Wake-up signal structure

Abstract

A communication device, a base station, and methods for the communication device and the base station are provided. The communication device includes: a transceiver that receives a wireless signal; and circuitry to detect the presence of a pre-configured wake-up signal, WUS, in the received wireless signal, where the WUS comprises one or more silent resource elements, and in the event that the presence of the WUS is detected, determine that the user equipment is to receive a control signal different from the WUS.

Description

Technical Field

[0001] The present disclosure relates to the transmission and reception of signals in a communication system. In particular, the present disclosure relates to methods and apparatus for such transmission and reception. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) works on technical specifications for the next generation of cellular technology, also known as fifth generation (5G) including the "New Radio" (NR) radio access technology (RAT), which operates in the frequency range up to 100 GHz. NR is a follower of technologies represented by Long Term Evolution (LTE) and LTE Advanced (LTE-A).

[0003] For systems like LTE, LTE-A and NR, further modifications and options may facilitate efficient operation of the communication system and specific equipment related to the system. Summary of the invention

[0004] One non-limiting and exemplary embodiment facilitates efficient low power operation of a communication device.

[0005] In an embodiment, the technology disclosed herein is characterized by a user equipment, comprising: a transceiver that receives a wireless signal; and a circuit that detects whether there is a preconfigured wake-up signal (WUS) in the received wireless signal, wherein the WUS includes one or more silent resource elements, and when the presence of the WUS is detected, determines that the user equipment is to receive a control signal different from the WUS.

[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] Additional benefits and advantages of the disclosed embodiments will become apparent from the description and drawings. Benefits and / or advantages may be obtained individually from the various embodiments and features of the description and drawings, and these embodiments and features do not need to be provided in full in order to obtain one or more such benefits and / or advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Hereinafter, exemplary embodiments are described in more detail with reference to the accompanying drawings and accompanying drawings.

[0009] Figure 1 An exemplary architecture of a 3GPP NR system is shown;

[0010] Figure 2 is a schematic diagram showing the functional division between NG-RAN and 5GC,

[0011] Figure 3is a sequence diagram of the RRC connection establishment / reconfiguration process,

[0012] Figure 4 is a schematic diagram showing usage scenarios of enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC),

[0013] Figure 5 is a block diagram illustrating an exemplary 5G system architecture for a non-roaming scenario,

[0014] Figure 6 is a block diagram illustrating a base station and a communication device in a communication system having an embodiment of a wake-up signal including one or more blank resource elements,

[0015] Figure 7 is a schematic diagram showing a wake-up signal represented by a sequence of muted and unmuted resource elements in the time domain,

[0016] Figure 8 is a schematic diagram showing a wake-up signal represented by a sequence of muted and non-muted resource elements in the frequency domain,

[0017] Fig. 9 is a block diagram showing the functional structure of a WUS detection circuit,

[0018] Fig.10 is a block diagram showing the functional structure of a WUS generation circuit;

[0019] Fig.11 is a flow chart showing the steps of a communication method for a user equipment,

[0020] Fig.12 is a flow chart showing the steps of a communication method for a network node (base station),

[0021] Fig.13 is a block diagram illustrating a base station and a communication device in a communication system for an embodiment regarding two-part wake-up signaling,

[0022] Fig.14 is a block diagram showing the functional structure of a WUS / WUI detection circuit,

[0023] Fig.15 is a block diagram showing the functional structure of a WUS / WUI generation circuit,

[0024] Fig.16 is a schematic diagram showing an offset between a wake-up signal and wake-up information,

[0025] Fig.17 is a schematic diagram showing the offset between the wake-up signal and the SSB to be received,

[0026] Fig.18 is a schematic diagram showing an offset between a wake-up signal or wake-up information and a PDCCH monitoring opportunity to be received,

[0027] Fig.19 is a flow chart showing the steps of a communication method for a user equipment;

[0028] Fig. 20 is a flow chart illustrating steps of a communication method for network nodes. DETAILED DESCRIPTION

[0029] 5G NR system architecture and protocol stack

[0030] 3GPP is already working on the next version of the 5th generation of cellular technology, or 5G for short, including the development of a new radio access technology (NR) operating in the frequency range up to 100 GHz. The first version of the 5G standard was completed at the end of 2017, which allowed trials and commercial deployment of smartphones compliant with the 5G NR standard.

[0031] The overall system architecture adopts, among other things, a NG-RAN (Next Generation Radio Access Network) including gNBs (gNodeBs), thereby providing NG-Radio Access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (Radio Resource Control, RRC) protocol terminals to the UE. The gNBs are interconnected with each other through Xn interfaces. The gNB is also connected to the NGC (Next Generation Core) through a Next Generation (NG) interface, more specifically, to the AMF (Access and Mobility Management Function) (e.g., a specific core entity that executes the AMF) through a NG-C interface, and to the UPF (User Plane Function) (e.g., a specific core entity that executes the UPF) through a NG-U interface. Figure 1 The NG-RAN architecture is shown in (see, e.g., 3GPP TS 38.300 v15.6.0, section 4).

[0032] The user plane protocol stack for NR (e.g., see 3GPP TS 38.300 Section 4.4.1) includes the PDCP (Packet Data Convergence Protocol, see TS 38.300 Section 6.4) sublayer, the RLC (Radio Link Control, see TS 38.300 Section 6.3) sublayer, and the MAC (Medium Access Control, see TS 38.300 Section 6.2) sublayer in the gNB terminated on the network side. In addition, a new access stratum (AS) sublayer (Service Data Adaptation Protocol, SDAP) is introduced on top of PDCP (e.g., see TS 38.300 Section 6.5). A control plane protocol stack is also defined for NR (e.g., see TS 38.300 Section 4.4.2). An overview of Layer 2 functionality is given in TS 38.300 Section 6. Sections 6.4, 6.3 and 6.2 of TS 38.300 list the functions of the PDCP, RLC and MAC sublayers respectively. The functions of the RRC layer are listed in subclause 7 of TS 38.300.

[0033] For example, the medium access control layer handles logical channel multiplexing, scheduling, and scheduling-related functions, including the processing of different numerologies.

[0034] The physical layer (PHY) is responsible for, for example, coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping signals to appropriate physical time-frequency resources. It also handles the mapping of transport channels to physical channels. The physical layer provides services to the MAC layer in the form of transport channels. A physical channel corresponds to a set of time-frequency resources used for the transmission of a specific transport channel, and each transport channel is mapped to a corresponding physical channel. For example, physical channels are PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) for uplink and PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel) and PBCH (Physical Broadcast Channel) for downlink.

[0035] NR use cases / deployment scenarios may include enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine type communications (mMTC) with different requirements in terms of data rate, latency and coverage. For example, eMBB is expected to support peak data rates (20 Gbps downlink, 10 Gbps uplink) and user experienced data rates that are three times higher than those provided by IMT-Advanced. On the other hand, in the case of URLLC, there is a strong demand for ultra-low latency (0.5 ms for user plane latency for UL and DL each) and high reliability (1-10 Mbps within 1 ms). -5) puts forward more stringent requirements. Finally, mMTC may preferably require high connection density (1000000 devices / km in urban environments) 2 ), large coverage in harsh environments, and extremely long battery life (15 years) for low-cost devices.

[0036] Therefore, a set of OFDM parameters (e.g., subcarrier spacing, OFDM symbol duration, cyclic prefix (CP) duration, number of symbols per scheduling interval) that is suitable for one use case may not be suitable for another use case. For example, low-latency services may preferably require shorter symbol duration (and thus larger subcarrier spacing) and / or fewer symbols per scheduling interval (also known as TTI) compared to mMTC services. In addition, deployment scenarios with large channel delay spread may preferably require longer CP duration compared to scenarios with short delay spread. The subcarrier spacing should be optimized accordingly to maintain similar CP overhead. NR can support more than one subcarrier spacing value. Accordingly, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, ... are now being considered. Symbol duration T u and the subcarrier spacing Δf by the formula Δf = 1 / T u In a similar manner as in the LTE system, the term "resource element" may be used to denote a minimum resource unit consisting of one subcarrier of one OFDM / SC-FDMA symbol length.

[0037] In the new radio system 5G-NR, for each numerology set and carrier, a resource grid of subcarriers and OFDM symbols is defined for uplink and downlink respectively. Each element in the resource grid is called a resource element and is identified based on a frequency index in the frequency domain and a symbol position in the time domain (see 3GPP TS 38.211 v15.6.0).

[0038] In NR, a resource block (RB) is defined as 12 consecutive subcarriers in the frequency domain. Resource blocks are numbered from zero upwards in the frequency domain as common resource blocks configured with subcarrier spacing. Physical resource blocks (PRBs) are defined within bandwidth parts (subsets of consecutive common resource blocks) and are numbered per bandwidth part.

[0039] 5G NR functional division between NG-RAN and 5GC

[0040] Figure 2 The functional division between NG-RAN and 5GC is shown. The NG-RAN logical node is gNB or ng-eNB (next generation eNB). 5GC has logical nodes AMF, UPF and SMF.

[0041] Specifically, gNB and ng-eNB host the following main functions:

[0042] - Functions for radio resource management, such as radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources to UEs in uplink and downlink (scheduling);

[0043] -IP header compression, encryption and integrity protection of data;

[0044] - Selection of the AMF at UE attach when the route to the AMF cannot be determined from the information provided by the UE;

[0045] - Routing user plane data towards (multiple) UPFs;

[0046] - Routing control plane information towards the AMF;

[0047] -Connection establishment and release;

[0048] - Scheduling and transmission of paging messages;

[0049] - Scheduling and transmission of system broadcast information (originating from AMF or OAM);

[0050] - Measurements and measurement reporting configuration for mobility and scheduling;

[0051] -Transport level packet marking in uplink;

[0052] -Session management;

[0053] -Support network slicing;

[0054] -QoS flow management and mapping to data radio bearers;

[0055] -Support UE in RRC_INACTIVE state;

[0056] - Distribution function for NAS (Non Access Stratum) messages;

[0057] - Radio access network sharing;

[0058] - Dual connectivity;

[0059] - Tight interworking between NR and E-UTRA.

[0060] The Access and Mobility Management Function (AMF) is responsible for the following main functions:

[0061] - Non-access stratum (NAS) signaling terminal;

[0062] -NAS signaling security;

[0063] -Access layer (AS) security control;

[0064] - Core Network (CN) inter-node signalling for mobility between 3GPP access networks;

[0065] - Idle mode UE reachability (including control and execution of paging retransmissions);

[0066] -Registration area management;

[0067] -Support intra-system mobility and inter-system mobility;

[0068] -Access authentication;

[0069] -Access rights control, including checking roaming rights;

[0070] -Mobility management control (subscription and policy);

[0071] -Support network slicing;

[0072] -Session Management Function (SMF) selection.

[0073] In addition, the User Plane Function (UPF) is responsible for the following main functions:

[0074] - Anchor point for intra-RAT / inter-RAT mobility (when applicable);

[0075] - External PDU session points interconnected with the data network;

[0076] -Packet routing and forwarding;

[0077] -Packet inspection and user plane part enforced by policy rules;

[0078] - Traffic usage report;

[0079] - Uplink classifier that supports routing traffic flows to data networks;

[0080] -Support branching points for multi-homed PDU sessions;

[0081] -QoS processing for user plane, e.g. packet filtering, gating, UL / DL rate enforcement;

[0082] - Uplink traffic verification (SDF to QoS flow mapping);

[0083] - Downlink packet buffering and downlink data notification triggering.

[0084] Finally, the Session Management Function (SMF) is responsible for the following main functions:

[0085] -Session management;

[0086] -UE IP address allocation and management;

[0087] -Selection and control of UP function;

[0088] -Configure traffic steering at the User Plane Function (UPF) to route traffic to the correct destination;

[0089] -Policy implementation and QoS control part;

[0090] - Downlink data notification.

[0091] RRC connection establishment and reconfiguration process

[0092] Figure 3 Some interactions between the UE, gNB and AMF (5GC entity) are shown in the context of the UE transitioning from RRC_IDLE to RRC_CONNECTED in the NAS part (see TS 38.300 v15.6.0).

[0093] RRC is a higher layer signaling (protocol) used for UE configuration and gNB configuration. Specifically, the transition involves the AMF preparing UE context data (including, for example, PDU session context, security keys, UE radio capabilities and UE security capabilities, etc.) and sending it to the gNB along with an "INITIAL CONTEXT SETUP REQUEST". The gNB then activates AS security with the UE, which is performed by the gNB sending a SecurityModeCommand message to the UE and by the UE responding to the gNB with a SecurityModeComplete message. Thereafter, the gNB performs a reconfiguration to establish a Signaling Radio Bearer 2 (SRB2) and (multiple) Data Radio Bearers (DRBs) by sending an RRCReconfiguration message to the UE and receiving an RRCReconfigurationComplete from the UE by the gNB in ​​response. For a signaling-only connection, the steps related to RRCReconfiguration are skipped as SRB2 and DRBs are not established. Finally, the gNB notifies the AMF of the completion of the establishment procedure using “INITIAL CONTEXT SETUP RESPONSE”.

[0094] Therefore, in the present disclosure, an entity (e.g., AMF, SMF, etc.) of a fifth generation core (5GC) is provided, which includes a control circuit for establishing a next generation (NG) connection with a gNodeB, and a transmitter for sending an initial context establishment message to the gNodeB via the NG connection to establish a signaling radio bearer between the gNodeB and a user equipment (UE). Specifically, the gNodeB sends a radio resource control (RRC) signaling containing a resource allocation configuration information element (IE) to the UE via the signaling radio bearer. Then, the UE performs uplink transmission or downlink reception based on the resource allocation configuration.

