JP2013128201A - Communication system, base station device, relay station device, reception method, and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system which realizes mobility processing in consideration of a type of a relay, and to provide a base station device, a relay station device, a relay type notification method, and an integrated circuit.SOLUTION: A base station device notifies a relay station device of reception resource information in random access processing at handover, and the relay station device monitors a cell wireless network temporary identifier in the notified reception resource.

Description

  The present invention relates to a communication system, a base station apparatus, a relay station apparatus, a receiving method, and an integrated circuit, and more particularly to a communication system in which the relay station apparatus moves.

  The evolution of cellular mobile radio access and wireless networks (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) is the third generation partnership project (3rd Generation Partnership Project (3GPP). In LTE, an orthogonal frequency division multiplexing (OFDM) system, which is multicarrier transmission, is used as a wireless communication (downlink) communication system from a base station apparatus to a mobile station apparatus. Further, as a communication system for radio communication (uplink) from the mobile station apparatus to the base station apparatus, an SC-FDMA (Single-Carrier Frequency Division Multiple Access) system that is single carrier transmission is used.

  FIG. 8 is a diagram illustrating an example of a configuration of a radio frame in LTE. In FIG. 8, the horizontal axis direction represents the time axis, and the vertical axis direction represents the frequency axis. The radio frame is configured with, for example, a slot that is a set of 12 subcarriers (sc) in the frequency axis direction and a plurality of OFDM symbols in the time axis direction. An area serving as a unit of allocation divided by 12 subcarriers and 1 slot length is called a resource block. The subframe is composed of two slots, and the radio frame is composed of ten subframes. A plurality of resource blocks are continuously arranged in the frequency direction.

  In FIG. 8, in the # 0 and # 5 subframes, a primary synchronization channel (P-SCH) used by a mobile station device or a relay station device to synchronize with cells under the base station device, A secondary synchronization channel (S-SCH) and a physical broadcast information channel (PBCH) are included.

  The mobile station device uses the synchronization channel to synchronize with the cell and obtains a physical cell ID. Next, PBCH is demodulated to acquire main parameters such as the number of transmission antenna ports, and other broadcast information is allocated to a downlink shared channel (DL-SCH). Channel; D-BCH). The information included in the D-BCH is divided into a plurality of blocks according to the type of information, and is broadcast in units of units called system information blocks (SIBs) in individual cycles.

  An OFDM symbol in which a downlink control channel (Physical Downlink Control Channel: PDCCH) is arranged in the leading OFDM symbol of one subframe and PDCCH is arranged by a control format indication channel (Physical Control Format Indicator Channel: PCFICH). Specify a number.

  Further, a subframe includes a reference signal (DL-RS) required for demodulation and reception quality measurement. The subcarrier arrangement of the reference signal is uniquely determined by the above-described physical cell ID. When the mobile station apparatus measures the reception quality using the reference signal and compensates the propagation path for the PDCCH and detects data allocation addressed to the mobile station using the PDCCH, the mobile station apparatus demodulates the ODFM symbols after the PDCCH, Get data addressed to the station.

  In LTE, implementation of a multimedia broadcast / multicast service (MBMS) is under consideration. MBMS is assumed to provide a broadcast service for the same information in a wide area over a plurality of cells. A plurality of single frequency network (SFN) carriers are used in an area in order to reduce service interruption caused by frequency switching of mobile station apparatuses that move between cells in the MBMS transmission process. There is a mechanism of a multimedia broadcast single frequency network (MBSFN) that transmits the same MBMS in the cell.

  In LTE, in the subframe in which MBSFN transmission is performed, the arrangement of reference signals is different from that in other subframes, so that a problem occurs in processing in the mobile station apparatus. For this reason, a subframe for performing MBSFN transmission is broadcast in an information block called SIB2.

  Also, in LTE, a physical multicast channel (PMCH) is prepared for MBSFN transmission, and an information block of a subframe in which the PMCH is arranged is broadcasted by SIB 13 which is one of SIBs (Non-patent Document 1). . In LTE, since a plurality of MBSFN areas can be configured in one cell, an SIB 13 is notified of an identifier for identifying the MBSFN area and information on subframes used by the service of the identifier.

  Here, the subframes designated by SIB13 are not necessarily all subframes broadcast by SIB2. Subframes not specified by the SIB 13 can be used for purposes other than MBMS transmission. For example, the power consumption can be suppressed by not performing transmission, or it can be used for communication between a relay station device and a base station device by using the relay station device to be described later.

  In the case of the MBSFN subframe, the reference signal from the head to the 2 OFDM symbols has the same structure as a normal subframe. A PDCCH is also arranged. The remaining OFDM symbols are used for MBMS.

  As described above, in the MBSFN subframe in LTE, it is considered to perform PDCCH propagation path compensation and reception quality measurement using only the reference signal included in the 2 OFDM symbols from the beginning.

  Furthermore, in LTE, the use of a relay station device is being studied for the purpose of expanding the communicable range (coverage) of the mobile station device and increasing the communication capacity (capacity). The relay station apparatus communicates with the core network through a radio link (backhaul link) with a base station apparatus (DeNB) in a normal cell, and further, with the mobile station apparatus through a radio link (access link) with the mobile station apparatus. Communication. That is, the relay station device relays communication between the mobile station device and the base station device using the two radio links. In LTE, it is specified that the relay station apparatus can use the MBSFN subframe of the access link for backhaul link communication.

  FIG. 9 is a schematic diagram of a communication system including a relay station apparatus. In FIG. 9, base station apparatus Na is DeNB of relay station apparatus Ra. The relay station apparatus Ra sets an MBSFN subframe in a partial subframe of the access link, and receives a signal from Na using the MBSFN subframe. Further, mobile station apparatuses Ua and Ub are connected to relay station apparatus Ra, and signals destined for Ua and Ub are transmitted using subframes other than the MBSFN subframe.

  FIG. 10 shows processing when the relay station device is started. In FIG. 10, the start of the relay station apparatus is composed of two phases.

  In the first phase (phase 1), the relay station device is connected to the base station device as a normal mobile station device (step S1001), and communicates with OAM (operations, administration, maintenance) for maintenance and management of the relay station device. To acquire information related to the base station device serving as the DeNB (step S1002). Thereafter, the connection as the mobile station device is terminated (step S1003).

