WO2021070508A1 - 基地局、端末、送信方法及び受信方法 - Google Patents
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Definitions
- This disclosure relates to base stations, terminals, transmission methods and reception methods.
- NR New Radio access technology
- 5G 5th Generation mobile communication system
- 5G 5th Generation mobile communication sysmtems
- NR is a function that realizes ultra-reliable and low-latency communication (URLLC: Ultra Reliable and Low Latency Communication) in combination with high-speed and large-capacity, which are the basic requirements for advanced mobile broadband (eMBB: enhanced Mobile Broadband).
- URLLC Ultra Reliable and Low Latency Communication
- eMBB enhanced Mobile Broadband
- the non-limiting embodiment of the present disclosure contributes to the provision of a base station, a terminal, a transmission method, and a reception method capable of improving the transmission efficiency of the downlink signal in the unlicensed band.
- the terminal has a first period prior to the timing based on carrier sense and a first period based on carrier sense, based on information about at least one of the number of blind decodings for the downlink control channel signal and the number of resources for channel estimation.
- the control circuit that determines the arrangement method of the downlink control channel signal in at least one of the second period after the timing based on the carrier sense, and the downlink control channel signal are transmitted based on the determined arrangement method. It includes a transmission circuit.
- Diagram of an exemplary architecture of a 3GPP NR system Schematic showing functional separation between NG-RAN and 5GC Sequence diagram of RRC connection setup / reset procedure Use scenarios for large-capacity, high-speed communication (eMBB: enhanced Mobile BroadBand), multiple simultaneous connection machine type communication (mMTC: massive Machine Type Communications), and high-reliability, ultra-low latency communication (URLLC: Ultra Reliable and Low Latency Communications).
- eMBB enhanced Mobile BroadBand
- mMTC massive Machine Type Communications
- URLLC Ultra Reliable and Low Latency Communications
- Block diagram showing an exemplary 5G system architecture for non-roaming scenarios A diagram showing an example of the maximum blind detection (BD) number and the maximum control channel element (CCE) number.
- BD maximum blind detection
- CCE maximum control channel element
- Diagram showing an example of Phase in Downlink (DL) burst detection The figure which shows the arrangement example of CORESET and synchronization signal (SS) in a plurality of subbands.
- Diagram showing a setting example of PDCCH monitoring occupation Block diagram showing a partial configuration of a base station Block diagram showing a part of the terminal configuration Block diagram showing the configuration of a base station Block diagram showing terminal configuration Sequence diagram showing operation examples of base stations and terminals
- 5G NR system architecture and protocol stack> 3GPP is working towards the next release of fifth-generation mobile phone technology (also simply referred to as "5G"), including the development of a new wireless access technology (NR) that operates in the frequency range up to 100 GHz.
- 5G fifth-generation mobile phone technology
- NR wireless access technology
- the first edition of the 5G standard was completed at the end of 2017, which makes it possible to move on to trial production and commercial deployment of terminals (for example, smartphones) that comply with the 5G NR standard.
- the system architecture assumes NG-RAN (Next Generation-Radio Access Network) equipped with gNB as a whole.
- the gNB provides the UE-side termination of the NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocols.
- SDAP NG radio access user plane
- RRC control plane
- the gNBs are connected to each other by an Xn interface.
- gNB is converted to NGC (Next Generation Core) by the Next Generation (NG) interface, and more specifically, AMF (Access and Mobility Management Function) by the NG-C interface (for example, a specific core entity that performs AMF).
- NGC Next Generation Core
- AMF Access and Mobility Management Function
- UPF User Plane Function
- NG-U interface For example, a specific core entity that performs UPF
- the NG-RAN architecture is shown in Figure 1 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).
- the NR user plane protocol stack (see, for example, 3GPP TS 38.300, section 4.4.1) is a PDCP (Packet Data Convergence Protocol (see Section 6.4 of TS 38.300)) sublayer, which is terminated on the network side in gNB. Includes RLC (RadioLinkControl (see Section 6.3 of TS38.300)) sublayer and MAC (Medium AccessControl (see Section 6.2 of TS38.300)) sublayer.
- RLC RadioLinkControl
- MAC Medium AccessControl
- SDAP Service Data Adaptation Protocol
- control plane protocol stack is defined for NR (see, for example, TS 38.300, section 4.4.2).
- An overview of Layer 2 features is given in Section 6 of TS 38.300.
- the functions of the PDCP sublayer, RLC sublayer, and MAC sublayer are listed in Sections 6.4, 6.3, and 6.2 of TS 38.300, respectively.
- the functions of the RRC layer are listed in Section 7 of TS 38.300.
- the Medium-Access-Control layer handles multiplexing of logical channels and scheduling and scheduling-related functions including handling various numerologies.
- the physical layer is responsible for coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources.
- the physical layer also handles the mapping of transport channels to physical channels.
- the physical layer provides services to the MAC layer in the form of transport channels.
- Physical channels correspond to a set of time-frequency resources used to transmit a particular transport channel, and each transport channel is mapped to a corresponding physical channel.
- physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) as upstream physical channels, and PDSCH (Physical Downlink Shared Channel) as downlink physical channels.
- PDCCH Physical Downlink Control Channel
- PBCH Physical Broadcast Channel
- NR use cases / deployment scenarios include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communication (mMTC), which have diverse requirements in terms of data rate, latency, and coverage.
- eMBB is expected to support peak data rates (20 Gbps on downlink and 10 Gbps on uplink) and user-experienced data rates, which are about three times the data rates provided by IMT-Advanced. ..
- URLLC more stringent requirements are imposed for ultra low latency (respectively 0.5ms UL and DL for the latency of the user plane) and reliability (1-10 -5 within 1 ms).
- mMTC preferably high connection densities (1,000,000 units / km 2 equipment in urban environments), wide coverage in adverse environments, and extremely long-life batteries for low-cost equipment (15 years). Can be required.
- OFDM numerology suitable for one use case for example, subcarrier interval, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval
- CP cyclic prefix
- a low latency service preferably requires a shorter symbol length (and therefore a larger subcarrier interval) and / or a smaller number of symbols per scheduling interval (also referred to as TTI) than the mMTC service. Can be done.
- TTI also referred to as TTI
- the subcarrier spacing may be contextually optimized to maintain similar CP overhead.
- the value of the subcarrier interval supported by NR may be one or more.
- resource element can be used to mean the smallest resource unit consisting of one subcarrier for the length of one OFDM / SC-FDMA symbol.
- resource grids of subcarriers and OFDM symbols are defined for each of the uplink and downlink.
- Each element of the resource grid is called a resource element and is identified based on the frequency index in the frequency domain and the symbol position in the time domain (see 3GPP TS 38.211 v15.6.0).
- FIG. 2 shows the functional separation between NG-RAN and 5GC.
- the logical node of NG-RAN is gNB or ng-eNB.
- the 5GC has logical nodes AMF, UPF, and SMF.
- gNB and ng-eNB host the following main functions: -Radio Bearer Control, Radio Admission Control, Connection Mobility Control, Dynamic allocation of resources to UEs on both uplink and downlink (scheduling), etc. Radio Resource Management function; -Data IP header compression, encryption, and integrity protection; -Selection of AMF when attaching the UE when the routing to AMF cannot be determined from the information provided by the UE; -Routing user plane data towards UPF; -Routing control plane information towards AMF; -Setting up and disconnecting; -Scheduling and sending paging messages; -Scheduling and transmission of system notification information (sourced from AMF or Operation, Admission, Maintenance); -Measurement and measurement reporting settings for mobility and scheduling; -Transport level packet marking on the uplink; -Session management; -Network slicing support; -Management of QoS flows and mapping to data radio bearers; -Support for UEs in the RRC_INA
- the Access and Mobility Management Function hosts the following key functions: -Ability to terminate Non-Access Stratum (NAS) signaling; -NAS signaling security; -Access Stratum (AS) security control; -Core Network (CN) node-to-node signaling for mobility between 3GPP access networks; -Reachability to UE in idle mode (including control and execution of paging retransmission); -Registration area management; -Support for in-system mobility and inter-system mobility; -Access authentication; -Access authorization including roaming permission check; -Mobility management control (subscription and policy); -Network slicing support; -Select Session Management Function (SMF).
- NAS Non-Access Stratum
- AS Access Stratum
- CN Core Network
- the User Plane Function hosts the following key functions: -Anchor point for intra-RAT mobility / inter-RAT mobility (if applicable); -External PDU (Protocol Data Unit) session point for interconnection with data networks; -Packet routing and forwarding; -Policy rule enforcement for packet inspection and user plane parts; -Traffic usage report; -Uplink classifier to support the routing of traffic flows to the data network; -Branching Point to support multi-homed PDU sessions; -Quos processing for the user plane (eg, packet filtering, gating, UL / DL rate enforcement); -Verification of uplink traffic (mapping of SDF to QoS flow); -Downlink packet buffering and downlink data notification trigger function.
- -Anchor point for intra-RAT mobility / inter-RAT mobility if applicable
- -External PDU Protocol Data Unit
- Policy rule enforcement for packet inspection and user plane parts
- -Traffic usage report -Uplink classifier to support the routing
- Session Management Function hosts the following key functions: -Session management; -Assignment and management of IP addresses for UEs; -UPF selection and control; -Traffic steering setting function in the User Plane Function (UPF) for routing traffic to the appropriate destination; -Control policy enforcement and QoS; -Notification of downlink data.
- FIG. 3 shows some of the NAS portion of the interaction between the UE, gNB, and AMF (5GC entity) as the UE transitions from RRC_IDLE to RRC_CONNECTED (see TS 38.300 v15.6.0).
- RRC is a higher layer signaling (protocol) used to configure UEs and gNBs.
- AMF prepares UE context data (which includes, for example, PDU session context, security key, UE RadioCapability, UESecurityCapabilities, etc.) and provides the initial context.
- UE context data which includes, for example, PDU session context, security key, UE RadioCapability, UESecurityCapabilities, etc.
- the gNB then activates AS security along with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE and the UE responding to the gNB with a SecurityModeComplete message.
- the gNB sends an RRC Reconfiguration message to the UE, and the gNB receives the RRC Reconfiguration Complete from the UE in response to the RRC Reconfiguration message, thereby performing reconfiguration for setting up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB). ..
- SRB2 Signaling Radio Bearer 2
- DRB Data Radio Bearer
- the steps for RRC Reconfiguration are omitted because SRB2 and DRB are not set up.
- gNB notifies AMF that the setup procedure is completed by the initial context setup response (INITIALCONTEXTSETUPRESPONSE).
- the control circuit that establishes the Next Generation (NG) connection with the gNodeB during operation and the signaling radio bearer between the gNodeB and the user equipment (UE: User Equipment) are set up so as to be NG during operation.
