KR20230138357A - Method and apparatus for transmitting downlink control channel in mobile communication - Google Patents

Abstract

This specification proposes a method for transmitting the downlink control channel and PDCCH of a base station in a 5G wireless access network (hereinafter referred to as NR). In particular, we propose a NR PDCCH transmission method to efficiently apply Dynamic Spectrum Sharing (DSS) technology to support coexistence of LTE and NR.

Description

Method and device for transmitting a downlink control channel in a wireless mobile communication system {METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK CONTROL CHANNEL IN MOBILE COMMUNICATION}

This specification relates to the 3GPP 5G NR system.

As more and more communication devices require larger communication traffic with the passage of time, the next-generation 5G system, which is an improved wireless broadband communication system than the existing LTE system, is required. In this next-generation 5G system, called NewRAT, communication scenarios are divided into Enhanced Mobile BroadBand (eMBB)/Ultra-reliability and low-latency communication (URLLC)/Massive Machine-Type Communications (mMTC).

Here, eMBB is a next-generation mobile communication scenario with characteristics such as High Spectrum Efficiency, High User Experienced Data Rate, and High Peak Data Rate, and URLLC is a next-generation mobile communication scenario with characteristics such as Ultra Reliable, Ultra Low Latency, and Ultra High Availability. (e.g., V2X, Emergency Service, Remote Control), mMTC is a next-generation mobile communication scenario with Low Cost, Low Energy, Short Packet, and Massive Connectivity characteristics. (e.g., IoT).

Accordingly, the disclosure of this specification aims to solve the above-mentioned problems.

This specification proposes a method for transmitting the downlink control channel and PDCCH of a base station in a 5G wireless access network (hereinafter referred to as NR). In particular, we propose a NR PDCCH transmission method to efficiently apply Dynamic Spectrum Sharing (DSS) technology to support coexistence of LTE and NR.

According to the disclosure of this specification, data channels can be efficiently scheduled in a wireless mobile communication system.

Figure 1 illustrates the structure of a radio frame used in NR.
Figure 2 illustrates the slot structure of an NR frame.
Figure 3 illustrates the structure of a self-contained slot.
Figure 4 shows a block diagram of a processor on which the disclosure of the present specification is implemented.
Figure 5 shows a wireless communication device according to an embodiment of the present specification.
Figure 6 illustrates a block diagram of a network node according to an embodiment of the present specification.
Figure 7 illustrates a block diagram of a communication device according to an embodiment of the present specification.

Although this specification describes embodiments using an LTE system, an LTE-A system, and an NR system, these embodiments may be applied to any communication system that falls within the above definition.

In addition, in this specification, the name of the base station may be used as a comprehensive term including remote radio head (RRH), eNB, transmission point (TP), reception point (RP), relay, etc.

The 3GPP-based communication standard includes downlink physical channels corresponding to resource elements that carry information originating from the upper layer, and downlink physical channels corresponding to resource elements that are used by the physical layer but do not carry information originating from the upper layer. Physical signals are defined. For example, a physical downlink shared channel (PDSCH), a physical broadcast channel (PBCH), a physical multicast channel (PMCH), and a physical control format indicator channel (physical control). format indicator channel (PCFICH), physical downlink control channel (PDCCH), and physical hybrid ARQ indicator channel (PHICH) are defined as downlink physical channels, and reference signals and synchronization signals are defined as downlink physical signals. A reference signal (RS), also called a pilot, refers to a signal with a predefined special waveform known to both the gNB and the UE, for example, cell specific RS (cell specific RS), UE- UE-specific RS (UE-RS), positioning RS (PRS), and channel state information RS (CSI-RS) are defined as downlink reference signals. The 3GPP LTE/LTE-A standard corresponds to uplink physical channels corresponding to resource elements carrying information originating from upper layers, and resource elements used by the physical layer but not carrying information originating from upper layers. Uplink physical signals are defined. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are used as uplink physical channels. A demodulation reference signal (DMRS) for uplink control/data signals and a sounding reference signal (SRS) used for uplink channel measurement are defined.

