WO2019097656A1 - Dispositif utilisateur - Google Patents

Dispositif utilisateur Download PDF

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Publication number
WO2019097656A1
WO2019097656A1 PCT/JP2017/041375 JP2017041375W WO2019097656A1 WO 2019097656 A1 WO2019097656 A1 WO 2019097656A1 JP 2017041375 W JP2017041375 W JP 2017041375W WO 2019097656 A1 WO2019097656 A1 WO 2019097656A1
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Prior art keywords
transmission
carrier
user apparatus
synchronization signal
data
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PCT/JP2017/041375
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English (en)
Japanese (ja)
Inventor
真平 安川
聡 永田
ホワン ワン
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株式会社Ｎｔｔドコモ
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Priority to PCT/JP2017/041375 priority Critical patent/WO2019097656A1/fr
Publication of WO2019097656A1 publication Critical patent/WO2019097656A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a user equipment in a wireless communication system.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution Advanced
  • NR New Radio
  • 5G New Radio
  • D2D reduces traffic between a user apparatus and a base station, and enables communication between user apparatuses even when the base station becomes incapable of communication in a disaster or the like.
  • D2D is D2D discovery (also referred to as D2D discovery, also referred to as D2D discovery) for finding another user apparatus that can communicate, and D2D communication for direct communication between user apparatuses (D2D direct communication, D2D communication, direct communication between terminals) It is divided roughly into () and so on.
  • D2D communication, D2D discovery, and the like are simply referred to as D2D or Sidelink, unless distinction is made in particular.
  • the signal transmitted / received by D2D is called a side link signal or SL (Sidelink) signal.
  • V2X Vehicle to Everything
  • V2XI Vehicle to Infrastructure
  • RSU Road-Side Unit
  • V2N Vehicle to Infrastructure
  • V2P Vehicle to Pedestrian
  • Mode 3 and Mode 4 are defined for resource allocation for V2X communication to the user apparatus.
  • transmission resources are dynamically allocated by DCI (Downlink Control Information) sent from the base station to the user apparatus.
  • DCI Downlink Control Information
  • SPS Semi Persistent Scheduling
  • the user apparatus autonomously selects transmission resources from the resource pool.
  • D2D carrier aggregation is being considered.
  • two D2D signals related to the data are simultaneously transmitted by carrier aggregation of carriers A and B (case 1).
  • transmission may be performed using carrier A and carrier B at different times (different subframes) with respect to two pieces of data that the user apparatus has in the buffer (case 2). Both cases 1 and 2 can be referred to as multicarrier transmission.
  • Non-Patent Document 1 In order for the receiving user apparatus to receive (demodulate) the D2D signal transmitted by the transmitting user apparatus, it is necessary for the receiving user apparatus to be synchronized with the transmitting user apparatus. . In order to realize such synchronization, there is a method in which a user apparatus on the transmitting side transmits a synchronization signal (for example, Non-Patent Document 1).
  • a user equipment supporting multi-carrier transmission selects a carrier for transmission of control information / data in resource selection or resource reselection (denoted as resource (re) selection) for transmission of control information / data or It is conceivable to perform reselection (denoted as (re) selection).
  • the user apparatus selects the same carrier as that used to transmit control information / data as the carrier used to transmit the synchronization signal. In this case, since resource (re) selection for transmission of control information / data is performed at short time intervals, it is necessary to frequently switch carriers used for transmission of synchronization signals.
  • the present invention has been made in view of the above, and provides a technique that enables a user apparatus supporting sidelink multicarrier transmission to appropriately select a carrier to be used for transmission of a synchronization signal.
  • the purpose is
  • a user equipment in a wireless communication system A configuration information management unit that holds information on one or more candidate carriers that can be used for transmitting a sidelink synchronization signal; A carrier selection unit that selects or reselects a transmission carrier to be used for transmission of the synchronization signal from the one or more candidate carriers; And a signal transmitting unit that transmits the synchronization signal using the transmission carrier.
  • a technology that enables a user apparatus supporting sidelink multicarrier transmission to appropriately select a carrier to be used for transmission of a synchronization signal.
  • V2X It is a figure for demonstrating D2D. It is a figure for demonstrating D2D. It is a figure for demonstrating MAC PDU used for D2D communication. It is a figure for demonstrating the format of SL-SCH subheader. It is a figure for demonstrating the example of the channel structure used by D2D. It is a figure which shows the structural example of the radio
  • the wireless communication system according to the present embodiment is assumed to support at least the existing LTE communication scheme. Therefore, when the wireless communication system operates, the existing technology defined by the existing LTE can be used as appropriate.
  • the existing technology is not limited to LTE.
  • “LTE” used in this specification has a broad meaning including LTE-Advanced and LTE-Advanced and later, unless otherwise specified.
  • channel names and signal names used in existing LTE are used, but this is for the convenience of description, and channels, signals and the like similar to these. May be called by other names.
  • the present embodiment assumes that V2X is mainly targeted, the technology according to the present embodiment is not limited to V2X, but D2D in general including “D2D discovery” and “D2D communication”. It is widely applicable to
  • D2D device-to-device communication
  • D2D is broadly divided into “D2D discovery” and “D2D communication”.
  • D2D discovery as shown in FIG. 2A, a resource pool for a Discovery message is secured for each Discovery period, and the user apparatus transmits a Discovery message (discovery signal) in the resource pool.
  • Discovery message discovery signal
  • Type 1 the user apparatus autonomously selects a transmission resource from the resource pool.
  • Type 2b semi-static resources are allocated by higher layer signaling (for example, RRC signaling).
  • “D2D communication” As shown in FIG. 2B, resource pools for SCI (Sidelink Control Information) / data transmission are periodically secured.
  • the user apparatus on the transmission side notifies the reception side of a data transmission resource (PSSCH resource pool) or the like by the SCI using a resource selected from the Control resource pool (PSCCH resource pool), and transmits data using the data transmission resource.
  • PSSCH resource pool a data transmission resource
  • PSCCH resource pool a resource selected from the Control resource pool
  • Mode 1 and Mode 2 in more detail about “D2D communication”.
  • resources are dynamically allocated by (E) PDCCH sent from the base station to the user apparatus.
  • Mode 2 the user apparatus autonomously selects transmission resources from the resource pool. For resource pools, those notified by SIB or those defined in advance are used.
  • Rel-14 has Mode 3 and Mode 4.
  • Rel-14 it is possible to transmit SCI and data simultaneously (in one subframe) in resource blocks adjacent in the frequency direction.
  • the user apparatus simultaneously (in one subframe) transmit SCI (control information) and data in resource blocks adjacent in the frequency direction.
  • SCI control information
  • PSDCH Physical Sidelink Discovery Channel
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • a MAC (Medium Access Control) PDU (Protocol Data Unit) used for D2D includes at least a MAC header, a MAC control element, a MAC SDU (Service Data Unit), and Padding.
  • the MAC PDU may contain other information.
  • the MAC header is configured of one SL-SCH (Sidelink Shared Channel) subheader and one or more MAC PDU subheaders.
