Browse Prior Art Database

Fair Access Method to a Wireless Data Channel

IP.com Disclosure Number: IPCOM000104047D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 4 page(s) / 110K

Publishing Venue

IBM

Related People

Simon, FY: AUTHOR

Abstract

The described procedure allows the fair access to a single wireless digital channel (i.e., Radio Frequency or infrared) medium by a data station within a wireless network.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 49% of the total text.

Fair Access Method to a Wireless Data Channel

      The described procedure allows the fair access to a single
wireless digital channel (i.e., Radio Frequency or infrared) medium
by a data station within a wireless network.

      In a wireless network, a station that transmits data to other
station(s) (within the accessible medium range) must do so when the
single wireless channel is free; that is, not actively involved in
sending or receiving data.  The availability of a wireless data
channel is affected by the number of stations in the network and the
transmission patterns of each station.  This often results in access
to the data channel being unevenly distributed.

      The procedure presented in this paper describes a method which
enables fair access to the wireless digital channel by all stations
present in the network at any particular point in time.

      This method is a significant modification of a similar method
used to provide fair access to the ISDN D-channel Basic Rate
interface in a wired environment.  The procedure specified in the
CCITT Recommendation I.430.

      Because of the simplistic nature of the procedure, the
implementation can be directed towards hardware instead of software
and thus, would reduce cost and decrease processing delay.

      It is assumed that:  the data exchanged on the wireless channel
within the network is bounded by starting and ending delimiters
(i.e., flags) to constitute a "packet"; a station can make a
distinction between received packets and the absence of meaningful
data (idle time between packets); in the wireless environment, all
stations with the boundary of the network received all data being
transmitted within the network; and, only one station transmits a
packet at any point in time and, also, there is an idle minimum time
between packets.

      The following parameters are associated with the procedure
described in this paper:

o   Idle Elapse Time (IET) - Represents the idle time value measured
    between the reception of the ending delimiter of one packet and
    the starting delimiter of the next packet being transmitted
    within the network.

o   Relative Station Priority (RSP) - Represents the relative
    priority given to a station for a given point in time.  The RSP
    may take the values "Normal" and "Low".  A station with a current
    RSP = "Normal" will have higher priority (to transmit a packet)
    than a station with a current RSP = "Low".

    -   RSP = "Normal" is obtained initially and when an Idle Elapsed
        Time = or > t2 (see below) is detected.

    -   RSP = "Low" is obtained when a packet has been transmitted.

o   Idle Elapse Time Threshold - 1 (t1) - Is the minimum channel idle
    time required by a "Normal" priority station before being
    permitted to transmit a packet.  t1 value is always smaller than
    t2 (t1<t2).

o   Idle Elapse Time Threshold - 2 (t2...