CN117501763A - Method and apparatus for transmitting and receiving radio signal in wireless communication system - Google Patents
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Abstract
A terminal according to the present disclosure receives configuration information of a Paging Early Indication (PEI) including first offset information and second offset information, monitors a first Physical Downlink Control Channel (PDCCH) for the PEI based on the configuration information of the PEI, and monitors a second PDCCH for scheduling a paging message based on a Paging Occasion (PO) associated with the PEI, wherein the first offset information may indicate an interval between a Paging Frame (PF) and a first frame including a monitoring occasion of the first PDCCH, and the second offset information may indicate an interval between a preamble monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame.
Description
Technical Field
The present disclosure relates to wireless communication systems, and more particularly, to a method and apparatus for transmitting and receiving wireless signals.
Background
In general, wireless communication systems are evolving to cover a wide range differently to provide communication services such as audio communication services, data communication services, and the like. Wireless communication is a multiple-access system capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power, etc.). For example, the multiple access system may be any one of a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, and a single carrier frequency division multiple access (SC-FDMA) system.
Disclosure of Invention
Technical problem
An object of the present disclosure is to provide a method of efficiently performing a wireless signal transmission/reception process and an apparatus thereof.
It will be appreciated by those skilled in the art that the objects achievable with the present disclosure are not limited to those specifically described above, and that the above and other objects achievable with the present disclosure will be more clearly understood from the following detailed description.
Technical proposal
In one aspect of the present disclosure, a method of receiving a signal by a User Equipment (UE) in a wireless communication system is provided herein. The method may comprise the steps of: receiving configuration information about a Paging Early Indication (PEI); monitoring a first Physical Downlink Control Channel (PDCCH) for the PEI based on configuration information about the PEI; and monitoring a second PDCCH, which schedules a paging message, based on a Paging Occasion (PO) associated with PEI detected as a monitoring result of the first PDCCH. PEI may be associated with POs of one or more Paging Frames (PFs) among the periodic PFs. The UE may monitor a first PDCCH for PEI based on first offset information and second offset information included in configuration information about PEI. The first offset information may indicate a gap between an initial PF among one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information may indicate a gap between an initial monitoring occasion among monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information may be at the frame level.
Configuration information about PEI may be sent through higher layer signaling. Higher layer signaling may be related to System Information Blocks (SIBs).
The second offset information may indicate a gap from a start of the first frame to a start of an initial monitoring occasion of the first PDCCH.
The PEI may be associated with a PO of a first PF and a PO of a second PF among the periodic PFs. The first PF and the second PF may be continuous PFs.
The multiple PFs associated with the PEI may be constrained to be contiguous with each other.
The granularity of the second offset information may be different from the granularity of the first offset information.
The granularity of the second offset information may be at the symbol level.
In another aspect of the present disclosure, there is provided herein a computer-readable recording medium having recorded thereon a program for executing the above-described signal receiving method.
In another aspect of the present disclosure, provided herein is a UE configured to perform the above signal reception method.
In another aspect of the present disclosure, provided herein is an apparatus configured to control a UE performing the above-described signal reception method.
In another aspect of the present disclosure, a method of transmitting a signal by a base station in a wireless communication system is provided herein. The method may comprise the steps of: transmitting configuration information about PEI; transmitting a first PDCCH for PEI based on configuration information about the PEI; and transmitting a second PDCCH scheduling a paging message based on a PO associated with the PEI transmitted via the first PDCCH. PEI may be associated with POs of one or more of the periodic PFs. The BS may transmit a first PDCCH for PEI based on first offset information and second offset information included in configuration information about PEI. The first offset information may indicate a gap between an initial PF among one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information may indicate a gap between an initial monitoring occasion among monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information may be at the frame level.
In another aspect of the present disclosure, provided herein is a base station configured to perform the above-described signal transmission method.
Advantageous effects
In accordance with one embodiment of the present disclosure, the same frame level offset may be applied to the POs associated with the same paging frame in determining the location of the Paging Early Indication (PEI) occasion, thereby achieving signaling overhead reduction.
Those skilled in the art will appreciate that the effects achievable with the present disclosure are not limited to those specifically described above, and that other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 illustrates physical channels used in a 3 rd generation partnership project (3 GPP) system as an exemplary wireless communication system and a general signal transmission method using the same.
Fig. 2 shows a radio frame structure.
Fig. 3 shows a resource grid of time slots.
Fig. 4 shows an exemplary mapping of physical channels in a slot.
Fig. 5 illustrates an exemplary Physical Downlink Control Channel (PDCCH) transmission and reception process.
Fig. 6 illustrates an exemplary Physical Downlink Shared Channel (PDSCH) reception and acknowledgement/negative acknowledgement (ACK/NACK) transmission process.
Fig. 7 illustrates an exemplary Physical Uplink Shared Channel (PUSCH) transmission process.
Fig. 8 illustrates a Long Term Evolution (LTE) based wake-up signal.
Fig. 9 and 10 show flowcharts of a Base Station (BS) operation and a User Equipment (UE) operation to which the method proposed in the present disclosure is applicable, respectively.
Fig. 11 is a diagram for explaining determination of Paging Frames (PFs) and Paging Occasions (POs) related to a New Radio (NR) Discontinuous Reception (DRX) operation.
Fig. 12 is a diagram for explaining a method of indicating a paging early indication frame (pei_f) and a paging early indication occasion (pei_o) according to an embodiment of the present disclosure.
Fig. 13 is a diagram for explaining a method of receiving a signal by a UE according to an embodiment of the present disclosure.
Fig. 14 is a diagram for explaining a method of transmitting a signal by a BS according to an embodiment of the present disclosure.
Fig. 15 to 18 show examples of a communication system 1 and a wireless device suitable for use in the present disclosure.
Fig. 19 illustrates an exemplary Discontinuous Reception (DRX) operation suitable for use with the present disclosure.
Detailed Description
Embodiments of the present disclosure are applicable to various wireless access technologies such as Code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), orthogonal Frequency Division Multiple Access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA may be implemented as a radio technology such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (wireless fidelity (Wi-Fi)), IEEE 802.16 (worldwide interoperability for microwave access (WiMAX)), IEEE 802.20, and evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). The 3 rd generation partnership project (3 GPP) Long Term Evolution (LTE) is part of evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (A) is an evolved version of 3GPP LTE. The 3GPP NR (New radio or New radio Access technology) is an evolved version of 3GPP LTE/LTE-A.
As more and more communication devices require greater communication capacity, enhanced mobile broadband communication relative to conventional Radio Access Technologies (RATs) is required. In addition, large-scale Machine Type Communication (MTC) capable of providing various services by connecting a plurality of devices and objects whenever and wherever is another important issue to be considered for next-generation communication. Communication system designs that consider reliability and delay sensitive services/UEs are also being discussed. Thus, the introduction of new radio access technologies that consider enhanced mobile broadband communication (emmbb), large-scale MTC, and ultra-reliable low-delay communication (URLLC) is under discussion. In embodiments of the present disclosure, this technique will be referred to as NR (new radio or new RAT) for simplicity.
For simplicity, the 3GPP NR is mainly described, but the technical concept of the present disclosure is not limited thereto.
For background art, definitions of terms, and abbreviations associated with the present disclosure, the following documents may be incorporated by reference.
3GPP LTE
-TS 36.211: physical channel and modulation
-TS 36.212: multiplexing and channel coding
-TS 36.213: physical layer procedure
-TS 36.300: general description
-TS 36.321: medium Access Control (MAC)
-TS 36.331: radio Resource Control (RRC)
3GPP NR
TS 38.211: physical channel and modulation
TS 38.212: multiplexing and channel coding
TS 38.213: physical layer process for control
TS 38.214: physical layer procedure for data
TS 38.300: NR and NG-RAN general description
TS 38.321: medium Access Control (MAC)
TS 38.331: radio Resource Control (RRC) protocol specification
TS 37.213: introducing a channel access procedure to unlicensed spectrum for NR-based access
Terms and abbreviations
-PSS: master synchronization signal
SSS: secondary synchronization signal
-CRS: cell reference signals
-CSI-RS: channel state information reference signal
-TRS: tracking reference signals
-SS: search space
-CSS: public search space
-USS: UE-specific search space
PDCCH: a physical downlink control channel; PDCCH is used to represent PDCCHs of various structures that can be used for the same purpose in the following description.
-PO: paging occasion
-MO: monitoring the timing
-BD: blind decoding
DCI: downlink control information
-WUS: a wake-up signal; WUS may be used to represent other method signals or channels (e.g., early paging indicator (PEI)) that perform similar functions.
-pei_f: PEI frame (frame for PEI monitoring)
-pei_o: PEI timing (PEI monitoring timing (PDCCH monitoring timing set))
APEI-MPO method: method for providing information corresponding to a plurality of POs by one PEI
-mx-pattern: multiplexing pattern
In a wireless communication system, a User Equipment (UE) receives information from a Base Station (BS) through a Downlink (DL) and transmits information to the BS through an Uplink (UL). The information transmitted and received by the BS and the UE includes data and various control information, and includes various physical channels according to the type/purpose of the information transmitted and received by the UE and the BS.
Fig. 1 illustrates a physical channel used in a 3GPP NR system and a general signal transmission method using the same.
When the UE is powered on again from the power-off state or enters a new cell, the UE performs an initial cell search procedure (e.g., establishes synchronization with the BS) in step S101. To this end, the UE receives a Synchronization Signal Block (SSB) from the BS. SSBs include a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). The UE establishes synchronization with the BS based on the PSS/SSS and acquires information such as cell Identification (ID). The UE may acquire broadcast information in the cell based on the PBCH. The UE may receive a DL Reference Signal (RS) in an initial cell search procedure to monitor a DL channel state.
