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180 条记录 (耗时 0.033 秒)

    Technique for effectively serving information objects through a communication network
    91.
    发明授权
    Technique for effectively serving information objects through a communication network 失效
    通过通信网络有效地提供信息对象的技术

    公开(公告)号：US6138152A

    公开(公告)日：2000-10-24

    申请号：US89596

    申请日：1998-06-02

    申请人： Pankaj Jalote ,  Sampath Rangarajan ,  Shalini Yajnik

    发明人： Pankaj Jalote ,  Sampath Rangarajan ,  Shalini Yajnik

    IPC分类号： G06F17/30 ,  G06F15/16 ,  G06F15/17

    CPC分类号： G06F17/30887 ,  Y10S707/99953 ,  Y10S707/99954

    摘要： In a communication arrangement, client terminals request information objects, e.g., hypertext markup language (HTML) documents, which are identified by their uniform resource locators (URLs) from a server system connected to the World Wide Web (WWW). For example, the information objects may represent different chapters of the same book and are thus logically connected. In accordance with the invention, when the logically connected information objects are updated, the updated versions of the information objects are stored in a temporary memory space. For those client terminals requesting the logically connected information objects by their URLs before the update, the server system consistently provides the original versions of the information objects at such URLs to the client terminals. However, for those client terminals requesting the logically connected information objects by their URLs after the update, the server system translates the given URLs to different URLs indicating the memory locations where the updated versions thereof are stored, thereby consistently providing the updated versions to the client terminals.

    摘要翻译： 在通信方案中，客户端终端从连接到万维网（WWW）的服务器系统请求由其统一资源定位符（URL）标识的信息对象，例如超文本标记语言（HTML）文档。 例如，信息对象可以表示同一本书的不同章节，因此逻辑上是连接的。 根据本发明，当逻辑连接的信息对象被更新时，信息对象的更新版本被存储在临时存储器空间中。 对于那些在更新之前通过其URL请求逻辑连接的信息对象的客户终端，服务器系统始终将这些URL处的信息对象的原始版本提供给客户终端。 然而，对于那些在更新之后通过其URL请求逻辑连接的信息对象的客户终端，服务器系统将给定的URL转换成指示存储其更新版本的存储器位置的不同URL，从而始终向客户端提供更新的版本 终端。

    Data distribution techniques for load-balanced fault-tolerant web access
    92.
    发明授权
    Data distribution techniques for load-balanced fault-tolerant web access 失效
    负载均衡容错Web访问的数据分发技术

    公开(公告)号：US6070191A

    公开(公告)日：2000-05-30

    申请号：US953577

    申请日：1997-10-17

    申请人： Balakrishnan Narendran ,  Sampath Rangarajan ,  Shalini Yajnik

    发明人： Balakrishnan Narendran ,  Sampath Rangarajan ,  Shalini Yajnik

    IPC分类号： G06F9/50 ,  G06F11/00 ,  H04L29/06 ,  H04L29/08 ,  G06F13/00

    CPC分类号： G06F9/505 ,  G06F9/5083 ,  H04L67/1023 ,  H04L67/1095 ,  H04L69/329 ,  H04L67/1002 ,  H04L67/1034

    摘要： A server system for processing client requests received over a communication network includes a cluster of N document servers and at least one redirection server. The redirection server receives a client request from the network and redirects it to one of the document servers, based on a set of pre-computed redirection probabilities. Each of the document servers may be an HTTP server that manages a set of documents locally and can service client requests only for the locally-available documents. A set of documents are distributed across the document servers in accordance with a load distribution algorithm which may utilize the access rates of the documents as a metric for distributing the documents across the servers and determining the redirection probabilities. The load distribution algorithm attempts to equalize the sum of the access rates of all the documents stored at a given document server across all of the document servers. In the event of a server failure, the redirection probabilities may be recomputed such that the load of client requests is approximately balanced among the remaining document servers. The redirection probabilities may also be recomputed periodically in order to take into account changes in document access rates and changes in server capacity. The recomputation may be based on a maximum-flow minimum-cost solution of a network flow problem.

    摘要翻译： 用于处理通过通信网络接收的客户端请求的服务器系统包括N个文档服务器的集群和至少一个重定向服务器。 重定向服务器基于一组预先计算的重定向概率从网络接收客户端请求并将其重定向到其中一个文档服务器。 每个文档服务器可以是本地管理一组文档的HTTP服务器，并且可以仅为本地可用文档服务客户端请求。 一组文档根据负载分布算法分布在文档服务器上，负载分配算法可以利用文档的访问速率作为跨服务器分发文档的度量并确定重定向概率。 负载分配算法尝试均衡所有文档服务器上存储在给定文档服务器上的所有文档的访问速率之和。 在服务器发生故障的情况下，可以重新计算重定向概率，使得客户机请求的负载在剩余的文档服务器之间大致平衡。 也可以定期重新计算重定向概率，以便考虑文档访问速率和服务器容量变化的变化。 重新计算可以基于网络流量问题的最大流量最小成本解决方案。

