JP2016149732A - User device and uplink control information transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique to enable a base station to early start uplink scheduling for a secondary cell, when the secondary cell capable of transmitting uplink control information is set to a user device.SOLUTION: In a mobile communication system supporting carrier aggregation which includes a secondary cell capable of transmitting uplink control information and a primary cell, a user device performing communication with a base station includes: a determination unit which, after receiving from the base station an activation instruction to the secondary cell, determines an uplink control information type in the secondary cell; and a transmitter unit which, when the uplink control information is determined to be channel state information, transmits the channel state information through the primary cell, and when the uplink control information is determined to be acknowledgement information, transmits the acknowledgement information through the secondary cell.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an uplink communication method of a user apparatus in a mobile communication system such as LTE.

  First, carrier aggregation will be described as background art. The LTE system employs carrier aggregation (CA) that performs communication using a plurality of carriers simultaneously with a predetermined bandwidth 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 addition and deletion of the SCell is performed by RRC (Radio Resource Control) signaling. 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.

  Timing Advance (TA) control will be described as the next background art. On the base station eNB side, FFT processing is collectively performed on the uplink (UL) signals transmitted from the plurality of user apparatuses UE, and demodulation processing is performed.

  However, since the propagation delay in each user apparatus UE differs depending on the location and moving speed of the user apparatus UE, if each user apparatus UE performs UL transmission at the DL reception timing, the UL reception timing in the base station eNB is not uniform and desired. FFT processing cannot be performed at this timing. For example, in the example in which UE1 and UE2 perform UL transmission as shown in FIG. 1, when UE1 and UE2 perform UL transmission at the same timing as shown in FIG. 2, the DL reception timing on the base station eNB side is shifted. Thus, interference between users occurs.

  Thus, in LTE, Timing Advance (TA) control is adopted to absorb the propagation delay difference of each UE and match the UL signal reception timing. Specifically, an adjustment value for each UE is instructed from the base station eNB and the UL transmission timing is adjusted so that the reception timing of the UL signal from each UE is aligned in the base station eNB. As a result of such adjustment, for example, as shown in FIG. 3, the UL transmission timing is earlier in UE 2 that is far from the base station eNB than in UE 1.

  Next, as a background art, Multiple Timing Advances (MTA) will be described. When performing UL CA with different frequency cells (Inter-band CA), the radio characteristics (delay characteristics and attenuation characteristics) are different for each cell. It is necessary to perform TA control. Therefore, in LTE-advanced (Rel-11), when Inter-band CA is performed, PCell and SCell are grouped into groups having the same wireless characteristics (Timing Advance group: TAG) and TA control is performed on each group. Has been introduced. FIG. 4 shows an example of TAG. In the example of FIG. 4, PCell and SCell in band A are grouped as TAG # A, and two SCells in band B are grouped as TAG # B. Note that a TAG including a PCell is referred to as a pTAG (primary TAG), and a TAG including only SCells is referred to as an sTAG (secondary TAG).

  In MTA control, TAG and SCell mapping (including changes) is performed in the RRC layer. Moreover, the cell group (PCell / SCell) in the TAG shares the TA value (UL transmission timing), the value of Time Alignment Timer (value of the TA timer), and the DL timing reference cell. The TA timer is a timer for determining whether the UE is UL synchronous or asynchronous, and it can be determined that UL synchronization is in progress while the TA timer is activated. The DL timing reference cell is a cell that the UE refers to in order to determine the UL transmission timing, and determines the UL transmission timing based on the DL reception timing of the cell.

3GPP TS 36.300 V12.4.0 (2014-12) 3GPP TS 36.321 V12.4.0 (2014-12) 3GPP TS 36.331 V12.4.1 (2014-12)

  User equipment UE in LTE uses PUCCH (Physical Uplink Control Channel: physical uplink control channel) to perform uplink control of ACK / NACK (delivery confirmation information) for PDSCH, downlink reception quality, etc. (CSI: channel state information). Information (UCI: Uplink Control Information) is transmitted. As shown in FIG. 5 (a), in CA up to Rel-12, the user apparatus UE can only transmit PUCCH in PCell, but as shown in FIG. 5 (b), Rel-13 However, it has been studied that PUCCH can be transmitted even in SCell.

  As described above, in the CA, the user apparatus UE activates the SCell after receiving the activation command (Activate command), but the period until the SCell activation is actually completed (actually). The period until signal transmission / reception in the SCell is possible may vary depending on the implementation of the user apparatus UE.

  In CA up to Rel-12, since the PUCCH can be transmitted only by the PCell, the base station eNB receives a report of the SCell's CSI (CQI, etc.) by the UL of the PCell. Therefore, the base station eNB can detect that the user apparatus UE has activated the SCell by observing the CQI value for SCell reported from the user apparatus UE. A more specific procedure example is shown in FIG. In the example of FIG. 6A, SCell included in sTAG is shown as SCell. In step 1, SCell setting is performed. The user apparatus UE receives the SCell activation command in the PCell (step 2). In response to the activation command, the user apparatus UE starts the SCell activation process. In step 3, since the activation of the SCell has not been completed, the user apparatus UE cannot perform normal reception at the SCell, and OOR (Out Of Range) is returned to the base station eNB as the CQI of the SCell. It is.

  Since the activation of the SCell in the user apparatus UE is completed in Step 4 and reception in the SCell can be normally performed, the CQI of a valid SCell is returned (Step 5). Thereby, the base station eNB detects activation of the SCell in the user apparatus UE, and transmits a PDCCH order instructing the RA procedure (random access procedure) to the user apparatus UE using the SCell (step 6). Thereby, the RA procedure for SCell is executed (step 7). Since the user apparatus UE acquires the UL transmission timing of the SCell and becomes capable of UL transmission, UL SCell scheduling by the base station eNB is started (step 8).

  On the other hand, in the SCell in which the PUCCH studied in Rel-13 is set, since the CSI of the SCell (here, CQI) is transmitted in the SCell, the base station eNB activates the PUCCH Cell. This cannot be detected at an early stage, and there is a problem that a delay may occur in the start of UL transmission scheduling in the SCell.

  This problem will be described with reference to FIG. In the example of FIG.6 (b), SCell which can transmit PUCCH is shown among SCell contained in sTAG. The CQI of the SCell is transmitted on the PUCCH of the SCell.

  In step 11, the SCell is set and an activation command for activating the SCell is transmitted (step 12). The user apparatus UE performs SCell activation processing, and the activation is completed in Step 13. However, since the UL synchronization of the SCell is not completed at this point, the user apparatus UE cannot transmit the CQI of the SCell to the base station eNB. Therefore, unlike the case of FIG. 6A, the base station eNB cannot determine the activation of the SCell based on the CQI. Therefore, the base station eNB detects the activation of the SCell, for example, with the passage of a predetermined worst value period (step 14). Thereafter, the PDCCH order transmission (step 15) and the RA procedure (step 16) are executed, thereby enabling UL transmission on the SCell and starting UL scheduling (step 17). Thus, a delay occurs in uplink scheduling.