After the initial cell search, the UE may acquire more specific system information by receiving a Physical Downlink Control Channel (PDCCH) and receiving a Physical Downlink Shared Channel (PDSCH) based on information of the PDCCH in step S102.
The UE may perform a random access procedure to access the BS in steps S103 to S106. For random access, the UE may transmit a preamble to the BS on a Physical Random Access Channel (PRACH) (S103) and receive a response message to the preamble on the PDCCH and the PDSCH corresponding to the PDCCH (S104). In case of contention-based random access, the UE may perform a contention resolution procedure by further transmitting PRACH (S105) and receiving PDCCH and PDSCH corresponding to the PDCCH (S106).
After the foregoing procedure, the UE may receive the PDCCH/PDSCH (S107) and transmit a Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH) (S108) as a general downlink/uplink signal transmission procedure. The control information transmitted from the UE to the BS is referred to as Uplink Control Information (UCI). UCI includes hybrid automatic repeat and request acknowledgement/negative acknowledgement (HARQ-ACK/NACK), scheduling Request (SR), channel State Information (CSI), and the like. CSI includes Channel Quality Indicators (CQIs), precoding Matrix Indicators (PMIs), rank Indicators (RIs), and the like. Although UCI is generally transmitted on the PUCCH, UCI may be transmitted on PUSCH when control information and traffic data need to be transmitted simultaneously. In addition, UCI may be aperiodically transmitted through PUSCH according to a request/command of the network.
Fig. 2 shows a radio frame structure. In NR, uplink and downlink transmissions are configured in frames. Each radio frame has a length of 10ms and is divided into two 5ms Half Frames (HF). Each field is divided into five 1ms Subframes (SFs). The subframe is divided into one or more slots, and the number of slots in the subframe depends on a subcarrier spacing (SCS). Each slot includes 12 or 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols according to a Cyclic Prefix (CP). When normal CP is used, each slot includes 14 OFDM symbols. When the extended CP is used, each slot includes 12 OFDM symbols.
Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when using the normal CP.
TABLE 1
| SCS(15*2 u ) | N slot symb | N frame,u slot | N subframe,u slot |
| 15KHz(u＝0) | 14 | 10 | 1 |
| 30KHz(u＝1) | 14 | 20 | 2 |
| 60KHz(u＝2) | 14 | 40 | 4 |
| 120KHz(u＝3) | 14 | 80 | 8 |
| 240KHz(u＝4) | 14 | 160 | 16 |
*N slot symb : number of symbols in a slot
*N frame,u slot : number of slots in a frame
*N subframe,u slot : number of slots in a subframe
Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when the extended CP is used.
TABLE 2
| SCS(15*2 u ) | N slot symb | N frame,u slot | N subframe,u slot |
| 60KHz(u＝2) | 12 | 40 | 4 |
The structure of the frame is only an example. The number of subframes, the number of slots, and the number of symbols in a frame may vary.
In an NR system, OFDM parameter sets (e.g., SCS) may be configured differently for a plurality of cells aggregated for one UE. Thus, the (absolute time) duration of a time resource (e.g., SF, slot or TTI) consisting of the same number of symbols, referred to as a Time Unit (TU) for simplicity, may be configured differently among aggregated cells. Here, the symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete fourier transform-spread-OFDM (DFT-s-OFDM) symbols).
Fig. 3 shows a resource grid of time slots. A slot includes a plurality of symbols in the time domain. For example, when a normal CP is used, a slot includes 14 symbols. However, when the extended CP is used, the slot includes 12 symbols. The carrier comprises a plurality of subcarriers in the frequency domain. A Resource Block (RB) is defined to a plurality of contiguous subcarriers (e.g., 12 contiguous subcarriers) in the frequency domain. A bandwidth portion (BWP) may be defined as a plurality of consecutive Physical RBs (PRBs) in the frequency domain and corresponds to a single parameter set (e.g., SCS, CP length, etc.). The carrier may include up to N (e.g., five) BWPs. Data communication may be performed through the enabled BWP, and only one BWP may be enabled for one UE. In the resource grid, each element is called a Resource Element (RE), and one complex symbol may be mapped to each RE.
Fig. 4 shows an example of mapping physical channels in a slot. In an NR system, a frame is characterized by a self-contained structure in which DL control channels, DL or UL data, and UL channels may all be included in one slot. For example, the first N symbols of a slot may be used to carry a DL channel (e.g., PDCCH) (hereinafter, referred to as DL control region), and the last M symbols of a slot may be used to carry a UL channel (e.g., PUCCH) (hereinafter, referred to as UL control region). Each of N and M is an integer equal to or greater than 0. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region may be used to transmit DL data (e.g., PDSCH) or UL data (e.g., PUSCH). The Guard Period (GP) provides a time gap for switching from a transmit mode to a receive mode or from a receive mode to a transmit mode. Some symbols at DL-to-UL switching in a subframe may be configured as GP.
The PDCCH transmits DCI. For example, the PDCCH (i.e., DCI) may carry information on a transport format and resource allocation of a DL shared channel (DL-SCH), resource allocation information of an uplink shared channel (UL-SCH), paging information on a Paging Channel (PCH), system information on the DL-SCH, information on resource allocation of a higher layer control message (e.g., RAR transmitted on PDSCH), a transmission power control command, information on activation/release of a configured schedule, and the like. The DCI includes a Cyclic Redundancy Check (CRC). The CRC is masked with various Identifiers (IDs), such as a Radio Network Temporary Identifier (RNTI), according to the owner or purpose of the PDCCH. For example, if the PDCCH is for a specific UE, the CRC is masked by a UE ID (e.g., cell-RNTI (C-RNTI)). If the PDCCH is used for the paging message, the CRC is masked by a paging-RNTI (P-RNTI). If the PDCCH is used for system information (e.g., a System Information Block (SIB)), the CRC is masked by a system information RNTI (SI-RNTI). When the PDCCH is used for RAR, the CRC is masked by a random access-RNTI (RA-RNTI).
Fig. 5 illustrates an exemplary PDCCH transmission/reception process.
Referring to fig. 5, the bs may transmit a control resource set (CORESET) configuration to the UE (S502). CORESET is defined as a set of Resource Element Groups (REGs) with a given set of parameters (e.g., subcarrier spacing (SCS), cyclic Prefix (CP) length, etc.). REG is defined as one OFDM symbol by one (physical) resource block (P) RB. Multiple CORESETs for one UE may overlap each other in the time/frequency domain. CORESET may be configured by system information (e.g., a Master Information Block (MIB)) or higher layer signaling (e.g., radio Resource Control (RRC) signaling). For example, configuration information about a particular common CORESET (e.g., CORESET # 0) may be sent in the MIB. For example, PDSCH carrying system information block 1 (SIB 1) may be scheduled by a specific PDCCH and CORESET #0 may be used to transmit the specific PDCCH. Further, configuration information regarding coreset#n (e.g., N > 0) may be transmitted through RRC signaling (e.g., cell common RRC signaling, UE-specific RRC signaling, etc.). For example, UE-specific RRC signaling carrying CORESET configuration information may include, but is not limited to, various types of signaling, such as RRC setup messages, RRC reconfiguration messages, and/or BWP configuration information. In particular, the CORESET configuration may include the following information/fields.
-control resource set id: the ID of CORESET is indicated.
-frequencydomalnresources: indicating the frequency domain resources of CORESET. The resources are indicated by a bitmap with each bit corresponding to an RB group (=6 (consecutive) RBs). For example, the Most Significant Bit (MSB) of the bitmap corresponds to the first RB group in BWP. The RB group corresponding to the bit having a bit value of 1 is allocated as a frequency domain resource of CORESET.
-duration: indicating the time domain resources of CORESET. Which indicates the number of consecutive OFDM symbols included in CORESET. The duration has a value between 1 and 3.
-cce-REG-MappingType: indicating a Control Channel Element (CCE) to REG mapping type. Both interleaving and non-interleaving types are supported.
interleaverSize: indicating the interleaver size.
-pdcch-DMRS-ScramblingID: indicating the value for PDCCH DMRS initialization. When the pdcch-DMRS-ScramblingID is not included, the physical element ID of the serving cell is used.
-a precoding granularity: indicating precoder granularity in the frequency domain.
reg-BundleSize: the REG bundle size is indicated.
tci-PresentInDCI: indicates whether a Transmission Configuration Index (TCI) field is included in the DL-related DCI.
-tci-StatesPDCCH-ToAddList: a subset of TCI states configured in the pdcch-Config to provide a quasi co-located (QCL) relationship between DL RSs and PDCCH DMRS ports in the RS set (TCI state) is indicated.
In addition, the BS may transmit a PDCCH Search Space (SS) configuration to the UE (S504). PDCCH SS configuration may be transmitted through higher layer signaling (e.g., RRC signaling). For example, RRC signaling may include, but is not limited to, various types of signaling, such as RRC setup messages, RRC reconfiguration messages, and/or BWP configuration information. Although the CORESET configuration and PDCCH SS configuration are shown as being separately signaled in fig. 5 for convenience of description, the present disclosure is not limited thereto. For example, the CORESET configuration and PDCCH SS configuration may be sent in one message (e.g., through one RRC signaling) or sent separately in different messages.
The PDCCH SS configuration may include information about the configuration of the PDCCH SS set. The PDCCH SS set may be defined as a set of PDCCH candidates monitored (e.g., blind detected) by the UE. One or more SS sets may be configured for the UE. The respective SS sets may be UE-specific search space (USS) sets or Common Search Space (CSS) sets. For convenience, the PDCCH SS set may be referred to as "SS" or "PDCCH SS".
