公开(公告)号：US07746802B2

公开(公告)日：2010-06-29

申请号：US11140878

申请日：2005-05-31

Applicant: Chang-Ho Suh ,  Seok-Hyun Yoon ,  Dong-Seek Park ,  Young-Kwon Cho ,  Dipankar Raychaudhuri ,  Leonid Razoumov

Inventor： Chang-Ho Suh ,  Seok-Hyun Yoon ,  Dong-Seek Park ,  Young-Kwon Cho ,  Dipankar Raychaudhuri ,  Leonid Razoumov

IPC: H04L12/28 ,  G01R31/08 ,  H04W4/00 ,  H04B17/02 ,  H03C1/62

CPC classification number: H04L1/0026 ,  H04L1/0045 ,  H04L1/0073 ,  H04L25/0224 ,  H04L27/2601

Abstract: Disclosed are the design and implementation of a CSI feedback channel in a multi-carrier wireless communication system. An apparatus and a method for channel state feedback using arithmetic coding are provided to ensure efficiency and reliability of a system by transmitting the CSI while compressing the CSI with a predetermined compression rate selected depending on a channel state. The apparatus for CSI feedback in a wireless communication system performing channel estimation at a transmitter or a receiver by using a communication channel includes a transmitter terminal transmitting a signal for CSI measurement by using the communication channel, and a receiver terminal receiving the signal from the transmitter terminal, checking a channel state based on the received signal, and transmitting the signal to the transmitter terminal after compressing the signal according to the channel state.

Abstract translation: 公开了多载波无线通信系统中的CSI反馈信道的设计和实现。 提供了使用算术编码的信道状态反馈的装置和方法，以通过在按照信道状态选择的预定压缩率压缩CSI的同时发送CSI来确保系统的效率和可靠性。 在通过使用通信信道在发射机或接收机处执行信道估计的无线通信系统中的CSI反馈装置包括通过使用通信信道发送用于CSI测量的信号的发射机终端，以及从发射机接收信号的接收机终端 终端，根据接收到的信号检查信道状态，并根据信道状态对信号进行压缩后将信号发送到发送终端。

公开(公告)号：US5675384A

公开(公告)日：1997-10-07

申请号：US538672

申请日：1995-10-03

Applicant: Gopalakrishnan Ramamurthy ,  Dipankar Raychaudhuri ,  Daniel Jorge Reininger

Inventor： Gopalakrishnan Ramamurthy ,  Dipankar Raychaudhuri ,  Daniel Jorge Reininger

IPC: H04N5/92 ,  G06T9/00 ,  H03M7/30 ,  H04L12/801 ,  H04L12/911 ,  H04L12/951 ,  H04N7/10 ,  H04N7/60 ,  H04N19/00 ,  H04N19/60 ,  H04N21/2343 ,  H04N21/236 ,  H04N21/2385 ,  H04N21/434 ,  H04Q3/00 ,  H04N7/26

CPC classification number: H04N21/236 ,  H04L12/5602 ,  H04N19/115 ,  H04N19/126 ,  H04N19/147 ,  H04N19/152 ,  H04N19/184 ,  H04N19/192 ,  H04N19/61 ,  H04N21/434 ,  H04L2012/5616 ,  H04L2012/5632 ,  H04L2012/5636 ,  H04N19/146

Abstract: A system for variable bit-rate video coding in which encoding bandwidth as characterized by a usage parameter control (UPC) parameters is renegotiated between a video encoder and an asynchronous transfer mode network in order to maintain quality-of-service and save bandwidth. The coding system includes adjusting the video source quantization in a manner for controlling the occupancy level of a buffer while new UPC parameters are requested from an ATM network.

Abstract translation: 一种用于可变比特率视频编码的系统，其中在视频编码器和异步传输模式网络之间重新协商使用参数控制（UPC）参数表征的编码带宽，以便保持服务质量和节省带宽。 编码系统包括以从ATM网络请求新的UPC参数的方式调整视频源量化，以便控制缓冲器的占用等级。

