JP6082671B2 - Communication control device and user terminal - Google Patents

Description

  The present invention relates to a communication control device and a user terminal used in a mobile communication system.

  In 3GPP (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, introduction of device-to-device (D2D) communication is being studied (see Non-Patent Document 1). D2D communication is a method in which a plurality of adjacent user terminals perform direct inter-terminal communication without going through a network.

  Further, in 3GPP, introduction of a dual connection (Dual connectivity) is being studied (see Non-Patent Document 2). Double connection is a method in which a pair of cells and user terminals, which are combinations of cells managed by different base stations, establish a pair of connections.

3GPP Technical Report “TR 22.803 V12.1.0” March 2013 3GPP contribution “RP-122033” December 2012

  In the above-described D2D communication, double connection, and the like, it is assumed that the user terminal transmits a plurality of radio signals to a plurality of radio communication devices at the same time.

  Here, if there is a transmission power difference between a plurality of radio signals, the quality of the radio signal with low power may deteriorate due to the interference of the radio signal with high power, and normal signal transmission may not be possible. There is.

  Accordingly, an object of the present invention is to enable normal signal transmission even when a user terminal transmits a plurality of radio signals simultaneously.

  A communication control device according to a first feature is a mobile communication system having a user terminal that transmits a first radio signal to a first radio communication device and transmits a second radio signal to the second radio communication device. Used. The communication control device includes a control unit that selects at least one of a first radio resource allocated to transmit the first radio signal and a second radio resource allocated to transmit the second radio signal. The transmission power of the first radio signal is different from the transmission power of the second radio signal. The control unit determines at least one of the first radio resource and the second radio resource so as to ensure a certain frequency interval between the first radio resource and the second radio resource. select.

  The user terminal according to the second feature transmits a first radio signal to the first radio communication device and transmits a second radio signal to the second radio communication device. The transmission power of the first radio signal is different from the transmission power of the second radio signal. The user terminal is configured to select at least one of a first radio resource assigned to transmit the first radio signal and a second radio resource assigned to transmit the second radio signal. A transmission unit configured to transmit a parameter for setting a certain frequency interval to be secured between the first radio resource and the second radio resource; The parameter is determined according to the capability of the user terminal.

  According to the present invention, normal signal transmission can be realized even when a user terminal transmits a plurality of radio signals simultaneously.

It is a block diagram of the LTE system which concerns on 1st Embodiment and 2nd Embodiment. It is a block diagram of UE which concerns on 1st Embodiment and 2nd Embodiment. It is a block diagram of eNB which concerns on 1st Embodiment and 2nd Embodiment. It is a protocol stack figure of the radio | wireless interface which concerns on 1st Embodiment and 2nd Embodiment. It is a block diagram of the radio | wireless frame which concerns on 1st Embodiment and 2nd Embodiment. It is a figure for demonstrating the operating environment which concerns on 1st Embodiment and 2nd Embodiment. It is a figure for demonstrating the problem which arises in the operating environment shown in FIG. It is a figure which shows the specific example of allocation of the cellular radio | wireless resource and D2D radio | wireless resource in the case of a single carrier based on 1st Embodiment. It is a figure which shows the specific example of allocation of the cellular radio | wireless resource and D2D radio | wireless resource in the case of a single carrier based on 1st Embodiment. It is an operation | movement sequence diagram which concerns on 1st Embodiment. It is a figure for demonstrating the example 1 of a change of 1st Embodiment. It is a sequence diagram concerning the example 1 of a change of a 1st embodiment. It is a figure for demonstrating the operation pattern 1 in the case of a single carrier based on 2nd Embodiment. It is a figure for demonstrating the operation pattern 2 in the case of a single carrier based on 2nd Embodiment. It is a figure for demonstrating the operation | movement in the case of multicarrier based on 2nd Embodiment. It is an operation | movement sequence diagram which concerns on 2nd Embodiment. It is a figure for demonstrating other Embodiment 1. FIG. It is a figure for demonstrating other Embodiment 2. FIG.

[Outline of Embodiment]
A communication control apparatus according to an embodiment is used in a mobile communication system having a user terminal that transmits a first radio signal to a first radio communication apparatus and transmits a second radio signal to a second radio communication apparatus. It is done. The communication control device includes a control unit that selects at least one of a first radio resource allocated to transmit the first radio signal and a second radio resource allocated to transmit the second radio signal. The transmission power of the first radio signal is different from the transmission power of the second radio signal. The control unit determines at least one of the first radio resource and the second radio resource so as to ensure a certain frequency interval between the first radio resource and the second radio resource. select.

  In one embodiment, the control unit obtains a parameter for setting the certain frequency interval from the user terminal. The parameter is determined according to the capability of the user terminal. The control unit sets the constant frequency interval based on the parameter.

  In one embodiment, the parameter indicates a plurality of frequency intervals that are defined in stages according to the degree to which the leakage power is attenuated. The control unit preferentially sets a wide frequency interval among the plurality of frequency intervals as the constant frequency interval based on the parameter.

  In one embodiment, one carrier used in the mobile communication system includes a pair of radio resource regions provided at least at the fixed frequency interval. The control unit selects a radio resource included in one radio resource area from the pair of radio resource areas as the first radio resource, and selects the radio resource area as the other radio resource area from the pair of radio resource areas. The included radio resource is selected as the second radio resource.

  In one embodiment, one carrier used in the mobile communication system includes a pair of radio resource regions provided at least at the fixed frequency interval. The first radio signal is applied with frequency hopping as the first radio resource, in which radio resources included in the one radio resource area and radio resources included in the other radio resource area are alternately allocated. It is an uplink control signal. The control unit stops application of the frequency hopping, selects a radio resource included in the one radio resource region as the first radio resource, and a radio included in the other radio resource region. A resource is selected as the second radio resource.

  In one embodiment, one carrier used in the mobile communication system includes a pair of radio resource regions provided at least at the fixed frequency interval. The first radio signal is applied with frequency hopping as the first radio resource, in which radio resources included in the one radio resource area and radio resources included in the other radio resource area are alternately allocated. It is an uplink control signal. The control unit determines a radio resource included in a radio resource area opposite to the radio resource area including the first radio resource from the pair of radio resource areas according to the frequency hopping hopping pattern. Select as a radio resource.

