JP2010212981A - Relay station device, mobile station device, base station device, and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alleviate interference with another cell even when a relay station device using MIMO is arranged at a cell end, in a radio communication system. <P>SOLUTION: The relay station device 200 is connected to one of base stations for annunciating a shared ID (identifier) in a plurality of cells, and includes a reference signal generation part 207. The reference signal generation part 207 includes: an up reference signal ID holding part for holding the shared ID annunciated from the base station device as an up reference signal ID; a physical cell ID replacement part for resetting a physical cell ID of the base station device to the value of the up reference signal ID; and an up reference signal generation part for generating an up reference signal using the physical cell ID replaced by the physical cell ID replacement part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a base station apparatus, a relay station apparatus, a mobile station apparatus, and a communication system using the base station apparatus, the relay station apparatus, and / or the mobile station apparatus that perform communication using a multicarrier communication system. About.

  3rd Generation (3G) wireless access system evolution (Evolved Universal Terrestrial Radio Access; hereinafter referred to as “EUTRA”) and 3G network evolution (Evolved Universal Terrestrial Radio Access Network) Hereinafter referred to as “EUTRAN”) is being studied in 3GPP (3rd Generation Partnership Project).

  In 3GPP, the fourth generation (4G) of cellular mobile communication (hereinafter referred to as “4G”) radio access scheme (Advanced EUTRA; hereinafter referred to as “A-EUTRA” or “LTE-A”) and 4G The study of the network (Advanced EUTRAN; also called “A-EUTRAN”) has started. In A-EUTRA, the introduction of relay stations and communication using more transmission / reception antennas than the number of antennas used in EUTRA are being studied, and backward compatibility with EUTRA is also regarded as important.

  In EUTRA and A-EUTRA, adopting an OFDMA (Orthogonal Frequency Division Multiplexing Access) scheme that is resistant to multipath interference and suitable for high-speed transmission is being studied as a downlink communication scheme.

  FIG. 10 is a diagram illustrating an example of a configuration of a downlink radio frame in EUTRA. In FIG. 10, the radio frame 1000 is shown with the time axis on the horizontal axis and the frequency axis on the vertical axis. The radio frame 1000 is configured with a frequency axis as 12 subcarriers (sc) and a time axis as a unit of a slot that is a set of a plurality of OFDM symbols, and a region divided by 12 subcarriers and 1 slot length is defined as a resource block. Call. A group of two slots is called a subframe, and a group of ten subframes is called a frame. A plurality of resource blocks are continuously arranged in the frequency direction, and 100 resource blocks are arranged in the BW = 20 MHz bandwidth. At both ends, guard bands to which signals are not transmitted are arranged in order to prevent radiation to adjacent bands.

  As shown by legend 1001 in FIG. 10, the # 0 and # 5 subframes include a primary synchronization channel (P-SCH), a secondary synchronization channel (S-SCH), and a primary broadcast information channel ( P-BCH). The mobile station apparatus establishes slot synchronization by taking a correlation in the time domain between a received signal and a plurality of P-SCH replica signals (first step). The mobile station apparatus further correlates the received signal and a plurality of S-SCH replica signals in the time domain or frequency domain, and establishes frame synchronization based on the obtained S-SCH sequence and detects it first. The physical cell ID (Identification) Nid (0 ≦ Nid ≦ 503) for identifying the base station apparatus is specified together with the P-SCH sequence (second step). The two steps consisting of the first and second steps are called a cell search procedure. At the time of subsequent connection, main parameters such as the number of transmission antenna ports are acquired by demodulating the P-BCH, and other broadcast information is allocated to the downlink shared channel (DL-SCH). Acquired from (D-BCH). Information included in the D-BCH is divided into a plurality of blocks depending on the type of information, and is broadcast in individual cycles in units called SIBs (System Information Blocks).

  In addition, a variable length (1 to 4 OFDM symbols) downlink control signal (PDCCH) is included at the head of each subframe. The number of OFDM symbols used for PDCCH is determined by a signal called PCFICH.

  Further, although not shown, each resource block includes a reference signal (DL-RS) necessary for demodulation and reception quality measurement. The subcarrier arrangement of the reference signal is uniquely determined by the physical cell ID.

  The mobile station apparatus performs reception quality measurement and PDCCH propagation path compensation using the reference signal, and when there is data allocation to the local station in the PDCCH, the mobile station apparatus demodulates the ODFM symbols after the PDCCH and transmits data to the local station. To get.

  A relay station (RN: Relay Node) that is being studied for introduction in A-EUTRA is a communication system between a parent base station (MeNB: Master eNodeB) and A-EUTRA as well as a mobile station device (UE: User Equipment). Accordingly, a method of wirelessly transmitting a transmission / reception signal to / from a mobile station apparatus is considered. That is, the MeNB transmits a signal to the mobile station device using a part of the MeNB's A-EUTRA resource to the RN (this is called a relay link), and the RN is addressed to the UE received from the MeNB. Is transferred to the UE (this is called an access link).

  Conversely, uplink data from the UE is received by the RN on the access link and transferred from the RN to the MeNB using the relay link.

  Here, since the relay link is used exclusively for communication between the MeNB and the RN, it can be considered that a resource block structure or subframe structure incompatible with EUTRA is obtained. In this case, since the EUTRA UE cannot receive the resource block or subframe, there is a problem in backward compatibility.

  For this reason, proposals have been made to avoid the problem by using the MBSFN subframe of a service called MBMS described below.

  In A-EUTRA, implementation of a multimedia broadcast / multicast service (MBMS) is under consideration. Since MBMS is supposed to perform the same broadcast service in a wide area over a plurality of cells, a single frequency network (SFN) is used to reduce service interruption due to frequency switching between cells during the MBMS transmission process. An MBSFN mechanism for transmitting MBMS using a carrier of a single frequency network has already been studied at the specification stage of EUTRA.

  In EUTRA, a physical multicast channel PMCH (Physical Multicast Channel) is prepared for MBSFN transmission, and information on subframes in which the PMCH is arranged is broadcasted by SIB2 which is one of SIBs (for example, non-patent literature). 1).

  In PMCH, a reference signal from the beginning to 2 OFDM symbols is transmitted in the same structure as normal transmission. A PDCCH is also arranged. Although the remaining symbols are used for MBMS, since EUTRA does not perform MBMS, the EUTRA mobile station apparatus ignores the remaining symbols (see, for example, Non-Patent Document 2).

  Therefore, in the MBSFN subframe, the EUTRA mobile station apparatus performs PDCCH propagation path compensation and reception quality measurement using only the reference signal included in the 2 OFDM symbols from the beginning.

  In Non-Patent Document 5, in order to provide the backward compatibility, a proposal has been made to use the MBSFN subframe for communication between the relay station and the base station. That is, it is stated that signals other than the PDCCH in the MBSFN subframe are ignored by the EUTRA mobile station apparatus, and the OFDM symbols other than the PDCCH can be diverted for the purpose of communication between the MeNB and the RN.