公开(公告)号：US4774707A

公开(公告)日：1988-09-27

申请号：US905506

申请日：1986-09-10

Applicant: Dipankar Raychaudhuri

Inventor： Dipankar Raychaudhuri

IPC: H04B7/185 ,  H04L12/56 ,  H04J6/02

CPC classification number: H04B7/18528 ,  H04W28/26 ,  H04W74/02

Abstract: In a communication system serving a plurality of transmitter-receivers, high capacity is achieved by asynchronous contention access of relatively short reservation request packets, which if successfully transmitted result in the scheduled, noncontention transmission of relatively long message data packets. In a first embodiment, the reservation request packets bear information relating to the duration of the message data packets, so that appropriate message data transmission time may be scheduled. Unsuccessful or colliding reservation request packets are retransmitted. In a second embodiment, the reservation requests packets do not include duration information, and the message data packets have fixed duration. In the second embodiment, collision resolution techniques allow the message data scheduling without retransmission of some colliding reservation request packets. It is also possible to operate in both modes, by scheduling random length message data transmissions as a result of noncolliding reservation request packets, and by scheduling fixed duration message data transmissions when reservation request packets collide.

Abstract translation: 在服务于多个发射机 - 接收机的通信系统中，通过相对短的预留请求分组的异步竞争接入来实现高容量，如果成功发送，则导致相对较长的消息数据分组的调度的非接收传输。 在第一实施例中，预留请求分组承载与消息数据分组的持续时间有关的信息，从而可以调度适当的消息数据传输时间。 重新发送不成功或冲突的预留请求数据包。 在第二实施例中，预约请求分组不包括持续时间信息，并且消息数据分组具有固定的持续时间。 在第二实施例中，冲突解决技术允许消息数据调度而不重发一些冲突预留请求分组。 还可以通过调度作为非聚合预留请求分组的结果的随机长度消息数据传输以及当预约请求分组冲突时调度固定持续时间消息数据传输来在两种模式下操作。

公开(公告)号：US06023461A

公开(公告)日：2000-02-08

申请号：US948612

申请日：1997-10-10

Applicant: Dipankar Raychaudhuri ,  Jun Li ,  Arup Acharya

Inventor： Dipankar Raychaudhuri ,  Jun Li ,  Arup Acharya

IPC: H04L12/28 ,  H04L12/56 ,  H04Q11/04 ,  H04W36/12 ,  H04W40/00 ,  H04W40/36 ,  H04Q7/00

CPC classification number: H04W40/00 ,  H04L12/5601 ,  H04Q11/0478 ,  H04L2012/5607 ,  H04L2012/5619 ,  H04L2012/562 ,  H04L2012/5625 ,  H04L2012/563 ,  H04L2012/5679 ,  H04W36/12 ,  H04W40/36

Abstract: A handoff control process in a wireless ATM network replaces an old communications connection with a new communication connection. In order to guarantee that no data is lost during the replacement process, an ATM cell level mechanism is used to re-schedule the buffering and transmitting of data streams of the virtual channels (VCs) to be handed-off. In addition, this mechanism is transparent to user applications. The present invention performs three fundamental cell level scheduling functions. The first function is to mark and redirect cell transmission with operation and maintenance (OAM) cells. The second function is to disable and buffer cell transmission until the new path is connected. The third function is to enable cell transmission, starting with the buffered cells across the connected new path.

Abstract translation: 无线ATM网络中的切换控制过程用新的通信连接代替旧的通信连接。 为了保证在替换过程中没有数据丢失，使用ATM信元级机制来重新调度要切换的虚拟信道（VC）的数据流的缓冲和发送。 此外，这种机制对用户应用程序是透明的。 本发明执行三个基本小区级调度功能。 第一个功能是使用操作和维护（OAM）单元来标记和重定向单元传输。 第二个功能是禁用和缓冲单元传输，直到连接新的路径。 第三个功能是启用单元传输，从连接的新路径上的缓冲单元开始。

公开(公告)号：US5684791A

公开(公告)日：1997-11-04

申请号：US553168

申请日：1995-11-07

Applicant: Dipankar Raychaudhuri ,  Hai Xie ,  Ruixi Yuan

Inventor： Dipankar Raychaudhuri ,  Hai Xie ,  Ruixi Yuan

IPC: H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L12/56 ,  H04Q11/04 ,  H04B7/212

CPC classification number: H04L1/1838 ,  H04L1/0085 ,  H04L1/1614 ,  H04L1/1809 ,  H04L1/1874 ,  H04L1/1887 ,  H04Q11/0478 ,  H04L1/188 ,  H04L2012/5607 ,  H04L2012/5615 ,  H04L2012/5616 ,  H04L2012/5647

Abstract: A data link control procedure for wireless ATM access channels based on a dynamic TDMA/TDD framework provides integrated ATM services including available bit-rate (ABR) data and constant/variable bit-rate (CBR/VBR) voice or video through the addition of wireless-specific medium access control and data link control protocol layers between the physical and ATM network layers. Generally, a data link control is used to insulate the ATM network layer from wireless channel impairments by selective retransmission of erroneous or lost cells before they are released to the ATM layer. The data link control methods disclosed use the on-demand ABR burst transmission capability of the dynamic TDMA channel to retransmit unacknowledged cells in available slots not allocated to service data. Specific error recovery procedures for both (asynchronous) ABR and (isochronous) CBR services are provided.