  The present invention has been made in view of the above points, and in a mobile communication system in which a user apparatus and a base station communicate using a carrier aggregation including a secondary cell capable of transmitting uplink control information, the secondary cell is a user. An object of the present invention is to provide a technique that enables a base station to start uplink scheduling in the secondary cell at an early stage when set in a device.

According to an embodiment of the present invention, a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
A determination unit that determines the type of uplink control information in the secondary cell after receiving an activation instruction for the secondary cell from the base station;
When it is determined that the uplink control information is channel state information, the channel state information is transmitted in the primary cell, and when it is determined that the uplink control information is delivery confirmation information, the delivery confirmation information A user apparatus comprising: a transmission unit that transmits a message in the secondary cell.

Moreover, according to the embodiment of the present invention, a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When receiving an activation instruction for the secondary cell from the base station, the transmission control unit for transmitting uplink control information in the secondary cell in both the secondary cell and the primary cell,
The transmission control unit is provided with a user apparatus that stops transmission of uplink control information in the secondary cell in the primary cell after the activation of the secondary cell based on the activation instruction is completed.

Moreover, according to the embodiment of the present invention, a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When receiving an activation instruction for the secondary cell from the base station and further receiving a random access instruction including a dedicated preamble, a non-collision type random access procedure is executed in the secondary cell using the dedicated preamble. A random access procedure control unit;
After the non-collision type random access procedure is completed, there is provided a user apparatus comprising: a transmission unit that transmits uplink control information in the secondary cell to the base station in the secondary cell.

Moreover, according to the embodiment of the present invention, a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When the secondary cell set in the user apparatus belongs to sTAG, after receiving an activation instruction for the secondary cell from the base station, a TA timer for the sTAG is started without executing a random access procedure An uplink transmission control unit;
There is provided a user apparatus comprising: a transmission unit that transmits uplink control information in the secondary cell in the secondary cell during activation of the TA timer.

Further, according to the embodiment of the present invention, uplink control executed by a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell. An information transmission method,
After receiving an activation instruction for the secondary cell from the base station, determining a type of uplink control information in the secondary cell;
When it is determined that the uplink control information is channel state information, the channel state information is transmitted in the primary cell, and when it is determined that the uplink control information is delivery confirmation information, the delivery confirmation information Is transmitted in the secondary cell. An uplink control information transmission method is provided.

Further, according to the embodiment of the present invention, uplink control executed by a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell. An information transmission method,
When receiving an activation instruction for the secondary cell from the base station and further receiving a random access instruction including a dedicated preamble, a non-collision type random access procedure is executed in the secondary cell using the dedicated preamble. Steps,
An uplink control information transmission method comprising: transmitting uplink control information in the secondary cell to the base station in the secondary cell after the non-collision random access procedure is completed.

Further, according to the embodiment of the present invention, uplink control executed by a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell. An information transmission method,
When the secondary cell set in the user apparatus belongs to sTAG, after receiving an activation instruction for the secondary cell from the base station, a TA timer for the sTAG is started without executing a random access procedure Steps,
An uplink control information transmission method comprising: transmitting uplink control information in the secondary cell in the secondary cell during activation of the TA timer.

  According to the embodiment of the present invention, in a mobile communication system in which a user apparatus and a base station communicate using carrier aggregation including a secondary cell capable of transmitting uplink control information, the secondary cell is set as the user apparatus. In this case, it is possible to provide a technique that enables the base station to start uplink scheduling in the secondary cell early.

It is a figure for demonstrating Timing Advance (TA) control. It is a figure for demonstrating Timing Advance (TA) control. It is a figure for demonstrating Timing Advance (TA) control. It is a figure for demonstrating Multiple Timing Advances (MTA). It is a figure for demonstrating SCell PUCCH. It is a figure for demonstrating a subject. It is a system configuration figure in an embodiment of the invention. It is a figure for demonstrating the example of a basic operation | movement in 1st Embodiment. It is a figure which shows the UCI transmission method example 1 in 1st Embodiment. It is a figure which shows the UCI transmission method example 2 in 1st Embodiment. It is a figure which shows the UCI transmission method example 3 in 1st Embodiment. It is a figure for demonstrating the example of a basic operation | movement in 2nd Embodiment. It is a figure which shows the example of a CBRA procedure. It is a figure which shows the example of a CFRA procedure. It is a sequence diagram for demonstrating RA procedure using PDCCH order. It is a figure for demonstrating the example of the DCI format used as PDCCH order in this Embodiment. It is a figure which shows the example of "CrossCarrierSchedulingConfig". It is a figure for demonstrating the operation example in 3rd Embodiment. It is a block diagram of the user apparatus UE in 1st Embodiment. It is a block diagram of the base station eNB. It is a flowchart which shows the operation example of the user apparatus UE in 1st Embodiment. It is a block diagram of the user apparatus UE in 2nd Embodiment. It is a flowchart which shows the operation example of the user apparatus UE in 2nd Embodiment. It is a block diagram of the user apparatus UE in 3rd Embodiment. It is a flowchart which shows the operation example of the user apparatus UE in 3rd Embodiment.

  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. 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 employing carrier aggregation.

In addition, the “cell” configuring the CA is a cell in which the user apparatus UE is located, and may be called a serving cell. As an example, a “cell” that constitutes a CA consists of only a downlink CC, or a downlink CC and an uplink CC. Further, the release of the “LTE” 3GPP standard in this specification and the claims is an arbitrary release in which CA is introduced, but is not limited thereto.
(Whole system configuration)
FIG. 7 shows a configuration diagram of a communication system in the embodiment of the present invention (common to the first to third embodiments). As shown in FIG. 7, 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. 7, one base station eNB and one user apparatus UE are shown, but this is for convenience of illustration, and there may be a plurality of each.

  Also, in the example of FIG. 7, one cell is shown, but this is also for convenience of illustration, and there are a plurality of cells when CA is set. Further, for example, a configuration in which one or a plurality of RREs (remote radio apparatuses) connected to the base station eNB by an optical fiber or the like is provided in a place away from the base station eNB may be employed. In the configuration using the RRE, for example, a macro cell is formed by the PCell, a small cell is formed by the SCell under the RRE, and the user apparatus UE located in the small cell performs high-throughput communication by CA.

  Hereinafter, first to third embodiments will be described as examples of methods for solving the problems. In the following description, unless otherwise specified, “SCell” in sTAG is an SCell capable of PUCCH transmission.