  In one embodiment, the second radio signal is a radio signal including user data. The control unit notifies the user terminal of allocation information related to the second radio resource. The allocation information indicates the number of radio resources that constitute the second radio resource in the frequency direction starting from the carrier edge of the carrier.

  In one embodiment, at least the fixed frequency interval is provided between the first carrier and the second carrier used in the mobile communication system. The control unit selects a radio resource included in the first carrier as the first radio resource, and selects a radio resource included in the second carrier as the second radio resource.

  In one embodiment, the first carrier and the second carrier used in the mobile communication system are continuous in the frequency direction. The control unit sets a radio resource included in the first carrier as the first radio resource while ensuring the fixed frequency interval between the first radio resource and the second radio resource. And a radio resource included in the second carrier is selected as the second radio resource.

  In one embodiment, the first radio signal includes, as the first radio resource, a radio resource included in one radio resource area of the pair of radio resource areas in the first carrier and the other radio resource area. This is an uplink control signal to which frequency hopping that alternately allocates radio resources included in is applied. The control unit stops application of the frequency hopping, selects a radio resource included in the first carrier as the first radio resource, and selects a radio resource included in the second carrier. Select as the second radio resource.

  In one embodiment, the control unit transmits information indicating a period during which application of the frequency hopping should be stopped to a plurality of user terminals including the user terminal.

  In one embodiment, the mobile communication system supports D2D communication that is direct end-to-end communication. At least one of the first wireless communication device and the second wireless communication device is a user terminal.

  In one embodiment, the mobile communication system supports a double connection in which a pair of cells, which are combinations of cells managed by different base stations, and the user terminal establish a pair of connections. Both the first wireless communication device and the second wireless communication device are base stations.

  The user terminal which concerns on one Embodiment transmits a 1st radio signal to a 1st radio | wireless communication apparatus, and transmits a 2nd radio signal to a 2nd radio | wireless communication apparatus. The transmission power of the first radio signal is different from the transmission power of the second radio signal. The user terminal is configured to select at least one of a first radio resource assigned to transmit the first radio signal and a second radio resource assigned to transmit the second radio signal. A transmission unit configured to transmit a parameter for setting a certain frequency interval to be secured between the first radio resource and the second radio resource; The parameter is determined according to the capability of the user terminal.

[First Embodiment]
In the following, an embodiment when the present invention is applied to an LTE system will be described.

(System configuration)
FIG. 1 is a configuration diagram of an LTE system according to the first embodiment. As shown in FIG. 1, the LTE system according to the first embodiment includes a UE (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.

  UE100 is corresponded to a user terminal. The UE 100 is a mobile communication device, and performs wireless communication with a connection destination cell (serving cell). The configuration of the UE 100 will be described later.

  The E-UTRAN 10 corresponds to a radio access network. The E-UTRAN 10 includes an eNB 200 (evolved Node-B). The eNB 200 corresponds to a base station. The eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.

  The eNB 200 manages one or a plurality of cells, and performs radio communication with the UE 100 that has established a connection with the own cell. The eNB 200 has a radio resource management (RRM) function, a user data routing function, a measurement control function for mobility control / scheduling, and the like. “Cell” is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.

  The EPC 20 corresponds to a core network. An LTE system network is configured by the E-UTRAN 10 and the EPC 20. The EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300. The MME performs various mobility controls for the UE 100. The S-GW performs user data transfer control. The MME / S-GW 300 is connected to the eNB 200 via the S1 interface.

  FIG. 2 is a block diagram of the UE 100. As illustrated in FIG. 2, the UE 100 includes a plurality of antennas 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160. The memory 150 and the processor 160 constitute a control unit. The UE 100 may not have the GNSS receiver 130. Further, the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 '.

  The plurality of antennas 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals. The radio transceiver 110 converts the baseband signal (transmission signal) output from the processor 160 into a radio signal and transmits it from the plurality of antennas 101. Further, the radio transceiver 110 converts radio signals received by the plurality of antennas 101 into baseband signals (received signals) and outputs the baseband signals to the processor 160.

  The user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons. The user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160. The GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain location information indicating the geographical location of the UE 100. The battery 140 stores power to be supplied to each block of the UE 100.

  The memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160. The processor 160 includes a baseband processor that modulates / demodulates and encodes / decodes a baseband signal, and a CPU (Central Processing Unit) that executes programs stored in the memory 150 and performs various processes. . The processor 160 may further include a codec that performs encoding / decoding of an audio / video signal. The processor 160 executes various processes and various communication protocols described later.

  FIG. 3 is a block diagram of the eNB 200. As illustrated in FIG. 3, the eNB 200 includes a plurality of antennas 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240. The memory 230 and the processor 240 constitute a control unit.

  The plurality of antennas 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals. The radio transceiver 210 converts a baseband signal (transmission signal) output from the processor 240 into a radio signal and transmits the radio signal from the plurality of antennas 201. In addition, the radio transceiver 210 converts radio signals received by the plurality of antennas 201 into baseband signals (reception signals) and outputs the baseband signals to the processor 240.

  The network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface. The network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.

  The memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240. The processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes a program stored in the memory 230 and performs various processes. The processor 240 executes various processes and various communication protocols described later.

  FIG. 4 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 4, the radio interface protocol is divided into the first to third layers of the OSI reference model, and the first layer is a physical (PHY) layer. The second layer includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer. The third layer includes an RRC (Radio Resource Control) layer.

  The physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Between the physical layer of UE100 and the physical layer of eNB200, user data and a control signal are transmitted via a physical channel.

  The MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Between the MAC layer of the UE 100 and the MAC layer of the eNB 200, user data and control signals are transmitted via a transport channel. The MAC layer of the eNB 200 includes uplink / downlink transport formats (transport block size, modulation / coding scheme), resource blocks allocated to the UE 100, and a scheduler for determining (scheduling) transmission power.

  The RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Between the RLC layer of the UE 100 and the RLC layer of the eNB 200, user data and control signals are transmitted via a logical channel.

  The PDCP layer performs header compression / decompression and encryption / decryption.

  The RRC layer is defined only in the control plane that handles control signals. Control signals (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200. The RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer. When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connection state (RRC connection state). Otherwise, the UE 100 is in an idle state (RRC idle state).

