Browse Prior Art Database

Method for Frequency Allocation in Mobile Telecommunications Systems

IP.com Disclosure Number: IPCOM000105389D
Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Doganata, YN: AUTHOR [+2]

Abstract

Consider a mobile telecommunication system where a base station exists in a cell, and mobile stations enter and leave the cell (become active and inactive). Let there be a two-way communication between the base station and the mobile stations. Usually, mobile stations have to register (sign-on) upon their entry to the cell. This is normally done through a registration procedure whereby a mobile station sends a registration message to the base station. All registering mobile stations compete to access the base station using a multiple access protocol. Consider an environment where there exists a high traffic rate of mobile stations that need to register, relative to the processing time of a registration. Furthermore, let there be a stringent requirement to register within a bounded time.

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

Method for Frequency Allocation in Mobile Telecommunications Systems

      Consider a mobile telecommunication system where a base station
exists in a cell, and mobile stations enter and leave  the cell
(become active and inactive).  Let there be a two-way communication
between the base station and the mobile stations.  Usually, mobile
stations have to register (sign-on) upon their entry to the cell.
This is normally done through a registration procedure whereby a
mobile station sends a registration message to the base station.  All
registering mobile stations compete to access the base station using
a multiple access protocol.  Consider an environment where there
exists a high traffic rate of mobile stations that need to register,
relative to the processing time of a registration.  Furthermore, let
there be a stringent requirement to register within a bounded time.
The large number of mobile stations that need to register
simultaneously, under a time constraint, and the use of a multiple
access protocol, lead to instability, media bandwidth reduction, and
possible thrashing.  One solution is to assign a multitude of
frequency bands to mobile stations, one band per mobile station, in
order to reduce the number of simultaneous registration per frequency
band.  Thus, a shorter registration time is achievable.  Alternative
solutions include the use of a higher capacity base station, or
having multiple base stations per cell.  Both solutions are
expensive.

A description of this method follows.

1.  The base station broadcasts message "Please Register" on a
    multitude of frequencies f(1), f(2), ..., f(n), using only one
    frequency at any given time.  A possible implementation is to use
    frequency f(i) for a duration t(i), i=1,2,...,n, visiting all
    frequencies in a round-robin manner.

2.  A mobile station, upon entering the cell or becoming active,
    list...