WO 2019/192006
`
`PCT/CN2018/082061
`
`Paging occasion design in new radio
`
`7.
`
`Technical field
`
`BACKGROUND
`
`The present disclosure relates to paging of user devices in a communication system.
`
`10
`
`15
`
`20
`
`25
`
`2.
`
`Description of related art
`
`New Radio (NR) is the technology being developed by the 3% Generation Partnership Project
`
`(3GPP) to be submitted to the International Telecommunications Union as a 5G candidate
`
`technology. One of the most notable aspects of NR is the fact that it is being designed taking
`
`into account the operation using beamforming (Dahlman et a/. “4G, LTE-Advanced Pro and
`
`The Road to 5G”, 3rd Ed. Elsevier. 2016), which will be especially useful in high frequency
`
`bands. Broadly speaking, beamforming allows to concentrate the energy of a given radio
`
`transmission in a certain direction, such that the range can be extended to, for instance,
`
`compensate the high propagation loss in high frequencies. Given that 5G is expected to
`
`operate in high frequencies, where more spectrum is available, beamforming operation is key
`
`in NR.
`
`SUMMARY
`
`One non-limiting and exemplary embodimentfacilitates efficient monitoring of paging
`
`messages by a user equipment.
`
`In one general aspect, the techniques disclosed here provide user device for transmitting
`
`and/or receiving data to/from a base station in a communication system comprising circuitry
`
`which, in operation: receives paging occasion configuration from the base station, including at
`
`least one parameter for configuring a predefined time-domain pattern for receiving paging
`
`occasion within a paging cycle; and performs reception of paging signal
`
`in the paging
`
`occasions within the predefined time-domain pattern configured according to the received
`
`paging occasion configuration.
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`It should be noted that 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.
`
`Additional benefits and advantages of the disclosed embodiments will become apparent from
`
`the specification and drawings. The benefits and/or advantages may be individually obtained
`
`by the various embodiments and features of the specification and drawings, which need not
`
`all be provided in order to obtain one or more of such benefits and/or advantages.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`10
`
`Figure 1
`
`is a schematic drawing of the allocation of synchronization blocks in resources.
`
`Figure 2
`
`is an illustration of beamforming performed by a base station.
`
`Figure 3A
`
`is an illustration of the slots for a paging occasion;
`
`Figure 3B
`
`is an illustration of the slots for a paging occasion filled with paging CORESETs;
`
`Figure 4
`
`is a schematic illustration of different NR numerologies and the corresponding
`
`15
`
`SSBs;
`
`Figure 5
`
`is a schematic drawing illustrating different multiplexing patterns;
`
`Figure 6
`
`is a schematic illustration of SSB mappinginto thefirst half-frame;
`
`20
`
`25
`
`Figure 7
`
`is a table exemplifying relation between duration in symbols of RMSI CORESET
`
`and the respective multiplexing pattern for different numerologies;
`
`Figure 8
`
`is an table exemplifying relation between frequency bands, synchronization
`
`signal length and numerology for NR:
`
`Figure 9
`
`is block diagram illustrating an exemplary user device and basestation;
`
`Figure 10
`
`is a schematic drawingillustrating predefined pattern for PO locations, namely
`
`location on a raster and uniformly distributed locations;
`
`Figure 11
`
`is a schematic drawing illustrating location of POs on a raster within a paging
`
`cycle;
`
`Figure 12
`
`is a schematic drawing illustrating location of POs on a raster within a paging
`
`cycle;
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`Figure 13
`
`is a schematic drawingillustrating uniformly distributed PO locations over a
`
`paging cycle;
`
`Figure 14
`
`is a schematic drawingillustrating configuration of PO location.
`
`DETAILED DESCRIPTION
`
`In order to support beamforming operation, several aspects of NR, including functionalities like
`
`time/frequency synchronization and paging, among others, need to be re-designed. This
`
`disclosure regards paging design in NR.
