JP2011015433A - Test method and test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm whether a mobile station normally detects a synchronization state of downlink, even when starting a process of reconstruction of a connection state at a point of detecting failures of a radio link state in an RRC layer.SOLUTION: A test method includes: a first step of determining whether a mobile station detects the problem of a radio link state, when the radio quality is changed from a first state of a first threshold value or more to a second state of the first threshold value or less; and a second step of determining whether the mobile station does not detect the problem of the radio link state, when the radio quality is changed to a third state of a second threshold or more, after the lapse of a first time interval, from the change of the radio quality from the first state to the second state.

Description

  The present invention relates to a test method and a test apparatus.

  In general, a mobile communication system is configured to monitor a synchronization state between a radio base station and a mobile station. For example, in the WCDMA mobile communication system, the following two indices are defined in order to determine the downlink synchronization state in the physical layer (see, for example, Non-Patent Document 1).

・ Dedicated physical control channel (DPCCH) radio quality (DPCCH quality)
• Cyclic Redundancy Check (CRC) check Here, “DPCCH quality” is a pilot symbol or pilot power (TPC: transmission power control) IR reception quality (eg, S, n, eg, S). -to-interference power ratio) and reception level, and "CRC check result" corresponds to a block error rate.

  That is, the mobile station determines the downlink synchronization state based on, for example, the DPCCH radio quality.

  By the way, generally, in a mobile communication system, a test is applied to a mobile station and a radio base station in order to ensure the communication quality. For example, TS25.101 (Non-Patent Document 2) is created as a test specification for a mobile station in the WCDMA system.

  The operation of determining the downlink synchronization state in the mobile station described above is described in Section 6.4.4 of Non-Patent Document 2.

  Hereinafter, a test method for confirming the downlink synchronization state determination operation in the above-described WCDMA mobile station will be described with reference to FIG.

  In FIG. 1, “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.

  Here, 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). ) ".

  In addition, 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”.

  In the test method shown in FIG. 1, at time B, 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.

  That is, 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.

  Note that the time difference from time B to time C is set to take into account the determination delay in the mobile station.

  On the other hand, at time E, 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.

  That is, 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.

  Note that the time difference from time E to time F is set to take into account the determination delay in the mobile station.

3GPP TS25.214 V8.1.0 (May 2008), “4.3.1.3 Uplink Synchronization Primitives” 3GPP TS25.101 V8.2.0 (March 2008)

  As described above, in the test method for confirming the operation of determining the downlink synchronization state of the mobile station in the WCDMA system, 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.

  However, depending on the mobile communication system, the test method described above may not be applicable.

  For example, in LTE (Long Term Evolution), which is a successor system of WCDMA, 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.

  At this time, since the mobile station starts the process of reestablishing the connection state from the time of determining the failure of the radio link state in the RRC layer, there is a problem that the test method shown in FIG. 1 cannot be applied. To do.

  More specifically, when it is confirmed that uplink signal transmission is stopped at time C in FIG. 1, the mobile station has started connection state reconstruction processing. In E, even if the DPCCH radio quality is greater than Qin, transmission of the uplink signal is not started. Therefore, as a result, the test method shown in FIG. 1 cannot be applied.

  Therefore, 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. A first step of determining whether or not the mobile station detects a problem of the radio link state when the second state is less than or equal to a threshold; and the radio quality is changed from the first state to the second state. Whether 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 step is to include the second step.

  In the first feature of the present invention, in the first step and the second step, based on whether the mobile station is transmitting an uplink signal, the mobile station You may determine whether it detected.

  In the first feature of the present invention, in the first step and the second step, the mobile station 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.

  In the first aspect of the present invention, the uplink signal may be an uplink signal transmitted periodically.

  In the first aspect of the present invention, the uplink signal may be a sounding reference signal or a control signal notifying a downlink radio quality state.

  In the first aspect of the present invention, in the second step, 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

  In the first feature of the present invention, 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.

  In the first feature of the present invention, in the second step, when the mobile station does not detect the problem of the radio link state, 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. And a second determining unit configured to determine whether or not.

  As described above, according to the present invention, 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. Thus, it is possible to provide a test method and a test apparatus that make it possible to confirm whether or not the detection has occurred.

