WO2010110302A1 - 移動局及び移動通信方法 - Google Patents
移動局及び移動通信方法 Download PDFInfo
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- WO2010110302A1 WO2010110302A1 PCT/JP2010/055060 JP2010055060W WO2010110302A1 WO 2010110302 A1 WO2010110302 A1 WO 2010110302A1 JP 2010055060 W JP2010055060 W JP 2010055060W WO 2010110302 A1 WO2010110302 A1 WO 2010110302A1
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- 238000010295 mobile communication Methods 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 21
- 238000005259 measurement Methods 0.000 claims abstract description 156
- 238000001914 filtration Methods 0.000 claims abstract description 90
- 238000012935 Averaging Methods 0.000 claims description 10
- 230000002123 temporal effect Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0604—Management of faults, events, alarms or notifications using filtering, e.g. reduction of information by using priority, element types, position or time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/06—Generation of reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a mobile station and a mobile communication method.
- a mobile station UE User Equipment: user equipment
- UE User Equipment
- a mobile station UE is configured to continue communication by switching cells when moving from one cell to another cell.
- Such cell switching is called “Mobility control”, more specifically, “handover”.
- a mobile station UE moves to a neighboring cell, and the received power of a signal from the neighboring cell is stronger than the received power of a signal from a serving cell (Serving Cell).
- the mobile station UE is configured to perform a handover to a neighboring cell.
- the mobile station UE needs to measure the received power of signals from the serving cell and the neighboring cells at the same time as transmitting and receiving data to and from the serving cell.
- the received power of signals from neighboring cells or serving cells is, for example, “downlink reference signal (Reference Signal) received power (RSRP: Reference Signal Received Power)” transmitted from the neighboring cells or serving cells.
- RSRP Reference Signal Received Power
- step S1 the mobile station UE measures received power of signals from the serving cell and neighboring cells.
- step S2 the mobile station UE determines whether or not the received power of signals from neighboring cells satisfies the following (Equation 1).
- step S2 If it is determined that (Equation 1) is satisfied, in step S2, the mobile station UE notifies the network of an event A3 for reporting the above measurement result.
- the upper layer is configured to perform the filtering process (L3 Filtering) shown in (Equation 2) on the measurement value of the physical layer.
- n is an index related to measurement timing
- F n is a measurement result after filtering
- F n ⁇ 1 is filtering at the previous measurement timing. It is a later measurement result
- M n is a measurement result in the measurement unit.
- step S3 when the network receives the notification of event A3, the network determines that the mobile station UE should perform handover to the cell related to the received event A3.
- DRX discontinuous reception
- Such intermittent reception control is applied when the radio base station eNB and the mobile station UE are connected and there is no data to be communicated, and the mobile station UE in the intermittent reception state is periodically, It is configured to intermittently receive a downlink control signal transmitted via a physical downlink control channel (PDCCH: Physical Downlink Control Channel).
- PDCCH Physical Downlink Control Channel
- the time for receiving the downlink control signal transmitted through the PDCCH is called “On-duration (ON section, reception section)”.
- the mobile station UE only needs to receive a downlink control signal transmitted via the physical downlink control channel PDCCH intermittently, not at all timings, so that it is possible to reduce battery power consumption. It becomes.
- the mobile station UE performs physical downlink only in a reception interval (5 ms in the example of FIG. 2) set every DRX cycle (1280 ms in the example of FIG. 2).
- a downlink control signal transmitted via the link control channel PDCCH is received, and the other transceivers are turned off.
- the mobile station UE can reduce the power consumption of the battery.
- the measurement frequency of the received power of the signals from the serving cell and the surrounding cells is reduced.
- intermittent reception control is applied when the radio base station eNB and the mobile station UE are connected. That is, as the state of each mobile station UE, there are two types of states, an intermittent reception state and a non-discontinuous reception state, depending on the presence or absence of data to be communicated.
- the mobile station UE in the intermittent reception state is generally configured to measure the serving cell and the neighboring cells only in the reception section in the intermittent reception control. .
- the measurement period of the received power of the signal from the serving cell and the neighboring cell in the intermittent reception state is generally a measurement of the received power of the signal from the serving cell and the neighboring cell in the non-discontinuous reception state. It is longer than the section (hereinafter, the measurement section in the non-discontinuous reception state).