Abstract translation: 基于动态TDMA / TDD框架的无线ATM接入信道的数据链路控制程序提供综合ATM服务，包括可用的比特率（ABR）数据和恒定/可变比特率（CBR / VBR）语音或视频，通过添加 物理和ATM网络层之间的无线特定媒体访问控制和数据链路控制协议层。 通常，数据链路控制用于通过在将错误或丢失的小区释放到ATM层之前选择性地重传错误或丢失的小区来将ATM网络层与无线信道损伤隔离。 所公开的数据链路控制方法使用动态TDMA信道的按需ABR突发传输能力在未分配给服务数据的可用时隙中重传未确认小区。 提供了（异步）ABR和（同步）CBR服务的特定错误恢复过程。

公开(公告)号：US5638371A

公开(公告)日：1997-06-10

申请号：US495164

申请日：1995-06-27

Applicant: Dipankar Raychaudhuri ,  Hai Xie ,  Ruixi Yuan

Inventor： Dipankar Raychaudhuri ,  Hai Xie ,  Ruixi Yuan

IPC: H04J3/00 ,  H04L1/16 ,  H04L1/18 ,  H04L12/28 ,  H04L12/56 ,  H04Q11/04 ,  H04W12/10 ,  H04W72/12 ,  H04J3/16

CPC classification number: H04W72/1252 ,  H04L1/1854 ,  H04Q11/0478 ,  H04L1/16 ,  H04L2012/5607 ,  H04L2012/5616 ,  H04L2012/563 ,  H04L2012/5632 ,  H04L2012/564 ,  H04L2012/5645 ,  H04L2012/5652 ,  H04W12/10

Abstract: A medium access control (MAC) layer protocol is used in a wireless ATM system for integrated support of ATM services, including constant bit-rate (CBR), variable bit-rate (VBR) and available bit-rate (ABR) services. The MAC protocol supports both connectionless packet and connection-oriented virtual circuit modes, with appropriate service parameter and quality-of-services selection. A dynamic time division, multiple access/time division multiplex (TDMA/TDM) approach accommodates the service classes in an integrated manner. A supervisory MAC procedure integrates ATM ABR/VBR/CBR virtual circuits, providing burst-by-burst allocation of ABR cells and call-by-call allocation of VBR and CBR bandwidth parameters. A mechanism is provided for the dynamic allocation of subframe capacities, assignment of ABR slots based on desired queueing rules, assignment of VBR slots based on ATM traffic shaper parameters and assignment of CBR slots based on bandwidth requirements.

Abstract translation: 在无线ATM系统中使用媒体接入控制（MAC）层协议来综合支持ATM业务，包括恒定比特率（CBR），可变比特率（VBR）和可用比特率（ABR）业务。 MAC协议支持无连接分组和面向连接的虚拟电路模式，具有适当的服务参数和服务质量选择。 动态时分，多址/时分复用（TDMA / TDM）方式以集成方式适应服务类。 监控MAC过程集成ATM ABR / VBR / CBR虚拟电路，提供ABR单元的突发分配和VBR和CBR带宽参数的逐个呼叫分配。 提供了用于子帧容量的动态分配的机制，基于期望的排队规则分配ABR时隙，基于ATM流量整形器参数分配VBR时隙，并且基于带宽需求分配CBR时隙。

