WO2010090232A1 - 移動局、無線通信システム、セルidの異常検出方法およびプログラム - Google Patents
移動局、無線通信システム、セルidの異常検出方法およびプログラム Download PDFInfo
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- WO2010090232A1 WO2010090232A1 PCT/JP2010/051535 JP2010051535W WO2010090232A1 WO 2010090232 A1 WO2010090232 A1 WO 2010090232A1 JP 2010051535 W JP2010051535 W JP 2010051535W WO 2010090232 A1 WO2010090232 A1 WO 2010090232A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0083—Multi-mode cell search, i.e. where several modes or systems can be used, e.g. backwards compatible, dual mode or flexible systems
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- the present invention relates to a mobile station, a radio communication system, a cell ID abnormality detection method, and a program, and in particular, a mobile station having a cell ID abnormality detection function in an environment where reference signals are not synchronized between adjacent cells,
- the present invention relates to a radio communication system, a cell ID abnormality detection method and a program.
- LTE Long Term Evolution
- cell ID physical cell ID
- the cell ID in LTE has a restriction that 504 cell IDs must be repeatedly used due to limitations such as the number of bits.
- the cell ID assignment must satisfy the following two conditions. a. Adjacent cells should not have the same cell ID. b. Also, cells adjacent to a certain cell should not have the same cell ID. A technique for automating cell allocation so as to satisfy the above two points has been studied.
- FIG. 4 shows the condition b. Above using the method (2) above. This is a sequence when it is detected that a cell ID contrary to is set.
- FIG. 5 is a sequence when it is detected using the method (2) that a Cell ID contrary to the condition a is set. As described above, it is possible to detect that a cell ID contrary to the above two conditions is set by using a report from an adjacent base station.
- the method using the report from the neighboring base station (2) can be adopted only when there is a communication network for reporting neighboring cell IDs to each other.
- FIG. 6 there is a communication line (broken line in the figure) between the base stations AB and AC, indicating that the same cell ID is set in the cells A and B. Although there is no communication line between the base stations B and C, there is no way to detect that the same cell ID is set in the cells C and D.
- Non-Patent Document 2 proposes a method for detecting the setting of the same cell ID using the report from the UE (1) to the base station.
- the detection method of the setting of the same cell ID of the nonpatent literature 2 is demonstrated using FIG.
- the cell C periodically transmits a reference signal (Reference Signal; hereinafter abbreviated as “RS”).
- RS Reference Signal
- the cell D is a cell in which the same cell ID as that of the cell C has been set, and the RS is periodically transmitted in synchronization with the cell C.
- RS is a signal that is assigned 180 kHz and transmitted 8 times per 1 ms in LTE, and is used for measurement of reception quality at the UE.
- Cell C and cell D are assumed to be in a synchronized state in which the same signal is transmitted at the same time as shown in FIG.
- the UE in the cell C range demodulates and decodes other received signals that are modulated and encoded based on the RS reception quality reported to the base station.
- the RS is arranged at a frequency unique to the cell ID.
- the RS is composed of a code unique to the cell ID. Accordingly, the UE cannot distinguish between RSs transmitted from two cells having the same cell ID except for the reception time.
- the cells C and D periodically transmit broadcast information through a BCH (broadcast channel), which has information unique to the cell. Since the information includes information such as regulations and radio channel settings, for example, the broadcast information transmitted from the cell C and the cell D in FIG. 7 may include other information.
- BCH broadcast channel
- the UE can receive the RS and the broadcast information transmitted from the cell C and the cell D at the same time (t1, t2).
- T_offset_x is an RS transmission offset value in cell X
- n is the number of RS transmissions
- T_RS_period is an RS transmission interval.
- the RS transmission count n and the RS transmission interval T_RS_period are unique regardless of the cell.
- the received power of the UE is larger than that of the RS received from one cell. This is because the spatial diversity effect of receiving the same RS from different cells at the same time can be obtained.
- the contents of the broadcast information differ between cell C and cell D. Therefore, even if the UE receives broadcast information, the UE cannot understand the content of the signal due to interference. As described above, the UE stores the occurrence of an event in which the decoding of the broadcast information has failed even though the RS reception power is higher than normal as the same cell ID detection condition.