- a 5th Generation Core (5GC) entity eg, AMF, SMF, etc.
- RRC RadioResourceControl
- IE Information Element
- FIG. 4 shows some of the use cases for 5G NR.
- the 3rd generation partnership project new radio (3GPP NR) is considering three use cases envisioned by IMT-2020 to support a wide variety of services and applications.
- the first-stage specifications for high-capacity, high-speed communication (eMBB: enhanced mobile-broadband) have been completed.
- eMBB enhanced mobile-broadband
- URLLC ultra-reliable and low-latency communications
- mMTTC multiple simultaneous connection machine type communications Standardization for massive machine-type communications is included.
- Figure 4 shows some examples of conceptual use scenarios for IMT since 2020 (see, eg, ITU-RM.2083 Figure 2).
- URLLC use cases have strict performance requirements such as throughput, latency, and availability.
- the URLLC use case is envisioned as one of the elemental technologies to realize these future applications such as wireless control of industrial production process or manufacturing process, telemedicine surgery, automation of power transmission and distribution in smart grid, traffic safety, etc. ing.
- the ultra-reliability of URLLC is supported by identifying technologies that meet the requirements set by TR 38.913.
- the NR URLLC in Release 15 includes that the target user plane latency is 0.5 ms for UL (uplink) and 0.5 ms for DL (downlink) as an important requirement.
- the general requirement of URLLC for one packet transmission is that when the latency of the user plane is 1 ms, the block error rate (BLER: block error rate) is 1E-5 for a packet size of 32 bytes.
- BLER block error rate
- the technological enhancement aimed at by NR URLLC aims to improve latency and reliability.
- Technology enhancements to improve latency include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplinks, slot-level iterations in data channels, And includes pre-emption on the downlink. Preemption means that a transmission that has already been allocated a resource is stopped and the already allocated resource is used for other transmissions of later requested lower latency / higher priority requirements. Therefore, a transmission that has already been permitted will be replaced by a later transmission. Preemption is applicable regardless of the specific service type. For example, the transmission of service type A (URLLC) may be replaced by the transmission of service type B (eMBB, etc.).
- Technology enhancements for reliability improvement include a dedicated CQI / MCS table for the 1E-5 goal BLER.
- a feature of the mMTC (massive machine type communication) use case is that the number of connecting devices that transmit a relatively small amount of data, which is typically less susceptible to delays, is extremely large.
- the device is required to be inexpensive and have a very long battery life. From an NR point of view, utilizing a very narrow bandwidth portion is one solution that saves power from the perspective of the UE and allows for longer battery life.
- Strict requirements are high reliability (reliability up to 10-6 levels), high availability, packet size up to 256 bytes, time synchronization up to a few microseconds (values depending on use case). It can be 1 ⁇ s or several ⁇ s depending on the frequency range and short latencies of about 0.5 ms to 1 ms (eg, 0.5 ms latency in the target user plane).
- NR URLLC there may be some technical enhancements from the viewpoint of the physical layer.
- These technological enhancements include enhancement of PDCCH (Physical Downlink Control Channel) for compact DCI, repetition of PDCCH, and increase of PDCCH monitoring.
- the enhancement of UCI is related to the enhancement of enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback.
- PUSCH enhancements related to minislot level hopping and retransmission / repetition enhancements.
- mini slot refers to a Transmission Time Interval (TTI) that contains fewer symbols than a slot (a slot comprises 14 symbols).
- TTI Transmission Time Interval
- QoS Quality of Service
- GRR Guaranteed Bit Rate QoS flow
- QoS flow is the finest granularity of QoS classification in a PDU session.
- the quality of service ID (QFI) is identified in the PDU session by the quality of service ID (QFI) carried in the encapsulation header via the NG-U interface.
- 5GC For each UE, 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes at least one Data Radio Bearers (DRB) for the PDU session, eg, as shown above with reference to FIG. Also, an additional DRB for the QoS flow of the PDU session can be set later (when to set it depends on NG-RAN).
- NG-RAN maps packets belonging to different PDU sessions to different DRBs.
- the NAS level packet filter in UE and 5GC associates UL and DL packets with QoS flow, while the AS level mapping rule in UE and NG-RAN associates UL and QoS flow with DL QoS flow and DRB.
- Figure 5 shows a non-roaming reference architecture of 5G NR (see TS 23.501 v16.1.0, section 4.23).
- the Application Function (AF) (for example, the external application server that hosts the 5G service illustrated in FIG. 4) interacts with the 3GPP core network to provide the service. For example, accessing a Network Exposure Function (NEF) to support applications that affect traffic routing, or interacting with a policy framework for policy control (eg, QoS control) (Policy Control Function). (Refer to PCF)).
- NEF Network Exposure Function
- Policy Control Function Policy Control Function
- the Application Function which is considered to be trusted by the operator, can interact directly with the associated Network Function.
- Application Functions that are not allowed to access Network Functions directly by the operator interact with related Network Functions using the release framework to the outside via NEF.
- FIG. 5 shows a further functional unit of the 5G architecture, namely Network Slice Selection Function (NSSF), Network Repository Function (NRF), Unified Data Management (UDM), Authentication Server Function (AUSF), Access and Mobility Management Function (AMF). , Session Management Function (SMF), and Data Network (DN, eg, service by operator, Internet access, or service by a third party). All or part of the core network functions and application services may be deployed and operated in a cloud computing environment.
- NSSF Network Slice Selection Function
- NRF Network Repository Function
- UDM Unified Data Management
- AUSF Authentication Server Function
- AMF Access and Mobility Management Function
- SMF Session Management Function
- DN Data Network
- a QoS requirement for at least one of the URLLC service, the eMMB service, and the mMTC service is set in operation.
- a transmitter that transmits the including request to at least one of the 5GC functions eg, NEF, AMF, SMF, PCF, UPF, etc.
- An application server eg, AF with a 5G architecture
- the terminal also called user equipment (UE)
- UE user equipment
- PDCCH Physical Downlink Control Channel
- the number and the number of control channel element (CCE) that can be estimated in PDCCH are defined.
- the number of PDCCHs that can be blindly decoded in one slot is also referred to as, for example, the "maximum number of blind decodings" or the “maximum number of BDs”.
- the number of CCEs that can be estimated on the channel in PDCCH is also called the "maximum number of CCEs".
- the base station also referred to as gNB, for example
- NR-Unlicensed which communicates based on the NR wireless access method, is being considered in the unlicensed frequency band (also called the license-free band).
- each device performs a carrier sense (also referred to as Listen Before Talk (LBT)) to confirm whether or not another system or terminal is using a wireless channel before transmission.
- LBT Listen Before Talk
- NR-U for example, whether or not transmission is possible is determined according to the result of LBT, so a procedure for detecting the start of transmission of a series of downlink data (for example, downlink burst (DL burst)) at the terminal is examined.
- DL burst downlink burst
- Release 16NR is considering the detection of DL burst based on PDCCH.
- Maximum number of BDs and maximum number of CCEs For example, the maximum number of BDs and the maximum number of CCEs at the time of non-carrier aggregation (CC) can be defined as shown in FIG. 6 (see, for example, Non-Patent Document 3).
- the maximum number of BDs and the maximum number of CCEs shown in FIG. 6 show values for each terminal and each slot, for example.
- a PDCCH candidate that exceeds the maximum number of BDs or the maximum number of CCEs (in other words, the upper limit) shown in FIG. 6 can be set in the terminal.
- one of the methods to set the actual PDCCH definition to the maximum number of BDs or the maximum number of CCEs shown in FIG. 6 is the "dropping rule" (in other words, the rule for not assigning the PDCCH definition and the PDCCH monitoring occupation). Is defined.
- PDCCH candidate indicates a candidate for the terminal to receive PDCCH.
- the PDCCH monitoring occurrence indicates the frequency and time resources of the PDCCH candidate.
- the dropping rule for example, the following rules may be applied.
- -PDCCH candidates and PDCCH monitoring occasions in the common search space (CSS) are not dropped.
- USS UE-specific search space
- the search space identification number for example, search space ID (SS ID)
- SS ID search space ID
- Is dropped in descending order in other words, resources are not allocated.
- the dropping rule does not apply to secondary cells. In other words, the dropping rule applies to the primary cell.
- FIG. 7 shows an example of the three phases.
- Phase A Before DL burst detection
- Phase B After DL burst detection and slot (slot # 0 in Fig. 7) Before reaching the boundary (partial slot)
- Phase C After DL burst is detected and after reaching the boundary (slot # 0 in Fig. 7) (full slot)
- GC-PDCCH Group common PDCCH
- the base station transmits GC-PDCCH at the beginning of DL burst, and the terminal detects GC-PDCCH in the set PDCCH monitoring occurrence.
- the terminal succeeds in detecting GC-PDCCH, it recognizes the transmission of DL burst (in other words, detects DL burst).
- the GC-PDCCH contains information such as an LBT subband (also called an LBT bandwidth) that can be used by a base station, or a slot format in a channeloccupancy time (COT).
- LBT subband also called an LBT bandwidth
- COT channeloccupancy time
- CORESET and Search space In Release 15 NR, for example, the number of control resource set (CORESET) or search space (SS), which is an area in which a downlink control channel can be assigned to a terminal, has the following provisions.
- CORESET 3 pieces (every bandwidth part (BWP))
- SS 10 (for each BWP)
- the bandwidth of BWP is 80 MHz
- the bandwidth of the band (for example, called LBT subband) in which the terminal (or base station) performs carrier sense (for example, LBT) is 20 MHz.
- LBT subband the bandwidth of the band in which the terminal (or base station) performs carrier sense
- LBT carrier sense
- the number of CORESETs set in the terminal will be four. It exceeds the number specified above (3).
- FIG. 8 shows an example in which the same CORESET and SS are arranged in each of a plurality of (for example, 4) LBT subbands.
- NR-U will not increase the maximum number of BDs and maximum number of CCEs specified in Release 15 NR in order to reduce the complexity of UE implementation.
- SS can be set for each of a plurality of LBT subbands.
- the efficiency of PDCCH candidate placement may be reduced by setting SS for each of multiple LBT subbands.
- FIG. 9 shows a setting example of PDCCH monitoring occupation.
- the maximum number of BDs set in the terminal is 44 times.
- the maximum number of BDs is considered and the maximum number of CCEs is not considered.
- the expression “considering " may be replaced with “based on ! or “using ", and the expression “not considering ! is used. It may be replaced with “not based on ! or “does not use !.
- four LBT subbands (for example, LBT subbands # 0 to # 3) will be described as an example, but the number of LBT subbands is not limited to four and may be another number.
