JP2012070134A - Communication system, mobile station apparatus, base station apparatus, random access transmission method, and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system which makes efficient random access possible in a case where a mobile station apparatus needs adjustment of a plurality of uplink transmission timing in a communication system in which a base station apparatus and the mobile station apparatus perform communication by being connected concurrently with a plurality of in-zone cells.SOLUTION: A plurality of in-zone cells comprise a first in-zone cell which is not inactivated, and one or more activated or inactivated second in-zone cells; and a base station apparatus, in the case of configuring information required for a random access procedure in the first in-zone cell and the second in-zone cell, requests a mobile station apparatus to start the random access procedure by activating the second in-zone cell where the information required for the random access procedure has been configured (S201), and the mobile station apparatus starts the random access procedure in the case where the second in-zone cell where the information required for the random access procedure has been configured is activated (S202).

Description

  The present invention relates to a communication system, a base station apparatus, a mobile station apparatus, a random access transmission method, and an integrated circuit that efficiently perform random access.

  Evolved which realized high-speed communication by adopting OFDM (Orthogonal Frequency-Division Multiplexing) communication method and flexible scheduling of predetermined frequency and time unit called resource block in 3GPP (3rd Generation Partnership Project) which is a standardization project The standardization of Universal Terrestrial Radio Access (hereinafter referred to as EUTRA) was carried out.

  In 3GPP, advanced EUTRA that achieves higher-speed data transmission and has upward compatibility with EUTRA is being discussed. As a technique in Advanced EUTRA, carrier aggregation has been proposed. Carrier aggregation is a technique for improving a transmission rate by aggregating and using a plurality of different frequencies (also referred to as component carriers). Further, it has been proposed that a mobile station apparatus communicating with a base station apparatus using carrier aggregation has a plurality of uplink transmission timings (Timing Advance) for each frequency or component carrier (Non-patent Document 1). Non-Patent Document 2).

  In EUTRA, a random access procedure is prepared in order to adjust the uplink transmission timing of the mobile station apparatus. In addition to the method in which the mobile station apparatus autonomously determines the necessity of the random access procedure and starts the random access procedure, the base station apparatus performs downlink in order for the specific mobile station apparatus to start the random access procedure. There is a method in which information indicating the start of a random access procedure is set in a control channel and transmitted.

  Further, the base station apparatus configures one cell by combining one downlink component carrier and one uplink component carrier. Note that the base station apparatus can configure one cell with only one downlink component carrier.

R2-101567, NTT DOCOMO, 3GPP TSG-RAN WG2 # 69, 22-26 February 2010, San Francisco, USA R2-101196, Ericsson, ST Ericsson, 3GPP TSG-RAN WG2 # 69, 22-26 February 2010, San Francisco, USA

  However, as proposed in Non-Patent Document 1, it has a plurality of uplink transmission timings, and each uplink transmission timing is adjusted for each uplink component carrier (or for each uplink component carrier group or uplink frequency). In such a case, the mobile station apparatus needs to perform a random access procedure for each uplink component carrier. Non-Patent Document 1 and Non-Patent Document 2 describe a method using a downlink control channel and a method using higher layer signaling (RRC signaling, RRC message) in order to start random access.

  However, the newly added component carrier is in an inactivated state (details will be described later) in which data transmission / reception is not performed, and the downlink control channel cannot be transmitted to the deactivated component carrier. Therefore, the EUTRA method of using the downlink control channel to start the random access to the mobile station apparatus cannot be applied to Advanced EUTRA as it is. Non-Patent Document 2 does not show anything.

  In addition, the method using RRC signaling repeatedly adjusts the uplink transmission timing when the message size required to start random access increases and it is necessary to perform random access with a plurality of uplink component carriers. This not only complicates the processing of the mobile station apparatus, but also causes another problem that the random access collision probability increases due to an increase in the random access procedure.

  In view of the above problems, an object of the present invention is to provide a communication system, a base station apparatus, and a mobile station apparatus that enable efficient random access when the mobile station apparatus needs to adjust a plurality of uplink transmission timings. An object of the present invention is to provide a random access transmission method and an integrated circuit.

(1) In order to achieve the above object, the present invention takes the following measures. That is, the communication system of the present invention is a communication system in which a base station device and a mobile station device are connected simultaneously to a plurality of serving cells for communication, and the plurality of serving cells are not inactivated. One serving cell and one or more second serving cells that are activated or deactivated,
When the base station apparatus sets information necessary for the random access procedure in the first serving cell and the second serving cell, the second information in which the information necessary for the random access procedure is set The mobile station device is requested to start a random access procedure by activating the serving cell, and the mobile station device activates the second serving cell in which information necessary for the random access procedure is set. The random access procedure is started when it is converted into a random number.

  (2) In the communication system of the present invention, the base station apparatus activates the second serving cell in which information necessary for the random access procedure is set and is necessary for non-contention based random access. The mobile station apparatus is requested to start a non-contention based random access procedure by notifying the control information.

  (3) Further, in the communication system of the present invention, the mobile station apparatus is required for non-contention based random access while the second serving cell in which information necessary for the random access procedure is set is activated. When the control information is notified, the control information is used to start a non-contention based random access procedure.

  (4) In the communication system of the present invention, the activation of the second serving cell is notified by an L2 message.

  (5) Moreover, the base station apparatus of the present invention is a base station apparatus of a communication system in which a base station apparatus and a mobile station apparatus are connected simultaneously to a plurality of serving cells for communication, and the base station apparatus When the information necessary for the random access procedure is set in the first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated, the information is necessary for the random access procedure. The mobile station apparatus is requested to start a random access procedure by activating the second serving cell in which various information is set.

  (6) Moreover, the base station apparatus of this invention activates the said 2nd serving cell in which the information required for the said random access procedure was set, and notifies the control information required for non-contention based random access In this way, the mobile station apparatus is requested to start a non-contention based random random access procedure.

  (7) Further, the base station apparatus of the present invention is characterized in that the activation of the second serving cell is notified by an L2 message.

  (8) Moreover, the mobile station apparatus of the present invention is a mobile station apparatus of a communication system in which a base station apparatus and a mobile station apparatus are connected simultaneously to a plurality of serving cells to perform communication, from the base station apparatus If the information required for the random access procedure is set in the first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated, the information necessary for the random access procedure is required. The random access procedure is started when the second serving cell in which information is set is activated.

  (9) Also, the mobile station apparatus of the present invention notifies the control information necessary for non-contention based random access while the second serving cell in which information necessary for the random access procedure is set is activated. If it is, a non-contention based random access procedure is started using the control information.

  (10) Also, the random access transmission method of the mobile station apparatus of the present invention is a random access transmission in a mobile station apparatus of a communication system in which a base station apparatus and a mobile station apparatus are connected simultaneously to a plurality of serving cells for communication. The method, wherein the plurality of serving cells are composed of a first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated. When the base station apparatus sets information necessary for the random access procedure in the first serving cell and the second serving cell, the second information in which the information necessary for the random access procedure is set Requesting the mobile station device to start a random access procedure by activating a serving cell; and the mobile station device comprising the second serving cell in which information necessary for the random access procedure is set. There when activated, characterized in that it comprises the step of initiating the random access procedure.

  (11) Moreover, the integrated circuit of the mobile station apparatus of the present invention is an integrated circuit that performs random access of a mobile station apparatus in a communication system in which a base station apparatus and a mobile station apparatus are connected simultaneously to a plurality of serving cells to perform communication. In the circuit, information necessary for a random access procedure from the base station apparatus is set in a first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated. If the second serving cell in which information necessary for the random access procedure is set is activated, the random access procedure is started.