  • the SL-SCH subheader is composed of a MAC PDU format version (V), transmission source information (SRC), transmission destination information (DST), reserved bit (R) and the like.
  • V is assigned to the beginning of the SL-SCH subheader and indicates a MAC PDU format version used by the user apparatus.
  • Information on the transmission source is set in the transmission source information.
  • An identifier related to ProSe UE ID may be set in the transmission source information.
  • Information on the transmission destination is set in the transmission destination information. In the destination information, information on the ProSe Layer-2 Group ID of the destination may be set.
  • FIG. 5 An example of a D2D channel structure is shown in FIG. As shown in FIG. 5, PSCCH resource pools and PSSCH resource pools used for “D2D communication” are allocated. In addition, PSDCH resource pools used for "D2D discovery" are allocated in a cycle longer than the channel cycle of "D2D communication".
  • PSSS Primary Sidelink Synchronization signal
  • SSSS Secondary Sidelink Synchronization signal
  • PSBCH Physical Sidelink Broadcast Channel
  • PSSS / SSSS and PSBCH are transmitted in one subframe.
  • PSSS / SSSS is described as SLSS.
  • SLSS which does not include PSBCH may be transmitted in one certain subframe.
  • FIG. 6 is a diagram showing an example of configuration of a wireless communication system according to the present embodiment.
  • the radio communication system according to the present embodiment includes a base station 10, a user apparatus UE1, and a user apparatus UE2.
  • the user apparatus UE1 intends to be a transmitting side and the user apparatus UE2 is intended to be a receiving side, but both the user apparatus UE1 and the user apparatus UE2 have both a transmitting function and a receiving function.
  • the user apparatus UE1 and the user apparatus UE2 and the like will be simply described as "user apparatus UE" when not particularly distinguished.
  • FIG. 6 shows the case where both the user apparatus UE1 and the user apparatus UE2 are within the coverage as an example, the operation in the present embodiment is the case where both user apparatuses UE are within the coverage and both user's
  • the present invention is applicable to either the case where the device UE is out of coverage or the case where one user device UE is in coverage and the other user device UE is out of coverage.
  • Each of the user apparatuses UE has a function of cellular communication as the user apparatus UE in LTE or NR, and a D2D function (function of performing apparatus-to-device communication by radio) including signal transmission / reception in the above-mentioned channel .
  • the user apparatus UE has a transmitting side function and a receiving side function that perform the operation described in the present embodiment.
  • the user apparatus UE may be any apparatus having the D2D function, but for example, the user apparatus UE may be a vehicle, a terminal held by a pedestrian, an RSU (UE type RSU having the UE function, etc.), etc. is there.
  • the user apparatus UE may be a vehicle, a terminal held by a pedestrian, an RSU (UE type RSU having the UE function, etc.), etc. is there.
  • the processing content of D2D transmission of the user apparatus UE is basically the same as the processing content of uplink transmission in LTE.
  • the user apparatus UE scrambles and modulates a codeword of transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, precoded complex-valued symbols are mapped to resource elements, a transmission signal (eg, complex-valued time-domain SC-FDMA signal) is generated, and transmitted from each antenna port.
  • a transmission signal eg, complex-valued time-domain SC-FDMA signal
  • base station 10 a function of cellular communication as base station 10 in LTE or NR, and a function for enabling communication of user apparatus UE in the present embodiment (resource pool setting for user apparatus UE) , Candidate carrier setting etc.). Further, the base station 10 may be an RSU (eNB type RSUs having an eNB function).
  • RSU eNB type RSUs having an eNB function
  • the signal waveform used by the user apparatus UE for the side link may be OFDMA, SC-FDMA, or any other signal waveform. May be Further, in the radio communication system according to the present embodiment, as in the existing LTE, a frame consisting of a plurality of subframes (eg, 10 subframes) is formed in the time direction, and a plurality of frequency directions are provided. Consists of sub-carriers of One subframe is an example of one transmission time interval (TTI). Time lengths other than subframes (eg, slots) may be used as transmission time intervals.
  • TTI transmission time interval
  • each user apparatus UE selects radio resources from a synchronized common time-frequency grid.
  • FIG. 7 shows an example in which one subframe is 1 ms, but this is merely an example.
  • one resource has a bandwidth of one subchannel in the frequency direction and one subframe in the time direction.
  • One subchannel has the bandwidth of one or more resource blocks.
  • a certain resource can be identified by, for example, a subframe number and a subchannel number (or resource block number).
  • a certain resource can be identified by the number.
  • the “information on reserved resource” described in the present embodiment is, for example, any one or more of the above-mentioned subframe number, subchannel number (or resource block number), and resource number.
  • resource (re-) selection referring to FIGS. 8 to 10, the resource used by the user apparatus UE to transmit an SL signal (data or control information or data and control information) is autonomously The operation to be selected will be described.
  • the user apparatus UE performs sensing in the background.
  • the user apparatus UE measures interference patterns by reading control information (including resource reservation information, priority, etc.) and power detection. Then, at the time of transmission packet generation, the user apparatus UE selects up to two resources from among a plurality of resources (candidate resources) with low interference in the resource selection window, based on the result of sensing for the past 1000 ms, for example
  • the SL signal is transmitted using the resource.
  • the two resources correspond to the initial transmission resource and the retransmission resource. Further, in the present embodiment, the transmission is not limited to the maximum of two transmissions as described above, and three or more transmissions may be performed.
  • Transmission of the SL signal is performed periodically. Also, resource reservation is performed. Specifically, the SL signal in a certain transmission cycle includes information on reserved resources used for transmission in the next transmission cycle together with data schedule information. In addition, in the two-time transmission as shown in FIG. 8, the SL signal (specifically, control information) in each transmission includes the information of the other transmission reservation resource as well as the information of its own reservation resource. .
  • the packet to be transmitted may continue to collide with packets transmitted from other user apparatuses UE.
  • the user apparatus UE can not detect whether or not its transmission packet and the transmission packet of another user apparatus UE collide. Therefore, a reselection counter for reselecting resources is defined. As shown in FIG. 9, the reselection counter is decremented each time transmission is performed from the transmission of the first cycle, and the user apparatus UE reselects resources when the reselection counter becomes zero.
  • resource selection is to select a resource first when a transmission packet is newly generated
  • resource reselection means to select a resource again after “resource selection”. To choose.
  • resource selection may be used in a meaning including “resource reselection”.
  • resource reselection may be reselection other than reselection of resources based on a reselection counter as shown in FIG. Note that “resource (re) selection” means “resource selection or resource reselection”.
  • step S1 the user apparatus UE excludes the resource not monitored from the candidate resources.
  • the user apparatus UE can not monitor the subframe of the resource used for transmission due to the limitation of the Half duplex, the resource of the entire subframe is excluded from the candidate resources.
