WO2010079825A1 - 試験方法及び試験装置 - Google Patents
試験方法及び試験装置 Download PDFInfo
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- WO2010079825A1 WO2010079825A1 PCT/JP2010/050148 JP2010050148W WO2010079825A1 WO 2010079825 A1 WO2010079825 A1 WO 2010079825A1 JP 2010050148 W JP2010050148 W JP 2010050148W WO 2010079825 A1 WO2010079825 A1 WO 2010079825A1
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- WIPO (PCT)
- Prior art keywords
- mobile station
- state
- radio link
- downlink
- uplink signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
Definitions
- the present invention relates to a test method and a test apparatus.
- a mobile communication system is configured to monitor a synchronization state between a radio base station and a mobile station.
- a synchronization state between a radio base station and a mobile station.
- the following two indices are defined in order to determine the downlink synchronization state in the physical layer.
- DPCCH quality is a pilot symbol (Pilot symbol) or transmission power control (TPC: transmission power control)
- IR reception quality for example, S, n -to-interference power ratio
- reception level for example, S, n -to-interference power ratio
- the mobile station determines the downlink synchronization state based on, for example, the DPCCH radio quality.
- a test is applied to a mobile station and a radio base station in order to ensure the communication quality.
- DPCCH_Ec / Ior is the DPCCH power level and corresponds to the DPCCH radio quality.
- Qin and Qout are threshold values for determining the downlink synchronization state.
- the state in which the downlink synchronization state is OK is referred to as “In-sync (In-Synchronous)”, and the state in which the downlink synchronization state is NG is referred to as “Out-of-Sync (Out-of-Synchronous). ) ".
- a state in which a radio link state problem is not detected may be referred to as “In-sync”, and a state in which a radio link state problem is detected may be referred to as “Out-of-sync”.
- the DPCCH radio quality is changed from a state higher than a predetermined threshold value Qout to a lower state, and at time C, the mobile station stops the uplink signal. To confirm that the mobile station is normally determining the downlink synchronization state.
- the mobile station when the mobile station detects Out-of-sync, the mobile station performs an operation of stopping the uplink signal. Therefore, at time C, the mobile station confirms the operation of stopping the uplink signal. By doing so, it is confirmed that the mobile station is detecting Out-of-sync normally.
- time difference from time B to time C is set to take into account the determination delay in the mobile station.
- the radio quality of the DPCCH is changed from a state lower than a predetermined threshold value Qin to a high state, and at time F, the mobile station transmits an uplink signal. Confirm that the downlink synchronization status is correctly determined.
- the mobile station confirms the operation that the mobile station is transmitting the uplink signal at time F because the mobile station performs the operation of starting the transmission of the uplink signal when In-sync is detected. By doing this, it is confirmed that the mobile station is detecting In-sync normally.
- time difference from time E to F is set in order to take into account the determination delay in the mobile station.
- the mobile station when the radio quality of the DPCCH is changed and the radio quality of the DPCCH becomes equal to or less than Qout, the mobile station When the mobile station stops uplink transmission and the radio quality of the DPCCH is equal to or higher than Qin, the mobile station normally performs downlink synchronization state determination operation based on the start of uplink transmission. Had confirmed that.
- test method described above may not be applicable.
- the mobile station determines the failure of the radio link state at the RRC layer, not at the time of determining the downlink synchronization state at the physical layer. At this point, the uplink signal is stopped.
- LTE Long Term Evolution
- WCDMA Long Term Evolution
- the present invention has been made in view of the above-described problem, and when a failure of the radio link state is detected in the RRC layer, the mobile station is also downloaded even when the connection state reconstruction process is started. It is an object of the present invention to provide a test method and a test apparatus that make it possible to confirm whether or not the synchronization state of a link is normally detected.
- a first feature of the present invention is a test method for confirming a radio link state problem detecting means in a mobile station, wherein the radio quality is higher than or equal to a first threshold value from the first state.
- the second step is to include the second step.
- the mobile station You may determine whether it detected.
- the mobile station in the first step and the second step, detects a problem of the radio link state when the mobile station is transmitting an uplink signal. If the mobile station is not transmitting an uplink signal, it may be determined that the mobile station has detected a problem with the radio link state.
- the uplink signal may be an uplink signal transmitted periodically.
- the uplink signal may be a sounding reference signal or a control signal notifying a downlink radio quality state.
- the first time interval starts a process of reconstructing a connection state activated from the time when the mobile station detects the radio link state problem It may be the same as the timer value for
- the mobile station in the first step, when the mobile station detects a problem of the radio link state, it may be determined that the mobile station is operating normally.
