WO2011125776A1 - 移動通信システムにおける移動機及び方法 - Google Patents
移動通信システムにおける移動機及び方法 Download PDFInfo
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- WO2011125776A1 WO2011125776A1 PCT/JP2011/058090 JP2011058090W WO2011125776A1 WO 2011125776 A1 WO2011125776 A1 WO 2011125776A1 JP 2011058090 W JP2011058090 W JP 2011058090W WO 2011125776 A1 WO2011125776 A1 WO 2011125776A1
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- 238000010295 mobile communication Methods 0.000 title description 6
- 238000004891 communication Methods 0.000 claims abstract description 69
- 238000005259 measurement Methods 0.000 claims description 22
- 238000013508 migration Methods 0.000 claims description 6
- 230000005012 migration Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 12
- 238000012986 modification Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
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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
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
- H04W36/362—Conditional handover
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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
Definitions
- the disclosed invention relates to a mobile device and a method in a mobile communication system.
- a mobile device communicates with a network device (including a base station and a radio network controller).
- the mobile device detects a plurality of cells that are communication targets or communication candidates, and measures the radio quality in those cells.
- the measurement value of the wireless quality of the communication candidate cell satisfies a preset condition, the cell to be communicated is switched. For example, if it is determined that a newly detected cell provides relatively better radio quality than a cell that is already communicating, the communication target cell is switched to the newly detected cell. .
- the high-speed downlink packet access (HSDPA) method realizes high-speed downlink communication in the wideband code division multiple access (W-CDMA) communication method.
- A-DPCH Associated Dedicated Physical CHannel
- HS-PDSCH High Speed-Physical Downlink Shared CHannel
- A-DPCH is communication using a dedicated channel, soft handover is performed, and only the cell to be switched is switched as necessary while communication with the serving cell is continued.
- HS-PDSCH is a communication using downlink sharing or a shared channel (Shared channel)
- a hard handover is performed when switching cells due to user movement, A momentary interruption occurs.
- Conventional handover is described in Patent Document 1, for example.
- the mobile device measures the quality (SIR, etc.) of CPICH, which is a pilot channel in the serving cell, and derives a channel quality indicator (CQI: Channel Quality Indicator) based on the measurement result.
- CQI Channel Quality Indicator
- the derived CQI is notified from the mobile device to the network device.
- the network apparatus can know the reception environment (wireless quality) of the mobile device, and can adaptively change the modulation scheme and transmission data amount of the downlink data according to the environment. Adaptively changing the data modulation scheme and the transmission data amount (or channel coding rate) is called adaptive modulation and channel coding.
- the relationship of the downlink data modulation scheme and transport block size (Transport Block size) to each CQI value is defined in the 3GPP specification (see Non-Patent Document 2 for this).
- HS-PDSCH switching from the serving cell is also frequently performed.
- downlink data is exchanged between the mobile device and the network device via the common channel HS-PDSCH.
- the exchange of downlink data is temporarily stopped and cell switching processing is performed. Therefore, when HS-PDSCH switching frequently occurs, the frequency at which downlink data is interrupted also increases, and as a result, the communication speed of downlink data may decrease.
- An object of the disclosed invention is to suppress cell switching that is not essential for continuing communication.
- a mobile device is provided.
- a measurement unit for measuring the radio quality of each of the serving cell and the migration destination candidate cell; It is determined whether the radio quality of the serving cell is worse than a reference quality previously associated with a predetermined throughput, and if the radio quality of the serving cell is worse than the reference quality, the radio quality of the serving cell,
- a cell switching determination unit that compares the radio quality of the transfer destination candidate cell and determines whether or not the serving cell should be switched to the transfer destination candidate cell;
- a radio communication unit that transmits a signal requesting switching of the serving cell and receives a signal instructing switching of the serving cell from a network device.
- cell switching that is not indispensable for continuing communication can be suppressed.
- standard CQI is 20.
- FIG. The flowchart which shows the operation example performed with the mobile apparatus of FIG.
- a mobile device obtains and stores a CQI for each cell that has been detected and measured by a mobile device, including a serving cell other than the serving cell and a cell other than the serving cell, and a CQI of the serving cell.
- a mobile device determines whether or not the serving cell needs to be switched by comparing absolute values with the reference CQI.
- the mobile station switches the serving cell, it makes a cell switching decision by absolute value comparison and relative value comparison for any index (Ec / N 0 , RSCP, path loss, SIR, CQI, etc.) of the cell to be compared.
