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WO2009133764A1 - Dispositif de station de base, dispositif de station mobile, système de communication mobile et procédé de communication mobile - Google Patents

Dispositif de station de base, dispositif de station mobile, système de communication mobile et procédé de communication mobile Download PDF

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Publication number
WO2009133764A1
WO2009133764A1 PCT/JP2009/057378 JP2009057378W WO2009133764A1 WO 2009133764 A1 WO2009133764 A1 WO 2009133764A1 JP 2009057378 W JP2009057378 W JP 2009057378W WO 2009133764 A1 WO2009133764 A1 WO 2009133764A1
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Prior art keywords
station apparatus
mobile station
cell
base station
station device
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English (en)
Japanese (ja)
Inventor
秀和 坪井
克成 上村
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to a base station device, a mobile station device, a mobile communication system, and a mobile communication method.
  • EUTRA Evolved Universal Terrestrial Radio Access
  • 3GPP 3rd Generation Partnership Project
  • EUTRA aims to increase the communication speed by introducing a part of technology that has been studied for the fourth generation in the third generation frequency band.
  • EUTRA uses an OFDMA (Orthogonal Frequency Division Multiplexing Access) system as a communication system.
  • OFDMA is a communication system that is resistant to multipath interference and suitable for high-speed transmission. Further, with respect to higher layer operations such as data transfer control and resource management control related to EUTRA, low delay and low overhead are realized, and the simplest possible technique is used.
  • the mobile station device In the cellular mobile communication system, the mobile station device needs to be wirelessly synchronized with the base station device in advance in the cell or sector. For this reason, the base station apparatus transmits a synchronization channel (SCH) having a predetermined configuration to the mobile station apparatus. The mobile station apparatus synchronizes with the base station apparatus by detecting the synchronization channel transmitted from the base station apparatus.
  • SCH synchronization channel
  • the cell or sector is a communication area of the base station device.
  • a primary synchronization channel (P-SCH: Primary SCH) and a secondary synchronization channel (S-SCH: Secondary SCH) are used as synchronization channels.
  • Each cell (or sector) is identified from the mobile station apparatus by a cell ID determined from signals of the primary synchronization channel and the secondary synchronization channel.
  • FIG. 19 is a flowchart showing a cell search procedure of the mobile station apparatus in EUTRA.
  • the mobile station apparatus performs P-SCH identification processing for correlating the replica signal of the primary synchronization channel (P-SCH) with the received signal (step S1a). Thereby, the mobile station apparatus acquires slot timing (step S1b). Then, the mobile station apparatus performs an S-SCH identification process that correlates the replica signal of the secondary synchronization channel (S-SCH) with the received signal (step S2a). Thereby, the mobile station apparatus acquires the frame timing from the obtained transmission pattern of the secondary synchronization channel, and also acquires a cell ID (Identification: identification information) for identifying the base station apparatus (step S2b).
  • Such a series of control that is, processing until the mobile station apparatus is wirelessly synchronized with the base station apparatus and further acquires the cell ID of the base station apparatus is referred to as a cell search procedure.
  • a mobile station apparatus communicates with a base station apparatus in a cell (or sector) that is a communication area of the base station apparatus.
  • a serving cell a cell in which the mobile station apparatus is located.
  • a cell located in the vicinity of the serving cell is referred to as a neighboring cell.
  • the cell IDs of those base station devices may be used for description.
  • the mobile station apparatus determines a cell with good quality by measuring and comparing the reception quality of the serving cell and the neighboring cell.
  • information on one or a plurality of neighboring cells notified from the serving cell is referred to as an adjacent cell list.
  • EUTRA normally, detailed information such as cell IDs and service contents of neighboring cells is not notified from the base station apparatus to the mobile station apparatus.
  • a mobile station apparatus moves from a serving cell to a neighboring cell and changes a cell to be wirelessly connected, it is called handover.
  • a signal used for the mobile station apparatus to determine the level of reception quality between cells is referred to as a downlink reference signal.
  • the downlink reference signal is a predetermined signal sequence corresponding to the cell ID. That is, by identifying the cell ID, it is possible to uniquely specify the downlink reference signal transmitted simultaneously in the corresponding cell (Non-Patent Document 1).
  • FIG. 20 is a diagram illustrating an example of a configuration of a radio frame in EUTRA.
  • the horizontal axis represents the time axis
  • the vertical axis represents the frequency axis.
  • the radio frame is configured with the region Z as a unit (Non-Patent Document 1).
  • the region Z is composed of a constant frequency region (BR) composed of a set of a plurality of subcarriers in the frequency axis direction and a constant transmission time interval (slot).
  • BR constant frequency region
  • slot constant transmission time interval
  • a transmission time interval composed of an integral multiple of one slot is called a subframe. Furthermore, a group of a plurality of subframes is called a frame. In FIG. 20, one subframe is composed of two slots. The region Z divided by this fixed frequency region (BR) by one slot length is called a resource block. One frame is composed of 10 subframes. BW in FIG. 20 indicates the system bandwidth, and BR indicates the bandwidth of the resource block.
  • FIG. 21 is a sequence diagram illustrating an example of a handover procedure.
  • the process shown in FIG. 21 shows control for starting a state in which the mobile station apparatus is communicating with a handover source cell (also referred to as a source cell) and performing a handover to a handover destination cell (also referred to as an adjacent cell). Yes.
  • a handover source cell also referred to as a source cell
  • a handover destination cell also referred to as an adjacent cell.
  • the cell ID of the source cell is CID_A.
  • the cell ID of the adjacent cell is CID_B.
  • the procedure will be described using the cell ID.
  • the mobile station apparatus receives the downlink reference signals of the source cell (CID_A) and the adjacent cell (CID_B), respectively (steps S001 and S002). Then, the mobile station apparatus performs measurement report processing for measuring the reception quality obtained from each downlink reference signal (step S003).
  • the mobile station apparatus notifies the measurement result in the measurement report process to the source cell (CID_A) as a measurement report message (step S004).
  • the source cell (CID_A) transmits a handover request message from the source cell (CID_A) to the neighboring cell (CID_B) when it is determined from the content of the measurement report message that a handover to the neighboring cell (CID_B) is necessary. (Step S005). Accordingly, the source cell (CID_A) notifies the neighboring cell (CID_B) of the necessity for handover of the mobile station apparatus, and requests preparation for handover.
  • the neighbor cell (CID_B) that has received the handover request message notifies the source cell (CID_A) of a handover request permission message when it is determined that the handover can be performed (step S006).
  • the source cell (CID_A) that has received the handover request permission message transmits a handover instruction message (also referred to as a handover command) to the mobile station apparatus (step S007).
  • the handover process is started.
  • the mobile station apparatus executes the handover when the handover execution time is reached.
  • the immediate execution of the handover is specified as the handover instruction message.
  • the mobile station apparatus switches the radio frequency specified by the handover instruction message and the control parameter of the transmission / reception circuit when the handover execution time comes. Then, the mobile station apparatus performs downlink synchronization establishment processing for establishing downlink radio synchronization with the adjacent cell (CID_B), and executes handover processing (step S008).
  • the control parameter for downlink synchronization establishment processing is included in the previous handover instruction message, or is notified or notified from the source cell (CID_A) to the mobile station apparatus in advance.
  • the mobile station apparatus that has completed downlink synchronization establishment performs random access transmission in order to establish uplink synchronization with the neighboring cell (CID_B) (step S009). This process may be referred to as handover access.
  • Non-patent document 2 a preamble sequence (Dedicated Preamble) is assigned to each mobile station apparatus in advance using a handover instruction message.
  • the mobile station apparatus performs random access transmission using the preamble sequence specified by the handover instruction message.
  • the base station apparatus of the adjacent cell (CID_B) that has received the preamble sequence determines that the mobile station apparatus has completed handover.
  • the base station apparatus of the adjacent cell moves the uplink resource allocation information for transmitting the uplink synchronization information for adjusting the uplink transmission timing and the handover completion message (also referred to as a handover confirm).
  • the station apparatus is notified (step S010).
  • the mobile station apparatus adjusts the uplink transmission timing based on the information received in step S010. Then, the mobile station apparatus transmits a handover completion message to the neighboring cell (CID_B) using the designated uplink resource (step S011). Thereby, the mobile station apparatus completes the handover from the source cell (CID_A) to the neighboring cell (CID_B).
  • the handover is performed when the mobile station device is communicating with the serving cell (active state). On the other hand, when the serving cell and the mobile station apparatus are not communicating (idle state), the following cell reselection is performed instead of handover.
  • the mobile station apparatus detects a neighboring cell when the reception quality of the source cell (CID_A) satisfies a condition such as being lower than a predetermined threshold. And a mobile station apparatus acquires the information of the said cell from the alerting
  • Non-Patent Document 1 a downlink reference signal is described as a downlink reference signal (Reference signal) or a downlink reference signal (DL-RS: Downlink Reference signal), but the meaning is the same.
  • Reference signal a downlink reference signal
  • DL-RS Downlink Reference signal
  • a cell also referred to as an MBMS-dedicated cell or dMBMS cell
  • MBMS Multicast Broadcast / Multicast Service
  • a method has been proposed in which a cyclic prefix (CP) length is increased so that delayed waves from a plurality of base station apparatuses can be received as signals.
  • CP cyclic prefix
  • Examples of other cells include a mixed cell that performs communication using a shared channel between a base station apparatus and a user, and a unicast cell that does not perform transmission using a multicast channel (Non-patent Document). 2).
  • the mixed cell individual communication with each mobile station apparatus is performed using a downlink and uplink control channel and a downlink and uplink shared channel for transmitting user data and an incoming call signal in addition to the multicast channel. That is, it is possible to receive services such as reception of a multicast service using a multicast channel such as broadcasting for mobile terminals and voice communication and data communication using a shared channel, which is a function as a conventional mobile phone.
  • a multicast channel is not used in a unicast cell. Therefore, when receiving services such as broadcasting for mobile terminals, communication using a shared channel is performed for each mobile station apparatus. For this reason, when the number of mobile station devices that desire reception increases, a large amount of radio resources are consumed.
  • Non-patent Document 3 a synchronization channel (SCH) to acquire MBMS area information.
  • SCH synchronization channel
  • Non-patent Document 3 a shared channel is not used in the dMBMS cell. Therefore, a user who is waiting for a call or a user who is communicating needs to communicate with a unicast cell or a mixed cell while receiving a signal from a dMBMS cell.
  • Non-patent Document 4 it has been proposed to add an offset to the threshold value for performing the reception and the reception quality for reselection determination.
  • Non-Patent Document 4 As a method for increasing the probability that a mobile station apparatus that wants to receive MBMS synchronizes with an optimal cell, a method shown in Non-Patent Document 4 is known. However, since the mobile station apparatus performs MBMS reception, there is a possibility that the mobile station apparatus may synchronize with a cell whose quality of unicast communication is not the best. For this reason, the method of Non-Patent Document 4 has a problem that a large load is applied to the mobile station device and radio resources, and reception characteristics and frequency utilization efficiency are lowered.
