JP2007227996A - Mobile station device, base station equipment, random access method of mobile station device, mapping method of service frequency band, scheduling method, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize wireless resource efficiently by determining a service frequency band adapted to a mobile station of different mobile station class in the uplink, and reducing collision occurring at the time of random access to a contention base channel. <P>SOLUTION: A random access service frequency band used by a mobile station for random access to a base station is calculated based on information for making the mobile station identifiable, a natural frequency bandwidth of the mobile station, and a natural frequency bandwidth of the base station. For example, subscriber identification information is employed as the information for making the mobile station identifiable. On the drawing, the number 0010 indicates that a random access service frequency band No. 0010 is used at a service frequency band position No. 00 when a mobile station of 5 MHz mobile station class performs random access transmission to a contention base channel. Since the mobile stations can be distributed to the transmission frequency region of uplink, probability of collision can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile station apparatus, a base station apparatus, a random access method for a mobile station apparatus, a used frequency band mapping method, a scheduling method, a program, and a recording medium, and more specifically, different frequency bandwidths (for example, 1.25 MHz). Of a different frequency bandwidth (for example, 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz) from a mobile station (mobile station class) having a transmission / reception capability of 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz) In a communication system with a base station (base station class) having transmission and reception capabilities, a frequency band mapping method used by the mobile station apparatus in the uplink from the mobile station apparatus to the base station apparatus, random access performed at the start of communication, etc. The present invention relates to a method and a scheduling method.

  In 3GPP (3rd Generation Partnership Project), a W-CDMA (Wideband Code Division Multiple Access) method is standardized as a third generation cellular mobile communication method, and services are started sequentially. In addition, HSDPA (High Speed Downlink Packet Access), which further increases the communication speed, has been standardized and the service is about to start.

  On the other hand, in 3GPP, the evolution of third generation wireless access (Evolved Universal Terrestrial Radio Access, hereinafter referred to as EUTRA) is being studied. An OFDM (Orthogonal Frequency Division Multiplexing) scheme has been proposed as a downlink of EUTRA. As the EUTRA technology, a technique such as an adaptive modulation and coding scheme (AMCS) based on adaptive radio link control (link adaptation, link adaptation) such as channel coding is applied to the OFDM scheme. Has been.

  In order to efficiently perform high-speed packet data transmission, the AMCS method is an error correction method, an error correction coding rate, a data modulation multi-value number, a time / frequency axis in accordance with the channel conditions of each mobile station. This is a method for switching radio transmission parameters (hereinafter referred to as AMC mode) such as code spreading factor (SF) and multi-code multiplexing number. For example, for data modulation, as the propagation path condition becomes better, switching from QPSK (Quadrature Phase Shift Keying) modulation to higher-efficiency multi-value modulation such as 8PSK modulation, 16QAM (Quadrature Amplitude Modulation) modulation, etc. The maximum throughput of the communication system can be increased.

  In addition, various proposals such as a multicarrier communication system and a single carrier communication system have been proposed for the uplink of EUTRA, and the ratio of peak power to average power (PAPR) is higher than the multicarrier communication system such as the OFDM system. VSCRF-CDMA (Variable Spreading and Chip Repetition Factors: variable spreading factor / chip repetition) method), IFDMA (Interleaved Frequency Division Multiple Access) method, and DFT-spread method, which are excellent in the characteristics of DFT-spread method. ing.

FIG. 1 is a diagram for explaining an uplink / downlink channel configuration assumed for EUTRA based on the proposal of 3GPP.
In the downlink of EUTRA, the downlink pilot channel DPiCH (Downlink Pilot Channel), the downlink synchronization channel DSCH (Downlink Synchronization Channel), the downlink common control channel DCCCH (Downlink Common Control Channel control) It is composed of a Shared Control Signaling Channel) and a downlink shared data channel DSDCH (Downlink Shared Data Channel) (Non-patent Document 1).

  The uplink of EUTRA includes an uplink pilot channel UPiCH (Uplink Pilot Channel), a contention base channel CBCH (Contention-based Channel), and an uplink scheduling channel USCH (Uplink Scheduling Channel) (Non-patent Document 2). .

  In the downlink of EUTRA, the downlink pilot channel DPiCH includes a downlink common pilot channel DCPiCH (Downlink Common Pilot Channel) and a downlink dedicated pilot channel DDPiCH (Downlink Dedicated Pilot Channel).

  The downlink common pilot channel DCPiCH corresponds to a pilot channel CPICH (Common Pilot Channel) of the W-CDMA system, and is used for estimation of downlink radio channel characteristics in the AMCS system, and for channel loss measurement of cell search and uplink transmission power control. in use. The downlink dedicated pilot channel DDPiCH is transmitted to an individual mobile station from an antenna having a radio propagation path characteristic different from that of a cell shared antenna such as an adaptive array antenna, or to a mobile station having low reception quality as necessary. It can also be used for the purpose of reinforcing the downlink common pilot channel DCPiCH.

  The downlink synchronization channel DSCH corresponds to a synchronization channel SCH (Synchronization Channel) of the W-CDMA system, and performs mobile station cell search, OFDM signal radio frame, time slot, TTI (Transmission Time Interval), and OFDM symbol timing synchronization. in use.

  The downlink common control channel DCCCH includes a W-CDMA first common control physical channel P-CCPCH (Primary Common Control Physical Channel), a second common control physical channel S-CCPCH (Secondary Common Control Physical Channel), and a page. Common control information such as broadcast information corresponding to the indicator channel PICH (Paging Indicator Channel), paging indicator PI (Paging Indicator) information, paging information, and downlink access information is included.

  The downlink shared control signaling channel DSCSCH corresponds to the control information channel of the high-speed physical downlink shared channel HS-PDSCH (High Speed Shared Linked Channel) of the HSDPA method, and is shared by a plurality of mobile stations and is connected to each mobile station at a high speed downlink. Information necessary for demodulating the shared channel HS-DSCH (High Speed Downlink Shared Channel) (modulation method, spreading code, etc.), information necessary for error correction decoding processing and HARQ (Hybrid Automatic Repeat request) processing, and radio resources (frequency) , Time) is used for transmission of scheduling information and so on.

The downlink shared data channel DSDCH corresponds to the packet data channel of the high-speed physical downlink shared channel HS-PDSCH of the HSDPA method, and is used for transmission of packet data addressed to the mobile station from the upper layer.
In the uplink, the contention base channel UCBCH includes a fast access channel FACH (Fast Access Channel), a reserved channel RCH (Reservation Channel), and an uplink synchronization channel USCH (Uplink Synchronization Channel). This corresponds to a random access channel RACH (Random Access Channel) of the W-CDMA system.

The uplink scheduling channel USCH is composed of a shared control channel SCCH (Shared Control Channel) and a shared data channel SDCH (Shared Data Channel). The uplink dedicated data channel DPDCH (Dedicated Physical Data Channel) of the W-CDMA method and the HSDPA method HS -DSCH-related uplink dedicated physical control channel HS-DPCCH (Dedicated Physical Control for HS-DSCH), each mobile station is shared, mobile station packet data transmission, downlink channel quality information CQI (Channel Quality Indicator) ), Feedback information such as HARQ, uplink pilot, uplink Used to transmit such Kuchaneru control information.
The uplink pilot channel UPiCH is used for estimation of uplink radio channel characteristics in the AMCS scheme.

