WO2009098960A1 - 移動通信システム、基地局装置、移動局装置及び移動通信方法 - Google Patents
移動通信システム、基地局装置、移動局装置及び移動通信方法 Download PDFInfo
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- WO2009098960A1 WO2009098960A1 PCT/JP2009/051182 JP2009051182W WO2009098960A1 WO 2009098960 A1 WO2009098960 A1 WO 2009098960A1 JP 2009051182 W JP2009051182 W JP 2009051182W WO 2009098960 A1 WO2009098960 A1 WO 2009098960A1
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- base station
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- 238000010295 mobile communication Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 139
- 238000012545 processing Methods 0.000 claims abstract description 99
- 238000005259 measurement Methods 0.000 claims abstract description 90
- 238000004891 communication Methods 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims description 61
- 238000007726 management method Methods 0.000 description 28
- 238000010586 diagram Methods 0.000 description 23
- 238000000605 extraction Methods 0.000 description 10
- 230000001360 synchronised effect Effects 0.000 description 8
- 108010076504 Protein Sorting Signals Proteins 0.000 description 6
- 239000000284 extract Substances 0.000 description 6
- 230000010365 information processing Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
- H04W56/007—Open loop measurement
- H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
- H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Definitions
- the present invention relates to a mobile communication system, a base station apparatus, a mobile station apparatus, and a mobile communication method.
- EUTRA Evolved Universal Terrestrial Access
- 3GPP Third Generation Partnership Project
- EUTRA adopts an OFDMA (Orthogonal Frequency Division Multiplexing Access) method as a communication method.
- OFDMA is a communication system that is resistant to multipath interference and suitable for high-speed transmission.
- the detailed specification regarding the operation of the upper layer in EUTRA realizes low delay and low overhead, and further employs the simplest possible technique.
- Higher layer operations include data transfer control and resource management control.
- 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. Therefore, the base station apparatus transmits a synchronization channel (SCH) having a specified configuration to the mobile station apparatus. And a mobile station apparatus synchronizes with a base station apparatus by detecting a synchronous channel (SCH).
- SCH synchronization channel
- a cell or sector is a communication area of a base station apparatus.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- SCH 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 (P-SCH) and the secondary synchronization channel (S-SCH).
- FIG. 16 is a flowchart showing processing of a conventionally known cell search method.
- the mobile station apparatus performs the P-SCH identification process by correlating the replica signal of the primary synchronization channel (P-SCH) with the received signal. Thereby, the mobile station apparatus acquires the slot timing (step S1).
- the mobile station apparatus performs an S-SCH identification process by taking a correlation between the replica signal of the secondary synchronization channel (S-SCH) and the received signal.
- S-SCH secondary synchronization channel
- the mobile station apparatus acquires frame timing based on the obtained transmission pattern of the secondary synchronization channel (S-SCH).
- the mobile station apparatus acquires a cell ID (Identification: identification information) for identifying the base station apparatus (step S2).
- Such a series of controls that is, step control until the mobile station apparatus establishes radio synchronization with the base station apparatus and further specifies the cell ID of the base station apparatus is called 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 When a mobile station apparatus is wirelessly connected to a certain base station apparatus, a cell in which the mobile station apparatus is located is called a serving cell.
- a serving cell On the other hand, a cell located in the vicinity of the serving cell is called a neighboring cell.
- the mobile station apparatus can determine a cell with good quality by measuring and comparing the reception quality of the serving cell and the neighboring cell.
- 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 called 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. 17 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 a unit composed of a constant frequency region (BR) and a region (a region with dot-shaped hatching in FIG. 17) configured with a constant transmission time interval (slot) (non-patent document). Reference 1).
- the frequency region (BR) is a collection of a plurality of subcarriers arranged in the frequency axis direction.
- 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.
- FIG. 17 shows a case where one subframe is composed of two slots. This constant frequency region (BR) and a region divided by one slot length (regions with dot-shaped hatching in FIG. 17) are called resource blocks.
- One frame is composed of 10 subframes.
- BW in FIG. 17 indicates the system bandwidth, and BR indicates the bandwidth of the resource block.
- FIG. 18 is a sequence diagram showing a handover procedure used in EUTRA.
- FIG. 18 shows control in which a mobile station apparatus starts from a state in which it communicates with a handover source cell (hereinafter referred to as a source cell) and performs handover to a handover destination cell (hereinafter referred to as an adjacent cell). Is shown. The following procedure will be described assuming that the cell ID of the source cell is CID_A and the cell ID of the neighboring cell is CID_B.
- the mobile station apparatus receives the downlink reference signals with CID_A and CID_B from the base station apparatus with cell ID CID_A and the base station apparatus with cell ID CID_B (steps S001 and S002). Then, the mobile station apparatus measures the reception quality obtained from each downlink reference signal.
- the mobile station apparatus performs measurement report processing (step S003). That is, the measurement result in the mobile station apparatus is notified as a measurement report message to the base station apparatus whose cell ID is CID_A (step S004). Based on the content of the measurement report message, the base station apparatus with a cell ID of CID_A determines whether a handover to the base station apparatus with a cell ID of CID_B is necessary. When it is determined that the handover is necessary, the necessity of handover to the mobile station apparatus is determined using the handover request message from the base station apparatus having the cell ID of CID_A to the base station apparatus having the cell ID of CID_B.
- the base station apparatus whose ID is CID_B is notified (step S005) and a preparation for handover is requested.
- the base station apparatus having the cell ID of CID_B that has received the handover request message determines that the handover can be performed
- the base station apparatus of the cell ID of CID_A notifies the handover request permission message (step S006).
- the base station apparatus having the cell ID of CID_A that has received the handover request permission message notifies the mobile station apparatus of a handover instruction message (also referred to as a handover command) (step S007).
- the handover process is started (step S008).
- the handover execution message includes the handover execution time
- the mobile station apparatus executes the handover when the handover execution time is reached. Immediate execution may be designated as the handover execution time.
- the mobile station apparatus switches the radio frequency specified by the handover instruction message and the control parameter of the transmission / reception circuit at the handover execution time. Thereafter, the mobile station apparatus performs downlink synchronization establishment processing for establishing downlink radio synchronization with the base station apparatus having a cell ID of CID_B (handover process).
- the control parameter for downlink synchronization establishment processing is included in the previous handover instruction message, or is notified or notified to the mobile station apparatus in advance from the base station apparatus whose cell ID is CID_A.
- the mobile station apparatus that has completed downlink synchronization establishment performs random access transmission in order to establish uplink synchronization with a base station apparatus having a cell ID of CID_B (step S009).
- This process is sometimes called handover access.
- a preamble sequence (Dedicated Preamble) is assigned to each mobile station device in advance in the handover instruction message for random access transmission in which no collision occurs (contention free) (Non-patent Document 2).
- the mobile station apparatus performs random access transmission using the preamble sequence specified in the handover instruction message.
- the base station apparatus having the cell ID of CID_B that has received the preamble sequence determines that the handover of the mobile station apparatus has been completed. Then, the base station apparatus whose cell ID is CID_B moves uplink synchronization information for adjusting uplink transmission timing and uplink resource allocation information for transmitting a handover complete message (sometimes called a handover confirm).
- the station apparatus is notified (step S010).
- the mobile station apparatus adjusts the uplink transmission timing based on the information, transmits a handover complete message to the base station apparatus with the cell ID of CID_B using the specified uplink resource, and completes the handover (step S011).
- the downlink reference signal is described as a downlink reference signal (DL) or DL-RS (Downlink Reference signal), but the meaning is the same.
- FIG. 19 is a sequence diagram showing a handover procedure when the same cell ID is measured by the mobile station apparatus.
- FIG. 19 shows a case where a collision cell having the same cell ID (CID_B) as the adjacent cell in FIG. 18 exists in the same area.
- the mobile station apparatus receives the downlink reference signals of the source cell (CID_A), the neighboring cell (CID_B), and the collision cell (CID_B), respectively (steps S020, S021, and S022). Then, the mobile station apparatus measures the reception quality obtained from each downlink reference signal.
- the mobile station apparatus can detect only two types of cell IDs CID_A and CID_B in the conventional cell search procedure, it cannot be understood that there are two cells having the same cell ID (CID_B). Therefore, the downlink reference signals of the neighboring cell (CID_B) and the collision cell (CID_B) are measured without being distinguished, and the measurement report message is notified to CID_A in the measurement report process (step S023) (step S024). That is, when the adjacent cell (CID_B) and the collision cell (CID_B) are synchronized, the mobile station apparatus measures the combined downlink reference signal. Also, when the adjacent cell (CID_B) and the collision cell (CID_B) are asynchronous, one downlink reference signal is determined as a delayed wave in the mobile station apparatus.
- the source cell (CID_A) does not know whether the reception quality of the cell of CID_B included in the measurement report message from the mobile station apparatus is that of the neighboring cell (CID_B) or the collision cell (CID_B). Further, when the reception quality of the cell of CID_B is reported as a combination of the reception quality of the neighboring cell (CID_B) and the collision cell (CID_B), it is inappropriate to use it as a handover criterion.
- the source cell (CID_A) transmits a handover instruction message to the adjacent cell (CID_B) to the mobile station apparatus, it is impossible to clearly specify that the handover destination cell is the adjacent cell (CID_B). Therefore, there is a possibility that the mobile station apparatus performs handover to the collision cell (CID_B).
- Non-Patent Document 3 discloses a unique ID (Global Cell Identity, hereinafter referred to as GCID) in which a sufficient number of cell IDs for which at least 504 types are prepared in order to solve the problem caused by these same cell IDs. ) Is allocated to all the cells together with the cell ID.
- GCID Global Cell Identity
- a collision cell that cannot be identified only by the cell ID can be identified by the GCID.
- GCID Global Cell Identity
- Non-Patent Document 3 The method using GCID shown in Non-Patent Document 3 is based on the synchronization channel (SCH) and downlink reference signal even if the same cell ID (collision cell) is allocated to at least two cells in the measurement area. It is necessary for the mobile station device to autonomously identify the collision cell. However, it is very difficult for the mobile station apparatus to autonomously detect that the same cell ID is allocated and to receive each radio signal separately. For this reason, when a collision cell exists, there existed a problem that the process at the time of communicating between a mobile station apparatus and a base station apparatus became complicated. 3GPP TS (Technical Specification) 36.211, Physical Channels and Modulation.
- 3GPP TS Technical Specification
- V8.0.0 http://www.3gpp.org/ftp/Specs/html-info/36211.html
- 3GPP TS36.300 Overall description; Stage2.