  • 3GPP TS Technical Specification 36.211, Physical Channels and Modulation. V8.0.0 (http://www.3gpp.org/ftp/Specs/html-info/36211.html) 3GPP TS36.300 V8.0.0 (2007-3), Overall description; Stage2 (http://www.3gpp.org/ftp/Specs/html-info/36300.htm) Nokia Siemens Networks, Nokia, Huawei, Ericsson, “L1 Support of Dedicated MBSFN Carriers”, R1-080626, 3GPP TSG-RANWG1BinSep14 # Panasonic, “Cell detection and selection information for MBMS”, R2-074851, 3GPP TSG-RAN WG2 Meeting # 51bis, Jeju, Korea, 5-9 November 2007
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a base station apparatus and a mobile station apparatus that can improve reception characteristics and frequency utilization efficiency without imposing a large load on the mobile station apparatus and radio resources. It is to provide a mobile communication system and a mobile communication method.
  • a base station apparatus is a base station apparatus that communicates with a mobile station apparatus, and is provided by the own base station apparatus.
  • An acquisition unit that acquires information on a service that has not been received from an adjacent base station device, and a notification unit that notifies the mobile station device of information acquired by the acquisition unit.
  • the notification unit of the base station apparatus may be configured such that the notification unit has a predetermined number or more of mobile stations in a certain period of information on the service notified from the adjacent base station apparatus.
  • the service information is notified to the mobile station apparatus as broadcast information.
  • a base station apparatus is a base station apparatus that communicates with a mobile station apparatus, and the reception quality and identification signal of a signal of an adjacent base station apparatus notified from the mobile station apparatus And a notification unit that notifies the mobile station apparatus of a handover instruction or service information.
  • a base station apparatus is a base station apparatus that communicates with a mobile station apparatus, and the reception quality of the signal of the base station apparatus transmitted from the mobile station apparatus is a predetermined quality. If the mobile station apparatus exceeds the above, it is regarded as a report for service request, and based on the reception quality of the signal of the adjacent base station apparatus transmitted from the mobile station apparatus, a handover instruction or A notification unit that notifies service information is provided.
  • a base station apparatus is a base station apparatus that communicates with another base station apparatus, and when there is a service information acquisition request from another base station apparatus, A notification unit that notifies service information to the base station apparatus is provided.
  • a mobile station apparatus is a mobile station apparatus that communicates with a base station apparatus, and based on reception quality of an adjacent base station apparatus and a desired service of the mobile station apparatus, A selection unit that selects a base station apparatus with which the mobile station apparatus communicates for each service is provided.
  • the selection unit of the mobile station apparatus selects only base station apparatuses belonging to the same tracking area.
  • a mobile station apparatus is a mobile station apparatus that communicates with a base station apparatus, and includes reception quality information of signals of adjacent base station apparatuses and reception quality from the base station apparatus.
  • a transmission unit is provided that transmits to the base station apparatus an identification signal that identifies whether the report is a report due to a decrease or a report for service request.
  • the said transmission part of the mobile station apparatus by 1 aspect of this invention transmits the identification signal containing the kind of service which a mobile station apparatus desires.
  • the said transmission part of the mobile station apparatus by 1 aspect of this invention transmits the identification signal containing the reception quality of the signal of the connected base station apparatus.
  • the transmission unit of the mobile station apparatus transmits an identification signal including a comparison result between the reception quality of the signal of the connected base station apparatus and a predetermined threshold value.
  • a mobile communication system is a mobile communication system including a mobile station device and a base station device, and the base station device provides services that are not provided by the base station device.
  • An acquisition unit for acquiring information from an adjacent base station device, and a notification unit for notifying the mobile station device of information acquired by the acquisition unit, wherein the mobile station device has a reception quality of an adjacent base station device and
  • a selection unit is provided that selects a base station apparatus with which the mobile station apparatus communicates for each service based on a desired service of the mobile station apparatus.
  • a mobile communication system is a mobile communication system including a mobile station device and a base station device, and the mobile station device has received signal quality of a peripheral base station device and A selection unit that selects a base station device for each service based on the desired service of the own mobile station device is selected for unicast communication without detecting the base station device for unicast communication. To communicate with the base station apparatus.
  • the mobile communication method according to an aspect of the present invention is a mobile communication method using a mobile station apparatus and a base station apparatus, and the base station apparatus provides a service that is not provided by the base station apparatus.
  • the acquisition process of acquiring the information from the adjacent base station apparatus and the notification process of notifying the mobile station apparatus of the information acquired in the acquisition process the mobile station apparatus receives the reception of the adjacent base station apparatus Based on the quality and the desired service of the mobile station apparatus, a selection process for selecting a base station apparatus with which the mobile station apparatus communicates is performed for each service.
  • the base station apparatus mobile station apparatus, mobile communication system, and mobile communication method of the present invention, it is possible to improve reception characteristics and frequency utilization efficiency without imposing a heavy load on the mobile station apparatus and radio resources.
  • FIG. 1 It is a schematic block diagram which shows the structure of the mobile station apparatus 100 by the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the downlink reference signal processing part 107 (FIG. 1) of the mobile station apparatus 100 by the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the base station apparatus 200 by the 1st Embodiment of this invention. It is a figure which shows an example of the cell structure by the 1st Embodiment of this invention. It is a sequence diagram which shows the process of the mobile communication system by the 1st Embodiment of this invention.
  • the physical channel related to each embodiment of the present invention includes a physical broadcast channel, a physical uplink shared channel, a physical downlink shared channel, a physical downlink control channel, a physical uplink control channel, a physical random access channel, a synchronization channel (SCH), and a reference signal.
  • a physical multicast channel PMCH
  • Transport channels include a broadcast channel, an uplink shared channel, a downlink shared channel, a paging channel for sending an incoming call signal, and a multicast channel.
  • a common control channel assigned to the uplink shared channel a dedicated control channel, a dedicated traffic channel, a paging control channel assigned to the paging channel, a broadcast control channel assigned to the broadcast channel and the downlink shared channel, and the downlink shared channel
  • the physical multicast channel has a one-to-one correspondence with the multicast channel of the transport channel. Therefore, in each embodiment of the present invention, it is also simply referred to as a multicast channel.
  • the uplink dedicated traffic channel, downlink dedicated traffic channel, and multicast traffic channel data in the logical channel are classified as traffic data.
  • the downlink common control channel, shared control channel, dedicated control channel, multicast control channel, uplink common control channel, shared control channel signal, and uplink reference signal in the logical channel are classified as higher layer control signals.
  • the physical uplink control channel and physical downlink control channel signals in the physical channel are classified as lower layer control signals.
  • the broadcast control channel signal in the logical channel is classified as broadcast information.
  • the synchronization channel (SCH) and the downlink reference signal are classified as radio signals.
  • the synchronization channel (SCH) is as described above.
  • the broadcast control channel is transmitted from the base station apparatus to the mobile station apparatus for the purpose of reporting control parameters that are commonly used by the mobile station apparatuses in the cell.
  • P-BCH Primary BCH
  • D-BCH Dynamic BCH
  • the primary broadcast channel is determined in advance to be transmitted at a predetermined period in time and frequency. For example, the primary broadcast channel is transmitted on the center subcarrier of subframe # 0.
  • the mobile station apparatus can receive the primary broadcast channel for the cell whose cell ID is identified.
  • the primary broadcast channel is a signal assigned to the broadcast channel of the transport channel, and is a higher layer control signal.
  • the dynamic broadcast channel is traffic data transmitted on the downlink shared channel of the transport channel, and the transmission position can be varied for each cell.
  • the physical multicast channel is a physical channel for sending a multicast control channel and a multicast traffic channel, which are logical channels.
  • the physical multicast channel provides services to a wide area by performing the same MBMS transmission from a plurality of cells. Also, in order to cover a wide area, a guard interval longer than that used when transmitting other physical channels is used when transmitting a physical multicast channel.
  • the downlink reference signal is a pilot signal transmitted with substantially constant power for each cell.
  • the downlink reference signal is a signal that is periodically repeated at a predetermined time interval (for example, one frame).
  • the mobile station apparatus receives the downlink reference signal from the base station apparatus at a predetermined time interval, and uses it to determine the reception quality for each cell. Further, the downlink reference signal is used as a reference signal for demodulation of the physical downlink shared channel and the physical downlink control channel that are transmitted simultaneously with the downlink reference signal.
  • the sequence used for the downlink reference signal can be any sequence as long as it is a sequence that can be uniquely identified for each cell.
  • the present embodiment relates to an idle mobile station apparatus that acquires service information in neighboring cells from a neighboring cell list.
  • FIG. 1 is a schematic block diagram showing a configuration of a mobile station device 100 according to the first embodiment of the present invention.
  • the mobile station apparatus 100 includes a receiving unit 101, a demodulating unit 102, a control unit 103, a control signal processing unit 104, a data processing unit 105, a broadcast information processing unit 106, a downlink reference signal processing unit 107, a coding unit 108, a modulation unit 109, A transmission unit 110, an upper layer 111, and an antenna A1 are provided.
  • the receiving unit 101 receives a signal having a frequency set based on the reception control information output from the control unit 103 and transmitted from the base station apparatus via the antenna A1.
  • the receiving unit 101 performs processing such as down-conversion on the signal output from the antenna A1, and outputs the result to the demodulating unit 102.
  • the demodulator 102 demodulates the signal output from the receiver 101 based on the reception control information output from the controller 103. Then, the demodulation unit 102 classifies the demodulated signals into a physical downlink shared channel, a physical multicast channel, a physical downlink control channel, a physical broadcast channel, and a downlink reference signal.
  • the reception control information includes reception timing, multiplexing method, resource allocation information, and information regarding demodulation for each channel.
  • Each classified channel is output to the data processing unit 105 if it is a physical downlink shared channel or multicast channel, is output to the control signal processing unit 104 if it is a physical downlink control channel, and is broadcast information processing if it is a physical broadcast channel. If it is a downlink reference signal, it is output to the downlink reference signal processing unit 107. Note that in the case of channels other than the channels described above, they are output to other channel processing units, respectively, but the description of this embodiment is not affected, and thus description thereof is omitted.
  • the data processing unit 105 extracts traffic channel data and an upper layer control signal from the physical downlink shared channel and the physical multicast channel output from the demodulation unit 102 and outputs them to the upper layer 111.
  • the control signal processing unit 104 extracts a lower layer control signal from the physical downlink control channel output from the demodulation unit 102 and outputs the lower layer control signal to the upper layer 111.
  • the broadcast information processing unit 106 extracts broadcast information (primary broadcast channel information) from the physical broadcast channel output by the demodulation unit 102 and outputs the broadcast information to the upper layer 111.
  • the downlink reference signal processing unit 107 extracts reference data from the downlink reference signal output from the demodulation unit 102 and outputs the reference data to the upper layer 111. Control information is output from the upper layer 111 to the control unit 103.
