JP2016127383A - User device, base station, mobile communication system, and function use control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the use instruction of a predetermined function from a base station on the basis of the use propriety of the predetermined function in a user device.SOLUTION: A user device which communicates with a base station in a mobile communication system includes: flag setting means for determining whether or not a predetermined function is available in the user device, and for, when the predetermined function is available, setting a first value in a use propriety flag, and for, when the predetermined function is unavailable, setting a second value in the use propriety flag; and notification means for, when the value of the use propriety flag is changed by the flag setting means, notifying the base station that the value of the use propriety flag has been changed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a user apparatus UE and a base station eNB in a mobile communication system that supports carrier aggregation.

  The LTE system employs carrier aggregation (CA) that performs communication using a plurality of carriers simultaneously with a predetermined bandwidth (maximum 20 MHz) as a basic unit (Non-patent Document 1). A carrier that is a basic unit in carrier aggregation is called a component carrier (CC).

  When CA is performed, a PCell (Primary cell) that is a highly reliable cell that ensures connectivity and a SCell (Secondary cell) that is an ancillary cell are set for the user apparatus UE. First, the user apparatus UE can connect to the PCell and add an SCell as necessary. The PCell is a cell similar to a single cell that supports RLM (Radio Link Monitoring), SPS (Semi-Persistent Scheduling), and the like.

  The SCell is a cell that is added to the PCell and set for the user apparatus UE. The addition and deletion of the SCell is performed by RRC (Radio Resource Control) signaling (Non-Patent Document 2). Immediately after being set for the user apparatus UE, the SCell is a cell that is in an inactive state (deactivated state), and thus can be communicated (schedulable) only when activated. Activation / deactivation is performed by a MAC signal (MAC control element) (Non-Patent Document 3).

  That is, CA has three states: SCell de-configured state (Scell deletion state), SCell de-activated state (SCell stopped state), and SCell activated state (SCell communication state).

  In the SCell de-configured state, communication by one cell (CC) is performed. In the SCell de-activated state, only the upper layer (RRC layer) is in the CA state, but the SCell is disconnected in the lower layer. In the SCell activated state, the lower layer is also in the CA state, and is actually in a state where communication can be performed using the CA.

3GPP TS 36.300 V12.1.0 (2014-03) 3GPP TS 36.331 V12.2.0 (2014-06) 3GPP TS 36.321 V12.3.0 (2014-09)

  In the current 3GPP standard specifications, as described above, the activation (activation) of the SCell is based on the signal level of the corresponding cell in the user apparatus UE, for example, based on the activation instruction (indicated by the MAC signal from the base station eNB to the user apparatus UE). Hereinafter, it is referred to as CA activation instruction).

  However, since the user apparatus UE cannot reject the CA activation instruction from the base station eNB, even if a problem that may affect the CA performance occurs on the user apparatus UE side, the CA activation instruction is performed, and excessively There are cases where resources are reserved. Such a problem is not limited to CA, and may generally occur when the user apparatus UE uses a predetermined function based on an instruction from the base station eNB to the user apparatus UE.

  The present invention has been made in view of the above-described points, and provides a technique that makes it possible to control an instruction to use a predetermined function from a base station based on availability of the predetermined function in a user apparatus. The purpose is to provide.

According to an embodiment of the present invention, a user apparatus that communicates with a base station in a mobile communication system,
It is determined whether or not a predetermined function can be used in the user device, and when the predetermined function is usable, a first value is set in an availability flag and the predetermined function cannot be used. A flag setting means for setting a second value in the availability flag;
There is provided a user apparatus comprising reporting means for reporting to the base station that the value of the availability flag is changed when the value of the availability flag is changed by the flag setting means.

Further, according to the embodiment of the present invention, a base station that communicates with a user apparatus in a mobile communication system,
When a report indicating that a predetermined function is usable in the user device is received from the user device, a first value is set in an availability flag, and the predetermined function is not usable in the user device. Flag setting means for setting a second value in the availability flag when a report indicating that the user apparatus is received from the user device;
A base station comprising: control means for executing control for not transmitting a use instruction for the predetermined function to the user apparatus when the value of the availability flag set by the flag setting means is the second value Is provided.

