WO2010001452A1 - 移動端末、基地局装置および移動通信システム - Google Patents
移動端末、基地局装置および移動通信システム Download PDFInfo
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- WO2010001452A1 WO2010001452A1 PCT/JP2008/061850 JP2008061850W WO2010001452A1 WO 2010001452 A1 WO2010001452 A1 WO 2010001452A1 JP 2008061850 W JP2008061850 W JP 2008061850W WO 2010001452 A1 WO2010001452 A1 WO 2010001452A1
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- cell search
- mobile terminal
- base station
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- frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Definitions
- the present invention relates to a mobile terminal, a base station apparatus, and a mobile communication system.
- Each base station has a cell which is a communicable range.
- a mobile terminal moves from its own cell, which is a cell of a base station with which a mobile terminal is currently communicating, to another cell, which is a cell of another base station, a handover is performed from the base station currently communicating with another base station It will be. Therefore, the mobile terminal periodically searches for other cells around the own cell (cell search).
- the mobile terminal communicates with a base station corresponding to a cell having a good reception level based on the cell search result.
- Patent Document 1 A technique for changing a cell search cycle depending on whether a mobile terminal stays in its own cell is known.
- a technique is known in which a mobile terminal stores in advance information such as a spread signal and a phase corresponding to a base station, thereby shortening a cell search period (Patent Document 2).
- a technique is known in which the base station notifies the mobile terminal of the past learning that the handoff has failed and performs a cell search based on the learning result (Patent Document 3). JP 2003-348001 A JP 2001-285909 A JP 2000-287256 A
- the cell search is performed by stopping communication between the base station and the mobile terminal.
- the mobile terminal, the base station apparatus, and the mobile communication system described in the present specification have been made in view of the above problems, and an object thereof is to optimize the cell search period.
- a mobile terminal that communicates with a base station apparatus, and includes a cell search unit that performs a cell search and performs a next cell search using a cell search period adjusted based on a period required for the cell search.
- a mobile terminal is used.
- a base station apparatus that communicates with a mobile terminal, wherein the mobile terminal acquires information on a period required for cell search from the mobile terminal based on the period required for the cell search
- a base station apparatus comprising: a notification unit that notifies the mobile communication of information regarding the adjusted cell search period.
- a mobile communication system including a base station apparatus and a mobile terminal that perform radio communication with each other, based on a cell search unit provided in the mobile terminal that performs cell search, and a period required for the cell search
- a calculation unit that calculates a period for performing cell search, and the cell search unit uses a mobile communication system that performs cell search in the cell search period calculated by the calculation unit.
- FIG. 1 is a diagram illustrating a cell arrangement of a mobile communication system according to a comparative example.
- FIG. 2 is a diagram illustrating the electric field strength of the mobile communication system according to the comparative example.
- FIG. 3 is a diagram illustrating an operation of the mobile communication system according to the comparative example.
- FIG. 4 is a diagram showing a cell arrangement.
- FIG. 5 is a diagram showing the electric field strength.
- FIG. 6A is a block diagram of the base station apparatus of the mobile communication system according to the first embodiment
- FIG. 6B is a block diagram of the mobile terminal.
- FIG. 7 is a functional block diagram of the mobile communication system according to the first embodiment.
- FIG. 8 is a diagram illustrating the operation of the mobile communication system according to the first embodiment.
- FIG. 9 is a flowchart showing the operation of the control unit of the base station apparatus.
- FIG. 10 is a flowchart showing the operation of the mobile terminal.
- FIG. 11 is a diagram illustrating a flow of the mobile communication system according to the first embodiment.
- FIG. 12 is a sequence diagram of the mobile communication system according to the second embodiment.
- FIG. 13 is a sequence diagram of the mobile communication system according to the third embodiment.
- FIG. 1 is a diagram showing a cell arrangement of a mobile communication system according to a comparative example.
- a mobile terminal MS is located between cells C1, C2 and C3 corresponding to base stations BS1, BS2 and BS3, respectively.
- Base stations BS1, BS2 and BS3 transmit radio signals using frequencies f1, f2 and f2 ', respectively.
- FIG. 2 shows the electric field strength for each frequency in the situation shown in FIG.
- the base stations BS1, BS2 and BS3 transmit signals used for radio quality measurement with similar transmission power, and the distance between the mobile terminal MS and each base station BS1, BS2 and BS3 is almost the same, The electric field strengths at f1, f2, and f2 ′ are almost the same.
