JP2008311857A - Base station device, mobile station device, program, uplink synchronization requesting method and signal transmitting method for synchronization shift measurement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange an uplink synchronization request to a downlink sharing control signal channel so as to be able to obtain the efficiency of using excellent radio resources. <P>SOLUTION: This base station device comprises a resynchronization factor detecting part for detecting an uplink synchronization factor of a mobile station device, a scheduling part for generating information representing an uplink synchronization request for the mobile station device whose uplink resynchronization factor is detected by the resynchronization factor detecting part, and a transmitting part for making information representing the uplink synchronization request generated by the scheduling part a signal into a signal by a method inherent to the information, arranging the signal in an area on a radio frame on which a parameter to be used for synchronous communication with the mobile station device and transmitting the signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a base station device, a mobile station device, a program, an uplink synchronization request method and a synchronization deviation measurement signal transmission method, in particular, a base station device that performs time synchronization on an uplink from a mobile station device to a base station device, The present invention relates to a mobile station apparatus, a program, an uplink synchronization request method, and a synchronization deviation measurement signal transmission method.

  In the 3rd Generation Partnership Project (3GPP), the W-CDMA system is standardized as a third generation cellular mobile communication system, and services are started sequentially. Also, 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 radio access (Evolved Universal Terrestrial Radio Access; hereinafter referred to as “EUTRA”) is being studied. An OFDM (Orthogonal Frequency Division Multiplexing) system has been proposed as a downlink of EUTRA. In addition, a single carrier communication scheme of DFT (Discrete Fourier Transform) -spread OFDM scheme has been proposed as an uplink of EUTRA.

FIG. 14 is a diagram illustrating the uplink and downlink channel configurations of EUTRA. The downlink of EUTRA includes a downlink pilot channel DPiCH (Downlink Pilot Channel), a downlink synchronization channel DSCH (Downlink Synchronization Channel), a downlink common control channel, a downlink shared control channel PDCCH (Physical Downlink Control Channel) (L1 / L2 (Layer1 / Layer2) control channel), a downlink shared data channel DL-SCH (Downlink-Shared Channel).
Further, the uplink of EUTRA includes an uplink pilot channel UPiCH (Uplink Pilot Channel), a random access channel RACH (Random Access Channel), an uplink shared data channel UL-SCH (Uplink-Shared Channel), and an uplink shared control channel PUCCH. (Physical Uplink Control Channel) (see Non-Patent Document 1).

  FIG. 15 is a diagram illustrating an arrangement example of the random access channel RACH, the uplink shared data channel UL-SCH, and the uplink shared control channel PUCCH on radio resources. In the diagram shown in FIG. 15, the horizontal axis represents time, and the vertical axis represents frequency. FIG. 15 shows the configuration of one radio frame, and this radio frame is divided into a plurality of radio resources. In this example, the radio resources are configured in units of 1.25 MHz in the frequency direction and 1 ms in the time direction, and the random access channel RACH described in FIG. 14 and the uplink shared data channel UL are included in these regions. -SCH is assigned as shown. Thus, the minimum unit of the random access channel RACH uses a band of 1.25 MHz. In FIG. 15, uplink pilot channel UPiCH is distributed and arranged in units of symbols and subcarriers in the region of uplink shared data channel UL-SCH. In addition, since EUTRA provides a plurality of channels for the random access channel RACH, it can cope with a plurality of random accesses at the same time. The largest use purpose of the random access channel RACH is to synchronize between the mobile station apparatus and the base station apparatus. In addition, in the random access channel RACH, it is also considered to shorten the connection time by transmitting several bits of information such as a scheduling request for allocating radio resources (see Non-Patent Document 2).

In the random access channel RACH, only the preamble is transmitted for synchronization. The preamble includes a signature that is a signal pattern representing information. By preparing dozens of types of signatures and selecting and using them, several bits of information can be expressed. Currently, EUTRA transmits 6-bit information by signature. For these 6 bits, 64 signatures of 2 6 are prepared.
Random ID is assigned to 5 bits out of 6 bits by the signature, and any information such as the reason for random access, downlink path loss / CQI (Channel Quality Indicator) is assigned to the remaining 1 bit (Non-patent Document 3) reference).

  FIG. 16 is a sequence diagram showing a sequence example of uplink synchronization using the random access channel RACH. First, the mobile station apparatus selects a signature based on a random ID, a reason for random access, downlink path loss / CQI information, and the like, and transmits a preamble including the signature on the random access channel RACH (message Ma1). When the base station apparatus receives the preamble from the mobile station apparatus, the base station apparatus compares the received preamble with the signal pattern stored in advance as a preamble, thereby calculating a synchronization timing shift between the mobile station apparatus and the base station apparatus. Mobile station apparatus that performs scheduling to transmit L2 / L3 (Layer2 / Layer3) message and requires in-cell mobile station identification information C-RNTI (Cell Radio Network Temporary Identifier) for the reason of random access included in the preamble A C-RNTI is allocated, and a preamble response including synchronization timing deviation information, scheduling information, C-RNTI, and random ID is transmitted (message Ma2). The mobile station apparatus extracts a preamble response from the base station apparatus including the transmitted random ID, and transmits an L2 / L3 message using the scheduled radio resource (message Ma3). The base station apparatus receives the L2 / L3 message from the mobile station apparatus, and transmits a contention resolution for determining whether or not a collision occurs between the mobile station apparatuses to the mobile station apparatus (message Ma4). (See Non-Patent Document 3).

  In random access, when a plurality of mobile station apparatuses select the same signature and random access channel RACH, the random access of these mobile station apparatuses collides. A sequence when random access collides will be described with reference to FIG. When a plurality of mobile station apparatuses select the same signature and transmit a preamble using radio resource blocks having the same time and frequency, that is, the same random access channel RACH, a collision occurs in the message Ma1. If the base station apparatus cannot detect the message Ma1 due to this collision, the base station apparatus cannot return a preamble response (message Ma2). Since the mobile station apparatus cannot receive the preamble response (message Ma2) from the base station apparatus, the mobile station apparatus selects the signature and the random access channel RACH again after a certain period and performs random access. If the base station apparatus can detect the preamble (message Ma1) even if a collision occurs, the base station apparatus calculates the L2 / L3 message scheduling and the synchronization timing shift, and sends a preamble response ( Message Ma2) is returned. However, the preamble response is received by a plurality of mobile station apparatuses, and the plurality of mobile station apparatuses transmit an L2 / L3 message (message Ma3) to the scheduled resource. Occurs. The base station apparatus cannot receive the L2 / L3 message due to the collision and cannot return a response. Since there is no response to the L2 / L3 message, the mobile station device selects a signature again and performs random access.

  A state in which uplink synchronization between the mobile station device and the base station device is out of sync (for example, DRX (Discontinuous In the case of (Reception) state), when downlink data transmission from the base station apparatus is resumed, the mobile station apparatus receives an ACK / NACK (Acknowledgement) that is a reception response for Hybrid Automatic Repeat Request (HARQ). / Negative Acknowledgment) cannot be sent. This is because uplink synchronization is lost, and therefore, if an ACK / NACK of hybrid automatic retransmission HARQ is transmitted, it interferes with other mobile station apparatuses. Therefore, it is necessary to perform uplink synchronization using random access when downlink data transmission is resumed. However, when a collision occurs during this random access, there is a concern that it will take a long time to resume downlink data transmission. In order to avoid this, a proposal has been made to prevent collision in random access when downlink data transmission is resumed by using a signature for resuming downlink data transmission.