  • the user apparatus UE grasps the reserved resource (transmission resource of the other user apparatus) by decoding the control information of the other user apparatus UE received in the sensing, and uses the resources from the candidate resources. exclude. More specifically, the user apparatus UE receives the reference signal reception power (S-RSRP, hereinafter referred to as RSRP) in the resource (specifically, PSSCH) among the reserved resources in the sensing section of 1000 ms. Excludes resources above the threshold. Here, when the remaining candidate resources are 20% or less of the whole, adjustment is performed such that 20% or more candidate resources remain by increasing the threshold by 3 dB.
  • S-RSRP reference signal reception power
  • step S3 the user apparatus UE selects, from among the remaining candidate resources, two resources having a small amount of interference based on the S-RSSI. More specifically, from the result of evaluating the received power (S-RSSI) of each subchannel in a cycle of 100 ms, 20% of resources with low levels are left as candidates.
  • S-RSSI received power
  • step S4 the user apparatus UE (re) selects transmission resources at random among the candidate resources remaining at the time of step S3.
  • the reason for selecting transmission resources at random is that there is a high possibility that the interference states of the neighboring UEs are similar, and if the resource with the least interference is selected, the probability of occurrence of packet collision between neighboring UEs is high. It is.
  • a plurality of carriers are defined in the side link, and the user apparatus UE uses PSCCH // with one or more carriers of the plurality of defined carriers. It is possible to transmit control information / data (meaning “control information, data or control information and data”) by PSSCH. Transmitting control information / data using PSCCH / PSSCH may be expressed as transmitting PSCCH / PSSCH.
  • control information / data candidate carrier For example, one or more carriers (referred to as “control information / data candidate carrier”) that can be used for transmission of control information / data are set in the user apparatus UE semi-statically, for example.
  • One or more carriers actually used from among one or more candidate carriers for each transmission opportunity of control information / data or resource (re) selection this is referred to as “control information / data transmission carrier Select and use it to transmit control information / data.
  • the carrier that can be used to transmit the synchronization signal is called “synchronization signal candidate carrier” and the carrier used to transmit the actual synchronization signal is “synchronization signal transmission carrier”, as in the control information / data method. Call it
  • resource (re) selection in multi-carrier transmission the above-mentioned resource (re) selection operation is performed for each carrier.
  • the resources (re) selection operation described above may be performed by regarding resources of a plurality of carriers as one resource of one carrier.
  • selection or reselection of control information / data transmission carrier (denoted as "(re) selection") may be performed.
  • selection of a carrier is to select a carrier first (eg, at the start of a communication session), and Reselection is to select the carrier again after the first selection (eg, switch carriers).
  • selection of carrier may be used in a meaning including “reselection of carrier”.
  • the (re) selection of control information / data transmission carriers is performed, for example, in terms of selecting carriers with low traffic, avoiding carriers with high traffic.
  • the carrier which can be used about data of a specific type is limited, and when transmitting the data of the said specific type, switching to a specific carrier may arise.
  • FIG. 11 shows synchronization signals and control information / data (PSCCH when user apparatus UE selects a plurality of carriers as candidate carriers (control information / data candidate carriers) that can be used for transmission of control information / data.
  • 3 illustrates an example of transmission of / PSSCH).
  • the information on the control information / data candidate carrier is stored, for example, as setting information in the user apparatus UE.
  • FIG. 11 is a diagram illustrating an example of a case where the user apparatus UE performs carrier aggregation (multicarrier transmission) using three carriers: anchor carrier, carrier B, and carrier C.
  • the user apparatus UE transmits SLSS / PSBCH (a signal including SLSS and PSBCH (MIB-SL) in one subframe) using an anchor carrier.
  • the SLSS / PSBCH is periodically transmitted in predetermined subframes in the frame based on settings from the base station 10 and the like.
  • SLSS / PSBCH will be described as "synchronization signal".
  • the synchronization signal described below may be a signal including both SLSS and PSBCH, may be a signal of only SLSS, or may be a signal of only PSBCH.
  • the user apparatus UE uses a specific synchronization reference as a synchronization reference to generate and transmit a synchronization signal.
  • the user apparatus UE does not transmit synchronization signals on carrier B and carrier C, but transmits data signals (PSCCH / PSSCH) on carrier B.
  • the synchronization reference is a reference of synchronization of the user apparatus, and includes, for example, “GNSS”, “eNB”, and “UE”.
  • GNSS GNSS
  • eNB eNB Synchronization with the user apparatus based on the synchronization signal transmitted from the terminal.
  • UE synchronization reference corresponds to the case where none of these apply.
  • GNSS GNSS
  • eNB eNode B
  • UE UE
  • the specific synchronization reference mentioned above is, for example, GNSS. That is, the user apparatus UE uses the GNSS as a synchronization reference, and transmits a synchronization signal synchronized with the GNSS on the anchor carrier. Here, the user apparatus UE does not transmit the synchronization signal in any of the carrier B and the carrier C. On the other hand, the user apparatus UE transmits the data signal on the carrier B which has not transmitted the synchronization signal.
  • the transmitting user apparatus UE starts with the carrier B.
  • the transmitted data signal can be received.
  • the user apparatus UE may transmit no data signal on a carrier other than the anchor carrier that transmits the synchronization signal.
  • the data signal is transmitted by a carrier other than the anchor carrier that transmits the synchronization signal, the data signal can not be received by the user apparatus UE on the receiving side that receives the carrier.
  • anchor carrier As an example, and the concept of “anchor carrier” may not be used in the present embodiment.
  • a user apparatus UE synchronized with a specific synchronization reference such as GNSS and a user apparatus UE operating at its own timing without being synchronized with GNSS etc. coexist. Since it is assumed, it is desirable that the user apparatus UE on the transmission side of control information / data transmit synchronization signals on each carrier when transmitting control information / data using a plurality of carriers. That is, in this case, the user apparatus UE selects a carrier used for actual transmission of control information / data as a carrier for synchronization signal transmission.
  • the user apparatus UE can use carrier A, a carrier A as a candidate for control information / data, which can be used for transmission of control information / data at a time before selection of resources (re) for transmission of control information / data.
  • B and carrier C are selected, and control information / data and synchronization signal are transmitted on each of the carrier A and the carrier B.
  • FIG. 12 when the upper arrow filled in with a thick frame is attached, it indicates that both the synchronization signal and control information / data are transmitted, and the bold frame If only (the content is the same as the background), it indicates that only the synchronization signal is transmitted.
  • the user apparatus UE selects carrier A and carrier C as control information / data and transmission carriers of synchronization signal by resource (re) selection, selects these carriers, and selects control information / data and synchronization signal.
  • switching of carriers for transmitting a synchronization signal may occur at each resource (re) selection.
  • Resource (re) selection may occur, for example, every second. However, it takes more than one second to newly detect the synchronization reference (eg, synchronization signal from other UEs) and to start transmission of the synchronization signal on the switched carrier synchronously with it. Therefore, if the frequency of carrier switching for transmitting a synchronization signal is high, synchronization may become unstable.
  • Example 1 In the first embodiment, one or more carriers (synchronization signal candidate carriers) that can be used for transmission of synchronization signals are configured or pre-configured in the user apparatus UE. Alternatively, the one or more synchronization signal candidate carriers may be predefined.