  FIG. 2 is a diagram illustrating a configuration of a downlink radio frame assumed for EUTRA based on the proposal of 3GPP. The downlink radio frame is configured in two dimensions by Chunk, which is a cluster of a plurality of subcarriers on the frequency axis, and a time slot TTI on the time axis. Chunk is composed of several subcarriers.

  For example, on the frequency axis, when the entire downlink spectrum (downlink frequency bandwidth) BW is 20 MHz, the Chunk frequency bandwidth Bch is 1.25 MHz, and the subcarrier frequency bandwidth Bsc is 12.5 kHz, the downlink In the radio frame, 16 Chunks are included, one Chunk includes 100 subcarriers, and the entire radio frame includes 1600 subcarriers. On the time axis, when one radio frame is 10 ms and TTI is 0.5 ms, the radio frame includes 20 TTIs. That is, one radio frame includes 16 Chunks and 20 TTIs, and one TTI includes a plurality of OFDM symbol lengths (Ts). In this example, the minimum radio resource unit that can be used by the mobile station is configured by one TTI (0.5 ms) with one Chunk (100 subcarriers). Also, one Chunk radio resource can be further divided.

  As shown in FIG. 2, the downlink common pilot channel DCPiCH is mapped to the head of each TTI, and the downlink dedicated pilot channel DDPiCH depends on the antenna usage status of the base station or the propagation path status of the mobile station, If necessary, it is mapped to the appropriate location of one TTI (eg, mapped to the center of the TTI).

  The downlink common control channel DCCCH and the downlink synchronization channel DSCH are mapped to the first TTI of the radio frame. Thus, by mapping the DCCCH and DSCH to the TTI at the beginning of the radio frame, the mobile station receives only the TTI at the beginning of the radio frame or the number of OFDM symbol lengths (Ts) within the TTI at the beginning of the radio frame in the idle mode. Then, it is possible to receive common control information such as cell search, timing synchronization, broadcast information, and paging information. In the idle mode, the mobile station can operate with intermittent reception IR (Intermittent Reception).

  The downlink shared control signaling channel DSCSCH is mapped to the head of each TTI, similarly to the downlink common pilot CPICH. Even if the mobile station is in packet communication, if there is no packet data addressed to itself in each TTI, intermittent reception is possible in which only the downlink shared control signaling channel DSCSCH is received.

  The downlink shared data channel DSDCH is divided in units of chunks and transmits packet data addressed to each mobile station based on the AMCS scheme. Each Chunk is assigned to a user (for example, the mobile stations MS1, MS2, and MS3 shown in FIG. 2) according to the propagation path status of each mobile station.

As shown in FIG. 2, in the time slot of TTI_1 and TTI_2, one Chunk unit is assigned to one user, and a Chunk of 1 Chunk or more is assigned to a user with good radio channel characteristics, so that the multi-user diversity effect is achieved. A user scheduling method for improving the throughput of the entire system by using the system has been proposed.
In addition, in the time slots of TTI_3, TTI_n-1, and TTI_n, a plurality of Chunk units and sub-TTI units are allocated to a plurality of users, and a plurality of Chunks are provided to users with poor radio propagation path characteristics due to cell boundaries, high-speed movement, etc. There has been proposed a user scheduling method for improving reception characteristics by using a frequency diversity effect by providing a wide frequency bandwidth across the network.

FIG. 3 is a diagram illustrating a configuration of an uplink radio frame assumed for EUTRA based on the proposal of 3GPP.
The uplink radio frame is configured in two dimensions by Chunk which is a cluster of a plurality of subcarriers on the frequency axis and a time slot TTI on the time axis. The Chunk is composed of several subcarriers. For example, on the frequency axis, when the entire uplink spectrum (uplink frequency bandwidth) BW is 20 MHz and the Chunk frequency bandwidth Bch is 1.25 MHz, The frequency axis of the link is composed of 16 Chunks. On the time axis, when one radio frame is 10 ms and TTI is 0.5 ms, 20 TTIs are included. That is, one radio frame includes 16 Chunks and 20 TTIs, and one TTI includes a plurality of symbol lengths. Therefore, in this example, the minimum radio resource unit that can be used by the mobile station is constituted by one TTI (0.5 ms) and one Chunk (1.25 MHz). Also, one Chunk radio resource can be further divided.

  As shown in FIG. 3, the uplink pilot channel UPiCH is mapped to the beginning and end of each TTI of the uplink scheduling channel USCH. The base station estimates a radio channel from the uplink pilot channel UPiCH from each mobile station and detects synchronization between the mobile station and the base station. Each mobile station can simultaneously transmit the uplink pilot channel UPiCH by using Distributed FDMA (comb-tooth spectrum), Localized FDMA (localized spectrum), or CDMA.

  As shown in FIG. 4, the contention base channel CBCH and the uplink scheduling channel USCH are multiplexed by a TDM (TIME Division Multiplexing) or TDM-FDM (TIME Division Multiplexing-Frequency Division Multiplexing) hybrid method, etc. The In addition to the contention-based channel multiplexing method, as shown in FIG. 22, the base station designates a contention-based channel band as broadcast information, and random access to the contention-based channel within the designated band. It is also proposed to perform (Non-patent Document 4).

  The contention base channel CBCH is divided in units of chunks, and when there is user data or control data that is not scheduled from the base station, each mobile station uses the distributed FDMA, the localized FDMA, or the CDMA, and uses the contention base channel CBCH. Those data can be transmitted to CBCH.

  Random access to the contention base channel CBCH is mainly intended to synchronize the transmission timing between mobile stations, and is a method of transmitting only the preamble part for measuring the synchronization timing between the base station and the mobile station, or A method for transmitting a preamble part for measuring synchronization timing between a base station and a mobile station and a payload part including information necessary for scheduling have been proposed (Non-patent Documents 4 and 5).

  The uplink scheduling channel USCH is divided in units of chunks, and each mobile station scheduled from the base station transmits packet data to the base station based on the AMCS scheme. Each Chunk is assigned to a user (for example, the mobile stations MS1, MS2, MS3, MS4, and MS5 shown in FIG. 3) according to the radio propagation path status of each mobile station.

  As a scheduling method performed for the uplink scheduling channel USCH, that is, a scheduling method for assigning Chunks to users according to the radio channel conditions of each mobile station, the Chunk band in the frequency domain is determined in advance, and only the time domain On the other hand, the radio propagation of each mobile station for both the frequency domain and the time domain is scheduled according to the radio channel conditions of each mobile station (Time domain channel-dependent scheduling using pre-assigned frequency bandwidth). Scheduling according to road conditions (Frequency and time domain channel-dependent scheduling), The hybrid method of the above two methods have been proposed (Non-Patent Document 3).

