WO2004084564A1 - Procede de detection d'un acces aleatoire d'un equipement utilisateur - Google Patents
Procede de detection d'un acces aleatoire d'un equipement utilisateur Download PDFInfo
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- WO2004084564A1 WO2004084564A1 PCT/CN2004/000218 CN2004000218W WO2004084564A1 WO 2004084564 A1 WO2004084564 A1 WO 2004084564A1 CN 2004000218 W CN2004000218 W CN 2004000218W WO 2004084564 A1 WO2004084564 A1 WO 2004084564A1
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- Prior art keywords
- correlation
- window
- threshold
- satisfied
- user terminal
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 96
- 238000010295 mobile communication Methods 0.000 claims abstract description 14
- 238000004088 simulation Methods 0.000 claims description 53
- 238000001514 detection method Methods 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 5
- 230000002596 correlated effect Effects 0.000 abstract description 7
- 230000000875 corresponding effect Effects 0.000 description 25
- 239000013598 vector Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/70755—Setting of lock conditions, e.g. threshold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/70754—Setting of search window, i.e. range of code offsets to be searched
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
Definitions
- the present invention relates to wireless mobile communication technology, and more particularly, to a method for detecting a user terminal (UE) random access to a mobile communication system.
- a base station applying the method can detect a user terminal or a simultaneous detection of random access. Out multiple user terminals with random access.
- FIG. 1 shows a mobile communication system composed of a base station (BS) and n (n is a positive integer) user terminals (delete 1, delete 2, ..., UEn).
- BS base station
- n is a positive integer
- the uplink synchronization of each user terminal is generally established through the following steps: (1) Each user terminal (UE) sends a specific uplink synchronization random connection on the uplink. (2) The uplink timing information of each user terminal is obtained at the base station (BS) by detecting each uplink synchronous random access signal, and the base station then transmits the timing to each user terminal through a specific downlink channel (such as FACH). Synchronization adjustment command (synchronization adjustment information); (3) Each user terminal adjusts its own timing according to this command, and accesses on a specific access channel (such as RACH).
- a specific downlink channel such as FACH.
- the uplink synchronous random access signal of each user terminal usually uses an orthogonal or quasi-orthogonal pseudo-random sequence code (PN).
- PN pseudo-random sequence code
- the orthogonality of the sequence code allows the base station to detect the simultaneous access of user terminals by detecting the uplink synchronization signals sent by each user terminal in the environment of a mobile channel.
- a group (N) of orthogonal or quasi-orthogonal pseudo-random sequence codes ⁇ , 2 ... ⁇ (vector) can be allocated to In the base station, one of the orthogonal or quasi-orthogonal pseudo-random sequence codes will be selected by one of the user terminals in the group.
- the set of orthogonal or quasi-orthogonal pseudo-random sequence codes satisfies the following related characteristic relationships:
- the uplink synchronous random access signal sent by the user terminal contains a pseudo-random sequence code.
- the base station can use direct sequence convolution (linear correlation) or matched filtering, etc. using the relevant characteristics of the pseudo-random sequence code.
- direct sequence convolution linear correlation
- matched filtering etc.
- a variety of mature related operation methods, and a series of corresponding judgment conditions are combined to detect the uplink synchronization signal of each user terminal.
- the purpose of the present invention is to design a method for detecting random access of user terminals, which can quickly and accurately implement simultaneous detection of random access by one or more user terminals.
- a method for detecting random access of user terminals which is applied to a mobile communication system composed of at least one base station and a group of user terminals, the base station and the group of user terminals
- a set of N orthogonal or quasi-orthogonal pseudo-random sequence codes is used as the random access of the user terminal, and the base station-to-user terminal is realized by detecting the pseudo-random sequence code selected by each randomly accessed user terminal.
- Simultaneous detection of random access, N is a positive integer, and is characterized by including the following steps:
- the base station correlates the received random access signal of the user terminal containing the pseudo random sequence code information selected by the access user terminal at the same time with a pseudo random sequence code in the pseudo random sequence code group local to the base station. Operating to obtain a corresponding correlation result window, the correlation operation starts from any pseudorandom sequence code in the pseudorandom sequence code group, and continues until all N pseudorandom sequence codes are operated;
- each correlation peak point divides the correlation peak value window in the corresponding correlation result window, or divide the correlation peak window and the front and back side windows of the correlation peak window in the correlation result window;
- step D Select one or more thresholds, compare and judge one or more conditions with the correlation results in each correlation peak window or with the correlation peak window and the front and back side windows, and when the corresponding judgment conditions meet the one or more
- the pseudo-random sequence code involved in the relevant operation in step A is a pseudo-random sequence code selected by an access user terminal at that moment.
