Patent Publication Number: US-2019200375-A1

Title: User equipment and communication method

Description:
TECHNICAL FIELD 
     The present invention relates to a user equipment in a radio communication system. 
     BACKGROUND ART 
     Currently, in a 3 rd  generation partnership project (3GPP), a next generation system, which corresponds to a successor of long term evolution (LTE)-advanced as one of fourth generation radio communication systems and is called 5G, has been examined. In the 5G, three use cases including an extended mobile broadband (eMBB), a massive machine type communication (mMTC), and an ultra reliability and low latency communication (URLLC) are mainly assumed. 
     The URLLC is aimed at realization of a radio communication with low latency and high reliability. In the URLLC, as a specific plan for realization of low latency, introduction of a short transmission time interval (TTI) length (also referred to as a subframe length, or a subframe interval), shortening of control latency from packet generation to data transmission, and the like have been examined. In addition, as a specific plan for realization of high reliability in the URLLC, introduction of a coding mode with a low coding rate and a modulation mode for realization of a low bit error rate, utilization of diversity, and the like have been examined. 
     CITATION LIST 
     Non-Patent Document 
     Non-Patent Document 1: 3GPP TS 36.300 V13.4.0 (2016-06) 
     Non-Patent Document 2: 3GPP TS 36.321 V13.2.0 (2016-06) 
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     It is considered that operation of the URLLC is made with a carrier with a frequency that is low to a certain extent because it is difficult to secure sufficient coverage with a carrier with a high frequency. On the other hand, in 5G, it is assumed that operation with multi-carriers is made to realize a high data rate in eMBB. The operation with the multi-carriers is also assumed even in the URLLC on the assumption URLLC traffic and another traffic (for example, eMBB traffic using a carrier with a high frequency) are mixed in a user equipment. 
     Here, in a case where URLLC traffic data is allowed to flow with respect to a carrier that does not cope with the URLLC (that does not satisfy either ultralow latency or high reliability), there is a possibility that a service required condition may not be satisfied, and thus it is necessary to perform transmission and reception of the URLLC traffic by using a specific carrier in the multi-carrier operation. That is, in a user equipment that makes the multi-carrier operation, there is a demand for a technology of performing transmission by suitably selecting a carrier with respect to a specific kind of traffic. This problem may occur in the entirety of communications in the multi-carrier operation without limitation to the URLLC. 
     The invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a technology capable of transmitting data by using a suitable carrier in a user equipment that performs data transmission by using a plurality of carriers. 
     Means for Solving Problem 
     According to a technology that is disclosed, there is provided A user equipment in a radio communication system, the user equipment including: 
     a storage unit that stores configuration information in which priority of data is associated with a carrier or a carrier group; 
     a selection unit that determines priority of transmission data that is transmitted from the user equipment, and selects a carrier or a carrier group that corresponds to the priority that is determined on the basis of the configuration information; and 
     a transmission unit that transmits the transmission data by using the carrier or the carrier group that is selected by the selection unit. 
     Effect of the Invention 
     According to the technology that is disclosed, it is possible to provide a technology capable of transmitting data by using a suitable carrier in a user equipment that performs data transmission by using a plurality of carriers. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a configuration diagram of a radio communication system according to an embodiment of the invention; 
         FIG. 2  is a configuration diagram of a radio communication system according to the embodiment of the invention; 
         FIG. 3  is a view illustrating an operation of switching a carrier in accordance with priority of data in a first embodiment; 
         FIG. 4  is a view illustrating the operation of switching the carrier in accordance with the priority of data in the first embodiment; 
         FIG. 5  is a view illustrating an example of a transmission power control in a second embodiment; 
         FIG. 6  is a view illustrating an example of the transmission power control in the second embodiment; 
         FIG. 7  is a view illustrating identification of transmission power priority in accordance with a TTI length; 
         FIG. 8  is a view illustrating an example of the transmission power control in the second embodiment; 
         FIG. 9  is a view illustrating a priority control of a logical channel in a third embodiment; 
         FIG. 10  is a view illustrating the priority control of the logical channel in the third embodiment; 
         FIG. 11  is a view illustrating an example of scheduling for UL data transmission; 
         FIG. 12  is a view illustrating an example of the scheduling for UL data transmission; 
         FIG. 13  is a view illustrating an example of the scheduling for UL data transmission; 
         FIG. 14  is a view illustrating an example of a functional configuration of a user equipment  10 ; 
         FIG. 15  is a view illustrating an example of a functional configuration of a base station  20 ; and 
         FIG. 16  is a view illustrating an example of a hardware configuration of the user equipment  10  and the base station  29 . 
     
    
    
     MODE(S) FOR CARRYING OUT THE INVENTION 
     Hereinafter, an embodiment (this embodiment) of the invention will be described with reference to the accompanying drawings. Furthermore, the following embodiment to be described below is illustrative only, and an embodiment to which the invention is applied is not limited to the following embodiment. 
     It is assumed that a radio communication system of this embodiment supports at least an LTE communication mode. Accordingly, an existing technology defined in the LTE can be appropriately used in an operation of the radio communication system. However, the existing technology is not limited to the LTE. In addition, it is assumed that “LTE” in this specification has broad meaning including LTE-Advanced, and a mode (for example, 5G) subsequent to the LTE-Advanced unless otherwise stated. In addition, the invention is also applicable to a communication mode other than the LTE. 
     Whole Configuration of System 
       FIG. 1  illustrates a configuration diagram of the radio communication system according to this embodiment (common to first to third embodiments). The radio communication system according to this embodiment performs a communication with multi-carriers (a plurality of carriers) by the same configuration as that of dual connectivity (for example, Non-Patent Document 1; hereinafter, referred to as “DC”) in LTE. As illustrated in  FIG. 1 , the radio communication system includes a user equipment  10 , a master base station  20 , and a slave base station  30 . In the drawing, a base station is described as “BS” for convenience. The BS is an abbreviation of the base station. The master base station  20  corresponds to MeNB of the DC, and the slave base station  30  corresponds to SeNB of the DC. Furthermore, the “master” and the “slave” are terms which are given for convenience of discrimination of two base stations. Furthermore, the master base station  20  may be a plurality of master base stations, and the slave base station  30  may be a plurality of slave base stations. 
     In addition, in  FIG. 1 , a user equipment  40  is also illustrated, and transmission and reception of a D2D signal can be performed between the user equipment  10  and the user equipment  40 . In the transmission and reception of the D2D signal, for example, a sidelink technology (for example, Non-Patent Document 1) of LTE can be used. 