It is a figure which shows the determination method of the downlink synchronization state in a WCDMA system. It is a figure which shows the structure of the test system which concerns on this embodiment. It is a figure which shows the structure of the mobile station which concerns on this embodiment. It is a figure for demonstrating the mode of determination of the synchronous state of the downlink in the mobile station which concerns on this embodiment. It is a figure for demonstrating the mode of the radio link failure state detection in the mobile station which concerns on this embodiment. It is a figure for demonstrating the mode of the detection of In-sync in the mobile station which concerns on this embodiment. It is a figure which shows the structure of the test apparatus which concerns on this embodiment. It is a figure which shows the test method which concerns on this embodiment. It is a figure which shows the test method which concerns on this embodiment. It is a flowchart which shows the test method which concerns on this embodiment. It is a flowchart which shows the test method which concerns on this embodiment.

(Configuration of the test system according to the first embodiment of the present invention)
The configuration of the test system according to the first embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 2, the test system according to the present embodiment 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.

  In such a test system, “OFDM (Orthogonal Frequency Division Multiplexing)” is applied to the downlink as the radio access method, and “SC-FDMA (Single-Carrier Division Multiple Access)” is applied to the uplink. The

  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.

  Further, 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.

  Further, in the test system according to the present embodiment, 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 a physical downlink shared channel.

  Further, the test apparatus 200 is configured to transmit a downlink reference signal (DL RS) that is a downlink pilot signal.

  In the downlink, an interference signal is transmitted from the interference signal generation device 300 to the mobile station 100.

  In the test system according to the present embodiment, the radio quality of the PDCCH, PDSCH, and DL RS at the receiving end of the mobile station 100 is adjusted by adjusting the signal power of the PDCCH, PDSCH, and DL RS and the power of the interference signal. Adjusted.

  Here, the wireless quality is, for example, SIR (Signal-to-Interference Ratio).

  On the other hand, in the test system according to the present embodiment, 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.

  Further, 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.

  The mobile station 100 is configured to transmit a random access preamble via a physical random access channel (PRACH) in the uplink.

  Here, 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 acknowledgment information (ACK information for PDSCH). ) Etc. are included.

  Further, the mobile station 100 is configured to transmit a sounding reference signal (Sounding RS) in the uplink.

  In FIG. 2, 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 wired.

  In addition to the test apparatus 200, the mobile station 100, and the interference signal generation apparatus 300, an apparatus such as a fading simulator may be additionally connected. When such a fading simulator is connected, a test under a fading environment can be applied.

  As will be described later, when determining 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 test apparatus 200 The mobile station 100 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.

  In this case, when performing 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 relating to the mobile station 100 is held in the reconnection destination cell.

  As shown in FIG. 3, 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 radio quality in the mobile station 100 and determine the downlink synchronization state based on the radio quality.

  Here, 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. Note that the test apparatus 200 corresponds to the radio base station eNB in a mobile communication system to which the LTE scheme is applied.

  For example, 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.

  More specifically, when the SIR is greater than a predetermined threshold, 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.

  Alternatively, as shown in FIG. 4, 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. .

  Here, Qout <Qin, and the difference between Qin and Qout, that is, “Qin−Qout” corresponds to hysteresis. That is, in the example of FIG. 4, the synchronization state determination unit 102 determines that the SIR is greater than Qout when T <A, and thus determines that it is In-sync. At time T = A, the SIR is equal to or less than Qout. Based on this, it is determined that it is Out-of-sync.

  Then, the synchronization state determination unit 102 determines that the SIR is greater than Qin at the time T = B, and then determines that the SIR is In-sync. Then, at the time T = C, the SIR becomes equal to or less than Qout. Based on this, it is determined that it is Out-of-sync.

  As described above, by setting two threshold values, that is, by setting a hysteresis of “Qin−Qout”, it is possible to reduce the fluttering in the determination of In-sync and Out-of-sync. .

  Note that the synchronization state determination unit 102 may use a value obtained by averaging instantaneous SIR in a predetermined averaging section as the above-described SIR value. Here, 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. Alternatively, 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 radio link failure state determination unit 104 of the downlink synchronization state determination result (In-sync / Out-of-sync) described above.

  Note that 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. Here, the above 10 ms is merely an example, and may be a value other than 10 ms.

  In addition, 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.

  In the above-described example, 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.

  Alternatively, the synchronization state determination unit 102 uses a PDCCH error rate, a PCFICH error rate, a PCFICH SIR, a PDSCH error rate, a DL RS symbol error rate, etc., instead of the reference signal SIR. Also good.