- a method for detecting random access of a user terminal is applied to a mobile communication system composed of at least one base station and a group of user terminals, the base station and the group of users
- the terminal uses a set of N orthogonal or quasi-orthogonal pseudo
- the random sequence code is used for random access of user terminals.
- N is a positive integer. Its characteristics It consists of the following steps:
- the base station correlates the received random access signal of the user terminal containing the pseudo-random sequence code information selected by the access user terminal to a pseudo-random sequence code in the local pseudo-random sequence code group of the base station at the same time. To obtain the corresponding relevant result window;
- step D1. Select one or more thresholds, and compare and judge one or more conditions with the corresponding correlation results in the correlation peak window or with the correlation peak window and the front and back side windows. When the corresponding judgment judgment conditions meet the selected At one or more thresholds, it is determined that the pseudo-random sequence code involved in the relevant operation in step A is a pseudo-random sequence code selected by an access user terminal at that moment.
- the step A1 starts from any pseudo-random sequence code in the pseudo-random sequence code group to perform related operations with the random access signal of the user terminal; when the condition is met or not satisfied, the step D1 returns Step A1: Select another pseudo-random sequence code different from the pseudo-random sequence code currently in operation from the pseudo-random sequence code group to perform related operations with the random access signal of the user terminal until all N pseudo-random sequences are operated. code.
- the number N of pseudo-random sequence codes in the pseudo-random sequence code group is a variable or fixed number of at least 1.
- the steps and related operations in A1 include:
- the base station performs Fourier transform on the received access signal from the user terminal to obtain a Fourier transform result
- the tomb station performs Fourier transform on the pseudo-random sequence codes in the local pseudo-random sequence code group to obtain the Fourier transform result: 3)
- the base station uses the Fourier transform result obtained in step 1) and the Fourier transform result obtained in step 2) to obtain a correlation operation result through a dot multiplication operation, and performs an inverse Fourier transform on the correlation operation result;
- Obtaining a correlation result window in steps A and A1 includes: taking a norm for each element in the inverse Fourier transform result obtained in step 3), and deriving a correlation result window from the norm.
- the norm taking includes the correlation result derived from the norm in the form of power or absolute amplitude.
- step 3 the correlation operation result is obtained by a dot multiplication operation, and a correlation operation including direct sequence correlation or matched filter correlation is performed in a correlator.
- step 8 B1 when the correlation result window in the form of power is obtained, the point with the highest power is found in the correlation power window as the correlation peak point; when the correlation result window in the form of absolute amplitude is obtained , Find the point with the largest absolute amplitude in the correlation absolute amplitude window as the correlation peak point.
- the step ( ⁇ C1 includes: 1) giving the correlation peak window window length through the simulation process; 2) giving the relationship between the window length on both sides of the maximum correlation peak point and the correlation peak window window length through the simulation process; 3) passing The simulation process gives the window length of the front and rear side windows; 4) According to the results of step 1) and step 2), the position of the correlation peak window containing the maximum correlation peak point is divided; 5) According to the results of step 3) and step 4), divide Position the front and rear side windows.
- the window length on one side of the maximum correlation peak point is 1/3 of the window length of the correlation peak window, and the window length on the other side of the maximum correlation peak point is 2/3 of the window length of the correlation peak window;
- the window lengths of the front and rear side windows given in step 3) may be equal or unequal.
- the steps D and D1 include:
- dll respectively calculate the average value of the correlation results in the front and back sides of the correlation peak window, and / or the total value, and / or the effective average value after removing the interference, and / or the effective total value after removing the interference, and respectively Find the peak at the relevant peak point and the two averages or the total value, and / or valid The difference between the mean, and / or the effective total;
- step dl2 setting thresholds corresponding to various differences calculated in step dll through the simulation process
- d54 when the number of statistics is less than the number threshold, it is further determined that the condition is satisfied, otherwise it is determined that the condition is not satisfied; or d61) a threshold is given through the simulation process;
- step d64 when the number of statistics in step d62 is less than the threshold of the number of step d63, it is further determined that the condition is satisfied, otherwise it is determined that the condition is not satisfied; or
- step d74 the number of relevant result points whose statistical difference is less than the threshold value of step d71; d75) a threshold corresponding to the number is given through the simulation process;
- the invention is a new method for detecting random access of one or more user terminals in a mobile communication system.