- the mobile station UE measures the reception power of the signals from the serving cell and the neighboring cells only in the reception period, and thus there is a problem that the number of measurement samples becomes small. This is because in order to solve the problem, it is necessary to increase the number of measurement samples and improve the measurement accuracy.
- the measurement interval in the non-intermittent reception state is 200 ms, but the measurement interval in the intermittent reception state is a value obtained by multiplying the DRX cycle by five.
- 5 times the DRX cycle is synonymous with a value obtained by averaging five measurement results in the reception interval being a measurement result in the intermittent reception state.
- Equation 2 For example, consider a case where the optimum value of “k” in the non-discontinuous reception state is “4”. In this case, (Equation 2) described above is as follows.
- the approximate measurement interval after filtering can be regarded as 12800 ms.
- Such 12800 ms is calculated by 6400 ms (1280 ms ⁇ 5) ⁇ 0.5.
- the present invention has been made in view of the above problems, and a mobile station and a mobile communication method capable of appropriately performing measurement and handover of neighboring cells when intermittent reception control is applied.
- the purpose is to provide.
- a first feature of the present invention is a mobile station that communicates with a radio base station, the measurement unit configured to measure the radio quality of a serving cell and a neighboring cell in the mobile station, and the measurement result, A filtering unit configured to perform filtering using a predetermined coefficient, a determination unit configured to determine whether or not to notify the filtered measurement result, and the measurement result by the determination unit A notification unit configured to notify the radio base station of the measurement result when the mobile station is in an intermittent reception state.
- the gist is that the value of the predetermined coefficient is adjusted.
- the filtering unit equalizes the filtered measurement result in the non-discontinuous reception state and the filtered measurement result in the intermittent reception state in a temporal averaging interval.
- the predetermined coefficient may be adjusted.
- the filtering unit performs the filtering based on the predetermined coefficient notified from the radio base station in a non-intermittent reception state, and adjusts the filtering in the intermittent reception state.
- the filtering may be performed based on a later predetermined coefficient.
- the filtering unit performs the filtering in an intermittent reception state when a measurement period by the measurement unit in a non-intermittent reception state is smaller than a measurement period by the measurement unit in an intermittent reception state. You may be comprised so that it may not perform.
- the filtering unit sets an index related to measurement timing to “n”, sets the measurement result after filtering to “F n ”, sets the predetermined coefficient to “k”, and sets the predetermined coefficient to “k”.
- a second feature of the present invention is a mobile communication method, which includes a step A for measuring radio quality of a serving cell and neighboring cells in a mobile station, and a step B for filtering the measurement result using a predetermined coefficient.
- FIG. 1 is a flowchart showing a general handover operation.
- FIG. 2 is a diagram for explaining the operation of a mobile station in a general intermittent reception state.
- FIG. 3 is an overall configuration diagram of the mobile communication system according to the first embodiment of the present invention.
- FIG. 4 is a functional block diagram of the mobile station according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing the operation of the mobile station according to the first embodiment of the present invention.
- the mobile communication system is an LTE mobile communication system.
- an “OFDM (Orthogonal Frequency Division Multiplexing) scheme” is applied to the downlink
- an “SC-FDMA (Single-Carrier Division Multiple Access) scheme” is applied to the uplink. Is being considered.
- 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 radio base station eNB transmits a downlink control signal via the physical downlink control channel PDCCH and downlink data via the physical downlink shared data channel PDSCH (Physical Downlink Shared Channel). It is configured to transmit a signal.
- PDCCH Physical Downlink control channel
- PDSCH Physical Downlink Shared Channel
- the mobile station UE is configured to transmit an uplink data signal via a physical uplink shared data channel PUSCH (Physical Uplink Shared Channel).
- PUSCH Physical Uplink Shared Channel
- the mobile station UE includes a state management unit 11, a parameter acquisition unit 12, a measurement unit 13, a filtering unit 14, a determination unit 15, and a notification unit 16.
- the state management unit 11 is configured to manage whether or not the mobile station UE is in an intermittent reception state.
- the state management unit 11 notifies the filtering unit 14 and the determination unit 15 of information on whether the mobile station UE is in an intermittent reception state or a non-discontinuous reception state.
- the parameter acquisition unit 12 is configured to acquire parameters related to mobility control from the radio base station eNB.
- a filter coefficient to be described later is included in the parameter related to Mobility control.
- Parameters such as “Time-to-trigger” and hysteresis are also included in the parameters related to the mobility control.
- the parameter acquisition unit 12 is configured to notify the filtering unit 14 of the filter coefficients described above.