       FIG. 2  illustrates another configuration example of the radio communication system related to this embodiment (common to the first to third embodiments). In the example illustrated in  FIG. 2 , a communication with multi-carriers is performed by carrier aggregation (hereinafter, described as “CA”) instead of the DC. As illustrated in  FIG. 2 , a base station  20  and the user equipment  10  are provided, and a communication by the CA is possible between the base station  20  and the user equipment  10 . Furthermore, the base station  20  is the master base station  20  in a case where the DC is not constituted. 
     In this embodiment, since the CA and the DC are used, and thus an overview of the CA and the DC in LTE will be described below. 
     The CA is a mode that performs a communication by simultaneously using a plurality of carriers in a state in which a predetermined bandwidth (maximum: 20 MHz) as a basic unit. A carrier that becomes a basic unit in the CA is referred to as a component carrier (CC). 
     When the CA is performed, a primary cell (PCell) that is a cell with high reliability for securement of connectivity and a secondary cell (SCell) that is an accompanying cell are set with respect to the user equipment. First, the user equipment is connected to the PCell and can add the SCell as necessary. The PCell is the same cell as a single cell that supports radio link monitoring (RLM) and semi-persistent scheduling (SPS). 
     The SCell is a cell that is added to the PCell and is set to the user equipment. Addition and deletion of the SCell is performed by radio resource control (RRC) signaling. Immediately after being set to the user equipment, the SCell enters a deactive state, and thus the Scell is a cell capable of establishing a communication (capable of being scheduled) for the first time when being activated. 
     The DC is a mode that performs a simultaneous communication by using CCs under another base station, and realizes a high throughput. That is, in the DC, the user equipment performs a communication by simultaneously using radio resources of two base stations which are physically different. 
     The DC is a kind of the CA, and is also called inter-eNB CA (inter-base station carrier aggregation). A master-eNB (MeNB) and a secondary-eNB (SeNB) are introduced to the DC. In the DC, a cell group constituted by a cell (one or a plurality of cells) under the MeNB is referred to as a master cell group (MCG), and a cell group constituted by a cell (one or a plurality of cells) under the SeNB is referred to as a secondary cell group (SCG). A CC of UL is set to at least one SCell in the SCG, and a PUCCH is set to one SCell. The SCell is referred to as a primary SCell (PSCell). 
     In addition, a split bearer is introduced to the DC. In an UL sprit bearer that is a target of this embodiment, data of one bearer is divided in the user equipment. One piece of divided data of the bearer is transmitted to one base station, and the other piece of divided data of the bearer is transmitted to the other base station. 
     Hereinafter, in a case of using a configuration (configuration of  FIG. 1 ) of the DC, it is assumed that the UL split bearer is applied to a transmission target bearer, but the UL split bearer may not be applied. Even when the UL split bearer is not applied, the same operation is possible. 
     With Respect to Priority of Data 
     In respective embodiment to be described below, priority of data (may also be referred to as “packet”) is used, and thus description will now be given of an example of the priority. 
     Priority of DL data is priority related to a bearer, and examples thereof include a QCI. Priority of UL data is priority related to a bearer that carries the data, and examples thereof include QCI. In addition, the priority of the UL data may be priority of a logical channel without limitation to the priority of the bearer. In addition, the priority of the UL data may be priority for each transport block (TB). For example, priority of sidelink (SL) data may be priority of a logical channel, priority for each TB, or priority for each transmission resource pool. 
     Furthermore, the level of the priority may be opposite to a magnitude of a value (for example, the QCI) indicating the priority. However, in the following description, description will be made on the assumption that the greater a numerical value of priority is, the higher the priority is unless otherwise stated. 
     First Embodiment 
     First, a first embodiment will be described. In the first embodiment, the user equipment  10  selects a carrier that transmits data in accordance with the priority of the data to be transmitted, and transmits the data by using the carrier. Furthermore, it is assumed that “data” in this embodiment is data that is mapped to a logical channel (for example, CCCH, DCCH, DTCH, and STCH) corresponding to a shared channel (for example, UL/SL-SCH, PUSCH, and PSSCH), but there is no limitation thereto. 
     Operation Example in DC 
     An operation example in a configuration of the DC will be described with reference to  FIG. 3 . As illustrated in  FIG. 3 , the user equipment  10  includes a switching control unit  103  that performs carrier selection based on priority, a master-side transmission unit  11  that performs transmission using a carrier of the master base station  20 , and a slave-side transmission unit  12  that performs transmission using a carrier of the slave base station  30 , as a configuration for transmission. 
     With regard to the master base station  20  and the slave base station  30 ,  FIG. 3  illustrates a protocol configuration (Non-Patent Document 1) corresponding to an existing split bearer, but this is illustrative only. It is possible to employ any configuration as long as a bearer can be divided between a plurality of base stations according to the configuration. 
     The user equipment  10  is notified of priority for each carrier (may be for each BS, or for each carrier group) from the base station (for example, the master base station  20 ) through higher layer signaling (for example, RRC signaling), and the priority is stored in the switching control unit  103  as configuration information in combination with information of a corresponding carrier and the like. Furthermore, the user equipment  10  may be notified of the priority from the master base station  20 , or the user equipment  10  may be notified of the priority from the slave base station  30 . 
     For example, priority corresponding to a certain carrier (or BS or carrier group) represents that data with priority equal to or lower than the priority can be transmitted with the carrier (or BS or carrier group). As an example, notification of 3 is given as priority corresponding to a carrier 1, data with priority equal to or lower than 3 can be transmitted with the carrier 1. In addition, priority corresponding to a certain carrier (or BS or carrier group) may represent that data with priority equal to or higher than the priority can be transmitted with the carrier (or BS or carrier group). In this case, as an example, in a case where notification of 3 is given as priority corresponding to the carrier 1, data with priority of 3 or greater can be transmitted with the carrier 1. 
     In addition, priority corresponding to a certain carrier (or BS or carrier group) may represent that data with priority equal to or lower than the priority cannot be transmitted with the carrier (or BS or carrier group). As an example, in a case where notification of 3 is given as priority corresponding to the carrier 1, it is not possible to transmit data with priority of 3 or less with the carrier 1. In addition, priority corresponding to a certain carrier (or BS or carrier group) may represent that data with priority equal to or higher than the priority cannot be transmitted with the carrier (or BS or carrier group). In this case, as an example, in a case where notification of 3 is given as priority corresponding to the carrier 1, it is not possible to transmit data with priority of 3 or greater with the carrier 1. 