  • setting is, for example, setting of one or more carriers that can be used for transmission of a synchronization signal by RRC signaling or the like from the base station 10 of the cell in which the user apparatus UE is located.
  • pre-setting is, for example, that one or more carriers are set from a predetermined server at the time of shipment, purchase, etc. of the user apparatus UE.
  • configuration or “preconfiguration” may be described as "(pre) configuration” ((pre) configure).
  • Predefined means that, for example, the synchronization signal candidate carrier is described in a specification of a standard, and information on the synchronization signal candidate carrier is stored in advance in the user apparatus UE.
  • the user apparatus UE when carrier A, carrier B, and carrier C are set (in advance) as control information / data candidate carriers, the user apparatus UE has carriers A and B as synchronization signal candidate carriers. (Pre-set) is set.
  • the user apparatus UE selects one or more carriers of carrier A, carrier B and carrier C for actual transmission of control information / data. Meanwhile, the user apparatus UE selects one or both of the carrier A and the carrier B for actual transmission of the synchronization signal. Therefore, by setting (in advance) candidate carriers for transmission of synchronization signals, the carrier switching frequency for transmitting synchronization signals is synchronized using carriers used for transmission of control information / data. It can be lower than when sending a signal.
  • Example 2 Example 2 will be described below.
  • the second embodiment can be applied in combination with the first embodiment.
  • the user apparatus UE arbitrarily selects one or more synchronization signal transmission carriers to be used for transmission of a synchronization signal from one or more candidate carriers.
  • the timing at which this selection occurs may be arbitrary, or may be a specific opportunity (eg, resource (re) selection, timer expiration, etc.).
  • An operation example of selecting a synchronization signal transmission carrier at the time of resource (re) selection or the like will be described in detail in a third embodiment.
  • the user apparatus UE arbitrarily selects one or more synchronization signal transmission carriers from one or more control information / data candidate carriers.
  • “arbitrarily” means that carriers can be selected without being limited to a specific carrier.
  • Arbitrarily selecting one or more synchronization signal transmission carriers may, for example, randomly select one or more synchronization signal transmission carriers from a plurality of candidate carriers, from a plurality of candidate carriers, according to a rule, Selecting one or more synchronization signal transmission carriers.
  • control information / data candidate carrier is carrier A
  • carrier B, carrier C for example, the user apparatus UE selects carrier A for synchronization signal transmission at the first selection opportunity, and selects the next.
  • Carrier B is selected for synchronization signal transmission on the occasion
  • carrier C is selected for synchronization signal transmission on the next selection opportunity.
  • option 2-2 the user apparatus UE actually uses one or more synchronization signal transmissions from among one or more synchronization signal candidate carriers (pre-configured) set in the operation of the first embodiment.
  • the synchronization signal transmission carrier is arbitrarily selected. Arbitrarily selecting is similar to option 1.
  • the user apparatus UE uses one or more synchronization signal transmission carriers to actually use for synchronization signal transmission from one or more candidate carriers (eg, candidate carriers in option 1 or option 2).
  • the carrier that actually transmits the control signal / data is preferentially selected.
  • the user apparatus UE selects the carrier A from the candidate carriers A, B, and C as the carrier for actually transmitting the control signal / data
  • the user apparatus UE selects the carrier A (or the carrier A). And other carriers) are selected as synchronization signal transmission carriers.
  • an opportunity to select one or more synchronization signal transmission carriers is, for example, a resource (re) selection for control signal / data transmission when a certain condition (eg, counter expiration) is satisfied. It is assumed that it is an opportunity (the details of the selection operation in this example will be described in Example 3).
  • the target user apparatus UE preferentially selects, from among candidate carriers, the same carrier as the carrier of the user apparatus UE serving as a synchronization source as a synchronization signal transmission carrier.
  • the user apparatus UE-A receives a synchronization signal on the carrier A from the user apparatus UE-B and uses it as a synchronization reference.
  • the user apparatus UE-A selects a synchronization signal transmission carrier for actually transmitting a synchronization signal from candidate carriers (carriers A, B, C), the carrier A (or the carrier A and the other) choose a carrier).
  • the carrier A or the carrier A and the other choose a carrier.
  • the user apparatus UE can be implemented by combining any one or more of the options 1 to 4 described above.
  • the synchronization signal transmission carrier is not limited to a part of carriers, and is randomized among a plurality of user apparatuses UE. Therefore, for example, a user apparatus UE supporting only reception of a specific carrier (eg, UE of Rel-14) can synchronize with a user apparatus UE having functions of the present embodiment (eg, UE of Rel-15). The possibilities can be increased.
  • Example 3 Next, Example 3 will be described.
  • the third embodiment can be implemented in combination with the first and second embodiments.
  • the third embodiment relates to, for example, an operation (that is, reselection) in which the synchronization signal transmission carrier initially selected by the method of the first and second embodiments is switched over time.
  • the operation of the third embodiment can be applied not only to carrier reselection but also to carrier selection.
  • the user apparatus UE reselects a synchronization signal transmission carrier, for example, periodically.
  • a minimum period time length for not performing reselection
  • reselection of the synchronization signal transmission carrier or synchronization reference source
  • the synchronization signal transmission carrier is not limited to a part of carriers in reselection, and is randomized among a plurality of user apparatuses UE. Therefore, for example, a user apparatus UE supporting only reception of a specific carrier (eg, UE of Rel-14) can synchronize with a user apparatus UE having functions of the present embodiment (eg, UE of Rel-15). The possibilities can be increased.
  • Specific operation options include the following options 3-1 to 3-4.
  • a synchronization signal transmission carrier reselection period is pre-defined.
  • Predefined means that, for example, the cycle is described in the specification of the standard, and the operation of the cycle is incorporated into the user apparatus UE as a function of the user apparatus UE.
  • the synchronization signal transmission carrier reselection period is preconfigured in the user apparatus UE.
  • the cycle of reselection of the synchronization signal transmission carrier may be configured in the user apparatus UE.
  • the user apparatus UE for which the period (T) in options 3-1 and 3-2 is set is, for example, as a synchronization signal transmission carrier from among carriers A to C which are synchronization signal candidate carriers at a certain time t. Select carriers A and B. Then, at time t + T, the user apparatus UE reselects carriers A and C as synchronization signal transmission carriers. Such an operation is repeated at T intervals.
  • the selection method of the second embodiment can be applied to the selection method of the synchronization signal transmission carrier at the time of the above reselection. For example, in the case of applying option 2-3, if carrier A is used for transmission of control information / data at the reselection timing, the user apparatus UE gives priority to carrier A as a synchronization signal transmission carrier. select.
  • the user apparatus UE determines the reselection timing of the synchronization signal transmission carrier based on the transmission opportunity of control information / data.
  • the transmission opportunity is, for example, a periodic arrival opportunity when transmitting control information / data periodically. Also, at this transmission opportunity, switching of control information / data transmission carrier may occur.
  • the user apparatus UE selects the first synchronization signal transmission carrier.