  The control according to the present invention can also be applied to the case where activation / deactivation control is performed for each cell group composed of a plurality of cells, and “SCell” capable of PUCCH transmission in the following embodiments. May be replaced with a “cell group” consisting of an SCell group including at least one SCell capable of PUCCH transmission.

(First embodiment)
First, a first embodiment will be described. In 1st Embodiment, the user apparatus UE selects the cell which transmits UCI of the said type for every classification of UCI (Uplink Control Information: Uplink control information). In particular, from the viewpoint of solving the above-described problems, the user apparatus UE transmits the CSI of the SCell using the PCell, and transmits ACK / NACK (delivery confirmation information) using the SCell. The CSI here is CQI (the quality of the signal received by the UE in the downlink CC of the SCell). However, it is not limited to this. Moreover, transmitting ACK / NACK by SCell is transmitting ACK / NACK by PUCCH (for example, the channel of the band set at the both ends of the band of uplink CC) of the SCell. In the drawing, ACK / NACK is expressed as A / N.

  With reference to FIG. 8, a basic operation example in the first embodiment will be described. In step 101, SCell setting is performed by an RRC signal (RRC connection reconfiguration) transmitted from the base station eNB to the user apparatus UE. Here, pTAG / sTAG is set together with SCell addition setting.

  After that, after measuring the CC of the SCell, the user apparatus UE receives an activation command of the SCell from the base station eNB in the PCell (step 102). In response to the activation command, the user apparatus UE starts the SCell activation process. The activation process is an internal process of the user apparatus UE for enabling actual signal transmission / reception in the SCell, for example.

  In the example of FIG. 8, since the user apparatus UE is supposed to transmit the SCell CQI by the PCell instead of the SCell, the user apparatus UE transmits the SCell CQI by the PCell. Since the activation of the SCell is not completed, the signal reception at the SCell is not normally performed, and OOR (Out Of Range) is returned as the CQI of the SCell.

  In step 105, the activation of the SCell in the user apparatus UE is completed, and reception in the SCell can be normally performed. Therefore, a valid CCell CQI is returned to the base station eNB (step 106). Thereby, the base station eNB detects the activation of the SCell, and transmits the PDCCH order instructing the RA procedure (random access procedure) to the user apparatus UE using the SCell (step 107). The user apparatus UE executes the RA procedure for the SCell according to the PDCCH order (step 108). In this RA procedure, for example, the user apparatus UE performs processing such as transmitting an RA preamble to the base station eNB and receiving an RA response from the base station eNB in the SCell, acquires UL transmission timing information, and TA Start the timer. Thereby, since UL transmission by SCell is attained for the user apparatus UE, UL SCell scheduling by the base station eNB is started (step 109). After the RA procedure is completed, ACK / NACK of SCell is transmitted by SCell. In addition, the cell which transmits UCI may be designated with respect to the user apparatus UE from the base station eNB, and about the designation | designated method of the cell which transmits UCI, the identifier (Example: CellIndex, SCellIndex) of Cell to transmit may be sufficient. , And may be specified by being bound to UL resources (in terms of time and frequency).

  As described above, even when the SCell capable of PUCCH transmission is set, the base station eNB can detect the activation of the SCell early and start the UL transmission early by transmitting the CQI of the SCell in the PCell. Can do.

  Hereinafter, UCI transmission method examples 1 to 3 will be described as variations of a selection method for selecting a cell to be transmitted for each UCI type.

<UCI transmission method example 1>
A UCI transmission method example 1 will be described with reference to FIGS. 9 (a) and 9 (b). FIG. 9 shows that PCell (pTAG) and SCell (sTAG) are set in the user apparatus UE. In UCI transmission method example 1, when there is ACK / NACK of SCell, the ACK / NACK is transmitted by SCell. More specifically, it is as follows. The determination time unit is, for example, a subframe.

  When only ACK / NACK is generated as UCI in the SCell, the user apparatus UE transmits the ACK / NACK in the SCell (the case of FIG. 9B). When only the CQI is generated in the SCell, the user apparatus UE transmits the CQI through the PCell (case in FIG. 9A). Also, when there are SCell ACK / NACK and SCell CQI as UCI, the user apparatus UE transmits the ACK / NACK + CQI by SCell (case in FIG. 9B).

  In the UCI transmission method example 1, since transmission is performed using a PCell in the case of only CQI, the UCI offload effect to the SCell side is high when there is a lot of traffic. It should be noted that ACK / NACK cannot be transmitted by SCell before the activation of SCell is completed, but ACK / NACK occurs after completion of activation that enables reception of PDSCH, so there is substantially no problem.

<UCI transmission method example 2>
A UCI transmission method example 2 will be described with reference to FIGS. 10 (a) and 10 (b). FIG. 10 also shows that PCell (pTAG) and SCell (sTAG) are set in the user apparatus UE. In the UCI transmission method example 2, the UCI is transmitted by the SCell only when there is no SQ CQI, and the UCI is transmitted by the PCell in other cases. More specifically, it is as follows. The determination time unit is, for example, a subframe.

  When only ACK / NACK is generated as UCI in the SCell, the user apparatus UE transmits the ACK / NACK in the SCell (case in FIG. 10A). When only the CQI is generated in the SCell, the user apparatus UE transmits the CQI using the PCell (case in FIG. 10B). Also, when there is an SCell ACK / NACK and an SCell CQI, the user apparatus UE transmits the ACK / NACK + CQI by the PCell (case in FIG. 10B).

  In the UCI transmission method example 2, the base station eNB does not need to monitor both the PCell and the SCell at the CQI transmission timing in the user apparatus UE, so that the process is simplified compared to the UCI transmission method example 1. There is.

<UCI transmission method example 3>
Next, UCI transmission method example 3 will be described. In the UCI transmission method example 3, the user apparatus UE transmits the CCell CSI by both the PCell and the SCell. A procedure example in this case will be described with reference to FIG.

  As an assumption of FIG. 11, it is assumed that the additional setting of SCell is completed. The user apparatus UE receives the activation command for the SCell from the base station eNB (step 201). The user apparatus UE performs CSI reporting in both the PCell and the SCell during the period from the reception of the activation command to the actual activation (step 202). Here, the information reported as CSI may be only CQI. Moreover, the resource for transmitting the CSI on the PCell side may be designated from the base station eNB to the user apparatus UE by an RRC signal when setting the SCell.

  However, since the UL synchronization is not yet established on the SCell side during this period, the user apparatus UE cannot actually transmit CSI to the base station eNB. As an operation of the user apparatus UE in step 202, for example, an instruction to perform CSI reporting in both the PCell and the SCell is issued to the lower layer (radio unit etc.) by the judgment of the upper layer (control unit etc.). , It is in a state where CSI reporting in SCell cannot be executed.

