in the UE. For example, in order to support the UE to perform data transmission and reception using SCS of 15kHz and SCS of 30kHz, two BWPs may be configured as SCS of 15kHz and 30kHz, respectively. The different BWP may be frequency division multiplexed, and when data is to be transmitted and received at a specific SCS, BWP configured at the corresponding SCS may be activated.
In order to reduce power consumption of the UE, the BS may configure BWP having different bandwidth sizes in the UE. For example, when a UE supports a very large bandwidth, e.g., 100MHz, but always transmits and receives data through the bandwidth, very high power consumption may occur. In particular, from a power consumption point of view, it is very inefficient to listen to unnecessary downlink control channels over a large bandwidth of 100MHz when there is no traffic. In order to reduce power consumption of the UE, the BS may configure BWP having a relatively narrow bandwidth (e.g., a bandwidth of 200 MHz). When there is no traffic, the UE may perform a listening operation in the BWP of 200MHz and, if data is generated, may transmit and receive data through the BWP of 100MHz according to an instruction from the BS.
In the method of configuring BWP, the UE may receive configuration information of the initial BWP through the MIB in an initial access step before RRC connection. More specifically, the UE may receive a configuration of CORESET of a downlink control channel in which DCI for scheduling SIBs may be transmitted from MIB of a Physical Broadcast Channel (PBCH). The bandwidth of CORESET configured as MIB may be regarded as initial BWP, and UE may receive PDSCH transmitting SIB through the configured initial BWP. The initial BWP may be used to receive SIBs and Other System Information (OSI), paging, or random access.
BWP change
When one or more BWP is configured in the UE, the BS may indicate a change (e.g., handover or transition) of BWP to the UE through a BWP indicator field within the DCI. For example, referring again to fig. 3, when the currently activated BWP of the UE is bwp#1 301, the BS may indicate bwp#2 302 to the UE through the BWP indicator within the DCI, and the UE may change to bwp#2 302 as indicated by the received BWP indicator within the DCI.
Since the DCI-based BWP change may be indicated by DCI for scheduling PDSCH or PUSCH, if the UE receives the BWP change request, the UE should be able to receive or transmit PDSCH or PUSCH scheduled by the corresponding DCI in the changed BWP without any difficulty. For this purpose, the standard has defined the delay time (T BWP ) For example, as shown in table 3.
TABLE 3
The requirement for BWP change delay time may support either type 1 or type 2 depending on UE capabilities. The UE may report supportable BWP delay time types to the BS.
When the UE receives DCI including a BWP change indicator in slot n according to a requirement for a BWP change delay time, the UE may be no later than slot n+t BWP To the change of the new BWP indicated by the BWP change indicator, and then transmits and/or receives the data channel scheduled by the corresponding DCI in the changed new BWP.
When the BS desires to schedule the data channel in the new BWP, the BS may consider the BWP change delay time (T BWP ) While determining the time domain resource allocation of the data channel. That is, when scheduling a data channel in a new BWP, the BS may schedule a corresponding data channel after a BWP change delay time when determining a time domain resource allocation of the data channel. Therefore, the UE may not expect DCI indicating a BWP change to indicate that the BWP change is less than the BWP change delay time (T BWP ) Time slot offset (K) 0 Or K 2 )。
If the UE receives DCI (e.g., DCI format 1_1 or 0_1) indicating a BWP change, the UE may be receiving a packet from a slave deviceThird symbol including slot of PDCCH of corresponding DCI to slot offset (K) indicated by time domain resource allocation field in corresponding DCI 0 Or K 2 ) No transmission or reception is performed during the time interval of the start point of the indicated slot. When the UE receives DCI indicating a BWP change in the slot n and the slot offset value indicated by the corresponding DCI is K, the UE may not perform transmission or reception from the third symbol of the slot n to the symbol before the slot n+k (i.e., the last symbol of the slot n+k-1).
Synchronization Signal (SS)/PBCH block
The SS/PBCH block may be a physical layer channel block including a primary SS (PSS), a Secondary SS (SSs), and a PBCH. A more detailed description thereof is provided below.
-PSS: is a reference for downlink time/frequency synchronization and provides some information of the cell ID.
SSS: is a reference for downlink time/frequency synchronization and provides the remaining cell ID information not provided by the PSS. In addition, SSS is used as a reference signal for demodulation of PBCH.
-PBCH: system information required for transmitting and receiving a data channel and a control channel by a UE is provided. The system information may include search space related control information indicating radio resource mapping information of the control channel and scheduling control information of a separate data channel for transmitting the system information.
-SS/PBCH block: including combinations of PSS, SSS and PBCH. One or more SS/PBCH blocks may be transmitted in 5ms time, and each of the transmitted SS/PBCH blocks may be separated by an index.
The UE may detect PSS and SSS in the initial access phase and decode the PBCH. The UE may obtain MIB from the PBCH and receive therefrom a configuration of CORESET #0 (corresponding to CORESET with CORESET index 0). The UE may listen to CORESET #0 based on the selected SS/PBCH block and the assumption that the DMRS transmitted in CORESET #0 is quasi co-located (QCLed). The UE may receive SI through DCI transmitted in CORESET #0. The UE may acquire configuration information related to a Random Access Channel (RACH) for initial access from the received system information. The UE may transmit a Physical RACH (PRACH) to the BS in consideration of the selected SS/PBCH block index, and the BS receiving the PRACH may acquire the SS/PBCH block index selected by the UE. The BS can know which block the UE has selected from among SS/PBCH blocks and the CORESET #0 associated therewith is listened to.
DRX
Fig. 4 illustrates a DRX operation in a wireless communication system according to an embodiment.
DRX is an operation in which a UE using a service discontinuously receives data in an RRC connected state in which a radio link is established between the BS and the UE. The UE may turn on the receiver at a specific point of time and listen to the control channel when DRX is applied, and turn off the receiver to reduce power consumption of the UE when data is not received for a predetermined period of time. DRX operation may be controlled by the MAC layer device based on various parameters and timers.
Referring to fig. 4, the active time 405 is a time when the UE wakes up and listens to the PDCCH every DRX cycle. The activity time 405 may be defined as follows:
-drx-ondurationTimer or drx-InactivityTimer or drx-retransmission Timer DL or drx-retransmission Timer UL or ra-Contention Resolution Timer is running; or alternatively
-the scheduling request is transmitted on a Physical Uplink Control Channel (PUCCH) and is pending; or alternatively
-not receiving a PDCCH indicating a new transmission of a cell radio network temporary identifier (C-RNTI) addressed to the MAC entity after successful reception of a Random Access Response (RAR) for a random access preamble not selected by the MAC entity among contention based random access preambles;
The drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-contentioresolute and the like are timers whose values are configured by the BS, and have a function of being configured to listen to the PDCCH by the UE in a state where a predetermined condition is satisfied.
The DRX-onduration timer 415 is a parameter for configuring the minimum time in which the UE wakes up in the DRX cycle. The drx-incavitytimer 420 is a parameter for configuring a time in which the UE additionally wakes up when receiving a PDCCH indicating a new uplink transmission or downlink transmission as indicated by reference numeral 430. drx-retransmission timerdl is a parameter for configuring the maximum time in which the UE wakes up to receive downlink retransmissions in the downlink HARQ process. The drx-retransmission timer ul is a parameter for configuring the maximum time in which the UE wakes up to receive an grant of uplink retransmission in the uplink HARQ process. The drx-onDurationTimer, drx-InactivityTimer, drx-retransmission timerdl and drx-retransmission timersl may be configured as, for example, time, number of subframes, number of slots, and the like. ra-contentioresolute is a parameter for listening to PDCCH during random access.
The inactive time 410 is a time when PDCCH listening is not performed or a time when PDCCH reception is not performed during the DRX operation, and a remaining time except for the active time 405 among the entire time when the DRX operation is performed. When the PDCCH is not monitored during the active time 405, the UE may enter a sleep or inactive state, thereby reducing power consumption.
The DRX cycle refers to a period in which the UE wakes up and listens to the PDCCH. That is, the DRX cycle is a period of time interval or on duration from when the UE listens to the PDCCH to when it listens to the next PDCCH. The DRX cycle may be a short DRX cycle or a long DRX cycle. A short DRX cycle may optionally be applied.
The long DRX cycle 425 is a longer cycle among two DRX cycles configured in the UE. When operating with a long DRX cycle, the UE starts the DRX-onduration timer 415 at a point in time after the start point (e.g., start symbol) of the DRX-onduration timer 415 by the long DRX cycle 425. In operation of the long DRX cycle 425, the UE may start the DRX-onduration timer 415 in a slot after DRX-SlotOffset in a subframe satisfying the following equation (1). Here, drx-SlotOffset is the delay before drx-onduration timer 415 starts. The drx-SlotOffset may be configured as time, number of slots, etc.
[ (SFN X10) +subframe number ] module (drx-LognCycle) =drx-StartOfsset
...(1)
The DRX-longcyclestatoffset and DRX-StartOffset may be used to define subframes for starting the long DRX cycle 425. The drx-longcycletartoffset may be configured as time, number of subframes, number of slots, etc.
PDCCH: DCI correlation
In a 5G or NR wireless communication system, scheduling information of UL data (or a physical uplink data channel (e.g., PUSCH)) or downlink data (or a physical downlink data channel (e.g., PDSCH)) is transmitted from a BS to a UE through DCI. The UE may listen to the fallback DCI format and the non-fallback DCI format of the PUSCH or PDSCH. The fallback DCI format may include a fixed field predefined between the BS and the UE, and the non-fallback DCI format may include a configurable field.
The DCI may be transmitted through the PDCCH via a channel coding and modulation procedure. A Cyclic Redundancy Check (CRC) may be added to the DCI message payload and may be scrambled by an RNTI corresponding to the ID of the UE. Different RNTIs may be used depending on the purpose of the DCI message, e.g., UE-specific data transmission, power control commands, random access response, etc. That is, the RNTI may not be explicitly transmitted but be included in the CRC calculation process to be transmitted. If a DCI message transmitted through a PDCCH is received, the UE may recognize the CRC through the allocated RNTI, and when the CRC is determined to be correct based on the CRC recognition result, it may recognize that the corresponding message is transmitted to the UE.
For example, DCI for scheduling PDSCH for SI may be scrambled by SI-RNTI. The DCI for scheduling PDSCH for the RAR message may be scrambled by a Random Access (RA) -RNTI. The DCI for scheduling PDSCH for paging messages may be scrambled by a paging (P) -RNTI. The DCI for informing the Slot Format Indicator (SFI) may be scrambled by the SFI-RNTI. The DCI for informing the Transmit Power Control (TPC) may be scrambled with a TPC-RNTI. The DCI for scheduling the UE-specific PDSCH or PUSCH may be scrambled by the C-RNTI.
DCI format 0_0 may be used to schedule a fallback DCI for PUSCH, where the CRC may be scrambled by the C-RNTI. The DCI format 0_0 with CRC scrambled by the C-RNTI may include the following as shown in table 4.
TABLE 4
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DCI format 0_1 may be used for non-fallback DCI to schedule PUSCH, where the CRC may be scrambled by the C-RNTI. The DCI format 0_1 with CRC scrambled by the C-RNTI may include information shown in table 5.
TABLE 5
DCI format 1_0 may be used for a fallback DCI for scheduling PDSCH, where the CRC may be scrambled by the C-RNTI. The DCI format 1_0 with CRC scrambled by the C-RNTI may include the information in table 6.
TABLE 6
DCI format 1_1 may be used for non-fallback DCI for scheduling PDSCH, where the CRC may be scrambled by the C-RNTI. The DCI format 1_1 with CRC scrambled by the C-RNTI may include the information in Table 7.
TABLE 7
PDCCH: CORESET, REG, CCE search space
Fig. 5 illustrates CORESET transmitting a downlink control channel in a wireless communication system according to an embodiment.
Referring to fig. 5, a UE BWP 510 is configured on a frequency axis, and two CORESETs (CORESET #1 501 and CORESET #2 502) are configured within 1 slot 520 on a time axis. CORESETs 501 and 502 may be configured in a specific frequency resource 503 within the total UE BWP 510 on the frequency axis. CORESET may be configured as one or more OFDM symbols on a time axis, which may be defined as CORESET duration 504. Referring to the example shown in fig. 5, CORESET #1 501 may be configured as a CORESET duration of 2 symbols, and CORESET #2 502 may be configured as a CORESET duration of 1 symbol.
CORESET in wireless communication may be configured in the UE by the BS through higher layer signaling (e.g., system information, MIB, or RRC signaling). Configuring CORESET in the UE may include providing information such as CORESET ID, CORESET frequency location, and CORESET symbol length. For example, the information in table 8 may be provided.
TABLE 8
In table 8, TCI-statepdcch (referred to as TCI state) configuration information may include information about one or more SS/PBCH block indexes or CSI-RS indexes having a QCL relationship with DMRS transmitted in a corresponding CORESET.
Fig. 6A illustrates a downlink control channel in a wireless communication system according to an embodiment. More specifically, fig. 6A illustrates an example of a basic unit of time and frequency resources included in a downlink control channel that may be used in a wireless communication system (e.g., a 5G or NR system) according to an embodiment.
Referring to fig. 6A, a basic unit of time and frequency resources included in the control channel may be a RE group (REG) 603, which may be defined as 1 OFDM symbol 601 on a time axis and 1 PRB 602 on a frequency axis, i.e., as 12 subcarriers. The BS may configure the downlink control channel allocation unit through the concatenated REGs 603.
When the basic unit for allocation of a downlink control channel in a wireless communication system is CCE 604, 1 CCE 604 may include a plurality of REGs 603. The REGs 603 may include 12 REs, and when 1 CCE 604 includes 6 REGs 603, 1 CCE 604 may include 72 REs. When configuring a downlink core, the corresponding region may include a plurality of CCEs 604, and a particular downlink control channel may be mapped to one or more CCEs 604 according to an Aggregation Level (AL) within the core and then transmitted. CCEs 604 within CORESET may be distinguished by numbers, and the numbers of CCEs 604 may be allocated according to a logical mapping scheme.
The REG 603 may include all REs to which DCI is mapped and regions to which DMRS 605, which is a reference signal for decoding REs, is mapped. As shown in fig. 6A, 3 DMRS 605 may be transmitted in 1 REG 603. Depending on AL, the number of CCEs required to transmit PDCCH may be 1, 2, 4, 8 or 16, and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, if al=1, one downlink control channel may be transmitted through L CCEs. The UE should detect a signal in a state that the UE does not know information about a downlink control channel, and a search space indicating a CCE set is defined to perform blind decoding in the wireless communication system. The search space is a set of downlink control channel candidates including CCEs that the UE should attempt to decode at a given AL, and there are several ALs at which one set of CCEs is configured by 1, 2, 4, 8, and 16 CCEs so that the UE can have multiple search spaces. The set of search spaces may be defined as the set of search spaces at all configured ALs.
The search space may be classified into a Common Search Space (CSS) and a UE-specific search space. The UEs or all UEs in the predetermined group may search for the CSS of the PDCCH in order to receive cell common control information, such as dynamic scheduling of system information or paging messages. For example, PDSCH scheduling allocation information for transmission of SIBs including information about a service provider of a cell may be received through CSS of a search (or listening) PDCCH. In case of CSS, UEs or all UEs in a predetermined group should receive PDCCH so that a common search space can be defined as a set of pre-arranged CCEs. The scheduling allocation information of the UE-specific PDSCH or PUSCH may be received by searching a UE-specific search space of the PDCCH. The UE-specific search space may be defined UE-specific as a function of the UE ID and various system parameters.
Parameters of a search space of a PDCCH in a wireless communication system may be configured in a UE by a BS through higher layer signaling (e.g., SIB, MIB, or RRC signaling). For example, the BS may configure the number of PDCCH candidates at each AL L, the listening period of the search space, the listening occasion in symbols within a slot for the search space, the search space type (i.e., CSS or UE-specific search space), the combination of DCI format and RNTI to be listened to in the corresponding search space, and the CORESET index for listening to the search space in the UE. For example, the information in table 9 may be configured.
TABLE 9
The BS may configure one or more search space sets in the UE according to the configuration information. The BS may configure search space set 1 and search space 2 in the UE, and the configuration may be performed such that DCI format a scrambled by X-RNTI in search space set 1 is listened to in the CSS, and DCI format B scrambled by Y-RNTI in search space set 2 is listened to in the UE-specific search space.
There may be one or more search space sets in the CSS or UE-specific search space. For example, search space set #1 and search space set #2 may be configured as CSS, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.
In CSS, the following combination of DCI format and RNTI may be listened to. Of course, the present disclosure is not limited to the following examples.
-DCI format 0_0/1_0, wherein the CRC is scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI
DCI format 2_0, where the CRC is scrambled by SFI-RNTI
DCI format 2_1, where the CRC is scrambled by the INT-RNTI
-DCI format 2_2, wherein the CRC is scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI
DCI format 2_3, where the CRC is scrambled by TPC-SRS-RNTI
In the UE-specific search space, the following combination of DCI format and RNTI may be monitored. Of course, the present disclosure is not limited to the following examples.
-DCI format 0_0/1_0, wherein the CRC is scrambled by C-RNTI, CS-RNTI, TC-RNTI
DCI format 1_0/1_1, where the RNTI described by C-RNTI, CS-RNTI, TC-RNTI scrambling may follow the following definition and use.
-C-RNTI: scheduling UE-specific PDSCH
Temporary C-RNTI (TC-RNTI): PDSCH scheduling for UE-specific
-Configured Scheduling (CS) -RNTI: UE-specific PDSCH scheduling RA-RNTI for semi-static configuration: PDSCH scheduling for random access phase
-P-RNTI: PDSCH scheduling for transmitting paging therethrough
-SI-RNTI: PDSCH scheduling for transmitting system information therethrough
Interrupt RNTI (INT-RNTI): for indicating whether to puncture the PDSCH (puncturing)
TPC for PUSCH RNTI (TPC-PUSCH-RNTI): for indicating PUSCH power control commands
TPC for PUCCH RNTI (TPC-PUCCH-RNTI): for indicating PUCCH power control commands
TPC (TPC-SRS-RNTI) for SRS RNTI: for indicating SRS power control commands
The DCI format may follow the definition in table 10.
TABLE 10
The search space of CORESET p and AL L in the set of search spaces s in the wireless communication system may be expressed as shown in equation (2) below.
In equation (2):
-L: aggregation level
-n CI : carrier index
-N CCE , p : total number of CCEs present in CORESET p
-n μ s,f : time slot index
-M (L) p,s,max : number of PDCCH candidates at aggregation level L
-m snCI ＝0,...,M (L) p,s,max -1: PDCCH candidate index at aggregation level L
-i＝0,...,L-1
-Y p，-1 ＝n RNTI ≠0，A 0 ＝39827，A 1 ＝39829A 2 ＝39839,D＝65537
-n RNTI : UE identifier
In the case of CSS may correspond to 0.
In the case of a UE-specific search space, it may correspond to a value that varies according to a UE ID (e.g., C-RNTI or an ID configured by the BS in the UE) and a time index.
In a wireless communication system, the set of search space sets that are monitored by a UE at each point in time may vary, as multiple sets of search spaces may be configured to different parameters (e.g., the parameters shown in table 9 above). For example, when the search space set #1 is configured on the X-slot period, the search space set #2 is configured on the Y-slot period, and X and Y are different from each other, the UE may listen to all of the search space set #1 and the search space set #2 in a specific slot, and to one of the search space set #1 and the search space set #2 in another specific slot.
PDCCH: span (span)
When there are multiple PDCCH listening locations within a slot, the UE may report UE capabilities, at which point the concept "span" may be used. The span includes consecutive symbols within the slot in which the UE may listen to the PDCCH, and each PDCCH listening position may be within 1 span. The span may be expressed by (X, Y), where X refers to the minimum number of symbols that should be spaced between the first symbol of two consecutive spans, and Y refers to the number of consecutive symbols within one span for listening to the PDCCH. The UE may listen for the PDCCH in a zone within Y symbols starting from the first symbol of the span within the span.
Fig. 6B illustrates a UE having a plurality of PDCCH listening positions within a slot by span in a wireless communication system according to an embodiment.
Referring to fig. 6B, spans can be expressed by (X, Y) = (7, 4), (4, 3), and (2, 2), and three cases are expressed as (6B-00), (6B-05), and (6B-10). For example, (6 b-00) indicates the case where the number of spans that can be expressed by (7, 4) in a slot is 2. The interval between the first symbols of 2 spans is expressed as x=7, the pdcch listening position may exist within a total of y=3 symbols from the first symbol of each span, and search spaces 1 and 2 exist within y=3 symbols. (6 b-05) indicates a case where the total number of spans that can be expressed by (4, 3) in the slot is 3, and the interval between the second span and the third span is X' =5 symbols larger than x=4.
