公开(公告)号：US20040131047A1

公开(公告)日：2004-07-08

申请号：US10248320

申请日：2003-01-08

Applicant: AT&T Corp.

Inventor： Farhad Barzegar ,  Irwin Gerszberg ,  Thomas W. Hill JR. ,  Scott Joseph Mollica

IPC: H04L012/28

CPC classification number: H04Q3/58 ,  H04L12/2883 ,  H04M3/2245 ,  H04Q2213/13034 ,  H04Q2213/13196 ,  H04Q2213/1329 ,  H04Q2213/13296 ,  H04Q2213/13381 ,  H04Q2213/13383

Abstract: The present invention is directed to a local network access architecture and method of providing local services that advantageously replaces portions of the physical hardwired local loop with a path that is software-defined.

Abstract translation: 本发明涉及一种本地网络接入体系结构和提供本地服务的方法，所述局部服务有利地用软件定义的路径替代物理硬连线本地环路的部分。

公开(公告)号：US20040081197A1

公开(公告)日：2004-04-29

申请号：US10065511

申请日：2002-10-25

Applicant: AT&T Corp.

Inventor： Chia J. Liu

IPC: H04L012/28

CPC classification number: H04L47/825 ,  H04L45/04 ,  H04L45/302 ,  H04L45/50 ,  H04L47/70 ,  H04L47/724 ,  H04L47/805

Abstract: The present invention is directed to a novel scalable packet-switched network routing method and system that utilizes modified traffic engineering mechanisms to prioritize tunnel traffic and non-tunnel traffic.

Abstract translation: 本发明涉及一种利用改进的流量工程机制来优化隧道业务和非隧道业务的新颖的可扩展分组交换网络路由方法和系统。

公开(公告)号：US20040078624A1

公开(公告)日：2004-04-22

申请号：US10330837

申请日：2002-12-27

Applicant: AT&T Corp.

Inventor： Nicholas Frank Maxemchuk ,  David McManamon ,  David Hilton Shur ,  Aleksandr Zelezniak

IPC: G06F011/00

CPC classification number: H04L12/1868 ,  G06F11/1443 ,  H04L12/1863 ,  H04L12/1886 ,  H04L43/0847

Abstract: A system and method are disclosed for the repair of IP multicast sessions. A repair server polls multiple transmit servers to accumulate as many of the packets missing from the multicast session as possible. A network includes a source of multicast packets in a multicast session and a plurality of multicast recipients in that session. A repair server in the network provides the packets it receives to the recipients. The repair server includes a missing packet detector. There is a plurality of retransmit servers in the network buffering portions of the packets they respectively receive during the session. The repair server maintains an ordered list of the retransmit servers that are most likely to have buffered copies of packets missing from the session. When the repair server detects that there are packets missing from the session it has received, it uses the ordered list to sequentially request the missing packets from respective ones of the plurality of retransmit servers.

公开(公告)号：US20040078592A1

公开(公告)日：2004-04-22

申请号：US10272581

申请日：2002-10-16

Applicant: AT & T Corp.

Inventor： Peter P. Fagone ,  David Jon Hendrie

IPC: H04L009/00

CPC classification number: H04L63/0272 ,  H04L63/14

Abstract: A honeypot architecture is disclosed with significant advantages over the prior art. Attacks are routed through a virtual private network to a honeypot system with limited controlled access to the public data networks.

Abstract translation: 公开了与现有技术相比具有显着优点的蜜罐结构。 攻击通过虚拟专用网络路由到具有受限访问公共数据网络的蜜罐系统。

公开(公告)号：US20030187917A1

公开(公告)日：2003-10-02

申请号：US10063341

申请日：2002-04-12

Applicant: AT&T Corp.

Inventor： Edith Cohen

IPC: G06F015/16

CPC classification number: H04L67/1095 ,  H04L67/02 ,  H04L67/2852 ,  H04L69/329

Abstract: In accordance with aspects of the invention, nulllow-levelnull caches can utilize source selection while non-authoritative sources can take advantage of rejuvenation to alleviate what the inventor refers to as nullage penaltynull and thereby reduce validation traffic.

Abstract translation: 根据本发明的方面，“低级”高速缓存可以利用源选择，而非权威来源可以利用复兴来减轻发明人所称的“年龄惩罚”，从而减少验证流量。

公开(公告)号：US20030174690A1

公开(公告)日：2003-09-18

申请号：US10256384

申请日：2002-09-27

Applicant: AT&T Corp.

