专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2013090203A Radio communication system, handover control method, and base station 审中-公开
标题翻译：无线电通信系统，切换控制方法和基站
公开(公告)号：JP2013090203A
公开(公告)日：2013-05-13
申请号：JP2011229914
申请日：2011-10-19
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TAMURA HISATAKA , KATAYAMA RINTARO , ISHII HIROTAKE
IPC分类号： H04W36/32 , H04W36/08 , H04W36/38
摘要： PROBLEM TO BE SOLVED: To reduce a network device load which includes a base station by suppressing frequent occurrence of handover in a high-speed moving terminal.SOLUTION: The base station determines a base station for handover according to a residence time of a terminal in an adjacent cell which is to be a handover destination target candidate. As information to determine the handover target base station of the high-speed moving terminal, each base station measures and retains residence time information of a terminal having a moving speed of a constant value or higher. At handing over the high-speed moving terminal, the base station acquires an average residence time of the high-speed moving terminal from an adjacent base station or a log server retaining residence time information collected from each base station, and according to the residence time, offsets the handover reference value of each base station.
摘要翻译：要解决的问题：通过抑制高速移动终端中的频繁发生切换来减少包括基站的网络设备负载。解决方案：基站根据作为切换目的地目标候选的相邻小区中的终端的停留时间来确定用于切换的基站。作为确定高速移动终端的切换目标基站的信息，各基站测量并保持具有一定值以上的移动速度的终端的停留时间信息。在移交高速移动终端时，基站从相邻的基站或从每个基站收集的停留时间信息的日志服务器获取高速移动终端的平均停留时间，并根据停留时间，抵消每个基站的切换参考值。版权所有（C）2013，JPO＆INPIT

2. 发明专利

JP2011182009A Base station, wireless communication system and interference criteria handover control method 有权
标题翻译：基站，无线通信系统和干扰标准切换控制方法
公开(公告)号：JP2011182009A
公开(公告)日：2011-09-15
申请号：JP2010041495
申请日：2010-02-26
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： YAMAMOTO TOMOSHI , TAMAKI SATOSHI , KATAYAMA RINTARO , ISHII HIROTAKE
IPC分类号： H04W36/20 , H04W36/22
CPC分类号： H04W36/20 , H04W36/0083
摘要： PROBLEM TO BE SOLVED: To reduce an interference applied to neighbor cells during terminal handovers in wireless communication systems provided with base stations having different cell radii. SOLUTION: A serving cell makes handover judgment criteria easier based on previously acquired radius information on its own cell and radius information of neighbor cells in order to facilitate terminal handovers from a base station with a large cell radius to a base station with a small cell radius. The serving cell finds evaluation function values based on the propagation state (e.g. reference signal received power) between the terminal and a target cell, and the interference and load information exchanged between the base stations, and selects the terminal for handover by comparing the evaluation function value with the handover criteria value. The handover destination selects a target cell having a good effect in lowering interference such as a cell with large reference signal received power acquired from a terminal. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：为了减少在设置有具有不同小区半径的基站的无线通信系统中在终端切换期间施加到相邻小区的干扰。解决方案：服务小区基于先前获得的关于其自身小区的小区信息和相邻小区的半径信息，使切换判断标准更容易，以便于从具有大小区半径的基站到具有基站的基站的终端切换小细胞半径服务小区基于终端与目标小区之间的传播状态（例如，参考信号接收功率）以及基站之间交换的干扰和负载信息来找到评估函数值，并通过比较评估函数来选择终端进行切换值与切换标准值。切换目的地选择具有从终端获取的具有大的参考信号接收功率的小区等降低干扰效果的目标小区。版权所有（C）2011，JPO＆INPIT

3. 发明专利

JP2010283632A Wireless communication system, base station, and terminal 有权
标题翻译：无线通信系统，基站和终端
公开(公告)号：JP2010283632A
公开(公告)日：2010-12-16
申请号：JP2009135688
申请日：2009-06-05
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KATAYAMA RINTARO , TAMAKI SATOSHI , YAMAMOTO TOMOSHI , ISHII HIROTAKE
IPC分类号： H04W72/04 , H04W28/18 , H04W52/30
CPC分类号： H04L5/003
摘要： PROBLEM TO BE SOLVED: To provide technology to prevent each cell from increasing cell end bands or cell end terminals because the increase gives interference to a peripheral cell, and a lowers throughput in the peripheral cell, in a communication system which assigns resources to center terminals in the cell center bands while assigning the resources to the cell end terminals in the cell end bands.
SOLUTION: The quantity of cell end bands is limited. The upper limit of the quantity of cell end bands in each cell is then set for limiting the quantity of cell end band based on the upper limit. The number of cell end terminals is also limited. Further, the upper limit of the number of cell end terminals is set for limiting the number of cell end terminals based on the upper limit.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供技术以防止每个小区增加小区终端频带或小区终端，因为在分配资源的通信系统中，增加对外围小区造成干扰并降低周边小区的吞吐量将小区中心频带中的终端中心，同时将资源分配给小区端带中的小区终端。
解决方案：单元格端段的数量有限。然后设置每个小区中的小区终端频带的数量的上限，以便限制基于上限的小区终端频带的数量。单元终端的数量也受到限制。此外，单元终端的数量的上限被设定为基于上限来限制单元终端的数量。版权所有（C）2011，JPO＆INPIT