Moreover, according to the embodiment of the present invention, a mobile communication system comprising a user apparatus and a base station,
The user equipment is
It is determined whether or not a predetermined function can be used in the user device, and when the predetermined function is usable, a first value is set in an availability flag and the predetermined function cannot be used. A flag setting means for setting a second value in the availability flag;
Reporting means for reporting to the base station that the value of the availability flag has been changed when the value of the availability flag is changed by the flag setting means,
When the base station receives a report from the user apparatus that the value of the availability flag has been changed from the first value to the second value, the base station gives an instruction to use the predetermined function. A mobile communication system is provided that includes control means for executing control that is not transmitted to a user apparatus.

Moreover, according to the embodiment of the present invention, there is provided a function usage control method executed by a user apparatus that communicates with a base station in a mobile communication system,
It is determined whether or not a predetermined function can be used in the user device, and when the predetermined function is usable, a first value is set in an availability flag and the predetermined function cannot be used. A flag setting step of setting a second value in the availability flag;
When the value of the availability flag is changed by the flag setting step, there is provided a function usage control method including a reporting step of reporting to the base station that the value of the availability flag has been changed.

Moreover, according to the embodiment of the present invention, a function usage control method executed by a base station that communicates with a user apparatus in a mobile communication system,
When a report indicating that a predetermined function is usable in the user device is received from the user device, a first value is set in an availability flag, and the predetermined function is not usable in the user device. A flag setting step of setting a second value in the availability flag when a report indicating that the user apparatus is received from the user device;
A function use comprising: a control step for executing a control not to send a use instruction for the predetermined function to the user device when the value of the availability flag set in the flag setting step is the second value A control method is provided.

  According to the embodiment of the present invention, there is provided a technique that can control the use instruction of a predetermined function from the base station based on whether or not the predetermined function can be used in the user apparatus.

It is a block diagram of the communication system which concerns on embodiment of this invention. It is a sequence diagram for demonstrating the example of a basic process regarding activation / deactivation of SCell. It is a figure for demonstrating operation | movement of the user apparatus UE which concerns on the setting of the flag which shows CA use availability. It is a figure for demonstrating operation | movement of the base station eNB which concerns on the setting of the flag which shows CA use availability. It is a figure which shows the example of the state transition of the flag between the user apparatus UE and the base station eNB. It is a figure which shows the example of a sequence for aiming at the synchronization of flag setting. It is a figure for demonstrating the signaling for the user apparatus UE to refuse the activation instruction | indication from the base station eNB. It is a flowchart which shows the operation | movement in the user apparatus UE regarding the sequence shown in FIG. It is a block diagram of the user apparatus UE. It is a block diagram of the base station eNB.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment. Further, although the present embodiment is directed to an LTE mobile communication system, the present invention is not limited to LTE and can be applied to other mobile communication systems. Further, in the present embodiment, the Rel (release number) in the case where “LTE” is described may be any Rel as long as it is a Rel for which carrier aggregation (CA) is defined.

  In the following embodiment, for convenience of explanation, the number of SCells in CA is one (one downlink CC or one set of one downlink CC and one uplink CC), but the present invention is not limited to the number of SCells. Applicable.

(Overall system configuration, operation overview)
FIG. 1 shows a configuration diagram of a communication system according to an embodiment of the present invention. As shown in FIG. 1, the communication system in the present embodiment is a mobile communication system including a base station eNB and a user apparatus UE. CA communication can be performed between the base station eNB and the user apparatus UE. In FIG. 1, one base station eNB and one user apparatus UE are shown, but this is for the convenience of illustration, and there may be a plurality of each.

  In addition, although one cell is shown in the example of FIG. 1, this is also for convenience of illustration, and there are a plurality of cells when CA is set. Further, for example, a configuration may be provided in which a remote radio head (RRH) connected to the base station eNB by an optical fiber or the like is provided at a location away from the base station eNB.

(Processing sequence example)
Next, a basic processing example regarding activation / deactivation of the SCell in the communication system shown in FIG. 1 will be described with reference to the sequence diagram of FIG.