The PDCCH SS set includes PDCCH candidates. The PDCCH candidates are CCEs that the UE monitors to receive/detect the PDCCH. Blind Decoding (BD) including PDCCH candidates is monitored. One PDCCH (candidate) includes 1, 2, 4, 8 or 16 CCEs according to an Aggregation Level (AL). One CCE includes 6 REGs. Each CORESET configuration is associated with one or more SSs, and each SS is associated with one CORESET configuration. An SS is defined based on an SS configuration, and the SS configuration may include the following information/fields.
-searchspace id: indicating the ID of the SS.
-control resource set id: indicating the CORESET associated with the SS.
Monitoringslotperiodiocityandoffset: the periodicity (in slots) and offset (in slots) of PDCCH monitoring are indicated.
Monitoringsymbols withinslot: the first OFDM symbol for PDCCH monitoring in the slot configured with PDCCH monitoring is indicated. The first OFDM symbol used for PDCCH monitoring is indicated by a bitmap with individual bits corresponding to OFDM symbols in the slot. The MSB of the bitmap corresponds to the first OFDM symbol of the slot. The OFDM symbol corresponding to the bit set to 1 corresponds to the first symbol of CORESET in the slot.
-nrofCandidates: the number of PDCCH candidates for each AL (one of the values 0, 1,2, 3, 4, 5, 6, and 8) is indicated, where al= {1,2,4,8,16}.
-searchSpaceType: indicating the DCI format used in the CSS or USS and the corresponding SS type.
Subsequently, the BS may generate and transmit the PDCCH to the UE (S506), and the UE may monitor the PDCCH candidates in one or more SSs to receive/detect the PDCCH (S508). The opportunity (e.g., time/frequency resource) at which the UE is to monitor the PDCCH candidate is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) occasions may be configured in a slot.
Table 3 shows the characteristics of the respective SSs.
TABLE 3
Table 4 shows DCI formats transmitted on PDCCH.
TABLE 4
DCI format 0_0 may be used to schedule PUSCH based on TB (or TB level), and DCI format 0_1 may be used to schedule PUSCH based on TB (or TB level) or PUSCH based on Code Block Group (CBG) (or CBG level). DCI format 1_0 may be used to schedule a TB (or TB level) -based PDSCH, and DCI format 1_1 may be used to schedule a TB (or TB level) -based PDSCH or a CBG (or CBG level) -based PDSCH (or DL grant DCI). DCI format 0_0/0_1 may be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0/1_1 may be referred to as DL grant DCI or DL scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic Slot Format Indicator (SFI)) to the UE, and DCI format 2_1 is used to transmit DL preemption information to the UE. DCI format 2_0 and/or DCI format 2_1 may be transmitted to a corresponding group of UEs on a group common PDCCH (PDCCH directed to the group of UEs).
DCI format 0_0 and DCI format 1_0 may be referred to as a fallback DCI format, and DCI format 0_1 and DCI format 1_1 may be referred to as a non-fallback DCI format. Under the fallback DCI format, the DCI size/field configuration remains the same regardless of the UE configuration. In contrast, in the non-fallback DCI format, the DCI size/field configuration varies according to the UE configuration.
The CCE-to-REG mapping type is configured to interleave one of a CCE-to-REG type and a non-interleaved CCE-to-REG type.
Non-interleaved CCE to REG mapping (or partial CCE to REG mapping) (fig. 5): the 6 REGs for a given CCE are grouped into one REG bundle, and all REGs for the given CCE are contiguous. One REG bundle corresponds to one CCE.
-interleaving CCE to REG mapping (or distributed CCE to REG mapping) (fig. 6): 2, 3, or 6 REGs for a given CCE are grouped into one REG bundle, and the REG bundles are interleaved within CORESET. In CORESET comprising one or two OFDM symbols, the REG bundle comprises 2 or 6 REGs, and in CORESET comprising three OFDM symbols, the REG bundle comprises 3 or 6 REGs. The REG beam size is set based on CORESET.
Fig. 6 illustrates an exemplary PDSCH reception and ACK/NACK transmission process. Referring to fig. 6, the ue may detect a PDCCH in slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1) and indicates DL assignment to PDSCH offset K0 and PDSCH-HARQ-ACK reporting offset K1. For example, DCI format 1_0 or DCI format 1_1 may include the following information.
-frequency domain resource assignment: indicating the set of RBs allocated to PDSCH.
-time domain resource assignment: indication K0 (e.g., slot offset), starting position of PDSCH (e.g., OFDM symbol index) in slot #n+k0, and duration of PDSCH (e.g., number of OFDM symbols).
PDSCH-to-harq_feedback timing indicator: and K1 is indicated.
HARQ process number (4 bits): HARQ process ID indicating data (e.g., PDSCH or TB).
-PUCCH Resource Indicator (PRI): PUCCH resources to be used for UCI transmission among a plurality of PUCCH resources in the PUCCH resource set are indicated.
After receiving PDSCH in slot# (n+k0) according to the scheduling information of slot #n, the UE may transmit UCI on PUCCH in slot# (n+k1). UCI may include a HARQ-ACK response to PDSCH. For convenience, fig. 5 is based on the assumption that the SCS of PDSCH is equal to that of PUCCH and slot #n1=slot# (n+k0), which should not be construed as limiting the present disclosure. When SCS is different, the SCS based on PUCCH may indicate/interpret K1.
In case the PDSCH is configured to carry at most one TB, the HARQ-ACK response may be configured in one bit. In case that the PDSCH is configured to carry at most two TBs, the HARQ-ACK response may be configured in 2 bits if spatial bundling is not configured, and in 1 bit if spatial bundling is configured. When slot # (n+k1) is designated as the HARQ-ACK transmission timing of the plurality of PDSCH, UCI transmitted in slot # (n+k1) includes HARQ-ACK responses to the plurality of PDSCH.
Whether the UE should perform spatial bundling for HARQ-ACK responses may be configured (e.g., by RRC/higher layer signaling) for each cell group. For example, spatial bundling may be configured for each individual HARQ-ACK response transmitted on PUCCH and/or HARQ-ACK response transmitted on PUSCH.
Spatial bundling may be supported when at most two (or two or more) TBs (or codewords) may be received at a time in the corresponding serving cell (or may be scheduled by one DCI) (e.g., when the higher layer parameter maxnrofcodewordsschedule bydci indicates 2 TBs). More than four layers may be used for 2TB transmission and up to four layers may be used for 1TB transmission. As a result, when spatial bundling is configured for a corresponding cell group, spatial bundling may be performed for a serving cell that may be scheduled more than four layers among the serving cells of the cell group. A UE that wants to send a HARQ-ACK response by spatial bundling may generate the HARQ-ACK response by performing a (per bit) logical and operation on the a/N bits of the multiple TBs.
For example, assuming that the UE receives DCI scheduling two TBs and receives two TBs on PDSCH based on the DCI, the UE performing spatial bundling may generate a single a/N bit through a logical and operation between a first a/N bit of a first TB and a second a/N bit of a second TB. As a result, the UE reports an ACK bit value to the BS when both the first TB and the second TB are ACKs, and reports a NACK bit value to the BS when at least one TB is a NACK.
For example, when only one TB is actually scheduled in a serving cell configured to receive two TBs, the UE may generate a single a/N bit by performing a logical and operation on the a/N bit of one TB and the bit value 1. As a result, the UE reports a/N bits of one TB to the BS.
There are multiple parallel DL HARQ processes at the BS/UE for DL transmission. Multiple parallel HARQ processes allow for continuous DL transmissions while the BS waits for HARQ feedback indicating successful or failed reception of the previous DL transmission. Each HARQ process is associated with a HARQ buffer in the Medium Access Control (MAC) layer. Each DL HARQ process manages state variables such as the number of MAC Physical Data Unit (PDU) transmissions, HARQ feedback to the MAC PDU in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.
Fig. 7 shows an exemplary PUSCH transmission procedure. Referring to fig. 7, the ue may detect a PDCCH in slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or 1_1). DCI format 1_0 or 1_1 may include the following information.
-frequency domain resource assignment: indicating the set of RBs assigned to PUSCH.
-time domain resource assignment: the slot offset K2 is indicated, as well as the starting position (e.g., OFDM symbol index) and duration (e.g., number of OFDM symbols) of the PUSCH in the slot. The start symbol and length of PUSCH may be indicated by a Start and Length Indicator Value (SLIV) or separately.
Then, the UE may transmit PUSCH in slot# (n+k2) according to the scheduling information in slot #n. The PUSCH includes the UL-SCH TB.
Paging
The network may (i) access UEs in rrc_idle, rrc_inactive, and rrc_connected states through paging messages, and (ii) indicate system information change and earthquake and tsunami warning system/commercial mobile alert system (ETWS/CMAS) notification to UEs in rrc_idle and rrc_inactive states and UEs in rrc_connected states through short messages. Both the paging message and the short message are transmitted based on the P-RNTI based PDCCH. The paging message is sent on a logical channel (paging control channel (PCCH)), while the short message is sent directly on the physical channel PDCCH. Since the logical channel PCCH is mapped to the physical channel PDSCH, the paging message can be understood as being scheduled based on the P-RNTI-based PDCCH.
While the UE remains in the rrc_idle state, the UE monitors a Core Network (CN) of a paging channel to initiate paging. In the rrc_inactive state, the UE also monitors the paging channel for Radio Access Network (RAN) initiated paging. The UE need not monitor the paging channel continuously. Paging Discontinuous Reception (DRX) is defined as monitoring a paging channel during only one Paging Occasion (PO) per DRX cycle by a UE in rrc_idle or rrc_inactive state. The paging DRX cycle is configured by the network as follows.
1) In case of CN initiated paging, a default cycle is broadcasted in the system information.
2) In case of CN initiated paging, UE specific loops are configured through NAS signaling.
3) In case of RAN initiated signaling, UE specific loops are configured through RRC signaling.
Because all POs for CN-initiated signaling and RAN-initiated signaling UEs are based on the same UE ID, the two POs overlap each other. The number of POs in the DRX cycle may be set by the system information, and the network may allocate UEs to the POs based on the ID.