     The above description is illustrative only. For example, all priorities at which transmission can be performed with a certain carrier or all priorities at which transmission cannot be performed with a certain carrier may be configured. 
     In the following description, description will be given of a switching control on the assumption that the master base station  20  has one UL carrier, and the slave base station  30  has one UL carrier for convenience. However, in the following description, similar processing is also possible even when “carrier” that is selected and used is substituted with “carrier group” (for example, a carrier group of MCG or a carrier group of SCG). Note that, in a case where the user equipment  10  transmits data by using the “carrier group”, transmission can be performed by using one carrier in the “carrier group”, or transmission can be performed by the CA with a plurality of carriers in the “carrier group”. In addition, the “carrier group” and the base station that constitutes the DC may be regarded as the same. In addition, the “carrier group” and a “cell group” may be regarded as the same. 
     Data to be transmitted is sequentially input to the switching control unit  103  of the user equipment  10 . The data may be a PDCP packet, an RLC packet, a MAC packet, or a packet other than these packets. 
     For example, the switching control unit  103  determines priority of data on the basis of a header of the data that is input, and determines a carrier that transmits the data on the basis of configuration information and the priority. 
     In addition, in a case where the carrier that is determined is a carrier for the master base station  20 , the switching control unit  103  delivers the data to the master-side transmission unit  11 , and the master-side transmission unit  11  transmits the data by using the carrier. In a case where the carrier that is determined is a carrier for the slave base station  30 , the switching control unit  103  delivers the data to the slave-side transmission unit  12 , and the slave-side transmission unit  12  transmits the data by using the carrier. 
     In addition, in a case where data that is input is data capable of being transmitted with any one of the carrier for the master base station  20  and the carrier for the slave base station  30 , for example, the switching control unit  103  may sequentially divide the data into data to be transmitted with the carrier for the master base station  20  and data to be transmitted with the carrier for the slave base station  30  in a ratio that is determined in advance, or may select a carrier in correspondence with a congestion situation of the carrier for the master base station  20  and the carrier for the slave base station  30 . 
     In the example in  FIG. 3 , data with priority X is transmitted with both the carrier for the master base station  20  and the carrier for the slave base station  30 , and data with priority Y is transmitted with the carrier for the slave base station  30 . 
     According to the above-described configuration, for example, data with high priority can be transmitted only with a carrier with high QoS. 
     Operation Example in CA 
     Next, an operation example of a configuration in the CA (CA not DC) will be described with reference to  FIG. 4 . As illustrated in  FIG. 4 , as a configuration for transmission, the user equipment  10  includes the switching control unit  103  that performs carrier selection based on priority, a carrier 1-side transmission unit  13  that performs transmission using the carrier 1, and a carrier 2-side transmission unit  14  that performs transmission using a carrier 2. Note that, a configuration in which the number of carriers is set to 2 is illustrative only, and three or greater carriers may exist. 
     With regard to the base station  20 ,  FIG. 4  illustrates a protocol configuration (Non-Patent Document 1) corresponding to existing LTE, but this configuration is illustrative only. 
     Priority that is described above is configured to the user equipment  10  through higher layer signaling, and the priority is stored in the switching control unit  103  as configuration information in combination with information of a corresponding carrier. 
     Data to be transmitted is sequentially input to the switching control unit  103  of the user equipment  10 . The data may be a PDCP packet, an RLC packet, a MAC packet, or a packet other than the packets. 
     For example, the switching control unit  103  determines priority of data on the basis of a header of the data that is input, and determines a carrier that transmits the data on the basis of configuration information and the priority. 
     In addition, in a case where the carrier that is determined is the carrier 1, the switching control unit  103  delivers the data to the carrier 1-side transmission unit  13 , and the carrier 1-side transmission unit  13  transmits the data by using the carrier 1. In a case where the carrier that is determined is the carrier 2, the switching control unit  103  delivers the data to the carrier 2-side transmission unit  14 , and the carrier 2-side transmission unit  14  transmits the data by using the carrier 2. 
     In addition, in a case where data that is input is data capable of being transmitted with any one of the carrier 1 or the carrier 2, for example, the switching control unit  103  may divide the data into data to be transmitted with the carrier 1 and data to be transmitted with the carrier 2, or may select a carrier in correspondence with a congestion situation of the carrier 1 and the carrier 2. 
     In the example of  FIG. 4 , data with the priority X is transmitted with the carrier 1, and data with the priority Y is transmitted with the carrier 2. According to the above-described configuration, for example, data with high priority can be transmitted only with a carrier with high QoS. 
     Example of SL 
     In a case where the user equipment  10  performs transmission of a D2D signal to another user equipment  40 , when performing transmission by using a plurality of carriers similar to the above described CA, the user equipment  10  can perform a carrier selection operation in the same manner as in the transmission with respect to the base station  20  as described with reference to  FIG. 4 . In addition, in a case where the user equipment  10  performs simultaneous transmission with respect to the base station  20  and the other user equipment  40  similar to the case of the DC, the carrier selection operation can be performed in the same manner as in the transmission with respect to two base station as described with reference to  FIG. 3 . 
     With Respect to Simultaneous Transmission of UL Control Information and UL Data 
     In the respective examples as described above, in the user equipment  10 , transmission of UL control information (for example, ACK/NACK and CSI) with an UL control channel (for example, PUCCH), and transmission of UL data may simultaneously occur in carriers different from each other (or carrier groups different from each other). For example, transmission of UL control information to the master base station  20 , and transmission of data to the slave base station  30  may simultaneously occur. 
     In a case where the user equipment  10  has a simultaneous transmission capability as described above, the simultaneous transmission is performed, but a case where the user equipment  10  does not have the simultaneous transmission capability as described above is also considered. To cope with this case, the master base station  20  (or the base station  30 ) may configure transmission priority, which indicates which is prioritized between the UL control information and the UL data, to the user equipment  10  not having simultaneous transmission capability through higher layer signaling. In addition, instead of configuring from the base station, priority between them may be determined in advance. 
     In the priority configuration, when priority is given to transmission of the UL data, it is possible to enhance reliability of the UL data transmission. In addition, when priority is given to transmission of the UL control information, it is possible to indirectly enhance reliability of downlink data reception. 