  First, it is assumed that the state is a non-CA state. The base station eNB instructs the quality measurement of the neighboring cell to the user apparatus UE by Measurement configuration (Step 101). The user apparatus UE performs measurement (step 102), and returns a measurement result (Measurement Report) to the base station eNB (step 103).

  The base station eNB determines to set CA based on the measurement result received from the user apparatus UE, and instructs the addition of the SCell by RRC connection Reconfiguration (step 104). Thereby, the user apparatus UE performs the setting which adds SCell, and the user apparatus UE / base station eNB will be in a CA state. However, at this time, the SCell is in an inactive state. In step 105, the user apparatus UE receives the CA activation instruction by the MAC control element from the base station eNB to activate the SCell, and performs the CA communication using the PCell and the SCell.

  The SCell is deactivated by a CA deactivation instruction from the base station eNB, and also deactivated when a predetermined period elapses without communication by the SCell, that is, when a predetermined timer expires (step). 106). The value of the timer is notified from the base station eNB as an sCellDeactivationTimer when, for example, the SCell addition instruction in Step 104 is performed.

  Thereafter, for example, when the base station eNB needs to transmit a large amount of data for the user apparatus UE, the base station eNB activates the SCell by transmitting a CA activation instruction (step 107). In addition, the base station eNB transmits a CA deactivation instruction to the user apparatus UE, for example, based on a situation such as a decrease in the reception level of the SCell or a congestion of the SCell. (Step 108).

(Introduction of CA availability flag)
As already explained, in the prior art, when the user apparatus UE receives the CA activation instruction, it cannot refuse it, and communication by the SCell is sufficiently performed due to a partial failure or the like of the user apparatus UE. Even if it is not possible, the user apparatus UE activates the SCell and performs CA communication using the PCell and the SCell. However, if communication by SCell cannot be performed sufficiently, battery power is wasted due to receiver tuning to multiple CCs, etc., even though performance does not improve compared to communication by one cell (PCell). Or use of network resources (wireless capacity) wastefully.

  So, in this Embodiment, the flag (flag) which shows whether the said user apparatus UE is in the state which can use CA for each of the user apparatus UE side and the base station eNB side is introduced, and the user apparatus UE uses CA. The CA activation instruction from the base station eNB is not performed when the incapable state exists.

  More specifically, in the present embodiment, a flag A (0 or 1) indicating whether CA can be used is set on the user apparatus UE side. Although the value of the flag A may be determined to any value, in the present embodiment, when the user apparatus UE enters a state where the CA can be used, the user apparatus UE autonomously sets the flag A to 0. To do. The flag A = 0 is set as a default value. Further, when the user apparatus UE becomes in a state where CA cannot be used, the user apparatus UE autonomously sets the flag A to 1.

  In the present embodiment, the “state in which CA can be used” (CA usable state) means that the user apparatus UE can perform CA communication using PCell and SCell as usual. At this time, even when the performance is reduced due to the user apparatus UE, the state may be “a state where the CA can be used” when the degree of the reduction is small (eg, smaller than a predetermined threshold).

  In addition, the “state in which CA cannot be used” (state in which CA cannot be used) refers to a state in which communication with the SCell cannot be performed at all due to a failure of the user apparatus UE or the like, and communication performance with the SCell is greatly reduced as compared with normal operation. It is a state to do.

  In the base station eNB, a flag B (0 or 1) indicating whether or not the corresponding user apparatus UE can use CA is set. That is, the base station eNB sets the flag B to 0 based on the report from the user apparatus UE when the user apparatus UE is in a state where CA can be used. The flag B = 0 is set as a default value. Moreover, the base station eNB sets the flag B to 1 based on the report from the user apparatus UE when the user apparatus UE enters a state where the CA cannot be used.

<Example of device operation related to flag setting>
With reference to FIG. 3, the example of flag A setting operation | movement in the user apparatus UE is demonstrated. The operation shown in FIG. 3 is performed periodically, for example. In this example, when the CA is set (that is, when the SCell is configured), the operation related to the flag A setting is performed. Therefore, in step 201, it is determined whether the CA is set. judge. If the CA setting has not been made (No in step 201), the process is terminated.

