WO2016021653A1 - ユーザ装置、基地局、及び異周波d2d信号モニタリング方法 - Google Patents
ユーザ装置、基地局、及び異周波d2d信号モニタリング方法 Download PDFInfo
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- WO2016021653A1 WO2016021653A1 PCT/JP2015/072267 JP2015072267W WO2016021653A1 WO 2016021653 A1 WO2016021653 A1 WO 2016021653A1 JP 2015072267 W JP2015072267 W JP 2015072267W WO 2016021653 A1 WO2016021653 A1 WO 2016021653A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/104—Peer-to-peer [P2P] networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/021—Traffic management, e.g. flow control or congestion control in wireless networks with changing topologies, e.g. ad-hoc networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to D2D communication (communication between user apparatuses), and particularly relates to a technique for monitoring D2D signals of different frequencies in D2D communication.
- each user apparatus UE uses a part of the uplink resource that is already defined as an uplink signal transmission resource from the user apparatus UE to the base station eNB.
- the base station eNB assists in allocating resources used in D2D communication.
- D2D communication using Bluetooth (registered trademark), WiFi (registered trademark), or the like has existed in the past.
- terminal detection independent of the operator is possible.
- D2D using the LTE network In Discovery it is desirable that user device detection (inter-provider D2D) can be performed between user devices of different business operators.
- the user apparatus UE performs transmission and reception of D2D signals on the carrier of the connected cell (frequency band, more specifically, a predetermined frequency carrier in the band), but generally, carriers used differ between operators.
- the carrier of the connected cell frequency band, more specifically, a predetermined frequency carrier in the band
- carrier A when carrier A is used for D2D communication in carrier A and carrier B is used for D2D communication in carrier B, user device UE of carrier A
- the user apparatus UE of the provider B In order to receive the D2D signal transmitted by the user apparatus UE of the person B, it is necessary to switch the carrier A to the carrier B and monitor the D2D signal.
- the user apparatus UE of the provider B needs to switch the carrier B to the carrier A and monitor the D2D signal in order to receive the D2D signal transmitted by the user apparatus UE of the provider A.
- the monitoring with the carrier switching needs to be performed in a short period in order not to inhibit communication with the cell.
- LTE D2D communication is configured such that available resources (resource pools) of cellular communication resources periodically arrive
- the base station eNB generally arrives at the arrival timing of D2D resources of other operators. Therefore, the time when the carrier can be switched does not always match the arrival timing of the D2D resource. Therefore, it is conceivable that the D2D signal monitoring by short-term carrier switching as described above cannot detect the D2D signal of another operator or delays the detection. On the other hand, if the monitoring period is made longer, it becomes easier to detect the D2D signal, but the cellular communication and the D2D signal transmission / reception in the same frequency in the connected cell are hindered.
- performing D2D signal monitoring at a frequency different from the frequency used in its own connection or in the serving cell as in the other company D2D signal monitoring is referred to as different frequency D2D signal monitoring.
- the present invention has been made in view of the above points, and in a mobile communication system, a user apparatus efficiently performs different frequency D2D signal monitoring without hindering cellular communication and transmission / reception of the same frequency D2D signal as much as possible.
- the purpose is to provide a technology that makes it possible.
- a user apparatus used in a mobile communication system supporting D2D communication, Measurement gap control means for transmitting a measurement gap setting request for monitoring a different frequency D2D signal to a base station of a connected or in-zone cell;
- Measurement gap control means for transmitting a measurement gap setting request for monitoring a different frequency D2D signal to a base station of a connected or in-zone cell;
- a user apparatus including D2D communication means for monitoring the different frequency D2D signal using the measurement gap set based on the setting request.
- a base station used in a mobile communication system supporting D2D communication, Receiving means for receiving a measurement gap setting request for monitoring a different frequency D2D signal transmitted from the user device at a frequency different from the frequency used for D2D signal transmission by the user device; There is provided a base station comprising measurement gap control means for setting the measurement gap for the user apparatus based on measurement gap setting information included in the setting request.
- a different frequency D2D signal monitoring method executed by a user equipment and a base station used in a mobile communication system supporting D2D communication,
- the user equipment transmitting a measurement gap setting request for monitoring a different frequency D2D signal to the base station;
- the base station transmitting a response to the setting request to the user equipment;
- the user apparatus is provided with a step of monitoring the different frequency D2D signal using the measurement gap.
- a technique that enables a user apparatus to efficiently perform different frequency D2D signal monitoring without hindering cellular communication and transmission / reception of the same frequency D2D signal as much as possible. can be provided.
- LTE is not only a communication system corresponding to Release 8 or 9 of 3GPP but also a communication system corresponding to Release 10, 11 or 12 of 3GPP or later. Used in a broad sense including
- D2D signals used in Discovery and Communication are collectively referred to as D2D signals.
- the present invention is not limited to D2D communication between operators, but can be applied to the case where different carriers are used between cells in the same operator.
- FIG. 2 shows a configuration example of a communication system in the embodiment of the present invention.
- the communication system in the present embodiment includes the base station eNB (A) of the carrier A, the user equipment UE (A) under its control, and the base station eNB (B) of the carrier B And user equipment UE (B) under its control.
- Carriers A and B use different carriers for D2D communication.
- Each user apparatus UE has a function of performing normal cellular communication and a D2D communication function.
- user apparatus UE (A) grasps
- user device UE and “base station eNB” without showing operators A and B, unless otherwise specified, user device UE (A) in the role of operator A in FIG. A base station eNB (A) is assumed.
- the “measurement gap” used for transmission or reception of the D2D signal may be referred to as a “D2D gap”.
- the user apparatus UE knows the resource configuration of the D2D communication of the other provider by receiving the broadcast information of the other provider from the base station of the other provider.
- step S101 the user apparatus UE transmits a gap setting request to the base station eNB.
- This gap setting request includes information (eg, period, gap length, etc.) specifying a measurement gap set in the user apparatus UE and the base station eNB.
- a frequency that the user apparatus UE desires to receive or transmit may be included.
- the base station eNB knows the D2D resource configuration information of other frequencies in advance, it is possible to set an appropriate gap only with a simple request from the user apparatus UE. Therefore, you may notify the list
- the gap setting request may include the other provider D2D resource configuration information (resource pool arrival period, time length, etc.) itself.
- the base station eNB sets a measurement gap for the user apparatus UE and returns a gap setting response to the user apparatus UE (step S102).
- the gap setting response includes, for example, information indicating that the gap setting is allowed, and does not need to include a period related to a request from the user apparatus UE, a gap length, and the like.
- the gap setting request may be transmitted by being included in the request / notification of D2D reception or D2D transmission.
- the user apparatus UE that has received the gap setting response sets the measurement gap with the content requested in step S101.
- the base station eNB may instruct the user apparatus UE to set a measurement gap different from the request in the gap setting response.
- “Setting the measurement gap” means that, in the base station eNB, a setting is made so that signals are not transmitted to or received from the user apparatus UE (scheduling is not performed) in a predetermined period that periodically arrives. Yes, in the user apparatus UE, setting is performed so that signals are not transmitted to and received from the base station eNB in the predetermined period synchronized with the base station eNB side.
- step S103 the user apparatus UE switches the received carrier to the carrier (frequency) of the other provider in the measurement gap, and monitors the D2D signal transmitted from the user apparatus UE of the other provider.
- monitoring means, for example, receiving a D2D signal of another provider, and attempting demodulation and decoding.