- the mobile communication system includes at least one base station and a group of user terminals.
- the base station and the group of user terminal devices are assigned a group (N) of orthogonal or quasi-orthogonal pseudo-random sequence codes, and each user terminal randomly selects the group of pseudo-random codes.
- One of the sequence codes is used for random access; the base station uses the orthogonality of the set of pseudo-random sequence codes and uses the detection method of the present invention to detect the pseudo-random sequence code selected by each randomly accessed user terminal.
- the base station can detect the random access of one or more user terminals simultaneously.
- the access signal vector ⁇ , which contains one or more pseudo-random sequence codes in the pseudo-random sequence code group randomly selected or designated by the user terminal
- the pseudo-random sequence code are sent to the user terminal at the same time.
- Correlation operation is performed on each pseudo-random sequence code in the group (N correlation operations in total), and the maximum correlation peak point of each operation in the results of N correlation operations, or the maximum correlation of each operation in the results of N correlation operations.
- the peak point and the correlation peak points in the front and back side windows, and / or the average power value of each correlation point within a certain window range of these correlation peak points, the total power value of each correlation point, and the total effective power of each correlation point The value, the average effective power value of each correlation point, and / or the corresponding difference value are compared with a threshold obtained through the simulation process; and / or the number of correlation points in a correlation result that exceeds a certain threshold value is compared, Compare to a given threshold or thresholds.
- a pseudo-random sequence code selected by one or more user terminals that are accessed simultaneously and randomly at the moment is detected, so that one or more user terminals that are accessed simultaneously and randomly at the moment are detected.
- the invention adopts the calculation method of the correlation window, the correlation peak window, and the selection method of the front and back side windows to detect one or multiple randomly selected or designated pseudo-random sequence codes as a user terminal for random access. Detection of single or multiple user terminals simultaneously random access.
- the detection method provided by the present invention As long as the appropriate phase is selected Given a reasonable one or more detection thresholds, due to the special setting of the peak window, the multipath information is included in the peak window as much as possible, and other interference is excluded from the peak window as much as possible. Therefore, the multipath information that may exist in the access signals of each user terminal is used, thereby improving the reliability and accuracy of detection; at the same time, it is natural to implement the method for one or more users by using the method provided by the present invention. Simultaneous detection of simultaneous random access by terminals. Brief description of the drawings
- FIG. 1 is a schematic structural diagram of a mobile communication system composed of a base station and n user terminals;
- FIG. 2 is a schematic diagram of a random access process of a user terminal
- FIG. 3 is a flowchart of an embodiment of detecting random access of a user terminal according to the present invention
- FIG. 4 is a schematic diagram of division of a correlation peak window, front and back side windows in a correlation window, and comparison with a given threshold condition.
- the base station In a mobile communication system consisting of at least one base station and a group of user terminals, the base station has a set (N) of orthogonal or quasi-orthogonal pseudo-random sequence codes m x , m 2 ⁇ ⁇ ⁇ m N , a certain user terminal One (or more) pseudo-random sequence codes are selected for access.
- N orthogonal or quasi-orthogonal pseudo-random sequence codes
- the base station will receive random access signals sent by these user terminals ⁇
- This signal contains codes randomly selected by each user terminal Information (several ⁇ J.
- the present invention is based on the orthogonality of the pseudo-random sequence code.
- the base station determines the pseudo-random sequence code group, m 2 ⁇ m N for each pseudo-random sequence code and the received signal ⁇ Perform a correlation operation, and finally obtain the x information contained in the signal ⁇ ig according to the detection of the correlation peak.
- N is the number of pseudo-random sequence codes in the orthogonal or quasi-orthogonal pseudo-random sequence code group
- FIG. 3 an implementation process of a base station detecting random access by a user terminal is shown.
- a pseudo-random sequence code selected by each access terminal at the same time can be determined, that is, all terminals accessed at the same time are detected.
- This embodiment is applied to a TD-SC Luo A (Time Division-Synchronous Code Division Multiple Access) system, and uses matched filtering for correlation operations. And detecting random access of the user terminal according to a related operation result. All the terminals randomly accessed at the same time can be detected by performing only N related operations, and the maximum number is N terminals.
