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公开(公告)号：JPH1065669A
公开(公告)日：1998-03-06
申请号：JP14639697
申请日：1997-06-04
Applicant: IBM
Inventor： KERMANI PARVIZ , MCKAY DANNY N , NAGHSHINEH MAHMOUD , NOVAK FRANK PETER , REZVANI BABAK
IPC: H04L12/28 , H04L12/413
Abstract: PROBLEM TO BE SOLVED: To enable an adaptive access protocol by deciding the presence or absence of a hidden node. SOLUTION: If a source address (s) is not contained in a table after detection of a data frame, the address (s) is added to the table (1. 1). In any case, the status of the address (s) is written as 1 (1. 2) showing that the network nodes are included in the range of a node (n), and 0 sometimes shows that the network nodes are excluded out of the range of the node (n). If a destination address (d) of the frame is not contained in the table, the address (d) is added to the table (1. 3). In any case, the status of the address (d) is written as 0 (1. 4). Only the packet that is safely received is used to this algorithm in order to avoid such a case where a hidden node is identified when no ACK is transmitted due to a collision or a transmission error.
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公开(公告)号：CA2090709C
公开(公告)日：1998-09-29
申请号：CA2090709
申请日：1993-02-23
Applicant: IBM
Inventor： NOVAK FRANK PETER , KANNAN KRISHNAMURTHI , LEONTIADES KYRIAKOS , SHARMA VIKRAM
Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.
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公开(公告)号：DE69331204D1
公开(公告)日：2002-01-10
申请号：DE69331204
申请日：1993-03-23
Applicant: IBM
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Patent Agency Ranking
公开(公告)号：DE69332940D1
公开(公告)日：2003-06-12
申请号：DE69332940
申请日：1993-03-25
Applicant: IBM
Inventor： KANNAN KRISHNAMURTHI , LEONTIADES KYRIAKOS , NOVAK FRANK PETER , SHARMA VIKRAM
Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.
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公开(公告)号：GB2314242A
公开(公告)日：1997-12-17
申请号：GB9709868
申请日：1997-05-16
Applicant: IBM
Inventor： PARVIZ KERMANI , MCKAY DANNY M , MAHMOUD NAGHSHINEH , NOVAK FRANK PETER , BABAK REZVANI
IPC: H04L12/28 , H04L12/413
Abstract: A method of delievering data in a wireless communications network using a combination of collision sensing and collision avoiidance protocols. More precisely, if there are no hidden nodes detected in the network, a collision sensing protocol is used; however, if there are hidden nodes, then a collision avoidance protocol is used. This invention also deals with methods of determining the presence or absence of hidden nodes.
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公开(公告)号：DE69332940T2
公开(公告)日：2004-03-11
申请号：DE69332940
申请日：1993-03-25
Applicant: IBM
Inventor： KANNAN KRISHNAMURTHI , LEONTIADES KYRIAKOS , NOVAK FRANK PETER , SHARMA VIKRAM
Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.
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公开(公告)号：DE69331204T2
公开(公告)日：2002-08-08
申请号：DE69331204
申请日：1993-03-23
Applicant: IBM
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公开(公告)号：GB2314242B
公开(公告)日：2000-12-20
申请号：GB9709868
申请日：1997-05-16
Applicant: IBM
Inventor： PARVIZ KERMANI , MCKAY DANNY M , MAHMOUD NAGHSHINEH , NOVAK FRANK PETER , BABAK REZVANI
IPC: H04L12/28 , H04L12/413
Abstract: A method of delievering data in a wireless communications network using a combination of collision sensing and collision avoiidance protocols. More precisely, if there are no hidden nodes detected in the network, a collision sensing protocol is used; however, if there are hidden nodes, then a collision avoidance protocol is used. This invention also deals with methods of determining the presence or absence of hidden nodes.
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