In addition, EUTRA technical requirements (Non-Patent Document 6) have been proposed, and spectrum flexibility is required for fusion and coexistence with existing 2G and 3G services. Here, support for spectrum allocations of different sizes of spectrum (eg, 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 20 MHz) is required, and different frequency bandwidths (eg, Support for mobile stations having transmission and reception capabilities of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, and 20 MHz) is also required.
R1-050707 “Physical Channel and Multiplexing in Evolved UTRA Downlink”, 3GPP TSG RAN WG1 Meeting # 42 London, UK, August 29-September 2, 2005 R1-050850 “Physical Channel and Multiplexing in Evolved UTRA Uplink”, 3GPP TSG RAN WG1 Meeting # 42 London, UK, August 29-September 2, 2005 R1-050701 “Channel-Dependent Scheduling Method for Single-Carrier FDMA Radio Access in Evolved UTRA Uplink”, 3GPP TSG RAN WG1 p R1-051391 “Random Access Transmission for Scalable Multiple Bandwidth in Evolved UTRA Uplink”, 3GPP TSG RAN WG1 Meeting # 43 Seoul, Korea5, Nove7 R1-051445 “E-UTRA Random Access”, 3GPP TSG RAN WG1 Meeting # 43 Seoul, Korea, November 7-11, 2005 3GPP TR (Technical Report) 25.913, V2.1.0 (2005-05), Requirements for evolved Universal Terrestrial Radio Access (UTRA) and Universal Ref.

  However, in the above document, the frequency position designation method used by mobile stations of a mobile station class having transmission / reception capabilities of different frequency bandwidths in uplink communication and the frequency band used at the time of random access to the contention base channel CBCH are specifically described. Specific examples are not shown.

In addition, at the start of uplink communication, the mobile station does not know which frequency band and how much bandwidth should be transmitted for random access to the contention base channel CBCH. If the access is simply random, the access concentrates in a certain frequency band, collisions between users occur frequently, and the frequency utilization efficiency becomes poor.
In addition, when a mobile station performs random access to the contention base channel CBCH with the frequency bandwidth of the transmission capability determined by the mobile station class, the mobile station having a narrow use frequency band is affected by the mobile station having a wide use frequency band. The collision probability will be very high.

  The present invention has been made in order to solve the above-described problem. In the uplink, a use frequency band adapted to a mobile station of a different mobile station class is determined, and a collision that occurs at the time of random access to a contention base channel. Mobile station apparatus, base station apparatus, mobile station apparatus random access method, use frequency band mapping method, scheduling method, program, and recording medium that can reduce radio resources and efficiently use radio resources It is intended to do.

  In order to solve the above problems, a first technical means is a mobile station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, the mobile station apparatus The mobile station device performs random access to the base station device from the information held by the device and enabling identification of the mobile station device, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device. A random access use frequency band is calculated, and random access is performed in the calculated random access frequency band.

  A second technical means is a mobile station device used in a mobile communication system using a mobile station device of a different mobile station class and a base station device of a different base station class, and the mobile station device holds the mobile station device. Random access use frequency band for the mobile station device to perform random access to the base station device from the information that can be specified, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device, and random A random access period for performing access is calculated, and random access is performed in the calculated random access frequency band and in the calculated random access period.

  According to a third technical means, in the first or second technical means, information enabling the mobile station device to identify the mobile station device, the natural frequency bandwidth of the mobile station device, and the natural frequency band of the base station device Based on the width, the use frequency band of the uplink / downlink between the base station apparatus and the mobile station apparatus is determined.

  A fourth technical means is a base station device used in a mobile communication system using a mobile station device of a different mobile station class and a base station device of a different base station class, wherein the base station device is a random mobile station device. It is characterized by performing uplink scheduling for transmitting the next data in the accessed frequency band.

  According to a fifth technical means, in the fourth technical means, the base station apparatus transmits only position information in the time axis direction as scheduling information transmitted to the mobile station apparatus when performing uplink scheduling. It is what.

  A sixth technical means is a base station device used in a mobile communication system using a mobile station device of a different mobile station class and a base station device of a different base station class, wherein the base station device is a base station device A response signal for random access is returned in a frequency band corresponding to a frequency band in which random access is performed to the station apparatus.

  A seventh technical means is a random access method for allowing a mobile station apparatus to randomly access a base station apparatus in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class. The mobile station device makes random access to the base station device from the information held by the mobile station device that makes it possible to identify the mobile station device, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device. A random access use frequency band for performing is calculated, and random access is performed in the calculated random access frequency band.

  An eighth technical means is a random access method for allowing a mobile station apparatus to randomly access a base station apparatus in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class. The mobile station device makes random access to the base station device from the information held by the mobile station device that makes it possible to identify the mobile station device, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device. The random access use frequency band for performing the random access and the random access period for performing the random access are calculated, and the random access is performed in the calculated random access frequency band and the calculated random access period. is there.

  A ninth technical means is a mapping method for mapping a frequency band used by a mobile station apparatus in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class. Uplink / downlink between the base station device and the mobile station device based on the information held by the station device and enabling the mobile station device to be identified, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device The use frequency band of the link is determined.

  A tenth technical means is a scheduling for scheduling an uplink from a mobile station apparatus by a base station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class. The method is characterized in that the base station apparatus performs uplink scheduling for transmitting next data in a frequency band in which the mobile station apparatus has performed random access.

  The eleventh technical means is characterized in that, in the tenth technical means, the base station apparatus transmits only position information in the time axis direction as scheduling information transmitted to the mobile station apparatus when performing uplink scheduling. It is what.

  The twelfth technical means is a scheduling for scheduling an uplink from a mobile station apparatus by a base station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class. A frequency corresponding to a frequency band in which a mobile station device performs random access to a base station device when the base station device performs random scheduling from the mobile station device and performs uplink scheduling. A response signal for random access is returned in a band.

  A thirteenth technical means for causing a computer to realize the function of the mobile station apparatus in any one of the first to third technical means or the base station apparatus in any one of the fourth to sixth technical means. It is a program.

  The fourteenth technical means is a recording medium on which the program in the thirteenth technical means is recorded so as to be readable by a computer.

  According to the present invention, the mobile station's uplink / downlink use frequency band and random access band are determined from the information that enables identification of the mobile station, the mobile station's natural frequency bandwidth, and the base station's natural frequency bandwidth. By determining, it is possible to improve uplink frequency utilization efficiency and to efficiently execute base station control for specifying a used frequency band for a specific mobile station.

  In particular, according to the present invention, mobile stations can be distributed in each frequency band that can be used by the mobile station, the number of mobile station devices that use a specific frequency band is reduced, and the probability of occurrence of mobile station collisions in the frequency band is reduced. Thus, the frequency utilization efficiency can be increased.

  3 and 4 are diagrams for explaining an example of an uplink channel configuration in a mobile communication system to which the present invention can be applied, and a contention-based channel (CBCH: Content-based Channel) studied in 3GPP and a schedule. This shows a configuration in which a channel SCH (Schedule Channel) is frequency / time division multiplexed.

  As described above, in FIG. 3, the uplink pilot channel UPiCH is mapped to the beginning and end of each TTI of the uplink scheduling channel USCH. The base station estimates a radio channel from the uplink pilot channel UPiCH from each mobile station and detects synchronization between the mobile station and the base station. Each mobile station can simultaneously transmit the uplink pilot channel UPiCH by using Distributed FDMA, Localized FDMA, or CDMA.

  The contention base channel CBCH and the uplink scheduling channel USCH are multiplexed and mapped by TDM or a TDM-FDM hybrid method as shown in FIG.

  FIG. 5 is a diagram illustrating a configuration example of a mobile station. The mobile station 100 includes a channel encoding unit 101, a data control unit 102, a modulation unit 103, a scheduling unit 104, an OFDM demodulation unit 105, a channel estimation unit 106, a control data extraction unit 107, a synchronization correction unit 108, and a channel decoding unit 109. , A wireless control unit 110 and a wireless unit 111.

