公开(公告)号：BR9304798A

公开(公告)日：1994-05-31

申请号：BR9304798

申请日：1993-11-23

Applicant: IBM

Inventor： POZEFSKY DIANE ,  TURNER ROGER ,  SARKAR SOUMITRA ,  DOERINGER WILLIBALD ,  DYKEMAN DOUGLAS ,  EDWARDS ALLAN K

IPC: H04L12/56 ,  H04L12/18 ,  G06F13/00

Abstract: Disclosed are a method and a system for transmitting a message or data packet from a single sender (21) to a plurality, i.e. a group of receivers, usually called multicasting, within a conventional unicast transmission network, i.e. a network basically not equipped to handle such multicast transmissions, consisting of a plurality of subnetworks (22 - 24) The nodes or gateways (25 - 29) connecting the subnetworks maintain tables of multicast receiving stations (or groups of such) and the header of each message includes information defining the groups of the addressed multicast receiving stations.

公开(公告)号：DE60320818D1

公开(公告)日：2008-06-19

申请号：DE60320818

申请日：2003-03-28

Applicant: IBM

Inventor： BINDING CARL ,  DOLIVO FRANCOIS ,  DYKEMAN DOUGLAS ,  HILD STEFAN G ,  KARJOTH GUENTER ,  RUETSCHE ERICH

IPC: G06F17/30 ,  G01S5/02 ,  H04B1/16 ,  H04L12/28 ,  H04W24/00 ,  H04W28/18 ,  H04W64/00

Abstract: Methods and devices for determining a geographic location of an electronic device are introduced. A range of radio frequencies at the electronic device's location is scanned by a radio receiver ( 11 ). Characteristics (CH) of a geographically bound transmission system ( 3 ) within said scanned frequencies are identified by a control unit ( 21 ). A matching unit ( 5 ) matches these characteristics (CH) with stored characteristics (SCH) of geographically bound transmission systems of different geographical areas. The geographic location (LD) of said electronic device ( 1 ) is dependent on a result of said matching process.

公开(公告)号：DE69735821D1

公开(公告)日：2006-06-08

申请号：DE69735821

申请日：1997-06-25

Applicant: IBM

Inventor： DROZ PATRICK ,  DYKEMAN DOUGLAS

IPC: H04Q11/04 ,  H04L12/70

公开(公告)号：DE60026400D1

公开(公告)日：2006-05-04

申请号：DE60026400

申请日：2000-07-13

Applicant: IBM

Inventor： DYKEMAN DOUGLAS ,  OSBORNE MICHAEL ,  SCOTTON PAOLO ,  STOKES OLEN ,  BASSO CLAUDE ,  AUBRY MARIANNE ,  KHAC MINH-TRI DO

IPC: G06F9/44 ,  G06F12/08 ,  G06F13/00 ,  H04L45/02 ,  H04L49/111 ,  H04Q11/04

Abstract: Address management methods and apparatus are provided for a node serving as peer group leader for a peer group of nodes in one level of the hierarchy of a PNNI hierarchical network, whereby the peer group leader represents the peer group to one or more neighboring nodes in the next level up of the hierarchy. The peer group leader has a memory (2) for storing peer group topology data (4), comprising address data which is supplied to the peer group leader from nodes in the peer group and represents addresses for access by the network, and peer group leader topology data (5), comprising address data which is supplied to said neighboring nodes by the peer group leader and represents addresses accessible via the peer group. The address management method comprises: checking whether addresses represented by said address data are accessible via the peer group; notifying said neighboring nodes of changes in the accessibility of addresses so identified; and updating said peer group leader topology data (5) in accordance with said changes.

公开(公告)号：CA2105040A1

公开(公告)日：1994-05-28

申请号：CA2105040

申请日：1993-08-27

Applicant: IBM

Inventor： POZEFSKY DIANE ,  TURNER ROGER D ,  EDWARDS ALLAN K ,  SARKAR SOUMITRA ,  DOERINGER WILLIBALD ,  DYKEMAN DOUGLAS

IPC: H04L12/56 ,  H04L12/18 ,  H04L5/14 ,  H04L25/02 ,  H04L29/02

Abstract: Disclosed are a method and a system for transmitting a message or data packet from a single sender (21) to a plurality, i.e. a group of receivers, usually called multicasting, within a conventional unicast transmission network, i.e. a network basically not equipped to handle such multicast transmissions, consisting of a plurality of subnetworks (22 - 24) The nodes or gateways (25 - 29) connecting the subnetworks maintain tables of multicast receiving stations (or groups of such) and the header of each message includes information defining the groups of the addressed multicast receiving stations.