  In Non-Patent Document 3, it is agreed to introduce a hierarchical notification mechanism for MBSFN. First, the position of the primary multicast control channel (P-MCCH) is acquired from BCCH (broadcast information channel transmitted on D-BCH). When the secondary multicast control channel (S-MCCH) exists in the P-MCCH, the location information of the S-MCCH is included. Further, in a cell in which a plurality of MBSFN areas are overlapped, each MBSFN area information can be broadcast using a plurality of S-MCCHs.

  Further, in Non-Patent Document 4, when there are a plurality of MBMS service areas, a subframe to be used for each SFA is specified using an SFA ID (Single Frequency Network Area Identify) that is an identifier of each service area. The method is being studied. For example, in the frame 1100 illustrated in FIG. 11, an S-MCCH is prepared for each SFA ID indicated by the legend 1101, and the position of each S-MCCH is reported by the P-MCCH. Each S-MCCH corresponds to an SFA ID, and the subframe position specified by each S-MCCH is used for the MBMS of the corresponding SFA ID.

  Next, in the uplink of EUTRA, an SC-FDMA (Single Carrier Frequency Division Multiple Access) system having excellent peak-to-average power ratio (PAPR) characteristics is adopted as an access system.

  As in the case of the downlink 1200 shown in FIG. 12, the uplink frame configuration is 1 subframe with 2 slots with 1 slot 0.5 [ms] as a basic unit, and 1 frame with 10 subframes. Yes. One slot is usually composed of seven SC-FDMA symbols.

  Although not shown in FIG. 12, a reference signal for demodulation is included in one slot (7 symbols). As a reference signal for this demodulation, a Zadoff-Chu sequence which is basically a kind of CAZAC (Constant Amplitude Zero Auto-Correlation) sequence is used. However, when the resource band allocated to the mobile station apparatus is narrow, another sequence is used. This Zadoff-Chu sequence has a feature that an autocorrelation value is 0, and when the sequence length is a prime number, a sequence having (sequence length-1) low cross-correlation values can be generated. Therefore, the uplink reference signal used for demodulating user data of EUTRA is selected by selecting a sequence based on information including the physical cell ID of the base station device, group hopping information, and the bandwidth allocated to the mobile station device. When performing MU-MIMO (Multi-User Multiple Input Multiple Output) in which interference between cells (cross-correlation) is kept low and multiple mobile station apparatuses are assigned to the same resource block, uplink reference signals between the mobile station apparatuses Are orthogonally shifted by a higher-order control signal for each mobile station apparatus, so that interference (autocorrelation) between users is ideally set to zero.

  In the uplink, resources are allocated to the mobile station apparatus in units of one subframe, but the frequency resources allocated in units of one slot may change. This change in the allocated frequency resource is called frequency hopping.

  Furthermore, in A-EUTRA, adoption of a scheme in which a single SC-FDMA spectrum is divided and transmitted in the frequency direction is also being studied. In addition to these methods, in AMCS (Adaptive MCS) and A-EUTRA which switch MCS (Modulation Coding Scheme: coding rate and data modulation level of error correction) according to the propagation path situation of each mobile station apparatus In order to increase the channel capacity, the application of space multiplexing (SM) technology using MIMO (Multiple Input Multiple Output) composed of a plurality of transmission / reception antennas is also being studied.

  Here, when the modulation multi-level number and the spatial multiplexing number in spatial multiplexing (MIMO-SM) using MIMO increase, the influence of the channel estimation accuracy on the signal detection accuracy increases. That is, in order to increase the throughput by MIMO-SM, it is necessary to increase the accuracy of signal detection. For this purpose, it is necessary to increase the accuracy of channel estimation.

3GPP TS 36.331, V8.3.0 (2008-09), Technical Specification Group Radio Access Network (Evolved Universal Terrestrial Rel tor e c e r e r c e); http: // www. 3 gpp. org / ftp / Specs / 2008-09 / Rel-8 / 36_series / 36331-830. zip 3GPP TS 36.211, V8.4.0 (2008-09), Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); E-UTRA. http: // www. 3 gpp. org / ftp / Specs / 2008-09 / Rel-8 / 36_series / 36211-840. zip 3GPP TSG RAN WG2 # 59, R2-074444, “Draft3 minutes of the 59 TSG-RAN WG2 meeting”, 3GPP support team 3GPP TSG RAN WG2 # 59, R2-075355, “MCCH design and Sub-frame allocations”, Motorola 3GPP TSG RAN WG1 # 55, R1-084538, “LS on forward compatibility support in Rel-8”, TSG-RAN WG1 3GPP TSG RAN WG1 # 55, R1-084449, “Impact of High Carrier Frequencies on the the Up of LTE-A”, Texas Instruments 3GPP TSG RAN WG1 # 56, R1-091098, “Way Forward on Relaying operation for LTE-A”, CEWiT, Ericsson, Huawei, Motorola, Nokia, NSPN, Pansonic, QRP, Pacific.

  FIG. 13 shows an outline of the EUTRA communication system. In the EUTRA system, when performing MU-MIMO, uplink reference signals from a plurality of mobile station apparatuses A and D in a cell managed by the base station apparatus A are timed so as to be orthogonal to each other as described above. Although the frequency and code are assigned, the uplink reference signal of the mobile station apparatus B and the reference signal from the mobile station apparatus C of the adjacent cell (cell under the jurisdiction of the base station apparatus B) use different sequences. Not orthogonal. Therefore, in EUTRA, by setting different frequency hopping patterns for each mobile station device in units of slots, for example, even when uplink signals from the mobile station device B and the mobile station device C collide with a certain slot, Since another frequency resource is allocated in the slot, it is possible to mitigate interference. By performing frequency hopping in slot units in this way, interference between uplink reference signals from mobile station apparatuses located at the cell edge is reduced.

  By the way, it is assumed that the mobile station apparatus in the vicinity of the cell center performs large-capacity communication using MIMO. When using MIMO, it is necessary to accurately perform propagation path estimation using a reference signal as described above. However, in Non-Patent Document 6, for example, when the carrier frequency is 3.5 GHz, 1 included in the current one slot is used. Only the reference signal for demodulating the symbol is shown to have characteristic degradation even when MIMO is not performed due to the influence of Doppler.

  In this case, by continuously allocating a plurality of slots to the same frequency resource without performing frequency hopping, it is possible to increase the number of reference signals in the time direction and perform propagation path estimation more accurately.

  However, when the above relay station apparatus is arranged at the cell edge for the purpose of coverage extension and it is necessary to transmit user data and control signals using MIMO, the relay station apparatus is also an uplink with the base station apparatus. It is assumed that SU-MIMO (Single-User MIMO) is used. In this case, if frequency hopping is not performed in order to improve MIMO characteristics, interference with an uplink reference signal of a mobile station apparatus or relay station apparatus that does not perform frequency hopping of adjacent cells occurs. If frequency hopping is performed in order to alleviate this, the propagation path estimation performance in the time direction deteriorates, and the MIMO characteristics also deteriorate.