  The transmission data is input to the channel encoding unit 101 and is encoded using the AMC information encoding method passed from the scheduling unit 104. The data control unit 102 arranges the control data, the CQI information, and the transmission data in accordance with an instruction from the scheduling unit 104 so that the control data, the CQI information, and the transmission data are transmitted using the contention base channel CBCH or the uplink scheduling channel USCH.

  Modulation section 103 modulates control data and transmission data using the modulation scheme of AMC information passed from scheduling section 104. Further, the subcarriers are mapped based on the mapping information from the scheduling unit 104. As the uplink communication scheme, a single carrier scheme such as DFT-spread OFDM or VSCRF-CDMA is assumed, but a multicarrier scheme such as the OFDM scheme may be used. The synchronization correction unit 108 determines the transmission timing from the synchronization information passed from the control data extraction unit 107, and passes the data modulated so as to match the transmission timing to the radio unit 111.

  The radio unit 111 is set to the radio frequency instructed from the radio control unit 110, up-converts the modulated data to the radio frequency, and transmits the radio data to the base station. Radio section 111 receives downlink data from the base station, down-converts it into a baseband signal, and passes the received data to OFDM demodulation section 105. Channel estimation section 106 estimates radio channel characteristics from downlink pilot channel DPiCH and passes the estimation result to OFDM demodulation section 105. Further, in order to notify the base station of the radio propagation path estimation result, the base station converts it into CQI information, and passes the CQI information to the data control unit 102 and the scheduling unit 104.

  The OFDM demodulator 105 demodulates received data from the radio channel estimation result of the channel estimator 106 and the downlink AMC information extracted from the control data extractor 107. The control data extraction unit 107 separates the received data into user data and control data (downlink shared control signaling channel SCSCH, downlink common control channel DCCCH). Downlink AMC information in the control data is sent to OFDM demodulation section 105 and channel decoding section 109, and uplink AMC information and scheduling information are passed to scheduling section 104. Also, uplink synchronization information is passed to the synchronization correction unit 108. The channel decoding unit 109 decodes data from the AMC information from the control data extraction unit 107 and passes the received data to the upper layer.

  The radio control unit 110 calculates the center frequency of the used frequency band of the uplink and downlink from the radio control information (mobile station class information, base station specific frequency band information, subscriber identification information), and uses the radio frequency information as a radio unit. To 111.

  FIG. 6 is a diagram illustrating a configuration example of a base station. The base station 200 includes a channel encoding unit 201, a data control unit 202, an OFDM modulation unit 203, a scheduling unit 204, a demodulation unit 205, a channel estimation unit 206, a control data extraction unit 207, a channel decoding unit 208, and a synchronization detection unit 209. The wireless unit 210 is configured.

  The transmission data is input to the channel encoding unit 201 and encoded using the AMC information encoding method passed from the scheduling unit 204. The data control unit 202 maps the control data to the common control channel CCCH, the synchronization channel SCH, the pilot channel PiCH, and the shared control channel SCSCH according to the instruction from the scheduling unit 204, and transmits the transmission data for each mobile station 100 to the shared data channel SDCH. Map.

  The OFDM modulation unit 203 multiplies data modulation, serial / parallel conversion of an input signal, spreading code and scrambling code, performs OFDM signal processing such as IFFT (Inverse Discrete Fourier Transform) conversion, CP (Cyclic Prefix) insertion, and filtering. Generate an OFDM signal. In addition, data modulation of each subcarrier is performed by the modulation method of AMC information delivered from the scheduling unit.

The radio unit 210 up-converts OFDM-modulated data to a radio frequency and transmits it to the mobile station 100. Radio section 210 receives uplink data from mobile station 100, down-converts it to a baseband signal, and passes the received data to demodulation section 205, channel estimation section 206, and synchronization detection section 209.
Channel estimation section 206 estimates the radio channel characteristics from uplink pilot channel UPiCH, and passes the estimation result to demodulation section 205. Further, the wireless channel estimation result is passed to the scheduling unit 204 for uplink scheduling.

The synchronization detection unit 209 detects a synchronization shift (shift in transmission timing) of the mobile station 100 from the preamble transmitted through the uplink pilot channel UPiCH or the contention base channel CBCH, and detects the synchronization shift information by the demodulation unit 205 and the data control unit. 202. Demodulator 205 demodulates the received data from the radio channel estimation result of channel estimator 206, synchronization loss information from synchronization detector 209, and downlink AMC information extracted from control data extractor 207.
The uplink communication scheme is assumed to be a single carrier scheme such as DFT-spread OFDM or VSCRF-CDMA, but may be a multicarrier scheme such as the OFDM scheme.

  The control data extraction unit 207 separates the received data into user data (uplink shared data channel USDCH) and control data (uplink shared control signaling channel USCSCH). Among the control data, uplink AMC information is sent to the demodulation section 205 and channel decoding section 208, and downlink CQI information is passed to the scheduling section. The channel decoding unit 208 decodes data from the AMC information from the control data extraction unit 207 and passes the received data to the upper layer.

The scheduling unit 204 includes a DL scheduling unit 204a that performs downlink scheduling and a UL scheduling unit 204b that performs uplink scheduling.
The DL scheduling unit 204a uses the CQI information notified from the mobile station 100 and the data information of each user notified from the higher layer to perform scheduling for mapping user data to each downlink channel and to modulate each data. Of AMC.

  The UL scheduling unit 204b also performs scheduling and data mapping for mapping user data to each uplink channel from the uplink radio channel estimation result from the channel estimation unit 206 and the resource allocation request from the mobile station 100. AMC for modulation is calculated.

In the embodiment according to the present invention, a method for specifying a used frequency band position that can be applied to the mobile communication system as described above and that allows mobile stations of different mobile station classes to randomly access the natural frequency bandwidth of the base station apparatus. Propose.
At the start of uplink communication (especially when the mobile station is powered on), the mobile station does not know which frequency band and how much bandwidth to transmit random access to the contention base channel CBCH. If the access is simply random at this time, the access concentrates in a certain frequency band, and collisions between users frequently occur, resulting in a poor frequency utilization efficiency.

FIG. 7 is a diagram for explaining a state in which numbering is performed on uplink frequency bands in the embodiment according to the present invention.
Here, as shown in FIG. 7, for example, when the natural frequency bandwidth of the base station is 20 MHz, the uplink frequency bands used by the respective mobile stations of different mobile station classes are numbered. The configuration of each number assigned to the use frequency band of the mobile station will be described below. The configuration shown in FIG. 7 is based on the premise that the used frequency bands of the mobile stations do not overlap.

As shown in FIG. 7, the use frequency band position of a 20 MHz or 15 MHz mobile station class mobile station is inevitably determined because there is only one option. Further, there are two candidates (0 and 1 (binary notation)) for the use frequency band position of the mobile station of the 10 MHz mobile station class, and the use frequency band position of the mobile station of the 5 MHz mobile station class is 4 There are candidates (00, 01, 10, 11). In addition, there are 8 candidates (numbered 000 to 111) for the frequency band position of the mobile station of the 2.5 MHz mobile station class, and the frequency band position of the mobile station of the 1.25 MHz mobile station class is 16 There are candidates (0000 to 1111).
The mobile station of each mobile station class selects an appropriate frequency band from the above usable frequency band candidates.