- the mobile terminal MS stops communication with the currently communicating base station BS1 and changes the reception frequencies from f1 to f2, f2 ′.
- the cell search is performed by switching to.
- FIG. 3 is a diagram showing the operation of the mobile terminal MS.
- the right direction shows the transition of time.
- time is represented by the number of frames.
- the cell search period is represented by the number of cell search frames.
- the base station BS1 communicating with the mobile terminal MS negotiates with the mobile terminal MS and instructs the mobile terminal MS about the start timing and time (period) of the cell search.
- the cell search time (period) corresponds to 15 frames
- the normal communication time (period) between the base station BS1 and the mobile terminal MS corresponds to 35 frames.
- Cell search is performed periodically.
- the mobile terminal MS receives signals transmitted from the base stations BS2 and BS3 that form neighboring cells of the cell formed by the base station BS1 that is currently communicating, and is in the best reception state ( For example, a cell having a high electric field strength is searched.
- the mobile terminal MS communicates with the base station BS1.
- the mobile terminal MS also reports the communication quality of each base station BS2 to the base station BS1.
- FIG. 2 when the electric field strengths from the base stations BS1 and BS2 are approximately the same, the number of frames required for the cell search is approximately the same regardless of the base station BS2 or BS3 to be searched. Therefore, as shown in FIG. 3, the number of frames in which the mobile terminal MS performs cell search is constant and sufficient.
- FIG. 4 is a diagram showing a cell arrangement. The case where the overlapping part of the cell of base station BS1, BS2, and BS3 is large is shown.
- the base stations BS1, BS2, and BS3 are close to each other, such a situation is likely to occur particularly when the radio area C2 (C3) of the base station BS2 (or BS3) is larger than the radio area C1 of the base station BS1.
- the operators of the base stations BS1 and BS2 (BS3) may be different, and there may be a difference in the set value of transmission power.
- FIG. 5 shows the electric field strength for each frequency in the case of the cell arrangement of FIG.
- the number of frames required for cell search is related to the electric field strength from the base station. For example, when the electric field strength from the base station is weak, the time for synchronization and the time for averaging are increased in order to improve measurement accuracy. Therefore, in the case of the cell arrangement of FIGS. 4 and 5, the number of frames required for the cell search may be smaller than that in the case of the cell arrangement of FIGS. However, as shown in FIG. 3, when the number of frames for cell search is fixed, the number of frames for cell search is adjusted to the base station with low electric field strength. It will remain. That is, an extra search time is allocated.
- FIG. 6A is a block diagram of the base station apparatus of the mobile communication system according to the first embodiment
- FIG. 6B is a block diagram of the mobile terminal.
- the base station apparatus 10 includes an antenna 39, an RF (Radio frequency) unit 31, a PHY (Physical) unit 32, a MAC (Media access control) unit 33, a data buffer 34, a control unit 35, and DL / A UL (Down Link / Up Link) scheduler 36 is included.
- Data to be transmitted to the mobile terminal is stored in the data buffer 34.
- the DL / UL scheduler 36 instructs the data buffer 34 to transmit / receive data.
- the data is output to the RF unit 31 via the MAC unit 33 that controls the MAC layer and the PHY unit 32 that controls the physical layer.
- the RF unit 31 up-converts the baseband signal to a high frequency to obtain an RF signal.
- An RF signal is transmitted through the antenna 39.
- the control unit 35 controls the MAC unit 33 and the DL / UL scheduler 36 based on information (search time control information) on the number of cell search frames acquired from the mobile terminal, and determines the number of cell search frames (search period information). Instruct the mobile terminal.
- the mobile terminal 20 includes an antenna 49, an RF unit 41, a PHY unit 42, a MAC unit 43, a data buffer 44, and a control unit 45.
- Data to be transmitted to the base station apparatus 10 is stored in the data buffer 44.
- the operations of the MAC unit 43, the PHY unit 42, and the RF unit 41 are the same as those of the MAC unit 33, the PHY unit 32, and the RF unit 31, and a description thereof is omitted.
- the control unit 45 controls the MAC unit 43 and the PHY unit 42 to perform cell search. Also, the period required for the cell search is measured.
- FIG. 7 is a functional block diagram of the mobile communication system according to the first embodiment.
- the base station device 10 includes a calculation unit 12, a notification unit 14, and an acquisition unit 16.
- the control unit 35 in FIG. 6A functions as the calculation unit 12.
- the calculation unit 12 calculates (adjusts) the number of frames (search period) for the next cell search based on the number of frames actually required to perform the cell search received from the mobile terminal 20 (search period control information).