When the UE is in the rrc_connected state, the UE monitors SI change indication and PWS notification of the paging channel in each PO signaled by system information. In Bandwidth Adaptation (BA), the rrc_connected UE monitors the paging channel only in the active BWP where the configured CSS is located.
In shared spectrum channel access, additional PDCCH monitoring occasions may be configured in the UE's PO for paging monitoring. However, when the UE detects a P-RNTI based PDCCH transmission in its PO, the UE need not monitor for subsequent PDCCH monitoring occasions in the PO.
To reduce power consumption, the UE may use DRX in an rrc_idle state and an rrc_inactive state. The UE monitors one PO per DRX cycle. The PO is a set of PDCCH monitoring occasions and may include a plurality of slots (e.g., subframes or OFDM symbols) in which paging DCI may be transmitted. A Paging Frame (PF) is a radio frame and may include one or more POs or the start of one or more POs.
In multi-beam operation, the UE assumes that the same paging message and the same short message are repeated in all transmission beams. The paging message is the same for both RAN initiated paging and CN initiated paging.
Upon receiving the RAN initiated page, the UE initiates an RRC connection recovery procedure. Upon receiving the CN-initiated page in the rrc_inactive state, the UE transitions to the rrc_idl state and notifies the NAS of the CN-initiated page.
The PFs and POs for paging are determined as follows:
the SFN of the PF is determined by:
(SFN+PF_offset)mod T＝(T div N)*(UE_ID mod N)
the index i_s indicating the index of the PO is determined by:
i_s＝floor(UE_ID/N)mod Ns
the following parameters can be used to calculate the PF and i_s described above.
-T: in the RRC_IDLE state, the default value is applied if the UE-specific DRX is not configured by the upper layers.
-N: total number of paging frames in T
-Ns: PO quantity of PF
Pf_offset: offset for PF determination
-UE_ID：5G-S-TMSI mod 1024
WUS (wake up signal)/PEI (paging early indication)
In LTE Rel-15 narrowband internet of things (NB-IoT) and Machine Type Communication (MTC), a wake-up signal (WUS) is introduced to save power for the UE. WUS is a signal indicating in advance whether there is an actual paging transmission in a paging SS at a specific location. When the BS wants to send a page in a PO at a particular location, the BS may send WUS at a WUS transmission location associated with the PO. The UE monitors WUS transmission locations associated with the POs at a particular location. The UE may expect to send a page in the PO when WUS for the WUS transmission location is detected, and may not expect a page in the PO when WUS for the WUS transmission location is not detected. Energy saving gain can be achieved by this operation. In LTE Rel-16 NB-IoT and MTC, the UE group WUS was introduced to increase the energy saving gain of Rel-15 WUS. By using WUS transmission locations and sequences determined based on the UE group IDs of the UEs, the UE group WUS can advantageously reduce unnecessary wake-up probabilities of the UEs.
Fig. 8 is a diagram showing WUS in an LTE system. Referring to fig. 8, WUS may be used to reduce power consumption related to paging monitoring in MTC and NB-IoT. WUS is a physical layer signal indicating whether a UE should monitor a paging signal (e.g., MPDCCH/NPDCCH scrambled with a P-RNTI) according to a cell configuration. For UEs that are not configured with eDRX (i.e., configured with DRX only), WUS may be associated with one PO (n=1). In contrast, for a UE configured with eDRX, WUS may be associated with one or more POs (N≡1). Upon detecting WUS, the UE may monitor N POs after associating with WUS. When WUS is not detected, the UE may maintain sleep mode by skipping PO monitoring until the next WUS monitoring. The UE may receive WUS configuration information from the BS and monitor WUS based on the WUS configuration information. The WUS configuration information may include, for example, a maximum WUS duration, a number of consecutive POs associated with WUS, and gap information. The maximum WUS duration may refer to the maximum time period in which WUS may be transmitted and may be expressed as a ratio of the maximum number of repetitions (e.g., rmax) in relation to the PDCCH (e.g., MPDCCH or NPDCCH). Although the UE may expect repeated WUS transmissions for a maximum WUS duration, the actual number of WUS transmissions may be less than the maximum number of WUS transmissions for the maximum WUS duration. For example, the WUS repetition number may be smaller for UEs within good coverage. The resources/opportunities within the maximum WUS duration that WUS can be transmitted are referred to as WUS resources. WUS resources may be defined as a number of consecutive OFDM symbols x a number of consecutive subcarriers. WUS resources may be defined as a number of consecutive OFDM symbols x a number of consecutive subcarriers in a subframe or slot. For example, WUS resources may be defined as 14 consecutive OFDM symbols x 12 consecutive subcarriers. Upon detecting WUS, the UE does not monitor WUS until the first PO associated with WUS. When WUS is not detected during the maximum WUS duration, the UE does not monitor for paging signals in the PO associated with WUS (or the UE remains in sleep mode).
In a communication system such as NR, it may be indicated by a Paging Early Indication (PEI) (e.g., a sequence or DCI based PEI) whether the UE should monitor the paging DCI in the PO or whether the paging DCI is provided. When the UE successfully detects PEI, the UE monitors paging DCI (and/or PDSCH carrying a corresponding paging message). When PEI is not detected, the UE may skip monitoring of paging DCI in the PO.
Reception of early paging indication
In communication systems such as LTE and NR, paging is used for the purpose of triggering RRC settings, system information modification, and/or PWS/ETWS notification. The UE monitors the PDCCH at the location of the PO configured by the BS and performs an operation indicated by the DCI when the DCI scrambled with the P-RNTI is detected.
In LTE Rel-15 NB-IoT and MTC WUS is introduced to save power for UEs. WUS is a signal indicating whether there is an actual paging transmission in a PO at a specific location. When the BS wants to send a page in a PO at a particular location, the BS may send WUS at a WUS transmission location associated with the PO. The UE monitors WUS transmission locations associated with the POs at a particular location. Upon WUS detection at the WUS transmission location, the UE may expect to send a page in the PO. When the UE fails to detect WUS at the WUS transmission location, the UE does not expect paging in the PO. This operation may result in power saving gains. In LTE Rel-16 NB-IoT and MTC, a UE group WUS is introduced to increase the power saving gain of Rel-15 WUS. An advantage of the UE group WUS is that the unnecessary wake-up probability of the UE can be reduced using WUS transmission positions and sequences determined based on the UE group ID of the UE.
In Rel-16 NR, in order to support power saving in the connected mode, a DCI-based power saving scheme is introduced. For this, a new DCI format, DCI formats 2-6, was introduced. Specifically, the BS indicates the location of bits to be monitored by the UE in DCI formats 2-6, and the UE determines power saving operation in the active duration based on information about the bits at the corresponding locations.
As discussed in Rel-16 NB-IoT and MTC, when a UE in idle/inactive mode monitors for a PO, unnecessary wakeup may occur if pages are sent to other UEs sharing the same PO. Unnecessary wakeup may result in increased UE power consumption. In the current NR, a DCI-based scheme for preventing a connected mode UE from performing unnecessary monitoring has been introduced to achieve the power saving effect as described above. However, the same (or similar) method has not been defined for idle/inactive modes. In Rel-17 NR, for UE power saving, the introduction of PEI is being discussed as a means of providing paging-related information before the PO. As the information related to paging, the following is discussed: a wake-up indication for a UE group (i.e., the entire set of ue_ids that can expect paging on a particular PO), a wake-up indication for a UE subgroup (i.e., a subgroup obtained by subdividing a particular UE group), a short message and/or idle/inactive mode UE hypothesis, and a reception indication for an intended TRS/CSI-RS.
As one way of determining the position of PEI, it may be considered that the UE monitors PEI based on an offset relative to the corresponding PO. In general, paging a UE may benefit when the offset between PEI and PO is small for the following reasons: the microsleep duration is reduced; and paging delay minimization. However, UEs other than paging UEs (non-paging UEs) may experience a reduction in power saving gain. On the other hand, when the offset between PEI and PO is large, the non-paging UE may experience higher power saving gain. However, there may be a disadvantage in that the microsleep duration and paging delay are unnecessarily increased. Therefore, it is necessary to consider a method of allowing the BS to configure the size of the offset between PEI and PO in consideration of network conditions and characteristics of UEs to be served.
When the BS is allowed to adjust the offset between PEI and PO as described above, the BS needs to adjust the offset at the slot level to achieve PEI position determination with similar scheduling flexibility as PO position determination in the current NR. To increase the power saving gain of the UE and ensure the number of SSBs that the UE needs after PEI acquisition (e.g., SSBs needed to measure the channels used to receive the paging PDCCH/PDSCH), multiple frames or larger offset sizes may be required. However, if an offset of several tens of milliseconds (ms) is configured at a slot level granularity, signaling overhead may increase. In addition, considering the case where the search space id#0 is used as one way of determining the paging search space, it is necessary to design an offset determination method so that a similar method is applied when configuring the PEI search space.
In view of these problems and the background, a method of determining PEI monitoring opportunities is presented. The proposed method provides advantages by ensuring that the slot level granularity of the offset is within a few tens of ms while also minimizing the increase of signaling overhead. In addition, the proposed method also provides advantages when the existing CORESET and search space configuration methods are employed, by minimizing the increase in signaling overhead and ensuring coexistence with legacy UEs.
Hereinafter, the present disclosure will be described focusing on the configuration of PEI transmission and reception. However, the present disclosure is not limited thereto, and is applicable to any physical channel/signal location of another physical channel/signal.
The present disclosure will be described based on a structure of transmitting and receiving PEI in DCI format/PDCCH. However, the present disclosure is not limited thereto and is applicable to sequence-based PEI. For example, although the term "PDCCH monitoring occasion" is generally used to refer to a monitoring period for transmitting and receiving PDCCH, if sequence-based PEI is used, the term "PDCCH monitoring occasion" may refer to a location for monitoring a sequence.