[0095] IMT use in 2020 and beyond

[0096] Figure 4 Some use cases for 5G NR are shown. In the 3rd Generation Partnership Project New Radio (3GPP NR), three use cases are being considered that have been envisioned to support a wide variety of services and applications in IMT-2020. The specifications for Phase 1 of enhanced mobile broadband (eMBB) have been completed. In addition to further extending eMBB support, current and future work will also involve the standardization of ultra-reliable low-latency communications (URLLC) and massive machine-type communications. Figure 4 Some envisaged IMT usage scenarios for 2020 and beyond are shown (see, for example, ITU-R M.20183 Figure 2 ).

[0097] URLLC use cases have stringent requirements on 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, telemedicine surgery, distribution automation in smart grids, transportation safety, etc. Ultra-reliability of URLLC is supported by identifying technologies that meet the requirements set through TR 38.913. For NR URLLC in Release 15, the key requirements include a target user plane latency of 0.5 ms for UL (uplink) and 0.5 ms for DL ​​(downlink). For a 32-byte packet size with a user plane latency of 1 ms, the general URLLC requirement for one packet transmission is a BLER (block error rate) of 1E-5

[0098] From a physical layer perspective, reliability can be improved in a number of possible ways. The current scope for improving reliability includes defining a separate CQI table for URLLC, a more compact DCI (Downlink Control Information) format, repetition of PDCCH, etc. However, as NR becomes more stable and developed (for NR URLLC key requirements), the scope for achieving ultra-reliability may widen. Specific use cases for NR URLLC in Rel.15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical applications.

[0099] In addition, the technical enhancements targeted by NR URLLC are aimed at latency improvement and reliability improvement. Technical enhancements for latency improvement include configurable parameter sets, non-slot-based scheduling with flexible mapping, ungranted (configured grant) uplink, slot-level repetition of data channels, and downlink preemption. Preemption means that the transmission for which resources have been allocated is stopped, and the allocated resources are used for another transmission that has been requested later but has lower latency / higher priority requirements. Accordingly, the already authorized transmission is preempted by the later transmission. Preemption can be applied independently of a specific service type. For example, a transmission of service type A (URLLC) can be preempted by a transmission of service type B (such as eMBB). Technical enhancements for reliability improvement include a dedicated CQI / MCS table for a target BLER of 1E-5.

[0100] The use case of mMTC (massive machine type communications) is characterized by a very large number of connected devices that typically transmit relatively small amounts of non-delay sensitive data. The devices need to be low-cost and have very long battery life. From the NR perspective, utilizing very narrow bandwidth portions is a possible solution to save power from the UE's perspective and extend battery life.

[0101] As mentioned above, the reliability range in NR is expected to become wider. A key requirement in all cases, especially necessary for URLLC and mMTC, is high reliability or ultra-reliability. Several mechanisms can be considered to improve reliability from a radio perspective and a network perspective. In general, there are several key potential areas that can help improve reliability. These areas include compact control channel information, data / control channel repetition, and diversity in the frequency, time and / or spatial domains. In general, these areas apply to reliability regardless of the specific communication scenario.

[0102] For NR URLLC, other use cases with more stringent requirements have been identified, such as factory automation, transportation industry, and power distribution. The more stringent requirements are higher reliability (up to 10 -6level), higher availability, packet sizes up to 256 bytes, time synchronization down to a few μs (where this value can be one μs or a few μs, depending on the frequency range), and short latency on the order of 0.5 to 1 ms (specifically a target user plane latency of 0.5 ms, depending on the use case).

[0103] In addition, for NR URLLC, from the physical layer perspective, several technical enhancements have been identified. These technologies include PDCCH (Physical Downlink Control Channel) enhancements related to compact DCI, PDCCH repetition, and increased PDCCH monitoring. In addition, UCI (Uplink Control Information) enhancements are related to enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback enhancements. PUSCH enhancements related to mini-slot level hopping and retransmission / repetition enhancements have also been identified. The term "mini-slot" refers to a transmission time interval (TTI) that includes a smaller number of symbols than a slot (a slot including 14 symbols).

[0104] In slot-based scheduling or allocation, the slot corresponds to the timing granularity of the scheduling allocation (Transmission Time Interval, TTI). In general, the TTI determines the timing granularity of the scheduling allocation. One TTI is the time interval during which a given signal is mapped to the physical layer. For example, traditionally, the TTI length can vary from 14 symbols (slot-based scheduling) to 2 symbols (non-slot-based scheduling). Downlink (DL) and uplink (UL) transmissions are specified to be organized into frames (10 ms duration) consisting of 10 subframes (1 ms duration). In slot-based transmission, the subframes are further divided into slots, the number of which is defined by the parameter set / subcarrier spacing. The specified values ​​range from 10 slots per frame (1 slot per subframe) for a subcarrier spacing of 15 kHz to 80 slots per frame (8 slots per subframe) for a subcarrier spacing of 120 kHz. For a normal cyclic prefix, the number of OFDM symbols per slot is 14, and for an extended cyclic prefix, the number of OFDM symbols per slot is 12 (see Section 4.1 (General frame structure), Section 4.2 (Parameter sets), Section 4.3.1 (Frames and subframes), and Section 4.3.2 (Slots) of 3GPP TS 38.211 V15.3.0, Physical Channels and Modulation, 2018-09). However, the allocation of time resources for transmission may also be non-slot based. Specifically, a TTI in a non-slot based allocation may correspond to a mini-slot instead of a slot. That is, one or more mini-slots may be allocated to the requested data / control signaling transmission. In a non-slot based allocation, the minimum length of a TTI may be, for example, 1 or 2 OFDM symbols.

[0105] QoS Control

[0106] The 5G QoS (Quality of Service) model is based on QoS flows and supports both QoS flows that require guaranteed flow bit rates (GBRQoS flows) and QoS flows that do not require guaranteed flow bit rates (non-GBRQoS flows). Therefore, at the NAS level, QoS flows are the finest QoS differentiation granularity in a PDU session. QoS flows are identified within a PDU session by a QoS flow ID (QFI) carried in the encapsulation header on the NG-U interface.

[0107] For each UE, the 5GC establishes one or more PDU Sessions. For each UE, the NG-RAN establishes at least one Data Radio Bearer (DRB) together with the PDU Session, and may subsequently configure (multiple) additional DRBs for (multiple) QoS flows of that PDU Session (when to do so is up to the NG-RAN), e.g. as referenced above Figure 3 As shown. NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS-level packet filters in the UE and in the 5GC associate UL packets and DL packets with QoS flows, while AS-level mapping rules in the UE and in the NG-RAN associate UL QoS flows and DL QoS flows with DRBs.

[0108] Figure 5 The 5G NR non-roaming reference architecture is shown (see TS 23.501 v16.1.0 Section 4.23). Application Function (AF) (e.g., in Figure 4 The external application server that hosts 5G services (described exemplarily in ) interacts with the 3GPP core network to provide services, for example, to support the influence of applications on traffic routing, access to the network exposure function (NEF), or interact with the policy framework (e.g., QoS control) for policy control (see Policy Control Function (PCF)). Based on the operator deployment, application functions that are considered to be trusted by the operator may be allowed to interact directly with related network functions. Application functions that are not allowed by the operator to directly access network functions interact with related network functions using the external exposure framework via NEF.

[0109] Figure 5 Other functional units of the 5G architecture are shown, namely, network slice selection function (NSSF), network repository function (NRF), unified data management (UDM), authentication server function (AUSF), access and mobility management function (AMF), session management function (SMF) and data network (DN) (e.g., operator service, Internet access or third-party service). All or part of the core network functions and application services can be deployed and run on a cloud computing environment.

[0110] Therefore, in the present disclosure, an application server (e.g., AF of 5G architecture) including a transmitter and a control circuit is provided, wherein the transmitter sends a request including QoS requirements for at least one of URLLC, eMBB and mMTC services to at least one function of 5GC (e.g., NEF, AMF, SMF, PCF, UPF, etc.) to establish a PDU session including a radio bearer between a gNodeB and a UE according to the QoS requirements, and the control circuit uses the established PDU session to perform the service.

[0111] Control Signal

[0112] In the present disclosure, a downlink control signal (information) related to the present disclosure may be a signal (information) transmitted through a PDCCH of a physical layer, or may be a signal (information) transmitted through a MAC control element (CE) or RRC of a higher layer. The downlink control signal may be a predefined signal (information).

[0113] The uplink control signal (information) related to the present disclosure may be a signal (information) transmitted through the PUCCH of the physical layer, or may be a signal (information) transmitted through the MAC CE or RRC of a higher layer. In addition, the uplink control signal may be a predefined signal (information). The uplink control signal may be replaced by uplink control information (UCI), first-level link control information (SCI), or second-level SCI.

[0114] Reference signal

[0115] In the present 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 sometimes referred to as a pilot signal. The reference signal may be any one of a demodulation RS (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).

[0116] Time interval

[0117] In the present disclosure, the time resource unit is not limited to one or a combination of a time slot and a symbol, and may be a time resource unit (such as a frame, a superframe, a subframe, a time slot, a time slot subslot, a microslot) or a time resource unit (such as a symbol, an orthogonal frequency division multiplexing (OFDM) symbol, a single carrier frequency division multiplexing access (SC-FDMA) symbol) or other time resource units. The number of symbols included in a time slot is not limited to any number of symbols exemplified in the above-mentioned embodiments, and may be other numbers of symbols.

[0118] frequency band

[0119] The present disclosure may be applied to any of the licensed and unlicensed frequency bands. Each frequency band may include one or more component carriers. Each component carrier constitutes a time-frequency resource grid including resource elements, each resource element being defined by a subcarrier in the frequency domain and a symbol in the time domain.

[0120] communication

[0121] The present disclosure can be applied to any network in a terrestrial network or a network other than a terrestrial network using a satellite or a high altitude pseudo satellite (HAPS) (NTN: non-terrestrial network). In addition, the present disclosure can be applied to a network with a large cell size, and a terrestrial network with a large delay compared to a symbol length or a time slot length, such as an ultra-wideband transmission network.

[0122] Downlink Control Channel Monitoring PDCCH DCI

[0123] Many functions operated by the UE involve monitoring a downlink control channel (eg, PDCCH, see 3GPP TS 38.300 v15.6.0, section 5.2.3) to receive, for example, specific control information or data destined for the UE.

[0124] A non-exhaustive list of these features is given below:

[0125] - Paging message monitoring function,

[0126] -System information acquisition function,

[0127] -Signaling monitoring operation for Discontinuous Reception (DRX) functionality,

[0128] - Inactivity monitoring operation for Discontinuous Reception (DRX) functionality,

[0129] - Random access response reception for random access functionality,

[0130] -Reordering function of Packet Data Convergence Protocol PDCP layer.

[0131] As described above, PDCCH monitoring is done by the UE in order to identify and receive information intended for the UE, such as control information and user traffic (eg, DCI on the PDCCH, and user data on the PDSCH indicated by the PDCCH).

[0132] The 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. a special set of control information for scheduling downlink data channels (e.g. PDSCH) or uplink data channels (e.g. PUSCH). In 5G NR, many different DCI formats have been defined (see TS38.212 v15.6.0 Section 7.3.1).

[0133] The DCI format indicates a predetermined format for forming and transmitting corresponding information. Specifically, DCI formats 0_1 and 1_1 are used for scheduling PUSCH and PDSCH in one cell, respectively.

[0134] The PDCCH monitoring of each of these functions serves a specific purpose and therefore starts and ends as described. PDCCH monitoring is usually controlled based on at least a timer operated by the UE. The timer has the purpose of controlling PDCCH monitoring, for example, limiting the maximum amount of time that the UE is to monitor the PDCCH. For example, the UE may not need to monitor the PDCCH indefinitely, but may stop monitoring after a period of time in order to be able to save power.

[0135] As mentioned above, one of the purposes of DCI on PDCCH is the dynamic scheduling of resources in the downlink or uplink or even the sidelink. Specifically, some formats of DCI are provided to carry an indication of the resources (resource allocation, RA) allocated to the data channel of a specific user. Resource allocation may include resource specifications in the frequency domain and / or time domain.

[0136] the term

[0137] In the following, UE, base station and process will be described for the new radio access technology envisioned for 5G mobile communication system, but the new radio access technology can also be used in LTE mobile communication system or future mobile communication system. Different implementations and variants will also be explained. The following disclosure is facilitated by the discussion and discovery as described above, and may be based on at least a portion thereof, for example.

[0138] In general, it should be noted that many assumptions have been made herein in order to be able to explain the basic principles of the present disclosure in a clear and understandable manner. However, these assumptions should be understood as examples made herein for illustrative purposes only, which are not essential to the present invention and therefore should not limit the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the following disclosure and the principles set forth in the claims can be applied to different scenarios and can be applied in ways not explicitly described herein.

[0139] In addition, some of the terms for processes, entities, layers, etc. used below are closely related to the terms used in LTE / LTE-A systems or the current 3GPP 5G standardization, even though the specific terms used in the context of new radio access technologies for the next 3GPP 5G communication system have not yet been fully determined or may eventually change. Therefore, the terms may be changed in the future without affecting the functionality of the embodiments. Therefore, the technicians realize that the embodiments and their scope of protection should not be limited to the specific terms used exemplarily herein due to the lack of updated or finally agreed terms, but should be understood more broadly in terms of the functions and concepts that form the basis of the functions and principles of the present disclosure. Specifically:

[0140] User Equipment

[0141] A terminal or user terminal or user device or mobile station or mobile node is referred to as a user equipment (UE) in LTE and NR. This can be a mobile device or communication device / equipment, such as a wireless phone, a smart phone, a tablet computer, or a USB (Universal Serial Bus) stick with the functionality of a user device. However, the term mobile device is not limited to this, and in general, a relay can also have the functionality of such a mobile device, and a mobile device can also act as a relay. For example, a terminal is a physical entity (physical node) within a communication network. In addition, a communication device can be a communication device of any machine type, such as an IoT device, etc. A node can 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 other functional entities of the same or another node or network. A node may have one or more interfaces that attach the node to a communication facility or medium through which the node can communicate. Similarly, a network entity may have a logical interface that attaches a functional entity to a communication facility or medium through which it can communicate with other functional entities or corresponding nodes.