In addition, when the mobile station performs random access to the contention base channel CBCH with the frequency bandwidth of the transmission capability defined in the mobile station class, the mobile station having a narrow use frequency band due to the influence of the mobile station having a wide use frequency band The collision probability will be very high.
From the above, as shown in FIG. 7, by making the access unit to the contention base channel the minimum unit that can be transmitted by the mobile station in the frequency band selected by the mobile station of each mobile station class Reduce the collision frequency. Here, the minimum unit is set to 1.25 MHz. However, the minimum unit may be 2.5 MHz, 5 MHz, etc., depending on the system configuration. Alternatively, a frequency bandwidth of 1.25 MHz or less (for example, 0.625 MHz, 0.3125 MHz, etc.) that is the minimum natural frequency bandwidth of the base station may be set as the minimum unit.

  In addition, by distributing mobile stations in each frequency band in advance, the number of mobile stations that can access the contention base channel for one frequency band is reduced, and the probability of occurrence of collision is reduced in one frequency band. By making the collision probability constant in the band, fair random access is performed.

  The frequency band used by the mobile station for transmission to the contention base channel is defined as a random access use frequency band. The frequency band position of the random access use frequency band is included in the use frequency band of the mobile station defined in FIG. Further, one random access use frequency band includes mobile stations of different mobile station classes.

FIG. 8 is a diagram for explaining a calculation example of the random access use frequency. For example, the number 0010 shown in FIG. 8 uses the random access use frequency band of 0010 at the use frequency band position of 00 when a mobile station of the 5 MHz mobile station class performs random access transmission to the contention base channel. It shows that
At the time of random access transmission to the contention base channel, mobile stations that randomly access the contention base channel are limited to a specific frequency band in advance by allocating mobile stations to the uplink transmission frequency region as described above. As a result, the probability of collision can be reduced.

Further, when the contention base channel is mapped to a plurality of TTIs in one frame, it is possible to disperse the mobile stations in the frequency domain and the time domain (FDM / TDM) and further subdivide them. As a result, since mobile stations that perform random access are dispersed in both frequency and time domains, the probability of collision between mobile stations can be greatly reduced.
Furthermore, with regard to the time domain dispersion, further subdivision can be performed by a combination including dispersion in frame units.

Here, the time for the mobile station to transmit to the contention base channel is defined as a random access period.
FIG. 9 is a diagram for explaining a calculation example of a random access use frequency and a random access period. For example, the number 10100110 shown in FIG. 9 is a contention base in which the mobile station of the 5 MHz mobile station class uses the 0010 random access use frequency band at the 00 use frequency band position during the 1010 random access period. It shows that random access transmission is performed to the channel.

By distributing mobile stations to the transmission frequency domain of uplink signals and the time domain of frames and TTIs at the time of random access as described above, mobile stations that perform random access transmit in advance the probability of collision with other mobile stations. Can be lowered.
The time-domain dispersion can be defined and used as a re-random access transmission time (frame / TTI) interval when there is no response from the base station during random access to the contention base channel.

  10 to 13 are diagrams showing a state in which numbering of frequency band candidates for mobile stations of different mobile station classes is numbered when the base station has a natural frequency bandwidth of 15 MHz, 10 MHz, 5 MHz, and 2.5 MHz. FIG. 10 shows the case where the natural frequency bandwidth of the base station is 15 MHz, FIG. 11 shows the case where the natural frequency bandwidth of the base station is 10 MHz, and FIG. 11 shows the case where the natural frequency bandwidth of the base station is 5 MHz. 12 shows a case where the natural frequency bandwidth of the base station is 2.5 MHz. Thus, by performing numbering corresponding to the natural frequency bandwidth of the base station, it is possible to flexibly deal with the natural frequency bandwidth of the base station.

When accessing the contention base channel, transmission from the mobile station starts, and the above specification cannot be made by communicating between the base station and the mobile station. The specified subscriber specific information and / or mobile station specific information is used. This subscriber-specific information or mobile station-specific information includes the IMSI (International Mobile Subscriber Identity), IMEI (International Mobile Equipment Identity) used in the W-CDMA system, the IP address assigned to the mobile station, and the mobile station serial number. This is information for identifying a subscriber or terminal such as a number or a unique number generated by a random number. Also, TMSI (Temporary Mobile Subscriber Identity), TMEI (Temporary Mobile Equipment Identity) assigned from the base station may be used.
As an example, description will be made here based on IMSI.

The above used frequency band position, random access used frequency band, and random access period include the subscriber identification information IMSI (IMSI = 1, 2, 3,..., N) and the base station specific frequency bandwidth MBnb (Node). B Maximum Band, MBnb = 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz) and the natural frequency bandwidth Bn of the mobile station.
With reference to FIG. 9 again, the calculation method of the used frequency band position, the random access used frequency band, and the random access period will be described in detail.

  Here, the subscriber identification information IMSI = 101010010100010 (binary notation), the natural frequency bandwidth of the mobile station Bn = 5 MHz, the natural frequency bandwidth of the base station MBnb = 20 MHz, the bandwidth transmitted by the mobile station in the contention base channel It is assumed that Bim = 1.25 MHz. Here, the use frequency band position number Ps for specifying the use frequency band position, the number RAf for specifying the random access use frequency band, and the number RAt for specifying the random access period are calculated. Here, the contention base channel in one frame is 2 TTIs, and the interval at which each mobile station can randomly access is once in 8 frames. Also, the location of the contention base channel shall be reported by the base station using CCCH.

  The lower 4 bits of 10101010 calculated by the calculation of the subscriber identification information IMSI mod 256 are the use frequency band position number Ps is 00 of the 5 MHz band, and the number RAf specifying the random access use frequency band is 0010. It shows that there is. In the upper 4 bits, the number RAt for specifying the random access period is number 1010, and indicates the position of the frame / TTI for random access.

A calculation formula that generalizes the above processing is shown below.
Number of frequency bands used for random access
(RAg) = MBnb (MHz) / Bim (MHz) (Formula 1)
Number of frequency bands used for random access within the frequency band used
(RAf_s) = Bn (MHz) / Bim (MHz) (Formula 2)
Random access use frequency band number (RAf) = IMSI mod RAg (Formula 3)
Random access period number (RAt) = IMSI / RAg mod RAt_s (Formula 4)
Number of use frequency band position candidates (Ns) = MBnb / Bn (Formula 5)
Use frequency band position number (Ps) = IMSI / RAf_s mod Ns (Formula 6)

However, if there are Nt TTI contention base channels in one frame and access to the contention base channel is permitted every Nf frame,
The random access period number RAt_s is:
RAt_s = Nt × Nf (Expression 7)

FIG. 14 is a diagram for explaining another example of the calculation method of the used frequency band position, the random access used frequency band, and the random access period. The subscriber identification information IMSI = 101010010100010 (binary notation), the mobile station The calculation method when the natural frequency bandwidth Bn = 5 MHz and the natural frequency bandwidth MBnb of the base station = 15 MHz is shown. In this case, using the above formula, the used frequency band position number and the random access used frequency band are as follows.
Here, it is assumed that the contention base channel is 1 TTI within one frame and access to the contention base channel is permitted for each frame.