The present disclosure will be described in the context of an NR system, but is not limited thereto. That is, the present disclosure is applicable to various wireless communication systems. The methods described below may be implemented in combination or independently. The terms, symbols, sequences, and the like described herein may be replaced with other terms, symbols, sequences, and the like.
Fig. 9 illustrates BS operations to which the method proposed in the present disclosure is applicable.
The BS may create configuration information about PEI and transmit the configuration information (FC 101). The configuration information may include configuration information regarding PEI monitoring opportunities. For example, the configuration information may be sent through higher layer signaling (e.g., SIB or RRC signaling).
If the BS desires to send information such as a paging message or a short message to a particular UE, the BS may send PEI (FC 102) at a location where the particular UE monitors PEI (e.g., at a location defined by frame (pei_f) and slot (pei_o)) based on the configuration information provided at step FC 101.
Thereafter, when the BS has information (e.g., paging message or short message) to transmit, the BS may transmit PDCCH/PDSCH (FC 103) at the location of the PO associated with the PEI transmitted in step FC 102.
Fig. 10 illustrates UE operations to which the method proposed in the present disclosure is applicable.
The UE may receive configuration information about PEI and apply the configuration information (FC 201). In this case, the configuration information may include configuration information regarding PEI monitoring opportunities. For example, the UE may perform a procedure for obtaining a higher layer signal (e.g., SIB or RRC signaling) receiving the configuration information.
Subsequently, the UE may perform a PEI monitoring operation (FC 202) at a location where PEI is expected to be received (e.g., at a location defined by a frame (pei_f) and a slot (pei_o)) based on the configuration information received in step FC 201.
If the UE is instructed to monitor the PO by the PEI in step FC202, the UE may receive the PDCCH/PDSCH at the location of the PO associated with the received PEI (FC 203).
Before monitoring the PO per DRX cycle, the UE may monitor PEI opportunities (hereinafter referred to as pei_o) based on configuration information provided by the BS. One pei_o is a set of one or more PDCCH monitoring occasions and may be composed of multiple slots. In this case, PEIDCI may be sent on pei_o. A PEI frame (hereinafter pei_f) is composed of one radio frame and may include one or more pei_o or pei_o start points.
In a multi-beam operation scenario, the UE may assume that some information about PDCCH monitoring occasions constituting pei_o will repeat across all transmission beams. In this case, the repeated information may include the following information: UE group/subgroup indication, short message and/or TRS/CSI-RS indication. However, if the TRS/CSI-RS indication information included in the PEIDCI is a beam specific indication (e.g., an indication only for TRS/CSI-RS that allows the same QCL assumption as the corresponding PEI transmission), the corresponding information is not repeated across all transmission beams, but may be changed for each transmission beam.
Hereinafter, a method for the UE to determine pei_f and pei_o to monitor PEI will be described.
Proposal 1: configuration of frame offset between PF and PEI_F
To determine the position of pei_f, the UE may use information about the position of a Paging Frame (PF) that the UE needs to monitor and information about an Offset with respect to the corresponding PF (hereinafter referred to as offset_f). In this case, the PF may be determined according to a PF definition specified in the current NR (e.g., rel-15/16 NR). In particular, when DRX is configured, paging may be performed according to 3gpp TS 38.304.
Table 5 is an option of section 7.1 of 3gpp TS 38.304.
TABLE 5
FIG. 11 illustrates an exemplary determination of PF and PO in current NR DRX (e.g., rel-15/16NR DRX).
Referring to table 5 and fig. 11 together, assume a DRX cycle length t=32 frames, the number of PFs in the DRX cycle n=4, and pf_offset=7. Thus, T/n=8, and ue_id mod N has one of the following values: 0. 1, 2 and 3. Specifically, the PF of the UE satisfying ue_id mod n=0 is SFN 25, the PF of the UE satisfying ue_id mod n=1 is SFN 1, the PF of the UE satisfying ue_id mod n=16 is SFN 9, and the PF of the UE satisfying ue_id mod n=24 is SFN 17. Each UE determines an index (i_s) of POs that the UE needs to monitor among Ns POs included in one PF according to a formula floor (ue_id/N) mod Ns in table 5.
The UE may obtain an offset_f from the network signaling, which represents an Offset from the PF of the UE to pei_f that the UE needs to monitor. For example, the offset_f may be provided to the UE in a higher layer signal (e.g., SIB or RRC signal) transmitted by the BS, wherein the granularity of the offset_f may be at a frame level (i.e., 10 ms).
For example, referring to fig. 12, assume that the UE is configured to monitor the PO in the first PF or the second PF. In this case, PF and PO can be determined according to Table 5 above. The offset_f, which represents the Offset between pei_f and the specific PF, may be provided to the UE through higher layer signaling. Specifically, offset_f may be an Offset representing a gap from the start of a specific PF to pei_f at the frame level. When one PEI is associated with the POs of the plurality of PFs, as in proposal 3 described later, the initial PF among the plurality of PFs may be a specific PF. In the example of fig. 12, offset_f may represent a gap from the start of the first PF to pei_f at the frame level. The UE may identify a starting position of a first PF among the first PF and the second PF associated with the PEI and determine the pei_f based on the starting position of the first PF and the offset_f received through higher layer signaling. PEI_F includes a PDCCH monitoring occasion set (PEI_O) where the UE needs to receive PEI.
If the offset_f is not provided (e.g., when there is no network signaling indicating the offset_f), the UE may use a default value defined in the specification as the offset_f. For example, when the BS indicates that the value of offset_f is three frames, and when the PF of the UE is SFN n, the UE may assume pei_f is configured at the location of SFN n-3, and thus PEI monitoring is performed at the location of pei_f.
Furthermore, the position of pei_o for the UE within the pei_f may be determined by a separate method. Specifically, the proposal disclosed below may be applied to determine pei_o within the configured pei_f.
When pei_f is determined based on offset_f (frame level Offset relative to PF) as described in proposal 1, there is an advantage in that signaling overhead for indicating PEI monitoring position is minimized.
Proposal 2: determination of PDCCH monitoring occasion of PEI within PEI_F
The resources/locations within pei_f where the UE needs to perform PEI monitoring may be determined based on at least one of: (i) High-level parameters for configuring the PEI search space (below para peiss); or (ii) a higher-layer parameter (hereinafter para_first_pei) for determining an initial PEI monitoring occasion in pei_o (i.e., pei_o available to the UE (if configured)) to begin PDCCH monitoring of PEI. For example, as a parameter indicating an initial PEI monitoring occasion in pei_o set in the corresponding pei_f (e.g., pei_f based on offset_f described in proposal 1), para_first_pei may be provided to the UE through higher layer signaling. The parameter para_first_pei may indicate a gap (offset) from the beginning of pei_f to the beginning of the initial PEI monitoring occasion. The granularity of para_first_pei, which represents the gap (offset) from the beginning of pei_f to the beginning of the initial PEI monitoring occasion, may be at the symbol level. For example, para_first_pei may indicate the number of symbols between the start symbol of pei_f and the start symbol of the initial PEI monitoring occasion. For example, referring to fig. 12, assuming that the UE determines pei_f based on a start position of the first PF and offset_f received through higher layer signaling, and that pei_f includes a PDCCH monitoring occasion set (pei_o) that the UE needs to monitor to receive PEI, the UE may determine that pei_o starts at a position of para_first_pei spaced from the start position of pei_f. (i.e., the UE may determine the location of the initial PDCCH MO (monitoring occasion) of the PEI. Here, the start of pei_f may be a reference point to which para_first_pei is applied.
On the other hand, using two different granularity offsets based on the combination of offset_f of proposal 1 and para_first_pei of proposal 2 can be understood as a tradeoff between signaling overhead and scheduling flexibility. If a symbol level offset is used to indicate the gap between PEI _ F and PF, a significant number of bits is required, so the use of a symbol level offset is unsuitable in terms of signaling overhead. Therefore, it is desirable to indicate the gap between pei_f and PF as a frame level offset to minimize signaling overhead. On the other hand, if there is a limit indicating the PEI monitoring location only at the frame level, scheduling flexibility may be compromised. Thus, for scheduling flexibility, it is preferable to indicate the starting position of pei_o within pei_f with para_first_pei corresponding to the symbol level offset.
At least one of the para_pei_ss and para_first_pei may be provided to the UE through network signaling or may be determined by parameters (e.g., the pageguard space and the first pdcch-monitor ingoccidioofpo) for determining the paging search space.
If the search space ID of para_pei_ss has a value of 0 (i.e., searchspace id=0), the PDCCH monitoring occasion of PEI may be determined according to a method of determining a monitoring occasion of scheduling the PDCCH of Remaining Minimum System Information (RMSI). To determine the PDCCH monitoring occasion of RMSI, a method defined in the current NR (Rel-15/16 NR) can be used, which can be seen in 3gpp TS 38.213. When the above method is used, and when the wake-up indication information provided by one PEI is related to only one PO,
If only one PO is configured in one PF, one pei_o may be configured in only one pei_f.
If two POs are configured in one PF, two PEI_Os may be configured in one PEI_F, the first PEI_O may be configured in the first half frame and the second PEI_O may be configured in the second half frame. In this case, the order of PEI_O in PEI_F may follow the order in which the corresponding POs appear in the PF.