  The present invention has been made in view of such circumstances, and an object thereof is to reduce interference with other cells even when a relay station device using MIMO is arranged at a cell end in a wireless communication system. There is in doing so.

  In order to solve the above-described problem, a first technical means of the present invention is a relay station apparatus connected to one of base station apparatuses that broadcast a common ID (identifier) in a plurality of cells, and the relay station apparatus Reconfigures the uplink reference signal ID holding unit that holds the common ID broadcast from the base station apparatus as an uplink reference signal ID, and the physical cell ID of the base station apparatus to the value of the uplink reference signal ID A physical cell ID replacement unit, and an uplink reference signal generation unit that generates an uplink reference signal using the physical cell ID replaced by the physical cell ID replacement unit.

  According to a second technical means, in the first technical means, the uplink reference signal generation unit includes at least one of a traffic data demodulation reference signal, a control signal demodulation reference signal, and a sounding reference signal transmitted on the uplink. One reference signal is generated using the physical cell ID replaced by the physical cell ID replacement unit, and the remaining reference signals are generated using the physical cell ID before being replaced by the physical cell ID replacement unit. It is characterized by doing.

  A third technical means is a mobile station device connected to one of base station devices that broadcast a common ID (identifier) in a plurality of cells, wherein the mobile station device is broadcast from the base station device. An uplink reference signal ID holding unit that holds a common ID as an uplink reference signal ID, a physical cell ID replacement unit that resets the physical cell ID of the base station apparatus to the value of the uplink reference signal ID, and the physical cell An uplink reference signal generation unit that generates an uplink reference signal using the physical cell ID replaced by the ID replacement unit.

  In a communication system, a fourth technical means includes: a base station apparatus that reports an ID (identifier) common to a plurality of cells; a relay station apparatus in the first technical means; and a mobile station apparatus in the third technical means. It is characterized by comprising.

  According to a fifth technical means, in the first technical means, the base station device connected to the relay station device is an upper relay station device defined as a node higher than the relay station device. Is.

  According to a sixth technical means, in the third technical means, the base station device connected to the mobile station device is a relay station device or a higher-order relay station device defined as a higher-order node than the relay station device. It is characterized by.

  In a communication system, a seventh technical means is a relay station apparatus according to the fifth technical means, and an upper relay that reports a common ID (identifier) in a plurality of cells, defined as a higher node than the relay station apparatus. The mobile station apparatus according to the sixth technical means, which is a mobile station apparatus connected to the higher-order relay station apparatus, is characterized in that it is configured.

  The eighth technical means is a relay station device connected to one of the base station devices that broadcasts SFA ID (Single Frequency Network Area Identify), and the relay station device broadcasts the SFA ID broadcast from the base station device. From the uplink reference signal ID calculation unit that calculates and holds the common uplink reference signal ID in a plurality of cells corresponding to the plurality of base station apparatuses, and the physical cell ID of the base station apparatus, the uplink reference signal ID A physical cell ID replacement unit that resets the value calculated by the calculation unit; and an uplink reference signal generation unit that generates an uplink reference signal using the physical cell ID replaced by the physical cell ID replacement unit. Is.

  According to a ninth technical means, in the eighth technical means, the uplink reference signal generation unit includes at least one of a traffic data demodulation reference signal, a control signal demodulation reference signal, and a sounding reference signal to be transmitted in the uplink. One reference signal is generated using the physical cell ID replaced by the physical cell ID replacement unit, and the remaining reference signals are generated using the physical cell ID before being replaced by the physical cell ID replacement unit. It is characterized by doing.

  A tenth technical means is a base station apparatus connected to the relay station apparatus in the eighth or ninth technical means, and the SFA ID notified by the base station apparatus uniquely corresponds to the uplink reference signal ID This is characterized in that the ID is attached.

  The eleventh technical means comprises a relay station apparatus in the eighth or ninth technical means, a base station apparatus in the tenth technical means, and a mobile station apparatus in the communication system. It is.

  According to a twelfth technical means, in the eighth or ninth technical means, the base station device connected to the relay station device is an upper relay station device defined as a node higher than the relay station device. It is a feature.

  A thirteenth technical means is an upper relay station apparatus connected to the relay station apparatus in the twelfth technical means, and the SFA ID notified by the upper relay station apparatus is uniquely associated with the uplink reference signal ID. ID.

  The fourteenth technical means is characterized in that, in the communication system, the relay station apparatus according to the twelfth technical means, the higher relay station apparatus according to the thirteenth technical means, and the mobile station apparatus are configured. .

  According to the communication system according to the present invention, it is possible to reduce interference with other cells even when a relay station device using MIMO is arranged at the cell edge.

It is a schematic block diagram which shows an example of the base station apparatus in the communication system which concerns on the 1st Embodiment of this invention. It is a schematic block diagram which shows an example of the relay station apparatus in the communication system which concerns on the 1st Embodiment of this invention. It is a schematic block diagram which shows an example of the mobile station apparatus in the communication system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows an example of the reference signal production | generation part of the relay station apparatus in the communication system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows an example of the reference signal production | generation part of the mobile station apparatus in the communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the cell structure in the communication system of this invention. It is a block diagram which shows an example of the reference signal production | generation part of the relay station apparatus in the communication system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows an example of the reference signal production | generation part of the mobile station apparatus in the communication system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows an example of the reference signal production | generation part of the relay station apparatus in the communication system which concerns on the 3rd Embodiment of this invention. It is a figure which shows an example of the downlink frame structure of EUTRA. It is a figure which shows the conventional sub-frame position designation | designated for every SFA ID. It is a figure which shows an example of the upstream frame structure of EUTRA. It is a figure which shows an example of the cell structure of the communication system of EUTRA and A-EUTRA.

[First Embodiment]
The communication system according to the first embodiment of the present invention is a wireless communication system using a multi-carrier communication system, and the setting of the uplink reference signal code, which has been conventionally performed by a cell-specific physical cell ID, is performed as described above. This is performed by using an uplink reference signal ID notified by SIB or the like or notified as an individual control signal instead of the physical cell ID.

  The first embodiment of the present invention will be described below with reference to FIGS. 1, FIG. 2, and FIG. 3 are schematic block diagrams illustrating examples of a base station device, a relay station device, and a mobile station device, respectively, in the communication system according to the first embodiment of the present invention. 4 is a block diagram illustrating an example of a reference signal generation unit in the relay station apparatus of FIG. 2, FIG. 5 is a block diagram illustrating an example of a reference signal generation unit in the mobile station apparatus of FIG. 3, and FIG. It is a figure which shows an example of the cell structure in the communication system of this invention.

  First, a base station apparatus in a communication system according to the first embodiment will be described with reference to FIG. The base station apparatus 100 illustrated in FIG. 1 includes a receiving unit 101, a demodulating unit 102, a decoding unit 103, an upper layer 104, a control unit 105, a coding unit 106, a reference signal generation unit 107, a modulation unit 108, a multiplexing unit 109, a transmission Part 110, receiving antenna AN11, and transmitting antenna AN12. In FIG. 1, the other components of the base station apparatus 100 are omitted because they are not related to the present embodiment.