- V8.3.0 http://www.3gpp.org/ftp/Specs/html-info/36300.htm
- the present invention has been made in view of the above circumstances, and an object thereof is to simplify processing when communication is performed between a mobile station apparatus and a base station apparatus even when a collision cell exists.
- a mobile communication system, a base station apparatus, a mobile station apparatus, and a mobile communication method are provided.
- a mobile communication system is a mobile communication system including a mobile station apparatus and a base station apparatus, and the base station
- the apparatus determines cell identification information of the base station apparatus that transmits the radio signals of the same synchronization channel.
- a cell identification information transmitting unit configured to transmit to the mobile station apparatus, wherein the mobile station apparatus performs a measurement process based on the cell identification information of the base station apparatus, and the measurement result obtained by the measurement process is transmitted to the base station apparatus; The measurement result transmission part which transmits to is provided.
- the cell identification information of the base station apparatus is cell identification information specified by a combination of a primary synchronization channel and a secondary synchronization channel.
- the cell identification information of the base station apparatus is uniquely assigned to each cell, cell identification information specified by a combination of a primary synchronization channel and a secondary synchronization channel Global cell identification information.
- the cell identification information of the base station apparatus is transmitted to the mobile station apparatus using a handover instruction message.
- the measurement process of the mobile station device includes a measurement result other than the cell specified by the cell identification information of the base station device.
- the measurement processing of the mobile station apparatus is performed by using broadcast information of a base station apparatus having global cell identification information specified by cell identification information of the base station apparatus. At least two base station apparatuses that acquire and transmit radio signals of the same synchronization channel are identified.
- a mobile communication system is a mobile communication system including a mobile station device and a base station device, and the base station device has the same synchronization channel within a predetermined communication range.
- cell identification information of the base station apparatus that transmits radio signals of the same synchronization channel is included in a handover instruction message and transmitted to the mobile station apparatus
- a mobile station apparatus that obtains broadcast information of a base station apparatus having global cell identification information specified by the cell identification information of the handover instruction message, and transmits a radio signal of the same synchronization channel That starts a handover procedure after identifying global cell identification information of at least two base station devices that transmit It comprises a processing unit.
- the base station apparatus is a base station apparatus that communicates with a mobile station apparatus, and transmits at least two base stations that transmit radio signals of the same synchronization channel within a predetermined communication range.
- a cell identification information transmission unit is provided that transmits cell identification information of a base station device that transmits a radio signal of the same synchronization channel to the mobile station device.
- a mobile station apparatus is a mobile station apparatus that communicates with a base station apparatus, performs measurement processing based on cell identification information of the base station apparatus, and is obtained by the measurement process.
- a measurement result transmitting unit for transmitting the measured result to the base station apparatus.
- a base station apparatus is a base station apparatus that communicates with a mobile station apparatus, and transmits at least two base stations that transmit radio signals of the same synchronization channel within a predetermined communication range.
- a cell identification information transmission unit is provided that includes cell identification information of a base station device that transmits a radio signal of the same synchronization channel in a handover instruction message and transmits the cell identification information to the mobile station device.
- the mobile station apparatus is a mobile station apparatus that communicates with the base station apparatus, and has the global cell identification information specified by the cell identification information of the handover instruction message. Is provided from the base station apparatus, and a handover processing unit that starts a handover procedure after identifying global cell identification information of at least two base station apparatuses that transmit radio signals of the same synchronization channel is provided.
- a mobile communication method is a mobile communication method using a mobile station apparatus and a base station apparatus, and the base station apparatus has the same synchronization channel within a predetermined communication range.
- the mobile station apparatus performs a measurement process based on cell identification information of the base station apparatus, and has a measurement result transmission process of transmitting a measurement result obtained by the measurement process to the base station apparatus.
- a mobile communication method is a mobile communication method using a mobile station device and a base station device, and the base station device has the same synchronization channel within a predetermined communication range.
- the cell identification information of the base station apparatus that transmits the radio signal of the same synchronization channel is included in the handover instruction message and transmitted to the mobile station apparatus.
- the mobile station apparatus acquires broadcast information of a base station apparatus having global cell identification information specified by the cell identification information of the handover instruction message, and transmits the same synchronization channel.
- a handover process for starting a handover procedure after identifying global cell identification information of at least two base station apparatuses that transmit radio signals With the process.
- the base station device notifies the mobile station device of the presence of the collision cell, so that the mobile station device can communicate with the base station device based on the presence of the collision cell. Therefore, the process at the time of communicating between a mobile station apparatus and a base station apparatus can be simplified by not exchanging an unnecessary radio signal between base station apparatuses of a collision cell.
- FIG. 12 It is a figure which shows another example of a measurement report message. It is a figure which shows an example of a hand-over instruction message. It is a figure which shows another example of a hand-over instruction message. It is a sequence diagram which shows the hand-over procedure by the 3rd Embodiment of this invention. It is a flowchart which shows the GCID acquisition process (step S309 of FIG. 12) of the mobile station apparatus 100 by the 3rd Embodiment of this invention. It is a sequence diagram which shows the handover procedure by the 4th Embodiment of this invention. It is a flowchart which shows the GCID exception process of the downlink reference signal processing part of the mobile station apparatus by the 4th Embodiment of this invention.
- 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 unit, 107a, 107b ... downlink reference signal processing unit, 108 ... encoding unit, 109 ... modulation unit, 110 ... transmission unit, 111 ... upper layer, 200 ... base Station device 201... Receiving unit 202 202 demodulating unit 203 control unit 204 data processing unit 205 control signal processing unit 206 coding unit 207 ..Modulation unit, 208 ... Neighboring base station apparatus information management unit, 209 ... Transmission unit, 210 ...
- the physical channel according to each embodiment of the present invention includes a broadcast information channel, an uplink data channel, a downlink data channel, a downlink shared control channel, an uplink shared control channel, a random access channel, a synchronization channel (SCH), and a reference signal.
- a broadcast information channel an uplink data channel, a downlink data channel, a downlink shared control channel, an uplink shared control channel, a random access channel, a synchronization channel (SCH), and a reference signal.
- SCH synchronization channel
- the uplink data channel and the downlink data channel are classified as data channels.
- the broadcast information channel, downlink shared control channel, uplink shared control channel, and random access channel are classified as control channels.
- the synchronization channel (SCH) and the reference signal are classified as radio signals.
- Physical channels may be added in the future, it does not affect the description of the embodiment of the present invention.
- Reference signals include a downlink reference signal and an uplink reference signal.
- a broadcast information channel (BCH: Broadcastcast 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. Furthermore, the broadcast information channel (BCH) is classified into P-BCH (Primary BCH: primary broadcast information channel) and D-BCH (Dynamic BCH: dynamic broadcast information channel).
- P-BCH Primary BCH: primary broadcast information channel
- D-BCH Dynamic BCH: dynamic broadcast information channel
- the primary broadcast information channel (P-BCH) is transmitted from the base station apparatus to the mobile station apparatus using, for example, the center subcarrier of subframe # 0.
- the dynamic broadcast information channel (D-BCH) is transmitted from the base station apparatus to the mobile station apparatus using the downlink shared control channel, and the transmission position can be varied for each cell.
- the downlink reference signal is a pilot signal transmitted from the base station apparatus to the mobile station apparatus with quasi-static 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 at a predetermined time interval and uses it to determine the reception quality for each cell.
- the downlink reference signal is used as a reference signal for demodulating downlink data 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.
- FIG. 1 is a schematic block diagram showing a configuration of a mobile station apparatus 100 according to the first embodiment of the present invention.
- the mobile station apparatus 100 includes a reception unit 101, a demodulation unit 102, a control unit 103 (also referred to as a handover processing unit), a control signal processing unit 104, a data processing unit 105, a broadcast information processing unit 106, a downlink reference signal processing unit 107a, A coding unit 108, a modulation unit 109, a transmission unit 110 (also referred to as a measurement result transmission unit), an upper layer 111, and an antenna A1 are provided.
- the reception signal (transmission signal from the base station apparatus) is received by the reception unit 101 via the antenna A1.
- the received signal is output to the demodulation unit 102, demodulated based on the reception control information input from the control unit 103, and classified into a downlink data channel, a downlink shared control channel, a broadcast information 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 transmitted to the data processing unit 105 if it is a downlink data channel, to the control signal processing unit 104 if it is a downlink shared control channel, to the broadcast information processing unit 106 if it is a broadcast information channel, and to the downlink information signal. If there is, it is output to the downlink reference signal processing unit 107a.
- channels other than those described above they are output to other channel control units (not shown), but since this embodiment is not affected, description thereof is omitted.
- the data processing unit 105 extracts the traffic data and outputs it to the upper layer 111.
- the control signal processing unit 104 takes out the control data and outputs it to the upper layer 111.
- the notification information processing unit 106 extracts notification information data and outputs it to the upper layer 111.
- the downlink reference signal processing unit 107 a extracts the reference data and outputs it to the upper layer 111. Control information is input from the upper layer 111 to the control unit 103.
- traffic data and control data are input from the upper layer 111 to the encoding unit 108 and encoded as transmission data.
- the control data includes uplink reference signals and uplink shared control channel data.
- Transmission control information is input from the control unit 103 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 input to the modulation unit 109.
- Modulation section 109 performs modulation processing on transmission data with an appropriate modulation scheme in accordance with information instructed by control section 103.
- the data modulated by the modulation unit 109 is input to the transmission unit 110, and after appropriate power control, is transmitted to the base station apparatus from the antenna A1 based on the channel arrangement.
- illustration is abbreviate
- the operation of each block is comprehensively controlled by the upper layer 111.
- Transmitter 110 performs measurement processing based on the cell identification information of the base station device, and transmits a reception quality measurement report obtained by the measurement processing to the base station device.
- the control unit 103 acquires broadcast information of the base station apparatus having the global cell identification information specified by the cell identification information of the handover instruction message. And the control part 103 starts a handover procedure, after identifying the global cell identification information of the at least 2 base station apparatus which transmits the radio signal of the same synchronous channel.
- FIG. 2 is a block diagram showing an example of 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, a coding unit 206, a modulation unit 207, a neighboring base station device information management unit 208, and a transmission unit 209 ( Cell identification information transmission unit), upper layer 210, and antenna A2.
- a reception signal (transmission signal from mobile station apparatus 100 or another base station apparatus 200) is received by reception section 201 via antenna A2. Also, reception control information related to data reception control is output from the control unit 203. The received signal is output to the demodulator 202, divided into a data channel and a control channel based on the reception control information instructed from the controller 203, and demodulated respectively. In the case of channels other than those described above, they are output to other channel control units (not shown), but are omitted because they do not affect the present embodiment.
- Each demodulated data is output to the data processing unit 204 if it is a data channel, and to the control signal processing unit 205 if it is a control channel.
