JP2014023017A - Mobile station device, base station device, communication system, communication method and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reduction of power consumption and radio resource use efficiency by efficient management of a moving speed between a mobile station device and a base station device.SOLUTION: A base station device 2 transmits a speed estimation suspension message to a mobile station device 1 (step S101), and the mobile station device 1 suspends moving speed determination processing currently in execution (step S102). The mobile station device 1 reports to the base station device 2 information of a state related to the estimated moving speed that is retained in the mobile station device 1 at that time point (step S103). The base station device 2 transmits a speed estimation start message to the mobile station device 1 that currently suspends the speed estimation (step S104). The mobile station device 1, on receiving the speed estimation start, starts (resumes) moving speed determination processing currently in suspension (step S105).

Description

  Embodiments of the present invention provide a mobile station device, a base station device, and a mobile station device that efficiently reduce the power consumption and improve the utilization efficiency of radio resources by efficiently managing the moving speed between the mobile station device and the base station device. The present invention relates to a communication system, a communication method, and an integrated circuit.

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

  In 3GPP, Advanced EUTRA is discussed for realizing higher-speed data transmission and having upward compatibility with EUTRA. In EUTRA and Advanced EUTRA, not only high-speed data communication is realized, but also a problem that the power consumption of the mobile station apparatus increases due to a plurality of applications constantly operating on the mobile station apparatus, and the radio consumed by the application There is also a discussion about the problem of increasing resources (Non-Patent Document 1, Non-Patent Document 2).

3GPP TR 36.822 V0.2.0 (2011-11), LTE RAN Enhancements for Diverse Data Applicationshttp: //www.3gpp.org/ftp/Specs/html-info/36822.htm

R2-116036, Signaling considerations for background traffic, 3GPP TSG-RAN WG2 meeting # 76, San Francisco, November 14-18ftp: //ftp.3gpp.org/tsg_ran/WG2_RL2/TSGR2_76/Docs/R2-116036.zip

  It is known that the power consumption of a mobile station apparatus is affected by the connection state and mobility state of the mobile station apparatus. For example, as shown in Non-Patent Document 2, when the mobile station apparatus is in a connected state, signaling for handover occurs when the mobile station apparatus moves, while the mobile station apparatus When in the disconnected state, a signal for handover is not generated when moving. Therefore, when the mobile station apparatus is high-speed (High mobility) and the traffic volume is small, it may be preferable to shift to a non-connected state in order to reduce the power consumption of the mobile station apparatus.

  Also, when the mobile station device is low mobility and the traffic volume is small, the amount of signaling due to handover hardly increases, so it is better to maintain the connection state in order to reduce the signaling required for connection. It may be.

  However, in the current EUTRA, since the moving speed is estimated by the mobile station apparatus, there is a possibility that it differs from the actual moving speed of the mobile station apparatus. In particular, since the estimated moving speed is estimated by the number of times the mobile station apparatus has moved the cell within a certain time, there is a problem that a different moving speed is estimated depending on the cell radius of the moving cell. there were. That is, if the reliability of the moving speed estimated by the mobile station apparatus is low, the base station apparatus performing control based on the moving speed increases the power consumption of the mobile station apparatus and the consumption of the radio resource amount. There is a concern that

  In view of the above problems, an object of an embodiment of the present invention is to efficiently reduce the power consumption and improve the utilization efficiency of radio resources by efficiently performing the movement speed management between the mobile station apparatus and the base station apparatus. An object of the present invention is to provide a mobile station device, a base station device, a communication system, a communication method, and an integrated circuit.

  In order to achieve the above object, the following measures were taken. That is, the mobile station apparatus according to the embodiment of the present invention is configured to estimate the state related to the moving speed of the mobile station apparatus and information necessary for estimating the state related to the moving speed based on the notification from the base station apparatus. A mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, including means for transmitting to the station apparatus and means for starting or stopping estimation of a state relating to a moving speed based on a notification from the base station apparatus It is.

  In addition, the mobile station apparatus according to the embodiment of the invention includes means for transmitting information on the state relating to the moving speed to the base station apparatus, means for updating the state relating to the moving speed of the mobile station apparatus when notified from the base station apparatus, and A mobile station apparatus in a communication system comprising a mobile station apparatus and a base station apparatus, including means for evaluating an event condition based on the updated state relating to the moving speed of the mobile station apparatus. As a result, the mobile station apparatus does not perform control based on the estimation result of the moving speed with low reliability, so that it is possible to reduce the power consumption of the mobile station apparatus and improve the utilization efficiency of radio resources.

  Further, the base station apparatus in the embodiment of the invention includes means for instructing transmission of state information relating to the moving speed of the mobile station apparatus estimated by the mobile station apparatus, and the moving speed of the mobile station apparatus implemented by the mobile station apparatus. A base station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, which includes means for notifying the start or stop of the state estimation process. As a result, the base station apparatus can instruct the start or stop of control based on the estimation result of the moving speed for each mobile station apparatus, so that scheduling is performed to reduce the power consumption of the mobile station apparatus and improve the utilization efficiency of radio resources. can do.

  The communication system according to the embodiment of the present invention is a communication system including a mobile station apparatus and a base station apparatus, and the base station apparatus instructs transmission of state information relating to the moving speed of the mobile station apparatus. The mobile station apparatus includes means for transmitting state information relating to the moving speed to the base station apparatus, and means for starting or stopping state estimation relating to the moving speed based on notification from the base station apparatus. It is.

  The communication system according to the embodiment of the present invention is a communication system including a mobile station apparatus and a base station apparatus, and the base station apparatus includes means for instructing transmission of state information related to a moving speed of the mobile station apparatus; Including means for estimating a state relating to the moving speed of the mobile station apparatus based on the transmitted state information relating to the moving speed, and means for notifying the mobile station apparatus of a state relating to the estimated moving speed of the mobile station apparatus. The station apparatus transmits a state information relating to the moving speed to the base station apparatus, a means for updating the state relating to the moving speed of the mobile station apparatus notified from the base station apparatus, and a moving speed of the updated mobile station apparatus. A communication system including means for evaluating an event condition based on a state. As a result, since the mobile station apparatus and the base station apparatus are not controlled based on the estimation result of the moving speed with low reliability, the power consumption of the mobile station apparatus can be reduced and the radio resources can be reduced by performing the scheduling efficiently. Utilization efficiency can be improved.

  A communication method according to an embodiment of the present invention is a communication method for a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, the step of estimating a state relating to the moving speed of the mobile station apparatus, A communication method comprising: transmitting state information related to speed to a base station apparatus; and starting or stopping state estimation related to moving speed based on a notification from the base station apparatus.

  A communication method in an embodiment of the invention is a communication method of a mobile station device in a communication system composed of a mobile station device and a base station device, and transmits information on a state related to a moving speed to the base station device; And a step of updating a state relating to the moving speed of the mobile station apparatus notified from the base station apparatus, and a step of evaluating an event condition based on the updated state relating to the moving speed of the mobile station apparatus.

  A communication method according to an embodiment of the invention is a communication method of a communication system including a mobile station apparatus and a base station apparatus, and the base station apparatus instructs transmission of state information related to the moving speed of the mobile station apparatus. The mobile station apparatus is a communication method in which the mobile station apparatus transmits state information related to the moving speed to the base station apparatus, and starts or stops estimating the state related to the moving speed based on a notification from the base station apparatus. .

  A communication method according to an embodiment of the invention is a communication method of a communication system including a mobile station apparatus and a base station apparatus, and the base station apparatus instructs transmission of state information related to the moving speed of the mobile station apparatus. A step of estimating a state relating to the moving speed of the mobile station device based on information on a state relating to the moving speed, and a step of notifying the mobile station device of a state relating to the estimated moving speed of the mobile station device, The mobile station apparatus transmits information on the state relating to the moving speed to the base station apparatus, updates the state relating to the moving speed of the mobile station apparatus notified from the base station apparatus, and the moving speed of the updated mobile station apparatus And a step of evaluating an event condition based on a state relating to the communication method. As a result, since the mobile station apparatus and the base station apparatus are not controlled based on the estimation result of the moving speed with low reliability, the power consumption of the mobile station apparatus can be reduced and the radio resources can be reduced by performing the scheduling efficiently. A communication method that improves utilization efficiency can be realized.