  • traffic channel data and common / dedicated control channel data are output to the encoding unit 108 and encoded as a physical uplink shared channel signal.
  • an uplink reference signal and a lower layer control signal are output to the encoding unit 108 and encoded as a physical control channel signal.
  • the control unit 103 outputs the transmission control information to the encoding unit 108, the modulation unit 109, and the transmission unit 110.
  • the transmission control information includes transmission timing and multiplexing method regarding uplink channels, arrangement information of transmission data of each channel, information regarding modulation and transmission power.
  • Each transmission data encoded by the encoding unit 108 based on the transmission control information is output to the modulation unit 109.
  • Modulation section 109 modulates transmission data with an appropriate modulation scheme in accordance with information instructed by control section 103 and outputs the result to transmission section 110.
  • the data modulated by modulation section 109 is output to transmission section 110, and after appropriate power control, is transmitted from antenna A1 to the base station apparatus based on the channel arrangement.
  • control unit 103 (also referred to as a selection unit) of the mobile station apparatus 100 determines whether the mobile station apparatus 100 for each service is based on the reception quality of the adjacent base station apparatus and the desired service of the mobile station apparatus 100. Select a base station apparatus to communicate with. For example, the control unit 103 selects only base station apparatuses that belong to the same tracking area as the mobile station apparatus 100.
  • the transmission unit 110 of the mobile station apparatus 100 determines whether the reception quality information of the signal of the adjacent base station apparatus and a report for requesting service or a report due to a decrease in reception quality from the base station apparatus. And an identification signal for identifying the base station apparatus.
  • the transmission unit 110 transmits an identification signal including the type of service desired by the mobile station device 100 to the base station device, or includes the reception quality of the signal of the base station device to which the mobile station device 100 is wirelessly connected.
  • An identification signal is transmitted to the base station apparatus, or an identification signal including a comparison result between the reception quality of the signal of the base station apparatus to which the mobile station apparatus 100 is wirelessly connected and a predetermined threshold is transmitted to the base station apparatus. .
  • the description is abbreviate
  • the operations of the blocks 101 to 110 of the mobile station apparatus 100 are comprehensively controlled by the upper layer 111.
  • FIG. 2 is a schematic block diagram showing a configuration of the downlink reference signal processing unit 107 (FIG. 1) of the mobile station device 100 according to the first embodiment of the present invention.
  • the downlink reference signal processing unit 107 includes a downlink reference signal extraction unit 1071, a sequence selection unit 1072, a correlation processing unit 1074, and a quality management unit 1075.
  • the reception control information required for the sequence selection unit 1072 includes, for example, frequency bandwidth, reception time information, reception frequency information, cell ID, and the like.
  • the reception time information includes frame information, subframe information, slot information, and the like.
  • the reception frequency information includes a reception resource block number and a subcarrier number.
  • Sequence selection section 1072 selects or generates an appropriate downlink reference signal sequence used for demodulation based on reception control information input from control section 103 (FIG. 1), and uses the signal as a selection signal as a correlation processing section. It outputs to 1074.
  • the downlink reference signal extraction unit 1071 receives the received downlink reference signal.
  • the downlink reference signal extraction unit 1071 rearranges the input downlink reference signals in the order of the signal sequence according to the reception control information, and outputs the result to the correlation processing unit 1074 as an extraction signal.
  • Correlation processing section 1074 performs correlation processing between the selection signal based on the cell ID and the extracted signal, and outputs the correlation signal to quality management section 1075.
  • the quality management unit 1074 measures the reception quality for each cell ID based on the correlation signal, and outputs it as reference data to the upper layer 111 (FIG. 1).
  • reception quality refers to EUTRA Carrier RSSI (Received Signal Strength Indicator), RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Signal), RSRQ (Reference Signal Received Quality). Such as path loss.
  • the quality management unit 1075 measures a quality information indicator (CQI: Channel Quality Indicator) for each of one or more resource blocks or a plurality of subcarriers in the serving cell, and uses it as reference data in the upper layer 111 (FIG. 1). Output.
  • CQI Channel Quality Indicator
  • the operation of the downlink reference signal processing unit 107 uses a method other than the processing method described in FIG. 2 as long as it can extract a downlink reference signal and perform a process capable of outputting reference data indicating reception quality from the extracted signal. May be.
  • FIG. 3 is a schematic block diagram showing the configuration of the base station apparatus 200 according to the first embodiment of the present invention.
  • the base station apparatus 200 includes a reception unit 201, a demodulation unit 202, a control unit 203, a data processing unit 204, a control signal processing unit 205, an encoding unit 206, a modulation unit 207, a transmission unit 209, an upper layer 210, and an antenna A2. Yes.
  • the receiving unit 201 receives a reception signal (a transmission signal from the mobile station device 100 (FIG. 1) or another base station device) via the antenna A2.
  • the control unit 203 outputs reception control information related to data reception control to the reception unit 201, the demodulation unit 202, the data processing unit 204, and the control signal processing unit 205.
  • the upper layer 210 outputs transmission / reception control information based on schedule information predetermined in the communication system to the control unit 203.
  • the reception signal is output from the reception unit 201 to the demodulation unit 202, and is divided into a physical uplink shared channel signal and a physical control channel signal based on reception control information instructed from the control unit 203, and is demodulated. Note that in the case of channels other than the channels described above, they are output to other channel processing units, respectively, but the description of the present embodiment is not affected, and thus description thereof is omitted.
  • Each data demodulated by the demodulation unit 202 is output to the data processing unit 204 if it is a physical uplink shared channel signal, and is output to the control signal processing unit 205 if it is a physical uplink control channel signal.
  • the data processing unit 204 extracts an upper layer control signal and traffic data from the physical uplink shared channel signal output from the demodulation unit 202 and outputs the upper layer control signal and traffic data to the upper layer 210.
  • the control signal processing unit 205 extracts a lower layer control signal from the physical uplink control channel signal output from the demodulation unit 202 and outputs the lower layer control signal to the upper layer 210.
  • the lower layer control signal or the upper layer control signal includes data related to the base station device 200 such as quality information of the base station device 200 measured by the mobile station device 100 (FIG. 1) and cell ID information of neighboring cells ( Peripheral base station device data).
  • the base station apparatus 200 is a dMBMS cell having no uplink, the base station apparatus 200 is not provided with the data processing unit 204 and the control signal processing unit 205 used in the acquisition process of control data and traffic data. Or the operation may be stopped.
  • Upper layer 210 outputs an upper layer control signal, traffic data, a lower layer control signal, and a downlink reference signal to encoding section 206.
  • the higher layer control signal includes a broadcast control channel and a downlink shared control channel.
  • the control unit 203 outputs the transmission control information to the encoding unit 206, the modulation unit 207, and the transmission unit 209.
  • the signal encoded by the encoding unit 206 is output to the modulation unit 207.
  • Modulation section 207 modulates each transmission data with an appropriate modulation scheme in accordance with transmission control information from control section 203 and outputs the result to transmission section 209.
  • the data modulated by the modulation unit 207 is output to the transmission unit 209, and after appropriate power control, based on the channel arrangement, from the antenna A2 to the mobile station apparatus 100 (FIG. 1) at the frequency set by the transmission control information. Sent.
  • the reception unit 201 (also referred to as an acquisition unit) of the base station apparatus 200 acquires information on services not provided by the own base station apparatus 200 from the adjacent base station apparatus.
  • the transmission unit 209 (also referred to as a notification unit) notifies the mobile station apparatus 100 of the information acquired by the reception unit 201 via the antenna A2.
  • the transmission unit 209 uses the service information as broadcast information. May be notified.
  • the transmission unit 209 notifies the mobile station device 100 of a handover instruction or service information based on the reception quality of the signal of the adjacent base station device notified from the mobile station device 100 and the identification signal. You may make it do.
  • the transmission unit 209 notifies the base station apparatus of service information.
  • the description is abbreviate
  • the operations of the receiving unit 201 to the transmitting unit 209 of the base station apparatus 200 are comprehensively controlled by the upper layer 210.
  • FIG. 4 is a diagram illustrating an example of a cell configuration according to the first embodiment of the present invention.
  • Cells A, B, C, and D are cells using the same carrier frequency F1, and only the cell E is a cell using a different carrier frequency F2.
  • Cells A, C, and D are unicast cells and do not provide an MBMS service.
  • Cell B is a mixed cell.
  • Cell E is a dMBMS cell.
  • Cell E may be configured by transmitting a signal from a single base station apparatus, or may be configured by transmitting the same signal from a plurality of base station apparatuses.
  • Cell D in the same area as part of cell E obtains information about dMBMS cell E from cell E and broadcasts it.
  • Cells A, B, C, and D are the same tracking area, and call signals (paging signals) for a certain mobile station apparatus are transmitted at the same timing.
  • the same timing here means the same frame, the same subframe, the same OFDM symbol, and the like.
  • a tracking area refers to an area for transmitting a paging signal to a mobile station apparatus in units of groups in a mobile communication system including a plurality of grouped base station apparatuses.
  • FIG. 5 is a sequence diagram showing processing of the mobile communication system according to the first embodiment of the present invention.
  • FIG. 5 shows cell reselection processing in the mobile station apparatus 100 in the idle state.
  • the mobile station apparatus 100 is in a state before or during the measurement of the reception quality of the serving cell and the neighboring cells.
  • the cell ID of the cell A as the source cell is CID_A.
  • the cell IDs of the adjacent cells B, C, D, and E are CID_B, CID_C, CID_D, and CID_E, respectively.
  • mobile station apparatus 100 receives broadcast information including a neighbor cell list from cell A (step S100).
  • the mobile station device 100 acquires information that the MBMS service is not provided in the cell A based on the broadcast information transmitted from the base station device of the cell A and including the neighboring cell list (step S101). If the presence / absence of the MBMS service is included in the dynamic broadcast channel, the data processor 105 needs to demodulate and acquire the physical downlink shared channel.
  • the mobile station device 100 receives the synchronization channel (SCH) from each of the adjacent cells B, C, and D (steps S102, S103, and S104). Note that the synchronization channel (SCH) is not transmitted from the cell E, which is an adjacent cell, to the mobile station device 100.
  • the mobile station device 100 uses the neighbor cell list for cell reselection regardless of the signal quality of the cell A. Detect cells.
  • the mobile station device 100 performs cell reselection processing according to the reception quality of the cell A as before. . Even if there is a cell that provides MBMS or a cell that holds dMBMS cell information in the neighbor cell list, the reception quality of cell A reaches the quality at which conventional cell reselection should be performed. If it is lowered, the conventional cell reselection process may be performed.
  • the standby time of the mobile station device 100 decreases as the detection processing period is shortened. For example, as the number of detection trials increases, the detection process cycle is lengthened.
  • a signal from cell A is waited until the next detection processing cycle.
  • the downlink reference signal of the cell is received (step S105), and quality measurement is performed using the downlink reference signal.
  • the mobile station apparatus 100 performs reception quality comparison processing using the threshold A and the threshold B (step S106). Then, the mobile station device 100 performs cell reselection processing (step S107).