Number of frequency bands used for random access (RAg) = 15 / 1.25 = 12 (Formula 8)
Number of frequency bands used for random access within the frequency band used
(RAf_s) = 5 / 1.25 = 4 (Formula 9)
Random access frequency band number
(RAf) = 216666 mod 12 = 0110 (Formula 10)
Number of use frequency band position candidates (Ns) = 15/5 = 3 (Formula 11)
Use frequency band position number (Ps) = 21666/4 mod 3 = 01 (Formula 12)

FIG. 15 is a diagram for explaining still another example of a calculation method of a used frequency band position, a random access used frequency band, and a random access period. Subscriber identification information IMSI = 101010010100100 (binary notation), mobile station This shows a calculation method when the natural frequency bandwidth Bn = 15 MHz and the base station natural frequency bandwidth MBnb = 20 MHz. In this case, using the above formula, the used frequency band position number and the random access used frequency band are as follows.
Here, it is assumed that the contention base channel is 1 TTI within one frame and access to the contention base channel is permitted for each frame.

Number of frequency bands used for random access (RAg) = 20 / 1.25 = 16 (Formula 13)
Number of frequency bands used for random access within the frequency band used
(RAf_s) = 15 / 1.25 = 12 (Formula 14)
Random access frequency band number
(RAf) = 21540 mod 16 = 0100 (Formula 15)
Number of use frequency band position candidates (Ns) = 20/15 = 1 (Expression 16)
Use frequency band position number (Ps) = 21540/12 mod 1 = 0 (Formula 17)

  When the base station natural frequency bandwidth MBnb is 20 MHz and the mobile station natural frequency bandwidth Bn is 15 MHz, the remaining 5 MHz frequency band cannot be used in the mobile station. For example, as shown in FIG. 15, when the use frequency band position of the mobile station of the 15 MHz mobile station class is fixed and arranged at the center of the base station natural frequency bandwidth of 20 MHz, the mobile station uses the above calculation method. There is a case where the random access use frequency band position corresponds to the left and right 2.5 MHz bands that cannot be performed. As means for avoiding this, the base station natural frequency bandwidth MBnb is set to 15 MHz and calculated, and the random access use frequency band position is specified using the number sequence for the base station natural frequency bandwidth 15 MHz shown in FIG. A way to do this is considered.

  As another method, the use frequency band position of the mobile station of the 15 MHz mobile station class is made variable so that it can be shifted from the center frequency of 15 MHz to the left and right by 2.5 MHz. As shown in FIG. 15, the use frequency band position candidates (a) to (e) of five mobile stations are conceivable, and the use frequency band position is selected based on the random access use frequency band number. This makes it possible to efficiently arrange mobile stations of the 15 MHz mobile station class in a base station having a natural frequency bandwidth of 20 MHz.

  The above method can also be applied to a mobile station class other than 15 MHz. It is possible to flexibly configure the use frequency band by associating and specifying the random access use frequency band number and the use frequency band without fixing the configuration of the use frequency band of 15 MHz, 10 MHz, 5 MHz, and 2.5 MHz. It is. For example, in the case of a mobile station of the 5 MHz mobile station class, as shown in FIG. 16, it is possible to configure the use frequency band in an overlapping manner.

  Next, the base station does not know which downlink frequency band should be used to send back an ACK (Acknowledgement) to the mobile station that has randomly accessed the contention base channel. Also, the mobile station does not know which downlink frequency band should be monitored to detect ACK from the base station. For this reason, the downlink frequency band corresponding to the frequency band randomly accessed to the uplink is used.

  Based on the calculated use frequency band position number (Ps) and random access use frequency band number (RAf), the uplink / downlink RF center frequency and channel number UARFCN (UTRA Absolute Radio Frequency Number, of the mobile station) Reference 7); 3GPP TS 25.101, V6.8.0 (2005-06), User Equipment (UE) radio transmission and reception (FDD), http://www.3gpp.org/ftp/hml/spec info / 25-series.htm) can be calculated. FIG. 17 shows the operating band.

First, the uplink center frequency NBfc_ul of the base station is calculated from the natural frequency bandwidth MBnb of the base station and the downlink center frequency NBfc_dl of the base station.
NBfc_ul = NBfc_dl-190 (MHz) (Formula 18)
Then, the minimum frequency UL_NBfmin and the maximum frequency UL_NBfmax of the uplink bandwidth of the base station are calculated.
UL_NBfmin = NBfc_ul−MBnb / 2 (Formula 19)

Next, the center frequency UL_Fs of the uplink use frequency band of the mobile station and the random access use frequency UL_Fra are calculated.
UL_Fs = UL_NBfmin + Bn · (2Ps + 1) / 2 (MHz) (Formula 20)
UL_Fra = UL_NBfmin + Bim · (2Pim + 1) / 2 (MHz)
(Formula 21)

For example, when the base station natural frequency bandwidth MBnb = 20 MHz and the base station downlink center frequency NBfc = 2144.9 MHz, the base station uplink center frequency NBfc_ul and the base station uplink bandwidth minimum frequency UL_NBfmin are: ,
NBfc_ul = NBfc_dl-190 = 1954.9 MHz (Formula 22)
UL_NBfmin = NBfc_ul-MBnb / 2
= 1954.9-20 / 2 = 1944.9 MHz (Formula 23)
It becomes.

In the case of FIG. 8, the center frequency UL_Fs and the random access use frequency UL_Fra of the uplink use frequency band of the mobile station are (Bn = 5 MHz, MBnb = 20 MHz, Bim = 1.25 MHz, Ps = 0, RAf_S = 2, Ns = 4)
UL_Fs = UL_NBfmin + Bn · (2Ps + 1) / 2
= 1944.9 + 5 × (2 × 0 + 1) / 2
= 1947.4 (MHz) (Formula 24)
UL_Fra = UL_NBfmin + Bim · (2Pim + 1) / 2
= 1944.9 + 1.25 × (2 × 2 + 1) / 2
= 1948.025 (MHz) (Formula 25)
It is.

The center frequency DL_Fs of the use frequency band of the downlink of the mobile station is
DL_Fs = UL_Fs + 190 = 2137.4 (MHz) (Formula 26)
The center frequency DL_Fra of the mobile station's downlink random access ACK reception frequency band is:
DL_Fra = UL_Fra + 190 = 21388.025 (MHz) (Formula 27)
It becomes.
FIG. 18 shows the frequency relationship between the uplink and the downlink.

FIG. 19 is a flowchart for explaining an example of processing from power-on of a mobile station to location registration.
The mobile station performs cell search after power is turned on (S1). Broadcast information is transmitted from the base station (S11). Here, CPICH, SCH, and CCCH are periodically transmitted from the base station. The mobile station receives broadcast information, selects a cell from CPICH and SCH, and acquires base station information such as the natural frequency bandwidth of the base station, the number of contention base channels CBCH, and random access period information from the CCCH. (S2).

  After acquiring the base station information, the mobile station uses the subscriber-specific information (IMSI, etc.), the acquired natural frequency bandwidth of the base station, the position and number of contention base channels CBCH, and the random access period information to A use frequency band, a random access use frequency band, and a random access period are calculated (S3). After the calculation, random access to the contention base channel is performed for location registration in the calculated use frequency band, random access use frequency band, and random access period (S4).

  The data transmitted from the mobile station to the base station at this time is information for identifying the mobile station that has accessed the contention base channel, which is called a signature in W-CDMA (here, temporarily called a signature). And information (preamble) for synchronizing synchronization between the base station and the mobile station is required. Then, individual mobile station information (IMSI, mobile station class, etc.), information necessary for scheduling, etc. are transmitted when the transmission data capacity is sufficient, and when the transmission data capacity is limited, Is transmitted to the base station.