In this specification, PDCCH (Physical Downlink Control CHannel) / PCFICH (Physical Control Format Indicator CHannel) / PHICH ((Physical Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) are respectively DCI (Downlink Control Information) / CFI ( Control Format Indicator)/Downlink ACK/NACK (ACKnowlegement/Negative ACK)/Refers to a set of time-frequency resources or a set of resource elements carrying downlink data. Also, PUCCH (Physical Uplink Control CHannel)/PUSCH (Physical Uplink Shared CHannel)/PRACH (Physical Random Access CHannel) refers to a set of time-frequency resources or a set of resource elements that carry UCI (Uplink Control Information)/uplink data/random access signal, respectively.

Figure 1 illustrates the structure of a radio frame used in NR.

In NR, uplink and downlink transmission consists of frames. A wireless frame is 10ms long and is defined as two 5ms half-frames (HF). A half-frame is defined as five 1ms subframes (Subframe, SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on SCS (Subcarrier Spacing). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). Normally when CP is used, each slot contains 14 symbols. When extended CP is used, each slot contains 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).

Table 1 illustrates that when a normal CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

SCS(15* ^2u ) N- ^slot _symbol N ^{frame, u} _slot N ^subframe,u _slot 15 KHz (u = 0) 14 10 One 30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u =3) 14 80 8 240 KHz (u =4) 14 160 16

N ^slot _symb : Number of symbols in a slotN ^frame,u _slot : Number of slots in a frame

N ^subframe,u _slot : Number of slots in the subframe

Table 2 illustrates that when an extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

SCS (15* ^2u ) N- ^slot _symbol N ^{frame, u} _slot N ^subframe,u _slot 60KHz (u=2) 12 40 4

In the NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) may be set differently between multiple cells merged into one UE. Accordingly, the (absolute time) interval of time resources (e.g., SF, slot, or TTI) (for convenience, collectively referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between merged cells.

Figure 2 illustrates the slot structure of an NR frame.

A slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one slot contains 14 symbols, but in the case of extended CP, one slot contains 12 symbols. A carrier wave includes a plurality of subcarriers in the frequency domain. RB (Resource Block) is defined as multiple (eg, 12) consecutive subcarriers in the frequency domain. BWP (Bandwidth Part) is defined as a plurality of consecutive (P)RBs in the frequency domain and may correspond to one numerology (e.g., SCS, CP length, etc.). A carrier wave may contain up to N (e.g., 4) BWPs. Data communication is performed through an activated BWP, and only one BWP can be activated for one terminal. Each element in the resource grid is referred to as a Resource Element (RE), and one complex symbol can be mapped.

Figure 3 illustrates the structure of a self-contained slot.

In the NR system, a frame features a self-contained structure in which a DL control channel, DL or UL data, and UL control channel can all be included in one slot. For example, the first N symbols in a slot may be used to transmit a DL control channel (hereinafter, DL control area), and the last M symbols in a slot may be used to transmit a UL control channel (hereinafter, UL control area). N and M are each integers greater than or equal to 0. The resource area (hereinafter referred to as data area) between the DL control area and the UL control area may be used for DL data transmission or may be used for UL data transmission. As an example, the following configuration may be considered. Each section is listed in chronological order.

1. DL only configuration

2. UL only configuration

3. Mixed UL-DL configuration

- DL area + GP (Guard Period) + UL control area

- DL control area + GP + UL area

DL area: (i) DL data area, (ii) DL control area + DL data area

UL area: (i) UL data area, (ii) UL data area + UL control area

PDCCH may be transmitted in the DL control area, and PDSCH may be transmitted in the DL data area. PUCCH may be transmitted in the UL control area, and PUSCH may be transmitted in the UL data area. In the PDCCH, Downlink Control Information (DCI), for example, DL data scheduling information, UL data scheduling information, etc. may be transmitted. In PUCCH, Uplink Control Information (UCI), for example, Positive Acknowledgment/Negative Acknowledgment (ACK/NACK) information for DL data, Channel State Information (CSI) information, Scheduling Request (SR), etc. may be transmitted. GP provides a time gap during the process of the base station and the terminal switching from transmission mode to reception mode or from reception mode to transmission mode. Some symbols at the point of transition from DL to UL within a subframe may be set to GP.