  • the mobile station device 100 performs a synchronization process with the base station device of the cell B (step S108).
  • Cell B is set as the MBMS source cell (step S109).
  • the mobile station apparatus 100 requests an MBMS parameter from the base station apparatus of the cell B (step S110).
  • the base station apparatus 200 of the cell B permits MBMS service to the mobile station apparatus 100
  • the base station apparatus 200 transmits parameters necessary for reception to the mobile station apparatus 100 (step S111).
  • the mobile station apparatus 100 enters a unicast data standby state with respect to the base station apparatus 200 of the cell B (step S112).
  • the mobile station apparatus 100 performs MBMS reception setting based on the parameter received in step S111 (step S113).
  • Cell A is set as a unicast source cell (step S114).
  • the mobile station apparatus 100 enters a unicast data standby state with respect to the base station apparatus 200 of the cell A (step S115).
  • the mobile station device 100 receives MBMS data from the base station device 200 of the cell B (step S116).
  • the following processes (1) to (3) may be performed.
  • cell reselection of the cell B similar to the conventional one is performed. After the reselection, random access transmission is performed to the base station apparatus 200 of the cell B for MBMS reception.
  • the mobile station apparatus 100 is notified of uplink synchronization information and uplink resource allocation from the cell B base station apparatus. Thereby, the mobile station apparatus 100 and the base station apparatus 200 of the cell B establish synchronization.
  • the mobile station device 100 performs processing necessary for receiving MBMS, such as authentication / billing processing, with the cell B. Then, the mobile station apparatus 100 starts waiting for receiving a unicast signal such as an incoming call signal (paging) and MBMS data reception.
  • a unicast signal such as an incoming call signal (paging) and MBMS data reception.
  • the mobile station device 100 When the reception quality of the cell is equal to or higher than the predetermined threshold A and lower than the predetermined threshold B, the mobile station device 100 performs the above-described synchronization processing on the base station device 200 of the cell B. Thereafter, the mobile station device 100 performs processing necessary for receiving MBMS, such as authentication / billing processing, with the cell B. Then, the mobile station device 100 continues to wait for unicast data from the cell A and starts receiving MBMS data from the cell B. While processing necessary for MBMS reception is being performed, unicast data standby may be performed from the cell B within the same tracking area. As the threshold B, the reception quality of the source cell A may be used.
  • the mobile station apparatus 100 waits for unicast data for a cell with better reception quality.
  • the mobile station device 100 when the measured reception quality exceeds a predetermined threshold, the corresponding cell is selected.
  • the reception quality of a plurality of cells exceeds the threshold value the cell with the best reception quality is selected.
  • MBMS service information is received from the selected cell.
  • the mobile station device 100 is provided with a desired service in the cell or a cell of a different frequency in the same area as the cell (if the selected cell is the cell D, the cell of the different frequency is the cell E). In this case, processing necessary for receiving services such as authentication / billing processing with the cell is performed. Then, the mobile station device 100 starts MBMS reception.
  • MBMS parameter request signal and service permission signal shown in FIG. 5 are unnecessary.
  • a base station device here, cell D
  • dMBMS cell information transmission timing, transmission frequency, transmission bandwidth, etc.
  • the present invention is not limited to this.
  • another cell C is selected using the other threshold C. If the measured reception quality exceeds the threshold C, the corresponding cell is selected. May be. That is, by performing the above-described processing, the mobile station device 100 receives a plurality of services from the same tracking area.
  • the threshold C may be the same value as the thresholds A and B.
  • FIG. 6 is a flowchart showing cell reselection processing of the mobile station device 100 according to the first embodiment of the present invention.
  • the mobile station apparatus 100 starts processing from a state where parameters necessary for selection of the cell A are set and held as unicast standby parameters (a state where the cell A is selected and MBMS reception is not performed).
  • the mobile station device 100 determines whether or not the reception quality of the source cell is equal to or less than the threshold value S (step S600). If it is equal to or less than the threshold value S ("YES" in step S600), it becomes difficult to wait at the source cell, and it is necessary to reselect the cell immediately. Therefore, the mobile station apparatus 100 performs cell reselection using the conventional cell reselection criteria (step S612). When the threshold value S is exceeded (“NO” in step S600), the mobile station device 100 determines whether or not MBMS reception is desired (step S601). If not desired (“NO” in step S601), the process of the flowchart in FIG. 6 ends. If desired (“YES” in step S601), the mobile station device 100 determines whether the MBMS service is being received (step S602).
  • the mobile station device 100 ends the process of the flowchart of FIG. If the MBMS service is not being received (“NO” in step S602), the mobile station device 100 determines whether it is time to perform a neighboring cell search (step S603). If it is not the timing (“NO” in step S603), the mobile station apparatus 100 returns to step S600. When it is the timing of the neighboring cell search (“YES” in step S603), the mobile station device 100 detects neighboring cells based on the information of the neighboring cell list (step S604). Then, the mobile station device 100 determines whether or not there is a cell that performs MBMS in the detected cell (step S605).
  • the mobile station device 100 When there is no cell (“NO” in step S605), the mobile station device 100 changes the measurement period of the neighboring cells (step S609), and returns to step S600.
  • the mobile station device 100 measures the reception quality of the cell (step S606). Then, the mobile station device 100 determines whether or not the reception quality satisfies the predetermined quality A (step S607).
  • the predetermined quality A is not satisfied (“NO” in step S607)
  • the mobile station device 100 changes the measurement period of the neighboring cells (step S609), and returns to step S600.
  • the predetermined quality A is satisfied (“YES” in step S607), the mobile station device 100 determines whether or not the reception quality satisfies the predetermined quality B (step S608).
  • step S607 If the predetermined quality B is not satisfied (“NO” in step S607), the mobile station device 100 does not change the unicast standby parameter, and the mobile station device 100 detects the detected cell as an MBMS reception parameter. Parameters necessary for selection are set and held (step S611), and the process returns to step S600.
  • the quality B is satisfied (“YES” in step S607), the mobile station apparatus 100 sets and holds parameters necessary for selection of the cell as unicast standby parameters and MBMS reception parameters (step S610). The process returns to step S600.
  • step S600 the present invention is not limited to this.
  • the processing from step S604 may be performed. If “NO” is determined in steps S605 and S607, the process of step S612 may be performed instead of step S609.
  • the mobile station device 100 detects and measures neighboring cells depending on the presence or absence of a desired service (for example, MBMS) at the time of idling even when the reception quality of the signal transmitted by the source cell is good. .
  • a desired service for example, MBMS
  • the mobile station device 100 can easily receive provision of a desired service.
  • the probability that the mobile station apparatus 100 can receive a desired service is improved.
  • the present embodiment relates to an active mobile station apparatus that acquires service information in neighboring cells from a neighboring cell list.
  • the mobile station apparatus and base station apparatus used in the present embodiment have basically the same configuration as the mobile station apparatus 100 (FIG. 1) and the base station apparatus 200 (FIG. 2) described in the first embodiment. Things can be used. Therefore, detailed description thereof will be omitted.
  • the cell configuration of FIG. 4 described in the first embodiment is used.
  • FIG. 7 is a sequence diagram showing processing of the mobile communication system according to the second embodiment of the present invention.
  • FIG. 7 shows a handover process in the mobile station device 100 in the active state.
  • the mobile station device 100 is in a state before or during the measurement of the reception quality of the serving cell and the neighboring cells.
  • the mobile station apparatus 100 acquires information that the MBMS service is not provided in the cell A based on the broadcast information transmitted from the cell A (step S200).
  • the mobile station device 100 transmits a detection of a neighboring cell for cell reselection from the cell A. This is performed regardless of the reception quality of the received signal.
  • the mobile station device 100 receives the synchronization channel (SCH) from each of the adjacent cells B, C, and D (steps S201, S202, and S203). Note that the synchronization channel (SCH) is not transmitted from the cell E, which is an adjacent cell, to the mobile station device 100.
  • the mobile station device 100 performs measurement and handover based on the reception quality of the cell A as usual.
  • reception of each cell is performed using the downlink reference signal of the cell providing the detected MBMS or the cell holding the dMBMS cell information (for example, cell B and cell D) (steps S204 and S205).
  • Quality measurement is performed (step S206).
  • the mobile station device 100 notifies the reception quality information as the neighboring cell measurement information to the cell A which is the source cell together with the identification information of those cells (step S208).
  • the reception quality information to be notified may be reception quality information of all detected cells, or may be only information of cells having reception quality exceeding a predetermined threshold.
  • the mobile station apparatus 100 also notifies the cell A of a signal indicating that MBMS reception is desired (step S207).
  • a signal indicating that MBMS reception is desired may be notified as a lower layer control signal at the same time as the measurement result notification, or may be notified in advance through a data channel as an upper (L2 / L3) layer control signal. And it may notify at the time of initial connection as one parameter of information (UE Capability) which shows performance of mobile station apparatus 100.
  • an identification signal for example, 1-bit signaling or cell A reception quality
  • an identification signal may be notified in order to distinguish from the measurement result report according to the conventional handover processing due to the reception quality of the cell A being lowered.
  • the presence / absence of the desired MBMS reception signal may also be used as an identification signal (when the conventional report is made, a signal indicating that the MBMS reception is not desired even if the MBMS reception is desired is notified to the base station apparatus 200).
  • the reception quality of cell A is used as an identification signal will be described.
  • the base station apparatus 200 of the cell A receives the MBMS reception desired signal, the quality information of the neighboring cells, and the reception quality of the cell A from the mobile station apparatus 100.
  • the base station device 200 of the cell A Indicates a handover to a cell with the best reception quality (eg, cell D) within the cell. Since the handover process is the same as the conventional process, a description thereof is omitted here.
  • the base station apparatus 200 of the cell A requests MBMS information from the base station apparatus of the cell D (Ste S209).
  • the base station apparatus in cell D returns MBMS information to the base station apparatus 200 in cell A based on the request (step S210).
  • the base station device 200 of the cell A relates to the cell E to the mobile station device 100 as data addressed to the user instead of broadcast information.
  • Information (cell ID, carrier frequency, band, information necessary for synchronization, etc.) is transmitted (step S211).
  • the mobile station device 100 Based on the received information, the mobile station device 100 performs processing necessary for receiving MBMS such as authentication / billing processing with the cell A. That is, the mobile station device 100 requests the MBMS parameter from the base station device 200 of the cell A (step S212). Then, when allowing the MBMS service to the mobile station apparatus 100, the base station apparatus 200 of the cell A transmits parameters necessary for reception to the mobile station apparatus 100 (step S213).
  • the mobile station device 100 performs MBMS reception setting based on the received parameters (step S214).
  • the mobile station device 100 starts MBMS reception from the cell E (step S215) while continuing unicast communication with the cell A (step S216).
  • the mobile station device 100 performs processing for MBMS reception with the base station device 200 of the cell A. Therefore, in cell A, it is possible to schedule the allocation of unicast communication to mobile station apparatus 100 so as to be out of the MBMS period scheduled for reception notified from mobile station apparatus 100.