  An integrated circuit according to an embodiment of the invention is an integrated circuit mounted on a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, and has a function of estimating a state relating to a moving speed of the mobile station apparatus. And a function of transmitting information on the state relating to the moving speed to the base station device, and a function of starting or stopping the estimation of the state relating to the moving speed based on a notification from the base station device.

  An integrated circuit according to an embodiment of the present invention is an integrated circuit mounted on a mobile station apparatus in a communication system including a mobile station apparatus and a base station apparatus, and transmits state information related to a moving speed to the base station apparatus. An integrated circuit, a function of updating a state relating to the moving speed of the mobile station apparatus notified from the base station apparatus, and a function of evaluating an event condition based on the updated state relating to the moving speed of the mobile station apparatus It is.

  An integrated circuit according to an embodiment of the invention is an integrated circuit mounted on a base station apparatus in a communication system including a mobile station apparatus and a base station apparatus, and transmits state information related to the moving speed of the mobile station apparatus. Is an integrated circuit having a function for instructing the state of movement and a function for notifying the start or stop of the estimation of the state regarding the moving speed. Since the mobile station device and the base station device are not controlled based on the estimation result of the moving speed with low reliability, efficient scheduling can reduce the power consumption of the mobile station device and use efficiency of radio resources. An improved integrated circuit can be realized.

  In the present specification, each embodiment is disclosed in terms of a mobile station apparatus, a base station apparatus, a communication system, a communication method, and an integrated circuit that reduce power consumption and improve utilization efficiency of radio resources. The applicable communication method is not limited to a communication method that is upward compatible with EUTRA, such as EUTRA or Advanced EUTRA.

  For example, the techniques described herein include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal FDMA (OFDMA) systems, single carrier FDMA (SC -It can be used in various communication systems, such as FDMA) systems, and other systems. Further, in this specification, a system and a network can be used synonymously.

  In addition, the mobile station apparatus and the base station apparatus aggregate (aggregate) the frequencies (component carriers or frequency bands) of a plurality of different frequency bands (frequency bands) by carrier aggregation into one frequency (frequency band). ) May be applied. Component carriers include uplink component carriers corresponding to the uplink and downlink component carriers corresponding to the downlink.

  For example, when five component carriers having a frequency bandwidth of 20 MHz are aggregated by carrier aggregation, a mobile station apparatus capable of carrier aggregation performs transmission / reception by regarding these as one frequency bandwidth of 100 MHz. The component carriers to be aggregated may be continuous frequencies, or may be frequencies at which all or part of them are discontinuous. For example, when the usable frequency band is 800 MHz band, 2.4 GHz band, and 3.4 GHz band, one component carrier is 800 MHz band, another component carrier is 2 GHz band, and another component carrier is 3.4 GHz band. It may be transmitted.

  It is also possible to aggregate a plurality of continuous or discontinuous component carriers in the same frequency band. The frequency bandwidth of each component carrier may be a frequency bandwidth narrower than the receivable frequency bandwidth (for example, 20 MHz) of the mobile station apparatus, or the frequency bandwidth may be different. The frequency bandwidth is preferably equal to one of the conventional cell frequency bandwidths in consideration of backward compatibility. Note that the number of uplink component carriers that the base station apparatus assigns (sets or adds) to the mobile station apparatus is desirably the same as or less than the number of downlink component carriers.

  According to the embodiments of the present invention, a mobile station apparatus and a base station that reduce power consumption and improve the utilization efficiency of radio resources by efficiently managing the moving speed between the mobile station apparatus and the base station apparatus. An apparatus, a communication system, a communication method, and an integrated circuit can be provided.

It is a block diagram which shows schematic structure of the mobile station apparatus in embodiment of this invention. It is a block diagram which shows schematic structure of the base station apparatus in embodiment of this invention. It is a sequence chart figure showing an example of processing about movement speed in a 1st embodiment of the present invention. It is a sequence chart figure which shows another example of the process regarding the moving speed in the 1st Embodiment of this invention. It is a sequence chart figure which shows an example of the process regarding the moving speed at the time of the handover in the 2nd Embodiment of this invention.

  Prior to describing each embodiment of the present invention, techniques related to each embodiment of the present invention will be briefly described below.

[Physical channel / Physical signal]
The main physical channels and physical signals used in EUTRA and Advanced EUTRA will be described. A channel means a medium used for transmission of signals (signal information), and a physical channel means a physical medium used for transmission of signals (signal information). In the present invention, a physical channel can be used synonymously with a signal. The physical channel may be added in the future in EUTRA and Advanced EUTRA, or the structure and format of the physical channel may be changed or added. It does not affect.

  In EUTRA and Advanced EUTRA, scheduling of physical channels / physical signals is managed using radio frames. One radio frame is 10 ms, and one radio frame is composed of 10 subframes. Further, one subframe is composed of two slots (that is, one subframe is 1 ms, and one slot is 0.5 ms). Also, resource blocks are used as a minimum scheduling unit in which physical channels are allocated. A resource block is defined by a constant frequency region composed of a set of a plurality of subcarriers (for example, 12 subcarriers) and a region composed of a constant transmission time interval (1 slot) on the frequency axis.

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

  A physical broadcast information channel (PBCH; Physical Broadcast Channel) is transmitted for the purpose of notifying control parameters (broadcast information (system information): System information) commonly used by mobile station apparatuses in a cell. Broadcast information that is not notified on the physical broadcast information channel is transmitted as a layer 3 message (system information) on the physical downlink shared channel after the radio resource is notified on the physical downlink control channel. As broadcast information, a cell global identifier (CGI) indicating a cell-specific identifier, a tracking area identifier (TAI) for managing a standby area by paging, random access setting information (such as a transmission timing timer), Common radio resource setting information and the like are notified. The broadcast information is also used to notify access restriction information when accessing the cell and common channel control settings.

  The downlink reference signal is classified into a plurality of types according to its use. For example, cell-specific reference signals (RS) are pilot signals transmitted at a predetermined power for each cell, and are downlink reference signals that are periodically repeated in the frequency domain and the time domain based on a predetermined rule. It is. A mobile station apparatus measures reception quality for every cell by receiving cell specific RS. The mobile station apparatus also uses the downlink cell-specific RS as a reference signal for demodulating the physical downlink control channel or the physical downlink shared channel transmitted simultaneously with the cell-specific RS. As a sequence used for the cell-specific RS, a sequence that can be identified for each cell is used.

  The downlink reference signal is also used for estimation of downlink propagation path fluctuations. A downlink reference signal used for estimation of propagation path fluctuation is referred to as a channel state information reference signal (CSI-RS). The downlink reference signal set individually for each mobile station apparatus is called UE specific reference signals (URS) or Dedicated RS (DRS), and demodulates the physical downlink control channel or the physical downlink shared channel. Sometimes referred to for channel compensation processing.

  A physical downlink control channel (PDCCH) is transmitted in several OFDM symbols (for example, 1 to 4 OFDM symbols) from the head of each subframe, and follows the scheduling of the base station apparatus to the mobile station apparatus. It is used for the purpose of instructing the radio resource allocation information and the adjustment amount of increase / decrease in transmission power. The mobile station apparatus monitors (monitors) the physical downlink control channel addressed to the local station apparatus before transmitting / receiving a layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data. By receiving the physical downlink control channel addressed to the device, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant (downlink assignment) at the time of reception from the physical downlink control channel. The physical downlink control channel is configured to be transmitted in the area of the resource block that is individually assigned to the mobile station apparatus from the base station apparatus in addition to the above-described ODFM symbol. Is also possible.

  The physical uplink control channel (PUCCH) is a reception confirmation response (ACK / NACK; Acknowledgement / Negative Acknowledgment) or downlink propagation path (channel state) information transmitted on the physical downlink shared channel. (CSI; Channel State Information), used for making a scheduling request (SR) that is an uplink radio resource allocation request (radio resource request). CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), and RI (Rank Indicator). Each indicator may be expressed as “Indication”, but its use and meaning are the same.