  In the next phase (phase 2), the relay station apparatus connects to the DeNB candidate base station apparatus as a relay station apparatus based on the information about the base station apparatus to be the DeNB (step S1004), and again through communication with the OAM. Setting for service start is performed (step S1005), an interface with the base station apparatus is established (step S1006), and a relay service is started (step S1008). Further, when establishing an interface with the relay station device, the base station device notifies the neighboring base station device and the control station device (MME) of the update of the cell information (step S1007).

  The relay station device operates by switching the backhaul link and the access link in the same frequency band, or operates by switching one transmission / reception unit even in the frequency band where the backhaul link and the access link are different. Thus, in addition to a relay station apparatus of a type that requires allocation of resources for the relay station apparatus (hereinafter referred to as a type A relay station apparatus) due to the aforementioned MBSFN subframe mechanism or the like, a plurality of transmission / reception units are provided. By using different frequency bands for the backhaul link and the access link, or by adjusting the direction of the antenna used for each link even if the backhaul link and the access link use the same frequency band, the backhaul link Of resources for relay station devices Needed to do the type of the relay station apparatus (hereinafter, referred to as type B relay station apparatus) is present.

  In addition, since the current relay station apparatus is assumed to be fixedly installed, a mechanism related to movement (mobility) such as handover as implemented in the mobile station apparatus is not defined.

3GPP TS 36.331, Radio Resource Control (RRC); Protocol specification. V10.2.0 (http://www.3gpp.org/ftp/Specs/html-info/36331.htm) R3-111219, Handover Procedures for Mobile RN (http://www.3gpp.org/ftp/tsg_ran/WG3_Iu/TSGR3_73bis/Docs/R3-112619.zip)

  As described above, the current relay station device does not define a mechanism related to mobility, but when the relay station device is mounted on a bus, a train, or the like, a malfunction occurs in the current state. For this reason, it is considered to introduce a mechanism related to mobility equivalent to the current mobile station apparatus.

  However, if the relay station apparatus is a type B relay station apparatus, the subframes that can be used for the backhaul link are not limited, and thus the current handover process mechanism of the mobile station apparatus can be diverted. When the station device is a type A relay station device, since the subframes that can be used for the backhaul link are limited, the current mobile station device handover process cannot be applied as it is, and is optimized for the relay station device. Processing is required.

  For this reason, Non-Patent Document 2 discloses that when the relay station apparatus moves between cells, a setting in consideration of the relay type is performed by performing the same process as the initial cell connection. Even when the relay station device resource setting is used, a lot of signaling is required for connection, which is inefficient.

  In view of the above problems, an object of the present invention is to provide a relay station device, a base station device, a communication system, a receiving method, and an integrated circuit that realize mobility processing in consideration of a relay type.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the communication system of the present application is a communication system in which a base station device and a relay station device communicate with each other, and the base station device notifies the relay station device of reception resource information in random access processing at the time of handover. The relay station apparatus monitors a cell radio network temporary identifier in the notified reception resource.

  (2) Further, in the communication system of the present application, the reception resource is either PDCCH or R-PDCCH.

  (3) The communication system of the present application is a communication system in which a base station device and a relay station device communicate with each other, and the relay station device relays a handover destination cell in response to a handover instruction from the base station device. A reception resource in a random access process at the time of handover is determined based on whether or not arrangement information of a downlink resource for a station device is included, and a cell radio network temporary identifier is monitored in the reception resource.

  (4) Further, the communication system of the present application is a communication system including a first base station device, a second base station device, and a relay station device, wherein the relay station device is configured to communicate with the first base station device during communication. The measurement report to be transmitted to the base station apparatus includes the relay type information for connecting to the adjacent cell included in the measurement report, and the first base station apparatus manages the handover destination cell. The relay type information is notified to a second base station apparatus, and the second base station apparatus transmits a reception resource of a random access preamble and a transmission resource of a random access response in a random access process at the time of handover to the relay The relay station apparatus determines the cell based on the type of the relay type information in the measurement report in response to the handover instruction from the base station apparatus. When a handover destination, and determines based on the received resources in the random access process at the time of handover in the relay type information, and wherein the monitoring cell radio network temporary identifier in the received resource.

  (5) In addition, the base station apparatus of the present application is a base station apparatus that communicates with a relay station apparatus, and the base station apparatus provides a reception resource in a random access process at the time of handover to the relay station apparatus. Information to be specified is included in the RRC connection reconfiguration message and transmitted.

  (6) Moreover, the relay station apparatus of this application is a relay station apparatus which communicates with a base station apparatus, and the said relay station apparatus contains the reception resource information in the random access process at the time of a handover from the said base station apparatus. An RRC connection reconfiguration message is received, and a cell radio network temporary identifier is monitored in the notified reception resource.

  (7) Moreover, the relay station apparatus of this application is a relay station apparatus which communicates with a base station apparatus, Comprising: The said relay station apparatus measures the adjacent cell, and relay type information in the case of connecting to the said adjacent cell And when the handover instruction from the base station apparatus is a handover instruction to the cell that has notified the relay type information by the measurement report, A reception resource in a random access process at the time of handover is set based on the relay type information, and a cell radio network temporary identifier is monitored in the reception resource.

  (8) Moreover, the base station apparatus of this application is a 2nd base station apparatus which communicates with a 1st base station apparatus and a relay station apparatus, Comprising: The said 2nd base station apparatus is with respect to the said relay station apparatus. Relay type information is received from the first base station apparatus, and based on the relay type information, a random access response transmission resource in a random access process at the time of handover to the relay station apparatus is determined, and the transmission resource is used. A response addressed to the relay station device is transmitted.

  (9) In addition, the reception method of the present application is a reception method of a relay station device that communicates with a base station device, and the relay station device receives reception resources in random access processing at the time of handover from the base station device. Receiving an RRC connection reconfiguration message including information, monitoring a cell radio network temporary identifier in the notified reception resource, and including a cell radio network temporary identifier addressed to the own station in the notified reception resource Receiving a control channel.

  (10) Further, the reception method of the present application is a reception method of a relay station device that communicates with a base station device, and the relay station device performs measurement of an adjacent cell and relays when connected to the adjacent cell A step of transmitting a measurement report including type information and an identifier of the neighboring cell to the base station apparatus, and a handover instruction from the base station apparatus is a handover instruction to a cell that has notified the relay type information by the measurement report. In some cases, a step of setting a reception resource in a random access process at the time of handover based on the relay type information, a step of monitoring a cell radio network temporary identifier in the set reception resource, A station for receiving a control channel including a temporary cell radio network identifier addressed to a station. Characterized in that it comprises a flop.