- TD-SC Luo A Time Division-Synchronous Code Division Multiple Access
- Step 301 The base station performs Fourier transform (FFT) on the received access signal ⁇ from the user terminal including a pseudo-random sequence code randomly selected by each user terminal:
- FFT Fourier transform
- FFT Fourier transform
- Step 304 The base station uses a matched filtering method to perform a correlation operation on the signals ⁇ and ⁇ signals (both sequence signals) that have undergone the FFT transformation in the foregoing steps, that is, perform a dot multiplication operation to obtain a correlation operation result f (vector):
- Step 305 Perform an inverse Fourier transform (IFFT) transformation on the above-mentioned correlation operation result to obtain a result (vector):
- IFFT inverse Fourier transform
- the result window is a correlation result window in the form of power (herein, only the related result window in the form of power is explained, and the related result window in the form of absolute amplitude has the same processing process);
- Step 307 Determine the size and position of the peak point (peak) in the correlation power (or absolute amplitude) window (Pi window), the size and position of the peak window Lp (L1 + L2), and the size of the front and rear side windows Ls l, Ls2 and The position and the like are described in detail with reference to FIG. 4:
- the length setting should be Several major multipaths containing signals are scales, and the window lengths Lsl and Ls2 of the front and back side windows outside the peak window are given by means of simulation;
- step 308 the power points included in the front and rear side windows are summed respectively and divided by the respective window lengths Lsl and Ls2 to calculate the average power values of the front and back side windows Pavel and Pave2.
- step 309 the judgment of condition 1 is performed: Set the first threshold T1, according to the following conditions
- Steps 310 and 311 Determine the condition 2:
- condition 1 it is also possible to make only the judgment of condition 1.
- condition 1 the user can be determined.
- the pseudo-random sequence code randomly selected by the terminal is ⁇ , but its accuracy is definitely lower than the double judgment of condition 1 and condition 2;
- condition 1 there may be multiple determinations for condition 1, and one of them may be selected or several of them may be executed to replace steps 308 and 309.
- the calculated Pavel and Pave2 can be the total power of the relevant power in the front and rear side windows, the effective average power after removing interference, and the effective total power after removing interference, but the corresponding threshold T1 is also adjusted through the simulation process.
- One of the above items may be selected or several of them may be executed, that is, the judgment of one condition or multiple conditions;
- the total power, average power, effective total power, and effective average power of the correlation power in the peak window can be obtained separately, and the total power, average power, and effective total power of the correlation power in the front and rear side windows, respectively.
- the difference between the power and the effective average power The corresponding threshold T1 is adjusted through the simulation process, and the above difference is compared with the corresponding threshold. When the threshold is greater than the threshold, the condition is met.
- One of the above items can be selected or several of them can be executed. That is, the judgment of one condition or multiple conditions;
- the threshold T1 compares the above average power, total power, effective average power, and effective total power with corresponding thresholds respectively. When the thresholds are greater than the thresholds to meet the conditions, one of the above items can be selected or several of them can be implemented, that is, a condition. Judgment of one or more conditions;
- the process adjusts the corresponding threshold T1, and compares the above average power, total power, effective average power, and effective total power with the corresponding threshold T1. When the threshold is greater than the threshold, the condition is satisfied.
- One or several of the above items can be selected. Execution, which is the judgment of one or more conditions.
- the effective value involved is a value after interference is removed, and an average interference value and a total interference value of the entire correlation power window can be calculated by using a correlation portion remaining after removing a peak window and two side windows in the entire correlation power window.
- the effective total value and effective average value in the relevant power window can be obtained.
- condition 1 there may be multiple determinations for condition 1, and one of them may be selected or several of them may be executed to replace steps 308 and 309.
- condition 2 there may also be multiple determinations for condition 2. One of them may be selected or several of them may be selected for execution instead of steps 310 and 311.
- the number of relevant power points in a relevant power window that exceeds a certain threshold is first counted, and then compared with the set number threshold (obtained through the simulation process).
- the number threshold is met, the condition is met;
- the barcode is used to detect the simultaneously accessed user terminals, and based on this, a connection between the base station and each user terminal is established, and random access of each user terminal is achieved.
- the method of the present invention can overcome these problems, can quickly detect the received signal, and can realize the accuracy and reliability of the detection.
- a user terminal uses a randomly selected pseudo-random sequence code to access and establish a connection with a base station
- two or more user terminals may select the same pseudo-random sequence code and the same one in the same frame.