`
`An important functionality in mobile cellular systems (also in NR) is the paging mechanism, by
`
`which the network locates UEs with incoming traffic (voice calls or data). The antenna beams
`
`provide more range (distance between the base station and user device to communicate with
`
`each other) but their coverage is narrower than the conventional tri-sectorial cells. Since
`
`paging is aboutlocalizing a UE within a cell (or group ofcells), paging operation needs to be
`
`adapted to the beam-sweeping operation in NR. Thus, some design principles from LTE can
`
`be inherited in NR but other notions, such as paging occasion definition and paging occasion
`
`resource allocation need to be adapted.
`
`In the context of cellular systems, paging is a mechanism by which the network locates a User
`
`Equipment, UE, (in IDLE mode) within a given geographical area referred to as tracking area,
`
`possibly composedof several cells, to initiate a connection setup. Since the network does not
`
`know the exact geographical position of the UE to be paged, beamformed paging messages
`
`(used in NR) need to be transmitted in different directions at different time instants in order to
`
`guarantee that the UE to be pagedis found. Here, the term “network” mainly refers to a base
`
`station (also referred to as gNB in NR) with which the UE communicates via wireless interface
`
`and which is connected to the rest of the network. The UE is any mobile station implemented
`
`for instance in a terminal such as mobile phone, smartphone, tablet, laptop, PC, or any other
`
`device.
`
`It is noted that the paging design of this dislcosure may be applied to two modesin the NR,
`
`namely to RRC_IDLE state and RRC_INACTIVEstate. These are commonly referred to as
`
`IDLE and INACTIVE modes. These modes apply according to 3GPP TS 38.304 v0.1.2 (2018-
`
`02): when the UE is camped on a NR cell; and when the UE is searching for a cell to camp on.
`
`A UE is camped on a cell if it has completed the cell selection/reselection process and has
`
`chosen a cell. The UE monitors system information and (in most cases) paging information in
`
`these states. The RRC_IDLE state and RRC_INACTIVE state tasks can be subdivided into
`
`10
`
`15
`
`20
`
`25
`
`30
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`three processes: PLMN selection; cell selection and reselection; location registration and RNA
`
`update. Cell selection is only applicable to RRC_IDLEstate.
`
`However, the present disclosure is not limited to the very particular NR states. In general, it is
`
`applicable to any UE state in which the cell broadcast and paging channels are monitored.
`
`This is typically (not only in NR but also in LTE or other systems) the case when there is no
`
`current data bearer configured and no pending communication between the UE and the base
`
`station. If there is an exchange of data and signaling between the UE and base station, then
`
`the control information may also be transmitted over suchlinks, i.e. faster than monitoring the
`
`paging channel. In the following, when referring to IDLE_MODE, any idle mode such as the
`
`NR modes mentioned above is meant. Thus, an IDLE UE is any UE in an IDLE_MODE.
`
`The overall paging design and operation comprises two interconnected problems:
`
`1) PO structure design. This is about determining the length and composition of each
`
`individual paging occasion. In LTE, the notion of PO refers to both paging frame and
`
`subframe in which a given UE has to monitor paging Downlink Control Information
`
`(DCI).
`
`In NR, the PO has been agreed to be composed of one or more slots which
`
`duration is such that a complete beam sweeping of paging signals can be allocated.
`
`Indeed, each PO must contain one CORESET associated (and quasi-colocated) to
`
`each SSB. Thus, with a variable number of beams in a cell, the length of POsis also
`
`variable and would depend on the maximum number of Synchronization Blocks
`
`(SSBs), i.e., the parameter L which in turn depends on the numerology, or the number
`
`of actually transmitted SSBs, let’s say a variable L’ < L. In addition, for a given L,it is
`
`also possible to take several approaches. For instance, a certain L-specific length
`
`allowing blanks within the PO in time-positions where SSBs are not transmitted or using
`
`a length that directly depends on the numberof actually transmitted SSBs (L?. In any
`
`case, variable length PO needs to be considered in NR, and hence, the next problem,
`
`that of allocation of POs must take this factor into consideration.