  In the present specification, the present invention is disclosed in terms of improvement of a communication system, a base station device, a mobile station device, and a random access transmission method when the mobile station device and the base station device are connected using a plurality of frequencies. The communication method to which the present invention is applicable is not limited to a communication method that is upward compatible with EUTRA, such as EUTRA or Advanced EUTRA. For example, the present invention can be applied to UMTS (Universal Mobile Telecommunications System).

  As described above, according to the present invention, when a mobile station apparatus that can be connected to a base station apparatus using a plurality of frequencies needs to adjust a plurality of uplink transmission timings, efficient random access is possible. A communication system, a base station apparatus, a mobile station apparatus, a random access transmission method, and an integrated circuit can be provided.

It is a block diagram which shows schematic structure of the mobile station apparatus in this invention. It is a block diagram which shows schematic structure of the base station apparatus in this invention. It is an example of the figure for demonstrating the component carrier and uplink physical channel which are set to the mobile station apparatus in this invention. It is a sequence chart figure for demonstrating the addition procedure of the secondary cell in this invention. It is a sequence chart figure for demonstrating the random access procedure in the 1st Embodiment of this invention. It is a sequence chart figure for demonstrating the random access procedure in the 2nd Embodiment of this invention. It is a flowchart figure for demonstrating the selection method of the random access procedure in the 2nd Embodiment of this invention. It is a sequence chart figure for demonstrating a Contention based Random Access procedure. It is a sequence chart figure for demonstrating a Non-contention based Random Access procedure. It is a figure which shows an example of the communication network structure which concerns on embodiment of this invention. It is the figure which showed an example of the setting of the component carrier with respect to the mobile station apparatus which concerns on embodiment of this invention.

  Before describing the embodiments of the present invention, the carrier aggregation, physical channel, and random access procedure according to the present invention will be briefly described.

[Career aggregation]
Carrier aggregation is a technology that aggregates (aggregates) a plurality of different frequencies (component carriers or frequency bands) and treats them as one frequency (frequency band). For example, when five component carriers having a frequency bandwidth of 20 MHz are aggregated by carrier aggregation, the mobile station apparatus can access these components as one frequency bandwidth of 100 MHz. The component carriers to be aggregated may be continuous frequencies, or may be frequencies at which all or part of them are discontinuous. For example, when the usable frequency is in the 800 MHz band, 2.4 GHz band, and 3.4 GHz band, one component carrier is in the 800 MHz band, another component carrier is in the 2 GHz band, and another component carrier is in the 3.4 GHz band. It may be transmitted by.

  It is also possible to aggregate continuous or discontinuous component carriers in the same frequency band, for example, the 2.4 GHz band. The frequency bandwidth of each component carrier may be a frequency bandwidth narrower than 20 MHz, and the frequency bandwidth may be different from each other. The base station apparatus determines the number of uplink or downlink component carriers to be allocated to the mobile station apparatus based on various factors such as the amount of retained data buffer, the reception quality of the mobile station apparatus, the load in the cell, and QoS. Can be increased or decreased. It is desirable that the number of uplink component carriers assigned by the base station apparatus is the same as or less than the number of downlink component carriers.

[Physical channel]
The main physical channels (or physical signals) used in EUTRA and Advanced EUTRA will be described. A channel means a medium used for signal transmission, and a physical channel means a physical medium used for signal transmission. The physical channel may be added or changed in the future in EUTRA and Advanced EUTRA. However, even if the physical channel is changed, the description of each embodiment of the present invention is not affected.

  Synchronization signals (Synchronization Signals) are composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately in the frequency domain. By the combination, 504 kinds of cell identifiers (Cell ID: PCI) for identifying base station apparatuses and frame timing for radio synchronization are shown. The mobile station device specifies the cell ID of the synchronization signal received by the cell search.

  A physical broadcast information channel (PBCH; Physical Broadcast Channel) is transmitted for the purpose of notifying control parameters (broadcast information (system information): System information) commonly used by mobile station apparatuses in a cell. Broadcast information that is not notified on the physical broadcast information channel is transmitted as a layer 3 message (system information) on the physical downlink shared channel with the radio resource notified on the downlink control channel. As broadcast information, a cell global identifier (CGI) indicating a cell-specific identifier, a tracking area identifier (TAI) for managing a standby area by paging, random access control information, and the like are notified.

  The downlink reference signal is a pilot signal transmitted at a predetermined power for each cell. The downlink reference signal is a known signal that is periodically repeated at a frequency / time position based on a predetermined rule. The mobile station apparatus measures the reception quality for each cell by receiving the downlink reference signal. The mobile station apparatus also uses the downlink reference signal as a reference signal for demodulating the physical downlink control channel or the physical downlink shared channel transmitted simultaneously with the downlink reference signal. As a sequence used for the downlink reference signal, a sequence that can be identified for each cell is used. In addition, although a downlink reference signal may be described as cell-specific reference signal (RS), the use and meaning are the same.

  A physical downlink control channel (PDCCH; Physical Downlink Control Channel) is transmitted in some OFDM symbols from the beginning of each subframe, and radio resource allocation information according to the scheduling of the base station device to the mobile station device, It is used for the purpose of instructing the adjustment amount of increase / decrease of transmission power. The mobile station apparatus monitors (monitors) a physical downlink control channel addressed to itself before transmitting / receiving a layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and By receiving the physical downlink control channel, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant (downlink assignment) at the time of reception from the physical downlink control channel.

  The physical uplink control channel (PUCCH) is a reception acknowledgment (ACK / NACK: Acknowledgement / Negative Acknowledgement) of data transmitted on the physical downlink shared channel and downlink propagation path information (CQI: Channel). It is used to perform a scheduling request (SR) that is an uplink radio resource request.

  A physical downlink shared channel (PDSCH) is used to notify paging and broadcast information as a layer 3 message that is downlink control data in addition to downlink data. The radio resource allocation information of the physical downlink shared channel is indicated by the physical downlink control channel.

  A physical uplink shared channel (PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. Similarly to the downlink, the radio resource allocation information of the physical uplink shared channel is indicated by the physical downlink control channel.

  A physical random access channel (PRACH) is a channel used to notify a preamble sequence and has a guard time. The preamble sequence is configured so as to express 6-bit information by preparing 64 types of sequences. The physical random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus. The mobile station apparatus transmits a radio resource request when the physical uplink control channel is not set, and transmission timing adjustment information (timing advance (TA)) required to match the uplink transmission timing with the reception timing window of the base station apparatus. The physical random access channel is used to request the base station apparatus. Specifically, the mobile station apparatus transmits a preamble sequence using the radio resource for the physical random access channel set by the base station apparatus. The mobile station apparatus that has received the transmission timing adjustment information sets a transmission timing timer (TA timer) that counts the effective time of the transmission timing adjustment information. During the effective time, the transmission timing adjustment state is set. The state is managed as an adjustment state. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Random access procedure]
A series of procedures associated with random access is referred to as a random access procedure. In EUTRA, there are two random access procedures: Contention based Random Access (contention based random access) and Non-contention based Random Access (non-contention based random access), both using physical random access channels. Done.

  The Contention based Random Access procedure is a random access procedure in which preamble sequences transmitted by different mobile station devices may collide (contention), and the mobile station device is not connected (communication) with the base station device. It is used for initial access or for a scheduling request for requesting uplink transmission resources when the mobile station apparatus is connected to the base station apparatus. The collision of preamble sequences means that a plurality of mobile station apparatuses transmit physical random access channels using the same preamble sequence using the same frequency / time resource. Note that a preamble sequence collision is also referred to as a random access collision.

