公开(公告)号：EP0813800A1

公开(公告)日：1997-12-29

申请号：EP96900961

申请日：1996-01-16

Applicant: IBM

Inventor： AHMADI HAMID ,  BAUCHOT FREDERIC JACQUES ,  BONNET ROSELYNE ,  KESSLER ILAN ,  KRISHNA ARVIND ,  LANNE FABIEN P ,  NAGHSHINEH MAHMOUD ,  SOLER CATHERINE ,  WETTERWALD MICHELLE MARIE

IPC: G06F13/00 ,  H04B7/26 ,  H04L12/56 ,  H04L29/06 ,  H04L29/12 ,  H04W8/26 ,  H04W40/24 ,  H04W40/26 ,  H04W40/36 ,  H04W80/04 ,  H04W92/02 ,  H04Q7/24

CPC classification number: H04W92/02 ,  H04L29/12009 ,  H04L45/02 ,  H04L61/00 ,  H04W8/26 ,  H04W40/248 ,  H04W40/26 ,  H04W40/36 ,  H04W80/04

Abstract: A communications network having a number of routers, a number of base stations and a number of mobile units maintains communications with the mobile units by assigning a unique address known to the routing entities of the network to each mobile unit. By including the mobile units unique address in topology updates of the network, the location of the mobile unit at any time is made known to all routers of the network. That is, once a mobile unit moves into a domain of a new access point and establishes a new link with the new access point, it uses the topology update mechanism of the network to make its new location known to all routers. Once a router of the network receives topology update information specific to the mobile unit's new location, it updates its routing table such that packets destined to the mobile unit are routed in a path which terminates at the mobile unit and contains its new access point.

公开(公告)号：JP2004135299A

公开(公告)日：2004-04-30

申请号：JP2003296498

申请日：2003-08-20

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： AHMADI HAMID ,  BAUCHOT FREDERIC J ,  BONNET ROSELYNE ,  KESSLER ILAN ,  KRISHNA ARVIND ,  LANNE FABIEN P ,  NAGHSHINEH MAHMOUD ,  SOLAR CATHERINE ,  WETTERWALD MICHELLE M

IPC: G06F13/00 ,  H04B7/26 ,  H04L12/56 ,  H04L29/06 ,  H04L29/12 ,  H04W8/26 ,  H04W40/24 ,  H04W40/26 ,  H04W40/36 ,  H04W80/04 ,  H04W92/02

CPC classification number: H04W92/02 ,  H04L29/12009 ,  H04L45/02 ,  H04L61/00 ,  H04W8/26 ,  H04W40/248 ,  H04W40/26 ,  H04W40/36 ,  H04W80/04

Abstract: PROBLEM TO BE SOLVED: To provide a system for maintaining routing information based on a unique address to efficiently communicate when a moving object moves between domains.
SOLUTION: A communication network having a number of routers, a number of base stations and a number of moving objects allocates the unique address which is known by a routing entity of the network to each moving object to maintain a communication with the moving object. The unique address of the moving object is contained in topology updating of the network, such that all routers can know the location of the moving object anytime. Namely, the moving object moves into a domain of a new access point, establishes a new link with the new access point and then notifies all the routers of its new location using a topology updating mechanism of the network. Each of the routers of the network updates its routing table to be routed within a path including the new access point.
COPYRIGHT: (C)2004,JPO

公开(公告)号：DE69426788T2

公开(公告)日：2001-08-02

申请号：DE69426788

申请日：1994-04-13

Applicant: IBM

Inventor： AHMADI HAMID ,  BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC JACQUES ,  KRISHNA ARVIND ,  LA MAIRE RICHARD ORVILLE ,  NATARAJAN KADATHUR S

IPC: H04J3/00 ,  H04B7/24 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56 ,  H04B7/204

Abstract: A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. The MAC protocol is based on a reservation scheme for user data traffic and a random access technique for control and signalling traffic. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is the outbound channel which is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is the inbound channel that is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is the control channel used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique. The base station estimates the number of actively transmitting remote stations utilizing feedback information from the remote stations. This estimate is broadcast to the remote stations as control indicia to control their transmission attempts in the C period, thus yielding high transmission efficiency.