     In addition, when simultaneous transmission with carriers different from each other occurs, the user equipment  10  may determine a priority relationship between transmission of the UL control information and transmission of the UL data on the basis of contents of the UL control information. For example, in a case where priority is given to transmission of ACK/NACK in comparison to transmission of the UL data, but only a CSI feedback is transmitted, the user equipment  10  can make a determination of giving priority to transmission of the UL data, and the like. 
     In addition, it is also considered that simultaneous transmission of the UL control information occurs in a plurality of carriers different from each other (or a plurality of carrier groups different from each other). To cope with a case where the user equipment  10  does not have the simultaneous transmission capability, the master base station  20  (or the base station  30 ) may configure transmission priority, which indicates which carrier&#39;s UL control information is prioritized, to the user equipment  10  without having simultaneous transmission capability through higher layer signaling. In addition, instead of setting from the base station, a preferential side may be determined in advance. For example, when raising priority of UL control information of a carrier in which priority of DL data is high, it is possible to enhance reliability. 
     Note that, a case where cross-carrier scheduling is performed in any of the DC, the CA, and the SL is considered. In the cross-carrier scheduling, scheduling with respect to carriers different from each other is performed by using downlink control information that is transmitted with a certain carrier. When performing the cross-carrier scheduling, in a case where search spaces between carriers overlap each other, the user equipment  10  may determine which carrier is prioritized for search in advance, or it may be configured through higher layer signaling. 
     Another Example of Priority Configuration 
     With regard to data with specific priority, explicit higher layer signaling may not be carried out to the user equipment  10  from the base station  20 , and which carrier to use between a carrier (or a carrier group) of the master base station  20  and a carrier (or a carrier group) of the slave base station  30  may be determined in advance. For example, with regard to data of default bearer, configuration such as transmission is always performed to the master base station  20  may be made in advance. In this manner, by introducing configuration without higher layer signaling, it is possible to reduce a signaling overhead. 
     In addition, configuration, in which transmission of all pieces of data by the user equipment  10  is limited to only one base station (or one carrier group) (or one carrier), may be permitted. According to this configuration, actually, a split bearer is not necessary for an uplink, and implementation of the user equipment  10  (and base station) becomes simple. In addition, it is possible to reliably avoid simultaneous transmission with respect to a plurality of base stations, and it is easy to realize high QoS. 
     In addition, the user equipment  10  may be dynamically notified of transmission possible priority from the base station  20  (or base station  30 ) with UL (SL) grant. For example, notification of the highest priority and/or the lowest priority of data corresponding to a transmission possible carrier is given with control information for UL scheduling, or notification of an index corresponding to a priority group (range) configured through higher layer signaling is given. Note that, for example, the highest priority is the highest priority at which a corresponding carrier can be used. In addition, for example, the lowest priority is the lowest priority at which a corresponding carrier can be used. In this manner, by notifying of transmission possible priority dynamically, a QoS control corresponding to instantaneous quality of the base station/carrier becomes possible. 
     Second Embodiment 
     Next, a second embodiment will be described. The second embodiment is an aspect in which the carrier switching based on the data priority in the first embodiment is set as a basic configuration, and in addition to the basic configuration, a transmission power control, in which transmission of data with high priority is preferentially performed, is performed when simultaneous transmission with carriers different from each other occurs. 
     An operation example in the second embodiment will be described with reference to  FIG. 5  and  FIG. 6 . As illustrated in  FIG. 5 , the user equipment  10  includes a transmission power control unit  104 . Here, as illustrated in  FIG. 5 , it is assumed that transmission of data with priority X with a carrier (or a carrier group) for the master base station  20 , and transmission of data with priority Y with a carrier (or a carrier group) for the slave base station  30  simultaneously occur. In addition, it is assumed that a relationship of the priority Y&gt;the priority X is established (the priority Y is higher than the priority X). 
     In this case, the transmission power control unit  104  preferentially allocates transmission power to transmission of data with high priority, and transmission power is allocated to transmission of data with low priority in a remaining power range obtained by subtracting the transmission power allocated to the transmission of data with high priority from the maximum transmission power of the user equipment  10 . In a case where required transmission power exceeds the maximum transmission power of the user equipment  10  due to simultaneous transmission, power scaling (power reduction from the required transmission power) is performed with respect to the transmission of data with low priority. Or, in a case where the transmission power exceeds the maximum transmission power of the user equipment  10 , the transmission of data with low priority may be dropped (transmission is not performed). 
     Specifically, as illustrated in  FIG. 6 , in this case, first, transmission power (indicated by A) is allocated with respect to data transmission with the priority Y. Next, transmission power (indicated by B) is allocated to data transmission with the priority X. In this case, since A+B exceeds the maximum transmission power of the user equipment  10 , scaling of transmission power with respect to data transmission with priority X is performed, and allocation of transmission power indicated by C is performed. 
     Note that, in the transmission power control, the transmission power control unit  104  may recognize priority by a transmission TTI length instead of priority of data. As an example, as illustrated in  FIG. 7 , it is considered that data transmission by a short TTI length is preferentially performed in comparison to data transmission by a long TTI length. Here, when a TTI length of a carrier for the slave base station  30  is shorter than a TTI length of a carrier for the master base station  20 , a priority relationship like a priority relationship illustrated in  FIG. 5  is established, and a transmission power control as illustrated in  FIG. 6  is executed. Typically, as the TTI is short, total transmission power is limited, and thus it is difficult to secure reliability. Accordingly, it is effective to preferentially allocate power to transmission by a short TTI. 
     The preferential control by the TTI length may be performed regardless of priority of data, or may be performed in a case where priority of data is the same between carriers. In addition, the preferential control by the TTI length may be applied to the switching control in the first embodiment. 
     Note that,  FIG. 5  illustrates an example of the DC. However, even in a case of the CA, it is possible to perform a transmission power control in the same manner as in the above-described transmission power control. 
     In a case of the DC, a case where a plurality of base stations, which constitute the DC, are asynchronous is considered. In this case, partial simultaneous transmission of carriers different from each other is also considered. An example of a transmission power control in this case is illustrated in  FIG. 8 .  FIG. 8  illustrates a case where time deviates between data transmission with the priority Y and data transmission with the priority X in the same priority relationship as the priority relationship described with reference to  FIG. 5 . In this case, as illustrated in  FIG. 8 , the transmission power control unit  104  executes the same transmission power control as in  FIG. 6  only for a time (indicated by T in  FIG. 8 ) at which data transmission with the priority Y and data transmission with the priority X overlap each other. 