- Monitoring may be rephrased as “reception”. For example, if the D2D signal is a Discovery signal, the user apparatus UE of another provider can be recognized as a nearby D2D terminal when the Discovery signal is successfully decoded.
- user apparatus UE may receive notification by the alerting
- step S103 normal cellular communication can be performed in a period other than the measurement gap.
- the user apparatus UE can receive broadcast information from the base station of another provider, for example, using the measurement gap or another period, and acquire D2D resource configuration information.
- the user apparatus UE recognizes the change and transmits a gap change request for requesting the measurement gap setting after the change to the base station eNB. (Step S104), a gap change response is received from the base station eNB (Step S105). Thereby, the measurement gap after a change is set in the user apparatus UE and the base station eNB, and the user apparatus UE can monitor the other operator D2D signal using the measurement gap after the change (step). S106).
- the user apparatus UE transmits a gap release request to the base station eNB, for example, when it is no longer necessary to monitor the different frequency D2D signal (step S107).
- the base station eNB that has received the gap release request releases the measurement gap that has been set and releases the measurement gap. Thereby, the period which was a measurement gap can be used for cellular communication. Further, the user apparatus UE may release the measurement gap by using the transmission of the gap release request as a trigger, or release the measurement gap by using the reception of the response from the base station eNB to the gap release request as a trigger. Also good.
- the measurement gap may be collectively set by notification (SIB or the like) or (E) PDCCH Common search space. Further, there is no need to request a gap for each user apparatus UE (a measurement gap may be set without requesting a gap), and there is a mismatch between the allocated measurement gap and the D2D resource monitored by the user apparatus UE. A request need only be made if it occurs.
- the base station eNB can obtain information equivalent to or higher than the exchange of the D2D configuration using the backhaul, for example. Moreover, the base station eNB can set the measurement gap according to a request
- gap change request for example, it is possible to follow changes in the D2D configuration of other operators.
- the user apparatus UE stops performing another provider D2D monitoring due to the gap release request it is possible to release an unnecessary gap and increase cellular communication resources.
- Transmission of the D2D signal in LTE is performed using a part of resources in the time-frequency domain (D2D resource pool) allocated for D2D that arrives periodically (eg, Discovery period). Therefore, in the present embodiment, the user apparatus UE acquires the D2D resource configuration information (the period of arrival of the D2D resource pool, the time length of the D2D resource pool, etc.) from the broadcast information received from the base station of another provider, Based on this, a measurement gap is set by transmitting a gap setting request.
- D2D resource pool the time-frequency domain allocated for D2D that arrives periodically (eg, Discovery period). Therefore, in the present embodiment, the user apparatus UE acquires the D2D resource configuration information (the period of arrival of the D2D resource pool, the time length of the D2D resource pool, etc.) from the broadcast information received from the base station of another provider, Based on this, a measurement gap is set by transmitting a gap setting request.
- FIG. 4 shows an example of the measurement gap in the present embodiment.
- the D2D resource pool is allocated to the uplink resources of other operators. Note that the D2D resource pool takes a part of the length of the uplink resource also in the frequency direction, but in this example, in order to make the explanation easy to understand, the D2D resource pool is illustrated focusing on the time direction.
- the measurement gap shown in FIG. 4 set in the user apparatus UE and the base station eNB is set to match the arrival period and the time length of the D2D resource pool.
- the D2D signal transmitted from the user device of another business operator transmitted by a part of the resources of the D2D resource pool is monitored.
- the “D2D resource pool” described here may be interpreted as an individual D2D subframe indicated by a bitmap in the D2D resource configuration described later with reference to FIG. It may be interpreted that it is a period during which a sub-frame for use can exist (a period indicated by A, B, C, etc. in FIG. 17).
- the time length of the measurement gap and the time length of the D2D resource pool may be matched as shown in FIG. 4, or the time length of the measurement gap may be longer than the time length of the D2D resource pool.
- the time length of the measurement gap By making the time length of the measurement gap longer than the time length of the D2D resource pool (that is, by including it), the time lag can be covered.
- the time length of the measurement gap is set to the time of the D2D resource pool. The time position may be shorter than the length, and the time position may be adjusted to the time position at which the D2D signal can be transmitted.
- the user apparatus UE determines the arrival period of the D2D resource pool (eg, SFN or / and subframe interval, etc.) from the D2D resource configuration information received from the base station of another provider. ), Start position (offset value, eg, pool start subframe number in the first frame where the D2D resource pool exists), time length (eg, number of subframes), etc.
- the base station eNB includes the gap setting request including the arrival period, start position, time length, etc. of the other operator D2D resource pool, converted into the parameters (SFN, subframe, etc.) Send to.
- the base station eNB sets a measurement gap as shown in FIG. 4, for example, based on the received information.
- the user apparatus UE also sets the same measurement gap.
- the “connected or in-zone cell” is a cell to which the UE is connected or located, and may be referred to as a serving cell.
- a gap setting request may be transmitted for each other company.
- an ID may be assigned for each measurement gap, and the ID may be sent in the gap setting request.
- the measurement gap setting information and the ID can be held in association with each other. For example, by transmitting a gap change request / release request specifying the ID, the corresponding measurement can be performed. The gap can be changed / released efficiently. Note that an ID may be assigned even when there is one measurement gap.
- Fig. 5 shows an example of setting multiple measurement gaps.
- the gap B for the D2D signal of the other operator B and the gap A for the D2D signal of the other operator A are set. If a plurality of gaps overlap or continue, these may be used by merging. Moreover, it is good also as setting the measurement gap for receiving the alerting signal of another provider.
- the D2D signal of the other provider can be monitored efficiently with the minimum gap time.
- an upper layer signaling signal such as RRC or MAC may be used, or PUCCH may be used.
- an upper layer signaling signal such as RRC or MAC may be used, or (E) PDCCH may be used.
- the gap setting request or gap change request only needs to include information indicating the measurement gap arrival period, measurement gap time length (duration), measurement gap start position, etc.
- the format is not limited.
- existing measurement gap setting information can be used.
- the above information is information created by the user apparatus UE based on the D2D resource configuration information received from the other provider base station. Instead, the user apparatus UE makes a gap setting request / gap change request,
- the D2D resource configuration information (resource pool information, synchronization signal resource information, etc.) received from another provider base station may be included.
- the base station eNB creates information indicating the arrival period, time length (duration), and start position for the own cell from the D2D resource configuration information, sets a measurement gap, and sets these information as gaps.
- the measurement gap is also set in the user apparatus UE.
- the gap setting request / gap change request includes “gap type”, “monitored PLMN, band or carrier”, “D2D resource configuration information” (period, time length, start position as main Or any one or more (including all) of the “gap ID” may be included.
- “Gap type” assumes that the set measurement gap is used for multiple types of applications. For example, “different frequency D2D monitoring”, “different frequency FDD LTE monitoring”, etc. is there.
- the base station eNB can grasp that this is for D2D, for example, and set a similar gap for other user apparatuses UE that desire D2D monitoring. It becomes possible to set.
- the “gap type” may be notified from the base station eNB to the user apparatus UE. In this case, the user apparatus UE may perform a measurement that matches the “gap type” or may perform a desired measurement regardless of the “gap type”.
- “Monitored PLMN, band or carrier” indicates which band or carrier of which operator's network is to be monitored, but this information is not included in the gap setting request / gap change request, It may be included in the response / gap change response.
- FIG. 6 An example of information included in the gap setting request and the gap setting response will be described with reference to FIG. 6 in the example of FIG. 6, there are an operator A and an operator B as shown.
