Two-part wake-up signal structure

Abstract

A communications device, a base station, and a method for the communications device and the base station are provided. The communications device includes a transceiver that, in operation, receives a wireless signal. The communications device further includes circuitry that, in operation, (i) detects the presence of a wake-up signal (WUS) in the received wireless signal, (ii) determines wake-up information from the received wireless signal based on the WUS, and (iii) determines, based on the wake-up information, that control information other than the WUS and the wake-up information has been received.

Description

[Technical Field]

[0001] 1.Technical Field FIELD OF THE DISCLOSURE The present disclosure relates to transmitting and receiving signals in a communication system. In particular, the present disclosure relates to methods and apparatus for such transmission and reception. [Background technology]

[0002] 2. Description of Related Technology The 3rd Generation Partnership Project (3GPP®) is working on technical specifications for next-generation cellular technology (also known as fifth generation (5G)), including New Radio (NR) access technology (RAT), operating in the frequency range up to 100 GHz. NR is the successor to technologies represented by Long Term Evolution (LTE) and LTE Advanced (LTE-A).

[0003] In systems such as LTE, LTE-A, and NR, further improvements and options may facilitate efficient operation of the communication system and certain devices associated with the communication system. Summary of the Invention [Problem to be solved by the invention]

[0004] One non-limiting exemplary embodiment facilitates efficient low power operation of a communications device. [Means for solving the problem]

[0005] In one embodiment, the disclosed technology features a user equipment having, during operation, a transceiver unit that receives a wireless signal, and circuitry that (i) detects the presence of a wake-up signal (WUS) in the received wireless signal, (ii) determines wake-up information from the received wireless signal based on the WUS, and (iii) determines, based on the wake-up information, that control information other than the WUS and the wake-up information is received.

[0006] It should be noted that the general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0007] Further advantages and benefits of an embodiment of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, but not all of them necessarily need to be provided to obtain one or more identical features.

[0008] The following exemplary embodiments are described in more detail with reference to the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 illustrates an example architecture of a 3GPP NR system. [Figure 2] Schematic diagram showing the functional division between NG-RAN and 5GC [Figure 3] Sequence diagram of RRC connection setup / reconfiguration procedure [Figure 4] Schematic diagram showing usage scenarios for high-speed, large-capacity (eMBB: enhanced Mobile Broadband), multiple simultaneous connections (mMTC: massive Machine Type Communications), and ultra-reliable and low latency (URLLC: Ultra Reliable and Low Latency Communications) [Figure 5] Block diagram illustrating an exemplary 5G system architecture for a non-roaming scenario [Figure 6] FIG. 1 is a block diagram illustrating a base station and a communication device in an embodiment of a communication system using a wake-up signal including one or more blank resource elements. [Figure 7] Schematic diagram illustrating a wake-up signal represented by a sequence of muted and unmuted resource elements in the time domain. [Figure 8] 1 is a schematic diagram illustrating a wake-up signal represented by a sequence of muted and unmuted resource elements in the frequency domain; [Figure 9] Block diagram showing the functional structure of the WUS detection circuit [Figure 10] Block diagram showing the functional structure of the WUS generation circuit [Figure 11] 1 is a flowchart illustrating steps of a communication method for user equipment; [Figure 12] Flowchart showing steps of a communication method for a network node (base station) [Figure 13] FIG. 1 is a block diagram illustrating a base station and a communication device in a communication system according to an embodiment of two-part wake-up signaling. [Figure 14] Block diagram showing the functional structure of the WUS / WUI detection circuit [Figure 15] Block diagram showing the functional structure of the WUS / WUI generation circuit [Figure 16] Schematic diagram showing the offset between the wake-up signal and the wake-up information [Figure 17] Schematic showing the offset between the wake-up signal and the received SSB [Figure 18] FIG. 1 is a schematic diagram illustrating the offset between a received wake-up signal or wake-up information and a PDCCH monitoring opportunity. [Figure 19] 1 is a flowchart illustrating steps of a communication method for user equipment; [Figure 20] 1 is a flowchart illustrating steps in a method for communicating with a network node. DETAILED DESCRIPTION OF THE INVENTION

[0010] <5G NR system architecture and protocol stack> 3GPP is working on the next release of fifth-generation cellular technology (known simply as "5G"), which includes the development of a new radio access technology (NR) that will operate in frequencies up to 100 GHz. The first version of the 5G standard was completed at the end of 2017, allowing for the testing and commercial deployment of smartphones compliant with the 5G NR standard.

[0011] In particular, the overall system architecture assumes a Next Generation Radio Access Network (NG-RAN) with gNodeBs (gNBs), which terminate NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) protocols and control plane (Radio Resource Control (RRC)) protocols toward UEs. The gNBs are interconnected with each other via an Xn interface. The gNBs are also connected to the Next Generation Core (NGC) via a Next Generation (NG) interface, more specifically to the Access and Mobility Management Function (AMF) (e.g., a specific core entity that runs the AMF) via an NG-C interface, and to the User Plane Function (UPF) (e.g., a specific core entity that runs the UPF) via an NG-U interface. The NG-RAN architecture is shown in Figure 1 (see, e.g., Section 4 of 3GPP TS 38.300 v15.6.0).

[0012] The user plane protocol stack in NR (see, for example, Section 4.4.1 of 3GPP TS 38.300) includes the PDCP (Packet Data Convergence Protocol) sublayer, the RLC (Radio Link Control) sublayer, and the MAC (Medium Access Control) sublayer, which are terminated at the gNB on the network side. In addition, a new access stratum (AS) sublayer (SDAP, Service Data Adaptation Protocol) is introduced above PDCP (see, for example, Section 6.5 of 3GPP TS 38.300). A control plane protocol stack is also defined in NR (see, for example, Section 4.4.2 of TS 38.300). An overview of Layer 2 functionality is given in TS 38.300, clause 6. The functionality of the PDCP, RLC, and MAC sublayers is given in TS 38.300, clauses 6.4, 6.3, and 6.2, respectively. The functionality of the RRC layer is given in TS 38.300, clause 7.

[0013] For example, the Medium-Access-Control (MAC) layer handles scheduling and scheduling-related functions, including multiplexing logical channels and handling various numerologies.

[0014] The physical layer (PHY) is responsible for, for example, coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources. The physical layer also handles mapping of transport channels to physical channels. The physical layer provides services to the MAC layer in the form of transport channels. A physical channel corresponds to a set of time-frequency resources used for transmitting a specific transport channel, and each transport channel is mapped to a corresponding physical channel. For example, physical channels are the PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) for the uplink, and the PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), and PBCH (Physical Broadcast Channel) for the downlink.

[0015] NR use cases / deployment scenarios include enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), and / or massive machine-type communications (mMTC), which have diverse requirements for data rates, latency, and coverage. For example, eMBB is expected to support peak data rates (20 Gbps downlink and 10 Gbps uplink) and user-perceived data rates on the order of three times those offered by IMT-Advanced. In contrast, URLLC has more stringent requirements, including extremely low latency (user plane latency of 0.5 ms for UL and DL, respectively) and high reliability (1-10 Mbps within 1 ms). -5) and mMTC requires high connection density (1 km in urban environments). 2 1,000,000 devices per second), wide coverage in harsh environments, and extremely long battery life (15 years) to lower device costs may preferably be required.

[0016] Therefore, an OFDM numerology (e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) suitable for one use case may not work well for another use case. For example, low-latency services may preferably require a shorter symbol length (and therefore a larger subcarrier spacing) and / or fewer symbols per scheduling interval (also referred to as TTI) than mMTC services. Furthermore, deployment scenarios with large channel delay spreads may preferably require a longer CP length than scenarios with small delay spreads. To maintain a similar CP overhead, the subcarrier spacing should be optimized depending on the delay spread. In NR, more than one value of subcarrier spacing may be supported. Therefore, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, ... are currently being considered. The symbol length T u and the subcarrier spacing Δf is given by the formula (Δf=1 / T u ) As in LTE systems, the term "resource element" can be used to denote the smallest resource unit consisting of one subcarrier for the length of one OFDM / SC-FDMA symbol.

[0017] In the new wireless system 5G-NR, for each numerology and carrier, a resource grid of subcarriers and OFDM symbols is defined for both the uplink and the downlink. Each element in 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).

[0018] In NR, a resource block (RB) is defined as 12 consecutive subcarriers in the frequency domain. Resource blocks are numbered from zero in the frequency domain as common resource blocks for subcarrier spacing settings. A physical resource block (PRB) is defined within a bandwidth part (a subset of consecutive common resource blocks) and is numbered for each bandwidth part.

[0019] <Split of 5G NR functions between NG-RAN and 5GC> Figure 2 shows the split of functions between NG-RAN and 5GC. The logical nodes of NG-RAN are gNB or ng-eNB (next generation eNB). The logical nodes of 5GC are AMF, UPF, and SMF.

[0020] In particular, gNB and ng-eNB handle the following main functions. - Functions of radio resource management such as radio bearer control, radio admission control, connection mobility control, and dynamic resource allocation (scheduling) to the UE in both the uplink and the downlink - IP header compression, encryption, and integrity protection of data[[ID=ID=19]] - Selection of AMF at UE attachment when the routing to AMF cannot be determined from the information provided by the UE - Routing of user plane data to the UPF - Routing of control plane information to AMF - Establishing and releasing connections - scheduling and sending of paging messages - System broadcast information (sent from AMF or OAM) (scheduling and transmission) - Configuring measurements and measurement reporting for mobility and scheduling - Transport-level packet marking in the uplink - Session Management - Network slicing support - QoS flow management and mapping to data radio bearers - Support for UEs in RRC_INACTIVE state - Non-access stratum (NAS) message delivery function - Radio Access Network Sharing - Dual Connectivity - Close interworking between NR and E-UTRA

[0021] The Access and Mobility Management Function (AMF) handles the following main functions: - Termination of Non-Access Stratum (NAS) signaling - NAS signaling security - Access Stratum (AS) security control - Core Network (CN) inter-node signaling for mobility between 3GPP access networks - Reachability for idle mode UEs (including control and execution of paging retransmissions) - Registration Area Management - Support for intra-system and inter-system mobility - Access Authentication - Access authentication, including roaming rights checks - Mobility management controls (subscriptions and policies) - Network slicing support - Selection of Session Management Function (SMF)

[0022] Furthermore, the User Plane Function (UPF) handles the following main functions: - Anchor points for intra-RAT / inter-RAT mobility (when applicable) - External PDU session points for interconnection with data networks - Packet routing and forwarding - User plane portion of packet inspection and policy rule enforcement - Traffic Usage Report - Uplink classifier to support routing of traffic flows to the data network - Branching points to support multi-homed PDU sessions - User plane QoS processing (e.g., packet filtering, gating, UL / DL rate enforcement) - Verification of uplink traffic (mapping from SDF to QoS flow) - Downlink packet buffering and downlink data notification triggering

[0023] Finally, the Session Management Function (SMF) handles the following major functions: - Session Management - UE IP address allocation and management - UP function selection and control - Configuration of traffic steering in the User Plane Function (UPF) for routing traffic to the correct destination - Policy enforcement and QoS control part - Downlink data notification

[0024] <Procedures for establishment and reconfiguration of RRC connection> Figure 3 shows the interaction between the UE, gNB, and AMF (5GC entity) in the NAS part when the UE transitions from RRC_IDLE to RRC_CONNECTED (see TS 38.300 v15.6.0).

[0025] RRC is the upper layer signaling (protocol) used for the configuration of the UE and gNB. In particular, in this transition, the AMF creates UE context data (including, for example, PDU session context, security keys, UE radio capabilities, UE security capabilities, etc.) and sends it to the gNB by means of an INITIAL CONTEXT SETUP REQUEST. Next, the gNB activates the AS security with the UE, which is performed by the gNB sending a SecurityModeCommand message to the UE and the UE responding to the gNB with a SecurityModeComplete message. Thereafter, the gNB performs reconfiguration to establish signaling radio bearer 2 (SRB2) and data radio bearer (DRB: Data Radio Bearer), which is by the gNB sending an RRCReconfiguration message to the UE and receiving RRCReconfigurationComplete from the UE in response. In the case of a signaling-only connection, since SRB2 and DRB are not established, these steps related to RRCReconfiguration are skipped. Finally, the gNB notifies the AMF by means of an INITIAL CONTEXT SETUP RESPONSE that the establishment procedure has completed.

[0026] Accordingly, the present disclosure provides a fifth generation core (5GC) entity (e.g., AMF, SMF, etc.) having, in operation, a control circuit that establishes a next generation (NG) connection with a gNodeB such that a signaling radio bearer is established between the gNodeB and a user equipment (UE), and a transmitter that, in operation, transmits an initial context setup message to the gNodeB over the NG connection. In particular, the gNodeB transmits radio resource control (RRC) signaling including a resource allocation configuration information element to the UE over the signaling radio bearer. The UE then performs uplink transmission or downlink reception based on the resource allocation configuration.

[0027] <IMT usage scenarios after 2020> Figure 4 illustrates some of the use cases for 5G NR. The 3GPP NR (3rd Generation Partnership Project New Radio) is considering three use cases envisioned for IMT-2020 to support a wide variety of services and applications. Phase 1 specifications for enhanced mobile broadband (eMBB) have been finalized. Current and future work includes standardization for ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), in addition to further extending eMBB support. Figure 4 illustrates some example IMT usage scenarios envisioned for 2020 and beyond (see, for example, Figure 2 in ITU-R M.2083).

[0028] URLLC use cases have stringent requirements for capabilities such as throughput, latency, and availability, and are envisioned as one of the enablers for future vertical applications, such as wireless control of industrial manufacturing or production processes, remote medical surgery, power distribution automation in smart grids, and transportation safety. URLLC's ultra-high reliability is supported by identifying technologies to meet the requirements set by TR 38.913. For NR URLLC in Release 15, key requirements include a user plane target latency of 0.5 ms for the uplink (UL) and 0.5 ms for the downlink (DL). A typical URLLC requirement for a single packet transmission is a block error rate (BLER) of 1E-5 for a 32-byte packet size with a 1-ms user plane latency.