FIG. 17 is a diagram illustrating a sequence in which no collision occurs in random access for resuming downlink data transmission.
When the base station apparatus determines to resume downlink data transmission to the mobile station apparatus out of uplink synchronization, the base station apparatus transmits an uplink synchronization request to the mobile station apparatus (message Mb1). This uplink synchronization request is transmitted using an L1 / L2 (Layer1 / Layer2) control channel. The uplink synchronization request includes a signature ID number for random access to be transmitted by the mobile station apparatus. This is called a dedicated signature. The mobile station apparatus performs random access, that is, transmits a preamble (message Mb2) using the dedicated signature received in the uplink synchronization request. The base station apparatus that has received the preamble including the dedicated signature detects a synchronization timing shift based on the preamble. Then, the base station device transmits a TA (Timing Advance) command indicating a shift in synchronization timing as a preamble response to the mobile station device (message Mb3). When the base station apparatus transmits the TA command, the base station apparatus sends an L1 / L2 control channel including downlink resource allocation (message Mb4), and then resumes downlink data transmission (message Mb5) (Non-Patent Document 4). reference).
R1-050850 “Physical Channel and Multiplexing in Evolved UTRA Uplink”, 3GPP TSG RAN WG1 Meeting # 42 London, UK, August 29-September 2, 2005 3GPP TR (Technical Report) 25.814, V7.0.0 (2006-06), Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA) 3GPP TS (Technical Specialization) 36.300, V0.90 (2007-03), Evolved Universal Terrestrial Radio Access (E-UTRA) and evolved Universal ReverSrE R2-062165 “UL Synchronization”, 3GPP TSG RAN WG2 Meeting # 54 Tallinn, 28 August-1 Sept, 2006

  In the downlink data transmission restart method in which collision does not occur in the random access described above, the downlink shared control channel PDCCH (L1 / L2 control channel) that does not require hybrid automatic retransmission HARQ ACK / NACK is used to Send a link synchronization request. The downlink shared control channel PDCCH is a channel that transmits adaptive modulation parameters, channel allocation information, and the like for transmitting and receiving user data between the base station apparatus and the mobile station apparatus. It is a channel that is assigned to and frequently transmitted. As described above, if an area for arranging an uplink synchronization request that is rarely generated is secured in the downlink shared control channel PDCCH that is frequently transmitted, there is a problem that the use efficiency of radio resources is deteriorated.

  The present invention has been made in view of such circumstances, and an object thereof is a base station apparatus that arranges an uplink synchronization request on the downlink shared control channel PDCCH so that excellent use efficiency of radio resources can be obtained. Another object of the present invention is to provide a mobile station apparatus, a program, an uplink synchronization request method, and a synchronization deviation measurement signal transmission method.

  The present invention has been made to solve the above-described problem. The base station apparatus of the present invention includes a resynchronization factor detection unit that detects an uplink resynchronization factor of a mobile station device, and the resynchronization factor detection unit. A scheduling unit that generates information indicating an uplink synchronization request for the mobile station apparatus that has detected an uplink resynchronization factor, and information that represents the uplink synchronization request generated by the scheduling unit are signalized by a method specific to the information. And a transmission unit arranged in an area on a radio frame in which parameters used for synchronous communication with the mobile station apparatus are arranged.

  Further, the base station apparatus of the present invention is the above-described base station apparatus, wherein the information indicating the uplink synchronization request is included in a synchronization deviation measurement signal transmitted by the mobile station apparatus that has received the synchronization request. It includes the instruction information regarding the signal identification information.

  The base station apparatus of the present invention is the above-described base station apparatus, wherein the instruction information related to the measurement signal identification information is information specifying a value of the measurement signal identification information, or the measurement signal identification information It is one of the information for instructing the mobile station apparatus to perform the selection of the value of.

  A base station apparatus according to the present invention is any one of the above-described base station apparatuses, wherein the transmission unit arranges information indicating the uplink synchronization request in a downlink shared control channel for downlink control. And transmitting.

  In addition, the mobile station apparatus of the present invention includes a resynchronization factor detection unit that detects an uplink resynchronization factor with the base station device, and when the occurrence of the uplink resynchronization factor is detected, A receiving unit that extracts information indicating an uplink synchronization request by an information-specific method indicating an uplink synchronization request from an area on a radio frame in which parameters used for synchronous communication with a station apparatus are arranged; and When information indicating the uplink synchronization request is extracted, a measurement signal generation unit that generates a synchronization shift measurement signal and a transmission unit that transmits the synchronization shift measurement signal are provided.

  Further, the mobile station apparatus of the present invention is the above-described mobile station apparatus, and when the receiving unit detects information indicating the uplink synchronization request, the reception unit detects the measurement from the information indicating the uplink synchronization request. Instruction information relating to measurement signal identification information to be included in the measurement signal is acquired.

  Further, the mobile station apparatus of the present invention is the above-described mobile station apparatus, wherein the information specifying the measurement signal identification information includes information specifying a value of the measurement signal identification information, or the measurement signal identification Either of the information for instructing the mobile station apparatus to perform the selection of the value of the information, and the measurement signal generation unit sets the measurement signal identification information of the value according to the information for instructing the measurement signal identification information Including the synchronization deviation measurement signal.

  Further, the mobile station apparatus of the present invention is any one of the above-described mobile station apparatuses, wherein the receiving unit stores information indicating the uplink synchronization request arranged in a downlink shared control channel for downlink control. It is characterized by extracting.

  The mobile station apparatus according to the present invention is any one of the mobile station apparatuses described above, wherein the transmission unit transmits the synchronization deviation measurement signal using a random access channel.

  Further, the program of the present invention provides a computer of a base station device, a resynchronization factor detection unit that detects an uplink resynchronization factor of the mobile station device, and the mobile that the resynchronization factor detection unit detects an uplink resynchronization factor. A scheduling unit that generates information indicating an uplink synchronization request for a station device, and information that represents an uplink synchronization request generated by the scheduling unit is signaled by a method specific to the information and used for synchronous communication with a mobile station device The parameter is arranged in an area on the radio frame where the parameter is arranged, and functions as a transmission unit for transmission.

  Further, the program of the present invention, when the computer of the mobile station apparatus detects the occurrence of the uplink resynchronization factor when the resynchronization factor detection unit for detecting the uplink resynchronization factor with the base station apparatus is detected, Among them, a receiving unit that extracts information representing an uplink synchronization request from an area on a radio frame in which parameters used for synchronous communication with a base station apparatus are arranged, in an information-specific method representing an uplink synchronization request, When the reception unit extracts information indicating the uplink synchronization request, the reception unit functions as a measurement signal generation unit that generates a synchronization shift measurement signal and a transmission unit that transmits the synchronization shift measurement signal.

  The uplink synchronization request method of the present invention is an uplink synchronization request method in a base station apparatus, wherein the base station apparatus detects an uplink resynchronization factor of a mobile station apparatus, and A second step in which the base station device generates information indicating an uplink synchronization request for the mobile station device that has detected an uplink resynchronization factor in the first step; and The information representing the uplink synchronization request generated in the process is signaled by a method specific to the information, arranged in a region on a radio frame in which parameters used for synchronous communication with the mobile station apparatus are arranged, and transmitted. And 3 processes.

  The synchronization deviation measurement signal transmission method of the present invention is a synchronization deviation measurement signal transmission method in a mobile station apparatus, wherein the mobile station apparatus detects an uplink resynchronization factor with a base station apparatus. And when the mobile station apparatus detects the occurrence of the uplink resynchronization factor in the first process, parameters used for synchronous communication with the base station apparatus are arranged in the received signal. A second process of extracting information indicating an uplink synchronization request from an area on a radio frame by an information-specific method indicating an uplink synchronization request; and the mobile station apparatus performs the uplink process in the second process. When information representing a link synchronization request is extracted, the mobile station apparatus includes a third process of generating a synchronization deviation measurement signal and a fourth process of transmitting the synchronization deviation measurement signal by the mobile station apparatus. Features.