- an index Ec / N 0 , RSCP, path loss, SIR, CQI, etc.
- the mobile device measures the data communication speed during communication at regular intervals, saves the measured value, and dynamically changes the reference CQI value when switching the serving cell based on the past data communication speed. Good. Thereby, the value of the reference CQI can be changed to a value suitable for the communication situation, and further optimization of cell switching can be further promoted.
- FIG. 1 shows a mobile device according to one embodiment.
- FIG. 1 shows a reception unit 101, a reception control unit 102, a transmission unit 103, a transmission control unit 104, a radio quality measurement unit 105, an SIR derivation unit 106, various table storage units 107, a CQI determination unit 108, and a cell switching determination unit 109.
- a data communication speed measurement unit 110 and a threshold determination unit 111 are illustrated.
- FIG. 1 schematically shows only elements that are particularly related to the present embodiment among various functional elements provided in the mobile device. Therefore, the way of dividing the functional elements shown in the figure is convenient, and for example, two or more functional elements may be realized by one means. These functional elements may be realized by software, hardware, or a combination thereof.
- the mobile device is a user device such as a mobile phone, an information terminal, a personal digital assistant, a portable personal computer, or the like.
- the receiving unit 101 receives a signal transmitted from the network device.
- the network device includes at least a base station, and optionally includes a radio network controller that controls the base station.
- the reception control unit 102 controls the reception operation in the reception unit 101.
- the transmission unit 103 transmits traffic data and control data from the mobile device to the network device.
- the transmission control unit 104 controls the transmission operation in the transmission unit 103.
- Radio quality measuring section 105 measures an index indicating the radio quality of each cell based on the pilot signal (CPICH) received from the serving cell and cells other than the serving cell during HSDPA communication.
- the wireless quality indicator may be expressed in any appropriate amount such as Ec / N 0 , RSCP, path loss, and the like.
- the SIR deriving unit 106 derives the SIR from the radio quality index calculated by the radio quality measuring unit 105.
- the SIR may be estimated from Ec / N 0 measured from the CPICH of each cell.
- the correspondence between Ec / N 0 and SIR as shown in FIG. 2 may be used.
- Such a correspondence relationship may be derived, for example, from a result of actual measurement in a commercial network.
- the correspondence relationship between the derived Ec / N 0 and the SIR may be stored as a table in the various table storage unit 107, for example, and read as necessary.
- the SIR deriving unit 106 converts Ec / N 0 obtained in each cell based on the table into SIR.
- the “radio quality index” is Ec / N 0 , RSCP, path loss, etc., and the SIR is derived from these.
- “radio quality” may be a measurement result of RSCP, Ec / N 0 , path loss, or the like after despreading processing. It may be SIR or CQI derived from SIR, and it is a quantity that represents the quality of the radio state.
- the various table storage unit 107 in FIG. 1 stores not only the table showing the correspondence between Ec / N 0 and SIR, but also other tables or information as shown in FIGS.
- the tables and information stored in the various table storage units 107 as shown in FIGS. 2 to 4 may be stored in advance in the mobile device, or may be stored as a result of measurement by the mobile device, It may be updated according to a notification from the network device periodically or at the time of registering the location in a specific area. How to use these tables or information will be described later.
- the 1 uses the SIR derived by the SIR deriving unit 106 to determine the CQI for each of the serving cell and cells other than the serving cell.
- the cell switching determination unit 109 performs two types of determination. One is to determine whether the radio quality (CQI, Ec / N 0, etc.) of the serving cell is worse than the reference quality (CQI, Ec / N 0, etc.) previously associated with a predetermined throughput. is there. This is an absolute determination that compares a value that is not determined in advance (radio quality of the serving cell) with a value that is determined in advance (reference quality). The other is to compare the radio quality of the serving cell with the radio quality of one or more destination candidate cells and determine whether to switch the serving cell to the destination candidate cell. This is a relative determination of comparing values that are not determined in advance.
- the data communication speed measurement unit 110 measures the data communication speed (throughput) of communication in the serving cell, and stores the measurement results in various table storage units 107.
- the threshold determination unit 111 dynamically sets the reference quality so that the reference quality (reference CQI, etc.) is an optimal value at the present time in consideration of the data communication speed obtained in the past.
- FIG. 5 is a flowchart showing an operation example performed by the mobile device of FIG.