[0029] From a physical layer perspective, there are several possible ways to improve reliability. The current scope for improving reliability includes defining a separate CQI table for URLLC, a more compact Downlink Control Information (DCI) format, PDCCH repetition, etc. However, as NR becomes more stable and more developed (a key requirement for NR URLLC), the scope for achieving ultra-high reliability may expand. Specific use cases for NR URLLC in Release 15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical applications.

[0030] Furthermore, technology enhancements targeted at NR URLLC target latency improvement and reliability enhancement. Technology enhancements for latency improvement include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplink, slot-level repetition of data channels, and downlink preemption. Preemption means that a transmission for which resources have already been allocated is aborted and the already allocated resources are used for another transmission requested later with smaller latency / higher priority requirements. Thus, an already granted transmission is preempted by a later transmission. Preemption applies regardless of the specific service type. For example, a transmission of service type A (URLLC) can be preempted by a transmission of service type B (e.g., eMBB). Technology enhancements for reliability improvement include dedicated CQI / MCS tables for a target BLER of 1E-5.

[0031] The mMTC (Massive Machine Type Communication) use case is characterized by a very large number of connected devices transmitting relatively small amounts of data that are generally latency sensitive. The devices need to be low cost and have extremely long battery life. From an NR perspective, utilizing very narrow bandwidth portions is one possible solution to achieve power savings from the UE perspective, enabling long battery life.

[0032] As mentioned above, it is expected that the range of reliability in NR will expand. One key requirement for all cases, especially for URLLC and mMTC, is high or ultra-high reliability. Several mechanisms can be considered to improve reliability from a radio perspective and a network perspective. In general, there are several key areas that can help improve reliability. These areas include compact control channel information, data channel / control channel repetition, and diversity related to the frequency, time, and / or spatial domains. These areas are generally applicable to reliability, regardless of the specific communication scenario.

[0033] Additional use cases with more stringent requirements are envisioned for NR URLLC, such as factory automation, transportation, and power distribution. The more stringent requirements include higher reliability (up to 10 times faster), depending on the use case. -6 level), higher availability, packet size up to 256 bytes, time synchronization on the order of a few microseconds (values range from 1 to a few microseconds depending on the frequency range), and short latency on the order of 0.5 to 1 ms (target latency for the user plane in particular is 0.5 ms).

[0034] Furthermore, for NR URLLC, several technology enhancements are possible from the perspective of the physical layer. In particular, enhancements related to the PDCCH (Physical Downlink Control Channel) include compact DCI, PDCCH repetition, and increased PDCCH monitoring. Also, enhancements related to the UCI (Uplink Control Information) include HARQ (Hybrid Automatic Repeat Request) enhancements and CSI feedback enhancements. Also, PUSCH enhancements related to minislot-level hopping and retransmission / repetition are recognized. The term "minislot" refers to a transmission time interval (TTI) that contains fewer symbols than a slot (e.g., a slot contains 14 symbols).

[0035] In slot - based scheduling or allocation, a slot corresponds to the granularity of timing for scheduling allocation (corresponding to the Transmission Time Interval (TTI)). Generally, the TTI determines the granularity of the timing of scheduling allocation. One TTI is the time interval during which a given signal is mapped to the physical layer. For example, conventionally, the length of the TTI can vary from 14 symbols (slot - based scheduling) to 2 symbols (non - slot - based scheduling). Downlink (DL) and uplink (UL) transmissions are defined to be organized into frames (10 ms in duration) composed of 10 sub - frames (1 ms in duration). In slot - based transmission, a sub - frame is further divided into slots, and the number of slots is defined by the numerology / sub - carrier spacing. The defined values range from 10 slots per frame (1 slot per sub - frame) when the sub - carrier spacing is 15 kHz to 80 slots per frame (8 slots per sub - frame) when the sub - carrier spacing is 120 kHz. The number of OFDM symbols per slot is 14 for the normal cyclic prefix and 12 for the extended cyclic prefix (see 3GPP TS 38.211 v15.3.0, "Physical Channels and Modulation", section 4.1 ("General Frame Structure"), section 4.2 ("Numerology"), section 4.3.1 ("Frames and Sub - frames"), and section 4.3.2 ("Slots"), September 2018). However, the allocation of time resources for transmission can also be non - slot - based. In particular, the TTI in non - slot - based allocation may correspond to a mini - slot rather than a slot. That is, one or more mini - slots may be allocated for the required transmission of data / control signaling. In non - slot - based allocation, the minimum length of the TTI may be, for example, one or two OFDM symbols.

[0036] <QoS Control> The 5G Quality of Service (QoS) model is based on QoS flows and supports both QoS flows that require a guaranteed flow bit rate (GBR QoS flows) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flows). Therefore, at the NAS level, QoS flows are the finest granularity of QoS differentiation in a PDU session. Within a PDU session, QoS flows are identified by a QoS Flow ID (QFI) carried in the encapsulation header over the NG-U interface.

[0037] The 5GC establishes one or more PDU sessions for each UE. The NG-RAN establishes at least one Data Radio Bearer (DRB) for each UE along with the PDU session, and can then configure additional DRBs for the QoS flows of that PDU session (as determined by the NG-RAN, e.g., as described above with reference to Figure 3). The NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS-level packet filters in the UE and 5GC associate UL and DL packets with QoS flows, and AS-level mapping rules in the UE and NG-RAN associate UL and DL QoS flows with DRBs.

[0038] Figure 5 illustrates the 5G NR non-roaming reference architecture (see Section 4.23 of TS 23.501 v16.1.0). Application Functions (AFs) (e.g., external application servers handling the 5G services exemplarily illustrated in Figure 4) interact with the 3GPP Core Network to provide services. For example, they may support application influence on traffic routing, access Network Exposure Functions (NEFs), or interact with a policy framework (see Policy Control Function (PCF)) for policy control (e.g., QoS control). Based on the operator's deployment, Application Functions (AFs) deemed trusted by the operator may be allowed to interact directly with the relevant Network Functions. Application Functions (AFs) not permitted by the operator to directly access Network Functions interact with the relevant Network Functions using an external exposure framework via the NEF.

[0039] Figure 5 shows further functional units of the 5G architecture: 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) (e.g., operator services, internet access, or third-party services). All or part of the core network functions and application services may be located and run in a cloud computing environment.

[0040] Therefore, the present disclosure provides an application server (e.g., an AF in a 5G architecture) having: a transmitter unit that, in operation, sends a request including QoS requirements for at least one of a URLLC service, an eMMB service, and an mMTC service to at least one of 5GC functions (e.g., an NEF, an AMF, an SMF, a PCF, an UPF, etc.) to establish a PDU session including a radio bearer between a gNodeB and a UE in accordance with the QoS requirements; and a control circuit that, in operation, executes the service using the established PDU session.

[0041] <Control signal> In the present disclosure, the downlink control signal (information) according to the present disclosure may be a signal (information) transmitted via a PDCCH of a physical layer, or may be a signal (information) transmitted via a MAC Control Element (CE) of a higher layer or an RRC. The downlink control signal may be a predefined signal (information).

[0042] The uplink control signal (information) according to the present disclosure may be a signal (information) transmitted via a PUCCH of a physical layer, or may be a signal (information) transmitted via a MAC CE of a higher layer or RRC. The uplink control signal may also be a predefined signal (information). The uplink control signal may be uplink control information (UCI), first-stage sidelink control information (SCI), or second-stage SCI.

[0043] <Reference signal> In this disclosure, a reference signal is a signal known to both a base station and a mobile station, and each reference signal may be referred to as a reference signal (RS) or a pilot signal. A reference signal may be any of a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a phase tracking reference signal (PTRS), a cell-specific reference signal (CRS), and a sounding reference signal (SRS).

[0044] <time interval> In the present disclosure, the time resource unit is not limited to one or a combination of a slot and a symbol, and may be a time resource unit such as a frame, a superframe, a subframe, a slot, a subslot of a time slot, a minislot, or a symbol, an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier-Frequency Division Multiplexing Access (SC-FDMA) symbol, or other time resource unit. The number of symbols included in one slot is not limited to the number of symbols exemplified in the above-mentioned embodiment, and may be other numbers of symbols.

[0045] <Frequency band> The present disclosure may apply to both licensed and unlicensed bands. Each band may include one or more component carriers. Each component carrier constitutes a time-frequency resource grid that includes resource elements, each of which is defined by a subcarrier in the frequency domain and a symbol in the time domain.

[0046] <Communication> The present disclosure can be applied to both terrestrial networks and non-terrestrial networks (NTNs) using satellites or high altitude pseudo satellites (HAPSs). The present disclosure can also be applied to networks with large cell sizes and terrestrial networks with large delays compared to the symbol length or slot length, such as ultra-wideband transmission networks.

[0047] <Downlink control channel monitoring, PDCCH, DCI> Many of the functions performed by the UE and / or relay include, for example, monitoring a downlink control channel (e.g., PDCCH) (see section 5.2.3 of 3GPP TS 38.300 v15.6.0) to receive specific control information or data intended for the UE.

[0048] Below is a non-exhaustive list of such features: - Paging message monitoring function, - System information acquisition function, - Signaling monitoring operation in discontinuous reception (DRX) function, - Inactivity monitoring operation in the discontinuous reception (DRX) function, - receiving a random access response in a random access function; - Packet Data Convergence Protocol (PDCP) layer reordering function As described above, the PDCCH is monitored by the UE to identify and receive information intended for the UE, such as control information and user traffic (e.g., DCI on the PDCCH, user data on the PDSCH indicated by the PDCCH).

[0049] Control information in the downlink (which may be referred to as downlink control information, DCI) has the same purpose in 5G NR as DCI in LTE, i.e., it is a set of special control information for scheduling, for example, a downlink data channel (e.g., PDSCH) or an uplink data channel (e.g., PUSCH).

[0050] For 5G NR, many different DCI formats have already been defined (see TS 38.212 v15.6.0, section 7.3.1).

[0051] These DCI formats represent the predetermined formats that the respective information is formed and transmitted in. In particular, DCI formats 0_1 and 1_1 are used for scheduling the PUSCH and PDSCH in one cell, respectively.

[0052] The PDCCH monitoring in each of these functions serves a specific purpose and is therefore initiated for that purpose. PDCCH monitoring is typically controlled at least based on a timer operated by the UE. The timer has the purpose of controlling PDCCH monitoring, for example, to limit the maximum length of time that the UE monitors the PDCCH. For example, the UE does not need to monitor the PDCCH indefinitely and can stop monitoring after a certain time to conserve power.

[0053] As mentioned above, one of the purposes of the DCI in the PDCCH is to dynamically schedule resources in the downlink, uplink, or sidelink. In particular, several formats of the DCI are provided to convey notification of resources allocated to a data channel for a particular user (resource allocation, RA). The resource allocation may include specifying resources in the frequency domain and / or the time domain.

[0054] <Technical terms> The following describes UEs, base stations, and procedures for new radio access technologies envisioned in 5G mobile communication systems (although these may also be used in LTE mobile communication systems). Various implementations and variations are also described. The following disclosure is facilitated by, and may be based, for example, at least in part on, the above discussion and findings.

[0055] Generally, it should be noted that many assumptions have been made herein so as to explain the principles underlying the present disclosure in a clear and understandable manner. However, it should be understood that these assumptions are merely examples made herein for illustrative purposes, are not necessarily essential to the invention, and do not limit the scope of the present disclosure. Those skilled in the art will understand that the principles described in the following disclosure and claims can be applied to different scenarios and in ways not explicitly described herein.

[0056] Furthermore, although specific terminology used in the context of new radio access technologies for upcoming communication systems has not yet been fully determined or may ultimately change, some of the terms used below, such as procedures, entities, and layers, are closely related to those used in LTE / LTE-A systems or in the current 3GPP 5G standardization. Therefore, the terminology may change in the future without affecting the functionality of the embodiments. Therefore, those skilled in the art will recognize that the embodiments and their scope of protection are not limited to the specific terminology illustratively used herein due to the absence of newer or ultimately agreed-upon terminology, but should be understood more broadly in terms of the functions and concepts underlying the functions and principles of the present disclosure. Specific examples are provided below.

[0057] <User device> A terminal, user terminal, user device, mobile station, or mobile node is referred to as user equipment (UE) in LTE and NR. User equipment may be a mobile device or communication device, such as a wireless telephone, smartphone, tablet computer, or universal serial bus (USB) stick with user equipment functionality. However, the term mobile device is not limited thereto; in general, a relay may also have such mobile device functionality or function as a relay. For example, a terminal is a physical entity (physical node) in a communication network. Furthermore, a communication device may be any machine-type communication device, such as an IoT device. A node may have several functional entities. A functional entity refers to a software or hardware module that realizes and / or provides a predetermined set of functions to the same node or other nodes or other functional entities of the network. A node may have one or more interfaces that attach the node to a communication facility or medium over which the node can communicate. Similarly, a network entity may have logical interfaces that attach the functional entity to a communication facility or medium over which the functional entity may communicate with other functional entities or corresponding nodes.

