POWERSAVING SIGNAL AND PROCEDURE DESIGN
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`BACKGROUND
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`1.
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`Technical Field
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`The present disclosure relates to transmission and reception of signals in a
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`communication system. In particular, the present disclosure relates to methods and
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`apparatuses for such transmission andreception.
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`2.
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`Description of the Related Art
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`Currently, the 3rd Generation Partnership Project (3GPP) worksat the next release
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`(Release 15) of technical specifications for the next generation cellular technology, which
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`is also called fifth generation (5G) also including “New Radio” (NR) radio access
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`technology (RAT), which operates in frequency ranges up to 100 GHz. The NR isa
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`follower of the current technology represented by Long Term Evolution (LTE) and LTE
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`Advanced (LTE-A). The NR is planedto facilitate a single technical framework
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`addressing all usage scenarios, requirements and deploymentscenarios defined including,
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`for instance, enhanced mobile broadband (eMBB), ultra-reliable low-latency
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`communications (URLLC), massive machine type communication (mMTC)andthelike.
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`For example, eMBB deployment scenarios may include indoorhotspot, dense urban,rural,
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`urban macro and high speed; URLLC deploymentscenarios may include industrial control
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`systems, mobile health care (remote monitoring, diagnosis and treatment), real time control
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`of vehicles, wide area monitoring and control systems for smart grids; mMTC mayinclude
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`scenarios with large numberof devices with non-timecritical data transfers such as smart
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`wearables and sensor networks. The services eMBB and URLLCaresimilar in that they
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`both demand a very broad bandwidth, howeverare different in that the URLLC service
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`requires ultra-low latencies. Physical layer is based on time-frequency resources (such as
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`Orthogonal Frequency Division Multiplexing, OFDM in LTE) and maysupport multiple
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`antenna operation.
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`For systems like LTE and NR, further improvements and options may facilitate
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`efficient operation of the communication system as well as particular devices pertaining to
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`the system.
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`BRIEF SUMMARY
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`One non-limiting and exemplary embodimentfacilitates providing an efficient
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`scheduling, in particular in terms of power consumption at the terminal and in terms of
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`service latency.
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`In one general aspect, the techniques disclosed here feature; a mobile device,
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`comprising: a transceiver, which, in operation, receives and/or transmits a signal and a
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`circuitry, which, in operation: (i) monitors a signal in a first set of resources, and (11) when
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`the monitored signal includes identification of the mobile device and an indicator having a
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`first value, controls the transceiver: to receive or transmit signal on a second set of
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`resources andto, after a time period indicated in the monitored control signal, not receive
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`or transmit signal on a secondset of resources and monitor the control signal in thefirst set
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`of resources.
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`It should be noted that general or specific embodiments may be implementedas a
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`system, a method, an integrated circuit, a computer program, a storage medium, or any
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`selective combination thereof,
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`Additional benefits and advantages of the disclosed embodiments will become
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`apparent from the specification and drawings. The benefits and/or advantages may be
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`individually obtained by the various embodiments andfeatures of the specification and
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`drawings, which neednotall be provided in order to obtain one or more of such benefits
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`and/or advantages.
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`BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
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`In the following exemplary embodiments are described in more detail with
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`reference to the attached figures and drawings.
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`Figure 1 shows an exemplary architecture for a 3GPP NR system including
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`exemplary user and control plane architecture for the LTE eNB, gNB, and UE.
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`Figure 2 is a block diagram illustrating an exemplary structure of a terminal and a
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`base station.
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`Figure 3 is a block diagram illustrating structure of circuitries for transmission and
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`reception of a powersaving signal as well as behaviorrelated thereto.
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`Figure 4 is a schematic drawingillustrating an example of a power saving signal
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`and its influence on scheduling a physical control channel.
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`Figure 5 is a schematic drawingillustrating another example of a power saving
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`signal and its influence on scheduling a physical control channel.
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`Figure 6 is a schematic drawingillustrating an example of a power saving signal
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`and its influence on scheduling a physical data channel.
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`Figure 7 is a schematic drawingillustrating another example of a power saving
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`signal and its influence on scheduling a physical data channel.
