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公开(公告)号：CA2425934A1
公开(公告)日：2000-01-14
申请号：CA2425934
申请日：1998-07-14
Applicant: IBM CANADA
Inventor： MCKAY DANNY N , BAKER MURRAY C , SINHA RUPAM
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公开(公告)号：CA2243218C
公开(公告)日：2002-04-02
申请号：CA2243218
申请日：1998-07-14
Applicant: IBM CANADA
Inventor： WONG DANIEL Y , JEAN NELSON , MCKAY DANNY N , SINHA RUPAM , BAKER MURRAY C
IPC: H04L47/765 , H04W80/02 , H04L29/06 , H04L12/18
Abstract: The invention provides a method for communication between a plurality of stations in a communication network using media access protocol, in which medium access is granted to stations obtaining a successful reservation of the medium and in which data transmission verification is performed by the protocol within the reservatio n. In the method a station sends a request message on the communication medium for a reservation of the medium to a recipient station in the network. The recipie nt station sends a reservation confirmation message back to the sending station which receives it and responds to the reservation confirmation message by sending an ordered sequence of data frames to the recipient station. After sending the ordered sequence of data frames the sending station sends an end of transmission message to the recipient station, which replies by sending back an end of transmission confirmation identifying the number of frames received in their original sequence. If the number is n ot correct remedial action can be taken by the sending station to resend missing data. Address conflict resolution is also provided by another aspect of the invention. The invention has embodiments which handle unicast and groupcasting transmissions.
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公开(公告)号：CA2243218A1
公开(公告)日：2000-01-14
申请号：CA2243218
申请日：1998-07-14
Applicant: IBM CANADA
Inventor： JEAN NELSON , SINHA RUPAM , WONG DANIEL Y , BAKER MURRAY C , MCKAY DANNY N
IPC: H04L47/765 , H04W80/02 , H04L29/06 , H04L12/18
Abstract: The invention provides a method for communication between a plurality of stations in a communication network using media access protocol, in which medium access is granted to stations obtaining a successful reservation of the medium and in which data transmission verification is performed by the protocol within the reservation. In the method a station sends a request message on the communication medium for a reservation of the medium to a recipient station in the network. The recipient station sends a reservation confirmation message back to the sending station which receives it and responds to the reservation confirmation message by sending an ordered sequence of data frames to the recipient station. After sending the ordered sequence of data frames the sending station sends an end of transmission message to the recipient station, which replies by sending back an end of transmission confirmation identifying the number of frames received in their original sequence. If the number is not correct remedial action can be taken by the sending station to resend missing data. Address conflict resolution is also provided by another aspect of the invention. The invention has embodiments which handle unicast and groupcasting transmissions.
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公开(公告)号：CA2242985A1
公开(公告)日：2000-01-14
申请号：CA2242985
申请日：1998-07-14
Applicant: IBM CANADA
Inventor： BAKER MURRAY C , SINHA RUPAM , MCKAY DANNY N
Abstract: One aspect of the invention provides a method of communication in a medium, for a communication network having a number of stations, using Medium Access Control protocol that incorporates quality of service capabilities wherein at least one of the stations is capable of generating a (repetitive) beacon for assigning priority levels for each priority station on the network, wherein a station, before transmitting information on the network, attempts to detect the presence of a beacon for the network, and if the presence of a beacon is not detected, adopts the status of a beacon and transmits a beacon message to other stations in the network. In another aspect of the invention interference is reduced in communication in a medium using carrier modulation, for a communication network having a plurality of stations, using access control protocol wherein at least one of the stations is capable of generating a control message (SOD) that can be transmitted to other stations on the network to change the method of modulation being used, wherein communication between stations in the network is being performed using a first modulation method, by initiating a change in the modulation method being used by sending a control message containing identification of a second modulation method to other stations to inform them of the second modulation method; allowing the other stations to change the modulation method used to the second modulation method. The control message further includes a direction to those other stations not changing modulation to the second modulation method to instruct them not to transmit using the first modulation method.