- the measuring unit 13 is configured to measure the radio quality in the serving cell and surrounding cells of the mobile station UE.
- the measurement unit 13 measures received power of a signal (for example, a reference signal (RS: Reference Signal) or the like) from the serving cell and the neighboring cell of the mobile station UE as the radio quality in the serving cell and the neighboring cell of the mobile station UE.
- a signal for example, a reference signal (RS: Reference Signal) or the like
- RSRP Reference Signal Received Power
- the measurement period (Measurement period) in the physical layer is 200 ms
- the measurement period (Measurement period) in the physical layer is 6400 ms (DRX cycle ⁇ 5).
- the DRX cycle is not limited to 1280 ms and may be a value other than 1280 ms.
- the measurement interval is set to “DRX cycle ⁇ 5” is shown below.
- the above-described measurement is performed only in the above-described DRX control reception period (On-duration). Therefore, by setting the measurement interval to “DRX cycle ⁇ 5”, the number of measurement samples is increased, and the measurement accuracy is improved.
- the measurement unit 13 is configured to notify the filtering unit 14 of the measurement results of the radio quality in the serving cell and the neighboring cells of the mobile station UE.
- the filtering unit 14 receives the measurement result of the radio quality in the serving cell and neighboring cells of the mobile station UE from the measurement unit 13, receives the filter coefficient (predetermined coefficient) from the parameter acquisition unit 12, and receives the measurement result and the filter coefficient Is used to calculate the filtering result.
- the filtering unit 14 sets the index related to the measurement timing to “n”, sets the measurement result after filtering to “F n ”, sets the filter coefficient to “k”, and sets the measurement result after filtering at the previous measurement timing.
- F n-1 is set and the measurement result in the measurement unit 13 is “M n ”
- filtering may be performed.
- the filter coefficient may be “a” instead of “k”.
- the measurement result “M n ” in the latest measurement unit 13 and the past filtering are adjusted by adjusting the filter coefficient “a” when calculating the measurement result “F n ” after filtering.
- the contribution rate of the subsequent measurement result “F n-1 ” is adjusted.
- the contribution ratio of the past filtered measurement result Is preferably reduced (or eliminated).
- the filtering unit 14 is for the intermittent reception state so that the measurement result filtered in the non-discontinuous reception state and the measurement result filtered in the intermittent reception state are equal in the temporal averaging interval. Can be adjusted.
- the filtering unit 14 performs filtering based on the filter coefficient notified from the radio base station eNB in the non-discontinuous reception state, and based on the filter coefficient after being adjusted as described above in the intermittent reception state. , It may be configured to perform filtering.
- the filtering unit 14 adjusts the predetermined filter coefficient, which will be described later, “in the case of intermittent reception, the filtering process is performed at the same frequency as that of non-intermittent reception or at the same frequency.
- the predetermined filter coefficient may be adjusted so as to obtain a result equivalent to the case where the process of “the value of Mn used in the filtering process is updated for each measurement section” is performed.
- the filtering unit 14 may be configured not to perform filtering in the intermittent reception state when the measurement interval in the non-intermittent reception state is smaller than the measurement interval in the intermittent reception state.
- the filtering unit 14 multiplies the filter coefficient by a predetermined adjustment coefficient for each DRX cycle to obtain a filter coefficient for the intermittent reception state, and the filter for the intermittent reception state Using the coefficients, the index regarding the measurement timing is set to “n”, the measurement result after filtering is set to “F n ”, the filter coefficient for the intermittent reception state is set to “k”, and the filtering result at the previous measurement timing is filtered
- the filtering unit 14 includes a measurement interval in the intermittent reception state (a physical layer averaging interval in the measurement unit 13 in the intermittent reception state) and a measurement interval in the non-intermittent reception state (the measurement unit 13 in the non-intermittent reception state). If the measurement interval in the discontinuous reception state is smaller than the measurement interval in the non-discontinuous reception state, filtering is performed using the same filter coefficient as the filter coefficient for the non-discontinuous reception state. In the intermittent reception state, the filtering may not be performed when the measurement interval in the intermittent reception state is larger than the measurement interval in the non-intermittent reception state.
- the filtering unit 14 performs filtering processing in the intermittent reception state so that the measurement result filtered in the non-intermittent reception state and the measurement result filtered in the intermittent reception state are equal in the temporal averaging interval. May be performed at the same or the same frequency as the non-discontinuous reception and the filtering process in the state.