- the mobile station when the mobile station does not detect the problem of the radio link state in the second step, it may be determined that the mobile station is operating normally.
- a second feature of the present invention is a test apparatus for confirming radio link state problem detection means in a test apparatus mobile station, wherein the radio quality is lower than the first threshold value from the first state that is equal to or higher than the first threshold value.
- a first determination unit configured to determine whether or not the mobile station detects the problem of the radio link state when the mobile station changes to a second state; and the radio quality is changed from the first state to the Whether or not the mobile station does not detect the problem of the radio link state when the radio quality is changed to the third state that is equal to or higher than the second threshold after the first time interval has elapsed since the change to the second state.
- a second determining unit configured to determine whether or not.
- the mobile station when a failure of the radio link state is detected in the RRC layer, even when the connection state rebuilding process is started, the mobile station keeps the downlink synchronization state normal.
- the test method and a test apparatus that make it possible to confirm whether or not the detection has occurred.
- FIG. 1 is a diagram illustrating a method for determining a downlink synchronization state in the WCDMA system.
- FIG. 2 is a diagram illustrating a configuration of the test system according to the present embodiment.
- FIG. 3 is a diagram illustrating a configuration of the mobile station according to the present embodiment.
- FIG. 4 is a diagram for explaining the determination of the downlink synchronization state in the mobile station according to the present embodiment.
- FIG. 5 is a diagram for explaining how the radio link failure state is detected in the mobile station according to the present embodiment.
- FIG. 6 is a diagram for explaining a state of In-sync detection in the mobile station according to the present embodiment.
- FIG. 7 is a diagram showing the configuration of the test apparatus according to the present embodiment.
- FIG. 1 is a diagram illustrating a method for determining a downlink synchronization state in the WCDMA system.
- FIG. 2 is a diagram illustrating a configuration of the test system according to the present embodiment.
- FIG. 3 is
- FIG. 8 is a diagram showing a test method according to the present embodiment.
- FIG. 9 is a diagram illustrating a test method according to the present embodiment.
- FIG. 10 is a flowchart showing a test method according to the present embodiment.
- FIG. 11 is a flowchart showing a test method according to this embodiment.
- the test system is a test system based on an LTE mobile communication system, and is a test system for confirming the operation of a mobile station in the LTE mobile communication system. is there.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single-Carrier Division Multiple Access
- the OFDM scheme is a scheme in which a specific frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each frequency band. According to the OFDM scheme, high-speed transmission can be realized and frequency utilization efficiency can be improved by arranging subcarriers closely without interfering with each other while partially overlapping on the frequency axis.
- the SC-FDMA scheme can reduce interference between a plurality of mobile stations UE by dividing a specific frequency band and transmitting using a different frequency band between the plurality of mobile stations UE. Transmission method. According to the SC-FDMA scheme, since the variation in transmission power is small, it is possible to realize low power consumption and wide coverage of the mobile station UE.
- the test apparatus 200 transmits a downlink control signal to the mobile station 100 via the physical downlink control channel PDCCH (Physical Downlink Control Channel), and the physical downlink shared channel PDSCH ( It is configured to transmit a downlink data signal via Physical Downlink Shared Channel).
- PDCCH Physical Downlink Control Channel
- PDSCH Physical Downlink shared channel
- the test apparatus 200 is configured to transmit a Downlink Reference Signal (DL RS) that is a downlink pilot signal.
- DL RS Downlink Reference Signal
- an interference signal is transmitted from the interference signal generation device 300 to the mobile station 100.
- the radio quality of PDCCH, PDSCH, and DL RS at the receiving end of mobile station 100 is improved. Adjusted.
- the wireless quality is, for example, SIR (Signal-to-Interference Ratio).
- the mobile station 100 is configured to transmit an uplink data signal via a physical uplink shared channel PUSCH (Physical Uplink Shared Channel) in the uplink.
- PUSCH Physical Uplink Shared Channel
- the mobile station 100 is configured to transmit an uplink control signal via a physical uplink control channel PUCCH (Physical Uplink Control Channel) in the uplink.
- PUCCH Physical Uplink Control Channel
- the mobile station 100 is configured to transmit a random access preamble via a physical random access channel (PRACH) in the uplink.
- PRACH physical random access channel
- the uplink control signal includes downlink radio quality information (Channel Quality Indication (CQI) or Precoding Matrix Indication (PMI) or Rank Indication (RI)), a scheduling request, and delivery confirmation information (ACK information for PDSCH). ) Etc. are included.