公开(公告)号：CA2170786C

公开(公告)日：2001-07-03

申请号：CA2170786

申请日：1996-03-01

Applicant: IBM

Inventor： NAGHSHINEH MAHMOUD ,  SOLER CATHERINE ,  KRISHNA ARVIND ,  LANNE FABIEN P ,  AHMADI HAMID ,  BAUCHOT FREDERIC JACQUES ,  BONNET ROSELYNE ,  KESSLER ILAN ,  WETTERWALD MICHELLE MARIE

IPC: G06F13/00 ,  H04B7/26 ,  H04L12/56 ,  H04L29/06 ,  H04L29/12 ,  H04W8/26 ,  H04W40/24 ,  H04W40/26 ,  H04W40/36 ,  H04W80/04 ,  H04W92/02 ,  H04L12/46

Abstract: A communications network having a number of routers, a number of base statio ns and a number of mobile units maintains communications with the mobile units by assigning a unique address known to the routing entities of the network to e ach mobile unit. By including the mobile units unique address in topology update s of the network, the location of the mobile unit at any time is made known to all ro uters of the network. That is, once a mobile unit moves into a domain of a new access point and establishes a new link with the new access point, it uses the topology u pdate mechanism of the network to make its new location known to all routers. Once a router of the network receives topology update information specific to the m obile unit's new location, it updates its routing table such that packets destined to the mobile unit are routed in a path which terminates at the mobile unit and con tains its new access point.

公开(公告)号：DE69426788D1

公开(公告)日：2001-04-12

申请号：DE69426788

申请日：1994-04-13

Applicant: IBM

Inventor： AHMADI HAMID ,  BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC JACQUES ,  KRISHNA ARVIND ,  LA MAIRE RICHARD ORVILLE ,  NATARAJAN KADATHUR S

IPC: H04J3/00 ,  H04B7/24 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56 ,  H04B7/204

Abstract: A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. The MAC protocol is based on a reservation scheme for user data traffic and a random access technique for control and signalling traffic. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is the outbound channel which is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is the inbound channel that is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is the control channel used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique. The base station estimates the number of actively transmitting remote stations utilizing feedback information from the remote stations. This estimate is broadcast to the remote stations as control indicia to control their transmission attempts in the C period, thus yielding high transmission efficiency.

公开(公告)号：PL178086B1

公开(公告)日：2000-02-29

申请号：PL31667195

申请日：1995-09-08

Applicant: IBM

Inventor： BAKER MURRAY C ,  BHATTACHARYA PARTHA P ,  CHEN JEANE S C ,  CHEUNG ROGER Y M ,  KRISHNA ARVIND ,  REISSNER PETER E ,  NAGHSHINEH MAHMOUD

IPC: H04L12/28 ,  H04L12/56 ,  H04W40/24 ,  H04W40/28 ,  H04W40/36 ,  H04W92/02 ,  H04Q11/04

Abstract: A method of routing packets through a fixed source routing communications network from and to mobile units. With this invention an initial access point is determined when a communications session is established to or from a mobile unit through the network. Location information is updated each time the mobile unit moves out of the range of one access point and into the range of another access point of the network. When packets for the session are to be transmitted to the mobile unit from the wired network, the packets are forwarded from the initial access point to a current access point, which by definition is in the range of the mobile unit. When packets for the session are to be transmitted from the mobile unit and to the wired network, the access point intercepts these packets and routes them to their destination and/or initiates route discovery to those destinations. When packets are to be transmitted between mobiles at different access points. The packets are sent between the current access points and not through the home access points.