  Upper layer 104 inputs downlink relay station control data for relay station control, and downlink traffic data and downlink control signals for mobile station apparatuses, to coding section 106. For mobile station devices, communication via relay station devices is also included. Further, an uplink reference signal ID for determining a code sequence of the uplink reference signal is also included. The encoding unit 106 encodes the input data and inputs the encoded data to the modulation unit 108. Modulation section 108 modulates the encoded signal. The reference signal generation unit 107 generates a downlink reference signal. Further, the signal output from modulation section 108 and the downlink reference signal generated by reference signal generation section 107 are mapped to the frequency domain by multiplexing section 109. An output signal from the multiplexing unit 109 is input to the transmission unit 110. The transmission unit 110 converts a frequency domain signal into a time domain signal and performs power amplification on a carrier wave having a predetermined frequency. The signal output from the transmission unit 110 is transmitted from the transmission antenna AN12.

  A signal received by the receiving antenna AN11 is input to the receiving unit 101. The receiving unit 101 converts a signal received from a mobile station device or a relay station device into a baseband digital signal, and the converted signal is input to the demodulation unit 102 and demodulated. The demodulation unit 102 performs propagation path compensation based on the reference signal included in the signal converted by the reception unit 101, and follows parameters (such as presence / absence of MIMO, modulation scheme, frequency hopping pattern) input from the control unit 105. The signal other than the reference signal is demodulated. The demodulated signal is then input to the decoding unit 103 and decoded, and the correctly decoded uplink relay station control data, uplink control signal, uplink traffic data, and uplink reference signal ID are output to the upper layer 104.

  Control information necessary for controlling these blocks is input from the upper layer 104 to the control unit 105. Control information related to transmission is appropriately input as transmission control information by the control unit 105 to each block of the encoding unit 106, the reference signal generation unit 107, the modulation unit 108, the multiplexing unit 109, and the transmission unit 110. Control information related to reception is appropriately input to each block of the reception unit 101, the demodulation unit 102, and the decoding unit 103 as reception control information by the control unit 105.

  Next, with reference to FIG. 2 and FIG. 4, the relay station apparatus in the communication system which concerns on 1st Embodiment is demonstrated. 2 includes a receiving unit 201, a demodulating unit 202, a decoding unit 203, a higher layer 204, a control unit 205, a coding unit 206, a reference signal generation unit 207, a modulation unit 208, a multiplexing unit 209, a transmission , Unit 210, control information selection unit 211, reception antenna AN21, and transmission antenna AN22. In FIG. 2, other components of the relay station device 200 are omitted because they are not related to the present embodiment.

  Upper layer 204 inputs uplink relay station control data to be transmitted to the base station apparatus, uplink / downlink traffic data between the base station apparatus and the mobile station apparatus, and uplink / downlink control signals to encoding section 206. If the uplink / downlink traffic data and the uplink / downlink control signal are for a base station apparatus, the data received from the mobile station apparatus by the reception unit 201 is transmitted via the upper layer 204. On the other hand, for a mobile station device, the data received from the base station device by the receiving unit 201 is transmitted via the upper layer 204. The encoding unit 206 encodes the input data and inputs it to the modulation unit 208. Modulation section 208 modulates the encoded signal.

  Also, the reference signal generation unit 207 generates a reference signal used for demodulating uplink traffic data, a reference signal used for demodulating an uplink control signal, and a sounding reference signal for measuring propagation quality. Here, the reference signal used for demodulation of the uplink traffic data is generated based on the uplink reference signal ID and the time cyclic shift. The signal output from modulation section 208 and each reference signal generated by reference signal generation section 207 are multiplexed by multiplexing section 209. For the reference signal, a downlink reference signal is multiplexed for a mobile station device, and an uplink reference signal is multiplexed for a base station device.

  An output signal from the multiplexing unit 209 is input to the transmission unit 210. The transmission unit 210 performs power amplification by placing the input signal on a carrier having a predetermined frequency. Here, when it is for the base station apparatus and frequency hopping is instructed from the base station, the frequency is changed based on the frequency hopping pattern input from the control unit 205. The signal output from the transmission unit 210 is transmitted from the transmission antenna AN22. Note that the transmission frequency change based on the frequency hopping pattern may be performed by the transmission unit 210, and when a wideband signal is generated by the multiplexing unit 209, the frequency mapping in the multiplexing unit 209 may be changed.

  A signal received by the receiving antenna AN21 is input to the receiving unit 201. The receiving unit 201 converts a signal received from the mobile station device or the base station device into a baseband digital signal, and the converted signal is input to the demodulating unit 202 and demodulated. The signal demodulated by the demodulator 202 is then input to the decoder 203 and decoded, and the control signal and traffic data decoded correctly are output to the upper layer 204. Further, downlink relay station control data transmitted from the base station apparatus is also output to the upper layer 204. Control information necessary for the control of each block is selected by the control information selection unit 211 prior to transmission / reception with each station and input to the control unit 205. When transmitting / receiving relay station control data, relay station control information is input to the control unit 205. When transmitting / receiving control signals and traffic data to / from the base station apparatus, base station apparatus control information is input to the control unit 205. In addition, when transmitting / receiving control signals and traffic data to / from the mobile station apparatus, mobile station apparatus control information is input to the control unit 205.

  Regarding the control information described above, control information related to transmission is appropriately transmitted to the blocks of the encoding unit 206, the reference signal generation unit 207, the modulation unit 208, the multiplexing unit 209, and the transmission unit 210 as transmission control information by the control unit 205. Is input. Control information related to reception is appropriately input to the blocks of the reception unit 201, the demodulation unit 202, and the decoding unit 203 as reception control information by the control unit 205.

  The reference signal generation unit 207 of the relay station apparatus 200 includes a traffic data demodulation reference signal generation unit 401, a control signal demodulation reference signal generation unit 402, and a sounding reference, as illustrated as the reference signal generation unit 400 in FIG. The signal generation unit 403, the uplink reference signal ID holding unit 404, the physical cell ID replacement unit 405, and the downlink reference signal generation unit 406 are configured.

  Of the transmission control information input from the control unit 205, the uplink reference signal ID is notified by SIB or the like, or is notified as an individual control signal, is held by the uplink reference signal ID holding unit 404, and is The reference signal ID holding unit 404 outputs the physical cell ID replacement unit 405. The physical cell ID replacement unit 405 replaces the value of the physical cell ID in the input transmission control signal with the value of the uplink reference signal ID. The transmission control information including the replaced (reset) physical cell ID includes a traffic data demodulation reference signal generation unit 401, a control signal demodulation reference signal generation unit 402, and a sounding reference signal generation unit 403. Sent to the uplink reference signal generator 407. Further, the transmission control signal input from the control unit 205 is also input to the downlink reference signal generation unit 406. Uplink reference signal generation section 407 and downlink reference signal generation section 406 generate a reference signal based on the input control information.