  A NAS (Non-Access Stratum) layer located above the RRC layer performs session management, mobility management, and the like.

  FIG. 5 is a configuration diagram of a radio frame used in the LTE system. In the LTE system, OFDMA (Orthogonal Frequency Division Multiplexing Access) is applied to the downlink (DL), and SC-FDMA (Single Carrier Frequency Multiple Access) is applied to the uplink (UL).

  As shown in FIG. 5, the radio frame is composed of 10 subframes arranged in the time direction. Each subframe is composed of two slots arranged in the time direction. The length of each subframe is 1 ms, and the length of each slot is 0.5 ms. Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction. Each resource block includes a plurality of subcarriers in the frequency direction. A resource element is composed of one subcarrier and one symbol.

  Among radio resources allocated to the UE 100, frequency resources are configured by resource blocks, and time resources are configured by subframes (or slots).

  In the downlink, the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) for transmitting a downlink control signal. The remaining part of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH) for transmitting downlink user data.

  In the uplink, both ends in the frequency direction in each subframe are regions used mainly as physical uplink control channels (PUCCH) for transmitting uplink control signals. The remaining part in each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH) for transmitting uplink user data.

(D2D communication)
The LTE system according to the first embodiment supports D2D communication that is direct inter-terminal communication (UE-UE communication). Here, D2D communication will be described in comparison with cellular communication, which is normal communication of the LTE system.

  Cellular communication is a communication mode in which a data path passes through a network (E-UTRAN10, EPC20). A data path is a communication path for user data. On the other hand, D2D communication is a communication mode in which a data path set between UEs does not pass through a network. The plurality of UEs 100 that are close to each other directly perform radio communication with low transmission power in the cell of the eNB 200. As described above, when a plurality of neighboring UEs 100 directly perform radio communication with low transmission power, it is possible to reduce power consumption of the UE 100 and reduce interference with adjacent cells as compared with cellular communication.

(Operation according to the first embodiment)
Next, an operation according to the first embodiment will be described.

(1) Outline of Operation In an LTE system that supports D2D communication, it is assumed that UE 100 simultaneously transmits or receives a plurality of radio signals related to a plurality of radio communication apparatuses. FIG. 6 is a diagram for explaining the operating environment according to the first embodiment. FIG. 7 is a diagram for explaining a problem that occurs in the operating environment according to the first embodiment.

  As shown in FIG. 6, UE 100-1 and UE 100-2 are located in a cell managed by eNB 200 (hereinafter simply referred to as “cell of eNB 200”). UE100-1 performs cellular communication with eNB200 and D2D communication with UE100-2 under control of eNB200.

  UE100-1 transmits radio signal SG1 in cellular communication to eNB200. UE100-1 transmits radio | wireless signal SG2 in D2D communication to UE100-2. UE100-1 transmits radio signal SG1 and radio signal SG2 simultaneously. In other words, the UE 100-1 transmits the radio signal SG1 (first radio signal) to the eNB 200 (first radio communication device) and transmits the radio signal SG2 (second radio signal) to the UE 100-2 (second radio signal). To a wireless communication device). The radio signal SG1 and the radio signal SG2 have different frequencies. The UE 100-2 receives the radio signal SG2, but at that time, the UE 100-2 also receives the radio signal SG1.

  In the operating environment illustrated in FIG. 6, the UE 100-1 is located far from the eNB 200. Moreover, UE100-1 is located in the vicinity of UE100-2 which is a communicating party of D2D communication. Therefore, UE100-1 transmits radio signal SG1 with high transmission power. On the other hand, UE100-1 transmits radio signal SG2 with low transmission power. As a result, the UE 100-2 receives the radio signal SG1 with high received power and receives the radio signal SG2 with low received power.

  As shown in FIG. 7, when the power difference between the radio signal SG1 and the radio signal SG2 is large, the signal-to-noise ratio (SNR) of the radio signal SG2 with low power deteriorates due to the influence of interference by the radio signal SG1 with high power. Normal signal transmission can be difficult. Specifically, in the UE 100-1 on the transmission side, noise due to leakage power of the radio signal SG1 is mixed into the radio signal SG2 due to transmission distortion of the radio signal SG1, and the SNR of the radio signal SG2 deteriorates in the UE 100-2. There is. Alternatively, even in the case where noise is not mixed in the radio signal SG2 in the UE 100-1, the SNR of the radio signal SG2 may be deteriorated in the UE 100-2 due to reception distortion (reception blocking and IM response) due to the radio signal SG1. is there.

  The eNB 200 (communication control device) according to the first embodiment includes a cellular radio resource (first radio resource) allocated to transmission of the radio signal SG1 and a D2D radio resource (second radio resource) allocated to transmission of the radio signal SG2. Select at least one of them. The cellular radio resource includes, for example, a PUCCH resource and a PUSCH resource. The D2D radio resource includes, for example, a physical D2D shared channel (PD2DSCH) resource.

  As described above, the transmission power of the radio signal SG1 and the transmission power of the radio signal SG2 are different. Specifically, the transmission power of the radio signal SG1 is larger than the transmission power of the radio signal SG2.

  The eNB 200 selects at least one of the cellular radio resource and the D2D radio resource so as to ensure a certain frequency interval between the cellular radio resource and the D2D radio resource. Here, the “constant frequency interval” is preferably set to a frequency interval such that the influence of interference of the radio signal SG1 on the radio signal SG2 is sufficiently reduced. A specific example of securing a certain frequency interval will be described later.

  Thus, by ensuring a fixed frequency interval between the cellular radio resource and the D2D radio resource, it is possible to suppress noise due to leakage power of the radio signal SG1 from being mixed into the radio signal SG2. Moreover, in UE100-2, it can suppress that SNR of radio signal SG2 deteriorates by the reception distortion (reception blocking and IM response) by radio signal SG1. Therefore, normal signal transmission can be realized even when the UE 100-1 transmits a plurality of radio signals simultaneously.

(2) Specific operation example Next, regarding the specific operation example according to the first embodiment, (2.1) operation in the case of a single carrier, (2.2) operation in the case of a multicarrier, and (2.3) operation. The sequence will be described in this order.