  Non-contention based Random Access procedure is a random access procedure in which no collision occurs in preamble sequences transmitted by different mobile station devices, and the mobile station device is connected to the base station device, and uplink synchronization Is started in response to an instruction from the base station apparatus. The Non-contention based Random Access procedure is instructed by an RRC (Radio Resource Control: Layer 3) layer message and physical downlink control channel PDCCH control data.

  The preamble sequence (dedicated preamble) used in the Non-contention based Random Access procedure is individually notified from the base station apparatus to the mobile station apparatus. The preamble sequence used in the Contention based Random Access procedure is selected and used by the mobile station device at random during random access from the preamble sequences that are not used as individual preambles. Among the preamble sequences that can be used by the mobile station apparatus in a certain cell, the number of preamble sequences respectively used in the Contention based Random Access procedure and the Non-contention based Random Access procedure is notified from the base station apparatus.

  The Contention based Random Access procedure will be briefly described with reference to FIG. First, the mobile station apparatus 1 sends to the base station apparatus 2 a preamble sequence (random access preamble) selected based on the downlink radio propagation path state (path loss) and the size of message 3 (message transmitted in step S3). Transmit (step S1). The base station device 2 that has received the random access preamble calculates a transmission timing shift amount between the mobile station device 1 and the base station device 2 from the random access preamble, and transmits the response to the random access preamble (random access response). It transmits to the mobile station apparatus 1 including the transmission timing adjustment information for adjusting the timing deviation (step S2).

  The mobile station apparatus 1 checks the contents of the random access response, and adjusts the uplink transmission timing from the transmission timing adjustment information when the preamble number corresponding to the transmitted random access preamble is included in the random access response. When adjusting the transmission timing, the mobile station apparatus 1 starts a transmission timing timer (TA timer) in which the adjusted transmission timing is valid.

  Also, the mobile station apparatus 1 transmits an upper layer message (upper layer message) to the base station apparatus 2 based on the scheduling information included in the random access response (step S3). The base station apparatus 2 transmits a collision confirmation message (contention resolution) to the mobile station apparatus 1 that has received the upper layer message in step S3 (step S4), and completes the procedure.

  The non-contention based Random Access procedure will be briefly described with reference to FIG. First, the base station apparatus 2 notifies the mobile station apparatus 1 of the number of the dedicated preamble and the number of the physical random access channel to be used (random access channel number) (random access preamble allocation) (step S11). The random access channel number is a number indicating a physical random access channel to which an individual preamble of a number notified from the base station apparatus 2 to the mobile station apparatus 1 may be transmitted. For example, a certain random access channel number indicates that a dedicated preamble may be transmitted on all physical random access channels, and a certain random access channel number is transmitted on every two physical random access channels in the time direction. Indicates that it may be. The mobile station apparatus 1 transmits a preamble sequence (individual preamble) corresponding to the designated preamble number through a physical random access channel indicated by a random access channel number and permitted to transmit the dedicated preamble (step S12). . The base station apparatus 2 that has received the dedicated preamble calculates a transmission timing shift amount between the mobile station apparatus 1 and the base station apparatus 2 from the dedicated preamble, and a transmission timing shift in a response to the dedicated preamble (random access response). Is transmitted to the mobile station apparatus 1 including the transmission timing adjustment information for adjusting (step S13), and the procedure is completed.

  However, when the value of the preamble number notified from the base station apparatus 2 is 0, the mobile station apparatus 1 performs the Contention based Random Access procedure instead of the Non-contention based Random Access procedure. In this case, the mobile station apparatus 1 completes the procedure according to the procedure of steps S1 to S4 in FIG.

[Example of communication network configuration of the present invention]
FIG. 10 is a diagram illustrating an example of a communication network configuration according to the embodiment of the present invention. When the mobile station apparatus 1 can be wirelessly connected to the base station apparatus 2 by simultaneously using a plurality of frequencies (component carrier, Band 1 to Band 3) by carrier aggregation, the communication network configuration is one base station. The apparatus 2 includes transmission apparatuses 11 to 13 (and reception apparatuses 21 to 23 (not shown)) for each of a plurality of frequencies, and the configuration in which each frequency is controlled by one base station apparatus 2 is from the viewpoint of simplifying the control. Is preferred. The configuration of the base station apparatus 2 is not limited to FIG. However, the base station apparatus 2 may be configured to transmit a plurality of frequencies with a single transmission apparatus because the plurality of frequencies are continuous frequencies. Furthermore, a configuration in which transmission / reception timing differs for each frequency may be used. The number of transmitting devices and receiving devices and the frequency at which transmission and reception can be performed may be different. The communicable range of each frequency controlled by the transmission device of the base station device 2 is regarded as a cell. At this time, the areas (cells) covered by each frequency may have different widths and different shapes.

  However, in the description to be described later, each of the areas covered by the frequency of the component carrier configured by the base station apparatus 2 is referred to as a cell, and this is the definition of a cell in an actually operated communication system. Note that it can be different. For example, in some communication systems, some of the component carriers used by carrier aggregation may be defined simply as additional radio resources rather than cells. Moreover, it may be defined as an extended cell different from the conventional cell. By referring to the component carrier as a cell in the present invention, even if a case different from the definition of the cell in the actually operated communication system occurs, the gist of the present invention is not affected. Carrier aggregation is communication by a plurality of cells using a plurality of component carriers, and is also referred to as cell aggregation. The mobile station apparatus 1 may be wirelessly connected to the base station apparatus 2 via a relay station apparatus (or repeater) for each frequency. That is, the base station apparatus 2 of the present invention can be replaced with a relay station apparatus.

  The third generation base station apparatus 2 defined by 3GPP is referred to as a Node B (NodeB), and the base station apparatus in EUTRA and Advanced EUTRA is referred to as an eNodeB (eNodeB). Note that the third-generation mobile station device 1 defined by 3GPP is referred to as UE (User Equipment). The base station device 2 manages a cell that is an area where the mobile station device 1 can communicate, and the cell is also referred to as a macro cell, a femto cell, a pico cell, or a nano cell according to the size of the area that can communicate with the mobile station device 1. . When the mobile station apparatus 1 can communicate with a certain base station apparatus 2, a cell used for communication with the mobile station apparatus 1 among the cells of the base station apparatus 2 is a serving cell. The other cells are referred to as neighboring cells. That is, when the mobile station apparatus 1 and the base station apparatus 2 communicate using a plurality of cells using carrier aggregation, there are a plurality of serving cells.

[Component carrier configuration setting example]
FIG. 11 shows the correspondence between the downlink component carrier set by the base station apparatus 2 for the mobile station apparatus 1 and the uplink component carrier when the mobile station apparatus 1 according to the embodiment of the present invention performs carrier aggregation. It is the figure which showed an example of the relationship. FIG. 11 shows a correspondence relationship between two downlink component carriers (downlink component carrier DL_CC1, downlink component carrier DL_CC2) and two uplink component carriers (uplink component carrier UL_CC1, uplink component carrier UL_CC2). However, the present invention is not limited to the case of two component carriers. In FIG. 11, the downlink component carrier DL_CC1 and the uplink component carrier UL_CC1, and the downlink component carrier DL_CC2 and the uplink component carrier UL_CC2 are cell-specific connected (Cell Specific Linkage).