- search period control information is information indicating the time when the mobile terminal 20 switches the frequency to actually perform the neighboring cell search, and synchronizes the received signal to measure the reception quality. You can also.
- the RF unit 31, the PHY unit 32, and the MAC unit 33 when transmitting data to the mobile terminal 20 function as the notification unit 14.
- the RF unit 31, the PHY unit 32, and the MAC unit 33 when receiving data from the mobile terminal 20 function as the acquisition unit 16.
- the mobile terminal 20 includes a cell search unit 22, a notification unit 24, and an acquisition unit 26.
- the control unit 45 in FIG. 6B functions as the cell search unit 22.
- the cell search unit 22 periodically receives a signal transmitted from the base station apparatus 10 and performs a cell search.
- the RF unit 41, the PHY unit 42, and the MAC unit 43 when transmitting data to the base station device 10 function as the notification unit 24.
- the RF unit 41, the PHY unit 42, and the MAC unit 43 when receiving data from the base station apparatus 10 function as the acquisition unit 26.
- Data transmission from the notification unit 14 of the base station apparatus 10 to the acquisition unit 26 of the mobile terminal 20 is performed using radio such as a mobile phone. The same applies to data transmission from the notification unit 24 of the mobile terminal 20 to the acquisition unit 21 of the base station apparatus 10.
- FIG. 8 is a diagram illustrating the operation of the mobile communication system according to the first embodiment.
- the downlink DL indicates data transmission from the base station apparatus 10 to the mobile terminal 20, and the uplink UP indicates data transmission from the mobile terminal 20 to the base station apparatus 10.
- FIG. 9 is a flowchart showing the operation of the control unit 35 of the base station apparatus 10
- FIG. 10 is a flowchart showing the operation of the mobile terminal. 8 to 10, the base station device 10 and the mobile terminal 20 perform initial negotiation (step S10).
- the control unit 35 of the base station apparatus 10 communicates with the control unit 45 of the mobile terminal 20, determines the designated number N of frames for cell search (search period), and notifies the control unit 45 of the mobile terminal 20 To do.
- the base station apparatus 10 and the mobile terminal 20 transmit / receive data to / from each other (step S12).
- the control unit 35 of the base station device 10 stops data transmission to the mobile terminal 20, and the mobile terminal 20 also stops receiving from the base station device 10 (step S14).
- the control unit 45 of the mobile terminal 20 performs a cell search (step S16).
- the control unit 45 measures the number of frames J required for the cell search (search period information indicating the period actually required for the search) and the number of remaining frames K (step S18). Of the designated number N of frames, the remaining number of frames J required for the cell search is the number K of remaining frames.
- the base station apparatus 10 and the mobile terminal 20 perform wireless communication again (step S20).
- the notification unit 14 of the mobile terminal 20 notifies the base station device 10 of the received field strength of the base station and search period information (number of frames J and K) (step S22).
- the acquisition unit 26 of the base station apparatus 10 acquires the received electric field strength and search period information (the number of frames J and K) from the mobile terminal 20 (step S24).
- the calculation unit 12 of the base station apparatus 10 calculates (adjusts) the number of frames (search period) for the next cell search from the search period information (frame numbers J and K) (step S26).
- the number of frames J is the number of frames for the next cell search.
- the notification unit 24 of the base station apparatus 10 notifies the mobile terminal 20 of the number of frames J (search period) for the next cell search (step S28).
- the acquisition unit 16 of the mobile terminal 20 acquires the number J of frames for the next cell search from the base station apparatus 10 (step S30).
- the control unit 35 of the base station device 10 stops data transmission to the mobile terminal 20, and the mobile terminal 20 also stops receiving from the base station device 10 (step S32).
- the cell search unit 22 of the mobile terminal 20 performs a cell search in the search period (number of frames J) received from the base station apparatus 10 (step S34).
- the control unit 35 of the base station device 10 determines whether or not it is finished (step S38). If yes, the process ends. If no, the process returns to step S24.
- the control unit 45 of the mobile terminal 20 determines whether or not to end (step S40). If yes, the process ends. If no, the process returns to step S18. If not completed, the communication is continued as in step S36 in FIG. 8 to 10, the base station apparatus 10 is described as one, but the mobile terminal 20 may perform the same communication as a plurality of base station apparatuses 10 that perform cell search.
- the control unit 35 acquires the received electric field strength of radio waves from each base station device, and hands over to the base station device with the best reception state. Note that the mobile terminal 20 may report the search period information measured for each search period to the base station apparatus 10 and reflect it in the next search period every time. Of course, this report can be made only once.