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`Figure 8 is a flow diagram illustrating an exemplary method for transmission and
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`reception of a powersaving signal and a behavior possibly associated therewith.
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`DETAILED DESCRIPTION
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`Figure 1 shows an exemplary example of a communication system including a base
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`station and a terminal and a core network. Such communication system may be a 3GPP
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`system such as NR and/or LTE and/or UMTS. For example, asillustrated in Figure 1, the
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`base station (BS) may be a gNB (e.g., an NR gNB) or an eNB (e.g., an LTE). However,
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`the present disclosure is not limited to these 3GPP systems or to any other systems. Even
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`though the embodiments and exemplary implementations are described using some
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`terminology of 3GPP systems, the present disclosure is also applicable to any other
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`communication systems, and in particular in any cellular, wireless and/or mobile systems.
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`A terminal is referred to in the LTE and NR as a user equipment (UE). This may be
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`a mobile device such as a wireless phone, smartphone, or an USBstick with the
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`functionality of a user equipment. However, the term mobile deviceis not limited thereto,
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`in general, a relay may also have functionality of such mobile device, and a mobile device
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`may also work asarelay.
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`Basestation is a network node, e.g., forming a part of the network for providing
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`services to terminals. Base station is a network node, which provides wireless access to
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`terminals.
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`In LTE as well as in NR, Radio Resource Control (RRC) protocol is used between
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`the base station (eNB, gNB) and the terminal (UE) for configuration. RRC is a control
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`protocol, which resides over physical and MAC layer. RRC defines for UE variousstates
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`according to the transmission/reception behavior. For example, the RRC_CONNECTED
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`state means, among others, that the UE has an established radio access bearer and can
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`transmit and/or receive data. On the other hand, RRC_IDLE mode means, amongothers,
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`that a UE doesnot have a radio access bearer configured but may have signaling radio
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`bearer established.
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`The present disclosure provides approaches, which mayfacilitate an efficient power
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`saving for a mobile terminal and, in particular power saving in relation with
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`communication between the mobile terminal and a base station.
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`In the LTE,efficiency of powerutilization is increased by applying Discontinuous
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`Reception (DRX). The DRX is a way to shorten the active period in RRC_CONNECTED
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`mode without scheduling grant. In particular, by means of timers, which may be
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`configured by an eNB, the UE is capable of operating in an active mode in whichit
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`monitors PDCCHand in a DRX mode, in which the reception is switchedoff.
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`However, the DRX mechanism provides ON durations (in which a PDCCHis
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`monitored) and OFF mode (in which no PDCCHis monitored). The starting time and
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`duration of the ON time (and thus also OFFtime) is configured by the RRC, which means
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`that it is not dynamic, but at most semi-static. Dynamic change means change with
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`scheduling frequency, e.g., with the scheduling grants. Semi-static may still mean change
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`during communication connection, e.g., by the RRC, but RRC configurationsare less
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`frequent than scheduling grants. Since in DRX, PDCCHcannot be monitored during the
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`OFF durations, service latency may be increased, which maybe less effective for some
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`particular, delay-sensitive services. In other words, since in OFF mode, the UE doesnot
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`monitor PDCCH,if traffic arrives, the UE cannotbe scheduled until the next ON duration.
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`Consequently, low latency requirements may not be guaranteed for someservices. If the
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`DRX ONduration periodicity is configured with a short value, the power consumption will
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`increase due to the increased monitoring of the PDCCH. Even in case in which there is no
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`traffic at all, the UEstill needs to turn on to monitor PDCCH,whichresult in wasting of
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`power. In summary, DRX does not provide a good trade-off between the power saving and
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`the service latency. On the contrary, DRX maylead to long waiting time whentraffic
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`arrives and unnecessary power wasting when notraffic arrives.
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`Some exemplary embodiments of the present disclosure mayfacilitate providing a
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`more dynamic, efficient, and/or UE-specific power adaption, possibly aligned with the
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`traffic characteristics such as traffic arrival timing and pattern.