- subband # 0 to # 2 fails, and subband # 3 can be used.
- subbands # 0 to # 3 can be used.
- the number of BDs in the PDCCH monitoring occurrence (for example, SS # 1 of subband # 3) effective in the terminal is 11 times.
- the number of BDs (11 times) set in the terminal is equal to or less than the maximum number of BDs (for example, 44 times). Therefore, in FIG. 9A, depending on the SS setting, it is possible to arrange another SS different from SS # 1 in subband # 3, for example, to transmit / receive PDCCH to the terminal.
- the number of BDs in the PDCCH monitoring occurrence (for example, SS # 1 of each of subband # 0 to # 3) effective in the terminal is 44 times.
- the number of BDs (44 times) set in the terminal has reached the maximum number of BDs (for example, 44 times). Therefore, in FIG. 9B, another SS different from SS # 1 cannot be further arranged on the terminal.
- PDCCHs of different types or uses are associated with each SS, and by using SS properly according to the use, the efficiency of PDCCH transmission / reception is improved.
- a plurality of SSs cannot be arranged in each LBT subband, and the efficiency of PDCCH arrangement may not be improved.
- a communication system includes, for example, a base station 100 (eg, gNB) shown in FIGS. 10 and 12, and a terminal 200 (eg, UE) shown in FIGS. 11 and 13.
- a base station 100 eg, gNB
- a terminal 200 eg, UE
- FIG. 10 is a block diagram showing a partial configuration example of the base station 100 according to one aspect of the present disclosure.
- the scheduling unit 104 has a carrier sense (for example, the number of CCEs) based on information about at least one of the number of BDs for the downlink control channel signal and the number of resources (for example, the number of CCEs) for channel estimation.
- the first period for example, Phase A
- the timing based on (LBT) in other words, the DL burst detection timing in the terminal 200
- the second period for example, Phase B or Phase
- the transmission unit 108 transmits a downlink control channel signal based on the determined arrangement method.
- FIG. 11 is a block diagram showing a partial configuration example of the terminal 200 according to one aspect of the present disclosure.
- the reception control unit 205 receives a downlink burst (DL) based on information regarding at least one of the maximum number of BDs for the downlink control channel signal and the number of resources (for example, the number of CCEs) for channel estimation.
- the receiving unit 201 receives the downlink control channel signal at the determined reception opportunity.
- FIG. 12 is a block diagram showing a configuration example of the base station 100 according to one aspect of the present disclosure.
- the base station 100 includes a receiving unit 101, a demodulation / decoding unit 102, a channel state estimation unit 103, a scheduling unit 104, a control information holding unit 105, a data / control information generating unit 106, and a reference numeral. It has a conversion / modulation unit 107 and a transmission unit 108.
- the receiving unit 101 receives the signal transmitted from the terminal 200 via the antenna, performs reception processing such as down-conversion or A / D conversion on the received signal, and demodulates / decodes the received signal after the reception processing. Output to unit 102 and channel state estimation unit 103.
- the demodulation / decoding unit 102 demodulates and decodes the received signal input from the receiving unit 101, and outputs the decoding result to the scheduling unit 104.
- the channel state estimation unit 103 estimates the channel state (in other words, carrier sense or LBT) based on the received signal input from the reception unit 101. For example, the channel state estimation unit 103 may determine whether the channel state is busy or idle. The channel state estimation unit 103 outputs information indicating the determined channel state to the scheduling unit 104.
- the channel state estimation unit 103 estimates the channel state (in other words, carrier sense or LBT) based on the received signal input from the reception unit 101. For example, the channel state estimation unit 103 may determine whether the channel state is busy or idle.
- the channel state estimation unit 103 outputs information indicating the determined channel state to the scheduling unit 104.
- the scheduling unit 104 generates, for example, information related to the PDCCH setting for the terminal 200 (hereinafter referred to as PDCCH setting information) and outputs the information to the control information holding unit 105. Further, the scheduling unit 104 outputs signaling information including PDCCH setting information to the data / control information generation unit 106.
- the scheduling unit 104 schedules (for example, assigns) PDCCH to each terminal 200, for example. For example, the scheduling unit 104 determines the PDCCH in each terminal 200 in each phase of DL burst (for example, phases A, B, and C shown in FIG. 7) based on the information indicating the channel state input from the channel state estimation unit 103. The monitoring occurrence may be determined (in other words, determined), and the PDCCH may be scheduled for the terminal 200 based on the determination result. The scheduling unit 104 instructs the data / control information generation unit 106 to generate data or control information based on the scheduling result. Further, the scheduling unit 104 outputs scheduling information including the scheduling result to the coding / modulation unit 107.
- the scheduling unit 104 determines the PDCCH in each terminal 200 in each phase of DL burst (for example, phases A, B, and C shown in FIG. 7) based on the information indicating the channel state input from the channel state estimation unit 103. The monitoring occurrence may be determined (in other words,
- the scheduling unit 104 may instruct the data / control information generation unit 106 to generate data or control information based on the decoding result input from the demodulation / decoding unit 102, for example.
- the PDCCH setting information may include setting information such as CORESET setting or SS setting.
- the control information holding unit 105 holds, for example, control information (including, for example, PDCCH setting information) input from the scheduling unit 104.
- the control information holding unit 105 may output the held information to each component of the base station 100 (for example, the scheduling unit 104) as needed.
- the data / control information generation unit 106 generates data or control information according to an instruction from the scheduling unit 104, and outputs a signal including the generated data or control information to the coding / modulation unit 107.
- the control information may include, for example, signaling information input from the scheduling unit 104.
- the coding / modulation unit 107 encodes and modulates the signal input from the data / control information generation unit 106 based on the scheduling information input from the scheduling unit 104, for example, and the modulated signal (symbol sequence). Is output to the transmission unit 108.
- the transmission unit 108 performs transmission processing such as D / A conversion, up-conversion, or amplification on the signal input from the coding / modulation unit 107, and transmits the radio signal obtained by the transmission processing from the antenna to the terminal 200. To do.
- FIG. 13 is a block diagram showing a configuration example of the terminal 200 according to one aspect of the present disclosure.
- the terminal 200 includes a reception unit 201, a demodulation / decoding unit 202, a DL transmission detection unit 203, a control information holding unit 204, a reception control unit 205, a transmission control unit 206, and a data generation unit 207. , A coding / modulation unit 208, and a transmission unit 209.
- the receiving unit 201 performs reception processing such as down-conversion or A / D conversion on the received signal received via the antenna, and outputs the received signal to the demodulation / decoding unit 202.
- the demodulation / decoding unit 202 demodulates and decodes the data or control information included in the received signal input from the receiving unit 201, and outputs the decoding result to the transmission control unit 206. Further, for example, the demodulation / decoding unit 202 outputs the signaling information included in the decoding result to the control information holding unit 204.
- the demodulation / decoding unit 202 demodulates and decodes the PDCCH included in the received signal based on the information input from the reception control unit 205, and outputs the decoding result of the PDCCH to the DL transmission detection unit 203. ..
- the DL transmission detection unit 203 detects the DL burst based on the decoding result of the PDCCH input from the demodulation / decoding unit 202.
- the DL transmission detection unit 203 outputs DL burst information indicating the detection result of DL burst to the reception control unit 205.
- the DL burst information may include, for example, LBT information indicating resources (for example, LBT subband) available to the terminal 200, or information such as channeloccupancy time (COT) length.
- the control information holding unit 204 holds signaling information (for example, PDCCH setting information) input from the demodulation / decoding unit 202, and holds the held information in each component (for example, reception control unit 205 or) as needed. Output to transmission control unit 206).
- signaling information for example, PDCCH setting information
- the reception control unit 205 determines the PDCCH monitoring occurrence based on the DL burst information input from the DL transmission detection unit 203 and the PDCCH setting information input from the control information holding unit 204.
- the reception control unit 205 outputs the PDCCH monitoring occurrence information indicating the determination result to the demodulation / decoding unit 202.
- the transmission control unit 206 instructs the data generation unit 207 to generate data based on the decoding result input from the demodulation / decoding unit 202 and the information input from the control information holding unit 204.
- the data generation unit 207 generates transmission data (for example, PUSCH) based on the data generation instruction input from the transmission control unit 206, and outputs the transmission data (for example, PUSCH) to the coding / modulation unit 208.
- transmission data for example, PUSCH
- the coding / modulation unit 208 encodes and modulates the transmission data input from the data generation unit 207, and outputs the modulated signal to the transmission unit 209.
- the transmission unit 209 performs transmission processing such as D / A conversion, up-conversion, or amplification on the signal input from the coding / modulation unit 208, and transmits the radio signal obtained by the transmission processing from the antenna to the base station 100. Send.
- FIG. 14 is a sequence diagram showing an operation example of the base station 100 and the terminal 200.
- the base station 100 performs, for example, channel state estimation (for example, carrier sense or LBT) (ST101).
- channel state estimation for example, carrier sense or LBT
- the base station 100 sets the PDCCH monitoring occurrence for the terminal 200 (ST102). For example, the base station 100 is based on the result of channel state estimation (for example, busy state or idle state), information on the LBT subband set in the terminal 200, or the number of BDs or CCEs set in the terminal 200. Then, the PDCCH monitoring occurrence of the terminal 200 may be set.
- channel state estimation for example, busy state or idle state
- information on the LBT subband set in the terminal 200 for example, busy state or idle state
- the number of BDs or CCEs set in the terminal 200 the number of BDs or CCEs set in the terminal 200.
- the base station 100 transmits a downlink signal to the terminal 200 (ST103).
- the downlink signal may include, for example, DL burst information, PDCCH setting information, or a PDCCH signal (for example, including scheduling information). This information may be included in the same signal or may be included in different signals. For example, DL burst information may be included in group common PDCCH (GC-PDCCH). Further, the PDCCH setting information may be included in the signaling information.
- DL burst information may be included in group common PDCCH (GC-PDCCH).
- GC-PDCCH group common PDCCH
- the PDCCH setting information may be included in the signaling information.
- the terminal 200 performs DL burst detection based on, for example, a signal transmitted from the base station 100 (for example, GC-PDCCH) (ST104).
- a signal transmitted from the base station 100 for example, GC-PDCCH
- the terminal 200 sets the PDCCH monitoring occurrence for the terminal 200 (ST105). For example, the terminal 200 sets the PDCCH monitoring occurrence of the terminal 200 based on the DL burst detection result, the information about the LBT subband set in the terminal 200, or the number of BDs or CCEs set in the terminal 200. You can.
- the terminal 200 receives (for example, blind decoding) the PDCCH addressed to the terminal 200 in the set PDCCH monitoring occurrence (ST106).
- the PDCCH may include, for example, information about resources scheduled (in other words, allocated) for terminal 200.