[0058] <Network Node> In the present disclosure, a base station may be, for example, a Transmission Reception Point (TRP), a cluster head, an access point, a Remote Radio Head (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver Station (BTS), a base unit, or a gateway. Also, in sidelink communication, a terminal may be used instead of a base station. The base station may be a relay device that relays communication between an upper node and a terminal. The base station may be a roadside unit. The base station may be, for example, a scheduling node or a network node that forms part of a network for providing services to terminals. In particular, the base station may provide wireless access to terminals. Communication between a communication device (e.g., a UE or a terminal) and a scheduling device (e.g., a base station) is generally standardized and may be defined by various layers, such as PHY, MAC, RRC, etc. (see also the above description). In LTE and NR, the air interface protocol stack includes a physical layer, a medium access layer (MAC), and upper layers. The control plane is provided with a higher layer protocol, the Radio Resource Control Protocol. Through RRC, base stations can control the configuration of terminals, and terminals can communicate with base stations to perform control tasks such as establishing and modifying connections and bearers, measurements, and other functions. The term used in LTE is eNB (or eNodeB), while the term currently used in 5G NR is gNB. The term base station or radio base station here refers to a physical entity in a communication network. Similar to a mobile station, a base station may have several functional entities. A functional entity refers to a software or hardware module that implements and / or provides a predetermined set of functions to the same node or other nodes or other functional entities of the network. The physical entity performs several control tasks for communication devices, including one or more of scheduling and configuration.It should be noted that base station functionality and communication device functionality may also be integrated within a single device. For example, a mobile terminal may also implement the functionality of a base station for other terminals. The term used in LTE is eNB (or eNodeB), and the term currently used in 5G NR is gNB. In particular, a base station may be a gNB in a Non-Terrestrial Network (NTN) NR system.

[0059] <Power saving> A new study item has been initiated within 3GPP to explore and evaluate the architecture of a low-power wake-up receiver (LP-WUR) and the design of a low-power wake-up signal (LP-WUS) to support the wake-up receiver. One of the goals is to achieve substantial UE power savings. The report containing this study item is available at www.3gpp.org and is proposal number RP-221271 entitled "Low-power Wake-up Signal and Receiver for NR as a Rel. 18 SI topic" at the 3GPP TSG RAN Meeting #96, held June 6-9, 2022, Hungary.

[0060] Therefore, power consumption depends on the configured wake-up period, e.g., the length of the paging cycle. To meet the above battery life requirements, a large value of the extended discontinuous reception (eDRX) cycle is expected to be used, which may result in high latency and may not be suitable for services that require both long battery life and low latency. In particular, eDRX is not suitable for use cases where latency is important.

[0061] Currently, the UE needs to wake up periodically once per DRX period, which accounts for power consumption during periods when there is no signaling or data traffic. DRX is used in RRC idle mode to monitor paging messages. Therefore, the UE does not need to monitor all PDCCH transmission opportunities, but only paging opportunities, thereby saving battery power. In connected mode, DRX allows the UE to enter a "sleep" state in which it does not need to monitor the PDCCH. The UE wakes up periodically to monitor the PDCCH or to send a scheduling request to initiate uplink data transfer. Therefore, the base station (gNB) is required to wait until the UE becomes active and transmit data after the UE becomes active. The uplink will not be delayed unless the base station sets the uplink scheduling request period according to the downlink DRX period.

[0062] The DRX period in connected mode is set by RRC. After each PDCCH reception, an inactivity timer is started. After the inactivity timer expires, there can be any period of short DRX period before the normal (long) DRX period. The active period in which the UE reads the PDCCH is called the "OnDuration" or "DRX active" state. The sleep period in which the UE does not read the PDCCH is called the "OffDuration" or "DRX inactive" state. The base station can put the UE into DRX inactive mode at any time using MAC signaling.

[0063] Since Release 16, the wake-up signal (WUS) is provided by DCI format 2_6. DCI format 2_6 has been used to wake up a UE or to inform the UE to skip PDCCH monitoring before DRX. In particular, this DCI is used to inform one or more UEs of power saving information outside of the DRX active period. The DCI is scrambled by the PS-RNTI and - a wake-up notification indicating whether the UE is going to enter a sleep state or waking up from a sleep state; - a SCell dormancy notification, which is a bitmap in which each bit corresponds to one of the SCell groups configured by the upper layer (RRC), and the MSB to LSB of the bitmap correspond to the first to last configured SCell; - A cell group indicating to which SCell the wake-up notification applies.

[0064] More specifically, DCI format 2_6 is defined in section 7.3.1.3.7 of 3GPP TS 38.212 v17.2.0. Therefore, DCI format 2_6 is used to notify one or more UEs of power saving information outside of DRX active time. Information of block number 1, block number 2, ..., block number N is transmitted by DCI format 2_6 with CRC scrambled by PS-RNTI. The starting position of the block is determined by PSPositionDCI2-6, a parameter provided by higher layers to the UE for which the block is configured. If the upper layer parameters PS-RNTI and dci-Format2-6 are configured for the UE, one block is configured for the UE by the upper layer, and the fields defined for the block are: wake-up notification (1 bit), and SCell dormancy notification (0 bit if the upper layer parameter Scell-groups-for-dormancy-outside-active-time is not configured; otherwise, a bitmap of 1, 2, 3, 4, or 5 bits determined according to the upper layer parameter Scell-groups-for-dormancy-outside-active-time, where each bit corresponds to one of the SCell groups configured by the upper layer parameter Scell-groups-for-dormancy-outside-active-time, and the MSB to LSB of the bitmap correspond to the first to last SCell groups configured). The size of DCI Format 2_6 is indicated by the upper layer parameter SizeDCI_2-6.

[0065] The UE can save power by skipping unnecessary PDCCH monitoring periods using DCI of format 2_6. Dormancy can be configured and applied for RRC CONNECTED UE.

[0066] Release 17 introduces the Paging Early Indication (PEI) design. DCI format 2_7 is used for PEI. DCI format 2_7 is used to indicate to the UE whether it needs to skip or monitor its paging occasions in each paging cycle. Therefore, the UE can achieve power savings by reducing the Synchronization Signal Block (SSB) measurements before detecting PEI compared to traditional paging detection. The PEI is configured in the SIB and can be applied to paging monitoring for UEs in both RRC CONNECTED and IDLE / INACTIVE states.

[0067] If the UE can only wake up by a trigger, such as paging, power consumption can be dramatically reduced. This can be achieved by using a wake-up signal to trigger the primary radio and a separate receiver capable of monitoring the wake-up signal with very low power consumption. The primary radio can operate for data transmission and reception and can be set to off or deep sleep unless turned on. The power consumption for monitoring the wake-up signal depends on the design of the wake-up signal and the hardware module of the wake-up receiver used to detect and process the signal.

[0068] Low-power WUS / WUR targeting low-power, small devices, including IoT use cases (industrial sensors, controllers, etc.) and wearable devices, requires careful consideration of signal design and transceiver operation. Other use cases, such as XR / smart glasses and smartphones, are not excluded.

[0069] In other words, the Release 18 LP-WUS / WUR design favors LP-WUS for a more efficient receiver structure, e.g., a separate module for LP-WUS detection with relaxed requirements on time / frequency synchronization. Previous designs were primarily DCI-based, requiring the UE to measure one or more SSBs for AGC training and time / frequency synchronization before detection. The long active time for receiving and processing SSBs is a major source of power consumption.

[0070] <Wake-up signal using muted resource element> According to one embodiment, a signal (hereinafter referred to as a Wake-Up Signal (WUS)) is provided that includes one or more muted resource elements.

[0071] A resource element is a unit of resources, such as the smallest resource unit. In NR, as described above, a resource element is defined by a subcarrier in the frequency domain and a symbol (such as an OFDM symbol) in the time domain. However, the present disclosure is not limited to the current definition of a resource element in NR. Rather, a resource element in a resource domain other than the time-frequency domain may be used.

[0072] The term "mute" means that the transmitter does not transmit power. Thus, a muted resource element is a resource element where the transmitter does not transmit power. Note that the receiver may measure some power even in a muted resource element. Such power may be caused by interference, for example.

[0073] Providing a WUS including one or more muted resource elements may provide several advantages. For example, detecting muted resources requires very low processing complexity. Therefore, the UE may be able to achieve greater power-saving gains. In some implementations, the UE may include a dedicated WUS detection module while turning off (or at least not using) the remaining modules. For example, the dedicated module may be capable of detecting muted resource elements, i.e., distinguishing muted received resource elements from unmuted resource elements. Forward error correction (FEC) decoding and possibly demodulation may not be necessary for detecting muted resource elements, so the corresponding modules may be turned off (or at least not used). In other words, a WUS signal including one or more muted resource elements is suitable for detection at the physical layer with little or no physical layer processing.

[0074] In this disclosure, UE operation that requires the UE to monitor the WUS but not other channels is referred to as low power (LP) operation. LP operation and LP-WUS differ from dormancy notification at the DCI level, in that reception of LP-WUS only requires detection of one or more muted resource elements. In contrast, DCI detection requires further physical layer processing, such as beamforming and monitoring the PDCCH by descrambling the CRC with the appropriate RNTI, in addition to demodulation and decoding. LP operation differs from DRX in that the network node (base station) cannot flexibly notify the UE to transition to inactive mode because DRX is based on a DRX period preconfigured by RRC or SIB. The possibility of doing so at the MAC level entails the complexity of processing MAC signaling at both the MAC and physical layers.

[0075] In particular, embodiments are described in which the UE monitors for a signal consisting of one or more blank and muted resource elements or symbols (LP-WUS) mapped to configured resources. In some more specific implementations, the UE may monitor for a WUS consisting of one or more sequences of muted / unmuted resource elements or symbols mapped to resource elements or symbols of configured resources. Based on information obtained by detecting the WUS, the UE may decide whether to continue receiving / transmitting signals other than the WUS. This information may include: - Detected resource locations of muted (blank) resources - Detected resource locations for unmuted (non-blank) resources The method may be based on one or more of the following:

[0076] For a WUS that contains a sequence of muted and unmuted resources, the sequence ID or index may be used to indicate some additional information. There may be several information bits modulated by the sequence.

[0077] More detailed exemplary embodiments of devices and methods for generating or detecting such LP WUS and WUS are provided below. The present disclosure provides a network node (e.g., a base station) and user equipment. The present disclosure provides a system including the network node and user equipment, and corresponding methods and programs.

[0078] An example of such a communication system is shown in Figure 6. The communication system 600 may be a wireless communication system according to 5G technical specifications, in particular an NR communication system, although the present disclosure is not limited to 3GPP NR terrestrial networks (TNs) and may also be applied to other wireless systems or cellular systems such as NTNs.

[0079] FIG. 6 illustrates a general, simplified, exemplary block diagram of a communication device 610 (exemplary herein, a UE) and a network node 660 (exemplary herein, a base station, e.g., a base station located at an LTE eNB (also known as an ng-eNB) or a 5G NR gNB). However, in general, the network node may be a terminal in the case of a sidelink connection between two terminals. Furthermore, particularly with regard to URLLC, eMBB, and mMTC use cases, the UE 610 may be a sensor device, a wearable device, or a connected car, or a controller for automated machinery in an industrial factory. The UE 610 may also function to relay between the base station and other communication devices (e.g., the present disclosure is not limited to communication “terminals” or user “terminals”).

[0080] 6, a UE 610 and a network node 660 (eNB / gNB) may communicate with each other over a (wireless) physical channel 650 using respective transceivers 620 (UE side) and 670 (network side). The network node 660 and the UE 610 together form a communication system 600. The communication system 600 may further include other entities such as those shown in FIGS. 1, 2, or 5.

[0081] As shown in FIG. 6 (left side), a UE 610 may include a transceiver 620 and a circuit (or, more specifically, a processing circuit) 630. A network node 660 may include a transceiver 670 and a (processing) circuit 680. Note that a transceiver may include and / or function as a receiver and / or a transmitter. In other words, in this disclosure, the term transceiver refers to hardware and software components that enable a communication device, or a respective base station, to transmit and / or receive wireless signals over a wireless channel. Thus, a transceiver corresponds to a receiver, a transmitter, or a combination of a receiver and a transmitter. Typically, base stations and UEs are assumed to be capable of not only receiving but also transmitting wireless signals. However, for some applications, particularly eMBB, mMTC, and URLLC (smart home, smart city, industrial automation, etc.), devices such as sensors may only receive signals. Furthermore, the term "circuit" includes processing circuits formed by one or more processors or processing units, or other hardware (FPGA, ASIC, or other components). The circuits referred to herein may form integrated circuits or may be implemented on a single chip.

[0082] The transmitter may handle the transmission and other processes related thereto, and the receiver may be responsible for the reception and other processes related thereto, such as monitoring the channel.

[0083] The circuit or processing circuit may be one or more hardware components, such as one or more processors or any LSI. Between the transceiver and the processing circuit, there is an input / output point (or node), and the processing circuit, in operation, controls the transceiver, i.e., controls the receiver and / or transmitter, and exchanges receive / transmit data. The transceiver may include a radio frequency (RF) front end, including one or more antennas, amplifiers, RF modulators / demodulators, etc., as the transmitter and receiver. The processing circuit may control the transceiver to perform control tasks, such as transmitting user data and control data provided by the processing circuit and / or receiving user data and control data that are further processed by the processing circuit. The processing circuit may also be responsible for performing other processes, such as judgment, decision, calculation, measurement, etc. For example, the circuit may perform baseband processing, including demodulation and decoding.

[0084] The UE 610 may be a UE capable of detecting the WUS described above. In particular, according to one embodiment, the UE 610 comprises a transceiver 620 configured to receive radio signals in preconfigured resources including resource elements as described below.

[0085] In addition, the UE610 - detecting the presence or absence of a pre-configured wake-up signal (WUS) in the received wireless signal, the pre-configured wake-up signal including one or more muted resource elements; - If the presence of a WUS is detected, determine that the user equipment receives a control signal different from the WUS. The circuit 630 is configured to:

[0086] The UE circuitry 630 may include corresponding WUS detection circuitry 635 for the WUS detection functionality described above.