4. 发明专利

JP2002325044A POWER AMPLIFIER 失效
公开(公告)号：JP2002325044A
公开(公告)日：2002-11-08
申请号：JP2001128608
申请日：2001-04-26
申请人： HITACHI LTD
发明人： KISHIDA HIROSHI , ISHII HIROTAKE
IPC分类号： H04B1/04
摘要： PROBLEM TO BE SOLVED: To solve a problem that an amplifier exhibiting a high efficiency constantly can not be provided because it is susceptible to temperature variation or aging when the magnitude of output power is detected by means of an analog detector and a control signal is generated. SOLUTION: Absolute values of a plurality of sets of I, Q baseband signal are compared individually by means of a plurality of comparators and the comparison results are determined in a majority processing section. A bias control section performs on/off control of the bias for each of a plurality of amplifiers connected in parallel in a common amplifier. An amplifier to be operated is then selected and operated with high efficiency.

5. 发明专利

JPH10107687A SYNCHRONIZATION FOLLOWING CIRCUIT IN SPREAD SPECTRUM COMMUNICATION AND RADIO COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH10107687A
公开(公告)日：1998-04-24
申请号：JP26038296
申请日：1996-10-01
申请人： HITACHI LTD
发明人： NARUSE MASAO , YANO TAKASHI , ISHII HIROTAKE
IPC分类号： H04B1/707 , H04B1/7085 , H04L7/00 , H04L7/08
摘要： PROBLEM TO BE SOLVED: To simplify the design and to reduce the circuit scale in the synchronization hold circuit in the spread spectrum communication. SOLUTION: A delay device 10 is placed on a path of a reception signal to produce a signal a signal to be sent to a demodulation section 20 and a signal whose phase is shifted from a phase of the signal, and a subtractor 35 is used to generate a difference between the signals whose phases are shifted to each other. A spread code is multiplied (31) with a signal L fed to the demodulation section 20 and with the difference and the product is integrated (32). An integration result H or its code in the demodulation section 20 is multiplied with an integration result P to generate a control signal K to be outputted to an LPF 43. Thus, the synchronization hold circuit is configured with a same performance as a conventional circuit but with a remarkably small circuit scale and the power consumption is reduced.

6. 发明专利

JPH1056406A WAVEFORM EQUALIZING PROCESSING METHOD FOR EQUALIZER 失效
公开(公告)号：JPH1056406A
公开(公告)日：1998-02-24
申请号：JP21082496
申请日：1996-08-09
申请人： HITACHI LTD
发明人： TANAKA JUNKO , SUZUKI HIDEYA , ISHII HIROTAKE , TANIGAWA KOICHI
IPC分类号： H04B3/10 , H04B7/005
摘要： PROBLEM TO BE SOLVED: To reduce an operated variable by estimating a tap coefficient while using a tap gain coefficient provided by using the training sequence of a present slot and a tap gain coefficient provided by the training of an adjacent slot. SOLUTION: At a present slot (#n), training is performed while using the training sequence of this slot. Next, at a following adjacent slot [#(n+1)], training is performed by using its training sequence. Then, the tap gain coefficient at the data part of #n is estimated by performing interpolating processing while using the tap gain coefficients estimated by the training sequences of these #n and #(n+1). In this case, as the training sequence, a synchronizing word to be used for frame synchronism between a base station and a mobile station is used, for example. When the synchronizing word is used, the frame synchronization and the training can be performed through the same sequence. Thus, by estimating the tap coefficient, the operated variable in equalizing processing can be reduced.

7. 发明专利

JPH07141788A METHOD AND DEVICE FOR REPRODUCING DIGITAL SIGNAL 失效
公开(公告)号：JPH07141788A
公开(公告)日：1995-06-02
申请号：JP16896393
申请日：1993-07-08
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , ISHII HIROTAKE , SETOYAMA TORU
IPC分类号： H04N5/781 , G11B20/14 , H04N1/403 , H04N5/205 , H04N5/66 , H04N5/92
摘要： PURPOSE:To realize a recording/reproducing device with the high reliability for a recording code with a minimum run length 3. CONSTITUTION:A signal regenerated from a recording medium 4 is dealt with in two bits, and is equalized by a reproducing equalizer circuit 6 so as to become an output when 11>an reference output>the output when 00 making the output when a recording signal is 10 or 01 the reference output. Then, the output is identified to a ternary by a clamping circuit 7 and an identification operation circuit 8, and the low frequency component of a regenerative signal is compensated by operating an original recording code by the identification result and a record encoding rule. Thus, an identification interval is made two bits, and the device capable of dealing with the high speed recording data is provided.