     With Respect to Example of Transmission Power Control Between UL Data and UL Control Information Etc. 
     Hereinafter, description will be given of an example of a transmission power control related to a case where the user equipment  10  simultaneously performs transmission of data, transmission of information other than the data (for example, transmission of control information with a PUCCH, transmission of a preamble with a PRACH, and the like) with a plurality of carriers different from each other (a plurality of carrier groups different from each other). 
     For example, it is assumed that transmission of data is performed with a carrier A, and transmission of information other than the data is performed with a carrier B. In addition, it is assumed that priority of data transmitted with the carrier B is lower than priority of data transmitted with the carrier A. In this case, the transmission power control unit  104  may preferentially allocate transmission power for data transmission with the carrier A in comparison to transmission power for information transmission with the carrier B. 
     Specifically, for example, with regard to the transmission power allocation in transmission of data, priority configuration, in which transmission of the data is preferentially performed in comparison to information transmission (for example, transmission of control information with a PUCCH, transmission of a preamble with a PRACH, and the like) with a carrier (for example, the carrier B) different from a carrier (for example, the carrier A) with which the data is transmitted, is made with respect to the user equipment  10  in advance. Alternatively, the priority configuration may be made with respect to the user equipment  10  from the base station  20  through higher layer signaling. The transmission power control unit  104  can allocate transmission power in accordance with the priority configuration. 
     According to the above-described priority configuration, for example, it is possible to avoid inhibition of data transmission with high priority due to UL control information transmission with respect to data of a bearer with low priority. 
     In addition, in a case where simultaneous transmission of PRACH with carriers different from each other occurs, for example, the user equipment  10  preferentially performs transmission of the PRACH with a carrier that transmits data with high priority. That is, transmission power is preferentially allocated. In addition, the user equipment  10  may give the highest priority to the PRACH of the PCell regardless of the priority of data. According to this, it is effective to maintain connectivity. 
     Alternatively, the user equipment  10  may give the highest priority to the PRACH that performs transmission with a carrier that is associated with transmission of data with high priority in comparison to the PRACH of the PCell. In this case, it is effective to maintain priority of data. 
     In addition, in a case where the user equipment  10  simultaneously transmits UL control information with a plurality of carriers different from each other (a plurality of carrier groups different from each other), transmission priority (priority of transmission power allocation) may be set through higher layer signaling, or a preferential side may be determined in advance. When performing the priority control as described above, it is possible to enhance reliability, for example, by raising priority of UL control information of a carrier in which priority of DL data is high. 
     Third Embodiment 
     Next, a third embodiment will be described. In the third embodiment, description will be given of processing of multiplexing (allocating) data of a plurality of logical channels to a resource (that is, MAC PDU), which can be used, in UL data transmission of the user equipment  10 . A technology according to the third embodiment can be executed in combination with the first and second embodiments, or may be executed alone. For example, data of a logical channel is data that remains in a transmission buffer as data to be transmitted by the logical channel. 
     In LTE of the related art, allocation processing is constituted by two-round configuration (Non-Patent Document 2). For example, in a case where a logical channel of priority 1 (lowest bit rate X), a logical channel of priority 2 (lowest bit rate Y), and a logical channel of priority 3 (lowest bit rate Z) are configured to a user equipment in the order of higher priority, first, data (=data of X×TTI) corresponding to the lowest bit rate X of the logical channel with the priority 1 is allocated to the MAC PDU (=a resource that can be used), data corresponding to the lowest bit rate Y of the logical channel with the priority 2 is allocated to a resource that can be used, and then data corresponding to the lowest bit rate Z of the logical channel with the priority 3 is allocated to a resource that can be used. This is a first round. Next, in a second round, the entirety of remaining pieces of data of the logical channel with the priority 1, which is the highest priority, is allocated to a resource that can be used (if there is still available resource). In this manner, the entirety of pieces of data, which can be allocated, are allocated in the order of priority. 
     Note that, the lowest bit rate can be set to infinity, and with regard to a logical channel to which infinity is set, data is preferentially allocated to a resource that can be used in the first round. 
     As described above, when the lowest bit rate is set to infinity, it is possible to raise transmission priority of data of a specific logical channel, but there is a problem that the transmission priority is excessively raised. 
     With regard to the problem, in the third embodiment, in UL data transmission by the user equipment  10 , as illustrated in  FIG. 9 , allocation of data of a logical channel to a resource, which can be used, is performed as illustrated in  FIG. 9 . 
     As illustrated in  FIG. 9 , a plurality of logical channels with high priority are classified into groups. In an example illustrated in  FIG. 9 , the groups are identified by an exclusive allocation flag, and a group of logical channels to which an exclusive allocation flag 1 is applied becomes a group with high priority. A group of logical channels to which an exclusive allocation flag 0 is applied becomes a group with low priority. Configuration of the exclusive allocation flag may be performed from a base station through higher layer signaling, or may be performed through dynamic signaling (for example, by downlink control information). 
     First, the user equipment  10  repetitively performs the same allocation as in the first round of existing LTE in a group with high priority as long as transmission data and a resource that can be used are present. Then, in a case where remaining transmission data (that is, a remaining data amount of a transmission buffer) of logical channels in the group with high priority becomes 0, or in a case where a data amount of the transmission buffer becomes equal to or less than a predetermined value, the same allocation as in the first round of LTE is repetitively performed with respect to a group with next priority (here, a group to which an exclusive allocation flag 0 is given) as long as transmission data and a resource that can be used are present. 
     The data amount of the transmission buffer may be the sum of remaining transmission data of respective logical channels of a group with high priority, remaining transmission data of any one logical channel, or remaining transmission data of a logical channel with the highest priority in a group. 
     Note that, in a case of executing the third embodiment in combination with the first embodiment and/or the second embodiment, for example, the user equipment  10  sets a logical channel with which allocation of transmission data to a resource that can be used to only a logical channel corresponding to data (that is, data to which a carrier is allocated) for which selection of a carrier is performed by the switching control unit  103 . For example, in the example of  FIG. 9 , in a case where the carrier A is selected with respect to data with priority 5, the carrier B is selected with respect to data with priority 9, and a carrier is not selected with respect to data with priority other than the priority 5 and the priority 9, only data of a logical channel #3 and data of a logical channel #4 in  FIG. 9  are allocated to a resource that can be used. 
