Richard A Kelsey

US Patent:

20040165532, Aug 26, 2004

Filed:

Jun 9, 2003

Appl. No.:

10/457205

Inventors:

Robert Poor - Cambridge MA, US
Zachary Smith - Somerville MA, US
Matteo Paris - Wellesley MA, US
Andrew Wheeler - Somerville MA, US
Richard Kelsey - Arlington MA, US

International Classification:

H04L012/26

US Classification:

370/238000, 370/252000

Abstract:

In a method for directing packets in a radio network, instances of a packet sent from an origin node to a destination in the radio network are received at each of a set of receiving nodes. At each of one or more of the set of receiving nodes, the received packet is processed by delaying re-transmission of the packet for the delay interval following receipt of the packet. Transmissions of the packet for other nodes are monitored during a delay interval. The node then determines whether to re-transmit the packet according to the monitoring of transmissions of the packet. The node can determine the delay interval from a probability distribution, which can depend, for example, on the progress of the packet to its destination or on signal or link characteristics for the received packet.

US Patent:

20050226169, Oct 13, 2005

Filed:

Feb 22, 2005

Appl. No.:

11/062515

Inventors:

Richard Kelsey - Arlington MA, US
Matteo Paris - Concord MA, US

International Classification:

H04L012/28

US Classification:

370254000, 370400000

Abstract:

A method for identifying nodes in a network includes selecting identification parameters for the nodes in the network. At some nodes in the network, identification information is maintained for a plurality of nodes based on messages received from neighboring nodes, and the identification information is monitored for a conflict between two or more nodes.

US Patent:

20050226195, Oct 13, 2005

Filed:

Feb 22, 2005

Appl. No.:

11/063163

Inventors:

Matteo Paris - Concord MA, US
Richard Kelsey - Arlington MA, US
Edward Groves Hill - Cambridge MA, US

International Classification:

G01R031/08
H04L001/00
H04Q007/24
H04L012/28
H04J003/14
H04J001/16
G08C015/00
H04L012/26
G06F011/00

US Classification:

370338000, 370241000, 370254000

Abstract:

A method for monitoring a network includes, transmitting and receiving messages at nodes of a network, generating monitoring data associated with the messages at the nodes, collecting the monitoring data from the nodes at a monitoring station in communication with the network, and associating a first portion of the collected monitoring data that corresponds to an event with a second portion of the collected monitoring data that corresponds to the event.

US Patent:

20050249185, Nov 10, 2005

Filed:

Feb 22, 2005

Appl. No.:

11/063288

Inventors:

Robert Poor - Cambridge MA, US
Matteo Paris - Concord MA, US
Andrew Wheeler - Boston MA, US
Richard Kelsey - Arlington MA, US

International Classification:

H04L012/56

US Classification:

370349000

Abstract:

In a method for directing packets in a radio network, a route of nodes from an origin to a destination is determined according to a routing algorithm. A packet is transmitted along the route. A failure of a first node to forward the packet along the route is detected. The packet is transmitted to the destination from a second node not on the route.

US Patent:

20050249186, Nov 10, 2005

Filed:

Feb 22, 2005

Appl. No.:

11/063290

Inventors:

Richard Kelsey - Arlington MA, US
Matteo Paris - Concord MA, US
Andrew Wheeler - Boston MA, US

International Classification:

H04L001/00

US Classification:

370349000

Abstract:

A method for directing packets in a radio network includes, at each node of the network, maintaining link data characterizing reliability of transmissions between neighboring nodes and that node based on received radio transmissions at that node, and distributing the link data to one or more of the neighboring nodes.

US Patent:

20050249215, Nov 10, 2005

Filed:

Feb 22, 2005

Appl. No.:

11/062514

Inventors:

Richard Kelsey - Arlington MA, US
Matteo Paris - Concord MA, US
Robert Poor - Cambridge MA, US

International Classification:

H04L012/56

US Classification:

370392000, 370238000

Abstract:

A wireless mesh network includes nodes of a first type and nodes of a second type. Packets are routed from nodes of the first type to nodes of the second type using a first routing protocol, and packet are routed from nodes of the second type to nodes of the first type using a second routing protocol that differs from the first routing protocol.

US Patent:

20210339396, Nov 4, 2021

Filed:

Jul 14, 2021

Appl. No.:

17/375447

Inventors:

Scott DENENBERG - Newton MA, US
Patrick SOBALVARRO - Harvard MA, US
Clara VU - Cambridge MA, US
Alberto MOEL - Cambridge MA, US
Richard A. KELSEY - Belmont MA, US

International Classification:

B25J 9/16
G06T 17/10
G01S 17/89
G01S 7/48
G01S 17/04
G01S 17/87

Abstract:

Safety systems in distributed factory workcells intercommunicate or communicate with a central controller so that when a person, robot or vehicle passes from one workcell or space into another on the same factory floor, the new workcell or space need not repeat the tasks of analysis and classification and can instead immediately integrate the new entrant into the existing workcell or space-monitoring schema. The workcell or space can also communicate attributes such as occlusions, unsafe areas, movement speed, and object trajectories, enabling rapid reaction by the monitoring system of the new workcell or space.

US Patent:

20200206928, Jul 2, 2020

Filed:

Feb 25, 2020

Appl. No.:

16/800427

Inventors:

- Waltham MA, US
Patrick Sobalvarro - Harvard MA, US
Clara Vu - Cambridge MA, US
Alberto Moel - Cambridge MA, US
Richard A. Kelsey - Belmont MA, US

International Classification:

B25J 9/16
G06T 17/10
G01S 17/89
G01S 7/48
G01S 17/87
G01S 17/04

Abstract:

Safety systems in distributed factory workcells intercommunicate or communicate with a central controller so that when a person, robot or vehicle passes from one workcell or space into another on the same factory floor, the new workcell or space need not repeat the tasks of analysis and classification and can instead immediately integrate the new entrant into the existing workcell or space-monitoring schema. The workcell or space can also communicate attributes such as occlusions, unsafe areas, movement speed, and object trajectories, enabling rapid reaction by the monitoring system of the new workcell or space.