  Here, PCFICH (Physical Control Format Indicator Channel) is a control signal for notifying the number of OFDM symbols for downlink control.

  Alternatively, the synchronization state determination unit 102 may determine the SIR of the reference signal (Reference Signal), the received power of the reference signal, the RSRQ, the CQI, the error rate of the PDCCH, the error rate of the PCFICH, as the downlink radio quality. PCFICH SIR, PDSCH error rate, or DL RS symbol error rate may be used.

  The RSRQ (Reference Signal Received Quality Power) is a value obtained by dividing the received power of the downlink reference signal by the downlink RSSI (Received Signal Strength Indicator).

  Here, 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. Yes (see Non-Patent Documents TS36.214, V8.3. 0 for the definition of RSRQ).

  Also, CQI (Channel Quality Indication) is downlink radio quality information (refer to non-patent documents TS36.213 and V8.3.0 for the definition of CQI).

  The radio link failure state determination unit 104 determines whether or not the 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.

  For example, 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.

  More specifically, as shown in FIG. 5, the radio link failure state determination unit 104 continuously receives N310 times down from the synchronization state determination unit 102 from time T = A to time T = B. A notification indicating Out-of-sync is received as the link synchronization state.

  In such a case, at time T = B, the radio link failure state determination unit 104 starts the timer T310. Then, when the timer T310 has expired (time T = C), the radio link failure state determination unit 104 determines that the wireless link failure state has occurred.

  The timer T310 corresponds to a timer for starting a process for reestablishing a connection state that is started when the mobile station detects a radio link state problem.

  Here, as shown in FIG. 6, the radio link failure state determination unit 104 is in a state where the timer T310 is activated from the synchronization state determination unit 102 between time T = C and time T = D. The notification of In-sync is received as the downlink synchronization state N311 times continuously.

  In such a case, the radio link failure state determination unit 104 stops the timer T310 at time T = D. In this case, since the timer T310 is stopped before it expires, the radio link failure state determination unit 104 does not determine that the state is a wireless link failure state.

  In the above-described example, N310 and N311 are thresholds related to the number of times Out-of-sync or In-sync is continuously notified. Instead, Out-of-sync or In-sync is continuous. It may be a threshold regarding the time notified.

  That is, N310 and N311 may be treated as timers similarly to 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.

  When the radio link failure state determination unit 104 determines that the wireless link failure state is present, 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.

  Note that the 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. In addition, 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.

  The reconnection process may be referred to as, for example, “Cell Update process”. “Cell Update process” means, for example, cell search, measurement of the radio quality of the searched cell, etc., and when there is a communicable cell, connection establishment is performed again for the cell. Point to.

  Here, when the mobile station 100 performs connection establishment again for the cell, first, 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.

  The “Cell Update process” may be referred to as a “Connection Re-establishment process”.

  The above-mentioned “when the determination result that the radio link failure state is notified from the radio link failure state determination unit 104” is “the result that the timer T310 has expired from the wireless link failure state determination unit 104”. It may mean “when notified”.

  That is, 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.

  Here, the uplink signal includes, for example, PUSCH, PUCCH, a sounding reference signal, and the like. Note that, for example, CQI, PMI, RI, and the like, which are downlink radio quality information, may be transmitted by the PUCCH.

  The uplink signal transmission unit 108 stops transmission of the uplink signal when notified from the radio link failure state determination unit 104 of the determination result that the radio link failure state is present.

  The above-mentioned “when the determination result that the radio link failure state is notified from the radio link failure state determination unit 104” is “the result that the timer T310 has expired from the wireless link failure state determination unit 104”. It may mean “when notified”.

  That is, 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.

  Note that, as described above, 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.

  In the above-described example, the case where the mobile station 100 transmits PUSCH or PUCCH in the uplink has been described. Instead, the operation when the mobile station 100 does not transmit PUSCH or PUCCH will be described below. For example, in LTE, when uplink timing alignment (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.

  In this case, 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.

  As shown in FIG. 7, 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.

  Further, 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.

  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.

  In this process, 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.

  Alternatively, 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.

  Alternatively, 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 reception unit 206 receives an uplink signal transmitted from the mobile station 100. Here, the uplink signal includes, for example, PUSCH, PUCCH, Sounding RS, and the like.

  Further, the uplink signal reception unit 206 receives a random access preamble transmitted from the mobile station 100.