     Through the above-described processing, the lowest bit rate of a specific logical channel is not set to infinite, and thus it is possible to appropriately perform allocation of transmission data to a resource that can be used while avoiding a situation in which priority of the specific logical channel is excessively raised. 
     In addition to the processing illustrated in  FIG. 9 , processing as illustrated in  FIG. 10  may also be performed. The processing in  FIG. 10  is the same as the example in  FIG. 9  in that a group with high priority is provided. In the example illustrated in  FIG. 10 , the same processing as in the first round and the second round in LTE of the related art is performed in respective groups. 
     That is, as illustrated in  FIG. 10 , first, with respect to a logical channel #1 and a logical channel #2 of a group with high priority, a data size that is set in the order of priority is allocated to a resource that can be used in the first round. Specifically, data corresponding to the lowest bit rate X of a logical channel with priority 1 is allocated to a resource that can be used, and data corresponding to the lowest bit rate Y of a logical channel of priority 2 is allocated to a resource that can be used. Next, it transitions to the second round, and the entirety of pieces of data, which can be allocated to a resource that can be used, is allocated to the resource that can be used in the order of priority. 
     Then, the same processing is repeated in a group with next priority. In the example of  FIG. 10 , in a third round (corresponding to the first round of LTE), with respect to a logical channel #3 and a logical channel #4, a data size that is set is allocated to a resource that can be used in the order of priority. Next, it transitions to a fourth round (corresponding to the second round in LTE), and the entirety of pieces of transmission data, which can be allocated to a resource that can be used, is allocated to the resource that can be used in the order of priority. 
     Note that, in all of the examples in  FIG. 9  and  FIG. 10 , a configuration of data allocation repeating groups are set to two groups (exclusive allocation flag 1/0) is illustrative only. The data allocation repeating groups may be set to three or more kinds. According to this, priority can be given in a more flexible manner. 
     In addition, with respect to a priority index (priority 1, priority 2, priority 5, priority 9, and the like in  FIG. 9  and  FIG. 10 ) of a logical channel, data allocation repeating group may be determined in advance, or may be configured through higher layer signaling. For example, the following configuration and the like can be made. Specifically, the priority 1 and the priority 2 may be set to a first group, the priority 3 and the priority 4 may be set to a second group, and priority other than the priority may be set to a third group. 
     Note that, the following processing may also be applied to the technologies according to the embodiments described above. 
     In a case where UL or SL scheduling time lines different from each other are mixed in, when the user equipment  10  receives UL grant for UL transmission scheduling in TTIn at TTIn or TTIn-x (x is a positive integer), in the user equipment  10 , a resource that is scheduled in advance at the TTIn-x may be canceled at TTIn, and the resource that is scheduled in advance may be used for another scheduling. 
     For example, with respect to UL grant that is transmitted at different TTI, scheduling confirmation control information (confirmation or denial) may be notified of at a TTI in which UL transmission is scheduled with a downlink control CH. For example, in an example of  FIG. 11 , UL transmission of TTIn is scheduled in step S 101  (TTIn-x), notification of scheduling confirmation is given in step S 102  (TTIn), and UL data is transmitted in step S 103 .  FIG. 12  illustrates an example of denial (step S 202 ), and UL transmission based on scheduling at TTIn is performed in step S 203  and step S 204 .  FIG. 13  also illustrates an example of denial (step S 302 ), and UL transmission based on scheduling at TTIn is performed in step S 303  and step S 304  in another user equipment  40 . 
     The user equipment  10  that is subjected to previous UL scheduling can be set to transmission only in a case of receiving confirmation or set to non-transmission only in a case of receiving denial. Typically, it is considered that scheduling at a short time line is applied to a packet with high priority, and thus it is possible to increase a scheduling opportunity of the packet with high priority through the above-described control. 
     Transmission of the UL grant beforehand at a separate TTI is performed due to transmission preparation (coding and the like, transmission packet generation) in the user equipment  10 , and for example, UL grant in advance is used with respect to a user equipment  10  or a packet (a large-sized packet) in which processing time is required for transmission preparation, and UL grant at TTIn is used with respect to a user equipment  10  or a packet (a small-sized packet) in which processing time is not required for transmission preparation. 
     Scheduling confirmation control information may be transmitted in a common search space from the base station  20  to the user equipment  10 , or may be transmitted in a UE specific search space from the base station  20  to the user equipment  10 . In the former case, it is possible to cancel the entirety of advance UL grant with low priority in a case where scheduling with high priority is present. 
     Mixing-in of scheduling time lines different from each other may occur between user equipments, or in a user equipment. In a case where the mixing-in occurs in the user equipment  10 , the base station  20  may implicitly perform notification of scheduling confirmation control information at TTIn by presence or absence of UL grant. That is, in this case, in a case of receiving UL grant for TTIn at TTIn, the user equipment  10  discards advance UL grant for TTIn. 
     Device Configuration 
     Description will now be given of a functional configuration example of the user equipment  10  and the base station  20  which execute the operations of the embodiments as described above. In the following description, it is assumed that each device has the entirety of functions of the first to third embodiments, but the device may have only a function of one embodiment among the entirety of functions of the first to third embodiments, or only functions of two embodiments among the entirety of functions of the first to third embodiments. 
     User Equipment 
       FIG. 14  is a view illustrating an example of a functional configuration of the user equipment  10 . As illustrated in  FIG. 14 , the user equipment  10  includes a signal transmission unit  101 , a signal reception unit  102 , a switching control unit  103 , a transmission power control unit  104 , and a logical channel priority control unit  105 . The functional configuration illustrated in  FIG. 14  is illustrative only. A functional classification or the name of the functional units may be arbitrarily set as long as the operation according to this embodiment can be executed. 
     The signal transmission unit  101  creates a transmission signal, and wirelessly transmits the signal. The signal reception unit  102  includes a function of wirelessly receiving various signals and acquiring a signal of a further higher layer from a signal of a physical layer which is received. Note that, the master-side transmission unit  11 , the slave-side transmission unit  12 , the carrier 1-side transmission unit  13 , the carrier 2-side transmission unit  14 , and the like are included in the signal transmission unit  101 . 
     The switching control unit  103  has the carrier switching function based on data priority as described in the first and second embodiments. The transmission power control unit  104  has the transmission power control function as described in the second embodiment. The logical channel priority control unit  105  has a function of controlling the allocation of transmission data to a resource that can be used as described in the third embodiment. For example, the resource that can be used is an UL transmission resource that is allocated to the signal transmission unit  101  from the base station  20 . A transmission buffer that retains data of a logical channel may be retained by the logical channel priority control unit  105  or the signal transmission unit  101 . 