(2.1) Operation in the case of a single carrier First, the operation in the case of one carrier (frequency band) operated by the eNB 200, that is, the operation in the case of a single carrier will be described.

(2.1.1) Operation pattern 1
In the operation pattern 1 in the case of a single carrier, the eNB 200 arranges the cellular radio resource and the D2D radio resource at a position separated as much as possible in the frequency direction within one carrier.

  Specifically, one carrier includes a pair of radio resource areas provided with at least a fixed frequency interval. The eNB 200 selects a radio resource included in one radio resource area as a cellular radio resource from the pair of radio resource areas, and selects a radio resource included in the other radio resource area from the pair of radio resource areas as a D2D radio Select as a resource. Thereby, a fixed frequency interval can be ensured between the cellular radio resource allocated to the UE 100-1 and the D2D radio resource. Note that one radio resource region is an end region from one carrier end to a predetermined range in the frequency direction. The other radio resource region is an end region from the other carrier end to a predetermined range in the frequency direction.

  Alternatively, the eNB 200 sequentially searches for a free radio resource from one carrier end in the frequency direction, selects the detected free radio resource as a cellular radio resource, and sequentially selects a free radio resource from the other carrier end in the frequency direction. It may search and select the detected empty radio | wireless resource as a D2D radio | wireless resource.

(2.1.2) Operation pattern 2
In the operation pattern 2 in the case of a single carrier, the UE 100-1 transmits a parameter for setting a constant frequency interval Δf to the eNB 200. The parameter is determined according to the capability of the UE 100-1 (for example, the performance of the radio transceiver 110). The parameter may be information indicating the capability of the UE 100-1, or may be information indicating the frequency interval Δf according to the capability of the UE 100-1 (for example, the number of resource blocks). UE100-1 transmits a parameter to eNB200 according to the request | requirement from eNB200. Or UE100-1 may transmit a parameter to eNB200, even if there is no request from eNB200.

  eNB200 acquires the parameter for setting fixed frequency interval (DELTA) f from UE100-1, and sets fixed frequency interval (DELTA) f based on the acquired parameter. For example, when the capability of the UE 100-1 is low, the eNB 200 sets the constant frequency interval Δf to be large.

  Or eNB200 may acquire the parameter for setting fixed frequency interval (DELTA) f from a core network (EPC20), and may set fixed frequency interval (DELTA) f based on the acquired parameter.

  FIG. 8 is a diagram illustrating a specific example of allocation of cellular radio resources and D2D radio resources in the case of a single carrier.

  As illustrated in FIG. 8, the eNB 200 allocates radio resources located at one carrier end in the frequency direction as cellular radio resources (PUCCH resources) as allocation in the period T1. Also, the eNB 200 assigns the radio resource located at the other carrier end in the frequency direction as the PD2DSCH resource as the assignment in the period T1. A certain frequency interval Δf is secured between the cellular radio resource and the D2D radio resource.

  As the allocation in the period T2, the eNB 200 allocates radio resources located at one carrier end in the frequency direction as cellular radio resources (PUCCH resources and PUSCH resources). Also, the eNB 200 allocates the radio resource located at the other carrier end in the frequency direction as the PD2DSCH resource as the allocation in the period T2. A certain frequency interval Δf is secured between the cellular radio resource and the D2D radio resource.

(2.2) Operation in the case of multicarrier Secondly, the operation in the case where there are a plurality of carriers (frequency bands) operated by the eNB 200, that is, the operation in the case of multicarrier will be described.

(2.2.1) Operation pattern 1
In operation pattern 1 in the case of multi-carrier, at least a constant frequency interval is provided between the first carrier and the second carrier.

  eNB200 selects the radio | wireless resource contained in a 1st carrier as a cellular radio | wireless resource, and selects the radio | wireless resource contained in a 2nd carrier as a D2D radio | wireless resource. Thus, eNB200 selects the radio | wireless resource contained in the carrier different from the carrier containing a cellular radio | wireless resource as a D2D radio | wireless resource. Thereby, a fixed frequency interval can be ensured between the cellular radio resource allocated to the UE 100-1 and the D2D radio resource. For example, when the UE 100-1 performs communication by carrier aggregation, the eNB 200 selects a radio resource included in the primary component carrier (PCC) as a cellular radio resource, and selects a radio resource included in the secondary component carrier (SCC) as D2D. It may be selected as a radio resource.

  Furthermore, when operating three or more carriers, the eNB 200 selects two carriers (first carrier and second carrier) having the largest frequency interval between the carriers from the three or more carriers. In the above, the radio resource included in the first carrier may be selected as the cellular radio resource, and the radio resource included in the second carrier may be selected as the D2D radio resource.

(2.2.2) Operation pattern 2
In operation pattern 2 in the case of multicarrier, the first carrier and the second carrier are continuous in the frequency direction. The eNB 200 selects the radio resource included in the first carrier as the cellular radio resource while securing a certain frequency interval between the cellular radio resource and the D2D radio resource, and the radio included in the second carrier Select a resource as a D2D radio resource. Here, eNB200 may set a fixed frequency interval based on the parameter acquired from UE100-1 or the core network (EPC20).

  FIG. 9 is a diagram illustrating a specific example of allocation of cellular radio resources and D2D radio resources in the case of multicarrier.

  As illustrated in FIG. 9, the eNB 200 allocates the radio resource located at the carrier end of the first carrier CC1 as the cellular radio resource (PUCCH resource) as the allocation in the period T1. Also, the eNB 200 allocates radio resources located at the carrier edge of the second carrier CC2 as PD2DSCH resources as allocation in the period T1. A certain frequency interval Δf is secured between the cellular radio resource and the D2D radio resource.

  The eNB 200 allocates radio resources located at the carrier end of the first carrier CC1 as cellular radio resources (PUCCH resources and PUSCH resources) as allocation in the period T2. Moreover, eNB200 has allocated the radio | wireless resource located in the carrier edge part of 2nd carrier CC2 as PD2DSCH resource as allocation in the period T2. A certain frequency interval Δf is secured between the cellular radio resource and the D2D radio resource.

(2.3) Operation Sequence FIG. 10 is an operation sequence diagram according to the first embodiment. Here, an operation sequence in the above-described operation pattern 2 will be described.

  As illustrated in FIG. 10, in step S101, the UE 100-1 establishes an RRC connection with the eNB 200.