`
`2) PO allocation. This is about the allocation of the different POs within the system's
`
`paging cycle. In LTE, system’s paging cycle is indicated as system information and it
`
`is assumedas default by UEs unless UE-specific configuration (UE-specific DRX cycle)
`
`is provided. Then, UEs are distributed among the different POs by means of mod-type
`
`operations, while the number of POs dependson the paging-load and can be modified.
`
`The same principles apply to NR, however, there are some important differences.
`
`Paging CORESET has been agreed to reuse the same configuration as RMSI
`
`CORESET, which means that paging CORESETS at
`
`least for RRC_IDLE are
`
`transmitted within the initial active downlink bandwidth part (:AD_BP). This bandwidth
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`part may or may not overlap with the bandwidth in which SSBs are transmitted, and
`
`hence, collisions between CORESETs and SSBs (and among different CORESETs)
`
`must be avoided. All
`
`in all, the PO allocation strategy should flexible enough to be
`
`applied and adapted to several other cell-specific configurations, such as the SSB-
`
`CORESETmultiplexing pattern (pattern 1, 2, or 3, see [3]), or SSB periodicity.
`
`A similar behaviour has been already agreed for the synchronization signals providing time
`
`and frequency reference to the UE, i.e., these signals are beam-swept(i.e., transmitted on
`
`different beams in different time instants) in the cell in such a way that UEs can access the
`
`system after obtaining the time-frequency reference and some other information from the so-
`
`10
`
`called Synchronization Signal Blocks (SSBs).
`
`15
`
`20
`
`25
`
`30
`
`The term “pre-synchronization” refers to a design principle that has been discussed in some
`
`standardization meetings. Especially for fast moving UEs in IDLE_MODE, it is desirable or
`
`even necessary to receive the synchronization block before attempting to receive and decode
`
`the paging occasion. As the UE is moving fast, time and frequency reference is potentially
`
`degraded, so |DLE UEs would needto “update” (re-sync) before receiving the paging. Hence,
`
`having the POs after SSBsis just desirable.
`
`Hence, given that SSBs and paging signals present a similar behaviour, i.e., both need to be
`
`beam-swept, it is expected that certain associations or relationships can be exploited. SSBs
`
`are blocks of resources consisting of a predetermined number of symbols in time domain, for
`
`instance four symbols, and a predetermined number of subcarriers or physical resource
`
`blocks. The number of symbols and/or sub-carriers or physical resource blocks may be defined
`
`in a standard or configurable in
`
`system resources. The SSB may carry Primary
`
`Synchronization Signal (PSS), Secondary Synchronization Signal (SSS) and the Physical
`
`Broadcast Channel (PBCH).
`
`With respect to LTE, one fundamental change in NR is the fact that, due to beam-seeping
`
`operation, the length in term of OFDM symbols orslots is not fixed because a PO has to contain
`
`as many paging COnfiguration REsource SETs (CORESETS) as synchronization blocks
`
`(beams). In addition, paging CORESETs(as well as Remaining Minimum System Information,
`
`RMSI, and Other System Information, OSI) are to be confined within a certain specific
`
`bandwidth portion called Initial Active Downlink Bandwidth Part ([AD_BP). The bandwidth to
`
`be used for the synchronization blocks may or may not overlap with the IAD_BP. In case of
`
`overlapping, collisions are not allowed in general. Thus,
`
`the problem of paging occasion
`
`allocation, that of determining the time and frequency resources for the paging CORESETis
`
`not
`
`trivial, and a unified framework (i.e., applicable to all
`
`relevant paging-affecting
`
`35
`
`configurations) for NR is encouraged.
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`This disclosure provides several strategies to address the aforementioned problem by
`
`providing a common framework that allows gNBs to flexibly allocate the POs taking into
`
`account other operator-defined configurations, such as the number of SSBs, the multiplexing
`
`pattern, system numerology, and so on. The allocation strategies also allow avoiding collisions
`
`among control signals, while maintaining the required common control signaling overhead
`
`(system information) acceptable and without need for additional UE-specific signaling, except
`
`for cases where UE-specific configuration is required.