- the user apparatus UE1 acquires D2D resource configuration information by receiving broadcast information from the base station eNB (B) of the carrier B. Based on this information, the user apparatus UE1 determines the measurement gap period / time length / start position and the like to be set, and transmits a gap setting request including these to the base station eNB (A) (step S202).
- the base station eNB holds the period / time length / start position as measurement gap information for different frequency D2D signal monitoring.
- a gap setting response is returned from the base station eNB (A) to the user apparatus UE1 (step S203).
- the gap setting response only needs to include information indicating OK, for example. This is because the user apparatus UE1 knows the period / time length / start position of the measurement gap to be set.
- the gap setting response includes the period / Time length / start position information may be included.
- the user apparatus UE that has received the gap setting response in step S203 may set a measurement gap and monitor the D2D signal transmitted from the user apparatus UE-X of the operator B, for example, using the measurement gap. it can.
- the user apparatus UE2 of the business operator A transmits a gap setting request indicating that it is desired to perform different frequency D2D signal monitoring, for example, without including information on the period / time length / start position (step S204).
- the gap setting request as in step S204 can be transmitted.
- the base station eNB that has received the gap setting request sets the measurement gap for the user apparatus UE2 using the information on the period / time length / start position that is already held, and information on the period / time length / start position Is returned to the user apparatus UE2 (step S205).
- user apparatus UE2 can set an appropriate measurement gap and can perform different frequency D2D signal monitoring. Such control can reduce signaling overhead.
- transition to the DRX (discontinuous reception) state may be performed.
- the user apparatus UE transmits a DRX setting request to the base station eNB (step S301).
- This DRX setting request may include, for example, transition timing to DRX (SFN, subframe number, etc.) and DRX configuration information (cycle, time length of active period, etc.).
- the base station eNB that has received this DRX setting request holds the DRX information as DRX setting information for the user apparatus UE, and performs DRX in synchronization with the user apparatus UE according to the setting information (does not schedule inactive period) etc).
- Step S302 a DRX setting response is returned from the base station eNB to the user apparatus UE.
- the user apparatus UE makes a transition to the requested DRX or the like using this response as a trigger.
- the information included in the DRX setting request may be any information as long as it is information indicating the transition timing to DRX and what kind of DRX is performed (such as the period and the length of the active period). For example, information similar to existing DRX configuration information may be used.
- DRX setting may be performed by transmitting a DRX setting request including DRX setting information as described above.
- different frequencies D2D It may be set assuming monitoring.
- the setting contents include drx-InactivityTimer, DRX Cycle, drx-RetransmissionTimer, onDurationTimer, various offset values, and the like (for details, refer to Non-Patent Documents 2 and 3, for example).
- FIG. 8 shows an example in which different frequency D2D signal monitoring is performed when the user apparatus UE is in the DRX state.
- the user apparatus UE in the DRX state monitors the carrier (frequency) of the different frequency D2D signal in an inactive period (a period in which signal transmission / reception is not performed with the connected cell).
- the D2D signal monitoring (demodulation and decoding trial) may be performed only during the period of the resource pool.
- the user apparatus UE since the user apparatus UE has received the PDCCH addressed to the user apparatus UE in the active period, it is indicated that the user apparatus UE continues to be active thereafter.
- the transition to the DRX state based on the DRX setting request may be performed after retransmission (for example, L1 or L2 retransmission) is completed.
- a DRX state may occur when a measurement gap is provided. Also, when a measurement gap is provided, an existing DRX state may occur. In such a case, the measurement gap and DRX on duration (active section) may collide. In such a case, priority is given to on duration as shown in FIGS. 9A and 9B.
- the PDCCH may be monitored.
- the gap request and / or the DRX transition request may be made only by the user apparatus UE that has been authenticated for the different frequency D2D monitoring.
- identification information of a user apparatus UE that allows different frequency D2D monitoring is registered, and for example, the user apparatus UE requests a gap and / or DRX transition.
- a request for gap and / or a request for DRX transition is triggered by transmitting an authentication request by transmitting identification information to the authentication device and receiving an authentication OK from the authentication device. To be able to do.
- different frequency D2D configuration information (such as resource pool settings) acquired by the user apparatus UE may be reported to a connected or in-zone cell.
- the report may be performed based on an instruction from the base station eNB.
- higher layer signaling including SIB, RRC signaling and MAC
- E PDCCH / PUCCH
- the user apparatus UE may notify the UE capability (capability) indicating whether or not different frequency D2D signal monitoring is supported to the base station eNB by higher layer signaling.
- the user apparatus UE When notifying the UE capability indicating that the different frequency D2D signal monitoring is supported, the user apparatus UE notifies the list of bands (and / or frequency carriers) supporting the different frequency D2D signal monitoring.
- the base station eNB may consider that the LTE or D2D support band notified by the user apparatus UE also supports different frequency D2D monitoring.
- a gap setting capability may be notified as capability information.
- the user apparatus UE may notify the base station eNB of the necessity of gap setting. For example, when the user apparatus UE holds a plurality of receivers including a receiver that can monitor the different frequency D2D signal, and the different frequency D2D monitoring is possible without a gap, a notification indicating that the gap setting is not necessary. You can do it.
- an operation notification may be performed regarding whether or not to perform different frequency D2D signal monitoring (whether or not to perform the different frequency D2D signal monitoring).
- FIG. 10 shows a sequence example related to UE capability notification and operation request notification.
- the user apparatus UE notifies the base station eNB of capability information indicating that the different frequency D2D signal monitoring is supported or that the different frequency D2D signal monitoring is desired (step). S401). It is assumed that the base station eNB holds gap setting information suitable for different frequency D2D signal monitoring by a gap setting request or the like from another user apparatus UE. Since the base station eNB can grasp that the user apparatus UE is capable of monitoring different frequency D2D signals (desired) based on the information received in step S401, the base station eNB sends a gap setting notification including the gap setting information to the user apparatus UE. It can be transmitted (step S402). Thereby, user apparatus UE can set a measurement gap and can perform different frequency D2D signal monitoring.
- a measurement gap suitable for different frequency D2D signal monitoring is set for other user apparatuses UE. It becomes possible to set.
- the base station eNB can know the user apparatus UE which should set the measurement gap suitable for different frequency D2D signal monitoring by capability notification.
- each measurement gap may be a continuous subframe or a discontinuous subframe. There may be. Thus, various subframe patterns can be taken in the measurement gap.
- the minimum unit of the subframe pattern is referred to as a D2D gap block (hereinafter “gap block”).
- gap block the minimum unit of the subframe pattern
- the gap block arrives at predetermined time intervals (gap intervals), for example, as shown in FIG. As will be described later with reference to FIG. 16, the gap interval may be sequentially changed by time hopping.
- FIGS. 11A and 11B show gap block A and gap block B that are separated by a predetermined time interval.
- each gap block is composed of 7 subframes, and each gap block includes a D2D signal receivable subframe and other subframes.
- the D2D signal receivable subframe is a subframe for receiving (monitoring) a target D2D signal of a different frequency
- the subframe is a gap with respect to the cellular signal of the serving cell (period in which communication is not performed). It becomes.
- the base station eNB does not transmit a DL signal to the user apparatus UE during the period.
- the cellular signal is a signal that is not a D2D signal and is transmitted and received between a normal base station eNB and the user apparatus UE.