  Here, a case where only the preamble (including the signature) is transmitted will be described. When the base station recognizes that the mobile station has accessed the contention base channel, it performs a random access process (S12). Here, scheduling is performed for the mobile station to transmit the next data in the frequency band randomly accessed to the scheduling channel, the synchronization shift between the base station and the mobile station is calculated from the preamble, and the uplink randomly accessed frequency band. The same signature as the signature transmitted from the mobile station, the synchronization information, and the scheduling information are transmitted within a certain period Tra to the DSCSCH in the downlink frequency band corresponding to. FIG. 20 is a diagram illustrating a configuration example of an ACK format transmitted in the downlink.

Alternatively, the above information is transmitted on the first CCCH of the next frame. Here, when the base station performs scheduling for the mobile station, the base station does not know which mobile station class the mobile station randomly accessed has, and how many usable frequency bands the mobile station has. Then, uplink scheduling is performed in a frequency band in which the mobile station randomly accesses the contention base channel.
Here, since the uplink frequency band that is randomly accessed is used for scheduling, scheduling information can be reduced. That is, only the TTI number for transmitting data on the uplink can be used as scheduling information transmitted from the base station to the mobile station.

The mobile station monitors the DSCSCH including the signature transmitted by the mobile station in the downlink frequency band corresponding to the frequency band randomly accessed in the uplink, and there is no data addressed to the mobile station within a certain period of time Tra (S5) A re-access to the contention base channel is prepared again (S9), and the contention base channel is accessed (S4).
In addition, when there is a signature transmitted by the mobile station, the mobile station demodulates the DSCSCH and extracts synchronization information and scheduling information. Then, by using the TTI number indicated by the scheduling information, the local station information such as the IMSI and the mobile station class and the information necessary for scheduling such as QoS and the amount of data are transmitted to make a scheduling request to the scheduling channel (S6). .

  The base station performs scheduling processing for the mobile station from information necessary for scheduling such as IMSI, mobile station class, QoS and data amount transmitted from the mobile station, and transmits scheduling information to the mobile station (S13). The scheduling performed at this time may be different from the use frequency band described above. In addition, the information that the mobile station to be transmitted identifies as the data addressed to its own station uses the previous signature or IMSI as identification information, but is based on a procedure determined in advance between the base station and the mobile station from the IMSI or the like. The identification information calculated by the above may be used.

  When uplink scheduling to the mobile station is performed, the mobile station starts position registration work with an upper layer and performs position registration. In this location registration, temporary subscriber identification information such as TMSI, TMEI, and a temporary IP address is transmitted to the mobile station together with the approval of location registration (S7, S8, S14). At the same time, a key exchange protocol and an authentication process are executed.

  FIG. 21 is a diagram for explaining a processing example from normal contention-based access to transmission of mobile station transmission data. When there is user data to be transmitted (S21), the mobile station accesses the contention base channel in the use frequency band, random access use frequency band, and random access period calculated at power-on (S22). At this time, the mobile station transmits a preamble to the base station. Individual mobile station information (IMSI, TMSI, mobile station class, etc.), information necessary for scheduling, etc. are transmitted when the transmission data capacity is sufficient, and when the transmission data capacity is limited, Transmitted to the base station.

  When the base station recognizes that the mobile station has accessed the contention base channel, it performs a random access process (S31). Here, scheduling is performed to transmit the next data to a scheduling channel in the same frequency band as the frequency band randomly accessed by the mobile station, synchronization deviation information is calculated, and the same signature as the signature transmitted by the mobile station is synchronized. Information and scheduling information are transmitted in the Tra for a certain period on the downlink.

The mobile station monitors the data including the signature transmitted by the mobile station on the downlink, and when there is a signature transmitted by the mobile station in response from the base station (S23), the mobile station demodulates the data, Extract scheduling information. Then, by using the TTI indicated by the scheduling information, the local station information such as IMSI or TMSI and the information necessary for scheduling such as QoS and the amount of data are transmitted to execute a scheduling request to the scheduling channel (S24).
If there is no data addressed to the own station within a certain period Tra (S23), re-access to the contention base channel is prepared again (S26), and the contention base channel is accessed (S22).

  The base station performs scheduling processing for the mobile station from information necessary for scheduling such as IMSI, mobile station class, QoS, and data amount transmitted from the mobile station, and transmits scheduling information to the mobile station (S32). The scheduling performed at this time may be different from the use frequency band described above. In addition, the information that the mobile station to be transmitted identifies as the data addressed to its own station uses the previous signature or IMSI as identification information, but is based on a procedure determined in advance between the base station and the mobile station from the IMSI or the like. The identification information calculated by the above may be used.

  When uplink scheduling to the mobile station is performed, data transmission from the mobile station to the scheduling channel is started (S25). The base station performs data processing using the transmitted IMSI and data (S33).

The above procedure shows the case where only the preamble is transmitted at the time of random access to the contention base channel, but the preamble and the mobile station specific information and scheduling information may be transmitted at the time of random access to the contention base channel. .
In this case, the mobile station class information indicating the mobile station specific information such as IMSI and the mobile station specific frequency bandwidth is transmitted to calculate the above-described mobile station uplink and downlink use frequency bands also in the base station. Can do. Then, uplink scheduling can be performed within the calculated use frequency bandwidth of the mobile station.

  Furthermore, even when the base station transmits an ACK for random access in the downlink, it can transmit an ACK within the used frequency bandwidth of the mobile station, and the mobile station monitors the used frequency band and ACK can be received. In this case, scheduling according to the mobile station class of the mobile station can be performed from the initial scheduling to the mobile station, and the uplink can be used efficiently.

As shown in FIG. 22 and FIG. 23, separately from the contention base channel multiplexing method, the base station designates the contention base channel band as broadcast information, and randomly assigns the contention base channel to the contention base channel. It has been proposed to access. (Non-Patent Document 4).
For example, as shown in FIG. 22, when the frequency band of the base station is 20 MHz, the contention base channel 20 MHz band is divided into 10 MHz bands to be contention base channel bands A and B. It is conceivable that information instructed to use such a band is notified, and the mobile station performs random access within the notified 10 MHz.

  Or, as shown in FIG. 23, with respect to the frequency band of the base station of 20 MHz, the use band of the contention base channel is set to 10 MHz, the remaining 10 MHz is used as the scheduling channel, and the contention base channel is notified to be 10 MHz. Notify as information. The mobile station may perform random access within the notified 10 MHz.

24 and 25 are calculation examples of the mobile station use frequency band and the random access use frequency band when the contention base channel frequency band is designated as 10 MHz with respect to the base station frequency band. This will be described below.
In this case, since the bandwidth accessible to the base station is limited to 10 MHz, the natural frequency band of the base station may be considered to be 10 MHz, and the used frequency band position, the random access used frequency band, and the random access period are expressed by the formula ( 28) to (32) are used as follows.

  It is assumed that subscriber identification information IMSI = 101010010100010 (binary notation) and the mobile station's natural frequency bandwidth Bn = 5 MHz. Here, it is assumed that the contention base channel is 1 TTI within one frame, and access to the contention base channel is permitted for each frame.

Random access frequency band (RAg) = 10 / 1.25 = 8 (Equation 28)
Number of frequency bands used for random access within the frequency band used
(RAf_s) = 5 / 1.25 = 4 (Formula 29)
Random access frequency band number
(RAf) = 21666 mod 8 = 010 (Equation 30)
Number of use frequency band position candidates (Ns) = 10/5 = 2 (formula 31)
Use frequency band position number (Ps) = 21666/4 mod 2 = 0 (formula 32)
Even when the base station limits the band of the contention base channel, the mobile station can be distributed to each frequency band.