`
`This disclosure relates to on-going work item on NR access technology (RP-171418 —
`
`“Revision of WI: New Radio Access Technology”, S. Y. Lien, S. L. Shieh, Y. Huang, B. Su, Y.
`
`L. Hsu and H. Y. Wei, "5G New Radio: Waveform, Frame Structure, Multiple Access, and Initial
`
`Access," in /EFF Communications Magazine, vol. 55, no. 6, pp. 64-71, 2017). It is relevant to
`
`the “initial access” framework. Initial access includes, among other things, synchronization
`
`signals and paging design.
`
`In particular, some embodiments provide mechanisms by which
`
`paging messages are embeddedinto the resources of the NR system, to make moreefficient
`
`the paging reception at UE side. However,
`
`the present disclosure is not limited to being
`
`employed in the NR and mayreadily be applied to other mobile and/or cellular communication
`
`systems in which the UE hasto be paged.
`
`The following points summarize the paging operation in the predecessor Long Term Evolution
`
`(LTE) system, and highlight the similarities and differences in NR.
`
`—
`
`Paging is used to locate UEsin the tracking area, to initiate a setup connection, when
`
`UE is in IDLE mode. Therefore, in the LTE, a paging message is broadcasted in each
`
`cell of the tracking area. This operation based on tracking areas is similar in the NR.
`
`—
`
`InLTE, to receive paging messages, a mechanism similar to data transmission is used:
`
`a UE first receives and monitors control information (L1/L2 signaling meaning layer 1 /
`
`layer 2 signaling which refers to physical layer and MAC layer) to know where and
`
`when the actual paging message is transmitted. Hereafter, this L1/L2 signaling and the
`
`actual paging message are referred to as paging DCI (Downlink Control Information)
`
`and paging message, respectively. DCls are carried on a Physical Downlink Control
`
`Channel (PDCCH). This behavior is also adopted in the NR, at least as baseline.
`
`Moreover, in the context of the NR, the paging DCI is contained in a set of resources
`
`generally called CORESET. Thus, the UE needs to locate and receive the paging
`
`CORESETin order to receive the paging message. In other words, CORESETis a set
`
`of time-frequency resources where a UE monitors PDCCH (DCI) reception.
`
`10
`
`15
`
`20
`
`25
`
`30
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`In the LTE, the paging DClI/message are broadcasted in the cells of the tracking area,
`
`while in the NR, beam operation is supported in general,
`transmitted in different directions in different time slots.
`
`i.e., paging messages are
`
`In order to allow an energy-efficient operation in the LTE, the IDLE mode UEssleep
`
`most of the time, and wake up only whenthey are potentially paged. The time-instances
`
`in which UEs can be paged are called Paging Occasion (PO), and hence, a paging
`
`cycle is defined. By means of predefined formulas, using the UE ID and other
`
`parameters, each UE determines when, i.e., the PO (frame and subframe),
`
`it must
`
`monitor paging. Hereafter,
`
`this is referred to as PO calculation.
`
`In the NR, similar
`
`behavior is expected, although with some differences. The UEs also determine the
`
`time-location of their corresponding PO, i.e. from the UE perspective a particular PO
`
`among the POs in the paging cycle for which the reception is performed by the UE,
`
`using a predefined formula, and monitor such POs periodically. To support beam
`
`sweeping operation, PO is defined as a time interval, possibly composed of several
`
`time-slots (in which all the required beams are transmitted). Thus, in principle, the UE
`
`listens during the whole POinterval to verify whether a paging message,relevanttoit,
`has been sent.
`
`In LTE, PO indicates a frame and a subframe in which the paging DCI
`
`is possibly
`
`transmitted (using a reserved ID: P-RNTI,
`
`i.e. Paging Radio Network Temporary
`
`Identifier which is a group ID).