  • the user apparatus UE sets a counter (which may be referred to as a timer) to a predetermined value.
  • the predetermined value is, for example, (pre-set) set in the user apparatus UE.
  • the counter is decremented in this example, this is an example, and the counter may be added.
  • the counter is updated (e.g., decremented by a certain value) at every transmission opportunity of control information / data at the user apparatus UE, and at time B, the counter expires.
  • expiration may be 0 or less, may be a predetermined value, or may be less than a predetermined value.
  • “expiring” may mean that the counter becomes a predetermined value or may become larger than the predetermined value.
  • the user apparatus UE When the user apparatus UE detects that the counter has expired, it triggers reselection of the synchronization signal transmission carrier and performs reselection of the synchronization signal transmission carrier.
  • the reselection method for example, option 2 can be applied.
  • the user apparatus UE determines the reselection timing of the synchronization signal transmission carrier based on the resource (re) selection of control information / data. Also, at this resource (re) selection timing, switching of control information / data transmission carrier may occur.
  • the user apparatus UE selects the first synchronization signal transmission carrier.
  • the user apparatus UE sets a counter (which may be referred to as a timer) to a predetermined value.
  • the predetermined value is, for example, (pre-set) set in the user apparatus UE. Also in this example, it is assumed that the counter is decremented, but this is an example, and the counter may be added.
  • the counter is updated (for example, decremented by a certain value) at each resource (re) selection in the user apparatus UE, and at time B, the counter expires.
  • expiration may be 0 or less, may be a predetermined value, or may be less than a predetermined value.
  • expiration may be that the counter becomes a predetermined value or may be larger than the predetermined value.
  • the user apparatus UE When the user apparatus UE detects that the counter has expired, it triggers reselection of the synchronization signal transmission carrier and performs reselection of the synchronization signal transmission carrier.
  • the reselection method for example, option 2 can be applied.
  • a predetermined time interval is predefined or set (pre-set) in the user apparatus UE as the minimum time interval for performing reselection of a synchronization signal transmission carrier.
  • the user apparatus UE performs selection (or reselection) of the synchronization signal transmission carrier at a certain timing, (re) selection of the control information / data transmission carrier is performed during the above-mentioned minimum time interval. Even if it is performed, reselection of the synchronization signal transmission carrier is not performed, and synchronization signal transmission carrier reselection is performed after the period of the above-mentioned minimum time interval has elapsed.
  • Embodiments 1 to 3 A transmission operation example of the user apparatus UE according to the first to third embodiments will be described with reference to FIG.
  • carriers A, B, and C are set in the user apparatus UE as control information / data transmission candidate carriers.
  • carriers A and B are set in the user apparatus UE as synchronization signal candidate carriers.
  • the user apparatus UE selects carriers A and B as control information / data transmission carriers, and selects carriers A and B as synchronization signal transmission carriers to perform transmission.
  • the user apparatus UE selects carriers A and C as control information / data transmission carriers.
  • the user apparatus UE does not switch the synchronization signal transmission carrier, for example, because the counter described in the third embodiment has not expired. Thus, frequent switching of the synchronization signal transmission carrier can be suppressed.
  • FIG. 16 is a diagram illustrating an example of the setting operation for the user apparatus UE.
  • configuration information is transmitted from the base station 10 to the user apparatus UE.
  • the setting information includes, for example, information of the synchronization signal candidate carrier and the value of the counter.
  • the user apparatus UE selects a synchronization signal transmission carrier based on the setting information, and transmits a synchronization signal (S102).
  • ⁇ Others> basically, switching of control information / data transmission carrier is performed if predetermined conditions (arrival of period, counter expiration) are not satisfied even at timing when switching of control information / data transmission carrier is performed. At timing, switching of the synchronization signal transmission carrier is not performed.
  • the user apparatus UE when the user apparatus UE switches the control information / data transmission carrier to the specific carrier in order to transmit data that can only be transmitted on the specific carrier, the user apparatus UE synchronizes at the switching timing.
  • the signal transmission carrier may also be switched to the specific carrier.
  • Example 4 A fourth embodiment will now be described.
  • the fourth embodiment can be implemented in combination with any one or more of the first to third embodiments.
  • the user apparatus UE preferentially selects control information / data transmission carrier as the synchronization signal transmission carrier.
  • the user apparatus UE performs (re) selection of control information / data transmission carrier not when it performs resource (re) selection of control information / data each time but when a certain condition is satisfied.
  • Option 4-1 the user apparatus UE is triggered (when instructed) by the upper layer to perform (re) selection of control information / data transmission carrier along with resource (re) selection. / Carry out (re) selection of data transmission carrier together with resource (re) selection. That is, if there is no trigger from the upper layer, (re) selection of control information / data transmission carrier is not performed when making resource (re) selection.
  • (re) selection of control information / data transmission carrier and resource (re) selection are performed in the lower layer of the user apparatus UE (eg, when the upper layer is MAC, the physical layer, and the upper layer is RRC)
  • the entity of MAC implements and controls the selection method by the entity of upper layer (eg MAC or RRC when lower layer is physical layer, RRC when lower layer is MAC)
  • the above operation may be performed regardless of such lower layer / upper layer distinction.
  • control information / data candidate carriers are set (in advance) in the user apparatus UE, and information of the control information / data candidate carriers is notified from the upper layer to the lower layer, and the lower layer , One or more control information / data transmission carriers are selected from the control information / data candidate carriers.
  • the trigger may be issued by an instruction from the base station 10, or may be issued at the determination of the user apparatus UE.
  • the user apparatus UE determines (re) selection timing of the control information / data transmission carrier based on the transmission opportunity of the control information / data.
  • the transmission opportunity is, for example, a periodic arrival opportunity when transmitting control information / data periodically.
  • the user apparatus UE selects the first control information / data transmission carrier at the timing indicated by A.
  • the user apparatus UE sets a counter (which may be referred to as a timer) to a predetermined value.
  • the predetermined value is, for example, (pre-set) set in the user apparatus UE.
  • the counter is decremented in this example, this is an example, and the counter may be added.
  • the counter is updated (e.g., decremented by a certain value) at every transmission opportunity of control information / data at the user apparatus UE, and at time B, the counter expires.
  • expiration may be 0 or less, may be a predetermined value, or may be less than a predetermined value.
  • expiration may be that the counter becomes a predetermined value or may be larger than the predetermined value.
  • the user apparatus UE When the user apparatus UE detects that the counter has expired, it triggers reselection of the control information / data transmission carrier and performs reselection of the control information / data transmission carrier.
  • the user apparatus UE determines (re) selection timing of control information / data transmission carrier based on resource (re) selection of control information / data.
  • the user apparatus UE selects the first control information / data transmission carrier at the timing indicated by A.
  • the user apparatus UE sets a counter (which may be referred to as a timer) to a predetermined value.
  • the predetermined value is, for example, (pre-set) set in the user apparatus UE. Also in this example, it is assumed that the counter is decremented, but this is an example, and the counter may be added.
  • the counter is updated (for example, decremented by a certain value) at each resource (re) selection in the user apparatus UE, and at time B, the counter expires.