  • the MBMS parameter request signal and service permission signal shown in FIG. 7 are unnecessary. In this case, it is necessary to notify the base station apparatus 200 of the cell A of MBMS reception timing instead of the MBMS parameter request signal for scheduling of unicast communication. Further, the reception quality of the cell A may be used as the threshold value B. When there is a neighboring cell that exceeds the threshold A, the mobile station device 100 performs MBMS reception of the neighboring cell. Thereby, the mobile station apparatus 100 can perform the unicast communication with the cell with better reception quality by comparing the reception quality of the neighboring cell and the reception quality of the source cell.
  • cell A When the number of mobile station apparatuses 100 exceeds a predetermined threshold in a cell not broadcasting MBMS information (here, cell A), cell A constantly transmits information related to MBMS, similar to cell D, to the mobile station apparatus. 100 may be notified.
  • reception quality information notified from the mobile station apparatus 100 is information on all the detected cells regardless of the quality, and there is no cell whose reception quality exceeds the threshold A, “reception quality is not satisfied”, “corresponding Information such as “no cell (providing service)” may be returned to the mobile station apparatus 100.
  • the mobile station device 100 can efficiently change the cycle of measuring neighboring cells based on the returned information.
  • FIG. 8 is a flowchart showing MBMS service reception processing of the mobile station device 100 according to the second embodiment of the present invention.
  • the mobile station device 100 determines whether or not the reception quality of the source cell is equal to or less than the threshold value S (step S80). If it is equal to or less than the threshold value S ("YES" in step S80), the mobile station device 100 needs to perform handover as soon as possible because it becomes difficult to wait in the source cell. Therefore, the mobile station device 100 performs a conventional neighbor cell search process and a handover process based on the measurement result (step S86).
  • the mobile station device 100 determines whether or not a cell that desires MBMS reception and a cell performing MBMS is included in the neighboring cell list. Determination is made (step S81). If it is not desired or if the service is not performed in the neighboring cell (“NO” in step S81), the mobile station device 100 ends the process of the flowchart of FIG.
  • the mobile station device 100 determines whether MBMS is being received or whether MBMS information is notified from the source cell ( Step S82). If the service is in progress or MBMS information is notified from the source cell (“YES” in step S82), the process of the flowchart of FIG. 8 is terminated. When the service is not in progress (“NO” in step S82), the mobile station device 100 determines whether it is time to perform a neighboring cell search (step S83). If it is not the timing (“NO” in step S83), the process returns to step S80. If it is the timing of the neighboring cell search (“YES” in step S83), the mobile station device 100 performs detection of neighboring cells and measurement of reception quality (step S84).
  • the mobile station device 100 transmits the measured quality information, the MBMS service reception request signal, and the identification signal to the base station device 200 of the source cell (step S85). Thereafter, the mobile station device 100 determines whether or not the reply from the base station device 200 is a handover instruction (step S88). If it is not a handover instruction (“NO” in step S88), the mobile station apparatus 100 changes the measurement period of the neighboring cells according to the reply contents (“not satisfied with reception quality”, “no corresponding cell”, no reply, etc.). (Step S87), the process returns to Step S80. If it is a handover instruction (“YES” in step S88), the mobile station device 100 executes a handover process (step S89), and returns to the process of step S80 with the cell after the handover as the source cell.
  • a handover instruction (“NO” in step S88)
  • the mobile station apparatus 100 changes the measurement period of the neighboring cells according to the reply contents (“not satisfied with reception quality”, “no corresponding cell”, no reply, etc.).
  • FIG. 9 is a flowchart showing a handover process of the base station apparatus 200 according to the second embodiment of the present invention.
  • base station apparatus 200 receives a report of reception quality of neighboring cells and an MBMS reception request signal from mobile station apparatus 100 (step S900).
  • the MBMS reception request signal may be notified in advance.
  • the base station apparatus 200 determines whether or not the mobile station apparatus 100 has been notified of the MBMS reception request (step S901). When the reception request is not notified (“NO” in step S901), the base station apparatus 200 performs a normal handover process (step S913), and ends the process of the flowchart of FIG.
  • the base station apparatus 200 determines whether or not the mobile station apparatus 100 is reporting due to the quality degradation of the source cell (step S902).
  • the base station apparatus 200 subtracts a known value from the reception quality of the cell that does not perform the MBMS service among the reported neighboring cells (Ste S912).
  • the base station apparatus 200 may add a known value to the reception quality of the cell that is providing the service, including the own cell.
  • the base station apparatus 200 performs a normal handover process using the corrected reception quality (step S913), and ends the process of the flowchart of FIG.
  • the base station apparatus 200 determines whether or not the reception quality of the serving cell among the reported neighboring cells is equal to or higher than a predetermined threshold A. Is determined (step S903).
  • the base station apparatus 200 determines whether or not only the same service as that of the own cell is being performed in the own cell and in the neighboring cell (step S904). That is, when there is a service request from the mobile station apparatus 100 even if the service is being performed in the own cell, it is determined that the request is for another service and whether or not a different service is being performed in the neighboring cell. judge.
  • the neighboring cell is providing only the same service as that of its own cell (“YES” in step S904)
  • the base station apparatus 200 notifies the mobile station apparatus 100 that “no corresponding cell” (step S905), and FIG.
  • the process of the flowchart in FIG. If “NO” in the step S904, the base station apparatus 200 notifies the mobile station apparatus 100 that “the reception quality is not satisfied” (step S906), and ends the process of the flowchart in FIG.
  • the base station apparatus 200 determines whether or not the reception quality of the service-compatible cell is less than the predetermined threshold B. Is determined (step S907). When the threshold value is equal to or greater than B (“NO” in step S907), the base station apparatus 200 determines that there is sufficient quality as a handover target. Then, the base station apparatus 200 instructs the mobile station apparatus 100 to perform handover to the corresponding cell (step S911), and ends the process of the flowchart of FIG.
  • the base station apparatus 200 determines that the quality for performing the handover has not been reached. Then, the base station apparatus 200 requests MBMS information (transmission schedule, target user, etc.) from the service-enabled cell (step S908). The base station apparatus 200 that has received the reply of the request notifies the mobile station apparatus 100 of information such as the MBMS information, transmission frequency, and transmission bandwidth of the corresponding cell. The base station apparatus 200 transmits this notification as an upper layer control signal (step S909). Thereafter, the base station device 200 performs processing (authentication / billing processing, etc.) necessary for MBMS reception with the mobile station device 100 (step S910), and ends the processing of the flowchart of FIG.
  • MBMS information transmission schedule, target user, etc.
  • the base station apparatus 200 has described the case of notifying the mobile station apparatus 100 of “no applicable cell” or “not satisfying reception quality” as a reply, but the present invention is not limited to this. .
  • the mobile station apparatus 100 need not be notified of these pieces of information. That is, steps S904 to S906 in FIG. 9 are not necessary, and the base station apparatus 200 does not send a handover instruction or MBMS information notification to the mobile station apparatus 100 or send a reply to the mobile station apparatus 100.
  • steps S904 to S906 in FIG. 9 are not necessary, and the base station apparatus 200 does not send a handover instruction or MBMS information notification to the mobile station apparatus 100 or send a reply to the mobile station apparatus 100.
  • FIG. 10 is a flowchart showing the handover process in step S911 of FIG.
  • the base station apparatus 200 sorts and lists the service-corresponding cells having the quality equal to or higher than the known threshold value selected in step S907 (FIG. 9) in the order of good quality (step S1501). Then, base station apparatus 200 sets index N to 1 in order to select a cell from the top of the list (step S1502). Then, the base station apparatus 200 makes a handover request to the Nth cell in the list (step S1503). Then, the base station apparatus 200 determines whether or not a handover request permission is returned from the Nth cell within a predetermined time (step S1504).
  • the base station apparatus 200 When handover request permission is returned (“YES” in step S1504), the base station apparatus 200 includes information related to synchronization with the Nth cell in the handover instruction and notifies the mobile station apparatus 100 (step S1004). S1505). When the handover request permission is not returned, the base station apparatus 200 adds 1 to N (step S1506). The base station apparatus 200 determines whether N has exceeded the number of cells on the list (step S1507). When N exceeds the number of cells on the list (“YES” in step S1507), the base station apparatus 200 does not give a handover instruction to the mobile station apparatus 100, and ends the process of the flowchart of FIG. When N does not exceed the number of cells on the list (“NO” in step S1507), the base station apparatus 200 returns to the process of step S1503.
  • FIG. 11 is a flowchart showing the handover process in step S913 of FIG.
  • the base station apparatus 200 determines whether or not the reception quality of the own cell notified from the mobile station apparatus 100 is equal to or lower than a known threshold (step S1601). If not below the threshold value (“NO” in step S1601), the base station apparatus 200 ends the process of the flowchart of FIG. If it is equal to or lower than the threshold (“YES” in step S1601), the base station apparatus 200 sorts the cells reported from the mobile station apparatus 100 in order of good quality and lists them (step S1602). Base station apparatus 200 then sets index N to 1 to select a cell from the top of the list (step S1603).
  • the base station apparatus 200 makes a handover request to the Nth cell in the list (step S1604). Then, the base station apparatus 200 determines whether or not a handover request permission is returned from the Nth cell within a predetermined time (step S1605). When the handover request permission is returned (“YES” in step S1605), the base station apparatus 200 includes information related to synchronization with the Nth cell in the handover instruction and notifies the mobile station apparatus 100 (step S1605). S1606). When the handover request permission is not returned (“NO” in step S1605), the base station apparatus 200 adds 1 to N (step S1607). Then, the base station apparatus 200 determines whether N has exceeded the number of cells on the list (step S1608).
  • step S1608 When N exceeds the number of cells on the list (“YES” in step S1608), the base station apparatus 200 does not issue a handover instruction to the mobile station apparatus 100, and ends the process of the flowchart of FIG. When N does not exceed the number of cells on the list (“NO” in step S1608), the base station apparatus 200 returns to the process of step S1604.
  • the mobile station device 100 is not affected by the reception quality of the signal transmitted by the base station device 200 of the source cell, and receives the provision of the desired service by measuring and reporting the neighboring cells. It becomes easy. Further, the base station apparatus 200 can perform a handover process based on the desire of the mobile station apparatus 100.
  • the probability that the mobile station apparatus 100 can receive a desired service is improved. Further, by notifying the reason why the service is not provided, it is possible to suppress excessive neighboring cell searches in the mobile station device 100. For this reason, power saving of the mobile station apparatus 100 can be achieved.
  • MBMS can be received without performing handover from a cell having good reception quality of unicast communication. For this reason, it is possible to provide an optimal quality service to the mobile station apparatus 100.
  • this embodiment demonstrated the operation
  • the cell reselection process described in the first embodiment is performed for standby for unicast communication while continuing MBMS reception.
  • signaling is performed by notifying the source cell of the MBMS reception request.
  • FIG. 12 is a sequence diagram showing processing of the mobile communication system according to the third embodiment of the present invention.