PDCCH: UE capability reporting
As shown in table 11, the slot positions of the CSS and UE-specific search spaces are indicated by monitoringsymbols witnesslot parameters, and as shown in table 9, the symbol positions within the slots are indicated by bitmaps by monitoringsymbols witnesslot parameters. Symbol positions within a slot in which a UE may perform search space listening may be reported to a BS by the following UE capabilities.
UE capability 1 (hereinafter FG 3-1). When the number of listening occasions for type 1 and type 3 search spaces or UE-specific search spaces within a slot is 1, the UE capability is to listen to the corresponding MO if it is within the first 3 symbols in the slot. UE capability is a mandatory capability that all UEs supporting NR should support and whether the capability is supported is not explicitly reported to the BS.
TABLE 11
UE capability 2 (hereinafter FG 3-2). As shown in table 12 below, when the number of listening occasions for a CSS or UE-specific search space within a slot is one, the UE capability is to perform listening regardless of the starting symbol position of the corresponding MO. UE capabilities may optionally be supported by the UE and whether the capabilities are supported is explicitly reported to the BS.
TABLE 12
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UE capability 3 (hereinafter FG 3-5, 3-5a or 3-5 b). As shown in table 13 below, the UE capability indicates the mode of the MO that the UE can listen to when the number of listening occasions for CSS or UE-specific search space is multiple within a slot. The pattern includes an interval X between start symbols of different MOs and a maximum symbol length Y of one MO. The combination of (X, Y) supported by the UE may be one or more of { (2, 2), (4, 3), (7, 3) }. UE capabilities may optionally be supported by the UE and whether the capabilities and combinations (X, Y) are supported are explicitly reported to the BS.
TABLE 13
The UE may report to the BS whether UE capability 2 and/or UE capability 3 and related parameters are supported. The BS may allocate timeline resources for the CSS and UE-specific search space based on the UE capabilities. In the resource allocation, the BS may not place the MO in a position where the UE cannot perform listening.
PDCCH: BD/CCE restriction
If multiple search space sets are configured in the UE, the method of determining the search space set that the UE should listen to may consider the following condition.
If the UE receives a configuration of the value of monitoringcapability config-r16, which is higher layer signaling that is r15monitoringcapability, the UE defines the maximum of the number of PDCCH candidates that can be listened to and the number of CCEs included in the entire search space (indicating the set of the entire CCE set corresponding to the joint region of the multiple search space sets).
When the UE receives a configuration of a value of monitoringcapability config-r16 as r16monitoringcapability, the UE may define a maximum of the number of PDCCH candidates that can be listened to and the number of CCEs included in the entire search space (indicating the entire CCE set corresponding to the joint region of the multiple search space sets) for each span.
Condition 1: restriction on maximum number of PDCCH candidates
When being configured to 15+/-2 based on SCS μ Defining a maximum number M of PDCCH candidates that a UE can listen to according to a configuration value of higher layer signaling as described above for a slot in a cell of kHz μ When maximum number M μ Following table 14 below, and when the maximum number M of PDCCH candidates is defined based on span μ When maximum number M μ Table 15 below is followed.
TABLE 14
TABLE 15
Condition 2: restriction on maximum number of CCEs
When being configured to 15+/-2 based on SCS μ Time slots in cells of kHz define a maximum number C of CCEs included in all search spaces (indicating a set of entire CCE sets corresponding to a joint region of multiple search space sets) according to configuration values of higher layer signaling μ Maximum number C μ Following table 16 below, and when the maximum number C of CCEs is defined based on span μ Maximum number C μ Table 17 below is followed.
TABLE 16
TABLE 17
For convenience of description, a case where the conditions 1 and 2 are satisfied at a specific point in time is defined as "condition a". Thus, an unsatisfied condition a may indicate that at least one of conditions 1 and 2 is not satisfied.
PDCCH: oversubscription (oversubscription)
Depending on the configuration of the search space set of BSs, condition a may not be satisfied at a specific point in time. If the condition a is not satisfied at a specific point of time, the UE may select and listen to only some of the search space sets configured to satisfy the condition a at the corresponding point of time, and the BS may transmit the PDCCH through the selected search space set.
The following method may be applied as a method of selecting some of the set of search spaces of all configurations.
-if condition a of the PDCCH is not satisfied at a specific point of time (e.g., a slot), the UE (or BS) may select a search space set whose search space type is configured as a common search space among search space sets existing at the corresponding point of time in preference to a search space set whose search space type is configured as a UE-specific search space.
If the set of search spaces configured as common search spaces are all selected (i.e., if condition a is satisfied even after all search spaces configured as common search spaces are selected), the UE (or BS) may select the set of search spaces configured as UE-specific search spaces. If the number of search space sets configured as UE-specific search spaces is multiple, the search space set with the lower search space set index may have a higher priority. The UE-specific set of search spaces may be selected within the range that satisfies condition a in consideration of priority.
QCL, TCI state
In a wireless communication system, one or more different antenna ports (channels, signals, or a combination thereof) may be associated by QCL configurations shown in table 18 below. The TCI state informs the QCL relationship between the PDCCH (or PDCCH DMRS) and another RS or channel and the reference antenna port a (reference rs#a) and another destination antenna port B (target rs#b) of the QCL indicates that the UE is allowed to apply some or all of the large-scale channel parameters estimated in antenna port a to the channel measurements from antenna port B. QCL is used to correlate different parameters according to conditions such as: 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by doppler shift and doppler spread, 3) Radio Resource Management (RRM) affected by average gain, and 4) Beam Management (BM) affected by spatial parameters. Thus, NR supports four types of QCL relationships, as shown in Table 18 below.
TABLE 18
The spatial RX parameters may refer to some or all of various parameters such as angle of arrival (AoA), power Angle Spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit/receive channel correlation, transmit/receive beamforming, and spatial channel correlation.
The QCL relationship may be configured in the UE through RRC parameters TCI-state and QCL-Info as shown in table 19 below. Referring to table 19, the bs may configure one or more TCI states in the UE and inform the UE of the maximum value of two QCL relationships (QCL-Type 1 and QCL-Type 2) of RSs (i.e., target RSs) referencing IDs of the TCI states. Each piece of QCL information (QCL-Info) included in the TCI state includes a serving cell index and a BWP index of the reference RS indicated by the corresponding QCL information, a type and ID of the reference RS, and a QCL type, as shown in table 14 above.
TABLE 19
Fig. 7 illustrates BS beam allocation configured according to TCI status in a wireless communication system according to an embodiment.
Referring to fig. 7, the bs may transmit information about N different beams to the UE through N different TCI states. For example, when n=3 as shown in fig. 7, the BS may inform QCL-Type 2 parameters included in the three TCI states 700, 705 and 710 to be associated with CSI-RS or SS blocks (SSBs) corresponding to different beams to be configured as QCL Type D, and antenna ports referring to the different TCI states 700, 705 and 710 to be associated with different spatial Rx parameters (i.e., different beams).
Tables 20 to 24 below show the effective TCI state configuration according to the target antenna port type.
Specifically, table 20 shows the effective TCI state configuration when the target antenna port is a CSI-RS for tracking (e.g., tracking RS (TRS)). The TRS is a non-ZP (NZP) CSI-RS that is not configured with repetition parameters, and TRS-Info is configured as true among the CSI-RSs. The third configuration in table 20 may be for aperiodic TRS.
TABLE 20
Table 21 shows an effective TCI state configuration when the target antenna port is CSI-RS of CSI. The CSI-RS of CSI is an NZP CSI-RS that is not configured with a parameter indicating repetition (e.g., a repetition parameter), and trs-Info is not configured as true among CSI-RSs.
TABLE 21
Table 22 shows the effective TCI state configuration when the target antenna port is CSI-RS of the BM (i.e., the same meaning as the CSI-RS reported by the L1 RSRP). The CSI-RS of the BM is an NZP CSI-RS whose repetition parameter is configured to have an on or off value, and trs-Info is not configured to be true.
TABLE 22
Table 23 shows the effective TCI state configuration when the target antenna port is PDCCH DMRS.
TABLE 23
Table 24 shows the effective TCI state configuration when the target antenna port is PDCCH DMRS.
TABLE 24
In the representative QCL configuration method based on tables 20 to 24, the target antenna port and the reference antenna port of each step are configured and operated as CSI-RS of "SSB" - > "TRS" - > "CSI, CSI-RS of BM, PDCCH DMRS, or PDSCH DMRS".
PDCCH: DCI correlation
TCI state combinations that may be applied to PDCCH DMRS antenna ports are shown in table 25 below. In table 25, the fourth row is a combination assumed by the UE before RRC configuration, and configuration after RRC is not possible.
TABLE 25
Fig. 8 illustrates a method of allocating a TCI state for a PDCCH in a wireless communication system according to an embodiment. Specifically, in a wireless communication system, a hierarchical signaling method as shown in fig. 8 is supported for dynamic allocation of PDCCH beams.
Referring to fig. 8, the bs may configure N TCI states 805, 810 in the UE through RRC signaling 800, and configure some of them as TCI states of CORESET, as indicated by reference numeral 825. Thereafter, the BS may indicate one of TCI states 830, 835 and 840 of CORESET to the UE through MAC CE signaling, as indicated by reference numeral 845. Subsequently, the UE may receive the PDCCH based on beam information included in the TCI state indicated by the MAC CE signaling.
Fig. 9 illustrates a TCI indication MAC CE indication signaling structure of PDCCH DMRS in a wireless communication system according to an embodiment.
Referring to fig. 9, TCI of pdcch DMRS indicates that MAC CE signaling includes 2 bytes (16 bits), and includes a serving cell ID 915 of 5 bits, a CORESET ID 920 of 4 bits, and a TCI status ID 925 of 7 bits.
Fig. 10 illustrates a CORESET and search space beam configuration in a wireless communication system in accordance with an embodiment.
Referring to fig. 10, the bs may indicate one of TCI status lists included in the configuration of the CORSET 1000 through MAC CE signaling, as indicated by reference numeral 1005. Thereafter, the UE may consider the same QCL information (beam # 1) 1005 to be applied to one or more search spaces 1010, 1015, and 1020 associated with CORESET before indicating another TCI state to the corresponding CORESET through other MAC CE signaling. However, the PDCCH beam allocation method has difficulty in indicating a beam change earlier than the MAC CE signaling delay, and has a disadvantage in that the same beam is applied to all CORESET regardless of the search space characteristics. Thus, this makes flexible PDCCH beam operation difficult.
Hereinafter, embodiments of the present disclosure are described that provide more flexible PDCCH beam configurations and methods of operation. In the following embodiments, some distinguishing examples are provided for convenience of description, but they are not exclusive and may be applied by appropriate combinations thereof as appropriate.
The BS may configure one or more TCI states of a specific CORESET in the UE and activate one of the configured TCI states through a MAC CE activation command. For example, { TCI state #0, TCI state #1, TCI state #2} is configured as a TCI state in CORESET #1, and the BS may transmit a command for activating TCI state #0, which is assumed to be the TCI state of CORESET #1, to the UE through the MAC CE. By means of an activation command of the TCI state received through the MAC CE, the UE can correctly receive the DMRS of the corresponding CORESET based on QCL information within the activated TCI state.
When the UE does not receive a MAC CE activation command of the TCI state of coreset#0 having CORESET (coreset#0) of index 0, the UE may assume that DMRS transmitted in coreset#0 performs QCL with SS/PBCH blocks identified in an initial access procedure or a non-contention-based random access procedure that is not triggered by a PDCCH command.
When the UE does not receive the configuration of the TCI state of coreset#x or the UE receives the configuration of one or more TCI states, but does not receive a MAC CE activation command for activating one of them, the UE may assume that the DMRS transmitted in coreset#x performs QCL with the SS/PBCH block identified in the initial access procedure.
PDSCH: frequency resource allocation correlation
Fig. 11 illustrates a time axis resource allocation of PDSCH in a wireless communication system according to an embodiment. In particular, fig. 11 illustrates three frequency axis resource allocation methods of type 0 1100, type 11105, and dynamic handover 1110, which may be configured by higher layers in a wireless communication system.
Referring to fig. 11, when a UE is configured to use only resource type 0 through higher layer signaling, some DCIs for allocating PDSCH to a corresponding UE include N as indicated by reference numeral 1100 RBG A bitmap of bits. N (N) RBG Is the number of RB groups (RBGs) determined according to the BWP Size allocated by the BWP indicator and the higher layer parameters RBG-Size as shown in table 26 below, and data is transmitted in the RBG indicated as 1 by the bitmap.
TABLE 26
| Bandwidth portion size | Configuration 1 | Configuration 2 |
| 1-36 | 2 | 4 |
| 37-72 | 4 | 8 |
| 73-144 | 8 | 16 |
| 145-275 | 16 | 16 |
When a UE is configured to use only resource type 1 through higher layer signaling, some DCI for allocating PDSCH to the corresponding UE includes, as indicated by reference numeral 1105Bit frequency axis resource allocation information. The BS may configure the starting VRB 1120 and the length 1125 of frequency axis resources consecutively allocated therefrom.
When a UE is configured to use both resource type 0 and resource type 1 through higher layer signaling, some DCIs for allocating PDSCH to the corresponding UE include frequency axis resource allocation information of a larger value 1135 bit among payloads 1115 for configuring resource type 0 and payloads 1120 and 1125 for configuring resource type 1, as indicated by reference numeral 1110. A bit may be added to a first portion (e.g., a Most Significant Bit (MSB)) of frequency axis resource allocation information within the DCI, and may indicate that resource type 0 is used when the corresponding bit is "0" and may indicate that resource type 1 is used when the corresponding bit is "1".
PDSCH time resource allocation correlation
The BS may configure a table of time domain resource allocation information of a downlink data channel (e.g., PDSCH) and an uplink data channel (e.g., PUSCH) in the UE through higher layer signaling (e.g., RRC signaling). A table including maximum maxNrofDL-allocations=16 entries may be configured for PDSCH, and a table including maximum maxNrofUL-allocations=16 entries may be configured for PUSCH. The time domain resource allocation information may include PDCCH to PDSCH slot timing (corresponding to a time interval in units of slots between a time point at which the PDCCH is received and a time point at which the PDSCH scheduled by the received PDCCH is transmitted and indicated by K0) or PDCCH to PUSCH slot timing (corresponding to a time interval in units of slots between a time point at which the PDCCH is received and a time point at which the PUSCH scheduled by the received PDCCH is transmitted and indicated by K2), a position and a length of a starting symbol within a slot at which the PDSCH or PUSCH is scheduled, a mapping type of the PDSCH or PUSCH, and the like. For example, the information shown in table 27 or table 28 may be transmitted from the BS to the UE.
TABLE 27
TABLE 28
The BS may inform the UE of one of the entries in the table of time domain resource allocation information (e.g., indicated by a time domain resource allocation field within the DCI) through L1 signaling (e.g., DCI). The UE may acquire time domain resource allocation information of the PDSCH or PUSCH based on DCI received from the BS.
Fig. 12 illustrates allocation of time axis resources of PDSCH in the wireless communication system according to an embodiment.
Referring to fig. 12, the bs may be according to SCS (μ) using data channels and control channels configured by higher layers PDSCH ，μ PDCCH ) The scheduling offset (K0) value indicates the time axis position of PDSCH resources by OFDM symbol start position 1200 and length 1205 within one slot dynamically indicated by DCI.
Fig. 13 illustrates allocation of time axis resources according to SCS of a data channel and a control channel in a wireless communication system according to an embodiment.
Referring to fig. 13, SCS of the data channel and the control channel are identical to each other (μ PDSCH ＝μ PDCCH ) When, as indicated by reference numeral 1300, the data and the controlled slot numbers are identical to each other, and thus, the BS and the UE may generate a scheduling offset according to a predetermined slot offset K0. However, SCSs of the data channel and the control channel are different from each other (μ PDSCH ≠μ PDCCH ) When, as indicated by reference numeral 1305, the data and the controlled slot numbers are different from each other, and thus, the BS and the UE may generate a scheduling offset according to a predetermined slot offset K0 based on SCS of the PDCCH.
PDSCH: processing time
When the BS transmits PDSCH to the UE through DCI format 1_0_1 or 1_2 scheduling, the UE may need PDSCH processing time to receive PDSCH by applying a transmission method indicated through DCI (modulation/demodulation and coding indication index, DMRS related information, and frequency resource allocation information). In the wireless communication system according to the embodiment of the present disclosure, PDSCH processing time is defined in consideration thereof. For example, the PDSCH processing time of the UE may follow the following equation (3).
T proc，I ＝(N 1 +d 1.1 +d 2 )(2048+144)κ2 -μ T c +T ext
…(3)
In equation (3), each variable may have the following meaning:
-N 1 : based on UE processing capability 1 or 2 and parameter set μtrue based on UE capabilityA fixed number of symbols. When reporting UE processing capability 1 from UE capability report, N 1 May have a value as shown in table 29 and may have a value as shown in table 30 when reporting UE processing capability 2 and configuring information indicating that UE processing capability 2 may be used through higher layer signaling. Parameter set μmay correspond to μ PDCCH 、μ PDSCH Sum mu UL The minimum value in (1) to maximize T proc,1 And mu PDCCH 、μ PDSCH Sum mu UL May be a parameter set of a PDCCH scheduling a PDSCH, a parameter set of a scheduled PDSCH, and a parameter set of an UL channel transmitting HARQ-ACK, respectively.
TABLE 29 PDSCH processing time in PDSCH processing capability 1
TABLE 30 PDSCH processing time in PDSCH processing Capacity 2
-K：64
-T ext : when the UE uses the shared spectrum channel access scheme, the UE may calculate T ext And applies it to PDSCH processing time. Otherwise, assume T ext Is 0.
When indicating the position value of PDSCH DMRS 1 For 12, N1,0 in Table 29 has a value of 14, otherwise has a value of 13.
-when the last symbol of PDSCH is the i-th symbol in the slot used for transmitting PDSCH, and for PDSCH mapping type a, i<At 7, d 1,1 7-i, otherwise, d 1,1 Is 0.
-d 2 : when the PUCCH with the high priority index and the PUCCH or PUSCH with the low priority index overlap in time, d of the PUCCH with the high priority index 2 May be configured as a value reported from the UE. Otherwise, d 2 Is 0.
When PDWhen SCH mapping type B is used for UE processing capability 1, d 1,1 The determination may be made according to the number of symbols L of the scheduled PDSCH and the number of overlapping symbols d between the PDCCH of the scheduled PDSCH and the scheduled PDSCH, as described below.
If L.gtoreq.7, d 1,1 ＝0。
-d if L.gtoreq.4 and L.gtoreq.6 1,1 ＝7-L。
-if l=3, d 1,1 ＝min(d,1)。
-if l=2, d 1,1 ＝3+d。
D when PDSCH mapping type B is used for UE processing capability 2 1,1 The determination may be made according to the number of symbols L of the scheduled PDSCH and the number of overlapping symbols d between the PDCCH of the scheduled PDSCH and the scheduled PDSCH, as described below.
If L.gtoreq.7, d 1,1 ＝0。
-d if L.gtoreq.4 and L.gtoreq.6 1,1 ＝7-L。
In the case of l=2,
d if the PDCCH performing the scheduling is present within a CORESET comprising 3 symbols and the corresponding CORESET and the scheduled PDSCH have the same starting symbol 1,1 ＝3。
-otherwise, d 1,1 ＝d。
-a UE of support capability 2 within a given serving cell may apply PDSCH processing time according to UE processing capability 2 when processsingtype 2Enabled, which is higher layer signaling, is configured as Enabled for the corresponding cell.
When the position of the first uplink transmission symbol of the PUCCH including HARQ-ACK information (e.g., the corresponding position may be considered as K defined as the transmission time point of HARQ-ACK 1 PUCCH resources for HARQ-ACK transmission, timing advance effect) is not earlier than at time T from the last symbol of PDSCH proc,1 The UE should send a valid HARQ-ACK message when the first uplink transmission symbol that occurs later starts. That is, the UE should transmit the PUCCH including the HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the UE cannot provide the PDSC corresponding to the schedule to the BSH effective HARQ-ACK information. T (T) proc，1 Can be used for all normal or extended Cyclic Prefixes (CPs). When the number of PDSCH transmission positions in one slot is 2, d is calculated based on the first PDSCH transmission position in the corresponding slot 1，1 。
PDSCH: reception preparation time in cross-carrier scheduling
Hereinafter, in the case of cross-carrier scheduling, a parameter set μ for transmitting a PDCCH performing scheduling PDCCH And parameter set μ for transmitting PDSCH scheduling corresponding PDCCH PDSCH Different from each other, a PDSCH reception preparation time N of the UE defined for the time interval between PDCCH and PDSCH is described pdsch 。
When mu PDCCH ＜μ PDSCH At this time, the scheduled PDSCH cannot be earlier than N from the last symbol of PDCCH where the corresponding PDSCH is scheduled pdsch The first symbol of the slot that exists after the number of symbols is transmitted. The transmission symbol of the corresponding PDSCH may include DM-RS.