  In this way, the relay station apparatus 200 uses the uplink reference signal ID notified by SIB or the like or notified as an individual control signal instead of the physical cell ID for setting the code of the uplink reference signal. And each uplink reference signal is generated.

  Next, with reference to FIG. 3 and FIG. 5, the mobile station apparatus in the communication system which concerns on 1st Embodiment is demonstrated. The mobile station apparatus 300 illustrated in FIG. 3 includes a reception unit 301, a demodulation unit 302, a decoding unit 303, an upper layer 304, a control unit 305, a coding unit 306, a reference signal generation unit 307, a modulation unit 308, a multiplexing unit 309, and a transmission The unit 310, the receiving antenna AN31, and the transmitting antenna AN32. In FIG. 3, the other components of the mobile station apparatus 300 are omitted because they are not related to the present embodiment. The mobile station device 300 is configured as a mobile phone, a mobile information terminal, or the like.

  Upper layer 304 inputs uplink traffic data and an uplink control signal to encoding section 306. The encoding unit 306 encodes the input data and inputs it to the modulation unit 308. Modulation section 308 modulates the encoded signal.

  In addition, the reference signal generation unit 307 generates a reference signal used for demodulation of uplink traffic data, a reference signal used for demodulation of the uplink control signal, and a sounding reference signal for measuring propagation quality. Here, the reference signal used for demodulation of the uplink traffic data is generated based on the uplink reference signal ID and the time cyclic shift information. The signal output from the modulation unit 308 and the uplink reference signal generated by the reference signal generation unit 307 are multiplexed by the multiplexing unit 309.

  An output signal from the multiplexing unit 309 is input to the transmission unit 310. The transmitting unit 310 performs power amplification by placing the input signal on a carrier wave having a predetermined frequency. Here, when it is for the base station apparatus and frequency hopping is instructed from the base station, the frequency is changed based on the frequency hopping pattern input from the control unit 305. The signal output from the transmission unit 310 is transmitted from the transmission antenna AN32. Note that the transmission frequency change based on the frequency hopping pattern may be performed by the transmission unit 310, or when the multiplexing unit 309 generates a wideband signal, the multiplexing unit 309 may change the frequency mapping.

  A signal received by the receiving antenna AN31 is input to the receiving unit 301. The reception unit 301 converts the received signal into a baseband digital signal, and the converted signal is input to the demodulation unit 302 and demodulated. Demodulating section 302 performs propagation path compensation based on the reference signal included in the signal converted by receiving section 301, and other than the reference signal according to parameters (such as presence / absence of MIMO, modulation scheme, etc.) input from control section 305. Is demodulated. The demodulated signal is then input to the decoding unit 303 and decoded, and the correctly decoded downlink control signal, downlink traffic data, and uplink reference signal ID are output to the upper layer 304.

  Control information necessary for controlling these blocks is input from the upper layer 304 to the control unit 305. Control information related to transmission is appropriately input by the control unit 305 as transmission control information to each block of the encoding unit 306, the reference signal generation unit 307, the modulation unit 308, the multiplexing unit 309, and the transmission unit 310. Control information related to reception is appropriately input as reception control information by the control unit 305 to each block of the reception unit 301, the demodulation unit 302, and the decoding unit 303.

  The reference signal generation unit 307 of the mobile station device 300, as illustrated as the reference signal generation unit 500 in FIG. 5, includes a traffic data demodulation reference signal generation unit 501, a control signal demodulation reference signal generation unit 502, and a sounding reference. The signal generation unit 503, the uplink reference signal ID holding unit 504, and the physical cell ID replacement unit 505 are configured.

  Among the transmission control information input from the control unit 305, the uplink reference signal ID is notified by SIB or the like, or is notified as an individual control signal, and is held by the uplink reference signal ID holding unit 504. The reference signal ID holding unit 504 outputs the physical cell ID replacement unit 505. The physical cell ID replacement unit 505 replaces the physical cell ID value in the input transmission control signal with the uplink reference signal ID value. The transmission control information including the replaced (reconfigured) physical cell ID includes a traffic data demodulation reference signal generation unit 501, a control signal demodulation reference signal generation unit 502, and a sounding reference signal generation unit 503. Is sent to the uplink reference signal generation section 506. Each reference signal generator generates a reference signal based on the input control information.

  In this way, the mobile station apparatus 300 uses the uplink reference signal ID that is notified of the setting of the code of the uplink reference signal by SIB or the like or notified as an individual control signal instead of the physical cell ID. And each uplink reference signal is generated.

  An example of a cell configuration in the communication system including the base station device 100, the relay station device 200, and the mobile station device 300 described above will be described with reference to FIG. In this example, the cell A of the physical cell ID = 1 managed by the base station apparatus Na, the cell B of the physical cell ID = 2 managed by the base station apparatus Nb, and the cell C of the physical cell ID = 3 managed by the base station apparatus Nc The relay station device Ra is arranged in the cell A, and the relay station device Rb is arranged in the cell B.

  In such a cell configuration, when the uplink reference signal of the relay station apparatus Rb arrives to the base station apparatus Na, conversely, when the uplink reference signal of the relay station apparatus Ra arrives to the base station apparatus Nb Then, scheduling is performed such that at least the uplink reference signal ID values of the cell A and the cell B are the same (common), and the time cyclic shifts in the same resource block are different values. The setting of the uplink reference signal ID can be realized by performing installation / operation start of the base station device or the relay station device. The value of the time cyclic shift can be realized by setting the range of the value of the cell A from 0 to 3, the range of the cell B from 4 to 6, for example. The uplink reference signal ID and the time cyclic shift value are not limited to the above method, and may be set through an X2 interface between base stations corresponding to dynamic or semi-static, An MME (Mobility Management Entity) that controls a plurality of base stations in a bundle may perform setting through the S1 interface and notify each base station.

  With the above setting, even if the relay station devices Ra and Rb at the cell edge and the mobile station devices Ua and Ub connected to these relay station devices do not perform frequency hopping, the uplink reference signal sequence is the same and the time cyclic shift is performed. Since they are different from each other, they are orthogonal to each other and interference can be suppressed. As described above, it is beneficial not to perform frequency hopping particularly when MIMO is used. Further, since the mobile station apparatus Uc at the cell edge of the cell C has no relay station apparatus in the cell C, the propagation quality is poor and MIMO cannot be used. Therefore, by performing frequency hopping, interference from the relay station devices Ra and Rb and the mobile station devices Ua and Ub can be reduced as a result, and the relay station devices Ra and Rb and the mobile station devices Ua and Ub can also be reduced. Interference from the mobile station apparatus Uc can be mitigated.

[Second Embodiment]
In the first embodiment, all mobile station devices and relay station devices in a plurality of cells generate uplink reference signal codes using the uplink reference signal ID instead of the physical cell ID. In the present invention, the uplink reference signal ID can be applied only to the relay station apparatus, and such a technique will be described as a second embodiment with reference to FIGS. 7 and 8. 7 and 8 are block diagrams illustrating examples of the reference signal generation unit of the relay station device and the reference signal generation unit of the mobile station device, respectively, in the communication system according to the second embodiment of the present invention.