It is a figure for demonstrating the channel structure of the uplink / downlink assumed about EUTRA based on the proposal of 3GPP. It is a figure which shows the structure of the downlink radio frame assumed based on the proposal of 3GPP about EUTRA. It is a figure which shows the structure of the uplink radio frame assumed based on the proposal of 3GPP about EUTRA. It is a figure for demonstrating the example of an uplink channel structure in the mobile communication system which can apply this invention. It is a figure which shows the structural example of a mobile station. It is a figure which shows the structural example of a base station. It is a figure for demonstrating a mode that numbering was performed to the frequency band of the uplink in embodiment which concerns on this invention. It is a figure for demonstrating the example of calculation of a random access use frequency. It is a figure for demonstrating the example of calculation of a random access use frequency and a random access period. It is a figure which shows a mode that the number of the use frequency band candidate with respect to the mobile station of a different mobile station class was numbered. It is another figure which shows a mode that the number of the use frequency band candidate with respect to the mobile station of a different mobile station class was numbered. FIG. 10 is still another diagram showing a state in which numbering is applied to candidates for use frequency bands for mobile stations of different mobile station classes. FIG. 10 is still another diagram showing a state in which numbering is applied to candidates for use frequency bands for mobile stations of different mobile station classes. It is a figure for demonstrating the other example of the calculation method of a use frequency band position, a random access use frequency band, and a random access period. It is a figure for demonstrating the example comprised so that the use frequency band of a mobile station might overlap. It is a figure for demonstrating the other example comprised so that the use frequency band of a mobile station might overlap. It is a figure which shows Operating Band. It is a figure for demonstrating the frequency relationship of an uplink and a downlink. It is a flowchart for demonstrating the process example from power activation of a mobile station to position registration. It is a figure which shows the structural example of the ACK format transmitted by a downlink. It is a figure for demonstrating the example of a process which performs contention base access at the time of normal, and transmits the transmission data of a mobile station. It is a figure for demonstrating the example which performs random access to the contention base channel within the designated zone | band. It is a figure for demonstrating the other example which performs the random access to the contention base channel within the designated zone | band. It is a figure for demonstrating the calculation example of the use frequency band of a mobile station, and the random access use frequency band when the frequency band of a contention base channel is designated as 10 MHz with respect to the frequency band of a base station. It is a figure for demonstrating the other example of calculation of the use frequency band of a mobile station, and the random access use frequency band at the time of designating the frequency band of a contention base channel to 10 MHz with respect to the frequency band of a base station.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Mobile station 101 ... Channel encoding part 102 ... Data control part 103 ... Modulation part 104 ... Scheduling part 105 ... OFDM demodulation part 106 ... Channel estimation part 107 ... Control data extraction part 108 ... Synchronization Correction unit 109 ... Channel decoding unit 110 ... Radio control unit 111 ... Radio unit 201 ... Channel encoding unit 202 ... Data control unit 203 ... OFDM modulation unit 204 ... Scheduling unit 204a ... DL scheduling unit 204b, UL scheduling unit, 205, demodulation unit, 206, channel estimation unit, 207, control data extraction unit, 208, channel decoding unit, 209, synchronization detection unit, 210, radio unit.

Claims (14)

  A mobile station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, the information held by the mobile station apparatus and enabling identification of the mobile station apparatus And, from the natural frequency bandwidth of the mobile station device and the natural frequency bandwidth of the base station device, the mobile station device calculates a random access use frequency band for performing random access to the base station device, A mobile station apparatus that performs the random access in the calculated random access frequency band.   A mobile station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, the information held by the mobile station apparatus and enabling identification of the mobile station apparatus A random access use frequency band for the mobile station apparatus to perform random access to the base station apparatus, and the random frequency bandwidth of the mobile station apparatus and the natural frequency bandwidth of the base station apparatus, A mobile station apparatus that calculates a random access period for performing access, and performs the random access in the calculated random access frequency band and in the calculated random access period.   3. The mobile station apparatus according to claim 1, wherein the mobile station apparatus includes information enabling the mobile station apparatus to be identified, a natural frequency bandwidth of the mobile station apparatus, and a natural frequency band of the base station apparatus. A mobile station apparatus characterized by determining an uplink / downlink use frequency band in the base station apparatus and the mobile station apparatus from a width.   A base station device used in a mobile communication system with a mobile station device of a different mobile station class and a base station device of a different base station class, the base station device having a frequency at which the mobile station device has performed random access A base station apparatus that performs uplink scheduling for transmitting next data in a band.   5. The base station apparatus according to claim 4, wherein the base station apparatus transmits only position information in a time axis direction as scheduling information transmitted to the mobile station apparatus when performing uplink scheduling. Base station apparatus.   A base station apparatus used in a mobile communication system with a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, the base station apparatus being connected to the base station apparatus by the mobile station apparatus A base station apparatus that returns a response signal to the random access in a frequency band corresponding to the frequency band in which random access is performed.   A random access method for allowing a mobile station apparatus to randomly access a base station apparatus in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, wherein the mobile station apparatus The mobile station device makes random access to the base station device from the information that holds the mobile station device and identifies the mobile station device, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device. A random access method for calculating a random access use frequency band for performing, and performing the random access in the calculated random access frequency band.   A random access method for allowing a mobile station apparatus to randomly access a base station apparatus in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, wherein the mobile station apparatus The mobile station device makes random access to the base station device from the information that holds and identifies the mobile station device, the natural frequency bandwidth of the mobile station device, and the natural frequency bandwidth of the base station device. Calculating a random access use frequency band for performing the random access and a random access period for performing the random access, and performing the random access in the calculated random access frequency band and in the calculated random access period, Random access method to do.   A mapping method for mapping a frequency band used by a mobile station apparatus in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class, the mobile station apparatus holding and Uplink / downlink in the base station apparatus and the mobile station apparatus from information enabling identification of the mobile station apparatus, the natural frequency bandwidth of the mobile station apparatus, and the natural frequency bandwidth of the base station apparatus A mapping method characterized by determining a frequency band to be used.   A base station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class is a scheduling method for scheduling an uplink from a mobile station apparatus, the base station apparatus The station apparatus performs scheduling of an uplink for transmitting next data in a frequency band in which the mobile station apparatus performs random access.   The scheduling method according to claim 10, wherein the base station apparatus transmits only position information in a time axis direction as scheduling information to be transmitted to the mobile station apparatus when performing the uplink scheduling. Scheduling method.   A base station apparatus used in a mobile communication system using a mobile station apparatus of a different mobile station class and a base station apparatus of a different base station class is a scheduling method for scheduling an uplink from the mobile station apparatus. When the station apparatus receives random access from the mobile station apparatus and performs scheduling for uplink, the station apparatus has a frequency band corresponding to the frequency band in which the mobile station apparatus performed random access to the base station apparatus, A scheduling method characterized by returning a response signal to the random access.   The program for making a computer implement | achieve the function of the mobile station apparatus of any one of Claims 1 thru | or 3, or the base station apparatus of any one of Claims 4 thru | or 6.   A recording medium in which the program according to claim 13 is recorded so as to be readable by a computer.

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