  When the CA setting is made (Yes in Step 201), the user apparatus UE determines whether or not the user apparatus UE can use the CA (Step 202).

  A method for determining whether or not the user apparatus UE can use CA is not limited to a specific method. For example, the user apparatus UE stores “CA unavailable” information in a storage unit such as a memory when performance such as a data transfer rate is equal to or lower than a predetermined value when performing CA communication recently. Further, it may be determined whether or not the CA can be used based on the presence or absence of this information, and the user apparatus UE has a hardware and / or software failure determination function, and operates the failure determination function, so that “CA Whether or not the CA can be used may be determined based on whether or not a failure corresponding to “unusable” has occurred, or may be determined by other methods.

  When the determination result in step 202 is Yes (CA available), the process proceeds to step 203, and the user apparatus UE sets the flag A to 0. Note that “set to 0” includes leaving 0 when it is already 0.

  When the determination result in step 202 is No (CA cannot be used), the process proceeds to step 204 where the user apparatus UE sets the flag A to 1. Note that “setting to 1” includes leaving 1 when it is already 1.

  Next, an example of flag B setting operation in the base station eNB will be described with reference to FIG. The operation shown in FIG. 4 is performed, for example, periodically for each connected user device. In this example, since the operation related to the flag B setting is performed when the CA is set (that is, when the SCell is configured for the user apparatus UE), in step 301, attention is paid. It is determined whether or not the CA setting has been made for the user apparatus UE being connected. If CA setting has not been made (No in step 301), the process is terminated.

  When the CA setting is made (Yes in Step 301), the base station eNB determines whether or not the user apparatus UE can use the CA (Step 302).

  In the present embodiment, the base station eNB determines whether or not the CA can be used in the user apparatus UE based on the report on the value change of the flag A from the user apparatus UE. That is, if a report indicating that the flag A = 1 has not been received from the user apparatus UE, it is determined that the CA can be used. If a report indicating that the flag A = 1 has been received, the CA cannot be used. It is determined that However, this determination method is an example, and the determination may be performed by other methods.

  If the determination result in step 302 is Yes (CA available), the process proceeds to step 303, and the base station eNB sets the flag B to 0. Note that “set to 0” includes leaving 0 when it is already 0.

  When the determination result in Step 302 is No (CA cannot be used), the process proceeds to Step 304 and the base station eNB sets the flag B to 1. Note that “setting to 1” includes leaving 1 when it is already 1.

  The operation related to the flag B setting of the base station eNB is an example. In addition to the above example, for example, the flag B may be set (synchronized with the flag A) using a report reception of the change of the flag A from the user apparatus UE as a trigger. That is, in this case, the base station eNB sets the flag B = 1 when receiving the change report to the flag A = 1, and then sets the flag B = 0 when receiving the change report to the flag A = 0. .

  When the flag B is set to 1 in the base station eNB, even if the signal level of the SCell has reached the standard in which the CA can be used in the user apparatus UE, the base station eNB performs CA for the user apparatus UE. Do not prompt for activation.

<Example of flag state transition>
FIG. 5 is a diagram illustrating an example of flag state transition between the user apparatus UE and the base station eNB. In the example shown in FIG. 5, since the user apparatus UE can use the CA in the period shown in step 401, the flag A = 0 and the flag B = 0, and the base station eNB can transmit the CA activation instruction.

  In the period shown in step 402, since the user apparatus UE cannot use the CA, the flag A = 1 and basically the flag B = 1. When the flag B = 1, the base station eNB cannot transmit the CA activate instruction.

  In the period shown in step 403, since the user apparatus UE can use the CA, the flag A = 0 and basically the flag B = 0. When the flag B = 0, the base station eNB can transmit a CA activate instruction.

  Since the base station eNB basically sets the flag B based on the report from the user apparatus UE, the base station eNB matches the flag A and the flag B as shown in AB and CD of FIG. 5 ( Although there will be a time lag when synchronizing), there will be little problem due to time lag because it synchronizes as quickly as possible.