- the gap block configuration information (cycle, time length, start time position, etc.) is the same as the “measurement gap” setting described with reference to FIGS. Can be determined and set based on
- the arrangement pattern of D2D signal receivable subframes (gap for the serving cell) in the gap block (which subframe is used as a gap) may be determined in advance, or may be determined from the base station eNB to the user apparatus UE. On the other hand, it may be set to be included in the gap setting response, or may be set by signaling different from the gap setting response.
- the pattern may be common among UEs (common within a cell) and set with broadcast information, or may be set with UE-specific RRC signals as UE-specific.
- the arrangement pattern may be set so as to match the subframe indicating the D2D resource represented by the bitmap in the D2D resource configuration information of the other provider.
- the user apparatus UE can receive downlink data by receiving downlink resource allocation by the above (E) PDCCH reception, and can provide feedback such as ACK / NACK in the gap block in which the gap is released. It can also be returned.
- the user apparatus UE can receive uplink resource allocation (UL grant) by receiving the (E) PDCCH, and can transmit uplink data, and ACK / NACK within the gap block in which the gap is released. It is also possible to receive feedback such as.
- UL grant uplink resource allocation
- (E) the operation of releasing the gap in the gap block is performed triggered by reception of a DL signal such as PDCCH, but the user apparatus UE It is good also as performing the operation
- the gap is set in accordance with the arrangement pattern (unless there is no discard trigger).
- the UL signal serving as a trigger for discarding the gap is, for example, SR (Scheduling Request), BSR (Buffer Status Report), RACH preamble, or the like.
- SR Service Request
- BSR Buffer Status Report
- RACH preamble RACH preamble
- the user apparatus UE has mainly described that the different frequency D2D signal is received in the measurement gap. However, the user apparatus UE may transmit the different frequency D2D signal in the measurement gap.
- Whether the user apparatus UE performs D2D signal transmission in the measurement gap may be defined as an operation of the user apparatus UE, or may be instructed from the base station eNB to the user apparatus UE by signaling.
- signaling of the instruction for example, broadcast information (in the case of common to UEs) and UE individual RRC signal (in the case of UE individual setting) are used.
- the signal for signaling the instruction is not limited to these, and may be performed by, for example, a MAC signal or a PHY signal.
- the DL signal reception of the serving cell is disabled in the measurement gap.
- the serving cell UL signal transmission in the measurement gap may be disabled as in the case of DL signal reception, or UL signal transmission may be allowed.
- D2D signal transmission When allowing the UL signal transmission of the serving cell in the measurement gap, three of D2D signal transmission, D2D signal reception, and cellular UL signal transmission may occur simultaneously during the gap period. However, only one of them can be implemented at the same time. Therefore, in this embodiment, priority may be given to cellular UL signal transmission among these. For example, when a trigger for cellular UL signal transmission (occurrence of SRS / CQI / ACK / NACK timing, generation of UL data, etc.) occurs, cellular UL signal transmission is performed without performing either D2D signal transmission or D2D signal reception. Can be done. Such an operation can suppress a decrease in cellular performance as much as possible.
- a trigger for cellular UL signal transmission occurrence of SRS / CQI / ACK / NACK timing, generation of UL data, etc.
- the UL transmission may not be performed together with the DL signal reception of the serving cell.
- the performance of D2D improves in exchange for deterioration of cellular performance.
- whether or not to perform UL transmission in the measurement gap may be determined according to the type of cellular UL signal, for example, periodic SRS transmission in the same carrier may not be performed. This is because even if periodic SRS transmission is not performed, the performance of cellular communication is not greatly affected.
- UL transmission such as CQI and ACK / NACK may greatly affect the performance of cellular communication of the user apparatus UE. Therefore, in the measurement gap, transmission may be performed with priority over D2D signal transmission / reception. Good.
- Which operation the user apparatus UE performs with what priority may be defined as the operation of the user apparatus UE, and which operation is to be performed is indicated by signaling from the base station eNB to the user apparatus UE May be.
- signaling of the instruction for example, broadcast information (in the case of common to UEs) and UE individual RRC signal (in the case of UE individual setting) are used.
- the signal for signaling the instruction is not limited to these, and may be performed by, for example, a MAC signal or a PHY signal.
- the user apparatus UE and the base station eNB basically set a measurement gap based on the D2D resource configuration information of another provider for different frequency D2D signal monitoring.
- time hopping may be used independently regardless of the D2D resource configuration information.
- time hopping is applied to the measurement gap to increase the probability that the user apparatus UE can receive a different frequency D2D signal as much as possible even when the D2D resource configuration of another operator cannot be grasped.
- a specific example of the time hopping pattern will be described later.
- FIG. 12 shows an example of the measurement gap in the modified example.
- the D2D resource pool is allocated to the uplink resources of other carriers.
- the measurement gap is set in the user apparatus UE and the base station eNB as illustrated.
- the measurement gap is time-hopped, and FIG. 12 schematically shows three measurement gaps AC that are time-hopped.
- the measurement gap indicated by B overlaps with the D2D resource pool of the other provider, and the user apparatus UE can receive the D2D signal having a different frequency transmitted from the user apparatus UE of the other provider in this gap.
- the user apparatus UE can receive the D2D signal having a different frequency transmitted from the user apparatus UE of the other provider in this gap.
- a different frequency D2D signal transmitted from the user apparatus UE can be received by the user apparatus UE of another provider.
- FIG. 13 shows an image when time hopping is applied to the measurement gap.
- measurement gaps to which time hopping is applied sequentially arrive at the user equipment UE (and base station eNB) in PLMN-A (operator A) (in the figure). Subframe with shading).
- a D2D resource pool is set for each of carrier 1 and carrier 2, and a D2D signal is transmitted using the D2D resource pool. It has been shown.
- the user apparatus UE of the operator A does not grasp the configuration information of the D2D resources in the operators B and C, but overlaps the D2D resource pool in the operators B and C by using the measurement gap to which time hopping is applied. It can be seen that a measurement gap has occurred. If the measurement gap is set periodically without time hopping, and the period is almost the same as the period of the other operator's D2D resource pool, the measurement gap at the start of the other operator's If it does not overlap with the D2D resource pool, the measurement gap does not overlap with the D2D resource pool of the other operator even if time elapses, and the user apparatus UE cannot receive the D2D signal of the other operator.
- the base station eNB transmits gap configuration information (gap configuration) to the user apparatus UE (step S501).
- the user apparatus UE receives the gap configuration information from the base station eNB and applies the gap configuration information (step S502).
- the notification of the gap configuration information in step S501 can be performed using, for example, broadcast information (SIB or the like).
- the notification of the gap configuration information may be performed using a UE-specific RRC signal.
- the notification of the D2D gap configuration information may be performed using a MAC signal, a PHY signal, or the like.
- the base station eNB holds gap configuration information applied to each user apparatus UE, and can always grasp whether each user apparatus UE is in the gap. Accordingly, the base station eNB can perform control such that downlink and / or uplink scheduling is not performed in the gap period, for example.
- the signaling shown in FIG. 14 sets a time hopping pattern as a subframe arrangement pattern for a measurement gap (eg, gap block) that has already been set by the method described so far (eg, FIG. 3). Signaling may be used.
- a measurement gap eg, gap block
- FIG. 15 shows a time hopping pattern example 1 as a configuration example of a measurement gap to which time hopping is applied.
- the gap configuration information notified from the base station eNB to the user apparatus UE includes, for example, a gap period indicating a measurement gap period, a gap interval indicating an interval between gap periods, and a time hopping pattern. included.
- an offset value indicating a time position at which the first gap period starts and / or a gap size that is a unit time length for performing time hopping within the gap period may be included.