  In step 203, the user apparatus UE completes the activation of the SCell. In this example, since CQI of SCell is transmitted by PCell, base station eNB can grasp | ascertain the activation timing of user apparatus UE.

  When the UL timing of the SCell is established in Step 204, the user apparatus UE stops PUCCH transmission (CSI transmission) on the PCell side (Step 205). Thereafter, the SCell's CSI is transmitted by the SCell (step 206).

  The “time when UL timing is established” in step 204 may be the time when the RA procedure of the SCell is completed, or the time when the TA timer is started. Further, the “time when the SCell RA procedure is completed” here means the time when the RA response is received, the time when the PUSCH for the RA response is transmitted, or the time when the contention resolution is transmitted (for example, when the Msg3 is transmitted, the response) Etc.).

(Second Embodiment)
Next, a second embodiment will be described. In the prior art, the base station eNB has instructed the user apparatus UE to perform the RA procedure after detecting that the SCell has been activated, but in the second embodiment, the base station eNB The user apparatus UE performs RA procedure in SCell (PUCCH SCell) without performing activation detection.

  A basic operation example in the second embodiment will be described with reference to FIG. As shown in FIG. 12, SCell addition setting is implemented from the base station eNB to the user apparatus UE (step 301), and an activation command (MAC CE) for activating the SCell is transmitted (step 302).

  The user apparatus UE that has received the SCell activation command completes the activation of the SCell (step 303). Here, transmission / reception of the signal by SCell is attained.

  Then, in the example of FIG. 12, triggered by the activation in step 303, the user apparatus UE executes the RA procedure in the SCell and acquires UL transmission timing to establish UL synchronization. As a result, the user apparatus UE can transmit UCI on the PUCCH, and the base station eNB detects the activation of the SCell in the user apparatus UE (step 305) and starts UL scheduling in the SCell (step 306). .

  In the second embodiment, as described above, the RA procedure can be executed based on the judgment of the user apparatus UE without waiting for the detection of the SCell activation in the base station eNB. The UL scheduling can also be started early on the station eNB side.

  As described above, the user apparatus UE activates the SCell by the activation command (Activation / Deactivation MAC CE) received from the base station eNB, and executes the RA procedure on the SCell.

  The trigger for starting the RA procedure in the SCell by the user apparatus UE may be when the SCell is actually activated as described above, or when the activation command (MAC CE) is received from the base station eNB. A procedure may be triggered. In the latter case, as an internal control of the user apparatus UE, an RA procedure (eg, processing module) is activated when an activation command is received. However, an RA procedure such as PRACH transmission is actually activated. After.

  The RA procedure of this embodiment may be triggered only when the PUCCH SCell becomes sTAG. When the SCell is not an sTAG (when the SCell is included in the pTAG), the user apparatus UE refers to the UL timing of the pTAG already established at the time of UL transmission in the SCell. Therefore, the base station eNB uses the PUCCH SCell. It is possible to detect that the SCell has been activated at the timing of receiving the CQI. Therefore, if the SCell is not an sTAG, the RA procedure may be activated as usual by the PDCCH order at this timing. In addition, the setting whether PUCCH SCell becomes sTAG is performed by the RRC signal received from the base station eNB at the time of SCell addition.

  Moreover, RA procedure start-up accompanying SCell activation in this Embodiment may be limited and implemented when the said SCell changes from an inactive state to an active state. That is, when the activation instruction is received again in the user apparatus UE for the already activated SCell, the RA procedure is not started unless the PDCCH order is received. That is, the RA procedure by the PDCCH order is performed as in the conventional case. Note that examples in which the activation instruction is received again by the user apparatus UE for the activated SCell include the following examples.

  In the user apparatus UE, CA including SCell # 1 and SCell # 2 is set, SCell # 1 (PUCCH SCell) is in an active state, SCell # 2 is in an inactive state, and the base station eNB is SCell # 2. Consider the case where an activation command is sent to. At this time, due to the structure of Activation / Deactivation command MAC CE, it is necessary to transmit an activation command to SCell # 1 in order to continue the active state of SCell # 1 (Non-patent Document 2). That is, the activation instruction is transmitted again to the activated SCell.

  The RA procedure in the present embodiment may be a collision-type RA procedure (CBRA) or a non-collision RA procedure (CFRA: Contention Free Random Access).

<Example of CBRA procedure>
FIG. 13 illustrates a procedure example when the user apparatus UE executes the CBRA procedure as the RA procedure. As illustrated in FIG. 13, the user apparatus UE detects an RA procedure start trigger (step 401). This trigger is, for example, that the SCell has actually been activated.

  In Step 402, the user apparatus UE transmits an RA preamble to the base station eNB using the PRACH of the SCell. The base station eNB returns an RA response including UL timing information to the user apparatus UE (step 403). In step 404, the user apparatus UE transmits Msg3 including the UE ID and the like to the base station eNB.

  When CBRA is executed as an RA procedure, there is no need to assign a preamble in advance, and there is an advantage that resource utilization efficiency does not decrease.

<Example of CFRA procedure>
Next, the CFRA procedure will be described. In general, there are two methods of instructing the user apparatus UE to execute the CFRA procedure: RRC and PDCCH order. The CFRA procedure execution instruction (RACH trigger) by the RRC signal is used at the time of handover or at the time of DC (Dual connectivity) setting. Moreover, PDCCH order is used when establishing UL timing on SCell at the time of SCell (sTAG) setting.

  In the CFRA procedure, the base station eNB assigns a preamble (UE dedicated) for each user apparatus UE to the user apparatus UE, and the user apparatus UE transmits the preamble to the base station eNB.

  In the present embodiment, when CFRA is applied as the RA procedure, for example, an individual preamble is allocated to the user apparatus UE using MAC CE (referred to as “RA trigger MAC CE”).

  An example of the CFRA procedure in this case will be described with reference to FIG. The SCell addition has been completed as a premise of FIG.

  In step 501, the user apparatus UE receives an activation command for the SCell from the base station eNB. Furthermore, in step 502, the user apparatus UE receives RA trigger MAC CE which instruct | indicates the RA procedure in the said SCell from the base station eNB (reception by PCell). In step 502, the base station eNB does not send the RA trigger MAC CE to the user apparatus UE after confirming the activation of the SCell. This is different from transmission of PDCCH order.

  The RA trigger MAC CE transmitted from the base station eNB in Step 502 includes a preamble index, a PRACH resource index, and a TAG-id necessary for the RACH of the user apparatus UE. Further, the MAC CE may be multiplexed into the same MAC PDU.