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`For instance, UE may monitor control information relating to a powersaving (e.g.,
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`the PoSS) in a first mode in limited resources (indicated by a higher layer signaling), and
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`UE turns into a second mode when UE detect the control information in a first mode, UE
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`stay in the first mode when UE doesnot detect the control information in the first mode.
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`The control information includes information relating to a length of the second mode, and
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`UE turns from the second modebackto the first mode based on the length of the second
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`mode.
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`An example of such mobile device 210 is shown in Figure 2. Figure 2 illustrates a
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`general, simplified and exemplary block diagram of the user equipment 210 (also termed
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`communication device) and a scheduling device 250 which is here exemplarily assumed to
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`be located in the basestation, e.g., the eLTE eNB (alternatively termed ng-eNB) or the
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`gNB in 5G NR).However, in general, a scheduling device mayalso be a terminal in case of
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`a side-link connection between two terminals. The UE and eNB/gNB are communicating
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`with each other over a (wireless) physical channel 290 respectively using their transceivers
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`220 (UE side) and 260 (base station side). Together, the base station 250 and the terminal
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`210 form a communication system 200.
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`The communication device 210 may comprise the transceiver 220 and a
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`(processing) circuitry 230. The transceiver 210 in turn may comprise and/or function as a
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`receiver and/or a transmitter. The circuitry may be one or more pieces of hardware such as
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`one or more processors or any LSIs. Between the transceiver and the processing circuitry
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`there is an input/output point 225, 265 (or node) over which the processing circuitry, when
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`in Operation, can control the transceiver, i.e., control the receiver and/or the transmitter and
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`exchange reception/transmission data. The transceiver, as the transmitter and receiver, may
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`include the RF (radio frequency) front including one or more antennas, amplifiers, RF
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`modulators/demodulators and the like. The processing circuitry may implement control
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`tasks such as controlling the transceiver to transmit user data and control data provided by
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`the processing circuitry and/or receive user data and control data that is further processed
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`by the processing circuitry. The processing circuitry may also be responsible for
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`performing other processes such as determining, deciding, calculating, measuring, etc. The
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`transmitter may be responsible for performing the process of transmitting and other
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`processesrelated thereto. The receiver may be responsible for performing the process of
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`receiving and other processesrelated thereto.
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`According to an embodiment, a terminal corresponds to communication device 210
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`and comprises: a transceiver 220, which, in operation, receives and/or transmits a signal
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`and a circuitry. The circuitry 230, in operation monitors a signal in a first set of resources
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`and, when the monitored signal includes identification of the mobile device and an
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`indicator havingafirst value, controls the transceiver: to receive or transmit signal on a
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`second set of resources and to, after a time period indicated in the monitored control signal,
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`not receive or transmit signal on a secondset of resources and monitor the control signal in
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`the first set of resources.
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`According to an embodiment, a network node corresponds to communication
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`device 250 and comprises: a transceiver 260, which, in operation, receives and/or transmits
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`a signal; and a circuitry 270, which, in operation: transmits a signal in a first set of
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`resources, and when the monitored signal includes identification of a mobile device and an
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`indicator havingafirst value, controls the transceiver: to receive or transmit signal on a
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`secondset of resources and to, after a time period indicated in the transmitted control
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`signal, not receive or transmit signal on a secondset of resources and transmit the control
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`signal in the first set of resources.
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`Moreover, Figure 3 shows a moredetailed structure of the mobile device and a
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`network node such as a basestation according to an exemplary implementation. A
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`circuitry 301 may be used in a terminal. It includes a circuitry for PoSS detection 310, a
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`circuitry 320 for controlling reception or transmission of a data channel, and a circuitry 330
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`for switching betweenthe first mode and the second mode,i.e., between the PoSS detection
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`performed by circuitry 310 and the data channel reception or transmission performed by
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`the circuitry 320. A circuitry 305 may be used in a basestation. It includes a circuitry for
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`PoSS transmission 350 to a terminal, a circuitry 360 for controlling reception or
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`transmission of a data channel for the terminal, and a circuitry 370 for switching between
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`the first mode and the second modefor a terminal, i.e., between the PoSS transmission
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`performed by circuitry 350 and the data channel reception or transmission performed by
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`the circuitry 360.