公开(公告)号：US4641304A

公开(公告)日：1987-02-03

申请号：US873446

申请日：1986-06-06

Applicant: Dipankar Raychaudhuri

Inventor： Dipankar Raychaudhuri

IPC: H04B7/185 ,  H04L12/56 ,  H04J3/02 ,  H04J3/16 ,  H04J3/24

CPC classification number: H04B7/18528 ,  H04W74/08 ,  H04W84/06

Abstract: A transmission system employing a satellite and a plurality of ground stations each capable of transmitting and receiving data packets to and from each other via the satellite. The satellite station comprises first logic for dividing absolute time into time frames and time frames into message (time) slots with each message slot having a small percentage thereof divided into mini-slots and with each mini-slot in each message slot corresponding to a particular message slot in a future time frame, and second logic including a random number selector responsive to the selection of message slots in the same current time frame by two or more data packets, and third logic for randomly selecting mini-slot for each message slot in which a data packet is to be transmitted in the current time frame with the selected mini-slot for each message slot in the current time frame defining the particular message slot in the future time frame in which the data packet is to be transmitted in case two stations select the same message slot in the current time frame to cause a conflict. A future frame is a time frame which occurs after the data packet in the current time frame has propagated from its originating ground station to the satellite and then back to the originating ground station.

Abstract translation: 一种使用卫星和多个地面站的传输系统，每个地面站能够经由卫星彼此发送和接收数据分组。 卫星站包括用于将绝对时间划分为时间帧和时间帧到消息（时间）时隙的第一逻辑，其中每个消息时隙具有被分成小时隙的小百分比，并且每个消息时隙中的每个小时隙对应于特定的时隙 消息时隙，第二逻辑包括响应于通过两个或多个数据分组在相同当前时间帧中选择消息时隙的随机数选择器，以及用于随机选择每个消息时隙的小时隙的第三逻辑， 在当前时间帧中将在当前时间帧中针对每个消息时隙的所选择的小时隙发送数据分组，该当前时间帧中的定义特定消息时隙的数据分组将在其中在第二情况下传送数据分组的将来时间帧 站点在当前时间范围内选择相同的消息时隙引起冲突。 未来的帧是在当前时间帧中的数据分组从其起始地面站传播到卫星，然后返回到起始地面站之后发生的时间帧。

公开(公告)号：US07293109B2

公开(公告)日：2007-11-06

申请号：US10271502

申请日：2002-10-15

Applicant: Maximilian Ott ,  Daniel J. Reininger ,  Leslie French ,  Dipankar Raychaudhuri

Inventor： Maximilian Ott ,  Daniel J. Reininger ,  Leslie French ,  Dipankar Raychaudhuri

IPC: G06F15/16 ,  G06F15/173

CPC classification number: H04W40/02 ,  H04L12/18 ,  H04L12/1859 ,  H04L12/1881 ,  H04L12/189 ,  H04L29/06 ,  H04L45/306 ,  H04L45/308 ,  H04L67/02 ,  H04L67/04 ,  H04L67/16 ,  H04L67/18 ,  H04L67/306 ,  H04L67/327 ,  H04L69/329 ,  H04W40/12 ,  H04W40/20 ,  H04W40/30 ,  H04W40/36

Abstract: The present invention changes the wireless information service paradigm from a connection-oriented unicast network model to a dynamic content-driven multicast model using a technique called “content routing.” The present invention provides a system, method, and medium for routing content through a network from at least one content provider to at least one content consumer, wherein at least one of the content consumer or content provider communicate with the network using a wireless device. The content is routed though the network based on its content. The content is labeled with at least one content descriptor. The content descriptor characterizes or otherwise describes the content. Interest profiles are received from content consumers. Interest profiles from content consumers with a common network access point are aggregated into a single interest profile. Interest profiles can include more than the wireless consumers stated interest, such as for example, a content consumer's geographic location, the capabilities of the wireless terminal, type of service, policy preferences, and the like. Single interest profiles are shared across neighboring network access points to create a content routing table. Content, labeled with at least one descriptor, is routed through the network to content consumers based, in part, on content routing tables created from wireless content consumers'profiles.

Abstract translation: 本发明使用称为“内容路由”的技术将无线信息服务范例从面向连接的单播网络模型改变为动态内容驱动的多播模型。 本发明提供了一种用于通过网络将内容从至少一个内容提供商路由到至少一个内容消费者的系统，方法和介质，其中内容消费者或内容提供者中的至少一个使用无线设备与网络通信。 内容根据其内容通过网络进行路由。 内容用至少一个内容描述符标记。 内容描述符描述或描述内容。 从内容消费者收到兴趣个人资料。 来自具有公共网络接入点的内容消费者的兴趣简档被聚合成单个兴趣简档。 兴趣简档可以包括超过无线消费者所表达的兴趣，例如内容消费者的地理位置，无线终端的能力，服务类型，策略偏好等。 单个兴趣简档在相邻网络接入点之间共享以创建内容路由表。 标有至少一个描述符的内容部分地基于从无线内容消费者的配置文件创建的内容路由表，通过网络路由到内容消费者。