  In the user apparatus UE that has received the RA trigger MAC CE, after the SCell that has received the activation command is activated, the RA procedure in the PUCCH SCell (= SCell that has received the activation command) in the TAG specified by the TAG-id And the RA preamble including the preamble specified by the RA trigger MAC CE is transmitted by the SCell (step 503). The RA preamble is transmitted using the PRACH resource specified by the RA trigger MAC CE. In step 504, the user apparatus UE receives an RA response including UL timing information in the SCell. Then, UL synchronization is established, the user apparatus UE performs UCI transmission in the SCell, and the base station eNB starts UL scheduling.

  As described above, when the CFRA procedure is executed as the RA procedure in the present embodiment, the base station eNB needs to allocate individual resources in advance to the user apparatus UE, but the advantage that the RA procedure can be completed early. There is.

  The RA trigger MAC CE has been described as being used for CFRA activation. However, depending on the designation of the preamble index, it can be used as a trigger for the CBRA. In that case, as an example, CBRA is executed in the same procedure as described with reference to FIG.

  That is, when RA trigger MAC CE is used as a trigger for CBRA, the user apparatus UE receives an activation command for the SCell from the base station eNB, and further uses an RA trigger MAC CE including a preamble index corresponding to the designation of the CBRA. When received, the CBRA procedure is executed in the SCell, and after the CBRA procedure is completed, the UCI in the SCell is transmitted to the base station eNB in the SCell.

  The designation of CBRA execution when the RA trigger MAC CE is used as a trigger for CBRA is not limited to the preamble index but may be other information. Since the RA trigger MAC CE can be used for both CFRA and CBRA, it can be described as follows using the “RA procedure”.

  That is, when the user apparatus UE receives the activation command for the SCell from the base station eNB and further receives the RA trigger MAC CE (RA trigger signal), the user apparatus UE executes the RA procedure in the SCell, and the RA procedure is performed. After completion, the UCI in the SCell is transmitted to the base station eNB by the SCell.

<Instruction of RA procedure using PDCCH order>
The RA procedure instruction in the present embodiment is not limited to the example using MAC CE as described above. It is also possible to instruct the RA procedure using PDCCH which is a physical channel. That is, the RA procedure can be instructed by the PDCCH order.

  As already described with reference to FIG. 6 (b), in the prior art, the base station eNB detects that the PUCCH SCell to be instructed for the RA procedure is activated, and then the PDCCH order in the SCell. To the user apparatus UE, and causes the user apparatus UE to start the RA procedure with the SCell. On the other hand, in the technique according to the present embodiment described below, the base station eNB transmits the PDCCH order without detecting that the PUCCH SCell that is the target of instructing the RA procedure is activated. This eliminates the delay in uplink scheduling and enables uplink scheduling at an early stage.

  The processing contents of this example will be described in more detail with reference to the sequence diagram of FIG. In the sequence diagram of FIG. 15, PCell and PUCCH SCell are illustrated on the user apparatus UE side in order to indicate which cell (which carrier) the user apparatus UE uses to transmit and receive signals.

  In step 601, the base station eNB transmits, to the user apparatus UE, setting information for setting a cell for transmitting a PDCCH order (a cell to be received for the UE), and the user apparatus UE receives a cell for receiving the PDCCH order. To set (store) the cell. The setting information is transmitted using, for example, an RRC message (for example, Cross Carrier Scheduling Config), but is not limited thereto, and may be transmitted using a MAC signal. Moreover, it is good also as including the said setting information in the RRC message which sets PUCCH SCell, and transmitting.

  In this example, the base station eNB transmits a PDCCH order using a PCell, and the setting information in Step 601 includes information such as a cell index specifying this “PCell”. In addition, transmitting PDCCH order by PCell is an example, and it is good also as transmitting PDCCH order by SCell.

  When the user apparatus UE receives a PUCCH SCell activation command from the base station eNB (step 602), the PDCCH order for triggering the RA procedure of the PUCCH SCell is set to the cell (PCell in this example). ) Note that “waiting” refers to blindly decoding a signal of a predetermined resource in the carrier of the cell (PCell in this example) and confirming (monitoring) whether or not a PDCCH order addressed to itself has been received.

  On the other hand, after transmitting the activation command in Step 602 (or after receiving the ACK), the base station eNB sets the PDCCH order in the cell (PCell in this example) set in Step 601 to the user apparatus UE. Transmit (step 603).

  The PDCCH order includes information for designating a cell for starting the RA procedure in the user apparatus UE. In this example, the PUCCH SCell shown in FIG. 15 is specified. The information to be specified is, for example, a cell index. Also, the PDCCH order includes information specifying an RA preamble to be transmitted to the user apparatus UE using the PUCCH SCell (eg, Preamble Index) and information specifying a PRACH resource (eg, PRACH Mask Index).

  FIG. 16 shows an example of a DCI format corresponding to the PDCCH order of this embodiment. As shown in FIG. 16, an index of a cell for starting the RA procedure is set in a CIF (Carrier Indicator Field), and information such as a preamble index and a PRACH Mask Index is set in other fields.

  In step 603 of FIG. 15, when the user apparatus UE receives the PDCCH order in the PCell, the user apparatus UE triggers the RA procedure (step 604). However, at this point in time, activation of the PUCCH SCell that is a target for starting the RA procedure has not been completed, so the start of the RA procedure (RA preamble transmission) is pending.

  When the activation of the PUCCH SCell is completed in Step 605, the user apparatus UE starts an RA procedure on the PUCCH SCell (Steps 606 and 607). Thereafter, UL synchronization is established, and the user apparatus UE performs UCI transmission on the PUCCH SCell, and the base station eNB starts UL scheduling.

  The monitoring of the PDCCH order that is started in response to the above step 602 (activation command reception) stops, for example, when the user apparatus UE receives the PDCCH order from the base station eNB. Alternatively, it may be stopped when the activation of the SCell designated by the activation command is completed. Alternatively, it may be stopped when a predetermined period has elapsed since the activation command was received. In addition, after receiving the activation command, it may be stopped when the first PDCCH (DL assignment, UL grant, etc.) is received in the SCell designated by the activation command. Moreover, you may stop, when SCell designated by the activation command is deactivated (Example: Deactivation command reception, Deactivation timer expiration).

  The PDCCH order method in the present embodiment applies Cross Carrier Scheduling (CCS) that is transmitted by including PDCCH transmitted in a certain cell (scheduling cell) including scheduling information (DCI) of another cell. However, the PDCCH order method in the present embodiment is different from the conventional CCS in the following points.

  That is, in the conventional CCS, the scheduling cell is set semi-statically by RRC, so that the scheduling cell is not changed unless there is an instruction from the base station eNB. On the other hand, in the method of PDCCH order in the present embodiment, CCS is applied only when PUCCH SCell is activated (one shot operation), and after PUCCH SCell is activated, CCS is applied. Without, scheduling is performed as usual.