  The base station device, the relay station device, and the mobile station device of this embodiment have the same configurations as those of FIGS. 1, 2, and 3 of the first embodiment, respectively. However, in the relay station device 200 of FIG. 2, the reference signal generation unit 700 illustrated in FIG. 7 is adopted instead of the reference signal generation unit 207 (that is, the reference signal generation unit 400 of FIG. 4), and the mobile station device of FIG. 300, a reference signal generation unit 800 illustrated in FIG. 8 is employed instead of the reference signal generation unit 307 (that is, the reference signal generation unit 500 in FIG. 5).

  In this embodiment, the reference signal generation unit 700 included in the relay station apparatus 200 includes a traffic data demodulation reference signal generation unit 701, a control signal demodulation reference signal generation unit 702, a sounding reference signal generation unit 703, an uplink It comprises a reference signal ID holding unit 704, a physical cell ID replacement unit 705, and a downlink reference signal generation unit 706.

  Of the transmission control information input from the control unit 205, the uplink reference signal ID is notified by SIB or the like, or is notified as an individual control signal, is held by the uplink reference signal ID holding unit 704, and is The reference signal ID holding unit 704 outputs the physical cell ID replacement unit 705. The physical cell ID replacement unit 705 replaces the value of the physical cell ID in the input transmission control signal with the value of the uplink reference signal ID. The transmission control information including the replaced (reconfigured) physical cell ID is output to the traffic data demodulation reference signal generation unit 701. Further, transmission control signals other than the uplink reference signal ID input from the control unit 205 are also input to the control signal demodulation reference signal generation unit 702, the sounding reference signal generation unit 703, and the downlink reference signal generation unit 706. . Each reference signal generator generates a reference signal based on the input control information.

  In this way, the relay station apparatus 200 uses the uplink reference signal ID notified by SIB or the like or notified as an individual control signal instead of the physical cell ID for setting the code of the uplink reference signal. And each uplink reference signal is generated.

  In this embodiment, the reference signal generation unit 800 included in the mobile station apparatus 300 includes a traffic data demodulation reference signal generation unit 501, a control signal demodulation reference signal generation unit 502, and a sounding reference signal generation unit 503. Then, a reference signal used for demodulating uplink traffic data, a reference signal used for demodulating the uplink control signal, and a sounding reference signal for measuring propagation quality are generated. However, the reference signal used for demodulating uplink traffic data is generated based on the physical cell ID as in the prior art, not the uplink reference signal ID. That is, the reference signal generation unit 800 according to the present embodiment has the same configuration as that of the prior art in which the uplink reference signal ID holding unit 504 and the physical cell ID replacement unit 505 are omitted from the reference signal generation unit 500 of FIG.

  Also in the communication system including the base station device 100, the relay station device 200, and the mobile station device 300 according to the present embodiment, the cell configuration can be illustrated in FIG. In this cell configuration, when the uplink reference signal of the relay station apparatus Rb arrives at the base station apparatus Na, and conversely, when the uplink reference signal of the relay station apparatus Ra arrives at the base station apparatus Nb, Similar to the first embodiment, scheduling is performed such that at least the uplink reference signal ID values of the cell A and the cell B are the same (common), and the cyclic shifts in the same resource block are different values. Furthermore, uplink resource allocation for traffic data transmission to the relay station apparatus in the base station apparatuses Na and Nb is performed in a coordinated manner so as to be in the same subframe. Information on which subframe is allocated may be exchanged using the above-described X2 interface, or may be controlled by the MME using the S1 interface.

  With the above settings, even when the cell-side relay station apparatuses Ra and Rb do not perform frequency hopping, the uplink reference signal sequences are the same and the time cyclic shifts are different, so that they are orthogonal to each other and interference can be suppressed. . Also, the relay station device Ra and the mobile station device Ud that does not perform frequency hopping are not orthogonal because of their different sequences, but the relay station device and the mobile station device are assigned at different times (subframes), so there is a problem. Does not occur. Further, since the mobile station apparatus Uc at the cell edge of the cell C does not have a relay station apparatus in the cell C, the propagation quality is poor and MIMO cannot be used. Therefore, by performing frequency hopping, interference from the relay station devices Ra and Rb and the mobile station devices Ua and Ub can be reduced as a result, and the relay station devices Ra and Rb and the mobile station devices Ua and Ub can also be reduced. Interference from the mobile station apparatus Uc can be mitigated. Further, since the control signal demodulation reference signal and the sounding reference signal are derived using the physical cell ID of each cell, resource allocation can be performed as usual regardless of the scheduling of traffic data. In other words, control signal transmission for HARQ (Hybrid Automatic Repeat reQuest) processing and sounding reference signal transmission for propagation quality measurement can be performed without being restricted by the scheduling of traffic data in this embodiment.

Here, the physical cell ID is used for the reference signal generation in the control signal demodulation reference signal generation unit 702, but the uplink reference signal ID may be used similarly to the traffic data. That is, a mobile station apparatus that transmits a reference signal generated using a physical cell ID as a control signal demodulation reference signal, and a relay station that transmits a reference signal generated using an uplink reference signal ID as a control signal demodulation reference signal By allocating devices to different resources, it is possible to generate reference signals using uplink reference signal IDs not only for traffic data demodulation reference signals but also for control signal demodulation reference signals.
Similarly, by separating the resources of the sounding reference signal, the sounding reference signal can also be generated using the uplink reference signal ID. Such an application can also be applied to the following third embodiment.

[Third Embodiment]
In the second embodiment, the method of applying the uplink reference signal ID only to the relay station device has been described. In the present invention, MBSFN parameters can also be used for setting the uplink reference signal ID, and such a method will be described as a third embodiment.

  As described above, in MBSFN, a plurality of cells transmit MBMS using the same carrier wave. Subframes for transmitting MBMS can be acquired by broadcast information, P-MCCH, and S-MCCH. Further, when there are a plurality of MBMS service areas, a subframe used for each MBMS can be designated using the SFA ID.

  In the present embodiment, a relay station apparatus uses a plurality of cells in which interference is generated by the relay station apparatus as one area, and subframe information used for the area and one SFA ID using the MBSFN mechanism. To notify.

  In the relay station apparatus, communication with the base station apparatus is performed using the allocated MBSFN subframe, and a value uniquely calculated from the SFA ID (a value common to a plurality of cells) is used as an uplink reference signal in the second embodiment. Use as ID.

  The configuration of the communication system of the present embodiment capable of using such SFA ID will be described with reference to FIG. FIG. 9 is a block diagram illustrating an example of a reference signal generation unit of the relay station apparatus in the communication system according to the third embodiment of the present invention.