  The cell-specific connection is, for example, a correspondence relationship (linkage relationship) between uplink and downlink frequency bands accessible to the base station device 2 when the mobile station device 1 is not carrier-aggregated. The part of the broadcast information (SIB2: System Information Block Type 2) indicates the corresponding relationship. The cell specific connection is also referred to as SIB2 linkage. The correspondence relationship between the uplink and downlink frequencies in the cell is explicitly indicated as frequency information in broadcast information, or when not explicitly indicated, the uplink and downlink frequencies are uniquely determined for each operating frequency. It is instructed implicitly by using information on the specified frequency difference. In addition to these methods, other methods may be used as long as the correspondence relationship between uplink and downlink frequency bands can be shown for each cell.

  On the other hand, the base station apparatus 2 may individually set the correspondence relationship between the downlink component carrier and the uplink component carrier for each mobile station apparatus 1 separately from the cell-specific connection (individual connection: UE Specific Linkage). Is possible. At this time, the setting of the individual connection is indicated by the RRC message. The base station apparatus 2 can also assign a plurality of settings (configurations) necessary for transmission of the physical random access channel for each uplink component carrier or each uplink frequency.

  Considering the above matters, preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the present invention, detailed descriptions of known functions and configurations related to the present invention will be omitted if it is determined that the gist of the present invention will be obscured.

<First Embodiment>
A first embodiment of the present invention will be described below.
The present embodiment relates to a random access transmission method at the time of carrier aggregation of the mobile station device 1, and particularly shows a random access transmission method when the mobile station device 1 manages a plurality of uplink transmission timings.

  FIG. 1 is a block diagram showing an example of a mobile station apparatus 1 according to the first embodiment of the present invention. The mobile station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a measurement processing unit 104, a control unit 105, a random access control unit 106, a coding unit 107, a modulation unit 108, a transmission unit 109, and a timing management unit 110. The upper layer 111 is configured. The upper layer 111 includes RRC (Radio Resource Control) that performs radio resource control. Further, the random access control unit 106 functions as part of a MAC (Medium Access Control) that manages the data link layer.

  Prior to reception, mobile station apparatus control information is input from the upper layer 111 to the control unit 105, and control information related to reception is appropriately input to the reception unit 101, the demodulation unit 102, and the decoding unit 103 as reception control information. The mobile station apparatus control information is information necessary for radio communication control of the mobile station apparatus 1 configured by reception control information and transmission control information, is set by the base station apparatus 2 and system parameters, and requires an upper layer 111. In response, the data is input to the control unit 105. The reception control information includes information such as reception timing, multiplexing method, and radio resource arrangement information regarding each channel in addition to information on the reception frequency band.

  The reception signal is received by the reception unit 101. The receiving unit 101 receives a signal in the frequency band specified by the reception control information. The received signal is input to the demodulation unit 102. Demodulation section 102 demodulates the received signal, inputs the signal to decoding section 103, correctly decodes the downlink data and downlink control data, and inputs each decoded data to the upper layer. The measurement processing unit 104 measures the reception quality (SIR, SINR, RSRP, RSRQ, RSSI, path loss, etc.) of the downlink reference signal for each cell (component carrier), the physical downlink control channel or the physical downlink shared channel. Based on the measurement result of the reception error rate, downlink measurement information is generated, and the downlink measurement information is output to the upper layer 111. The downlink measurement information is used in the upper layer 111 to detect a radio link failure (Radio link failure) accompanied by radio link re-establishment and to perform radio link monitoring (Radio link monitoring) accompanied by stop of uplink transmission. It is done.

  Prior to transmission, mobile station apparatus control information is input from the upper layer 111 to the control unit 105, and control information related to transmission is transmitted as control information, a random access control unit 106, an encoding unit 107, a modulation unit 108, and a transmission unit 109. Is entered appropriately. The transmission control information includes information such as encoding information, modulation information, transmission frequency band information, transmission timing for each channel, multiplexing method, and radio resource arrangement information as uplink scheduling information of the transmission signal. The random access control information is input from the upper layer 111 to the random access control unit 106. The random access control information includes preamble information, radio resource information for physical random access channel transmission, and the like. The upper layer 111 sets transmission timing adjustment information and a transmission timing timer used for adjusting the uplink transmission timing to the timing management unit 110 as necessary. The timing management unit 110 manages the uplink transmission timing state (transmission timing adjustment state or transmission timing non-adjustment state) based on the set information.

  The encoding unit 107 receives uplink data and uplink control data from the upper layer 111, and also receives random access data information related to transmission of the physical random access channel from the random access control unit 106. The encoding unit 107 generates a preamble sequence transmitted through the physical random access channel based on the random access data information. The encoding unit 107 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit. Modulating section 108 modulates the output from encoding section 107. The transmission unit 109 maps the output of the modulation unit 108 to the frequency domain, converts the frequency domain signal into a time domain signal, and performs power amplification on a carrier wave of a predetermined frequency. Further, the uplink transmission timing is adjusted according to the transmission timing adjustment information input from the timing management unit 110 and transmitted. A physical uplink shared channel in which uplink control data is arranged typically constitutes a layer 3 message (radio resource control message; RRC message). In FIG. 1, the other components of the mobile station apparatus 1 are omitted because they are not related to the present embodiment.

  FIG. 2 is a block diagram showing an example of the base station apparatus 2 according to the first embodiment of the present invention. The base station apparatus includes a reception unit 201, a demodulation unit 202, a decoding unit 203, a control unit 204, a coding unit 205, a modulation unit 206, a transmission unit 207, an upper layer 208, and a network signal transmission / reception unit 209.

  Upper layer 208 inputs downlink data and downlink control data to the encoding unit. The encoding unit 205 encodes the input data and inputs it to the modulation unit 206. Modulation section 206 modulates the encoded signal. The signal output from the modulation unit 206 is input to the transmission unit 207. Transmitter 207 maps the input signal to the frequency domain, then converts the frequency domain signal to a time domain signal, transmits the amplified signal on a carrier having a predetermined frequency, and transmits the signal. The physical downlink shared channel in which downlink control data is arranged typically constitutes a layer 3 message (RRC message).

  In addition, the reception unit 201 converts a signal received from the mobile station device into a baseband digital signal. The digital signal is input to the demodulation unit 202 and demodulated. The signal demodulated by the demodulator 202 is then input to the encoder 203 and decoded, and the correctly decoded uplink control data and uplink data are output to the upper layer 208. Base station apparatus control information necessary for control of each block is information necessary for radio communication control of the base station apparatus 2 configured by reception control information and transmission control information, and a higher-level network apparatus (MME or gateway apparatus). ) And system parameters, and the upper layer 208 inputs to the control unit 204 as necessary. The control unit 204 transmits base station apparatus control information related to transmission to each block of the encoding unit 205, modulation unit 206, and transmission unit 207 as transmission control information, and base station apparatus control information related to reception to the reception control information. Are appropriately input to each block of the receiving unit 201, the demodulating unit 202, and the decoding unit 203. The RRC of the base station device 2 exists as part of the upper layer 208.

  On the other hand, the network signal transmission / reception unit 209 transmits or receives a control message between the base station apparatuses 2 or between the upper network apparatus and the base station apparatus 2. In FIG. 2, the other components of the base station apparatus 2 are omitted because they are not related to the present embodiment.

  The network configuration of the communication system in which the mobile station apparatus 1 and the base station apparatus 2 are arranged can be the same as that shown in FIG.