  FIG. 17 shows an example of information elements of an RRC message (Cross Carrier Scheduling Config) when the RA procedure trigger by the PDCCH order is performed as described above. The information element includes the setting information transmitted in step 601 of FIG. In FIGS. 17A and 17B, an area where a change occurs is underlined with respect to the existing “CrossCarrier Scheduling Config” (Non-Patent Document 3).

  Information of the field indicated by “for PRACH-Activation” illustrated in FIG. 17B is included in the setting information described in step 601 of FIG. As shown in the explanation of FIG. 17B, when the field exists, the CCS is applied only to the RA preamble resulting from the activation of the PUCCH SCell.

  Although the above PDCCH order has been described as being used for CFRA activation, it can also be used as a trigger for CBRA depending on the designation of the preamble index, as in the case of RA trigger MAC CE. That is, when the user apparatus UE receives a PDCCH order including a preamble index corresponding to the designation of CBRA from the base station eNB, the user apparatus UE executes the CBRA procedure in the PUCCH SCell, and after the CBRA procedure is completed, the UCI in the SCell Is transmitted to the base station eNB by the SCell. The designation of CBRA execution when the PDCCH order is used as a CBRA trigger is not limited to the preamble index, and may be performed using other information.

<Other examples>
In this embodiment, it is not essential to perform the RA procedure whenever the SCell is activated. For example, in the user apparatus UE, when the TA timer for the sTAG to which the SCell belongs is active, the RA procedure does not have to be executed even when the SCell changes from the inactive state to the active state. This is because when the TA timer is already activated for the sTAG, the UL synchronization of the SCell included in the sTAG has been established, and the RA procedure for UL synchronization is unnecessary.

  However, whether or not to perform the RA procedure during activation of the TA timer is instructed from the base station eNB to the user apparatus UE by an RRC signal or the like, and whether or not the user apparatus UE performs the RA procedure during activation of the TA timer according to the instruction. May be judged. Normally, the TA command (UL timing information) received during the CBRA procedure performed while the TA timer is activated is ignored by the user apparatus UE, but may not be ignored in this case.

(Third embodiment)
Next, a third embodiment will be described. In 3rd Embodiment, the case where UL transmission timing in SCell of sTAG in the user apparatus UE does not shift | deviate even if the user apparatus UE moves is assumed. As an example of such a case, there is a case where a small cell with narrow coverage is formed by the SCell.

  Under the above premise, in the third embodiment, the user apparatus UE performs UL transmission in the SCell without performing the RA procedure immediately after setting the PUCCH SCell.

  An operation example in the third embodiment will be described with reference to FIG. In step 701, the SCell is set from the base station eNB to the user apparatus UE. Here, addition of PUCCH SCell is instructed, and sTAG of the SCell is instructed.

  In Step 702, an activation command for the SCell is transmitted from the base station eNB to the user apparatus UE, and the user apparatus UE receives the activation command. In step 703, SCell activation is complete.

  In the example of FIG. 18, when the activation of the SCell is completed, the user apparatus UE autonomously starts the TA timer in the sTAG (step 703). The timing for starting the TA timer may be the timing when the activation command is received in step 702.

  The user apparatus UE has UL timing information in the SCell, and can perform UL transmission after step 603 in accordance with the timing information (step 704). For example, the UL timing information of the SCell may be notified from the base station eNB by broadcast information, a MAC signal, an RRC signal, or the like, and the user apparatus UE holds the UL timing information previously acquired by the RA procedure. However, the UL timing information may be used.

  After transmitting the activation command, the base station eNB monitors the CSI report by the SCell, and detects that the SCell has been activated by receiving a valid CQI of the SCell (step 705), and UL SCell. Scheduling is started (step 706).

  In addition, when the TA timer of the sTAG is already activated, the user apparatus UE restarts the TA timer when the SCell activation command is received or when the SCell is actually activated. Also good.

  Moreover, you may perform autonomous starting of TA timer only when there is an instruction | indication by the RRC signal etc. from the base station eNB. Furthermore, the TA timer initial value may be notified to the user apparatus UE by an RRC signal or the like instructing autonomous activation of the TA timer.

  As described above, in the third embodiment, since the CQI can be transmitted by the SCell without performing the RA procedure, the base station eNB can start UL scheduling at an early stage.

  The first to third embodiments described so far can be combined and implemented as long as no contradiction arises. Further, each of the user apparatus UE and the base station eNB may include a function that can implement all of the first to third embodiments, or include the function described in any one or two of the embodiments. It is good.

(Device configuration example)
Next, a configuration example in the user apparatus UE and the base station eNB that executes the processes described so far will be described.

<Example of Device Configuration According to First Embodiment>
First, in FIG. 19, the functional block diagram of the user apparatus UE which concerns on 1st Embodiment is shown. As illustrated in FIG. 19, the user apparatus UE includes a UL signal transmission unit 101, a DL signal reception unit 102, an RRC management unit 103, and a UCI transmission control unit 104. FIG. 19 shows only the functional units particularly related to the first embodiment in the user apparatus UE, and also has a function (not shown) for performing an operation based on at least LTE. Further, the functional configuration shown in FIG. 19 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  The UL signal transmission unit 101 includes a function of generating and wirelessly transmitting various physical layer signals from higher layer signals to be transmitted from the user apparatus UE. The DL signal receiving unit 102 includes a function of wirelessly receiving various signals from the base station eNB and acquiring higher layer signals from the received physical layer signals. Each of the UL signal transmission unit 101 and the DL signal reception unit 102 includes a function of executing CA that performs communication by bundling a plurality of CCs.

  Each of the UL signal transmission unit 101 and the DL signal reception unit 102 is assumed to include a packet buffer and perform layer 1 (PHY) and layer 2 (MAC, RLC, PDCP) processing. However, it is not limited to this.

  The RRC management unit 103 includes a function of performing processing such as setting / change / management of CA information, configuration change and the like while performing transmission / reception of RRC messages with the base station eNB.

  The UCI transmission control unit 104 includes a function of selecting a cell to be transmitted for each UCI type according to the first embodiment and instructing the UL signal transmission unit 101 to perform UCI transmission in the selected cell. The UCI transmission control unit 104 may be a functional unit included in the UL signal transmission unit 101.

  FIG. 20 shows a functional configuration diagram of the base station eNB according to the embodiment of the present invention. As for the base station eNB, a configuration common to the first to third embodiments is shown. As illustrated in FIG. 20, the base station eNB includes a DL signal transmission unit 201, a UL signal reception unit 202, an RRC management unit 203, and a scheduling unit 204. FIG. 20 shows only functional units that are particularly related to the embodiment of the present invention in the base station eNB, and has at least a function (not shown) for performing an operation based on LTE. In addition, the functional configuration illustrated in FIG. 20 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  The 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 receiving unit 202 includes a function of wirelessly receiving various signals from each UE and acquiring a higher layer signal from the received physical layer signal. Each of the DL signal transmission unit 201 and the UL signal reception unit 202 includes a function of executing CA that performs communication by bundling a plurality of CCs. Further, the DL signal transmission unit 201 and the UL signal reception unit 202 may be radio communication units installed remotely from the main body (control unit) of the base station eNB, like RRE.