- the filtering process is performed every 200 ms, and “M n in the filtering process is performed. "Is updated every DRX cycle, that is, every 1280 ms.
- the measurement result in the reception section of the immediately previous DRX control is used as the value of “M n ”.
- the measurement result filtered in the non-discontinuous reception state and the measurement result filtered in the discontinuous reception state are equivalent in terms of temporal averaging intervals.
- the determination unit 15 is configured to determine whether or not to notify the measurement result (Measurement Report) after filtering received by the filtering 14 described above.
- the determination unit 15 may be configured to determine that the above measurement result should be notified when a predetermined condition is satisfied continuously for a predetermined period or longer.
- the determination unit 15 may use the predetermined condition as the condition of (Expression 1) described above.
- Such a predetermined period may be referred to as a Time-to-trigger.
- the notification unit 16 is configured to notify the radio base station eNB of the measurement result when the determination unit 15 determines that the measurement result should be transmitted.
- the notification unit 16 is configured to notify the radio base station eNB of the measurement result via the physical uplink shared channel PUSCH.
- a measurement result may be referred to as Measurement Report.
- step S101 the mobile station UE determines whether or not it is in an intermittent reception state.
- step S102 the mobile station UE measures the radio quality of the serving cell and the neighboring cells.
- step S103 the mobile station UE performs filtering using a value obtained by adjusting the filter coefficient notified from the radio base station to the measured radio quality of the serving cell and the neighboring cells.
- step S104 the mobile station UE measures the radio quality of the serving cell and the neighboring cells.
- step S105 the mobile station UE performs filtering using the filter coefficient notified from the radio base station to the measured radio quality of the serving cell and the neighboring cells.
- an intermittent reception state there are two types of states, an intermittent reception state and a non-discontinuous reception state. Instead, three types of a long intermittent reception state, a short intermittent reception state, and a non-discontinuous reception state are provided.
- the mobile station and the mobile communication method according to the present invention can be applied even when the above state exists.
- the above-described filter coefficient may be adjusted based on the measurement section in each physical layer.
- the reception power (RSRP) of the reference signal is used as the radio quality in the serving cell and the neighboring cells, but instead RSRQ, RS-SIR, and CQI are used. Also good. Alternatively, at least one of RSRP, RSRQ, RS-SIR, and CQI may be used as radio quality in the serving cell and neighboring cells.
- RSRQ Reference Signal Received Quality Power
- RSSI Received Signal Strength Indicator
- the RSSI is a total reception level observed in the mobile station, and is a reception level including all of thermal noise, interference power from other cells, power of a desired signal from the own cell, and the like. . (Refer to 3GPP TS36.214, V8.3.0 for RSRQ definition).