  According to the present invention, when uplink signal transmission / reception has not been performed for a certain period, uplink synchronization for the mobile station device is performed in a region on the radio frame in which parameters used for synchronous communication between the base station device and the mobile station device are arranged. Since the information indicating the request is arranged, the uplink synchronization request can be arranged so that excellent use efficiency of radio resources can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. The radio communication system according to the present embodiment includes a base station apparatus and a plurality of mobile station apparatuses, as in the case of evolution EUTRA of third generation radio access. In this embodiment, the communication connection from the mobile station apparatus to the base station apparatus is referred to as “uplink”, and the communication connection from the base station apparatus to the mobile station apparatus is referred to as “downlink”. The downlink in this embodiment is a downlink pilot channel DPiCH, a downlink synchronization channel DSCH, a downlink common control channel, a downlink shared control channel PDCCH (L1 / L2 (Layer1 / Layer2) control channel), a downlink shared data channel. It is comprised by DL-SCH. Further, the uplink in the present embodiment is configured by an uplink pilot channel UPiCH, a random access channel RACH, and an uplink shared data channel UL-SCH.

  The random access channel RACH is an uplink channel having a guard time. For this reason, even if a mobile station apparatus that is not synchronized in time with the base station apparatus for the uplink transmits using the random access channel RACH, the synchronization deviation of the mobile station apparatus is within the guard time range. Then, transmission can be performed without causing interference to other channels. Signatures to be included in the preamble transmitted on the random access channel RACH can be selected from 64 signatures. The mobile station apparatus selects one of these 64 signatures and transmits it by including it in the preamble.

  The downlink shared control channel PDCCH (L1 / L2 control channel) is assigned a fixed area to each radio frame, and the area is divided into downlink control and uplink control. In the downlink control area and the uplink control area, downlink control information and uplink control information for each mobile station apparatus are arranged. From these control information transmitted by the base station apparatus, the mobile station apparatus receives information intended for itself. The control information includes base station apparatus and mobile station apparatus such as resource allocation information (region on radio frame determined by frequency and time) allocation to each mobile station apparatus, adaptive modulation parameters, and hybrid automatic retransmission HARQ. Parameters used for data communication (synchronous communication).

  FIG. 1 is a diagram illustrating a format of information for downlink control for a mobile station apparatus in which uplink synchronization is established. As shown in FIG. 1, the downlink control information includes downlink resource allocation (12 bits: indicates a resource position allocated to the mobile station apparatus for the downlink), MCS (Modulation and Coding Scheme; modulation and code). Information) (3 bits: specify the modulation method and coding method), MIMO (Multiple Input Multiple Output) information (2 bits: specify the number of antennas, etc.), payload size (5 bits: assigned in the downlink) Payload size included in the resource), HARQ information (5 bits), C-RNTI (Cell specific Radio Network Temporary Identity) (16 bits: identifies the mobile station device in the base station device) Mobile station apparatus identification information). This cyclic redundancy check CRC (Cyclic Redundancy Check) of information for downlink control is also used as C-RNTI. That is, when the cyclic redundancy check CRC is calculated for the downlink control information including the area, the value becomes C-RNTI. The mobile station apparatus calculates a cyclic redundancy check CRC for each downlink control information, and based on whether the result is the C-RNTI of the own apparatus, the downlink control information is transmitted to the own apparatus. It is determined whether it is information.

  FIG. 2 is a diagram illustrating a format of information for uplink control for a mobile station apparatus in which uplink synchronization is established. As shown in FIG. 2, uplink control information includes uplink resource allocation (10 bits: indicates a resource position allocated to the mobile station apparatus for uplink), MCS information (3 bits: modulation scheme, encoding) System), payload size (5 bits: size of payload included in resources allocated in downlink), RSF (Reference Signal Format) (2 bits: reference signal transmission format), TPC (Transmission Power Control: (Transmission power control) (4 bits: transmission power) and C-RNTI. This cyclic redundancy check CRC of information for uplink control is also used as C-RNTI. That is, as in the case of the information for downlink control in FIG. 1, the cyclic redundancy check CRC is calculated, and whether or not the result is the information on the own device based on whether or not the result is the C-RNTI of the own device. Determine whether.

  FIG. 3 is a diagram illustrating a format of control information for uplink synchronization request transmitted when uplink resynchronization is necessary, that is, when an uplink resynchronization factor is detected. In the control information for uplink synchronization request, the uplink synchronization request is arranged in the first 14 bits, and the C-RNTI of the mobile station apparatus that is the target of the uplink synchronization request is arranged in the next 16 bits. The control information for uplink synchronization request is information of a different size (30 bits) from the downlink shared control channel for downlink control or the downlink shared control channel for uplink control. Since the timing of the uplink resynchronization factor is managed by the timer in both the mobile station apparatus and the mobile station apparatus, when the uplink resynchronization factor occurs, the format shown in FIG. 3 can be detected.

  When both the base station apparatus and the mobile station apparatus are in the state in which the uplink resynchronization factor is detected, the control information for this uplink synchronization request is transmitted, so the mobile station transmits in the area of the downlink shared control channel. It can be recognized that the received control information is control information for uplink synchronization request. It is assumed that the control information for uplink synchronization request is composed of the same number of bits as the downlink shared control channel for downlink control, for example. The mobile station apparatus performs the same decoding process as that of a normal downlink shared control channel, but decodes an information sequence other than C-RNTI as control information for uplink resynchronization. That is, 7 bits other than 30-bit uplink synchronization request control information and 16-bit C-RNTI are padded with 0 or the like. As another example, the control information for the uplink synchronization request includes, for example, using a subcarrier of a downlink shared control channel for downlink control, reducing the error correction coding rate, changing the modulation scheme, etc. Thus, encoding can be performed by a method unique to the control information. For example, 43 bits of a downlink shared control channel for downlink control are 65 subcarriers when coded with a modulation scheme QPSK (Quadrature Phase Shift Keying) and a coding rate of 1/3. Will be composed. On the other hand, the 30 bits of control information for uplink synchronization request includes modulation scheme BPSK (Binary Phase Shift Keying), coding rate 1/2, modulation scheme QPSK, coding rate. It is encoded with 1/4 and is composed of 65 subcarriers. Alternatively, encoding may be performed with a modulation scheme QPSK and a coding rate of 1/3 using 45 subcarriers.

  Since the timer of the base station apparatus and the timer of the mobile station apparatus are synchronized, the base station apparatus can detect that the timer of the mobile station apparatus has expired when the timer of the base station apparatus has expired. Therefore, if the base station apparatus signals and transmits uplink synchronization request control information in a predetermined area, information sequence, encoding scheme, and modulation scheme, the mobile station apparatus In addition, it is possible to extract a signal using an information sequence, an encoding method, and a modulation method, and to decode control information for uplink synchronization request. This makes it possible to automatically transmit control information for uplink synchronization request without exchanging signals between the base station apparatus and the mobile station apparatus. Furthermore, using a coding method and a modulation method with low transmission efficiency, it is possible to reliably transmit control information for uplink synchronization request, or a signal obtained by encoding and modulating control information for uplink synchronization request It is possible to use a control signal format optimized for the information, such as using a coding method and a modulation method in which the required radio resource size matches the available area, and efficient use of resources Can be realized.

  FIG. 4 shows a detailed example of the format of information for downlink control including an uplink synchronization request for the mobile station apparatus described in FIG. First, in the “type” at the top of this format, an information area indicating the type of signature is arranged in 3 bits. The signature type indicates whether it is a dedicated signature or a random signature. Here, the dedicated signature is a signature used for random access only by the mobile station device designated by the uplink synchronization request from the base station device. In the “signature” next to the “type” area, a 6-bit area for designating a signature ID number when the signature type is a dedicated signature is arranged. In the next “frame number”, when the signature type is a dedicated signature, an area for designating a radio frame area that can use the signature ID number designated in the “signature” area is arranged in 5 bits. When the valid period is defined in the specification in advance, it is not necessary to signal the usable radio frame area. The next “C-RNTI” is an area for designating mobile station apparatus identification information targeted by this downlink control information, as in the case of uplink synchronization, and is a cyclic redundancy check CRC. An area that also serves as 16 bits is arranged. As in the case of the information for downlink control in FIG. 1, the cyclic redundancy check CRC is calculated, and whether or not the result is the information on the own device is determined based on whether or not the result is the C-RNTI of the own device. judge.