  Each of the DL signal transmission unit 201 and the UL signal reception unit 202 includes a packet buffer, and is assumed to perform layer 1 (PHY) and layer 2 (MAC, RLC, PDCP) processing (however, this is not the only case). Not.)

  The RRC management unit 203 includes a function of transmitting / receiving an RRC message to / from the user apparatus UE and performing processing such as CA setting / change / management and configuration change.

  Scheduling unit 204 performs scheduling for each cell for user apparatus UE that performs CA, creates PDCCH allocation information, and instructs DL signal transmission unit 201 to transmit PDCCH including the allocation information. Including.

  An operation example of the user apparatus UE shown in FIG. 19 will be described with reference to the flowchart of FIG. It is assumed that the SCell addition setting by the RRC management unit 103 has already been made. After the DL signal receiving unit 102 of the user apparatus UE receives the SCell activation command (step 801), the UCI transmission control unit 104 determines the type of UCI of the SCell generated in the UL signal transmitting unit 101. (Step 802). If the type is only the CCell CQI of the SCell, the UCI transmission control unit 104 instructs the UL signal transmission unit 101 to transmit the CQI using the PCell, and transmits the CQI (Step 803). If the type includes ACK / NACK of the SCell, the UCI transmission control unit 104 instructs the UL signal transmission unit 101 to transmit the UCI using the SCell and transmits the UCI (step 804).

  The above operation is an example. The user apparatus UE has a function capable of executing all the operations described in the first embodiment.

  For example, the user apparatus UE is a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell, from the base station, After receiving an activation instruction for a secondary cell, a determination unit that determines a type of uplink control information in the secondary cell, and when it is determined that the uplink control information is channel state information, the channel state information is It can be configured as a user apparatus including a transmission unit that transmits in a primary cell and transmits the acknowledgment information in the secondary cell when the uplink control information is determined to be acknowledgment information. With this configuration, even when a secondary cell capable of transmitting uplink control information is used, channel state information of the secondary cell is transmitted in the primary cell, so that the base station can detect activation of the secondary cell early and perform uplink scheduling. It is possible to start early.

  When it is determined that the uplink control information includes channel state information and delivery confirmation information, the transmission unit may transmit the channel state information and the delivery confirmation information in the primary cell. According to this configuration, since the base station eNB only needs to monitor the primary cell at the transmission timing of the channel state information, the process can be simplified.

  When it is determined that the uplink control information includes channel state information and delivery confirmation information, the transmission unit may transmit the channel state information and the delivery confirmation information in the secondary cell. According to this configuration, particularly when the traffic amount is large, the UCI offload effect to the secondary cell side is enhanced.

  Further, the user apparatus UE is a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell, and from the base station, A transmission control unit that transmits uplink control information in the secondary cell in both the secondary cell and the primary cell when an activation instruction for the secondary cell is received, the transmission control unit being based on the activation instruction It can also be configured as a user apparatus that stops transmission of uplink control information in the secondary cell in the primary cell after the activation of the secondary cell is completed.

  With this configuration, even when a secondary cell capable of transmitting uplink control information is used, channel state information of the secondary cell is transmitted in the primary cell, so that the base station can detect activation of the secondary cell early and perform uplink scheduling. It is possible to start early.

<Example of Device Configuration According to Second Embodiment>
FIG. 22 shows a functional configuration diagram of a user apparatus UE according to the second embodiment. As illustrated in FIG. 22, the user apparatus UE includes a UL signal transmission unit 301, a DL signal reception unit 302, an RRC management unit 303, and an RA procedure control unit 304. FIG. 22 shows only functional units that are particularly related to the second embodiment in the user apparatus UE, and has at least a function (not shown) for performing an operation based on LTE. Further, the functional configuration shown in FIG. 22 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the function unit may be anything.

  In the configuration of FIG. 22, the UL signal transmission unit 301, the DL signal reception unit 302, and the RRC management unit 303 have the same functions as the UL signal transmission unit 101, the DL signal reception unit 102, and the RRC management unit 103 that have already been described. . As described in the second embodiment, the RA procedure control unit 304 includes a function of detecting a trigger of the RA procedure and instructing the UL signal transmitting unit 301 and the DL signal receiving unit 302 to execute the RA procedure.

  An operation example of the user apparatus UE illustrated in FIG. 22 will be described with reference to a flowchart of FIG. It is assumed that the SCell addition setting by the RRC management unit 303 has already been made. After the DL signal receiving unit 302 of the user apparatus UE receives the SCell activation command (step 901), the RA procedure control unit 304 activates the SCell in an inactive state by the SCell activation command. In other words, it is determined whether or not the SCell is in an inactive state when the activation command is received (step 902).

  When the command is to activate an inactive SCell, the RA procedure control unit 304 uses, for example, detection of actual activation of the SCell as a trigger to transmit the UL signal transmission unit 301 and the DL signal reception unit. 302 is instructed to execute the RA procedure, and the RA procedure is executed (step 903).

  The above operation is an example. The user apparatus UE has a function capable of executing all the operations described in the second embodiment.

  For example, the user apparatus UE is a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell, from the base station, When receiving an activation instruction for a secondary cell and further receiving a random access instruction including a dedicated preamble (e.g., MAC CE, PDCCH order using CCS), there is no collision in the secondary cell using the dedicated preamble. A random access procedure control unit that executes a random access procedure, and a transmitter that transmits uplink control information in the secondary cell to the base station in the secondary cell after the non-collision random access procedure is completed Configure as a device be able to.

  With this configuration, uplink synchronization can be established without waiting for the base station to detect activation of the secondary cell, and thus the base station can start uplink scheduling at an early stage.

  Further, in a mode in which the random access procedure control unit autonomously executes the collision type random access procedure, the secondary cell instructed to be activated by the activation instruction becomes active when the activation instruction is received. In some cases, the random access procedure control unit may not execute the collision type random access procedure. With this configuration, unnecessary procedures can be reduced and the amount of signaling can be reduced.

  Further, in the form in which the random access procedure control unit autonomously executes the collision type random access procedure, when the TA timer is activated for the sTAG to which the secondary cell belongs, the random access procedure control unit The random access procedure may not be executed. With this configuration, unnecessary procedures can be reduced and the amount of signaling can be reduced.

