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11. 发明专利

JP2006262212A Radio communication system and radio communication apparatus 有权
标题翻译：无线电通信系统和无线电通信设备
公开(公告)号：JP2006262212A
公开(公告)日：2006-09-28
申请号：JP2005078238
申请日：2005-03-17
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI
IPC分类号： H04B7/26
CPC分类号： Y02B60/50
摘要： PROBLEM TO BE SOLVED: To reduce the transmission power of a transmitting station (radio terminal), by transmitting with a minimum transmission power which can offer a radio reception power required for a receiving station. SOLUTION: A receiving station informs a transmission power Tx used for transmission from the receiving station to a transmitting station and a desired reception power rxmin determined from a received background noise power to the transmitting station. On the other hand, the transmitting station (radio terminal) adds an attenuation amount L on a transmission path derived from difference between the informed transmission power Tx and the radio received power Rx to the informed desired received power rxmin to determine a transmission power tx. The transmitting station (radio terminal) transmits radio signals to the receiving station using the transmission power tx. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过以能够提供接收站所需的无线电接收功率的最小发送功率进行发送来降低发送站（无线终端）的发送功率。解决方案：接收站通知用于从接收站到发送站的发送的发送功率Tx，以及从接收到的背景噪声功率确定到发送站的期望接收功率rxmin。另一方面，发送站（无线终端）将从通知发送功率Tx和无线接收功率Rx之间的差导出的传输路径上的衰减量L添加到所需通知的接收功率rxmin，以确定发送功率tx。发送站（无线终端）使用发送功率tx向接收站发送无线信号。版权所有（C）2006，JPO＆NCIPI

12. 发明专利

JP2004274147A Sound field fixed multi-point talking system 审中-公开
公开(公告)号：JP2004274147A
公开(公告)日：2004-09-30
申请号：JP2003058648
申请日：2003-03-05
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI , ENDO SATOSHI , TAKAHASHI YUKIO , ODAKA TORU
IPC分类号： H04S1/00 , H04M3/56
摘要： PROBLEM TO BE SOLVED: To provide a sound field fixed multi-point talking system which artificially locates talking persons' positions in such a space as meeting rooms to provide such an illusional environment that they are talking around a round table and recognize with each other to give them much presence there, whereas they locate in remote places from each other, and improve the serviceability. SOLUTION: The system is composed of a telephone network NW such as portable networks and IP (Internet Protocol) networks, voice talking terminals 2a-2e connected to the telephone network NW, each composed of a portable telephone, etc. having a stereo headset 3a-3e with a microphone, and voice composer 4 connected to the telephone network NW comprising a sound composing means 10 and a stereo sound generating means 9 composed of a sound server, etc. installed in a service center. COPYRIGHT: (C)2004,JPO&NCIPI

13. 发明专利

JP2008136018A Radio terminal, access point, radio communication system provided therewith, and radio communication method 有权
标题翻译：无线电终端，接入点，无线电通信系统及无线电通信方法
公开(公告)号：JP2008136018A
公开(公告)日：2008-06-12
申请号：JP2006321086
申请日：2006-11-29
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI
IPC分类号： H04L12/28 , H04W74/08
CPC分类号： H04W74/0875
摘要： PROBLEM TO BE SOLVED: To provide a communication system by a radio LAN which increases a transmission efficiency. SOLUTION: A radio terminal 10A transmits an ACK signal when it receives a Data 1 signal from an access point 20 normally (TA12). When data to be transmitted exist, the radio terminal 10A transmits a Data 2 signal (TA14) to the access point 20 after a SIFS period (TA13). On the other hand, the access point 20 and other radio terminal 10B wait for a period (DIFS + random number) (A12 and TB11) according to the IEEE 802.11 Standard when they receive the ACK signal from the radio terminal 10A (A11 and TB10). The radio terminal 10A transmits the Data 2 signal preferentially without interfering with other apparatus therefore. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种提高传输效率的无线LAN的通信系统。解决方案：无线电终端10A从接入点20正常接收到数据1信号（TA12）时发送ACK信号。当要发送的数据存在时，无线终端10A在SIFS周期（TA13）之后向接入点20发送数据2信号（TA14）。另一方面，当接收点20和其他无线终端10B从无线终端10A（A11和TB10）接收到ACK信号时，根据IEEE 802.11标准等待一段时间（DIFS +随机数）（A12和TB11））。无线电终端10A优先地发送数据2信号而不干扰其他装置。版权所有（C）2008，JPO＆INPIT