[0142] Network Node

[0143] 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 station unit, or a gateway. In addition, in sidelink communication, a terminal may be used instead of a base station. A base station may be a relay device that relays communication between a higher node and a terminal. A base station may also be a roadside unit. A base station may be a scheduling node or a network node, for example, forming part of a network for providing services to a terminal. Specifically, a base station may provide wireless access to a terminal. Communications between a communication device (e.g., a UE or a terminal) and a scheduling device (e.g., a base station) are generally standardized and may be defined by different layers, such as PHY, MAC, RRC, etc. (see also the discussion above). In LTE and NR, the radio interface protocol stack includes a physical layer, a medium access layer (MAC), and higher layers. In the control plane, a higher layer protocol radio resource control protocol is provided. Via RRC, the base station may control the configuration of the terminal, and the terminal may communicate with the base station to perform control tasks, measurements, and other functions such as connection and bearer establishment, modification, etc. The terminology used in LTE is eNB (or eNodeB), while the terminology currently used for 5G NR is gNB. The term "base station" or "radio base station" here refers to a physical entity within a communication network. Like 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 other functional entities of the same or another node or network. The physical entity performs some control tasks regarding the communication device, including one or more of scheduling and configuration. Note that the base station function and the communication device function may also be integrated within a single device. For example, a mobile terminal may also implement the functions of a base station for other terminals. The terminology used in LTE is eNB (or eNodeB), while the terminology currently used for 5G NR is gNB. Specifically, a base station may also be a gNB in ​​a non-terrestrial network (NTN) NR system.

[0144] Power saving

[0145] A new study item has been started in 3GPP to study and evaluate the Low-Power Wake-up Receiver (LP-WUR) architecture and the wake-up signal (LP-WUS) design to support the wake-up receiver. One of the goals is to achieve significant UE power saving gains. A report capturing this study item is available at www.3gpp.org, titled “Low-power Wake-up Signaland Receiver for NR as a Rel.18 SI topic”, document number RP-221271, from 3GPP TSG RAN meeting #96, Hungary, June 6-9, 2022.

[0146] Therefore, the power consumption depends on the configured length of the wake-up period (e.g., paging cycle). In order to meet the above battery life requirements, it is expected to use an eDRX (extended discontinuous reception) cycle with a large value, resulting in high latency, which may not be suitable for such services with requirements for both long battery life and low latency. Especially for latency-critical use cases, eDRX is not suitable.

[0147] Currently, the UE needs to wake up periodically once per DRX cycle, which dominates power consumption in periods without signaling or data traffic. DRX is used in RRC idle mode when monitoring paging messages. Therefore, the UE does not have to monitor all PDCCH transmission opportunities, but only the paging opportunities, and can therefore better save battery power. In connected mode, DRX allows the UE to enter a "sleep" state during which the UE does not need to monitor the PDCCH. The UE wakes up periodically to monitor the PDCCH or send a scheduling request for initiating uplink data transmission. Therefore, the base station (gNB) needs to wait until the UE becomes active before sending data to it. The uplink is not delayed unless the base station configures an uplink scheduling request period according to the downlink DRX cycle.

[0148] The DRX cycle in connected mode is configured by RRC. An inactivity timer is started after each PDCCH reception. After the inactivity timer expires, there can be an optional period of a short DRX cycle before the regular (long) DRX cycle. The active period during which the UE reads the PDCCH is called the "OnDuration" or "DRX active" state. The sleep period during which the UE does not read the PDCCH is called the "OffDuration" or "DRX inactive" state. The base station has the possibility to send the UE to DRX inactive mode at any time by using MAC signaling.

[0149] Since Release 16, DCI format 2_6 has provided a wake-up signal (WUS). DCI format 2_6 has been used to wake up the UE or instruct the UE to skip PDCCH monitoring before DRX. Specifically, this DCI is used to notify power saving information outside the DRX active time of one or more UEs. The DCI is scrambled by the PS-RNTI and carries:

[0150] - a wake-up indication indicating whether the UE will enter a dormancy state or wake up from a dormancy state; and

[0151] - SCell dormancy indication, which is a bitmap where each bit corresponds to one of the SCell groups configured by higher layers (RRC), and the MSB to LSB of the bitmap correspond to the first to the last configured SCell group.

[0152] - It indicates which SCells the wake-up indication applies to.

[0153] In more detail, section 7.3.1.3.7 of 3GPP TS 38.212 v17.2.0 defines format 2_6. Thus, DCI format 2_6 is used to notify power saving information outside the DRX active time of one or more UEs. The following information is sent by means of DCI format 2_6 with CRC scrambled by PS-RNTI: block number 1, block number 2, ..., block number N. The starting position of the block is determined by the parameter PSPositionDCI2-6 provided by the higher layer for the UE configured with the block. If the UE is configured with the higher layer parameters PS-RNTI and dci-Format2-6, the higher layer configures a block for the UE, where the following fields are defined for the block: wake-up indication (1 bit), SCell sleep indication - if the higher layer parameter Scell-groups-for-dormancy-outside-active-time is not configured, it is 0 bit; otherwise, a 1, 2, 3, 4 or 5 bit bitmap is determined according to the higher layer parameter Scell-groups-for-dormancy-outside-active-time, where each bit corresponds to one of the (multiple) SCell groups configured by the higher layer parameter Scell-groups-for-dormancy-outside-active-time, where the MSB to LSB of the bitmap corresponds to the first to the last configured SCell group. The size of DCI format 2_6 is indicated by the higher layer parameter SizeDCI_2-6.

[0154] The UE can save power by skipping unnecessary PDCCH monitoring periods using format 2_6 DCI. Dormancy can be configured and applied to RRC connected UEs.

[0155] In Release 17, the Paging Early Indication (PEI) design was introduced. It uses DCI format 2_7. DCI format 2_7 is used to indicate whether the UE needs to skip or monitor its paging occasion in each paging cycle. Therefore, compared with traditional paging detection that may require measuring more SSBs, the UE can save power by reducing synchronization signal block (SSB) measurements before detecting PEI. PEI can be configured in the SIB and applied to paging monitoring of both RRC connected UEs and idle / inactive UEs.

[0156] If UEs can wake up only when they are triggered (e.g., paging), power consumption can be significantly reduced. This can be achieved by using a wake-up signal to trigger the main radio and a separate receiver with the ability to monitor the wake-up signal with very low power consumption. The main radio can operate for data transmission and reception, it can be turned off or set to deep sleep unless it is turned on. The power consumption of the wake-up signal monitoring depends on the wake-up signal design and the hardware modules of the wake-up receiver for signal detection and processing.

[0157] In order to target low power WUS / WUR for power sensitive small devices including IoT use cases (such as industrial sensors, controllers) and wearables, signal design and transmitter / receiver operation must be carefully considered. Other use cases such as XR / smart glasses, smartphones, etc. are not excluded.

[0158] In other words, the LP-WUS / WUR design of Release 18 targets LP-WUS, which is friendly to more efficient receiver structures, such as a separate module for LP-WUS detection with relaxed requirements for time / frequency synchronization. The conventional design is basically DCI-based, which requires the UE to first measure one or more SSBs for AGC training and time / frequency synchronization before detection. The long active time for receiving and processing SSBs is the main source of power consumption.

[0159] Using wake-up signals for silent resource elements

[0160] According to an embodiment, a signal (hereinafter referred to as a wake-up signal WUS) is provided, which includes one or more silent resource elements.

[0161] A resource element is a resource unit such as a minimum resource unit. In NR, as described above, a resource element is defined by a subcarrier in the frequency domain and a symbol in the time domain (such as an OFDM symbol). However, the present disclosure is not limited to the resource element definition as currently in NR. Instead, it may be a resource element in other resource domains besides the time-frequency domain.

[0162] The term silent means that the transmitter does not transmit any power. Therefore, silent resource elements are resource elements where the transmitter does not transmit any power. Note that at the receiver, some power may be measured even in silent resource elements. Such power may be caused, for example, by interference.

[0163] Providing a WUS including one or more silent resource elements may provide some advantages. For example, detection of silent resources requires only very low processing complexity. Therefore, the UE may be able to achieve more power saving gains. In some embodiments, 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 able to detect only silent resource elements, i.e., distinguishing silent received resource elements from non-silent resource elements. Forward error correction (FEC) decoding and possible demodulation may not be necessary for detection of silent resource elements, so that the corresponding module can be turned off (or at least does not need to be used). In other words, a WUS signal including one or more silent resource elements is suitable for being detected at the physical layer with very little physical layer processing at all.

[0164] In the present disclosure, UE operation that requires the UE to monitor WUS but not any other channels will be referred to as low power (LP) operation. LP operation and LP-WUS differ from the sleep indication at the DCI level in that reception of LP-WUS only requires detection of one or more resource elements that are silent. In contrast, DCI detection requires demodulation and decoding and possible further physical layer processing, such as beamforming or monitoring of PDCCH, (by descrambling the CRC with the appropriate RNTI). LP operation differs from DRX in that DRX is based on a pre-configured DRX cycle (via RRC or SIB), so that the network node (base station) cannot flexibly command the UE to enter an inactive mode. The possibility of doing this at the MAC layer involves the complexity of handling MAC signaling at both the MAC layer and the physical layer.

[0165] Specifically, embodiments of a UE monitoring signal (LP-WUS) will be discussed, which consists of one or more blank and silent resource elements or symbols mapped in the configured resources. In some more specific embodiments, the UE may monitor the WUS, which consists of one or more sequences of silent / unsilent resource elements or symbols mapped to resource elements or symbols in the configured resources. Based on information obtained by detecting the WUS, the UE may determine whether to continue receiving / sending (multiple) signals other than the WUS. The information may be based on one or more of the following:

[0166] - Detected resource location(s) for silent (blank) resources

[0167] - The detected resource location(s) for the unsilenced (non-blank) resources

[0168] In case of a WUS comprising a sequence of muted and unmuted resources, a sequence ID or index may be used to indicate some additional information. There may be some information bits modulated by the sequence.

[0169] More detailed exemplary embodiments of such LP WUS and devices and methods for generating or detecting WUS are provided below. The present disclosure provides a network node (eg, a base station) and a user equipment. The present disclosure also provides a system including the network node and the user equipment, and corresponding methods and programs.

[0170] Figure 6 An example of such a communication system is shown in FIG. The communication system 600 may be a wireless communication system according to the technical specifications of 5G, in particular a NR communication system. However, the present disclosure is not limited to 3GPP NR terrestrial networks (TNs), and may also be applied to NTNs or other wireless or cellular systems.

[0171] Figure 6 A general, simplified and exemplary block diagram of a communication device 610 (here exemplarily assumed to be a UE) and a network node 660 (here exemplarily assumed to be located in a base station, for example, in an LTE eNB (alternatively referred to as ng-eNB) or a gNB in ​​5G NR) is shown. However, in general, in the case of a sidelink connection between two terminals, the network node may also be a terminal. In addition, in particular for URLLC, eMBB and mMTC use cases, the UE 610 may also be a sensor device, a wearable device, or a controller of an automated machine in a connected vehicle or an industrial plant. In addition, the UE 610 may be able to act as a repeater between a base station and another communication device (e.g., the present disclosure is not limited to a communication "terminal" or a user "terminal").

[0172] like Figure 6 As shown, UE 610 and network node 660 (eNB / gNB) can communicate with each other via a (wireless) physical channel 650 using their transceivers 620 (UE side) and 670 (network side), respectively. Network node 660 and UE 610 together form a communication system 600. Communication system 600 may also include other entities, such as Figure 1 , Figure 2 or Figure 5 Those entities shown in .

[0173] like Figure 6As shown (left hand side), UE 610 may include a transceiver 620 and a circuit (or more specifically, a processing circuit) 630. Network node 660 may include a transceiver 670 and a (processing) circuit 680. A transceiver may in turn include and / or function as a receiver and / or a transmitter. In other words, in the present disclosure, the term "transceiver" is used for hardware and software components that allow a communication device or base station to send and / or receive radio signals over a wireless channel. Thus, a transceiver corresponds to a receiver, a transmitter, or a combination of a receiver and a transmitter. Generally, it is assumed that base stations and UEs are capable of sending as well as receiving radio signals. However, in particular for some applications of eMBB, mMTC, and URLLC (smart home, smart city, industrial automation, etc.), it is conceivable that a device such as a sensor only receives a signal. In addition, the term "circuit" includes a processing circuit formed by one or more processors or processing units, or other hardware such as an FPGA, ASIC, or other components. The circuits mentioned here may also form an integrated circuit or be implemented on a single chip.

[0174] The sender may be responsible for performing the sending process and other processes related thereto. The receiver may be responsible for performing the receiving process and other processes related thereto, such as monitoring a channel.

[0175] The circuit or processing circuit may be one or more hardware, such as one or more processors or any LSI. There may be an input / output point (or node) between the transceiver and the processing circuit, through which the processing circuit can control the transceiver, that is, control the receiver and / or transmitter and exchange receive / transmit data. The transceiver as a transmitter and receiver may include an RF (radio frequency) front end, which includes one or more antennas, amplifiers, RF modulators / demodulators, etc. The processing circuit may implement control tasks, such as controlling the transceiver to send user data and control data provided by the processing circuit and / or receiving user data and control data further processed by the processing circuit. The processing circuit may also be responsible for performing other processes, such as determining, deciding, calculating, measuring, etc. For example, baseband processing including demodulation and decoding may be performed by the circuit.

[0176] UE 610 may be a UE capable of detecting the above-mentioned WUS. Specifically, according to an exemplary embodiment, UE 610 includes a transceiver 620 configured to receive a wireless signal. In the pre-configured resources including the resource elements mentioned below.

[0177] Furthermore, the UE 610 comprises a circuit 630 configured to:

[0178] - detecting the presence of a preconfigured wake-up signal (WUS) in a received wireless signal, wherein the WUS includes one or more of the silent resource elements, and

[0179] - In case the presence of the WUS is detected, determining that the user equipment is to receive a control signal different from the WUS.