  • FIG. 12 shows the cell reselection process in the mobile station apparatus 100 in the idle state.
  • the mobile station apparatus 100 is in a state before or during the measurement of the reception quality of the serving cell and the neighboring cells.
  • the neighbor cell list is not provided to the mobile station device 100 from the base station device 200 of the cell A.
  • the mobile station apparatus 100 knows from the broadcast information transmitted by the cell A that the MBMS service is not provided in the cell A (step S301).
  • the mobile station device 100 performs detection of neighboring cells for cell reselection regardless of the signal quality of the cell A. As the detection processing period is shortened, the standby time of the mobile station device 100 decreases as the detection processing period is shortened. For example, as the number of detection trials increases, the detection process cycle is lengthened.
  • the mobile station device 100 receives the synchronization channel (SCH) from each of the adjacent cells B, C, and D (steps S302, S303, and S304). Note that the synchronization channel (SCH) is not transmitted from the cell E, which is an adjacent cell, to the mobile station device 100. Also, the mobile station device 100 receives broadcast information including information on whether or not the MBMS service is provided in each cell from the neighboring cells B, C, and D (step S305, S306, S307).
  • the mobile station device 100 receives broadcast information of the detected cells (for example, cell B, cell C, cell D) (steps S305, S306, S307). Thereby, the mobile station apparatus 100 acquires information as to whether or not each cell provides the MBMS service in its own cell (step S308). The mobile station apparatus 100 determines whether or not there is a cell performing MBMS or a cell having dMBMS cell information. If the corresponding cell is not found, the mobile station device 100 waits for a signal from the cell A until the next detection processing cycle. When a corresponding cell (here, cell B) is found, the mobile station device 100 receives the downlink reference signal of the cell (steps S309 and S310). Then, the mobile station apparatus 100 measures reception quality using the received downlink reference signal. Next, the mobile station apparatus performs reception quality comparison processing using the following threshold A and threshold B (step S311).
  • the mobile station apparatus performs reception quality comparison processing using the following threshold A and threshold B (step S311).
  • cell reselection of the cell B similar to the conventional one is performed. After the reselection, random access transmission is performed to the base station apparatus 200 of the cell B for MBMS reception.
  • the mobile station apparatus 100 is notified of uplink synchronization information and uplink resource allocation from the cell B base station apparatus. Thereby, the mobile station apparatus 100 establishes synchronization with the base station apparatus 200 of the cell B (step S312). After synchronization is established, the mobile station device 100 performs processing necessary for receiving MBMS, such as authentication / billing processing, with the cell B. That is, the mobile station apparatus 100 sets the cell A as a unicast source cell (step S313).
  • the mobile station apparatus 100 sets the cell B as an MBMS source cell (step S314).
  • the mobile station device 100 requests the MBMS parameter from the base station device of the cell B (step S315).
  • the base station apparatus of the cell B permits the service to the mobile station apparatus 100 and transmits parameters necessary for reception to the mobile station apparatus 100 (step S316).
  • the mobile station apparatus 100 waits for unicast data from the base station apparatus of the cell B (step S317).
  • the mobile station apparatus 100 performs MBMS reception setting for receiving provision of the MBMS service from the cell B (step S318).
  • the mobile station apparatus 100 waits for unicast data from the base station apparatus of the cell A (step S319). Then, the mobile station device 100 starts waiting for receiving a unicast signal such as an incoming call signal (paging) and MBMS data reception (step S320).
  • a unicast signal such as an incoming call signal (paging) and MBMS data reception
  • the mobile station device 100 When the reception quality of the cell is equal to or higher than the predetermined threshold A and lower than the predetermined threshold B, the mobile station device 100 performs the above-described synchronization processing on the base station device of the cell B. Then, the mobile station device 100 performs processing necessary for receiving MBMS such as authentication / billing processing with the cell B (steps S315 to S319). Then, the mobile station device 100 starts receiving MBMS data from the cell B while continuing to wait for unicast data from the cell A.
  • standby for unicast signal reception may be performed from cell B in the same tracking area. Further, the reception quality of the source cell A may be used as the threshold value B.
  • the mobile station device 100 receives the MBMS information of the neighboring cell, and compares the reception quality of the neighboring cell with the reception quality of the source cell. Thereby, the mobile station apparatus 100 can perform standby for receiving a unicast signal in a cell with better reception quality.
  • the mobile station device 100 selects a corresponding cell. When a plurality of cells exceed the threshold, the mobile station device 100 selects a cell with the best reception quality.
  • the mobile station apparatus 100 receives MBMS service information from the selected cell. When a desired service is provided in the cell or a cell having a different frequency in the same area as the cell (if the selected cell is the cell D, the cell having a different frequency is the cell E), the mobile station device 100 Processing necessary for receiving a service such as authentication / billing processing with the cell is performed, and MBMS reception is started.
  • the MBMS parameter request signal and service permission signal shown in FIG. 12 are unnecessary.
  • reselection of cells within the same tracking area has been described, but the present invention is not limited to this.
  • another threshold C is used, and if the measured reception quality exceeds the threshold C, the corresponding cell is selected. good.
  • the mobile station device 100 may receive a plurality of services from the same tracking area.
  • the threshold C may be the same value as the thresholds A and B.
  • FIG. 13 is a flowchart showing cell reselection processing of the mobile station device 100 according to the third embodiment of the present invention.
  • the mobile station device 100 determines whether or not the reception quality of the signal received from the source cell is equal to or less than the threshold value S (step S1100). If it is equal to or less than the threshold value S ("YES" in step S1100), it becomes difficult to wait at the source cell, so it is necessary to reselect the cell immediately. Therefore, the mobile station apparatus 100 performs cell reselection based on the conventional cell reselection criteria (step S1112).
  • step S1101 When the threshold value S is exceeded (“NO” in step S1100), it is determined whether or not the mobile station apparatus 100 desires MBMS reception (step S1101). When the MBMS reception is not desired (“NO” in step S1101), the mobile station device 100 ends the process of the flowchart of FIG. When MBMS reception is desired (“YES” in step S1101), the mobile station device 100 determines whether or not an MBMS service is being received (step S1102). If the MBMS service is being received (“YES” in step S1102), the mobile station device 100 ends the process of the flowchart of FIG.
  • the mobile station device 100 determines whether or not it is the measurement cycle (timing) for performing the neighbor cell search (step S1103). If it is not the measurement cycle (“NO” in step S1103), the mobile station apparatus 100 returns to the process of step S1101. If it is the timing of the neighbor cell search (“YES” in step S1103), the mobile station device 100 detects the neighbor cell using the synchronization channel, and acquires broadcast information of the detected cell (step S1104).
  • the mobile station device 100 determines whether there is a cell that performs MBMS in the detected cell (step S1105). When there is no cell for performing MBMS (“NO” in step S1105), the mobile station device 100 changes the measurement period of the neighboring cells (step S1109), and returns to step S1100. When there is a cell in which MBMS is performed (“YES” in step S1105), the mobile station device 100 measures the reception quality of the cell (step S1106). Then, the mobile station device 100 determines whether or not the reception quality satisfies the predetermined quality A (step S1107). When the predetermined quality A is not satisfied (“NO” in step S1107), the mobile station device 100 changes the measurement cycle of the neighboring cells (step S1109), and returns to the process of step S1101.
  • the mobile station device 100 determines whether or not the reception quality satisfies the predetermined quality B (step S1108).
  • the predetermined quality B is not satisfied (“NO” in step S1108), the mobile station device 100 does not change the unicast standby parameter.
  • the mobile station apparatus 100 sets and holds the MBMS reception parameter as a parameter necessary for selection of the detected cell (step S1111), and returns to the process of step S1100.
  • the predetermined quality B is satisfied (“YES” in step S1108), the mobile station apparatus 100 sets and holds parameters necessary for selection of the cell as unicast standby parameters and MBMS reception parameters (step S1110). ), The process returns to step S1100.
  • step S1100 the present invention is not limited to this.
  • the mobile station apparatus 100 desires MBMS reception, and the mobile station apparatus 100 is not receiving MBMS, the process of step S1104 may be performed.
  • the mobile station apparatus 100 may execute the process of step S1112 instead of step S1109.
  • the mobile station device 100 detects and measures neighboring cells according to the presence or absence of a desired service when idle, even when the reception quality of the source cell is good. As a result, the mobile station device 100 can easily receive provision of a desired service. Furthermore, mobile station apparatus 100 can wait for a unicast signal without being affected by cell selection for MBMS reception within the same tracking area. According to this embodiment, even when there is no neighboring cell list, the probability that the mobile station device 100 can receive a desired service is improved.
  • FIG. 4 a fourth embodiment of the present invention
  • This embodiment is a case where the neighbor cell list is not notified from the base station apparatus to the mobile station apparatus in the second embodiment, or limited information not including service contents is notified from the base station apparatus to the mobile station apparatus.
  • the mobile station apparatus and base station apparatus used in this embodiment have basically the same configuration as the mobile station apparatus 100 (FIG. 1) and base station apparatus 200 (FIG. 2) described in the first embodiment. Can be used. Therefore, detailed description thereof will be omitted.
  • the cell configuration of FIG. 4 described in the first embodiment is used.
  • FIG. 14 is a sequence diagram showing processing of the mobile communication system according to the fourth embodiment of the present invention.
  • FIG. 14 shows a handover process in the mobile station device 100 in the active state.
  • the mobile station apparatus 100 is in a state before or during the measurement of the reception quality of the serving cell and the neighboring cells.
  • the mobile station apparatus 100 knows from the broadcast information transmitted by the cell A that MBMS is not provided in the cell A (step S401).
  • the mobile station apparatus 100 performs detection of a neighboring cell for cell reselection to a cell that provides MBMS regardless of the signal quality of the cell A.
  • the mobile station apparatus 100 receives the synchronization channel (SCH) from each of the adjacent cells B, C, and D (steps S402, S403, and S404). Note that the synchronization channel (SCH) is not transmitted from the cell E, which is an adjacent cell, to the mobile station device 100.
  • the mobile station device 100 receives downlink reference signals from neighboring cells B, C, and D (steps S405, S406, and S407).
  • the mobile station apparatus 100 measures the reception quality of each cell using the downlink reference signal of the detected cell (for example, cell B, cell C, cell D) (step S408).
  • the mobile station apparatus 100 notifies the measured reception quality information to the source cell A.
  • the reception quality information to be notified may be the reception quality information of all detected cells, may be only information on cells having a reception quality exceeding a predetermined threshold, or specified by the base station apparatus 200 The quality information of the top N cells may be used.
  • the mobile station apparatus 100 also notifies the cell A of a signal indicating that MBMS reception is desired (step S409).
  • the signal indicating that MBMS reception is desired may be notified as a lower layer control signal simultaneously with the measurement result notification, or may be notified in advance through the data channel as an upper (L2 / L3) layer control signal. Alternatively, it may be notified at the time of initial connection as one parameter of information (UE Capability) indicating the performance of the mobile station apparatus 100.