If the search space ID of para_pei_ss has a value other than 0 (i.e., searchspace ID +.0), pei_o may consist of a set of S consecutive PDCCH monitoring occasions, where S may be the number of actually transmitted SSBs configured by SIB 1. In addition, the kth PDCCH monitoring occasion of pei_o may be configured to be related to the kth SSB. In this case, the PDCCH monitoring occasions are numbered sequentially after assigning index 0 to the first (initial) PDCCH monitoring occasion in pei_f. The corresponding position may be configured not to overlap with the UL symbol. When the above method is used, and when the wake-up indication information provided by one PEI is related to only one PO,
if para_first_pei is configured, the starting position of the (i_s+1) th PDCCH monitoring occasion of pei_o within the PF may be configured to be related to the (i_s+1) th value of para_first_pei.
If para_first_pei is not configured, the starting position of the (i_s+1) th PDCCH monitoring occasion of pei_o within the PF may be set to the (i_s) th slot.
In this case, i_s is a parameter for representing the index of the PO within the PF, which can be determined by the method described in 3GPP TS 38.304 document (e.g., table 5).
Proposal 3: correlation between PEI and multiple POs
In order to reduce resource overhead due to PEI transmission, a method of indicating wake-up information of a plurality of POs by one PEI (hereinafter, APEI-MPO method) may be used. For example, one PEI may include information about the UE group to which wake up information of the PO should be provided. In addition, PEI may include other information in addition to information about the UE group. Hereinafter, a method of determining PEI_F and PEI_O in the APEI-MPO will be described.
Determination of PEI_F of APEI-MPO
For example, in APEI-MPO, a PO set belonging to the same PF may be associated with PEI. Specifically, if the paging search space ID is designated as 0, one or two POs may be configured in one PF according to parameters configured by the BS. In this case, one PEI may provide UE group indication information of at most two POs. In addition, if the paging search space ID is designated as a value other than 0, one, two, or four POs may be configured in one PF according to parameters configured by the BS. In this case, one PEI may provide UE group indication information of at most 4 POs. As described above, all POs associated with the same PEI may belong to the same PF, and offset_f may be equally applied to all POs.
Alternatively, in an APEI-MPO, a PO set belonging to multiple PFs may be allowed to be associated with PEI. When one PEI is associated with a PO among the PFs, the pei_f may be determined/indicated based on a specific PF (hereinafter referred to as pf_s) selected from among the PFs. For example, for two (logically) consecutive PFs (e.g., for any integer n, a pair of a first frame corresponding to PF #2n and a second frame corresponding to pf# (2n+1)), the APEI-MPO method may be applied. In this case, the PF having the smaller SFN among the two PFs may be referred to as pf_s. Pei_f may be indicated/determined by applying offset_f to pf_s. For example, referring to FIG. 12, assume that APEI-MPO is applied to two (logically) consecutive PFs (referred to as a first PF and a second PF). In other words, assume that one PEI (or one PEI_O) is associated with the PO of the first PF and the PO of the second PF. In this scenario, a first PF having a smaller SFN among the first PF and the second PF may be determined as pf_s. Thus, pei_f may be indicated/determined based on the offset_s relative to the first PF as pf_s.
Alternatively, as another method of achieving the same effect, the position of pei_f may be determined by differently applying offset_f to each PF. For example, for two consecutive PFs, the value of offset_f may be applied to the PF that precedes it in sequence, and an additional Offset of 10ms apart from the value of offset_f may be further applied to the subsequent PF, aligning the position of pei_f.
If the APEI-MPO method is allowed for PO sets belonging to multiple PFs, a particular range of constraints may be set as conditions for determining the target PF. For example, when wake up indications of POs belonging to multiple PFs are provided by one PEI, it may be defined that multiple PFs need to be within a range of Xms. In a particular scenario where wake up indications for N PFs are provided by one PEI, it may be defined that the PFs need to be within a range of the location Xms from the original PF among the target PFs. On the other hand, even when the BS is able to configure a plurality of PFs, if the set of N PFs does not satisfy the condition of Xms (i.e., if the gap between the first PF and the last PF among the N PFs exceeds the range of Xms), the BS may be configured not to indicate the value of N. In this case, the value of X may be determined based on SSB periodicity configured by the BS, or X may be set to a fixed value (e.g., 80ms or 160 ms) determined in the specification. By doing so, a constant gap between PEI_O and each PO can be maintained for multiple POs for which wake up indications are provided by the same PEI due to application of the APEI-MPO method. If these constraints are not applied, the gap between PEI_O and each PO may vary, and for a particular PO, the size of PEI_O to PO gap may increase excessively, which may result in increased power consumption by the UE to monitor the particular PO and increased paging delay.
Determination of PEI_O of APEI-MPO
Proposal 2 may be applied to determine pei_o based on pei_f.
Hereinafter, a specific method thereof will be described.
If the search space ID of para_pei_ss has a value of 0 (i.e., searchspaceid=0), the PDCCH monitoring occasion of PEI may be determined according to a conventional method of determining the PDCCH monitoring occasion of RMSI. To determine the PDCCH monitoring occasion of RMSI, a method defined in the current NR (Rel-15/16 NR) can be used, which can be seen in 3gpp TS 38.213. When the above method is used, and when the APEI-MPO method is applied such that one PEI includes wake indication information of one or more POs, it may be determined that only one pei_o is configured in one pei_f.
If the search space ID of para_pei_ss has a value other than 0 (i.e., searchspace ID +.0), pei_o may consist of a set of S consecutive PDCCH monitoring occasions, where S may be the number of actually transmitted SSBs configured by SIB 1. In addition, the kth PDCCH monitoring occasion of pei_o may be configured to be related to the kth SSB. In this case, the PDCCH monitoring occasions are numbered sequentially after assigning index 0 to the initial (first) PDCCH monitoring occasion in pei_f. The corresponding position may be configured not to overlap with the UL symbol. When the above method is used, and when the APEI-MPO method is applied, such that one PEI includes wake up indication information of one or more POs,
If para_first_pei is configured, the starting position of the PDCCH monitoring occasion of pei_o within the PF can be determined from para_first_pei.
If para_first_pei is not configured, the starting position of the PDCCH monitoring occasion of pei_o within the PF may be set to the first slot.
Whether the APEI-MPO method is applied may be individually indicated to the UE through a higher layer signal (e.g., SIB or RRC signal) transmitted by the BS. Accordingly, the BS may be allowed to determine whether to apply the APEI-MPO method in consideration of overhead conditions of the network and power saving gain of the UE.
Alternatively, the APEI-MPO method may be configured to always apply to POs located in the same PF (or two consecutive PFs) without separate indications to determine the location of pei_f and pei_o. The benefit of this configuration may be that there is no additional signaling overhead for specifying the APEI-MPO and that the UE operation for estimating the reception position of the PEI is simplified.
Proposal 4: configuration of PEI_O in SS/PBCH blocks and CORESET multiplexing Pattern 1
If the search space ID of the page is 0, the paging PDCCH monitoring occasion may be determined by a method of determining the PDCCH monitoring occasion of RMSI. In this case, the PDCCH monitoring occasion of RMSI may be determined based on a multiplexing pattern (hereinafter referred to as mx-pattern) between the SS/PBCH block and CORESET defined in 3gpp TS 38.213. If the SS/PBCH block and CORESET multiplexing pattern 1 (hereinafter referred to as mx-pattern-1) are used as mx-pattern, a pair of PDCCH monitoring occasions may be defined with respect to each SSB index at the positions of two consecutive slots. Thus, if mx-pattern-1 is used, the UE needs to perform PDCCH monitoring every PO in two consecutive slots to monitor PDCCH monitoring occasions related to a specific SSB index. This operation may not only improve scheduling flexibility of the BS by allowing the BS to determine a transmission location of the PDCCH considering a case where transmission of other signals/channels is necessary, but also enhance reliability of paging reception by allowing the UE to monitor a plurality of POs. However, since the UE needs to perform PDCCH monitoring twice per DRX cycle even if no page is transmitted, this operation may be disadvantageous in terms of power saving efficiency.
In the proposed method, information about the position of the PF and/or PO is used to determine the position of pei_f and pei_o. In addition, as described above, when the search space ID of the PEI is designated as 0, the PEI may also follow the method of determining the PDCCH monitoring occasion of RMSI. Even in this case, a method of configuring pei_f and pei_o needs to be defined. To determine the position of pei_f, the methods presented in proposal 1 and proposal 3 can be applied as in other multiplex patterns. When applying the above described mx-pattern-1 to determine the position of PO and/or when applying mx-pattern-1 to determine the position of PEI, a method for determining the position of PEI_O is proposed. Specifically, one of the following alternatives may be selected and employed.
Alt 4-1: single PDCCH monitoring occasion
As a way of determining the position of pei_o, when mx-pattern-1 is applied to determine the position of CORESET0, and when one or more of the following conditions are met, one PDCCH monitoring occasion may be configured with respect to each SSB index at the position of each pei_o.
When the paging search space ID has a value of 0,
-when the search space ID of PEI has a value of 0, and
-when the BS indicates by separate signaling that only one PDCCH monitoring occasion is configured for each SSB index.
The present disclosure is not limited to the operation in the case where the above condition is not satisfied, which means that only one PDCCH monitoring occasion may be configured with respect to each SSB index at the position of each pei_o even in the case other than the above condition.
When this approach is used, and when the PEI provides a wake-up indication of paging reception, the UE may be configured to follow the paging procedure in the current NR (Rel-15/16 NR). When mx-pattern-1 is applied to determine the location of CORESET0 and when the paging's search space ID has a value of 0, PDCCH monitoring opportunities related to the respective SSB indexes are configured in two consecutive slots at the location of the PO. In addition, the UE may monitor for pages in both slots.
Alternatively, in order to increase power saving efficiency of the UE, the PEIDCI may include information indicating PDCCH monitoring occasions for actual transmission among two slots configured on the PO in relation to the respective SSB indexes. When mx-pattern-1 is applied to determine the location of CORESET0 and when the paging's search space ID has a value of 0, PDCCH monitoring opportunities related to the respective SSB indexes are configured in two consecutive slots at the location of the PO. The location of the PDCCH monitoring occasion to be used in both slots may be indicated to the UE by PEI. In this case, the UE may obtain a power saving benefit by omitting a Blind Detection (BD) operation of an unnecessary paging PDCCH based on information provided by the PEI.