- the data processing unit 204 extracts traffic data and outputs it to the upper layer 210.
- the control signal processing unit 205 extracts control data and outputs it to the upper layer 210.
- the control data obtained by the control signal processing unit 205 includes data related to the base station apparatus 200 such as quality information of the base station apparatus 200 measured by the mobile station apparatus 100 and cell ID allocation information of the peripheral cells (peripheral base station data). ) Is included, the control data is output to the neighboring base station apparatus information management unit 208.
- the neighboring base station apparatus information management unit 208 When the neighboring base station apparatus information management unit 208 detects a collision of cell IDs in a predetermined area based on the quality information and neighboring base station data, the neighboring base station apparatus information management unit 208 notifies the mobile station apparatus 100 of the collision cell ID. Necessary data is output to the upper layer 210. Further, control information is input from the upper layer 210 to the control unit 203. On the other hand, traffic data and control data are input to the encoding unit 206 from the upper layer 210. The control data includes a synchronization channel, a broadcast information channel, and a downlink shared control channel. Further, the control unit 203 outputs transmission control information to the encoding unit 206, the modulation unit 207, and the transmission unit 209.
- the traffic data and control data encoded by the encoding unit 206 are input to the modulation unit 207.
- the modulation unit 207 performs modulation processing on each transmission data with an appropriate modulation method according to the transmission control information from the control unit 203.
- the data modulated by the modulation unit 207 is input to the transmission unit 209, and after appropriate power control, is transmitted from the antenna A2 based on the channel arrangement.
- illustration is abbreviate
- the transmission unit 209 transmits the radio signal of the same synchronization channel when there are at least two base station devices 200 that transmit the radio signal of the same synchronization channel within a predetermined communication range.
- Cell identification information is transmitted to the mobile station apparatus 100.
- the transmission unit 209 transmits base station apparatuses 200 that transmit radio signals of the same synchronization channel.
- Cell identification information is included in the handover instruction message and transmitted to the mobile station apparatus 100.
- FIG. 3 is a sequence diagram showing a measurement report process of the mobile station device 100 according to the first embodiment of the present invention.
- FIG. 3 shows a measurement report process of the mobile station device 100 under a situation where the cell IDs collide.
- 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 source cell knows that the same cell ID (CID_B in this case) is used for the adjacent cell and the collision cell.
- the source cell notifies the collision cell ID information to the mobile station device 100 before or during measurement (step S101).
- the collision cell ID information includes at least a cell ID (CID_B).
- the source cell (CID_A) may use a broadcast information channel (either P-BCH or D-BCH), or shared downlink. A control channel may be used. Furthermore, any other physical channel or message may be used as long as the collision cell ID information can be notified from the source cell to the mobile station apparatus 100.
- the mobile station device 100 receives the downlink reference signal from the source cell whose cell ID is CID_A (step S102). Also, the mobile station device 100 receives a downlink reference signal from an adjacent cell whose cell ID is CID_B (step S103). Moreover, the mobile station apparatus 100 receives a downlink reference signal from the collision cell whose cell ID is CID_B (step S104).
- the mobile station apparatus 100 which acquired the collision cell ID information performs a collision cell ID exception process (step S105).
- the collision cell ID exception process the mobile station device 100 restricts the reception processing and reception quality measurement of the downlink reference signal for the cell with the cell ID (CID_B in FIG. 3) indicated by the collision cell ID information, and receives the signal between cells. Control not to use for quality judgment. Alternatively, reporting of an event (for example, establishment of a handover condition) based on the reception quality of the cell with the cell ID indicated by the conflicting cell ID information is suppressed.
- an event for example, establishment of a handover condition
- the reception quality of the cell of CID_B that is, the reception quality of the neighboring cell and the collision cell, and the event report are not included in the measurement report message in the measurement report process and are transmitted to the source cell CID_A (step S107).
- FIG. 4 is a schematic block diagram showing the configuration of the downlink reference signal processing unit 107a of the mobile station device 100 (FIG. 1) according to the first embodiment of the present invention.
- the downlink reference signal processing unit 107a includes a downlink reference signal extraction unit 1071a, a sequence selection unit 1072a, a cell ID management unit 1073a, a correlation processing unit 1074a, and a quality management unit 1075a.
- Reception control information is input from the control unit 103 to the sequence selection unit 1072a.
- reception control information required for the sequence selection unit 1072a for example, frequency bandwidth, reception time information (frame information, subframe information, slot information, etc.), reception frequency information (reception resource block number, subcarrier number, etc.), There is a cell ID.
- Sequence selection section 1072a selects (or generates) an appropriate downlink reference signal sequence used for demodulation based on the received reception control information, and inputs the signal (selected signal) to correlation processing section 1074a.
- the collision cell ID information is received, the collision cell ID information (cell ID) in the reception control signal is input to the cell ID management unit 1073a.
- the cell ID management unit 1073a notifies the sequence selection unit 1072a not to select (or generate) a downlink reference signal sequence based on the conflicting cell ID.
- the received downlink reference signal is input to the downlink reference signal extraction unit 1071a.
- the downlink reference signal extraction unit 1071a 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 1074a as an extraction signal.
- the correlation processing unit 1074a performs correlation processing between the selection signal and the extracted signal based on the cell ID other than the collision cell, and outputs a correlation signal to the quality management unit 1075a.
- the quality management unit 1075a measures the reception quality of the cell for each cell ID based on the correlation signal, and outputs it to the upper layer 111 as reference data.
- the reception quality is EUTRA Carrier RSSI (Received Signal Strength Indicator), RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), or the like.
- the quality management unit 1075a measures a quality information indicator (CQI) for each of one or more resource blocks or a plurality of subcarriers in the serving cell, and outputs the quality information indicator (CQI) to the higher layer 111 as reference data.
- the operation of the downlink reference signal processing unit 107a extracts a downlink reference signal of a cell other than the cell ID (collision cell ID) notified by the collision cell ID information, and outputs reference data indicating reception quality from the extracted signal.
- the processing method described in FIG. For example, a method of limiting the output corresponding to the cell of the collision cell ID when outputting the correlation signal or the reference data may be used.
- FIG. 5 is a flowchart showing a collision cell ID exception process (step S105 in FIG. 3) by the downlink reference signal processing unit 107a of the mobile station apparatus 100 (FIG. 1) according to the first embodiment of the present invention.
- the process of FIG. 5 is started when the mobile station apparatus 100 receives collision cell ID information.
- the received collision cell ID information is recorded in the cell ID management unit 1073a (step S11).
- it is determined whether the cell ID (collision cell ID) specified by the collision cell ID information is included in the cell ID (detected cell ID) input to the sequence selection unit 1072a (step S12).
- the sequence selection unit 1072a selects a signal other than the downlink reference signal corresponding to the conflicting cell ID (step S13).
- the collision cell ID is not included (“NO” in step S12)
- the downlink reference signal based on the reception control signal is selected by the sequence selection unit 1072a (step S14).
- correlation processing between the selection signal in step S13 or step S14 and the received downlink reference signal extraction signal is performed in the correlation processing unit 1074a (step S15), and a correlation signal is output.
- the measurement report of the reception quality of the cell having the conflicting cell ID is not performed from the mobile station device 100 to the base station device 200. For this reason, the reception quality of the cell having the conflicting cell ID is not used as the handover reference, and it is not specified as the handover destination cell in the handover instruction message. Further, GCID management may be performed only by the base station apparatus 200, and management by the mobile station apparatus 100 becomes unnecessary.
- the mobile station apparatus 100 measures the downlink reference signal of the colliding cell by the base station apparatus 200 clearly indicating that the same cell ID exists and collides with each other. There is no need. Therefore, it is possible to eliminate the uncertainty that it is unknown which cell the mobile station apparatus 100 collides with at the time of handover, and to improve the success probability of handover. Further, it is not necessary for the mobile station apparatus to measure unnecessary reception quality regarding the conflicting cell. Furthermore, since the measurement report message regarding the conflicting cell is not transmitted from the mobile station apparatus 100 to the base station apparatus 200, power consumption in the mobile station apparatus can be reduced.
- the mobile communication system according to the second embodiment includes a base station device and a mobile station device.
- the configurations of the base station apparatus and mobile station apparatus according to the second embodiment are the same as those of the base station apparatus 200 (FIG. 2) and mobile station apparatus 100 (FIG. 1) according to the first embodiment, respectively. Is omitted.
- the mobile station apparatus 100 according to the second embodiment includes a downlink reference signal processing unit 107b instead of the downlink reference signal processing unit 107a.
- the mobile station device 100 that has acquired the conflicting cell ID information receives a GCID before the measurement report process, thereby identifying the reception quality of the cell of each conflicting cell ID.
- the present embodiment is suitable when the transmission timing between the base station devices 200 is asynchronous, but can also be applied when the transmission timing between the base station devices 200 is synchronized.
- FIG. 6 is a sequence diagram showing a handover procedure according to the second embodiment of the present invention.
- FIG. 6 shows a handover procedure under a situation where the cell IDs collide, and the relationship between the mobile station device 100, the serving cell and the neighboring cells is the same as FIG. Note that the transmission of downlink reference signals from each cell (steps S102, S103, and S104 in FIG. 3) is not shown.
- the source cell notifies collision cell ID information to the mobile station device 100 before or during measurement (step S201).
- the collision cell ID information includes at least a cell ID (CID_B).
- the source cell (CID_A) may use a broadcast information channel (either P-BCH or D-BCH) or a downlink shared control channel. Also good. Furthermore, any other physical channel or message may be used as long as the collision cell ID information can be notified from the source cell to the mobile station apparatus 100.
- the mobile station device 100 that has acquired the conflicting cell ID information performs GCID acquisition processing (step S202).
- the GCID acquisition process is a process of receiving a broadcast information channel transmitted from the cell with the cell ID (CID_B in FIG. 6) notified by the collision cell ID information, and the GCID assigned to the cell with the specified cell ID. (In FIG. 6, GCID_B) is acquired.
- the mobile station device 100 receives the GCID (steps S203 and S204), and performs measurement in which the acquired GCID and the cell ID are associated with each other in the measurement measurement report process (step S205).
- the cells are asynchronous, it is determined that a channel having the same reception timing of the downlink reference signal and the broadcast information channel is a channel transmitted from the same cell, and reception of the downlink reference signal is performed for each determined cell.
- the quality is associated with the GCID acquired from the broadcast information channel.
- the measurement result is notified to the source cell (CID_A) by a measurement report message by the collision measurement report process (step S206).
- the reception quality that associates the cell ID with the acquired GCID is set in the measurement report message.