  • an identification signal for example, 1-bit signaling or cell A reception quality
  • the presence / absence of the desired MBMS reception signal may be used as the identification signal. In the following description, a case where the reception quality of cell A is used as an identification signal will be described.
  • the base station apparatus 200 of the cell A that is the source cell receives the MBMS reception desired signal, the reception quality information of the neighboring cells, and the reception quality of the cell A from the mobile station apparatus 100 (step S410).
  • the base station apparatus 200 determines whether or not there is a neighboring cell that provides the MBMS service among the cells reported from the mobile station apparatus 100. (Step S411).
  • the base station apparatus 200 of the cell A determines whether or not the reception quality of the cell is equal to or higher than a predetermined threshold B.
  • the base station apparatus 200 instructs the mobile station apparatus 100 to perform handover to a cell with the best reception quality (for example, cell D) in the corresponding cell. Since the handover process is the same as the conventional process, a description thereof is omitted here.
  • the base station apparatus 200 of the cell A transmits MBMS information to the base station apparatus of the cell D. Is made (step S412). Based on the request from cell A, the base station apparatus in cell D returns MBMS information to base station apparatus 200 in cell A (step S413).
  • the base station device 200 of the cell A informs the mobile station device 100 of the cell E as data addressed to the user instead of broadcast information. Information about the cell (cell ID, carrier frequency, band, information necessary for synchronization, etc.) is transmitted (step S414).
  • the mobile station device 100 Based on the received information, the mobile station device 100 performs processing necessary for receiving an MBMS such as authentication / billing with the cell A. That is, the mobile station device 100 requests the MBMS parameter from the cell A (step S415). Then, the base station apparatus 200 of the cell A permits the service to the mobile station apparatus 100 and notifies parameters necessary for reception (step S416). Then, the mobile station device 100 performs MBMS reception setting (step S417). The mobile station apparatus 100 starts receiving MBMS from the cell E (step S418) while continuing the unicast communication in the cell A (step S419). In this way, the mobile station device 100 performs processing for MBMS reception with the cell A. Therefore, the cell A can be scheduled to be excluded from the period of the MBMS scheduled to be received notified from the mobile station device 100, for unicast communication assignment to the mobile station device 100.
  • the cell A can be scheduled to be excluded from the period of the MBMS scheduled to be received notified from the mobile station device 100, for uni
  • the mobile station apparatus 100 needs to notify the base station apparatus 200 of the cell A of MBMS reception timing instead of the MBMS parameter request signal.
  • the threshold B the reception quality of the cell A that is the source cell may be used.
  • the mobile station device 100 performs MBMS reception of the neighboring cell. Then, the mobile station device 100 performs unicast communication with a better reception quality based on a comparison between the reception quality of the neighboring cells and the reception quality of the source cell.
  • reception quality information notified from the mobile station apparatus 100 relates to all cells, and there is no cell whose reception quality exceeds the threshold A, “reception quality is not satisfied”, “corresponding (service is performed) cell” Information such as “none” may be returned to the mobile station apparatus 100.
  • the mobile station device 100 can efficiently change the cycle of measuring neighboring cells based on the returned content.
  • FIG. 15 is a flowchart showing MBMS service reception processing of the mobile station device 100 according to the fourth embodiment of the present invention.
  • the mobile station device 100 determines whether or not the reception quality of the source cell is equal to or less than the threshold value S (step S130). If it is equal to or less than the threshold value S (“YES” in step S130), the mobile station device 100 needs to perform handover as soon as possible because it becomes difficult to wait in the source cell. Therefore, the mobile station device 100 performs a conventional neighbor cell search and performs a handover process based on the measurement result (step S136).
  • step S131 When the threshold value S is exceeded (“NO” in step S130), it is determined whether or not the mobile station apparatus 100 desires MBMS reception (step S131). When MBMS reception is not desired (“NO” in step S131), the mobile station device 100 ends the process of the flowchart of FIG. If MBMS reception is desired (“YES” in step S131), the mobile station device 100 determines whether MBMS is being received or whether MBMS information has been notified from the source cell (step S132). When the service is in progress or when MBMS information is notified from the source cell (“YES” in step S132), the mobile station device 100 ends the process of the flowchart of FIG.
  • the mobile station device 100 determines whether or not it is the measurement cycle (timing) for performing the neighboring cell search (step S133). If it is not the measurement cycle (“NO” in step S133), the mobile station device 100 returns to the process of step S130.
  • step S133 If it is the timing of the neighboring cell search (“YES” in step S133), the neighboring cell is detected and the reception quality is measured (step S134). Next, the measured quality information, MBMS service reception request signal, and identification signal are transmitted to the base station apparatus 200 of the source cell (step S135). Thereafter, the mobile station device 100 determines whether or not the reply from the base station device 200 is a handover instruction (step S138). If it is not a handover instruction (“NO” in step S138), the mobile station apparatus 100 changes the measurement cycle of the neighboring cells according to the reply contents (“not satisfied with reception quality”, “no corresponding cell”, no reply, etc.). (Step S137), the process returns to Step S130. If it is a handover instruction (“YES” in step S138), the mobile station device 100 executes a handover process (step S139), sets the cell after the handover as the source cell, and moves to the process of step S130.
  • a handover instruction (“YES” in step S138)
  • FIG. 16 is a flowchart showing a handover process of the base station apparatus 200 according to the fourth embodiment of the present invention.
  • base station apparatus 200 receives a report of reception quality of neighboring cells and an MBMS reception request signal from mobile station apparatus 100 (step S1400). The MBMS reception request signal may be notified in advance.
  • the base station apparatus 200 determines whether or not the mobile station apparatus 100 desires to receive MBMS (step S1401). When the reception of MBMS is not desired (“NO” in step S1401), the base station apparatus 200 performs a normal handover process in step S1413 and ends the process of the flowchart in FIG.
  • the base station apparatus 200 determines whether or not the mobile station apparatus 100 is reporting due to quality degradation of the source cell (step S1402). When there is a report of quality degradation (“YES” in step S1402), the base station apparatus 200 subtracts a known value from the reception quality of a cell that is not performing MBMS service among the reported neighboring cells (step S1402). S1412). Note that the base station apparatus 200 may add a known value to the reception quality of the cell that is serving, including the own cell. The base station apparatus 200 performs a normal handover process using the corrected reception quality (step S1413), and ends the process of the flowchart of FIG. When there is no report of quality degradation ("NO" in step S1402), the base station apparatus 200 determines whether or not the reception quality of the serving cell among the reported neighboring cells is equal to or higher than a predetermined threshold A. Is determined (step S1403).
  • the base station apparatus 200 determines whether or not only the same service as that of the own cell is being performed in the own cell and in the neighboring cell (step S1404). That is, when there is a service request from the mobile station device 100 even though the base station device 200 is in service in its own cell, the base station device 200 determines that it is a request for another service, and a different service in the neighboring cell. It is determined whether or not. When only the same service as that of the own cell is being performed in the neighboring cell (“YES” in step S1404), “no applicable cell” is notified to the mobile station device 100 (step S1405), and the processing of the flowchart of FIG. To do. If “NO” in the step S1404, the base station apparatus 200 notifies the mobile station apparatus 100 that “the reception quality is not satisfied” (step S1406), and ends the process of the flowchart in FIG.
  • the base station apparatus 200 determines whether or not the reception quality of the service-compatible cell is less than a predetermined threshold B (step S1407). If it is equal to or higher than the threshold B (“NO” in step S1407), the base station apparatus 200 determines that there is sufficient quality as a handover target, and instructs the mobile station apparatus 100 to perform handover to the corresponding cell. (Step S1411), the process of the flowchart of FIG.
  • the base station apparatus 200 determines that the quality for performing the handover has not been reached, and sends MBMS information (transmission schedule, target user, etc.) to the service-enabled cell. Is requested (step S1408).
  • the base station apparatus 200 that has received the response of the request notifies the mobile station apparatus 100 of information such as the MBMS information, transmission frequency, and transmission bandwidth of the service-enabled cell (step S1409). This notification is transmitted as an upper layer control signal.
  • the base station device 200 performs processing (authentication / billing processing, etc.) necessary for MBMS reception with the mobile station device 100 (step S1410), and ends the processing of the flowchart of FIG.
  • the base station apparatus 200 described above notifies the mobile station apparatus 100 of “no applicable cell” or “not satisfied with reception quality” as a reply, but is not limited thereto. For example, when changing the neighboring cell measurement period in the mobile station apparatus 100, if not performed based on this information, the base station apparatus 200 may not perform these notifications. That is, the processing of steps S1404 to S1406 in FIG. 16 becomes unnecessary, and the base station apparatus 200 notifies the mobile station apparatus 100 of a handover instruction, MBMS information, or no reply.
  • the mobile station device 100 performs measurement and reporting of neighboring cells without being affected by the reception quality of the source cell. As a result, the mobile station device 100 can easily receive provision of a desired service. Further, the base station apparatus 200 can perform a handover process based on the desire of the mobile station apparatus 100.
  • the probability that the mobile station device 100 can receive a desired service even when there is no neighboring cell list is improved.
  • the mobile station device 100 can receive MBMS without performing handover from a cell with good unicast communication reception quality. And it becomes possible to provide a service with the optimal quality with respect to the mobile station apparatus 100.
  • FIG. Furthermore, the MBMS information in the adjacent cell detected by the mobile station device 100 is transmitted as data addressed to the user, not the broadcast information. As a result, it is possible to suppress waste of resources due to putting all MBMS information provided in the neighboring cells on the broadcast channel. In addition, it is possible to suppress unnecessary neighboring cell searches by users who cannot detect the neighboring cells in the cell.
  • the operation when the mobile station device 100 is active has been described.
  • the present invention is not limited to this.
  • the mobile station device 100 continues the MBMS reception and performs cell resumption described in the first embodiment for standby of the unicast communication.
  • a selection process may be performed.
  • the mobile station apparatus 100 desires an MBMS different from the MBMS performed in the source cell, signaling is performed implicitly by notifying the source cell of the MBMS reception request. ing.
  • the priority at the time of selection of the handover destination in the base station apparatus 200 can be appropriately changed by notifying the type of MBMS by using the MBMS reception desired signal as a plurality of bits.
  • the handover processing is performed after the base station apparatus 200 determines the presence / absence of a service for the neighboring cells for which the mobile station apparatus 100 has performed reception quality measurement.
  • the base station apparatus notifies the mobile station apparatus 100 of cell IDs of neighboring cells to be measured in advance as data addressed to the user. Then, the mobile station apparatus measures only the received quality of the notified neighboring cell and reports it to the base station apparatus.
  • the mobile station apparatus and the base station apparatus used in this embodiment have basically the same configuration as the mobile station apparatus 100 (FIG. 1) and the base station apparatus 200 (FIG. 2) described in the first embodiment. Since those are used, detailed description thereof is omitted. Further, in the present embodiment, the cell configuration of FIG. 4 described in the first embodiment is used.