  (11) Further, the integrated circuit of the present application is an integrated circuit of a relay station apparatus that communicates with a base station apparatus, and the integrated circuit receives information on reception resources in random access processing at the time of handover from the base station apparatus. A function of receiving an RRC connection reconfiguration message including: a function of monitoring a cell radio network temporary identifier in the notified reception resource; and a control including a cell radio network temporary identifier addressed to the own station in the notified reception resource And a function of receiving a channel.

  (12) Further, the integrated circuit of the present application is an integrated circuit of a relay station apparatus that communicates with a base station apparatus, and the integrated circuit measures a neighboring cell and is connected to the neighboring cell. A function of transmitting a measurement report including information and an identifier of the neighboring cell to the base station apparatus, and a handover instruction from the base station apparatus is a handover instruction to a cell that has notified relay type information by the measurement report A function for setting a reception resource in random access processing at the time of handover based on the relay type information, a function for monitoring a cell radio network temporary identifier in the set reception resource, and a local station in the notified reception resource. And a function of receiving a control channel including a temporary cell radio network identifier And butterflies.

  According to the present invention, it is possible to provide a communication system, a base station apparatus, a relay station apparatus, a receiving method, and an integrated circuit that realize mobility processing considering the type of relay.

It is a block diagram which shows an example of the base station apparatus which concerns on embodiment of this invention. It is a block diagram which shows an example of the relay station apparatus which concerns on embodiment of this invention. It is the sequence chart which showed the handover procedure in the 1st Embodiment of this invention. It is the flowchart which showed an example of the monitoring resource setting procedure in the 1st Embodiment of this invention. It is the flowchart which showed another example of the monitoring resource setting procedure in the 1st Embodiment of this invention. It is the sequence chart which showed the handover procedure in the 2nd Embodiment of this invention. It is the flowchart which showed an example of the monitoring resource setting procedure in the 2nd Embodiment of this invention. It is a figure which shows an example of the frame structure of the conventional communication system. It is a figure which shows an example of the conventional communication system structure. It is the sequence chart which showed the starting procedure of the conventional relay station apparatus.

  Before describing an embodiment of the present invention, a physical channel related to the present invention will be described.

  A physical channel (or physical signal) used in LTE will be described. The physical channel includes a downlink channel in the downlink transmitted from the base station apparatus to the mobile station apparatus, and an uplink channel in the uplink transmitted from the mobile station apparatus to the base station apparatus. The physical channel may be added or changed in structure in LTE in the future, but even if it is changed, it does not affect the description of each embodiment of the present invention.

  Synchronization signals are composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately for each subcarrier, and the primary synchronization signal and the secondary synchronization signal signal. 504 types of cell identifiers (Physical Cell Identifiers; PCI) for identifying base station apparatuses and frame timing for radio synchronization are shown. The mobile station device and the relay station device specify the transmission timing (frame timing), the physical cell ID of the cell, and the like from the synchronization signal received by the cell search.

  The physical broadcast information channel (PBCH) is transmitted for the purpose of notifying control parameters (broadcast information (system information): System information) commonly used by mobile station apparatuses in the cell. The broadcast information not notified by the physical broadcast information channel is transmitted by a layer 3 message (system information) using the downlink data channel, with the radio resource notified by the downlink control channel. As broadcast information, a cell global identifier (Cell Global Identifier; CGI) indicating a cell-specific identifier, a class of accessible terminals, a tracking area identifier (Tracking Area Identifier; TAI) for managing a standby area by paging, and a cell frequency bandwidth And the correspondence relationship between downlink and uplink frequency bands, MBSFN subframes, MBSFN subframe allocation information used in the MBMS service, and the like. The mobile station device or relay station device in the idle state acquires the broadcast information from the cell detected by the cell search, and selects the optimum cell for the local station to communicate with.

  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, and the position and sequence of the signal are uniquely determined by the physical cell ID. The mobile station apparatus measures the reception quality (reception power, signal-to-interference noise ratio, etc.) for each cell by receiving the downlink reference signal. The mobile station apparatus also uses the downlink reference signal as a reference signal for demodulation of the downlink control channel or downlink data 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 downlink control channel (Physical Downlink Control Channel: PDCCH) is transmitted in some OFDM symbols from the head of each subframe, and radio resource allocation information according to the scheduling of the base station apparatus is transmitted to the mobile station apparatus. Used to indicate the amount of power increase / decrease adjustment. The mobile station apparatus monitors (monitors) the downlink control channel addressed to itself before transmitting / receiving the layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and By receiving the 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 at the time of reception.

  The downlink data channel (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 downlink data channel is indicated by the downlink control channel.

  There are also a downlink control channel and a downlink data channel for the relay station apparatus, which are referred to as R-PDCCH and R-PDSCH, respectively. Resources in which R-PDCCH and R-PDSCH are arranged are notified from the base station apparatus to the relay station apparatus using a relay station subframe setting message (RN-SubframeConfig) in the RRC layer. In the relay station subframe setting message, relay station apparatus downlink resources (R-PDCCH and R-PDSCH) arrangement (subframe) information, R-PDCCH type information, reference signal settings for demodulation, subframes R-PDSCH start OFDM symbol position information, information on the uplink control channel, and the like. Furthermore, in order to apply the same signaling mechanism as R-PDCCH and R-PDSCH to ordinary mobile station apparatuses, channels called E-PDCCH and E-PDSCH are also being studied.

  The uplink data channel (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 uplink data channel is indicated by the downlink control channel.

  The random access channel (Physical Random Access Channel; PRACH) is a channel used for notifying a preamble sequence and has a guard time. The random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus. The mobile station apparatus uses a random access channel for a request for scheduling transmission data when the uplink control channel is not set and a request for transmission timing adjustment information necessary for matching the uplink transmission timing with the reception timing window of the base station apparatus. . The mobile station apparatus that has received the transmission timing adjustment information sets an effective time of the transmission timing adjustment information, and manages the state as a transmission timing adjustment state during the effective time and as a transmission timing non-adjustment state outside the effective period. The base station device can also start random access by assigning a dedicated preamble sequence (Dedicated preamble) to the mobile station device.

  The multicast channel (Physical Multicast Channel; PMCH) is a channel used for transmission of multicast signals, and is a multicast control channel (MCCH) that is MBMS control information and a multicast traffic channel (MBCH traffic data that is MBMS traffic data). Multicast Traffic Channel (MTCH) transmission. The other physical channels are not directly related to the embodiments of the present invention, and thus detailed description thereof is omitted.