14. 发明专利

JP2007158765A Radio communication terminal and method for distributing load of repeater thereof 有权
标题翻译：无线电通信终端及其分配负载的方法
公开(公告)号：JP2007158765A
公开(公告)日：2007-06-21
申请号：JP2005351826
申请日：2005-12-06
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI , SUZUKI TSUTOMU
IPC分类号： H04L12/28 , H04W36/22 , H04W48/16
摘要： PROBLEM TO BE SOLVED: To suppress an increase in facility cost without having the need of specially changing APs (access point) because data for determining the necessity of connection change is obtained from a beacon signal stipulated in IEEE802. 11. SOLUTION: A terminal of a radio LAN receives a beacon signal stipulated in IEEE802. 11 from the currently connected AP (S12), analyzes the beacon signal, finds the number N1 of terminals having data to be transmitted from the AP (S13), receives a beacon signal stipulated in IEEE802. 11 from another adjacent AP (S17) when the number N1 of terminals is greater than a predetermined number TH1, finds the number N2 of terminals having data to be transmitted from the other adjacent AP (S19), determines whether the other AP can be a handover candidate by using N1 and N2 (S20 and 21) AND, and performs a handover to the other AP when the AP can be a handover candidate (S24). COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了抑制设备成本的增加而不需要特别改变AP（接入点），因为用于确定连接改变的必要性的数据是从IEEE802规定的信标信号中获得的。 11.解决方案：无线电LAN的终端接收IEEE802中规定的信标信号。 11（S12），分析信标信号，找出具有从AP发送数据的终端的数量N1（S13），接收IEEE802规定的信标信号。 11，当终端的数量N1大于预定数量TH1时，从另一相邻的AP（S17）发现具有要从其他相邻AP发送的数据的终端的数量N2（S19），确定其他AP是否可以是通过使用N1和N2进行切换候选（S20和21）AND，并且当AP可以是切换候选时，执行到另一个AP的切换（S24）。版权所有（C）2007，JPO＆INPIT

15. 发明专利

JP2007081671A Access point, communication system and transmission control method 有权
标题翻译：接入点，通信系统和传输控制方法
公开(公告)号：JP2007081671A
公开(公告)日：2007-03-29
申请号：JP2005265429
申请日：2005-09-13
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI
IPC分类号： H04L12/28 , H04B7/26 , H04W72/04 , H04W72/08
摘要： PROBLEM TO BE SOLVED: To prevent a wireless signal transmitted from an access point to a wireless terminal from interfering with a wireless signal transmitted from other wireless terminal to other access point.
SOLUTION: By receiving a sync signal transmitted from a notification unit 140, an access point 110 transmits a wireless signal to a wireless terminal 120, and receives a wireless signal from the wireless terminal 120 upon completing transmission of a wireless signal to the wireless terminal 120 at all access points 110 connected with a wired LAN 130.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：防止从无线终端的接入点发送的无线信号干扰从其他无线终端发送到其他接入点的无线信号。解决方案：通过接收从通知单元140发送的同步信号，接入点110向无线终端120发送无线信号，并且在完成向无线终端120发送无线信号时从无线终端120接收无线信号无线终端120在与有线LAN 130连接的所有接入点110处。版权所有（C）2007，JPO＆INPIT