[0180] With respect to the above-mentioned function of detecting WUS, the circuit 630 of the UE may include a corresponding WUS detection circuit 635 .

[0181] Note that the detection may be performed 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 strictly speaking, in some embodiments, it may mean that the UE 610 does not monitor any other control or data channels other than the WUS. Thus, determining that the UE will receive a control signal different from the WUS may correspond to a decision to leave the low power state.

[0182] WUS can be preconfigured in any way. For example, WUS can be defined in the standard and therefore preconfigured at the UE, or configured by a network node using system information or using RRC. Preconfiguration can be a mixture of these configuration means. For example, the form of WUS can be defined in the standard, but the WUS timing can be configured in the SIB per cell or per UE group and / or indicated to the UE by RRC. RRC can be used to indicate the UE-specific WUS timing configuration to the UE. This WUS timing configuration specifies, for example, in which resources the UE should monitor WUS, i.e., the resources in which the UE 610 is to detect the presence or absence of WUS.

[0183] The detection of a WUS may include measuring the power within a resource element at a preconfigured location that may carry a WUS. Such a preconfigured location may be a preconfigured WUS opportunity. For example, the detection may involve comparing the power received within a resource element and deciding whether the resource element is muted based on whether the received power is below a certain threshold. The threshold may be defined by a standard, or may be configured by a network node, or determined by the UE based on some rules or signaled indications.

[0184] For example, the power received in one RE that is preconfigured to possibly carry a WUS is measured. If the measurement result exceeds a threshold, the UE should not wake up. However, if the power is less than the threshold, the UE will wake up. In order to make WUS detection more reliable, there may be more than one position of muted resource elements, and the UE is to measure the power in these positions and infer whether they are muted. Wake-up can only be performed when all measured resource elements are measured as muted. However, the present disclosure is not limited to this approach, and in general, any number of resource elements that are configured to carry a WUS and measured as muted may be sufficient to wake up the UE.

[0185] The UE 610 is able to decide whether to leave the LP state or at which time to leave the LP state after detecting the presence of the WUS. In this way, the UE can adapt the timing of leaving the LP state to its own implementation, for example, to the delay required to restart a module that has been shut down (or not yet used) during the LP state and is to be used by the UE when the UE is not in the LP state.

[0186] Figure 6 The network node 660 comprises a circuit 680 configured to:

[0187] -determining whether a user equipment (UE) is to receive a control signal different from a preconfigured wake-up signal (WUS), and

[0188] - In case it is determined that the UE is to receive the control signal, a WUS is included in the wireless signal, wherein the WUS includes one or more silent resource elements.

[0189] Furthermore, the network node comprises a transceiver 870 configured to send wireless signals.

[0190] Determining whether the UE is to receive other signals in addition to the WUS may be performed by the network node based on the services currently available for transmission to the UE, based on the UE capabilities, based on the resource management policy of the network node, based on the channel quality and interference level, etc. In other words, the network node may select the UEs to wake up and send the WUS to them accordingly.

[0191] As described above, the WUS may be specific to a UE or group-common, ie, common to a group of UEs. Alternatively, the WUS may be common to all UEs in a cell.

[0192] With respect to the WUS, in an exemplary embodiment, the WUS includes a predefined sequence of one or more silent resource elements and one or more non-silent resource elements. Detecting a sequence having silent resource elements and non-silent resource elements may facilitate increased detection robustness compared to detecting isolated non-silent elements. In addition, the provision of a sequence may allow, for example, to carry some information in the selection of a sequence and / or to accommodate multiple orthogonal sequences, for example for a corresponding UE or UE group, in the same resource.

[0193] In general, a WUS sequence may be carried by corresponding resource elements in any domain(s) of a communication system. In the specific example of OFDM, the sequence may be carried by preconfigured resource elements (resource elements in preconfigured positions), which may, but need not necessarily, be continuous in the time domain. For one time domain instance, a WUS may be defined on one or more subcarriers (e.g., consecutive subcarriers). The time instance here corresponds to a symbol - in some communication systems, a symbol may be considered a time instance as it is the smallest time unit carrying data, corresponding to a resource element definition.

[0194] In the following, specific examples of WUS sequences in the time domain (a) and WUS sequences in the frequency domain (b) are discussed.

[0195] a. WUS sequence in the time domain

[0196] In this particular example, the WUS comprises a predefined sequence of muted and non-muted resource elements in the time domain of the time-frequency resource grid.

[0197] This is Figure 7 Shown in. Figure 7 LP-WUS 710 is shown, whose structure consists of silent symbols that can be represented by "0" in some symbols and non-silent symbols that can be represented by "1" in other symbols, thereby forming a bit sequence "1100111010". This Figure 7 , where the horizontal axis t corresponds to time and the vertical axis 720 corresponds to the amplitude of the signal. Note that the amplitude of the un-muted signal (corresponding to the power of the un-muted portion of the transmitted WUS) may be pre-configured by a standard or by signaling from the network node 660 to the UE 610. The signaling may be a direct signaling of the power to be transmitted or a signaling of a ratio between the power of the WUS and the power of another signal (such as a synchronization signal or a reference signal, etc.) that is known (e.g., already pre-configured) at the UE and the network node. Figure 7 In the example of , the sequence is carried by consecutive codewords (resource elements) in the time domain.

[0198] exist Figure 7 In the example of , the WUS thus comprises a predefined sequence of silent symbols and unsilenced symbols in the time domain. Each of the symbols corresponds to a plurality of resource elements associated with the same time, and in particular to a plurality of subcarriers in the time-frequency resource grid of an orthogonal frequency division system. This Figure 7 Specifically, Figure 7 The bottom of has a horizontal time axis t and a vertical axis 730 which is a frequency axis. Thus, a "1" is represented by a non-silent symbol 750 in the time domain, which corresponds to one time instance and a number of subcarriers in the time domain.

[0199] For example, the multiple subcarriers in a symbol correspond to all those subcarriers that are transformed by an orthogonal transform to form a symbol in the time domain. In other words, the number of subcarriers of a symbol is given by the size of the transform applied to convert the multiple subcarriers into time domain symbols and the inverse transform to convert the time domain symbols into the multiple subcarriers. As in an OFDM system, the subcarriers may be orthogonal. In other words, Figure 7 An example is shown where the WUS is carried by a sequence of muted and unmuted OFDM symbols. Although NR is based on OFDM, the present disclosure is not limited to OFDM and is applicable to other systems such as SC-FDM, S-DCT-FDM, etc.

[0200] Note that a non-muted symbol (e.g., non-muted OFDM symbol) does not necessarily mean that all resource elements (subcarriers) must be non-muted. It is sufficient that one or more subcarriers of a symbol are non-muted. Even in the case where one subcarrier is non-muted, detection as to whether a symbol is muted or non-muted is possible. The spectral shape of a symbol (which subcarriers will be muted and which will not be muted) may be configurable by standard provisions or by signaling or a combination of both.

[0201] Using all subcarriers of a component carrier belonging to a time domain symbol to indicate a WUS can provide some additional advantages for systems that carry information in subcarriers that are (inversely) transformed into time domain symbols. For example, a distinction between silent symbols and non-silent symbols can be performed without having to perform a transformation to the frequency (subcarrier) domain at the receiver. In particular, WUS can be detected particularly efficiently - with low complexity and therefore low power cost. For example, the detection can be based on evaluating the received power per symbol in the time domain. As described above, the detection can be performed by comparing with a preconfigured threshold.

[0202] Although it may be advantageous to silence / unsilence an entire symbol in the time domain of a component carrier, the present disclosure is not limited to this exemplary embodiment. In this exemplary embodiment, one WUS will occupy the entire one or more symbols. In order to improve the efficiency of resource utilization, the WUS can be multiplexed with, for example, data or control information or reference signals related to other UEs only in the frequency domain. In this case, only one or more subcarriers of the component carrier, rather than all subcarriers, will be used for the WUS. Although in this case, the UE may have to perform a transformation to the frequency domain in order to extract the power level of the resource element carrying the WUS, processing complexity and power can still be saved because no demodulation or decoding or other processing is required. In the case where multiplexing with other data is performed only in the unsilenced resources and not in the silent resources, it is even feasible to distinguish between silent resources and non-silenced resources and thereby detect the WUS without transformation.

[0203] One of the benefits of detecting a sequence of silent / unsilent resource elements is the possibility to embed some additional information into the sequence.

[0204] The UE monitors preconfigured resources for the occurrence of WUS. For example, the UE determines whether to start receiving other signals (e.g., SSB, PDCCH) based on information from the detection of LP-WUS. The information obtained by detection can be resource positions of "0" and / or non-"0" bits (silent and / or non-silent resource elements or codewords). Whether the UE detects only the positions of silent elements or only the positions of non-silent elements or both can be left to the UE implementation. For greater robustness, WUS sequence detection can include correlation of a preconfigured WUS sequence with a received signal (a signal received in a preconfigured resource element or codeword for monitoring WUS).

[0205] If the presence of a WUS is positively confirmed (e.g., by detecting all or most silent resource elements in expected locations with system resources), the UE may wake up, e.g., start receiving signals other than the WUS, i.e., monitor other synchronization or control resources other than the WUS opportunity. For example, after the UE has positively detected the presence of a WUS, the next step may be to monitor the SSB and / or PDCCH.

[0206] In addition, the WUS sequence may carry additional information, such as an ID of the detected sequence or some bits assigned to the sequence or the corresponding silence / non-silence level. For example, different UEs may use different sequences. The information carried by the WUS sequence may be some control information, as will be described in more detail later.

[0207] Some advantages of signaling WUS in a time domain sequence may be that the receiving UE can save power by detecting 0 / non-0 positions using only energy detection and / or low complexity sequence correlation in the time domain. This is friendly to low power receiver designs with structures that support dedicated modules for LP-WUS detection.

[0208] b. WUS sequence in frequency domain

[0209] In a specific example, the WUS includes a predefined sequence of muted and non-muted resource elements in the frequency domain of the time-frequency resource grid.

[0210] This is Figure 8 shown in . Specifically, Figure 8 A horizontal frequency axis is shown, on which the subcarriers are shown by solid or dashed lines. Figure 8In the example of , all subcarriers are within the same symbol, i.e. associated with the same time instance. Solid lines indicate non-silenced resource elements (subcarriers transmitting non-zero signals), and dashed lines indicate silenced resource elements (subcarriers transmitting zero signals). In this example, silenced and non-silenced (contiguous in the frequency domain) resource elements form one or more WUS sequences.

[0211] Although in this particular example, (multiple) WUS sequences are mapped to silent and non-silent resource elements in the frequency domain rather than the time domain, the UE behavior can be similar to that described above with reference to the WUS sequence in the time domain. For example, the UE can determine whether to wake up and start receiving other signals (e.g., SSB, PDCCH) based on information from the detection of LP-WUS. The information from the detection can be the presence or absence of a WUS sequence that can be detected by detecting the resource positions of "0" and / or non-"0" bits (e.g., the comb positions corresponding to silent and non-silent subcarriers). Some UEs can detect the WUS sequence by detecting only the presence and / or absence of power (energy) in the subcarriers of the WUS opportunity. Some UEs can perform a correlation of a pre-configured WUS sequence with the power (energy) detected in the subcarriers of the received codeword related to the WUS opportunity. The detected WUS sequence can carry information such as a sequence ID of the WUS sequence or a modulation bit (a bit modulated by the WUS sequence) for the time domain as described above. The positions of muted and unmuted resource elements in the frequency domain may be defined in the standard and / or preconfigured by signaling from the network node to the UE (e.g., according to RRC or system information). The WUS sequence may be common to all UEs in a cell, or common to a group of UEs, or UE-specific.

[0212] Muting in the frequency domain can reduce inter-symbol interference and improve coverage performance. This can also relax the time synchronization requirements of the receiver, which may be beneficial for lower power receiver designs with structures that support dedicated modules for LP-WUS detection.

[0213] References Figure 7 and Figure 8 The specific examples described are not intended to limit the present disclosure. Note that it is generally not necessary to provide WUSs that are continuous in the time domain and / or frequency domain. The WUS may be carried in resource elements dispersed in the time-frequency resources of a component carrier.

[0214] Regardless of whether the WUS sequence is in the time domain and / or the frequency domain, as described above, the WUS sequence can be used to carry some information. In some exemplary embodiments, such information is modulated into the silent / unsilent elements, for example, the silent element corresponds to the bit "0", the unsilent element corresponds to the bit "1", and vice versa. However, the information can also be carried by the identity of the sequence.

[0215] For example, the predefined sequence is one of a plurality of predefined sequences corresponding to the WUS. Each of the plurality of predefined sequences is associated with a corresponding content of the control information.

[0216] 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, while another sequence ID may be assigned to a second UE, and so on. In other words, by using a WUS sequence with a specific sequence ID, the corresponding UE to which the sequence ID is assigned may detect the presence of the sequence and determine wakeup accordingly. Other UEs assigned different sequence(s) will detect the absence of their assigned sequence(s) and will not wake up.

[0217] In an exemplary embodiment, the multiple sequences are mutually orthogonal sequences. In this case, they can be sent in the same resources (e.g., symbols and / or subcarriers). For example, three different and mutually orthogonal WUS sequences can be sent to three corresponding different UEs in the same resource element to wake them up. Each UE can detect whether its assigned WUS sequence is present in the resource element by correlating the assigned WUS sequence with the power (energy) received in the resource element. The multiple sequences used to indicate WUS to one or more UEs can be all or a subset of all possible mutually orthogonal sequences.

[0218] Note that it is not necessary to assign the WUS sequence (WUS sequence ID) to the corresponding UE as described above. In some exemplary embodiments, the WUS sequence is assigned to a cell or a UE group. In other words, there may be an association between the WUS sequence (WUS sequence ID) and the cell ID, or there may be an association between the WUS sequence (WUS sequence ID) and the group ID. The group ID identifies a specific UE group.