`
`In the NR, the operation is more flexible. The paging
`
`CORESETcan be transmitted in different OFDM symbols (hereafter referred to as
`
`symbols) within the slot, and its duration is also variable,
`
`i.e., paging CORESET
`
`duration can be one or more symbols. Thus, to indicate a UE the exact time-location of
`
`the paging CORESETto be monitored, an indication with resolution of symbols is
`
`required. The slots are composed of 14 symbols in the time domain. Paging message
`
`details are defined in 3GPP TS 36.331, Section 6.2.2, version f.1.0 or TS 38.331, v.
`
`15.1.0. In the NR, a time-structure similar to the LTE is adopted, but with differences
`
`due to the use of different numerologies. The (radio) frame of 10ms is preserved, as
`
`well as the subframes of 1ms; but the numberof slots within the frame depends on the
`
`numerology, thus, for 15KHz we have 1 slots per subframe, for 30 KHz we have 2 slots
`
`per subframe, and so on. The number of OFDM symbols per slots is the same (14)
`
`regardless of the numerology, cf. 3GPP TS 38.211 V15.0.0 (page 8 and 9).
`
`In other words, Paging Occasion is a set of slots (continuous or distributed) in which a UE
`
`monitors paging-PDCCH (also referred to as type-2 PDCCH). A PO is defined as the time
`
`interval over which paging signals are transmitted and, as mentioned, it is composed of one or
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`multiple time-slots. Paging signals include paging DCI and paging message. As described
`
`above, paging DCI is transmitted on type-2 PDCCH, with configuration provided by a higher
`
`layer parameter paging-SearchSpace (higher layer here refers to RRC protocol). Paging
`
`message is transmitted through PDSCH. In principle, the paging DCI and paging message
`
`may be time-division multiplexed and/or frequency-division multiplexed.
`
`The paging cycle is also referred to as discontinuous reception (DRX) cycle in the context of
`
`3GPP specifications such as LTE and NR. It is noted that in general, the paging cycle in which
`
`base station provides paging occasions (referred to as system paging cycle or a paging cycle
`
`from network point of view) may differ from the paging cycle in which a particular one UE
`
`accesses (performs reception for) certain among the POs provided by the network (also
`
`referred to as UE-specific paging cycle, or paging cycle according to point of view of the UE).
`
`The present disclosure is applicable for the system paging cycle which may also correspond
`
`to the UE paging cycle. Moreover, as described later on, embodiments are provided for cases
`
`in which UE-specific paging cycle is provided for a UE.
`
`From UE pointof view, itis one period with POs, which is repeated. Specific values are not yet
`
`set for NR, but particular value is immaterial for the present disclosure which may work with
`
`any value.
`
`It has been discussed that the minimum DRX cycle is 32 frames, i.e. 320ms. The
`
`eNB can configure UE-specific DRX cycle, different from the default system’s paging cycle
`
`whichis informed to UEs as system information.
`
`The period for POs (paging/DRX cycle) may or may not correspond to the period of the SSBs
`
`(Tsss). Tsss is the periodicity with which synchronization blocks are transmitted. This value may
`
`be selected from the following set: {5, 10, 20, ...
`
`, 160} [ms]; with 20ms being the default value
`
`for all the bands; but operator can adjust this value.
`
`Numberof POs denotes the numberof POsin the system’s paging cycle (Nec). Depending on
`
`paging capacity requirements, gNB can configure another suitable Neo. Hence, the numberof
`
`POs could range, for instance, from 32 to 128.
`
`It is possible to page up to 16 UEs per PO
`
`(actual UE IDs are in the paging message). In the paging occasion, if paging CORESETwith
`
`P-RNTI appears, then it indicates to the UE that there is a paging message that the UE need
`
`to decode. How/where the paging message is, is a scheduling matter.
`
`It
`
`is in the paging
`
`messages where UE IDs are usedto distinguish between messagesofdifferent UEs.