The 5G wireless mobile communication system NR defined by 3GPP supports DSS (Dynamic Spectrum Sharing), a frequency sharing technology for coexistence with LTE. In other words, it is a method for efficiently migrating any LTE frequency band and utilizing it as an NR frequency band in the future. For NR signal transmission, the remaining resources excluding the radio resources used for LTE signal transmission in the corresponding frequency band are utilized. Defined to support DSS technology for use. For example, when transmitting PDSCH, a downlink data channel, any NR base station can set a rate match pattern for LTE CRS to transmit PDSCH through REs (Resource Elements) other than those used for LTE CRS transmission. It was defined to do so.

However, in the case of PDCCH for transmitting Downlink Control Information (DCI) such as scheduling control information, NR PDCCH transmission is defined to be restricted for symbols on which LTE CRS transmission is performed. Accordingly, NR PDCCH can be transmitted only through symbols #1 and #2 or symbol #2 depending on the number of LTE CRS antenna ports among the first three symbols of any DL slot: symbols #0, #1, and #2. Specifically, when the number of LTE CRS antenna ports is 1 or 2, NR PDCCH transmission is possible through symbol #1 and symbol #2, and when the number of LTE CRS antenna ports is 4, NR PDCCH transmission is possible only through symbol #2.

This limitation of OFDM symbols capable of NR PDCCH transmission can cause a shortage of NR PDCCH capacity, and as a solution to this, the need for technology to support NR PDCCH transmission is increasing for OFDM symbols in which LTE CRS transmission is performed. there is.

The present invention proposes a method for supporting NR PDCCH transmission in symbols where LTE CRS transmission is performed. In particular, when the radio resources allocated for NR PDCCH transmission include LTE CRS, a specific method for applying rate matching is proposed.

Point 1: LTE CRS rate matching configuration

When the base station transmits NR PDCCH and the terminal monitors and receives NR PDCCH, it is defined not to transmit or receive PDCCH payload or PDCCH DM-RS for RE(s) used for LTE CRS transmission, and the base station You can set it.

To support DSS, a random NR base station transmitted LTE CRS rate matching pattern setting information for the NR PDSCH to the terminal in the corresponding cell through RRC signaling. That is, RRC IE (Information Elements) " RateMatchPatternLTE-CRS " for transmitting LTE CRS rate matching configuration information for NR PDSCH has been defined, and the corresponding RRC IE has been defined to include the information below. Accordingly, any NR terminal is defined not to expect reception of the NR PDSCH for the RE(s) used for the corresponding LTE CRS transmission when receiving the NR PDSCH. Likewise, rate matching can be defined for NR PDCCH reception according to the corresponding " RateMatchPatternLTE-CRS ".

RateMatchPatternLTE-CRS information element

--ASN1START
-- TAG-RATEMATCHPATTERNLTE-CRS-START

RateMatchPatternLTE-CRS ::= SEQUENCE {
carrierFreqDL INTEGER (0..16383);
carrierBandwidthDL ENUMERATED {n6, n15, n25, n50, n75, n100, spare2, spare1},
mbsfn-SubframeConfigList EUTRA-MBSFN-SubframeConfigList OPTIONAL, -- Need M
nrofCRS-Ports ENUMERATED {n1, n2, n4},
v-Shift ENUMERATED {n0, n1, n2, n3, n4, n5}
}

LTE-CRS-PatternList-r16 ::= SEQUENCE (SIZE (1..maxLTE-CRS-Patterns-r16)) OF RateMatchPatternLTE-CRS

-- TAG-RATEMATCHPATTERNLTE-CRS-STOP
--ASN1STOP

RateMatchPatternLTE-CRS field descriptions carrierBandwidthDL
BW of the LTE carrier in number of PRBs (see TS 38.214 [19], clause 5.1.4.2). carrierFreqDL
Center of the LTE carrier (see TS 38.214 [19], clause 5.1.4.2). mbsfn-SubframeConfigList
LTE MBSFN subframe configuration (see TS 38.214 [19], clause 5.1.4.2). nrofCRS-Ports
Number of LTE CRS antenna port to rate-match around (see TS 38.214 [19], clause 5.1.4.2). v-Shift
Shifting value v-shift in LTE to rate match around LTE CRS (see TS 38.214 [19], clause 5.1.4.2).