  • expiration may be 0 or less, may be a predetermined value, or may be less than a predetermined value.
  • expiration may be that the counter becomes a predetermined value or may be larger than the predetermined value.
  • the user apparatus UE When the user apparatus UE detects that the counter has expired, it triggers reselection of the control information / data transmission carrier and performs reselection of the control information / data transmission carrier.
  • carriers A, B, and C are set in the user apparatus UE as control information / data candidate carriers. Also, for example, carriers A, B, and C (in advance) are set as synchronization signal candidate carriers in the user apparatus UE.
  • the user apparatus UE selects carriers A and B as control information / data transmission carriers, and selects carriers A and B as synchronization signal transmission carriers to perform transmission.
  • control information / data transmission carrier and synchronization signal transmission carrier
  • switching (re-selection) of control information / data transmission carrier (and synchronization signal transmission carrier) is not performed, for example, because the counter in option 4-3 has not expired.
  • the first control information / data transmission carrier (and synchronization signal transmission carrier) is continuously used.
  • next resource (re) selection for example, since the counter in option 4-3 has expired, a switch of control information / data transmission carrier (and synchronization signal transmission carrier) is performed.
  • carriers A and C are selected as control information / data transmission carriers (and synchronization signal transmission carriers) from candidate carriers A to C, and transmission of control information / data and synchronization signals on these carriers Is done.
  • FIG. 20 is an example in the case where a part of carriers among the plurality of control information / data transmission carriers is not selected as a synchronization signal transmission carrier, in the user apparatus UE.
  • the control information / data transmission carrier here, carrier A
  • carrier A is preferentially selected as the synchronization signal transmission carrier.
  • carriers A, B, and C are set in the user apparatus UE as control information / data candidate carriers. Also, for example, carriers A, B, and C (in advance) are set as synchronization signal candidate carriers in the user apparatus UE.
  • the user apparatus UE selects carriers A and B as control information / data transmission carriers, and selects carriers A and B as synchronization signal transmission carriers to perform transmission.
  • the switch of the control information / data transmission carrier (and the synchronization signal transmission carrier) is not performed because the counter in option 4-3 has not expired, and the first control Information / data transmission carriers (and synchronization signal transmission carriers) are continuously used.
  • next resource (re) selection for example, since the counter in option 4-3 has expired, a switch of control information / data transmission carrier is performed.
  • carriers A and C are selected as control information / data transmission carriers from the candidate carriers A to C.
  • switching (reselection) of synchronization signal transmission carriers is not performed, and carriers A and B continue as synchronization signal transmission carriers. used.
  • the user apparatus UE has, for example, a MAC entity including the functions described in Non-Patent Document 2.
  • the MAC entity comprises a sidelink HARQ entity, which holds a plurality of sidelink processes operating in parallel.
  • the maximum number of sidelink processes is, for example, two.
  • Each sidelink process is configured to send multiple MAC PDUs based on sensing.
  • the operations of the first to fourth embodiments described above in the present embodiment are executed for each side link process.
  • selection of control information / data transmission carrier and selection of synchronization signal transmission carrier are implemented independently for each side link process.
  • This enables independent control for each side link process.
  • the following fifth embodiment may be performed for each side link process.
  • Example 5 Example 5 will now be described.
  • the fifth embodiment can be implemented in combination with the first to fourth embodiments.
  • the fifth embodiment may be implemented separately from the first to fourth embodiments.
  • transmission of control information / data may occur simultaneously on a plurality of carriers by sidelink carrier aggregation (sidelink CA).
  • the user apparatus UE transmits data simultaneously on multiple carriers, it is possible to exceed the maximum transmission power allowed in the user apparatus UE.
  • power scaling, packet drop, or the like is performed to make the transmission power thereof equal to or less than the maximum transmission power allowed in the user apparatus UE.
  • simultaneous transmission of data on multiple carriers may continue from (re) selection of resources to (re) selection of the next resource, but power scaling or packet drop in such continuous transmission is semi It is not preferable because it may cause persistent performance deterioration.
  • reselection based on continuous non-transmission for allocated resources is specified, for example, in Non-Patent Document 2 (operation based on sl-ReselectAfter).
  • Example 4 in order not to cause the semi-persistent performance degradation, control is performed as follows.
  • options 1 to 4 will be described as options of the fifth embodiment.
  • Options 1-4 can be implemented in combination.
  • Option 1 when the user apparatus UE detects that data transmission with a transmission power (or transmission power density) smaller than a predetermined threshold has continued a predetermined number of times in a side link process, the user apparatus UE performs the process in the side link process. Trigger resource reselection and implement resource reselection.
  • This continuous data transmission is, for example, simultaneous data transmission on multiple carriers, but is not limited thereto.
  • the transmission power and the transmission power density may be collectively referred to as “transmission power”.
  • power scaling is applied according to the conditions of resources selected in simultaneous data transmission on a plurality of carriers, and as a result, data transmission with a transmission power (or transmission power density) smaller than a predetermined threshold is predetermined.
  • the above control stops transmission at this small transmission power (or transmission power density) and reselects another resource. For reselected resources, for example, transmission is performed without power scaling applied.
  • the operation of the fifth embodiment is applicable not limited to simultaneous data transmission on a plurality of carriers.
  • a predetermined threshold for example, transmission power calculated for the data transmission (or transmission power density)
  • the transmission may be skipped when it is detected that) is lower than a predetermined threshold). That is, the resources in this transmission opportunity are not used. Also, resource reselection may be performed after skipping.
  • the above-mentioned predetermined number of times is, for example, (pre-set) set in the user apparatus UE. Further, sl-ReselectAfter in Rel-14 set from the base station 10 may be used as the parameter of the predetermined number of times.
  • the threshold of the transmission power may be calculated by the user apparatus UE using the following values (Option 1-1 to Option 1-3).
  • Option 1-1 (pre-configured) or pre-defined power reduction from configured transmission power.
  • Option 1-2 (Pre-set) minimum transmit power or minimum transmit power density.
  • Option 1-3 (Pre) set scaling factor w for transmit power calculated based on (pre) set parameters for power control.
  • the user apparatus UE applies power scaling to transmission on a certain sidelink process so that the maximum transmission power limit is satisfied.
  • the user apparatus UE may consider that transmission is skipped for data transmission with scaled (reduced) power. That is, the resources in this transmission opportunity are not used. Note that the conventional procedure using sl-ReselectAfter may be reused.
  • the user apparatus UE scales (reduces) the sum of transmission powers associated with transmissions of the same priority so that the maximum transmission power limit is satisfied. Any power reduction scheme may be employed for each transmission of the same priority scaled as a result. For example, equal splitting may be employed.
  • the scaled transmit power may be different for each transmission opportunity, avoiding continuous transmission with large scaling.
  • the minimum transmission power or the minimum transmission power density is (pre-set). If the actual transmission power (or transmission power density) is smaller than the minimum transmission power (or minimum transmission power density), the transmission is dropped (skipped). Note that the conventional procedure using sl-ReselectAfter may be reused.