`
`As mentioned above, Paging Occasion Calculation (POC) is a mechanism (e.g., formula
`
`and/or algorithm) by which a UE determinesthe ordinal of the PO it belongs to. Parameters to
`
`the POC may include UE identity (e.g., IMSI, International Mobile Subscriber Identity) and
`
`10
`
`15
`
`20
`
`25
`
`30
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`some system parameters (e.g., 7B which is a number of POs per paging cyclein the LTE and
`
`may also be applied in NR or another system).
`
`One key aspect of the NR is the support for beamforming based operation. One important
`
`function in cellular system is to provide a reliable time-frequency reference for the UEs. While
`
`in LTE the signal used for this purpose is broadcasted in the cell, in the NR, this signal needs
`
`to be transmitted in different directions (beams) at different time instants. Thus, SSBs are
`
`defined containing time-frequency reference and information to allow a UE to access the
`
`system. Since the SSBs are respectively transmitted in all directions, it is possible, in principle,
`
`for a UE to catch, i.e., to be able to successfully receive, at least one of those time-multiplexed
`
`SSBs, and eventually access the system. Hence, a UE is self-located by means of the SSBit
`
`receives. Since 1) these signals are monitored periodically for other purposes, e.g., radio
`
`resource management, and 2) in principle even IDLE UEs can always determine the SSB they
`
`belong to,
`
`then it
`
`is possible to use this knowledge to locate the corresponding paging
`
`CORESETwithin the PO, as long as some association exists, and it is signaled to or known
`
`by the UEs. A PO contains paging CORESETscorrespondingto all the SSBs(i.e. beams) and
`
`its duration corresponds to the period required to beam-sweeping the paging signals.
`
`In the LTE and likely also in the NR, in case ofinitial synchronization (when the UE is not
`
`already camping on or connected to an LTE cell) after detecting the synchronization signals,
`
`the UE decodes the Physical Broadcast CHannel
`
`(PBCH),
`
`from which critical system
`
`information is obtained. In particular, the PSS and SSSare transmitted periodically and enable
`
`the terminal to acquire slot boundary timing. Then, the PBCHof the cell may be read carrying
`
`10
`
`15
`
`20
`
`configuration information. Configuration information may be a common_configuration
`
`information which is to be read by all terminals and/or a group of terminals. This may include
`
`for instance the configuration of the cell resources such as paging resources. The RMS!
`
`(Remaining Minimum System Information) and OSI (Other System Information) are resources
`
`pointed to from the PBCH andalso carrying (cell) broadcast commoninformation to be read
`
`by any terminal in the cell. This information may also carry configuration. The configuration
`
`information may be carried by the resource control protocol (RRC).
`
`Fig.
`
`1 depicts the rationale of using several blocks as a mean for
`
`time/frequency
`
`synchronization in NR. The candidate SSB locations, as well as the total numberof them, may
`
`be provided in the specification and they are numerology-specific, with a maximum of L=64
`
`SSB for subcarrier spacing of 240 KHz. A numerology is defined by subcarrier spacing and
`
`cyclic prefix (CP) overhead.
`
`In Fig. 1, candidate locations are represented as boxes. In this
`
`representation, 5 out of L=8 possible SSB are actually transmitted (indicated by their respective
`
`SSB index, “SSB1”, “SSB2”, etc.) by the network and signaled through RMSI. In general, the
`
`25
`
`30
`
`35
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`base station (referred to in NR as gNB andsimilar to the eNB / eNodeBof LTE) transmits the
`
`different SSBs using different beams in different time-instants to cover the cell/sector, as
`
`illustrated in Fig. 2.
`
`It should be noted that a UE monitors the SSB in order to perform some other functions, e.g.,
`
`Radio Resource Management (RRM) (for instance handover), and hence, UE is aware of the
`
`best received beam. Moreover, since the gNB does not knowthe location of IDLE mode UEs
`
`within a tracking area, paging messagesalso need to be beam-swept, thus a natural design is
`
`to associate the operation of SSB and paging.