At this time, as a method to apply LTE CRS rate matching to the corresponding NR PDCCH, LTE CRS rate matching to the NR PDCCH can be set in CORESET units or search space units. In other words, when configuring CORESET for an arbitrary terminal at the NR base station, it can be defined to include indication information for applying NR PDCCH rate matching according to the corresponding " RateMatchPatternLTE-CRS ". Specifically, an information area for indicating whether to apply LTE CRS rate matching according to " RateMatchPatternLTE-CRS " is defined in the RRC IE for setting CORESET for any terminal, and based on this, NR PDCCH is transmitted through the corresponding CORESET. determine whether to apply LTE CRS rate matching, or directly include carrierFreqDL, carrierBandwidthDL, mbsfn-SubframeConfigList information included in the above " RateMatchPatternLTE-CRS " in the relevant CORESET setting information, and LTE for NR PDCCH based on this CRS rate matching can be defined.

Alternatively, when configuring a search space for a random terminal at the NR base station, it can be defined to include indication information for applying NR PDCCH rate matching according to " RateMatchPatternLTE-CRS ". Specifically, in the RRC IE for setting the search space for any terminal, an information area is defined to indicate whether or not to apply CRS rate matching according to the " RateMatchPatternLTE-CRS " setting, and based on this, transmission is performed through the search space. Decide whether to apply LTE CRS rate matching to NR PDCCH, or directly include carrierFreqDL, carrierBandwidthDL, mbsfn-SubframeConfigList information included in " RateMatchPatternLTE-CRS " above in the search space setting information, and LTE CRS based on this. It can be defined so that rate matching occurs.

As another method for applying LTE CRS rate matching to the corresponding NR PDCCH, it can be defined so that whether or not LTE CRS rate matching to the corresponding NR PDCCH is determined on a per-terminal basis.

As an example of this, any UE can implicitly define whether LTE CRS rate matching for the NR PDCCH is determined according to the UE capability configuration information and the “ RateMatchPatternLTE-CRS ” configuration above. Specifically, the base station and the terminal can exchange information about whether the terminal supports LTE CRS rate matching for the NR PDCCH through UE capability configuration information. Based on this, LTE CRS rate matching support for NR PDCCH is determined in any terminal. At this time, if any terminal supports LTE CRS rate matching for the NR PDCCH, LTE CRS rate matching for the NR PDCCH is determined depending on whether the “ RateMatchPatternLTE-CRS ” setting is set. That is, in the case of a terminal for which arbitrary LTE CRS pattern information is set through reception of the above " RateMatchPatternLTE-CRS ", rate matching for LTE CRS RE(s) can be defined to be assumed when receiving NR PDCCH according to the information. . That is, if the NR PDCCH transmission for the corresponding terminal includes RE(s) where LTE CRS transmission is performed according to the above " RateMatchPatternLTE-CRS ", the corresponding NR PDCCH transmission is rate matching for the RE(s) where LTE CRS transmission is performed. It can be defined so that this can be achieved.

Or, define an additional information area to indicate whether to set rate matching for NR PDCCH in the " RateMatchPatternLTE-CRS ", so that the base station explicitly signals whether to apply LTE CRS rate matching to NR PDCCH through the information area. It can be defined. Accordingly, for any terminal that supports LTE CRS rate matching for NR PDCCH, the base station additionally includes explicit setting information about whether to apply LTE CRS rate matching to the " RateMatchPatternLTE-CRS " for the NR PDCCH for that terminal. and transmit it to the corresponding terminal. Accordingly, the terminal can be defined to decide whether to apply rate matching for LTE CRS when receiving the NR PDCCH according to the corresponding “ RateMatchPatternLTE-CRS ”.