- a time length of one gap size may be called a “slot” for convenience.
- the serving cell SFN System Frame Number
- DFN D2D Frame Number
- SFN SFN or A subframe number or the like in the DFN
- SFN, DFN, subframe number, and the like can be used as a reference time for setting a measurement gap.
- all or a part of the above information may be a predetermined value (a value that the UE knows without receiving notification).
- the base station eNB does not need to notify the user apparatus UE of the gap configuration information. Or it is good also as notifying the information which instruct
- the gap period for 7 slots arrives periodically with a gap interval.
- a time hopping pattern ⁇ 1, 3, 7, 0, 6, 2, 4, 5, 0 ⁇ is notified to the user apparatus UE.
- the time hopping pattern indicates a slot number set as a gap for each gap period.
- the user apparatus UE that has received the notification of the time hopping pattern ⁇ 1, 3, 7, 0, 6, 2, 4, 5, 0 ⁇ Slot 1 of the first number (1) of the hopping pattern is a gap, and slot 3 of the second number (3) of the time hopping pattern is a gap in the next gap period. The same applies thereafter.
- FIG. 16 shows a time hopping pattern example 2 as a configuration example of a measurement gap to which time hopping is applied.
- the gap configuration information notified from the base station eNB to the user apparatus UE includes, for example, gap block information, a gap interval indicating an interval between gap blocks, and a gap offset indicating a start time position of the first gap block. Is included.
- the “gap block” is as described with reference to FIG.
- the information on the gap block includes, for example, the length of the gap block (time length), information on subframes to be measured gaps in the block (information indicating which subframe is to be a gap), and the like.
- the gap interval is determined by the time hopping pattern, and the gap block arrives while time hopping.
- the time hopping pattern for example, an explicit pattern is notified from the base station eNB to the user apparatus UE as in Example 1, and the gap interval is changed while sequentially referring to the numbers in the pattern as in Example 1. Go.
- the base station eNB notifies the user apparatus UE of the determined initial value (random number seed or the like), and the user apparatus UE uses the time hopping pattern from the determined initial value. May be determined.
- the determination method is not limited to a specific method. For example, a mathematical expression that outputs a pattern such as ⁇ 1, 3, 7, 0, 6, 2, 4, 5, 0 ⁇ corresponding to the determination initial value is used. Alternatively, a plurality of types of patterns may be held and a pattern corresponding to the determined initial value may be used. Also in Example 1, such a method using the determined initial value may be adopted.
- ⁇ Gap offset may be used as the above initial value for determination. Further, the ID (UE-ID) of the user apparatus UE may be used as the determination initial value.
- the interval between gap blocks is time-hopped, but a subframe as a gap in the gap block may be time-hopped.
- a subframe as a gap in the gap block may be time-hopped.
- the gap block itself is set using the D2D resource configuration information by the method described with reference to FIG. 3 and the like, and the subframe to be a gap in the gap block is time-hopped. That is, this is an example of combining D2D resource configuration information and time hopping.
- the basic operation procedure in this example is the procedure shown in FIG. That is, first, it is assumed that the user apparatus UE has grasped the resource configuration of the D2D communication of the other provider by receiving the broadcast information of the other provider from the base station eNB of the other provider.
- step S101 of FIG. 3 the user apparatus UE transmits a gap setting request to the base station eNB.
- This gap setting request includes, for example, the configuration information of the D2D resource of the other provider acquired by the user apparatus UE with the broadcast information.
- the base station eNB determines (sets) gap configuration information including a gap block for the user apparatus UE and a time hopping pattern in the block, and includes the gap configuration information for the user apparatus UE.
- a gap setting response is returned (step S102).
- the user apparatus UE that has received the gap setting response applies the gap configuration information included in the gap setting response received in step S102, and monitors the different frequency D2D signal in the measurement gap.
- movement demonstrated so far such as priority operation
- the user apparatus UE when the D2D resource configuration information of another operator is changed, the user apparatus UE recognizes the change based on the broadcast information received from the base station eNB of the other operator, and sets the measurement gap setting after the change.
- a gap change request for requesting is transmitted to the base station eNB (step S104), and a gap change response (gap configuration information after change) is received from the base station eNB (step S105).
- the user apparatus UE can monitor the other company D2D signal using the changed measurement gap (step S106).
- the user apparatus UE transmits a gap release request to the base station eNB, for example, when it is no longer necessary to monitor the D2D signal of another provider (step S107).
- FIG. 17 is a diagram illustrating a configuration example of a D2D resource. This is a diagram focusing on the configuration in the time direction.
- the D2D resource is represented as a subframe bitmap. The bitmap is num. Repeated for the number of repetitions. Also, an offset indicating the start position in each period (period) is specified.
- the user apparatus UE acquires the bitmap, the period, the offset, the number of repetitions, and the like illustrated in FIG. 17 as the D2D resource configuration information of the other provider from the broadcast information, and uses this as the base station eNB Notify
- the notification of the D2D resource configuration information of another provider from the user apparatus UE to the base station eNB is an example, and the base station eNB acquires the D2D resource configuration information of the other provider by, for example, inter-base station communication, Gap configuration information may be created from the D2D resource configuration information and notified to the user apparatus UE.
- the base station eNB determines a gap block and a time hopping pattern as shown in FIG. 18, and notifies the user apparatus UE of the determined content as gap configuration information.
- each block indicated by A, B, and C is a gap block, and corresponds to the block of D2D resources indicated by A, B, and C in FIG. 17. That is, in the present modification, a block that may transmit / receive a D2D signal is set as a gap block.
- the gap block configuration information notified to the user apparatus UE includes the gap block time length, period, offset, and the like.
- the measurement gap is set by the time hopping pattern without considering the actual bitmap.
- the measurement gap is set with a time hopping pattern without considering the actual bitmap. Yes.
- FIG. 18 shows a schematic example.
- a gap is set in the first subframe in the gap block A, and a gap is set in the third subframe in the gap block B.
- a gap is set in the second subframe.
- the setting of the time hopping pattern can be executed by notification of an actual pattern, notification of an initial value, autonomous setting by UE-ID, and the like, for example, as in the example described with reference to FIGS. .
- FIG. 19 shows a functional configuration diagram of the user apparatus UE according to the present embodiment.
- the user apparatus UE includes a signal transmission unit 101, a signal reception unit 102, a D2D communication function unit 103, a D2D resource information acquisition unit 104, a measurement gap control unit 105, and a DRX control unit 106.
- FIG. 19 shows only functional units that are particularly related to the embodiment of the present invention in the user apparatus UE, and has at least a function (not shown) for performing an operation based on LTE.
- the functional configuration shown in FIG. 19 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 function unit may be anything.
- the signal transmission unit 101 includes a function of generating and wirelessly transmitting various physical layer signals from higher layer signals to be transmitted from the user apparatus UE.
- the signal transmission unit 101 has a transmission function for D2D communication and a transmission function for cellular communication.
- the signal receiving unit 102 includes a function of wirelessly receiving various signals from other user apparatuses UE or the base station eNB, and acquiring higher layer signals from the received physical layer signals.
- the signal receiving unit 102 has a reception function for D2D communication and a reception function for cellular communication.
- the D2D communication function unit 103 includes a function of a D2D application, and executes Discovery signal transmission / reception control, D2D data transmission / reception control, and the like. Further, the D2D communication function unit 103 also has a function of monitoring the D2D signal (decoding trial or the like) in the measurement gap / DRX inactive period.