[0087] It should be noted that detection may occur while the UE is in a low power (LP) state. The LP state means that the UE does not monitor the PDCCH and / or synchronization channels. More precisely, in some embodiments, this may mean that the UE 610 does not monitor other control or data channels other than the WUS. Determining that the UE receives a control signal different from the WUS may therefore correspond to a decision to leave the low power state.

[0088] The WUS may be preconfigured in any manner. For example, the WUS may be defined in a standard and therefore preconfigured in the UE, or configured by a network node using system information or RRC. Preconfiguration may involve a mixture of these configuration methods. For example, the format of the WUS may be defined in a standard, but the WUS opportunity may be configured in a SIB for each cell or group of UEs and / or indicated to the UE by RRC. The RRC may be used to indicate to the UE a WUS opportunity configuration dedicated to the UE. Such a WUS opportunity configuration may, for example, specify the resources on which the UE should monitor for WUS, i.e., the resources on which the UE 610 should detect the presence or absence of WUS.

[0089] Detecting a WUS may include measuring power within resource elements at predefined locations that may contain a WUS. Such predefined locations may be predefined WUS opportunities. For example, detecting may include comparing received power within a resource element and determining whether the resource element is muted based on whether the received power is lower than a predetermined threshold. The threshold may be defined by a criterion, configurable by a network node, or determined by the UE via some rule or signaled notification.

[0090] For example, the received power in one RE pre-configured to potentially contain WUS is measured. If the measurement result exceeds a threshold, the UE does not wake up. However, if the power is below the threshold, the UE wakes up. The resource element locations at which the UE measures the power and concludes whether the resource element is muted may be more than one to make WUS detection more reliable. Wakeup may be performed only if all of the measured resource elements are measured as muted. However, the present disclosure is not limited to such an approach, and in general, any number of resource elements configured to carry WUS and measured as muted may be sufficient to wake up the UE.

[0091] After detecting the presence of the WUS, the UE 610 can determine whether or when to release the LP state. In this way, the UE can adapt the timing of releasing the LP state depending on its implementation, for example, to the delay required to reactivate modules that were turned off (or unused) during the LP state for use by the UE when not in the LP state.

[0092] The network node 660 in FIG. - determining whether the user equipment (UE) receives a control signal different from a pre-configured wake-up signal (WUS); If the UE determines that it receives a control signal, it includes a WUS containing one or more muted resource elements in the radio signal. The circuit 680 is configured to:

[0093] Furthermore, the network node comprises a transceiver unit 870 configured to transmit radio signals.

[0094] The decision of whether the UE receives other signals than the WUS may be made by the network node based on traffic currently available for transmission to the UE, based on the capabilities of the UE, based on the resource management strategy of the network node, based on channel quality and interference level, etc. In other words, the network node may select the UEs to wake up and transmit the WUS accordingly.

[0095] As mentioned above, the WUS may be dedicated to a UE or may be group-wide, i.e., common to a group of UEs. Alternatively, the WUS may be common to all UEs in a cell.

[0096] For a WUS, in one implementation, the WUS includes a predefined sequence of one or more muted resource elements and one or more unmuted resource elements. Detecting a sequence with muted and unmuted resource elements can facilitate increased detection robustness compared to detecting isolated unmuted elements. Providing a sequence can also facilitate, for example, conveying information in the sequence selection and / or accommodating multiple orthogonal sequences, for example, for each UE or group of UEs, on the same resource.

[0097] Generally, the WUS sequence can be carried by each resource element in any area of the communication system. In a specific example of OFDM, the sequence may be carried by pre-set resource elements (resource elements at pre-set positions), and these resource elements do not need to be continuous in the time domain, but may be continuous. For one time-domain instance, the WUS can be defined on one or more sub-carriers, for example, on consecutive sub-carriers. The time instance here corresponds to one symbol. A symbol is the smallest time unit for carrying data, and in order to correspond to the definition of a resource element, it can be regarded as one time instance in some communication systems.

[0098] In the following, specific examples of the WUS sequence in the time domain (a) and the WUS sequence in the frequency domain (b) will be described.

[0099] <a. WUS Sequence in the Time Domain> In this specific example, the WUS includes a pre-defined sequence of muted resource elements and non-muted resource elements in the time domain of the time-frequency resource grid.

[0100] This is illustrated in Figure 7. Figure 7 shows an LP-WUS 710, whose structure consists of muted symbols, which may be represented by "0" in some symbols, and unmuted symbols, which may be represented by "1" in other symbols, forming a bit sequence "1100111010." This is illustrated at the top of Figure 7 by the horizontal axis t, which corresponds to time, and the vertical axis 720, which corresponds to the signal amplitude. Note that the amplitude of the unmuted signal (corresponding to the power at which the unmuted part of the WUS is transmitted) may be pre-configured or may be configured by signaling from the network node 660 to the UE 610. The signaling may be direct signaling of the transmitted power or signaling of the ratio between the WUS power and the power of another signal, such as a synchronization signal or reference signal, that is known (e.g., already pre-configured) at the UE and the network node. In the example of Figure 7, the sequence is conveyed in the time domain by consecutive symbols (resource elements).

[0101] In the example of Figure 7, the WUS thus includes a predefined sequence of muted and unmuted symbols in the time domain. Each of these symbols corresponds to multiple resource elements associated with the same time, and in particular, multiple subcarriers in the time-frequency resource grid of the orthogonal frequency division system. This is illustrated in the lower part of Figure 7. In particular, the lower part of Figure 7 has a horizontal time axis t and a vertical axis 730, which is the frequency axis. Thus, a "1" is represented in the time domain by an unmuted symbol 750, which corresponds to one time instance and multiple subcarriers in the time domain.

[0102] For example, the subcarriers in a symbol correspond to all subcarriers transformed by an orthogonal transform to form a symbol in the time domain. In other words, the number of subcarriers in a symbol is given by the size of the transform applied to transform the subcarriers into a time-domain symbol and the inverse transform applied to transform the time-domain symbol into subcarriers. The subcarriers may be orthogonal, as in OFDM systems. In other words, Figure 7 shows an example in which WUS is carried by a sequence of muted and unmuted OFDM symbols. Although NR is based on OFDM, this disclosure is not limited to OFDM and is applicable to other systems, such as SC-FDM and S-DCT-FDM.

[0103] Note that an unmuted symbol (e.g., an unmuted OFDM symbol) does not necessarily require all resource elements (subcarriers) to be muted. One or more of the subcarriers of the symbol may be unmuted. Even if only one subcarrier is unmuted, it is possible to detect whether the symbol is muted or unmuted. The spectral shape of the symbol (which subcarriers are muted and which are not) may be specified by a standard, set by signaling, or a combination of both.

[0104] In systems where information is carried by subcarriers that are transformed (and reverse transformed) into time-domain symbols, indicating a WUS using all subcarriers of a component carrier that belong to a time-domain symbol may offer some additional advantages. For example, at the receiver, a distinction between muted and non-muted symbols can be made without a transformation to the frequency (subcarrier) domain. In particular, a WUS can be detected particularly efficiently, i.e., with low complexity and therefore low power cost. For example, the detection may be performed by evaluating the received power per symbol in the time domain. As mentioned above, the detection may be performed by comparison with a pre-defined threshold.

[0105] While it may be advantageous to mute / unmute an entire symbol in the time domain of a component carrier, the present disclosure is not limited to such an example implementation. In such an example implementation, one WUS occupies one or more entire symbols. To improve resource utilization efficiency, the WUS can simply be multiplexed in the frequency domain with, for example, data, control information, or reference signals related to other UEs. In such a case, only one or more, but not all, of the component carrier's subcarriers are used for the WUS. In such a case, the UE may need to perform a transform to the frequency domain to extract the power level of the resource elements carrying the WUS, but no demodulation, decoding, or other processing is required, thereby saving processing complexity and power. Also, if multiplexing with other data occurs only on unmuted resources and not on muted resources, it is possible to distinguish between muted and unmuted resources and detect the WUS without performing a transform.

[0106] One advantage of detecting a sequence of muted / unmuted resource elements is that some additional information can be embedded in the sequence.

[0107] The UE monitors preconfigured resources to monitor for the occurrence of WUS. For example, the UE determines whether to start receiving other signals (e.g., SSB and PDCCH) based on information from LP-WUS detection. The information obtained by the detection may be resource positions of "0" bits and / or non-"0" bits (muted resource elements or symbols and / or unmuted resource elements or symbols). Whether the UE detects only muted resource element positions, only unmuted resource element positions, or both may be left to the UE implementation. For greater robustness, WUS sequence detection may include correlation between the preconfigured WUS sequence and the received signal (the signal received at the preconfigured resource elements or symbols where WUS is monitored).

[0108] For example, if the presence of a WUS is positively confirmed by detecting all or most of the muted resource elements in the expected locations using system resources, the UE may, for example, begin receiving signals other than the WUS, i.e., begin monitoring other synchronization or control resources other than the WUS opportunities. For example, after the presence of a WUS is positively detected by the UE, the next step may be monitoring the SSB and / or PDCCH.

[0109] The WUS sequence may also carry additional information, such as the ID of the detected sequence, or the bits allocated to the sequence or each muted / unmuted level. For example, different UEs may use different sequences. The information carried by the WUS sequence may be some control information, as will be explained in more detail later.

[0110] Some of the advantages of signaling WUS in the time domain sequence are that the receiving UE can achieve power saving by detecting the 0 position / non-0 position through energy detection and / or low-complexity sequence correlation in the time domain. This is suitable for low-power receiver designs with a structure that supports a dedicated module for LP-WUS detection.

[0111] <b. WUS Sequence in the Frequency Domain> In a specific example, WUS includes a predefined sequence of muted resource elements and non-muted resource elements in the frequency domain of the time-frequency resource grid.

[0112] This is shown in FIG. 8. In particular, FIG. 8 shows a horizontal frequency axis where subcarriers are indicated by solid or dashed lines. In the example of FIG. 8, all subcarriers are within the same symbol, that is, associated with the same time instance. The solid line indicates a non-muted resource element (subcarrier where a non-zero signal is transmitted), and the dashed line indicates a muted resource element (subcarrier where a zero signal is transmitted). In this example, the muted resource elements and non-muted resource elements (continuous in the frequency domain) form one or more WUS sequences.

[0113] In this example, the WUS sequence (or sequences) are mapped to muted and unmuted resource elements in the frequency domain rather than the time domain, but the UE behavior may be similar to that described above for the WUS sequence in the time domain. For example, the UE determines whether to start receiving other signals (e.g., SSB and PDCCH) based on information from the LP-WUS detection. The information from the detection may be the presence or absence of the WUS sequence, which may be detected by detecting resource positions of "0" bits and / or non-"0" bits, e.g., comb positions corresponding to muted and unmuted subcarriers. Some UEs may detect the WUS sequence only by detecting the presence or absence of power (energy) in subcarriers of WUS opportunities. Some UEs may correlate the detected power (energy) in subcarriers of received symbols for the WUS sequence with a preconfigured WUS sequence. The detected WUS sequence may carry information such as the sequence ID or modulation bits (bits modulated by the WUS sequence) of the WUS sequence in the time domain, as described above. The locations of the muted and non-muted resource elements in the frequency domain may be defined in the standard and / or pre-configured by signaling from the network node to the UE (e.g., per RRC or system information). The WUS sequence may be common to all UEs in a cell, common to a group of UEs, or UE-specific.

[0114] Frequency-domain muting can reduce inter-symbol interference and improve coverage performance, which can also relax the time synchronization requirements of the receiver and potentially benefit low-power receiver designs by supporting a dedicated module for LP-WUS detection.

[0115] The above examples described with reference to Figures 7 and 8 are not intended to limit the present disclosure. It should be noted that, in general, it is not necessary to provide a continuous WUS in the time and / or frequency domain. The WUS may be carried in resource elements scattered across the time-frequency resources of a component carrier.

[0116] Regardless of whether the WUS sequence is located in the time domain and / or the frequency domain, as mentioned above, the WUS sequence can be used to convey some information. In some exemplary embodiments, such information is modulated into the muted / unmuted elements, e.g., muted elements correspond to bit "0" and unmuted elements correspond to bit "1", or vice versa, or otherwise. However, information can also be conveyed by the identity of the sequence.

[0117] For example, the predefined sequence is one of a plurality of predefined sequences corresponding to the WUS, each of which is associated with a respective content of the control information.

[0118] For example, each of the multiple sequences may be associated with a sequence identifier (Sequence ID). One Sequence ID may be assigned to a first UE, another Sequence ID may be assigned to a second UE, and so on. In other words, by using a WUS sequence with a particular Sequence ID, each UE assigned the Sequence ID can detect the presence of the sequence and determine to wake up accordingly. Other UEs, if assigned a different sequence, will detect the absence of their assigned sequence and will not wake up.

[0119] In one example embodiment, the multiple sequences are mutually orthogonal sequences. In such a case, they may be transmitted on the same resource (e.g., symbols and / or subcarriers). For example, three different mutually orthogonal WUS sequences may be transmitted on the same resource element to three different UEs to wake them up. Each UE may detect whether its assigned WUS sequence is present in a resource element by correlating the assigned WUS sequence with the power (energy) received on the resource element. The multiple sequences used to indicate WUS to one or more UEs may be a subset of all possible mutually orthogonal sequences.

[0120] It should be noted that a WUS sequence (WUS sequence ID) does not need to be assigned to each UE as described above. In some exemplary embodiments, a WUS sequence is assigned to a cell or a group of UEs. In other words, there may be an association between a WUS sequence (WUS sequence ID) and a cell ID, or there may be an association between a WUS sequence (WUS sequence ID) and a group ID. The group ID identifies a particular group of UEs.

[0121] This association of a particular WUS sequence with a UE ID or cell ID or group ID means that the WUS sequence carries control information, i.e., information corresponding to the UE ID, cell ID, or group ID, although the present disclosure is not limited to this control information.