  Further, 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.

  Then, 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.

  Alternatively, when receiving the random access preamble transmitted from the mobile station 100, the uplink signal receiving unit 206 notifies the mobile station operation determining unit 208 of information that the mobile station 100 has transmitted the random access preamble.

  Here, the uplink signal reception unit 206 may receive the random access preamble as a communicable cell in the reconnection process described above.

  That is, the uplink signal receiving 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.

  More specifically, 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 206. It is determined whether or not is normally determining the downlink synchronization state.

  Here, as shown in FIG. 8 and FIG. 9, 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.

  In this case, 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.

  Hereinafter, a test method for confirming whether or not the mobile station 100 has normally determined the downlink synchronization state in the test system according to the present embodiment will be described with reference to FIGS. 8 and 9.

  A test method for confirming whether or not the mobile station normally determines the downlink synchronization state when the downlink radio quality is changed from a good state to a poor state using FIG. explain.

  First, in the test, N310 is set to 0 and the timer T310 is set to “0 ms”. In the uplink, the mobile station 100 is set to transmit a periodic signal.

  Here, the periodic signal may be, for example, a PUCCH for transmitting Sounding RS or CQI / PMI / RI. Moreover, 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.

  At time B, the mobile station operation determination unit 208 changes the downlink radio quality from a state larger than Qout to a state smaller than Qout.

  At time C, 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.

  More specifically, 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.

  Here, in the determination process described above, at the moment when the value of N310 is “0” and the timer T310 is “0 ms”, 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.

  The time from time B to time C is a time that takes into account the processing delay in the mobile station 100.

  In the example described above, 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. In this case, the time C is set based on the values of N310 and T310.

  In the above-described example, the processing of the mobile station operation determination unit 208 in the case where the mobile station 100 transmits PUSCH or PUCCH in the uplink is shown. However, in the following, instead of transmitting PUSCH or PUCCH instead The process of the mobile station operation | movement determination part 208 in is shown.

  Here, 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.

  In this case, 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.

  More specifically, when the mobile station 100 determines that 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.

  A test method for confirming whether or not the mobile station normally determines the downlink synchronization state when the downlink radio quality is changed from a poor state to a good state using FIG. explain.

  First, in the test, N310 and N311 are set to “0”, and the timer T310 is set to a time interval from time B to time F. Alternatively, 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.

  In the uplink, the mobile station 100 is set to transmit a periodic signal. Here, the periodic signal may be, for example, a PUCCH for transmitting Sounding RS or CQI / PMI / RI. Moreover, 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.

  At time B, the mobile station operation determination unit 208 changes the downlink radio quality from a state larger than Qout to a state smaller than Qout.

  At time E, the mobile station operation determination unit 208 changes the downlink radio quality from a state smaller than Qin to a state larger than Qin.

  At time G, 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.

  More specifically, when the mobile station 100 is transmitting an uplink signal, 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.

  Here, in the determination process described above, 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 higher than Qin while the timer T310 is running. Is based.

  In other words, if the mobile station does not detect In-sync between time E and time G, timer T310 is not stopped, and therefore timer T310 is considered to expire by time G.

  In this case, since the mobile station 100 stops transmission of the uplink signal and starts the reconnection process, the uplink signal is not transmitted at the time G as a result.

  Note that the time from time E to time F is a time that takes into account the processing delay in the mobile station 100.

  In the example described above, the values of N310 and N311 are set to 0, and the value of timer T310 is the time interval from time B to time F. However, values other than those described above may be used. In this case, the time G is set based on the values of N310, N311, and T310.

  In the above-described example, the processing of the mobile station operation determination unit 208 in the case where the mobile station 100 transmits PUSCH or PUCCH in the uplink is shown. However, in the following, instead of transmitting PUSCH or PUCCH instead The process of the mobile station operation | movement determination part 208 in is shown.

  Here, 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.

  In this case, 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.

  More specifically, when the mobile station operation determining unit 208 determines that the mobile station 100 has not transmitted the random access preamble, the mobile station operation determining unit 208 determines that the mobile station 100 has detected In-Sync, 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.

  Note that 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.

  In the example described above, 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. .

  In this case, 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. The state of not corresponding to the state that the mobile station 100 has performed or is performing the reconnection process.

(Operation of the test system according to the first embodiment of the present invention)
The operation of the test system according to the first embodiment of the present invention will be described with reference to FIGS.