  • FIG. 17 is a sequence diagram showing processing of the mobile communication system according to the fifth embodiment of the present invention.
  • FIG. 17 shows the handover process in the mobile station device 100 in the active state.
  • the mobile station apparatus 100 is in a state before or during the measurement of the reception quality of the serving cell and the neighboring cells. From cell A, the neighbor cell list is not provided to mobile station apparatus 100.
  • the mobile station apparatus 100 knows that the MBMS service is not provided in the cell A by receiving the broadcast information transmitted from the cell A (step S501).
  • the mobile station apparatus 100 notifies the cell A of a signal indicating that MBMS reception is desired (step S502).
  • This desired signal may be notified as a lower layer control signal simultaneously with the measurement result notification, or may be notified in advance through the data channel as an upper (L2 / L3) layer control signal, You may notify at the time of an initial connection as 1 parameter of the information (UE Capability) which shows the performance of the mobile station apparatus 100.
  • the base station apparatus 200 of the source cell A receives the MBMS reception request signal from the mobile station apparatus 100.
  • the base station apparatus 200 of the cell A has a cell that provides an MBMS service or dMBMS cell information from information on neighboring cells held by itself.
  • the presence / absence of a cell is searched (step S503). If there is no corresponding cell, base station apparatus 200 returns information “no corresponding cell” to mobile station apparatus 100.
  • the notification is preferably transmitted as an upper layer control signal. Alternatively, when there is no reply to the mobile station device 100 within a certain time, “no corresponding cell” may be set.
  • the base station apparatus 200 of the cell A notifies the mobile station apparatus 100 of the ID information and the like of the corresponding cell as measurement target peripheral cell information as a lower layer or higher layer control signal. (Step S504).
  • the mobile station apparatus 100 that has received the measurement target peripheral cell information (for example, the cell B and the cell D) detects the cell B and the cell D using the synchronization channel (SCH) or the downlink reference signal (steps S505 and S506). , S507, S508).
  • the mobile station apparatus 100 measures the reception quality of each cell using the downlink reference signal of the detected cell (for example, cell D) (step S509).
  • the mobile station apparatus 100 notifies the measured reception quality information to the cell A that is the source cell (step S510).
  • the base station apparatus 200 of the cell A compares the reception quality of neighboring cells (step S511).
  • the base station apparatus 200 of the cell A gives the cell with the best reception quality in the cell to the mobile station apparatus 100. Instructs handover to (here, cell D). Since the handover process is the same as the conventional process, a description thereof is omitted here.
  • the base station apparatus 200 of the cell A that is the source cell transmits MBMS information to the base station apparatus of the cell D. Is made (step S512). Based on the request, the base station apparatus of cell D returns MBMS information to the base station apparatus 200 of cell A (step S513).
  • the base station device 200 of the cell A informs the mobile station device 100 of cell E as data addressed to the user instead of broadcast information. Information on the cell (cell ID, carrier frequency, band, information necessary for synchronization, etc.) is transmitted (step S514).
  • the mobile station device 100 Based on the received information, the mobile station device 100 performs processing necessary for receiving an MBMS service such as authentication / billing processing with the base station device 200 of the cell A. That is, the mobile station apparatus 100 requests an MBMS parameter from the base station apparatus 200 of the cell A (step S515).
  • the base station apparatus 200 of the cell A permits the service to the mobile station apparatus 100 and notifies the mobile station apparatus 100 of parameters necessary for reception (step S516).
  • the mobile station apparatus 100 performs MBMS reception setting (step S517).
  • the mobile station apparatus 100 starts receiving MBMS from the cell E (step S518) while continuing the unicast communication in the cell A (step S519).
  • the MBMS parameter request signal and service permission signal shown in FIG. 17 are unnecessary. However, in this case, it is necessary to notify MBMS reception timing to the base station apparatus 200 of the cell A instead of the MBMS parameter request signal for scheduling of unicast communication. In addition, when there is no cell whose reception quality exceeds the threshold A, information such as “No corresponding cell” or “Reception quality is not satisfied” can be returned to the mobile station apparatus 100 as in the fourth embodiment. It is.
  • the mobile station device 100 performs measurement and reporting of neighboring cells without being affected by the reception quality of the signal transmitted by the source cell. As a result, the mobile station device 100 can easily receive provision of a desired service. Further, the base station apparatus 200 can perform a handover process based on the desire of the mobile station apparatus 100.
  • the probability that the mobile station device 100 can receive a desired service is improved. Further, by notifying the mobile station device 100 of the measurement target cell based on the contents of the service request, an efficient neighboring cell search can be performed. Further, as in the fourth embodiment, it is possible to receive MBMS without performing handover from a cell having good reception quality of unicast communication. In addition, it is possible to provide the mobile station apparatus 100 with an optimum quality.
  • the mobile station apparatus and the base station apparatus used in this embodiment have basically the same configuration as the mobile station apparatus 100 (FIG. 1) and the base station apparatus 200 (FIG. 2) described in the first embodiment. Since those are used, detailed description thereof is omitted.
  • FIG. 18 is a sequence diagram showing processing of the mobile communication system according to the sixth embodiment of the present invention.
  • the processing in FIG. 18 differs from the first embodiment in that the mobile station device 100 receives MBMS from the cell E and processing after standby for the last unicast communication.
  • the mobile station apparatus 100 performs reception of MBMS from the cell E and standby for unicast communication.
  • the mobile station device 100 performs random access to the cell A of the unicast source cell. Then, the mobile station apparatus 100 acquires uplink / downlink resource allocation information and uplink transmission timing correction information, and starts unicast communication.
  • the mobile station apparatus 100 receives broadcast information from the base station apparatus 200 of the cell A that is the source cell (step S601). Also, the mobile station device 100 receives broadcast information from the base station devices 200 of the cells B, C, and D that are adjacent cells (steps S605, S606, and S607). The broadcast information includes information about whether or not the MBMS service is provided in the own cell.
  • the mobile station device 100 receives the synchronization channel (SCH) from the adjacent cells B, C, and D (steps S602, S603, and S604). Note that the mobile station device 100 does not receive a synchronization channel (SCH) from the cell E that is an adjacent cell.
  • SCH synchronization channel
  • the mobile station apparatus 100 acquires information on the cell providing the MBMS service (step S608).
  • the mobile station device 100 receives downlink reference signals from the cell B and the cell D (steps S609 and S610).
  • the mobile station apparatus 100 compares the reception quality of the downlink reference signal received in steps S609 and S610 (step S611).
  • a case will be described in which the reception quality of the downlink reference signal of cell D is better than the reception quality of the downlink reference signal of cell B.
  • the mobile station apparatus 100 performs a synchronization process with the base station apparatus 200 of the cell D (step S612). Then, the mobile station device 100 sets the cell A as a unicast source cell (step S613). Moreover, the mobile station apparatus 100 sets the cell E as an MBMS source cell (step S614). Then, the mobile station device 100 requests the cell D to transmit the MBMS parameter (Step S615).
  • the base station apparatus 200 of the cell D permits the mobile station apparatus 100 to provide an MBMS service, and transmits parameters necessary for the mobile station apparatus 100 to receive the MBMS service to the mobile station apparatus 100. (Step S616).
  • the mobile station apparatus 100 sets the cell D to a standby state for unicast data (step S617).
  • the mobile station apparatus 100 performs setting for receiving the MBMS service from the base station apparatus 200 of the cell D based on the parameter received in step S616 (step S618).
  • the mobile station device 100 continues the unicast standby for the cell E and receives MBMS data from the base station device 200 of the cell E (step S619). Thereafter, the mobile station device 100 randomly accesses the cell A (step S620). Then, the mobile station apparatus 100 receives uplink and downlink resource allocation information and uplink timing correction information from the base station apparatus 200 of the cell A (step S621).
  • SCH synchronization channel
  • the cyclic prefix length of the synchronization channel (SCH) should be the same as that of the unicast cell in the situation where the cyclic prefix length needs to be increased in consideration of the delayed wave. Become. As a result, intersymbol interference occurs, which may lead to deterioration of characteristics.
  • the control unit 103 (also referred to as a selection unit) of the mobile station apparatus 100 performs base station apparatus for each service based on the reception quality of the signals of the surrounding base station apparatuses and the desired service of the own mobile station apparatus. Select 200. And it communicates with the base station apparatus 200 selected for unicast communication, without detecting the base station apparatus 200 for unicast communication. For this reason, in this embodiment, it is possible to synchronize with the dMBMS cell without transmitting a synchronization channel (SCH) from the dMBMS cell. Even when a signal used for synchronization processing such as a synchronization channel (SCH) is transmitted from the dMBMS cell, the basic mechanism of this embodiment is not affected. That is, a known signal may be transmitted from the dMBMS cell in order to compensate for the frequency offset after synchronization with the dMBMS cell and to improve the synchronization accuracy.
  • SCH synchronization channel
  • each unit of mobile station apparatus 100 and base station apparatus 200 or a program for realizing a part of these functions may be recorded on a computer-readable recording medium. Then, the mobile station apparatus 100 and the base station apparatus 200 may be controlled by causing the computer system to read and execute the program recorded on the recording medium.
  • the “computer system” here includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, or a hard disk built in a computer system.
  • the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In this case, it also includes 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 client.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
  • the present invention can be applied to a base station apparatus, a mobile station apparatus, a mobile communication system, a mobile communication method, and the like that can improve reception characteristics and frequency use efficiency without imposing a heavy load on the mobile station apparatus and radio resources.
  • DESCRIPTION OF SYMBOLS 100 ... Mobile station apparatus, 101 ... Reception part, 102 ... Demodulation part, 103 ... Control part, 104 ... Control signal processing part, 105 ... Data processing part, 106 ... Broadcast information processing section, 107 ... downlink reference signal processing section, 108 ... coding section, 109 ... modulation section, 110 ... transmission section, 111 ... upper layer, 200 ... base station apparatus , 201 ... receiving unit, 202 ... demodulating unit, 203 ... control unit, 204 ... data processing unit, 205 ... control signal processing unit, 206 ... coding unit, 207 ... Modulation unit, 209 ... transmission unit, 210 ... upper layer, A1 ... antenna, A2 ... antenna

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Abstract

L'invention porte sur un dispositif de station mobile qui communique avec un dispositif de station de base et comprend une unité de sélection pour sélectionner un dispositif de station de base devant communiquer avec le dispositif de station mobile pour chaque service en fonction d'une qualité de réception d'un dispositif de station de base adjacent et d'un service souhaité par le dispositif de station mobile.
PCT/JP2009/057378 2008-04-28 2009-04-10 Dispositif de station de base, dispositif de station mobile, système de communication mobile et procédé de communication mobile Ceased WO2009133764A1 (fr)

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WO2013132920A1 (fr) * 2012-03-05 2013-09-12 ソニー株式会社 Dispositif de commande de communication, procédé de commande de communication et station de base
JPWO2013132920A1 (ja) * 2012-03-05 2015-07-30 ソニー株式会社 通信制御装置、通信制御方法及び基地局
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