- the UE notifies the base station of the stored contents. By this.
- the base station knows that the previously described condition a or condition b is not satisfied in the vicinity of the cell that received the report (although not necessarily adjacent).
- 3GPP RAN WG2, R1-075099 “Response to LS on Physical-layer Cell IDentity Collation”, [online], [Search January 29, 2009], Internet ⁇ URL: http://www.3gpp.org/ ftp / tsg_ran / WG1_RL1 / TSGR1_51 / Docs / R1-075099.zip> 3GPP RAN WG2, R2-085380, “UE-assisted heuristic detection of PCI collation”, [online], [searched on January 29, 2009], Internet ⁇ URL: http://www.3gpp.org/ftp/ tsg_ran / WG2_RL2 / TSGR2_63bis / Docs / R2-085380.zip>
- Non-Patent Document 2 has the following problems.
- the first problem is that the same cell ID cannot be detected in an asynchronous manner between cells because it assumes inter-cell synchronization.
- asynchronous between cells means that the RS transmission times do not match. If cell C and cell D are in an asynchronous relationship between cells, the RS transmission offset value T_offset_d of cell D does not match the RS transmission offset value T_offset_c of cell C, and the RS transmission time T_RS_d and T_RS_c do not match.
- the UE receives and decodes the broadcast information of the cell C at the time t13 when it receives the RS of the cell C previously transmitted at the time t11. Thereafter, the UE makes a call connection with the cell C.
- the two RSs do not obtain a diversity effect.
- the UE can receive the broadcast information of the cell C without receiving interference.
- Non-Patent Document 2 does not report the same cell ID from the UE.
- the UE is connected to the cell C by a call. Further, the UE is synchronized with the cell C.
- the synchronization between the UE and the cell means that the actual RS reception time matches the RS reception time expected by the UE.
- the UE-cell C is out of synchronization for some reason, such as the outlook between the UE and the base station deteriorates, or the UE passes through a point with much interference (out of synchronization in FIG. 9).
- the UE should receive the next RS transmitted from the cell C shown in the upper part of FIG. However, the UE detects and synchronizes the same RS from the cell D transmitted earlier.
- the object of the present invention is to provide a method capable of detecting that the same cell ID is set in the inter-cell asynchronous using the above-described unique event in the inter-cell asynchronous.
- a mobile station capable of reporting an abnormality of a cell ID in an environment where reference signal synchronization is not guaranteed between adjacent cells.
- This mobile station stores the occurrence of an event in which the call connection is released after the reference signal is out of synchronization with the cell being connected to the call and the cell is again synchronized with the cell having the same ID.
- a means for notifying the base station of the occurrence of the event together with the cell ID when the next call connection is made.
- the call connection is released after the reference signal with the cell being connected to the call is out of synchronization and the cell with the same ID is synchronized again. And the step of notifying the base station of the occurrence of the event together with the cell ID when the next call connection is established, and synchronization of reference signals is ensured between adjacent cells.
- a method for detecting an abnormality of a cell ID in a non-environment is provided.
- the call connection is released after the reference signal with the cell in the call connection is out of synchronization and the cell with the same ID is synchronized again.
- the process of storing the occurrence of the event and the process of notifying the base station of the occurrence of the event together with the cell ID when the next call connection is made is executed by a computer installed in the mobile station, and the adjacent cell A program is provided for reporting cell ID anomalies in an environment where reference signal synchronization is not guaranteed.
- the present invention it is possible to detect an abnormality of a cell ID in an environment where reference signals are not synchronized between adjacent cells using a mobile station without using a method based on a report from an adjacent base station. It becomes.
- FIG. 1 It is a figure for demonstrating the outline
- FIG. It is a figure for demonstrating the case where it cannot detect with the abnormality detection method of the cell ID of a nonpatent literature 2.
- FIG. It is a figure for demonstrating the peculiar phenomenon in the environment where the synchronization of the reference signal is not taken between adjacent cells.
- the UE reports the occurrence of the event together with the cell ID to the base station.