- the D2D resource information acquisition unit 104 acquires the D2D resource information from the broadcast information received from another provider base station or the like and stores it in the memory or the like. Further, the D2D resource information acquisition unit 104 also has a function of reporting D2D resource information to the base station eNB.
- the measurement gap control unit 105 executes the processing related to requesting, changing, setting, releasing, etc. of the measurement gap and the capability information notification described so far. For example, the measurement gap control unit 105 creates measurement gap information (period, time length, etc.) of a connected or in-zone cell from the D2D resource information, and transmits it in a gap setting request.
- the measurement gap control unit 105 includes a function of receiving gap configuration information from the base station and setting a measurement gap to which time hopping is applied based on the gap configuration information.
- the gap configuration information is stored in a memory or the like, the gap period (subframe) is calculated according to the gap configuration information, and the gap period (which subframe corresponds to the gap).
- the signal transmission unit 101 and / or the signal reception unit 102 can perform an operation of transmitting / receiving a different frequency D2D signal without transmitting / receiving a cellular signal in the period of the measurement gap.
- the measurement gap control unit 105 An operation of releasing the gap can also be performed.
- the measurement gap control unit 105 can instruct the signal transmission unit 101 to execute transmission of the upstream cellular signal with priority over transmission and reception of the D2D signal in the measurement gap. Moreover, the measurement gap control part 105 can also perform control which does not transmit a specific cellular signal among uplink cellular signals in a measurement gap.
- the measurement gap control unit 105 transmits the gap setting request including the D2D resource configuration information to the base station of the serving cell described as the combination example in the modification, and the gap configuration information is transmitted as a response to the gap setting request. Based on the gap configuration information received from the base station, a gap can be set in consideration of D2D resource configuration information and time hopping.
- the DRX control unit 106 executes the processing related to the DRX transition request, change, setting, release, etc. described so far.
- FIG. 20 shows a functional configuration diagram of the base station eNB according to the present embodiment.
- the base station eNB includes a signal transmission unit 201, a signal reception unit 202, a UE information storage unit 203, a D2D resource information storage unit 204, a measurement gap control unit 205, and a DRX control unit 206.
- FIG. 20 shows only the functional units particularly related to the embodiment of the present invention in the base station eNB, and also has a function (not shown) for operating as a base station in a mobile communication system compliant with LTE. Is.
- the functional configuration illustrated in FIG. 20 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 function unit may be anything.
- the signal transmission unit 201 includes a function of generating various physical layer signals from a higher layer signal to be transmitted from the base station eNB and wirelessly transmitting the signals.
- the signal receiving unit 202 includes a function of wirelessly receiving various signals from the user apparatus UE and acquiring a higher layer signal from the received physical layer signal.
- the UE information storage unit 203 stores information received from each user apparatus UE as the UE capability, and the measurement gap control unit 205 / DRX control unit 206 refers to this information to measure the user apparatus UE. Whether or not the gap / DRX can be set can be determined.
- the D2D resource information storage unit 204 stores, for example, D2D resource information (which may be processed into measurement gap setting information) received from each user apparatus UE, and the measurement gap control unit 205 / DRX control unit 206 can refer to this information to set the measurement gap / DRX even for the user apparatus UE that does not transmit the request specifying the parameter.
- D2D resource information which may be processed into measurement gap setting information
- the measurement gap control unit 205 executes processing related to setting, changing, response to request, changing release, etc. of the measurement gap described so far.
- the measurement gap control unit 205 sets a time hopping pattern, transmits the set time hopping pattern information to the user apparatus UE via the signal transmission unit 201, and the gap configuration information including the time hopping pattern.
- a function of transmitting to the device UE via the signal transmission unit 201 is also included.
- the DRX control unit 206 executes processing related to transition control to DRX and the like described so far.
- a user apparatus used in a mobile communication system that supports D2D communication, and transmits a measurement gap setting request for monitoring a different frequency D2D signal to a base station of a connected or serving cell.
- a user apparatus comprising: a measurement gap control unit that performs monitoring; and a D2D communication unit that monitors the different frequency D2D signal using the measurement gap set based on the setting request.
- the user apparatus can efficiently perform different frequency D2D signal monitoring without hindering cellular communication and transmission / reception of the same frequency D2D signal as much as possible.
- the different frequency D2D signal is a D2D signal transmitted at a frequency different from the frequency used for the D2D signal transmission by the user apparatus.
- the measurement gap control means creates measurement gap setting information based on D2D resource configuration information received from a base station different from the base station of the connection or serving cell, and sends the setting request including the setting information to the setting request. You may make it transmit to the base station of a connection or a serving cell.
- the measurement gap can be set according to the D2D resource configuration.
- the measurement gap control means may transmit the setting request including D2D resource configuration information received from a base station different from the base station of the connection or serving cell to the base station of the connection or serving cell.
- the base station since the base station can hold the different frequency D2D resource configuration information, for example, the measurement gap can be set in an arbitrary user apparatus using the configuration information.
- the measurement gap is set to include, for example, a resource pool for transmitting the different frequency D2D signal.
- “including” does not intend that the measurement gap is wider than the time width of the resource pool. With this configuration, the measurement gap can be set more efficiently.
- the measurement gap control means may transmit a change request for changing the setting of the measurement gap or a release request for releasing the measurement gap to the base station of the connection or serving cell. For example, it is possible to follow a change in the different frequency D2D resource configuration by a change request, and avoid setting a useless measurement gap by a release request.
- the user apparatus includes a DRX control unit that transmits a DRX setting request for causing the user apparatus to transition to the DRX state to the base station of the connected or serving cell, and performs transition to the DRX state
- the D2D communication means may monitor the different frequency D2D signal in an inactive period in the DRX state. With this configuration, it is possible to monitor the different frequency D2D signal with a time width wider than the measurement gap.
- the measurement gap control means indicates capability information indicating that the user device has a monitoring capability of a different frequency D2D signal, or information indicating that the user device desires to monitor the different frequency D2D signal. May be transmitted to the base station of the connected or in-zone cell. With this configuration, for example, the base station can determine whether or not the measurement gap can be set for the user apparatus.
- the measurement gap is, for example, a predetermined subframe in a gap block having a predetermined time length
- the D2D communication unit is configured to transmit a cellular signal in the connected or serving cell in a subframe other than the measurement gap in the gap block.
- the measurement gap in the gap block can be released.
- the D2D communication means may perform transmission of an upstream cellular signal in the connection or serving cell with priority over transmission / reception of the D2D signal. With this configuration, it is possible to monitor different frequency D2D signals without degrading the performance of cellular communication.
- the D2D communication means may not transmit a specific cellular signal among uplink cellular signals in the connected or serving cell in the measurement gap. For example, by selecting a signal that hardly affects the performance of cellular communication as a specific cellular signal, it is possible to efficiently monitor the different frequency D2D signal without degrading the performance of cellular communication.
- the measurement gap may be a time interval of a predetermined time length that is sequentially assigned based on a time hopping pattern in the time domain.
- a time hopping pattern in the time domain.
- a base station used in the mobile communication system which supports D2D communication, Comprising: The receiving means which receives the setting request
- the user apparatus can efficiently perform different frequency D2D signal monitoring without hindering cellular communication and transmission / reception of the same frequency D2D signal as much as possible.
- the measurement gap control means may set the measurement gap for another user device different from the user device based on the measurement gap setting information.
- an appropriate measurement gap can be set for a user apparatus that does not grasp the different frequency D2D resource configuration information.