- the base station 100 and the terminal 200 communicate data (for example, uplink data or downlink data) based on the resources allocated to the terminal 200 (ST107).
- data for example, uplink data or downlink data
- ⁇ Determination method 1> when the number of BDs or CCEs set in the terminal 200 exceeds the threshold value (for example, the upper limit value such as the maximum number of BDs or the maximum number of CCEs), the base station 100 is based on the priority of the LBT subband. Determine the search space (SS) to place on the resource. For example, base station 100 drops SS based on the priority for each LBT subband. In other words, the base station 100 sets the number of BDs or the number of CCEs set in the terminal 200 to the threshold value or less by dropping SS for each LBT subband.
- the threshold value for example, the upper limit value such as the maximum number of BDs or the maximum number of CCEs
- the dropping rule that drops SS for each LBT subband may be applied in addition to the dropping rule specified in Release 15NR, for example.
- SS dropping is first executed in descending order of SSID.
- SSs are placed in resources in ascending order of SSID.
- the base station 100 determines the priority of the LBT subband when the number of BDs or CCEs of each SS exceeds the threshold value (for example, the maximum number of BDs or the maximum number of CCEs). Perform SS dropping based on.
- the base station 100 may drop SS in ascending order of priority of LBT subband. In other words, the base station 100 may arrange SSs in resources in descending order of priority of LBT subband.
- FIG. 15 shows an operation example according to the determination method 1.
- the number of BDs is considered and the number of CCEs is not considered.
- the base station 100 not only when the number of BDs set in the terminal 200 exceeds the maximum number of BDs, at least one of the number of BDs and the number of CCEs is a threshold value (for example, either the maximum number of BDs or the maximum number of CCEs). If the above is exceeded, the SS may be determined based on the dropping rule according to the determination method 1.
- the maximum number of BDs set in the terminal 200 is 44 times.
- LBT subbands # 0 to # 3 four LBT subbands (for example, LBT subbands # 0 to # 3) will be described as an example, but the number of LBT subbands is not limited to four and may be another number.
- the priority of the LBT subband is highest in the order of subband # 0, # 1, # 2, # 3 for both SS # 1 and SS # 2 (in other words, the priority of subband # 0 is the highest).
- Subband # 3 has the lowest priority).
- SS # 1 and SS # 2 for example, among the SSs (for example, SS # 1 and SS # 2) set in each subband, SS # 1 has a lower ID than SS # 2, so SS # 1 is SS. It is placed in the resource in preference to # 2.
- the number of BDs in the SS placed in each subband is set to 8 times.
- the number of BDs in SS is not limited to 8 times, and may be other times.
- FIG. 15A shows a state in which four LBT subbands # 0 to # 3 can be used for the terminal 200 as a result of LBT.
- SS # 1 having a higher priority than SS # 2
- the number of BDs set in the terminal 200 will be It will be 32 times, which is less than the maximum number of BDs (44 times). Therefore, SS # 1 is placed in each of the available LBT subband # 0 to # 3 resources (in other words, it is not dropped).
- the terminal 200 As SS # 2 having a lower priority than SS # 1, when SS # 2 is arranged in each of LBT subbands # 0 to # 3 in addition to SS # 1, the terminal 200 The number of BDs set is 64, which exceeds the maximum number of BDs (44 times). Therefore, for example, the base station 100 allocates SS # 2 to the resource in subband # 0 based on the priority of subband # 0 to # 3, and drops SS # 2 in subband # 1, # 2, and # 3. To do. By this dropping, the number of BDs set in the terminal 200 becomes 40 times, which is the maximum number of BDs (44 times) or less.
- FIG. 15B shows a state in which three LBT subbands # 1 to # 3 can be used for the terminal 200 as a result of LBT, and subband # 0 cannot be used due to LBT failure.
- the base station 100 can count, for example, excluding the number of BDs of SS (for example, 16 times) set in the unusable subband # 0 from the number of BDs for the terminal 200.
- SS # 1 having a higher priority than SS # 2
- the number of BDs set in the terminal 200 will be It will be 24 times, which is less than the maximum number of BDs (44 times). Therefore, SS # 1 is placed in each of the available LBT subband # 1 to # 3 resources (in other words, it is not dropped).
- SS # 2 having a lower priority than SS # 1 when SS # 2 is arranged in each of subbands # 1 to # 3 in addition to SS # 1, it is set in the terminal 200.
- the number of BDs to be played is 48, which exceeds the maximum number of BDs (44 times). Therefore, for example, the base station 100 arranges SS # 2 in the resource in subband # 1 and # 2 based on the priority of subband # 1 to # 3, and drops SS # 2 in subband # 3. By this dropping, the number of BDs set in the terminal 200 becomes 40 times, which is the maximum number of BDs (44 times) or less.
- the dropping rule according to the determination method 1 is not applied (for example, in the case of the dropping rule specified in Release 15 NR), LBT in any of FIGS. 15 (a) and 15 (b).
- SS # 1 is placed in the resource and SS # 2 is dropped.
- the same SS (for example, SS # 2) set in a plurality of LBT subbands is not placed in any resource of the plurality of LBT subbands.
- SS # 2 is allocated to the resource of subband # 0 in FIG. 15 (a) and is allocated to the resource of subband # 1 and # 2 in FIG. 15 (b). ..
- the same SS (for example, SS # 2) set in the plurality of LBT subbands is allocated or dropped to the resource based on the priority among the plurality of LBT subbands.
- SS # 2 set in each of the LBT subbands can be placed in a resource in some LBT subbands and dropped in the remaining LBT subbands. By this dropping rule, the base station 100 can increase the number of SSs set for the terminal 200, so that the transmission / reception efficiency of PDCCH can be improved.
- the dropping rule according to the determination method 1 when the dropping rule according to the determination method 1 is applied to Phase A shown in FIG. 7, it may be applied to all LBT subbands (for example, the same as in FIG. 15A). Further, when the dropping rule according to the determination method 1 is applied to Phase B and Phase C shown in FIG. 7, it may be applied to all LBT subbands (for example, the same as in FIG. 15A), and it is applied to the LBT result. Based on this, it may be applied to the LBT subband available for the terminal 200 (for example, the same as in FIG. 15B).
- the dropping rule according to the determination method 1 is applied to all LBT subbands (for example, when applied in Phase A), the placement of SS does not change depending on the result of LBT. Therefore, the SS determination process in the base station 100, the scheduling of the PDCCH, or the reception operation in the terminal 200 can be simplified.
- the unusable LBT subband is BD, for example, depending on the determination of the LBT. Since it can be excluded from the number count, the number of PDCCH candidates actually placed can be increased, and resource utilization efficiency can be improved.
- the priority of the LBT subband may be notified from the base station 100 to the terminal 200 by signaling information, or may be specified in the specifications (or standards). For example, the priority of the LBT subband may be set to a higher priority when the subband number is lower, or may be set to a random priority for each terminal 200.
- the priority of LBT subband may be different for each SS.
- LBT subband priorities for each SS, for example, SS can be easily placed in different LBT subbands, and the possibility that PDCCH resources collide with each other (in other words, blocking) can be reduced. ..
- the priority of the LBT subband may differ between the terminals 200. Due to the use of different LBT subband priorities for each terminal 200, for example, the LBT subband in which the PDCCH is placed is likely to be different between the terminals 200, so that the PDCCH monitoring occurrences between the terminals 200 collide (in other words, in other words). The possibility of blocking) can be reduced.
- the base station 100 may determine dropping based on the priority of some LBT subbands.
- the determination method 1 by applying the dropping rule based on the priority of the LBT subband, the SS (in other words, PDCCH monitoring occupation) that can be placed in the LBT subband increases, and the resource utilization efficiency can be improved.
- determination method 1 for example, a method of determining the priority of the LBT subband after determining the SS ID has been described.
- the threshold value for example, the maximum number of BDs or the maximum number of CCEs
- the order of priority is low based on the priority of the LBT subband. I explained how SS is dropped. However, it is not limited to this method.
- a method in which the order of determination of SSID and determination of priority of LBT subband in the above method is changed may be applied.
- a method of determining the SSID after determining the priority of the LBT subband may be used.
- the base station 100 may first drop SSs in ascending order of priority of LBT subbands, and when there are a plurality of SSs in the same LBT subband, drop SSs in descending order of SSIDs.
- FIG. 16 shows an operation example according to a modified example of the determination method 1.
- the conditions in FIG. 16 (for example, the maximum number of BDs, the number of BDs in each SS, the number of LBT subbands, the priority of LBT subbands, or the LBT results) are the same as in the example of FIG.
- the base station 100 first arranges SS in the resources of the LBT subband in the order of priority of the LBT subband (for example, in the order of subband # 0, # 1, # 2, # 3). To do.
- the base station 100 allocates SS # 1 (SS with high priority) having a low SSID to the resource in subband # 2, and drops SS # 2 having a high SSID.
- the number of BDs set in the terminal 200 becomes 40 times, which is the maximum number of BDs (44 times) or less.
- both SS # 1 and SS # 2 of subband # 3, which have a low priority, are dropped.
- SS is arranged in the resource of each LBT subband in the same procedure as in the case of FIG. 16 (a).
- SS # 2 of subband # 3 is dropped.
- the SS can be arranged in the LBT subband (in other words, in other words). Since PDCCH monitoring occurrence) increases, resource utilization efficiency can be improved. Further, in the modified example of the determination method 1, this dropping rule enables scheduling in which the PDCCH monitoring occurrence is concentrated on some LBT subbands as compared with the determination method 1, for example.
- SS unit dropping not only SS unit dropping but also PDCCH candidate unit dropping may be used.
- priority may be given to Aggregation level (AL), and SS may be arranged in descending order of priority until the maximum number of BDs or the maximum number of CCEs is reached.
- SS may be arranged in descending order of priority until the maximum number of BDs or the maximum number of CCEs is reached.
- PDCCH candidate can be assigned with finer granularity. As a result, PDCCH monitoring occurrence can be increased and resource utilization efficiency can be improved.
- dropping in units of PDCCH candidate may be applied together with the priority of LBT subband, for example.
- dropping in units of PDCCH candidate may be performed instead of dropping in units of SS.
- the priority of the LBT subband is not applied, and dropping in units of PDCCH candidate may be applied to all LBT subbands.
- dropping in units of PDCCH candidate is applied to all LBT subbands, for example, when the base station 100 has multiple SSs with the same SSID after arranging SSs based on the determination of SSIDs.
- SS dropping may be performed for all LBT subbands based on the priority of AL.
- ⁇ Determination method 2> when the LBT subband for which the PDCCH monitoring occasion is set exceeds the threshold value (for example, the maximum number of LBT subbands), the base station 100 determines the SS to be allocated to the resource based on the priority of the LBT subband. For example, base station 100 drops SS based on the priority for each LBT subband.