  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. .

  In 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.

  In step S1004, the test apparatus 200 determines whether or not the mobile station 100 is transmitting an uplink signal.

  Note that the 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. In this case, 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.

  When the mobile station 100 is transmitting an uplink signal (step S1004: YES), the process proceeds to step S1006.

  In step S1006, the test apparatus 200 determines that the mobile station 100 has not normally determined the downlink synchronization state.

  When the mobile station 100 is not transmitting an uplink signal (step S1004: NO), the process proceeds to step S1008.

  In 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. .

  In 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.

  In 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 in step S1102. .

  In step S1106, the test apparatus 200 determines whether the mobile station 100 is transmitting an uplink signal.

  Note that the 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. In this case, 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.

  When the mobile station 100 is not transmitting an uplink signal (step S1106: NO), the process proceeds to step S1108.

  In step S1108, the test apparatus 200 determines that the mobile station 100 has not normally determined the downlink synchronization state.

  When the mobile station 100 is transmitting an uplink signal (step S1106: NO), the process proceeds to step S1110.

  In step S1110, the test apparatus 200 determines that the mobile station 100 has normally determined the downlink synchronization state.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the first embodiment of the present invention, even when the mobile station starts the process of reestablishing the connection state when it detects a failure of the radio link state in the RRC layer, It is possible to check whether or not the station has detected the downlink synchronization status normally, and as a result, it is possible to guarantee the operation quality of the mobile station, resulting in stable communication quality in the mobile communication system. Furthermore, user convenience can be improved.

  Note that the operations of the test apparatus 200, the mobile station 100, and the interference signal generation apparatus 300 described above 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.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a 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. Such a storage medium and 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.

  Although the present invention has been described in detail using the above-described embodiment, it is obvious for those skilled in the art that the present invention is not limited to the embodiment described in the present specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 100 ... Mobile station 102 ... Synchronization state determination part 104 ... Radio link failure state determination part 106 ... Reconnection processing part 108 ... Uplink signal transmission part 200 ... Test apparatus 202 ... Downlink signal transmission part 204 ... Signal power adjustment part 206 ... Uplink signal reception unit 206 ... mobile station operation determination unit 300 ... interference signal generation device

Claims (9)

A test method for confirming a radio link state problem detection means in a mobile station,
A first determination is made as to whether or not the mobile station detects a problem of the radio link state when the radio quality is changed from a first state that is equal to or higher than a first threshold value to a second state that is equal to or lower than the first threshold value Process,
When the radio quality is changed to a third state that is equal to or higher than a second threshold after a first time interval has elapsed since the time when the radio quality was changed from the first state to the second state, the mobile station And a second step of determining whether or not to detect a radio link state problem. In the first step and the second step,
The test according to claim 1, wherein the mobile station determines whether or not the mobile station has detected a problem with the radio link state based on whether or not the mobile station is transmitting an uplink signal. Method. In the first step and the second step,
When the mobile station is transmitting an uplink signal, it is determined that the mobile station has not detected the radio link state problem;
The test method according to claim 2, wherein when the mobile station is not transmitting an uplink signal, it is determined that the mobile station has detected a problem of the radio link state.   The test method according to claim 3, wherein the uplink signal is an uplink signal transmitted periodically.   5. The test method according to claim 4, wherein the uplink signal is a sounding reference signal or a control signal notifying a downlink radio quality state. In the second step,
The first time interval is the same as a timer value for starting a process for reestablishing a connection state activated when the mobile station detects the radio link state problem. The test method according to claim 1. In the first step,
The test method according to claim 1, wherein when the mobile station detects a problem of the radio link state, the mobile station determines that the mobile station operates normally. In the second step,
The test method according to claim 1, wherein when the mobile station does not detect the radio link state problem, the mobile station determines that the mobile station is operating normally. A test apparatus for confirming a radio link state problem detection means in a mobile station,
When the radio quality is changed from the first state that is equal to or higher than the first threshold value to the second state that is equal to or lower than the first threshold value, the mobile station determines whether to detect the problem of the radio link status A first determination unit configured;
When the radio quality is changed to a third state that is equal to or higher than a second threshold after a first time interval has elapsed since the time when the radio quality was changed from the first state to the second state, the mobile station A test apparatus comprising: a second determination unit configured to determine whether or not to detect a radio link state problem.

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