  FIG. 3 shows an example of the configuration of cells (component carriers) set in the mobile station apparatus 1 capable of carrier aggregation and uplink physical channel settings in the present invention. FIG. 3 shows an example in which two cells, that is, two downlink component carriers (DL_CC1, DL_CC2) and two uplink component carriers (UL_CC1, UL_CC2) are set in the mobile station apparatus 1. . In the example of FIG. 3, as the cell configuration, a component carrier that is cell-specifically connected with DL_CC1 and UL_CC1 and DL_CC2 and UL_CC2 as a pair is set for the mobile station apparatus 1. In addition, when activation of these component carriers is explicitly or implicitly instructed from the base station apparatus 2, the mobile station apparatus 1 uses two frequencies for downlink reception and uplink transmission, respectively. can do. On the other hand, when deactivation of the component carrier is explicitly or implicitly indicated, the mobile station device 1 cannot perform downlink reception and uplink transmission with the deactivated component carrier. Inactivation may be managed as a pair of downlink and uplink, or may be managed independently.

  Here, the activation or deactivation of the component carrier is configured to be controlled by an L2 message (layer 2 message) that can be interpreted by a layer 2 configuration task. That is, activation or deactivation is controlled by a control command recognized by layer 2 after being decoded by the physical layer (layer 1). Note that the L2 message in EUTRA and Advanced EUTRA is notified by a control command (MAC control element: MAC Control Element) interpreted in the MAC layer.

  Further, as the uplink physical channel setting, the transmission setting of the physical uplink control channel used for the radio resource request (uplink control channel setting for radio resource request) is set only to UL_CC1. In addition, transmission settings (random access channel settings) of different physical random access channels are made in the uplink component carriers of UL_CC1 and UL_CC2. That is, the mobile station apparatus 1 needs to manage the UL_CC1 and UL_CC2 transmission timing adjustment information, TA timer, transmission timing adjustment state / transmission timing non-adjustment state independently for each uplink component carrier.

  A cell composed of an uplink component carrier in which the radio resource request uplink control channel is set and a downlink component carrier that is cell-specifically connected to the uplink component carrier is referred to as a primary cell. . Moreover, the cell comprised from component carriers other than a primary cell is called a secondary cell (Secondary cell). Although the primary cell is not subject to activation / deactivation control (that is, it is considered to be always activated), the secondary cell has the activation / deactivation state, and the change of these states is In addition to being explicitly specified from the base station apparatus 2, the state is changed based on a timer set in the mobile station apparatus 1 for each component carrier.

  Further, the mobile station apparatus 1 detects a radio link failure based on the parameter specified by the base station apparatus 2 in the primary cell, and performs radio link monitoring using the parameter in at least the activated secondary cell. To do.

  The mobile station apparatus 1 may stop monitoring the uplink grant and the downlink grant used for scheduling the deactivated component carrier (secondary cell). Moreover, the mobile station apparatus 1 may stop the transmission of the uplink pilot channel called a sounding reference signal (SRS) regarding the uplink of the deactivated component carrier (secondary cell). Moreover, the mobile station apparatus 1 may implement a measurement with a sampling rate lower than the activated state regarding the downlink of the deactivated component carrier (secondary cell).

  Note that the scope of the present invention is not limited to the example of FIG. 3, and a plurality of uplink component carriers are set in the mobile station apparatus 1 as carrier aggregation, and a plurality of random access channel settings are set in different uplink component carriers. Applicable if set. For example, a pair of uplink and downlink component carriers constituting a secondary cell (or a secondary cell having only a downlink) is not cell-specific but may be individually set by the base station device 2 for each mobile station device 1. good.

  FIG. 4 is a sequence for explaining a procedure for adding a secondary cell so that the mobile station device 1 and the base station device 2 in the first embodiment start communication in a plurality of cells by carrier aggregation. It is a chart figure.

  In FIG. 4, the mobile station apparatus 1 selects a suitable cell (suitable cell) of the base station apparatus 2 by performing a cell search procedure for selecting an optimum cell, and is camping on the cell (idle mode). The procedure starts from. That is, the terminal information (UE context) of the mobile station device 1 is already registered in the network via the base station device 2, and the MME holds the information of the mobile station device 1. At this time, when the mobile station apparatus 1 shifts to the cell and connection state (connected mode) of the cell of the base station apparatus 2 by paging paging call processing or call processing, the mobile station apparatus 1 will be described with reference to FIG. The contention based Random Access procedure is started (step S101). The Contention based Random Access procedure at this time is always executed in the primary cell.

  The mobile station apparatus 1 that has completed the Contention based Random Access procedure transmits a mobile station apparatus capability information message to the base station apparatus 2 (step S102). The mobile station apparatus capability information message includes at least that the mobile station apparatus 1 can perform carrier aggregation using a plurality of component carriers (cells), a frequency band used in carrier aggregation, and a receivable bandwidth or component. This includes that a plurality of random access settings are possible for the number of carriers and a random access setting that is a setting for performing a plurality of random accesses. By receiving the mobile station apparatus capability information message, the base station apparatus 2 can know that the mobile station apparatus 1 can perform a plurality of random access settings, and can perform appropriate random access settings. .

  Subsequently, when the measurement configuration for measuring a neighboring cell including a different frequency different from the frequency of the serving cell is set from the base station device 2, the mobile station device 1 sets the neighboring cell according to the measurement setting. Start measurement. Then, the mobile station device 1 transmits a result of measurement based on the set measurement setting included in a message (measurement report message) (step S103). The base station device 2 comprehensively determines the measurement result reported in the measurement report message, the current load of the device itself, the traffic volume, etc., and instructs the mobile station device 1 to add a secondary cell. An additional message is transmitted (step S104).

  In the secondary cell addition message, information indicating at least a downlink frequency ID and a cell ID for identifying the secondary cell, a secondary cell ID, a bandwidth, and the like is set. Further, when the secondary cell to be added is a cell operated at an uplink transmission timing different from the uplink transmission timing of the primary cell of the mobile station device 1, the base station device 2 performs random access setting (random access resource, preamble). Information required for a random access procedure such as a downlink component carrier used for path loss calculation, transmission timing timer information, etc., is set in the secondary cell addition message.

  The mobile station apparatus 1 confirms the received secondary cell addition message, and when it is confirmed that the parameters are correctly set, adds the secondary cell based on the set parameters. At this time, the added secondary cell is added in an inactivated state. And when the addition of a secondary cell is completed, the mobile station apparatus 1 transmits a secondary cell addition completion message with respect to the base station apparatus 2, and completes a process (step S105).

  Each control message in FIG. 4 may reuse an existing RRC message in EUTRA. For example, a mobile station apparatus capability notification message is a UE Capability Information message, a measurement report message is a Measurement Report message, a secondary cell addition message is an RRC Connection Reconfiguration message, and a secondary cell addition completion message is an RRC Connection Reconfiguration Complete message. Reuse is possible just by doing.

  Here, the mobile station apparatus 1 is a case where the secondary cell instructed to be added by the base station apparatus 2 is a cell having an uplink transmission timing different from that of the primary cell, and the uplink transmission timing of the primary cell is adjusted. When starting communication using the secondary cell in a new state, it is necessary to adjust the uplink transmission timing of the secondary cell by performing a random access procedure and to start management of uplink transmission timing different from the primary cell. is there.

  FIG. 5 shows a method for the base station apparatus 2 of the present embodiment to start a random access procedure in a secondary cell (or secondary cell group) having uplink transmission timing different from that of the primary cell of the mobile station apparatus 1. It is a sequence chart figure. In order to notify the mobile station apparatus 1 whether the uplink transmission timing is the same, the base station apparatus 2 sets a transmission timing group ID (TA group ID) indicating the same uplink transmission timing when adding a secondary cell. It may be configured to set.