- the threshold value for example, the maximum number of LBT subbands
- Dropping that drops SS for each LBT subband based on the number of LBT subbands may be applied, for example, before applying the dropping rule specified in Release 15NR.
- the base station 100 drops SS based on the priority of the LBT subbands. ..
- the base station 100 may drop SSs set in the LBT subband in ascending order of priority of the LBT subband.
- the base station 100 may arrange SSs set in the LBT subband in the resource in descending order of priority of the LBT subband.
- the base station 100 After dropping based on the number of LBT subbands according to the determination method 2, the base station 100 is set to Release 15 NR, for example, when the number of BDs or CCEs in each SS exceeds the threshold value (for example, the maximum number of BDs or the maximum number of CCEs). Similarly, SS may be dropped in descending order of SSID.
- the threshold value for example, the maximum number of BDs or the maximum number of CCEs.
- FIG. 17 shows an operation example according to the determination method 2.
- the number of BDs is considered and the number of CCEs is not considered.
- the base station 100 not only when the number of BDs set in the terminal 200 exceeds the maximum number of BDs, at least one of the number of BDs and the number of CCEs is a threshold value (for example, either the maximum number of BDs or the maximum number of CCEs). If it exceeds, the SS may be determined based on the dropping rule according to the determination method 2.
- LBT subbands # 0 to # 3 four LBT subbands (for example, LBT subbands # 0 to # 3) will be described as an example, but the number of LBT subbands is not limited to four and may be another number. Further, in FIG. 17, the priority of the LBT subband is highest in the order of subband # 0, # 1, # 2, # 3 for both SS # 1 and SS # 2 (in other words, the priority of subband # 0 is the highest). , Subband # 3 has the lowest priority).
- the maximum number of LBT subbands set in the terminal 200 is two for both SS # 1 and SS # 2.
- the number of BDs in the SS placed in each subband is set to 8 times.
- the number of BDs in SS is not limited to 8 times, and may be other times.
- FIG. 17A shows a state in which four LBT subbands # 0 to # 3 can be used for the terminal 200 as a result of LBT.
- the number of LBT subbands set for both SS # 1 and SS # 2 exceeds the maximum number of LBT subbands (2). Therefore, for example, the base station 100 arranges SS # 1 and SS # 2 in resources in subband # 0 and # 1 based on the priority of subband # 0 to # 3, and SS in subband # 2 and # 3. Drop # 1 and SS # 2. By this dropping, the number of BDs set in the terminal 200 becomes 32 times, which is the maximum number of BDs (44 times) or less.
- FIG. 17B shows a state in which three LBT subbands # 1 to # 3 can be used for the terminal 200 as a result of LBT, and subband # 0 cannot be used due to LBT failure.
- the number of LBT subbands set for both SS # 1 and SS # 2 exceeds the maximum number of LBT subbands (2). Therefore, the base station 100 allocates SS # 1 and SS # 2 as resources in subband # 1 and # 2 based on the priority of subband # 1 to # 3, and SS # 1 and SS # in subband # 3. Drop 2 By this dropping, the number of BDs set in the terminal 200 becomes 32 times, which is the maximum number of BDs (44 times) or less.
- the base station 100 after the SS dropping based on the maximum number of LBT subbands, the base station 100 has a dropping rule of, for example, Release 15 NR (for example, the number of BDs or the number of CCEs). Dropping based on) may be applied.
- a dropping rule of, for example, Release 15 NR for example, the number of BDs or the number of CCEs. Dropping based on
- the dropping rule according to the determination method 2 when the dropping rule according to the determination method 2 is applied to Phase A shown in FIG. 7, it may be applied to all LBT subbands (for example, the same as in FIG. 17A). Further, when the dropping rule according to the determination method 2 is applied to Phase B and Phase C shown in FIG. 7, it may be applied to all LBT subbands (for example, the same as in FIG. 17A), and it is applied to the terminal 200. On the other hand, it may be applied to the available LBT subband (for example, the same as in FIG. 17 (b)).
- the dropping rule according to the determination method 2 is applied to all LBT subbands (for example, when applied in Phase A), the placement of SS does not change depending on the result of LBT. Therefore, the SS determination process in the base station 100, the scheduling of the PDCCH, or the reception operation in the terminal 200 can be simplified.
- the dropping rule according to the determination method 2 is applied to the LBT subband that can be used for the terminal 200 (for example, Phase B or C), for example, the unusable LBT subband is excluded according to the determination of the LBT. Since it can be done, the number of PDCCH candidates actually placed can be increased, and the resource utilization efficiency can be improved.
- At least one of the maximum number of LBT subbands and the priority of the LBT subbands may be notified from the base station 100 to the terminal 200 by signaling information, or may be specified in the specifications (or standards). ..
- the priority of the LBT subband may be set to a higher priority when the subband number is lower, or may be set to a random priority for each terminal 200.
- the maximum number of LBT subbands and at least one of the priorities may differ for each SS.
- the maximum number and priority of different LBT subbands for each SS for example, SSs are more likely to be placed in different LBT subbands, and PDCCH resources may collide with each other (in other words, blocking). Can be reduced.
- At least one of the maximum number and priority of LBT subbands may differ between the terminals 200. Due to the use of the maximum number and priority of LBT subbands that are different for each terminal 200, for example, the LBT subband in which the PDCCH is arranged is likely to be different between the terminals 200, so that the PDCCH monitoring occurrences between the terminals 200 collide ( In other words, the possibility of blocking) can be reduced.
- the dropping rule according to the determination method 2 may be applied to CSS, unlike the dropping rule of Release 15NR (for example, the dropping rule based on the maximum number of BDs or the maximum number of CCEs).
- the dropping rule of Release 15NR for example, whether or not SS is dropped is determined by the number of BDs or CCEs for each UE.
- the BD or CCE count is, for example, the sum of CSS and USS. Therefore, for example, in the dropping rule that drops SS including CSS, whether or not CSS is dropped may differ for each UE.
- CSS is assumed to be shared and used between UEs. If CSS is dropped or not for each UE, a situation may occur in which the PDCCH transmitted in CSS is received by one UE but not by another UE. In this situation, scheduling of base station 100 is expected to be complicated. Therefore, for example, it is unlikely that Release 15NR's dropping rule will be applied to CSS.
- the dropping rule according to the determination method 2 is, for example, the number of LBT subbands that can be used by the terminal 200.
- the placement of SS (in other words, SS dropping) can be determined based on. Therefore, in the determination method 2, for example, by matching the maximum number of LBT subbands and the priority setting of the LBT subbands between the terminals 200, it is possible to determine the dropping of SS (for example, CSS) between the terminals 200 according to the same determination criteria. It becomes. Therefore, the dropping rule according to the determination method 2 can also be applied to CSS.
- the base station 100 may determine dropping based on the number and priority of some LBT subbands.
- the determination method 2 by applying the dropping rule based on the number and priority of the LBT subband, the SS (in other words, PDCCH monitoring occupation) that can be placed in the LBT subband increases, and the resource utilization efficiency is improved. it can.
- the base station 100 and the terminal 200 set the PDCCH monitoring occurrence in each LBT subband (in other words, in the base station 100) based on the priority of the LBT subband (frequency resource) set in the terminal 200.
- PDCCH placement method is determined.
- the base station 100 and the terminal 200 can set the PDCCH monitoring occurrence (for example, SS or parameters such as the number of BDs and the number of CCEs) for each of a plurality of LBT subbands, thus improving the efficiency of PDCCH arrangement. it can.
- the base station 100 and the terminal 200 have Phase A (period before DL burst detection timing) and Phase B based on, for example, information regarding at least one of the maximum number of BDs and the maximum number of CCEs. And Phase C (period after DL burst detection timing) and PDCCH monitoring occurrence (in other words, PDCCH placement method) in at least one is determined.
- the base station 100 and the terminal 200 determine the LBT subband to be set for the PDCCH monitoring occupation according to each phase in DL burst detection, and determine the setting of the PDCCH monitoring occupation in the determined LBT subband. With this setting, the base station 100 and the terminal 200 can set the PDCCH monitoring occurrence suitable for each phase in DL burst detection, so that the efficiency of PDCCH arrangement can be improved.
- the transmission efficiency of the DL signal in the NR-U can be improved.
- Phase A is the period before DL burst detection, so whether or not each LBT subband is available depends on the LBT result. Therefore, in Phase A, PDCCH monitoring occurrence may be arranged in all LBT subbands. Further, in order to start transmission earlier in Phase A, it is desirable that the particle size of PDCCH monitoring occupation in the time domain is finer (in other words, PDCCH monitoring occupation is arranged in a short cycle).
- Phase C is the period after DL burst is detected, so PDCCH monitoring occurrence does not have to be placed in all LBT subbands. Further, in Phase C, if it is not necessary to schedule PDSCH in a short cycle, the particle size of PDCCH monitoring occupation in the time domain may be coarse.
- the dynamic switching of PDCCH monitoring occupation can complicate the scheduling process at the base station or the reception process at the terminal.
- the configuration of the base station and the terminal according to the present embodiment may be the same as the configuration of the base station 100 and the terminal 200 according to the first embodiment.
- the scheduling unit 104 of the base station 100 determines the PDCCH monitoring stage based on, for example, the Phase in DL burst detection. Further, the scheduling unit 104 changes the method of determining the PDCCH monitoring occupation in the LBT subband based on the determined PDCCH monitoring stage. Then, the scheduling unit 104 determines the PDCCH monitoring occupation (for example, SS) in each LBT subband based on, for example, the method of determining the PDCCH monitoring occupation.
- the PDCCH monitoring occupation for example, SS
- PDCCH monitoring stage is, for example, a period for classifying each Phase in DL burst detection based on the determination method of PDCCH monitoring occupation. For example, with respect to Phases A, B, and C shown in FIG. 7, Phases A and B may be classified into “PDCCH monitoring stage 1", and Phase C may be classified into "PDCCH monitoring stage 2". For example, the PDCCH monitoring stage may be in slot units (slot # 0 and # 1 in FIG. 7, respectively).
- the reception control unit 205 of the terminal 200 determines the PDCCH monitoring stage based on the Phase for DL burst detection, and the LBT subband is based on the determined PDCCH monitoring stage. Change the PDCCH monitoring occurrence determination method in.
- the base station 100 classifies the Phase into two PDCCH monitoring stages from the viewpoint of switching the PDCCH monitoring occupation.
- the base station 100 classifies Phase A and Phase B into PDCCH monitoring stage 1 (hereinafter, also referred to as “Stage 1”), and Phase C into PDCCH monitoring stage 2 (hereinafter, also referred to as “Stage 2”). To do.