- FIG. 2 is a block diagram showing configurations of a mobile station (UE) and a base station according to the first embodiment of the present invention.
- the mobile station (UE) 10 includes a call processing unit 11 and an RS synchronization unit 12.
- the call processing unit 11 performs signal transmission and reception for call connection with a cell (base station), and stores the cell ID in which the event has occurred when the same cell ID detection condition described later is satisfied in a memory (not shown). Then, when the connection is made again, the base station 20 is notified that the same cell ID is detected in a specific cell.
- the same cell ID detection condition is satisfied when the following (1) to (3) occur.
- (1) The reference signal is out of synchronization with the cell being connected to the call (2) Thereafter, the cell and the cell with the same ID are synchronized (3) Thereafter, the call is released from the cell with the same ID What happened
- the RS synchronization unit 12 receives the RS, and confirms that synchronization between the UE and the cell is established.
- the RS synchronization unit 12 notifies the call processing unit 11 when the UE-cell synchronization is achieved and when the UE-cell synchronization is lost.
- the base station 20 includes a call processing unit 21 and an RS transmission unit 22.
- the call processing unit 21 performs signal transmission / reception for call connection with the UE 10.
- the RS transmission unit 22 performs RS transmission according to the settings of cell ID, RS transmission offset, RS transmission interval, and RS frequency arrangement.
- FIG. 3 is a sequence diagram showing operations of the mobile station (UE) and the base station according to the first embodiment of the present invention.
- the RS synchronization unit 12 of the UE 10 receives the RS transmitted from the cell C, and the UE 10 and the cell C are in a synchronized state (step S001).
- the RS synchronization unit 12 of the UE 10 notifies the call processing unit 11 of the UE 10 that UE-cell synchronization has been achieved (step S002).
- This notification includes the cell ID.
- a signal related to call connection is transmitted and received between the call processing unit 11 of the UE 10 that has received the notification and the call processing unit 21 of the base station 20A, and a call connection state is established (step S003).
- the RS synchronization unit 12 of the UE 10 detects that the synchronization between the UE and the cell C is lost (step S004).
- the RS synchronization unit 12 of the UE 10 When the loss of synchronization between the UE and the cell C is detected, the RS synchronization unit 12 of the UE 10 notifies the call processing unit 11 of the UE 10 that the synchronization between the UE and the cell has been lost (step S005).
- the RS synchronization unit 12 of the UE 10 detects the RS from the cell D, and the UE 10 and the cell D are in a synchronized state (step 006). Since the cell IDs of the cell C and the cell D are the same, the RS from the cell D and the RS from the cell C are the same except for the transmission time (depending on the RS transmission offset). Originally, the RS of the cell C should be detected and re-synchronized with the cell C, but the RS of the cell D detected first is received due to a different RS transmission offset.
- the RS synchronization unit 12 of the UE 10 notifies the call processing unit 11 of the UE 10 that the UE-cell synchronization has been established (step S007).
- This notification includes the cell ID. Since the cell IDs of the cell C and the cell D are the same, at this point, the UE 10 cannot distinguish whether the synchronized cell is the cell C or the cell D.
- the call processing unit 11 of the UE 10 that has received the notification tries to maintain a call connection with the call processing unit 21 of the base station 20B. However, since there is no call with UE10 in the cell D, call connection continuation fails and the call is released (step S008).
- the fact that the call has been released is stored (step S009; the same cell ID detection condition is established).
- the RS synchronization unit 12 of the UE 10 receives the RS transmitted from the cell C, and the UE 10 and the cell C are in a synchronized state (step S101).
- the cell to be synchronized may be the cell D or another cell.
- the RS synchronization unit 12 of the UE 10 notifies the call processing unit 11 of the UE 10 that UE-cell synchronization has been achieved (step S102).
- a signal related to call connection is transmitted and received between the call processing unit 11 of the UE 10 that has received the notification and the call processing unit 21 of the base station 20A, and a call connection state is established (step S103).
- the mobile station (UE) of the first embodiment described above can also have the same cell ID detection function described in Non-Patent Document 2. In this way, it is possible to obtain a mobile station that can detect the setting of the same cell ID when a certain event occurs regardless of whether or not the cells are synchronized.