- the reception quality of cells other than the cell ID notified as the collision cell ID information may be the correspondence between the cell ID and the reception quality as usual.
- the source cell (CID_A) can determine from the contents of the measurement report message whether the reception quality measured by the mobile station device 100 is a neighboring cell (CID_B) or a collision cell (CID_B).
- the source cell (CID_A) determines that a handover to the neighboring cell (CID_B) is necessary
- the handover request message of the mobile station device 100 is transferred from the source cell (CID_A) to the neighboring cell (CID_B) with a handover request message.
- the necessity is notified and preparation for handover is requested (step S207).
- 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 S208).
- the source cell (CID_A) that has received the handover request permission message notifies the mobile station device 100 of the handover instruction message (step S209). At this time, when the cell of the collision cell ID is specified by the handover instruction message, the handover instruction message including both the cell ID and the GCID is notified.
- the handover process is started.
- the handover execution time is included in the handover instruction message
- the mobile station apparatus 100 executes the handover when the handover execution time is reached (step S210). Immediate execution may be designated as the handover execution time.
- the mobile station apparatus 100 switches the radio frequency specified by the handover instruction message and the control parameter of the transmission / reception circuit at the handover execution time. Thereafter, the mobile station device 100 performs a downlink synchronization establishment process for establishing downlink radio synchronization with the designated neighboring cell CID_B (handover process).
- 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 100 that has completed downlink synchronization establishment performs random access transmission in order to establish uplink synchronization with the adjacent cell (CID_B) (step S211).
- the processes in steps S212 and S213 are the same as the processes in steps S212 and S213 in FIG.
- FIG. 7 is a schematic block diagram showing the configuration of the downlink reference signal processing unit 107b of the mobile station apparatus 100 according to the second embodiment of the present invention.
- the downlink reference signal processing unit 107b includes a downlink reference signal extraction unit 1071b, a sequence selection unit 1072b, a cell ID management unit 1073b, a correlation processing unit 1074b, and a quality management unit 1075b.
- Reception control information is input from the control unit 103 to the sequence selection unit 1072b.
- reception control information required for the sequence selection unit 1072b for example, frequency bandwidth, reception time information (frame information, subframe information, slot information, etc.), reception frequency information (reception resource block number, subcarrier number, etc.), There is a cell ID.
- Sequence selection section 1072b selects (or generates) an appropriate downlink reference signal sequence used for demodulation based on the received reception control information, and inputs the signal (selection signal) to correlation processing section 1074b.
- collision cell ID information cell ID
- GCID information in the reception control signal are input to the cell ID management unit 1073b.
- the collision cell ID information and the GCID information uniquely correspond to each cell.
- the received downlink reference signal is input to the downlink reference signal extraction unit 1071b.
- the downlink reference signal extraction unit 1071b 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 1074b as an extracted signal.
- the cell ID management unit 1073b notifies the correlation processing unit 1074b of the GCID information and the collision cell ID information.
- the correlation processing unit 1074b When the correlation processing unit 1074b performs correlation processing between the selection signal and the extracted signal based on the cell ID of the collision cell, when the correlation signal is output to the quality management unit 1075b, the correlation processing unit 1074b associates with the GCID information in addition to the cell ID.
- the correlation signal is output to the quality management unit 1075b for each GCID. If it is other than the cell ID of the collision cell, the correlation signal for each cell ID is output to the quality management unit 1075b as usual.
- the quality management unit 1075b measures the reception quality of the cell for each cell ID or GCID based on the correlation signal, and outputs it to the upper layer 111 as reference data.
- the reception quality is EUTRA Carrier RSSI, RSRP, RSRQ, path loss, or the like.
- the quality management unit 1075b measures the quality information index for each of one or more resource blocks or a plurality of subcarriers in the serving cell, and outputs the quality information index to the upper layer 111 as reference data.
- the operation of the downlink reference signal processing unit 107b is a process capable of outputting reference data indicating the reception quality of the cell for each GCID during the correlation process with the downlink reference signal corresponding to the cell ID notified by the collision cell ID information. If it can be implemented, the method described with reference to FIG.
- FIG. 8 is a flowchart showing GCID acquisition processing by the mobile station apparatus 100 according to the second embodiment of the present invention.
- the process of FIG. 8 is started when the mobile station apparatus 100 receives collision cell ID information.
- the mobile station apparatus 100 records the received collision cell ID information (step S21).
- the broadcast information channel transmitted in the cell having the cell ID recorded in step S21 is received, and broadcast information for each cell is acquired (step S22).
- GCID information is acquired from the received notification information, recorded (step S23), and the process of FIG. 8 ends.
- FIG. 9 is a flowchart showing a measurement report process at collision (step S205 in FIG. 6) of the downlink reference signal processing unit 107b of the mobile station apparatus 100 according to the second embodiment of the present invention.
- the process of FIG. 9 is started when the mobile station device 100 receives the conflicting cell ID information.
- the received collision cell ID information is recorded in the cell ID management unit 1073b (step S25).
- the downlink reference signal based on the reception control signal is selected by the sequence selection unit 1072b (step S26).
- it is determined whether the cell ID (collision cell ID) specified by the collision cell ID information is included in the cell ID (detected cell ID) selected by the sequence selection unit 1072b (step S27).
- the correlation processing unit 1074b When the collision cell ID is included (“YES” in step S27), the correlation processing unit 1074b performs a correlation process between the selection signal in step S26 and the received extracted signal of the downlink reference signal of the collision cell. Here, correlation processing is performed so that a correlation signal is output for each GCID of the collided cell ID (step S28). When the collision cell ID is not included (“NO” in step S27), the correlation processing unit 1074b performs correlation processing between the selection signal in step S26 and the extracted signal of the downlink reference signal received (step S29). The correlation signal is output.
- FIGS. 10A and 10B are diagrams illustrating an example of a measurement report message.
- FIG. 10A is an example of a conventional message that does not include the cell ID specified by the collision cell ID information in the measurement report message.
- FIG. 10B shows an example of a message when the cell ID specified by the collision cell ID information is included in the measurement report message.
- the mobile station apparatus 100 reports cell ID (for example, CID_A) and quality information (for example, quality information_A) as one set.
- a report set for example, a method of reporting a cell having a quality exceeding a certain threshold can be used, but other methods may be used.
- the mobile station apparatus 100 sets the cell ID (for example, CID_B), GCID (for example, GCID_B), and reception quality (quality information_B) to 1 Report as a set.
- the cell IDs that do not collide are the same as in FIG. 10A. Note that one or more types of measurement results may be included as the content of the quality information.
- FIG. 11A and 11B are diagrams illustrating an example of a handover instruction message.
- FIG. 11A is an example of a conventional message when a handover to a cell other than the cell ID specified by the conflicting cell ID information is instructed.
- FIG. 11B is an example of a message for instructing handover to the cell ID specified by the conflicting cell ID information.
- the base station apparatus 200 notifies at least a cell ID and a control parameter used for handover.
- the control parameter includes frequency information, CID information (for example, CID_B), preamble information, handover execution time, and uplink transmission timing. Note that other control parameters may be used as long as they are necessary for the handover procedure.
- the base station apparatus 200 notifies the control parameter to which at least GCID information (eg, GCID_B) is added in addition to the information of FIG. 11A.
- the measurement report of the reception quality corresponding to the GCID of the cell ID colliding from the mobile station device 100 to the base station device 200 is performed. Therefore, the mobile station device 100 can report the reception quality of each cell even if the cell ID is a collision cell.
- the base station apparatus 200 can appropriately select a handover destination cell. Furthermore, it is possible to specify a cell designated as a handover destination cell. In addition, since the mobile station device 100 only needs to acquire the GCID of the designated cell when receiving the collision cell ID information, the measurement processing procedure in the area where there is no conflicting cell may be the same as usual. .
- the mobile station device 100 has the same cell ID and is colliding with each other, and the GCID of the colliding cell is clearly indicated from the base station device 200, and thus based on the GCID. It is possible to measure the downlink reference signal. Also, even in the case of a conflicting cell, each quality information can be clearly indicated by the GCID, and a highly accurate measurement result can be reported to the base station apparatus 200. Thereby, since inappropriate handover can be suppressed, communication quality can be improved. In addition, it is possible to eliminate the uncertainty that it is unclear to which cell the mobile station apparatus 100 is to be handed over at the time of handover, and improve the success probability of handover.
- the mobile communication system according to the third embodiment includes a base station device and a mobile station device.
- the configurations of the base station apparatus and the mobile station apparatus according to the third embodiment are the same as those of the base station apparatus 200 (FIG. 2) and the mobile station apparatus 100 (FIG. 1) according to the first embodiment, respectively. Is omitted.
- the third embodiment provides a mechanism capable of identifying a cell accessed after a handover by including collision cell ID information in the handover instruction message.
- FIG. 12 is a sequence diagram showing a handover procedure according to the third embodiment of the present invention.
- FIG. 12 shows the handover procedure under the situation where the cell IDs collide.
- the relationship between the mobile station device 100, the serving cell and the neighboring cells is the same as in FIG.
- the processing steps S305, S306, S307) until the handover instruction message is notified from the source cell (CID_A) is the same as the processing of FIG. 6 (steps S206, S207, S208).
- the measurement process (step S301, S302, S303, S304) of the downlink reference signal in the measurement report process is the same as the process (steps S020, S021, S022, S023) in FIG.
- the base station apparatus 200 of the source cell (CID_A) manages information such as the reception quality of the neighboring cells reported from the mobile station apparatus 100 and the number of successful handovers between the cells. Held in the portion 208. Then, the base station apparatus 200 of the source cell (CID_A) uses these statistical information, and even if the mobile station apparatus 100 measures without identifying the downlink reference signal of the same cell ID, it is preferable to some extent. A handover destination cell can be designated.
- the handover instruction message is notified including the collision cell ID information (step S308).
- the collision cell ID information includes at least a cell ID (for example, CID_B) and a GCID (for example, GCID_B).
- the mobile station apparatus 100 that has acquired the conflicting cell ID information performs a handover-time GCID acquisition process (step S309).
- the handover-time GCID acquisition process is a process for receiving a broadcast information channel transmitted from a cell having a cell ID (CID_B in FIG. 12) notified by collision cell ID information in the handover instruction message. This is a process for acquiring the GCID assigned to the ID cell.
- the mobile station apparatus 100 receives the GCID from the broadcast information channel of the cell ID designated before the handover process (steps S310 and S311), and uniquely specifies the handover destination cell (in FIG. 12, GCID_B). A certain neighboring cell CID_B).
- the handover execution time is included in the handover instruction message, the mobile station apparatus 100 performs GCID acquisition processing before reaching the handover execution time, and executes the handover when the handover execution time is reached. (Step S312).