  FIG. 4 is a schematic block diagram showing the configuration of the base station apparatus. The base station apparatus includes a data control unit 10, an OFDM modulation unit 11, a scheduling unit 12, a channel estimation unit 13, a DFT-S-OFDM demodulation unit 14, a control data extraction unit 15, a preamble detection unit 16, a signature management unit 17, a radio Unit 19 and upper layer processing unit 30. The scheduling unit 12 includes a DL scheduling unit 20 and a UL scheduling unit 21. The data control unit 10 receives the user data and control data received from the higher layer processing unit 30 according to an instruction from the scheduling unit 12, and transmits the control data to the downlink common control channel, the downlink synchronization channel, the downlink pilot channel, the downlink Mapping is performed on the shared control channel PDCCH, and transmission data for each mobile station apparatus is mapped on the downlink shared data channel DL-SCH. In addition, the data control unit 10 receives uplink control information and downlink control information from the scheduling unit 12 and maps them to the downlink shared control channel PDCCH.

  Further, when the UL scheduling 21 detects an uplink resynchronization factor as will be described later, the data control unit 10 receives control information of information indicating an uplink synchronization request from the scheduling unit 12, and the downlink shared control channel PDCCH. To map. The OFDM modulation unit 11 performs data modulation, serial / parallel conversion, IFFT (Inverse Fast Fourier Transform) conversion, CP (Cyclic Prefix) insertion, filtering, etc. on the data mapped to each channel by the data control unit 10 Signal processing is performed to generate an OFDM signal. At this time, when the UL scheduling 21 detects an uplink resynchronization factor as described later, the OFDM modulation unit 11 uses the downlink shared control channel PDCCH to which the control information of the information indicating the uplink synchronization request is mapped. Then, an OFDM signal is generated by an information sequence specific to information indicating an uplink synchronization request, an error correction coding scheme, and a modulation scheme. The information sequence arrangement method, error correction encoding method, and modulation method specific to the information indicating the uplink synchronization request are predetermined methods, and the information sequence arrangement method, error correction encoding method, Only one of the modulation methods may be used. The radio unit 19 up-converts the OFDM modulated signal generated by the OFDM modulation unit 11 to a radio frequency and transmits the radio frequency to the mobile station apparatus via the antenna. Thus, the OFDM modulation unit 111 and the radio unit 19 function as a transmission unit that transmits user data and control data.

  Also, the radio unit 19 receives an uplink signal from the mobile station apparatus via an antenna, and down-converts the received signal into a baseband signal, the DFT-S-OFDM demodulation unit 14, the channel estimation unit 13, and the preamble detection Pass to part 16. The channel estimation unit 13 estimates the radio channel characteristics from the uplink pilot channel UPiCH in the received signal, and passes this estimation result to the DFT-S-OFDM demodulation unit 14. In addition, the channel estimation unit 13 passes this estimation result to the scheduling unit 12 in order to perform uplink scheduling. The uplink communication scheme is assumed to be a single carrier scheme such as DFT-spread OFDM, but may be a multicarrier scheme such as the OFDM scheme.

  The DFT-S-OFDM demodulator 14 uses the radio channel characteristics received from the channel estimator 13 and the resource allocation information and adaptive modulation parameter information received from the control data extractor 15, etc. The received signal received from is demodulated to obtain received data. The control data extraction unit 15 separates the received data into user data (uplink shared data channel UL-SCH) and control data (uplink shared control channel PUCCH). The control data extraction unit 15 outputs downlink CQI information in the control data to the scheduling unit 12, and passes other control data and user data to the higher layer processing unit 30.

  As described above, the scheduling unit 12 includes the DL scheduling unit 20 that performs downlink scheduling and the UL scheduling unit 21 that performs uplink scheduling. The DL scheduling unit 20 performs scheduling for mapping user data to each downlink channel from CQI information notified from the mobile station apparatus and scheduling information of each user data notified from the higher layer processing unit 30. The DL scheduling unit 20 generates downlink control information for the synchronized mobile station apparatus shown in FIG. 1 based on the scheduling result, and outputs the information to the data control unit 10. The UL scheduling unit 21 performs scheduling for mapping user data to each uplink channel from the uplink radio channel estimation result from the channel estimation unit 13 and the resource allocation request from the mobile station apparatus. The UL scheduling unit 21 generates uplink control information for the synchronized mobile station apparatus shown in FIG. 2 based on the scheduling result, and outputs the information to the data control unit 10.

  The UL scheduling unit (resynchronization factor detection unit) 21 manages the uplink synchronization status of each mobile station apparatus using a timer, and there has been no uplink transmission / reception for a certain period of time, or the uplink synchronization information is updated. The mobile station apparatus functions as a resynchronization factor detection unit that detects the occurrence of uplink resynchronization factors when there is no remaining state. The scheduling unit 12 notifies the upper layer processing unit 30 of the uplink resynchronization factor for the mobile station device that needs the uplink resynchronization detected by the timer, and also transmits the uplink synchronization request of each of these mobile station devices. The included downlink control information is generated and output to the data control unit 10. When the scheduling unit 12 generates downlink control information including an uplink synchronization request, the scheduling unit 12 acquires a signature ID number of a dedicated signature that can be used from the signature management unit 17 and stores the signature ID number in the downlink control information. At the same time, information for identifying the mobile station apparatus using the signature ID number and the radio frame area to be used are registered in the signature management unit 17.

  The preamble detection unit 16 detects a preamble, which is a synchronization deviation measurement signal, from the received signal received from the radio unit 19, and further calculates a synchronization timing deviation amount. The preamble detection unit 16 reports the signature ID number (measurement signal identification information) acquired from the detected preamble and the calculated synchronization timing shift amount to the upper layer processing unit 30. The preamble detection unit 16 sets the dedicated signature flag to 1 when the acquired signature ID number is a signature notified from the signature management unit 17, and sets the dedicated signature flag when it is not notified from the signature management unit Set the flag to 0. Further, when the acquired signature ID number is a signature notified from the signature management unit 17, the preamble detection unit 16 reports that the preamble of the signature ID number notified to the signature management unit 17 has been detected.

  The signature management unit 17 selects a dedicated signature according to an instruction from the UL scheduling unit 21 and notifies the UL scheduling unit 21 of the ID number of the selected dedicated signature. In addition, the selected signature is notified to the preamble detector 16. When selecting the dedicated signature, the signature management unit 17 confirms the signature ID number of the dedicated signature being used, and selects from the exclusive signatures being used. The signature management unit 17 registers the selected signature ID number as in use, and deletes the signature detected by the preamble detection unit 16 from the stored content. The upper layer processing unit 30 controls the base station apparatus so as to perform the procedure described with reference to FIGS.

FIG. 6 is a schematic block diagram showing the configuration of the mobile station apparatus. The mobile station apparatus includes a data control unit 50, a DFT-S-OFDM modulation unit 51, a scheduling unit 52, an OFDM demodulation unit 53, a channel estimation unit 54, a control data extraction unit 55, a synchronization correction unit 56, a preamble generation unit 57, a signature. A selection unit 58, a radio unit 59, and an upper layer processing unit 60 are provided.
User data and control data are input to the data control unit 50 and mapped to the uplink shared data channel UL-SCH according to an instruction from the scheduling unit 52. The DFT-S-OFDM modulation unit 51 performs DFT-S-OFDM signal processing such as data modulation, DFT conversion, subcarrier mapping, IFFT conversion, CP (Cyclic Prefix) insertion, and filtering on the data mapped by the data control unit 50. And generate a DFT-Spread-OFDM signal. As an uplink communication scheme, a single carrier scheme such as DFT-spread OFDM is assumed, but a multicarrier scheme such as an OFDM scheme may be used. The synchronization correction unit 56 determines the transmission timing from the synchronization information passed from the control data extraction unit 55, and wirelessly matches the DFT-Spread-OFDM signal received from the DFT-S-OFDM modulation unit 51 with the transmission timing. To part 59. The radio unit 59 sets the radio frequency instructed by the radio control unit, up-converts the DFT-Spread-OFDM signal received from the synchronization correction unit 56 to the radio frequency, and transmits the radio frequency to the base station apparatus via the antenna. As described above, the data control unit 50 and the DFT-S-OFDM modulation unit 51 function as a transmission unit that transmits user data and control data.