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`The above mentioned time period(s) in which the terminal monitors the first set of
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`resources may be referred to as power saving period(s) and the terminal’s state during such
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`period(s) may be referred to as power saving mode, for the purpose of an easier
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`description. Moreover, the above-mentioned time period(s) indicated in the monitored
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`control signal may be referred to as active period(s) and the terminal’s state during such
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`period(S) may be referred to as active mode.
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`In other words, according to some embodiments, a terminal can operate in two
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`mutually exclusive modes, a power saving mode and an active mode. In the powersaving
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`mode, the terminal monitors power saving signal (PoSS) but does not monitor regular
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`PDCCH.In the active mode, the terminal monitors regular PDCCH. The term “regular”in
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`this context means the PDCCHsuch as the one in LTE and Release 15 NR.
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`Since monitoring of PDCCH consumes some power, by providing mode in which
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`PoSS is monitored but not the PDCCH mayfacilitate some powersaving in particular for
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`cases in which monitoring of the second set of resources is more power-consuming than
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`monitoring ofthe first set of resources. For example, the power consumption for
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`monitoring PoSS may be smaller than the power consumption for monitoring PDCCH.
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`This is the case, for instance, when the PoSS is provided less decoding candidates to be
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`monitored and/or if PoSS uses a narrower bandwidth than the PDCCH. In other words,
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`power savings maybe achievedif there are less blind decodings.
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`The PoSS is located within the first set of resources which are monitored. Thefirst
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`set of resources may be given by one or moreslot(s) and/or one or more symbol(s) in the
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`time domain andby a one or more physical resource block(s) and/or one or more
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`subcarrier(s) in the frequency domain. However, the present disclosureis not limited
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`thereto and the first set of resources may further be defined, in addition or alternatively to
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`the above examples, by a code (e.g., a scrambling or spreading sequence) and/or antenna
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`port and/or one or more index of sequence ID or device ID. Thefirst set of resources may
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`be defined as a periodic pattern in the resources of the system (e.g., periodic in time and/or
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`frequency domain). The period and the length of the signal may be specified (e.g., in time
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`and/or frequency domain). Thefirst set of resources may be predetermined, e.g., by a
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`standard as fixed or depending on sometransmission and/ortraffic parameters.
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`Alternatively, or in addition, the first set of resources may be configurable, e.g., via
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`signaling such as RRC protocol.
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`In an example, a configuration of the limited resources in the power saving mode
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`may be defined with somerelative offset to some synchronization or reference signals. In
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`particular, the first resource set is located in a fixed distance or a distance configured by
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`radio resource control protocol from resourcesallocated for a synchronization signal or a
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`reference signal. When looking at LTE or NR terminology,for instance, the first set of
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`resources may be configuredrelatively to the location of the Synchronization Signal
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`Block(s), SSBs, and/or Tracking Reference Signal(s), TRSs, and/or to Channel State
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`Information Reference Signal(s), CSI-RS. SSB may be usedfor the purpose of
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`synchronization with a particular base station, TRS for tracking the synchronization
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`including also phase, and CSI-RSfor the purpose of measuring channel quality by the
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`terminal and providing the measured quality as a feedback on channel quality to the base
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`station.
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`The distance to the synchronization signal and/or the reference signal may be
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`variable in dependency of transmission and/ortraffic parameters or configurable by
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`signaling such as RRC signaling. Here, traffic parameters may includethe typeoftraffic
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`and parametersoftraffic such as delay sensitivity, volumeof thetraffic, target quality in
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`terms of an error rate, or the like. Transmission parameters may include parameters such
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`as channel quality, modulation and coding applied, power, numerology,or the like. The
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`relative position mentioned above does not necessarily mean that a PoSS is to be included
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`with an offset to every SSB. The frequency of the PoSS may be equal or less or more than
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`the frequency of the SSB (and/or TRS and/or CSI-RSor any kind of reference signal). The
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`ratio between the frequency of PoSS and a synchronization signal and/or reference signal
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`may be fixed or derivable based on parameters suchastraffic or transmission parameters or
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`the like and/or configurable by some signaling such as RRCsignaling. It is noted that the
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`above examples are not exhausting and that further configurations and parametersare
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`possible.