Point 2: CCE size or AL adaptation

Option 1: Extended number of REGs per CCE

As described above, NR PDCCH transmission is supported in the symbol in which LTE CRS transmission is performed, and accordingly, when rate matching is performed for the RE(s) in which LTE CRS transmission is performed during NR PDCCH transmission, through one CCE (Control Channel Element) The number of REs used to transmit NR PDCCH payload decreases compared to the normal case.

Specifically, according to the existing NR PDCCH transmission structure, one CCE consists of 6 REGs (Resource Element Groups), and one REG consists of 1 PRB x 1 OFDM symbol, that is, 12 REs. Among these, as described above, three REs of subcarrier #1, 5, and 9 are used for DM-RS transmission, so NR PDCCH payload is transmitted for a total of 9 REs per REG. Accordingly, a total of 54 REs per CCE can be used to transmit the NR PDCCH payload.

On the other hand, when LTE CRS transmission is performed in a random symbol, and rate matching is applied to the corresponding LTE CRS transmission REs to transmit NR PDCCH, the actual NR PDCCH among the 12 REs constituting one REG in the corresponding symbol The number of REs used for payload transmission can be reduced to 7 (if the number of LTE CRS antenna ports is 1) or 5 (if the number of LTE CRS antenna ports is 2 or 4).

For example, if NR PDCCH transmission is performed through the first 2 symbols of a random slot and the number of LTE CRS antenna ports is set to 4, the number of REs available for NR PDCCH payload transmission in one NR CCE increases from the existing 54. It can be reduced to 30. (However, the exact number of REs available for transmission of the NR PDCCH payload in one CCE may vary depending on the handling method for cases in which collision between NR PDCCH DM-RS and LTE CRS transmission occurs in the same RE, The invention is not limited by that number.)

In this way, the problem of reducing the number of REs available for NR PDCCH payload transmission within one CCE affects the coding rates of the corresponding NR PDCCH transmission, which may lead to a decrease in PDCCH transmission performance.

As a way to overcome this problem of lack of available REs, CCE size adaptation can be defined according to the application of LTE CRS rate matching, that is, the number of REGs constituting one CCE can be adapted according to LTE CRS rate matching. You can define how to do it. For example, as in the above example, if the number of REs available for PDCCH payload transmission within one REG is reduced to 5, one CCE can be configured with 10 REGs.

Specifically, an extended CCE-to-REG mapping can be defined for CCE size adaptation according to the application of LTE CRS rate matching at any base station. The setting can be set through higher layer signaling, indicated through MAC CE signaling or L1 control signaling, or set implicitly. As an example of an implicit configuration method, if any CORESET or search space set for NR PDCCH transmission includes an LTE CRS transmission symbol, or additionally, among REs constituting one CCE, an RE available for PDCCH payload transmission The extended CCE mapping can be set according to conditions, such as when the number of CCEs is less than a certain threshold value. At this time, the corresponding threshold value is an arbitrary natural number, H (<50), and can be defined as a specific fixed value, set by higher layer signaling by the base station, or indicated through MAC CE signaling or L1 control signaling. The above H (e.g. H=h1, h2, h3,??) values can be defined.

Unlike the normal CCE-to-REG mapping method that configures one CCE with the existing 6 REGs, when extended CCE-to-REG mapping is set/instructed, one CCE can be configured with any N (>6) REGs. The N value is defined as a single value, so that when the extended CCE mapping is set, the CCE can be defined to be composed of the single N REGs. Alternatively, the N value may be defined as one or more values (e.g. N= n1, n2, n3, ??). In this case, the N value to be applied according to the extended CCE mapping setting is set by the base station through higher layer signaling, or Alternatively, it can be indicated through MAC CE signaling or L1 control signaling, or defined to be set implicitly. At this time, as a way to implicitly set the N value, the corresponding N value is determined by the above threshold and H value, or the duration of CORESET (number of symbols = 1, 2, or 3) and LTE within the duration It can be determined by the number of symbols that overlap with CRS transmission and the number of LTE CRS transmission antenna ports. For example, the corresponding N value in the form of table mapping according to the above parameters (threshold or CORESET duration, number of symbols overlapping with LTE CRS, number of LTE CRS transmission antenna ports, REG bundle size, etc.) or some of the parameters. This can be decided.