Alt 4-2: a pair of PDCCH monitoring occasions
As a way of determining the position of pei_o, PDCCH monitoring occasions related to SSB indexes at the position of the respective pei_o may be configured by the BS when mx-pattern-1 is applied to determine the position of CORESET0 and when one or more of the following conditions are met. In this case, if configured by the BS, PDCCH monitoring opportunities related to SSB indexes at the positions of the respective pei_os may be configured in two consecutive slots.
When the paging search space ID has a value of 0,
-when the search space ID of PEI has a value of 0, and
-when the BS indicates to configure PDCCH monitoring occasions related to the respective SSB indexes at the positions of two consecutive slots by separate signaling.
When using this method, and when providing PEI including a wake up indication of paging reception to a UE, the UE may be configured to follow the paging procedure in the current NR (Rel-15/16 NR). When mx-pattern-1 is applied to determine the location of CORESET0 and when the paging's search space ID has a value of 0, PDCCH monitoring opportunities related to the respective SSB indexes are configured in two consecutive slots at the location of the PO. In addition, the UE may monitor for pages in both slots.
Alternatively, in order to increase power saving efficiency of the UE, the PEIDCI may include information indicating PDCCH monitoring occasions for actual transmission among two slots configured on the PO in relation to the respective SSB indexes. Alternatively, the information on the positions of two PDCCH monitoring occasions corresponding to the respective SSB indexes configured in the PEI may specify a PDCCH monitoring occasion for actual transmission among two slots related to the respective SSB indexes configured on the PO. When mx-pattern-1 is applied to determine the location of CORESET0 and when the paging's search space ID has a value of 0, PDCCH monitoring opportunities related to the respective SSB indexes are configured in two consecutive slots at the location of the PO. The location of the PDCCH monitoring occasion to be used in both slots may be indicated to the UE by PEI. In this case, the UE may obtain a power saving benefit by omitting a Blind Detection (BD) operation of an unnecessary paging PDCCH based on information provided by the PEI.
Fig. 13 is a diagram for explaining a method of receiving a signal by a UE according to an embodiment of the present disclosure.
Referring to fig. 13, the ue may receive configuration information about PEI (a 1305).
The UE may monitor a first PDCCH for PEI based on configuration information about the PEI (a 1310).
The UE may monitor a second PDCCH of the scheduled paging message based on a PO associated with PEI detected as a result of monitoring the first PDCCH (a 1315).
PEI may be associated with POs of one or more of the periodic PFs. The UE may monitor a first PDCCH of the PEI based on the first offset information and the second offset information included in the configuration information about the PEI. The first offset information may indicate a gap between an initial PF among one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information may indicate a gap between an initial monitoring occasion among monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information may be at the frame level.
Configuration information about PEI may be received through higher layer signaling. Higher layer signaling may be related to SIBs.
The second offset information may indicate a gap from a start of the first frame to a start of an initial monitoring occasion of the first PDCCH.
The PEI may be associated with a PO of a first PF and a PO of a second PF among the periodic PFs. The first PF and the second PF may be continuous with each other.
The multiple PFs associated with the PEI may be constrained to be contiguous with each other.
The granularity of the second offset information may be different from the granularity of the first offset information.
The granularity of the second offset information may be at the symbol level.
Fig. 14 is a diagram for explaining a method of transmitting a signal by a BS according to an embodiment of the present disclosure.
Referring to fig. 14, the bs may transmit configuration information about PEI (a 1405).
The BS may transmit a first PDCCH for PEI based on configuration information about the PEI (a 1410).
The BS may send a second PDCCH scheduling a paging message based on a PO associated with PEI sent via the first PDCCH (a 1415).
PEI may be associated with POs of one or more of the periodic PFs. The BS may transmit a first PDCCH for PEI based on first offset information and second offset information included in configuration information about PEI. The first offset information may indicate a gap between an initial PF among one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH. The second offset information may indicate a gap between an initial monitoring occasion among monitoring occasions of the first PDCCH and a start of the first frame. The granularity of the first offset information may be at the frame level.
Configuration information about PEI may be sent through higher layer signaling. Higher layer signaling may be related to SIBs.
The second offset information may indicate a gap from a start of the first frame to a start of an initial monitoring occasion of the first PDCCH.
The PEI may be associated with a PO of a first PF and a PO of a second PF among the periodic PFs. The first PF and the second PF may be continuous with each other.
The multiple PFs associated with the PEI may be constrained to be contiguous with each other.
The granularity of the second offset information may be different from the granularity of the first offset information.
The granularity of the second offset information may be at the symbol level.
Fig. 15 shows a communication system 1 applied to the present disclosure.
Referring to fig. 15, a communication system 1 applied to the present disclosure includes a wireless device, a Base Station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a Radio Access Technology (RAT), such as a 5G New RAT (NR) or Long Term Evolution (LTE), and may be referred to as a communication/radio/5G device. Wireless devices may include, but are not limited to, robots 100a, vehicles 100b-1 and 100b-2, augmented reality (XR) devices 100c, handheld devices 100d, home appliances 100e, internet of things (IoT) devices 100f, and Artificial Intelligence (AI) devices/servers 400. For example, the vehicles may include vehicles having wireless communication functions, autonomously driven vehicles, and vehicles capable of performing communication between the vehicles. Herein, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). XR devices may include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, and the like. The handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS/network node with respect to other wireless devices.
The wireless devices 100a to 100f may connect to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communications (e.g., vehicle-to-vehicle (V2V)/vehicle-to-anything (V2X) communications). The IoT devices (e.g., sensors) may perform direct communications with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.
Wireless communication/connection 150a, 150b, or 150c may be established between wireless devices 100 a-100 f/BS200 or BS200/BS 200. Herein, wireless communication/connection may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, side link communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated Access Backhaul (IAB)). The wireless device and BS/wireless device may transmit/receive radio signals to/from each other through wireless communication/connections 150a and 150 b. For example, wireless communication/connections 150a and 150b may transmit/receive signals over various physical channels. To this end, at least a part of various configuration information configuring a procedure for transmitting/receiving a radio signal, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation procedures may be performed based on various proposals of the present disclosure.
Fig. 16 illustrates a wireless device suitable for use in the present disclosure.
Referring to fig. 16, the first and second wireless devices 100 and 200 may transmit radio signals through various RATs (e.g., LTE and NR). Herein, { first wireless device 100 and second wireless device 200} may correspond to { wireless device 100x and BS200} and/or { wireless device 100x and wireless device 100x } of fig. 15.
The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document. For example, the processor 102 may process the information within the memory 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver 106. The processor 102 may receive a radio signal including the second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for performing part or all of the processes controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this document. Herein, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be coupled to the processor 102 and transmit and/or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a Radio Frequency (RF) unit. In implementations of the present disclosure, a wireless device may represent a communication modem/circuit/chip.
The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document. For example, the processor 202 may process the information within the memory 204 to generate a third information/signal and then transmit a radio signal including the third information/signal through the transceiver 206. The processor 202 may receive a radio signal including the fourth information/signal through the transceiver 206 and then store information obtained by processing the fourth information/signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for performing part or all of the processes controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this document. Herein, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and/or receive radio signals through one or more antennas 208. Each transceiver 206 can include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with RF unit. In implementations of the present disclosure, a wireless device may represent a communication modem/circuit/chip.
Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more of processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, commands and/or command sets.
One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. One or more of the memories 104 and 204 may be configured by read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, a hard drive, registers, a cache memory, a computer-readable storage medium, and/or combinations thereof. The one or more memories 104 and 204 may be located internal and/or external to the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 by various techniques, such as a wired or wireless connection.
One or more transceivers 106 and 206 may transmit the user data, control information, and/or radio signals/channels mentioned in the methods and/or operational flow diagrams of this document to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels, etc., from RF band signals to baseband signals for processing received user data, control information, radio signals/channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.
Fig. 17 shows another example of a wireless device applied to the present disclosure. The wireless device may be implemented in various forms according to use cases/services (refer to fig. 15).
Referring to fig. 17, wireless devices 100 and 200 may correspond to wireless devices 100 and 200 of fig. 16 and may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of fig. 16. For example, transceiver 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of fig. 16. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless/wired interface.
The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit/battery, an input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented as, but is not limited to, a robot (100 a of fig. 15), a vehicle (100 b-1 and 100b-2 of fig. 15), an XR device (100 c of fig. 15), a handheld device (100 d of fig. 15), a home appliance (100 e of fig. 15), an IoT device (100 f of fig. 15), a digital broadcast terminal, a holographic device, a public safety device, an MTC device, a medical device, a financial technology device (or a financial device), a security device, a climate/environment device, an AI server/device (400 of fig. 15), a BS (200 of fig. 15), a network node, etc. The wireless device may be used in a mobile or stationary location depending on the use case/service.
In fig. 17, various elements, components, units/portions and/or modules in wireless devices 100 and 200 may all be connected to each other through wired interfaces, or at least a portion thereof may be connected wirelessly through communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be connected wirelessly through the communication unit 110. The various elements, components, units/portions and/or modules within wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured by Random Access Memory (RAM), dynamic RAM (DRAM), read Only Memory (ROM)), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.
Fig. 18 illustrates a vehicle or autonomous driving vehicle applied to the present disclosure. The vehicle or autonomous driving vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aircraft (AV), a ship, or the like.
Referring to fig. 18, the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130/140a through 140d correspond to blocks 110/130/140, respectively, of FIG. 17.