When mu PDCCH ＞μ PDSCH In this case, the scheduled PDSCH may be N from the last symbol of the PDCCH on which the corresponding PDSCH is scheduled pdsch The symbols are then transmitted. The transmission symbol of the corresponding PDSCH may include DM-RS.
TABLE 31N of SCS according to the PDCCH scheduled pdsch ]
| μ PDCCH | N pdseh [ symbol ]] |
| 0 | 4 |
| 1 | 5 |
| 2 | 10 |
| 3 | 14 |
PUSCH: preparation process time
When the BS schedules transmission of PUSCH to the UE by using DCI format 0_0, 0_1, or 0_2, the UE may need PUSCH preparation procedure time to transmit PUSCH by applying a transmission method indicated by DCI (e.g., a transmission precoding method of SRS resources, the number of transmission layers, and a spatial domain transmission filter). In the wireless communication system according to the embodiment of the present disclosure, PUSCH preparation procedure time is defined in consideration thereof. For example, the PUSCH preparation procedure time of the UE may follow the following equation (4).
T proc,2 ＝max((N 2 +d 2，1 +d 2 )(2048+144)κ2 -μ T c +T ext +T switch ，d 2，2 )
…(4)
In equation (4), each variable may have the following meaning.
-N 2 : the number of symbols is determined from the UE processing capability 1 or 2 based on the UE capability and the parameter set μ. When reporting UE processing capability 1 from UE capability report, N 2 May have a value as shown in table 32 and may have a value as shown in table 33 when reporting UE processing capability 2 and configuring information indicating that UE processing capability 2 may be used through higher layer signaling.
TABLE 32
| μ | PUSCH preparation time N 2 [ symbol ]] |
| 0 | 10 |
| 1 | 12 |
| 2 | 23 |
| 3 | 36 |
TABLE 33
| μ | PUSCH preparation time N 2 [ symbol ]] |
| 0 | 5 |
| 1 | 5.5 |
| 2 | Frequency range 1 is 11 |
-d 2，1 : the number of symbols is determined to be 0 when all REs of the first OFDM symbol in the PUSCH transmission include only DM-RS, and is otherwise determined to be 1.
-K：64
- μ: follow mu DL Or mu UL Make T among proc，2 Larger values. Mu (mu) DL Is a downlink parameter set for transmitting a PDCCH including DCI scheduling PUSCH, and μ UL Is an uplink parameter set for transmitting PUSCH.
-T c : with 1/(Δf) max ·N f )，Δf max ＝480·10 3 Hz，N f ＝4096。
-d 2，2 : the BWP switch time is followed when the DCI of the scheduled PUSCH indicates the BWP switch, otherwise, it has 0.
-d 2 : d using PUSCH with high priority index when OFDM symbol of PUCCH, PUSCH with high priority index and PUCCH with low priority index overlap in time 2 Values. Otherwise, d 2 Is 0.
T ext : when the UE uses the shared spectrum channel access scheme, the UE may calculate T ext And applies it to PUSCH processing time. Otherwise, assume T ext Is 0.
-T switch : let T be switch Is the switching interval time when the uplink switching interval is triggered. Otherwise, assume T switch Is 0.
Considering the effects of time axis resource mapping information and uplink-downlink timing advance of PUSCH scheduled by DCI, BS and UE may determine that PUSCH preparation procedure time is insufficient when the first symbol of PUSCH at which CP is at T from the last symbol of PDCCH including DCI scheduling PUSCH starts earlier than the first uplink symbol proc,2 And then starts. Otherwise, the BS and the UE determine that PUSCH preparation procedure time is sufficient. The UE may transmit PUSCH only when PUSCH preparation procedure time is sufficient, and may ignore scheduling of PUSCH when PUSCH preparation procedure time is insufficient.
UE capability reporting correlation
When the UE connects to the serving BS, the UE may perform a procedure for reporting the capability supported by the UE to the corresponding BS. In the following description, this is referred to as UE capability reporting.
The BS may transmit a UE capability query message requesting a capability report from the UE in a connected state. The message may include a UE capability request for each Radio Access Technology (RAT) type of BS. The request for each RAT type may include supported Band Combination (BC) information. Multiple UE capabilities of respective RAT types may be requested through one RRC message container transmitted by the BS, or the BS may insert a UE capability query message including a UE capability request for each RAT type multiple times and transmit it to the UE. That is, the UE capability query may be repeated a plurality of times within one message, and the UE may configure a UE capability information message corresponding thereto and report the message a plurality of times.
In the next generation mobile communication system, UE capability requests for NR, LTE, E-UTRA-NR DC (EN-DC), and multi-RAT DC (MR-DC) can be made. The UE capability query message is typically initially sent after the UE connects to the BS, but may be requested whenever the BS needs the message.
The UE receiving a request for a UE capability report from the BS in the above steps may configure the UE capability according to RAT type and band information requested by the BS.
1. When the UE receives a list of LTE and/or NR bands from the BS through a UE capability request, the UE configures BC for EN-DC and NR independent (SA). That is, the UE configures a candidate list of BC for EN-DC and NR SA based on the requested frequency band in FreqBandList. The frequency bands have sequentially the priorities specified in FreqBandList.
2. When the BS sets the "eutra-NR-only" flag or the "eutra" flag and requests the UE capability report, the UE completely removes NR SABCs from the configured candidate list of BC. Such operation may only occur when an LTE BS (e.g., eNB) requests "eutra" capability.
3. Thereafter, the UE removes the fallback BC from the candidate list of BC configured in the above stage. The fallback BC may be obtained by removing a frequency band corresponding to the at least one SCell from the predetermined BC, and the BC before removing the frequency band corresponding to the at least one SCell may cover the fallback BC, and thus the fallback BC may be omitted. This phase is applied to MR-DC, i.e. LTE band. The BC left after this stage is the final "candidate BC list".
The ue selects a BC in the final "candidate BC list" that is appropriate for the requested RAT type and selects the BC to report. In this stage, the UE configures a supplementadband combination list according to the determined order. That is, the UE configures BC and UE capabilities to be reported according to the order of the preset rate-Type (nr- > eutra-nr- > eutra). Further, the UE configures featureset combination for the configured suppliedband combination list, and configures a list of "candidate feature set combinations" in the candidate BC list, from which a list of fallback BC (including the same or lower stage capabilities) is received. The "candidate feature set combinations" may include all feature set combinations of NR and EUTRA-NR BC, and may be obtained from feature set combinations of UE-NR-Capabilities and UE-MRDC-Capabilities containers.
5. When the requested rate Type is eutra-NR and indexes, the features are included in all two containers of the UE-MRDC-Capabilities and the UE-NR-Capabilities. However, the NR feature set includes only UE-NR-Capabilities.
After configuring the UE capabilities, the UE may communicate a UE capability information message including the UE capabilities to the BS. The BS may perform scheduling and transmission/reception management for the corresponding UE based on UE capabilities received from the UE.
CA/DC correlation
Fig. 14 illustrates a radio protocol structure of BS and UE in single cell, CA and DC in a wireless communication system according to an embodiment.
Referring to fig. 14, the wireless protocols of the wireless communication system include an NR Service Data Adaptation Protocol (SDAP) 1425 or 1470, an NR Packet Data Convergence Protocol (PDCP) 1430 or 1465, an NR Radio Link Control (RLC) 1435 or 1460, and an NR MAC 1440 or 1455 in each of the UE and the NR gNB.
The functions of NR SDAP 1425 or 1470 may include some of the following functions.
User data transfer function (transfer of user plane data)
-mapping quality of service (QoS) flows of UL and DL and functions of data bearers (mapping between QoS flows of DL and UL and Data Radio Bearers (DRBs))
Function of marking QoS flow IDs for uplink and downlink (marking QoS flow IDs in DL and UL packets)
-a function of mapping the reflected QoS flow to data bearers of Uplink (UL) SDAP Protocol Data Units (PDUs) (reflected QoS flow to DRB mapping of UL SDAP PDUs)
Regarding the SDAP layer device, the UE may receive a configuration regarding whether to use a header of the SDAP layer device or a function of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel through an RRC message. If the SDAP header is configured, the NAS reflection QoS 1-bit indicator of the SDAP header and the AS reflection QoS 1-bit indicator may indicate that the UE updates or reconfigures information about the mapping of QoS flows and data bearers in the uplink and downlink. The SDAP header can include QoS flow ID information indicating QoS. The QoS information may be used as data-processing-priority or scheduling information to support seamless services.
The functions of NR PDCP 1430 or 1465 can include some of the following functions
Header compression and decompression function (header compression and decompression: robust header compression only (ROHC))
User data transfer function (transfer of user data)
Sequential delivery function (in-order delivery of upper layer PDUs)
Non-sequential delivery function (unordered delivery of upper layer PDUs)
Reordering function (reordering of PDCP PDU for reception)
Repetition detection function (repetition detection of lower layer Service Data Units (SDUs))
Retransmission function (retransmission of PDCP SDU)
Encryption and decryption functions (encryption and decryption)
Timer-based SDU removal function (timer-based SDU discard in uplink)
The reordering function of the NR PDCP layer device is a function of sequentially reordering PDCP PDUs received from a lower layer based on a PDCP Sequence Number (SN), and may include a function of sequentially transferring the reordered data to a higher layer. The reordering function of the NR PDCP layer device may include a function of directly transmitting data regardless of an order, a function of recording PDCP PDUs lost due to reordering, a function of reporting a status of the lost PDCP PDUs to a transmitting side, and a function of requesting retransmission of the lost PDCP PDUs.
The functions of NR RLC 1435 or 1460 may include some of the following functions.
Data transfer function (delivery of upper layer PDU)
Sequential delivery function (in-order delivery of upper layer PDUs)
Non-sequential delivery function (unordered delivery of upper layer PDUs)
Automatic repeat request (ARQ) function (error correction by ARQ)
Concatenation, segmentation and reassembly functions (concatenation, segmentation and reassembly of RLC SDUs)
Re-segmentation function (re-segmentation of RLC data PDU)
Reordering function (reordering of RLC data PDUs)
-repetition detection function (repetition detection)
Error detection function (protocol error detection)
RLC SDU discard function (RLC SDU discard)
RLC re-establishment function (RLC re-establishment)
The sequential delivery function (in-order delivery) of the NR RLC layer device is a function of sequentially transmitting RLC SDUs received from a lower layer to a higher layer. When the original RLC SDU is divided into a plurality of RLC SDUs and then received, the sequential delivery function (in-sequence delivery) of the NR RLC layer apparatus may include a function of reassembling and transmitting RLC SDUs, a function of reordering received RLC PDUs based on RLC SNs or PDCP SNs, a function of recording RLC PDUs lost due to reordering, a function of reporting the status of the lost RLC PDUs to the transmitting side, and a function of requesting retransmission of the lost RLC PDUs. When there is a missing RLC SDU, the sequential delivery function of the NR RLC layer apparatus may include a function of sequentially delivering only RLC SDUs preceding the missing RLC SDU to a higher layer, or a function of sequentially delivering all RLC SDUs received before the timer starts to a higher layer if a predetermined timer expires even if there is a missing RLC SDU.
Alternatively, the sequential delivery function of the NR RLC layer device may include a function of sequentially delivering all RLC SDUs received so far to a higher layer if a predetermined timer expires even if there is a missing RLC SDU. Further, the NR RLC device may sequentially process RLC PDUs in the order of its reception (e.g., according to the arrival order regardless of sequence numbers or SNs), and may deliver RLC PDUs to the PDCP device regardless of the order thereof (out-of-order delivery).
In the case of segmentation, the NR RLC device may receive the segmentation stored in a buffer or to be received in the future, reconfigure the segmentation to one RLC PDU, process the RLC PDU, and then transmit it to the PDCP device. The NR RLC layer device may not include a concatenation function, and the function may be performed by the NR MAC layer or may be replaced with a multiplexing function of the NR MAC layer.
The non-sequential function (out-of-order delivery) of the NR RLC layer apparatus is a function of delivering RLC SDUs directly received from a lower layer to a higher layer regardless of the order of RLC SDUs, and may include a function of reassembling and transmitting RLC PDUs when one original RLC SDU is divided into a plurality of RLC SDUs and then received, and a function of storing RLC SN or PDCP SN of the received RLC PDUs, reordering RLC PDUs, and recording missing RLC PDUs.
The NR MAC 1440 or 1455 may be connected to a plurality of NR RLC layer devices configured in one UE, and main functions of the NR MAC may include some of the following functions.
Mapping function (mapping between logical channels and transport channels)
Multiplexing and demultiplexing functions (multiplexing/demultiplexing of MAC SDUs)
-scheduling information reporting function (scheduling information reporting)
HARQ functionality (error correction by HARQ)
Logical channel priority control function (priority handling between logical channels of one UE)
UE priority control function (by using priority handling between dynamically scheduled UEs)
-a Multimedia Broadcast Multicast Service (MBMS) service identification function (MBMS service identification)
Transport format selection function (transport format selection)
Filling function (filling)
The NR PHY layer 1445 or 1450 may perform an operation of channel-coding and modulating higher layer data to generate OFDM symbols and may transmit the OFDM symbols through a radio channel or demodulate and channel-decode OFDM symbols received through the radio channel and transmit the demodulated and channel-decoded OFDM symbols to the higher layer.
The detailed structure of the radio protocol structure may be changed differently according to a carrier (or cell) operation scheme. For example, when the BS transmits data to the UE based on a single carrier (or cell), the BS and the UE use a protocol structure having a single structure for each layer, as indicated by reference numeral 1400. However, when the BS transmits data to the UE based on CA using a plurality of carriers in a single Transmission Reception Point (TRP), the BS and the UE may use a protocol structure in which layers up to RLC have a single structure, but PHY layers are multiplexed through a MAC layer, as indicated by reference numeral 1410. As another example, when the BS transmits data to the UE based on DC using a plurality of carriers among a plurality of TRPs, the BS and the UE may use a protocol structure in which layers up to the RLC have a single structure, but PHY layers are multiplexed through a MAC layer, as indicated by reference numeral 1420.
Incoherent joint transmission (NC-JT) correlation
According to an embodiment of the present disclosure, in order to receive PDSCH from multiple TRPs, the UE may use NC-JT.
Unlike the conventional system, the wireless communication system according to the embodiment of the present disclosure can support all of a service having a very short transmission delay, a service requiring a high connection density, and a service requiring a high transmission rate. In a wireless communication network comprising a plurality of cells, TRPs, or beams, cooperative communication (coordinated transmission) between the individual cells, TRPs, or/and beams may satisfy various service requirements by increasing the strength of signals received by UEs or efficiently controlling interference between cells, TRPs, or/and beams.
JT is a representative transmission technique for cooperative communication, and may increase the strength or throughput of a signal received by a UE by transmitting a signal to one UE via different cells, TRPs, or/and beams. The channel between each cell, TRP or/and beam and the UE may have different characteristics, in particular NC-JT supporting non-phase interference coding between the respective cells, TRP or/and beams may need separate precoding, MCS, resource allocation and TCI indication according to the channel characteristics of each cell, TRP or/and beam and each link between the UE.
NC-JT may be applied to at least one of a downlink data channel (e.g., PDSCH), a downlink control channel (e.g., PDCCH), an uplink data channel (e.g., PUSCH), and an uplink control channel (e.g., PUCCH). In PDSCH transmission, transmission information such as precoding, MCS, resource allocation, and TCI may be indicated by DL DCI and should be indicated independently for each cell, TRP, or/and beam of NC-JT. However, this may increase the payload required for DL DCI transmission, which may have an adverse effect on the reception performance of the PDCCH for transmitting DCI. Therefore, in order to support JT of PDSCH, a careful design tradeoff between DCI information amount and reception performance of control information is required.
Fig. 15 illustrates antenna ports and resource allocation for cooperative communication in a wireless communication system according to an embodiment. Specifically, in fig. 15, an example of PDSCH transmission is described for each scheme of JT, and an example of radio resource allocation for each TRP is described.
Referring to fig. 15, an example 1500 of coherent JT (C-JT) supporting coherent precoding between individual cells, TRPs, or/and beams is shown.
In the case of C-JT, TRP AN1505 and TRP B1510 transmit a single data (e.g., PDSCH) to UE 1515, and multiple TRPs may perform joint precoding. Accordingly, TRP a 1505 and TPR B1510 may transmit DMRS through the same DMRS port in order to transmit the same PDSCH. For example, TRP a 1505 and TPR B1510 may transmit DMRS to the UE through DMRS port a and DMRS port B, respectively. In this case, the UE may receive one piece of DCI information for receiving one PDSCH based on DMRS demodulation transmitted through DMRS ports a and B.
Fig. 15 also shows an example 1520 of NC-JTs supporting non-phase interference coding between individual cells, TPRs, or/and beams for PDSCH transmission.
In the case of NC-JT, PDSCH is transmitted to the UE 1535 for each cell, TPR, or/and beam, and separate precoding may be applied to each PDSCH. Each cell, TRP, or/and beam may transmit a different PDSCH or different PDSCH layer to the UE, thereby improving throughput compared to single cell, TRP, or/and beam transmissions. Furthermore, each cell, TRP or/and beam may repeatedly transmit the same PDSCH to the UE, thereby improving reliability compared to single cell, TRP or/and beam transmissions. For ease of description, cells, TRPs, or/and beams are collectively referred to as TRPs.
Various radio resource allocations may be considered, such as a case 1540 where the frequency and time resources used by the plurality of TRPs for PDSCH transmission are the same, a case 1545 where the frequency and time resources used by the plurality of TRPs do not overlap at all, and a case 1550 where some of the frequency and time resources used by the plurality of TRPs overlap with each other.
To support NC-JT, DCI of various forms, structures, and relationships may be considered to simultaneously allocate multiple PDSCH to one UE.
Fig. 16 shows DCI for cooperative communication in a wireless communication system according to an embodiment. Specifically, fig. 16 shows DCI for NC-JT in a wireless communication system, in which each TRP transmits a different PDSCH or a different PDSCH layer to a UE.
Referring to fig. 16, case #1 1600 is an example in which, in the case where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP #1 to trp# (N-1)) other than the service TRP (TRP # 0) for single PDSCH transmission, control information of the PDSCH transmitted from (N-1) additional TRPs is transmitted independently of control information of the PDSCH transmitted by the service TRP. That is, the UE may acquire control information of PDSCH transmitted from different TRP (TRP #0 to trp# (N-1)) through independent DCI (DCI #0 to dci# (N-1)). Formats between independent DCIs may be the same or different from each other, and payloads between DCIs may also be the same or different from each other. In case #1, the degree of freedom of PDSCH control or allocation may be fully ensured, but when each DCI is transmitted by a different TRP, a difference between DCI coverage may occur and reception performance may deteriorate.
Case #2 1605 is an example in which, in the case where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP #1 to trp# (N-1)) other than the service TRP (TRP # 0) for single PDSCH transmission, control information of PDSCH of (N-1) additional TRPs is transmitted, and each DCI depends on the control information of PDSCH transmitted from the service TRP.
For example, dci#0, which is control information of PDSCH transmitted from service TRP (trp#0), may include all Information Elements (IEs) of DCI format 1_0, DCI format 1_1, and DCI format 1_2, but shortened (supplemental or auxiliary) DCI (sdi) (sdi#0 to sdi# (N-2)) which is control information of PDSCH transmitted from cooperative TRP (trp#1 to trp# (N-1)) may include only some IEs of DCI format 1_0, DCI format 1_1, and DCI format 1_2. Accordingly, the scdci for transmitting the control information of the PDSCH transmitted from the cooperative TPR has a smaller payload than the normal DCI (ncdci) for transmitting the control information related to the PDSCH transmitted from the service TRP, and thus, may include reserved bits as compared to ncdci.
In case #2 1605, the degree of freedom of control or allocation per PDSCH may be limited according to the content of the IE included in the sdi, but the receiving capability of the sdi is better than the nci, and thus the probability of a difference between DCI covers may become lower.
Case #3 1610 is an example in which, in the case where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP #1 to trp# (N-1)) other than the service TRP (TRP # 0) for single PDSCH transmission, one piece of control information of the PDSCH of the (N-1) additional TRP is transmitted, and DCI depends on the control information of the PDSCH transmitted from the service TRP.