  The physical downlink shared channel (PDSCH) is used to notify the mobile station device as layer 3 message of broadcast information (system information) not notified by the paging or physical broadcast information channel in addition to downlink data. used. The radio resource allocation information of the physical downlink shared channel is indicated by the physical downlink control channel. The physical downlink shared channel is transmitted after being arranged in an OFDM symbol other than the OFDM symbol through which the physical downlink control channel is transmitted. That is, the physical downlink shared channel and the physical downlink control channel are time division multiplexed within one subframe.

  A physical uplink shared channel (PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. In addition to uplink data, it is also used to notify the base station apparatus of uplink control information as a layer 3 message. Similarly to the downlink, the radio resource allocation information of the physical uplink shared channel is indicated by the physical downlink control channel.

  The uplink reference signal (uplink reference signal; uplink pilot signal, also referred to as uplink pilot channel) is transmitted from the base station apparatus to the physical uplink control channel PUCCH and / or the physical uplink shared channel PUSCH. A demodulation reference signal (DMRS) used for demodulation and a sounding reference signal (SRS) used mainly by the base station apparatus to estimate an uplink channel state are included. It is. The sounding reference signal includes a periodic sounding reference signal (Periodic SRS) and an aperiodic sounding reference signal (Aperiodic SRS).

  A physical random access channel (PRACH) is a channel used for notifying a preamble sequence and has a guard time. The preamble sequence is configured so as to express 6-bit information by preparing 64 types of sequences. The physical random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus. The mobile station apparatus transmits a radio resource request when the physical uplink control channel is not set, and transmission timing adjustment information (Timing Advance (TA)) necessary to match the uplink transmission timing with the reception timing window of the base station apparatus. The physical random access channel is used to request the base station apparatus.

  Specifically, the mobile station apparatus transmits a preamble sequence using the radio resource for the physical random access channel set by the base station apparatus. The mobile station apparatus that has received the transmission timing adjustment information commonly uses transmission information (TA timer) that counts the effective time of transmission timing adjustment information that is commonly set by broadcast information (or set individually by a layer 3 message). The uplink state is managed while the transmission timing timer is in the transmission timing adjustment state during the effective time (during time measurement) and the transmission timing is not adjusted (transmission timing unadjusted state) outside the effective period (during stop).

  The layer 3 message is a control-plane message exchanged between the mobile station apparatus and the RRC (Radio Resource Control) layer of the base station apparatus, and may be used synonymously with RRC signaling or RRC message. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Wireless network]
The communicable range of each frequency controlled by the base station apparatus is regarded as a cell. At this time, the areas (cells) covered by each frequency may have different widths and different shapes. Moreover, the area to cover may differ for every frequency. When a mobile station device operates in a cell and moves from one cell to another cell, it is a cell reselection procedure during non-wireless connection (non-communication, idle state), and during wireless connection (communication, connection). Ted state) is moved to another suitable cell by the handover procedure. A suitable cell generally indicates a cell that is the best cell for a mobile station apparatus in which access to the mobile station apparatus is not prohibited and a measurement result of downlink reception quality is available.

  Note that carrier aggregation is communication performed by a plurality of cells using a plurality of component carriers (frequency bands), and is also referred to as cell aggregation. The mobile station apparatus may be wirelessly connected to the base station apparatus via a relay station apparatus (or repeater) for each frequency. That is, the base station apparatus of each embodiment of the present invention can be replaced with a relay station apparatus (or repeater).

  A base station apparatus defined by 3GPP is referred to as a Node B (NodeB), and a base station apparatus in EUTRA and Advanced EUTRA is referred to as an eNodeB (eNodeB). A mobile station apparatus in EUTRA and Advanced EUTRA defined by 3GPP is referred to as a UE (User Equipment). The base station apparatus manages, for each frequency, a cell that is an area in which the mobile station apparatus can communicate with the base station apparatus. A cell is also referred to as a macro cell, a femto cell, a pico cell, or a nano cell depending on the size of an area that can communicate with a mobile station apparatus. In addition, when the mobile station device can communicate with a certain base station device, the cell used for communication with the mobile station device among the cells of the base station device is a serving cell. This cell is referred to as a neighbor cell.

[Movement speed management]
The mobile station apparatus compares the number of cells moved by handover or cell reselection (cell reselection) within a set time with a threshold value, and determines (estimates) the moving speed of the local station apparatus. Estimating the moving speed is also referred to as mobility state estimation (MSE). The state of the mobile station apparatus determined based on the estimated moving speed is referred to as a mobility state.

  The set time and threshold value used for mobility state estimation are notified from the base station apparatus to the mobile station apparatus. In EUTRA, two set times (set time 1, set time 2) and two threshold values (threshold value 1, threshold value 2) are set. For example, the mobile station apparatus determines that the speed is 1 if the number of cells that have moved within a certain set time 1 is less than the threshold 1, and determines that the speed is 2 if the number is greater than or equal to the threshold 1 and less than the threshold 2. If it is above, it determines with speed 3. By increasing the threshold value, the mobile station apparatus can also determine a finer moving speed.

  Further, if the moving speed estimated by the mobile station apparatus within a certain set time 2 is neither determined as the speed 2 nor the speed 3, the mobile station apparatus determines that the moving speed of the own station apparatus is the speed 1. . The speed 1 indicates the slowest state, and the speed 3 indicates the fastest state. Speed 2 indicates an intermediate speed state. That is, as a mobility state, speed 1 is determined as a normal mobility state (Normal Mobility State), speed 2 is determined as an intermediate mobility state (Medium Mobility State), and speed 3 is determined as a high mobility state (High Mobility State).

  The mobile station apparatus performs control based on an estimation result (that is, mobility state) by mobility state estimation. For example, when evaluating an event condition or cell reselection condition (reselection criterion) used for handover, the mobile station apparatus determines a parameter value of a necessary time required until the above conditions are satisfied based on the mobility state. And scale. That is, the mobile station apparatus evaluates each condition by scaling so that the required time in the intermediate mobility state is shorter than the required time in the normal mobility state. Similarly, the mobile station apparatus scales so that the required time in the high-speed mobility state is shorter than the required time in the intermediate mobility state. Scaling coefficients used for scaling are set from the base station apparatus by broadcast information or individual RRC signaling, respectively. The necessary time to be scaled is also referred to as time-to-trigger (TTT).

  In consideration of the above matters, preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the embodiment of the present invention, when it is determined that a specific description of known functions and configurations related to the embodiment of the present invention obscures the gist of the embodiment of the present invention. Detailed description thereof will be omitted.

<First Embodiment>
A first embodiment of the present invention will be described below. The present embodiment relates to a radio resource request method of the mobile station apparatus 1, and particularly shows a radio resource request method based on determination of a radio resource request method when the mobile station apparatus 1 is communicating.

  FIG. 1 is a block diagram showing an example of a mobile station apparatus 1 according to the first embodiment of the present invention. The mobile station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a measurement processing unit 104, a control unit 105, an uplink buffer control unit 106, an encoding unit 107, a modulation unit 108, a transmission unit 109, an uplink radio. A resource request control unit 110, a random access control unit 111, and an upper layer 112 are included. The upper layer 112 is a block that realizes a specific function of an RRC (Radio Resource Control) layer that performs radio resource control. The uplink buffer control unit 106, the uplink radio resource request control unit 110, and the random access control unit 111 are blocks that realize specific functions of a MAC (Medium Access Control) layer that manages the data link layer.

  Note that the mobile station apparatus 1 has a reception system block (reception unit 101, demodulation unit 102, decoding unit 103) to support simultaneous reception of a plurality of frequencies (frequency band, frequency bandwidth) by carrier aggregation, and In order to support simultaneous transmission of a plurality of frequencies (frequency bands, frequency bandwidths), a plurality of transmission system blocks (encoding unit 107, modulation unit 108, transmission unit 109) may be provided.

  Regarding reception, mobile station apparatus control information is input from the upper layer 112 to the control unit 105. The mobile station apparatus control information is information necessary for radio communication control of the mobile station apparatus 1 configured by the reception control information and the transmission control information. The radio connection resource setting, cell-specific transmission individually transmitted from the base station apparatus 2 The higher layer 112 inputs the information to the control unit 105 as necessary. The control unit 105 appropriately inputs reception control information that is control information related to reception to the reception unit 101, the demodulation unit 102, and the decoding unit 103.

