Browse Prior Art Database

Fast Duplicate Address Detection During Registration with a Wireless LAN

IP.com Disclosure Number: IPCOM000123256D
Original Publication Date: 1998-Aug-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 3 page(s) / 95K

Publishing Venue

IBM

Related People

Bauchot, F: AUTHOR [+4]

Abstract

Introduction: Disclosed is a method to reduce the duplicate address detection process during a registration in a wireless LAN.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Fast Duplicate Address Detection During Registration with a Wireless
LAN

   Introduction:

   Disclosed is a method to reduce the duplicate address
detection process during a registration in a wireless LAN.

   Consider a multicellular radio communication local area
network based on an access point and some workstations, as the IBM
Wireless LAN product.  In such a network, the mobile workstations
have first to establish an association with the base station in
order to be recognized by to the network.  This procedure is called
the registration process.  If the workstation moves up to the point
where it looses contact with its base station, then it has to
register with a new base station.  This procedure is known as the
hand-off procedure.

   The purpose of the present paper is to show a registration
process faster and less complex than in the IBM Wireless LAN product
implementation.  Because registration process is part of hand-off
process, it must be as shorten as possible.

   Description:

   The registration is composed of following steps:
  o  the workstation sends a request to the base station
     (containing the MAC address),
  o  the base station checks that the remote station does not
     use the same MAC address as any previously registered
     workstation,
  o  the base station sends a return code indicating
     registration success or failure.

   The goal of "duplicate MAC address process detection" is
to guaranty that a MAC address is used by a single workstation in the
cell.  The problem is that during a short period of time, the base
station may still consider a workstation as registered even if the
latter has already left the cell (due to mobility or power off).  In
this case, if a workstation tries to register again to the same base
station, the base station should not consider it as a duplicate MAC
address case.  Thus, the duplicate MAC address discovery process
cannot only consist in checking the MAC address of registering
workstation versus registered addresses.  This process needs a way to
uniquely identify each workstation.
  1.  Previous implementation of duplicate MAC address
      detection: In the actual registration process, the
      duplicate MAC address test is done as follow:
      o  When the base station receives the registration request
         from the workstation, it checks that the MAC address
         specified in the request is not already used by
         registered workstations.
      o  if the workstation MAC address is not already used, the
         base sends a return code to the workstation indicating
that
         registration is successful, else, the base station
         sends a "heart-beat" ...