<Example of Device Configuration According to Third Embodiment>
FIG. 24 shows a functional configuration diagram of a user apparatus UE according to the third embodiment. As illustrated in FIG. 24, the user apparatus UE includes a UL signal transmission unit 401, a DL signal reception unit 402, an RRC management unit 403, and a UL transmission control unit 304. FIG. 24 shows only functional units that are particularly related to the third embodiment in the user apparatus UE, and has at least a function (not shown) for performing an operation based on LTE. The functional configuration shown in FIG. 24 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.

  In the configuration of FIG. 24, the UL signal transmission unit 401, the DL signal reception unit 402, and the RRC management unit 403 have the same functions as the UL signal transmission unit 101, the DL signal reception unit 102, and the RRC management unit 103 that have already been described. . As described in the third embodiment, the UL transmission control unit 404 activates the TA timer and does not execute the RA procedure when a trigger for starting the TA timer is detected under a specific condition. , Including a function of instructing the UL signal transmission unit 401 to transmit the UL signal.

  An operation example of the user apparatus UE illustrated in FIG. 24 will be described with reference to a flowchart of FIG. It is assumed that the SCell addition setting by the RRC management unit 403 has already been made. After the DL signal reception unit 402 of the user apparatus UE receives the SCell activation command (step 1001), the UL transmission control unit 404 determines whether the user apparatus UE meets a specific condition (step 1002). ). The specific condition is, for example, a command (TA timer autonomous activation instruction that instructs the TA station to perform an operation without executing the RA procedure in the added SCell by an RRC signal or the like from the base station eNB. ) Or a TA command MAC CE for the corresponding sTAG. Note that the control by the TA command MAC CE may be limited to a case where a predetermined value is indicated as the TA value.

  When the UL transmission control unit 404 determines that a specific condition is met, the UL transmission control unit 404 activates the TA timer and starts transmitting a UL signal upon detecting a TA timer activation trigger (eg, SCell activation completion) ( Step 1003). If the UL transmission control unit 404 determines that the specific condition is not met, the UL transmission control unit 404 executes the RA procedure (step 1004).

  The above operation is an example. The user apparatus UE has a function capable of executing all the operations described in the third embodiment.

  For example, the user apparatus UE is a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell that can transmit uplink control information and a primary cell, and is set in the user apparatus When the secondary cell belongs to sTAG, an uplink transmission control unit that activates a TA timer for the sTAG without performing a random access procedure after receiving an activation instruction for the secondary cell from the base station; It can be configured as a user apparatus including a transmission unit that transmits uplink control information in the secondary cell in the secondary cell during activation of the TA timer.

  With this configuration, uplink control information can be transmitted in the secondary cell without performing a random access procedure, so that the base station can detect activation of the secondary cell early and can start uplink scheduling early. Become.

  When the user apparatus receives a TA timer autonomous activation instruction from the base station, the uplink transmission control unit may activate the TA timer without executing the random access procedure. . With this configuration, the user apparatus UE can appropriately determine whether or not to execute the random access procedure.

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

  The base station eNB described in the embodiment of the present invention may include a CPU and a memory, and may be configured by a program being executed by a CPU (processor), or may be described in the embodiment. The configuration may be realized by hardware such as a hardware circuit having the above 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 user apparatus and the base station have been described using functional block diagrams, but such an apparatus may be realized in hardware, software, or a combination thereof. Software operated by a processor included in a user apparatus and software operated by a processor included in a base station according to the embodiment of the present invention are random access memory (RAM), flash memory, read-only memory (ROM), EPROM, and EEPROM. , A register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server, or any other suitable storage medium. 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.

UE user apparatus eNB base stations 101, 301, 401 UL signal transmission units 102, 302, 402 DL signal reception units 103, 303, 403 RRC management unit 104 UCI transmission control unit 201 DL signal transmission unit 202 UL signal reception unit 203 RRC management Unit 204 scheduling unit 304 RA procedure control unit 404 UL transmission control unit

Claims (10)

A user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
A determination unit that determines the type of uplink control information in the secondary cell after receiving an activation instruction for the secondary cell from the base station;
When it is determined that the uplink control information is channel state information, the channel state information is transmitted in the primary cell, and when it is determined that the uplink control information is delivery confirmation information, the delivery confirmation information A user apparatus comprising: a transmission unit that transmits a message in the secondary cell. The transmission unit transmits the channel state information and the delivery confirmation information in the primary cell when it is determined that the uplink control information includes channel state information and delivery confirmation information. User device. The transmission unit transmits the channel state information and the delivery confirmation information in the secondary cell when it is determined that the uplink control information includes channel state information and delivery confirmation information. User device. A user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When receiving an activation instruction for the secondary cell from the base station, the transmission control unit for transmitting uplink control information in the secondary cell in both the secondary cell and the primary cell,
The transmission control unit stops transmission of uplink control information in the secondary cell in the primary cell after the activation of the secondary cell based on the activation instruction is completed. A user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When receiving an activation instruction for the secondary cell from the base station and further receiving a random access instruction including a dedicated preamble, a non-collision type random access procedure is executed in the secondary cell using the dedicated preamble. A random access procedure control unit;
A user apparatus comprising: a transmission unit that transmits uplink control information in the secondary cell to the base station in the secondary cell after the non-collision random access procedure is completed. A user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When the secondary cell set in the user apparatus belongs to sTAG, after receiving an activation instruction for the secondary cell from the base station, a TA timer for the sTAG is started without executing a random access procedure An uplink transmission control unit;
A user apparatus comprising: a transmission unit that transmits uplink control information in the secondary cell in the secondary cell while the TA timer is activated. The uplink transmission control unit activates the TA timer without executing the random access procedure when the user apparatus receives an instruction for autonomous activation of the TA timer from the base station. The user device described. An uplink control information transmission method executed by a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
After receiving an activation instruction for the secondary cell from the base station, determining a type of uplink control information in the secondary cell;
When it is determined that the uplink control information is channel state information, the channel state information is transmitted in the primary cell, and when it is determined that the uplink control information is delivery confirmation information, the delivery confirmation information Transmitting the uplink control information in the secondary cell. An uplink control information transmission method executed by a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When receiving an activation instruction for the secondary cell from the base station and further receiving a random access instruction including a dedicated preamble, a non-collision type random access procedure is executed in the secondary cell using the dedicated preamble. Steps,
An uplink control information transmission method comprising: transmitting uplink control information in the secondary cell to the base station in the secondary cell after the non-collision random access procedure is completed. An uplink control information transmission method executed by a user apparatus that communicates with a base station in a mobile communication system that supports carrier aggregation including a secondary cell capable of transmitting uplink control information and a primary cell,
When the secondary cell set in the user apparatus belongs to sTAG, after receiving an activation instruction for the secondary cell from the base station, a TA timer for the sTAG is started without executing a random access procedure Steps,
An uplink control information transmission method comprising: transmitting uplink control information in the secondary cell in the secondary cell during activation of the TA timer.

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