[First Embodiment]
A first embodiment of the present invention will be described below.

  FIG. 1 is a block diagram illustrating an example of a base station apparatus 1 according to an embodiment of the present invention. The base station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a control unit 104, a coding unit 105, a modulation unit 106, a transmission unit 107, a network signal transmission / reception unit 108, and an upper layer 109.

  Upper layer 109 outputs downlink traffic data and downlink control data to encoding section 105. The encoding unit 105 encodes each input data and outputs the encoded data to the modulation unit 106. Modulation section 106 modulates the signal input from encoding section 105. The signal modulated in the modulation unit 106 is multiplexed with a downlink reference signal and mapped as a frequency domain signal. Transmitter 107 converts the signal input from modulator 106 into a time-domain signal, places the converted signal on a carrier having a predetermined frequency, performs power amplification, and transmits the signal. A downlink data channel in which downlink control data is arranged typically forms a layer 3 message (RRC (Radio Resource Control) message).

  The receiving unit 101 converts a received signal from the relay station device 2 (see FIG. 2) or a mobile station device (not shown) into a baseband digital signal. The digital signal converted by the reception unit 101 is input to the demodulation unit 102 and demodulated. The signal demodulated by the demodulator 102 is then input to the decoder 103 and decoded. Decoding section 103 appropriately separates the received signal into uplink traffic data and uplink control data, and outputs the separated signals to higher layer 109, respectively.

  Base station apparatus control information necessary for controlling each of these blocks is input from the upper layer 109 to the control unit 104, and from the control unit 104, base station apparatus control information related to transmission is transmitted as transmission control information. The base station apparatus control information related to reception is appropriately input to each block of the reception unit 101, demodulation unit 102, and decoding unit 103 as reception control information in each block of the modulation unit 106 and transmission unit 107.

  On the other hand, the network signal transmitting / receiving unit 108 transmits or receives a control message between a plurality of base station apparatuses 1 (or control station apparatus (MME), gateway apparatus (Gateway), MCE) and the base station apparatus 1. . Control messages are transmitted and received via a network line. Control messages are exchanged on logical interfaces called S1 interface, X2 interface, M1 interface, and M2 interface.

  Further, the RRC unit of the base station apparatus 1 exists as part of the higher layer 109. In FIG. 1, the other components of the base 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 relay station apparatus 2 according to the embodiment of the present invention. The base station apparatus 1 includes a first reception unit 201, a first demodulation unit 202, a first decoding unit 203, a random access processing unit 204, a reception quality measurement unit 217, a first control unit 205, a first control unit 205, A coding unit 207, a first modulation unit 208, a first transmission unit 209, an upper layer 206, a second reception unit 210, a second demodulation unit 211, a second decoding unit 212, a second control unit 213, A second encoding unit 214, a second modulation unit 215, and a second transmission unit 216 are included.

  The relay station device 2 communicates with the base station device 1 through a backhaul link, and communicates with a mobile station device (not shown) through an access link.

  Upper layer 206 outputs Un uplink traffic data and Un uplink control data to first coding section 207 as backhaul link communication. Further, the upper layer 206 outputs information for performing random access processing to the random access processing unit 204. The first encoding unit 207 encodes each data input from the upper layer 206 and a signal for random access input from the random access processing unit 204, and outputs the encoded signal to the first modulation unit 208. First modulation section 208 modulates the signal input from encoding section 207. Also, in the first modulation section 208, the modulated signal is multiplexed with an uplink reference signal and mapped as a frequency domain signal. The first transmission unit 209 converts the signal input from the first modulation unit 208 into a time domain signal, places the converted signal on a carrier having a predetermined frequency, performs power amplification and transmits the signal.

  Also, the first receiving unit 201 converts the received signal from the base station apparatus 1 into a baseband digital signal. The digital signal converted by the first receiving unit 201 is input to the first demodulating unit 202 and demodulated. The signal demodulated by the first demodulator 202 is then input to the first decoder 203 and decoded. The first decoding unit 203 appropriately separates the received signal into Un downlink traffic data and Un downlink control data, and outputs each to the upper layer 206. In addition, information regarding the random access processing decoded by the first decoding unit 203 is input to the random access processing unit 204. The reception quality measurement unit 217 measures the reception quality calculated from the reception power such as the downlink reference signal and the synchronization signal detected by the first demodulation unit 202, and holds the received quality in pairs with the physical cell ID. The layer 206 is notified.

  Backhaul link control information necessary for control of each block related to these backhaul links is input from the upper layer 206 to the first control unit 205, and control information related to transmission is transmitted from the first control unit 205. As control information, each block of the random access processing unit 204, the first encoding unit 207, the first modulation unit 208, and the first transmission unit 209 includes control information related to reception as reception control information. The data is appropriately input to each block of the reception unit 201, the first demodulation unit 202, and the first decoding unit 203.

  Further, the upper layer 206 outputs Uu downlink traffic data and Uu downlink control data to the second encoding unit 214 as access link communication. The second encoding unit 214 encodes each data input from the higher layer and outputs the encoded data to the second modulation unit 215. The second modulation unit 215 modulates the signal input from the second encoding unit 214. Also, in the second modulation unit 215, the downlink reference signal is multiplexed with the modulated signal and mapped as a frequency domain signal. The second transmission unit 216 converts the signal input from the second modulation unit 215 into a time domain signal, places the converted signal on a carrier having a predetermined frequency, performs power amplification, and transmits the signal.

  The second receiving unit 210 converts the received signal from the mobile station apparatus into a baseband digital signal. The converted digital signal is input to the second demodulator 211 and demodulated. The signal demodulated by the second demodulator 211 is then input to the second decoder 212 and decoded. The second decoding unit 212 appropriately separates the received signal into Uu uplink traffic data and Uu uplink control data, and outputs each to the upper layer 206.

  Access link control information necessary for controlling each block related to these access links is input from the upper layer 206 to the second control unit 213, and control information related to transmission is transmitted from the second control unit 213 to the transmission control information. As the control information related to reception in each block of the second encoding unit 214, the second modulation unit 215, and the second transmission unit 216, the second reception unit 210, the second demodulation This is appropriately input to each block of the unit 211 and the second decoding unit 212. In FIG. 2, the other components of the base station apparatus 1 are omitted because they are not related to the present embodiment. Further, in FIG. 2, each processing unit used for transmission / reception of the backhaul link and each processing unit used for the access link may share a part or all of them. In this case, the backhaul link process and the access link process are performed in a time-sharing manner. Further, the random access processing unit 204 exists as part of a MAC (Medium Access Control) that manages the data link layer of the relay station device 2.