  Also, the radio unit 59 receives a downlink signal from the base station apparatus via an antenna, down-converts it to a baseband signal, and transmits the baseband signal to the OFDM demodulator 53 and the channel estimator 54. hand over. The channel estimation unit 54 estimates the radio channel characteristics from the downlink pilot channel in the signal received from the radio unit 59 and passes the estimation result to the OFDM demodulation unit 53 and the scheduling unit 52. In addition, the channel estimation unit 54 converts the channel quality indicator (CQI) information into the base station apparatus so as to notify the estimation result of the radio channel characteristics, and passes the CQI information to the data control unit 50. The OFDM demodulator 53 demodulates the baseband signal received from the radio unit 59 using the radio channel estimation result of the channel estimator 54 by the error correction encoding method and the modulation method instructed from the control data extraction unit 55, Get received data. The control data extraction unit 55 separates the received data into user data and control data.

  The control data extraction unit 55 extracts the uplink control information for the own device from the separated control data, passes this information to the scheduling unit 52, and further extracts the uplink synchronization information for the own device. This information is passed to the synchronization correction unit 56. In addition, the control data extraction unit 55 extracts downlink control information for the own device from the separated control data, and this information is information for downlink control for the mobile station device in which uplink synchronization is established. In this case, the OFDM demodulator 53 is configured to demodulate the user data and control data of the resource indicated by the resource allocation of the information from the baseband signal by the modulation scheme indicated by the adaptive modulation parameter of the information. Instruct. On the other hand, when the extracted downlink control information for the own apparatus is control information for uplink synchronization request, the information is sent to the upper layer processing unit in order to transmit a synchronization deviation measurement signal according to the information. Pass to 60. Further, other control data and user data are also passed to the upper layer processing unit 60. As described above, the OFDM demodulating unit 53 and the control data extracting unit 55 function as a receiving unit that receives control data and user data.

  When the scheduling unit 52 detects the occurrence of an uplink resynchronization factor, the control data extraction unit 55 demodulates the downlink shared control channel for downlink control to the OFDM demodulation unit 53 and demodulates the information for downlink control. Is determined to be information for downlink control including an uplink synchronization request, and C-RNTI is detected. Information indicating the uplink synchronization request is extracted using a predetermined unique information sequence arrangement method, error correction coding method, or modulation method. In addition, when the scheduling unit 52 has not detected the occurrence of an uplink resynchronization factor, the control data extraction unit 55 uses the extracted downlink control information as the downlink for the mobile station apparatus in which uplink synchronization is established. It is determined that the information is for link control, and C-RNTI is detected.

  The signature selection unit 58 selects a signature ID number to be used for random access according to an instruction from the higher layer processing unit 60, and passes the selected signature ID number to the preamble generation unit 57. The preamble generation unit (measurement signal generation unit) 57 generates a preamble (synchronization shift measurement signal) with the signature ID number selected by the signature selection unit 58 and passes the preamble to the DFT-S-OFDM modulation unit 51. The scheduling unit 52 performs MAC control and controls transmission / reception of data using resources instructed by the base station apparatus. Also, the scheduling unit (resynchronization factor detection unit) 52 manages the uplink synchronization status of each mobile station apparatus using a timer, and when there is no uplink transmission / reception for a certain period of time, or the uplink synchronization information It functions as a resynchronization factor detection unit that detects that an uplink resynchronization factor has occurred when a state in which there is no update continues. The upper layer processing unit 60 controls the mobile station apparatus so as to perform the procedures described later with reference to FIGS.

  In the present embodiment, when an uplink synchronization request is made to a mobile station apparatus in a state where uplink resynchronization is necessary, the base station apparatus transmits an uplink synchronization request using the downlink shared control channel PDCCH. When a dedicated signature is included in the uplink synchronization request, the mobile station device transmits a collision-free random access RACH using the dedicated signature. This will be specifically described below. FIG. 7 shows a procedure when the base station apparatus transmits an uplink synchronization request including a dedicated signature, and FIG. 8 shows a procedure when the base station apparatus transmits an uplink synchronization request specifying a random signature. FIG. 9 shows a procedure when the mobile station apparatus cannot receive the downlink shared control channel PDCCH including the uplink synchronization request.

  FIG. 7 is a sequence diagram illustrating a procedure when the base station apparatus transmits an uplink synchronization request including a dedicated signature. The base station apparatus manages uplink synchronization of the mobile station apparatus. The UL scheduling unit 21 of the base station apparatus sets a timer, and when a state in which no uplink transmission is continued for a certain period of time or a state in which no uplink synchronization information is updated continues, the uplink scheduling unit 21 It is determined that a synchronization factor has occurred. The base station apparatus detects arrival of data (transmission data and reception data) to a mobile station apparatus that requires uplink resynchronization, that is, a mobile station apparatus that has been determined to have caused an uplink resynchronization factor, or the base station apparatus When it is determined that the uplink synchronization is to be continued for the mobile station apparatus determined to have caused an uplink resynchronization factor, an uplink synchronization request is transmitted. The UL scheduling unit 21 generates information for downlink control including an uplink synchronization request, and the data control unit 10 maps the information to the downlink shared control channel PDCCH and transmits the signal (signal 7-1). ). This uplink synchronization request has the format shown in FIG. This uplink synchronization request includes a signature ID number that is information for designating a dedicated signature acquired by the UL scheduling unit 21 from the signature management unit 17. Further, the signature management unit 17 stores the signature ID number and the C-RNTI of the transmission destination mobile station apparatus in association with each other.

  When the scheduling unit 52 detects the occurrence of an uplink resynchronization factor, the control data extraction unit 55 of the mobile station apparatus transmits the information on each downlink control information of the downlink shared control channel PDCCH. The cyclic redundancy check CRC is calculated as a 30-bit area including the synchronization request. The control data extraction unit 55 found the downlink control information whose calculation result of the cyclic redundancy check CRC matches the C-RNTI of the own device, and was able to accurately receive the downlink control information for the own device. Detect that. Upon receiving the uplink synchronization request included in the information for downlink control, the upper layer processing unit 60 uses the signature ID number and the frame number specified in the uplink synchronization request as the signature selection unit 58. Is specified. The signature selection unit 58 selects a dedicated signature having the designated signature ID number, and designates the dedicated signature and the designated frame number to the preamble generation unit 57. The preamble generation unit 57 generates a preamble of the designated dedicated signature, and the DFT-S-OFDM modulation unit 51 transmits this preamble using the random access channel RACH in the radio frame having the designated frame number. (Signal 7-2: Message 1).

  When the preamble detection unit 16 of the base station apparatus detects the preamble on the random access channel, the higher layer processing unit 30 generates and transmits a preamble response to the preamble (signal 7-3: message 2). At this time, the higher layer processing unit 30 of the base station device can identify the mobile station device that is the transmission source of the detected preamble by comparing the dedicated signature detected from the preamble and the registered content of the signature management unit 17. Is possible. The upper layer processing unit 30 acquires C-RNTI, which is identification information of the identified mobile station device, from the signature management unit 17. The data control unit 10 maps the preamble response separately for the downlink shared control channel PDCCH and the downlink shared data channel DL-SCH. The information to be mapped to the downlink shared control channel PDCCH is RA-RNTI (Random Access-Radio Network Temporary Identity) that identifies a preamble response, or intra-cell mobile station identification information C that directly designates a mobile station apparatus. -RNTI is included, and the downlink shared data channel DL-SCH includes synchronization information that indicates a correction amount of synchronization loss.