  When the TA group ID notified when the secondary cell is added is different from the TA group ID held, the mobile station apparatus 1 determines that the uplink transmission timing of the added secondary cell is different. The TA group ID value including the primary cell may be configured such that a fixed value (for example, zero) is allocated so that the mobile station apparatus 1 is not notified until a plurality of uplink transmission timings need to be managed. .

  The base station apparatus 2 notifies the mobile station apparatus 1 of a command for activating the secondary cell, and requests activation of the secondary cell (step S201). Hereinafter, activating the secondary cell is referred to as secondary cell activation. At this time, the activated cell may be configured such that a plurality of secondary cells are designated at the same time. Further, activation and deactivation may be specified at the same time. The secondary cell activation command is notified by the L2 message. The secondary cell activation command is preferably indicated using a MAC control element. The base station device 2 may transmit a secondary cell activation command in the primary cell of the mobile station device 1 or may be transmitted in any secondary cell that has already been activated.

  The mobile station apparatus 1 instructed by the base station apparatus 2 to activate a secondary cell having a different uplink transmission timing activates the secondary cell and starts a Contention based Random Access procedure (step S202). The Contention based Random Access procedure may be the same as the procedure described in FIG. However, each step (Step S1 to Step S4) in the Contention based Random Access procedure at this time is transmitted and received on the uplink and the downlink of the secondary cell.

  The L2 message related to secondary cell activation transmitted in step S201 in FIG. 5 may be the same as the L2 message used for conventional secondary cell activation. Here, as a specific control method, when (1) activation of the downlink component carrier and activation of the corresponding uplink component carrier are performed simultaneously, (2) activation of the downlink component carrier and uplink The case where the activation of the component carrier is performed separately will be described as an example.

  In the case of example (1), when the activation of the downlink of the secondary cell is notified by the L2 message from the base station device 2, the mobile station device 1 has a random access setting for the secondary cell to be activated. In this case, it is determined that the random access procedure is requested in the uplink corresponding to the downlink, and the random access procedure is started. The uplink correspondence relationship corresponding to the downlink is indicated by cell-specific connection by broadcast information or individual connection by RRC message.

  For example, the individual connection indicates a relationship with a downlink component carrier used for calculation of a path loss necessary for transmission power control of the uplink component carrier. Further, for example, the individual connection indicates a relationship with a downlink component carrier that receives a physical downlink control channel necessary for an uplink component carrier transmission schedule.

  The mobile station apparatus 1 ignores the received L2 message when activation is requested for a secondary cell having a transmission timing different from that of the primary cell and there is no random access setting corresponding to the secondary cell. It may be configured as such, or may be configured to activate only the secondary cell without starting the random access procedure.

  In addition, the mobile station device 1 is a case where activation is requested for a secondary cell having a transmission timing different from that of the primary cell, and there is a random access setting corresponding to the secondary cell, but the secondary cell transmits In the timing adjustment state, it may be configured to activate only the secondary cell without starting the random access procedure. That is, when the activation of the downlink of the secondary cell is notified by the L2 message from the base station apparatus 2, the mobile station apparatus 1 has a random access setting for the secondary cell to be activated, and transmission timing is not adjusted. In the state, it may be determined that the random access procedure is requested in the uplink corresponding to the downlink, and the random access procedure may be started.

  Further, the mobile station device 1 is a case where activation of a secondary cell is requested, and there is a random access setting corresponding to the uplink of the secondary cell, and the transmission timing is not adjusted, It may be determined that the condition is satisfied.

  In the case of the example (2), when the activation of the downlink of the secondary cell is notified from the base station apparatus 2 by the L2 message, the mobile station apparatus 1 performs only the activation of the downlink, and the downlink No control is performed for the corresponding uplink. On the other hand, when the activation of the uplink of the secondary cell is notified and there is a random access setting in the downlink corresponding to the uplink, it is determined that the random access procedure is requested, and the uplink is transmitted to the uplink. The random access procedure is started according to the corresponding downlink random access setting. The downlink correspondence relationship corresponding to the uplink is indicated by cell-specific connection by broadcast information or individual connection by RRC message.

  For example, the individual connection indicates a relationship with a downlink component carrier used for calculation of a path loss necessary for transmission power control of the uplink component carrier. Further, for example, the individual connection indicates a relationship with a downlink component carrier that receives a physical downlink control channel necessary for an uplink component carrier transmission schedule.

  The mobile station apparatus 1 is a case where activation is requested for the uplink of the secondary cell having a transmission timing different from that of the primary cell, and there is no random access setting in the downlink corresponding to the uplink of the secondary cell. In this case, the received L2 message may be ignored, or the activation of the secondary cell may be performed without starting the random access procedure.

  Further, the mobile station apparatus 1 is a case where activation is requested for the uplink of the secondary cell having a transmission timing different from that of the primary cell, and the random access setting is set in the downlink corresponding to the uplink of the secondary cell. However, when the uplink of the secondary cell is in the transmission timing adjustment state, the secondary cell may be configured to activate only the uplink of the secondary cell without starting the random access procedure. That is, when the activation of the uplink of the secondary cell is notified by the L2 message from the base station apparatus 2, the mobile station apparatus 1 has a random access setting for the downlink corresponding to the uplink, and When the uplink is in a transmission timing non-adjusted state, it may be determined that a random access procedure is requested, and the random access procedure may be started according to the downlink random access setting corresponding to the uplink.

  Further, the mobile station device 1 is a case where activation of a secondary cell is requested, and there is a random access setting corresponding to the uplink of the secondary cell, and the transmission timing is not adjusted, It may be determined that the condition is satisfied.

  Further, the mobile station apparatus 1 satisfies the above conditions in the examples (1) and (2), but the downlink secondary cell that the uplink secondary cell performing the random access procedure refers to calculate the path loss. The received L2 message may be configured to be ignored when the reception quality is degraded, or the secondary cell may be activated only without starting the random access procedure. good. The reception quality is deteriorated indicates that a certain time has elapsed since the downlink reference signal of the secondary cell does not satisfy the predetermined reception quality.

  In addition, the mobile station apparatus 1 satisfies the above-described conditions in the examples (1) and (2), but when the uplink transmission is prohibited in the secondary cell performing the random access procedure, the received L2 message is transmitted. It may be configured to be ignored, or may be configured to activate only the secondary cell without starting the random access procedure. “Uplink transmission is prohibited” means that SRS, a physical uplink control channel, a physical uplink shared channel, and the like are set, but transmission of these physical channels is performed in an upper layer (typically RRC). Indicates a more stopped state.

  Further, the L2 message related to the secondary cell activation transmitted in step S201 in FIG. 5 includes an index number indicating that a control command indicating activation or deactivation is included, and activation or deactivation And at least information indicating a secondary cell to be set. As an example, information indicating the secondary cell is indicated by a bitmap table. At this time, the mobile station apparatus 1 activates the secondary cell when the received bitmap table is “1”, and deactivates the secondary cell when the received bitmap table is “0”. The meanings of activation and deactivation indicated by the bitmap may be reversed. The association between the bit position of the bitmap table and the secondary cell may be notified by the RRC message. Further, the order of bits in the bitmap table may match the order of secondary cell IDs (ascending order or descending order).

  As another example, information indicating a secondary cell is configured to include 1-bit information indicating activation or deactivation and a secondary cell ID. At this time, the mobile station apparatus 1 performs either activation or deactivation control on the instructed secondary cell ID.

  Thus, according to the first embodiment, when the base station apparatus 2 is configured with a plurality of uplink frequencies (uplink component carriers) having different uplink transmission timings in the mobile station apparatus 1, Requests start of uplink transmission timing adjustment using two messages. Further, the mobile station device 1 activates the designated component carrier (cell) by the layer 2 message transmitted from the base station device 2 and at the same time determines whether or not random access has started, and if necessary, Start the random access procedure.