- CQI Click Quality Indication
- PMI Precoding Matrix Indication
- RI Rank Indication
- ACK information for PDSCH delivery confirmation information
- the mobile station 100 is configured to transmit a sounding reference signal Sounding Reference Signal (Sounding RS) in the uplink.
- Sounding RS Sounding Reference Signal
- test apparatus 200 the test apparatus 200, the mobile station 100, and the interference signal generation apparatus 300 are connected by wire, but may be connected wirelessly instead of by wire.
- an apparatus such as a fading simulator may be additionally connected.
- a fading simulator When such a fading simulator is connected, a test under a fading environment can be applied.
- the test apparatus 200 may set a reconnection destination cell in addition to the cell with which the mobile station 100 communicates first so that the mobile station 100 can perform reconnection processing.
- the mobile station 100 searches for the reconnection destination cell by performing a cell search, and then performs a random access procedure on the reconnection destination cell. Thus, the reconnection process is performed.
- the reconnection destination cell may be, for example, another cell having the same frequency as the cell with which the mobile station 100 initially communicates, or may be another cell having a different frequency. Further, the reconnection destination cell may include different sectors in the same base station with respect to the cell with which the mobile station 100 communicates first. In any case, the UE Context related to the mobile station 100 is held in the reconnection destination cell.
- the mobile station 100 includes a synchronization state determination unit 102, a radio link failure state determination unit 104, a reconnection processing unit 106, and an uplink signal transmission unit 108.
- the synchronization state determination unit 102 is configured to measure the downlink wireless quality in the mobile station 100 and determine the downlink synchronization state based on the wireless quality.
- the downlink radio quality in the mobile station 100 is the quality of the radio link between the test apparatus 200 and the mobile station UE.
- the test apparatus 200 corresponds to the radio base station eNB in a mobile communication system to which the LTE scheme is applied.
- the synchronization state determination unit 102 measures the SIR of the downlink signal (eg, reference signal (DL RS)) of the mobile station 100 as the downlink radio quality in the mobile station UE, and based on the SIR The downlink synchronization state may be determined.
- the SIR of the downlink signal eg, reference signal (DL RS)
- DL RS reference signal
- the synchronization state determination unit 102 determines that the downlink synchronization state is OK, that is, In-sync, and the SIR is the predetermined threshold. In the following cases, it may be determined that the downlink synchronization state is NG, that is, Out-of-sync.
- the synchronization state determination unit 102 may set two threshold values of Qout and Qin, and determine the downlink synchronization state based on the above-described SIR, Qout, and Qin. .
- the synchronization state determination unit 102 may use a value obtained by averaging the instantaneous SIR in a predetermined averaging section as the above-described SIR value.
- the predetermined averaging period may be, for example, 160 ms, 200 ms, 20 ms, or other values.
- the SIR value may be a value averaged over the entire system band in the frequency direction, or may be a value averaged over a part of the system band.
- the partial band in the system band may be a band having a predetermined bandwidth located at the center of the system band, for example.
- the partial band in the system band may be a band in which a synchronization signal or a physical broadcast channel is transmitted, for example.
- the synchronization state determination unit 102 notifies the wireless link failure state determination unit 104 of the downlink synchronization state determination result (In-sync / Out-of-sync) described above.
- the synchronization state determination unit 102 may notify the radio link failure state determination unit 104 of the downlink synchronization state determination result (In-sync / Out-of-sync) described above every 10 ms.
- the above 10 ms is merely an example, and may be a value other than 10 ms.
- the synchronization state determination unit 102 transmits the downlink synchronization state determination result (In-sync / Out-of-sync) described above for each radio link frame (Radio Link Frame). May be notified.
- the synchronization state determination unit 102 uses the SIR of the reference signal (Reference Signal) as the downlink radio quality. Instead, the received power of the reference signal (Reference Signal Received Power (RSRP)). ), Reference Signal Received Quality (RSRQ), or CQI may be used.
- RSRP Reference Signal Received Power
- RSRQ Reference Signal Received Quality
- CQI CQI
- the synchronization state determination unit 102 uses the PDCCH error rate, the PCFICH error rate, the PCFICH SIR, the PDSCH error rate, the DL RS symbol error rate, etc., instead of the reference signal SIR. Also good.