  When RA-RNTI is used, a dedicated signature or C-RNTI is included in the downlink shared data channel DL-SCH. In the mobile station device, the control data extraction unit 55 detects a dedicated signature or C-RNTI, thereby detecting a preamble response to the own device. The control data extraction unit 55 extracts the synchronization information from the preamble response, and instructs the synchronization correction unit 56 about the amount of synchronization deviation correction according to the instruction of the synchronization information. Subsequently, normal data transmission is resumed from the base station apparatus (signal 7-4, signal 7-5).

  FIG. 8 is a sequence diagram illustrating a procedure when the base station apparatus does not transmit a dedicated signature. The base station apparatus manages uplink synchronization of the mobile station apparatus. The UL scheduling unit 21 of the base station apparatus sets a timer, and when a state in which no uplink transmission / reception continues for a certain period of time or when a state in which uplink synchronization information is not updated continues, the uplink scheduling unit 21 Specify that a synchronization factor has occurred. The base station apparatus detects arrival of data (transmission data and reception data) to a mobile station apparatus that requires uplink synchronization resynchronization, that is, a mobile station apparatus in which an uplink resynchronization factor has occurred, or the base station apparatus When it is determined that uplink synchronization is to be continued for the mobile station apparatus in which an uplink resynchronization factor has occurred, an uplink synchronization request is transmitted. The UL scheduling unit 21 generates downlink control information including an uplink synchronization request, and the data control unit 10 maps the information to the downlink shared control channel PDCCH and transmits the signal (signal 8-1). ). Here, in the uplink synchronization request, a random signature is specified in the “type” area, which indicates that a dedicated signature cannot be assigned.

  When the scheduling unit 52 detects the occurrence of an uplink resynchronization factor, the control data extraction unit 55 of the mobile station apparatus transmits the information on each downlink control information of the downlink shared control channel PDCCH. The cyclic redundancy check CRC is calculated as a 30-bit area including the synchronization request. The control data extraction unit 55 found the downlink control information whose calculation result of the cyclic redundancy check CRC matches the C-RNTI of the own device, and was able to accurately receive the downlink control information for the own device. Detect that. Upon receiving this uplink synchronization request, the upper layer processing unit 60 instructs the signature selection unit 58 to select a signature. The signature selection unit 58 randomly selects a signature with a signature ID number other than the dedicated signature, and instructs the preamble generation unit 57 to generate a preamble including the signature. The preamble generation unit 57 generates a preamble of the instructed signature, and the DFT-S-OFDM modulation unit 51 transmits this preamble using the random access channel RACH (signal 8-2: message 1).

  When the preamble detection unit 16 of the base station apparatus detects the preamble on the random access channel, the higher layer processing unit 30 generates and transmits a preamble response to the preamble (signal 8-3: message 2). At this time, the upper layer processing unit 30 of the base station apparatus cannot identify the mobile station apparatus by detecting the signature. The data control unit 10 maps the preamble response separately for the downlink shared control channel PDCCH and the downlink shared data channel DL-SCH. The downlink shared control channel PDCCH includes RA-RNTI that identifies a preamble response, and the downlink shared data channel DL-SCH includes synchronization information and signature mapping information, signature and new cell Mapping information of mobile station apparatus identification information C-RNTI (TC-RNTI) and scheduling information of message 3 for transmitting message 3 which is a response of the mobile station apparatus to message 2 are included.

  At this point, the base station apparatus cannot grasp why the mobile station apparatus has performed random access. The mobile station apparatus transmits message 3 according to the scheduling information of message 3 (signal 8-4: message 3). The message 3 includes in-cell mobile station apparatus identification information C-RNTI for identifying the source mobile station apparatus. When the base station apparatus receives the message 3 including the C-RNTI, the message 3 is transmitted according to the previously transmitted scheduling information, so that the response from the mobile station apparatus instructed by the signal 8-1 Detect something. The base station apparatus transmits contention resolution as collision resolution information when a plurality of mobile station apparatuses are simultaneously transmitting using the same signature in the preamble of message 1 corresponding to message 3 (signal 8). -5: Message 4). The downlink shared control channel PDCCH in which the message 4 is arranged includes new intra-cell mobile station device identification information TC-RNTI specified by the base station device in the message 2, and the downlink shared data channel DL-SCH. Includes mobile station apparatus identification information detected by the base station apparatus in message 3. Subsequently, normal data transmission is resumed from the base station apparatus. (Signal 8-6, Signal 8-7)

  FIG. 9 is a sequence diagram illustrating a procedure when the mobile station apparatus fails the cyclic redundancy check CRC check of the downlink shared control channel PDCCH. The base station apparatus manages uplink synchronization of the mobile station apparatus. The UL scheduling unit 21 of the base station apparatus sets a timer, and when a state in which no uplink transmission / reception continues for a certain period of time or when a state in which uplink synchronization information is not updated continues, the uplink scheduling unit 21 Specify that a synchronization factor has occurred. The base station apparatus detects arrival of data (transmission data and reception data) to a mobile station apparatus that requires uplink synchronization resynchronization, that is, a mobile station apparatus in which an uplink resynchronization factor has occurred, or the base station apparatus When it is determined that uplink synchronization is to be continued for the mobile station apparatus in which an uplink resynchronization factor has occurred, an uplink synchronization request is transmitted. The uplink synchronization request is transmitted on the downlink shared control channel PDCCH (signal 9-1).

  The control data extraction unit 55 of the mobile station device calculates a cyclic redundancy check CRC for each downlink control information of the downlink shared control channel PDCCH, and searches for a match with its own C-RNTI. Then, it is assumed that the mobile station apparatus is not able to receive accurately and does not match because the reception status of the mobile station apparatus is poor. Since the mobile station apparatus cannot detect the uplink synchronization request, the mobile station apparatus stops reception until the next reception cycle, and performs the downlink shared control channel PDCCH reception operation again. When the base station apparatus cannot obtain a response from the mobile station apparatus within a predetermined window time (the response method varies depending on the situation of FIGS. 6 to 7 above), the mobile station apparatus makes an uplink synchronization request. Detects that it was not received. When the base station apparatus detects non-reception of the mobile station apparatus, the base station apparatus waits until the next transmission cycle, and performs an uplink synchronization request procedure for the mobile station apparatus that needs uplink resynchronization again (signal 9-2).

  FIG. 10 is a sequence diagram illustrating another procedure when the mobile station apparatus fails the cyclic redundancy check CRC check of the downlink shared control channel PDCCH. The base station apparatus manages uplink synchronization of the mobile station apparatus. For example, a timer is set, and when there is no uplink transmission for a certain period of time, or when there is no uplink synchronization information update, the occurrence of an uplink resynchronization factor is identified. The base station apparatus detects the arrival of data to the mobile station apparatus that requires uplink resynchronization, or the base station apparatus continues uplink synchronization for the mobile station apparatus that requires uplink resynchronization. When the determination is made, an uplink synchronization request is transmitted. The uplink synchronization request is transmitted on the downlink shared control channel PDCCH (signal 10-1).

  The control data extraction unit 55 of the mobile station device calculates a cyclic redundancy check CRC for each downlink control information of the downlink shared control channel PDCCH, and searches for a match with its own C-RNTI. Then, it is assumed that the mobile station apparatus is not able to receive accurately and does not match because the reception status of the mobile station apparatus is poor. Since the mobile station apparatus cannot detect the uplink synchronization request, it transmits the next uplink (signal 10-2). Here, uplink transmission is not dynamic uplink transmission specified by the downlink shared control channel PDCCH, but uplink transmission shared with a transmission method, transmission resources, and the like set in advance by Layer 3 level RRC signaling and the like. Data transmission transmitted on the data channel and transmission such as a CQI feedback channel transmitted on the uplink shared control channel. When the base station apparatus detects the uplink transmission, the mobile station apparatus detects that the uplink synchronization request has not been received. When the base station apparatus detects non-reception of the mobile station apparatus, the base station apparatus performs an uplink synchronization request procedure for the mobile station apparatus that needs uplink resynchronization again (signal 9-3). However, since the detection of uplink transmission is transmission from a mobile station that is not in uplink synchronization, whether it can be detected accurately depends on the transmission timing of the mobile station and the radio conditions. Therefore, this sequence functions as an auxiliary role of the sequence described in FIG.