- RS-SIR is SIR (Signal-to-Interference Ratio) of a downlink reference signal.
- CQI Channel Quality Indicator
- 3GPP TS36.213, V8.3.0 for the definition of CQI.
- radio base station eNB and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .
- 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 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 radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.
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Abstract
Description
かかる(式1)が満たされていると判定された場合、ステップS2において、移動局UEは、上述の測定結果を報告するためのイベントA3を、ネットワークに対して通知する。
a = 1/2(k/4) … (式3)
なお、(式3)における「k」の値は、無線基地局から移動局UEに対して事前に通知されているものとする。
これは、フィルタリング前の測定結果である「Mn」の寄与が半分であることに基づくと、おおよそのフィルタリング後の測定区間は、400msとみなすことができる。かかる400msは、200ms÷0.5により算出される。
本発明の第1の特徴において、前記フィルタリング部は、非間欠受信状態における前記測定部による測定期間が、間欠受信状態における前記測定部による測定期間よりも小さい場合に、間欠受信状態において前記フィルタリングを行わないように構成されていてもよい。
Fn = (1-a)・Fn-1 + a・Mn
a = 1/2(k/4)
に基づいて、前記フィルタリングを行うように構成されていてもよい。
本発明の第2の特徴は、移動通信方法であって、移動局におけるサービングセル及び周辺セルの無線品質を測定する工程Aと、前記測定結果を、所定の係数を用いてフィルタリングする工程Bと、前記フィルタリングされた測定結果を通知すべきか否かについて判定する工程Cと、記測定結果を送信すべきであると判定された場合、該測定結果を無線基地局に対して通知する工程Dとを有し、前記工程Cにおいて、前記移動局が間欠受信状態である場合に、前記所定の係数の値を調整することを要旨とする。
図3乃至図4を参照して、本発明の第1の実施形態に係る移動通信システムの構成について説明する。
Fn = (1-a)・Fn-1 + a・Mn
a = 1/2(k/4)
に基づいて、フィルタリングを行うように構成されていてもよい。ここで、フィルタ係数は、「k」ではなく、「a」であってもよい。
Fn = (1-a)・Fn-1 + a・Mn
a = 1/2(k/4)
に基づいて、フィルタリングを行うこととしてもよい。
図5を参照して、本発明の第1の実施形態に係る移動通信システムの動作について、具体的には、本発明の第1の実施形態に係る移動局UEが上述のフィルタリングを行う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の作用・効果)
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UEは、間欠受信状態である場合にも、間欠受信状態のために最適化されたフィルタ係数に相当する平均化区間でフィルタリングを行うことが可能となるため、移動局UEが、適切なタイミングでネットワークに対して測定結果を報告し、通信断を起こすことなく通信を継続することができ、ネットワークにおける負荷や移動局UEの消費電流の抑制、更にはユーザ利便性を向上することができる。
なお、上述の無線基地局eNBや移動局UEの動作は、ハードウェアによって実施されてもよいし、プロセッサによって実行されるソフトウェアモジュールによって実施されてもよいし、両者の組み合わせによって実施されてもよい。
Claims (7)
- 無線基地局と通信する移動局であって、
前記移動局におけるサービングセル及び周辺セルの無線品質の測定結果を、フィルタ係数を用いてフィルタリングするように構成されているフィルタリング部と、
前記フィルタリングされた測定結果を通知すべきであると判定された場合、該測定結果を前記無線基地局に対して通知するように構成されている通知部とを具備し、
前記フィルタリング部は、測定タイミングに関するインデックスを「n」とし、フィルタリング後の測定結果を「Fn」とし、測定区間200ms用の前記フィルタ係数を「k」又は「a」とし、1つ前の測定タイミングにおけるフィルタリング後の測定結果を「Fn-1」とし、前記測定部における測定結果を「Mn」とした場合に、該フィルタ係数「k」又は「a」を調整した後に、
Fn = (1-a)・Fn-1 + a・Mn
a = 1/2(k/4)
に基づいて、前記フィルタリングを行うように構成されていることを特徴とする移動局。 - 間欠受信状態における測定区間は、200msよりも長いことを特徴とする請求項1に記載の移動局。
- 前記フィルタリング部は、前記移動局が間欠受信状態である場合に、前記フィルタ係数「k」を調整するように構成されていることを特徴とする請求項2に記載の移動局。
- 前記フィルタリング部は、非間欠受信状態における前記フィルタリングされた測定結果と、間欠受信状態における前記フィルタリングされた測定結果とが、時間的な平均化区間で同等になるように、前記フィルタ係数を調整することを特徴とする請求項1に記載の移動局。
- 前記フィルタリング部は、非間欠受信状態において、前記無線基地局から通知された前記フィルタ係数に基づいて、前記フィルタリングを行い、間欠受信状態において、前記調整された後のフィルタ係数に基づいて、前記フィルタリングを行うように構成されていることを特徴とする請求項1に記載の移動局。
- 前記フィルタリング部は、非間欠受信状態における前記測定部による測定期間が、間欠受信状態における前記測定部による測定期間よりも小さい場合に、間欠受信状態において前記フィルタリングを行わないように構成されていることを特徴とする請求項1に記載の移動局。
- 移動局におけるサービングセル及び周辺セルの無線品質の測定結果を、フィルタ係数を用いてフィルタリングする工程Aと、
前記フィルタリングされた測定結果を通知すべきであると判定された場合、該測定結果を無線基地局に対して通知する工程Bとを有し、
前記工程Aにおいて、測定タイミングに関するインデックスを「n」とし、フィルタリング後の測定結果を「Fn」とし、測定区間200ms用の前記フィルタ係数を「k」又は「a」とし、1つ前の測定タイミングにおけるフィルタリング後の測定結果を「Fn-1」とし、前記測定部における測定結果を「Mn」とした場合に、該フィルタ係数「k」又は「a」を調整した後に、
Fn = (1-a)・Fn-1 + a・Mn
a = 1/2(k/4)
に基づいて、前記フィルタリングを行うことを特徴とする移動通信方法。
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