- Phase A and Phase B included in the same slot as Phase A are classified into Stage 1
- Phase C included in a slot different from Phase A is classified into Stage 2.
- “classifying” may be read as “associating” or "associating" with each other.
- FIG. 18 shows a setting example of PDCCH monitoring occupation according to the present embodiment.
- LBT subbands for example, subbands # 0, # 1, # 2 and # 3 are set as an example.
- FIG. 18 shows an example in which the terminal 200 detects the DL burst transmitted in the subbands # 3 and # 4 in symbol # 4 of slot # 0. Therefore, in FIG. 18, the period of symbol # 0 to # 3 of slot # 0 corresponds to Phase A, the period of symbol # 4 to symbol # 13 of slot # 0 corresponds to Phase B, and after slot # 1. The period (for example, the period from symbol # 0 to # 13 of slot # 1) corresponds to Phase C. Further, in FIG. 18, as described above, Phase A and Phase B (for example, slot # 0) are classified into Stage 1, and Phase C (for example, slot # 1) is classified into Stage 2.
- the base station 100 allocates PDCCH monitoring occupation when PDCCH monitoring occurrence is set in the LBT subband (for example, subbands # 0 to # 3 in FIG. 18) to which DL burst can be transmitted.
- the LBT subband for example, subbands # 0 to # 3 in FIG. 18
- the base station 100 allocates PDCCH monitoring occurrence in the LBT subband (for example, subbands # 2 and # 3 in FIG. 18) in which the DL burst is transmitted, and the LBT in which the DL burst is not transmitted. PDCCH monitoring occurrence is not assigned in the subband (for example, subbands # 0 and # 1 in FIG. 18).
- Phase B (in other words, DL burst has been detected in at least some subbands) is also assigned the same PDCCH monitoring occurrence as Phase A (in other words, before DL burst is detected).
- Phase B DL burst has already been transmitted in at least one LBT subband.
- Phase B DL burst may not be transmitted in all LBT subbands.
- monitoring of PDCCH is continued even in the LBT subband in which DL burst is not transmitted in Phase B.
- PDCCH monitoring occurrence is effective in subbands # 0 and # 1 regardless of Phase A and Phase B.
- Phase B is also assigned the same PDCCH monitoring occurrence as Phase A (in other words, before DL burst is detected).
- this PDCCH monitoring occupation for example, when an LBT subband that was not available near the beginning of Phase B becomes available in the middle of Phase B, the terminal 200 can add an LBT subband to be used. , Resource utilization efficiency can be improved.
- the terminal 200 can perform DL burst detection regardless of which LBT subband becomes available.
- the number of BDs in the PDCCH monitoring occurrence placed in each symbol of each subband may be set to, for example, once.
- the number of BDs it is possible to suppress the increase in the number of BDs in the frequency domain and increase the number of BDs in the time domain, so that the particle size of PDCCH monitoring occurrence in the time domain can be set more finely.
- the PDCCH monitoring occurrence is arranged every two symbols.
- the same (for example, the same) payload size may be set between the GC-PDCCH used for DLburs detection and the PDCCH used for PDSCH scheduling and the like.
- the terminal 200 can receive both GC-PDCCH and PDCCH by one BD.
- PDCCH monitoring occurrences are placed in the LBT subbands where DL burst is detected (for example, subbands # 2 and # 3 in FIG. 18), and LBT subbands where DL burst is not detected (for example, subband # in FIG. 18). PDCCH monitoring occurrence is not placed in 0 and # 1).
- the arrangement of PDCCH monitoring occupation different from Stage 1 may be set.
- one PDCCH monitoring occurrence in the time domain may be arranged for each slot.
- PDCCH monitoring occurrences may be arranged in a distributed manner in the time domain, whereas in Stage 2, PDCCH monitoring occurrences may be arranged intensively in the time domain.
- the PDCCH monitoring occurrence set in Stage 2 is arranged in a wider range of the frequency domain as compared with the PDCCH monitoring occurrence set in Stage 1. ..
- the allocation of PDCCH monitoring occurrence set for Stage 1 is continued regardless of the presence / absence of DL burst detection (in other words, Phase). ..
- PDCCH monitoring occurrence cannot be switched during Stage 1no.
- the PDCCH monitoring occurrence may be switched between Stage 1 and Stage 2 (in other words, between slots). By this switching, the number of switching of PDCCH monitoring occupation can be reduced.
- the base station 100 and the terminal 200 have Phase A (a period before the DL burst detection timing) and Phase A (a period before the DL burst detection timing) based on information on at least one of the maximum BD number and the maximum CCE number, for example.
- Determine the PDCCH monitoring occurrence in other words, the method of arranging the PDCCH in at least one of Phase B and Phase C (the period after the DL burst detection timing).
- the same PDCCH monitoring occupation assignment (in other words, PDCCH arrangement method) is set for Phase A and Phase B of Stage 1.
- Stage 1 for example, Phase A and Phase B
- Stage 2 for example, (Phase C)
- Stage 1 and Stage 2 have different PDCCH monitoring occupations.
- the presence or absence of PDCCH monitoring occupation in the LBT subband where DL burst is not transmitted can be switched.
- PDCCH monitoring occupations can be switched in time resource units (for example, slot units).
- time resource units for example, slot units.
- a PDCCH monitoring occurrence can be assigned according to each Phase in DL burst detection.
- the arrangement of PDCCH monitoring occupations in each stage shown in FIG. 18 is an example, and is not limited to the example shown in FIG.
- the number of BDs of the PDCCH monitoring occupation placed in each symbol of Stage 1 is not limited to one, and may be multiple.
- at least one of the symbol position and the number of symbols in which the PDCCH monitoring occurrence is arranged in Stage 1 and Stage 2 is not limited to the example shown in FIG. 18, and may be another position or another number.
- a number of CORESET and SS setting information corresponding to the number of assigned patterns of the PDCCH monitoring occasion may be prepared. Then, the PDCCH monitoring occasion can be switched by switching the setting information of CORESET and SS.
- the number of CORESET and SS there is a limit to the number of CORESET and SS that can be set. Therefore, there is room to consider how to switch the PDCCH monitoring occasion while suppressing the increase in the number of CORESET and SS.
- the configurations of the base station and the terminal according to the present embodiment may be the same as the configurations of the base station 100 and the terminal 200 according to the first embodiment, respectively.
- the scheduling unit 104 of the base station 100 switches the dropping rule to be applied according to, for example, the current Phase.
- the scheduling unit 104 may make an SS dropping determination based on, for example, the switched dropping rule.
- the reception control unit 205 of the terminal 200 switches the dropping rule to be applied according to the current Phase, similarly to the scheduling unit 104.
- the reception control unit 205 makes an SS dropping determination based on, for example, the switched dropping rule.
- the base station 100 applies a dropping rule (in other words, a non-setting rule of PDCCH monitoring occurrence) according to a phase (for example, Phase A, Phase B or Phase C) in DL burst detection. ) Is switched.
- a dropping rule in other words, a non-setting rule of PDCCH monitoring occurrence
- a phase for example, Phase A, Phase B or Phase C
- different dropping rules may be applied for each phase. By applying this dropping rule, it is possible to set PDCCH monitoring occupation according to the phase.
- FIG. 19 shows a setting example of PDCCH monitoring occupation according to the present embodiment.
- FIG. 19A shows an example of the state when PDCCH monitoring occurrence is set.
- PDCCH monitoring occurrence for example, SS or BD
- PDCCH monitoring occurrence is set for every 2 symbols (for example, even-numbered symbols) in each LBT subband.
- the number of PDCCH candidates in each symbol of each LBT subband is 11 (in other words, the number of BDs is 11).
- FIG. 19B shows an example of setting PDCCH monitoring occupation in Phase A.
- 11 PDCCH candidate (in other words, 11 BD) was set in the PDCCH monitoring occurrence in each symbol of each LBT subband, whereas in FIG. 19 (b), 1 PDCCH candidate (1 PDCCH candidate) ( In other words, 1 BD) is set.
- 1 PDCCH candidate (1 PDCCH candidate) ( In other words, 1 BD) is set.
- 10 PDCCH candidate is dropped and 1 PDCCH candidate is set.
- any of the following methods (1) to (3) may be applied to the dropping rule in FIG. 19 (b).
- the PDCCH candidate of a certain AL the PDCCH candidate and the PDCCH monitoring occurrence excluding one PDCCH candidate are dropped.
- the selection method of one PDCCH candidate for example, the first PDCCH candidate may be selected, the PDCCH candidate may be randomly selected, the PDCCH candidate may be specified by signaling, or the PDCCH candidate may be specified by another method. May be selected.
- Priority is given based on the AL of the PDCCH candidate and the PDCCH candidate number in the AL, and the number of BDs or CCEs set in the terminal 200 exceeds the threshold value (for example, the maximum number of BDs or the maximum number of CCEs). In some cases, PDCCH candidate and PDCCH monitoring occurrence are dropped.
- the PDCCH candidate number may correspond to ms, nCI in Section 10.1 of Non-Patent Document 3, for example.
- the maximum value of CCE is 56 CCE
- 4 subband ⁇ 7 symbol ⁇ 2 CCE 56 CCE. Therefore, in the PDCCH monitoring occurrence of each even symbol of each LBT subband, AL Two PDCCH candidates are placed one by one, and PDCCH candidates and PDCCH monitoring occurrences of ALs that are different from AL2 are dropped.
- PDCCH candidate and PDCCH monitoring occurrence are dropped based on the SS ID.
- the PDCCH candidate of SS ID # 1 is placed in the PDCCH monitoring occurrence of each even symbol of each LBT subband, and the PDCCH candidate and PDCCH monitoring occurrence of SS ID # 2 are dropped.
- FIG. 19 (c) shows a setting example of PDCCH monitoring occupation in Phase C.
- either of the following methods (4) or (5) may be applied to the dropping rule in FIG. 19 (c).
- PDCCH candidate and PDCCH monitoring occurrence are dropped based on the SS ID.
- SS ID # 1 (11 BDs) is set for symbol # 0
- SS ID # 2 (11 BDs) is set for other Symbols different from symbol # 0.
- PDCCH candidate and PDCCH monitoring occurrence of symbol # 0 are placed, and PDCCH candidate and PDCCH monitoring occurrence of other symbols different from symbol # 0 are dropped. The symbol.
- different PDCCH arrangements can be set in each Phase by applying different dropping rules in each Phase.
- the dropping rules of Phase A and Phase C have been described, but the present invention is not limited to this, and different dropping rules may be applied in any Phase. Further, for example, a different dropping rule may be applied to each “PDCCH monitoring stage” defined in the second embodiment.