[0219] This association between a specific WUS sequence and a UE ID or a cell ID or a group ID may be understood as a WUS sequence carrying control information, ie, information corresponding to the UE ID, the cell ID or the group ID. The present disclosure is not limited to the control information.

[0220] Instead, in addition to or as an alternative to the UE ID and / or the cell ID and / or the group ID, the WUS sequence may be used to indicate one or both of the following:

[0221] - an offset after which the user equipment is to monitor signals other than WUS, and

[0222] - The user equipment should start monitoring the system synchronization signal and / or the physical downlink control channel PDCCH.

[0223] For example, a first specific sequence may indicate that the UE is to monitor SSB, a second specific sequence may indicate that the UE is to monitor PDCCH, and a third specific sequence may indicate that the UE is to monitor both SSB and PDCCH. If the sequences are orthogonal, the third specific sequence may be unnecessary because the same content can be indicated by sending both the first sequence and the second sequence at the same time. This is just one possible example. In another example, there is a specific sequence that signals the UE to detect both SSB and PDCCH, and there is no sequence that will allow a distinction between detecting SSB and detecting PDCCH.

[0224] The offset may be an offset in the time domain. It may be specified in any suitable unit, for example, in a number of symbols or time slots or subframes, etc. It is conceivable to also indicate the frequency resource(s) on which the other signal is expected. The frequency resource may indicate any bandwidth portion, such as a carrier, a subcarrier, etc.

[0225] It is possible to include additional or alternative control information. Note that the WUS sequence does not necessarily carry additional information and may only be used to detect whether to wake up.

[0226] In any of the foregoing examples, the one or more silent resource elements corresponding to the WUS or WUS sequence may be configured in system information or by a message received by the user equipment within a radio resource control (RRC) protocol message. For example, a WUS configuration common to all UEs in a cell or a WUS configuration common to a UE group may be signaled in system information (e.g., in one of the system information blocks (SIBs)). A UE-specific WUS configuration may be signaled to the UE via an RRC protocol message. However, the RRC message may also include a cell-common or group-common WUS configuration. The WUS configuration may include the configuration of WUS timing, for example, in which resource elements (multiple) UEs are to detect the presence or absence of WUS. This may be done by specifying a periodic time interval after which the UE will perform detection of the WUS and / or by specifying frequency resources (component carriers, cells, subcarriers, etc.) to be monitored.

[0227] In the above example, the UE detects whether the preconfigured WUS is present in the preconfigured resources (resource elements). 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 detecting the presence of a WUS to wake up. It is conceivable that if it is detected that the WUS does not exist, then wake up. It is also conceivable that if a first specific WUS is detected, then wake up, and if a second specific WUS is detected, then do not wake up. The term "specific WUS" means a specific, preconfigured one or more silent resource elements or a sequence of silent / unsilent resource elements as described above.

[0228] As described above, control signals different from WUS may include synchronization signals and / or system information and / or PDCCH. However, the present disclosure is not limited thereto, and WUS may instruct the UE to monitor only certain information in PDCCH (apply a certain subset of all configured RNTIs to detect DCI), etc. Alternatively or additionally, WUS may instruct the UE to send a certain signal such as a sounding reference signal, or a scheduling request, etc.

[0229] The presence of an unsilenced element in any of the above examples can be used as a measure of interference. For example, circuit 630 can be configured to perform:

[0230] - a measurement of interference based on power received in said one or more silent resource elements, and / or

[0231] - Measurement of Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) using one or more non-muted resource elements as reference signals.

[0232] The measurement of interference may be the interference portion of a channel state information (CSI) report or a received signal strength indicator (RSSI), for example as defined in section 5.2 of NR in 3GPP TS 38.214 (e.g., v17.2.0), in particular section 5.2.2.4 for CSI, and in sections 5.1.3, 5.1.4, 5.1.12, or 5.1.16 of 3GPP TS 38.215 (e.g., v17.1.0).

[0233] In the above examples, the focus is on WUS design and semantics. Such WUS design and semantics can enable various power-efficient implementations of the UE and corresponding implementations of the base station.

[0234] UE 610 includes circuit 630. Circuit 630 may include Figure 6 The WUS detection circuit 635 shown. The circuit can operate with lower complexity and power consumption. In addition, in an exemplary UE implementation, the WUS detection circuit 635 can operate independently and perform WUS detection (corresponding to the LP state). The circuit 630 may include Fig. 9 , which implements the physical layer to, for example, demodulate and possibly decode control signals and / or user data (physical layer payload). The control / data processing circuit 637 can be turned off (not performing any processing) in the LP state. It can be turned on when the WUS detection circuit 635 detects a WUS. Since the control / data processing circuit 637 is expected to have greater power consumption (and higher processing complexity) than the WUS detection circuit 635, power savings can be achieved.

[0235] Note that the LP state and WUS detection as described above can coexist with any existing power reduction method (such as DRX or format 2_6 or format 2_7 of DCI mentioned above). Specifically, WUS detection is located at a lower position on the physical layer: in the LP state, PDCCH is not monitored, so that format 2_6 or format 2_7 of DCI can be monitored only when not in the LP state. Unlike DRX, in the LP state, it is not necessary to monitor the paging occasion. In order to read the paging occasion, it is still necessary to read the synchronization channel and PDCCH. In the LP state, only WUS needs to be monitored (detection is performed to find out whether WUS exists). As in some embodiments, WUS is a physical layer signal that does not need to be demodulated or at least decoded (as part of baseband processing), and power reduction is expected. When demodulation is mentioned here, it means demodulation of signals in resource elements. Processing based on OFDM or other transformations can still be performed in some embodiments, but it is not necessary to perform in other embodiments as discussed above.

[0236] The network node 660 includes a circuit 680, which may also include a WUS generation circuit 685 configured to generate (multiple) WUS signals for one or more UEs. Note that in addition to the WUS generation circuit 685, the circuit 680 may also include Fig.10 The control / data processing circuit 687 is shown to perform physical layer processing, such as baseband processing of received signals for detection (eg, demodulation and decoding) or baseband processing for transmitting signals to one or more UEs (eg, modulation and coding).

[0237] Note that the WUS signal may be sent without beamforming. Alternatively, the WUS signal may be sent with beamforming (eg, carrying a beam index). In some embodiments, the WUS is different for different wireless cells or for each UE or UE group.

[0238] The present disclosure also provides methods corresponding to the actions performed by the above-mentioned circuit 630 and transceiver 620 of the UE and the above-mentioned actions performed by the above-mentioned circuit 680 and transceiver 670 of the network node.

[0239] For example, a method for performing at a user equipment (UE) is provided. The method includes obtaining a wireless signal. Specifically, the wireless signal can be wirelessly received by a transceiver of the UE and provided as Fig.11The method 1110 shown in is an input to the method 1110. The method 1110 monitors resources for the WUS. Specifically, the monitoring includes step 1120: detecting whether a preconfigured wake-up signal (WUS) is present in the received wireless signal. The WUS includes one or more silent resource elements. In the case where the presence of the WUS is detected ("Yes" after branch 1130), the method includes determining that the user equipment is to receive a control signal different from the WUS. After this determination, the method may include receiving 1140 the actual reception of a transmission of a control signal and / or a signal different from the WUS. As described above, the WUS may include a specific specification of the signal to be received / sent. In the case where the absence of the WUS is detected ("No" after branch 1130), the method returns to monitoring the WUS.

[0240] Similarly, a method for performing at a network node is provided. The method Fig.12 , and includes determining 1210 whether a user equipment (UE) is to receive a control signal different from a preconfigured wake-up signal WUS. In addition, the method includes: if it is determined that the UE will receive the control signal ("yes" in step 1210), including 1220 the WUS in the wireless signal, wherein the WUS includes one or more silent resource elements. This step may also include actually sending 1230 the wireless signal carrying the WUS.

[0241] In case it is determined that the UE does not receive the control signal ("No" in step 1210), the method returns to step 1210. Note that the method may further include: after sending 1230 the WUS to the UE, sending 1240 the control signal to the UE.

[0242] Two-part wake-up signaling

[0243] The disadvantages of the existing power reduction mechanisms described in the "Power Saving" section can be addressed as described in the above embodiment "Wake-up signal using silent resource elements" and / or in the embodiments about two-part wake-up signaling as described in more detail below. Some combinations of the two embodiments may also be advantageous.

[0244] In order to provide an efficient power saving mechanism, in this embodiment, two-part wake-up signaling is provided, and in the case where the WUS indicates that the UE is to receive control data different from the WUS and the WUI, the two-part wake-up signaling includes a wake-up signal (WUS) followed by wake-up information (WUI) in the time domain. Note that the WUS in this embodiment may have the features described in the embodiment "Wake-up signal using silent resource elements", but does not necessarily have them. In other words, the WUS in this embodiment is not necessarily a signal including one or more silent resource elements.

[0245] Compared to the above-mentioned possibility of WUS carrying additional information, adding a second part (WUI) to the wake-up signal can increase the control information capacity. In addition to this, the benefits of UE power saving and friendliness to dedicated low-power receivers can be maintained.

[0246] Two-part wake-up signaling applies to Fig.13 The communication system 1300 shown in FIG. The communication system 1300 may be a wireless communication system such as NR, similar to Figure 6 The communication system 1300 includes a UE 1310 and a network node 1360 communicating with each other via a wireless channel 1350. The UE 1310 has the same Figure 6 A similar structure to UE 610 is described.

[0247] The difference between UE 1310 and UE 610 specifically lies in the WUS / WUI detection circuit 1335 included in circuit 1330 instead of the WUS detection circuit 635 included in circuit 630. The structure of transceiver 1320 can be similar to transceiver 620. Specifically, user equipment 1310 includes a transceiver 1320 configured to receive wireless signals. This configuration can be implemented by a transceiver (similar to the case of transceiver 620), which includes one or more antennas, (multiple) amplifiers, and possible modulators and / or digital-to-analog converters from baseband to desired carriers. The specific hardware structure may vary with the specific UE implementation and the characteristics of the wireless communication system.

[0248] The UE 1310 further includes a circuit 1330 configured to:

[0249] - detect the presence of a wake-up signal (WUS) in the received wireless signal,

[0250] - based on the WUS, determining wake-up information according to the received wireless signal, and

[0251] - Based on the wakeup information, determining to receive control information other than the WUS and the wakeup information.

[0252] Circuit 1330 may include corresponding WUS / WUI detection circuit 1335 that performs the above-described detection of WUS and determination of WUI and determination that an additional signal is to be received.

[0253] A UE that monitors only the WUS may be considered to be in a low power (LP) state. Once the UE starts receiving signals other than the WUS and WUI, the UE may be considered to leave the LP state. The reception of the WUI may also be considered to be related to the LP state.

[0254] As described for the aforementioned embodiments, detection of the WUS may be performed within resources preconfigured for the WUS (e.g., in resources configured at 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 without reading other signals and in particular without reading the PDCCH or another signaling.

[0255] Examples of determining the wake-up information based on the WUS (according to the received wireless signal) include determining based on location and / or based on the content of the WUS.

[0256] Hereinafter, the WUS portion of the wake-up signaling may be referred to as part 1 signaling, and the WUI portion of the wake-up signaling may be referred to as part 2 signaling.

[0257] Network node 1360 has the same Figure 6 The network node (base station) 1360 differs from the network node 660 in that a WUS / WUI generation circuit 1385 is included in the circuit 1380 instead of the WUS detection circuit 685 included in the circuit 680. The structure of the transceiver 1370 may be similar to that of the transceiver 670.

[0258] Specifically, a network node 1360 is provided, which includes a circuit 1380, wherein:

[0259] -determining whether a user equipment (UE) is to receive control information different from a preconfigured wake-up signal (WUS) and wake-up information; and

[0260] - In case it is determined that the UE is to receive the control information, a WUS is included in the wireless signal, and the WUS is followed by the wake-up information.

[0261] In addition, the network node 1360 includes a transceiver 1370 that transmits a wireless signal. For example, when the network node 1360 determines that the UE should wake up (e.g., because there is data to be received by the UE or a condition changes such that the UE should receive some new configuration or synchronization, etc.), the circuit 1380 generates a WUS and controls the transmitter 1370 to send the WUS in a resource preconfigured for monitoring the WUS in the LP state. Then, the circuit 1380 generates a WUI and controls the transmitter 1370 to send the WUI in a resource that can be determined based on (e.g., relative to) the location of the WUS, as will be described later.

[0262] On the UE side, the UE monitors the preconfigured resources to find the WUS (which is also preconfigured). Based on the detection result of the WUS, the UE decides whether to further detect the WUI. Specifically, if a WUS is detected (indicating that the UE should wake up), the UE will receive the WUI in the resources determined based on the WUS content or location.

[0263] The structure of WUS part #1 can be the same as described in the aforementioned embodiment, that is, the WUS can include at least one silent resource element. However, the present embodiment is not limited to this WUS structure. The WUS can be any preconfigured signal that does not necessarily have any silent part. As mentioned above, when "preconfigured" is mentioned. This means that it is configured before the UE enters the LP state, that is, before the UE stops receiving or monitoring control channels and data channels other than the WUS (and WUI). The WUS can be defined by power level and / or phase, and can be mapped on multiple WUS opportunity resource elements, which can but do not have to be adjacent in the time domain and / or frequency domain. For example, the WUS can be an OFDM codeword sequence with a preconfigured signal power level and / or shape, etc.

[0264] Fig.16 An example is shown in which determining the wake-up information (WUI) includes determining a location of a resource carrying the wake-up information based on a preconfigured first offset (offset_a) relative to a location of the WUS in the time domain.