For example, in the case of dci#0, which is control information of PDSCH transmitted from service TRP (trp#0), all IEs of DCI format 1_0, DCI format 1_1, and DCI format 1_2 may be included, and in the case of control information of PDSCH transmitted from cooperative TRP (trp#1 to trp# (N-1)), only some of IEs of DCI format 1_0, DCI format 1_1, and DCI format 1_2 may be aggregated in one "shortened (or auxiliary)" DCI (sdi) and transmitted. For example, the sdi may include at least one piece of HARQ-related information, such as frequency domain resource assignment (assignment) and time domain resource assignment of cooperative TRP and MCS. In addition, information not included in the scdci, such as a BWP indicator and a carrier indicator, may follow DCI (dci#0, normal DCI, or ncdci) serving TRP.
In case #3 1610, the degree of freedom of PDSCH control or allocation may be limited according to the content of the IE included in the sdi, but the reception performance of the sdi may be controlled, and case #3 1610 may have less complexity of DCI blind decoding of the UE than case #1 1600 or case #2 1605.
Case #4 1615 is an example in which, in the case where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP #1 to trp# (N-1)) other than the service TRP (TRP # 0) for single PDSCH transmission, control information of PDSCH transmitted from (N-1) additional TRPs is transmitted in the same DCI (long DCI) as that of PDSCH transmitted from the service TRP. That is, the UE may acquire control information of PDSCH transmitted from different TRPs (TRP #0 to trp# (N-1)) through a single DCI. In case #4 1615, the complexity of DCI blind decoding of the UE may not increase, but the degree of freedom of PDSCH control or allocation may be low because the number of cooperative TRPs is limited according to the long DCI payload restriction.
In the following description and embodiments, scdci may refer to various supplemental DCIs, such as shortened DCI including PDSCH control information transmitted in cooperative TRPs, auxiliary DCI, or normal DCI (DCI formats 1_0 and 1_1), and the corresponding description may be similarly applied to various supplemental DCIs unless specific limitations are mentioned.
In the following description and embodiments, case #1 1600, case #2 1605, and case #3 1610, in which one or more DCIs (or PDCCHs) are used to support NC-JT, may be classified as NC-JT based on a plurality of PDCCHs, and case #4 1615, in which a single DCI (or PDCCH) is used to support NC-JT, may be classified as NC-JT based on a single PDCCH. In PDSCH transmission based on multiple PDCCHs, CORESET for scheduling DCI serving TRP (TRP # 0) is separated from CORESET for scheduling DCI of cooperative TRP (TRP #1 to trp# (N-1)).
The method of distinguishing CORESETs may include a distinguishing method by a higher layer indicator of each CORESET and a distinguishing method by a beam configuration of each CORESET. Further, in NC-JT based on a single PDCCH, a single DCI schedules a single PDSCH having a plurality of layers, instead of scheduling a plurality of PDSCHs, and a plurality of layers may be transmitted from a plurality of TRPs. The association between a layer and the TRP transmitting the corresponding layer may be indicated by the TCI of the layer.
In embodiments of the present disclosure, when actually applied, the "cooperative TRP" may be replaced with various terms such as "cooperative panel" or "cooperative beam".
In the embodiments of the present disclosure, "the case of applying NC-JT" may be interpreted differently according to circumstances "the case where the UE receives one or more PDSCH simultaneously in one BWP", "the case where the UE receives PDSCH simultaneously in one BWP based on two or more TCIs", and "the case where the PDSCH received by the UE is associated with one or more DMRS port groups", but for convenience of description, is used by one expression.
The radio protocol structure of NC-JT may be used differently according to TRP development scenarios. For example, when there is no backhaul delay or there is a small backhaul delay between cooperative TRPs, a method using a structure based on MAC layer multiplexing (e.g., CA-type method) may be used similarly to reference numeral 1410 of fig. 14. However, when the backhaul delay between cooperative TRPs is too large to be ignored (for example, when it takes 2ms or more to exchange information such as CSI, scheduling, and HARQ-ACK between cooperative TRPs), a method of ensuring a characteristic robust to delay (for example, a DC-type method) may be used by an independent structure of each TRP from the RLC layer, similar to reference numeral 1420 of fig. 14.
The C-JT/NC-JT supporting UE may receive C-JT/NC-JT related parameters or set values from higher layer configurations and set RRC parameters of the UE based thereon. For higher layer configurations, the UE may use UE capability parameters, such as tci-StatePDSCH. UE capability parameters, such as TCI-StatePDSCH, may define TCI states of PDSCH transmissions, the number of TCI states may be configured as 4, 8, 16, 32, 64 and 128 in FR1, 64 and 128 in FR2, and a maximum of 8 states that may be indicated by the 3 bits of the TCI field of DCI may be configured among the number of configurations by a MAC CE message. The maximum value 128 is a value indicated by the maxnumbermconfigured guard tstatstatepercc within the parameter tci-StatePDSCH included in the capability signaling of the UE. As described above, a series of configuration procedures from higher layer configuration to MAC CE configuration may be applied to a beamforming indication or beamforming change command of at least one PDSCH in one TRP.
Multiple DCI-based multiple TRPs
According to embodiments of the present disclosure, the downlink control channel of NC-JT may be configured based on multiple PDCCHs.
In NC-JT based on multiple PDCCHs, when DCI for scheduling PDSCH of each TRP is transmitted, there may be a separate CORESET or search space for each TRP. The CORESET or search space of each TRP may be configured to be at least one of the following.
Configuration of higher layer index for each CORESET: the CORESET configuration information configured by higher layers may include an index value, and TRP for transmitting PDCCH in the corresponding CORESET may be identified by the index value of each CORESET configuration. That is, in the set of CORESETs having the same higher layer index value, it can be considered that the same TRP transmits a PDCCH or a PDCCH for scheduling a PDSCH of the same TRP is transmitted. The index of each CORESET may be named coresetpoinlindex and the PDCCH may be considered to be transmitted from the same TRP in CORESETs configured with the same coresetpoinlindex value. In CORESET that is not configured with the same coresetpoolndex value, the default value of coresetpoolndex may be considered configured and may be 0.
Configuration of multiple PDCCH-Config: a plurality of PDCCH-configs are configured in one BWP, and each PDCCH-Config may include a PDCCH-Config of each TRP. That is, the CORESET list of each TRP and/or the search space list of each TRP may be included in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config may be considered to correspond to a specific TRP.
Configuration of CORESET beams/beam groups: the TRP corresponding to the corresponding CORESET may be identified by the beam or beam group configured for each CORESET. For example, when the same TCI state is configured in a plurality of CORESETs, it can be considered that the corresponding CORESETs are transmitted through the same TRP, or PDCCHs for scheduling PDSCH of the same TRP are transmitted in the corresponding CORESETs.
Configuration of search space beams/beam groups: beams or beam groups are configured for each search space and the TRP of each search space can be identified by it. For example, when the same beam/beam group or TCI state is configured in a plurality of search spaces, the same TRP may be considered to transmit a PDCCH in the corresponding search space or a PDCCH for scheduling a PDSCH of the same TRP may be transmitted in the corresponding search space.
As described above, by separating CORESET or search space for each TRP, PDSCH and HARQ-ACK may be divided for each TRP, and accordingly an independent HARQ-ACK codebook may be generated for each TRP and independent PUCCH resources may be used.
This configuration may be independent for each cell or BWP. For example, while two different coresetpoolndex values may be configured in a primary cell (PCell), coresetpoolndex values cannot be configured in a particular SCell. In this case, it can be considered that NC-JT is configured in the PCell, but NC-JT is not configured in scells where coresetpoolndex value is not configured.
Multiple TRP based on single DCI
According to embodiments of the present disclosure, the downlink beam of NC-JT may be configured based on a single PDCCH.
In NC-JT based on a single PDCCH, PDSCH transmitted by multiple TRPs may be scheduled by one DCI. As a method of indicating the number of TRPs transmitting the corresponding PDSCH, the number of TCI states may be used. That is, NC-JT based on a single PDCCH may be considered when the number of TCI states indicated by DCI for scheduling PDSCH is 2, and single TRP transmission may be considered when the number of TCI states is 1. The TCI state indicated by the DCI may correspond to one or two TCI states among TCI states activated by the MAC CE. When the TCI state of the DCI corresponds to two TCI states activated by the MAC CE, the TCI code point indicated by the DCI is associated with the TCI state activated by the MAC CE, in which case the number of TCI states activated by the MAC CE corresponding to the TCI code point may be 2.
This configuration may be independent for each cell or BWP. For example, although the maximum number of active TCI states corresponding to one TCI code point is 2 in the PCell, the maximum number of active TCI states corresponding to one TCI code point may be 1 in a specific SCell. It can be considered that NC-JT is configured in the PCell, but NC-JT is not configured in the SCell.
With reference to PDCCH and beam configuration related descriptions, PDCCH retransmission is not supported in Rel-15 and Rel-16 NR currently, and thus it is difficult to achieve required reliability in a scene where high reliability is required such as URLLC. Accordingly, the present disclosure provides a method of improving PDCCH reception reliability of a UE by providing a PDCCH retransmission method through a plurality of TRPs.
In the following description, cells, TRPs, panels, beams or/and transmission directions distinguished by an indicator such as higher layer/L1 parameters of TCI state and spatial relationship information, cell ID, TRP ID or panel ID are generally described as TRPs. Thus, in practical applications, TRP may be replaced with one of the terms as appropriate.
When determining whether to apply the cooperative communication, the UE may use various methods by which the PDCCH(s) of the PDSCH to which the cooperative communication is allocated has a specific format, the PDCCH(s) of the PDSCH to which the cooperative communication is allocated includes a specific indicator informing whether to apply the cooperative communication, the PDCCH(s) of the PDSCH to which the cooperative communication is allocated is scrambled by a specific RNTI, or it is assumed that the cooperative communication is applied to a specific segment indicated by a higher layer. Hereinafter, PDSCH to which cooperative communication is applied by the UE based on conditions similar to the above conditions is referred to as NC-JT case.
Although the embodiments of the present disclosure are described using an example of a 5G system, the embodiments may be applied to other communication systems having similar technical backgrounds or channel forms. For example, mobile communication technologies developed after LTE or LTE-a mobile communication and 5G may be included therein. Accordingly, embodiments of the present disclosure may be applied to other communication systems with some modifications based on determinations by those skilled in the art without departing from the scope of the present disclosure. The disclosure may be applied to FDD and TDD systems.
In the following description of the present disclosure, higher layer signaling may correspond to at least one or a combination of one or more of the following signaling.
-MIB
SIB or SIB X (x=1, 2.)
-RRC
-MAC CE
L1 signaling may correspond to at least one of the following physical layer channels or signaling methods or a combination of one or more.
-PDCCH
-DCI
UE-specific DCI
-group common DCI
-common DCI
Scheduling DCI (e.g., DCI for scheduling DL or UL data)
Non-scheduling DCI (e.g., DCI other than DCI for scheduling downlink or uplink data)
-PUCCH
UCI (uplink control information)
Herein, PDCCH transmission or reception may include DCI transmission or reception through a PDCCH, PDSCH transmission or reception may include data transmission or reception through a PDSCH, and PUSCH transmission or reception may include data transmission or reception through a PUSCH.
Hereinafter, the priorities of a and B are determined in the present disclosure to be expressed differently as selecting one having a higher priority according to a predetermined priority rule and performing an operation corresponding thereto, or omitting (or discarding) an operation on one having a lower priority.
Example 1: PDCCH repeated transmission method based on multiple TRPs
In PDCCH repetition transmission considering a plurality of TRPs, there may be various methods of how each TCI state to be applied to PDCCH transmission for each TRP is applied to various parameters for PDCCH transmission. For example, various parameters for PDCCH transmissions to which different TCI states are applied may include CCEs, PDCCH candidates, CORESET, and search space. In PDCCH retransmission considering a plurality of TRPs, a reception scheme of a UE may include a soft combining and selecting scheme.
For PDCCH retransmission through a plurality of TRPs, five (5) methods are described below, the BS may configure at least one of the five methods in the UE through higher layer signaling, indicate the method through L1 signaling, or configure and indicate the method through a combination of higher layer signaling and L1 signaling. The following methods are merely examples, and the present disclosure is not limited thereto. That is, PDCCH repetition transmission according to the present disclosure may be performed based on a method obtained by combining the following methods.
Method 1-1: method for repeating transmission of multiple PDCCHs having the same payload
Method 1-1 includes repeatedly transmitting a plurality of pieces of control information having the same DCI format and the same payload. The control information may indicate PDSCH for scheduling repeated transmissions (e.g., { pdsch#1, pdsch#2,..pdsch#y }) repeatedly transmitted over a plurality of slots. The same payload of the repeatedly transmitted control information may mean all PDSCH scheduling information of the control information (e.g., number of PDSCH repeated transmissions, time axis PDSCH resource allocation information (i.e., slot offset (K) between the control information and PDSCH #1 0 ) And the number of PDSCH symbols), frequency axis PDSCH resource allocation information, DMRS port allocation information, PDSCH to HARQ-ACK timing, and PUCCH resource indicator) are identical to each other. The UE may improve the reception reliability of the control information by soft-combining the repeated transmission control information having the same payload.
In order to perform soft combining, the UE should know the resource location of the control information to be repeatedly transmitted and the number of repeated transmissions in advance. For this, the BS may indicate time, frequency and spatial resource configurations of the repeatedly transmitted control information in advance. When the control information is repeatedly transmitted on the time axis, the control information may be repeatedly transmitted on different CORESETs, on different sets of search spaces within one CORESET, or on different PDCCH listening occasions within one CORESET and one set of search spaces. The unit of the repeated transmission resource (CORESET unit, search space set unit, or PDCCH listening occasion unit) and the location of the repeated transmission resource (e.g., PDCCH candidate index) on the time axis may be indicated by higher layer configuration of the BS. The number of PDCCH retransmission and/or the list of TRPs participating in the retransmission and the transmission mode may be explicitly indicated, and higher layer indication or MAC-CE/L1 signaling may be used as an explicit indication method. The list of TRPs may be indicated by the TCI state or in the form of QCL hypotheses.
When the control information is repeatedly transmitted on the frequency axis, the control information may be repeatedly transmitted on a different CORESET, on a different PDCCH candidate within one CORESET, or for each CCE. The units of the resources repeatedly transmitted on the frequency axis and the positions of the repeatedly transmitted resources may be indicated by higher layer configuration. Further, the number of repeated transmissions and/or a list of TRPs participating in the repeated transmissions and a transmission mode may be explicitly indicated, and higher layer indication or MAC-CE/L1 signaling may be used as an explicit indication method. The list of TRPs may be indicated by the TCI state or in the form of QCL hypotheses.
When the control information is repeatedly transmitted on the spatial axis, the control information may be repeatedly transmitted on different CORESETs, or two or more TCI states may be configured in one CORESET, and the control information may be repeatedly transmitted.
Methods 1-2: method for repeatedly transmitting a plurality of pieces of control information having different DCI formats and/or payloads
The method 1-2 includes repeatedly transmitting a plurality of pieces of control information having different DCI formats and/or payloads. The control information schedules the repeated transmission PDSCH, and the number of PDSCH repeated transmissions indicated by each piece of control information may be different. For example, while pdcch#1 may indicate information of scheduling { pdsch#1, pdsch#2,..the pdsch#y }, pdcch#2 may indicate information of scheduling { pdsch#2,.., pdsch#y }, and pdcch#x may indicate information of scheduling { PDSCH Y }. The method of repeatedly transmitting control information has an advantage of reducing the total delay time required for repeated transmission of control information and PDSCH, as compared with the method 1-1.
Using the method 1-2, the ue may not need to know the location of resources of control information to be repeatedly transmitted and the number of repeated transmissions in advance, and may independently decode and process each piece of the repeatedly transmitted control information. When the UE decodes a plurality of pieces of repeatedly transmitted control information scheduling the same PDSCH, only the first repeatedly transmitted control information may be processed, and other repeatedly transmitted control information from the second control information may be ignored.
Alternatively, the BS may indicate the location of the resource of the control information to be repeatedly transmitted and the number of repeated transmissions in advance, and the indication method may be the same as the method described in method 1-1.
Methods 1 to 3: method of repeatedly transmitting each of a plurality of pieces of control information having different DCI formats and/or payloads
Methods 1-3 include repeatedly transmitting each of a plurality of pieces of control information having different DCI formats and/or payloads. Each of the repeatedly transmitted control information may have the same DCI format and payload. Since the pieces of control information in method 1-2 may not be soft-combined, it may have lower reliability than method 1-1, and method 1-1 may have a longer total delay time required for the control information and PDSCH repeated transmission. Method 1-3 uses the advantages of methods 1-1 and 1-2 and control information can be transmitted with higher reliability than method 1-2 while reducing the total delay time required for repeated transmission of control information and PDSCH than method 1-1.
To decode and soft-combine the repeatedly transmitted control information, methods 1-3 may use soft-combining of method 1-1 and separate decoding of methods 1-2. For example, in the repeated transmission of a plurality of pieces of control information having different DCI formats and/or payloads, the first transmitted control information may be decoded by method 1-2 and the repeated transmission of the decoded control information may be soft-combined by method 1-1.
The BS may select and configure one of the methods 1-1, 1-2, or 1-3 for repeated transmission of control information. The method of repeatedly transmitting the control information may be explicitly indicated to the UE through higher layer signaling by the BS.
Alternatively, the method of repeatedly transmitting the control information may be instructed after combination with other configuration information. For example, a higher layer configuration indicating a PDSCH retransmission scheme may be combined with an indication of control information retransmission. When the repeated transmission of PDSCH in the Frequency Division Multiplexing (FDM) scheme is indicated, it may be interpreted that control information is repeatedly transmitted only by the method 1-1, because the delay time of the repeated transmission of PDSCH in the FDM scheme is not reduced by the method 1-2. For similar reasons, when repeated transmission of PDSCH in the intra-slot TDM scheme is indicated, it may be interpreted as repeated transmission of control information by method 1-1. However, when the retransmission of PDSCH in the inter-slot TDM scheme is indicated, method 1-1, method 1-2, or method 1-3 for the retransmission of control information may be selected through higher layer signaling or L1 signaling.
The BS may explicitly indicate a unit of control information retransmission to the UE through a configuration such as a higher layer.
Alternatively, the unit of control information retransmission may be combined with other configuration information and indicated. For example, a higher layer configuration indicating a PDSCH retransmission scheme may be combined with a unit of control information retransmission. When the repeated transmission of PDSCH in the FDM scheme is indicated, it may be interpreted as repeated transmission of control information in the FDM or Space Division Multiplexing (SDM) scheme because if the control information is repeated in the inter-slot TDM scheme, the delay time of the repeated transmission of PDSCH in the FDM scheme is not reduced. For similar reasons, when indicating repeated transmission of PDSCH in the intra-slot TDM scheme, it may be interpreted as repeated transmission of control information in the TDM, FDM or SDM scheme. However, when indicating repeated transmission of PDSCH in the inter-slot TDM scheme, higher layer signaling may be selected for repeated transmission of control information in the inter-slot TDM scheme or the intra-slot TDM, FDM, or SDM scheme.
Methods 1 to 4: PDCCH transmission scheme for applying respective TCI states to different CCEs within the same PDCCH candidate group
In order to improve the reception performance of the PDCCH without PDCCH repetition transmission, methods 1-4 may perform transmission after applying different TCI states, resulting in transmission from multiple TRPs to different CCEs within the PDCCH candidate set. The corresponding scheme is not PDCCH repetition transmission, but the corresponding TRP applies a different TCI state to transmission after a different CCE within the PDCCH candidate set, and thus spatial diversity may be acquired within the PDCCH candidate set. The different CCEs to which the different TCI states are applied may be separated in the time or frequency dimension, and the UE should know in advance the location of the resources to which the different TCI states are applied. The UE may receive different CCEs within the same PDCCH candidate set to which different TCI states are applied and decode the CCEs independently or simultaneously.
Methods 1 to 5: PDCCH transmission scheme (SFN scheme) in which multiple TCI states are applied to all CCEs within the same PDCCH candidate
In order to improve PDCCH reception performance without PDCCH repetition transmission, methods 1-5 may perform transmission in an SFN scheme after applying a plurality of TCI states to all CCEs within a PDCCH candidate set. The corresponding scheme is not PDCCH repetition transmission, but rather spatial diversity is acquired through SFN transmission at the same CCE locations within the PDCCH candidate set. The UE may receive CCEs within the same PDCCH candidate set to which different TCI states are applied at the same location, and independently decode the CCEs by using some or all of the plurality of TCI states, or simultaneously decode the CCEs.