[0122] Rather, in addition to or instead of the UE ID and / or cell ID and / or group ID, the WUS sequence - the offset before the user equipment monitors signals other than WUS, and - the user equipment starts monitoring the system synchronization signal and / or the Physical Downlink Control Channel (PDCCH); may be used to indicate either or both of the following:

[0123] For example, a first specific sequence may indicate that the UE monitors SSBs, a second specific sequence may indicate that the UE monitors PDCCHs, and a third specific sequence may indicate that the UE monitors both SSBs and PDCCHs. If the sequences are orthogonal, the third specific sequence is not necessary and can be similarly indicated by transmitting both the first and second sequences at the same time. This is just one possible example. In another example, there may be one specific sequence signaling that the UE detects both SSBs and PDCCHs, and no sequence that allows for differentiation between SSB detection and PDCCH detection.

[0124] The offset may be an offset in the time domain. It may be specified in any suitable unit, such as the number of symbols, the number of slots, the number of subframes, etc. It may also indicate a frequency resource where other signals are expected. The frequency resource may indicate any bandwidth portion, such as a carrier, a subcarrier, etc.

[0125] Further or alternative control information may be included. Note that the WUS sequence need not carry any additional information and may simply be used to detect whether to wake up or not.

[0126] One or more muted resource elements corresponding to a WUS or a WUS sequence may be configured by a message received by the user equipment in system information or within a Radio Resource Control (RRC) protocol message. For example, a WUS configuration common to all UEs in a cell or a group of UEs may be signaled in system information (e.g., one of the System Information Blocks (SIBs)). UE-specific WUS configuration may be signaled to the UE via an RRC protocol message. However, the RRC message may also include a cell-wide or group-wide WUS configuration. The WUS configuration may include a configuration of WUS opportunities. For example, it may include which resource elements the UE should detect for the presence or absence of WUS. This may be done by specifying a periodic time interval during which the UE should perform WUS detection and / or by specifying the frequency resources (component carriers, cells, subcarriers, etc.) to monitor.

[0127] In the above example, the UE detects whether a preconfigured WUS is present in a preconfigured resource (resource element). If present, the UE wakes up (leaves the LP state). If not present, the UE does not wake up (does not leave the LP state). However, the present disclosure is not limited to waking up upon detecting the presence of a WUS. It is also possible to wake up upon detecting the absence of a WUS. It is also possible to wake up upon detecting a first specific WUS and not wake up upon detecting a second specific WUS. The term "specific WUS" refers to a specific, preconfigured one or more muted resource elements or a sequence of muted / unmuted resource elements, as described above.

[0128] As described above, the control signal different from the WUS may include a synchronization signal, system information, and / or a PDCCH. However, the present disclosure is not limited thereto, and the WUS may indicate that the UE monitors only specific information on the PDCCH (applying a specific subset of all configured RNTIs to DCI detection). Alternatively, the WUS may indicate that the UE transmits a specific signal, such as a sounding reference signal, a scheduling request, or the like.

[0129] In any of the above examples, the presence of an unmuted element can be used to measure interference. For example, circuit 630 can - interference measurements based on the power received at one or more muted resource elements; and / or - Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) measurements using one or more non-muted resource elements as reference signals; may be configured to perform the following.

[0130] For example, as defined in NR in Section 5.2 of 3GPP TS 38.214 (e.g., v17.2.0), particularly Section 5.2.2.4 for CSI, and Sections 5.1.3, 5.1.4, 5.1.12, or 5.1.16 of 3GPP TS 38.215 (e.g., v17.1.0), the interference measurement may be the interference portion of a Channel State Information (CSI) report or the interference portion of a Received Signal Strength Indicator (RSSI).

[0131] The above examples focus on the design and semantics of a WUS, which may enable a variety of power-efficient UE and corresponding base station implementations.

[0132] The UE 610 includes a circuit 630. The circuit 630 may include a WUS detection circuit 635, as shown in FIG. 6. This circuit can operate with lower complexity and lower power consumption. Also, in an exemplary UE implementation, the WUS detection circuit 635 may operate alone to perform WUS detection (corresponding to the LP state). The circuit 630 may include a separate control / data processing circuit 637 for implementing the physical layer, as shown in FIG. 9, and may, for example, demodulate and decode control signals and / or user data (physical layer payload). The control / data processing circuit 637 may be turned off (does not perform any processing) in the LP state. It may be switched on when a WUS is detected by the WUS detection circuit 635. The control / data processing circuit 637 is expected to have higher power consumption (and higher processing complexity) than the WUS detection circuit 635, thereby achieving power savings.

[0133] It should be noted that the LP state and WUS detection described above can coexist with any existing power-saving approach, such as DCI Format 2_6 or Format 2_7, as described above, or DRX. Notably, WUS detection is located below the physical layer. In the LP state, the PDCCH is not monitored, and therefore DCI Format 2_6 or Format 2_7 can only be monitored when not in the LP state. Unlike DRX, in the LP state, to read paging occasions, it is not necessary to monitor paging occasions, but rather to read the synchronization channel and PDCCH. In the LP state, only the WUS needs to be monitored (to detect whether or not the WUS is present). As with some embodiments, the WUS is a physical layer signal that does not need to be demodulated or at least decoded as part of baseband processing, and therefore power reduction is expected. Here, demodulation refers to demodulation of the signal in the resource element. In some embodiments, OFDM or other transform-based processing may still be performed, but as noted above, it is not required in other embodiments.

[0134] The network node 660 includes circuitry 680, which further includes a WUS generation circuit 685 configured to generate a WUS signal for one or more UEs. Note that apart from the WUS generation circuitry 685, the circuitry 680 may also include a control / data processing circuit 687, as shown in FIG. 10 , that performs physical layer processing, such as baseband processing for detecting received signals, and baseband processing (e.g., modulation and coding) for transmitting signals to one or more UEs.

[0135] It should be noted that the WUS signal may be transmitted without beamforming. Alternatively, the WUS signal may be transmitted using beamforming, e.g., carrying a beam index. In some embodiments, the WUS may be different for different radio cells, or for each UE, or for each group of UEs.

[0136] The present disclosure also provides methods corresponding to the above operations performed by the circuitry 630 and transceiver 620 of the UE, as well as methods corresponding to the above operations performed by the circuitry 680 and transceiver 670 of the network node.

[0137] For example, a method is provided that is executed in a user equipment (UE). The method includes acquiring a wireless signal. In particular, the wireless signal may be received wirelessly by a transceiver unit of the UE and provided as an input to method 1110 shown in FIG. 11 . Method 1110 monitors resources for a WUS. In particular, the monitoring includes step 1120 of detecting whether a preconfigured wake-up signal (WUS) is present in the received wireless signal. The WUS includes one or more muted resource elements. If the presence of a WUS is detected (“Yes” after branch 1130), the method includes determining that the user equipment receives a control signal different from the WUS. Following the determination, the method may include actual reception 1140 of a received control signal different from the WUS and / or transmission of a signal. The WUS may include specifications for the signal to be received / transmitted, as described above. If the absence of a WUS is detected (“No” after branch 1130), the method returns to monitoring the WUS.

[0138] Similarly, a method executed in a network node is provided. The method is shown in FIG. 12 and includes step 1210 of determining whether a user equipment (UE) receives a control signal different from a pre-configured wake-up signal (WUS). If the UE receives the control signal (determined as "Yes" in step 1210), the method further includes step 1220 of including the WUS in a radio signal, the WUS including one or more muted resource elements. The method may also include step 1230 of actually transmitting a radio signal carrying the WUS.

[0139] If the UE determines that it has not received the control signal (step 1210: No), the method returns to step 1210. Note that the method may further include transmitting 1240 a control signal to the UE following transmitting 1230 the WUS to the UE.

[0140] Two-part wake-up signaling The drawbacks of the existing power reduction mechanisms described in the "Power Saving" section may be addressed as described in the embodiment "Wake-up Signaling Using Muted Resource Elements" above and / or as described in the embodiment relating to two-part wake-up signaling described in more detail below. Some combinations of both embodiments may also be advantageous.

[0141] To provide an efficient power saving mechanism, this embodiment provides a two-part wake-up signaling in which the wake-up information WUI is included in the time domain following the WUS when the wake-up signal WUS indicates that the UE receives control data different from the WUS and the WUI. Note that the WUS in this embodiment may have the features described in the embodiment "Wake-up signal using muted resource elements", but does not necessarily have to have them. In other words, the WUS in this embodiment does not necessarily have to be a signal including one or more muted resource elements.

[0142] Adding a second part (WUI) to the wake-up signal increases the control information capacity compared to the possibility that the WUS carries additional information, while potentially preserving the power saving benefits of the UE and its compatibility with dedicated low-power receivers.

[0143] The two-part wake-up signaling is applicable to a communication system 1300 shown in Figure 13. The communication system 1300 may be a wireless communication system such as NR, similar to the communication system 600 of Figure 6. The communication system 1300 includes a UE 1310 and a network node 1360 that communicate with each other via a wireless channel 1350. The UE 1310 has a similar structure to the UE 610 described above with reference to Figure 6.

[0144] The UE 1310 differs from the UE 610, inter alia, by the inclusion of a WUS / WUI detection circuit 1335 in the circuit 1330 instead of a WUS detection circuit 635 in the circuit 630. The structure of the transceiver 1320 may be similar to the transceiver 620. In particular, the user equipment 1310 comprises a transceiver 1320 configured to receive wireless signals. Such a configuration may be achieved by the transceiver including one or more antennas, amplifiers, and baseband-to-desired carrier modulators and / or digital-to-analog converters (as in the transceiver 620). The specific hardware structure may vary depending on the specific UE implementation and the characteristics of the wireless communication system.

[0145] The UE 1310 further, during operation, - detecting the presence of a wake-up signal (WUS) in the received radio signal; - determining wake-up information from the received radio signal based on the WUS; - Based on the wake-up information, it is determined that control information other than the WUS and the wake-up information is received. The circuit 1330 includes a circuit configured to:

[0146] The circuitry 1330 may include corresponding WUS / WUI detection circuitry 1335 for detecting WUS and determining WUI as described above and determining to receive additional signals.

[0147] A UE that only monitors the WUS is considered to be in a Low Power (LP) state. When the UE begins to receive signals other than the WUS and WUI, the UE may be considered to have left the LP state. Reception of the WUI may also be considered related to the LP state.

[0148] As described for the previous embodiment, WUS detection may be performed within resources preconfigured for WUS, e.g., resources configured for the UE before the UE enters the LP state. Such resources may be periodic or regular. The LP state is a state in which the UE reads only the WUS and possibly the WUI, but not other signals, in particular the PDCCH or other types of signaling.

[0149] Examples of determining wake-up information based on a WUS from a received wireless signal include determining based on the location of the WUS and / or determining based on the content of the WUS.

[0150] Hereinafter, the WUS part of the wake-up signaling may be referred to as the first part signaling, and the WUI part of the wake-up signaling may be referred to as the second part signaling.

[0151] Network node 1360 has a similar structure to network node 660 described above with reference to Figure 6. Network node (base station) 1360 differs from network node 660 in particular by a WUS / WUI generation circuit 1385 included in circuit 1380 instead of a WUS generation circuit 685 included in circuit 680. The structure of transceiver unit 1370 may be similar to transceiver unit 670.

[0152] In particular, during operation, - determining whether the user equipment (UE) receives a pre-configured wake-up signal (WUS) and control information different from the wake-up information; - If the UE determines that it receives control information, it includes wake-up information following the WUS in the radio signal. A network node 1360 is provided that comprises a circuit 1380 .

[0153] Additionally, network node 1360 includes a transceiver 1370 that transmits wireless signals during operation. For example, when network node 1360 determines that the UE should wake up (e.g., when there is data for the UE to receive or when conditions change such that the UE should receive new configuration, synchronization, etc.), circuitry 1380 controls transceiver 1370 to generate a WUS and transmit on resources preconfigured for monitoring the WUS in the LP state. Circuitry 1380 then controls transceiver 1370 to generate a WUI and transmit on resources that may be determined based on (e.g., relative to) the location of the WUS, as described below.

[0154] On the UE side, the UE monitors preconfigured resources to find a WUS (also preconfigured). Based on the detection result of the WUS, the UE determines whether to further detect a WUI. In particular, if a WUS (indicating that the UE should wake up) is detected, the UE receives a WUI in a resource determined based on the content or location of the WUS.

[0155] The structure of WUS portion #1 may be similar to that described in the previous embodiment, i.e., the WUS may include at least one muted resource element. However, this embodiment is not limited to such a WUS structure. The WUS may be any preconfigured signal that does not necessarily have a muted portion. As mentioned above, "preconfigured" means that it is configured before the UE enters the LP state, i.e., before the UE stops receiving or monitoring control and data channels other than the WUS (and WUI). The WUS may be defined by power level and / or phase and may be mapped to multiple WUS opportunity resource elements that are not necessarily contiguous in the time and / or frequency domains. For example, the WUS may be a sequence of OFDM symbols with a preconfigured signal power level and / or shape, etc.

[0156] FIG. 16 shows an example in which determining the wake-up information (WUI) includes determining the location of a resource carrying the wake-up information based on a pre-set first offset (Offset_a) relative to the location of the WUS in the time domain.

[0157] In particular, FIG. 16 illustrates an OFDM symbol 1610 that may carry a Wake Up Signaling (WUS) (the first portion monitored in the LP state). In this example, the WUS is mapped to a sequence of OFDM symbols. However, as described above, in general, the WUS is not necessarily mapped to adjacent resource elements in the time and / or frequency domains. A resource carrying a WUI 1620 is shown after Offset_a. Note that in this example, Offset_a is measured in the time domain from the end of the WUS resource to the start of the WUI resource. However, the present disclosure is not limited to such an embodiment. In general, the first offset may be defined between the start of the WUS and the start of the WUI, or in any other manner. One advantage of defining a first offset is that it reduces signaling for locating the WUI. This advantage is maintained regardless of how the first offset is precisely defined.