- the mobile station device 100 executes the handover immediately after obtaining the GCID.
- the mobile station device 100 switches the radio frequency specified by the handover instruction message and the control parameters of the transmission / reception circuit. Thereafter, the mobile station device 100 performs downlink synchronization establishment processing for establishing downlink wireless synchronization with the adjacent cell (CID_B) having the same GCID (handover processing).
- the control parameter for downlink synchronization establishment processing is included in the previous handover instruction message, or is notified or notified to the mobile station apparatus 100 from the source cell (CID_A) in advance.
- the mobile station apparatus 100 that has completed downlink synchronization establishment performs random access transmission in order to establish uplink synchronization with the neighboring cell (CID_B) (step S313).
- the processes in steps S314 and S315 are the same as the processes in steps S212 and S213 in FIG.
- FIG. 13 is a flowchart showing the GCID acquisition process (step S309 in FIG. 12) of the mobile station device 100 according to the third embodiment of the present invention.
- the process of FIG. 13 is started when the mobile station apparatus 100 receives a handover instruction message including collision cell ID information.
- the mobile station device 100 records the received collision cell ID information (step S31).
- the mobile station device 100 receives the broadcast information channel transmitted in the cell with the cell ID recorded in step S31, and performs a process of acquiring broadcast information for each cell (step S32).
- the mobile station apparatus 100 acquires GCID information from the received broadcast information, records it (step S33), and ends the process shown in FIG.
- the configuration of the handover instruction message used in the present embodiment is the same as that in FIG. 11A or FIG. 11B. That is, when instructing the mobile station apparatus 100 to perform handover to a cell other than the cell ID specified by the collision cell ID information, the base station apparatus 200 transmits the message of FIG. 11A. In addition, when instructing handover to the cell ID specified by the conflicting cell ID information, the base station device 200 transmits the message of FIG. 11B to the mobile station device 100.
- the mobile station apparatus 100 does not need to perform a special process on the measurement report, and the control becomes simple. Moreover, the base station apparatus 200 can specify the cell designated as the handover destination cell by using the GCID. For this reason, the mobile station apparatus 100 can specify the handover destination cell even when the cell IDs collide. Further, since the mobile station device 100 only needs to acquire the GCID of the designated cell when receiving the collision cell ID information in the handover instruction message, the handover procedure in the area where there is no conflicting cell is Same as usual.
- the mobile station device 100 clearly indicates from the base station device 200 that the same cell ID exists and collides with each other, and the GCID of the conflicting cell.
- the GCID of the conflicting cell.
- the mobile communication system according to the fourth embodiment includes a base station device and a mobile station device.
- the configurations of the base station apparatus and mobile station apparatus according to the fourth embodiment are the same as those of the base station apparatus 200 (FIG. 2) and mobile station apparatus 100 (FIG. 1) according to the first embodiment, respectively. Is omitted.
- a cell ID and a GCID are included in the collision cell ID information, and the GCID is received before the measurement report processing, thereby providing a mechanism capable of identifying the reception quality of the cell of each collision cell ID.
- the mechanism in which the mobile station apparatus 100 does not report the reception quality of the cell of the designated GCID is provided.
- This embodiment is suitable when the transmission timing between the base station apparatuses 200 is asynchronous.
- the present invention can also be applied when the transmission timing between the base station devices 200 is synchronized.
- FIG. 14 is a sequence diagram showing a measurement report process of the mobile station device 100 according to the fourth embodiment of the present invention.
- FIG. 14 shows a measurement report process of the mobile station device 100 under a situation where the cell IDs collide.
- the relationship between the mobile station device 100, the serving cell and the neighboring cells is the same as in FIG.
- the source cell notifies the conflicting cell ID information to the mobile station device 100 before or during measurement (step S401).
- the collision cell ID information includes at least a cell ID (for example, CID_B) and a GCID (for example, GCID_C).
- the source cell may use a broadcast information channel (either P-BCH or D-BCH) or a downlink shared control channel. May be. Furthermore, any other physical channel or message may be used as long as the collision cell ID information can be notified from the source cell to the mobile station apparatus 100.
- a broadcast information channel either P-BCH or D-BCH
- a downlink shared control channel May be.
- any other physical channel or message may be used as long as the collision cell ID information can be notified from the source cell to the mobile station apparatus 100.
- the mobile station device 100 that has acquired the conflicting cell ID information performs GCID acquisition processing (step S402).
- the GCID acquisition process is a process of receiving a broadcast information channel transmitted from the cell with the cell ID (CID_B in FIG. 14) notified by the collision cell ID information, and the GCID assigned to the cell with the specified cell ID. It is a process to acquire.
- the mobile station device 100 receives the GCID (steps S403 and S404), and performs a collision GCID exception process (step S405).
- Collision GCID exception processing restricts reception processing and reception quality measurement of downlink reference signals related to the cell of GCID (GCID_C in FIG. 14) indicated by collision cell ID information, and does not use it for determination of reception quality between cells. Or a process for suppressing reporting of an event (for example, establishment of a handover condition) based on the reception quality of the cell of the GCID indicated by the collision cell ID information.
- the mobile station apparatus 100 determines that the channels having the same reception timing of the downlink reference signal and the broadcast information channel are channels transmitted from the same cell. Then, the mobile station apparatus 100 associates the reception quality of the downlink reference signal with the GCID acquired from the broadcast information channel for each determined cell. And the mobile station apparatus 100 restrict
- the mobile station apparatus 100 predicts the received quality of the received downlink reference signal for each cell based on the received quality (received power, BLER, etc.) of the broadcast information channel. Then, the mobile station apparatus 100 associates the predicted reception quality of the downlink reference signal with the GCID acquired from the broadcast information channel. Alternatively, the mobile station device 100 measures the quality of the downlink reference signal of the cell of the collision cell ID information without combining the received signal, and associates it with the GCID acquired from the broadcast information channel. And the report of a downlink reference signal is restrict
- the mobile station device 100 restricts the reception processing and reception quality measurement of the downlink reference signal for the cell of the GCID (GCID_C in FIG. 14) indicated by the collision cell ID information, and the reception quality between the cells. It is controlled not to use it for the judgment. Thereby, the reception quality of the cell of GCID_C is transmitted to the source cell (CID_A) without being included in the measurement report message in the measurement report process (step S406) (step S407).
- the downlink reference signal processing unit of the mobile station apparatus 100 of the present embodiment can be the same as the downlink reference signal processing unit 107b of FIG. 7, detailed description thereof is omitted.
- processing capable of outputting reference data other than the downlink reference signal related to the cell with the specified GCID is performed.
- the output corresponding to the cell of the GCID (collision cell ID) specified by the collision cell ID information when the selection signal, the correlation signal, or the reference data is output is limited.
- the GCID acquisition process can use the same process as in FIG.
- FIG. 15 is a flowchart showing the GCID exception processing of the downlink reference signal processing unit 107b (see FIG. 7) of the mobile station device 100 according to the fourth embodiment of the present invention.
- the process of FIG. 15 is started when the mobile station device 100 receives the conflicting cell ID information.
- the mobile station device 100 records the received collision cell ID information in the cell ID management unit 1073b (step S41). Subsequently, it is determined whether the cell ID (collision cell ID) specified by the collision cell ID information is included in the cell ID (detected cell ID) input to the sequence selection unit 1072b (step S42).
- the sequence selection unit 1072b further determines whether the GCID is designated by the conflicting cell ID information (step S43). If it is the designated GCID ("YES” in step S43), the sequence selection unit 1072b selects a signal other than the downlink reference signal corresponding to the GCID of the collision cell ID (step S44). When the conflicting cell ID is not included, or when it is not the designated GCID (“NO” in step S42 and “NO” in step S43), the downlink reference signal based on the reception control signal is received by the sequence selection unit 1072b. Selected (step S45).
- the correlation processing unit 1074b performs correlation processing between the selection signal in step S45 and the received downlink reference signal extraction signal (step S46), and outputs a correlation signal.
- the mobile station device 100 does not exclude the reception quality of the cell having the GCID specified by the collision cell ID information, but excludes the reception quality of the cell other than the specified GCID. good.
- the measurement report of the reception quality of the cell with the designated GCID among the conflicting cell IDs is not performed. For this reason, the reception quality of the cell with the GCID specified as the handover reference is not used, and it is not specified as the handover destination cell in the handover instruction message. Further, since the mobile station device 100 only needs to acquire the GCID of the designated cell when receiving the collision cell ID information, the measurement processing procedure in the area where there is no conflicting cell is the same as the normal processing. Can be used.
- the mobile station device 100 indicates that the same cell ID exists and is colliding with each other by the base station device 200. Therefore, among the conflicting cell IDs, the mobile station device 100 has the specified GCID. There is no need to measure the downlink reference signal of the cell. Therefore, at the time of handover, it is possible to eliminate the uncertainty that it is unclear to which cell the mobile station device 100 is to be handed over, and to improve the success probability of handover. Moreover, the mobile station apparatus 100 does not need to measure unnecessary reception quality regarding the cell of the designated GCID among the conflicting cell IDs. Furthermore, since the mobile station apparatus 100 does not transmit the measurement report message regarding the cell of the designated GCID, the power consumption can be reduced.
- a program for realizing the function of each unit of the mobile station apparatus 100 and the base station apparatus 200 of the first to fourth embodiments is recorded on a computer-readable recording medium, and this
- the mobile station apparatus 100 and the base station apparatus 200 may be controlled by causing a computer system to read and execute a program recorded on a recording medium.
- the “computer system” here includes an OS and hardware such as peripheral devices.
- the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated 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 relates to a mobile communication system, a base station apparatus, a mobile station apparatus, and a mobile communication system capable of simplifying processing when communicating between a mobile station apparatus and a base station apparatus even when a collision cell exists. Applicable to mobile communication methods.