- the base station performs simultaneous access. In the random access process, the base station distinguishes each user terminal accessed in the same frame according to the pseudo-random sequence code. Therefore, when the above situation occurs, the base station cannot distinguish these users who have selected the same pseudo-random sequence code. Terminal, causing a conflict when a user terminal randomly accesses.
- the base station still normally responds to the conflicting user terminal in the event of a conflict, it will inevitably cause reception confusion between these user terminals and the base station, causing interference between the conflicting user terminals and the conflicting user terminals to other user terminals, affecting The entire system works.
- the method of the present invention when executed, that is, after performing step 306, it is better to first detect the random access conflict of the multi-user terminal, and when it is determined that there is no random access conflict of the multi-user terminal, then detect the random access user. terminal.
- the pseudo-random sequence code involved in the operation related to the random access signal in step 304 is randomly selected by two or more user terminals to access, and there is an access conflict. The subsequent operation of determining the pseudo-random sequence code selected by the user is not performed.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP04721451.5A EP1605710B1 (en) | 2003-03-18 | 2004-03-18 | Method for detecting the random access of user equipment |
US11/230,297 US7554955B2 (en) | 2003-03-18 | 2005-09-19 | Method for detecting random access of user equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CNB031191746A CN1275485C (zh) | 2003-03-18 | 2003-03-18 | 一种用于检测用户终端随机接入的方法 |
CN03119174.6 | 2003-03-18 |
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US11/230,297 Continuation US7554955B2 (en) | 2003-03-18 | 2005-09-19 | Method for detecting random access of user equipment |
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PCT/CN2004/000218 WO2004084564A1 (fr) | 2003-03-18 | 2004-03-18 | Procede de detection d'un acces aleatoire d'un equipement utilisateur |
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US (1) | US7554955B2 (zh) |
EP (1) | EP1605710B1 (zh) |
CN (1) | CN1275485C (zh) |
WO (1) | WO2004084564A1 (zh) |
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CN1080047C (zh) * | 1996-03-05 | 2002-02-27 | Ntt移动通信网株式会社 | 移动通信系统中的信号传输方法,发射机,接收机和扩展码同步法 |
US6442189B1 (en) * | 1998-01-14 | 2002-08-27 | Lg Electronics, Inc. | Binary code phase offset calculation method and a binary code phase synchronization method by using the phase offset |
JP2001021637A (ja) * | 1999-07-07 | 2001-01-26 | Mitsubishi Electric Corp | 位置測定装置および位置測定方法 |
US6466958B1 (en) * | 2000-09-12 | 2002-10-15 | Interstate Electronics Corporation, A Division Of L3 Communications Corporation | Parallel frequency searching in an acquisition correlator |
US7206298B2 (en) * | 2001-09-06 | 2007-04-17 | Qualcomm, Incorporated | Conducting searches amidst asynchronous cells of a communication system |
US8243634B2 (en) * | 2007-03-07 | 2012-08-14 | Telefonaktiebolaget L M Ericsson (Publ) | Random access in time division duplex communication systems |
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2003
- 2003-03-18 CN CNB031191746A patent/CN1275485C/zh not_active Expired - Lifetime
-
2004
- 2004-03-18 WO PCT/CN2004/000218 patent/WO2004084564A1/zh active Application Filing
- 2004-03-18 EP EP04721451.5A patent/EP1605710B1/en not_active Expired - Lifetime
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DE19723090A1 (de) * | 1997-06-02 | 1998-12-03 | Siemens Ag | Verfahren, Mobilstation und Basisstation zum Verbindungsaufbau in einem Funk-Kommunikationssystem |
KR20010060029A (ko) * | 1999-12-31 | 2001-07-06 | 이계철 | 이동통신시스템에서의 물리계층 충돌 감지 장치 |
CN1381107A (zh) * | 2000-06-02 | 2002-11-20 | 三星电子株式会社 | 码分多址移动通信系统中选择随机访问信道的方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN1533199A (zh) | 2004-09-29 |
CN1275485C (zh) | 2006-09-13 |
EP1605710A1 (en) | 2005-12-14 |
EP1605710A4 (en) | 2010-01-13 |
EP1605710B1 (en) | 2017-02-22 |
US7554955B2 (en) | 2009-06-30 |
US20060050775A1 (en) | 2006-03-09 |
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