  FIG. 11 is a flowchart showing a processing procedure of uplink synchronization request transmission processing of the base station apparatus. The base station apparatus confirms uplink synchronization of the destination mobile station apparatus during data transmission. At this time, when the UL scheduling unit 21 does not detect the uplink resynchronization factor for the mobile station apparatus (Sa1-No), normal data transmission is performed. On the other hand, when the UL scheduling unit 21 has detected the uplink resynchronization factor for the mobile station apparatus, that is, when uplink synchronization is lost (Sa1-Yes), it determines to transmit the uplink synchronization request. Next, the UL scheduling unit 21 refers to the signature management unit 17 to check whether a dedicated signature can be assigned. When a dedicated signature can be assigned (Sa2-Yes), a dedicated signature is selected (Sa3). Next, the UL scheduling unit 21 registers a dedicated signature in the “type” area in step Sa3 and includes an uplink synchronization request in which the signature ID number of the selected dedicated signature is registered in the “signature” area. Information for control is generated, and this information is mapped to the downlink shared control channel PDCCH by the data control unit 10 and transmitted (Sa4).

  On the other hand, when it is impossible to assign a dedicated signature in step Sa2 (Sa2-No), the UL scheduling unit 21 uses the uplink synchronization request including the uplink synchronization request in which the random signature is registered in the “type” area. The data control unit 10 maps this information to the downlink shared control channel PDCCH and transmits it (Sa6). When the downlink control information including the uplink synchronization request is transmitted in step Sa4 or step Sa6, the upper layer processing unit 30 is within a predetermined window time, that is, in the “frame number” of the uplink synchronization request. In the designated radio frame, the preamble detection unit 16 determines whether or not a preamble that is a response to the uplink synchronization request has been received. If not (Sa5-No), the process returns to step Sa2 and again returns to the uplink. Perform the link synchronization request procedure. On the other hand, if it is determined in step Sa5 that a response preamble has been received (Sa5-Yes), the uplink synchronization request transmission process is terminated.

  FIG. 12 is a flowchart illustrating a processing procedure of a random access reception processing procedure of the base station apparatus. When the preamble detection unit 16 of the base station apparatus detects the preamble in the random access channel, the preamble detection unit 16 refers to the signature management unit 17 to determine whether the preamble signature is a dedicated signature (Sb1). If it is determined in step Sb1 that the signature is a dedicated signature, the preamble detection unit 16 notifies the higher layer processing unit 30 of the synchronization shift measured when the preamble is detected. The upper layer processing unit 30 that has received this synchronization shift outputs a preamble response including the synchronization shift synchronization information to the data control unit 10 and transmits it (Sb2), and ends the random access reception process. On the other hand, if it is determined in step Sb1 that the signature is not a dedicated signature, the upper layer processing unit 30 outputs a preamble response including the synchronization information and the scheduling information of the message 3 in FIG. 8 to the data control unit 10 and transmits it (Sb3 ), The message 3 reception process starts. Upon receiving the message 3 (Sb4), the upper layer processing unit 30 that has received the message 3 checks whether or not the C-RNTI of the mobile station apparatus of the uplink synchronization request is included in the message 3 (Sb5). When C-RNTI and other IDs of other mobile station devices are detected, another factor random access processing is performed (Sb5-No). When detecting the C-RNTI of the mobile station apparatus of the uplink synchronization request (Sb5-Yes), the upper layer processing unit 30 generates the message 4 of FIG. 8 and outputs it to the data control unit 10 for transmission ( Sb6), the random access reception process is terminated.

  FIG. 13 is a flowchart showing a processing procedure for monitoring the uplink shared control channel PDCCH of the mobile station apparatus. The control data extraction unit 55 of the mobile station apparatus periodically monitors the downlink shared control channel PDCCH. When monitoring, if the scheduling unit 52 does not detect the occurrence of an uplink resynchronization factor (Sc1-No), a normal downlink shared control channel reception process is performed. On the other hand, when the monitoring unit 52 detects the occurrence of an uplink resynchronization factor when monitoring (Sc1-Yes), the control data extraction unit 55 includes the downlink shared control channel PDCCH including the uplink synchronization request. The received C-RNTI is received as information for downlink control. If the C-RNTI of the own apparatus cannot be detected in this search (Sc2-No), the monitoring process is terminated because the downlink control information including the uplink synchronization request has not been received. On the other hand, when the C-RNTI of the own device is detected by detecting the C-RNTI of the own device, that is, when an uplink synchronization request is detected (Sc2-Yes), the uplink synchronization request is received from the control data extracting unit 55 The upper layer processing unit 60 obtains information indicating the signature type from the region of the uplink synchronization request type, determines whether or not it includes a dedicated signature (Sc3), and stops uplink transmission.

  If it is determined in step Sc3 that the dedicated signature is included (Sc3-Yes), the higher layer processing unit 60 instructs the preamble generation unit 57 to transmit the preamble of the dedicated signature via the signature selection unit 58. . The preamble generation unit 57 generates a preamble of the designated dedicated signature, and outputs the preamble to the DFT-S-OFDM modulation unit 51 for transmission (Sc4). When the mobile station apparatus transmits the preamble with the dedicated signature, the mobile station apparatus receives the message 2 of FIG. 7 which is a response to the preamble (Sc5). After the control data extraction unit 55 acquires the synchronization information from the message 2 and sets the synchronization information in the synchronization correction unit 56, the mobile station device continues data transmission / reception.

  On the other hand, when it is determined in step Sc3 that the dedicated signature is not included (Sc3-No), the upper layer processing unit 60 instructs the signature selecting unit 58 to select a signature at random. Upon receiving this instruction, the signature selection unit 58 randomly selects a signature and outputs the signature ID number of the selected signature to the preamble generation unit 57. The preamble generation unit 57 generates a preamble of the signature having the signature ID number, and outputs the preamble to the DFT-S-OFDM modulation unit 51 for transmission (Sc6). When the mobile station apparatus transmits a preamble with a randomly selected signature, the mobile station apparatus receives message 2 in FIG. 8 which is a response to the preamble (Sc7). The mobile station apparatus obtains synchronization information and signature mapping information, signature and new C-RNTI (TC-RNTI) mapping information, and message 3 scheduling information from this message 2. The mobile station apparatus transmits message 3 including its own C-RNTI according to the acquired scheduling information (Sc8). After receiving the message 4 (Sc9), the mobile station device continues data transmission / reception.

  As described above, in this embodiment, the base station apparatus and the mobile station apparatus detect the uplink resynchronization factor using the timer, and the uplink time is synchronized between the base station apparatus and the mobile station apparatus. When an uplink resynchronization factor is detected in the downlink control information area of the downlink shared control channel PDCCH used for transmission of communication parameters when By arranging this, it is possible to obtain excellent use efficiency of radio resources. This utilizes the fact that, when an uplink synchronization request is transmitted, uplink resynchronization is always required, so that it is not necessary to transmit communication parameters when uplink synchronization is established.

  In the present embodiment, the preamble detection unit 16 selects the largest amount of synchronization timing deviation when it can be confirmed that the preamble collides with another mobile station device at the time of preamble detection. As described above, a plurality of deviation amounts may be calculated and reported to the upper layer. In this case, the mobile station apparatus notified of a plurality of synchronization timing shifts sets the transmission timing of the message 3 in FIG. 8 from the largest amount, and if the message 4 is not returned, Transmit at a transmission timing with a large deviation amount

In this embodiment, the uplink synchronization request is arranged in the information area for downlink control as shown in FIG. 3, but may be arranged in the information area for uplink control.
Further, the uplink synchronization request may be arranged in either the downlink control information area or the uplink control information area.