[0158] The time domain interval Offset_a between the first and second parts of the wake-up signaling may be fixed (e.g. by a standard) or configurable (e.g. by higher layer signaling such as RRC or by system information (SIB)). It may be configurable per cell and common to all UEs of the cell, configurable per group of UEs of the cell, or configurable individually for each UE.

[0159] Note that WUS / WUI monitoring is not required when the UE is not in the LP state. In other words, when the UE starts monitoring other control signals (SSB, PDCCH, etc.) or receiving data signals, the UE may stop monitoring the WUS. This corresponds to leaving the LP state.

[0160] The transmit power level of the WUS and / or WUI may be adapted to the requirements of the communication system. To efficiently indicate the transmit power level, the transmit power level may be indicated as a ratio to a previously indicated power level. For example, - the ratio between the energy per resource element (RE) carrying the WUS and the energy per RE carrying a reference signal that can be used to demodulate the wake-up information; - the ratio between the energy per RE carrying reference signals that can be used to demodulate the wake-up information and the energy per RE carrying the wake-up information; One or both of these may be preset.

[0161] Here, the "ratio of X to Y" means either the ratio of X / Y or the ratio of Y / X. Energy per resource element can be abbreviated as EPRE (Energy per Resource Element) and indicates the power for one resource element (RE). It can be used for any channel (e.g., synchronization signal, reference signal, PDSCH, etc.). This value does not change depending on the system bandwidth or the number of RBs. However, the present disclosure is not limited to indicating the transmit power level in this manner. Other measures and corresponding ratios may also be used. Therefore, providing a ratio to the WUI may improve the robustness of reception of WUI reference and / or data, and possibly further signals.

[0162] Typically, SSBs are used for reference energy levels (e.g., primary and / or secondary synchronization signals in NR). However, in LP mode, a UE may not need to receive a synchronization signal.

[0163] The preconfiguration may be performed by a Radio Resource Control (RRC) protocol (a network node that sends a configuration message to the UE) or may be obtained from system information. However, in general, the ratio between the EPRE of the first part of the WUS and the DMRS EPRE of the second part of the WUS may also be a fixed value. For example, several possible ratios may be fixed in the standard, and configurability may be limited to signaling which of them should be applied. In addition to or instead of preconfiguring the power ratio in the WUS before the UE enters the LP state, it may also be signaled in the WUS. Thus, the UE can measure the power in the WUS (the first part of the WUS signaling) and then apply the preconfigured ratio to obtain the DMRS EPRE of the WUI.

[0164] The ratio of the WUI EPRE (EPRE in non-DMRS resource elements) to the WUI DMRS EPRE may be either fixed (e.g., one or more values defined by a standard) and / or configurable (e.g., by SIB or RRC). Thus, the UE may measure the WUI DMRS and apply the ratio to the reception of data. Note that these are some examples that do not limit the present disclosure. In general, other ratios may be fixed and / or pre-configured. For example, a ratio of WUS (first part wake-up signaling) and WUI information (data transmitted in the WUI rather than a reference signal such as DMRS) may be used. In the above example, a reference signal other than DMRS may be used in the ratio instead of DMRS.

[0165] Providing a two-part signal may facilitate some additional power efficiency improvements. For example, detecting the presence of WUS (first part of wake-up signaling) does not include demodulation and forward error correction (FEC) decoding of the signal in each resource element. Additionally or alternatively, determining the wake-up information (second part of wake-up signaling) includes demodulation and / or FEC decoding.

[0166] In other words, in this example, the WUS is a physical signal that can be detected by simply measuring the received power, without requiring complex baseband physical layer processing (and higher layers) such as MAC, RLC, etc. Such a WUS has the advantage of significantly simplifying processing in the UE, leading to power savings. Accordingly, a network node can easily generate and embed such a signal in pre-configured system resources to carry the WUS when waking up a UE or multiple UEs. To efficiently use transmission power, the WUS may be repeatedly transmitted in a sequence of beams with different directivities.

[0167] On the other hand, the WUI carries information (control data). To reliably and resource-efficiently transmit the control data, physical layer processing such as modulation, FEC, and beamforming may be desirable. Thus, in this example, the WUI is a potentially modulated and coded signal. Beamforming, precoding, or space-time coding may be applied to the WUI. Note that when referring to modulation and demodulation, this refers to the modulation of data mapped to one resource element (subcarrier, symbol). For example, the WUI may be modulated by BPSK, QPSK, or generally QAM of any order, or other types of modulation. Prior to modulation, the information transmitted on the WUI may be FEC coded, repeated, etc. The WUI is transmitted only when the WUS indicates that one or more UEs will leave the LP state, thereby minimizing power consumption due to physical layer processing. Providing information within the WUI expedites wakeup and allows UEs to quickly acquire synchronization and establish a connection for data transfer, if necessary. For example, when a UE detects a WUS and a subsequent WUI, the UE determines whether to receive other signals (e.g., SSB and / or PDCCH) based on the WUI payload (information carried by the WUI).

[0168] 14 and 15 show functional structures of the UE circuitry 1330 and the network node circuitry 1380. In particular, the UE circuitry 1330 includes a WUS detection circuitry 1335a and a WUI detection circuitry 1335b, which can be considered part of the WUS / WUI detection circuitry 1335 shown in FIG. 13. The WUS detection circuitry 1335a performs simple power level detection, as described above, while the WUI detection circuitry 1335b may perform at least some of the physical layer processing used for control / user data processing performed by the control / data processing circuitry 1337. The control / data processing circuitry 1337 is also part of the circuitry 1330. Note that this functional structure is exemplary. Because WUI detection may involve processing similar to that applied to user data / control data, the control / data processing circuitry 1337 may also be used for WUI processing (detection).

[0169] Correspondingly, the network node circuitry 1380 includes a WUS generation circuitry 1385a and a WUI generation circuitry 1385b, which can be considered part of the WUS / WUI generation circuitry 1385 shown in FIG. 13. The WUS generation circuitry 1385a performs generation of power levels mapped to pre-configured resource elements, as described above, while the WUI generation circuitry 1385b may perform at least some of the physical layer processing used for the control / user data processing performed by the control / data processing circuitry 1387. The control / data processing circuitry 1387 is also part of the circuitry 1380. It should be noted that this functional structure is exemplary. Since WUI generation may involve processing similar to that applied to user data generation / control data generation, the control / data processing circuitry 1387 may also be used for WUI processing (generation).

[0170] By adding a second part (WUI) to the WUS, the capacity of control information can be increased compared to providing only the WUS as described in the previous embodiment. Furthermore, the power saving benefits of the UE and the compatibility with a dedicated low-power receiver are maintained. For example, detecting a WUS requires less processing and therefore consumes less battery power. During WUS monitoring, the control / data processing circuit 1337 may be inactive or turned off. Similarly, the WUI detection circuit 1335b may be inactive or at least turned off until the presence of a WUS is confirmed (detected). As soon as a WUS is detected, the control / data processing circuit 1337 and the WUI detection circuit 1335b may be turned on again or reactivated.

[0171] FIG. 17 shows an exemplary embodiment that can be used for either the above exemplary embodiment of this embodiment (two-part wake-up signaling) or the preceding embodiment (WUS with muted resource elements).

[0172] Therefore, the wake-up information includes notification of a second offset (Offset_b) in the time domain. - the offset between the wake-up information and the resource containing the control information; - the minimum offset at which the user equipment starts monitoring resources containing control information; Show one of the following.

[0173] In other words, Offset_b can be defined as the actual offset or the minimum offset. The actual offset may be beneficial for power saving because it requires less search effort. The minimum offset may be beneficial for flexibility in requirement design and implementation.

[0174] FIG. 17 shows an exemplary WUS 1700 and a synchronization signal (SSB 1730) that follows the WUS 1700 in the time domain and represents control information. In FIG. 17, the offset is between the end of the WUS 1700 and the start of the SSB 1730. As described above, such a measurement does not need to be performed for Offset_b. Rather, it may be defined between the start or end of the WUS and the SSB, or may be defined in any other manner. Offset_b may also be defined between the WUI. However, in general, Offset_b may be defined between the WUS (or WUI) and control information. The control information may be, for example, a synchronization signal (such as a synchronization signal block (SSB)), a physical downlink control channel (PDCCH), etc.

[0175] Figure 17 is a schematic diagram, in which the WUI is not shown. For UE operation, the circuit 1330, during operation, receives control information other than the WUS and determines to receive wake-up information according to the second offset. As described above, the second offset indicates an offset between the resource containing the control information and the wake-up information, or a minimum offset at which the user equipment starts monitoring the resource containing the control information. The second offset may be fixed, preset, received in the wake-up information, or a combination thereof.

[0176] After the UE determines that it will subsequently receive another DL signal based on the received WUS, the UE may start receiving the SSB with at least a time offset (Offset_b) remaining after the WUS. However, the UE may make other decisions, such as when it is unable to start receiving the SSB and requires time due to the activation of electronic devices. In other words, some UEs may be able to wake up after waiting for a period of Offset_b after receiving the WUS.

[0177] Offset_b may be fixed or configurable (e.g., via SIB or RRC). As described for Offset_a, Offset_b may be configured per cell, per UE group, or per individual UE.

[0178] Receipt of the control information corresponds to leaving the low power operating state. However, there are cases where the UE may be considered to have already left the LP state by receiving the WUI.

[0179] By having a minimum time offset (Offset_b) between being woken up by the WUS and receiving the SSB, the UE can have enough time to turn on modules other than those dedicated to receiving the WUS, which may correspond to the startup time required to design an efficient low-power receiver that complies with the UE's capabilities.

[0180] Wake-up information (WUI) - PDCCH search space configuration (e.g., defining the resources on which the UE monitors (blindly detects) the PDCCH to receive control information such as DCI), - Discontinuous Reception (DRX) settings (e.g. DCI cycle settings and / or short / long DCI cycle settings), - Bandwidth Part (BWP) configuration (e.g., for receiving and / or transmitting control data or payload data), - beam index configuration (e.g., for receiving or transmitting control information or user data (payload)); - Channel State Information Reference Signal (CSI-RS) configuration (e.g., the location of CSI-RS in the resource and / or the transmit power level of CSI-RS; other types of reference signals can be configured by control information instead of or in addition to CSI-RS), - number of MIMO layers for transmitting and receiving data (control and / or payload); - the ratio between the energy per resource element (RE) carrying the WUS and the energy per RE carrying reference signals usable for demodulating the PDCCH, and - the ratio between the energy per RE carrying synchronization signals and the energy per RE carrying reference signals usable for demodulating the PDCCH The information may include one or more of the following:

[0181] The above control information may help the UE to quickly start transmission or reception. Note that the present disclosure is not limited to the above parameters. Some of the above parameters can be signaled by DCI (in PDCCH) or set by RRC, apart from WUI in case of wake-up from LP.

[0182] It may not be necessary to indicate all of this data in the WUI. Some configuration and further control information may be received via the PDCCH. The UE may start reading the PDCCH after Offset_c after receiving the WUS or after receiving the WUI. This is shown in FIG. 18. In FIG. 18, wake-up signaling 1800 is shown. For example, the wake-up signaling 1800 is a WUS (first part) that applies to the above-described embodiment (WUS with muted REs), but may also be applied to this embodiment. Alternatively, the wake-up signaling 1800 is a WUI (second part) that is applicable to this embodiment. As shown in FIG. 18, after receiving the wake-up signaling 1800, the UE starts receiving (monitoring) PDCCH monitoring opportunities 1840. The PDCCH monitoring opportunities (e.g., search space configuration) may be pre-configured (configured before the UE enters the LP state) or configured by the WUI.

[0183] Offset_c may be the same or different in value from Offset_b. Furthermore, instead of signaling both Offset_b and Offset_c, it is also possible to signal a single Offset_bc (the offset after which the UE begins to receive both synchronization and PDCCH). In such a case, Offset_bc may be defined as the minimum offset at which the UE begins to receive synchronization signals (e.g., SSB) and PDCCH.

[0184] Similar to Offset_b, Offset_c can be defined as an actual offset or a minimum offset. For example, after the UE determines that it subsequently receives other downlink signals (other than the WUS and WUI), it begins receiving the PDCCH with a time offset (Offset_c) at least after the WUS (or WUI). Offset_c may be fixed or configurable. The corresponding Offset_c is configured by system information (e.g., SIB) or higher layer signaling (e.g., RRC) or within the WUI or WUS. Signaling the actual offset can be beneficial for power saving because it reduces search effort. That is, the UE does not need to monitor many PDCCH opportunities. The minimum offset is beneficial for flexibility in UE implementation design and implementation. In general, a time offset between being woken up by the LP-WUS and receiving the PDCCH allows the UE to have enough time to turn on other modules other than those dedicated for the LP-WUS. This time may be required for some UEs to ramp up for a suitable low-power receiver design.

[0185] Some systems, e.g., LTE-A and NR, offer the possibility for a UE to operate on multiple component carriers, i.e., to support multi-band operation of a UE, where a component carrier can be generally understood as a carrier of a band on which, at the transmitter side, an orthogonal transform (such as an FFT for OFDM or a DFT for some systems) is performed to convert symbols carrying data in the subcarriers of the band into the time domain.

[0186] For example, for further power savings, detection of the presence of a WUS is performed on a pre-configured subset of configured system component carriers, which correspond to cells in a list of cells or PCIs (Physical Cell IDs) (as in NR).