  • the resource is selected such that the transmission power satisfies the (pre) preset minimum transmission power (or minimum transmission power density).
  • Power sharing and packet dropping In this case, power scaling or packet dropping needs to be performed to fulfil the limitation on transmission power.
  • uplink several priciitative forces
  • simultaneous transmission may last last resource reselection.
  • Power scaling or packet drop for consecutive transmission may cause semi-persistent performance degradation.
  • semi-persistent power scaling or packet drop. Following enhancement can be considered for the issue of semi-persistent performance degradation due to simultaneous transmission.
  • Option 1 After certain number of consecutive transmission with transmission power (density) below a threshold, resource reselection is triggered for the sidelink process; or for transmission with transmission power (density) below a threshold, UE considers that transmission is signal transmission on the resource is unused) This configuration can be reuse of sl-ReselectAfter in Rel-14 The number of consecutive transmission is (pre-) configured.
  • the threshold for transmission power is calculated by Option 1-1: (pre-) configured or pre-defined power reduction from configured transmission power Option 1-2: (pre-) configured minimum transmission power or transmission power density Option 1-3: (pre-) configured scaling factor w for the transmission power calculated based on (pre-) configured parameters for power control Option 2: If power scaling is applied to a transmission for a sidelink process that to fillful limitation on maximum transmission power, UE considers that transmission is skipped (transmission opportunity on the resource is unused) while transmitting with scaled power Legacy procedure based on sl-ReselectAfter is reused as much as possible Option 3: For the transmission with the same priority, total transmission power of the transmission with the same priority can be scaled to fulfillment limitation on the maximum transmission power.
  • Minimum transmission power or transmission power density can be (pre) configured. If actual transmission power is below the minimum transmission power, that transmission shall be dropped (skipped).
  • the user apparatus UE and the base station 10 may have all the functions of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, or any one of the five embodiments. May have the function of only one, may have the function of only two of the five embodiments, or may have the function of only three of the five embodiments. And may have the functionality of only four of any of the five.
  • FIG. 21 is a diagram illustrating an example of a functional configuration of the user apparatus UE.
  • the user apparatus UE includes a signal transmission unit 101, a signal reception unit 102, a setting information management unit 103, a resource selection unit, a carrier selection unit 105, and a transmission power control unit 106.
  • the functional configuration shown in FIG. 21 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the functional unit may be arbitrary.
  • the signal transmission unit 101 creates a transmission from transmission data, and wirelessly transmits the transmission signal.
  • the signal reception unit 102 wirelessly receives various signals, and acquires higher layer signals from the received physical layer signals.
  • the signal reception unit 102 includes a function of synchronizing the user apparatus UE with the synchronization reference by receiving a signal of the synchronization reference (eg, GNSS / eNB, synchronization signal from UE synchronized with GNSS / eNB).
  • the signal transmission part 101 contains the function to transmit a signal at the timing of user apparatus UE self.
  • the setting information management unit 103 stores various setting information received from the base station 10 by the signal receiving unit 102 and setting information set in advance.
  • the resource selection unit 104 performs side link resource (re) selection.
  • the carrier selection unit 105 carries out the carrier selection operation described in the first to fourth embodiments.
  • the transmission power control unit 106 executes the transmission power control described in the fifth embodiment. However, the transmission power control described in the fifth embodiment may be performed by the resource selection unit 104 or the carrier selection unit 105.
  • the setting information management unit 103 is configured to hold information on one or more candidate carriers that may be used for transmission of the synchronization signal of the side link, and the carrier selection unit 105 is configured to use the one or more candidate carriers. Among them, a transmission carrier to be used for transmission of the synchronization signal is selected or re-selected, and the signal transmission unit 101 is configured to transmit the synchronization signal using the transmission carrier.
  • the carrier selection unit 105 preferentially selects or reselects a carrier used for transmission of control information or data as a transmission carrier of the synchronization signal. Also, for example, the carrier selection unit 105 performs selection or reselection of a transmission carrier of the synchronization signal at a predetermined cycle. Also, for example, when the predetermined condition is satisfied, the carrier selection unit 105 performs selection or reselection of a transmission carrier of the synchronization signal, as well as selection or reselection of resources of control information or data.
  • the carrier selection unit 105 is configured to select or reselect a transmission carrier to be used for transmission of side link control information or data from one or a plurality of candidate carriers, and the signal transmission unit 101 is And transmitting the control information or the data using the transmission carrier, and the carrier selection unit 105 is used to transmit the control information or the data when a predetermined condition is satisfied.
  • the transmission carrier selection or reselection is performed along with resource selection or reselection.
  • the carrier selection unit 105 preferentially selects or reselects a carrier used for transmission of the control information or the data as a transmission carrier of a synchronization signal.
  • the signal transmission unit 101 is configured to transmit data on the side link
  • the resource selection unit 104 is configured to continuously transmit data with a transmission power smaller than a predetermined threshold a predetermined number of times. Configured to perform resource reselection when it detects that.
  • the transmission of data by the signal transmission unit 101 may be transmission by a plurality of carriers to which power scaling is applied. Also, for example, the transmission power control unit 106 may calculate the predetermined threshold value using a reduction value from a predetermined transmission power, a predetermined minimum transmission power, or a predetermined scaling factor.
  • FIG. 22 is a diagram showing an example of a functional configuration of the base station 10.
  • the base station 10 includes a signal transmission unit 201, a signal reception unit 202, and a setting information management unit 203.
  • the functional configuration shown in FIG. 22 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the functional unit may be arbitrary.
  • the signal transmission unit 201 includes a function of generating a signal to be transmitted to the user apparatus UE side and wirelessly transmitting the signal.
  • the signal receiving unit 202 includes a function of receiving various signals transmitted from the user apparatus UE and acquiring, for example, higher layer information from the received signals.
  • the setting information management unit 203 stores various setting information to be transmitted to the user apparatus UE, various setting information received from the user apparatus UE, and setting information set in advance.
  • each functional block may be realized by one device physically and / or logically connected to a plurality of elements, or directly and two or more physically and / or logically separated devices. And / or indirectly (for example, wired and / or wirelessly) connected, and may be realized by the plurality of devices.
  • both the user apparatus UE and the base station 10 in an embodiment of the present invention may function as a computer that performs the process according to the present embodiment.
  • FIG. 23 is a diagram showing an example of the hardware configuration of the user apparatus UE and the base station 10 according to the present embodiment. Even if the above-mentioned user apparatus UE and base station 10 are physically configured as a computer apparatus including processor 1001, memory 1002, storage 1003, communication apparatus 1004, input apparatus 1005, output apparatus 1006, bus 1007, etc. Good.
  • the term “device” can be read as a circuit, a device, a unit, or the like.
  • the hardware configurations of the user apparatus UE and the base station 10 may be configured to include one or more devices indicated by 1001 to 1006 shown in the figure, or may be configured without including some devices. May be
  • Each function in the user apparatus UE and the base station 10 causes the processor 1001 to perform an operation by reading predetermined software (program) on hardware such as the processor 1001, the memory 1002, and the like, and communication by the communication apparatus 1004; And by controlling the reading and / or writing of data in the storage 1003.