  Subsequently, a handover procedure of the relay station apparatus 2 in the communication system of the present embodiment will be described with reference to FIG. In addition, although this embodiment demonstrates the example in which the relay station apparatus 2 moves to the cell when the base station apparatus before handover (Source eNB) and the base station apparatus after handover (Target eNB) are different by handover, it is not limited to this. Alternatively, the present invention can be applied to movement between cells of the same base station apparatus. In this case, communication using the X2 interface between the base station apparatuses is not performed, and handover control closed by the base station apparatus alone is performed.

  In FIG. 3, first, the first base station apparatus 1 notifies the second base station apparatus 1 of a handover request message of the relay station apparatus 2 (step S31). Here, the handover request message may be a message dedicated to the relay station device or a message for an existing base station device (HANDOVER REQUEST). The handover request message includes information related to the communication capability of the relay station apparatus 2, network resource allocation information, and radio resource allocation information. The second base station apparatus 1 that has received the handover request message in step S31 notifies the handover request approval message to the first base station apparatus 1 when the handover is approved (step S32). Here, the handover request approval message may be a message dedicated to the relay station apparatus, a diversion of an existing message for the base station apparatus (HANDOVER REQUEST ACK), or may be composed of a plurality of messages. In the handover request approval message, downlink resources (PDCCH and PDSCH) for the mobile station apparatus are used as reception resources for a random access response, which will be described later, or downlink resources for the relay station apparatus (R-PDCCH and R-PDSCH) are used. Information that can identify whether to use and subframe information in which downlink resources for relay station devices are arranged are included.

  The first base station apparatus 1 relays information on random access preamble transmission resources (preamble transmission resource information (PRACH Mask Index), preamble number (Preamble Index), etc.), reception resource information of the random access response, and a handover destination cell. An RRC connection reconfiguration message including a cell radio network temporary identity (C-RNTI) assigned to the station apparatus 2 is notified to the relay station apparatus 2 and the handover is instructed to the relay station apparatus. (Step S33). Here, the RRC connection reconfiguration message may be a message dedicated to the relay station apparatus or a message for the existing mobile station apparatus (RRCConnectionReconfiguration). Further, the RRC connection reconfiguration message may include the relay resource link downlink resource arrangement information of the second base station apparatus 1. At this time, when the relay station apparatus downlink resource arrangement information notified from the second base station apparatus 1 is different from the relay station apparatus downlink resource arrangement information currently allocated to the relay station apparatus 2 May be notified only, or may always be notified. Further, when the relay station device 2 is a type B relay station device, there is no need to notify, but a notification is made to explicitly allocate the relay station device downlink resource (act as a type A relay station device). May be.

  The relay station device 2 that has received the RRC connection reconfiguration message sets a resource for monitoring the cell radio network temporary identifier for extracting the message addressed to itself based on the received resource information of the random access response (step S34). ).

  Here, a specific example of the resource setting for monitoring the cell radio network temporary identifier in step S34 will be described with reference to the flowcharts of FIGS.

  First, in FIG. 4, the relay station device 2 confirms the RRC connection reconfiguration message, and whether the downlink resource for the relay station device is designated as a random access response reception resource (control channel for monitoring the cell radio network temporary identifier). (R-PDCCH is specified) in step S41. If the downlink resource for relay station apparatus is not specified in step S41, the resource (control channel) for monitoring the cell radio network temporary identifier is set in the PDCCH (step S46), and the process is terminated.

  If the relay station device downlink resource is specified in step S41, it is determined whether the relay station subframe setting is included in the RRC connection reconfiguration message (step S42). When there is no relay station subframe setting instruction in step S42, the relay station apparatus downlink resource allocation is set so as to monitor the R-PDCCH (step S45), and the process ends.

  When there is a relay station subframe setting instruction in step S42, the relay station apparatus downlink resource arrangement set by the setting instruction is compared with the currently set relay station apparatus downlink resource arrangement (step S43). . When arrangement | positioning is the same by step S43, it changes to step S45, sets it to monitor R-PDCCH by arrangement | positioning of the downlink resource for relay stations apparatus currently set, and complete | finishes a process.

  When the arrangement is different in step S43, the relay station device 2 changes the subframe setting of the backhaul link based on the instructed relay station subframe setting, and further changes the MBSFN subframe setting of the access link as necessary. Then, the subordinate mobile station apparatus is notified of the change (step S44). Next, the relay station apparatus 2 transits to step S45, sets the R-PDCCH to be monitored with the newly set relay resource apparatus downlink resource arrangement, and ends the process.

  When there is a relay station subframe setting instruction in step S42, the relay station device 2 may execute the process of step S44 without comparing the arrangement in step S43.

  As another example, in FIG. 5, the relay station apparatus 2 confirms the RRC connection reconfiguration message, and determines whether the relay station apparatus downlink resource is specified as the reception resource of the random access response (step S51). . When the relay station device downlink resource is not specified in step S51, the resource for monitoring the cell radio network temporary identifier is set in the PDCCH (step S57), and the process is terminated.

  If the relay station device downlink resource is specified in step S51, it is determined whether the relay station subframe setting is included in the RRC connection reconfiguration message (step S52). If there is no relay station subframe setting instruction in step S52, the relay station apparatus downlink resource allocation is set to monitor the R-PDCCH (step S55), and the process ends.

  If there is a relay station subframe setting instruction in step S52, the arrangement of the relay station apparatus downlink resource set by the setting instruction is compared with the relay station apparatus downlink resource arrangement that is currently set (step S53). . If there is a common arrangement (common subframe) between both in step S43, the R-PDCCH is set to be monitored in the common subframe (step S56), and the process ends.

  If there is no common subframe in step S43, the relay station apparatus 2 changes the subframe setting of the backhaul link based on the instructed relay station subframe setting, and further sets the MBSFN subframe of the access link as necessary. And the subordinate mobile station apparatus is notified of the change (step S54).

  Next, the relay station apparatus 2 transits to Step S55, sets the R-PDCCH to be monitored with the newly set downlink resource for relay station apparatus, and ends the process.

  Returning to the description of FIG. 3, the relay station apparatus 2 that has set the resource for monitoring the cell radio network temporary identifier in step S34 uses the allocated preamble transmission resource to perform random access corresponding to the designated preamble number. A preamble is transmitted (step S35).