  The base station device, relay station device, and mobile station device of this embodiment have the same configurations as those of FIGS. 1, 2, and 3 of the second embodiment, respectively. However, in the relay station device 200 of FIG. 2, a reference signal generation unit 900 illustrated in FIG. 9 is employed instead of the reference signal generation unit 207 (that is, the reference signal generation unit 700).

  In this embodiment, the reference signal generation unit 900 included in the relay station apparatus 200 includes a traffic data demodulation reference signal generation unit 901, a control signal demodulation reference signal generation unit 902, a sounding reference signal generation unit 903, an uplink A reference signal ID calculation unit 904, a physical cell ID replacement unit 905, and a downlink reference signal generation unit 906 are configured.

  Of the transmission control information input from the control unit 205, the SFA ID is uniquely converted into an uplink reference signal ID (uplink reference signal ID common to a plurality of cells) by the uplink reference signal ID calculation unit 904, and is retained. The uplink reference signal ID calculation unit 904 outputs the physical cell ID replacement unit 905. The physical cell ID replacement unit 905 replaces the value of the physical cell ID in the input transmission control signal with the value of the uplink reference signal ID. The transmission control information including the replaced (reset) physical cell ID is output to the traffic data demodulation reference signal generation unit 901. Further, the transmission control signal other than the SFA ID input from the control unit 205 is also input to the control signal demodulation reference signal generation unit 902, the sounding reference signal generation unit 903, and the downlink reference signal generation unit 906. Each reference signal generator generates a reference signal based on the input control information.

  In this way, the relay station apparatus 200 performs the setting of the uplink reference signal code by using the uplink reference signal ID calculated from the notified SFA ID instead of the physical cell ID, and generates each uplink reference signal. To do.

  Also in the communication system including the base station device 100, the relay station device 200, and the mobile station device 300 according to the present embodiment, the cell configuration can be illustrated in FIG. In this cell configuration, when the uplink reference signal of the relay station apparatus Rb arrives to the base station apparatus Na, conversely, when the uplink reference signal of the relay station apparatus Ra arrives to the base station apparatus Nb, at least The values of the uplink reference signal IDs of the cell A and the cell B are made the same (common) and notified to the relay station apparatus as the SFA ID, and scheduling is performed so that the time cyclic shifts in the same resource block have different values. Further, the uplink resource allocation for traffic data transmission to the relay station apparatus in the base station apparatuses Na and Nb is coordinated so as to be the same subframe, and scheduling is performed as MBSFN subframe allocation. Information on which subframe is allocated may be exchanged using the above-described X2 interface, may be controlled by the MME using the S1 interface, or allocated as an MBSFN subframe in the downlink It is also possible to assign an uplink subframe that uniquely corresponds to a resource (for example, an uplink subframe four subframes after a subframe allocated in the downlink).

  With the above setting, as in the second embodiment, even when the cell-side relay station devices Ra and Rb do not perform frequency hopping, the uplink reference signal sequences are the same and the time cyclic shifts are different, so that they are orthogonal to each other. Interference can be suppressed. Also, the relay station device Ra and the mobile station device Ud that does not perform frequency hopping are not orthogonal because of their different sequences, but the relay station device and the mobile station device are assigned at different times (subframes), so there is a problem. Does not occur. Furthermore, since the mobile station apparatus Uc at the cell edge of the cell C has no relay station apparatus in the cell C, the propagation quality is poor and MIMO cannot be used. Therefore, by performing frequency hopping, interference from the relay station devices Ra and Rb and the mobile station devices Ua and Ub can be reduced as a result, and the relay station devices Ra and Rb and the mobile station devices Ua and Ub can also be reduced. Interference from the mobile station apparatus Uc can be mitigated. Further, since the control signal demodulation reference signal and the sounding reference signal are derived using the physical cell ID of each cell, resource allocation can be performed as usual regardless of the scheduling of traffic data. That is, control signal transmission for HARQ processing and sounding reference signal transmission for propagation quality measurement can be performed without being restricted by the scheduling of traffic data in this embodiment.

  Further, in the present embodiment, it is possible to reduce additional signaling by notifying the uplink reference signal ID using the MBSFN signaling mechanism.

  It is also conceivable to classify SFA IDs used for uplink reference signal ID calculation into a plurality of groups and to have a different subframe structure for each group. For example, SFA IDs used for uplink reference signal ID calculation are classified into two groups, one for a fixedly installed relay station device and one for a moving relay station device. Then, the relay station apparatus to which the SFA ID for the fixedly installed relay station apparatus is assigned transmits the uplink signal with a predetermined subframe structure (for example, the uplink reference signal for demodulation is the same as the conventional subframe structure), A relay station apparatus to which an SFA ID for a moving relay station apparatus is assigned may transmit an uplink signal in a subframe structure different from the default (for example, a subframe structure including many uplink reference signals for demodulation). Conceivable. As a result, even in a moving relay station device, it is possible to suppress degradation of the propagation path estimation performance of the relay link. Or, on the contrary, in a fixedly installed relay station device, since the propagation path fluctuation of the relay link is small, it is also possible to transmit an uplink signal with a subframe structure in which the uplink reference signal for demodulation is less than the prescribed subframe structure. Conceivable. As a result, it is possible to increase the amount of uplink information communication by using the resources used for the reference signal in the relay station apparatus of fixed installation for the traffic data and the control signal.

[Supplementary explanation for each embodiment]
In the first to third embodiments described above, the base station device and the relay station devices and mobile station devices under the base station device have been described. However, the present invention is not limited to this. The present invention can be similarly applied to a relay station apparatus), a subordinate relay station apparatus (lower relay station apparatus), and a mobile station apparatus. That is, an upper relay station device defined as a node higher than a relay station device (lower relay station) is regarded as a base station device, and a plurality of higher relay station devices share a common ID. In the first embodiment, a lower relay is used. Informing the station device and the mobile station device, and in the second embodiment, informing the lower relay station device. Similarly, in the third embodiment, the upper relay station apparatus is regarded as a base station apparatus, and a common SFA ID is reported to the lower relay station apparatus. For example, a relay station device defined as a type 1 relay node shown in Non-Patent Document 7 is recognized as one of base station devices from other mobile station devices and relay station devices. That is, since the relay station device operates as a base station device, the base station device in the above embodiment can be read as the relay station device by making the processing in the access link of the relay station device equivalent to the processing of the base station device. Is possible. The present invention can also be applied to a system configuration in which no lower relay station device exists. That is, the relay station apparatus can be regarded as a base station apparatus, and a plurality of relay station apparatuses can be configured to notify a common ID or SFA ID to the mobile station apparatus.

  In the second and third embodiments, the same resource is allocated to the relay station apparatus between adjacent cells to avoid interference with a mobile station apparatus that does not perform frequency hopping. For example, in FIG. 6, in the subframe allocated to the relay station apparatus in cell B, the interference is mitigated by scheduling so that the same subframe is allocated to the mobile station apparatus Ud near the center in cell A. It is also possible. That is, even when the same resource cannot be allocated between adjacent cells, interference can be similarly avoided by allocating a mobile station device near the center of the own cell to a resource allocated to a relay station device by another cell. It becomes possible to do. Alternatively, interference can be mitigated by allocating a mobile station device that performs frequency hopping instead of a mobile station device near the center of the own cell.