- PCFICH Physical Control Format Indicator Channel
- PCFICH Physical Control Format Indicator Channel
- the synchronization state determination unit 102 may determine, as downlink radio quality, the SIR of the reference signal (Reference Signal), the received power of the reference signal, the RSRQ, the CQI, the PDCCH error rate, the PCFICH error rate, PCFICH SIR, PDSCH error rate, or DL RS symbol error rate may be used.
- RSRQ Reference Signal Received Quality Power
- RSSI Received Signal Strength Indicator
- RSSI is a total reception level observed in a mobile station, and includes a reception level including all of thermal noise, interference power from other cells, power of a desired signal from its own cell, and the like. is there.
- CQI Channel Quality Indication
- the radio link failure state determination unit 104 determines whether or not a radio link failure state (RLF) is based on the downlink synchronization state determination result in the synchronization state determination unit 102 described above. It is configured.
- RLF radio link failure state
- the radio link failure state determination unit 104 starts the timer T310 when the synchronization state determination unit 102 reports Out-of-sync for N310 times consecutively, and the timer T310 expires.
- the wireless link failure state may be determined.
- a notification indicating Out-of-sync is received as the link synchronization state.
- the timer T310 is equivalent to a timer for starting a process for reestablishing a connection state, which is started when the mobile station detects a radio link state problem.
- the notification of In-sync is received as the downlink synchronization state N311 times continuously.
- N310 and N311 are thresholds related to the number of times Out-of-sync or In-sync is continuously notified, but instead, Out-of-sync or In-sync is continuous. It may be a threshold regarding the time notified.
- N310 and N311 may be treated as a timer in the same manner as T310. That is, N311 and N311 described above may be the number of times that the synchronization state is notified from the synchronization state determination unit 102 as a unit, or instead, the time when the synchronization state is notified from the synchronization state determination unit 102. There may be.
- the wireless link failure state determination unit 104 determines that the state is a radio link failure state
- the wireless link failure state determination unit 104 notifies the reconnection processing unit 106 and the uplink signal transmission unit 108 of the determination result.
- radio link failure state determination unit 104 notifies the reconnection processing unit 106 and the uplink signal transmission unit 108 of the result that the timer T310 has expired, instead of notifying the result of determination that the wireless link failure state has occurred. May be.
- the reconnection processing unit 106 performs reconnection processing when the wireless link failure state determination unit 104 is notified of the determination result that the wireless link failure state is present.
- the reconnection processing unit 104 may clear the communication setting (Configuration) between the mobile station 100 and the test apparatus 200 before performing the reconnection process.
- Cell Update process means, for example, cell search, measurement of the wireless quality of the searched cell, etc., and when there is a communicable cell, connection establishment is performed again for the cell. Point to.
- a random access procedure (random access procedure) is performed on the cell. That is, when reestablishing a connection to the cell, the mobile station first transmits a random access preamble to the cell via the PRACH.
- Cell Update process may be referred to as a “Connection Re-establishment process”.
- the reconnection processing unit 106 may perform reconnection processing when the wireless link failure state determination unit 104 is notified of the result that the timer T310 has expired.
- the uplink signal transmission unit 108 transmits an uplink signal to the test apparatus 200 in the uplink.
- the uplink signal includes, for example, PUSCH, PUCCH, a sounding reference signal, and the like.
- PUSCH PUSCH
- PUCCH Physical Uplink Control Channel
- RI RI
- the like which are downlink radio quality information, may be transmitted by the PUCCH.
- the uplink signal transmission unit 108 stops the transmission of the uplink signal when the radio link failure state determination unit 104 is notified of the determination result that the radio link failure state is present.
- the uplink signal transmission unit 108 may stop the transmission of the uplink signal when notified from the radio link failure state determination unit 104 that the timer T310 has expired.
- the uplink signal transmission unit 108 uses the PRACH for the communicable cell when reestablishing the connection to the communicable cell in the reconnection process.
- a random access preamble may be transmitted.
- the mobile station 100 transmits PUSCH or PUCCH in the uplink is shown, but instead, the operation when the mobile station 100 does not transmit PUSCH or PUCCH will be described below.
- the mobile station 100 when uplink timing synchronization (Uplink Time Alignment) is not maintained, or when discontinuous reception control (DRX) is applied, the mobile station 100 is basically In addition, the uplink signals described above, that is, PUSCH and PUCCH are not transmitted.
- the uplink signal transmission unit 108 does not transmit the above-described PUSCH, PUCCH, sounding reference signal, or the like, and transmits the random access preamble via the PRACH in the above-described reconnection processing. It may be configured to perform.