[0187] In other words, the WUS is transmitted only on a single component carrier or on a limited set of component carriers (meaning less than all component carriers). The single carrier or carriers from the limited set may reside in different bands. These bands may correspond to different cell sizes. As a result, UEs in IDLE mode on different bands / carriers may accumulate by camping on a cell (carrier) that transmits the WUS. The cell / carrier that transmits the WUS signal may be configured by system information. In other words, the UE may determine whether a cell supports LP operation, and in particular, whether the cell transmits a WUS, by reading the cell's system information. Then, to utilize LP operation, the US may select a cell to transmit the WUS (and, for example, camp on the cell in IDLE mode) so that it can enter the LP state and monitor the WUS.

[0188] Transmitting the WUS only on a limited set of component carriers facilitates some resource savings compared to signaling the WUS in all cells. Therefore, in such cases, a larger guard band can be ensured between the WUS and other channels / signals in the resource grid. Such a larger guard band may facilitate robust detection of the WUS.

[0189] After receiving the WUS, the UE may move to a specific carrier for normal operation in the IDLE / INACTIVE (or CONNECTED) state. For example, the UE starts receiving / transmitting other signals. The specific carrier for normal operation may or may not correspond to the carrier on which the WUS was received. The specific carrier for normal operation may be pre-configured (configured before entering the LP state) or may be indicated in the WUS or WUI. The specific carrier for normal operation may be selected by the UE after wake-up based on received control information (e.g., system information or other control information).

[0190] As WUS is transmitted only on a limited subset of component carriers, relatively little overhead is required, but some complex UE behavior and specification impacts are expected.

[0191] This disclosure is not limited to cases where the WUS is transmitted on one component carrier or a limited amount of component carriers. In one example, detection of the presence of the WUS is performed on all configured system component carriers.

[0192] For this reason, the WUS is configured and transmitted for each component carrier (band). Therefore, the component carrier for WUS and the component carrier for normal operation can be the same. Therefore, there is no need for additional mobility optimization. The UE can camp on the best cell because each cell supports LP operation and transmits the WUS. Compared to the above example, a relatively narrow guard band may be reserved for the efficiency of the WUS. Therefore, although a larger control overhead is expected, the impact on UE behavior and specifications is expected to be smaller.

[0193] As mentioned above, the WUS may be implemented as a predefined sequence of resource elements (e.g., muted and unmuted). For different cells (component carriers), the WUS may be different, i.e., the WUS sequence may be associated with a cell ID (or component carrier ID).

[0194] The present disclosure provides methods corresponding to the steps (operations) previously described as being performed by a UE and / or a network node.

[0195] For example, a method is provided which is executed in a User Equipment (UE), the method being illustrated by the flowchart of FIG. - in step 1910, receiving a wireless signal; - step 1920 of detecting the presence of a Wake-Up Signal (WUS) in the received radio signal; - step 1930 of determining wake-up information (WUI) from the received wireless signal based on the WUS (e.g., if a WUS is detected ("Yes" in step 1920), a WUI is received. The WUI may be received in resources that the UE can determine based on the location and / or content of the WUS, in some examples); - Step 1940 of determining based on the wake-up information (WUI) that control information other than the WUS and the wake-up information and the WUI are received.

[0196] The method may further include the actual reception of the control information. "No" in step 1920 means that if no WUS is detected on the preconfigured resources (WUS opportunities), the UE remains in LP mode and continues to monitor only the WUS as already described for this embodiment with reference to Figures 13-18.

[0197] Figure 20 illustrates a method performed in a network node, comprising: - step 2010 of determining whether the User Equipment (UE) receives control information that is different from a preconfigured Wake-Up Signal (WUS) and different from Wake-Up Information (WUI), which corresponds to the UE waking up from the LP state; If the UE determines that it receives control information (step 2010: Yes), it performs step 2020 of including a WUS in the radio signal, and then step 2030 of including wake-up information; - transmitting radio signals (transmitting a WUS in step 2020 and a WUI in step 2030); - 2040 including the control information in a radio signal to be transmitted to the UE and transmitting the radio signal.

[0198] A "No" in step 2010 indicates that the base station (network node) returns to decision step 2010, i.e., periodically checks whether the UE (or UEs) should be woken up. A UE may be woken up, for example, if there is data to be exchanged (sent or received) for the UE. The specific reason may vary based on the implementation of network node functions such as scheduling and resource management functions.

[0199] Two embodiments have been described above, each including multiple examples of a WUS including one or more muted resource elements and two-part wake-up signaling including a WUS and a WUI.

[0200] The above-described embodiments and their respective implementation examples may be combined. Some examples of such combinations are shown below. However, the present disclosure is not limited to these combinations.

[0201] In one example, the WUS including at least one muted resource element or symbol may carry additional information. In one implementation, determining that the user equipment receives a control signal different from the WUS includes receiving, via the transceiver 620, control information (the wake-up information (WUI) described above) indicating whether and / or at which resources to receive one or more of a synchronization signal, system information, and a PDCCH on resources determined based on the location of the WUS.

[0202] In other words, after at least one blank resource element (e.g., a WUS (a WUS including a sequence of muted and non-muted elements), a WUI indicates to a UE or multiple UEs the resources on which the UE should receive an SSB, SIB, or PDCCH (or from what point in time). Note that the WUS and WUI may be common to UEs in the same cell, common to UEs outside a specified UE group, or UE-specific. However, the present disclosure is not limited by such an example. For example, the WUS may be UE-common (cell or group), while the WUI may be UE-specific (e.g., carrying a UE ID, etc.).

[0203] The resources carrying the WUI may be located within a pre-configured time domain offset relative to the location of the WUS, as described above. In general, the WUI may be designed according to any of the examples discussed in the two-part wake-up signaling embodiment.

[0204] Thus, a WUS may include one or more muted resource elements and may be followed by a WUI, for example, a WUS may include a predefined sequence of one or more muted resource elements and one or more unmuted resource elements, and at least one of the following applies:

[0205] - The WUS comprises a predefined sequence of muted and non-muted resource elements in the time domain of a time-frequency resource grid.

[0206] - The WUS includes a predefined sequence of muted and unmuted symbols in the time domain, each of which corresponds to multiple resource elements and multiple subcarriers associated with the same time in the time-frequency resource grid of the orthogonal frequency division system.

[0207] - The WUS comprises a predefined sequence of muted and non-muted resource elements in the frequency domain of a time-frequency resource grid.

[0208] The WUS and WUI may carry some additional control information, as described above. In particular, control information that may be useful for a UE to quickly start transmitting or receiving data may be distributed between the WUS and the WUI, with some of the information being carried by the WUS and some by the WUI.

[0209] <Some modified examples of the embodiment> In the examples in this specification, it has been shown that the synchronization signal is not received in the LP state, but embodiments are also possible in which the PDCCH is not monitored but the synchronization signal is monitored.

[0210] The above embodiments are readily applicable to NR, but are not limited thereto. For example, the sub-carrier spacing (SCS) used in any of the above solutions may be 3.75 kHz, 7.5 kHz, or 15 kHz, but any number relative to other time / frequency resources may be used without restriction.

[0211] To increase the robustness of WUS detection, any of the above solutions may use repetitions of the same signal / sequence. For example, the WUS may contain one or more repetitions of a pre-configured sequence. The sequence may carry some additional information such as beam index, cell index, UE index, UE group index, frequency, etc. Alternatively, the information carried by the WUI may be repeated in the WUI.

[0212] The WUS sequence may be one of several orthogonal or quasi-orthogonal sequences, such as Zadoff-Chu (ZC) sequences, Golden sequences, Hadamard codes, or Walsh codes. It is advantageous for the sequence to have maximum autocorrelation at shift 0 and as low as possible (e.g., 0) correlation at any other shift.

[0213] The sequence of muted and / or unmuted resources forming the WUS may be preconfigured via SIB / RRC, calculated by the UE based on a cell ID, a beam index, or a frequency resource index (e.g., a BWP index), or may be blindly detected by the UE. For example, if the UE knows the cell ID, the UE may determine the sequence to be searched for in the preconfigured resource elements. Similarly, if the UE knows the current beam indicator and / or BWP indicator, if there is an association with the sequence, the UE may determine the sequence and check whether the sequence exists in the preconfigured resources.

[0214] If there is no explicit or any association between parameters and sequences known to the UE, the UE can blindly try sequences from a set of preconfigured sequences, i.e., check whether those sequences exist in the preconfigured WUS resources. If one of such sequences exists, it may be interpreted as a WUS, and the UE may decide to wake up. In other words, the WUS sent to the UE may be any one of a pool (set) of sequences.

[0215] By measuring the signal throughout the sequence (the non-muted portion), the UE can obtain measurements for mobility and / or radio link monitoring (e.g., Reference Signal Received Power (RSRP) and / or Reference Signal Received Quality (RSRQ)). In other words, the WUS can be used as a reference signal for several measurement purposes.

[0216] The UE may obtain interference measurements, eg, interference levels for CSI and / or RSSI for mobility, by measuring received power over blanked / muted resources.

[0217] In the solution of the present disclosure, when a UE detects a WUS and determines its next step behavior, the behavior may include transmitting other uplink signals in addition to or instead of receiving downlink signals (e.g., SSB and PDCCH), such as a sounding reference signal, a PUCCH, a PUSCH, a PRACH, etc.

[0218] Hardware and Software Implementations of the Disclosure The present disclosure can be implemented by software, hardware, or software operating in conjunction with hardware. Each functional block used in the above-described embodiments can be implemented, in whole or in part, by an LSI such as an integrated circuit. Each process described in each embodiment can be controlled, in whole or in part, by the same LSI or a combination of LSIs. The LSI can be formed as an individual chip, or a single chip can be formed to include some or all of the functional blocks. The LSI can include a data input / output unit coupled to it. Depending on the level of integration, the LSI can also be referred to as an IC (integrated circuit), system LSI, super LSI, or ultra LSI. However, the technology for implementing an integrated circuit is not limited to LSI, and can be implemented using dedicated circuits, general-purpose processors, or dedicated processors. Furthermore, FPGAs (field programmable gate arrays), which can be programmed after LSI fabrication, and reconfigurable processors, which can reconfigure the connections and settings of circuit cells arranged within the LSI, can also be used. The present disclosure can be implemented using digital or analog processing. If, as a result of advances in semiconductor technology or other derivative technologies, LSI is replaced by future integrated circuit technologies, these future integrated circuit technologies can be used to integrate functional blocks. Biotechnology can also be applied.

[0219] The present disclosure can be implemented by any kind of apparatus, device, or system having a communication capability (referred to as a communication apparatus).

[0220] A communication device may include the transceiver and processing / control circuitry described above. The transceiver may include and / or function as a receiver and a transmitter. The transceiver as a transmitter and a receiver may include an RF (radio frequency) module including an amplifier, an RF modulator / demodulator, etc., and one or more antennas.

[0221] Some non-limiting examples of such communication devices include telephones (e.g., mobile phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices), game consoles, e-readers, telehealth / telemedicine devices, vehicles (e.g., cars, airplanes, ships) that provide communication capabilities, and various combinations thereof.

[0222] Communication devices are not limited to portable or mobile devices, but can also include any type of equipment, device, or system that is non-portable or fixed, such as smart home devices (e.g., appliances, lights, smart meters, control panels), vending machines, and any other "thing" in an "Internet of Things" (IoT) network.

[0223] Communication can include, for example, exchanging data through cellular systems, wireless LAN systems, satellite systems, etc., and various combinations thereof.

[0224] A communications device may include devices such as a controller or a sensor coupled to the communications device to perform the communications functions described in this disclosure. For example, a communications device may include a controller or a sensor that generates control or data signals used by the communications device to perform the communications functions of the communications device.

[0225] The communications apparatus may further include infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicate with or control apparatuses such as the apparatuses in the non-limiting examples above.

[0226] Furthermore, various embodiments may be implemented by software modules, which are executed by a processor or directly in hardware. A combination of software modules and hardware implementation is also possible. The software modules may be stored on any type of computer-readable storage medium. In particular, according to another implementation, a non-transitory computer-readable storage medium is provided. The storage medium stores a program that, when executed by one or more processors, causes the one or more processors to perform the steps of a method according to the present disclosure.

[0227] By way of non-limiting example, such computer-readable storage media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is referred to as a computer-readable medium, as appropriate. For example, if instructions are transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transitory media, but instead cover non-transitory tangible storage media. As used herein, a disc includes a compact disc (CD), a laser disc, an optical disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, where a "disk" typically reproduces data magnetically, while a "disc" reproduces data optically with a laser. Combinations of the above should also be included within the scope of computer-readable media.

[0228] Furthermore, it should be noted that individual features of different embodiments may be the subject of other embodiments, individually or in any combination. Those skilled in the art will appreciate that the present disclosure, as set forth in the specific embodiments, may be subject to various changes and / or modifications without departing from the concept or scope of the invention as broadly described. The embodiments described herein are therefore to be considered in all respects as illustrative and not restrictive.

[0229] Further Aspects Some aspects of the first embodiment are summarized below.

[0230] According to a first aspect, there is provided a user equipment (UE) comprising: a transceiver that, in operation, receives a wireless signal; and a circuit that, in operation, (i) detects in the received wireless signal whether a preconfigured wake-up signal (WUS) including one or more muted resource elements is present, and (ii) if the WUS is detected to be present, determines that the user equipment receives a control signal different from the WUS.

[0231] According to a second aspect provided in addition to the first aspect, the WUS includes a predefined sequence of one or more muted resource elements and one or more unmuted resource elements.

[0232] According to a third aspect provided in addition to the second aspect, the WUS includes the predefined sequence of the muted resource elements and the unmuted resource elements in the time domain of a time-frequency resource grid.

[0233] According to a fourth aspect provided in addition to any one of the second or third aspects, the WUS includes the predefined sequence of muted and unmuted symbols in the time domain, each of the symbols corresponding to multiple resource elements associated with the same time and multiple subcarriers in a time-frequency resource grid of an orthogonal frequency division system.

[0234] According to a fifth aspect provided in addition to any one of the second to fourth aspects, the WUS includes the predefined sequence of muted and unmuted resource elements in the frequency domain of a time-frequency resource grid.