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Patent Agency Ranking
公开(公告)号：CA2137587A1
公开(公告)日：1996-06-09
申请号：CA2137587
申请日：1994-12-08
Applicant: IBM CANADA , IBM
Inventor： BAKER MURRAY C , BHATTACHARYA PARTHA P , CHEUNG ROGER Y M , KOBO ROBERTO M , KOLBE EDUARDO M , NAGHSHINEH MAHMOUD
Abstract: In communication systems which include high speed wired local area networks (LANs) and low speed wireless LANs, the bandwidth of the wireless LANs can be severely impacted. It has been found that many broadcast or multicast messages which are forwarded to the wireless LANs are not required as the mobile terminals which would receive the messages are not required to act on them. The present invention provides a means and method to filter out unneeded messages so that they do not impact the bandwidth of the wireless network. Each access point for each wireless LAN maintains a table of parameters for each associated mobile terminal in the connected wireless LAN. The parameters in that table are compared to the parameters in message frames received by the access point and only those messages having parameters found in the table are put on the wireless LAN. The level of filtering can be controlled by specifying which parameters are to be used for filtering messages. The tables at each access point are maintained current by moving table entries from access point to access point as mobile terminals move from wireless LAN to wireless LAN and by removing inactive table entries from the table when a predetermined interval of inactivity is encountered and a terminal is determined to be no longer in active contact with the access point.
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公开(公告)号：CA2425934C
公开(公告)日：2004-04-20
申请号：CA2425934
申请日：1998-07-14
Applicant: IBM CANADA
Inventor： MCKAY DANNY N , BAKER MURRAY C , SINHA RUPAM
Abstract: One aspect of the invention provides a method of communication in a medium, for a communication network having a number of stations, using Medium Access Contr ol protocol that incorporates quality of service capabilities wherein at least one of th e stations is capable of generating a (repetitive) beacon for assigning priority levels for each priority station on the network, wherein a station, before transmitting information on the network, attempts to detect the presence of a beacon for the network, and if the presence of a beacon is not detected, adopts the status of a beacon and transmits a beacon message to other stations in the network. In another aspect of the invention interference is reduced in communication in a medium using carrier modulation, for a communication network having a plurality of stations, usin g access control protocol wherein at least one of the stations is capable of generating a control message (SOD) that can be transmitted to other stations on the network to change the metho d of modulation being used, wherein communication between stations in the network is being performed using a first modulation method, by initiating a change in the modulation method bei ng used by sending a control message containing identification of a second modulation method to other stations toinform them of the second modulation method; allowing the o ther stations to change the modulation method used to the second modulation method. The control message further includes a direction to thaw other stations not charging modulation to the second modulation method to instruct them not to transmit using the first modulation method.
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公开(公告)号：CA2194023C
公开(公告)日：2002-04-02
申请号：CA2194023
申请日：1996-12-24
Applicant: IBM CANADA
Inventor： BAKER MURRAY C , CHAU ALAN C , TAGLIONE JOHN V , WALLAKER ARON D
Abstract: A method and means for information transmission over a medium for a wireless communication system comprising a network of stations capable of sending and receiving dat a transmissions over a number of communication channels is disclosed, the method includes sending a data transmission in a packet including a header and a data portion, the header includes identification (ID) of the network; identification of the next channel to be used in communications; an address; a channel busy count field; a network command.
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公开(公告)号：CA2194023A1
公开(公告)日：1998-06-24
申请号：CA2194023
申请日：1996-12-24
Applicant: IBM CANADA
Inventor： BAKER MURRAY C , CHAU ALAN C , TAGLIONE JOHN V , WALLAKER ARON D
Abstract: A method and means for information transmission over a medium for a wireless communication system comprising a network of stations capable of sending and receiving dat a transmissions over a number of communication channels is disclosed, the method includes sending a data transmission in a packet including a header and a data portion, the header includes identification (ID) of the network; identification of the next channel to be used in communications; an address; a channel busy count field; a network command.
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公开(公告)号：CA2129200A1
公开(公告)日：1996-01-30
申请号：CA2129200
申请日：1994-07-29
Applicant: IBM CANADA
Inventor： BAKER MURRAY C , CHEUNG ROGER Y M , PERKINS CHARLES E , REISSNER PETER E
Abstract: An internetworking node for providing internetworking services for mobile wireless nodes is disclosed. Each mobile wireless node is associated with at the most one internetworking node. Each mobile wireless node selects which internetworking node it will associate with. The internetworking node will then act for all wireless nodes associated to it in relaying messages between wireless nodes or between a wired lane and the wireless nodes. A tracking mechanism for such a system which maintains a table of all the internetworking nodes the wireless node has recently heard and deleting all such internetworking nodes which have not been heard recently is disclosed. A switching mechanism for such a system for determining when the wireless mobile node should switch its association from one internetworking node to another is also disclosed. The switching mechanism determines whether a particular internetworking node overheard by the mobile wireless node has been heard recently, and if not will associate with such an internetworking node. Otherwise the wireless node maintains its current association, with a particular internetworking node until a failure to communicate occurs or the said tracking mechanism deletes its reference to the said internetworking node.
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