Kadangode K Ramakrishnan

US Patent:

6353596, Mar 5, 2002

Filed:

Apr 12, 1996

Appl. No.:

08/631869

Inventors:

Matthias Grossglauser - Balsthal, CH
Kadangode K. Ramakrishnan - Berkeley Heights NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 1256

US Classification:

370256, 370390, 370409

Abstract:

A system and method are provided for a scalable and efficient multipoint-to-multipoint multicast in packet and sub-packet based communications networks. The methodology of the invention incorporates an additional switching feature called cut-through forwarding, which enables the mapping of several incoming virtual channels into one or several outgoing virtual channels. The inventive methodology further provides a shared tree spanning all senders and receivers of the multicast group. Centrally initiated group setup as well as dynamic group membership changes are incorporated into the invention. An additional feature of the invention, designated âshort-cuttingâ, allows for the transmission of a packet to follow the shortest path along the shared tree. A methodology is also provided for achieving interoperability among switching nodes in a network which are capable of fully implementing the multipoint-to-multipoint multicast method of the invention and other switching nodes which lack that capability.

US Patent:

6438101, Aug 20, 2002

Filed:

May 27, 1998

Appl. No.:

09/085954

Inventors:

Lampros Kalampoukas - Eatontown NJ
Kadangode K. Ramakrishnan - Berkeley Heights NJ
Anujan Varma - Santa Cruz CA

Assignee:

ATT Corp. - New York NY
The Regents of the University of California - Oakland CA

International Classification:

G01R 3108

US Classification:

370229, 370235, 37039543, 370401

Abstract:

Congestion is controlled in an internetwork having at least two segments coupled by a router where at least one connection between communication devices passes through the router. Each connection is assumed to use a window-based flow control protocol between its source and destination. On receiving an acknowledgment from a connection in the router, where the acknowledgment contains a window size set by the destination, the router adaptively determines a second window size for the connection based on the routers average buffer occupancy and its instantaneous buffer occupancy. If the window size in the acknowledgment exceeds this second window size, the window size in the acknowledgment is overwritten to select the second window size. The router then forwards the acknowledgment to the source, thereby controlling the window size available to the source as a function of the congestion in the router.

US Patent:

6483912, Nov 19, 2002

Filed:

Aug 4, 1999

Appl. No.:

09/366207

Inventors:

William Todd Marshall - Chatham NJ
Partho Pratim Mishra - Summit NJ
Douglas M Nortz - Red Bank NJ
Kadangode K. Ramakrishnan - Berkeley Heights NJ

Assignee:

ATT Corp. - New York NY

International Classification:

H04M 700

US Classification:

379219, 37920201, 37922001

Abstract:

Network resources for a call between a calling party and a called party are allocated. The network resources for the call are reserved based on a reservation request. The network resources are reserved before any one network resource from the reserved network resources is committed. The reserved network resources for the call are committed when a called party indicates acceptance for the call.

US Patent:

6498797, Dec 24, 2002

Filed:

Nov 12, 1998

Appl. No.:

09/190125

Inventors:

Nikolaos Anerousis - New York NY
Raman Gopalakrishnan - San Jose CA
Alan Edward Kaplan - Morris Township, Morris County NJ
William Todd Marshall - Chatham NJ
Partho Pratim Mishra - Cupertino CA
Peter Z Onufryk - Flanders NJ
Kadangode K. Ramakrishnan - Berkeley Heights NJ
Cormac John Sreenan - Waterfall, IE

Assignee:

ATT Corp. - New York NY

International Classification:

H04J 312

US Classification:

370522, 370252, 370259, 370285, 370401, 379229, 379245

Abstract:

A method for performing communications over a network comprises receiving a user record for a first user, receiving a query from a second user with regard to the first user, and sending, to the second user, as a response to the query, a call-handling profile.

US Patent:

6556577, Apr 29, 2003

Filed:

May 31, 2001

Appl. No.:

09/867805

Inventors:

Gisli Hjalmtysson - Gillette NJ
Kadangode K. Ramakrishnan - Berkeley Heights NJ

Assignee:

ATT Corp. - New York NY

International Classification:

H04L 1228

US Classification:

370410

Abstract:

A method and system provide for a network using lightweight signaling for establishing connections. The method and system establish a best efforts connection between at least two terminals, on a hop-by-hop basis. Data can flow before and quality of service is established. The system enhances processing time for quality of service requirements and provides flexibility in establishing multicast connections.

US Patent:

6574335, Jun 3, 2003

Filed:

Dec 22, 1999

Appl. No.:

09/468902

Inventors:

William Todd Marshall - Chatham NJ
Partho Pratim Mishra - Millbrae CA
Douglas M Nortz - Red Bank NJ
Kadangode K. Ramakrishnan - Berkeley Heights NJ

Assignee:

ATT Corp. - New York NY

International Classification:

H04M 300

US Classification:

379386, 379418, 379372, 379 8812, 379 2702

Abstract:

A ring back signal for a call between a calling party and a called party can be simulated. A ring back message associated with the call is received. The calling party is associated with a first network. The called party is associated with a second network. A prestored ring back signal is selected from a set of prestored ring back signals based on the ring back message and/or a called number for the call. The selected prestored ring back signal is associated with the second network and is different from a second prestored ring back signal associated with the first network. The prestored ring back signal is sent to the calling party.

US Patent:

6577718, Jun 10, 2003

Filed:

Dec 22, 1999

Appl. No.:

09/469221

Inventors:

William Todd Marshall - Chatham NJ
Partho Pratim Mishra - Millbrae CA
Douglas M Nortz - Red Bank NJ
Kadangode K. Ramakrishnan - Berkeley Heights NJ

Assignee:

ATT Corp. - New York NY

International Classification:

H04M 1500

US Classification:

37911422, 37911401, 37911421, 37911423

Abstract:

A call is forwarded by connecting the call between an originating location and a forwarding location without connecting the call through a terminating location. The originating location is associated with a calling party. The terminating location is associated with a dialed number. The terminating location and the forwarding location is associated with the called party. A bill for the call is apportioned between the calling party and the called party. The bill portion for the calling party is a function of the originating location and the terminating location. The bill portion for the called party is a function of the terminating location and the forwarding location.

US Patent:

6615271, Sep 2, 2003

Filed:

Oct 19, 1999

Appl. No.:

09/421021

Inventors:

Anthony G. Lauck - Wellesley MA
Anna Charny - Sudbury MA
Kadangode K. Ramakrishnan - Maynard MA

Assignee:

Enterasys Networks, Inc. - Andover MA

International Classification:

G06F 1516

US Classification:

709232

Abstract:

A rate based, end to end flow control system is disclosed for a communications network. The disclosed rate based flow control system includes each source end station selecting its transmission rate from a set of permitted discrete transmission rates. The set of permitted discrete transmission rates is based on a logarithmic encoding. The disclosed rate based traffic control system further requires each source end station to send one end to end control cell every time period T. The time period T is also known by switches in the communications network and is used to periodically calculate an available allocation (âfair shareâ) of bandwidth at a switch for a given virtual circuit.