  The reception control information includes information such as DRX control information, reception timing for each channel, multiplexing method, and radio resource arrangement information in addition to reception frequency band information. Further, the control unit 105 inputs measurement setting information used for measurement event determination as to whether or not the measurement result of the mobile station apparatus 1 satisfies the designated measurement event to the measurement processing unit 104. The measurement setting information can include a plurality of different types of measurement events. In the measurement setting information, a different measurement event may be set from the base station apparatus 2 for each cell or for each frequency.

  The reception signal is received by the reception unit 101. The receiving unit 101 receives a signal in the frequency band specified by the reception control information. Moreover, the receiving part 101 performs PDCCH monitoring according to a PDCCH monitoring timer, when the PDCCH monitoring timer setting mentioned later is applied as reception control information. The received signal is input to the demodulation unit 102. Demodulation section 102 demodulates the received signal, inputs the signal to decoding section 103 to correctly decode downlink data and downlink control data, and inputs each decoded data to upper layer 112. Each data is also input to the measurement processing unit 104.

  The measurement processing unit 104 measures a measurement value of downlink reference signal reception quality (SIR, SINR, RSRP, RSRQ, RSSI, path loss, etc.) for each cell (component carrier), a physical downlink control channel, or a physical downlink shared channel. The measurement result information is generated based on the measurement result of the reception error rate. The measurement processing unit 104 also uses the measurement result as one of parameters for determining success or failure of the set measurement event.

  In addition, the measurement processing unit 104 inputs the measurement result to the upper layer 112 as measurement result information. In addition, when one or a plurality of set measurement events are established (that is, when a set measurement event condition is satisfied), the measurement processing unit 104 displays a measurement event result indicating the content of the established measurement event as a measurement result. Information is sent to the upper layer 112 as information. In addition, the measurement processing unit 104 displays the measurement event result indicating the content of the measurement event that is not satisfied when the measurement event once satisfied is not satisfied (that is, when the set measurement event condition is not satisfied). You may notify to the upper layer 112 as measurement result information.

  Also, regarding transmission, mobile station apparatus control information that is a control parameter for controlling each block is input from the upper layer 112 to the control unit 105, and transmission control information that is control information regarding transmission is transmitted to the uplink buffer control unit 106. Are appropriately input to the encoding unit 107, the modulation unit 108, and the transmission unit 109. The transmission control information includes information such as DTX control information, coding information, modulation information, transmission frequency band information, transmission timing for each channel, multiplexing method, and radio resource allocation information as uplink scheduling information of the transmission signal. ing.

  Random access setting information is input from the upper layer 112 to the random access control unit 111. The random access setting information includes preamble information, radio resource information for transmission of a physical random access channel (power adjustment parameter, maximum preamble retransmission count, etc.), and the like. Further, the upper layer 112 manages transmission timing adjustment information and a transmission timing timer used for uplink transmission timing adjustment, and states of uplink transmission timing (transmission timing adjustment) for each cell (or for each cell group and each TA group). Status or transmission timing non-adjusted state). The transmission timing adjustment information and the transmission timing timer are included in the transmission control information.

  When it is necessary to manage a plurality of uplink transmission timing states, the upper layer 112 manages transmission timing adjustment information corresponding to the uplink transmission timing of each of the plurality of cells (or cell groups and TA groups). To do.

  The generated transmission data (uplink data and uplink control data) is input from the upper layer 112 to the uplink buffer control unit 106 at an arbitrary timing. At this time, the uplink buffer control unit 106 calculates the amount of input transmission data (uplink buffer amount). Resource request setting information is set in the uplink radio resource request control unit 110 by the higher layer 112. The resource request setting information includes at least transmission counter setting information and radio resource request prohibition timer information. Further, when the transmission data is input to the uplink buffer control unit 106, the uplink buffer control unit 106 notifies the uplink radio resource request control unit 110 of the generation of the transmission data, thereby transmitting to the uplink buffer. Signals that data exists.

  The uplink radio resource request control unit 110 determines whether radio resources necessary for transmitting the input transmission data are allocated. The uplink radio resource request control unit 110 generates one of a physical uplink shared channel PUSCH, a radio resource request using a physical uplink control channel (SR-PUCCH), or a physical random access channel based on radio resource allocation. Select and request control processing for transmitting the selected channel to the encoding unit 107 and / or the random access control unit 111.

  That is, when radio resources have already been allocated and transmission data can be transmitted using the physical uplink shared channel PUSCH, the encoding unit 107 allocates radio resources that have been allocated in accordance with an instruction from the uplink radio resource request control unit 110. The transmission data corresponding to is acquired from the uplink buffer control unit 106, encoded, and output to the modulation unit 108. Alternatively, when radio resources are not allocated and when a radio resource request (SR-PUCCH) using a physical uplink control channel is possible, the encoding unit 107 performs SR- in accordance with an instruction from the uplink radio resource request control unit 110. Control data necessary for transmission of PUCCH is encoded and output to modulation section 108.

  Alternatively, when the radio resource is not allocated and the radio resource request (SR-PUCCH) by the physical uplink control channel is impossible, the encoding unit 107 performs the random access procedure for the random access control unit 111. Instruct to start. At this time, the encoding unit 107 generates a preamble sequence transmitted through the physical random access channel based on the random access data information input from the random access control unit 111. The encoding unit 107 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit 108.

  Modulation section 108 appropriately performs modulation processing based on the channel structure for transmitting the output from coding section 107. The transmission unit 109 maps the output of the modulation unit 108 to the frequency domain, converts the frequency domain signal into a time domain signal, and performs power amplification on a carrier wave of a predetermined frequency. The transmission unit 109 also adjusts the uplink transmission timing according to the transmission timing adjustment information for each cell (also for each cell group and each TA group) input from the higher layer 112. The physical uplink shared channel in which the uplink control data is arranged can include, for example, a layer 3 message (radio resource control message; RRC message) in addition to the user data.

  In FIG. 1, other components of the mobile station apparatus 1 are omitted because they are not particularly strongly related to the present embodiment, but a plurality of blocks having other functions necessary for operating as the mobile station apparatus 1 are omitted. It is clear to have as a component. Further, the mobile station device 1 may be configured to realize the functions of the plurality of blocks described above with one block. Further, the mobile station apparatus 1 may be configured to realize the function of one block described above with a plurality of blocks.

  FIG. 2 is a block diagram showing an example of the base station apparatus 2 according to the first embodiment of the present invention. The base station apparatus includes a reception unit 201, a demodulation unit 202, a decoding unit 203, a control unit 204, a coding unit 205, a modulation unit 206, a transmission unit 207, an upper layer 208, and a network signal transmission / reception unit 209. Note that the base station apparatus 2 includes a reception system block (reception unit 201, demodulation unit 202, decoding unit 203) and a transmission system block (encoding unit) in order to support a plurality of frequencies (frequency bands and frequency bandwidths). 205, a modulation unit 206, and a transmission unit 207) may be provided.

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

  In addition, the reception unit 201 converts a signal received from the mobile station device 1 into a baseband digital signal. When cells having a plurality of different transmission timings are set for the mobile station apparatus 1, the reception unit 201 receives signals at different timings for each cell (also for each cell group and each TA group). The digital signal converted by the reception unit 201 is input to the demodulation unit 202 and demodulated. The signal demodulated by the demodulation unit 202 is then input to the decoding unit 203 and decoded, and the correctly decoded uplink control data and uplink data are output to the upper layer 208.

  Base station apparatus control information necessary for control of each block is information necessary for radio communication control of the base station apparatus 2 configured by reception control information and transmission control information, and a higher-level network apparatus (MME or gateway apparatus). , OAM) and system parameters, and the upper layer 208 inputs to the control unit 204 as necessary.

  The control unit 204 transmits base station apparatus control information related to transmission to each block of the encoding unit 205, modulation unit 206, and transmission unit 207 as transmission control information, and base station apparatus control information related to reception to the reception control information. Are appropriately input to each block of the receiving unit 201, the demodulating unit 202, and the decoding unit 203. The RRC of the base station device 2 exists as part of the upper layer 208.