  In step S102, the UE 100-1 transmits a parameter for setting a certain frequency interval Δf to the eNB 200. The parameter is determined according to the capability of the UE 100-1 (for example, the performance of the radio transceiver 110).

  In step S103, the EPC 20 transmits a parameter for setting the constant frequency interval Δf to the eNB 200. In addition, any one of step S102 and step S103 may be omitted, and in that case, step S104 described later can also be omitted.

  In step S104, the eNB 200 selects the parameter with the larger corresponding frequency interval Δf from the parameters acquired from the UE 100-1 and the EPC 20, and stores the selected frequency interval Δf.

  In step S105, the UE 100-1 transmits an allocation request (Scheduling Request) for requesting allocation of cellular radio resources and D2D radio resources to the eNB 200.

  In step S106, the eNB 200 selects (that is, schedules) a cellular radio resource and a D2D radio resource.

  In step S107, the eNB 200 confirms whether the frequency interval between the cellular radio resource (PUCCH resource or PUSCH resource) and the PD2DSCH resource is larger than the frequency interval Δf stored in step S104. If “NO” in the step S107, the eNB 200 selects (that is, reschedules) the cellular radio resource and the D2D radio resource again in the step S106.

  If “YES” in step S107, in step S108, the eNB 200 transmits allocation information (Resource Allocation) indicating the selected cellular radio resource and D2D radio resource to the UE 100-1 (and UE 100-2).

  In step S109, the UE 100-1 that has received the allocation information transmits the radio signal SG1 to the eNB 200 using the cellular radio resource indicated by the allocation information, and uses the D2D radio resource indicated by the allocation information to transmit the radio signal SG2. It transmits to UE100-2.

(Summary of the first embodiment)
As described above, the eNB 200 selects at least one of the cellular radio resource and the D2D radio resource so as to ensure a certain frequency interval between the cellular radio resource and the D2D radio resource. Thereby, it can suppress that the noise by the leakage power of radio signal SG1 mixes in radio signal SG2. Moreover, in UE100-2, it can suppress that SNR of radio signal SG2 deteriorates by the reception distortion (reception blocking and IM response) by radio signal SG1. Therefore, normal signal transmission can be realized even when the UE 100-1 transmits a plurality of radio signals simultaneously.

  In the first embodiment, the UE 100-1 transmits a parameter for setting the constant frequency interval Δf to the eNB 200. The parameter is determined according to the capability of the UE 100-1 (for example, the performance of the radio transceiver 110). Thereby, eNB200 can set optimal frequency space | interval (DELTA) f with respect to UE100-1.

[First Modification of First Embodiment]
In the operation pattern 2 according to the first embodiment described above, the fixed frequency interval Δf is only one type. However, the fixed frequency interval Δf may be defined stepwise. FIG. 11 is a diagram for explaining a first modification of the first embodiment.

As illustrated in FIG. 11, in the first modification of the first embodiment, the parameters that the eNB 200 acquires from the UE 100-1 or the EPC 20 are specified in stages according to the degree (ΔR) in which the leakage power of the radio signal SG1 is attenuated. A plurality of frequency intervals (Δf ₁ , Δf ₂ ) are shown. The frequency-signal power distribution as shown in FIG. 11 is called a spectrum mask.

The eNB 200 preferentially sets a wide frequency interval among the plurality of frequency intervals (Δf ₁ , Δf ₂ ) as a constant frequency interval Δf based on a parameter (that is, a spectrum mask). For example, the eNB 200 attempts the scheduling using the maximum value (the largest frequency interval Δf), and when the scheduling is impossible, the eNB 200 tries the scheduling using the second largest Δf. Or eNB200 may adjust the modulation and coding system (MCS) applied to transmission of radio signal SG2 according to the amount of interference estimated from a spectrum mask.

  FIG. 12 is a sequence diagram according to the first modification of the first embodiment.

  As illustrated in FIG. 12, in step S201, the UE 100-2 transmits channel state information (CSI) indicating a channel state between the UE 100-1 and the UE 100-2 to the eNB 200. The eNB 200 uses CSI in step S208 described later.

  In step S202, the UE 100-1 establishes an RRC connection with the eNB 200.

  In step S203, UE100-1 transmits the parameter (spectrum mask) for setting fixed frequency interval (DELTA) f to eNB200. The parameter is determined according to the capability of the UE 100-1 (for example, the performance of the radio transceiver 110).

  In step S204, the EPC 20 transmits a parameter (spectrum mask) for setting the constant frequency interval Δf to the eNB 200. Note that either step S203 or step S204 may be omitted.

  In step S205, the UE 100-1 transmits an allocation request (Scheduling Request) for requesting allocation of cellular radio resources and D2D radio resources to the eNB 200.

  In step S206, the eNB 200 selects (that is, schedules) a cellular radio resource and a D2D radio resource.

  In step S207, the eNB 200 confirms whether the frequency interval between the cellular radio resource (PUCCH resource or PUSCH resource) and the PD2DSCH resource is larger than the maximum frequency interval Δf. If “YES” in the step S207, the eNB 200 advances the process to the step S209.

  If “NO” in the step S207, the eNB 200 selects a cellular radio resource and a D2D radio resource in which the second largest frequency interval Δf is secured in the step S208. Moreover, eNB200 estimates the interference amount which radio signal SG2 receives from radio signal SG1 based on a spectrum mask. And eNB200 selects MCS applied to transmission of radio signal SG2 based on the amount of interference and CSI.

  In step S209, the eNB 200 transmits allocation information (Resource Allocation) indicating the selected cellular radio resource, D2D radio resource, and MCS to the UE 100-1 (and UE 100-2).

  In step S210, the UE 100-1 that has received the allocation information transmits the radio signal SG1 to the eNB 200 using the cellular radio resource indicated by the allocation information, and also uses the D2D radio resource and the MCS indicated by the allocation information. SG2 is transmitted to UE100-2.

[Modification 2 of the first embodiment]
In 1st Embodiment mentioned above, eNB200 (communication control apparatus) performed allocation of the cellular radio | wireless resource and D2D radio | wireless resource with respect to UE100-1.