Example 2: restriction of maximum number of PDCCH candidate groups and CCEs according to PDCCH retransmission method
According to an embodiment of the present disclosure, a limitation of the maximum number of PDCCH candidate sets and CCEs according to a PDCCH repetition transmission method considering a plurality of TRPs is described. The UE may report supportable methods among methods 1-1 to 1-5 for PDCCH repetition transmission of the BS through the UE capability alone. The UE may report information indicating whether soft combining of the UE reception scheme for PDCCH repetition transmission is supported through the UE capability. Further, the UE may report UE capabilities for restrictions on the maximum number of PDCCH candidate sets and the maximum number of CCEs according to PDCCH repetition transmission. The corresponding UE capabilities may include a restriction on each slot, a restriction on each of a plurality of slots, a restriction on each span, and a restriction on each of a plurality of spans. Further, the UE may report a scheme for counting the number of CCEs and a PDCCH candidate set of supportable methods among PDCCH repetition transmission methods through the UE capability.
The scheme for counting the number of PDCCH candidate sets and CCEs may vary according to UE capability reports and transmission conditions of the BS.
Fig. 17 is a flowchart illustrating an operation in which a UE counts the number of PDCCH candidate sets and the number of CCEs according to a UE capability report in PDCCH repetition transmission and whether BS transmission conditions are satisfied in a wireless communication system according to an embodiment.
Referring to fig. 17, in step 1700, the UE reports UE capabilities related to PDCCH repetition transmission to the BS. The available UE capability report may include information on at least one of a PDCCH retransmission scheme (e.g., one of methods 1-1 to 1-5), whether soft combining according to PDCCH retransmission is supported, PDCCH candidates, a method of counting the number of CCEs, the maximum number of PDCCH candidates and CCEs per slot/slots and per span/spans, an oversubscription scheme, and new UE processing capability. Alternatively, step 1700 may be omitted when information about UE capabilities is preconfigured for the corresponding UE. In addition, when the same default information is applied as information on UE capabilities for UEs in a predetermined group, step 1700 may be omitted.
In step 1701, the UE receives first configuration information of a PDCCH from the BS.
In step 1702, the UE receives second configuration information for PDCCH repetition transmission. The second configuration information may include at least one piece of information such as a retransmission method, the number of retransmission, a retransmission interval, a retransmission period, a PDCCH listening occasion on which retransmission is assumed, and whether a link or association between retransmission can be identified. The UE may receive at least some of the first configuration information and the second configuration information through L1 signaling or implicitly determine at least some of them based on other configuration information. Alternatively, the first configuration information and the second configuration information may be included in one piece of configuration information and provided to the UE.
In step 1703, the UE receiving the configuration information recognizes whether the number N of repeated transmissions is greater than 1 (N is an integer).
When the number of repeated transmissions is greater than 1 in step 1703, the UE recognizes whether the BS transmission condition is satisfied in step 1704. The transmission condition may be a combination of at least one of the conditions 2-1 to 2-4 to be described below.
When the number of repeated transmissions is not greater than 1 in step 1703 or when the BS transmission condition is not satisfied in step 1704, the UE operates using a conventional scheme for counting the number of PDCCH candidate groups and the number of CCEs (i.e., using a second scheme for counting the number of PDCCH candidate groups and CCEs) in step 1706. The number of repeated transmissions in step 1703 corresponds to only 1 indicating that repeated transmissions are not performed.
When the BS transmission condition is satisfied in step 1704, the UE uses a first scheme for counting the first PDCCH candidate set and the number of CCEs (i.e., counting the number of PDCCH candidate sets and the number of CCEs) in step 1705. That is, when counting the number of PDCCH candidate groups and the number of CCEs by applying a new reference, if the number of PDCCH repeated transmissions is N, one of the following operations 1 to 3 may be applied.
Operation 1: the number of repeated transmissions N is counted as 1
Even if the UE repeatedly transmits the PDCCH N times according to the UE capability, the UE may consider N repeated transmissions as 1 transmission and count the number of PDCCH candidates and the number of CCEs. For example, in two repetition transmissions, the UE may treat two repeatedly transmitted PDCCHs as one PDCCH and count the number of PDCCHs.
Operation 2: conventional counting scheme
For PDCCH candidates that are repeatedly transmitted N times, the UE may count the number of PDCCH candidate groups or the number of CCEs N times as in the conventional scheme based on an assumption that separate (selective) decoding is performed without performing soft combining. For example, in two repeated transmissions, the UE may count the number of PDCCH candidate groups or the number of CCEs of two different PDCCHs to 2.
Operation 3: count of 2N-1
Based on the assumption that one count is performed every time soft combining is performed on a combination of at least one of PDCCH candidates repeatedly transmitted N times, the UE may count the number of N repeated transmissions to 2N-1. For example, when the UE receives two PDCCH repetition transmissions from the BS, the UE may count the first transmission and the second transmission, respectively, and additionally count yet another transmission based on the assumption of soft combining of the first transmission and the second transmission, thus counting 2 x 2-1=3 in total.
The term, which may be regarded as a condition for counting the number of PDCCH candidate groups and the number of CCEs by application of an operation for applying a new reference, may be a combination of at least one of the following conditions 2-1 to 2-4.
Condition 2-1: whether or not to support soft combining
The UE may count the number of PDCCH candidate sets or the number of CCEs differently according to information indicating whether soft combining is supported or not, which is transmitted to the BS through the capability report. For example, when the UE can support soft combining according to PDCCH repetition transmission, the UE may select one of operations 1 to 3 and count the number of PDCCH candidate groups and the number of CCEs.
When the UE receives a configuration or indication of PDCCH repetition transmission in which soft combining is possible (e.g., the same DMRS positions according to the same scrambling sequence and the same PDCCH candidate group positions according to the same hash function result) from the BS, the UE may select one of operations 1 to 3 and count the number of PDCCH candidate groups and the number of CCEs.
Condition 2-2: presence or absence within the same/different CORESET(s)
The UE may count the number of PDCCH candidate groups and the number of CCEs differently according to whether PDCCHs transmitted from the BS through PDCCH retransmission exist in the same CORESET or different CORESETs. That is, the UE may select one of operations 1 to 3 and perform a counting operation according to whether PDCCHs transmitted from the BS through PDCCH repetition transmission exist in the same CORESET or different CORESETs.
Conditions 2 to 3: PDCCH repeat transmission scheme
The UE may count the number of PDCCH candidate groups and the number of CCEs differently according to a PDCCH repetition transmission scheme (e.g., at least one of methods 1-1 to 1-5). When the PDCCH repetition transmission schemes according to methods 1-1 and 1-3 in which soft combining is possible are configured in the UE and indicated to the UE by the BS, and when the number of PDCCH candidate groups and the number of CCEs are counted for the repetition transmission scheme according to methods 1-4 and 1-5 (i.e., the PDCCH transmission scheme based on a plurality of TRPs that are not repeated is considered), the UE may apply a new reference (i.e., a first scheme for counting the number of PDCCH candidate groups and the number of CCEs) to an operation for counting the number of PDCCH candidate groups and the number of CCEs.
Conditions 2 to 4: the number of TCI states applied or whether the same/different TCI state(s) are applied
The UE may count the number of PDCCH candidate sets and the number of CCEs differently according to the number of TCI states applied to the PDCCH transmitted from the BS or whether the same or different TCI states are applied. That is, the UE may select one of operations 1 to 3 and perform a counting operation according to the number of TCI states applied to the PDCCH transmitted from the BS or whether the same or different TCI states are applied.
Example 3: conditions and schemes for changing PDSCH processing time calculation schemes in PDCCH repetition transmissions
According to embodiments of the present disclosure, PDSCH processing time calculation schemes in PDCCH repetition transmission based on multiple TRPs are described. More specifically, the PDSCH processing time may be determined by the following factors.
PDSCH processing time-dependent UE capability report: processing capability 1 or 2
Parameter set for PDCCH, PDSCH and PUCCH transmissions
PDSCH mapping type (a or B)
PDSCH and PDCCH symbol lengths
Number of overlapping symbols between PDCCH and PDSCH
Further, when the PDCCH scheduling the PDSCH is repeatedly transmitted, some or all of the five considered factors are affected by the PDCCH repetition transmission scheme configured in the UE through higher layer signaling, indicated to the UE through L1 signaling, or configured in the UE through a combination of higher layer signaling and L1 signaling and indicated to the UE, and thus the calculation of the PDSCH processing time may be different. As a simple example, when the PDCCH is TDM using two TCI states and repeatedly transmitted, each of the repeatedly transmitted PDCCH symbol length or the number of overlapping symbols between the PDCCH and the PDSCH may need to be redefined. The following describes conditions for changing the PDSCH processing time calculation scheme according to PDCCH repetition transmission.
Condition 3-1: new UE capability reporting related to PDSCH processing time based on PDCCH repetition transmission
The UE may report a new UE capability related to PDSCH processing time according to PDCCH repetition transmission to the BS. The BS and the UE may change the PDSCH processing time calculation scheme by defining new UE processing capabilities according to the new UE capabilities, except for the conventionally defined UE processing capabilities 1 and 2. New UE processing capabilities may be defined and used by UE capability reporting in relation to PDCCH retransmission. That is, information about UE processing capability related to PDSCH processing time is inserted into a UE capability report related to PDCCH repetition transmission and then transmitted to the BS. Herein, the report on the UE capability for PDCCH retransmission may include a report indicating to the BS that the UE is able to calculate a new PDSCH processing time. The UE capability report related to PDCCH retransmission may include information on whether at least one of soft combining according to PDCCH retransmission, a scheme for counting the number of PDCCH candidate sets and CCEs, the maximum number of PDCCH candidates and CCEs per slot/span, an oversubscription scheme, and the maximum number of TCI states that can be applied to PDCCH retransmission is supported.
Condition 3-2: PDCCH repeated transmission method
For the PDCCH retransmission method, the UE may receive its indication through L1 signaling by higher layer from the BS receiving configuration of at least one scheme among methods 1-1 to 1-5, or receive the configuration or indication through higher layer signaling or a combination of L1 signaling, and change the PDSCH processing time calculation scheme according to the corresponding PDCCH retransmission method. For example, in the case of TDM in method 1-1 (i.e., a method of repeatedly transmitting a plurality of PDCCHs having the same payload), FDM in method 1-1, or PDCCH transmission scheme (SFN transmission scheme) in which a plurality of TCI states are applied to all CCEs within the same PDCCH candidate set in method 1-5, the PDSCH processing time calculation scheme of PDSCH scheduled by the repeatedly transmitted PDCCH may be changed, or an existing PDSCH processing time calculation scheme may be used.
Condition 3-3: whether explicit linking between PDCCH retransmissions
The PDSCH processing time calculation scheme may vary according to information about explicit links or associations between repeatedly transmitted PDCCHs, where a UE receives its configuration through higher layer signaling, a UE receives its indication through L1 signaling, or a UE receives its configuration or indication through a combination of higher layer signaling or L1 signaling.
Conditions 3 to 4: method for receiving PDCCH repeated transmission
The PDSCH processing time calculation scheme may vary according to a scheme (such as separate decoding or soft combining) for receiving PDCCH repetition transmissions, where the UE receives its configuration through higher layer signaling, the UE receives its indication through L1 signaling, or the UE receives its configuration or indication through a combination of higher layer signaling or L1 signaling.
Conditions 3 to 5: possibility of applying different parameter sets to PDCCH retransmission, PDCCH retransmission and scheduled PDSCH
When the UE receives the downlink control channel and the data channel through a plurality of subcarriers having different parameter sets, the UE may receive the repeatedly transmitted PDCCH through the different subcarriers having different parameter sets so as to receive the PDCCH and the PDSCH by efficiently using the available subcarriers. Alternatively, the UE may receive the repeated PDCCH in one subcarrier having one parameter set and receive the PDSCH indicated by the corresponding PDCCH through another subcarrier having a different parameter set from the parameter set of the subcarrier receiving the PDCCH. That is, the UE may change the PDSCH processing time calculation scheme when scheduling subcarriers with different parameter sets.
The PDSCH processing time calculation scheme may be changed by a combination of one or more of conditions 3-1 to 3-5. For example, the calculation method for determining the changeable PDSCH processing time includes the following schemes 3-1 to 3-4.
Scheme 3-1: new N based on PDSCH processing time dependent new UE capability reporting 1 Definition of (2)
Scheme 3-1 may use equation (3) in the same manner as described above, but also uses N among variables that are not yet in equation (3) 1 A new value is defined. Can be N 1 The newly defined values may vary according to the parameter set, as shown in Table 34 below, and X 1 To X4 may be a time unit in symbols (e.g., X 1 To X 4 Is a symbol offset equal to or less than two slots in length and may have a value of one of 1 to 28 symbols). Furthermore, a new N according to a new UE capability report may be applied only after higher layer configuration information is received 1 Values.
Table 34-N which may be newly defined based on new UE capability reports 1 ]
Scheme 3-2: d according to PDCCH repeat transmission 1,1 New definition of (2)
Scheme 3-2 newly defining d 1,1 Which is a value included in a PDSCH processing time calculation equation according to the PDCCH repetition transmission scheme. As described above, d may be differently determined according to PDSCH mapping type a or B 1,1
For example, when PDSCH mapping type a is configured, the last symbol of PDSCH scheduled by PDCCH repetition transmission is the i-th symbol in a slot for transmitting PDSCH, i<Y 1 ，d 1,1 Is Y 1 -i, otherwise d 1,1 Is 0.Y is Y 1 May have a value of one of 7 to 14 symbols.
As another example, when configuring the PDSCH mapping type B, d is determined according to the length L of the scheduled PDSCH and the number d of overlapping symbols between the scheduled PDSCH and the PDCCH scheduling the corresponding PDSCH 1,1 . When the PDCCH is repeatedly transmitted, the reference value of L may be redefined. Similarly, for UE processing capability 1 or 2, d 1,1 May be different.
In the case of performing PDCCH retransmission and corresponding to UE processing capability 1,
-if L.gtoreq.Y 1 D is then 11 ＝0。
-if L.gtoreq.Y 2 And L is less than or equal to Y 1 -1, then d 1,1 ＝Y 1 -L。
-if l=y 3 D is then 1,1 ＝min(d,Y 4 )。
-if l=y 5 D is then 1,1 ＝Y 6 +d。
In case of performing PDCCH repetition transmission and corresponding to UE processing capability 2,
-if L.gtoreq.Y 1 D is then 1,1 ＝0。
-if L.gtoreq.Y 2 And L is less than or equal to Y 1 -1, then d 1,1 ＝Y 1 -L。
-if l=y 5 ，
-if the PDCCH performing the scheduling is present in a CORESET comprising 3 symbols, and the corresponding CORESET and scheduled PDSCH have the same starting symbol, d 1,1 ＝3+Y 7 。
-otherwise, d 1,1 ＝d。
In case of performing PDCCH retransmission and corresponding to UE processing capability 3 based on new UE capability report, the UE may perform d of UE processing capability 1 or 2 according to 1,1 Operate according to the existing definition of UE processing capability 1 or 2 1,1 Operates on new definitions of (a). Y is Y 1 To Y 6 May have one of 1 to 14 symbols of UE processing capabilities 1 to 3. For example, when the UE is according to d 1,1 When operating with the existing definition of (c), Y 1 ＝7，Y 2 =4, as described above. Y is Y 3 ＝3，Y 4 ＝1，Y 5 ＝2，Y 6 ＝3，Y 7 ＝0。
As another example, when the PDSCH mapping type B is configured, the number d of overlapping symbols between the scheduled PDSCH and the PDCCH in the PDCCH repetition transmission, which schedules the repeated transmission of the corresponding PDSCH, may be newly defined. In the new definition, the following may exist.
Case 3-1: PDCCH repetition transmission based on FDM in method 1-1 or based on SFN in method 1-5
Since FDM is a scheme in which two PDCCH repetition transmissions are performed without overlapping in frequency, and SFN is a scheme in which two PDCCH repetition transmissions are performed in the same frequency and time resources, the two PDCCH repetition transmissions do not use more time resources than a PDCCH single transmission, and thus d may be calculated as the number of overlapping symbols between PDSCH and PDCCH, as originally defined. In the case of FDM or SFN, the PDCCH receiving and decoding process uses less time resources than the PDCCH single transmission, but is more complex or requires a longer time than the PDCCH single transmission. Therefore, in addition to the number of overlapping symbols between PDSCH and PDCCH, which is an existing definition of d, symbol offsets corresponding to several symbols may be considered. For example, d can be newly defined new =d+z, where d is the number of symbols overlapped between PDSCH and PDCCH, and Z is the referenceAdditional symbol offset of the PDCCH repetition transmission and reception scheme is considered.
Case 3-2: TDM-based PDCCH retransmission within a time slot
In the case of TDM-based PDCCH retransmission within a slot, the total time resource length of all PDCCH retransmissions within a slot may be increased compared to a PDCCH single transmission. Therefore, the length of the symbol overlapped between the PDSCH and the PDCCH may also be increased compared to a PDCCH single transmission.
The number of symbols overlapped between the ith PDCCH repetition transmission and the scheduled PDSCH is d rep,i And the total number of repeated transmissions is rep_max, d new ＝d rep,1 +d rep,2 +...+d rep,rep_max . That is, a new definition of d may be used for a value obtained by adding the number of symbols overlapped between the scheduled PDSCH and each PDCCH repetition transmission.
Except d new In addition, an additional symbol offset according to the repeated PDCCH reception scheme may also be considered. For example, d new ＝d rep,1 +d rep,2 +...+d rep,rep_max +z, and Z may be an additional symbol offset in consideration of PDCCH repetition transmission and reception scheme.
Further, only the number of symbols overlapped between the PDCCH transmitted last in time and the scheduled PDSCH may be considered, without considering all the repeatedly transmitted PDCCHs. In this case, d new ＝d rep,rep_max +z, and Z may be an additional symbol offset in consideration of PDCCH repetition transmission and reception scheme, or may have a value of 0.
Case 3-3: in PDCCH repetition transmission based on inter-slot TDM
In case of PDCCH repetition transmission based on inter-slot TDM, PDSCH scheduled by all PDCCH repetition transmission is not transmitted earlier than at least the first symbol of the last PDCCH repetition transmission, and thus d can be calculated using the existing definition considering the symbols overlapped between PDSCH and PDCCH without redefining it similarly to case 3-1. Furthermore, similar to case 3-1, TDM is based between time slotsIn the case of PDCCH repetition transmission, a symbol offset corresponding to several symbols may be considered in addition to the number of symbols overlapped between PDSCH and PDCCH as an existing definition of d according to a reception method of PDCCH repetition transmission. For example, d can be newly defined new =d+z, where d is the number of symbols overlapped between PDSCH and PDCCH, and Z is an additional symbol offset considering PDCCH repetition transmission and reception scheme.
Scheme 3-3: symbol offset d according to PDCCH repetition transmission 3 New definition of (2)
Scheme 3-3 defines an offset in the additional symbol unit when calculating PDSCH processing time from PDCCH repetition transmission. For example, the time taken to decode the final PDCCH according to PDCCH repetition transmission may vary according to various PDCCH reception schemes, control resources and resources of search spaces, and the number of PDCCH candidates, such that a symbol offset is defined for each representative case and considered for calculating PDSCH processing time. For example, when the PDCCH repetition transmission scheme is based on TDM or is separately decoded or soft-combined according to the PDCCH reception scheme, different symbol offset values may be used.
As another example, regarding the time taken for PDCCH decoding, a single symbol offset that can be applied to all cases may be defined and considered for calculating PDSCH processing time without defining symbol offsets for the respective cases. For example, a symbol offset between 1 to 28 symbols additionally considered for calculating PDSCH processing time in PDCCH repetition transmission may be defined regardless of PDCCH repetition transmission scheme and reception scheme. As shown in equation (5) below, additional symbol offset values d may be considered 3 And calculates PDSCH processing time.
T proc，1 ＝(N 1 +d 1，I +d 2 +d 3 )(2048+144)κ2 -μ T c +T ext
…(5)
Scheme 3-4: new time offset T related to PDSCH processing time rep Definition of (2)
When repeating transmission according to PDCCHSchemes 3-4 define offsets in additional time units when calculating PDSCH processing times. For example, according to a PDCCH reception scheme for PDCCH repetition transmission, an absolute time unit may be defined and used without defining an additional PDCCH decoding time in symbol units. The time taken to decode the final PDCCH according to PDCCH repetition transmission may vary according to various PDCCH repetition transmission and reception schemes, resources of control resources and search spaces, and the number of PDCCH candidates, so that a time unit value that can be conservatively applied to all cases may be newly defined and used without separately defining a time unit value for each case. Thus, by additionally defining a new time offset T related to PDSCH processing time in PDCCH repetition transmission rep The following equation (6) may be reflected in an equation of the total PDSCH processing time.