Option 2: support of extended AL

As another way to overcome this problem of lack of available REs, when applying rate matching to LTE CRS RE, it can be defined to support an expanded (maximum) AL (Aggregation Level). The existing NR system supported AL=1,2,4,8,16 for PDCCH link adaptation. That is, when setting the search space for any UE, it is defined to set the number of PDCCH candidates for aggregationLevel1, aggregationLevel2, aggregationLevel4, aggregationLevel8, and aggregationLevel16, respectively. However, as described above, when overlap occurs between LTE CRS and NR PDCCH transmission, the number of REs available for PDCCH payload transmission within one CCE is reduced. Therefore, in this method, as a way to solve this lack of RE, a search space that supports extended AL can be defined to be set at the base station. That is, in addition to the existing AL=1,2,4,8,16, a search space consisting of an arbitrary AL=L (>16) can be set at any NR base station. That is, when the existing NR base station sets the search space for a random terminal through RRC signaling, the number of PDCCH candidates for each AL = 1, 2, 4, 8, 16 is set as follows.

nrofCandidates SEQUENCE {
aggregationLevel1 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel2 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel4 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel8 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel16 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}
}

Therefore, in this method, a new information area is included for additionally setting the number of PDCCH candidates for extended AL=L (>16) through RRC signaling for setting the corresponding search space, and the base station uses this to provide information to any terminal. It can be defined to set the number of PDCCH candidates based on any AL=L greater than the existing maximum AL of 16. At this time, the extended AL and L values may have arbitrary fixed values, or may be set or instructed by the base station through higher layer signaling, MAC CE signaling, or L1 control signaling, or may be set implicitly. As a method of implicitly setting, the L value is determined by the threshold and H values, similar to the method of determining the N value above, or the duration of CORESET (number of symbols=1,2, or 3) and It can be determined by the number of symbols that overlap with LTE CRS transmission and the number of LTE CRS transmission antenna ports within the duration. For example, the corresponding L value in the form of table mapping according to the above parameters (threshold or CORESET duration, number of symbols overlapping with LTE CRS, number of LTE CRS transmission antenna ports, REG bundle size, etc.) or some of the parameters. This can be decided. Additionally, the corresponding L value may be set/indicated as one or more values.

Or, when interpreting the existing PDCCH candidate settings for each aggregationLevel1, aggregationLevel2, aggregationLevel4, aggregationLevel8, and aggregationLevel16, the AL=1,2,4,8,16 values corresponding to each aggregationLevel1, aggregationLevel2, aggregationLevel4, aggregationLevel8, and aggregationLevel16 are randomly selected. It can be defined to expand by value. For example, the extended AL values corresponding to aggregationLevel1, aggregationLevel2, aggregationLevel4, aggregationLevel8, and aggregationLevel16, respectively, may be defined as 2, 4, 8, 16, and 32. In this case, there is no change in the information area configuration of the existing RRC message, but the base station sets it and the terminal interprets it, which may differ from the existing terminal. To this end, whether to apply the extended AL can be defined by setting whether to apply the extended AL through RRC signaling when setting a random CORESET at the base station.

In the present invention, higher layer signaling refers to RRC signaling transmitted through PDSCH and includes UE-specific, cell-specific, or UE-group common RRC signaling. In the present invention, L1 control signaling refers to DCI (Downlink Control Information) transmitted through PDCCH and includes UE-specific DCI, UE-group common DCI, or cell-specific DCI.

The methods provided in this specification may be applied independently or may be operated in combination in any form. In addition, in the case of new terms, the terms used in this specification are arbitrary names whose meanings are easy to understand, and this specification can be applied even when other terms with the same meaning are actually used.

<General devices to which this specification can be applied>

Below, the device to which this specification can be applied will be described.

Figure 4 shows a block diagram of a processor on which the disclosure of the present specification is implemented.

As can be seen with reference to Figure 4, the processor 1020 in which the disclosure of this specification is implemented implements the proposed functions, procedures and/or methods described in this specification. Includes multiple circuits to do this: can do. For example, the processor 1020 may include a first circuit 1020-1, a second circuit 1020-2, and a third circuit 1020-3.