<Example sequence for synchronizing flag settings>
FIG. 6 shows a sequence example for synchronizing the flag settings. In this example, the change of the flag A is reported from the user apparatus UE to the base station eNB.

  When the user apparatus UE is in a CA available state (step 501) and the base station eNB is in a CA activate instruction available state (step 601), the user apparatus UE transitions to a CA unavailable state (step 502). . With the transition to the CA unusable state, the user apparatus UE reports to the base station eNB that the flag A = 1 (step 503), and sets the flag A = 1 (step 504). Note that setting the flag A = 1 in the user apparatus UE corresponds to storing the flag A = 1 in a storage unit such as a memory.

  The base station eNB that has received the report that the flag A = 1 is set (step 602), and transitions to a CA activation instruction disabled state (step 603). Note that setting the flag B = 1 in the base station eNB corresponds to storing the flag B = 1 in a storage unit such as a memory.

  Thereafter, when the user apparatus UE returns to the CA usable state (step 505), the user apparatus UE sets the flag A = 0 (step 506) and reports to the base station eNB that the flag A = 0. (Step 507). The base station eNB that has received the report that the flag A = 0 is set by setting the flag B = 0 (step 604), thereby transitioning to a CA activation instruction enabled state (step 605).

  As described above, by introducing a flag about whether or not the CA can be used, in the state where the user apparatus UE cannot appropriately perform CA, the CA activation instruction is not performed from the base station eNB, and the problem of the conventional technology can be solved. For example, the wireless capacity can be effectively used.

(Modification)
However, for example, as illustrated in AB of FIG. 5, when a period of flag state mismatch between the user apparatus UE and the base station eNB occurs, there is a problem that the CA cannot be used on the user apparatus UE side. Nevertheless, it is conceivable that the CA activate instruction is transmitted from the base station eNB to the user apparatus UE.

  Therefore, in a modification, when the flag A in the user apparatus UE is 1 (CA unavailable state), when the user apparatus UE receives a CA activate instruction from the base station eNB, the user apparatus UE gives the instruction. Signaling (SigA) indicating rejection is notified to the base station eNB. This signaling signal may be transmitted using MAC CE or may be transmitted as a lower layer PHY signal.

  With reference to FIG. 7, the example of the said signaling in a modification is demonstrated. FIG. 7A shows an example in which the flag A = 0 (CA can be used). In this case, when receiving the CA activation instruction from the base station eNB (step 701), the user apparatus UE returns ACK and performs CA activation processing (steps 702 and 703).

  On the other hand, FIG. 7B shows an example in the case of flag A = 1 (CA cannot be used). In this case, when receiving the CA activation instruction from the base station eNB (step 801), the user apparatus UE transmits a signal indicating CA rejection to the base station eNB (step 802). The CA activation process is not performed. Note that the base station eNB that has received the signal indicating CA rejection has received the CA activation instruction to the user apparatus UE, but can recognize that the CA activation has been rejected.

  FIG. 8 is a flowchart showing an operation in the user apparatus UE regarding the sequence shown in FIG. When receiving the activation instruction from the base station eNB (step 901), the user apparatus UE determines whether or not the flag A = 0 (step 902).

  When the flag A = 0 (Yes in Step 902, when CA is available), the user apparatus UE executes CA activation processing (Step 903). When the flag A is 1 (No in Step 902, when CA is not available), the user apparatus UE transmits a CA rejection signal to the base station eNB (Step 904).

(Device configuration)
Hereinafter, configuration examples of the user apparatus UE and the base station eNB in the present embodiment will be shown.