- the different frequency D2D signal monitoring method performed by the user apparatus and base station which are used in the mobile communication system which supports D2D communication, Comprising:
- the said user apparatus monitors a different frequency D2D signal.
- a different frequency D2D signal monitoring method comprising the step of monitoring the different frequency D2D signal.
- the user apparatus UE described in the present embodiment may have a configuration realized by executing a program by a CPU (processor) in the user apparatus UE including a CPU and a memory.
- the configuration may be realized by hardware such as a hardware circuit having processing logic to be described, or a program and hardware may be mixed.
- the base station eNB described in the present embodiment may have a configuration realized by a program being executed by a CPU (processor) in a base station eNB including a CPU and a memory.
- the configuration may be realized by hardware such as a hardware circuit having processing logic to be described, or a program and hardware may be mixed.
- the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
- the base station has been described using a functional block diagram, but such a device may be implemented in hardware, software, or a combination thereof.
- the software operating by the processor of the user apparatus and the base station is random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), respectively. , A removable disk, a CD-ROM, a database, a server, or any other suitable storage medium.
- eNB base station UE user apparatus 101 signal transmission unit 102 signal reception unit 103 D2D communication function unit 104 D2D resource information acquisition unit 105 measurement gap control unit 106 DRX control unit 201 signal transmission unit 202 signal reception unit 203 UE information storage unit 204 D2D resource Information storage unit 205 Measurement gap control unit 206 DRX control unit
Abstract
Description
異周波D2D信号をモニタするための測定ギャップの設定要求を、接続又は在圏セルの基地局に送信する測定ギャップ制御手段と、
前記設定要求に基づき設定される前記測定ギャップを用いて前記異周波D2D信号をモニタするD2D通信手段とを備えるユーザ装置が提供される。
ユーザ装置から、当該ユーザ装置によりD2D信号送信に使用される周波数と異なる周波数で送信される異周波D2D信号をモニタするための測定ギャップの設定要求を受信する受信手段と、
前記設定要求に含まれる測定ギャップの設定情報に基づいて、当該測定ギャップを前記ユーザ装置に対して設定する測定ギャップ制御手段とを備える基地局が提供される。
前記ユーザ装置が、異周波D2D信号をモニタするための測定ギャップの設定要求を、前記基地局に送信するステップと、
前記基地局が、前記設定要求に対する応答を前記ユーザ装置に送信するステップと、
前記ユーザ装置が、前記測定ギャップを用いて前記異周波D2D信号をモニタするステップとを備える異周波D2D信号モニタリング方法が提供される。
図2は、本発明の実施の形態における通信システムの構成例を示す。図2に示すように、本実施の形態における通信システムには、事業者Aの基地局eNB(A)とその配下のユーザ装置UE(A)、及び、事業者Bの基地局eNB(B)とその配下のユーザ装置UE(B)が存在する。事業者A、B間でD2D通信に使用するキャリアは異なる。
図3を参照して、本実施の形態におけるユーザ装置UEと基地局eNBにおける基本的な動作例を説明する。図3において、ユーザ装置UEは、基地局eNBのセルに接続又は在圏している。
次に、本実施の形態においてユーザ装置UE及び基地局eNBに設定される測定ギャップの例を説明する。
図3を参照して説明したギャップ設定要求、ギャップ変更要求、ギャップ解放要求の送信には、RRCやMAC等の上位レイヤシグナリング信号を使用してもよいし、PUCCHを使用してもよい。また、基地局eNBからユーザ装置UEへの応答や設定には、RRCやMAC等の上位レイヤシグナリング信号を使用してもよいし、(E)PDCCHを使用してもよい。
本実施の形態においては、測定ギャップの設定に加えて(又はこれに代えて)、DRX(間欠受信)状態への遷移を行ってもよい。例えば、図7に示すように、まず、ユーザ装置UEが基地局eNBにDRX設定要求を送信する(ステップS301)。このDRX設定要求には、例えば、DRXへの遷移タイミング(SFN、サブフレーム番号等)、DRXの構成情報(周期、アクティブ期間の時間長等)が含まれていてよい。このDRX設定要求を受信した基地局eNBは、当該DRXの情報を当該ユーザ装置UEに対するDRX設定情報として保持し、当該設定情報に従ってユーザ装置UEと同期してDRXを行う(非アクティブ期間はスケジューリングしない等)。また、ステップS302において、基地局eNBからユーザ装置UEにDRX設定応答が返される。ユーザ装置UEは、この応答をトリガにして、要求したDRXへの遷移等を行う。
本実施の形態においては、ユーザ装置UEは基地局eNBに対して異周波D2D信号モニタリングをサポートしているか否かを示すUE capability(能力)を上位レイヤシグナリングにより通知することとしてよい。
本実施の形態において図4等を参照して説明したような周期的に到来する測定ギャップについて、1つ1つの測定ギャップは、連続したサブフレームであってもよいし、不連続なサブフレームであってもよい。このように測定ギャップにおいては種々のサブフレームのパターンをとることができる。
<D2D信号の送受信>
これまでは、ユーザ装置UEが、測定ギャップにおいて異周波D2D信号の受信を行うことを主に説明したが、ユーザ装置UEは、測定ギャップにおいて異周波D2D信号の送信を行うこととしてもよい。
本実施の形態では、測定ギャップにおいて異周波D2D信号のモニタリング(すなわち受信)を行うことから、測定ギャップにおいてはサービングセルのDL信号受信を不可としている。測定ギャップにおけるサービングセルのUL信号送信については、DL信号受信と同様に不可としてもよいし、UL信号送信を許容してもよい。
これまでに説明した例では、基本的に、ユーザ装置UE及び基地局eNBは、異周波D2D信号モニタリングのために、他事業者のD2Dリソース構成情報に基づいて測定ギャップを設定している。
変形例では、測定ギャップに時間ホッピングを適用して、他事業者のD2Dリソース構成を把握できない場合でも、ユーザ装置UEができるだけ異周波D2D信号を受信できる確率を増加させることとしている。時間ホッピングパターンの具体例については後述する。
図13に、測定ギャップに対して時間ホッピングを適用する場合のイメージを示す。図13の例では、PLMN-A(事業者A)におけるユーザ装置UE(及び基地局eNB)に対し、時間ホッピングが適用された測定ギャップが順次到来していることが示されている(図中の網掛けをしたサブフレーム)。