The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNB and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomously driven vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous driving vehicle 100 to travel on a road. The drive unit 140a may include an engine, an electric motor, a power system, wheels, brakes, steering, and the like. The power supply unit 140b may supply power to the vehicle or the autonomous driving vehicle 100, and includes a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c may acquire vehicle status, surrounding information, user information, and the like. The sensor unit 140c may include an Inertial Measurement Unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a gradient sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a depth sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, and the like. The autonomous driving unit 140d may implement a technique for maintaining a lane in which the vehicle is traveling, a technique for automatically adjusting a speed (e.g., adaptive cruise control), a technique for autonomously traveling along a determined path, a technique for traveling by automatically setting a path if a destination is set, and the like.
For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a such that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to a driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically/periodically acquire recent traffic information data from an external server and acquire surrounding traffic information data from a neighboring vehicle. In the middle of autonomous driving, the sensor unit 140c may obtain vehicle state and/or ambient information. The autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit 110 may transmit information about the vehicle location, the autonomous driving path, and/or the driving plan to an external server. The external server may predict traffic information data using AI technology or the like based on information collected from the vehicle or the autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.
Fig. 19 is a diagram illustrating a DRX operation of a UE according to an embodiment of the present disclosure.
The UE may perform DRX operations in the processes and/or methods described/suggested above. A UE configured with DRX may reduce power consumption by discontinuously receiving DL signals. DRX may be performed in an rrc_idle state, an rrc_inactive state, and an rrc_connected state. The UE performs DRX to discontinuously receive a paging signal in an rrc_idle state and an rrc_inactive state. DRX in the rrc_connected state (rrc_connected DRX) will be described below.
Referring to fig. 19, a DRX cycle includes an on duration and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the on duration. The on duration is a time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on duration. When the UE successfully detects the PDCCH during PDCCH monitoring, the UE starts an inactivity timer and remains awake. In contrast, when the UE fails to detect any PDCCH during PDCCH monitoring, the UE transitions to a sleep state after an on duration. Accordingly, when configuring DRX, PDCCH monitoring/reception may be discontinuously performed in the time domain in the procedure and/or method described/suggested above. For example, when configuring DRX, PDCCH reception opportunities (e.g., slots with PDCCH SS) may be discontinuously configured according to the DRX configuration in embodiments of the present disclosure. In contrast, when DRX is not configured, PDCCH monitoring/reception may be continuously performed in the time domain. For example, when DRX is not configured, PDCCH reception opportunities (e.g., slots with PDCCH SS) may be continuously configured in embodiments of the present disclosure. Whether DRX is configured or not, PDCCH monitoring may be limited during a time period configured as a measurement gap.
Table 6 describes DRX operation of the UE (in rrc_connected state). Referring to table 6, DRX configuration information is received through higher layer signaling (e.g., RRC signaling), and DRX on/off is controlled through a DRX command from the MAC layer. Once DRX is configured, the UE may discontinuously perform PDCCH monitoring while performing the above-described/proposed procedures and/or methods.
TABLE 6
The MAC-CellGroupConfig includes configuration information required to configure the MAC parameters for the cell group. The MAC-CellGroupConfig may also include DRX configuration information. For example, MAC-CellGroupConfig may include the following information when defining DRX.
Value of drx-onduration timer: the duration of the start period of the DRX cycle is defined.
Value of drx-inactivatetimer: the duration of a time period for which the UE wakes up after detecting a PDCCH occasion indicating a PDCCH of initial UL or DL data is defined.
-value of drx-HARQ-RTT-TimerDL: the duration of the maximum time period after receiving the DL initial transmission until receiving the DL retransmission is defined.
-value of drx-HARQ-RTT-TimerDL: a duration of a maximum time period after receiving the UL initial transmission grant until receiving the UL retransmission grant is defined.
-drx-LongCycleStartOffset: the duration and start time of the DRX cycle are defined.
-drx-ShortCycle (optional): the duration of the short DRX cycle is defined.
When any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerDL is running, the UE performs PDCCH monitoring at each PDCCH occasion, and remains in an awake state.
The above-described embodiments correspond to combinations of elements and features of the present disclosure in prescribed forms. Also, individual elements or features may be considered optional unless explicitly mentioned. Each element or feature may be implemented in a form that is not combined with other elements or features. Further, embodiments of the present disclosure can be implemented by combining elements and/or features in part. The order of operations described for various embodiments of the present disclosure may be modified. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for corresponding configurations or features of another embodiment. Also, embodiments may be configured by combining claims that do not explicitly refer to the relationship in the appended claims, or may be included as new claims by amendment after the application is filed.
Those skilled in the art will appreciate that the present disclosure may be embodied in other specific forms than those set forth herein without departing from the spirit or essential characteristics thereof. The above embodiments are therefore to be construed in all aspects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the appended claims are intended to be embraced therein.
Industrial applicability
The present disclosure is applicable to a UE, BS, or other device in a wireless mobile communication system.
Claims (15)
1. A method of receiving a signal by a user equipment, UE, in a wireless communication system, the method comprising the steps of:
receiving configuration information about paging early indication PEI;
monitoring a first physical downlink control channel, PDCCH, for the PEI based on the configuration information about the PEI; and
monitoring a second PDCCH scheduling a paging message based on a paging occasion PO associated with the PEI detected as a result of monitoring the first PDCCH,
wherein the PEI is associated with POs of one or more PFs among the periodic paging frames PF,
wherein the UE monitors the first PDCCH for the PEI based on first offset information and second offset information included in the configuration information regarding the PEI,
wherein the first offset information provides a gap between an initial PF among the one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH,
wherein the second offset information provides a gap between an initial monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame, and
Wherein the granularity of the first offset information is at a frame level.
2. The method of claim 1, wherein the configuration information regarding the PEI is received through higher layer signaling.
3. The method of claim 2, wherein the higher layer signaling relates to a system information block, SIB.
4. The method of claim 1, wherein the second offset information provides a gap from a start of the first frame to a start of the initial monitoring occasion of the first PDCCH.
5. The method of claim 1 wherein the PEI is associated with a PO of a first PF and a PO of a second PF of the periodic PFs,
wherein the first PF and the second PF are continuous PFs.
6. The method of claim 1, wherein a plurality of PFs associated with the PEI are constrained to be contiguous with each other.
7. The method of claim 1, wherein the granularity of the second offset information is different from the granularity of the first offset information.
8. The method of claim 1, wherein the granularity of the second offset information is at a symbol level.
9. A computer-readable recording medium having recorded thereon a program for executing the method according to claim 1.
10. An apparatus for wireless communication, the apparatus comprising:
a memory storing instructions; and
a processor configured to perform operations by executing the instructions,
wherein the operations of the processor include:
receiving configuration information about paging early indication PEI;
monitoring a first physical downlink control channel, PDCCH, for the PEI based on the configuration information about the PEI; and
monitoring a second PDCCH scheduling a paging message based on a paging occasion PO associated with the PEI detected as a result of monitoring the first PDCCH,
wherein the PEI is associated with POs of one or more PFs among the periodic paging frames PF,
wherein the processor is configured to monitor the first PDCCH for the PEI based on first offset information and second offset information included in the configuration information regarding the PEI,
wherein the first offset information provides a gap between an initial PF among the one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH,
wherein the second offset information provides a gap between an initial monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame, and
Wherein the granularity of the first offset information is at a frame level.
11. The apparatus of claim 10, further comprising a transceiver configured to transmit or receive wireless signals under control of the processor.
12. The apparatus of claim 10, wherein the apparatus is a user equipment, UE, operating in a wireless communication system.
13. The apparatus of claim 10, wherein the apparatus is an application specific integrated circuit, ASIC, or a digital signal processing apparatus configured to control a user equipment, UE, operating in a wireless communication system.
14. A method of transmitting a signal by a base station in a wireless communication system, the method comprising the steps of:
transmitting configuration information about paging early indication PEI;
transmitting a first physical downlink control channel, PDCCH, for the PEI based on the configuration information about the PEI; and
a second PDCCH scheduling paging messages is transmitted based on paging occasions PO associated with the PEI transmitted via the first PDCCH,
wherein the PEI is associated with POs of one or more PFs among the periodic paging frames PF,
wherein the base station transmits the first PDCCH for the PEI based on first offset information and second offset information included in the configuration information regarding the PEI,
Wherein the first offset information provides a gap between an initial PF among the one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH,
wherein the second offset information provides a gap between an initial monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame, and
wherein the granularity of the first offset information is at a frame level.
15. A base station for a wireless communication system, the base station comprising:
a memory storing instructions; and
a processor configured to perform operations by executing the instructions,
wherein the operations of the processor include:
transmitting configuration information about paging early indication PEI;
transmitting a first physical downlink control channel, PDCCH, for the PEI based on the configuration information about the PEI; and
a second PDCCH scheduling paging messages is transmitted based on paging occasions PO associated with the PEI transmitted via the first PDCCH,
wherein the PEI is associated with POs of one or more PFs among the periodic paging frames PF,
wherein the processor is configured to transmit the first PDCCH for the PEI based on first offset information and second offset information included in the configuration information regarding the PEI,
Wherein the first offset information provides a gap between an initial PF among the one or more PFs associated with the PEI and a first frame including a monitoring occasion of the first PDCCH,
wherein the second offset information provides a gap between an initial monitoring occasion among the monitoring occasions of the first PDCCH and a start of the first frame, and
wherein the granularity of the first offset information is at a frame level.
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| Application Number | Priority Date | Filing Date | Title |
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| KR10-2021-0103296 | 2021-08-05 | ||
| KR20210158254 | 2021-11-17 | ||
| KR10-2021-0158254 | 2021-11-17 | ||
| PCT/KR2022/011352 WO2023014029A1 (en) | 2021-08-05 | 2022-08-02 | Method and device for transmitting and receiving radio signal in wireless communication system |
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