8. 发明专利

JPH0737337A METHOD AND APPARATUS FOR RECORDING AND REPRODUCTING DIGITAL SIGNAL 失效
公开(公告)号：JPH0737337A
公开(公告)日：1995-02-07
申请号：JP16886493
申请日：1993-07-08
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , ISHII HIROTAKE , KUDO KOJI
IPC分类号： G11B20/14 , H03M7/14 , H04L25/49 , H04L25/497 , H04N5/92 , H04N7/24 , H04N19/00
摘要： PURPOSE:To improve the ratio between Tmax and Tmin substantially by especially reducing the maximum value of a run-length for the recording code of d=2. CONSTITUTION:In an NRZL recording for data bits, a first record coding means 1 performs the record coding, wherein the shortest run-length (in NRZL record coding) (d) has the characteristic of 2, and a second record coding means 2 are provided. The second record coding means 2 divides the signal series at every 2 bits in the signal-waveform series Dn(n indicates each bit) and performs the non-inversion and inversion of the signal in response to the divided signal. After the second record coding, the signal is sent through a record amplifier circuit 3, a tape head system 4, reproducing amplifier circuit 5 and an equalizing means 6. The signal is recorded in a recording medium and or sent into a transmission line. The reproduced signal from the recording medium or the signal received from the transmission line is made to be a specified equalized waveform signal with the compensating characteristic corresponding to the record reproducing system or the transmission characteristic. Furthermore, a means 7, which performs identification in 2-bit unit, and a means 8, which decodes the result of the identification into the original data bits, are provided in this constitution.

9. 发明专利

JPH05314669A DEVICE FOR IDENTIFYING DIGITAL SIGNAL AND METHOD THEREFOR 失效
公开(公告)号：JPH05314669A
公开(公告)日：1993-11-26
申请号：JP11340092
申请日：1992-05-06
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , SAWAMURA HIDEHIKO , ISHII HIROTAKE
IPC分类号： G11B20/14 , H04L25/49
摘要： PURPOSE:To inexpensively constitute an identification circuit for regenerating and receiving a digital signal without using a high speed semiconductor by reducing the clock frequency of the identification circuit. CONSTITUTION:With respect to the output signal of a regenerative signal amplifier 2, by a reproducing and equalizing circuit 3, the unit pulse of a signal transfer interval T is equalized to a prescribed reproducing waveform and reproduction and equalization for compensating the transmission characteristic of a tape head system to a frequency characteristic by which a digital signal is identified easily are executed. Subsequently, by a ternary identification circuit 4, the signal is identified in the period of two folds of a signal transfer interval T and decoded to its original digital modulating signal by an arithmetic circuit 6. In such a manner, an identification clock can be decreased to a half, the circuit configuration can be available without using a high speed semiconductor, the cost can be reduced, and also, the device becomes profitable in a manufacturing process and a design stage.

10. 发明专利

JP2015005872A 基地局装置、無線通信システムおよび方法审中-公开
标题翻译：基站设备，无线电通信系统和方法
公开(公告)号：JP2015005872A
公开(公告)日：2015-01-08
申请号：JP2013129774
申请日：2013-06-20
申请人：株式会社日立製作所 , Hitachi Ltd
发明人： NOGAWA KENICHI , KATAYAMA RINTARO , TAMURA HISATAKA , ISHII HIROTAKE
IPC分类号： H04W36/22 , H04L5/18 , H04W24/10 , H04W28/18
摘要：【課題】移動体通信システムにおいて、各セルの同時接続可能ユーザ数やデータキャパシティは、基地局の処理能力や無線リソースによる制約を受ける。そのため、ある特定のセルにユーザが集中しているとき、多数のユーザが同時にデータ通信を行うと、無線リソースの逼迫が発生し、1ユーザ当りのスループットやユーザQoEが低下する場合に対し、無線リソースの有効活用するためのセル間負荷分散制御を行う。【解決手段】無線基地局装置は、各移動局の接続セルにおける現在の無線リソース使用率、および隣接セルに接続した場合の無線リソース使用率予測値をもとに、無線システム全体での無線リソースの有効利用を図り、ある特定セルでの無線リソースの逼迫状態を解消する様に、各移動局の最適な接続セルを選択し、ハンドオーバを実行する。【選択図】図3
摘要翻译：要解决的问题：为了在用户集中在特定小区的同时进行数据通信的大量用户的情况下，为了有效地使用无线资源，进行小区间负载平衡控制，导致无线资源的短缺，并且每个用户或用户QoE的吞吐量恶化，因为在移动通信系统中，每个小区的同时连接允许用户数量和数据容量受基站的处理能力和无线电资源的约束。解决方案：无线电基站设备选择每个移动台的最佳连接小区，并执行切换，使得其将有效地使用整个无线电系统中的无线电资源，并且基于连接小区中的当前无线电资源利用率来消除特定小区中的无线电资源的短暂状态以及在与广告连接的情况下的无线资源利用率估计值 j acent

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式