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Abstract
Description
本願は、2008年2月4日に、日本に出願された特願2008-024400号に基づき優先権を主張し、その内容をここに援用する。
セルIDは、3種類のプライマリ同期チャネル(P-SCH)と、168種類のセカンダリ同期チャネル(S-SCH)の組み合わせによって決まり、その数は504種類である(3×168=504)。
移動局装置は、プライマリ同期チャネル(P-SCH)のレプリカ信号と受信信号とで相関を取ることによってP-SCH同定処理を行う。これにより、移動局装置は、スロットタイミングを取得する(ステップS1)。
次に、移動局装置は、セカンダリ同期チャネル(S-SCH)のレプリカ信号と受信信号とで相関を取ることによってS-SCH同定処理を行う。これにより、移動局装置は、得られたセカンダリ同期チャネル(S-SCH)の送信パターンによってフレームタイミングを取得する。また、移動局装置は、基地局装置を識別するためのセルID(Identification:識別情報)を取得する(ステップS2)。
EUTRAを含むセルラ移動通信方式では、移動局装置は、基地局装置の通信エリアであるセル(またはセクタ)内において基地局装置と通信する。移動局装置が、ある基地局装置と無線接続されているとき、その移動局装置が位置するセルのことを在圏セルとよぶ。一方、在圏セルの周辺に位置するセルのことを周辺セルとよぶ。
このとき、セル間の受信品質の高低を移動局装置が判定するために使用される信号を下りリファレンス信号とよぶ。下りリファレンス信号は、セルIDに対応した所定の信号系列である。すなわち、セルIDを同定することによって、同時に該当セルで送信される下りリファレンス信号を一意に特定することが可能である(非特許文献1)。
この一定の周波数領域(BR)と1スロット長で区切られた領域(図17のドット状のハッチングを付した領域)を、リソースブロックとよぶ。また、1フレームは10サブフレームから構成される。図17中のBWはシステム帯域幅を示しており、BRはリソースブロックの帯域幅を示している。
なお、ソースセルのセルIDがCID_Aであり、周辺セルのセルIDがCID_Bであるとして、以降の手順を説明する。ここで、移動局装置はCID_AとCID_Bの下りリファレンス信号を、セルIDがCID_Aの基地局装置と、セルIDがCID_Bの基地局装置から、それぞれ受信する(ステップS001、S002)。そして、移動局装置は、各々の下りリファレンス信号から得られる受信品質を測定する。
前記ハンドオーバー要求メッセージを受信した、セルIDがCID_Bの基地局装置は、ハンドオーバーが実行可能と判定した場合、ハンドオーバー要求許可メッセージを、セルIDがCID_Aの基地局装置に通知する(ステップS006)。
ハンドオーバー要求許可メッセージを受信した、セルIDがCID_Aの基地局装置は、移動局装置に対し、ハンドオーバー指示メッセージ(ハンドオーバーコマンドとも称する)を通知する(ステップS007)。
ハンドオーバー実行時間として、即時実行が指定される場合もある。移動局装置は、ハンドオーバー実行時間にハンドオーバー指示メッセージで指定された無線周波数や送受信回路の制御パラメータの切り替えを行う。その後、移動局装置は、セルIDがCID_Bの基地局装置との下り無線同期を確立するための下り同期確立処理を行う(ハンドオーバー処理)。
本来、ランダムアクセスを行う際には、衝突が発生しうる(コンテンションベース)のチャネルが用いられる。しかし、衝突が発生しない(コンテンションフリー)ランダムアクセス送信のため、前記ハンドオーバー指示メッセージにてプリアンブル系列(Dedicated Preamble)を事前に移動局装置毎に割り当てる方法も提案されている(非特許文献2)。
なお、非特許文献1において、下りリファレンス信号のことを下りリファレンスシグナル(Reference signal)やDL-RS(Downlink Reference signal)と記載してあるが、意味は同じである。
ここで、移動局装置はソースセル(CID_A)と隣接セル(CID_B)と衝突セル(CID_B)の下りリファレンス信号をそれぞれ受信する(ステップS020、S021、S022)。そして、移動局装置は、各々の下りリファレンス信号から得られる受信品質を測定する。
そのため、隣接セル(CID_B)と衝突セル(CID_B)の下りリファレンス信号を区別せずに測定し、測定報告処理(ステップS023)にてCID_Aへ測定報告メッセージを通知している(ステップS024)。
すなわち、隣接セル(CID_B)と衝突セル(CID_B)が同期している場合は、移動局装置では合成された下りリファレンス信号が測定される。また、隣接セル(CID_B)と衝突セル(CID_B)が非同期である場合は、一方の下りリファレンス信号は、移動局装置では遅延波と判定される。
また、CID_Bのセルの受信品質が、隣接セル(CID_B)と衝突セル(CID_B)の受信品質を合成したものとして報告されている場合、ハンドオーバー基準として用いるのは不適切である。更に、ソースセル(CID_A)が移動局装置に隣接セル(CID_B)へハンドオーバー指示メッセージを送信する場合においても、ハンドオーバー先のセルが隣接セル(CID_B)であるという明確な指定ができない。よって、移動局装置が衝突セル(CID_B)へハンドオーバーする可能性がある。
GCIDを用いることにより、セルIDだけでは識別不可能であった衝突セルがGCIDによって識別可能となる。また、ハンドオーバー指示メッセージにおいて、GCIDによるハンドオーバー先のセルの指定を行うことで、移動局装置のハンドオーバー先のセルを、明確に指定することが可能となる。
しかしながら、移動局装置が同じセルIDが割り振られていることを自律的に検出し、各々の無線信号を分離して受信することは非常に困難である。
このため、衝突セルが存在する場合に、移動局装置と基地局装置との間で通信する際の処理が複雑になるという問題があった。
3GPP TS(Technical Specification)36.211,Physical Channels and Modulaltion.V8.0.0(http://www.3gpp.org/ftp/Specs/html-info/36211.htm) 3GPP TS36.300,Overall discription;Stage2.V8.3.0(http://www.3gpp.org/ftp/Specs/html-info/36300.htm) Huawei,"Detection of conflicting cell identities",R3-071947,3GPP TSG-RAN WG3 Meeting #57bis,Sophia Antipolis,France,8-11 October 2007
本発明の各実施形態に関わる物理チャネルは、報知情報チャネル、上りデータチャネル、下りデータチャネル、下り共用制御チャネル、上り共用制御チャネル、ランダムアクセスチャネル、同期チャネル(SCH)、リファレンス信号がある。
また、同期チャネル(SCH)とリファレンス信号を無線信号として分類する。物理チャネルは今後追加される可能性もあるが、本発明の実施形態の説明には影響しない。また、リファレンス信号としては下りリファレンス信号と上りリファレンス信号がある。
報知情報チャネル(BCH:Bloadcast Channel)は、セル内の移動局装置で共通に用いられる制御パラメータを通知する目的で、基地局装置から移動局装置に送信される。
更に、報知情報チャネル(BCH)はP-BCH(Primary BCH:プライマリ報知情報チャネル)とD-BCH(Dynamic BCH:ダイナミック報知情報チャネル)とに分類される。
プライマリ報知情報チャネル(P-BCH)は、時間的・周波数的に所定の周期で送信することが予め決められており、移動局装置は、セルIDが同定されたセルについて受信することが可能である。プライマリ報知情報チャネル(P-BCH)は、例えば、サブフレーム#0の中心サブキャリアを用いて、基地局装置から移動局装置に送信される。
一方、ダイナミック報知情報チャネル(D-BCH)は、下り共用制御チャネルを用いて、基地局装置から移動局装置に送信され、セル毎に送信位置を可変にすることも可能である。
また、下りリファレンス信号は、下りリファレンス信号と同時に送信される下りデータの復調のための参照用の信号として用いられる。下りリファレンス信号に使用される系列は、セル毎に一意に識別可能な系列であれば、任意の系列を用いることができる。
始めに、本発明の第1の実施形態について説明する。
図1は、本発明の第1の実施形態による移動局装置100の構成を示す概略ブロック図である。移動局装置100は、受信部101、復調部102、制御部103(ハンドオーバー処理部とも称する)、制御信号処理部104、データ処理部105、報知情報処理部106、下りリファレンス信号処理部107a、符号部108、変調部109、送信部110(測定結果送信部とも称する)、上位レイヤ111、アンテナA1を備えている。
受信制御情報には、各チャネルに関する受信タイミング、多重方法、リソース配置情報や復調に関する情報が含まれている。分類された各チャネルは、下りデータチャネルであればデータ処理部105へ、下り共用制御チャネルであれば制御信号処理部104へ、報知情報チャネルであれば報知情報処理部106へ、下りリファレンス信号であれば下りリファレンス信号処理部107aへと出力される。
なお、前記以外のチャネルの場合、それぞれ他のチャネル制御部(図示省略)へと出力されるが、本実施形態には影響しないため、その説明を省略する。
下りリファレンス信号処理部107aは、リファレンスデータを取り出して上位レイヤ111へと出力する。また、上位レイヤ111から制御部103へ制御情報が入力される。
制御部103から送信制御情報が、符号部108と変調部109、送信部110に入力される。送信制御情報には、上りチャネルに関する送信タイミングや多重方法、各チャネルの送信データの配置情報、変調や送信電力に関する情報が含まれている。
変調部109で変調されたデータは送信部110に入力され、適切に電力制御された後にチャネル配置に基づきアンテナA1より基地局装置に送信される。
なお、その他の移動局装置100の構成要素は本実施形態に関係ないため図示を省略している。各ブロックの動作は、上位レイヤ111によって統括的に制御される。
また、制御部103は、ハンドオーバー指示メッセージのセル識別情報で指定されたグローバルセル識別情報を持つ基地局装置の報知情報を取得する。そして、制御部103は、同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置のグローバルセル識別情報を同定した後にハンドオーバー手順を開始する。
受信信号は復調部202へと出力され、制御部203から指示される受信制御情報を基に、データチャネル、制御チャネルに分けられ、それぞれ復調される。
なお、前記以外のチャネルの場合、それぞれ他のチャネル制御部(図示省略)へと出力されるが、本実施形態には影響しないため省略してある。
制御信号処理部205では制御データを取り出して上位レイヤ210へと出力する。なお、制御信号処理部205で得られる制御データに、移動局装置100が測定した基地局装置200の品質情報や、周辺セルのセルID割り当て情報などの基地局装置200に関するデータ(周辺基地局データ)が含まれるときは、制御データは周辺基地局装置情報管理部208へ出力される。
一方、上位レイヤ210からは、トラフィックデータと制御データが符号部206に入力される。制御データは同期チャネルや報知情報チャネル、下り共用制御チャネルを含む。また、制御部203より送信制御情報が符号部206、変調部207、送信部209に出力される。
変調部207で変調されたデータは送信部209に入力され、適切に電力制御された後にチャネル配置に基づきアンテナA2より送信される。
なお、その他の基地局装置200の構成要素は本実施形態に関係ないため図示を省略してある。また、各ブロックの動作は、上位レイヤ210によって統括的に制御される。
また、送信部209は、所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置200が存在する場合において、同一の同期チャネルの無線信号を送信する基地局装置200のセル識別情報をハンドオーバー指示メッセージに含めて移動局装置100に送信する。