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`The PoSS may be considered as signal, which, when received by the terminal,
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`causes the terminal to switch from the powersaving modeto the active mode. This may be
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`performed in any way:
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`In a first example, the presence of the PoSS signal in the first set of resources
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`causes the switching of the terminal from the power saving modeto the active mode.
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`Absence of the PoSS signal in the first set of resources causes remaining in the power
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`saving mode. This example provides a very simple, yet efficient switching mechanism. In
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`case the PoSS signalis present, the first set of resources may further include resources for
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`indicating the active period length and possibly further parameters.
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`In a second example, PoSS signal is always transmitted in the PoSS but may take
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`different values. A first value may indicate causes the switching of the terminal from the
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`power saving modeto the active mode. A second value, different from the first value may
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`cause remaining of the terminal in the power saving mode.
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`As mentioned above, out of said active period, in the power saving period,if the
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`monitored control signal includes the indicator having a second value, the processing
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`circuitry may cause the receiver to continue monitoring the control signal in the first set of
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`resources and not receive or transmit signal on a secondset of resources.
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`The secondset of resources includes for instance PDCCHresources. However, the
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`second set of resources is not necessarily limited to the PDCCHresources, it may also
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`include some reference signal resources and/or further signaling resources different from
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`the PDCCHresources such as paging resources.
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`In an exemplary embodiment, in the power saving mode, the terminal monitors only
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`the PoSS (apart from synchronization signals) but no signaling or data. Some reference
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`signals may but does not have to be monitored either. Accordingly, paging channelis not
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`monitored either. In this exemplary embodiment, a very efficient power saving may be
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`facilitated.
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`According to an exemplary embodiment, in the active more, the terminal does not
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`monitor the first set of resources. Since the first resources mayalso define, after obtaining
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`the PoSS with value instructing switching to the active mode, the duration of the active
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`period, monitoring PoSS in active modeis not necessary: the terminal returns to the power
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`saving modeafter the active period. This approach mayfacilitate saving some power and
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`resources also in the active mode.
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`However, the present disclosure is not limited to this embodiment. The PoSS may
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`also be monitored in the first set of resources whenthe terminalis in the active mode.
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`Alternatively, the PoSS signal may be monitoredin a third set of resources same or
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`different from the secondset of resources but different from the first set of resources. In
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`any case, the present disclosure also provides an embodiment in whichthefirst set of
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`resources mayinclude PoSS butnot an indication of the active time period. In such case,
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`PoSS signal in active modeis used to switch the terminal from the active modeto the
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`power-saving mode. It is noted that a first value of PoSS may be used to switch from the
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`power saving modeto the active mode while a second value of PoSS may be used to switch
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`from the active mode to the power saving mode again. Thefirst and the second values of
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`the PoSS signal differ.
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`In other words, in an exemplary embodiment, the circuitry, in operation, when the
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`mobile device is in the second (active) mode, monitors the control signal in the first set of
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`resources and sets the mobile device into the first mode after a power-saving period when
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`the monitored control signal includes the indicator (PoSS) having the secondvalue.
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`Someofthe benefits of providing the PoSS signal in the power saving mode are
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`facilitated in that both shorter latency and power saving can be provided. Whentraffic
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`arrives, the terminal can be scheduled timely. The power consumption may be lowersince
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`the monitoring of the PoSS may consumeless power. If there is no traffic in long time
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`period, just monitoring PoSS may consumeless power than PDCCHblind decoding in a
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`DRX ONduration.