- the examples and the examples can be changed and adjusted based on the basic technical concept.
- Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.
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Abstract
Description
本発明は、移動局、無線通信システム、セルIDの異常検出方法およびプログラムに関し、特に、隣接するセル間において参照信号の同期が取れていない環境におけるセルIDの異常検出機能を備えた移動局、無線通信システム、セルIDの異常検出方法およびプログラムに関する。
a.隣接したセルは同一のセルIDを持つべきでない。
b.またあるセルに隣接するセル同士は同一のセルIDを持つべきではない。
上記2点を満たすようにセル割り当てを自動化する手法が検討されている。
1.上記2条件を満たすような配置
2.不運にも2条件を満足しなかったときの検出(Physical Cell ID Collisionの検出;非特許文献1参照)
(1)移動局(User Entity、以下、UEと略する。)からの基地局への報告を利用する
(2)隣接基地局からの報告を利用する
しかしながら、上記非特許文献2の同一セルID検出方法においては、次のような課題がある。第1の課題は、セル間同期を前提としているため、セル間非同期における同一セルIDを検出できないということである。
UEとセルの同期とは実際のRS受信時間とUEが期待するRS受信時間が一致することを指す。
続いて、本発明の第1の実施形態について図面を参照して詳細に説明する。図2は、本発明の第1の実施形態に係る移動局(UE)と基地局の構成を表したブロック図である。
(1)呼接続中のセルとの参照信号の同期が外れたこと
(2)その後、当該セルと同一IDのセルとの同期が取れたこと
(3)その後、同一IDのセルから呼解放されてしまったこと
本発明の全開示(請求の範囲を含む)の枠内において、さらにその基本的技術思想に基づいて、実施例ないし実施例の変更・調整が可能である。また、本発明の請求の範囲の枠内において種々の開示要素の多様な組み合わせないし選択が可能である。すなわち、本発明は、請求の範囲を含む全開示、技術的思想にしたがって当業者であればなし得るであろう各種変形、修正を含むことは勿論である。
11 呼処理部
12 RS同期部
20 基地局
21 呼処理部
22 RS送信部
Claims (7)
- 呼接続中のセルとの参照信号の同期が外れ、再度、当該セルと同一IDのセルとの同期が取れた後に、前記呼接続が解放されてしまった事象の発生を記憶する手段と、
次に、呼接続した際に、セルIDとともに前記事象の発生を基地局に通知する手段とを備える移動局。 - 呼接続中のセルとの参照信号の同期が外れ、再度、当該セルと同一IDのセルとの同期が取れた後に、前記呼接続が解放されてしまった事象は、
移動局が、同一のセルIDが設定された2つの基地局から送信された同一の参照信号のうち、第1の基地局から送信された参照信号にて同期して呼接続状態となった後、同期が取れなくなり、次に、第2の基地局から送信された参照信号にて同期した後、第2の基地局から呼解放されることにより発生する請求項1の移動局。 - セルと呼接続するための信号送受信を行う呼処理部と、
セルから受信した参照信号に基づいてセルとの同期が取れているか否かを前記呼処理部に通知する参照信号受信部と、を備え、
(1)呼接続中のセルとの参照信号の同期が外れたこと、
(2)その後、当該セルと同一IDのセルとの同期が取れたこと、
(3)その後、同一IDのセルから呼解放されてしまったこと、
前記(1)から(3)の条件が成立した場合に、メモリにセルIDを記憶し、次に、任意の基地局と呼接続した際に、前記セルIDとともに同一セルIDが設定されていること、前記基地局に通知し、
隣接するセル間において参照信号の同期が保証されていない環境におけるセルIDの異常を報告できる移動局。 - さらに、
参照信号の受信電力が所定のしきい値を超え、かつ、報知情報が復号できなかった第2の事象の発生を記憶し、次に、呼接続した際に、セルIDとともに前記第2の事象の発生を基地局に通知する機能を備えた請求項1から3いずれか一に記載の移動局。 - 請求項1から4いずれか一の移動局を含む無線通信システム。
- 呼接続中のセルとの参照信号の同期が外れ、再度、当該セルと同一IDのセルとの同期が取れた後に、前記呼接続が解放されてしまった事象の発生を記憶するステップと、
次に呼接続した際に、セルIDとともに前記事象の発生を基地局に通知するステップとを含み、
隣接するセル間において参照信号の同期が保証されていない環境におけるセルIDの異常検出方法。 - 呼接続中のセルとの参照信号の同期が外れ、再度、当該セルと同一IDのセルとの同期が取れた後に、前記呼接続が解放されてしまった事象の発生を記憶する処理と、
次に呼接続した際に、セルIDとともに前記事象の発生を基地局に通知する処理とを移動局に搭載されたコンピュータに実行させ、
隣接するセル間において参照信号の同期が保証されていない環境におけるセルIDの異常を報告させるプログラム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP10738563A EP2395783A1 (en) | 2009-02-04 | 2010-02-03 | Mobile station, wireless communication system, method of detecting abnormal cell id, and program |
CN2010800064431A CN102308615A (zh) | 2009-02-04 | 2010-02-03 | 移动站、无线通信系统、小区id的异常检测方法以及程序 |