  However, the eNB 200 may allocate cellular radio resources to the UE 100-1, and the UE 100-2 (other communication control device) may allocate D2D radio resources to the UE 100-1. In this case, a certain frequency interval is secured between the cellular radio resource and the D2D radio resource by sharing the resource allocation information between the eNB 200 (communication control apparatus) and the UE 100-2 (other communication control apparatus). Thus, the allocation of cellular radio resources and D2D radio resources can be performed in a coordinated manner.

  For example, the UE 100-2 transmits resource information regarding the D2D radio resource selected by itself to the eNB 200. eNB200 selects a cellular radio | wireless resource so that a fixed frequency interval may be ensured between the cellular radio | wireless resource selected by itself and the D2D radio | wireless resource selected by UE100-2.

  Or eNB200 transmits the resource information regarding the cellular radio | wireless resource selected by itself to UE100-2. UE100-2 selects a D2D radio | wireless resource so that a fixed frequency interval may be ensured between the D2D radio | wireless resource selected by itself and the cellular radio | wireless resource selected by eNB200.

Resource information transmitted and received between the UE 100-2 and the eNB 200 includes at least one of the following information elements.
Resource block number (radio resource allocated by itself or a range of radio resources that the partner may allocate)
・ Carrier number (carrier allocated by itself or range of carriers that other party may allocate)
・ Subframe number (or start / end range)
-Identifier of the corresponding UE [Second Embodiment]
The second embodiment will be described mainly with respect to differences from the first embodiment. In the second embodiment, the system configuration and the operating environment are the same as those in the first embodiment.

(Operation according to the second embodiment)
(1) Outline of Operation In the first embodiment described above, PUCCH frequency hopping (hereinafter referred to as “PUCCH hopping”) is not particularly considered, but in the second embodiment, an operation considering PUCCH hopping is performed.

  One carrier includes a pair of radio resource regions (PUCCH regions) provided with at least a fixed frequency interval. In the second embodiment, the radio signal SG1 is applied with frequency hopping in which radio resources included in one radio resource region and radio resources included in the other radio resource region are alternately allocated as cellular radio resources (PUCCH resources). Is an uplink control signal. PUCCH hopping is performed on a slot basis. By such PUCCH hopping, the effect of frequency diversity is obtained.

  In the second embodiment, the eNB 200 allocates D2D radio resources after stopping PUCCH hopping. This facilitates securing a certain frequency interval between the cellular radio resource (PUCCH resource) and the PD2DSCH resource.

  Or eNB200 performs D2D radio | wireless resource allocation according to PUCCH hopping, without stopping PUCCH hopping. Thereby, it is possible to obtain the frequency diversity effect and to transmit the uplink control signal satisfactorily.

(2) Specific operation example Next, with respect to the specific operation example according to the second embodiment, (2.1) operation in the case of a single carrier, (2.2) operation in the case of a multicarrier, and (2.3) operation. The sequence will be described in this order.

(2.1) Operation in the case of a single carrier First, the operation in the case of one carrier (frequency band) operated by the eNB 200, that is, the operation in the case of a single carrier will be described.

(2.1.1) Operation pattern 1
FIG. 13 is a diagram for explaining an operation pattern 1 in the case of a single carrier.

  As illustrated in FIG. 13, the eNB 200 stops applying PUCCH hopping, selects a radio resource included in one PUCCH region as a cellular radio resource, and selects a radio resource included in the other PUCCH region as D2D. Select as a radio resource.

  Specifically, the eNB 200 allocates radio resources included in one PUCCH region as PUCCH resources as allocation in the period (slot) T1. Further, the eNB 200 allocates a radio resource located at a carrier end opposite to the one PUCCH region as a PD2DSCH resource as allocation in the period (slot) T1.

  Similarly, the eNB 200 allocates radio resources included in the one PUCCH region as PUCCH resources in the period (slot) T2 as in the period (slot) T1. Further, the eNB 200 assigns a radio resource located at a carrier end opposite to the one PUCCH region as a PD2DSCH resource as an assignment in the period (slot) T2.

  eNB200 notifies the allocation information regarding D2D radio resources to UE100-1 by PDCCH, for example. In the second embodiment, the allocation information related to the D2D radio resource is the number of consecutive radio resources (resource blocks) constituting the D2D radio resource in the frequency direction starting from the carrier end to which the PUCCH is not allocated (that is, Resource block count). By such a notification method, the amount of information can be reduced as compared with the case of notifying each resource block constituting the D2D radio resource.

(2.1.2) Operation pattern 2
FIG. 14 is a diagram for explaining an operation pattern 2 in the case of a single carrier.

  As illustrated in FIG. 14, the eNB 200 selects, as a D2D radio resource, a radio resource located at the carrier end opposite to the PUCCH region including the PUCCH resource to be allocated to the UE 100-1 according to the hopping pattern of PUCCH hopping.

  Specifically, the eNB 200 allocates radio resources included in one PUCCH region as PUCCH resources as allocation in the period (slot) T1. Further, the eNB 200 allocates a radio resource located at a carrier end opposite to the one PUCCH region as a PD2DSCH resource as allocation in the period (slot) T1.

  In contrast, the eNB 200 assigns the radio resource included in the other PUCCH region as the PUCCH resource as the assignment in the period (slot) T2. Moreover, eNB200 allocates the radio | wireless resource located in the carrier edge part opposite to the said other PUCCH area | region as PD2DSCH resource as allocation in period (slot) T2.

  eNB200 notifies the allocation information regarding D2D radio resources to UE100-1 by PDCCH, for example. As described above, the allocation information related to the D2D radio resource is the number of radio resources (resource blocks) constituting the D2D radio resource consecutive in the frequency direction starting from the carrier end to which the PUCCH is not allocated (that is, the resource). Number of blocks). However, in the operation pattern 2, the carrier end to which the PUCCH is not assigned is switched for each slot.

(2.2) Operation for Multi-Carrier FIG. 15 is a diagram for explaining the operation for multi-carrier. In FIG. 15, the first carrier CC1 and the second carrier CC2 are continuous in the frequency direction.

  As illustrated in FIG. 15, the eNB 200 stops applying PUCCH hopping, selects a radio resource included in the first carrier CC1 as a PUCCH resource, and selects a radio resource included in the second carrier CC2. Select as PD2DSCH resource.