  On the other hand, the network signal transmission / reception unit 209 transmits (transfers) or receives a control message or user data between the base station apparatuses 2 or between the upper network apparatus and the base station apparatus 2. In FIG. 2, other components of the base station device 2 are omitted because they are not particularly strongly related to the present embodiment, but a plurality of blocks having other functions necessary for operating as the base station device 2 are omitted. It is clear to have as a component. Further, the base station apparatus 2 may be configured to realize the functions of the plurality of blocks described above with one block. Further, the base station apparatus 2 may be configured to realize the function of one block described above with a plurality of blocks.

  FIG. 3 is a diagram illustrating exchange of information related to transmission / reception control between the mobile station apparatus 1 and the base station apparatus 2 in the present embodiment.

  The mobile station device 1 and the base station device 2 are started from a state in which they are wirelessly connected (RRC connection state, RRC_Connected). That is, the mobile station apparatus 1 receives control information (measurement configuration: Measurement Configuration) related to measurement control from the base station apparatus 2 and measures the serving cell and the neighboring cells.

  Also, the mobile station apparatus 1 is set with information (MSE information) related to the estimation of the mobility state for determining (estimating) the moving speed from the base station apparatus 2. The mobile station device 1 receives and sets the MSE information from the base station device 2 using broadcast information or individual RRC messages, and estimates the moving speed. In the following description, the mobile station device 1 performs the estimation of the moving speed (speed estimation) and the mobile station device 1 performs the determination of the mobility state estimation in the same meaning. Moreover, in the following description, the mobile station device 1 stops moving speed estimation (speed estimation) and the mobile station device 1 stops determining mobility state estimation in the same meaning. .

  First, the base station apparatus 2 transmits a speed estimation stop (speed estimation stop message) to the mobile station apparatus 1 (step S101). The rate estimation stop (rate estimation stop message) is preferably transmitted using a layer 3 message (RRC message) or a layer 2 message, but may be transmitted in a layer 1 message. A layer 2 message is a message that is interpreted by a layer 2 configuration task, and is a control command that is recognized by layer 2 after being decoded by the physical layer (layer 1). Note that the layer 2 message in EUTRA and Advanced EUTRA may be notified by a control command (MAC control element: MAC control message) interpreted in the MAC layer.

  Receiving the speed estimation stop, the mobile station apparatus 1 stops the determination process of the moving speed being executed (step S102). The mobile station apparatus 1 may stop or reset the time of a set time (moving speed estimation timer) used for estimating the moving speed set in the mobile station apparatus 1. Further, the mobile station apparatus 1 notified of the stoppage of the speed estimation does not count the number of moved cells even when the mobile station apparatus 1 moves to another cell by handover or cell reselection. The mobile station device 1 may reset the number of cells that have moved to the present time. Moreover, the mobile station apparatus 1 notified of the speed estimation stop may reset the current movement speed (mobility state estimation). Also, the mobile station apparatus 1 notified of the speed estimation stop may reset the number of moved cells currently held.

  The base station device 2 may notify the mobile station device 1 of the speed estimation stop, and at the same time, may transmit the travel speed used by the mobile station device 1 after the stop.

  In addition, the mobile station apparatus 1 that has received the speed estimation stop may report information on a state (mobility state) related to the estimated moving speed held by the mobile station apparatus 1 at that time to the base station apparatus 2 ( Step S103). With this report, the base station apparatus 2 can perform control related to the moving speed estimated by the mobile station apparatus 1. The rate estimation report (rate estimation report message) is preferably transmitted using a layer 3 message (RRC message) or a layer 2 message, but may be transmitted in a layer 1 message.

  The base station apparatus 2 transmits a speed estimation start (speed estimation start message) to the mobile station apparatus 1 that has stopped speed estimation (step S104). Receiving the speed estimation start, the mobile station apparatus 1 starts (restarts) the determination process of the stopped moving speed (step S105). That is, the mobile station apparatus 1 restores all the functions stopped in step S101, and performs processing related to conventional estimation of the moving speed. The rate estimation start (rate estimation start message) is preferably transmitted using a layer 3 message (RRC message) or a layer 2 message, but may be transmitted as a layer 1 message.

  The base station apparatus 2 may notify the mobile station apparatus 1 of the start of speed estimation, and at the same time, may clearly indicate information on the state of movement (mobility state) used after the start by a measurement estimation start message.

  Note that the speed estimation start and the speed estimation stop may be configured to have the same message configuration and toggle each other's processing.

  FIG. 3 is mainly described for the mobile station apparatus 1 in a wireless connection state, but may be applied even in a state where the mobile station apparatus 1 is not wirelessly connected (RRC idle state, RRC_Idle state). . At this time, the base station apparatus 2 may notify the mobile station apparatus 1 of the speed estimation stop using a part of the broadcast information.

  With this configuration, the mobile station apparatus 1 estimates the moving speed in an environment in which a plurality of cells having different cell radii are arranged, thereby reducing the reliability of the estimated moving speed. It can be solved. However, the state information relating to the moving speed (mobility state) itself is useful information for reducing power consumption and the amount of radio resources. Therefore, instead of stopping the processing related to the estimation of the moving speed performed by the mobile station apparatus 1, a method is shown in which the base station apparatus 2 can execute the processing related to the estimation of the moving speed of the mobile station apparatus 1.

  FIG. 4 is a sequence chart for explaining a method of estimating the moving speed of the mobile station apparatus 1 by the base station apparatus 2 instead of stopping the processing related to the estimation of the moving speed performed by the mobile station apparatus 1. is there.

  In FIG. 4, the mobile station apparatus 1 sends all or a part of information (speed estimation information) necessary for estimating the moving speed held by the mobile station apparatus 1 until step S201 to the base station apparatus 2. To send. The speed estimation information (speed estimation information message) is preferably transmitted using a layer 3 message (RRC message) or a layer 2 message.

  When the mobile station apparatus 1 receives a request from the base station apparatus 2, when the estimation of the moving speed is stopped, or when the mobile station apparatus 1 shifts to the connected state, the mobile station apparatus 1 transmits the speed estimation information to the base station apparatus. 2 to send.

  The speed estimation information may be cell ID information and time information (time stamp) when the mobile station apparatus 1 moves to the cell. Alternatively, the speed estimation information may be physical cell ID information and time information that the mobile station apparatus 1 has stayed in that cell. Alternatively, the speed estimation information may be the number of cells to which the mobile station apparatus 1 has moved within one or a plurality of set times. Alternatively, the speed estimation information may be physical cell ID information of a cell to which the mobile station apparatus 1 has moved within one or a plurality of set times. Alternatively, the speed estimation information may be the number of cells having a small cell radius that the mobile station apparatus 1 has moved within one or more set times. Alternatively, the speed estimation information may be physical cell ID information of a cell having a small cell radius in which the mobile station apparatus 1 has moved within one or a plurality of set times.

  The mobile station apparatus 1 may provide a state (mobility state) related to the estimated current moving speed in addition to any of the speed estimation information described above. A cell having a small cell radius is a cell indicated by the physical cell ID information set by the base station apparatus 2, and is, for example, a pico cell. The physical cell ID information may be information indicating a range of physical cell IDs including a plurality of physical cell IDs. The physical cell ID information may be a cell global identifier. Moreover, the mobile station apparatus 1 may provide the information regarding the cell size of the moved cell or the information regarding the transmission power of the moved cell, in addition to any of the speed estimation information described above.

  Based on the provided speed estimation information, the base station apparatus 2 starts processing related to speed estimation of the mobile station apparatus 1 (base station apparatus side movement speed estimation) (step S202). The method for estimating the moving speed related to the mobile station apparatus 1 performed in the base station apparatus 2 may depend on the implementation of the base station apparatus 2. Based on the information regarding the moving speed of the mobile station apparatus 1 estimated by the base station apparatus 2, the base station apparatus 2 can perform efficient scheduling that can reduce power consumption and improve the utilization efficiency of radio resources. .