  5, the upper layer processing unit 30, the data control unit 10, the OFDM modulation unit 11, the scheduling unit 12, the channel estimation unit 13, the DFT-S-OFDM demodulation unit 14, the control data extraction unit 15, the preamble detection unit 16, Signature management unit 17, or upper layer processing unit 60, data control unit 50, DFT-S-OFDM modulation unit 51, scheduling unit 52, OFDM demodulation unit 53, channel estimation unit 54, control data extraction unit 55 in FIG. A program for realizing the functions of the synchronization correction unit 56, preamble generation unit 57, and signature selection unit 58 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. By doing so, you may process each part. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.

  The present invention is suitable for use in a mobile phone system having a mobile phone terminal as a mobile station device, but is not limited to this.

It is a figure which shows the format of the information for the downlink control with respect to the mobile station apparatus with which the uplink synchronization was taken by one Embodiment of this invention. 4 is a diagram illustrating a format of information for uplink control for a mobile station apparatus in which uplink synchronization is achieved in the embodiment. FIG. It is a figure which shows the format of the information for downlink control containing the uplink synchronization request | requirement in the embodiment. It is a figure which shows the detailed example of the format of the information for downlink control containing the uplink synchronous request | requirement in the embodiment. It is a schematic block diagram which shows the structure of the base station apparatus in the same embodiment. It is a schematic block diagram which shows the structure of the mobile station apparatus in the embodiment. It is a sequence diagram explaining a procedure when the base station apparatus transmits an uplink synchronization request including a dedicated signature. It is a sequence diagram explaining the procedure in case the base station apparatus in the same embodiment does not transmit a dedicated signature. It is a sequence diagram explaining the procedure in case the mobile station apparatus in the embodiment fails the cyclic redundancy check CRC check of the downlink shared control channel. It is a sequence diagram explaining another procedure when the mobile station apparatus in the embodiment fails in the cyclic redundancy check CRC check of the downlink shared control channel. 7 is a flowchart showing a processing procedure of uplink synchronization request transmission processing of the base station apparatus in the embodiment. It is a flowchart which shows the process sequence of the random access reception process sequence of the base station apparatus in the embodiment. 4 is a flowchart showing a processing procedure of monitoring processing of an uplink shared control channel PDCCH of the mobile station device in the embodiment. It is a figure which shows the channel structure of the uplink and downlink in the conventional EUTRA. It is the figure which showed the example of arrangement | positioning on the radio | wireless resource of the random access channel RACH and the uplink scheduling channel USCH in conventional EUTRA. It is a sequence diagram which shows the example of a sequence of the uplink synchronization using the random access channel RACH in the conventional EUTRA. It is a figure which shows the sequence which was made not to generate | occur | produce a collision in the random access of the data transmission restart of downlink in the conventional EUTRA.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Data control part 11 ... OFDM modulation part 12 ... Scheduling part 13 ... Channel estimation part 14 ... DFT-S-OFDM modulation part 15 ... Control data extraction part 16 ... Preamble detection part 17 ... Signature management part 19 ... Radio | wireless part 20 ... DL scheduling unit 21 ... UL scheduling unit 30 ... upper layer processing unit 50 ... data control unit 51 ... DFT-S-OFDM modulation unit 52 ... scheduling unit 53 ... OFDM demodulation unit 54 ... channel estimation unit 55 ... control data extraction unit 56 ... Synchronization correction unit 57 ... Preamble generation unit 58 ... Signature selection unit 59 ... Radio unit 60 ... Upper layer processing unit

Claims (13)

A resynchronization factor detector for detecting an uplink resynchronization factor of the mobile station device;
A scheduling unit for generating information indicating an uplink synchronization request for the mobile station apparatus in which the resynchronization factor detection unit has detected an uplink resynchronization factor;
Information indicating the uplink synchronization request generated by the scheduling unit is signalized by a method specific to the information, and is transmitted in a region on a radio frame in which parameters used for synchronous communication with the mobile station apparatus are allocated and transmitted. The base station apparatus characterized by comprising.   The information indicating the uplink synchronization request includes instruction information regarding measurement signal identification information included in a synchronization shift measurement signal transmitted by the mobile station apparatus that has received the synchronization request. Base station equipment. The instruction information related to the measurement signal identification information is either information specifying a value of the measurement signal identification information or information instructing the mobile station apparatus to select a value of the measurement signal identification information. The base station apparatus according to claim 2.   The said transmission part arrange | positions and transmits the information showing the said uplink synchronous request | requirement to the downlink shared control channel for downlink control, The transmission method of any one of Claim 1 to 3 characterized by the above-mentioned. Base station equipment. A resynchronization factor detector for detecting an uplink resynchronization factor with the base station device;
When the occurrence of the uplink resynchronization factor is detected, an information-specific method representing an uplink synchronization request from an area on a radio frame in which parameters used for synchronous communication with the base station apparatus are arranged in the received signal A receiver for extracting information representing an uplink synchronization request in
When the reception unit has extracted information representing the uplink synchronization request, a measurement signal generation unit that generates a synchronization shift measurement signal;
A mobile station apparatus comprising: a transmission unit that transmits the synchronization deviation measurement signal.   The receiving unit, when detecting information indicating the uplink synchronization request, obtains instruction information related to measurement signal identification information included in the measurement signal from information indicating the uplink synchronization request. The mobile station apparatus according to claim 5. The information for instructing the measurement signal identification information is either information for specifying the value of the measurement signal identification information or information for instructing the mobile station apparatus to select the value of the measurement signal identification information. Yes,
The measurement signal generation unit generates the synchronization deviation measurement signal including measurement signal identification information having a value according to information indicating the measurement signal identification information. Mobile station device.   The said receiving part extracts the information showing the said uplink synchronization request | requirement arrange | positioned at the downlink shared control channel for downlink control, The description in any one of Claim 5-7 characterized by the above-mentioned. Mobile station device.   The mobile station apparatus according to claim 5, wherein the transmission unit transmits the synchronization error measurement signal using a random access channel. The base station computer,
A resynchronization factor detector for detecting an uplink resynchronization factor of the mobile station device;
A scheduling unit that generates information representing an uplink synchronization request for the mobile station apparatus in which the resynchronization factor detection unit has detected an uplink resynchronization factor;
Information indicating the uplink synchronization request generated by the scheduling unit is signalized by a method specific to the information, and is transmitted in a region on a radio frame in which parameters used for synchronous communication with the mobile station apparatus are allocated and transmitted. A program that functions as a part. The mobile station computer
A resynchronization factor detector for detecting an uplink resynchronization factor with the base station device;
When the occurrence of the uplink resynchronization factor is detected, an information-specific method representing an uplink synchronization request from an area on a radio frame in which parameters used for synchronous communication with the base station apparatus are arranged in the received signal A receiver for extracting information representing an uplink synchronization request in
When the receiving unit extracts information indicating the uplink synchronization request, a measurement signal generation unit that generates a synchronization shift measurement signal;
A program that functions as a transmission unit that transmits the synchronization deviation measurement signal. An uplink synchronization request method in a base station device,
A first step in which the base station apparatus detects an uplink resynchronization factor of the mobile station apparatus;
A second process in which the base station apparatus generates information indicating an uplink synchronization request for the mobile station apparatus that has detected an uplink resynchronization factor in the first process;
On the radio frame in which information indicating the uplink synchronization request generated in the second process by the base station apparatus is signaled by a method specific to the information and parameters used for synchronous communication with the mobile station apparatus are arranged. And an uplink synchronization request method comprising: a third step of transmitting in a region of A signal transmission method for synchronization loss measurement in a mobile station device,
A first process in which the mobile station apparatus detects an uplink resynchronization factor with a base station apparatus;
When the mobile station apparatus detects the occurrence of the uplink resynchronization factor in the first process, the received signal is on a radio frame in which parameters used for synchronous communication with the base station apparatus are arranged. A second step of signal-extracting information representing an uplink synchronization request from a region in an information-specific manner representing the uplink synchronization request;
When the mobile station apparatus extracts information indicating the uplink synchronization request in the second process, a third process of generating a synchronization error measurement signal;
The mobile station apparatus comprises a fourth step of transmitting the synchronization error measurement signal. A method of transmitting a synchronization error measurement signal.

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