<User device UE>
FIG. 9 shows a functional configuration diagram of the user apparatus UE in the present embodiment. As illustrated in FIG. 9, the user apparatus UE according to the present embodiment includes a DL signal reception unit 101, a UL signal transmission unit 102, a flag setting management unit 103, and a CA control unit 104. Note that FIG. 9 shows only functional units that are particularly related to the embodiment of the present invention in the user apparatus UE, and the user apparatus UE operates as a user apparatus UE in a mobile communication system that conforms to at least LTE. It also has a function (not shown). The functional configuration shown in FIG. 9 is only an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  The DL signal receiving unit 101 includes a function of wirelessly receiving various signals from the base station eNB and acquiring a higher layer signal from the received physical layer signal. The UL signal transmission unit 102 includes a function of generating and wirelessly transmitting various physical layer signals from higher layer signals to be transmitted from the user apparatus UE. The DL signal receiving unit 101 and the UL signal transmitting unit 102 are configured to perform CA communication.

  The flag setting management unit 103 includes a function for determining whether or not the CA can be used, and performs flag setting / management and reporting processing described with reference to FIGS. The flag setting management unit 103 includes a storage unit such as a memory and holds the value of the flag A.

  The CA control unit 104 performs management, addition, deletion, activation, deactivation, etc. of the cells (CC) constituting the CA, and has been described with reference to FIG. 7 based on the flag A managed by the flag setting management unit 103. As described above, the CA activation process is executed or the CA rejection signal is transmitted.

<Base station eNB>
FIG. 10 shows a functional configuration diagram of the base station eNB in the present embodiment. As illustrated in FIG. 10, the base station eNB includes a DL signal transmission unit 201, a UL signal reception unit 202, a flag setting management unit 203, and a CA control unit 204. Note that FIG. 10 shows only functional units particularly related to the embodiment of the present invention in the base station eNB, and the base station eNB is for operating as a base station in a mobile communication system compliant with at least LTE. It also has a function not shown. Further, the functional configuration shown in FIG. 10 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  The DL signal transmission unit 201 includes a function of generating and wirelessly transmitting various physical layer signals from higher layer signals to be transmitted from the base station eNB. The UL signal reception unit 202 includes a function of wirelessly receiving various signals from the user apparatus UE and acquiring a higher layer signal from the received physical layer signal. The DL signal transmission unit 201 and the UL signal reception unit 202 are configured to perform CA communication.

  The flag setting management unit 203 performs processing such as flag setting / management described with reference to FIGS. The flag setting management unit 103 includes a storage unit such as a memory and holds the value of the flag B. The CA control unit 204 performs CA-related control such as CA setting (SCell addition) instruction, CA management, and CA activation instruction to the user apparatus UE. In addition, when the flag B managed by the flag setting management unit 203 is 1, the CA control unit 204 performs control not to execute the CA activation instruction for the user apparatus UE.

(Other examples)
In the example described so far, the case where one SCell is added has been taken as an example. However, even when a plurality of SCells are added, the same control as described above can be performed. In this case, for example, it is possible to determine availability / impossibility for the entire group of a plurality of SCells, and to set the flag A / flag B. Alternatively, it is possible to determine whether each SCell can be used or not, and set flag A / flag B. When targeting individual SCells, for example, flag A / flag B is a bit string, and flag A / flag B for an SCell with an index i (i is an integer of 1 or more) is the i-th bit (0 or 1). It can be.

  In addition, a control method using a flag based on availability of CA can be applied to other services (functions) other than CA.

  For example, the control method can be applied to Dual Connectivity (hereinafter referred to as DC). The DC performs simultaneous communication using CCs under different base stations eNB to achieve high throughput, and the user apparatus UE communicates using radio resources of two physically different base stations eNB at the same time. I do. DC is also called Inter eNB CA (carrier aggregation between base stations), and Master-eNB (MeNB) and Secondary-eNB (SeNB) are introduced. In DC, a cell group composed of cells (one or more) under the MeNB is defined as a MCG (Master Cell Group), and a cell group composed of cells (one or a plurality) under the SeNB is defined as SCG ( (Secondary Cell Group, secondary cell group).

  In DC, for example, “CA setting” described so far is replaced with “DC setting”, and “adding SCell” is replaced with “adding SCG”, so that the control method described so far is applied. it can. That is, when DC use is disabled in the user apparatus UE, the flag A = 1 is notified to the base station (MeNB), and the base station (MeNB) that receives this sets the flag B = 1, and the user apparatus UE It is possible to prevent activation of SCG.