  The base station apparatus 2 transmits the estimation result of the moving speed of the mobile station apparatus 1 obtained in step S202 to the mobile station apparatus 1 using a speed estimation instruction (speed estimation instruction message) (step S203). The rate estimation instruction is preferably transmitted using a layer 3 message (RRC message) or a layer 2 message. The estimation result of the moving speed notified by the speed estimation instruction may be the same as the estimation result (mobility state) by the mobility state estimation. That is, one of the normal mobility state, the intermediate mobility state, and the high-speed mobility state is notified. The mobile station apparatus 1 may determine the notified movement speed estimation result as the current movement speed of the local station apparatus and update the movement speed (step S204). The mobile station apparatus 1 may perform scaling of a necessary time required for establishment of an event condition or a cell reselection condition used for handover based on the notified estimation result of the moving speed.

  Moreover, the base station apparatus 2 may notify the effective time of the notified estimated moving speed in addition to the estimated moving speed. When the valid time is set, the mobile station device 1 starts measuring a timer equal to the valid time, and releases the notified estimation result of the moving speed when the timer expires. The moving speed (mobility state) of the mobile station apparatus 1 after the release may be the default state of the cell or the normal mobility state.

  When the mobile station apparatus 1 transitions from the connected state to the disconnected state, it may be determined whether the processing for estimating the moving speed is to be resumed or stopped based on the broadcast information of the selected cell. At this time, when the information regarding the restart or stop is not set in the broadcast information of the selected cell, the movement speed estimation process may be automatically restarted. Alternatively, when the mobile station device 1 shifts from the connected state to the disconnected state, the movement speed estimation process may be automatically restarted.

  Each control message in FIGS. 3 and 4 may be reused by extending an existing RRC message, in addition to preparing a new dedicated message. For example, a speed estimation stop message, a speed estimation start message, and a speed estimation instruction message (may be signaling) are an RRC radio connection reconfiguration message (RRC Connection Reconfiguration message), a speed estimation report, and a speed estimation information are a measurement report message (Measurement). A necessary parameter may be added to each of the (report message) and reused.

  The mobile station apparatus 1 of the present embodiment may stop the estimation of the moving speed according to the instruction from the base station apparatus 2 in an area where the reliability of the estimated moving speed determined by the mobile station apparatus 1 is expected to be low. it can. In addition, in an area where the reliability of the estimation result of the moving speed determined by the mobile station apparatus 1 is expected to be high, the estimation of the moving speed can be started according to the instruction from the base station apparatus 2. In addition, when the mobile station apparatus 1 is instructed by the base station apparatus 2 to stop the estimation result of the moving speed, the mobile station apparatus 1 can notify the base station apparatus 2 of the estimation result of the current moving speed of the local station apparatus. In addition, the base station apparatus 2 can be provided with information related to the estimation of the movement speed currently held so that the base station apparatus 2 can estimate the movement speed of the mobile station apparatus 1.

  Further, the base station apparatus 2 of the present embodiment stops the estimation of the moving speed performed by the mobile station apparatus 1 in an area where the reliability of the estimated moving speed determined by the mobile station apparatus 1 is expected to be low. Can do. In addition, in the area where the reliability of the estimation result of the moving speed determined by the mobile station apparatus 1 is expected to be high, the estimation of the moving speed performed by the mobile station apparatus 1 can be started. That is, ON / OFF of the estimation of the moving speed of the mobile station device 1 can be explicitly switched.

  Further, the base station apparatus 2 estimates the moving speed of the mobile station apparatus 1 on behalf of the mobile station apparatus 1 by receiving information related to the estimation of the moving speed currently held by the mobile station apparatus 1. be able to. Further, the base station apparatus 2 can instruct the mobile station apparatus 1 of the estimated result of the estimated movement speed of the mobile station apparatus 1, and can update the movement speed (mobility state) of the mobile station apparatus 1.

  As described above, according to the first embodiment, the mobile station apparatus 1 is instructed to start or stop the process related to the estimation of the movement speed for the movement speed management from the base station apparatus 2, so that the wrong mobility state Is no longer determined. In addition, the base station apparatus 2 can estimate the moving speed more accurately by having the mobile station apparatus 1 provide information on the moving speed estimation. As a result, the mobile station apparatus 1 and the base station apparatus 2 of this communication system can reduce power consumption and improve the utilization efficiency of radio resources while efficiently managing the moving speed.

<Second Embodiment>
A second embodiment of the present invention will be described below. In the second embodiment, an efficient moving speed management method when a mobile station apparatus moves between cells is disclosed. The configurations of the mobile station device 1 and the base station device 2 used in the present embodiment may be the same as those shown in FIGS.

  The first method for managing the moving speed in handover is that when the mobile station apparatus 1 moves from cell to cell, the base station apparatus 2 of the source cell (source cell) moves to the base of the destination cell (target cell). This is a method of notifying the station apparatus 2 of the current movement speed estimation result. More specifically, information on the moving speed of the mobile station device 1 is the base station of the source cell in a base station device message (X2 message) exchanged between the base station devices 2 when the mobile station device 1 moves between cells. The notification is sent from the device 2 to the base station device 2 of the target cell.

  The base station apparatus 2 of the target cell can perform efficient scheduling that can reduce power consumption and improve the utilization efficiency of radio resources based on the notified information regarding the moving speed of the mobile station apparatus 1.

  The information on the moving speed includes, for example, the mobility state provided in the speed estimation report message, the information necessary for estimating the moving speed provided in the speed estimation information message, and the movement speed managed by the base station apparatus 2. Information necessary for calculation.

  In the first method, the mobile station apparatus 1 is instructed by the base station apparatus 2 to stop the estimation of the movement speed, and again instructs the stop of the estimation of the movement speed in the message related to the handover. If not (set), the stop of the estimation of the moving speed may be canceled, and the mobile station apparatus 1 may return to the conventional processing in which the moving speed is estimated. The message related to handover is an RRC connection reconfiguration message.

  Alternatively, in the first method, the mobile station device 1 is instructed by the base station device 2 to stop the estimation of the moving speed, and instructed to stop the estimation of the moving speed in the message related to the handover ( If it is not set, the stop of the estimation of the moving speed may be continued.

  FIG. 5 is a sequence chart showing the movement speed management when the mobile station apparatus 1 changes the base station apparatus 2 by handover.

  When instructed by the base station apparatus 2, the mobile station apparatus 1 performs a handover procedure (step S301). When the handover procedure is normally completed, the base station apparatus 2 estimates the moving speed of the mobile station apparatus 1 provided in the handover procedure, and updates the estimation result information if necessary (step S302). ). When the updated estimation result of the moving speed is different from the moving speed instructed to the handed over mobile station apparatus 1, a speed estimation instruction (speed estimation instruction message) is transmitted, and the moving speed of the mobile station apparatus 1 ( Update mobility state.

  The second method for managing the moving speed in the handover is that the mobile station apparatus 1 notifies the information about the moving speed in the destination cell (target cell) after the mobile station apparatus 1 moves the cell. . The information on the moving speed is information necessary for estimating the moving speed provided by the speed estimation report message or the mobility state provided by the speed estimation information message, for example.

  When the mobile station apparatus 1 is instructed to provide information related to the moving speed of the mobile station apparatus 1 in any of the messages related to handover, the mobile station apparatus 1 notifies the information related to the moving speed in the target cell. For example, provision of information regarding the moving speed of the mobile station device 1 may be instructed by an RRC connection reconfiguration message.

  Alternatively, when provision of information on the moving speed of the mobile station apparatus 1 is instructed by the broadcast information of the target cell, information on the moving speed is notified in the target cell. For example, the base station apparatus 2 may explicitly indicate that it is necessary to provide information on the moving speed after the handover with the broadcast information by setting specific information, When information indicating that the estimation is stopped is set, it may be implicitly indicated that it is necessary to provide information regarding the moving speed after the handover.

  The mobile station apparatus 1 according to the present embodiment moves according to an instruction from the base station apparatus 2 after the handover when the handover is performed to an area where the reliability of the estimation result of the moving speed determined by the mobile station apparatus 1 is expected to be low. Speed estimation can be stopped. In addition, when handover is performed to an area where the reliability of the estimation result of the moving speed determined by the mobile station apparatus 1 is expected to be high, estimation of the moving speed may be started according to an instruction from the base station apparatus 2 after the handover. it can. Further, the mobile station apparatus 1 can notify the base station apparatus 2 of the estimation result of the current moving speed of the local station apparatus after the handover. In addition, the base station apparatus 2 can be provided with information on the estimation of the movement speed currently held after the handover so that the base station apparatus 2 can estimate the movement speed of the mobile station apparatus 1.