- the mobile device performs communication in the HSDPA mobile communication system.
- the disclosed invention may be applied to mobile communication systems other than the HSDPA scheme.
- the mobile device receives a pilot signal (CPICH) from the serving cell and cells other than the serving cell.
- CPICH pilot signal
- Cells other than the serving cell are adjacent cells or neighboring cells that are adjacent to the serving cell.
- step S1 the mobile station detects the presence of a new cell other than the serving cell.
- the radio quality measurement unit 105 measures the radio quality of each cell based on the serving cell and the CPICH received from cells other than the serving cell.
- the radio quality may be expressed by Ec / N 0 , RSCP, or the like, but for convenience of explanation, it is assumed that the radio quality measurement unit 105 in this step measures Ec / N 0 .
- the SIR deriving unit 106 obtains an SIR for each cell.
- the SIR may be estimated using Ec / N 0 measured from the CPICH of each cell.
- a table as shown in FIG. 2 may be used. Such a table may be stored in various table storage units 107.
- the table as shown in FIG. 2 may be created based on, for example, Ec / N 0 and SIR actually measured in a commercial network.
- CQIs for the serving cell and cells other than the serving cell are derived by the CQI determining unit 108.
- step S4 the cell switching determination unit 109 determines whether or not the radio quality (CQI, Ec / N 0, etc.) of the serving cell is worse than a predetermined reference quality (CQI, Ec / N 0, etc.). It is determined whether or not it is necessary to determine whether switching is necessary. This is an absolute determination that compares a value that is not determined in advance (radio quality of the serving cell) with a value that is determined in advance (reference quality).
- the reference quality is a value associated in advance with the throughput desired for the mobile device.
- FIG. 3 shows an example of a correspondence relationship between the SIR measurement value, CQI that can be the reference quality, and the downlink data communication speed (throughput) expected in the case of the CQI.
- the reference quality is expressed by CQI, but may be expressed by another value such as Ec / N 0 .
- the correspondence between CQI and data communication speed may be set theoretically or may be set based on actual measurement.
- the relationship between MCS values corresponding to each CQI value is defined in the 3GPP specification. Based on such a relationship, a correspondence relationship as shown in FIG. 3 may be derived by calculating an assumed downlink data communication speed and stored in the various table storage units 107.
- the MCS value is a parameter that designates a predetermined combination of a data modulation scheme and a transport block size (or channel coding rate). In general, a larger MCS value corresponds to a high throughput and a smaller MCS value corresponds to a low throughput.
- each CQI value is actually obtained, by measuring how much average downlink data communication speed can be obtained, the correspondence as shown in FIG. It may be stored in the storage unit 107.
- the mobile station specifies the radio quality (in this example, CQI) necessary to realize the intended data communication speed, and uses it as the reference quality. can do.
- CQI the radio quality
- the radio quality derived from each cell such as CQI
- step S4 of FIG. 5 the cell switching determination unit 109 determines whether or not the radio quality of the serving cell is worse than the reference quality determined as described above. Details of the processing in step S4 are shown in FIG.
- reference quality (reference CQI in the present example) is determined in advance as a threshold for obtaining an expected downlink data communication speed. For example, assume that the reference CQI is 20. In this case, as shown in FIG. 4, information that “the serving cell is switched when CQI is less than 20 and the serving cell is not switched when CQI is 20 or more” is stored in various table storage units 107. Has been. When the CQI of the serving cell in communication exceeds the reference CQI, switching of the serving cell is not essential. This is because it is assumed that the expected data communication speed can be obtained even if communication is continued without switching. Therefore, in this case, it is determined not to switch the serving cell, and the processing flow proceeds to step S5 in FIG.
- step S5 the transmission control unit 104 of the mobile device stops the process of transmitting a signal (measurement report) for requesting switching of the serving cell, and then continues to measure the quality of the cell during communication or measurement.
- a signal measure report
- switching of the serving cell which is not essential for communication continuation can be appropriately prohibited, and useless switching can be suppressed. That is, it is possible to prevent a decrease in data communication speed due to unnecessary switching of the serving cell while ensuring a data communication speed of a certain level or more.
- step S6 the radio quality of the serving cell is compared with the radio quality of each cell other than the serving cell. Then, in step S7, it is determined whether or not the radio quality of cells other than the serving cell is better than a predetermined threshold value than the radio quality of the serving cell. More precisely, it is determined whether or not such a magnitude relationship continues for a predetermined period (for example, the duration for event 1d in FIG. 4).