  Further, for example, the control method can be applied to FeICIC. FeICIC is a further extension of eICIC (enhanced Inter-Cell Interference Coordination) in a HetNet environment, and interference is achieved by canceling a cell-specific reference signal (CRS) from a macro cell in a user apparatus UE connected to a small cell. It is intended to reduce power consumption. In FeICIC, the CRS canceller operation on the user apparatus UE side is assumed, and the above control method can be applied when there is no room for operating the canceller in the user apparatus UE.

  That is, for example, when the CRS canceller cannot be used in the user apparatus UE, the flag A = 1 is notified to the base station eNB (e.g., macro base station), and the base station eNB that has received the flag A = 1 sets the flag B = 1. For example, the user apparatus UE can be controlled not to be located in the small cell so that the CRS canceller operation is unnecessary. That is, control is performed such that a handover instruction to a small cell corresponding to the CRS canceller usage instruction is not performed. As an operation corresponding to the above-described modified example, for example, when the user apparatus UE is in a state where the CRS canceller cannot be used, when the handover instruction from the macro cell to the small cell is received from the base station eNB, the instruction is rejected. To transmit to the base station eNB.

  As described above, since the control method according to the present embodiment can be applied to various services, a flag for each service may be introduced on the user apparatus UE side / base station eNB side. For example, CA flag A_CA (0 or 1), flag B_CA (0 or 1), DC flag A_DC (0 or 1), flag B_DC (0 or 1), FeICIC flag A_FeICIC (0 or 1) , Flag B_FeICIC (0 or 1) or the like can be introduced. When using each service as described above, in the configuration of the user apparatus UE and the base station eNB, the CA control units 104 and 204 include functions corresponding to the service.

  As described above, according to the present embodiment, a user apparatus that communicates with a base station in a mobile communication system, and determines whether or not a predetermined function is available in the user apparatus. Flag setting means for setting a first value in the availability flag when the function is available and setting a second value in the availability flag when the predetermined function is unavailable When the value of the availability flag is changed by the flag setting means, there is provided a user apparatus comprising reporting means for reporting to the base station that the value of the availability flag has been changed.

  With the above configuration, since reporting to the base station is performed based on the availability of the predetermined function in the user apparatus, it is possible to control the use instruction of the predetermined function from the base station.

  When the user apparatus receives a usage instruction for the predetermined function from the base station in a state where the value of the availability flag set by the flag setting unit is the second value, the usage instruction Control means for transmitting to the base station a signal indicating that refusal is rejected may be provided. With this configuration, even when a period in which the value of the availability flag is not synchronized between the user apparatus and the base station occurs, if the user apparatus cannot use the predetermined function, the predetermined function It is possible to avoid performing operations that use.

  The predetermined function is, for example, carrier aggregation, dual connectivity, or a reference signal canceller. Thus, the control method according to the present embodiment can be applied to various functions.

  Further, according to the present embodiment, when a base station that communicates with a user apparatus in a mobile communication system and receives a report from the user apparatus indicating that a predetermined function is available in the user apparatus, A first value is set in the availability flag, and a second value is set in the availability flag when a report indicating that the predetermined function is unavailable in the user device is received from the user device. And a control for executing a control not to transmit a usage instruction for the predetermined function to the user device when a value of the availability flag set by the flag setting unit is the second value. A base station comprising means is provided.

  With the above configuration, it is possible to control the use instruction of the predetermined function from the base station based on the availability of the predetermined function in the user apparatus.

  Further, according to the present embodiment, a mobile communication system including a user apparatus and a base station, wherein the user apparatus determines whether or not a predetermined function is available in the user apparatus, and the predetermined apparatus Flag setting means for setting a first value in an availability flag when a function is available, and setting a second value in the availability flag when the predetermined function is unavailable; Reporting means for reporting to the base station that the value of the availability flag has been changed when the value of the availability flag is changed by the flag setting means; Control that does not transmit an instruction to use the predetermined function to the user device when a report is received from the device that the value of the availability flag has been changed from the first value to the second value. Run Mobile communication system comprising a control means is provided.