  As described above, the method used in the conventional EUTRA can solve the problem that the inactivated secondary cell cannot instruct the start of the random access procedure. That is, it is possible to solve the problem that the mobile station device 1 cannot start a random access procedure in a cell other than the primary cell by the physical downlink control channel. Furthermore, since the base station apparatus 2 uses the L2 message used to activate the component carrier (cell) as a start command for the random access procedure, the L2 message can be reused without being extended. The activation of the component carrier (cell) is executed by the base station apparatus 2 at an appropriate timing for each mobile station apparatus 1 according to the buffer amount of the mobile station apparatus 1 and the QoS of the service. It is also possible to suppress the occurrence of a necessary random access procedure.

<Second Embodiment>
A second embodiment of the present invention will be described below. This embodiment demonstrates the random access transmission method which starts a Non-contention based Random Access procedure with a secondary cell using a L2 message. The configurations of the mobile station device 1 and the base station device 2 used in the present embodiment may be the same as those shown in FIGS.

  Also, the configuration of the cell (component carrier) set in the mobile station apparatus 1 and the uplink physical channel setting may be the same as in FIG.

  FIG. 6 shows a method for the base station apparatus 2 of the present embodiment to start a random access procedure in a secondary cell (or secondary cell group) having an uplink transmission timing different from that of the primary cell of the mobile station apparatus 1. It is a sequence chart figure. In order to notify the mobile station apparatus 1 whether the uplink transmission timing is the same, the base station apparatus 2 sets a transmission timing group ID (TA group ID) indicating the same uplink transmission timing when adding a secondary cell. It may be configured to set. Note that the sequence chart relating to the addition of secondary cells up to FIG. 6 is the same as FIG.

  When the TA group ID notified when the secondary cell is added is different from the TA group ID held, the mobile station apparatus 1 determines that the uplink transmission timing of the added secondary cell is different. The TA group ID value including the primary cell may be configured such that a fixed value (for example, zero) is allocated so that the mobile station apparatus 1 is not notified until a plurality of uplink transmission timings need to be managed. .

  The base station apparatus 2 notifies the mobile station apparatus 1 of a secondary cell activation command and non-contention based Random Access designation information as a set, and requests activation of the secondary cell (step S301). At this time, the activated cell may be configured such that a plurality of secondary cells are designated at the same time. Further, activation and deactivation may be specified at the same time. Both the secondary cell activation command and the non-contention based Random Access designation information are notified by one L2 message. The secondary cell activation command and the non-contention based Random Access designation information are preferably indicated using a MAC control element. The base station apparatus 2 may transmit a secondary cell activation command and non-contention based Random Access designation information in the primary cell of the mobile station apparatus 1 or in any secondary cell that has already been activated. good.

  Here, the base station apparatus 2 includes at least the non-contention based Random Access designation information and transmits the dedicated preamble number and the random access channel number to be used.

  The mobile station apparatus 1 instructed by the base station apparatus 2 to activate a secondary cell having a different uplink transmission timing activates the secondary cell and uses the notified Non-contention based Random Access designation information. -The contention based Random Access procedure is started (step S302). The Non-contention based Random Access procedure may be the same as the procedure described in FIG. However, each step (step S11 to step S13) in the Non-contention based Random Access procedure at this time is transmitted and received on the uplink and the downlink of the secondary cell.

  The L2 message related to secondary cell activation transmitted in step S301 in FIG. 6 may be the same as the L2 message used for conventional secondary cell activation. Since the specific control method and the configuration of the included control command have been described in the first embodiment, the details are omitted.

  Further, the L2 message related to the Non-contention based Random Access procedure transmitted in step S301 in FIG. 6 includes an index number indicating that information necessary for the Non-contention based Random Access procedure is included, and the Non-contention At least information indicating a dedicated preamble number and a random access channel number used for the based Random Access procedure is set.

  Here, when a plurality of secondary cells are activated simultaneously by one secondary cell activation command, the non-contention based Random Access designation information indicates a cell from which the mobile station apparatus 1 starts a random access procedure. The secondary cell ID may be included as information (may be added). Alternatively, the base station apparatus 2 sets information necessary for the random access procedure only in one secondary cell among a plurality of secondary cells set with the same TA group ID, and randomly selects non-contention based Random Access designation information. The TA group ID may be included (may be added) as information indicating a cell for starting the access procedure. Thereby, when the base station apparatus 2 instructs the mobile station apparatus 1 to activate a plurality of secondary cells, the base station apparatus 2 causes the mobile station apparatus 1 to start the Non-contention based Random Access procedure. A cell can be indicated.

  In addition, when the base station apparatus 2 sets information required for the random access procedure only in one secondary cell having different uplink transmission timing, the secondary cell ID or TA group is set in the Non-contention based Random Access designation information. It is not necessary to include the ID, or the mobile station device 1 does not need to confirm the secondary cell ID or TA group ID included (added) in the non-contention based Random Access designation information.

  In addition, when the mobile station apparatus 1 can simultaneously execute only one random access procedure, the base station apparatus 2 includes non-contention based Random Access designation information for one cell in one secondary cell activation command. You may be made to do. At this time, the mobile station device 1 is configured to ignore the received L2 message when non-contention based Random Access designation information for a plurality of cells is included in one secondary cell activation command. Alternatively, it may be configured to activate only the secondary cell without starting the random access procedure. Or you may start a Non-contention based Random Access procedure with respect to arbitrary one cells.

  In addition, when the mobile station apparatus 1 can simultaneously execute a plurality of random access procedures, the base station apparatus 2 includes non-contention based Random Access designation information for a plurality of cells in one secondary cell activation command. You may do it. At this time, the mobile station apparatus 1 activates a plurality of designated secondary cells and starts a non-contention based Random Access procedure in each designated secondary cell.

  FIG. 7 shows either of the Contention based Random Access procedure and the Non-contention based Random Access procedure when the mobile station device 1 of the present embodiment activates a secondary cell having an uplink transmission timing different from that of the primary cell. It is an example of the flowchart figure used for judgment whether an access procedure is selected.

  The mobile station device 1 determines whether or not a secondary cell activation command is received from the base station device 2 using the L2 message (step S401). If the mobile station apparatus 1 does not receive the secondary cell activation command with the L2 message, the mobile station apparatus 1 returns to step S401 and repeats the process. When the mobile station device 1 receives the command for activating the secondary cell with the L2 message (Yes in step S401), the mobile station device 1 proceeds to step S402. In step S402, the mobile station apparatus 1 is a case where activation of a secondary cell having an uplink transmission timing different from that of the primary cell is requested, and whether there is a random access setting corresponding to the uplink of the secondary cell. Judging. If the above condition is not satisfied (No in step S402), the random access procedure is unnecessary, and the process ends. In step S402, the mobile station apparatus 1 is a case where activation of a secondary cell having an uplink transmission timing different from that of the primary cell is requested, and there is a random access setting corresponding to the uplink of the secondary cell, and When the transmission timing is not adjusted, it may be determined that the above condition is satisfied.

  Moreover, the mobile station apparatus 1 is a case where activation of a secondary cell is requested | required in step S402, Comprising: The random access setting corresponding to the uplink of the said secondary cell exists, and it is a transmission timing non-adjustment state. In this case, it may be determined that the above condition is satisfied.