- the test apparatus 200 includes a downlink signal transmission unit 202, a signal power adjustment unit 204, an uplink signal reception unit 206, and a mobile station operation determination unit 208.
- the downlink signal transmission unit 202 is configured to transmit a downlink signal to the mobile station 100.
- Such downlink signals include PDSCH, PDCCH, DL RS, PCFICH, and the like.
- the downlink signal transmission unit 202 sets the downlink signal power based on information on the signal power notified from the signal power adjustment unit 204 described later, and the downlink signal power based on the downlink signal power. Transmit link signals.
- the signal power adjustment unit 204 adjusts the signal power of the downlink signal so that the radio quality at the receiving end of the mobile station 100 is set to a predetermined value, and the adjusted result is used as information regarding the signal power. And notifies the downlink signal transmission section 202.
- the signal power adjustment unit 204 When adjusting the transmission power of the downlink signal, the signal power adjustment unit 204 notifies the mobile station operation determination unit 208 of the downlink radio quality at the receiving end of the mobile station at each time, as will be described later. Based on the above, the transmission power of the downlink signal at each time may be adjusted.
- the power of the interference signal from the interference signal generation device 300 is fixed, and the signal power adjustment unit 204 adjusts the signal power of the downlink signal, so that the mobile station 100 as described above
- the radio quality of the downlink signal at the receiving end may be adjusted.
- the signal power of the downlink signal set in the signal power adjustment unit 204 is fixed, and the power of the interference signal from the interference signal generation device 300 is adjusted, so that the reception end of the mobile station 100 as described above
- the radio quality of the downlink signal may be adjusted.
- the downlink power at the receiving end of the mobile station 100 is adjusted by adjusting both the signal power of the downlink signal set in the signal power adjustment unit 204 and the power of the interference signal from the interference signal generation device 300.
- the radio quality of the signal may be adjusted.
- the uplink signal receiving unit 206 receives an uplink signal transmitted from the mobile station 100.
- the uplink signal includes, for example, PUSCH, PUCCH, Sounding RS, and the like.
- the uplink signal reception unit 206 receives a random access preamble transmitted from the mobile station 100.
- the uplink signal reception unit 206 measures the quality of the uplink signal transmitted from the mobile station 100 (for example, signal power, SIR, etc.), so that the mobile station 100 transmits the uplink signal. It is determined whether or not. Note that if it is possible to accurately determine whether or not the mobile station 100 is transmitting an uplink signal, whether or not the mobile station 100 is transmitting an uplink signal using a method other than the above. You may judge.
- the uplink signal reception unit 206 notifies the mobile station operation determination unit 208 of information about whether or not the mobile station 100 is transmitting an uplink signal.
- the uplink signal receiving unit 206 when receiving the random access preamble transmitted from the mobile station 100, notifies the mobile station operation determining unit 208 of information that the mobile station 100 has transmitted the random access preamble.
- the uplink signal reception unit 206 may receive the random access preamble as a communicable cell in the reconnection process described above.
- the uplink signal reception unit 206 may receive the random access preamble as a cell different from the cell with which the mobile station 100 originally communicated, for example.
- the cell different from the cell with which the mobile station 100 originally communicated may be, for example, another cell having the same frequency, or another cell having a different frequency. Further, the different cell may include different sectors in the same base station.
- the mobile station operation determination unit 208 determines whether or not the mobile station 100 is normally determining the downlink synchronization state, that is, whether or not the mobile station 100 is normally having a problem in the downlink radio link. To do.
- the mobile station operation determination unit 208 is based on information about whether or not the mobile station 100 is transmitting an uplink signal, notified from the uplink signal transmission unit 108. It is determined whether or not is normally determining the downlink synchronization state.
- the mobile station operation determination unit 208 changes the downlink radio quality at the receiving end of the mobile station over time, so that the mobile station 100 can properly operate the downlink. It is determined whether or not the synchronization state is determined.
- the mobile station operation determination unit 208 notifies the radio power of the downlink at the reception end of the mobile station at each time to the signal power adjustment unit 204, thereby determining the downlink radio quality at the reception end of the mobile station. You may change with time.
- N310 is set to 0, and timer T310 is set to “0 ms”.
- the mobile station 100 is set to transmit a periodic signal.
- the periodic signal may be, for example, a PUCCH for transmitting Sounding RS or CQI / PMI / RI.
- the periodic signal transmission cycle may be 2 ms.
- the periodic signal transmission period may be a value other than 2 ms, but is preferably as small as possible.
- the mobile station operation determination unit 208 changes the downlink radio quality from a state larger than Qout to a state smaller than Qout.