  When the second base station apparatus 1 detects the random access preamble from the relay station apparatus 2, the second base station apparatus 1 calculates the amount of transmission timing shift from the relay station apparatus 2 to the second base station apparatus 1 from the reception timing of the random access preamble. calculate.

  Next, the second base station apparatus 1 is a cell radio network for indicating a response (random access response) addressed to the relay station apparatus 2 based on the received resource information of the random access response notified to the first base station apparatus 1 A temporary identifier is arranged in either PDCCH or R-PDCCH, and a random access response message including transmission timing adjustment information based on the timing deviation amount is sent to a control channel (PDCCH in which the cell radio network temporary identifier is arranged. Alternatively, it is arranged and transmitted on a data channel (PDSCH or R-PDSCH) indicated by R-PDCCH) (step S36).

  Here, when the second base station apparatus 1 uses the downlink resource for the relay station apparatus, the arrangement information of the downlink resource for the relay station apparatus notified from the first base station apparatus 1 is the second base station. R-PDCCH and R-PDSCH are arranged in the common subframe when different from the arrangement information of the relay station apparatus downlink resource set in the station apparatus 1.

  For example, the downlink resources for the relay station apparatus of the first base station apparatus 1 are the subframe numbers # 2, # 3, and # 7 in FIG. 8, and the downlink resources for the relay station apparatus of the second base station apparatus 1 Are subframe numbers # 2, # 7, and # 8, R-PDCCH and R-PDSCH are arranged in either subframe number # 2 or # 7. If there is no common subframe, it is placed in one of the relay resources for the relay station device set in the second base station device 1.

  The relay station apparatus 2 monitors the cell radio network temporary identifier included in the control channel (PDCCH or R-PDCCH) with the resource set in step S34, and detects that there is a cell radio network temporary identifier assigned to the own station. Then, the content of the random access response message arranged in the data channel (PDSCH or R-PDSCH) designated by the control channel is confirmed, and the uplink timing is transmitted using the transmission timing adjustment information included in the random access response message. Adjust the transmission timing.

  When the connection to the handover destination cell is successful, the relay station apparatus 2 transmits an RRC connection reconfiguration completion message in the cell in which the connection is successful (step S37). Here, the RRC connection reconfiguration completion message may be a message dedicated to the relay station device or a message for the existing mobile station device (RRCConnectionReconfigurationComplete).

  Here, when the relay station apparatus 2 is set to monitor the R-PDCCH in the common subframe in step S56 of FIG. 5, the relay station sub that has been notified after the connection to the cell is successful. The subframe setting of the backhaul link may be changed based on the frame setting, the MBSFN subframe setting of the access link may be changed as necessary, and the change may be notified to the subordinate mobile station apparatus.

  The second base station apparatus 1 that has received the RRC connection reconfiguration completion message notifies the first base station apparatus 1 of the completion of handover (step S38). Also, the second base station apparatus 1 assigns resources to the relay station apparatus 2 after the handover is completed. Here, the handover completion message may be a message dedicated to the relay station device or a message for an existing base station device (HANDOVER COMPLETE).

  As described above, the relay station apparatus 2 determines the backhaul link subframe and random access processing at the time of handover based on the relay type and the arrangement of the downlink resource for the relay station apparatus in the handover source and handover destination cells. The second base station apparatus 1 that sets the resources to be used for managing the handover destination cell is based on the relay station subframe setting of the own station and the relay station subframe setting of the first base station apparatus 1, By setting the resource for receiving the random access preamble, the control information including the cell radio network temporary identifier, and the resource for arranging the random access response message, it is possible to reduce the subframe reset process at the time of handover.

  In this embodiment, the downlink resource allocation information for the relay station device of the handover destination cell is included in the handover request approval message and notified to the base station device of the handover source cell. The information may be exchanged between base station apparatuses using a message.

  In the present embodiment, the resource for monitoring the cell radio network temporary identifier is set in the RRC connection reconfiguration message based on the received resource information of the random access response. However, the present invention is not limited to this. For example, in the RRC connection reconfiguration message It is set to monitor the R-PDCCH when the relay station apparatus downlink resource arrangement information is included, and when the relay station apparatus downlink resource arrangement information is not included, the PDCCH is monitored. It may be set. That is, the determination may be made based on the presence / absence of the relay station apparatus resource arrangement information without clearly indicating the resource for monitoring the cell radio network temporary identifier.

  Further, in this embodiment, when the arrangement of the downlink resources for the relay station apparatus at the handover source and the handover destination is different, the handover process for monitoring the cell radio network temporary identifier using the PDCCH is performed. If the arrangement of the downlink resources for relay station apparatuses is different, the phase 2 cell connection process shown in FIG. 10 may be performed. That is, when there are subframes in which the handover source and handover destination relay resource device downlink resource arrangement is the same or common, the handover process is performed, otherwise the conventional cell connection process is performed. Also good.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described. In the first embodiment, the example in which the information for setting the resource for monitoring the cell radio network temporary identifier is included in the RRC connection reconfiguration message is shown, but in this embodiment, another example is shown.

  Since the configuration of the communication system (base station apparatus 1 and relay station apparatus 2) used in the description of the present embodiment is the same as that of the first embodiment, the description thereof is omitted. Also, messages used for communication can use new messages or divert existing messages as in the first embodiment.

  A handover procedure of the relay station apparatus 2 in the communication system of this embodiment will be described with reference to FIG.

  In FIG. 6, first, the relay station device 2 performs adjacent cell measurement according to the settings (frequency to be reported, cell ID, event condition of measurement result report, etc.) notified from the first base station device 1 in advance (steps) S601).

  Next, when the event condition is satisfied, the relay station apparatus 2 includes a measurement result that matches the report condition in the measurement report that is a layer 3 message, and transmits the measurement result to the first base station apparatus 1 (step S602). The measurement report is, for example, a measurement report of a layer 3 message. The measurement report includes at least a measured cell identifier and a relay type when the relay station device 2 is connected to the cell (whether or not a relay station device downlink resource is required when the cell is a DeNB). Contains information. The relay type information may be notified only when there is a change from the current relay type or when the relay type is different from the default relay type.

  The first base station apparatus 1 that has received the measurement report determines the necessity of handover and the handover destination based on the measurement report (step S603). When it is determined that a handover is necessary, the first base station apparatus 1 makes a handover request from the relay station apparatus 2 to the base station apparatus 1 (in this case, the second base station apparatus 1) that manages the handover destination candidate cell. A message is notified (step S604). The handover request message includes the relay resource device downlink resource arrangement information of the first base station device 1 and the relay type information reported from the relay station device 2.