  On the other hand, if the above condition is satisfied (Yes in step S402), it is determined in step S403 whether a Non-contention based Random Access procedure is requested. When the mobile station apparatus 1 is notified of Non-contention based Random Access designation information together with the activation of the secondary cell in the L2 message, and the number of the individual preamble included in the Non-contention based Random Access designation information is not 0 , It is determined that the Non-contention based Random Access procedure is requested, the Non-contention based Random Access procedure is performed (step S404), and the process is terminated.

  When only activation of the secondary cell is specified in the L2 message, or when the number of the individual preamble included in the Non-contention based Random Access specification information is 0, the mobile station device 1 is Contention based Random Access Is determined, Contention based Random Access procedure is performed (step S405), and the process is terminated.

  Thus, according to the second embodiment, when the base station apparatus 2 is configured with a plurality of uplink frequencies (uplink component carriers) having different uplink transmission timings in the mobile station apparatus 1, Request the start of uplink transmission timing adjustment using the Non-contention based Random Access procedure using 2 messages. In addition, the mobile station apparatus 1 activates the designated component carrier (cell) based on the layer 2 message transmitted from the base station apparatus 2 and at the same time determines whether or not the random access procedure is started, and is necessary. For example, one of the Contention based Random Access procedure and the Non-contention based Random Access procedure is selected and started.

  As described above, in addition to the first embodiment, the mobile station apparatus 1 can perform the Non-contention based Random Access procedure, so that the collision probability of random access is reduced, and the uplink component carrier The time required for activation of the (cell) is shortened. The base station apparatus 2 comprehensively determines the utilization efficiency of radio resources, the load status of the own station and the mobile station apparatus 1, and the Contention based Random Access procedure and the Non-contention based Random Access procedure for the mobile station apparatus 1. It is possible to specify either one of them, so that efficient scheduling can be performed.

  Moreover, you may limit the random access procedure performed simultaneously with activation of a secondary cell to a Non-contention based Random Access procedure. When only the secondary cell activation command is notified in the layer 2 message, the mobile station device 1 does not execute the random access procedure, and the secondary cell activation command and non-contention based Random Access designation information in the layer 2 message. May be executed, a random access procedure may be executed. In this case, the mobile station apparatus 1 may execute the Contention based Random Access procedure only when the Non-contention based Random Access designation information indicates that the Contention based Random Access procedure is to be executed. . For example, the mobile station apparatus 1 may perform the Contention based Random Access procedure instead of the Non-contention based Random Access procedure only when the value of the preamble number included in the Non-contention based Random Access designation information is 0. Good.

  The embodiment described above is merely an example, and can be realized using various modifications and replacement examples. For example, this uplink transmission scheme can be applied to both communication systems of the FDD (frequency division duplex) scheme and the TDD (time division duplex) scheme. In each embodiment, an example using a path loss as a measurement value of a downlink component carrier has been described. However, other measurement values (SIR, SINR, RSRP, RSRQ, RSSI, BLER) may be used instead. It is also possible to use a combination of a plurality of these measured values.

  Further, for convenience of explanation, the mobile station device 1 and the base station device 2 of the embodiment have been described using functional block diagrams, but the functions of each part of the mobile station device 1 and the base station device 2 or one of these functions The mobile station device 1 and the base station device 2 are controlled by recording a program for realizing the unit on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. You can do it. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a semiconductor medium (eg, RAM, nonvolatile memory card, etc.), an optical recording medium (eg, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (eg, , A magnetic tape, a flexible disk, etc.) and a storage device such as a disk unit built in a computer system. Furthermore, the “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. .

  In addition, each functional block or various features of the mobile station device 1 and the base station device 2 used in the above embodiments may be configured in a circuit including an LSI that is typically an IC (integrated circuit). . In that case, the integration density of the LSI may be realized at any density. Each functional block and various features may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  As mentioned above, although embodiment of this invention has been explained in full detail based on the specific example, it is clear that the meaning of this invention and a claim are not limited to these specific examples. In other words, the description in the present specification is for illustrative purposes and does not limit the present invention.

DESCRIPTION OF SYMBOLS 1 ... Mobile station apparatus 2 ... Base station apparatuses 11-13 ... Transmission apparatus 101, 201 ... Reception part 102, 202 ... Demodulation part 103, 203 ... Decoding part 104 ... Measurement processing part 105, 204 ... Control part 106 ... Random access processing Reference numerals 107, 205: encoding sections 108, 206: modulation sections 109, 207: transmission sections 110: timing management sections 111, 208: upper layer 209 ... network signal transmission / reception sections

Claims (11)

A communication system in which a base station device and a mobile station device are connected simultaneously to a plurality of serving cells to perform communication,
The plurality of serving cells include a first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated.
When the base station apparatus sets information necessary for the random access procedure in the first serving cell and the second serving cell, the second information in which the information necessary for the random access procedure is set Requesting the mobile station device to start a random access procedure by activating a serving cell;
The mobile station apparatus starts the random access procedure when the second serving cell in which information necessary for the random access procedure is set is activated.   The base station apparatus activates the second serving cell in which information necessary for the random access procedure is set, and notifies the control information necessary for non-contention based random access by the mobile station apparatus 2. The communication system according to claim 1, further comprising requesting the start of a non-contention based random access procedure.   The mobile station apparatus activates the second serving cell in which information necessary for the random access procedure is set, and when the control information necessary for non-contention based random access is notified, The communication system according to claim 2, characterized in that a non-contention based random access procedure is started using.   The communication system according to any one of claims 1 to 3, wherein the activation of the second serving cell is notified by an L2 message. A base station apparatus of a communication system in which a base station apparatus and a mobile station apparatus are connected simultaneously with a plurality of serving cells to perform communication,
When the base station apparatus sets information necessary for a random access procedure in a first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated, A base station apparatus that requests the mobile station apparatus to start a random access procedure by activating the second serving cell in which information necessary for the random access procedure is set.   By activating the second serving cell in which information necessary for the random access procedure is set and notifying control information necessary for non-contention based random access to the mobile station apparatus, non-contention based random random 6. The base station apparatus according to claim 5, wherein a start of an access procedure is requested.   The base station apparatus according to claim 5 or 6, wherein the activation of the second serving cell is notified by an L2 message. A mobile station apparatus of a communication system in which a base station apparatus and a mobile station apparatus are connected simultaneously to a plurality of serving cells to perform communication,
When the information required for the random access procedure is set from the base station device to the first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated,
The mobile station apparatus, wherein the random access procedure is started when the second serving cell in which information necessary for the random access procedure is set is activated.   Non-contention base using the control information when the second serving cell in which information necessary for the random access procedure is set is activated and control information necessary for non-contention based random access is notified The mobile station apparatus according to claim 8, wherein a random access procedure is started. A random access transmission method in a mobile station device of a communication system in which a base station device and a mobile station device are connected and communicated simultaneously with a plurality of serving cells,
The plurality of serving cells include a first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated.
When the base station apparatus sets information necessary for the random access procedure in the first serving cell and the second serving cell, the second information in which the information necessary for the random access procedure is set Requesting the mobile station device to start a random access procedure by activating a serving cell;
The mobile station apparatus includes a step of starting the random access procedure when the second serving cell in which information necessary for the random access procedure is set is activated. Transmission method. An integrated circuit for performing random access of a mobile station device in a communication system in which a base station device and a mobile station device are connected simultaneously to a plurality of serving cells to perform communication,
When the information required for the random access procedure is set from the base station device to the first serving cell that is not deactivated and one or more second serving cells that are activated or deactivated,
An integrated circuit, wherein the random access procedure is started when the second serving cell in which information necessary for the random access procedure is set is activated.