- the mobile station operation determination unit 208 determines whether or not the mobile station 100 has normally determined the downlink synchronization state based on whether or not the mobile station 100 is transmitting an uplink signal. judge.
- the mobile station operation determination unit 208 determines that the mobile station 100 has detected Out-of-sync when the mobile station 100 has not transmitted an uplink signal, and the mobile station 100 100 determines that the downlink synchronization state is normally determined, and the mobile station 100 is detecting an out-of-sync when the mobile station 100 is transmitting an uplink signal. It is determined that the mobile station 100 does not normally determine the downlink synchronization state.
- the downlink radio quality becomes lower than Qout. Is based on an operation of determining a radio link failure state and stopping transmission of an uplink signal.
- time from time B to time C is a time considering the processing delay in the mobile station 100.
- the value of N310 is set to “0” and the value of timer T310 is set to “0 ms”, but values other than those described above may be used.
- the time C is set based on the values of N310 and T310.
- the processing of the mobile station operation determination unit 208 when the mobile station 100 transmits PUSCH or PUCCH in the uplink is shown.
- movement determination part 208 in is shown.
- the case where PUSCH or PUCCH is not transmitted is, for example, when uplink timing synchronization (Uplink Time Alignment) is not maintained, or when intermittent reception control (DRX: Discontinuous Reception Control) is applied. is there.
- uplink timing synchronization Uplink Time Alignment
- DRX Discontinuous Reception Control
- the mobile station operation determination unit 208 determines whether the mobile station 100 normally determines the downlink synchronization state based on whether or not the mobile station 100 transmits an uplink signal at time C. Instead of determining whether or not, the mobile station 100 determines whether or not the mobile station 100 has normally determined the downlink synchronization state based on whether or not the mobile station 100 has transmitted a random access preamble.
- the mobile station operation determination unit 208 determines that the mobile station 100 has detected Out-of-sync, 100 determines that the downlink synchronization state is normally determined, and when the mobile station 100 determines that the random access preamble has not been transmitted, the mobile station 100 detects Out-of-sync. It is determined that the mobile station 100 has not normally determined the downlink synchronization state.
- N310 and N311 are set to “0”, and the timer T310 is set to a time interval from time B to time F.
- the time F is set to be the time when the timer T310 has elapsed from the time B.
- the time interval from time B to time C is set to be the same as the time interval from time F to time G.
- the mobile station 100 is set to transmit a periodic signal.
- the periodic signal may be, for example, a PUCCH for transmitting Sounding RS or CQI / PMI / RI.
- the transmission period of such a periodic signal may be 2 ms.
- the periodic signal transmission period may be a value other than 2 ms, but is preferably as small as possible.
- the mobile station operation determination unit 208 changes the downlink radio quality from a state larger than Qout to a state smaller than Qout.
- the mobile station operation determination unit 208 changes the downlink radio quality from a state smaller than Qin to a state larger than Qin.
- the mobile station operation determination unit 208 determines whether or not the mobile station 100 has normally determined the downlink synchronization state based on whether or not the mobile station 100 is transmitting an uplink signal. judge.
- the mobile station operation determination unit 208 determines that the mobile station 100 detects In-sync, and the mobile station 100 100 determines that the downlink synchronization state is normally determined, and the mobile station 100 does not transmit an uplink signal, the mobile station 100 does not detect In-sync. The mobile station 100 determines that the downlink synchronization state is not normally determined.
- the values of N310 and N311 are “0”, and the timer T310 is set to the time interval from time B to time F, so that the downlink radio quality is Qout.
- the mobile station 100 starts the timer T310 at the moment when it becomes smaller than that, and stops the timer T310 at the moment when the downlink radio quality becomes larger than Qin while the timer T310 is running. Is based.
- the timer T310 is not stopped, so that the timer T310 is considered to expire by time G.
- the uplink signal is not transmitted at the time G as a result.
- time from time E to time F is a time considering the processing delay in the mobile station 100.
- the values of N310 and N311 are set to 0, and the value of timer T310 is set to the time interval from time B to time F.
- the time G is set based on the values of N310, N311, and T310.
- the processing of the mobile station operation determination unit 208 when the mobile station 100 transmits PUSCH or PUCCH in the uplink is shown.
- movement determination part 208 in is shown.
- the case where PUSCH or PUCCH is not transmitted is, for example, when uplink timing synchronization (Uplink Time Alignment) is not maintained, or when intermittent reception control (DRX: Discontinuous Reception Control) is applied. is there.