公开(公告)号：US5974036A

公开(公告)日：1999-10-26

申请号：US773738

申请日：1996-12-24

Applicant: Arup Acharya ,  Jun Li ,  Dipankar Raychaudhuri ,  Ruixi Yuan ,  Subir K. Biswas

Inventor： Arup Acharya ,  Jun Li ,  Dipankar Raychaudhuri ,  Ruixi Yuan ,  Subir K. Biswas

IPC: H04Q3/00 ,  H04L12/28 ,  H04L12/56 ,  H04Q11/04 ,  H04W36/08 ,  H04W36/12 ,  H04W76/04 ,  H04Q7/00

CPC classification number: H04W36/0055 ,  H04L12/5601 ,  H04Q11/0478 ,  H04L2012/5607 ,  H04L2012/5619 ,  H04L2012/562 ,  H04L2012/5625 ,  H04L2012/563 ,  H04L2012/5679 ,  H04W76/04

Abstract: Mobility in a wireless ATM network is accomplished by use of hand-off control protocols. A mobile terminal signals a first base station that a hand-off is to occur. In a first preferred embodiment the first base station signals a second base station requesting a hand-off. After the second base station signals the first base station that a datapath link is available from a hand-off switch to the second base station, the hand-off switch causes the datapath to change from the first base station to the second base station and the first base station signals the mobile terminal to commence communication with the second base station. In a second preferred embodiment, the mobile terminal signals a first base station that a hand-off is to occur. The first base station signals a second base station requesting a hand-off. At the same time a datapath link is established between the first and second base stations. When the second base station signals the first base station that the datapath link is available, the first base station signals the mobile terminal to change to the second base station and data is sent from the first base station to the second base station via the available established datapath link.

Abstract translation: 通过使用切换控制协议来实现无线ATM网络中的移动性。 移动终端向第一基站发信号通知发生越区切换。 在第一优选实施例中，第一基站发信号通知请求切换的第二基站。 在第二基站向第一基站发送数据路由链路从切换交换机向第二基站发送信号之后，切换交换机使数据路径从第一基站改变到第二基站，并且 第一基站向移动终端发信号以开始与第二基站的通信。 在第二优选实施例中，移动终端向第一基站发信号通知发生越区切换。 第一基站发信号通知请求切换的第二基站。 同时在第一和第二基站之间建立数据路径链路。 当第二基站向第一基站通知数据路径链路可用时，第一基站向移动终端发信号通知可转换到第二基站，并且经由可用的建立的数据从第一基站向第二基站发送数据 数据路径链接。

公开(公告)号：US4688213A

公开(公告)日：1987-08-18

申请号：US802999

申请日：1985-11-29

Applicant: Dipankar Raychaudhuri

Inventor： Dipankar Raychaudhuri

IPC: H04B7/185 ,  H04L12/56 ,  H04J3/24

CPC classification number: H04B7/18528 ,  H04W74/02 ,  H04W74/0841

Abstract: An asynchronous random access system includes stations which in one embodiment transmit information as packets at random times. After a path delay, all stations receive the packets. By comparing the period of activity at the station with the known packet length, all stations know when a collision occurs. According to the system protocol, all station inhibit new transmissions for a predetermined time which includes a retransmission time. Stations whose packets were involved in the collision know that their transmission was unsuccessful, and they can also determine whether their own packets were first or last in the collision, based upon the known path delay. Retransmission of the first and last packets occurs during the retransmission interval and is guaranteed to be successful, because all other stations are inhibited. In another embodiment, evaluation of the received data is also performed to establish which packets are second and/or penultimate in collision, and they are also retransmitted according to a prescribed schedule.

Abstract translation: 异步随机访问系统包括在一个实施例中以随机时间作为分组传送信息的站。 路径延迟后，所有站都接收到数据包。 通过比较车站的活动时间与已知包长度，所有车站知道碰撞发生时。 根据系统协议，全站禁止包括重传时间的预定时间的新传输。 分组涉及冲突的站知道它们的传输不成功，并且还可以基于已知的路径延迟来确定它们自己的分组是否在冲突中是第一还是最后。 第一个和最后一个数据包的重传发生在重传间隔期间，并且保证成功，因为所有其他站都被禁止。 在另一个实施例中，还执行接收数据的评估，以确定哪些分组在冲突中是第二和/或倒数第二个，并且它们也根据规定的时间表重传。