16. 发明专利

JP2007081528A Transmission error improvement system in wireless lan and access point and wireless lan terminal 有权
标题翻译：无线局域网和接入点无线LAN终端传输错误改进系统
公开(公告)号：JP2007081528A
公开(公告)日：2007-03-29
申请号：JP2005263622
申请日：2005-09-12
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI
IPC分类号： H04L12/28 , H04L29/08 , H04W28/04 , H04W28/10
摘要： PROBLEM TO BE SOLVED: To increase the number of wireless LAN terminals capable of talking over the telephone simultaneously while reducing the impact of transmission error in wireless LAN.
SOLUTION: Wireless transmission rate for transmitting/receiving a voice signal by radio is calculated (S3), transmission error is reduced by resending a voice signal to each wireless terminal (S4) when the wireless transmission rate is low, otherwise data is transmitted/received without resending the voice signal (S7) thus increasing the number of wireless LAN terminals capable of communicating simultaneously.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：通过电话同时增加能够通话的无线局域网终端的数量，同时减少无线局域网中传输错误的影响。解决方案：计算通过无线电发送/接收语音信号的无线传输速率（S3），当无线传输速率低时，通过向每个无线终端重发语音信号（S4）来减少传输错误，否则数据是发送/接收而不重新发送语音信号（S7），从而增加能够同时通信的无线LAN终端的数量。版权所有（C）2007，JPO＆INPIT

17. 发明专利

JP2007081527A Wireless lan terminal for three points voice meeting and its address display method 有权
标题翻译：无线局域网终端用于三点语音会议及其地址显示方法
公开(公告)号：JP2007081527A
公开(公告)日：2007-03-29
申请号：JP2005263621
申请日：2005-09-12
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI
IPC分类号： H04L12/46 , H04M3/56
摘要： PROBLEM TO BE SOLVED: To facilitate connection operation when three person communication is performed using a communication terminal of different address system having at least two communication interfaces. SOLUTION: In a public/IP common telephone 1 comprising a wireless section 1C with public wireless line, an IP wireless section 1B with wireless LAN, and an information communication terminal section 1A communicating with different partners simultaneously using both wireless sections, the information communication terminal section 1A comprises a circuit 1A05 for sending one's own voice and the voice of one partner to other partner while compounding and outputting the voices of both partners as a voice while compounding, a section 1A04 for displaying the address of the partner's terminal, a table 1A07 describing the line use situation of the partner's terminal, and a line use situation table management section 1A09 for managing the address of a connectable partner's terminal on the table 1A07, the address of a unconnectable partner's terminal, and the address of a partner's terminal under communication separately. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了便于使用具有至少两个通信接口的不同地址系统的通信终端执行三人通信时的连接操作。解决方案：在具有公共无线线路的无线部分1C的公共/ IP公用电话机1中，具有无线LAN的IP无线部分1B和与两个无线部分同时与不同伙伴通信的信息通信终端部分1A，信息通信终端部分1A包括一个电路1A05，用于在混合时复合并输出两个伙伴的声音作为一个声音发送自己的声音和一个伙伴的声音到另一个对方，用于显示对方终端的地址的部分1A04，描述合作伙伴终端的线路使用情况的表1A07，以及用于管理表1A07上的可连接对方终端的地址，不可连接的对方终端的地址以及对方的终端的地址的线路使用状况表管理部分1A09 终端分别通信。版权所有（C）2007，JPO＆INPIT

18. 发明专利

JP2005123981A Image signal receiver and its image-coded signal composing method 审中-公开
标题翻译：图像信号接收器及其图像编码信号组合方法
公开(公告)号：JP2005123981A
公开(公告)日：2005-05-12
申请号：JP2003358065
申请日：2003-10-17
申请人： Hitachi Communication Technologies Ltd , Hitachi Hybrid Network Co Ltd , 日立ハイブリッドネットワーク株式会社 , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI , ENOMOTO KAZUHIRO
IPC分类号： H04N7/18 , H04N19/44 , H04N19/50 , H04N19/503 , H04N19/59 , H04N19/593 , H04N7/32
摘要： PROBLEM TO BE SOLVED: To provide a high-convenience image signal receiver which converts I-pictures into P-pictures in image-coded signals, if containing the I-pictures and the P-pictures mixed together, thus unifying the image-coded signals with the P-pictures only, and composes the image-coded signals.
SOLUTION: The receiver is composed of a decoder 3 which receives multimedia multiplexed signals (image-coded signals and sound-coded signals) transmitted from image signal transmitters T1-Tn over a communication network NT, and composes a plurality of image-coded signals of the inter-frame estimation mode and the intra-frame estimation mode in the form of the image-coded signals unified with the inter-frame estimation mode to restore single image signals; an image monitor 4 for displaying a plurality of restored image signals on one screen; and a speaker 5 for outputting restored sound signals with sounds.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了提供将图像编码信号中的I图像转换为P图像的高便利图像信号接收机，如果将I图像和P图像混合在一起，则将图像统一编码信号，并且构成图像编码信号。解决方案：接收机由解码器3组成，解码器3通过通信网络NT接收从图像信号发送器T1-Tn发送的多路复用信号（图像编码信号和声音编码信号），并且构成多个图像 - 以与帧间估计模式统一的图像编码信号的形式的帧间估计模式和帧内估计模式的编码信号，以恢复单个图像信号; 图像监视器4，用于在一个屏幕上显示多个恢复的图像信号; 以及用于输出具有声音的恢复的声音信号的扬声器5。版权所有（C）2005，JPO＆NCIPI