  Specifically, the eNB 200 allocates radio resources included in one PUCCH region of the first carrier CC1 as PUCCH resources as allocation in the period (slot) T1. Also, the eNB 200 allocates radio resources included in the second carrier CC2 as PD2DSCH resources as allocation in the period (slot) T1.

  Similarly, the eNB 200 allocates radio resources included in the one PUCCH region as PUCCH resources in the period (slot) T2 as in the period (slot) T1. Also, the eNB 200 allocates radio resources included in the second carrier CC2 as PD2DSCH resources as allocation in the period (slot) T2.

(2.3) Operation Sequence In the operation pattern 1 in the case of a single carrier and the operation in the case of a multicarrier according to the second embodiment, PUCCH hopping is stopped only in a subframe in which the PUCCH resource and the PD2DSCH resource overlap in time. May be.

  However, if PUCCH hopping is stopped only in some of such subframes, the PUCCH allocation pattern differs between UE 100-1 that stops PUCCH hopping and other UEs that do not stop PUCCH hopping. Conflicts may occur.

  Therefore, it is preferable that eNB200 transmits the stop information which shows the period (subframe) which should stop application of PUCCH hopping with respect to UE100-1 and other UE. And since the said other UE can also arrange | position a PUCCH allocation pattern by stopping application of PUCCH hopping, the competition of PUSCH resources can be avoided.

  The stop information is a subframe number of a subframe in which application of PUCCH hopping should be stopped. Alternatively, when an arrangement for stopping application of PUCCH hopping in a subframe after a predetermined period (for example, 4 subframes) after transmission / reception of stop information is determined in advance, the stop information may be a simple flag.

  Moreover, stop information is alert | reported by the common area | region or system information block (SIB) of PDCCH, for example. Alternatively, the stop information may be notified by unicast, for example, by an RRC message.

  FIG. 16 is an operation sequence diagram according to the second embodiment. In FIG. 16, UE100-3 is UE which performs only cellular communication, for example.

  As shown in FIG. 16, in step S301, the UE 100-1 establishes an RRC connection with the eNB 200. In step S302, the UE 100-3 establishes an RRC connection with the eNB 200.

  In step S303, the UE 100-1 transmits an allocation request (Scheduling Request) for requesting allocation of cellular radio resources and D2D radio resources to the eNB 200.

  In step S304, the eNB 200 selects (that is, schedules) a cellular radio resource and a D2D radio resource to be allocated to the UE 100-1.

  In step S305, the eNB 200 determines that another UE 100-3 in which PUCCH allocation occurs in a subframe in which a PUCCH resource and a D2D radio resource to be allocated to the UE 100-1 overlap in time (that is, a subframe in which PUCCH hopping should be stopped). Check if it exists.

  If “YES” in step S305, in step S306, stop information (Stop hopping information) for specifying a subframe in which PUCCH hopping is to be stopped is transmitted to the UE 100-1 and the UE 100-3.

  In step S307, the UE 100-1 that has received the stop information confirms whether or not the current subframe is a subframe in which PUCCH hopping should be stopped based on the stop information. If “YES” in step S307, in step S308, the UE 100-1 stops PUCCH hopping in the subframe.

  Similarly, in step S309, the UE 100-3 that has received the stop information confirms based on the stop information whether the current subframe is a subframe in which PUCCH hopping should be stopped. If “YES” in step S309, in step S310, the UE 100-3 stops PUCCH hopping in the subframe.

  In step S311, UE100-1 transmits an uplink control signal to eNB200 using a PUCCH resource. Furthermore, UE100-1 transmits user data using a D2D radio | wireless resource (PD2DSCH resource) or a PUSCH resource.

  In step S312, UE100-3 transmits an uplink control signal to eNB200 using a PUCCH resource.

(Summary of the second embodiment)
As described above, the eNB 200 allocates D2D radio resources after stopping PUCCH hopping. This facilitates securing a certain frequency interval between the cellular radio resource (PUCCH resource) and the PD2DSCH resource.

  Or eNB200 performs D2D radio | wireless resource allocation according to PUCCH hopping, without stopping PUCCH hopping. Thereby, it is possible to obtain the frequency diversity effect and to transmit the uplink control signal satisfactorily.

[Other Embodiments]
In each embodiment mentioned above, UE100-1 transmitted simultaneously radio signal SG1 in cellular communication, and radio signal SG2 in D2D communication. However, the UE 100-1 may simultaneously transmit the radio signal SG1 in D2D communication and the radio signal SG2 in D2D communication. FIG. 17 is a diagram for explaining the other embodiment 1. FIG. As shown in FIG. 17, UE100-1 thru | or UE100-3 are located in the cell of eNB200. UE100-1 performs D2D communication with UE100-2 and UE100-3 under control of eNB200. The UE 100-1 transmits a radio signal SG1 in D2D communication to the UE 100-2, and transmits a radio signal SG2 in D2D communication to the UE 100-3. The radio signal SG1 and the radio signal SG2 have different frequencies. In the operating environment illustrated in FIG. 17, the UE 100-2 is located far from the UE 100-1. UE100-3 is located in the vicinity of UE100-1. Therefore, UE100-1 transmits radio signal SG1 with high transmission power, and transmits radio signal SG2 with low transmission power. You may apply the operation | movement which concerns on each embodiment mentioned above with respect to such an operation environment. In this case, the resource allocation for the UE 100-1 may be performed by the eNB 200, the UE 100-2, or the UE 100-3 alone or in cooperation.

  Or UE100 may transmit simultaneously radio signal SG1 in cellular communication, and radio signal SG2 in cellular communication. FIG. 18 is a diagram for explaining another embodiment 2. FIG. As illustrated in FIG. 18, a pico eNB (PeNB) 200-2 is provided in a cell of a macro eNB (MeNB) 200-1. UE100 is located in the cell of PeNB200-2. UE100 performs cellular communication with MeNB200-1 and PeNB200-2 by control of MeNB200-1 and PeNB200-2 by double connection. The UE 100 transmits a radio signal SG1 in cellular communication to the MeNB 200-1, and transmits a radio signal SG2 in cellular communication to the PeNB 200-2. The radio signal SG1 and the radio signal SG2 have different frequencies. In the operating environment illustrated in FIG. 18, the UE 100 is located far from the MeNB 200-1 and is located in the vicinity of the PeNB 200-2. Therefore, UE100 transmits radio signal SG1 with high transmission power, and transmits radio signal SG2 with low transmission power. You may apply the operation | movement which concerns on each embodiment mentioned above with respect to such an operation environment. In this case, the resource allocation for the UE 100 may be performed by the MeNB 200-1 or the PeNB 200-2 alone or in cooperation.