  With the above configuration, it is possible to control the use instruction of the predetermined function from the base station based on the availability of the predetermined function in the user apparatus.

  The user apparatus UE described in the present embodiment may be configured to include a CPU and a memory and be executed by a program being executed by a CPU (processor), or the processing described in the present embodiment. The configuration may be realized by hardware such as a hardware circuit provided with logic, or a program and hardware may be mixed.

  The base station eNB described in the present embodiment may include a CPU and a memory, and may be realized by a program being executed by a CPU (processor). The processing described in the present embodiment The configuration may be realized by hardware such as a hardware circuit provided with logic, or a program and hardware may be mixed.

  Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. For convenience of explanation, the base station eNB and the user apparatus UE have been described using functional block diagrams, but such an apparatus may be realized by hardware, software, or a combination thereof. The software operated by the processor of the user apparatus UE according to the embodiment of the present invention and the software operated by the processor of the base station eNB are respectively a random access memory (RAM), a flash memory, a read-only memory (ROM), It may be stored in any appropriate storage medium such as EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, and the like.

  The present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from the spirit of the present invention.

eNB base station UE user apparatus 101 DL signal reception unit 102 UL signal transmission unit 103 flag setting management unit 104 CA control unit 201 DL signal transmission unit 202 UL signal reception unit 203 flag setting management unit 204 CA control unit

Claims (8)

A user apparatus that communicates with a base station in a mobile communication system,
It is determined whether or not a predetermined function can be used in the user device, and when the predetermined function is usable, a first value is set in an availability flag and the predetermined function cannot be used. A flag setting means for setting a second value in the availability flag;
And a reporting unit that reports to the base station that the value of the availability flag has been changed when the value of the availability flag is changed by the flag setting unit. In a state where the value of the availability flag set by the flag setting means is the second value, when the usage instruction for the predetermined function is received from the base station, the usage instruction is rejected. The user apparatus according to claim 1, further comprising: a control unit that transmits a signal to the base station. The user apparatus according to claim 1, wherein the predetermined function is carrier aggregation, dual connectivity, or a reference signal canceller. A base station that communicates with a user apparatus in a mobile communication system,
When a report indicating that a predetermined function is usable in the user device is received from the user device, a first value is set in an availability flag, and the predetermined function is not usable in the user device. Flag setting means for setting a second value in the availability flag when a report indicating that the user apparatus is received from the user device;
A base station comprising: control means for executing control not to transmit a use instruction for the predetermined function to the user apparatus when the value of the availability flag set by the flag setting means is the second value . The base station according to claim 4, wherein the predetermined function is carrier aggregation, dual connectivity, or a reference signal canceller. A mobile communication system comprising a user equipment and a base station,
The user equipment is
It is determined whether or not a predetermined function can be used in the user device, and when the predetermined function is usable, a first value is set in an availability flag and the predetermined function cannot be used. A flag setting means for setting a second value in the availability flag;
Reporting means for reporting to the base station that the value of the availability flag has been changed when the value of the availability flag is changed by the flag setting means,
When the base station receives a report from the user apparatus that the value of the availability flag has been changed from the first value to the second value, the base station gives an instruction to use the predetermined function. A mobile communication system comprising control means for executing control that is not transmitted to a user apparatus. A function usage control method executed by a user apparatus that communicates with a base station in a mobile communication system,
It is determined whether or not a predetermined function can be used in the user device, and when the predetermined function is usable, a first value is set in an availability flag and the predetermined function cannot be used. A flag setting step of setting a second value in the availability flag;
And a reporting step of reporting to the base station that the value of the availability flag has been changed when the value of the availability flag is changed in the flag setting step. A function usage control method executed by a base station that communicates with a user apparatus in a mobile communication system,
When a report indicating that a predetermined function is usable in the user device is received from the user device, a first value is set in an availability flag, and the predetermined function is not usable in the user device. A flag setting step of setting a second value in the availability flag when a report indicating that the user apparatus is received from the user device;
A function use comprising: a control step of executing a control not to transmit a use instruction for the predetermined function to the user device when the value of the availability flag set in the flag setting step is the second value. Control method.

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