19. 发明专利

JP2004112334A Real time transmission system and real time receiver 有权
公开(公告)号：JP2004112334A
公开(公告)日：2004-04-08
申请号：JP2002272098
申请日：2002-09-18
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： ENDO SATOSHI , TAKIZAWA MASAAKI
IPC分类号： H04L12/707 , H04L12/70 , H04L12/711 , H04L29/08 , H04M3/00 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To provide a real time transmitter in which it is possible to switch to another transmission line such as an ISDN network before a transmission line becomes unfit for transmission of real time signals due to frequent transmission errors, by detecting the tendency of the increase of the transmission errors in a VIP network using an IP. SOLUTION: The real time receiver 3 is connected with a real time transmitter via the IP network 61 and an ISDN line 62, and is provided with an ISDN line communication control means 31 to control connection by establishing the connection of an IP network communication control means 30, a BF 32-1, an IP network synchronization detecting means 33-1, the ISDN line 62, a delay control means 34 to control delay amounts of both BFs on the basis of a BF 32-2, an ISDN line synchronization detecting means 33-2, and the detection results of a synchronization detecting means 33. Further, the receiver has a transmission line abnormality detecting means 36 to detect the increase signs of the transmission errors by measuring a packet loss rate and a jitter of the real time signals via the IP network 61, a switching means 35 to output the real time signals from the IP network 61 or the ISDN network 62 by switching them, and a delay means 37 to adjust the timing for switching the real time signals via the IP network 61 to the ISDN line 62. COPYRIGHT: (C)2004,JPO

20. 发明专利

JP2009027234A Communication controller, sip server, communication system and communication control method 有权
标题翻译：通信控制器，SIP服务器，通信系统和通信控制方法
公开(公告)号：JP2009027234A
公开(公告)日：2009-02-05
申请号：JP2007185458
申请日：2007-07-17
申请人： Hitachi Communication Technologies Ltd , 株式会社日立コミュニケーションテクノロジー
发明人： TAKIZAWA MASAAKI
IPC分类号： H04W28/02 , H04M3/00 , H04M11/00 , H04W84/12
摘要： PROBLEM TO BE SOLVED: To provide a technology for reducing the communication load by a convenient method.
SOLUTION: A communication controller 150 acquires session information specifying the IP address of a wireless terminal 110 under service from an SIP server 130 connected with an LAN 180, acquires attribution information specifying the MAC address of the wireless terminal 110 belonging to an AP 120 connected with the LAN 180 by means of the AP 120, calculates the number of wireless terminals 110 under service out of the wireless terminals 110 belonging to the AP 120 for every AP 120, and limits communication through that AP 120 if the calculated number exceeds a predetermined threshold.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种通过方便的方法减少通信负载的技术。解决方案：通信控制器150从与LAN 180连接的SIP服务器130获取指定正在服务的无线终端110的IP地址的会话信息，获取指定属于AP的无线终端110的MAC地址的属性信息 120通过AP 120与LAN 180连接，计算属于每个AP 120的属于AP 120的无线终端110服务的无线终端110的数量，并且如果计算出的数量超过，则限制通过该AP 120的通信预定阈值。版权所有（C）2009，JPO＆INPIT

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