`
`A key agreementfor this disclosure among the above agreements states that QCL (Quasi-
`
`colocation) between SSBsand paging (DCl/message) can be assumedby the UEs. The notion
`
`of quasi-co-location (QCL) meansthat, the radio channels experienced by signals transmitted
`
`by different antenna ports have the same large-scale properties (€.g., average delay spread,
`
`Doppler spread/shift, average gain, etc.) if and only if they are quasi-co-located. In practice, it
`
`means that signals corresponding to two different channels (¢.g., SSBs and paging) are
`
`transmitted from the same Transmission and Reception Point (TRP), using the same beam
`
`construction. In other words, each SSB transmitted with a unique index has its corresponding
`
`paging signals transmitted using the same beam. The agreementcreatesa link between each
`
`SSBand the paging messages through QCL. Association between the SSBs and CORESETSs
`
`is to be indicated by means of the RMSI.
`
`Another agreement made so far concernsthe fact that the RMSI, OSI and paging shall share
`
`the same CORESETconfiguration, defined within the I|AD_BP. IAD_BP refers to Initial Active
`
`Downlink Bandwidth Part which is defined as the bandwidth of the RMSI, i.e., by location and
`
`size. Moreover, different multiplexing patterns between the SSBs and RMSI/OSI/paging
`
`CORESETs are to be considered.
`
`Figure 3A shows a PO, whichstarts at the time instant tO and includesslots i-2, i-1,
`
`i. and i+1
`
`in the IAD_BP. It is noted that the term “IAD_BP”is usedin this disclosure synonymously with
`
`the acronym “IAD_BWP”.
`
`Figure 3B shows another example of a PO with some of the slots including paging CORESETs
`
`(PC). In particular, in paging occasion calculation, the starting point (0) should be determined.
`
`This has to be done taking into accountthe transmission of RMSI and OSI CORESET(as they
`
`are also transmitted within the IAD_BP). The understanding is that the paging CORESET does
`
`not overlap (does not collide in time) with RMSI/OSI CORESET. RMSI CORESET, OSI
`
`CORESET, and paging CORESETareall allocated within the IAD_BP. So, they are located in
`
`the same frequency portion. However, they cannot overlap in time, which is achieved by gNB
`
`10
`
`15
`
`20
`
`25
`
`30
`
`10
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`configuring them. Thus, in case of a “Pattern 1” in which the SSBs and the pagin CORESET
`
`are in the same band IAD_BP, the transmission pattern of the SSBs, is taken into account.
`
`The transmission pattern of SSBstypically takes approximately a half-frame (i.e., 5ms window)
`
`every Tsss.
`
`In particular, Figure 4 shows framing in NR with SSB burst set.
`
`In this exemplary
`
`representation, SSB burst set is in the first half-frame.
`
`In NR, a frame has 10ms and
`
`correspondingly a half-frame has 5ms. Each half-frame has 5 subframes which are further
`
`divided into slots. The numberof slots differs for different frequency bands (i.e., numerologies).
`
`In Figure 4, the slot-level structure includes slots (shown with differentfill-patterns), each slot
`
`10
`
`containing up to two SSBs. L is the maximum number of SS Blocks (SSBs) in bursts.
`
`In
`
`particular, when looking at Figure 4,
`
`in each slot, up to two SSBs may be mapped. For
`
`example, in 15 KHz band, L=4, there is one burst in two neighboring slots ofthe first half-frame
`
`and it is assumed that each of the slots carries the two SSBs. For the same frequency band
`
`and L=8, there is still one burst over 4 slots with up to two(all together 8) SSBs. For 120KHz
`
`15
`
`band with L=64, there are four SSB bursts in a set.
`
`Figure 5 shows the 3 possible multiplexing patterns for SSB burst set 510, CORESET 520,
`
`and PDSCH (data channel) 530.
`
`“Pattern 1” refers to the multiplexing pattern in which the SSBs (SS/PBCH block) and
`
`the RMSI CORESET occur in different
`
`time instances, while the transmission
`
`20
`
`bandwidth for the SS/PBCH block and the initial active DL BP containing RMSI
`
`CORESEToverlap.