Inventor： Mathilde Benveniste

IPC: H04J003/06

CPC classification number: H04W74/02 ,  H04W56/00 ,  H04W74/0808 ,  H04W84/12

Abstract: Overlapped wireless LAN cells in a medium have an equal chance at establishing a session on the medium. A first member station in the first cell transmits a timing packet containing a timestamp value, which is received at a second member station in the second cell. This synchronizes member stations in the first and second cells to interrupt transmissions at a global channel release instant corresponding to the timestamp value. The member stations in the first and second cells then have the opportunity to contend for access to the medium following the global channel release instant, using a slotted CSMA/CA access method. Each of the member stations in the first and second cells has a superframe clock that is synchronized based on the timestamp value, thereby establishing a periodic global channel release instant during each of a plurality of periodic superframes. The member stations can then periodically interrupt transmissions at the periodic global channel release instant to contend for the medium. The periodic global channel release instant occurs at intervals that are sufficiently close to meet delay and jitter restrictions for time-critical voice and video applications.

Abstract translation: 介质中重叠的无线LAN单元在介质上建立会话时具有相同的机会。 第一小区中的第一成员站发送包含在第二小区中的第二成员站处接收的时间戳值的定时分组。 这使得第一和第二小区中的成员站同步以对应于时间戳值的全局信道释放时刻的中断传输。 第一和第二个小区中的成员站随后可以使用时隙CSMA / CA访问方法在全球信道释放时刻之后争取访问媒体。 第一和第二小区中的每个成员站具有基于时间戳值同步的超帧时钟，从而在多个周期性超帧中的每个期间建立周期性全局信道释放时刻。 成员站然后可以周期性地中断在周期性全球信道释放时刻的传输以争取媒体。 周期性全局信道释放瞬间以足够接近的时间间隔发生，以满足时间关键语音和视频应用的延迟和抖动限制。

公开(公告)号：US20030174665A1

公开(公告)日：2003-09-18

申请号：US10256516

申请日：2002-09-27

Applicant: AT&T Corp.

Inventor： Mathilde Benveniste

IPC: H04B007/185

CPC classification number: H04W74/02 ,  H04W56/00 ,  H04W74/0808 ,  H04W84/12

Abstract: An access method for periodic contention-free sessions (PCFS) reduces interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations and an access point (AP) station. The access method for periodic contention-free sessions (PCFS) includes a fixed cycle time that reduces conflicts with PCFS from other cells. The PCFS from several cells are repeated in cycles of cycle period (CP), which is the contention-free period (CFP) of an access point times a factor that is a function of the number of overlapping cells. Periodic contention-free sessions (PCFSs) are generated, one from each overlapping cell. PCFS transmission attempts occur at the fixed specified time spacing following the start of the previous cycle. Each active AP sets a timer at CP and a PCFS is initiated when the timer expires. The timer is then reset to CP and this starts a new cycle. Contention transmissions are attempted by stations based on their assigned priority. If a channel is busy at the designated start time for transmitting a PCFS, the PCFS is shortened by the time lost. Interleaving PCFSs and CFSs reduces conflicts with CFSs from other cells. To lessen the contention between APs of different cells, each station's Network Allocation Vector (NAV) and Inter-BSS Network Allocation Vector (IBNAV) is updated by an increased value of the next CFS length, the increment being the inter-BSS contention period (IBCP). APs will attempt to access the channel during the IBCP only for transmitting a PCFS, while they will wait for the NAV and IBNAV expirations before attempting to transmit a CFS. Interleaving PCFSs and CFSs also enables maintaining quality of service (QoS).

Abstract translation: 用于周期性无争用会话（PCFS）的访问方法减少了在相同介质上竞争的重叠的第一和第二无线LAN单元之间的干扰。 每个小区包括相应的多个成员站和接入点（AP）站。 定期无竞争会话（PCFS）的访问方法包括一个固定的周期时间，可以减少与其他单元的PCFS冲突。 来自几个小区的PCFS以循环周期（CP）的周期重复，循环周期（CP）是接入点的无争用周期（CFP）乘以作为重叠小区数的函数的因子。 生成定期无竞争会话（PCFS），每个重叠的单元格之一。 在上一个周期开始之后，固定的指定时间间隔发生PCFS传输尝试。 每个活动AP在CP处设置定时器，并且当定时器到期时启动PCFS。 然后定时器复位到CP，并启动一个新的周期。 根据其分配的优先级，站点尝试竞争传输。 如果信道在指定的启动时间忙于发送PCFS，则PCFS将被丢失的时间缩短。 交叉PCFS和CFS减少与其他单元格的CFS的冲突。 为了减少不同小区的AP之间的争用，每个站的网络分配向量（NAV）和BSS间网络分配向量（IBNAV）通过增加下一个CFS长度的值来更新，该增量是BSS间争用周期（ IBCP）。 AP将尝试在IBCP期间访问该信道，仅用于发送PCFS，同时在尝试发送CFS之前等待NAV和IBNAV到期。 交互式PCFS和CFS还可以保持服务质量（QoS）。

公开(公告)号：US20030174664A1

公开(公告)日：2003-09-18

申请号：US10256309

申请日：2002-09-27

Applicant: AT&T Corp.