     Note that, a storage unit that stores configuration information that is received from the base station  20  may be retained by any one of the switching control unit  103 , the transmission control unit  104 , and the logical channel priority control unit  105 , may be retained by the signal reception unit  102 , or may be provided in the user equipment  10  as a functional unit other than the functional units illustrated in  FIG. 14 . 
     Base Station  20   
       FIG. 15  is a view illustrating an example of a functional configuration of the base station  20  according to this embodiment. Note that, the base station  20  may be a base station that constitutes the CA, or a base station (may be a master station or a slave station) that constitutes DC. 
     As illustrated in  FIG. 15 , the base station  20  includes a signal transmission unit  201 , a signal reception unit  202 , a priority management unit  203 , and a scheduling unit  204 . The functional configuration illustrated in  FIG. 15  is illustrative only. A functional classification or the name of the functional units may be arbitrarily set as long as the operation according to this embodiment can be executed. 
     The signal transmission unit  201  includes a function of generating a signal to be transmitted to a user equipment  10  side, and wirelessly transmitting the signal. The signal reception unit  202  includes a function of receiving various signals which are transmitted from the user equipment  10 , and acquiring information of, for example, a further higher layer from the signal that is received. In addition, the signal reception unit  202  receives the HARQ feedback that is transmitted from the user equipment  10 , and performs retransmission of data as necessary. 
     The priority management unit  203  performs creation of configuration information from the base station as described in the first to third embodiments, retention, and transmission through the signal transmission unit  201 . For example, the scheduling unit  204  performs resource allocation for UL data transmission by the user equipment  10 , and the like. In addition, the scheduling unit  204  can perform the scheduling as described in  FIG. 11  to  FIG. 13 . 
     Hardware Configuration 
     The block diagrams ( FIG. 14  and  FIG. 15 ) which are used in description of the embodiment illustrate blocks of a function unit. The function blocks (constituent units) are realized by an arbitrary combination of hardware and/or software. In addition, means for realizing respective function blocks is not particularly limited. That is, the respectively function block may be realized by one device in which a plurality of elements are physically and/or logically combined. In addition, two or greater devices, which are physically and/or logically separated from each other, may be directly and/or indirectly (for example, wire and/or wirelessly) connected, and the respective function blocks may be realized by a plurality of the devices. 
     For example, the user equipment  10  and the base station  20  in the embodiment of the invention may function as a computer that performs processing according to the embodiment.  FIG. 16  is a view illustrating an example of a hardware configuration of the user equipment  10  and the base station  20  according to this embodiment. Each of the user equipment  10  and the base station  20  may be configured as a computer device that physically includes a processor  1001 , a memory  1002 , a storage  1003 , a communication device  1004 , an input device  1005 , an output device  1006 , a bus  1007 , and the like. 
     Note that, in the following description, a term “device” may be substituted with a circuit, a device, a unit, and the like. The hardware configuration of the user equipment  10  and the base station  20  may include the respective devices, which are indicated by reference numerals  1001  to  1006  in the drawing, one by one or in a plural number, or may not include a part of the devices. 
     Respective functions in the user equipment  10  and the base station  20  are realized by reading out predetermined software (program) from hardware such as the processor  1001  and the memory  1002  so as to allow the processor  1001  to perform an arithmetic operation, and by controlling a communication by the communication device  1004 , and reading-out and/or input of data in the memory  1002  and the storage  1003 . 
     For example, the processor  1001  allows an operating system to operate so as to control the entirety of the computer. The processor  1001  may be constituted by a central processing unit (CPU) that includes an interface with a peripheral device, a control device, an arithmetic operation device, a register, and the like. 
     In addition, the processor  1001  reads out a program (program code), a software module, or data from the storage  1003  and/or the communication device  1004  into the memory  1002 , and performs various kinds of processing according to the program, the software module, or the data. As the program, a program, which allows the computer to execute at least a part of the operations described in the embodiment, is used. For example, the signal transmission unit  101 , the signal reception unit  102 , the switching control unit  103 , transmission power control unit  104 , and the logical channel priority control unit  105  of the user equipment  10  may be realized by a control program that is stored in the memory  1002  and is operated by the processor  1001 . In addition, the signal transmission unit  201 , the signal reception unit  202 , the priority management unit  203 , and the scheduling unit  204  of the base station  20  may be realized by a control program that is stored in the memory  1002  and is operated by the processor  1001 . The above-described various kinds of processing are described to be executed by one processor  1001 , but may be simultaneously or sequentially executed by two or greater processors  1001 . The processor  1001  may be mounted by one or greater chips. Furthermore, the program may be transmitted from a network through electric communication line. 
     The memory  1002  is a computer-readable recording medium, and may be constituted by, for example, at least one of a read only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), and the like. The memory  1002  may be referred to as a register, a cache, a main memory (main storage device), and the like. The memory  1002  can retain a program (program code), a software module, and the like which can be executed to carry out processing the embodiment of the invention. 
     The storage  1003  is a computer-readable recording medium, and may be constituted by at least one, for example, among an optical disc such as a compact disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disc (for example, a compact disc, a digital multi-purpose disc, and a Blue-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. The storage  1003  may be referred to as an auxiliary storage device. For example, the above-described storage medium may be database including the memory  1002  and/or the storage  1003 , a server, and other appropriate media. 
     The communication device  1004  is hardware (transmission and reception device) that performs a communication between computers through wire and/or radio network, and may be referred to as, for example, a network device, a network controller, a network card, a communication module, and the like. For example, the signal transmission unit  101  and the signal reception unit  102  of the user equipment  10  may be realized by the communication device  1004 . In addition, the signal transmission unit  201  and the signal reception unit  202  of the base station  20  may be realized by the communication device  1004 . 
     The input device  1005  is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device  1006  is an output device (for example, a display, a speaker, an LED lamp, and the like) that performs output to the outside. Furthermore, the input device  1005  and the output device  1006  may have an integral configuration (for example, a touch panel). 
     In addition, respective devices including the processor  1001 , the memory  1002 , and the like are connected to each other through a bus  1007  for an information communication. The bus  1007  may be configured as a single bus, or may be configured as a bus that is different between devices. 
     In addition, the user equipment  10  and the base station  20  may include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), or a part or the entirety of respective function blocks may be realized by the hardware. For example, the processor  1001  may be mounted by at least one piece of hardware. 