  • predetermined software program
  • the processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU Central Processing Unit
  • the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these.
  • a program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
  • the 22 may be realized by a control program stored in the memory 1002 and operated by the processor 1001. Good.
  • the various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be done.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device) or the like.
  • the memory 1002 can store a program (program code), a software module, and the like that can be executed to execute the process according to the embodiment of the present invention.
  • the storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used.
  • the storage 1003 may be called an auxiliary storage device.
  • the above-mentioned storage medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or any other suitable medium.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the signal transmission unit 101 and the signal reception unit 102 of the user device 10 may be realized by the communication device 1004.
  • the signal transmission unit 201 and the signal reception unit 202 of the base station 10 may be realized by the communication device 1004.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured by a single bus or may be configured by different buses among the devices.
  • each of the user apparatus UE and the base station 10 includes a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured to include hardware, and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented in at least one of these hardware.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • FPGA field programmable gate array
  • configuration information management that holds information on one or more candidate carriers that can be used for transmitting a synchronization signal of a side link, which is a user apparatus in a wireless communication system
  • a carrier selection unit for selecting or reselecting a transmission carrier to be used for transmission of the synchronization signal from the one or more candidate carriers, and a signal for transmitting the synchronization signal using the transmission carrier
  • a user device characterized by comprising: a transmitter unit.
  • a user apparatus supporting sidelink multicarrier transmission can appropriately select a carrier to be used for transmission of a synchronization signal.
  • the carrier selection unit may preferentially select or reselect a carrier used for transmission of control information or data as a transmission carrier of the synchronization signal.
  • transmission of control information or data can be performed by a carrier that transmits a synchronization signal, and for example, a user apparatus UE that is not synchronized by GNSS can also receive the control information or data.
  • the carrier selection unit may perform selection or reselection of a transmission carrier of the synchronization signal at a predetermined cycle. By this configuration, it is possible to avoid selection or reselection of transmission carriers for frequent synchronization signals.
  • the carrier selection unit may perform selection or reselection of a transmission carrier of the synchronization signal together with selection or reselection of resources of control information or data when a predetermined condition is satisfied.
  • a user apparatus in a wireless communication system which selects or reselects a transmission carrier to be used for transmitting control information or data of a side link from one or more candidate carriers.
  • a signal transmission unit that transmits the control information or the data using the transmission carrier, and the carrier selection unit transmits the control information or the data when a predetermined condition is satisfied.
  • the carrier selection unit may preferentially select or reselect the carrier used for transmission of the control information or the data as a transmission carrier of a synchronization signal.
  • the above configuration enables a user apparatus supporting sidelink multicarrier transmission to appropriately select a carrier to be used for transmission of a synchronization signal.
  • the user apparatus in the wireless communication system wherein the signal transmission unit transmitting data on the side link and the transmission of data with a transmission power smaller than a predetermined threshold are predetermined.
  • a user apparatus characterized by including a resource selection unit that performs resource reselection when it is detected that a number of consecutive operations have been made.
  • the transmission of data by the signal transmission unit may be transmission by a plurality of carriers to which power scaling is applied. With this configuration, multiple carriers can be effectively performed.
  • the predetermined threshold may be calculated by a reduction value from a predetermined transmission power, a predetermined minimum transmission power, or a predetermined scaling factor. With this configuration, the threshold can be calculated appropriately.
  • the operations of multiple functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by multiple components.
  • the order of processing may be changed as long as there is no contradiction.
  • the user apparatus UE and the base station 10 have been described using functional block diagrams for the convenience of the processing description, such an apparatus may be realized in hardware, software or a combination thereof.
  • the software operated by the processor of the user apparatus UE according to the embodiment of the present invention and the software operated by the processor of the base station 10 according to the embodiment of the present invention are random access memory (RAM), flash memory, read only It may be stored in memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.
  • notification of information is not limited to the aspect / embodiment described herein, and may be performed by other methods.
  • notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block), other signals, or a combination thereof.
  • RRC signaling may be called an RRC message, for example, RRC Connection setup (RRC Con ection Setup) message, RRC connection reconfiguration (it may be a RRC Connection Reconfiguration) message.
  • Each aspect / embodiment described in the present specification is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-Wide Band),
  • the present invention may be applied to a system utilizing Bluetooth (registered trademark), other appropriate systems, and / or an advanced next-generation system based on these.
  • the specific operation supposed to be performed by the base station 10 in this specification may be performed by the upper node in some cases.
  • the various operations performed for communication with the user equipment UE may be performed by the base station 10 and / or other than the base station 10. It is clear that it may be done by a network node (for example but not limited to MME or S-GW etc).
  • a network node for example but not limited to MME or S-GW etc.
  • MME Mobility Management Entity
  • the user equipment UE may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote communication device, a mobile subscriber station, an access terminal, a mobile terminal, by a person skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.
  • Base station 10 may also be referred to by those skilled in the art with NB (Node B), eNB (enhanced Node B), Base Station, gNB, or some other suitable terminology.
  • NB Node B
  • eNB enhanced Node B
  • Base Station gNB
  • determining may encompass a wide variety of operations.
  • “Judgment”, “decision” are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision”, etc.
  • “determination” and “determination” are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (Accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”.
  • the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un dispositif utilisateur dans un système de communication sans fil, le dispositif utilisateur comprenant : une unité de gestion d'informations de paramétrage qui contient une ou plusieurs porteuses candidates qui peuvent être utilisées dans l'émission d'un signal de synchronisation de liaison latérale ; une unité de sélection de porteuse qui sélectionne ou qui re-sélectionne une porteuse d'émission utilisée dans l'émission du signal de synchronisation, parmi lesdites porteuses candidates ; et une unité d'émission de signal qui émet le signal de synchronisation à l'aide de la porteuse d'émission.
PCT/JP2017/041375 2017-11-16 2017-11-16 Dispositif utilisateur WO2019097656A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/041375 WO2019097656A1 (fr) 2017-11-16 2017-11-16 Dispositif utilisateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/041375 WO2019097656A1 (fr) 2017-11-16 2017-11-16 Dispositif utilisateur

Publications (1)

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WO2019097656A1 true WO2019097656A1 (fr) 2019-05-23

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Country Status (1)

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WO (1) WO2019097656A1 (fr)

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
3GPP: "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 14)", 3GPP TS 36.331 V14.4.0, vol. 28, September 2017 (2017-09-01), pages 227 - 235, XP055609634 *
INTEL CORPORATION: "Carrier Selection for CA over PC5", 3GPP TSG RAN WG2 MEETING #99BIS R2-1710651, vol. RAN WG2, 29 September 2017 (2017-09-29), XP051355071 *
OPPO: "Resource selection in CA -based eV2x", 3GPP TSG-RAN2 MEETING #99BIS R2-1710145, vol. RAN WG2, 28 September 2017 (2017-09-28), XP051354224 *

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