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`In the context of the DRX applied in the RRC_CONNECTED mode,the above
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`embodimentsstill monitor PoSS in the power saving mode, whereas in DRX OFF period,
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`no signaling channel is monitored. In the above embodiments, the terminal can return into
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`the active mode, from the power saving mode, dynamically or the terminal may remain in
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`the power saving mode based on the PoSS with a short periodicity. In contrast, in the
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`DRX,the terminal cannot turn into the ON period from the OFF period dynamically, but
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`rather only in the configured timing. Consequently, the traffic adaption capability of the
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`above embodiments and the DRX approachdiffers. In particular, in the above
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`embodiments, the terminal does not haveto go into the active modeifthere is notraffic
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`scheduled, which may facilitate power saving. In contrast, in the DRX approach, even if
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`there is no traffic, the UE is required to go into the ON duration to monitor the (one or
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`more) PDCCH(s) in the configured period, which may lead to power wasting.
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`It is noted that the first mode and the second mode both may be definedin the
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`RRC_CONNECTEDstate of the terminal. However,this is not to limit the present
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`disclosure, and — as will be shown below, embodiments are also envisaged in which the
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`second mode corresponds to the RRC_CONNECTED mode. Thepresent disclosureis
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`even applicable to embodiments in which both the first and the second mode (powersaving
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`and active mode) are in RRC_IDLE mode.
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`In the following, two embodimentsare described: in one of the embodiments, the
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`control information obtained from the first set of resources when detecting the PoSS relates
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`to resource candidates of a control information to monitor (such as PDCCH). In the other
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`embodiment, the control information includes a second resource information relates to
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`resource(s) or resource candidates of a data channel (such as PDSCH or PUSCH). A third
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`embodiment, also described below, envisages to provide in the control information also one
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`or more bits to indicate which ofthe first resource information related to a control channel
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`or a second control information related to a data channelis included in the control
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`information. The one or more bits may be generated with using an VE ID or RNTI.
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`PoSSAccompaniedbyPDCCHOccasions
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`In an exemplary and non-limiting embodiment, upon reception of the PoSS, the
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`terminal transits into the active mode and, upon thetransition, starts monitoring PDCCHto
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`receive the scheduling grant.
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`In other words, the circuitry, in operation, upon setting the mobile device from the
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`first mode to the second mode, determines resource candidates to be monitored(e.g.,
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`search space) on a physical downlink control channel (e.g., PDCCH)for receiving
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`scheduling information (e.g., included in a DCI) based on an indication includedin the
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`monitored control signal and/or the identification of the mobile device. Then the circuitry
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`controls the transceiverto receive (e.g., blindly decode) signal in the resource candidates
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`and based onthe receivedsignal (e.g., DCI including an downlink or uplink grant) in the
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`resource candidates, determines data resources for downlink or uplink data transmission.
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`Finally, the circuitry controls the transceiver to receive (downlink direction) or transmit
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`(uplink direction) data on the determined (e.g., granted) data resources.
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`Thus, in this embodiment, after transition into the active mode, the first resource on
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`which data are to be received or transmitted by the terminal is determined at the terminal
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`based on the PDCCHreception, just as any other resources in the active mode. In
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`particular, after the transition from the power saving modeinto the active mode, the
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`upcoming resource candidates for data scheduling on PDCCHare determined based on an
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`indication within the PoSS following informationin the first set of resources such as
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`CORESETinformation or blind decoding candidates. For example, in PoSS, a limited set
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`of CORESETand/or blind decoding candidates can be indicated to assist terminal
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`reception in the second set of resources. This may save the terminal power consumption
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`when performing PDCCHblind detection. In general, the term CORESETdenotes a
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`control-resource set whichis a set of resources used for control signaling in NR.
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`Alternatively or in addition, the candidates may be determined according to an
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`identification of the terminal. The determination of the blind decoding candidates and/or
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`CORESETand/or search space in the secondset of resources, can be related to/calculated
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`by the ID detected in the PoSS. In other words, the location of the resources may be
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`determined by calculating the location depending on the ID.
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`The signaling information configuring the PDCCH mayinclude indication of
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`minimum and maximum aggregation level, whether the candidates are localized or
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`distributed, transmission parameters for the candidates,etc.