  In each of the embodiments described above, when there is a time zone in which the wireless terminal transmits SG1 and SG2 simultaneously and a time zone in which the wireless terminal performs independent transmission without performing simultaneous transmission, the wireless terminal performs simultaneous transmission. The above-described operation may be performed only during the time period in which the above operation is performed, and the above-described operation may not be applied during the time period during which single transmission is performed.

  In each embodiment mentioned above, although the LTE system was demonstrated as an example of a cellular communication system, it is not limited to a LTE system, You may apply this invention to systems other than a LTE system.

  DESCRIPTION OF SYMBOLS 10 ... E-UTRAN, 20 ... EPC, 100 ... UE, 101 ... Antenna, 110 ... Radio transceiver, 120 ... User interface, 130 ... GNSS receiver, 140 ... Battery, 150 ... Memory, 160 ... Processor, 200 ... eNB , 201 ... antenna, 210 ... wireless transceiver, 220 ... network interface, 230 ... memory, 240 ... processor, 300 ... MME / S-GW

Claims (14)

A communication control device used in a mobile communication system having a user terminal that transmits a first radio signal to a first radio communication device and transmits a second radio signal to a second radio communication device,
A control unit that selects at least one of a first radio resource to be allocated to transmission of the first radio signal and a second radio resource to be allocated to transmission of the second radio signal;
The transmission power of the first radio signal is different from the transmission power of the second radio signal,
The control unit determines at least one of the first radio resource and the second radio resource so as to ensure a certain frequency interval between the first radio resource and the second radio resource. A communication control device characterized by selecting. The control unit obtains a parameter for setting the constant frequency interval from the user terminal,
The parameter is determined according to the capability of the user terminal,
The communication control apparatus according to claim 1, wherein the control unit sets the constant frequency interval based on the parameter. The parameter indicates a plurality of frequency intervals that are defined in stages according to the degree of attenuation of leakage power,
The communication control device according to claim 2, wherein the control unit preferentially sets a wide frequency interval as the constant frequency interval among the plurality of frequency intervals based on the parameter. One carrier used in the mobile communication system includes a pair of radio resource regions provided at least with the fixed frequency interval,
The control unit selects a radio resource included in one radio resource area from the pair of radio resource areas as the first radio resource, and selects the radio resource area as the other radio resource area from the pair of radio resource areas. The communication control apparatus according to claim 1, wherein an included radio resource is selected as the second radio resource. One carrier used in the mobile communication system includes a pair of radio resource regions provided at least with the fixed frequency interval,
The first radio signal is applied with frequency hopping as the first radio resource, in which radio resources included in the one radio resource area and radio resources included in the other radio resource area are alternately allocated. An uplink control signal,
The control unit stops application of the frequency hopping, selects a radio resource included in the one radio resource region as the first radio resource, and a radio included in the other radio resource region. The communication control apparatus according to claim 1, wherein a resource is selected as the second radio resource. One carrier used in the mobile communication system includes a pair of radio resource regions provided at least with the fixed frequency interval,
The first radio signal is applied with frequency hopping as the first radio resource, in which radio resources included in the one radio resource area and radio resources included in the other radio resource area are alternately allocated. An uplink control signal,
The control unit determines a radio resource included in a radio resource area opposite to the radio resource area including the first radio resource from the pair of radio resource areas according to the frequency hopping hopping pattern. The communication control apparatus according to claim 1, wherein the communication control apparatus is selected as a radio resource. The second radio signal is a radio signal including user data;
The control unit notifies the user terminal of allocation information related to the second radio resource;
The said allocation information shows the number which the radio | wireless resource which comprises the said 2nd radio | wireless resource starts in the frequency direction from the carrier end of the said carrier, and is characterized by the above-mentioned. The communication control device described. At least the fixed frequency interval is provided between the first carrier and the second carrier used in the mobile communication system,
The control unit selects a radio resource included in the first carrier as the first radio resource, and selects a radio resource included in the second carrier as the second radio resource. The communication control device according to claim 1, characterized in that: The first carrier and the second carrier used in the mobile communication system are continuous in the frequency direction,
The control unit sets a radio resource included in the first carrier as the first radio resource while ensuring the fixed frequency interval between the first radio resource and the second radio resource. The communication control apparatus according to claim 1, wherein a radio resource included in the second carrier is selected as the second radio resource. The first radio signal includes, as the first radio resource, a radio resource included in one radio resource area and a radio resource included in the other radio resource area of a pair of radio resource areas in the first carrier. Is an uplink control signal to which frequency hopping is alternately assigned.
The control unit stops application of the frequency hopping, selects a radio resource included in the first carrier as the first radio resource, and selects a radio resource included in the second carrier. The communication control device according to claim 9, wherein the communication control device is selected as the second radio resource.   The communication control apparatus according to claim 10, wherein the control unit transmits information indicating a period in which application of the frequency hopping should be stopped to a plurality of user terminals including the user terminal. The mobile communication system supports D2D communication, which is direct inter-terminal communication,
The communication control apparatus according to any one of claims 1 to 11, wherein at least one of the first wireless communication apparatus and the second wireless communication apparatus is a user terminal. The mobile communication system supports a double connection in which a pair of cells that are a combination of cells managed by different base stations and the user terminal establish a pair of connections,
The communication control apparatus according to any one of claims 1 to 11, wherein each of the first wireless communication apparatus and the second wireless communication apparatus is a base station. A user terminal that transmits a first radio signal to a first radio communication device and transmits a second radio signal to a second radio communication device;
The transmission power of the first radio signal is different from the transmission power of the second radio signal,
The user terminal is configured to select at least one of a first radio resource assigned to transmit the first radio signal and a second radio resource assigned to transmit the second radio signal. A transmission unit for transmitting a parameter for setting a certain frequency interval to be secured between the first radio resource and the second radio resource;
The parameter is determined according to the capability of the user terminal.

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