- association between the Phase and the dropping rule may be notified from the base station 100 to the terminal 200 by signaling information, or may be specified in the specifications (or standards).
- the base station 100 and the terminal 200 have Phase A (the period before the DL burst detection timing) and Phase B and Phase C (the period before the DL burst detection timing) based on the information regarding at least one of the maximum BD number and the maximum CCE number, for example.
- Determine the PDCCH monitoring occurrence in other words, the method of arranging the PDCCH in at least one of the period after the DL burst detection timing.
- the base station 100 and the terminal 200 set the dropping rule (in other words, the rule for determining the resource in which the PDCCH is not arranged) for each Phase in DL burst detection or the PDCCH monitoring stage (in other words, PDCCH monitoring stage). Set for each slot).
- different dropping rules are set depending on the Phase or Stage.
- the base station 100 and the terminal 200 can set the arrangement of PDCCH according to each Phase or each Stage.
- the PDCCH arrangement can be changed by changing the dropping rule. Therefore, in the present embodiment, for example, different CORESET and SS are set to change the PDCCH arrangement. Compared with the method, the CORESET / SS setting can be reduced.
- the downlink control channel for transmitting the control signal is not limited to the PDCCH, and may be a control channel having another name.
- the unit (or unit time interval) of the time resource is not limited to the case of slot or symbol, and may be another time resource unit (for example, subframe, frame or minislot).
- the unit of frequency resource is not limited to the case of subband, and other frequency resource unit (for example, resource block (PRB: Physical Resource Block), RB group (RBG), BWP, subcarrier or resource element group (for example). REG) etc.) may be used.
- PRB Physical Resource Block
- RBG RB group
- BWP subcarrier or resource element group (for example).
- REG resource element group
- Each functional block used in the description of the above embodiment is partially or wholly realized as an LSI which is an integrated circuit, and each process described in the above embodiment is partially or wholly. It may be controlled by one LSI or a combination of LSIs.
- the LSI may be composed of individual chips, or may be composed of one chip so as to include a part or all of functional blocks.
- the LSI may include data input and output.
- LSIs may be referred to as ICs, system LSIs, super LSIs, and ultra LSIs depending on the degree of integration.
- the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of the circuit cells inside the LSI may be used.
- FPGA Field Programmable Gate Array
- the present disclosure may be realized as digital processing or analog processing.
- the communication device may include a wireless transceiver and a processing / control circuit.
- the wireless transmitter / receiver may include a receiver and a transmitter, or those as functions.
- the radio transmitter / receiver (transmitter, receiver) may include an RF (Radio Frequency) module and one or more antennas.
- RF modules may include amplifiers, RF modulators / demodulators, or the like.
- Non-limiting examples of communication devices include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital stills / video cameras, etc.).
- Digital players digital audio / video players, etc.
- wearable devices wearable cameras, smart watches, tracking devices, etc.
- game consoles digital book readers
- telehealth telemedicines remote health Care / medicine prescription
- vehicles with communication functions or mobile transportation automobiles, airplanes, ships, etc.
- combinations of the above-mentioned various devices can be mentioned.
- Communication devices are not limited to those that are portable or mobile, but are all types of devices, devices, systems that are not portable or fixed, such as smart home devices (home appliances, lighting equipment, smart meters or Includes measuring instruments, control panels, etc.), vending machines, and any other "Things” that can exist on the IoT (Internet of Things) network.
- smart home devices home appliances, lighting equipment, smart meters or Includes measuring instruments, control panels, etc.
- vending machines and any other “Things” that can exist on the IoT (Internet of Things) network.
- Communication includes data communication using a combination of these, in addition to data communication using a cellular system, wireless LAN system, communication satellite system, etc.
- the communication device also includes a device such as a controller or a sensor that is connected or connected to a communication device that executes the communication function described in the present disclosure.
- a device such as a controller or a sensor that is connected or connected to a communication device that executes the communication function described in the present disclosure.
- it includes controllers and sensors that generate control and data signals used by communication devices that perform the communication functions of the communication device.
- Communication devices also include infrastructure equipment that communicates with or controls these non-limiting devices, such as base stations, access points, and any other device, device, or system. ..
- the base station is based on information about at least one of the number of blind decodings for the downlink control channel signal and the number of resources for channel estimation, and the first period before the timing based on the carrier sense.
- the control circuit that determines the arrangement method of the downlink control channel signal in at least one of the second period after the timing based on the carrier sense, and the downlink control channel signal is transmitted based on the determined arrangement method. It is provided with a transmission circuit to be used.
- the placement method is based on the priority of a plurality of frequency resources.
- the placement method is based on the priorities of the plurality of frequency resources in the first period and in the carrier sense of the plurality of frequency resources in the second period. Based on said priority of at least one frequency resource.
- the placement method does not place the downlink control channel signal based on the priority when at least one of the number of blind decodings and the number of resources exceeds a threshold.
- the same arrangement method is set for the first period and the period included in the same unit time interval as the first period of the second period. ..
- an arrangement method different from the arrangement method in the first period is set in the period included in the unit time interval different from the first period in the second period.
- control circuit sets the arrangement method including a rule for determining a resource for which the downlink control channel signal is not arranged in the first period and the second period, respectively. Alternatively, it is set for each unit time interval.
- the terminal has a first period prior to the downlink burst detection timing and a first period based on information about at least one of the number of blind decodings for the downlink control channel signal and the number of resources for channel estimation.
- a control circuit that determines a reception opportunity of the downlink control channel signal in at least one of the second period after the detection timing, and a reception circuit that receives the downlink control channel signal at the determined reception opportunity. Equipped.
- the base station is based on information about at least one of the number of blind decodings for the downlink control channel signal and the number of resources for channel estimation, and the first before the timing based on the carrier sense.
- the method of arranging the downlink control channel signal in at least one of the period 1 and the second period after the timing based on the carrier sense is determined, and the downlink control channel signal is used based on the determined arrangement method. Send.
- the terminal is the first before the detection timing of the downlink burst based on the information regarding at least one of the number of blind decodings for the downlink control channel signal and the number of resources for channel estimation.