[0265] Specifically, Fig.16 An OFDM symbol 1610 is shown that may carry a WUS (wake-up signaling, part 1 to be monitored in the LP state). In this example, the WUS is mapped onto a sequence of OFDM symbols. However, as described above, in general, the WUS may be mapped onto resource elements that are not necessarily adjacent in the time domain and / or frequency domain. After offset_a, resources carrying a WUI 1620 are shown. Note that in this example, offset_a is measured in the time domain from the end of the WUS resource to the beginning of the WUI resource. However, the present disclosure is not limited to such an embodiment. In general, a first offset may be defined between the beginning of the WUS and the beginning of the WUI or in any other manner. One of the advantages of defining a first offset is to reduce signaling in order to find the WUI. Such an advantage is maintained regardless of how precisely the first offset is defined.

[0266] The time domain gap offset_a between part 1 and part 2 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 a cell, or common to each UE group of a cell, or individual to the UE.

[0267] Note that when the UE is not in the LP state, it is not necessary to perform monitoring of WUS / WUI. In other words, once the UE starts monitoring other control signals (SSB, PDCCH, etc.) or receives a data signal, the UE can stop monitoring WUS. This corresponds to leaving the LP state.

[0268] The transmit power level of the WUS and / or WUI may be adapted to the conditions in the communication system. To effectively indicate the transmit power level, the transmit power level may be indicated as a ratio to an already indicated power level. For example, one or both of the following may be preconfigured:

[0269] - the ratio of the energy per resource element (RE) carrying the WUS to the energy per RE carrying the reference signal that can be used to demodulate the wake-up information, and

[0270] - The ratio of the energy per RE carrying the wake-up information to the energy per RE carrying a reference signal that can be used to demodulate the wake-up information.

[0271] When "the ratio of X and Y" is mentioned herein, the ratio X / Y or the ratio Y / X is meant. The energy per resource element can be abbreviated as EPRE and indicates the power of one resource element (RE). This can be used for any channel (e.g., synchronization signals, reference signals, PDSCH, etc.). This value does not vary with system bandwidth or number of RBs. However, the present disclosure is not limited to indicating transmit power levels in this manner. Other metrics and corresponding ratios may be used. Therefore, providing a ratio relative to WUS can improve the reception robustness of WUI reference and / or data, and may improve the reception robustness of other signals.

[0272] Typically, SSB will be used for reference energy levels (e.g., in NR, primary synchronization signal and / or secondary synchronization signal). However, in LP mode, the UE may not need to receive synchronization signals.

[0273] The pre-configuration may be performed by the Radio Resource Control (RRC) protocol (network node sending a configuration message to the UE) or obtained from system information. However, typically, the ratio of the WUS Part 1 EPRE and the WUS Part 2 DMRS EPRE may also be fixed. Variations are possible, for example, there may be several possible ratios fixed in the standard, and the configurability may be limited to signaling which of them should be applicable. In addition to or as an alternative to pre-configuring the WUS before the UE enters the LP state, it is conceivable that the power ratio is signaled within the WUS. Thus, the UE may measure the power in the WUS (Part 1 WUS signaling) and then apply the pre-configured ratio to obtain the DMRS EPRE of the WUI.

[0274] The ratio of WUI_EPRE (for non-DMRS resource elements) to WUI_DMRS EPRE is fixed (e.g., one or more values ​​defined by the standard) and / or configurable (e.g., through SIB or RRC). Thus, the UE can measure the WUI DMRS and apply this ratio to receive data. Note that these are just some examples that do not limit the present disclosure. In general, other ratios may be fixed and / or preconfigured. For example, a ratio of WUS (Part 1 wake-up signaling) and WUI information (data sent within the WUI instead of reference signals such as DMRS) may be used. Reference signals other than DMRS may be used in the ratio instead of the DMRS mentioned in the above examples.

[0275] Providing two parts of the signal may facilitate some additional power efficiency gains. For example, detecting the presence of a WUS (part 1 of the wake-up signaling) does not include demodulation and forward error correction (FEC) decoding of the signal in each resource element. Additionally or alternatively, determination of the wake-up information (part 2 of the wake-up signaling) includes demodulation and / or FEC decoding.

[0276] In other words, in this example, the WUS is a physical signal that can be detected only by measurement of received power, without any more complex baseband physical layer processing (and without any higher layers), such as MAC, RLC, etc. Such a WUS provides the advantage that the processing at the UE can be greatly simplified, thereby saving power. Accordingly, when one or more UEs are to be woken up, the network node can easily generate such a signal and embed such a signal into a system resource preconfigured for carrying the WUS. In order to efficiently use the transmit power, the WUS can be repeatedly transmitted using a sequence of beams with mutually different directivities.

[0277] On the other hand, the WUI carries information (control data). In order to transmit control data reliably and resource efficiently, it may be desirable to apply some physical layer processing, such as modulation or FEC or beamforming, etc. Therefore, in this example, the WUI is a modulated and possibly coded signal. Beamforming, precoding or space-time coding may be applied to the WUI. Note that when modulation and demodulation are mentioned in this article, modulation of data mapped to one resource element (subcarrier, symbol) is meant. For example, the WUI may be modulated by BPSK, QPSK or generally any order of QAM or by another type of modulation. Before modulation, the information to be sent in the WUI may be FEC encoded or repeated, etc. Since the WUI is sent only when the WUS indicates that the UE or multiple UEs are to leave the LP state, the increase in power consumption caused by the physical layer processing is limited. Providing information within the WUI can speed up wake-up and enable the UE to quickly obtain synchronization and establish a connection for data transmission (if necessary). For example, if a UE detects a WUS followed by a WUI, based on the WUI payload (information carried by the WUI), the UE can determine whether and where to receive other signals (eg, SSB and / or PDCCH).

[0278] Fig.14 and Fig.15 The functional structure of the corresponding circuit 1330 of the UE and the circuit 1380 of the network node are shown. Specifically, the circuit 1330 of the UE includes a WUS detection circuit 1335a and a WUI detection circuit 1335b, and both the WUS detection circuit 1335a and the WUI detection circuit 1335b can be considered as Fig.13 1330. The WUS / WUI detection circuit 1335a is a portion of the WUS / WUI detection circuit 1335 shown. The WUS detection circuit 1335a implements simple power level detection as described above, while the WUI detection circuit 1335b can implement at least a portion of the physical layer processing for control / user data processing performed by the control / data processing circuit 1337. The control / data processing circuit 1337 is also a portion of the circuit 1330. Note that this functional structure is merely exemplary. It is contemplated that WUI detection involves processing similar to that applied to user / control data, so that the control / data processing circuit 1337 can also be used to process (detect) WUI.

[0279] Accordingly, the circuit 1380 of the network node includes a WUS generation circuit 1385a and a WUI generation circuit 1385b, both of which can be considered as Fig.131380. As described above, the WUS generation circuit 1385a implements the generation of power levels mapped into pre-configured resource elements, while the WUI generation circuit 1385b can implement at least a portion of the physical layer processing for control / user data processing performed by the control / data processing circuit 1387. The control / data processing circuit 1387 is also part of the circuit 1380. Note that this functional structure is merely exemplary. It is contemplated that WUI generation involves processing similar to that applied to user / control data generation, so that the control / data processing circuit 1387 can also be used to process (generate) WUI.

[0280] Compared to providing WUS only as described in the aforementioned embodiments, adding a second part (WUI) to WUS can increase the control information capacity. In addition, the benefits of UE power saving and friendliness to dedicated low-power receivers are maintained. For example, the detection of WUS requires only a small amount of processing and therefore only a small amount of battery power. During WUS monitoring, the control / data processing circuit 1337 can be inactive or even turned off. Similarly, the WUI detection circuit 1335b can be inactive or at least turned off until the presence of WUS is confirmed (detected). Once WUS is detected, the control / data processing circuit 1337 and the WUI detection circuit 1335b can be turned on or activated again.

[0281] Fig.17 Exemplary implementations are shown that may be used with any of the above examples of the present embodiment (two-part wake-up signaling) or the previous embodiment (WUS including silent resource element(s)).

[0282] Therefore, the wake-up information includes an indication of a second offset (offset_b) in the time domain. The second offset indicates one of the following:

[0283] - the offset between the wake-up information and the resource containing the control information, or

[0284] - Minimum offset at which the user equipment shall start monitoring the resources comprising control information.

[0285] 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 due to less search effort. The minimum offset may be beneficial for demand design and implementation flexibility.

[0286] Fig.17 An exemplary WUS 1700 and a synchronization signal (SSB 1730) following the WUS 1700 in the time domain and representing control information are shown. Fig.17, the offset is between the end of WUS 1700 and the start of SSB 1730. As described above for offset_a, offset_b does not have to be measured in this way. Instead, it can be defined between WUS and the start or end of SSB, or in any other way. offset_b can be defined between WUI and. However, typically, offset_b can be defined between WUS (or WUI) and control information. Control information is, for example, a synchronization signal (such as a synchronization signal block SSB) or a physical downlink control channel PDCCH, etc.

[0287] Fig.17 This is for illustration only. The WUI is not shown in the figure.

[0288] Regarding UE operation, circuit 1330 determines to receive control information other than WUS and receives wake-up information according to the second offset. As described above, the second offset indicates an offset between the wake-up information and the resource including the control information or a minimum offset at which the user equipment is to start monitoring the resource including the control information. The second offset is fixed, preconfigured, or received in the wake-up information, or a combination thereof.

[0289] After the UE decides to continue receiving other DL signals based on the received WUS, the UE may start receiving SSB, where it leaves at least a time offset (offset_b) after the WUS. However, the UE can make other decisions: for example, the UE may not start receiving SSB and may need more time to boot up the electronics, etc. In other words, some UEs can wake up after receiving the WUS and after waiting for the duration of offset_b.

[0290] offset_b may be fixed or configurable (eg, by SIB or RRC).As also described for offset_a, offset_b may be configured per cell, per UE group, or per individual UE.

[0291] Said reception of control information corresponds to leaving the low power operating state.However, it may be considered that the UE has left the LP state in case of receiving a WUI.

[0292] With a minimum time offset (offset_b) after being woken up by WUS and before receiving SSB, the UE may have enough time to turn on modules other than a possible dedicated module for receiving WUS. This may correspond to the necessary ramp-up time for an efficient low-power receiver design that complies with UE capabilities.

[0293] The wake-up information (WUI) may include one or more of the following:

[0294] -PDCCH search space configuration (e.g. defining the resources where the UE is to monitor (blindly detect) the PDCCH for receiving control information such as DCI),

[0295] - Discontinuous Reception (DRX) configuration (e.g., configuration of DCI cycle and / or configuration of short / long DCI cycle),

[0296] - Bandwidth Part (BWP) configuration (e.g., for reception and / or transmission of control or payload data),

[0297] - beam index configuration (e.g. for receiving or transmitting control information or user data (payload)),

[0298] - Channel State Information Reference Signal (CSI-RS) configuration (e.g., the location of the CSI-RS in the resource and / or the transmission power level of the CSI-RS; alternatively or in addition to the CSI-RS, other types of reference signals may be configured by the control information),

[0299] - the MIMO layer number used to transmit or receive data (control and / or payload),

[0300] - the ratio of the energy per resource element (RE) carrying the WUS to the energy per RE carrying reference signals that can be used to demodulate the PDCCH, and

[0301] - The ratio of the energy per RE carrying the synchronization signal to the energy per RE carrying the reference signal that can be used to demodulate the PDCCH.

[0302] The above control information can help the UE to quickly start sending or receiving. Note that the present disclosure is not limited to the above parameters. In addition to WUI in the case of waking up from LP, some of the above parameters can be signaled through DCI (in PDCCH) or configured via RRC.

[0303] It may not be necessary to indicate all of this data in the WUI. Some configuration and additional control information may be received via the PDCCH. The UE may start reading the PDCCH after receiving the WUS or after offset_c after receiving the WUI. Fig.18 In Fig.18 , a wake-up signaling 1800 is shown. For example, the wake-up signaling 1800 is a WUS (part 1), which is applicable to the aforementioned embodiment (WUS with silent RE), but can also be applied to this embodiment. Alternatively, the wake-up signaling 1800 is a WUI (part 2), which is applicable to this embodiment. Fig.18As shown, after receiving the wake-up signaling 1800, the UE starts to receive (monitor) the PDCCH monitoring opportunity 1840. The PDCCH monitoring opportunity (eg, search space configuration) may be pre-configured (configured before the UE enters the LP state) or may be configured through the WUI.

[0304] The value of offset_c may be the same as or different from the value of offset_b. Furthermore, instead of signaling both offset_b and offset_c, it is conceivable to signal only a single offset offset_bc after which the UE starts receiving both synchronization and PDCCH. In this case, offset_bc may be defined as the minimum offset after which the UE starts receiving synchronization signals (e.g., SSB) and PDCCH.

[0305] Similar to offset_b, offset_c can be defined as an actual offset or a minimum offset. For example, after the UE decides to continue receiving other downlink signals (except WUS and WUI), the UE starts receiving PDCCH, where the PDCCH has at least a time offset offset_c after the WUS (or WUI). offset_c can be fixed or configurable. The corresponding offset_c configuration can be provided through system information (e.g., SIB) or through higher layer signaling (e.g., RRC), or provided within the WUI or WUS. Signaling the actual offset may be beneficial for power saving due to less search work - the UE will not need to monitor many PDCCH opportunities. The minimum offset is beneficial for the demand design and implementation flexibility of UE implementation. Generally, with a time offset after being awakened by LP-WUS and before receiving PDCCH, the UE may have enough time to turn on other modules except for the possible dedicated module for LP-WUS. For appropriate low power receiver design, some UEs may need this time to ramp up.

[0306] Some systems such as LTE-A and NR provide the possibility for UE to operate on multiple component carriers, that is, to support multi-band operation of UE. The component carrier here can generally be understood as a carrier for a frequency band, on which an orthogonal transform (such as FFT for OFDM or DFT for some systems, etc.) is performed to transform the codeword carrying data in the subcarrier of the frequency band into the time domain at the transmitting side.

[0307] To further save some power, the detection of the presence of a WUS is performed, for example, on a preconfigured subset of the configured system component carriers. The configured system component carriers may correspond to cells in a cell list or PCI (Physical Cell ID) list (as in NR).