- uplink timing synchronization Uplink Time Alignment
- DRX Discontinuous Reception Control
- the mobile station operation determination unit 208 determines whether the mobile station 100 normally determines the downlink synchronization state based on whether or not the mobile station 100 transmits an uplink signal at time G. Instead of determining whether or not, the mobile station 100 determines whether or not the mobile station 100 has normally determined the downlink synchronization state based on whether or not the mobile station 100 has transmitted a random access preamble.
- the mobile station operation determination unit 208 determines that the mobile station 100 has detected In-Sync when the mobile station 100 determines that it has not transmitted the random access preamble, When the station 100 determines that the downlink synchronization state is normally determined and the mobile station 100 determines that the random access preamble has been transmitted, the mobile station 100 has not detected In-sync. The mobile station 100 determines that the downlink synchronization state has not been normally determined.
- a method for determining whether or not the mobile station 100 normally determines the downlink synchronization state based on whether or not the mobile station 100 transmits an uplink signal at the time G described above is as follows. It is assumed that the timer T310 is activated between time B and time C.
- the operation that the mobile station 100 starts the timer T310 between time B and time C is considered to be guaranteed by the test method described above with reference to FIG.
- the test apparatus 200 determines whether or not the mobile station 100 has normally determined the downlink synchronization state based on whether or not the mobile station 100 is transmitting an uplink signal. However, instead, it may be determined whether the mobile station 100 has normally determined the downlink synchronization state based on whether the mobile station 100 has performed reconnection processing. .
- the state in which the mobile station 100 is transmitting an uplink signal corresponds to the state in which the mobile station 100 has not performed reconnection processing, and the mobile station 100 is transmitting an uplink signal.
- a test method (operation) for confirming that the mobile station 100 appropriately determines the downlink synchronization state when the mobile station 100 changes from a good radio quality state to a poor situation will be described with reference to FIG. .
- step S1002 the test apparatus 200 changes the radio quality at the downlink receiving end in the mobile station 100 from a state higher than Qout to a state lower than Qout.
- step S1004 the test apparatus 200 determines whether or not the mobile station 100 is transmitting an uplink signal.
- test apparatus 200 may determine whether or not the mobile station 100 has performed reconnection processing instead of whether or not the mobile station 100 is transmitting an uplink signal.
- the operation of transmitting the uplink signal corresponds to the operation of not performing the reconnection process, and the operation of not transmitting the uplink signal performed the reconnection process. Corresponds to the operation.
- step S1004 When the mobile station 100 is transmitting an uplink signal (step S1004: YES), the process proceeds to step S1006.
- step S1006 the test apparatus 200 determines that the mobile station 100 has not normally determined the downlink synchronization state.
- step S1004 When the mobile station 100 is not transmitting an uplink signal (step S1004: NO), the process proceeds to step S1008.
- step S1008 the test apparatus 200 determines that the mobile station 100 has normally determined the downlink synchronization state.
- a test method (operation) for confirming that the mobile station 100 appropriately determines the downlink synchronization state when the mobile station 100 changes from a poor radio quality state to a good situation will be described with reference to FIG. .
- step S1102 the test apparatus 200 changes the radio quality at the downlink receiving end in the mobile station 100 from a state higher than Qout to a state lower than Qout.
- step S1104 the test apparatus 200 changes the radio quality at the downlink receiving end in the mobile station 100 from a state lower than Qin to a state higher than Qin when the timer T310 has elapsed from the time point in step S1102. .
- step S1106 the test apparatus 200 determines whether or not the mobile station 100 is transmitting an uplink signal.
- test apparatus 200 may determine whether or not the mobile station 100 has performed reconnection processing instead of whether or not the mobile station 100 is transmitting an uplink signal.
- the operation of transmitting the uplink signal corresponds to the operation of not performing the reconnection process, and the operation of not transmitting the uplink signal performed the reconnection process. Corresponds to the operation.
- step S1106 When the mobile station 100 is not transmitting an uplink signal (step S1106: NO), the process proceeds to step S1108.
- step S1108 the test apparatus 200 determines that the mobile station 100 has not normally determined the downlink synchronization state.
- step S1106 When the mobile station 100 is transmitting an uplink signal (step S1106: NO), the process proceeds to step S1110.
- step S1110 the test apparatus 200 determines that the mobile station 100 has normally determined the downlink synchronization state.
- test apparatus 200 may be performed by hardware, may be performed by a software module executed by a processor, or may be a combination of both. May be implemented.
- Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium such as a CD-ROM.
- the storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the test apparatus 200, the mobile station 100, or the interference signal generation apparatus 300. Further, the storage medium and the processor may be provided in the test apparatus 200, the mobile station 100, and the interference signal generation apparatus 300 as discrete components.
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Abstract
Description
・ 巡回冗長検査(CRC(Cyclic Redundancy Check) check)結果
ここで、「DPCCH quality」は、パイロットシンボル(Pilot symbols)や送信電力制御(TPC: transmission power control)ビットの受信品質、例えば、SIR(signal-to-interference power ratio)や受信レベルに相当し、「CRC check結果」は、ブロックエラーレート(Block error rate)に相当する。
図2を参照して、本発明の第1の実施形態に係る試験システムの構成について説明する。
図10及び図11を参照して、本発明の第1の実施形態に係る試験システムの動作について説明する。
本発明の第1の実施形態に係る移動通信システムによれば、移動局が、RRCレイヤで無線リンク状態の失敗を検出した時点で、接続状態の再構築の処理を開始する場合にも、移動局が下りリンクの同期状態を正常に検出しているか否かを確認することができ、結果として、移動局の動作品質を保証することが可能となり、結果として、移動通信システムにおける通信品質の安定、更にはユーザ利便性を向上することができる。
Claims (10)
- 移動局における無線リンク状態の問題検出手段を確認する試験方法であって、
無線品質を第1閾値以上である第1状態から前記第1閾値以下である第2状態に変更した場合に、前記移動局が前記無線リンク状態の問題を検出するか否かについて判定する第1工程と、
前記無線品質を前記第1状態から前記第2状態に変更した時点から第1時間間隔経過した後に、前記無線品質を第2閾値以上である第3状態に変更した場合に、前記移動局が前記無線リンク状態の問題を検出しないか否かについて判定する第2工程とを有することを特徴とする試験方法。 - 前記第1工程及び前記第2工程において、
前記移動局が上りリンクの信号を送信しているか否かに基づいて、前記移動局が前記無線リンク状態の問題を検出したか否かについて判定することを特徴とする請求項1に記載の試験方法。 - 前記第1工程及び前記第2工程において、
前記移動局が上りリンクの信号を送信している場合に、前記移動局が前記無線リンク状態の問題を検出していないと判定し、
前記移動局が上りリンクの信号を送信していない場合に、前記移動局が前記無線リンク状態の問題を検出したと判定することを特徴とする請求項2に記載の試験方法。 - 前記上りリンクの信号は、周期的に送信される上りリンクの信号であることを特徴とする請求項3に記載の試験方法。
- 前記上りリンクの信号は、サウンディング用の参照信号又は下りリンクの無線品質状態を通知する制御信号であることを特徴とする請求項4に記載の試験方法。
- 前記第2工程において、
前記第1時間間隔は、前記移動局が前記無線リンク状態の問題を検出した時点から起動される接続状態の再構築を行う処理を開始するためのタイマーの値と同一であることを特徴とする請求項1に記載の試験方法。 - 前記第1工程において、
前記移動局が前記無線リンク状態の問題を検出した場合に、前記移動局が正常に動作したと判定することを特徴とする請求項1に記載の試験方法。 - 前記第2工程において、
前記移動局が前記無線リンク状態の問題を検出しなかった場合に、前記移動局が正常に動作したと判定することを特徴とする請求項1に記載の試験方法。 - 前記第2工程において、
前記移動局がCQIの送信を停止せずにCQIを送信している場合に、前記移動局が前記無線リンク状態の問題を検出していないと判定し、前記移動局が正常に動作したと判定することを特徴とする請求項2に記載の試験方法。 - 移動局における無線リンク状態の問題検出手段を確認する試験装置であって、
無線品質を第1閾値以上である第1状態から前記第1閾値以下である第2状態に変更した場合に、前記移動局が前記無線リンク状態の問題を検出するか否かを判定するように構成されている第1判定部と、
前記無線品質を前記第1状態から前記第2状態に変更した時点から第1時間間隔経過した後に、前記無線品質を第2閾値以上である第3状態に変更した場合に、前記移動局が前記無線リンク状態の問題を検出しないか否かについて判定するように構成されている第2判定部とを具備することを特徴とする試験装置。
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US13/143,774 US8116211B2 (en) | 2009-01-08 | 2010-01-08 | Test method and test device |
CN2010800041942A CN102273286B (zh) | 2009-01-08 | 2010-01-08 | 试验方法以及试验装置 |
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