Browse Prior Art Database

Bridging Scheme for Wireless Local Area Network Roaming Capability

IP.com Disclosure Number: IPCOM000113544D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 76K

Publishing Venue

IBM

Related People

Dahl, SS: AUTHOR

Abstract

A method to eliminate complex wireless Local Area Network (LAN) bridges yet provide a multi-cell coverage with cell-to-cell session hand-offs is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Bridging Scheme for Wireless Local Area Network Roaming Capability

      A method to eliminate complex wireless Local Area Network (LAN)
bridges yet provide a multi-cell coverage with cell-to-cell session
hand-offs is disclosed.

      There is a single control unit with a variable number of modem
adaptor ports which connect via a high speed serial connection to the
remote Radio Wave (RF) modem devices.  The RF modems are
strategically located throughout a building to provide 100 percent RF
coverage.  Each RF modem device has an antenna (Fig. 1).

      Within the central control unit is a Host-Workstation Session
Router Mechanism (HSRM) which assigns the specific modem to the
mobile workstation (W/S).  Associated with the HSRM is the Cell
Control Table (CCT) which is segmented by cell.  For every cell there
is a segment within the CTT.  Within each cell segment is a log of
all active sessions within that cell and the key attributes with each
session.  The attributes are:
  o  Session IDentification (SID)
  o  W/S ID (WSID)
  o  Session signal-to-noise (S/N) ratio

For each cell there is a mobile signal detect register (MSDR) and
associated compare logic (Fig. 2).

      For each LAN frame that is passed between the Host and one of
the cells, the Cell Control Table is updated with the session's key
attributes (see table entries).  When a message is passed, the HSRM
will measure and record the S/N ratio and then compare this value
with the last S/...