- the radio quality may be CQI, RSCP, Ec / N 0 , path loss, or the like.
- step S7 a relative comparison of Ec / N 0 of the cell other than the serving cell and the serving cell, if the Ec / N 0 of the cells other than the serving cell, there was no better than the threshold value than Ec / N 0 of the serving cell during communication, the serving cell There is no switching.
- the processing flow returns from step S7 to step S5, the transmission of the signal requesting the change of the serving cell is not performed, and the quality measurement of the serving cell and other cells is continued.
- the serving cell and the other radio quality of the cell e.g., Ec / N 0
- the serving cell and the other radio quality of the cell e.g., Ec / N 0
- relative comparison if the Ec / N 0 of the cells other than the serving cell, was good over the threshold than the Ec / N 0 of the serving cell in the communication It is decided to switch the serving cell.
- the process flow proceeds from step S7 to step S8.
- the radio quality of each cell compared at the time of cell switching may be a measurement result such as RSCP, Ec / N 0 , path loss, etc., SIR after despreading processing, or CQI derived from SIR.
- step S8 under the control of the transmission control unit 104, the transmission unit 103 transmits a signal (measurement report) for requesting switching of the serving cell to the network device.
- step S9 the reception unit 101 receives a signal (handover command) instructing switching of the serving cell from the network device.
- step S10 the mobile device performs a hard handover by synchronizing with the migration destination cell or the target cell, and switches the serving cell to the migration destination cell.
- FIG. 7 is a flowchart showing a modification of the above embodiment. Generally the same as the float of FIG. 5, except that steps S32 and S33 are added. In step S31 in FIG. 7, processing similar to that in step S3 in FIG. 5 is performed.
- the data communication measurement unit 110 in FIG. 1 measures the data communication speed (throughput) in the serving cell during communication, and saves the measurement results in various table storage units 107.
- the threshold determination unit 111 determines an optimal reference quality (for example, reference CQI) at the present time based on the data communication speed obtained in the past, and notifies the cell switching determination unit 109 of the reference quality. .
- an optimal reference quality for example, reference CQI
- the radio quality (for example, Ec / N 0 , SIR, CQI, etc.) is obtained not only for the serving cell but also for each cell other than the serving cell. Then, by referring to the assumed throughput for each wireless quality stored in advance as a database, it is possible to know the expected throughput when communication is continued in the serving cell. When determining whether the serving cell needs to be switched, it is possible to determine not only the wireless quality but also the throughput (data communication speed). If a neighboring cell with good quality is found, if the expected throughput of the serving cell is equal to or higher than the threshold, it is determined that switching to the cell is unnecessary, and the serving cell is not switched.
- the throughput assumed for the serving cell is less than the threshold, it is determined that it is necessary to determine whether the serving cell needs to be switched, and thereafter, whether the serving cell needs to be switched is determined. In this way, it is possible to suppress unnecessary cell switching that may reduce the downlink data communication speed by determining whether or not the serving cell needs to be switched in two stages in consideration of not only wireless quality but also throughput. As a result, downlink throughput can be improved.
- the disclosed invention may be applied to any appropriate mobile communication system in which a mobile device having a function of switching serving cells is used.
- the disclosed invention may be applied to an HSDPA / HSUPA W-CDMA system, an LTE system, an LTE-Advanced system, an IMT-Advanced system, a WiMAX system, a Wi-Fi system, and the like.
- specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified.
- the classification of the examples or items is not essential, and the items described in two or more items may be used in combination as necessary, and the items described in one item are described in another item May be applied to the matter (unless it conflicts).
- the device according to the embodiment has been described using a functional block diagram, but at least a part of such a device may be realized by hardware, software, or a combination thereof.
- the software is available on random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database and any other suitable storage medium Also good.
- RAM random access memory
- ROM read only memory
- EPROM electrically erasable programmable read only memory
- EEPROM electrically erasable programmable read-only memory
- registers registers
- HDD hard disk
- removable disk CD-ROM
- database any other suitable storage medium Also good.