  In addition, the base station device 2 of the present embodiment allows the mobile station device 1 to perform handover after the handover in an area where the reliability of the estimation result of the moving speed determined by the mobile station device 1 is expected to be low. The estimation of the moving speed to be performed can be stopped. Further, when handover is performed to an area where the reliability of the estimation result of the movement speed determined by the mobile station apparatus 1 is expected to be high, estimation of the movement speed performed by the mobile station apparatus 1 after the handover can be started. . That is, it is possible to explicitly switch ON / OFF the estimation of the moving speed of the mobile station apparatus 1 after the handover.

  Further, the base station apparatus 2 provides the mobile station apparatus 1 with the estimation of the movement speed of the mobile station apparatus 1 by having the mobile station apparatus 1 provide information related to the estimation of the movement speed currently held after the handover. Can be done instead. Further, the base station apparatus 2 can instruct the estimated result of the moving speed of the mobile station apparatus 1 to the mobile station apparatus 1 and update the moving speed (mobility state) of the mobile station apparatus 1 after the handover. it can.

  As described above, according to the second embodiment, the mobile station apparatus 1 is instructed to start or stop the processing related to the estimation of the moving speed for moving speed management from the base station apparatus 2 after the handover. It is no longer necessary to determine the mobility state. In addition, the base station apparatus 2 can estimate the moving speed more accurately by having the mobile station apparatus 1 provide information on the moving speed estimation after the handover. As a result, the mobile station apparatus 1 and the base station apparatus 2 of this communication system can reduce power consumption and improve the utilization efficiency of radio resources while efficiently managing the moving speed.

  (A) The present invention can also take the following forms. That is, the mobile station apparatus in the embodiment of the present invention is a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, and estimates a state relating to the moving speed of the mobile station apparatus, and a state relating to the moving speed. Is transmitted to the base station apparatus, and estimation of the state regarding the moving speed is started or stopped based on the notification from the base station apparatus.

  (B) Further, when estimation of the state relating to the moving speed is stopped, the mobile station device transmits information on the state relating to the moving speed to the base station device.

  (C) Moreover, the state information regarding the moving speed transmitted to the base station apparatus of the mobile station apparatus indicates the state of the moving speed estimated by the mobile station apparatus.

  (D) Moreover, the movement speed state of the mobile station apparatus is classified into a normal mobility state, an intermediate mobility state, and a high-speed mobility state.

  (E) Moreover, the state information regarding the moving speed transmitted to the base station device of the mobile station device is cell information and time information on which the mobile station device has moved.

  (F) When the mobile station apparatus stops estimating the state relating to the moving speed based on the notification from the base station apparatus, the mobile station apparatus resets the information used for estimating the moving speed that is held.

  (G) Further, the mobile station apparatus transmits information on the state relating to the moving speed to the base station apparatus, updates the state relating to the moving speed of the mobile station apparatus notified from the base station apparatus, and moves the updated mobile station apparatus. Evaluate event conditions based on speed-related conditions.

  (H) Moreover, the base station apparatus in the embodiment of the present invention is a base station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, and relates to the moving speed of the mobile station apparatus with respect to the mobile station apparatus. Instructs the transmission of the state information and notifies the start or stop of the state estimation regarding the moving speed.

  (I) Further, the base station apparatus instructs the base station apparatus to transmit state information related to the moving speed by instructing the stop of the state estimation related to the moving speed of the mobile station apparatus.

  (J) Moreover, the base station apparatus estimates the state regarding the moving speed of the mobile station apparatus based on the state information regarding the moving speed.

  (K) The base station apparatus updates the state related to the moving speed of the mobile station apparatus by notifying the mobile station apparatus of the estimated state related to the moving speed of the mobile station apparatus.

  (L) Moreover, the communication system in the embodiment of the present invention is a communication system including a mobile station apparatus and a base station apparatus, and the base station apparatus relates to the moving speed of the mobile station apparatus with respect to the mobile station apparatus. Instructing the transmission of the state information, the mobile station apparatus transmits the state information regarding the moving speed to the base station apparatus, and starts or stops the estimation of the state regarding the moving speed based on the notification from the base station apparatus.

  (M) Moreover, the communication system in the embodiment of the present invention is a communication system including a mobile station apparatus and a base station apparatus, and the base station apparatus relates to the moving speed of the mobile station apparatus with respect to the mobile station apparatus. Instructs the transmission of the state information, estimates the state related to the moving speed of the mobile station device based on the state information related to the moving speed, notifies the mobile station device of the estimated state related to the moving speed of the mobile station device, and The apparatus transmits state information related to the moving speed to the base station apparatus, updates the state related to the moving speed of the mobile station apparatus notified from the base station apparatus, and performs an event based on the updated state related to the moving speed of the mobile station apparatus. Evaluate the condition.

  (N) A communication method according to an embodiment of the present invention is a communication method for a mobile station apparatus in a communication system including a mobile station apparatus and a base station apparatus, and estimates a state related to the moving speed of the mobile station apparatus. And a step of transmitting state information related to the moving speed to the base station device, and a step of starting or stopping estimation of the state related to the moving speed based on a notification from the base station device.

  (O) A communication method according to an embodiment of the present invention is a communication method of a mobile station apparatus in a communication system including a mobile station apparatus and a base station apparatus, and information on a state related to a moving speed is transmitted to the base station apparatus. A step of transmitting, a step of updating a state relating to the moving speed of the mobile station device notified from the base station device, and a step of evaluating an event condition based on the updated state relating to the moving speed of the mobile station device.

  (P) A communication method in an embodiment of the present invention is a communication method of a communication system composed of a mobile station apparatus and a base station apparatus, and the base station apparatus transmits a mobile station apparatus to a mobile station apparatus. The mobile station apparatus includes a step of instructing transmission of state information regarding the moving speed, the mobile station apparatus transmitting state information regarding the moving speed to the base station apparatus, and a state of the state regarding the moving speed based on a notification from the base station apparatus. Starting or stopping the estimation.

  (Q) In addition, the communication method in the embodiment of the present invention is a communication method of a communication system including a mobile station device and a base station device, and the base station device A step of instructing transmission of state information relating to the moving speed; a step of estimating a state relating to the moving speed of the mobile station apparatus based on the state information relating to moving speed; and a state relating to the estimated moving speed of the mobile station apparatus A step of notifying the apparatus, wherein the mobile station apparatus transmits information on a state relating to the moving speed to the base station apparatus, and a step of updating the state relating to the moving speed of the mobile station apparatus notified from the base station apparatus. And evaluating the event condition based on the updated state relating to the moving speed of the mobile station device.

  (R) Moreover, the integrated circuit in the embodiment of the present invention is an integrated circuit mounted on a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus, and is related to the moving speed of the mobile station apparatus. , A function for transmitting information on the state relating to the moving speed to the base station apparatus, and a function for starting or stopping the state estimation relating to the moving speed based on a notification from the base station apparatus.

  (S) An integrated circuit according to an embodiment of the present invention is an integrated circuit mounted on a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus. A function to transmit to the station device, a function to update the state related to the moving speed of the mobile station device notified from the base station device, a function to evaluate the event condition based on the updated state related to the moving speed of the mobile station device, Have

  (T) An integrated circuit according to an embodiment of the present invention is an integrated circuit mounted on a base station apparatus in a communication system including a mobile station apparatus and a base station apparatus, and the mobile station apparatus A function of instructing transmission of state information relating to the moving speed of the apparatus, and a function of notifying start or stop of estimation of the state relating to the moving speed.

  The embodiment described above is merely an example, and can be realized using various modifications and replacement examples. For example, this uplink transmission scheme can be applied to both communication systems of the FDD (frequency division duplex) scheme and the TDD (time division duplex) scheme. In addition, as the downlink measurement value, path loss or other measurement values (SIR, SINR, RSRP, RSRQ, RSSI, BLER) may be used instead, or a combination of these measurement values may be used. Is also possible. Further, the names of the parameters shown in the embodiments are called for convenience of explanation, and even if the parameter names actually applied and the parameter names of the embodiments of the present invention are different, the present invention It does not affect the gist of the invention claimed in the embodiment.