- the reception opportunity of the downlink control channel signal in at least one of the period of the above and the second period after the detection timing is determined, and the downlink control channel signal is received at the determined reception opportunity.
- One embodiment of the present disclosure is useful for wireless communication systems.
- Base station 101 101,201 Reception unit 102,202 Demodulation / decoding unit 103 Channel state estimation unit 104 Scheduling unit 105,204 Control information holding unit 106 Data / control information generation unit 107,208 Coding / modulation unit 108,209 Transmission unit 200 Terminal 203 DL Transmission detection unit 205 Reception control unit 206 Transmission control unit 207 Data generation unit
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Abstract
Description
3GPPは、100GHzまでの周波数範囲で動作する新無線アクセス技術(NR)の開発を含む第5世代携帯電話技術(単に「5G」ともいう)の次のリリースに向けて作業を続けている。5G規格の初版は2017年の終わりに完成しており、これにより、5G NRの規格に準拠した端末(例えば、スマートフォン)の試作および商用展開に移ることが可能となっている。
図2は、NG-RANと5GCとの間の機能分離を示す。NG-RANの論理ノードは、gNBまたはng-eNBである。5GCは、論理ノードAMF、UPF、およびSMFを有する。
- 無線ベアラ制御(Radio Bearer Control)、無線アドミッション制御(Radio Admission Control)、接続モビリティ制御(Connection Mobility Control)、上りリンクおよび下りリンクの両方におけるリソースのUEへの動的割当(スケジューリング)等の無線リソース管理(Radio Resource Management)の機能;
- データのIPヘッダ圧縮、暗号化、および完全性保護;
- UEが提供する情報からAMFへのルーティングを決定することができない場合のUEのアタッチ時のAMFの選択;
- UPFに向けたユーザプレーンデータのルーティング;
- AMFに向けた制御プレーン情報のルーティング;
- 接続のセットアップおよび解除;
- ページングメッセージのスケジューリングおよび送信;
- システム報知情報(AMFまたは運用管理保守機能(OAM:Operation, Admission, Maintenance)が発信源)のスケジューリングおよび送信;
- モビリティおよびスケジューリングのための測定および測定報告の設定;
- 上りリンクにおけるトランスポートレベルのパケットマーキング;
- セッション管理;
- ネットワークスライシングのサポート;
- QoSフローの管理およびデータ無線ベアラに対するマッピング;
- RRC_INACTIVE状態のUEのサポート;
- NASメッセージの配信機能;
- 無線アクセスネットワークの共有;
- デュアルコネクティビティ;
- NRとE-UTRAとの緊密な連携。
- Non-Access Stratum(NAS)シグナリングを終端させる機能;
- NASシグナリングのセキュリティ;
- Access Stratum(AS)のセキュリティ制御;
- 3GPPのアクセスネットワーク間でのモビリティのためのコアネットワーク(CN:Core Network)ノード間シグナリング;
- アイドルモードのUEへの到達可能性(ページングの再送信の制御および実行を含む);
- 登録エリアの管理;
- システム内モビリティおよびシステム間モビリティのサポート;
- アクセス認証;
- ローミング権限のチェックを含むアクセス承認;
- モビリティ管理制御(加入およびポリシー);
- ネットワークスライシングのサポート;
- Session Management Function(SMF)の選択。
- intra-RATモビリティ/inter-RATモビリティ(適用可能な場合)のためのアンカーポイント;
- データネットワークとの相互接続のための外部PDU(Protocol Data Unit)セッションポイント;
- パケットのルーティングおよび転送;
- パケット検査およびユーザプレーン部分のポリシールールの強制(Policy rule enforcement);
- トラフィック使用量の報告;
- データネットワークへのトラフィックフローのルーティングをサポートするための上りリンククラス分類(uplink classifier);
- マルチホームPDUセッション(multi-homed PDU session)をサポートするための分岐点(Branching Point);
- ユーザプレーンに対するQoS処理(例えば、パケットフィルタリング、ゲーティング(gating)、UL/DLレート制御(UL/DL rate enforcement);
- 上りリンクトラフィックの検証(SDFのQoSフローに対するマッピング);
- 下りリンクパケットのバッファリングおよび下りリンクデータ通知のトリガ機能。
- セッション管理;
- UEに対するIPアドレスの割当および管理;
- UPFの選択および制御;
- 適切な宛先にトラフィックをルーティングするためのUser Plane Function(UPF)におけるトラフィックステアリング(traffic steering)の設定機能;
- 制御部分のポリシーの強制およびQoS;
- 下りリンクデータの通知。
図3は、NAS部分の、UEがRRC_IDLEからRRC_CONNECTEDに移行する際のUE、gNB、およびAMF(5GCエンティティ)の間のやり取りのいくつかを示す(TS 38.300 v15.6.0参照)。
図4は、5G NRのためのユースケースのいくつかを示す。3rd generation partnership project new radio(3GPP NR)では、多種多様なサービスおよびアプリケーションをサポートすることがIMT-2020によって構想されていた3つのユースケースが検討されている。大容量・高速通信(eMBB:enhanced mobile-broadband)のための第一段階の仕様の策定が終了している。現在および将来の作業には、eMBBのサポートを拡充していくことに加えて、高信頼・超低遅延通信(URLLC:ultra-reliable and low-latency communications)および多数同時接続マシンタイプ通信(mMTC:massive machine-type communicationsのための標準化が含まれる。図4は、2020年以降のIMTの構想上の利用シナリオのいくつかの例を示す(例えばITU-R M.2083 図2参照)。
5GのQoS(Quality of Service)モデルは、QoSフローに基づいており、保証されたフロービットレートが求められるQoSフロー(GBR:Guaranteed Bit Rate QoSフロー)、および、保証されたフロービットレートが求められないQoSフロー(非GBR QoSフロー)をいずれもサポートする。したがって、NASレベルでは、QoSフローは、PDUセッションにおける最も微細な粒度のQoSの区分である。QoSフローは、NG-Uインタフェースを介してカプセル化ヘッダ(encapsulation header)において搬送されるQoSフローID(QFI:QoS Flow ID)によってPDUセッション内で特定される。
例えば、非キャリアアグリゲーション(CC:Carrier Aggregation)時における、最大BD数及び最大CCE数は図6のように定義され得る(例えば、非特許文献3を参照)。図6に示す最大BD数及び最大CCE数は、例えば、端末毎かつslot毎の値を示す。
- 共通サーチスペース(CSS:common search space)のPDCCH candidate及びPDCCH monitoring occasionはdropされない。
- UE個別サーチスペース(USS:UE-specific search space)において、設定されたPDCCH candidateが最大BD数又は最小CCE数を超える場合、サーチスペースの識別番号(例えば、search space ID(SS ID)と呼ぶ)の高い順にサーチスペースがdropされる(換言すると、リソースが割り当てられない)。
- dropping ruleは、Secondary cellには適用されない。換言すると、dropping ruleは、Primary cellに適用される。
DL burst検出には、例えば、以下の3つのフェーズが議論されている。図7は、3つのフェーズの一例を示す。
Phase A:DL burst検出前
Phase B:DL burst検出後かつslot(図7ではslot#0)境界到達前(partial slot)
Phase C:DL burst検出後かつslot(図7ではslot#0)境界到達後(full slot)
Release 15 NRでは、例えば、端末に下りリンク制御チャネルを割り当て可能な領域であるcontrol resource set(CORESET)又はsearch space(SS)の数には、以下の規定がある。
CORESET:3個(bandwidth part(BWP)毎)
SS:10個(BWP毎)
上述したように、NR-Uでは、同一CORESET及びSSを複数のsubbandそれぞれに配置可能とすることが合意されている。
[通信システムの概要]
本開示の一態様に係る通信システムは、例えば、図10及び図12に示す基地局100(例えば、gNB)、及び、図11及び図13に示す端末200(例えば、UE)及びを備える。
図12は、本開示の一態様に係る基地局100の構成例を示すブロック図である。図12において、基地局100は、受信部101と、復調・復号部102と、チャネル状態推定部103と、スケジューリング部104と、制御情報保持部105と、データ・制御情報生成部106と、符号化・変調部107と、送信部108と、を有する。
図13は、本開示の一態様に係る端末200の構成例を示すブロック図である。図13において、端末200は、受信部201と、復調・復号部202と、DL送信検出部203と、制御情報保持部204と、受信制御部205と、送信制御部206と、データ生成部207と、符号化・変調部208と、送信部209と、を有する。
以上の構成を有する基地局100及び端末200における動作例について説明する。
基地局100のスケジューリング部104におけるPDCCH monitoring occasionの決定方法の一例について説明する。また、端末200の受信制御部205は、スケジューリング部104と同様の決定方法に基づいて、PDCCH monitoring occasionを判定してよい。
決定方法1では、基地局100は、端末200に設定されるBD数又はCCE数が閾値(例えば、最大BD数又は最大CCE数といった上限値)を超える場合、LBT subbandの優先度に基づいて、リソースに配置するsearch space(SS)を決定する。例えば、基地局100は、LBT subband毎の優先度に基づいて、SSをdropする。換言すると、基地局100は、LBT subband毎にSSをdropすることにより、端末200に設定されるBD数又はCCE数を閾値以下に設定する。
なお、決定方法1では、例えば、SS IDの判定の後にLBT subbandの優先度の判定を行う方法について説明した。換言すると、同じSS IDのSSが複数有る場合に、BD数又はCCE数が閾値(例えば、最大BD数又は最大CCE数)を超える場合に、LBT subbandの優先度に基づいて優先度の低い順にSSがdropされる方法について説明した。しかし、この方法に限定されない。
決定方法2では、基地局100は、PDCCH monitoring occasionを設定するLBT subbandが閾値(例えば、最大LBT subband数)を超える場合、LBT subbandの優先度に基づいて、リソースに配置するSSを決定する。例えば、基地局100は、LBT subband毎の優先度に基づいて、SSをdropする。
DL burst検出に関する各Phase(例えば、図7に示すPhase A、B及びC)では、所望のPDCCH monitoring occasion配置が異なることが想定される。
本実施の形態に係る基地局及び端末の構成は、実施の形態1に係る基地局100及び端末200の構成と共通でよい。
基地局100のスケジューリング部104におけるPDCCH monitoring occasionの決定方法の一例について説明する。また、端末200の受信制御部205は、スケジューリング部104と同様の決定方法に基づいて、PDCCH monitoring occasionを判定してよい。
PDCCH monitoring occasionの切り替えには、例えば、PDCCH monitoring occasionの割り当てパターン数に相当する数のCORESET及びSSの設定情報が用意され得る。そして、CORESET及びSSの設定情報の切り替えによって、PDCCH monitoring occasionが切り替えられ得る。しかし、前述の通り、設定可能なCORESET及びSSの数には制限がある。そのため、CORESET及びSSの数の増加を抑えてPDCCH monitoring occasionを切り替える方法について検討する余地がある。
本実施の形態に係る基地局及び端末の構成は、それぞれ、実施の形態1に係る基地局100及び端末200の構成と共通でよい。
基地局100のスケジューリング部104におけるPDCCH monitoring occasionの決定方法の一例について説明する。また、端末200の受信制御部205は、スケジューリング部104と同様の決定方法に基づいて、PDCCH monitoring occasionを判定してよい。
上記各実施の形態における、「PDCCH candidate及びPDCCH monitoring occasionがdropされる」という記載は、PDCCH candidate及びPDCCH monitoring occasionが配置(mapping)されないと読み替えてよい。同様に、「PDCCH candidate及びPDCCH monitoring occasionがdropされない」という記載は、PDCCH candidate及びPDCCH monitoring occasionが配置(mapping)されると読み替えてよい。また、「PDCCH candidate及びPDCCH monitoring occasionがdropされる」という記載であっても、例えば、同じPDCCH monitoring occasion(時間、周波数リソース)に複数のPDCCH candidateが設定されている場合には、PDCCH monitoring occasionはdropされない場合があってよい。
101,201 受信部
102,202 復調・復号部
103 チャネル状態推定部
104 スケジューリング部
105,204 制御情報保持部
106 データ・制御情報生成部
107,208 符号化・変調部
108,209 送信部
200 端末
203 DL送信検出部
205 受信制御部
206 送信制御部
207 データ生成部
Claims (10)
- 下り制御チャネル信号についてのブラインド復号回数及びチャネル推定についてのリソース数の少なくとも1つに関する情報に基づいて、キャリアセンスに基づくタイミング以前の第1の期間と、前記キャリアセンスに基づくタイミング以後の第2の期間との少なくとも一つにおける前記下り制御チャネル信号の配置方法を決定する制御回路と、
決定された前記配置方法に基づいて前記下り制御チャネル信号を送信する送信回路と、
を具備する基地局。 - 前記配置方法は、複数の周波数リソースの優先度に基づく、
請求項1に記載の基地局。 - 前記配置方法は、前記第1の期間において、前記複数の周波数リソースの前記優先度に基づき、前記第2の期間において、前記複数の周波数リソースのうち前記キャリアセンスに基づく少なくとも1つの周波数リソースの前記優先度に基づく、
請求項2に記載の基地局。 - 前記配置方法は、前記ブラインド復号回数及び前記リソース数の少なくとも一つが閾値を超える場合、前記優先度に基づいて前記下り制御チャネル信号を配置しない、
請求項2に記載の基地局。 - 前記第1の期間と、前記第2の期間のうち前記第1の期間と同一単位時間区間内に含まれる期間とには、同一の前記配置方法が設定される、
請求項1に記載の基地局。 - 前記第2の期間のうち、前記第1の期間と異なる単位時間区間内に含まれる期間には、前記第1の期間における前記配置方法と異なる配置方法が設定される、
請求項5に記載の基地局。 - 前記制御回路は、前記下り制御チャネル信号を配置しないリソースを決定するルールを含む前記配置方法を、前記第1の期間と前記第2の期間とにそれぞれ設定する、又は、単位時間区間毎に設定する、
請求項1に記載の基地局。 - 下り制御チャネル信号についてのブラインド復号回数及びチャネル推定についてのリソース数の少なくとも1つに関する情報に基づいて、下りバーストの検出タイミング以前の第1の期間と、前記検出タイミング以後の第2の期間との少なくとも一つにおける前記下り制御チャネル信号の受信機会を決定する制御回路と、
決定された前記受信機会において前記下り制御チャネル信号を受信する受信回路と、
を具備する端末。 - 基地局は、
下り制御チャネル信号についてのブラインド復号回数及びチャネル推定についてのリソース数の少なくとも1つに関する情報に基づいて、キャリアセンスに基づくタイミング以前の第1の期間と、前記キャリアセンスに基づくタイミング以後の第2の期間との少なくとも一つにおける前記下り制御チャネル信号の配置方法を決定し、
決定された前記配置方法に基づいて前記下り制御チャネル信号を送信する、
送信方法。 - 端末は、
下り制御チャネル信号についてのブラインド復号回数及びチャネル推定についてのリソース数の少なくとも1つに関する情報に基づいて、下りバーストの検出タイミング以前の第1の期間と、前記検出タイミング以後の第2の期間との少なくとも一つにおける前記下り制御チャネル信号の受信機会を決定し、
決定された前記受信機会において前記下り制御チャネル信号を受信する、
受信方法。
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