Additionally, although not shown, the processor 1020 may include more circuitry. Each circuit may include a plurality of transistors.

The processor 1020 may be called an application-specific integrated circuit (ASIC) or an application processor (AP), and includes at least one of a digital signal processor (DSP), a central processing unit (CPU), and a graphics processing unit (GPU). can do.

Figure 5 shows a wireless communication device according to an embodiment of the present specification.

Referring to Figure 5, the wireless communication system may include a first device 100a and a second device 100b.

The first device 100a includes a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, and a connected car ( Connected Car), Drone (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) module, robot, AR (Augmented Reality) device, VR (Virtual Reality) device, MR (Mixed Reality) device, hologram device, public safety device, MTC device, IoT device, medical device, pin. It may be a tech device (or financial device), a security device, a climate/environment device, a device related to 5G services, or a device related to the 4th industrial revolution field other than that.

The second device (100b) includes a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, and a connected car ( Connected Car), Drone (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) module, robot, AR (Augmented Reality) device, VR (Virtual Reality) device, MR (Mixed Reality) device, hologram device, public safety device, MTC device, IoT device, medical device, pin. It may be a tech device (or financial device), a security device, a climate/environment device, a device related to 5G services, or a device related to the 4th industrial revolution field other than that.

The first device 100a includes at least one processor such as the processor 1020a, at least one memory such as the memory 1010a, and the transceiver 1031a. It may include at least one transceiver. The processor 1020a may perform the above-described functions, procedures, and/or methods. The processor 1020a is capable of performing one or more protocols. For example, the processor 1020a may perform one or more layers of a wireless interface protocol. The memory 1010a is connected to the processor 1020a and can store information and/or instructions in various forms. The transceiver 1031a is connected to the processor 1020a and can be controlled to transmit and receive wireless signals.

The second device 100b includes at least one processor such as the processor 1020b, at least one memory device such as the memory 1010b, and a transceiver 1031b. It may include at least one transceiver. The processor 1020b may perform the above-described functions, procedures, and/or methods. The processor 1020b may implement one or more protocols. For example, the processor 1020b may implement one or more layers of a wireless interface protocol. The memory 1010b is connected to the processor 1020b and can store information and/or instructions in various forms. The transceiver (1031b) is connected to the processor (1020b) and can be controlled to transmit and receive wireless signals.

The memory 1010a and/or the memory 1010b may be connected respectively inside or outside the processor 1020a and/or the processor 1020b. other processors through various technologies, such as wired or wireless connections. It may be connected to.

The first device 100a and/or the second device 100b may have one or more antennas. For example, antenna 1036a and/or antenna 1036b may be configured to transmit and receive wireless signals.

Figure 6 illustrates a block diagram of a network node according to an embodiment of the present specification.

In particular, FIG. 6 is a diagram illustrating the network nodes of FIG. 6 in more detail when the base station is divided into a central unit (CU) and a distributed unit (DU).

Referring to FIG. 6, base stations W20 and W30 may be connected to the core network W10, and base station W30 may be connected to a neighboring base station W20. For example, the interface between the base stations (W20, W30) and the core network (W10) may be referred to as NG, and the interface between the base station (W30) and the neighboring base station (W20) may be referred to as Xn.

The base station (W30) can be divided into CU (W32) and DU (W34, W36). That is, the base station W30 can be operated hierarchically separated. The CU (W32) may be connected to one or more DUs (W34, W36). For example, the interface between the CU (W32) and the DUs (W34, W36) may be referred to as F1.

The CU (W32) can perform the functions of the upper layers of the base station, and the DUs (W34, W36) can perform the functions of the lower layers of the base station. For example, the CU (W32) is a logical node that hosts the radio resource control (RRC), service data adaptation protocol (SDAP), and packet data convergence protocol (PDCP) layers of a base station (e.g., gNB). may be, and the DUs (W34, W36) may be logical nodes that host the radio link control (RLC), media access control (MAC), and physical (PHY) layers of the base station. Alternatively, CU (W32) may be a logical node hosting the RRC and PDCP layers of a base station (eg, en-gNB).

