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    BROADCAST/MULTICAST FILTERING BY THE BRIDGE-BASED ACCESS POINT
    1.
    发明专利
    BROADCAST/MULTICAST FILTERING BY THE BRIDGE-BASED ACCESS POINT 未知

    公开(公告)号：CA2137587C

    公开(公告)日：1999-03-23

    申请号：CA2137587

    申请日：1994-12-08

    Applicant: IBM CANADA ,  IBM

    Inventor： KOLBE EDUARDO MORENO ,  KOBO ROBERTO MITSOU ,  BAKER MURRAY CHARLES ,  BHATTACHARYA PARTHA PRATIM ,  CHEUNG ROGER YIU MING ,  NAGHSHINEH MAHMOUD

    IPC: H04L12/46 ,  H04W4/06 ,  H04W88/10 ,  H04Q7/24 ,  H04Q7/38

    Abstract: In communication systems which include high speed wired local area networks (LAN s) and low speed wireless LANs, the bandwidth of the wireless LANs can be severely impa cted. 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 m essages are not required to act on them. The present invention provides a means and meth od to filter out unneeded messages so that they do not impact the bandwidth of the wir eless 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 an d 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 us ed for filtering messages. The tables at each access point are maintained current by mo ving 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 predet ermined interval of inactivity is encountered and a terminal is determined to be no long er in active contact with the access point.

    Broadcast/Multicast Filtering by the Bridge-Based Access Point
    2.
    发明专利
    Broadcast/Multicast Filtering by the Bridge-Based Access Point 未知

    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

    IPC: H04L12/46 ,  H04W4/06 ,  H04W88/10

    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.

    SYSTEM AND METHOD FOR COMMON MULTI-DEVICE WEB BROWSING
    4.
    发明专利
    SYSTEM AND METHOD FOR COMMON MULTI-DEVICE WEB BROWSING 失效

    公开(公告)号：JP2001297029A

    公开(公告)日：2001-10-26

    申请号：JP2001048742

    申请日：2001-02-23

    Applicant: IBM

    Inventor： HAN RICHARD Y ,  KORPEOGLU IBRAHIM ,  NAGHSHINEH MAHMOUD ,  PERRET VERONIQUE

    IPC: G06F12/14 ,  G06F12/00 ,  G06F17/24 ,  G06F17/30 ,  G06F21/24 ,  H04L12/28

    Abstract: PROBLEM TO BE SOLVED: To enhance the functionality of a mobile network device by enabling both mobile and fixed type network devices to cooperate with each other. SOLUTION: According to the level of an access privilege, access to part of web contents which are displayed to a user is selectively provided and different part of the web contents is transmitted for display on a different user- specified device. A proxy entity is introduced between a web server and a user position. A document which is presented to a plurality of users has a policy file in which a plurality of privileged groups are defined. Each privileged group has the right to access a set having a different tag. Each user logs in a given group and makes the proxy discriminate all devices that the user has through service discovery.

    NETWORK ACCESS METHOD
    5.
    发明专利
    NETWORK ACCESS METHOD 失效

    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.

    EXTENSIONS TO DISTRIBUTED MAC PROTOCOLS WITH COLLISION AVOIDANCE USING RTS/CTS EXCHANGES
    9.
    发明专利
    EXTENSIONS TO DISTRIBUTED MAC PROTOCOLS WITH COLLISION AVOIDANCE USING RTS/CTS EXCHANGES 未知

    公开(公告)号：CA2218908C

    公开(公告)日：2000-02-22

    申请号：CA2218908

    申请日：1997-07-08

    Applicant: IBM

    Inventor： REZVANI BABAK ,  OLSEN CLAUS M ,  NAGHSHINEH MAHMOUD ,  MCKAY DANNY NEIL ,  HORTENSIUS PETER D ,  KERMANI PARVIZ

    IPC: H04L29/06 ,  H04L29/04

    Abstract: In a communications network having a plurality of stations and a shared common communications medium using a collision avoidance media access protocol for communication between the stations; in which medium access is granted to a pair of stations obtaining a successful reservation of the medium; the pair of stations comprising a requester station and a target station, the requester station comprises a primary station, and the target station comprises a secondary station; wherein the primary station coordinates communication to the secondary station; other stations in range of the primary station comprises observing stations; the improvement comprising a method of joining a reservation wherein the primary station invites a selected observing station to participate in communication with it; the selected observing station responding thereto where the primary joins the selected observing station as a secondary station within the reservation in replacement of previous secondary station in the reservation, the primary station thereafter sending data to the replacement secondary station.

    EXTENSIONS TO DISTRIBUTED MAC PROTOCOLS WITH COLLISION AVOIDANCE USING RTS/CTS EXCHANGES
    10.
    发明专利
    EXTENSIONS TO DISTRIBUTED MAC PROTOCOLS WITH COLLISION AVOIDANCE USING RTS/CTS EXCHANGES 未知

    公开(公告)号：CA2219046A1

    公开(公告)日：1998-01-09

    申请号：CA2219046

    申请日：1997-07-08

    Applicant: IBM

    Inventor： KERMANI PARVIZ ,  HORTENSIUS PETER D ,  REZVANI BABAK ,  OLSEN CLAUS M ,  NAGHSHINEH MAHMOUD ,  MCKAY DANNY NEIL

    IPC: H04L69/14 ,  H04L29/06

    Abstract: In a communication network having a plurality of stations and a shared co mmoncommunications medium using a collision avoidance me dia access protocol for communication between the stations; in which medium access is granted to a p air of stations obtaining a successful reservation of the medium; the pair of stati ons comprising a requester station and a target station, wherein multiple stations may requ est access to the medium to send data, a method of establishing a reservation between stat ionscomprising: the requesting stations sending Request- to-Send (RTS) control frames and the receiving stations responding as appropriate with Clear-to-Send (CTS) contro l frames; wherein a requesting node aborts the reservation if the medium becomes activ e between its RTS transmission and the corresponding CTS response of its target statio n; performing arbitration by stations receiving the RTS transmission as follows: if a rece iving station receives multiple Request-to-Send (RTS) control frames directed to the recei ving station during a contention period, the receiving station responds to the last RTS c ontrol frame received by transmitting Clear-to-Send (CTS) control frames; if the receivin g station receives multiple RTS control frames directed to different receiving station s during a contention period, the receiving station will respect the first RTS control frame received.

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