US13/147,681 US20110287760A1 (en) | 2009-02-04 | 2010-02-03 | Mobile station, wireless communication system, inappropriate cell id detection method, and program |
JP2010549497A JP5088422B2 (ja) | 2009-02-04 | 2010-02-03 | 移動局、無線通信システム、セルidの異常検出方法およびプログラム |
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US8885517B2 (en) | 2012-02-16 | 2014-11-11 | Giri Prassad Deivasigamani | Operational state mismatch identification for a mobile device |
WO2013185318A1 (en) * | 2012-06-14 | 2013-12-19 | Nokia Siemens Networks Oy | Fast recovering for network listening schemes in synchronization over air for small cells |
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US6766291B2 (en) * | 1999-06-18 | 2004-07-20 | Nortel Networks Limited | Method and apparatus for controlling the transition of an audio signal converter between two operative modes based on a certain characteristic of the audio input signal |
AU2001296968A1 (en) * | 2000-09-29 | 2002-04-08 | Varitek | Telematics system |
EP1330133A1 (de) * | 2002-01-17 | 2003-07-23 | Siemens Aktiengesellschaft | Funkkommunikationssystem |
US7415273B2 (en) * | 2004-04-09 | 2008-08-19 | Motorola, Inc. | Efficient system and method of monitoring neighboring cells in a communication system |
FI117587B (fi) * | 2004-06-18 | 2006-11-30 | Nethawk Oyj | Menetelmä, laite ja tietokoneohjelmatuote tiedonsiirtoyhteyksien monitorointiin |
US8565753B2 (en) * | 2007-11-09 | 2013-10-22 | Nec Corporation | Radio communication system, method and program |
US8929894B2 (en) * | 2009-01-06 | 2015-01-06 | Qualcomm Incorporated | Handover failure messaging schemes |
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- 2010-02-03 CN CN2010800064431A patent/CN102308615A/zh active Pending
Non-Patent Citations (2)
Title |
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NOKIA SIEMENS NETWORKS ET AL.: "Solution(s) to the 36.902's Automated Configuration of Physical Cell Identity Use Case", 3GPP TSG-RAN WG3 MEETING #59-BIS, R3-080812,, XP050164010, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG3_Iu/TSGR3_59bis/docs/R3-080812.zip> [retrieved on 20100224] * |
QUALCOMM EUROPE: "UE-assisted heuristic detection of PCI collision", 3GPP TSG-RAN WG2 #63BIS, R2-085380, 3 October 2008 (2008-10-03), XP050320229, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR263bis/Docs/R2-085380.zip> [retrieved on 20100224] * |
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US20110287760A1 (en) | 2011-11-24 |
CN102308615A (zh) | 2012-01-04 |
JP5088422B2 (ja) | 2012-12-05 |
JPWO2010090232A1 (ja) | 2012-08-09 |
EP2395783A1 (en) | 2011-12-14 |
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