     Summary of Embodiments 
     As described above, according to the embodiments, there is provided a user equipment in a radio communication system, the user equipment including: a storage unit that stores configuration information in which priority of data is associated with a carrier or a carrier group; a selection unit that determines priority of transmission data that is transmitted from the user equipment, and selects a carrier or a carrier group that corresponds to the priority that is determined on the basis of the configuration information; and a transmission unit that transmits the transmission data by using the carrier or the carrier group that is selected by the selection unit. 
     According to the configuration, it is possible to provide a technology capable of transmitting data by using an appropriate carrier in a user equipment that performs data transmission by using a plurality of carriers. 
     The user equipment may perform a communication with a plurality of base stations, and the carrier that is selected by the selection unit may be a carrier or a carrier group that is used in a communication with one base station among the plurality of base stations. According to this configuration, for example, in a case where a DC is set to the user equipment, the user equipment can perform transmission by appropriately selecting a carrier. 
     The user equipment may further include a transmission power control unit that preferentially allocates transmission power to data with first priority higher than second priority in comparison to data with the second priority in a case where the transmission unit simultaneously transmits a plurality of pieces of data which are different in priority by using a plurality of carriers. According to this configuration, it is possible to reliably transmit data with high priority. 
     In a case where the sum of required transmission power for the data with the first priority and required transmission power for the data with the second priority exceeds maximum transmission power of the user equipment, the transmission power control unit drops transmission of the data with the second priority or makes transmission power of the data with the second priority smaller than required transmission power. According to this configuration, a method of allocating transmission power with respect to data with low priority becomes clear, and it is possible to realize a stable operation. 
     The user equipment may further include a logical channel priority control unit that divides a plurality of logical channels, which are used in transmission of data from the user equipment, into a plurality of groups to which priority is given, and performs transmission data allocation to a resource capable of being used in the order of priority of the logical channels in each of the groups. According to this configuration, it is possible to realize appropriately perform a transmission priority control between logical channels without excessively raising priority of a specific logical channel similar to the related art. 
     Supplement of Embodiments 
     Information notification may be performed by other methods without limitation to the aspect and the embodiment which are described in this specification. For example, the information notification may be executed by physical layer signaling (for example, downlink control information (DCI) and uplink control information (UCI)), higher layer signaling (for example, RRC signaling, MAC signaling, broadcast information (master information block (MIB), system information block (SIB))), other signals, or a combination thereof. In addition, the RRC message may be referred to as RRC signaling. In addition, for example, the RRC message may be an RRC connection setup message, an RRC connection reconfiguration message, and the like. 
     The aspect and the embodiment which are described in this specification may also be applied to long term evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G, 5G, future radio access (FRA), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, ultra-wideband (UWB), Bluetooth (registered trademark), other systems which use a suitable system, and/or a next generation system that is extended on the basis of the systems. 
     Information that is input or output, and the like may be stored in a specific location (for example, a memory), or may be managed by a management table. The information that is input or output, and the like may be subjected to rewriting, updating, or additional writing. The information, which is output, and the like may be deleted. The information, which is input, and the like may be transmitted to other devices. 
     Decision or determination may be performed by a value (0 or 1) that is expressed by one bit, may be performed in accordance with Boolean (true or false), or may be performed through numerical value comparison (for example, comparison with a predetermined value). 
     The information, the signals, and the like, which are described in this specification, may be expressed by using any one of other various technologies. For example, data, information, a signal, a bit, a symbol, and the like, which are stated over the entirety of the above description, may be expressed by a voltage, a current, an electromagnetic wave, a magnetic field or a magnetic particle, a photo field or a photon, or an arbitrary combination thereof. 
     Note that, terms described in this specification and/or terms necessary for understanding of this specification may be substituted with terms having the same or similar meaning. For example, the channel and/or the symbol may be a signal. In addition, the signal may be a message. 
     The user equipment may be referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or several other suitable terms by those skilled in the art. 
     In the procedure, the sequence, and the like in the aspect and the embodiment which are described in this specification, the order thereof may be changed as long as inconsistency does not occur. For example, with regard to the method that is described in this specification, elements of various steps are suggested in an exemplary order, and there is no limitation to the specific order that is suggested. 
     The aspect and the embodiment which are described in this specification may be used alone or in combination thereof, or may be switched and used in accordance with execution. In addition, notification of predetermined information (for example, notification of “a fact of X”) is not limited to the explicit notification, and may be performed in an implicit manner (for example, notification of the predetermined information is not performed). 
     The term “determining” that is used in this specification may include various operations. For example, the term “determining” may include regarding of calculating, computing, processing, deriving, investigating, looking up (for example, looking up in a table, a database, or other data structures), or ascertaining as “determined”, and the like. In addition, the “determining” may include regarding of receiving (for example, information receiving), transmitting (for example, information transmitting), input, output, or accessing (for example, accessing to data in a memory) as “determined”, and the like. In addition, “determining” may include regarding of resolving, selecting, choosing, establishing, comparing, or the like as “determining”. That is, “determining” includes regarding of any operation as “determined”. 
     Description of “on the basis of” in this specification does not represent “only on the basis of” unless otherwise stated. In other words, description of “on the basis of” represents both “only on the basis of” and “at least on the basis of”. 
     Hereinbefore, the invention has been described in detail, but it is apparent by those skilled in the art that the invention is not limited to the above-described embodiment in this specification. The invention can be executed a variation aspect and a modification aspect without departing from the gist or the scope of the invention which is determined by description of the appended claims. Accordingly, description in this specification is made for exemplary explanation, and does not have any limiting meaning with respect to the invention. 
     The present patent application claims priority based on Japanese patent application No. 2016-158266, filed in the JPO on Aug. 10, 2016, and the entire contents of the Japanese patent application No. 2016-158266 are incorporated herein by reference. 
     EXPLANATIONS OF LETTERS OR NUMERALS 
       10 ,  40  User equipment 
       20 ,  30  Base station 
       101  Signal transmission unit 
       102  Signal reception unit 
       103  Switching control unit 
       104  Transmission power control unit 
       105  Logical channel priority control unit 
       201  Signal transmission unit 
       202  Signal reception unit 
       203  Priority management unit 
       204  Scheduling unit 
       1001  Processor 
       1002  Memory 
       1003  Storage 
       1004  Communication device 
       1005  Input device 
       1006  Output device