T proc，1 ＝(N 1 +d 1，1 +d 2 )(2048+144)κ2 -μ T c +T ext +T rep
…(6)
Fig. 18 is a flowchart showing an operation of PDSCH processing time calculation by a UE according to a UE capability report in PDCCH repetition transmission and whether BS transmission conditions are satisfied in the wireless communication system according to the embodiment.
Referring to fig. 18, in step 1800, the UE reports UE capabilities related to PDCCH repetition transmission to the BS. The available UE capability report may include information on at least one of a PDCCH retransmission scheme (e.g., one of methods 1-1 to 1-5), whether soft combining according to PDCCH retransmission is supported, PDCCH candidates, a method of counting the number of CCEs, the maximum number of PDCCH candidates, and the number of CCEs per slot/slots and per span/spans, an oversubscription scheme, and new UE processing capability.
Alternatively, step 1800 may be omitted when information about UE capabilities is preconfigured for the corresponding UE, or when the same default information is applied as information about UE capabilities for UEs in a predetermined group.
In step 1801, the UE receives first configuration information of a PDCCH from the BS
In step 1802, the UE receives second configuration information for PDCCH repetition transmission. The second configuration information may include at least one piece of information such as a retransmission method, the number of retransmission, a retransmission interval, a retransmission period, a PDCCH listening occasion on which retransmission is assumed, and whether a link or association between retransmission can be identified. The UE may receive at least some of the first configuration information and the second configuration information through L1 signaling or implicitly determine at least some of them based on other configuration information. Alternatively, the first configuration information and the second configuration information may be included in one piece of configuration information and provided to the UE.
In step 1803, the UE identifies whether the number N of repeated transmissions is greater than 1 (N is an integer).
When the number of repeated transmissions is greater than 1 in step 1803, the UE identifies whether BS transmission conditions are satisfied in step 1804. The transmission condition may be a combination of at least one of the conditions 3-1 to 3-5 as described above.
When the BS transmission condition is not satisfied in step 1804 or when the number of repeated transmissions is not greater than 1 in step 1803, the UE operates based on a conventional PDSCH processing time calculation scheme (i.e., a second PDSCH processing time calculation scheme) in step 1806. The number of repeated transmissions corresponding to 1 may indicate that no repeated transmission is performed.
However, when the BS transmission condition is satisfied in step 1804, the UE operates by applying a new scheme (i.e., a first PDSCH processing time calculation scheme) to the PDSCH processing time calculation scheme in step 1805.
When calculating the PDSCH processing time by applying a new reference, when the number of pdcch repeated transmissions is N, a combination of at least one of schemes 3-1 to 3-4 may be applied
The PDSCH processing time in PDCCH repetition transmission is described in detail by the following detailed embodiment, taking a combination of at least one of conditions 3-1 to 3-5 and at least one of schemes 3-1 to 3-4 as an example.
Example 3-1: according to conditions and calculation schemesPDSCH processing time for a particular combination
Embodiment 3-1 includes PDSCH processing time according to a specific combination of conditions 3-1 to 3-5 and some of schemes 3-1 to 3-4. Various combinations of conditions and schemes considered in this embodiment can be described below.
Conditions (conditions)
-PDCCH repetition transmission method: PDCCH retransmission based on TDM within time slot in method 1-1
Presence of explicit connection between PDCCH retransmissions
Availability of soft combining in reception of PDCCH retransmission
Scheme for the production of a semiconductor device
-new d based on PDCCH repetition transmission 1,1 Definition of (2)
Based on the assumption that UE capability corresponding to UE processing capability 1 is performed and PDSCH mapping type B is used, this embodiment corresponds to case 3-2 in scheme 3-2 (in intra-slot TDM-based PDCCH repetition transmission in method 1-1). As described above, d 1,1 Can be defined as follows according to PDSCH length L.
-if L.gtoreq.Y 1 D is then 1,1 ＝0。
-if L.gtoreq.Y 2 And L is less than or equal to Y 1 -1, then d 1,1 ＝Y 1 -L。
-if l=y 3 D is then 1,1 ＝min(d new ,Y 4 )。
-if l=y 5 D is then 1,1 ＝Y 6 +d new 。
Let Y be 1 ＝10，Y 2 ＝7。Y 3 ＝6，Y 4 ＝3，Y 5 =5, and Y 6 =6. In case of scheme 3-2, d is as defined in case 3-2 new ＝d rep,1 +d rep,2 +...+d rep,rep_max +Z，d rep,i Is the number of symbols overlapped between the scheduled PDSCH and the i-th PDCCH, and Z is an additional symbol offset in consideration of the PDCCH repetition transmission and reception scheme. Let z=2. However, this is for convenience only The description is given assuming that the embodiment is not limited thereto.
Fig. 19 illustrates d in a PDCCH repetition transmission for expressing TDM based on time slot in a wireless communication system according to an embodiment 1,1 The time axis position of PDCCH and PDSCH of the value of (a).
Referring to fig. 19, based on the above assumption, the number of PDCCH repetition transmission schemes is rep_max=2, and the PDSCH length is l=3. The PDCCHs are TDM and repeatedly transmitted in CORESET #1 1901 and CORESET #2 1902, and a total of 4 positions of PDSCH scheduled based on the repeatedly transmitted PDCCHs are shown as indicated by reference numerals 1903 and 1906.
As shown in fig. 19, d at PDSCH position 1903 rep,1 =3 and d rep,2 =0, at PDSCH position 1904, d rep,1 =2 and d rep,2 =1, at PDSCH position 1905, d rep,1 =1 and d rep,2 =2, and at PDSCH position 1906, d rep,1 =0 and d rep,2 =3. Thus, based on PDSCH positions 1903, 1904, 1905 and 1906, according to equation d new ＝d rep,1 +d rep,2 +Z, in each case d can be new Calculated as 5, and finally d 1,1 ＝min(d new 3) =3. Final T proc,1 By combining the calculated d 1,1 Put into equation (3) above.
The UE may be at time T from the last symbol of PDSCH proc,1 The first symbol thereafter starts to perform an active PUCCH transmission containing HARQ-ACK information. That is, if the first symbol of the PUCCH containing HARQ-ACK information is not earlier than symbol L 1 (L 1 Is defined as where CP is at T proc,1 The first uplink symbol that starts later) the UE may transmit a PUCCH containing valid HARQ-ACK information.
Example 3-2: PDSCH processing time according to specific combination of conditions and calculation schemes
Embodiment 3-2 describes PDSCH processing time according to another specific combination of some of conditions 3-1 to 3-5 and some of schemes 3-1 to 3-4. Various combinations of conditions and schemes considered in this example are described below.
Conditions (conditions)
-PDCCH repetition transmission method: PDCCH retransmission based on TDM within time slot in method 1-1
Presence of explicit connection between PDCCH retransmissions
Availability of soft combining in reception of PDCCH retransmission
Scheme for the production of a semiconductor device
-new d based on PDCCH repetition transmission 1,1 Definition of (2)
-new d based on PDCCH repetition transmission 3 Definition of (2)
Based on the assumption that UE capability corresponding to UE processing capability 1 is performed and PDSCH mapping type a is used, this embodiment corresponds to case 3-2 in scheme 3-2 (in intra-slot TDM-based PDCCH repetition transmission in method 1-1). As described above, when the last symbol of the PDSCH scheduled by PDCCH repetition transmission is the i-th symbol in the slot for transmitting the PDSCH, i <Y 1 ，d 1,1 Is Y 1 -i, otherwise, d 1,1 Is 0.Y is Y 1 May have a value of one of 7 to 14 symbols. Let Y be 1 =10. However, this is merely an assumption for convenience of description and the embodiment is not limited thereto.
Fig. 20 illustrates d in a PDCCH repetition transmission for expressing TDM based on time slot in a wireless communication system according to an embodiment 1,1 The time axis position of PDCCH and PDSCH of the value of (a).
Referring to fig. 20, based on an assumption, the number of PDCCH repeated transmissions is rep_max=2, and the PDSCH length is l=3. The PDCCHs are TDM and repeatedly transmitted in coreset#1 2001 and coreset#2 2002, and a total of 3 positions of the PDSCH scheduled based on the repeatedly transmitted PDCCHs are shown as indicated by reference numerals 2003 and 2005.
As shown in fig. 20, the last symbol of the PDSCH is the 4 th, 9 th and 14 th symbols in the slots for transmitting the PDSCH at PDSCH positions 2003, 2004 and 2005, respectively. Thus, according to equation d 1,1 =10-i, in PDSCH bitsAt positions 2003 and 2004, d 1,1 The values of (2) may be 6 and 1. Further, at PDSCH position 2005, d 1,1 The value of (2) may be 0.
New symbol offset d based on PDCCH repetition transmission 3 Is defined according to the listed schemes and in this embodiment it is assumed that d 3 =2. Final T proc,1 By combining the calculated d 1,1 And d 3 Put into equation (5) above. The UE may be at time T from the last symbol of PDSCH proc,1 The first symbol thereafter starts to perform an active PUCCH transmission containing HARQ-ACK information. That is, if the first symbol of the PUCCH containing HARQ-ACK information is not earlier than symbol L 1 (L 1 Is defined as where CP is at T proc,1 The first uplink symbol that starts later) the UE may transmit a PUCCH containing valid HARQ-ACK information.
Examples 3 to 3: PDSCH processing time according to specific combination of conditions and calculation schemes
Embodiment 3-3 describes PDSCH processing time according to another specific combination of some of conditions 3-1 to 3-5 and some of schemes 3-1 to 3-4.
Conditions (conditions)
New UE capability reporting related to PDSCH processing time based on PDCCH repetition transmissions
-PDCCH repetition transmission method: SFN transmission-based PDCCH retransmission in methods 1-5
Scheme for the production of a semiconductor device
New time offset T related to PDSCH processing time rep Definition of (2)
In this embodiment, a new UE capability report related to PDSCH processing time may be performed, and N according to the corresponding UE capability report may be separately defined 1 . N according to parameter sets used in accordance with new UE capability reporting 1 May be defined according to, for example, table 35 below.
TABLE 35N according to New UE capability report related to PDSCH processing time 1 Definition of (2)]
Examples 3-3 assume X 1 ＝10，X 2 ＝14，X 3 ＝20，X 4 =28 as one example. Further, embodiment 3-3 assumes that PDSCH processing time is calculated in the same manner as the scheme of UE processing capability 2 when performing new UE capability reporting. It is also assumed that PDSCH mapping type B is used and that parameter set μ=0. This corresponds to case 3-1 in scheme 3-2 (FDM-based PDCCH repetition transmission in method 1-1 or SFN-based PDCCH repetition transmission in method 1-5). D in case where PDCCH repetition transmission is performed and in case of corresponding to UE processing capability 2 1,1 Can be calculated as follows.
-if L.gtoreq.Y 1 D is then 1,1 ＝0。
-if L.gtoreq.Y 2 And L is less than or equal to Y 1 -1, then d 1,1 ＝Y 1 -L。
-if l=y 5 ，
D if the PDCCH performing the scheduling is present within a CORESET comprising 3 symbols and the corresponding CORESET and the scheduled PDSCH have the same starting symbol 1,1 ＝3+Y 7 。
-otherwise, d 1,1 ＝d new 。
Examples 3-3 assume Y 1 ＝7、Y 2 ＝4、Y 5 =2 and Y 7 =3 as one example. However, this assumption is merely for convenience of description, and the present embodiment is not limited thereto.
Fig. 21 illustrates d in PDCCH repetition transmission for expressing SFN-based transmission in a wireless communication system according to an embodiment 1,1 The time axis position of PDCCH and PDSCH of the value of (a).
Referring to fig. 21, based on an assumption, the number of PDCCH repeated transmissions is rep_max=2, and the PDSCH length is l=2. PDCCH is repeatedly transmitted based on SFN transmission through 2 TCI states in CORESET #1 2101. Fig. 21 illustrates PDSCH scheduled based on a corresponding PDCCH repeatedly transmittedA total of 3 positions, as indicated by reference numerals 2102 to 2104. The case of l=2 in the case of PDSCH position 2102 corresponds to a case in which the PDCCH performing scheduling exists in CORESET including 3 symbols and the corresponding CORESET and the scheduled PDSCH have the same starting symbol. In addition, d 1,1 =3+3=6, and d 1,1 ＝d new The pass condition is calculated at locations 2103 and 2104. According to the PDCCH repetition transmission and reception scheme, the number of symbols overlapped between the PDCCH and the PDSCH can be increased by d new =d+z, and Z may be assumed to be 3 in this embodiment. Thus, at PDSCH position 2103, d=2, hence d new =5, and at PDSCH position 2104, d=0, hence d new ＝3。
In addition, a new time offset T related to PDSCH processing time is defined rep And in the present embodiment it is assumed that T rep =0.2 ms. Final T proc,1 By combining the determined d 1,1 And T rep Put into equation (6) above.
The UE may be at time T from the last symbol of PDSCH proc,1 The first symbol thereafter starts to perform an active PUCCH transmission containing HARQ-ACK information. That is, if the first symbol of the PUCCH containing HARQ-ACK information is not earlier than symbol L 1 (L 1 Is defined as where CP is at T proc,1 The first uplink symbol that starts later) the UE may transmit a PUCCH containing valid HARQ-ACK information.
Examples 3 to 4: PDSCH processing time according to specific combination of conditions and calculation schemes
Examples 3-4 describe PDSCH processing times according to certain combinations of some of conditions 3-1 through 3-5 and some of schemes 3-1 through 3-4. Various combinations of conditions and schemes considered in this example are described below.
Conditions (conditions)
-PDCCH repetition transmission method: TDM-based, FDM-based, or SFN-based PDCCH transmission in method 1-1
Presence of explicit connection between PDCCH retransmissions
Including both cases where soft combining is available or not available in the reception of PDCCH retransmission.
Scheme for the production of a semiconductor device
-new d based on PDCCH repetition transmission 1,1 Definition of (2)
In embodiments 3-4, it is assumed that UE capability reporting corresponding to UE processing capability 1 is performed and PDSCH mapping type B is used, and embodiments 3-4 may correspond to two of intra-slot TDM based, FDM based, or SFN PDCCH transmissions in method 1-1. As described above, d 1,1 Can be defined as follows according to PDSCH length L
-if L.gtoreq.Y 1 D is then 1,1 ＝0。
-if L.gtoreq.Y 2 And L is less than or equal to Y 1 -1, then d 1,1 ＝Y 1 -L。
-if l=y 3 D is then 1,1 ＝min(d new ,Y 4 )
-if l=y 5 D is then 1,1 ＝Y 6 +d new 。
In examples 3-4, Y can be assumed 1 ＝7，Y 2 ＝4，Y 3 ＝3，Y 4 ＝1，Y 5 =2, and Y 6 =3. Other values may not be excluded.
The UE can repeat transmission according to the PDCCH based on d 1,1 Is used to calculate PDSCH processing time. For example, the UE may calculate d between each PDCCH and PDSCH scheduled by the corresponding PDCCH repetition transmission 1,1 And use d 1,1 To cause d based on among two repeatedly transmitted PDCCHs 1,1 The PDCCH of the larger value of (2) calculates the final PDSCH processing time. In N PDCCH repetition transmissions, d 1,1,(1) To d 1,1,(N) May be d calculated in consideration of the PDSCH and the first PDCCH scheduled by PDCCH repetition transmission 1,1 (d 1,1,(1) ) To d calculated in consideration of PDSCH and nth PDCCH scheduled by PDCCH repetition transmission 1,1 (d 1,1,(n) ). Final d 1,1 Can be determined asMaximum, i.e. d 1,1 ＝max(d 1,1,(1) ,d 1,1,(2) ,...,d 1,1,(N) )。
According to an embodiment, d 1,1 Calculation (d) 1,1 Generating a maximum d among PDCCHs based on all repetitions 1,1 Is calculated and reflected in the PDSCH processing time) may be applied only to the case where the length L of the OFDM symbol of the PDSCH scheduled by PDCCH repetition transmission is from 1 to 14. For example, d 1,1 Calculation (d) 1,1 Generating a maximum d among PDCCHs based on all repetitions 1,1 Calculated and reflected in PDSCH processing time) may be applied only to cases where L is 2 or 3.
As another example, when calculating d for calculating PDSCH processing time 1,1 In this case, the UE may calculate d based on PDCCH having the largest number of OFDM symbols overlapping with the scheduled PDSCH among the repeated PDCCHs 1,1 . When the length L of OFDM symbols of the scheduled PDSCH is 3, if the number of OFDM symbols overlapped between the first PDCCH and PDSCH of 2 PDCCH repetition transmissions is 2 and the number of OFDM symbols overlapped between the second PDCCH and PDSCH is 1, the number of OFDM symbols overlapped between the PDSCH and PDCCH may be determined to be d=2, which is the number of OFDM symbols overlapped most among all the repeated PDCCHs. Final d 1,1 May be calculated as 3+min (d, 1), and the final value may be calculated as 4. Therefore, when all the numbers of the OFDM symbols overlapped between the two repeated PDCCHs and PDSCH are less than or equal to Y 4 At this time, it is possible to use a method according to 3+min (d, Y 4 ) To calculate d 1,1 . However, when the number of OFDM symbols overlapped between one of two repeated PDCCHs and PDSCH is less than or equal to Y 4 And the number of OFDM symbols overlapped between the other PDCCH and the PDSCH is greater than Y 4 In this case, the UE may calculate d based on PDCCH having a larger number of OFDM symbols overlapping with PDSCH 1,1 。
When the length L of OFDM symbols of the scheduled PDSCH is 2, the number of OFDM symbols overlapped between the first PDCCH and PDSCH of 2 PDCCH repetition transmissions is 2, and overlapped between the second PDCCH and PDSCHWhen the number of OFDM symbols of (1) is the number of OFDM symbols overlapped between the PDSCH and the PDCCH may be determined as d=2, which is the number of OFDM symbols overlapped most among all the repeated PDCCHs. Final d 1,1 May be calculated as 3+d and the final value may be calculated as 5. Thus, when the number of OFDM symbols overlapping in time between one of the two repeated PDCCHs and the scheduled PDSCH is greater than the number of OFDM symbols overlapping in time between the other PDCCH and the scheduled PDSCH, the UE may calculate d based on the PDCCH having the greater number of OFDM symbols overlapping with the PDSCH 1,1 . The corresponding scheme may be reported by the UE capability, may be configured by higher layer signaling, may be indicated by L1 signaling, or may be configured and indicated by higher layer signaling and L1 signaling.
In embodiments 3-4, the scheme may be applied when the UE decodes PDCCH retransmission alone after receiving all PDCCH retransmission. When N PDCCH repetition transmissions are received, the separate decoding may include all of the first PDCCH repetition transmission to the nth PDCCH repetition transmission being separately decoded. When at least one of the N decodes is successful, it may be determined that the corresponding PDCCH is successfully decoded.
The UE may report whether the individual decoding scheme is supported by the UE capability or may suggest whether the individual decoding scheme is supported. For example, when the UE reports the number of counted Blind Decodes (BD) for PDCCH repetition transmission as 2, the UE may suggest whether a separate decoding scheme is supported.
As another example, the methods presented in schemes 3-1 to 3-4 or additional schemes do not assume separate decoding schemes of the UE, but may assume soft combining of multiple PDCCH repetition transmissions after they are received. The UE may report whether soft combining is supported by the UE capability or may suggest whether soft combining is supported. For example, the UE may report the number of BD counts for PDCCH retransmission as 3, or may suggest whether soft combining is supported when reporting both 2 and 3. The UE may report 2 corresponding to the number of BD counts for PDCCH repetition transmission and whether soft combining is supported or not together through the UE capability. In addition to the methods presented in schemes 3-1 to 3-4, PDSCH processing time may be calculated according to the following.
Schemes 3-5: using d determined in consideration of PDSCH scheduled and each PDCCH retransmission among all PDCCH retransmissions 1,1 D among a plurality of values of (d) 1,1 Calculating PDSCH processing time
Schemes 3-6: for at d 1,1 Scheme for double counting of corresponding overlapping OFDM symbols when a specific symbol of PDSCH overlaps with two repeated PDCCHs in time in calculation of (a)
Schemes 3-7: d for determining by PDSCH to be transmitted and scheduled by repeating transmission in consideration of each of all PDCCHs 1,1 To determine d to be used in calculating PDSCH processing time 1,1 Scheme (1)
Schemes 3-8: for calculating d according to which value of UE capability related to BD count of the UE is reported 1,1 Schemes of different values of (a)
For example, when the UE reports 2 as BD count in decoding repeated PDCCH through UE capability, the UE may calculate d 1,1 And use d 1,1 Is used to calculate PDSCH processing time. As another example, the UE may calculate d when the UE reports 3 as a BD count in decoding the repeated PDCCH through the UE capability 1,1 And use d 1,1 The PDSCH processing time is calculated by the triple value of (a).