公开(公告)号：HU221581B

公开(公告)日：2002-11-28

申请号：HU9802235

申请日：1996-01-16

Applicant: IBM

Inventor： AHMADI HAMID ,  BAUCHOT FREDERIC JACQUES ,  BONNET ROSELYNE ,  KESSLER ILAN ,  KRISHNA ARVIND ,  LANNE FABIEN P ,  NAGHSHINEH MAHMOUD ,  SOLER CATHERINE ,  WETTERWALD MICHELLE MARIE

IPC: H04B7/26 ,  G06F13/00 ,  H04L12/56 ,  H04L29/06 ,  H04L29/12 ,  H04W8/26 ,  H04W40/24 ,  H04W40/26 ,  H04W40/36 ,  H04W80/04 ,  H04W92/02 ,  H04Q7/24

Abstract: A communications network having a number of routers, a number of base stations and a number of mobile units maintains communications with the mobile units by assigning a unique address known to the routing entities of the network to each mobile unit. By including the mobile units unique address in topology updates of the network, the location of the mobile unit at any time is made known to all routers of the network. That is, once a mobile unit moves into a domain of a new access point and establishes a new link with the new access point, it uses the topology update mechanism of the network to make its new location known to all routers. Once a router of the network receives topology update information specific to the mobile unit's new location, it updates its routing table such that packets destined to the mobile unit are routed in a path which terminates at the mobile unit and contains its new access point.

公开(公告)号：ES2154652T3

公开(公告)日：2001-04-16

申请号：ES94105696

申请日：1994-04-13

Applicant: IBM

Inventor： AHMADI HAMID ,  BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC JACQUES ,  KRISHNA ARVIND ,  LA MAIRE RICHARD ORVILLE ,  NATARAJAN KADATHUR S

IPC: H04J3/00 ,  H04B7/24 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56 ,  H04B7/204

Abstract: A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. The MAC protocol is based on a reservation scheme for user data traffic and a random access technique for control and signalling traffic. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is the outbound channel which is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is the inbound channel that is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is the control channel used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique. The base station estimates the number of actively transmitting remote stations utilizing feedback information from the remote stations. This estimate is broadcast to the remote stations as control indicia to control their transmission attempts in the C period, thus yielding high transmission efficiency.

公开(公告)号：PL316671A1

公开(公告)日：1997-02-03

申请号：PL31667195

申请日：1995-09-08

Applicant: IBM

Inventor： BAKER MURRAY CHARLES ,  BHATTACHARYA PARTHA PRATIM ,  CHEN JEANE SHU-CHUN ,  CHEUNG ROGER YIU MING ,  KRISHNA ARVIND ,  REISSNER PETER ERIC ,  NAGHSHINEH MAHMOUD

IPC: H04L12/28 ,  H04L12/56 ,  H04W40/24 ,  H04W40/28 ,  H04W40/36 ,  H04W92/02

Abstract: A method of routing packets through a fixed source routing communications network from and to mobile units. With this invention an initial access point is determined when a communications session is established to or from a mobile unit through the network. Location information is updated each time the mobile unit moves out of the range of one access point and into the range of another access point of the network. When packets for the session are to be transmitted to the mobile unit from the wired network, the packets are forwarded from the initial access point to a current access point, which by definition is in the range of the mobile unit. When packets for the session are to be transmitted from the mobile unit and to the wired network, the access point intercepts these packets and routes them to their destination and/or initiates route discovery to those destinations. When packets are to be transmitted between mobiles at different access points. The packets are sent between the current access points and not through the home access points.

公开(公告)号：CA2115211A1

公开(公告)日：1994-10-20

申请号：CA2115211

申请日：1994-02-08

Applicant: IBM

Inventor： AHMADI HAMID ,  BANTZ DAVID F ,  BAUCHOT FREDERIC ,  KRISHNA ARVIND ,  LAMAIRE RICHARD O ,  NATARAJAN KADATHUR S

IPC: H04J3/00 ,  H04B7/24 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56

Abstract: A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. The MAC protocol is based on a reservation scheme for user data traffic and a random access technique for control and signalling traffic. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is the outbound channel which is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is the inbound channel that is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is the control channel used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique. The base station estimates the number of actively transmitting remote stations utilizing feedback information from the remote stations. This estimate is broadcast to the remote stations as control indicia to control their transmission attempts in the C period, thus yielding high transmission efficiency.