    Multiple stage hybrid spectrum sensing methods and systems for cognitive radio
    96.
    发明授权
    Multiple stage hybrid spectrum sensing methods and systems for cognitive radio 有权
    用于认知无线电的多级混合频谱感测方法和系统

    公开(公告)号：US08761677B2

    公开(公告)日：2014-06-24

    申请号：US13408175

    申请日：2012-02-29

    申请人： Kyungtae Kim ,  Yan Xin ,  Sampath Rangarajan

    发明人： Kyungtae Kim ,  Yan Xin ,  Sampath Rangarajan

    IPC分类号： H04B15/00 ,  H04B17/00

    CPC分类号： H04W16/14 ,  H04L27/0006 ,  H04W72/1226

    摘要： Systems and methods for detecting unused channels in a cognitive radio system are described. In one method, data is communicated on a particular channel for a secondary receiver. In addition, a set of channels is iteratively scanned by collecting samples for each channel and for each iteration of the scanning. Here, iterations of the scanning progressively removes channels from the set of channels based on the collected samples and updates states of the channels in the set based on the collected samples to obtain a set of candidate channels. In response to detecting a pre-determined condition, communications on the particular channel are precluded and at least one of the candidate channels is evaluated by collecting additional samples on each of the channels. Further, at least one of the candidate channels is selected based on the evaluation for utilization by the one or more secondary receivers for data communication.

    摘要翻译： 描述了用于在认知无线电系统中检测未使用信道的系统和方法。 在一种方法中，数据在用于辅助接收机的特定信道上传送。 此外，通过收集每个通道的样本和扫描的每次迭代，迭代地扫描一组通道。 这里，扫描的迭代基于收集的采样逐渐地从信道集合中去除信道，并且基于收集的样本更新集合中的信道的状态以获得一组候选信道。 响应于检测到预定条件，排除特定信道上的通信，并且通过在每个信道上收集附加样本来评估候选信道中的至少一个。 此外，基于用于数据通信的一个或多个次要接收机的利用的评估来选择至少一个候选信道。

    Multicast scheduling systems and methods for leveraging cooperation gains in relay networks
    98.
    发明授权
    Multicast scheduling systems and methods for leveraging cooperation gains in relay networks 有权
    组播调度系统和方法，用于利用中继网络中的协作增益

    公开(公告)号：US08537693B2

    公开(公告)日：2013-09-17

    申请号：US12906527

    申请日：2010-10-18

    申请人： Karthikeyan Sundaresan ,  Sampath Rangarajan

    发明人： Karthikeyan Sundaresan ,  Sampath Rangarajan

    IPC分类号： G01R31/08

    CPC分类号： H04L12/1881 ,  H04B7/15592 ,  H04L12/189 ,  H04L47/10 ,  H04W72/005 ,  H04W72/082 ,  H04W84/047

    摘要： Methods and systems for transmitting multicast data in a wireless relay network are described. A tradeoff between the benefits of relay cooperation and session multiplexing can be addressed through careful association of relay stations for resource allocation purposes to maximize the total system throughput. In addition, various complex and greedy scheduling procedures that are based on the distributed pet mutation model and the contiguous permutation model are also described.

    摘要翻译： 描述了在无线中继网络中传输组播数据的方法和系统。 中继协议和会话多路复用的优点之间的折衷可以通过中继站的仔细关联来解决，用于资源分配目的，以最大限度地提高总系统吞吐量。 此外，还描述了基于分布式宠物突变模型和连续置换模型的各种复杂和贪心调度程序。

    Precoder Design for Physical Layer Multicasting
    99.
    发明申请
    Precoder Design for Physical Layer Multicasting 有权
    物理层组播的预编码器设计

    公开(公告)号：US20130170422A1

    公开(公告)日：2013-07-04

    申请号：US13621293

    申请日：2012-09-17

    申请人： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

    发明人： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

    IPC分类号： H04W4/06

    CPC分类号： H04W4/06

    摘要： A method for a transmit precoder for multicast communication over a downlink in a wireless network, including: initializing a transmit precoder, a channel estimate for each user in the wireless network; updating for each user a receive filter and a slack matrix; updating the transmit precoder by solving a second order cone routine solvable in closed form; determining if a predetermined convergence is met; and outputting the updated transmit precoder responsive to the convergence criteria.

    摘要翻译： 一种用于无线网络中的下行链路上的组播通信的发送预编码器的方法，包括：初始化发送预编码器，针对无线网络中的每个用户的信道估计; 为每个用户更新接收过滤器和松弛矩阵; 通过解决封闭形式可解的二阶锥体程序来更新传输预编码器; 确定是否满足预定的会聚; 以及响应于所述收敛标准输出所述更新的发送预编码器。