  The second base station apparatus 1 that has received the handover request message notifies the first base station apparatus 1 of the handover request approval message when approving the handover (step S605). The handover request approval message may include the relay resource device downlink resource arrangement information of the second base station device 1.

  The first base station apparatus 1 is a cell radio network assigned to the relay station apparatus 2 in information related to random access preamble transmission resources (preamble transmission resource information (PRACH Mask Index), preamble number (Preamble Index), etc.) and handover destination cell. An RRC connection reconfiguration message including a temporary identifier is notified to the relay station apparatus 2 and a handover is instructed to the relay station apparatus (step S606).

  Further, the RRC connection reconfiguration message may include the arrangement information of the downlink resource for the relay station device of the second base station device 1. At this time, when the relay station apparatus downlink resource arrangement information notified from the second base station apparatus 1 is different from the relay station apparatus downlink resource arrangement information currently allocated to the relay station apparatus 2 May be notified only, or may always be notified. Further, when the relay station device 2 is a type B relay station device, there is no need to notify, but a notification is made to explicitly allocate the relay station device downlink resource (act as a type A relay station device). May be.

  The relay station apparatus 2 that has received the RRC connection reconfiguration message monitors a cell radio network temporary identifier for extracting a message addressed to itself based on the handover destination cell identifier included in the RRC connection reconfiguration message. Is set (step S607).

  Here, an example of specific resource setting in step S607 will be described with reference to the flowchart of FIG.

  First, in FIG. 7, the relay station apparatus 2 confirms the RRC connection reconfiguration message and determines whether a relay station subframe setting instruction is included (step S71).

  If the setting instruction is not included in step S71, it is determined whether the relay type when connected to the cell has been notified in the previous measurement report (step S72). If it has been notified in advance in step S72 that the relay station apparatus is a type B relay station apparatus, a resource (control channel) for monitoring the cell radio network temporary identifier is set in the PDCCH (step S73), and the process is terminated.

  If not notified in step S72 or if it has been notified that it will be a type A relay station device, it is set to monitor the R-PDCCH with the currently set relay station device resource arrangement. (Step S74), the process ends.

  When the setting instruction is included in step S71, the arrangement of the downlink resource for relay station apparatus set by the setting instruction is compared with the arrangement of the downlink resource for relay station apparatus currently set (step S75). If there is a common arrangement (common subframe) between both in step S75, the R-PDCCH is set to be monitored in the common subframe (step S77), and the process ends.

  If there is no common subframe in step S75, the relay station apparatus 2 changes the subframe setting of the backhaul link based on the instructed relay station subframe setting, and further sets the MBSFN subframe setting of the access link as necessary. And the subordinate mobile station apparatus is notified of the change (step S76).

  Next, the relay station apparatus 2 transits to Step S74, sets the R-PDCCH to be monitored with the newly set downlink resource for relay station apparatus, and ends the process.

  Returning to the description of FIG. 6, the relay station apparatus 2 that has set the resource for monitoring the cell radio network temporary identifier in step S <b> 607 uses the allocated preamble transmission resource to perform random access corresponding to the designated preamble number. A preamble is transmitted (step S608).

  When the second base station apparatus 1 detects the random access preamble from the relay station apparatus 2, the second base station apparatus 1 calculates the amount of transmission timing shift from the relay station apparatus 2 to the second base station apparatus 1 from the reception timing of the random access preamble. calculate.

  Next, the second base station apparatus 1 is addressed to the relay station apparatus 2 on the basis of the relay type information notified from the first base station apparatus 1 and the relay station apparatus resource arrangement information of the first base station apparatus 1. A random access response message including a transmission timing adjustment information based on the amount of timing deviation is arranged in either the PDCCH or the R-PDCCH. It arrange | positions and transmits on the data channel (PDSCH or R-PDSCH) instruct | indicated by the control channel (PDCCH or R-PDCCH) by which the said cell radio network temporary identifier is arrange | positioned (step S609).

  Here, when the second base station apparatus 1 uses the downlink resource for the relay station apparatus, the arrangement information of the downlink resource for the relay station apparatus notified from the first base station apparatus 1 is the second base station. R-PDCCH and R-PDSCH are arranged in the common subframe when different from the arrangement information of the relay station apparatus downlink resource set in the station apparatus 1.

  For example, the downlink resources for the relay station apparatus of the first base station apparatus 1 are the subframe numbers # 2, # 3, and # 7 in FIG. 8, and the downlink resources for the relay station apparatus of the second base station apparatus 1 Are subframe numbers # 2, # 7, and # 8, R-PDCCH and R-PDSCH are arranged in either subframe number # 2 or # 7. If there is no common subframe, it is placed in one of the relay resources for the relay station device set in the second base station device 1.

  The relay station apparatus 2 monitors the cell radio network temporary identifier included in the control channel (PDCCH or R-PDCCH) using the resource set in step S607, and detects that there is a cell radio network temporary identifier assigned to the own station. Then, the content of the random access response message arranged in the data channel (PDSCH or R-PDSCH) designated by the control channel is confirmed, and the uplink timing is transmitted using the transmission timing adjustment information included in the random access response message. Adjust the transmission timing.

  When the connection to the handover destination cell is successful, the relay station apparatus 2 notifies the RRC connection reconfiguration completion message in the cell in which the connection is successful (step S610).

  Here, when the relay station apparatus 2 is set to monitor the R-PDCCH in the common subframe in step S77 in FIG. 7, the relay station subframe that has been notified after the connection to the cell is successful. The subframe setting of the backhaul link may be changed based on the setting, the MBSFN subframe setting of the access link may be changed as necessary, and the change may be notified to the subordinate mobile station apparatus.

  Receiving the RRC connection reconfiguration completion message, the second base station apparatus 1 notifies the first base station apparatus 1 of the completion of handover (step S611). Also, the second base station apparatus 1 assigns resources to the relay station apparatus 2 after the handover is completed.

  As described above, the relay station apparatus 2 uses the relay type information in the handover destination candidate cell notified to the first base station apparatus 1 in advance and the relay station subframe setting notified from the first base station apparatus 1. The second base station apparatus 1 that sets the relay type after handover and the resource for monitoring the cell radio network temporary identifier and manages the handover destination cell is notified by the first base station apparatus 1 Based on the relay type of the station apparatus 2 and the relay station subframe setting, the resource for receiving the random access preamble and the resource for arranging the control information including the cell radio network temporary identifier and the random access response message are set. Efficient by reducing subframe reconfiguration processing and signaling It is possible to realize a handover process.