When some PDCCH candidates are not monitored or discarded during PDCCH retransmission (e.g., when SSB and a specific PDCCH candidate overlap each other, the PDCCH candidate may not be monitored), d may be calculated based only on the PDCCH candidates that are not discarded even if one of schemes 3-1 to 3-8 is used 1,1 And this value may be used to calculate PDSCH processing time.
Alternatively, d may be calculated based on one of schemes 3-1 to 3-8 1,1 Regardless of whether there are PDCCH candidates that are not discarded, and this value may be used to calculate PDSCH processing time.
Examples 3 to 5: depending on the conditions and the particular computing schemeCombined PDSCH processing time
Embodiments 3-5 include PDSCH processing times according to certain combinations of some of conditions 3-1 through 3-5 and some of schemes 3-1 through 3-4. Various combinations of conditions and schemes considered in this example are described below.
Conditions (conditions)
-PDCCH repetition transmission method: TDM-based, FDM-based, or SFN-based PDCCH transmission in method 1-1
Presence of explicit connection between PDCCH retransmissions
Including both cases where soft combining is available or not available in the reception of PDCCH retransmission.
Scheme for the production of a semiconductor device
-new d based on PDCCH repetition transmission 1,1 Definition of (2)
In embodiments 3-5, it is assumed that UE capability reporting corresponding to UE processing capability 2 is performed and PDSCH mapping type B is used, and this embodiment may correspond to two of intra-slot TDM based, FDM based, or SFN PDCCH transmissions in method 1-1. As described above, d 1,1 Can be defined as follows according to PDSCH length L.
-if L.gtoreq.Y 1 D is then 1,1 ＝0。
-if L.gtoreq.Y 2 And L is less than or equal to Y 1 -1, then d 1,1 Is the number of OFDM symbols overlapping in time between PDCCH and PDSCH.
-if l=y 3 ，
-if a PDCCH performing scheduling exists including Y 4 Within CORESET of one symbol, and the corresponding CORESET and scheduled PDSCH have the same starting symbol, then d 1,1 ＝Y 4 +Y 5 。
-otherwise, d 1,1 ＝d+Y 6 。
In examples 3 to 5, Y can be assumed 1 ＝7，Y 2 ＝3，Y 3 ＝2，Y 4 ＝3，Y 5 =0, and Y 6 =0. Other values may not be excluded.
The UE can repeat transmission according to the PDCCH based on d 1,1 Is used to calculate PDSCH processing time. For example, the UE may calculate d between each PDCCH and PDSCH scheduled by the corresponding PDCCH repetition transmission 1,1 And use d 1,1 To cause d based on among two repeatedly transmitted PDCCHs 1,1 The PDCCH of the larger value of (2) calculates the final PDSCH processing time. In N PDCCH repetition transmissions, d 1,1,(1) To d 1,1,(N) May be d calculated in consideration of the PDSCH and the first PDCCH scheduled by PDCCH repetition transmission 1,1 (d 1,1,(1) ) To d calculated in consideration of PDSCH and nth PDCCH scheduled by PDCCH repetition transmission 1,1 (d 1,1,(n) ). Final d 1,1 Can be determined as the maximum, i.e. d 1,1 ＝max(d 1,1,(1) ,d 1,1,(2) ,...,d 1,1,(N) )。
According to an embodiment, d 1,1 Calculation (d) 1,1 Generating a maximum d among PDCCHs based on all repetitions 1,1 Is calculated and reflected in the PDSCH processing time) may be applied only to the case where the length L of the OFDM symbol of the PDSCH scheduled by PDCCH repetition transmission is from 1 to 14. For example, d 1,1 Calculation (d) 1,1 Generating a maximum d in PDCCH based on all repetitions 1,1 Calculated and reflected in PDSCH processing time) may be applied only to cases where L is 2 or 3.
As another example, when calculating d for calculating PDSCH processing time 1,1 In this case, the UE may calculate d based on PDCCH having the largest number of OFDM symbols overlapping with the scheduled PDSCH among the repeated PDCCHs 1,1 . When the length L of OFDM symbols of the scheduled PDSCH is greater than or equal to 3 and less than or equal to 6, if the number of OFDM symbols overlapped between the first PDCCH and PDSCH of 2 PDCCH repetition transmissions is 2 and the number of OFDM symbols overlapped between the second PDCCH and PDSCH is 3, the number of OFDM symbols overlapped between the PDSCH and PDCCH may be determined to be 3, which is the number of OFDM symbols overlapped most among all the repeated PDCCHs, at which time, the final d 1,1 Can also be determined to be 3This is the number of OFDM symbols that overlap most among all repeated PDCCHs. When the length L of the OFDM symbol of the scheduled PDSCH is 2 and a specific PDCCH of 2 PDCCH repetition transmissions is transmitted within CORESET having 3 OFDM symbols and has the same starting OFDM symbol as the scheduled PDSCH, d 1,1 Can be regarded as 3. Otherwise (i.e., when a particular PDCCH is not transmitted within CORESET having 3 OFDM symbols or has a different starting OFDM symbol than PDSCH), d 1,1 May be the number of OFDM symbols overlapping in time between the corresponding PDCCH and PDSCH. Thus, when one of the two repeated PDCCHs is transmitted within CORESET having 3 OFDM symbols and has the same starting OFDM symbol as the scheduled PDSCH, d 1,1 May be determined to be 3.
When all two repeated PDCCHs are not transmitted within CORESET having 3 OFDM symbols or have different OFDM symbols from the scheduled PDSCH, d may be determined based on a PDCCH having a larger number of OFDM symbols overlapping the scheduled PDSCH among the two PDCCHs 1,1 . The corresponding scheme may be reported by the UE capability, may be configured by higher layer signaling, may be indicated by L1 signaling, or may be configured and indicated by higher layer signaling and L1 signaling.
In embodiments 3-5, the scheme may be applied when the UE decodes PDCCH retransmission alone after receiving all PDCCH retransmission. When N PDCCH repetition transmissions are received, the separate decoding may include all of the first PDCCH repetition transmission to the nth PDCCH repetition transmission being separately decoded.
When at least one of the N decodes is successful, it may be determined that the corresponding PDCCH is successfully decoded. The UE may report whether the individual decoding scheme is supported by the UE capability or may suggest whether the individual decoding scheme is supported. For example, when the UE reports the number of counted Blind Decodes (BD) for PDCCH repetition transmission as 2, the UE may suggest whether a separate decoding scheme is supported.
As another example, the methods presented in schemes 3-1 to 3-4 or additional schemes do not assume separate decoding schemes of the UE, but may assume soft combining of multiple PDCCH repetition transmissions after they are received.
The UE may report whether soft combining is supported by the UE capability or may suggest whether soft combining is supported. For example, when the UE can report the number of BD counts for PDCCH retransmission as 3 or both 2 and 3, it may be implied whether soft combining is supported. Further, the UE may report 2 corresponding to the number of BD counts for PDCCH repetition transmission and whether soft combining is supported or not together through the UE capability. In addition to the methods presented by schemes 3-1 to 3-4, PDSCH processing time may also be calculated according to schemes 3-5 to 3-8.
When some PDCCH candidates are not monitored or discarded during PDCCH retransmission (e.g., when SSB and a specific PDCCH candidate overlap each other, the PDCCH candidate may not be monitored), d may be calculated based only on the PDCCH candidates that are not discarded even if one of schemes 3-1 to 3-8 is used 1,1 And this value may be used to calculate PDSCH processing time.
Alternatively, d may be calculated based on one of schemes 3-1 to 3-8 1,1 Regardless of whether there are PDCCH candidates that are not discarded, and this value may be used to calculate PDSCH processing time.
Example 4: scheme for calculating PUSCH preparation procedure time in multi-TRP-based PDCCH repetition transmission
A scheme for calculating PUSCH preparation procedure time in multi-TRP-based PDCCH repetition transmission is described. More specifically, the PUSCH preparation procedure time may be determined by the following factors.
PUSCH preparation procedure time-dependent UE capability reporting: processing capability 1 or 2
Parameter set for PDCCH and PUSCH transmissions
BWP change time
Further, when the PDCCH scheduling the PDSCH is repeatedly transmitted, some or all of 3 considered factors are affected by a PDCCH repetition transmission scheme configured in the UE through higher layer signaling, indicated to the UE through L1 signaling, or configured in the UE through a combination of higher layer signaling and L1 signaling and indicated to the UE, and thus the calculation of PUSCH preparation procedure time may become different. For example, when the PDCCH is TDM using 2 TCI states and repeatedly transmitted, and indicates a BWP change other than PUSCH transmission scheduling by a corresponding PDCCH, a point of time at which the BWP change time is applied may need to be redefined in consideration of PDCCH repetition transmission.
The following describes the conditions for changing the PUSCH preparation procedure time calculation scheme according to PDCCH repetition transmission.
Condition 4-1: new UE capability reporting related to PUSCH preparation procedure time based on PDCCH repetition
The UE may report new UE capabilities related to PUSCH preparation procedure time according to PDCCH repetition transmission to the BS. The BS and the UE can change the PUSCH preparation procedure time calculation scheme by defining new PUSCH timing capabilities according to the new UE capabilities, in addition to the conventionally defined PUSCH timing capabilities 1 and 2. The new PUSCH timing capability may be defined and used by the UE capability report related to PDCCH repetition transmission. That is, information on UE capability related to PUSCH preparation procedure time may be inserted into a UE capability report related to PDCCH retransmission and then transmitted to the BS. The report on the UE capability for PDCCH retransmission may include a report indicating to the BS that the UE is a UE capable of calculating a new PUSCH preparation procedure time. The UE capability report related to PDCCH retransmission may include information on whether at least one of soft combining according to PDCCH retransmission, a scheme for counting the number of PDCCH candidate sets and CCEs, the maximum number of PDCCH candidates and CCEs per slot/span, an oversubscription scheme, and the maximum number of TCI states that can be applied to PDCCH retransmission is supported.
Condition 4-2: PDCCH repeated transmission method
For the PDCCH retransmission method, the UE may receive a configuration of at least one of methods 1-1 to 1-5 from the BS through a higher layer, receive an indication thereof through L1 signaling, or receive a configuration or an indication through a combination of higher layer signaling or L1 signaling, and change a PUSCH preparation procedure time calculation scheme according to a corresponding PDCCH retransmission method. For example, in case of TDM in method 1-1 (i.e., a method of repeatedly transmitting a plurality of PDCCHs having the same payload), FDM in method 1-1, or method 1-5 (i.e., a plurality of TCI states are applied to PDCCH transmission schemes (e.g., SFN transmission schemes) of all CCEs within the same PDCCH candidate set), a PUSCH preparation procedure time calculation scheme of PUSCH scheduled by the repeatedly transmitted PDCCH may be changed, or an existing PUSCH preparation procedure time calculation scheme may be used.
Condition 4-3: whether or not an explicit connection is made between PDCCH retransmissions
The PUSCH preparation procedure time calculation scheme may vary according to information about explicit links or associations between the repeatedly transmitted PDCCHs, where the UE receives its configuration through higher layer signaling, its indication through L1 signaling, or its configuration or indication through a combination of higher layer signaling or L1 signaling.
Condition 4-4: method for receiving PDCCH repeated transmission
The PUSCH preparation procedure time calculation scheme may vary according to a scheme for receiving PDCCH repetition transmission, such as decoding alone or soft combining, in which the UE receives its configuration through higher layer signaling, its indication through L1 signaling, or its configuration or indication through a combination of higher layer signaling or L1 signaling.
Conditions 4 to 5: possibility of applying different parameter sets to PDCCH retransmission or PDCCH retransmission and scheduled PDSCH
When the UE receives the downlink control channel and the data channel through a plurality of subcarriers having different parameter sets, the UE may receive the repeatedly transmitted PDCCH through the different subcarriers having different parameter sets so as to receive the PDCCH and the PDSCH by efficiently using the available subcarriers.
As another example, the UE may receive the repeated PDCCH within one subcarrier having one parameter set and transmit the PUSCH scheduled by the corresponding PDCCH through another subcarrier having a different parameter set from the parameter set of the subcarrier receiving the PDCCH. That is, the UE may change the PUSCH preparation procedure time calculation scheme when scheduling subcarriers having different parameter sets.
The PUSCH preparation procedure time calculation scheme may be changed by a combination of at least one of conditions 4-1 to 4-5.
As shown in schemes 4-1 to 4-4, schemes for calculating PUSCH preparation procedure time that can be changed may also be listed.
Scheme 4-1: new N for new UE capability reporting based on PUSCH preparation procedure time correlation 2 Definition of (2)
Scheme 4-1 may likewise use equation (4) above, but may also use N that has not been defined in the variables of equation (4) 2 Is a new value of (c). Can be N 2 The newly defined values may vary according to the parameter set, as shown in Table 36 below, and W 1 To W 4 May be a unit of time in symbols. For example, W 1 To W 4 Is a symbol offset less than or equal to two slots in length and may have a value of one of 1 to 56 symbols. N according to new UE capability report 2 May be applied only after receiving higher layer configuration information.
Table 36-N that may be newly defined based on new UE capability report 2 ]
| μ | PUSCH preparation time N 2 [ symbol ]] |
| 0 | W 1 |
| 1 | W 2 |
| 2 | W 3 |
| 3 | W 4 |
Scheme 4-2: redefinition of BWP change time
Scheme 4-2 redefines BWP change time according to PDCCH repetition transmission. For example, in case of PDCCH repetition transmission based on TDM within a slot in method 1-1, when the existing definition of BWP change time is applied, during slot offset indicated by a time resource allocation field within DCI, the UE cannot perform transmission and reception after the third symbol of a slot for receiving the PDCCH, and thus PDCCH repetition is possible only in 2 CORESETs including 1 symbol, and there may be a very large limit. Therefore, in this case, redefinition of the restrictions in the slot for receiving the PDCCH may be required.
When the UE receives the configuration of the PDCCH repetition transmission scheme through higher layer signaling, receives its indication through L1 signaling, or receives its configuration and indication through higher layer signaling and L1 signaling, and in case of PDCCH repetition transmission based on intra-slot TDM in method 1-1, the UE may perform at least one of the following operations for the BWP change time.
When the UE receives notification of information about the connection (link) between the repeated PDCCHs (e.g., configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, during the slot offset indicated by the time resource allocation field in the DCI, the UE cannot perform transmission and reception after the last symbol of all PDCCH repeated transmission in the slot.
When the UE does not receive notification of information about the connection (or link) between repeated PDCCHs (e.g., configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and only decoding alone is possible, the UE cannot perform transmission and reception after decoding the last symbol of a successful PDCCH in all PDCCH retransmission within a slot during slot offset indicated by a time resource allocation field within the DCI.
When the UE receives notification of information on a connection (link) between repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, if the last symbol of all PDCCH repetition transmissions within a slot exists within 1 to 7 symbols, the UE cannot perform transmission and reception after the last symbol of all PDCCH repetition transmissions within the slot during slot offset indicated by a time resource allocation field within the DCI.
When the UE receives notification of information on a connection (link) between repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, if the last symbol of all PDCCH repetition transmissions within a slot exists within the 7 th to 14 th symbols in all PDCCH repetition transmissions within the slot, after the last symbol, the UE cannot perform transmission and reception before a slot corresponding to a value obtained by adding 1 to a slot offset indicated by a time resource allocation field within the DCI, and cannot perform PUSCH transmission in a slot corresponding to a value obtained by adding 1 to a slot offset indicated by a time resource allocation field within the DCI.
When the UE receives notification of information about the connection (link) between the repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, during the slot offset indicated by the time resource allocation field within the DCI, the UE cannot perform transmission and reception after a specific symbol of a slot for receiving the PDCCH, and the specific symbol may be, for example, the 6 th symbol.
When the UE receives the configuration of the PDCCH repetition transmission scheme through higher layer signaling, receives its indication through L1 signaling, or receives its configuration and indication through higher layer signaling and L1 signaling, and in case of PDCCH repetition transmission based on inter-slot TDM in method 1-1, the UE may perform at least one of the following operations for the BWP change time.
When the UE receives notification of information on the connection (link) between the repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, the UE cannot perform transmission and reception after the last symbol of the PDCCH existing in the last slot of all inter-slot PDCCH retransmission during slot offset indicated by the time resource allocation field within the DCI. PDCCH repetition transmission within each slot may be performed within the first X symbols of the slot, and X may have one value of, for example, 3 to 14.
When the UE does not receive notification of information on the connection (link) between repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and only decoding alone is possible, the UE cannot perform transmission and reception after the last symbol of a successfully decoded PDCCH in all inter-slot PDCCH retransmission during slot offset indicated by a time resource allocation field within the DCI. PDCCH repetition transmission within each slot may be performed within the first X symbols of the slot, and X may have one value of, for example, 3 to 14.
When the UE does not receive notification of information on a connection (link) between repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and only decoding alone is possible, if the mth PDCCH is successfully decoded in all N inter-slot PDCCH repetition transmissions, the UE cannot perform transmission and reception before a slot corresponding to a value obtained by adding N-M to a slot offset indicated by a time resource allocation field within DCI after decoding the last symbol of the successful PDCCH. PDCCH repetition transmission within each slot may be performed within the first X symbols of the slot, and X may have one value of, for example, 3 to 14.
When the UE receives notification of information on a connection (link) between repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, the UE cannot perform transmission and reception before a slot corresponding to a value obtained by adding 1 to a slot offset indicated by a time resource allocation field within the DCI after the last symbol of the PDCCH existing in the last slot of the inter-slot PDCCH repeated transmission. PDCCH repetition transmission within each slot may be performed within the first X symbols of the slot, and X may have one value of, for example, 3 to 14. The UE performs PUSCH transmission in a slot corresponding to a value obtained by adding 1 to a slot offset indicated by a time resource allocation field within the DCI.
When the UE receives the configuration of the PDCCH repetition transmission scheme through higher layer signaling, receives its indication through L1 signaling, or receives its configuration and indication through higher layer signaling and L1 signaling, and in case of the FDM-based PDCCH repetition transmission corresponding to the method 1-1, the UE may perform at least one of the following operations for the BWP change time.
When the UE receives notification of information about the connection (link) between the repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and soft combining is possible, the UE cannot perform transmission and reception after the last symbol for transmitting all the repeated PDCCHs during the slot offset indicated by the time resource allocation field within the DCI. PDCCH repetition transmission may be performed within the first X symbols of a slot, and X may have one value of, for example, 3 to 14.
When the UE receives notification of information about the connection (link) between the repeated PDCCHs (configuration by higher layer signaling, indication by L1 signaling, or configuration and indication by a combination of higher layer or L1 signaling) and only decoding alone is possible, the UE cannot perform transmission and reception after the last symbol for transmitting all the repeated PDCCHs during the slot offset indicated by the time resource allocation field within the DCI. PDCCH repetition transmission may be performed within the first X symbols of a slot, and X may have one value of, for example, 3 to 14.
Scheme 4-3: symbol offset d according to PDCCH repetition transmission 3 New definition of (2)
When the PUSCH preparation procedure time is calculated from PDCCH repetition transmission, scheme 4-3 defines additional offsets in symbol units. For example, the time taken to decode the final PDCCH according to PDCCH repetition transmission may vary according to various PDCCH reception schemes, resources of control resources and search spaces, and the number of PDCCH candidates, so that a symbol offset may be defined for each representative case and considered for calculating PUSCH preparation procedure time. When the PDCCH repetition transmission scheme is based on TDM or is separately decoded or soft-combined according to the PDCCH reception scheme, different symbol offset values may be used.
As another example, regarding the time taken for PDCCH decoding, a single symbol offset that can be applied to all cases may be defined and considered for calculating PUSCH preparation procedure time without defining a symbol offset for each case. A symbol offset between 1 to 28 symbols to be additionally considered for calculating PUSCH preparation procedure time in PDCCH repetition transmission may be defined regardless of PDCCH repetition transmission scheme and reception scheme. As shown in equation (7) below, an additional symbol offset value d may be considered 3 And calculates PUSCH preparation procedure time.