- the present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like
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Abstract
Description
サービングセル及び移行先候補セル各々の無線品質を測定する測定部と、
前記サービングセルの無線品質が、所定のスループットに予め対応付けられている基準品質より悪いか否かを判定し、前記サービングセルの無線品質が前記基準品質より悪かった場合、前記サービングセルの無線品質と、前記移行先候補セルの無線品質とを比較し、前記サービングセルを前記移行先候補セルに切り替えるべきか否かを判定するセル切替判定部と、
前記サービングセルの切り替えを要求する信号を送信し、前記サービングセルの切り替えを指示する信号をネットワーク装置から受信する無線通信部と
を有する移動機である。
2.動作例
3.変形例
図1は一実施例による移動機を示す。図1には、受信部101、受信制御部102、送信部103、送信制御部104、無線品質測定部105、SIR導出部106、各種テーブル格納部107、CQI判定部108、セル切替判定部109、データ通信速度測定部110及び閾値判定部111が、図示されている。図1は、移動機に備わる様々な機能要素の内、本実施例に特に関連する要素を模式的に示しているにすぎない。したがって、図示の各機能要素の分け方は便宜的なものであり、例えば2つ以上の機能要素が1つの手段により実現されてもよい。これらの機能要素は、ソフトウェア、ハードウェア又はそれらの組み合わせにより実現されてもよい。移動機は、携帯電話、情報端末、パーソナルディジタルアシスタント、携帯用パーソナルコンピュータ等のようなユーザ装置である。
図5は、図1の移動機で行われる動作例を示すフローチャートである。説明の便宜上、移動機はHSDPA方式の移動通信システムにおいて通信を行っているものとする。しかしながら、開示される発明は、HSDPA方式以外の移動通信システムに適用されてもよい。移動機は、サービングセル及びサービングセル以外のセルから、パイロット信号(CPICH)を受信するものとする。サービングセル以外のセルは、サービングセルに隣接している隣接セル又は周辺セルである。
図7は上記実施例の変形例を示すフローチャートである。概して図5のフロート同様であるが、ステップS32及びS33が追加されている点が主に異なる。図7のステップS31では図5のステップS3と同様な処理が行われる。
Claims (5)
- サービングセル及び移行先候補セル各々の無線品質を測定する測定部と、
前記サービングセルの無線品質が、所定のスループットに予め対応付けられている基準品質より悪いか否かを判定し、前記サービングセルの無線品質が前記基準品質より悪かった場合、前記サービングセルの無線品質と、前記移行先候補セルの無線品質とを比較し、前記サービングセルを前記移行先候補セルに切り替えるべきか否かを判定するセル切替判定部と、
前記サービングセルの切り替えを要求する信号を送信し、前記サービングセルの切り替えを指示する信号をネットワーク装置から受信する無線通信部と
を有する移動機。 - 1つ以上の無線品質と、該1つ以上の無線品質各々について予想されるスループットとの対応関係を保持する格納部をさらに有する、請求項1記載の移動機。
- 前記セル切替判定部は、前記サービングセルの無線品質が、所定のスループットに予め対応付けられている基準品質より悪いか否かを判定し、前記サービングセルの無線品質が前記基準品質以上良かった場合、前記サービングセルを前記移行先候補セルに切り替えないことを決定する、請求項1又は2に記載の移動機。
- 前記サービングセルにおけるスループットを測定するスループット測定部と、
測定されたスループットに応じて前記基準品質を設定する閾値判定部と
をさらに有する、請求項1ないし3の何れか1項に記載の移動機。 - サービングセル及び移行先候補セル各々の無線品質を測定するステップと、
前記サービングセルの無線品質が、所定のスループットに予め対応付けられている基準品質より悪いか否かを判定し、前記サービングセルの無線品質が前記基準品質より悪かった場合、前記サービングセルの無線品質と、前記移行先候補セルの無線品質とを比較し、前記サービングセルを前記移行先候補セルに切り替えるべきか否かを判定するステップと、
前記サービングセルの切り替えを要求する信号を送信し、前記サービングセルの切り替えを指示する信号をネットワーク装置から受信するステップと
を有する、移動機における方法。
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US13/639,046 US9144004B2 (en) | 2010-04-02 | 2011-03-30 | Mobile station and method for mobile communication system |
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US9144004B2 (en) | 2015-09-22 |
JP2011217314A (ja) | 2011-10-27 |
US20130023271A1 (en) | 2013-01-24 |
CN102893664A (zh) | 2013-01-23 |
JP5185969B2 (ja) | 2013-04-17 |
EP2555561A4 (en) | 2014-04-02 |
EP2555561A1 (en) | 2013-02-06 |
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