[0308] In other words, WUS is sent only in a single component carrier, or in a limited set of component carriers (meaning less than all component carriers). A single carrier or carriers from a limited set may be in different frequency bands. These frequency bands may serve different cell sizes. As a result, idle mode UEs of different frequency bands / carriers may be accumulated by camping on (multiple) cells (carriers) that send WUS. The cells / carriers that send WUS signals may be configured by system information. In other words, the UE may read the system information of the cell to determine whether the cell supports LP operation, in particular whether the cell sends WUS. Then, in order to take advantage of LP operation - in order to be able to enter the LP state and monitor WUS, the UE may select a cell that sends WUS (and, for example, camp on a cell in idle mode).

[0309] Compared with the case where WUS is signaled in all cells, sending WUS only in a limited set of component carriers helps save some resources. Therefore, in this case, a larger guard band can be reserved between WUS and other channels / signals in the resource grid. Such a larger guard band can facilitate robust detection of WUS.

[0310] After receiving the WUS, the UE may move to a specific carrier for normal operation in an idle / inactive (or connected) state, for example, the UE starts receiving / sending other signals. The specific carrier for normal operation may correspond to the carrier on which the WUS is received, but not necessarily. The specific carrier for normal operation may be preconfigured (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 based on received control information (e.g., system information or other control information) after wake-up.

[0311] Since the WUS is only sent in a limited subset of component carriers, relatively less overhead is required, but slightly more complex UE behavior and specification impact can be expected.

[0312] The present disclosure is not limited to the case where a WUS is transmitted on one or a limited number of component carriers.In an example, the detection of the presence of a WUS is performed on all configured system component carriers.

[0313] Therefore, a WUS is configured and sent for each component carrier (frequency band). Therefore, the component carrier of the WUS and the component carrier of normal operation can be the same. Therefore, it is not necessary to perform additional optimization of mobility. The UE can reside in the best cell because each cell supports LP operation and therefore sends a WUS. Compared to the above example, a relatively small guard band can be reserved for the efficiency of the WUS. Therefore, a larger control overhead but less complex UE behavior and specification impact can be expected.

[0314] As described above, the WUS may be implemented as a sequence of predefined (eg, muted and unmuted) resource elements. The WUS may be different for different cells (component carriers), ie the WUS sequence may be associated with a cell ID (or component carrier ID).

[0315] The present disclosure provides methods corresponding to the steps (actions) previously described as being performed by a UE and / or a network node.

[0316] For example, a method for performing at a user equipment (UE) is provided. The method comprises Fig.19 The flowchart is shown and includes the following steps:

[0317] - In step 1910, a wireless signal is received.

[0318] - Detecting the presence of a 1920 wake-up signal (WUS) in the received wireless signal.

[0319] Based on the WUS, determine 1930 wake-up information (WUI) from the received wireless signal. For example, if the WUS is detected ("yes" in step 1920), receive the WUI. In some examples, the WUI can be received in a resource that the UE can determine based on the location and / or content of the WUS.

[0320] - Based on the wake-up information (WUI), it is determined 1940 that control information other than the WUS and the wake-up information is received.

[0321] The method may further include actually receiving the control information. The "No" in step 1920 means that in the case where no WUS is detected in the pre-configured resources (WUS opportunities), the UE remains in LP mode and continues to monitor only WUS, as described above with reference to Figures 13 to 18 This has been described for this embodiment.

[0322] Fig. 20 A method for performing at a network node is shown. The method comprises:

[0323] -Determine 2010 whether the user equipment (UE) is to receive control information different from the preconfigured wake-up signal (WUS) and different from the wake-up information (WUI). This corresponds to the UE waking up from the LP state.

[0324] - In case it is determined that the UE is to receive control information ("yes" in step 2010), including 2020 the WUS in the wireless signal, followed by including 2030 the wake-up information, and

[0325] - Sending a wireless signal (Sending WUS in step 2020 and sending WUI in step 2030)

[0326] - Including 2040 the control information in a radio signal to be sent to the UE and sending the radio signal.

[0327] The "No" in step 2010 indicates that the base station (network node) returns to the determination step 2010, i.e., regularly checks whether to wake up the UE (or multiple UEs). The UE may be woken up (for example, if there is some data to be exchanged (sent to or received from the UE), etc.). The specific reason may be different based on the implementation of the network node function (such as scheduling and resource management functions, etc.).

[0328] Two-part wake-up signal, where part 1 includes one or more silent resources

[0329] Two embodiments have been described above, each with multiple examples: a WUS including one or more silent resource elements and a two-part wake-up signaling including a WUS and a WUI.

[0330] The above two embodiments and their corresponding exemplary implementations can be combined. Several examples of such combinations are provided below. However, the present disclosure is not limited to those combinations.

[0331] In an example, the WUS including at least one silent resource element or symbol may carry additional information. In an exemplary embodiment, determining that the user equipment is to receive a control signal different from the WUS includes: receiving control information (which is the above-mentioned wake-up information (WUI)) in a resource determined based on the location of the WUS via the transceiver 620, the control information indicating whether to receive one or more of a synchronization signal, system information, and a PDCCH and / or in which resources to receive one or more of the synchronization signal, system information, and the PDCCH.

[0332] In other words, a WUS with at least one blank resource element (e.g., a WUS including a sequence of muted and unmuted elements) is followed by a WUI that indicates (to a UE or multiple UEs) in which resources (or starting from which point in time) the UE should receive SSB or SIB or PDCCH. Note that both the WUS and the WUI may be common to UEs in the same cell, or may be common to UEs in a predetermined UE group, or may both be UE-specific. However, the present disclosure is not limited to such examples. For example, the WUS may be UE-common (cell or group), while the WUI may be UE-specific (e.g., carrying UE ID, etc.).

[0333] As described above, the resources carrying the WUI may be located within a preconfigured time domain offset relative to the location of the WUS.In general, the WUI may be designed according to any of the examples discussed in the two-part wake-up signaling embodiment.

[0334] Thus, the WUS may include one or more of the silent resource elements, and the WUS may be followed by the WUI. For example, the WUS includes a predefined sequence of one or more silent resource elements and one or more unsilenced resource elements, and at least one of the following applies:

[0335] - A WUS comprises a predefined sequence of muted and non-muted resource elements in the time domain of a time-frequency resource grid;

[0336] - the WUS comprises a predefined sequence of silent symbols and unsilenced symbols in the time domain, and each of said symbols corresponds to a plurality of resource elements associated with the same time and a plurality of subcarriers in a time-frequency resource grid of an orthogonal frequency division system;

[0337] - A WUS comprises a predefined sequence of muted and non-muted resource elements in the frequency domain of a time-frequency resource grid.

[0338] WUS and WUI may carry some additional control information as described above. Specifically, control information that may help UE quickly start sending / receiving data may be distributed to WUS and WUI, so that part of the information is carried by WUS and the other part is carried by WUI.

[0339] Some variations of the embodiments

[0340] Note that although some examples herein show that in the LP state, no synchronization signal is received, embodiments are contemplated in which synchronization signals are monitored but the PDCCH is not monitored.

[0341] The above embodiments are not limited to NR, but are easily applicable to NR. For example, the SCS (subcarrier spacing) used in any of the above technical solutions may be 3.75 kHz, 7.5 kHz, or 15 kHz, although any number compared to other time / frequency resources may be used without limitation.

[0342] In order to increase the robustness of WUS detection, repetition of the same signal / sequence can be used for any of the above technical solutions. For example, the WUS may include one or more repetitions of a preconfigured sequence. The sequence may carry some additional information, such as beam index, cell index, UE index, UE group index, frequency, etc. Alternatively or additionally, the information carried by the WUI may be repeated in the WUI.

[0343] The WUS sequence can be one of a number of orthogonal or quasi-orthogonal sequences such as Zadoff-Chu (ZC) sequence, golden sequence, hadamard code or walsh code, etc. It is advantageous if the sequence has maximum autocorrelation at shift 0 and has a possible low (eg, 0) correlation at any other shift.

[0344] The sequence of silent resources and / or unsilenced resources forming the WUS may be preconfigured via SIB / RRC, or calculated by the UE based on the cell ID, based on the beam index, or based on the frequency resource index (e.g., BWP index), or used for blind detection by the UE. For example, when the UE knows the cell ID, it can determine the sequence to search for in the preconfigured resource elements. Similarly, once the UE knows the current beam index and / or BWP index (in the case where they are associated with a sequence), the UE can determine the sequence and check whether it exists in the preconfigured resources.

[0345] In the case where the sequence is not explicitly associated or not associated with parameters known to the UE, the UE can blindly try sequences in the preconfigured set of sequences, i.e. check if they are present in the preconfigured WUS resources. When one of such sequences is present, it is interpreted as a WUS and the UE can decide to wake up. In other words, the WUS sent to the UE can be any one of the sequence pool (set).

[0346] By measuring the signal over the sequence (unsilenced portion), the UE may be able to obtain measurements for mobility and / or radio link monitoring, such as reference signal received power (RSRP) and / or reference signal received quality (RSRQ). In other words, the WUS may be used as a reference signal for some measurement purposes.

[0347] By measuring received power via blank / silent resources, the UE may obtain interference measurements, such as interference level for CSI and / or RSSI for mobility.

[0348] In the technical solution where the UE detects WUS to determine the next step behavior, in addition to or as an alternative to receiving downlink signals (e.g., SSB and PDCCH), the behavior may also include sending other uplink signals. Such uplink signals may be sounding reference signals, PUCCH, PUSCH, PRACH, etc.

[0349] Hardware and software implementations of the present disclosure

[0350] The present disclosure can be implemented by software, hardware, or the cooperation of software and hardware. Each functional block used in the description of each of the above embodiments can be partially or entirely implemented by an LSI such as an integrated circuit, and each process described in each embodiment can be partially or entirely controlled by the same LSI or a combination of LSIs. The LSI can be formed as a chip alone, or a chip can be formed to include some or all of the functional blocks. The LSI may include a data input terminal and a data output terminal coupled thereto. Depending on the degree of integration, the LSI here may be referred to as an IC (integrated circuit), a system LSI, a super LSI, or a super LSI. However, the technology for implementing the integrated circuit is not limited to the LSI, and can be implemented by using a dedicated circuit, a general-purpose processor, or a dedicated processor. In addition, an FPGA (field programmable gate array) that can be programmed after manufacturing the LSI or a reconfigurable processor in which the connection and setting of the circuit unit set inside the LSI can be reconfigured can be used. The present disclosure can be implemented as digital processing or analog processing. If future integrated circuit technology replaces LSI due to the advancement of semiconductor technology or other derivative technologies, future integrated circuit technology can be used to integrate functional blocks. Biotechnology can also be applied.

[0351] The present disclosure may be implemented by any kind of device, apparatus, or system having a communication function, which is referred to as a communication device.

[0352] The communication device may include a transceiver and processing / control circuits as 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.

[0353] Some non-limiting examples of such communication devices include phones (e.g., cellular (cell) phones, smart phones), tablets, personal computers (PCs) (e.g., laptops, desktops, netbooks), cameras (e.g., digital cameras / camcorders), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices), game consoles, digital book readers, telehealth / telemedicine (remote health and medicine) devices, and vehicles that provide communication capabilities (e.g., cars, airplanes, ships), and various combinations thereof.

[0354] The communication devices are not limited to portable or movable, and may also include any kind of non-portable or fixed devices, equipment, or systems, such as smart home devices (e.g., appliances, lighting, smart meters, control panels), vending machines, and any other "things" in an "Internet of Things (IoT)" network.

[0355] Communications may include exchanging data via, for example, cellular systems, wireless LAN systems, satellite systems, etc., and various combinations thereof.

[0356] The communication apparatus may include a device such as a controller or a sensor coupled to a communication device that performs the communication functions described in the present disclosure. For example, the communication apparatus may include a controller or a sensor that generates a control signal or a data signal used by the communication device that performs the communication functions of the communication apparatus.

[0357] The communication device may also include infrastructure such as base stations, access points, and any other device, equipment, or system that communicates with or controls devices such as the above non-limiting examples.

[0358] In addition, various embodiments may also be implemented by means of software modules executed by a processor or directly in hardware. Combinations of software modules and hardware implementations are also possible. Software modules may be stored on any type of computer-readable storage medium. Specifically, according to another embodiment, a non-transitory computer-readable recording medium is provided. The recording medium stores a program that, when executed by one or more processors, causes one or more processors to perform the steps of the method according to the present disclosure.

[0359] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. In addition, any connection is appropriately referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) is used to send instructions from a website, server or other remote source, the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) is included in the definition of the medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals or other temporary media, but are actually directed to non-temporary tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser optical disks, optical optical disks, digital versatile disks (DVDs), floppy disks and blue-ray disks, wherein disks usually reproduce data magnetically, and optical disks reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0360] It should also be noted that the various features of the different embodiments may be used alone or in any combination as the subject of another embodiment. It will be appreciated by those skilled in the art that many changes and / or modifications may be made to the disclosure as shown in the specific embodiments. Therefore, the present embodiments are considered to be illustrative and non-restrictive in all respects.

[0361] Other aspects

[0362] Aspects of the first embodiment are summarized as follows.

[0363] According to a first aspect, a user equipment (UE) is provided. The UE comprises: a transceiver that receives a wireless signal; and a circuit that (i) detects whether there is a preconfigured wake-up signal (WUS) in the received wireless signal, wherein the WUS comprises one or more silent resource elements, and (ii) determines that the user equipment is to receive a control signal different from the WUS when the WUS is detected.

[0364] According to a second aspect provided in addition to the first aspect, the WUS comprises a predefined sequence of one or more muted resource elements and one or more un-muted resource elements.

[0365] According to a third aspect provided in addition to the second aspect, the WUS comprises a predefined sequence of muted and non-muted resource elements in the time domain of the time-frequency resource grid.