  As described above, the embodiments according to the present invention have been described. However, with regard to the relay station apparatus and the base station apparatus according to the present invention, functions of each unit of the base station apparatus or a program for realizing a part of these functions are described. The control shown in each embodiment may be performed by recording in a computer-readable recording medium, reading the program recorded in the recording medium into a computer system, and executing the program. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” dynamically holds a program 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 also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. 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.

  Each functional block used in each of the above embodiments may be realized as an LSI that is typically an integrated circuit. Each functional block may be individually formed into chips, 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.

  Further, in each of the embodiments described above, it has been described that the DeNB of the relay station apparatus is the base station apparatus. However, the present invention is not limited thereto, and the relay station apparatus may be a DeNB instead of the base station apparatus. It is. In this case, the relay station device is connected to the relay station device. Further, instead of C-RNTI, random access response identification information (Random Access-Radio Network Temporary Identity; RA-RNTI) can be used.

  Moreover, although each said embodiment demonstrated the handover process at the time of using the interface (X2 interface) between base station apparatuses, it is not restricted to this, The handover process via MME using S1 interface instead of X2 interface May be performed. In this case, it is not a direct communication between base station apparatuses, but a handover process through the MME of each base station apparatus.

  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 ... Base station apparatus 2 ... Relay station apparatus 101,201,210 ... Receiving part 102,202,211 ... Demodulation part 103,203,212 ... Decoding part 104,205,213 ... Control part 105,207,214 ... Encoding part 106, 208, 215 ... Modulation units 107, 209, 216 ... Transmission unit 108 ... Network signal transmission / reception units 109, 206 ... Upper layer 204 ... Random access processing unit 217 ... Reception quality measurement unit

Claims (12)

A communication system in which a base station device and a relay station device communicate with each other,
The base station apparatus notifies the relay station apparatus of reception resource information in random access processing at the time of handover,
The relay station apparatus monitors a cell radio network temporary identifier in the notified reception resource. The communication system according to claim 1, wherein the reception resource is either PDCCH or R-PDCCH. A communication system in which a base station device and a relay station device communicate with each other,
The relay station apparatus determines the reception resource in the random access processing at the time of handover based on whether or not the handover instruction from the base station apparatus includes arrangement information of the downlink resource for the relay station apparatus of the handover destination cell. A communication system comprising: determining and monitoring a cell radio network temporary identifier in the reception resource. A communication system including a first base station device, a second base station device, and a relay station device,
The relay station apparatus transmits a measurement report transmitted to the first base station apparatus in communication, including relay type information when connecting to an adjacent cell included in the measurement report,
The first base station apparatus notifies the relay type information to a second base station apparatus that manages a handover destination cell,
The second base station apparatus determines, based on the relay type, a random access preamble reception resource and a random access response transmission resource in a random access process at the time of handover,
The relay station apparatus determines, based on the relay type information, a reception resource in random access processing at the time of handover when a cell that has notified relay type information in a measurement report is a handover destination in a handover instruction from the base station apparatus. A communication system comprising: determining and monitoring a cell radio network temporary identifier in the reception resource. A base station device that communicates with a relay station device,
The base station apparatus transmits information specifying a reception resource in a random access process at the time of handover included in an RRC connection reconfiguration message to the relay station apparatus. A relay station device that communicates with a base station device,
The relay station apparatus receives an RRC connection reconfiguration message including reception resource information in a random access process at the time of handover from the base station apparatus, and monitors a cell radio network temporary identifier in the notified reception resource. A relay station device characterized. A relay station device that communicates with a base station device,
The relay station apparatus performs measurement of an adjacent cell, and transmits a measurement report including relay type information and an identifier of the adjacent cell when connected to the adjacent cell to the base station apparatus,
When the handover instruction from the base station apparatus is a handover instruction to a cell that has notified the relay type information by the measurement report, a reception resource in a random access process at the time of handover is set based on the relay type information, A relay station apparatus characterized by monitoring a cell radio network temporary identifier in a reception resource. A second base station apparatus that communicates with the first base station apparatus and the relay station apparatus,
The second base station apparatus receives relay type information for the relay station apparatus from the first base station apparatus,
Based on the relay type information, a random access response transmission resource in a random access process at the time of handover to the relay station apparatus is determined, and a response addressed to the relay station apparatus is transmitted using the transmission resource. Base station device. A reception method for a relay station apparatus that communicates with a base station apparatus,
The relay station device
Receiving from the base station device an RRC connection reconfiguration message including information on reception resources in random access processing during handover;
Monitoring a cell radio network temporary identifier in the notified reception resource;
Receiving the control channel including the cell radio network temporary identifier addressed to the own station in the notified reception resource. A reception method of a relay station device that communicates with a base station device,
The relay station device
Measuring a neighboring cell and transmitting a measurement report including relay type information and an identifier of the neighboring cell when connected to the neighboring cell to the base station device;
When the handover instruction from the base station apparatus is a handover instruction to a cell that has notified the relay type information by the measurement report, setting a reception resource in random access processing at the time of handover based on the relay type information; ,
Monitoring a cell radio network temporary identifier in the set reception resource;
Receiving the control channel including the cell radio network temporary identifier addressed to the own station in the notified reception resource. An integrated circuit of a relay station device that communicates with a base station device,
The integrated circuit comprises:
A function of receiving, from the base station apparatus, an RRC connection reconfiguration message including information on reception resources in random access processing at the time of handover;
A function of monitoring a cell radio network temporary identifier in the notified reception resource;
An integrated circuit comprising: a function of receiving a control channel including a cell radio network temporary identifier addressed to the local station in the notified reception resource. An integrated circuit of a relay station device that communicates with a base station device,
The integrated circuit comprises:
A function of measuring a neighboring cell and transmitting a measurement report including relay type information when connected to the neighboring cell and an identifier of the neighboring cell to the base station device;
A function for setting a reception resource in random access processing at the time of handover based on the relay type information when a handover instruction from the base station apparatus is a handover instruction to a cell that has notified the relay type information by the measurement report; ,
A function of monitoring a cell radio network temporary identifier in the set reception resource;
An integrated circuit comprising: a function of receiving a control channel including a cell radio network temporary identifier addressed to the local station in the notified reception resource.