ここでは、移動局装置100は、ソースセル(セルID=CID_A、GCID=GCID_A)に在圏している場合について説明する。また、セルIDが同一のセルである隣接セル(セルID=CID_B、GCID=GCID_B)と衝突セル(セルID=CID_B、GCID=GCID_C)が測定可能な同じエリアに存在している場合について説明する。また、ソースセルは隣接セルと衝突セルとで同じセルID(ここでは、CID_B)が使用されていることを知っている。
衝突セルID情報を、ソースセルから移動局装置100に通知する際には、ソースセル(CID_A)は報知情報チャネル(P-BCHとD-BCHのいずれか)を用いても良いし、下り共用制御チャネルを用いても良い。更には、ソースセルから移動局装置100へ衝突セルID情報を通知可能であれば、それ以外の任意の物理チャネルやメッセージを用いても良い。
セルID管理部1073aは、系列選択部1072aに対し、衝突しているセルIDに基づく下りリファレンス信号の系列を選択(または生成)しないように制限するよう通知する。
相関処理部1074aは、衝突セル以外のセルIDに基づく前記選択信号と抽出信号の相関処理を行い、品質管理部1075aへ相関信号を出力する。品質管理部1075aは、相関信号を基にセルID毎にセルの受信品質を測定し、上位レイヤ111にリファレンスデータとして出力する。
ここで、受信品質とは、EUTRA Carrier RSSI(Received Signal Strength Indicator)、RSRP(Reference Signal Received Power)、RSRQ(Reference Signal Received Quality)、パスロスなどである。
なお、下りリファレンス信号処理部107aの動作は、衝突セルID情報で通知されたセルID(衝突セルID)以外のセルの下りリファレンス信号を抽出し、抽出した信号から受信品質を示すリファレンスデータを出力可能な処理を実施できれば、図4で説明した処理方法でなくても良い。
例えば、相関信号、またはリファレンスデータを出力するときに衝突セルIDのセルに該当する出力を制限するような方法でも良い。
まず、受信した衝突セルID情報をセルID管理部1073aに記録する(ステップS11)。
続いて、系列選択部1072aに入力されるセルID(検出済みセルID)に、前記衝突セルID情報で指定されたセルID(衝突セルID)が含まれているかを判定する(ステップS12)。
そして、ステップS13またはステップS14の選択信号と、受信した下りリファレンス信号の抽出信号との相関処理を相関処理部1074aで行い(ステップS15)、相関信号を出力する。
また、衝突しているセルに関する不要な受信品質を移動局装置が測定する必要がなくなる。更に、衝突しているセルに関する測定報告メッセージを、移動局装置100から基地局装置200に送信しないため、移動局装置における消費電力の削減が可能となる。
次に、本発明の第2の実施形態について説明する。第2の実施形態による移動通信システムは、基地局装置と移動局装置を備えている。第2の実施形態による基地局装置と移動局装置の構成は、それぞれ第1の実施形態による基地局装置200(図2)と移動局装置100(図1)と同様であるため、それらの説明を省略する。
ただし、第2の実施形態による移動局装置100は、下りリファレンス信号処理部107aの代わりに下りリファレンス信号処理部107bを備えている。
本実施形態は、基地局装置200間の送信タイミングが非同期である場合に好適であるが、基地局装置200間の送信タイミングが同期している場合にも適用することができる。
更には、ソースセルから移動局装置100へ衝突セルID情報を通知可能であれば、それ以外の任意の物理チャネルやメッセージを用いても良い。
移動局装置100は、GCIDを受信し(ステップS203、S204)、衝突時測定報告処理(ステップS205)において、取得したGCIDとセルIDとを関連付けた測定を行う。具体的には、セル間が非同期である場合、下りリファレンス信号と報知情報チャネルの受信タイミングが同じものを同一セルから送信されたチャネルだと判定し、判定したセル毎に、下りリファレンス信号の受信品質と報知情報チャネルから取得したGCIDとを関連付ける。
例えば、図6の例で、GCID_Bの報知情報チャネルとGCID_Cの報知情報チャネルとの受信電力の比が1対2であった場合、CID_Bとして受信された下りリファレンス信号の受信品質をGCID_B:GCID_C=1:2として分割したものを各々の受信品質として報告する。または、衝突セルID情報のセルの下りリファレンス信号については、受信信号を合成せずに各々の品質を測定し、受信品質として報告する。
ハンドオーバー要求許可メッセージを受信したソースセル(CID_A)は、移動局装置100に対し、ハンドオーバー指示メッセージを通知する(ステップS209)。このとき、ハンドオーバー指示メッセージで衝突セルIDのセルが指定される場合、セルIDとGCIDの両方を含めたハンドオーバー指示メッセージが通知される。
ハンドオーバー実行時間として、即時実行が指定される場合もある。移動局装置100は、ハンドオーバー実行時間にハンドオーバー指示メッセージで指定された無線周波数や送受信回路の制御パラメータの切り替えを行う。その後、移動局装置100は、指定された隣接セルCID_Bとの下り無線同期を確立するための下り同期確立処理を行う(ハンドオーバー処理)。
一方、衝突セルID情報を受信している場合は、受信制御信号のうち、衝突セルID情報(セルID)とGCID情報がセルID管理部1073bに入力される。衝突セルID情報とGCID情報はセル毎に一意に対応している。
衝突セルのセルID以外であれば、通常通りセルID毎の相関信号が品質管理部1075bへ出力される。品質管理部1075bは、相関信号を基にセルID毎、またはGCID毎のセルの受信品質を測定し、上位レイヤ111にリファレンスデータとして出力する。
ここで、受信品質とは、EUTRA Carrier RSSI、RSRP、RSRQ、パスロスなどである。
なお、下りリファレンス信号処理部107bの動作は、衝突セルID情報で通知されたセルIDに対応する下りリファレンス信号との相関処理時に、GCID毎のセルの受信品質を示すリファレンスデータを出力可能な処理を実施できれば、図7で説明した方法でなくても良い。
まず、移動局装置100は、受信した衝突セルID情報を記録する(ステップS21)。続いて、ステップS21で記録したセルIDのセルにて送信されている報知情報チャネルを受信し、セル毎の報知情報を取得する(ステップS22)。
最後に、受信した報知情報からGCID情報を取得し、記録し(ステップS23)、図8の処理を終了する。
まず、受信した衝突セルID情報をセルID管理部1073bに記録する(ステップS25)。
続いて、受信制御信号に基づく下りリファレンス信号が系列選択部1072bで選択される(ステップS26)。次に、系列選択部1072bで選択されたセルID(検出済みセルID)に、前記衝突セルID情報で指定されたセルID(衝突セルID)が含まれているかを判定する(ステップS27)。
衝突セルIDが含まれていない場合は(ステップS27で「NO」)、ステップS26の選択信号と、受信した下りリファレンス信号の抽出信号との相関処理を相関処理部1074bにて行い(ステップS29)、相関信号を出力する。
図10Bにおいて、移動局装置100は、衝突しているセルIDのセルの受信品質を報告する場合、セルID(例えば、CID_B)とGCID(例えば、GCID_B)と受信品質(品質情報_B)を1セットとして報告する。衝突していないセルIDについては、図10Aと同じ構成である。なお、品質情報の内容として、1種類以上の測定結果を含めるようにしても良い。
図11Aにおいて、基地局装置200は、少なくともセルIDとハンドオーバーで使用される制御パラメータを通知する。制御パラメータには、図11Aに示すように周波数情報、CID情報(例えば、CID_B)、プリアンブル情報、ハンドオーバー実行時間、上り送信タイミングが含まれている。なお、ハンドオーバー手順のために必要な制御パラメータであれば、これらの制御パラメータ以外のものを使用しても良い。
本実施形態によれば、移動局装置100から基地局装置200に対して衝突しているセルIDのGCIDに対応した受信品質の測定報告が行われる。そのため、移動局装置100はセルIDが衝突しているセルであっても、各セルの受信品質を報告することが可能となる。
また、衝突しているセルであっても、GCIDによって各々の品質情報を明示することが可能となり、基地局装置200に精度の高い測定結果を報告することが可能となる。これにより、不適切なハンドオーバーが抑制することができるため通信品質を向上させることができる。
また、ハンドオーバー時に、衝突しているセルのどちらに移動局装置100がハンドオーバーするか不明であるという不確実性を排除し、ハンドオーバーの成功確率を向上させることが可能となる。
次に、本発明の第3の実施形態について説明する。第3の実施形態による移動通信システムは、基地局装置と移動局装置を備えている。第3の実施形態による基地局装置と移動局装置の構成は、それぞれ第1の実施形態による基地局装置200(図2)と移動局装置100(図1)と同様であるため、それらの説明を省略する。
第3の実施形態は、ハンドオーバー指示メッセージ内に衝突セルID情報を含めることで、ハンドオーバー後にアクセスされるセルを識別可能な仕組みを提供する。
移動局装置100と在圏セル並びに周辺セルとの関係は図3と同じである。また、ハンドオーバー指示メッセージがソースセル(CID_A)から通知されるまでの処理(ステップS305、S306、S307)は、図6の処理(ステップS206、S207、S208)の処理と同じである。
また、測定報告処理における下りリファレンス信号の測定処理(ステップS301、S302、S303、S304)は、図19の処理(ステップS020、S021、S022、S023)と同じである。
衝突セルID情報を取得した移動局装置100は、ハンドオーバー時GCID取得処理を実施する(ステップS309)。ハンドオーバー時GCID取得処理とは、ハンドオーバー指示メッセージ内の衝突セルID情報によって通知されたセルID(図12ではCID_B)のセルから送信される報知情報チャネルの受信処理を行い、指定されたセルIDのセルに割り当てられているGCIDを取得する処理である。
ハンドオーバー指示メッセージにハンドオーバー実行時間が含まれている場合、移動局装置100は、ハンドオーバー実行時間に至る前にGCID取得処理を行い、ハンドオーバー実行時間に至った時点でハンドオーバーを実行する(ステップS312)。ハンドオーバー実行時間として、即時実行が指定された場合、またはGCID取得前にハンドオーバー実行時間に至った場合は、移動局装置100は、GCIDを取得した直後にハンドオーバーを実行する。
下り同期確立処理のための制御パラメータは、先のハンドオーバー指示メッセージに含まれるか、事前にソースセル(CID_A)から移動局装置100に報知または通知される。下り同期確立が完了した移動局装置100は、隣接セル(CID_B)との上り同期確立のために、ランダムアクセス送信を行う(ステップS313)。ステップS314、S315の処理は、図6のステップS212、S213の処理と同様であるため、それらの説明を省略する。
まず、移動局装置100は、受信した衝突セルID情報を記録する(ステップS31)。続いて、移動局装置100は、ステップS31で記録したセルIDのセルにて送信されている報知情報チャネルを受信し、セル毎の報知情報を取得する処理を行う(ステップS32)。最後に、移動局装置100は、受信した報知情報からGCID情報を取得し、記録する処理を行い(ステップS33)、図13に示す処理を終了する。
また、移動局装置100は衝突セルID情報をハンドオーバー指示メッセージで受信したときに、指定されたセルのGCIDのみを取得すれば良いため、衝突しているセルがないエリアでのハンドオーバー手順は通常と同じで良い。
また、ハンドオーバー時に、衝突しているセルのどちらに移動局装置100がハンドオーバーするか不明であるという不確実性を排除し、ハンドオーバーの成功確率を向上させることが可能となる。
次に、本発明の第4の実施形態について説明する。第4の実施形態による移動通信システムは、基地局装置と移動局装置を備えている。第4の実施形態による基地局装置と移動局装置の構成は、それぞれ第1の実施形態による基地局装置200(図2)と移動局装置100(図1)と同様であるため、それらの説明を省略する。