The operation of DUs (W34, W36) may be partially controlled by CU (W32). One DU (W34, W36) can support one or more cells. One cell can be supported by only one DU (W34, W36). One DU (W34, W36) can be connected to one CU (W32), and by appropriate implementation, one DU (W34, W36) can be connected to multiple CUs.

Figure 7 illustrates a block diagram of a communication device according to an embodiment of the present specification.

In particular, Figure 7 is a diagram illustrating the terminal of Figure 6 in more detail.

The terminal includes a memory 1010, a processor 1020, a transceiver 1031, a power management module 1091, a battery 1092, a display 1041, an input unit 1053, a speaker 1042, and a microphone 1052, Includes a subscriber identification module (SIM) card and one or more antennas.

Processor 1020 may be configured to implement the suggested functions, procedures and/or methods described herein. Layers of the air interface protocol may be implemented in processor 1020. Processor 1020 may include an application-specific integrated circuit (ASIC), other chipset, logic circuit, and/or data processing device. The processor 1020 may be an application processor (AP). The processor 1020 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). Examples of processors 1020 include SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, A series processors manufactured by Apple®, HELIOTM series processors manufactured by MediaTek®, INTEL® It may be an ATOMTM series processor manufactured by or a corresponding next-generation processor.

The power management module 1091 manages power for the processor 1020 and/or the transceiver 1031. Battery 1092 supplies power to power management module 1091. The display 1041 outputs the results processed by the processor 1020. Input unit 1053 receives input to be used by processor 1020. The input unit 1053 may be displayed on the display 1041. A SIM card is an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and its associated keys, which are used to identify and authenticate subscribers in mobile phone devices such as mobile phones and computers. You can also store contact information on many SIM cards.

The memory 1010 is operably coupled to the processor 1020 and stores various information for operating the processor 610. Memory 1010 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. When an embodiment is implemented as software, the techniques described herein may be implemented as modules (eg, procedures, functions, etc.) that perform the functions described herein. Modules may be stored in memory 1010 and executed by processor 1020. The memory 1010 may be implemented inside the processor 1020. Alternatively, the memory 1010 may be implemented external to the processor 1020 and may be communicatively connected to the processor 1020 through various means known in the art.

The transceiver 1031 is operably coupled to the processor 1020 and transmits and/or receives wireless signals. The transceiver unit 1031 includes a transmitter and a receiver. The transceiver 1031 may include a baseband circuit for processing radio frequency signals. The transceiver controls one or more antennas to transmit and/or receive wireless signals. The processor 1020 transmits command information to the transceiver 1031 to initiate communication, for example, to transmit a wireless signal constituting voice communication data. The antenna functions to transmit and receive wireless signals. When receiving a wireless signal, the transceiver 1031 may transfer the signal and convert the signal to baseband for processing by the processor 1020. The processed signal may be converted into audible or readable information output through the speaker 1042.

The speaker 1042 outputs sound-related results processed by the processor 1020. Microphone 1052 receives sound-related input to be used by processor 1020.

The user inputs command information such as a phone number, for example, by pressing (or touching) a button on the input unit 1053 or by voice activation using the microphone 1052.

The processor 1020 receives this command information and processes it to perform appropriate functions, such as calling a phone number. Operational data can be extracted from the SIM card or memory 1010.

Additionally, the processor 1020 may display command information or driving information on the display 1041 for the user's recognition and convenience.

The examples of the present disclosure posted in the specification and drawings are merely provided as specific examples to easily explain the technical content of the present disclosure and aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In addition to the examples posted here, it is obvious to those skilled in the art that other modifications based on the technical idea of the invention can be implemented.

Claims (2)

In the terminal method of monitoring the control channel,
Receiving cell-specific reference signal (CRS) configuration information through radio resource control (RRC) signaling; and
It includes monitoring a physical downlink control channel (PDCCH) based on the received CRS configuration information,
Here, the CRS setting information is characterized in that it is based on CORESET (control resource set) information and/or search space information. According to clause 1,
A method wherein the CORESET information and/or search space information is associated with a control resource element (CCE) or an aggregation level (AL).

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