Inventor： Mathilde Benveniste

IPC: H04B007/185

CPC classification number: H04W24/04 ,  H04W56/00 ,  H04W74/02 ,  H04W74/0808 ,  H04W84/12

Abstract: An access point transmits a preemptive peg packet when it has no data to transmit in order to maintain the contiguity of its transmission timing position with respect to the timing position of other contention-free sessions (CFS) transmitted by other access points in an existing, periodic sequence. The cyclic prioritized multiple access (CPMA) method establishes the transmission timing position of contention-free sessions (CFS) between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations. If an access point has no traffic, it will transmit a short, preemptive pegging packet and reset its backoff timer. In this manner, no gaps longer than the distributed coordination function (DCF) Interframe Space (DIFS) are left idle. This prevents other stations from using DCF contention to seize the channel, until all access points have completed one contention-free session (CFS) per periodic cycle.

Abstract translation: 接入点当其没有数据要发送时，发送预抢占分组，以便保持其传输定时位置相对于其他接入点在现有的其他接入点中发送的其他无争用会话（CFS）的定时位置的邻接性， 周期性序列。 循环优先多重访问（CPMA）方法建立在相同媒体竞争的重叠的第一和第二无线LAN小区之间的无争用会话（CFS）的传输定时位置。 每个小区包括相应的多个成员站。 如果接入点没有流量，它将传输一个短暂的抢占分组，并重置其退避定时器。 以这种方式，没有比分布式协调功能（DCF）帧间间隔（DIFS）长的间隙空闲。 这样可以防止其他站点使用DCF争用占用信道，直到所有接入点每周期周期完成一个无争用会话（CFS）。

公开(公告)号：US20030172307A1

公开(公告)日：2003-09-11

申请号：US10317811

申请日：2002-12-12

Applicant: AT&T Corp.

Inventor： Paul Shala Henry ,  Hui Luo ,  Bruce Edwin McNair ,  Nemmara K. Shankaranarayanan

IPC: H04L009/00

CPC classification number: H04L63/061 ,  H04L61/2015 ,  H04L63/0869 ,  H04L63/1458

Abstract: A protocol framework for a Secure IP Access (SIA) method, and supporting components deployed on IP hosts and IP networks. Using this method, an IP host can establish a secure data channel within an IP network over an insecure shared link while requesting IP address and networking configuration parameters from the IP network. A system administrator can implement strong access control against various attacks that an edge IP network may have to face, such as a denial-of-service attack that exhausts assignable IP addresses. This is a lightweight, scalable, and backward-compatible solution that can improve security performance for public and corporate LANs having open access such as wireless access points and Ethernet jacks.

Abstract translation: 用于安全IP接入（SIA）方法的协议框架，以及部署在IP主机和IP网络上的支持组件。 使用这种方法，IP主机可以通过不安全的共享链路在IP网络内建立安全数据通道，同时从IP网络请求IP地址和网络配置参数。 系统管理员可以对边缘IP网络可能必须面对的各种攻击实施强大的访问控制，例如耗尽可分配IP地址的拒绝服务攻击。 这是一个轻量级的，可扩展的和向后兼容的解决方案，可以提高具有开放访问权限的公共和公司LAN（如无线接入点和以太网插孔）的安全性能。

公开(公告)号：US20030170020A1

公开(公告)日：2003-09-11

申请号：US10396151

申请日：2003-03-25

Applicant: AT&T Corp.

Inventor： Sid Chaudhuri ,  Bruce Gilbert Cortez ,  Simon S. Zelingher

IPC: G02F001/00

CPC classification number: H04Q11/0062 ,  H04B10/032 ,  H04J14/0283 ,  H04J14/0284 ,  H04J14/0295 ,  H04Q2011/0075 ,  H04Q2011/0081 ,  H04Q2011/0086

Abstract: A method and system provide capacity-efficient restoration within an optical fiber communication system. The system includes a plurality of nodes each interconnected by optical fibers. Each optical fiber connection between nodes includes at least three channel groups with different priority levels for restoration switching in response to a connection failure. The system maintains and restores full-capacity communication services by switching at least a portion of the channel groups from a first optical fiber connection to a second optical fiber connection system based on the priority levels assigned to the channel groups. Service reliability is effectively maintained without incurring additional costs for dedicated spare optical fiber equipment by improving idle capacity utilization.