T proc，2 ＝max((N 2 +d 2，1 +d 2 +d 3 )(2048+144)κ2 -μ T c +T ext +T switch ，d 2，2 )
…(7)
Scheme 4-4: new time offset T related to PUSCH preparation procedure time rep Definition of (2)
When the PUSCH preparation procedure time is calculated from PDCCH repetition transmission, schemes 4-4 define additional offsets in symbol units. For example, according to PDCCH reception for PDCCH repetition transmissionIn an aspect, absolute time units may be defined and used without defining additional PDCCH decoding times in symbol units. In particular, the time taken to decode the final PDCCH according to PDCCH repetition transmission may vary according to various PDCCH repetition transmission and reception schemes, resources of control resources and search spaces, and the number of PDCCH candidates, so that a time unit value that can be conservatively applied to all cases may be newly defined and used without separately defining a time unit value for each case. Thus, by additionally defining a new time offset T related to PUSCH preparation procedure time in PDCCH repetition transmission rep The following equation (8) may be reflected in the equation of the total PUSCH preparation procedure time.
T proc，2 ＝max((N 2 +d 2，1 +d 2 )(2048+144)κ2 -μ T c +T ext +T switch +T rep ，d 2，2 )
…(8)
Fig. 22 is a flowchart showing an operation in which a UE calculates PUSCH preparation procedure time according to a UE capability report in PDCCH repetition transmission and whether BS transmission conditions are satisfied in a wireless communication system according to an embodiment.
Referring to fig. 22, in step 2200, the UE reports UE capabilities related to PDCCH repetition transmission to the BS. The available UE capability report may include information on at least one of a PDCCH retransmission scheme (e.g., one of methods 1-1 to 1-5), whether soft combining according to PDCCH retransmission is supported, PDCCH candidates, a method of counting the number of CCEs, the maximum number of PDCCH candidates, and the number of CCEs per slot/slots and per span/spans, an oversubscription scheme, and new UE processing capability.
Alternatively, step 2200 may be omitted when information about UE capabilities is preconfigured for the corresponding UE or when the same default information is applied as information about UE capabilities for UEs in a predetermined group.
In step 2201, the UE receives first configuration information of a PDCCH from the BS.
In step 2202, the UE receives second configuration information for PDCCH repetition transmission. The second configuration information may include at least one piece of information such as a retransmission method, the number of retransmission, a retransmission interval, a retransmission period, a PDCCH listening occasion on which retransmission is assumed, and whether a link or association between retransmission can be identified. Further, the UE may receive at least some of the first configuration information and the second configuration information through L1 signaling, or may implicitly determine at least some of them based on other configuration information.
Alternatively, the first configuration information and the second configuration information may be included in one piece of configuration information and provided to the UE.
In step 2203, the UE identifies whether the number N of repeated transmissions is greater than 1 (N is an integer).
When the number of repeated transmissions is greater than 1 in step 2203, the UE identifies whether BS transmission conditions are satisfied in step 2204. The transmission condition may be a combination of at least one of the conditions 4-1 to 4-5.
When the transmission condition is not satisfied in step 2204 or when the number of repeated transmissions is not greater than 1 in step 2203, the UE operates based on a conventional PUSCH preparation time calculation scheme (i.e., a second PUSCH preparation procedure time calculation scheme) in step 2206. The number of repeated transmissions corresponding to 1 may indicate that no repeated transmission is performed.
When the transmission condition is satisfied in step 2204, the UE operates based on the new PUSCH preparation procedure time calculation scheme (i.e., the first PUSCH preparation procedure time calculation scheme) in step 2205. When the PUSCH preparation procedure time is calculated by applying a new reference, when the number of pdcch repeated transmissions is N, a combination of at least one of schemes 4-1 to 4-4 may be applied
Fig. 23 is a flowchart illustrating a PDCCH repetition transmission operation of a BS in a wireless communication system according to an embodiment.
Referring to fig. 23, in step 2300, a BS receives a report on UE capability related to PDCCH repetition transmission from a UE. The available UE capability report may include information on at least one of a PDCCH retransmission scheme (e.g., one of methods 1-1 to 1-5), whether soft combining according to PDCCH retransmission is supported, PDCCH candidates, a method of counting the number of CCEs, the maximum number of PDCCH candidates, and the number of CCEs per slot/slots and per span/spans, an oversubscription scheme, and new UE processing capability.
Alternatively, step 2300 may be omitted when information about UE capabilities is preconfigured for the corresponding UE, or when the same default information is applied as information about UE capabilities for UEs in a predetermined group.
In step 2301, the BS transmits first configuration information of a PDCCH to the UE.
In step 2302, the BS transmits second configuration information for PDCCH repetition transmission. The second configuration information may include at least one piece of information such as a retransmission method, the number of retransmission, a retransmission interval, a retransmission period, a PDCCH listening occasion on which retransmission is assumed, and information whether a link or association between retransmission can be identified. Further, the BS may transmit at least some of the first configuration information and the second configuration information through L1 signaling.
Alternatively, the BS may insert the first configuration information and the second configuration information into one piece of configuration information and transmit them to the UE. In this case, steps 2301 and 2302 may be performed simultaneously, or in step 2302, the first configuration information and the second configuration information may be inserted into one piece of configuration information and transmitted to the UE.
Additionally, when the number of PDCCH retransmission is not greater than 1 (i.e., when PDCCH retransmission is not performed), step 2302 may be omitted. The information indicating that the PDCCH retransmission is not performed may be included in the second configuration information, or the number of retransmission may be configured to be 1 in the second configuration information and transmitted to the UE. In this case, PDCCH repetition transmission is not performed.
When the number of PDCCH repetition transmissions is greater than 1 (i.e., when PDCCH repetition transmission is performed), the BS repeatedly transmits the PDCCH to the UE based on the first configuration information and the second configuration information in step 2303.
Scheduling PD on PDCCH transmitted to UE in step 2303When SCH, the BS transmits the scheduled PDSCH to the UE in step 2304, and at a time T from the last symbol of the PDSCH in step 2305 proc,1 A valid PUCCH containing HARQ-ACK information is then received from the UE. When the BS transmission condition satisfies the conditions 3-1 to 3-5 or the condition obtained by combining at least one of the conditions 3-1 to 3-5, T proc,1 May be determined by the UE according to schemes 3-1 to 3-8 (i.e., the first PDSCH processing time calculation scheme), and detailed descriptions thereof have been made above and thus omitted herein.
Alternatively, when the BS transmission condition does not satisfy the conditions 3-1 to 3-5 or the condition obtained by combining at least one of the conditions 3-1 to 3-5, T proc,1 May be determined by the UE according to a conventional PDSCH processing time calculation scheme (i.e., a second PDSCH processing time calculation scheme).
When the PDCCH transmitted to the UE in step 2303 schedules the PUSCH, the BS schedules the PUSCH at time T from the last symbol of the PDCCH in step 2306 proc,2 And then receives PUSCH from the UE. When the BS transmission condition satisfies the conditions 4-1 to 4-5 or the condition obtained by combining at least one of the conditions 4-1 to 4-5, T proc,2 May be determined by the UE according to schemes 4-1 to 4-4 (i.e., the first PUSCH preparation procedure time calculation scheme), and detailed description thereof has been made above, and thus is omitted herein.
However, when the BS transmission condition does not satisfy the conditions 4-1 to 4-5 or the condition obtained by combining at least one of the conditions 4-1 to 4-5, T proc,2 May be determined by the UE according to a conventional PUSCH preparation procedure time calculation scheme (i.e., a second PUSCH preparation procedure time calculation scheme).
When the number of PDCCH repeated transmissions is not greater than 1 (i.e., when the number of repeated transmissions is 1 or PDCCH repeated transmissions are not performed), the BS transmits the PDCCH to the UE based on the first configuration information in step 2307.
When the PDCCH transmitted to the UE in step 2307 schedules the PDSCH, the BS transmits the scheduled PDSCH to the UE in step 2308 and at time T from the last symbol of the PDSCH in step 2309 proc,1 A valid PUCCH containing HARQ-ACK information is then received from the UE. T (T) proc,1 May be determined by the UE according to a conventional PDSCH processing time calculation scheme (i.e., a second PDSCH processing time calculation scheme).
However, when the PDCCH transmitted to the UE in step 2307 schedules the PUSCH, the BS schedules the PUSCH in step 2310 at time T from the last symbol of the PDCCH proc,2 And then receives PUSCH from the UE. T (T) proc,2 May be determined by the UE according to a conventional PUSCH preparation procedure time calculation scheme (i.e., a second PUSCH preparation procedure time calculation scheme).
Fig. 24 shows a UE according to an embodiment.
Referring to fig. 24, the UE includes a UE receiver 2400 and a UE transmitter 2410, a memory and a UE processor 2405 (or a UE controller). The UE receiver 2400 and the UE transmitter 2410 may be embodied as a single transceiver. The UE receiver 2400 and UE transmitter 2410, memory and UE processor 2405 may operate according to the above-described communication methods of the UE.
Additionally, elements of the UE are not limited to the examples shown. For example, the UE may include more or fewer elements than those described above. Further, the UE receiver 2400, the UE transmitter 2410, the memory and the processor 2405 may be implemented in the form of a single chip.
The UE receiver 2400 and the UE transmitter 2410 may receive signals from and transmit signals to the BS. The signals may include control information and data. To this end, the transmitter 2410 may include an RF transmitter for up-converting and amplifying the frequency of the transmission signal, and the UE receiver 2400 may house an RF receiver for low-noise amplifying the received signal and down-converting the frequency. However, elements of UE receiver 2400 and UE transmitter 2410 are not limited to RF receivers and RF transmitters.
The UE receiver 2400 may receive signals through a radio channel and output the signals to a processor, and the UE transmitter 2410 may transmit the signals output from the processor through the radio channel.
The memory may store programs and data required for the operation of the UE. Further, the memory may store control information or data included in signals transmitted and received by the UE. The memory may be configured by a storage medium such as Read Only Memory (ROM), random Access Memory (RAM), a hard disk, a compact disk-ROM (CD-ROM), a Digital Versatile Disk (DVD), or a combination of storage media. Multiple memories are also possible.
Processor 2405 may control a series of procedures to allow the UE to operate according to the above-described embodiments. For example, the processor 2405 may control an element of the UE to receive DCI including two layers and simultaneously receive a plurality of PDSCH. The number of the processors 2405 may be plural, and the processors 2405 may perform operations of controlling elements of the UE by executing programs stored in the memory.
Fig. 25 shows a BS according to an embodiment.
Referring to fig. 25, the BS includes a BS receiver 2500, a BS transmitter 2510, a memory, and a BS processor 2505 (or BS controller). The BS receiver 2500 and BS transmitter 2510 may together be embodied as a transceiver. BS receiver 2500, BS transmitter 2510, memory and BS processor 2505 can operate according to a BS communication method.
The elements of the BS are not limited to the examples shown. For example, the BS may include more or fewer elements than those described above. Further, BS receiver 2500, BS transmitter 2510, memory and processor 2505 can be implemented in the form of a single chip.
BS transmitter 2510 and BS receiver 2500 may transmit signals to and receive signals from UEs. The signals may include control information and data. To this end, the BS transmitter 2510 may include an RF transmitter for up-converting and amplifying the frequency of a transmission signal, and the BS receiver 2500 may include an RF receiver for low noise amplifying a reception signal and down-converting the frequency. However, this is merely an example, and the elements of BS transmitter 2510 and BS receiver 2500 are not limited to RF transmitters and RF receivers.
The BS receiver 2500 may receive signals through a radio channel and output the signals to the processor 2505, and the BS transmitter 2510 may transmit signals output from the processor through the radio channel.
The memory may store programs and data required for the operation of the BS. The memory may store control information or data included in signals transmitted and received by the BS. The memory may be configured by a storage medium such as ROM, RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. Furthermore, there may be a plurality of memories.
The processor 2505 may control a series of processes to allow the BS to operate according to the above-described embodiments of the present disclosure. For example, the processor 2505 may configure DCI of two layers including allocation information of a plurality of PDSCH and control each element of the BS to transmit the DCI. The number of the processors 2505 may be plural, and the processors 2505 may perform operations of elements controlling the BS by executing programs stored in the memory.
The methods according to various embodiments described in the claims or specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.
When the method is implemented by software, a computer readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within the electronic device. The at least one program may comprise instructions that cause an electronic device to perform a method according to various embodiments of the present disclosure as defined by the appended claims and/or disclosed herein.
Programs (software modules or software) may be stored in non-volatile memory, including random access memory and flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, CD-ROM, DVD, or other types of optical storage devices or cartridges. Alternatively, any combination of some or all of them may form a memory storing a program. Further, a plurality of such memories may be included in the electronic device.
Further, the program may be stored in an attachable storage device that may access the electronic device through a communication network such as the internet, an intranet, a Local Area Network (LAN), a wide area network (WLAN), a Storage Area Network (SAN), or a combination thereof. Such a storage device may access the electronic device via an external port. Further, a separate storage device on the communication network may access the portable electronic device.
In the above-described embodiments of the present disclosure, elements included in the present disclosure are expressed in singular or plural according to the detailed embodiments presented. However, for convenience of description, singular or plural forms are appropriately selected to the presented case, and the present disclosure is not limited to the elements expressed in singular or plural. Accordingly, an element expressed in a plurality may also include a single element, or an element expressed in the singular may also include a plurality of elements.
The embodiments of the present disclosure described and illustrated in the specification and drawings have been presented to easily explain the technical content of the present disclosure and to aid in the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is apparent to those skilled in the art that other modifications and variations can be made based on the technical idea of the present disclosure. Further, the respective embodiments described above may be employed in combination as required. That is, one embodiment of the present disclosure may be partially combined with other embodiments to operate the BS and the terminal. For example, embodiments 1 and 2 of the present disclosure may be combined with each other to operate a BS and a terminal. Furthermore, although the above embodiments have been described based on an FDD LTE system, other variations of the technical concepts based on the embodiments may also be implemented in other communication systems such as a TDD LTE, 5G or NR system.
In the drawings describing the methods of the present disclosure, the order described does not always correspond to the order in which the steps of each method are performed, and the order relationship between the steps may be changed or the steps may be performed in parallel.
Alternatively, in the drawings describing the methods of the present disclosure, some elements may be omitted, and only some elements may be included therein, without departing from the basic spirit and scope of the present disclosure.
Further, in the methods of the present disclosure, some or all of the contents of each embodiment may be combined without departing from the basic spirit and scope of the present disclosure.
According to the above-described embodiments of the present disclosure, by determining the processing time of the UE in consideration of the repeated transmission of the DL control channel in the wireless communication system, a more efficient communication system can be implemented.
While the present disclosure has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.
Claims (15)
1. A method performed by a terminal in a communication system, the method comprising:
identifying a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repeat transmission;
identifying a Physical Downlink Shared Channel (PDSCH) scheduled by at least one of the first PDCCH or the second PDCCH;
identifying a first d associated with a first PDCCH and PDSCH 1,1 Value of second d associated with second PDCCH and PDSCH 1,1 Maximum d among values 1,1 A value;
based on maximum d 1,1 Values to identify PDSCH processing time; and
Based on the PDSCH processing time, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information for the PDSCH is transmitted to the base station.
2. The method of claim 1, wherein based on the first d 1,1 Value and second d 1,1 Maximum d among values 1,1 The identification of the PDSCH processing time of the value depends on the count value reported by the terminal for blind decoding, and
wherein the first Downlink Control Information (DCI) in the first PDCCH has the same payload as the second DCI in the second PDCCH.
3. A method performed by a terminal in a communication system, the method comprising:
identifying a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repeat transmission, wherein a Physical Uplink Shared Channel (PUSCH) is scheduled by at least one of the first PDCCH or the second PDCCH;
identifying a last symbol of a PDCCH ending later in time from among the first PDCCH and the second PDCCH;
identifying PUSCH preparation time based on the last symbol; and
and sending the PUSCH to the base station based on the PUSCH preparation time.
4. The method of claim 3, wherein a first Downlink Control Information (DCI) in a first PDCCH has the same payload as a second DCI in a second PDCCH.
5. A method performed by a base station in a communication system, the method comprising:
transmitting a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repetition transmission to a terminal;
transmitting a Physical Downlink Shared Channel (PDSCH) scheduled by at least one of the first PDCCH or the second PDCCH to the terminal; and
hybrid automatic repeat request-acknowledgement (HARQ-ACK) information of the PDSCH is received from the terminal,
wherein the HARQ-ACK information is received based on a PDSCH processing time,
wherein the PDSCH processing time is based on a maximum d for the PDSCH processing time 1,1 Value and
wherein, maximum d 1,1 The value is from a first d associated with a first PDCCH and PDSCH 1,1 Value, second d associated with second PDCCH and PDSCH 1,1 Values.
6. The method of claim 5, wherein based on the first d 1,1 Value and second d 1,1 Maximum d among values 1,1 The identification of the PDSCH processing time of the value depends on the count value reported by the terminal for blind decoding, and
wherein the first Downlink Control Information (DCI) in the first PDCCH has the same payload as the second DCI in the second PDCCH.
7. A method performed by a base station in a communication system, the method comprising:
Transmitting a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repetition transmission to a terminal; and
a Physical Uplink Shared Channel (PUSCH) scheduled by at least one of the first PDCCH or the second PDCCH is received from the terminal,
wherein the PUSCH is received based on the PUSCH preparation time, and
wherein the PUSCH preparation time is based on a last symbol of a PDCCH candidate ending later in time among the first PDCCH and the second PDCCH.
8. The method of claim 7, wherein a first Downlink Control Information (DCI) in a first PDCCH has the same payload as a second DCI in a second PDCCH.
9. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller configured to:
identify a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repetition transmission,
identify a Physical Downlink Shared Channel (PDSCH) scheduled by at least one of the first PDCCH or the second PDCCH,
identifying a first d associated with a first PDCCH and PDSCH 1,1 Value of second d associated with second PDCCH and PDSCH 1,1 Maximum d among values 1,1 The value of the sum of the values,
based on maximum d 1,1 Values to identify PDSCH processing time, and
Based on the PDSCH processing time, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information for the PDSCH is transmitted to the base station.
10. The terminal of claim 9, wherein the first d is based on 1,1 Value and second d 1,1 Maximum d among values 1,1 The identification of the PDSCH processing time of the value depends on the count value reported by the terminal for blind decoding, and
wherein the first Downlink Control Information (DCI) in the first PDCCH has the same payload as the second DCI in the second PDCCH.
11. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller configured to:
identifying a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repetition transmission, wherein a Physical Uplink Shared Channel (PUSCH) is scheduled by at least one of the first PDCCH or the second PDCCH,
the last symbol of the PDCCH ending later in time is identified from among the first PDCCH and the second PDCCH,
identifying PUSCH preparation time based on last symbol, and
and sending the PUSCH to the base station based on the PUSCH preparation time.
12. The terminal of claim 11, wherein first Downlink Control Information (DCI) in a first PDCCH has the same payload as second DCI in a second PDCCH.
13. A base station in a communication system, the base station comprising:
a transceiver; and
a controller configured to:
a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with PDCCH repetition transmissions are transmitted to a terminal,
transmitting a Physical Downlink Shared Channel (PDSCH) scheduled by at least one of the first PDCCH or the second PDCCH to the terminal, and
hybrid automatic repeat request-acknowledgement (HARQ-ACK) information of the PDSCH is received from the terminal,
wherein the HARQ-ACK information is received based on a PDSCH processing time,
wherein the PDSCH processing time is based on a maximum d for the PDSCH processing time 1,1 Value and
wherein, maximum d 1,1 The value is from a first d associated with a first PDCCH and PDSCH 1,1 Value, second d associated with second PDCCH and PDSCH 1,1 Values.
14. The base station of claim 13, wherein based on a first d 1,1 Value and second d 1,1 Maximum d among values 1,1 The identification of the PDSCH processing time of the value depends on the count value reported by the terminal for blind decoding, and
wherein the first Downlink Control Information (DCI) in the first PDCCH has the same payload as the second DCI in the second PDCCH.
15. A base station in a communication system, the base station comprising:
A transceiver; and
a controller configured to:
transmitting to a terminal a first Physical Downlink Control Channel (PDCCH) and a second PDCCH associated with a PDCCH repetition transmission, and
a Physical Uplink Shared Channel (PUSCH) scheduled by at least one of the first PDCCH or the second PDCCH is received from the terminal,
wherein the PUSCH is received based on the PUSCH preparation time, and
wherein the PUSCH preparation time is based on a last symbol of a PDCCH candidate ending later in time among the first PDCCH and the second PDCCH.
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| KR10-2020-0187374 | 2020-12-30 | ||
| KR1020210111842A KR20220097166A (en) | 2020-12-30 | 2021-08-24 | Method and apparatus for determination of processing time in wireless communication system |
| KR10-2021-0111842 | 2021-08-24 | ||
| PCT/KR2021/020295 WO2022146082A1 (en) | 2020-12-30 | 2021-12-30 | Method and apparatus for determining processing time of ue in wireless communication system |
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