本実施形態は、基地局装置200間の送信タイミングが非同期である場合に好適である。しかし、基地局装置200間の送信タイミングが同期している場合にも適用することができる。
ソースセルは、測定前または測定中の移動局装置100に対して衝突セルID情報を通知する(ステップS401)。衝突セルID情報には、少なくともセルID(例えば、CID_B)とGCID(例えば、GCID_C)が含まれている。
更には、ソースセルから移動局装置100へ衝突セルID情報を通知可能であれば、それ以外の任意の物理チャネルやメッセージを用いても良い。
移動局装置100は、GCIDを受信し(ステップS403、S404)、衝突GCID例外処理を行う(ステップS405)。衝突GCID例外処理とは、衝突セルID情報で指示されたGCID(図14ではGCID_C)のセルに関する下りリファレンス信号の受信処理および受信品質測定を制限し、セル間の受信品質の判定に用いないように制御する処理、あるいは、衝突セルID情報で指示されたGCIDのセルの受信品質に基づくイベント(例えば、ハンドオーバー条件の成立など)の報告を抑制する処理である。
そして、衝突セルとなるGCIDのセルについては下りリファレンス信号の報告を制限する。移動局装置100は、衝突セルID例外処理として、衝突セルID情報で指示されたGCID(図14ではGCID_C)のセルに関する下りリファレンス信号の受信処理および受信品質測定を制限し、セル間の受信品質の判定に用いないように制御する。これにより、GCID_Cのセルの受信品質は測定報告処理(ステップS406)において測定報告メッセージに含まれずにソースセル(CID_A)に送信される(ステップS407)。
例えば、選択信号、相関信号、またはリファレンスデータを出力するときに衝突セルID情報で指定されたGCID(衝突セルID)のセルに該当する出力を制限する。なお、GCID取得処理は図8と同じ処理を使用することができる。
続いて、系列選択部1072bに入力されるセルID(検出済みセルID)に、前記衝突セルID情報で指定されたセルID(衝突セルID)が含まれているかを判定する(ステップS42)。
衝突セルIDが含まれていない場合、または指定されたGCIDでない場合は(ステップS42で「NO」、かつ、ステップS43で「NO」)、受信制御信号に基づく下りリファレンス信号が系列選択部1072bで選択される(ステップS45)。そして、ステップS45の選択信号と受信した下りリファレンス信号の抽出信号との相関処理を相関処理部1074bにて行い(ステップS46)、相関信号を出力する。
なお、本実施形態において、移動局装置100は衝突セルID情報で指定されたGCIDのセルの受信品質を除外するのではなく、指定されたGCID以外のセルの受信品質を除外するようにしても良い。
また、移動局装置100は衝突セルID情報を受信したときに、指定されたセルのGCIDのみを取得すれば良いため、衝突しているセルがないエリアでの測定処理手順は通常と同じ処理を使用することができる。
また、移動局装置100は、衝突しているセルIDのうち、指定されたGCIDのセルに関する不要な受信品質の測定をする必要がなくなる。更に、移動局装置100は、指定されたGCIDのセルに関する測定報告メッセージの送信を行わないため、消費電力の削減が可能となる。
Claims (13)
- 移動局装置と基地局装置とを備える移動通信システムであって、
前記基地局装置は、所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置が存在する場合において、前記同一の同期チャネルの無線信号を送信する基地局装置のセル識別情報を前記移動局装置に送信するセル識別情報送信部を備え、
前記移動局装置は、前記基地局装置のセル識別情報に基づく測定処理を行い、前記測定処理によって得られた測定結果を前記基地局装置に送信する測定結果送信部を備えることを特徴とする移動通信システム。 - 前記基地局装置のセル識別情報は、プライマリ同期チャネルとセカンダリ同期チャネルの組み合わせによって特定されるセル識別情報であることを特徴とする請求項1に記載の移動通信システム。
- 前記基地局装置のセル識別情報は、プライマリ同期チャネルとセカンダリ同期チャネルの組み合わせによって特定されるセル識別情報と、セル毎に一意に割り当てられるグローバルセル識別情報であることを特徴とする請求項1に記載の移動通信システム。
- 前記基地局装置のセル識別情報は、ハンドオーバー指示メッセージを用いて前記移動局装置に送信されることを特徴とする請求項1に記載の移動通信システム。
- 前記移動局装置の測定処理は、前記基地局装置のセル識別情報で指定されたセル以外の測定結果を含めることを特徴とする請求項1の移動通信システム。
- 前記移動局装置の測定処理は、前記基地局装置のセル識別情報で指定されたグローバルセル識別情報を持つ基地局装置の報知情報を取得し、同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置を各々識別することを特徴とする請求項1の移動通信システム。
- 移動局装置と基地局装置とを備える移動通信システムであって、
前記基地局装置は、所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置が存在する場合において、前記同一の同期チャネルの無線信号を送信する基地局装置のセル識別情報をハンドオーバー指示メッセージに含めて前記移動局装置に送信するセル識別情報送信部を備え、
前記移動局装置は、前記ハンドオーバー指示メッセージのセル識別情報で指定されたグローバルセル識別情報を持つ基地局装置の報知情報を取得し、同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置のグローバルセル識別情報を同定した後にハンドオーバー手順を開始するハンドオーバー処理部を備えることを特徴とする移動通信システム。 - 移動局装置と通信する基地局装置であって、
所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置が存在する場合において、前記同一の同期チャネルの無線信号を送信する基地局装置のセル識別情報を前記移動局装置に送信するセル識別情報送信部を備えることを特徴とする基地局装置。 - 基地局装置と通信する移動局装置であって、
前記基地局装置のセル識別情報に基づく測定処理を行い、前記測定処理によって得られた測定結果を前記基地局装置に送信する測定結果送信部を備えることを特徴とする移動局装置。 - 移動局装置と通信する基地局装置であって、
所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置が存在する場合において、前記同一の同期チャネルの無線信号を送信する基地局装置のセル識別情報をハンドオーバー指示メッセージに含めて前記移動局装置に送信するセル識別情報送信部を備えることを特徴とする基地局装置。 - 基地局装置と通信する移動局装置であって、
ハンドオーバー指示メッセージのセル識別情報で指定されたグローバルセル識別情報を持つ基地局装置の報知情報を前記基地局装置から取得し、同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置のグローバルセル識別情報を同定した後にハンドオーバー手順を開始するハンドオーバー処理部を備えることを特徴とする移動局装置。 - 移動局装置と基地局装置とを用いた移動通信方法であって、
前記基地局装置は、所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置が存在する場合において、前記同一の同期チャネルの無線信号を送信する基地局装置のセル識別情報を前記移動局装置に送信するセル識別情報送信過程を有し、
前記移動局装置は、前記基地局装置のセル識別情報に基づく測定処理を行い、前記測定処理によって得られた測定結果を前記基地局装置に送信する測定結果送信過程を有することを特徴とする移動通信方法。 - 移動局装置と基地局装置とを用いた移動通信方法であって、
前記基地局装置は、所定の通信範囲内に同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置が存在する場合において、前記同一の同期チャネルの無線信号を送信する基地局装置のセル識別情報をハンドオーバー指示メッセージに含めて前記移動局装置に送信するセル識別情報送信過程を有し、
前記移動局装置は、前記ハンドオーバー指示メッセージのセル識別情報で指定されたグローバルセル識別情報を持つ基地局装置の報知情報を取得し、同一の同期チャネルの無線信号を送信する少なくとも2つの基地局装置のグローバルセル識別情報を同定した後にハンドオーバー手順を開始するハンドオーバー処理過程を有することを特徴とする移動通信方法。
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JP2012515481A (ja) * | 2009-01-15 | 2012-07-05 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | セルサーチを実行する方法及び装置 |
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CN103024890A (zh) * | 2011-09-20 | 2013-04-03 | 中兴通讯股份有限公司 | 辅小区的上行同步方法、基站和终端 |
CN103024890B (zh) * | 2011-09-20 | 2017-02-08 | 中兴通讯股份有限公司 | 辅小区的上行同步方法、基站和终端 |
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JP2015528246A (ja) * | 2012-08-03 | 2015-09-24 | インテル コーポレイション | 拡張された物理下りリンク制御チャネルのスクランブリング及び復調用参照信号系列の生成 |
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Also Published As
Publication number | Publication date |
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EP2753115A2 (en) | 2014-07-09 |
EP2753115A3 (en) | 2015-05-27 |
US8625540B2 (en) | 2014-01-07 |
HK1147633A1 (en) | 2011-08-12 |
JPWO2009098960A1 (ja) | 2011-05-26 |
BRPI0908462B1 (pt) | 2020-10-20 |
CA2713854A1 (en) | 2009-08-13 |
US20140098788A1 (en) | 2014-04-10 |
CN101926197A (zh) | 2010-12-22 |
EA201070815A1 (ru) | 2011-02-28 |
EP2242305B1 (en) | 2014-07-09 |
CA2713854C (en) | 2014-06-10 |
JP4646337B2 (ja) | 2011-03-09 |
ES2500615T3 (es) | 2014-09-30 |
EP2753115B1 (en) | 2016-04-27 |
MX2010008504A (es) | 2010-08-30 |
EP2242305A4 (en) | 2012-05-23 |
US8989153B2 (en) | 2015-03-24 |
KR20100110850A (ko) | 2010-10-13 |
KR101154780B1 (ko) | 2012-06-18 |
AU2009212613B2 (en) | 2012-09-13 |
AU2009212613A1 (en) | 2009-08-13 |
BRPI0908462A2 (pt) | 2017-09-26 |
EA022231B1 (ru) | 2015-11-30 |
EP2242305A1 (en) | 2010-10-20 |
US20110013592A1 (en) | 2011-01-20 |
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