  Further, the mobile station apparatus 1 is not limited to a moving terminal, and the embodiment of the present invention may be realized by mounting the function of the mobile station apparatus 1 on a fixed terminal. The mobile station apparatus is also referred to as a user terminal, a terminal apparatus, a communication terminal, a mobile device, a mobile station, a UE (User Equipment), and an MS (Mobile Station). The base station apparatus is also referred to as a radio base station apparatus, a base station, a radio base station, a fixed station, an NB (Node-B), an eNB (evolved Node-B), a BTS (Base Transceiver Station), and a BS (Base Station). .

  Further, for convenience of explanation, the mobile station device 1 and the base station device 2 of the embodiment have been described using functional block diagrams. However, the functions of each part of the mobile station device 1 and the base station device 2 or one of these functions The steps of the method or algorithm for realizing the part may be directly embodied by hardware, software module executed by a processor, or a combination of the two. If implemented by software, the functions may be maintained or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes both communication media and computer recording media including media that facilitate carrying a computer program from one place to another.

  Then, one or more instructions or codes are recorded on a computer-readable recording medium, and one or more instructions or codes recorded on the recording medium are read into a computer system and executed, thereby executing the mobile station apparatus 1 or The base station apparatus 2 may be controlled. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The operations described in the embodiments of the present invention may be realized by a program. A program that operates in the mobile station apparatus 1 and the base station apparatus 2 according to each embodiment of the present invention is a program (computer) that controls the CPU and the like so as to realize the functions of the above-described embodiments according to the respective embodiments of the present invention. Is a program that functions). Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. In addition, by executing the program, not only the functions of the above-described embodiment are realized, but also by processing in cooperation with an operating system or other application programs based on the instructions of the program, The functions of the embodiments may be realized.

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

  Further, the program may be for realizing a part of the above-described functions, and further, may be realized by combining the above-described functions with a program already recorded in a computer system. good.

  In addition, each functional block or various features of the mobile station apparatus 1 and the base station apparatus 2 used in each of the above embodiments includes a general-purpose processor, a digital signal designed to execute the functions described in this specification. Implemented by a processor (DSP), application specific integrated circuit (ASIC), field programmable gate array signal (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or combinations thereof Or it can be implemented. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.

  The processor may also be implemented as a combination of computing devices. For example, a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors connected to a DSP core, or a combination of other such configurations.

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

DESCRIPTION OF SYMBOLS 1 ... Mobile station apparatus 2 ... Base station apparatus 101, 201 ... Reception part 102, 202 ... Demodulation part 103, 203 ... Decoding part 104 ... Measurement processing part 105, 204 ... Control part 106 ... Uplink buffer control part 107, 205 ... Encoding unit 108, 206 ... Modulation unit 109, 207 ... Transmission unit 110 ... Uplink radio resource request control unit 111 ... Random access control unit 112, 208 ... Upper layer 209 ... Network signal transmission / reception unit

Claims (20)

A mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus,
Estimating a state relating to the moving speed of the mobile station apparatus, transmitting information on the state relating to the moving speed to the base station apparatus, and starting or stopping estimating a state relating to the moving speed based on a notification from the base station apparatus A mobile station apparatus characterized by:   The mobile station apparatus according to claim 1, wherein when the estimation of the state related to the moving speed is stopped, information on the state related to the moving speed is transmitted to the base station apparatus.   The mobile station apparatus according to claim 1, wherein the state information relating to the moving speed transmitted to the base station apparatus indicates a moving speed state estimated by the mobile station apparatus.   The mobile station apparatus according to claim 3, wherein the state of the moving speed is classified into a normal mobility state, an intermediate mobility state, and a high-speed mobility state.   The mobile station apparatus according to claim 1, wherein the state information related to the moving speed transmitted to the base station apparatus is cell information and time information on which the mobile station apparatus has moved.   The mobile station apparatus according to claim 1, wherein when the estimation of the state related to the moving speed is stopped based on the notification from the base station apparatus, the information used for estimating the moving speed is reset. A mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus,
Information on the state relating to the moving speed is transmitted to the base station apparatus, the state relating to the moving speed of the mobile station apparatus notified from the base station apparatus is updated, and based on the updated state relating to the moving speed of the mobile station apparatus And evaluating the event conditions. A base station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus,
A base station apparatus, instructing the mobile station apparatus to transmit state information relating to a moving speed of the mobile station apparatus, and notifying start or stop of estimation of a state relating to the moving speed.   9. The base station apparatus according to claim 8, wherein the base station apparatus transmits information on the state relating to the moving speed to the base station apparatus by instructing the mobile station apparatus to stop estimating the state relating to the moving speed.   The base station apparatus according to claim 8, wherein a state relating to a moving speed of the mobile station apparatus is estimated based on information on a state relating to the moving speed.   The base station apparatus according to claim 10, wherein the state related to the moving speed of the mobile station apparatus is updated by notifying the mobile station apparatus of the estimated state related to the moving speed of the mobile station apparatus. A communication system composed of a mobile station device and a base station device,
The base station device
Instructing the mobile station device to transmit information on the state relating to the moving speed of the mobile station device,
The mobile station device
A communication system, wherein information on a state relating to the moving speed is transmitted to the base station apparatus, and estimation of the state relating to the moving speed is started or stopped based on a notification from the base station apparatus. A communication system composed of a mobile station device and a base station device,
The base station device
The mobile station apparatus is instructed to transmit state information related to the moving speed of the mobile station apparatus, the state related to the moving speed of the mobile station apparatus is estimated based on the state information related to the moving speed, and the estimated Notifying the mobile station device of the state related to the moving speed of the mobile station device,
The mobile station device
Information on the state relating to the moving speed is transmitted to the base station apparatus, the state relating to the moving speed of the mobile station apparatus notified from the base station apparatus is updated, and based on the updated state relating to the moving speed of the mobile station apparatus And evaluating the event condition. A communication method of a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus,
Estimating the state relating to the moving speed of the mobile station device, transmitting the state information relating to the moving speed to the base station device, and estimating the state relating to the moving speed based on a notification from the base station device. Starting or stopping the communication method. A communication method of a mobile station apparatus in a communication system composed of a mobile station apparatus and a base station apparatus,
Transmitting information on the state relating to the moving speed to the base station device, updating the state relating to the moving speed of the mobile station device notified from the base station device, and the updated moving speed of the mobile station device Evaluating the event condition based on the state regarding the communication method. A communication method of a communication system composed of a mobile station device and a base station device,
The base station device
Instructing the mobile station device to transmit state information relating to the moving speed of the mobile station device,
The mobile station device
A communication method comprising: transmitting state information related to the moving speed to the base station apparatus; and starting or stopping estimation of the state related to the moving speed based on a notification from the base station apparatus. . A communication method of a communication system composed of a mobile station device and a base station device,
The base station device
Instructing the mobile station device to transmit state information relating to the moving speed of the mobile station device; estimating a state relating to the moving speed of the mobile station device based on information relating to the state relating to the moving speed; And notifying the mobile station apparatus of the estimated state related to the moving speed of the mobile station apparatus,
The mobile station device
Transmitting information on the state relating to the moving speed to the base station device, updating the state relating to the moving speed of the mobile station device notified from the base station device, and the updated moving speed of the mobile station device Evaluating the event condition based on the state regarding the communication method. An integrated circuit mounted on a mobile station device in a communication system composed of a mobile station device and a base station device,
A function for estimating a state relating to the moving speed of the mobile station apparatus, a function for transmitting information on the state relating to the moving speed to the base station apparatus, and an estimation of a state relating to the moving speed based on a notification from the base station apparatus An integrated circuit having a function of starting or stopping An integrated circuit mounted on a mobile station device in a communication system composed of a mobile station device and a base station device,
A function of transmitting information on a state relating to the moving speed to the base station device, a function of updating a state relating to the moving speed of the mobile station device notified from the base station device, and an updated moving speed of the mobile station device An integrated circuit having a function of evaluating an event condition based on a state related to An integrated circuit mounted on a base station device in a communication system composed of a mobile station device and a base station device,
The mobile station apparatus has a function of instructing transmission of state information related to a moving speed of the mobile station apparatus, and a function of notifying start or stop of state estimation related to the moving speed. Integrated circuit.