変形例における測定ギャップの設定シグナリングの例を図14に示す。図14に示すように、基地局eNBがユーザ装置UEに対して、ギャップ構成情報(ギャップコンフィギュレーション)を送信する(ステップS501)。ユーザ装置UEは、基地局eNBから当該ギャップ構成情報を受信し、当該ギャップ構成情報を適用する(ステップS502)。
図15に、時間ホッピングを適用した測定ギャップの構成例として時間ホッピングパターン例1を示す。本例において、基地局eNBからユーザ装置UEに通知されるギャップ構成情報には、例えば、測定ギャップの期間(period)を示すギャップ周期、ギャップ周期間の間隔を示すギャップ間隔、及び時間ホッピングパターンが含まれる。更に、最初のギャップ周期が開始される時間位置を示すオフセット値、及び/又は、ギャップ周期内での時間ホッピングを行う単位時間長であるギャップサイズが含まれていてもよい。1ギャップサイズの時間長を便宜上「スロット」と呼んでもよい。
図16に、時間ホッピングを適用した測定ギャップの構成例として時間ホッピングパターン例2を示す。本例において、基地局eNBからユーザ装置UEに通知されるギャップ構成情報には、例えば、ギャップブロックの情報、ギャップブロック間の間隔を示すギャップ間隔、最初のギャップブロックの開始時間位置を示すギャップオフセットが含まれる。
本例における基本的な動作手順は、図3に示したとおりの手順である。すなわち、まず、ユーザ装置UEは、他事業者の基地局eNBから他事業者の報知情報を受信することで、他事業者のD2D通信のリソース構成を把握しているものとする。
図17は、D2Dリソースの構成例を示す図である。これは、時間方向の構成に着目した図である。図17に示す例において、D2Dリソースはサブフレームビットマップとして表される。また、ビットマップは、num.reprtitionの回数だけ繰り返される。また、各周期(period)における開始位置を示すoffsetが指定される。
以下、本発明の実施の形態の動作(少なくとも、これまでに説明した全ての動作)を実行するユーザ装置UEと基地局eNBの構成例を説明する。
図19に、本実施の形態に係るユーザ装置UEの機能構成図を示す。図19に示すように、ユーザ装置UEは、信号送信部101、信号受信部102、D2D通信機能部103、D2Dリソース情報取得部104、測定ギャップ制御部105、DRX制御部106を含む。なお、図19は、ユーザ装置UEにおいて本発明の実施の形態に特に関連する機能部のみを示すものであり、少なくともLTEに準拠した動作を行うための図示しない機能も有するものである。また、図19に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分や機能部の名称はどのようなものでもよい。
図20に、本実施の形態に係る基地局eNBの機能構成図を示す。図20に示すように、基地局eNBは、信号送信部201、信号受信部202、UE情報格納部203、D2Dリソース情報格納部204、測定ギャップ制御部205、DRX制御部206を含む。なお、図20は、基地局eNBにおいて本発明の実施の形態に特に関連する機能部のみを示すものであり、少なくともLTEに準拠した移動通信システムにおける基地局として動作するための図示しない機能も有するものである。また、図20に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分や機能部の名称はどのようなものでもよい。
本実施の形態において、D2D通信をサポートする移動通信システムにおいて使用されるユーザ装置であって、異周波D2D信号をモニタするための測定ギャップの設定要求を、接続又は在圏セルの基地局に送信する測定ギャップ制御手段と、前記設定要求に基づき設定される前記測定ギャップを用いて前記異周波D2D信号をモニタするD2D通信手段とを備えるユーザ装置が提供される。この構成により、セルラー通信及び同周波のD2D信号送受信をできるだけ阻害せずに、ユーザ装置が異周波D2D信号モニタリングを効率的に行うことが可能となる。なお、異周波D2D信号は、前記ユーザ装置によりD2D信号送信に使用される周波数と異なる周波数で送信されるD2D信号である。
UE ユーザ装置
101 信号送信部
102 信号受信部
103 D2D通信機能部
104 D2Dリソース情報取得部
105 測定ギャップ制御部
106 DRX制御部
201 信号送信部
202 信号受信部
203 UE情報格納部
204 D2Dリソース情報格納部
205 測定ギャップ制御部
206 DRX制御部
Claims (9)
- D2D通信をサポートする移動通信システムにおいて使用されるユーザ装置であって、
異周波D2D信号をモニタするための測定ギャップの設定要求を、接続又は在圏セルの基地局に送信する測定ギャップ制御手段と、
前記設定要求に基づき設定される前記測定ギャップを用いて前記異周波D2D信号をモニタするD2D通信手段と
を備えることを特徴とするユーザ装置。 - 前記測定ギャップ制御手段は、前記接続又は在圏セルの基地局と異なる基地局から受信したD2Dリソース構成情報に基づいて、測定ギャップの設定情報を作成し、当該設定情報を含む前記設定要求を前記接続又は在圏セルの基地局に送信する
ことを特徴とする請求項1に記載のユーザ装置。 - 前記測定ギャップ制御手段は、前記接続又は在圏セルの基地局と異なる基地局から受信したD2Dリソース構成情報を含む前記設定要求を前記接続又は在圏セルの基地局に送信する
ことを特徴とする請求項1又は2に記載のユーザ装置。 - 前記測定ギャップは、前記異周波D2D信号の送信のためのリソースプールを包含するように設定される
ことを特徴とする請求項1ないし3のうちいずれか1項に記載のユーザ装置。 - 前記測定ギャップ制御手段は、前記測定ギャップの設定を変更するための変更要求、又は、前記測定ギャップを解放するための解放要求を前記接続又は在圏セルの基地局に送信する
ことを特徴とする請求項1ないし4のうちいずれか1項に記載のユーザ装置。 - 前記測定ギャップ制御手段は、前記ユーザ装置が異周波D2D信号のモニタ能力を有することを示す能力情報、又は、前記ユーザ装置が異周波D2D信号のモニタを行うことを希望していることを示す情報を前記接続又は在圏セルの基地局に送信する
ことを特徴とする請求項1ないし5のうちいずれか1項に記載のユーザ装置。 - 前記測定ギャップは、所定の時間長を有するギャップブロック内の所定のサブフレームであり、
前記D2D通信手段は、前記ギャップブロックにおける測定ギャップ以外のサブフレームにおいて、前記接続又は在圏セルにおけるセルラー信号の送信又は受信が発生した場合に、当該ギャップブロック内の測定ギャップを解除する
請求項1ないし6のうちいずれか1項に記載のユーザ装置。 - D2D通信をサポートする移動通信システムにおいて使用される基地局であって、
ユーザ装置から、異周波D2D信号をモニタするための測定ギャップの設定要求を受信する受信手段と、
前記設定要求に含まれる測定ギャップの設定情報に基づいて、当該測定ギャップを前記ユーザ装置に対して設定する測定ギャップ制御手段と
を備えることを特徴とする基地局。 - D2D通信をサポートする移動通信システムにおいて使用されるユーザ装置と基地局により実行される異周波D2D信号モニタリング方法であって、
前記ユーザ装置が、異周波D2D信号をモニタするための測定ギャップの設定要求を、前記基地局に送信するステップと、
前記基地局が、前記設定要求に対する応答を前記ユーザ装置に送信するステップと、
前記ユーザ装置が、前記測定ギャップを用いて前記異周波D2D信号をモニタするステップと
を備えることを特徴とする異周波D2D信号モニタリング方法。
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JP2019502292A (ja) * | 2015-11-02 | 2019-01-24 | テレフオンアクチーボラゲット エルエム エリクソン(パブル) | 非サービングキャリア周波数上でのd2d動作の適応化 |
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CN109155906A (zh) * | 2016-05-12 | 2019-01-04 | 株式会社Ntt都科摩 | 用户装置以及信号发送方法 |
US10728881B2 (en) | 2016-05-12 | 2020-07-28 | Ntt Docomo, Inc. | User equipment and signal transmission method |
JP2018026625A (ja) * | 2016-08-08 | 2018-02-15 | ソニー株式会社 | 通信装置及び通信方法 |
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JP6316435B2 (ja) | 2018-04-25 |
JPWO2016021653A1 (ja) | 2017-05-25 |
EP3179798A4 (en) | 2017-08-02 |
US11381954B2 (en) | 2022-07-05 |
CN106576332A (zh) | 2017-04-19 |
ES2776397T3 (es) | 2020-07-30 |
EP3179798A1 (en) | 2017-06-14 |
US20170230815A1 (en) | 2017-08-10 |
CN106576332B (zh) | 2020-11-17 |
EP3179798B1 (en) | 2020-02-12 |
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