  Further, in the second and third embodiments, the uplink reference signal ID is used for code generation of a reference signal used for demodulating traffic data. However, for the sounding reference signal, the mobile station device and the relay station device in the cell When transmitting with the same resource, it is necessary to use a physical cell ID. However, it is also possible to use the uplink reference signal ID when transmitting with a different resource like the traffic data.

  In the first to third embodiments, the case has been described in which the relay station apparatus arranged at the cell edge performs communication by MIMO (no frequency hopping). However, switching between communication involving frequency hopping of the relay station apparatus or mobile station apparatus and communication not involving it is normally specified by a transmission method notified from the connected base station apparatus or relay station apparatus. The transmission method notified here indicates the number of resources included in the PDCCH, the modulation method, and the control information notified by signaling of the upper layer (RRC, MAC [Media Access Control]). The transmission method is determined based on a propagation path condition such as a propagation loss between connected devices and a measured value such as interference wave reception power. That is, for the relay station apparatus arranged near the cell center, a transmission method is designated so that transmission is performed using an uplink reference signal for demodulation using a physical cell ID as in the conventional case, and the relay station apparatus is arranged near the cell edge. For the relay station apparatus, it is conceivable to specify a transmission scheme so that transmission is performed using an uplink reference signal for demodulation using the uplink reference signal ID. Similarly, for a mobile station apparatus, it may be possible to specify a transmission scheme so that transmission is performed with an uplink reference signal for demodulation using an uplink reference signal ID for the mobile station apparatus existing near the cell edge. .

100, Na, Nb, Nc ... base station device, 200, Ra, Rb ... relay station device, 300, Ua, Ub, Uc, Ud ... mobile station device, 101, 201, 301 ... receiving unit, 102, 202, 302 ... demodulator, 103, 203, 303 ... decoder, 104, 204, 304 ... upper layer, 105, 205, 305 ... controller, 106, 206, 306 ... encoder, 107, 207, 307, 400, 500, 700, 800, 900 ... reference signal generation unit, 108, 208, 308 ... modulation unit, 109, 209, 309 ... multiplexing unit, 110, 210, 310 ... transmission unit, 211 ... control information selection unit, 401, 501, 701 , 901... Traffic data demodulation reference signal generator, 402, 502, 702, 902... Control signal demodulation reference signal generator, 403, 503, 70 , 903 ... Sounding reference signal generator, 404, 504, 704 ... Reference signal ID holding unit, 405, 505, 705, 905 ... Physical cell ID replacement unit, 406, 706, 906 ... Downlink reference signal generator, 407, 506 ... an uplink reference signal generation unit, 904 ... a reference signal ID calculation unit, AN11, AN21, AN31 ... a reception antenna, AN12, AN22, AN32 ... a transmission antenna.

Claims (14)

A relay station device connected to one of base station devices that broadcast a common ID (identifier) in a plurality of cells, the relay station device comprising:
An uplink reference signal ID holding unit that holds the common ID broadcast from the base station apparatus as an uplink reference signal ID;
A physical cell ID replacement unit that resets the physical cell ID of the base station apparatus to the value of the uplink reference signal ID;
An uplink reference signal generation unit that generates an uplink reference signal using the physical cell ID replaced by the physical cell ID replacement unit;
A relay station apparatus comprising: The relay station apparatus according to claim 1,
The uplink reference signal generator is
By using the physical cell ID in which at least one reference signal among the traffic data demodulation reference signal, the control signal demodulation reference signal, and the sounding reference signal transmitted in the uplink is replaced by the physical cell ID replacement unit. Generate
A relay station apparatus characterized in that the remaining reference signal is generated using a physical cell ID before being replaced by the physical cell ID replacement unit. A mobile station apparatus connected to one of base station apparatuses that broadcast a common ID (identifier) in a plurality of cells, the mobile station apparatus comprising:
An uplink reference signal ID holding unit that holds the common ID broadcast from the base station apparatus as an uplink reference signal ID;
A physical cell ID replacement unit that resets the physical cell ID of the base station apparatus to the value of the uplink reference signal ID;
An uplink reference signal generation unit that generates an uplink reference signal using the physical cell ID replaced by the physical cell ID replacement unit;
A mobile station apparatus comprising:   A communication system including a base station device that broadcasts a common ID (identifier) in a plurality of cells, the relay station device according to claim 1, and the mobile station device according to claim 3.   The relay station apparatus according to claim 1, wherein the base station apparatus connected to the relay station apparatus is an upper relay station apparatus defined as a higher node than the relay station apparatus. .   The mobile station apparatus according to claim 3, wherein the base station apparatus connected to the mobile station apparatus is a relay station apparatus or a higher-order relay station apparatus defined as a higher-order node than the relay station apparatus. A mobile station device to perform.   The relay station apparatus according to claim 5, the upper relay station apparatus that is defined as a node higher than the relay station apparatus and that reports a common ID (identifier) in a plurality of cells, and the movement according to claim 6. A communication system comprising a station device and a mobile station device connected to the upper relay station device. A relay station device connected to one of base station devices that broadcast SFA ID (Single Frequency Network Area Identify), wherein the relay station device includes:
An uplink reference signal ID calculating unit that calculates and holds an uplink reference signal ID common to a plurality of cells corresponding to the plurality of base station devices from the SFA ID broadcast from the base station device;
A physical cell ID replacement unit for resetting the physical cell ID of the base station apparatus to a value calculated by the uplink reference signal ID calculation unit;
An uplink reference signal generation unit that generates an uplink reference signal using the physical cell ID replaced by the physical cell ID replacement unit;
A relay station apparatus comprising: The relay station apparatus according to claim 8,
The uplink reference signal generator is
By using the physical cell ID in which at least one reference signal among the traffic data demodulation reference signal, the control signal demodulation reference signal, and the sounding reference signal transmitted in the uplink is replaced by the physical cell ID replacement unit. Generate
A relay station apparatus characterized in that the remaining reference signal is generated using a physical cell ID before being replaced by the physical cell ID replacement unit.   The base station apparatus connected to the relay station apparatus according to claim 8 or 9, wherein the SFA ID notified by the base station apparatus is an ID uniquely associated with the uplink reference signal ID. Base station apparatus.   A communication system comprising the relay station device according to claim 8, the base station device according to claim 10, and a mobile station device.   The relay station device according to claim 8 or 9, wherein the base station device connected to the relay station device is a higher-order relay station device defined as a higher-order node than the relay station device. Station equipment.   The upper relay station apparatus connected to the relay station apparatus according to claim 12, wherein the SFA ID notified by the upper relay station apparatus is an ID uniquely associated with the uplink reference signal ID. An upper relay station apparatus.   A communication system comprising the relay station device according to claim 12, the higher-order relay station device according to claim 13, and a mobile station device.

Images