- FIG. 11 is a diagram illustrating the operation of the mobile communication system according to the first embodiment. Compared to FIG. 3, the number of frames for the second and subsequent cell searches is 10 frames, and the number of frames for normal communication between the base station BS1 and the mobile terminal MS is 40 frames. Others are the same as those in FIG.
- the calculation unit 12 sets the number of frames J required for the cell search as the number J of frames for the next cell search.
- the cell search unit 22 performs the next cell search with the number of frames J for which the next cell search is performed.
- the received electric field strength at the next cell search is often almost the same as the received electric field strength at the previous cell search. Therefore, the number of frames for the next cell search is considered to be almost the same as the number of frames required for the previous cell search. Therefore, as in the first embodiment, by setting the number of frames for the next cell search to the number of frames required for the cell search, the next number of frames K in FIG. 8 can be reduced in the next cell search. For example, in the comparison between FIG. 3 and FIG. 11, the communication throughput can be improved by 14%.
- the cell search when the number of frames required for the cell search exceeds the number of frames J and becomes the number of frames J ′, the cell search overlaps with a normal communication frame. In this case, the calculation unit 12 sets the number of frames for the next cell search for the next time as the number of frames J ′. As described above, the cell search can be stably performed according to the arrangement of the base station apparatus 10 and the position of the mobile terminal 20.
- Example 2 is an example in which the number of frames in which the calculation unit 12 performs a cell search is set longer than the number of frames required for the cell search.
- FIG. 12 is a sequence diagram of the mobile communication system according to the second embodiment.
- the arithmetic unit 12 of the base station apparatus 10 sets the number of frames for cell search to the number of frames obtained by adding the number of frames J required for the cell search to the number of margin frames ⁇ .
- the notification unit 14 of the base station apparatus 10 notifies J + ⁇ as the number of frames for performing cell search to the acquisition unit 26 of the mobile terminal 20 (steps S28a and 30a).
- the cell search unit 22 performs a cell search with the number of frames J + ⁇ in which the cell search is performed.
- Other operations are the same as those in the first embodiment, and a description thereof will be omitted.
- the received field strength when performing the next cell search may be weaker than the received field strength when performing the previous cell search.
- the number of frames required for the next cell search is larger than the number of frames required for the previous cell search.
- the margin ⁇ can be a fixed number of frames or a variable number of frames.
- Example 3 is an example in which the calculation unit calculates a period for performing the next cell search based on the number of frames required for the cell search of a plurality of mobile terminals.
- FIG. 13 is a sequence diagram of the mobile communication system according to the third embodiment.
- the base station apparatus 10 communicates with a plurality of mobile terminals 20a to 20d.
- the acquisition unit 16 of the base station apparatus 10 acquires the received electric field strength, the number of frames J1 to J4 required for the cell search, and the number of remaining frames K1 to K4 from the notification units of the plurality of mobile terminals 20a to 20d (step S22a). To S22d and S24a to S24d).
- the calculation unit 12 calculates the number of frames L to be subjected to the next cell search based on the number of frames J1 to J4 required for the cell search of the plurality of mobile terminals 20a to 20d.
- the number of frames L to be subjected to the next cell search is notified to each mobile terminal 20a to 20d through negotiation between the base station apparatus 10 and the plurality of mobile terminals 20a to 20d (steps S28b and S30b).
- the cell search unit 22 of each of the mobile terminals 20a to 20d performs a cell search using the number of frames L.
- Other operations are the same as those in the first and second embodiments, and a description thereof will be omitted.
- the number of frames J1 to J4 is simply averaged and a margin ⁇ is added to obtain the number of frames for the next cell search.
- the maximum number of frames J1 to J4 can be set to the number L of frames for the next cell search.
- the number of frames obtained by adding the margin ⁇ to the maximum number of frames J1 to J4 can be set as the number L of frames for the next cell search. In this way, the number L of frames for the next cell search can be calculated based on the statistical information of the number of frames J1 to J4 and K1 to K4.
- the base station apparatus 10 is communicating with a plurality of mobile terminals 20a to 20d, it is possible to appropriately set the number L of frames for the next cell search.
- the cell The search period can be shortened.