`
`—
`
`“Pattern 2” refers to the multiplexing pattern in which SS/PBCH block and RMSI
`
`CORESEToccur in different time instances, while the transmission bandwidth of the
`
`SS/PBCH block does not overlap with the initial active DL BP containing RMS!
`
`25
`
`CORESET.
`
`—
`
`“Pattern 3” refers to the multiplexing pattern in which SS/PBCH block and RMS!
`
`CORESEToccur in the same time instance, and the transmission bandwidth of the
`
`SS/PBCH block and theinitial active DL BP containing RMSI CORESETdo not overlap.
`
`Moreover, Figure 6 showsperiodicity of an SSB burst set. In general, an SSB burst set has a
`
`30
`
`duration smaller than 5ms, i.e., smaller than a half-frame (the half-frame that is used is
`
`indicated by the network, e.g., “O” indicates a first half-frame and “1” a second half-frame). In
`
`Figure 6, the SSB burst periodicity is set to 20 ms (Tsss=20 ms is a default but an operator
`
`may configure a different value). In general, currently, the periodicity may be selected out of
`
`the values {5, 10, 20,
`
`.... 160}. The periodicity configuration is particularly important for
`
`11
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`multiplexing pattern 1 since it has to be ensured that the SSBs and RMSI CORESETsco not
`
`overlap.
`
`Figure 7 shows that SSBs and RMSI CORESETcan havedifferent numerologies and specifies
`
`for different frequency ranges the number of SSBs and numerology (Sub-Carrier-Spacing,
`
`SCS). For example, based on the table in Fig. 7, possible CORESET durations (in symbols)
`are follows:
`
`— Pattern 1: {1,2,3}, pattern 2: {1,2}, and pattern 3: {2}.
`
`— RMSI CORESETconfiguration depends on SSB/RMSI numerology combination as
`
`well as the multiplexing pattern.
`
`— This configuration is re-used by OSI and paging.
`
`Figure 8 showsrelation between frequency bands, SSBs and numerology. In particular, it has
`
`been agreed that the maximum number of SS-blocks within SS burst set, L, for different
`
`frequency rangesare asfollows:
`
`— For frequency range up to 3 GHz, L is 4
`
`— For frequency range from 3 GHz to 6 GHz,L is 8
`
`— For frequency range from 6 GHz to 52.6 GHz, L is 64 Just a clarification. The value ‘L’
`
`is the maxinum number of SSBs that can be transmitted. The operator can decide to
`
`use less beams. How many beams are used, and when, they are transmitted (in a
`
`predefined set of candidate location for the SSBs) is indicated by the network.
`
`In general,
`
`it is desirable to avoid the UE to monitor the whole PO where several paging
`
`CORESETare transmitted using different beams, which can be inefficient (energy costly).
`
`Hence, taking advantage of the QCL is a preferred approach.
`
`Thus, the present disclosure relates to allocation and design of paging occasions.
`
`A user device and a base station corresponding to an exemplary embodiment of the present
`
`disclosure are shownin Fig. 9. The user device 910 (i.e., user equipment (UE) or userterminal)
`
`and the base station 960 (i.e., a gNB of NR) communicate with each other over a wireless
`
`channel 950.
`
`The presentdisclosure relates to transmission and reception of paging signals and in particular
`
`to determination of location and/or length for the paging signals.
`
`In particular,
`
`it relates to
`
`10
`
`15
`
`20
`
`25
`
`12
`
`

`

`WO 2019/192006
`
`PCT/CN2018/082061
`
`determining the location and length of the paging occasions taking into account beam-
`
`sweeping operation such as the one used in NR.
`
`Moreover,
`
`in some embodiments, additional constraints (which may follow from some
`
`desirable design principles discussed in 3GPP)
`
`to take into account
`
`include: pre-
`
`synchronization, avoiding CORESETscollisions, and load-adaptation (i.e., paging capacity
`
`should be at least equal to LTE and adjustable). In general, a unified framework is desirable.
`
`It means that we have a solution that can be applied (perhaps with different configuration)
`
`regardless of the other settings of