[0366] According to a fourth aspect provided in addition to one of the second aspect or the third aspect, the WUS includes a predefined sequence of silent codewords and unsilent codewords in the time domain, and each of the codewords corresponds to multiple resource elements associated with the same time and multiple subcarriers in a time-frequency resource grid of an orthogonal frequency division system.

[0367] According to a fifth aspect provided in addition to one of the second to fourth aspects, the WUS comprises a predefined sequence of muted and non-muted resource elements in the frequency domain of the time-frequency resource grid.

[0368] According to a sixth aspect provided in addition to one of the second to fifth aspects, the predefined sequence is one of a plurality of predefined sequences corresponding to the WUS; and each of the plurality of predefined sequences is associated with a corresponding content of the control information.

[0369] According to a seventh aspect provided in addition to the sixth aspect, the control information indicates one or more of the following:

[0370] -Cell ID,

[0371] -UE Group ID,

[0372] -UE ID,

[0373] - an offset after which the user equipment will monitor signals other than WUS;

[0374] - The user equipment will start monitoring the system synchronization signal and / or the physical downlink control channel PDCCH.

[0375] According to an eighth aspect provided in addition to any one of the first to seventh aspects, a control signal different from the WUS includes a synchronization signal and / or system information and / or a PDCCH.

[0376] According to the ninth aspect provided in addition to any one of the first to eighth aspects, determining that a user equipment is to receive a control signal different from the WUS includes: receiving control information via the transceiver in resources determined based on the position of the WUS, the control information indicating whether to receive one or more of synchronization signals, system information and PDCCH and / or in which resources to receive one or more of the synchronization signals, system information and PDCCH.

[0377] According to the tenth aspect provided in addition to the ninth aspect, the resource carrying the control information is located within a preconfigured time domain offset relative to the location of the WUS.

[0378] According to the eleventh aspect provided in addition to any one of the first to tenth aspects, the circuit performs: (i) measurement of interference based on power received in the one or more silent resource elements, and / or (ii) measurement of reference signal received power (RSRP) or reference signal received quality (RSRQ) using one or more non-silent resource elements as reference signals.

[0379] According to a twelfth aspect provided in addition to any one of the first to eleventh aspects, the WUS is different for different wireless cells.

[0380] According to a thirteenth aspect, a network node is provided, comprising: a circuit that determines whether a user equipment (UE) is to receive a control signal different from a preconfigured wake-up signal (WUS), and includes the WUS in a wireless signal if it is determined that the UE is to receive the control signal, wherein the WUS includes one or more silent resource elements; and a transceiver that sends the wireless signal.

[0381] According to a fourteenth aspect, a method performed at a user equipment (UE) is provided, the method comprising: receiving a wireless signal, detecting whether there is a preconfigured wake-up signal (WUS) in the received wireless signal, wherein the WUS includes one or more silent resource elements, and upon detecting the presence of the WUS, determining that the user equipment is to receive a control signal different from the WUS.

[0382] According to a fifteenth aspect, a method performed at a network node is provided, the method comprising: determining whether a user equipment (UE) is to receive a control signal different from a preconfigured wake-up signal (WUS); in a case where it is determined that the UE is to receive the control signal, including the WUS in a wireless signal, wherein the WUS comprises one or more silent resource elements; and sending the wireless signal.

[0383] An integrated circuit (IC) (for a user equipment (UE)) is provided. The IC circuit is configured to (i) detect the presence of a preconfigured wake-up signal (WUS) in a received wireless signal, wherein the WUS includes one or more silent resource elements, and (ii) upon detecting the presence of the WUS, determine that the user equipment is to receive a control signal different from the WUS. Note that the reception of the wireless signal may correspond to reception at an input of the IC.

[0384] An IC (for a network node) is also provided, the IC being configured to determine whether a user equipment (UE) is to receive a control signal different from a preconfigured wake-up signal (WUS), and if it is determined that the UE is to receive the control signal, include the WUS in a wireless signal, wherein the WUS includes one or more silent resource elements.

[0385] Aspects of the second embodiment are summarized as follows.

[0386] According to a first aspect, a user equipment (UE) is provided. The UE includes: a transceiver that receives a wireless signal; and a circuit that (i) detects the presence of a wake-up signal (WUS) in the received wireless signal; (ii) determines wake-up information based on the WUS according to the received wireless signal; and (iii) determines to receive control information other than the WUS and the wake-up information based on the wake-up information.

[0387] According to a second aspect provided in addition to the first aspect, determining the wake-up information includes determining a location of a resource carrying the wake-up information based on a preconfigured first offset in a time domain relative to a location of the WUS.

[0388] According to a third aspect provided in addition to the first aspect or the second aspect, at least one of the following is preconfigured: (i) a ratio of energy per resource element (RE) carrying a WUS to energy per RE carrying a reference signal that can be used to demodulate wake-up information, and (ii) a ratio of energy per RE carrying wake-up information to energy per RE carrying a reference signal that can be used to demodulate wake-up information.

[0389] According to a fourth aspect provided in addition to the third aspect or the second aspect, the pre-configuration is performed by a radio resource control (RRC) protocol or obtained from system information.

[0390] According to a fifth aspect provided in addition to any one of the first to fourth aspects, detecting the presence of the WUS does not include demodulating and forward error correction (FEC) decoding signals in each resource element, and / or determining the wakeup information includes demodulating and FEC decoding.

[0391] According to a sixth aspect provided in addition to any one of the first to fifth aspects, the wake-up information includes an indication of a second offset in the time domain, and the second offset indicates one of: an offset between the wake-up information and a resource including control information, or a minimum offset at which the user equipment starts monitoring a resource including control information.

[0392] Specifically, the circuit determines that control information other than the WUS and the wake-up information is to be received based on a second offset; and the second offset indicates one of: (i) an offset between the wake-up information and a resource including the control information, or (ii) a minimum offset at which the user equipment starts monitoring the resource including the control information; and the second offset is preconfigured or received within the wake-up information.

[0393] 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).

[0394] According to an eighth aspect provided in addition to any one of the first to seventh aspects, the wake-up information includes one or more of the following:

[0395] -PDCCH search space configuration,

[0396] - Discontinuous Reception (DRX) configuration,

[0397] - Bandwidth Part (BWP) configuration,

[0398] - beam index configuration,

[0399] - Channel State Information Reference Signal (CSI-RS) configuration,

[0400] - MIMO layer number used to send or receive data,

[0401] - the ratio of the energy per resource element (RE) carrying the WUS to the energy per RE carrying reference signals that can be used to demodulate the PDCCH, and

[0402] - The ratio of the energy per RE carrying the synchronization signal to the energy per RE carrying the reference signal that can be used to demodulate the PDCCH.

[0403] According to a ninth aspect provided in addition to any one of the first to eighth aspects, detecting the presence of the WUS is performed on a preconfigured subset of the configured system component carriers.

[0404] According to a tenth aspect provided in addition to any one of the first to eighth aspects, detecting the presence of the WUS is performed on all configured system component carriers.

[0405] According to an eleventh aspect provided in addition to any one of the first to tenth aspects, the WUS includes one or more of the silent resource elements.

[0406] According to the twelfth aspect provided in addition to the twelfth aspect, the WUS includes a predefined sequence of one or more silent resource elements and one or more non-silent resource elements, and at least one of the following applies: (i) the WUS includes a predefined sequence of silent resource elements and non-silent resource elements in the time domain of the time-frequency resource grid; (ii) the WUS includes a predefined sequence of silent codewords and non-silent codewords in the time domain, and each of the codewords corresponds to multiple resource elements associated with the same time and multiple subcarriers in the time-frequency resource grid of an orthogonal frequency division system; (iii) the WUS includes a predefined sequence of silent and non-silent resource elements in the frequency domain of the time-frequency resource grid.

[0407] According to a thirteenth aspect, there is provided a network node comprising a circuit that: (i) determines whether a user equipment (UE) is to receive control information different from a preconfigured wake-up signal (WUS) and wake-up information; and (ii) includes the WUS in a wireless signal, the WUS being followed by the wake-up information, upon determining that the UE is to receive the control information, and a transceiver that sends the wireless signal.

[0408] According to a fourteenth aspect, a method for execution at a user equipment (UE) is provided, the method comprising: receiving a wireless signal; detecting the presence of a wake-up signal (WUS) in the received wireless signal; based on the WUS, determining wake-up information according to the received wireless signal, and based on the wake-up information, determining to receive control information other than the WUS and the wake-up information.

[0409] According to a fifteenth aspect, a method performed at a network node is provided, the method comprising: determining, based on wake-up information, whether a user equipment (UE) is to receive control information different from a preconfigured wake-up signal (WUS) and the wake-up information; and in a case where it is determined that the UE is to receive the control information, including the WUS in a wireless signal, following the WUS with the wake-up information, and sending the wireless signal.

[0410] According to another aspect, an integrated circuit is provided, which is configured to: detect the presence of a wake-up signal (WUS) in a received wireless signal; (ii) determine wake-up information based on the received wireless signal 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 can implement the circuit 1330 of the UE mentioned above.

[0411] According to another aspect, an integrated circuit is provided, which is configured to: (i) determine whether a user equipment (UE) is to receive control information different from a preconfigured wake-up signal (WUS) and wake-up information; and (ii) if it is determined that the UE is to receive the control information, include the WUS in a wireless signal, with the wake-up information following the WUS. The IC may implement the circuit 1380 of the network node mentioned above.

[0412] Also provided is an integrated circuit configured to control a communication device to perform the method according to the fifteenth aspect, and an integrated circuit for controlling a base station to perform the communication method according to the sixteenth aspect.

[0413] Furthermore, a non-transitory medium storing program instructions is provided, which, when executed on a processing circuit such as a general-purpose processor, causes the processing circuit to perform all the steps of the above-mentioned method embodiments or aspects.

Claims

1. A user equipment UE, comprising: a transceiver, the transceiver receiving a wireless signal; and Circuit, the circuit: o Detecting whether there is a preconfigured wake-up signal WUS in the received wireless signal, wherein the WUS includes one or more silent resource elements, and o In case the presence of the WUS is detected, it is determined that the user equipment is to receive a control signal different from the WUS.

2. The user equipment according to claim 1, wherein: The WUS includes a predefined sequence of one or more silenced resource elements and one or more un-silenced resource elements.

3. The user equipment according to claim 2, wherein: The WUS includes a predefined sequence of muted resource elements and non-muted resource elements in the time domain of a time-frequency resource grid.

4. The user equipment according to claim 2 or 3, wherein: The WUS includes a predefined sequence of silent symbols and non-silent symbols in the time domain, Each of the symbols corresponds to a plurality of resource elements associated with the same time and a plurality of subcarriers in a time-frequency resource grid of an orthogonal frequency division system.

5. The user equipment according to any one of claims 2 to 4, wherein: The WUS includes a predefined sequence of muted resource elements and non-muted resource elements in the frequency domain of a time-frequency resource grid.

6. The user equipment according to any one of claims 2 to 5, wherein: The predefined sequence is one of a plurality of predefined sequences corresponding to the WUS; and Each of the plurality of predefined sequences is associated with a respective content of control information.

7. The user equipment according to claim 6, wherein: The control information indicates one or more of the following: -Cell ID, -UE Group ID, -UE ID, - an offset after which the user equipment is to monitor signals other than the WUS, and - The user equipment is to start monitoring the system synchronization signal and / or the physical downlink control channel PDCCH.

8. The user equipment according to any one of claims 1 to 7, wherein: The control signal different from the WUS includes a synchronization signal and / or system information and / or a PDCCH.

9. The user equipment according to any one of claims 1 to 7, wherein: Determining that the user equipment is to receive a control signal different from the WUS includes: receiving control information via the transceiver in resources determined based on the position of the WUS, the control information indicating whether to receive one or more of synchronization signals, system information and PDCCH and / or in which resources to receive one or more of synchronization signals, system information and PDCCH.

10. The user equipment according to claim 9, wherein: The resources carrying the control information are located within a preconfigured time domain offset relative to the location of the WUS.

11. The user equipment according to any one of claims 1 to 10, wherein: The circuit performs: o a measurement of interference based on power received in the one or more silent resource elements, and / or o Use the one or more non-muted resource elements as reference signals for measurement of reference signal received power RSRP or reference signal received quality RSRQ.

12. The user equipment according to any one of claims 1 to 11, wherein: The WUS is different for different wireless cells.

13. A network node, comprising: Circuit, the circuit: determining whether the user equipment UE is to receive a control signal different from the preconfigured wake-up signal WUS, and In case it is determined that the UE is to receive the control signal, including the WUS in a wireless signal, wherein the WUS includes one or more silent resource elements; and A transceiver is used to transmit the wireless signal.

14. A method performed at a user equipment UE, the method comprising: Receive wireless signals, detecting whether there is a preconfigured wake-up signal WUS in the received wireless signal, wherein the WUS includes one or more silent resource elements, and In case that the existence of the WUS is detected, it is determined that the user equipment is to receive a control signal different from the WUS.

15. A method for execution at a network node, the method comprising: determining whether the user equipment UE is to receive a control signal different from the preconfigured wake-up signal WUS, In case that it is determined that the UE is to receive the control signal, the WUS is included in a wireless signal, wherein the WUS includes one or more silent resource elements, and The wireless signal is transmitted.

16. An integrated circuit, the integrated circuit causing a terminal device to perform the following steps: Receive wireless signals, Detecting whether there is a preconfigured wake-up signal WUS in the received wireless signal, wherein: The WUS includes one or more silent resource elements, and In case that the existence of the WUS is detected, it is determined that the user equipment is to receive a control signal different from the WUS.

17. An integrated circuit, the integrated circuit causing a base station to perform the following steps: determining whether the user equipment UE is to receive a control signal different from the preconfigured wake-up signal WUS, In the case where it is determined that the UE is to receive the control signal, the WUS is included in a wireless signal, wherein: The WUS includes one or more silent resource elements, and The wireless signal is transmitted.

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