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Abstract
Description
Claims (8)
- 基地局装置と通信を行う移動端末であって、
セルサーチを行い、前記セルサーチに要した期間に基づき調整されたセルサーチ期間を用いて次回のセルサーチを行うセルサーチ部を備えたことを特徴とする移動端末。 - 前記セルサーチに要した時間に関する情報を前記基地局装置に通知する通知部と、
前記調整されたセルサーチ期間に関する情報を前記基地局から取得する取得部と、を具備する請求項1記載の移動端末。 - 前記調整されたセルサーチ期間は前記セルサーチに要した期間と同じである請求項1または2記載の移動端末。
- 前記調整されたセルサーチ期間は前記セルサーチに要した期間より長い請求項1または2記載の移動端末。
- 移動端末と通信を行う基地局装置であって、
前記移動端末がセルサーチに要した期間に関する情報を、前記移動端末から取得する取得部と、
前記セルサーチに要した期間に基づき調整されたセルサーチ期間に関する情報を前記移動通信に通知する通知部と、を具備する基地局装置。 - 前記セルサーチに要した期間を前記調整されたセルサーチ期間とする請求項5記載の移動通信システム。
- 前記調整されたセルサーチ期間を、前記セルサーチに要した期間より長く設定する演算部を含むことを特徴とする請求項5記載の移動通信システム。
- 互いに無線通信を行う基地局装置と移動端末とを含む移動通信システムであって、
セルサーチを行う前記移動端末に設けられたセルサーチ部と、
前記セルサーチに要した期間に基づきセルサーチを行う期間を演算する演算部とを、具備し、
前記セルサーチ部は、前記演算部により演算されたセルサーチ期間でセルサーチを行うことを特徴とする移動通信システム。
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KR1020107029484A KR101188960B1 (ko) | 2008-06-30 | 2008-06-30 | 이동 단말기, 기지국 장치 및 이동 통신 시스템 |
CN200880130095.1A CN102077655B (zh) | 2008-06-30 | 2008-06-30 | 移动终端、基站装置以及移动通信系统 |
EP08777701.7A EP2296427B1 (en) | 2008-06-30 | 2008-06-30 | Mobile terminal, base station device and mobile communication system |
JP2010518838A JP5267562B2 (ja) | 2008-06-30 | 2008-06-30 | 移動端末、基地局装置および移動通信システム |
PCT/JP2008/061850 WO2010001452A1 (ja) | 2008-06-30 | 2008-06-30 | 移動端末、基地局装置および移動通信システム |
US12/965,079 US8565155B2 (en) | 2008-06-30 | 2010-12-10 | Mobile terminal, base station device and mobile communication system |
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KR20070081380A (ko) * | 2006-02-10 | 2007-08-16 | 삼성전자주식회사 | 이동통신 시스템에서 듀얼모드용 단말기의 핸드오버를 위한통합 타이밍 제어방법 및 장치 |
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2008
- 2008-06-30 KR KR1020107029484A patent/KR101188960B1/ko active IP Right Grant
- 2008-06-30 JP JP2010518838A patent/JP5267562B2/ja active Active
- 2008-06-30 CN CN200880130095.1A patent/CN102077655B/zh not_active Expired - Fee Related
- 2008-06-30 WO PCT/JP2008/061850 patent/WO2010001452A1/ja active Application Filing
- 2008-06-30 EP EP08777701.7A patent/EP2296427B1/en not_active Not-in-force
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2010
- 2010-12-10 US US12/965,079 patent/US8565155B2/en active Active
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017038275A (ja) * | 2015-08-11 | 2017-02-16 | Kddi株式会社 | 基地局装置、通信装置、制御方法及びプログラム |
JP2022534243A (ja) * | 2019-05-28 | 2022-07-28 | タレス ディアイエス エイアイエス ドイツ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 帯域幅が制限されたユーザ装置の改善されたローミング方法 |
JP7295277B2 (ja) | 2019-05-28 | 2023-06-20 | タレス ディアイエス エイアイエス ドイツ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 帯域幅が制限されたユーザ装置の改善されたローミング方法 |
Also Published As
Publication number | Publication date |
---|---|
US20110075610A1 (en) | 2011-03-31 |
EP2296427A4 (en) | 2014-07-30 |
EP2296427A1 (en) | 2011-03-16 |
JP5267562B2 (ja) | 2013-08-21 |
CN102077655B (zh) | 2014-09-03 |
JPWO2010001452A1 (ja) | 2011-12-15 |
KR20110022639A (ko) | 2011-03-07 |
CN102077655A (zh) | 2011-05-25 |
US8565155B2 (en) | 2013-10-22 |
EP2296427B1 (en) | 2016-10-05 |
KR101188960B1 (ko) | 2012-10-08 |
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