[0235] According to a sixth aspect provided in addition to any one of the second to fifth aspects, the predefined sequence is one of a plurality of predefined sequences corresponding to a WUS, and each of the plurality of predefined sequences is associated with a respective content of the control information.

[0236] According to a seventh aspect provided in addition to the sixth aspect, the control information comprises: - Cell ID and - UE group ID, and - UE ID, - an offset after which the user equipment monitors signals other than the WUS; - the user equipment starts monitoring a system synchronization signal and / or a Physical Downlink Control Channel (PDCCH); Indicates one or more of the following.

[0237] According to an eighth aspect provided in addition to any one of the first to seventh aspects, the control signal different from the WUS includes a synchronization signal and / or system information and / or a PDCCH.

[0238] According to a ninth aspect, which is provided in addition to any one of the first to eighth aspects, determining that the user equipment receives a control signal different from the WUS includes receiving, via the transceiver unit, control information indicating whether and / or in which resources to receive one or more of a synchronization signal, system information, and a PDCCH, in resources determined based on the position of the WUS.

[0239] According to a tenth aspect provided in addition to the ninth aspect, the resource carrying the control information is located within a pre-configured time domain offset relative to the location of the WUS.

[0240] According to an eleventh aspect provided in addition to any one of the first to tenth aspects, the circuit, in operation, (i) measures interference based on power received in the one or more muted resource elements, and / or (ii) measures Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) using the one or more unmuted resource elements as reference signals.

[0241] According to a twelfth aspect provided in addition to any one of the first to eleventh aspects, the WUS is different in different radio cells.

[0242] According to a thirteenth aspect, there is provided a network node comprising: a circuit configured, in operation, to determine whether a user equipment (UE) receives a control signal different from a pre-configured wake-up signal (WUS), and, if it is determined that the UE receives the control signal, to include the WUS in a radio signal, the WUS including one or more muted resource elements; and a transceiver configured, in operation, to transmit the radio signal.

[0243] According to a fourteenth aspect, there is provided a method performed in a user equipment (UE), the method comprising: receiving a radio signal; detecting in the received radio signal whether a pre-configured wake-up signal (WUS) including one or more muted resource elements is present; and, if the presence of the WUS is detected, determining that the user equipment receives a control signal different from the WUS.

[0244] According to a fifteenth aspect, there is provided a method performed in a network node, determining whether a user equipment (UE) receives a control signal different from a pre-configured wake-up signal (WUS), and if it is determined that the UE receives the control signal, including the WUS in a radio signal that includes one or more muted resource elements, and transmitting the radio signal.

[0245] An integrated circuit (IC) is provided (for use in a user equipment (UE)). The IC circuit is configured to receive a wireless signal, detect in the received wireless signal whether a pre-configured wake-up signal (WUS) including one or more muted resource elements is present, and, if the WUS is detected to be present, determine that the user equipment receives a control signal different from the WUS. Note that the reception of the wireless signal can correspond to reception at an input of the IC.

[0246] Further, an IC (for a network node) is provided, the IC being configured to determine whether a user equipment (UE) receives a control signal different from a pre-configured wake-up signal (WUS), and if it is determined that the UE receives the control signal, include the WUS, including one or more muted resource elements, in a radio signal.

[0247] Some aspects of the second embodiment are summarized below. According to a first aspect, there is provided a user equipment (UE), the UE comprising: a transceiver configured to, in operation, receive wireless signals; and a circuit configured to, in operation: (i) detect the presence of a wake-up signal (WUS) in the received wireless signals; (ii) determine wake-up information from the received wireless signals based on the WUS; and (iii) determine, based on the wake-up information, to receive control information other than the WUS and the wake-up information.

[0248] According to a second aspect provided in addition to the first aspect, determining the wake-up information includes determining the location of a resource carrying the wake-up information based on a pre-set first offset in the time domain relative to the location of the WUS.

[0249] According to a third aspect provided in addition to the first or second aspect, at least one of (i) the ratio between the energy per resource element (RE) carrying the WUS and the energy per RE carrying a reference signal usable for demodulating the wake-up information, and (ii) the ratio between the energy per RE carrying the wake-up information and the energy per RE carrying a reference signal usable for demodulating the wake-up information is pre-set.

[0250] According to a fourth aspect provided in addition to the third or second aspect, the pre-configuration is performed by a Radio Resource Control (RRC) protocol or obtained from system information.

[0251] According to a fifth aspect provided in addition to any one of the first to fourth aspects, detecting the presence of a WUS does not include demodulation and forward error correction (FEC) decoding of a signal in each resource element, and / or determining the wake-up information includes demodulation FEC decoding.

[0252] According to a sixth aspect provided in addition to any one of the first to fifth aspects, the wake-up information includes notification of a second offset in the time domain, the second offset indicating one of an offset between the wake-up information and a resource including the control information or a minimum offset at which the user equipment starts monitoring a resource including the control information.

[0253] In particular, when operated, the circuit determines that control information other than the WUS and wake-up information are received according to a second offset, the second offset indicating one of (i) an offset between the wake-up information and the resource including the control information, or (ii) a minimum offset at which the user equipment starts monitoring the resource including the control information, the second offset being preset in the wake-up information or received in the wake-up information.

[0254] According to a seventh aspect provided in addition to any one of the first to sixth aspects, the control information is a System Synchronization Block (SSB) or a Physical Downlink Control Channel (PDCCH).

[0255] According to an eighth aspect provided in addition to any one of the first to seventh aspects, the wake-up information comprises: - PDCCH search space configuration, - Discontinuous Reception (DRX) setting, - Bandwidth Part (BWP) setting, - Beam index setting, - Channel State Information Reference Signal (CSI-RS) configuration, - the number of MIMO layers for transmitting and receiving data, - the ratio between the energy per resource element (RE) carrying the WUS and the energy per RE carrying reference signals usable for demodulating the PDCCH, and - the ratio between the energy per RE carrying synchronization signals and the energy per RE carrying reference signals usable for demodulating the PDCCH Contains one or more of:

[0256] According to a ninth aspect provided in addition to any one of the first to eighth aspects, the detection of the presence of a WUS is performed on a pre-configured subset of configured system component carriers.

[0257] According to a tenth aspect provided in addition to any one of the first to eighth aspects, the detection of the presence of a WUS is performed for all configured system component carriers.

[0258] According to an eleventh aspect provided in addition to any one of the first to tenth aspects, the WUS includes one or more muted resource elements.

[0259] According to a twelfth aspect provided in addition to the twelfth aspect, the WUS includes a predefined sequence of one or more muted resource elements and one or more unmuted resource elements, and at least one of the following applies: (i) the WUS includes a predefined sequence of muted resource elements and unmuted resource elements in the time domain of a time-frequency resource grid; (ii) the WUS includes a predefined sequence of muted symbols and unmuted symbols in the time domain, each of which corresponds to a plurality of resource elements associated with the same time and a plurality of subcarriers in the time-frequency resource grid of the orthogonal frequency division system; and (iii) the WUS includes a predefined sequence of muted resource elements and unmuted resource elements in the frequency domain of the time-frequency resource grid.

[0260] According to a thirteenth aspect, a network node comprises a circuit for, in operation, (i) determining whether a User Equipment (UE) receives control information different from a pre-configured Wake-Up Signal (WUS) or wake-up information, and (ii) if it is determined that the UE receives the control information, including the WUS and then the wake-up information in a radio signal; and a transceiver for, in operation, transmitting the radio signal.

[0261] According to a fourteenth aspect, there is provided a method performed in a user equipment (UE), receiving a radio signal, detecting the presence of a wake-up signal (WUS) in the received radio signal, determining wake-up information from the received radio signal based on the WUS, and determining based on the wake-up information to receive control information other than the WUS and the wake-up information.

[0262] According to a fifteenth aspect, there is provided a method performed in a network node, which determines based on the wake-up information whether the User Equipment (UE) receives control information different from a pre-configured wake-up signal (WUS) and the wake-up information, and if it is determined that the UE receives the control information, includes the WUS and then the wake-up information in a radio signal and transmits the radio signal.

[0263] According to another aspect, an integrated circuit is configured to detect the presence of a wake-up signal (WUS) in received wireless signals, (ii) determine wake-up information from the received wireless signals based on the WUS, and (iii) determine to receive control information other than the WUS and the wake-up information based on the wake-up information. Such an IC may implement the circuit 1330 of the UE described above.

[0264] According to another aspect, an integrated circuit is configured to (i) determine whether a user equipment (UE) receives control information different from a pre-configured wake-up signal (WUS) and wake-up information, and (ii) include the WUS and then the wake-up information in a wireless signal if it is determined that the UE receives the control information. The IC may implement circuit 1380 of the network node described above.

[0265] There is also provided an integrated circuit for controlling a communications device configured to perform the method according to the fifteenth aspect, and an integrated circuit for controlling a base station configured to perform the communications method according to the sixteenth aspect.

[0266] Also provided is a non-transitory medium storing program instructions for causing a processing circuit, such as a conventional processor, to execute all the steps of the above method embodiments or aspects.

Claims

1. During operation, the unit includes a transceiver that receives wireless signals, During operation, ○ In the received wireless signal, the presence of a wake-up signal (WUS) is detected, ○ Based on the WUS, wake-up information is determined from the received wireless signal. ○ Based on the wake-up information, it is determined to receive WUS and control information other than the wake-up information. Circuits and, User equipment equipped with the following features.

2. The determination of the wake-up information includes determining the location of the resource that carries the wake-up information based on a pre-set first offset in the time domain relative to the location of the WUS. The user device according to claim 1.

3. The ratio of the energy per resource element (RE) that carries the WUS to the energy per RE that carries the reference signal usable for demodulating the wake-up information, and The ratio of the energy per RE that carries the wake-up information to the energy per RE that carries the reference signal usable for demodulating the wake-up information, At least one of the following is pre-configured: The user device according to claim 1.

4. The aforementioned pre-configuration is performed by the Radio Resource Control (RRC) protocol or obtained from system information. The user device according to claim 2.

5. The detection of the presence of the WUS does not involve demodulation and forward error correction (FEC) decoding of signals in each resource element, and / or The determination of the wake-up information includes demodulation and FEC decoding. The user device according to claim 1.

6. The circuit, when operating, determines that it receives control information other than WUS and wake-up information according to a second offset, The second offset is, ○ The offset between the wake-up information and the resource containing the control information, or ○ The minimum offset at which the user device starts monitoring the resource containing the control information, Show one of them, The second offset is either pre-set in the wake-up information or received in the wake-up information. The user device according to claim 1.

7. The control information is a system synchronization block (SSB) or a physical downlink control channel (PDCCH). The user device according to claim 1.

8. The aforementioned wake-up information is, ○ PDCCH search space settings, ○ Intermittent reception (DRX) setting, ○ Bandwidth portion (BWP) settings, ○ Beam index setting, ○ Setting of Channel Status Information Reference Signal (CSI-RS), ○ Number of MIMO layers for sending and receiving data, ○ The ratio of the energy per resource element (RE) carrying the WUS to the energy per RE carrying the reference signal available for demodulation of the PDCCH, and ○ The ratio of the energy per RE carrying the synchronization signal to the energy per RE carrying the reference signal usable for demodulation of the PDCCH. Including one or more of the following: The user device according to claim 1.

9. The detection of the presence of the WUS is performed on a pre-configured subset of the configured system component carriers. The user device according to claim 1.

10. The detection of the presence of the WUS is performed on all configured system component carriers. The user device according to claim 1.

11. The WUS includes one or more muted resource elements. The user device according to claim 1.

12. The WUS includes a predefined sequence of one or more muted resource elements and one or more unmuted resource elements. ○ The WUS includes the predefined sequence of muted and unmuted resource elements in the time domain of the time-frequency resource grid. ○ The WUS includes the predefined sequence of muted and unmuted symbols in the time domain, and each of the symbols corresponds to multiple resource elements associated with the same time and multiple subcarriers in the time-frequency resource grid of the orthogonal frequency division system. ○ The WUS includes the predefined sequence of muted and unmuted resource elements in the frequency domain of the time-frequency resource grid. At least one of the following applies: The user device according to claim 11.

13. During operation, ○ Determine whether the user device (UE) receives control information that is different from both the pre-configured wake-up signal (WUS) and the wake-up information. ○ When it is determined that the UE will receive the control information, the WUS will then include a circuit that includes the wake-up information in the wireless signal, During operation, the unit transmits the wireless signal, A network node equipped with the following features.

14. The steps include receiving a wireless signal and The steps include detecting the presence of a wake-up signal (WUS) in the received wireless signal, Based on the WUS, the step of determining wake-up information from the received wireless signal, The steps include determining whether to receive WUS and control information other than wake-up information based on the wake-up information, A method that is executed on the user's equipment (UE), including the following.

15. The steps include determining whether the user device (UE) receives control information that is different from both a pre-configured wake-up signal (WUS) and wake-up information, If it is determined that the UE will receive the control information, the WUS will then include the wake-up information in the wireless signal. The steps include transmitting the aforementioned wireless signal, A method that is executed on network nodes, including [this].

16. During operation, The steps include receiving a wireless signal and The steps include detecting the presence of a wake-up signal (WUS) in the received wireless signal, Based on the WUS, the step of determining wake-up information from the received wireless signal, The steps include determining whether to receive WUS and control information other than wake-up information based on the wake-up information, An integrated circuit that causes a terminal device to execute a command.

17. During operation, The steps include determining whether the user device (UE) receives control information that is different from both a pre-configured wake-up signal (WUS) and wake-up information, If it is determined that the UE will receive the control information, the WUS will then include the wake-up information in the wireless signal. The steps include transmitting the aforementioned wireless signal, An integrated circuit that enables network nodes to execute commands.

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