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`Figure 4 illustrates schematically the timing of the power saving mode and active
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`mode, as well as the PoSS and PDCCHresources. In particular, Figure 4 shows an “OFF
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`period” corresponding to the power saving period in whichthefirst set of resources but not
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`20
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`the secondset of resources is monitored. At the PoSS occasion(first set of resource), the
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`PoSS is actually detected and upon the detection, the terminal transits into an “ON period”
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`corresponding to the active mode described above. The ON aswell as OFF periodsare
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`divided into time slots, some of which in the active (ON)period including the PDCCH
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`resources to be monitored by the terminal. In the OFF period, the terminal does not
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`25
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`monitor PDCCH.
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`In Figure 4, the arrows from the PoSS to the PDCCHblind decoding (candidate)
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`resourcesillustrate that the PoSS may also provide an indication of the PDCCHresources.
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`In this example, the PDCCHis monitored in five consecutive timeslots, starting after an
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`offset from the PoSS signal. Here, the offset is zero, i.e., the first PDCCH to be monitored
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`

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`is located in a slot immediately following the slot in which PoSS was located. However,
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`the present disclosure is not limited to such an approach andthe offset in terms of time
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`slots and/or symbols may be non-zero.
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`Figure 5 showsanother exemplary implementation in which the PDCCHis not
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`monitored in each slot after switching from the power saving modeinto the active mode.
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`Rather, the PDCCH is monitored with a frequency, which maybe fixed (e.g., defined in the
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`standard), or variable. The variability may be achieved by a dependencyon other
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`parameters such as numerologyorthe like of configurable by signaling from the base
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`station to the terminal, for example by RRC signaling.
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`10
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`Since the power saving modecan be dynamically terminated by reception of the
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`PoSS,the approach of the present disclosure is more flexible than the DRX. In DRX,
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`when OFFperiodis over, the UE automatically turns into the active mode, no matter
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`whetherthere is an actual traffic for the UE or not.
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`In LTE and in NR, hybrid automatic repeat request (HARQ) is employed to correct
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`15
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`sometransmission errors. A multi-process stop-and-wait HARQis used which, in order to
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`save resources, implicitly determines location of resources for transmission of the
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`acknowledgements (positive or negative, ACK or NACK)based on the location of
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`resourcesallocated (scheduled) for transmission of the data which are being acknowledged.
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`According to an exemplary implementation, in any of the above mentioned
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`20
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`embodiments and examples, once the UE detects the PoSS, the UE transits into the active
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`mode and determines not only the resource candidates for the data scheduling (PDCCH)
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`based on an indication accompanying the PoSS or UE ID butalso the resource for HARQ
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`acknowledgements. In particular, the HARQ feedback resources are determined based on
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`the scheduled PDSCH and PUSCHresources, for example based on the indication within
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`25
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`the PDCCHand/or based on the UE ID. In other words, the indication (and/or the detected
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`ID) in the PoSS can include parameters that is/are used to calculated the HARQ-ACK
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`resource.
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`In other words, in one exemplary implementation, the circuitry, in operation,
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`determines resources for receiving or transmitting of transmission acknowledgements
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`corresponding to the determined data resources based on the indication includedin the
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`monitored control signal and/or the identification of the mobile device.
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`In summary, when UE detects the PoSS in the power saving mode, the UE may
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`determine one or more ofthe following:
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`-
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`Upcoming PDCCHresources (based on the PoSS oran additional indication
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`accompanying the PoSS in the first resources and/or UE identification),
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`-
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`Resources for the HARQ feedback (based on the PoSS or an additional
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`indication accompanying the PoSS in the first resources and/or UE identification),
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`—
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`Timing information for returning back from the active modeinto the power
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`10
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`saving mode.
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`PoSS Accompanied by Data Channel Scheduling
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`In an exemplary and non-limiting embodiment, upon reception of the PoSS, the
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`terminal transits into the active mode and determined the upcomingresource for data on
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`PUSCHand/or PDSCHbasedon an indication in PoSS (or, more generally, based on an
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`indication within the first set of resources) and/or based on a terminal identification.
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`In other words, the circuitry, in operation, upon setting the mobile device from the
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`first mode to the second mode, determines data resources for downlink or uplink data
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`transmission based on an indication included in the monitored control signal and/or the
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`identification of the mobile device, and